1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * dir.c 5 * 6 * Creates, reads, walks and deletes directory-nodes 7 * 8 * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9 * 10 * Portions of this code from linux/fs/ext3/dir.c 11 * 12 * Copyright (C) 1992, 1993, 1994, 1995 13 * Remy Card (card@masi.ibp.fr) 14 * Laboratoire MASI - Institut Blaise pascal 15 * Universite Pierre et Marie Curie (Paris VI) 16 * 17 * from 18 * 19 * linux/fs/minix/dir.c 20 * 21 * Copyright (C) 1991, 1992 Linux Torvalds 22 * 23 * This program is free software; you can redistribute it and/or 24 * modify it under the terms of the GNU General Public 25 * License as published by the Free Software Foundation; either 26 * version 2 of the License, or (at your option) any later version. 27 * 28 * This program is distributed in the hope that it will be useful, 29 * but WITHOUT ANY WARRANTY; without even the implied warranty of 30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 31 * General Public License for more details. 32 * 33 * You should have received a copy of the GNU General Public 34 * License along with this program; if not, write to the 35 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 36 * Boston, MA 021110-1307, USA. 37 */ 38 39 #include <linux/fs.h> 40 #include <linux/types.h> 41 #include <linux/slab.h> 42 #include <linux/highmem.h> 43 #include <linux/quotaops.h> 44 #include <linux/sort.h> 45 46 #define MLOG_MASK_PREFIX ML_NAMEI 47 #include <cluster/masklog.h> 48 49 #include "ocfs2.h" 50 51 #include "alloc.h" 52 #include "blockcheck.h" 53 #include "dir.h" 54 #include "dlmglue.h" 55 #include "extent_map.h" 56 #include "file.h" 57 #include "inode.h" 58 #include "journal.h" 59 #include "namei.h" 60 #include "suballoc.h" 61 #include "super.h" 62 #include "sysfile.h" 63 #include "uptodate.h" 64 65 #include "buffer_head_io.h" 66 67 #define NAMEI_RA_CHUNKS 2 68 #define NAMEI_RA_BLOCKS 4 69 #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) 70 #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b)) 71 72 static unsigned char ocfs2_filetype_table[] = { 73 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK 74 }; 75 76 static int ocfs2_do_extend_dir(struct super_block *sb, 77 handle_t *handle, 78 struct inode *dir, 79 struct buffer_head *parent_fe_bh, 80 struct ocfs2_alloc_context *data_ac, 81 struct ocfs2_alloc_context *meta_ac, 82 struct buffer_head **new_bh); 83 static int ocfs2_dir_indexed(struct inode *inode); 84 85 /* 86 * These are distinct checks because future versions of the file system will 87 * want to have a trailing dirent structure independent of indexing. 88 */ 89 static int ocfs2_supports_dir_trailer(struct inode *dir) 90 { 91 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 92 93 if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) 94 return 0; 95 96 return ocfs2_meta_ecc(osb) || ocfs2_dir_indexed(dir); 97 } 98 99 /* 100 * "new' here refers to the point at which we're creating a new 101 * directory via "mkdir()", but also when we're expanding an inline 102 * directory. In either case, we don't yet have the indexing bit set 103 * on the directory, so the standard checks will fail in when metaecc 104 * is turned off. Only directory-initialization type functions should 105 * use this then. Everything else wants ocfs2_supports_dir_trailer() 106 */ 107 static int ocfs2_new_dir_wants_trailer(struct inode *dir) 108 { 109 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 110 111 return ocfs2_meta_ecc(osb) || 112 ocfs2_supports_indexed_dirs(osb); 113 } 114 115 static inline unsigned int ocfs2_dir_trailer_blk_off(struct super_block *sb) 116 { 117 return sb->s_blocksize - sizeof(struct ocfs2_dir_block_trailer); 118 } 119 120 #define ocfs2_trailer_from_bh(_bh, _sb) ((struct ocfs2_dir_block_trailer *) ((_bh)->b_data + ocfs2_dir_trailer_blk_off((_sb)))) 121 122 /* XXX ocfs2_block_dqtrailer() is similar but not quite - can we make 123 * them more consistent? */ 124 struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize, 125 void *data) 126 { 127 char *p = data; 128 129 p += blocksize - sizeof(struct ocfs2_dir_block_trailer); 130 return (struct ocfs2_dir_block_trailer *)p; 131 } 132 133 /* 134 * XXX: This is executed once on every dirent. We should consider optimizing 135 * it. 136 */ 137 static int ocfs2_skip_dir_trailer(struct inode *dir, 138 struct ocfs2_dir_entry *de, 139 unsigned long offset, 140 unsigned long blklen) 141 { 142 unsigned long toff = blklen - sizeof(struct ocfs2_dir_block_trailer); 143 144 if (!ocfs2_supports_dir_trailer(dir)) 145 return 0; 146 147 if (offset != toff) 148 return 0; 149 150 return 1; 151 } 152 153 static void ocfs2_init_dir_trailer(struct inode *inode, 154 struct buffer_head *bh, u16 rec_len) 155 { 156 struct ocfs2_dir_block_trailer *trailer; 157 158 trailer = ocfs2_trailer_from_bh(bh, inode->i_sb); 159 strcpy(trailer->db_signature, OCFS2_DIR_TRAILER_SIGNATURE); 160 trailer->db_compat_rec_len = 161 cpu_to_le16(sizeof(struct ocfs2_dir_block_trailer)); 162 trailer->db_parent_dinode = cpu_to_le64(OCFS2_I(inode)->ip_blkno); 163 trailer->db_blkno = cpu_to_le64(bh->b_blocknr); 164 trailer->db_free_rec_len = cpu_to_le16(rec_len); 165 } 166 /* 167 * Link an unindexed block with a dir trailer structure into the index free 168 * list. This function will modify dirdata_bh, but assumes you've already 169 * passed it to the journal. 170 */ 171 static int ocfs2_dx_dir_link_trailer(struct inode *dir, handle_t *handle, 172 struct buffer_head *dx_root_bh, 173 struct buffer_head *dirdata_bh) 174 { 175 int ret; 176 struct ocfs2_dx_root_block *dx_root; 177 struct ocfs2_dir_block_trailer *trailer; 178 179 ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh, 180 OCFS2_JOURNAL_ACCESS_WRITE); 181 if (ret) { 182 mlog_errno(ret); 183 goto out; 184 } 185 trailer = ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb); 186 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 187 188 trailer->db_free_next = dx_root->dr_free_blk; 189 dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr); 190 191 ocfs2_journal_dirty(handle, dx_root_bh); 192 193 out: 194 return ret; 195 } 196 197 static int ocfs2_free_list_at_root(struct ocfs2_dir_lookup_result *res) 198 { 199 return res->dl_prev_leaf_bh == NULL; 200 } 201 202 void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res) 203 { 204 brelse(res->dl_dx_root_bh); 205 brelse(res->dl_leaf_bh); 206 brelse(res->dl_dx_leaf_bh); 207 brelse(res->dl_prev_leaf_bh); 208 } 209 210 static int ocfs2_dir_indexed(struct inode *inode) 211 { 212 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INDEXED_DIR_FL) 213 return 1; 214 return 0; 215 } 216 217 static inline int ocfs2_dx_root_inline(struct ocfs2_dx_root_block *dx_root) 218 { 219 return dx_root->dr_flags & OCFS2_DX_FLAG_INLINE; 220 } 221 222 /* 223 * Hashing code adapted from ext3 224 */ 225 #define DELTA 0x9E3779B9 226 227 static void TEA_transform(__u32 buf[4], __u32 const in[]) 228 { 229 __u32 sum = 0; 230 __u32 b0 = buf[0], b1 = buf[1]; 231 __u32 a = in[0], b = in[1], c = in[2], d = in[3]; 232 int n = 16; 233 234 do { 235 sum += DELTA; 236 b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b); 237 b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d); 238 } while (--n); 239 240 buf[0] += b0; 241 buf[1] += b1; 242 } 243 244 static void str2hashbuf(const char *msg, int len, __u32 *buf, int num) 245 { 246 __u32 pad, val; 247 int i; 248 249 pad = (__u32)len | ((__u32)len << 8); 250 pad |= pad << 16; 251 252 val = pad; 253 if (len > num*4) 254 len = num * 4; 255 for (i = 0; i < len; i++) { 256 if ((i % 4) == 0) 257 val = pad; 258 val = msg[i] + (val << 8); 259 if ((i % 4) == 3) { 260 *buf++ = val; 261 val = pad; 262 num--; 263 } 264 } 265 if (--num >= 0) 266 *buf++ = val; 267 while (--num >= 0) 268 *buf++ = pad; 269 } 270 271 static void ocfs2_dx_dir_name_hash(struct inode *dir, const char *name, int len, 272 struct ocfs2_dx_hinfo *hinfo) 273 { 274 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 275 const char *p; 276 __u32 in[8], buf[4]; 277 278 /* 279 * XXX: Is this really necessary, if the index is never looked 280 * at by readdir? Is a hash value of '0' a bad idea? 281 */ 282 if ((len == 1 && !strncmp(".", name, 1)) || 283 (len == 2 && !strncmp("..", name, 2))) { 284 buf[0] = buf[1] = 0; 285 goto out; 286 } 287 288 #ifdef OCFS2_DEBUG_DX_DIRS 289 /* 290 * This makes it very easy to debug indexing problems. We 291 * should never allow this to be selected without hand editing 292 * this file though. 293 */ 294 buf[0] = buf[1] = len; 295 goto out; 296 #endif 297 298 memcpy(buf, osb->osb_dx_seed, sizeof(buf)); 299 300 p = name; 301 while (len > 0) { 302 str2hashbuf(p, len, in, 4); 303 TEA_transform(buf, in); 304 len -= 16; 305 p += 16; 306 } 307 308 out: 309 hinfo->major_hash = buf[0]; 310 hinfo->minor_hash = buf[1]; 311 } 312 313 /* 314 * bh passed here can be an inode block or a dir data block, depending 315 * on the inode inline data flag. 316 */ 317 static int ocfs2_check_dir_entry(struct inode * dir, 318 struct ocfs2_dir_entry * de, 319 struct buffer_head * bh, 320 unsigned long offset) 321 { 322 const char *error_msg = NULL; 323 const int rlen = le16_to_cpu(de->rec_len); 324 325 if (rlen < OCFS2_DIR_REC_LEN(1)) 326 error_msg = "rec_len is smaller than minimal"; 327 else if (rlen % 4 != 0) 328 error_msg = "rec_len % 4 != 0"; 329 else if (rlen < OCFS2_DIR_REC_LEN(de->name_len)) 330 error_msg = "rec_len is too small for name_len"; 331 else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize) 332 error_msg = "directory entry across blocks"; 333 334 if (error_msg != NULL) 335 mlog(ML_ERROR, "bad entry in directory #%llu: %s - " 336 "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n", 337 (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg, 338 offset, (unsigned long long)le64_to_cpu(de->inode), rlen, 339 de->name_len); 340 return error_msg == NULL ? 1 : 0; 341 } 342 343 static inline int ocfs2_match(int len, 344 const char * const name, 345 struct ocfs2_dir_entry *de) 346 { 347 if (len != de->name_len) 348 return 0; 349 if (!de->inode) 350 return 0; 351 return !memcmp(name, de->name, len); 352 } 353 354 /* 355 * Returns 0 if not found, -1 on failure, and 1 on success 356 */ 357 static int inline ocfs2_search_dirblock(struct buffer_head *bh, 358 struct inode *dir, 359 const char *name, int namelen, 360 unsigned long offset, 361 char *first_de, 362 unsigned int bytes, 363 struct ocfs2_dir_entry **res_dir) 364 { 365 struct ocfs2_dir_entry *de; 366 char *dlimit, *de_buf; 367 int de_len; 368 int ret = 0; 369 370 mlog_entry_void(); 371 372 de_buf = first_de; 373 dlimit = de_buf + bytes; 374 375 while (de_buf < dlimit) { 376 /* this code is executed quadratically often */ 377 /* do minimal checking `by hand' */ 378 379 de = (struct ocfs2_dir_entry *) de_buf; 380 381 if (de_buf + namelen <= dlimit && 382 ocfs2_match(namelen, name, de)) { 383 /* found a match - just to be sure, do a full check */ 384 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { 385 ret = -1; 386 goto bail; 387 } 388 *res_dir = de; 389 ret = 1; 390 goto bail; 391 } 392 393 /* prevent looping on a bad block */ 394 de_len = le16_to_cpu(de->rec_len); 395 if (de_len <= 0) { 396 ret = -1; 397 goto bail; 398 } 399 400 de_buf += de_len; 401 offset += de_len; 402 } 403 404 bail: 405 mlog_exit(ret); 406 return ret; 407 } 408 409 static struct buffer_head *ocfs2_find_entry_id(const char *name, 410 int namelen, 411 struct inode *dir, 412 struct ocfs2_dir_entry **res_dir) 413 { 414 int ret, found; 415 struct buffer_head *di_bh = NULL; 416 struct ocfs2_dinode *di; 417 struct ocfs2_inline_data *data; 418 419 ret = ocfs2_read_inode_block(dir, &di_bh); 420 if (ret) { 421 mlog_errno(ret); 422 goto out; 423 } 424 425 di = (struct ocfs2_dinode *)di_bh->b_data; 426 data = &di->id2.i_data; 427 428 found = ocfs2_search_dirblock(di_bh, dir, name, namelen, 0, 429 data->id_data, i_size_read(dir), res_dir); 430 if (found == 1) 431 return di_bh; 432 433 brelse(di_bh); 434 out: 435 return NULL; 436 } 437 438 static int ocfs2_validate_dir_block(struct super_block *sb, 439 struct buffer_head *bh) 440 { 441 int rc; 442 struct ocfs2_dir_block_trailer *trailer = 443 ocfs2_trailer_from_bh(bh, sb); 444 445 446 /* 447 * We don't validate dirents here, that's handled 448 * in-place when the code walks them. 449 */ 450 mlog(0, "Validating dirblock %llu\n", 451 (unsigned long long)bh->b_blocknr); 452 453 BUG_ON(!buffer_uptodate(bh)); 454 455 /* 456 * If the ecc fails, we return the error but otherwise 457 * leave the filesystem running. We know any error is 458 * local to this block. 459 * 460 * Note that we are safe to call this even if the directory 461 * doesn't have a trailer. Filesystems without metaecc will do 462 * nothing, and filesystems with it will have one. 463 */ 464 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &trailer->db_check); 465 if (rc) 466 mlog(ML_ERROR, "Checksum failed for dinode %llu\n", 467 (unsigned long long)bh->b_blocknr); 468 469 return rc; 470 } 471 472 /* 473 * Validate a directory trailer. 474 * 475 * We check the trailer here rather than in ocfs2_validate_dir_block() 476 * because that function doesn't have the inode to test. 477 */ 478 static int ocfs2_check_dir_trailer(struct inode *dir, struct buffer_head *bh) 479 { 480 int rc = 0; 481 struct ocfs2_dir_block_trailer *trailer; 482 483 trailer = ocfs2_trailer_from_bh(bh, dir->i_sb); 484 if (!OCFS2_IS_VALID_DIR_TRAILER(trailer)) { 485 rc = -EINVAL; 486 ocfs2_error(dir->i_sb, 487 "Invalid dirblock #%llu: " 488 "signature = %.*s\n", 489 (unsigned long long)bh->b_blocknr, 7, 490 trailer->db_signature); 491 goto out; 492 } 493 if (le64_to_cpu(trailer->db_blkno) != bh->b_blocknr) { 494 rc = -EINVAL; 495 ocfs2_error(dir->i_sb, 496 "Directory block #%llu has an invalid " 497 "db_blkno of %llu", 498 (unsigned long long)bh->b_blocknr, 499 (unsigned long long)le64_to_cpu(trailer->db_blkno)); 500 goto out; 501 } 502 if (le64_to_cpu(trailer->db_parent_dinode) != 503 OCFS2_I(dir)->ip_blkno) { 504 rc = -EINVAL; 505 ocfs2_error(dir->i_sb, 506 "Directory block #%llu on dinode " 507 "#%llu has an invalid parent_dinode " 508 "of %llu", 509 (unsigned long long)bh->b_blocknr, 510 (unsigned long long)OCFS2_I(dir)->ip_blkno, 511 (unsigned long long)le64_to_cpu(trailer->db_blkno)); 512 goto out; 513 } 514 out: 515 return rc; 516 } 517 518 /* 519 * This function forces all errors to -EIO for consistency with its 520 * predecessor, ocfs2_bread(). We haven't audited what returning the 521 * real error codes would do to callers. We log the real codes with 522 * mlog_errno() before we squash them. 523 */ 524 static int ocfs2_read_dir_block(struct inode *inode, u64 v_block, 525 struct buffer_head **bh, int flags) 526 { 527 int rc = 0; 528 struct buffer_head *tmp = *bh; 529 530 rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, flags, 531 ocfs2_validate_dir_block); 532 if (rc) { 533 mlog_errno(rc); 534 goto out; 535 } 536 537 if (!(flags & OCFS2_BH_READAHEAD) && 538 ocfs2_supports_dir_trailer(inode)) { 539 rc = ocfs2_check_dir_trailer(inode, tmp); 540 if (rc) { 541 if (!*bh) 542 brelse(tmp); 543 mlog_errno(rc); 544 goto out; 545 } 546 } 547 548 /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */ 549 if (!*bh) 550 *bh = tmp; 551 552 out: 553 return rc ? -EIO : 0; 554 } 555 556 /* 557 * Read the block at 'phys' which belongs to this directory 558 * inode. This function does no virtual->physical block translation - 559 * what's passed in is assumed to be a valid directory block. 560 */ 561 static int ocfs2_read_dir_block_direct(struct inode *dir, u64 phys, 562 struct buffer_head **bh) 563 { 564 int ret; 565 struct buffer_head *tmp = *bh; 566 567 ret = ocfs2_read_block(INODE_CACHE(dir), phys, &tmp, 568 ocfs2_validate_dir_block); 569 if (ret) { 570 mlog_errno(ret); 571 goto out; 572 } 573 574 if (ocfs2_supports_dir_trailer(dir)) { 575 ret = ocfs2_check_dir_trailer(dir, tmp); 576 if (ret) { 577 if (!*bh) 578 brelse(tmp); 579 mlog_errno(ret); 580 goto out; 581 } 582 } 583 584 if (!ret && !*bh) 585 *bh = tmp; 586 out: 587 return ret; 588 } 589 590 static int ocfs2_validate_dx_root(struct super_block *sb, 591 struct buffer_head *bh) 592 { 593 int ret; 594 struct ocfs2_dx_root_block *dx_root; 595 596 BUG_ON(!buffer_uptodate(bh)); 597 598 dx_root = (struct ocfs2_dx_root_block *) bh->b_data; 599 600 ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_root->dr_check); 601 if (ret) { 602 mlog(ML_ERROR, 603 "Checksum failed for dir index root block %llu\n", 604 (unsigned long long)bh->b_blocknr); 605 return ret; 606 } 607 608 if (!OCFS2_IS_VALID_DX_ROOT(dx_root)) { 609 ocfs2_error(sb, 610 "Dir Index Root # %llu has bad signature %.*s", 611 (unsigned long long)le64_to_cpu(dx_root->dr_blkno), 612 7, dx_root->dr_signature); 613 return -EINVAL; 614 } 615 616 return 0; 617 } 618 619 static int ocfs2_read_dx_root(struct inode *dir, struct ocfs2_dinode *di, 620 struct buffer_head **dx_root_bh) 621 { 622 int ret; 623 u64 blkno = le64_to_cpu(di->i_dx_root); 624 struct buffer_head *tmp = *dx_root_bh; 625 626 ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp, 627 ocfs2_validate_dx_root); 628 629 /* If ocfs2_read_block() got us a new bh, pass it up. */ 630 if (!ret && !*dx_root_bh) 631 *dx_root_bh = tmp; 632 633 return ret; 634 } 635 636 static int ocfs2_validate_dx_leaf(struct super_block *sb, 637 struct buffer_head *bh) 638 { 639 int ret; 640 struct ocfs2_dx_leaf *dx_leaf = (struct ocfs2_dx_leaf *)bh->b_data; 641 642 BUG_ON(!buffer_uptodate(bh)); 643 644 ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_leaf->dl_check); 645 if (ret) { 646 mlog(ML_ERROR, 647 "Checksum failed for dir index leaf block %llu\n", 648 (unsigned long long)bh->b_blocknr); 649 return ret; 650 } 651 652 if (!OCFS2_IS_VALID_DX_LEAF(dx_leaf)) { 653 ocfs2_error(sb, "Dir Index Leaf has bad signature %.*s", 654 7, dx_leaf->dl_signature); 655 return -EROFS; 656 } 657 658 return 0; 659 } 660 661 static int ocfs2_read_dx_leaf(struct inode *dir, u64 blkno, 662 struct buffer_head **dx_leaf_bh) 663 { 664 int ret; 665 struct buffer_head *tmp = *dx_leaf_bh; 666 667 ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp, 668 ocfs2_validate_dx_leaf); 669 670 /* If ocfs2_read_block() got us a new bh, pass it up. */ 671 if (!ret && !*dx_leaf_bh) 672 *dx_leaf_bh = tmp; 673 674 return ret; 675 } 676 677 /* 678 * Read a series of dx_leaf blocks. This expects all buffer_head 679 * pointers to be NULL on function entry. 680 */ 681 static int ocfs2_read_dx_leaves(struct inode *dir, u64 start, int num, 682 struct buffer_head **dx_leaf_bhs) 683 { 684 int ret; 685 686 ret = ocfs2_read_blocks(INODE_CACHE(dir), start, num, dx_leaf_bhs, 0, 687 ocfs2_validate_dx_leaf); 688 if (ret) 689 mlog_errno(ret); 690 691 return ret; 692 } 693 694 static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen, 695 struct inode *dir, 696 struct ocfs2_dir_entry **res_dir) 697 { 698 struct super_block *sb; 699 struct buffer_head *bh_use[NAMEI_RA_SIZE]; 700 struct buffer_head *bh, *ret = NULL; 701 unsigned long start, block, b; 702 int ra_max = 0; /* Number of bh's in the readahead 703 buffer, bh_use[] */ 704 int ra_ptr = 0; /* Current index into readahead 705 buffer */ 706 int num = 0; 707 int nblocks, i, err; 708 709 mlog_entry_void(); 710 711 sb = dir->i_sb; 712 713 nblocks = i_size_read(dir) >> sb->s_blocksize_bits; 714 start = OCFS2_I(dir)->ip_dir_start_lookup; 715 if (start >= nblocks) 716 start = 0; 717 block = start; 718 719 restart: 720 do { 721 /* 722 * We deal with the read-ahead logic here. 723 */ 724 if (ra_ptr >= ra_max) { 725 /* Refill the readahead buffer */ 726 ra_ptr = 0; 727 b = block; 728 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { 729 /* 730 * Terminate if we reach the end of the 731 * directory and must wrap, or if our 732 * search has finished at this block. 733 */ 734 if (b >= nblocks || (num && block == start)) { 735 bh_use[ra_max] = NULL; 736 break; 737 } 738 num++; 739 740 bh = NULL; 741 err = ocfs2_read_dir_block(dir, b++, &bh, 742 OCFS2_BH_READAHEAD); 743 bh_use[ra_max] = bh; 744 } 745 } 746 if ((bh = bh_use[ra_ptr++]) == NULL) 747 goto next; 748 if (ocfs2_read_dir_block(dir, block, &bh, 0)) { 749 /* read error, skip block & hope for the best. 750 * ocfs2_read_dir_block() has released the bh. */ 751 ocfs2_error(dir->i_sb, "reading directory %llu, " 752 "offset %lu\n", 753 (unsigned long long)OCFS2_I(dir)->ip_blkno, 754 block); 755 goto next; 756 } 757 i = ocfs2_search_dirblock(bh, dir, name, namelen, 758 block << sb->s_blocksize_bits, 759 bh->b_data, sb->s_blocksize, 760 res_dir); 761 if (i == 1) { 762 OCFS2_I(dir)->ip_dir_start_lookup = block; 763 ret = bh; 764 goto cleanup_and_exit; 765 } else { 766 brelse(bh); 767 if (i < 0) 768 goto cleanup_and_exit; 769 } 770 next: 771 if (++block >= nblocks) 772 block = 0; 773 } while (block != start); 774 775 /* 776 * If the directory has grown while we were searching, then 777 * search the last part of the directory before giving up. 778 */ 779 block = nblocks; 780 nblocks = i_size_read(dir) >> sb->s_blocksize_bits; 781 if (block < nblocks) { 782 start = 0; 783 goto restart; 784 } 785 786 cleanup_and_exit: 787 /* Clean up the read-ahead blocks */ 788 for (; ra_ptr < ra_max; ra_ptr++) 789 brelse(bh_use[ra_ptr]); 790 791 mlog_exit_ptr(ret); 792 return ret; 793 } 794 795 static int ocfs2_dx_dir_lookup_rec(struct inode *inode, 796 struct ocfs2_extent_list *el, 797 u32 major_hash, 798 u32 *ret_cpos, 799 u64 *ret_phys_blkno, 800 unsigned int *ret_clen) 801 { 802 int ret = 0, i, found; 803 struct buffer_head *eb_bh = NULL; 804 struct ocfs2_extent_block *eb; 805 struct ocfs2_extent_rec *rec = NULL; 806 807 if (el->l_tree_depth) { 808 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, major_hash, 809 &eb_bh); 810 if (ret) { 811 mlog_errno(ret); 812 goto out; 813 } 814 815 eb = (struct ocfs2_extent_block *) eb_bh->b_data; 816 el = &eb->h_list; 817 818 if (el->l_tree_depth) { 819 ocfs2_error(inode->i_sb, 820 "Inode %lu has non zero tree depth in " 821 "btree tree block %llu\n", inode->i_ino, 822 (unsigned long long)eb_bh->b_blocknr); 823 ret = -EROFS; 824 goto out; 825 } 826 } 827 828 found = 0; 829 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { 830 rec = &el->l_recs[i]; 831 832 if (le32_to_cpu(rec->e_cpos) <= major_hash) { 833 found = 1; 834 break; 835 } 836 } 837 838 if (!found) { 839 ocfs2_error(inode->i_sb, "Inode %lu has bad extent " 840 "record (%u, %u, 0) in btree", inode->i_ino, 841 le32_to_cpu(rec->e_cpos), 842 ocfs2_rec_clusters(el, rec)); 843 ret = -EROFS; 844 goto out; 845 } 846 847 if (ret_phys_blkno) 848 *ret_phys_blkno = le64_to_cpu(rec->e_blkno); 849 if (ret_cpos) 850 *ret_cpos = le32_to_cpu(rec->e_cpos); 851 if (ret_clen) 852 *ret_clen = le16_to_cpu(rec->e_leaf_clusters); 853 854 out: 855 brelse(eb_bh); 856 return ret; 857 } 858 859 /* 860 * Returns the block index, from the start of the cluster which this 861 * hash belongs too. 862 */ 863 static inline unsigned int __ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb, 864 u32 minor_hash) 865 { 866 return minor_hash & osb->osb_dx_mask; 867 } 868 869 static inline unsigned int ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb, 870 struct ocfs2_dx_hinfo *hinfo) 871 { 872 return __ocfs2_dx_dir_hash_idx(osb, hinfo->minor_hash); 873 } 874 875 static int ocfs2_dx_dir_lookup(struct inode *inode, 876 struct ocfs2_extent_list *el, 877 struct ocfs2_dx_hinfo *hinfo, 878 u32 *ret_cpos, 879 u64 *ret_phys_blkno) 880 { 881 int ret = 0; 882 unsigned int cend, uninitialized_var(clen); 883 u32 uninitialized_var(cpos); 884 u64 uninitialized_var(blkno); 885 u32 name_hash = hinfo->major_hash; 886 887 ret = ocfs2_dx_dir_lookup_rec(inode, el, name_hash, &cpos, &blkno, 888 &clen); 889 if (ret) { 890 mlog_errno(ret); 891 goto out; 892 } 893 894 cend = cpos + clen; 895 if (name_hash >= cend) { 896 /* We want the last cluster */ 897 blkno += ocfs2_clusters_to_blocks(inode->i_sb, clen - 1); 898 cpos += clen - 1; 899 } else { 900 blkno += ocfs2_clusters_to_blocks(inode->i_sb, 901 name_hash - cpos); 902 cpos = name_hash; 903 } 904 905 /* 906 * We now have the cluster which should hold our entry. To 907 * find the exact block from the start of the cluster to 908 * search, we take the lower bits of the hash. 909 */ 910 blkno += ocfs2_dx_dir_hash_idx(OCFS2_SB(inode->i_sb), hinfo); 911 912 if (ret_phys_blkno) 913 *ret_phys_blkno = blkno; 914 if (ret_cpos) 915 *ret_cpos = cpos; 916 917 out: 918 919 return ret; 920 } 921 922 static int ocfs2_dx_dir_search(const char *name, int namelen, 923 struct inode *dir, 924 struct ocfs2_dx_root_block *dx_root, 925 struct ocfs2_dir_lookup_result *res) 926 { 927 int ret, i, found; 928 u64 uninitialized_var(phys); 929 struct buffer_head *dx_leaf_bh = NULL; 930 struct ocfs2_dx_leaf *dx_leaf; 931 struct ocfs2_dx_entry *dx_entry = NULL; 932 struct buffer_head *dir_ent_bh = NULL; 933 struct ocfs2_dir_entry *dir_ent = NULL; 934 struct ocfs2_dx_hinfo *hinfo = &res->dl_hinfo; 935 struct ocfs2_extent_list *dr_el; 936 struct ocfs2_dx_entry_list *entry_list; 937 938 ocfs2_dx_dir_name_hash(dir, name, namelen, &res->dl_hinfo); 939 940 if (ocfs2_dx_root_inline(dx_root)) { 941 entry_list = &dx_root->dr_entries; 942 goto search; 943 } 944 945 dr_el = &dx_root->dr_list; 946 947 ret = ocfs2_dx_dir_lookup(dir, dr_el, hinfo, NULL, &phys); 948 if (ret) { 949 mlog_errno(ret); 950 goto out; 951 } 952 953 mlog(0, "Dir %llu: name: \"%.*s\", lookup of hash: %u.0x%x " 954 "returns: %llu\n", 955 (unsigned long long)OCFS2_I(dir)->ip_blkno, 956 namelen, name, hinfo->major_hash, hinfo->minor_hash, 957 (unsigned long long)phys); 958 959 ret = ocfs2_read_dx_leaf(dir, phys, &dx_leaf_bh); 960 if (ret) { 961 mlog_errno(ret); 962 goto out; 963 } 964 965 dx_leaf = (struct ocfs2_dx_leaf *) dx_leaf_bh->b_data; 966 967 mlog(0, "leaf info: num_used: %d, count: %d\n", 968 le16_to_cpu(dx_leaf->dl_list.de_num_used), 969 le16_to_cpu(dx_leaf->dl_list.de_count)); 970 971 entry_list = &dx_leaf->dl_list; 972 973 search: 974 /* 975 * Empty leaf is legal, so no need to check for that. 976 */ 977 found = 0; 978 for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) { 979 dx_entry = &entry_list->de_entries[i]; 980 981 if (hinfo->major_hash != le32_to_cpu(dx_entry->dx_major_hash) 982 || hinfo->minor_hash != le32_to_cpu(dx_entry->dx_minor_hash)) 983 continue; 984 985 /* 986 * Search unindexed leaf block now. We're not 987 * guaranteed to find anything. 988 */ 989 ret = ocfs2_read_dir_block_direct(dir, 990 le64_to_cpu(dx_entry->dx_dirent_blk), 991 &dir_ent_bh); 992 if (ret) { 993 mlog_errno(ret); 994 goto out; 995 } 996 997 /* 998 * XXX: We should check the unindexed block here, 999 * before using it. 1000 */ 1001 1002 found = ocfs2_search_dirblock(dir_ent_bh, dir, name, namelen, 1003 0, dir_ent_bh->b_data, 1004 dir->i_sb->s_blocksize, &dir_ent); 1005 if (found == 1) 1006 break; 1007 1008 if (found == -1) { 1009 /* This means we found a bad directory entry. */ 1010 ret = -EIO; 1011 mlog_errno(ret); 1012 goto out; 1013 } 1014 1015 brelse(dir_ent_bh); 1016 dir_ent_bh = NULL; 1017 } 1018 1019 if (found <= 0) { 1020 ret = -ENOENT; 1021 goto out; 1022 } 1023 1024 res->dl_leaf_bh = dir_ent_bh; 1025 res->dl_entry = dir_ent; 1026 res->dl_dx_leaf_bh = dx_leaf_bh; 1027 res->dl_dx_entry = dx_entry; 1028 1029 ret = 0; 1030 out: 1031 if (ret) { 1032 brelse(dx_leaf_bh); 1033 brelse(dir_ent_bh); 1034 } 1035 return ret; 1036 } 1037 1038 static int ocfs2_find_entry_dx(const char *name, int namelen, 1039 struct inode *dir, 1040 struct ocfs2_dir_lookup_result *lookup) 1041 { 1042 int ret; 1043 struct buffer_head *di_bh = NULL; 1044 struct ocfs2_dinode *di; 1045 struct buffer_head *dx_root_bh = NULL; 1046 struct ocfs2_dx_root_block *dx_root; 1047 1048 ret = ocfs2_read_inode_block(dir, &di_bh); 1049 if (ret) { 1050 mlog_errno(ret); 1051 goto out; 1052 } 1053 1054 di = (struct ocfs2_dinode *)di_bh->b_data; 1055 1056 ret = ocfs2_read_dx_root(dir, di, &dx_root_bh); 1057 if (ret) { 1058 mlog_errno(ret); 1059 goto out; 1060 } 1061 dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data; 1062 1063 ret = ocfs2_dx_dir_search(name, namelen, dir, dx_root, lookup); 1064 if (ret) { 1065 if (ret != -ENOENT) 1066 mlog_errno(ret); 1067 goto out; 1068 } 1069 1070 lookup->dl_dx_root_bh = dx_root_bh; 1071 dx_root_bh = NULL; 1072 out: 1073 brelse(di_bh); 1074 brelse(dx_root_bh); 1075 return ret; 1076 } 1077 1078 /* 1079 * Try to find an entry of the provided name within 'dir'. 1080 * 1081 * If nothing was found, -ENOENT is returned. Otherwise, zero is 1082 * returned and the struct 'res' will contain information useful to 1083 * other directory manipulation functions. 1084 * 1085 * Caller can NOT assume anything about the contents of the 1086 * buffer_heads - they are passed back only so that it can be passed 1087 * into any one of the manipulation functions (add entry, delete 1088 * entry, etc). As an example, bh in the extent directory case is a 1089 * data block, in the inline-data case it actually points to an inode, 1090 * in the indexed directory case, multiple buffers are involved. 1091 */ 1092 int ocfs2_find_entry(const char *name, int namelen, 1093 struct inode *dir, struct ocfs2_dir_lookup_result *lookup) 1094 { 1095 struct buffer_head *bh; 1096 struct ocfs2_dir_entry *res_dir = NULL; 1097 1098 if (ocfs2_dir_indexed(dir)) 1099 return ocfs2_find_entry_dx(name, namelen, dir, lookup); 1100 1101 /* 1102 * The unindexed dir code only uses part of the lookup 1103 * structure, so there's no reason to push it down further 1104 * than this. 1105 */ 1106 if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) 1107 bh = ocfs2_find_entry_id(name, namelen, dir, &res_dir); 1108 else 1109 bh = ocfs2_find_entry_el(name, namelen, dir, &res_dir); 1110 1111 if (bh == NULL) 1112 return -ENOENT; 1113 1114 lookup->dl_leaf_bh = bh; 1115 lookup->dl_entry = res_dir; 1116 return 0; 1117 } 1118 1119 /* 1120 * Update inode number and type of a previously found directory entry. 1121 */ 1122 int ocfs2_update_entry(struct inode *dir, handle_t *handle, 1123 struct ocfs2_dir_lookup_result *res, 1124 struct inode *new_entry_inode) 1125 { 1126 int ret; 1127 ocfs2_journal_access_func access = ocfs2_journal_access_db; 1128 struct ocfs2_dir_entry *de = res->dl_entry; 1129 struct buffer_head *de_bh = res->dl_leaf_bh; 1130 1131 /* 1132 * The same code works fine for both inline-data and extent 1133 * based directories, so no need to split this up. The only 1134 * difference is the journal_access function. 1135 */ 1136 1137 if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) 1138 access = ocfs2_journal_access_di; 1139 1140 ret = access(handle, INODE_CACHE(dir), de_bh, 1141 OCFS2_JOURNAL_ACCESS_WRITE); 1142 if (ret) { 1143 mlog_errno(ret); 1144 goto out; 1145 } 1146 1147 de->inode = cpu_to_le64(OCFS2_I(new_entry_inode)->ip_blkno); 1148 ocfs2_set_de_type(de, new_entry_inode->i_mode); 1149 1150 ocfs2_journal_dirty(handle, de_bh); 1151 1152 out: 1153 return ret; 1154 } 1155 1156 /* 1157 * __ocfs2_delete_entry deletes a directory entry by merging it with the 1158 * previous entry 1159 */ 1160 static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir, 1161 struct ocfs2_dir_entry *de_del, 1162 struct buffer_head *bh, char *first_de, 1163 unsigned int bytes) 1164 { 1165 struct ocfs2_dir_entry *de, *pde; 1166 int i, status = -ENOENT; 1167 ocfs2_journal_access_func access = ocfs2_journal_access_db; 1168 1169 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh); 1170 1171 if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) 1172 access = ocfs2_journal_access_di; 1173 1174 i = 0; 1175 pde = NULL; 1176 de = (struct ocfs2_dir_entry *) first_de; 1177 while (i < bytes) { 1178 if (!ocfs2_check_dir_entry(dir, de, bh, i)) { 1179 status = -EIO; 1180 mlog_errno(status); 1181 goto bail; 1182 } 1183 if (de == de_del) { 1184 status = access(handle, INODE_CACHE(dir), bh, 1185 OCFS2_JOURNAL_ACCESS_WRITE); 1186 if (status < 0) { 1187 status = -EIO; 1188 mlog_errno(status); 1189 goto bail; 1190 } 1191 if (pde) 1192 le16_add_cpu(&pde->rec_len, 1193 le16_to_cpu(de->rec_len)); 1194 else 1195 de->inode = 0; 1196 dir->i_version++; 1197 ocfs2_journal_dirty(handle, bh); 1198 goto bail; 1199 } 1200 i += le16_to_cpu(de->rec_len); 1201 pde = de; 1202 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len)); 1203 } 1204 bail: 1205 mlog_exit(status); 1206 return status; 1207 } 1208 1209 static unsigned int ocfs2_figure_dirent_hole(struct ocfs2_dir_entry *de) 1210 { 1211 unsigned int hole; 1212 1213 if (le64_to_cpu(de->inode) == 0) 1214 hole = le16_to_cpu(de->rec_len); 1215 else 1216 hole = le16_to_cpu(de->rec_len) - 1217 OCFS2_DIR_REC_LEN(de->name_len); 1218 1219 return hole; 1220 } 1221 1222 static int ocfs2_find_max_rec_len(struct super_block *sb, 1223 struct buffer_head *dirblock_bh) 1224 { 1225 int size, this_hole, largest_hole = 0; 1226 char *trailer, *de_buf, *limit, *start = dirblock_bh->b_data; 1227 struct ocfs2_dir_entry *de; 1228 1229 trailer = (char *)ocfs2_trailer_from_bh(dirblock_bh, sb); 1230 size = ocfs2_dir_trailer_blk_off(sb); 1231 limit = start + size; 1232 de_buf = start; 1233 de = (struct ocfs2_dir_entry *)de_buf; 1234 do { 1235 if (de_buf != trailer) { 1236 this_hole = ocfs2_figure_dirent_hole(de); 1237 if (this_hole > largest_hole) 1238 largest_hole = this_hole; 1239 } 1240 1241 de_buf += le16_to_cpu(de->rec_len); 1242 de = (struct ocfs2_dir_entry *)de_buf; 1243 } while (de_buf < limit); 1244 1245 if (largest_hole >= OCFS2_DIR_MIN_REC_LEN) 1246 return largest_hole; 1247 return 0; 1248 } 1249 1250 static void ocfs2_dx_list_remove_entry(struct ocfs2_dx_entry_list *entry_list, 1251 int index) 1252 { 1253 int num_used = le16_to_cpu(entry_list->de_num_used); 1254 1255 if (num_used == 1 || index == (num_used - 1)) 1256 goto clear; 1257 1258 memmove(&entry_list->de_entries[index], 1259 &entry_list->de_entries[index + 1], 1260 (num_used - index - 1)*sizeof(struct ocfs2_dx_entry)); 1261 clear: 1262 num_used--; 1263 memset(&entry_list->de_entries[num_used], 0, 1264 sizeof(struct ocfs2_dx_entry)); 1265 entry_list->de_num_used = cpu_to_le16(num_used); 1266 } 1267 1268 static int ocfs2_delete_entry_dx(handle_t *handle, struct inode *dir, 1269 struct ocfs2_dir_lookup_result *lookup) 1270 { 1271 int ret, index, max_rec_len, add_to_free_list = 0; 1272 struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh; 1273 struct buffer_head *leaf_bh = lookup->dl_leaf_bh; 1274 struct ocfs2_dx_leaf *dx_leaf; 1275 struct ocfs2_dx_entry *dx_entry = lookup->dl_dx_entry; 1276 struct ocfs2_dir_block_trailer *trailer; 1277 struct ocfs2_dx_root_block *dx_root; 1278 struct ocfs2_dx_entry_list *entry_list; 1279 1280 /* 1281 * This function gets a bit messy because we might have to 1282 * modify the root block, regardless of whether the indexed 1283 * entries are stored inline. 1284 */ 1285 1286 /* 1287 * *Only* set 'entry_list' here, based on where we're looking 1288 * for the indexed entries. Later, we might still want to 1289 * journal both blocks, based on free list state. 1290 */ 1291 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 1292 if (ocfs2_dx_root_inline(dx_root)) { 1293 entry_list = &dx_root->dr_entries; 1294 } else { 1295 dx_leaf = (struct ocfs2_dx_leaf *) lookup->dl_dx_leaf_bh->b_data; 1296 entry_list = &dx_leaf->dl_list; 1297 } 1298 1299 /* Neither of these are a disk corruption - that should have 1300 * been caught by lookup, before we got here. */ 1301 BUG_ON(le16_to_cpu(entry_list->de_count) <= 0); 1302 BUG_ON(le16_to_cpu(entry_list->de_num_used) <= 0); 1303 1304 index = (char *)dx_entry - (char *)entry_list->de_entries; 1305 index /= sizeof(*dx_entry); 1306 1307 if (index >= le16_to_cpu(entry_list->de_num_used)) { 1308 mlog(ML_ERROR, "Dir %llu: Bad dx_entry ptr idx %d, (%p, %p)\n", 1309 (unsigned long long)OCFS2_I(dir)->ip_blkno, index, 1310 entry_list, dx_entry); 1311 return -EIO; 1312 } 1313 1314 /* 1315 * We know that removal of this dirent will leave enough room 1316 * for a new one, so add this block to the free list if it 1317 * isn't already there. 1318 */ 1319 trailer = ocfs2_trailer_from_bh(leaf_bh, dir->i_sb); 1320 if (trailer->db_free_rec_len == 0) 1321 add_to_free_list = 1; 1322 1323 /* 1324 * Add the block holding our index into the journal before 1325 * removing the unindexed entry. If we get an error return 1326 * from __ocfs2_delete_entry(), then it hasn't removed the 1327 * entry yet. Likewise, successful return means we *must* 1328 * remove the indexed entry. 1329 * 1330 * We're also careful to journal the root tree block here as 1331 * the entry count needs to be updated. Also, we might be 1332 * adding to the start of the free list. 1333 */ 1334 ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh, 1335 OCFS2_JOURNAL_ACCESS_WRITE); 1336 if (ret) { 1337 mlog_errno(ret); 1338 goto out; 1339 } 1340 1341 if (!ocfs2_dx_root_inline(dx_root)) { 1342 ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), 1343 lookup->dl_dx_leaf_bh, 1344 OCFS2_JOURNAL_ACCESS_WRITE); 1345 if (ret) { 1346 mlog_errno(ret); 1347 goto out; 1348 } 1349 } 1350 1351 mlog(0, "Dir %llu: delete entry at index: %d\n", 1352 (unsigned long long)OCFS2_I(dir)->ip_blkno, index); 1353 1354 ret = __ocfs2_delete_entry(handle, dir, lookup->dl_entry, 1355 leaf_bh, leaf_bh->b_data, leaf_bh->b_size); 1356 if (ret) { 1357 mlog_errno(ret); 1358 goto out; 1359 } 1360 1361 max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, leaf_bh); 1362 trailer->db_free_rec_len = cpu_to_le16(max_rec_len); 1363 if (add_to_free_list) { 1364 trailer->db_free_next = dx_root->dr_free_blk; 1365 dx_root->dr_free_blk = cpu_to_le64(leaf_bh->b_blocknr); 1366 ocfs2_journal_dirty(handle, dx_root_bh); 1367 } 1368 1369 /* leaf_bh was journal_accessed for us in __ocfs2_delete_entry */ 1370 ocfs2_journal_dirty(handle, leaf_bh); 1371 1372 le32_add_cpu(&dx_root->dr_num_entries, -1); 1373 ocfs2_journal_dirty(handle, dx_root_bh); 1374 1375 ocfs2_dx_list_remove_entry(entry_list, index); 1376 1377 if (!ocfs2_dx_root_inline(dx_root)) 1378 ocfs2_journal_dirty(handle, lookup->dl_dx_leaf_bh); 1379 1380 out: 1381 return ret; 1382 } 1383 1384 static inline int ocfs2_delete_entry_id(handle_t *handle, 1385 struct inode *dir, 1386 struct ocfs2_dir_entry *de_del, 1387 struct buffer_head *bh) 1388 { 1389 int ret; 1390 struct buffer_head *di_bh = NULL; 1391 struct ocfs2_dinode *di; 1392 struct ocfs2_inline_data *data; 1393 1394 ret = ocfs2_read_inode_block(dir, &di_bh); 1395 if (ret) { 1396 mlog_errno(ret); 1397 goto out; 1398 } 1399 1400 di = (struct ocfs2_dinode *)di_bh->b_data; 1401 data = &di->id2.i_data; 1402 1403 ret = __ocfs2_delete_entry(handle, dir, de_del, bh, data->id_data, 1404 i_size_read(dir)); 1405 1406 brelse(di_bh); 1407 out: 1408 return ret; 1409 } 1410 1411 static inline int ocfs2_delete_entry_el(handle_t *handle, 1412 struct inode *dir, 1413 struct ocfs2_dir_entry *de_del, 1414 struct buffer_head *bh) 1415 { 1416 return __ocfs2_delete_entry(handle, dir, de_del, bh, bh->b_data, 1417 bh->b_size); 1418 } 1419 1420 /* 1421 * Delete a directory entry. Hide the details of directory 1422 * implementation from the caller. 1423 */ 1424 int ocfs2_delete_entry(handle_t *handle, 1425 struct inode *dir, 1426 struct ocfs2_dir_lookup_result *res) 1427 { 1428 if (ocfs2_dir_indexed(dir)) 1429 return ocfs2_delete_entry_dx(handle, dir, res); 1430 1431 if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) 1432 return ocfs2_delete_entry_id(handle, dir, res->dl_entry, 1433 res->dl_leaf_bh); 1434 1435 return ocfs2_delete_entry_el(handle, dir, res->dl_entry, 1436 res->dl_leaf_bh); 1437 } 1438 1439 /* 1440 * Check whether 'de' has enough room to hold an entry of 1441 * 'new_rec_len' bytes. 1442 */ 1443 static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de, 1444 unsigned int new_rec_len) 1445 { 1446 unsigned int de_really_used; 1447 1448 /* Check whether this is an empty record with enough space */ 1449 if (le64_to_cpu(de->inode) == 0 && 1450 le16_to_cpu(de->rec_len) >= new_rec_len) 1451 return 1; 1452 1453 /* 1454 * Record might have free space at the end which we can 1455 * use. 1456 */ 1457 de_really_used = OCFS2_DIR_REC_LEN(de->name_len); 1458 if (le16_to_cpu(de->rec_len) >= (de_really_used + new_rec_len)) 1459 return 1; 1460 1461 return 0; 1462 } 1463 1464 static void ocfs2_dx_dir_leaf_insert_tail(struct ocfs2_dx_leaf *dx_leaf, 1465 struct ocfs2_dx_entry *dx_new_entry) 1466 { 1467 int i; 1468 1469 i = le16_to_cpu(dx_leaf->dl_list.de_num_used); 1470 dx_leaf->dl_list.de_entries[i] = *dx_new_entry; 1471 1472 le16_add_cpu(&dx_leaf->dl_list.de_num_used, 1); 1473 } 1474 1475 static void ocfs2_dx_entry_list_insert(struct ocfs2_dx_entry_list *entry_list, 1476 struct ocfs2_dx_hinfo *hinfo, 1477 u64 dirent_blk) 1478 { 1479 int i; 1480 struct ocfs2_dx_entry *dx_entry; 1481 1482 i = le16_to_cpu(entry_list->de_num_used); 1483 dx_entry = &entry_list->de_entries[i]; 1484 1485 memset(dx_entry, 0, sizeof(*dx_entry)); 1486 dx_entry->dx_major_hash = cpu_to_le32(hinfo->major_hash); 1487 dx_entry->dx_minor_hash = cpu_to_le32(hinfo->minor_hash); 1488 dx_entry->dx_dirent_blk = cpu_to_le64(dirent_blk); 1489 1490 le16_add_cpu(&entry_list->de_num_used, 1); 1491 } 1492 1493 static int __ocfs2_dx_dir_leaf_insert(struct inode *dir, handle_t *handle, 1494 struct ocfs2_dx_hinfo *hinfo, 1495 u64 dirent_blk, 1496 struct buffer_head *dx_leaf_bh) 1497 { 1498 int ret; 1499 struct ocfs2_dx_leaf *dx_leaf; 1500 1501 ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), dx_leaf_bh, 1502 OCFS2_JOURNAL_ACCESS_WRITE); 1503 if (ret) { 1504 mlog_errno(ret); 1505 goto out; 1506 } 1507 1508 dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data; 1509 ocfs2_dx_entry_list_insert(&dx_leaf->dl_list, hinfo, dirent_blk); 1510 ocfs2_journal_dirty(handle, dx_leaf_bh); 1511 1512 out: 1513 return ret; 1514 } 1515 1516 static void ocfs2_dx_inline_root_insert(struct inode *dir, handle_t *handle, 1517 struct ocfs2_dx_hinfo *hinfo, 1518 u64 dirent_blk, 1519 struct ocfs2_dx_root_block *dx_root) 1520 { 1521 ocfs2_dx_entry_list_insert(&dx_root->dr_entries, hinfo, dirent_blk); 1522 } 1523 1524 static int ocfs2_dx_dir_insert(struct inode *dir, handle_t *handle, 1525 struct ocfs2_dir_lookup_result *lookup) 1526 { 1527 int ret = 0; 1528 struct ocfs2_dx_root_block *dx_root; 1529 struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh; 1530 1531 ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh, 1532 OCFS2_JOURNAL_ACCESS_WRITE); 1533 if (ret) { 1534 mlog_errno(ret); 1535 goto out; 1536 } 1537 1538 dx_root = (struct ocfs2_dx_root_block *)lookup->dl_dx_root_bh->b_data; 1539 if (ocfs2_dx_root_inline(dx_root)) { 1540 ocfs2_dx_inline_root_insert(dir, handle, 1541 &lookup->dl_hinfo, 1542 lookup->dl_leaf_bh->b_blocknr, 1543 dx_root); 1544 } else { 1545 ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &lookup->dl_hinfo, 1546 lookup->dl_leaf_bh->b_blocknr, 1547 lookup->dl_dx_leaf_bh); 1548 if (ret) 1549 goto out; 1550 } 1551 1552 le32_add_cpu(&dx_root->dr_num_entries, 1); 1553 ocfs2_journal_dirty(handle, dx_root_bh); 1554 1555 out: 1556 return ret; 1557 } 1558 1559 static void ocfs2_remove_block_from_free_list(struct inode *dir, 1560 handle_t *handle, 1561 struct ocfs2_dir_lookup_result *lookup) 1562 { 1563 struct ocfs2_dir_block_trailer *trailer, *prev; 1564 struct ocfs2_dx_root_block *dx_root; 1565 struct buffer_head *bh; 1566 1567 trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb); 1568 1569 if (ocfs2_free_list_at_root(lookup)) { 1570 bh = lookup->dl_dx_root_bh; 1571 dx_root = (struct ocfs2_dx_root_block *)bh->b_data; 1572 dx_root->dr_free_blk = trailer->db_free_next; 1573 } else { 1574 bh = lookup->dl_prev_leaf_bh; 1575 prev = ocfs2_trailer_from_bh(bh, dir->i_sb); 1576 prev->db_free_next = trailer->db_free_next; 1577 } 1578 1579 trailer->db_free_rec_len = cpu_to_le16(0); 1580 trailer->db_free_next = cpu_to_le64(0); 1581 1582 ocfs2_journal_dirty(handle, bh); 1583 ocfs2_journal_dirty(handle, lookup->dl_leaf_bh); 1584 } 1585 1586 /* 1587 * This expects that a journal write has been reserved on 1588 * lookup->dl_prev_leaf_bh or lookup->dl_dx_root_bh 1589 */ 1590 static void ocfs2_recalc_free_list(struct inode *dir, handle_t *handle, 1591 struct ocfs2_dir_lookup_result *lookup) 1592 { 1593 int max_rec_len; 1594 struct ocfs2_dir_block_trailer *trailer; 1595 1596 /* Walk dl_leaf_bh to figure out what the new free rec_len is. */ 1597 max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, lookup->dl_leaf_bh); 1598 if (max_rec_len) { 1599 /* 1600 * There's still room in this block, so no need to remove it 1601 * from the free list. In this case, we just want to update 1602 * the rec len accounting. 1603 */ 1604 trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb); 1605 trailer->db_free_rec_len = cpu_to_le16(max_rec_len); 1606 ocfs2_journal_dirty(handle, lookup->dl_leaf_bh); 1607 } else { 1608 ocfs2_remove_block_from_free_list(dir, handle, lookup); 1609 } 1610 } 1611 1612 /* we don't always have a dentry for what we want to add, so people 1613 * like orphan dir can call this instead. 1614 * 1615 * The lookup context must have been filled from 1616 * ocfs2_prepare_dir_for_insert. 1617 */ 1618 int __ocfs2_add_entry(handle_t *handle, 1619 struct inode *dir, 1620 const char *name, int namelen, 1621 struct inode *inode, u64 blkno, 1622 struct buffer_head *parent_fe_bh, 1623 struct ocfs2_dir_lookup_result *lookup) 1624 { 1625 unsigned long offset; 1626 unsigned short rec_len; 1627 struct ocfs2_dir_entry *de, *de1; 1628 struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_fe_bh->b_data; 1629 struct super_block *sb = dir->i_sb; 1630 int retval, status; 1631 unsigned int size = sb->s_blocksize; 1632 struct buffer_head *insert_bh = lookup->dl_leaf_bh; 1633 char *data_start = insert_bh->b_data; 1634 1635 mlog_entry_void(); 1636 1637 if (!namelen) 1638 return -EINVAL; 1639 1640 if (ocfs2_dir_indexed(dir)) { 1641 struct buffer_head *bh; 1642 1643 /* 1644 * An indexed dir may require that we update the free space 1645 * list. Reserve a write to the previous node in the list so 1646 * that we don't fail later. 1647 * 1648 * XXX: This can be either a dx_root_block, or an unindexed 1649 * directory tree leaf block. 1650 */ 1651 if (ocfs2_free_list_at_root(lookup)) { 1652 bh = lookup->dl_dx_root_bh; 1653 retval = ocfs2_journal_access_dr(handle, 1654 INODE_CACHE(dir), bh, 1655 OCFS2_JOURNAL_ACCESS_WRITE); 1656 } else { 1657 bh = lookup->dl_prev_leaf_bh; 1658 retval = ocfs2_journal_access_db(handle, 1659 INODE_CACHE(dir), bh, 1660 OCFS2_JOURNAL_ACCESS_WRITE); 1661 } 1662 if (retval) { 1663 mlog_errno(retval); 1664 return retval; 1665 } 1666 } else if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1667 data_start = di->id2.i_data.id_data; 1668 size = i_size_read(dir); 1669 1670 BUG_ON(insert_bh != parent_fe_bh); 1671 } 1672 1673 rec_len = OCFS2_DIR_REC_LEN(namelen); 1674 offset = 0; 1675 de = (struct ocfs2_dir_entry *) data_start; 1676 while (1) { 1677 BUG_ON((char *)de >= (size + data_start)); 1678 1679 /* These checks should've already been passed by the 1680 * prepare function, but I guess we can leave them 1681 * here anyway. */ 1682 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) { 1683 retval = -ENOENT; 1684 goto bail; 1685 } 1686 if (ocfs2_match(namelen, name, de)) { 1687 retval = -EEXIST; 1688 goto bail; 1689 } 1690 1691 /* We're guaranteed that we should have space, so we 1692 * can't possibly have hit the trailer...right? */ 1693 mlog_bug_on_msg(ocfs2_skip_dir_trailer(dir, de, offset, size), 1694 "Hit dir trailer trying to insert %.*s " 1695 "(namelen %d) into directory %llu. " 1696 "offset is %lu, trailer offset is %d\n", 1697 namelen, name, namelen, 1698 (unsigned long long)parent_fe_bh->b_blocknr, 1699 offset, ocfs2_dir_trailer_blk_off(dir->i_sb)); 1700 1701 if (ocfs2_dirent_would_fit(de, rec_len)) { 1702 dir->i_mtime = dir->i_ctime = CURRENT_TIME; 1703 retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); 1704 if (retval < 0) { 1705 mlog_errno(retval); 1706 goto bail; 1707 } 1708 1709 if (insert_bh == parent_fe_bh) 1710 status = ocfs2_journal_access_di(handle, 1711 INODE_CACHE(dir), 1712 insert_bh, 1713 OCFS2_JOURNAL_ACCESS_WRITE); 1714 else { 1715 status = ocfs2_journal_access_db(handle, 1716 INODE_CACHE(dir), 1717 insert_bh, 1718 OCFS2_JOURNAL_ACCESS_WRITE); 1719 1720 if (ocfs2_dir_indexed(dir)) { 1721 status = ocfs2_dx_dir_insert(dir, 1722 handle, 1723 lookup); 1724 if (status) { 1725 mlog_errno(status); 1726 goto bail; 1727 } 1728 } 1729 } 1730 1731 /* By now the buffer is marked for journaling */ 1732 offset += le16_to_cpu(de->rec_len); 1733 if (le64_to_cpu(de->inode)) { 1734 de1 = (struct ocfs2_dir_entry *)((char *) de + 1735 OCFS2_DIR_REC_LEN(de->name_len)); 1736 de1->rec_len = 1737 cpu_to_le16(le16_to_cpu(de->rec_len) - 1738 OCFS2_DIR_REC_LEN(de->name_len)); 1739 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); 1740 de = de1; 1741 } 1742 de->file_type = OCFS2_FT_UNKNOWN; 1743 if (blkno) { 1744 de->inode = cpu_to_le64(blkno); 1745 ocfs2_set_de_type(de, inode->i_mode); 1746 } else 1747 de->inode = 0; 1748 de->name_len = namelen; 1749 memcpy(de->name, name, namelen); 1750 1751 if (ocfs2_dir_indexed(dir)) 1752 ocfs2_recalc_free_list(dir, handle, lookup); 1753 1754 dir->i_version++; 1755 ocfs2_journal_dirty(handle, insert_bh); 1756 retval = 0; 1757 goto bail; 1758 } 1759 1760 offset += le16_to_cpu(de->rec_len); 1761 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len)); 1762 } 1763 1764 /* when you think about it, the assert above should prevent us 1765 * from ever getting here. */ 1766 retval = -ENOSPC; 1767 bail: 1768 1769 mlog_exit(retval); 1770 return retval; 1771 } 1772 1773 static int ocfs2_dir_foreach_blk_id(struct inode *inode, 1774 u64 *f_version, 1775 loff_t *f_pos, void *priv, 1776 filldir_t filldir, int *filldir_err) 1777 { 1778 int ret, i, filldir_ret; 1779 unsigned long offset = *f_pos; 1780 struct buffer_head *di_bh = NULL; 1781 struct ocfs2_dinode *di; 1782 struct ocfs2_inline_data *data; 1783 struct ocfs2_dir_entry *de; 1784 1785 ret = ocfs2_read_inode_block(inode, &di_bh); 1786 if (ret) { 1787 mlog(ML_ERROR, "Unable to read inode block for dir %llu\n", 1788 (unsigned long long)OCFS2_I(inode)->ip_blkno); 1789 goto out; 1790 } 1791 1792 di = (struct ocfs2_dinode *)di_bh->b_data; 1793 data = &di->id2.i_data; 1794 1795 while (*f_pos < i_size_read(inode)) { 1796 revalidate: 1797 /* If the dir block has changed since the last call to 1798 * readdir(2), then we might be pointing to an invalid 1799 * dirent right now. Scan from the start of the block 1800 * to make sure. */ 1801 if (*f_version != inode->i_version) { 1802 for (i = 0; i < i_size_read(inode) && i < offset; ) { 1803 de = (struct ocfs2_dir_entry *) 1804 (data->id_data + i); 1805 /* It's too expensive to do a full 1806 * dirent test each time round this 1807 * loop, but we do have to test at 1808 * least that it is non-zero. A 1809 * failure will be detected in the 1810 * dirent test below. */ 1811 if (le16_to_cpu(de->rec_len) < 1812 OCFS2_DIR_REC_LEN(1)) 1813 break; 1814 i += le16_to_cpu(de->rec_len); 1815 } 1816 *f_pos = offset = i; 1817 *f_version = inode->i_version; 1818 } 1819 1820 de = (struct ocfs2_dir_entry *) (data->id_data + *f_pos); 1821 if (!ocfs2_check_dir_entry(inode, de, di_bh, *f_pos)) { 1822 /* On error, skip the f_pos to the end. */ 1823 *f_pos = i_size_read(inode); 1824 goto out; 1825 } 1826 offset += le16_to_cpu(de->rec_len); 1827 if (le64_to_cpu(de->inode)) { 1828 /* We might block in the next section 1829 * if the data destination is 1830 * currently swapped out. So, use a 1831 * version stamp to detect whether or 1832 * not the directory has been modified 1833 * during the copy operation. 1834 */ 1835 u64 version = *f_version; 1836 unsigned char d_type = DT_UNKNOWN; 1837 1838 if (de->file_type < OCFS2_FT_MAX) 1839 d_type = ocfs2_filetype_table[de->file_type]; 1840 1841 filldir_ret = filldir(priv, de->name, 1842 de->name_len, 1843 *f_pos, 1844 le64_to_cpu(de->inode), 1845 d_type); 1846 if (filldir_ret) { 1847 if (filldir_err) 1848 *filldir_err = filldir_ret; 1849 break; 1850 } 1851 if (version != *f_version) 1852 goto revalidate; 1853 } 1854 *f_pos += le16_to_cpu(de->rec_len); 1855 } 1856 1857 out: 1858 brelse(di_bh); 1859 1860 return 0; 1861 } 1862 1863 /* 1864 * NOTE: This function can be called against unindexed directories, 1865 * and indexed ones. 1866 */ 1867 static int ocfs2_dir_foreach_blk_el(struct inode *inode, 1868 u64 *f_version, 1869 loff_t *f_pos, void *priv, 1870 filldir_t filldir, int *filldir_err) 1871 { 1872 int error = 0; 1873 unsigned long offset, blk, last_ra_blk = 0; 1874 int i, stored; 1875 struct buffer_head * bh, * tmp; 1876 struct ocfs2_dir_entry * de; 1877 struct super_block * sb = inode->i_sb; 1878 unsigned int ra_sectors = 16; 1879 1880 stored = 0; 1881 bh = NULL; 1882 1883 offset = (*f_pos) & (sb->s_blocksize - 1); 1884 1885 while (!error && !stored && *f_pos < i_size_read(inode)) { 1886 blk = (*f_pos) >> sb->s_blocksize_bits; 1887 if (ocfs2_read_dir_block(inode, blk, &bh, 0)) { 1888 /* Skip the corrupt dirblock and keep trying */ 1889 *f_pos += sb->s_blocksize - offset; 1890 continue; 1891 } 1892 1893 /* The idea here is to begin with 8k read-ahead and to stay 1894 * 4k ahead of our current position. 1895 * 1896 * TODO: Use the pagecache for this. We just need to 1897 * make sure it's cluster-safe... */ 1898 if (!last_ra_blk 1899 || (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) { 1900 for (i = ra_sectors >> (sb->s_blocksize_bits - 9); 1901 i > 0; i--) { 1902 tmp = NULL; 1903 if (!ocfs2_read_dir_block(inode, ++blk, &tmp, 1904 OCFS2_BH_READAHEAD)) 1905 brelse(tmp); 1906 } 1907 last_ra_blk = blk; 1908 ra_sectors = 8; 1909 } 1910 1911 revalidate: 1912 /* If the dir block has changed since the last call to 1913 * readdir(2), then we might be pointing to an invalid 1914 * dirent right now. Scan from the start of the block 1915 * to make sure. */ 1916 if (*f_version != inode->i_version) { 1917 for (i = 0; i < sb->s_blocksize && i < offset; ) { 1918 de = (struct ocfs2_dir_entry *) (bh->b_data + i); 1919 /* It's too expensive to do a full 1920 * dirent test each time round this 1921 * loop, but we do have to test at 1922 * least that it is non-zero. A 1923 * failure will be detected in the 1924 * dirent test below. */ 1925 if (le16_to_cpu(de->rec_len) < 1926 OCFS2_DIR_REC_LEN(1)) 1927 break; 1928 i += le16_to_cpu(de->rec_len); 1929 } 1930 offset = i; 1931 *f_pos = ((*f_pos) & ~(sb->s_blocksize - 1)) 1932 | offset; 1933 *f_version = inode->i_version; 1934 } 1935 1936 while (!error && *f_pos < i_size_read(inode) 1937 && offset < sb->s_blocksize) { 1938 de = (struct ocfs2_dir_entry *) (bh->b_data + offset); 1939 if (!ocfs2_check_dir_entry(inode, de, bh, offset)) { 1940 /* On error, skip the f_pos to the 1941 next block. */ 1942 *f_pos = ((*f_pos) | (sb->s_blocksize - 1)) + 1; 1943 brelse(bh); 1944 goto out; 1945 } 1946 offset += le16_to_cpu(de->rec_len); 1947 if (le64_to_cpu(de->inode)) { 1948 /* We might block in the next section 1949 * if the data destination is 1950 * currently swapped out. So, use a 1951 * version stamp to detect whether or 1952 * not the directory has been modified 1953 * during the copy operation. 1954 */ 1955 unsigned long version = *f_version; 1956 unsigned char d_type = DT_UNKNOWN; 1957 1958 if (de->file_type < OCFS2_FT_MAX) 1959 d_type = ocfs2_filetype_table[de->file_type]; 1960 error = filldir(priv, de->name, 1961 de->name_len, 1962 *f_pos, 1963 le64_to_cpu(de->inode), 1964 d_type); 1965 if (error) { 1966 if (filldir_err) 1967 *filldir_err = error; 1968 break; 1969 } 1970 if (version != *f_version) 1971 goto revalidate; 1972 stored ++; 1973 } 1974 *f_pos += le16_to_cpu(de->rec_len); 1975 } 1976 offset = 0; 1977 brelse(bh); 1978 bh = NULL; 1979 } 1980 1981 stored = 0; 1982 out: 1983 return stored; 1984 } 1985 1986 static int ocfs2_dir_foreach_blk(struct inode *inode, u64 *f_version, 1987 loff_t *f_pos, void *priv, filldir_t filldir, 1988 int *filldir_err) 1989 { 1990 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) 1991 return ocfs2_dir_foreach_blk_id(inode, f_version, f_pos, priv, 1992 filldir, filldir_err); 1993 1994 return ocfs2_dir_foreach_blk_el(inode, f_version, f_pos, priv, filldir, 1995 filldir_err); 1996 } 1997 1998 /* 1999 * This is intended to be called from inside other kernel functions, 2000 * so we fake some arguments. 2001 */ 2002 int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv, 2003 filldir_t filldir) 2004 { 2005 int ret = 0, filldir_err = 0; 2006 u64 version = inode->i_version; 2007 2008 while (*f_pos < i_size_read(inode)) { 2009 ret = ocfs2_dir_foreach_blk(inode, &version, f_pos, priv, 2010 filldir, &filldir_err); 2011 if (ret || filldir_err) 2012 break; 2013 } 2014 2015 if (ret > 0) 2016 ret = -EIO; 2017 2018 return 0; 2019 } 2020 2021 /* 2022 * ocfs2_readdir() 2023 * 2024 */ 2025 int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir) 2026 { 2027 int error = 0; 2028 struct inode *inode = filp->f_path.dentry->d_inode; 2029 int lock_level = 0; 2030 2031 mlog_entry("dirino=%llu\n", 2032 (unsigned long long)OCFS2_I(inode)->ip_blkno); 2033 2034 error = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level); 2035 if (lock_level && error >= 0) { 2036 /* We release EX lock which used to update atime 2037 * and get PR lock again to reduce contention 2038 * on commonly accessed directories. */ 2039 ocfs2_inode_unlock(inode, 1); 2040 lock_level = 0; 2041 error = ocfs2_inode_lock(inode, NULL, 0); 2042 } 2043 if (error < 0) { 2044 if (error != -ENOENT) 2045 mlog_errno(error); 2046 /* we haven't got any yet, so propagate the error. */ 2047 goto bail_nolock; 2048 } 2049 2050 error = ocfs2_dir_foreach_blk(inode, &filp->f_version, &filp->f_pos, 2051 dirent, filldir, NULL); 2052 2053 ocfs2_inode_unlock(inode, lock_level); 2054 2055 bail_nolock: 2056 mlog_exit(error); 2057 2058 return error; 2059 } 2060 2061 /* 2062 * NOTE: this should always be called with parent dir i_mutex taken. 2063 */ 2064 int ocfs2_find_files_on_disk(const char *name, 2065 int namelen, 2066 u64 *blkno, 2067 struct inode *inode, 2068 struct ocfs2_dir_lookup_result *lookup) 2069 { 2070 int status = -ENOENT; 2071 2072 mlog(0, "name=%.*s, blkno=%p, inode=%llu\n", namelen, name, blkno, 2073 (unsigned long long)OCFS2_I(inode)->ip_blkno); 2074 2075 status = ocfs2_find_entry(name, namelen, inode, lookup); 2076 if (status) 2077 goto leave; 2078 2079 *blkno = le64_to_cpu(lookup->dl_entry->inode); 2080 2081 status = 0; 2082 leave: 2083 2084 return status; 2085 } 2086 2087 /* 2088 * Convenience function for callers which just want the block number 2089 * mapped to a name and don't require the full dirent info, etc. 2090 */ 2091 int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name, 2092 int namelen, u64 *blkno) 2093 { 2094 int ret; 2095 struct ocfs2_dir_lookup_result lookup = { NULL, }; 2096 2097 ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &lookup); 2098 ocfs2_free_dir_lookup_result(&lookup); 2099 2100 return ret; 2101 } 2102 2103 /* Check for a name within a directory. 2104 * 2105 * Return 0 if the name does not exist 2106 * Return -EEXIST if the directory contains the name 2107 * 2108 * Callers should have i_mutex + a cluster lock on dir 2109 */ 2110 int ocfs2_check_dir_for_entry(struct inode *dir, 2111 const char *name, 2112 int namelen) 2113 { 2114 int ret; 2115 struct ocfs2_dir_lookup_result lookup = { NULL, }; 2116 2117 mlog_entry("dir %llu, name '%.*s'\n", 2118 (unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name); 2119 2120 ret = -EEXIST; 2121 if (ocfs2_find_entry(name, namelen, dir, &lookup) == 0) 2122 goto bail; 2123 2124 ret = 0; 2125 bail: 2126 ocfs2_free_dir_lookup_result(&lookup); 2127 2128 mlog_exit(ret); 2129 return ret; 2130 } 2131 2132 struct ocfs2_empty_dir_priv { 2133 unsigned seen_dot; 2134 unsigned seen_dot_dot; 2135 unsigned seen_other; 2136 unsigned dx_dir; 2137 }; 2138 static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len, 2139 loff_t pos, u64 ino, unsigned type) 2140 { 2141 struct ocfs2_empty_dir_priv *p = priv; 2142 2143 /* 2144 * Check the positions of "." and ".." records to be sure 2145 * they're in the correct place. 2146 * 2147 * Indexed directories don't need to proceed past the first 2148 * two entries, so we end the scan after seeing '..'. Despite 2149 * that, we allow the scan to proceed In the event that we 2150 * have a corrupted indexed directory (no dot or dot dot 2151 * entries). This allows us to double check for existing 2152 * entries which might not have been found in the index. 2153 */ 2154 if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) { 2155 p->seen_dot = 1; 2156 return 0; 2157 } 2158 2159 if (name_len == 2 && !strncmp("..", name, 2) && 2160 pos == OCFS2_DIR_REC_LEN(1)) { 2161 p->seen_dot_dot = 1; 2162 2163 if (p->dx_dir && p->seen_dot) 2164 return 1; 2165 2166 return 0; 2167 } 2168 2169 p->seen_other = 1; 2170 return 1; 2171 } 2172 2173 static int ocfs2_empty_dir_dx(struct inode *inode, 2174 struct ocfs2_empty_dir_priv *priv) 2175 { 2176 int ret; 2177 struct buffer_head *di_bh = NULL; 2178 struct buffer_head *dx_root_bh = NULL; 2179 struct ocfs2_dinode *di; 2180 struct ocfs2_dx_root_block *dx_root; 2181 2182 priv->dx_dir = 1; 2183 2184 ret = ocfs2_read_inode_block(inode, &di_bh); 2185 if (ret) { 2186 mlog_errno(ret); 2187 goto out; 2188 } 2189 di = (struct ocfs2_dinode *)di_bh->b_data; 2190 2191 ret = ocfs2_read_dx_root(inode, di, &dx_root_bh); 2192 if (ret) { 2193 mlog_errno(ret); 2194 goto out; 2195 } 2196 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 2197 2198 if (le32_to_cpu(dx_root->dr_num_entries) != 2) 2199 priv->seen_other = 1; 2200 2201 out: 2202 brelse(di_bh); 2203 brelse(dx_root_bh); 2204 return ret; 2205 } 2206 2207 /* 2208 * routine to check that the specified directory is empty (for rmdir) 2209 * 2210 * Returns 1 if dir is empty, zero otherwise. 2211 * 2212 * XXX: This is a performance problem for unindexed directories. 2213 */ 2214 int ocfs2_empty_dir(struct inode *inode) 2215 { 2216 int ret; 2217 loff_t start = 0; 2218 struct ocfs2_empty_dir_priv priv; 2219 2220 memset(&priv, 0, sizeof(priv)); 2221 2222 if (ocfs2_dir_indexed(inode)) { 2223 ret = ocfs2_empty_dir_dx(inode, &priv); 2224 if (ret) 2225 mlog_errno(ret); 2226 /* 2227 * We still run ocfs2_dir_foreach to get the checks 2228 * for "." and "..". 2229 */ 2230 } 2231 2232 ret = ocfs2_dir_foreach(inode, &start, &priv, ocfs2_empty_dir_filldir); 2233 if (ret) 2234 mlog_errno(ret); 2235 2236 if (!priv.seen_dot || !priv.seen_dot_dot) { 2237 mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n", 2238 (unsigned long long)OCFS2_I(inode)->ip_blkno); 2239 /* 2240 * XXX: Is it really safe to allow an unlink to continue? 2241 */ 2242 return 1; 2243 } 2244 2245 return !priv.seen_other; 2246 } 2247 2248 /* 2249 * Fills "." and ".." dirents in a new directory block. Returns dirent for 2250 * "..", which might be used during creation of a directory with a trailing 2251 * header. It is otherwise safe to ignore the return code. 2252 */ 2253 static struct ocfs2_dir_entry *ocfs2_fill_initial_dirents(struct inode *inode, 2254 struct inode *parent, 2255 char *start, 2256 unsigned int size) 2257 { 2258 struct ocfs2_dir_entry *de = (struct ocfs2_dir_entry *)start; 2259 2260 de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno); 2261 de->name_len = 1; 2262 de->rec_len = 2263 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); 2264 strcpy(de->name, "."); 2265 ocfs2_set_de_type(de, S_IFDIR); 2266 2267 de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len)); 2268 de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno); 2269 de->rec_len = cpu_to_le16(size - OCFS2_DIR_REC_LEN(1)); 2270 de->name_len = 2; 2271 strcpy(de->name, ".."); 2272 ocfs2_set_de_type(de, S_IFDIR); 2273 2274 return de; 2275 } 2276 2277 /* 2278 * This works together with code in ocfs2_mknod_locked() which sets 2279 * the inline-data flag and initializes the inline-data section. 2280 */ 2281 static int ocfs2_fill_new_dir_id(struct ocfs2_super *osb, 2282 handle_t *handle, 2283 struct inode *parent, 2284 struct inode *inode, 2285 struct buffer_head *di_bh) 2286 { 2287 int ret; 2288 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 2289 struct ocfs2_inline_data *data = &di->id2.i_data; 2290 unsigned int size = le16_to_cpu(data->id_count); 2291 2292 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, 2293 OCFS2_JOURNAL_ACCESS_WRITE); 2294 if (ret) { 2295 mlog_errno(ret); 2296 goto out; 2297 } 2298 2299 ocfs2_fill_initial_dirents(inode, parent, data->id_data, size); 2300 ocfs2_journal_dirty(handle, di_bh); 2301 2302 i_size_write(inode, size); 2303 inode->i_nlink = 2; 2304 inode->i_blocks = ocfs2_inode_sector_count(inode); 2305 2306 ret = ocfs2_mark_inode_dirty(handle, inode, di_bh); 2307 if (ret < 0) 2308 mlog_errno(ret); 2309 2310 out: 2311 return ret; 2312 } 2313 2314 static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb, 2315 handle_t *handle, 2316 struct inode *parent, 2317 struct inode *inode, 2318 struct buffer_head *fe_bh, 2319 struct ocfs2_alloc_context *data_ac, 2320 struct buffer_head **ret_new_bh) 2321 { 2322 int status; 2323 unsigned int size = osb->sb->s_blocksize; 2324 struct buffer_head *new_bh = NULL; 2325 struct ocfs2_dir_entry *de; 2326 2327 mlog_entry_void(); 2328 2329 if (ocfs2_new_dir_wants_trailer(inode)) 2330 size = ocfs2_dir_trailer_blk_off(parent->i_sb); 2331 2332 status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh, 2333 data_ac, NULL, &new_bh); 2334 if (status < 0) { 2335 mlog_errno(status); 2336 goto bail; 2337 } 2338 2339 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh); 2340 2341 status = ocfs2_journal_access_db(handle, INODE_CACHE(inode), new_bh, 2342 OCFS2_JOURNAL_ACCESS_CREATE); 2343 if (status < 0) { 2344 mlog_errno(status); 2345 goto bail; 2346 } 2347 memset(new_bh->b_data, 0, osb->sb->s_blocksize); 2348 2349 de = ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data, size); 2350 if (ocfs2_new_dir_wants_trailer(inode)) { 2351 int size = le16_to_cpu(de->rec_len); 2352 2353 /* 2354 * Figure out the size of the hole left over after 2355 * insertion of '.' and '..'. The trailer wants this 2356 * information. 2357 */ 2358 size -= OCFS2_DIR_REC_LEN(2); 2359 size -= sizeof(struct ocfs2_dir_block_trailer); 2360 2361 ocfs2_init_dir_trailer(inode, new_bh, size); 2362 } 2363 2364 ocfs2_journal_dirty(handle, new_bh); 2365 2366 i_size_write(inode, inode->i_sb->s_blocksize); 2367 inode->i_nlink = 2; 2368 inode->i_blocks = ocfs2_inode_sector_count(inode); 2369 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); 2370 if (status < 0) { 2371 mlog_errno(status); 2372 goto bail; 2373 } 2374 2375 status = 0; 2376 if (ret_new_bh) { 2377 *ret_new_bh = new_bh; 2378 new_bh = NULL; 2379 } 2380 bail: 2381 brelse(new_bh); 2382 2383 mlog_exit(status); 2384 return status; 2385 } 2386 2387 static int ocfs2_dx_dir_attach_index(struct ocfs2_super *osb, 2388 handle_t *handle, struct inode *dir, 2389 struct buffer_head *di_bh, 2390 struct buffer_head *dirdata_bh, 2391 struct ocfs2_alloc_context *meta_ac, 2392 int dx_inline, u32 num_entries, 2393 struct buffer_head **ret_dx_root_bh) 2394 { 2395 int ret; 2396 struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data; 2397 u16 dr_suballoc_bit; 2398 u64 suballoc_loc, dr_blkno; 2399 unsigned int num_bits; 2400 struct buffer_head *dx_root_bh = NULL; 2401 struct ocfs2_dx_root_block *dx_root; 2402 struct ocfs2_dir_block_trailer *trailer = 2403 ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb); 2404 2405 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc, 2406 &dr_suballoc_bit, &num_bits, &dr_blkno); 2407 if (ret) { 2408 mlog_errno(ret); 2409 goto out; 2410 } 2411 2412 mlog(0, "Dir %llu, attach new index block: %llu\n", 2413 (unsigned long long)OCFS2_I(dir)->ip_blkno, 2414 (unsigned long long)dr_blkno); 2415 2416 dx_root_bh = sb_getblk(osb->sb, dr_blkno); 2417 if (dx_root_bh == NULL) { 2418 ret = -EIO; 2419 goto out; 2420 } 2421 ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dx_root_bh); 2422 2423 ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh, 2424 OCFS2_JOURNAL_ACCESS_CREATE); 2425 if (ret < 0) { 2426 mlog_errno(ret); 2427 goto out; 2428 } 2429 2430 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 2431 memset(dx_root, 0, osb->sb->s_blocksize); 2432 strcpy(dx_root->dr_signature, OCFS2_DX_ROOT_SIGNATURE); 2433 dx_root->dr_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot); 2434 dx_root->dr_suballoc_loc = cpu_to_le64(suballoc_loc); 2435 dx_root->dr_suballoc_bit = cpu_to_le16(dr_suballoc_bit); 2436 dx_root->dr_fs_generation = cpu_to_le32(osb->fs_generation); 2437 dx_root->dr_blkno = cpu_to_le64(dr_blkno); 2438 dx_root->dr_dir_blkno = cpu_to_le64(OCFS2_I(dir)->ip_blkno); 2439 dx_root->dr_num_entries = cpu_to_le32(num_entries); 2440 if (le16_to_cpu(trailer->db_free_rec_len)) 2441 dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr); 2442 else 2443 dx_root->dr_free_blk = cpu_to_le64(0); 2444 2445 if (dx_inline) { 2446 dx_root->dr_flags |= OCFS2_DX_FLAG_INLINE; 2447 dx_root->dr_entries.de_count = 2448 cpu_to_le16(ocfs2_dx_entries_per_root(osb->sb)); 2449 } else { 2450 dx_root->dr_list.l_count = 2451 cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb)); 2452 } 2453 ocfs2_journal_dirty(handle, dx_root_bh); 2454 2455 ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh, 2456 OCFS2_JOURNAL_ACCESS_CREATE); 2457 if (ret) { 2458 mlog_errno(ret); 2459 goto out; 2460 } 2461 2462 di->i_dx_root = cpu_to_le64(dr_blkno); 2463 2464 spin_lock(&OCFS2_I(dir)->ip_lock); 2465 OCFS2_I(dir)->ip_dyn_features |= OCFS2_INDEXED_DIR_FL; 2466 di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features); 2467 spin_unlock(&OCFS2_I(dir)->ip_lock); 2468 2469 ocfs2_journal_dirty(handle, di_bh); 2470 2471 *ret_dx_root_bh = dx_root_bh; 2472 dx_root_bh = NULL; 2473 2474 out: 2475 brelse(dx_root_bh); 2476 return ret; 2477 } 2478 2479 static int ocfs2_dx_dir_format_cluster(struct ocfs2_super *osb, 2480 handle_t *handle, struct inode *dir, 2481 struct buffer_head **dx_leaves, 2482 int num_dx_leaves, u64 start_blk) 2483 { 2484 int ret, i; 2485 struct ocfs2_dx_leaf *dx_leaf; 2486 struct buffer_head *bh; 2487 2488 for (i = 0; i < num_dx_leaves; i++) { 2489 bh = sb_getblk(osb->sb, start_blk + i); 2490 if (bh == NULL) { 2491 ret = -EIO; 2492 goto out; 2493 } 2494 dx_leaves[i] = bh; 2495 2496 ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), bh); 2497 2498 ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), bh, 2499 OCFS2_JOURNAL_ACCESS_CREATE); 2500 if (ret < 0) { 2501 mlog_errno(ret); 2502 goto out; 2503 } 2504 2505 dx_leaf = (struct ocfs2_dx_leaf *) bh->b_data; 2506 2507 memset(dx_leaf, 0, osb->sb->s_blocksize); 2508 strcpy(dx_leaf->dl_signature, OCFS2_DX_LEAF_SIGNATURE); 2509 dx_leaf->dl_fs_generation = cpu_to_le32(osb->fs_generation); 2510 dx_leaf->dl_blkno = cpu_to_le64(bh->b_blocknr); 2511 dx_leaf->dl_list.de_count = 2512 cpu_to_le16(ocfs2_dx_entries_per_leaf(osb->sb)); 2513 2514 mlog(0, 2515 "Dir %llu, format dx_leaf: %llu, entry count: %u\n", 2516 (unsigned long long)OCFS2_I(dir)->ip_blkno, 2517 (unsigned long long)bh->b_blocknr, 2518 le16_to_cpu(dx_leaf->dl_list.de_count)); 2519 2520 ocfs2_journal_dirty(handle, bh); 2521 } 2522 2523 ret = 0; 2524 out: 2525 return ret; 2526 } 2527 2528 /* 2529 * Allocates and formats a new cluster for use in an indexed dir 2530 * leaf. This version will not do the extent insert, so that it can be 2531 * used by operations which need careful ordering. 2532 */ 2533 static int __ocfs2_dx_dir_new_cluster(struct inode *dir, 2534 u32 cpos, handle_t *handle, 2535 struct ocfs2_alloc_context *data_ac, 2536 struct buffer_head **dx_leaves, 2537 int num_dx_leaves, u64 *ret_phys_blkno) 2538 { 2539 int ret; 2540 u32 phys, num; 2541 u64 phys_blkno; 2542 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 2543 2544 /* 2545 * XXX: For create, this should claim cluster for the index 2546 * *before* the unindexed insert so that we have a better 2547 * chance of contiguousness as the directory grows in number 2548 * of entries. 2549 */ 2550 ret = __ocfs2_claim_clusters(handle, data_ac, 1, 1, &phys, &num); 2551 if (ret) { 2552 mlog_errno(ret); 2553 goto out; 2554 } 2555 2556 /* 2557 * Format the new cluster first. That way, we're inserting 2558 * valid data. 2559 */ 2560 phys_blkno = ocfs2_clusters_to_blocks(osb->sb, phys); 2561 ret = ocfs2_dx_dir_format_cluster(osb, handle, dir, dx_leaves, 2562 num_dx_leaves, phys_blkno); 2563 if (ret) { 2564 mlog_errno(ret); 2565 goto out; 2566 } 2567 2568 *ret_phys_blkno = phys_blkno; 2569 out: 2570 return ret; 2571 } 2572 2573 static int ocfs2_dx_dir_new_cluster(struct inode *dir, 2574 struct ocfs2_extent_tree *et, 2575 u32 cpos, handle_t *handle, 2576 struct ocfs2_alloc_context *data_ac, 2577 struct ocfs2_alloc_context *meta_ac, 2578 struct buffer_head **dx_leaves, 2579 int num_dx_leaves) 2580 { 2581 int ret; 2582 u64 phys_blkno; 2583 2584 ret = __ocfs2_dx_dir_new_cluster(dir, cpos, handle, data_ac, dx_leaves, 2585 num_dx_leaves, &phys_blkno); 2586 if (ret) { 2587 mlog_errno(ret); 2588 goto out; 2589 } 2590 2591 ret = ocfs2_insert_extent(handle, et, cpos, phys_blkno, 1, 0, 2592 meta_ac); 2593 if (ret) 2594 mlog_errno(ret); 2595 out: 2596 return ret; 2597 } 2598 2599 static struct buffer_head **ocfs2_dx_dir_kmalloc_leaves(struct super_block *sb, 2600 int *ret_num_leaves) 2601 { 2602 int num_dx_leaves = ocfs2_clusters_to_blocks(sb, 1); 2603 struct buffer_head **dx_leaves; 2604 2605 dx_leaves = kcalloc(num_dx_leaves, sizeof(struct buffer_head *), 2606 GFP_NOFS); 2607 if (dx_leaves && ret_num_leaves) 2608 *ret_num_leaves = num_dx_leaves; 2609 2610 return dx_leaves; 2611 } 2612 2613 static int ocfs2_fill_new_dir_dx(struct ocfs2_super *osb, 2614 handle_t *handle, 2615 struct inode *parent, 2616 struct inode *inode, 2617 struct buffer_head *di_bh, 2618 struct ocfs2_alloc_context *data_ac, 2619 struct ocfs2_alloc_context *meta_ac) 2620 { 2621 int ret; 2622 struct buffer_head *leaf_bh = NULL; 2623 struct buffer_head *dx_root_bh = NULL; 2624 struct ocfs2_dx_hinfo hinfo; 2625 struct ocfs2_dx_root_block *dx_root; 2626 struct ocfs2_dx_entry_list *entry_list; 2627 2628 /* 2629 * Our strategy is to create the directory as though it were 2630 * unindexed, then add the index block. This works with very 2631 * little complication since the state of a new directory is a 2632 * very well known quantity. 2633 * 2634 * Essentially, we have two dirents ("." and ".."), in the 1st 2635 * block which need indexing. These are easily inserted into 2636 * the index block. 2637 */ 2638 2639 ret = ocfs2_fill_new_dir_el(osb, handle, parent, inode, di_bh, 2640 data_ac, &leaf_bh); 2641 if (ret) { 2642 mlog_errno(ret); 2643 goto out; 2644 } 2645 2646 ret = ocfs2_dx_dir_attach_index(osb, handle, inode, di_bh, leaf_bh, 2647 meta_ac, 1, 2, &dx_root_bh); 2648 if (ret) { 2649 mlog_errno(ret); 2650 goto out; 2651 } 2652 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 2653 entry_list = &dx_root->dr_entries; 2654 2655 /* Buffer has been journaled for us by ocfs2_dx_dir_attach_index */ 2656 ocfs2_dx_dir_name_hash(inode, ".", 1, &hinfo); 2657 ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr); 2658 2659 ocfs2_dx_dir_name_hash(inode, "..", 2, &hinfo); 2660 ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr); 2661 2662 out: 2663 brelse(dx_root_bh); 2664 brelse(leaf_bh); 2665 return ret; 2666 } 2667 2668 int ocfs2_fill_new_dir(struct ocfs2_super *osb, 2669 handle_t *handle, 2670 struct inode *parent, 2671 struct inode *inode, 2672 struct buffer_head *fe_bh, 2673 struct ocfs2_alloc_context *data_ac, 2674 struct ocfs2_alloc_context *meta_ac) 2675 2676 { 2677 BUG_ON(!ocfs2_supports_inline_data(osb) && data_ac == NULL); 2678 2679 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) 2680 return ocfs2_fill_new_dir_id(osb, handle, parent, inode, fe_bh); 2681 2682 if (ocfs2_supports_indexed_dirs(osb)) 2683 return ocfs2_fill_new_dir_dx(osb, handle, parent, inode, fe_bh, 2684 data_ac, meta_ac); 2685 2686 return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh, 2687 data_ac, NULL); 2688 } 2689 2690 static int ocfs2_dx_dir_index_block(struct inode *dir, 2691 handle_t *handle, 2692 struct buffer_head **dx_leaves, 2693 int num_dx_leaves, 2694 u32 *num_dx_entries, 2695 struct buffer_head *dirent_bh) 2696 { 2697 int ret = 0, namelen, i; 2698 char *de_buf, *limit; 2699 struct ocfs2_dir_entry *de; 2700 struct buffer_head *dx_leaf_bh; 2701 struct ocfs2_dx_hinfo hinfo; 2702 u64 dirent_blk = dirent_bh->b_blocknr; 2703 2704 de_buf = dirent_bh->b_data; 2705 limit = de_buf + dir->i_sb->s_blocksize; 2706 2707 while (de_buf < limit) { 2708 de = (struct ocfs2_dir_entry *)de_buf; 2709 2710 namelen = de->name_len; 2711 if (!namelen || !de->inode) 2712 goto inc; 2713 2714 ocfs2_dx_dir_name_hash(dir, de->name, namelen, &hinfo); 2715 2716 i = ocfs2_dx_dir_hash_idx(OCFS2_SB(dir->i_sb), &hinfo); 2717 dx_leaf_bh = dx_leaves[i]; 2718 2719 ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &hinfo, 2720 dirent_blk, dx_leaf_bh); 2721 if (ret) { 2722 mlog_errno(ret); 2723 goto out; 2724 } 2725 2726 *num_dx_entries = *num_dx_entries + 1; 2727 2728 inc: 2729 de_buf += le16_to_cpu(de->rec_len); 2730 } 2731 2732 out: 2733 return ret; 2734 } 2735 2736 /* 2737 * XXX: This expects dx_root_bh to already be part of the transaction. 2738 */ 2739 static void ocfs2_dx_dir_index_root_block(struct inode *dir, 2740 struct buffer_head *dx_root_bh, 2741 struct buffer_head *dirent_bh) 2742 { 2743 char *de_buf, *limit; 2744 struct ocfs2_dx_root_block *dx_root; 2745 struct ocfs2_dir_entry *de; 2746 struct ocfs2_dx_hinfo hinfo; 2747 u64 dirent_blk = dirent_bh->b_blocknr; 2748 2749 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 2750 2751 de_buf = dirent_bh->b_data; 2752 limit = de_buf + dir->i_sb->s_blocksize; 2753 2754 while (de_buf < limit) { 2755 de = (struct ocfs2_dir_entry *)de_buf; 2756 2757 if (!de->name_len || !de->inode) 2758 goto inc; 2759 2760 ocfs2_dx_dir_name_hash(dir, de->name, de->name_len, &hinfo); 2761 2762 mlog(0, 2763 "dir: %llu, major: 0x%x minor: 0x%x, index: %u, name: %.*s\n", 2764 (unsigned long long)dir->i_ino, hinfo.major_hash, 2765 hinfo.minor_hash, 2766 le16_to_cpu(dx_root->dr_entries.de_num_used), 2767 de->name_len, de->name); 2768 2769 ocfs2_dx_entry_list_insert(&dx_root->dr_entries, &hinfo, 2770 dirent_blk); 2771 2772 le32_add_cpu(&dx_root->dr_num_entries, 1); 2773 inc: 2774 de_buf += le16_to_cpu(de->rec_len); 2775 } 2776 } 2777 2778 /* 2779 * Count the number of inline directory entries in di_bh and compare 2780 * them against the number of entries we can hold in an inline dx root 2781 * block. 2782 */ 2783 static int ocfs2_new_dx_should_be_inline(struct inode *dir, 2784 struct buffer_head *di_bh) 2785 { 2786 int dirent_count = 0; 2787 char *de_buf, *limit; 2788 struct ocfs2_dir_entry *de; 2789 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 2790 2791 de_buf = di->id2.i_data.id_data; 2792 limit = de_buf + i_size_read(dir); 2793 2794 while (de_buf < limit) { 2795 de = (struct ocfs2_dir_entry *)de_buf; 2796 2797 if (de->name_len && de->inode) 2798 dirent_count++; 2799 2800 de_buf += le16_to_cpu(de->rec_len); 2801 } 2802 2803 /* We are careful to leave room for one extra record. */ 2804 return dirent_count < ocfs2_dx_entries_per_root(dir->i_sb); 2805 } 2806 2807 /* 2808 * Expand rec_len of the rightmost dirent in a directory block so that it 2809 * contains the end of our valid space for dirents. We do this during 2810 * expansion from an inline directory to one with extents. The first dir block 2811 * in that case is taken from the inline data portion of the inode block. 2812 * 2813 * This will also return the largest amount of contiguous space for a dirent 2814 * in the block. That value is *not* necessarily the last dirent, even after 2815 * expansion. The directory indexing code wants this value for free space 2816 * accounting. We do this here since we're already walking the entire dir 2817 * block. 2818 * 2819 * We add the dir trailer if this filesystem wants it. 2820 */ 2821 static unsigned int ocfs2_expand_last_dirent(char *start, unsigned int old_size, 2822 struct inode *dir) 2823 { 2824 struct super_block *sb = dir->i_sb; 2825 struct ocfs2_dir_entry *de; 2826 struct ocfs2_dir_entry *prev_de; 2827 char *de_buf, *limit; 2828 unsigned int new_size = sb->s_blocksize; 2829 unsigned int bytes, this_hole; 2830 unsigned int largest_hole = 0; 2831 2832 if (ocfs2_new_dir_wants_trailer(dir)) 2833 new_size = ocfs2_dir_trailer_blk_off(sb); 2834 2835 bytes = new_size - old_size; 2836 2837 limit = start + old_size; 2838 de_buf = start; 2839 de = (struct ocfs2_dir_entry *)de_buf; 2840 do { 2841 this_hole = ocfs2_figure_dirent_hole(de); 2842 if (this_hole > largest_hole) 2843 largest_hole = this_hole; 2844 2845 prev_de = de; 2846 de_buf += le16_to_cpu(de->rec_len); 2847 de = (struct ocfs2_dir_entry *)de_buf; 2848 } while (de_buf < limit); 2849 2850 le16_add_cpu(&prev_de->rec_len, bytes); 2851 2852 /* We need to double check this after modification of the final 2853 * dirent. */ 2854 this_hole = ocfs2_figure_dirent_hole(prev_de); 2855 if (this_hole > largest_hole) 2856 largest_hole = this_hole; 2857 2858 if (largest_hole >= OCFS2_DIR_MIN_REC_LEN) 2859 return largest_hole; 2860 return 0; 2861 } 2862 2863 /* 2864 * We allocate enough clusters to fulfill "blocks_wanted", but set 2865 * i_size to exactly one block. Ocfs2_extend_dir() will handle the 2866 * rest automatically for us. 2867 * 2868 * *first_block_bh is a pointer to the 1st data block allocated to the 2869 * directory. 2870 */ 2871 static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh, 2872 unsigned int blocks_wanted, 2873 struct ocfs2_dir_lookup_result *lookup, 2874 struct buffer_head **first_block_bh) 2875 { 2876 u32 alloc, dx_alloc, bit_off, len, num_dx_entries = 0; 2877 struct super_block *sb = dir->i_sb; 2878 int ret, i, num_dx_leaves = 0, dx_inline = 0, 2879 credits = ocfs2_inline_to_extents_credits(sb); 2880 u64 dx_insert_blkno, blkno, 2881 bytes = blocks_wanted << sb->s_blocksize_bits; 2882 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 2883 struct ocfs2_inode_info *oi = OCFS2_I(dir); 2884 struct ocfs2_alloc_context *data_ac; 2885 struct ocfs2_alloc_context *meta_ac = NULL; 2886 struct buffer_head *dirdata_bh = NULL; 2887 struct buffer_head *dx_root_bh = NULL; 2888 struct buffer_head **dx_leaves = NULL; 2889 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 2890 handle_t *handle; 2891 struct ocfs2_extent_tree et; 2892 struct ocfs2_extent_tree dx_et; 2893 int did_quota = 0, bytes_allocated = 0; 2894 2895 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(dir), di_bh); 2896 2897 alloc = ocfs2_clusters_for_bytes(sb, bytes); 2898 dx_alloc = 0; 2899 2900 down_write(&oi->ip_alloc_sem); 2901 2902 if (ocfs2_supports_indexed_dirs(osb)) { 2903 credits += ocfs2_add_dir_index_credits(sb); 2904 2905 dx_inline = ocfs2_new_dx_should_be_inline(dir, di_bh); 2906 if (!dx_inline) { 2907 /* Add one more cluster for an index leaf */ 2908 dx_alloc++; 2909 dx_leaves = ocfs2_dx_dir_kmalloc_leaves(sb, 2910 &num_dx_leaves); 2911 if (!dx_leaves) { 2912 ret = -ENOMEM; 2913 mlog_errno(ret); 2914 goto out; 2915 } 2916 } 2917 2918 /* This gets us the dx_root */ 2919 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); 2920 if (ret) { 2921 mlog_errno(ret); 2922 goto out; 2923 } 2924 } 2925 2926 /* 2927 * We should never need more than 2 clusters for the unindexed 2928 * tree - maximum dirent size is far less than one block. In 2929 * fact, the only time we'd need more than one cluster is if 2930 * blocksize == clustersize and the dirent won't fit in the 2931 * extra space that the expansion to a single block gives. As 2932 * of today, that only happens on 4k/4k file systems. 2933 */ 2934 BUG_ON(alloc > 2); 2935 2936 ret = ocfs2_reserve_clusters(osb, alloc + dx_alloc, &data_ac); 2937 if (ret) { 2938 mlog_errno(ret); 2939 goto out; 2940 } 2941 2942 /* 2943 * Prepare for worst case allocation scenario of two separate 2944 * extents in the unindexed tree. 2945 */ 2946 if (alloc == 2) 2947 credits += OCFS2_SUBALLOC_ALLOC; 2948 2949 handle = ocfs2_start_trans(osb, credits); 2950 if (IS_ERR(handle)) { 2951 ret = PTR_ERR(handle); 2952 mlog_errno(ret); 2953 goto out; 2954 } 2955 2956 ret = dquot_alloc_space_nodirty(dir, 2957 ocfs2_clusters_to_bytes(osb->sb, alloc + dx_alloc)); 2958 if (ret) 2959 goto out_commit; 2960 did_quota = 1; 2961 2962 if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) { 2963 /* 2964 * Allocate our index cluster first, to maximize the 2965 * possibility that unindexed leaves grow 2966 * contiguously. 2967 */ 2968 ret = __ocfs2_dx_dir_new_cluster(dir, 0, handle, data_ac, 2969 dx_leaves, num_dx_leaves, 2970 &dx_insert_blkno); 2971 if (ret) { 2972 mlog_errno(ret); 2973 goto out_commit; 2974 } 2975 bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1); 2976 } 2977 2978 /* 2979 * Try to claim as many clusters as the bitmap can give though 2980 * if we only get one now, that's enough to continue. The rest 2981 * will be claimed after the conversion to extents. 2982 */ 2983 if (ocfs2_dir_resv_allowed(osb)) 2984 data_ac->ac_resv = &oi->ip_la_data_resv; 2985 ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off, &len); 2986 if (ret) { 2987 mlog_errno(ret); 2988 goto out_commit; 2989 } 2990 bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1); 2991 2992 /* 2993 * Operations are carefully ordered so that we set up the new 2994 * data block first. The conversion from inline data to 2995 * extents follows. 2996 */ 2997 blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off); 2998 dirdata_bh = sb_getblk(sb, blkno); 2999 if (!dirdata_bh) { 3000 ret = -EIO; 3001 mlog_errno(ret); 3002 goto out_commit; 3003 } 3004 3005 ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dirdata_bh); 3006 3007 ret = ocfs2_journal_access_db(handle, INODE_CACHE(dir), dirdata_bh, 3008 OCFS2_JOURNAL_ACCESS_CREATE); 3009 if (ret) { 3010 mlog_errno(ret); 3011 goto out_commit; 3012 } 3013 3014 memcpy(dirdata_bh->b_data, di->id2.i_data.id_data, i_size_read(dir)); 3015 memset(dirdata_bh->b_data + i_size_read(dir), 0, 3016 sb->s_blocksize - i_size_read(dir)); 3017 i = ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir), dir); 3018 if (ocfs2_new_dir_wants_trailer(dir)) { 3019 /* 3020 * Prepare the dir trailer up front. It will otherwise look 3021 * like a valid dirent. Even if inserting the index fails 3022 * (unlikely), then all we'll have done is given first dir 3023 * block a small amount of fragmentation. 3024 */ 3025 ocfs2_init_dir_trailer(dir, dirdata_bh, i); 3026 } 3027 3028 ocfs2_journal_dirty(handle, dirdata_bh); 3029 3030 if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) { 3031 /* 3032 * Dx dirs with an external cluster need to do this up 3033 * front. Inline dx root's get handled later, after 3034 * we've allocated our root block. We get passed back 3035 * a total number of items so that dr_num_entries can 3036 * be correctly set once the dx_root has been 3037 * allocated. 3038 */ 3039 ret = ocfs2_dx_dir_index_block(dir, handle, dx_leaves, 3040 num_dx_leaves, &num_dx_entries, 3041 dirdata_bh); 3042 if (ret) { 3043 mlog_errno(ret); 3044 goto out_commit; 3045 } 3046 } 3047 3048 /* 3049 * Set extent, i_size, etc on the directory. After this, the 3050 * inode should contain the same exact dirents as before and 3051 * be fully accessible from system calls. 3052 * 3053 * We let the later dirent insert modify c/mtime - to the user 3054 * the data hasn't changed. 3055 */ 3056 ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh, 3057 OCFS2_JOURNAL_ACCESS_CREATE); 3058 if (ret) { 3059 mlog_errno(ret); 3060 goto out_commit; 3061 } 3062 3063 spin_lock(&oi->ip_lock); 3064 oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL; 3065 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 3066 spin_unlock(&oi->ip_lock); 3067 3068 ocfs2_dinode_new_extent_list(dir, di); 3069 3070 i_size_write(dir, sb->s_blocksize); 3071 dir->i_mtime = dir->i_ctime = CURRENT_TIME; 3072 3073 di->i_size = cpu_to_le64(sb->s_blocksize); 3074 di->i_ctime = di->i_mtime = cpu_to_le64(dir->i_ctime.tv_sec); 3075 di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(dir->i_ctime.tv_nsec); 3076 3077 /* 3078 * This should never fail as our extent list is empty and all 3079 * related blocks have been journaled already. 3080 */ 3081 ret = ocfs2_insert_extent(handle, &et, 0, blkno, len, 3082 0, NULL); 3083 if (ret) { 3084 mlog_errno(ret); 3085 goto out_commit; 3086 } 3087 3088 /* 3089 * Set i_blocks after the extent insert for the most up to 3090 * date ip_clusters value. 3091 */ 3092 dir->i_blocks = ocfs2_inode_sector_count(dir); 3093 3094 ocfs2_journal_dirty(handle, di_bh); 3095 3096 if (ocfs2_supports_indexed_dirs(osb)) { 3097 ret = ocfs2_dx_dir_attach_index(osb, handle, dir, di_bh, 3098 dirdata_bh, meta_ac, dx_inline, 3099 num_dx_entries, &dx_root_bh); 3100 if (ret) { 3101 mlog_errno(ret); 3102 goto out_commit; 3103 } 3104 3105 if (dx_inline) { 3106 ocfs2_dx_dir_index_root_block(dir, dx_root_bh, 3107 dirdata_bh); 3108 } else { 3109 ocfs2_init_dx_root_extent_tree(&dx_et, 3110 INODE_CACHE(dir), 3111 dx_root_bh); 3112 ret = ocfs2_insert_extent(handle, &dx_et, 0, 3113 dx_insert_blkno, 1, 0, NULL); 3114 if (ret) 3115 mlog_errno(ret); 3116 } 3117 } 3118 3119 /* 3120 * We asked for two clusters, but only got one in the 1st 3121 * pass. Claim the 2nd cluster as a separate extent. 3122 */ 3123 if (alloc > len) { 3124 ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off, 3125 &len); 3126 if (ret) { 3127 mlog_errno(ret); 3128 goto out_commit; 3129 } 3130 blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off); 3131 3132 ret = ocfs2_insert_extent(handle, &et, 1, 3133 blkno, len, 0, NULL); 3134 if (ret) { 3135 mlog_errno(ret); 3136 goto out_commit; 3137 } 3138 bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1); 3139 } 3140 3141 *first_block_bh = dirdata_bh; 3142 dirdata_bh = NULL; 3143 if (ocfs2_supports_indexed_dirs(osb)) { 3144 unsigned int off; 3145 3146 if (!dx_inline) { 3147 /* 3148 * We need to return the correct block within the 3149 * cluster which should hold our entry. 3150 */ 3151 off = ocfs2_dx_dir_hash_idx(OCFS2_SB(dir->i_sb), 3152 &lookup->dl_hinfo); 3153 get_bh(dx_leaves[off]); 3154 lookup->dl_dx_leaf_bh = dx_leaves[off]; 3155 } 3156 lookup->dl_dx_root_bh = dx_root_bh; 3157 dx_root_bh = NULL; 3158 } 3159 3160 out_commit: 3161 if (ret < 0 && did_quota) 3162 dquot_free_space_nodirty(dir, bytes_allocated); 3163 3164 ocfs2_commit_trans(osb, handle); 3165 3166 out: 3167 up_write(&oi->ip_alloc_sem); 3168 if (data_ac) 3169 ocfs2_free_alloc_context(data_ac); 3170 if (meta_ac) 3171 ocfs2_free_alloc_context(meta_ac); 3172 3173 if (dx_leaves) { 3174 for (i = 0; i < num_dx_leaves; i++) 3175 brelse(dx_leaves[i]); 3176 kfree(dx_leaves); 3177 } 3178 3179 brelse(dirdata_bh); 3180 brelse(dx_root_bh); 3181 3182 return ret; 3183 } 3184 3185 /* returns a bh of the 1st new block in the allocation. */ 3186 static int ocfs2_do_extend_dir(struct super_block *sb, 3187 handle_t *handle, 3188 struct inode *dir, 3189 struct buffer_head *parent_fe_bh, 3190 struct ocfs2_alloc_context *data_ac, 3191 struct ocfs2_alloc_context *meta_ac, 3192 struct buffer_head **new_bh) 3193 { 3194 int status; 3195 int extend, did_quota = 0; 3196 u64 p_blkno, v_blkno; 3197 3198 spin_lock(&OCFS2_I(dir)->ip_lock); 3199 extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)); 3200 spin_unlock(&OCFS2_I(dir)->ip_lock); 3201 3202 if (extend) { 3203 u32 offset = OCFS2_I(dir)->ip_clusters; 3204 3205 status = dquot_alloc_space_nodirty(dir, 3206 ocfs2_clusters_to_bytes(sb, 1)); 3207 if (status) 3208 goto bail; 3209 did_quota = 1; 3210 3211 status = ocfs2_add_inode_data(OCFS2_SB(sb), dir, &offset, 3212 1, 0, parent_fe_bh, handle, 3213 data_ac, meta_ac, NULL); 3214 BUG_ON(status == -EAGAIN); 3215 if (status < 0) { 3216 mlog_errno(status); 3217 goto bail; 3218 } 3219 } 3220 3221 v_blkno = ocfs2_blocks_for_bytes(sb, i_size_read(dir)); 3222 status = ocfs2_extent_map_get_blocks(dir, v_blkno, &p_blkno, NULL, NULL); 3223 if (status < 0) { 3224 mlog_errno(status); 3225 goto bail; 3226 } 3227 3228 *new_bh = sb_getblk(sb, p_blkno); 3229 if (!*new_bh) { 3230 status = -EIO; 3231 mlog_errno(status); 3232 goto bail; 3233 } 3234 status = 0; 3235 bail: 3236 if (did_quota && status < 0) 3237 dquot_free_space_nodirty(dir, ocfs2_clusters_to_bytes(sb, 1)); 3238 mlog_exit(status); 3239 return status; 3240 } 3241 3242 /* 3243 * Assumes you already have a cluster lock on the directory. 3244 * 3245 * 'blocks_wanted' is only used if we have an inline directory which 3246 * is to be turned into an extent based one. The size of the dirent to 3247 * insert might be larger than the space gained by growing to just one 3248 * block, so we may have to grow the inode by two blocks in that case. 3249 * 3250 * If the directory is already indexed, dx_root_bh must be provided. 3251 */ 3252 static int ocfs2_extend_dir(struct ocfs2_super *osb, 3253 struct inode *dir, 3254 struct buffer_head *parent_fe_bh, 3255 unsigned int blocks_wanted, 3256 struct ocfs2_dir_lookup_result *lookup, 3257 struct buffer_head **new_de_bh) 3258 { 3259 int status = 0; 3260 int credits, num_free_extents, drop_alloc_sem = 0; 3261 loff_t dir_i_size; 3262 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; 3263 struct ocfs2_extent_list *el = &fe->id2.i_list; 3264 struct ocfs2_alloc_context *data_ac = NULL; 3265 struct ocfs2_alloc_context *meta_ac = NULL; 3266 handle_t *handle = NULL; 3267 struct buffer_head *new_bh = NULL; 3268 struct ocfs2_dir_entry * de; 3269 struct super_block *sb = osb->sb; 3270 struct ocfs2_extent_tree et; 3271 struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh; 3272 3273 mlog_entry_void(); 3274 3275 if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 3276 /* 3277 * This would be a code error as an inline directory should 3278 * never have an index root. 3279 */ 3280 BUG_ON(dx_root_bh); 3281 3282 status = ocfs2_expand_inline_dir(dir, parent_fe_bh, 3283 blocks_wanted, lookup, 3284 &new_bh); 3285 if (status) { 3286 mlog_errno(status); 3287 goto bail; 3288 } 3289 3290 /* Expansion from inline to an indexed directory will 3291 * have given us this. */ 3292 dx_root_bh = lookup->dl_dx_root_bh; 3293 3294 if (blocks_wanted == 1) { 3295 /* 3296 * If the new dirent will fit inside the space 3297 * created by pushing out to one block, then 3298 * we can complete the operation 3299 * here. Otherwise we have to expand i_size 3300 * and format the 2nd block below. 3301 */ 3302 BUG_ON(new_bh == NULL); 3303 goto bail_bh; 3304 } 3305 3306 /* 3307 * Get rid of 'new_bh' - we want to format the 2nd 3308 * data block and return that instead. 3309 */ 3310 brelse(new_bh); 3311 new_bh = NULL; 3312 3313 down_write(&OCFS2_I(dir)->ip_alloc_sem); 3314 drop_alloc_sem = 1; 3315 dir_i_size = i_size_read(dir); 3316 credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS; 3317 goto do_extend; 3318 } 3319 3320 down_write(&OCFS2_I(dir)->ip_alloc_sem); 3321 drop_alloc_sem = 1; 3322 dir_i_size = i_size_read(dir); 3323 mlog(0, "extending dir %llu (i_size = %lld)\n", 3324 (unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size); 3325 3326 /* dir->i_size is always block aligned. */ 3327 spin_lock(&OCFS2_I(dir)->ip_lock); 3328 if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) { 3329 spin_unlock(&OCFS2_I(dir)->ip_lock); 3330 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(dir), 3331 parent_fe_bh); 3332 num_free_extents = ocfs2_num_free_extents(osb, &et); 3333 if (num_free_extents < 0) { 3334 status = num_free_extents; 3335 mlog_errno(status); 3336 goto bail; 3337 } 3338 3339 if (!num_free_extents) { 3340 status = ocfs2_reserve_new_metadata(osb, el, &meta_ac); 3341 if (status < 0) { 3342 if (status != -ENOSPC) 3343 mlog_errno(status); 3344 goto bail; 3345 } 3346 } 3347 3348 status = ocfs2_reserve_clusters(osb, 1, &data_ac); 3349 if (status < 0) { 3350 if (status != -ENOSPC) 3351 mlog_errno(status); 3352 goto bail; 3353 } 3354 3355 if (ocfs2_dir_resv_allowed(osb)) 3356 data_ac->ac_resv = &OCFS2_I(dir)->ip_la_data_resv; 3357 3358 credits = ocfs2_calc_extend_credits(sb, el, 1); 3359 } else { 3360 spin_unlock(&OCFS2_I(dir)->ip_lock); 3361 credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS; 3362 } 3363 3364 do_extend: 3365 if (ocfs2_dir_indexed(dir)) 3366 credits++; /* For attaching the new dirent block to the 3367 * dx_root */ 3368 3369 handle = ocfs2_start_trans(osb, credits); 3370 if (IS_ERR(handle)) { 3371 status = PTR_ERR(handle); 3372 handle = NULL; 3373 mlog_errno(status); 3374 goto bail; 3375 } 3376 3377 status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh, 3378 data_ac, meta_ac, &new_bh); 3379 if (status < 0) { 3380 mlog_errno(status); 3381 goto bail; 3382 } 3383 3384 ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), new_bh); 3385 3386 status = ocfs2_journal_access_db(handle, INODE_CACHE(dir), new_bh, 3387 OCFS2_JOURNAL_ACCESS_CREATE); 3388 if (status < 0) { 3389 mlog_errno(status); 3390 goto bail; 3391 } 3392 memset(new_bh->b_data, 0, sb->s_blocksize); 3393 3394 de = (struct ocfs2_dir_entry *) new_bh->b_data; 3395 de->inode = 0; 3396 if (ocfs2_supports_dir_trailer(dir)) { 3397 de->rec_len = cpu_to_le16(ocfs2_dir_trailer_blk_off(sb)); 3398 3399 ocfs2_init_dir_trailer(dir, new_bh, le16_to_cpu(de->rec_len)); 3400 3401 if (ocfs2_dir_indexed(dir)) { 3402 status = ocfs2_dx_dir_link_trailer(dir, handle, 3403 dx_root_bh, new_bh); 3404 if (status) { 3405 mlog_errno(status); 3406 goto bail; 3407 } 3408 } 3409 } else { 3410 de->rec_len = cpu_to_le16(sb->s_blocksize); 3411 } 3412 ocfs2_journal_dirty(handle, new_bh); 3413 3414 dir_i_size += dir->i_sb->s_blocksize; 3415 i_size_write(dir, dir_i_size); 3416 dir->i_blocks = ocfs2_inode_sector_count(dir); 3417 status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); 3418 if (status < 0) { 3419 mlog_errno(status); 3420 goto bail; 3421 } 3422 3423 bail_bh: 3424 *new_de_bh = new_bh; 3425 get_bh(*new_de_bh); 3426 bail: 3427 if (handle) 3428 ocfs2_commit_trans(osb, handle); 3429 if (drop_alloc_sem) 3430 up_write(&OCFS2_I(dir)->ip_alloc_sem); 3431 3432 if (data_ac) 3433 ocfs2_free_alloc_context(data_ac); 3434 if (meta_ac) 3435 ocfs2_free_alloc_context(meta_ac); 3436 3437 brelse(new_bh); 3438 3439 mlog_exit(status); 3440 return status; 3441 } 3442 3443 static int ocfs2_find_dir_space_id(struct inode *dir, struct buffer_head *di_bh, 3444 const char *name, int namelen, 3445 struct buffer_head **ret_de_bh, 3446 unsigned int *blocks_wanted) 3447 { 3448 int ret; 3449 struct super_block *sb = dir->i_sb; 3450 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 3451 struct ocfs2_dir_entry *de, *last_de = NULL; 3452 char *de_buf, *limit; 3453 unsigned long offset = 0; 3454 unsigned int rec_len, new_rec_len, free_space = dir->i_sb->s_blocksize; 3455 3456 /* 3457 * This calculates how many free bytes we'd have in block zero, should 3458 * this function force expansion to an extent tree. 3459 */ 3460 if (ocfs2_new_dir_wants_trailer(dir)) 3461 free_space = ocfs2_dir_trailer_blk_off(sb) - i_size_read(dir); 3462 else 3463 free_space = dir->i_sb->s_blocksize - i_size_read(dir); 3464 3465 de_buf = di->id2.i_data.id_data; 3466 limit = de_buf + i_size_read(dir); 3467 rec_len = OCFS2_DIR_REC_LEN(namelen); 3468 3469 while (de_buf < limit) { 3470 de = (struct ocfs2_dir_entry *)de_buf; 3471 3472 if (!ocfs2_check_dir_entry(dir, de, di_bh, offset)) { 3473 ret = -ENOENT; 3474 goto out; 3475 } 3476 if (ocfs2_match(namelen, name, de)) { 3477 ret = -EEXIST; 3478 goto out; 3479 } 3480 /* 3481 * No need to check for a trailing dirent record here as 3482 * they're not used for inline dirs. 3483 */ 3484 3485 if (ocfs2_dirent_would_fit(de, rec_len)) { 3486 /* Ok, we found a spot. Return this bh and let 3487 * the caller actually fill it in. */ 3488 *ret_de_bh = di_bh; 3489 get_bh(*ret_de_bh); 3490 ret = 0; 3491 goto out; 3492 } 3493 3494 last_de = de; 3495 de_buf += le16_to_cpu(de->rec_len); 3496 offset += le16_to_cpu(de->rec_len); 3497 } 3498 3499 /* 3500 * We're going to require expansion of the directory - figure 3501 * out how many blocks we'll need so that a place for the 3502 * dirent can be found. 3503 */ 3504 *blocks_wanted = 1; 3505 new_rec_len = le16_to_cpu(last_de->rec_len) + free_space; 3506 if (new_rec_len < (rec_len + OCFS2_DIR_REC_LEN(last_de->name_len))) 3507 *blocks_wanted = 2; 3508 3509 ret = -ENOSPC; 3510 out: 3511 return ret; 3512 } 3513 3514 static int ocfs2_find_dir_space_el(struct inode *dir, const char *name, 3515 int namelen, struct buffer_head **ret_de_bh) 3516 { 3517 unsigned long offset; 3518 struct buffer_head *bh = NULL; 3519 unsigned short rec_len; 3520 struct ocfs2_dir_entry *de; 3521 struct super_block *sb = dir->i_sb; 3522 int status; 3523 int blocksize = dir->i_sb->s_blocksize; 3524 3525 status = ocfs2_read_dir_block(dir, 0, &bh, 0); 3526 if (status) { 3527 mlog_errno(status); 3528 goto bail; 3529 } 3530 3531 rec_len = OCFS2_DIR_REC_LEN(namelen); 3532 offset = 0; 3533 de = (struct ocfs2_dir_entry *) bh->b_data; 3534 while (1) { 3535 if ((char *)de >= sb->s_blocksize + bh->b_data) { 3536 brelse(bh); 3537 bh = NULL; 3538 3539 if (i_size_read(dir) <= offset) { 3540 /* 3541 * Caller will have to expand this 3542 * directory. 3543 */ 3544 status = -ENOSPC; 3545 goto bail; 3546 } 3547 status = ocfs2_read_dir_block(dir, 3548 offset >> sb->s_blocksize_bits, 3549 &bh, 0); 3550 if (status) { 3551 mlog_errno(status); 3552 goto bail; 3553 } 3554 /* move to next block */ 3555 de = (struct ocfs2_dir_entry *) bh->b_data; 3556 } 3557 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { 3558 status = -ENOENT; 3559 goto bail; 3560 } 3561 if (ocfs2_match(namelen, name, de)) { 3562 status = -EEXIST; 3563 goto bail; 3564 } 3565 3566 if (ocfs2_skip_dir_trailer(dir, de, offset % blocksize, 3567 blocksize)) 3568 goto next; 3569 3570 if (ocfs2_dirent_would_fit(de, rec_len)) { 3571 /* Ok, we found a spot. Return this bh and let 3572 * the caller actually fill it in. */ 3573 *ret_de_bh = bh; 3574 get_bh(*ret_de_bh); 3575 status = 0; 3576 goto bail; 3577 } 3578 next: 3579 offset += le16_to_cpu(de->rec_len); 3580 de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len)); 3581 } 3582 3583 status = 0; 3584 bail: 3585 brelse(bh); 3586 3587 mlog_exit(status); 3588 return status; 3589 } 3590 3591 static int dx_leaf_sort_cmp(const void *a, const void *b) 3592 { 3593 const struct ocfs2_dx_entry *entry1 = a; 3594 const struct ocfs2_dx_entry *entry2 = b; 3595 u32 major_hash1 = le32_to_cpu(entry1->dx_major_hash); 3596 u32 major_hash2 = le32_to_cpu(entry2->dx_major_hash); 3597 u32 minor_hash1 = le32_to_cpu(entry1->dx_minor_hash); 3598 u32 minor_hash2 = le32_to_cpu(entry2->dx_minor_hash); 3599 3600 if (major_hash1 > major_hash2) 3601 return 1; 3602 if (major_hash1 < major_hash2) 3603 return -1; 3604 3605 /* 3606 * It is not strictly necessary to sort by minor 3607 */ 3608 if (minor_hash1 > minor_hash2) 3609 return 1; 3610 if (minor_hash1 < minor_hash2) 3611 return -1; 3612 return 0; 3613 } 3614 3615 static void dx_leaf_sort_swap(void *a, void *b, int size) 3616 { 3617 struct ocfs2_dx_entry *entry1 = a; 3618 struct ocfs2_dx_entry *entry2 = b; 3619 struct ocfs2_dx_entry tmp; 3620 3621 BUG_ON(size != sizeof(*entry1)); 3622 3623 tmp = *entry1; 3624 *entry1 = *entry2; 3625 *entry2 = tmp; 3626 } 3627 3628 static int ocfs2_dx_leaf_same_major(struct ocfs2_dx_leaf *dx_leaf) 3629 { 3630 struct ocfs2_dx_entry_list *dl_list = &dx_leaf->dl_list; 3631 int i, num = le16_to_cpu(dl_list->de_num_used); 3632 3633 for (i = 0; i < (num - 1); i++) { 3634 if (le32_to_cpu(dl_list->de_entries[i].dx_major_hash) != 3635 le32_to_cpu(dl_list->de_entries[i + 1].dx_major_hash)) 3636 return 0; 3637 } 3638 3639 return 1; 3640 } 3641 3642 /* 3643 * Find the optimal value to split this leaf on. This expects the leaf 3644 * entries to be in sorted order. 3645 * 3646 * leaf_cpos is the cpos of the leaf we're splitting. insert_hash is 3647 * the hash we want to insert. 3648 * 3649 * This function is only concerned with the major hash - that which 3650 * determines which cluster an item belongs to. 3651 */ 3652 static int ocfs2_dx_dir_find_leaf_split(struct ocfs2_dx_leaf *dx_leaf, 3653 u32 leaf_cpos, u32 insert_hash, 3654 u32 *split_hash) 3655 { 3656 struct ocfs2_dx_entry_list *dl_list = &dx_leaf->dl_list; 3657 int i, num_used = le16_to_cpu(dl_list->de_num_used); 3658 int allsame; 3659 3660 /* 3661 * There's a couple rare, but nasty corner cases we have to 3662 * check for here. All of them involve a leaf where all value 3663 * have the same hash, which is what we look for first. 3664 * 3665 * Most of the time, all of the above is false, and we simply 3666 * pick the median value for a split. 3667 */ 3668 allsame = ocfs2_dx_leaf_same_major(dx_leaf); 3669 if (allsame) { 3670 u32 val = le32_to_cpu(dl_list->de_entries[0].dx_major_hash); 3671 3672 if (val == insert_hash) { 3673 /* 3674 * No matter where we would choose to split, 3675 * the new entry would want to occupy the same 3676 * block as these. Since there's no space left 3677 * in their existing block, we know there 3678 * won't be space after the split. 3679 */ 3680 return -ENOSPC; 3681 } 3682 3683 if (val == leaf_cpos) { 3684 /* 3685 * Because val is the same as leaf_cpos (which 3686 * is the smallest value this leaf can have), 3687 * yet is not equal to insert_hash, then we 3688 * know that insert_hash *must* be larger than 3689 * val (and leaf_cpos). At least cpos+1 in value. 3690 * 3691 * We also know then, that there cannot be an 3692 * adjacent extent (otherwise we'd be looking 3693 * at it). Choosing this value gives us a 3694 * chance to get some contiguousness. 3695 */ 3696 *split_hash = leaf_cpos + 1; 3697 return 0; 3698 } 3699 3700 if (val > insert_hash) { 3701 /* 3702 * val can not be the same as insert hash, and 3703 * also must be larger than leaf_cpos. Also, 3704 * we know that there can't be a leaf between 3705 * cpos and val, otherwise the entries with 3706 * hash 'val' would be there. 3707 */ 3708 *split_hash = val; 3709 return 0; 3710 } 3711 3712 *split_hash = insert_hash; 3713 return 0; 3714 } 3715 3716 /* 3717 * Since the records are sorted and the checks above 3718 * guaranteed that not all records in this block are the same, 3719 * we simple travel forward, from the median, and pick the 1st 3720 * record whose value is larger than leaf_cpos. 3721 */ 3722 for (i = (num_used / 2); i < num_used; i++) 3723 if (le32_to_cpu(dl_list->de_entries[i].dx_major_hash) > 3724 leaf_cpos) 3725 break; 3726 3727 BUG_ON(i == num_used); /* Should be impossible */ 3728 *split_hash = le32_to_cpu(dl_list->de_entries[i].dx_major_hash); 3729 return 0; 3730 } 3731 3732 /* 3733 * Transfer all entries in orig_dx_leaves whose major hash is equal to or 3734 * larger than split_hash into new_dx_leaves. We use a temporary 3735 * buffer (tmp_dx_leaf) to make the changes to the original leaf blocks. 3736 * 3737 * Since the block offset inside a leaf (cluster) is a constant mask 3738 * of minor_hash, we can optimize - an item at block offset X within 3739 * the original cluster, will be at offset X within the new cluster. 3740 */ 3741 static void ocfs2_dx_dir_transfer_leaf(struct inode *dir, u32 split_hash, 3742 handle_t *handle, 3743 struct ocfs2_dx_leaf *tmp_dx_leaf, 3744 struct buffer_head **orig_dx_leaves, 3745 struct buffer_head **new_dx_leaves, 3746 int num_dx_leaves) 3747 { 3748 int i, j, num_used; 3749 u32 major_hash; 3750 struct ocfs2_dx_leaf *orig_dx_leaf, *new_dx_leaf; 3751 struct ocfs2_dx_entry_list *orig_list, *new_list, *tmp_list; 3752 struct ocfs2_dx_entry *dx_entry; 3753 3754 tmp_list = &tmp_dx_leaf->dl_list; 3755 3756 for (i = 0; i < num_dx_leaves; i++) { 3757 orig_dx_leaf = (struct ocfs2_dx_leaf *) orig_dx_leaves[i]->b_data; 3758 orig_list = &orig_dx_leaf->dl_list; 3759 new_dx_leaf = (struct ocfs2_dx_leaf *) new_dx_leaves[i]->b_data; 3760 new_list = &new_dx_leaf->dl_list; 3761 3762 num_used = le16_to_cpu(orig_list->de_num_used); 3763 3764 memcpy(tmp_dx_leaf, orig_dx_leaf, dir->i_sb->s_blocksize); 3765 tmp_list->de_num_used = cpu_to_le16(0); 3766 memset(&tmp_list->de_entries, 0, sizeof(*dx_entry)*num_used); 3767 3768 for (j = 0; j < num_used; j++) { 3769 dx_entry = &orig_list->de_entries[j]; 3770 major_hash = le32_to_cpu(dx_entry->dx_major_hash); 3771 if (major_hash >= split_hash) 3772 ocfs2_dx_dir_leaf_insert_tail(new_dx_leaf, 3773 dx_entry); 3774 else 3775 ocfs2_dx_dir_leaf_insert_tail(tmp_dx_leaf, 3776 dx_entry); 3777 } 3778 memcpy(orig_dx_leaf, tmp_dx_leaf, dir->i_sb->s_blocksize); 3779 3780 ocfs2_journal_dirty(handle, orig_dx_leaves[i]); 3781 ocfs2_journal_dirty(handle, new_dx_leaves[i]); 3782 } 3783 } 3784 3785 static int ocfs2_dx_dir_rebalance_credits(struct ocfs2_super *osb, 3786 struct ocfs2_dx_root_block *dx_root) 3787 { 3788 int credits = ocfs2_clusters_to_blocks(osb->sb, 2); 3789 3790 credits += ocfs2_calc_extend_credits(osb->sb, &dx_root->dr_list, 1); 3791 credits += ocfs2_quota_trans_credits(osb->sb); 3792 return credits; 3793 } 3794 3795 /* 3796 * Find the median value in dx_leaf_bh and allocate a new leaf to move 3797 * half our entries into. 3798 */ 3799 static int ocfs2_dx_dir_rebalance(struct ocfs2_super *osb, struct inode *dir, 3800 struct buffer_head *dx_root_bh, 3801 struct buffer_head *dx_leaf_bh, 3802 struct ocfs2_dx_hinfo *hinfo, u32 leaf_cpos, 3803 u64 leaf_blkno) 3804 { 3805 struct ocfs2_dx_leaf *dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data; 3806 int credits, ret, i, num_used, did_quota = 0; 3807 u32 cpos, split_hash, insert_hash = hinfo->major_hash; 3808 u64 orig_leaves_start; 3809 int num_dx_leaves; 3810 struct buffer_head **orig_dx_leaves = NULL; 3811 struct buffer_head **new_dx_leaves = NULL; 3812 struct ocfs2_alloc_context *data_ac = NULL, *meta_ac = NULL; 3813 struct ocfs2_extent_tree et; 3814 handle_t *handle = NULL; 3815 struct ocfs2_dx_root_block *dx_root; 3816 struct ocfs2_dx_leaf *tmp_dx_leaf = NULL; 3817 3818 mlog(0, "DX Dir: %llu, rebalance leaf leaf_blkno: %llu insert: %u\n", 3819 (unsigned long long)OCFS2_I(dir)->ip_blkno, 3820 (unsigned long long)leaf_blkno, insert_hash); 3821 3822 ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh); 3823 3824 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 3825 /* 3826 * XXX: This is a rather large limit. We should use a more 3827 * realistic value. 3828 */ 3829 if (le32_to_cpu(dx_root->dr_clusters) == UINT_MAX) 3830 return -ENOSPC; 3831 3832 num_used = le16_to_cpu(dx_leaf->dl_list.de_num_used); 3833 if (num_used < le16_to_cpu(dx_leaf->dl_list.de_count)) { 3834 mlog(ML_ERROR, "DX Dir: %llu, Asked to rebalance empty leaf: " 3835 "%llu, %d\n", (unsigned long long)OCFS2_I(dir)->ip_blkno, 3836 (unsigned long long)leaf_blkno, num_used); 3837 ret = -EIO; 3838 goto out; 3839 } 3840 3841 orig_dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, &num_dx_leaves); 3842 if (!orig_dx_leaves) { 3843 ret = -ENOMEM; 3844 mlog_errno(ret); 3845 goto out; 3846 } 3847 3848 new_dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, NULL); 3849 if (!new_dx_leaves) { 3850 ret = -ENOMEM; 3851 mlog_errno(ret); 3852 goto out; 3853 } 3854 3855 ret = ocfs2_lock_allocators(dir, &et, 1, 0, &data_ac, &meta_ac); 3856 if (ret) { 3857 if (ret != -ENOSPC) 3858 mlog_errno(ret); 3859 goto out; 3860 } 3861 3862 credits = ocfs2_dx_dir_rebalance_credits(osb, dx_root); 3863 handle = ocfs2_start_trans(osb, credits); 3864 if (IS_ERR(handle)) { 3865 ret = PTR_ERR(handle); 3866 handle = NULL; 3867 mlog_errno(ret); 3868 goto out; 3869 } 3870 3871 ret = dquot_alloc_space_nodirty(dir, 3872 ocfs2_clusters_to_bytes(dir->i_sb, 1)); 3873 if (ret) 3874 goto out_commit; 3875 did_quota = 1; 3876 3877 ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), dx_leaf_bh, 3878 OCFS2_JOURNAL_ACCESS_WRITE); 3879 if (ret) { 3880 mlog_errno(ret); 3881 goto out_commit; 3882 } 3883 3884 /* 3885 * This block is changing anyway, so we can sort it in place. 3886 */ 3887 sort(dx_leaf->dl_list.de_entries, num_used, 3888 sizeof(struct ocfs2_dx_entry), dx_leaf_sort_cmp, 3889 dx_leaf_sort_swap); 3890 3891 ocfs2_journal_dirty(handle, dx_leaf_bh); 3892 3893 ret = ocfs2_dx_dir_find_leaf_split(dx_leaf, leaf_cpos, insert_hash, 3894 &split_hash); 3895 if (ret) { 3896 mlog_errno(ret); 3897 goto out_commit; 3898 } 3899 3900 mlog(0, "Split leaf (%u) at %u, insert major hash is %u\n", 3901 leaf_cpos, split_hash, insert_hash); 3902 3903 /* 3904 * We have to carefully order operations here. There are items 3905 * which want to be in the new cluster before insert, but in 3906 * order to put those items in the new cluster, we alter the 3907 * old cluster. A failure to insert gets nasty. 3908 * 3909 * So, start by reserving writes to the old 3910 * cluster. ocfs2_dx_dir_new_cluster will reserve writes on 3911 * the new cluster for us, before inserting it. The insert 3912 * won't happen if there's an error before that. Once the 3913 * insert is done then, we can transfer from one leaf into the 3914 * other without fear of hitting any error. 3915 */ 3916 3917 /* 3918 * The leaf transfer wants some scratch space so that we don't 3919 * wind up doing a bunch of expensive memmove(). 3920 */ 3921 tmp_dx_leaf = kmalloc(osb->sb->s_blocksize, GFP_NOFS); 3922 if (!tmp_dx_leaf) { 3923 ret = -ENOMEM; 3924 mlog_errno(ret); 3925 goto out_commit; 3926 } 3927 3928 orig_leaves_start = ocfs2_block_to_cluster_start(dir->i_sb, leaf_blkno); 3929 ret = ocfs2_read_dx_leaves(dir, orig_leaves_start, num_dx_leaves, 3930 orig_dx_leaves); 3931 if (ret) { 3932 mlog_errno(ret); 3933 goto out_commit; 3934 } 3935 3936 cpos = split_hash; 3937 ret = ocfs2_dx_dir_new_cluster(dir, &et, cpos, handle, 3938 data_ac, meta_ac, new_dx_leaves, 3939 num_dx_leaves); 3940 if (ret) { 3941 mlog_errno(ret); 3942 goto out_commit; 3943 } 3944 3945 for (i = 0; i < num_dx_leaves; i++) { 3946 ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), 3947 orig_dx_leaves[i], 3948 OCFS2_JOURNAL_ACCESS_WRITE); 3949 if (ret) { 3950 mlog_errno(ret); 3951 goto out_commit; 3952 } 3953 3954 ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), 3955 new_dx_leaves[i], 3956 OCFS2_JOURNAL_ACCESS_WRITE); 3957 if (ret) { 3958 mlog_errno(ret); 3959 goto out_commit; 3960 } 3961 } 3962 3963 ocfs2_dx_dir_transfer_leaf(dir, split_hash, handle, tmp_dx_leaf, 3964 orig_dx_leaves, new_dx_leaves, num_dx_leaves); 3965 3966 out_commit: 3967 if (ret < 0 && did_quota) 3968 dquot_free_space_nodirty(dir, 3969 ocfs2_clusters_to_bytes(dir->i_sb, 1)); 3970 3971 ocfs2_commit_trans(osb, handle); 3972 3973 out: 3974 if (orig_dx_leaves || new_dx_leaves) { 3975 for (i = 0; i < num_dx_leaves; i++) { 3976 if (orig_dx_leaves) 3977 brelse(orig_dx_leaves[i]); 3978 if (new_dx_leaves) 3979 brelse(new_dx_leaves[i]); 3980 } 3981 kfree(orig_dx_leaves); 3982 kfree(new_dx_leaves); 3983 } 3984 3985 if (meta_ac) 3986 ocfs2_free_alloc_context(meta_ac); 3987 if (data_ac) 3988 ocfs2_free_alloc_context(data_ac); 3989 3990 kfree(tmp_dx_leaf); 3991 return ret; 3992 } 3993 3994 static int ocfs2_find_dir_space_dx(struct ocfs2_super *osb, struct inode *dir, 3995 struct buffer_head *di_bh, 3996 struct buffer_head *dx_root_bh, 3997 const char *name, int namelen, 3998 struct ocfs2_dir_lookup_result *lookup) 3999 { 4000 int ret, rebalanced = 0; 4001 struct ocfs2_dx_root_block *dx_root; 4002 struct buffer_head *dx_leaf_bh = NULL; 4003 struct ocfs2_dx_leaf *dx_leaf; 4004 u64 blkno; 4005 u32 leaf_cpos; 4006 4007 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 4008 4009 restart_search: 4010 ret = ocfs2_dx_dir_lookup(dir, &dx_root->dr_list, &lookup->dl_hinfo, 4011 &leaf_cpos, &blkno); 4012 if (ret) { 4013 mlog_errno(ret); 4014 goto out; 4015 } 4016 4017 ret = ocfs2_read_dx_leaf(dir, blkno, &dx_leaf_bh); 4018 if (ret) { 4019 mlog_errno(ret); 4020 goto out; 4021 } 4022 4023 dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data; 4024 4025 if (le16_to_cpu(dx_leaf->dl_list.de_num_used) >= 4026 le16_to_cpu(dx_leaf->dl_list.de_count)) { 4027 if (rebalanced) { 4028 /* 4029 * Rebalancing should have provided us with 4030 * space in an appropriate leaf. 4031 * 4032 * XXX: Is this an abnormal condition then? 4033 * Should we print a message here? 4034 */ 4035 ret = -ENOSPC; 4036 goto out; 4037 } 4038 4039 ret = ocfs2_dx_dir_rebalance(osb, dir, dx_root_bh, dx_leaf_bh, 4040 &lookup->dl_hinfo, leaf_cpos, 4041 blkno); 4042 if (ret) { 4043 if (ret != -ENOSPC) 4044 mlog_errno(ret); 4045 goto out; 4046 } 4047 4048 /* 4049 * Restart the lookup. The rebalance might have 4050 * changed which block our item fits into. Mark our 4051 * progress, so we only execute this once. 4052 */ 4053 brelse(dx_leaf_bh); 4054 dx_leaf_bh = NULL; 4055 rebalanced = 1; 4056 goto restart_search; 4057 } 4058 4059 lookup->dl_dx_leaf_bh = dx_leaf_bh; 4060 dx_leaf_bh = NULL; 4061 4062 out: 4063 brelse(dx_leaf_bh); 4064 return ret; 4065 } 4066 4067 static int ocfs2_search_dx_free_list(struct inode *dir, 4068 struct buffer_head *dx_root_bh, 4069 int namelen, 4070 struct ocfs2_dir_lookup_result *lookup) 4071 { 4072 int ret = -ENOSPC; 4073 struct buffer_head *leaf_bh = NULL, *prev_leaf_bh = NULL; 4074 struct ocfs2_dir_block_trailer *db; 4075 u64 next_block; 4076 int rec_len = OCFS2_DIR_REC_LEN(namelen); 4077 struct ocfs2_dx_root_block *dx_root; 4078 4079 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 4080 next_block = le64_to_cpu(dx_root->dr_free_blk); 4081 4082 while (next_block) { 4083 brelse(prev_leaf_bh); 4084 prev_leaf_bh = leaf_bh; 4085 leaf_bh = NULL; 4086 4087 ret = ocfs2_read_dir_block_direct(dir, next_block, &leaf_bh); 4088 if (ret) { 4089 mlog_errno(ret); 4090 goto out; 4091 } 4092 4093 db = ocfs2_trailer_from_bh(leaf_bh, dir->i_sb); 4094 if (rec_len <= le16_to_cpu(db->db_free_rec_len)) { 4095 lookup->dl_leaf_bh = leaf_bh; 4096 lookup->dl_prev_leaf_bh = prev_leaf_bh; 4097 leaf_bh = NULL; 4098 prev_leaf_bh = NULL; 4099 break; 4100 } 4101 4102 next_block = le64_to_cpu(db->db_free_next); 4103 } 4104 4105 if (!next_block) 4106 ret = -ENOSPC; 4107 4108 out: 4109 4110 brelse(leaf_bh); 4111 brelse(prev_leaf_bh); 4112 return ret; 4113 } 4114 4115 static int ocfs2_expand_inline_dx_root(struct inode *dir, 4116 struct buffer_head *dx_root_bh) 4117 { 4118 int ret, num_dx_leaves, i, j, did_quota = 0; 4119 struct buffer_head **dx_leaves = NULL; 4120 struct ocfs2_extent_tree et; 4121 u64 insert_blkno; 4122 struct ocfs2_alloc_context *data_ac = NULL; 4123 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 4124 handle_t *handle = NULL; 4125 struct ocfs2_dx_root_block *dx_root; 4126 struct ocfs2_dx_entry_list *entry_list; 4127 struct ocfs2_dx_entry *dx_entry; 4128 struct ocfs2_dx_leaf *target_leaf; 4129 4130 ret = ocfs2_reserve_clusters(osb, 1, &data_ac); 4131 if (ret) { 4132 mlog_errno(ret); 4133 goto out; 4134 } 4135 4136 dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, &num_dx_leaves); 4137 if (!dx_leaves) { 4138 ret = -ENOMEM; 4139 mlog_errno(ret); 4140 goto out; 4141 } 4142 4143 handle = ocfs2_start_trans(osb, ocfs2_calc_dxi_expand_credits(osb->sb)); 4144 if (IS_ERR(handle)) { 4145 ret = PTR_ERR(handle); 4146 mlog_errno(ret); 4147 goto out; 4148 } 4149 4150 ret = dquot_alloc_space_nodirty(dir, 4151 ocfs2_clusters_to_bytes(osb->sb, 1)); 4152 if (ret) 4153 goto out_commit; 4154 did_quota = 1; 4155 4156 /* 4157 * We do this up front, before the allocation, so that a 4158 * failure to add the dx_root_bh to the journal won't result 4159 * us losing clusters. 4160 */ 4161 ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh, 4162 OCFS2_JOURNAL_ACCESS_WRITE); 4163 if (ret) { 4164 mlog_errno(ret); 4165 goto out_commit; 4166 } 4167 4168 ret = __ocfs2_dx_dir_new_cluster(dir, 0, handle, data_ac, dx_leaves, 4169 num_dx_leaves, &insert_blkno); 4170 if (ret) { 4171 mlog_errno(ret); 4172 goto out_commit; 4173 } 4174 4175 /* 4176 * Transfer the entries from our dx_root into the appropriate 4177 * block 4178 */ 4179 dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data; 4180 entry_list = &dx_root->dr_entries; 4181 4182 for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) { 4183 dx_entry = &entry_list->de_entries[i]; 4184 4185 j = __ocfs2_dx_dir_hash_idx(osb, 4186 le32_to_cpu(dx_entry->dx_minor_hash)); 4187 target_leaf = (struct ocfs2_dx_leaf *)dx_leaves[j]->b_data; 4188 4189 ocfs2_dx_dir_leaf_insert_tail(target_leaf, dx_entry); 4190 4191 /* Each leaf has been passed to the journal already 4192 * via __ocfs2_dx_dir_new_cluster() */ 4193 } 4194 4195 dx_root->dr_flags &= ~OCFS2_DX_FLAG_INLINE; 4196 memset(&dx_root->dr_list, 0, osb->sb->s_blocksize - 4197 offsetof(struct ocfs2_dx_root_block, dr_list)); 4198 dx_root->dr_list.l_count = 4199 cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb)); 4200 4201 /* This should never fail considering we start with an empty 4202 * dx_root. */ 4203 ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh); 4204 ret = ocfs2_insert_extent(handle, &et, 0, insert_blkno, 1, 0, NULL); 4205 if (ret) 4206 mlog_errno(ret); 4207 did_quota = 0; 4208 4209 ocfs2_journal_dirty(handle, dx_root_bh); 4210 4211 out_commit: 4212 if (ret < 0 && did_quota) 4213 dquot_free_space_nodirty(dir, 4214 ocfs2_clusters_to_bytes(dir->i_sb, 1)); 4215 4216 ocfs2_commit_trans(osb, handle); 4217 4218 out: 4219 if (data_ac) 4220 ocfs2_free_alloc_context(data_ac); 4221 4222 if (dx_leaves) { 4223 for (i = 0; i < num_dx_leaves; i++) 4224 brelse(dx_leaves[i]); 4225 kfree(dx_leaves); 4226 } 4227 return ret; 4228 } 4229 4230 static int ocfs2_inline_dx_has_space(struct buffer_head *dx_root_bh) 4231 { 4232 struct ocfs2_dx_root_block *dx_root; 4233 struct ocfs2_dx_entry_list *entry_list; 4234 4235 dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data; 4236 entry_list = &dx_root->dr_entries; 4237 4238 if (le16_to_cpu(entry_list->de_num_used) >= 4239 le16_to_cpu(entry_list->de_count)) 4240 return -ENOSPC; 4241 4242 return 0; 4243 } 4244 4245 static int ocfs2_prepare_dx_dir_for_insert(struct inode *dir, 4246 struct buffer_head *di_bh, 4247 const char *name, 4248 int namelen, 4249 struct ocfs2_dir_lookup_result *lookup) 4250 { 4251 int ret, free_dx_root = 1; 4252 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 4253 struct buffer_head *dx_root_bh = NULL; 4254 struct buffer_head *leaf_bh = NULL; 4255 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 4256 struct ocfs2_dx_root_block *dx_root; 4257 4258 ret = ocfs2_read_dx_root(dir, di, &dx_root_bh); 4259 if (ret) { 4260 mlog_errno(ret); 4261 goto out; 4262 } 4263 4264 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 4265 if (le32_to_cpu(dx_root->dr_num_entries) == OCFS2_DX_ENTRIES_MAX) { 4266 ret = -ENOSPC; 4267 mlog_errno(ret); 4268 goto out; 4269 } 4270 4271 if (ocfs2_dx_root_inline(dx_root)) { 4272 ret = ocfs2_inline_dx_has_space(dx_root_bh); 4273 4274 if (ret == 0) 4275 goto search_el; 4276 4277 /* 4278 * We ran out of room in the root block. Expand it to 4279 * an extent, then allow ocfs2_find_dir_space_dx to do 4280 * the rest. 4281 */ 4282 ret = ocfs2_expand_inline_dx_root(dir, dx_root_bh); 4283 if (ret) { 4284 mlog_errno(ret); 4285 goto out; 4286 } 4287 } 4288 4289 /* 4290 * Insert preparation for an indexed directory is split into two 4291 * steps. The call to find_dir_space_dx reserves room in the index for 4292 * an additional item. If we run out of space there, it's a real error 4293 * we can't continue on. 4294 */ 4295 ret = ocfs2_find_dir_space_dx(osb, dir, di_bh, dx_root_bh, name, 4296 namelen, lookup); 4297 if (ret) { 4298 mlog_errno(ret); 4299 goto out; 4300 } 4301 4302 search_el: 4303 /* 4304 * Next, we need to find space in the unindexed tree. This call 4305 * searches using the free space linked list. If the unindexed tree 4306 * lacks sufficient space, we'll expand it below. The expansion code 4307 * is smart enough to add any new blocks to the free space list. 4308 */ 4309 ret = ocfs2_search_dx_free_list(dir, dx_root_bh, namelen, lookup); 4310 if (ret && ret != -ENOSPC) { 4311 mlog_errno(ret); 4312 goto out; 4313 } 4314 4315 /* Do this up here - ocfs2_extend_dir might need the dx_root */ 4316 lookup->dl_dx_root_bh = dx_root_bh; 4317 free_dx_root = 0; 4318 4319 if (ret == -ENOSPC) { 4320 ret = ocfs2_extend_dir(osb, dir, di_bh, 1, lookup, &leaf_bh); 4321 4322 if (ret) { 4323 mlog_errno(ret); 4324 goto out; 4325 } 4326 4327 /* 4328 * We make the assumption here that new leaf blocks are added 4329 * to the front of our free list. 4330 */ 4331 lookup->dl_prev_leaf_bh = NULL; 4332 lookup->dl_leaf_bh = leaf_bh; 4333 } 4334 4335 out: 4336 if (free_dx_root) 4337 brelse(dx_root_bh); 4338 return ret; 4339 } 4340 4341 /* 4342 * Get a directory ready for insert. Any directory allocation required 4343 * happens here. Success returns zero, and enough context in the dir 4344 * lookup result that ocfs2_add_entry() will be able complete the task 4345 * with minimal performance impact. 4346 */ 4347 int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb, 4348 struct inode *dir, 4349 struct buffer_head *parent_fe_bh, 4350 const char *name, 4351 int namelen, 4352 struct ocfs2_dir_lookup_result *lookup) 4353 { 4354 int ret; 4355 unsigned int blocks_wanted = 1; 4356 struct buffer_head *bh = NULL; 4357 4358 mlog(0, "getting ready to insert namelen %d into dir %llu\n", 4359 namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno); 4360 4361 if (!namelen) { 4362 ret = -EINVAL; 4363 mlog_errno(ret); 4364 goto out; 4365 } 4366 4367 /* 4368 * Do this up front to reduce confusion. 4369 * 4370 * The directory might start inline, then be turned into an 4371 * indexed one, in which case we'd need to hash deep inside 4372 * ocfs2_find_dir_space_id(). Since 4373 * ocfs2_prepare_dx_dir_for_insert() also needs this hash 4374 * done, there seems no point in spreading out the calls. We 4375 * can optimize away the case where the file system doesn't 4376 * support indexing. 4377 */ 4378 if (ocfs2_supports_indexed_dirs(osb)) 4379 ocfs2_dx_dir_name_hash(dir, name, namelen, &lookup->dl_hinfo); 4380 4381 if (ocfs2_dir_indexed(dir)) { 4382 ret = ocfs2_prepare_dx_dir_for_insert(dir, parent_fe_bh, 4383 name, namelen, lookup); 4384 if (ret) 4385 mlog_errno(ret); 4386 goto out; 4387 } 4388 4389 if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 4390 ret = ocfs2_find_dir_space_id(dir, parent_fe_bh, name, 4391 namelen, &bh, &blocks_wanted); 4392 } else 4393 ret = ocfs2_find_dir_space_el(dir, name, namelen, &bh); 4394 4395 if (ret && ret != -ENOSPC) { 4396 mlog_errno(ret); 4397 goto out; 4398 } 4399 4400 if (ret == -ENOSPC) { 4401 /* 4402 * We have to expand the directory to add this name. 4403 */ 4404 BUG_ON(bh); 4405 4406 ret = ocfs2_extend_dir(osb, dir, parent_fe_bh, blocks_wanted, 4407 lookup, &bh); 4408 if (ret) { 4409 if (ret != -ENOSPC) 4410 mlog_errno(ret); 4411 goto out; 4412 } 4413 4414 BUG_ON(!bh); 4415 } 4416 4417 lookup->dl_leaf_bh = bh; 4418 bh = NULL; 4419 out: 4420 brelse(bh); 4421 return ret; 4422 } 4423 4424 static int ocfs2_dx_dir_remove_index(struct inode *dir, 4425 struct buffer_head *di_bh, 4426 struct buffer_head *dx_root_bh) 4427 { 4428 int ret; 4429 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 4430 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 4431 struct ocfs2_dx_root_block *dx_root; 4432 struct inode *dx_alloc_inode = NULL; 4433 struct buffer_head *dx_alloc_bh = NULL; 4434 handle_t *handle; 4435 u64 blk; 4436 u16 bit; 4437 u64 bg_blkno; 4438 4439 dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data; 4440 4441 dx_alloc_inode = ocfs2_get_system_file_inode(osb, 4442 EXTENT_ALLOC_SYSTEM_INODE, 4443 le16_to_cpu(dx_root->dr_suballoc_slot)); 4444 if (!dx_alloc_inode) { 4445 ret = -ENOMEM; 4446 mlog_errno(ret); 4447 goto out; 4448 } 4449 mutex_lock(&dx_alloc_inode->i_mutex); 4450 4451 ret = ocfs2_inode_lock(dx_alloc_inode, &dx_alloc_bh, 1); 4452 if (ret) { 4453 mlog_errno(ret); 4454 goto out_mutex; 4455 } 4456 4457 handle = ocfs2_start_trans(osb, OCFS2_DX_ROOT_REMOVE_CREDITS); 4458 if (IS_ERR(handle)) { 4459 ret = PTR_ERR(handle); 4460 mlog_errno(ret); 4461 goto out_unlock; 4462 } 4463 4464 ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh, 4465 OCFS2_JOURNAL_ACCESS_WRITE); 4466 if (ret) { 4467 mlog_errno(ret); 4468 goto out_commit; 4469 } 4470 4471 spin_lock(&OCFS2_I(dir)->ip_lock); 4472 OCFS2_I(dir)->ip_dyn_features &= ~OCFS2_INDEXED_DIR_FL; 4473 di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features); 4474 spin_unlock(&OCFS2_I(dir)->ip_lock); 4475 di->i_dx_root = cpu_to_le64(0ULL); 4476 4477 ocfs2_journal_dirty(handle, di_bh); 4478 4479 blk = le64_to_cpu(dx_root->dr_blkno); 4480 bit = le16_to_cpu(dx_root->dr_suballoc_bit); 4481 if (dx_root->dr_suballoc_loc) 4482 bg_blkno = le64_to_cpu(dx_root->dr_suballoc_loc); 4483 else 4484 bg_blkno = ocfs2_which_suballoc_group(blk, bit); 4485 ret = ocfs2_free_suballoc_bits(handle, dx_alloc_inode, dx_alloc_bh, 4486 bit, bg_blkno, 1); 4487 if (ret) 4488 mlog_errno(ret); 4489 4490 out_commit: 4491 ocfs2_commit_trans(osb, handle); 4492 4493 out_unlock: 4494 ocfs2_inode_unlock(dx_alloc_inode, 1); 4495 4496 out_mutex: 4497 mutex_unlock(&dx_alloc_inode->i_mutex); 4498 brelse(dx_alloc_bh); 4499 out: 4500 iput(dx_alloc_inode); 4501 return ret; 4502 } 4503 4504 int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh) 4505 { 4506 int ret; 4507 unsigned int uninitialized_var(clen); 4508 u32 major_hash = UINT_MAX, p_cpos, uninitialized_var(cpos); 4509 u64 uninitialized_var(blkno); 4510 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 4511 struct buffer_head *dx_root_bh = NULL; 4512 struct ocfs2_dx_root_block *dx_root; 4513 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 4514 struct ocfs2_cached_dealloc_ctxt dealloc; 4515 struct ocfs2_extent_tree et; 4516 4517 ocfs2_init_dealloc_ctxt(&dealloc); 4518 4519 if (!ocfs2_dir_indexed(dir)) 4520 return 0; 4521 4522 ret = ocfs2_read_dx_root(dir, di, &dx_root_bh); 4523 if (ret) { 4524 mlog_errno(ret); 4525 goto out; 4526 } 4527 dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; 4528 4529 if (ocfs2_dx_root_inline(dx_root)) 4530 goto remove_index; 4531 4532 ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh); 4533 4534 /* XXX: What if dr_clusters is too large? */ 4535 while (le32_to_cpu(dx_root->dr_clusters)) { 4536 ret = ocfs2_dx_dir_lookup_rec(dir, &dx_root->dr_list, 4537 major_hash, &cpos, &blkno, &clen); 4538 if (ret) { 4539 mlog_errno(ret); 4540 goto out; 4541 } 4542 4543 p_cpos = ocfs2_blocks_to_clusters(dir->i_sb, blkno); 4544 4545 ret = ocfs2_remove_btree_range(dir, &et, cpos, p_cpos, clen, 0, 4546 &dealloc, 0); 4547 if (ret) { 4548 mlog_errno(ret); 4549 goto out; 4550 } 4551 4552 if (cpos == 0) 4553 break; 4554 4555 major_hash = cpos - 1; 4556 } 4557 4558 remove_index: 4559 ret = ocfs2_dx_dir_remove_index(dir, di_bh, dx_root_bh); 4560 if (ret) { 4561 mlog_errno(ret); 4562 goto out; 4563 } 4564 4565 ocfs2_remove_from_cache(INODE_CACHE(dir), dx_root_bh); 4566 out: 4567 ocfs2_schedule_truncate_log_flush(osb, 1); 4568 ocfs2_run_deallocs(osb, &dealloc); 4569 4570 brelse(dx_root_bh); 4571 return ret; 4572 } 4573