1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * suballoc.c 4 * 5 * metadata alloc and free 6 * Inspired by ext3 block groups. 7 * 8 * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9 */ 10 11 #include <linux/fs.h> 12 #include <linux/types.h> 13 #include <linux/slab.h> 14 #include <linux/highmem.h> 15 16 #include <cluster/masklog.h> 17 18 #include "ocfs2.h" 19 20 #include "alloc.h" 21 #include "blockcheck.h" 22 #include "dlmglue.h" 23 #include "inode.h" 24 #include "journal.h" 25 #include "localalloc.h" 26 #include "suballoc.h" 27 #include "super.h" 28 #include "sysfile.h" 29 #include "uptodate.h" 30 #include "ocfs2_trace.h" 31 32 #include "buffer_head_io.h" 33 34 #define NOT_ALLOC_NEW_GROUP 0 35 #define ALLOC_NEW_GROUP 0x1 36 #define ALLOC_GROUPS_FROM_GLOBAL 0x2 37 38 #define OCFS2_MAX_TO_STEAL 1024 39 40 struct ocfs2_suballoc_result { 41 u64 sr_bg_blkno; /* The bg we allocated from. Set 42 to 0 when a block group is 43 contiguous. */ 44 u64 sr_bg_stable_blkno; /* 45 * Doesn't change, always 46 * set to target block 47 * group descriptor 48 * block. 49 */ 50 u64 sr_blkno; /* The first allocated block */ 51 unsigned int sr_bit_offset; /* The bit in the bg */ 52 unsigned int sr_bits; /* How many bits we claimed */ 53 }; 54 55 static u64 ocfs2_group_from_res(struct ocfs2_suballoc_result *res) 56 { 57 if (res->sr_blkno == 0) 58 return 0; 59 60 if (res->sr_bg_blkno) 61 return res->sr_bg_blkno; 62 63 return ocfs2_which_suballoc_group(res->sr_blkno, res->sr_bit_offset); 64 } 65 66 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl); 67 static int ocfs2_block_group_fill(handle_t *handle, 68 struct inode *alloc_inode, 69 struct buffer_head *bg_bh, 70 u64 group_blkno, 71 unsigned int group_clusters, 72 u16 my_chain, 73 struct ocfs2_chain_list *cl); 74 static int ocfs2_block_group_alloc(struct ocfs2_super *osb, 75 struct inode *alloc_inode, 76 struct buffer_head *bh, 77 u64 max_block, 78 u64 *last_alloc_group, 79 int flags); 80 81 static int ocfs2_cluster_group_search(struct inode *inode, 82 struct buffer_head *group_bh, 83 u32 bits_wanted, u32 min_bits, 84 u64 max_block, 85 struct ocfs2_suballoc_result *res); 86 static int ocfs2_block_group_search(struct inode *inode, 87 struct buffer_head *group_bh, 88 u32 bits_wanted, u32 min_bits, 89 u64 max_block, 90 struct ocfs2_suballoc_result *res); 91 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac, 92 handle_t *handle, 93 u32 bits_wanted, 94 u32 min_bits, 95 struct ocfs2_suballoc_result *res); 96 static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh, 97 int nr); 98 static int ocfs2_relink_block_group(handle_t *handle, 99 struct inode *alloc_inode, 100 struct buffer_head *fe_bh, 101 struct buffer_head *bg_bh, 102 struct buffer_head *prev_bg_bh, 103 u16 chain); 104 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg, 105 u32 wanted); 106 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode, 107 u64 bg_blkno, 108 u16 bg_bit_off); 109 static inline void ocfs2_block_to_cluster_group(struct inode *inode, 110 u64 data_blkno, 111 u64 *bg_blkno, 112 u16 *bg_bit_off); 113 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb, 114 u32 bits_wanted, u64 max_block, 115 int flags, 116 struct ocfs2_alloc_context **ac); 117 118 void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac) 119 { 120 struct inode *inode = ac->ac_inode; 121 122 if (inode) { 123 if (ac->ac_which != OCFS2_AC_USE_LOCAL) 124 ocfs2_inode_unlock(inode, 1); 125 126 inode_unlock(inode); 127 128 iput(inode); 129 ac->ac_inode = NULL; 130 } 131 brelse(ac->ac_bh); 132 ac->ac_bh = NULL; 133 ac->ac_resv = NULL; 134 kfree(ac->ac_find_loc_priv); 135 ac->ac_find_loc_priv = NULL; 136 } 137 138 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac) 139 { 140 ocfs2_free_ac_resource(ac); 141 kfree(ac); 142 } 143 144 static u32 ocfs2_bits_per_group(struct ocfs2_chain_list *cl) 145 { 146 return (u32)le16_to_cpu(cl->cl_cpg) * (u32)le16_to_cpu(cl->cl_bpc); 147 } 148 149 #define do_error(fmt, ...) \ 150 do { \ 151 if (resize) \ 152 mlog(ML_ERROR, fmt, ##__VA_ARGS__); \ 153 else \ 154 return ocfs2_error(sb, fmt, ##__VA_ARGS__); \ 155 } while (0) 156 157 static int ocfs2_validate_gd_self(struct super_block *sb, 158 struct buffer_head *bh, 159 int resize) 160 { 161 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; 162 163 if (!OCFS2_IS_VALID_GROUP_DESC(gd)) { 164 do_error("Group descriptor #%llu has bad signature %.*s\n", 165 (unsigned long long)bh->b_blocknr, 7, 166 gd->bg_signature); 167 } 168 169 if (le64_to_cpu(gd->bg_blkno) != bh->b_blocknr) { 170 do_error("Group descriptor #%llu has an invalid bg_blkno of %llu\n", 171 (unsigned long long)bh->b_blocknr, 172 (unsigned long long)le64_to_cpu(gd->bg_blkno)); 173 } 174 175 if (le32_to_cpu(gd->bg_generation) != OCFS2_SB(sb)->fs_generation) { 176 do_error("Group descriptor #%llu has an invalid fs_generation of #%u\n", 177 (unsigned long long)bh->b_blocknr, 178 le32_to_cpu(gd->bg_generation)); 179 } 180 181 if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) { 182 do_error("Group descriptor #%llu has bit count %u but claims that %u are free\n", 183 (unsigned long long)bh->b_blocknr, 184 le16_to_cpu(gd->bg_bits), 185 le16_to_cpu(gd->bg_free_bits_count)); 186 } 187 188 if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) { 189 do_error("Group descriptor #%llu has bit count %u but max bitmap bits of %u\n", 190 (unsigned long long)bh->b_blocknr, 191 le16_to_cpu(gd->bg_bits), 192 8 * le16_to_cpu(gd->bg_size)); 193 } 194 195 return 0; 196 } 197 198 static int ocfs2_validate_gd_parent(struct super_block *sb, 199 struct ocfs2_dinode *di, 200 struct buffer_head *bh, 201 int resize) 202 { 203 unsigned int max_bits; 204 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; 205 206 if (di->i_blkno != gd->bg_parent_dinode) { 207 do_error("Group descriptor #%llu has bad parent pointer (%llu, expected %llu)\n", 208 (unsigned long long)bh->b_blocknr, 209 (unsigned long long)le64_to_cpu(gd->bg_parent_dinode), 210 (unsigned long long)le64_to_cpu(di->i_blkno)); 211 } 212 213 max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc); 214 if (le16_to_cpu(gd->bg_bits) > max_bits) { 215 do_error("Group descriptor #%llu has bit count of %u\n", 216 (unsigned long long)bh->b_blocknr, 217 le16_to_cpu(gd->bg_bits)); 218 } 219 220 /* In resize, we may meet the case bg_chain == cl_next_free_rec. */ 221 if ((le16_to_cpu(gd->bg_chain) > 222 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) || 223 ((le16_to_cpu(gd->bg_chain) == 224 le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) && !resize)) { 225 do_error("Group descriptor #%llu has bad chain %u\n", 226 (unsigned long long)bh->b_blocknr, 227 le16_to_cpu(gd->bg_chain)); 228 } 229 230 return 0; 231 } 232 233 #undef do_error 234 235 /* 236 * This version only prints errors. It does not fail the filesystem, and 237 * exists only for resize. 238 */ 239 int ocfs2_check_group_descriptor(struct super_block *sb, 240 struct ocfs2_dinode *di, 241 struct buffer_head *bh) 242 { 243 int rc; 244 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; 245 246 BUG_ON(!buffer_uptodate(bh)); 247 248 /* 249 * If the ecc fails, we return the error but otherwise 250 * leave the filesystem running. We know any error is 251 * local to this block. 252 */ 253 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check); 254 if (rc) { 255 mlog(ML_ERROR, 256 "Checksum failed for group descriptor %llu\n", 257 (unsigned long long)bh->b_blocknr); 258 } else 259 rc = ocfs2_validate_gd_self(sb, bh, 1); 260 if (!rc) 261 rc = ocfs2_validate_gd_parent(sb, di, bh, 1); 262 263 return rc; 264 } 265 266 static int ocfs2_validate_group_descriptor(struct super_block *sb, 267 struct buffer_head *bh) 268 { 269 int rc; 270 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; 271 272 trace_ocfs2_validate_group_descriptor( 273 (unsigned long long)bh->b_blocknr); 274 275 BUG_ON(!buffer_uptodate(bh)); 276 277 /* 278 * If the ecc fails, we return the error but otherwise 279 * leave the filesystem running. We know any error is 280 * local to this block. 281 */ 282 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &gd->bg_check); 283 if (rc) 284 return rc; 285 286 /* 287 * Errors after here are fatal. 288 */ 289 290 return ocfs2_validate_gd_self(sb, bh, 0); 291 } 292 293 int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di, 294 u64 gd_blkno, struct buffer_head **bh) 295 { 296 int rc; 297 struct buffer_head *tmp = *bh; 298 299 rc = ocfs2_read_block(INODE_CACHE(inode), gd_blkno, &tmp, 300 ocfs2_validate_group_descriptor); 301 if (rc) 302 goto out; 303 304 rc = ocfs2_validate_gd_parent(inode->i_sb, di, tmp, 0); 305 if (rc) { 306 brelse(tmp); 307 goto out; 308 } 309 310 /* If ocfs2_read_block() got us a new bh, pass it up. */ 311 if (!*bh) 312 *bh = tmp; 313 314 out: 315 return rc; 316 } 317 318 static void ocfs2_bg_discontig_add_extent(struct ocfs2_super *osb, 319 struct ocfs2_group_desc *bg, 320 struct ocfs2_chain_list *cl, 321 u64 p_blkno, unsigned int clusters) 322 { 323 struct ocfs2_extent_list *el = &bg->bg_list; 324 struct ocfs2_extent_rec *rec; 325 326 BUG_ON(!ocfs2_supports_discontig_bg(osb)); 327 if (!el->l_next_free_rec) 328 el->l_count = cpu_to_le16(ocfs2_extent_recs_per_gd(osb->sb)); 329 rec = &el->l_recs[le16_to_cpu(el->l_next_free_rec)]; 330 rec->e_blkno = cpu_to_le64(p_blkno); 331 rec->e_cpos = cpu_to_le32(le16_to_cpu(bg->bg_bits) / 332 le16_to_cpu(cl->cl_bpc)); 333 rec->e_leaf_clusters = cpu_to_le16(clusters); 334 le16_add_cpu(&bg->bg_bits, clusters * le16_to_cpu(cl->cl_bpc)); 335 le16_add_cpu(&bg->bg_free_bits_count, 336 clusters * le16_to_cpu(cl->cl_bpc)); 337 le16_add_cpu(&el->l_next_free_rec, 1); 338 } 339 340 static int ocfs2_block_group_fill(handle_t *handle, 341 struct inode *alloc_inode, 342 struct buffer_head *bg_bh, 343 u64 group_blkno, 344 unsigned int group_clusters, 345 u16 my_chain, 346 struct ocfs2_chain_list *cl) 347 { 348 int status = 0; 349 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb); 350 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; 351 struct super_block * sb = alloc_inode->i_sb; 352 353 if (((unsigned long long) bg_bh->b_blocknr) != group_blkno) { 354 status = ocfs2_error(alloc_inode->i_sb, 355 "group block (%llu) != b_blocknr (%llu)\n", 356 (unsigned long long)group_blkno, 357 (unsigned long long) bg_bh->b_blocknr); 358 goto bail; 359 } 360 361 status = ocfs2_journal_access_gd(handle, 362 INODE_CACHE(alloc_inode), 363 bg_bh, 364 OCFS2_JOURNAL_ACCESS_CREATE); 365 if (status < 0) { 366 mlog_errno(status); 367 goto bail; 368 } 369 370 memset(bg, 0, sb->s_blocksize); 371 strcpy(bg->bg_signature, OCFS2_GROUP_DESC_SIGNATURE); 372 bg->bg_generation = cpu_to_le32(osb->fs_generation); 373 bg->bg_size = cpu_to_le16(ocfs2_group_bitmap_size(sb, 1, 374 osb->s_feature_incompat)); 375 bg->bg_chain = cpu_to_le16(my_chain); 376 bg->bg_next_group = cl->cl_recs[my_chain].c_blkno; 377 bg->bg_parent_dinode = cpu_to_le64(OCFS2_I(alloc_inode)->ip_blkno); 378 bg->bg_blkno = cpu_to_le64(group_blkno); 379 if (group_clusters == le16_to_cpu(cl->cl_cpg)) 380 bg->bg_bits = cpu_to_le16(ocfs2_bits_per_group(cl)); 381 else 382 ocfs2_bg_discontig_add_extent(osb, bg, cl, group_blkno, 383 group_clusters); 384 385 /* set the 1st bit in the bitmap to account for the descriptor block */ 386 ocfs2_set_bit(0, (unsigned long *)bg->bg_bitmap); 387 bg->bg_free_bits_count = cpu_to_le16(le16_to_cpu(bg->bg_bits) - 1); 388 389 ocfs2_journal_dirty(handle, bg_bh); 390 391 /* There is no need to zero out or otherwise initialize the 392 * other blocks in a group - All valid FS metadata in a block 393 * group stores the superblock fs_generation value at 394 * allocation time. */ 395 396 bail: 397 if (status) 398 mlog_errno(status); 399 return status; 400 } 401 402 static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl) 403 { 404 u16 curr, best; 405 406 best = curr = 0; 407 while (curr < le16_to_cpu(cl->cl_count)) { 408 if (le32_to_cpu(cl->cl_recs[best].c_total) > 409 le32_to_cpu(cl->cl_recs[curr].c_total)) 410 best = curr; 411 curr++; 412 } 413 return best; 414 } 415 416 static struct buffer_head * 417 ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle, 418 struct inode *alloc_inode, 419 struct ocfs2_alloc_context *ac, 420 struct ocfs2_chain_list *cl) 421 { 422 int status; 423 u32 bit_off, num_bits; 424 u64 bg_blkno; 425 struct buffer_head *bg_bh; 426 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl); 427 428 status = ocfs2_claim_clusters(handle, ac, 429 le16_to_cpu(cl->cl_cpg), &bit_off, 430 &num_bits); 431 if (status < 0) { 432 if (status != -ENOSPC) 433 mlog_errno(status); 434 goto bail; 435 } 436 437 /* setup the group */ 438 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off); 439 trace_ocfs2_block_group_alloc_contig( 440 (unsigned long long)bg_blkno, alloc_rec); 441 442 bg_bh = sb_getblk(osb->sb, bg_blkno); 443 if (!bg_bh) { 444 status = -ENOMEM; 445 mlog_errno(status); 446 goto bail; 447 } 448 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh); 449 450 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh, 451 bg_blkno, num_bits, alloc_rec, cl); 452 if (status < 0) { 453 brelse(bg_bh); 454 mlog_errno(status); 455 } 456 457 bail: 458 return status ? ERR_PTR(status) : bg_bh; 459 } 460 461 static int ocfs2_block_group_claim_bits(struct ocfs2_super *osb, 462 handle_t *handle, 463 struct ocfs2_alloc_context *ac, 464 unsigned int min_bits, 465 u32 *bit_off, u32 *num_bits) 466 { 467 int status = 0; 468 469 while (min_bits) { 470 status = ocfs2_claim_clusters(handle, ac, min_bits, 471 bit_off, num_bits); 472 if (status != -ENOSPC) 473 break; 474 475 min_bits >>= 1; 476 } 477 478 return status; 479 } 480 481 static int ocfs2_block_group_grow_discontig(handle_t *handle, 482 struct inode *alloc_inode, 483 struct buffer_head *bg_bh, 484 struct ocfs2_alloc_context *ac, 485 struct ocfs2_chain_list *cl, 486 unsigned int min_bits) 487 { 488 int status; 489 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb); 490 struct ocfs2_group_desc *bg = 491 (struct ocfs2_group_desc *)bg_bh->b_data; 492 unsigned int needed = le16_to_cpu(cl->cl_cpg) - 493 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc); 494 u32 p_cpos, clusters; 495 u64 p_blkno; 496 struct ocfs2_extent_list *el = &bg->bg_list; 497 498 status = ocfs2_journal_access_gd(handle, 499 INODE_CACHE(alloc_inode), 500 bg_bh, 501 OCFS2_JOURNAL_ACCESS_CREATE); 502 if (status < 0) { 503 mlog_errno(status); 504 goto bail; 505 } 506 507 while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) < 508 le16_to_cpu(el->l_count))) { 509 if (min_bits > needed) 510 min_bits = needed; 511 status = ocfs2_block_group_claim_bits(osb, handle, ac, 512 min_bits, &p_cpos, 513 &clusters); 514 if (status < 0) { 515 if (status != -ENOSPC) 516 mlog_errno(status); 517 goto bail; 518 } 519 p_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cpos); 520 ocfs2_bg_discontig_add_extent(osb, bg, cl, p_blkno, 521 clusters); 522 523 min_bits = clusters; 524 needed = le16_to_cpu(cl->cl_cpg) - 525 le16_to_cpu(bg->bg_bits) / le16_to_cpu(cl->cl_bpc); 526 } 527 528 if (needed > 0) { 529 /* 530 * We have used up all the extent rec but can't fill up 531 * the cpg. So bail out. 532 */ 533 status = -ENOSPC; 534 goto bail; 535 } 536 537 ocfs2_journal_dirty(handle, bg_bh); 538 539 bail: 540 return status; 541 } 542 543 static void ocfs2_bg_alloc_cleanup(handle_t *handle, 544 struct ocfs2_alloc_context *cluster_ac, 545 struct inode *alloc_inode, 546 struct buffer_head *bg_bh) 547 { 548 int i, ret; 549 struct ocfs2_group_desc *bg; 550 struct ocfs2_extent_list *el; 551 struct ocfs2_extent_rec *rec; 552 553 if (!bg_bh) 554 return; 555 556 bg = (struct ocfs2_group_desc *)bg_bh->b_data; 557 el = &bg->bg_list; 558 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) { 559 rec = &el->l_recs[i]; 560 ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode, 561 cluster_ac->ac_bh, 562 le64_to_cpu(rec->e_blkno), 563 le16_to_cpu(rec->e_leaf_clusters)); 564 if (ret) 565 mlog_errno(ret); 566 /* Try all the clusters to free */ 567 } 568 569 ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh); 570 brelse(bg_bh); 571 } 572 573 static struct buffer_head * 574 ocfs2_block_group_alloc_discontig(handle_t *handle, 575 struct inode *alloc_inode, 576 struct ocfs2_alloc_context *ac, 577 struct ocfs2_chain_list *cl) 578 { 579 int status; 580 u32 bit_off, num_bits; 581 u64 bg_blkno; 582 unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1; 583 struct buffer_head *bg_bh = NULL; 584 unsigned int alloc_rec = ocfs2_find_smallest_chain(cl); 585 struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb); 586 587 if (!ocfs2_supports_discontig_bg(osb)) { 588 status = -ENOSPC; 589 goto bail; 590 } 591 592 status = ocfs2_extend_trans(handle, 593 ocfs2_calc_bg_discontig_credits(osb->sb)); 594 if (status) { 595 mlog_errno(status); 596 goto bail; 597 } 598 599 /* 600 * We're going to be grabbing from multiple cluster groups. 601 * We don't have enough credits to relink them all, and the 602 * cluster groups will be staying in cache for the duration of 603 * this operation. 604 */ 605 ac->ac_disable_chain_relink = 1; 606 607 /* Claim the first region */ 608 status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits, 609 &bit_off, &num_bits); 610 if (status < 0) { 611 if (status != -ENOSPC) 612 mlog_errno(status); 613 goto bail; 614 } 615 min_bits = num_bits; 616 617 /* setup the group */ 618 bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off); 619 trace_ocfs2_block_group_alloc_discontig( 620 (unsigned long long)bg_blkno, alloc_rec); 621 622 bg_bh = sb_getblk(osb->sb, bg_blkno); 623 if (!bg_bh) { 624 status = -ENOMEM; 625 mlog_errno(status); 626 goto bail; 627 } 628 ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh); 629 630 status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh, 631 bg_blkno, num_bits, alloc_rec, cl); 632 if (status < 0) { 633 mlog_errno(status); 634 goto bail; 635 } 636 637 status = ocfs2_block_group_grow_discontig(handle, alloc_inode, 638 bg_bh, ac, cl, min_bits); 639 if (status) 640 mlog_errno(status); 641 642 bail: 643 if (status) 644 ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh); 645 return status ? ERR_PTR(status) : bg_bh; 646 } 647 648 /* 649 * We expect the block group allocator to already be locked. 650 */ 651 static int ocfs2_block_group_alloc(struct ocfs2_super *osb, 652 struct inode *alloc_inode, 653 struct buffer_head *bh, 654 u64 max_block, 655 u64 *last_alloc_group, 656 int flags) 657 { 658 int status, credits; 659 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data; 660 struct ocfs2_chain_list *cl; 661 struct ocfs2_alloc_context *ac = NULL; 662 handle_t *handle = NULL; 663 u16 alloc_rec; 664 struct buffer_head *bg_bh = NULL; 665 struct ocfs2_group_desc *bg; 666 667 BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode)); 668 669 cl = &fe->id2.i_chain; 670 status = ocfs2_reserve_clusters_with_limit(osb, 671 le16_to_cpu(cl->cl_cpg), 672 max_block, flags, &ac); 673 if (status < 0) { 674 if (status != -ENOSPC) 675 mlog_errno(status); 676 goto bail; 677 } 678 679 credits = ocfs2_calc_group_alloc_credits(osb->sb, 680 le16_to_cpu(cl->cl_cpg)); 681 handle = ocfs2_start_trans(osb, credits); 682 if (IS_ERR(handle)) { 683 status = PTR_ERR(handle); 684 handle = NULL; 685 mlog_errno(status); 686 goto bail; 687 } 688 689 if (last_alloc_group && *last_alloc_group != 0) { 690 trace_ocfs2_block_group_alloc( 691 (unsigned long long)*last_alloc_group); 692 ac->ac_last_group = *last_alloc_group; 693 } 694 695 bg_bh = ocfs2_block_group_alloc_contig(osb, handle, alloc_inode, 696 ac, cl); 697 if (PTR_ERR(bg_bh) == -ENOSPC) 698 bg_bh = ocfs2_block_group_alloc_discontig(handle, 699 alloc_inode, 700 ac, cl); 701 if (IS_ERR(bg_bh)) { 702 status = PTR_ERR(bg_bh); 703 bg_bh = NULL; 704 if (status != -ENOSPC) 705 mlog_errno(status); 706 goto bail; 707 } 708 bg = (struct ocfs2_group_desc *) bg_bh->b_data; 709 710 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode), 711 bh, OCFS2_JOURNAL_ACCESS_WRITE); 712 if (status < 0) { 713 mlog_errno(status); 714 goto bail; 715 } 716 717 alloc_rec = le16_to_cpu(bg->bg_chain); 718 le32_add_cpu(&cl->cl_recs[alloc_rec].c_free, 719 le16_to_cpu(bg->bg_free_bits_count)); 720 le32_add_cpu(&cl->cl_recs[alloc_rec].c_total, 721 le16_to_cpu(bg->bg_bits)); 722 cl->cl_recs[alloc_rec].c_blkno = bg->bg_blkno; 723 if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count)) 724 le16_add_cpu(&cl->cl_next_free_rec, 1); 725 726 le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) - 727 le16_to_cpu(bg->bg_free_bits_count)); 728 le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits)); 729 le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg)); 730 731 ocfs2_journal_dirty(handle, bh); 732 733 spin_lock(&OCFS2_I(alloc_inode)->ip_lock); 734 OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters); 735 fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb, 736 le32_to_cpu(fe->i_clusters))); 737 spin_unlock(&OCFS2_I(alloc_inode)->ip_lock); 738 i_size_write(alloc_inode, le64_to_cpu(fe->i_size)); 739 alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode); 740 ocfs2_update_inode_fsync_trans(handle, alloc_inode, 0); 741 742 status = 0; 743 744 /* save the new last alloc group so that the caller can cache it. */ 745 if (last_alloc_group) 746 *last_alloc_group = ac->ac_last_group; 747 748 bail: 749 if (handle) 750 ocfs2_commit_trans(osb, handle); 751 752 if (ac) 753 ocfs2_free_alloc_context(ac); 754 755 brelse(bg_bh); 756 757 if (status) 758 mlog_errno(status); 759 return status; 760 } 761 762 static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb, 763 struct ocfs2_alloc_context *ac, 764 int type, 765 u32 slot, 766 u64 *last_alloc_group, 767 int flags) 768 { 769 int status; 770 u32 bits_wanted = ac->ac_bits_wanted; 771 struct inode *alloc_inode; 772 struct buffer_head *bh = NULL; 773 struct ocfs2_dinode *fe; 774 u32 free_bits; 775 776 alloc_inode = ocfs2_get_system_file_inode(osb, type, slot); 777 if (!alloc_inode) { 778 mlog_errno(-EINVAL); 779 return -EINVAL; 780 } 781 782 inode_lock(alloc_inode); 783 784 status = ocfs2_inode_lock(alloc_inode, &bh, 1); 785 if (status < 0) { 786 inode_unlock(alloc_inode); 787 iput(alloc_inode); 788 789 mlog_errno(status); 790 return status; 791 } 792 793 ac->ac_inode = alloc_inode; 794 ac->ac_alloc_slot = slot; 795 796 fe = (struct ocfs2_dinode *) bh->b_data; 797 798 /* The bh was validated by the inode read inside 799 * ocfs2_inode_lock(). Any corruption is a code bug. */ 800 BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); 801 802 if (!(fe->i_flags & cpu_to_le32(OCFS2_CHAIN_FL))) { 803 status = ocfs2_error(alloc_inode->i_sb, 804 "Invalid chain allocator %llu\n", 805 (unsigned long long)le64_to_cpu(fe->i_blkno)); 806 goto bail; 807 } 808 809 free_bits = le32_to_cpu(fe->id1.bitmap1.i_total) - 810 le32_to_cpu(fe->id1.bitmap1.i_used); 811 812 if (bits_wanted > free_bits) { 813 /* cluster bitmap never grows */ 814 if (ocfs2_is_cluster_bitmap(alloc_inode)) { 815 trace_ocfs2_reserve_suballoc_bits_nospc(bits_wanted, 816 free_bits); 817 status = -ENOSPC; 818 goto bail; 819 } 820 821 if (!(flags & ALLOC_NEW_GROUP)) { 822 trace_ocfs2_reserve_suballoc_bits_no_new_group( 823 slot, bits_wanted, free_bits); 824 status = -ENOSPC; 825 goto bail; 826 } 827 828 status = ocfs2_block_group_alloc(osb, alloc_inode, bh, 829 ac->ac_max_block, 830 last_alloc_group, flags); 831 if (status < 0) { 832 if (status != -ENOSPC) 833 mlog_errno(status); 834 goto bail; 835 } 836 atomic_inc(&osb->alloc_stats.bg_extends); 837 838 /* You should never ask for this much metadata */ 839 BUG_ON(bits_wanted > 840 (le32_to_cpu(fe->id1.bitmap1.i_total) 841 - le32_to_cpu(fe->id1.bitmap1.i_used))); 842 } 843 844 get_bh(bh); 845 ac->ac_bh = bh; 846 bail: 847 brelse(bh); 848 849 if (status) 850 mlog_errno(status); 851 return status; 852 } 853 854 static void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb) 855 { 856 spin_lock(&osb->osb_lock); 857 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT; 858 spin_unlock(&osb->osb_lock); 859 atomic_set(&osb->s_num_inodes_stolen, 0); 860 } 861 862 static void ocfs2_init_meta_steal_slot(struct ocfs2_super *osb) 863 { 864 spin_lock(&osb->osb_lock); 865 osb->s_meta_steal_slot = OCFS2_INVALID_SLOT; 866 spin_unlock(&osb->osb_lock); 867 atomic_set(&osb->s_num_meta_stolen, 0); 868 } 869 870 void ocfs2_init_steal_slots(struct ocfs2_super *osb) 871 { 872 ocfs2_init_inode_steal_slot(osb); 873 ocfs2_init_meta_steal_slot(osb); 874 } 875 876 static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type) 877 { 878 spin_lock(&osb->osb_lock); 879 if (type == INODE_ALLOC_SYSTEM_INODE) 880 osb->s_inode_steal_slot = (u16)slot; 881 else if (type == EXTENT_ALLOC_SYSTEM_INODE) 882 osb->s_meta_steal_slot = (u16)slot; 883 spin_unlock(&osb->osb_lock); 884 } 885 886 static int __ocfs2_get_steal_slot(struct ocfs2_super *osb, int type) 887 { 888 int slot = OCFS2_INVALID_SLOT; 889 890 spin_lock(&osb->osb_lock); 891 if (type == INODE_ALLOC_SYSTEM_INODE) 892 slot = osb->s_inode_steal_slot; 893 else if (type == EXTENT_ALLOC_SYSTEM_INODE) 894 slot = osb->s_meta_steal_slot; 895 spin_unlock(&osb->osb_lock); 896 897 return slot; 898 } 899 900 static int ocfs2_get_inode_steal_slot(struct ocfs2_super *osb) 901 { 902 return __ocfs2_get_steal_slot(osb, INODE_ALLOC_SYSTEM_INODE); 903 } 904 905 static int ocfs2_get_meta_steal_slot(struct ocfs2_super *osb) 906 { 907 return __ocfs2_get_steal_slot(osb, EXTENT_ALLOC_SYSTEM_INODE); 908 } 909 910 static int ocfs2_steal_resource(struct ocfs2_super *osb, 911 struct ocfs2_alloc_context *ac, 912 int type) 913 { 914 int i, status = -ENOSPC; 915 int slot = __ocfs2_get_steal_slot(osb, type); 916 917 /* Start to steal resource from the first slot after ours. */ 918 if (slot == OCFS2_INVALID_SLOT) 919 slot = osb->slot_num + 1; 920 921 for (i = 0; i < osb->max_slots; i++, slot++) { 922 if (slot == osb->max_slots) 923 slot = 0; 924 925 if (slot == osb->slot_num) 926 continue; 927 928 status = ocfs2_reserve_suballoc_bits(osb, ac, 929 type, 930 (u32)slot, NULL, 931 NOT_ALLOC_NEW_GROUP); 932 if (status >= 0) { 933 __ocfs2_set_steal_slot(osb, slot, type); 934 break; 935 } 936 937 ocfs2_free_ac_resource(ac); 938 } 939 940 return status; 941 } 942 943 static int ocfs2_steal_inode(struct ocfs2_super *osb, 944 struct ocfs2_alloc_context *ac) 945 { 946 return ocfs2_steal_resource(osb, ac, INODE_ALLOC_SYSTEM_INODE); 947 } 948 949 static int ocfs2_steal_meta(struct ocfs2_super *osb, 950 struct ocfs2_alloc_context *ac) 951 { 952 return ocfs2_steal_resource(osb, ac, EXTENT_ALLOC_SYSTEM_INODE); 953 } 954 955 int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb, 956 int blocks, 957 struct ocfs2_alloc_context **ac) 958 { 959 int status; 960 int slot = ocfs2_get_meta_steal_slot(osb); 961 962 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL); 963 if (!(*ac)) { 964 status = -ENOMEM; 965 mlog_errno(status); 966 goto bail; 967 } 968 969 (*ac)->ac_bits_wanted = blocks; 970 (*ac)->ac_which = OCFS2_AC_USE_META; 971 (*ac)->ac_group_search = ocfs2_block_group_search; 972 973 if (slot != OCFS2_INVALID_SLOT && 974 atomic_read(&osb->s_num_meta_stolen) < OCFS2_MAX_TO_STEAL) 975 goto extent_steal; 976 977 atomic_set(&osb->s_num_meta_stolen, 0); 978 status = ocfs2_reserve_suballoc_bits(osb, (*ac), 979 EXTENT_ALLOC_SYSTEM_INODE, 980 (u32)osb->slot_num, NULL, 981 ALLOC_GROUPS_FROM_GLOBAL|ALLOC_NEW_GROUP); 982 983 984 if (status >= 0) { 985 status = 0; 986 if (slot != OCFS2_INVALID_SLOT) 987 ocfs2_init_meta_steal_slot(osb); 988 goto bail; 989 } else if (status < 0 && status != -ENOSPC) { 990 mlog_errno(status); 991 goto bail; 992 } 993 994 ocfs2_free_ac_resource(*ac); 995 996 extent_steal: 997 status = ocfs2_steal_meta(osb, *ac); 998 atomic_inc(&osb->s_num_meta_stolen); 999 if (status < 0) { 1000 if (status != -ENOSPC) 1001 mlog_errno(status); 1002 goto bail; 1003 } 1004 1005 status = 0; 1006 bail: 1007 if ((status < 0) && *ac) { 1008 ocfs2_free_alloc_context(*ac); 1009 *ac = NULL; 1010 } 1011 1012 if (status) 1013 mlog_errno(status); 1014 return status; 1015 } 1016 1017 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb, 1018 struct ocfs2_extent_list *root_el, 1019 struct ocfs2_alloc_context **ac) 1020 { 1021 return ocfs2_reserve_new_metadata_blocks(osb, 1022 ocfs2_extend_meta_needed(root_el), 1023 ac); 1024 } 1025 1026 int ocfs2_reserve_new_inode(struct ocfs2_super *osb, 1027 struct ocfs2_alloc_context **ac) 1028 { 1029 int status; 1030 int slot = ocfs2_get_inode_steal_slot(osb); 1031 u64 alloc_group; 1032 1033 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL); 1034 if (!(*ac)) { 1035 status = -ENOMEM; 1036 mlog_errno(status); 1037 goto bail; 1038 } 1039 1040 (*ac)->ac_bits_wanted = 1; 1041 (*ac)->ac_which = OCFS2_AC_USE_INODE; 1042 1043 (*ac)->ac_group_search = ocfs2_block_group_search; 1044 1045 /* 1046 * stat(2) can't handle i_ino > 32bits, so we tell the 1047 * lower levels not to allocate us a block group past that 1048 * limit. The 'inode64' mount option avoids this behavior. 1049 */ 1050 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64)) 1051 (*ac)->ac_max_block = (u32)~0U; 1052 1053 /* 1054 * slot is set when we successfully steal inode from other nodes. 1055 * It is reset in 3 places: 1056 * 1. when we flush the truncate log 1057 * 2. when we complete local alloc recovery. 1058 * 3. when we successfully allocate from our own slot. 1059 * After it is set, we will go on stealing inodes until we find the 1060 * need to check our slots to see whether there is some space for us. 1061 */ 1062 if (slot != OCFS2_INVALID_SLOT && 1063 atomic_read(&osb->s_num_inodes_stolen) < OCFS2_MAX_TO_STEAL) 1064 goto inode_steal; 1065 1066 atomic_set(&osb->s_num_inodes_stolen, 0); 1067 alloc_group = osb->osb_inode_alloc_group; 1068 status = ocfs2_reserve_suballoc_bits(osb, *ac, 1069 INODE_ALLOC_SYSTEM_INODE, 1070 (u32)osb->slot_num, 1071 &alloc_group, 1072 ALLOC_NEW_GROUP | 1073 ALLOC_GROUPS_FROM_GLOBAL); 1074 if (status >= 0) { 1075 status = 0; 1076 1077 spin_lock(&osb->osb_lock); 1078 osb->osb_inode_alloc_group = alloc_group; 1079 spin_unlock(&osb->osb_lock); 1080 trace_ocfs2_reserve_new_inode_new_group( 1081 (unsigned long long)alloc_group); 1082 1083 /* 1084 * Some inodes must be freed by us, so try to allocate 1085 * from our own next time. 1086 */ 1087 if (slot != OCFS2_INVALID_SLOT) 1088 ocfs2_init_inode_steal_slot(osb); 1089 goto bail; 1090 } else if (status < 0 && status != -ENOSPC) { 1091 mlog_errno(status); 1092 goto bail; 1093 } 1094 1095 ocfs2_free_ac_resource(*ac); 1096 1097 inode_steal: 1098 status = ocfs2_steal_inode(osb, *ac); 1099 atomic_inc(&osb->s_num_inodes_stolen); 1100 if (status < 0) { 1101 if (status != -ENOSPC) 1102 mlog_errno(status); 1103 goto bail; 1104 } 1105 1106 status = 0; 1107 bail: 1108 if ((status < 0) && *ac) { 1109 ocfs2_free_alloc_context(*ac); 1110 *ac = NULL; 1111 } 1112 1113 if (status) 1114 mlog_errno(status); 1115 return status; 1116 } 1117 1118 /* local alloc code has to do the same thing, so rather than do this 1119 * twice.. */ 1120 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb, 1121 struct ocfs2_alloc_context *ac) 1122 { 1123 int status; 1124 1125 ac->ac_which = OCFS2_AC_USE_MAIN; 1126 ac->ac_group_search = ocfs2_cluster_group_search; 1127 1128 status = ocfs2_reserve_suballoc_bits(osb, ac, 1129 GLOBAL_BITMAP_SYSTEM_INODE, 1130 OCFS2_INVALID_SLOT, NULL, 1131 ALLOC_NEW_GROUP); 1132 if (status < 0 && status != -ENOSPC) 1133 mlog_errno(status); 1134 1135 return status; 1136 } 1137 1138 /* Callers don't need to care which bitmap (local alloc or main) to 1139 * use so we figure it out for them, but unfortunately this clutters 1140 * things a bit. */ 1141 static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb, 1142 u32 bits_wanted, u64 max_block, 1143 int flags, 1144 struct ocfs2_alloc_context **ac) 1145 { 1146 int status, ret = 0; 1147 int retried = 0; 1148 1149 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL); 1150 if (!(*ac)) { 1151 status = -ENOMEM; 1152 mlog_errno(status); 1153 goto bail; 1154 } 1155 1156 (*ac)->ac_bits_wanted = bits_wanted; 1157 (*ac)->ac_max_block = max_block; 1158 1159 status = -ENOSPC; 1160 if (!(flags & ALLOC_GROUPS_FROM_GLOBAL) && 1161 ocfs2_alloc_should_use_local(osb, bits_wanted)) { 1162 status = ocfs2_reserve_local_alloc_bits(osb, 1163 bits_wanted, 1164 *ac); 1165 if ((status < 0) && (status != -ENOSPC)) { 1166 mlog_errno(status); 1167 goto bail; 1168 } 1169 } 1170 1171 if (status == -ENOSPC) { 1172 retry: 1173 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac); 1174 /* Retry if there is sufficient space cached in truncate log */ 1175 if (status == -ENOSPC && !retried) { 1176 retried = 1; 1177 ocfs2_inode_unlock((*ac)->ac_inode, 1); 1178 inode_unlock((*ac)->ac_inode); 1179 1180 ret = ocfs2_try_to_free_truncate_log(osb, bits_wanted); 1181 if (ret == 1) { 1182 iput((*ac)->ac_inode); 1183 (*ac)->ac_inode = NULL; 1184 goto retry; 1185 } 1186 1187 if (ret < 0) 1188 mlog_errno(ret); 1189 1190 inode_lock((*ac)->ac_inode); 1191 ret = ocfs2_inode_lock((*ac)->ac_inode, NULL, 1); 1192 if (ret < 0) { 1193 mlog_errno(ret); 1194 inode_unlock((*ac)->ac_inode); 1195 iput((*ac)->ac_inode); 1196 (*ac)->ac_inode = NULL; 1197 goto bail; 1198 } 1199 } 1200 if (status < 0) { 1201 if (status != -ENOSPC) 1202 mlog_errno(status); 1203 goto bail; 1204 } 1205 } 1206 1207 status = 0; 1208 bail: 1209 if ((status < 0) && *ac) { 1210 ocfs2_free_alloc_context(*ac); 1211 *ac = NULL; 1212 } 1213 1214 if (status) 1215 mlog_errno(status); 1216 return status; 1217 } 1218 1219 int ocfs2_reserve_clusters(struct ocfs2_super *osb, 1220 u32 bits_wanted, 1221 struct ocfs2_alloc_context **ac) 1222 { 1223 return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0, 1224 ALLOC_NEW_GROUP, ac); 1225 } 1226 1227 /* 1228 * More or less lifted from ext3. I'll leave their description below: 1229 * 1230 * "For ext3 allocations, we must not reuse any blocks which are 1231 * allocated in the bitmap buffer's "last committed data" copy. This 1232 * prevents deletes from freeing up the page for reuse until we have 1233 * committed the delete transaction. 1234 * 1235 * If we didn't do this, then deleting something and reallocating it as 1236 * data would allow the old block to be overwritten before the 1237 * transaction committed (because we force data to disk before commit). 1238 * This would lead to corruption if we crashed between overwriting the 1239 * data and committing the delete. 1240 * 1241 * @@@ We may want to make this allocation behaviour conditional on 1242 * data-writes at some point, and disable it for metadata allocations or 1243 * sync-data inodes." 1244 * 1245 * Note: OCFS2 already does this differently for metadata vs data 1246 * allocations, as those bitmaps are separate and undo access is never 1247 * called on a metadata group descriptor. 1248 */ 1249 static int ocfs2_test_bg_bit_allocatable(struct buffer_head *bg_bh, 1250 int nr) 1251 { 1252 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; 1253 struct journal_head *jh; 1254 int ret; 1255 1256 if (ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap)) 1257 return 0; 1258 1259 jh = jbd2_journal_grab_journal_head(bg_bh); 1260 if (!jh) 1261 return 1; 1262 1263 spin_lock(&jh->b_state_lock); 1264 bg = (struct ocfs2_group_desc *) jh->b_committed_data; 1265 if (bg) 1266 ret = !ocfs2_test_bit(nr, (unsigned long *)bg->bg_bitmap); 1267 else 1268 ret = 1; 1269 spin_unlock(&jh->b_state_lock); 1270 jbd2_journal_put_journal_head(jh); 1271 1272 return ret; 1273 } 1274 1275 static int ocfs2_block_group_find_clear_bits(struct ocfs2_super *osb, 1276 struct buffer_head *bg_bh, 1277 unsigned int bits_wanted, 1278 unsigned int total_bits, 1279 struct ocfs2_suballoc_result *res) 1280 { 1281 void *bitmap; 1282 u16 best_offset, best_size; 1283 int offset, start, found, status = 0; 1284 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; 1285 1286 /* Callers got this descriptor from 1287 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */ 1288 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg)); 1289 1290 found = start = best_offset = best_size = 0; 1291 bitmap = bg->bg_bitmap; 1292 1293 while((offset = ocfs2_find_next_zero_bit(bitmap, total_bits, start)) != -1) { 1294 if (offset == total_bits) 1295 break; 1296 1297 if (!ocfs2_test_bg_bit_allocatable(bg_bh, offset)) { 1298 /* We found a zero, but we can't use it as it 1299 * hasn't been put to disk yet! */ 1300 found = 0; 1301 start = offset + 1; 1302 } else if (offset == start) { 1303 /* we found a zero */ 1304 found++; 1305 /* move start to the next bit to test */ 1306 start++; 1307 } else { 1308 /* got a zero after some ones */ 1309 found = 1; 1310 start = offset + 1; 1311 } 1312 if (found > best_size) { 1313 best_size = found; 1314 best_offset = start - found; 1315 } 1316 /* we got everything we needed */ 1317 if (found == bits_wanted) { 1318 /* mlog(0, "Found it all!\n"); */ 1319 break; 1320 } 1321 } 1322 1323 if (best_size) { 1324 res->sr_bit_offset = best_offset; 1325 res->sr_bits = best_size; 1326 } else { 1327 status = -ENOSPC; 1328 /* No error log here -- see the comment above 1329 * ocfs2_test_bg_bit_allocatable */ 1330 } 1331 1332 return status; 1333 } 1334 1335 int ocfs2_block_group_set_bits(handle_t *handle, 1336 struct inode *alloc_inode, 1337 struct ocfs2_group_desc *bg, 1338 struct buffer_head *group_bh, 1339 unsigned int bit_off, 1340 unsigned int num_bits) 1341 { 1342 int status; 1343 void *bitmap = bg->bg_bitmap; 1344 int journal_type = OCFS2_JOURNAL_ACCESS_WRITE; 1345 1346 /* All callers get the descriptor via 1347 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */ 1348 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg)); 1349 BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits); 1350 1351 trace_ocfs2_block_group_set_bits(bit_off, num_bits); 1352 1353 if (ocfs2_is_cluster_bitmap(alloc_inode)) 1354 journal_type = OCFS2_JOURNAL_ACCESS_UNDO; 1355 1356 status = ocfs2_journal_access_gd(handle, 1357 INODE_CACHE(alloc_inode), 1358 group_bh, 1359 journal_type); 1360 if (status < 0) { 1361 mlog_errno(status); 1362 goto bail; 1363 } 1364 1365 le16_add_cpu(&bg->bg_free_bits_count, -num_bits); 1366 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) { 1367 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n", 1368 (unsigned long long)le64_to_cpu(bg->bg_blkno), 1369 le16_to_cpu(bg->bg_bits), 1370 le16_to_cpu(bg->bg_free_bits_count), 1371 num_bits); 1372 } 1373 while(num_bits--) 1374 ocfs2_set_bit(bit_off++, bitmap); 1375 1376 ocfs2_journal_dirty(handle, group_bh); 1377 1378 bail: 1379 return status; 1380 } 1381 1382 /* find the one with the most empty bits */ 1383 static inline u16 ocfs2_find_victim_chain(struct ocfs2_chain_list *cl) 1384 { 1385 u16 curr, best; 1386 1387 BUG_ON(!cl->cl_next_free_rec); 1388 1389 best = curr = 0; 1390 while (curr < le16_to_cpu(cl->cl_next_free_rec)) { 1391 if (le32_to_cpu(cl->cl_recs[curr].c_free) > 1392 le32_to_cpu(cl->cl_recs[best].c_free)) 1393 best = curr; 1394 curr++; 1395 } 1396 1397 BUG_ON(best >= le16_to_cpu(cl->cl_next_free_rec)); 1398 return best; 1399 } 1400 1401 static int ocfs2_relink_block_group(handle_t *handle, 1402 struct inode *alloc_inode, 1403 struct buffer_head *fe_bh, 1404 struct buffer_head *bg_bh, 1405 struct buffer_head *prev_bg_bh, 1406 u16 chain) 1407 { 1408 int status; 1409 /* there is a really tiny chance the journal calls could fail, 1410 * but we wouldn't want inconsistent blocks in *any* case. */ 1411 u64 bg_ptr, prev_bg_ptr; 1412 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; 1413 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) bg_bh->b_data; 1414 struct ocfs2_group_desc *prev_bg = (struct ocfs2_group_desc *) prev_bg_bh->b_data; 1415 1416 /* The caller got these descriptors from 1417 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */ 1418 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg)); 1419 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(prev_bg)); 1420 1421 trace_ocfs2_relink_block_group( 1422 (unsigned long long)le64_to_cpu(fe->i_blkno), chain, 1423 (unsigned long long)le64_to_cpu(bg->bg_blkno), 1424 (unsigned long long)le64_to_cpu(prev_bg->bg_blkno)); 1425 1426 bg_ptr = le64_to_cpu(bg->bg_next_group); 1427 prev_bg_ptr = le64_to_cpu(prev_bg->bg_next_group); 1428 1429 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode), 1430 prev_bg_bh, 1431 OCFS2_JOURNAL_ACCESS_WRITE); 1432 if (status < 0) 1433 goto out; 1434 1435 prev_bg->bg_next_group = bg->bg_next_group; 1436 ocfs2_journal_dirty(handle, prev_bg_bh); 1437 1438 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode), 1439 bg_bh, OCFS2_JOURNAL_ACCESS_WRITE); 1440 if (status < 0) 1441 goto out_rollback_prev_bg; 1442 1443 bg->bg_next_group = fe->id2.i_chain.cl_recs[chain].c_blkno; 1444 ocfs2_journal_dirty(handle, bg_bh); 1445 1446 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode), 1447 fe_bh, OCFS2_JOURNAL_ACCESS_WRITE); 1448 if (status < 0) 1449 goto out_rollback_bg; 1450 1451 fe->id2.i_chain.cl_recs[chain].c_blkno = bg->bg_blkno; 1452 ocfs2_journal_dirty(handle, fe_bh); 1453 1454 out: 1455 if (status < 0) 1456 mlog_errno(status); 1457 return status; 1458 1459 out_rollback_bg: 1460 bg->bg_next_group = cpu_to_le64(bg_ptr); 1461 out_rollback_prev_bg: 1462 prev_bg->bg_next_group = cpu_to_le64(prev_bg_ptr); 1463 goto out; 1464 } 1465 1466 static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg, 1467 u32 wanted) 1468 { 1469 return le16_to_cpu(bg->bg_free_bits_count) > wanted; 1470 } 1471 1472 /* return 0 on success, -ENOSPC to keep searching and any other < 0 1473 * value on error. */ 1474 static int ocfs2_cluster_group_search(struct inode *inode, 1475 struct buffer_head *group_bh, 1476 u32 bits_wanted, u32 min_bits, 1477 u64 max_block, 1478 struct ocfs2_suballoc_result *res) 1479 { 1480 int search = -ENOSPC; 1481 int ret; 1482 u64 blkoff; 1483 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data; 1484 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1485 unsigned int max_bits, gd_cluster_off; 1486 1487 BUG_ON(!ocfs2_is_cluster_bitmap(inode)); 1488 1489 if (gd->bg_free_bits_count) { 1490 max_bits = le16_to_cpu(gd->bg_bits); 1491 1492 /* Tail groups in cluster bitmaps which aren't cpg 1493 * aligned are prone to partial extension by a failed 1494 * fs resize. If the file system resize never got to 1495 * update the dinode cluster count, then we don't want 1496 * to trust any clusters past it, regardless of what 1497 * the group descriptor says. */ 1498 gd_cluster_off = ocfs2_blocks_to_clusters(inode->i_sb, 1499 le64_to_cpu(gd->bg_blkno)); 1500 if ((gd_cluster_off + max_bits) > 1501 OCFS2_I(inode)->ip_clusters) { 1502 max_bits = OCFS2_I(inode)->ip_clusters - gd_cluster_off; 1503 trace_ocfs2_cluster_group_search_wrong_max_bits( 1504 (unsigned long long)le64_to_cpu(gd->bg_blkno), 1505 le16_to_cpu(gd->bg_bits), 1506 OCFS2_I(inode)->ip_clusters, max_bits); 1507 } 1508 1509 ret = ocfs2_block_group_find_clear_bits(osb, 1510 group_bh, bits_wanted, 1511 max_bits, res); 1512 if (ret) 1513 return ret; 1514 1515 if (max_block) { 1516 blkoff = ocfs2_clusters_to_blocks(inode->i_sb, 1517 gd_cluster_off + 1518 res->sr_bit_offset + 1519 res->sr_bits); 1520 trace_ocfs2_cluster_group_search_max_block( 1521 (unsigned long long)blkoff, 1522 (unsigned long long)max_block); 1523 if (blkoff > max_block) 1524 return -ENOSPC; 1525 } 1526 1527 /* ocfs2_block_group_find_clear_bits() might 1528 * return success, but we still want to return 1529 * -ENOSPC unless it found the minimum number 1530 * of bits. */ 1531 if (min_bits <= res->sr_bits) 1532 search = 0; /* success */ 1533 else if (res->sr_bits) { 1534 /* 1535 * Don't show bits which we'll be returning 1536 * for allocation to the local alloc bitmap. 1537 */ 1538 ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits); 1539 } 1540 } 1541 1542 return search; 1543 } 1544 1545 static int ocfs2_block_group_search(struct inode *inode, 1546 struct buffer_head *group_bh, 1547 u32 bits_wanted, u32 min_bits, 1548 u64 max_block, 1549 struct ocfs2_suballoc_result *res) 1550 { 1551 int ret = -ENOSPC; 1552 u64 blkoff; 1553 struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data; 1554 1555 BUG_ON(min_bits != 1); 1556 BUG_ON(ocfs2_is_cluster_bitmap(inode)); 1557 1558 if (bg->bg_free_bits_count) { 1559 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb), 1560 group_bh, bits_wanted, 1561 le16_to_cpu(bg->bg_bits), 1562 res); 1563 if (!ret && max_block) { 1564 blkoff = le64_to_cpu(bg->bg_blkno) + 1565 res->sr_bit_offset + res->sr_bits; 1566 trace_ocfs2_block_group_search_max_block( 1567 (unsigned long long)blkoff, 1568 (unsigned long long)max_block); 1569 if (blkoff > max_block) 1570 ret = -ENOSPC; 1571 } 1572 } 1573 1574 return ret; 1575 } 1576 1577 int ocfs2_alloc_dinode_update_counts(struct inode *inode, 1578 handle_t *handle, 1579 struct buffer_head *di_bh, 1580 u32 num_bits, 1581 u16 chain) 1582 { 1583 int ret; 1584 u32 tmp_used; 1585 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data; 1586 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain; 1587 1588 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, 1589 OCFS2_JOURNAL_ACCESS_WRITE); 1590 if (ret < 0) { 1591 mlog_errno(ret); 1592 goto out; 1593 } 1594 1595 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used); 1596 di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used); 1597 le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits); 1598 ocfs2_journal_dirty(handle, di_bh); 1599 1600 out: 1601 return ret; 1602 } 1603 1604 void ocfs2_rollback_alloc_dinode_counts(struct inode *inode, 1605 struct buffer_head *di_bh, 1606 u32 num_bits, 1607 u16 chain) 1608 { 1609 u32 tmp_used; 1610 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data; 1611 struct ocfs2_chain_list *cl; 1612 1613 cl = (struct ocfs2_chain_list *)&di->id2.i_chain; 1614 tmp_used = le32_to_cpu(di->id1.bitmap1.i_used); 1615 di->id1.bitmap1.i_used = cpu_to_le32(tmp_used - num_bits); 1616 le32_add_cpu(&cl->cl_recs[chain].c_free, num_bits); 1617 } 1618 1619 static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res, 1620 struct ocfs2_extent_rec *rec, 1621 struct ocfs2_chain_list *cl) 1622 { 1623 unsigned int bpc = le16_to_cpu(cl->cl_bpc); 1624 unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc; 1625 unsigned int bitcount = le16_to_cpu(rec->e_leaf_clusters) * bpc; 1626 1627 if (res->sr_bit_offset < bitoff) 1628 return 0; 1629 if (res->sr_bit_offset >= (bitoff + bitcount)) 1630 return 0; 1631 res->sr_blkno = le64_to_cpu(rec->e_blkno) + 1632 (res->sr_bit_offset - bitoff); 1633 if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount)) 1634 res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset; 1635 return 1; 1636 } 1637 1638 static void ocfs2_bg_discontig_fix_result(struct ocfs2_alloc_context *ac, 1639 struct ocfs2_group_desc *bg, 1640 struct ocfs2_suballoc_result *res) 1641 { 1642 int i; 1643 u64 bg_blkno = res->sr_bg_blkno; /* Save off */ 1644 struct ocfs2_extent_rec *rec; 1645 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data; 1646 struct ocfs2_chain_list *cl = &di->id2.i_chain; 1647 1648 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) { 1649 res->sr_blkno = 0; 1650 return; 1651 } 1652 1653 res->sr_blkno = res->sr_bg_blkno + res->sr_bit_offset; 1654 res->sr_bg_blkno = 0; /* Clear it for contig block groups */ 1655 if (!ocfs2_supports_discontig_bg(OCFS2_SB(ac->ac_inode->i_sb)) || 1656 !bg->bg_list.l_next_free_rec) 1657 return; 1658 1659 for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) { 1660 rec = &bg->bg_list.l_recs[i]; 1661 if (ocfs2_bg_discontig_fix_by_rec(res, rec, cl)) { 1662 res->sr_bg_blkno = bg_blkno; /* Restore */ 1663 break; 1664 } 1665 } 1666 } 1667 1668 static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac, 1669 handle_t *handle, 1670 u32 bits_wanted, 1671 u32 min_bits, 1672 struct ocfs2_suballoc_result *res, 1673 u16 *bits_left) 1674 { 1675 int ret; 1676 struct buffer_head *group_bh = NULL; 1677 struct ocfs2_group_desc *gd; 1678 struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data; 1679 struct inode *alloc_inode = ac->ac_inode; 1680 1681 ret = ocfs2_read_group_descriptor(alloc_inode, di, 1682 res->sr_bg_blkno, &group_bh); 1683 if (ret < 0) { 1684 mlog_errno(ret); 1685 return ret; 1686 } 1687 1688 gd = (struct ocfs2_group_desc *) group_bh->b_data; 1689 ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits, 1690 ac->ac_max_block, res); 1691 if (ret < 0) { 1692 if (ret != -ENOSPC) 1693 mlog_errno(ret); 1694 goto out; 1695 } 1696 1697 if (!ret) 1698 ocfs2_bg_discontig_fix_result(ac, gd, res); 1699 1700 /* 1701 * sr_bg_blkno might have been changed by 1702 * ocfs2_bg_discontig_fix_result 1703 */ 1704 res->sr_bg_stable_blkno = group_bh->b_blocknr; 1705 1706 if (ac->ac_find_loc_only) 1707 goto out_loc_only; 1708 1709 ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh, 1710 res->sr_bits, 1711 le16_to_cpu(gd->bg_chain)); 1712 if (ret < 0) { 1713 mlog_errno(ret); 1714 goto out; 1715 } 1716 1717 ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh, 1718 res->sr_bit_offset, res->sr_bits); 1719 if (ret < 0) { 1720 ocfs2_rollback_alloc_dinode_counts(alloc_inode, ac->ac_bh, 1721 res->sr_bits, 1722 le16_to_cpu(gd->bg_chain)); 1723 mlog_errno(ret); 1724 } 1725 1726 out_loc_only: 1727 *bits_left = le16_to_cpu(gd->bg_free_bits_count); 1728 1729 out: 1730 brelse(group_bh); 1731 1732 return ret; 1733 } 1734 1735 static int ocfs2_search_chain(struct ocfs2_alloc_context *ac, 1736 handle_t *handle, 1737 u32 bits_wanted, 1738 u32 min_bits, 1739 struct ocfs2_suballoc_result *res, 1740 u16 *bits_left) 1741 { 1742 int status; 1743 u16 chain; 1744 u64 next_group; 1745 struct inode *alloc_inode = ac->ac_inode; 1746 struct buffer_head *group_bh = NULL; 1747 struct buffer_head *prev_group_bh = NULL; 1748 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) ac->ac_bh->b_data; 1749 struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &fe->id2.i_chain; 1750 struct ocfs2_group_desc *bg; 1751 1752 chain = ac->ac_chain; 1753 trace_ocfs2_search_chain_begin( 1754 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno, 1755 bits_wanted, chain); 1756 1757 status = ocfs2_read_group_descriptor(alloc_inode, fe, 1758 le64_to_cpu(cl->cl_recs[chain].c_blkno), 1759 &group_bh); 1760 if (status < 0) { 1761 mlog_errno(status); 1762 goto bail; 1763 } 1764 bg = (struct ocfs2_group_desc *) group_bh->b_data; 1765 1766 status = -ENOSPC; 1767 /* for now, the chain search is a bit simplistic. We just use 1768 * the 1st group with any empty bits. */ 1769 while ((status = ac->ac_group_search(alloc_inode, group_bh, 1770 bits_wanted, min_bits, 1771 ac->ac_max_block, 1772 res)) == -ENOSPC) { 1773 if (!bg->bg_next_group) 1774 break; 1775 1776 brelse(prev_group_bh); 1777 prev_group_bh = NULL; 1778 1779 next_group = le64_to_cpu(bg->bg_next_group); 1780 prev_group_bh = group_bh; 1781 group_bh = NULL; 1782 status = ocfs2_read_group_descriptor(alloc_inode, fe, 1783 next_group, &group_bh); 1784 if (status < 0) { 1785 mlog_errno(status); 1786 goto bail; 1787 } 1788 bg = (struct ocfs2_group_desc *) group_bh->b_data; 1789 } 1790 if (status < 0) { 1791 if (status != -ENOSPC) 1792 mlog_errno(status); 1793 goto bail; 1794 } 1795 1796 trace_ocfs2_search_chain_succ( 1797 (unsigned long long)le64_to_cpu(bg->bg_blkno), res->sr_bits); 1798 1799 res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno); 1800 1801 BUG_ON(res->sr_bits == 0); 1802 if (!status) 1803 ocfs2_bg_discontig_fix_result(ac, bg, res); 1804 1805 /* 1806 * sr_bg_blkno might have been changed by 1807 * ocfs2_bg_discontig_fix_result 1808 */ 1809 res->sr_bg_stable_blkno = group_bh->b_blocknr; 1810 1811 /* 1812 * Keep track of previous block descriptor read. When 1813 * we find a target, if we have read more than X 1814 * number of descriptors, and the target is reasonably 1815 * empty, relink him to top of his chain. 1816 * 1817 * We've read 0 extra blocks and only send one more to 1818 * the transaction, yet the next guy to search has a 1819 * much easier time. 1820 * 1821 * Do this *after* figuring out how many bits we're taking out 1822 * of our target group. 1823 */ 1824 if (!ac->ac_disable_chain_relink && 1825 (prev_group_bh) && 1826 (ocfs2_block_group_reasonably_empty(bg, res->sr_bits))) { 1827 status = ocfs2_relink_block_group(handle, alloc_inode, 1828 ac->ac_bh, group_bh, 1829 prev_group_bh, chain); 1830 if (status < 0) { 1831 mlog_errno(status); 1832 goto bail; 1833 } 1834 } 1835 1836 if (ac->ac_find_loc_only) 1837 goto out_loc_only; 1838 1839 status = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, 1840 ac->ac_bh, res->sr_bits, 1841 chain); 1842 if (status) { 1843 mlog_errno(status); 1844 goto bail; 1845 } 1846 1847 status = ocfs2_block_group_set_bits(handle, 1848 alloc_inode, 1849 bg, 1850 group_bh, 1851 res->sr_bit_offset, 1852 res->sr_bits); 1853 if (status < 0) { 1854 ocfs2_rollback_alloc_dinode_counts(alloc_inode, 1855 ac->ac_bh, res->sr_bits, chain); 1856 mlog_errno(status); 1857 goto bail; 1858 } 1859 1860 trace_ocfs2_search_chain_end( 1861 (unsigned long long)le64_to_cpu(fe->i_blkno), 1862 res->sr_bits); 1863 1864 out_loc_only: 1865 *bits_left = le16_to_cpu(bg->bg_free_bits_count); 1866 bail: 1867 brelse(group_bh); 1868 brelse(prev_group_bh); 1869 1870 if (status) 1871 mlog_errno(status); 1872 return status; 1873 } 1874 1875 /* will give out up to bits_wanted contiguous bits. */ 1876 static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac, 1877 handle_t *handle, 1878 u32 bits_wanted, 1879 u32 min_bits, 1880 struct ocfs2_suballoc_result *res) 1881 { 1882 int status; 1883 u16 victim, i; 1884 u16 bits_left = 0; 1885 u64 hint = ac->ac_last_group; 1886 struct ocfs2_chain_list *cl; 1887 struct ocfs2_dinode *fe; 1888 1889 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted); 1890 BUG_ON(bits_wanted > (ac->ac_bits_wanted - ac->ac_bits_given)); 1891 BUG_ON(!ac->ac_bh); 1892 1893 fe = (struct ocfs2_dinode *) ac->ac_bh->b_data; 1894 1895 /* The bh was validated by the inode read during 1896 * ocfs2_reserve_suballoc_bits(). Any corruption is a code bug. */ 1897 BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); 1898 1899 if (le32_to_cpu(fe->id1.bitmap1.i_used) >= 1900 le32_to_cpu(fe->id1.bitmap1.i_total)) { 1901 status = ocfs2_error(ac->ac_inode->i_sb, 1902 "Chain allocator dinode %llu has %u used bits but only %u total\n", 1903 (unsigned long long)le64_to_cpu(fe->i_blkno), 1904 le32_to_cpu(fe->id1.bitmap1.i_used), 1905 le32_to_cpu(fe->id1.bitmap1.i_total)); 1906 goto bail; 1907 } 1908 1909 res->sr_bg_blkno = hint; 1910 if (res->sr_bg_blkno) { 1911 /* Attempt to short-circuit the usual search mechanism 1912 * by jumping straight to the most recently used 1913 * allocation group. This helps us maintain some 1914 * contiguousness across allocations. */ 1915 status = ocfs2_search_one_group(ac, handle, bits_wanted, 1916 min_bits, res, &bits_left); 1917 if (!status) 1918 goto set_hint; 1919 if (status < 0 && status != -ENOSPC) { 1920 mlog_errno(status); 1921 goto bail; 1922 } 1923 } 1924 1925 cl = (struct ocfs2_chain_list *) &fe->id2.i_chain; 1926 1927 victim = ocfs2_find_victim_chain(cl); 1928 ac->ac_chain = victim; 1929 1930 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits, 1931 res, &bits_left); 1932 if (!status) { 1933 if (ocfs2_is_cluster_bitmap(ac->ac_inode)) 1934 hint = res->sr_bg_blkno; 1935 else 1936 hint = ocfs2_group_from_res(res); 1937 goto set_hint; 1938 } 1939 if (status < 0 && status != -ENOSPC) { 1940 mlog_errno(status); 1941 goto bail; 1942 } 1943 1944 trace_ocfs2_claim_suballoc_bits(victim); 1945 1946 /* If we didn't pick a good victim, then just default to 1947 * searching each chain in order. Don't allow chain relinking 1948 * because we only calculate enough journal credits for one 1949 * relink per alloc. */ 1950 ac->ac_disable_chain_relink = 1; 1951 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i ++) { 1952 if (i == victim) 1953 continue; 1954 if (!cl->cl_recs[i].c_free) 1955 continue; 1956 1957 ac->ac_chain = i; 1958 status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits, 1959 res, &bits_left); 1960 if (!status) { 1961 hint = ocfs2_group_from_res(res); 1962 break; 1963 } 1964 if (status < 0 && status != -ENOSPC) { 1965 mlog_errno(status); 1966 goto bail; 1967 } 1968 } 1969 1970 set_hint: 1971 if (status != -ENOSPC) { 1972 /* If the next search of this group is not likely to 1973 * yield a suitable extent, then we reset the last 1974 * group hint so as to not waste a disk read */ 1975 if (bits_left < min_bits) 1976 ac->ac_last_group = 0; 1977 else 1978 ac->ac_last_group = hint; 1979 } 1980 1981 bail: 1982 if (status) 1983 mlog_errno(status); 1984 return status; 1985 } 1986 1987 int ocfs2_claim_metadata(handle_t *handle, 1988 struct ocfs2_alloc_context *ac, 1989 u32 bits_wanted, 1990 u64 *suballoc_loc, 1991 u16 *suballoc_bit_start, 1992 unsigned int *num_bits, 1993 u64 *blkno_start) 1994 { 1995 int status; 1996 struct ocfs2_suballoc_result res = { .sr_blkno = 0, }; 1997 1998 BUG_ON(!ac); 1999 BUG_ON(ac->ac_bits_wanted < (ac->ac_bits_given + bits_wanted)); 2000 BUG_ON(ac->ac_which != OCFS2_AC_USE_META); 2001 2002 status = ocfs2_claim_suballoc_bits(ac, 2003 handle, 2004 bits_wanted, 2005 1, 2006 &res); 2007 if (status < 0) { 2008 mlog_errno(status); 2009 goto bail; 2010 } 2011 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs); 2012 2013 *suballoc_loc = res.sr_bg_blkno; 2014 *suballoc_bit_start = res.sr_bit_offset; 2015 *blkno_start = res.sr_blkno; 2016 ac->ac_bits_given += res.sr_bits; 2017 *num_bits = res.sr_bits; 2018 status = 0; 2019 bail: 2020 if (status) 2021 mlog_errno(status); 2022 return status; 2023 } 2024 2025 static void ocfs2_init_inode_ac_group(struct inode *dir, 2026 struct buffer_head *parent_di_bh, 2027 struct ocfs2_alloc_context *ac) 2028 { 2029 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_di_bh->b_data; 2030 /* 2031 * Try to allocate inodes from some specific group. 2032 * 2033 * If the parent dir has recorded the last group used in allocation, 2034 * cool, use it. Otherwise if we try to allocate new inode from the 2035 * same slot the parent dir belongs to, use the same chunk. 2036 * 2037 * We are very careful here to avoid the mistake of setting 2038 * ac_last_group to a group descriptor from a different (unlocked) slot. 2039 */ 2040 if (OCFS2_I(dir)->ip_last_used_group && 2041 OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot) 2042 ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group; 2043 else if (le16_to_cpu(di->i_suballoc_slot) == ac->ac_alloc_slot) { 2044 if (di->i_suballoc_loc) 2045 ac->ac_last_group = le64_to_cpu(di->i_suballoc_loc); 2046 else 2047 ac->ac_last_group = ocfs2_which_suballoc_group( 2048 le64_to_cpu(di->i_blkno), 2049 le16_to_cpu(di->i_suballoc_bit)); 2050 } 2051 } 2052 2053 static inline void ocfs2_save_inode_ac_group(struct inode *dir, 2054 struct ocfs2_alloc_context *ac) 2055 { 2056 OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group; 2057 OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot; 2058 } 2059 2060 int ocfs2_find_new_inode_loc(struct inode *dir, 2061 struct buffer_head *parent_fe_bh, 2062 struct ocfs2_alloc_context *ac, 2063 u64 *fe_blkno) 2064 { 2065 int ret; 2066 handle_t *handle = NULL; 2067 struct ocfs2_suballoc_result *res; 2068 2069 BUG_ON(!ac); 2070 BUG_ON(ac->ac_bits_given != 0); 2071 BUG_ON(ac->ac_bits_wanted != 1); 2072 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE); 2073 2074 res = kzalloc(sizeof(*res), GFP_NOFS); 2075 if (res == NULL) { 2076 ret = -ENOMEM; 2077 mlog_errno(ret); 2078 goto out; 2079 } 2080 2081 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac); 2082 2083 /* 2084 * The handle started here is for chain relink. Alternatively, 2085 * we could just disable relink for these calls. 2086 */ 2087 handle = ocfs2_start_trans(OCFS2_SB(dir->i_sb), OCFS2_SUBALLOC_ALLOC); 2088 if (IS_ERR(handle)) { 2089 ret = PTR_ERR(handle); 2090 handle = NULL; 2091 mlog_errno(ret); 2092 goto out; 2093 } 2094 2095 /* 2096 * This will instruct ocfs2_claim_suballoc_bits and 2097 * ocfs2_search_one_group to search but save actual allocation 2098 * for later. 2099 */ 2100 ac->ac_find_loc_only = 1; 2101 2102 ret = ocfs2_claim_suballoc_bits(ac, handle, 1, 1, res); 2103 if (ret < 0) { 2104 mlog_errno(ret); 2105 goto out; 2106 } 2107 2108 ac->ac_find_loc_priv = res; 2109 *fe_blkno = res->sr_blkno; 2110 ocfs2_update_inode_fsync_trans(handle, dir, 0); 2111 out: 2112 if (handle) 2113 ocfs2_commit_trans(OCFS2_SB(dir->i_sb), handle); 2114 2115 if (ret) 2116 kfree(res); 2117 2118 return ret; 2119 } 2120 2121 int ocfs2_claim_new_inode_at_loc(handle_t *handle, 2122 struct inode *dir, 2123 struct ocfs2_alloc_context *ac, 2124 u64 *suballoc_loc, 2125 u16 *suballoc_bit, 2126 u64 di_blkno) 2127 { 2128 int ret; 2129 u16 chain; 2130 struct ocfs2_suballoc_result *res = ac->ac_find_loc_priv; 2131 struct buffer_head *bg_bh = NULL; 2132 struct ocfs2_group_desc *bg; 2133 struct ocfs2_dinode *di = (struct ocfs2_dinode *) ac->ac_bh->b_data; 2134 2135 /* 2136 * Since di_blkno is being passed back in, we check for any 2137 * inconsistencies which may have happened between 2138 * calls. These are code bugs as di_blkno is not expected to 2139 * change once returned from ocfs2_find_new_inode_loc() 2140 */ 2141 BUG_ON(res->sr_blkno != di_blkno); 2142 2143 ret = ocfs2_read_group_descriptor(ac->ac_inode, di, 2144 res->sr_bg_stable_blkno, &bg_bh); 2145 if (ret) { 2146 mlog_errno(ret); 2147 goto out; 2148 } 2149 2150 bg = (struct ocfs2_group_desc *) bg_bh->b_data; 2151 chain = le16_to_cpu(bg->bg_chain); 2152 2153 ret = ocfs2_alloc_dinode_update_counts(ac->ac_inode, handle, 2154 ac->ac_bh, res->sr_bits, 2155 chain); 2156 if (ret) { 2157 mlog_errno(ret); 2158 goto out; 2159 } 2160 2161 ret = ocfs2_block_group_set_bits(handle, 2162 ac->ac_inode, 2163 bg, 2164 bg_bh, 2165 res->sr_bit_offset, 2166 res->sr_bits); 2167 if (ret < 0) { 2168 ocfs2_rollback_alloc_dinode_counts(ac->ac_inode, 2169 ac->ac_bh, res->sr_bits, chain); 2170 mlog_errno(ret); 2171 goto out; 2172 } 2173 2174 trace_ocfs2_claim_new_inode_at_loc((unsigned long long)di_blkno, 2175 res->sr_bits); 2176 2177 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs); 2178 2179 BUG_ON(res->sr_bits != 1); 2180 2181 *suballoc_loc = res->sr_bg_blkno; 2182 *suballoc_bit = res->sr_bit_offset; 2183 ac->ac_bits_given++; 2184 ocfs2_save_inode_ac_group(dir, ac); 2185 2186 out: 2187 brelse(bg_bh); 2188 2189 return ret; 2190 } 2191 2192 int ocfs2_claim_new_inode(handle_t *handle, 2193 struct inode *dir, 2194 struct buffer_head *parent_fe_bh, 2195 struct ocfs2_alloc_context *ac, 2196 u64 *suballoc_loc, 2197 u16 *suballoc_bit, 2198 u64 *fe_blkno) 2199 { 2200 int status; 2201 struct ocfs2_suballoc_result res; 2202 2203 BUG_ON(!ac); 2204 BUG_ON(ac->ac_bits_given != 0); 2205 BUG_ON(ac->ac_bits_wanted != 1); 2206 BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE); 2207 2208 ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac); 2209 2210 status = ocfs2_claim_suballoc_bits(ac, 2211 handle, 2212 1, 2213 1, 2214 &res); 2215 if (status < 0) { 2216 mlog_errno(status); 2217 goto bail; 2218 } 2219 atomic_inc(&OCFS2_SB(ac->ac_inode->i_sb)->alloc_stats.bg_allocs); 2220 2221 BUG_ON(res.sr_bits != 1); 2222 2223 *suballoc_loc = res.sr_bg_blkno; 2224 *suballoc_bit = res.sr_bit_offset; 2225 *fe_blkno = res.sr_blkno; 2226 ac->ac_bits_given++; 2227 ocfs2_save_inode_ac_group(dir, ac); 2228 status = 0; 2229 bail: 2230 if (status) 2231 mlog_errno(status); 2232 return status; 2233 } 2234 2235 /* translate a group desc. blkno and it's bitmap offset into 2236 * disk cluster offset. */ 2237 static inline u32 ocfs2_desc_bitmap_to_cluster_off(struct inode *inode, 2238 u64 bg_blkno, 2239 u16 bg_bit_off) 2240 { 2241 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2242 u32 cluster = 0; 2243 2244 BUG_ON(!ocfs2_is_cluster_bitmap(inode)); 2245 2246 if (bg_blkno != osb->first_cluster_group_blkno) 2247 cluster = ocfs2_blocks_to_clusters(inode->i_sb, bg_blkno); 2248 cluster += (u32) bg_bit_off; 2249 return cluster; 2250 } 2251 2252 /* given a cluster offset, calculate which block group it belongs to 2253 * and return that block offset. */ 2254 u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster) 2255 { 2256 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2257 u32 group_no; 2258 2259 BUG_ON(!ocfs2_is_cluster_bitmap(inode)); 2260 2261 group_no = cluster / osb->bitmap_cpg; 2262 if (!group_no) 2263 return osb->first_cluster_group_blkno; 2264 return ocfs2_clusters_to_blocks(inode->i_sb, 2265 group_no * osb->bitmap_cpg); 2266 } 2267 2268 /* given the block number of a cluster start, calculate which cluster 2269 * group and descriptor bitmap offset that corresponds to. */ 2270 static inline void ocfs2_block_to_cluster_group(struct inode *inode, 2271 u64 data_blkno, 2272 u64 *bg_blkno, 2273 u16 *bg_bit_off) 2274 { 2275 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2276 u32 data_cluster = ocfs2_blocks_to_clusters(osb->sb, data_blkno); 2277 2278 BUG_ON(!ocfs2_is_cluster_bitmap(inode)); 2279 2280 *bg_blkno = ocfs2_which_cluster_group(inode, 2281 data_cluster); 2282 2283 if (*bg_blkno == osb->first_cluster_group_blkno) 2284 *bg_bit_off = (u16) data_cluster; 2285 else 2286 *bg_bit_off = (u16) ocfs2_blocks_to_clusters(osb->sb, 2287 data_blkno - *bg_blkno); 2288 } 2289 2290 /* 2291 * min_bits - minimum contiguous chunk from this total allocation we 2292 * can handle. set to what we asked for originally for a full 2293 * contig. allocation, set to '1' to indicate we can deal with extents 2294 * of any size. 2295 */ 2296 int __ocfs2_claim_clusters(handle_t *handle, 2297 struct ocfs2_alloc_context *ac, 2298 u32 min_clusters, 2299 u32 max_clusters, 2300 u32 *cluster_start, 2301 u32 *num_clusters) 2302 { 2303 int status; 2304 unsigned int bits_wanted = max_clusters; 2305 struct ocfs2_suballoc_result res = { .sr_blkno = 0, }; 2306 struct ocfs2_super *osb = OCFS2_SB(ac->ac_inode->i_sb); 2307 2308 BUG_ON(ac->ac_bits_given >= ac->ac_bits_wanted); 2309 2310 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL 2311 && ac->ac_which != OCFS2_AC_USE_MAIN); 2312 2313 if (ac->ac_which == OCFS2_AC_USE_LOCAL) { 2314 WARN_ON(min_clusters > 1); 2315 2316 status = ocfs2_claim_local_alloc_bits(osb, 2317 handle, 2318 ac, 2319 bits_wanted, 2320 cluster_start, 2321 num_clusters); 2322 if (!status) 2323 atomic_inc(&osb->alloc_stats.local_data); 2324 } else { 2325 if (min_clusters > (osb->bitmap_cpg - 1)) { 2326 /* The only paths asking for contiguousness 2327 * should know about this already. */ 2328 mlog(ML_ERROR, "minimum allocation requested %u exceeds " 2329 "group bitmap size %u!\n", min_clusters, 2330 osb->bitmap_cpg); 2331 status = -ENOSPC; 2332 goto bail; 2333 } 2334 /* clamp the current request down to a realistic size. */ 2335 if (bits_wanted > (osb->bitmap_cpg - 1)) 2336 bits_wanted = osb->bitmap_cpg - 1; 2337 2338 status = ocfs2_claim_suballoc_bits(ac, 2339 handle, 2340 bits_wanted, 2341 min_clusters, 2342 &res); 2343 if (!status) { 2344 BUG_ON(res.sr_blkno); /* cluster alloc can't set */ 2345 *cluster_start = 2346 ocfs2_desc_bitmap_to_cluster_off(ac->ac_inode, 2347 res.sr_bg_blkno, 2348 res.sr_bit_offset); 2349 atomic_inc(&osb->alloc_stats.bitmap_data); 2350 *num_clusters = res.sr_bits; 2351 } 2352 } 2353 if (status < 0) { 2354 if (status != -ENOSPC) 2355 mlog_errno(status); 2356 goto bail; 2357 } 2358 2359 ac->ac_bits_given += *num_clusters; 2360 2361 bail: 2362 if (status) 2363 mlog_errno(status); 2364 return status; 2365 } 2366 2367 int ocfs2_claim_clusters(handle_t *handle, 2368 struct ocfs2_alloc_context *ac, 2369 u32 min_clusters, 2370 u32 *cluster_start, 2371 u32 *num_clusters) 2372 { 2373 unsigned int bits_wanted = ac->ac_bits_wanted - ac->ac_bits_given; 2374 2375 return __ocfs2_claim_clusters(handle, ac, min_clusters, 2376 bits_wanted, cluster_start, num_clusters); 2377 } 2378 2379 static int ocfs2_block_group_clear_bits(handle_t *handle, 2380 struct inode *alloc_inode, 2381 struct ocfs2_group_desc *bg, 2382 struct buffer_head *group_bh, 2383 unsigned int bit_off, 2384 unsigned int num_bits, 2385 void (*undo_fn)(unsigned int bit, 2386 unsigned long *bmap)) 2387 { 2388 int status; 2389 unsigned int tmp; 2390 struct ocfs2_group_desc *undo_bg = NULL; 2391 struct journal_head *jh; 2392 2393 /* The caller got this descriptor from 2394 * ocfs2_read_group_descriptor(). Any corruption is a code bug. */ 2395 BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg)); 2396 2397 trace_ocfs2_block_group_clear_bits(bit_off, num_bits); 2398 2399 BUG_ON(undo_fn && !ocfs2_is_cluster_bitmap(alloc_inode)); 2400 status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode), 2401 group_bh, 2402 undo_fn ? 2403 OCFS2_JOURNAL_ACCESS_UNDO : 2404 OCFS2_JOURNAL_ACCESS_WRITE); 2405 if (status < 0) { 2406 mlog_errno(status); 2407 goto bail; 2408 } 2409 2410 jh = bh2jh(group_bh); 2411 if (undo_fn) { 2412 spin_lock(&jh->b_state_lock); 2413 undo_bg = (struct ocfs2_group_desc *) jh->b_committed_data; 2414 BUG_ON(!undo_bg); 2415 } 2416 2417 tmp = num_bits; 2418 while(tmp--) { 2419 ocfs2_clear_bit((bit_off + tmp), 2420 (unsigned long *) bg->bg_bitmap); 2421 if (undo_fn) 2422 undo_fn(bit_off + tmp, 2423 (unsigned long *) undo_bg->bg_bitmap); 2424 } 2425 le16_add_cpu(&bg->bg_free_bits_count, num_bits); 2426 if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) { 2427 if (undo_fn) 2428 spin_unlock(&jh->b_state_lock); 2429 return ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit count %u but claims %u are freed. num_bits %d\n", 2430 (unsigned long long)le64_to_cpu(bg->bg_blkno), 2431 le16_to_cpu(bg->bg_bits), 2432 le16_to_cpu(bg->bg_free_bits_count), 2433 num_bits); 2434 } 2435 2436 if (undo_fn) 2437 spin_unlock(&jh->b_state_lock); 2438 2439 ocfs2_journal_dirty(handle, group_bh); 2440 bail: 2441 return status; 2442 } 2443 2444 /* 2445 * expects the suballoc inode to already be locked. 2446 */ 2447 static int _ocfs2_free_suballoc_bits(handle_t *handle, 2448 struct inode *alloc_inode, 2449 struct buffer_head *alloc_bh, 2450 unsigned int start_bit, 2451 u64 bg_blkno, 2452 unsigned int count, 2453 void (*undo_fn)(unsigned int bit, 2454 unsigned long *bitmap)) 2455 { 2456 int status = 0; 2457 u32 tmp_used; 2458 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data; 2459 struct ocfs2_chain_list *cl = &fe->id2.i_chain; 2460 struct buffer_head *group_bh = NULL; 2461 struct ocfs2_group_desc *group; 2462 2463 /* The alloc_bh comes from ocfs2_free_dinode() or 2464 * ocfs2_free_clusters(). The callers have all locked the 2465 * allocator and gotten alloc_bh from the lock call. This 2466 * validates the dinode buffer. Any corruption that has happened 2467 * is a code bug. */ 2468 BUG_ON(!OCFS2_IS_VALID_DINODE(fe)); 2469 BUG_ON((count + start_bit) > ocfs2_bits_per_group(cl)); 2470 2471 trace_ocfs2_free_suballoc_bits( 2472 (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno, 2473 (unsigned long long)bg_blkno, 2474 start_bit, count); 2475 2476 status = ocfs2_read_group_descriptor(alloc_inode, fe, bg_blkno, 2477 &group_bh); 2478 if (status < 0) { 2479 mlog_errno(status); 2480 goto bail; 2481 } 2482 group = (struct ocfs2_group_desc *) group_bh->b_data; 2483 2484 BUG_ON((count + start_bit) > le16_to_cpu(group->bg_bits)); 2485 2486 status = ocfs2_block_group_clear_bits(handle, alloc_inode, 2487 group, group_bh, 2488 start_bit, count, undo_fn); 2489 if (status < 0) { 2490 mlog_errno(status); 2491 goto bail; 2492 } 2493 2494 status = ocfs2_journal_access_di(handle, INODE_CACHE(alloc_inode), 2495 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE); 2496 if (status < 0) { 2497 mlog_errno(status); 2498 ocfs2_block_group_set_bits(handle, alloc_inode, group, group_bh, 2499 start_bit, count); 2500 goto bail; 2501 } 2502 2503 le32_add_cpu(&cl->cl_recs[le16_to_cpu(group->bg_chain)].c_free, 2504 count); 2505 tmp_used = le32_to_cpu(fe->id1.bitmap1.i_used); 2506 fe->id1.bitmap1.i_used = cpu_to_le32(tmp_used - count); 2507 ocfs2_journal_dirty(handle, alloc_bh); 2508 2509 bail: 2510 brelse(group_bh); 2511 return status; 2512 } 2513 2514 int ocfs2_free_suballoc_bits(handle_t *handle, 2515 struct inode *alloc_inode, 2516 struct buffer_head *alloc_bh, 2517 unsigned int start_bit, 2518 u64 bg_blkno, 2519 unsigned int count) 2520 { 2521 return _ocfs2_free_suballoc_bits(handle, alloc_inode, alloc_bh, 2522 start_bit, bg_blkno, count, NULL); 2523 } 2524 2525 int ocfs2_free_dinode(handle_t *handle, 2526 struct inode *inode_alloc_inode, 2527 struct buffer_head *inode_alloc_bh, 2528 struct ocfs2_dinode *di) 2529 { 2530 u64 blk = le64_to_cpu(di->i_blkno); 2531 u16 bit = le16_to_cpu(di->i_suballoc_bit); 2532 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit); 2533 2534 if (di->i_suballoc_loc) 2535 bg_blkno = le64_to_cpu(di->i_suballoc_loc); 2536 return ocfs2_free_suballoc_bits(handle, inode_alloc_inode, 2537 inode_alloc_bh, bit, bg_blkno, 1); 2538 } 2539 2540 static int _ocfs2_free_clusters(handle_t *handle, 2541 struct inode *bitmap_inode, 2542 struct buffer_head *bitmap_bh, 2543 u64 start_blk, 2544 unsigned int num_clusters, 2545 void (*undo_fn)(unsigned int bit, 2546 unsigned long *bitmap)) 2547 { 2548 int status; 2549 u16 bg_start_bit; 2550 u64 bg_blkno; 2551 2552 /* You can't ever have a contiguous set of clusters 2553 * bigger than a block group bitmap so we never have to worry 2554 * about looping on them. 2555 * This is expensive. We can safely remove once this stuff has 2556 * gotten tested really well. */ 2557 BUG_ON(start_blk != ocfs2_clusters_to_blocks(bitmap_inode->i_sb, 2558 ocfs2_blocks_to_clusters(bitmap_inode->i_sb, 2559 start_blk))); 2560 2561 2562 ocfs2_block_to_cluster_group(bitmap_inode, start_blk, &bg_blkno, 2563 &bg_start_bit); 2564 2565 trace_ocfs2_free_clusters((unsigned long long)bg_blkno, 2566 (unsigned long long)start_blk, 2567 bg_start_bit, num_clusters); 2568 2569 status = _ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh, 2570 bg_start_bit, bg_blkno, 2571 num_clusters, undo_fn); 2572 if (status < 0) { 2573 mlog_errno(status); 2574 goto out; 2575 } 2576 2577 ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb), 2578 num_clusters); 2579 2580 out: 2581 return status; 2582 } 2583 2584 int ocfs2_free_clusters(handle_t *handle, 2585 struct inode *bitmap_inode, 2586 struct buffer_head *bitmap_bh, 2587 u64 start_blk, 2588 unsigned int num_clusters) 2589 { 2590 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh, 2591 start_blk, num_clusters, 2592 _ocfs2_set_bit); 2593 } 2594 2595 /* 2596 * Give never-used clusters back to the global bitmap. We don't need 2597 * to protect these bits in the undo buffer. 2598 */ 2599 int ocfs2_release_clusters(handle_t *handle, 2600 struct inode *bitmap_inode, 2601 struct buffer_head *bitmap_bh, 2602 u64 start_blk, 2603 unsigned int num_clusters) 2604 { 2605 return _ocfs2_free_clusters(handle, bitmap_inode, bitmap_bh, 2606 start_blk, num_clusters, 2607 _ocfs2_clear_bit); 2608 } 2609 2610 /* 2611 * For a given allocation, determine which allocators will need to be 2612 * accessed, and lock them, reserving the appropriate number of bits. 2613 * 2614 * Sparse file systems call this from ocfs2_write_begin_nolock() 2615 * and ocfs2_allocate_unwritten_extents(). 2616 * 2617 * File systems which don't support holes call this from 2618 * ocfs2_extend_allocation(). 2619 */ 2620 int ocfs2_lock_allocators(struct inode *inode, 2621 struct ocfs2_extent_tree *et, 2622 u32 clusters_to_add, u32 extents_to_split, 2623 struct ocfs2_alloc_context **data_ac, 2624 struct ocfs2_alloc_context **meta_ac) 2625 { 2626 int ret = 0, num_free_extents; 2627 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split; 2628 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2629 2630 *meta_ac = NULL; 2631 if (data_ac) 2632 *data_ac = NULL; 2633 2634 BUG_ON(clusters_to_add != 0 && data_ac == NULL); 2635 2636 num_free_extents = ocfs2_num_free_extents(et); 2637 if (num_free_extents < 0) { 2638 ret = num_free_extents; 2639 mlog_errno(ret); 2640 goto out; 2641 } 2642 2643 /* 2644 * Sparse allocation file systems need to be more conservative 2645 * with reserving room for expansion - the actual allocation 2646 * happens while we've got a journal handle open so re-taking 2647 * a cluster lock (because we ran out of room for another 2648 * extent) will violate ordering rules. 2649 * 2650 * Most of the time we'll only be seeing this 1 cluster at a time 2651 * anyway. 2652 * 2653 * Always lock for any unwritten extents - we might want to 2654 * add blocks during a split. 2655 */ 2656 if (!num_free_extents || 2657 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) { 2658 ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac); 2659 if (ret < 0) { 2660 if (ret != -ENOSPC) 2661 mlog_errno(ret); 2662 goto out; 2663 } 2664 } 2665 2666 if (clusters_to_add == 0) 2667 goto out; 2668 2669 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac); 2670 if (ret < 0) { 2671 if (ret != -ENOSPC) 2672 mlog_errno(ret); 2673 goto out; 2674 } 2675 2676 out: 2677 if (ret) { 2678 if (*meta_ac) { 2679 ocfs2_free_alloc_context(*meta_ac); 2680 *meta_ac = NULL; 2681 } 2682 2683 /* 2684 * We cannot have an error and a non null *data_ac. 2685 */ 2686 } 2687 2688 return ret; 2689 } 2690 2691 /* 2692 * Read the inode specified by blkno to get suballoc_slot and 2693 * suballoc_bit. 2694 */ 2695 static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno, 2696 u16 *suballoc_slot, u64 *group_blkno, 2697 u16 *suballoc_bit) 2698 { 2699 int status; 2700 struct buffer_head *inode_bh = NULL; 2701 struct ocfs2_dinode *inode_fe; 2702 2703 trace_ocfs2_get_suballoc_slot_bit((unsigned long long)blkno); 2704 2705 /* dirty read disk */ 2706 status = ocfs2_read_blocks_sync(osb, blkno, 1, &inode_bh); 2707 if (status < 0) { 2708 mlog(ML_ERROR, "read block %llu failed %d\n", 2709 (unsigned long long)blkno, status); 2710 goto bail; 2711 } 2712 2713 inode_fe = (struct ocfs2_dinode *) inode_bh->b_data; 2714 if (!OCFS2_IS_VALID_DINODE(inode_fe)) { 2715 mlog(ML_ERROR, "invalid inode %llu requested\n", 2716 (unsigned long long)blkno); 2717 status = -EINVAL; 2718 goto bail; 2719 } 2720 2721 if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT && 2722 (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) { 2723 mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n", 2724 (unsigned long long)blkno, 2725 (u32)le16_to_cpu(inode_fe->i_suballoc_slot)); 2726 status = -EINVAL; 2727 goto bail; 2728 } 2729 2730 if (suballoc_slot) 2731 *suballoc_slot = le16_to_cpu(inode_fe->i_suballoc_slot); 2732 if (suballoc_bit) 2733 *suballoc_bit = le16_to_cpu(inode_fe->i_suballoc_bit); 2734 if (group_blkno) 2735 *group_blkno = le64_to_cpu(inode_fe->i_suballoc_loc); 2736 2737 bail: 2738 brelse(inode_bh); 2739 2740 if (status) 2741 mlog_errno(status); 2742 return status; 2743 } 2744 2745 /* 2746 * test whether bit is SET in allocator bitmap or not. on success, 0 2747 * is returned and *res is 1 for SET; 0 otherwise. when fails, errno 2748 * is returned and *res is meaningless. Call this after you have 2749 * cluster locked against suballoc, or you may get a result based on 2750 * non-up2date contents 2751 */ 2752 static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb, 2753 struct inode *suballoc, 2754 struct buffer_head *alloc_bh, 2755 u64 group_blkno, u64 blkno, 2756 u16 bit, int *res) 2757 { 2758 struct ocfs2_dinode *alloc_di; 2759 struct ocfs2_group_desc *group; 2760 struct buffer_head *group_bh = NULL; 2761 u64 bg_blkno; 2762 int status; 2763 2764 trace_ocfs2_test_suballoc_bit((unsigned long long)blkno, 2765 (unsigned int)bit); 2766 2767 alloc_di = (struct ocfs2_dinode *)alloc_bh->b_data; 2768 if ((bit + 1) > ocfs2_bits_per_group(&alloc_di->id2.i_chain)) { 2769 mlog(ML_ERROR, "suballoc bit %u out of range of %u\n", 2770 (unsigned int)bit, 2771 ocfs2_bits_per_group(&alloc_di->id2.i_chain)); 2772 status = -EINVAL; 2773 goto bail; 2774 } 2775 2776 bg_blkno = group_blkno ? group_blkno : 2777 ocfs2_which_suballoc_group(blkno, bit); 2778 status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno, 2779 &group_bh); 2780 if (status < 0) { 2781 mlog(ML_ERROR, "read group %llu failed %d\n", 2782 (unsigned long long)bg_blkno, status); 2783 goto bail; 2784 } 2785 2786 group = (struct ocfs2_group_desc *) group_bh->b_data; 2787 *res = ocfs2_test_bit(bit, (unsigned long *)group->bg_bitmap); 2788 2789 bail: 2790 brelse(group_bh); 2791 2792 if (status) 2793 mlog_errno(status); 2794 return status; 2795 } 2796 2797 /* 2798 * Test if the bit representing this inode (blkno) is set in the 2799 * suballocator. 2800 * 2801 * On success, 0 is returned and *res is 1 for SET; 0 otherwise. 2802 * 2803 * In the event of failure, a negative value is returned and *res is 2804 * meaningless. 2805 * 2806 * Callers must make sure to hold nfs_sync_lock to prevent 2807 * ocfs2_delete_inode() on another node from accessing the same 2808 * suballocator concurrently. 2809 */ 2810 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res) 2811 { 2812 int status; 2813 u64 group_blkno = 0; 2814 u16 suballoc_bit = 0, suballoc_slot = 0; 2815 struct inode *inode_alloc_inode; 2816 struct buffer_head *alloc_bh = NULL; 2817 2818 trace_ocfs2_test_inode_bit((unsigned long long)blkno); 2819 2820 status = ocfs2_get_suballoc_slot_bit(osb, blkno, &suballoc_slot, 2821 &group_blkno, &suballoc_bit); 2822 if (status < 0) { 2823 mlog(ML_ERROR, "get alloc slot and bit failed %d\n", status); 2824 goto bail; 2825 } 2826 2827 if (suballoc_slot == (u16)OCFS2_INVALID_SLOT) 2828 inode_alloc_inode = ocfs2_get_system_file_inode(osb, 2829 GLOBAL_INODE_ALLOC_SYSTEM_INODE, suballoc_slot); 2830 else 2831 inode_alloc_inode = ocfs2_get_system_file_inode(osb, 2832 INODE_ALLOC_SYSTEM_INODE, suballoc_slot); 2833 if (!inode_alloc_inode) { 2834 /* the error code could be inaccurate, but we are not able to 2835 * get the correct one. */ 2836 status = -EINVAL; 2837 mlog(ML_ERROR, "unable to get alloc inode in slot %u\n", 2838 (u32)suballoc_slot); 2839 goto bail; 2840 } 2841 2842 inode_lock(inode_alloc_inode); 2843 status = ocfs2_inode_lock(inode_alloc_inode, &alloc_bh, 0); 2844 if (status < 0) { 2845 inode_unlock(inode_alloc_inode); 2846 iput(inode_alloc_inode); 2847 mlog(ML_ERROR, "lock on alloc inode on slot %u failed %d\n", 2848 (u32)suballoc_slot, status); 2849 goto bail; 2850 } 2851 2852 status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh, 2853 group_blkno, blkno, suballoc_bit, res); 2854 if (status < 0) 2855 mlog(ML_ERROR, "test suballoc bit failed %d\n", status); 2856 2857 ocfs2_inode_unlock(inode_alloc_inode, 0); 2858 inode_unlock(inode_alloc_inode); 2859 2860 iput(inode_alloc_inode); 2861 brelse(alloc_bh); 2862 bail: 2863 if (status) 2864 mlog_errno(status); 2865 return status; 2866 } 2867