1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * xattr.c 5 * 6 * Copyright (C) 2008 Oracle. All rights reserved. 7 * 8 * CREDITS: 9 * Lots of code in this file is taken from ext3. 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public 13 * License as published by the Free Software Foundation; either 14 * version 2 of the License, or (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public 22 * License along with this program; if not, write to the 23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 24 * Boston, MA 021110-1307, USA. 25 */ 26 27 #include <linux/capability.h> 28 #include <linux/fs.h> 29 #include <linux/types.h> 30 #include <linux/slab.h> 31 #include <linux/highmem.h> 32 #include <linux/pagemap.h> 33 #include <linux/uio.h> 34 #include <linux/sched.h> 35 #include <linux/splice.h> 36 #include <linux/mount.h> 37 #include <linux/writeback.h> 38 #include <linux/falloc.h> 39 #include <linux/sort.h> 40 41 #define MLOG_MASK_PREFIX ML_XATTR 42 #include <cluster/masklog.h> 43 44 #include "ocfs2.h" 45 #include "alloc.h" 46 #include "dlmglue.h" 47 #include "file.h" 48 #include "symlink.h" 49 #include "sysfile.h" 50 #include "inode.h" 51 #include "journal.h" 52 #include "ocfs2_fs.h" 53 #include "suballoc.h" 54 #include "uptodate.h" 55 #include "buffer_head_io.h" 56 #include "super.h" 57 #include "xattr.h" 58 59 60 struct ocfs2_xattr_def_value_root { 61 struct ocfs2_xattr_value_root xv; 62 struct ocfs2_extent_rec er; 63 }; 64 65 struct ocfs2_xattr_bucket { 66 struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET]; 67 struct ocfs2_xattr_header *xh; 68 }; 69 70 #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root)) 71 #define OCFS2_XATTR_INLINE_SIZE 80 72 73 static struct ocfs2_xattr_def_value_root def_xv = { 74 .xv.xr_list.l_count = cpu_to_le16(1), 75 }; 76 77 struct xattr_handler *ocfs2_xattr_handlers[] = { 78 &ocfs2_xattr_user_handler, 79 &ocfs2_xattr_trusted_handler, 80 NULL 81 }; 82 83 static struct xattr_handler *ocfs2_xattr_handler_map[] = { 84 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler, 85 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler, 86 }; 87 88 struct ocfs2_xattr_info { 89 int name_index; 90 const char *name; 91 const void *value; 92 size_t value_len; 93 }; 94 95 struct ocfs2_xattr_search { 96 struct buffer_head *inode_bh; 97 /* 98 * xattr_bh point to the block buffer head which has extended attribute 99 * when extended attribute in inode, xattr_bh is equal to inode_bh. 100 */ 101 struct buffer_head *xattr_bh; 102 struct ocfs2_xattr_header *header; 103 struct ocfs2_xattr_bucket bucket; 104 void *base; 105 void *end; 106 struct ocfs2_xattr_entry *here; 107 int not_found; 108 }; 109 110 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, 111 struct ocfs2_xattr_header *xh, 112 int index, 113 int *block_off, 114 int *new_offset); 115 116 static int ocfs2_xattr_index_block_find(struct inode *inode, 117 struct buffer_head *root_bh, 118 int name_index, 119 const char *name, 120 struct ocfs2_xattr_search *xs); 121 122 static int ocfs2_xattr_tree_list_index_block(struct inode *inode, 123 struct ocfs2_xattr_tree_root *xt, 124 char *buffer, 125 size_t buffer_size); 126 127 static int ocfs2_xattr_create_index_block(struct inode *inode, 128 struct ocfs2_xattr_search *xs); 129 130 static int ocfs2_xattr_set_entry_index_block(struct inode *inode, 131 struct ocfs2_xattr_info *xi, 132 struct ocfs2_xattr_search *xs); 133 134 static int ocfs2_delete_xattr_index_block(struct inode *inode, 135 struct buffer_head *xb_bh); 136 137 static inline struct xattr_handler *ocfs2_xattr_handler(int name_index) 138 { 139 struct xattr_handler *handler = NULL; 140 141 if (name_index > 0 && name_index < OCFS2_XATTR_MAX) 142 handler = ocfs2_xattr_handler_map[name_index]; 143 144 return handler; 145 } 146 147 static inline u32 ocfs2_xattr_name_hash(struct inode *inode, 148 char *prefix, 149 int prefix_len, 150 char *name, 151 int name_len) 152 { 153 /* Get hash value of uuid from super block */ 154 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash; 155 int i; 156 157 /* hash extended attribute prefix */ 158 for (i = 0; i < prefix_len; i++) { 159 hash = (hash << OCFS2_HASH_SHIFT) ^ 160 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^ 161 *prefix++; 162 } 163 /* hash extended attribute name */ 164 for (i = 0; i < name_len; i++) { 165 hash = (hash << OCFS2_HASH_SHIFT) ^ 166 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^ 167 *name++; 168 } 169 170 return hash; 171 } 172 173 /* 174 * ocfs2_xattr_hash_entry() 175 * 176 * Compute the hash of an extended attribute. 177 */ 178 static void ocfs2_xattr_hash_entry(struct inode *inode, 179 struct ocfs2_xattr_header *header, 180 struct ocfs2_xattr_entry *entry) 181 { 182 u32 hash = 0; 183 struct xattr_handler *handler = 184 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); 185 char *prefix = handler->prefix; 186 char *name = (char *)header + le16_to_cpu(entry->xe_name_offset); 187 int prefix_len = strlen(handler->prefix); 188 189 hash = ocfs2_xattr_name_hash(inode, prefix, prefix_len, name, 190 entry->xe_name_len); 191 entry->xe_name_hash = cpu_to_le32(hash); 192 193 return; 194 } 195 196 static int ocfs2_xattr_extend_allocation(struct inode *inode, 197 u32 clusters_to_add, 198 struct buffer_head *xattr_bh, 199 struct ocfs2_xattr_value_root *xv) 200 { 201 int status = 0; 202 int restart_func = 0; 203 int credits = 0; 204 handle_t *handle = NULL; 205 struct ocfs2_alloc_context *data_ac = NULL; 206 struct ocfs2_alloc_context *meta_ac = NULL; 207 enum ocfs2_alloc_restarted why; 208 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 209 u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters); 210 struct ocfs2_extent_tree et; 211 212 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add); 213 214 ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv); 215 216 restart_all: 217 218 status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, 219 &data_ac, &meta_ac); 220 if (status) { 221 mlog_errno(status); 222 goto leave; 223 } 224 225 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el, 226 clusters_to_add); 227 handle = ocfs2_start_trans(osb, credits); 228 if (IS_ERR(handle)) { 229 status = PTR_ERR(handle); 230 handle = NULL; 231 mlog_errno(status); 232 goto leave; 233 } 234 235 restarted_transaction: 236 status = ocfs2_journal_access(handle, inode, xattr_bh, 237 OCFS2_JOURNAL_ACCESS_WRITE); 238 if (status < 0) { 239 mlog_errno(status); 240 goto leave; 241 } 242 243 prev_clusters = le32_to_cpu(xv->xr_clusters); 244 status = ocfs2_add_clusters_in_btree(osb, 245 inode, 246 &logical_start, 247 clusters_to_add, 248 0, 249 &et, 250 handle, 251 data_ac, 252 meta_ac, 253 &why); 254 if ((status < 0) && (status != -EAGAIN)) { 255 if (status != -ENOSPC) 256 mlog_errno(status); 257 goto leave; 258 } 259 260 status = ocfs2_journal_dirty(handle, xattr_bh); 261 if (status < 0) { 262 mlog_errno(status); 263 goto leave; 264 } 265 266 clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters; 267 268 if (why != RESTART_NONE && clusters_to_add) { 269 if (why == RESTART_META) { 270 mlog(0, "restarting function.\n"); 271 restart_func = 1; 272 } else { 273 BUG_ON(why != RESTART_TRANS); 274 275 mlog(0, "restarting transaction.\n"); 276 /* TODO: This can be more intelligent. */ 277 credits = ocfs2_calc_extend_credits(osb->sb, 278 et.et_root_el, 279 clusters_to_add); 280 status = ocfs2_extend_trans(handle, credits); 281 if (status < 0) { 282 /* handle still has to be committed at 283 * this point. */ 284 status = -ENOMEM; 285 mlog_errno(status); 286 goto leave; 287 } 288 goto restarted_transaction; 289 } 290 } 291 292 leave: 293 if (handle) { 294 ocfs2_commit_trans(osb, handle); 295 handle = NULL; 296 } 297 if (data_ac) { 298 ocfs2_free_alloc_context(data_ac); 299 data_ac = NULL; 300 } 301 if (meta_ac) { 302 ocfs2_free_alloc_context(meta_ac); 303 meta_ac = NULL; 304 } 305 if ((!status) && restart_func) { 306 restart_func = 0; 307 goto restart_all; 308 } 309 310 return status; 311 } 312 313 static int __ocfs2_remove_xattr_range(struct inode *inode, 314 struct buffer_head *root_bh, 315 struct ocfs2_xattr_value_root *xv, 316 u32 cpos, u32 phys_cpos, u32 len, 317 struct ocfs2_cached_dealloc_ctxt *dealloc) 318 { 319 int ret; 320 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); 321 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 322 struct inode *tl_inode = osb->osb_tl_inode; 323 handle_t *handle; 324 struct ocfs2_alloc_context *meta_ac = NULL; 325 struct ocfs2_extent_tree et; 326 327 ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv); 328 329 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac); 330 if (ret) { 331 mlog_errno(ret); 332 return ret; 333 } 334 335 mutex_lock(&tl_inode->i_mutex); 336 337 if (ocfs2_truncate_log_needs_flush(osb)) { 338 ret = __ocfs2_flush_truncate_log(osb); 339 if (ret < 0) { 340 mlog_errno(ret); 341 goto out; 342 } 343 } 344 345 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 346 if (IS_ERR(handle)) { 347 ret = PTR_ERR(handle); 348 mlog_errno(ret); 349 goto out; 350 } 351 352 ret = ocfs2_journal_access(handle, inode, root_bh, 353 OCFS2_JOURNAL_ACCESS_WRITE); 354 if (ret) { 355 mlog_errno(ret); 356 goto out_commit; 357 } 358 359 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac, 360 dealloc); 361 if (ret) { 362 mlog_errno(ret); 363 goto out_commit; 364 } 365 366 le32_add_cpu(&xv->xr_clusters, -len); 367 368 ret = ocfs2_journal_dirty(handle, root_bh); 369 if (ret) { 370 mlog_errno(ret); 371 goto out_commit; 372 } 373 374 ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len); 375 if (ret) 376 mlog_errno(ret); 377 378 out_commit: 379 ocfs2_commit_trans(osb, handle); 380 out: 381 mutex_unlock(&tl_inode->i_mutex); 382 383 if (meta_ac) 384 ocfs2_free_alloc_context(meta_ac); 385 386 return ret; 387 } 388 389 static int ocfs2_xattr_shrink_size(struct inode *inode, 390 u32 old_clusters, 391 u32 new_clusters, 392 struct buffer_head *root_bh, 393 struct ocfs2_xattr_value_root *xv) 394 { 395 int ret = 0; 396 u32 trunc_len, cpos, phys_cpos, alloc_size; 397 u64 block; 398 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 399 struct ocfs2_cached_dealloc_ctxt dealloc; 400 401 ocfs2_init_dealloc_ctxt(&dealloc); 402 403 if (old_clusters <= new_clusters) 404 return 0; 405 406 cpos = new_clusters; 407 trunc_len = old_clusters - new_clusters; 408 while (trunc_len) { 409 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos, 410 &alloc_size, &xv->xr_list); 411 if (ret) { 412 mlog_errno(ret); 413 goto out; 414 } 415 416 if (alloc_size > trunc_len) 417 alloc_size = trunc_len; 418 419 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos, 420 phys_cpos, alloc_size, 421 &dealloc); 422 if (ret) { 423 mlog_errno(ret); 424 goto out; 425 } 426 427 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); 428 ocfs2_remove_xattr_clusters_from_cache(inode, block, 429 alloc_size); 430 cpos += alloc_size; 431 trunc_len -= alloc_size; 432 } 433 434 out: 435 ocfs2_schedule_truncate_log_flush(osb, 1); 436 ocfs2_run_deallocs(osb, &dealloc); 437 438 return ret; 439 } 440 441 static int ocfs2_xattr_value_truncate(struct inode *inode, 442 struct buffer_head *root_bh, 443 struct ocfs2_xattr_value_root *xv, 444 int len) 445 { 446 int ret; 447 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len); 448 u32 old_clusters = le32_to_cpu(xv->xr_clusters); 449 450 if (new_clusters == old_clusters) 451 return 0; 452 453 if (new_clusters > old_clusters) 454 ret = ocfs2_xattr_extend_allocation(inode, 455 new_clusters - old_clusters, 456 root_bh, xv); 457 else 458 ret = ocfs2_xattr_shrink_size(inode, 459 old_clusters, new_clusters, 460 root_bh, xv); 461 462 return ret; 463 } 464 465 static int ocfs2_xattr_list_entries(struct inode *inode, 466 struct ocfs2_xattr_header *header, 467 char *buffer, size_t buffer_size) 468 { 469 size_t rest = buffer_size; 470 int i; 471 472 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) { 473 struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; 474 struct xattr_handler *handler = 475 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); 476 477 if (handler) { 478 size_t size = handler->list(inode, buffer, rest, 479 ((char *)header + 480 le16_to_cpu(entry->xe_name_offset)), 481 entry->xe_name_len); 482 if (buffer) { 483 if (size > rest) 484 return -ERANGE; 485 buffer += size; 486 } 487 rest -= size; 488 } 489 } 490 491 return buffer_size - rest; 492 } 493 494 static int ocfs2_xattr_ibody_list(struct inode *inode, 495 struct ocfs2_dinode *di, 496 char *buffer, 497 size_t buffer_size) 498 { 499 struct ocfs2_xattr_header *header = NULL; 500 struct ocfs2_inode_info *oi = OCFS2_I(inode); 501 int ret = 0; 502 503 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) 504 return ret; 505 506 header = (struct ocfs2_xattr_header *) 507 ((void *)di + inode->i_sb->s_blocksize - 508 le16_to_cpu(di->i_xattr_inline_size)); 509 510 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size); 511 512 return ret; 513 } 514 515 static int ocfs2_xattr_block_list(struct inode *inode, 516 struct ocfs2_dinode *di, 517 char *buffer, 518 size_t buffer_size) 519 { 520 struct buffer_head *blk_bh = NULL; 521 struct ocfs2_xattr_block *xb; 522 int ret = 0; 523 524 if (!di->i_xattr_loc) 525 return ret; 526 527 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 528 le64_to_cpu(di->i_xattr_loc), 529 &blk_bh, OCFS2_BH_CACHED, inode); 530 if (ret < 0) { 531 mlog_errno(ret); 532 return ret; 533 } 534 /*Verify the signature of xattr block*/ 535 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 536 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 537 ret = -EFAULT; 538 goto cleanup; 539 } 540 541 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 542 543 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 544 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header; 545 ret = ocfs2_xattr_list_entries(inode, header, 546 buffer, buffer_size); 547 } else { 548 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root; 549 ret = ocfs2_xattr_tree_list_index_block(inode, xt, 550 buffer, buffer_size); 551 } 552 cleanup: 553 brelse(blk_bh); 554 555 return ret; 556 } 557 558 ssize_t ocfs2_listxattr(struct dentry *dentry, 559 char *buffer, 560 size_t size) 561 { 562 int ret = 0, i_ret = 0, b_ret = 0; 563 struct buffer_head *di_bh = NULL; 564 struct ocfs2_dinode *di = NULL; 565 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode); 566 567 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb))) 568 return -EOPNOTSUPP; 569 570 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 571 return ret; 572 573 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0); 574 if (ret < 0) { 575 mlog_errno(ret); 576 return ret; 577 } 578 579 di = (struct ocfs2_dinode *)di_bh->b_data; 580 581 down_read(&oi->ip_xattr_sem); 582 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size); 583 if (i_ret < 0) 584 b_ret = 0; 585 else { 586 if (buffer) { 587 buffer += i_ret; 588 size -= i_ret; 589 } 590 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di, 591 buffer, size); 592 if (b_ret < 0) 593 i_ret = 0; 594 } 595 up_read(&oi->ip_xattr_sem); 596 ocfs2_inode_unlock(dentry->d_inode, 0); 597 598 brelse(di_bh); 599 600 return i_ret + b_ret; 601 } 602 603 static int ocfs2_xattr_find_entry(int name_index, 604 const char *name, 605 struct ocfs2_xattr_search *xs) 606 { 607 struct ocfs2_xattr_entry *entry; 608 size_t name_len; 609 int i, cmp = 1; 610 611 if (name == NULL) 612 return -EINVAL; 613 614 name_len = strlen(name); 615 entry = xs->here; 616 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) { 617 cmp = name_index - ocfs2_xattr_get_type(entry); 618 if (!cmp) 619 cmp = name_len - entry->xe_name_len; 620 if (!cmp) 621 cmp = memcmp(name, (xs->base + 622 le16_to_cpu(entry->xe_name_offset)), 623 name_len); 624 if (cmp == 0) 625 break; 626 entry += 1; 627 } 628 xs->here = entry; 629 630 return cmp ? -ENODATA : 0; 631 } 632 633 static int ocfs2_xattr_get_value_outside(struct inode *inode, 634 struct ocfs2_xattr_value_root *xv, 635 void *buffer, 636 size_t len) 637 { 638 u32 cpos, p_cluster, num_clusters, bpc, clusters; 639 u64 blkno; 640 int i, ret = 0; 641 size_t cplen, blocksize; 642 struct buffer_head *bh = NULL; 643 struct ocfs2_extent_list *el; 644 645 el = &xv->xr_list; 646 clusters = le32_to_cpu(xv->xr_clusters); 647 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 648 blocksize = inode->i_sb->s_blocksize; 649 650 cpos = 0; 651 while (cpos < clusters) { 652 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, 653 &num_clusters, el); 654 if (ret) { 655 mlog_errno(ret); 656 goto out; 657 } 658 659 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); 660 /* Copy ocfs2_xattr_value */ 661 for (i = 0; i < num_clusters * bpc; i++, blkno++) { 662 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 663 &bh, OCFS2_BH_CACHED, inode); 664 if (ret) { 665 mlog_errno(ret); 666 goto out; 667 } 668 669 cplen = len >= blocksize ? blocksize : len; 670 memcpy(buffer, bh->b_data, cplen); 671 len -= cplen; 672 buffer += cplen; 673 674 brelse(bh); 675 bh = NULL; 676 if (len == 0) 677 break; 678 } 679 cpos += num_clusters; 680 } 681 out: 682 return ret; 683 } 684 685 static int ocfs2_xattr_ibody_get(struct inode *inode, 686 int name_index, 687 const char *name, 688 void *buffer, 689 size_t buffer_size, 690 struct ocfs2_xattr_search *xs) 691 { 692 struct ocfs2_inode_info *oi = OCFS2_I(inode); 693 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 694 struct ocfs2_xattr_value_root *xv; 695 size_t size; 696 int ret = 0; 697 698 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) 699 return -ENODATA; 700 701 xs->end = (void *)di + inode->i_sb->s_blocksize; 702 xs->header = (struct ocfs2_xattr_header *) 703 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 704 xs->base = (void *)xs->header; 705 xs->here = xs->header->xh_entries; 706 707 ret = ocfs2_xattr_find_entry(name_index, name, xs); 708 if (ret) 709 return ret; 710 size = le64_to_cpu(xs->here->xe_value_size); 711 if (buffer) { 712 if (size > buffer_size) 713 return -ERANGE; 714 if (ocfs2_xattr_is_local(xs->here)) { 715 memcpy(buffer, (void *)xs->base + 716 le16_to_cpu(xs->here->xe_name_offset) + 717 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size); 718 } else { 719 xv = (struct ocfs2_xattr_value_root *) 720 (xs->base + le16_to_cpu( 721 xs->here->xe_name_offset) + 722 OCFS2_XATTR_SIZE(xs->here->xe_name_len)); 723 ret = ocfs2_xattr_get_value_outside(inode, xv, 724 buffer, size); 725 if (ret < 0) { 726 mlog_errno(ret); 727 return ret; 728 } 729 } 730 } 731 732 return size; 733 } 734 735 static int ocfs2_xattr_block_get(struct inode *inode, 736 int name_index, 737 const char *name, 738 void *buffer, 739 size_t buffer_size, 740 struct ocfs2_xattr_search *xs) 741 { 742 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 743 struct buffer_head *blk_bh = NULL; 744 struct ocfs2_xattr_block *xb; 745 struct ocfs2_xattr_value_root *xv; 746 size_t size; 747 int ret = -ENODATA, name_offset, name_len, block_off, i; 748 749 if (!di->i_xattr_loc) 750 return ret; 751 752 memset(&xs->bucket, 0, sizeof(xs->bucket)); 753 754 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 755 le64_to_cpu(di->i_xattr_loc), 756 &blk_bh, OCFS2_BH_CACHED, inode); 757 if (ret < 0) { 758 mlog_errno(ret); 759 return ret; 760 } 761 /*Verify the signature of xattr block*/ 762 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 763 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 764 ret = -EFAULT; 765 goto cleanup; 766 } 767 768 xs->xattr_bh = blk_bh; 769 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 770 771 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 772 xs->header = &xb->xb_attrs.xb_header; 773 xs->base = (void *)xs->header; 774 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 775 xs->here = xs->header->xh_entries; 776 777 ret = ocfs2_xattr_find_entry(name_index, name, xs); 778 } else 779 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 780 name_index, 781 name, xs); 782 783 if (ret) 784 goto cleanup; 785 size = le64_to_cpu(xs->here->xe_value_size); 786 if (buffer) { 787 ret = -ERANGE; 788 if (size > buffer_size) 789 goto cleanup; 790 791 name_offset = le16_to_cpu(xs->here->xe_name_offset); 792 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len); 793 i = xs->here - xs->header->xh_entries; 794 795 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) { 796 ret = ocfs2_xattr_bucket_get_name_value(inode, 797 xs->bucket.xh, 798 i, 799 &block_off, 800 &name_offset); 801 xs->base = xs->bucket.bhs[block_off]->b_data; 802 } 803 if (ocfs2_xattr_is_local(xs->here)) { 804 memcpy(buffer, (void *)xs->base + 805 name_offset + name_len, size); 806 } else { 807 xv = (struct ocfs2_xattr_value_root *) 808 (xs->base + name_offset + name_len); 809 ret = ocfs2_xattr_get_value_outside(inode, xv, 810 buffer, size); 811 if (ret < 0) { 812 mlog_errno(ret); 813 goto cleanup; 814 } 815 } 816 } 817 ret = size; 818 cleanup: 819 for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++) 820 brelse(xs->bucket.bhs[i]); 821 memset(&xs->bucket, 0, sizeof(xs->bucket)); 822 823 brelse(blk_bh); 824 return ret; 825 } 826 827 /* ocfs2_xattr_get() 828 * 829 * Copy an extended attribute into the buffer provided. 830 * Buffer is NULL to compute the size of buffer required. 831 */ 832 int ocfs2_xattr_get(struct inode *inode, 833 int name_index, 834 const char *name, 835 void *buffer, 836 size_t buffer_size) 837 { 838 int ret; 839 struct ocfs2_dinode *di = NULL; 840 struct buffer_head *di_bh = NULL; 841 struct ocfs2_inode_info *oi = OCFS2_I(inode); 842 struct ocfs2_xattr_search xis = { 843 .not_found = -ENODATA, 844 }; 845 struct ocfs2_xattr_search xbs = { 846 .not_found = -ENODATA, 847 }; 848 849 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 850 return -EOPNOTSUPP; 851 852 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 853 ret = -ENODATA; 854 855 ret = ocfs2_inode_lock(inode, &di_bh, 0); 856 if (ret < 0) { 857 mlog_errno(ret); 858 return ret; 859 } 860 xis.inode_bh = xbs.inode_bh = di_bh; 861 di = (struct ocfs2_dinode *)di_bh->b_data; 862 863 down_read(&oi->ip_xattr_sem); 864 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer, 865 buffer_size, &xis); 866 if (ret == -ENODATA) 867 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer, 868 buffer_size, &xbs); 869 up_read(&oi->ip_xattr_sem); 870 ocfs2_inode_unlock(inode, 0); 871 872 brelse(di_bh); 873 874 return ret; 875 } 876 877 static int __ocfs2_xattr_set_value_outside(struct inode *inode, 878 struct ocfs2_xattr_value_root *xv, 879 const void *value, 880 int value_len) 881 { 882 int ret = 0, i, cp_len, credits; 883 u16 blocksize = inode->i_sb->s_blocksize; 884 u32 p_cluster, num_clusters; 885 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 886 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len); 887 u64 blkno; 888 struct buffer_head *bh = NULL; 889 handle_t *handle; 890 891 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters)); 892 893 credits = clusters * bpc; 894 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits); 895 if (IS_ERR(handle)) { 896 ret = PTR_ERR(handle); 897 mlog_errno(ret); 898 goto out; 899 } 900 901 while (cpos < clusters) { 902 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, 903 &num_clusters, &xv->xr_list); 904 if (ret) { 905 mlog_errno(ret); 906 goto out_commit; 907 } 908 909 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); 910 911 for (i = 0; i < num_clusters * bpc; i++, blkno++) { 912 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 913 &bh, OCFS2_BH_CACHED, inode); 914 if (ret) { 915 mlog_errno(ret); 916 goto out_commit; 917 } 918 919 ret = ocfs2_journal_access(handle, 920 inode, 921 bh, 922 OCFS2_JOURNAL_ACCESS_WRITE); 923 if (ret < 0) { 924 mlog_errno(ret); 925 goto out_commit; 926 } 927 928 cp_len = value_len > blocksize ? blocksize : value_len; 929 memcpy(bh->b_data, value, cp_len); 930 value_len -= cp_len; 931 value += cp_len; 932 if (cp_len < blocksize) 933 memset(bh->b_data + cp_len, 0, 934 blocksize - cp_len); 935 936 ret = ocfs2_journal_dirty(handle, bh); 937 if (ret < 0) { 938 mlog_errno(ret); 939 goto out_commit; 940 } 941 brelse(bh); 942 bh = NULL; 943 944 /* 945 * XXX: do we need to empty all the following 946 * blocks in this cluster? 947 */ 948 if (!value_len) 949 break; 950 } 951 cpos += num_clusters; 952 } 953 out_commit: 954 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 955 out: 956 brelse(bh); 957 958 return ret; 959 } 960 961 static int ocfs2_xattr_cleanup(struct inode *inode, 962 struct ocfs2_xattr_info *xi, 963 struct ocfs2_xattr_search *xs, 964 size_t offs) 965 { 966 handle_t *handle = NULL; 967 int ret = 0; 968 size_t name_len = strlen(xi->name); 969 void *val = xs->base + offs; 970 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 971 972 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 973 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 974 if (IS_ERR(handle)) { 975 ret = PTR_ERR(handle); 976 mlog_errno(ret); 977 goto out; 978 } 979 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 980 OCFS2_JOURNAL_ACCESS_WRITE); 981 if (ret) { 982 mlog_errno(ret); 983 goto out_commit; 984 } 985 /* Decrease xattr count */ 986 le16_add_cpu(&xs->header->xh_count, -1); 987 /* Remove the xattr entry and tree root which has already be set*/ 988 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry)); 989 memset(val, 0, size); 990 991 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 992 if (ret < 0) 993 mlog_errno(ret); 994 out_commit: 995 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 996 out: 997 return ret; 998 } 999 1000 static int ocfs2_xattr_update_entry(struct inode *inode, 1001 struct ocfs2_xattr_info *xi, 1002 struct ocfs2_xattr_search *xs, 1003 size_t offs) 1004 { 1005 handle_t *handle = NULL; 1006 int ret = 0; 1007 1008 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1009 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1010 if (IS_ERR(handle)) { 1011 ret = PTR_ERR(handle); 1012 mlog_errno(ret); 1013 goto out; 1014 } 1015 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1016 OCFS2_JOURNAL_ACCESS_WRITE); 1017 if (ret) { 1018 mlog_errno(ret); 1019 goto out_commit; 1020 } 1021 1022 xs->here->xe_name_offset = cpu_to_le16(offs); 1023 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1024 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE) 1025 ocfs2_xattr_set_local(xs->here, 1); 1026 else 1027 ocfs2_xattr_set_local(xs->here, 0); 1028 ocfs2_xattr_hash_entry(inode, xs->header, xs->here); 1029 1030 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1031 if (ret < 0) 1032 mlog_errno(ret); 1033 out_commit: 1034 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1035 out: 1036 return ret; 1037 } 1038 1039 /* 1040 * ocfs2_xattr_set_value_outside() 1041 * 1042 * Set large size value in B tree. 1043 */ 1044 static int ocfs2_xattr_set_value_outside(struct inode *inode, 1045 struct ocfs2_xattr_info *xi, 1046 struct ocfs2_xattr_search *xs, 1047 size_t offs) 1048 { 1049 size_t name_len = strlen(xi->name); 1050 void *val = xs->base + offs; 1051 struct ocfs2_xattr_value_root *xv = NULL; 1052 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 1053 int ret = 0; 1054 1055 memset(val, 0, size); 1056 memcpy(val, xi->name, name_len); 1057 xv = (struct ocfs2_xattr_value_root *) 1058 (val + OCFS2_XATTR_SIZE(name_len)); 1059 xv->xr_clusters = 0; 1060 xv->xr_last_eb_blk = 0; 1061 xv->xr_list.l_tree_depth = 0; 1062 xv->xr_list.l_count = cpu_to_le16(1); 1063 xv->xr_list.l_next_free_rec = 0; 1064 1065 ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv, 1066 xi->value_len); 1067 if (ret < 0) { 1068 mlog_errno(ret); 1069 return ret; 1070 } 1071 ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value, 1072 xi->value_len); 1073 if (ret < 0) { 1074 mlog_errno(ret); 1075 return ret; 1076 } 1077 ret = ocfs2_xattr_update_entry(inode, xi, xs, offs); 1078 if (ret < 0) 1079 mlog_errno(ret); 1080 1081 return ret; 1082 } 1083 1084 /* 1085 * ocfs2_xattr_set_entry_local() 1086 * 1087 * Set, replace or remove extended attribute in local. 1088 */ 1089 static void ocfs2_xattr_set_entry_local(struct inode *inode, 1090 struct ocfs2_xattr_info *xi, 1091 struct ocfs2_xattr_search *xs, 1092 struct ocfs2_xattr_entry *last, 1093 size_t min_offs) 1094 { 1095 size_t name_len = strlen(xi->name); 1096 int i; 1097 1098 if (xi->value && xs->not_found) { 1099 /* Insert the new xattr entry. */ 1100 le16_add_cpu(&xs->header->xh_count, 1); 1101 ocfs2_xattr_set_type(last, xi->name_index); 1102 ocfs2_xattr_set_local(last, 1); 1103 last->xe_name_len = name_len; 1104 } else { 1105 void *first_val; 1106 void *val; 1107 size_t offs, size; 1108 1109 first_val = xs->base + min_offs; 1110 offs = le16_to_cpu(xs->here->xe_name_offset); 1111 val = xs->base + offs; 1112 1113 if (le64_to_cpu(xs->here->xe_value_size) > 1114 OCFS2_XATTR_INLINE_SIZE) 1115 size = OCFS2_XATTR_SIZE(name_len) + 1116 OCFS2_XATTR_ROOT_SIZE; 1117 else 1118 size = OCFS2_XATTR_SIZE(name_len) + 1119 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1120 1121 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) + 1122 OCFS2_XATTR_SIZE(xi->value_len)) { 1123 /* The old and the new value have the 1124 same size. Just replace the value. */ 1125 ocfs2_xattr_set_local(xs->here, 1); 1126 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1127 /* Clear value bytes. */ 1128 memset(val + OCFS2_XATTR_SIZE(name_len), 1129 0, 1130 OCFS2_XATTR_SIZE(xi->value_len)); 1131 memcpy(val + OCFS2_XATTR_SIZE(name_len), 1132 xi->value, 1133 xi->value_len); 1134 return; 1135 } 1136 /* Remove the old name+value. */ 1137 memmove(first_val + size, first_val, val - first_val); 1138 memset(first_val, 0, size); 1139 xs->here->xe_name_hash = 0; 1140 xs->here->xe_name_offset = 0; 1141 ocfs2_xattr_set_local(xs->here, 1); 1142 xs->here->xe_value_size = 0; 1143 1144 min_offs += size; 1145 1146 /* Adjust all value offsets. */ 1147 last = xs->header->xh_entries; 1148 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { 1149 size_t o = le16_to_cpu(last->xe_name_offset); 1150 1151 if (o < offs) 1152 last->xe_name_offset = cpu_to_le16(o + size); 1153 last += 1; 1154 } 1155 1156 if (!xi->value) { 1157 /* Remove the old entry. */ 1158 last -= 1; 1159 memmove(xs->here, xs->here + 1, 1160 (void *)last - (void *)xs->here); 1161 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 1162 le16_add_cpu(&xs->header->xh_count, -1); 1163 } 1164 } 1165 if (xi->value) { 1166 /* Insert the new name+value. */ 1167 size_t size = OCFS2_XATTR_SIZE(name_len) + 1168 OCFS2_XATTR_SIZE(xi->value_len); 1169 void *val = xs->base + min_offs - size; 1170 1171 xs->here->xe_name_offset = cpu_to_le16(min_offs - size); 1172 memset(val, 0, size); 1173 memcpy(val, xi->name, name_len); 1174 memcpy(val + OCFS2_XATTR_SIZE(name_len), 1175 xi->value, 1176 xi->value_len); 1177 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1178 ocfs2_xattr_set_local(xs->here, 1); 1179 ocfs2_xattr_hash_entry(inode, xs->header, xs->here); 1180 } 1181 1182 return; 1183 } 1184 1185 /* 1186 * ocfs2_xattr_set_entry() 1187 * 1188 * Set extended attribute entry into inode or block. 1189 * 1190 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE, 1191 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(), 1192 * then set value in B tree with set_value_outside(). 1193 */ 1194 static int ocfs2_xattr_set_entry(struct inode *inode, 1195 struct ocfs2_xattr_info *xi, 1196 struct ocfs2_xattr_search *xs, 1197 int flag) 1198 { 1199 struct ocfs2_xattr_entry *last; 1200 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1201 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1202 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name); 1203 size_t size_l = 0; 1204 handle_t *handle = NULL; 1205 int free, i, ret; 1206 struct ocfs2_xattr_info xi_l = { 1207 .name_index = xi->name_index, 1208 .name = xi->name, 1209 .value = xi->value, 1210 .value_len = xi->value_len, 1211 }; 1212 1213 /* Compute min_offs, last and free space. */ 1214 last = xs->header->xh_entries; 1215 1216 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { 1217 size_t offs = le16_to_cpu(last->xe_name_offset); 1218 if (offs < min_offs) 1219 min_offs = offs; 1220 last += 1; 1221 } 1222 1223 free = min_offs - ((void *)last - xs->base) - sizeof(__u32); 1224 if (free < 0) 1225 return -EFAULT; 1226 1227 if (!xs->not_found) { 1228 size_t size = 0; 1229 if (ocfs2_xattr_is_local(xs->here)) 1230 size = OCFS2_XATTR_SIZE(name_len) + 1231 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1232 else 1233 size = OCFS2_XATTR_SIZE(name_len) + 1234 OCFS2_XATTR_ROOT_SIZE; 1235 free += (size + sizeof(struct ocfs2_xattr_entry)); 1236 } 1237 /* Check free space in inode or block */ 1238 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1239 if (free < sizeof(struct ocfs2_xattr_entry) + 1240 OCFS2_XATTR_SIZE(name_len) + 1241 OCFS2_XATTR_ROOT_SIZE) { 1242 ret = -ENOSPC; 1243 goto out; 1244 } 1245 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 1246 xi_l.value = (void *)&def_xv; 1247 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE; 1248 } else if (xi->value) { 1249 if (free < sizeof(struct ocfs2_xattr_entry) + 1250 OCFS2_XATTR_SIZE(name_len) + 1251 OCFS2_XATTR_SIZE(xi->value_len)) { 1252 ret = -ENOSPC; 1253 goto out; 1254 } 1255 } 1256 1257 if (!xs->not_found) { 1258 /* For existing extended attribute */ 1259 size_t size = OCFS2_XATTR_SIZE(name_len) + 1260 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1261 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1262 void *val = xs->base + offs; 1263 1264 if (ocfs2_xattr_is_local(xs->here) && size == size_l) { 1265 /* Replace existing local xattr with tree root */ 1266 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, 1267 offs); 1268 if (ret < 0) 1269 mlog_errno(ret); 1270 goto out; 1271 } else if (!ocfs2_xattr_is_local(xs->here)) { 1272 /* For existing xattr which has value outside */ 1273 struct ocfs2_xattr_value_root *xv = NULL; 1274 xv = (struct ocfs2_xattr_value_root *)(val + 1275 OCFS2_XATTR_SIZE(name_len)); 1276 1277 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1278 /* 1279 * If new value need set outside also, 1280 * first truncate old value to new value, 1281 * then set new value with set_value_outside(). 1282 */ 1283 ret = ocfs2_xattr_value_truncate(inode, 1284 xs->xattr_bh, 1285 xv, 1286 xi->value_len); 1287 if (ret < 0) { 1288 mlog_errno(ret); 1289 goto out; 1290 } 1291 1292 ret = __ocfs2_xattr_set_value_outside(inode, 1293 xv, 1294 xi->value, 1295 xi->value_len); 1296 if (ret < 0) { 1297 mlog_errno(ret); 1298 goto out; 1299 } 1300 1301 ret = ocfs2_xattr_update_entry(inode, 1302 xi, 1303 xs, 1304 offs); 1305 if (ret < 0) 1306 mlog_errno(ret); 1307 goto out; 1308 } else { 1309 /* 1310 * If new value need set in local, 1311 * just trucate old value to zero. 1312 */ 1313 ret = ocfs2_xattr_value_truncate(inode, 1314 xs->xattr_bh, 1315 xv, 1316 0); 1317 if (ret < 0) 1318 mlog_errno(ret); 1319 } 1320 } 1321 } 1322 1323 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1324 OCFS2_INODE_UPDATE_CREDITS); 1325 if (IS_ERR(handle)) { 1326 ret = PTR_ERR(handle); 1327 mlog_errno(ret); 1328 goto out; 1329 } 1330 1331 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1332 OCFS2_JOURNAL_ACCESS_WRITE); 1333 if (ret) { 1334 mlog_errno(ret); 1335 goto out_commit; 1336 } 1337 1338 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1339 /* set extended attribute in external block. */ 1340 ret = ocfs2_extend_trans(handle, 1341 OCFS2_INODE_UPDATE_CREDITS + 1342 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1343 if (ret) { 1344 mlog_errno(ret); 1345 goto out_commit; 1346 } 1347 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1348 OCFS2_JOURNAL_ACCESS_WRITE); 1349 if (ret) { 1350 mlog_errno(ret); 1351 goto out_commit; 1352 } 1353 } 1354 1355 /* 1356 * Set value in local, include set tree root in local. 1357 * This is the first step for value size >INLINE_SIZE. 1358 */ 1359 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs); 1360 1361 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1362 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1363 if (ret < 0) { 1364 mlog_errno(ret); 1365 goto out_commit; 1366 } 1367 } 1368 1369 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) && 1370 (flag & OCFS2_INLINE_XATTR_FL)) { 1371 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1372 unsigned int xattrsize = osb->s_xattr_inline_size; 1373 1374 /* 1375 * Adjust extent record count or inline data size 1376 * to reserve space for extended attribute. 1377 */ 1378 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1379 struct ocfs2_inline_data *idata = &di->id2.i_data; 1380 le16_add_cpu(&idata->id_count, -xattrsize); 1381 } else if (!(ocfs2_inode_is_fast_symlink(inode))) { 1382 struct ocfs2_extent_list *el = &di->id2.i_list; 1383 le16_add_cpu(&el->l_count, -(xattrsize / 1384 sizeof(struct ocfs2_extent_rec))); 1385 } 1386 di->i_xattr_inline_size = cpu_to_le16(xattrsize); 1387 } 1388 /* Update xattr flag */ 1389 spin_lock(&oi->ip_lock); 1390 oi->ip_dyn_features |= flag; 1391 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1392 spin_unlock(&oi->ip_lock); 1393 /* Update inode ctime */ 1394 inode->i_ctime = CURRENT_TIME; 1395 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); 1396 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 1397 1398 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1399 if (ret < 0) 1400 mlog_errno(ret); 1401 1402 out_commit: 1403 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1404 1405 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1406 /* 1407 * Set value outside in B tree. 1408 * This is the second step for value size > INLINE_SIZE. 1409 */ 1410 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1411 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs); 1412 if (ret < 0) { 1413 int ret2; 1414 1415 mlog_errno(ret); 1416 /* 1417 * If set value outside failed, we have to clean 1418 * the junk tree root we have already set in local. 1419 */ 1420 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs); 1421 if (ret2 < 0) 1422 mlog_errno(ret2); 1423 } 1424 } 1425 out: 1426 return ret; 1427 1428 } 1429 1430 static int ocfs2_remove_value_outside(struct inode*inode, 1431 struct buffer_head *bh, 1432 struct ocfs2_xattr_header *header) 1433 { 1434 int ret = 0, i; 1435 1436 for (i = 0; i < le16_to_cpu(header->xh_count); i++) { 1437 struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; 1438 1439 if (!ocfs2_xattr_is_local(entry)) { 1440 struct ocfs2_xattr_value_root *xv; 1441 void *val; 1442 1443 val = (void *)header + 1444 le16_to_cpu(entry->xe_name_offset); 1445 xv = (struct ocfs2_xattr_value_root *) 1446 (val + OCFS2_XATTR_SIZE(entry->xe_name_len)); 1447 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0); 1448 if (ret < 0) { 1449 mlog_errno(ret); 1450 return ret; 1451 } 1452 } 1453 } 1454 1455 return ret; 1456 } 1457 1458 static int ocfs2_xattr_ibody_remove(struct inode *inode, 1459 struct buffer_head *di_bh) 1460 { 1461 1462 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1463 struct ocfs2_xattr_header *header; 1464 int ret; 1465 1466 header = (struct ocfs2_xattr_header *) 1467 ((void *)di + inode->i_sb->s_blocksize - 1468 le16_to_cpu(di->i_xattr_inline_size)); 1469 1470 ret = ocfs2_remove_value_outside(inode, di_bh, header); 1471 1472 return ret; 1473 } 1474 1475 static int ocfs2_xattr_block_remove(struct inode *inode, 1476 struct buffer_head *blk_bh) 1477 { 1478 struct ocfs2_xattr_block *xb; 1479 int ret = 0; 1480 1481 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1482 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1483 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header); 1484 ret = ocfs2_remove_value_outside(inode, blk_bh, header); 1485 } else 1486 ret = ocfs2_delete_xattr_index_block(inode, blk_bh); 1487 1488 return ret; 1489 } 1490 1491 static int ocfs2_xattr_free_block(struct inode *inode, 1492 u64 block) 1493 { 1494 struct inode *xb_alloc_inode; 1495 struct buffer_head *xb_alloc_bh = NULL; 1496 struct buffer_head *blk_bh = NULL; 1497 struct ocfs2_xattr_block *xb; 1498 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1499 handle_t *handle; 1500 int ret = 0; 1501 u64 blk, bg_blkno; 1502 u16 bit; 1503 1504 ret = ocfs2_read_block(osb, block, &blk_bh, 1505 OCFS2_BH_CACHED, inode); 1506 if (ret < 0) { 1507 mlog_errno(ret); 1508 goto out; 1509 } 1510 1511 /*Verify the signature of xattr block*/ 1512 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 1513 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 1514 ret = -EFAULT; 1515 goto out; 1516 } 1517 1518 ret = ocfs2_xattr_block_remove(inode, blk_bh); 1519 if (ret < 0) { 1520 mlog_errno(ret); 1521 goto out; 1522 } 1523 1524 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1525 blk = le64_to_cpu(xb->xb_blkno); 1526 bit = le16_to_cpu(xb->xb_suballoc_bit); 1527 bg_blkno = ocfs2_which_suballoc_group(blk, bit); 1528 1529 xb_alloc_inode = ocfs2_get_system_file_inode(osb, 1530 EXTENT_ALLOC_SYSTEM_INODE, 1531 le16_to_cpu(xb->xb_suballoc_slot)); 1532 if (!xb_alloc_inode) { 1533 ret = -ENOMEM; 1534 mlog_errno(ret); 1535 goto out; 1536 } 1537 mutex_lock(&xb_alloc_inode->i_mutex); 1538 1539 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1); 1540 if (ret < 0) { 1541 mlog_errno(ret); 1542 goto out_mutex; 1543 } 1544 1545 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE); 1546 if (IS_ERR(handle)) { 1547 ret = PTR_ERR(handle); 1548 mlog_errno(ret); 1549 goto out_unlock; 1550 } 1551 1552 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh, 1553 bit, bg_blkno, 1); 1554 if (ret < 0) 1555 mlog_errno(ret); 1556 1557 ocfs2_commit_trans(osb, handle); 1558 out_unlock: 1559 ocfs2_inode_unlock(xb_alloc_inode, 1); 1560 brelse(xb_alloc_bh); 1561 out_mutex: 1562 mutex_unlock(&xb_alloc_inode->i_mutex); 1563 iput(xb_alloc_inode); 1564 out: 1565 brelse(blk_bh); 1566 return ret; 1567 } 1568 1569 /* 1570 * ocfs2_xattr_remove() 1571 * 1572 * Free extended attribute resources associated with this inode. 1573 */ 1574 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh) 1575 { 1576 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1577 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1578 handle_t *handle; 1579 int ret; 1580 1581 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 1582 return 0; 1583 1584 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 1585 return 0; 1586 1587 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1588 ret = ocfs2_xattr_ibody_remove(inode, di_bh); 1589 if (ret < 0) { 1590 mlog_errno(ret); 1591 goto out; 1592 } 1593 } 1594 1595 if (di->i_xattr_loc) { 1596 ret = ocfs2_xattr_free_block(inode, 1597 le64_to_cpu(di->i_xattr_loc)); 1598 if (ret < 0) { 1599 mlog_errno(ret); 1600 goto out; 1601 } 1602 } 1603 1604 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1605 OCFS2_INODE_UPDATE_CREDITS); 1606 if (IS_ERR(handle)) { 1607 ret = PTR_ERR(handle); 1608 mlog_errno(ret); 1609 goto out; 1610 } 1611 ret = ocfs2_journal_access(handle, inode, di_bh, 1612 OCFS2_JOURNAL_ACCESS_WRITE); 1613 if (ret) { 1614 mlog_errno(ret); 1615 goto out_commit; 1616 } 1617 1618 di->i_xattr_loc = 0; 1619 1620 spin_lock(&oi->ip_lock); 1621 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL); 1622 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1623 spin_unlock(&oi->ip_lock); 1624 1625 ret = ocfs2_journal_dirty(handle, di_bh); 1626 if (ret < 0) 1627 mlog_errno(ret); 1628 out_commit: 1629 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1630 out: 1631 return ret; 1632 } 1633 1634 static int ocfs2_xattr_has_space_inline(struct inode *inode, 1635 struct ocfs2_dinode *di) 1636 { 1637 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1638 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size; 1639 int free; 1640 1641 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE) 1642 return 0; 1643 1644 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1645 struct ocfs2_inline_data *idata = &di->id2.i_data; 1646 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size); 1647 } else if (ocfs2_inode_is_fast_symlink(inode)) { 1648 free = ocfs2_fast_symlink_chars(inode->i_sb) - 1649 le64_to_cpu(di->i_size); 1650 } else { 1651 struct ocfs2_extent_list *el = &di->id2.i_list; 1652 free = (le16_to_cpu(el->l_count) - 1653 le16_to_cpu(el->l_next_free_rec)) * 1654 sizeof(struct ocfs2_extent_rec); 1655 } 1656 if (free >= xattrsize) 1657 return 1; 1658 1659 return 0; 1660 } 1661 1662 /* 1663 * ocfs2_xattr_ibody_find() 1664 * 1665 * Find extended attribute in inode block and 1666 * fill search info into struct ocfs2_xattr_search. 1667 */ 1668 static int ocfs2_xattr_ibody_find(struct inode *inode, 1669 int name_index, 1670 const char *name, 1671 struct ocfs2_xattr_search *xs) 1672 { 1673 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1674 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1675 int ret; 1676 int has_space = 0; 1677 1678 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1679 return 0; 1680 1681 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1682 down_read(&oi->ip_alloc_sem); 1683 has_space = ocfs2_xattr_has_space_inline(inode, di); 1684 up_read(&oi->ip_alloc_sem); 1685 if (!has_space) 1686 return 0; 1687 } 1688 1689 xs->xattr_bh = xs->inode_bh; 1690 xs->end = (void *)di + inode->i_sb->s_blocksize; 1691 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) 1692 xs->header = (struct ocfs2_xattr_header *) 1693 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 1694 else 1695 xs->header = (struct ocfs2_xattr_header *) 1696 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size); 1697 xs->base = (void *)xs->header; 1698 xs->here = xs->header->xh_entries; 1699 1700 /* Find the named attribute. */ 1701 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1702 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1703 if (ret && ret != -ENODATA) 1704 return ret; 1705 xs->not_found = ret; 1706 } 1707 1708 return 0; 1709 } 1710 1711 /* 1712 * ocfs2_xattr_ibody_set() 1713 * 1714 * Set, replace or remove an extended attribute into inode block. 1715 * 1716 */ 1717 static int ocfs2_xattr_ibody_set(struct inode *inode, 1718 struct ocfs2_xattr_info *xi, 1719 struct ocfs2_xattr_search *xs) 1720 { 1721 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1722 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1723 int ret; 1724 1725 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1726 return -ENOSPC; 1727 1728 down_write(&oi->ip_alloc_sem); 1729 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1730 if (!ocfs2_xattr_has_space_inline(inode, di)) { 1731 ret = -ENOSPC; 1732 goto out; 1733 } 1734 } 1735 1736 ret = ocfs2_xattr_set_entry(inode, xi, xs, 1737 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL)); 1738 out: 1739 up_write(&oi->ip_alloc_sem); 1740 1741 return ret; 1742 } 1743 1744 /* 1745 * ocfs2_xattr_block_find() 1746 * 1747 * Find extended attribute in external block and 1748 * fill search info into struct ocfs2_xattr_search. 1749 */ 1750 static int ocfs2_xattr_block_find(struct inode *inode, 1751 int name_index, 1752 const char *name, 1753 struct ocfs2_xattr_search *xs) 1754 { 1755 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1756 struct buffer_head *blk_bh = NULL; 1757 struct ocfs2_xattr_block *xb; 1758 int ret = 0; 1759 1760 if (!di->i_xattr_loc) 1761 return ret; 1762 1763 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1764 le64_to_cpu(di->i_xattr_loc), 1765 &blk_bh, OCFS2_BH_CACHED, inode); 1766 if (ret < 0) { 1767 mlog_errno(ret); 1768 return ret; 1769 } 1770 /*Verify the signature of xattr block*/ 1771 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 1772 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 1773 ret = -EFAULT; 1774 goto cleanup; 1775 } 1776 1777 xs->xattr_bh = blk_bh; 1778 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1779 1780 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1781 xs->header = &xb->xb_attrs.xb_header; 1782 xs->base = (void *)xs->header; 1783 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 1784 xs->here = xs->header->xh_entries; 1785 1786 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1787 } else 1788 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 1789 name_index, 1790 name, xs); 1791 1792 if (ret && ret != -ENODATA) { 1793 xs->xattr_bh = NULL; 1794 goto cleanup; 1795 } 1796 xs->not_found = ret; 1797 return 0; 1798 cleanup: 1799 brelse(blk_bh); 1800 1801 return ret; 1802 } 1803 1804 /* 1805 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree 1806 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header 1807 * re-initialized. 1808 */ 1809 static int ocfs2_restore_xattr_block(struct inode *inode, 1810 struct ocfs2_xattr_search *xs) 1811 { 1812 int ret; 1813 handle_t *handle; 1814 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1815 struct ocfs2_xattr_block *xb = 1816 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1817 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 1818 u16 xb_flags = le16_to_cpu(xb->xb_flags); 1819 1820 BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) || 1821 le16_to_cpu(el->l_next_free_rec) != 0); 1822 1823 handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1824 if (IS_ERR(handle)) { 1825 ret = PTR_ERR(handle); 1826 handle = NULL; 1827 goto out; 1828 } 1829 1830 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1831 OCFS2_JOURNAL_ACCESS_WRITE); 1832 if (ret < 0) { 1833 mlog_errno(ret); 1834 goto out_commit; 1835 } 1836 1837 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 1838 offsetof(struct ocfs2_xattr_block, xb_attrs)); 1839 1840 xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED); 1841 1842 ocfs2_journal_dirty(handle, xs->xattr_bh); 1843 1844 out_commit: 1845 ocfs2_commit_trans(osb, handle); 1846 out: 1847 return ret; 1848 } 1849 1850 /* 1851 * ocfs2_xattr_block_set() 1852 * 1853 * Set, replace or remove an extended attribute into external block. 1854 * 1855 */ 1856 static int ocfs2_xattr_block_set(struct inode *inode, 1857 struct ocfs2_xattr_info *xi, 1858 struct ocfs2_xattr_search *xs) 1859 { 1860 struct buffer_head *new_bh = NULL; 1861 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1862 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1863 struct ocfs2_alloc_context *meta_ac = NULL; 1864 handle_t *handle = NULL; 1865 struct ocfs2_xattr_block *xblk = NULL; 1866 u16 suballoc_bit_start; 1867 u32 num_got; 1868 u64 first_blkno; 1869 int ret; 1870 1871 if (!xs->xattr_bh) { 1872 /* 1873 * Alloc one external block for extended attribute 1874 * outside of inode. 1875 */ 1876 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); 1877 if (ret < 0) { 1878 mlog_errno(ret); 1879 goto out; 1880 } 1881 handle = ocfs2_start_trans(osb, 1882 OCFS2_XATTR_BLOCK_CREATE_CREDITS); 1883 if (IS_ERR(handle)) { 1884 ret = PTR_ERR(handle); 1885 mlog_errno(ret); 1886 goto out; 1887 } 1888 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1889 OCFS2_JOURNAL_ACCESS_CREATE); 1890 if (ret < 0) { 1891 mlog_errno(ret); 1892 goto out_commit; 1893 } 1894 1895 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, 1896 &suballoc_bit_start, &num_got, 1897 &first_blkno); 1898 if (ret < 0) { 1899 mlog_errno(ret); 1900 goto out_commit; 1901 } 1902 1903 new_bh = sb_getblk(inode->i_sb, first_blkno); 1904 ocfs2_set_new_buffer_uptodate(inode, new_bh); 1905 1906 ret = ocfs2_journal_access(handle, inode, new_bh, 1907 OCFS2_JOURNAL_ACCESS_CREATE); 1908 if (ret < 0) { 1909 mlog_errno(ret); 1910 goto out_commit; 1911 } 1912 1913 /* Initialize ocfs2_xattr_block */ 1914 xs->xattr_bh = new_bh; 1915 xblk = (struct ocfs2_xattr_block *)new_bh->b_data; 1916 memset(xblk, 0, inode->i_sb->s_blocksize); 1917 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE); 1918 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num); 1919 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start); 1920 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation); 1921 xblk->xb_blkno = cpu_to_le64(first_blkno); 1922 1923 xs->header = &xblk->xb_attrs.xb_header; 1924 xs->base = (void *)xs->header; 1925 xs->end = (void *)xblk + inode->i_sb->s_blocksize; 1926 xs->here = xs->header->xh_entries; 1927 1928 1929 ret = ocfs2_journal_dirty(handle, new_bh); 1930 if (ret < 0) { 1931 mlog_errno(ret); 1932 goto out_commit; 1933 } 1934 di->i_xattr_loc = cpu_to_le64(first_blkno); 1935 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1936 if (ret < 0) 1937 mlog_errno(ret); 1938 out_commit: 1939 ocfs2_commit_trans(osb, handle); 1940 out: 1941 if (meta_ac) 1942 ocfs2_free_alloc_context(meta_ac); 1943 if (ret < 0) 1944 return ret; 1945 } else 1946 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1947 1948 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) { 1949 /* Set extended attribute into external block */ 1950 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL); 1951 if (!ret || ret != -ENOSPC) 1952 goto end; 1953 1954 ret = ocfs2_xattr_create_index_block(inode, xs); 1955 if (ret) 1956 goto end; 1957 } 1958 1959 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs); 1960 if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0) 1961 ret = ocfs2_restore_xattr_block(inode, xs); 1962 1963 end: 1964 1965 return ret; 1966 } 1967 1968 /* 1969 * ocfs2_xattr_set() 1970 * 1971 * Set, replace or remove an extended attribute for this inode. 1972 * value is NULL to remove an existing extended attribute, else either 1973 * create or replace an extended attribute. 1974 */ 1975 int ocfs2_xattr_set(struct inode *inode, 1976 int name_index, 1977 const char *name, 1978 const void *value, 1979 size_t value_len, 1980 int flags) 1981 { 1982 struct buffer_head *di_bh = NULL; 1983 struct ocfs2_dinode *di; 1984 int ret; 1985 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 1986 1987 struct ocfs2_xattr_info xi = { 1988 .name_index = name_index, 1989 .name = name, 1990 .value = value, 1991 .value_len = value_len, 1992 }; 1993 1994 struct ocfs2_xattr_search xis = { 1995 .not_found = -ENODATA, 1996 }; 1997 1998 struct ocfs2_xattr_search xbs = { 1999 .not_found = -ENODATA, 2000 }; 2001 2002 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 2003 return -EOPNOTSUPP; 2004 2005 ret = ocfs2_inode_lock(inode, &di_bh, 1); 2006 if (ret < 0) { 2007 mlog_errno(ret); 2008 return ret; 2009 } 2010 xis.inode_bh = xbs.inode_bh = di_bh; 2011 di = (struct ocfs2_dinode *)di_bh->b_data; 2012 2013 down_write(&OCFS2_I(inode)->ip_xattr_sem); 2014 /* 2015 * Scan inode and external block to find the same name 2016 * extended attribute and collect search infomation. 2017 */ 2018 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis); 2019 if (ret) 2020 goto cleanup; 2021 if (xis.not_found) { 2022 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs); 2023 if (ret) 2024 goto cleanup; 2025 } 2026 2027 if (xis.not_found && xbs.not_found) { 2028 ret = -ENODATA; 2029 if (flags & XATTR_REPLACE) 2030 goto cleanup; 2031 ret = 0; 2032 if (!value) 2033 goto cleanup; 2034 } else { 2035 ret = -EEXIST; 2036 if (flags & XATTR_CREATE) 2037 goto cleanup; 2038 } 2039 2040 if (!value) { 2041 /* Remove existing extended attribute */ 2042 if (!xis.not_found) 2043 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2044 else if (!xbs.not_found) 2045 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2046 } else { 2047 /* We always try to set extended attribute into inode first*/ 2048 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2049 if (!ret && !xbs.not_found) { 2050 /* 2051 * If succeed and that extended attribute existing in 2052 * external block, then we will remove it. 2053 */ 2054 xi.value = NULL; 2055 xi.value_len = 0; 2056 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2057 } else if (ret == -ENOSPC) { 2058 if (di->i_xattr_loc && !xbs.xattr_bh) { 2059 ret = ocfs2_xattr_block_find(inode, name_index, 2060 name, &xbs); 2061 if (ret) 2062 goto cleanup; 2063 } 2064 /* 2065 * If no space in inode, we will set extended attribute 2066 * into external block. 2067 */ 2068 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2069 if (ret) 2070 goto cleanup; 2071 if (!xis.not_found) { 2072 /* 2073 * If succeed and that extended attribute 2074 * existing in inode, we will remove it. 2075 */ 2076 xi.value = NULL; 2077 xi.value_len = 0; 2078 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2079 } 2080 } 2081 } 2082 cleanup: 2083 up_write(&OCFS2_I(inode)->ip_xattr_sem); 2084 ocfs2_inode_unlock(inode, 1); 2085 brelse(di_bh); 2086 brelse(xbs.xattr_bh); 2087 for (i = 0; i < blk_per_bucket; i++) 2088 brelse(xbs.bucket.bhs[i]); 2089 2090 return ret; 2091 } 2092 2093 static inline u32 ocfs2_xattr_hash_by_name(struct inode *inode, 2094 int name_index, 2095 const char *suffix_name) 2096 { 2097 struct xattr_handler *handler = ocfs2_xattr_handler(name_index); 2098 char *prefix = handler->prefix; 2099 int prefix_len = strlen(handler->prefix); 2100 2101 return ocfs2_xattr_name_hash(inode, prefix, prefix_len, 2102 (char *)suffix_name, strlen(suffix_name)); 2103 } 2104 2105 /* 2106 * Find the xattr extent rec which may contains name_hash. 2107 * e_cpos will be the first name hash of the xattr rec. 2108 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list. 2109 */ 2110 static int ocfs2_xattr_get_rec(struct inode *inode, 2111 u32 name_hash, 2112 u64 *p_blkno, 2113 u32 *e_cpos, 2114 u32 *num_clusters, 2115 struct ocfs2_extent_list *el) 2116 { 2117 int ret = 0, i; 2118 struct buffer_head *eb_bh = NULL; 2119 struct ocfs2_extent_block *eb; 2120 struct ocfs2_extent_rec *rec = NULL; 2121 u64 e_blkno = 0; 2122 2123 if (el->l_tree_depth) { 2124 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh); 2125 if (ret) { 2126 mlog_errno(ret); 2127 goto out; 2128 } 2129 2130 eb = (struct ocfs2_extent_block *) eb_bh->b_data; 2131 el = &eb->h_list; 2132 2133 if (el->l_tree_depth) { 2134 ocfs2_error(inode->i_sb, 2135 "Inode %lu has non zero tree depth in " 2136 "xattr tree block %llu\n", inode->i_ino, 2137 (unsigned long long)eb_bh->b_blocknr); 2138 ret = -EROFS; 2139 goto out; 2140 } 2141 } 2142 2143 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { 2144 rec = &el->l_recs[i]; 2145 2146 if (le32_to_cpu(rec->e_cpos) <= name_hash) { 2147 e_blkno = le64_to_cpu(rec->e_blkno); 2148 break; 2149 } 2150 } 2151 2152 if (!e_blkno) { 2153 ocfs2_error(inode->i_sb, "Inode %lu has bad extent " 2154 "record (%u, %u, 0) in xattr", inode->i_ino, 2155 le32_to_cpu(rec->e_cpos), 2156 ocfs2_rec_clusters(el, rec)); 2157 ret = -EROFS; 2158 goto out; 2159 } 2160 2161 *p_blkno = le64_to_cpu(rec->e_blkno); 2162 *num_clusters = le16_to_cpu(rec->e_leaf_clusters); 2163 if (e_cpos) 2164 *e_cpos = le32_to_cpu(rec->e_cpos); 2165 out: 2166 brelse(eb_bh); 2167 return ret; 2168 } 2169 2170 typedef int (xattr_bucket_func)(struct inode *inode, 2171 struct ocfs2_xattr_bucket *bucket, 2172 void *para); 2173 2174 static int ocfs2_find_xe_in_bucket(struct inode *inode, 2175 struct buffer_head *header_bh, 2176 int name_index, 2177 const char *name, 2178 u32 name_hash, 2179 u16 *xe_index, 2180 int *found) 2181 { 2182 int i, ret = 0, cmp = 1, block_off, new_offset; 2183 struct ocfs2_xattr_header *xh = 2184 (struct ocfs2_xattr_header *)header_bh->b_data; 2185 size_t name_len = strlen(name); 2186 struct ocfs2_xattr_entry *xe = NULL; 2187 struct buffer_head *name_bh = NULL; 2188 char *xe_name; 2189 2190 /* 2191 * We don't use binary search in the bucket because there 2192 * may be multiple entries with the same name hash. 2193 */ 2194 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 2195 xe = &xh->xh_entries[i]; 2196 2197 if (name_hash > le32_to_cpu(xe->xe_name_hash)) 2198 continue; 2199 else if (name_hash < le32_to_cpu(xe->xe_name_hash)) 2200 break; 2201 2202 cmp = name_index - ocfs2_xattr_get_type(xe); 2203 if (!cmp) 2204 cmp = name_len - xe->xe_name_len; 2205 if (cmp) 2206 continue; 2207 2208 ret = ocfs2_xattr_bucket_get_name_value(inode, 2209 xh, 2210 i, 2211 &block_off, 2212 &new_offset); 2213 if (ret) { 2214 mlog_errno(ret); 2215 break; 2216 } 2217 2218 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 2219 header_bh->b_blocknr + block_off, 2220 &name_bh, OCFS2_BH_CACHED, inode); 2221 if (ret) { 2222 mlog_errno(ret); 2223 break; 2224 } 2225 xe_name = name_bh->b_data + new_offset; 2226 2227 cmp = memcmp(name, xe_name, name_len); 2228 brelse(name_bh); 2229 name_bh = NULL; 2230 2231 if (cmp == 0) { 2232 *xe_index = i; 2233 *found = 1; 2234 ret = 0; 2235 break; 2236 } 2237 } 2238 2239 return ret; 2240 } 2241 2242 /* 2243 * Find the specified xattr entry in a series of buckets. 2244 * This series start from p_blkno and last for num_clusters. 2245 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains 2246 * the num of the valid buckets. 2247 * 2248 * Return the buffer_head this xattr should reside in. And if the xattr's 2249 * hash is in the gap of 2 buckets, return the lower bucket. 2250 */ 2251 static int ocfs2_xattr_bucket_find(struct inode *inode, 2252 int name_index, 2253 const char *name, 2254 u32 name_hash, 2255 u64 p_blkno, 2256 u32 first_hash, 2257 u32 num_clusters, 2258 struct ocfs2_xattr_search *xs) 2259 { 2260 int ret, found = 0; 2261 struct buffer_head *bh = NULL; 2262 struct buffer_head *lower_bh = NULL; 2263 struct ocfs2_xattr_header *xh = NULL; 2264 struct ocfs2_xattr_entry *xe = NULL; 2265 u16 index = 0; 2266 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2267 int low_bucket = 0, bucket, high_bucket; 2268 u32 last_hash; 2269 u64 blkno; 2270 2271 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, 2272 &bh, OCFS2_BH_CACHED, inode); 2273 if (ret) { 2274 mlog_errno(ret); 2275 goto out; 2276 } 2277 2278 xh = (struct ocfs2_xattr_header *)bh->b_data; 2279 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1; 2280 2281 while (low_bucket <= high_bucket) { 2282 brelse(bh); 2283 bh = NULL; 2284 bucket = (low_bucket + high_bucket) / 2; 2285 2286 blkno = p_blkno + bucket * blk_per_bucket; 2287 2288 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 2289 &bh, OCFS2_BH_CACHED, inode); 2290 if (ret) { 2291 mlog_errno(ret); 2292 goto out; 2293 } 2294 2295 xh = (struct ocfs2_xattr_header *)bh->b_data; 2296 xe = &xh->xh_entries[0]; 2297 if (name_hash < le32_to_cpu(xe->xe_name_hash)) { 2298 high_bucket = bucket - 1; 2299 continue; 2300 } 2301 2302 /* 2303 * Check whether the hash of the last entry in our 2304 * bucket is larger than the search one. 2305 */ 2306 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1]; 2307 last_hash = le32_to_cpu(xe->xe_name_hash); 2308 2309 /* record lower_bh which may be the insert place. */ 2310 brelse(lower_bh); 2311 lower_bh = bh; 2312 bh = NULL; 2313 2314 if (name_hash > le32_to_cpu(xe->xe_name_hash)) { 2315 low_bucket = bucket + 1; 2316 continue; 2317 } 2318 2319 /* the searched xattr should reside in this bucket if exists. */ 2320 ret = ocfs2_find_xe_in_bucket(inode, lower_bh, 2321 name_index, name, name_hash, 2322 &index, &found); 2323 if (ret) { 2324 mlog_errno(ret); 2325 goto out; 2326 } 2327 break; 2328 } 2329 2330 /* 2331 * Record the bucket we have found. 2332 * When the xattr's hash value is in the gap of 2 buckets, we will 2333 * always set it to the previous bucket. 2334 */ 2335 if (!lower_bh) { 2336 /* 2337 * We can't find any bucket whose first name_hash is less 2338 * than the find name_hash. 2339 */ 2340 BUG_ON(bh->b_blocknr != p_blkno); 2341 lower_bh = bh; 2342 bh = NULL; 2343 } 2344 xs->bucket.bhs[0] = lower_bh; 2345 xs->bucket.xh = (struct ocfs2_xattr_header *) 2346 xs->bucket.bhs[0]->b_data; 2347 lower_bh = NULL; 2348 2349 xs->header = xs->bucket.xh; 2350 xs->base = xs->bucket.bhs[0]->b_data; 2351 xs->end = xs->base + inode->i_sb->s_blocksize; 2352 2353 if (found) { 2354 /* 2355 * If we have found the xattr enty, read all the blocks in 2356 * this bucket. 2357 */ 2358 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2359 xs->bucket.bhs[0]->b_blocknr + 1, 2360 blk_per_bucket - 1, &xs->bucket.bhs[1], 2361 OCFS2_BH_CACHED, inode); 2362 if (ret) { 2363 mlog_errno(ret); 2364 goto out; 2365 } 2366 2367 xs->here = &xs->header->xh_entries[index]; 2368 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name, 2369 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index); 2370 } else 2371 ret = -ENODATA; 2372 2373 out: 2374 brelse(bh); 2375 brelse(lower_bh); 2376 return ret; 2377 } 2378 2379 static int ocfs2_xattr_index_block_find(struct inode *inode, 2380 struct buffer_head *root_bh, 2381 int name_index, 2382 const char *name, 2383 struct ocfs2_xattr_search *xs) 2384 { 2385 int ret; 2386 struct ocfs2_xattr_block *xb = 2387 (struct ocfs2_xattr_block *)root_bh->b_data; 2388 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 2389 struct ocfs2_extent_list *el = &xb_root->xt_list; 2390 u64 p_blkno = 0; 2391 u32 first_hash, num_clusters = 0; 2392 u32 name_hash = ocfs2_xattr_hash_by_name(inode, name_index, name); 2393 2394 if (le16_to_cpu(el->l_next_free_rec) == 0) 2395 return -ENODATA; 2396 2397 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n", 2398 name, name_hash, name_index); 2399 2400 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash, 2401 &num_clusters, el); 2402 if (ret) { 2403 mlog_errno(ret); 2404 goto out; 2405 } 2406 2407 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash); 2408 2409 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash " 2410 "in the rec is %u\n", num_clusters, p_blkno, first_hash); 2411 2412 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash, 2413 p_blkno, first_hash, num_clusters, xs); 2414 2415 out: 2416 return ret; 2417 } 2418 2419 static int ocfs2_iterate_xattr_buckets(struct inode *inode, 2420 u64 blkno, 2421 u32 clusters, 2422 xattr_bucket_func *func, 2423 void *para) 2424 { 2425 int i, j, ret = 0; 2426 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2427 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)); 2428 u32 num_buckets = clusters * bpc; 2429 struct ocfs2_xattr_bucket bucket; 2430 2431 memset(&bucket, 0, sizeof(bucket)); 2432 2433 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n", 2434 clusters, blkno); 2435 2436 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) { 2437 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2438 blkno, blk_per_bucket, 2439 bucket.bhs, OCFS2_BH_CACHED, inode); 2440 if (ret) { 2441 mlog_errno(ret); 2442 goto out; 2443 } 2444 2445 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data; 2446 /* 2447 * The real bucket num in this series of blocks is stored 2448 * in the 1st bucket. 2449 */ 2450 if (i == 0) 2451 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets); 2452 2453 mlog(0, "iterating xattr bucket %llu\n", blkno); 2454 if (func) { 2455 ret = func(inode, &bucket, para); 2456 if (ret) { 2457 mlog_errno(ret); 2458 break; 2459 } 2460 } 2461 2462 for (j = 0; j < blk_per_bucket; j++) 2463 brelse(bucket.bhs[j]); 2464 memset(&bucket, 0, sizeof(bucket)); 2465 } 2466 2467 out: 2468 for (j = 0; j < blk_per_bucket; j++) 2469 brelse(bucket.bhs[j]); 2470 2471 return ret; 2472 } 2473 2474 struct ocfs2_xattr_tree_list { 2475 char *buffer; 2476 size_t buffer_size; 2477 }; 2478 2479 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, 2480 struct ocfs2_xattr_header *xh, 2481 int index, 2482 int *block_off, 2483 int *new_offset) 2484 { 2485 u16 name_offset; 2486 2487 if (index < 0 || index >= le16_to_cpu(xh->xh_count)) 2488 return -EINVAL; 2489 2490 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset); 2491 2492 *block_off = name_offset >> inode->i_sb->s_blocksize_bits; 2493 *new_offset = name_offset % inode->i_sb->s_blocksize; 2494 2495 return 0; 2496 } 2497 2498 static int ocfs2_list_xattr_bucket(struct inode *inode, 2499 struct ocfs2_xattr_bucket *bucket, 2500 void *para) 2501 { 2502 int ret = 0; 2503 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para; 2504 size_t size; 2505 int i, block_off, new_offset; 2506 2507 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) { 2508 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i]; 2509 struct xattr_handler *handler = 2510 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); 2511 2512 if (handler) { 2513 ret = ocfs2_xattr_bucket_get_name_value(inode, 2514 bucket->xh, 2515 i, 2516 &block_off, 2517 &new_offset); 2518 if (ret) 2519 break; 2520 size = handler->list(inode, xl->buffer, xl->buffer_size, 2521 bucket->bhs[block_off]->b_data + 2522 new_offset, 2523 entry->xe_name_len); 2524 if (xl->buffer) { 2525 if (size > xl->buffer_size) 2526 return -ERANGE; 2527 xl->buffer += size; 2528 } 2529 xl->buffer_size -= size; 2530 } 2531 } 2532 2533 return ret; 2534 } 2535 2536 static int ocfs2_xattr_tree_list_index_block(struct inode *inode, 2537 struct ocfs2_xattr_tree_root *xt, 2538 char *buffer, 2539 size_t buffer_size) 2540 { 2541 struct ocfs2_extent_list *el = &xt->xt_list; 2542 int ret = 0; 2543 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0; 2544 u64 p_blkno = 0; 2545 struct ocfs2_xattr_tree_list xl = { 2546 .buffer = buffer, 2547 .buffer_size = buffer_size, 2548 }; 2549 2550 if (le16_to_cpu(el->l_next_free_rec) == 0) 2551 return 0; 2552 2553 while (name_hash > 0) { 2554 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 2555 &e_cpos, &num_clusters, el); 2556 if (ret) { 2557 mlog_errno(ret); 2558 goto out; 2559 } 2560 2561 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 2562 ocfs2_list_xattr_bucket, 2563 &xl); 2564 if (ret) { 2565 mlog_errno(ret); 2566 goto out; 2567 } 2568 2569 if (e_cpos == 0) 2570 break; 2571 2572 name_hash = e_cpos - 1; 2573 } 2574 2575 ret = buffer_size - xl.buffer_size; 2576 out: 2577 return ret; 2578 } 2579 2580 static int cmp_xe(const void *a, const void *b) 2581 { 2582 const struct ocfs2_xattr_entry *l = a, *r = b; 2583 u32 l_hash = le32_to_cpu(l->xe_name_hash); 2584 u32 r_hash = le32_to_cpu(r->xe_name_hash); 2585 2586 if (l_hash > r_hash) 2587 return 1; 2588 if (l_hash < r_hash) 2589 return -1; 2590 return 0; 2591 } 2592 2593 static void swap_xe(void *a, void *b, int size) 2594 { 2595 struct ocfs2_xattr_entry *l = a, *r = b, tmp; 2596 2597 tmp = *l; 2598 memcpy(l, r, sizeof(struct ocfs2_xattr_entry)); 2599 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry)); 2600 } 2601 2602 /* 2603 * When the ocfs2_xattr_block is filled up, new bucket will be created 2604 * and all the xattr entries will be moved to the new bucket. 2605 * Note: we need to sort the entries since they are not saved in order 2606 * in the ocfs2_xattr_block. 2607 */ 2608 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode, 2609 struct buffer_head *xb_bh, 2610 struct buffer_head *xh_bh, 2611 struct buffer_head *data_bh) 2612 { 2613 int i, blocksize = inode->i_sb->s_blocksize; 2614 u16 offset, size, off_change; 2615 struct ocfs2_xattr_entry *xe; 2616 struct ocfs2_xattr_block *xb = 2617 (struct ocfs2_xattr_block *)xb_bh->b_data; 2618 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header; 2619 struct ocfs2_xattr_header *xh = 2620 (struct ocfs2_xattr_header *)xh_bh->b_data; 2621 u16 count = le16_to_cpu(xb_xh->xh_count); 2622 char *target = xh_bh->b_data, *src = xb_bh->b_data; 2623 2624 mlog(0, "cp xattr from block %llu to bucket %llu\n", 2625 (unsigned long long)xb_bh->b_blocknr, 2626 (unsigned long long)xh_bh->b_blocknr); 2627 2628 memset(xh_bh->b_data, 0, blocksize); 2629 if (data_bh) 2630 memset(data_bh->b_data, 0, blocksize); 2631 /* 2632 * Since the xe_name_offset is based on ocfs2_xattr_header, 2633 * there is a offset change corresponding to the change of 2634 * ocfs2_xattr_header's position. 2635 */ 2636 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2637 xe = &xb_xh->xh_entries[count - 1]; 2638 offset = le16_to_cpu(xe->xe_name_offset) + off_change; 2639 size = blocksize - offset; 2640 2641 /* copy all the names and values. */ 2642 if (data_bh) 2643 target = data_bh->b_data; 2644 memcpy(target + offset, src + offset, size); 2645 2646 /* Init new header now. */ 2647 xh->xh_count = xb_xh->xh_count; 2648 xh->xh_num_buckets = cpu_to_le16(1); 2649 xh->xh_name_value_len = cpu_to_le16(size); 2650 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size); 2651 2652 /* copy all the entries. */ 2653 target = xh_bh->b_data; 2654 offset = offsetof(struct ocfs2_xattr_header, xh_entries); 2655 size = count * sizeof(struct ocfs2_xattr_entry); 2656 memcpy(target + offset, (char *)xb_xh + offset, size); 2657 2658 /* Change the xe offset for all the xe because of the move. */ 2659 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize + 2660 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2661 for (i = 0; i < count; i++) 2662 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change); 2663 2664 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n", 2665 offset, size, off_change); 2666 2667 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry), 2668 cmp_xe, swap_xe); 2669 } 2670 2671 /* 2672 * After we move xattr from block to index btree, we have to 2673 * update ocfs2_xattr_search to the new xe and base. 2674 * 2675 * When the entry is in xattr block, xattr_bh indicates the storage place. 2676 * While if the entry is in index b-tree, "bucket" indicates the 2677 * real place of the xattr. 2678 */ 2679 static int ocfs2_xattr_update_xattr_search(struct inode *inode, 2680 struct ocfs2_xattr_search *xs, 2681 struct buffer_head *old_bh, 2682 struct buffer_head *new_bh) 2683 { 2684 int ret = 0; 2685 char *buf = old_bh->b_data; 2686 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf; 2687 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header; 2688 int i, blocksize = inode->i_sb->s_blocksize; 2689 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2690 2691 xs->bucket.bhs[0] = new_bh; 2692 get_bh(new_bh); 2693 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data; 2694 xs->header = xs->bucket.xh; 2695 2696 xs->base = new_bh->b_data; 2697 xs->end = xs->base + inode->i_sb->s_blocksize; 2698 2699 if (!xs->not_found) { 2700 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) { 2701 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2702 xs->bucket.bhs[0]->b_blocknr + 1, 2703 blk_per_bucket - 1, &xs->bucket.bhs[1], 2704 OCFS2_BH_CACHED, inode); 2705 if (ret) { 2706 mlog_errno(ret); 2707 return ret; 2708 } 2709 2710 i = xs->here - old_xh->xh_entries; 2711 xs->here = &xs->header->xh_entries[i]; 2712 } 2713 } 2714 2715 return ret; 2716 } 2717 2718 static int ocfs2_xattr_create_index_block(struct inode *inode, 2719 struct ocfs2_xattr_search *xs) 2720 { 2721 int ret, credits = OCFS2_SUBALLOC_ALLOC; 2722 u32 bit_off, len; 2723 u64 blkno; 2724 handle_t *handle; 2725 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2726 struct ocfs2_inode_info *oi = OCFS2_I(inode); 2727 struct ocfs2_alloc_context *data_ac; 2728 struct buffer_head *xh_bh = NULL, *data_bh = NULL; 2729 struct buffer_head *xb_bh = xs->xattr_bh; 2730 struct ocfs2_xattr_block *xb = 2731 (struct ocfs2_xattr_block *)xb_bh->b_data; 2732 struct ocfs2_xattr_tree_root *xr; 2733 u16 xb_flags = le16_to_cpu(xb->xb_flags); 2734 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2735 2736 mlog(0, "create xattr index block for %llu\n", 2737 (unsigned long long)xb_bh->b_blocknr); 2738 2739 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED); 2740 2741 ret = ocfs2_reserve_clusters(osb, 1, &data_ac); 2742 if (ret) { 2743 mlog_errno(ret); 2744 goto out; 2745 } 2746 2747 /* 2748 * XXX: 2749 * We can use this lock for now, and maybe move to a dedicated mutex 2750 * if performance becomes a problem later. 2751 */ 2752 down_write(&oi->ip_alloc_sem); 2753 2754 /* 2755 * 3 more credits, one for xattr block update, one for the 1st block 2756 * of the new xattr bucket and one for the value/data. 2757 */ 2758 credits += 3; 2759 handle = ocfs2_start_trans(osb, credits); 2760 if (IS_ERR(handle)) { 2761 ret = PTR_ERR(handle); 2762 mlog_errno(ret); 2763 goto out_sem; 2764 } 2765 2766 ret = ocfs2_journal_access(handle, inode, xb_bh, 2767 OCFS2_JOURNAL_ACCESS_WRITE); 2768 if (ret) { 2769 mlog_errno(ret); 2770 goto out_commit; 2771 } 2772 2773 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len); 2774 if (ret) { 2775 mlog_errno(ret); 2776 goto out_commit; 2777 } 2778 2779 /* 2780 * The bucket may spread in many blocks, and 2781 * we will only touch the 1st block and the last block 2782 * in the whole bucket(one for entry and one for data). 2783 */ 2784 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off); 2785 2786 mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno); 2787 2788 xh_bh = sb_getblk(inode->i_sb, blkno); 2789 if (!xh_bh) { 2790 ret = -EIO; 2791 mlog_errno(ret); 2792 goto out_commit; 2793 } 2794 2795 ocfs2_set_new_buffer_uptodate(inode, xh_bh); 2796 2797 ret = ocfs2_journal_access(handle, inode, xh_bh, 2798 OCFS2_JOURNAL_ACCESS_CREATE); 2799 if (ret) { 2800 mlog_errno(ret); 2801 goto out_commit; 2802 } 2803 2804 if (bpb > 1) { 2805 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1); 2806 if (!data_bh) { 2807 ret = -EIO; 2808 mlog_errno(ret); 2809 goto out_commit; 2810 } 2811 2812 ocfs2_set_new_buffer_uptodate(inode, data_bh); 2813 2814 ret = ocfs2_journal_access(handle, inode, data_bh, 2815 OCFS2_JOURNAL_ACCESS_CREATE); 2816 if (ret) { 2817 mlog_errno(ret); 2818 goto out_commit; 2819 } 2820 } 2821 2822 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh); 2823 2824 ocfs2_journal_dirty(handle, xh_bh); 2825 if (data_bh) 2826 ocfs2_journal_dirty(handle, data_bh); 2827 2828 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh); 2829 2830 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */ 2831 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 2832 offsetof(struct ocfs2_xattr_block, xb_attrs)); 2833 2834 xr = &xb->xb_attrs.xb_root; 2835 xr->xt_clusters = cpu_to_le32(1); 2836 xr->xt_last_eb_blk = 0; 2837 xr->xt_list.l_tree_depth = 0; 2838 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb)); 2839 xr->xt_list.l_next_free_rec = cpu_to_le16(1); 2840 2841 xr->xt_list.l_recs[0].e_cpos = 0; 2842 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno); 2843 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1); 2844 2845 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED); 2846 2847 ret = ocfs2_journal_dirty(handle, xb_bh); 2848 if (ret) { 2849 mlog_errno(ret); 2850 goto out_commit; 2851 } 2852 2853 out_commit: 2854 ocfs2_commit_trans(osb, handle); 2855 2856 out_sem: 2857 up_write(&oi->ip_alloc_sem); 2858 2859 out: 2860 if (data_ac) 2861 ocfs2_free_alloc_context(data_ac); 2862 2863 brelse(xh_bh); 2864 brelse(data_bh); 2865 2866 return ret; 2867 } 2868 2869 static int cmp_xe_offset(const void *a, const void *b) 2870 { 2871 const struct ocfs2_xattr_entry *l = a, *r = b; 2872 u32 l_name_offset = le16_to_cpu(l->xe_name_offset); 2873 u32 r_name_offset = le16_to_cpu(r->xe_name_offset); 2874 2875 if (l_name_offset < r_name_offset) 2876 return 1; 2877 if (l_name_offset > r_name_offset) 2878 return -1; 2879 return 0; 2880 } 2881 2882 /* 2883 * defrag a xattr bucket if we find that the bucket has some 2884 * holes beteen name/value pairs. 2885 * We will move all the name/value pairs to the end of the bucket 2886 * so that we can spare some space for insertion. 2887 */ 2888 static int ocfs2_defrag_xattr_bucket(struct inode *inode, 2889 struct ocfs2_xattr_bucket *bucket) 2890 { 2891 int ret, i; 2892 size_t end, offset, len, value_len; 2893 struct ocfs2_xattr_header *xh; 2894 char *entries, *buf, *bucket_buf = NULL; 2895 u64 blkno = bucket->bhs[0]->b_blocknr; 2896 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2897 u16 xh_free_start; 2898 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2899 size_t blocksize = inode->i_sb->s_blocksize; 2900 handle_t *handle; 2901 struct buffer_head **bhs; 2902 struct ocfs2_xattr_entry *xe; 2903 2904 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 2905 GFP_NOFS); 2906 if (!bhs) 2907 return -ENOMEM; 2908 2909 ret = ocfs2_read_blocks(osb, blkno, blk_per_bucket, bhs, 2910 OCFS2_BH_CACHED, inode); 2911 if (ret) 2912 goto out; 2913 2914 /* 2915 * In order to make the operation more efficient and generic, 2916 * we copy all the blocks into a contiguous memory and do the 2917 * defragment there, so if anything is error, we will not touch 2918 * the real block. 2919 */ 2920 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS); 2921 if (!bucket_buf) { 2922 ret = -EIO; 2923 goto out; 2924 } 2925 2926 buf = bucket_buf; 2927 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) 2928 memcpy(buf, bhs[i]->b_data, blocksize); 2929 2930 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket); 2931 if (IS_ERR(handle)) { 2932 ret = PTR_ERR(handle); 2933 handle = NULL; 2934 mlog_errno(ret); 2935 goto out; 2936 } 2937 2938 for (i = 0; i < blk_per_bucket; i++) { 2939 ret = ocfs2_journal_access(handle, inode, bhs[i], 2940 OCFS2_JOURNAL_ACCESS_WRITE); 2941 if (ret < 0) { 2942 mlog_errno(ret); 2943 goto commit; 2944 } 2945 } 2946 2947 xh = (struct ocfs2_xattr_header *)bucket_buf; 2948 entries = (char *)xh->xh_entries; 2949 xh_free_start = le16_to_cpu(xh->xh_free_start); 2950 2951 mlog(0, "adjust xattr bucket in %llu, count = %u, " 2952 "xh_free_start = %u, xh_name_value_len = %u.\n", 2953 blkno, le16_to_cpu(xh->xh_count), xh_free_start, 2954 le16_to_cpu(xh->xh_name_value_len)); 2955 2956 /* 2957 * sort all the entries by their offset. 2958 * the largest will be the first, so that we can 2959 * move them to the end one by one. 2960 */ 2961 sort(entries, le16_to_cpu(xh->xh_count), 2962 sizeof(struct ocfs2_xattr_entry), 2963 cmp_xe_offset, swap_xe); 2964 2965 /* Move all name/values to the end of the bucket. */ 2966 xe = xh->xh_entries; 2967 end = OCFS2_XATTR_BUCKET_SIZE; 2968 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) { 2969 offset = le16_to_cpu(xe->xe_name_offset); 2970 if (ocfs2_xattr_is_local(xe)) 2971 value_len = OCFS2_XATTR_SIZE( 2972 le64_to_cpu(xe->xe_value_size)); 2973 else 2974 value_len = OCFS2_XATTR_ROOT_SIZE; 2975 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len; 2976 2977 /* 2978 * We must make sure that the name/value pair 2979 * exist in the same block. So adjust end to 2980 * the previous block end if needed. 2981 */ 2982 if (((end - len) / blocksize != 2983 (end - 1) / blocksize)) 2984 end = end - end % blocksize; 2985 2986 if (end > offset + len) { 2987 memmove(bucket_buf + end - len, 2988 bucket_buf + offset, len); 2989 xe->xe_name_offset = cpu_to_le16(end - len); 2990 } 2991 2992 mlog_bug_on_msg(end < offset + len, "Defrag check failed for " 2993 "bucket %llu\n", (unsigned long long)blkno); 2994 2995 end -= len; 2996 } 2997 2998 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for " 2999 "bucket %llu\n", (unsigned long long)blkno); 3000 3001 if (xh_free_start == end) 3002 goto commit; 3003 3004 memset(bucket_buf + xh_free_start, 0, end - xh_free_start); 3005 xh->xh_free_start = cpu_to_le16(end); 3006 3007 /* sort the entries by their name_hash. */ 3008 sort(entries, le16_to_cpu(xh->xh_count), 3009 sizeof(struct ocfs2_xattr_entry), 3010 cmp_xe, swap_xe); 3011 3012 buf = bucket_buf; 3013 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) { 3014 memcpy(bhs[i]->b_data, buf, blocksize); 3015 ocfs2_journal_dirty(handle, bhs[i]); 3016 } 3017 3018 commit: 3019 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 3020 out: 3021 3022 if (bhs) { 3023 for (i = 0; i < blk_per_bucket; i++) 3024 brelse(bhs[i]); 3025 } 3026 kfree(bhs); 3027 3028 kfree(bucket_buf); 3029 return ret; 3030 } 3031 3032 /* 3033 * Move half nums of the xattr bucket in the previous cluster to this new 3034 * cluster. We only touch the last cluster of the previous extend record. 3035 * 3036 * first_bh is the first buffer_head of a series of bucket in the same 3037 * extent rec and header_bh is the header of one bucket in this cluster. 3038 * They will be updated if we move the data header_bh contains to the new 3039 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster. 3040 */ 3041 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode, 3042 handle_t *handle, 3043 struct buffer_head **first_bh, 3044 struct buffer_head **header_bh, 3045 u64 new_blkno, 3046 u64 prev_blkno, 3047 u32 num_clusters, 3048 u32 *first_hash) 3049 { 3050 int i, ret, credits; 3051 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3052 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3053 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3054 int blocksize = inode->i_sb->s_blocksize; 3055 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL; 3056 struct ocfs2_xattr_header *new_xh; 3057 struct ocfs2_xattr_header *xh = 3058 (struct ocfs2_xattr_header *)((*first_bh)->b_data); 3059 3060 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets); 3061 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize); 3062 3063 prev_bh = *first_bh; 3064 get_bh(prev_bh); 3065 xh = (struct ocfs2_xattr_header *)prev_bh->b_data; 3066 3067 prev_blkno += (num_clusters - 1) * bpc + bpc / 2; 3068 3069 mlog(0, "move half of xattrs in cluster %llu to %llu\n", 3070 prev_blkno, new_blkno); 3071 3072 /* 3073 * We need to update the 1st half of the new cluster and 3074 * 1 more for the update of the 1st bucket of the previous 3075 * extent record. 3076 */ 3077 credits = bpc / 2 + 1; 3078 ret = ocfs2_extend_trans(handle, credits); 3079 if (ret) { 3080 mlog_errno(ret); 3081 goto out; 3082 } 3083 3084 ret = ocfs2_journal_access(handle, inode, prev_bh, 3085 OCFS2_JOURNAL_ACCESS_WRITE); 3086 if (ret) { 3087 mlog_errno(ret); 3088 goto out; 3089 } 3090 3091 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) { 3092 old_bh = new_bh = NULL; 3093 new_bh = sb_getblk(inode->i_sb, new_blkno); 3094 if (!new_bh) { 3095 ret = -EIO; 3096 mlog_errno(ret); 3097 goto out; 3098 } 3099 3100 ocfs2_set_new_buffer_uptodate(inode, new_bh); 3101 3102 ret = ocfs2_journal_access(handle, inode, new_bh, 3103 OCFS2_JOURNAL_ACCESS_CREATE); 3104 if (ret < 0) { 3105 mlog_errno(ret); 3106 brelse(new_bh); 3107 goto out; 3108 } 3109 3110 ret = ocfs2_read_block(osb, prev_blkno, 3111 &old_bh, OCFS2_BH_CACHED, inode); 3112 if (ret < 0) { 3113 mlog_errno(ret); 3114 brelse(new_bh); 3115 goto out; 3116 } 3117 3118 memcpy(new_bh->b_data, old_bh->b_data, blocksize); 3119 3120 if (i == 0) { 3121 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data; 3122 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2); 3123 3124 if (first_hash) 3125 *first_hash = le32_to_cpu( 3126 new_xh->xh_entries[0].xe_name_hash); 3127 new_first_bh = new_bh; 3128 get_bh(new_first_bh); 3129 } 3130 3131 ocfs2_journal_dirty(handle, new_bh); 3132 3133 if (*header_bh == old_bh) { 3134 brelse(*header_bh); 3135 *header_bh = new_bh; 3136 get_bh(*header_bh); 3137 3138 brelse(*first_bh); 3139 *first_bh = new_first_bh; 3140 get_bh(*first_bh); 3141 } 3142 brelse(new_bh); 3143 brelse(old_bh); 3144 } 3145 3146 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2)); 3147 3148 ocfs2_journal_dirty(handle, prev_bh); 3149 out: 3150 brelse(prev_bh); 3151 brelse(new_first_bh); 3152 return ret; 3153 } 3154 3155 static int ocfs2_read_xattr_bucket(struct inode *inode, 3156 u64 blkno, 3157 struct buffer_head **bhs, 3158 int new) 3159 { 3160 int ret = 0; 3161 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3162 3163 if (!new) 3164 return ocfs2_read_blocks(OCFS2_SB(inode->i_sb), blkno, 3165 blk_per_bucket, bhs, 3166 OCFS2_BH_CACHED, inode); 3167 3168 for (i = 0; i < blk_per_bucket; i++) { 3169 bhs[i] = sb_getblk(inode->i_sb, blkno + i); 3170 if (bhs[i] == NULL) { 3171 ret = -EIO; 3172 mlog_errno(ret); 3173 break; 3174 } 3175 ocfs2_set_new_buffer_uptodate(inode, bhs[i]); 3176 } 3177 3178 return ret; 3179 } 3180 3181 /* 3182 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk). 3183 * first_hash will record the 1st hash of the new bucket. 3184 */ 3185 static int ocfs2_half_xattr_bucket(struct inode *inode, 3186 handle_t *handle, 3187 u64 blk, 3188 u64 new_blk, 3189 u32 *first_hash, 3190 int new_bucket_head) 3191 { 3192 int ret, i; 3193 u16 count, start, len, name_value_len, xe_len, name_offset; 3194 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3195 struct buffer_head **s_bhs, **t_bhs = NULL; 3196 struct ocfs2_xattr_header *xh; 3197 struct ocfs2_xattr_entry *xe; 3198 int blocksize = inode->i_sb->s_blocksize; 3199 3200 mlog(0, "move half of xattrs from bucket %llu to %llu\n", 3201 blk, new_blk); 3202 3203 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3204 if (!s_bhs) 3205 return -ENOMEM; 3206 3207 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0); 3208 if (ret) { 3209 mlog_errno(ret); 3210 goto out; 3211 } 3212 3213 ret = ocfs2_journal_access(handle, inode, s_bhs[0], 3214 OCFS2_JOURNAL_ACCESS_WRITE); 3215 if (ret) { 3216 mlog_errno(ret); 3217 goto out; 3218 } 3219 3220 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3221 if (!t_bhs) { 3222 ret = -ENOMEM; 3223 goto out; 3224 } 3225 3226 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head); 3227 if (ret) { 3228 mlog_errno(ret); 3229 goto out; 3230 } 3231 3232 for (i = 0; i < blk_per_bucket; i++) { 3233 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3234 OCFS2_JOURNAL_ACCESS_CREATE); 3235 if (ret) { 3236 mlog_errno(ret); 3237 goto out; 3238 } 3239 } 3240 3241 /* copy the whole bucket to the new first. */ 3242 for (i = 0; i < blk_per_bucket; i++) 3243 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3244 3245 /* update the new bucket. */ 3246 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data; 3247 count = le16_to_cpu(xh->xh_count); 3248 start = count / 2; 3249 3250 /* 3251 * Calculate the total name/value len and xh_free_start for 3252 * the old bucket first. 3253 */ 3254 name_offset = OCFS2_XATTR_BUCKET_SIZE; 3255 name_value_len = 0; 3256 for (i = 0; i < start; i++) { 3257 xe = &xh->xh_entries[i]; 3258 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3259 if (ocfs2_xattr_is_local(xe)) 3260 xe_len += 3261 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3262 else 3263 xe_len += OCFS2_XATTR_ROOT_SIZE; 3264 name_value_len += xe_len; 3265 if (le16_to_cpu(xe->xe_name_offset) < name_offset) 3266 name_offset = le16_to_cpu(xe->xe_name_offset); 3267 } 3268 3269 /* 3270 * Now begin the modification to the new bucket. 3271 * 3272 * In the new bucket, We just move the xattr entry to the beginning 3273 * and don't touch the name/value. So there will be some holes in the 3274 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is 3275 * called. 3276 */ 3277 xe = &xh->xh_entries[start]; 3278 len = sizeof(struct ocfs2_xattr_entry) * (count - start); 3279 mlog(0, "mv xattr entry len %d from %d to %d\n", len, 3280 (int)((char *)xe - (char *)xh), 3281 (int)((char *)xh->xh_entries - (char *)xh)); 3282 memmove((char *)xh->xh_entries, (char *)xe, len); 3283 xe = &xh->xh_entries[count - start]; 3284 len = sizeof(struct ocfs2_xattr_entry) * start; 3285 memset((char *)xe, 0, len); 3286 3287 le16_add_cpu(&xh->xh_count, -start); 3288 le16_add_cpu(&xh->xh_name_value_len, -name_value_len); 3289 3290 /* Calculate xh_free_start for the new bucket. */ 3291 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); 3292 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 3293 xe = &xh->xh_entries[i]; 3294 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3295 if (ocfs2_xattr_is_local(xe)) 3296 xe_len += 3297 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3298 else 3299 xe_len += OCFS2_XATTR_ROOT_SIZE; 3300 if (le16_to_cpu(xe->xe_name_offset) < 3301 le16_to_cpu(xh->xh_free_start)) 3302 xh->xh_free_start = xe->xe_name_offset; 3303 } 3304 3305 /* set xh->xh_num_buckets for the new xh. */ 3306 if (new_bucket_head) 3307 xh->xh_num_buckets = cpu_to_le16(1); 3308 else 3309 xh->xh_num_buckets = 0; 3310 3311 for (i = 0; i < blk_per_bucket; i++) { 3312 ocfs2_journal_dirty(handle, t_bhs[i]); 3313 if (ret) 3314 mlog_errno(ret); 3315 } 3316 3317 /* store the first_hash of the new bucket. */ 3318 if (first_hash) 3319 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3320 3321 /* 3322 * Now only update the 1st block of the old bucket. 3323 * Please note that the entry has been sorted already above. 3324 */ 3325 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data; 3326 memset(&xh->xh_entries[start], 0, 3327 sizeof(struct ocfs2_xattr_entry) * (count - start)); 3328 xh->xh_count = cpu_to_le16(start); 3329 xh->xh_free_start = cpu_to_le16(name_offset); 3330 xh->xh_name_value_len = cpu_to_le16(name_value_len); 3331 3332 ocfs2_journal_dirty(handle, s_bhs[0]); 3333 if (ret) 3334 mlog_errno(ret); 3335 3336 out: 3337 if (s_bhs) { 3338 for (i = 0; i < blk_per_bucket; i++) 3339 brelse(s_bhs[i]); 3340 } 3341 kfree(s_bhs); 3342 3343 if (t_bhs) { 3344 for (i = 0; i < blk_per_bucket; i++) 3345 brelse(t_bhs[i]); 3346 } 3347 kfree(t_bhs); 3348 3349 return ret; 3350 } 3351 3352 /* 3353 * Copy xattr from one bucket to another bucket. 3354 * 3355 * The caller must make sure that the journal transaction 3356 * has enough space for journaling. 3357 */ 3358 static int ocfs2_cp_xattr_bucket(struct inode *inode, 3359 handle_t *handle, 3360 u64 s_blkno, 3361 u64 t_blkno, 3362 int t_is_new) 3363 { 3364 int ret, i; 3365 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3366 int blocksize = inode->i_sb->s_blocksize; 3367 struct buffer_head **s_bhs, **t_bhs = NULL; 3368 3369 BUG_ON(s_blkno == t_blkno); 3370 3371 mlog(0, "cp bucket %llu to %llu, target is %d\n", 3372 s_blkno, t_blkno, t_is_new); 3373 3374 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3375 GFP_NOFS); 3376 if (!s_bhs) 3377 return -ENOMEM; 3378 3379 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0); 3380 if (ret) 3381 goto out; 3382 3383 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3384 GFP_NOFS); 3385 if (!t_bhs) { 3386 ret = -ENOMEM; 3387 goto out; 3388 } 3389 3390 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new); 3391 if (ret) 3392 goto out; 3393 3394 for (i = 0; i < blk_per_bucket; i++) { 3395 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3396 OCFS2_JOURNAL_ACCESS_WRITE); 3397 if (ret) 3398 goto out; 3399 } 3400 3401 for (i = 0; i < blk_per_bucket; i++) { 3402 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3403 ocfs2_journal_dirty(handle, t_bhs[i]); 3404 } 3405 3406 out: 3407 if (s_bhs) { 3408 for (i = 0; i < blk_per_bucket; i++) 3409 brelse(s_bhs[i]); 3410 } 3411 kfree(s_bhs); 3412 3413 if (t_bhs) { 3414 for (i = 0; i < blk_per_bucket; i++) 3415 brelse(t_bhs[i]); 3416 } 3417 kfree(t_bhs); 3418 3419 return ret; 3420 } 3421 3422 /* 3423 * Copy one xattr cluster from src_blk to to_blk. 3424 * The to_blk will become the first bucket header of the cluster, so its 3425 * xh_num_buckets will be initialized as the bucket num in the cluster. 3426 */ 3427 static int ocfs2_cp_xattr_cluster(struct inode *inode, 3428 handle_t *handle, 3429 struct buffer_head *first_bh, 3430 u64 src_blk, 3431 u64 to_blk, 3432 u32 *first_hash) 3433 { 3434 int i, ret, credits; 3435 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3436 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3437 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3438 struct buffer_head *bh = NULL; 3439 struct ocfs2_xattr_header *xh; 3440 u64 to_blk_start = to_blk; 3441 3442 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk); 3443 3444 /* 3445 * We need to update the new cluster and 1 more for the update of 3446 * the 1st bucket of the previous extent rec. 3447 */ 3448 credits = bpc + 1; 3449 ret = ocfs2_extend_trans(handle, credits); 3450 if (ret) { 3451 mlog_errno(ret); 3452 goto out; 3453 } 3454 3455 ret = ocfs2_journal_access(handle, inode, first_bh, 3456 OCFS2_JOURNAL_ACCESS_WRITE); 3457 if (ret) { 3458 mlog_errno(ret); 3459 goto out; 3460 } 3461 3462 for (i = 0; i < num_buckets; i++) { 3463 ret = ocfs2_cp_xattr_bucket(inode, handle, 3464 src_blk, to_blk, 1); 3465 if (ret) { 3466 mlog_errno(ret); 3467 goto out; 3468 } 3469 3470 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3471 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3472 } 3473 3474 /* update the old bucket header. */ 3475 xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3476 le16_add_cpu(&xh->xh_num_buckets, -num_buckets); 3477 3478 ocfs2_journal_dirty(handle, first_bh); 3479 3480 /* update the new bucket header. */ 3481 ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode); 3482 if (ret < 0) { 3483 mlog_errno(ret); 3484 goto out; 3485 } 3486 3487 ret = ocfs2_journal_access(handle, inode, bh, 3488 OCFS2_JOURNAL_ACCESS_WRITE); 3489 if (ret) { 3490 mlog_errno(ret); 3491 goto out; 3492 } 3493 3494 xh = (struct ocfs2_xattr_header *)bh->b_data; 3495 xh->xh_num_buckets = cpu_to_le16(num_buckets); 3496 3497 ocfs2_journal_dirty(handle, bh); 3498 3499 if (first_hash) 3500 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3501 out: 3502 brelse(bh); 3503 return ret; 3504 } 3505 3506 /* 3507 * Move half of the xattrs in this cluster to the new cluster. 3508 * This function should only be called when bucket size == cluster size. 3509 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead. 3510 */ 3511 static int ocfs2_half_xattr_cluster(struct inode *inode, 3512 handle_t *handle, 3513 u64 prev_blk, 3514 u64 new_blk, 3515 u32 *first_hash) 3516 { 3517 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3518 int ret, credits = 2 * blk_per_bucket; 3519 3520 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize); 3521 3522 ret = ocfs2_extend_trans(handle, credits); 3523 if (ret) { 3524 mlog_errno(ret); 3525 return ret; 3526 } 3527 3528 /* Move half of the xattr in start_blk to the next bucket. */ 3529 return ocfs2_half_xattr_bucket(inode, handle, prev_blk, 3530 new_blk, first_hash, 1); 3531 } 3532 3533 /* 3534 * Move some xattrs from the old cluster to the new one since they are not 3535 * contiguous in ocfs2 xattr tree. 3536 * 3537 * new_blk starts a new separate cluster, and we will move some xattrs from 3538 * prev_blk to it. v_start will be set as the first name hash value in this 3539 * new cluster so that it can be used as e_cpos during tree insertion and 3540 * don't collide with our original b-tree operations. first_bh and header_bh 3541 * will also be updated since they will be used in ocfs2_extend_xattr_bucket 3542 * to extend the insert bucket. 3543 * 3544 * The problem is how much xattr should we move to the new one and when should 3545 * we update first_bh and header_bh? 3546 * 1. If cluster size > bucket size, that means the previous cluster has more 3547 * than 1 bucket, so just move half nums of bucket into the new cluster and 3548 * update the first_bh and header_bh if the insert bucket has been moved 3549 * to the new cluster. 3550 * 2. If cluster_size == bucket_size: 3551 * a) If the previous extent rec has more than one cluster and the insert 3552 * place isn't in the last cluster, copy the entire last cluster to the 3553 * new one. This time, we don't need to upate the first_bh and header_bh 3554 * since they will not be moved into the new cluster. 3555 * b) Otherwise, move the bottom half of the xattrs in the last cluster into 3556 * the new one. And we set the extend flag to zero if the insert place is 3557 * moved into the new allocated cluster since no extend is needed. 3558 */ 3559 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode, 3560 handle_t *handle, 3561 struct buffer_head **first_bh, 3562 struct buffer_head **header_bh, 3563 u64 new_blk, 3564 u64 prev_blk, 3565 u32 prev_clusters, 3566 u32 *v_start, 3567 int *extend) 3568 { 3569 int ret = 0; 3570 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3571 3572 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n", 3573 prev_blk, prev_clusters, new_blk); 3574 3575 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) 3576 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode, 3577 handle, 3578 first_bh, 3579 header_bh, 3580 new_blk, 3581 prev_blk, 3582 prev_clusters, 3583 v_start); 3584 else { 3585 u64 last_blk = prev_blk + bpc * (prev_clusters - 1); 3586 3587 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk) 3588 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh, 3589 last_blk, new_blk, 3590 v_start); 3591 else { 3592 ret = ocfs2_half_xattr_cluster(inode, handle, 3593 last_blk, new_blk, 3594 v_start); 3595 3596 if ((*header_bh)->b_blocknr == last_blk && extend) 3597 *extend = 0; 3598 } 3599 } 3600 3601 return ret; 3602 } 3603 3604 /* 3605 * Add a new cluster for xattr storage. 3606 * 3607 * If the new cluster is contiguous with the previous one, it will be 3608 * appended to the same extent record, and num_clusters will be updated. 3609 * If not, we will insert a new extent for it and move some xattrs in 3610 * the last cluster into the new allocated one. 3611 * We also need to limit the maximum size of a btree leaf, otherwise we'll 3612 * lose the benefits of hashing because we'll have to search large leaves. 3613 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize, 3614 * if it's bigger). 3615 * 3616 * first_bh is the first block of the previous extent rec and header_bh 3617 * indicates the bucket we will insert the new xattrs. They will be updated 3618 * when the header_bh is moved into the new cluster. 3619 */ 3620 static int ocfs2_add_new_xattr_cluster(struct inode *inode, 3621 struct buffer_head *root_bh, 3622 struct buffer_head **first_bh, 3623 struct buffer_head **header_bh, 3624 u32 *num_clusters, 3625 u32 prev_cpos, 3626 u64 prev_blkno, 3627 int *extend) 3628 { 3629 int ret, credits; 3630 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3631 u32 prev_clusters = *num_clusters; 3632 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0; 3633 u64 block; 3634 handle_t *handle = NULL; 3635 struct ocfs2_alloc_context *data_ac = NULL; 3636 struct ocfs2_alloc_context *meta_ac = NULL; 3637 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3638 struct ocfs2_extent_tree et; 3639 3640 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, " 3641 "previous xattr blkno = %llu\n", 3642 (unsigned long long)OCFS2_I(inode)->ip_blkno, 3643 prev_cpos, prev_blkno); 3644 3645 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh); 3646 3647 ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, 3648 &data_ac, &meta_ac); 3649 if (ret) { 3650 mlog_errno(ret); 3651 goto leave; 3652 } 3653 3654 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el, 3655 clusters_to_add); 3656 handle = ocfs2_start_trans(osb, credits); 3657 if (IS_ERR(handle)) { 3658 ret = PTR_ERR(handle); 3659 handle = NULL; 3660 mlog_errno(ret); 3661 goto leave; 3662 } 3663 3664 ret = ocfs2_journal_access(handle, inode, root_bh, 3665 OCFS2_JOURNAL_ACCESS_WRITE); 3666 if (ret < 0) { 3667 mlog_errno(ret); 3668 goto leave; 3669 } 3670 3671 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1, 3672 clusters_to_add, &bit_off, &num_bits); 3673 if (ret < 0) { 3674 if (ret != -ENOSPC) 3675 mlog_errno(ret); 3676 goto leave; 3677 } 3678 3679 BUG_ON(num_bits > clusters_to_add); 3680 3681 block = ocfs2_clusters_to_blocks(osb->sb, bit_off); 3682 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n", 3683 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); 3684 3685 if (prev_blkno + prev_clusters * bpc == block && 3686 (prev_clusters + num_bits) << osb->s_clustersize_bits <= 3687 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) { 3688 /* 3689 * If this cluster is contiguous with the old one and 3690 * adding this new cluster, we don't surpass the limit of 3691 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be 3692 * initialized and used like other buckets in the previous 3693 * cluster. 3694 * So add it as a contiguous one. The caller will handle 3695 * its init process. 3696 */ 3697 v_start = prev_cpos + prev_clusters; 3698 *num_clusters = prev_clusters + num_bits; 3699 mlog(0, "Add contiguous %u clusters to previous extent rec.\n", 3700 num_bits); 3701 } else { 3702 ret = ocfs2_adjust_xattr_cross_cluster(inode, 3703 handle, 3704 first_bh, 3705 header_bh, 3706 block, 3707 prev_blkno, 3708 prev_clusters, 3709 &v_start, 3710 extend); 3711 if (ret) { 3712 mlog_errno(ret); 3713 goto leave; 3714 } 3715 } 3716 3717 if (handle->h_buffer_credits < credits) { 3718 /* 3719 * The journal has been restarted before, and don't 3720 * have enough space for the insertion, so extend it 3721 * here. 3722 */ 3723 ret = ocfs2_extend_trans(handle, credits); 3724 if (ret) { 3725 mlog_errno(ret); 3726 goto leave; 3727 } 3728 } 3729 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n", 3730 num_bits, block, v_start); 3731 ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block, 3732 num_bits, 0, meta_ac); 3733 if (ret < 0) { 3734 mlog_errno(ret); 3735 goto leave; 3736 } 3737 3738 ret = ocfs2_journal_dirty(handle, root_bh); 3739 if (ret < 0) { 3740 mlog_errno(ret); 3741 goto leave; 3742 } 3743 3744 leave: 3745 if (handle) 3746 ocfs2_commit_trans(osb, handle); 3747 if (data_ac) 3748 ocfs2_free_alloc_context(data_ac); 3749 if (meta_ac) 3750 ocfs2_free_alloc_context(meta_ac); 3751 3752 return ret; 3753 } 3754 3755 /* 3756 * Extend a new xattr bucket and move xattrs to the end one by one until 3757 * We meet with start_bh. Only move half of the xattrs to the bucket after it. 3758 */ 3759 static int ocfs2_extend_xattr_bucket(struct inode *inode, 3760 struct buffer_head *first_bh, 3761 struct buffer_head *start_bh, 3762 u32 num_clusters) 3763 { 3764 int ret, credits; 3765 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3766 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3767 u64 start_blk = start_bh->b_blocknr, end_blk; 3768 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb); 3769 handle_t *handle; 3770 struct ocfs2_xattr_header *first_xh = 3771 (struct ocfs2_xattr_header *)first_bh->b_data; 3772 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets); 3773 3774 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting " 3775 "from %llu, len = %u\n", start_blk, 3776 (unsigned long long)first_bh->b_blocknr, num_clusters); 3777 3778 BUG_ON(bucket >= num_buckets); 3779 3780 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket; 3781 3782 /* 3783 * We will touch all the buckets after the start_bh(include it). 3784 * Add one more bucket and modify the first_bh. 3785 */ 3786 credits = end_blk - start_blk + 2 * blk_per_bucket + 1; 3787 handle = ocfs2_start_trans(osb, credits); 3788 if (IS_ERR(handle)) { 3789 ret = PTR_ERR(handle); 3790 handle = NULL; 3791 mlog_errno(ret); 3792 goto out; 3793 } 3794 3795 ret = ocfs2_journal_access(handle, inode, first_bh, 3796 OCFS2_JOURNAL_ACCESS_WRITE); 3797 if (ret) { 3798 mlog_errno(ret); 3799 goto commit; 3800 } 3801 3802 while (end_blk != start_blk) { 3803 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk, 3804 end_blk + blk_per_bucket, 0); 3805 if (ret) 3806 goto commit; 3807 end_blk -= blk_per_bucket; 3808 } 3809 3810 /* Move half of the xattr in start_blk to the next bucket. */ 3811 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk, 3812 start_blk + blk_per_bucket, NULL, 0); 3813 3814 le16_add_cpu(&first_xh->xh_num_buckets, 1); 3815 ocfs2_journal_dirty(handle, first_bh); 3816 3817 commit: 3818 ocfs2_commit_trans(osb, handle); 3819 out: 3820 return ret; 3821 } 3822 3823 /* 3824 * Add new xattr bucket in an extent record and adjust the buckets accordingly. 3825 * xb_bh is the ocfs2_xattr_block. 3826 * We will move all the buckets starting from header_bh to the next place. As 3827 * for this one, half num of its xattrs will be moved to the next one. 3828 * 3829 * We will allocate a new cluster if current cluster is full and adjust 3830 * header_bh and first_bh if the insert place is moved to the new cluster. 3831 */ 3832 static int ocfs2_add_new_xattr_bucket(struct inode *inode, 3833 struct buffer_head *xb_bh, 3834 struct buffer_head *header_bh) 3835 { 3836 struct ocfs2_xattr_header *first_xh = NULL; 3837 struct buffer_head *first_bh = NULL; 3838 struct ocfs2_xattr_block *xb = 3839 (struct ocfs2_xattr_block *)xb_bh->b_data; 3840 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 3841 struct ocfs2_extent_list *el = &xb_root->xt_list; 3842 struct ocfs2_xattr_header *xh = 3843 (struct ocfs2_xattr_header *)header_bh->b_data; 3844 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3845 struct super_block *sb = inode->i_sb; 3846 struct ocfs2_super *osb = OCFS2_SB(sb); 3847 int ret, num_buckets, extend = 1; 3848 u64 p_blkno; 3849 u32 e_cpos, num_clusters; 3850 3851 mlog(0, "Add new xattr bucket starting form %llu\n", 3852 (unsigned long long)header_bh->b_blocknr); 3853 3854 /* 3855 * Add refrence for header_bh here because it may be 3856 * changed in ocfs2_add_new_xattr_cluster and we need 3857 * to free it in the end. 3858 */ 3859 get_bh(header_bh); 3860 3861 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos, 3862 &num_clusters, el); 3863 if (ret) { 3864 mlog_errno(ret); 3865 goto out; 3866 } 3867 3868 ret = ocfs2_read_block(osb, p_blkno, 3869 &first_bh, OCFS2_BH_CACHED, inode); 3870 if (ret) { 3871 mlog_errno(ret); 3872 goto out; 3873 } 3874 3875 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters; 3876 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3877 3878 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) { 3879 ret = ocfs2_add_new_xattr_cluster(inode, 3880 xb_bh, 3881 &first_bh, 3882 &header_bh, 3883 &num_clusters, 3884 e_cpos, 3885 p_blkno, 3886 &extend); 3887 if (ret) { 3888 mlog_errno(ret); 3889 goto out; 3890 } 3891 } 3892 3893 if (extend) 3894 ret = ocfs2_extend_xattr_bucket(inode, 3895 first_bh, 3896 header_bh, 3897 num_clusters); 3898 if (ret) 3899 mlog_errno(ret); 3900 out: 3901 brelse(first_bh); 3902 brelse(header_bh); 3903 return ret; 3904 } 3905 3906 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode, 3907 struct ocfs2_xattr_bucket *bucket, 3908 int offs) 3909 { 3910 int block_off = offs >> inode->i_sb->s_blocksize_bits; 3911 3912 offs = offs % inode->i_sb->s_blocksize; 3913 return bucket->bhs[block_off]->b_data + offs; 3914 } 3915 3916 /* 3917 * Handle the normal xattr set, including replace, delete and new. 3918 * When the bucket is empty, "is_empty" is set and the caller can 3919 * free this bucket. 3920 * 3921 * Note: "local" indicates the real data's locality. So we can't 3922 * just its bucket locality by its length. 3923 */ 3924 static void ocfs2_xattr_set_entry_normal(struct inode *inode, 3925 struct ocfs2_xattr_info *xi, 3926 struct ocfs2_xattr_search *xs, 3927 u32 name_hash, 3928 int local, 3929 int *is_empty) 3930 { 3931 struct ocfs2_xattr_entry *last, *xe; 3932 int name_len = strlen(xi->name); 3933 struct ocfs2_xattr_header *xh = xs->header; 3934 u16 count = le16_to_cpu(xh->xh_count), start; 3935 size_t blocksize = inode->i_sb->s_blocksize; 3936 char *val; 3937 size_t offs, size, new_size; 3938 3939 last = &xh->xh_entries[count]; 3940 if (!xs->not_found) { 3941 xe = xs->here; 3942 offs = le16_to_cpu(xe->xe_name_offset); 3943 if (ocfs2_xattr_is_local(xe)) 3944 size = OCFS2_XATTR_SIZE(name_len) + 3945 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3946 else 3947 size = OCFS2_XATTR_SIZE(name_len) + 3948 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 3949 3950 /* 3951 * If the new value will be stored outside, xi->value has been 3952 * initalized as an empty ocfs2_xattr_value_root, and the same 3953 * goes with xi->value_len, so we can set new_size safely here. 3954 * See ocfs2_xattr_set_in_bucket. 3955 */ 3956 new_size = OCFS2_XATTR_SIZE(name_len) + 3957 OCFS2_XATTR_SIZE(xi->value_len); 3958 3959 le16_add_cpu(&xh->xh_name_value_len, -size); 3960 if (xi->value) { 3961 if (new_size > size) 3962 goto set_new_name_value; 3963 3964 /* Now replace the old value with new one. */ 3965 if (local) 3966 xe->xe_value_size = cpu_to_le64(xi->value_len); 3967 else 3968 xe->xe_value_size = 0; 3969 3970 val = ocfs2_xattr_bucket_get_val(inode, 3971 &xs->bucket, offs); 3972 memset(val + OCFS2_XATTR_SIZE(name_len), 0, 3973 size - OCFS2_XATTR_SIZE(name_len)); 3974 if (OCFS2_XATTR_SIZE(xi->value_len) > 0) 3975 memcpy(val + OCFS2_XATTR_SIZE(name_len), 3976 xi->value, xi->value_len); 3977 3978 le16_add_cpu(&xh->xh_name_value_len, new_size); 3979 ocfs2_xattr_set_local(xe, local); 3980 return; 3981 } else { 3982 /* Remove the old entry. */ 3983 last -= 1; 3984 memmove(xe, xe + 1, 3985 (void *)last - (void *)xe); 3986 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 3987 le16_add_cpu(&xh->xh_count, -1); 3988 if (xh->xh_count == 0 && is_empty) 3989 *is_empty = 1; 3990 return; 3991 } 3992 } else { 3993 /* find a new entry for insert. */ 3994 int low = 0, high = count - 1, tmp; 3995 struct ocfs2_xattr_entry *tmp_xe; 3996 3997 while (low <= high) { 3998 tmp = (low + high) / 2; 3999 tmp_xe = &xh->xh_entries[tmp]; 4000 4001 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash)) 4002 low = tmp + 1; 4003 else if (name_hash < 4004 le32_to_cpu(tmp_xe->xe_name_hash)) 4005 high = tmp - 1; 4006 else { 4007 low = tmp; 4008 break; 4009 } 4010 } 4011 4012 xe = &xh->xh_entries[low]; 4013 if (low != count) 4014 memmove(xe + 1, xe, (void *)last - (void *)xe); 4015 4016 le16_add_cpu(&xh->xh_count, 1); 4017 memset(xe, 0, sizeof(struct ocfs2_xattr_entry)); 4018 xe->xe_name_hash = cpu_to_le32(name_hash); 4019 xe->xe_name_len = name_len; 4020 ocfs2_xattr_set_type(xe, xi->name_index); 4021 } 4022 4023 set_new_name_value: 4024 /* Insert the new name+value. */ 4025 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len); 4026 4027 /* 4028 * We must make sure that the name/value pair 4029 * exists in the same block. 4030 */ 4031 offs = le16_to_cpu(xh->xh_free_start); 4032 start = offs - size; 4033 4034 if (start >> inode->i_sb->s_blocksize_bits != 4035 (offs - 1) >> inode->i_sb->s_blocksize_bits) { 4036 offs = offs - offs % blocksize; 4037 xh->xh_free_start = cpu_to_le16(offs); 4038 } 4039 4040 val = ocfs2_xattr_bucket_get_val(inode, 4041 &xs->bucket, offs - size); 4042 xe->xe_name_offset = cpu_to_le16(offs - size); 4043 4044 memset(val, 0, size); 4045 memcpy(val, xi->name, name_len); 4046 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); 4047 4048 xe->xe_value_size = cpu_to_le64(xi->value_len); 4049 ocfs2_xattr_set_local(xe, local); 4050 xs->here = xe; 4051 le16_add_cpu(&xh->xh_free_start, -size); 4052 le16_add_cpu(&xh->xh_name_value_len, size); 4053 4054 return; 4055 } 4056 4057 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode, 4058 handle_t *handle, 4059 struct ocfs2_xattr_search *xs, 4060 struct buffer_head **bhs, 4061 u16 bh_num) 4062 { 4063 int ret = 0, off, block_off; 4064 struct ocfs2_xattr_entry *xe = xs->here; 4065 4066 /* 4067 * First calculate all the blocks we should journal_access 4068 * and journal_dirty. The first block should always be touched. 4069 */ 4070 ret = ocfs2_journal_dirty(handle, bhs[0]); 4071 if (ret) 4072 mlog_errno(ret); 4073 4074 /* calc the data. */ 4075 off = le16_to_cpu(xe->xe_name_offset); 4076 block_off = off >> inode->i_sb->s_blocksize_bits; 4077 ret = ocfs2_journal_dirty(handle, bhs[block_off]); 4078 if (ret) 4079 mlog_errno(ret); 4080 4081 return ret; 4082 } 4083 4084 /* 4085 * Set the xattr entry in the specified bucket. 4086 * The bucket is indicated by xs->bucket and it should have the enough 4087 * space for the xattr insertion. 4088 */ 4089 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode, 4090 struct ocfs2_xattr_info *xi, 4091 struct ocfs2_xattr_search *xs, 4092 u32 name_hash, 4093 int local, 4094 int *bucket_empty) 4095 { 4096 int i, ret; 4097 handle_t *handle = NULL; 4098 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4099 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4100 4101 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n", 4102 (unsigned long)xi->value_len, xi->name_index, 4103 (unsigned long long)xs->bucket.bhs[0]->b_blocknr); 4104 4105 if (!xs->bucket.bhs[1]) { 4106 ret = ocfs2_read_blocks(osb, 4107 xs->bucket.bhs[0]->b_blocknr + 1, 4108 blk_per_bucket - 1, &xs->bucket.bhs[1], 4109 OCFS2_BH_CACHED, inode); 4110 if (ret) { 4111 mlog_errno(ret); 4112 goto out; 4113 } 4114 } 4115 4116 handle = ocfs2_start_trans(osb, blk_per_bucket); 4117 if (IS_ERR(handle)) { 4118 ret = PTR_ERR(handle); 4119 handle = NULL; 4120 mlog_errno(ret); 4121 goto out; 4122 } 4123 4124 for (i = 0; i < blk_per_bucket; i++) { 4125 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i], 4126 OCFS2_JOURNAL_ACCESS_WRITE); 4127 if (ret < 0) { 4128 mlog_errno(ret); 4129 goto out; 4130 } 4131 } 4132 4133 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, 4134 local, bucket_empty); 4135 4136 /*Only dirty the blocks we have touched in set xattr. */ 4137 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs, 4138 xs->bucket.bhs, blk_per_bucket); 4139 if (ret) 4140 mlog_errno(ret); 4141 out: 4142 ocfs2_commit_trans(osb, handle); 4143 4144 return ret; 4145 } 4146 4147 static int ocfs2_xattr_value_update_size(struct inode *inode, 4148 struct buffer_head *xe_bh, 4149 struct ocfs2_xattr_entry *xe, 4150 u64 new_size) 4151 { 4152 int ret; 4153 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4154 handle_t *handle = NULL; 4155 4156 handle = ocfs2_start_trans(osb, 1); 4157 if (handle == NULL) { 4158 ret = -ENOMEM; 4159 mlog_errno(ret); 4160 goto out; 4161 } 4162 4163 ret = ocfs2_journal_access(handle, inode, xe_bh, 4164 OCFS2_JOURNAL_ACCESS_WRITE); 4165 if (ret < 0) { 4166 mlog_errno(ret); 4167 goto out_commit; 4168 } 4169 4170 xe->xe_value_size = cpu_to_le64(new_size); 4171 4172 ret = ocfs2_journal_dirty(handle, xe_bh); 4173 if (ret < 0) 4174 mlog_errno(ret); 4175 4176 out_commit: 4177 ocfs2_commit_trans(osb, handle); 4178 out: 4179 return ret; 4180 } 4181 4182 /* 4183 * Truncate the specified xe_off entry in xattr bucket. 4184 * bucket is indicated by header_bh and len is the new length. 4185 * Both the ocfs2_xattr_value_root and the entry will be updated here. 4186 * 4187 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed. 4188 */ 4189 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode, 4190 struct buffer_head *header_bh, 4191 int xe_off, 4192 int len) 4193 { 4194 int ret, offset; 4195 u64 value_blk; 4196 struct buffer_head *value_bh = NULL; 4197 struct ocfs2_xattr_value_root *xv; 4198 struct ocfs2_xattr_entry *xe; 4199 struct ocfs2_xattr_header *xh = 4200 (struct ocfs2_xattr_header *)header_bh->b_data; 4201 size_t blocksize = inode->i_sb->s_blocksize; 4202 4203 xe = &xh->xh_entries[xe_off]; 4204 4205 BUG_ON(!xe || ocfs2_xattr_is_local(xe)); 4206 4207 offset = le16_to_cpu(xe->xe_name_offset) + 4208 OCFS2_XATTR_SIZE(xe->xe_name_len); 4209 4210 value_blk = offset / blocksize; 4211 4212 /* We don't allow ocfs2_xattr_value to be stored in different block. */ 4213 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize); 4214 value_blk += header_bh->b_blocknr; 4215 4216 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk, 4217 &value_bh, OCFS2_BH_CACHED, inode); 4218 if (ret) { 4219 mlog_errno(ret); 4220 goto out; 4221 } 4222 4223 xv = (struct ocfs2_xattr_value_root *) 4224 (value_bh->b_data + offset % blocksize); 4225 4226 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n", 4227 xe_off, (unsigned long long)header_bh->b_blocknr, len); 4228 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len); 4229 if (ret) { 4230 mlog_errno(ret); 4231 goto out; 4232 } 4233 4234 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len); 4235 if (ret) { 4236 mlog_errno(ret); 4237 goto out; 4238 } 4239 4240 out: 4241 brelse(value_bh); 4242 return ret; 4243 } 4244 4245 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode, 4246 struct ocfs2_xattr_search *xs, 4247 int len) 4248 { 4249 int ret, offset; 4250 struct ocfs2_xattr_entry *xe = xs->here; 4251 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base; 4252 4253 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe)); 4254 4255 offset = xe - xh->xh_entries; 4256 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0], 4257 offset, len); 4258 if (ret) 4259 mlog_errno(ret); 4260 4261 return ret; 4262 } 4263 4264 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode, 4265 struct ocfs2_xattr_search *xs, 4266 char *val, 4267 int value_len) 4268 { 4269 int offset; 4270 struct ocfs2_xattr_value_root *xv; 4271 struct ocfs2_xattr_entry *xe = xs->here; 4272 4273 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe)); 4274 4275 offset = le16_to_cpu(xe->xe_name_offset) + 4276 OCFS2_XATTR_SIZE(xe->xe_name_len); 4277 4278 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset); 4279 4280 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len); 4281 } 4282 4283 /* 4284 * Remove the xattr bucket pointed by bucket_bh. 4285 * All the buckets after it in the same xattr extent rec will be 4286 * move forward one by one. 4287 */ 4288 static int ocfs2_rm_xattr_bucket(struct inode *inode, 4289 struct buffer_head *first_bh, 4290 struct ocfs2_xattr_bucket *bucket) 4291 { 4292 int ret = 0, credits; 4293 struct ocfs2_xattr_header *xh = 4294 (struct ocfs2_xattr_header *)first_bh->b_data; 4295 u16 bucket_num = le16_to_cpu(xh->xh_num_buckets); 4296 u64 end, start = bucket->bhs[0]->b_blocknr; 4297 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4298 handle_t *handle; 4299 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4300 4301 end = first_bh->b_blocknr + (bucket_num - 1) * blk_per_bucket; 4302 4303 mlog(0, "rm xattr bucket %llu\n", start); 4304 /* 4305 * We need to update the first xattr_header and all the buckets starting 4306 * from start in this xattr rec. 4307 * 4308 * XXX: Should we empty the old last bucket here? 4309 */ 4310 credits = 1 + end - start; 4311 handle = ocfs2_start_trans(osb, credits); 4312 if (IS_ERR(handle)) { 4313 ret = PTR_ERR(handle); 4314 mlog_errno(ret); 4315 return ret; 4316 } 4317 4318 ret = ocfs2_journal_access(handle, inode, first_bh, 4319 OCFS2_JOURNAL_ACCESS_WRITE); 4320 if (ret) { 4321 mlog_errno(ret); 4322 goto out_commit; 4323 } 4324 4325 4326 while (start < end) { 4327 ret = ocfs2_cp_xattr_bucket(inode, handle, 4328 start + blk_per_bucket, 4329 start, 0); 4330 if (ret) { 4331 mlog_errno(ret); 4332 goto out_commit; 4333 } 4334 start += blk_per_bucket; 4335 } 4336 4337 /* update the first_bh. */ 4338 xh->xh_num_buckets = cpu_to_le16(bucket_num - 1); 4339 ocfs2_journal_dirty(handle, first_bh); 4340 4341 out_commit: 4342 ocfs2_commit_trans(osb, handle); 4343 return ret; 4344 } 4345 4346 static int ocfs2_rm_xattr_cluster(struct inode *inode, 4347 struct buffer_head *root_bh, 4348 u64 blkno, 4349 u32 cpos, 4350 u32 len) 4351 { 4352 int ret; 4353 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4354 struct inode *tl_inode = osb->osb_tl_inode; 4355 handle_t *handle; 4356 struct ocfs2_xattr_block *xb = 4357 (struct ocfs2_xattr_block *)root_bh->b_data; 4358 struct ocfs2_alloc_context *meta_ac = NULL; 4359 struct ocfs2_cached_dealloc_ctxt dealloc; 4360 struct ocfs2_extent_tree et; 4361 4362 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh); 4363 4364 ocfs2_init_dealloc_ctxt(&dealloc); 4365 4366 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n", 4367 cpos, len, (unsigned long long)blkno); 4368 4369 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len); 4370 4371 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac); 4372 if (ret) { 4373 mlog_errno(ret); 4374 return ret; 4375 } 4376 4377 mutex_lock(&tl_inode->i_mutex); 4378 4379 if (ocfs2_truncate_log_needs_flush(osb)) { 4380 ret = __ocfs2_flush_truncate_log(osb); 4381 if (ret < 0) { 4382 mlog_errno(ret); 4383 goto out; 4384 } 4385 } 4386 4387 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 4388 if (handle == NULL) { 4389 ret = -ENOMEM; 4390 mlog_errno(ret); 4391 goto out; 4392 } 4393 4394 ret = ocfs2_journal_access(handle, inode, root_bh, 4395 OCFS2_JOURNAL_ACCESS_WRITE); 4396 if (ret) { 4397 mlog_errno(ret); 4398 goto out_commit; 4399 } 4400 4401 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac, 4402 &dealloc); 4403 if (ret) { 4404 mlog_errno(ret); 4405 goto out_commit; 4406 } 4407 4408 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len); 4409 4410 ret = ocfs2_journal_dirty(handle, root_bh); 4411 if (ret) { 4412 mlog_errno(ret); 4413 goto out_commit; 4414 } 4415 4416 ret = ocfs2_truncate_log_append(osb, handle, blkno, len); 4417 if (ret) 4418 mlog_errno(ret); 4419 4420 out_commit: 4421 ocfs2_commit_trans(osb, handle); 4422 out: 4423 ocfs2_schedule_truncate_log_flush(osb, 1); 4424 4425 mutex_unlock(&tl_inode->i_mutex); 4426 4427 if (meta_ac) 4428 ocfs2_free_alloc_context(meta_ac); 4429 4430 ocfs2_run_deallocs(osb, &dealloc); 4431 4432 return ret; 4433 } 4434 4435 /* 4436 * Free the xattr bucket indicated by xs->bucket and if all the buckets 4437 * in the clusters is free, free the clusters also. 4438 */ 4439 static int ocfs2_xattr_bucket_shrink(struct inode *inode, 4440 struct ocfs2_xattr_info *xi, 4441 struct ocfs2_xattr_search *xs, 4442 u32 name_hash) 4443 { 4444 int ret; 4445 u32 e_cpos, num_clusters; 4446 u64 p_blkno; 4447 struct buffer_head *first_bh = NULL; 4448 struct ocfs2_xattr_header *first_xh; 4449 struct ocfs2_xattr_block *xb = 4450 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 4451 4452 BUG_ON(xs->header->xh_count != 0); 4453 4454 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4455 &e_cpos, &num_clusters, 4456 &xb->xb_attrs.xb_root.xt_list); 4457 if (ret) { 4458 mlog_errno(ret); 4459 return ret; 4460 } 4461 4462 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, 4463 &first_bh, OCFS2_BH_CACHED, inode); 4464 if (ret) { 4465 mlog_errno(ret); 4466 return ret; 4467 } 4468 4469 ret = ocfs2_rm_xattr_bucket(inode, first_bh, &xs->bucket); 4470 if (ret) { 4471 mlog_errno(ret); 4472 goto out; 4473 } 4474 4475 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 4476 if (first_xh->xh_num_buckets == 0) 4477 ret = ocfs2_rm_xattr_cluster(inode, xs->xattr_bh, 4478 p_blkno, e_cpos, 4479 num_clusters); 4480 4481 out: 4482 brelse(first_bh); 4483 return ret; 4484 } 4485 4486 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode, 4487 struct ocfs2_xattr_search *xs) 4488 { 4489 handle_t *handle = NULL; 4490 struct ocfs2_xattr_header *xh = xs->bucket.xh; 4491 struct ocfs2_xattr_entry *last = &xh->xh_entries[ 4492 le16_to_cpu(xh->xh_count) - 1]; 4493 int ret = 0; 4494 4495 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1); 4496 if (IS_ERR(handle)) { 4497 ret = PTR_ERR(handle); 4498 mlog_errno(ret); 4499 return; 4500 } 4501 4502 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0], 4503 OCFS2_JOURNAL_ACCESS_WRITE); 4504 if (ret) { 4505 mlog_errno(ret); 4506 goto out_commit; 4507 } 4508 4509 /* Remove the old entry. */ 4510 memmove(xs->here, xs->here + 1, 4511 (void *)last - (void *)xs->here); 4512 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 4513 le16_add_cpu(&xh->xh_count, -1); 4514 4515 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]); 4516 if (ret < 0) 4517 mlog_errno(ret); 4518 out_commit: 4519 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 4520 } 4521 4522 /* 4523 * Set the xattr name/value in the bucket specified in xs. 4524 * 4525 * As the new value in xi may be stored in the bucket or in an outside cluster, 4526 * we divide the whole process into 3 steps: 4527 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket) 4528 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs) 4529 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside) 4530 * 4. If the clusters for the new outside value can't be allocated, we need 4531 * to free the xattr we allocated in set. 4532 */ 4533 static int ocfs2_xattr_set_in_bucket(struct inode *inode, 4534 struct ocfs2_xattr_info *xi, 4535 struct ocfs2_xattr_search *xs) 4536 { 4537 int ret, local = 1, bucket_empty = 0; 4538 size_t value_len; 4539 char *val = (char *)xi->value; 4540 struct ocfs2_xattr_entry *xe = xs->here; 4541 u32 name_hash = ocfs2_xattr_hash_by_name(inode, 4542 xi->name_index, xi->name); 4543 4544 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) { 4545 /* 4546 * We need to truncate the xattr storage first. 4547 * 4548 * If both the old and new value are stored to 4549 * outside block, we only need to truncate 4550 * the storage and then set the value outside. 4551 * 4552 * If the new value should be stored within block, 4553 * we should free all the outside block first and 4554 * the modification to the xattr block will be done 4555 * by following steps. 4556 */ 4557 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4558 value_len = xi->value_len; 4559 else 4560 value_len = 0; 4561 4562 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4563 value_len); 4564 if (ret) 4565 goto out; 4566 4567 if (value_len) 4568 goto set_value_outside; 4569 } 4570 4571 value_len = xi->value_len; 4572 /* So we have to handle the inside block change now. */ 4573 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4574 /* 4575 * If the new value will be stored outside of block, 4576 * initalize a new empty value root and insert it first. 4577 */ 4578 local = 0; 4579 xi->value = &def_xv; 4580 xi->value_len = OCFS2_XATTR_ROOT_SIZE; 4581 } 4582 4583 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, 4584 local, &bucket_empty); 4585 if (ret) { 4586 mlog_errno(ret); 4587 goto out; 4588 } 4589 4590 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4591 /* allocate the space now for the outside block storage. */ 4592 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4593 value_len); 4594 if (ret) { 4595 mlog_errno(ret); 4596 4597 if (xs->not_found) { 4598 /* 4599 * We can't allocate enough clusters for outside 4600 * storage and we have allocated xattr already, 4601 * so need to remove it. 4602 */ 4603 ocfs2_xattr_bucket_remove_xs(inode, xs); 4604 } 4605 goto out; 4606 } 4607 } else { 4608 if (bucket_empty) 4609 ret = ocfs2_xattr_bucket_shrink(inode, xi, 4610 xs, name_hash); 4611 goto out; 4612 } 4613 4614 set_value_outside: 4615 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len); 4616 out: 4617 return ret; 4618 } 4619 4620 /* check whether the xattr bucket is filled up with the same hash value. */ 4621 static int ocfs2_check_xattr_bucket_collision(struct inode *inode, 4622 struct ocfs2_xattr_bucket *bucket) 4623 { 4624 struct ocfs2_xattr_header *xh = bucket->xh; 4625 4626 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash == 4627 xh->xh_entries[0].xe_name_hash) { 4628 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, " 4629 "hash = %u\n", 4630 (unsigned long long)bucket->bhs[0]->b_blocknr, 4631 le32_to_cpu(xh->xh_entries[0].xe_name_hash)); 4632 return -ENOSPC; 4633 } 4634 4635 return 0; 4636 } 4637 4638 static int ocfs2_xattr_set_entry_index_block(struct inode *inode, 4639 struct ocfs2_xattr_info *xi, 4640 struct ocfs2_xattr_search *xs) 4641 { 4642 struct ocfs2_xattr_header *xh; 4643 struct ocfs2_xattr_entry *xe; 4644 u16 count, header_size, xh_free_start; 4645 int i, free, max_free, need, old; 4646 size_t value_size = 0, name_len = strlen(xi->name); 4647 size_t blocksize = inode->i_sb->s_blocksize; 4648 int ret, allocation = 0; 4649 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4650 4651 mlog_entry("Set xattr %s in xattr index block\n", xi->name); 4652 4653 try_again: 4654 xh = xs->header; 4655 count = le16_to_cpu(xh->xh_count); 4656 xh_free_start = le16_to_cpu(xh->xh_free_start); 4657 header_size = sizeof(struct ocfs2_xattr_header) + 4658 count * sizeof(struct ocfs2_xattr_entry); 4659 max_free = OCFS2_XATTR_BUCKET_SIZE - 4660 le16_to_cpu(xh->xh_name_value_len) - header_size; 4661 4662 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size " 4663 "of %u which exceed block size\n", 4664 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4665 header_size); 4666 4667 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4668 value_size = OCFS2_XATTR_ROOT_SIZE; 4669 else if (xi->value) 4670 value_size = OCFS2_XATTR_SIZE(xi->value_len); 4671 4672 if (xs->not_found) 4673 need = sizeof(struct ocfs2_xattr_entry) + 4674 OCFS2_XATTR_SIZE(name_len) + value_size; 4675 else { 4676 need = value_size + OCFS2_XATTR_SIZE(name_len); 4677 4678 /* 4679 * We only replace the old value if the new length is smaller 4680 * than the old one. Otherwise we will allocate new space in the 4681 * bucket to store it. 4682 */ 4683 xe = xs->here; 4684 if (ocfs2_xattr_is_local(xe)) 4685 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 4686 else 4687 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 4688 4689 if (old >= value_size) 4690 need = 0; 4691 } 4692 4693 free = xh_free_start - header_size; 4694 /* 4695 * We need to make sure the new name/value pair 4696 * can exist in the same block. 4697 */ 4698 if (xh_free_start % blocksize < need) 4699 free -= xh_free_start % blocksize; 4700 4701 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, " 4702 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len =" 4703 " %u\n", xs->not_found, 4704 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4705 free, need, max_free, le16_to_cpu(xh->xh_free_start), 4706 le16_to_cpu(xh->xh_name_value_len)); 4707 4708 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4709 if (need <= max_free && 4710 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4711 /* 4712 * We can create the space by defragment. Since only the 4713 * name/value will be moved, the xe shouldn't be changed 4714 * in xs. 4715 */ 4716 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket); 4717 if (ret) { 4718 mlog_errno(ret); 4719 goto out; 4720 } 4721 4722 xh_free_start = le16_to_cpu(xh->xh_free_start); 4723 free = xh_free_start - header_size; 4724 if (xh_free_start % blocksize < need) 4725 free -= xh_free_start % blocksize; 4726 4727 if (free >= need) 4728 goto xattr_set; 4729 4730 mlog(0, "Can't get enough space for xattr insert by " 4731 "defragment. Need %u bytes, but we have %d, so " 4732 "allocate new bucket for it.\n", need, free); 4733 } 4734 4735 /* 4736 * We have to add new buckets or clusters and one 4737 * allocation should leave us enough space for insert. 4738 */ 4739 BUG_ON(allocation); 4740 4741 /* 4742 * We do not allow for overlapping ranges between buckets. And 4743 * the maximum number of collisions we will allow for then is 4744 * one bucket's worth, so check it here whether we need to 4745 * add a new bucket for the insert. 4746 */ 4747 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket); 4748 if (ret) { 4749 mlog_errno(ret); 4750 goto out; 4751 } 4752 4753 ret = ocfs2_add_new_xattr_bucket(inode, 4754 xs->xattr_bh, 4755 xs->bucket.bhs[0]); 4756 if (ret) { 4757 mlog_errno(ret); 4758 goto out; 4759 } 4760 4761 for (i = 0; i < blk_per_bucket; i++) 4762 brelse(xs->bucket.bhs[i]); 4763 4764 memset(&xs->bucket, 0, sizeof(xs->bucket)); 4765 4766 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh, 4767 xi->name_index, 4768 xi->name, xs); 4769 if (ret && ret != -ENODATA) 4770 goto out; 4771 xs->not_found = ret; 4772 allocation = 1; 4773 goto try_again; 4774 } 4775 4776 xattr_set: 4777 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs); 4778 out: 4779 mlog_exit(ret); 4780 return ret; 4781 } 4782 4783 static int ocfs2_delete_xattr_in_bucket(struct inode *inode, 4784 struct ocfs2_xattr_bucket *bucket, 4785 void *para) 4786 { 4787 int ret = 0; 4788 struct ocfs2_xattr_header *xh = bucket->xh; 4789 u16 i; 4790 struct ocfs2_xattr_entry *xe; 4791 4792 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 4793 xe = &xh->xh_entries[i]; 4794 if (ocfs2_xattr_is_local(xe)) 4795 continue; 4796 4797 ret = ocfs2_xattr_bucket_value_truncate(inode, 4798 bucket->bhs[0], 4799 i, 0); 4800 if (ret) { 4801 mlog_errno(ret); 4802 break; 4803 } 4804 } 4805 4806 return ret; 4807 } 4808 4809 static int ocfs2_delete_xattr_index_block(struct inode *inode, 4810 struct buffer_head *xb_bh) 4811 { 4812 struct ocfs2_xattr_block *xb = 4813 (struct ocfs2_xattr_block *)xb_bh->b_data; 4814 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 4815 int ret = 0; 4816 u32 name_hash = UINT_MAX, e_cpos, num_clusters; 4817 u64 p_blkno; 4818 4819 if (le16_to_cpu(el->l_next_free_rec) == 0) 4820 return 0; 4821 4822 while (name_hash > 0) { 4823 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4824 &e_cpos, &num_clusters, el); 4825 if (ret) { 4826 mlog_errno(ret); 4827 goto out; 4828 } 4829 4830 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 4831 ocfs2_delete_xattr_in_bucket, 4832 NULL); 4833 if (ret) { 4834 mlog_errno(ret); 4835 goto out; 4836 } 4837 4838 ret = ocfs2_rm_xattr_cluster(inode, xb_bh, 4839 p_blkno, e_cpos, num_clusters); 4840 if (ret) { 4841 mlog_errno(ret); 4842 break; 4843 } 4844 4845 if (e_cpos == 0) 4846 break; 4847 4848 name_hash = e_cpos - 1; 4849 } 4850 4851 out: 4852 return ret; 4853 } 4854