Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README | |
3 | */ | |
4 | /* Reiserfs block (de)allocator, bitmap-based. */ | |
5 | ||
1da177e4 | 6 | #include <linux/time.h> |
f466c6fd | 7 | #include "reiserfs.h" |
1da177e4 LT |
8 | #include <linux/errno.h> |
9 | #include <linux/buffer_head.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/pagemap.h> | |
6f01046b | 12 | #include <linux/vmalloc.h> |
1da177e4 | 13 | #include <linux/quotaops.h> |
c3aa0776 | 14 | #include <linux/seq_file.h> |
1da177e4 LT |
15 | |
16 | #define PREALLOCATION_SIZE 9 | |
17 | ||
18 | /* different reiserfs block allocator options */ | |
19 | ||
20 | #define SB_ALLOC_OPTS(s) (REISERFS_SB(s)->s_alloc_options.bits) | |
21 | ||
22 | #define _ALLOC_concentrating_formatted_nodes 0 | |
23 | #define _ALLOC_displacing_large_files 1 | |
24 | #define _ALLOC_displacing_new_packing_localities 2 | |
25 | #define _ALLOC_old_hashed_relocation 3 | |
26 | #define _ALLOC_new_hashed_relocation 4 | |
27 | #define _ALLOC_skip_busy 5 | |
28 | #define _ALLOC_displace_based_on_dirid 6 | |
29 | #define _ALLOC_hashed_formatted_nodes 7 | |
30 | #define _ALLOC_old_way 8 | |
31 | #define _ALLOC_hundredth_slices 9 | |
32 | #define _ALLOC_dirid_groups 10 | |
33 | #define _ALLOC_oid_groups 11 | |
34 | #define _ALLOC_packing_groups 12 | |
35 | ||
36 | #define concentrating_formatted_nodes(s) test_bit(_ALLOC_concentrating_formatted_nodes, &SB_ALLOC_OPTS(s)) | |
37 | #define displacing_large_files(s) test_bit(_ALLOC_displacing_large_files, &SB_ALLOC_OPTS(s)) | |
38 | #define displacing_new_packing_localities(s) test_bit(_ALLOC_displacing_new_packing_localities, &SB_ALLOC_OPTS(s)) | |
39 | ||
40 | #define SET_OPTION(optname) \ | |
41 | do { \ | |
1d889d99 JM |
42 | reiserfs_info(s, "block allocator option \"%s\" is set", #optname); \ |
43 | set_bit(_ALLOC_ ## optname , &SB_ALLOC_OPTS(s)); \ | |
1da177e4 LT |
44 | } while(0) |
45 | #define TEST_OPTION(optname, s) \ | |
46 | test_bit(_ALLOC_ ## optname , &SB_ALLOC_OPTS(s)) | |
47 | ||
bd4c625c | 48 | static inline void get_bit_address(struct super_block *s, |
3ee16670 JM |
49 | b_blocknr_t block, |
50 | unsigned int *bmap_nr, | |
51 | unsigned int *offset) | |
1da177e4 | 52 | { |
098297b2 JM |
53 | /* |
54 | * It is in the bitmap block number equal to the block | |
55 | * number divided by the number of bits in a block. | |
56 | */ | |
e1fabd3c | 57 | *bmap_nr = block >> (s->s_blocksize_bits + 3); |
bd4c625c LT |
58 | /* Within that bitmap block it is located at bit offset *offset. */ |
59 | *offset = block & ((s->s_blocksize << 3) - 1); | |
1da177e4 LT |
60 | } |
61 | ||
bd4c625c | 62 | int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value) |
1da177e4 | 63 | { |
3ee16670 | 64 | unsigned int bmap, offset; |
cb680c1b | 65 | unsigned int bmap_count = reiserfs_bmap_count(s); |
1da177e4 | 66 | |
bd4c625c | 67 | if (block == 0 || block >= SB_BLOCK_COUNT(s)) { |
0030b645 JM |
68 | reiserfs_error(s, "vs-4010", |
69 | "block number is out of range %lu (%u)", | |
70 | block, SB_BLOCK_COUNT(s)); | |
bd4c625c | 71 | return 0; |
1da177e4 | 72 | } |
1da177e4 | 73 | |
e1fabd3c JM |
74 | get_bit_address(s, block, &bmap, &offset); |
75 | ||
098297b2 JM |
76 | /* |
77 | * Old format filesystem? Unlikely, but the bitmaps are all | |
78 | * up front so we need to account for it. | |
79 | */ | |
e1fabd3c | 80 | if (unlikely(test_bit(REISERFS_OLD_FORMAT, |
a228bf8f | 81 | &REISERFS_SB(s)->s_properties))) { |
e1fabd3c | 82 | b_blocknr_t bmap1 = REISERFS_SB(s)->s_sbh->b_blocknr + 1; |
cb680c1b JM |
83 | if (block >= bmap1 && |
84 | block <= bmap1 + bmap_count) { | |
0030b645 JM |
85 | reiserfs_error(s, "vs-4019", "bitmap block %lu(%u) " |
86 | "can't be freed or reused", | |
87 | block, bmap_count); | |
e1fabd3c JM |
88 | return 0; |
89 | } | |
90 | } else { | |
91 | if (offset == 0) { | |
0030b645 JM |
92 | reiserfs_error(s, "vs-4020", "bitmap block %lu(%u) " |
93 | "can't be freed or reused", | |
94 | block, bmap_count); | |
bd4c625c LT |
95 | return 0; |
96 | } | |
e1fabd3c | 97 | } |
1da177e4 | 98 | |
cb680c1b | 99 | if (bmap >= bmap_count) { |
0030b645 JM |
100 | reiserfs_error(s, "vs-4030", "bitmap for requested block " |
101 | "is out of range: block=%lu, bitmap_nr=%u", | |
102 | block, bmap); | |
bd4c625c LT |
103 | return 0; |
104 | } | |
1da177e4 | 105 | |
bd4c625c | 106 | if (bit_value == 0 && block == SB_ROOT_BLOCK(s)) { |
0030b645 JM |
107 | reiserfs_error(s, "vs-4050", "this is root block (%u), " |
108 | "it must be busy", SB_ROOT_BLOCK(s)); | |
bd4c625c LT |
109 | return 0; |
110 | } | |
111 | ||
112 | return 1; | |
1da177e4 | 113 | } |
1da177e4 | 114 | |
098297b2 JM |
115 | /* |
116 | * Searches in journal structures for a given block number (bmap, off). | |
117 | * If block is found in reiserfs journal it suggests next free block | |
118 | * candidate to test. | |
119 | */ | |
3ee16670 JM |
120 | static inline int is_block_in_journal(struct super_block *s, unsigned int bmap, |
121 | int off, int *next) | |
1da177e4 | 122 | { |
bd4c625c LT |
123 | b_blocknr_t tmp; |
124 | ||
125 | if (reiserfs_in_journal(s, bmap, off, 1, &tmp)) { | |
126 | if (tmp) { /* hint supplied */ | |
127 | *next = tmp; | |
128 | PROC_INFO_INC(s, scan_bitmap.in_journal_hint); | |
129 | } else { | |
098297b2 | 130 | (*next) = off + 1; /* inc offset to avoid looping. */ |
bd4c625c LT |
131 | PROC_INFO_INC(s, scan_bitmap.in_journal_nohint); |
132 | } | |
133 | PROC_INFO_INC(s, scan_bitmap.retry); | |
134 | return 1; | |
1da177e4 | 135 | } |
bd4c625c | 136 | return 0; |
1da177e4 LT |
137 | } |
138 | ||
098297b2 JM |
139 | /* |
140 | * Searches for a window of zero bits with given minimum and maximum | |
141 | * lengths in one bitmap block | |
142 | */ | |
bd4c625c | 143 | static int scan_bitmap_block(struct reiserfs_transaction_handle *th, |
3ee16670 JM |
144 | unsigned int bmap_n, int *beg, int boundary, |
145 | int min, int max, int unfm) | |
1da177e4 | 146 | { |
bd4c625c LT |
147 | struct super_block *s = th->t_super; |
148 | struct reiserfs_bitmap_info *bi = &SB_AP_BITMAP(s)[bmap_n]; | |
0b3dc17b | 149 | struct buffer_head *bh; |
bd4c625c LT |
150 | int end, next; |
151 | int org = *beg; | |
1da177e4 | 152 | |
bd4c625c | 153 | BUG_ON(!th->t_trans_id); |
cb680c1b JM |
154 | RFALSE(bmap_n >= reiserfs_bmap_count(s), "Bitmap %u is out of " |
155 | "range (0..%u)", bmap_n, reiserfs_bmap_count(s) - 1); | |
bd4c625c | 156 | PROC_INFO_INC(s, scan_bitmap.bmap); |
1da177e4 | 157 | |
bd4c625c | 158 | if (!bi) { |
0030b645 JM |
159 | reiserfs_error(s, "jdm-4055", "NULL bitmap info pointer " |
160 | "for bitmap %d", bmap_n); | |
bd4c625c LT |
161 | return 0; |
162 | } | |
0b3dc17b | 163 | |
5065227b JM |
164 | bh = reiserfs_read_bitmap_block(s, bmap_n); |
165 | if (bh == NULL) | |
166 | return 0; | |
1da177e4 | 167 | |
bd4c625c | 168 | while (1) { |
cf776a7a | 169 | cont: |
0b3dc17b JM |
170 | if (bi->free_count < min) { |
171 | brelse(bh); | |
098297b2 | 172 | return 0; /* No free blocks in this bitmap */ |
0b3dc17b | 173 | } |
bd4c625c | 174 | |
3ad2f3fb | 175 | /* search for a first zero bit -- beginning of a window */ |
bd4c625c | 176 | *beg = reiserfs_find_next_zero_le_bit |
0b3dc17b | 177 | ((unsigned long *)(bh->b_data), boundary, *beg); |
bd4c625c | 178 | |
098297b2 JM |
179 | /* |
180 | * search for a zero bit fails or the rest of bitmap block | |
181 | * cannot contain a zero window of minimum size | |
182 | */ | |
183 | if (*beg + min > boundary) { | |
0b3dc17b | 184 | brelse(bh); |
bd4c625c | 185 | return 0; |
1da177e4 | 186 | } |
1da177e4 | 187 | |
bd4c625c LT |
188 | if (unfm && is_block_in_journal(s, bmap_n, *beg, beg)) |
189 | continue; | |
190 | /* first zero bit found; we check next bits */ | |
191 | for (end = *beg + 1;; end++) { | |
192 | if (end >= *beg + max || end >= boundary | |
0b3dc17b | 193 | || reiserfs_test_le_bit(end, bh->b_data)) { |
bd4c625c LT |
194 | next = end; |
195 | break; | |
196 | } | |
098297b2 JM |
197 | |
198 | /* | |
199 | * finding the other end of zero bit window requires | |
200 | * looking into journal structures (in case of | |
201 | * searching for free blocks for unformatted nodes) | |
202 | */ | |
bd4c625c LT |
203 | if (unfm && is_block_in_journal(s, bmap_n, end, &next)) |
204 | break; | |
205 | } | |
1da177e4 | 206 | |
098297b2 JM |
207 | /* |
208 | * now (*beg) points to beginning of zero bits window, | |
209 | * (end) points to one bit after the window end | |
210 | */ | |
211 | ||
212 | /* found window of proper size */ | |
213 | if (end - *beg >= min) { | |
bd4c625c | 214 | int i; |
0b3dc17b | 215 | reiserfs_prepare_for_journal(s, bh, 1); |
098297b2 JM |
216 | /* |
217 | * try to set all blocks used checking are | |
218 | * they still free | |
219 | */ | |
bd4c625c | 220 | for (i = *beg; i < end; i++) { |
098297b2 | 221 | /* Don't check in journal again. */ |
bd4c625c | 222 | if (reiserfs_test_and_set_le_bit |
0b3dc17b | 223 | (i, bh->b_data)) { |
098297b2 JM |
224 | /* |
225 | * bit was set by another process while | |
226 | * we slept in prepare_for_journal() | |
227 | */ | |
bd4c625c | 228 | PROC_INFO_INC(s, scan_bitmap.stolen); |
098297b2 JM |
229 | |
230 | /* | |
231 | * we can continue with smaller set | |
232 | * of allocated blocks, if length of | |
233 | * this set is more or equal to `min' | |
234 | */ | |
235 | if (i >= *beg + min) { | |
bd4c625c LT |
236 | end = i; |
237 | break; | |
238 | } | |
098297b2 JM |
239 | |
240 | /* | |
241 | * otherwise we clear all bit | |
242 | * were set ... | |
243 | */ | |
bd4c625c | 244 | while (--i >= *beg) |
0c2fd1bf | 245 | reiserfs_clear_le_bit |
0b3dc17b JM |
246 | (i, bh->b_data); |
247 | reiserfs_restore_prepared_buffer(s, bh); | |
bd4c625c | 248 | *beg = org; |
098297b2 JM |
249 | |
250 | /* | |
251 | * Search again in current block | |
252 | * from beginning | |
253 | */ | |
bd4c625c LT |
254 | goto cont; |
255 | } | |
256 | } | |
257 | bi->free_count -= (end - *beg); | |
09f1b80b | 258 | journal_mark_dirty(th, bh); |
0b3dc17b | 259 | brelse(bh); |
bd4c625c LT |
260 | |
261 | /* free block count calculation */ | |
262 | reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), | |
263 | 1); | |
264 | PUT_SB_FREE_BLOCKS(s, SB_FREE_BLOCKS(s) - (end - *beg)); | |
09f1b80b | 265 | journal_mark_dirty(th, SB_BUFFER_WITH_SB(s)); |
bd4c625c LT |
266 | |
267 | return end - (*beg); | |
268 | } else { | |
269 | *beg = next; | |
270 | } | |
1da177e4 | 271 | } |
1da177e4 LT |
272 | } |
273 | ||
bd4c625c LT |
274 | static int bmap_hash_id(struct super_block *s, u32 id) |
275 | { | |
276 | char *hash_in = NULL; | |
277 | unsigned long hash; | |
278 | unsigned bm; | |
279 | ||
280 | if (id <= 2) { | |
281 | bm = 1; | |
282 | } else { | |
283 | hash_in = (char *)(&id); | |
284 | hash = keyed_hash(hash_in, 4); | |
cb680c1b | 285 | bm = hash % reiserfs_bmap_count(s); |
bd4c625c LT |
286 | if (!bm) |
287 | bm = 1; | |
288 | } | |
289 | /* this can only be true when SB_BMAP_NR = 1 */ | |
cb680c1b | 290 | if (bm >= reiserfs_bmap_count(s)) |
bd4c625c LT |
291 | bm = 0; |
292 | return bm; | |
1da177e4 LT |
293 | } |
294 | ||
295 | /* | |
296 | * hashes the id and then returns > 0 if the block group for the | |
297 | * corresponding hash is full | |
298 | */ | |
bd4c625c LT |
299 | static inline int block_group_used(struct super_block *s, u32 id) |
300 | { | |
5065227b JM |
301 | int bm = bmap_hash_id(s, id); |
302 | struct reiserfs_bitmap_info *info = &SB_AP_BITMAP(s)[bm]; | |
303 | ||
098297b2 JM |
304 | /* |
305 | * If we don't have cached information on this bitmap block, we're | |
5065227b | 306 | * going to have to load it later anyway. Loading it here allows us |
c78bad11 | 307 | * to make a better decision. This favors long-term performance gain |
5065227b | 308 | * with a better on-disk layout vs. a short term gain of skipping the |
098297b2 JM |
309 | * read and potentially having a bad placement. |
310 | */ | |
4d20851d | 311 | if (info->free_count == UINT_MAX) { |
5065227b JM |
312 | struct buffer_head *bh = reiserfs_read_bitmap_block(s, bm); |
313 | brelse(bh); | |
314 | } | |
315 | ||
316 | if (info->free_count > ((s->s_blocksize << 3) * 60 / 100)) { | |
bd4c625c LT |
317 | return 0; |
318 | } | |
319 | return 1; | |
1da177e4 LT |
320 | } |
321 | ||
322 | /* | |
323 | * the packing is returned in disk byte order | |
324 | */ | |
bd4c625c | 325 | __le32 reiserfs_choose_packing(struct inode * dir) |
3e8962be | 326 | { |
bd4c625c LT |
327 | __le32 packing; |
328 | if (TEST_OPTION(packing_groups, dir->i_sb)) { | |
329 | u32 parent_dir = le32_to_cpu(INODE_PKEY(dir)->k_dir_id); | |
330 | /* | |
331 | * some versions of reiserfsck expect packing locality 1 to be | |
332 | * special | |
333 | */ | |
334 | if (parent_dir == 1 || block_group_used(dir->i_sb, parent_dir)) | |
335 | packing = INODE_PKEY(dir)->k_objectid; | |
336 | else | |
337 | packing = INODE_PKEY(dir)->k_dir_id; | |
338 | } else | |
339 | packing = INODE_PKEY(dir)->k_objectid; | |
340 | return packing; | |
1da177e4 | 341 | } |
bd4c625c | 342 | |
098297b2 JM |
343 | /* |
344 | * Tries to find contiguous zero bit window (given size) in given region of | |
345 | * bitmap and place new blocks there. Returns number of allocated blocks. | |
346 | */ | |
bd4c625c LT |
347 | static int scan_bitmap(struct reiserfs_transaction_handle *th, |
348 | b_blocknr_t * start, b_blocknr_t finish, | |
3ee16670 | 349 | int min, int max, int unfm, sector_t file_block) |
1da177e4 | 350 | { |
bd4c625c LT |
351 | int nr_allocated = 0; |
352 | struct super_block *s = th->t_super; | |
3ee16670 JM |
353 | unsigned int bm, off; |
354 | unsigned int end_bm, end_off; | |
355 | unsigned int off_max = s->s_blocksize << 3; | |
bd4c625c LT |
356 | |
357 | BUG_ON(!th->t_trans_id); | |
bd4c625c | 358 | PROC_INFO_INC(s, scan_bitmap.call); |
098297b2 JM |
359 | |
360 | /* No point in looking for more free blocks */ | |
bd4c625c | 361 | if (SB_FREE_BLOCKS(s) <= 0) |
098297b2 | 362 | return 0; |
bd4c625c LT |
363 | |
364 | get_bit_address(s, *start, &bm, &off); | |
365 | get_bit_address(s, finish, &end_bm, &end_off); | |
cb680c1b | 366 | if (bm > reiserfs_bmap_count(s)) |
bd4c625c | 367 | return 0; |
cb680c1b JM |
368 | if (end_bm > reiserfs_bmap_count(s)) |
369 | end_bm = reiserfs_bmap_count(s); | |
bd4c625c | 370 | |
098297b2 JM |
371 | /* |
372 | * When the bitmap is more than 10% free, anyone can allocate. | |
bd4c625c LT |
373 | * When it's less than 10% free, only files that already use the |
374 | * bitmap are allowed. Once we pass 80% full, this restriction | |
375 | * is lifted. | |
376 | * | |
377 | * We do this so that files that grow later still have space close to | |
378 | * their original allocation. This improves locality, and presumably | |
379 | * performance as a result. | |
380 | * | |
381 | * This is only an allocation policy and does not make up for getting a | |
382 | * bad hint. Decent hinting must be implemented for this to work well. | |
383 | */ | |
384 | if (TEST_OPTION(skip_busy, s) | |
385 | && SB_FREE_BLOCKS(s) > SB_BLOCK_COUNT(s) / 20) { | |
386 | for (; bm < end_bm; bm++, off = 0) { | |
387 | if ((off && (!unfm || (file_block != 0))) | |
388 | || SB_AP_BITMAP(s)[bm].free_count > | |
389 | (s->s_blocksize << 3) / 10) | |
390 | nr_allocated = | |
391 | scan_bitmap_block(th, bm, &off, off_max, | |
392 | min, max, unfm); | |
393 | if (nr_allocated) | |
394 | goto ret; | |
395 | } | |
396 | /* we know from above that start is a reasonable number */ | |
397 | get_bit_address(s, *start, &bm, &off); | |
398 | } | |
399 | ||
400 | for (; bm < end_bm; bm++, off = 0) { | |
401 | nr_allocated = | |
402 | scan_bitmap_block(th, bm, &off, off_max, min, max, unfm); | |
403 | if (nr_allocated) | |
404 | goto ret; | |
405 | } | |
406 | ||
407 | nr_allocated = | |
408 | scan_bitmap_block(th, bm, &off, end_off + 1, min, max, unfm); | |
409 | ||
cf776a7a | 410 | ret: |
bd4c625c LT |
411 | *start = bm * off_max + off; |
412 | return nr_allocated; | |
1da177e4 LT |
413 | |
414 | } | |
415 | ||
bd4c625c LT |
416 | static void _reiserfs_free_block(struct reiserfs_transaction_handle *th, |
417 | struct inode *inode, b_blocknr_t block, | |
418 | int for_unformatted) | |
1da177e4 | 419 | { |
bd4c625c LT |
420 | struct super_block *s = th->t_super; |
421 | struct reiserfs_super_block *rs; | |
0b3dc17b | 422 | struct buffer_head *sbh, *bmbh; |
bd4c625c | 423 | struct reiserfs_bitmap_info *apbi; |
3ee16670 | 424 | unsigned int nr, offset; |
1da177e4 | 425 | |
bd4c625c | 426 | BUG_ON(!th->t_trans_id); |
bd4c625c | 427 | PROC_INFO_INC(s, free_block); |
bd4c625c LT |
428 | rs = SB_DISK_SUPER_BLOCK(s); |
429 | sbh = SB_BUFFER_WITH_SB(s); | |
430 | apbi = SB_AP_BITMAP(s); | |
1da177e4 | 431 | |
bd4c625c | 432 | get_bit_address(s, block, &nr, &offset); |
1da177e4 | 433 | |
cb680c1b | 434 | if (nr >= reiserfs_bmap_count(s)) { |
0030b645 JM |
435 | reiserfs_error(s, "vs-4075", "block %lu is out of range", |
436 | block); | |
bd4c625c LT |
437 | return; |
438 | } | |
439 | ||
5065227b JM |
440 | bmbh = reiserfs_read_bitmap_block(s, nr); |
441 | if (!bmbh) | |
442 | return; | |
0b3dc17b JM |
443 | |
444 | reiserfs_prepare_for_journal(s, bmbh, 1); | |
bd4c625c LT |
445 | |
446 | /* clear bit for the given block in bit map */ | |
0b3dc17b | 447 | if (!reiserfs_test_and_clear_le_bit(offset, bmbh->b_data)) { |
0030b645 JM |
448 | reiserfs_error(s, "vs-4080", |
449 | "block %lu: bit already cleared", block); | |
bd4c625c LT |
450 | } |
451 | apbi[nr].free_count++; | |
09f1b80b | 452 | journal_mark_dirty(th, bmbh); |
0b3dc17b | 453 | brelse(bmbh); |
bd4c625c LT |
454 | |
455 | reiserfs_prepare_for_journal(s, sbh, 1); | |
456 | /* update super block */ | |
457 | set_sb_free_blocks(rs, sb_free_blocks(rs) + 1); | |
458 | ||
09f1b80b | 459 | journal_mark_dirty(th, sbh); |
d2d0395f JM |
460 | if (for_unformatted) { |
461 | int depth = reiserfs_write_unlock_nested(s); | |
5dd4056d | 462 | dquot_free_block_nodirty(inode, 1); |
d2d0395f JM |
463 | reiserfs_write_lock_nested(s, depth); |
464 | } | |
1da177e4 LT |
465 | } |
466 | ||
bd4c625c LT |
467 | void reiserfs_free_block(struct reiserfs_transaction_handle *th, |
468 | struct inode *inode, b_blocknr_t block, | |
469 | int for_unformatted) | |
1da177e4 | 470 | { |
bd4c625c | 471 | struct super_block *s = th->t_super; |
1da177e4 | 472 | |
ae0a50ab | 473 | BUG_ON(!th->t_trans_id); |
bd4c625c | 474 | RFALSE(!s, "vs-4061: trying to free block on nonexistent device"); |
d4c3d19d JM |
475 | if (!is_reusable(s, block, 1)) |
476 | return; | |
477 | ||
478 | if (block > sb_block_count(REISERFS_SB(s)->s_rs)) { | |
0030b645 | 479 | reiserfs_error(th->t_super, "bitmap-4072", |
d4c3d19d JM |
480 | "Trying to free block outside file system " |
481 | "boundaries (%lu > %lu)", | |
482 | block, sb_block_count(REISERFS_SB(s)->s_rs)); | |
483 | return; | |
484 | } | |
bd4c625c LT |
485 | /* mark it before we clear it, just in case */ |
486 | journal_mark_freed(th, s, block); | |
487 | _reiserfs_free_block(th, inode, block, for_unformatted); | |
1da177e4 LT |
488 | } |
489 | ||
490 | /* preallocated blocks don't need to be run through journal_mark_freed */ | |
bd4c625c LT |
491 | static void reiserfs_free_prealloc_block(struct reiserfs_transaction_handle *th, |
492 | struct inode *inode, b_blocknr_t block) | |
493 | { | |
d4c3d19d | 494 | BUG_ON(!th->t_trans_id); |
bd4c625c LT |
495 | RFALSE(!th->t_super, |
496 | "vs-4060: trying to free block on nonexistent device"); | |
d4c3d19d JM |
497 | if (!is_reusable(th->t_super, block, 1)) |
498 | return; | |
bd4c625c | 499 | _reiserfs_free_block(th, inode, block, 1); |
1da177e4 LT |
500 | } |
501 | ||
bd4c625c LT |
502 | static void __discard_prealloc(struct reiserfs_transaction_handle *th, |
503 | struct reiserfs_inode_info *ei) | |
1da177e4 | 504 | { |
bd4c625c LT |
505 | unsigned long save = ei->i_prealloc_block; |
506 | int dirty = 0; | |
507 | struct inode *inode = &ei->vfs_inode; | |
ae0a50ab | 508 | |
bd4c625c | 509 | BUG_ON(!th->t_trans_id); |
1da177e4 | 510 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c | 511 | if (ei->i_prealloc_count < 0) |
0030b645 JM |
512 | reiserfs_error(th->t_super, "zam-4001", |
513 | "inode has negative prealloc blocks count."); | |
1da177e4 | 514 | #endif |
bd4c625c | 515 | while (ei->i_prealloc_count > 0) { |
08db141b JM |
516 | b_blocknr_t block_to_free; |
517 | ||
518 | /* | |
519 | * reiserfs_free_prealloc_block can drop the write lock, | |
520 | * which could allow another caller to free the same block. | |
521 | * We can protect against it by modifying the prealloc | |
522 | * state before calling it. | |
523 | */ | |
524 | block_to_free = ei->i_prealloc_block++; | |
bd4c625c | 525 | ei->i_prealloc_count--; |
08db141b | 526 | reiserfs_free_prealloc_block(th, inode, block_to_free); |
bd4c625c LT |
527 | dirty = 1; |
528 | } | |
529 | if (dirty) | |
530 | reiserfs_update_sd(th, inode); | |
531 | ei->i_prealloc_block = save; | |
a228bf8f | 532 | list_del_init(&ei->i_prealloc_list); |
1da177e4 LT |
533 | } |
534 | ||
535 | /* FIXME: It should be inline function */ | |
bd4c625c LT |
536 | void reiserfs_discard_prealloc(struct reiserfs_transaction_handle *th, |
537 | struct inode *inode) | |
1da177e4 | 538 | { |
bd4c625c | 539 | struct reiserfs_inode_info *ei = REISERFS_I(inode); |
ae0a50ab | 540 | |
bd4c625c LT |
541 | BUG_ON(!th->t_trans_id); |
542 | if (ei->i_prealloc_count) | |
543 | __discard_prealloc(th, ei); | |
1da177e4 LT |
544 | } |
545 | ||
bd4c625c | 546 | void reiserfs_discard_all_prealloc(struct reiserfs_transaction_handle *th) |
1da177e4 | 547 | { |
bd4c625c | 548 | struct list_head *plist = &SB_JOURNAL(th->t_super)->j_prealloc_list; |
1da177e4 | 549 | |
bd4c625c | 550 | BUG_ON(!th->t_trans_id); |
bd4c625c LT |
551 | while (!list_empty(plist)) { |
552 | struct reiserfs_inode_info *ei; | |
553 | ei = list_entry(plist->next, struct reiserfs_inode_info, | |
554 | i_prealloc_list); | |
1da177e4 | 555 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c | 556 | if (!ei->i_prealloc_count) { |
0030b645 JM |
557 | reiserfs_error(th->t_super, "zam-4001", |
558 | "inode is in prealloc list but has " | |
559 | "no preallocated blocks."); | |
bd4c625c | 560 | } |
1da177e4 | 561 | #endif |
bd4c625c LT |
562 | __discard_prealloc(th, ei); |
563 | } | |
1da177e4 LT |
564 | } |
565 | ||
bd4c625c | 566 | void reiserfs_init_alloc_options(struct super_block *s) |
1da177e4 | 567 | { |
bd4c625c LT |
568 | set_bit(_ALLOC_skip_busy, &SB_ALLOC_OPTS(s)); |
569 | set_bit(_ALLOC_dirid_groups, &SB_ALLOC_OPTS(s)); | |
570 | set_bit(_ALLOC_packing_groups, &SB_ALLOC_OPTS(s)); | |
1da177e4 LT |
571 | } |
572 | ||
573 | /* block allocator related options are parsed here */ | |
bd4c625c | 574 | int reiserfs_parse_alloc_options(struct super_block *s, char *options) |
1da177e4 | 575 | { |
bd4c625c LT |
576 | char *this_char, *value; |
577 | ||
098297b2 JM |
578 | /* clear default settings */ |
579 | REISERFS_SB(s)->s_alloc_options.bits = 0; | |
bd4c625c LT |
580 | |
581 | while ((this_char = strsep(&options, ":")) != NULL) { | |
582 | if ((value = strchr(this_char, '=')) != NULL) | |
583 | *value++ = 0; | |
584 | ||
585 | if (!strcmp(this_char, "concentrating_formatted_nodes")) { | |
586 | int temp; | |
587 | SET_OPTION(concentrating_formatted_nodes); | |
588 | temp = (value | |
589 | && *value) ? simple_strtoul(value, &value, | |
590 | 0) : 10; | |
591 | if (temp <= 0 || temp > 100) { | |
592 | REISERFS_SB(s)->s_alloc_options.border = 10; | |
593 | } else { | |
594 | REISERFS_SB(s)->s_alloc_options.border = | |
595 | 100 / temp; | |
596 | } | |
597 | continue; | |
598 | } | |
599 | if (!strcmp(this_char, "displacing_large_files")) { | |
600 | SET_OPTION(displacing_large_files); | |
601 | REISERFS_SB(s)->s_alloc_options.large_file_size = | |
602 | (value | |
603 | && *value) ? simple_strtoul(value, &value, 0) : 16; | |
604 | continue; | |
605 | } | |
606 | if (!strcmp(this_char, "displacing_new_packing_localities")) { | |
607 | SET_OPTION(displacing_new_packing_localities); | |
608 | continue; | |
ae0a50ab | 609 | } |
bd4c625c LT |
610 | |
611 | if (!strcmp(this_char, "old_hashed_relocation")) { | |
612 | SET_OPTION(old_hashed_relocation); | |
613 | continue; | |
614 | } | |
1da177e4 | 615 | |
bd4c625c LT |
616 | if (!strcmp(this_char, "new_hashed_relocation")) { |
617 | SET_OPTION(new_hashed_relocation); | |
618 | continue; | |
619 | } | |
1da177e4 | 620 | |
bd4c625c LT |
621 | if (!strcmp(this_char, "dirid_groups")) { |
622 | SET_OPTION(dirid_groups); | |
623 | continue; | |
624 | } | |
625 | if (!strcmp(this_char, "oid_groups")) { | |
626 | SET_OPTION(oid_groups); | |
627 | continue; | |
628 | } | |
629 | if (!strcmp(this_char, "packing_groups")) { | |
630 | SET_OPTION(packing_groups); | |
631 | continue; | |
632 | } | |
633 | if (!strcmp(this_char, "hashed_formatted_nodes")) { | |
634 | SET_OPTION(hashed_formatted_nodes); | |
635 | continue; | |
636 | } | |
1da177e4 | 637 | |
bd4c625c LT |
638 | if (!strcmp(this_char, "skip_busy")) { |
639 | SET_OPTION(skip_busy); | |
640 | continue; | |
641 | } | |
1da177e4 | 642 | |
bd4c625c LT |
643 | if (!strcmp(this_char, "hundredth_slices")) { |
644 | SET_OPTION(hundredth_slices); | |
645 | continue; | |
646 | } | |
1da177e4 | 647 | |
bd4c625c LT |
648 | if (!strcmp(this_char, "old_way")) { |
649 | SET_OPTION(old_way); | |
650 | continue; | |
651 | } | |
1da177e4 | 652 | |
bd4c625c LT |
653 | if (!strcmp(this_char, "displace_based_on_dirid")) { |
654 | SET_OPTION(displace_based_on_dirid); | |
655 | continue; | |
656 | } | |
1da177e4 | 657 | |
bd4c625c LT |
658 | if (!strcmp(this_char, "preallocmin")) { |
659 | REISERFS_SB(s)->s_alloc_options.preallocmin = | |
660 | (value | |
661 | && *value) ? simple_strtoul(value, &value, 0) : 4; | |
662 | continue; | |
663 | } | |
664 | ||
665 | if (!strcmp(this_char, "preallocsize")) { | |
666 | REISERFS_SB(s)->s_alloc_options.preallocsize = | |
667 | (value | |
668 | && *value) ? simple_strtoul(value, &value, | |
669 | 0) : | |
670 | PREALLOCATION_SIZE; | |
671 | continue; | |
672 | } | |
1da177e4 | 673 | |
45b03d5e JM |
674 | reiserfs_warning(s, "zam-4001", "unknown option - %s", |
675 | this_char); | |
bd4c625c | 676 | return 1; |
1da177e4 LT |
677 | } |
678 | ||
1d889d99 | 679 | reiserfs_info(s, "allocator options = [%08x]\n", SB_ALLOC_OPTS(s)); |
bd4c625c | 680 | return 0; |
1da177e4 | 681 | } |
bd4c625c | 682 | |
c3aa0776 JK |
683 | static void print_sep(struct seq_file *seq, int *first) |
684 | { | |
685 | if (!*first) | |
686 | seq_puts(seq, ":"); | |
687 | else | |
688 | *first = 0; | |
689 | } | |
690 | ||
691 | void show_alloc_options(struct seq_file *seq, struct super_block *s) | |
692 | { | |
693 | int first = 1; | |
694 | ||
695 | if (SB_ALLOC_OPTS(s) == ((1 << _ALLOC_skip_busy) | | |
696 | (1 << _ALLOC_dirid_groups) | (1 << _ALLOC_packing_groups))) | |
697 | return; | |
698 | ||
699 | seq_puts(seq, ",alloc="); | |
700 | ||
701 | if (TEST_OPTION(concentrating_formatted_nodes, s)) { | |
702 | print_sep(seq, &first); | |
703 | if (REISERFS_SB(s)->s_alloc_options.border != 10) { | |
704 | seq_printf(seq, "concentrating_formatted_nodes=%d", | |
705 | 100 / REISERFS_SB(s)->s_alloc_options.border); | |
706 | } else | |
707 | seq_puts(seq, "concentrating_formatted_nodes"); | |
708 | } | |
709 | if (TEST_OPTION(displacing_large_files, s)) { | |
710 | print_sep(seq, &first); | |
711 | if (REISERFS_SB(s)->s_alloc_options.large_file_size != 16) { | |
712 | seq_printf(seq, "displacing_large_files=%lu", | |
713 | REISERFS_SB(s)->s_alloc_options.large_file_size); | |
714 | } else | |
715 | seq_puts(seq, "displacing_large_files"); | |
716 | } | |
717 | if (TEST_OPTION(displacing_new_packing_localities, s)) { | |
718 | print_sep(seq, &first); | |
719 | seq_puts(seq, "displacing_new_packing_localities"); | |
720 | } | |
721 | if (TEST_OPTION(old_hashed_relocation, s)) { | |
722 | print_sep(seq, &first); | |
723 | seq_puts(seq, "old_hashed_relocation"); | |
724 | } | |
725 | if (TEST_OPTION(new_hashed_relocation, s)) { | |
726 | print_sep(seq, &first); | |
727 | seq_puts(seq, "new_hashed_relocation"); | |
728 | } | |
729 | if (TEST_OPTION(dirid_groups, s)) { | |
730 | print_sep(seq, &first); | |
731 | seq_puts(seq, "dirid_groups"); | |
732 | } | |
733 | if (TEST_OPTION(oid_groups, s)) { | |
734 | print_sep(seq, &first); | |
735 | seq_puts(seq, "oid_groups"); | |
736 | } | |
737 | if (TEST_OPTION(packing_groups, s)) { | |
738 | print_sep(seq, &first); | |
739 | seq_puts(seq, "packing_groups"); | |
740 | } | |
741 | if (TEST_OPTION(hashed_formatted_nodes, s)) { | |
742 | print_sep(seq, &first); | |
743 | seq_puts(seq, "hashed_formatted_nodes"); | |
744 | } | |
745 | if (TEST_OPTION(skip_busy, s)) { | |
746 | print_sep(seq, &first); | |
747 | seq_puts(seq, "skip_busy"); | |
748 | } | |
749 | if (TEST_OPTION(hundredth_slices, s)) { | |
750 | print_sep(seq, &first); | |
751 | seq_puts(seq, "hundredth_slices"); | |
752 | } | |
753 | if (TEST_OPTION(old_way, s)) { | |
754 | print_sep(seq, &first); | |
755 | seq_puts(seq, "old_way"); | |
756 | } | |
757 | if (TEST_OPTION(displace_based_on_dirid, s)) { | |
758 | print_sep(seq, &first); | |
759 | seq_puts(seq, "displace_based_on_dirid"); | |
760 | } | |
761 | if (REISERFS_SB(s)->s_alloc_options.preallocmin != 0) { | |
762 | print_sep(seq, &first); | |
763 | seq_printf(seq, "preallocmin=%d", | |
764 | REISERFS_SB(s)->s_alloc_options.preallocmin); | |
765 | } | |
766 | if (REISERFS_SB(s)->s_alloc_options.preallocsize != 17) { | |
767 | print_sep(seq, &first); | |
768 | seq_printf(seq, "preallocsize=%d", | |
769 | REISERFS_SB(s)->s_alloc_options.preallocsize); | |
770 | } | |
771 | } | |
772 | ||
bd4c625c | 773 | static inline void new_hashed_relocation(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 774 | { |
bd4c625c | 775 | char *hash_in; |
ae0a50ab | 776 | |
bd4c625c LT |
777 | if (hint->formatted_node) { |
778 | hash_in = (char *)&hint->key.k_dir_id; | |
779 | } else { | |
780 | if (!hint->inode) { | |
098297b2 | 781 | /*hint->search_start = hint->beg;*/ |
bd4c625c LT |
782 | hash_in = (char *)&hint->key.k_dir_id; |
783 | } else | |
784 | if (TEST_OPTION(displace_based_on_dirid, hint->th->t_super)) | |
785 | hash_in = (char *)(&INODE_PKEY(hint->inode)->k_dir_id); | |
786 | else | |
787 | hash_in = | |
788 | (char *)(&INODE_PKEY(hint->inode)->k_objectid); | |
789 | } | |
1da177e4 | 790 | |
bd4c625c LT |
791 | hint->search_start = |
792 | hint->beg + keyed_hash(hash_in, 4) % (hint->end - hint->beg); | |
1da177e4 LT |
793 | } |
794 | ||
795 | /* | |
796 | * Relocation based on dirid, hashing them into a given bitmap block | |
c78bad11 | 797 | * files. Formatted nodes are unaffected, a separate policy covers them |
1da177e4 | 798 | */ |
bd4c625c | 799 | static void dirid_groups(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 800 | { |
bd4c625c LT |
801 | unsigned long hash; |
802 | __u32 dirid = 0; | |
803 | int bm = 0; | |
804 | struct super_block *sb = hint->th->t_super; | |
ae0a50ab | 805 | |
1da177e4 | 806 | if (hint->inode) |
bd4c625c LT |
807 | dirid = le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id); |
808 | else if (hint->formatted_node) | |
809 | dirid = hint->key.k_dir_id; | |
810 | ||
811 | if (dirid) { | |
812 | bm = bmap_hash_id(sb, dirid); | |
813 | hash = bm * (sb->s_blocksize << 3); | |
814 | /* give a portion of the block group to metadata */ | |
815 | if (hint->inode) | |
816 | hash += sb->s_blocksize / 2; | |
817 | hint->search_start = hash; | |
818 | } | |
1da177e4 LT |
819 | } |
820 | ||
821 | /* | |
822 | * Relocation based on oid, hashing them into a given bitmap block | |
c78bad11 | 823 | * files. Formatted nodes are unaffected, a separate policy covers them |
1da177e4 | 824 | */ |
bd4c625c | 825 | static void oid_groups(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 826 | { |
bd4c625c LT |
827 | if (hint->inode) { |
828 | unsigned long hash; | |
829 | __u32 oid; | |
830 | __u32 dirid; | |
831 | int bm; | |
832 | ||
833 | dirid = le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id); | |
834 | ||
098297b2 JM |
835 | /* |
836 | * keep the root dir and it's first set of subdirs close to | |
bd4c625c LT |
837 | * the start of the disk |
838 | */ | |
839 | if (dirid <= 2) | |
840 | hash = (hint->inode->i_sb->s_blocksize << 3); | |
841 | else { | |
842 | oid = le32_to_cpu(INODE_PKEY(hint->inode)->k_objectid); | |
843 | bm = bmap_hash_id(hint->inode->i_sb, oid); | |
844 | hash = bm * (hint->inode->i_sb->s_blocksize << 3); | |
845 | } | |
846 | hint->search_start = hash; | |
1da177e4 | 847 | } |
1da177e4 LT |
848 | } |
849 | ||
098297b2 JM |
850 | /* |
851 | * returns 1 if it finds an indirect item and gets valid hint info | |
1da177e4 LT |
852 | * from it, otherwise 0 |
853 | */ | |
bd4c625c | 854 | static int get_left_neighbor(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 855 | { |
fec6d055 | 856 | struct treepath *path; |
bd4c625c LT |
857 | struct buffer_head *bh; |
858 | struct item_head *ih; | |
859 | int pos_in_item; | |
860 | __le32 *item; | |
861 | int ret = 0; | |
862 | ||
098297b2 JM |
863 | /* |
864 | * reiserfs code can call this function w/o pointer to path | |
865 | * structure supplied; then we rely on supplied search_start | |
866 | */ | |
867 | if (!hint->path) | |
bd4c625c LT |
868 | return 0; |
869 | ||
870 | path = hint->path; | |
871 | bh = get_last_bh(path); | |
872 | RFALSE(!bh, "green-4002: Illegal path specified to get_left_neighbor"); | |
4cf5f7ad | 873 | ih = tp_item_head(path); |
bd4c625c | 874 | pos_in_item = path->pos_in_item; |
4cf5f7ad | 875 | item = tp_item_body(path); |
bd4c625c LT |
876 | |
877 | hint->search_start = bh->b_blocknr; | |
878 | ||
098297b2 JM |
879 | /* |
880 | * for indirect item: go to left and look for the first non-hole entry | |
881 | * in the indirect item | |
882 | */ | |
bd4c625c | 883 | if (!hint->formatted_node && is_indirect_le_ih(ih)) { |
bd4c625c LT |
884 | if (pos_in_item == I_UNFM_NUM(ih)) |
885 | pos_in_item--; | |
bd4c625c LT |
886 | while (pos_in_item >= 0) { |
887 | int t = get_block_num(item, pos_in_item); | |
888 | if (t) { | |
889 | hint->search_start = t; | |
890 | ret = 1; | |
891 | break; | |
892 | } | |
893 | pos_in_item--; | |
894 | } | |
1da177e4 | 895 | } |
1da177e4 | 896 | |
bd4c625c LT |
897 | /* does result value fit into specified region? */ |
898 | return ret; | |
1da177e4 LT |
899 | } |
900 | ||
098297b2 JM |
901 | /* |
902 | * should be, if formatted node, then try to put on first part of the device | |
903 | * specified as number of percent with mount option device, else try to put | |
904 | * on last of device. This is not to say it is good code to do so, | |
905 | * but the effect should be measured. | |
906 | */ | |
bd4c625c LT |
907 | static inline void set_border_in_hint(struct super_block *s, |
908 | reiserfs_blocknr_hint_t * hint) | |
1da177e4 | 909 | { |
bd4c625c LT |
910 | b_blocknr_t border = |
911 | SB_BLOCK_COUNT(s) / REISERFS_SB(s)->s_alloc_options.border; | |
1da177e4 | 912 | |
bd4c625c LT |
913 | if (hint->formatted_node) |
914 | hint->end = border - 1; | |
915 | else | |
916 | hint->beg = border; | |
1da177e4 LT |
917 | } |
918 | ||
bd4c625c | 919 | static inline void displace_large_file(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 920 | { |
bd4c625c LT |
921 | if (TEST_OPTION(displace_based_on_dirid, hint->th->t_super)) |
922 | hint->search_start = | |
923 | hint->beg + | |
924 | keyed_hash((char *)(&INODE_PKEY(hint->inode)->k_dir_id), | |
925 | 4) % (hint->end - hint->beg); | |
926 | else | |
927 | hint->search_start = | |
928 | hint->beg + | |
929 | keyed_hash((char *)(&INODE_PKEY(hint->inode)->k_objectid), | |
930 | 4) % (hint->end - hint->beg); | |
1da177e4 LT |
931 | } |
932 | ||
bd4c625c | 933 | static inline void hash_formatted_node(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 934 | { |
bd4c625c | 935 | char *hash_in; |
1da177e4 | 936 | |
bd4c625c LT |
937 | if (!hint->inode) |
938 | hash_in = (char *)&hint->key.k_dir_id; | |
939 | else if (TEST_OPTION(displace_based_on_dirid, hint->th->t_super)) | |
940 | hash_in = (char *)(&INODE_PKEY(hint->inode)->k_dir_id); | |
941 | else | |
942 | hash_in = (char *)(&INODE_PKEY(hint->inode)->k_objectid); | |
1da177e4 | 943 | |
bd4c625c LT |
944 | hint->search_start = |
945 | hint->beg + keyed_hash(hash_in, 4) % (hint->end - hint->beg); | |
1da177e4 LT |
946 | } |
947 | ||
bd4c625c LT |
948 | static inline int |
949 | this_blocknr_allocation_would_make_it_a_large_file(reiserfs_blocknr_hint_t * | |
950 | hint) | |
1da177e4 | 951 | { |
bd4c625c LT |
952 | return hint->block == |
953 | REISERFS_SB(hint->th->t_super)->s_alloc_options.large_file_size; | |
1da177e4 LT |
954 | } |
955 | ||
956 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES | |
bd4c625c | 957 | static inline void displace_new_packing_locality(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 958 | { |
bd4c625c | 959 | struct in_core_key *key = &hint->key; |
1da177e4 | 960 | |
bd4c625c LT |
961 | hint->th->displace_new_blocks = 0; |
962 | hint->search_start = | |
963 | hint->beg + keyed_hash((char *)(&key->k_objectid), | |
964 | 4) % (hint->end - hint->beg); | |
1da177e4 | 965 | } |
bd4c625c | 966 | #endif |
1da177e4 | 967 | |
bd4c625c | 968 | static inline int old_hashed_relocation(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 969 | { |
bd4c625c LT |
970 | b_blocknr_t border; |
971 | u32 hash_in; | |
1da177e4 | 972 | |
bd4c625c LT |
973 | if (hint->formatted_node || hint->inode == NULL) { |
974 | return 0; | |
975 | } | |
1da177e4 | 976 | |
bd4c625c LT |
977 | hash_in = le32_to_cpu((INODE_PKEY(hint->inode))->k_dir_id); |
978 | border = | |
979 | hint->beg + (u32) keyed_hash(((char *)(&hash_in)), | |
980 | 4) % (hint->end - hint->beg - 1); | |
981 | if (border > hint->search_start) | |
982 | hint->search_start = border; | |
1da177e4 | 983 | |
bd4c625c | 984 | return 1; |
1da177e4 LT |
985 | } |
986 | ||
bd4c625c | 987 | static inline int old_way(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 988 | { |
bd4c625c LT |
989 | b_blocknr_t border; |
990 | ||
991 | if (hint->formatted_node || hint->inode == NULL) { | |
992 | return 0; | |
993 | } | |
994 | ||
995 | border = | |
996 | hint->beg + | |
997 | le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id) % (hint->end - | |
998 | hint->beg); | |
999 | if (border > hint->search_start) | |
1000 | hint->search_start = border; | |
1da177e4 | 1001 | |
bd4c625c LT |
1002 | return 1; |
1003 | } | |
1004 | ||
1005 | static inline void hundredth_slices(reiserfs_blocknr_hint_t * hint) | |
1006 | { | |
1007 | struct in_core_key *key = &hint->key; | |
1008 | b_blocknr_t slice_start; | |
1009 | ||
1010 | slice_start = | |
1011 | (keyed_hash((char *)(&key->k_dir_id), 4) % 100) * (hint->end / 100); | |
1012 | if (slice_start > hint->search_start | |
1013 | || slice_start + (hint->end / 100) <= hint->search_start) { | |
1014 | hint->search_start = slice_start; | |
1015 | } | |
1da177e4 | 1016 | } |
bd4c625c LT |
1017 | |
1018 | static void determine_search_start(reiserfs_blocknr_hint_t * hint, | |
1019 | int amount_needed) | |
1da177e4 | 1020 | { |
bd4c625c LT |
1021 | struct super_block *s = hint->th->t_super; |
1022 | int unfm_hint; | |
1da177e4 | 1023 | |
bd4c625c LT |
1024 | hint->beg = 0; |
1025 | hint->end = SB_BLOCK_COUNT(s) - 1; | |
1da177e4 | 1026 | |
bd4c625c LT |
1027 | /* This is former border algorithm. Now with tunable border offset */ |
1028 | if (concentrating_formatted_nodes(s)) | |
1029 | set_border_in_hint(s, hint); | |
1da177e4 LT |
1030 | |
1031 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES | |
098297b2 JM |
1032 | /* |
1033 | * whenever we create a new directory, we displace it. At first | |
1034 | * we will hash for location, later we might look for a moderately | |
1035 | * empty place for it | |
1036 | */ | |
bd4c625c LT |
1037 | if (displacing_new_packing_localities(s) |
1038 | && hint->th->displace_new_blocks) { | |
1039 | displace_new_packing_locality(hint); | |
1040 | ||
098297b2 JM |
1041 | /* |
1042 | * we do not continue determine_search_start, | |
1043 | * if new packing locality is being displaced | |
1044 | */ | |
bd4c625c LT |
1045 | return; |
1046 | } | |
1da177e4 | 1047 | #endif |
1da177e4 | 1048 | |
098297b2 JM |
1049 | /* |
1050 | * all persons should feel encouraged to add more special cases | |
1051 | * here and test them | |
1052 | */ | |
1da177e4 | 1053 | |
bd4c625c LT |
1054 | if (displacing_large_files(s) && !hint->formatted_node |
1055 | && this_blocknr_allocation_would_make_it_a_large_file(hint)) { | |
1056 | displace_large_file(hint); | |
1057 | return; | |
1058 | } | |
1da177e4 | 1059 | |
098297b2 JM |
1060 | /* |
1061 | * if none of our special cases is relevant, use the left | |
1062 | * neighbor in the tree order of the new node we are allocating for | |
1063 | */ | |
bd4c625c LT |
1064 | if (hint->formatted_node && TEST_OPTION(hashed_formatted_nodes, s)) { |
1065 | hash_formatted_node(hint); | |
1066 | return; | |
1067 | } | |
1da177e4 | 1068 | |
bd4c625c LT |
1069 | unfm_hint = get_left_neighbor(hint); |
1070 | ||
098297b2 JM |
1071 | /* |
1072 | * Mimic old block allocator behaviour, that is if VFS allowed for | |
1073 | * preallocation, new blocks are displaced based on directory ID. | |
1074 | * Also, if suggested search_start is less than last preallocated | |
1075 | * block, we start searching from it, assuming that HDD dataflow | |
1076 | * is faster in forward direction | |
1077 | */ | |
bd4c625c LT |
1078 | if (TEST_OPTION(old_way, s)) { |
1079 | if (!hint->formatted_node) { | |
1080 | if (!reiserfs_hashed_relocation(s)) | |
1081 | old_way(hint); | |
1082 | else if (!reiserfs_no_unhashed_relocation(s)) | |
1083 | old_hashed_relocation(hint); | |
1084 | ||
1085 | if (hint->inode | |
1086 | && hint->search_start < | |
1087 | REISERFS_I(hint->inode)->i_prealloc_block) | |
1088 | hint->search_start = | |
1089 | REISERFS_I(hint->inode)->i_prealloc_block; | |
1090 | } | |
1091 | return; | |
1da177e4 | 1092 | } |
1da177e4 | 1093 | |
bd4c625c LT |
1094 | /* This is an approach proposed by Hans */ |
1095 | if (TEST_OPTION(hundredth_slices, s) | |
1096 | && !(displacing_large_files(s) && !hint->formatted_node)) { | |
1097 | hundredth_slices(hint); | |
1098 | return; | |
1099 | } | |
1da177e4 | 1100 | |
bd4c625c LT |
1101 | /* old_hashed_relocation only works on unformatted */ |
1102 | if (!unfm_hint && !hint->formatted_node && | |
1103 | TEST_OPTION(old_hashed_relocation, s)) { | |
1104 | old_hashed_relocation(hint); | |
1105 | } | |
098297b2 | 1106 | |
bd4c625c LT |
1107 | /* new_hashed_relocation works with both formatted/unformatted nodes */ |
1108 | if ((!unfm_hint || hint->formatted_node) && | |
1109 | TEST_OPTION(new_hashed_relocation, s)) { | |
1110 | new_hashed_relocation(hint); | |
1111 | } | |
098297b2 | 1112 | |
bd4c625c LT |
1113 | /* dirid grouping works only on unformatted nodes */ |
1114 | if (!unfm_hint && !hint->formatted_node && TEST_OPTION(dirid_groups, s)) { | |
1115 | dirid_groups(hint); | |
1116 | } | |
1da177e4 | 1117 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
bd4c625c LT |
1118 | if (hint->formatted_node && TEST_OPTION(dirid_groups, s)) { |
1119 | dirid_groups(hint); | |
1120 | } | |
1da177e4 LT |
1121 | #endif |
1122 | ||
bd4c625c LT |
1123 | /* oid grouping works only on unformatted nodes */ |
1124 | if (!unfm_hint && !hint->formatted_node && TEST_OPTION(oid_groups, s)) { | |
1125 | oid_groups(hint); | |
1126 | } | |
1127 | return; | |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | static int determine_prealloc_size(reiserfs_blocknr_hint_t * hint) | |
1131 | { | |
bd4c625c LT |
1132 | /* make minimum size a mount option and benchmark both ways */ |
1133 | /* we preallocate blocks only for regular files, specific size */ | |
1134 | /* benchmark preallocating always and see what happens */ | |
1135 | ||
1136 | hint->prealloc_size = 0; | |
1137 | ||
1138 | if (!hint->formatted_node && hint->preallocate) { | |
54930dfe | 1139 | if (S_ISREG(hint->inode->i_mode) && !IS_PRIVATE(hint->inode) |
bd4c625c LT |
1140 | && hint->inode->i_size >= |
1141 | REISERFS_SB(hint->th->t_super)->s_alloc_options. | |
1142 | preallocmin * hint->inode->i_sb->s_blocksize) | |
1143 | hint->prealloc_size = | |
1144 | REISERFS_SB(hint->th->t_super)->s_alloc_options. | |
1145 | preallocsize - 1; | |
1146 | } | |
1147 | return CARRY_ON; | |
1da177e4 LT |
1148 | } |
1149 | ||
bd4c625c LT |
1150 | static inline int allocate_without_wrapping_disk(reiserfs_blocknr_hint_t * hint, |
1151 | b_blocknr_t * new_blocknrs, | |
1152 | b_blocknr_t start, | |
1153 | b_blocknr_t finish, int min, | |
1154 | int amount_needed, | |
1155 | int prealloc_size) | |
1da177e4 | 1156 | { |
bd4c625c LT |
1157 | int rest = amount_needed; |
1158 | int nr_allocated; | |
1159 | ||
1160 | while (rest > 0 && start <= finish) { | |
1161 | nr_allocated = scan_bitmap(hint->th, &start, finish, min, | |
1162 | rest + prealloc_size, | |
1163 | !hint->formatted_node, hint->block); | |
1164 | ||
1165 | if (nr_allocated == 0) /* no new blocks allocated, return */ | |
1166 | break; | |
1167 | ||
1168 | /* fill free_blocknrs array first */ | |
1169 | while (rest > 0 && nr_allocated > 0) { | |
1170 | *new_blocknrs++ = start++; | |
1171 | rest--; | |
1172 | nr_allocated--; | |
1173 | } | |
1da177e4 | 1174 | |
bd4c625c LT |
1175 | /* do we have something to fill prealloc. array also ? */ |
1176 | if (nr_allocated > 0) { | |
098297b2 JM |
1177 | /* |
1178 | * it means prealloc_size was greater that 0 and | |
1179 | * we do preallocation | |
1180 | */ | |
bd4c625c LT |
1181 | list_add(&REISERFS_I(hint->inode)->i_prealloc_list, |
1182 | &SB_JOURNAL(hint->th->t_super)-> | |
1183 | j_prealloc_list); | |
1184 | REISERFS_I(hint->inode)->i_prealloc_block = start; | |
1185 | REISERFS_I(hint->inode)->i_prealloc_count = | |
1186 | nr_allocated; | |
1187 | break; | |
1188 | } | |
1da177e4 | 1189 | } |
1da177e4 | 1190 | |
bd4c625c | 1191 | return (amount_needed - rest); |
1da177e4 LT |
1192 | } |
1193 | ||
1194 | static inline int blocknrs_and_prealloc_arrays_from_search_start | |
bd4c625c LT |
1195 | (reiserfs_blocknr_hint_t * hint, b_blocknr_t * new_blocknrs, |
1196 | int amount_needed) { | |
1197 | struct super_block *s = hint->th->t_super; | |
1198 | b_blocknr_t start = hint->search_start; | |
1199 | b_blocknr_t finish = SB_BLOCK_COUNT(s) - 1; | |
1200 | int passno = 0; | |
1201 | int nr_allocated = 0; | |
d2d0395f | 1202 | int depth; |
bd4c625c LT |
1203 | |
1204 | determine_prealloc_size(hint); | |
1205 | if (!hint->formatted_node) { | |
1206 | int quota_ret; | |
1da177e4 | 1207 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1208 | reiserfs_debug(s, REISERFS_DEBUG_CODE, |
1209 | "reiserquota: allocating %d blocks id=%u", | |
1210 | amount_needed, hint->inode->i_uid); | |
1da177e4 | 1211 | #endif |
d2d0395f | 1212 | depth = reiserfs_write_unlock_nested(s); |
bd4c625c | 1213 | quota_ret = |
5dd4056d | 1214 | dquot_alloc_block_nodirty(hint->inode, amount_needed); |
d2d0395f JM |
1215 | if (quota_ret) { /* Quota exceeded? */ |
1216 | reiserfs_write_lock_nested(s, depth); | |
bd4c625c | 1217 | return QUOTA_EXCEEDED; |
d2d0395f | 1218 | } |
bd4c625c | 1219 | if (hint->preallocate && hint->prealloc_size) { |
1da177e4 | 1220 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1221 | reiserfs_debug(s, REISERFS_DEBUG_CODE, |
1222 | "reiserquota: allocating (prealloc) %d blocks id=%u", | |
1223 | hint->prealloc_size, hint->inode->i_uid); | |
1da177e4 | 1224 | #endif |
5dd4056d | 1225 | quota_ret = dquot_prealloc_block_nodirty(hint->inode, |
bd4c625c LT |
1226 | hint->prealloc_size); |
1227 | if (quota_ret) | |
1228 | hint->preallocate = hint->prealloc_size = 0; | |
1229 | } | |
1230 | /* for unformatted nodes, force large allocations */ | |
d2d0395f | 1231 | reiserfs_write_lock_nested(s, depth); |
1da177e4 | 1232 | } |
1da177e4 | 1233 | |
bd4c625c | 1234 | do { |
bd4c625c LT |
1235 | switch (passno++) { |
1236 | case 0: /* Search from hint->search_start to end of disk */ | |
1237 | start = hint->search_start; | |
1238 | finish = SB_BLOCK_COUNT(s) - 1; | |
1239 | break; | |
1240 | case 1: /* Search from hint->beg to hint->search_start */ | |
1241 | start = hint->beg; | |
1242 | finish = hint->search_start; | |
1243 | break; | |
1244 | case 2: /* Last chance: Search from 0 to hint->beg */ | |
1245 | start = 0; | |
1246 | finish = hint->beg; | |
1247 | break; | |
098297b2 JM |
1248 | default: |
1249 | /* We've tried searching everywhere, not enough space */ | |
bd4c625c LT |
1250 | /* Free the blocks */ |
1251 | if (!hint->formatted_node) { | |
1da177e4 | 1252 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1253 | reiserfs_debug(s, REISERFS_DEBUG_CODE, |
1254 | "reiserquota: freeing (nospace) %d blocks id=%u", | |
1255 | amount_needed + | |
1256 | hint->prealloc_size - | |
1257 | nr_allocated, | |
1258 | hint->inode->i_uid); | |
1da177e4 | 1259 | #endif |
77db4f25 | 1260 | /* Free not allocated blocks */ |
d2d0395f | 1261 | depth = reiserfs_write_unlock_nested(s); |
5dd4056d | 1262 | dquot_free_block_nodirty(hint->inode, |
77db4f25 JK |
1263 | amount_needed + hint->prealloc_size - |
1264 | nr_allocated); | |
d2d0395f | 1265 | reiserfs_write_lock_nested(s, depth); |
bd4c625c LT |
1266 | } |
1267 | while (nr_allocated--) | |
1268 | reiserfs_free_block(hint->th, hint->inode, | |
1269 | new_blocknrs[nr_allocated], | |
1270 | !hint->formatted_node); | |
1271 | ||
1272 | return NO_DISK_SPACE; | |
1273 | } | |
1274 | } while ((nr_allocated += allocate_without_wrapping_disk(hint, | |
1275 | new_blocknrs + | |
1276 | nr_allocated, | |
1277 | start, finish, | |
9ea0f949 | 1278 | 1, |
bd4c625c LT |
1279 | amount_needed - |
1280 | nr_allocated, | |
1281 | hint-> | |
1282 | prealloc_size)) | |
1283 | < amount_needed); | |
1284 | if (!hint->formatted_node && | |
1285 | amount_needed + hint->prealloc_size > | |
1286 | nr_allocated + REISERFS_I(hint->inode)->i_prealloc_count) { | |
1287 | /* Some of preallocation blocks were not allocated */ | |
1da177e4 | 1288 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1289 | reiserfs_debug(s, REISERFS_DEBUG_CODE, |
1290 | "reiserquota: freeing (failed prealloc) %d blocks id=%u", | |
1291 | amount_needed + hint->prealloc_size - | |
1292 | nr_allocated - | |
1293 | REISERFS_I(hint->inode)->i_prealloc_count, | |
1294 | hint->inode->i_uid); | |
1da177e4 | 1295 | #endif |
d2d0395f JM |
1296 | |
1297 | depth = reiserfs_write_unlock_nested(s); | |
5dd4056d | 1298 | dquot_free_block_nodirty(hint->inode, amount_needed + |
bd4c625c LT |
1299 | hint->prealloc_size - nr_allocated - |
1300 | REISERFS_I(hint->inode)-> | |
1301 | i_prealloc_count); | |
d2d0395f | 1302 | reiserfs_write_lock_nested(s, depth); |
bd4c625c | 1303 | } |
1da177e4 | 1304 | |
bd4c625c | 1305 | return CARRY_ON; |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | /* grab new blocknrs from preallocated list */ | |
1309 | /* return amount still needed after using them */ | |
bd4c625c LT |
1310 | static int use_preallocated_list_if_available(reiserfs_blocknr_hint_t * hint, |
1311 | b_blocknr_t * new_blocknrs, | |
1312 | int amount_needed) | |
1da177e4 | 1313 | { |
bd4c625c | 1314 | struct inode *inode = hint->inode; |
1da177e4 | 1315 | |
bd4c625c LT |
1316 | if (REISERFS_I(inode)->i_prealloc_count > 0) { |
1317 | while (amount_needed) { | |
1da177e4 | 1318 | |
bd4c625c LT |
1319 | *new_blocknrs++ = REISERFS_I(inode)->i_prealloc_block++; |
1320 | REISERFS_I(inode)->i_prealloc_count--; | |
1da177e4 | 1321 | |
bd4c625c | 1322 | amount_needed--; |
1da177e4 | 1323 | |
bd4c625c LT |
1324 | if (REISERFS_I(inode)->i_prealloc_count <= 0) { |
1325 | list_del(&REISERFS_I(inode)->i_prealloc_list); | |
1326 | break; | |
1327 | } | |
1328 | } | |
1da177e4 | 1329 | } |
bd4c625c LT |
1330 | /* return amount still needed after using preallocated blocks */ |
1331 | return amount_needed; | |
1da177e4 LT |
1332 | } |
1333 | ||
098297b2 JM |
1334 | int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *hint, |
1335 | b_blocknr_t *new_blocknrs, | |
1336 | int amount_needed, | |
1337 | /* Amount of blocks we have already reserved */ | |
1338 | int reserved_by_us) | |
1da177e4 | 1339 | { |
bd4c625c LT |
1340 | int initial_amount_needed = amount_needed; |
1341 | int ret; | |
1342 | struct super_block *s = hint->th->t_super; | |
1343 | ||
1344 | /* Check if there is enough space, taking into account reserved space */ | |
1345 | if (SB_FREE_BLOCKS(s) - REISERFS_SB(s)->reserved_blocks < | |
1346 | amount_needed - reserved_by_us) | |
1347 | return NO_DISK_SPACE; | |
1348 | /* should this be if !hint->inode && hint->preallocate? */ | |
1349 | /* do you mean hint->formatted_node can be removed ? - Zam */ | |
098297b2 JM |
1350 | /* |
1351 | * hint->formatted_node cannot be removed because we try to access | |
1352 | * inode information here, and there is often no inode associated with | |
1353 | * metadata allocations - green | |
1354 | */ | |
bd4c625c LT |
1355 | |
1356 | if (!hint->formatted_node && hint->preallocate) { | |
1357 | amount_needed = use_preallocated_list_if_available | |
1358 | (hint, new_blocknrs, amount_needed); | |
098297b2 JM |
1359 | |
1360 | /* | |
1361 | * We have all the block numbers we need from the | |
1362 | * prealloc list | |
1363 | */ | |
1364 | if (amount_needed == 0) | |
bd4c625c LT |
1365 | return CARRY_ON; |
1366 | new_blocknrs += (initial_amount_needed - amount_needed); | |
1367 | } | |
1368 | ||
1369 | /* find search start and save it in hint structure */ | |
1370 | determine_search_start(hint, amount_needed); | |
1371 | if (hint->search_start >= SB_BLOCK_COUNT(s)) | |
1372 | hint->search_start = SB_BLOCK_COUNT(s) - 1; | |
1373 | ||
1374 | /* allocation itself; fill new_blocknrs and preallocation arrays */ | |
1375 | ret = blocknrs_and_prealloc_arrays_from_search_start | |
1da177e4 | 1376 | (hint, new_blocknrs, amount_needed); |
bd4c625c | 1377 | |
098297b2 JM |
1378 | /* |
1379 | * We used prealloc. list to fill (partially) new_blocknrs array. | |
1380 | * If final allocation fails we need to return blocks back to | |
1381 | * prealloc. list or just free them. -- Zam (I chose second | |
1382 | * variant) | |
1383 | */ | |
bd4c625c LT |
1384 | if (ret != CARRY_ON) { |
1385 | while (amount_needed++ < initial_amount_needed) { | |
1386 | reiserfs_free_block(hint->th, hint->inode, | |
1387 | *(--new_blocknrs), 1); | |
1388 | } | |
1da177e4 | 1389 | } |
bd4c625c | 1390 | return ret; |
1da177e4 LT |
1391 | } |
1392 | ||
6f01046b JM |
1393 | void reiserfs_cache_bitmap_metadata(struct super_block *sb, |
1394 | struct buffer_head *bh, | |
1395 | struct reiserfs_bitmap_info *info) | |
1396 | { | |
1397 | unsigned long *cur = (unsigned long *)(bh->b_data + bh->b_size); | |
1398 | ||
4d20851d | 1399 | /* The first bit must ALWAYS be 1 */ |
0030b645 JM |
1400 | if (!reiserfs_test_le_bit(0, (unsigned long *)bh->b_data)) |
1401 | reiserfs_error(sb, "reiserfs-2025", "bitmap block %lu is " | |
1402 | "corrupted: first bit must be 1", bh->b_blocknr); | |
4d20851d JM |
1403 | |
1404 | info->free_count = 0; | |
6f01046b JM |
1405 | |
1406 | while (--cur >= (unsigned long *)bh->b_data) { | |
6f01046b | 1407 | /* 0 and ~0 are special, we can optimize for them */ |
4d20851d | 1408 | if (*cur == 0) |
6f01046b | 1409 | info->free_count += BITS_PER_LONG; |
4d20851d | 1410 | else if (*cur != ~0L) /* A mix, investigate */ |
9d6bf5aa | 1411 | info->free_count += BITS_PER_LONG - hweight_long(*cur); |
6f01046b | 1412 | } |
6f01046b JM |
1413 | } |
1414 | ||
1415 | struct buffer_head *reiserfs_read_bitmap_block(struct super_block *sb, | |
1416 | unsigned int bitmap) | |
1417 | { | |
1418 | b_blocknr_t block = (sb->s_blocksize << 3) * bitmap; | |
5065227b | 1419 | struct reiserfs_bitmap_info *info = SB_AP_BITMAP(sb) + bitmap; |
6f01046b JM |
1420 | struct buffer_head *bh; |
1421 | ||
098297b2 JM |
1422 | /* |
1423 | * Way old format filesystems had the bitmaps packed up front. | |
1424 | * I doubt there are any of these left, but just in case... | |
1425 | */ | |
6f01046b | 1426 | if (unlikely(test_bit(REISERFS_OLD_FORMAT, |
a228bf8f | 1427 | &REISERFS_SB(sb)->s_properties))) |
6f01046b JM |
1428 | block = REISERFS_SB(sb)->s_sbh->b_blocknr + 1 + bitmap; |
1429 | else if (bitmap == 0) | |
1430 | block = (REISERFS_DISK_OFFSET_IN_BYTES >> sb->s_blocksize_bits) + 1; | |
1431 | ||
5065227b JM |
1432 | bh = sb_bread(sb, block); |
1433 | if (bh == NULL) | |
00079e04 | 1434 | reiserfs_warning(sb, "sh-2029: %s: bitmap block (#%u) " |
fbe5498b | 1435 | "reading failed", __func__, block); |
5065227b JM |
1436 | else { |
1437 | if (buffer_locked(bh)) { | |
278f6679 | 1438 | int depth; |
5065227b | 1439 | PROC_INFO_INC(sb, scan_bitmap.wait); |
278f6679 | 1440 | depth = reiserfs_write_unlock_nested(sb); |
5065227b | 1441 | __wait_on_buffer(bh); |
278f6679 | 1442 | reiserfs_write_lock_nested(sb, depth); |
5065227b JM |
1443 | } |
1444 | BUG_ON(!buffer_uptodate(bh)); | |
1445 | BUG_ON(atomic_read(&bh->b_count) == 0); | |
1446 | ||
4d20851d | 1447 | if (info->free_count == UINT_MAX) |
5065227b JM |
1448 | reiserfs_cache_bitmap_metadata(sb, bh, info); |
1449 | } | |
6f01046b JM |
1450 | |
1451 | return bh; | |
1452 | } | |
1453 | ||
1454 | int reiserfs_init_bitmap_cache(struct super_block *sb) | |
1455 | { | |
1456 | struct reiserfs_bitmap_info *bitmap; | |
cb680c1b | 1457 | unsigned int bmap_nr = reiserfs_bmap_count(sb); |
6f01046b | 1458 | |
cb680c1b | 1459 | bitmap = vmalloc(sizeof(*bitmap) * bmap_nr); |
6f01046b JM |
1460 | if (bitmap == NULL) |
1461 | return -ENOMEM; | |
1462 | ||
cb680c1b | 1463 | memset(bitmap, 0xff, sizeof(*bitmap) * bmap_nr); |
6f01046b | 1464 | |
6f01046b JM |
1465 | SB_AP_BITMAP(sb) = bitmap; |
1466 | ||
1467 | return 0; | |
1468 | } | |
5065227b JM |
1469 | |
1470 | void reiserfs_free_bitmap_cache(struct super_block *sb) | |
1471 | { | |
1472 | if (SB_AP_BITMAP(sb)) { | |
1473 | vfree(SB_AP_BITMAP(sb)); | |
1474 | SB_AP_BITMAP(sb) = NULL; | |
1475 | } | |
1476 | } |