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 (int)((char *)xe - (char *)xh), 3268 (int)((char *)xh->xh_entries - (char *)xh)); 3269 memmove((char *)xh->xh_entries, (char *)xe, len); 3270 xe = &xh->xh_entries[count - start]; 3271 len = sizeof(struct ocfs2_xattr_entry) * start; 3272 memset((char *)xe, 0, len); 3273 3274 le16_add_cpu(&xh->xh_count, -start); 3275 le16_add_cpu(&xh->xh_name_value_len, -name_value_len); 3276 3277 /* Calculate xh_free_start for the new bucket. */ 3278 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); 3279 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 3280 xe = &xh->xh_entries[i]; 3281 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3282 if (ocfs2_xattr_is_local(xe)) 3283 xe_len += 3284 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3285 else 3286 xe_len += OCFS2_XATTR_ROOT_SIZE; 3287 if (le16_to_cpu(xe->xe_name_offset) < 3288 le16_to_cpu(xh->xh_free_start)) 3289 xh->xh_free_start = xe->xe_name_offset; 3290 } 3291 3292 /* set xh->xh_num_buckets for the new xh. */ 3293 if (new_bucket_head) 3294 xh->xh_num_buckets = cpu_to_le16(1); 3295 else 3296 xh->xh_num_buckets = 0; 3297 3298 for (i = 0; i < blk_per_bucket; i++) { 3299 ocfs2_journal_dirty(handle, t_bhs[i]); 3300 if (ret) 3301 mlog_errno(ret); 3302 } 3303 3304 /* store the first_hash of the new bucket. */ 3305 if (first_hash) 3306 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3307 3308 /* 3309 * Now only update the 1st block of the old bucket. 3310 * Please note that the entry has been sorted already above. 3311 */ 3312 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data; 3313 memset(&xh->xh_entries[start], 0, 3314 sizeof(struct ocfs2_xattr_entry) * (count - start)); 3315 xh->xh_count = cpu_to_le16(start); 3316 xh->xh_free_start = cpu_to_le16(name_offset); 3317 xh->xh_name_value_len = cpu_to_le16(name_value_len); 3318 3319 ocfs2_journal_dirty(handle, s_bhs[0]); 3320 if (ret) 3321 mlog_errno(ret); 3322 3323 out: 3324 if (s_bhs) { 3325 for (i = 0; i < blk_per_bucket; i++) 3326 brelse(s_bhs[i]); 3327 } 3328 kfree(s_bhs); 3329 3330 if (t_bhs) { 3331 for (i = 0; i < blk_per_bucket; i++) 3332 brelse(t_bhs[i]); 3333 } 3334 kfree(t_bhs); 3335 3336 return ret; 3337 } 3338 3339 /* 3340 * Copy xattr from one bucket to another bucket. 3341 * 3342 * The caller must make sure that the journal transaction 3343 * has enough space for journaling. 3344 */ 3345 static int ocfs2_cp_xattr_bucket(struct inode *inode, 3346 handle_t *handle, 3347 u64 s_blkno, 3348 u64 t_blkno, 3349 int t_is_new) 3350 { 3351 int ret, i; 3352 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3353 int blocksize = inode->i_sb->s_blocksize; 3354 struct buffer_head **s_bhs, **t_bhs = NULL; 3355 3356 BUG_ON(s_blkno == t_blkno); 3357 3358 mlog(0, "cp bucket %llu to %llu, target is %d\n", 3359 s_blkno, t_blkno, t_is_new); 3360 3361 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3362 GFP_NOFS); 3363 if (!s_bhs) 3364 return -ENOMEM; 3365 3366 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0); 3367 if (ret) 3368 goto out; 3369 3370 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3371 GFP_NOFS); 3372 if (!t_bhs) { 3373 ret = -ENOMEM; 3374 goto out; 3375 } 3376 3377 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new); 3378 if (ret) 3379 goto out; 3380 3381 for (i = 0; i < blk_per_bucket; i++) { 3382 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3383 OCFS2_JOURNAL_ACCESS_WRITE); 3384 if (ret) 3385 goto out; 3386 } 3387 3388 for (i = 0; i < blk_per_bucket; i++) { 3389 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3390 ocfs2_journal_dirty(handle, t_bhs[i]); 3391 } 3392 3393 out: 3394 if (s_bhs) { 3395 for (i = 0; i < blk_per_bucket; i++) 3396 brelse(s_bhs[i]); 3397 } 3398 kfree(s_bhs); 3399 3400 if (t_bhs) { 3401 for (i = 0; i < blk_per_bucket; i++) 3402 brelse(t_bhs[i]); 3403 } 3404 kfree(t_bhs); 3405 3406 return ret; 3407 } 3408 3409 /* 3410 * Copy one xattr cluster from src_blk to to_blk. 3411 * The to_blk will become the first bucket header of the cluster, so its 3412 * xh_num_buckets will be initialized as the bucket num in the cluster. 3413 */ 3414 static int ocfs2_cp_xattr_cluster(struct inode *inode, 3415 handle_t *handle, 3416 struct buffer_head *first_bh, 3417 u64 src_blk, 3418 u64 to_blk, 3419 u32 *first_hash) 3420 { 3421 int i, ret, credits; 3422 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3423 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3424 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3425 struct buffer_head *bh = NULL; 3426 struct ocfs2_xattr_header *xh; 3427 u64 to_blk_start = to_blk; 3428 3429 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk); 3430 3431 /* 3432 * We need to update the new cluster and 1 more for the update of 3433 * the 1st bucket of the previous extent rec. 3434 */ 3435 credits = bpc + 1; 3436 ret = ocfs2_extend_trans(handle, credits); 3437 if (ret) { 3438 mlog_errno(ret); 3439 goto out; 3440 } 3441 3442 ret = ocfs2_journal_access(handle, inode, first_bh, 3443 OCFS2_JOURNAL_ACCESS_WRITE); 3444 if (ret) { 3445 mlog_errno(ret); 3446 goto out; 3447 } 3448 3449 for (i = 0; i < num_buckets; i++) { 3450 ret = ocfs2_cp_xattr_bucket(inode, handle, 3451 src_blk, to_blk, 1); 3452 if (ret) { 3453 mlog_errno(ret); 3454 goto out; 3455 } 3456 3457 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3458 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3459 } 3460 3461 /* update the old bucket header. */ 3462 xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3463 le16_add_cpu(&xh->xh_num_buckets, -num_buckets); 3464 3465 ocfs2_journal_dirty(handle, first_bh); 3466 3467 /* update the new bucket header. */ 3468 ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode); 3469 if (ret < 0) { 3470 mlog_errno(ret); 3471 goto out; 3472 } 3473 3474 ret = ocfs2_journal_access(handle, inode, bh, 3475 OCFS2_JOURNAL_ACCESS_WRITE); 3476 if (ret) { 3477 mlog_errno(ret); 3478 goto out; 3479 } 3480 3481 xh = (struct ocfs2_xattr_header *)bh->b_data; 3482 xh->xh_num_buckets = cpu_to_le16(num_buckets); 3483 3484 ocfs2_journal_dirty(handle, bh); 3485 3486 if (first_hash) 3487 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3488 out: 3489 brelse(bh); 3490 return ret; 3491 } 3492 3493 /* 3494 * Move half of the xattrs in this cluster to the new cluster. 3495 * This function should only be called when bucket size == cluster size. 3496 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead. 3497 */ 3498 static int ocfs2_half_xattr_cluster(struct inode *inode, 3499 handle_t *handle, 3500 u64 prev_blk, 3501 u64 new_blk, 3502 u32 *first_hash) 3503 { 3504 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3505 int ret, credits = 2 * blk_per_bucket; 3506 3507 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize); 3508 3509 ret = ocfs2_extend_trans(handle, credits); 3510 if (ret) { 3511 mlog_errno(ret); 3512 return ret; 3513 } 3514 3515 /* Move half of the xattr in start_blk to the next bucket. */ 3516 return ocfs2_half_xattr_bucket(inode, handle, prev_blk, 3517 new_blk, first_hash, 1); 3518 } 3519 3520 /* 3521 * Move some xattrs from the old cluster to the new one since they are not 3522 * contiguous in ocfs2 xattr tree. 3523 * 3524 * new_blk starts a new separate cluster, and we will move some xattrs from 3525 * prev_blk to it. v_start will be set as the first name hash value in this 3526 * new cluster so that it can be used as e_cpos during tree insertion and 3527 * don't collide with our original b-tree operations. first_bh and header_bh 3528 * will also be updated since they will be used in ocfs2_extend_xattr_bucket 3529 * to extend the insert bucket. 3530 * 3531 * The problem is how much xattr should we move to the new one and when should 3532 * we update first_bh and header_bh? 3533 * 1. If cluster size > bucket size, that means the previous cluster has more 3534 * than 1 bucket, so just move half nums of bucket into the new cluster and 3535 * update the first_bh and header_bh if the insert bucket has been moved 3536 * to the new cluster. 3537 * 2. If cluster_size == bucket_size: 3538 * a) If the previous extent rec has more than one cluster and the insert 3539 * place isn't in the last cluster, copy the entire last cluster to the 3540 * new one. This time, we don't need to upate the first_bh and header_bh 3541 * since they will not be moved into the new cluster. 3542 * b) Otherwise, move the bottom half of the xattrs in the last cluster into 3543 * the new one. And we set the extend flag to zero if the insert place is 3544 * moved into the new allocated cluster since no extend is needed. 3545 */ 3546 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode, 3547 handle_t *handle, 3548 struct buffer_head **first_bh, 3549 struct buffer_head **header_bh, 3550 u64 new_blk, 3551 u64 prev_blk, 3552 u32 prev_clusters, 3553 u32 *v_start, 3554 int *extend) 3555 { 3556 int ret = 0; 3557 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3558 3559 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n", 3560 prev_blk, prev_clusters, new_blk); 3561 3562 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) 3563 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode, 3564 handle, 3565 first_bh, 3566 header_bh, 3567 new_blk, 3568 prev_blk, 3569 prev_clusters, 3570 v_start); 3571 else { 3572 u64 last_blk = prev_blk + bpc * (prev_clusters - 1); 3573 3574 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk) 3575 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh, 3576 last_blk, new_blk, 3577 v_start); 3578 else { 3579 ret = ocfs2_half_xattr_cluster(inode, handle, 3580 last_blk, new_blk, 3581 v_start); 3582 3583 if ((*header_bh)->b_blocknr == last_blk && extend) 3584 *extend = 0; 3585 } 3586 } 3587 3588 return ret; 3589 } 3590 3591 /* 3592 * Add a new cluster for xattr storage. 3593 * 3594 * If the new cluster is contiguous with the previous one, it will be 3595 * appended to the same extent record, and num_clusters will be updated. 3596 * If not, we will insert a new extent for it and move some xattrs in 3597 * the last cluster into the new allocated one. 3598 * We also need to limit the maximum size of a btree leaf, otherwise we'll 3599 * lose the benefits of hashing because we'll have to search large leaves. 3600 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize, 3601 * if it's bigger). 3602 * 3603 * first_bh is the first block of the previous extent rec and header_bh 3604 * indicates the bucket we will insert the new xattrs. They will be updated 3605 * when the header_bh is moved into the new cluster. 3606 */ 3607 static int ocfs2_add_new_xattr_cluster(struct inode *inode, 3608 struct buffer_head *root_bh, 3609 struct buffer_head **first_bh, 3610 struct buffer_head **header_bh, 3611 u32 *num_clusters, 3612 u32 prev_cpos, 3613 u64 prev_blkno, 3614 int *extend) 3615 { 3616 int ret, credits; 3617 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3618 u32 prev_clusters = *num_clusters; 3619 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0; 3620 u64 block; 3621 handle_t *handle = NULL; 3622 struct ocfs2_alloc_context *data_ac = NULL; 3623 struct ocfs2_alloc_context *meta_ac = NULL; 3624 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3625 struct ocfs2_xattr_block *xb = 3626 (struct ocfs2_xattr_block *)root_bh->b_data; 3627 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 3628 struct ocfs2_extent_list *root_el = &xb_root->xt_list; 3629 enum ocfs2_extent_tree_type type = OCFS2_XATTR_TREE_EXTENT; 3630 3631 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, " 3632 "previous xattr blkno = %llu\n", 3633 (unsigned long long)OCFS2_I(inode)->ip_blkno, 3634 prev_cpos, prev_blkno); 3635 3636 ret = ocfs2_lock_allocators(inode, root_bh, root_el, 3637 clusters_to_add, 0, &data_ac, 3638 &meta_ac, type, NULL); 3639 if (ret) { 3640 mlog_errno(ret); 3641 goto leave; 3642 } 3643 3644 credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add); 3645 handle = ocfs2_start_trans(osb, credits); 3646 if (IS_ERR(handle)) { 3647 ret = PTR_ERR(handle); 3648 handle = NULL; 3649 mlog_errno(ret); 3650 goto leave; 3651 } 3652 3653 ret = ocfs2_journal_access(handle, inode, root_bh, 3654 OCFS2_JOURNAL_ACCESS_WRITE); 3655 if (ret < 0) { 3656 mlog_errno(ret); 3657 goto leave; 3658 } 3659 3660 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1, 3661 clusters_to_add, &bit_off, &num_bits); 3662 if (ret < 0) { 3663 if (ret != -ENOSPC) 3664 mlog_errno(ret); 3665 goto leave; 3666 } 3667 3668 BUG_ON(num_bits > clusters_to_add); 3669 3670 block = ocfs2_clusters_to_blocks(osb->sb, bit_off); 3671 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n", 3672 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); 3673 3674 if (prev_blkno + prev_clusters * bpc == block && 3675 (prev_clusters + num_bits) << osb->s_clustersize_bits <= 3676 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) { 3677 /* 3678 * If this cluster is contiguous with the old one and 3679 * adding this new cluster, we don't surpass the limit of 3680 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be 3681 * initialized and used like other buckets in the previous 3682 * cluster. 3683 * So add it as a contiguous one. The caller will handle 3684 * its init process. 3685 */ 3686 v_start = prev_cpos + prev_clusters; 3687 *num_clusters = prev_clusters + num_bits; 3688 mlog(0, "Add contiguous %u clusters to previous extent rec.\n", 3689 num_bits); 3690 } else { 3691 ret = ocfs2_adjust_xattr_cross_cluster(inode, 3692 handle, 3693 first_bh, 3694 header_bh, 3695 block, 3696 prev_blkno, 3697 prev_clusters, 3698 &v_start, 3699 extend); 3700 if (ret) { 3701 mlog_errno(ret); 3702 goto leave; 3703 } 3704 } 3705 3706 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n", 3707 num_bits, block, v_start); 3708 ret = ocfs2_xattr_tree_insert_extent(osb, handle, inode, root_bh, 3709 v_start, block, num_bits, 3710 0, meta_ac); 3711 if (ret < 0) { 3712 mlog_errno(ret); 3713 goto leave; 3714 } 3715 3716 ret = ocfs2_journal_dirty(handle, root_bh); 3717 if (ret < 0) { 3718 mlog_errno(ret); 3719 goto leave; 3720 } 3721 3722 leave: 3723 if (handle) 3724 ocfs2_commit_trans(osb, handle); 3725 if (data_ac) 3726 ocfs2_free_alloc_context(data_ac); 3727 if (meta_ac) 3728 ocfs2_free_alloc_context(meta_ac); 3729 3730 return ret; 3731 } 3732 3733 /* 3734 * Extend a new xattr bucket and move xattrs to the end one by one until 3735 * We meet with start_bh. Only move half of the xattrs to the bucket after it. 3736 */ 3737 static int ocfs2_extend_xattr_bucket(struct inode *inode, 3738 struct buffer_head *first_bh, 3739 struct buffer_head *start_bh, 3740 u32 num_clusters) 3741 { 3742 int ret, credits; 3743 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3744 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3745 u64 start_blk = start_bh->b_blocknr, end_blk; 3746 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb); 3747 handle_t *handle; 3748 struct ocfs2_xattr_header *first_xh = 3749 (struct ocfs2_xattr_header *)first_bh->b_data; 3750 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets); 3751 3752 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting " 3753 "from %llu, len = %u\n", start_blk, 3754 (unsigned long long)first_bh->b_blocknr, num_clusters); 3755 3756 BUG_ON(bucket >= num_buckets); 3757 3758 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket; 3759 3760 /* 3761 * We will touch all the buckets after the start_bh(include it). 3762 * Add one more bucket and modify the first_bh. 3763 */ 3764 credits = end_blk - start_blk + 2 * blk_per_bucket + 1; 3765 handle = ocfs2_start_trans(osb, credits); 3766 if (IS_ERR(handle)) { 3767 ret = PTR_ERR(handle); 3768 handle = NULL; 3769 mlog_errno(ret); 3770 goto out; 3771 } 3772 3773 ret = ocfs2_journal_access(handle, inode, first_bh, 3774 OCFS2_JOURNAL_ACCESS_WRITE); 3775 if (ret) { 3776 mlog_errno(ret); 3777 goto commit; 3778 } 3779 3780 while (end_blk != start_blk) { 3781 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk, 3782 end_blk + blk_per_bucket, 0); 3783 if (ret) 3784 goto commit; 3785 end_blk -= blk_per_bucket; 3786 } 3787 3788 /* Move half of the xattr in start_blk to the next bucket. */ 3789 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk, 3790 start_blk + blk_per_bucket, NULL, 0); 3791 3792 le16_add_cpu(&first_xh->xh_num_buckets, 1); 3793 ocfs2_journal_dirty(handle, first_bh); 3794 3795 commit: 3796 ocfs2_commit_trans(osb, handle); 3797 out: 3798 return ret; 3799 } 3800 3801 /* 3802 * Add new xattr bucket in an extent record and adjust the buckets accordingly. 3803 * xb_bh is the ocfs2_xattr_block. 3804 * We will move all the buckets starting from header_bh to the next place. As 3805 * for this one, half num of its xattrs will be moved to the next one. 3806 * 3807 * We will allocate a new cluster if current cluster is full and adjust 3808 * header_bh and first_bh if the insert place is moved to the new cluster. 3809 */ 3810 static int ocfs2_add_new_xattr_bucket(struct inode *inode, 3811 struct buffer_head *xb_bh, 3812 struct buffer_head *header_bh) 3813 { 3814 struct ocfs2_xattr_header *first_xh = NULL; 3815 struct buffer_head *first_bh = NULL; 3816 struct ocfs2_xattr_block *xb = 3817 (struct ocfs2_xattr_block *)xb_bh->b_data; 3818 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 3819 struct ocfs2_extent_list *el = &xb_root->xt_list; 3820 struct ocfs2_xattr_header *xh = 3821 (struct ocfs2_xattr_header *)header_bh->b_data; 3822 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3823 struct super_block *sb = inode->i_sb; 3824 struct ocfs2_super *osb = OCFS2_SB(sb); 3825 int ret, num_buckets, extend = 1; 3826 u64 p_blkno; 3827 u32 e_cpos, num_clusters; 3828 3829 mlog(0, "Add new xattr bucket starting form %llu\n", 3830 (unsigned long long)header_bh->b_blocknr); 3831 3832 /* 3833 * Add refrence for header_bh here because it may be 3834 * changed in ocfs2_add_new_xattr_cluster and we need 3835 * to free it in the end. 3836 */ 3837 get_bh(header_bh); 3838 3839 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos, 3840 &num_clusters, el); 3841 if (ret) { 3842 mlog_errno(ret); 3843 goto out; 3844 } 3845 3846 ret = ocfs2_read_block(osb, p_blkno, 3847 &first_bh, OCFS2_BH_CACHED, inode); 3848 if (ret) { 3849 mlog_errno(ret); 3850 goto out; 3851 } 3852 3853 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters; 3854 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3855 3856 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) { 3857 ret = ocfs2_add_new_xattr_cluster(inode, 3858 xb_bh, 3859 &first_bh, 3860 &header_bh, 3861 &num_clusters, 3862 e_cpos, 3863 p_blkno, 3864 &extend); 3865 if (ret) { 3866 mlog_errno(ret); 3867 goto out; 3868 } 3869 } 3870 3871 if (extend) 3872 ret = ocfs2_extend_xattr_bucket(inode, 3873 first_bh, 3874 header_bh, 3875 num_clusters); 3876 if (ret) 3877 mlog_errno(ret); 3878 out: 3879 brelse(first_bh); 3880 brelse(header_bh); 3881 return ret; 3882 } 3883 3884 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode, 3885 struct ocfs2_xattr_bucket *bucket, 3886 int offs) 3887 { 3888 int block_off = offs >> inode->i_sb->s_blocksize_bits; 3889 3890 offs = offs % inode->i_sb->s_blocksize; 3891 return bucket->bhs[block_off]->b_data + offs; 3892 } 3893 3894 /* 3895 * Handle the normal xattr set, including replace, delete and new. 3896 * When the bucket is empty, "is_empty" is set and the caller can 3897 * free this bucket. 3898 * 3899 * Note: "local" indicates the real data's locality. So we can't 3900 * just its bucket locality by its length. 3901 */ 3902 static void ocfs2_xattr_set_entry_normal(struct inode *inode, 3903 struct ocfs2_xattr_info *xi, 3904 struct ocfs2_xattr_search *xs, 3905 u32 name_hash, 3906 int local, 3907 int *is_empty) 3908 { 3909 struct ocfs2_xattr_entry *last, *xe; 3910 int name_len = strlen(xi->name); 3911 struct ocfs2_xattr_header *xh = xs->header; 3912 u16 count = le16_to_cpu(xh->xh_count), start; 3913 size_t blocksize = inode->i_sb->s_blocksize; 3914 char *val; 3915 size_t offs, size, new_size; 3916 3917 last = &xh->xh_entries[count]; 3918 if (!xs->not_found) { 3919 xe = xs->here; 3920 offs = le16_to_cpu(xe->xe_name_offset); 3921 if (ocfs2_xattr_is_local(xe)) 3922 size = OCFS2_XATTR_SIZE(name_len) + 3923 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3924 else 3925 size = OCFS2_XATTR_SIZE(name_len) + 3926 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 3927 3928 /* 3929 * If the new value will be stored outside, xi->value has been 3930 * initalized as an empty ocfs2_xattr_value_root, and the same 3931 * goes with xi->value_len, so we can set new_size safely here. 3932 * See ocfs2_xattr_set_in_bucket. 3933 */ 3934 new_size = OCFS2_XATTR_SIZE(name_len) + 3935 OCFS2_XATTR_SIZE(xi->value_len); 3936 3937 le16_add_cpu(&xh->xh_name_value_len, -size); 3938 if (xi->value) { 3939 if (new_size > size) 3940 goto set_new_name_value; 3941 3942 /* Now replace the old value with new one. */ 3943 if (local) 3944 xe->xe_value_size = cpu_to_le64(xi->value_len); 3945 else 3946 xe->xe_value_size = 0; 3947 3948 val = ocfs2_xattr_bucket_get_val(inode, 3949 &xs->bucket, offs); 3950 memset(val + OCFS2_XATTR_SIZE(name_len), 0, 3951 size - OCFS2_XATTR_SIZE(name_len)); 3952 if (OCFS2_XATTR_SIZE(xi->value_len) > 0) 3953 memcpy(val + OCFS2_XATTR_SIZE(name_len), 3954 xi->value, xi->value_len); 3955 3956 le16_add_cpu(&xh->xh_name_value_len, new_size); 3957 ocfs2_xattr_set_local(xe, local); 3958 return; 3959 } else { 3960 /* Remove the old entry. */ 3961 last -= 1; 3962 memmove(xe, xe + 1, 3963 (void *)last - (void *)xe); 3964 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 3965 le16_add_cpu(&xh->xh_count, -1); 3966 if (xh->xh_count == 0 && is_empty) 3967 *is_empty = 1; 3968 return; 3969 } 3970 } else { 3971 /* find a new entry for insert. */ 3972 int low = 0, high = count - 1, tmp; 3973 struct ocfs2_xattr_entry *tmp_xe; 3974 3975 while (low <= high) { 3976 tmp = (low + high) / 2; 3977 tmp_xe = &xh->xh_entries[tmp]; 3978 3979 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash)) 3980 low = tmp + 1; 3981 else if (name_hash < 3982 le32_to_cpu(tmp_xe->xe_name_hash)) 3983 high = tmp - 1; 3984 else 3985 break; 3986 } 3987 3988 xe = &xh->xh_entries[low]; 3989 if (low != count) 3990 memmove(xe + 1, xe, (void *)last - (void *)xe); 3991 3992 le16_add_cpu(&xh->xh_count, 1); 3993 memset(xe, 0, sizeof(struct ocfs2_xattr_entry)); 3994 xe->xe_name_hash = cpu_to_le32(name_hash); 3995 xe->xe_name_len = name_len; 3996 ocfs2_xattr_set_type(xe, xi->name_index); 3997 } 3998 3999 set_new_name_value: 4000 /* Insert the new name+value. */ 4001 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len); 4002 4003 /* 4004 * We must make sure that the name/value pair 4005 * exists in the same block. 4006 */ 4007 offs = le16_to_cpu(xh->xh_free_start); 4008 start = offs - size; 4009 4010 if (start >> inode->i_sb->s_blocksize_bits != 4011 (offs - 1) >> inode->i_sb->s_blocksize_bits) { 4012 offs = offs - offs % blocksize; 4013 xh->xh_free_start = cpu_to_le16(offs); 4014 } 4015 4016 val = ocfs2_xattr_bucket_get_val(inode, 4017 &xs->bucket, offs - size); 4018 xe->xe_name_offset = cpu_to_le16(offs - size); 4019 4020 memset(val, 0, size); 4021 memcpy(val, xi->name, name_len); 4022 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); 4023 4024 xe->xe_value_size = cpu_to_le64(xi->value_len); 4025 ocfs2_xattr_set_local(xe, local); 4026 xs->here = xe; 4027 le16_add_cpu(&xh->xh_free_start, -size); 4028 le16_add_cpu(&xh->xh_name_value_len, size); 4029 4030 return; 4031 } 4032 4033 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode, 4034 handle_t *handle, 4035 struct ocfs2_xattr_search *xs, 4036 struct buffer_head **bhs, 4037 u16 bh_num) 4038 { 4039 int ret = 0, off, block_off; 4040 struct ocfs2_xattr_entry *xe = xs->here; 4041 4042 /* 4043 * First calculate all the blocks we should journal_access 4044 * and journal_dirty. The first block should always be touched. 4045 */ 4046 ret = ocfs2_journal_dirty(handle, bhs[0]); 4047 if (ret) 4048 mlog_errno(ret); 4049 4050 /* calc the data. */ 4051 off = le16_to_cpu(xe->xe_name_offset); 4052 block_off = off >> inode->i_sb->s_blocksize_bits; 4053 ret = ocfs2_journal_dirty(handle, bhs[block_off]); 4054 if (ret) 4055 mlog_errno(ret); 4056 4057 return ret; 4058 } 4059 4060 /* 4061 * Set the xattr entry in the specified bucket. 4062 * The bucket is indicated by xs->bucket and it should have the enough 4063 * space for the xattr insertion. 4064 */ 4065 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode, 4066 struct ocfs2_xattr_info *xi, 4067 struct ocfs2_xattr_search *xs, 4068 u32 name_hash, 4069 int local, 4070 int *bucket_empty) 4071 { 4072 int i, ret; 4073 handle_t *handle = NULL; 4074 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4075 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4076 4077 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n", 4078 (unsigned long)xi->value_len, xi->name_index, 4079 (unsigned long long)xs->bucket.bhs[0]->b_blocknr); 4080 4081 if (!xs->bucket.bhs[1]) { 4082 ret = ocfs2_read_blocks(osb, 4083 xs->bucket.bhs[0]->b_blocknr + 1, 4084 blk_per_bucket - 1, &xs->bucket.bhs[1], 4085 OCFS2_BH_CACHED, inode); 4086 if (ret) { 4087 mlog_errno(ret); 4088 goto out; 4089 } 4090 } 4091 4092 handle = ocfs2_start_trans(osb, blk_per_bucket); 4093 if (IS_ERR(handle)) { 4094 ret = PTR_ERR(handle); 4095 handle = NULL; 4096 mlog_errno(ret); 4097 goto out; 4098 } 4099 4100 for (i = 0; i < blk_per_bucket; i++) { 4101 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i], 4102 OCFS2_JOURNAL_ACCESS_WRITE); 4103 if (ret < 0) { 4104 mlog_errno(ret); 4105 goto out; 4106 } 4107 } 4108 4109 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, 4110 local, bucket_empty); 4111 4112 /*Only dirty the blocks we have touched in set xattr. */ 4113 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs, 4114 xs->bucket.bhs, blk_per_bucket); 4115 if (ret) 4116 mlog_errno(ret); 4117 out: 4118 ocfs2_commit_trans(osb, handle); 4119 4120 return ret; 4121 } 4122 4123 static int ocfs2_xattr_value_update_size(struct inode *inode, 4124 struct buffer_head *xe_bh, 4125 struct ocfs2_xattr_entry *xe, 4126 u64 new_size) 4127 { 4128 int ret; 4129 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4130 handle_t *handle = NULL; 4131 4132 handle = ocfs2_start_trans(osb, 1); 4133 if (handle == NULL) { 4134 ret = -ENOMEM; 4135 mlog_errno(ret); 4136 goto out; 4137 } 4138 4139 ret = ocfs2_journal_access(handle, inode, xe_bh, 4140 OCFS2_JOURNAL_ACCESS_WRITE); 4141 if (ret < 0) { 4142 mlog_errno(ret); 4143 goto out_commit; 4144 } 4145 4146 xe->xe_value_size = cpu_to_le64(new_size); 4147 4148 ret = ocfs2_journal_dirty(handle, xe_bh); 4149 if (ret < 0) 4150 mlog_errno(ret); 4151 4152 out_commit: 4153 ocfs2_commit_trans(osb, handle); 4154 out: 4155 return ret; 4156 } 4157 4158 /* 4159 * Truncate the specified xe_off entry in xattr bucket. 4160 * bucket is indicated by header_bh and len is the new length. 4161 * Both the ocfs2_xattr_value_root and the entry will be updated here. 4162 * 4163 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed. 4164 */ 4165 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode, 4166 struct buffer_head *header_bh, 4167 int xe_off, 4168 int len) 4169 { 4170 int ret, offset; 4171 u64 value_blk; 4172 struct buffer_head *value_bh = NULL; 4173 struct ocfs2_xattr_value_root *xv; 4174 struct ocfs2_xattr_entry *xe; 4175 struct ocfs2_xattr_header *xh = 4176 (struct ocfs2_xattr_header *)header_bh->b_data; 4177 size_t blocksize = inode->i_sb->s_blocksize; 4178 4179 xe = &xh->xh_entries[xe_off]; 4180 4181 BUG_ON(!xe || ocfs2_xattr_is_local(xe)); 4182 4183 offset = le16_to_cpu(xe->xe_name_offset) + 4184 OCFS2_XATTR_SIZE(xe->xe_name_len); 4185 4186 value_blk = offset / blocksize; 4187 4188 /* We don't allow ocfs2_xattr_value to be stored in different block. */ 4189 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize); 4190 value_blk += header_bh->b_blocknr; 4191 4192 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk, 4193 &value_bh, OCFS2_BH_CACHED, inode); 4194 if (ret) { 4195 mlog_errno(ret); 4196 goto out; 4197 } 4198 4199 xv = (struct ocfs2_xattr_value_root *) 4200 (value_bh->b_data + offset % blocksize); 4201 4202 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n", 4203 xe_off, (unsigned long long)header_bh->b_blocknr, len); 4204 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len); 4205 if (ret) { 4206 mlog_errno(ret); 4207 goto out; 4208 } 4209 4210 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len); 4211 if (ret) { 4212 mlog_errno(ret); 4213 goto out; 4214 } 4215 4216 out: 4217 brelse(value_bh); 4218 return ret; 4219 } 4220 4221 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode, 4222 struct ocfs2_xattr_search *xs, 4223 int len) 4224 { 4225 int ret, offset; 4226 struct ocfs2_xattr_entry *xe = xs->here; 4227 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base; 4228 4229 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe)); 4230 4231 offset = xe - xh->xh_entries; 4232 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0], 4233 offset, len); 4234 if (ret) 4235 mlog_errno(ret); 4236 4237 return ret; 4238 } 4239 4240 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode, 4241 struct ocfs2_xattr_search *xs, 4242 char *val, 4243 int value_len) 4244 { 4245 int offset; 4246 struct ocfs2_xattr_value_root *xv; 4247 struct ocfs2_xattr_entry *xe = xs->here; 4248 4249 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe)); 4250 4251 offset = le16_to_cpu(xe->xe_name_offset) + 4252 OCFS2_XATTR_SIZE(xe->xe_name_len); 4253 4254 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset); 4255 4256 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len); 4257 } 4258 4259 /* 4260 * Remove the xattr bucket pointed by bucket_bh. 4261 * All the buckets after it in the same xattr extent rec will be 4262 * move forward one by one. 4263 */ 4264 static int ocfs2_rm_xattr_bucket(struct inode *inode, 4265 struct buffer_head *first_bh, 4266 struct ocfs2_xattr_bucket *bucket) 4267 { 4268 int ret = 0, credits; 4269 struct ocfs2_xattr_header *xh = 4270 (struct ocfs2_xattr_header *)first_bh->b_data; 4271 u16 bucket_num = le16_to_cpu(xh->xh_num_buckets); 4272 u64 end, start = bucket->bhs[0]->b_blocknr; 4273 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4274 handle_t *handle; 4275 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4276 4277 end = first_bh->b_blocknr + (bucket_num - 1) * blk_per_bucket; 4278 4279 mlog(0, "rm xattr bucket %llu\n", start); 4280 /* 4281 * We need to update the first xattr_header and all the buckets starting 4282 * from start in this xattr rec. 4283 * 4284 * XXX: Should we empty the old last bucket here? 4285 */ 4286 credits = 1 + end - start; 4287 handle = ocfs2_start_trans(osb, credits); 4288 if (IS_ERR(handle)) { 4289 ret = PTR_ERR(handle); 4290 mlog_errno(ret); 4291 return ret; 4292 } 4293 4294 ret = ocfs2_journal_access(handle, inode, first_bh, 4295 OCFS2_JOURNAL_ACCESS_WRITE); 4296 if (ret) { 4297 mlog_errno(ret); 4298 goto out_commit; 4299 } 4300 4301 4302 while (start < end) { 4303 ret = ocfs2_cp_xattr_bucket(inode, handle, 4304 start + blk_per_bucket, 4305 start, 0); 4306 if (ret) { 4307 mlog_errno(ret); 4308 goto out_commit; 4309 } 4310 start += blk_per_bucket; 4311 } 4312 4313 /* update the first_bh. */ 4314 xh->xh_num_buckets = cpu_to_le16(bucket_num - 1); 4315 ocfs2_journal_dirty(handle, first_bh); 4316 4317 out_commit: 4318 ocfs2_commit_trans(osb, handle); 4319 return ret; 4320 } 4321 4322 static int ocfs2_rm_xattr_cluster(struct inode *inode, 4323 struct buffer_head *root_bh, 4324 u64 blkno, 4325 u32 cpos, 4326 u32 len) 4327 { 4328 int ret; 4329 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4330 struct inode *tl_inode = osb->osb_tl_inode; 4331 handle_t *handle; 4332 struct ocfs2_xattr_block *xb = 4333 (struct ocfs2_xattr_block *)root_bh->b_data; 4334 struct ocfs2_extent_list *root_el = &xb->xb_attrs.xb_root.xt_list; 4335 struct ocfs2_alloc_context *meta_ac = NULL; 4336 struct ocfs2_cached_dealloc_ctxt dealloc; 4337 4338 ocfs2_init_dealloc_ctxt(&dealloc); 4339 4340 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n", 4341 cpos, len, (unsigned long long)blkno); 4342 4343 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len); 4344 4345 ret = ocfs2_lock_allocators(inode, root_bh, root_el, 4346 0, 1, NULL, &meta_ac, 4347 OCFS2_XATTR_TREE_EXTENT, NULL); 4348 if (ret) { 4349 mlog_errno(ret); 4350 return ret; 4351 } 4352 4353 mutex_lock(&tl_inode->i_mutex); 4354 4355 if (ocfs2_truncate_log_needs_flush(osb)) { 4356 ret = __ocfs2_flush_truncate_log(osb); 4357 if (ret < 0) { 4358 mlog_errno(ret); 4359 goto out; 4360 } 4361 } 4362 4363 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 4364 if (handle == NULL) { 4365 ret = -ENOMEM; 4366 mlog_errno(ret); 4367 goto out; 4368 } 4369 4370 ret = ocfs2_journal_access(handle, inode, root_bh, 4371 OCFS2_JOURNAL_ACCESS_WRITE); 4372 if (ret) { 4373 mlog_errno(ret); 4374 goto out_commit; 4375 } 4376 4377 ret = ocfs2_remove_extent(inode, root_bh, cpos, len, handle, meta_ac, 4378 &dealloc, OCFS2_XATTR_TREE_EXTENT, NULL); 4379 if (ret) { 4380 mlog_errno(ret); 4381 goto out_commit; 4382 } 4383 4384 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len); 4385 4386 ret = ocfs2_journal_dirty(handle, root_bh); 4387 if (ret) { 4388 mlog_errno(ret); 4389 goto out_commit; 4390 } 4391 4392 ret = ocfs2_truncate_log_append(osb, handle, blkno, len); 4393 if (ret) 4394 mlog_errno(ret); 4395 4396 out_commit: 4397 ocfs2_commit_trans(osb, handle); 4398 out: 4399 ocfs2_schedule_truncate_log_flush(osb, 1); 4400 4401 mutex_unlock(&tl_inode->i_mutex); 4402 4403 if (meta_ac) 4404 ocfs2_free_alloc_context(meta_ac); 4405 4406 ocfs2_run_deallocs(osb, &dealloc); 4407 4408 return ret; 4409 } 4410 4411 /* 4412 * Free the xattr bucket indicated by xs->bucket and if all the buckets 4413 * in the clusters is free, free the clusters also. 4414 */ 4415 static int ocfs2_xattr_bucket_shrink(struct inode *inode, 4416 struct ocfs2_xattr_info *xi, 4417 struct ocfs2_xattr_search *xs, 4418 u32 name_hash) 4419 { 4420 int ret; 4421 u32 e_cpos, num_clusters; 4422 u64 p_blkno; 4423 struct buffer_head *first_bh = NULL; 4424 struct ocfs2_xattr_header *first_xh; 4425 struct ocfs2_xattr_block *xb = 4426 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 4427 4428 BUG_ON(xs->header->xh_count != 0); 4429 4430 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4431 &e_cpos, &num_clusters, 4432 &xb->xb_attrs.xb_root.xt_list); 4433 if (ret) { 4434 mlog_errno(ret); 4435 return ret; 4436 } 4437 4438 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, 4439 &first_bh, OCFS2_BH_CACHED, inode); 4440 if (ret) { 4441 mlog_errno(ret); 4442 return ret; 4443 } 4444 4445 ret = ocfs2_rm_xattr_bucket(inode, first_bh, &xs->bucket); 4446 if (ret) { 4447 mlog_errno(ret); 4448 goto out; 4449 } 4450 4451 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 4452 if (first_xh->xh_num_buckets == 0) 4453 ret = ocfs2_rm_xattr_cluster(inode, xs->xattr_bh, 4454 p_blkno, e_cpos, 4455 num_clusters); 4456 4457 out: 4458 brelse(first_bh); 4459 return ret; 4460 } 4461 4462 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode, 4463 struct ocfs2_xattr_search *xs) 4464 { 4465 handle_t *handle = NULL; 4466 struct ocfs2_xattr_header *xh = xs->bucket.xh; 4467 struct ocfs2_xattr_entry *last = &xh->xh_entries[ 4468 le16_to_cpu(xh->xh_count) - 1]; 4469 int ret = 0; 4470 4471 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1); 4472 if (IS_ERR(handle)) { 4473 ret = PTR_ERR(handle); 4474 mlog_errno(ret); 4475 return; 4476 } 4477 4478 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0], 4479 OCFS2_JOURNAL_ACCESS_WRITE); 4480 if (ret) { 4481 mlog_errno(ret); 4482 goto out_commit; 4483 } 4484 4485 /* Remove the old entry. */ 4486 memmove(xs->here, xs->here + 1, 4487 (void *)last - (void *)xs->here); 4488 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 4489 le16_add_cpu(&xh->xh_count, -1); 4490 4491 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]); 4492 if (ret < 0) 4493 mlog_errno(ret); 4494 out_commit: 4495 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 4496 } 4497 4498 /* 4499 * Set the xattr name/value in the bucket specified in xs. 4500 * 4501 * As the new value in xi may be stored in the bucket or in an outside cluster, 4502 * we divide the whole process into 3 steps: 4503 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket) 4504 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs) 4505 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside) 4506 * 4. If the clusters for the new outside value can't be allocated, we need 4507 * to free the xattr we allocated in set. 4508 */ 4509 static int ocfs2_xattr_set_in_bucket(struct inode *inode, 4510 struct ocfs2_xattr_info *xi, 4511 struct ocfs2_xattr_search *xs) 4512 { 4513 int ret, local = 1, bucket_empty = 0; 4514 size_t value_len; 4515 char *val = (char *)xi->value; 4516 struct ocfs2_xattr_entry *xe = xs->here; 4517 u32 name_hash = ocfs2_xattr_hash_by_name(inode, 4518 xi->name_index, xi->name); 4519 4520 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) { 4521 /* 4522 * We need to truncate the xattr storage first. 4523 * 4524 * If both the old and new value are stored to 4525 * outside block, we only need to truncate 4526 * the storage and then set the value outside. 4527 * 4528 * If the new value should be stored within block, 4529 * we should free all the outside block first and 4530 * the modification to the xattr block will be done 4531 * by following steps. 4532 */ 4533 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4534 value_len = xi->value_len; 4535 else 4536 value_len = 0; 4537 4538 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4539 value_len); 4540 if (ret) 4541 goto out; 4542 4543 if (value_len) 4544 goto set_value_outside; 4545 } 4546 4547 value_len = xi->value_len; 4548 /* So we have to handle the inside block change now. */ 4549 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4550 /* 4551 * If the new value will be stored outside of block, 4552 * initalize a new empty value root and insert it first. 4553 */ 4554 local = 0; 4555 xi->value = &def_xv; 4556 xi->value_len = OCFS2_XATTR_ROOT_SIZE; 4557 } 4558 4559 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, 4560 local, &bucket_empty); 4561 if (ret) { 4562 mlog_errno(ret); 4563 goto out; 4564 } 4565 4566 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4567 /* allocate the space now for the outside block storage. */ 4568 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4569 value_len); 4570 if (ret) { 4571 mlog_errno(ret); 4572 4573 if (xs->not_found) { 4574 /* 4575 * We can't allocate enough clusters for outside 4576 * storage and we have allocated xattr already, 4577 * so need to remove it. 4578 */ 4579 ocfs2_xattr_bucket_remove_xs(inode, xs); 4580 } 4581 goto out; 4582 } 4583 } else { 4584 if (bucket_empty) 4585 ret = ocfs2_xattr_bucket_shrink(inode, xi, 4586 xs, name_hash); 4587 goto out; 4588 } 4589 4590 set_value_outside: 4591 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len); 4592 out: 4593 return ret; 4594 } 4595 4596 /* check whether the xattr bucket is filled up with the same hash value. */ 4597 static int ocfs2_check_xattr_bucket_collision(struct inode *inode, 4598 struct ocfs2_xattr_bucket *bucket) 4599 { 4600 struct ocfs2_xattr_header *xh = bucket->xh; 4601 4602 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash == 4603 xh->xh_entries[0].xe_name_hash) { 4604 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, " 4605 "hash = %u\n", 4606 (unsigned long long)bucket->bhs[0]->b_blocknr, 4607 le32_to_cpu(xh->xh_entries[0].xe_name_hash)); 4608 return -ENOSPC; 4609 } 4610 4611 return 0; 4612 } 4613 4614 static int ocfs2_xattr_set_entry_index_block(struct inode *inode, 4615 struct ocfs2_xattr_info *xi, 4616 struct ocfs2_xattr_search *xs) 4617 { 4618 struct ocfs2_xattr_header *xh; 4619 struct ocfs2_xattr_entry *xe; 4620 u16 count, header_size, xh_free_start; 4621 int i, free, max_free, need, old; 4622 size_t value_size = 0, name_len = strlen(xi->name); 4623 size_t blocksize = inode->i_sb->s_blocksize; 4624 int ret, allocation = 0; 4625 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4626 4627 mlog_entry("Set xattr %s in xattr index block\n", xi->name); 4628 4629 try_again: 4630 xh = xs->header; 4631 count = le16_to_cpu(xh->xh_count); 4632 xh_free_start = le16_to_cpu(xh->xh_free_start); 4633 header_size = sizeof(struct ocfs2_xattr_header) + 4634 count * sizeof(struct ocfs2_xattr_entry); 4635 max_free = OCFS2_XATTR_BUCKET_SIZE - 4636 le16_to_cpu(xh->xh_name_value_len) - header_size; 4637 4638 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size " 4639 "of %u which exceed block size\n", 4640 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4641 header_size); 4642 4643 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4644 value_size = OCFS2_XATTR_ROOT_SIZE; 4645 else if (xi->value) 4646 value_size = OCFS2_XATTR_SIZE(xi->value_len); 4647 4648 if (xs->not_found) 4649 need = sizeof(struct ocfs2_xattr_entry) + 4650 OCFS2_XATTR_SIZE(name_len) + value_size; 4651 else { 4652 need = value_size + OCFS2_XATTR_SIZE(name_len); 4653 4654 /* 4655 * We only replace the old value if the new length is smaller 4656 * than the old one. Otherwise we will allocate new space in the 4657 * bucket to store it. 4658 */ 4659 xe = xs->here; 4660 if (ocfs2_xattr_is_local(xe)) 4661 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 4662 else 4663 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 4664 4665 if (old >= value_size) 4666 need = 0; 4667 } 4668 4669 free = xh_free_start - header_size; 4670 /* 4671 * We need to make sure the new name/value pair 4672 * can exist in the same block. 4673 */ 4674 if (xh_free_start % blocksize < need) 4675 free -= xh_free_start % blocksize; 4676 4677 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, " 4678 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len =" 4679 " %u\n", xs->not_found, 4680 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4681 free, need, max_free, le16_to_cpu(xh->xh_free_start), 4682 le16_to_cpu(xh->xh_name_value_len)); 4683 4684 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4685 if (need <= max_free && 4686 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4687 /* 4688 * We can create the space by defragment. Since only the 4689 * name/value will be moved, the xe shouldn't be changed 4690 * in xs. 4691 */ 4692 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket); 4693 if (ret) { 4694 mlog_errno(ret); 4695 goto out; 4696 } 4697 4698 xh_free_start = le16_to_cpu(xh->xh_free_start); 4699 free = xh_free_start - header_size; 4700 if (xh_free_start % blocksize < need) 4701 free -= xh_free_start % blocksize; 4702 4703 if (free >= need) 4704 goto xattr_set; 4705 4706 mlog(0, "Can't get enough space for xattr insert by " 4707 "defragment. Need %u bytes, but we have %d, so " 4708 "allocate new bucket for it.\n", need, free); 4709 } 4710 4711 /* 4712 * We have to add new buckets or clusters and one 4713 * allocation should leave us enough space for insert. 4714 */ 4715 BUG_ON(allocation); 4716 4717 /* 4718 * We do not allow for overlapping ranges between buckets. And 4719 * the maximum number of collisions we will allow for then is 4720 * one bucket's worth, so check it here whether we need to 4721 * add a new bucket for the insert. 4722 */ 4723 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket); 4724 if (ret) { 4725 mlog_errno(ret); 4726 goto out; 4727 } 4728 4729 ret = ocfs2_add_new_xattr_bucket(inode, 4730 xs->xattr_bh, 4731 xs->bucket.bhs[0]); 4732 if (ret) { 4733 mlog_errno(ret); 4734 goto out; 4735 } 4736 4737 for (i = 0; i < blk_per_bucket; i++) 4738 brelse(xs->bucket.bhs[i]); 4739 4740 memset(&xs->bucket, 0, sizeof(xs->bucket)); 4741 4742 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh, 4743 xi->name_index, 4744 xi->name, xs); 4745 if (ret && ret != -ENODATA) 4746 goto out; 4747 xs->not_found = ret; 4748 allocation = 1; 4749 goto try_again; 4750 } 4751 4752 xattr_set: 4753 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs); 4754 out: 4755 mlog_exit(ret); 4756 return ret; 4757 } 4758 4759 static int ocfs2_delete_xattr_in_bucket(struct inode *inode, 4760 struct ocfs2_xattr_bucket *bucket, 4761 void *para) 4762 { 4763 int ret = 0; 4764 struct ocfs2_xattr_header *xh = bucket->xh; 4765 u16 i; 4766 struct ocfs2_xattr_entry *xe; 4767 4768 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 4769 xe = &xh->xh_entries[i]; 4770 if (ocfs2_xattr_is_local(xe)) 4771 continue; 4772 4773 ret = ocfs2_xattr_bucket_value_truncate(inode, 4774 bucket->bhs[0], 4775 i, 0); 4776 if (ret) { 4777 mlog_errno(ret); 4778 break; 4779 } 4780 } 4781 4782 return ret; 4783 } 4784 4785 static int ocfs2_delete_xattr_index_block(struct inode *inode, 4786 struct buffer_head *xb_bh) 4787 { 4788 struct ocfs2_xattr_block *xb = 4789 (struct ocfs2_xattr_block *)xb_bh->b_data; 4790 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 4791 int ret = 0; 4792 u32 name_hash = UINT_MAX, e_cpos, num_clusters; 4793 u64 p_blkno; 4794 4795 if (le16_to_cpu(el->l_next_free_rec) == 0) 4796 return 0; 4797 4798 while (name_hash > 0) { 4799 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4800 &e_cpos, &num_clusters, el); 4801 if (ret) { 4802 mlog_errno(ret); 4803 goto out; 4804 } 4805 4806 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 4807 ocfs2_delete_xattr_in_bucket, 4808 NULL); 4809 if (ret) { 4810 mlog_errno(ret); 4811 goto out; 4812 } 4813 4814 ret = ocfs2_rm_xattr_cluster(inode, xb_bh, 4815 p_blkno, e_cpos, num_clusters); 4816 if (ret) { 4817 mlog_errno(ret); 4818 break; 4819 } 4820 4821 if (e_cpos == 0) 4822 break; 4823 4824 name_hash = e_cpos - 1; 4825 } 4826 4827 out: 4828 return ret; 4829 } 4830