Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/inode.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Goal-directed block allocation by Stephen Tweedie | |
16 | * (sct@redhat.com), 1993, 1998 | |
17 | * Big-endian to little-endian byte-swapping/bitmaps by | |
18 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
19 | * 64-bit file support on 64-bit platforms by Jakub Jelinek | |
20 | * (jj@sunsite.ms.mff.cuni.cz) | |
21 | * | |
617ba13b | 22 | * Assorted race fixes, rewrite of ext4_get_block() by Al Viro, 2000 |
ac27a0ec DK |
23 | */ |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/fs.h> | |
27 | #include <linux/time.h> | |
dab291af | 28 | #include <linux/jbd2.h> |
ac27a0ec DK |
29 | #include <linux/highuid.h> |
30 | #include <linux/pagemap.h> | |
31 | #include <linux/quotaops.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/buffer_head.h> | |
34 | #include <linux/writeback.h> | |
64769240 | 35 | #include <linux/pagevec.h> |
ac27a0ec | 36 | #include <linux/mpage.h> |
e83c1397 | 37 | #include <linux/namei.h> |
ac27a0ec DK |
38 | #include <linux/uio.h> |
39 | #include <linux/bio.h> | |
4c0425ff | 40 | #include <linux/workqueue.h> |
744692dc | 41 | #include <linux/kernel.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
9bffad1e | 43 | |
3dcf5451 | 44 | #include "ext4_jbd2.h" |
ac27a0ec DK |
45 | #include "xattr.h" |
46 | #include "acl.h" | |
d2a17637 | 47 | #include "ext4_extents.h" |
ac27a0ec | 48 | |
9bffad1e TT |
49 | #include <trace/events/ext4.h> |
50 | ||
a1d6cc56 AK |
51 | #define MPAGE_DA_EXTENT_TAIL 0x01 |
52 | ||
678aaf48 JK |
53 | static inline int ext4_begin_ordered_truncate(struct inode *inode, |
54 | loff_t new_size) | |
55 | { | |
7ff9c073 | 56 | trace_ext4_begin_ordered_truncate(inode, new_size); |
7f5aa215 JK |
57 | return jbd2_journal_begin_ordered_truncate( |
58 | EXT4_SB(inode->i_sb)->s_journal, | |
59 | &EXT4_I(inode)->jinode, | |
60 | new_size); | |
678aaf48 JK |
61 | } |
62 | ||
64769240 | 63 | static void ext4_invalidatepage(struct page *page, unsigned long offset); |
cb20d518 TT |
64 | static int noalloc_get_block_write(struct inode *inode, sector_t iblock, |
65 | struct buffer_head *bh_result, int create); | |
66 | static int ext4_set_bh_endio(struct buffer_head *bh, struct inode *inode); | |
67 | static void ext4_end_io_buffer_write(struct buffer_head *bh, int uptodate); | |
68 | static int __ext4_journalled_writepage(struct page *page, unsigned int len); | |
69 | static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh); | |
64769240 | 70 | |
ac27a0ec DK |
71 | /* |
72 | * Test whether an inode is a fast symlink. | |
73 | */ | |
617ba13b | 74 | static int ext4_inode_is_fast_symlink(struct inode *inode) |
ac27a0ec | 75 | { |
617ba13b | 76 | int ea_blocks = EXT4_I(inode)->i_file_acl ? |
ac27a0ec DK |
77 | (inode->i_sb->s_blocksize >> 9) : 0; |
78 | ||
79 | return (S_ISLNK(inode->i_mode) && inode->i_blocks - ea_blocks == 0); | |
80 | } | |
81 | ||
ac27a0ec DK |
82 | /* |
83 | * Work out how many blocks we need to proceed with the next chunk of a | |
84 | * truncate transaction. | |
85 | */ | |
86 | static unsigned long blocks_for_truncate(struct inode *inode) | |
87 | { | |
725d26d3 | 88 | ext4_lblk_t needed; |
ac27a0ec DK |
89 | |
90 | needed = inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9); | |
91 | ||
92 | /* Give ourselves just enough room to cope with inodes in which | |
93 | * i_blocks is corrupt: we've seen disk corruptions in the past | |
94 | * which resulted in random data in an inode which looked enough | |
617ba13b | 95 | * like a regular file for ext4 to try to delete it. Things |
ac27a0ec DK |
96 | * will go a bit crazy if that happens, but at least we should |
97 | * try not to panic the whole kernel. */ | |
98 | if (needed < 2) | |
99 | needed = 2; | |
100 | ||
101 | /* But we need to bound the transaction so we don't overflow the | |
102 | * journal. */ | |
617ba13b MC |
103 | if (needed > EXT4_MAX_TRANS_DATA) |
104 | needed = EXT4_MAX_TRANS_DATA; | |
ac27a0ec | 105 | |
617ba13b | 106 | return EXT4_DATA_TRANS_BLOCKS(inode->i_sb) + needed; |
ac27a0ec DK |
107 | } |
108 | ||
109 | /* | |
110 | * Truncate transactions can be complex and absolutely huge. So we need to | |
111 | * be able to restart the transaction at a conventient checkpoint to make | |
112 | * sure we don't overflow the journal. | |
113 | * | |
114 | * start_transaction gets us a new handle for a truncate transaction, | |
115 | * and extend_transaction tries to extend the existing one a bit. If | |
116 | * extend fails, we need to propagate the failure up and restart the | |
117 | * transaction in the top-level truncate loop. --sct | |
118 | */ | |
119 | static handle_t *start_transaction(struct inode *inode) | |
120 | { | |
121 | handle_t *result; | |
122 | ||
617ba13b | 123 | result = ext4_journal_start(inode, blocks_for_truncate(inode)); |
ac27a0ec DK |
124 | if (!IS_ERR(result)) |
125 | return result; | |
126 | ||
617ba13b | 127 | ext4_std_error(inode->i_sb, PTR_ERR(result)); |
ac27a0ec DK |
128 | return result; |
129 | } | |
130 | ||
131 | /* | |
132 | * Try to extend this transaction for the purposes of truncation. | |
133 | * | |
134 | * Returns 0 if we managed to create more room. If we can't create more | |
135 | * room, and the transaction must be restarted we return 1. | |
136 | */ | |
137 | static int try_to_extend_transaction(handle_t *handle, struct inode *inode) | |
138 | { | |
0390131b FM |
139 | if (!ext4_handle_valid(handle)) |
140 | return 0; | |
141 | if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1)) | |
ac27a0ec | 142 | return 0; |
617ba13b | 143 | if (!ext4_journal_extend(handle, blocks_for_truncate(inode))) |
ac27a0ec DK |
144 | return 0; |
145 | return 1; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Restart the transaction associated with *handle. This does a commit, | |
150 | * so before we call here everything must be consistently dirtied against | |
151 | * this transaction. | |
152 | */ | |
fa5d1113 | 153 | int ext4_truncate_restart_trans(handle_t *handle, struct inode *inode, |
487caeef | 154 | int nblocks) |
ac27a0ec | 155 | { |
487caeef JK |
156 | int ret; |
157 | ||
158 | /* | |
e35fd660 | 159 | * Drop i_data_sem to avoid deadlock with ext4_map_blocks. At this |
487caeef JK |
160 | * moment, get_block can be called only for blocks inside i_size since |
161 | * page cache has been already dropped and writes are blocked by | |
162 | * i_mutex. So we can safely drop the i_data_sem here. | |
163 | */ | |
0390131b | 164 | BUG_ON(EXT4_JOURNAL(inode) == NULL); |
ac27a0ec | 165 | jbd_debug(2, "restarting handle %p\n", handle); |
487caeef JK |
166 | up_write(&EXT4_I(inode)->i_data_sem); |
167 | ret = ext4_journal_restart(handle, blocks_for_truncate(inode)); | |
168 | down_write(&EXT4_I(inode)->i_data_sem); | |
fa5d1113 | 169 | ext4_discard_preallocations(inode); |
487caeef JK |
170 | |
171 | return ret; | |
ac27a0ec DK |
172 | } |
173 | ||
174 | /* | |
175 | * Called at the last iput() if i_nlink is zero. | |
176 | */ | |
0930fcc1 | 177 | void ext4_evict_inode(struct inode *inode) |
ac27a0ec DK |
178 | { |
179 | handle_t *handle; | |
bc965ab3 | 180 | int err; |
ac27a0ec | 181 | |
7ff9c073 | 182 | trace_ext4_evict_inode(inode); |
0930fcc1 AV |
183 | if (inode->i_nlink) { |
184 | truncate_inode_pages(&inode->i_data, 0); | |
185 | goto no_delete; | |
186 | } | |
187 | ||
907f4554 | 188 | if (!is_bad_inode(inode)) |
871a2931 | 189 | dquot_initialize(inode); |
907f4554 | 190 | |
678aaf48 JK |
191 | if (ext4_should_order_data(inode)) |
192 | ext4_begin_ordered_truncate(inode, 0); | |
ac27a0ec DK |
193 | truncate_inode_pages(&inode->i_data, 0); |
194 | ||
195 | if (is_bad_inode(inode)) | |
196 | goto no_delete; | |
197 | ||
bc965ab3 | 198 | handle = ext4_journal_start(inode, blocks_for_truncate(inode)+3); |
ac27a0ec | 199 | if (IS_ERR(handle)) { |
bc965ab3 | 200 | ext4_std_error(inode->i_sb, PTR_ERR(handle)); |
ac27a0ec DK |
201 | /* |
202 | * If we're going to skip the normal cleanup, we still need to | |
203 | * make sure that the in-core orphan linked list is properly | |
204 | * cleaned up. | |
205 | */ | |
617ba13b | 206 | ext4_orphan_del(NULL, inode); |
ac27a0ec DK |
207 | goto no_delete; |
208 | } | |
209 | ||
210 | if (IS_SYNC(inode)) | |
0390131b | 211 | ext4_handle_sync(handle); |
ac27a0ec | 212 | inode->i_size = 0; |
bc965ab3 TT |
213 | err = ext4_mark_inode_dirty(handle, inode); |
214 | if (err) { | |
12062ddd | 215 | ext4_warning(inode->i_sb, |
bc965ab3 TT |
216 | "couldn't mark inode dirty (err %d)", err); |
217 | goto stop_handle; | |
218 | } | |
ac27a0ec | 219 | if (inode->i_blocks) |
617ba13b | 220 | ext4_truncate(inode); |
bc965ab3 TT |
221 | |
222 | /* | |
223 | * ext4_ext_truncate() doesn't reserve any slop when it | |
224 | * restarts journal transactions; therefore there may not be | |
225 | * enough credits left in the handle to remove the inode from | |
226 | * the orphan list and set the dtime field. | |
227 | */ | |
0390131b | 228 | if (!ext4_handle_has_enough_credits(handle, 3)) { |
bc965ab3 TT |
229 | err = ext4_journal_extend(handle, 3); |
230 | if (err > 0) | |
231 | err = ext4_journal_restart(handle, 3); | |
232 | if (err != 0) { | |
12062ddd | 233 | ext4_warning(inode->i_sb, |
bc965ab3 TT |
234 | "couldn't extend journal (err %d)", err); |
235 | stop_handle: | |
236 | ext4_journal_stop(handle); | |
45388219 | 237 | ext4_orphan_del(NULL, inode); |
bc965ab3 TT |
238 | goto no_delete; |
239 | } | |
240 | } | |
241 | ||
ac27a0ec | 242 | /* |
617ba13b | 243 | * Kill off the orphan record which ext4_truncate created. |
ac27a0ec | 244 | * AKPM: I think this can be inside the above `if'. |
617ba13b | 245 | * Note that ext4_orphan_del() has to be able to cope with the |
ac27a0ec | 246 | * deletion of a non-existent orphan - this is because we don't |
617ba13b | 247 | * know if ext4_truncate() actually created an orphan record. |
ac27a0ec DK |
248 | * (Well, we could do this if we need to, but heck - it works) |
249 | */ | |
617ba13b MC |
250 | ext4_orphan_del(handle, inode); |
251 | EXT4_I(inode)->i_dtime = get_seconds(); | |
ac27a0ec DK |
252 | |
253 | /* | |
254 | * One subtle ordering requirement: if anything has gone wrong | |
255 | * (transaction abort, IO errors, whatever), then we can still | |
256 | * do these next steps (the fs will already have been marked as | |
257 | * having errors), but we can't free the inode if the mark_dirty | |
258 | * fails. | |
259 | */ | |
617ba13b | 260 | if (ext4_mark_inode_dirty(handle, inode)) |
ac27a0ec | 261 | /* If that failed, just do the required in-core inode clear. */ |
0930fcc1 | 262 | ext4_clear_inode(inode); |
ac27a0ec | 263 | else |
617ba13b MC |
264 | ext4_free_inode(handle, inode); |
265 | ext4_journal_stop(handle); | |
ac27a0ec DK |
266 | return; |
267 | no_delete: | |
0930fcc1 | 268 | ext4_clear_inode(inode); /* We must guarantee clearing of inode... */ |
ac27a0ec DK |
269 | } |
270 | ||
271 | typedef struct { | |
272 | __le32 *p; | |
273 | __le32 key; | |
274 | struct buffer_head *bh; | |
275 | } Indirect; | |
276 | ||
277 | static inline void add_chain(Indirect *p, struct buffer_head *bh, __le32 *v) | |
278 | { | |
279 | p->key = *(p->p = v); | |
280 | p->bh = bh; | |
281 | } | |
282 | ||
ac27a0ec | 283 | /** |
617ba13b | 284 | * ext4_block_to_path - parse the block number into array of offsets |
ac27a0ec DK |
285 | * @inode: inode in question (we are only interested in its superblock) |
286 | * @i_block: block number to be parsed | |
287 | * @offsets: array to store the offsets in | |
8c55e204 DK |
288 | * @boundary: set this non-zero if the referred-to block is likely to be |
289 | * followed (on disk) by an indirect block. | |
ac27a0ec | 290 | * |
617ba13b | 291 | * To store the locations of file's data ext4 uses a data structure common |
ac27a0ec DK |
292 | * for UNIX filesystems - tree of pointers anchored in the inode, with |
293 | * data blocks at leaves and indirect blocks in intermediate nodes. | |
294 | * This function translates the block number into path in that tree - | |
295 | * return value is the path length and @offsets[n] is the offset of | |
296 | * pointer to (n+1)th node in the nth one. If @block is out of range | |
297 | * (negative or too large) warning is printed and zero returned. | |
298 | * | |
299 | * Note: function doesn't find node addresses, so no IO is needed. All | |
300 | * we need to know is the capacity of indirect blocks (taken from the | |
301 | * inode->i_sb). | |
302 | */ | |
303 | ||
304 | /* | |
305 | * Portability note: the last comparison (check that we fit into triple | |
306 | * indirect block) is spelled differently, because otherwise on an | |
307 | * architecture with 32-bit longs and 8Kb pages we might get into trouble | |
308 | * if our filesystem had 8Kb blocks. We might use long long, but that would | |
309 | * kill us on x86. Oh, well, at least the sign propagation does not matter - | |
310 | * i_block would have to be negative in the very beginning, so we would not | |
311 | * get there at all. | |
312 | */ | |
313 | ||
617ba13b | 314 | static int ext4_block_to_path(struct inode *inode, |
de9a55b8 TT |
315 | ext4_lblk_t i_block, |
316 | ext4_lblk_t offsets[4], int *boundary) | |
ac27a0ec | 317 | { |
617ba13b MC |
318 | int ptrs = EXT4_ADDR_PER_BLOCK(inode->i_sb); |
319 | int ptrs_bits = EXT4_ADDR_PER_BLOCK_BITS(inode->i_sb); | |
320 | const long direct_blocks = EXT4_NDIR_BLOCKS, | |
ac27a0ec DK |
321 | indirect_blocks = ptrs, |
322 | double_blocks = (1 << (ptrs_bits * 2)); | |
323 | int n = 0; | |
324 | int final = 0; | |
325 | ||
c333e073 | 326 | if (i_block < direct_blocks) { |
ac27a0ec DK |
327 | offsets[n++] = i_block; |
328 | final = direct_blocks; | |
af5bc92d | 329 | } else if ((i_block -= direct_blocks) < indirect_blocks) { |
617ba13b | 330 | offsets[n++] = EXT4_IND_BLOCK; |
ac27a0ec DK |
331 | offsets[n++] = i_block; |
332 | final = ptrs; | |
333 | } else if ((i_block -= indirect_blocks) < double_blocks) { | |
617ba13b | 334 | offsets[n++] = EXT4_DIND_BLOCK; |
ac27a0ec DK |
335 | offsets[n++] = i_block >> ptrs_bits; |
336 | offsets[n++] = i_block & (ptrs - 1); | |
337 | final = ptrs; | |
338 | } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) { | |
617ba13b | 339 | offsets[n++] = EXT4_TIND_BLOCK; |
ac27a0ec DK |
340 | offsets[n++] = i_block >> (ptrs_bits * 2); |
341 | offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1); | |
342 | offsets[n++] = i_block & (ptrs - 1); | |
343 | final = ptrs; | |
344 | } else { | |
12062ddd | 345 | ext4_warning(inode->i_sb, "block %lu > max in inode %lu", |
de9a55b8 TT |
346 | i_block + direct_blocks + |
347 | indirect_blocks + double_blocks, inode->i_ino); | |
ac27a0ec DK |
348 | } |
349 | if (boundary) | |
350 | *boundary = final - 1 - (i_block & (ptrs - 1)); | |
351 | return n; | |
352 | } | |
353 | ||
c398eda0 TT |
354 | static int __ext4_check_blockref(const char *function, unsigned int line, |
355 | struct inode *inode, | |
6fd058f7 TT |
356 | __le32 *p, unsigned int max) |
357 | { | |
1c13d5c0 | 358 | struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; |
f73953c0 | 359 | __le32 *bref = p; |
6fd058f7 TT |
360 | unsigned int blk; |
361 | ||
fe2c8191 | 362 | while (bref < p+max) { |
6fd058f7 | 363 | blk = le32_to_cpu(*bref++); |
de9a55b8 TT |
364 | if (blk && |
365 | unlikely(!ext4_data_block_valid(EXT4_SB(inode->i_sb), | |
6fd058f7 | 366 | blk, 1))) { |
1c13d5c0 | 367 | es->s_last_error_block = cpu_to_le64(blk); |
c398eda0 TT |
368 | ext4_error_inode(inode, function, line, blk, |
369 | "invalid block"); | |
de9a55b8 TT |
370 | return -EIO; |
371 | } | |
372 | } | |
373 | return 0; | |
fe2c8191 TN |
374 | } |
375 | ||
376 | ||
377 | #define ext4_check_indirect_blockref(inode, bh) \ | |
c398eda0 TT |
378 | __ext4_check_blockref(__func__, __LINE__, inode, \ |
379 | (__le32 *)(bh)->b_data, \ | |
fe2c8191 TN |
380 | EXT4_ADDR_PER_BLOCK((inode)->i_sb)) |
381 | ||
382 | #define ext4_check_inode_blockref(inode) \ | |
c398eda0 TT |
383 | __ext4_check_blockref(__func__, __LINE__, inode, \ |
384 | EXT4_I(inode)->i_data, \ | |
fe2c8191 TN |
385 | EXT4_NDIR_BLOCKS) |
386 | ||
ac27a0ec | 387 | /** |
617ba13b | 388 | * ext4_get_branch - read the chain of indirect blocks leading to data |
ac27a0ec DK |
389 | * @inode: inode in question |
390 | * @depth: depth of the chain (1 - direct pointer, etc.) | |
391 | * @offsets: offsets of pointers in inode/indirect blocks | |
392 | * @chain: place to store the result | |
393 | * @err: here we store the error value | |
394 | * | |
395 | * Function fills the array of triples <key, p, bh> and returns %NULL | |
396 | * if everything went OK or the pointer to the last filled triple | |
397 | * (incomplete one) otherwise. Upon the return chain[i].key contains | |
398 | * the number of (i+1)-th block in the chain (as it is stored in memory, | |
399 | * i.e. little-endian 32-bit), chain[i].p contains the address of that | |
400 | * number (it points into struct inode for i==0 and into the bh->b_data | |
401 | * for i>0) and chain[i].bh points to the buffer_head of i-th indirect | |
402 | * block for i>0 and NULL for i==0. In other words, it holds the block | |
403 | * numbers of the chain, addresses they were taken from (and where we can | |
404 | * verify that chain did not change) and buffer_heads hosting these | |
405 | * numbers. | |
406 | * | |
407 | * Function stops when it stumbles upon zero pointer (absent block) | |
408 | * (pointer to last triple returned, *@err == 0) | |
409 | * or when it gets an IO error reading an indirect block | |
410 | * (ditto, *@err == -EIO) | |
ac27a0ec DK |
411 | * or when it reads all @depth-1 indirect blocks successfully and finds |
412 | * the whole chain, all way to the data (returns %NULL, *err == 0). | |
c278bfec AK |
413 | * |
414 | * Need to be called with | |
0e855ac8 | 415 | * down_read(&EXT4_I(inode)->i_data_sem) |
ac27a0ec | 416 | */ |
725d26d3 AK |
417 | static Indirect *ext4_get_branch(struct inode *inode, int depth, |
418 | ext4_lblk_t *offsets, | |
ac27a0ec DK |
419 | Indirect chain[4], int *err) |
420 | { | |
421 | struct super_block *sb = inode->i_sb; | |
422 | Indirect *p = chain; | |
423 | struct buffer_head *bh; | |
424 | ||
425 | *err = 0; | |
426 | /* i_data is not going away, no lock needed */ | |
af5bc92d | 427 | add_chain(chain, NULL, EXT4_I(inode)->i_data + *offsets); |
ac27a0ec DK |
428 | if (!p->key) |
429 | goto no_block; | |
430 | while (--depth) { | |
fe2c8191 TN |
431 | bh = sb_getblk(sb, le32_to_cpu(p->key)); |
432 | if (unlikely(!bh)) | |
ac27a0ec | 433 | goto failure; |
de9a55b8 | 434 | |
fe2c8191 TN |
435 | if (!bh_uptodate_or_lock(bh)) { |
436 | if (bh_submit_read(bh) < 0) { | |
437 | put_bh(bh); | |
438 | goto failure; | |
439 | } | |
440 | /* validate block references */ | |
441 | if (ext4_check_indirect_blockref(inode, bh)) { | |
442 | put_bh(bh); | |
443 | goto failure; | |
444 | } | |
445 | } | |
de9a55b8 | 446 | |
af5bc92d | 447 | add_chain(++p, bh, (__le32 *)bh->b_data + *++offsets); |
ac27a0ec DK |
448 | /* Reader: end */ |
449 | if (!p->key) | |
450 | goto no_block; | |
451 | } | |
452 | return NULL; | |
453 | ||
ac27a0ec DK |
454 | failure: |
455 | *err = -EIO; | |
456 | no_block: | |
457 | return p; | |
458 | } | |
459 | ||
460 | /** | |
617ba13b | 461 | * ext4_find_near - find a place for allocation with sufficient locality |
ac27a0ec DK |
462 | * @inode: owner |
463 | * @ind: descriptor of indirect block. | |
464 | * | |
1cc8dcf5 | 465 | * This function returns the preferred place for block allocation. |
ac27a0ec DK |
466 | * It is used when heuristic for sequential allocation fails. |
467 | * Rules are: | |
468 | * + if there is a block to the left of our position - allocate near it. | |
469 | * + if pointer will live in indirect block - allocate near that block. | |
470 | * + if pointer will live in inode - allocate in the same | |
471 | * cylinder group. | |
472 | * | |
473 | * In the latter case we colour the starting block by the callers PID to | |
474 | * prevent it from clashing with concurrent allocations for a different inode | |
475 | * in the same block group. The PID is used here so that functionally related | |
476 | * files will be close-by on-disk. | |
477 | * | |
478 | * Caller must make sure that @ind is valid and will stay that way. | |
479 | */ | |
617ba13b | 480 | static ext4_fsblk_t ext4_find_near(struct inode *inode, Indirect *ind) |
ac27a0ec | 481 | { |
617ba13b | 482 | struct ext4_inode_info *ei = EXT4_I(inode); |
af5bc92d | 483 | __le32 *start = ind->bh ? (__le32 *) ind->bh->b_data : ei->i_data; |
ac27a0ec | 484 | __le32 *p; |
617ba13b | 485 | ext4_fsblk_t bg_start; |
74d3487f | 486 | ext4_fsblk_t last_block; |
617ba13b | 487 | ext4_grpblk_t colour; |
a4912123 TT |
488 | ext4_group_t block_group; |
489 | int flex_size = ext4_flex_bg_size(EXT4_SB(inode->i_sb)); | |
ac27a0ec DK |
490 | |
491 | /* Try to find previous block */ | |
492 | for (p = ind->p - 1; p >= start; p--) { | |
493 | if (*p) | |
494 | return le32_to_cpu(*p); | |
495 | } | |
496 | ||
497 | /* No such thing, so let's try location of indirect block */ | |
498 | if (ind->bh) | |
499 | return ind->bh->b_blocknr; | |
500 | ||
501 | /* | |
502 | * It is going to be referred to from the inode itself? OK, just put it | |
503 | * into the same cylinder group then. | |
504 | */ | |
a4912123 TT |
505 | block_group = ei->i_block_group; |
506 | if (flex_size >= EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME) { | |
507 | block_group &= ~(flex_size-1); | |
508 | if (S_ISREG(inode->i_mode)) | |
509 | block_group++; | |
510 | } | |
511 | bg_start = ext4_group_first_block_no(inode->i_sb, block_group); | |
74d3487f VC |
512 | last_block = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es) - 1; |
513 | ||
a4912123 TT |
514 | /* |
515 | * If we are doing delayed allocation, we don't need take | |
516 | * colour into account. | |
517 | */ | |
518 | if (test_opt(inode->i_sb, DELALLOC)) | |
519 | return bg_start; | |
520 | ||
74d3487f VC |
521 | if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block) |
522 | colour = (current->pid % 16) * | |
617ba13b | 523 | (EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16); |
74d3487f VC |
524 | else |
525 | colour = (current->pid % 16) * ((last_block - bg_start) / 16); | |
ac27a0ec DK |
526 | return bg_start + colour; |
527 | } | |
528 | ||
529 | /** | |
1cc8dcf5 | 530 | * ext4_find_goal - find a preferred place for allocation. |
ac27a0ec DK |
531 | * @inode: owner |
532 | * @block: block we want | |
ac27a0ec | 533 | * @partial: pointer to the last triple within a chain |
ac27a0ec | 534 | * |
1cc8dcf5 | 535 | * Normally this function find the preferred place for block allocation, |
fb01bfda | 536 | * returns it. |
fb0a387d ES |
537 | * Because this is only used for non-extent files, we limit the block nr |
538 | * to 32 bits. | |
ac27a0ec | 539 | */ |
725d26d3 | 540 | static ext4_fsblk_t ext4_find_goal(struct inode *inode, ext4_lblk_t block, |
de9a55b8 | 541 | Indirect *partial) |
ac27a0ec | 542 | { |
fb0a387d ES |
543 | ext4_fsblk_t goal; |
544 | ||
ac27a0ec | 545 | /* |
c2ea3fde | 546 | * XXX need to get goal block from mballoc's data structures |
ac27a0ec | 547 | */ |
ac27a0ec | 548 | |
fb0a387d ES |
549 | goal = ext4_find_near(inode, partial); |
550 | goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; | |
551 | return goal; | |
ac27a0ec DK |
552 | } |
553 | ||
554 | /** | |
617ba13b | 555 | * ext4_blks_to_allocate: Look up the block map and count the number |
ac27a0ec DK |
556 | * of direct blocks need to be allocated for the given branch. |
557 | * | |
558 | * @branch: chain of indirect blocks | |
559 | * @k: number of blocks need for indirect blocks | |
560 | * @blks: number of data blocks to be mapped. | |
561 | * @blocks_to_boundary: the offset in the indirect block | |
562 | * | |
563 | * return the total number of blocks to be allocate, including the | |
564 | * direct and indirect blocks. | |
565 | */ | |
498e5f24 | 566 | static int ext4_blks_to_allocate(Indirect *branch, int k, unsigned int blks, |
de9a55b8 | 567 | int blocks_to_boundary) |
ac27a0ec | 568 | { |
498e5f24 | 569 | unsigned int count = 0; |
ac27a0ec DK |
570 | |
571 | /* | |
572 | * Simple case, [t,d]Indirect block(s) has not allocated yet | |
573 | * then it's clear blocks on that path have not allocated | |
574 | */ | |
575 | if (k > 0) { | |
576 | /* right now we don't handle cross boundary allocation */ | |
577 | if (blks < blocks_to_boundary + 1) | |
578 | count += blks; | |
579 | else | |
580 | count += blocks_to_boundary + 1; | |
581 | return count; | |
582 | } | |
583 | ||
584 | count++; | |
585 | while (count < blks && count <= blocks_to_boundary && | |
586 | le32_to_cpu(*(branch[0].p + count)) == 0) { | |
587 | count++; | |
588 | } | |
589 | return count; | |
590 | } | |
591 | ||
592 | /** | |
617ba13b | 593 | * ext4_alloc_blocks: multiple allocate blocks needed for a branch |
ac27a0ec DK |
594 | * @indirect_blks: the number of blocks need to allocate for indirect |
595 | * blocks | |
596 | * | |
597 | * @new_blocks: on return it will store the new block numbers for | |
598 | * the indirect blocks(if needed) and the first direct block, | |
599 | * @blks: on return it will store the total number of allocated | |
600 | * direct blocks | |
601 | */ | |
617ba13b | 602 | static int ext4_alloc_blocks(handle_t *handle, struct inode *inode, |
de9a55b8 TT |
603 | ext4_lblk_t iblock, ext4_fsblk_t goal, |
604 | int indirect_blks, int blks, | |
605 | ext4_fsblk_t new_blocks[4], int *err) | |
ac27a0ec | 606 | { |
815a1130 | 607 | struct ext4_allocation_request ar; |
ac27a0ec | 608 | int target, i; |
7061eba7 | 609 | unsigned long count = 0, blk_allocated = 0; |
ac27a0ec | 610 | int index = 0; |
617ba13b | 611 | ext4_fsblk_t current_block = 0; |
ac27a0ec DK |
612 | int ret = 0; |
613 | ||
614 | /* | |
615 | * Here we try to allocate the requested multiple blocks at once, | |
616 | * on a best-effort basis. | |
617 | * To build a branch, we should allocate blocks for | |
618 | * the indirect blocks(if not allocated yet), and at least | |
619 | * the first direct block of this branch. That's the | |
620 | * minimum number of blocks need to allocate(required) | |
621 | */ | |
7061eba7 AK |
622 | /* first we try to allocate the indirect blocks */ |
623 | target = indirect_blks; | |
624 | while (target > 0) { | |
ac27a0ec DK |
625 | count = target; |
626 | /* allocating blocks for indirect blocks and direct blocks */ | |
7061eba7 AK |
627 | current_block = ext4_new_meta_blocks(handle, inode, |
628 | goal, &count, err); | |
ac27a0ec DK |
629 | if (*err) |
630 | goto failed_out; | |
631 | ||
273df556 FM |
632 | if (unlikely(current_block + count > EXT4_MAX_BLOCK_FILE_PHYS)) { |
633 | EXT4_ERROR_INODE(inode, | |
634 | "current_block %llu + count %lu > %d!", | |
635 | current_block, count, | |
636 | EXT4_MAX_BLOCK_FILE_PHYS); | |
637 | *err = -EIO; | |
638 | goto failed_out; | |
639 | } | |
fb0a387d | 640 | |
ac27a0ec DK |
641 | target -= count; |
642 | /* allocate blocks for indirect blocks */ | |
643 | while (index < indirect_blks && count) { | |
644 | new_blocks[index++] = current_block++; | |
645 | count--; | |
646 | } | |
7061eba7 AK |
647 | if (count > 0) { |
648 | /* | |
649 | * save the new block number | |
650 | * for the first direct block | |
651 | */ | |
652 | new_blocks[index] = current_block; | |
653 | printk(KERN_INFO "%s returned more blocks than " | |
654 | "requested\n", __func__); | |
655 | WARN_ON(1); | |
ac27a0ec | 656 | break; |
7061eba7 | 657 | } |
ac27a0ec DK |
658 | } |
659 | ||
7061eba7 AK |
660 | target = blks - count ; |
661 | blk_allocated = count; | |
662 | if (!target) | |
663 | goto allocated; | |
664 | /* Now allocate data blocks */ | |
815a1130 TT |
665 | memset(&ar, 0, sizeof(ar)); |
666 | ar.inode = inode; | |
667 | ar.goal = goal; | |
668 | ar.len = target; | |
669 | ar.logical = iblock; | |
670 | if (S_ISREG(inode->i_mode)) | |
671 | /* enable in-core preallocation only for regular files */ | |
672 | ar.flags = EXT4_MB_HINT_DATA; | |
673 | ||
674 | current_block = ext4_mb_new_blocks(handle, &ar, err); | |
273df556 FM |
675 | if (unlikely(current_block + ar.len > EXT4_MAX_BLOCK_FILE_PHYS)) { |
676 | EXT4_ERROR_INODE(inode, | |
677 | "current_block %llu + ar.len %d > %d!", | |
678 | current_block, ar.len, | |
679 | EXT4_MAX_BLOCK_FILE_PHYS); | |
680 | *err = -EIO; | |
681 | goto failed_out; | |
682 | } | |
815a1130 | 683 | |
7061eba7 AK |
684 | if (*err && (target == blks)) { |
685 | /* | |
686 | * if the allocation failed and we didn't allocate | |
687 | * any blocks before | |
688 | */ | |
689 | goto failed_out; | |
690 | } | |
691 | if (!*err) { | |
692 | if (target == blks) { | |
de9a55b8 TT |
693 | /* |
694 | * save the new block number | |
695 | * for the first direct block | |
696 | */ | |
7061eba7 AK |
697 | new_blocks[index] = current_block; |
698 | } | |
815a1130 | 699 | blk_allocated += ar.len; |
7061eba7 AK |
700 | } |
701 | allocated: | |
ac27a0ec | 702 | /* total number of blocks allocated for direct blocks */ |
7061eba7 | 703 | ret = blk_allocated; |
ac27a0ec DK |
704 | *err = 0; |
705 | return ret; | |
706 | failed_out: | |
af5bc92d | 707 | for (i = 0; i < index; i++) |
e6362609 | 708 | ext4_free_blocks(handle, inode, 0, new_blocks[i], 1, 0); |
ac27a0ec DK |
709 | return ret; |
710 | } | |
711 | ||
712 | /** | |
617ba13b | 713 | * ext4_alloc_branch - allocate and set up a chain of blocks. |
ac27a0ec DK |
714 | * @inode: owner |
715 | * @indirect_blks: number of allocated indirect blocks | |
716 | * @blks: number of allocated direct blocks | |
717 | * @offsets: offsets (in the blocks) to store the pointers to next. | |
718 | * @branch: place to store the chain in. | |
719 | * | |
720 | * This function allocates blocks, zeroes out all but the last one, | |
721 | * links them into chain and (if we are synchronous) writes them to disk. | |
722 | * In other words, it prepares a branch that can be spliced onto the | |
723 | * inode. It stores the information about that chain in the branch[], in | |
617ba13b | 724 | * the same format as ext4_get_branch() would do. We are calling it after |
ac27a0ec DK |
725 | * we had read the existing part of chain and partial points to the last |
726 | * triple of that (one with zero ->key). Upon the exit we have the same | |
617ba13b | 727 | * picture as after the successful ext4_get_block(), except that in one |
ac27a0ec DK |
728 | * place chain is disconnected - *branch->p is still zero (we did not |
729 | * set the last link), but branch->key contains the number that should | |
730 | * be placed into *branch->p to fill that gap. | |
731 | * | |
732 | * If allocation fails we free all blocks we've allocated (and forget | |
733 | * their buffer_heads) and return the error value the from failed | |
617ba13b | 734 | * ext4_alloc_block() (normally -ENOSPC). Otherwise we set the chain |
ac27a0ec DK |
735 | * as described above and return 0. |
736 | */ | |
617ba13b | 737 | static int ext4_alloc_branch(handle_t *handle, struct inode *inode, |
de9a55b8 TT |
738 | ext4_lblk_t iblock, int indirect_blks, |
739 | int *blks, ext4_fsblk_t goal, | |
740 | ext4_lblk_t *offsets, Indirect *branch) | |
ac27a0ec DK |
741 | { |
742 | int blocksize = inode->i_sb->s_blocksize; | |
743 | int i, n = 0; | |
744 | int err = 0; | |
745 | struct buffer_head *bh; | |
746 | int num; | |
617ba13b MC |
747 | ext4_fsblk_t new_blocks[4]; |
748 | ext4_fsblk_t current_block; | |
ac27a0ec | 749 | |
7061eba7 | 750 | num = ext4_alloc_blocks(handle, inode, iblock, goal, indirect_blks, |
ac27a0ec DK |
751 | *blks, new_blocks, &err); |
752 | if (err) | |
753 | return err; | |
754 | ||
755 | branch[0].key = cpu_to_le32(new_blocks[0]); | |
756 | /* | |
757 | * metadata blocks and data blocks are allocated. | |
758 | */ | |
759 | for (n = 1; n <= indirect_blks; n++) { | |
760 | /* | |
761 | * Get buffer_head for parent block, zero it out | |
762 | * and set the pointer to new one, then send | |
763 | * parent to disk. | |
764 | */ | |
765 | bh = sb_getblk(inode->i_sb, new_blocks[n-1]); | |
87783690 NK |
766 | if (unlikely(!bh)) { |
767 | err = -EIO; | |
768 | goto failed; | |
769 | } | |
770 | ||
ac27a0ec DK |
771 | branch[n].bh = bh; |
772 | lock_buffer(bh); | |
773 | BUFFER_TRACE(bh, "call get_create_access"); | |
617ba13b | 774 | err = ext4_journal_get_create_access(handle, bh); |
ac27a0ec | 775 | if (err) { |
6487a9d3 CW |
776 | /* Don't brelse(bh) here; it's done in |
777 | * ext4_journal_forget() below */ | |
ac27a0ec | 778 | unlock_buffer(bh); |
ac27a0ec DK |
779 | goto failed; |
780 | } | |
781 | ||
782 | memset(bh->b_data, 0, blocksize); | |
783 | branch[n].p = (__le32 *) bh->b_data + offsets[n]; | |
784 | branch[n].key = cpu_to_le32(new_blocks[n]); | |
785 | *branch[n].p = branch[n].key; | |
af5bc92d | 786 | if (n == indirect_blks) { |
ac27a0ec DK |
787 | current_block = new_blocks[n]; |
788 | /* | |
789 | * End of chain, update the last new metablock of | |
790 | * the chain to point to the new allocated | |
791 | * data blocks numbers | |
792 | */ | |
de9a55b8 | 793 | for (i = 1; i < num; i++) |
ac27a0ec DK |
794 | *(branch[n].p + i) = cpu_to_le32(++current_block); |
795 | } | |
796 | BUFFER_TRACE(bh, "marking uptodate"); | |
797 | set_buffer_uptodate(bh); | |
798 | unlock_buffer(bh); | |
799 | ||
0390131b FM |
800 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
801 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
ac27a0ec DK |
802 | if (err) |
803 | goto failed; | |
804 | } | |
805 | *blks = num; | |
806 | return err; | |
807 | failed: | |
808 | /* Allocation failed, free what we already allocated */ | |
e6362609 | 809 | ext4_free_blocks(handle, inode, 0, new_blocks[0], 1, 0); |
ac27a0ec | 810 | for (i = 1; i <= n ; i++) { |
60e6679e | 811 | /* |
e6362609 TT |
812 | * branch[i].bh is newly allocated, so there is no |
813 | * need to revoke the block, which is why we don't | |
814 | * need to set EXT4_FREE_BLOCKS_METADATA. | |
b7e57e7c | 815 | */ |
e6362609 TT |
816 | ext4_free_blocks(handle, inode, 0, new_blocks[i], 1, |
817 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 818 | } |
e6362609 TT |
819 | for (i = n+1; i < indirect_blks; i++) |
820 | ext4_free_blocks(handle, inode, 0, new_blocks[i], 1, 0); | |
ac27a0ec | 821 | |
e6362609 | 822 | ext4_free_blocks(handle, inode, 0, new_blocks[i], num, 0); |
ac27a0ec DK |
823 | |
824 | return err; | |
825 | } | |
826 | ||
827 | /** | |
617ba13b | 828 | * ext4_splice_branch - splice the allocated branch onto inode. |
ac27a0ec DK |
829 | * @inode: owner |
830 | * @block: (logical) number of block we are adding | |
831 | * @chain: chain of indirect blocks (with a missing link - see | |
617ba13b | 832 | * ext4_alloc_branch) |
ac27a0ec DK |
833 | * @where: location of missing link |
834 | * @num: number of indirect blocks we are adding | |
835 | * @blks: number of direct blocks we are adding | |
836 | * | |
837 | * This function fills the missing link and does all housekeeping needed in | |
838 | * inode (->i_blocks, etc.). In case of success we end up with the full | |
839 | * chain to new block and return 0. | |
840 | */ | |
617ba13b | 841 | static int ext4_splice_branch(handle_t *handle, struct inode *inode, |
de9a55b8 TT |
842 | ext4_lblk_t block, Indirect *where, int num, |
843 | int blks) | |
ac27a0ec DK |
844 | { |
845 | int i; | |
846 | int err = 0; | |
617ba13b | 847 | ext4_fsblk_t current_block; |
ac27a0ec | 848 | |
ac27a0ec DK |
849 | /* |
850 | * If we're splicing into a [td]indirect block (as opposed to the | |
851 | * inode) then we need to get write access to the [td]indirect block | |
852 | * before the splice. | |
853 | */ | |
854 | if (where->bh) { | |
855 | BUFFER_TRACE(where->bh, "get_write_access"); | |
617ba13b | 856 | err = ext4_journal_get_write_access(handle, where->bh); |
ac27a0ec DK |
857 | if (err) |
858 | goto err_out; | |
859 | } | |
860 | /* That's it */ | |
861 | ||
862 | *where->p = where->key; | |
863 | ||
864 | /* | |
865 | * Update the host buffer_head or inode to point to more just allocated | |
866 | * direct blocks blocks | |
867 | */ | |
868 | if (num == 0 && blks > 1) { | |
869 | current_block = le32_to_cpu(where->key) + 1; | |
870 | for (i = 1; i < blks; i++) | |
af5bc92d | 871 | *(where->p + i) = cpu_to_le32(current_block++); |
ac27a0ec DK |
872 | } |
873 | ||
ac27a0ec | 874 | /* We are done with atomic stuff, now do the rest of housekeeping */ |
ac27a0ec DK |
875 | /* had we spliced it onto indirect block? */ |
876 | if (where->bh) { | |
877 | /* | |
878 | * If we spliced it onto an indirect block, we haven't | |
879 | * altered the inode. Note however that if it is being spliced | |
880 | * onto an indirect block at the very end of the file (the | |
881 | * file is growing) then we *will* alter the inode to reflect | |
882 | * the new i_size. But that is not done here - it is done in | |
617ba13b | 883 | * generic_commit_write->__mark_inode_dirty->ext4_dirty_inode. |
ac27a0ec DK |
884 | */ |
885 | jbd_debug(5, "splicing indirect only\n"); | |
0390131b FM |
886 | BUFFER_TRACE(where->bh, "call ext4_handle_dirty_metadata"); |
887 | err = ext4_handle_dirty_metadata(handle, inode, where->bh); | |
ac27a0ec DK |
888 | if (err) |
889 | goto err_out; | |
890 | } else { | |
891 | /* | |
892 | * OK, we spliced it into the inode itself on a direct block. | |
ac27a0ec | 893 | */ |
41591750 | 894 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
895 | jbd_debug(5, "splicing direct\n"); |
896 | } | |
897 | return err; | |
898 | ||
899 | err_out: | |
900 | for (i = 1; i <= num; i++) { | |
60e6679e | 901 | /* |
e6362609 TT |
902 | * branch[i].bh is newly allocated, so there is no |
903 | * need to revoke the block, which is why we don't | |
904 | * need to set EXT4_FREE_BLOCKS_METADATA. | |
b7e57e7c | 905 | */ |
e6362609 TT |
906 | ext4_free_blocks(handle, inode, where[i].bh, 0, 1, |
907 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec | 908 | } |
e6362609 TT |
909 | ext4_free_blocks(handle, inode, 0, le32_to_cpu(where[num].key), |
910 | blks, 0); | |
ac27a0ec DK |
911 | |
912 | return err; | |
913 | } | |
914 | ||
915 | /* | |
e35fd660 | 916 | * The ext4_ind_map_blocks() function handles non-extents inodes |
b920c755 | 917 | * (i.e., using the traditional indirect/double-indirect i_blocks |
e35fd660 | 918 | * scheme) for ext4_map_blocks(). |
b920c755 | 919 | * |
ac27a0ec DK |
920 | * Allocation strategy is simple: if we have to allocate something, we will |
921 | * have to go the whole way to leaf. So let's do it before attaching anything | |
922 | * to tree, set linkage between the newborn blocks, write them if sync is | |
923 | * required, recheck the path, free and repeat if check fails, otherwise | |
924 | * set the last missing link (that will protect us from any truncate-generated | |
925 | * removals - all blocks on the path are immune now) and possibly force the | |
926 | * write on the parent block. | |
927 | * That has a nice additional property: no special recovery from the failed | |
928 | * allocations is needed - we simply release blocks and do not touch anything | |
929 | * reachable from inode. | |
930 | * | |
931 | * `handle' can be NULL if create == 0. | |
932 | * | |
ac27a0ec DK |
933 | * return > 0, # of blocks mapped or allocated. |
934 | * return = 0, if plain lookup failed. | |
935 | * return < 0, error case. | |
c278bfec | 936 | * |
b920c755 TT |
937 | * The ext4_ind_get_blocks() function should be called with |
938 | * down_write(&EXT4_I(inode)->i_data_sem) if allocating filesystem | |
939 | * blocks (i.e., flags has EXT4_GET_BLOCKS_CREATE set) or | |
940 | * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system | |
941 | * blocks. | |
ac27a0ec | 942 | */ |
e35fd660 TT |
943 | static int ext4_ind_map_blocks(handle_t *handle, struct inode *inode, |
944 | struct ext4_map_blocks *map, | |
de9a55b8 | 945 | int flags) |
ac27a0ec DK |
946 | { |
947 | int err = -EIO; | |
725d26d3 | 948 | ext4_lblk_t offsets[4]; |
ac27a0ec DK |
949 | Indirect chain[4]; |
950 | Indirect *partial; | |
617ba13b | 951 | ext4_fsblk_t goal; |
ac27a0ec DK |
952 | int indirect_blks; |
953 | int blocks_to_boundary = 0; | |
954 | int depth; | |
ac27a0ec | 955 | int count = 0; |
617ba13b | 956 | ext4_fsblk_t first_block = 0; |
ac27a0ec | 957 | |
12e9b892 | 958 | J_ASSERT(!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))); |
c2177057 | 959 | J_ASSERT(handle != NULL || (flags & EXT4_GET_BLOCKS_CREATE) == 0); |
e35fd660 | 960 | depth = ext4_block_to_path(inode, map->m_lblk, offsets, |
de9a55b8 | 961 | &blocks_to_boundary); |
ac27a0ec DK |
962 | |
963 | if (depth == 0) | |
964 | goto out; | |
965 | ||
617ba13b | 966 | partial = ext4_get_branch(inode, depth, offsets, chain, &err); |
ac27a0ec DK |
967 | |
968 | /* Simplest case - block found, no allocation needed */ | |
969 | if (!partial) { | |
970 | first_block = le32_to_cpu(chain[depth - 1].key); | |
ac27a0ec DK |
971 | count++; |
972 | /*map more blocks*/ | |
e35fd660 | 973 | while (count < map->m_len && count <= blocks_to_boundary) { |
617ba13b | 974 | ext4_fsblk_t blk; |
ac27a0ec | 975 | |
ac27a0ec DK |
976 | blk = le32_to_cpu(*(chain[depth-1].p + count)); |
977 | ||
978 | if (blk == first_block + count) | |
979 | count++; | |
980 | else | |
981 | break; | |
982 | } | |
c278bfec | 983 | goto got_it; |
ac27a0ec DK |
984 | } |
985 | ||
986 | /* Next simple case - plain lookup or failed read of indirect block */ | |
c2177057 | 987 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0 || err == -EIO) |
ac27a0ec DK |
988 | goto cleanup; |
989 | ||
ac27a0ec | 990 | /* |
c2ea3fde | 991 | * Okay, we need to do block allocation. |
ac27a0ec | 992 | */ |
e35fd660 | 993 | goal = ext4_find_goal(inode, map->m_lblk, partial); |
ac27a0ec DK |
994 | |
995 | /* the number of blocks need to allocate for [d,t]indirect blocks */ | |
996 | indirect_blks = (chain + depth) - partial - 1; | |
997 | ||
998 | /* | |
999 | * Next look up the indirect map to count the totoal number of | |
1000 | * direct blocks to allocate for this branch. | |
1001 | */ | |
617ba13b | 1002 | count = ext4_blks_to_allocate(partial, indirect_blks, |
e35fd660 | 1003 | map->m_len, blocks_to_boundary); |
ac27a0ec | 1004 | /* |
617ba13b | 1005 | * Block out ext4_truncate while we alter the tree |
ac27a0ec | 1006 | */ |
e35fd660 | 1007 | err = ext4_alloc_branch(handle, inode, map->m_lblk, indirect_blks, |
de9a55b8 TT |
1008 | &count, goal, |
1009 | offsets + (partial - chain), partial); | |
ac27a0ec DK |
1010 | |
1011 | /* | |
617ba13b | 1012 | * The ext4_splice_branch call will free and forget any buffers |
ac27a0ec DK |
1013 | * on the new chain if there is a failure, but that risks using |
1014 | * up transaction credits, especially for bitmaps where the | |
1015 | * credits cannot be returned. Can we handle this somehow? We | |
1016 | * may need to return -EAGAIN upwards in the worst case. --sct | |
1017 | */ | |
1018 | if (!err) | |
e35fd660 | 1019 | err = ext4_splice_branch(handle, inode, map->m_lblk, |
de9a55b8 | 1020 | partial, indirect_blks, count); |
2bba702d | 1021 | if (err) |
ac27a0ec DK |
1022 | goto cleanup; |
1023 | ||
e35fd660 | 1024 | map->m_flags |= EXT4_MAP_NEW; |
b436b9be JK |
1025 | |
1026 | ext4_update_inode_fsync_trans(handle, inode, 1); | |
ac27a0ec | 1027 | got_it: |
e35fd660 TT |
1028 | map->m_flags |= EXT4_MAP_MAPPED; |
1029 | map->m_pblk = le32_to_cpu(chain[depth-1].key); | |
1030 | map->m_len = count; | |
ac27a0ec | 1031 | if (count > blocks_to_boundary) |
e35fd660 | 1032 | map->m_flags |= EXT4_MAP_BOUNDARY; |
ac27a0ec DK |
1033 | err = count; |
1034 | /* Clean up and exit */ | |
1035 | partial = chain + depth - 1; /* the whole chain */ | |
1036 | cleanup: | |
1037 | while (partial > chain) { | |
1038 | BUFFER_TRACE(partial->bh, "call brelse"); | |
1039 | brelse(partial->bh); | |
1040 | partial--; | |
1041 | } | |
ac27a0ec DK |
1042 | out: |
1043 | return err; | |
1044 | } | |
1045 | ||
a9e7f447 DM |
1046 | #ifdef CONFIG_QUOTA |
1047 | qsize_t *ext4_get_reserved_space(struct inode *inode) | |
60e58e0f | 1048 | { |
a9e7f447 | 1049 | return &EXT4_I(inode)->i_reserved_quota; |
60e58e0f | 1050 | } |
a9e7f447 | 1051 | #endif |
9d0be502 | 1052 | |
12219aea AK |
1053 | /* |
1054 | * Calculate the number of metadata blocks need to reserve | |
9d0be502 | 1055 | * to allocate a new block at @lblocks for non extent file based file |
12219aea | 1056 | */ |
9d0be502 TT |
1057 | static int ext4_indirect_calc_metadata_amount(struct inode *inode, |
1058 | sector_t lblock) | |
12219aea | 1059 | { |
9d0be502 | 1060 | struct ext4_inode_info *ei = EXT4_I(inode); |
d330a5be | 1061 | sector_t dind_mask = ~((sector_t)EXT4_ADDR_PER_BLOCK(inode->i_sb) - 1); |
9d0be502 | 1062 | int blk_bits; |
12219aea | 1063 | |
9d0be502 TT |
1064 | if (lblock < EXT4_NDIR_BLOCKS) |
1065 | return 0; | |
12219aea | 1066 | |
9d0be502 | 1067 | lblock -= EXT4_NDIR_BLOCKS; |
12219aea | 1068 | |
9d0be502 TT |
1069 | if (ei->i_da_metadata_calc_len && |
1070 | (lblock & dind_mask) == ei->i_da_metadata_calc_last_lblock) { | |
1071 | ei->i_da_metadata_calc_len++; | |
1072 | return 0; | |
1073 | } | |
1074 | ei->i_da_metadata_calc_last_lblock = lblock & dind_mask; | |
1075 | ei->i_da_metadata_calc_len = 1; | |
d330a5be | 1076 | blk_bits = order_base_2(lblock); |
9d0be502 | 1077 | return (blk_bits / EXT4_ADDR_PER_BLOCK_BITS(inode->i_sb)) + 1; |
12219aea AK |
1078 | } |
1079 | ||
1080 | /* | |
1081 | * Calculate the number of metadata blocks need to reserve | |
9d0be502 | 1082 | * to allocate a block located at @lblock |
12219aea | 1083 | */ |
9d0be502 | 1084 | static int ext4_calc_metadata_amount(struct inode *inode, sector_t lblock) |
12219aea | 1085 | { |
12e9b892 | 1086 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
9d0be502 | 1087 | return ext4_ext_calc_metadata_amount(inode, lblock); |
12219aea | 1088 | |
9d0be502 | 1089 | return ext4_indirect_calc_metadata_amount(inode, lblock); |
12219aea AK |
1090 | } |
1091 | ||
0637c6f4 TT |
1092 | /* |
1093 | * Called with i_data_sem down, which is important since we can call | |
1094 | * ext4_discard_preallocations() from here. | |
1095 | */ | |
5f634d06 AK |
1096 | void ext4_da_update_reserve_space(struct inode *inode, |
1097 | int used, int quota_claim) | |
12219aea AK |
1098 | { |
1099 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0637c6f4 | 1100 | struct ext4_inode_info *ei = EXT4_I(inode); |
0637c6f4 TT |
1101 | |
1102 | spin_lock(&ei->i_block_reservation_lock); | |
f8ec9d68 | 1103 | trace_ext4_da_update_reserve_space(inode, used); |
0637c6f4 TT |
1104 | if (unlikely(used > ei->i_reserved_data_blocks)) { |
1105 | ext4_msg(inode->i_sb, KERN_NOTICE, "%s: ino %lu, used %d " | |
1106 | "with only %d reserved data blocks\n", | |
1107 | __func__, inode->i_ino, used, | |
1108 | ei->i_reserved_data_blocks); | |
1109 | WARN_ON(1); | |
1110 | used = ei->i_reserved_data_blocks; | |
1111 | } | |
12219aea | 1112 | |
0637c6f4 TT |
1113 | /* Update per-inode reservations */ |
1114 | ei->i_reserved_data_blocks -= used; | |
0637c6f4 | 1115 | ei->i_reserved_meta_blocks -= ei->i_allocated_meta_blocks; |
72b8ab9d ES |
1116 | percpu_counter_sub(&sbi->s_dirtyblocks_counter, |
1117 | used + ei->i_allocated_meta_blocks); | |
0637c6f4 | 1118 | ei->i_allocated_meta_blocks = 0; |
6bc6e63f | 1119 | |
0637c6f4 TT |
1120 | if (ei->i_reserved_data_blocks == 0) { |
1121 | /* | |
1122 | * We can release all of the reserved metadata blocks | |
1123 | * only when we have written all of the delayed | |
1124 | * allocation blocks. | |
1125 | */ | |
72b8ab9d ES |
1126 | percpu_counter_sub(&sbi->s_dirtyblocks_counter, |
1127 | ei->i_reserved_meta_blocks); | |
ee5f4d9c | 1128 | ei->i_reserved_meta_blocks = 0; |
9d0be502 | 1129 | ei->i_da_metadata_calc_len = 0; |
6bc6e63f | 1130 | } |
12219aea | 1131 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
60e58e0f | 1132 | |
72b8ab9d ES |
1133 | /* Update quota subsystem for data blocks */ |
1134 | if (quota_claim) | |
5dd4056d | 1135 | dquot_claim_block(inode, used); |
72b8ab9d | 1136 | else { |
5f634d06 AK |
1137 | /* |
1138 | * We did fallocate with an offset that is already delayed | |
1139 | * allocated. So on delayed allocated writeback we should | |
72b8ab9d | 1140 | * not re-claim the quota for fallocated blocks. |
5f634d06 | 1141 | */ |
72b8ab9d | 1142 | dquot_release_reservation_block(inode, used); |
5f634d06 | 1143 | } |
d6014301 AK |
1144 | |
1145 | /* | |
1146 | * If we have done all the pending block allocations and if | |
1147 | * there aren't any writers on the inode, we can discard the | |
1148 | * inode's preallocations. | |
1149 | */ | |
0637c6f4 TT |
1150 | if ((ei->i_reserved_data_blocks == 0) && |
1151 | (atomic_read(&inode->i_writecount) == 0)) | |
d6014301 | 1152 | ext4_discard_preallocations(inode); |
12219aea AK |
1153 | } |
1154 | ||
e29136f8 | 1155 | static int __check_block_validity(struct inode *inode, const char *func, |
c398eda0 TT |
1156 | unsigned int line, |
1157 | struct ext4_map_blocks *map) | |
6fd058f7 | 1158 | { |
24676da4 TT |
1159 | if (!ext4_data_block_valid(EXT4_SB(inode->i_sb), map->m_pblk, |
1160 | map->m_len)) { | |
c398eda0 TT |
1161 | ext4_error_inode(inode, func, line, map->m_pblk, |
1162 | "lblock %lu mapped to illegal pblock " | |
1163 | "(length %d)", (unsigned long) map->m_lblk, | |
1164 | map->m_len); | |
6fd058f7 TT |
1165 | return -EIO; |
1166 | } | |
1167 | return 0; | |
1168 | } | |
1169 | ||
e29136f8 | 1170 | #define check_block_validity(inode, map) \ |
c398eda0 | 1171 | __check_block_validity((inode), __func__, __LINE__, (map)) |
e29136f8 | 1172 | |
55138e0b | 1173 | /* |
1f94533d TT |
1174 | * Return the number of contiguous dirty pages in a given inode |
1175 | * starting at page frame idx. | |
55138e0b TT |
1176 | */ |
1177 | static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx, | |
1178 | unsigned int max_pages) | |
1179 | { | |
1180 | struct address_space *mapping = inode->i_mapping; | |
1181 | pgoff_t index; | |
1182 | struct pagevec pvec; | |
1183 | pgoff_t num = 0; | |
1184 | int i, nr_pages, done = 0; | |
1185 | ||
1186 | if (max_pages == 0) | |
1187 | return 0; | |
1188 | pagevec_init(&pvec, 0); | |
1189 | while (!done) { | |
1190 | index = idx; | |
1191 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1192 | PAGECACHE_TAG_DIRTY, | |
1193 | (pgoff_t)PAGEVEC_SIZE); | |
1194 | if (nr_pages == 0) | |
1195 | break; | |
1196 | for (i = 0; i < nr_pages; i++) { | |
1197 | struct page *page = pvec.pages[i]; | |
1198 | struct buffer_head *bh, *head; | |
1199 | ||
1200 | lock_page(page); | |
1201 | if (unlikely(page->mapping != mapping) || | |
1202 | !PageDirty(page) || | |
1203 | PageWriteback(page) || | |
1204 | page->index != idx) { | |
1205 | done = 1; | |
1206 | unlock_page(page); | |
1207 | break; | |
1208 | } | |
1f94533d TT |
1209 | if (page_has_buffers(page)) { |
1210 | bh = head = page_buffers(page); | |
1211 | do { | |
1212 | if (!buffer_delay(bh) && | |
1213 | !buffer_unwritten(bh)) | |
1214 | done = 1; | |
1215 | bh = bh->b_this_page; | |
1216 | } while (!done && (bh != head)); | |
1217 | } | |
55138e0b TT |
1218 | unlock_page(page); |
1219 | if (done) | |
1220 | break; | |
1221 | idx++; | |
1222 | num++; | |
659c6009 ES |
1223 | if (num >= max_pages) { |
1224 | done = 1; | |
55138e0b | 1225 | break; |
659c6009 | 1226 | } |
55138e0b TT |
1227 | } |
1228 | pagevec_release(&pvec); | |
1229 | } | |
1230 | return num; | |
1231 | } | |
1232 | ||
f5ab0d1f | 1233 | /* |
e35fd660 | 1234 | * The ext4_map_blocks() function tries to look up the requested blocks, |
2b2d6d01 | 1235 | * and returns if the blocks are already mapped. |
f5ab0d1f | 1236 | * |
f5ab0d1f MC |
1237 | * Otherwise it takes the write lock of the i_data_sem and allocate blocks |
1238 | * and store the allocated blocks in the result buffer head and mark it | |
1239 | * mapped. | |
1240 | * | |
e35fd660 TT |
1241 | * If file type is extents based, it will call ext4_ext_map_blocks(), |
1242 | * Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping | |
f5ab0d1f MC |
1243 | * based files |
1244 | * | |
1245 | * On success, it returns the number of blocks being mapped or allocate. | |
1246 | * if create==0 and the blocks are pre-allocated and uninitialized block, | |
1247 | * the result buffer head is unmapped. If the create ==1, it will make sure | |
1248 | * the buffer head is mapped. | |
1249 | * | |
1250 | * It returns 0 if plain look up failed (blocks have not been allocated), in | |
1251 | * that casem, buffer head is unmapped | |
1252 | * | |
1253 | * It returns the error in case of allocation failure. | |
1254 | */ | |
e35fd660 TT |
1255 | int ext4_map_blocks(handle_t *handle, struct inode *inode, |
1256 | struct ext4_map_blocks *map, int flags) | |
0e855ac8 AK |
1257 | { |
1258 | int retval; | |
f5ab0d1f | 1259 | |
e35fd660 TT |
1260 | map->m_flags = 0; |
1261 | ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u," | |
1262 | "logical block %lu\n", inode->i_ino, flags, map->m_len, | |
1263 | (unsigned long) map->m_lblk); | |
4df3d265 | 1264 | /* |
b920c755 TT |
1265 | * Try to see if we can get the block without requesting a new |
1266 | * file system block. | |
4df3d265 AK |
1267 | */ |
1268 | down_read((&EXT4_I(inode)->i_data_sem)); | |
12e9b892 | 1269 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
e35fd660 | 1270 | retval = ext4_ext_map_blocks(handle, inode, map, 0); |
0e855ac8 | 1271 | } else { |
e35fd660 | 1272 | retval = ext4_ind_map_blocks(handle, inode, map, 0); |
0e855ac8 | 1273 | } |
4df3d265 | 1274 | up_read((&EXT4_I(inode)->i_data_sem)); |
f5ab0d1f | 1275 | |
e35fd660 | 1276 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
e29136f8 | 1277 | int ret = check_block_validity(inode, map); |
6fd058f7 TT |
1278 | if (ret != 0) |
1279 | return ret; | |
1280 | } | |
1281 | ||
f5ab0d1f | 1282 | /* If it is only a block(s) look up */ |
c2177057 | 1283 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) |
f5ab0d1f MC |
1284 | return retval; |
1285 | ||
1286 | /* | |
1287 | * Returns if the blocks have already allocated | |
1288 | * | |
1289 | * Note that if blocks have been preallocated | |
1290 | * ext4_ext_get_block() returns th create = 0 | |
1291 | * with buffer head unmapped. | |
1292 | */ | |
e35fd660 | 1293 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) |
4df3d265 AK |
1294 | return retval; |
1295 | ||
2a8964d6 AK |
1296 | /* |
1297 | * When we call get_blocks without the create flag, the | |
1298 | * BH_Unwritten flag could have gotten set if the blocks | |
1299 | * requested were part of a uninitialized extent. We need to | |
1300 | * clear this flag now that we are committed to convert all or | |
1301 | * part of the uninitialized extent to be an initialized | |
1302 | * extent. This is because we need to avoid the combination | |
1303 | * of BH_Unwritten and BH_Mapped flags being simultaneously | |
1304 | * set on the buffer_head. | |
1305 | */ | |
e35fd660 | 1306 | map->m_flags &= ~EXT4_MAP_UNWRITTEN; |
2a8964d6 | 1307 | |
4df3d265 | 1308 | /* |
f5ab0d1f MC |
1309 | * New blocks allocate and/or writing to uninitialized extent |
1310 | * will possibly result in updating i_data, so we take | |
1311 | * the write lock of i_data_sem, and call get_blocks() | |
1312 | * with create == 1 flag. | |
4df3d265 AK |
1313 | */ |
1314 | down_write((&EXT4_I(inode)->i_data_sem)); | |
d2a17637 MC |
1315 | |
1316 | /* | |
1317 | * if the caller is from delayed allocation writeout path | |
1318 | * we have already reserved fs blocks for allocation | |
1319 | * let the underlying get_block() function know to | |
1320 | * avoid double accounting | |
1321 | */ | |
c2177057 | 1322 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) |
d2a17637 | 1323 | EXT4_I(inode)->i_delalloc_reserved_flag = 1; |
4df3d265 AK |
1324 | /* |
1325 | * We need to check for EXT4 here because migrate | |
1326 | * could have changed the inode type in between | |
1327 | */ | |
12e9b892 | 1328 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
e35fd660 | 1329 | retval = ext4_ext_map_blocks(handle, inode, map, flags); |
0e855ac8 | 1330 | } else { |
e35fd660 | 1331 | retval = ext4_ind_map_blocks(handle, inode, map, flags); |
267e4db9 | 1332 | |
e35fd660 | 1333 | if (retval > 0 && map->m_flags & EXT4_MAP_NEW) { |
267e4db9 AK |
1334 | /* |
1335 | * We allocated new blocks which will result in | |
1336 | * i_data's format changing. Force the migrate | |
1337 | * to fail by clearing migrate flags | |
1338 | */ | |
19f5fb7a | 1339 | ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
267e4db9 | 1340 | } |
d2a17637 | 1341 | |
5f634d06 AK |
1342 | /* |
1343 | * Update reserved blocks/metadata blocks after successful | |
1344 | * block allocation which had been deferred till now. We don't | |
1345 | * support fallocate for non extent files. So we can update | |
1346 | * reserve space here. | |
1347 | */ | |
1348 | if ((retval > 0) && | |
1296cc85 | 1349 | (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)) |
5f634d06 AK |
1350 | ext4_da_update_reserve_space(inode, retval, 1); |
1351 | } | |
2ac3b6e0 | 1352 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) |
d2a17637 | 1353 | EXT4_I(inode)->i_delalloc_reserved_flag = 0; |
2ac3b6e0 | 1354 | |
4df3d265 | 1355 | up_write((&EXT4_I(inode)->i_data_sem)); |
e35fd660 | 1356 | if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) { |
e29136f8 | 1357 | int ret = check_block_validity(inode, map); |
6fd058f7 TT |
1358 | if (ret != 0) |
1359 | return ret; | |
1360 | } | |
0e855ac8 AK |
1361 | return retval; |
1362 | } | |
1363 | ||
f3bd1f3f MC |
1364 | /* Maximum number of blocks we map for direct IO at once. */ |
1365 | #define DIO_MAX_BLOCKS 4096 | |
1366 | ||
2ed88685 TT |
1367 | static int _ext4_get_block(struct inode *inode, sector_t iblock, |
1368 | struct buffer_head *bh, int flags) | |
ac27a0ec | 1369 | { |
3e4fdaf8 | 1370 | handle_t *handle = ext4_journal_current_handle(); |
2ed88685 | 1371 | struct ext4_map_blocks map; |
7fb5409d | 1372 | int ret = 0, started = 0; |
f3bd1f3f | 1373 | int dio_credits; |
ac27a0ec | 1374 | |
2ed88685 TT |
1375 | map.m_lblk = iblock; |
1376 | map.m_len = bh->b_size >> inode->i_blkbits; | |
1377 | ||
1378 | if (flags && !handle) { | |
7fb5409d | 1379 | /* Direct IO write... */ |
2ed88685 TT |
1380 | if (map.m_len > DIO_MAX_BLOCKS) |
1381 | map.m_len = DIO_MAX_BLOCKS; | |
1382 | dio_credits = ext4_chunk_trans_blocks(inode, map.m_len); | |
f3bd1f3f | 1383 | handle = ext4_journal_start(inode, dio_credits); |
7fb5409d | 1384 | if (IS_ERR(handle)) { |
ac27a0ec | 1385 | ret = PTR_ERR(handle); |
2ed88685 | 1386 | return ret; |
ac27a0ec | 1387 | } |
7fb5409d | 1388 | started = 1; |
ac27a0ec DK |
1389 | } |
1390 | ||
2ed88685 | 1391 | ret = ext4_map_blocks(handle, inode, &map, flags); |
7fb5409d | 1392 | if (ret > 0) { |
2ed88685 TT |
1393 | map_bh(bh, inode->i_sb, map.m_pblk); |
1394 | bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; | |
1395 | bh->b_size = inode->i_sb->s_blocksize * map.m_len; | |
7fb5409d | 1396 | ret = 0; |
ac27a0ec | 1397 | } |
7fb5409d JK |
1398 | if (started) |
1399 | ext4_journal_stop(handle); | |
ac27a0ec DK |
1400 | return ret; |
1401 | } | |
1402 | ||
2ed88685 TT |
1403 | int ext4_get_block(struct inode *inode, sector_t iblock, |
1404 | struct buffer_head *bh, int create) | |
1405 | { | |
1406 | return _ext4_get_block(inode, iblock, bh, | |
1407 | create ? EXT4_GET_BLOCKS_CREATE : 0); | |
1408 | } | |
1409 | ||
ac27a0ec DK |
1410 | /* |
1411 | * `handle' can be NULL if create is zero | |
1412 | */ | |
617ba13b | 1413 | struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode, |
725d26d3 | 1414 | ext4_lblk_t block, int create, int *errp) |
ac27a0ec | 1415 | { |
2ed88685 TT |
1416 | struct ext4_map_blocks map; |
1417 | struct buffer_head *bh; | |
ac27a0ec DK |
1418 | int fatal = 0, err; |
1419 | ||
1420 | J_ASSERT(handle != NULL || create == 0); | |
1421 | ||
2ed88685 TT |
1422 | map.m_lblk = block; |
1423 | map.m_len = 1; | |
1424 | err = ext4_map_blocks(handle, inode, &map, | |
1425 | create ? EXT4_GET_BLOCKS_CREATE : 0); | |
ac27a0ec | 1426 | |
2ed88685 TT |
1427 | if (err < 0) |
1428 | *errp = err; | |
1429 | if (err <= 0) | |
1430 | return NULL; | |
1431 | *errp = 0; | |
1432 | ||
1433 | bh = sb_getblk(inode->i_sb, map.m_pblk); | |
1434 | if (!bh) { | |
1435 | *errp = -EIO; | |
1436 | return NULL; | |
ac27a0ec | 1437 | } |
2ed88685 TT |
1438 | if (map.m_flags & EXT4_MAP_NEW) { |
1439 | J_ASSERT(create != 0); | |
1440 | J_ASSERT(handle != NULL); | |
ac27a0ec | 1441 | |
2ed88685 TT |
1442 | /* |
1443 | * Now that we do not always journal data, we should | |
1444 | * keep in mind whether this should always journal the | |
1445 | * new buffer as metadata. For now, regular file | |
1446 | * writes use ext4_get_block instead, so it's not a | |
1447 | * problem. | |
1448 | */ | |
1449 | lock_buffer(bh); | |
1450 | BUFFER_TRACE(bh, "call get_create_access"); | |
1451 | fatal = ext4_journal_get_create_access(handle, bh); | |
1452 | if (!fatal && !buffer_uptodate(bh)) { | |
1453 | memset(bh->b_data, 0, inode->i_sb->s_blocksize); | |
1454 | set_buffer_uptodate(bh); | |
ac27a0ec | 1455 | } |
2ed88685 TT |
1456 | unlock_buffer(bh); |
1457 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); | |
1458 | err = ext4_handle_dirty_metadata(handle, inode, bh); | |
1459 | if (!fatal) | |
1460 | fatal = err; | |
1461 | } else { | |
1462 | BUFFER_TRACE(bh, "not a new buffer"); | |
ac27a0ec | 1463 | } |
2ed88685 TT |
1464 | if (fatal) { |
1465 | *errp = fatal; | |
1466 | brelse(bh); | |
1467 | bh = NULL; | |
1468 | } | |
1469 | return bh; | |
ac27a0ec DK |
1470 | } |
1471 | ||
617ba13b | 1472 | struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode, |
725d26d3 | 1473 | ext4_lblk_t block, int create, int *err) |
ac27a0ec | 1474 | { |
af5bc92d | 1475 | struct buffer_head *bh; |
ac27a0ec | 1476 | |
617ba13b | 1477 | bh = ext4_getblk(handle, inode, block, create, err); |
ac27a0ec DK |
1478 | if (!bh) |
1479 | return bh; | |
1480 | if (buffer_uptodate(bh)) | |
1481 | return bh; | |
1482 | ll_rw_block(READ_META, 1, &bh); | |
1483 | wait_on_buffer(bh); | |
1484 | if (buffer_uptodate(bh)) | |
1485 | return bh; | |
1486 | put_bh(bh); | |
1487 | *err = -EIO; | |
1488 | return NULL; | |
1489 | } | |
1490 | ||
af5bc92d TT |
1491 | static int walk_page_buffers(handle_t *handle, |
1492 | struct buffer_head *head, | |
1493 | unsigned from, | |
1494 | unsigned to, | |
1495 | int *partial, | |
1496 | int (*fn)(handle_t *handle, | |
1497 | struct buffer_head *bh)) | |
ac27a0ec DK |
1498 | { |
1499 | struct buffer_head *bh; | |
1500 | unsigned block_start, block_end; | |
1501 | unsigned blocksize = head->b_size; | |
1502 | int err, ret = 0; | |
1503 | struct buffer_head *next; | |
1504 | ||
af5bc92d TT |
1505 | for (bh = head, block_start = 0; |
1506 | ret == 0 && (bh != head || !block_start); | |
de9a55b8 | 1507 | block_start = block_end, bh = next) { |
ac27a0ec DK |
1508 | next = bh->b_this_page; |
1509 | block_end = block_start + blocksize; | |
1510 | if (block_end <= from || block_start >= to) { | |
1511 | if (partial && !buffer_uptodate(bh)) | |
1512 | *partial = 1; | |
1513 | continue; | |
1514 | } | |
1515 | err = (*fn)(handle, bh); | |
1516 | if (!ret) | |
1517 | ret = err; | |
1518 | } | |
1519 | return ret; | |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * To preserve ordering, it is essential that the hole instantiation and | |
1524 | * the data write be encapsulated in a single transaction. We cannot | |
617ba13b | 1525 | * close off a transaction and start a new one between the ext4_get_block() |
dab291af | 1526 | * and the commit_write(). So doing the jbd2_journal_start at the start of |
ac27a0ec DK |
1527 | * prepare_write() is the right place. |
1528 | * | |
617ba13b MC |
1529 | * Also, this function can nest inside ext4_writepage() -> |
1530 | * block_write_full_page(). In that case, we *know* that ext4_writepage() | |
ac27a0ec DK |
1531 | * has generated enough buffer credits to do the whole page. So we won't |
1532 | * block on the journal in that case, which is good, because the caller may | |
1533 | * be PF_MEMALLOC. | |
1534 | * | |
617ba13b | 1535 | * By accident, ext4 can be reentered when a transaction is open via |
ac27a0ec DK |
1536 | * quota file writes. If we were to commit the transaction while thus |
1537 | * reentered, there can be a deadlock - we would be holding a quota | |
1538 | * lock, and the commit would never complete if another thread had a | |
1539 | * transaction open and was blocking on the quota lock - a ranking | |
1540 | * violation. | |
1541 | * | |
dab291af | 1542 | * So what we do is to rely on the fact that jbd2_journal_stop/journal_start |
ac27a0ec DK |
1543 | * will _not_ run commit under these circumstances because handle->h_ref |
1544 | * is elevated. We'll still have enough credits for the tiny quotafile | |
1545 | * write. | |
1546 | */ | |
1547 | static int do_journal_get_write_access(handle_t *handle, | |
de9a55b8 | 1548 | struct buffer_head *bh) |
ac27a0ec | 1549 | { |
56d35a4c JK |
1550 | int dirty = buffer_dirty(bh); |
1551 | int ret; | |
1552 | ||
ac27a0ec DK |
1553 | if (!buffer_mapped(bh) || buffer_freed(bh)) |
1554 | return 0; | |
56d35a4c | 1555 | /* |
ebdec241 | 1556 | * __block_write_begin() could have dirtied some buffers. Clean |
56d35a4c JK |
1557 | * the dirty bit as jbd2_journal_get_write_access() could complain |
1558 | * otherwise about fs integrity issues. Setting of the dirty bit | |
ebdec241 | 1559 | * by __block_write_begin() isn't a real problem here as we clear |
56d35a4c JK |
1560 | * the bit before releasing a page lock and thus writeback cannot |
1561 | * ever write the buffer. | |
1562 | */ | |
1563 | if (dirty) | |
1564 | clear_buffer_dirty(bh); | |
1565 | ret = ext4_journal_get_write_access(handle, bh); | |
1566 | if (!ret && dirty) | |
1567 | ret = ext4_handle_dirty_metadata(handle, NULL, bh); | |
1568 | return ret; | |
ac27a0ec DK |
1569 | } |
1570 | ||
b9a4207d JK |
1571 | /* |
1572 | * Truncate blocks that were not used by write. We have to truncate the | |
1573 | * pagecache as well so that corresponding buffers get properly unmapped. | |
1574 | */ | |
1575 | static void ext4_truncate_failed_write(struct inode *inode) | |
1576 | { | |
1577 | truncate_inode_pages(inode->i_mapping, inode->i_size); | |
1578 | ext4_truncate(inode); | |
1579 | } | |
1580 | ||
744692dc JZ |
1581 | static int ext4_get_block_write(struct inode *inode, sector_t iblock, |
1582 | struct buffer_head *bh_result, int create); | |
bfc1af65 | 1583 | static int ext4_write_begin(struct file *file, struct address_space *mapping, |
de9a55b8 TT |
1584 | loff_t pos, unsigned len, unsigned flags, |
1585 | struct page **pagep, void **fsdata) | |
ac27a0ec | 1586 | { |
af5bc92d | 1587 | struct inode *inode = mapping->host; |
1938a150 | 1588 | int ret, needed_blocks; |
ac27a0ec DK |
1589 | handle_t *handle; |
1590 | int retries = 0; | |
af5bc92d | 1591 | struct page *page; |
de9a55b8 | 1592 | pgoff_t index; |
af5bc92d | 1593 | unsigned from, to; |
bfc1af65 | 1594 | |
9bffad1e | 1595 | trace_ext4_write_begin(inode, pos, len, flags); |
1938a150 AK |
1596 | /* |
1597 | * Reserve one block more for addition to orphan list in case | |
1598 | * we allocate blocks but write fails for some reason | |
1599 | */ | |
1600 | needed_blocks = ext4_writepage_trans_blocks(inode) + 1; | |
de9a55b8 | 1601 | index = pos >> PAGE_CACHE_SHIFT; |
af5bc92d TT |
1602 | from = pos & (PAGE_CACHE_SIZE - 1); |
1603 | to = from + len; | |
ac27a0ec DK |
1604 | |
1605 | retry: | |
af5bc92d TT |
1606 | handle = ext4_journal_start(inode, needed_blocks); |
1607 | if (IS_ERR(handle)) { | |
1608 | ret = PTR_ERR(handle); | |
1609 | goto out; | |
7479d2b9 | 1610 | } |
ac27a0ec | 1611 | |
ebd3610b JK |
1612 | /* We cannot recurse into the filesystem as the transaction is already |
1613 | * started */ | |
1614 | flags |= AOP_FLAG_NOFS; | |
1615 | ||
54566b2c | 1616 | page = grab_cache_page_write_begin(mapping, index, flags); |
cf108bca JK |
1617 | if (!page) { |
1618 | ext4_journal_stop(handle); | |
1619 | ret = -ENOMEM; | |
1620 | goto out; | |
1621 | } | |
1622 | *pagep = page; | |
1623 | ||
744692dc | 1624 | if (ext4_should_dioread_nolock(inode)) |
6e1db88d | 1625 | ret = __block_write_begin(page, pos, len, ext4_get_block_write); |
744692dc | 1626 | else |
6e1db88d | 1627 | ret = __block_write_begin(page, pos, len, ext4_get_block); |
bfc1af65 NP |
1628 | |
1629 | if (!ret && ext4_should_journal_data(inode)) { | |
ac27a0ec DK |
1630 | ret = walk_page_buffers(handle, page_buffers(page), |
1631 | from, to, NULL, do_journal_get_write_access); | |
1632 | } | |
bfc1af65 NP |
1633 | |
1634 | if (ret) { | |
af5bc92d | 1635 | unlock_page(page); |
af5bc92d | 1636 | page_cache_release(page); |
ae4d5372 | 1637 | /* |
6e1db88d | 1638 | * __block_write_begin may have instantiated a few blocks |
ae4d5372 AK |
1639 | * outside i_size. Trim these off again. Don't need |
1640 | * i_size_read because we hold i_mutex. | |
1938a150 AK |
1641 | * |
1642 | * Add inode to orphan list in case we crash before | |
1643 | * truncate finishes | |
ae4d5372 | 1644 | */ |
ffacfa7a | 1645 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
1938a150 AK |
1646 | ext4_orphan_add(handle, inode); |
1647 | ||
1648 | ext4_journal_stop(handle); | |
1649 | if (pos + len > inode->i_size) { | |
b9a4207d | 1650 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1651 | /* |
ffacfa7a | 1652 | * If truncate failed early the inode might |
1938a150 AK |
1653 | * still be on the orphan list; we need to |
1654 | * make sure the inode is removed from the | |
1655 | * orphan list in that case. | |
1656 | */ | |
1657 | if (inode->i_nlink) | |
1658 | ext4_orphan_del(NULL, inode); | |
1659 | } | |
bfc1af65 NP |
1660 | } |
1661 | ||
617ba13b | 1662 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) |
ac27a0ec | 1663 | goto retry; |
7479d2b9 | 1664 | out: |
ac27a0ec DK |
1665 | return ret; |
1666 | } | |
1667 | ||
bfc1af65 NP |
1668 | /* For write_end() in data=journal mode */ |
1669 | static int write_end_fn(handle_t *handle, struct buffer_head *bh) | |
ac27a0ec DK |
1670 | { |
1671 | if (!buffer_mapped(bh) || buffer_freed(bh)) | |
1672 | return 0; | |
1673 | set_buffer_uptodate(bh); | |
0390131b | 1674 | return ext4_handle_dirty_metadata(handle, NULL, bh); |
ac27a0ec DK |
1675 | } |
1676 | ||
f8514083 | 1677 | static int ext4_generic_write_end(struct file *file, |
de9a55b8 TT |
1678 | struct address_space *mapping, |
1679 | loff_t pos, unsigned len, unsigned copied, | |
1680 | struct page *page, void *fsdata) | |
f8514083 AK |
1681 | { |
1682 | int i_size_changed = 0; | |
1683 | struct inode *inode = mapping->host; | |
1684 | handle_t *handle = ext4_journal_current_handle(); | |
1685 | ||
1686 | copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); | |
1687 | ||
1688 | /* | |
1689 | * No need to use i_size_read() here, the i_size | |
1690 | * cannot change under us because we hold i_mutex. | |
1691 | * | |
1692 | * But it's important to update i_size while still holding page lock: | |
1693 | * page writeout could otherwise come in and zero beyond i_size. | |
1694 | */ | |
1695 | if (pos + copied > inode->i_size) { | |
1696 | i_size_write(inode, pos + copied); | |
1697 | i_size_changed = 1; | |
1698 | } | |
1699 | ||
1700 | if (pos + copied > EXT4_I(inode)->i_disksize) { | |
1701 | /* We need to mark inode dirty even if | |
1702 | * new_i_size is less that inode->i_size | |
1703 | * bu greater than i_disksize.(hint delalloc) | |
1704 | */ | |
1705 | ext4_update_i_disksize(inode, (pos + copied)); | |
1706 | i_size_changed = 1; | |
1707 | } | |
1708 | unlock_page(page); | |
1709 | page_cache_release(page); | |
1710 | ||
1711 | /* | |
1712 | * Don't mark the inode dirty under page lock. First, it unnecessarily | |
1713 | * makes the holding time of page lock longer. Second, it forces lock | |
1714 | * ordering of page lock and transaction start for journaling | |
1715 | * filesystems. | |
1716 | */ | |
1717 | if (i_size_changed) | |
1718 | ext4_mark_inode_dirty(handle, inode); | |
1719 | ||
1720 | return copied; | |
1721 | } | |
1722 | ||
ac27a0ec DK |
1723 | /* |
1724 | * We need to pick up the new inode size which generic_commit_write gave us | |
1725 | * `file' can be NULL - eg, when called from page_symlink(). | |
1726 | * | |
617ba13b | 1727 | * ext4 never places buffers on inode->i_mapping->private_list. metadata |
ac27a0ec DK |
1728 | * buffers are managed internally. |
1729 | */ | |
bfc1af65 | 1730 | static int ext4_ordered_write_end(struct file *file, |
de9a55b8 TT |
1731 | struct address_space *mapping, |
1732 | loff_t pos, unsigned len, unsigned copied, | |
1733 | struct page *page, void *fsdata) | |
ac27a0ec | 1734 | { |
617ba13b | 1735 | handle_t *handle = ext4_journal_current_handle(); |
cf108bca | 1736 | struct inode *inode = mapping->host; |
ac27a0ec DK |
1737 | int ret = 0, ret2; |
1738 | ||
9bffad1e | 1739 | trace_ext4_ordered_write_end(inode, pos, len, copied); |
678aaf48 | 1740 | ret = ext4_jbd2_file_inode(handle, inode); |
ac27a0ec DK |
1741 | |
1742 | if (ret == 0) { | |
f8514083 | 1743 | ret2 = ext4_generic_write_end(file, mapping, pos, len, copied, |
bfc1af65 | 1744 | page, fsdata); |
f8a87d89 | 1745 | copied = ret2; |
ffacfa7a | 1746 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1747 | /* if we have allocated more blocks and copied |
1748 | * less. We will have blocks allocated outside | |
1749 | * inode->i_size. So truncate them | |
1750 | */ | |
1751 | ext4_orphan_add(handle, inode); | |
f8a87d89 RK |
1752 | if (ret2 < 0) |
1753 | ret = ret2; | |
ac27a0ec | 1754 | } |
617ba13b | 1755 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1756 | if (!ret) |
1757 | ret = ret2; | |
bfc1af65 | 1758 | |
f8514083 | 1759 | if (pos + len > inode->i_size) { |
b9a4207d | 1760 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1761 | /* |
ffacfa7a | 1762 | * If truncate failed early the inode might still be |
f8514083 AK |
1763 | * on the orphan list; we need to make sure the inode |
1764 | * is removed from the orphan list in that case. | |
1765 | */ | |
1766 | if (inode->i_nlink) | |
1767 | ext4_orphan_del(NULL, inode); | |
1768 | } | |
1769 | ||
1770 | ||
bfc1af65 | 1771 | return ret ? ret : copied; |
ac27a0ec DK |
1772 | } |
1773 | ||
bfc1af65 | 1774 | static int ext4_writeback_write_end(struct file *file, |
de9a55b8 TT |
1775 | struct address_space *mapping, |
1776 | loff_t pos, unsigned len, unsigned copied, | |
1777 | struct page *page, void *fsdata) | |
ac27a0ec | 1778 | { |
617ba13b | 1779 | handle_t *handle = ext4_journal_current_handle(); |
cf108bca | 1780 | struct inode *inode = mapping->host; |
ac27a0ec | 1781 | int ret = 0, ret2; |
ac27a0ec | 1782 | |
9bffad1e | 1783 | trace_ext4_writeback_write_end(inode, pos, len, copied); |
f8514083 | 1784 | ret2 = ext4_generic_write_end(file, mapping, pos, len, copied, |
bfc1af65 | 1785 | page, fsdata); |
f8a87d89 | 1786 | copied = ret2; |
ffacfa7a | 1787 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1788 | /* if we have allocated more blocks and copied |
1789 | * less. We will have blocks allocated outside | |
1790 | * inode->i_size. So truncate them | |
1791 | */ | |
1792 | ext4_orphan_add(handle, inode); | |
1793 | ||
f8a87d89 RK |
1794 | if (ret2 < 0) |
1795 | ret = ret2; | |
ac27a0ec | 1796 | |
617ba13b | 1797 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1798 | if (!ret) |
1799 | ret = ret2; | |
bfc1af65 | 1800 | |
f8514083 | 1801 | if (pos + len > inode->i_size) { |
b9a4207d | 1802 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1803 | /* |
ffacfa7a | 1804 | * If truncate failed early the inode might still be |
f8514083 AK |
1805 | * on the orphan list; we need to make sure the inode |
1806 | * is removed from the orphan list in that case. | |
1807 | */ | |
1808 | if (inode->i_nlink) | |
1809 | ext4_orphan_del(NULL, inode); | |
1810 | } | |
1811 | ||
bfc1af65 | 1812 | return ret ? ret : copied; |
ac27a0ec DK |
1813 | } |
1814 | ||
bfc1af65 | 1815 | static int ext4_journalled_write_end(struct file *file, |
de9a55b8 TT |
1816 | struct address_space *mapping, |
1817 | loff_t pos, unsigned len, unsigned copied, | |
1818 | struct page *page, void *fsdata) | |
ac27a0ec | 1819 | { |
617ba13b | 1820 | handle_t *handle = ext4_journal_current_handle(); |
bfc1af65 | 1821 | struct inode *inode = mapping->host; |
ac27a0ec DK |
1822 | int ret = 0, ret2; |
1823 | int partial = 0; | |
bfc1af65 | 1824 | unsigned from, to; |
cf17fea6 | 1825 | loff_t new_i_size; |
ac27a0ec | 1826 | |
9bffad1e | 1827 | trace_ext4_journalled_write_end(inode, pos, len, copied); |
bfc1af65 NP |
1828 | from = pos & (PAGE_CACHE_SIZE - 1); |
1829 | to = from + len; | |
1830 | ||
1831 | if (copied < len) { | |
1832 | if (!PageUptodate(page)) | |
1833 | copied = 0; | |
1834 | page_zero_new_buffers(page, from+copied, to); | |
1835 | } | |
ac27a0ec DK |
1836 | |
1837 | ret = walk_page_buffers(handle, page_buffers(page), from, | |
bfc1af65 | 1838 | to, &partial, write_end_fn); |
ac27a0ec DK |
1839 | if (!partial) |
1840 | SetPageUptodate(page); | |
cf17fea6 AK |
1841 | new_i_size = pos + copied; |
1842 | if (new_i_size > inode->i_size) | |
bfc1af65 | 1843 | i_size_write(inode, pos+copied); |
19f5fb7a | 1844 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); |
cf17fea6 AK |
1845 | if (new_i_size > EXT4_I(inode)->i_disksize) { |
1846 | ext4_update_i_disksize(inode, new_i_size); | |
617ba13b | 1847 | ret2 = ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
1848 | if (!ret) |
1849 | ret = ret2; | |
1850 | } | |
bfc1af65 | 1851 | |
cf108bca | 1852 | unlock_page(page); |
f8514083 | 1853 | page_cache_release(page); |
ffacfa7a | 1854 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
f8514083 AK |
1855 | /* if we have allocated more blocks and copied |
1856 | * less. We will have blocks allocated outside | |
1857 | * inode->i_size. So truncate them | |
1858 | */ | |
1859 | ext4_orphan_add(handle, inode); | |
1860 | ||
617ba13b | 1861 | ret2 = ext4_journal_stop(handle); |
ac27a0ec DK |
1862 | if (!ret) |
1863 | ret = ret2; | |
f8514083 | 1864 | if (pos + len > inode->i_size) { |
b9a4207d | 1865 | ext4_truncate_failed_write(inode); |
de9a55b8 | 1866 | /* |
ffacfa7a | 1867 | * If truncate failed early the inode might still be |
f8514083 AK |
1868 | * on the orphan list; we need to make sure the inode |
1869 | * is removed from the orphan list in that case. | |
1870 | */ | |
1871 | if (inode->i_nlink) | |
1872 | ext4_orphan_del(NULL, inode); | |
1873 | } | |
bfc1af65 NP |
1874 | |
1875 | return ret ? ret : copied; | |
ac27a0ec | 1876 | } |
d2a17637 | 1877 | |
9d0be502 TT |
1878 | /* |
1879 | * Reserve a single block located at lblock | |
1880 | */ | |
1881 | static int ext4_da_reserve_space(struct inode *inode, sector_t lblock) | |
d2a17637 | 1882 | { |
030ba6bc | 1883 | int retries = 0; |
60e58e0f | 1884 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
0637c6f4 | 1885 | struct ext4_inode_info *ei = EXT4_I(inode); |
72b8ab9d | 1886 | unsigned long md_needed; |
5dd4056d | 1887 | int ret; |
d2a17637 MC |
1888 | |
1889 | /* | |
1890 | * recalculate the amount of metadata blocks to reserve | |
1891 | * in order to allocate nrblocks | |
1892 | * worse case is one extent per block | |
1893 | */ | |
030ba6bc | 1894 | repeat: |
0637c6f4 | 1895 | spin_lock(&ei->i_block_reservation_lock); |
9d0be502 | 1896 | md_needed = ext4_calc_metadata_amount(inode, lblock); |
f8ec9d68 | 1897 | trace_ext4_da_reserve_space(inode, md_needed); |
0637c6f4 | 1898 | spin_unlock(&ei->i_block_reservation_lock); |
d2a17637 | 1899 | |
60e58e0f | 1900 | /* |
72b8ab9d ES |
1901 | * We will charge metadata quota at writeout time; this saves |
1902 | * us from metadata over-estimation, though we may go over by | |
1903 | * a small amount in the end. Here we just reserve for data. | |
60e58e0f | 1904 | */ |
72b8ab9d | 1905 | ret = dquot_reserve_block(inode, 1); |
5dd4056d CH |
1906 | if (ret) |
1907 | return ret; | |
72b8ab9d ES |
1908 | /* |
1909 | * We do still charge estimated metadata to the sb though; | |
1910 | * we cannot afford to run out of free blocks. | |
1911 | */ | |
9d0be502 | 1912 | if (ext4_claim_free_blocks(sbi, md_needed + 1)) { |
72b8ab9d | 1913 | dquot_release_reservation_block(inode, 1); |
030ba6bc AK |
1914 | if (ext4_should_retry_alloc(inode->i_sb, &retries)) { |
1915 | yield(); | |
1916 | goto repeat; | |
1917 | } | |
d2a17637 MC |
1918 | return -ENOSPC; |
1919 | } | |
0637c6f4 | 1920 | spin_lock(&ei->i_block_reservation_lock); |
9d0be502 | 1921 | ei->i_reserved_data_blocks++; |
0637c6f4 TT |
1922 | ei->i_reserved_meta_blocks += md_needed; |
1923 | spin_unlock(&ei->i_block_reservation_lock); | |
39bc680a | 1924 | |
d2a17637 MC |
1925 | return 0; /* success */ |
1926 | } | |
1927 | ||
12219aea | 1928 | static void ext4_da_release_space(struct inode *inode, int to_free) |
d2a17637 MC |
1929 | { |
1930 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0637c6f4 | 1931 | struct ext4_inode_info *ei = EXT4_I(inode); |
d2a17637 | 1932 | |
cd213226 MC |
1933 | if (!to_free) |
1934 | return; /* Nothing to release, exit */ | |
1935 | ||
d2a17637 | 1936 | spin_lock(&EXT4_I(inode)->i_block_reservation_lock); |
cd213226 | 1937 | |
5a58ec87 | 1938 | trace_ext4_da_release_space(inode, to_free); |
0637c6f4 | 1939 | if (unlikely(to_free > ei->i_reserved_data_blocks)) { |
cd213226 | 1940 | /* |
0637c6f4 TT |
1941 | * if there aren't enough reserved blocks, then the |
1942 | * counter is messed up somewhere. Since this | |
1943 | * function is called from invalidate page, it's | |
1944 | * harmless to return without any action. | |
cd213226 | 1945 | */ |
0637c6f4 TT |
1946 | ext4_msg(inode->i_sb, KERN_NOTICE, "ext4_da_release_space: " |
1947 | "ino %lu, to_free %d with only %d reserved " | |
1948 | "data blocks\n", inode->i_ino, to_free, | |
1949 | ei->i_reserved_data_blocks); | |
1950 | WARN_ON(1); | |
1951 | to_free = ei->i_reserved_data_blocks; | |
cd213226 | 1952 | } |
0637c6f4 | 1953 | ei->i_reserved_data_blocks -= to_free; |
cd213226 | 1954 | |
0637c6f4 TT |
1955 | if (ei->i_reserved_data_blocks == 0) { |
1956 | /* | |
1957 | * We can release all of the reserved metadata blocks | |
1958 | * only when we have written all of the delayed | |
1959 | * allocation blocks. | |
1960 | */ | |
72b8ab9d ES |
1961 | percpu_counter_sub(&sbi->s_dirtyblocks_counter, |
1962 | ei->i_reserved_meta_blocks); | |
ee5f4d9c | 1963 | ei->i_reserved_meta_blocks = 0; |
9d0be502 | 1964 | ei->i_da_metadata_calc_len = 0; |
0637c6f4 | 1965 | } |
d2a17637 | 1966 | |
72b8ab9d | 1967 | /* update fs dirty data blocks counter */ |
0637c6f4 | 1968 | percpu_counter_sub(&sbi->s_dirtyblocks_counter, to_free); |
d2a17637 | 1969 | |
d2a17637 | 1970 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
60e58e0f | 1971 | |
5dd4056d | 1972 | dquot_release_reservation_block(inode, to_free); |
d2a17637 MC |
1973 | } |
1974 | ||
1975 | static void ext4_da_page_release_reservation(struct page *page, | |
de9a55b8 | 1976 | unsigned long offset) |
d2a17637 MC |
1977 | { |
1978 | int to_release = 0; | |
1979 | struct buffer_head *head, *bh; | |
1980 | unsigned int curr_off = 0; | |
1981 | ||
1982 | head = page_buffers(page); | |
1983 | bh = head; | |
1984 | do { | |
1985 | unsigned int next_off = curr_off + bh->b_size; | |
1986 | ||
1987 | if ((offset <= curr_off) && (buffer_delay(bh))) { | |
1988 | to_release++; | |
1989 | clear_buffer_delay(bh); | |
1990 | } | |
1991 | curr_off = next_off; | |
1992 | } while ((bh = bh->b_this_page) != head); | |
12219aea | 1993 | ext4_da_release_space(page->mapping->host, to_release); |
d2a17637 | 1994 | } |
ac27a0ec | 1995 | |
64769240 AT |
1996 | /* |
1997 | * Delayed allocation stuff | |
1998 | */ | |
1999 | ||
64769240 AT |
2000 | /* |
2001 | * mpage_da_submit_io - walks through extent of pages and try to write | |
a1d6cc56 | 2002 | * them with writepage() call back |
64769240 AT |
2003 | * |
2004 | * @mpd->inode: inode | |
2005 | * @mpd->first_page: first page of the extent | |
2006 | * @mpd->next_page: page after the last page of the extent | |
64769240 AT |
2007 | * |
2008 | * By the time mpage_da_submit_io() is called we expect all blocks | |
2009 | * to be allocated. this may be wrong if allocation failed. | |
2010 | * | |
2011 | * As pages are already locked by write_cache_pages(), we can't use it | |
2012 | */ | |
1de3e3df TT |
2013 | static int mpage_da_submit_io(struct mpage_da_data *mpd, |
2014 | struct ext4_map_blocks *map) | |
64769240 | 2015 | { |
791b7f08 AK |
2016 | struct pagevec pvec; |
2017 | unsigned long index, end; | |
2018 | int ret = 0, err, nr_pages, i; | |
2019 | struct inode *inode = mpd->inode; | |
2020 | struct address_space *mapping = inode->i_mapping; | |
cb20d518 | 2021 | loff_t size = i_size_read(inode); |
3ecdb3a1 TT |
2022 | unsigned int len, block_start; |
2023 | struct buffer_head *bh, *page_bufs = NULL; | |
cb20d518 | 2024 | int journal_data = ext4_should_journal_data(inode); |
1de3e3df | 2025 | sector_t pblock = 0, cur_logical = 0; |
bd2d0210 | 2026 | struct ext4_io_submit io_submit; |
64769240 AT |
2027 | |
2028 | BUG_ON(mpd->next_page <= mpd->first_page); | |
bd2d0210 | 2029 | memset(&io_submit, 0, sizeof(io_submit)); |
791b7f08 AK |
2030 | /* |
2031 | * We need to start from the first_page to the next_page - 1 | |
2032 | * to make sure we also write the mapped dirty buffer_heads. | |
8dc207c0 | 2033 | * If we look at mpd->b_blocknr we would only be looking |
791b7f08 AK |
2034 | * at the currently mapped buffer_heads. |
2035 | */ | |
64769240 AT |
2036 | index = mpd->first_page; |
2037 | end = mpd->next_page - 1; | |
2038 | ||
791b7f08 | 2039 | pagevec_init(&pvec, 0); |
64769240 | 2040 | while (index <= end) { |
791b7f08 | 2041 | nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); |
64769240 AT |
2042 | if (nr_pages == 0) |
2043 | break; | |
2044 | for (i = 0; i < nr_pages; i++) { | |
1de3e3df | 2045 | int commit_write = 0, redirty_page = 0; |
64769240 AT |
2046 | struct page *page = pvec.pages[i]; |
2047 | ||
791b7f08 AK |
2048 | index = page->index; |
2049 | if (index > end) | |
2050 | break; | |
cb20d518 TT |
2051 | |
2052 | if (index == size >> PAGE_CACHE_SHIFT) | |
2053 | len = size & ~PAGE_CACHE_MASK; | |
2054 | else | |
2055 | len = PAGE_CACHE_SIZE; | |
1de3e3df TT |
2056 | if (map) { |
2057 | cur_logical = index << (PAGE_CACHE_SHIFT - | |
2058 | inode->i_blkbits); | |
2059 | pblock = map->m_pblk + (cur_logical - | |
2060 | map->m_lblk); | |
2061 | } | |
791b7f08 AK |
2062 | index++; |
2063 | ||
2064 | BUG_ON(!PageLocked(page)); | |
2065 | BUG_ON(PageWriteback(page)); | |
2066 | ||
64769240 | 2067 | /* |
cb20d518 TT |
2068 | * If the page does not have buffers (for |
2069 | * whatever reason), try to create them using | |
a107e5a3 | 2070 | * __block_write_begin. If this fails, |
cb20d518 | 2071 | * redirty the page and move on. |
64769240 | 2072 | */ |
cb20d518 | 2073 | if (!page_has_buffers(page)) { |
a107e5a3 | 2074 | if (__block_write_begin(page, 0, len, |
cb20d518 TT |
2075 | noalloc_get_block_write)) { |
2076 | redirty_page: | |
2077 | redirty_page_for_writepage(mpd->wbc, | |
2078 | page); | |
2079 | unlock_page(page); | |
2080 | continue; | |
2081 | } | |
2082 | commit_write = 1; | |
2083 | } | |
64769240 | 2084 | |
3ecdb3a1 TT |
2085 | bh = page_bufs = page_buffers(page); |
2086 | block_start = 0; | |
64769240 | 2087 | do { |
1de3e3df | 2088 | if (!bh) |
3ecdb3a1 | 2089 | goto redirty_page; |
1de3e3df TT |
2090 | if (map && (cur_logical >= map->m_lblk) && |
2091 | (cur_logical <= (map->m_lblk + | |
2092 | (map->m_len - 1)))) { | |
29fa89d0 AK |
2093 | if (buffer_delay(bh)) { |
2094 | clear_buffer_delay(bh); | |
2095 | bh->b_blocknr = pblock; | |
29fa89d0 | 2096 | } |
1de3e3df TT |
2097 | if (buffer_unwritten(bh) || |
2098 | buffer_mapped(bh)) | |
2099 | BUG_ON(bh->b_blocknr != pblock); | |
2100 | if (map->m_flags & EXT4_MAP_UNINIT) | |
2101 | set_buffer_uninit(bh); | |
2102 | clear_buffer_unwritten(bh); | |
2103 | } | |
29fa89d0 | 2104 | |
1de3e3df TT |
2105 | /* redirty page if block allocation undone */ |
2106 | if (buffer_delay(bh) || buffer_unwritten(bh)) | |
2107 | redirty_page = 1; | |
3ecdb3a1 TT |
2108 | bh = bh->b_this_page; |
2109 | block_start += bh->b_size; | |
64769240 AT |
2110 | cur_logical++; |
2111 | pblock++; | |
1de3e3df TT |
2112 | } while (bh != page_bufs); |
2113 | ||
2114 | if (redirty_page) | |
2115 | goto redirty_page; | |
cb20d518 TT |
2116 | |
2117 | if (commit_write) | |
2118 | /* mark the buffer_heads as dirty & uptodate */ | |
2119 | block_commit_write(page, 0, len); | |
2120 | ||
bd2d0210 TT |
2121 | /* |
2122 | * Delalloc doesn't support data journalling, | |
2123 | * but eventually maybe we'll lift this | |
2124 | * restriction. | |
2125 | */ | |
2126 | if (unlikely(journal_data && PageChecked(page))) | |
cb20d518 | 2127 | err = __ext4_journalled_writepage(page, len); |
1449032b | 2128 | else if (test_opt(inode->i_sb, MBLK_IO_SUBMIT)) |
bd2d0210 TT |
2129 | err = ext4_bio_write_page(&io_submit, page, |
2130 | len, mpd->wbc); | |
1449032b TT |
2131 | else |
2132 | err = block_write_full_page(page, | |
2133 | noalloc_get_block_write, mpd->wbc); | |
cb20d518 TT |
2134 | |
2135 | if (!err) | |
a1d6cc56 | 2136 | mpd->pages_written++; |
64769240 AT |
2137 | /* |
2138 | * In error case, we have to continue because | |
2139 | * remaining pages are still locked | |
64769240 AT |
2140 | */ |
2141 | if (ret == 0) | |
2142 | ret = err; | |
64769240 AT |
2143 | } |
2144 | pagevec_release(&pvec); | |
2145 | } | |
bd2d0210 | 2146 | ext4_io_submit(&io_submit); |
64769240 | 2147 | return ret; |
64769240 AT |
2148 | } |
2149 | ||
c4a0c46e AK |
2150 | static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd, |
2151 | sector_t logical, long blk_cnt) | |
2152 | { | |
2153 | int nr_pages, i; | |
2154 | pgoff_t index, end; | |
2155 | struct pagevec pvec; | |
2156 | struct inode *inode = mpd->inode; | |
2157 | struct address_space *mapping = inode->i_mapping; | |
2158 | ||
2159 | index = logical >> (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
2160 | end = (logical + blk_cnt - 1) >> | |
2161 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
2162 | while (index <= end) { | |
2163 | nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); | |
2164 | if (nr_pages == 0) | |
2165 | break; | |
2166 | for (i = 0; i < nr_pages; i++) { | |
2167 | struct page *page = pvec.pages[i]; | |
9b1d0998 | 2168 | if (page->index > end) |
c4a0c46e | 2169 | break; |
c4a0c46e AK |
2170 | BUG_ON(!PageLocked(page)); |
2171 | BUG_ON(PageWriteback(page)); | |
2172 | block_invalidatepage(page, 0); | |
2173 | ClearPageUptodate(page); | |
2174 | unlock_page(page); | |
2175 | } | |
9b1d0998 JK |
2176 | index = pvec.pages[nr_pages - 1]->index + 1; |
2177 | pagevec_release(&pvec); | |
c4a0c46e AK |
2178 | } |
2179 | return; | |
2180 | } | |
2181 | ||
df22291f AK |
2182 | static void ext4_print_free_blocks(struct inode *inode) |
2183 | { | |
2184 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
1693918e TT |
2185 | printk(KERN_CRIT "Total free blocks count %lld\n", |
2186 | ext4_count_free_blocks(inode->i_sb)); | |
2187 | printk(KERN_CRIT "Free/Dirty block details\n"); | |
2188 | printk(KERN_CRIT "free_blocks=%lld\n", | |
2189 | (long long) percpu_counter_sum(&sbi->s_freeblocks_counter)); | |
2190 | printk(KERN_CRIT "dirty_blocks=%lld\n", | |
2191 | (long long) percpu_counter_sum(&sbi->s_dirtyblocks_counter)); | |
2192 | printk(KERN_CRIT "Block reservation details\n"); | |
2193 | printk(KERN_CRIT "i_reserved_data_blocks=%u\n", | |
2194 | EXT4_I(inode)->i_reserved_data_blocks); | |
2195 | printk(KERN_CRIT "i_reserved_meta_blocks=%u\n", | |
2196 | EXT4_I(inode)->i_reserved_meta_blocks); | |
df22291f AK |
2197 | return; |
2198 | } | |
2199 | ||
64769240 | 2200 | /* |
5a87b7a5 TT |
2201 | * mpage_da_map_and_submit - go through given space, map them |
2202 | * if necessary, and then submit them for I/O | |
64769240 | 2203 | * |
8dc207c0 | 2204 | * @mpd - bh describing space |
64769240 AT |
2205 | * |
2206 | * The function skips space we know is already mapped to disk blocks. | |
2207 | * | |
64769240 | 2208 | */ |
5a87b7a5 | 2209 | static void mpage_da_map_and_submit(struct mpage_da_data *mpd) |
64769240 | 2210 | { |
2ac3b6e0 | 2211 | int err, blks, get_blocks_flags; |
1de3e3df | 2212 | struct ext4_map_blocks map, *mapp = NULL; |
2fa3cdfb TT |
2213 | sector_t next = mpd->b_blocknr; |
2214 | unsigned max_blocks = mpd->b_size >> mpd->inode->i_blkbits; | |
2215 | loff_t disksize = EXT4_I(mpd->inode)->i_disksize; | |
2216 | handle_t *handle = NULL; | |
64769240 AT |
2217 | |
2218 | /* | |
5a87b7a5 TT |
2219 | * If the blocks are mapped already, or we couldn't accumulate |
2220 | * any blocks, then proceed immediately to the submission stage. | |
2fa3cdfb | 2221 | */ |
5a87b7a5 TT |
2222 | if ((mpd->b_size == 0) || |
2223 | ((mpd->b_state & (1 << BH_Mapped)) && | |
2224 | !(mpd->b_state & (1 << BH_Delay)) && | |
2225 | !(mpd->b_state & (1 << BH_Unwritten)))) | |
2226 | goto submit_io; | |
2fa3cdfb TT |
2227 | |
2228 | handle = ext4_journal_current_handle(); | |
2229 | BUG_ON(!handle); | |
2230 | ||
79ffab34 | 2231 | /* |
79e83036 | 2232 | * Call ext4_map_blocks() to allocate any delayed allocation |
2ac3b6e0 TT |
2233 | * blocks, or to convert an uninitialized extent to be |
2234 | * initialized (in the case where we have written into | |
2235 | * one or more preallocated blocks). | |
2236 | * | |
2237 | * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE to | |
2238 | * indicate that we are on the delayed allocation path. This | |
2239 | * affects functions in many different parts of the allocation | |
2240 | * call path. This flag exists primarily because we don't | |
79e83036 | 2241 | * want to change *many* call functions, so ext4_map_blocks() |
2ac3b6e0 TT |
2242 | * will set the magic i_delalloc_reserved_flag once the |
2243 | * inode's allocation semaphore is taken. | |
2244 | * | |
2245 | * If the blocks in questions were delalloc blocks, set | |
2246 | * EXT4_GET_BLOCKS_DELALLOC_RESERVE so the delalloc accounting | |
2247 | * variables are updated after the blocks have been allocated. | |
79ffab34 | 2248 | */ |
2ed88685 TT |
2249 | map.m_lblk = next; |
2250 | map.m_len = max_blocks; | |
1296cc85 | 2251 | get_blocks_flags = EXT4_GET_BLOCKS_CREATE; |
744692dc JZ |
2252 | if (ext4_should_dioread_nolock(mpd->inode)) |
2253 | get_blocks_flags |= EXT4_GET_BLOCKS_IO_CREATE_EXT; | |
2ac3b6e0 | 2254 | if (mpd->b_state & (1 << BH_Delay)) |
1296cc85 AK |
2255 | get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE; |
2256 | ||
2ed88685 | 2257 | blks = ext4_map_blocks(handle, mpd->inode, &map, get_blocks_flags); |
2fa3cdfb | 2258 | if (blks < 0) { |
e3570639 ES |
2259 | struct super_block *sb = mpd->inode->i_sb; |
2260 | ||
2fa3cdfb | 2261 | err = blks; |
ed5bde0b | 2262 | /* |
5a87b7a5 TT |
2263 | * If get block returns EAGAIN or ENOSPC and there |
2264 | * appears to be free blocks we will call | |
2265 | * ext4_writepage() for all of the pages which will | |
2266 | * just redirty the pages. | |
c4a0c46e AK |
2267 | */ |
2268 | if (err == -EAGAIN) | |
5a87b7a5 | 2269 | goto submit_io; |
df22291f AK |
2270 | |
2271 | if (err == -ENOSPC && | |
e3570639 | 2272 | ext4_count_free_blocks(sb)) { |
df22291f | 2273 | mpd->retval = err; |
5a87b7a5 | 2274 | goto submit_io; |
df22291f AK |
2275 | } |
2276 | ||
c4a0c46e | 2277 | /* |
ed5bde0b TT |
2278 | * get block failure will cause us to loop in |
2279 | * writepages, because a_ops->writepage won't be able | |
2280 | * to make progress. The page will be redirtied by | |
2281 | * writepage and writepages will again try to write | |
2282 | * the same. | |
c4a0c46e | 2283 | */ |
e3570639 ES |
2284 | if (!(EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)) { |
2285 | ext4_msg(sb, KERN_CRIT, | |
2286 | "delayed block allocation failed for inode %lu " | |
2287 | "at logical offset %llu with max blocks %zd " | |
2288 | "with error %d", mpd->inode->i_ino, | |
2289 | (unsigned long long) next, | |
2290 | mpd->b_size >> mpd->inode->i_blkbits, err); | |
2291 | ext4_msg(sb, KERN_CRIT, | |
2292 | "This should not happen!! Data will be lost\n"); | |
2293 | if (err == -ENOSPC) | |
2294 | ext4_print_free_blocks(mpd->inode); | |
030ba6bc | 2295 | } |
2fa3cdfb | 2296 | /* invalidate all the pages */ |
c4a0c46e | 2297 | ext4_da_block_invalidatepages(mpd, next, |
8dc207c0 | 2298 | mpd->b_size >> mpd->inode->i_blkbits); |
5a87b7a5 | 2299 | return; |
c4a0c46e | 2300 | } |
2fa3cdfb TT |
2301 | BUG_ON(blks == 0); |
2302 | ||
1de3e3df | 2303 | mapp = ↦ |
2ed88685 TT |
2304 | if (map.m_flags & EXT4_MAP_NEW) { |
2305 | struct block_device *bdev = mpd->inode->i_sb->s_bdev; | |
2306 | int i; | |
64769240 | 2307 | |
2ed88685 TT |
2308 | for (i = 0; i < map.m_len; i++) |
2309 | unmap_underlying_metadata(bdev, map.m_pblk + i); | |
2310 | } | |
64769240 | 2311 | |
2fa3cdfb TT |
2312 | if (ext4_should_order_data(mpd->inode)) { |
2313 | err = ext4_jbd2_file_inode(handle, mpd->inode); | |
2314 | if (err) | |
5a87b7a5 TT |
2315 | /* This only happens if the journal is aborted */ |
2316 | return; | |
2fa3cdfb TT |
2317 | } |
2318 | ||
2319 | /* | |
03f5d8bc | 2320 | * Update on-disk size along with block allocation. |
2fa3cdfb TT |
2321 | */ |
2322 | disksize = ((loff_t) next + blks) << mpd->inode->i_blkbits; | |
2323 | if (disksize > i_size_read(mpd->inode)) | |
2324 | disksize = i_size_read(mpd->inode); | |
2325 | if (disksize > EXT4_I(mpd->inode)->i_disksize) { | |
2326 | ext4_update_i_disksize(mpd->inode, disksize); | |
5a87b7a5 TT |
2327 | err = ext4_mark_inode_dirty(handle, mpd->inode); |
2328 | if (err) | |
2329 | ext4_error(mpd->inode->i_sb, | |
2330 | "Failed to mark inode %lu dirty", | |
2331 | mpd->inode->i_ino); | |
2fa3cdfb TT |
2332 | } |
2333 | ||
5a87b7a5 | 2334 | submit_io: |
1de3e3df | 2335 | mpage_da_submit_io(mpd, mapp); |
5a87b7a5 | 2336 | mpd->io_done = 1; |
64769240 AT |
2337 | } |
2338 | ||
bf068ee2 AK |
2339 | #define BH_FLAGS ((1 << BH_Uptodate) | (1 << BH_Mapped) | \ |
2340 | (1 << BH_Delay) | (1 << BH_Unwritten)) | |
64769240 AT |
2341 | |
2342 | /* | |
2343 | * mpage_add_bh_to_extent - try to add one more block to extent of blocks | |
2344 | * | |
2345 | * @mpd->lbh - extent of blocks | |
2346 | * @logical - logical number of the block in the file | |
2347 | * @bh - bh of the block (used to access block's state) | |
2348 | * | |
2349 | * the function is used to collect contig. blocks in same state | |
2350 | */ | |
2351 | static void mpage_add_bh_to_extent(struct mpage_da_data *mpd, | |
8dc207c0 TT |
2352 | sector_t logical, size_t b_size, |
2353 | unsigned long b_state) | |
64769240 | 2354 | { |
64769240 | 2355 | sector_t next; |
8dc207c0 | 2356 | int nrblocks = mpd->b_size >> mpd->inode->i_blkbits; |
64769240 | 2357 | |
c445e3e0 ES |
2358 | /* |
2359 | * XXX Don't go larger than mballoc is willing to allocate | |
2360 | * This is a stopgap solution. We eventually need to fold | |
2361 | * mpage_da_submit_io() into this function and then call | |
79e83036 | 2362 | * ext4_map_blocks() multiple times in a loop |
c445e3e0 ES |
2363 | */ |
2364 | if (nrblocks >= 8*1024*1024/mpd->inode->i_sb->s_blocksize) | |
2365 | goto flush_it; | |
2366 | ||
525f4ed8 | 2367 | /* check if thereserved journal credits might overflow */ |
12e9b892 | 2368 | if (!(ext4_test_inode_flag(mpd->inode, EXT4_INODE_EXTENTS))) { |
525f4ed8 MC |
2369 | if (nrblocks >= EXT4_MAX_TRANS_DATA) { |
2370 | /* | |
2371 | * With non-extent format we are limited by the journal | |
2372 | * credit available. Total credit needed to insert | |
2373 | * nrblocks contiguous blocks is dependent on the | |
2374 | * nrblocks. So limit nrblocks. | |
2375 | */ | |
2376 | goto flush_it; | |
2377 | } else if ((nrblocks + (b_size >> mpd->inode->i_blkbits)) > | |
2378 | EXT4_MAX_TRANS_DATA) { | |
2379 | /* | |
2380 | * Adding the new buffer_head would make it cross the | |
2381 | * allowed limit for which we have journal credit | |
2382 | * reserved. So limit the new bh->b_size | |
2383 | */ | |
2384 | b_size = (EXT4_MAX_TRANS_DATA - nrblocks) << | |
2385 | mpd->inode->i_blkbits; | |
2386 | /* we will do mpage_da_submit_io in the next loop */ | |
2387 | } | |
2388 | } | |
64769240 AT |
2389 | /* |
2390 | * First block in the extent | |
2391 | */ | |
8dc207c0 TT |
2392 | if (mpd->b_size == 0) { |
2393 | mpd->b_blocknr = logical; | |
2394 | mpd->b_size = b_size; | |
2395 | mpd->b_state = b_state & BH_FLAGS; | |
64769240 AT |
2396 | return; |
2397 | } | |
2398 | ||
8dc207c0 | 2399 | next = mpd->b_blocknr + nrblocks; |
64769240 AT |
2400 | /* |
2401 | * Can we merge the block to our big extent? | |
2402 | */ | |
8dc207c0 TT |
2403 | if (logical == next && (b_state & BH_FLAGS) == mpd->b_state) { |
2404 | mpd->b_size += b_size; | |
64769240 AT |
2405 | return; |
2406 | } | |
2407 | ||
525f4ed8 | 2408 | flush_it: |
64769240 AT |
2409 | /* |
2410 | * We couldn't merge the block to our extent, so we | |
2411 | * need to flush current extent and start new one | |
2412 | */ | |
5a87b7a5 | 2413 | mpage_da_map_and_submit(mpd); |
a1d6cc56 | 2414 | return; |
64769240 AT |
2415 | } |
2416 | ||
c364b22c | 2417 | static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh) |
29fa89d0 | 2418 | { |
c364b22c | 2419 | return (buffer_delay(bh) || buffer_unwritten(bh)) && buffer_dirty(bh); |
29fa89d0 AK |
2420 | } |
2421 | ||
64769240 AT |
2422 | /* |
2423 | * __mpage_da_writepage - finds extent of pages and blocks | |
2424 | * | |
2425 | * @page: page to consider | |
2426 | * @wbc: not used, we just follow rules | |
2427 | * @data: context | |
2428 | * | |
2429 | * The function finds extents of pages and scan them for all blocks. | |
2430 | */ | |
2431 | static int __mpage_da_writepage(struct page *page, | |
bbd08344 ES |
2432 | struct writeback_control *wbc, |
2433 | struct mpage_da_data *mpd) | |
64769240 | 2434 | { |
64769240 | 2435 | struct inode *inode = mpd->inode; |
8dc207c0 | 2436 | struct buffer_head *bh, *head; |
64769240 AT |
2437 | sector_t logical; |
2438 | ||
2439 | /* | |
2440 | * Can we merge this page to current extent? | |
2441 | */ | |
2442 | if (mpd->next_page != page->index) { | |
2443 | /* | |
2444 | * Nope, we can't. So, we map non-allocated blocks | |
5a87b7a5 | 2445 | * and start IO on them |
64769240 AT |
2446 | */ |
2447 | if (mpd->next_page != mpd->first_page) { | |
5a87b7a5 | 2448 | mpage_da_map_and_submit(mpd); |
a1d6cc56 AK |
2449 | /* |
2450 | * skip rest of the page in the page_vec | |
2451 | */ | |
a1d6cc56 AK |
2452 | redirty_page_for_writepage(wbc, page); |
2453 | unlock_page(page); | |
2454 | return MPAGE_DA_EXTENT_TAIL; | |
64769240 AT |
2455 | } |
2456 | ||
2457 | /* | |
2458 | * Start next extent of pages ... | |
2459 | */ | |
2460 | mpd->first_page = page->index; | |
2461 | ||
2462 | /* | |
2463 | * ... and blocks | |
2464 | */ | |
8dc207c0 TT |
2465 | mpd->b_size = 0; |
2466 | mpd->b_state = 0; | |
2467 | mpd->b_blocknr = 0; | |
64769240 AT |
2468 | } |
2469 | ||
2470 | mpd->next_page = page->index + 1; | |
2471 | logical = (sector_t) page->index << | |
2472 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
2473 | ||
2474 | if (!page_has_buffers(page)) { | |
8dc207c0 TT |
2475 | mpage_add_bh_to_extent(mpd, logical, PAGE_CACHE_SIZE, |
2476 | (1 << BH_Dirty) | (1 << BH_Uptodate)); | |
a1d6cc56 AK |
2477 | if (mpd->io_done) |
2478 | return MPAGE_DA_EXTENT_TAIL; | |
64769240 AT |
2479 | } else { |
2480 | /* | |
2481 | * Page with regular buffer heads, just add all dirty ones | |
2482 | */ | |
2483 | head = page_buffers(page); | |
2484 | bh = head; | |
2485 | do { | |
2486 | BUG_ON(buffer_locked(bh)); | |
791b7f08 AK |
2487 | /* |
2488 | * We need to try to allocate | |
2489 | * unmapped blocks in the same page. | |
2490 | * Otherwise we won't make progress | |
43ce1d23 | 2491 | * with the page in ext4_writepage |
791b7f08 | 2492 | */ |
c364b22c | 2493 | if (ext4_bh_delay_or_unwritten(NULL, bh)) { |
8dc207c0 TT |
2494 | mpage_add_bh_to_extent(mpd, logical, |
2495 | bh->b_size, | |
2496 | bh->b_state); | |
a1d6cc56 AK |
2497 | if (mpd->io_done) |
2498 | return MPAGE_DA_EXTENT_TAIL; | |
791b7f08 AK |
2499 | } else if (buffer_dirty(bh) && (buffer_mapped(bh))) { |
2500 | /* | |
2501 | * mapped dirty buffer. We need to update | |
2502 | * the b_state because we look at | |
2503 | * b_state in mpage_da_map_blocks. We don't | |
2504 | * update b_size because if we find an | |
2505 | * unmapped buffer_head later we need to | |
2506 | * use the b_state flag of that buffer_head. | |
2507 | */ | |
8dc207c0 TT |
2508 | if (mpd->b_size == 0) |
2509 | mpd->b_state = bh->b_state & BH_FLAGS; | |
a1d6cc56 | 2510 | } |
64769240 AT |
2511 | logical++; |
2512 | } while ((bh = bh->b_this_page) != head); | |
2513 | } | |
2514 | ||
2515 | return 0; | |
2516 | } | |
2517 | ||
64769240 | 2518 | /* |
b920c755 TT |
2519 | * This is a special get_blocks_t callback which is used by |
2520 | * ext4_da_write_begin(). It will either return mapped block or | |
2521 | * reserve space for a single block. | |
29fa89d0 AK |
2522 | * |
2523 | * For delayed buffer_head we have BH_Mapped, BH_New, BH_Delay set. | |
2524 | * We also have b_blocknr = -1 and b_bdev initialized properly | |
2525 | * | |
2526 | * For unwritten buffer_head we have BH_Mapped, BH_New, BH_Unwritten set. | |
2527 | * We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev | |
2528 | * initialized properly. | |
64769240 AT |
2529 | */ |
2530 | static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, | |
2ed88685 | 2531 | struct buffer_head *bh, int create) |
64769240 | 2532 | { |
2ed88685 | 2533 | struct ext4_map_blocks map; |
64769240 | 2534 | int ret = 0; |
33b9817e AK |
2535 | sector_t invalid_block = ~((sector_t) 0xffff); |
2536 | ||
2537 | if (invalid_block < ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es)) | |
2538 | invalid_block = ~0; | |
64769240 AT |
2539 | |
2540 | BUG_ON(create == 0); | |
2ed88685 TT |
2541 | BUG_ON(bh->b_size != inode->i_sb->s_blocksize); |
2542 | ||
2543 | map.m_lblk = iblock; | |
2544 | map.m_len = 1; | |
64769240 AT |
2545 | |
2546 | /* | |
2547 | * first, we need to know whether the block is allocated already | |
2548 | * preallocated blocks are unmapped but should treated | |
2549 | * the same as allocated blocks. | |
2550 | */ | |
2ed88685 TT |
2551 | ret = ext4_map_blocks(NULL, inode, &map, 0); |
2552 | if (ret < 0) | |
2553 | return ret; | |
2554 | if (ret == 0) { | |
2555 | if (buffer_delay(bh)) | |
2556 | return 0; /* Not sure this could or should happen */ | |
64769240 | 2557 | /* |
ebdec241 | 2558 | * XXX: __block_write_begin() unmaps passed block, is it OK? |
64769240 | 2559 | */ |
9d0be502 | 2560 | ret = ext4_da_reserve_space(inode, iblock); |
d2a17637 MC |
2561 | if (ret) |
2562 | /* not enough space to reserve */ | |
2563 | return ret; | |
2564 | ||
2ed88685 TT |
2565 | map_bh(bh, inode->i_sb, invalid_block); |
2566 | set_buffer_new(bh); | |
2567 | set_buffer_delay(bh); | |
2568 | return 0; | |
64769240 AT |
2569 | } |
2570 | ||
2ed88685 TT |
2571 | map_bh(bh, inode->i_sb, map.m_pblk); |
2572 | bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags; | |
2573 | ||
2574 | if (buffer_unwritten(bh)) { | |
2575 | /* A delayed write to unwritten bh should be marked | |
2576 | * new and mapped. Mapped ensures that we don't do | |
2577 | * get_block multiple times when we write to the same | |
2578 | * offset and new ensures that we do proper zero out | |
2579 | * for partial write. | |
2580 | */ | |
2581 | set_buffer_new(bh); | |
2582 | set_buffer_mapped(bh); | |
2583 | } | |
2584 | return 0; | |
64769240 | 2585 | } |
61628a3f | 2586 | |
b920c755 TT |
2587 | /* |
2588 | * This function is used as a standard get_block_t calback function | |
2589 | * when there is no desire to allocate any blocks. It is used as a | |
ebdec241 | 2590 | * callback function for block_write_begin() and block_write_full_page(). |
206f7ab4 | 2591 | * These functions should only try to map a single block at a time. |
b920c755 TT |
2592 | * |
2593 | * Since this function doesn't do block allocations even if the caller | |
2594 | * requests it by passing in create=1, it is critically important that | |
2595 | * any caller checks to make sure that any buffer heads are returned | |
2596 | * by this function are either all already mapped or marked for | |
206f7ab4 CH |
2597 | * delayed allocation before calling block_write_full_page(). Otherwise, |
2598 | * b_blocknr could be left unitialized, and the page write functions will | |
2599 | * be taken by surprise. | |
b920c755 TT |
2600 | */ |
2601 | static int noalloc_get_block_write(struct inode *inode, sector_t iblock, | |
f0e6c985 AK |
2602 | struct buffer_head *bh_result, int create) |
2603 | { | |
a2dc52b5 | 2604 | BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize); |
2ed88685 | 2605 | return _ext4_get_block(inode, iblock, bh_result, 0); |
61628a3f MC |
2606 | } |
2607 | ||
62e086be AK |
2608 | static int bget_one(handle_t *handle, struct buffer_head *bh) |
2609 | { | |
2610 | get_bh(bh); | |
2611 | return 0; | |
2612 | } | |
2613 | ||
2614 | static int bput_one(handle_t *handle, struct buffer_head *bh) | |
2615 | { | |
2616 | put_bh(bh); | |
2617 | return 0; | |
2618 | } | |
2619 | ||
2620 | static int __ext4_journalled_writepage(struct page *page, | |
62e086be AK |
2621 | unsigned int len) |
2622 | { | |
2623 | struct address_space *mapping = page->mapping; | |
2624 | struct inode *inode = mapping->host; | |
2625 | struct buffer_head *page_bufs; | |
2626 | handle_t *handle = NULL; | |
2627 | int ret = 0; | |
2628 | int err; | |
2629 | ||
cb20d518 | 2630 | ClearPageChecked(page); |
62e086be AK |
2631 | page_bufs = page_buffers(page); |
2632 | BUG_ON(!page_bufs); | |
2633 | walk_page_buffers(handle, page_bufs, 0, len, NULL, bget_one); | |
2634 | /* As soon as we unlock the page, it can go away, but we have | |
2635 | * references to buffers so we are safe */ | |
2636 | unlock_page(page); | |
2637 | ||
2638 | handle = ext4_journal_start(inode, ext4_writepage_trans_blocks(inode)); | |
2639 | if (IS_ERR(handle)) { | |
2640 | ret = PTR_ERR(handle); | |
2641 | goto out; | |
2642 | } | |
2643 | ||
2644 | ret = walk_page_buffers(handle, page_bufs, 0, len, NULL, | |
2645 | do_journal_get_write_access); | |
2646 | ||
2647 | err = walk_page_buffers(handle, page_bufs, 0, len, NULL, | |
2648 | write_end_fn); | |
2649 | if (ret == 0) | |
2650 | ret = err; | |
2651 | err = ext4_journal_stop(handle); | |
2652 | if (!ret) | |
2653 | ret = err; | |
2654 | ||
2655 | walk_page_buffers(handle, page_bufs, 0, len, NULL, bput_one); | |
19f5fb7a | 2656 | ext4_set_inode_state(inode, EXT4_STATE_JDATA); |
62e086be AK |
2657 | out: |
2658 | return ret; | |
2659 | } | |
2660 | ||
744692dc JZ |
2661 | static int ext4_set_bh_endio(struct buffer_head *bh, struct inode *inode); |
2662 | static void ext4_end_io_buffer_write(struct buffer_head *bh, int uptodate); | |
2663 | ||
61628a3f | 2664 | /* |
43ce1d23 AK |
2665 | * Note that we don't need to start a transaction unless we're journaling data |
2666 | * because we should have holes filled from ext4_page_mkwrite(). We even don't | |
2667 | * need to file the inode to the transaction's list in ordered mode because if | |
2668 | * we are writing back data added by write(), the inode is already there and if | |
2669 | * we are writing back data modified via mmap(), noone guarantees in which | |
2670 | * transaction the data will hit the disk. In case we are journaling data, we | |
2671 | * cannot start transaction directly because transaction start ranks above page | |
2672 | * lock so we have to do some magic. | |
2673 | * | |
b920c755 TT |
2674 | * This function can get called via... |
2675 | * - ext4_da_writepages after taking page lock (have journal handle) | |
2676 | * - journal_submit_inode_data_buffers (no journal handle) | |
2677 | * - shrink_page_list via pdflush (no journal handle) | |
2678 | * - grab_page_cache when doing write_begin (have journal handle) | |
43ce1d23 AK |
2679 | * |
2680 | * We don't do any block allocation in this function. If we have page with | |
2681 | * multiple blocks we need to write those buffer_heads that are mapped. This | |
2682 | * is important for mmaped based write. So if we do with blocksize 1K | |
2683 | * truncate(f, 1024); | |
2684 | * a = mmap(f, 0, 4096); | |
2685 | * a[0] = 'a'; | |
2686 | * truncate(f, 4096); | |
2687 | * we have in the page first buffer_head mapped via page_mkwrite call back | |
2688 | * but other bufer_heads would be unmapped but dirty(dirty done via the | |
2689 | * do_wp_page). So writepage should write the first block. If we modify | |
2690 | * the mmap area beyond 1024 we will again get a page_fault and the | |
2691 | * page_mkwrite callback will do the block allocation and mark the | |
2692 | * buffer_heads mapped. | |
2693 | * | |
2694 | * We redirty the page if we have any buffer_heads that is either delay or | |
2695 | * unwritten in the page. | |
2696 | * | |
2697 | * We can get recursively called as show below. | |
2698 | * | |
2699 | * ext4_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() -> | |
2700 | * ext4_writepage() | |
2701 | * | |
2702 | * But since we don't do any block allocation we should not deadlock. | |
2703 | * Page also have the dirty flag cleared so we don't get recurive page_lock. | |
61628a3f | 2704 | */ |
43ce1d23 | 2705 | static int ext4_writepage(struct page *page, |
62e086be | 2706 | struct writeback_control *wbc) |
64769240 | 2707 | { |
a42afc5f | 2708 | int ret = 0, commit_write = 0; |
61628a3f | 2709 | loff_t size; |
498e5f24 | 2710 | unsigned int len; |
744692dc | 2711 | struct buffer_head *page_bufs = NULL; |
61628a3f MC |
2712 | struct inode *inode = page->mapping->host; |
2713 | ||
43ce1d23 | 2714 | trace_ext4_writepage(inode, page); |
f0e6c985 AK |
2715 | size = i_size_read(inode); |
2716 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
2717 | len = size & ~PAGE_CACHE_MASK; | |
2718 | else | |
2719 | len = PAGE_CACHE_SIZE; | |
64769240 | 2720 | |
a42afc5f TT |
2721 | /* |
2722 | * If the page does not have buffers (for whatever reason), | |
a107e5a3 | 2723 | * try to create them using __block_write_begin. If this |
a42afc5f TT |
2724 | * fails, redirty the page and move on. |
2725 | */ | |
b1142e8f | 2726 | if (!page_has_buffers(page)) { |
a107e5a3 | 2727 | if (__block_write_begin(page, 0, len, |
a42afc5f TT |
2728 | noalloc_get_block_write)) { |
2729 | redirty_page: | |
f0e6c985 AK |
2730 | redirty_page_for_writepage(wbc, page); |
2731 | unlock_page(page); | |
2732 | return 0; | |
2733 | } | |
a42afc5f TT |
2734 | commit_write = 1; |
2735 | } | |
2736 | page_bufs = page_buffers(page); | |
2737 | if (walk_page_buffers(NULL, page_bufs, 0, len, NULL, | |
2738 | ext4_bh_delay_or_unwritten)) { | |
f0e6c985 | 2739 | /* |
b1142e8f TT |
2740 | * We don't want to do block allocation, so redirty |
2741 | * the page and return. We may reach here when we do | |
2742 | * a journal commit via journal_submit_inode_data_buffers. | |
2743 | * We can also reach here via shrink_page_list | |
f0e6c985 | 2744 | */ |
a42afc5f TT |
2745 | goto redirty_page; |
2746 | } | |
2747 | if (commit_write) | |
ed9b3e33 | 2748 | /* now mark the buffer_heads as dirty and uptodate */ |
b767e78a | 2749 | block_commit_write(page, 0, len); |
64769240 | 2750 | |
cb20d518 | 2751 | if (PageChecked(page) && ext4_should_journal_data(inode)) |
43ce1d23 AK |
2752 | /* |
2753 | * It's mmapped pagecache. Add buffers and journal it. There | |
2754 | * doesn't seem much point in redirtying the page here. | |
2755 | */ | |
3f0ca309 | 2756 | return __ext4_journalled_writepage(page, len); |
43ce1d23 | 2757 | |
a42afc5f | 2758 | if (buffer_uninit(page_bufs)) { |
744692dc JZ |
2759 | ext4_set_bh_endio(page_bufs, inode); |
2760 | ret = block_write_full_page_endio(page, noalloc_get_block_write, | |
2761 | wbc, ext4_end_io_buffer_write); | |
2762 | } else | |
b920c755 TT |
2763 | ret = block_write_full_page(page, noalloc_get_block_write, |
2764 | wbc); | |
64769240 | 2765 | |
64769240 AT |
2766 | return ret; |
2767 | } | |
2768 | ||
61628a3f | 2769 | /* |
525f4ed8 MC |
2770 | * This is called via ext4_da_writepages() to |
2771 | * calulate the total number of credits to reserve to fit | |
2772 | * a single extent allocation into a single transaction, | |
2773 | * ext4_da_writpeages() will loop calling this before | |
2774 | * the block allocation. | |
61628a3f | 2775 | */ |
525f4ed8 MC |
2776 | |
2777 | static int ext4_da_writepages_trans_blocks(struct inode *inode) | |
2778 | { | |
2779 | int max_blocks = EXT4_I(inode)->i_reserved_data_blocks; | |
2780 | ||
2781 | /* | |
2782 | * With non-extent format the journal credit needed to | |
2783 | * insert nrblocks contiguous block is dependent on | |
2784 | * number of contiguous block. So we will limit | |
2785 | * number of contiguous block to a sane value | |
2786 | */ | |
12e9b892 | 2787 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) && |
525f4ed8 MC |
2788 | (max_blocks > EXT4_MAX_TRANS_DATA)) |
2789 | max_blocks = EXT4_MAX_TRANS_DATA; | |
2790 | ||
2791 | return ext4_chunk_trans_blocks(inode, max_blocks); | |
2792 | } | |
61628a3f | 2793 | |
8e48dcfb TT |
2794 | /* |
2795 | * write_cache_pages_da - walk the list of dirty pages of the given | |
2796 | * address space and call the callback function (which usually writes | |
2797 | * the pages). | |
2798 | * | |
2799 | * This is a forked version of write_cache_pages(). Differences: | |
2800 | * Range cyclic is ignored. | |
2801 | * no_nrwrite_index_update is always presumed true | |
2802 | */ | |
2803 | static int write_cache_pages_da(struct address_space *mapping, | |
2804 | struct writeback_control *wbc, | |
72f84e65 ES |
2805 | struct mpage_da_data *mpd, |
2806 | pgoff_t *done_index) | |
8e48dcfb TT |
2807 | { |
2808 | int ret = 0; | |
2809 | int done = 0; | |
2810 | struct pagevec pvec; | |
72f84e65 | 2811 | unsigned nr_pages; |
8e48dcfb TT |
2812 | pgoff_t index; |
2813 | pgoff_t end; /* Inclusive */ | |
2814 | long nr_to_write = wbc->nr_to_write; | |
5b41d924 | 2815 | int tag; |
8e48dcfb TT |
2816 | |
2817 | pagevec_init(&pvec, 0); | |
2818 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
2819 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
2820 | ||
5b41d924 ES |
2821 | if (wbc->sync_mode == WB_SYNC_ALL) |
2822 | tag = PAGECACHE_TAG_TOWRITE; | |
2823 | else | |
2824 | tag = PAGECACHE_TAG_DIRTY; | |
2825 | ||
72f84e65 | 2826 | *done_index = index; |
8e48dcfb TT |
2827 | while (!done && (index <= end)) { |
2828 | int i; | |
2829 | ||
5b41d924 | 2830 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, |
8e48dcfb TT |
2831 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); |
2832 | if (nr_pages == 0) | |
2833 | break; | |
2834 | ||
2835 | for (i = 0; i < nr_pages; i++) { | |
2836 | struct page *page = pvec.pages[i]; | |
2837 | ||
2838 | /* | |
2839 | * At this point, the page may be truncated or | |
2840 | * invalidated (changing page->mapping to NULL), or | |
2841 | * even swizzled back from swapper_space to tmpfs file | |
2842 | * mapping. However, page->index will not change | |
2843 | * because we have a reference on the page. | |
2844 | */ | |
2845 | if (page->index > end) { | |
2846 | done = 1; | |
2847 | break; | |
2848 | } | |
2849 | ||
72f84e65 ES |
2850 | *done_index = page->index + 1; |
2851 | ||
8e48dcfb TT |
2852 | lock_page(page); |
2853 | ||
2854 | /* | |
2855 | * Page truncated or invalidated. We can freely skip it | |
2856 | * then, even for data integrity operations: the page | |
2857 | * has disappeared concurrently, so there could be no | |
2858 | * real expectation of this data interity operation | |
2859 | * even if there is now a new, dirty page at the same | |
2860 | * pagecache address. | |
2861 | */ | |
2862 | if (unlikely(page->mapping != mapping)) { | |
2863 | continue_unlock: | |
2864 | unlock_page(page); | |
2865 | continue; | |
2866 | } | |
2867 | ||
2868 | if (!PageDirty(page)) { | |
2869 | /* someone wrote it for us */ | |
2870 | goto continue_unlock; | |
2871 | } | |
2872 | ||
2873 | if (PageWriteback(page)) { | |
2874 | if (wbc->sync_mode != WB_SYNC_NONE) | |
2875 | wait_on_page_writeback(page); | |
2876 | else | |
2877 | goto continue_unlock; | |
2878 | } | |
2879 | ||
2880 | BUG_ON(PageWriteback(page)); | |
2881 | if (!clear_page_dirty_for_io(page)) | |
2882 | goto continue_unlock; | |
2883 | ||
2884 | ret = __mpage_da_writepage(page, wbc, mpd); | |
2885 | if (unlikely(ret)) { | |
2886 | if (ret == AOP_WRITEPAGE_ACTIVATE) { | |
2887 | unlock_page(page); | |
2888 | ret = 0; | |
2889 | } else { | |
2890 | done = 1; | |
2891 | break; | |
2892 | } | |
2893 | } | |
2894 | ||
2895 | if (nr_to_write > 0) { | |
2896 | nr_to_write--; | |
2897 | if (nr_to_write == 0 && | |
2898 | wbc->sync_mode == WB_SYNC_NONE) { | |
2899 | /* | |
2900 | * We stop writing back only if we are | |
2901 | * not doing integrity sync. In case of | |
2902 | * integrity sync we have to keep going | |
2903 | * because someone may be concurrently | |
2904 | * dirtying pages, and we might have | |
2905 | * synced a lot of newly appeared dirty | |
2906 | * pages, but have not synced all of the | |
2907 | * old dirty pages. | |
2908 | */ | |
2909 | done = 1; | |
2910 | break; | |
2911 | } | |
2912 | } | |
2913 | } | |
2914 | pagevec_release(&pvec); | |
2915 | cond_resched(); | |
2916 | } | |
2917 | return ret; | |
2918 | } | |
2919 | ||
2920 | ||
64769240 | 2921 | static int ext4_da_writepages(struct address_space *mapping, |
a1d6cc56 | 2922 | struct writeback_control *wbc) |
64769240 | 2923 | { |
22208ded AK |
2924 | pgoff_t index; |
2925 | int range_whole = 0; | |
61628a3f | 2926 | handle_t *handle = NULL; |
df22291f | 2927 | struct mpage_da_data mpd; |
5e745b04 | 2928 | struct inode *inode = mapping->host; |
498e5f24 TT |
2929 | int pages_written = 0; |
2930 | long pages_skipped; | |
55138e0b | 2931 | unsigned int max_pages; |
2acf2c26 | 2932 | int range_cyclic, cycled = 1, io_done = 0; |
55138e0b TT |
2933 | int needed_blocks, ret = 0; |
2934 | long desired_nr_to_write, nr_to_writebump = 0; | |
de89de6e | 2935 | loff_t range_start = wbc->range_start; |
5e745b04 | 2936 | struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb); |
72f84e65 | 2937 | pgoff_t done_index = 0; |
5b41d924 | 2938 | pgoff_t end; |
61628a3f | 2939 | |
9bffad1e | 2940 | trace_ext4_da_writepages(inode, wbc); |
ba80b101 | 2941 | |
61628a3f MC |
2942 | /* |
2943 | * No pages to write? This is mainly a kludge to avoid starting | |
2944 | * a transaction for special inodes like journal inode on last iput() | |
2945 | * because that could violate lock ordering on umount | |
2946 | */ | |
a1d6cc56 | 2947 | if (!mapping->nrpages || !mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) |
61628a3f | 2948 | return 0; |
2a21e37e TT |
2949 | |
2950 | /* | |
2951 | * If the filesystem has aborted, it is read-only, so return | |
2952 | * right away instead of dumping stack traces later on that | |
2953 | * will obscure the real source of the problem. We test | |
4ab2f15b | 2954 | * EXT4_MF_FS_ABORTED instead of sb->s_flag's MS_RDONLY because |
2a21e37e TT |
2955 | * the latter could be true if the filesystem is mounted |
2956 | * read-only, and in that case, ext4_da_writepages should | |
2957 | * *never* be called, so if that ever happens, we would want | |
2958 | * the stack trace. | |
2959 | */ | |
4ab2f15b | 2960 | if (unlikely(sbi->s_mount_flags & EXT4_MF_FS_ABORTED)) |
2a21e37e TT |
2961 | return -EROFS; |
2962 | ||
22208ded AK |
2963 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
2964 | range_whole = 1; | |
61628a3f | 2965 | |
2acf2c26 AK |
2966 | range_cyclic = wbc->range_cyclic; |
2967 | if (wbc->range_cyclic) { | |
22208ded | 2968 | index = mapping->writeback_index; |
2acf2c26 AK |
2969 | if (index) |
2970 | cycled = 0; | |
2971 | wbc->range_start = index << PAGE_CACHE_SHIFT; | |
2972 | wbc->range_end = LLONG_MAX; | |
2973 | wbc->range_cyclic = 0; | |
5b41d924 ES |
2974 | end = -1; |
2975 | } else { | |
22208ded | 2976 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
5b41d924 ES |
2977 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
2978 | } | |
a1d6cc56 | 2979 | |
55138e0b TT |
2980 | /* |
2981 | * This works around two forms of stupidity. The first is in | |
2982 | * the writeback code, which caps the maximum number of pages | |
2983 | * written to be 1024 pages. This is wrong on multiple | |
2984 | * levels; different architectues have a different page size, | |
2985 | * which changes the maximum amount of data which gets | |
2986 | * written. Secondly, 4 megabytes is way too small. XFS | |
2987 | * forces this value to be 16 megabytes by multiplying | |
2988 | * nr_to_write parameter by four, and then relies on its | |
2989 | * allocator to allocate larger extents to make them | |
2990 | * contiguous. Unfortunately this brings us to the second | |
2991 | * stupidity, which is that ext4's mballoc code only allocates | |
2992 | * at most 2048 blocks. So we force contiguous writes up to | |
2993 | * the number of dirty blocks in the inode, or | |
2994 | * sbi->max_writeback_mb_bump whichever is smaller. | |
2995 | */ | |
2996 | max_pages = sbi->s_max_writeback_mb_bump << (20 - PAGE_CACHE_SHIFT); | |
b443e733 ES |
2997 | if (!range_cyclic && range_whole) { |
2998 | if (wbc->nr_to_write == LONG_MAX) | |
2999 | desired_nr_to_write = wbc->nr_to_write; | |
3000 | else | |
3001 | desired_nr_to_write = wbc->nr_to_write * 8; | |
3002 | } else | |
55138e0b TT |
3003 | desired_nr_to_write = ext4_num_dirty_pages(inode, index, |
3004 | max_pages); | |
3005 | if (desired_nr_to_write > max_pages) | |
3006 | desired_nr_to_write = max_pages; | |
3007 | ||
3008 | if (wbc->nr_to_write < desired_nr_to_write) { | |
3009 | nr_to_writebump = desired_nr_to_write - wbc->nr_to_write; | |
3010 | wbc->nr_to_write = desired_nr_to_write; | |
3011 | } | |
3012 | ||
df22291f AK |
3013 | mpd.wbc = wbc; |
3014 | mpd.inode = mapping->host; | |
3015 | ||
22208ded AK |
3016 | pages_skipped = wbc->pages_skipped; |
3017 | ||
2acf2c26 | 3018 | retry: |
5b41d924 ES |
3019 | if (wbc->sync_mode == WB_SYNC_ALL) |
3020 | tag_pages_for_writeback(mapping, index, end); | |
3021 | ||
22208ded | 3022 | while (!ret && wbc->nr_to_write > 0) { |
a1d6cc56 AK |
3023 | |
3024 | /* | |
3025 | * we insert one extent at a time. So we need | |
3026 | * credit needed for single extent allocation. | |
3027 | * journalled mode is currently not supported | |
3028 | * by delalloc | |
3029 | */ | |
3030 | BUG_ON(ext4_should_journal_data(inode)); | |
525f4ed8 | 3031 | needed_blocks = ext4_da_writepages_trans_blocks(inode); |
a1d6cc56 | 3032 | |
61628a3f MC |
3033 | /* start a new transaction*/ |
3034 | handle = ext4_journal_start(inode, needed_blocks); | |
3035 | if (IS_ERR(handle)) { | |
3036 | ret = PTR_ERR(handle); | |
1693918e | 3037 | ext4_msg(inode->i_sb, KERN_CRIT, "%s: jbd2_start: " |
fbe845dd | 3038 | "%ld pages, ino %lu; err %d", __func__, |
a1d6cc56 | 3039 | wbc->nr_to_write, inode->i_ino, ret); |
61628a3f MC |
3040 | goto out_writepages; |
3041 | } | |
f63e6005 TT |
3042 | |
3043 | /* | |
3044 | * Now call __mpage_da_writepage to find the next | |
3045 | * contiguous region of logical blocks that need | |
3046 | * blocks to be allocated by ext4. We don't actually | |
3047 | * submit the blocks for I/O here, even though | |
3048 | * write_cache_pages thinks it will, and will set the | |
3049 | * pages as clean for write before calling | |
3050 | * __mpage_da_writepage(). | |
3051 | */ | |
3052 | mpd.b_size = 0; | |
3053 | mpd.b_state = 0; | |
3054 | mpd.b_blocknr = 0; | |
3055 | mpd.first_page = 0; | |
3056 | mpd.next_page = 0; | |
3057 | mpd.io_done = 0; | |
3058 | mpd.pages_written = 0; | |
3059 | mpd.retval = 0; | |
72f84e65 | 3060 | ret = write_cache_pages_da(mapping, wbc, &mpd, &done_index); |
f63e6005 | 3061 | /* |
af901ca1 | 3062 | * If we have a contiguous extent of pages and we |
f63e6005 TT |
3063 | * haven't done the I/O yet, map the blocks and submit |
3064 | * them for I/O. | |
3065 | */ | |
3066 | if (!mpd.io_done && mpd.next_page != mpd.first_page) { | |
5a87b7a5 | 3067 | mpage_da_map_and_submit(&mpd); |
f63e6005 TT |
3068 | ret = MPAGE_DA_EXTENT_TAIL; |
3069 | } | |
b3a3ca8c | 3070 | trace_ext4_da_write_pages(inode, &mpd); |
f63e6005 | 3071 | wbc->nr_to_write -= mpd.pages_written; |
df22291f | 3072 | |
61628a3f | 3073 | ext4_journal_stop(handle); |
df22291f | 3074 | |
8f64b32e | 3075 | if ((mpd.retval == -ENOSPC) && sbi->s_journal) { |
22208ded AK |
3076 | /* commit the transaction which would |
3077 | * free blocks released in the transaction | |
3078 | * and try again | |
3079 | */ | |
df22291f | 3080 | jbd2_journal_force_commit_nested(sbi->s_journal); |
22208ded AK |
3081 | wbc->pages_skipped = pages_skipped; |
3082 | ret = 0; | |
3083 | } else if (ret == MPAGE_DA_EXTENT_TAIL) { | |
a1d6cc56 AK |
3084 | /* |
3085 | * got one extent now try with | |
3086 | * rest of the pages | |
3087 | */ | |
22208ded AK |
3088 | pages_written += mpd.pages_written; |
3089 | wbc->pages_skipped = pages_skipped; | |
a1d6cc56 | 3090 | ret = 0; |
2acf2c26 | 3091 | io_done = 1; |
22208ded | 3092 | } else if (wbc->nr_to_write) |
61628a3f MC |
3093 | /* |
3094 | * There is no more writeout needed | |
3095 | * or we requested for a noblocking writeout | |
3096 | * and we found the device congested | |
3097 | */ | |
61628a3f | 3098 | break; |
a1d6cc56 | 3099 | } |
2acf2c26 AK |
3100 | if (!io_done && !cycled) { |
3101 | cycled = 1; | |
3102 | index = 0; | |
3103 | wbc->range_start = index << PAGE_CACHE_SHIFT; | |
3104 | wbc->range_end = mapping->writeback_index - 1; | |
3105 | goto retry; | |
3106 | } | |
22208ded | 3107 | if (pages_skipped != wbc->pages_skipped) |
1693918e TT |
3108 | ext4_msg(inode->i_sb, KERN_CRIT, |
3109 | "This should not happen leaving %s " | |
fbe845dd | 3110 | "with nr_to_write = %ld ret = %d", |
1693918e | 3111 | __func__, wbc->nr_to_write, ret); |
22208ded AK |
3112 | |
3113 | /* Update index */ | |
2acf2c26 | 3114 | wbc->range_cyclic = range_cyclic; |
22208ded AK |
3115 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
3116 | /* | |
3117 | * set the writeback_index so that range_cyclic | |
3118 | * mode will write it back later | |
3119 | */ | |
72f84e65 | 3120 | mapping->writeback_index = done_index; |
a1d6cc56 | 3121 | |
61628a3f | 3122 | out_writepages: |
2faf2e19 | 3123 | wbc->nr_to_write -= nr_to_writebump; |
de89de6e | 3124 | wbc->range_start = range_start; |
9bffad1e | 3125 | trace_ext4_da_writepages_result(inode, wbc, ret, pages_written); |
61628a3f | 3126 | return ret; |
64769240 AT |
3127 | } |
3128 | ||
79f0be8d AK |
3129 | #define FALL_BACK_TO_NONDELALLOC 1 |
3130 | static int ext4_nonda_switch(struct super_block *sb) | |
3131 | { | |
3132 | s64 free_blocks, dirty_blocks; | |
3133 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
3134 | ||
3135 | /* | |
3136 | * switch to non delalloc mode if we are running low | |
3137 | * on free block. The free block accounting via percpu | |
179f7ebf | 3138 | * counters can get slightly wrong with percpu_counter_batch getting |
79f0be8d AK |
3139 | * accumulated on each CPU without updating global counters |
3140 | * Delalloc need an accurate free block accounting. So switch | |
3141 | * to non delalloc when we are near to error range. | |
3142 | */ | |
3143 | free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter); | |
3144 | dirty_blocks = percpu_counter_read_positive(&sbi->s_dirtyblocks_counter); | |
3145 | if (2 * free_blocks < 3 * dirty_blocks || | |
3146 | free_blocks < (dirty_blocks + EXT4_FREEBLOCKS_WATERMARK)) { | |
3147 | /* | |
c8afb446 ES |
3148 | * free block count is less than 150% of dirty blocks |
3149 | * or free blocks is less than watermark | |
79f0be8d AK |
3150 | */ |
3151 | return 1; | |
3152 | } | |
c8afb446 ES |
3153 | /* |
3154 | * Even if we don't switch but are nearing capacity, | |
3155 | * start pushing delalloc when 1/2 of free blocks are dirty. | |
3156 | */ | |
3157 | if (free_blocks < 2 * dirty_blocks) | |
3158 | writeback_inodes_sb_if_idle(sb); | |
3159 | ||
79f0be8d AK |
3160 | return 0; |
3161 | } | |
3162 | ||
64769240 | 3163 | static int ext4_da_write_begin(struct file *file, struct address_space *mapping, |
de9a55b8 TT |
3164 | loff_t pos, unsigned len, unsigned flags, |
3165 | struct page **pagep, void **fsdata) | |
64769240 | 3166 | { |
72b8ab9d | 3167 | int ret, retries = 0; |
64769240 AT |
3168 | struct page *page; |
3169 | pgoff_t index; | |
64769240 AT |
3170 | struct inode *inode = mapping->host; |
3171 | handle_t *handle; | |
3172 | ||
3173 | index = pos >> PAGE_CACHE_SHIFT; | |
79f0be8d AK |
3174 | |
3175 | if (ext4_nonda_switch(inode->i_sb)) { | |
3176 | *fsdata = (void *)FALL_BACK_TO_NONDELALLOC; | |
3177 | return ext4_write_begin(file, mapping, pos, | |
3178 | len, flags, pagep, fsdata); | |
3179 | } | |
3180 | *fsdata = (void *)0; | |
9bffad1e | 3181 | trace_ext4_da_write_begin(inode, pos, len, flags); |
d2a17637 | 3182 | retry: |
64769240 AT |
3183 | /* |
3184 | * With delayed allocation, we don't log the i_disksize update | |
3185 | * if there is delayed block allocation. But we still need | |
3186 | * to journalling the i_disksize update if writes to the end | |
3187 | * of file which has an already mapped buffer. | |
3188 | */ | |
3189 | handle = ext4_journal_start(inode, 1); | |
3190 | if (IS_ERR(handle)) { | |
3191 | ret = PTR_ERR(handle); | |
3192 | goto out; | |
3193 | } | |
ebd3610b JK |
3194 | /* We cannot recurse into the filesystem as the transaction is already |
3195 | * started */ | |
3196 | flags |= AOP_FLAG_NOFS; | |
64769240 | 3197 | |
54566b2c | 3198 | page = grab_cache_page_write_begin(mapping, index, flags); |
d5a0d4f7 ES |
3199 | if (!page) { |
3200 | ext4_journal_stop(handle); | |
3201 | ret = -ENOMEM; | |
3202 | goto out; | |
3203 | } | |
64769240 AT |
3204 | *pagep = page; |
3205 | ||
6e1db88d | 3206 | ret = __block_write_begin(page, pos, len, ext4_da_get_block_prep); |
64769240 AT |
3207 | if (ret < 0) { |
3208 | unlock_page(page); | |
3209 | ext4_journal_stop(handle); | |
3210 | page_cache_release(page); | |
ae4d5372 AK |
3211 | /* |
3212 | * block_write_begin may have instantiated a few blocks | |
3213 | * outside i_size. Trim these off again. Don't need | |
3214 | * i_size_read because we hold i_mutex. | |
3215 | */ | |
3216 | if (pos + len > inode->i_size) | |
b9a4207d | 3217 | ext4_truncate_failed_write(inode); |
64769240 AT |
3218 | } |
3219 | ||
d2a17637 MC |
3220 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) |
3221 | goto retry; | |
64769240 AT |
3222 | out: |
3223 | return ret; | |
3224 | } | |
3225 | ||
632eaeab MC |
3226 | /* |
3227 | * Check if we should update i_disksize | |
3228 | * when write to the end of file but not require block allocation | |
3229 | */ | |
3230 | static int ext4_da_should_update_i_disksize(struct page *page, | |
de9a55b8 | 3231 | unsigned long offset) |
632eaeab MC |
3232 | { |
3233 | struct buffer_head *bh; | |
3234 | struct inode *inode = page->mapping->host; | |
3235 | unsigned int idx; | |
3236 | int i; | |
3237 | ||
3238 | bh = page_buffers(page); | |
3239 | idx = offset >> inode->i_blkbits; | |
3240 | ||
af5bc92d | 3241 | for (i = 0; i < idx; i++) |
632eaeab MC |
3242 | bh = bh->b_this_page; |
3243 | ||
29fa89d0 | 3244 | if (!buffer_mapped(bh) || (buffer_delay(bh)) || buffer_unwritten(bh)) |
632eaeab MC |
3245 | return 0; |
3246 | return 1; | |
3247 | } | |
3248 | ||
64769240 | 3249 | static int ext4_da_write_end(struct file *file, |
de9a55b8 TT |
3250 | struct address_space *mapping, |
3251 | loff_t pos, unsigned len, unsigned copied, | |
3252 | struct page *page, void *fsdata) | |
64769240 AT |
3253 | { |
3254 | struct inode *inode = mapping->host; | |
3255 | int ret = 0, ret2; | |
3256 | handle_t *handle = ext4_journal_current_handle(); | |
3257 | loff_t new_i_size; | |
632eaeab | 3258 | unsigned long start, end; |
79f0be8d AK |
3259 | int write_mode = (int)(unsigned long)fsdata; |
3260 | ||
3261 | if (write_mode == FALL_BACK_TO_NONDELALLOC) { | |
3262 | if (ext4_should_order_data(inode)) { | |
3263 | return ext4_ordered_write_end(file, mapping, pos, | |
3264 | len, copied, page, fsdata); | |
3265 | } else if (ext4_should_writeback_data(inode)) { | |
3266 | return ext4_writeback_write_end(file, mapping, pos, | |
3267 | len, copied, page, fsdata); | |
3268 | } else { | |
3269 | BUG(); | |
3270 | } | |
3271 | } | |
632eaeab | 3272 | |
9bffad1e | 3273 | trace_ext4_da_write_end(inode, pos, len, copied); |
632eaeab | 3274 | start = pos & (PAGE_CACHE_SIZE - 1); |
af5bc92d | 3275 | end = start + copied - 1; |
64769240 AT |
3276 | |
3277 | /* | |
3278 | * generic_write_end() will run mark_inode_dirty() if i_size | |
3279 | * changes. So let's piggyback the i_disksize mark_inode_dirty | |
3280 | * into that. | |
3281 | */ | |
3282 | ||
3283 | new_i_size = pos + copied; | |
632eaeab MC |
3284 | if (new_i_size > EXT4_I(inode)->i_disksize) { |
3285 | if (ext4_da_should_update_i_disksize(page, end)) { | |
3286 | down_write(&EXT4_I(inode)->i_data_sem); | |
3287 | if (new_i_size > EXT4_I(inode)->i_disksize) { | |
3288 | /* | |
3289 | * Updating i_disksize when extending file | |
3290 | * without needing block allocation | |
3291 | */ | |
3292 | if (ext4_should_order_data(inode)) | |
3293 | ret = ext4_jbd2_file_inode(handle, | |
3294 | inode); | |
64769240 | 3295 | |
632eaeab MC |
3296 | EXT4_I(inode)->i_disksize = new_i_size; |
3297 | } | |
3298 | up_write(&EXT4_I(inode)->i_data_sem); | |
cf17fea6 AK |
3299 | /* We need to mark inode dirty even if |
3300 | * new_i_size is less that inode->i_size | |
3301 | * bu greater than i_disksize.(hint delalloc) | |
3302 | */ | |
3303 | ext4_mark_inode_dirty(handle, inode); | |
64769240 | 3304 | } |
632eaeab | 3305 | } |
64769240 AT |
3306 | ret2 = generic_write_end(file, mapping, pos, len, copied, |
3307 | page, fsdata); | |
3308 | copied = ret2; | |
3309 | if (ret2 < 0) | |
3310 | ret = ret2; | |
3311 | ret2 = ext4_journal_stop(handle); | |
3312 | if (!ret) | |
3313 | ret = ret2; | |
3314 | ||
3315 | return ret ? ret : copied; | |
3316 | } | |
3317 | ||
3318 | static void ext4_da_invalidatepage(struct page *page, unsigned long offset) | |
3319 | { | |
64769240 AT |
3320 | /* |
3321 | * Drop reserved blocks | |
3322 | */ | |
3323 | BUG_ON(!PageLocked(page)); | |
3324 | if (!page_has_buffers(page)) | |
3325 | goto out; | |
3326 | ||
d2a17637 | 3327 | ext4_da_page_release_reservation(page, offset); |
64769240 AT |
3328 | |
3329 | out: | |
3330 | ext4_invalidatepage(page, offset); | |
3331 | ||
3332 | return; | |
3333 | } | |
3334 | ||
ccd2506b TT |
3335 | /* |
3336 | * Force all delayed allocation blocks to be allocated for a given inode. | |
3337 | */ | |
3338 | int ext4_alloc_da_blocks(struct inode *inode) | |
3339 | { | |
fb40ba0d TT |
3340 | trace_ext4_alloc_da_blocks(inode); |
3341 | ||
ccd2506b TT |
3342 | if (!EXT4_I(inode)->i_reserved_data_blocks && |
3343 | !EXT4_I(inode)->i_reserved_meta_blocks) | |
3344 | return 0; | |
3345 | ||
3346 | /* | |
3347 | * We do something simple for now. The filemap_flush() will | |
3348 | * also start triggering a write of the data blocks, which is | |
3349 | * not strictly speaking necessary (and for users of | |
3350 | * laptop_mode, not even desirable). However, to do otherwise | |
3351 | * would require replicating code paths in: | |
de9a55b8 | 3352 | * |
ccd2506b TT |
3353 | * ext4_da_writepages() -> |
3354 | * write_cache_pages() ---> (via passed in callback function) | |
3355 | * __mpage_da_writepage() --> | |
3356 | * mpage_add_bh_to_extent() | |
3357 | * mpage_da_map_blocks() | |
3358 | * | |
3359 | * The problem is that write_cache_pages(), located in | |
3360 | * mm/page-writeback.c, marks pages clean in preparation for | |
3361 | * doing I/O, which is not desirable if we're not planning on | |
3362 | * doing I/O at all. | |
3363 | * | |
3364 | * We could call write_cache_pages(), and then redirty all of | |
3365 | * the pages by calling redirty_page_for_writeback() but that | |
3366 | * would be ugly in the extreme. So instead we would need to | |
3367 | * replicate parts of the code in the above functions, | |
3368 | * simplifying them becuase we wouldn't actually intend to | |
3369 | * write out the pages, but rather only collect contiguous | |
3370 | * logical block extents, call the multi-block allocator, and | |
3371 | * then update the buffer heads with the block allocations. | |
de9a55b8 | 3372 | * |
ccd2506b TT |
3373 | * For now, though, we'll cheat by calling filemap_flush(), |
3374 | * which will map the blocks, and start the I/O, but not | |
3375 | * actually wait for the I/O to complete. | |
3376 | */ | |
3377 | return filemap_flush(inode->i_mapping); | |
3378 | } | |
64769240 | 3379 | |
ac27a0ec DK |
3380 | /* |
3381 | * bmap() is special. It gets used by applications such as lilo and by | |
3382 | * the swapper to find the on-disk block of a specific piece of data. | |
3383 | * | |
3384 | * Naturally, this is dangerous if the block concerned is still in the | |
617ba13b | 3385 | * journal. If somebody makes a swapfile on an ext4 data-journaling |
ac27a0ec DK |
3386 | * filesystem and enables swap, then they may get a nasty shock when the |
3387 | * data getting swapped to that swapfile suddenly gets overwritten by | |
3388 | * the original zero's written out previously to the journal and | |
3389 | * awaiting writeback in the kernel's buffer cache. | |
3390 | * | |
3391 | * So, if we see any bmap calls here on a modified, data-journaled file, | |
3392 | * take extra steps to flush any blocks which might be in the cache. | |
3393 | */ | |
617ba13b | 3394 | static sector_t ext4_bmap(struct address_space *mapping, sector_t block) |
ac27a0ec DK |
3395 | { |
3396 | struct inode *inode = mapping->host; | |
3397 | journal_t *journal; | |
3398 | int err; | |
3399 | ||
64769240 AT |
3400 | if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) && |
3401 | test_opt(inode->i_sb, DELALLOC)) { | |
3402 | /* | |
3403 | * With delalloc we want to sync the file | |
3404 | * so that we can make sure we allocate | |
3405 | * blocks for file | |
3406 | */ | |
3407 | filemap_write_and_wait(mapping); | |
3408 | } | |
3409 | ||
19f5fb7a TT |
3410 | if (EXT4_JOURNAL(inode) && |
3411 | ext4_test_inode_state(inode, EXT4_STATE_JDATA)) { | |
ac27a0ec DK |
3412 | /* |
3413 | * This is a REALLY heavyweight approach, but the use of | |
3414 | * bmap on dirty files is expected to be extremely rare: | |
3415 | * only if we run lilo or swapon on a freshly made file | |
3416 | * do we expect this to happen. | |
3417 | * | |
3418 | * (bmap requires CAP_SYS_RAWIO so this does not | |
3419 | * represent an unprivileged user DOS attack --- we'd be | |
3420 | * in trouble if mortal users could trigger this path at | |
3421 | * will.) | |
3422 | * | |
617ba13b | 3423 | * NB. EXT4_STATE_JDATA is not set on files other than |
ac27a0ec DK |
3424 | * regular files. If somebody wants to bmap a directory |
3425 | * or symlink and gets confused because the buffer | |
3426 | * hasn't yet been flushed to disk, they deserve | |
3427 | * everything they get. | |
3428 | */ | |
3429 | ||
19f5fb7a | 3430 | ext4_clear_inode_state(inode, EXT4_STATE_JDATA); |
617ba13b | 3431 | journal = EXT4_JOURNAL(inode); |
dab291af MC |
3432 | jbd2_journal_lock_updates(journal); |
3433 | err = jbd2_journal_flush(journal); | |
3434 | jbd2_journal_unlock_updates(journal); | |
ac27a0ec DK |
3435 | |
3436 | if (err) | |
3437 | return 0; | |
3438 | } | |
3439 | ||
af5bc92d | 3440 | return generic_block_bmap(mapping, block, ext4_get_block); |
ac27a0ec DK |
3441 | } |
3442 | ||
617ba13b | 3443 | static int ext4_readpage(struct file *file, struct page *page) |
ac27a0ec | 3444 | { |
617ba13b | 3445 | return mpage_readpage(page, ext4_get_block); |
ac27a0ec DK |
3446 | } |
3447 | ||
3448 | static int | |
617ba13b | 3449 | ext4_readpages(struct file *file, struct address_space *mapping, |
ac27a0ec DK |
3450 | struct list_head *pages, unsigned nr_pages) |
3451 | { | |
617ba13b | 3452 | return mpage_readpages(mapping, pages, nr_pages, ext4_get_block); |
ac27a0ec DK |
3453 | } |
3454 | ||
744692dc JZ |
3455 | static void ext4_invalidatepage_free_endio(struct page *page, unsigned long offset) |
3456 | { | |
3457 | struct buffer_head *head, *bh; | |
3458 | unsigned int curr_off = 0; | |
3459 | ||
3460 | if (!page_has_buffers(page)) | |
3461 | return; | |
3462 | head = bh = page_buffers(page); | |
3463 | do { | |
3464 | if (offset <= curr_off && test_clear_buffer_uninit(bh) | |
3465 | && bh->b_private) { | |
3466 | ext4_free_io_end(bh->b_private); | |
3467 | bh->b_private = NULL; | |
3468 | bh->b_end_io = NULL; | |
3469 | } | |
3470 | curr_off = curr_off + bh->b_size; | |
3471 | bh = bh->b_this_page; | |
3472 | } while (bh != head); | |
3473 | } | |
3474 | ||
617ba13b | 3475 | static void ext4_invalidatepage(struct page *page, unsigned long offset) |
ac27a0ec | 3476 | { |
617ba13b | 3477 | journal_t *journal = EXT4_JOURNAL(page->mapping->host); |
ac27a0ec | 3478 | |
744692dc JZ |
3479 | /* |
3480 | * free any io_end structure allocated for buffers to be discarded | |
3481 | */ | |
3482 | if (ext4_should_dioread_nolock(page->mapping->host)) | |
3483 | ext4_invalidatepage_free_endio(page, offset); | |
ac27a0ec DK |
3484 | /* |
3485 | * If it's a full truncate we just forget about the pending dirtying | |
3486 | */ | |
3487 | if (offset == 0) | |
3488 | ClearPageChecked(page); | |
3489 | ||
0390131b FM |
3490 | if (journal) |
3491 | jbd2_journal_invalidatepage(journal, page, offset); | |
3492 | else | |
3493 | block_invalidatepage(page, offset); | |
ac27a0ec DK |
3494 | } |
3495 | ||
617ba13b | 3496 | static int ext4_releasepage(struct page *page, gfp_t wait) |
ac27a0ec | 3497 | { |
617ba13b | 3498 | journal_t *journal = EXT4_JOURNAL(page->mapping->host); |
ac27a0ec DK |
3499 | |
3500 | WARN_ON(PageChecked(page)); | |
3501 | if (!page_has_buffers(page)) | |
3502 | return 0; | |
0390131b FM |
3503 | if (journal) |
3504 | return jbd2_journal_try_to_free_buffers(journal, page, wait); | |
3505 | else | |
3506 | return try_to_free_buffers(page); | |
ac27a0ec DK |
3507 | } |
3508 | ||
3509 | /* | |
4c0425ff MC |
3510 | * O_DIRECT for ext3 (or indirect map) based files |
3511 | * | |
ac27a0ec DK |
3512 | * If the O_DIRECT write will extend the file then add this inode to the |
3513 | * orphan list. So recovery will truncate it back to the original size | |
3514 | * if the machine crashes during the write. | |
3515 | * | |
3516 | * If the O_DIRECT write is intantiating holes inside i_size and the machine | |
7fb5409d JK |
3517 | * crashes then stale disk data _may_ be exposed inside the file. But current |
3518 | * VFS code falls back into buffered path in that case so we are safe. | |
ac27a0ec | 3519 | */ |
4c0425ff | 3520 | static ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb, |
de9a55b8 TT |
3521 | const struct iovec *iov, loff_t offset, |
3522 | unsigned long nr_segs) | |
ac27a0ec DK |
3523 | { |
3524 | struct file *file = iocb->ki_filp; | |
3525 | struct inode *inode = file->f_mapping->host; | |
617ba13b | 3526 | struct ext4_inode_info *ei = EXT4_I(inode); |
7fb5409d | 3527 | handle_t *handle; |
ac27a0ec DK |
3528 | ssize_t ret; |
3529 | int orphan = 0; | |
3530 | size_t count = iov_length(iov, nr_segs); | |
fbbf6945 | 3531 | int retries = 0; |
ac27a0ec DK |
3532 | |
3533 | if (rw == WRITE) { | |
3534 | loff_t final_size = offset + count; | |
3535 | ||
ac27a0ec | 3536 | if (final_size > inode->i_size) { |
7fb5409d JK |
3537 | /* Credits for sb + inode write */ |
3538 | handle = ext4_journal_start(inode, 2); | |
3539 | if (IS_ERR(handle)) { | |
3540 | ret = PTR_ERR(handle); | |
3541 | goto out; | |
3542 | } | |
617ba13b | 3543 | ret = ext4_orphan_add(handle, inode); |
7fb5409d JK |
3544 | if (ret) { |
3545 | ext4_journal_stop(handle); | |
3546 | goto out; | |
3547 | } | |
ac27a0ec DK |
3548 | orphan = 1; |
3549 | ei->i_disksize = inode->i_size; | |
7fb5409d | 3550 | ext4_journal_stop(handle); |
ac27a0ec DK |
3551 | } |
3552 | } | |
3553 | ||
fbbf6945 | 3554 | retry: |
b7adc1f3 | 3555 | if (rw == READ && ext4_should_dioread_nolock(inode)) |
eafdc7d1 | 3556 | ret = __blockdev_direct_IO(rw, iocb, inode, |
b7adc1f3 JZ |
3557 | inode->i_sb->s_bdev, iov, |
3558 | offset, nr_segs, | |
eafdc7d1 CH |
3559 | ext4_get_block, NULL, NULL, 0); |
3560 | else { | |
b7adc1f3 JZ |
3561 | ret = blockdev_direct_IO(rw, iocb, inode, |
3562 | inode->i_sb->s_bdev, iov, | |
ac27a0ec | 3563 | offset, nr_segs, |
617ba13b | 3564 | ext4_get_block, NULL); |
eafdc7d1 CH |
3565 | |
3566 | if (unlikely((rw & WRITE) && ret < 0)) { | |
3567 | loff_t isize = i_size_read(inode); | |
3568 | loff_t end = offset + iov_length(iov, nr_segs); | |
3569 | ||
3570 | if (end > isize) | |
3571 | vmtruncate(inode, isize); | |
3572 | } | |
3573 | } | |
fbbf6945 ES |
3574 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) |
3575 | goto retry; | |
ac27a0ec | 3576 | |
7fb5409d | 3577 | if (orphan) { |
ac27a0ec DK |
3578 | int err; |
3579 | ||
7fb5409d JK |
3580 | /* Credits for sb + inode write */ |
3581 | handle = ext4_journal_start(inode, 2); | |
3582 | if (IS_ERR(handle)) { | |
3583 | /* This is really bad luck. We've written the data | |
3584 | * but cannot extend i_size. Bail out and pretend | |
3585 | * the write failed... */ | |
3586 | ret = PTR_ERR(handle); | |
da1dafca DM |
3587 | if (inode->i_nlink) |
3588 | ext4_orphan_del(NULL, inode); | |
3589 | ||
7fb5409d JK |
3590 | goto out; |
3591 | } | |
3592 | if (inode->i_nlink) | |
617ba13b | 3593 | ext4_orphan_del(handle, inode); |
7fb5409d | 3594 | if (ret > 0) { |
ac27a0ec DK |
3595 | loff_t end = offset + ret; |
3596 | if (end > inode->i_size) { | |
3597 | ei->i_disksize = end; | |
3598 | i_size_write(inode, end); | |
3599 | /* | |
3600 | * We're going to return a positive `ret' | |
3601 | * here due to non-zero-length I/O, so there's | |
3602 | * no way of reporting error returns from | |
617ba13b | 3603 | * ext4_mark_inode_dirty() to userspace. So |
ac27a0ec DK |
3604 | * ignore it. |
3605 | */ | |
617ba13b | 3606 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
3607 | } |
3608 | } | |
617ba13b | 3609 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3610 | if (ret == 0) |
3611 | ret = err; | |
3612 | } | |
3613 | out: | |
3614 | return ret; | |
3615 | } | |
3616 | ||
2ed88685 TT |
3617 | /* |
3618 | * ext4_get_block used when preparing for a DIO write or buffer write. | |
3619 | * We allocate an uinitialized extent if blocks haven't been allocated. | |
3620 | * The extent will be converted to initialized after the IO is complete. | |
3621 | */ | |
c7064ef1 | 3622 | static int ext4_get_block_write(struct inode *inode, sector_t iblock, |
4c0425ff MC |
3623 | struct buffer_head *bh_result, int create) |
3624 | { | |
c7064ef1 | 3625 | ext4_debug("ext4_get_block_write: inode %lu, create flag %d\n", |
8d5d02e6 | 3626 | inode->i_ino, create); |
2ed88685 TT |
3627 | return _ext4_get_block(inode, iblock, bh_result, |
3628 | EXT4_GET_BLOCKS_IO_CREATE_EXT); | |
4c0425ff MC |
3629 | } |
3630 | ||
4c0425ff | 3631 | static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset, |
552ef802 CH |
3632 | ssize_t size, void *private, int ret, |
3633 | bool is_async) | |
4c0425ff MC |
3634 | { |
3635 | ext4_io_end_t *io_end = iocb->private; | |
3636 | struct workqueue_struct *wq; | |
744692dc JZ |
3637 | unsigned long flags; |
3638 | struct ext4_inode_info *ei; | |
4c0425ff | 3639 | |
4b70df18 M |
3640 | /* if not async direct IO or dio with 0 bytes write, just return */ |
3641 | if (!io_end || !size) | |
552ef802 | 3642 | goto out; |
4b70df18 | 3643 | |
8d5d02e6 MC |
3644 | ext_debug("ext4_end_io_dio(): io_end 0x%p" |
3645 | "for inode %lu, iocb 0x%p, offset %llu, size %llu\n", | |
3646 | iocb->private, io_end->inode->i_ino, iocb, offset, | |
3647 | size); | |
8d5d02e6 MC |
3648 | |
3649 | /* if not aio dio with unwritten extents, just free io and return */ | |
bd2d0210 | 3650 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) { |
8d5d02e6 MC |
3651 | ext4_free_io_end(io_end); |
3652 | iocb->private = NULL; | |
5b3ff237 JZ |
3653 | out: |
3654 | if (is_async) | |
3655 | aio_complete(iocb, ret, 0); | |
3656 | return; | |
8d5d02e6 MC |
3657 | } |
3658 | ||
4c0425ff MC |
3659 | io_end->offset = offset; |
3660 | io_end->size = size; | |
5b3ff237 JZ |
3661 | if (is_async) { |
3662 | io_end->iocb = iocb; | |
3663 | io_end->result = ret; | |
3664 | } | |
4c0425ff MC |
3665 | wq = EXT4_SB(io_end->inode->i_sb)->dio_unwritten_wq; |
3666 | ||
8d5d02e6 | 3667 | /* Add the io_end to per-inode completed aio dio list*/ |
744692dc JZ |
3668 | ei = EXT4_I(io_end->inode); |
3669 | spin_lock_irqsave(&ei->i_completed_io_lock, flags); | |
3670 | list_add_tail(&io_end->list, &ei->i_completed_io_list); | |
3671 | spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); | |
c999af2b ES |
3672 | |
3673 | /* queue the work to convert unwritten extents to written */ | |
3674 | queue_work(wq, &io_end->work); | |
4c0425ff MC |
3675 | iocb->private = NULL; |
3676 | } | |
c7064ef1 | 3677 | |
744692dc JZ |
3678 | static void ext4_end_io_buffer_write(struct buffer_head *bh, int uptodate) |
3679 | { | |
3680 | ext4_io_end_t *io_end = bh->b_private; | |
3681 | struct workqueue_struct *wq; | |
3682 | struct inode *inode; | |
3683 | unsigned long flags; | |
3684 | ||
3685 | if (!test_clear_buffer_uninit(bh) || !io_end) | |
3686 | goto out; | |
3687 | ||
3688 | if (!(io_end->inode->i_sb->s_flags & MS_ACTIVE)) { | |
3689 | printk("sb umounted, discard end_io request for inode %lu\n", | |
3690 | io_end->inode->i_ino); | |
3691 | ext4_free_io_end(io_end); | |
3692 | goto out; | |
3693 | } | |
3694 | ||
bd2d0210 | 3695 | io_end->flag = EXT4_IO_END_UNWRITTEN; |
744692dc JZ |
3696 | inode = io_end->inode; |
3697 | ||
3698 | /* Add the io_end to per-inode completed io list*/ | |
3699 | spin_lock_irqsave(&EXT4_I(inode)->i_completed_io_lock, flags); | |
3700 | list_add_tail(&io_end->list, &EXT4_I(inode)->i_completed_io_list); | |
3701 | spin_unlock_irqrestore(&EXT4_I(inode)->i_completed_io_lock, flags); | |
3702 | ||
3703 | wq = EXT4_SB(inode->i_sb)->dio_unwritten_wq; | |
3704 | /* queue the work to convert unwritten extents to written */ | |
3705 | queue_work(wq, &io_end->work); | |
3706 | out: | |
3707 | bh->b_private = NULL; | |
3708 | bh->b_end_io = NULL; | |
3709 | clear_buffer_uninit(bh); | |
3710 | end_buffer_async_write(bh, uptodate); | |
3711 | } | |
3712 | ||
3713 | static int ext4_set_bh_endio(struct buffer_head *bh, struct inode *inode) | |
3714 | { | |
3715 | ext4_io_end_t *io_end; | |
3716 | struct page *page = bh->b_page; | |
3717 | loff_t offset = (sector_t)page->index << PAGE_CACHE_SHIFT; | |
3718 | size_t size = bh->b_size; | |
3719 | ||
3720 | retry: | |
3721 | io_end = ext4_init_io_end(inode, GFP_ATOMIC); | |
3722 | if (!io_end) { | |
3723 | if (printk_ratelimit()) | |
3724 | printk(KERN_WARNING "%s: allocation fail\n", __func__); | |
3725 | schedule(); | |
3726 | goto retry; | |
3727 | } | |
3728 | io_end->offset = offset; | |
3729 | io_end->size = size; | |
3730 | /* | |
3731 | * We need to hold a reference to the page to make sure it | |
3732 | * doesn't get evicted before ext4_end_io_work() has a chance | |
3733 | * to convert the extent from written to unwritten. | |
3734 | */ | |
3735 | io_end->page = page; | |
3736 | get_page(io_end->page); | |
3737 | ||
3738 | bh->b_private = io_end; | |
3739 | bh->b_end_io = ext4_end_io_buffer_write; | |
3740 | return 0; | |
3741 | } | |
3742 | ||
4c0425ff MC |
3743 | /* |
3744 | * For ext4 extent files, ext4 will do direct-io write to holes, | |
3745 | * preallocated extents, and those write extend the file, no need to | |
3746 | * fall back to buffered IO. | |
3747 | * | |
3748 | * For holes, we fallocate those blocks, mark them as unintialized | |
3749 | * If those blocks were preallocated, we mark sure they are splited, but | |
3750 | * still keep the range to write as unintialized. | |
3751 | * | |
8d5d02e6 MC |
3752 | * The unwrritten extents will be converted to written when DIO is completed. |
3753 | * For async direct IO, since the IO may still pending when return, we | |
3754 | * set up an end_io call back function, which will do the convertion | |
3755 | * when async direct IO completed. | |
4c0425ff MC |
3756 | * |
3757 | * If the O_DIRECT write will extend the file then add this inode to the | |
3758 | * orphan list. So recovery will truncate it back to the original size | |
3759 | * if the machine crashes during the write. | |
3760 | * | |
3761 | */ | |
3762 | static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb, | |
3763 | const struct iovec *iov, loff_t offset, | |
3764 | unsigned long nr_segs) | |
3765 | { | |
3766 | struct file *file = iocb->ki_filp; | |
3767 | struct inode *inode = file->f_mapping->host; | |
3768 | ssize_t ret; | |
3769 | size_t count = iov_length(iov, nr_segs); | |
3770 | ||
3771 | loff_t final_size = offset + count; | |
3772 | if (rw == WRITE && final_size <= inode->i_size) { | |
3773 | /* | |
8d5d02e6 MC |
3774 | * We could direct write to holes and fallocate. |
3775 | * | |
3776 | * Allocated blocks to fill the hole are marked as uninitialized | |
4c0425ff MC |
3777 | * to prevent paralel buffered read to expose the stale data |
3778 | * before DIO complete the data IO. | |
8d5d02e6 MC |
3779 | * |
3780 | * As to previously fallocated extents, ext4 get_block | |
4c0425ff MC |
3781 | * will just simply mark the buffer mapped but still |
3782 | * keep the extents uninitialized. | |
3783 | * | |
8d5d02e6 MC |
3784 | * for non AIO case, we will convert those unwritten extents |
3785 | * to written after return back from blockdev_direct_IO. | |
3786 | * | |
3787 | * for async DIO, the conversion needs to be defered when | |
3788 | * the IO is completed. The ext4 end_io callback function | |
3789 | * will be called to take care of the conversion work. | |
3790 | * Here for async case, we allocate an io_end structure to | |
3791 | * hook to the iocb. | |
4c0425ff | 3792 | */ |
8d5d02e6 MC |
3793 | iocb->private = NULL; |
3794 | EXT4_I(inode)->cur_aio_dio = NULL; | |
3795 | if (!is_sync_kiocb(iocb)) { | |
744692dc | 3796 | iocb->private = ext4_init_io_end(inode, GFP_NOFS); |
8d5d02e6 MC |
3797 | if (!iocb->private) |
3798 | return -ENOMEM; | |
3799 | /* | |
3800 | * we save the io structure for current async | |
79e83036 | 3801 | * direct IO, so that later ext4_map_blocks() |
8d5d02e6 MC |
3802 | * could flag the io structure whether there |
3803 | * is a unwritten extents needs to be converted | |
3804 | * when IO is completed. | |
3805 | */ | |
3806 | EXT4_I(inode)->cur_aio_dio = iocb->private; | |
3807 | } | |
3808 | ||
4c0425ff MC |
3809 | ret = blockdev_direct_IO(rw, iocb, inode, |
3810 | inode->i_sb->s_bdev, iov, | |
3811 | offset, nr_segs, | |
c7064ef1 | 3812 | ext4_get_block_write, |
4c0425ff | 3813 | ext4_end_io_dio); |
8d5d02e6 MC |
3814 | if (iocb->private) |
3815 | EXT4_I(inode)->cur_aio_dio = NULL; | |
3816 | /* | |
3817 | * The io_end structure takes a reference to the inode, | |
3818 | * that structure needs to be destroyed and the | |
3819 | * reference to the inode need to be dropped, when IO is | |
3820 | * complete, even with 0 byte write, or failed. | |
3821 | * | |
3822 | * In the successful AIO DIO case, the io_end structure will be | |
3823 | * desctroyed and the reference to the inode will be dropped | |
3824 | * after the end_io call back function is called. | |
3825 | * | |
3826 | * In the case there is 0 byte write, or error case, since | |
3827 | * VFS direct IO won't invoke the end_io call back function, | |
3828 | * we need to free the end_io structure here. | |
3829 | */ | |
3830 | if (ret != -EIOCBQUEUED && ret <= 0 && iocb->private) { | |
3831 | ext4_free_io_end(iocb->private); | |
3832 | iocb->private = NULL; | |
19f5fb7a TT |
3833 | } else if (ret > 0 && ext4_test_inode_state(inode, |
3834 | EXT4_STATE_DIO_UNWRITTEN)) { | |
109f5565 | 3835 | int err; |
8d5d02e6 MC |
3836 | /* |
3837 | * for non AIO case, since the IO is already | |
3838 | * completed, we could do the convertion right here | |
3839 | */ | |
109f5565 M |
3840 | err = ext4_convert_unwritten_extents(inode, |
3841 | offset, ret); | |
3842 | if (err < 0) | |
3843 | ret = err; | |
19f5fb7a | 3844 | ext4_clear_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN); |
109f5565 | 3845 | } |
4c0425ff MC |
3846 | return ret; |
3847 | } | |
8d5d02e6 MC |
3848 | |
3849 | /* for write the the end of file case, we fall back to old way */ | |
4c0425ff MC |
3850 | return ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs); |
3851 | } | |
3852 | ||
3853 | static ssize_t ext4_direct_IO(int rw, struct kiocb *iocb, | |
3854 | const struct iovec *iov, loff_t offset, | |
3855 | unsigned long nr_segs) | |
3856 | { | |
3857 | struct file *file = iocb->ki_filp; | |
3858 | struct inode *inode = file->f_mapping->host; | |
3859 | ||
12e9b892 | 3860 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
4c0425ff MC |
3861 | return ext4_ext_direct_IO(rw, iocb, iov, offset, nr_segs); |
3862 | ||
3863 | return ext4_ind_direct_IO(rw, iocb, iov, offset, nr_segs); | |
3864 | } | |
3865 | ||
ac27a0ec | 3866 | /* |
617ba13b | 3867 | * Pages can be marked dirty completely asynchronously from ext4's journalling |
ac27a0ec DK |
3868 | * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do |
3869 | * much here because ->set_page_dirty is called under VFS locks. The page is | |
3870 | * not necessarily locked. | |
3871 | * | |
3872 | * We cannot just dirty the page and leave attached buffers clean, because the | |
3873 | * buffers' dirty state is "definitive". We cannot just set the buffers dirty | |
3874 | * or jbddirty because all the journalling code will explode. | |
3875 | * | |
3876 | * So what we do is to mark the page "pending dirty" and next time writepage | |
3877 | * is called, propagate that into the buffers appropriately. | |
3878 | */ | |
617ba13b | 3879 | static int ext4_journalled_set_page_dirty(struct page *page) |
ac27a0ec DK |
3880 | { |
3881 | SetPageChecked(page); | |
3882 | return __set_page_dirty_nobuffers(page); | |
3883 | } | |
3884 | ||
617ba13b | 3885 | static const struct address_space_operations ext4_ordered_aops = { |
8ab22b9a HH |
3886 | .readpage = ext4_readpage, |
3887 | .readpages = ext4_readpages, | |
43ce1d23 | 3888 | .writepage = ext4_writepage, |
8ab22b9a HH |
3889 | .sync_page = block_sync_page, |
3890 | .write_begin = ext4_write_begin, | |
3891 | .write_end = ext4_ordered_write_end, | |
3892 | .bmap = ext4_bmap, | |
3893 | .invalidatepage = ext4_invalidatepage, | |
3894 | .releasepage = ext4_releasepage, | |
3895 | .direct_IO = ext4_direct_IO, | |
3896 | .migratepage = buffer_migrate_page, | |
3897 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3898 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3899 | }; |
3900 | ||
617ba13b | 3901 | static const struct address_space_operations ext4_writeback_aops = { |
8ab22b9a HH |
3902 | .readpage = ext4_readpage, |
3903 | .readpages = ext4_readpages, | |
43ce1d23 | 3904 | .writepage = ext4_writepage, |
8ab22b9a HH |
3905 | .sync_page = block_sync_page, |
3906 | .write_begin = ext4_write_begin, | |
3907 | .write_end = ext4_writeback_write_end, | |
3908 | .bmap = ext4_bmap, | |
3909 | .invalidatepage = ext4_invalidatepage, | |
3910 | .releasepage = ext4_releasepage, | |
3911 | .direct_IO = ext4_direct_IO, | |
3912 | .migratepage = buffer_migrate_page, | |
3913 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3914 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3915 | }; |
3916 | ||
617ba13b | 3917 | static const struct address_space_operations ext4_journalled_aops = { |
8ab22b9a HH |
3918 | .readpage = ext4_readpage, |
3919 | .readpages = ext4_readpages, | |
43ce1d23 | 3920 | .writepage = ext4_writepage, |
8ab22b9a HH |
3921 | .sync_page = block_sync_page, |
3922 | .write_begin = ext4_write_begin, | |
3923 | .write_end = ext4_journalled_write_end, | |
3924 | .set_page_dirty = ext4_journalled_set_page_dirty, | |
3925 | .bmap = ext4_bmap, | |
3926 | .invalidatepage = ext4_invalidatepage, | |
3927 | .releasepage = ext4_releasepage, | |
3928 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3929 | .error_remove_page = generic_error_remove_page, |
ac27a0ec DK |
3930 | }; |
3931 | ||
64769240 | 3932 | static const struct address_space_operations ext4_da_aops = { |
8ab22b9a HH |
3933 | .readpage = ext4_readpage, |
3934 | .readpages = ext4_readpages, | |
43ce1d23 | 3935 | .writepage = ext4_writepage, |
8ab22b9a HH |
3936 | .writepages = ext4_da_writepages, |
3937 | .sync_page = block_sync_page, | |
3938 | .write_begin = ext4_da_write_begin, | |
3939 | .write_end = ext4_da_write_end, | |
3940 | .bmap = ext4_bmap, | |
3941 | .invalidatepage = ext4_da_invalidatepage, | |
3942 | .releasepage = ext4_releasepage, | |
3943 | .direct_IO = ext4_direct_IO, | |
3944 | .migratepage = buffer_migrate_page, | |
3945 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 3946 | .error_remove_page = generic_error_remove_page, |
64769240 AT |
3947 | }; |
3948 | ||
617ba13b | 3949 | void ext4_set_aops(struct inode *inode) |
ac27a0ec | 3950 | { |
cd1aac32 AK |
3951 | if (ext4_should_order_data(inode) && |
3952 | test_opt(inode->i_sb, DELALLOC)) | |
3953 | inode->i_mapping->a_ops = &ext4_da_aops; | |
3954 | else if (ext4_should_order_data(inode)) | |
617ba13b | 3955 | inode->i_mapping->a_ops = &ext4_ordered_aops; |
64769240 AT |
3956 | else if (ext4_should_writeback_data(inode) && |
3957 | test_opt(inode->i_sb, DELALLOC)) | |
3958 | inode->i_mapping->a_ops = &ext4_da_aops; | |
617ba13b MC |
3959 | else if (ext4_should_writeback_data(inode)) |
3960 | inode->i_mapping->a_ops = &ext4_writeback_aops; | |
ac27a0ec | 3961 | else |
617ba13b | 3962 | inode->i_mapping->a_ops = &ext4_journalled_aops; |
ac27a0ec DK |
3963 | } |
3964 | ||
3965 | /* | |
617ba13b | 3966 | * ext4_block_truncate_page() zeroes out a mapping from file offset `from' |
ac27a0ec DK |
3967 | * up to the end of the block which corresponds to `from'. |
3968 | * This required during truncate. We need to physically zero the tail end | |
3969 | * of that block so it doesn't yield old data if the file is later grown. | |
3970 | */ | |
cf108bca | 3971 | int ext4_block_truncate_page(handle_t *handle, |
ac27a0ec DK |
3972 | struct address_space *mapping, loff_t from) |
3973 | { | |
617ba13b | 3974 | ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT; |
ac27a0ec | 3975 | unsigned offset = from & (PAGE_CACHE_SIZE-1); |
725d26d3 AK |
3976 | unsigned blocksize, length, pos; |
3977 | ext4_lblk_t iblock; | |
ac27a0ec DK |
3978 | struct inode *inode = mapping->host; |
3979 | struct buffer_head *bh; | |
cf108bca | 3980 | struct page *page; |
ac27a0ec | 3981 | int err = 0; |
ac27a0ec | 3982 | |
f4a01017 TT |
3983 | page = find_or_create_page(mapping, from >> PAGE_CACHE_SHIFT, |
3984 | mapping_gfp_mask(mapping) & ~__GFP_FS); | |
cf108bca JK |
3985 | if (!page) |
3986 | return -EINVAL; | |
3987 | ||
ac27a0ec DK |
3988 | blocksize = inode->i_sb->s_blocksize; |
3989 | length = blocksize - (offset & (blocksize - 1)); | |
3990 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
3991 | ||
ac27a0ec DK |
3992 | if (!page_has_buffers(page)) |
3993 | create_empty_buffers(page, blocksize, 0); | |
3994 | ||
3995 | /* Find the buffer that contains "offset" */ | |
3996 | bh = page_buffers(page); | |
3997 | pos = blocksize; | |
3998 | while (offset >= pos) { | |
3999 | bh = bh->b_this_page; | |
4000 | iblock++; | |
4001 | pos += blocksize; | |
4002 | } | |
4003 | ||
4004 | err = 0; | |
4005 | if (buffer_freed(bh)) { | |
4006 | BUFFER_TRACE(bh, "freed: skip"); | |
4007 | goto unlock; | |
4008 | } | |
4009 | ||
4010 | if (!buffer_mapped(bh)) { | |
4011 | BUFFER_TRACE(bh, "unmapped"); | |
617ba13b | 4012 | ext4_get_block(inode, iblock, bh, 0); |
ac27a0ec DK |
4013 | /* unmapped? It's a hole - nothing to do */ |
4014 | if (!buffer_mapped(bh)) { | |
4015 | BUFFER_TRACE(bh, "still unmapped"); | |
4016 | goto unlock; | |
4017 | } | |
4018 | } | |
4019 | ||
4020 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
4021 | if (PageUptodate(page)) | |
4022 | set_buffer_uptodate(bh); | |
4023 | ||
4024 | if (!buffer_uptodate(bh)) { | |
4025 | err = -EIO; | |
4026 | ll_rw_block(READ, 1, &bh); | |
4027 | wait_on_buffer(bh); | |
4028 | /* Uhhuh. Read error. Complain and punt. */ | |
4029 | if (!buffer_uptodate(bh)) | |
4030 | goto unlock; | |
4031 | } | |
4032 | ||
617ba13b | 4033 | if (ext4_should_journal_data(inode)) { |
ac27a0ec | 4034 | BUFFER_TRACE(bh, "get write access"); |
617ba13b | 4035 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
4036 | if (err) |
4037 | goto unlock; | |
4038 | } | |
4039 | ||
eebd2aa3 | 4040 | zero_user(page, offset, length); |
ac27a0ec DK |
4041 | |
4042 | BUFFER_TRACE(bh, "zeroed end of block"); | |
4043 | ||
4044 | err = 0; | |
617ba13b | 4045 | if (ext4_should_journal_data(inode)) { |
0390131b | 4046 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
ac27a0ec | 4047 | } else { |
617ba13b | 4048 | if (ext4_should_order_data(inode)) |
678aaf48 | 4049 | err = ext4_jbd2_file_inode(handle, inode); |
ac27a0ec DK |
4050 | mark_buffer_dirty(bh); |
4051 | } | |
4052 | ||
4053 | unlock: | |
4054 | unlock_page(page); | |
4055 | page_cache_release(page); | |
4056 | return err; | |
4057 | } | |
4058 | ||
4059 | /* | |
4060 | * Probably it should be a library function... search for first non-zero word | |
4061 | * or memcmp with zero_page, whatever is better for particular architecture. | |
4062 | * Linus? | |
4063 | */ | |
4064 | static inline int all_zeroes(__le32 *p, __le32 *q) | |
4065 | { | |
4066 | while (p < q) | |
4067 | if (*p++) | |
4068 | return 0; | |
4069 | return 1; | |
4070 | } | |
4071 | ||
4072 | /** | |
617ba13b | 4073 | * ext4_find_shared - find the indirect blocks for partial truncation. |
ac27a0ec DK |
4074 | * @inode: inode in question |
4075 | * @depth: depth of the affected branch | |
617ba13b | 4076 | * @offsets: offsets of pointers in that branch (see ext4_block_to_path) |
ac27a0ec DK |
4077 | * @chain: place to store the pointers to partial indirect blocks |
4078 | * @top: place to the (detached) top of branch | |
4079 | * | |
617ba13b | 4080 | * This is a helper function used by ext4_truncate(). |
ac27a0ec DK |
4081 | * |
4082 | * When we do truncate() we may have to clean the ends of several | |
4083 | * indirect blocks but leave the blocks themselves alive. Block is | |
4084 | * partially truncated if some data below the new i_size is refered | |
4085 | * from it (and it is on the path to the first completely truncated | |
4086 | * data block, indeed). We have to free the top of that path along | |
4087 | * with everything to the right of the path. Since no allocation | |
617ba13b | 4088 | * past the truncation point is possible until ext4_truncate() |
ac27a0ec DK |
4089 | * finishes, we may safely do the latter, but top of branch may |
4090 | * require special attention - pageout below the truncation point | |
4091 | * might try to populate it. | |
4092 | * | |
4093 | * We atomically detach the top of branch from the tree, store the | |
4094 | * block number of its root in *@top, pointers to buffer_heads of | |
4095 | * partially truncated blocks - in @chain[].bh and pointers to | |
4096 | * their last elements that should not be removed - in | |
4097 | * @chain[].p. Return value is the pointer to last filled element | |
4098 | * of @chain. | |
4099 | * | |
4100 | * The work left to caller to do the actual freeing of subtrees: | |
4101 | * a) free the subtree starting from *@top | |
4102 | * b) free the subtrees whose roots are stored in | |
4103 | * (@chain[i].p+1 .. end of @chain[i].bh->b_data) | |
4104 | * c) free the subtrees growing from the inode past the @chain[0]. | |
4105 | * (no partially truncated stuff there). */ | |
4106 | ||
617ba13b | 4107 | static Indirect *ext4_find_shared(struct inode *inode, int depth, |
de9a55b8 TT |
4108 | ext4_lblk_t offsets[4], Indirect chain[4], |
4109 | __le32 *top) | |
ac27a0ec DK |
4110 | { |
4111 | Indirect *partial, *p; | |
4112 | int k, err; | |
4113 | ||
4114 | *top = 0; | |
bf48aabb | 4115 | /* Make k index the deepest non-null offset + 1 */ |
ac27a0ec DK |
4116 | for (k = depth; k > 1 && !offsets[k-1]; k--) |
4117 | ; | |
617ba13b | 4118 | partial = ext4_get_branch(inode, k, offsets, chain, &err); |
ac27a0ec DK |
4119 | /* Writer: pointers */ |
4120 | if (!partial) | |
4121 | partial = chain + k-1; | |
4122 | /* | |
4123 | * If the branch acquired continuation since we've looked at it - | |
4124 | * fine, it should all survive and (new) top doesn't belong to us. | |
4125 | */ | |
4126 | if (!partial->key && *partial->p) | |
4127 | /* Writer: end */ | |
4128 | goto no_top; | |
af5bc92d | 4129 | for (p = partial; (p > chain) && all_zeroes((__le32 *) p->bh->b_data, p->p); p--) |
ac27a0ec DK |
4130 | ; |
4131 | /* | |
4132 | * OK, we've found the last block that must survive. The rest of our | |
4133 | * branch should be detached before unlocking. However, if that rest | |
4134 | * of branch is all ours and does not grow immediately from the inode | |
4135 | * it's easier to cheat and just decrement partial->p. | |
4136 | */ | |
4137 | if (p == chain + k - 1 && p > chain) { | |
4138 | p->p--; | |
4139 | } else { | |
4140 | *top = *p->p; | |
617ba13b | 4141 | /* Nope, don't do this in ext4. Must leave the tree intact */ |
ac27a0ec DK |
4142 | #if 0 |
4143 | *p->p = 0; | |
4144 | #endif | |
4145 | } | |
4146 | /* Writer: end */ | |
4147 | ||
af5bc92d | 4148 | while (partial > p) { |
ac27a0ec DK |
4149 | brelse(partial->bh); |
4150 | partial--; | |
4151 | } | |
4152 | no_top: | |
4153 | return partial; | |
4154 | } | |
4155 | ||
4156 | /* | |
4157 | * Zero a number of block pointers in either an inode or an indirect block. | |
4158 | * If we restart the transaction we must again get write access to the | |
4159 | * indirect block for further modification. | |
4160 | * | |
4161 | * We release `count' blocks on disk, but (last - first) may be greater | |
4162 | * than `count' because there can be holes in there. | |
4163 | */ | |
1f2acb60 TT |
4164 | static int ext4_clear_blocks(handle_t *handle, struct inode *inode, |
4165 | struct buffer_head *bh, | |
4166 | ext4_fsblk_t block_to_free, | |
4167 | unsigned long count, __le32 *first, | |
4168 | __le32 *last) | |
ac27a0ec DK |
4169 | { |
4170 | __le32 *p; | |
1f2acb60 | 4171 | int flags = EXT4_FREE_BLOCKS_FORGET | EXT4_FREE_BLOCKS_VALIDATED; |
e6362609 TT |
4172 | |
4173 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) | |
4174 | flags |= EXT4_FREE_BLOCKS_METADATA; | |
50689696 | 4175 | |
1f2acb60 TT |
4176 | if (!ext4_data_block_valid(EXT4_SB(inode->i_sb), block_to_free, |
4177 | count)) { | |
24676da4 TT |
4178 | EXT4_ERROR_INODE(inode, "attempt to clear invalid " |
4179 | "blocks %llu len %lu", | |
4180 | (unsigned long long) block_to_free, count); | |
1f2acb60 TT |
4181 | return 1; |
4182 | } | |
4183 | ||
ac27a0ec DK |
4184 | if (try_to_extend_transaction(handle, inode)) { |
4185 | if (bh) { | |
0390131b FM |
4186 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
4187 | ext4_handle_dirty_metadata(handle, inode, bh); | |
ac27a0ec | 4188 | } |
617ba13b | 4189 | ext4_mark_inode_dirty(handle, inode); |
487caeef JK |
4190 | ext4_truncate_restart_trans(handle, inode, |
4191 | blocks_for_truncate(inode)); | |
ac27a0ec DK |
4192 | if (bh) { |
4193 | BUFFER_TRACE(bh, "retaking write access"); | |
617ba13b | 4194 | ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
4195 | } |
4196 | } | |
4197 | ||
e6362609 TT |
4198 | for (p = first; p < last; p++) |
4199 | *p = 0; | |
ac27a0ec | 4200 | |
e6362609 | 4201 | ext4_free_blocks(handle, inode, 0, block_to_free, count, flags); |
1f2acb60 | 4202 | return 0; |
ac27a0ec DK |
4203 | } |
4204 | ||
4205 | /** | |
617ba13b | 4206 | * ext4_free_data - free a list of data blocks |
ac27a0ec DK |
4207 | * @handle: handle for this transaction |
4208 | * @inode: inode we are dealing with | |
4209 | * @this_bh: indirect buffer_head which contains *@first and *@last | |
4210 | * @first: array of block numbers | |
4211 | * @last: points immediately past the end of array | |
4212 | * | |
4213 | * We are freeing all blocks refered from that array (numbers are stored as | |
4214 | * little-endian 32-bit) and updating @inode->i_blocks appropriately. | |
4215 | * | |
4216 | * We accumulate contiguous runs of blocks to free. Conveniently, if these | |
4217 | * blocks are contiguous then releasing them at one time will only affect one | |
4218 | * or two bitmap blocks (+ group descriptor(s) and superblock) and we won't | |
4219 | * actually use a lot of journal space. | |
4220 | * | |
4221 | * @this_bh will be %NULL if @first and @last point into the inode's direct | |
4222 | * block pointers. | |
4223 | */ | |
617ba13b | 4224 | static void ext4_free_data(handle_t *handle, struct inode *inode, |
ac27a0ec DK |
4225 | struct buffer_head *this_bh, |
4226 | __le32 *first, __le32 *last) | |
4227 | { | |
617ba13b | 4228 | ext4_fsblk_t block_to_free = 0; /* Starting block # of a run */ |
ac27a0ec DK |
4229 | unsigned long count = 0; /* Number of blocks in the run */ |
4230 | __le32 *block_to_free_p = NULL; /* Pointer into inode/ind | |
4231 | corresponding to | |
4232 | block_to_free */ | |
617ba13b | 4233 | ext4_fsblk_t nr; /* Current block # */ |
ac27a0ec DK |
4234 | __le32 *p; /* Pointer into inode/ind |
4235 | for current block */ | |
4236 | int err; | |
4237 | ||
4238 | if (this_bh) { /* For indirect block */ | |
4239 | BUFFER_TRACE(this_bh, "get_write_access"); | |
617ba13b | 4240 | err = ext4_journal_get_write_access(handle, this_bh); |
ac27a0ec DK |
4241 | /* Important: if we can't update the indirect pointers |
4242 | * to the blocks, we can't free them. */ | |
4243 | if (err) | |
4244 | return; | |
4245 | } | |
4246 | ||
4247 | for (p = first; p < last; p++) { | |
4248 | nr = le32_to_cpu(*p); | |
4249 | if (nr) { | |
4250 | /* accumulate blocks to free if they're contiguous */ | |
4251 | if (count == 0) { | |
4252 | block_to_free = nr; | |
4253 | block_to_free_p = p; | |
4254 | count = 1; | |
4255 | } else if (nr == block_to_free + count) { | |
4256 | count++; | |
4257 | } else { | |
1f2acb60 TT |
4258 | if (ext4_clear_blocks(handle, inode, this_bh, |
4259 | block_to_free, count, | |
4260 | block_to_free_p, p)) | |
4261 | break; | |
ac27a0ec DK |
4262 | block_to_free = nr; |
4263 | block_to_free_p = p; | |
4264 | count = 1; | |
4265 | } | |
4266 | } | |
4267 | } | |
4268 | ||
4269 | if (count > 0) | |
617ba13b | 4270 | ext4_clear_blocks(handle, inode, this_bh, block_to_free, |
ac27a0ec DK |
4271 | count, block_to_free_p, p); |
4272 | ||
4273 | if (this_bh) { | |
0390131b | 4274 | BUFFER_TRACE(this_bh, "call ext4_handle_dirty_metadata"); |
71dc8fbc DG |
4275 | |
4276 | /* | |
4277 | * The buffer head should have an attached journal head at this | |
4278 | * point. However, if the data is corrupted and an indirect | |
4279 | * block pointed to itself, it would have been detached when | |
4280 | * the block was cleared. Check for this instead of OOPSing. | |
4281 | */ | |
e7f07968 | 4282 | if ((EXT4_JOURNAL(inode) == NULL) || bh2jh(this_bh)) |
0390131b | 4283 | ext4_handle_dirty_metadata(handle, inode, this_bh); |
71dc8fbc | 4284 | else |
24676da4 TT |
4285 | EXT4_ERROR_INODE(inode, |
4286 | "circular indirect block detected at " | |
4287 | "block %llu", | |
4288 | (unsigned long long) this_bh->b_blocknr); | |
ac27a0ec DK |
4289 | } |
4290 | } | |
4291 | ||
4292 | /** | |
617ba13b | 4293 | * ext4_free_branches - free an array of branches |
ac27a0ec DK |
4294 | * @handle: JBD handle for this transaction |
4295 | * @inode: inode we are dealing with | |
4296 | * @parent_bh: the buffer_head which contains *@first and *@last | |
4297 | * @first: array of block numbers | |
4298 | * @last: pointer immediately past the end of array | |
4299 | * @depth: depth of the branches to free | |
4300 | * | |
4301 | * We are freeing all blocks refered from these branches (numbers are | |
4302 | * stored as little-endian 32-bit) and updating @inode->i_blocks | |
4303 | * appropriately. | |
4304 | */ | |
617ba13b | 4305 | static void ext4_free_branches(handle_t *handle, struct inode *inode, |
ac27a0ec DK |
4306 | struct buffer_head *parent_bh, |
4307 | __le32 *first, __le32 *last, int depth) | |
4308 | { | |
617ba13b | 4309 | ext4_fsblk_t nr; |
ac27a0ec DK |
4310 | __le32 *p; |
4311 | ||
0390131b | 4312 | if (ext4_handle_is_aborted(handle)) |
ac27a0ec DK |
4313 | return; |
4314 | ||
4315 | if (depth--) { | |
4316 | struct buffer_head *bh; | |
617ba13b | 4317 | int addr_per_block = EXT4_ADDR_PER_BLOCK(inode->i_sb); |
ac27a0ec DK |
4318 | p = last; |
4319 | while (--p >= first) { | |
4320 | nr = le32_to_cpu(*p); | |
4321 | if (!nr) | |
4322 | continue; /* A hole */ | |
4323 | ||
1f2acb60 TT |
4324 | if (!ext4_data_block_valid(EXT4_SB(inode->i_sb), |
4325 | nr, 1)) { | |
24676da4 TT |
4326 | EXT4_ERROR_INODE(inode, |
4327 | "invalid indirect mapped " | |
4328 | "block %lu (level %d)", | |
4329 | (unsigned long) nr, depth); | |
1f2acb60 TT |
4330 | break; |
4331 | } | |
4332 | ||
ac27a0ec DK |
4333 | /* Go read the buffer for the next level down */ |
4334 | bh = sb_bread(inode->i_sb, nr); | |
4335 | ||
4336 | /* | |
4337 | * A read failure? Report error and clear slot | |
4338 | * (should be rare). | |
4339 | */ | |
4340 | if (!bh) { | |
c398eda0 TT |
4341 | EXT4_ERROR_INODE_BLOCK(inode, nr, |
4342 | "Read failure"); | |
ac27a0ec DK |
4343 | continue; |
4344 | } | |
4345 | ||
4346 | /* This zaps the entire block. Bottom up. */ | |
4347 | BUFFER_TRACE(bh, "free child branches"); | |
617ba13b | 4348 | ext4_free_branches(handle, inode, bh, |
af5bc92d TT |
4349 | (__le32 *) bh->b_data, |
4350 | (__le32 *) bh->b_data + addr_per_block, | |
4351 | depth); | |
ac27a0ec | 4352 | |
ac27a0ec DK |
4353 | /* |
4354 | * Everything below this this pointer has been | |
4355 | * released. Now let this top-of-subtree go. | |
4356 | * | |
4357 | * We want the freeing of this indirect block to be | |
4358 | * atomic in the journal with the updating of the | |
4359 | * bitmap block which owns it. So make some room in | |
4360 | * the journal. | |
4361 | * | |
4362 | * We zero the parent pointer *after* freeing its | |
4363 | * pointee in the bitmaps, so if extend_transaction() | |
4364 | * for some reason fails to put the bitmap changes and | |
4365 | * the release into the same transaction, recovery | |
4366 | * will merely complain about releasing a free block, | |
4367 | * rather than leaking blocks. | |
4368 | */ | |
0390131b | 4369 | if (ext4_handle_is_aborted(handle)) |
ac27a0ec DK |
4370 | return; |
4371 | if (try_to_extend_transaction(handle, inode)) { | |
617ba13b | 4372 | ext4_mark_inode_dirty(handle, inode); |
487caeef JK |
4373 | ext4_truncate_restart_trans(handle, inode, |
4374 | blocks_for_truncate(inode)); | |
ac27a0ec DK |
4375 | } |
4376 | ||
40389687 A |
4377 | /* |
4378 | * The forget flag here is critical because if | |
4379 | * we are journaling (and not doing data | |
4380 | * journaling), we have to make sure a revoke | |
4381 | * record is written to prevent the journal | |
4382 | * replay from overwriting the (former) | |
4383 | * indirect block if it gets reallocated as a | |
4384 | * data block. This must happen in the same | |
4385 | * transaction where the data blocks are | |
4386 | * actually freed. | |
4387 | */ | |
e6362609 | 4388 | ext4_free_blocks(handle, inode, 0, nr, 1, |
40389687 A |
4389 | EXT4_FREE_BLOCKS_METADATA| |
4390 | EXT4_FREE_BLOCKS_FORGET); | |
ac27a0ec DK |
4391 | |
4392 | if (parent_bh) { | |
4393 | /* | |
4394 | * The block which we have just freed is | |
4395 | * pointed to by an indirect block: journal it | |
4396 | */ | |
4397 | BUFFER_TRACE(parent_bh, "get_write_access"); | |
617ba13b | 4398 | if (!ext4_journal_get_write_access(handle, |
ac27a0ec DK |
4399 | parent_bh)){ |
4400 | *p = 0; | |
4401 | BUFFER_TRACE(parent_bh, | |
0390131b FM |
4402 | "call ext4_handle_dirty_metadata"); |
4403 | ext4_handle_dirty_metadata(handle, | |
4404 | inode, | |
4405 | parent_bh); | |
ac27a0ec DK |
4406 | } |
4407 | } | |
4408 | } | |
4409 | } else { | |
4410 | /* We have reached the bottom of the tree. */ | |
4411 | BUFFER_TRACE(parent_bh, "free data blocks"); | |
617ba13b | 4412 | ext4_free_data(handle, inode, parent_bh, first, last); |
ac27a0ec DK |
4413 | } |
4414 | } | |
4415 | ||
91ef4caf DG |
4416 | int ext4_can_truncate(struct inode *inode) |
4417 | { | |
4418 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
4419 | return 0; | |
4420 | if (S_ISREG(inode->i_mode)) | |
4421 | return 1; | |
4422 | if (S_ISDIR(inode->i_mode)) | |
4423 | return 1; | |
4424 | if (S_ISLNK(inode->i_mode)) | |
4425 | return !ext4_inode_is_fast_symlink(inode); | |
4426 | return 0; | |
4427 | } | |
4428 | ||
ac27a0ec | 4429 | /* |
617ba13b | 4430 | * ext4_truncate() |
ac27a0ec | 4431 | * |
617ba13b MC |
4432 | * We block out ext4_get_block() block instantiations across the entire |
4433 | * transaction, and VFS/VM ensures that ext4_truncate() cannot run | |
ac27a0ec DK |
4434 | * simultaneously on behalf of the same inode. |
4435 | * | |
4436 | * As we work through the truncate and commmit bits of it to the journal there | |
4437 | * is one core, guiding principle: the file's tree must always be consistent on | |
4438 | * disk. We must be able to restart the truncate after a crash. | |
4439 | * | |
4440 | * The file's tree may be transiently inconsistent in memory (although it | |
4441 | * probably isn't), but whenever we close off and commit a journal transaction, | |
4442 | * the contents of (the filesystem + the journal) must be consistent and | |
4443 | * restartable. It's pretty simple, really: bottom up, right to left (although | |
4444 | * left-to-right works OK too). | |
4445 | * | |
4446 | * Note that at recovery time, journal replay occurs *before* the restart of | |
4447 | * truncate against the orphan inode list. | |
4448 | * | |
4449 | * The committed inode has the new, desired i_size (which is the same as | |
617ba13b | 4450 | * i_disksize in this case). After a crash, ext4_orphan_cleanup() will see |
ac27a0ec | 4451 | * that this inode's truncate did not complete and it will again call |
617ba13b MC |
4452 | * ext4_truncate() to have another go. So there will be instantiated blocks |
4453 | * to the right of the truncation point in a crashed ext4 filesystem. But | |
ac27a0ec | 4454 | * that's fine - as long as they are linked from the inode, the post-crash |
617ba13b | 4455 | * ext4_truncate() run will find them and release them. |
ac27a0ec | 4456 | */ |
617ba13b | 4457 | void ext4_truncate(struct inode *inode) |
ac27a0ec DK |
4458 | { |
4459 | handle_t *handle; | |
617ba13b | 4460 | struct ext4_inode_info *ei = EXT4_I(inode); |
ac27a0ec | 4461 | __le32 *i_data = ei->i_data; |
617ba13b | 4462 | int addr_per_block = EXT4_ADDR_PER_BLOCK(inode->i_sb); |
ac27a0ec | 4463 | struct address_space *mapping = inode->i_mapping; |
725d26d3 | 4464 | ext4_lblk_t offsets[4]; |
ac27a0ec DK |
4465 | Indirect chain[4]; |
4466 | Indirect *partial; | |
4467 | __le32 nr = 0; | |
4468 | int n; | |
725d26d3 | 4469 | ext4_lblk_t last_block; |
ac27a0ec | 4470 | unsigned blocksize = inode->i_sb->s_blocksize; |
ac27a0ec | 4471 | |
91ef4caf | 4472 | if (!ext4_can_truncate(inode)) |
ac27a0ec DK |
4473 | return; |
4474 | ||
12e9b892 | 4475 | ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
c8d46e41 | 4476 | |
5534fb5b | 4477 | if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC)) |
19f5fb7a | 4478 | ext4_set_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); |
7d8f9f7d | 4479 | |
12e9b892 | 4480 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
cf108bca | 4481 | ext4_ext_truncate(inode); |
1d03ec98 AK |
4482 | return; |
4483 | } | |
a86c6181 | 4484 | |
ac27a0ec | 4485 | handle = start_transaction(inode); |
cf108bca | 4486 | if (IS_ERR(handle)) |
ac27a0ec | 4487 | return; /* AKPM: return what? */ |
ac27a0ec DK |
4488 | |
4489 | last_block = (inode->i_size + blocksize-1) | |
617ba13b | 4490 | >> EXT4_BLOCK_SIZE_BITS(inode->i_sb); |
ac27a0ec | 4491 | |
cf108bca JK |
4492 | if (inode->i_size & (blocksize - 1)) |
4493 | if (ext4_block_truncate_page(handle, mapping, inode->i_size)) | |
4494 | goto out_stop; | |
ac27a0ec | 4495 | |
617ba13b | 4496 | n = ext4_block_to_path(inode, last_block, offsets, NULL); |
ac27a0ec DK |
4497 | if (n == 0) |
4498 | goto out_stop; /* error */ | |
4499 | ||
4500 | /* | |
4501 | * OK. This truncate is going to happen. We add the inode to the | |
4502 | * orphan list, so that if this truncate spans multiple transactions, | |
4503 | * and we crash, we will resume the truncate when the filesystem | |
4504 | * recovers. It also marks the inode dirty, to catch the new size. | |
4505 | * | |
4506 | * Implication: the file must always be in a sane, consistent | |
4507 | * truncatable state while each transaction commits. | |
4508 | */ | |
617ba13b | 4509 | if (ext4_orphan_add(handle, inode)) |
ac27a0ec DK |
4510 | goto out_stop; |
4511 | ||
632eaeab MC |
4512 | /* |
4513 | * From here we block out all ext4_get_block() callers who want to | |
4514 | * modify the block allocation tree. | |
4515 | */ | |
4516 | down_write(&ei->i_data_sem); | |
b4df2030 | 4517 | |
c2ea3fde | 4518 | ext4_discard_preallocations(inode); |
b4df2030 | 4519 | |
ac27a0ec DK |
4520 | /* |
4521 | * The orphan list entry will now protect us from any crash which | |
4522 | * occurs before the truncate completes, so it is now safe to propagate | |
4523 | * the new, shorter inode size (held for now in i_size) into the | |
4524 | * on-disk inode. We do this via i_disksize, which is the value which | |
617ba13b | 4525 | * ext4 *really* writes onto the disk inode. |
ac27a0ec DK |
4526 | */ |
4527 | ei->i_disksize = inode->i_size; | |
4528 | ||
ac27a0ec | 4529 | if (n == 1) { /* direct blocks */ |
617ba13b MC |
4530 | ext4_free_data(handle, inode, NULL, i_data+offsets[0], |
4531 | i_data + EXT4_NDIR_BLOCKS); | |
ac27a0ec DK |
4532 | goto do_indirects; |
4533 | } | |
4534 | ||
617ba13b | 4535 | partial = ext4_find_shared(inode, n, offsets, chain, &nr); |
ac27a0ec DK |
4536 | /* Kill the top of shared branch (not detached) */ |
4537 | if (nr) { | |
4538 | if (partial == chain) { | |
4539 | /* Shared branch grows from the inode */ | |
617ba13b | 4540 | ext4_free_branches(handle, inode, NULL, |
ac27a0ec DK |
4541 | &nr, &nr+1, (chain+n-1) - partial); |
4542 | *partial->p = 0; | |
4543 | /* | |
4544 | * We mark the inode dirty prior to restart, | |
4545 | * and prior to stop. No need for it here. | |
4546 | */ | |
4547 | } else { | |
4548 | /* Shared branch grows from an indirect block */ | |
4549 | BUFFER_TRACE(partial->bh, "get_write_access"); | |
617ba13b | 4550 | ext4_free_branches(handle, inode, partial->bh, |
ac27a0ec DK |
4551 | partial->p, |
4552 | partial->p+1, (chain+n-1) - partial); | |
4553 | } | |
4554 | } | |
4555 | /* Clear the ends of indirect blocks on the shared branch */ | |
4556 | while (partial > chain) { | |
617ba13b | 4557 | ext4_free_branches(handle, inode, partial->bh, partial->p + 1, |
ac27a0ec DK |
4558 | (__le32*)partial->bh->b_data+addr_per_block, |
4559 | (chain+n-1) - partial); | |
4560 | BUFFER_TRACE(partial->bh, "call brelse"); | |
de9a55b8 | 4561 | brelse(partial->bh); |
ac27a0ec DK |
4562 | partial--; |
4563 | } | |
4564 | do_indirects: | |
4565 | /* Kill the remaining (whole) subtrees */ | |
4566 | switch (offsets[0]) { | |
4567 | default: | |
617ba13b | 4568 | nr = i_data[EXT4_IND_BLOCK]; |
ac27a0ec | 4569 | if (nr) { |
617ba13b MC |
4570 | ext4_free_branches(handle, inode, NULL, &nr, &nr+1, 1); |
4571 | i_data[EXT4_IND_BLOCK] = 0; | |
ac27a0ec | 4572 | } |
617ba13b MC |
4573 | case EXT4_IND_BLOCK: |
4574 | nr = i_data[EXT4_DIND_BLOCK]; | |
ac27a0ec | 4575 | if (nr) { |
617ba13b MC |
4576 | ext4_free_branches(handle, inode, NULL, &nr, &nr+1, 2); |
4577 | i_data[EXT4_DIND_BLOCK] = 0; | |
ac27a0ec | 4578 | } |
617ba13b MC |
4579 | case EXT4_DIND_BLOCK: |
4580 | nr = i_data[EXT4_TIND_BLOCK]; | |
ac27a0ec | 4581 | if (nr) { |
617ba13b MC |
4582 | ext4_free_branches(handle, inode, NULL, &nr, &nr+1, 3); |
4583 | i_data[EXT4_TIND_BLOCK] = 0; | |
ac27a0ec | 4584 | } |
617ba13b | 4585 | case EXT4_TIND_BLOCK: |
ac27a0ec DK |
4586 | ; |
4587 | } | |
4588 | ||
0e855ac8 | 4589 | up_write(&ei->i_data_sem); |
ef7f3835 | 4590 | inode->i_mtime = inode->i_ctime = ext4_current_time(inode); |
617ba13b | 4591 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
4592 | |
4593 | /* | |
4594 | * In a multi-transaction truncate, we only make the final transaction | |
4595 | * synchronous | |
4596 | */ | |
4597 | if (IS_SYNC(inode)) | |
0390131b | 4598 | ext4_handle_sync(handle); |
ac27a0ec DK |
4599 | out_stop: |
4600 | /* | |
4601 | * If this was a simple ftruncate(), and the file will remain alive | |
4602 | * then we need to clear up the orphan record which we created above. | |
4603 | * However, if this was a real unlink then we were called by | |
617ba13b | 4604 | * ext4_delete_inode(), and we allow that function to clean up the |
ac27a0ec DK |
4605 | * orphan info for us. |
4606 | */ | |
4607 | if (inode->i_nlink) | |
617ba13b | 4608 | ext4_orphan_del(handle, inode); |
ac27a0ec | 4609 | |
617ba13b | 4610 | ext4_journal_stop(handle); |
ac27a0ec DK |
4611 | } |
4612 | ||
ac27a0ec | 4613 | /* |
617ba13b | 4614 | * ext4_get_inode_loc returns with an extra refcount against the inode's |
ac27a0ec DK |
4615 | * underlying buffer_head on success. If 'in_mem' is true, we have all |
4616 | * data in memory that is needed to recreate the on-disk version of this | |
4617 | * inode. | |
4618 | */ | |
617ba13b MC |
4619 | static int __ext4_get_inode_loc(struct inode *inode, |
4620 | struct ext4_iloc *iloc, int in_mem) | |
ac27a0ec | 4621 | { |
240799cd TT |
4622 | struct ext4_group_desc *gdp; |
4623 | struct buffer_head *bh; | |
4624 | struct super_block *sb = inode->i_sb; | |
4625 | ext4_fsblk_t block; | |
4626 | int inodes_per_block, inode_offset; | |
4627 | ||
3a06d778 | 4628 | iloc->bh = NULL; |
240799cd TT |
4629 | if (!ext4_valid_inum(sb, inode->i_ino)) |
4630 | return -EIO; | |
ac27a0ec | 4631 | |
240799cd TT |
4632 | iloc->block_group = (inode->i_ino - 1) / EXT4_INODES_PER_GROUP(sb); |
4633 | gdp = ext4_get_group_desc(sb, iloc->block_group, NULL); | |
4634 | if (!gdp) | |
ac27a0ec DK |
4635 | return -EIO; |
4636 | ||
240799cd TT |
4637 | /* |
4638 | * Figure out the offset within the block group inode table | |
4639 | */ | |
4640 | inodes_per_block = (EXT4_BLOCK_SIZE(sb) / EXT4_INODE_SIZE(sb)); | |
4641 | inode_offset = ((inode->i_ino - 1) % | |
4642 | EXT4_INODES_PER_GROUP(sb)); | |
4643 | block = ext4_inode_table(sb, gdp) + (inode_offset / inodes_per_block); | |
4644 | iloc->offset = (inode_offset % inodes_per_block) * EXT4_INODE_SIZE(sb); | |
4645 | ||
4646 | bh = sb_getblk(sb, block); | |
ac27a0ec | 4647 | if (!bh) { |
c398eda0 TT |
4648 | EXT4_ERROR_INODE_BLOCK(inode, block, |
4649 | "unable to read itable block"); | |
ac27a0ec DK |
4650 | return -EIO; |
4651 | } | |
4652 | if (!buffer_uptodate(bh)) { | |
4653 | lock_buffer(bh); | |
9c83a923 HK |
4654 | |
4655 | /* | |
4656 | * If the buffer has the write error flag, we have failed | |
4657 | * to write out another inode in the same block. In this | |
4658 | * case, we don't have to read the block because we may | |
4659 | * read the old inode data successfully. | |
4660 | */ | |
4661 | if (buffer_write_io_error(bh) && !buffer_uptodate(bh)) | |
4662 | set_buffer_uptodate(bh); | |
4663 | ||
ac27a0ec DK |
4664 | if (buffer_uptodate(bh)) { |
4665 | /* someone brought it uptodate while we waited */ | |
4666 | unlock_buffer(bh); | |
4667 | goto has_buffer; | |
4668 | } | |
4669 | ||
4670 | /* | |
4671 | * If we have all information of the inode in memory and this | |
4672 | * is the only valid inode in the block, we need not read the | |
4673 | * block. | |
4674 | */ | |
4675 | if (in_mem) { | |
4676 | struct buffer_head *bitmap_bh; | |
240799cd | 4677 | int i, start; |
ac27a0ec | 4678 | |
240799cd | 4679 | start = inode_offset & ~(inodes_per_block - 1); |
ac27a0ec | 4680 | |
240799cd TT |
4681 | /* Is the inode bitmap in cache? */ |
4682 | bitmap_bh = sb_getblk(sb, ext4_inode_bitmap(sb, gdp)); | |
ac27a0ec DK |
4683 | if (!bitmap_bh) |
4684 | goto make_io; | |
4685 | ||
4686 | /* | |
4687 | * If the inode bitmap isn't in cache then the | |
4688 | * optimisation may end up performing two reads instead | |
4689 | * of one, so skip it. | |
4690 | */ | |
4691 | if (!buffer_uptodate(bitmap_bh)) { | |
4692 | brelse(bitmap_bh); | |
4693 | goto make_io; | |
4694 | } | |
240799cd | 4695 | for (i = start; i < start + inodes_per_block; i++) { |
ac27a0ec DK |
4696 | if (i == inode_offset) |
4697 | continue; | |
617ba13b | 4698 | if (ext4_test_bit(i, bitmap_bh->b_data)) |
ac27a0ec DK |
4699 | break; |
4700 | } | |
4701 | brelse(bitmap_bh); | |
240799cd | 4702 | if (i == start + inodes_per_block) { |
ac27a0ec DK |
4703 | /* all other inodes are free, so skip I/O */ |
4704 | memset(bh->b_data, 0, bh->b_size); | |
4705 | set_buffer_uptodate(bh); | |
4706 | unlock_buffer(bh); | |
4707 | goto has_buffer; | |
4708 | } | |
4709 | } | |
4710 | ||
4711 | make_io: | |
240799cd TT |
4712 | /* |
4713 | * If we need to do any I/O, try to pre-readahead extra | |
4714 | * blocks from the inode table. | |
4715 | */ | |
4716 | if (EXT4_SB(sb)->s_inode_readahead_blks) { | |
4717 | ext4_fsblk_t b, end, table; | |
4718 | unsigned num; | |
4719 | ||
4720 | table = ext4_inode_table(sb, gdp); | |
b713a5ec | 4721 | /* s_inode_readahead_blks is always a power of 2 */ |
240799cd TT |
4722 | b = block & ~(EXT4_SB(sb)->s_inode_readahead_blks-1); |
4723 | if (table > b) | |
4724 | b = table; | |
4725 | end = b + EXT4_SB(sb)->s_inode_readahead_blks; | |
4726 | num = EXT4_INODES_PER_GROUP(sb); | |
4727 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
4728 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) | |
560671a0 | 4729 | num -= ext4_itable_unused_count(sb, gdp); |
240799cd TT |
4730 | table += num / inodes_per_block; |
4731 | if (end > table) | |
4732 | end = table; | |
4733 | while (b <= end) | |
4734 | sb_breadahead(sb, b++); | |
4735 | } | |
4736 | ||
ac27a0ec DK |
4737 | /* |
4738 | * There are other valid inodes in the buffer, this inode | |
4739 | * has in-inode xattrs, or we don't have this inode in memory. | |
4740 | * Read the block from disk. | |
4741 | */ | |
4742 | get_bh(bh); | |
4743 | bh->b_end_io = end_buffer_read_sync; | |
4744 | submit_bh(READ_META, bh); | |
4745 | wait_on_buffer(bh); | |
4746 | if (!buffer_uptodate(bh)) { | |
c398eda0 TT |
4747 | EXT4_ERROR_INODE_BLOCK(inode, block, |
4748 | "unable to read itable block"); | |
ac27a0ec DK |
4749 | brelse(bh); |
4750 | return -EIO; | |
4751 | } | |
4752 | } | |
4753 | has_buffer: | |
4754 | iloc->bh = bh; | |
4755 | return 0; | |
4756 | } | |
4757 | ||
617ba13b | 4758 | int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc) |
ac27a0ec DK |
4759 | { |
4760 | /* We have all inode data except xattrs in memory here. */ | |
617ba13b | 4761 | return __ext4_get_inode_loc(inode, iloc, |
19f5fb7a | 4762 | !ext4_test_inode_state(inode, EXT4_STATE_XATTR)); |
ac27a0ec DK |
4763 | } |
4764 | ||
617ba13b | 4765 | void ext4_set_inode_flags(struct inode *inode) |
ac27a0ec | 4766 | { |
617ba13b | 4767 | unsigned int flags = EXT4_I(inode)->i_flags; |
ac27a0ec DK |
4768 | |
4769 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
617ba13b | 4770 | if (flags & EXT4_SYNC_FL) |
ac27a0ec | 4771 | inode->i_flags |= S_SYNC; |
617ba13b | 4772 | if (flags & EXT4_APPEND_FL) |
ac27a0ec | 4773 | inode->i_flags |= S_APPEND; |
617ba13b | 4774 | if (flags & EXT4_IMMUTABLE_FL) |
ac27a0ec | 4775 | inode->i_flags |= S_IMMUTABLE; |
617ba13b | 4776 | if (flags & EXT4_NOATIME_FL) |
ac27a0ec | 4777 | inode->i_flags |= S_NOATIME; |
617ba13b | 4778 | if (flags & EXT4_DIRSYNC_FL) |
ac27a0ec DK |
4779 | inode->i_flags |= S_DIRSYNC; |
4780 | } | |
4781 | ||
ff9ddf7e JK |
4782 | /* Propagate flags from i_flags to EXT4_I(inode)->i_flags */ |
4783 | void ext4_get_inode_flags(struct ext4_inode_info *ei) | |
4784 | { | |
84a8dce2 DM |
4785 | unsigned int vfs_fl; |
4786 | unsigned long old_fl, new_fl; | |
4787 | ||
4788 | do { | |
4789 | vfs_fl = ei->vfs_inode.i_flags; | |
4790 | old_fl = ei->i_flags; | |
4791 | new_fl = old_fl & ~(EXT4_SYNC_FL|EXT4_APPEND_FL| | |
4792 | EXT4_IMMUTABLE_FL|EXT4_NOATIME_FL| | |
4793 | EXT4_DIRSYNC_FL); | |
4794 | if (vfs_fl & S_SYNC) | |
4795 | new_fl |= EXT4_SYNC_FL; | |
4796 | if (vfs_fl & S_APPEND) | |
4797 | new_fl |= EXT4_APPEND_FL; | |
4798 | if (vfs_fl & S_IMMUTABLE) | |
4799 | new_fl |= EXT4_IMMUTABLE_FL; | |
4800 | if (vfs_fl & S_NOATIME) | |
4801 | new_fl |= EXT4_NOATIME_FL; | |
4802 | if (vfs_fl & S_DIRSYNC) | |
4803 | new_fl |= EXT4_DIRSYNC_FL; | |
4804 | } while (cmpxchg(&ei->i_flags, old_fl, new_fl) != old_fl); | |
ff9ddf7e | 4805 | } |
de9a55b8 | 4806 | |
0fc1b451 | 4807 | static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode, |
de9a55b8 | 4808 | struct ext4_inode_info *ei) |
0fc1b451 AK |
4809 | { |
4810 | blkcnt_t i_blocks ; | |
8180a562 AK |
4811 | struct inode *inode = &(ei->vfs_inode); |
4812 | struct super_block *sb = inode->i_sb; | |
0fc1b451 AK |
4813 | |
4814 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
4815 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { | |
4816 | /* we are using combined 48 bit field */ | |
4817 | i_blocks = ((u64)le16_to_cpu(raw_inode->i_blocks_high)) << 32 | | |
4818 | le32_to_cpu(raw_inode->i_blocks_lo); | |
07a03824 | 4819 | if (ext4_test_inode_flag(inode, EXT4_INODE_HUGE_FILE)) { |
8180a562 AK |
4820 | /* i_blocks represent file system block size */ |
4821 | return i_blocks << (inode->i_blkbits - 9); | |
4822 | } else { | |
4823 | return i_blocks; | |
4824 | } | |
0fc1b451 AK |
4825 | } else { |
4826 | return le32_to_cpu(raw_inode->i_blocks_lo); | |
4827 | } | |
4828 | } | |
ff9ddf7e | 4829 | |
1d1fe1ee | 4830 | struct inode *ext4_iget(struct super_block *sb, unsigned long ino) |
ac27a0ec | 4831 | { |
617ba13b MC |
4832 | struct ext4_iloc iloc; |
4833 | struct ext4_inode *raw_inode; | |
1d1fe1ee | 4834 | struct ext4_inode_info *ei; |
1d1fe1ee | 4835 | struct inode *inode; |
b436b9be | 4836 | journal_t *journal = EXT4_SB(sb)->s_journal; |
1d1fe1ee | 4837 | long ret; |
ac27a0ec DK |
4838 | int block; |
4839 | ||
1d1fe1ee DH |
4840 | inode = iget_locked(sb, ino); |
4841 | if (!inode) | |
4842 | return ERR_PTR(-ENOMEM); | |
4843 | if (!(inode->i_state & I_NEW)) | |
4844 | return inode; | |
4845 | ||
4846 | ei = EXT4_I(inode); | |
567f3e9a | 4847 | iloc.bh = 0; |
ac27a0ec | 4848 | |
1d1fe1ee DH |
4849 | ret = __ext4_get_inode_loc(inode, &iloc, 0); |
4850 | if (ret < 0) | |
ac27a0ec | 4851 | goto bad_inode; |
617ba13b | 4852 | raw_inode = ext4_raw_inode(&iloc); |
ac27a0ec DK |
4853 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); |
4854 | inode->i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low); | |
4855 | inode->i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low); | |
af5bc92d | 4856 | if (!(test_opt(inode->i_sb, NO_UID32))) { |
ac27a0ec DK |
4857 | inode->i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16; |
4858 | inode->i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16; | |
4859 | } | |
4860 | inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); | |
ac27a0ec | 4861 | |
19f5fb7a | 4862 | ei->i_state_flags = 0; |
ac27a0ec DK |
4863 | ei->i_dir_start_lookup = 0; |
4864 | ei->i_dtime = le32_to_cpu(raw_inode->i_dtime); | |
4865 | /* We now have enough fields to check if the inode was active or not. | |
4866 | * This is needed because nfsd might try to access dead inodes | |
4867 | * the test is that same one that e2fsck uses | |
4868 | * NeilBrown 1999oct15 | |
4869 | */ | |
4870 | if (inode->i_nlink == 0) { | |
4871 | if (inode->i_mode == 0 || | |
617ba13b | 4872 | !(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ORPHAN_FS)) { |
ac27a0ec | 4873 | /* this inode is deleted */ |
1d1fe1ee | 4874 | ret = -ESTALE; |
ac27a0ec DK |
4875 | goto bad_inode; |
4876 | } | |
4877 | /* The only unlinked inodes we let through here have | |
4878 | * valid i_mode and are being read by the orphan | |
4879 | * recovery code: that's fine, we're about to complete | |
4880 | * the process of deleting those. */ | |
4881 | } | |
ac27a0ec | 4882 | ei->i_flags = le32_to_cpu(raw_inode->i_flags); |
0fc1b451 | 4883 | inode->i_blocks = ext4_inode_blocks(raw_inode, ei); |
7973c0c1 | 4884 | ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl_lo); |
a9e81742 | 4885 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) |
a1ddeb7e BP |
4886 | ei->i_file_acl |= |
4887 | ((__u64)le16_to_cpu(raw_inode->i_file_acl_high)) << 32; | |
a48380f7 | 4888 | inode->i_size = ext4_isize(raw_inode); |
ac27a0ec | 4889 | ei->i_disksize = inode->i_size; |
a9e7f447 DM |
4890 | #ifdef CONFIG_QUOTA |
4891 | ei->i_reserved_quota = 0; | |
4892 | #endif | |
ac27a0ec DK |
4893 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
4894 | ei->i_block_group = iloc.block_group; | |
a4912123 | 4895 | ei->i_last_alloc_group = ~0; |
ac27a0ec DK |
4896 | /* |
4897 | * NOTE! The in-memory inode i_data array is in little-endian order | |
4898 | * even on big-endian machines: we do NOT byteswap the block numbers! | |
4899 | */ | |
617ba13b | 4900 | for (block = 0; block < EXT4_N_BLOCKS; block++) |
ac27a0ec DK |
4901 | ei->i_data[block] = raw_inode->i_block[block]; |
4902 | INIT_LIST_HEAD(&ei->i_orphan); | |
4903 | ||
b436b9be JK |
4904 | /* |
4905 | * Set transaction id's of transactions that have to be committed | |
4906 | * to finish f[data]sync. We set them to currently running transaction | |
4907 | * as we cannot be sure that the inode or some of its metadata isn't | |
4908 | * part of the transaction - the inode could have been reclaimed and | |
4909 | * now it is reread from disk. | |
4910 | */ | |
4911 | if (journal) { | |
4912 | transaction_t *transaction; | |
4913 | tid_t tid; | |
4914 | ||
a931da6a | 4915 | read_lock(&journal->j_state_lock); |
b436b9be JK |
4916 | if (journal->j_running_transaction) |
4917 | transaction = journal->j_running_transaction; | |
4918 | else | |
4919 | transaction = journal->j_committing_transaction; | |
4920 | if (transaction) | |
4921 | tid = transaction->t_tid; | |
4922 | else | |
4923 | tid = journal->j_commit_sequence; | |
a931da6a | 4924 | read_unlock(&journal->j_state_lock); |
b436b9be JK |
4925 | ei->i_sync_tid = tid; |
4926 | ei->i_datasync_tid = tid; | |
4927 | } | |
4928 | ||
0040d987 | 4929 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { |
ac27a0ec | 4930 | ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize); |
617ba13b | 4931 | if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize > |
e5d2861f | 4932 | EXT4_INODE_SIZE(inode->i_sb)) { |
1d1fe1ee | 4933 | ret = -EIO; |
ac27a0ec | 4934 | goto bad_inode; |
e5d2861f | 4935 | } |
ac27a0ec DK |
4936 | if (ei->i_extra_isize == 0) { |
4937 | /* The extra space is currently unused. Use it. */ | |
617ba13b MC |
4938 | ei->i_extra_isize = sizeof(struct ext4_inode) - |
4939 | EXT4_GOOD_OLD_INODE_SIZE; | |
ac27a0ec DK |
4940 | } else { |
4941 | __le32 *magic = (void *)raw_inode + | |
617ba13b | 4942 | EXT4_GOOD_OLD_INODE_SIZE + |
ac27a0ec | 4943 | ei->i_extra_isize; |
617ba13b | 4944 | if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC)) |
19f5fb7a | 4945 | ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
ac27a0ec DK |
4946 | } |
4947 | } else | |
4948 | ei->i_extra_isize = 0; | |
4949 | ||
ef7f3835 KS |
4950 | EXT4_INODE_GET_XTIME(i_ctime, inode, raw_inode); |
4951 | EXT4_INODE_GET_XTIME(i_mtime, inode, raw_inode); | |
4952 | EXT4_INODE_GET_XTIME(i_atime, inode, raw_inode); | |
4953 | EXT4_EINODE_GET_XTIME(i_crtime, ei, raw_inode); | |
4954 | ||
25ec56b5 JNC |
4955 | inode->i_version = le32_to_cpu(raw_inode->i_disk_version); |
4956 | if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) { | |
4957 | if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) | |
4958 | inode->i_version |= | |
4959 | (__u64)(le32_to_cpu(raw_inode->i_version_hi)) << 32; | |
4960 | } | |
4961 | ||
c4b5a614 | 4962 | ret = 0; |
485c26ec | 4963 | if (ei->i_file_acl && |
1032988c | 4964 | !ext4_data_block_valid(EXT4_SB(sb), ei->i_file_acl, 1)) { |
24676da4 TT |
4965 | EXT4_ERROR_INODE(inode, "bad extended attribute block %llu", |
4966 | ei->i_file_acl); | |
485c26ec TT |
4967 | ret = -EIO; |
4968 | goto bad_inode; | |
07a03824 | 4969 | } else if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { |
c4b5a614 TT |
4970 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
4971 | (S_ISLNK(inode->i_mode) && | |
4972 | !ext4_inode_is_fast_symlink(inode))) | |
4973 | /* Validate extent which is part of inode */ | |
4974 | ret = ext4_ext_check_inode(inode); | |
de9a55b8 | 4975 | } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
fe2c8191 TN |
4976 | (S_ISLNK(inode->i_mode) && |
4977 | !ext4_inode_is_fast_symlink(inode))) { | |
de9a55b8 | 4978 | /* Validate block references which are part of inode */ |
fe2c8191 TN |
4979 | ret = ext4_check_inode_blockref(inode); |
4980 | } | |
567f3e9a | 4981 | if (ret) |
de9a55b8 | 4982 | goto bad_inode; |
7a262f7c | 4983 | |
ac27a0ec | 4984 | if (S_ISREG(inode->i_mode)) { |
617ba13b MC |
4985 | inode->i_op = &ext4_file_inode_operations; |
4986 | inode->i_fop = &ext4_file_operations; | |
4987 | ext4_set_aops(inode); | |
ac27a0ec | 4988 | } else if (S_ISDIR(inode->i_mode)) { |
617ba13b MC |
4989 | inode->i_op = &ext4_dir_inode_operations; |
4990 | inode->i_fop = &ext4_dir_operations; | |
ac27a0ec | 4991 | } else if (S_ISLNK(inode->i_mode)) { |
e83c1397 | 4992 | if (ext4_inode_is_fast_symlink(inode)) { |
617ba13b | 4993 | inode->i_op = &ext4_fast_symlink_inode_operations; |
e83c1397 DG |
4994 | nd_terminate_link(ei->i_data, inode->i_size, |
4995 | sizeof(ei->i_data) - 1); | |
4996 | } else { | |
617ba13b MC |
4997 | inode->i_op = &ext4_symlink_inode_operations; |
4998 | ext4_set_aops(inode); | |
ac27a0ec | 4999 | } |
563bdd61 TT |
5000 | } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || |
5001 | S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { | |
617ba13b | 5002 | inode->i_op = &ext4_special_inode_operations; |
ac27a0ec DK |
5003 | if (raw_inode->i_block[0]) |
5004 | init_special_inode(inode, inode->i_mode, | |
5005 | old_decode_dev(le32_to_cpu(raw_inode->i_block[0]))); | |
5006 | else | |
5007 | init_special_inode(inode, inode->i_mode, | |
5008 | new_decode_dev(le32_to_cpu(raw_inode->i_block[1]))); | |
563bdd61 | 5009 | } else { |
563bdd61 | 5010 | ret = -EIO; |
24676da4 | 5011 | EXT4_ERROR_INODE(inode, "bogus i_mode (%o)", inode->i_mode); |
563bdd61 | 5012 | goto bad_inode; |
ac27a0ec | 5013 | } |
af5bc92d | 5014 | brelse(iloc.bh); |
617ba13b | 5015 | ext4_set_inode_flags(inode); |
1d1fe1ee DH |
5016 | unlock_new_inode(inode); |
5017 | return inode; | |
ac27a0ec DK |
5018 | |
5019 | bad_inode: | |
567f3e9a | 5020 | brelse(iloc.bh); |
1d1fe1ee DH |
5021 | iget_failed(inode); |
5022 | return ERR_PTR(ret); | |
ac27a0ec DK |
5023 | } |
5024 | ||
0fc1b451 AK |
5025 | static int ext4_inode_blocks_set(handle_t *handle, |
5026 | struct ext4_inode *raw_inode, | |
5027 | struct ext4_inode_info *ei) | |
5028 | { | |
5029 | struct inode *inode = &(ei->vfs_inode); | |
5030 | u64 i_blocks = inode->i_blocks; | |
5031 | struct super_block *sb = inode->i_sb; | |
0fc1b451 AK |
5032 | |
5033 | if (i_blocks <= ~0U) { | |
5034 | /* | |
5035 | * i_blocks can be represnted in a 32 bit variable | |
5036 | * as multiple of 512 bytes | |
5037 | */ | |
8180a562 | 5038 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); |
0fc1b451 | 5039 | raw_inode->i_blocks_high = 0; |
84a8dce2 | 5040 | ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
f287a1a5 TT |
5041 | return 0; |
5042 | } | |
5043 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) | |
5044 | return -EFBIG; | |
5045 | ||
5046 | if (i_blocks <= 0xffffffffffffULL) { | |
0fc1b451 AK |
5047 | /* |
5048 | * i_blocks can be represented in a 48 bit variable | |
5049 | * as multiple of 512 bytes | |
5050 | */ | |
8180a562 | 5051 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); |
0fc1b451 | 5052 | raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); |
84a8dce2 | 5053 | ext4_clear_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
0fc1b451 | 5054 | } else { |
84a8dce2 | 5055 | ext4_set_inode_flag(inode, EXT4_INODE_HUGE_FILE); |
8180a562 AK |
5056 | /* i_block is stored in file system block size */ |
5057 | i_blocks = i_blocks >> (inode->i_blkbits - 9); | |
5058 | raw_inode->i_blocks_lo = cpu_to_le32(i_blocks); | |
5059 | raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); | |
0fc1b451 | 5060 | } |
f287a1a5 | 5061 | return 0; |
0fc1b451 AK |
5062 | } |
5063 | ||
ac27a0ec DK |
5064 | /* |
5065 | * Post the struct inode info into an on-disk inode location in the | |
5066 | * buffer-cache. This gobbles the caller's reference to the | |
5067 | * buffer_head in the inode location struct. | |
5068 | * | |
5069 | * The caller must have write access to iloc->bh. | |
5070 | */ | |
617ba13b | 5071 | static int ext4_do_update_inode(handle_t *handle, |
ac27a0ec | 5072 | struct inode *inode, |
830156c7 | 5073 | struct ext4_iloc *iloc) |
ac27a0ec | 5074 | { |
617ba13b MC |
5075 | struct ext4_inode *raw_inode = ext4_raw_inode(iloc); |
5076 | struct ext4_inode_info *ei = EXT4_I(inode); | |
ac27a0ec DK |
5077 | struct buffer_head *bh = iloc->bh; |
5078 | int err = 0, rc, block; | |
5079 | ||
5080 | /* For fields not not tracking in the in-memory inode, | |
5081 | * initialise them to zero for new inodes. */ | |
19f5fb7a | 5082 | if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) |
617ba13b | 5083 | memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); |
ac27a0ec | 5084 | |
ff9ddf7e | 5085 | ext4_get_inode_flags(ei); |
ac27a0ec | 5086 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); |
af5bc92d | 5087 | if (!(test_opt(inode->i_sb, NO_UID32))) { |
ac27a0ec DK |
5088 | raw_inode->i_uid_low = cpu_to_le16(low_16_bits(inode->i_uid)); |
5089 | raw_inode->i_gid_low = cpu_to_le16(low_16_bits(inode->i_gid)); | |
5090 | /* | |
5091 | * Fix up interoperability with old kernels. Otherwise, old inodes get | |
5092 | * re-used with the upper 16 bits of the uid/gid intact | |
5093 | */ | |
af5bc92d | 5094 | if (!ei->i_dtime) { |
ac27a0ec DK |
5095 | raw_inode->i_uid_high = |
5096 | cpu_to_le16(high_16_bits(inode->i_uid)); | |
5097 | raw_inode->i_gid_high = | |
5098 | cpu_to_le16(high_16_bits(inode->i_gid)); | |
5099 | } else { | |
5100 | raw_inode->i_uid_high = 0; | |
5101 | raw_inode->i_gid_high = 0; | |
5102 | } | |
5103 | } else { | |
5104 | raw_inode->i_uid_low = | |
5105 | cpu_to_le16(fs_high2lowuid(inode->i_uid)); | |
5106 | raw_inode->i_gid_low = | |
5107 | cpu_to_le16(fs_high2lowgid(inode->i_gid)); | |
5108 | raw_inode->i_uid_high = 0; | |
5109 | raw_inode->i_gid_high = 0; | |
5110 | } | |
5111 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
ef7f3835 KS |
5112 | |
5113 | EXT4_INODE_SET_XTIME(i_ctime, inode, raw_inode); | |
5114 | EXT4_INODE_SET_XTIME(i_mtime, inode, raw_inode); | |
5115 | EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode); | |
5116 | EXT4_EINODE_SET_XTIME(i_crtime, ei, raw_inode); | |
5117 | ||
0fc1b451 AK |
5118 | if (ext4_inode_blocks_set(handle, raw_inode, ei)) |
5119 | goto out_brelse; | |
ac27a0ec | 5120 | raw_inode->i_dtime = cpu_to_le32(ei->i_dtime); |
1b9c12f4 | 5121 | raw_inode->i_flags = cpu_to_le32(ei->i_flags); |
9b8f1f01 MC |
5122 | if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != |
5123 | cpu_to_le32(EXT4_OS_HURD)) | |
a1ddeb7e BP |
5124 | raw_inode->i_file_acl_high = |
5125 | cpu_to_le16(ei->i_file_acl >> 32); | |
7973c0c1 | 5126 | raw_inode->i_file_acl_lo = cpu_to_le32(ei->i_file_acl); |
a48380f7 AK |
5127 | ext4_isize_set(raw_inode, ei->i_disksize); |
5128 | if (ei->i_disksize > 0x7fffffffULL) { | |
5129 | struct super_block *sb = inode->i_sb; | |
5130 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
5131 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE) || | |
5132 | EXT4_SB(sb)->s_es->s_rev_level == | |
5133 | cpu_to_le32(EXT4_GOOD_OLD_REV)) { | |
5134 | /* If this is the first large file | |
5135 | * created, add a flag to the superblock. | |
5136 | */ | |
5137 | err = ext4_journal_get_write_access(handle, | |
5138 | EXT4_SB(sb)->s_sbh); | |
5139 | if (err) | |
5140 | goto out_brelse; | |
5141 | ext4_update_dynamic_rev(sb); | |
5142 | EXT4_SET_RO_COMPAT_FEATURE(sb, | |
617ba13b | 5143 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE); |
a48380f7 | 5144 | sb->s_dirt = 1; |
0390131b | 5145 | ext4_handle_sync(handle); |
73b50c1c | 5146 | err = ext4_handle_dirty_metadata(handle, NULL, |
a48380f7 | 5147 | EXT4_SB(sb)->s_sbh); |
ac27a0ec DK |
5148 | } |
5149 | } | |
5150 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
5151 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
5152 | if (old_valid_dev(inode->i_rdev)) { | |
5153 | raw_inode->i_block[0] = | |
5154 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
5155 | raw_inode->i_block[1] = 0; | |
5156 | } else { | |
5157 | raw_inode->i_block[0] = 0; | |
5158 | raw_inode->i_block[1] = | |
5159 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
5160 | raw_inode->i_block[2] = 0; | |
5161 | } | |
de9a55b8 TT |
5162 | } else |
5163 | for (block = 0; block < EXT4_N_BLOCKS; block++) | |
5164 | raw_inode->i_block[block] = ei->i_data[block]; | |
ac27a0ec | 5165 | |
25ec56b5 JNC |
5166 | raw_inode->i_disk_version = cpu_to_le32(inode->i_version); |
5167 | if (ei->i_extra_isize) { | |
5168 | if (EXT4_FITS_IN_INODE(raw_inode, ei, i_version_hi)) | |
5169 | raw_inode->i_version_hi = | |
5170 | cpu_to_le32(inode->i_version >> 32); | |
ac27a0ec | 5171 | raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize); |
25ec56b5 JNC |
5172 | } |
5173 | ||
830156c7 | 5174 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); |
73b50c1c | 5175 | rc = ext4_handle_dirty_metadata(handle, NULL, bh); |
830156c7 FM |
5176 | if (!err) |
5177 | err = rc; | |
19f5fb7a | 5178 | ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
ac27a0ec | 5179 | |
b436b9be | 5180 | ext4_update_inode_fsync_trans(handle, inode, 0); |
ac27a0ec | 5181 | out_brelse: |
af5bc92d | 5182 | brelse(bh); |
617ba13b | 5183 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
5184 | return err; |
5185 | } | |
5186 | ||
5187 | /* | |
617ba13b | 5188 | * ext4_write_inode() |
ac27a0ec DK |
5189 | * |
5190 | * We are called from a few places: | |
5191 | * | |
5192 | * - Within generic_file_write() for O_SYNC files. | |
5193 | * Here, there will be no transaction running. We wait for any running | |
5194 | * trasnaction to commit. | |
5195 | * | |
5196 | * - Within sys_sync(), kupdate and such. | |
5197 | * We wait on commit, if tol to. | |
5198 | * | |
5199 | * - Within prune_icache() (PF_MEMALLOC == true) | |
5200 | * Here we simply return. We can't afford to block kswapd on the | |
5201 | * journal commit. | |
5202 | * | |
5203 | * In all cases it is actually safe for us to return without doing anything, | |
5204 | * because the inode has been copied into a raw inode buffer in | |
617ba13b | 5205 | * ext4_mark_inode_dirty(). This is a correctness thing for O_SYNC and for |
ac27a0ec DK |
5206 | * knfsd. |
5207 | * | |
5208 | * Note that we are absolutely dependent upon all inode dirtiers doing the | |
5209 | * right thing: they *must* call mark_inode_dirty() after dirtying info in | |
5210 | * which we are interested. | |
5211 | * | |
5212 | * It would be a bug for them to not do this. The code: | |
5213 | * | |
5214 | * mark_inode_dirty(inode) | |
5215 | * stuff(); | |
5216 | * inode->i_size = expr; | |
5217 | * | |
5218 | * is in error because a kswapd-driven write_inode() could occur while | |
5219 | * `stuff()' is running, and the new i_size will be lost. Plus the inode | |
5220 | * will no longer be on the superblock's dirty inode list. | |
5221 | */ | |
a9185b41 | 5222 | int ext4_write_inode(struct inode *inode, struct writeback_control *wbc) |
ac27a0ec | 5223 | { |
91ac6f43 FM |
5224 | int err; |
5225 | ||
ac27a0ec DK |
5226 | if (current->flags & PF_MEMALLOC) |
5227 | return 0; | |
5228 | ||
91ac6f43 FM |
5229 | if (EXT4_SB(inode->i_sb)->s_journal) { |
5230 | if (ext4_journal_current_handle()) { | |
5231 | jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n"); | |
5232 | dump_stack(); | |
5233 | return -EIO; | |
5234 | } | |
ac27a0ec | 5235 | |
a9185b41 | 5236 | if (wbc->sync_mode != WB_SYNC_ALL) |
91ac6f43 FM |
5237 | return 0; |
5238 | ||
5239 | err = ext4_force_commit(inode->i_sb); | |
5240 | } else { | |
5241 | struct ext4_iloc iloc; | |
ac27a0ec | 5242 | |
8b472d73 | 5243 | err = __ext4_get_inode_loc(inode, &iloc, 0); |
91ac6f43 FM |
5244 | if (err) |
5245 | return err; | |
a9185b41 | 5246 | if (wbc->sync_mode == WB_SYNC_ALL) |
830156c7 FM |
5247 | sync_dirty_buffer(iloc.bh); |
5248 | if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) { | |
c398eda0 TT |
5249 | EXT4_ERROR_INODE_BLOCK(inode, iloc.bh->b_blocknr, |
5250 | "IO error syncing inode"); | |
830156c7 FM |
5251 | err = -EIO; |
5252 | } | |
fd2dd9fb | 5253 | brelse(iloc.bh); |
91ac6f43 FM |
5254 | } |
5255 | return err; | |
ac27a0ec DK |
5256 | } |
5257 | ||
5258 | /* | |
617ba13b | 5259 | * ext4_setattr() |
ac27a0ec DK |
5260 | * |
5261 | * Called from notify_change. | |
5262 | * | |
5263 | * We want to trap VFS attempts to truncate the file as soon as | |
5264 | * possible. In particular, we want to make sure that when the VFS | |
5265 | * shrinks i_size, we put the inode on the orphan list and modify | |
5266 | * i_disksize immediately, so that during the subsequent flushing of | |
5267 | * dirty pages and freeing of disk blocks, we can guarantee that any | |
5268 | * commit will leave the blocks being flushed in an unused state on | |
5269 | * disk. (On recovery, the inode will get truncated and the blocks will | |
5270 | * be freed, so we have a strong guarantee that no future commit will | |
5271 | * leave these blocks visible to the user.) | |
5272 | * | |
678aaf48 JK |
5273 | * Another thing we have to assure is that if we are in ordered mode |
5274 | * and inode is still attached to the committing transaction, we must | |
5275 | * we start writeout of all the dirty pages which are being truncated. | |
5276 | * This way we are sure that all the data written in the previous | |
5277 | * transaction are already on disk (truncate waits for pages under | |
5278 | * writeback). | |
5279 | * | |
5280 | * Called with inode->i_mutex down. | |
ac27a0ec | 5281 | */ |
617ba13b | 5282 | int ext4_setattr(struct dentry *dentry, struct iattr *attr) |
ac27a0ec DK |
5283 | { |
5284 | struct inode *inode = dentry->d_inode; | |
5285 | int error, rc = 0; | |
3d287de3 | 5286 | int orphan = 0; |
ac27a0ec DK |
5287 | const unsigned int ia_valid = attr->ia_valid; |
5288 | ||
5289 | error = inode_change_ok(inode, attr); | |
5290 | if (error) | |
5291 | return error; | |
5292 | ||
12755627 | 5293 | if (is_quota_modification(inode, attr)) |
871a2931 | 5294 | dquot_initialize(inode); |
ac27a0ec DK |
5295 | if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) || |
5296 | (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) { | |
5297 | handle_t *handle; | |
5298 | ||
5299 | /* (user+group)*(old+new) structure, inode write (sb, | |
5300 | * inode block, ? - but truncate inode update has it) */ | |
5aca07eb | 5301 | handle = ext4_journal_start(inode, (EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)+ |
194074ac | 5302 | EXT4_MAXQUOTAS_DEL_BLOCKS(inode->i_sb))+3); |
ac27a0ec DK |
5303 | if (IS_ERR(handle)) { |
5304 | error = PTR_ERR(handle); | |
5305 | goto err_out; | |
5306 | } | |
b43fa828 | 5307 | error = dquot_transfer(inode, attr); |
ac27a0ec | 5308 | if (error) { |
617ba13b | 5309 | ext4_journal_stop(handle); |
ac27a0ec DK |
5310 | return error; |
5311 | } | |
5312 | /* Update corresponding info in inode so that everything is in | |
5313 | * one transaction */ | |
5314 | if (attr->ia_valid & ATTR_UID) | |
5315 | inode->i_uid = attr->ia_uid; | |
5316 | if (attr->ia_valid & ATTR_GID) | |
5317 | inode->i_gid = attr->ia_gid; | |
617ba13b MC |
5318 | error = ext4_mark_inode_dirty(handle, inode); |
5319 | ext4_journal_stop(handle); | |
ac27a0ec DK |
5320 | } |
5321 | ||
e2b46574 | 5322 | if (attr->ia_valid & ATTR_SIZE) { |
12e9b892 | 5323 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { |
e2b46574 ES |
5324 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
5325 | ||
0c095c7f TT |
5326 | if (attr->ia_size > sbi->s_bitmap_maxbytes) |
5327 | return -EFBIG; | |
e2b46574 ES |
5328 | } |
5329 | } | |
5330 | ||
ac27a0ec | 5331 | if (S_ISREG(inode->i_mode) && |
c8d46e41 JZ |
5332 | attr->ia_valid & ATTR_SIZE && |
5333 | (attr->ia_size < inode->i_size || | |
12e9b892 | 5334 | (ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS)))) { |
ac27a0ec DK |
5335 | handle_t *handle; |
5336 | ||
617ba13b | 5337 | handle = ext4_journal_start(inode, 3); |
ac27a0ec DK |
5338 | if (IS_ERR(handle)) { |
5339 | error = PTR_ERR(handle); | |
5340 | goto err_out; | |
5341 | } | |
3d287de3 DM |
5342 | if (ext4_handle_valid(handle)) { |
5343 | error = ext4_orphan_add(handle, inode); | |
5344 | orphan = 1; | |
5345 | } | |
617ba13b MC |
5346 | EXT4_I(inode)->i_disksize = attr->ia_size; |
5347 | rc = ext4_mark_inode_dirty(handle, inode); | |
ac27a0ec DK |
5348 | if (!error) |
5349 | error = rc; | |
617ba13b | 5350 | ext4_journal_stop(handle); |
678aaf48 JK |
5351 | |
5352 | if (ext4_should_order_data(inode)) { | |
5353 | error = ext4_begin_ordered_truncate(inode, | |
5354 | attr->ia_size); | |
5355 | if (error) { | |
5356 | /* Do as much error cleanup as possible */ | |
5357 | handle = ext4_journal_start(inode, 3); | |
5358 | if (IS_ERR(handle)) { | |
5359 | ext4_orphan_del(NULL, inode); | |
5360 | goto err_out; | |
5361 | } | |
5362 | ext4_orphan_del(handle, inode); | |
3d287de3 | 5363 | orphan = 0; |
678aaf48 JK |
5364 | ext4_journal_stop(handle); |
5365 | goto err_out; | |
5366 | } | |
5367 | } | |
c8d46e41 | 5368 | /* ext4_truncate will clear the flag */ |
12e9b892 | 5369 | if ((ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS))) |
c8d46e41 | 5370 | ext4_truncate(inode); |
ac27a0ec DK |
5371 | } |
5372 | ||
1025774c CH |
5373 | if ((attr->ia_valid & ATTR_SIZE) && |
5374 | attr->ia_size != i_size_read(inode)) | |
5375 | rc = vmtruncate(inode, attr->ia_size); | |
ac27a0ec | 5376 | |
1025774c CH |
5377 | if (!rc) { |
5378 | setattr_copy(inode, attr); | |
5379 | mark_inode_dirty(inode); | |
5380 | } | |
5381 | ||
5382 | /* | |
5383 | * If the call to ext4_truncate failed to get a transaction handle at | |
5384 | * all, we need to clean up the in-core orphan list manually. | |
5385 | */ | |
3d287de3 | 5386 | if (orphan && inode->i_nlink) |
617ba13b | 5387 | ext4_orphan_del(NULL, inode); |
ac27a0ec DK |
5388 | |
5389 | if (!rc && (ia_valid & ATTR_MODE)) | |
617ba13b | 5390 | rc = ext4_acl_chmod(inode); |
ac27a0ec DK |
5391 | |
5392 | err_out: | |
617ba13b | 5393 | ext4_std_error(inode->i_sb, error); |
ac27a0ec DK |
5394 | if (!error) |
5395 | error = rc; | |
5396 | return error; | |
5397 | } | |
5398 | ||
3e3398a0 MC |
5399 | int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
5400 | struct kstat *stat) | |
5401 | { | |
5402 | struct inode *inode; | |
5403 | unsigned long delalloc_blocks; | |
5404 | ||
5405 | inode = dentry->d_inode; | |
5406 | generic_fillattr(inode, stat); | |
5407 | ||
5408 | /* | |
5409 | * We can't update i_blocks if the block allocation is delayed | |
5410 | * otherwise in the case of system crash before the real block | |
5411 | * allocation is done, we will have i_blocks inconsistent with | |
5412 | * on-disk file blocks. | |
5413 | * We always keep i_blocks updated together with real | |
5414 | * allocation. But to not confuse with user, stat | |
5415 | * will return the blocks that include the delayed allocation | |
5416 | * blocks for this file. | |
5417 | */ | |
3e3398a0 | 5418 | delalloc_blocks = EXT4_I(inode)->i_reserved_data_blocks; |
3e3398a0 MC |
5419 | |
5420 | stat->blocks += (delalloc_blocks << inode->i_sb->s_blocksize_bits)>>9; | |
5421 | return 0; | |
5422 | } | |
ac27a0ec | 5423 | |
a02908f1 MC |
5424 | static int ext4_indirect_trans_blocks(struct inode *inode, int nrblocks, |
5425 | int chunk) | |
5426 | { | |
5427 | int indirects; | |
5428 | ||
5429 | /* if nrblocks are contiguous */ | |
5430 | if (chunk) { | |
5431 | /* | |
5432 | * With N contiguous data blocks, it need at most | |
5433 | * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) indirect blocks | |
5434 | * 2 dindirect blocks | |
5435 | * 1 tindirect block | |
5436 | */ | |
5437 | indirects = nrblocks / EXT4_ADDR_PER_BLOCK(inode->i_sb); | |
5438 | return indirects + 3; | |
5439 | } | |
5440 | /* | |
5441 | * if nrblocks are not contiguous, worse case, each block touch | |
5442 | * a indirect block, and each indirect block touch a double indirect | |
5443 | * block, plus a triple indirect block | |
5444 | */ | |
5445 | indirects = nrblocks * 2 + 1; | |
5446 | return indirects; | |
5447 | } | |
5448 | ||
5449 | static int ext4_index_trans_blocks(struct inode *inode, int nrblocks, int chunk) | |
5450 | { | |
12e9b892 | 5451 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
ac51d837 TT |
5452 | return ext4_indirect_trans_blocks(inode, nrblocks, chunk); |
5453 | return ext4_ext_index_trans_blocks(inode, nrblocks, chunk); | |
a02908f1 | 5454 | } |
ac51d837 | 5455 | |
ac27a0ec | 5456 | /* |
a02908f1 MC |
5457 | * Account for index blocks, block groups bitmaps and block group |
5458 | * descriptor blocks if modify datablocks and index blocks | |
5459 | * worse case, the indexs blocks spread over different block groups | |
ac27a0ec | 5460 | * |
a02908f1 | 5461 | * If datablocks are discontiguous, they are possible to spread over |
af901ca1 | 5462 | * different block groups too. If they are contiuguous, with flexbg, |
a02908f1 | 5463 | * they could still across block group boundary. |
ac27a0ec | 5464 | * |
a02908f1 MC |
5465 | * Also account for superblock, inode, quota and xattr blocks |
5466 | */ | |
1f109d5a | 5467 | static int ext4_meta_trans_blocks(struct inode *inode, int nrblocks, int chunk) |
a02908f1 | 5468 | { |
8df9675f TT |
5469 | ext4_group_t groups, ngroups = ext4_get_groups_count(inode->i_sb); |
5470 | int gdpblocks; | |
a02908f1 MC |
5471 | int idxblocks; |
5472 | int ret = 0; | |
5473 | ||
5474 | /* | |
5475 | * How many index blocks need to touch to modify nrblocks? | |
5476 | * The "Chunk" flag indicating whether the nrblocks is | |
5477 | * physically contiguous on disk | |
5478 | * | |
5479 | * For Direct IO and fallocate, they calls get_block to allocate | |
5480 | * one single extent at a time, so they could set the "Chunk" flag | |
5481 | */ | |
5482 | idxblocks = ext4_index_trans_blocks(inode, nrblocks, chunk); | |
5483 | ||
5484 | ret = idxblocks; | |
5485 | ||
5486 | /* | |
5487 | * Now let's see how many group bitmaps and group descriptors need | |
5488 | * to account | |
5489 | */ | |
5490 | groups = idxblocks; | |
5491 | if (chunk) | |
5492 | groups += 1; | |
5493 | else | |
5494 | groups += nrblocks; | |
5495 | ||
5496 | gdpblocks = groups; | |
8df9675f TT |
5497 | if (groups > ngroups) |
5498 | groups = ngroups; | |
a02908f1 MC |
5499 | if (groups > EXT4_SB(inode->i_sb)->s_gdb_count) |
5500 | gdpblocks = EXT4_SB(inode->i_sb)->s_gdb_count; | |
5501 | ||
5502 | /* bitmaps and block group descriptor blocks */ | |
5503 | ret += groups + gdpblocks; | |
5504 | ||
5505 | /* Blocks for super block, inode, quota and xattr blocks */ | |
5506 | ret += EXT4_META_TRANS_BLOCKS(inode->i_sb); | |
5507 | ||
5508 | return ret; | |
5509 | } | |
5510 | ||
5511 | /* | |
5512 | * Calulate the total number of credits to reserve to fit | |
f3bd1f3f MC |
5513 | * the modification of a single pages into a single transaction, |
5514 | * which may include multiple chunks of block allocations. | |
ac27a0ec | 5515 | * |
525f4ed8 | 5516 | * This could be called via ext4_write_begin() |
ac27a0ec | 5517 | * |
525f4ed8 | 5518 | * We need to consider the worse case, when |
a02908f1 | 5519 | * one new block per extent. |
ac27a0ec | 5520 | */ |
a86c6181 | 5521 | int ext4_writepage_trans_blocks(struct inode *inode) |
ac27a0ec | 5522 | { |
617ba13b | 5523 | int bpp = ext4_journal_blocks_per_page(inode); |
ac27a0ec DK |
5524 | int ret; |
5525 | ||
a02908f1 | 5526 | ret = ext4_meta_trans_blocks(inode, bpp, 0); |
a86c6181 | 5527 | |
a02908f1 | 5528 | /* Account for data blocks for journalled mode */ |
617ba13b | 5529 | if (ext4_should_journal_data(inode)) |
a02908f1 | 5530 | ret += bpp; |
ac27a0ec DK |
5531 | return ret; |
5532 | } | |
f3bd1f3f MC |
5533 | |
5534 | /* | |
5535 | * Calculate the journal credits for a chunk of data modification. | |
5536 | * | |
5537 | * This is called from DIO, fallocate or whoever calling | |
79e83036 | 5538 | * ext4_map_blocks() to map/allocate a chunk of contiguous disk blocks. |
f3bd1f3f MC |
5539 | * |
5540 | * journal buffers for data blocks are not included here, as DIO | |
5541 | * and fallocate do no need to journal data buffers. | |
5542 | */ | |
5543 | int ext4_chunk_trans_blocks(struct inode *inode, int nrblocks) | |
5544 | { | |
5545 | return ext4_meta_trans_blocks(inode, nrblocks, 1); | |
5546 | } | |
5547 | ||
ac27a0ec | 5548 | /* |
617ba13b | 5549 | * The caller must have previously called ext4_reserve_inode_write(). |
ac27a0ec DK |
5550 | * Give this, we know that the caller already has write access to iloc->bh. |
5551 | */ | |
617ba13b | 5552 | int ext4_mark_iloc_dirty(handle_t *handle, |
de9a55b8 | 5553 | struct inode *inode, struct ext4_iloc *iloc) |
ac27a0ec DK |
5554 | { |
5555 | int err = 0; | |
5556 | ||
25ec56b5 JNC |
5557 | if (test_opt(inode->i_sb, I_VERSION)) |
5558 | inode_inc_iversion(inode); | |
5559 | ||
ac27a0ec DK |
5560 | /* the do_update_inode consumes one bh->b_count */ |
5561 | get_bh(iloc->bh); | |
5562 | ||
dab291af | 5563 | /* ext4_do_update_inode() does jbd2_journal_dirty_metadata */ |
830156c7 | 5564 | err = ext4_do_update_inode(handle, inode, iloc); |
ac27a0ec DK |
5565 | put_bh(iloc->bh); |
5566 | return err; | |
5567 | } | |
5568 | ||
5569 | /* | |
5570 | * On success, We end up with an outstanding reference count against | |
5571 | * iloc->bh. This _must_ be cleaned up later. | |
5572 | */ | |
5573 | ||
5574 | int | |
617ba13b MC |
5575 | ext4_reserve_inode_write(handle_t *handle, struct inode *inode, |
5576 | struct ext4_iloc *iloc) | |
ac27a0ec | 5577 | { |
0390131b FM |
5578 | int err; |
5579 | ||
5580 | err = ext4_get_inode_loc(inode, iloc); | |
5581 | if (!err) { | |
5582 | BUFFER_TRACE(iloc->bh, "get_write_access"); | |
5583 | err = ext4_journal_get_write_access(handle, iloc->bh); | |
5584 | if (err) { | |
5585 | brelse(iloc->bh); | |
5586 | iloc->bh = NULL; | |
ac27a0ec DK |
5587 | } |
5588 | } | |
617ba13b | 5589 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
5590 | return err; |
5591 | } | |
5592 | ||
6dd4ee7c KS |
5593 | /* |
5594 | * Expand an inode by new_extra_isize bytes. | |
5595 | * Returns 0 on success or negative error number on failure. | |
5596 | */ | |
1d03ec98 AK |
5597 | static int ext4_expand_extra_isize(struct inode *inode, |
5598 | unsigned int new_extra_isize, | |
5599 | struct ext4_iloc iloc, | |
5600 | handle_t *handle) | |
6dd4ee7c KS |
5601 | { |
5602 | struct ext4_inode *raw_inode; | |
5603 | struct ext4_xattr_ibody_header *header; | |
6dd4ee7c KS |
5604 | |
5605 | if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) | |
5606 | return 0; | |
5607 | ||
5608 | raw_inode = ext4_raw_inode(&iloc); | |
5609 | ||
5610 | header = IHDR(inode, raw_inode); | |
6dd4ee7c KS |
5611 | |
5612 | /* No extended attributes present */ | |
19f5fb7a TT |
5613 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) || |
5614 | header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) { | |
6dd4ee7c KS |
5615 | memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE, 0, |
5616 | new_extra_isize); | |
5617 | EXT4_I(inode)->i_extra_isize = new_extra_isize; | |
5618 | return 0; | |
5619 | } | |
5620 | ||
5621 | /* try to expand with EAs present */ | |
5622 | return ext4_expand_extra_isize_ea(inode, new_extra_isize, | |
5623 | raw_inode, handle); | |
5624 | } | |
5625 | ||
ac27a0ec DK |
5626 | /* |
5627 | * What we do here is to mark the in-core inode as clean with respect to inode | |
5628 | * dirtiness (it may still be data-dirty). | |
5629 | * This means that the in-core inode may be reaped by prune_icache | |
5630 | * without having to perform any I/O. This is a very good thing, | |
5631 | * because *any* task may call prune_icache - even ones which | |
5632 | * have a transaction open against a different journal. | |
5633 | * | |
5634 | * Is this cheating? Not really. Sure, we haven't written the | |
5635 | * inode out, but prune_icache isn't a user-visible syncing function. | |
5636 | * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync) | |
5637 | * we start and wait on commits. | |
5638 | * | |
5639 | * Is this efficient/effective? Well, we're being nice to the system | |
5640 | * by cleaning up our inodes proactively so they can be reaped | |
5641 | * without I/O. But we are potentially leaving up to five seconds' | |
5642 | * worth of inodes floating about which prune_icache wants us to | |
5643 | * write out. One way to fix that would be to get prune_icache() | |
5644 | * to do a write_super() to free up some memory. It has the desired | |
5645 | * effect. | |
5646 | */ | |
617ba13b | 5647 | int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode) |
ac27a0ec | 5648 | { |
617ba13b | 5649 | struct ext4_iloc iloc; |
6dd4ee7c KS |
5650 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
5651 | static unsigned int mnt_count; | |
5652 | int err, ret; | |
ac27a0ec DK |
5653 | |
5654 | might_sleep(); | |
7ff9c073 | 5655 | trace_ext4_mark_inode_dirty(inode, _RET_IP_); |
617ba13b | 5656 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
0390131b FM |
5657 | if (ext4_handle_valid(handle) && |
5658 | EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize && | |
19f5fb7a | 5659 | !ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) { |
6dd4ee7c KS |
5660 | /* |
5661 | * We need extra buffer credits since we may write into EA block | |
5662 | * with this same handle. If journal_extend fails, then it will | |
5663 | * only result in a minor loss of functionality for that inode. | |
5664 | * If this is felt to be critical, then e2fsck should be run to | |
5665 | * force a large enough s_min_extra_isize. | |
5666 | */ | |
5667 | if ((jbd2_journal_extend(handle, | |
5668 | EXT4_DATA_TRANS_BLOCKS(inode->i_sb))) == 0) { | |
5669 | ret = ext4_expand_extra_isize(inode, | |
5670 | sbi->s_want_extra_isize, | |
5671 | iloc, handle); | |
5672 | if (ret) { | |
19f5fb7a TT |
5673 | ext4_set_inode_state(inode, |
5674 | EXT4_STATE_NO_EXPAND); | |
c1bddad9 AK |
5675 | if (mnt_count != |
5676 | le16_to_cpu(sbi->s_es->s_mnt_count)) { | |
12062ddd | 5677 | ext4_warning(inode->i_sb, |
6dd4ee7c KS |
5678 | "Unable to expand inode %lu. Delete" |
5679 | " some EAs or run e2fsck.", | |
5680 | inode->i_ino); | |
c1bddad9 AK |
5681 | mnt_count = |
5682 | le16_to_cpu(sbi->s_es->s_mnt_count); | |
6dd4ee7c KS |
5683 | } |
5684 | } | |
5685 | } | |
5686 | } | |
ac27a0ec | 5687 | if (!err) |
617ba13b | 5688 | err = ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
5689 | return err; |
5690 | } | |
5691 | ||
5692 | /* | |
617ba13b | 5693 | * ext4_dirty_inode() is called from __mark_inode_dirty() |
ac27a0ec DK |
5694 | * |
5695 | * We're really interested in the case where a file is being extended. | |
5696 | * i_size has been changed by generic_commit_write() and we thus need | |
5697 | * to include the updated inode in the current transaction. | |
5698 | * | |
5dd4056d | 5699 | * Also, dquot_alloc_block() will always dirty the inode when blocks |
ac27a0ec DK |
5700 | * are allocated to the file. |
5701 | * | |
5702 | * If the inode is marked synchronous, we don't honour that here - doing | |
5703 | * so would cause a commit on atime updates, which we don't bother doing. | |
5704 | * We handle synchronous inodes at the highest possible level. | |
5705 | */ | |
617ba13b | 5706 | void ext4_dirty_inode(struct inode *inode) |
ac27a0ec | 5707 | { |
ac27a0ec DK |
5708 | handle_t *handle; |
5709 | ||
617ba13b | 5710 | handle = ext4_journal_start(inode, 2); |
ac27a0ec DK |
5711 | if (IS_ERR(handle)) |
5712 | goto out; | |
f3dc272f | 5713 | |
f3dc272f CW |
5714 | ext4_mark_inode_dirty(handle, inode); |
5715 | ||
617ba13b | 5716 | ext4_journal_stop(handle); |
ac27a0ec DK |
5717 | out: |
5718 | return; | |
5719 | } | |
5720 | ||
5721 | #if 0 | |
5722 | /* | |
5723 | * Bind an inode's backing buffer_head into this transaction, to prevent | |
5724 | * it from being flushed to disk early. Unlike | |
617ba13b | 5725 | * ext4_reserve_inode_write, this leaves behind no bh reference and |
ac27a0ec DK |
5726 | * returns no iloc structure, so the caller needs to repeat the iloc |
5727 | * lookup to mark the inode dirty later. | |
5728 | */ | |
617ba13b | 5729 | static int ext4_pin_inode(handle_t *handle, struct inode *inode) |
ac27a0ec | 5730 | { |
617ba13b | 5731 | struct ext4_iloc iloc; |
ac27a0ec DK |
5732 | |
5733 | int err = 0; | |
5734 | if (handle) { | |
617ba13b | 5735 | err = ext4_get_inode_loc(inode, &iloc); |
ac27a0ec DK |
5736 | if (!err) { |
5737 | BUFFER_TRACE(iloc.bh, "get_write_access"); | |
dab291af | 5738 | err = jbd2_journal_get_write_access(handle, iloc.bh); |
ac27a0ec | 5739 | if (!err) |
0390131b | 5740 | err = ext4_handle_dirty_metadata(handle, |
73b50c1c | 5741 | NULL, |
0390131b | 5742 | iloc.bh); |
ac27a0ec DK |
5743 | brelse(iloc.bh); |
5744 | } | |
5745 | } | |
617ba13b | 5746 | ext4_std_error(inode->i_sb, err); |
ac27a0ec DK |
5747 | return err; |
5748 | } | |
5749 | #endif | |
5750 | ||
617ba13b | 5751 | int ext4_change_inode_journal_flag(struct inode *inode, int val) |
ac27a0ec DK |
5752 | { |
5753 | journal_t *journal; | |
5754 | handle_t *handle; | |
5755 | int err; | |
5756 | ||
5757 | /* | |
5758 | * We have to be very careful here: changing a data block's | |
5759 | * journaling status dynamically is dangerous. If we write a | |
5760 | * data block to the journal, change the status and then delete | |
5761 | * that block, we risk forgetting to revoke the old log record | |
5762 | * from the journal and so a subsequent replay can corrupt data. | |
5763 | * So, first we make sure that the journal is empty and that | |
5764 | * nobody is changing anything. | |
5765 | */ | |
5766 | ||
617ba13b | 5767 | journal = EXT4_JOURNAL(inode); |
0390131b FM |
5768 | if (!journal) |
5769 | return 0; | |
d699594d | 5770 | if (is_journal_aborted(journal)) |
ac27a0ec DK |
5771 | return -EROFS; |
5772 | ||
dab291af MC |
5773 | jbd2_journal_lock_updates(journal); |
5774 | jbd2_journal_flush(journal); | |
ac27a0ec DK |
5775 | |
5776 | /* | |
5777 | * OK, there are no updates running now, and all cached data is | |
5778 | * synced to disk. We are now in a completely consistent state | |
5779 | * which doesn't have anything in the journal, and we know that | |
5780 | * no filesystem updates are running, so it is safe to modify | |
5781 | * the inode's in-core data-journaling state flag now. | |
5782 | */ | |
5783 | ||
5784 | if (val) | |
12e9b892 | 5785 | ext4_set_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); |
ac27a0ec | 5786 | else |
12e9b892 | 5787 | ext4_clear_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); |
617ba13b | 5788 | ext4_set_aops(inode); |
ac27a0ec | 5789 | |
dab291af | 5790 | jbd2_journal_unlock_updates(journal); |
ac27a0ec DK |
5791 | |
5792 | /* Finally we can mark the inode as dirty. */ | |
5793 | ||
617ba13b | 5794 | handle = ext4_journal_start(inode, 1); |
ac27a0ec DK |
5795 | if (IS_ERR(handle)) |
5796 | return PTR_ERR(handle); | |
5797 | ||
617ba13b | 5798 | err = ext4_mark_inode_dirty(handle, inode); |
0390131b | 5799 | ext4_handle_sync(handle); |
617ba13b MC |
5800 | ext4_journal_stop(handle); |
5801 | ext4_std_error(inode->i_sb, err); | |
ac27a0ec DK |
5802 | |
5803 | return err; | |
5804 | } | |
2e9ee850 AK |
5805 | |
5806 | static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh) | |
5807 | { | |
5808 | return !buffer_mapped(bh); | |
5809 | } | |
5810 | ||
c2ec175c | 5811 | int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
2e9ee850 | 5812 | { |
c2ec175c | 5813 | struct page *page = vmf->page; |
2e9ee850 AK |
5814 | loff_t size; |
5815 | unsigned long len; | |
5816 | int ret = -EINVAL; | |
79f0be8d | 5817 | void *fsdata; |
2e9ee850 AK |
5818 | struct file *file = vma->vm_file; |
5819 | struct inode *inode = file->f_path.dentry->d_inode; | |
5820 | struct address_space *mapping = inode->i_mapping; | |
5821 | ||
5822 | /* | |
5823 | * Get i_alloc_sem to stop truncates messing with the inode. We cannot | |
5824 | * get i_mutex because we are already holding mmap_sem. | |
5825 | */ | |
5826 | down_read(&inode->i_alloc_sem); | |
5827 | size = i_size_read(inode); | |
5828 | if (page->mapping != mapping || size <= page_offset(page) | |
5829 | || !PageUptodate(page)) { | |
5830 | /* page got truncated from under us? */ | |
5831 | goto out_unlock; | |
5832 | } | |
5833 | ret = 0; | |
5834 | if (PageMappedToDisk(page)) | |
5835 | goto out_unlock; | |
5836 | ||
5837 | if (page->index == size >> PAGE_CACHE_SHIFT) | |
5838 | len = size & ~PAGE_CACHE_MASK; | |
5839 | else | |
5840 | len = PAGE_CACHE_SIZE; | |
5841 | ||
a827eaff AK |
5842 | lock_page(page); |
5843 | /* | |
5844 | * return if we have all the buffers mapped. This avoid | |
5845 | * the need to call write_begin/write_end which does a | |
5846 | * journal_start/journal_stop which can block and take | |
5847 | * long time | |
5848 | */ | |
2e9ee850 | 5849 | if (page_has_buffers(page)) { |
2e9ee850 | 5850 | if (!walk_page_buffers(NULL, page_buffers(page), 0, len, NULL, |
a827eaff AK |
5851 | ext4_bh_unmapped)) { |
5852 | unlock_page(page); | |
2e9ee850 | 5853 | goto out_unlock; |
a827eaff | 5854 | } |
2e9ee850 | 5855 | } |
a827eaff | 5856 | unlock_page(page); |
2e9ee850 AK |
5857 | /* |
5858 | * OK, we need to fill the hole... Do write_begin write_end | |
5859 | * to do block allocation/reservation.We are not holding | |
5860 | * inode.i__mutex here. That allow * parallel write_begin, | |
5861 | * write_end call. lock_page prevent this from happening | |
5862 | * on the same page though | |
5863 | */ | |
5864 | ret = mapping->a_ops->write_begin(file, mapping, page_offset(page), | |
79f0be8d | 5865 | len, AOP_FLAG_UNINTERRUPTIBLE, &page, &fsdata); |
2e9ee850 AK |
5866 | if (ret < 0) |
5867 | goto out_unlock; | |
5868 | ret = mapping->a_ops->write_end(file, mapping, page_offset(page), | |
79f0be8d | 5869 | len, len, page, fsdata); |
2e9ee850 AK |
5870 | if (ret < 0) |
5871 | goto out_unlock; | |
5872 | ret = 0; | |
5873 | out_unlock: | |
c2ec175c NP |
5874 | if (ret) |
5875 | ret = VM_FAULT_SIGBUS; | |
2e9ee850 AK |
5876 | up_read(&inode->i_alloc_sem); |
5877 | return ret; | |
5878 | } |