Blame view
fs/nilfs2/alloc.c
21.2 KB
5442680fd
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 |
/* * alloc.c - NILFS dat/inode allocator * * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * Original code was written by Koji Sato <koji@osrg.net>. * Two allocators were unified by Ryusuke Konishi <ryusuke@osrg.net>, * Amagai Yoshiji <amagai@osrg.net>. */ #include <linux/types.h> #include <linux/buffer_head.h> #include <linux/fs.h> #include <linux/bitops.h> |
5a0e3ad6a
|
29 |
#include <linux/slab.h> |
5442680fd
|
30 31 |
#include "mdt.h" #include "alloc.h" |
db55d9225
|
32 33 34 35 36 |
/** * nilfs_palloc_groups_per_desc_block - get the number of groups that a group * descriptor block can maintain * @inode: inode of metadata file using this allocator */ |
5442680fd
|
37 38 39 40 41 42 |
static inline unsigned long nilfs_palloc_groups_per_desc_block(const struct inode *inode) { return (1UL << inode->i_blkbits) / sizeof(struct nilfs_palloc_group_desc); } |
db55d9225
|
43 44 45 46 |
/** * nilfs_palloc_groups_count - get maximum number of groups * @inode: inode of metadata file using this allocator */ |
5442680fd
|
47 48 49 50 51 |
static inline unsigned long nilfs_palloc_groups_count(const struct inode *inode) { return 1UL << (BITS_PER_LONG - (inode->i_blkbits + 3 /* log2(8) */)); } |
db55d9225
|
52 53 54 55 56 |
/** * nilfs_palloc_init_blockgroup - initialize private variables for allocator * @inode: inode of metadata file using this allocator * @entry_size: size of the persistent object */ |
5442680fd
|
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 |
int nilfs_palloc_init_blockgroup(struct inode *inode, unsigned entry_size) { struct nilfs_mdt_info *mi = NILFS_MDT(inode); mi->mi_bgl = kmalloc(sizeof(*mi->mi_bgl), GFP_NOFS); if (!mi->mi_bgl) return -ENOMEM; bgl_lock_init(mi->mi_bgl); nilfs_mdt_set_entry_size(inode, entry_size, 0); mi->mi_blocks_per_group = DIV_ROUND_UP(nilfs_palloc_entries_per_group(inode), mi->mi_entries_per_block) + 1; /* Number of blocks in a group including entry blocks and a bitmap block */ mi->mi_blocks_per_desc_block = nilfs_palloc_groups_per_desc_block(inode) * mi->mi_blocks_per_group + 1; /* Number of blocks per descriptor including the descriptor block */ return 0; } |
db55d9225
|
81 82 83 84 85 86 |
/** * nilfs_palloc_group - get group number and offset from an entry number * @inode: inode of metadata file using this allocator * @nr: serial number of the entry (e.g. inode number) * @offset: pointer to store offset number in the group */ |
5442680fd
|
87 88 89 90 91 92 93 94 |
static unsigned long nilfs_palloc_group(const struct inode *inode, __u64 nr, unsigned long *offset) { __u64 group = nr; *offset = do_div(group, nilfs_palloc_entries_per_group(inode)); return group; } |
db55d9225
|
95 96 97 98 99 100 101 102 |
/** * nilfs_palloc_desc_blkoff - get block offset of a group descriptor block * @inode: inode of metadata file using this allocator * @group: group number * * nilfs_palloc_desc_blkoff() returns block offset of the descriptor * block which contains a descriptor of the specified group. */ |
5442680fd
|
103 104 105 106 107 108 109 |
static unsigned long nilfs_palloc_desc_blkoff(const struct inode *inode, unsigned long group) { unsigned long desc_block = group / nilfs_palloc_groups_per_desc_block(inode); return desc_block * NILFS_MDT(inode)->mi_blocks_per_desc_block; } |
db55d9225
|
110 111 112 113 114 115 116 117 |
/** * nilfs_palloc_bitmap_blkoff - get block offset of a bitmap block * @inode: inode of metadata file using this allocator * @group: group number * * nilfs_palloc_bitmap_blkoff() returns block offset of the bitmap * block used to allocate/deallocate entries in the specified group. */ |
5442680fd
|
118 119 120 121 122 123 124 125 |
static unsigned long nilfs_palloc_bitmap_blkoff(const struct inode *inode, unsigned long group) { unsigned long desc_offset = group % nilfs_palloc_groups_per_desc_block(inode); return nilfs_palloc_desc_blkoff(inode, group) + 1 + desc_offset * NILFS_MDT(inode)->mi_blocks_per_group; } |
db55d9225
|
126 127 128 129 130 131 |
/** * nilfs_palloc_group_desc_nfrees - get the number of free entries in a group * @inode: inode of metadata file using this allocator * @group: group number * @desc: pointer to descriptor structure for the group */ |
5442680fd
|
132 133 134 135 136 137 138 139 140 141 142 |
static unsigned long nilfs_palloc_group_desc_nfrees(struct inode *inode, unsigned long group, const struct nilfs_palloc_group_desc *desc) { unsigned long nfree; spin_lock(nilfs_mdt_bgl_lock(inode, group)); nfree = le32_to_cpu(desc->pg_nfrees); spin_unlock(nilfs_mdt_bgl_lock(inode, group)); return nfree; } |
db55d9225
|
143 144 145 146 147 148 149 |
/** * nilfs_palloc_group_desc_add_entries - adjust count of free entries * @inode: inode of metadata file using this allocator * @group: group number * @desc: pointer to descriptor structure for the group * @n: delta to be added */ |
5442680fd
|
150 151 152 153 154 155 156 157 158 159 |
static void nilfs_palloc_group_desc_add_entries(struct inode *inode, unsigned long group, struct nilfs_palloc_group_desc *desc, u32 n) { spin_lock(nilfs_mdt_bgl_lock(inode, group)); le32_add_cpu(&desc->pg_nfrees, n); spin_unlock(nilfs_mdt_bgl_lock(inode, group)); } |
db55d9225
|
160 161 162 163 164 |
/** * nilfs_palloc_entry_blkoff - get block offset of an entry block * @inode: inode of metadata file using this allocator * @nr: serial number of the entry (e.g. inode number) */ |
5442680fd
|
165 166 167 168 169 170 171 172 173 174 |
static unsigned long nilfs_palloc_entry_blkoff(const struct inode *inode, __u64 nr) { unsigned long group, group_offset; group = nilfs_palloc_group(inode, nr, &group_offset); return nilfs_palloc_bitmap_blkoff(inode, group) + 1 + group_offset / NILFS_MDT(inode)->mi_entries_per_block; } |
db55d9225
|
175 176 177 178 179 180 |
/** * nilfs_palloc_desc_block_init - initialize buffer of a group descriptor block * @inode: inode of metadata file * @bh: buffer head of the buffer to be initialized * @kaddr: kernel address mapped for the page including the buffer */ |
5442680fd
|
181 182 183 184 185 186 187 188 189 190 191 192 193 |
static void nilfs_palloc_desc_block_init(struct inode *inode, struct buffer_head *bh, void *kaddr) { struct nilfs_palloc_group_desc *desc = kaddr + bh_offset(bh); unsigned long n = nilfs_palloc_groups_per_desc_block(inode); __le32 nfrees; nfrees = cpu_to_le32(nilfs_palloc_entries_per_group(inode)); while (n-- > 0) { desc->pg_nfrees = nfrees; desc++; } } |
70622a209
|
194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 |
static int nilfs_palloc_get_block(struct inode *inode, unsigned long blkoff, int create, void (*init_block)(struct inode *, struct buffer_head *, void *), struct buffer_head **bhp, struct nilfs_bh_assoc *prev, spinlock_t *lock) { int ret; spin_lock(lock); if (prev->bh && blkoff == prev->blkoff) { get_bh(prev->bh); *bhp = prev->bh; spin_unlock(lock); return 0; } spin_unlock(lock); ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp); if (!ret) { spin_lock(lock); /* * The following code must be safe for change of the * cache contents during the get block call. */ brelse(prev->bh); get_bh(*bhp); prev->bh = *bhp; prev->blkoff = blkoff; spin_unlock(lock); } return ret; } |
db55d9225
|
229 230 231 232 233 234 235 |
/** * nilfs_palloc_get_desc_block - get buffer head of a group descriptor block * @inode: inode of metadata file using this allocator * @group: group number * @create: create flag * @bhp: pointer to store the resultant buffer head */ |
5442680fd
|
236 237 238 239 |
static int nilfs_palloc_get_desc_block(struct inode *inode, unsigned long group, int create, struct buffer_head **bhp) { |
70622a209
|
240 241 242 243 244 245 |
struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; return nilfs_palloc_get_block(inode, nilfs_palloc_desc_blkoff(inode, group), create, nilfs_palloc_desc_block_init, bhp, &cache->prev_desc, &cache->lock); |
5442680fd
|
246 |
} |
db55d9225
|
247 248 249 250 251 252 253 |
/** * nilfs_palloc_get_bitmap_block - get buffer head of a bitmap block * @inode: inode of metadata file using this allocator * @group: group number * @create: create flag * @bhp: pointer to store the resultant buffer head */ |
5442680fd
|
254 255 256 257 |
static int nilfs_palloc_get_bitmap_block(struct inode *inode, unsigned long group, int create, struct buffer_head **bhp) { |
70622a209
|
258 259 260 261 262 263 |
struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; return nilfs_palloc_get_block(inode, nilfs_palloc_bitmap_blkoff(inode, group), create, NULL, bhp, &cache->prev_bitmap, &cache->lock); |
5442680fd
|
264 |
} |
db55d9225
|
265 266 267 268 269 270 271 |
/** * nilfs_palloc_get_entry_block - get buffer head of an entry block * @inode: inode of metadata file using this allocator * @nr: serial number of the entry (e.g. inode number) * @create: create flag * @bhp: pointer to store the resultant buffer head */ |
5442680fd
|
272 273 274 |
int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr, int create, struct buffer_head **bhp) { |
70622a209
|
275 276 277 278 279 280 |
struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; return nilfs_palloc_get_block(inode, nilfs_palloc_entry_blkoff(inode, nr), create, NULL, bhp, &cache->prev_entry, &cache->lock); |
5442680fd
|
281 |
} |
db55d9225
|
282 283 284 285 286 287 288 |
/** * nilfs_palloc_block_get_group_desc - get kernel address of a group descriptor * @inode: inode of metadata file using this allocator * @group: group number * @bh: buffer head of the buffer storing the group descriptor block * @kaddr: kernel address mapped for the page including the buffer */ |
5442680fd
|
289 290 291 292 293 294 295 296 |
static struct nilfs_palloc_group_desc * nilfs_palloc_block_get_group_desc(const struct inode *inode, unsigned long group, const struct buffer_head *bh, void *kaddr) { return (struct nilfs_palloc_group_desc *)(kaddr + bh_offset(bh)) + group % nilfs_palloc_groups_per_desc_block(inode); } |
db55d9225
|
297 298 299 300 301 302 303 |
/** * nilfs_palloc_block_get_entry - get kernel address of an entry * @inode: inode of metadata file using this allocator * @nr: serial number of the entry (e.g. inode number) * @bh: buffer head of the buffer storing the entry block * @kaddr: kernel address mapped for the page including the buffer */ |
5442680fd
|
304 305 306 307 308 309 310 311 312 313 314 |
void *nilfs_palloc_block_get_entry(const struct inode *inode, __u64 nr, const struct buffer_head *bh, void *kaddr) { unsigned long entry_offset, group_offset; nilfs_palloc_group(inode, nr, &group_offset); entry_offset = group_offset % NILFS_MDT(inode)->mi_entries_per_block; return kaddr + bh_offset(bh) + entry_offset * NILFS_MDT(inode)->mi_entry_size; } |
db55d9225
|
315 316 317 318 319 320 321 322 |
/** * nilfs_palloc_find_available_slot - find available slot in a group * @inode: inode of metadata file using this allocator * @group: group number * @target: offset number of an entry in the group (start point) * @bitmap: bitmap of the group * @bsize: size in bits */ |
5442680fd
|
323 324 325 326 |
static int nilfs_palloc_find_available_slot(struct inode *inode, unsigned long group, unsigned long target, unsigned char *bitmap, |
db55d9225
|
327 |
int bsize) |
5442680fd
|
328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 |
{ int curr, pos, end, i; if (target > 0) { end = (target + BITS_PER_LONG - 1) & ~(BITS_PER_LONG - 1); if (end > bsize) end = bsize; pos = nilfs_find_next_zero_bit(bitmap, end, target); if (pos < end && !nilfs_set_bit_atomic( nilfs_mdt_bgl_lock(inode, group), pos, bitmap)) return pos; } else end = 0; for (i = 0, curr = end; i < bsize; i += BITS_PER_LONG, curr += BITS_PER_LONG) { /* wrap around */ if (curr >= bsize) curr = 0; while (*((unsigned long *)bitmap + curr / BITS_PER_LONG) != ~0UL) { end = curr + BITS_PER_LONG; if (end > bsize) end = bsize; pos = nilfs_find_next_zero_bit(bitmap, end, curr); if ((pos < end) && !nilfs_set_bit_atomic( nilfs_mdt_bgl_lock(inode, group), pos, bitmap)) return pos; } } return -ENOSPC; } |
db55d9225
|
364 365 366 367 368 369 370 |
/** * nilfs_palloc_rest_groups_in_desc_block - get the remaining number of groups * in a group descriptor block * @inode: inode of metadata file using this allocator * @curr: current group number * @max: maximum number of groups */ |
5442680fd
|
371 372 373 374 375 376 377 378 379 |
static unsigned long nilfs_palloc_rest_groups_in_desc_block(const struct inode *inode, unsigned long curr, unsigned long max) { return min_t(unsigned long, nilfs_palloc_groups_per_desc_block(inode) - curr % nilfs_palloc_groups_per_desc_block(inode), max - curr + 1); } |
db55d9225
|
380 381 382 383 384 |
/** * nilfs_palloc_prepare_alloc_entry - prepare to allocate a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the allocation */ |
5442680fd
|
385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 |
int nilfs_palloc_prepare_alloc_entry(struct inode *inode, struct nilfs_palloc_req *req) { struct buffer_head *desc_bh, *bitmap_bh; struct nilfs_palloc_group_desc *desc; unsigned char *bitmap; void *desc_kaddr, *bitmap_kaddr; unsigned long group, maxgroup, ngroups; unsigned long group_offset, maxgroup_offset; unsigned long n, entries_per_group, groups_per_desc_block; unsigned long i, j; int pos, ret; ngroups = nilfs_palloc_groups_count(inode); maxgroup = ngroups - 1; group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); entries_per_group = nilfs_palloc_entries_per_group(inode); groups_per_desc_block = nilfs_palloc_groups_per_desc_block(inode); for (i = 0; i < ngroups; i += n) { if (group >= ngroups) { /* wrap around */ group = 0; maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr, &maxgroup_offset) - 1; } ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh); if (ret < 0) return ret; desc_kaddr = kmap(desc_bh->b_page); desc = nilfs_palloc_block_get_group_desc( inode, group, desc_bh, desc_kaddr); n = nilfs_palloc_rest_groups_in_desc_block(inode, group, maxgroup); for (j = 0; j < n; j++, desc++, group++) { if (nilfs_palloc_group_desc_nfrees(inode, group, desc) > 0) { ret = nilfs_palloc_get_bitmap_block( inode, group, 1, &bitmap_bh); if (ret < 0) goto out_desc; bitmap_kaddr = kmap(bitmap_bh->b_page); |
141bbdba9
|
427 |
bitmap = bitmap_kaddr + bh_offset(bitmap_bh); |
5442680fd
|
428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 |
pos = nilfs_palloc_find_available_slot( inode, group, group_offset, bitmap, entries_per_group); if (pos >= 0) { /* found a free entry */ nilfs_palloc_group_desc_add_entries( inode, group, desc, -1); req->pr_entry_nr = entries_per_group * group + pos; kunmap(desc_bh->b_page); kunmap(bitmap_bh->b_page); req->pr_desc_bh = desc_bh; req->pr_bitmap_bh = bitmap_bh; return 0; } kunmap(bitmap_bh->b_page); brelse(bitmap_bh); } group_offset = 0; } kunmap(desc_bh->b_page); brelse(desc_bh); } /* no entries left */ return -ENOSPC; out_desc: kunmap(desc_bh->b_page); brelse(desc_bh); return ret; } |
db55d9225
|
463 464 465 466 467 |
/** * nilfs_palloc_commit_alloc_entry - finish allocation of a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the allocation */ |
5442680fd
|
468 469 470 471 472 473 474 475 476 477 |
void nilfs_palloc_commit_alloc_entry(struct inode *inode, struct nilfs_palloc_req *req) { nilfs_mdt_mark_buffer_dirty(req->pr_bitmap_bh); nilfs_mdt_mark_buffer_dirty(req->pr_desc_bh); nilfs_mdt_mark_dirty(inode); brelse(req->pr_bitmap_bh); brelse(req->pr_desc_bh); } |
db55d9225
|
478 479 480 481 482 |
/** * nilfs_palloc_commit_free_entry - finish deallocating a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the removal */ |
5442680fd
|
483 484 485 486 487 488 489 490 491 492 493 494 495 |
void nilfs_palloc_commit_free_entry(struct inode *inode, struct nilfs_palloc_req *req) { struct nilfs_palloc_group_desc *desc; unsigned long group, group_offset; unsigned char *bitmap; void *desc_kaddr, *bitmap_kaddr; group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); desc_kaddr = kmap(req->pr_desc_bh->b_page); desc = nilfs_palloc_block_get_group_desc(inode, group, req->pr_desc_bh, desc_kaddr); bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page); |
141bbdba9
|
496 |
bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh); |
5442680fd
|
497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 |
if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group), group_offset, bitmap)) printk(KERN_WARNING "%s: entry number %llu already freed ", __func__, (unsigned long long)req->pr_entry_nr); nilfs_palloc_group_desc_add_entries(inode, group, desc, 1); kunmap(req->pr_bitmap_bh->b_page); kunmap(req->pr_desc_bh->b_page); nilfs_mdt_mark_buffer_dirty(req->pr_desc_bh); nilfs_mdt_mark_buffer_dirty(req->pr_bitmap_bh); nilfs_mdt_mark_dirty(inode); brelse(req->pr_bitmap_bh); brelse(req->pr_desc_bh); } |
db55d9225
|
516 517 518 519 520 |
/** * nilfs_palloc_abort_alloc_entry - cancel allocation of a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the allocation */ |
5442680fd
|
521 522 523 524 525 526 527 528 529 530 531 532 533 |
void nilfs_palloc_abort_alloc_entry(struct inode *inode, struct nilfs_palloc_req *req) { struct nilfs_palloc_group_desc *desc; void *desc_kaddr, *bitmap_kaddr; unsigned char *bitmap; unsigned long group, group_offset; group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); desc_kaddr = kmap(req->pr_desc_bh->b_page); desc = nilfs_palloc_block_get_group_desc(inode, group, req->pr_desc_bh, desc_kaddr); bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page); |
141bbdba9
|
534 |
bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh); |
5442680fd
|
535 536 |
if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group), group_offset, bitmap)) |
be3bd2223
|
537 538 |
printk(KERN_WARNING "%s: entry number %llu already freed ", |
5442680fd
|
539 540 541 542 543 544 545 546 547 548 549 550 551 552 |
__func__, (unsigned long long)req->pr_entry_nr); nilfs_palloc_group_desc_add_entries(inode, group, desc, 1); kunmap(req->pr_bitmap_bh->b_page); kunmap(req->pr_desc_bh->b_page); brelse(req->pr_bitmap_bh); brelse(req->pr_desc_bh); req->pr_entry_nr = 0; req->pr_bitmap_bh = NULL; req->pr_desc_bh = NULL; } |
db55d9225
|
553 554 555 556 557 |
/** * nilfs_palloc_prepare_free_entry - prepare to deallocate a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the removal */ |
5442680fd
|
558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 |
int nilfs_palloc_prepare_free_entry(struct inode *inode, struct nilfs_palloc_req *req) { struct buffer_head *desc_bh, *bitmap_bh; unsigned long group, group_offset; int ret; group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh); if (ret < 0) return ret; ret = nilfs_palloc_get_bitmap_block(inode, group, 1, &bitmap_bh); if (ret < 0) { brelse(desc_bh); return ret; } req->pr_desc_bh = desc_bh; req->pr_bitmap_bh = bitmap_bh; return 0; } |
db55d9225
|
579 580 581 582 583 |
/** * nilfs_palloc_abort_free_entry - cancel deallocating a persistent object * @inode: inode of metadata file using this allocator * @req: nilfs_palloc_req structure exchanged for the removal */ |
5442680fd
|
584 585 586 587 588 589 590 591 592 593 |
void nilfs_palloc_abort_free_entry(struct inode *inode, struct nilfs_palloc_req *req) { brelse(req->pr_bitmap_bh); brelse(req->pr_desc_bh); req->pr_entry_nr = 0; req->pr_bitmap_bh = NULL; req->pr_desc_bh = NULL; } |
db55d9225
|
594 595 596 597 598 599 |
/** * nilfs_palloc_group_is_in - judge if an entry is in a group * @inode: inode of metadata file using this allocator * @group: group number * @nr: serial number of the entry (e.g. inode number) */ |
5442680fd
|
600 601 602 603 604 605 606 607 608 |
static int nilfs_palloc_group_is_in(struct inode *inode, unsigned long group, __u64 nr) { __u64 first, last; first = group * nilfs_palloc_entries_per_group(inode); last = first + nilfs_palloc_entries_per_group(inode) - 1; return (nr >= first) && (nr <= last); } |
db55d9225
|
609 610 611 612 613 614 |
/** * nilfs_palloc_freev - deallocate a set of persistent objects * @inode: inode of metadata file using this allocator * @entry_nrs: array of entry numbers to be deallocated * @nitems: number of entries stored in @entry_nrs */ |
5442680fd
|
615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 |
int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems) { struct buffer_head *desc_bh, *bitmap_bh; struct nilfs_palloc_group_desc *desc; unsigned char *bitmap; void *desc_kaddr, *bitmap_kaddr; unsigned long group, group_offset; int i, j, n, ret; for (i = 0; i < nitems; i += n) { group = nilfs_palloc_group(inode, entry_nrs[i], &group_offset); ret = nilfs_palloc_get_desc_block(inode, group, 0, &desc_bh); if (ret < 0) return ret; ret = nilfs_palloc_get_bitmap_block(inode, group, 0, &bitmap_bh); if (ret < 0) { brelse(desc_bh); return ret; } desc_kaddr = kmap(desc_bh->b_page); desc = nilfs_palloc_block_get_group_desc( inode, group, desc_bh, desc_kaddr); bitmap_kaddr = kmap(bitmap_bh->b_page); |
141bbdba9
|
639 |
bitmap = bitmap_kaddr + bh_offset(bitmap_bh); |
5442680fd
|
640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 |
for (j = i, n = 0; (j < nitems) && nilfs_palloc_group_is_in(inode, group, entry_nrs[j]); j++, n++) { nilfs_palloc_group(inode, entry_nrs[j], &group_offset); if (!nilfs_clear_bit_atomic( nilfs_mdt_bgl_lock(inode, group), group_offset, bitmap)) { printk(KERN_WARNING "%s: entry number %llu already freed ", __func__, (unsigned long long)entry_nrs[j]); } } nilfs_palloc_group_desc_add_entries(inode, group, desc, n); kunmap(bitmap_bh->b_page); kunmap(desc_bh->b_page); nilfs_mdt_mark_buffer_dirty(desc_bh); nilfs_mdt_mark_buffer_dirty(bitmap_bh); nilfs_mdt_mark_dirty(inode); brelse(bitmap_bh); brelse(desc_bh); } return 0; } |
db38d5ad3
|
669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 |
void nilfs_palloc_setup_cache(struct inode *inode, struct nilfs_palloc_cache *cache) { NILFS_MDT(inode)->mi_palloc_cache = cache; spin_lock_init(&cache->lock); } void nilfs_palloc_clear_cache(struct inode *inode) { struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; spin_lock(&cache->lock); brelse(cache->prev_desc.bh); brelse(cache->prev_bitmap.bh); brelse(cache->prev_entry.bh); cache->prev_desc.bh = NULL; cache->prev_bitmap.bh = NULL; cache->prev_entry.bh = NULL; spin_unlock(&cache->lock); } void nilfs_palloc_destroy_cache(struct inode *inode) { nilfs_palloc_clear_cache(inode); NILFS_MDT(inode)->mi_palloc_cache = NULL; } |