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 | { |
bd4c625c LT |
53 | /* It is in the bitmap block number equal to the block |
54 | * number divided by the number of bits in a block. */ | |
e1fabd3c | 55 | *bmap_nr = block >> (s->s_blocksize_bits + 3); |
bd4c625c LT |
56 | /* Within that bitmap block it is located at bit offset *offset. */ |
57 | *offset = block & ((s->s_blocksize << 3) - 1); | |
1da177e4 LT |
58 | } |
59 | ||
bd4c625c | 60 | int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value) |
1da177e4 | 61 | { |
3ee16670 | 62 | unsigned int bmap, offset; |
cb680c1b | 63 | unsigned int bmap_count = reiserfs_bmap_count(s); |
1da177e4 | 64 | |
bd4c625c | 65 | if (block == 0 || block >= SB_BLOCK_COUNT(s)) { |
0030b645 JM |
66 | reiserfs_error(s, "vs-4010", |
67 | "block number is out of range %lu (%u)", | |
68 | block, SB_BLOCK_COUNT(s)); | |
bd4c625c | 69 | return 0; |
1da177e4 | 70 | } |
1da177e4 | 71 | |
e1fabd3c JM |
72 | get_bit_address(s, block, &bmap, &offset); |
73 | ||
74 | /* Old format filesystem? Unlikely, but the bitmaps are all up front so | |
75 | * we need to account for it. */ | |
76 | if (unlikely(test_bit(REISERFS_OLD_FORMAT, | |
77 | &(REISERFS_SB(s)->s_properties)))) { | |
78 | b_blocknr_t bmap1 = REISERFS_SB(s)->s_sbh->b_blocknr + 1; | |
cb680c1b JM |
79 | if (block >= bmap1 && |
80 | block <= bmap1 + bmap_count) { | |
0030b645 JM |
81 | reiserfs_error(s, "vs-4019", "bitmap block %lu(%u) " |
82 | "can't be freed or reused", | |
83 | block, bmap_count); | |
e1fabd3c JM |
84 | return 0; |
85 | } | |
86 | } else { | |
87 | if (offset == 0) { | |
0030b645 JM |
88 | reiserfs_error(s, "vs-4020", "bitmap block %lu(%u) " |
89 | "can't be freed or reused", | |
90 | block, bmap_count); | |
bd4c625c LT |
91 | return 0; |
92 | } | |
e1fabd3c | 93 | } |
1da177e4 | 94 | |
cb680c1b | 95 | if (bmap >= bmap_count) { |
0030b645 JM |
96 | reiserfs_error(s, "vs-4030", "bitmap for requested block " |
97 | "is out of range: block=%lu, bitmap_nr=%u", | |
98 | block, bmap); | |
bd4c625c LT |
99 | return 0; |
100 | } | |
1da177e4 | 101 | |
bd4c625c | 102 | if (bit_value == 0 && block == SB_ROOT_BLOCK(s)) { |
0030b645 JM |
103 | reiserfs_error(s, "vs-4050", "this is root block (%u), " |
104 | "it must be busy", SB_ROOT_BLOCK(s)); | |
bd4c625c LT |
105 | return 0; |
106 | } | |
107 | ||
108 | return 1; | |
1da177e4 | 109 | } |
1da177e4 LT |
110 | |
111 | /* searches in journal structures for a given block number (bmap, off). If block | |
112 | is found in reiserfs journal it suggests next free block candidate to test. */ | |
3ee16670 JM |
113 | static inline int is_block_in_journal(struct super_block *s, unsigned int bmap, |
114 | int off, int *next) | |
1da177e4 | 115 | { |
bd4c625c LT |
116 | b_blocknr_t tmp; |
117 | ||
118 | if (reiserfs_in_journal(s, bmap, off, 1, &tmp)) { | |
119 | if (tmp) { /* hint supplied */ | |
120 | *next = tmp; | |
121 | PROC_INFO_INC(s, scan_bitmap.in_journal_hint); | |
122 | } else { | |
123 | (*next) = off + 1; /* inc offset to avoid looping. */ | |
124 | PROC_INFO_INC(s, scan_bitmap.in_journal_nohint); | |
125 | } | |
126 | PROC_INFO_INC(s, scan_bitmap.retry); | |
127 | return 1; | |
1da177e4 | 128 | } |
bd4c625c | 129 | return 0; |
1da177e4 LT |
130 | } |
131 | ||
132 | /* it searches for a window of zero bits with given minimum and maximum lengths in one bitmap | |
133 | * block; */ | |
bd4c625c | 134 | static int scan_bitmap_block(struct reiserfs_transaction_handle *th, |
3ee16670 JM |
135 | unsigned int bmap_n, int *beg, int boundary, |
136 | int min, int max, int unfm) | |
1da177e4 | 137 | { |
bd4c625c LT |
138 | struct super_block *s = th->t_super; |
139 | struct reiserfs_bitmap_info *bi = &SB_AP_BITMAP(s)[bmap_n]; | |
0b3dc17b | 140 | struct buffer_head *bh; |
bd4c625c LT |
141 | int end, next; |
142 | int org = *beg; | |
1da177e4 | 143 | |
bd4c625c | 144 | BUG_ON(!th->t_trans_id); |
1da177e4 | 145 | |
cb680c1b JM |
146 | RFALSE(bmap_n >= reiserfs_bmap_count(s), "Bitmap %u is out of " |
147 | "range (0..%u)", bmap_n, reiserfs_bmap_count(s) - 1); | |
bd4c625c | 148 | PROC_INFO_INC(s, scan_bitmap.bmap); |
1da177e4 LT |
149 | /* this is unclear and lacks comments, explain how journal bitmaps |
150 | work here for the reader. Convey a sense of the design here. What | |
151 | is a window? */ | |
152 | /* - I mean `a window of zero bits' as in description of this function - Zam. */ | |
1da177e4 | 153 | |
bd4c625c | 154 | if (!bi) { |
0030b645 JM |
155 | reiserfs_error(s, "jdm-4055", "NULL bitmap info pointer " |
156 | "for bitmap %d", bmap_n); | |
bd4c625c LT |
157 | return 0; |
158 | } | |
0b3dc17b | 159 | |
5065227b JM |
160 | bh = reiserfs_read_bitmap_block(s, bmap_n); |
161 | if (bh == NULL) | |
162 | return 0; | |
1da177e4 | 163 | |
bd4c625c LT |
164 | while (1) { |
165 | cont: | |
0b3dc17b JM |
166 | if (bi->free_count < min) { |
167 | brelse(bh); | |
bd4c625c | 168 | return 0; // No free blocks in this bitmap |
0b3dc17b | 169 | } |
bd4c625c | 170 | |
3ad2f3fb | 171 | /* search for a first zero bit -- beginning of a window */ |
bd4c625c | 172 | *beg = reiserfs_find_next_zero_le_bit |
0b3dc17b | 173 | ((unsigned long *)(bh->b_data), boundary, *beg); |
bd4c625c LT |
174 | |
175 | if (*beg + min > boundary) { /* search for a zero bit fails or the rest of bitmap block | |
176 | * cannot contain a zero window of minimum size */ | |
0b3dc17b | 177 | brelse(bh); |
bd4c625c | 178 | return 0; |
1da177e4 | 179 | } |
1da177e4 | 180 | |
bd4c625c LT |
181 | if (unfm && is_block_in_journal(s, bmap_n, *beg, beg)) |
182 | continue; | |
183 | /* first zero bit found; we check next bits */ | |
184 | for (end = *beg + 1;; end++) { | |
185 | if (end >= *beg + max || end >= boundary | |
0b3dc17b | 186 | || reiserfs_test_le_bit(end, bh->b_data)) { |
bd4c625c LT |
187 | next = end; |
188 | break; | |
189 | } | |
190 | /* finding the other end of zero bit window requires looking into journal structures (in | |
191 | * case of searching for free blocks for unformatted nodes) */ | |
192 | if (unfm && is_block_in_journal(s, bmap_n, end, &next)) | |
193 | break; | |
194 | } | |
1da177e4 | 195 | |
bd4c625c LT |
196 | /* now (*beg) points to beginning of zero bits window, |
197 | * (end) points to one bit after the window end */ | |
198 | if (end - *beg >= min) { /* it seems we have found window of proper size */ | |
199 | int i; | |
0b3dc17b | 200 | reiserfs_prepare_for_journal(s, bh, 1); |
bd4c625c LT |
201 | /* try to set all blocks used checking are they still free */ |
202 | for (i = *beg; i < end; i++) { | |
203 | /* It seems that we should not check in journal again. */ | |
204 | if (reiserfs_test_and_set_le_bit | |
0b3dc17b | 205 | (i, bh->b_data)) { |
bd4c625c LT |
206 | /* bit was set by another process |
207 | * while we slept in prepare_for_journal() */ | |
208 | PROC_INFO_INC(s, scan_bitmap.stolen); | |
209 | if (i >= *beg + min) { /* we can continue with smaller set of allocated blocks, | |
210 | * if length of this set is more or equal to `min' */ | |
211 | end = i; | |
212 | break; | |
213 | } | |
214 | /* otherwise we clear all bit were set ... */ | |
215 | while (--i >= *beg) | |
0c2fd1bf | 216 | reiserfs_clear_le_bit |
0b3dc17b JM |
217 | (i, bh->b_data); |
218 | reiserfs_restore_prepared_buffer(s, bh); | |
bd4c625c LT |
219 | *beg = org; |
220 | /* ... and search again in current block from beginning */ | |
221 | goto cont; | |
222 | } | |
223 | } | |
224 | bi->free_count -= (end - *beg); | |
0b3dc17b JM |
225 | journal_mark_dirty(th, s, bh); |
226 | brelse(bh); | |
bd4c625c LT |
227 | |
228 | /* free block count calculation */ | |
229 | reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), | |
230 | 1); | |
231 | PUT_SB_FREE_BLOCKS(s, SB_FREE_BLOCKS(s) - (end - *beg)); | |
232 | journal_mark_dirty(th, s, SB_BUFFER_WITH_SB(s)); | |
233 | ||
234 | return end - (*beg); | |
235 | } else { | |
236 | *beg = next; | |
237 | } | |
1da177e4 | 238 | } |
1da177e4 LT |
239 | } |
240 | ||
bd4c625c LT |
241 | static int bmap_hash_id(struct super_block *s, u32 id) |
242 | { | |
243 | char *hash_in = NULL; | |
244 | unsigned long hash; | |
245 | unsigned bm; | |
246 | ||
247 | if (id <= 2) { | |
248 | bm = 1; | |
249 | } else { | |
250 | hash_in = (char *)(&id); | |
251 | hash = keyed_hash(hash_in, 4); | |
cb680c1b | 252 | bm = hash % reiserfs_bmap_count(s); |
bd4c625c LT |
253 | if (!bm) |
254 | bm = 1; | |
255 | } | |
256 | /* this can only be true when SB_BMAP_NR = 1 */ | |
cb680c1b | 257 | if (bm >= reiserfs_bmap_count(s)) |
bd4c625c LT |
258 | bm = 0; |
259 | return bm; | |
1da177e4 LT |
260 | } |
261 | ||
262 | /* | |
263 | * hashes the id and then returns > 0 if the block group for the | |
264 | * corresponding hash is full | |
265 | */ | |
bd4c625c LT |
266 | static inline int block_group_used(struct super_block *s, u32 id) |
267 | { | |
5065227b JM |
268 | int bm = bmap_hash_id(s, id); |
269 | struct reiserfs_bitmap_info *info = &SB_AP_BITMAP(s)[bm]; | |
270 | ||
271 | /* If we don't have cached information on this bitmap block, we're | |
272 | * going to have to load it later anyway. Loading it here allows us | |
c78bad11 | 273 | * to make a better decision. This favors long-term performance gain |
5065227b JM |
274 | * with a better on-disk layout vs. a short term gain of skipping the |
275 | * read and potentially having a bad placement. */ | |
4d20851d | 276 | if (info->free_count == UINT_MAX) { |
5065227b JM |
277 | struct buffer_head *bh = reiserfs_read_bitmap_block(s, bm); |
278 | brelse(bh); | |
279 | } | |
280 | ||
281 | if (info->free_count > ((s->s_blocksize << 3) * 60 / 100)) { | |
bd4c625c LT |
282 | return 0; |
283 | } | |
284 | return 1; | |
1da177e4 LT |
285 | } |
286 | ||
287 | /* | |
288 | * the packing is returned in disk byte order | |
289 | */ | |
bd4c625c | 290 | __le32 reiserfs_choose_packing(struct inode * dir) |
3e8962be | 291 | { |
bd4c625c LT |
292 | __le32 packing; |
293 | if (TEST_OPTION(packing_groups, dir->i_sb)) { | |
294 | u32 parent_dir = le32_to_cpu(INODE_PKEY(dir)->k_dir_id); | |
295 | /* | |
296 | * some versions of reiserfsck expect packing locality 1 to be | |
297 | * special | |
298 | */ | |
299 | if (parent_dir == 1 || block_group_used(dir->i_sb, parent_dir)) | |
300 | packing = INODE_PKEY(dir)->k_objectid; | |
301 | else | |
302 | packing = INODE_PKEY(dir)->k_dir_id; | |
303 | } else | |
304 | packing = INODE_PKEY(dir)->k_objectid; | |
305 | return packing; | |
1da177e4 | 306 | } |
bd4c625c | 307 | |
1da177e4 LT |
308 | /* Tries to find contiguous zero bit window (given size) in given region of |
309 | * bitmap and place new blocks there. Returns number of allocated blocks. */ | |
bd4c625c LT |
310 | static int scan_bitmap(struct reiserfs_transaction_handle *th, |
311 | b_blocknr_t * start, b_blocknr_t finish, | |
3ee16670 | 312 | int min, int max, int unfm, sector_t file_block) |
1da177e4 | 313 | { |
bd4c625c LT |
314 | int nr_allocated = 0; |
315 | struct super_block *s = th->t_super; | |
316 | /* find every bm and bmap and bmap_nr in this file, and change them all to bitmap_blocknr | |
317 | * - Hans, it is not a block number - Zam. */ | |
318 | ||
3ee16670 JM |
319 | unsigned int bm, off; |
320 | unsigned int end_bm, end_off; | |
321 | unsigned int off_max = s->s_blocksize << 3; | |
bd4c625c LT |
322 | |
323 | BUG_ON(!th->t_trans_id); | |
324 | ||
325 | PROC_INFO_INC(s, scan_bitmap.call); | |
326 | if (SB_FREE_BLOCKS(s) <= 0) | |
327 | return 0; // No point in looking for more free blocks | |
328 | ||
329 | get_bit_address(s, *start, &bm, &off); | |
330 | get_bit_address(s, finish, &end_bm, &end_off); | |
cb680c1b | 331 | if (bm > reiserfs_bmap_count(s)) |
bd4c625c | 332 | return 0; |
cb680c1b JM |
333 | if (end_bm > reiserfs_bmap_count(s)) |
334 | end_bm = reiserfs_bmap_count(s); | |
bd4c625c LT |
335 | |
336 | /* When the bitmap is more than 10% free, anyone can allocate. | |
337 | * When it's less than 10% free, only files that already use the | |
338 | * bitmap are allowed. Once we pass 80% full, this restriction | |
339 | * is lifted. | |
340 | * | |
341 | * We do this so that files that grow later still have space close to | |
342 | * their original allocation. This improves locality, and presumably | |
343 | * performance as a result. | |
344 | * | |
345 | * This is only an allocation policy and does not make up for getting a | |
346 | * bad hint. Decent hinting must be implemented for this to work well. | |
347 | */ | |
348 | if (TEST_OPTION(skip_busy, s) | |
349 | && SB_FREE_BLOCKS(s) > SB_BLOCK_COUNT(s) / 20) { | |
350 | for (; bm < end_bm; bm++, off = 0) { | |
351 | if ((off && (!unfm || (file_block != 0))) | |
352 | || SB_AP_BITMAP(s)[bm].free_count > | |
353 | (s->s_blocksize << 3) / 10) | |
354 | nr_allocated = | |
355 | scan_bitmap_block(th, bm, &off, off_max, | |
356 | min, max, unfm); | |
357 | if (nr_allocated) | |
358 | goto ret; | |
359 | } | |
360 | /* we know from above that start is a reasonable number */ | |
361 | get_bit_address(s, *start, &bm, &off); | |
362 | } | |
363 | ||
364 | for (; bm < end_bm; bm++, off = 0) { | |
365 | nr_allocated = | |
366 | scan_bitmap_block(th, bm, &off, off_max, min, max, unfm); | |
367 | if (nr_allocated) | |
368 | goto ret; | |
369 | } | |
370 | ||
371 | nr_allocated = | |
372 | scan_bitmap_block(th, bm, &off, end_off + 1, min, max, unfm); | |
373 | ||
374 | ret: | |
375 | *start = bm * off_max + off; | |
376 | return nr_allocated; | |
1da177e4 LT |
377 | |
378 | } | |
379 | ||
bd4c625c LT |
380 | static void _reiserfs_free_block(struct reiserfs_transaction_handle *th, |
381 | struct inode *inode, b_blocknr_t block, | |
382 | int for_unformatted) | |
1da177e4 | 383 | { |
bd4c625c LT |
384 | struct super_block *s = th->t_super; |
385 | struct reiserfs_super_block *rs; | |
0b3dc17b | 386 | struct buffer_head *sbh, *bmbh; |
bd4c625c | 387 | struct reiserfs_bitmap_info *apbi; |
3ee16670 | 388 | unsigned int nr, offset; |
1da177e4 | 389 | |
bd4c625c | 390 | BUG_ON(!th->t_trans_id); |
1da177e4 | 391 | |
bd4c625c | 392 | PROC_INFO_INC(s, free_block); |
1da177e4 | 393 | |
bd4c625c LT |
394 | rs = SB_DISK_SUPER_BLOCK(s); |
395 | sbh = SB_BUFFER_WITH_SB(s); | |
396 | apbi = SB_AP_BITMAP(s); | |
1da177e4 | 397 | |
bd4c625c | 398 | get_bit_address(s, block, &nr, &offset); |
1da177e4 | 399 | |
cb680c1b | 400 | if (nr >= reiserfs_bmap_count(s)) { |
0030b645 JM |
401 | reiserfs_error(s, "vs-4075", "block %lu is out of range", |
402 | block); | |
bd4c625c LT |
403 | return; |
404 | } | |
405 | ||
5065227b JM |
406 | bmbh = reiserfs_read_bitmap_block(s, nr); |
407 | if (!bmbh) | |
408 | return; | |
0b3dc17b JM |
409 | |
410 | reiserfs_prepare_for_journal(s, bmbh, 1); | |
bd4c625c LT |
411 | |
412 | /* clear bit for the given block in bit map */ | |
0b3dc17b | 413 | if (!reiserfs_test_and_clear_le_bit(offset, bmbh->b_data)) { |
0030b645 JM |
414 | reiserfs_error(s, "vs-4080", |
415 | "block %lu: bit already cleared", block); | |
bd4c625c LT |
416 | } |
417 | apbi[nr].free_count++; | |
0b3dc17b JM |
418 | journal_mark_dirty(th, s, bmbh); |
419 | brelse(bmbh); | |
bd4c625c LT |
420 | |
421 | reiserfs_prepare_for_journal(s, sbh, 1); | |
422 | /* update super block */ | |
423 | set_sb_free_blocks(rs, sb_free_blocks(rs) + 1); | |
424 | ||
425 | journal_mark_dirty(th, s, sbh); | |
426 | if (for_unformatted) | |
5dd4056d | 427 | dquot_free_block_nodirty(inode, 1); |
1da177e4 LT |
428 | } |
429 | ||
bd4c625c LT |
430 | void reiserfs_free_block(struct reiserfs_transaction_handle *th, |
431 | struct inode *inode, b_blocknr_t block, | |
432 | int for_unformatted) | |
1da177e4 | 433 | { |
bd4c625c | 434 | struct super_block *s = th->t_super; |
bd4c625c | 435 | BUG_ON(!th->t_trans_id); |
1da177e4 | 436 | |
bd4c625c | 437 | RFALSE(!s, "vs-4061: trying to free block on nonexistent device"); |
d4c3d19d JM |
438 | if (!is_reusable(s, block, 1)) |
439 | return; | |
440 | ||
441 | if (block > sb_block_count(REISERFS_SB(s)->s_rs)) { | |
0030b645 | 442 | reiserfs_error(th->t_super, "bitmap-4072", |
d4c3d19d JM |
443 | "Trying to free block outside file system " |
444 | "boundaries (%lu > %lu)", | |
445 | block, sb_block_count(REISERFS_SB(s)->s_rs)); | |
446 | return; | |
447 | } | |
bd4c625c LT |
448 | /* mark it before we clear it, just in case */ |
449 | journal_mark_freed(th, s, block); | |
450 | _reiserfs_free_block(th, inode, block, for_unformatted); | |
1da177e4 LT |
451 | } |
452 | ||
453 | /* preallocated blocks don't need to be run through journal_mark_freed */ | |
bd4c625c LT |
454 | static void reiserfs_free_prealloc_block(struct reiserfs_transaction_handle *th, |
455 | struct inode *inode, b_blocknr_t block) | |
456 | { | |
d4c3d19d | 457 | BUG_ON(!th->t_trans_id); |
bd4c625c LT |
458 | RFALSE(!th->t_super, |
459 | "vs-4060: trying to free block on nonexistent device"); | |
d4c3d19d JM |
460 | if (!is_reusable(th->t_super, block, 1)) |
461 | return; | |
bd4c625c | 462 | _reiserfs_free_block(th, inode, block, 1); |
1da177e4 LT |
463 | } |
464 | ||
bd4c625c LT |
465 | static void __discard_prealloc(struct reiserfs_transaction_handle *th, |
466 | struct reiserfs_inode_info *ei) | |
1da177e4 | 467 | { |
bd4c625c LT |
468 | unsigned long save = ei->i_prealloc_block; |
469 | int dirty = 0; | |
470 | struct inode *inode = &ei->vfs_inode; | |
471 | BUG_ON(!th->t_trans_id); | |
1da177e4 | 472 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c | 473 | if (ei->i_prealloc_count < 0) |
0030b645 JM |
474 | reiserfs_error(th->t_super, "zam-4001", |
475 | "inode has negative prealloc blocks count."); | |
1da177e4 | 476 | #endif |
bd4c625c LT |
477 | while (ei->i_prealloc_count > 0) { |
478 | reiserfs_free_prealloc_block(th, inode, ei->i_prealloc_block); | |
479 | ei->i_prealloc_block++; | |
480 | ei->i_prealloc_count--; | |
481 | dirty = 1; | |
482 | } | |
483 | if (dirty) | |
484 | reiserfs_update_sd(th, inode); | |
485 | ei->i_prealloc_block = save; | |
486 | list_del_init(&(ei->i_prealloc_list)); | |
1da177e4 LT |
487 | } |
488 | ||
489 | /* FIXME: It should be inline function */ | |
bd4c625c LT |
490 | void reiserfs_discard_prealloc(struct reiserfs_transaction_handle *th, |
491 | struct inode *inode) | |
1da177e4 | 492 | { |
bd4c625c LT |
493 | struct reiserfs_inode_info *ei = REISERFS_I(inode); |
494 | BUG_ON(!th->t_trans_id); | |
495 | if (ei->i_prealloc_count) | |
496 | __discard_prealloc(th, ei); | |
1da177e4 LT |
497 | } |
498 | ||
bd4c625c | 499 | void reiserfs_discard_all_prealloc(struct reiserfs_transaction_handle *th) |
1da177e4 | 500 | { |
bd4c625c | 501 | struct list_head *plist = &SB_JOURNAL(th->t_super)->j_prealloc_list; |
1da177e4 | 502 | |
bd4c625c | 503 | BUG_ON(!th->t_trans_id); |
1da177e4 | 504 | |
bd4c625c LT |
505 | while (!list_empty(plist)) { |
506 | struct reiserfs_inode_info *ei; | |
507 | ei = list_entry(plist->next, struct reiserfs_inode_info, | |
508 | i_prealloc_list); | |
1da177e4 | 509 | #ifdef CONFIG_REISERFS_CHECK |
bd4c625c | 510 | if (!ei->i_prealloc_count) { |
0030b645 JM |
511 | reiserfs_error(th->t_super, "zam-4001", |
512 | "inode is in prealloc list but has " | |
513 | "no preallocated blocks."); | |
bd4c625c | 514 | } |
1da177e4 | 515 | #endif |
bd4c625c LT |
516 | __discard_prealloc(th, ei); |
517 | } | |
1da177e4 LT |
518 | } |
519 | ||
bd4c625c | 520 | void reiserfs_init_alloc_options(struct super_block *s) |
1da177e4 | 521 | { |
bd4c625c LT |
522 | set_bit(_ALLOC_skip_busy, &SB_ALLOC_OPTS(s)); |
523 | set_bit(_ALLOC_dirid_groups, &SB_ALLOC_OPTS(s)); | |
524 | set_bit(_ALLOC_packing_groups, &SB_ALLOC_OPTS(s)); | |
1da177e4 LT |
525 | } |
526 | ||
527 | /* block allocator related options are parsed here */ | |
bd4c625c | 528 | int reiserfs_parse_alloc_options(struct super_block *s, char *options) |
1da177e4 | 529 | { |
bd4c625c LT |
530 | char *this_char, *value; |
531 | ||
532 | REISERFS_SB(s)->s_alloc_options.bits = 0; /* clear default settings */ | |
533 | ||
534 | while ((this_char = strsep(&options, ":")) != NULL) { | |
535 | if ((value = strchr(this_char, '=')) != NULL) | |
536 | *value++ = 0; | |
537 | ||
538 | if (!strcmp(this_char, "concentrating_formatted_nodes")) { | |
539 | int temp; | |
540 | SET_OPTION(concentrating_formatted_nodes); | |
541 | temp = (value | |
542 | && *value) ? simple_strtoul(value, &value, | |
543 | 0) : 10; | |
544 | if (temp <= 0 || temp > 100) { | |
545 | REISERFS_SB(s)->s_alloc_options.border = 10; | |
546 | } else { | |
547 | REISERFS_SB(s)->s_alloc_options.border = | |
548 | 100 / temp; | |
549 | } | |
550 | continue; | |
551 | } | |
552 | if (!strcmp(this_char, "displacing_large_files")) { | |
553 | SET_OPTION(displacing_large_files); | |
554 | REISERFS_SB(s)->s_alloc_options.large_file_size = | |
555 | (value | |
556 | && *value) ? simple_strtoul(value, &value, 0) : 16; | |
557 | continue; | |
558 | } | |
559 | if (!strcmp(this_char, "displacing_new_packing_localities")) { | |
560 | SET_OPTION(displacing_new_packing_localities); | |
561 | continue; | |
562 | }; | |
563 | ||
564 | if (!strcmp(this_char, "old_hashed_relocation")) { | |
565 | SET_OPTION(old_hashed_relocation); | |
566 | continue; | |
567 | } | |
1da177e4 | 568 | |
bd4c625c LT |
569 | if (!strcmp(this_char, "new_hashed_relocation")) { |
570 | SET_OPTION(new_hashed_relocation); | |
571 | continue; | |
572 | } | |
1da177e4 | 573 | |
bd4c625c LT |
574 | if (!strcmp(this_char, "dirid_groups")) { |
575 | SET_OPTION(dirid_groups); | |
576 | continue; | |
577 | } | |
578 | if (!strcmp(this_char, "oid_groups")) { | |
579 | SET_OPTION(oid_groups); | |
580 | continue; | |
581 | } | |
582 | if (!strcmp(this_char, "packing_groups")) { | |
583 | SET_OPTION(packing_groups); | |
584 | continue; | |
585 | } | |
586 | if (!strcmp(this_char, "hashed_formatted_nodes")) { | |
587 | SET_OPTION(hashed_formatted_nodes); | |
588 | continue; | |
589 | } | |
1da177e4 | 590 | |
bd4c625c LT |
591 | if (!strcmp(this_char, "skip_busy")) { |
592 | SET_OPTION(skip_busy); | |
593 | continue; | |
594 | } | |
1da177e4 | 595 | |
bd4c625c LT |
596 | if (!strcmp(this_char, "hundredth_slices")) { |
597 | SET_OPTION(hundredth_slices); | |
598 | continue; | |
599 | } | |
1da177e4 | 600 | |
bd4c625c LT |
601 | if (!strcmp(this_char, "old_way")) { |
602 | SET_OPTION(old_way); | |
603 | continue; | |
604 | } | |
1da177e4 | 605 | |
bd4c625c LT |
606 | if (!strcmp(this_char, "displace_based_on_dirid")) { |
607 | SET_OPTION(displace_based_on_dirid); | |
608 | continue; | |
609 | } | |
1da177e4 | 610 | |
bd4c625c LT |
611 | if (!strcmp(this_char, "preallocmin")) { |
612 | REISERFS_SB(s)->s_alloc_options.preallocmin = | |
613 | (value | |
614 | && *value) ? simple_strtoul(value, &value, 0) : 4; | |
615 | continue; | |
616 | } | |
617 | ||
618 | if (!strcmp(this_char, "preallocsize")) { | |
619 | REISERFS_SB(s)->s_alloc_options.preallocsize = | |
620 | (value | |
621 | && *value) ? simple_strtoul(value, &value, | |
622 | 0) : | |
623 | PREALLOCATION_SIZE; | |
624 | continue; | |
625 | } | |
1da177e4 | 626 | |
45b03d5e JM |
627 | reiserfs_warning(s, "zam-4001", "unknown option - %s", |
628 | this_char); | |
bd4c625c | 629 | return 1; |
1da177e4 LT |
630 | } |
631 | ||
1d889d99 | 632 | reiserfs_info(s, "allocator options = [%08x]\n", SB_ALLOC_OPTS(s)); |
bd4c625c | 633 | return 0; |
1da177e4 | 634 | } |
bd4c625c | 635 | |
c3aa0776 JK |
636 | static void print_sep(struct seq_file *seq, int *first) |
637 | { | |
638 | if (!*first) | |
639 | seq_puts(seq, ":"); | |
640 | else | |
641 | *first = 0; | |
642 | } | |
643 | ||
644 | void show_alloc_options(struct seq_file *seq, struct super_block *s) | |
645 | { | |
646 | int first = 1; | |
647 | ||
648 | if (SB_ALLOC_OPTS(s) == ((1 << _ALLOC_skip_busy) | | |
649 | (1 << _ALLOC_dirid_groups) | (1 << _ALLOC_packing_groups))) | |
650 | return; | |
651 | ||
652 | seq_puts(seq, ",alloc="); | |
653 | ||
654 | if (TEST_OPTION(concentrating_formatted_nodes, s)) { | |
655 | print_sep(seq, &first); | |
656 | if (REISERFS_SB(s)->s_alloc_options.border != 10) { | |
657 | seq_printf(seq, "concentrating_formatted_nodes=%d", | |
658 | 100 / REISERFS_SB(s)->s_alloc_options.border); | |
659 | } else | |
660 | seq_puts(seq, "concentrating_formatted_nodes"); | |
661 | } | |
662 | if (TEST_OPTION(displacing_large_files, s)) { | |
663 | print_sep(seq, &first); | |
664 | if (REISERFS_SB(s)->s_alloc_options.large_file_size != 16) { | |
665 | seq_printf(seq, "displacing_large_files=%lu", | |
666 | REISERFS_SB(s)->s_alloc_options.large_file_size); | |
667 | } else | |
668 | seq_puts(seq, "displacing_large_files"); | |
669 | } | |
670 | if (TEST_OPTION(displacing_new_packing_localities, s)) { | |
671 | print_sep(seq, &first); | |
672 | seq_puts(seq, "displacing_new_packing_localities"); | |
673 | } | |
674 | if (TEST_OPTION(old_hashed_relocation, s)) { | |
675 | print_sep(seq, &first); | |
676 | seq_puts(seq, "old_hashed_relocation"); | |
677 | } | |
678 | if (TEST_OPTION(new_hashed_relocation, s)) { | |
679 | print_sep(seq, &first); | |
680 | seq_puts(seq, "new_hashed_relocation"); | |
681 | } | |
682 | if (TEST_OPTION(dirid_groups, s)) { | |
683 | print_sep(seq, &first); | |
684 | seq_puts(seq, "dirid_groups"); | |
685 | } | |
686 | if (TEST_OPTION(oid_groups, s)) { | |
687 | print_sep(seq, &first); | |
688 | seq_puts(seq, "oid_groups"); | |
689 | } | |
690 | if (TEST_OPTION(packing_groups, s)) { | |
691 | print_sep(seq, &first); | |
692 | seq_puts(seq, "packing_groups"); | |
693 | } | |
694 | if (TEST_OPTION(hashed_formatted_nodes, s)) { | |
695 | print_sep(seq, &first); | |
696 | seq_puts(seq, "hashed_formatted_nodes"); | |
697 | } | |
698 | if (TEST_OPTION(skip_busy, s)) { | |
699 | print_sep(seq, &first); | |
700 | seq_puts(seq, "skip_busy"); | |
701 | } | |
702 | if (TEST_OPTION(hundredth_slices, s)) { | |
703 | print_sep(seq, &first); | |
704 | seq_puts(seq, "hundredth_slices"); | |
705 | } | |
706 | if (TEST_OPTION(old_way, s)) { | |
707 | print_sep(seq, &first); | |
708 | seq_puts(seq, "old_way"); | |
709 | } | |
710 | if (TEST_OPTION(displace_based_on_dirid, s)) { | |
711 | print_sep(seq, &first); | |
712 | seq_puts(seq, "displace_based_on_dirid"); | |
713 | } | |
714 | if (REISERFS_SB(s)->s_alloc_options.preallocmin != 0) { | |
715 | print_sep(seq, &first); | |
716 | seq_printf(seq, "preallocmin=%d", | |
717 | REISERFS_SB(s)->s_alloc_options.preallocmin); | |
718 | } | |
719 | if (REISERFS_SB(s)->s_alloc_options.preallocsize != 17) { | |
720 | print_sep(seq, &first); | |
721 | seq_printf(seq, "preallocsize=%d", | |
722 | REISERFS_SB(s)->s_alloc_options.preallocsize); | |
723 | } | |
724 | } | |
725 | ||
bd4c625c | 726 | static inline void new_hashed_relocation(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 727 | { |
bd4c625c LT |
728 | char *hash_in; |
729 | if (hint->formatted_node) { | |
730 | hash_in = (char *)&hint->key.k_dir_id; | |
731 | } else { | |
732 | if (!hint->inode) { | |
733 | //hint->search_start = hint->beg; | |
734 | hash_in = (char *)&hint->key.k_dir_id; | |
735 | } else | |
736 | if (TEST_OPTION(displace_based_on_dirid, hint->th->t_super)) | |
737 | hash_in = (char *)(&INODE_PKEY(hint->inode)->k_dir_id); | |
738 | else | |
739 | hash_in = | |
740 | (char *)(&INODE_PKEY(hint->inode)->k_objectid); | |
741 | } | |
1da177e4 | 742 | |
bd4c625c LT |
743 | hint->search_start = |
744 | hint->beg + keyed_hash(hash_in, 4) % (hint->end - hint->beg); | |
1da177e4 LT |
745 | } |
746 | ||
747 | /* | |
748 | * Relocation based on dirid, hashing them into a given bitmap block | |
c78bad11 | 749 | * files. Formatted nodes are unaffected, a separate policy covers them |
1da177e4 | 750 | */ |
bd4c625c | 751 | static void dirid_groups(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 752 | { |
bd4c625c LT |
753 | unsigned long hash; |
754 | __u32 dirid = 0; | |
755 | int bm = 0; | |
756 | struct super_block *sb = hint->th->t_super; | |
1da177e4 | 757 | if (hint->inode) |
bd4c625c LT |
758 | dirid = le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id); |
759 | else if (hint->formatted_node) | |
760 | dirid = hint->key.k_dir_id; | |
761 | ||
762 | if (dirid) { | |
763 | bm = bmap_hash_id(sb, dirid); | |
764 | hash = bm * (sb->s_blocksize << 3); | |
765 | /* give a portion of the block group to metadata */ | |
766 | if (hint->inode) | |
767 | hash += sb->s_blocksize / 2; | |
768 | hint->search_start = hash; | |
769 | } | |
1da177e4 LT |
770 | } |
771 | ||
772 | /* | |
773 | * Relocation based on oid, hashing them into a given bitmap block | |
c78bad11 | 774 | * files. Formatted nodes are unaffected, a separate policy covers them |
1da177e4 | 775 | */ |
bd4c625c | 776 | static void oid_groups(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 777 | { |
bd4c625c LT |
778 | if (hint->inode) { |
779 | unsigned long hash; | |
780 | __u32 oid; | |
781 | __u32 dirid; | |
782 | int bm; | |
783 | ||
784 | dirid = le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id); | |
785 | ||
786 | /* keep the root dir and it's first set of subdirs close to | |
787 | * the start of the disk | |
788 | */ | |
789 | if (dirid <= 2) | |
790 | hash = (hint->inode->i_sb->s_blocksize << 3); | |
791 | else { | |
792 | oid = le32_to_cpu(INODE_PKEY(hint->inode)->k_objectid); | |
793 | bm = bmap_hash_id(hint->inode->i_sb, oid); | |
794 | hash = bm * (hint->inode->i_sb->s_blocksize << 3); | |
795 | } | |
796 | hint->search_start = hash; | |
1da177e4 | 797 | } |
1da177e4 LT |
798 | } |
799 | ||
800 | /* returns 1 if it finds an indirect item and gets valid hint info | |
801 | * from it, otherwise 0 | |
802 | */ | |
bd4c625c | 803 | static int get_left_neighbor(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 804 | { |
fec6d055 | 805 | struct treepath *path; |
bd4c625c LT |
806 | struct buffer_head *bh; |
807 | struct item_head *ih; | |
808 | int pos_in_item; | |
809 | __le32 *item; | |
810 | int ret = 0; | |
811 | ||
812 | if (!hint->path) /* reiserfs code can call this function w/o pointer to path | |
1da177e4 | 813 | * structure supplied; then we rely on supplied search_start */ |
bd4c625c LT |
814 | return 0; |
815 | ||
816 | path = hint->path; | |
817 | bh = get_last_bh(path); | |
818 | RFALSE(!bh, "green-4002: Illegal path specified to get_left_neighbor"); | |
819 | ih = get_ih(path); | |
820 | pos_in_item = path->pos_in_item; | |
821 | item = get_item(path); | |
822 | ||
823 | hint->search_start = bh->b_blocknr; | |
824 | ||
825 | if (!hint->formatted_node && is_indirect_le_ih(ih)) { | |
826 | /* for indirect item: go to left and look for the first non-hole entry | |
827 | in the indirect item */ | |
828 | if (pos_in_item == I_UNFM_NUM(ih)) | |
829 | pos_in_item--; | |
830 | // pos_in_item = I_UNFM_NUM (ih) - 1; | |
831 | while (pos_in_item >= 0) { | |
832 | int t = get_block_num(item, pos_in_item); | |
833 | if (t) { | |
834 | hint->search_start = t; | |
835 | ret = 1; | |
836 | break; | |
837 | } | |
838 | pos_in_item--; | |
839 | } | |
1da177e4 | 840 | } |
1da177e4 | 841 | |
bd4c625c LT |
842 | /* does result value fit into specified region? */ |
843 | return ret; | |
1da177e4 LT |
844 | } |
845 | ||
846 | /* should be, if formatted node, then try to put on first part of the device | |
847 | specified as number of percent with mount option device, else try to put | |
848 | on last of device. This is not to say it is good code to do so, | |
849 | but the effect should be measured. */ | |
bd4c625c LT |
850 | static inline void set_border_in_hint(struct super_block *s, |
851 | reiserfs_blocknr_hint_t * hint) | |
1da177e4 | 852 | { |
bd4c625c LT |
853 | b_blocknr_t border = |
854 | SB_BLOCK_COUNT(s) / REISERFS_SB(s)->s_alloc_options.border; | |
1da177e4 | 855 | |
bd4c625c LT |
856 | if (hint->formatted_node) |
857 | hint->end = border - 1; | |
858 | else | |
859 | hint->beg = border; | |
1da177e4 LT |
860 | } |
861 | ||
bd4c625c | 862 | static inline void displace_large_file(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 863 | { |
bd4c625c LT |
864 | if (TEST_OPTION(displace_based_on_dirid, hint->th->t_super)) |
865 | hint->search_start = | |
866 | hint->beg + | |
867 | keyed_hash((char *)(&INODE_PKEY(hint->inode)->k_dir_id), | |
868 | 4) % (hint->end - hint->beg); | |
869 | else | |
870 | hint->search_start = | |
871 | hint->beg + | |
872 | keyed_hash((char *)(&INODE_PKEY(hint->inode)->k_objectid), | |
873 | 4) % (hint->end - hint->beg); | |
1da177e4 LT |
874 | } |
875 | ||
bd4c625c | 876 | static inline void hash_formatted_node(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 877 | { |
bd4c625c | 878 | char *hash_in; |
1da177e4 | 879 | |
bd4c625c LT |
880 | if (!hint->inode) |
881 | hash_in = (char *)&hint->key.k_dir_id; | |
882 | else if (TEST_OPTION(displace_based_on_dirid, hint->th->t_super)) | |
883 | hash_in = (char *)(&INODE_PKEY(hint->inode)->k_dir_id); | |
884 | else | |
885 | hash_in = (char *)(&INODE_PKEY(hint->inode)->k_objectid); | |
1da177e4 | 886 | |
bd4c625c LT |
887 | hint->search_start = |
888 | hint->beg + keyed_hash(hash_in, 4) % (hint->end - hint->beg); | |
1da177e4 LT |
889 | } |
890 | ||
bd4c625c LT |
891 | static inline int |
892 | this_blocknr_allocation_would_make_it_a_large_file(reiserfs_blocknr_hint_t * | |
893 | hint) | |
1da177e4 | 894 | { |
bd4c625c LT |
895 | return hint->block == |
896 | REISERFS_SB(hint->th->t_super)->s_alloc_options.large_file_size; | |
1da177e4 LT |
897 | } |
898 | ||
899 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES | |
bd4c625c | 900 | static inline void displace_new_packing_locality(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 901 | { |
bd4c625c | 902 | struct in_core_key *key = &hint->key; |
1da177e4 | 903 | |
bd4c625c LT |
904 | hint->th->displace_new_blocks = 0; |
905 | hint->search_start = | |
906 | hint->beg + keyed_hash((char *)(&key->k_objectid), | |
907 | 4) % (hint->end - hint->beg); | |
1da177e4 | 908 | } |
bd4c625c | 909 | #endif |
1da177e4 | 910 | |
bd4c625c | 911 | static inline int old_hashed_relocation(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 912 | { |
bd4c625c LT |
913 | b_blocknr_t border; |
914 | u32 hash_in; | |
1da177e4 | 915 | |
bd4c625c LT |
916 | if (hint->formatted_node || hint->inode == NULL) { |
917 | return 0; | |
918 | } | |
1da177e4 | 919 | |
bd4c625c LT |
920 | hash_in = le32_to_cpu((INODE_PKEY(hint->inode))->k_dir_id); |
921 | border = | |
922 | hint->beg + (u32) keyed_hash(((char *)(&hash_in)), | |
923 | 4) % (hint->end - hint->beg - 1); | |
924 | if (border > hint->search_start) | |
925 | hint->search_start = border; | |
1da177e4 | 926 | |
bd4c625c | 927 | return 1; |
1da177e4 LT |
928 | } |
929 | ||
bd4c625c | 930 | static inline int old_way(reiserfs_blocknr_hint_t * hint) |
1da177e4 | 931 | { |
bd4c625c LT |
932 | b_blocknr_t border; |
933 | ||
934 | if (hint->formatted_node || hint->inode == NULL) { | |
935 | return 0; | |
936 | } | |
937 | ||
938 | border = | |
939 | hint->beg + | |
940 | le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id) % (hint->end - | |
941 | hint->beg); | |
942 | if (border > hint->search_start) | |
943 | hint->search_start = border; | |
1da177e4 | 944 | |
bd4c625c LT |
945 | return 1; |
946 | } | |
947 | ||
948 | static inline void hundredth_slices(reiserfs_blocknr_hint_t * hint) | |
949 | { | |
950 | struct in_core_key *key = &hint->key; | |
951 | b_blocknr_t slice_start; | |
952 | ||
953 | slice_start = | |
954 | (keyed_hash((char *)(&key->k_dir_id), 4) % 100) * (hint->end / 100); | |
955 | if (slice_start > hint->search_start | |
956 | || slice_start + (hint->end / 100) <= hint->search_start) { | |
957 | hint->search_start = slice_start; | |
958 | } | |
1da177e4 | 959 | } |
bd4c625c LT |
960 | |
961 | static void determine_search_start(reiserfs_blocknr_hint_t * hint, | |
962 | int amount_needed) | |
1da177e4 | 963 | { |
bd4c625c LT |
964 | struct super_block *s = hint->th->t_super; |
965 | int unfm_hint; | |
1da177e4 | 966 | |
bd4c625c LT |
967 | hint->beg = 0; |
968 | hint->end = SB_BLOCK_COUNT(s) - 1; | |
1da177e4 | 969 | |
bd4c625c LT |
970 | /* This is former border algorithm. Now with tunable border offset */ |
971 | if (concentrating_formatted_nodes(s)) | |
972 | set_border_in_hint(s, hint); | |
1da177e4 LT |
973 | |
974 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES | |
bd4c625c LT |
975 | /* whenever we create a new directory, we displace it. At first we will |
976 | hash for location, later we might look for a moderately empty place for | |
977 | it */ | |
978 | if (displacing_new_packing_localities(s) | |
979 | && hint->th->displace_new_blocks) { | |
980 | displace_new_packing_locality(hint); | |
981 | ||
982 | /* we do not continue determine_search_start, | |
983 | * if new packing locality is being displaced */ | |
984 | return; | |
985 | } | |
1da177e4 | 986 | #endif |
1da177e4 | 987 | |
bd4c625c LT |
988 | /* all persons should feel encouraged to add more special cases here and |
989 | * test them */ | |
1da177e4 | 990 | |
bd4c625c LT |
991 | if (displacing_large_files(s) && !hint->formatted_node |
992 | && this_blocknr_allocation_would_make_it_a_large_file(hint)) { | |
993 | displace_large_file(hint); | |
994 | return; | |
995 | } | |
1da177e4 | 996 | |
bd4c625c LT |
997 | /* if none of our special cases is relevant, use the left neighbor in the |
998 | tree order of the new node we are allocating for */ | |
999 | if (hint->formatted_node && TEST_OPTION(hashed_formatted_nodes, s)) { | |
1000 | hash_formatted_node(hint); | |
1001 | return; | |
1002 | } | |
1da177e4 | 1003 | |
bd4c625c LT |
1004 | unfm_hint = get_left_neighbor(hint); |
1005 | ||
1006 | /* Mimic old block allocator behaviour, that is if VFS allowed for preallocation, | |
1007 | new blocks are displaced based on directory ID. Also, if suggested search_start | |
1008 | is less than last preallocated block, we start searching from it, assuming that | |
1009 | HDD dataflow is faster in forward direction */ | |
1010 | if (TEST_OPTION(old_way, s)) { | |
1011 | if (!hint->formatted_node) { | |
1012 | if (!reiserfs_hashed_relocation(s)) | |
1013 | old_way(hint); | |
1014 | else if (!reiserfs_no_unhashed_relocation(s)) | |
1015 | old_hashed_relocation(hint); | |
1016 | ||
1017 | if (hint->inode | |
1018 | && hint->search_start < | |
1019 | REISERFS_I(hint->inode)->i_prealloc_block) | |
1020 | hint->search_start = | |
1021 | REISERFS_I(hint->inode)->i_prealloc_block; | |
1022 | } | |
1023 | return; | |
1da177e4 | 1024 | } |
1da177e4 | 1025 | |
bd4c625c LT |
1026 | /* This is an approach proposed by Hans */ |
1027 | if (TEST_OPTION(hundredth_slices, s) | |
1028 | && !(displacing_large_files(s) && !hint->formatted_node)) { | |
1029 | hundredth_slices(hint); | |
1030 | return; | |
1031 | } | |
1da177e4 | 1032 | |
bd4c625c LT |
1033 | /* old_hashed_relocation only works on unformatted */ |
1034 | if (!unfm_hint && !hint->formatted_node && | |
1035 | TEST_OPTION(old_hashed_relocation, s)) { | |
1036 | old_hashed_relocation(hint); | |
1037 | } | |
1038 | /* new_hashed_relocation works with both formatted/unformatted nodes */ | |
1039 | if ((!unfm_hint || hint->formatted_node) && | |
1040 | TEST_OPTION(new_hashed_relocation, s)) { | |
1041 | new_hashed_relocation(hint); | |
1042 | } | |
1043 | /* dirid grouping works only on unformatted nodes */ | |
1044 | if (!unfm_hint && !hint->formatted_node && TEST_OPTION(dirid_groups, s)) { | |
1045 | dirid_groups(hint); | |
1046 | } | |
1da177e4 | 1047 | #ifdef DISPLACE_NEW_PACKING_LOCALITIES |
bd4c625c LT |
1048 | if (hint->formatted_node && TEST_OPTION(dirid_groups, s)) { |
1049 | dirid_groups(hint); | |
1050 | } | |
1da177e4 LT |
1051 | #endif |
1052 | ||
bd4c625c LT |
1053 | /* oid grouping works only on unformatted nodes */ |
1054 | if (!unfm_hint && !hint->formatted_node && TEST_OPTION(oid_groups, s)) { | |
1055 | oid_groups(hint); | |
1056 | } | |
1057 | return; | |
1da177e4 LT |
1058 | } |
1059 | ||
1060 | static int determine_prealloc_size(reiserfs_blocknr_hint_t * hint) | |
1061 | { | |
bd4c625c LT |
1062 | /* make minimum size a mount option and benchmark both ways */ |
1063 | /* we preallocate blocks only for regular files, specific size */ | |
1064 | /* benchmark preallocating always and see what happens */ | |
1065 | ||
1066 | hint->prealloc_size = 0; | |
1067 | ||
1068 | if (!hint->formatted_node && hint->preallocate) { | |
1069 | if (S_ISREG(hint->inode->i_mode) | |
1070 | && hint->inode->i_size >= | |
1071 | REISERFS_SB(hint->th->t_super)->s_alloc_options. | |
1072 | preallocmin * hint->inode->i_sb->s_blocksize) | |
1073 | hint->prealloc_size = | |
1074 | REISERFS_SB(hint->th->t_super)->s_alloc_options. | |
1075 | preallocsize - 1; | |
1076 | } | |
1077 | return CARRY_ON; | |
1da177e4 LT |
1078 | } |
1079 | ||
1080 | /* XXX I know it could be merged with upper-level function; | |
1081 | but may be result function would be too complex. */ | |
bd4c625c LT |
1082 | static inline int allocate_without_wrapping_disk(reiserfs_blocknr_hint_t * hint, |
1083 | b_blocknr_t * new_blocknrs, | |
1084 | b_blocknr_t start, | |
1085 | b_blocknr_t finish, int min, | |
1086 | int amount_needed, | |
1087 | int prealloc_size) | |
1da177e4 | 1088 | { |
bd4c625c LT |
1089 | int rest = amount_needed; |
1090 | int nr_allocated; | |
1091 | ||
1092 | while (rest > 0 && start <= finish) { | |
1093 | nr_allocated = scan_bitmap(hint->th, &start, finish, min, | |
1094 | rest + prealloc_size, | |
1095 | !hint->formatted_node, hint->block); | |
1096 | ||
1097 | if (nr_allocated == 0) /* no new blocks allocated, return */ | |
1098 | break; | |
1099 | ||
1100 | /* fill free_blocknrs array first */ | |
1101 | while (rest > 0 && nr_allocated > 0) { | |
1102 | *new_blocknrs++ = start++; | |
1103 | rest--; | |
1104 | nr_allocated--; | |
1105 | } | |
1da177e4 | 1106 | |
bd4c625c LT |
1107 | /* do we have something to fill prealloc. array also ? */ |
1108 | if (nr_allocated > 0) { | |
1109 | /* it means prealloc_size was greater that 0 and we do preallocation */ | |
1110 | list_add(&REISERFS_I(hint->inode)->i_prealloc_list, | |
1111 | &SB_JOURNAL(hint->th->t_super)-> | |
1112 | j_prealloc_list); | |
1113 | REISERFS_I(hint->inode)->i_prealloc_block = start; | |
1114 | REISERFS_I(hint->inode)->i_prealloc_count = | |
1115 | nr_allocated; | |
1116 | break; | |
1117 | } | |
1da177e4 | 1118 | } |
1da177e4 | 1119 | |
bd4c625c | 1120 | return (amount_needed - rest); |
1da177e4 LT |
1121 | } |
1122 | ||
1123 | static inline int blocknrs_and_prealloc_arrays_from_search_start | |
bd4c625c LT |
1124 | (reiserfs_blocknr_hint_t * hint, b_blocknr_t * new_blocknrs, |
1125 | int amount_needed) { | |
1126 | struct super_block *s = hint->th->t_super; | |
1127 | b_blocknr_t start = hint->search_start; | |
1128 | b_blocknr_t finish = SB_BLOCK_COUNT(s) - 1; | |
1129 | int passno = 0; | |
1130 | int nr_allocated = 0; | |
bd4c625c LT |
1131 | |
1132 | determine_prealloc_size(hint); | |
1133 | if (!hint->formatted_node) { | |
1134 | int quota_ret; | |
1da177e4 | 1135 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1136 | reiserfs_debug(s, REISERFS_DEBUG_CODE, |
1137 | "reiserquota: allocating %d blocks id=%u", | |
1138 | amount_needed, hint->inode->i_uid); | |
1da177e4 | 1139 | #endif |
bd4c625c | 1140 | quota_ret = |
5dd4056d | 1141 | dquot_alloc_block_nodirty(hint->inode, amount_needed); |
bd4c625c LT |
1142 | if (quota_ret) /* Quota exceeded? */ |
1143 | return QUOTA_EXCEEDED; | |
1144 | if (hint->preallocate && hint->prealloc_size) { | |
1da177e4 | 1145 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1146 | reiserfs_debug(s, REISERFS_DEBUG_CODE, |
1147 | "reiserquota: allocating (prealloc) %d blocks id=%u", | |
1148 | hint->prealloc_size, hint->inode->i_uid); | |
1da177e4 | 1149 | #endif |
5dd4056d | 1150 | quota_ret = dquot_prealloc_block_nodirty(hint->inode, |
bd4c625c LT |
1151 | hint->prealloc_size); |
1152 | if (quota_ret) | |
1153 | hint->preallocate = hint->prealloc_size = 0; | |
1154 | } | |
1155 | /* for unformatted nodes, force large allocations */ | |
1da177e4 | 1156 | } |
1da177e4 | 1157 | |
bd4c625c | 1158 | do { |
bd4c625c LT |
1159 | switch (passno++) { |
1160 | case 0: /* Search from hint->search_start to end of disk */ | |
1161 | start = hint->search_start; | |
1162 | finish = SB_BLOCK_COUNT(s) - 1; | |
1163 | break; | |
1164 | case 1: /* Search from hint->beg to hint->search_start */ | |
1165 | start = hint->beg; | |
1166 | finish = hint->search_start; | |
1167 | break; | |
1168 | case 2: /* Last chance: Search from 0 to hint->beg */ | |
1169 | start = 0; | |
1170 | finish = hint->beg; | |
1171 | break; | |
1172 | default: /* We've tried searching everywhere, not enough space */ | |
1173 | /* Free the blocks */ | |
1174 | if (!hint->formatted_node) { | |
1da177e4 | 1175 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1176 | reiserfs_debug(s, REISERFS_DEBUG_CODE, |
1177 | "reiserquota: freeing (nospace) %d blocks id=%u", | |
1178 | amount_needed + | |
1179 | hint->prealloc_size - | |
1180 | nr_allocated, | |
1181 | hint->inode->i_uid); | |
1da177e4 | 1182 | #endif |
77db4f25 | 1183 | /* Free not allocated blocks */ |
5dd4056d | 1184 | dquot_free_block_nodirty(hint->inode, |
77db4f25 JK |
1185 | amount_needed + hint->prealloc_size - |
1186 | nr_allocated); | |
bd4c625c LT |
1187 | } |
1188 | while (nr_allocated--) | |
1189 | reiserfs_free_block(hint->th, hint->inode, | |
1190 | new_blocknrs[nr_allocated], | |
1191 | !hint->formatted_node); | |
1192 | ||
1193 | return NO_DISK_SPACE; | |
1194 | } | |
1195 | } while ((nr_allocated += allocate_without_wrapping_disk(hint, | |
1196 | new_blocknrs + | |
1197 | nr_allocated, | |
1198 | start, finish, | |
9ea0f949 | 1199 | 1, |
bd4c625c LT |
1200 | amount_needed - |
1201 | nr_allocated, | |
1202 | hint-> | |
1203 | prealloc_size)) | |
1204 | < amount_needed); | |
1205 | if (!hint->formatted_node && | |
1206 | amount_needed + hint->prealloc_size > | |
1207 | nr_allocated + REISERFS_I(hint->inode)->i_prealloc_count) { | |
1208 | /* Some of preallocation blocks were not allocated */ | |
1da177e4 | 1209 | #ifdef REISERQUOTA_DEBUG |
bd4c625c LT |
1210 | reiserfs_debug(s, REISERFS_DEBUG_CODE, |
1211 | "reiserquota: freeing (failed prealloc) %d blocks id=%u", | |
1212 | amount_needed + hint->prealloc_size - | |
1213 | nr_allocated - | |
1214 | REISERFS_I(hint->inode)->i_prealloc_count, | |
1215 | hint->inode->i_uid); | |
1da177e4 | 1216 | #endif |
5dd4056d | 1217 | dquot_free_block_nodirty(hint->inode, amount_needed + |
bd4c625c LT |
1218 | hint->prealloc_size - nr_allocated - |
1219 | REISERFS_I(hint->inode)-> | |
1220 | i_prealloc_count); | |
1221 | } | |
1da177e4 | 1222 | |
bd4c625c | 1223 | return CARRY_ON; |
1da177e4 LT |
1224 | } |
1225 | ||
1226 | /* grab new blocknrs from preallocated list */ | |
1227 | /* return amount still needed after using them */ | |
bd4c625c LT |
1228 | static int use_preallocated_list_if_available(reiserfs_blocknr_hint_t * hint, |
1229 | b_blocknr_t * new_blocknrs, | |
1230 | int amount_needed) | |
1da177e4 | 1231 | { |
bd4c625c | 1232 | struct inode *inode = hint->inode; |
1da177e4 | 1233 | |
bd4c625c LT |
1234 | if (REISERFS_I(inode)->i_prealloc_count > 0) { |
1235 | while (amount_needed) { | |
1da177e4 | 1236 | |
bd4c625c LT |
1237 | *new_blocknrs++ = REISERFS_I(inode)->i_prealloc_block++; |
1238 | REISERFS_I(inode)->i_prealloc_count--; | |
1da177e4 | 1239 | |
bd4c625c | 1240 | amount_needed--; |
1da177e4 | 1241 | |
bd4c625c LT |
1242 | if (REISERFS_I(inode)->i_prealloc_count <= 0) { |
1243 | list_del(&REISERFS_I(inode)->i_prealloc_list); | |
1244 | break; | |
1245 | } | |
1246 | } | |
1da177e4 | 1247 | } |
bd4c625c LT |
1248 | /* return amount still needed after using preallocated blocks */ |
1249 | return amount_needed; | |
1da177e4 LT |
1250 | } |
1251 | ||
bd4c625c LT |
1252 | int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t * hint, b_blocknr_t * new_blocknrs, int amount_needed, int reserved_by_us /* Amount of blocks we have |
1253 | already reserved */ ) | |
1da177e4 | 1254 | { |
bd4c625c LT |
1255 | int initial_amount_needed = amount_needed; |
1256 | int ret; | |
1257 | struct super_block *s = hint->th->t_super; | |
1258 | ||
1259 | /* Check if there is enough space, taking into account reserved space */ | |
1260 | if (SB_FREE_BLOCKS(s) - REISERFS_SB(s)->reserved_blocks < | |
1261 | amount_needed - reserved_by_us) | |
1262 | return NO_DISK_SPACE; | |
1263 | /* should this be if !hint->inode && hint->preallocate? */ | |
1264 | /* do you mean hint->formatted_node can be removed ? - Zam */ | |
1265 | /* hint->formatted_node cannot be removed because we try to access | |
1266 | inode information here, and there is often no inode assotiated with | |
1267 | metadata allocations - green */ | |
1268 | ||
1269 | if (!hint->formatted_node && hint->preallocate) { | |
1270 | amount_needed = use_preallocated_list_if_available | |
1271 | (hint, new_blocknrs, amount_needed); | |
1272 | if (amount_needed == 0) /* all blocknrs we need we got from | |
1273 | prealloc. list */ | |
1274 | return CARRY_ON; | |
1275 | new_blocknrs += (initial_amount_needed - amount_needed); | |
1276 | } | |
1277 | ||
1278 | /* find search start and save it in hint structure */ | |
1279 | determine_search_start(hint, amount_needed); | |
1280 | if (hint->search_start >= SB_BLOCK_COUNT(s)) | |
1281 | hint->search_start = SB_BLOCK_COUNT(s) - 1; | |
1282 | ||
1283 | /* allocation itself; fill new_blocknrs and preallocation arrays */ | |
1284 | ret = blocknrs_and_prealloc_arrays_from_search_start | |
1da177e4 | 1285 | (hint, new_blocknrs, amount_needed); |
bd4c625c LT |
1286 | |
1287 | /* we used prealloc. list to fill (partially) new_blocknrs array. If final allocation fails we | |
1288 | * need to return blocks back to prealloc. list or just free them. -- Zam (I chose second | |
1289 | * variant) */ | |
1290 | ||
1291 | if (ret != CARRY_ON) { | |
1292 | while (amount_needed++ < initial_amount_needed) { | |
1293 | reiserfs_free_block(hint->th, hint->inode, | |
1294 | *(--new_blocknrs), 1); | |
1295 | } | |
1da177e4 | 1296 | } |
bd4c625c | 1297 | return ret; |
1da177e4 LT |
1298 | } |
1299 | ||
6f01046b JM |
1300 | void reiserfs_cache_bitmap_metadata(struct super_block *sb, |
1301 | struct buffer_head *bh, | |
1302 | struct reiserfs_bitmap_info *info) | |
1303 | { | |
1304 | unsigned long *cur = (unsigned long *)(bh->b_data + bh->b_size); | |
1305 | ||
4d20851d | 1306 | /* The first bit must ALWAYS be 1 */ |
0030b645 JM |
1307 | if (!reiserfs_test_le_bit(0, (unsigned long *)bh->b_data)) |
1308 | reiserfs_error(sb, "reiserfs-2025", "bitmap block %lu is " | |
1309 | "corrupted: first bit must be 1", bh->b_blocknr); | |
4d20851d JM |
1310 | |
1311 | info->free_count = 0; | |
6f01046b JM |
1312 | |
1313 | while (--cur >= (unsigned long *)bh->b_data) { | |
6f01046b | 1314 | /* 0 and ~0 are special, we can optimize for them */ |
4d20851d | 1315 | if (*cur == 0) |
6f01046b | 1316 | info->free_count += BITS_PER_LONG; |
4d20851d | 1317 | else if (*cur != ~0L) /* A mix, investigate */ |
9d6bf5aa | 1318 | info->free_count += BITS_PER_LONG - hweight_long(*cur); |
6f01046b | 1319 | } |
6f01046b JM |
1320 | } |
1321 | ||
1322 | struct buffer_head *reiserfs_read_bitmap_block(struct super_block *sb, | |
1323 | unsigned int bitmap) | |
1324 | { | |
1325 | b_blocknr_t block = (sb->s_blocksize << 3) * bitmap; | |
5065227b | 1326 | struct reiserfs_bitmap_info *info = SB_AP_BITMAP(sb) + bitmap; |
6f01046b JM |
1327 | struct buffer_head *bh; |
1328 | ||
1329 | /* Way old format filesystems had the bitmaps packed up front. | |
1330 | * I doubt there are any of these left, but just in case... */ | |
1331 | if (unlikely(test_bit(REISERFS_OLD_FORMAT, | |
1332 | &(REISERFS_SB(sb)->s_properties)))) | |
1333 | block = REISERFS_SB(sb)->s_sbh->b_blocknr + 1 + bitmap; | |
1334 | else if (bitmap == 0) | |
1335 | block = (REISERFS_DISK_OFFSET_IN_BYTES >> sb->s_blocksize_bits) + 1; | |
1336 | ||
5065227b JM |
1337 | bh = sb_bread(sb, block); |
1338 | if (bh == NULL) | |
00079e04 | 1339 | reiserfs_warning(sb, "sh-2029: %s: bitmap block (#%u) " |
fbe5498b | 1340 | "reading failed", __func__, block); |
5065227b JM |
1341 | else { |
1342 | if (buffer_locked(bh)) { | |
1343 | PROC_INFO_INC(sb, scan_bitmap.wait); | |
8ebc4232 | 1344 | reiserfs_write_unlock(sb); |
5065227b | 1345 | __wait_on_buffer(bh); |
8ebc4232 | 1346 | reiserfs_write_lock(sb); |
5065227b JM |
1347 | } |
1348 | BUG_ON(!buffer_uptodate(bh)); | |
1349 | BUG_ON(atomic_read(&bh->b_count) == 0); | |
1350 | ||
4d20851d | 1351 | if (info->free_count == UINT_MAX) |
5065227b JM |
1352 | reiserfs_cache_bitmap_metadata(sb, bh, info); |
1353 | } | |
6f01046b JM |
1354 | |
1355 | return bh; | |
1356 | } | |
1357 | ||
1358 | int reiserfs_init_bitmap_cache(struct super_block *sb) | |
1359 | { | |
1360 | struct reiserfs_bitmap_info *bitmap; | |
cb680c1b | 1361 | unsigned int bmap_nr = reiserfs_bmap_count(sb); |
6f01046b | 1362 | |
cb680c1b | 1363 | bitmap = vmalloc(sizeof(*bitmap) * bmap_nr); |
6f01046b JM |
1364 | if (bitmap == NULL) |
1365 | return -ENOMEM; | |
1366 | ||
cb680c1b | 1367 | memset(bitmap, 0xff, sizeof(*bitmap) * bmap_nr); |
6f01046b | 1368 | |
6f01046b JM |
1369 | SB_AP_BITMAP(sb) = bitmap; |
1370 | ||
1371 | return 0; | |
1372 | } | |
5065227b JM |
1373 | |
1374 | void reiserfs_free_bitmap_cache(struct super_block *sb) | |
1375 | { | |
1376 | if (SB_AP_BITMAP(sb)) { | |
1377 | vfree(SB_AP_BITMAP(sb)); | |
1378 | SB_AP_BITMAP(sb) = NULL; | |
1379 | } | |
1380 | } |