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 struct ocfs2_extent_list *root_el = &xv->xr_list; 210 u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters); 211 212 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add); 213 214 restart_all: 215 216 status = ocfs2_lock_allocators(inode, xattr_bh, root_el, 217 clusters_to_add, 0, &data_ac, 218 &meta_ac, OCFS2_XATTR_VALUE_EXTENT, xv); 219 if (status) { 220 mlog_errno(status); 221 goto leave; 222 } 223 224 credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add); 225 handle = ocfs2_start_trans(osb, credits); 226 if (IS_ERR(handle)) { 227 status = PTR_ERR(handle); 228 handle = NULL; 229 mlog_errno(status); 230 goto leave; 231 } 232 233 restarted_transaction: 234 status = ocfs2_journal_access(handle, inode, xattr_bh, 235 OCFS2_JOURNAL_ACCESS_WRITE); 236 if (status < 0) { 237 mlog_errno(status); 238 goto leave; 239 } 240 241 prev_clusters = le32_to_cpu(xv->xr_clusters); 242 status = ocfs2_add_clusters_in_btree(osb, 243 inode, 244 &logical_start, 245 clusters_to_add, 246 0, 247 xattr_bh, 248 root_el, 249 handle, 250 data_ac, 251 meta_ac, 252 &why, 253 OCFS2_XATTR_VALUE_EXTENT, 254 xv); 255 if ((status < 0) && (status != -EAGAIN)) { 256 if (status != -ENOSPC) 257 mlog_errno(status); 258 goto leave; 259 } 260 261 status = ocfs2_journal_dirty(handle, xattr_bh); 262 if (status < 0) { 263 mlog_errno(status); 264 goto leave; 265 } 266 267 clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters; 268 269 if (why != RESTART_NONE && clusters_to_add) { 270 if (why == RESTART_META) { 271 mlog(0, "restarting function.\n"); 272 restart_func = 1; 273 } else { 274 BUG_ON(why != RESTART_TRANS); 275 276 mlog(0, "restarting transaction.\n"); 277 /* TODO: This can be more intelligent. */ 278 credits = ocfs2_calc_extend_credits(osb->sb, 279 root_el, 280 clusters_to_add); 281 status = ocfs2_extend_trans(handle, credits); 282 if (status < 0) { 283 /* handle still has to be committed at 284 * this point. */ 285 status = -ENOMEM; 286 mlog_errno(status); 287 goto leave; 288 } 289 goto restarted_transaction; 290 } 291 } 292 293 leave: 294 if (handle) { 295 ocfs2_commit_trans(osb, handle); 296 handle = NULL; 297 } 298 if (data_ac) { 299 ocfs2_free_alloc_context(data_ac); 300 data_ac = NULL; 301 } 302 if (meta_ac) { 303 ocfs2_free_alloc_context(meta_ac); 304 meta_ac = NULL; 305 } 306 if ((!status) && restart_func) { 307 restart_func = 0; 308 goto restart_all; 309 } 310 311 return status; 312 } 313 314 static int __ocfs2_remove_xattr_range(struct inode *inode, 315 struct buffer_head *root_bh, 316 struct ocfs2_xattr_value_root *xv, 317 u32 cpos, u32 phys_cpos, u32 len, 318 struct ocfs2_cached_dealloc_ctxt *dealloc) 319 { 320 int ret; 321 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); 322 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 323 struct inode *tl_inode = osb->osb_tl_inode; 324 handle_t *handle; 325 struct ocfs2_alloc_context *meta_ac = NULL; 326 327 ret = ocfs2_lock_allocators(inode, root_bh, &xv->xr_list, 328 0, 1, NULL, &meta_ac, 329 OCFS2_XATTR_VALUE_EXTENT, xv); 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, root_bh, cpos, len, handle, meta_ac, 360 dealloc, OCFS2_XATTR_VALUE_EXTENT, xv); 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 attribue in external blcok*/ 1340 ret = ocfs2_extend_trans(handle, 1341 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1342 if (ret) { 1343 mlog_errno(ret); 1344 goto out_commit; 1345 } 1346 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1347 OCFS2_JOURNAL_ACCESS_WRITE); 1348 if (ret) { 1349 mlog_errno(ret); 1350 goto out_commit; 1351 } 1352 } 1353 1354 /* 1355 * Set value in local, include set tree root in local. 1356 * This is the first step for value size >INLINE_SIZE. 1357 */ 1358 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs); 1359 1360 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1361 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1362 if (ret < 0) { 1363 mlog_errno(ret); 1364 goto out_commit; 1365 } 1366 } 1367 1368 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) && 1369 (flag & OCFS2_INLINE_XATTR_FL)) { 1370 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1371 unsigned int xattrsize = osb->s_xattr_inline_size; 1372 1373 /* 1374 * Adjust extent record count or inline data size 1375 * to reserve space for extended attribute. 1376 */ 1377 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1378 struct ocfs2_inline_data *idata = &di->id2.i_data; 1379 le16_add_cpu(&idata->id_count, -xattrsize); 1380 } else if (!(ocfs2_inode_is_fast_symlink(inode))) { 1381 struct ocfs2_extent_list *el = &di->id2.i_list; 1382 le16_add_cpu(&el->l_count, -(xattrsize / 1383 sizeof(struct ocfs2_extent_rec))); 1384 } 1385 di->i_xattr_inline_size = cpu_to_le16(xattrsize); 1386 } 1387 /* Update xattr flag */ 1388 spin_lock(&oi->ip_lock); 1389 oi->ip_dyn_features |= flag; 1390 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1391 spin_unlock(&oi->ip_lock); 1392 /* Update inode ctime */ 1393 inode->i_ctime = CURRENT_TIME; 1394 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); 1395 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 1396 1397 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1398 if (ret < 0) 1399 mlog_errno(ret); 1400 1401 out_commit: 1402 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1403 1404 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1405 /* 1406 * Set value outside in B tree. 1407 * This is the second step for value size > INLINE_SIZE. 1408 */ 1409 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1410 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs); 1411 if (ret < 0) { 1412 int ret2; 1413 1414 mlog_errno(ret); 1415 /* 1416 * If set value outside failed, we have to clean 1417 * the junk tree root we have already set in local. 1418 */ 1419 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs); 1420 if (ret2 < 0) 1421 mlog_errno(ret2); 1422 } 1423 } 1424 out: 1425 return ret; 1426 1427 } 1428 1429 static int ocfs2_xattr_free_block(handle_t *handle, 1430 struct ocfs2_super *osb, 1431 struct ocfs2_xattr_block *xb) 1432 { 1433 struct inode *xb_alloc_inode; 1434 struct buffer_head *xb_alloc_bh = NULL; 1435 u64 blk = le64_to_cpu(xb->xb_blkno); 1436 u16 bit = le16_to_cpu(xb->xb_suballoc_bit); 1437 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit); 1438 int ret = 0; 1439 1440 xb_alloc_inode = ocfs2_get_system_file_inode(osb, 1441 EXTENT_ALLOC_SYSTEM_INODE, 1442 le16_to_cpu(xb->xb_suballoc_slot)); 1443 if (!xb_alloc_inode) { 1444 ret = -ENOMEM; 1445 mlog_errno(ret); 1446 goto out; 1447 } 1448 mutex_lock(&xb_alloc_inode->i_mutex); 1449 1450 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1); 1451 if (ret < 0) { 1452 mlog_errno(ret); 1453 goto out_mutex; 1454 } 1455 ret = ocfs2_extend_trans(handle, OCFS2_SUBALLOC_FREE); 1456 if (ret < 0) { 1457 mlog_errno(ret); 1458 goto out_unlock; 1459 } 1460 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh, 1461 bit, bg_blkno, 1); 1462 if (ret < 0) 1463 mlog_errno(ret); 1464 out_unlock: 1465 ocfs2_inode_unlock(xb_alloc_inode, 1); 1466 brelse(xb_alloc_bh); 1467 out_mutex: 1468 mutex_unlock(&xb_alloc_inode->i_mutex); 1469 iput(xb_alloc_inode); 1470 out: 1471 return ret; 1472 } 1473 1474 static int ocfs2_remove_value_outside(struct inode*inode, 1475 struct buffer_head *bh, 1476 struct ocfs2_xattr_header *header) 1477 { 1478 int ret = 0, i; 1479 1480 for (i = 0; i < le16_to_cpu(header->xh_count); i++) { 1481 struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; 1482 1483 if (!ocfs2_xattr_is_local(entry)) { 1484 struct ocfs2_xattr_value_root *xv; 1485 void *val; 1486 1487 val = (void *)header + 1488 le16_to_cpu(entry->xe_name_offset); 1489 xv = (struct ocfs2_xattr_value_root *) 1490 (val + OCFS2_XATTR_SIZE(entry->xe_name_len)); 1491 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0); 1492 if (ret < 0) { 1493 mlog_errno(ret); 1494 return ret; 1495 } 1496 } 1497 } 1498 1499 return ret; 1500 } 1501 1502 static int ocfs2_xattr_ibody_remove(struct inode *inode, 1503 struct buffer_head *di_bh) 1504 { 1505 1506 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1507 struct ocfs2_xattr_header *header; 1508 int ret; 1509 1510 header = (struct ocfs2_xattr_header *) 1511 ((void *)di + inode->i_sb->s_blocksize - 1512 le16_to_cpu(di->i_xattr_inline_size)); 1513 1514 ret = ocfs2_remove_value_outside(inode, di_bh, header); 1515 1516 return ret; 1517 } 1518 1519 static int ocfs2_xattr_block_remove(struct inode *inode, 1520 struct buffer_head *blk_bh) 1521 { 1522 struct ocfs2_xattr_block *xb; 1523 int ret = 0; 1524 1525 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1526 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1527 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header); 1528 ret = ocfs2_remove_value_outside(inode, blk_bh, header); 1529 } else 1530 ret = ocfs2_delete_xattr_index_block(inode, blk_bh); 1531 1532 return ret; 1533 } 1534 1535 /* 1536 * ocfs2_xattr_remove() 1537 * 1538 * Free extended attribute resources associated with this inode. 1539 */ 1540 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh) 1541 { 1542 struct ocfs2_xattr_block *xb; 1543 struct buffer_head *blk_bh = NULL; 1544 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1545 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1546 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1547 handle_t *handle; 1548 int ret; 1549 1550 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 1551 return 0; 1552 1553 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 1554 return 0; 1555 1556 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1557 ret = ocfs2_xattr_ibody_remove(inode, di_bh); 1558 if (ret < 0) { 1559 mlog_errno(ret); 1560 goto out; 1561 } 1562 } 1563 if (di->i_xattr_loc) { 1564 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1565 le64_to_cpu(di->i_xattr_loc), 1566 &blk_bh, OCFS2_BH_CACHED, inode); 1567 if (ret < 0) { 1568 mlog_errno(ret); 1569 return ret; 1570 } 1571 /*Verify the signature of xattr block*/ 1572 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 1573 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 1574 ret = -EFAULT; 1575 goto out; 1576 } 1577 1578 ret = ocfs2_xattr_block_remove(inode, blk_bh); 1579 if (ret < 0) { 1580 mlog_errno(ret); 1581 goto out; 1582 } 1583 } 1584 1585 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1586 OCFS2_INODE_UPDATE_CREDITS); 1587 if (IS_ERR(handle)) { 1588 ret = PTR_ERR(handle); 1589 mlog_errno(ret); 1590 goto out; 1591 } 1592 ret = ocfs2_journal_access(handle, inode, di_bh, 1593 OCFS2_JOURNAL_ACCESS_WRITE); 1594 if (ret) { 1595 mlog_errno(ret); 1596 goto out_commit; 1597 } 1598 1599 if (di->i_xattr_loc) { 1600 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1601 ocfs2_xattr_free_block(handle, osb, xb); 1602 di->i_xattr_loc = cpu_to_le64(0); 1603 } 1604 1605 spin_lock(&oi->ip_lock); 1606 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL); 1607 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1608 spin_unlock(&oi->ip_lock); 1609 1610 ret = ocfs2_journal_dirty(handle, di_bh); 1611 if (ret < 0) 1612 mlog_errno(ret); 1613 out_commit: 1614 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1615 out: 1616 brelse(blk_bh); 1617 1618 return ret; 1619 } 1620 1621 static int ocfs2_xattr_has_space_inline(struct inode *inode, 1622 struct ocfs2_dinode *di) 1623 { 1624 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1625 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size; 1626 int free; 1627 1628 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE) 1629 return 0; 1630 1631 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1632 struct ocfs2_inline_data *idata = &di->id2.i_data; 1633 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size); 1634 } else if (ocfs2_inode_is_fast_symlink(inode)) { 1635 free = ocfs2_fast_symlink_chars(inode->i_sb) - 1636 le64_to_cpu(di->i_size); 1637 } else { 1638 struct ocfs2_extent_list *el = &di->id2.i_list; 1639 free = (le16_to_cpu(el->l_count) - 1640 le16_to_cpu(el->l_next_free_rec)) * 1641 sizeof(struct ocfs2_extent_rec); 1642 } 1643 if (free >= xattrsize) 1644 return 1; 1645 1646 return 0; 1647 } 1648 1649 /* 1650 * ocfs2_xattr_ibody_find() 1651 * 1652 * Find extended attribute in inode block and 1653 * fill search info into struct ocfs2_xattr_search. 1654 */ 1655 static int ocfs2_xattr_ibody_find(struct inode *inode, 1656 int name_index, 1657 const char *name, 1658 struct ocfs2_xattr_search *xs) 1659 { 1660 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1661 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1662 int ret; 1663 int has_space = 0; 1664 1665 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1666 return 0; 1667 1668 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1669 down_read(&oi->ip_alloc_sem); 1670 has_space = ocfs2_xattr_has_space_inline(inode, di); 1671 up_read(&oi->ip_alloc_sem); 1672 if (!has_space) 1673 return 0; 1674 } 1675 1676 xs->xattr_bh = xs->inode_bh; 1677 xs->end = (void *)di + inode->i_sb->s_blocksize; 1678 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) 1679 xs->header = (struct ocfs2_xattr_header *) 1680 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 1681 else 1682 xs->header = (struct ocfs2_xattr_header *) 1683 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size); 1684 xs->base = (void *)xs->header; 1685 xs->here = xs->header->xh_entries; 1686 1687 /* Find the named attribute. */ 1688 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1689 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1690 if (ret && ret != -ENODATA) 1691 return ret; 1692 xs->not_found = ret; 1693 } 1694 1695 return 0; 1696 } 1697 1698 /* 1699 * ocfs2_xattr_ibody_set() 1700 * 1701 * Set, replace or remove an extended attribute into inode block. 1702 * 1703 */ 1704 static int ocfs2_xattr_ibody_set(struct inode *inode, 1705 struct ocfs2_xattr_info *xi, 1706 struct ocfs2_xattr_search *xs) 1707 { 1708 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1709 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1710 int ret; 1711 1712 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1713 return -ENOSPC; 1714 1715 down_write(&oi->ip_alloc_sem); 1716 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1717 if (!ocfs2_xattr_has_space_inline(inode, di)) { 1718 ret = -ENOSPC; 1719 goto out; 1720 } 1721 } 1722 1723 ret = ocfs2_xattr_set_entry(inode, xi, xs, 1724 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL)); 1725 out: 1726 up_write(&oi->ip_alloc_sem); 1727 1728 return ret; 1729 } 1730 1731 /* 1732 * ocfs2_xattr_block_find() 1733 * 1734 * Find extended attribute in external block and 1735 * fill search info into struct ocfs2_xattr_search. 1736 */ 1737 static int ocfs2_xattr_block_find(struct inode *inode, 1738 int name_index, 1739 const char *name, 1740 struct ocfs2_xattr_search *xs) 1741 { 1742 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1743 struct buffer_head *blk_bh = NULL; 1744 struct ocfs2_xattr_block *xb; 1745 int ret = 0; 1746 1747 if (!di->i_xattr_loc) 1748 return ret; 1749 1750 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1751 le64_to_cpu(di->i_xattr_loc), 1752 &blk_bh, OCFS2_BH_CACHED, inode); 1753 if (ret < 0) { 1754 mlog_errno(ret); 1755 return ret; 1756 } 1757 /*Verify the signature of xattr block*/ 1758 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 1759 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 1760 ret = -EFAULT; 1761 goto cleanup; 1762 } 1763 1764 xs->xattr_bh = blk_bh; 1765 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1766 1767 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1768 xs->header = &xb->xb_attrs.xb_header; 1769 xs->base = (void *)xs->header; 1770 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 1771 xs->here = xs->header->xh_entries; 1772 1773 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1774 } else 1775 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 1776 name_index, 1777 name, xs); 1778 1779 if (ret && ret != -ENODATA) { 1780 xs->xattr_bh = NULL; 1781 goto cleanup; 1782 } 1783 xs->not_found = ret; 1784 return 0; 1785 cleanup: 1786 brelse(blk_bh); 1787 1788 return ret; 1789 } 1790 1791 /* 1792 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree 1793 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header 1794 * re-initialized. 1795 */ 1796 static int ocfs2_restore_xattr_block(struct inode *inode, 1797 struct ocfs2_xattr_search *xs) 1798 { 1799 int ret; 1800 handle_t *handle; 1801 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1802 struct ocfs2_xattr_block *xb = 1803 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1804 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 1805 u16 xb_flags = le16_to_cpu(xb->xb_flags); 1806 1807 BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) || 1808 le16_to_cpu(el->l_next_free_rec) != 0); 1809 1810 handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1811 if (IS_ERR(handle)) { 1812 ret = PTR_ERR(handle); 1813 handle = NULL; 1814 goto out; 1815 } 1816 1817 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1818 OCFS2_JOURNAL_ACCESS_WRITE); 1819 if (ret < 0) { 1820 mlog_errno(ret); 1821 goto out_commit; 1822 } 1823 1824 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 1825 offsetof(struct ocfs2_xattr_block, xb_attrs)); 1826 1827 xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED); 1828 1829 ocfs2_journal_dirty(handle, xs->xattr_bh); 1830 1831 out_commit: 1832 ocfs2_commit_trans(osb, handle); 1833 out: 1834 return ret; 1835 } 1836 1837 /* 1838 * ocfs2_xattr_block_set() 1839 * 1840 * Set, replace or remove an extended attribute into external block. 1841 * 1842 */ 1843 static int ocfs2_xattr_block_set(struct inode *inode, 1844 struct ocfs2_xattr_info *xi, 1845 struct ocfs2_xattr_search *xs) 1846 { 1847 struct buffer_head *new_bh = NULL; 1848 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1849 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1850 struct ocfs2_alloc_context *meta_ac = NULL; 1851 handle_t *handle = NULL; 1852 struct ocfs2_xattr_block *xblk = NULL; 1853 u16 suballoc_bit_start; 1854 u32 num_got; 1855 u64 first_blkno; 1856 int ret; 1857 1858 if (!xs->xattr_bh) { 1859 /* 1860 * Alloc one external block for extended attribute 1861 * outside of inode. 1862 */ 1863 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); 1864 if (ret < 0) { 1865 mlog_errno(ret); 1866 goto out; 1867 } 1868 handle = ocfs2_start_trans(osb, 1869 OCFS2_XATTR_BLOCK_CREATE_CREDITS); 1870 if (IS_ERR(handle)) { 1871 ret = PTR_ERR(handle); 1872 mlog_errno(ret); 1873 goto out; 1874 } 1875 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1876 OCFS2_JOURNAL_ACCESS_CREATE); 1877 if (ret < 0) { 1878 mlog_errno(ret); 1879 goto out_commit; 1880 } 1881 1882 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, 1883 &suballoc_bit_start, &num_got, 1884 &first_blkno); 1885 if (ret < 0) { 1886 mlog_errno(ret); 1887 goto out_commit; 1888 } 1889 1890 new_bh = sb_getblk(inode->i_sb, first_blkno); 1891 ocfs2_set_new_buffer_uptodate(inode, new_bh); 1892 1893 ret = ocfs2_journal_access(handle, inode, new_bh, 1894 OCFS2_JOURNAL_ACCESS_CREATE); 1895 if (ret < 0) { 1896 mlog_errno(ret); 1897 goto out_commit; 1898 } 1899 1900 /* Initialize ocfs2_xattr_block */ 1901 xs->xattr_bh = new_bh; 1902 xblk = (struct ocfs2_xattr_block *)new_bh->b_data; 1903 memset(xblk, 0, inode->i_sb->s_blocksize); 1904 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE); 1905 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num); 1906 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start); 1907 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation); 1908 xblk->xb_blkno = cpu_to_le64(first_blkno); 1909 1910 xs->header = &xblk->xb_attrs.xb_header; 1911 xs->base = (void *)xs->header; 1912 xs->end = (void *)xblk + inode->i_sb->s_blocksize; 1913 xs->here = xs->header->xh_entries; 1914 1915 1916 ret = ocfs2_journal_dirty(handle, new_bh); 1917 if (ret < 0) { 1918 mlog_errno(ret); 1919 goto out_commit; 1920 } 1921 di->i_xattr_loc = cpu_to_le64(first_blkno); 1922 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1923 if (ret < 0) 1924 mlog_errno(ret); 1925 out_commit: 1926 ocfs2_commit_trans(osb, handle); 1927 out: 1928 if (meta_ac) 1929 ocfs2_free_alloc_context(meta_ac); 1930 if (ret < 0) 1931 return ret; 1932 } else 1933 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1934 1935 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) { 1936 /* Set extended attribute into external block */ 1937 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL); 1938 if (!ret || ret != -ENOSPC) 1939 goto end; 1940 1941 ret = ocfs2_xattr_create_index_block(inode, xs); 1942 if (ret) 1943 goto end; 1944 } 1945 1946 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs); 1947 if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0) 1948 ret = ocfs2_restore_xattr_block(inode, xs); 1949 1950 end: 1951 1952 return ret; 1953 } 1954 1955 /* 1956 * ocfs2_xattr_set() 1957 * 1958 * Set, replace or remove an extended attribute for this inode. 1959 * value is NULL to remove an existing extended attribute, else either 1960 * create or replace an extended attribute. 1961 */ 1962 int ocfs2_xattr_set(struct inode *inode, 1963 int name_index, 1964 const char *name, 1965 const void *value, 1966 size_t value_len, 1967 int flags) 1968 { 1969 struct buffer_head *di_bh = NULL; 1970 struct ocfs2_dinode *di; 1971 int ret; 1972 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 1973 1974 struct ocfs2_xattr_info xi = { 1975 .name_index = name_index, 1976 .name = name, 1977 .value = value, 1978 .value_len = value_len, 1979 }; 1980 1981 struct ocfs2_xattr_search xis = { 1982 .not_found = -ENODATA, 1983 }; 1984 1985 struct ocfs2_xattr_search xbs = { 1986 .not_found = -ENODATA, 1987 }; 1988 1989 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 1990 return -EOPNOTSUPP; 1991 1992 ret = ocfs2_inode_lock(inode, &di_bh, 1); 1993 if (ret < 0) { 1994 mlog_errno(ret); 1995 return ret; 1996 } 1997 xis.inode_bh = xbs.inode_bh = di_bh; 1998 di = (struct ocfs2_dinode *)di_bh->b_data; 1999 2000 down_write(&OCFS2_I(inode)->ip_xattr_sem); 2001 /* 2002 * Scan inode and external block to find the same name 2003 * extended attribute and collect search infomation. 2004 */ 2005 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis); 2006 if (ret) 2007 goto cleanup; 2008 if (xis.not_found) { 2009 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs); 2010 if (ret) 2011 goto cleanup; 2012 } 2013 2014 if (xis.not_found && xbs.not_found) { 2015 ret = -ENODATA; 2016 if (flags & XATTR_REPLACE) 2017 goto cleanup; 2018 ret = 0; 2019 if (!value) 2020 goto cleanup; 2021 } else { 2022 ret = -EEXIST; 2023 if (flags & XATTR_CREATE) 2024 goto cleanup; 2025 } 2026 2027 if (!value) { 2028 /* Remove existing extended attribute */ 2029 if (!xis.not_found) 2030 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2031 else if (!xbs.not_found) 2032 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2033 } else { 2034 /* We always try to set extended attribute into inode first*/ 2035 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2036 if (!ret && !xbs.not_found) { 2037 /* 2038 * If succeed and that extended attribute existing in 2039 * external block, then we will remove it. 2040 */ 2041 xi.value = NULL; 2042 xi.value_len = 0; 2043 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2044 } else if (ret == -ENOSPC) { 2045 if (di->i_xattr_loc && !xbs.xattr_bh) { 2046 ret = ocfs2_xattr_block_find(inode, name_index, 2047 name, &xbs); 2048 if (ret) 2049 goto cleanup; 2050 } 2051 /* 2052 * If no space in inode, we will set extended attribute 2053 * into external block. 2054 */ 2055 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2056 if (ret) 2057 goto cleanup; 2058 if (!xis.not_found) { 2059 /* 2060 * If succeed and that extended attribute 2061 * existing in inode, we will remove it. 2062 */ 2063 xi.value = NULL; 2064 xi.value_len = 0; 2065 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2066 } 2067 } 2068 } 2069 cleanup: 2070 up_write(&OCFS2_I(inode)->ip_xattr_sem); 2071 ocfs2_inode_unlock(inode, 1); 2072 brelse(di_bh); 2073 brelse(xbs.xattr_bh); 2074 for (i = 0; i < blk_per_bucket; i++) 2075 brelse(xbs.bucket.bhs[i]); 2076 2077 return ret; 2078 } 2079 2080 static inline u32 ocfs2_xattr_hash_by_name(struct inode *inode, 2081 int name_index, 2082 const char *suffix_name) 2083 { 2084 struct xattr_handler *handler = ocfs2_xattr_handler(name_index); 2085 char *prefix = handler->prefix; 2086 int prefix_len = strlen(handler->prefix); 2087 2088 return ocfs2_xattr_name_hash(inode, prefix, prefix_len, 2089 (char *)suffix_name, strlen(suffix_name)); 2090 } 2091 2092 /* 2093 * Find the xattr extent rec which may contains name_hash. 2094 * e_cpos will be the first name hash of the xattr rec. 2095 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list. 2096 */ 2097 static int ocfs2_xattr_get_rec(struct inode *inode, 2098 u32 name_hash, 2099 u64 *p_blkno, 2100 u32 *e_cpos, 2101 u32 *num_clusters, 2102 struct ocfs2_extent_list *el) 2103 { 2104 int ret = 0, i; 2105 struct buffer_head *eb_bh = NULL; 2106 struct ocfs2_extent_block *eb; 2107 struct ocfs2_extent_rec *rec = NULL; 2108 u64 e_blkno = 0; 2109 2110 if (el->l_tree_depth) { 2111 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh); 2112 if (ret) { 2113 mlog_errno(ret); 2114 goto out; 2115 } 2116 2117 eb = (struct ocfs2_extent_block *) eb_bh->b_data; 2118 el = &eb->h_list; 2119 2120 if (el->l_tree_depth) { 2121 ocfs2_error(inode->i_sb, 2122 "Inode %lu has non zero tree depth in " 2123 "xattr tree block %llu\n", inode->i_ino, 2124 (unsigned long long)eb_bh->b_blocknr); 2125 ret = -EROFS; 2126 goto out; 2127 } 2128 } 2129 2130 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { 2131 rec = &el->l_recs[i]; 2132 2133 if (le32_to_cpu(rec->e_cpos) <= name_hash) { 2134 e_blkno = le64_to_cpu(rec->e_blkno); 2135 break; 2136 } 2137 } 2138 2139 if (!e_blkno) { 2140 ocfs2_error(inode->i_sb, "Inode %lu has bad extent " 2141 "record (%u, %u, 0) in xattr", inode->i_ino, 2142 le32_to_cpu(rec->e_cpos), 2143 ocfs2_rec_clusters(el, rec)); 2144 ret = -EROFS; 2145 goto out; 2146 } 2147 2148 *p_blkno = le64_to_cpu(rec->e_blkno); 2149 *num_clusters = le16_to_cpu(rec->e_leaf_clusters); 2150 if (e_cpos) 2151 *e_cpos = le32_to_cpu(rec->e_cpos); 2152 out: 2153 brelse(eb_bh); 2154 return ret; 2155 } 2156 2157 typedef int (xattr_bucket_func)(struct inode *inode, 2158 struct ocfs2_xattr_bucket *bucket, 2159 void *para); 2160 2161 static int ocfs2_find_xe_in_bucket(struct inode *inode, 2162 struct buffer_head *header_bh, 2163 int name_index, 2164 const char *name, 2165 u32 name_hash, 2166 u16 *xe_index, 2167 int *found) 2168 { 2169 int i, ret = 0, cmp = 1, block_off, new_offset; 2170 struct ocfs2_xattr_header *xh = 2171 (struct ocfs2_xattr_header *)header_bh->b_data; 2172 size_t name_len = strlen(name); 2173 struct ocfs2_xattr_entry *xe = NULL; 2174 struct buffer_head *name_bh = NULL; 2175 char *xe_name; 2176 2177 /* 2178 * We don't use binary search in the bucket because there 2179 * may be multiple entries with the same name hash. 2180 */ 2181 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 2182 xe = &xh->xh_entries[i]; 2183 2184 if (name_hash > le32_to_cpu(xe->xe_name_hash)) 2185 continue; 2186 else if (name_hash < le32_to_cpu(xe->xe_name_hash)) 2187 break; 2188 2189 cmp = name_index - ocfs2_xattr_get_type(xe); 2190 if (!cmp) 2191 cmp = name_len - xe->xe_name_len; 2192 if (cmp) 2193 continue; 2194 2195 ret = ocfs2_xattr_bucket_get_name_value(inode, 2196 xh, 2197 i, 2198 &block_off, 2199 &new_offset); 2200 if (ret) { 2201 mlog_errno(ret); 2202 break; 2203 } 2204 2205 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 2206 header_bh->b_blocknr + block_off, 2207 &name_bh, OCFS2_BH_CACHED, inode); 2208 if (ret) { 2209 mlog_errno(ret); 2210 break; 2211 } 2212 xe_name = name_bh->b_data + new_offset; 2213 2214 cmp = memcmp(name, xe_name, name_len); 2215 brelse(name_bh); 2216 name_bh = NULL; 2217 2218 if (cmp == 0) { 2219 *xe_index = i; 2220 *found = 1; 2221 ret = 0; 2222 break; 2223 } 2224 } 2225 2226 return ret; 2227 } 2228 2229 /* 2230 * Find the specified xattr entry in a series of buckets. 2231 * This series start from p_blkno and last for num_clusters. 2232 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains 2233 * the num of the valid buckets. 2234 * 2235 * Return the buffer_head this xattr should reside in. And if the xattr's 2236 * hash is in the gap of 2 buckets, return the lower bucket. 2237 */ 2238 static int ocfs2_xattr_bucket_find(struct inode *inode, 2239 int name_index, 2240 const char *name, 2241 u32 name_hash, 2242 u64 p_blkno, 2243 u32 first_hash, 2244 u32 num_clusters, 2245 struct ocfs2_xattr_search *xs) 2246 { 2247 int ret, found = 0; 2248 struct buffer_head *bh = NULL; 2249 struct buffer_head *lower_bh = NULL; 2250 struct ocfs2_xattr_header *xh = NULL; 2251 struct ocfs2_xattr_entry *xe = NULL; 2252 u16 index = 0; 2253 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2254 int low_bucket = 0, bucket, high_bucket; 2255 u32 last_hash; 2256 u64 blkno; 2257 2258 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, 2259 &bh, OCFS2_BH_CACHED, inode); 2260 if (ret) { 2261 mlog_errno(ret); 2262 goto out; 2263 } 2264 2265 xh = (struct ocfs2_xattr_header *)bh->b_data; 2266 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1; 2267 2268 while (low_bucket <= high_bucket) { 2269 brelse(bh); 2270 bh = NULL; 2271 bucket = (low_bucket + high_bucket) / 2; 2272 2273 blkno = p_blkno + bucket * blk_per_bucket; 2274 2275 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 2276 &bh, OCFS2_BH_CACHED, inode); 2277 if (ret) { 2278 mlog_errno(ret); 2279 goto out; 2280 } 2281 2282 xh = (struct ocfs2_xattr_header *)bh->b_data; 2283 xe = &xh->xh_entries[0]; 2284 if (name_hash < le32_to_cpu(xe->xe_name_hash)) { 2285 high_bucket = bucket - 1; 2286 continue; 2287 } 2288 2289 /* 2290 * Check whether the hash of the last entry in our 2291 * bucket is larger than the search one. 2292 */ 2293 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1]; 2294 last_hash = le32_to_cpu(xe->xe_name_hash); 2295 2296 /* record lower_bh which may be the insert place. */ 2297 brelse(lower_bh); 2298 lower_bh = bh; 2299 bh = NULL; 2300 2301 if (name_hash > le32_to_cpu(xe->xe_name_hash)) { 2302 low_bucket = bucket + 1; 2303 continue; 2304 } 2305 2306 /* the searched xattr should reside in this bucket if exists. */ 2307 ret = ocfs2_find_xe_in_bucket(inode, lower_bh, 2308 name_index, name, name_hash, 2309 &index, &found); 2310 if (ret) { 2311 mlog_errno(ret); 2312 goto out; 2313 } 2314 break; 2315 } 2316 2317 /* 2318 * Record the bucket we have found. 2319 * When the xattr's hash value is in the gap of 2 buckets, we will 2320 * always set it to the previous bucket. 2321 */ 2322 if (!lower_bh) { 2323 /* 2324 * We can't find any bucket whose first name_hash is less 2325 * than the find name_hash. 2326 */ 2327 BUG_ON(bh->b_blocknr != p_blkno); 2328 lower_bh = bh; 2329 bh = NULL; 2330 } 2331 xs->bucket.bhs[0] = lower_bh; 2332 xs->bucket.xh = (struct ocfs2_xattr_header *) 2333 xs->bucket.bhs[0]->b_data; 2334 lower_bh = NULL; 2335 2336 xs->header = xs->bucket.xh; 2337 xs->base = xs->bucket.bhs[0]->b_data; 2338 xs->end = xs->base + inode->i_sb->s_blocksize; 2339 2340 if (found) { 2341 /* 2342 * If we have found the xattr enty, read all the blocks in 2343 * this bucket. 2344 */ 2345 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2346 xs->bucket.bhs[0]->b_blocknr + 1, 2347 blk_per_bucket - 1, &xs->bucket.bhs[1], 2348 OCFS2_BH_CACHED, inode); 2349 if (ret) { 2350 mlog_errno(ret); 2351 goto out; 2352 } 2353 2354 xs->here = &xs->header->xh_entries[index]; 2355 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name, 2356 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index); 2357 } else 2358 ret = -ENODATA; 2359 2360 out: 2361 brelse(bh); 2362 brelse(lower_bh); 2363 return ret; 2364 } 2365 2366 static int ocfs2_xattr_index_block_find(struct inode *inode, 2367 struct buffer_head *root_bh, 2368 int name_index, 2369 const char *name, 2370 struct ocfs2_xattr_search *xs) 2371 { 2372 int ret; 2373 struct ocfs2_xattr_block *xb = 2374 (struct ocfs2_xattr_block *)root_bh->b_data; 2375 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 2376 struct ocfs2_extent_list *el = &xb_root->xt_list; 2377 u64 p_blkno = 0; 2378 u32 first_hash, num_clusters = 0; 2379 u32 name_hash = ocfs2_xattr_hash_by_name(inode, name_index, name); 2380 2381 if (le16_to_cpu(el->l_next_free_rec) == 0) 2382 return -ENODATA; 2383 2384 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n", 2385 name, name_hash, name_index); 2386 2387 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash, 2388 &num_clusters, el); 2389 if (ret) { 2390 mlog_errno(ret); 2391 goto out; 2392 } 2393 2394 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash); 2395 2396 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash " 2397 "in the rec is %u\n", num_clusters, p_blkno, first_hash); 2398 2399 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash, 2400 p_blkno, first_hash, num_clusters, xs); 2401 2402 out: 2403 return ret; 2404 } 2405 2406 static int ocfs2_iterate_xattr_buckets(struct inode *inode, 2407 u64 blkno, 2408 u32 clusters, 2409 xattr_bucket_func *func, 2410 void *para) 2411 { 2412 int i, j, ret = 0; 2413 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2414 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)); 2415 u32 num_buckets = clusters * bpc; 2416 struct ocfs2_xattr_bucket bucket; 2417 2418 memset(&bucket, 0, sizeof(bucket)); 2419 2420 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n", 2421 clusters, blkno); 2422 2423 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) { 2424 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2425 blkno, blk_per_bucket, 2426 bucket.bhs, OCFS2_BH_CACHED, inode); 2427 if (ret) { 2428 mlog_errno(ret); 2429 goto out; 2430 } 2431 2432 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data; 2433 /* 2434 * The real bucket num in this series of blocks is stored 2435 * in the 1st bucket. 2436 */ 2437 if (i == 0) 2438 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets); 2439 2440 mlog(0, "iterating xattr bucket %llu\n", blkno); 2441 if (func) { 2442 ret = func(inode, &bucket, para); 2443 if (ret) { 2444 mlog_errno(ret); 2445 break; 2446 } 2447 } 2448 2449 for (j = 0; j < blk_per_bucket; j++) 2450 brelse(bucket.bhs[j]); 2451 memset(&bucket, 0, sizeof(bucket)); 2452 } 2453 2454 out: 2455 for (j = 0; j < blk_per_bucket; j++) 2456 brelse(bucket.bhs[j]); 2457 2458 return ret; 2459 } 2460 2461 struct ocfs2_xattr_tree_list { 2462 char *buffer; 2463 size_t buffer_size; 2464 }; 2465 2466 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, 2467 struct ocfs2_xattr_header *xh, 2468 int index, 2469 int *block_off, 2470 int *new_offset) 2471 { 2472 u16 name_offset; 2473 2474 if (index < 0 || index >= le16_to_cpu(xh->xh_count)) 2475 return -EINVAL; 2476 2477 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset); 2478 2479 *block_off = name_offset >> inode->i_sb->s_blocksize_bits; 2480 *new_offset = name_offset % inode->i_sb->s_blocksize; 2481 2482 return 0; 2483 } 2484 2485 static int ocfs2_list_xattr_bucket(struct inode *inode, 2486 struct ocfs2_xattr_bucket *bucket, 2487 void *para) 2488 { 2489 int ret = 0; 2490 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para; 2491 size_t size; 2492 int i, block_off, new_offset; 2493 2494 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) { 2495 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i]; 2496 struct xattr_handler *handler = 2497 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); 2498 2499 if (handler) { 2500 ret = ocfs2_xattr_bucket_get_name_value(inode, 2501 bucket->xh, 2502 i, 2503 &block_off, 2504 &new_offset); 2505 if (ret) 2506 break; 2507 size = handler->list(inode, xl->buffer, xl->buffer_size, 2508 bucket->bhs[block_off]->b_data + 2509 new_offset, 2510 entry->xe_name_len); 2511 if (xl->buffer) { 2512 if (size > xl->buffer_size) 2513 return -ERANGE; 2514 xl->buffer += size; 2515 } 2516 xl->buffer_size -= size; 2517 } 2518 } 2519 2520 return ret; 2521 } 2522 2523 static int ocfs2_xattr_tree_list_index_block(struct inode *inode, 2524 struct ocfs2_xattr_tree_root *xt, 2525 char *buffer, 2526 size_t buffer_size) 2527 { 2528 struct ocfs2_extent_list *el = &xt->xt_list; 2529 int ret = 0; 2530 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0; 2531 u64 p_blkno = 0; 2532 struct ocfs2_xattr_tree_list xl = { 2533 .buffer = buffer, 2534 .buffer_size = buffer_size, 2535 }; 2536 2537 if (le16_to_cpu(el->l_next_free_rec) == 0) 2538 return 0; 2539 2540 while (name_hash > 0) { 2541 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 2542 &e_cpos, &num_clusters, el); 2543 if (ret) { 2544 mlog_errno(ret); 2545 goto out; 2546 } 2547 2548 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 2549 ocfs2_list_xattr_bucket, 2550 &xl); 2551 if (ret) { 2552 mlog_errno(ret); 2553 goto out; 2554 } 2555 2556 if (e_cpos == 0) 2557 break; 2558 2559 name_hash = e_cpos - 1; 2560 } 2561 2562 ret = buffer_size - xl.buffer_size; 2563 out: 2564 return ret; 2565 } 2566 2567 static int cmp_xe(const void *a, const void *b) 2568 { 2569 const struct ocfs2_xattr_entry *l = a, *r = b; 2570 u32 l_hash = le32_to_cpu(l->xe_name_hash); 2571 u32 r_hash = le32_to_cpu(r->xe_name_hash); 2572 2573 if (l_hash > r_hash) 2574 return 1; 2575 if (l_hash < r_hash) 2576 return -1; 2577 return 0; 2578 } 2579 2580 static void swap_xe(void *a, void *b, int size) 2581 { 2582 struct ocfs2_xattr_entry *l = a, *r = b, tmp; 2583 2584 tmp = *l; 2585 memcpy(l, r, sizeof(struct ocfs2_xattr_entry)); 2586 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry)); 2587 } 2588 2589 /* 2590 * When the ocfs2_xattr_block is filled up, new bucket will be created 2591 * and all the xattr entries will be moved to the new bucket. 2592 * Note: we need to sort the entries since they are not saved in order 2593 * in the ocfs2_xattr_block. 2594 */ 2595 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode, 2596 struct buffer_head *xb_bh, 2597 struct buffer_head *xh_bh, 2598 struct buffer_head *data_bh) 2599 { 2600 int i, blocksize = inode->i_sb->s_blocksize; 2601 u16 offset, size, off_change; 2602 struct ocfs2_xattr_entry *xe; 2603 struct ocfs2_xattr_block *xb = 2604 (struct ocfs2_xattr_block *)xb_bh->b_data; 2605 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header; 2606 struct ocfs2_xattr_header *xh = 2607 (struct ocfs2_xattr_header *)xh_bh->b_data; 2608 u16 count = le16_to_cpu(xb_xh->xh_count); 2609 char *target = xh_bh->b_data, *src = xb_bh->b_data; 2610 2611 mlog(0, "cp xattr from block %llu to bucket %llu\n", 2612 (unsigned long long)xb_bh->b_blocknr, 2613 (unsigned long long)xh_bh->b_blocknr); 2614 2615 memset(xh_bh->b_data, 0, blocksize); 2616 if (data_bh) 2617 memset(data_bh->b_data, 0, blocksize); 2618 /* 2619 * Since the xe_name_offset is based on ocfs2_xattr_header, 2620 * there is a offset change corresponding to the change of 2621 * ocfs2_xattr_header's position. 2622 */ 2623 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2624 xe = &xb_xh->xh_entries[count - 1]; 2625 offset = le16_to_cpu(xe->xe_name_offset) + off_change; 2626 size = blocksize - offset; 2627 2628 /* copy all the names and values. */ 2629 if (data_bh) 2630 target = data_bh->b_data; 2631 memcpy(target + offset, src + offset, size); 2632 2633 /* Init new header now. */ 2634 xh->xh_count = xb_xh->xh_count; 2635 xh->xh_num_buckets = cpu_to_le16(1); 2636 xh->xh_name_value_len = cpu_to_le16(size); 2637 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size); 2638 2639 /* copy all the entries. */ 2640 target = xh_bh->b_data; 2641 offset = offsetof(struct ocfs2_xattr_header, xh_entries); 2642 size = count * sizeof(struct ocfs2_xattr_entry); 2643 memcpy(target + offset, (char *)xb_xh + offset, size); 2644 2645 /* Change the xe offset for all the xe because of the move. */ 2646 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize + 2647 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2648 for (i = 0; i < count; i++) 2649 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change); 2650 2651 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n", 2652 offset, size, off_change); 2653 2654 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry), 2655 cmp_xe, swap_xe); 2656 } 2657 2658 /* 2659 * After we move xattr from block to index btree, we have to 2660 * update ocfs2_xattr_search to the new xe and base. 2661 * 2662 * When the entry is in xattr block, xattr_bh indicates the storage place. 2663 * While if the entry is in index b-tree, "bucket" indicates the 2664 * real place of the xattr. 2665 */ 2666 static int ocfs2_xattr_update_xattr_search(struct inode *inode, 2667 struct ocfs2_xattr_search *xs, 2668 struct buffer_head *old_bh, 2669 struct buffer_head *new_bh) 2670 { 2671 int ret = 0; 2672 char *buf = old_bh->b_data; 2673 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf; 2674 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header; 2675 int i, blocksize = inode->i_sb->s_blocksize; 2676 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2677 2678 xs->bucket.bhs[0] = new_bh; 2679 get_bh(new_bh); 2680 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data; 2681 xs->header = xs->bucket.xh; 2682 2683 xs->base = new_bh->b_data; 2684 xs->end = xs->base + inode->i_sb->s_blocksize; 2685 2686 if (!xs->not_found) { 2687 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) { 2688 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2689 xs->bucket.bhs[0]->b_blocknr + 1, 2690 blk_per_bucket - 1, &xs->bucket.bhs[1], 2691 OCFS2_BH_CACHED, inode); 2692 if (ret) { 2693 mlog_errno(ret); 2694 return ret; 2695 } 2696 2697 i = xs->here - old_xh->xh_entries; 2698 xs->here = &xs->header->xh_entries[i]; 2699 } 2700 } 2701 2702 return ret; 2703 } 2704 2705 static int ocfs2_xattr_create_index_block(struct inode *inode, 2706 struct ocfs2_xattr_search *xs) 2707 { 2708 int ret, credits = OCFS2_SUBALLOC_ALLOC; 2709 u32 bit_off, len; 2710 u64 blkno; 2711 handle_t *handle; 2712 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2713 struct ocfs2_inode_info *oi = OCFS2_I(inode); 2714 struct ocfs2_alloc_context *data_ac; 2715 struct buffer_head *xh_bh = NULL, *data_bh = NULL; 2716 struct buffer_head *xb_bh = xs->xattr_bh; 2717 struct ocfs2_xattr_block *xb = 2718 (struct ocfs2_xattr_block *)xb_bh->b_data; 2719 struct ocfs2_xattr_tree_root *xr; 2720 u16 xb_flags = le16_to_cpu(xb->xb_flags); 2721 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2722 2723 mlog(0, "create xattr index block for %llu\n", 2724 (unsigned long long)xb_bh->b_blocknr); 2725 2726 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED); 2727 2728 ret = ocfs2_reserve_clusters(osb, 1, &data_ac); 2729 if (ret) { 2730 mlog_errno(ret); 2731 goto out; 2732 } 2733 2734 /* 2735 * XXX: 2736 * We can use this lock for now, and maybe move to a dedicated mutex 2737 * if performance becomes a problem later. 2738 */ 2739 down_write(&oi->ip_alloc_sem); 2740 2741 /* 2742 * 3 more credits, one for xattr block update, one for the 1st block 2743 * of the new xattr bucket and one for the value/data. 2744 */ 2745 credits += 3; 2746 handle = ocfs2_start_trans(osb, credits); 2747 if (IS_ERR(handle)) { 2748 ret = PTR_ERR(handle); 2749 mlog_errno(ret); 2750 goto out_sem; 2751 } 2752 2753 ret = ocfs2_journal_access(handle, inode, xb_bh, 2754 OCFS2_JOURNAL_ACCESS_WRITE); 2755 if (ret) { 2756 mlog_errno(ret); 2757 goto out_commit; 2758 } 2759 2760 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len); 2761 if (ret) { 2762 mlog_errno(ret); 2763 goto out_commit; 2764 } 2765 2766 /* 2767 * The bucket may spread in many blocks, and 2768 * we will only touch the 1st block and the last block 2769 * in the whole bucket(one for entry and one for data). 2770 */ 2771 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off); 2772 2773 mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno); 2774 2775 xh_bh = sb_getblk(inode->i_sb, blkno); 2776 if (!xh_bh) { 2777 ret = -EIO; 2778 mlog_errno(ret); 2779 goto out_commit; 2780 } 2781 2782 ocfs2_set_new_buffer_uptodate(inode, xh_bh); 2783 2784 ret = ocfs2_journal_access(handle, inode, xh_bh, 2785 OCFS2_JOURNAL_ACCESS_CREATE); 2786 if (ret) { 2787 mlog_errno(ret); 2788 goto out_commit; 2789 } 2790 2791 if (bpb > 1) { 2792 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1); 2793 if (!data_bh) { 2794 ret = -EIO; 2795 mlog_errno(ret); 2796 goto out_commit; 2797 } 2798 2799 ocfs2_set_new_buffer_uptodate(inode, data_bh); 2800 2801 ret = ocfs2_journal_access(handle, inode, data_bh, 2802 OCFS2_JOURNAL_ACCESS_CREATE); 2803 if (ret) { 2804 mlog_errno(ret); 2805 goto out_commit; 2806 } 2807 } 2808 2809 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh); 2810 2811 ocfs2_journal_dirty(handle, xh_bh); 2812 if (data_bh) 2813 ocfs2_journal_dirty(handle, data_bh); 2814 2815 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh); 2816 2817 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */ 2818 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 2819 offsetof(struct ocfs2_xattr_block, xb_attrs)); 2820 2821 xr = &xb->xb_attrs.xb_root; 2822 xr->xt_clusters = cpu_to_le32(1); 2823 xr->xt_last_eb_blk = 0; 2824 xr->xt_list.l_tree_depth = 0; 2825 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb)); 2826 xr->xt_list.l_next_free_rec = cpu_to_le16(1); 2827 2828 xr->xt_list.l_recs[0].e_cpos = 0; 2829 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno); 2830 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1); 2831 2832 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED); 2833 2834 ret = ocfs2_journal_dirty(handle, xb_bh); 2835 if (ret) { 2836 mlog_errno(ret); 2837 goto out_commit; 2838 } 2839 2840 out_commit: 2841 ocfs2_commit_trans(osb, handle); 2842 2843 out_sem: 2844 up_write(&oi->ip_alloc_sem); 2845 2846 out: 2847 if (data_ac) 2848 ocfs2_free_alloc_context(data_ac); 2849 2850 brelse(xh_bh); 2851 brelse(data_bh); 2852 2853 return ret; 2854 } 2855 2856 static int cmp_xe_offset(const void *a, const void *b) 2857 { 2858 const struct ocfs2_xattr_entry *l = a, *r = b; 2859 u32 l_name_offset = le16_to_cpu(l->xe_name_offset); 2860 u32 r_name_offset = le16_to_cpu(r->xe_name_offset); 2861 2862 if (l_name_offset < r_name_offset) 2863 return 1; 2864 if (l_name_offset > r_name_offset) 2865 return -1; 2866 return 0; 2867 } 2868 2869 /* 2870 * defrag a xattr bucket if we find that the bucket has some 2871 * holes beteen name/value pairs. 2872 * We will move all the name/value pairs to the end of the bucket 2873 * so that we can spare some space for insertion. 2874 */ 2875 static int ocfs2_defrag_xattr_bucket(struct inode *inode, 2876 struct ocfs2_xattr_bucket *bucket) 2877 { 2878 int ret, i; 2879 size_t end, offset, len, value_len; 2880 struct ocfs2_xattr_header *xh; 2881 char *entries, *buf, *bucket_buf = NULL; 2882 u64 blkno = bucket->bhs[0]->b_blocknr; 2883 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2884 u16 xh_free_start; 2885 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2886 size_t blocksize = inode->i_sb->s_blocksize; 2887 handle_t *handle; 2888 struct buffer_head **bhs; 2889 struct ocfs2_xattr_entry *xe; 2890 2891 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 2892 GFP_NOFS); 2893 if (!bhs) 2894 return -ENOMEM; 2895 2896 ret = ocfs2_read_blocks(osb, blkno, blk_per_bucket, bhs, 2897 OCFS2_BH_CACHED, inode); 2898 if (ret) 2899 goto out; 2900 2901 /* 2902 * In order to make the operation more efficient and generic, 2903 * we copy all the blocks into a contiguous memory and do the 2904 * defragment there, so if anything is error, we will not touch 2905 * the real block. 2906 */ 2907 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS); 2908 if (!bucket_buf) { 2909 ret = -EIO; 2910 goto out; 2911 } 2912 2913 buf = bucket_buf; 2914 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) 2915 memcpy(buf, bhs[i]->b_data, blocksize); 2916 2917 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket); 2918 if (IS_ERR(handle)) { 2919 ret = PTR_ERR(handle); 2920 handle = NULL; 2921 mlog_errno(ret); 2922 goto out; 2923 } 2924 2925 for (i = 0; i < blk_per_bucket; i++) { 2926 ret = ocfs2_journal_access(handle, inode, bhs[i], 2927 OCFS2_JOURNAL_ACCESS_WRITE); 2928 if (ret < 0) { 2929 mlog_errno(ret); 2930 goto commit; 2931 } 2932 } 2933 2934 xh = (struct ocfs2_xattr_header *)bucket_buf; 2935 entries = (char *)xh->xh_entries; 2936 xh_free_start = le16_to_cpu(xh->xh_free_start); 2937 2938 mlog(0, "adjust xattr bucket in %llu, count = %u, " 2939 "xh_free_start = %u, xh_name_value_len = %u.\n", 2940 blkno, le16_to_cpu(xh->xh_count), xh_free_start, 2941 le16_to_cpu(xh->xh_name_value_len)); 2942 2943 /* 2944 * sort all the entries by their offset. 2945 * the largest will be the first, so that we can 2946 * move them to the end one by one. 2947 */ 2948 sort(entries, le16_to_cpu(xh->xh_count), 2949 sizeof(struct ocfs2_xattr_entry), 2950 cmp_xe_offset, swap_xe); 2951 2952 /* Move all name/values to the end of the bucket. */ 2953 xe = xh->xh_entries; 2954 end = OCFS2_XATTR_BUCKET_SIZE; 2955 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) { 2956 offset = le16_to_cpu(xe->xe_name_offset); 2957 if (ocfs2_xattr_is_local(xe)) 2958 value_len = OCFS2_XATTR_SIZE( 2959 le64_to_cpu(xe->xe_value_size)); 2960 else 2961 value_len = OCFS2_XATTR_ROOT_SIZE; 2962 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len; 2963 2964 /* 2965 * We must make sure that the name/value pair 2966 * exist in the same block. So adjust end to 2967 * the previous block end if needed. 2968 */ 2969 if (((end - len) / blocksize != 2970 (end - 1) / blocksize)) 2971 end = end - end % blocksize; 2972 2973 if (end > offset + len) { 2974 memmove(bucket_buf + end - len, 2975 bucket_buf + offset, len); 2976 xe->xe_name_offset = cpu_to_le16(end - len); 2977 } 2978 2979 mlog_bug_on_msg(end < offset + len, "Defrag check failed for " 2980 "bucket %llu\n", (unsigned long long)blkno); 2981 2982 end -= len; 2983 } 2984 2985 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for " 2986 "bucket %llu\n", (unsigned long long)blkno); 2987 2988 if (xh_free_start == end) 2989 goto commit; 2990 2991 memset(bucket_buf + xh_free_start, 0, end - xh_free_start); 2992 xh->xh_free_start = cpu_to_le16(end); 2993 2994 /* sort the entries by their name_hash. */ 2995 sort(entries, le16_to_cpu(xh->xh_count), 2996 sizeof(struct ocfs2_xattr_entry), 2997 cmp_xe, swap_xe); 2998 2999 buf = bucket_buf; 3000 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) { 3001 memcpy(bhs[i]->b_data, buf, blocksize); 3002 ocfs2_journal_dirty(handle, bhs[i]); 3003 } 3004 3005 commit: 3006 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 3007 out: 3008 3009 if (bhs) { 3010 for (i = 0; i < blk_per_bucket; i++) 3011 brelse(bhs[i]); 3012 } 3013 kfree(bhs); 3014 3015 kfree(bucket_buf); 3016 return ret; 3017 } 3018 3019 /* 3020 * Move half nums of the xattr bucket in the previous cluster to this new 3021 * cluster. We only touch the last cluster of the previous extend record. 3022 * 3023 * first_bh is the first buffer_head of a series of bucket in the same 3024 * extent rec and header_bh is the header of one bucket in this cluster. 3025 * They will be updated if we move the data header_bh contains to the new 3026 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster. 3027 */ 3028 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode, 3029 handle_t *handle, 3030 struct buffer_head **first_bh, 3031 struct buffer_head **header_bh, 3032 u64 new_blkno, 3033 u64 prev_blkno, 3034 u32 num_clusters, 3035 u32 *first_hash) 3036 { 3037 int i, ret, credits; 3038 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3039 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3040 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3041 int blocksize = inode->i_sb->s_blocksize; 3042 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL; 3043 struct ocfs2_xattr_header *new_xh; 3044 struct ocfs2_xattr_header *xh = 3045 (struct ocfs2_xattr_header *)((*first_bh)->b_data); 3046 3047 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets); 3048 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize); 3049 3050 prev_bh = *first_bh; 3051 get_bh(prev_bh); 3052 xh = (struct ocfs2_xattr_header *)prev_bh->b_data; 3053 3054 prev_blkno += (num_clusters - 1) * bpc + bpc / 2; 3055 3056 mlog(0, "move half of xattrs in cluster %llu to %llu\n", 3057 prev_blkno, new_blkno); 3058 3059 /* 3060 * We need to update the 1st half of the new cluster and 3061 * 1 more for the update of the 1st bucket of the previous 3062 * extent record. 3063 */ 3064 credits = bpc / 2 + 1; 3065 ret = ocfs2_extend_trans(handle, credits); 3066 if (ret) { 3067 mlog_errno(ret); 3068 goto out; 3069 } 3070 3071 ret = ocfs2_journal_access(handle, inode, prev_bh, 3072 OCFS2_JOURNAL_ACCESS_WRITE); 3073 if (ret) { 3074 mlog_errno(ret); 3075 goto out; 3076 } 3077 3078 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) { 3079 old_bh = new_bh = NULL; 3080 new_bh = sb_getblk(inode->i_sb, new_blkno); 3081 if (!new_bh) { 3082 ret = -EIO; 3083 mlog_errno(ret); 3084 goto out; 3085 } 3086 3087 ocfs2_set_new_buffer_uptodate(inode, new_bh); 3088 3089 ret = ocfs2_journal_access(handle, inode, new_bh, 3090 OCFS2_JOURNAL_ACCESS_CREATE); 3091 if (ret < 0) { 3092 mlog_errno(ret); 3093 brelse(new_bh); 3094 goto out; 3095 } 3096 3097 ret = ocfs2_read_block(osb, prev_blkno, 3098 &old_bh, OCFS2_BH_CACHED, inode); 3099 if (ret < 0) { 3100 mlog_errno(ret); 3101 brelse(new_bh); 3102 goto out; 3103 } 3104 3105 memcpy(new_bh->b_data, old_bh->b_data, blocksize); 3106 3107 if (i == 0) { 3108 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data; 3109 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2); 3110 3111 if (first_hash) 3112 *first_hash = le32_to_cpu( 3113 new_xh->xh_entries[0].xe_name_hash); 3114 new_first_bh = new_bh; 3115 get_bh(new_first_bh); 3116 } 3117 3118 ocfs2_journal_dirty(handle, new_bh); 3119 3120 if (*header_bh == old_bh) { 3121 brelse(*header_bh); 3122 *header_bh = new_bh; 3123 get_bh(*header_bh); 3124 3125 brelse(*first_bh); 3126 *first_bh = new_first_bh; 3127 get_bh(*first_bh); 3128 } 3129 brelse(new_bh); 3130 brelse(old_bh); 3131 } 3132 3133 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2)); 3134 3135 ocfs2_journal_dirty(handle, prev_bh); 3136 out: 3137 brelse(prev_bh); 3138 brelse(new_first_bh); 3139 return ret; 3140 } 3141 3142 static int ocfs2_read_xattr_bucket(struct inode *inode, 3143 u64 blkno, 3144 struct buffer_head **bhs, 3145 int new) 3146 { 3147 int ret = 0; 3148 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3149 3150 if (!new) 3151 return ocfs2_read_blocks(OCFS2_SB(inode->i_sb), blkno, 3152 blk_per_bucket, bhs, 3153 OCFS2_BH_CACHED, inode); 3154 3155 for (i = 0; i < blk_per_bucket; i++) { 3156 bhs[i] = sb_getblk(inode->i_sb, blkno + i); 3157 if (bhs[i] == NULL) { 3158 ret = -EIO; 3159 mlog_errno(ret); 3160 break; 3161 } 3162 ocfs2_set_new_buffer_uptodate(inode, bhs[i]); 3163 } 3164 3165 return ret; 3166 } 3167 3168 /* 3169 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk). 3170 * first_hash will record the 1st hash of the new bucket. 3171 */ 3172 static int ocfs2_half_xattr_bucket(struct inode *inode, 3173 handle_t *handle, 3174 u64 blk, 3175 u64 new_blk, 3176 u32 *first_hash, 3177 int new_bucket_head) 3178 { 3179 int ret, i; 3180 u16 count, start, len, name_value_len, xe_len, name_offset; 3181 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3182 struct buffer_head **s_bhs, **t_bhs = NULL; 3183 struct ocfs2_xattr_header *xh; 3184 struct ocfs2_xattr_entry *xe; 3185 int blocksize = inode->i_sb->s_blocksize; 3186 3187 mlog(0, "move half of xattrs from bucket %llu to %llu\n", 3188 blk, new_blk); 3189 3190 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3191 if (!s_bhs) 3192 return -ENOMEM; 3193 3194 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0); 3195 if (ret) { 3196 mlog_errno(ret); 3197 goto out; 3198 } 3199 3200 ret = ocfs2_journal_access(handle, inode, s_bhs[0], 3201 OCFS2_JOURNAL_ACCESS_WRITE); 3202 if (ret) { 3203 mlog_errno(ret); 3204 goto out; 3205 } 3206 3207 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3208 if (!t_bhs) { 3209 ret = -ENOMEM; 3210 goto out; 3211 } 3212 3213 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head); 3214 if (ret) { 3215 mlog_errno(ret); 3216 goto out; 3217 } 3218 3219 for (i = 0; i < blk_per_bucket; i++) { 3220 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3221 OCFS2_JOURNAL_ACCESS_CREATE); 3222 if (ret) { 3223 mlog_errno(ret); 3224 goto out; 3225 } 3226 } 3227 3228 /* copy the whole bucket to the new first. */ 3229 for (i = 0; i < blk_per_bucket; i++) 3230 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3231 3232 /* update the new bucket. */ 3233 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data; 3234 count = le16_to_cpu(xh->xh_count); 3235 start = count / 2; 3236 3237 /* 3238 * Calculate the total name/value len and xh_free_start for 3239 * the old bucket first. 3240 */ 3241 name_offset = OCFS2_XATTR_BUCKET_SIZE; 3242 name_value_len = 0; 3243 for (i = 0; i < start; i++) { 3244 xe = &xh->xh_entries[i]; 3245 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3246 if (ocfs2_xattr_is_local(xe)) 3247 xe_len += 3248 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3249 else 3250 xe_len += OCFS2_XATTR_ROOT_SIZE; 3251 name_value_len += xe_len; 3252 if (le16_to_cpu(xe->xe_name_offset) < name_offset) 3253 name_offset = le16_to_cpu(xe->xe_name_offset); 3254 } 3255 3256 /* 3257 * Now begin the modification to the new bucket. 3258 * 3259 * In the new bucket, We just move the xattr entry to the beginning 3260 * and don't touch the name/value. So there will be some holes in the 3261 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is 3262 * called. 3263 */ 3264 xe = &xh->xh_entries[start]; 3265 len = sizeof(struct ocfs2_xattr_entry) * (count - start); 3266 mlog(0, "mv xattr entry len %d from %d to %d\n", len, 3267 (char *)xe - (char *)xh, (char *)xh->xh_entries - (char *)xh); 3268 memmove((char *)xh->xh_entries, (char *)xe, len); 3269 xe = &xh->xh_entries[count - start]; 3270 len = sizeof(struct ocfs2_xattr_entry) * start; 3271 memset((char *)xe, 0, len); 3272 3273 le16_add_cpu(&xh->xh_count, -start); 3274 le16_add_cpu(&xh->xh_name_value_len, -name_value_len); 3275 3276 /* Calculate xh_free_start for the new bucket. */ 3277 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); 3278 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 3279 xe = &xh->xh_entries[i]; 3280 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3281 if (ocfs2_xattr_is_local(xe)) 3282 xe_len += 3283 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3284 else 3285 xe_len += OCFS2_XATTR_ROOT_SIZE; 3286 if (le16_to_cpu(xe->xe_name_offset) < 3287 le16_to_cpu(xh->xh_free_start)) 3288 xh->xh_free_start = xe->xe_name_offset; 3289 } 3290 3291 /* set xh->xh_num_buckets for the new xh. */ 3292 if (new_bucket_head) 3293 xh->xh_num_buckets = cpu_to_le16(1); 3294 else 3295 xh->xh_num_buckets = 0; 3296 3297 for (i = 0; i < blk_per_bucket; i++) { 3298 ocfs2_journal_dirty(handle, t_bhs[i]); 3299 if (ret) 3300 mlog_errno(ret); 3301 } 3302 3303 /* store the first_hash of the new bucket. */ 3304 if (first_hash) 3305 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3306 3307 /* 3308 * Now only update the 1st block of the old bucket. 3309 * Please note that the entry has been sorted already above. 3310 */ 3311 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data; 3312 memset(&xh->xh_entries[start], 0, 3313 sizeof(struct ocfs2_xattr_entry) * (count - start)); 3314 xh->xh_count = cpu_to_le16(start); 3315 xh->xh_free_start = cpu_to_le16(name_offset); 3316 xh->xh_name_value_len = cpu_to_le16(name_value_len); 3317 3318 ocfs2_journal_dirty(handle, s_bhs[0]); 3319 if (ret) 3320 mlog_errno(ret); 3321 3322 out: 3323 if (s_bhs) { 3324 for (i = 0; i < blk_per_bucket; i++) 3325 brelse(s_bhs[i]); 3326 } 3327 kfree(s_bhs); 3328 3329 if (t_bhs) { 3330 for (i = 0; i < blk_per_bucket; i++) 3331 brelse(t_bhs[i]); 3332 } 3333 kfree(t_bhs); 3334 3335 return ret; 3336 } 3337 3338 /* 3339 * Copy xattr from one bucket to another bucket. 3340 * 3341 * The caller must make sure that the journal transaction 3342 * has enough space for journaling. 3343 */ 3344 static int ocfs2_cp_xattr_bucket(struct inode *inode, 3345 handle_t *handle, 3346 u64 s_blkno, 3347 u64 t_blkno, 3348 int t_is_new) 3349 { 3350 int ret, i; 3351 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3352 int blocksize = inode->i_sb->s_blocksize; 3353 struct buffer_head **s_bhs, **t_bhs = NULL; 3354 3355 BUG_ON(s_blkno == t_blkno); 3356 3357 mlog(0, "cp bucket %llu to %llu, target is %d\n", 3358 s_blkno, t_blkno, t_is_new); 3359 3360 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3361 GFP_NOFS); 3362 if (!s_bhs) 3363 return -ENOMEM; 3364 3365 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0); 3366 if (ret) 3367 goto out; 3368 3369 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3370 GFP_NOFS); 3371 if (!t_bhs) { 3372 ret = -ENOMEM; 3373 goto out; 3374 } 3375 3376 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new); 3377 if (ret) 3378 goto out; 3379 3380 for (i = 0; i < blk_per_bucket; i++) { 3381 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3382 OCFS2_JOURNAL_ACCESS_WRITE); 3383 if (ret) 3384 goto out; 3385 } 3386 3387 for (i = 0; i < blk_per_bucket; i++) { 3388 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3389 ocfs2_journal_dirty(handle, t_bhs[i]); 3390 } 3391 3392 out: 3393 if (s_bhs) { 3394 for (i = 0; i < blk_per_bucket; i++) 3395 brelse(s_bhs[i]); 3396 } 3397 kfree(s_bhs); 3398 3399 if (t_bhs) { 3400 for (i = 0; i < blk_per_bucket; i++) 3401 brelse(t_bhs[i]); 3402 } 3403 kfree(t_bhs); 3404 3405 return ret; 3406 } 3407 3408 /* 3409 * Copy one xattr cluster from src_blk to to_blk. 3410 * The to_blk will become the first bucket header of the cluster, so its 3411 * xh_num_buckets will be initialized as the bucket num in the cluster. 3412 */ 3413 static int ocfs2_cp_xattr_cluster(struct inode *inode, 3414 handle_t *handle, 3415 struct buffer_head *first_bh, 3416 u64 src_blk, 3417 u64 to_blk, 3418 u32 *first_hash) 3419 { 3420 int i, ret, credits; 3421 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3422 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3423 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3424 struct buffer_head *bh = NULL; 3425 struct ocfs2_xattr_header *xh; 3426 u64 to_blk_start = to_blk; 3427 3428 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk); 3429 3430 /* 3431 * We need to update the new cluster and 1 more for the update of 3432 * the 1st bucket of the previous extent rec. 3433 */ 3434 credits = bpc + 1; 3435 ret = ocfs2_extend_trans(handle, credits); 3436 if (ret) { 3437 mlog_errno(ret); 3438 goto out; 3439 } 3440 3441 ret = ocfs2_journal_access(handle, inode, first_bh, 3442 OCFS2_JOURNAL_ACCESS_WRITE); 3443 if (ret) { 3444 mlog_errno(ret); 3445 goto out; 3446 } 3447 3448 for (i = 0; i < num_buckets; i++) { 3449 ret = ocfs2_cp_xattr_bucket(inode, handle, 3450 src_blk, to_blk, 1); 3451 if (ret) { 3452 mlog_errno(ret); 3453 goto out; 3454 } 3455 3456 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3457 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3458 } 3459 3460 /* update the old bucket header. */ 3461 xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3462 le16_add_cpu(&xh->xh_num_buckets, -num_buckets); 3463 3464 ocfs2_journal_dirty(handle, first_bh); 3465 3466 /* update the new bucket header. */ 3467 ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode); 3468 if (ret < 0) { 3469 mlog_errno(ret); 3470 goto out; 3471 } 3472 3473 ret = ocfs2_journal_access(handle, inode, bh, 3474 OCFS2_JOURNAL_ACCESS_WRITE); 3475 if (ret) { 3476 mlog_errno(ret); 3477 goto out; 3478 } 3479 3480 xh = (struct ocfs2_xattr_header *)bh->b_data; 3481 xh->xh_num_buckets = cpu_to_le16(num_buckets); 3482 3483 ocfs2_journal_dirty(handle, bh); 3484 3485 if (first_hash) 3486 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3487 out: 3488 brelse(bh); 3489 return ret; 3490 } 3491 3492 /* 3493 * Move half of the xattrs in this cluster to the new cluster. 3494 * This function should only be called when bucket size == cluster size. 3495 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead. 3496 */ 3497 static int ocfs2_half_xattr_cluster(struct inode *inode, 3498 handle_t *handle, 3499 u64 prev_blk, 3500 u64 new_blk, 3501 u32 *first_hash) 3502 { 3503 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3504 int ret, credits = 2 * blk_per_bucket; 3505 3506 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize); 3507 3508 ret = ocfs2_extend_trans(handle, credits); 3509 if (ret) { 3510 mlog_errno(ret); 3511 return ret; 3512 } 3513 3514 /* Move half of the xattr in start_blk to the next bucket. */ 3515 return ocfs2_half_xattr_bucket(inode, handle, prev_blk, 3516 new_blk, first_hash, 1); 3517 } 3518 3519 /* 3520 * Move some xattrs from the old cluster to the new one since they are not 3521 * contiguous in ocfs2 xattr tree. 3522 * 3523 * new_blk starts a new separate cluster, and we will move some xattrs from 3524 * prev_blk to it. v_start will be set as the first name hash value in this 3525 * new cluster so that it can be used as e_cpos during tree insertion and 3526 * don't collide with our original b-tree operations. first_bh and header_bh 3527 * will also be updated since they will be used in ocfs2_extend_xattr_bucket 3528 * to extend the insert bucket. 3529 * 3530 * The problem is how much xattr should we move to the new one and when should 3531 * we update first_bh and header_bh? 3532 * 1. If cluster size > bucket size, that means the previous cluster has more 3533 * than 1 bucket, so just move half nums of bucket into the new cluster and 3534 * update the first_bh and header_bh if the insert bucket has been moved 3535 * to the new cluster. 3536 * 2. If cluster_size == bucket_size: 3537 * a) If the previous extent rec has more than one cluster and the insert 3538 * place isn't in the last cluster, copy the entire last cluster to the 3539 * new one. This time, we don't need to upate the first_bh and header_bh 3540 * since they will not be moved into the new cluster. 3541 * b) Otherwise, move the bottom half of the xattrs in the last cluster into 3542 * the new one. And we set the extend flag to zero if the insert place is 3543 * moved into the new allocated cluster since no extend is needed. 3544 */ 3545 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode, 3546 handle_t *handle, 3547 struct buffer_head **first_bh, 3548 struct buffer_head **header_bh, 3549 u64 new_blk, 3550 u64 prev_blk, 3551 u32 prev_clusters, 3552 u32 *v_start, 3553 int *extend) 3554 { 3555 int ret = 0; 3556 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3557 3558 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n", 3559 prev_blk, prev_clusters, new_blk); 3560 3561 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) 3562 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode, 3563 handle, 3564 first_bh, 3565 header_bh, 3566 new_blk, 3567 prev_blk, 3568 prev_clusters, 3569 v_start); 3570 else { 3571 u64 last_blk = prev_blk + bpc * (prev_clusters - 1); 3572 3573 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk) 3574 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh, 3575 last_blk, new_blk, 3576 v_start); 3577 else { 3578 ret = ocfs2_half_xattr_cluster(inode, handle, 3579 last_blk, new_blk, 3580 v_start); 3581 3582 if ((*header_bh)->b_blocknr == last_blk && extend) 3583 *extend = 0; 3584 } 3585 } 3586 3587 return ret; 3588 } 3589 3590 /* 3591 * Add a new cluster for xattr storage. 3592 * 3593 * If the new cluster is contiguous with the previous one, it will be 3594 * appended to the same extent record, and num_clusters will be updated. 3595 * If not, we will insert a new extent for it and move some xattrs in 3596 * the last cluster into the new allocated one. 3597 * We also need to limit the maximum size of a btree leaf, otherwise we'll 3598 * lose the benefits of hashing because we'll have to search large leaves. 3599 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize, 3600 * if it's bigger). 3601 * 3602 * first_bh is the first block of the previous extent rec and header_bh 3603 * indicates the bucket we will insert the new xattrs. They will be updated 3604 * when the header_bh is moved into the new cluster. 3605 */ 3606 static int ocfs2_add_new_xattr_cluster(struct inode *inode, 3607 struct buffer_head *root_bh, 3608 struct buffer_head **first_bh, 3609 struct buffer_head **header_bh, 3610 u32 *num_clusters, 3611 u32 prev_cpos, 3612 u64 prev_blkno, 3613 int *extend) 3614 { 3615 int ret, credits; 3616 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3617 u32 prev_clusters = *num_clusters; 3618 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0; 3619 u64 block; 3620 handle_t *handle = NULL; 3621 struct ocfs2_alloc_context *data_ac = NULL; 3622 struct ocfs2_alloc_context *meta_ac = NULL; 3623 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3624 struct ocfs2_xattr_block *xb = 3625 (struct ocfs2_xattr_block *)root_bh->b_data; 3626 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 3627 struct ocfs2_extent_list *root_el = &xb_root->xt_list; 3628 enum ocfs2_extent_tree_type type = OCFS2_XATTR_TREE_EXTENT; 3629 3630 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, " 3631 "previous xattr blkno = %llu\n", 3632 (unsigned long long)OCFS2_I(inode)->ip_blkno, 3633 prev_cpos, prev_blkno); 3634 3635 ret = ocfs2_lock_allocators(inode, root_bh, root_el, 3636 clusters_to_add, 0, &data_ac, 3637 &meta_ac, type, NULL); 3638 if (ret) { 3639 mlog_errno(ret); 3640 goto leave; 3641 } 3642 3643 credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add); 3644 handle = ocfs2_start_trans(osb, credits); 3645 if (IS_ERR(handle)) { 3646 ret = PTR_ERR(handle); 3647 handle = NULL; 3648 mlog_errno(ret); 3649 goto leave; 3650 } 3651 3652 ret = ocfs2_journal_access(handle, inode, root_bh, 3653 OCFS2_JOURNAL_ACCESS_WRITE); 3654 if (ret < 0) { 3655 mlog_errno(ret); 3656 goto leave; 3657 } 3658 3659 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1, 3660 clusters_to_add, &bit_off, &num_bits); 3661 if (ret < 0) { 3662 if (ret != -ENOSPC) 3663 mlog_errno(ret); 3664 goto leave; 3665 } 3666 3667 BUG_ON(num_bits > clusters_to_add); 3668 3669 block = ocfs2_clusters_to_blocks(osb->sb, bit_off); 3670 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n", 3671 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); 3672 3673 if (prev_blkno + prev_clusters * bpc == block && 3674 (prev_clusters + num_bits) << osb->s_clustersize_bits <= 3675 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) { 3676 /* 3677 * If this cluster is contiguous with the old one and 3678 * adding this new cluster, we don't surpass the limit of 3679 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be 3680 * initialized and used like other buckets in the previous 3681 * cluster. 3682 * So add it as a contiguous one. The caller will handle 3683 * its init process. 3684 */ 3685 v_start = prev_cpos + prev_clusters; 3686 *num_clusters = prev_clusters + num_bits; 3687 mlog(0, "Add contiguous %u clusters to previous extent rec.\n", 3688 num_bits); 3689 } else { 3690 ret = ocfs2_adjust_xattr_cross_cluster(inode, 3691 handle, 3692 first_bh, 3693 header_bh, 3694 block, 3695 prev_blkno, 3696 prev_clusters, 3697 &v_start, 3698 extend); 3699 if (ret) { 3700 mlog_errno(ret); 3701 goto leave; 3702 } 3703 } 3704 3705 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n", 3706 num_bits, block, v_start); 3707 ret = ocfs2_xattr_tree_insert_extent(osb, handle, inode, root_bh, 3708 v_start, block, num_bits, 3709 0, meta_ac); 3710 if (ret < 0) { 3711 mlog_errno(ret); 3712 goto leave; 3713 } 3714 3715 ret = ocfs2_journal_dirty(handle, root_bh); 3716 if (ret < 0) { 3717 mlog_errno(ret); 3718 goto leave; 3719 } 3720 3721 leave: 3722 if (handle) 3723 ocfs2_commit_trans(osb, handle); 3724 if (data_ac) 3725 ocfs2_free_alloc_context(data_ac); 3726 if (meta_ac) 3727 ocfs2_free_alloc_context(meta_ac); 3728 3729 return ret; 3730 } 3731 3732 /* 3733 * Extend a new xattr bucket and move xattrs to the end one by one until 3734 * We meet with start_bh. Only move half of the xattrs to the bucket after it. 3735 */ 3736 static int ocfs2_extend_xattr_bucket(struct inode *inode, 3737 struct buffer_head *first_bh, 3738 struct buffer_head *start_bh, 3739 u32 num_clusters) 3740 { 3741 int ret, credits; 3742 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3743 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3744 u64 start_blk = start_bh->b_blocknr, end_blk; 3745 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb); 3746 handle_t *handle; 3747 struct ocfs2_xattr_header *first_xh = 3748 (struct ocfs2_xattr_header *)first_bh->b_data; 3749 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets); 3750 3751 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting " 3752 "from %llu, len = %u\n", start_blk, 3753 (unsigned long long)first_bh->b_blocknr, num_clusters); 3754 3755 BUG_ON(bucket >= num_buckets); 3756 3757 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket; 3758 3759 /* 3760 * We will touch all the buckets after the start_bh(include it). 3761 * Add one more bucket and modify the first_bh. 3762 */ 3763 credits = end_blk - start_blk + 2 * blk_per_bucket + 1; 3764 handle = ocfs2_start_trans(osb, credits); 3765 if (IS_ERR(handle)) { 3766 ret = PTR_ERR(handle); 3767 handle = NULL; 3768 mlog_errno(ret); 3769 goto out; 3770 } 3771 3772 ret = ocfs2_journal_access(handle, inode, first_bh, 3773 OCFS2_JOURNAL_ACCESS_WRITE); 3774 if (ret) { 3775 mlog_errno(ret); 3776 goto commit; 3777 } 3778 3779 while (end_blk != start_blk) { 3780 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk, 3781 end_blk + blk_per_bucket, 0); 3782 if (ret) 3783 goto commit; 3784 end_blk -= blk_per_bucket; 3785 } 3786 3787 /* Move half of the xattr in start_blk to the next bucket. */ 3788 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk, 3789 start_blk + blk_per_bucket, NULL, 0); 3790 3791 le16_add_cpu(&first_xh->xh_num_buckets, 1); 3792 ocfs2_journal_dirty(handle, first_bh); 3793 3794 commit: 3795 ocfs2_commit_trans(osb, handle); 3796 out: 3797 return ret; 3798 } 3799 3800 /* 3801 * Add new xattr bucket in an extent record and adjust the buckets accordingly. 3802 * xb_bh is the ocfs2_xattr_block. 3803 * We will move all the buckets starting from header_bh to the next place. As 3804 * for this one, half num of its xattrs will be moved to the next one. 3805 * 3806 * We will allocate a new cluster if current cluster is full and adjust 3807 * header_bh and first_bh if the insert place is moved to the new cluster. 3808 */ 3809 static int ocfs2_add_new_xattr_bucket(struct inode *inode, 3810 struct buffer_head *xb_bh, 3811 struct buffer_head *header_bh) 3812 { 3813 struct ocfs2_xattr_header *first_xh = NULL; 3814 struct buffer_head *first_bh = NULL; 3815 struct ocfs2_xattr_block *xb = 3816 (struct ocfs2_xattr_block *)xb_bh->b_data; 3817 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 3818 struct ocfs2_extent_list *el = &xb_root->xt_list; 3819 struct ocfs2_xattr_header *xh = 3820 (struct ocfs2_xattr_header *)header_bh->b_data; 3821 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3822 struct super_block *sb = inode->i_sb; 3823 struct ocfs2_super *osb = OCFS2_SB(sb); 3824 int ret, num_buckets, extend = 1; 3825 u64 p_blkno; 3826 u32 e_cpos, num_clusters; 3827 3828 mlog(0, "Add new xattr bucket starting form %llu\n", 3829 (unsigned long long)header_bh->b_blocknr); 3830 3831 /* 3832 * Add refrence for header_bh here because it may be 3833 * changed in ocfs2_add_new_xattr_cluster and we need 3834 * to free it in the end. 3835 */ 3836 get_bh(header_bh); 3837 3838 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos, 3839 &num_clusters, el); 3840 if (ret) { 3841 mlog_errno(ret); 3842 goto out; 3843 } 3844 3845 ret = ocfs2_read_block(osb, p_blkno, 3846 &first_bh, OCFS2_BH_CACHED, inode); 3847 if (ret) { 3848 mlog_errno(ret); 3849 goto out; 3850 } 3851 3852 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters; 3853 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3854 3855 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) { 3856 ret = ocfs2_add_new_xattr_cluster(inode, 3857 xb_bh, 3858 &first_bh, 3859 &header_bh, 3860 &num_clusters, 3861 e_cpos, 3862 p_blkno, 3863 &extend); 3864 if (ret) { 3865 mlog_errno(ret); 3866 goto out; 3867 } 3868 } 3869 3870 if (extend) 3871 ret = ocfs2_extend_xattr_bucket(inode, 3872 first_bh, 3873 header_bh, 3874 num_clusters); 3875 if (ret) 3876 mlog_errno(ret); 3877 out: 3878 brelse(first_bh); 3879 brelse(header_bh); 3880 return ret; 3881 } 3882 3883 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode, 3884 struct ocfs2_xattr_bucket *bucket, 3885 int offs) 3886 { 3887 int block_off = offs >> inode->i_sb->s_blocksize_bits; 3888 3889 offs = offs % inode->i_sb->s_blocksize; 3890 return bucket->bhs[block_off]->b_data + offs; 3891 } 3892 3893 /* 3894 * Handle the normal xattr set, including replace, delete and new. 3895 * When the bucket is empty, "is_empty" is set and the caller can 3896 * free this bucket. 3897 * 3898 * Note: "local" indicates the real data's locality. So we can't 3899 * just its bucket locality by its length. 3900 */ 3901 static void ocfs2_xattr_set_entry_normal(struct inode *inode, 3902 struct ocfs2_xattr_info *xi, 3903 struct ocfs2_xattr_search *xs, 3904 u32 name_hash, 3905 int local, 3906 int *is_empty) 3907 { 3908 struct ocfs2_xattr_entry *last, *xe; 3909 int name_len = strlen(xi->name); 3910 struct ocfs2_xattr_header *xh = xs->header; 3911 u16 count = le16_to_cpu(xh->xh_count), start; 3912 size_t blocksize = inode->i_sb->s_blocksize; 3913 char *val; 3914 size_t offs, size, new_size; 3915 3916 last = &xh->xh_entries[count]; 3917 if (!xs->not_found) { 3918 xe = xs->here; 3919 offs = le16_to_cpu(xe->xe_name_offset); 3920 if (ocfs2_xattr_is_local(xe)) 3921 size = OCFS2_XATTR_SIZE(name_len) + 3922 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3923 else 3924 size = OCFS2_XATTR_SIZE(name_len) + 3925 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 3926 3927 /* 3928 * If the new value will be stored outside, xi->value has been 3929 * initalized as an empty ocfs2_xattr_value_root, and the same 3930 * goes with xi->value_len, so we can set new_size safely here. 3931 * See ocfs2_xattr_set_in_bucket. 3932 */ 3933 new_size = OCFS2_XATTR_SIZE(name_len) + 3934 OCFS2_XATTR_SIZE(xi->value_len); 3935 3936 le16_add_cpu(&xh->xh_name_value_len, -size); 3937 if (xi->value) { 3938 if (new_size > size) 3939 goto set_new_name_value; 3940 3941 /* Now replace the old value with new one. */ 3942 if (local) 3943 xe->xe_value_size = cpu_to_le64(xi->value_len); 3944 else 3945 xe->xe_value_size = 0; 3946 3947 val = ocfs2_xattr_bucket_get_val(inode, 3948 &xs->bucket, offs); 3949 memset(val + OCFS2_XATTR_SIZE(name_len), 0, 3950 size - OCFS2_XATTR_SIZE(name_len)); 3951 if (OCFS2_XATTR_SIZE(xi->value_len) > 0) 3952 memcpy(val + OCFS2_XATTR_SIZE(name_len), 3953 xi->value, xi->value_len); 3954 3955 le16_add_cpu(&xh->xh_name_value_len, new_size); 3956 ocfs2_xattr_set_local(xe, local); 3957 return; 3958 } else { 3959 /* Remove the old entry. */ 3960 last -= 1; 3961 memmove(xe, xe + 1, 3962 (void *)last - (void *)xe); 3963 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 3964 le16_add_cpu(&xh->xh_count, -1); 3965 if (xh->xh_count == 0 && is_empty) 3966 *is_empty = 1; 3967 return; 3968 } 3969 } else { 3970 /* find a new entry for insert. */ 3971 int low = 0, high = count - 1, tmp; 3972 struct ocfs2_xattr_entry *tmp_xe; 3973 3974 while (low <= high) { 3975 tmp = (low + high) / 2; 3976 tmp_xe = &xh->xh_entries[tmp]; 3977 3978 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash)) 3979 low = tmp + 1; 3980 else if (name_hash < 3981 le32_to_cpu(tmp_xe->xe_name_hash)) 3982 high = tmp - 1; 3983 else 3984 break; 3985 } 3986 3987 xe = &xh->xh_entries[low]; 3988 if (low != count) 3989 memmove(xe + 1, xe, (void *)last - (void *)xe); 3990 3991 le16_add_cpu(&xh->xh_count, 1); 3992 memset(xe, 0, sizeof(struct ocfs2_xattr_entry)); 3993 xe->xe_name_hash = cpu_to_le32(name_hash); 3994 xe->xe_name_len = name_len; 3995 ocfs2_xattr_set_type(xe, xi->name_index); 3996 } 3997 3998 set_new_name_value: 3999 /* Insert the new name+value. */ 4000 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len); 4001 4002 /* 4003 * We must make sure that the name/value pair 4004 * exists in the same block. 4005 */ 4006 offs = le16_to_cpu(xh->xh_free_start); 4007 start = offs - size; 4008 4009 if (start >> inode->i_sb->s_blocksize_bits != 4010 (offs - 1) >> inode->i_sb->s_blocksize_bits) { 4011 offs = offs - offs % blocksize; 4012 xh->xh_free_start = cpu_to_le16(offs); 4013 } 4014 4015 val = ocfs2_xattr_bucket_get_val(inode, 4016 &xs->bucket, offs - size); 4017 xe->xe_name_offset = cpu_to_le16(offs - size); 4018 4019 memset(val, 0, size); 4020 memcpy(val, xi->name, name_len); 4021 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); 4022 4023 xe->xe_value_size = cpu_to_le64(xi->value_len); 4024 ocfs2_xattr_set_local(xe, local); 4025 xs->here = xe; 4026 le16_add_cpu(&xh->xh_free_start, -size); 4027 le16_add_cpu(&xh->xh_name_value_len, size); 4028 4029 return; 4030 } 4031 4032 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode, 4033 handle_t *handle, 4034 struct ocfs2_xattr_search *xs, 4035 struct buffer_head **bhs, 4036 u16 bh_num) 4037 { 4038 int ret = 0, off, block_off; 4039 struct ocfs2_xattr_entry *xe = xs->here; 4040 4041 /* 4042 * First calculate all the blocks we should journal_access 4043 * and journal_dirty. The first block should always be touched. 4044 */ 4045 ret = ocfs2_journal_dirty(handle, bhs[0]); 4046 if (ret) 4047 mlog_errno(ret); 4048 4049 /* calc the data. */ 4050 off = le16_to_cpu(xe->xe_name_offset); 4051 block_off = off >> inode->i_sb->s_blocksize_bits; 4052 ret = ocfs2_journal_dirty(handle, bhs[block_off]); 4053 if (ret) 4054 mlog_errno(ret); 4055 4056 return ret; 4057 } 4058 4059 /* 4060 * Set the xattr entry in the specified bucket. 4061 * The bucket is indicated by xs->bucket and it should have the enough 4062 * space for the xattr insertion. 4063 */ 4064 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode, 4065 struct ocfs2_xattr_info *xi, 4066 struct ocfs2_xattr_search *xs, 4067 u32 name_hash, 4068 int local, 4069 int *bucket_empty) 4070 { 4071 int i, ret; 4072 handle_t *handle = NULL; 4073 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4074 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4075 4076 mlog(0, "Set xattr entry len = %d index = %d in bucket %llu\n", 4077 xi->value_len, xi->name_index, 4078 (unsigned long long)xs->bucket.bhs[0]->b_blocknr); 4079 4080 if (!xs->bucket.bhs[1]) { 4081 ret = ocfs2_read_blocks(osb, 4082 xs->bucket.bhs[0]->b_blocknr + 1, 4083 blk_per_bucket - 1, &xs->bucket.bhs[1], 4084 OCFS2_BH_CACHED, inode); 4085 if (ret) { 4086 mlog_errno(ret); 4087 goto out; 4088 } 4089 } 4090 4091 handle = ocfs2_start_trans(osb, blk_per_bucket); 4092 if (IS_ERR(handle)) { 4093 ret = PTR_ERR(handle); 4094 handle = NULL; 4095 mlog_errno(ret); 4096 goto out; 4097 } 4098 4099 for (i = 0; i < blk_per_bucket; i++) { 4100 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i], 4101 OCFS2_JOURNAL_ACCESS_WRITE); 4102 if (ret < 0) { 4103 mlog_errno(ret); 4104 goto out; 4105 } 4106 } 4107 4108 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, 4109 local, bucket_empty); 4110 4111 /*Only dirty the blocks we have touched in set xattr. */ 4112 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs, 4113 xs->bucket.bhs, blk_per_bucket); 4114 if (ret) 4115 mlog_errno(ret); 4116 out: 4117 ocfs2_commit_trans(osb, handle); 4118 4119 return ret; 4120 } 4121 4122 static int ocfs2_xattr_value_update_size(struct inode *inode, 4123 struct buffer_head *xe_bh, 4124 struct ocfs2_xattr_entry *xe, 4125 u64 new_size) 4126 { 4127 int ret; 4128 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4129 handle_t *handle = NULL; 4130 4131 handle = ocfs2_start_trans(osb, 1); 4132 if (handle == NULL) { 4133 ret = -ENOMEM; 4134 mlog_errno(ret); 4135 goto out; 4136 } 4137 4138 ret = ocfs2_journal_access(handle, inode, xe_bh, 4139 OCFS2_JOURNAL_ACCESS_WRITE); 4140 if (ret < 0) { 4141 mlog_errno(ret); 4142 goto out_commit; 4143 } 4144 4145 xe->xe_value_size = cpu_to_le64(new_size); 4146 4147 ret = ocfs2_journal_dirty(handle, xe_bh); 4148 if (ret < 0) 4149 mlog_errno(ret); 4150 4151 out_commit: 4152 ocfs2_commit_trans(osb, handle); 4153 out: 4154 return ret; 4155 } 4156 4157 /* 4158 * Truncate the specified xe_off entry in xattr bucket. 4159 * bucket is indicated by header_bh and len is the new length. 4160 * Both the ocfs2_xattr_value_root and the entry will be updated here. 4161 * 4162 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed. 4163 */ 4164 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode, 4165 struct buffer_head *header_bh, 4166 int xe_off, 4167 int len) 4168 { 4169 int ret, offset; 4170 u64 value_blk; 4171 struct buffer_head *value_bh = NULL; 4172 struct ocfs2_xattr_value_root *xv; 4173 struct ocfs2_xattr_entry *xe; 4174 struct ocfs2_xattr_header *xh = 4175 (struct ocfs2_xattr_header *)header_bh->b_data; 4176 size_t blocksize = inode->i_sb->s_blocksize; 4177 4178 xe = &xh->xh_entries[xe_off]; 4179 4180 BUG_ON(!xe || ocfs2_xattr_is_local(xe)); 4181 4182 offset = le16_to_cpu(xe->xe_name_offset) + 4183 OCFS2_XATTR_SIZE(xe->xe_name_len); 4184 4185 value_blk = offset / blocksize; 4186 4187 /* We don't allow ocfs2_xattr_value to be stored in different block. */ 4188 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize); 4189 value_blk += header_bh->b_blocknr; 4190 4191 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk, 4192 &value_bh, OCFS2_BH_CACHED, inode); 4193 if (ret) { 4194 mlog_errno(ret); 4195 goto out; 4196 } 4197 4198 xv = (struct ocfs2_xattr_value_root *) 4199 (value_bh->b_data + offset % blocksize); 4200 4201 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n", 4202 xe_off, (unsigned long long)header_bh->b_blocknr, len); 4203 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len); 4204 if (ret) { 4205 mlog_errno(ret); 4206 goto out; 4207 } 4208 4209 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len); 4210 if (ret) { 4211 mlog_errno(ret); 4212 goto out; 4213 } 4214 4215 out: 4216 brelse(value_bh); 4217 return ret; 4218 } 4219 4220 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode, 4221 struct ocfs2_xattr_search *xs, 4222 int len) 4223 { 4224 int ret, offset; 4225 struct ocfs2_xattr_entry *xe = xs->here; 4226 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base; 4227 4228 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe)); 4229 4230 offset = xe - xh->xh_entries; 4231 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0], 4232 offset, len); 4233 if (ret) 4234 mlog_errno(ret); 4235 4236 return ret; 4237 } 4238 4239 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode, 4240 struct ocfs2_xattr_search *xs, 4241 char *val, 4242 int value_len) 4243 { 4244 int offset; 4245 struct ocfs2_xattr_value_root *xv; 4246 struct ocfs2_xattr_entry *xe = xs->here; 4247 4248 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe)); 4249 4250 offset = le16_to_cpu(xe->xe_name_offset) + 4251 OCFS2_XATTR_SIZE(xe->xe_name_len); 4252 4253 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset); 4254 4255 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len); 4256 } 4257 4258 /* 4259 * Remove the xattr bucket pointed by bucket_bh. 4260 * All the buckets after it in the same xattr extent rec will be 4261 * move forward one by one. 4262 */ 4263 static int ocfs2_rm_xattr_bucket(struct inode *inode, 4264 struct buffer_head *first_bh, 4265 struct ocfs2_xattr_bucket *bucket) 4266 { 4267 int ret = 0, credits; 4268 struct ocfs2_xattr_header *xh = 4269 (struct ocfs2_xattr_header *)first_bh->b_data; 4270 u16 bucket_num = le16_to_cpu(xh->xh_num_buckets); 4271 u64 end, start = bucket->bhs[0]->b_blocknr; 4272 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4273 handle_t *handle; 4274 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4275 4276 end = first_bh->b_blocknr + (bucket_num - 1) * blk_per_bucket; 4277 4278 mlog(0, "rm xattr bucket %llu\n", start); 4279 /* 4280 * We need to update the first xattr_header and all the buckets starting 4281 * from start in this xattr rec. 4282 * 4283 * XXX: Should we empty the old last bucket here? 4284 */ 4285 credits = 1 + end - start; 4286 handle = ocfs2_start_trans(osb, credits); 4287 if (IS_ERR(handle)) { 4288 ret = PTR_ERR(handle); 4289 mlog_errno(ret); 4290 return ret; 4291 } 4292 4293 ret = ocfs2_journal_access(handle, inode, first_bh, 4294 OCFS2_JOURNAL_ACCESS_WRITE); 4295 if (ret) { 4296 mlog_errno(ret); 4297 goto out_commit; 4298 } 4299 4300 4301 while (start < end) { 4302 ret = ocfs2_cp_xattr_bucket(inode, handle, 4303 start + blk_per_bucket, 4304 start, 0); 4305 if (ret) { 4306 mlog_errno(ret); 4307 goto out_commit; 4308 } 4309 start += blk_per_bucket; 4310 } 4311 4312 /* update the first_bh. */ 4313 xh->xh_num_buckets = cpu_to_le16(bucket_num - 1); 4314 ocfs2_journal_dirty(handle, first_bh); 4315 4316 out_commit: 4317 ocfs2_commit_trans(osb, handle); 4318 return ret; 4319 } 4320 4321 static int ocfs2_rm_xattr_cluster(struct inode *inode, 4322 struct buffer_head *root_bh, 4323 u64 blkno, 4324 u32 cpos, 4325 u32 len) 4326 { 4327 int ret; 4328 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4329 struct inode *tl_inode = osb->osb_tl_inode; 4330 handle_t *handle; 4331 struct ocfs2_xattr_block *xb = 4332 (struct ocfs2_xattr_block *)root_bh->b_data; 4333 struct ocfs2_extent_list *root_el = &xb->xb_attrs.xb_root.xt_list; 4334 struct ocfs2_alloc_context *meta_ac = NULL; 4335 struct ocfs2_cached_dealloc_ctxt dealloc; 4336 4337 ocfs2_init_dealloc_ctxt(&dealloc); 4338 4339 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n", 4340 cpos, len, (unsigned long long)blkno); 4341 4342 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len); 4343 4344 ret = ocfs2_lock_allocators(inode, root_bh, root_el, 4345 0, 1, NULL, &meta_ac, 4346 OCFS2_XATTR_TREE_EXTENT, NULL); 4347 if (ret) { 4348 mlog_errno(ret); 4349 return ret; 4350 } 4351 4352 mutex_lock(&tl_inode->i_mutex); 4353 4354 if (ocfs2_truncate_log_needs_flush(osb)) { 4355 ret = __ocfs2_flush_truncate_log(osb); 4356 if (ret < 0) { 4357 mlog_errno(ret); 4358 goto out; 4359 } 4360 } 4361 4362 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 4363 if (handle == NULL) { 4364 ret = -ENOMEM; 4365 mlog_errno(ret); 4366 goto out; 4367 } 4368 4369 ret = ocfs2_journal_access(handle, inode, root_bh, 4370 OCFS2_JOURNAL_ACCESS_WRITE); 4371 if (ret) { 4372 mlog_errno(ret); 4373 goto out_commit; 4374 } 4375 4376 ret = ocfs2_remove_extent(inode, root_bh, cpos, len, handle, meta_ac, 4377 &dealloc, OCFS2_XATTR_TREE_EXTENT, NULL); 4378 if (ret) { 4379 mlog_errno(ret); 4380 goto out_commit; 4381 } 4382 4383 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len); 4384 4385 ret = ocfs2_journal_dirty(handle, root_bh); 4386 if (ret) { 4387 mlog_errno(ret); 4388 goto out_commit; 4389 } 4390 4391 ret = ocfs2_truncate_log_append(osb, handle, blkno, len); 4392 if (ret) 4393 mlog_errno(ret); 4394 4395 out_commit: 4396 ocfs2_commit_trans(osb, handle); 4397 out: 4398 ocfs2_schedule_truncate_log_flush(osb, 1); 4399 4400 mutex_unlock(&tl_inode->i_mutex); 4401 4402 if (meta_ac) 4403 ocfs2_free_alloc_context(meta_ac); 4404 4405 ocfs2_run_deallocs(osb, &dealloc); 4406 4407 return ret; 4408 } 4409 4410 /* 4411 * Free the xattr bucket indicated by xs->bucket and if all the buckets 4412 * in the clusters is free, free the clusters also. 4413 */ 4414 static int ocfs2_xattr_bucket_shrink(struct inode *inode, 4415 struct ocfs2_xattr_info *xi, 4416 struct ocfs2_xattr_search *xs, 4417 u32 name_hash) 4418 { 4419 int ret; 4420 u32 e_cpos, num_clusters; 4421 u64 p_blkno; 4422 struct buffer_head *first_bh = NULL; 4423 struct ocfs2_xattr_header *first_xh; 4424 struct ocfs2_xattr_block *xb = 4425 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 4426 4427 BUG_ON(xs->header->xh_count != 0); 4428 4429 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4430 &e_cpos, &num_clusters, 4431 &xb->xb_attrs.xb_root.xt_list); 4432 if (ret) { 4433 mlog_errno(ret); 4434 return ret; 4435 } 4436 4437 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, 4438 &first_bh, OCFS2_BH_CACHED, inode); 4439 if (ret) { 4440 mlog_errno(ret); 4441 return ret; 4442 } 4443 4444 ret = ocfs2_rm_xattr_bucket(inode, first_bh, &xs->bucket); 4445 if (ret) { 4446 mlog_errno(ret); 4447 goto out; 4448 } 4449 4450 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 4451 if (first_xh->xh_num_buckets == 0) 4452 ret = ocfs2_rm_xattr_cluster(inode, xs->xattr_bh, 4453 p_blkno, e_cpos, 4454 num_clusters); 4455 4456 out: 4457 brelse(first_bh); 4458 return ret; 4459 } 4460 4461 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode, 4462 struct ocfs2_xattr_search *xs) 4463 { 4464 handle_t *handle = NULL; 4465 struct ocfs2_xattr_header *xh = xs->bucket.xh; 4466 struct ocfs2_xattr_entry *last = &xh->xh_entries[ 4467 le16_to_cpu(xh->xh_count) - 1]; 4468 int ret = 0; 4469 4470 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1); 4471 if (IS_ERR(handle)) { 4472 ret = PTR_ERR(handle); 4473 mlog_errno(ret); 4474 return; 4475 } 4476 4477 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0], 4478 OCFS2_JOURNAL_ACCESS_WRITE); 4479 if (ret) { 4480 mlog_errno(ret); 4481 goto out_commit; 4482 } 4483 4484 /* Remove the old entry. */ 4485 memmove(xs->here, xs->here + 1, 4486 (void *)last - (void *)xs->here); 4487 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 4488 le16_add_cpu(&xh->xh_count, -1); 4489 4490 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]); 4491 if (ret < 0) 4492 mlog_errno(ret); 4493 out_commit: 4494 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 4495 } 4496 4497 /* 4498 * Set the xattr name/value in the bucket specified in xs. 4499 * 4500 * As the new value in xi may be stored in the bucket or in an outside cluster, 4501 * we divide the whole process into 3 steps: 4502 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket) 4503 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs) 4504 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside) 4505 * 4. If the clusters for the new outside value can't be allocated, we need 4506 * to free the xattr we allocated in set. 4507 */ 4508 static int ocfs2_xattr_set_in_bucket(struct inode *inode, 4509 struct ocfs2_xattr_info *xi, 4510 struct ocfs2_xattr_search *xs) 4511 { 4512 int ret, local = 1, bucket_empty = 0; 4513 size_t value_len; 4514 char *val = (char *)xi->value; 4515 struct ocfs2_xattr_entry *xe = xs->here; 4516 u32 name_hash = ocfs2_xattr_hash_by_name(inode, 4517 xi->name_index, xi->name); 4518 4519 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) { 4520 /* 4521 * We need to truncate the xattr storage first. 4522 * 4523 * If both the old and new value are stored to 4524 * outside block, we only need to truncate 4525 * the storage and then set the value outside. 4526 * 4527 * If the new value should be stored within block, 4528 * we should free all the outside block first and 4529 * the modification to the xattr block will be done 4530 * by following steps. 4531 */ 4532 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4533 value_len = xi->value_len; 4534 else 4535 value_len = 0; 4536 4537 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4538 value_len); 4539 if (ret) 4540 goto out; 4541 4542 if (value_len) 4543 goto set_value_outside; 4544 } 4545 4546 value_len = xi->value_len; 4547 /* So we have to handle the inside block change now. */ 4548 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4549 /* 4550 * If the new value will be stored outside of block, 4551 * initalize a new empty value root and insert it first. 4552 */ 4553 local = 0; 4554 xi->value = &def_xv; 4555 xi->value_len = OCFS2_XATTR_ROOT_SIZE; 4556 } 4557 4558 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, 4559 local, &bucket_empty); 4560 if (ret) { 4561 mlog_errno(ret); 4562 goto out; 4563 } 4564 4565 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4566 /* allocate the space now for the outside block storage. */ 4567 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4568 value_len); 4569 if (ret) { 4570 mlog_errno(ret); 4571 4572 if (xs->not_found) { 4573 /* 4574 * We can't allocate enough clusters for outside 4575 * storage and we have allocated xattr already, 4576 * so need to remove it. 4577 */ 4578 ocfs2_xattr_bucket_remove_xs(inode, xs); 4579 } 4580 goto out; 4581 } 4582 } else { 4583 if (bucket_empty) 4584 ret = ocfs2_xattr_bucket_shrink(inode, xi, 4585 xs, name_hash); 4586 goto out; 4587 } 4588 4589 set_value_outside: 4590 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len); 4591 out: 4592 return ret; 4593 } 4594 4595 /* check whether the xattr bucket is filled up with the same hash value. */ 4596 static int ocfs2_check_xattr_bucket_collision(struct inode *inode, 4597 struct ocfs2_xattr_bucket *bucket) 4598 { 4599 struct ocfs2_xattr_header *xh = bucket->xh; 4600 4601 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash == 4602 xh->xh_entries[0].xe_name_hash) { 4603 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, " 4604 "hash = %u\n", 4605 (unsigned long long)bucket->bhs[0]->b_blocknr, 4606 le32_to_cpu(xh->xh_entries[0].xe_name_hash)); 4607 return -ENOSPC; 4608 } 4609 4610 return 0; 4611 } 4612 4613 static int ocfs2_xattr_set_entry_index_block(struct inode *inode, 4614 struct ocfs2_xattr_info *xi, 4615 struct ocfs2_xattr_search *xs) 4616 { 4617 struct ocfs2_xattr_header *xh; 4618 struct ocfs2_xattr_entry *xe; 4619 u16 count, header_size, xh_free_start; 4620 int i, free, max_free, need, old; 4621 size_t value_size = 0, name_len = strlen(xi->name); 4622 size_t blocksize = inode->i_sb->s_blocksize; 4623 int ret, allocation = 0; 4624 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4625 4626 mlog_entry("Set xattr %s in xattr index block\n", xi->name); 4627 4628 try_again: 4629 xh = xs->header; 4630 count = le16_to_cpu(xh->xh_count); 4631 xh_free_start = le16_to_cpu(xh->xh_free_start); 4632 header_size = sizeof(struct ocfs2_xattr_header) + 4633 count * sizeof(struct ocfs2_xattr_entry); 4634 max_free = OCFS2_XATTR_BUCKET_SIZE - 4635 le16_to_cpu(xh->xh_name_value_len) - header_size; 4636 4637 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size " 4638 "of %u which exceed block size\n", 4639 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4640 header_size); 4641 4642 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4643 value_size = OCFS2_XATTR_ROOT_SIZE; 4644 else if (xi->value) 4645 value_size = OCFS2_XATTR_SIZE(xi->value_len); 4646 4647 if (xs->not_found) 4648 need = sizeof(struct ocfs2_xattr_entry) + 4649 OCFS2_XATTR_SIZE(name_len) + value_size; 4650 else { 4651 need = value_size + OCFS2_XATTR_SIZE(name_len); 4652 4653 /* 4654 * We only replace the old value if the new length is smaller 4655 * than the old one. Otherwise we will allocate new space in the 4656 * bucket to store it. 4657 */ 4658 xe = xs->here; 4659 if (ocfs2_xattr_is_local(xe)) 4660 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 4661 else 4662 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 4663 4664 if (old >= value_size) 4665 need = 0; 4666 } 4667 4668 free = xh_free_start - header_size; 4669 /* 4670 * We need to make sure the new name/value pair 4671 * can exist in the same block. 4672 */ 4673 if (xh_free_start % blocksize < need) 4674 free -= xh_free_start % blocksize; 4675 4676 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, " 4677 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len =" 4678 " %u\n", xs->not_found, 4679 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4680 free, need, max_free, le16_to_cpu(xh->xh_free_start), 4681 le16_to_cpu(xh->xh_name_value_len)); 4682 4683 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4684 if (need <= max_free && 4685 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4686 /* 4687 * We can create the space by defragment. Since only the 4688 * name/value will be moved, the xe shouldn't be changed 4689 * in xs. 4690 */ 4691 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket); 4692 if (ret) { 4693 mlog_errno(ret); 4694 goto out; 4695 } 4696 4697 xh_free_start = le16_to_cpu(xh->xh_free_start); 4698 free = xh_free_start - header_size; 4699 if (xh_free_start % blocksize < need) 4700 free -= xh_free_start % blocksize; 4701 4702 if (free >= need) 4703 goto xattr_set; 4704 4705 mlog(0, "Can't get enough space for xattr insert by " 4706 "defragment. Need %u bytes, but we have %d, so " 4707 "allocate new bucket for it.\n", need, free); 4708 } 4709 4710 /* 4711 * We have to add new buckets or clusters and one 4712 * allocation should leave us enough space for insert. 4713 */ 4714 BUG_ON(allocation); 4715 4716 /* 4717 * We do not allow for overlapping ranges between buckets. And 4718 * the maximum number of collisions we will allow for then is 4719 * one bucket's worth, so check it here whether we need to 4720 * add a new bucket for the insert. 4721 */ 4722 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket); 4723 if (ret) { 4724 mlog_errno(ret); 4725 goto out; 4726 } 4727 4728 ret = ocfs2_add_new_xattr_bucket(inode, 4729 xs->xattr_bh, 4730 xs->bucket.bhs[0]); 4731 if (ret) { 4732 mlog_errno(ret); 4733 goto out; 4734 } 4735 4736 for (i = 0; i < blk_per_bucket; i++) 4737 brelse(xs->bucket.bhs[i]); 4738 4739 memset(&xs->bucket, 0, sizeof(xs->bucket)); 4740 4741 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh, 4742 xi->name_index, 4743 xi->name, xs); 4744 if (ret && ret != -ENODATA) 4745 goto out; 4746 xs->not_found = ret; 4747 allocation = 1; 4748 goto try_again; 4749 } 4750 4751 xattr_set: 4752 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs); 4753 out: 4754 mlog_exit(ret); 4755 return ret; 4756 } 4757 4758 static int ocfs2_delete_xattr_in_bucket(struct inode *inode, 4759 struct ocfs2_xattr_bucket *bucket, 4760 void *para) 4761 { 4762 int ret = 0; 4763 struct ocfs2_xattr_header *xh = bucket->xh; 4764 u16 i; 4765 struct ocfs2_xattr_entry *xe; 4766 4767 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 4768 xe = &xh->xh_entries[i]; 4769 if (ocfs2_xattr_is_local(xe)) 4770 continue; 4771 4772 ret = ocfs2_xattr_bucket_value_truncate(inode, 4773 bucket->bhs[0], 4774 i, 0); 4775 if (ret) { 4776 mlog_errno(ret); 4777 break; 4778 } 4779 } 4780 4781 return ret; 4782 } 4783 4784 static int ocfs2_delete_xattr_index_block(struct inode *inode, 4785 struct buffer_head *xb_bh) 4786 { 4787 struct ocfs2_xattr_block *xb = 4788 (struct ocfs2_xattr_block *)xb_bh->b_data; 4789 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 4790 int ret = 0; 4791 u32 name_hash = UINT_MAX, e_cpos, num_clusters; 4792 u64 p_blkno; 4793 4794 if (le16_to_cpu(el->l_next_free_rec) == 0) 4795 return 0; 4796 4797 while (name_hash > 0) { 4798 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4799 &e_cpos, &num_clusters, el); 4800 if (ret) { 4801 mlog_errno(ret); 4802 goto out; 4803 } 4804 4805 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 4806 ocfs2_delete_xattr_in_bucket, 4807 NULL); 4808 if (ret) { 4809 mlog_errno(ret); 4810 goto out; 4811 } 4812 4813 ret = ocfs2_rm_xattr_cluster(inode, xb_bh, 4814 p_blkno, e_cpos, num_clusters); 4815 if (ret) { 4816 mlog_errno(ret); 4817 break; 4818 } 4819 4820 if (e_cpos == 0) 4821 break; 4822 4823 name_hash = e_cpos - 1; 4824 } 4825 4826 out: 4827 return ret; 4828 } 4829