Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/resize.c |
ac27a0ec | 3 | * |
617ba13b | 4 | * Support for resizing an ext4 filesystem while it is mounted. |
ac27a0ec DK |
5 | * |
6 | * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> | |
7 | * | |
8 | * This could probably be made into a module, because it is not often in use. | |
9 | */ | |
10 | ||
11 | ||
617ba13b | 12 | #define EXT4FS_DEBUG |
ac27a0ec | 13 | |
ac27a0ec DK |
14 | #include <linux/errno.h> |
15 | #include <linux/slab.h> | |
16 | ||
3dcf5451 | 17 | #include "ext4_jbd2.h" |
ac27a0ec | 18 | |
8f82f840 YY |
19 | int ext4_resize_begin(struct super_block *sb) |
20 | { | |
21 | int ret = 0; | |
22 | ||
23 | if (!capable(CAP_SYS_RESOURCE)) | |
24 | return -EPERM; | |
25 | ||
ce723c31 YY |
26 | /* |
27 | * We are not allowed to do online-resizing on a filesystem mounted | |
28 | * with error, because it can destroy the filesystem easily. | |
29 | */ | |
30 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { | |
31 | ext4_warning(sb, "There are errors in the filesystem, " | |
32 | "so online resizing is not allowed\n"); | |
33 | return -EPERM; | |
34 | } | |
35 | ||
8f82f840 YY |
36 | if (test_and_set_bit_lock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags)) |
37 | ret = -EBUSY; | |
38 | ||
39 | return ret; | |
40 | } | |
41 | ||
42 | void ext4_resize_end(struct super_block *sb) | |
43 | { | |
44 | clear_bit_unlock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags); | |
45 | smp_mb__after_clear_bit(); | |
46 | } | |
47 | ||
ac27a0ec DK |
48 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
49 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) | |
50 | ||
51 | static int verify_group_input(struct super_block *sb, | |
617ba13b | 52 | struct ext4_new_group_data *input) |
ac27a0ec | 53 | { |
617ba13b MC |
54 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
55 | struct ext4_super_block *es = sbi->s_es; | |
bd81d8ee | 56 | ext4_fsblk_t start = ext4_blocks_count(es); |
617ba13b | 57 | ext4_fsblk_t end = start + input->blocks_count; |
fd2d4291 | 58 | ext4_group_t group = input->group; |
617ba13b MC |
59 | ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
60 | unsigned overhead = ext4_bg_has_super(sb, group) ? | |
61 | (1 + ext4_bg_num_gdb(sb, group) + | |
ac27a0ec | 62 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; |
617ba13b | 63 | ext4_fsblk_t metaend = start + overhead; |
ac27a0ec | 64 | struct buffer_head *bh = NULL; |
3a5b2ecd | 65 | ext4_grpblk_t free_blocks_count, offset; |
ac27a0ec DK |
66 | int err = -EINVAL; |
67 | ||
68 | input->free_blocks_count = free_blocks_count = | |
69 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; | |
70 | ||
71 | if (test_opt(sb, DEBUG)) | |
617ba13b | 72 | printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " |
ac27a0ec | 73 | "(%d free, %u reserved)\n", |
617ba13b | 74 | ext4_bg_has_super(sb, input->group) ? "normal" : |
ac27a0ec DK |
75 | "no-super", input->group, input->blocks_count, |
76 | free_blocks_count, input->reserved_blocks); | |
77 | ||
3a5b2ecd | 78 | ext4_get_group_no_and_offset(sb, start, NULL, &offset); |
ac27a0ec | 79 | if (group != sbi->s_groups_count) |
12062ddd | 80 | ext4_warning(sb, "Cannot add at group %u (only %u groups)", |
ac27a0ec | 81 | input->group, sbi->s_groups_count); |
3a5b2ecd | 82 | else if (offset != 0) |
12062ddd | 83 | ext4_warning(sb, "Last group not full"); |
ac27a0ec | 84 | else if (input->reserved_blocks > input->blocks_count / 5) |
12062ddd | 85 | ext4_warning(sb, "Reserved blocks too high (%u)", |
ac27a0ec DK |
86 | input->reserved_blocks); |
87 | else if (free_blocks_count < 0) | |
12062ddd | 88 | ext4_warning(sb, "Bad blocks count %u", |
ac27a0ec DK |
89 | input->blocks_count); |
90 | else if (!(bh = sb_bread(sb, end - 1))) | |
12062ddd | 91 | ext4_warning(sb, "Cannot read last block (%llu)", |
ac27a0ec DK |
92 | end - 1); |
93 | else if (outside(input->block_bitmap, start, end)) | |
12062ddd | 94 | ext4_warning(sb, "Block bitmap not in group (block %llu)", |
1939e49a | 95 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 96 | else if (outside(input->inode_bitmap, start, end)) |
12062ddd | 97 | ext4_warning(sb, "Inode bitmap not in group (block %llu)", |
1939e49a | 98 | (unsigned long long)input->inode_bitmap); |
ac27a0ec | 99 | else if (outside(input->inode_table, start, end) || |
2b2d6d01 | 100 | outside(itend - 1, start, end)) |
12062ddd | 101 | ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", |
1939e49a | 102 | (unsigned long long)input->inode_table, itend - 1); |
ac27a0ec | 103 | else if (input->inode_bitmap == input->block_bitmap) |
12062ddd | 104 | ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", |
1939e49a | 105 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 106 | else if (inside(input->block_bitmap, input->inode_table, itend)) |
12062ddd ES |
107 | ext4_warning(sb, "Block bitmap (%llu) in inode table " |
108 | "(%llu-%llu)", | |
1939e49a RD |
109 | (unsigned long long)input->block_bitmap, |
110 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 111 | else if (inside(input->inode_bitmap, input->inode_table, itend)) |
12062ddd ES |
112 | ext4_warning(sb, "Inode bitmap (%llu) in inode table " |
113 | "(%llu-%llu)", | |
1939e49a RD |
114 | (unsigned long long)input->inode_bitmap, |
115 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 116 | else if (inside(input->block_bitmap, start, metaend)) |
12062ddd | 117 | ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
118 | (unsigned long long)input->block_bitmap, |
119 | start, metaend - 1); | |
ac27a0ec | 120 | else if (inside(input->inode_bitmap, start, metaend)) |
12062ddd | 121 | ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
122 | (unsigned long long)input->inode_bitmap, |
123 | start, metaend - 1); | |
ac27a0ec | 124 | else if (inside(input->inode_table, start, metaend) || |
2b2d6d01 | 125 | inside(itend - 1, start, metaend)) |
12062ddd ES |
126 | ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " |
127 | "(%llu-%llu)", | |
1939e49a RD |
128 | (unsigned long long)input->inode_table, |
129 | itend - 1, start, metaend - 1); | |
ac27a0ec DK |
130 | else |
131 | err = 0; | |
132 | brelse(bh); | |
133 | ||
134 | return err; | |
135 | } | |
136 | ||
28c7bac0 YY |
137 | /* |
138 | * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex | |
139 | * group each time. | |
140 | */ | |
141 | struct ext4_new_flex_group_data { | |
142 | struct ext4_new_group_data *groups; /* new_group_data for groups | |
143 | in the flex group */ | |
144 | __u16 *bg_flags; /* block group flags of groups | |
145 | in @groups */ | |
146 | ext4_group_t count; /* number of groups in @groups | |
147 | */ | |
148 | }; | |
149 | ||
150 | /* | |
151 | * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of | |
152 | * @flexbg_size. | |
153 | * | |
154 | * Returns NULL on failure otherwise address of the allocated structure. | |
155 | */ | |
156 | static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) | |
157 | { | |
158 | struct ext4_new_flex_group_data *flex_gd; | |
159 | ||
160 | flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); | |
161 | if (flex_gd == NULL) | |
162 | goto out3; | |
163 | ||
164 | flex_gd->count = flexbg_size; | |
165 | ||
166 | flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) * | |
167 | flexbg_size, GFP_NOFS); | |
168 | if (flex_gd->groups == NULL) | |
169 | goto out2; | |
170 | ||
171 | flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS); | |
172 | if (flex_gd->bg_flags == NULL) | |
173 | goto out1; | |
174 | ||
175 | return flex_gd; | |
176 | ||
177 | out1: | |
178 | kfree(flex_gd->groups); | |
179 | out2: | |
180 | kfree(flex_gd); | |
181 | out3: | |
182 | return NULL; | |
183 | } | |
184 | ||
185 | static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) | |
186 | { | |
187 | kfree(flex_gd->bg_flags); | |
188 | kfree(flex_gd->groups); | |
189 | kfree(flex_gd); | |
190 | } | |
191 | ||
3fbea4b3 YY |
192 | /* |
193 | * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps | |
194 | * and inode tables for a flex group. | |
195 | * | |
196 | * This function is used by 64bit-resize. Note that this function allocates | |
197 | * group tables from the 1st group of groups contained by @flexgd, which may | |
198 | * be a partial of a flex group. | |
199 | * | |
200 | * @sb: super block of fs to which the groups belongs | |
201 | */ | |
202 | static void ext4_alloc_group_tables(struct super_block *sb, | |
203 | struct ext4_new_flex_group_data *flex_gd, | |
204 | int flexbg_size) | |
205 | { | |
206 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
207 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
208 | ext4_fsblk_t start_blk; | |
209 | ext4_fsblk_t last_blk; | |
210 | ext4_group_t src_group; | |
211 | ext4_group_t bb_index = 0; | |
212 | ext4_group_t ib_index = 0; | |
213 | ext4_group_t it_index = 0; | |
214 | ext4_group_t group; | |
215 | ext4_group_t last_group; | |
216 | unsigned overhead; | |
217 | ||
218 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
219 | ||
220 | src_group = group_data[0].group; | |
221 | last_group = src_group + flex_gd->count - 1; | |
222 | ||
223 | BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != | |
224 | (last_group & ~(flexbg_size - 1)))); | |
225 | next_group: | |
226 | group = group_data[0].group; | |
227 | start_blk = ext4_group_first_block_no(sb, src_group); | |
228 | last_blk = start_blk + group_data[src_group - group].blocks_count; | |
229 | ||
230 | overhead = ext4_bg_has_super(sb, src_group) ? | |
231 | (1 + ext4_bg_num_gdb(sb, src_group) + | |
232 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; | |
233 | ||
234 | start_blk += overhead; | |
235 | ||
236 | BUG_ON(src_group >= group_data[0].group + flex_gd->count); | |
237 | /* We collect contiguous blocks as much as possible. */ | |
238 | src_group++; | |
239 | for (; src_group <= last_group; src_group++) | |
240 | if (!ext4_bg_has_super(sb, src_group)) | |
241 | last_blk += group_data[src_group - group].blocks_count; | |
242 | else | |
243 | break; | |
244 | ||
245 | /* Allocate block bitmaps */ | |
246 | for (; bb_index < flex_gd->count; bb_index++) { | |
247 | if (start_blk >= last_blk) | |
248 | goto next_group; | |
249 | group_data[bb_index].block_bitmap = start_blk++; | |
250 | ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); | |
251 | group -= group_data[0].group; | |
252 | group_data[group].free_blocks_count--; | |
253 | if (flexbg_size > 1) | |
254 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
255 | } | |
256 | ||
257 | /* Allocate inode bitmaps */ | |
258 | for (; ib_index < flex_gd->count; ib_index++) { | |
259 | if (start_blk >= last_blk) | |
260 | goto next_group; | |
261 | group_data[ib_index].inode_bitmap = start_blk++; | |
262 | ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); | |
263 | group -= group_data[0].group; | |
264 | group_data[group].free_blocks_count--; | |
265 | if (flexbg_size > 1) | |
266 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
267 | } | |
268 | ||
269 | /* Allocate inode tables */ | |
270 | for (; it_index < flex_gd->count; it_index++) { | |
271 | if (start_blk + EXT4_SB(sb)->s_itb_per_group > last_blk) | |
272 | goto next_group; | |
273 | group_data[it_index].inode_table = start_blk; | |
274 | ext4_get_group_no_and_offset(sb, start_blk, &group, NULL); | |
275 | group -= group_data[0].group; | |
276 | group_data[group].free_blocks_count -= | |
277 | EXT4_SB(sb)->s_itb_per_group; | |
278 | if (flexbg_size > 1) | |
279 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
280 | ||
281 | start_blk += EXT4_SB(sb)->s_itb_per_group; | |
282 | } | |
283 | ||
284 | if (test_opt(sb, DEBUG)) { | |
285 | int i; | |
286 | group = group_data[0].group; | |
287 | ||
288 | printk(KERN_DEBUG "EXT4-fs: adding a flex group with " | |
289 | "%d groups, flexbg size is %d:\n", flex_gd->count, | |
290 | flexbg_size); | |
291 | ||
292 | for (i = 0; i < flex_gd->count; i++) { | |
293 | printk(KERN_DEBUG "adding %s group %u: %u " | |
294 | "blocks (%d free)\n", | |
295 | ext4_bg_has_super(sb, group + i) ? "normal" : | |
296 | "no-super", group + i, | |
297 | group_data[i].blocks_count, | |
298 | group_data[i].free_blocks_count); | |
299 | } | |
300 | } | |
301 | } | |
302 | ||
ac27a0ec | 303 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
617ba13b | 304 | ext4_fsblk_t blk) |
ac27a0ec DK |
305 | { |
306 | struct buffer_head *bh; | |
307 | int err; | |
308 | ||
309 | bh = sb_getblk(sb, blk); | |
310 | if (!bh) | |
311 | return ERR_PTR(-EIO); | |
617ba13b | 312 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
ac27a0ec DK |
313 | brelse(bh); |
314 | bh = ERR_PTR(err); | |
315 | } else { | |
ac27a0ec DK |
316 | memset(bh->b_data, 0, sb->s_blocksize); |
317 | set_buffer_uptodate(bh); | |
ac27a0ec DK |
318 | } |
319 | ||
320 | return bh; | |
321 | } | |
322 | ||
14904107 ES |
323 | /* |
324 | * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. | |
325 | * If that fails, restart the transaction & regain write access for the | |
326 | * buffer head which is used for block_bitmap modifications. | |
327 | */ | |
6d40bc5a | 328 | static int extend_or_restart_transaction(handle_t *handle, int thresh) |
14904107 ES |
329 | { |
330 | int err; | |
331 | ||
0390131b | 332 | if (ext4_handle_has_enough_credits(handle, thresh)) |
14904107 ES |
333 | return 0; |
334 | ||
335 | err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); | |
336 | if (err < 0) | |
337 | return err; | |
338 | if (err) { | |
6d40bc5a YY |
339 | err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
340 | if (err) | |
14904107 | 341 | return err; |
2b2d6d01 | 342 | } |
14904107 ES |
343 | |
344 | return 0; | |
345 | } | |
346 | ||
33afdcc5 YY |
347 | /* |
348 | * set_flexbg_block_bitmap() mark @count blocks starting from @block used. | |
349 | * | |
350 | * Helper function for ext4_setup_new_group_blocks() which set . | |
351 | * | |
352 | * @sb: super block | |
353 | * @handle: journal handle | |
354 | * @flex_gd: flex group data | |
355 | */ | |
356 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, | |
357 | struct ext4_new_flex_group_data *flex_gd, | |
358 | ext4_fsblk_t block, ext4_group_t count) | |
359 | { | |
360 | ext4_group_t count2; | |
361 | ||
362 | ext4_debug("mark blocks [%llu/%u] used\n", block, count); | |
363 | for (count2 = count; count > 0; count -= count2, block += count2) { | |
364 | ext4_fsblk_t start; | |
365 | struct buffer_head *bh; | |
366 | ext4_group_t group; | |
367 | int err; | |
368 | ||
369 | ext4_get_group_no_and_offset(sb, block, &group, NULL); | |
370 | start = ext4_group_first_block_no(sb, group); | |
371 | group -= flex_gd->groups[0].group; | |
372 | ||
373 | count2 = sb->s_blocksize * 8 - (block - start); | |
374 | if (count2 > count) | |
375 | count2 = count; | |
376 | ||
377 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { | |
378 | BUG_ON(flex_gd->count > 1); | |
379 | continue; | |
380 | } | |
381 | ||
382 | err = extend_or_restart_transaction(handle, 1); | |
383 | if (err) | |
384 | return err; | |
385 | ||
386 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); | |
387 | if (!bh) | |
388 | return -EIO; | |
389 | ||
390 | err = ext4_journal_get_write_access(handle, bh); | |
391 | if (err) | |
392 | return err; | |
393 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block, | |
394 | block - start, count2); | |
395 | ext4_set_bits(bh->b_data, block - start, count2); | |
396 | ||
397 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
398 | if (unlikely(err)) | |
399 | return err; | |
400 | brelse(bh); | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | /* | |
407 | * Set up the block and inode bitmaps, and the inode table for the new groups. | |
408 | * This doesn't need to be part of the main transaction, since we are only | |
409 | * changing blocks outside the actual filesystem. We still do journaling to | |
410 | * ensure the recovery is correct in case of a failure just after resize. | |
411 | * If any part of this fails, we simply abort the resize. | |
412 | * | |
413 | * setup_new_flex_group_blocks handles a flex group as follow: | |
414 | * 1. copy super block and GDT, and initialize group tables if necessary. | |
415 | * In this step, we only set bits in blocks bitmaps for blocks taken by | |
416 | * super block and GDT. | |
417 | * 2. allocate group tables in block bitmaps, that is, set bits in block | |
418 | * bitmap for blocks taken by group tables. | |
419 | */ | |
420 | static int setup_new_flex_group_blocks(struct super_block *sb, | |
421 | struct ext4_new_flex_group_data *flex_gd) | |
422 | { | |
423 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; | |
424 | ext4_fsblk_t start; | |
425 | ext4_fsblk_t block; | |
426 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
427 | struct ext4_super_block *es = sbi->s_es; | |
428 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
429 | __u16 *bg_flags = flex_gd->bg_flags; | |
430 | handle_t *handle; | |
431 | ext4_group_t group, count; | |
432 | struct buffer_head *bh = NULL; | |
433 | int reserved_gdb, i, j, err = 0, err2; | |
434 | ||
435 | BUG_ON(!flex_gd->count || !group_data || | |
436 | group_data[0].group != sbi->s_groups_count); | |
437 | ||
438 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
439 | ||
440 | /* This transaction may be extended/restarted along the way */ | |
441 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); | |
442 | if (IS_ERR(handle)) | |
443 | return PTR_ERR(handle); | |
444 | ||
445 | group = group_data[0].group; | |
446 | for (i = 0; i < flex_gd->count; i++, group++) { | |
447 | unsigned long gdblocks; | |
448 | ||
449 | gdblocks = ext4_bg_num_gdb(sb, group); | |
450 | start = ext4_group_first_block_no(sb, group); | |
451 | ||
452 | /* Copy all of the GDT blocks into the backup in this group */ | |
453 | for (j = 0, block = start + 1; j < gdblocks; j++, block++) { | |
454 | struct buffer_head *gdb; | |
455 | ||
456 | ext4_debug("update backup group %#04llx\n", block); | |
457 | err = extend_or_restart_transaction(handle, 1); | |
458 | if (err) | |
459 | goto out; | |
460 | ||
461 | gdb = sb_getblk(sb, block); | |
462 | if (!gdb) { | |
463 | err = -EIO; | |
464 | goto out; | |
465 | } | |
466 | ||
467 | err = ext4_journal_get_write_access(handle, gdb); | |
468 | if (err) { | |
469 | brelse(gdb); | |
470 | goto out; | |
471 | } | |
472 | memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, | |
473 | gdb->b_size); | |
474 | set_buffer_uptodate(gdb); | |
475 | ||
476 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); | |
477 | if (unlikely(err)) { | |
478 | brelse(gdb); | |
479 | goto out; | |
480 | } | |
481 | brelse(gdb); | |
482 | } | |
483 | ||
484 | /* Zero out all of the reserved backup group descriptor | |
485 | * table blocks | |
486 | */ | |
487 | if (ext4_bg_has_super(sb, group)) { | |
488 | err = sb_issue_zeroout(sb, gdblocks + start + 1, | |
489 | reserved_gdb, GFP_NOFS); | |
490 | if (err) | |
491 | goto out; | |
492 | } | |
493 | ||
494 | /* Initialize group tables of the grop @group */ | |
495 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) | |
496 | goto handle_bb; | |
497 | ||
498 | /* Zero out all of the inode table blocks */ | |
499 | block = group_data[i].inode_table; | |
500 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", | |
501 | block, sbi->s_itb_per_group); | |
502 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, | |
503 | GFP_NOFS); | |
504 | if (err) | |
505 | goto out; | |
506 | ||
507 | handle_bb: | |
508 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) | |
509 | goto handle_ib; | |
510 | ||
511 | /* Initialize block bitmap of the @group */ | |
512 | block = group_data[i].block_bitmap; | |
513 | err = extend_or_restart_transaction(handle, 1); | |
514 | if (err) | |
515 | goto out; | |
516 | ||
517 | bh = bclean(handle, sb, block); | |
518 | if (IS_ERR(bh)) { | |
519 | err = PTR_ERR(bh); | |
520 | goto out; | |
521 | } | |
522 | if (ext4_bg_has_super(sb, group)) { | |
523 | ext4_debug("mark backup superblock %#04llx (+0)\n", | |
524 | start); | |
525 | ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb + | |
526 | 1); | |
527 | } | |
528 | ext4_mark_bitmap_end(group_data[i].blocks_count, | |
529 | sb->s_blocksize * 8, bh->b_data); | |
530 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
531 | if (err) | |
532 | goto out; | |
533 | brelse(bh); | |
534 | ||
535 | handle_ib: | |
536 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) | |
537 | continue; | |
538 | ||
539 | /* Initialize inode bitmap of the @group */ | |
540 | block = group_data[i].inode_bitmap; | |
541 | err = extend_or_restart_transaction(handle, 1); | |
542 | if (err) | |
543 | goto out; | |
544 | /* Mark unused entries in inode bitmap used */ | |
545 | bh = bclean(handle, sb, block); | |
546 | if (IS_ERR(bh)) { | |
547 | err = PTR_ERR(bh); | |
548 | goto out; | |
549 | } | |
550 | ||
551 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
552 | sb->s_blocksize * 8, bh->b_data); | |
553 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
554 | if (err) | |
555 | goto out; | |
556 | brelse(bh); | |
557 | } | |
558 | bh = NULL; | |
559 | ||
560 | /* Mark group tables in block bitmap */ | |
561 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { | |
562 | count = group_table_count[j]; | |
563 | start = (&group_data[0].block_bitmap)[j]; | |
564 | block = start; | |
565 | for (i = 1; i < flex_gd->count; i++) { | |
566 | block += group_table_count[j]; | |
567 | if (block == (&group_data[i].block_bitmap)[j]) { | |
568 | count += group_table_count[j]; | |
569 | continue; | |
570 | } | |
571 | err = set_flexbg_block_bitmap(sb, handle, | |
572 | flex_gd, start, count); | |
573 | if (err) | |
574 | goto out; | |
575 | count = group_table_count[j]; | |
576 | start = group_data[i].block_bitmap; | |
577 | block = start; | |
578 | } | |
579 | ||
580 | if (count) { | |
581 | err = set_flexbg_block_bitmap(sb, handle, | |
582 | flex_gd, start, count); | |
583 | if (err) | |
584 | goto out; | |
585 | } | |
586 | } | |
587 | ||
588 | out: | |
589 | brelse(bh); | |
590 | err2 = ext4_journal_stop(handle); | |
591 | if (err2 && !err) | |
592 | err = err2; | |
593 | ||
594 | return err; | |
595 | } | |
596 | ||
ac27a0ec DK |
597 | /* |
598 | * Set up the block and inode bitmaps, and the inode table for the new group. | |
599 | * This doesn't need to be part of the main transaction, since we are only | |
600 | * changing blocks outside the actual filesystem. We still do journaling to | |
601 | * ensure the recovery is correct in case of a failure just after resize. | |
602 | * If any part of this fails, we simply abort the resize. | |
603 | */ | |
604 | static int setup_new_group_blocks(struct super_block *sb, | |
617ba13b | 605 | struct ext4_new_group_data *input) |
ac27a0ec | 606 | { |
617ba13b MC |
607 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
608 | ext4_fsblk_t start = ext4_group_first_block_no(sb, input->group); | |
609 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec | 610 | le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0; |
617ba13b | 611 | unsigned long gdblocks = ext4_bg_num_gdb(sb, input->group); |
ac27a0ec DK |
612 | struct buffer_head *bh; |
613 | handle_t *handle; | |
617ba13b MC |
614 | ext4_fsblk_t block; |
615 | ext4_grpblk_t bit; | |
ac27a0ec DK |
616 | int i; |
617 | int err = 0, err2; | |
618 | ||
14904107 ES |
619 | /* This transaction may be extended/restarted along the way */ |
620 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); | |
621 | ||
ac27a0ec DK |
622 | if (IS_ERR(handle)) |
623 | return PTR_ERR(handle); | |
624 | ||
8f82f840 | 625 | BUG_ON(input->group != sbi->s_groups_count); |
ac27a0ec | 626 | |
ac27a0ec DK |
627 | /* Copy all of the GDT blocks into the backup in this group */ |
628 | for (i = 0, bit = 1, block = start + 1; | |
629 | i < gdblocks; i++, block++, bit++) { | |
630 | struct buffer_head *gdb; | |
631 | ||
c549a95d | 632 | ext4_debug("update backup group %#04llx (+%d)\n", block, bit); |
6d40bc5a YY |
633 | err = extend_or_restart_transaction(handle, 1); |
634 | if (err) | |
635 | goto exit_journal; | |
14904107 | 636 | |
ac27a0ec DK |
637 | gdb = sb_getblk(sb, block); |
638 | if (!gdb) { | |
639 | err = -EIO; | |
6d40bc5a | 640 | goto exit_journal; |
ac27a0ec | 641 | } |
617ba13b | 642 | if ((err = ext4_journal_get_write_access(handle, gdb))) { |
ac27a0ec | 643 | brelse(gdb); |
6d40bc5a | 644 | goto exit_journal; |
ac27a0ec | 645 | } |
5b615287 | 646 | memcpy(gdb->b_data, sbi->s_group_desc[i]->b_data, gdb->b_size); |
ac27a0ec | 647 | set_buffer_uptodate(gdb); |
b4097142 TT |
648 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); |
649 | if (unlikely(err)) { | |
650 | brelse(gdb); | |
6d40bc5a | 651 | goto exit_journal; |
b4097142 | 652 | } |
ac27a0ec DK |
653 | brelse(gdb); |
654 | } | |
655 | ||
656 | /* Zero out all of the reserved backup group descriptor table blocks */ | |
da488945 | 657 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", |
a31437b8 LC |
658 | block, sbi->s_itb_per_group); |
659 | err = sb_issue_zeroout(sb, gdblocks + start + 1, reserved_gdb, | |
a107e5a3 | 660 | GFP_NOFS); |
a31437b8 | 661 | if (err) |
6d40bc5a YY |
662 | goto exit_journal; |
663 | ||
664 | err = extend_or_restart_transaction(handle, 2); | |
665 | if (err) | |
666 | goto exit_journal; | |
667 | ||
668 | bh = bclean(handle, sb, input->block_bitmap); | |
669 | if (IS_ERR(bh)) { | |
670 | err = PTR_ERR(bh); | |
671 | goto exit_journal; | |
672 | } | |
c3e94d1d YY |
673 | |
674 | if (ext4_bg_has_super(sb, input->group)) { | |
675 | ext4_debug("mark backup group tables %#04llx (+0)\n", start); | |
676 | ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb + 1); | |
677 | } | |
14904107 | 678 | |
c549a95d | 679 | ext4_debug("mark block bitmap %#04llx (+%llu)\n", input->block_bitmap, |
ac27a0ec | 680 | input->block_bitmap - start); |
617ba13b | 681 | ext4_set_bit(input->block_bitmap - start, bh->b_data); |
c549a95d | 682 | ext4_debug("mark inode bitmap %#04llx (+%llu)\n", input->inode_bitmap, |
ac27a0ec | 683 | input->inode_bitmap - start); |
617ba13b | 684 | ext4_set_bit(input->inode_bitmap - start, bh->b_data); |
ac27a0ec DK |
685 | |
686 | /* Zero out all of the inode table blocks */ | |
a31437b8 | 687 | block = input->inode_table; |
da488945 | 688 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", |
a31437b8 | 689 | block, sbi->s_itb_per_group); |
a107e5a3 | 690 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, GFP_NOFS); |
a31437b8 LC |
691 | if (err) |
692 | goto exit_bh; | |
c3e94d1d YY |
693 | ext4_set_bits(bh->b_data, input->inode_table - start, |
694 | sbi->s_itb_per_group); | |
14904107 | 695 | |
14904107 | 696 | |
61d08673 TT |
697 | ext4_mark_bitmap_end(input->blocks_count, sb->s_blocksize * 8, |
698 | bh->b_data); | |
b4097142 TT |
699 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
700 | if (unlikely(err)) { | |
701 | ext4_std_error(sb, err); | |
702 | goto exit_bh; | |
703 | } | |
ac27a0ec | 704 | brelse(bh); |
ac27a0ec | 705 | /* Mark unused entries in inode bitmap used */ |
c549a95d | 706 | ext4_debug("clear inode bitmap %#04llx (+%llu)\n", |
ac27a0ec DK |
707 | input->inode_bitmap, input->inode_bitmap - start); |
708 | if (IS_ERR(bh = bclean(handle, sb, input->inode_bitmap))) { | |
709 | err = PTR_ERR(bh); | |
710 | goto exit_journal; | |
711 | } | |
712 | ||
61d08673 TT |
713 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), sb->s_blocksize * 8, |
714 | bh->b_data); | |
b4097142 TT |
715 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
716 | if (unlikely(err)) | |
717 | ext4_std_error(sb, err); | |
ac27a0ec DK |
718 | exit_bh: |
719 | brelse(bh); | |
720 | ||
721 | exit_journal: | |
617ba13b | 722 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
723 | err = err2; |
724 | ||
725 | return err; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
617ba13b | 730 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
ac27a0ec DK |
731 | * calling this for the first time. In a sparse filesystem it will be the |
732 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
733 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
734 | */ | |
617ba13b | 735 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
ac27a0ec DK |
736 | unsigned *five, unsigned *seven) |
737 | { | |
738 | unsigned *min = three; | |
739 | int mult = 3; | |
740 | unsigned ret; | |
741 | ||
617ba13b MC |
742 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, |
743 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
ac27a0ec DK |
744 | ret = *min; |
745 | *min += 1; | |
746 | return ret; | |
747 | } | |
748 | ||
749 | if (*five < *min) { | |
750 | min = five; | |
751 | mult = 5; | |
752 | } | |
753 | if (*seven < *min) { | |
754 | min = seven; | |
755 | mult = 7; | |
756 | } | |
757 | ||
758 | ret = *min; | |
759 | *min *= mult; | |
760 | ||
761 | return ret; | |
762 | } | |
763 | ||
764 | /* | |
765 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
766 | * It is assumed that they are stored in group order. Returns the number of | |
767 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
768 | */ | |
769 | static int verify_reserved_gdb(struct super_block *sb, | |
c72df9f9 | 770 | ext4_group_t end, |
ac27a0ec DK |
771 | struct buffer_head *primary) |
772 | { | |
617ba13b | 773 | const ext4_fsblk_t blk = primary->b_blocknr; |
ac27a0ec DK |
774 | unsigned three = 1; |
775 | unsigned five = 5; | |
776 | unsigned seven = 7; | |
777 | unsigned grp; | |
778 | __le32 *p = (__le32 *)primary->b_data; | |
779 | int gdbackups = 0; | |
780 | ||
617ba13b | 781 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
bd81d8ee LV |
782 | if (le32_to_cpu(*p++) != |
783 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ | |
12062ddd | 784 | ext4_warning(sb, "reserved GDT %llu" |
2ae02107 | 785 | " missing grp %d (%llu)", |
ac27a0ec | 786 | blk, grp, |
bd81d8ee LV |
787 | grp * |
788 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
789 | blk); | |
ac27a0ec DK |
790 | return -EINVAL; |
791 | } | |
617ba13b | 792 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
ac27a0ec DK |
793 | return -EFBIG; |
794 | } | |
795 | ||
796 | return gdbackups; | |
797 | } | |
798 | ||
799 | /* | |
800 | * Called when we need to bring a reserved group descriptor table block into | |
801 | * use from the resize inode. The primary copy of the new GDT block currently | |
802 | * is an indirect block (under the double indirect block in the resize inode). | |
803 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
804 | * block, in group order. Even though we know all the block numbers we need, | |
805 | * we check to ensure that the resize inode has actually reserved these blocks. | |
806 | * | |
807 | * Don't need to update the block bitmaps because the blocks are still in use. | |
808 | * | |
809 | * We get all of the error cases out of the way, so that we are sure to not | |
810 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
811 | */ | |
812 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
2f919710 | 813 | ext4_group_t group) |
ac27a0ec DK |
814 | { |
815 | struct super_block *sb = inode->i_sb; | |
617ba13b | 816 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2f919710 | 817 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
617ba13b | 818 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
ac27a0ec DK |
819 | struct buffer_head **o_group_desc, **n_group_desc; |
820 | struct buffer_head *dind; | |
2f919710 | 821 | struct buffer_head *gdb_bh; |
ac27a0ec | 822 | int gdbackups; |
617ba13b | 823 | struct ext4_iloc iloc; |
ac27a0ec DK |
824 | __le32 *data; |
825 | int err; | |
826 | ||
827 | if (test_opt(sb, DEBUG)) | |
828 | printk(KERN_DEBUG | |
617ba13b | 829 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
ac27a0ec DK |
830 | gdb_num); |
831 | ||
af5bc92d TT |
832 | /* |
833 | * If we are not using the primary superblock/GDT copy don't resize, | |
2b2d6d01 TT |
834 | * because the user tools have no way of handling this. Probably a |
835 | * bad time to do it anyways. | |
836 | */ | |
617ba13b MC |
837 | if (EXT4_SB(sb)->s_sbh->b_blocknr != |
838 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { | |
12062ddd | 839 | ext4_warning(sb, "won't resize using backup superblock at %llu", |
617ba13b | 840 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); |
ac27a0ec DK |
841 | return -EPERM; |
842 | } | |
843 | ||
2f919710 YY |
844 | gdb_bh = sb_bread(sb, gdblock); |
845 | if (!gdb_bh) | |
ac27a0ec DK |
846 | return -EIO; |
847 | ||
c72df9f9 | 848 | gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
2f919710 | 849 | if (gdbackups < 0) { |
ac27a0ec DK |
850 | err = gdbackups; |
851 | goto exit_bh; | |
852 | } | |
853 | ||
617ba13b | 854 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
855 | dind = sb_bread(sb, le32_to_cpu(*data)); |
856 | if (!dind) { | |
857 | err = -EIO; | |
858 | goto exit_bh; | |
859 | } | |
860 | ||
861 | data = (__le32 *)dind->b_data; | |
617ba13b | 862 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
12062ddd | 863 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
2f919710 | 864 | group, gdblock); |
ac27a0ec DK |
865 | err = -EINVAL; |
866 | goto exit_dind; | |
867 | } | |
868 | ||
b4097142 TT |
869 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
870 | if (unlikely(err)) | |
ac27a0ec DK |
871 | goto exit_dind; |
872 | ||
2f919710 | 873 | err = ext4_journal_get_write_access(handle, gdb_bh); |
b4097142 | 874 | if (unlikely(err)) |
ac27a0ec DK |
875 | goto exit_sbh; |
876 | ||
b4097142 TT |
877 | err = ext4_journal_get_write_access(handle, dind); |
878 | if (unlikely(err)) | |
879 | ext4_std_error(sb, err); | |
ac27a0ec | 880 | |
617ba13b | 881 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
b4097142 TT |
882 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
883 | if (unlikely(err)) | |
ac27a0ec DK |
884 | goto exit_dindj; |
885 | ||
f18a5f21 TT |
886 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
887 | sizeof(struct buffer_head *), | |
888 | GFP_NOFS); | |
ac27a0ec DK |
889 | if (!n_group_desc) { |
890 | err = -ENOMEM; | |
f18a5f21 TT |
891 | ext4_warning(sb, "not enough memory for %lu groups", |
892 | gdb_num + 1); | |
ac27a0ec DK |
893 | goto exit_inode; |
894 | } | |
895 | ||
896 | /* | |
897 | * Finally, we have all of the possible failures behind us... | |
898 | * | |
899 | * Remove new GDT block from inode double-indirect block and clear out | |
900 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
901 | * from the reserved inode). We don't need to change the bitmaps for | |
902 | * these blocks, because they are marked as in-use from being in the | |
903 | * reserved inode, and will become GDT blocks (primary and backup). | |
904 | */ | |
617ba13b | 905 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
b4097142 TT |
906 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
907 | if (unlikely(err)) { | |
908 | ext4_std_error(sb, err); | |
909 | goto exit_inode; | |
910 | } | |
ac27a0ec | 911 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; |
617ba13b | 912 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
2f919710 YY |
913 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
914 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
b4097142 TT |
915 | if (unlikely(err)) { |
916 | ext4_std_error(sb, err); | |
917 | goto exit_inode; | |
918 | } | |
919 | brelse(dind); | |
ac27a0ec | 920 | |
617ba13b | 921 | o_group_desc = EXT4_SB(sb)->s_group_desc; |
ac27a0ec | 922 | memcpy(n_group_desc, o_group_desc, |
617ba13b | 923 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
2f919710 | 924 | n_group_desc[gdb_num] = gdb_bh; |
617ba13b MC |
925 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
926 | EXT4_SB(sb)->s_gdb_count++; | |
f18a5f21 | 927 | ext4_kvfree(o_group_desc); |
ac27a0ec | 928 | |
e8546d06 | 929 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
b4097142 TT |
930 | err = ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); |
931 | if (err) | |
932 | ext4_std_error(sb, err); | |
ac27a0ec | 933 | |
b4097142 | 934 | return err; |
ac27a0ec DK |
935 | |
936 | exit_inode: | |
f18a5f21 | 937 | ext4_kvfree(n_group_desc); |
537a0310 | 938 | /* ext4_handle_release_buffer(handle, iloc.bh); */ |
ac27a0ec DK |
939 | brelse(iloc.bh); |
940 | exit_dindj: | |
537a0310 | 941 | /* ext4_handle_release_buffer(handle, dind); */ |
ac27a0ec | 942 | exit_sbh: |
537a0310 | 943 | /* ext4_handle_release_buffer(handle, EXT4_SB(sb)->s_sbh); */ |
ac27a0ec DK |
944 | exit_dind: |
945 | brelse(dind); | |
946 | exit_bh: | |
2f919710 | 947 | brelse(gdb_bh); |
ac27a0ec | 948 | |
617ba13b | 949 | ext4_debug("leaving with error %d\n", err); |
ac27a0ec DK |
950 | return err; |
951 | } | |
952 | ||
953 | /* | |
954 | * Called when we are adding a new group which has a backup copy of each of | |
955 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
956 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
957 | * that they are kept for future resizing and not allocated to files. | |
958 | * | |
959 | * Each reserved backup GDT block will go into a different indirect block. | |
960 | * The indirect blocks are actually the primary reserved GDT blocks, | |
961 | * so we know in advance what their block numbers are. We only get the | |
962 | * double-indirect block to verify it is pointing to the primary reserved | |
963 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
964 | * backup GDT blocks are stored in their reserved primary GDT block. | |
965 | */ | |
966 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
668f4dc5 | 967 | ext4_group_t group) |
ac27a0ec DK |
968 | { |
969 | struct super_block *sb = inode->i_sb; | |
617ba13b | 970 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
ac27a0ec DK |
971 | struct buffer_head **primary; |
972 | struct buffer_head *dind; | |
617ba13b MC |
973 | struct ext4_iloc iloc; |
974 | ext4_fsblk_t blk; | |
ac27a0ec DK |
975 | __le32 *data, *end; |
976 | int gdbackups = 0; | |
977 | int res, i; | |
978 | int err; | |
979 | ||
216553c4 | 980 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); |
ac27a0ec DK |
981 | if (!primary) |
982 | return -ENOMEM; | |
983 | ||
617ba13b | 984 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
985 | dind = sb_bread(sb, le32_to_cpu(*data)); |
986 | if (!dind) { | |
987 | err = -EIO; | |
988 | goto exit_free; | |
989 | } | |
990 | ||
617ba13b | 991 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
94460093 JB |
992 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
993 | EXT4_ADDR_PER_BLOCK(sb)); | |
617ba13b | 994 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
ac27a0ec DK |
995 | |
996 | /* Get each reserved primary GDT block and verify it holds backups */ | |
997 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
998 | if (le32_to_cpu(*data) != blk) { | |
12062ddd | 999 | ext4_warning(sb, "reserved block %llu" |
ac27a0ec DK |
1000 | " not at offset %ld", |
1001 | blk, | |
1002 | (long)(data - (__le32 *)dind->b_data)); | |
1003 | err = -EINVAL; | |
1004 | goto exit_bh; | |
1005 | } | |
1006 | primary[res] = sb_bread(sb, blk); | |
1007 | if (!primary[res]) { | |
1008 | err = -EIO; | |
1009 | goto exit_bh; | |
1010 | } | |
c72df9f9 YY |
1011 | gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
1012 | if (gdbackups < 0) { | |
ac27a0ec DK |
1013 | brelse(primary[res]); |
1014 | err = gdbackups; | |
1015 | goto exit_bh; | |
1016 | } | |
1017 | if (++data >= end) | |
1018 | data = (__le32 *)dind->b_data; | |
1019 | } | |
1020 | ||
1021 | for (i = 0; i < reserved_gdb; i++) { | |
617ba13b | 1022 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) { |
ac27a0ec DK |
1023 | /* |
1024 | int j; | |
1025 | for (j = 0; j < i; j++) | |
537a0310 | 1026 | ext4_handle_release_buffer(handle, primary[j]); |
ac27a0ec DK |
1027 | */ |
1028 | goto exit_bh; | |
1029 | } | |
1030 | } | |
1031 | ||
617ba13b | 1032 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
ac27a0ec DK |
1033 | goto exit_bh; |
1034 | ||
1035 | /* | |
1036 | * Finally we can add each of the reserved backup GDT blocks from | |
1037 | * the new group to its reserved primary GDT block. | |
1038 | */ | |
668f4dc5 | 1039 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1040 | for (i = 0; i < reserved_gdb; i++) { |
1041 | int err2; | |
1042 | data = (__le32 *)primary[i]->b_data; | |
1043 | /* printk("reserving backup %lu[%u] = %lu\n", | |
1044 | primary[i]->b_blocknr, gdbackups, | |
1045 | blk + primary[i]->b_blocknr); */ | |
1046 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
0390131b | 1047 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
ac27a0ec DK |
1048 | if (!err) |
1049 | err = err2; | |
1050 | } | |
1051 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; | |
617ba13b | 1052 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
1053 | |
1054 | exit_bh: | |
1055 | while (--res >= 0) | |
1056 | brelse(primary[res]); | |
1057 | brelse(dind); | |
1058 | ||
1059 | exit_free: | |
1060 | kfree(primary); | |
1061 | ||
1062 | return err; | |
1063 | } | |
1064 | ||
1065 | /* | |
617ba13b | 1066 | * Update the backup copies of the ext4 metadata. These don't need to be part |
ac27a0ec DK |
1067 | * of the main resize transaction, because e2fsck will re-write them if there |
1068 | * is a problem (basically only OOM will cause a problem). However, we | |
1069 | * _should_ update the backups if possible, in case the primary gets trashed | |
1070 | * for some reason and we need to run e2fsck from a backup superblock. The | |
1071 | * important part is that the new block and inode counts are in the backup | |
1072 | * superblocks, and the location of the new group metadata in the GDT backups. | |
1073 | * | |
32ed5058 TT |
1074 | * We do not need take the s_resize_lock for this, because these |
1075 | * blocks are not otherwise touched by the filesystem code when it is | |
1076 | * mounted. We don't need to worry about last changing from | |
1077 | * sbi->s_groups_count, because the worst that can happen is that we | |
1078 | * do not copy the full number of backups at this time. The resize | |
1079 | * which changed s_groups_count will backup again. | |
ac27a0ec DK |
1080 | */ |
1081 | static void update_backups(struct super_block *sb, | |
1082 | int blk_off, char *data, int size) | |
1083 | { | |
617ba13b | 1084 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
fd2d4291 | 1085 | const ext4_group_t last = sbi->s_groups_count; |
617ba13b | 1086 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1087 | unsigned three = 1; |
1088 | unsigned five = 5; | |
1089 | unsigned seven = 7; | |
fd2d4291 | 1090 | ext4_group_t group; |
ac27a0ec DK |
1091 | int rest = sb->s_blocksize - size; |
1092 | handle_t *handle; | |
1093 | int err = 0, err2; | |
1094 | ||
617ba13b | 1095 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); |
ac27a0ec DK |
1096 | if (IS_ERR(handle)) { |
1097 | group = 1; | |
1098 | err = PTR_ERR(handle); | |
1099 | goto exit_err; | |
1100 | } | |
1101 | ||
617ba13b | 1102 | while ((group = ext4_list_backups(sb, &three, &five, &seven)) < last) { |
ac27a0ec DK |
1103 | struct buffer_head *bh; |
1104 | ||
1105 | /* Out of journal space, and can't get more - abort - so sad */ | |
0390131b FM |
1106 | if (ext4_handle_valid(handle) && |
1107 | handle->h_buffer_credits == 0 && | |
617ba13b MC |
1108 | ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
1109 | (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) | |
ac27a0ec DK |
1110 | break; |
1111 | ||
1112 | bh = sb_getblk(sb, group * bpg + blk_off); | |
1113 | if (!bh) { | |
1114 | err = -EIO; | |
1115 | break; | |
1116 | } | |
617ba13b | 1117 | ext4_debug("update metadata backup %#04lx\n", |
ac27a0ec | 1118 | (unsigned long)bh->b_blocknr); |
617ba13b | 1119 | if ((err = ext4_journal_get_write_access(handle, bh))) |
ac27a0ec DK |
1120 | break; |
1121 | lock_buffer(bh); | |
1122 | memcpy(bh->b_data, data, size); | |
1123 | if (rest) | |
1124 | memset(bh->b_data + size, 0, rest); | |
1125 | set_buffer_uptodate(bh); | |
1126 | unlock_buffer(bh); | |
b4097142 TT |
1127 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
1128 | if (unlikely(err)) | |
1129 | ext4_std_error(sb, err); | |
ac27a0ec DK |
1130 | brelse(bh); |
1131 | } | |
617ba13b | 1132 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
1133 | err = err2; |
1134 | ||
1135 | /* | |
1136 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
1137 | * late to revert the resize, we shouldn't fail just because of | |
1138 | * the backup copies (they are only needed in case of corruption). | |
1139 | * | |
1140 | * However, if we got here we have a journal problem too, so we | |
1141 | * can't really start a transaction to mark the superblock. | |
1142 | * Chicken out and just set the flag on the hope it will be written | |
1143 | * to disk, and if not - we will simply wait until next fsck. | |
1144 | */ | |
1145 | exit_err: | |
1146 | if (err) { | |
12062ddd | 1147 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
ac27a0ec | 1148 | "forcing fsck on next reboot", group, err); |
617ba13b MC |
1149 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
1150 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec DK |
1151 | mark_buffer_dirty(sbi->s_sbh); |
1152 | } | |
1153 | } | |
1154 | ||
bb08c1e7 YY |
1155 | /* |
1156 | * ext4_add_new_descs() adds @count group descriptor of groups | |
1157 | * starting at @group | |
1158 | * | |
1159 | * @handle: journal handle | |
1160 | * @sb: super block | |
1161 | * @group: the group no. of the first group desc to be added | |
1162 | * @resize_inode: the resize inode | |
1163 | * @count: number of group descriptors to be added | |
1164 | */ | |
1165 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, | |
1166 | ext4_group_t group, struct inode *resize_inode, | |
1167 | ext4_group_t count) | |
1168 | { | |
1169 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1170 | struct ext4_super_block *es = sbi->s_es; | |
1171 | struct buffer_head *gdb_bh; | |
1172 | int i, gdb_off, gdb_num, err = 0; | |
1173 | ||
1174 | for (i = 0; i < count; i++, group++) { | |
1175 | int reserved_gdb = ext4_bg_has_super(sb, group) ? | |
1176 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
1177 | ||
1178 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1179 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1180 | ||
1181 | /* | |
1182 | * We will only either add reserved group blocks to a backup group | |
1183 | * or remove reserved blocks for the first group in a new group block. | |
1184 | * Doing both would be mean more complex code, and sane people don't | |
1185 | * use non-sparse filesystems anymore. This is already checked above. | |
1186 | */ | |
1187 | if (gdb_off) { | |
1188 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1189 | err = ext4_journal_get_write_access(handle, gdb_bh); | |
1190 | ||
1191 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) | |
1192 | err = reserve_backup_gdb(handle, resize_inode, group); | |
1193 | } else | |
1194 | err = add_new_gdb(handle, resize_inode, group); | |
1195 | if (err) | |
1196 | break; | |
1197 | } | |
1198 | return err; | |
1199 | } | |
1200 | ||
083f5b24 YY |
1201 | /* |
1202 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg | |
1203 | */ | |
1204 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, | |
1205 | struct ext4_new_flex_group_data *flex_gd) | |
1206 | { | |
1207 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1208 | struct ext4_group_desc *gdp; | |
1209 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1210 | struct buffer_head *gdb_bh; | |
1211 | ext4_group_t group; | |
1212 | __u16 *bg_flags = flex_gd->bg_flags; | |
1213 | int i, gdb_off, gdb_num, err = 0; | |
1214 | ||
1215 | ||
1216 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { | |
1217 | group = group_data->group; | |
1218 | ||
1219 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1220 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1221 | ||
1222 | /* | |
1223 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). | |
1224 | */ | |
1225 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1226 | /* Update group descriptor block for new group */ | |
1227 | gdp = (struct ext4_group_desc *)((char *)gdb_bh->b_data + | |
1228 | gdb_off * EXT4_DESC_SIZE(sb)); | |
1229 | ||
1230 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); | |
1231 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); | |
1232 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); | |
1233 | ext4_inode_table_set(sb, gdp, group_data->inode_table); | |
1234 | ext4_free_group_clusters_set(sb, gdp, | |
1235 | EXT4_B2C(sbi, group_data->free_blocks_count)); | |
1236 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); | |
1237 | gdp->bg_flags = cpu_to_le16(*bg_flags); | |
1238 | gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp); | |
1239 | ||
1240 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
1241 | if (unlikely(err)) { | |
1242 | ext4_std_error(sb, err); | |
1243 | break; | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * We can allocate memory for mb_alloc based on the new group | |
1248 | * descriptor | |
1249 | */ | |
1250 | err = ext4_mb_add_groupinfo(sb, group, gdp); | |
1251 | if (err) | |
1252 | break; | |
1253 | } | |
1254 | return err; | |
1255 | } | |
1256 | ||
2e10e2f2 YY |
1257 | /* |
1258 | * ext4_update_super() updates the super block so that the newly added | |
1259 | * groups can be seen by the filesystem. | |
1260 | * | |
1261 | * @sb: super block | |
1262 | * @flex_gd: new added groups | |
1263 | */ | |
1264 | static void ext4_update_super(struct super_block *sb, | |
1265 | struct ext4_new_flex_group_data *flex_gd) | |
1266 | { | |
1267 | ext4_fsblk_t blocks_count = 0; | |
1268 | ext4_fsblk_t free_blocks = 0; | |
1269 | ext4_fsblk_t reserved_blocks = 0; | |
1270 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1271 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1272 | struct ext4_super_block *es = sbi->s_es; | |
1273 | int i; | |
1274 | ||
1275 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
1276 | /* | |
1277 | * Make the new blocks and inodes valid next. We do this before | |
1278 | * increasing the group count so that once the group is enabled, | |
1279 | * all of its blocks and inodes are already valid. | |
1280 | * | |
1281 | * We always allocate group-by-group, then block-by-block or | |
1282 | * inode-by-inode within a group, so enabling these | |
1283 | * blocks/inodes before the group is live won't actually let us | |
1284 | * allocate the new space yet. | |
1285 | */ | |
1286 | for (i = 0; i < flex_gd->count; i++) { | |
1287 | blocks_count += group_data[i].blocks_count; | |
1288 | free_blocks += group_data[i].free_blocks_count; | |
1289 | } | |
1290 | ||
1291 | reserved_blocks = ext4_r_blocks_count(es) * 100; | |
1292 | do_div(reserved_blocks, ext4_blocks_count(es)); | |
1293 | reserved_blocks *= blocks_count; | |
1294 | do_div(reserved_blocks, 100); | |
1295 | ||
1296 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); | |
1297 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * | |
1298 | flex_gd->count); | |
1299 | ||
1300 | /* | |
1301 | * We need to protect s_groups_count against other CPUs seeing | |
1302 | * inconsistent state in the superblock. | |
1303 | * | |
1304 | * The precise rules we use are: | |
1305 | * | |
1306 | * * Writers must perform a smp_wmb() after updating all | |
1307 | * dependent data and before modifying the groups count | |
1308 | * | |
1309 | * * Readers must perform an smp_rmb() after reading the groups | |
1310 | * count and before reading any dependent data. | |
1311 | * | |
1312 | * NB. These rules can be relaxed when checking the group count | |
1313 | * while freeing data, as we can only allocate from a block | |
1314 | * group after serialising against the group count, and we can | |
1315 | * only then free after serialising in turn against that | |
1316 | * allocation. | |
1317 | */ | |
1318 | smp_wmb(); | |
1319 | ||
1320 | /* Update the global fs size fields */ | |
1321 | sbi->s_groups_count += flex_gd->count; | |
1322 | ||
1323 | /* Update the reserved block counts only once the new group is | |
1324 | * active. */ | |
1325 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + | |
1326 | reserved_blocks); | |
1327 | ||
1328 | /* Update the free space counts */ | |
1329 | percpu_counter_add(&sbi->s_freeclusters_counter, | |
1330 | EXT4_B2C(sbi, free_blocks)); | |
1331 | percpu_counter_add(&sbi->s_freeinodes_counter, | |
1332 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); | |
1333 | ||
1334 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, | |
1335 | EXT4_FEATURE_INCOMPAT_FLEX_BG) && | |
1336 | sbi->s_log_groups_per_flex) { | |
1337 | ext4_group_t flex_group; | |
1338 | flex_group = ext4_flex_group(sbi, group_data[0].group); | |
1339 | atomic_add(EXT4_B2C(sbi, free_blocks), | |
1340 | &sbi->s_flex_groups[flex_group].free_clusters); | |
1341 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, | |
1342 | &sbi->s_flex_groups[flex_group].free_inodes); | |
1343 | } | |
1344 | ||
1345 | if (test_opt(sb, DEBUG)) | |
1346 | printk(KERN_DEBUG "EXT4-fs: added group %u:" | |
1347 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, | |
1348 | blocks_count, free_blocks, reserved_blocks); | |
1349 | } | |
1350 | ||
ac27a0ec DK |
1351 | /* Add group descriptor data to an existing or new group descriptor block. |
1352 | * Ensure we handle all possible error conditions _before_ we start modifying | |
1353 | * the filesystem, because we cannot abort the transaction and not have it | |
1354 | * write the data to disk. | |
1355 | * | |
1356 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
1357 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
1358 | * | |
1359 | * We only need to hold the superblock lock while we are actually adding | |
1360 | * in the new group's counts to the superblock. Prior to that we have | |
1361 | * not really "added" the group at all. We re-check that we are still | |
1362 | * adding in the last group in case things have changed since verifying. | |
1363 | */ | |
617ba13b | 1364 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
ac27a0ec | 1365 | { |
617ba13b MC |
1366 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1367 | struct ext4_super_block *es = sbi->s_es; | |
1368 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec DK |
1369 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
1370 | struct buffer_head *primary = NULL; | |
617ba13b | 1371 | struct ext4_group_desc *gdp; |
ac27a0ec DK |
1372 | struct inode *inode = NULL; |
1373 | handle_t *handle; | |
1374 | int gdb_off, gdb_num; | |
1375 | int err, err2; | |
1376 | ||
617ba13b MC |
1377 | gdb_num = input->group / EXT4_DESC_PER_BLOCK(sb); |
1378 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec | 1379 | |
617ba13b MC |
1380 | if (gdb_off == 0 && !EXT4_HAS_RO_COMPAT_FEATURE(sb, |
1381 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
12062ddd | 1382 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
ac27a0ec DK |
1383 | return -EPERM; |
1384 | } | |
1385 | ||
bd81d8ee LV |
1386 | if (ext4_blocks_count(es) + input->blocks_count < |
1387 | ext4_blocks_count(es)) { | |
12062ddd | 1388 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1389 | return -EINVAL; |
1390 | } | |
1391 | ||
617ba13b | 1392 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
ac27a0ec | 1393 | le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 1394 | ext4_warning(sb, "inodes_count overflow"); |
ac27a0ec DK |
1395 | return -EINVAL; |
1396 | } | |
1397 | ||
1398 | if (reserved_gdb || gdb_off == 0) { | |
617ba13b | 1399 | if (!EXT4_HAS_COMPAT_FEATURE(sb, |
37609fd5 JB |
1400 | EXT4_FEATURE_COMPAT_RESIZE_INODE) |
1401 | || !le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
12062ddd | 1402 | ext4_warning(sb, |
ac27a0ec DK |
1403 | "No reserved GDT blocks, can't resize"); |
1404 | return -EPERM; | |
1405 | } | |
1d1fe1ee DH |
1406 | inode = ext4_iget(sb, EXT4_RESIZE_INO); |
1407 | if (IS_ERR(inode)) { | |
12062ddd | 1408 | ext4_warning(sb, "Error opening resize inode"); |
1d1fe1ee | 1409 | return PTR_ERR(inode); |
ac27a0ec DK |
1410 | } |
1411 | } | |
1412 | ||
920313a7 | 1413 | |
ac27a0ec DK |
1414 | if ((err = verify_group_input(sb, input))) |
1415 | goto exit_put; | |
1416 | ||
1417 | if ((err = setup_new_group_blocks(sb, input))) | |
1418 | goto exit_put; | |
1419 | ||
1420 | /* | |
1421 | * We will always be modifying at least the superblock and a GDT | |
1422 | * block. If we are adding a group past the last current GDT block, | |
1423 | * we will also modify the inode and the dindirect block. If we | |
1424 | * are adding a group with superblock/GDT backups we will also | |
1425 | * modify each of the reserved GDT dindirect blocks. | |
1426 | */ | |
617ba13b MC |
1427 | handle = ext4_journal_start_sb(sb, |
1428 | ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec DK |
1429 | 3 + reserved_gdb : 4); |
1430 | if (IS_ERR(handle)) { | |
1431 | err = PTR_ERR(handle); | |
1432 | goto exit_put; | |
1433 | } | |
1434 | ||
617ba13b | 1435 | if ((err = ext4_journal_get_write_access(handle, sbi->s_sbh))) |
ac27a0ec DK |
1436 | goto exit_journal; |
1437 | ||
2b2d6d01 TT |
1438 | /* |
1439 | * We will only either add reserved group blocks to a backup group | |
1440 | * or remove reserved blocks for the first group in a new group block. | |
1441 | * Doing both would be mean more complex code, and sane people don't | |
1442 | * use non-sparse filesystems anymore. This is already checked above. | |
1443 | */ | |
ac27a0ec DK |
1444 | if (gdb_off) { |
1445 | primary = sbi->s_group_desc[gdb_num]; | |
617ba13b | 1446 | if ((err = ext4_journal_get_write_access(handle, primary))) |
ac27a0ec DK |
1447 | goto exit_journal; |
1448 | ||
668f4dc5 YY |
1449 | if (reserved_gdb && ext4_bg_num_gdb(sb, input->group)) { |
1450 | err = reserve_backup_gdb(handle, inode, input->group); | |
1451 | if (err) | |
1452 | goto exit_journal; | |
1453 | } | |
2f919710 YY |
1454 | } else { |
1455 | /* | |
1456 | * Note that we can access new group descriptor block safely | |
1457 | * only if add_new_gdb() succeeds. | |
1458 | */ | |
1459 | err = add_new_gdb(handle, inode, input->group); | |
1460 | if (err) | |
1461 | goto exit_journal; | |
1462 | primary = sbi->s_group_desc[gdb_num]; | |
1463 | } | |
ac27a0ec | 1464 | |
2b2d6d01 TT |
1465 | /* |
1466 | * OK, now we've set up the new group. Time to make it active. | |
1467 | * | |
2b2d6d01 TT |
1468 | * so we have to be safe wrt. concurrent accesses the group |
1469 | * data. So we need to be careful to set all of the relevant | |
1470 | * group descriptor data etc. *before* we enable the group. | |
1471 | * | |
1472 | * The key field here is sbi->s_groups_count: as long as | |
1473 | * that retains its old value, nobody is going to access the new | |
1474 | * group. | |
1475 | * | |
1476 | * So first we update all the descriptor metadata for the new | |
1477 | * group; then we update the total disk blocks count; then we | |
1478 | * update the groups count to enable the group; then finally we | |
1479 | * update the free space counts so that the system can start | |
1480 | * using the new disk blocks. | |
1481 | */ | |
ac27a0ec DK |
1482 | |
1483 | /* Update group descriptor block for new group */ | |
2856922c FB |
1484 | gdp = (struct ext4_group_desc *)((char *)primary->b_data + |
1485 | gdb_off * EXT4_DESC_SIZE(sb)); | |
ac27a0ec | 1486 | |
fdff73f0 | 1487 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); |
8fadc143 AR |
1488 | ext4_block_bitmap_set(sb, gdp, input->block_bitmap); /* LV FIXME */ |
1489 | ext4_inode_bitmap_set(sb, gdp, input->inode_bitmap); /* LV FIXME */ | |
1490 | ext4_inode_table_set(sb, gdp, input->inode_table); /* LV FIXME */ | |
021b65bb | 1491 | ext4_free_group_clusters_set(sb, gdp, input->free_blocks_count); |
560671a0 | 1492 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); |
fdff73f0 | 1493 | gdp->bg_flags = cpu_to_le16(EXT4_BG_INODE_ZEROED); |
717d50e4 | 1494 | gdp->bg_checksum = ext4_group_desc_csum(sbi, input->group, gdp); |
ac27a0ec | 1495 | |
5f21b0e6 FB |
1496 | /* |
1497 | * We can allocate memory for mb_alloc based on the new group | |
1498 | * descriptor | |
1499 | */ | |
920313a7 | 1500 | err = ext4_mb_add_groupinfo(sb, input->group, gdp); |
08c3a813 | 1501 | if (err) |
c2ea3fde TT |
1502 | goto exit_journal; |
1503 | ||
ac27a0ec DK |
1504 | /* |
1505 | * Make the new blocks and inodes valid next. We do this before | |
1506 | * increasing the group count so that once the group is enabled, | |
1507 | * all of its blocks and inodes are already valid. | |
1508 | * | |
1509 | * We always allocate group-by-group, then block-by-block or | |
1510 | * inode-by-inode within a group, so enabling these | |
1511 | * blocks/inodes before the group is live won't actually let us | |
1512 | * allocate the new space yet. | |
1513 | */ | |
bd81d8ee | 1514 | ext4_blocks_count_set(es, ext4_blocks_count(es) + |
ac27a0ec | 1515 | input->blocks_count); |
e8546d06 | 1516 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb)); |
ac27a0ec DK |
1517 | |
1518 | /* | |
1519 | * We need to protect s_groups_count against other CPUs seeing | |
1520 | * inconsistent state in the superblock. | |
1521 | * | |
1522 | * The precise rules we use are: | |
1523 | * | |
ac27a0ec DK |
1524 | * * Writers must perform a smp_wmb() after updating all dependent |
1525 | * data and before modifying the groups count | |
1526 | * | |
ac27a0ec DK |
1527 | * * Readers must perform an smp_rmb() after reading the groups count |
1528 | * and before reading any dependent data. | |
1529 | * | |
1530 | * NB. These rules can be relaxed when checking the group count | |
1531 | * while freeing data, as we can only allocate from a block | |
1532 | * group after serialising against the group count, and we can | |
1533 | * only then free after serialising in turn against that | |
1534 | * allocation. | |
1535 | */ | |
1536 | smp_wmb(); | |
1537 | ||
1538 | /* Update the global fs size fields */ | |
1539 | sbi->s_groups_count++; | |
1540 | ||
b4097142 TT |
1541 | err = ext4_handle_dirty_metadata(handle, NULL, primary); |
1542 | if (unlikely(err)) { | |
1543 | ext4_std_error(sb, err); | |
1544 | goto exit_journal; | |
1545 | } | |
ac27a0ec DK |
1546 | |
1547 | /* Update the reserved block counts only once the new group is | |
1548 | * active. */ | |
bd81d8ee | 1549 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + |
ac27a0ec DK |
1550 | input->reserved_blocks); |
1551 | ||
1552 | /* Update the free space counts */ | |
57042651 TT |
1553 | percpu_counter_add(&sbi->s_freeclusters_counter, |
1554 | EXT4_B2C(sbi, input->free_blocks_count)); | |
aa0dff2d | 1555 | percpu_counter_add(&sbi->s_freeinodes_counter, |
617ba13b | 1556 | EXT4_INODES_PER_GROUP(sb)); |
ac27a0ec | 1557 | |
42007efd ES |
1558 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG) && |
1559 | sbi->s_log_groups_per_flex) { | |
c62a11fd FB |
1560 | ext4_group_t flex_group; |
1561 | flex_group = ext4_flex_group(sbi, input->group); | |
24aaa8ef TT |
1562 | atomic_add(EXT4_B2C(sbi, input->free_blocks_count), |
1563 | &sbi->s_flex_groups[flex_group].free_clusters); | |
9f24e420 TT |
1564 | atomic_add(EXT4_INODES_PER_GROUP(sb), |
1565 | &sbi->s_flex_groups[flex_group].free_inodes); | |
c62a11fd FB |
1566 | } |
1567 | ||
a0375156 | 1568 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec DK |
1569 | |
1570 | exit_journal: | |
617ba13b | 1571 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec | 1572 | err = err2; |
2f919710 | 1573 | if (!err && primary) { |
ac27a0ec | 1574 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
617ba13b | 1575 | sizeof(struct ext4_super_block)); |
ac27a0ec DK |
1576 | update_backups(sb, primary->b_blocknr, primary->b_data, |
1577 | primary->b_size); | |
1578 | } | |
1579 | exit_put: | |
1580 | iput(inode); | |
1581 | return err; | |
617ba13b | 1582 | } /* ext4_group_add */ |
ac27a0ec | 1583 | |
18e31438 YY |
1584 | /* |
1585 | * extend a group without checking assuming that checking has been done. | |
1586 | */ | |
1587 | static int ext4_group_extend_no_check(struct super_block *sb, | |
1588 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) | |
1589 | { | |
1590 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1591 | handle_t *handle; | |
1592 | int err = 0, err2; | |
1593 | ||
1594 | /* We will update the superblock, one block bitmap, and | |
1595 | * one group descriptor via ext4_group_add_blocks(). | |
1596 | */ | |
1597 | handle = ext4_journal_start_sb(sb, 3); | |
1598 | if (IS_ERR(handle)) { | |
1599 | err = PTR_ERR(handle); | |
1600 | ext4_warning(sb, "error %d on journal start", err); | |
1601 | return err; | |
1602 | } | |
1603 | ||
1604 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); | |
1605 | if (err) { | |
1606 | ext4_warning(sb, "error %d on journal write access", err); | |
1607 | goto errout; | |
1608 | } | |
1609 | ||
1610 | ext4_blocks_count_set(es, o_blocks_count + add); | |
1611 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, | |
1612 | o_blocks_count + add); | |
1613 | /* We add the blocks to the bitmap and set the group need init bit */ | |
1614 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); | |
1615 | if (err) | |
1616 | goto errout; | |
1617 | ext4_handle_dirty_super(handle, sb); | |
1618 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, | |
1619 | o_blocks_count + add); | |
1620 | errout: | |
1621 | err2 = ext4_journal_stop(handle); | |
1622 | if (err2 && !err) | |
1623 | err = err2; | |
1624 | ||
1625 | if (!err) { | |
1626 | if (test_opt(sb, DEBUG)) | |
1627 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " | |
1628 | "blocks\n", ext4_blocks_count(es)); | |
1629 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es, | |
1630 | sizeof(struct ext4_super_block)); | |
1631 | } | |
1632 | return err; | |
1633 | } | |
1634 | ||
2b2d6d01 TT |
1635 | /* |
1636 | * Extend the filesystem to the new number of blocks specified. This entry | |
ac27a0ec DK |
1637 | * point is only used to extend the current filesystem to the end of the last |
1638 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
1639 | * for emergencies (because it has no dependencies on reserved blocks). | |
1640 | * | |
617ba13b | 1641 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
ac27a0ec DK |
1642 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
1643 | * GDT blocks are reserved to grow to the desired size. | |
1644 | */ | |
617ba13b MC |
1645 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
1646 | ext4_fsblk_t n_blocks_count) | |
ac27a0ec | 1647 | { |
617ba13b | 1648 | ext4_fsblk_t o_blocks_count; |
617ba13b MC |
1649 | ext4_grpblk_t last; |
1650 | ext4_grpblk_t add; | |
af5bc92d | 1651 | struct buffer_head *bh; |
ac27a0ec | 1652 | handle_t *handle; |
cc7365df | 1653 | int err, err2; |
5f21b0e6 | 1654 | ext4_group_t group; |
ac27a0ec | 1655 | |
bd81d8ee | 1656 | o_blocks_count = ext4_blocks_count(es); |
ac27a0ec DK |
1657 | |
1658 | if (test_opt(sb, DEBUG)) | |
2b79b09d | 1659 | printk(KERN_DEBUG "EXT4-fs: extending last group from %llu to %llu blocks\n", |
ac27a0ec DK |
1660 | o_blocks_count, n_blocks_count); |
1661 | ||
1662 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
1663 | return 0; | |
1664 | ||
1665 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
617ba13b | 1666 | printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
2ae02107 | 1667 | " too large to resize to %llu blocks safely\n", |
ac27a0ec DK |
1668 | sb->s_id, n_blocks_count); |
1669 | if (sizeof(sector_t) < 8) | |
12062ddd | 1670 | ext4_warning(sb, "CONFIG_LBDAF not enabled"); |
ac27a0ec DK |
1671 | return -EINVAL; |
1672 | } | |
1673 | ||
1674 | if (n_blocks_count < o_blocks_count) { | |
12062ddd | 1675 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
8f82f840 | 1676 | return -EINVAL; |
ac27a0ec DK |
1677 | } |
1678 | ||
1679 | /* Handle the remaining blocks in the last group only. */ | |
5f21b0e6 | 1680 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
ac27a0ec DK |
1681 | |
1682 | if (last == 0) { | |
12062ddd | 1683 | ext4_warning(sb, "need to use ext2online to resize further"); |
ac27a0ec DK |
1684 | return -EPERM; |
1685 | } | |
1686 | ||
617ba13b | 1687 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
ac27a0ec DK |
1688 | |
1689 | if (o_blocks_count + add < o_blocks_count) { | |
12062ddd | 1690 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1691 | return -EINVAL; |
1692 | } | |
1693 | ||
1694 | if (o_blocks_count + add > n_blocks_count) | |
1695 | add = n_blocks_count - o_blocks_count; | |
1696 | ||
1697 | if (o_blocks_count + add < n_blocks_count) | |
12062ddd | 1698 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
ac27a0ec DK |
1699 | o_blocks_count + add, add); |
1700 | ||
1701 | /* See if the device is actually as big as what was requested */ | |
2b2d6d01 | 1702 | bh = sb_bread(sb, o_blocks_count + add - 1); |
ac27a0ec | 1703 | if (!bh) { |
12062ddd | 1704 | ext4_warning(sb, "can't read last block, resize aborted"); |
ac27a0ec DK |
1705 | return -ENOSPC; |
1706 | } | |
1707 | brelse(bh); | |
1708 | ||
1709 | /* We will update the superblock, one block bitmap, and | |
617ba13b | 1710 | * one group descriptor via ext4_free_blocks(). |
ac27a0ec | 1711 | */ |
617ba13b | 1712 | handle = ext4_journal_start_sb(sb, 3); |
ac27a0ec DK |
1713 | if (IS_ERR(handle)) { |
1714 | err = PTR_ERR(handle); | |
12062ddd | 1715 | ext4_warning(sb, "error %d on journal start", err); |
ac27a0ec DK |
1716 | goto exit_put; |
1717 | } | |
1718 | ||
617ba13b MC |
1719 | if ((err = ext4_journal_get_write_access(handle, |
1720 | EXT4_SB(sb)->s_sbh))) { | |
12062ddd | 1721 | ext4_warning(sb, "error %d on journal write access", err); |
617ba13b | 1722 | ext4_journal_stop(handle); |
ac27a0ec DK |
1723 | goto exit_put; |
1724 | } | |
bd81d8ee | 1725 | ext4_blocks_count_set(es, o_blocks_count + add); |
c549a95d | 1726 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
ac27a0ec | 1727 | o_blocks_count + add); |
e21675d4 | 1728 | /* We add the blocks to the bitmap and set the group need init bit */ |
cc7365df | 1729 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); |
a0375156 | 1730 | ext4_handle_dirty_super(handle, sb); |
2ae02107 | 1731 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, |
ac27a0ec | 1732 | o_blocks_count + add); |
cc7365df YY |
1733 | err2 = ext4_journal_stop(handle); |
1734 | if (!err && err2) | |
1735 | err = err2; | |
1736 | ||
1737 | if (err) | |
ac27a0ec | 1738 | goto exit_put; |
5f21b0e6 | 1739 | |
ac27a0ec | 1740 | if (test_opt(sb, DEBUG)) |
bd81d8ee LV |
1741 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu blocks\n", |
1742 | ext4_blocks_count(es)); | |
617ba13b MC |
1743 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es, |
1744 | sizeof(struct ext4_super_block)); | |
ac27a0ec DK |
1745 | exit_put: |
1746 | return err; | |
617ba13b | 1747 | } /* ext4_group_extend */ |