Blame view
fs/ocfs2/extent_map.c
23.2 KB
ccd979bdb [PATCH] OCFS2: Th... |
1 2 3 4 5 |
/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * extent_map.c * |
363041a5f ocfs2: temporaril... |
6 |
* Block/Cluster mapping functions |
ccd979bdb [PATCH] OCFS2: Th... |
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 |
* * Copyright (C) 2004 Oracle. All rights reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License, version 2, as published by the Free Software Foundation. * * 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., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. */ #include <linux/fs.h> #include <linux/init.h> |
5a0e3ad6a include cleanup: ... |
27 |
#include <linux/slab.h> |
ccd979bdb [PATCH] OCFS2: Th... |
28 |
#include <linux/types.h> |
00dc417fa ocfs2: fiemap sup... |
29 |
#include <linux/fiemap.h> |
ccd979bdb [PATCH] OCFS2: Th... |
30 |
|
ccd979bdb [PATCH] OCFS2: Th... |
31 32 33 |
#include <cluster/masklog.h> #include "ocfs2.h" |
363041a5f ocfs2: temporaril... |
34 |
#include "alloc.h" |
00dc417fa ocfs2: fiemap sup... |
35 |
#include "dlmglue.h" |
ccd979bdb [PATCH] OCFS2: Th... |
36 37 38 |
#include "extent_map.h" #include "inode.h" #include "super.h" |
86239d59e Ocfs2: Let ocfs2 ... |
39 |
#include "symlink.h" |
a716357c4 ocfs2: Remove mas... |
40 |
#include "ocfs2_trace.h" |
ccd979bdb [PATCH] OCFS2: Th... |
41 42 |
#include "buffer_head_io.h" |
ccd979bdb [PATCH] OCFS2: Th... |
43 |
/* |
834189788 ocfs2: Cache exte... |
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 |
* The extent caching implementation is intentionally trivial. * * We only cache a small number of extents stored directly on the * inode, so linear order operations are acceptable. If we ever want * to increase the size of the extent map, then these algorithms must * get smarter. */ void ocfs2_extent_map_init(struct inode *inode) { struct ocfs2_inode_info *oi = OCFS2_I(inode); oi->ip_extent_map.em_num_items = 0; INIT_LIST_HEAD(&oi->ip_extent_map.em_list); } static void __ocfs2_extent_map_lookup(struct ocfs2_extent_map *em, unsigned int cpos, struct ocfs2_extent_map_item **ret_emi) { unsigned int range; struct ocfs2_extent_map_item *emi; *ret_emi = NULL; list_for_each_entry(emi, &em->em_list, ei_list) { range = emi->ei_cpos + emi->ei_clusters; if (cpos >= emi->ei_cpos && cpos < range) { list_move(&emi->ei_list, &em->em_list); *ret_emi = emi; break; } } } static int ocfs2_extent_map_lookup(struct inode *inode, unsigned int cpos, unsigned int *phys, unsigned int *len, unsigned int *flags) { unsigned int coff; struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_extent_map_item *emi; spin_lock(&oi->ip_lock); __ocfs2_extent_map_lookup(&oi->ip_extent_map, cpos, &emi); if (emi) { coff = cpos - emi->ei_cpos; *phys = emi->ei_phys + coff; if (len) *len = emi->ei_clusters - coff; if (flags) *flags = emi->ei_flags; } spin_unlock(&oi->ip_lock); if (emi == NULL) return -ENOENT; return 0; } /* * Forget about all clusters equal to or greater than cpos. */ void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cpos) { |
800deef3f [PATCH] ocfs2: us... |
114 |
struct ocfs2_extent_map_item *emi, *n; |
834189788 ocfs2: Cache exte... |
115 116 117 118 119 120 |
struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_extent_map *em = &oi->ip_extent_map; LIST_HEAD(tmp_list); unsigned int range; spin_lock(&oi->ip_lock); |
800deef3f [PATCH] ocfs2: us... |
121 |
list_for_each_entry_safe(emi, n, &em->em_list, ei_list) { |
834189788 ocfs2: Cache exte... |
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 |
if (emi->ei_cpos >= cpos) { /* Full truncate of this record. */ list_move(&emi->ei_list, &tmp_list); BUG_ON(em->em_num_items == 0); em->em_num_items--; continue; } range = emi->ei_cpos + emi->ei_clusters; if (range > cpos) { /* Partial truncate */ emi->ei_clusters = cpos - emi->ei_cpos; } } spin_unlock(&oi->ip_lock); |
800deef3f [PATCH] ocfs2: us... |
137 |
list_for_each_entry_safe(emi, n, &tmp_list, ei_list) { |
834189788 ocfs2: Cache exte... |
138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 |
list_del(&emi->ei_list); kfree(emi); } } /* * Is any part of emi2 contained within emi1 */ static int ocfs2_ei_is_contained(struct ocfs2_extent_map_item *emi1, struct ocfs2_extent_map_item *emi2) { unsigned int range1, range2; /* * Check if logical start of emi2 is inside emi1 */ range1 = emi1->ei_cpos + emi1->ei_clusters; if (emi2->ei_cpos >= emi1->ei_cpos && emi2->ei_cpos < range1) return 1; /* * Check if logical end of emi2 is inside emi1 */ range2 = emi2->ei_cpos + emi2->ei_clusters; if (range2 > emi1->ei_cpos && range2 <= range1) return 1; return 0; } static void ocfs2_copy_emi_fields(struct ocfs2_extent_map_item *dest, struct ocfs2_extent_map_item *src) { dest->ei_cpos = src->ei_cpos; dest->ei_phys = src->ei_phys; dest->ei_clusters = src->ei_clusters; dest->ei_flags = src->ei_flags; } /* * Try to merge emi with ins. Returns 1 if merge succeeds, zero * otherwise. */ static int ocfs2_try_to_merge_extent_map(struct ocfs2_extent_map_item *emi, struct ocfs2_extent_map_item *ins) { /* * Handle contiguousness */ if (ins->ei_phys == (emi->ei_phys + emi->ei_clusters) && ins->ei_cpos == (emi->ei_cpos + emi->ei_clusters) && ins->ei_flags == emi->ei_flags) { emi->ei_clusters += ins->ei_clusters; return 1; } else if ((ins->ei_phys + ins->ei_clusters) == emi->ei_phys && |
bd6b0bf87 ocfs2: Fix contig... |
193 |
(ins->ei_cpos + ins->ei_clusters) == emi->ei_cpos && |
834189788 ocfs2: Cache exte... |
194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 |
ins->ei_flags == emi->ei_flags) { emi->ei_phys = ins->ei_phys; emi->ei_cpos = ins->ei_cpos; emi->ei_clusters += ins->ei_clusters; return 1; } /* * Overlapping extents - this shouldn't happen unless we've * split an extent to change it's flags. That is exceedingly * rare, so there's no sense in trying to optimize it yet. */ if (ocfs2_ei_is_contained(emi, ins) || ocfs2_ei_is_contained(ins, emi)) { ocfs2_copy_emi_fields(emi, ins); return 1; } /* No merge was possible. */ return 0; } /* * In order to reduce complexity on the caller, this insert function * is intentionally liberal in what it will accept. * * The only rule is that the truncate call *must* be used whenever * records have been deleted. This avoids inserting overlapping * records with different physical mappings. */ void ocfs2_extent_map_insert_rec(struct inode *inode, struct ocfs2_extent_rec *rec) { struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_extent_map *em = &oi->ip_extent_map; struct ocfs2_extent_map_item *emi, *new_emi = NULL; struct ocfs2_extent_map_item ins; ins.ei_cpos = le32_to_cpu(rec->e_cpos); ins.ei_phys = ocfs2_blocks_to_clusters(inode->i_sb, le64_to_cpu(rec->e_blkno)); ins.ei_clusters = le16_to_cpu(rec->e_leaf_clusters); ins.ei_flags = rec->e_flags; search: spin_lock(&oi->ip_lock); list_for_each_entry(emi, &em->em_list, ei_list) { if (ocfs2_try_to_merge_extent_map(emi, &ins)) { list_move(&emi->ei_list, &em->em_list); spin_unlock(&oi->ip_lock); goto out; } } /* * No item could be merged. * * Either allocate and add a new item, or overwrite the last recently * inserted. */ if (em->em_num_items < OCFS2_MAX_EXTENT_MAP_ITEMS) { if (new_emi == NULL) { spin_unlock(&oi->ip_lock); new_emi = kmalloc(sizeof(*new_emi), GFP_NOFS); if (new_emi == NULL) goto out; goto search; } ocfs2_copy_emi_fields(new_emi, &ins); list_add(&new_emi->ei_list, &em->em_list); em->em_num_items++; new_emi = NULL; } else { BUG_ON(list_empty(&em->em_list) || em->em_num_items == 0); emi = list_entry(em->em_list.prev, struct ocfs2_extent_map_item, ei_list); list_move(&emi->ei_list, &em->em_list); ocfs2_copy_emi_fields(emi, &ins); } spin_unlock(&oi->ip_lock); out: |
d787ab097 ocfs2: remove kfr... |
282 |
kfree(new_emi); |
834189788 ocfs2: Cache exte... |
283 |
} |
00dc417fa ocfs2: fiemap sup... |
284 285 286 287 288 289 290 291 |
static int ocfs2_last_eb_is_empty(struct inode *inode, struct ocfs2_dinode *di) { int ret, next_free; u64 last_eb_blk = le64_to_cpu(di->i_last_eb_blk); struct buffer_head *eb_bh = NULL; struct ocfs2_extent_block *eb; struct ocfs2_extent_list *el; |
3d03a305d ocfs2: Pass ocfs2... |
292 |
ret = ocfs2_read_extent_block(INODE_CACHE(inode), last_eb_blk, &eb_bh); |
00dc417fa ocfs2: fiemap sup... |
293 294 295 296 297 298 299 |
if (ret) { mlog_errno(ret); goto out; } eb = (struct ocfs2_extent_block *) eb_bh->b_data; el = &eb->h_list; |
00dc417fa ocfs2: fiemap sup... |
300 301 |
if (el->l_tree_depth) { ocfs2_error(inode->i_sb, |
7ecef14ab ocfs2: neaten do_... |
302 303 304 |
"Inode %lu has non zero tree depth in leaf block %llu ", inode->i_ino, |
00dc417fa ocfs2: fiemap sup... |
305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 |
(unsigned long long)eb_bh->b_blocknr); ret = -EROFS; goto out; } next_free = le16_to_cpu(el->l_next_free_rec); if (next_free == 0 || (next_free == 1 && ocfs2_is_empty_extent(&el->l_recs[0]))) ret = 1; out: brelse(eb_bh); return ret; } |
834189788 ocfs2: Cache exte... |
320 |
/* |
4f902c377 ocfs2: Fix extent... |
321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 |
* Return the 1st index within el which contains an extent start * larger than v_cluster. */ static int ocfs2_search_for_hole_index(struct ocfs2_extent_list *el, u32 v_cluster) { int i; struct ocfs2_extent_rec *rec; for(i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) { rec = &el->l_recs[i]; if (v_cluster < le32_to_cpu(rec->e_cpos)) break; } return i; } /* * Figure out the size of a hole which starts at v_cluster within the given * extent list. * * If there is no more allocation past v_cluster, we return the maximum * cluster size minus v_cluster. * * If we have in-inode extents, then el points to the dinode list and * eb_bh is NULL. Otherwise, eb_bh should point to the extent block * containing el. */ |
e73a819db ocfs2: Add suppor... |
351 352 353 354 355 |
int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci, struct ocfs2_extent_list *el, struct buffer_head *eb_bh, u32 v_cluster, u32 *num_clusters) |
4f902c377 ocfs2: Fix extent... |
356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 |
{ int ret, i; struct buffer_head *next_eb_bh = NULL; struct ocfs2_extent_block *eb, *next_eb; i = ocfs2_search_for_hole_index(el, v_cluster); if (i == le16_to_cpu(el->l_next_free_rec) && eb_bh) { eb = (struct ocfs2_extent_block *)eb_bh->b_data; /* * Check the next leaf for any extents. */ if (le64_to_cpu(eb->h_next_leaf_blk) == 0ULL) goto no_more_extents; |
e73a819db ocfs2: Add suppor... |
372 |
ret = ocfs2_read_extent_block(ci, |
5e96581a3 ocfs2: Wrap exten... |
373 374 |
le64_to_cpu(eb->h_next_leaf_blk), &next_eb_bh); |
4f902c377 ocfs2: Fix extent... |
375 376 377 378 |
if (ret) { mlog_errno(ret); goto out; } |
4f902c377 ocfs2: Fix extent... |
379 |
|
5e96581a3 ocfs2: Wrap exten... |
380 |
next_eb = (struct ocfs2_extent_block *)next_eb_bh->b_data; |
4f902c377 ocfs2: Fix extent... |
381 |
el = &next_eb->h_list; |
4f902c377 ocfs2: Fix extent... |
382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 |
i = ocfs2_search_for_hole_index(el, v_cluster); } no_more_extents: if (i == le16_to_cpu(el->l_next_free_rec)) { /* * We're at the end of our existing allocation. Just * return the maximum number of clusters we could * possibly allocate. */ *num_clusters = UINT_MAX - v_cluster; } else { *num_clusters = le32_to_cpu(el->l_recs[i].e_cpos) - v_cluster; } ret = 0; out: brelse(next_eb_bh); return ret; } |
00dc417fa ocfs2: fiemap sup... |
402 403 404 405 406 |
static int ocfs2_get_clusters_nocache(struct inode *inode, struct buffer_head *di_bh, u32 v_cluster, unsigned int *hole_len, struct ocfs2_extent_rec *ret_rec, unsigned int *is_last) |
ccd979bdb [PATCH] OCFS2: Th... |
407 |
{ |
00dc417fa ocfs2: fiemap sup... |
408 |
int i, ret, tree_height, len; |
ccd979bdb [PATCH] OCFS2: Th... |
409 |
struct ocfs2_dinode *di; |
00dc417fa ocfs2: fiemap sup... |
410 |
struct ocfs2_extent_block *uninitialized_var(eb); |
ccd979bdb [PATCH] OCFS2: Th... |
411 |
struct ocfs2_extent_list *el; |
363041a5f ocfs2: temporaril... |
412 |
struct ocfs2_extent_rec *rec; |
00dc417fa ocfs2: fiemap sup... |
413 |
struct buffer_head *eb_bh = NULL; |
834189788 ocfs2: Cache exte... |
414 |
|
00dc417fa ocfs2: fiemap sup... |
415 416 417 |
memset(ret_rec, 0, sizeof(*ret_rec)); if (is_last) *is_last = 0; |
ccd979bdb [PATCH] OCFS2: Th... |
418 |
|
363041a5f ocfs2: temporaril... |
419 420 |
di = (struct ocfs2_dinode *) di_bh->b_data; el = &di->id2.i_list; |
00dc417fa ocfs2: fiemap sup... |
421 |
tree_height = le16_to_cpu(el->l_tree_depth); |
ccd979bdb [PATCH] OCFS2: Th... |
422 |
|
00dc417fa ocfs2: fiemap sup... |
423 |
if (tree_height > 0) { |
facdb77f5 ocfs2: ocfs2_find... |
424 425 |
ret = ocfs2_find_leaf(INODE_CACHE(inode), el, v_cluster, &eb_bh); |
363041a5f ocfs2: temporaril... |
426 427 428 429 |
if (ret) { mlog_errno(ret); goto out; } |
ccd979bdb [PATCH] OCFS2: Th... |
430 |
|
363041a5f ocfs2: temporaril... |
431 432 |
eb = (struct ocfs2_extent_block *) eb_bh->b_data; el = &eb->h_list; |
e48edee2d ocfs2: make room ... |
433 434 435 |
if (el->l_tree_depth) { ocfs2_error(inode->i_sb, |
7ecef14ab ocfs2: neaten do_... |
436 437 438 |
"Inode %lu has non zero tree depth in leaf block %llu ", inode->i_ino, |
e48edee2d ocfs2: make room ... |
439 440 441 442 |
(unsigned long long)eb_bh->b_blocknr); ret = -EROFS; goto out; } |
a43db30c7 ocfs2: silence -E... |
443 |
} |
ccd979bdb [PATCH] OCFS2: Th... |
444 |
|
363041a5f ocfs2: temporaril... |
445 446 |
i = ocfs2_search_extent_list(el, v_cluster); if (i == -1) { |
a43db30c7 ocfs2: silence -E... |
447 |
/* |
00dc417fa ocfs2: fiemap sup... |
448 |
* Holes can be larger than the maximum size of an |
3ad2f3fbb tree-wide: Assort... |
449 |
* extent, so we return their lengths in a separate |
00dc417fa ocfs2: fiemap sup... |
450 |
* field. |
a43db30c7 ocfs2: silence -E... |
451 |
*/ |
00dc417fa ocfs2: fiemap sup... |
452 |
if (hole_len) { |
e73a819db ocfs2: Add suppor... |
453 454 |
ret = ocfs2_figure_hole_clusters(INODE_CACHE(inode), el, eb_bh, |
00dc417fa ocfs2: fiemap sup... |
455 |
v_cluster, &len); |
4f902c377 ocfs2: Fix extent... |
456 457 458 459 |
if (ret) { mlog_errno(ret); goto out; } |
00dc417fa ocfs2: fiemap sup... |
460 461 |
*hole_len = len; |
4f902c377 ocfs2: Fix extent... |
462 |
} |
00dc417fa ocfs2: fiemap sup... |
463 464 |
goto out_hole; } |
ccd979bdb [PATCH] OCFS2: Th... |
465 |
|
00dc417fa ocfs2: fiemap sup... |
466 |
rec = &el->l_recs[i]; |
ccd979bdb [PATCH] OCFS2: Th... |
467 |
|
00dc417fa ocfs2: fiemap sup... |
468 469 470 |
BUG_ON(v_cluster < le32_to_cpu(rec->e_cpos)); if (!rec->e_blkno) { |
7ecef14ab ocfs2: neaten do_... |
471 472 473 474 |
ocfs2_error(inode->i_sb, "Inode %lu has bad extent record (%u, %u, 0) ", inode->i_ino, |
00dc417fa ocfs2: fiemap sup... |
475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 |
le32_to_cpu(rec->e_cpos), ocfs2_rec_clusters(el, rec)); ret = -EROFS; goto out; } *ret_rec = *rec; /* * Checking for last extent is potentially expensive - we * might have to look at the next leaf over to see if it's * empty. * * The first two checks are to see whether the caller even * cares for this information, and if the extent is at least * the last in it's list. * * If those hold true, then the extent is last if any of the * additional conditions hold true: * - Extent list is in-inode * - Extent list is right-most * - Extent list is 2nd to rightmost, with empty right-most */ if (is_last) { if (i == (le16_to_cpu(el->l_next_free_rec) - 1)) { if (tree_height == 0) *is_last = 1; else if (eb->h_blkno == di->i_last_eb_blk) *is_last = 1; else if (eb->h_next_leaf_blk == di->i_last_eb_blk) { ret = ocfs2_last_eb_is_empty(inode, di); if (ret < 0) { mlog_errno(ret); goto out; } if (ret == 1) *is_last = 1; } |
ccd979bdb [PATCH] OCFS2: Th... |
513 |
} |
00dc417fa ocfs2: fiemap sup... |
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 |
} out_hole: ret = 0; out: brelse(eb_bh); return ret; } static void ocfs2_relative_extent_offsets(struct super_block *sb, u32 v_cluster, struct ocfs2_extent_rec *rec, u32 *p_cluster, u32 *num_clusters) { u32 coff = v_cluster - le32_to_cpu(rec->e_cpos); *p_cluster = ocfs2_blocks_to_clusters(sb, le64_to_cpu(rec->e_blkno)); *p_cluster = *p_cluster + coff; if (num_clusters) *num_clusters = le16_to_cpu(rec->e_leaf_clusters) - coff; } |
f56654c43 ocfs2: Add extent... |
537 538 |
int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster, u32 *num_clusters, |
1061f9c1c ocfs2: Return ext... |
539 540 |
struct ocfs2_extent_list *el, unsigned int *extent_flags) |
f56654c43 ocfs2: Add extent... |
541 542 543 544 545 546 547 548 |
{ int ret = 0, i; struct buffer_head *eb_bh = NULL; struct ocfs2_extent_block *eb; struct ocfs2_extent_rec *rec; u32 coff; if (el->l_tree_depth) { |
facdb77f5 ocfs2: ocfs2_find... |
549 550 |
ret = ocfs2_find_leaf(INODE_CACHE(inode), el, v_cluster, &eb_bh); |
f56654c43 ocfs2: Add extent... |
551 552 553 554 555 556 557 558 559 560 |
if (ret) { mlog_errno(ret); goto out; } eb = (struct ocfs2_extent_block *) eb_bh->b_data; el = &eb->h_list; if (el->l_tree_depth) { ocfs2_error(inode->i_sb, |
7ecef14ab ocfs2: neaten do_... |
561 562 563 |
"Inode %lu has non zero tree depth in xattr leaf block %llu ", inode->i_ino, |
f56654c43 ocfs2: Add extent... |
564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 |
(unsigned long long)eb_bh->b_blocknr); ret = -EROFS; goto out; } } i = ocfs2_search_extent_list(el, v_cluster); if (i == -1) { ret = -EROFS; mlog_errno(ret); goto out; } else { rec = &el->l_recs[i]; BUG_ON(v_cluster < le32_to_cpu(rec->e_cpos)); if (!rec->e_blkno) { |
7ecef14ab ocfs2: neaten do_... |
580 581 582 583 |
ocfs2_error(inode->i_sb, "Inode %lu has bad extent record (%u, %u, 0) in xattr ", inode->i_ino, |
f56654c43 ocfs2: Add extent... |
584 585 586 587 588 589 590 591 592 593 594 |
le32_to_cpu(rec->e_cpos), ocfs2_rec_clusters(el, rec)); ret = -EROFS; goto out; } coff = v_cluster - le32_to_cpu(rec->e_cpos); *p_cluster = ocfs2_blocks_to_clusters(inode->i_sb, le64_to_cpu(rec->e_blkno)); *p_cluster = *p_cluster + coff; if (num_clusters) *num_clusters = ocfs2_rec_clusters(el, rec) - coff; |
1061f9c1c ocfs2: Return ext... |
595 596 597 |
if (extent_flags) *extent_flags = rec->e_flags; |
f56654c43 ocfs2: Add extent... |
598 599 600 601 602 603 |
} out: if (eb_bh) brelse(eb_bh); return ret; } |
00dc417fa ocfs2: fiemap sup... |
604 605 606 607 608 609 610 611 |
int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster, u32 *num_clusters, unsigned int *extent_flags) { int ret; unsigned int uninitialized_var(hole_len), flags = 0; struct buffer_head *di_bh = NULL; struct ocfs2_extent_rec rec; |
ccd979bdb [PATCH] OCFS2: Th... |
612 |
|
00dc417fa ocfs2: fiemap sup... |
613 614 615 616 617 |
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { ret = -ERANGE; mlog_errno(ret); goto out; } |
ccd979bdb [PATCH] OCFS2: Th... |
618 |
|
00dc417fa ocfs2: fiemap sup... |
619 620 621 622 |
ret = ocfs2_extent_map_lookup(inode, v_cluster, p_cluster, num_clusters, extent_flags); if (ret == 0) goto out; |
ccd979bdb [PATCH] OCFS2: Th... |
623 |
|
b657c95c1 ocfs2: Wrap inode... |
624 |
ret = ocfs2_read_inode_block(inode, &di_bh); |
00dc417fa ocfs2: fiemap sup... |
625 626 627 628 |
if (ret) { mlog_errno(ret); goto out; } |
49cb8d2d4 ocfs2: Read from ... |
629 |
|
00dc417fa ocfs2: fiemap sup... |
630 631 632 633 634 635 |
ret = ocfs2_get_clusters_nocache(inode, di_bh, v_cluster, &hole_len, &rec, NULL); if (ret) { mlog_errno(ret); goto out; } |
834189788 ocfs2: Cache exte... |
636 |
|
00dc417fa ocfs2: fiemap sup... |
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 |
if (rec.e_blkno == 0ULL) { /* * A hole was found. Return some canned values that * callers can key on. If asked for, num_clusters will * be populated with the size of the hole. */ *p_cluster = 0; if (num_clusters) { *num_clusters = hole_len; } } else { ocfs2_relative_extent_offsets(inode->i_sb, v_cluster, &rec, p_cluster, num_clusters); flags = rec.e_flags; ocfs2_extent_map_insert_rec(inode, &rec); |
ccd979bdb [PATCH] OCFS2: Th... |
653 |
} |
49cb8d2d4 ocfs2: Read from ... |
654 655 |
if (extent_flags) *extent_flags = flags; |
363041a5f ocfs2: temporaril... |
656 657 |
out: brelse(di_bh); |
ccd979bdb [PATCH] OCFS2: Th... |
658 659 |
return ret; } |
ccd979bdb [PATCH] OCFS2: Th... |
660 |
/* |
363041a5f ocfs2: temporaril... |
661 662 |
* This expects alloc_sem to be held. The allocation cannot change at * all while the map is in the process of being updated. |
ccd979bdb [PATCH] OCFS2: Th... |
663 |
*/ |
363041a5f ocfs2: temporaril... |
664 |
int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno, |
4f902c377 ocfs2: Fix extent... |
665 |
u64 *ret_count, unsigned int *extent_flags) |
ccd979bdb [PATCH] OCFS2: Th... |
666 667 |
{ int ret; |
ccd979bdb [PATCH] OCFS2: Th... |
668 |
int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); |
363041a5f ocfs2: temporaril... |
669 670 |
u32 cpos, num_clusters, p_cluster; u64 boff = 0; |
ccd979bdb [PATCH] OCFS2: Th... |
671 672 |
cpos = ocfs2_blocks_to_clusters(inode->i_sb, v_blkno); |
ccd979bdb [PATCH] OCFS2: Th... |
673 |
|
49cb8d2d4 ocfs2: Read from ... |
674 675 |
ret = ocfs2_get_clusters(inode, cpos, &p_cluster, &num_clusters, extent_flags); |
ccd979bdb [PATCH] OCFS2: Th... |
676 677 |
if (ret) { mlog_errno(ret); |
363041a5f ocfs2: temporaril... |
678 |
goto out; |
ccd979bdb [PATCH] OCFS2: Th... |
679 |
} |
363041a5f ocfs2: temporaril... |
680 681 682 683 684 |
/* * p_cluster == 0 indicates a hole. */ if (p_cluster) { boff = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); |
ccd979bdb [PATCH] OCFS2: Th... |
685 |
boff += (v_blkno & (u64)(bpc - 1)); |
ccd979bdb [PATCH] OCFS2: Th... |
686 |
} |
363041a5f ocfs2: temporaril... |
687 |
*p_blkno = boff; |
ccd979bdb [PATCH] OCFS2: Th... |
688 |
|
363041a5f ocfs2: temporaril... |
689 690 691 |
if (ret_count) { *ret_count = ocfs2_clusters_to_blocks(inode->i_sb, num_clusters); *ret_count -= v_blkno & (u64)(bpc - 1); |
ccd979bdb [PATCH] OCFS2: Th... |
692 |
} |
ccd979bdb [PATCH] OCFS2: Th... |
693 |
|
363041a5f ocfs2: temporaril... |
694 695 |
out: return ret; |
ccd979bdb [PATCH] OCFS2: Th... |
696 |
} |
00dc417fa ocfs2: fiemap sup... |
697 |
|
86239d59e Ocfs2: Let ocfs2 ... |
698 699 700 701 702 703 |
/* * The ocfs2_fiemap_inline() may be a little bit misleading, since * it not only handles the fiemap for inlined files, but also deals * with the fast symlink, cause they have no difference for extent * mapping per se. */ |
00dc417fa ocfs2: fiemap sup... |
704 705 706 707 708 709 710 711 712 713 714 715 |
static int ocfs2_fiemap_inline(struct inode *inode, struct buffer_head *di_bh, struct fiemap_extent_info *fieinfo, u64 map_start) { int ret; unsigned int id_count; struct ocfs2_dinode *di; u64 phys; u32 flags = FIEMAP_EXTENT_DATA_INLINE|FIEMAP_EXTENT_LAST; struct ocfs2_inode_info *oi = OCFS2_I(inode); di = (struct ocfs2_dinode *)di_bh->b_data; |
86239d59e Ocfs2: Let ocfs2 ... |
716 717 718 719 |
if (ocfs2_inode_is_fast_symlink(inode)) id_count = ocfs2_fast_symlink_chars(inode->i_sb); else id_count = le16_to_cpu(di->id2.i_data.id_count); |
00dc417fa ocfs2: fiemap sup... |
720 721 722 |
if (map_start < id_count) { phys = oi->ip_blkno << inode->i_sb->s_blocksize_bits; |
86239d59e Ocfs2: Let ocfs2 ... |
723 724 725 726 727 |
if (ocfs2_inode_is_fast_symlink(inode)) phys += offsetof(struct ocfs2_dinode, id2.i_symlink); else phys += offsetof(struct ocfs2_dinode, id2.i_data.id_data); |
00dc417fa ocfs2: fiemap sup... |
728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 |
ret = fiemap_fill_next_extent(fieinfo, 0, phys, id_count, flags); if (ret < 0) return ret; } return 0; } #define OCFS2_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC) int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 map_start, u64 map_len) { int ret, is_last; u32 mapping_end, cpos; unsigned int hole_size; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); u64 len_bytes, phys_bytes, virt_bytes; struct buffer_head *di_bh = NULL; struct ocfs2_extent_rec rec; ret = fiemap_check_flags(fieinfo, OCFS2_FIEMAP_FLAGS); if (ret) return ret; ret = ocfs2_inode_lock(inode, &di_bh, 0); if (ret) { mlog_errno(ret); goto out; } down_read(&OCFS2_I(inode)->ip_alloc_sem); /* |
86239d59e Ocfs2: Let ocfs2 ... |
764 |
* Handle inline-data and fast symlink separately. |
00dc417fa ocfs2: fiemap sup... |
765 |
*/ |
86239d59e Ocfs2: Let ocfs2 ... |
766 767 |
if ((OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) || ocfs2_inode_is_fast_symlink(inode)) { |
00dc417fa ocfs2: fiemap sup... |
768 769 770 771 772 773 774 |
ret = ocfs2_fiemap_inline(inode, di_bh, fieinfo, map_start); goto out_unlock; } cpos = map_start >> osb->s_clustersize_bits; mapping_end = ocfs2_clusters_for_bytes(inode->i_sb, map_start + map_len); |
00dc417fa ocfs2: fiemap sup... |
775 776 777 778 779 780 781 782 |
is_last = 0; while (cpos < mapping_end && !is_last) { u32 fe_flags; ret = ocfs2_get_clusters_nocache(inode, di_bh, cpos, &hole_size, &rec, &is_last); if (ret) { mlog_errno(ret); |
b4ca2b4b5 ocfs2: goto out_u... |
783 |
goto out_unlock; |
00dc417fa ocfs2: fiemap sup... |
784 785 786 787 788 789 790 791 792 793 |
} if (rec.e_blkno == 0ULL) { cpos += hole_size; continue; } fe_flags = 0; if (rec.e_flags & OCFS2_EXT_UNWRITTEN) fe_flags |= FIEMAP_EXTENT_UNWRITTEN; |
faf8b70f7 ocfs2: Use FIEMAP... |
794 795 |
if (rec.e_flags & OCFS2_EXT_REFCOUNTED) fe_flags |= FIEMAP_EXTENT_SHARED; |
00dc417fa ocfs2: fiemap sup... |
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 |
if (is_last) fe_flags |= FIEMAP_EXTENT_LAST; len_bytes = (u64)le16_to_cpu(rec.e_leaf_clusters) << osb->s_clustersize_bits; phys_bytes = le64_to_cpu(rec.e_blkno) << osb->sb->s_blocksize_bits; virt_bytes = (u64)le32_to_cpu(rec.e_cpos) << osb->s_clustersize_bits; ret = fiemap_fill_next_extent(fieinfo, virt_bytes, phys_bytes, len_bytes, fe_flags); if (ret) break; cpos = le32_to_cpu(rec.e_cpos)+ le16_to_cpu(rec.e_leaf_clusters); } if (ret > 0) ret = 0; out_unlock: brelse(di_bh); up_read(&OCFS2_I(inode)->ip_alloc_sem); ocfs2_inode_unlock(inode, 0); out: return ret; } |
a8549fb5a ocfs2: Wrap virtu... |
823 |
|
965c8e59c lseek: the "whenc... |
824 |
int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int whence) |
93862d5e1 ocfs2: Implement ... |
825 826 827 828 829 830 831 832 833 |
{ struct inode *inode = file->f_mapping->host; int ret; unsigned int is_last = 0, is_data = 0; u16 cs_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits; u32 cpos, cend, clen, hole_size; u64 extoff, extlen; struct buffer_head *di_bh = NULL; struct ocfs2_extent_rec rec; |
965c8e59c lseek: the "whenc... |
834 |
BUG_ON(whence != SEEK_DATA && whence != SEEK_HOLE); |
93862d5e1 ocfs2: Implement ... |
835 836 837 838 839 840 841 842 |
ret = ocfs2_inode_lock(inode, &di_bh, 0); if (ret) { mlog_errno(ret); goto out; } down_read(&OCFS2_I(inode)->ip_alloc_sem); |
f17c20dd2 ocfs2: use i_size... |
843 |
if (*offset >= i_size_read(inode)) { |
93862d5e1 ocfs2: Implement ... |
844 845 846 847 848 |
ret = -ENXIO; goto out_unlock; } if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
965c8e59c lseek: the "whenc... |
849 |
if (whence == SEEK_HOLE) |
f17c20dd2 ocfs2: use i_size... |
850 |
*offset = i_size_read(inode); |
93862d5e1 ocfs2: Implement ... |
851 852 853 854 855 |
goto out_unlock; } clen = 0; cpos = *offset >> cs_bits; |
f17c20dd2 ocfs2: use i_size... |
856 |
cend = ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)); |
93862d5e1 ocfs2: Implement ... |
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 |
while (cpos < cend && !is_last) { ret = ocfs2_get_clusters_nocache(inode, di_bh, cpos, &hole_size, &rec, &is_last); if (ret) { mlog_errno(ret); goto out_unlock; } extoff = cpos; extoff <<= cs_bits; if (rec.e_blkno == 0ULL) { clen = hole_size; is_data = 0; } else { clen = le16_to_cpu(rec.e_leaf_clusters) - (cpos - le32_to_cpu(rec.e_cpos)); is_data = (rec.e_flags & OCFS2_EXT_UNWRITTEN) ? 0 : 1; } |
965c8e59c lseek: the "whenc... |
877 878 |
if ((!is_data && whence == SEEK_HOLE) || (is_data && whence == SEEK_DATA)) { |
93862d5e1 ocfs2: Implement ... |
879 880 881 882 883 884 885 886 |
if (extoff > *offset) *offset = extoff; goto out_unlock; } if (!is_last) cpos += clen; } |
965c8e59c lseek: the "whenc... |
887 |
if (whence == SEEK_HOLE) { |
93862d5e1 ocfs2: Implement ... |
888 889 890 891 |
extoff = cpos; extoff <<= cs_bits; extlen = clen; extlen <<= cs_bits; |
f17c20dd2 ocfs2: use i_size... |
892 893 |
if ((extoff + extlen) > i_size_read(inode)) extlen = i_size_read(inode) - extoff; |
93862d5e1 ocfs2: Implement ... |
894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 |
extoff += extlen; if (extoff > *offset) *offset = extoff; goto out_unlock; } ret = -ENXIO; out_unlock: brelse(di_bh); up_read(&OCFS2_I(inode)->ip_alloc_sem); ocfs2_inode_unlock(inode, 0); out: |
93862d5e1 ocfs2: Implement ... |
910 911 |
return ret; } |
a8549fb5a ocfs2: Wrap virtu... |
912 913 914 915 916 917 918 919 |
int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr, struct buffer_head *bhs[], int flags, int (*validate)(struct super_block *sb, struct buffer_head *bh)) { int rc = 0; u64 p_block, p_count; int i, count, done = 0; |
a716357c4 ocfs2: Remove mas... |
920 |
trace_ocfs2_read_virt_blocks( |
ef6b689b6 ocfs2: Remove ENT... |
921 922 |
inode, (unsigned long long)v_block, nr, bhs, flags, validate); |
a8549fb5a ocfs2: Wrap virtu... |
923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 |
if (((v_block + nr - 1) << inode->i_sb->s_blocksize_bits) >= i_size_read(inode)) { BUG_ON(!(flags & OCFS2_BH_READAHEAD)); goto out; } while (done < nr) { down_read(&OCFS2_I(inode)->ip_alloc_sem); rc = ocfs2_extent_map_get_blocks(inode, v_block + done, &p_block, &p_count, NULL); up_read(&OCFS2_I(inode)->ip_alloc_sem); if (rc) { mlog_errno(rc); break; } if (!p_block) { rc = -EIO; mlog(ML_ERROR, "Inode #%llu contains a hole at offset %llu ", (unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)(v_block + done) << inode->i_sb->s_blocksize_bits); break; } count = nr - done; if (p_count < count) count = p_count; /* * If the caller passed us bhs, they should have come * from a previous readahead call to this function. Thus, * they should have the right b_blocknr. */ for (i = 0; i < count; i++) { if (!bhs[done + i]) continue; BUG_ON(bhs[done + i]->b_blocknr != (p_block + i)); } |
8cb471e8f ocfs2: Take the i... |
965 966 |
rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, count, bhs + done, flags, validate); |
a8549fb5a ocfs2: Wrap virtu... |
967 968 969 970 971 972 973 974 |
if (rc) { mlog_errno(rc); break; } done += count; } out: |
a8549fb5a ocfs2: Wrap virtu... |
975 976 |
return rc; } |