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 (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 568 return ret; 569 570 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0); 571 if (ret < 0) { 572 mlog_errno(ret); 573 return ret; 574 } 575 576 di = (struct ocfs2_dinode *)di_bh->b_data; 577 578 down_read(&oi->ip_xattr_sem); 579 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size); 580 if (i_ret < 0) 581 b_ret = 0; 582 else { 583 if (buffer) { 584 buffer += i_ret; 585 size -= i_ret; 586 } 587 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di, 588 buffer, size); 589 if (b_ret < 0) 590 i_ret = 0; 591 } 592 up_read(&oi->ip_xattr_sem); 593 ocfs2_inode_unlock(dentry->d_inode, 0); 594 595 brelse(di_bh); 596 597 return i_ret + b_ret; 598 } 599 600 static int ocfs2_xattr_find_entry(int name_index, 601 const char *name, 602 struct ocfs2_xattr_search *xs) 603 { 604 struct ocfs2_xattr_entry *entry; 605 size_t name_len; 606 int i, cmp = 1; 607 608 if (name == NULL) 609 return -EINVAL; 610 611 name_len = strlen(name); 612 entry = xs->here; 613 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) { 614 cmp = name_index - ocfs2_xattr_get_type(entry); 615 if (!cmp) 616 cmp = name_len - entry->xe_name_len; 617 if (!cmp) 618 cmp = memcmp(name, (xs->base + 619 le16_to_cpu(entry->xe_name_offset)), 620 name_len); 621 if (cmp == 0) 622 break; 623 entry += 1; 624 } 625 xs->here = entry; 626 627 return cmp ? -ENODATA : 0; 628 } 629 630 static int ocfs2_xattr_get_value_outside(struct inode *inode, 631 struct ocfs2_xattr_value_root *xv, 632 void *buffer, 633 size_t len) 634 { 635 u32 cpos, p_cluster, num_clusters, bpc, clusters; 636 u64 blkno; 637 int i, ret = 0; 638 size_t cplen, blocksize; 639 struct buffer_head *bh = NULL; 640 struct ocfs2_extent_list *el; 641 642 el = &xv->xr_list; 643 clusters = le32_to_cpu(xv->xr_clusters); 644 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 645 blocksize = inode->i_sb->s_blocksize; 646 647 cpos = 0; 648 while (cpos < clusters) { 649 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, 650 &num_clusters, el); 651 if (ret) { 652 mlog_errno(ret); 653 goto out; 654 } 655 656 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); 657 /* Copy ocfs2_xattr_value */ 658 for (i = 0; i < num_clusters * bpc; i++, blkno++) { 659 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 660 &bh, OCFS2_BH_CACHED, inode); 661 if (ret) { 662 mlog_errno(ret); 663 goto out; 664 } 665 666 cplen = len >= blocksize ? blocksize : len; 667 memcpy(buffer, bh->b_data, cplen); 668 len -= cplen; 669 buffer += cplen; 670 671 brelse(bh); 672 bh = NULL; 673 if (len == 0) 674 break; 675 } 676 cpos += num_clusters; 677 } 678 out: 679 return ret; 680 } 681 682 static int ocfs2_xattr_ibody_get(struct inode *inode, 683 int name_index, 684 const char *name, 685 void *buffer, 686 size_t buffer_size, 687 struct ocfs2_xattr_search *xs) 688 { 689 struct ocfs2_inode_info *oi = OCFS2_I(inode); 690 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 691 struct ocfs2_xattr_value_root *xv; 692 size_t size; 693 int ret = 0; 694 695 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) 696 return -ENODATA; 697 698 xs->end = (void *)di + inode->i_sb->s_blocksize; 699 xs->header = (struct ocfs2_xattr_header *) 700 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 701 xs->base = (void *)xs->header; 702 xs->here = xs->header->xh_entries; 703 704 ret = ocfs2_xattr_find_entry(name_index, name, xs); 705 if (ret) 706 return ret; 707 size = le64_to_cpu(xs->here->xe_value_size); 708 if (buffer) { 709 if (size > buffer_size) 710 return -ERANGE; 711 if (ocfs2_xattr_is_local(xs->here)) { 712 memcpy(buffer, (void *)xs->base + 713 le16_to_cpu(xs->here->xe_name_offset) + 714 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size); 715 } else { 716 xv = (struct ocfs2_xattr_value_root *) 717 (xs->base + le16_to_cpu( 718 xs->here->xe_name_offset) + 719 OCFS2_XATTR_SIZE(xs->here->xe_name_len)); 720 ret = ocfs2_xattr_get_value_outside(inode, xv, 721 buffer, size); 722 if (ret < 0) { 723 mlog_errno(ret); 724 return ret; 725 } 726 } 727 } 728 729 return size; 730 } 731 732 static int ocfs2_xattr_block_get(struct inode *inode, 733 int name_index, 734 const char *name, 735 void *buffer, 736 size_t buffer_size, 737 struct ocfs2_xattr_search *xs) 738 { 739 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 740 struct buffer_head *blk_bh = NULL; 741 struct ocfs2_xattr_block *xb; 742 struct ocfs2_xattr_value_root *xv; 743 size_t size; 744 int ret = -ENODATA, name_offset, name_len, block_off, i; 745 746 if (!di->i_xattr_loc) 747 return ret; 748 749 memset(&xs->bucket, 0, sizeof(xs->bucket)); 750 751 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 752 le64_to_cpu(di->i_xattr_loc), 753 &blk_bh, OCFS2_BH_CACHED, inode); 754 if (ret < 0) { 755 mlog_errno(ret); 756 return ret; 757 } 758 /*Verify the signature of xattr block*/ 759 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 760 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 761 ret = -EFAULT; 762 goto cleanup; 763 } 764 765 xs->xattr_bh = blk_bh; 766 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 767 768 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 769 xs->header = &xb->xb_attrs.xb_header; 770 xs->base = (void *)xs->header; 771 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 772 xs->here = xs->header->xh_entries; 773 774 ret = ocfs2_xattr_find_entry(name_index, name, xs); 775 } else 776 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 777 name_index, 778 name, xs); 779 780 if (ret) 781 goto cleanup; 782 size = le64_to_cpu(xs->here->xe_value_size); 783 if (buffer) { 784 ret = -ERANGE; 785 if (size > buffer_size) 786 goto cleanup; 787 788 name_offset = le16_to_cpu(xs->here->xe_name_offset); 789 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len); 790 i = xs->here - xs->header->xh_entries; 791 792 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) { 793 ret = ocfs2_xattr_bucket_get_name_value(inode, 794 xs->bucket.xh, 795 i, 796 &block_off, 797 &name_offset); 798 xs->base = xs->bucket.bhs[block_off]->b_data; 799 } 800 if (ocfs2_xattr_is_local(xs->here)) { 801 memcpy(buffer, (void *)xs->base + 802 name_offset + name_len, size); 803 } else { 804 xv = (struct ocfs2_xattr_value_root *) 805 (xs->base + name_offset + name_len); 806 ret = ocfs2_xattr_get_value_outside(inode, xv, 807 buffer, size); 808 if (ret < 0) { 809 mlog_errno(ret); 810 goto cleanup; 811 } 812 } 813 } 814 ret = size; 815 cleanup: 816 for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++) 817 brelse(xs->bucket.bhs[i]); 818 memset(&xs->bucket, 0, sizeof(xs->bucket)); 819 820 brelse(blk_bh); 821 return ret; 822 } 823 824 /* ocfs2_xattr_get() 825 * 826 * Copy an extended attribute into the buffer provided. 827 * Buffer is NULL to compute the size of buffer required. 828 */ 829 int ocfs2_xattr_get(struct inode *inode, 830 int name_index, 831 const char *name, 832 void *buffer, 833 size_t buffer_size) 834 { 835 int ret; 836 struct ocfs2_dinode *di = NULL; 837 struct buffer_head *di_bh = NULL; 838 struct ocfs2_inode_info *oi = OCFS2_I(inode); 839 struct ocfs2_xattr_search xis = { 840 .not_found = -ENODATA, 841 }; 842 struct ocfs2_xattr_search xbs = { 843 .not_found = -ENODATA, 844 }; 845 846 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 847 ret = -ENODATA; 848 849 ret = ocfs2_inode_lock(inode, &di_bh, 0); 850 if (ret < 0) { 851 mlog_errno(ret); 852 return ret; 853 } 854 xis.inode_bh = xbs.inode_bh = di_bh; 855 di = (struct ocfs2_dinode *)di_bh->b_data; 856 857 down_read(&oi->ip_xattr_sem); 858 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer, 859 buffer_size, &xis); 860 if (ret == -ENODATA) 861 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer, 862 buffer_size, &xbs); 863 up_read(&oi->ip_xattr_sem); 864 ocfs2_inode_unlock(inode, 0); 865 866 brelse(di_bh); 867 868 return ret; 869 } 870 871 static int __ocfs2_xattr_set_value_outside(struct inode *inode, 872 struct ocfs2_xattr_value_root *xv, 873 const void *value, 874 int value_len) 875 { 876 int ret = 0, i, cp_len, credits; 877 u16 blocksize = inode->i_sb->s_blocksize; 878 u32 p_cluster, num_clusters; 879 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 880 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len); 881 u64 blkno; 882 struct buffer_head *bh = NULL; 883 handle_t *handle; 884 885 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters)); 886 887 credits = clusters * bpc; 888 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits); 889 if (IS_ERR(handle)) { 890 ret = PTR_ERR(handle); 891 mlog_errno(ret); 892 goto out; 893 } 894 895 while (cpos < clusters) { 896 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, 897 &num_clusters, &xv->xr_list); 898 if (ret) { 899 mlog_errno(ret); 900 goto out_commit; 901 } 902 903 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); 904 905 for (i = 0; i < num_clusters * bpc; i++, blkno++) { 906 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 907 &bh, OCFS2_BH_CACHED, inode); 908 if (ret) { 909 mlog_errno(ret); 910 goto out_commit; 911 } 912 913 ret = ocfs2_journal_access(handle, 914 inode, 915 bh, 916 OCFS2_JOURNAL_ACCESS_WRITE); 917 if (ret < 0) { 918 mlog_errno(ret); 919 goto out_commit; 920 } 921 922 cp_len = value_len > blocksize ? blocksize : value_len; 923 memcpy(bh->b_data, value, cp_len); 924 value_len -= cp_len; 925 value += cp_len; 926 if (cp_len < blocksize) 927 memset(bh->b_data + cp_len, 0, 928 blocksize - cp_len); 929 930 ret = ocfs2_journal_dirty(handle, bh); 931 if (ret < 0) { 932 mlog_errno(ret); 933 goto out_commit; 934 } 935 brelse(bh); 936 bh = NULL; 937 938 /* 939 * XXX: do we need to empty all the following 940 * blocks in this cluster? 941 */ 942 if (!value_len) 943 break; 944 } 945 cpos += num_clusters; 946 } 947 out_commit: 948 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 949 out: 950 brelse(bh); 951 952 return ret; 953 } 954 955 static int ocfs2_xattr_cleanup(struct inode *inode, 956 struct ocfs2_xattr_info *xi, 957 struct ocfs2_xattr_search *xs, 958 size_t offs) 959 { 960 handle_t *handle = NULL; 961 int ret = 0; 962 size_t name_len = strlen(xi->name); 963 void *val = xs->base + offs; 964 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 965 966 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 967 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 968 if (IS_ERR(handle)) { 969 ret = PTR_ERR(handle); 970 mlog_errno(ret); 971 goto out; 972 } 973 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 974 OCFS2_JOURNAL_ACCESS_WRITE); 975 if (ret) { 976 mlog_errno(ret); 977 goto out_commit; 978 } 979 /* Decrease xattr count */ 980 le16_add_cpu(&xs->header->xh_count, -1); 981 /* Remove the xattr entry and tree root which has already be set*/ 982 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry)); 983 memset(val, 0, size); 984 985 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 986 if (ret < 0) 987 mlog_errno(ret); 988 out_commit: 989 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 990 out: 991 return ret; 992 } 993 994 static int ocfs2_xattr_update_entry(struct inode *inode, 995 struct ocfs2_xattr_info *xi, 996 struct ocfs2_xattr_search *xs, 997 size_t offs) 998 { 999 handle_t *handle = NULL; 1000 int ret = 0; 1001 1002 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1003 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1004 if (IS_ERR(handle)) { 1005 ret = PTR_ERR(handle); 1006 mlog_errno(ret); 1007 goto out; 1008 } 1009 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1010 OCFS2_JOURNAL_ACCESS_WRITE); 1011 if (ret) { 1012 mlog_errno(ret); 1013 goto out_commit; 1014 } 1015 1016 xs->here->xe_name_offset = cpu_to_le16(offs); 1017 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1018 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE) 1019 ocfs2_xattr_set_local(xs->here, 1); 1020 else 1021 ocfs2_xattr_set_local(xs->here, 0); 1022 ocfs2_xattr_hash_entry(inode, xs->header, xs->here); 1023 1024 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1025 if (ret < 0) 1026 mlog_errno(ret); 1027 out_commit: 1028 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1029 out: 1030 return ret; 1031 } 1032 1033 /* 1034 * ocfs2_xattr_set_value_outside() 1035 * 1036 * Set large size value in B tree. 1037 */ 1038 static int ocfs2_xattr_set_value_outside(struct inode *inode, 1039 struct ocfs2_xattr_info *xi, 1040 struct ocfs2_xattr_search *xs, 1041 size_t offs) 1042 { 1043 size_t name_len = strlen(xi->name); 1044 void *val = xs->base + offs; 1045 struct ocfs2_xattr_value_root *xv = NULL; 1046 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 1047 int ret = 0; 1048 1049 memset(val, 0, size); 1050 memcpy(val, xi->name, name_len); 1051 xv = (struct ocfs2_xattr_value_root *) 1052 (val + OCFS2_XATTR_SIZE(name_len)); 1053 xv->xr_clusters = 0; 1054 xv->xr_last_eb_blk = 0; 1055 xv->xr_list.l_tree_depth = 0; 1056 xv->xr_list.l_count = cpu_to_le16(1); 1057 xv->xr_list.l_next_free_rec = 0; 1058 1059 ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv, 1060 xi->value_len); 1061 if (ret < 0) { 1062 mlog_errno(ret); 1063 return ret; 1064 } 1065 ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value, 1066 xi->value_len); 1067 if (ret < 0) { 1068 mlog_errno(ret); 1069 return ret; 1070 } 1071 ret = ocfs2_xattr_update_entry(inode, xi, xs, offs); 1072 if (ret < 0) 1073 mlog_errno(ret); 1074 1075 return ret; 1076 } 1077 1078 /* 1079 * ocfs2_xattr_set_entry_local() 1080 * 1081 * Set, replace or remove extended attribute in local. 1082 */ 1083 static void ocfs2_xattr_set_entry_local(struct inode *inode, 1084 struct ocfs2_xattr_info *xi, 1085 struct ocfs2_xattr_search *xs, 1086 struct ocfs2_xattr_entry *last, 1087 size_t min_offs) 1088 { 1089 size_t name_len = strlen(xi->name); 1090 int i; 1091 1092 if (xi->value && xs->not_found) { 1093 /* Insert the new xattr entry. */ 1094 le16_add_cpu(&xs->header->xh_count, 1); 1095 ocfs2_xattr_set_type(last, xi->name_index); 1096 ocfs2_xattr_set_local(last, 1); 1097 last->xe_name_len = name_len; 1098 } else { 1099 void *first_val; 1100 void *val; 1101 size_t offs, size; 1102 1103 first_val = xs->base + min_offs; 1104 offs = le16_to_cpu(xs->here->xe_name_offset); 1105 val = xs->base + offs; 1106 1107 if (le64_to_cpu(xs->here->xe_value_size) > 1108 OCFS2_XATTR_INLINE_SIZE) 1109 size = OCFS2_XATTR_SIZE(name_len) + 1110 OCFS2_XATTR_ROOT_SIZE; 1111 else 1112 size = OCFS2_XATTR_SIZE(name_len) + 1113 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1114 1115 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) + 1116 OCFS2_XATTR_SIZE(xi->value_len)) { 1117 /* The old and the new value have the 1118 same size. Just replace the value. */ 1119 ocfs2_xattr_set_local(xs->here, 1); 1120 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1121 /* Clear value bytes. */ 1122 memset(val + OCFS2_XATTR_SIZE(name_len), 1123 0, 1124 OCFS2_XATTR_SIZE(xi->value_len)); 1125 memcpy(val + OCFS2_XATTR_SIZE(name_len), 1126 xi->value, 1127 xi->value_len); 1128 return; 1129 } 1130 /* Remove the old name+value. */ 1131 memmove(first_val + size, first_val, val - first_val); 1132 memset(first_val, 0, size); 1133 xs->here->xe_name_hash = 0; 1134 xs->here->xe_name_offset = 0; 1135 ocfs2_xattr_set_local(xs->here, 1); 1136 xs->here->xe_value_size = 0; 1137 1138 min_offs += size; 1139 1140 /* Adjust all value offsets. */ 1141 last = xs->header->xh_entries; 1142 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { 1143 size_t o = le16_to_cpu(last->xe_name_offset); 1144 1145 if (o < offs) 1146 last->xe_name_offset = cpu_to_le16(o + size); 1147 last += 1; 1148 } 1149 1150 if (!xi->value) { 1151 /* Remove the old entry. */ 1152 last -= 1; 1153 memmove(xs->here, xs->here + 1, 1154 (void *)last - (void *)xs->here); 1155 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 1156 le16_add_cpu(&xs->header->xh_count, -1); 1157 } 1158 } 1159 if (xi->value) { 1160 /* Insert the new name+value. */ 1161 size_t size = OCFS2_XATTR_SIZE(name_len) + 1162 OCFS2_XATTR_SIZE(xi->value_len); 1163 void *val = xs->base + min_offs - size; 1164 1165 xs->here->xe_name_offset = cpu_to_le16(min_offs - size); 1166 memset(val, 0, size); 1167 memcpy(val, xi->name, name_len); 1168 memcpy(val + OCFS2_XATTR_SIZE(name_len), 1169 xi->value, 1170 xi->value_len); 1171 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1172 ocfs2_xattr_set_local(xs->here, 1); 1173 ocfs2_xattr_hash_entry(inode, xs->header, xs->here); 1174 } 1175 1176 return; 1177 } 1178 1179 /* 1180 * ocfs2_xattr_set_entry() 1181 * 1182 * Set extended attribute entry into inode or block. 1183 * 1184 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE, 1185 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(), 1186 * then set value in B tree with set_value_outside(). 1187 */ 1188 static int ocfs2_xattr_set_entry(struct inode *inode, 1189 struct ocfs2_xattr_info *xi, 1190 struct ocfs2_xattr_search *xs, 1191 int flag) 1192 { 1193 struct ocfs2_xattr_entry *last; 1194 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1195 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1196 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name); 1197 size_t size_l = 0; 1198 handle_t *handle = NULL; 1199 int free, i, ret; 1200 struct ocfs2_xattr_info xi_l = { 1201 .name_index = xi->name_index, 1202 .name = xi->name, 1203 .value = xi->value, 1204 .value_len = xi->value_len, 1205 }; 1206 1207 /* Compute min_offs, last and free space. */ 1208 last = xs->header->xh_entries; 1209 1210 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { 1211 size_t offs = le16_to_cpu(last->xe_name_offset); 1212 if (offs < min_offs) 1213 min_offs = offs; 1214 last += 1; 1215 } 1216 1217 free = min_offs - ((void *)last - xs->base) - sizeof(__u32); 1218 if (free < 0) 1219 return -EFAULT; 1220 1221 if (!xs->not_found) { 1222 size_t size = 0; 1223 if (ocfs2_xattr_is_local(xs->here)) 1224 size = OCFS2_XATTR_SIZE(name_len) + 1225 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1226 else 1227 size = OCFS2_XATTR_SIZE(name_len) + 1228 OCFS2_XATTR_ROOT_SIZE; 1229 free += (size + sizeof(struct ocfs2_xattr_entry)); 1230 } 1231 /* Check free space in inode or block */ 1232 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1233 if (free < sizeof(struct ocfs2_xattr_entry) + 1234 OCFS2_XATTR_SIZE(name_len) + 1235 OCFS2_XATTR_ROOT_SIZE) { 1236 ret = -ENOSPC; 1237 goto out; 1238 } 1239 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 1240 xi_l.value = (void *)&def_xv; 1241 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE; 1242 } else if (xi->value) { 1243 if (free < sizeof(struct ocfs2_xattr_entry) + 1244 OCFS2_XATTR_SIZE(name_len) + 1245 OCFS2_XATTR_SIZE(xi->value_len)) { 1246 ret = -ENOSPC; 1247 goto out; 1248 } 1249 } 1250 1251 if (!xs->not_found) { 1252 /* For existing extended attribute */ 1253 size_t size = OCFS2_XATTR_SIZE(name_len) + 1254 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1255 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1256 void *val = xs->base + offs; 1257 1258 if (ocfs2_xattr_is_local(xs->here) && size == size_l) { 1259 /* Replace existing local xattr with tree root */ 1260 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, 1261 offs); 1262 if (ret < 0) 1263 mlog_errno(ret); 1264 goto out; 1265 } else if (!ocfs2_xattr_is_local(xs->here)) { 1266 /* For existing xattr which has value outside */ 1267 struct ocfs2_xattr_value_root *xv = NULL; 1268 xv = (struct ocfs2_xattr_value_root *)(val + 1269 OCFS2_XATTR_SIZE(name_len)); 1270 1271 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1272 /* 1273 * If new value need set outside also, 1274 * first truncate old value to new value, 1275 * then set new value with set_value_outside(). 1276 */ 1277 ret = ocfs2_xattr_value_truncate(inode, 1278 xs->xattr_bh, 1279 xv, 1280 xi->value_len); 1281 if (ret < 0) { 1282 mlog_errno(ret); 1283 goto out; 1284 } 1285 1286 ret = __ocfs2_xattr_set_value_outside(inode, 1287 xv, 1288 xi->value, 1289 xi->value_len); 1290 if (ret < 0) { 1291 mlog_errno(ret); 1292 goto out; 1293 } 1294 1295 ret = ocfs2_xattr_update_entry(inode, 1296 xi, 1297 xs, 1298 offs); 1299 if (ret < 0) 1300 mlog_errno(ret); 1301 goto out; 1302 } else { 1303 /* 1304 * If new value need set in local, 1305 * just trucate old value to zero. 1306 */ 1307 ret = ocfs2_xattr_value_truncate(inode, 1308 xs->xattr_bh, 1309 xv, 1310 0); 1311 if (ret < 0) 1312 mlog_errno(ret); 1313 } 1314 } 1315 } 1316 1317 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1318 OCFS2_INODE_UPDATE_CREDITS); 1319 if (IS_ERR(handle)) { 1320 ret = PTR_ERR(handle); 1321 mlog_errno(ret); 1322 goto out; 1323 } 1324 1325 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1326 OCFS2_JOURNAL_ACCESS_WRITE); 1327 if (ret) { 1328 mlog_errno(ret); 1329 goto out_commit; 1330 } 1331 1332 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1333 /*set extended attribue in external blcok*/ 1334 ret = ocfs2_extend_trans(handle, 1335 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1336 if (ret) { 1337 mlog_errno(ret); 1338 goto out_commit; 1339 } 1340 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1341 OCFS2_JOURNAL_ACCESS_WRITE); 1342 if (ret) { 1343 mlog_errno(ret); 1344 goto out_commit; 1345 } 1346 } 1347 1348 /* 1349 * Set value in local, include set tree root in local. 1350 * This is the first step for value size >INLINE_SIZE. 1351 */ 1352 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs); 1353 1354 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1355 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1356 if (ret < 0) { 1357 mlog_errno(ret); 1358 goto out_commit; 1359 } 1360 } 1361 1362 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) && 1363 (flag & OCFS2_INLINE_XATTR_FL)) { 1364 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1365 unsigned int xattrsize = osb->s_xattr_inline_size; 1366 1367 /* 1368 * Adjust extent record count or inline data size 1369 * to reserve space for extended attribute. 1370 */ 1371 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1372 struct ocfs2_inline_data *idata = &di->id2.i_data; 1373 le16_add_cpu(&idata->id_count, -xattrsize); 1374 } else if (!(ocfs2_inode_is_fast_symlink(inode))) { 1375 struct ocfs2_extent_list *el = &di->id2.i_list; 1376 le16_add_cpu(&el->l_count, -(xattrsize / 1377 sizeof(struct ocfs2_extent_rec))); 1378 } 1379 di->i_xattr_inline_size = cpu_to_le16(xattrsize); 1380 } 1381 /* Update xattr flag */ 1382 spin_lock(&oi->ip_lock); 1383 oi->ip_dyn_features |= flag; 1384 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1385 spin_unlock(&oi->ip_lock); 1386 /* Update inode ctime */ 1387 inode->i_ctime = CURRENT_TIME; 1388 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); 1389 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 1390 1391 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1392 if (ret < 0) 1393 mlog_errno(ret); 1394 1395 out_commit: 1396 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1397 1398 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1399 /* 1400 * Set value outside in B tree. 1401 * This is the second step for value size > INLINE_SIZE. 1402 */ 1403 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1404 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs); 1405 if (ret < 0) { 1406 int ret2; 1407 1408 mlog_errno(ret); 1409 /* 1410 * If set value outside failed, we have to clean 1411 * the junk tree root we have already set in local. 1412 */ 1413 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs); 1414 if (ret2 < 0) 1415 mlog_errno(ret2); 1416 } 1417 } 1418 out: 1419 return ret; 1420 1421 } 1422 1423 static int ocfs2_xattr_free_block(handle_t *handle, 1424 struct ocfs2_super *osb, 1425 struct ocfs2_xattr_block *xb) 1426 { 1427 struct inode *xb_alloc_inode; 1428 struct buffer_head *xb_alloc_bh = NULL; 1429 u64 blk = le64_to_cpu(xb->xb_blkno); 1430 u16 bit = le16_to_cpu(xb->xb_suballoc_bit); 1431 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit); 1432 int ret = 0; 1433 1434 xb_alloc_inode = ocfs2_get_system_file_inode(osb, 1435 EXTENT_ALLOC_SYSTEM_INODE, 1436 le16_to_cpu(xb->xb_suballoc_slot)); 1437 if (!xb_alloc_inode) { 1438 ret = -ENOMEM; 1439 mlog_errno(ret); 1440 goto out; 1441 } 1442 mutex_lock(&xb_alloc_inode->i_mutex); 1443 1444 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1); 1445 if (ret < 0) { 1446 mlog_errno(ret); 1447 goto out_mutex; 1448 } 1449 ret = ocfs2_extend_trans(handle, OCFS2_SUBALLOC_FREE); 1450 if (ret < 0) { 1451 mlog_errno(ret); 1452 goto out_unlock; 1453 } 1454 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh, 1455 bit, bg_blkno, 1); 1456 if (ret < 0) 1457 mlog_errno(ret); 1458 out_unlock: 1459 ocfs2_inode_unlock(xb_alloc_inode, 1); 1460 brelse(xb_alloc_bh); 1461 out_mutex: 1462 mutex_unlock(&xb_alloc_inode->i_mutex); 1463 iput(xb_alloc_inode); 1464 out: 1465 return ret; 1466 } 1467 1468 static int ocfs2_remove_value_outside(struct inode*inode, 1469 struct buffer_head *bh, 1470 struct ocfs2_xattr_header *header) 1471 { 1472 int ret = 0, i; 1473 1474 for (i = 0; i < le16_to_cpu(header->xh_count); i++) { 1475 struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; 1476 1477 if (!ocfs2_xattr_is_local(entry)) { 1478 struct ocfs2_xattr_value_root *xv; 1479 void *val; 1480 1481 val = (void *)header + 1482 le16_to_cpu(entry->xe_name_offset); 1483 xv = (struct ocfs2_xattr_value_root *) 1484 (val + OCFS2_XATTR_SIZE(entry->xe_name_len)); 1485 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0); 1486 if (ret < 0) { 1487 mlog_errno(ret); 1488 return ret; 1489 } 1490 } 1491 } 1492 1493 return ret; 1494 } 1495 1496 static int ocfs2_xattr_ibody_remove(struct inode *inode, 1497 struct buffer_head *di_bh) 1498 { 1499 1500 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1501 struct ocfs2_xattr_header *header; 1502 int ret; 1503 1504 header = (struct ocfs2_xattr_header *) 1505 ((void *)di + inode->i_sb->s_blocksize - 1506 le16_to_cpu(di->i_xattr_inline_size)); 1507 1508 ret = ocfs2_remove_value_outside(inode, di_bh, header); 1509 1510 return ret; 1511 } 1512 1513 static int ocfs2_xattr_block_remove(struct inode *inode, 1514 struct buffer_head *blk_bh) 1515 { 1516 struct ocfs2_xattr_block *xb; 1517 int ret = 0; 1518 1519 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1520 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1521 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header); 1522 ret = ocfs2_remove_value_outside(inode, blk_bh, header); 1523 } else 1524 ret = ocfs2_delete_xattr_index_block(inode, blk_bh); 1525 1526 return ret; 1527 } 1528 1529 /* 1530 * ocfs2_xattr_remove() 1531 * 1532 * Free extended attribute resources associated with this inode. 1533 */ 1534 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh) 1535 { 1536 struct ocfs2_xattr_block *xb; 1537 struct buffer_head *blk_bh = NULL; 1538 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1539 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1540 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1541 handle_t *handle; 1542 int ret; 1543 1544 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 1545 return 0; 1546 1547 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1548 ret = ocfs2_xattr_ibody_remove(inode, di_bh); 1549 if (ret < 0) { 1550 mlog_errno(ret); 1551 goto out; 1552 } 1553 } 1554 if (di->i_xattr_loc) { 1555 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1556 le64_to_cpu(di->i_xattr_loc), 1557 &blk_bh, OCFS2_BH_CACHED, inode); 1558 if (ret < 0) { 1559 mlog_errno(ret); 1560 return ret; 1561 } 1562 /*Verify the signature of xattr block*/ 1563 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 1564 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 1565 ret = -EFAULT; 1566 goto out; 1567 } 1568 1569 ret = ocfs2_xattr_block_remove(inode, blk_bh); 1570 if (ret < 0) { 1571 mlog_errno(ret); 1572 goto out; 1573 } 1574 } 1575 1576 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1577 OCFS2_INODE_UPDATE_CREDITS); 1578 if (IS_ERR(handle)) { 1579 ret = PTR_ERR(handle); 1580 mlog_errno(ret); 1581 goto out; 1582 } 1583 ret = ocfs2_journal_access(handle, inode, di_bh, 1584 OCFS2_JOURNAL_ACCESS_WRITE); 1585 if (ret) { 1586 mlog_errno(ret); 1587 goto out_commit; 1588 } 1589 1590 if (di->i_xattr_loc) { 1591 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1592 ocfs2_xattr_free_block(handle, osb, xb); 1593 di->i_xattr_loc = cpu_to_le64(0); 1594 } 1595 1596 spin_lock(&oi->ip_lock); 1597 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL); 1598 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1599 spin_unlock(&oi->ip_lock); 1600 1601 ret = ocfs2_journal_dirty(handle, di_bh); 1602 if (ret < 0) 1603 mlog_errno(ret); 1604 out_commit: 1605 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1606 out: 1607 brelse(blk_bh); 1608 1609 return ret; 1610 } 1611 1612 static int ocfs2_xattr_has_space_inline(struct inode *inode, 1613 struct ocfs2_dinode *di) 1614 { 1615 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1616 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size; 1617 int free; 1618 1619 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE) 1620 return 0; 1621 1622 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1623 struct ocfs2_inline_data *idata = &di->id2.i_data; 1624 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size); 1625 } else if (ocfs2_inode_is_fast_symlink(inode)) { 1626 free = ocfs2_fast_symlink_chars(inode->i_sb) - 1627 le64_to_cpu(di->i_size); 1628 } else { 1629 struct ocfs2_extent_list *el = &di->id2.i_list; 1630 free = (le16_to_cpu(el->l_count) - 1631 le16_to_cpu(el->l_next_free_rec)) * 1632 sizeof(struct ocfs2_extent_rec); 1633 } 1634 if (free >= xattrsize) 1635 return 1; 1636 1637 return 0; 1638 } 1639 1640 /* 1641 * ocfs2_xattr_ibody_find() 1642 * 1643 * Find extended attribute in inode block and 1644 * fill search info into struct ocfs2_xattr_search. 1645 */ 1646 static int ocfs2_xattr_ibody_find(struct inode *inode, 1647 int name_index, 1648 const char *name, 1649 struct ocfs2_xattr_search *xs) 1650 { 1651 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1652 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1653 int ret; 1654 int has_space = 0; 1655 1656 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1657 return 0; 1658 1659 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1660 down_read(&oi->ip_alloc_sem); 1661 has_space = ocfs2_xattr_has_space_inline(inode, di); 1662 up_read(&oi->ip_alloc_sem); 1663 if (!has_space) 1664 return 0; 1665 } 1666 1667 xs->xattr_bh = xs->inode_bh; 1668 xs->end = (void *)di + inode->i_sb->s_blocksize; 1669 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) 1670 xs->header = (struct ocfs2_xattr_header *) 1671 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 1672 else 1673 xs->header = (struct ocfs2_xattr_header *) 1674 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size); 1675 xs->base = (void *)xs->header; 1676 xs->here = xs->header->xh_entries; 1677 1678 /* Find the named attribute. */ 1679 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1680 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1681 if (ret && ret != -ENODATA) 1682 return ret; 1683 xs->not_found = ret; 1684 } 1685 1686 return 0; 1687 } 1688 1689 /* 1690 * ocfs2_xattr_ibody_set() 1691 * 1692 * Set, replace or remove an extended attribute into inode block. 1693 * 1694 */ 1695 static int ocfs2_xattr_ibody_set(struct inode *inode, 1696 struct ocfs2_xattr_info *xi, 1697 struct ocfs2_xattr_search *xs) 1698 { 1699 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1700 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1701 int ret; 1702 1703 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1704 return -ENOSPC; 1705 1706 down_write(&oi->ip_alloc_sem); 1707 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1708 if (!ocfs2_xattr_has_space_inline(inode, di)) { 1709 ret = -ENOSPC; 1710 goto out; 1711 } 1712 } 1713 1714 ret = ocfs2_xattr_set_entry(inode, xi, xs, 1715 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL)); 1716 out: 1717 up_write(&oi->ip_alloc_sem); 1718 1719 return ret; 1720 } 1721 1722 /* 1723 * ocfs2_xattr_block_find() 1724 * 1725 * Find extended attribute in external block and 1726 * fill search info into struct ocfs2_xattr_search. 1727 */ 1728 static int ocfs2_xattr_block_find(struct inode *inode, 1729 int name_index, 1730 const char *name, 1731 struct ocfs2_xattr_search *xs) 1732 { 1733 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1734 struct buffer_head *blk_bh = NULL; 1735 struct ocfs2_xattr_block *xb; 1736 int ret = 0; 1737 1738 if (!di->i_xattr_loc) 1739 return ret; 1740 1741 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1742 le64_to_cpu(di->i_xattr_loc), 1743 &blk_bh, OCFS2_BH_CACHED, inode); 1744 if (ret < 0) { 1745 mlog_errno(ret); 1746 return ret; 1747 } 1748 /*Verify the signature of xattr block*/ 1749 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 1750 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 1751 ret = -EFAULT; 1752 goto cleanup; 1753 } 1754 1755 xs->xattr_bh = blk_bh; 1756 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1757 1758 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1759 xs->header = &xb->xb_attrs.xb_header; 1760 xs->base = (void *)xs->header; 1761 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 1762 xs->here = xs->header->xh_entries; 1763 1764 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1765 } else 1766 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 1767 name_index, 1768 name, xs); 1769 1770 if (ret && ret != -ENODATA) { 1771 xs->xattr_bh = NULL; 1772 goto cleanup; 1773 } 1774 xs->not_found = ret; 1775 return 0; 1776 cleanup: 1777 brelse(blk_bh); 1778 1779 return ret; 1780 } 1781 1782 /* 1783 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree 1784 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header 1785 * re-initialized. 1786 */ 1787 static int ocfs2_restore_xattr_block(struct inode *inode, 1788 struct ocfs2_xattr_search *xs) 1789 { 1790 int ret; 1791 handle_t *handle; 1792 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1793 struct ocfs2_xattr_block *xb = 1794 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1795 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 1796 u16 xb_flags = le16_to_cpu(xb->xb_flags); 1797 1798 BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) || 1799 le16_to_cpu(el->l_next_free_rec) != 0); 1800 1801 handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1802 if (IS_ERR(handle)) { 1803 ret = PTR_ERR(handle); 1804 handle = NULL; 1805 goto out; 1806 } 1807 1808 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1809 OCFS2_JOURNAL_ACCESS_WRITE); 1810 if (ret < 0) { 1811 mlog_errno(ret); 1812 goto out_commit; 1813 } 1814 1815 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 1816 offsetof(struct ocfs2_xattr_block, xb_attrs)); 1817 1818 xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED); 1819 1820 ocfs2_journal_dirty(handle, xs->xattr_bh); 1821 1822 out_commit: 1823 ocfs2_commit_trans(osb, handle); 1824 out: 1825 return ret; 1826 } 1827 1828 /* 1829 * ocfs2_xattr_block_set() 1830 * 1831 * Set, replace or remove an extended attribute into external block. 1832 * 1833 */ 1834 static int ocfs2_xattr_block_set(struct inode *inode, 1835 struct ocfs2_xattr_info *xi, 1836 struct ocfs2_xattr_search *xs) 1837 { 1838 struct buffer_head *new_bh = NULL; 1839 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1840 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1841 struct ocfs2_alloc_context *meta_ac = NULL; 1842 handle_t *handle = NULL; 1843 struct ocfs2_xattr_block *xblk = NULL; 1844 u16 suballoc_bit_start; 1845 u32 num_got; 1846 u64 first_blkno; 1847 int ret; 1848 1849 if (!xs->xattr_bh) { 1850 /* 1851 * Alloc one external block for extended attribute 1852 * outside of inode. 1853 */ 1854 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); 1855 if (ret < 0) { 1856 mlog_errno(ret); 1857 goto out; 1858 } 1859 handle = ocfs2_start_trans(osb, 1860 OCFS2_XATTR_BLOCK_CREATE_CREDITS); 1861 if (IS_ERR(handle)) { 1862 ret = PTR_ERR(handle); 1863 mlog_errno(ret); 1864 goto out; 1865 } 1866 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1867 OCFS2_JOURNAL_ACCESS_CREATE); 1868 if (ret < 0) { 1869 mlog_errno(ret); 1870 goto out_commit; 1871 } 1872 1873 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, 1874 &suballoc_bit_start, &num_got, 1875 &first_blkno); 1876 if (ret < 0) { 1877 mlog_errno(ret); 1878 goto out_commit; 1879 } 1880 1881 new_bh = sb_getblk(inode->i_sb, first_blkno); 1882 ocfs2_set_new_buffer_uptodate(inode, new_bh); 1883 1884 ret = ocfs2_journal_access(handle, inode, new_bh, 1885 OCFS2_JOURNAL_ACCESS_CREATE); 1886 if (ret < 0) { 1887 mlog_errno(ret); 1888 goto out_commit; 1889 } 1890 1891 /* Initialize ocfs2_xattr_block */ 1892 xs->xattr_bh = new_bh; 1893 xblk = (struct ocfs2_xattr_block *)new_bh->b_data; 1894 memset(xblk, 0, inode->i_sb->s_blocksize); 1895 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE); 1896 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num); 1897 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start); 1898 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation); 1899 xblk->xb_blkno = cpu_to_le64(first_blkno); 1900 1901 xs->header = &xblk->xb_attrs.xb_header; 1902 xs->base = (void *)xs->header; 1903 xs->end = (void *)xblk + inode->i_sb->s_blocksize; 1904 xs->here = xs->header->xh_entries; 1905 1906 1907 ret = ocfs2_journal_dirty(handle, new_bh); 1908 if (ret < 0) { 1909 mlog_errno(ret); 1910 goto out_commit; 1911 } 1912 di->i_xattr_loc = cpu_to_le64(first_blkno); 1913 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1914 if (ret < 0) 1915 mlog_errno(ret); 1916 out_commit: 1917 ocfs2_commit_trans(osb, handle); 1918 out: 1919 if (meta_ac) 1920 ocfs2_free_alloc_context(meta_ac); 1921 if (ret < 0) 1922 return ret; 1923 } else 1924 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1925 1926 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) { 1927 /* Set extended attribute into external block */ 1928 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL); 1929 if (!ret || ret != -ENOSPC) 1930 goto end; 1931 1932 ret = ocfs2_xattr_create_index_block(inode, xs); 1933 if (ret) 1934 goto end; 1935 } 1936 1937 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs); 1938 if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0) 1939 ret = ocfs2_restore_xattr_block(inode, xs); 1940 1941 end: 1942 1943 return ret; 1944 } 1945 1946 /* 1947 * ocfs2_xattr_set() 1948 * 1949 * Set, replace or remove an extended attribute for this inode. 1950 * value is NULL to remove an existing extended attribute, else either 1951 * create or replace an extended attribute. 1952 */ 1953 int ocfs2_xattr_set(struct inode *inode, 1954 int name_index, 1955 const char *name, 1956 const void *value, 1957 size_t value_len, 1958 int flags) 1959 { 1960 struct buffer_head *di_bh = NULL; 1961 struct ocfs2_dinode *di; 1962 int ret; 1963 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 1964 1965 struct ocfs2_xattr_info xi = { 1966 .name_index = name_index, 1967 .name = name, 1968 .value = value, 1969 .value_len = value_len, 1970 }; 1971 1972 struct ocfs2_xattr_search xis = { 1973 .not_found = -ENODATA, 1974 }; 1975 1976 struct ocfs2_xattr_search xbs = { 1977 .not_found = -ENODATA, 1978 }; 1979 1980 ret = ocfs2_inode_lock(inode, &di_bh, 1); 1981 if (ret < 0) { 1982 mlog_errno(ret); 1983 return ret; 1984 } 1985 xis.inode_bh = xbs.inode_bh = di_bh; 1986 di = (struct ocfs2_dinode *)di_bh->b_data; 1987 1988 down_write(&OCFS2_I(inode)->ip_xattr_sem); 1989 /* 1990 * Scan inode and external block to find the same name 1991 * extended attribute and collect search infomation. 1992 */ 1993 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis); 1994 if (ret) 1995 goto cleanup; 1996 if (xis.not_found) { 1997 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs); 1998 if (ret) 1999 goto cleanup; 2000 } 2001 2002 if (xis.not_found && xbs.not_found) { 2003 ret = -ENODATA; 2004 if (flags & XATTR_REPLACE) 2005 goto cleanup; 2006 ret = 0; 2007 if (!value) 2008 goto cleanup; 2009 } else { 2010 ret = -EEXIST; 2011 if (flags & XATTR_CREATE) 2012 goto cleanup; 2013 } 2014 2015 if (!value) { 2016 /* Remove existing extended attribute */ 2017 if (!xis.not_found) 2018 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2019 else if (!xbs.not_found) 2020 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2021 } else { 2022 /* We always try to set extended attribute into inode first*/ 2023 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2024 if (!ret && !xbs.not_found) { 2025 /* 2026 * If succeed and that extended attribute existing in 2027 * external block, then we will remove it. 2028 */ 2029 xi.value = NULL; 2030 xi.value_len = 0; 2031 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2032 } else if (ret == -ENOSPC) { 2033 if (di->i_xattr_loc && !xbs.xattr_bh) { 2034 ret = ocfs2_xattr_block_find(inode, name_index, 2035 name, &xbs); 2036 if (ret) 2037 goto cleanup; 2038 } 2039 /* 2040 * If no space in inode, we will set extended attribute 2041 * into external block. 2042 */ 2043 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2044 if (ret) 2045 goto cleanup; 2046 if (!xis.not_found) { 2047 /* 2048 * If succeed and that extended attribute 2049 * existing in inode, we will remove it. 2050 */ 2051 xi.value = NULL; 2052 xi.value_len = 0; 2053 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2054 } 2055 } 2056 } 2057 cleanup: 2058 up_write(&OCFS2_I(inode)->ip_xattr_sem); 2059 ocfs2_inode_unlock(inode, 1); 2060 brelse(di_bh); 2061 brelse(xbs.xattr_bh); 2062 for (i = 0; i < blk_per_bucket; i++) 2063 brelse(xbs.bucket.bhs[i]); 2064 2065 return ret; 2066 } 2067 2068 static inline u32 ocfs2_xattr_hash_by_name(struct inode *inode, 2069 int name_index, 2070 const char *suffix_name) 2071 { 2072 struct xattr_handler *handler = ocfs2_xattr_handler(name_index); 2073 char *prefix = handler->prefix; 2074 int prefix_len = strlen(handler->prefix); 2075 2076 return ocfs2_xattr_name_hash(inode, prefix, prefix_len, 2077 (char *)suffix_name, strlen(suffix_name)); 2078 } 2079 2080 /* 2081 * Find the xattr extent rec which may contains name_hash. 2082 * e_cpos will be the first name hash of the xattr rec. 2083 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list. 2084 */ 2085 static int ocfs2_xattr_get_rec(struct inode *inode, 2086 u32 name_hash, 2087 u64 *p_blkno, 2088 u32 *e_cpos, 2089 u32 *num_clusters, 2090 struct ocfs2_extent_list *el) 2091 { 2092 int ret = 0, i; 2093 struct buffer_head *eb_bh = NULL; 2094 struct ocfs2_extent_block *eb; 2095 struct ocfs2_extent_rec *rec = NULL; 2096 u64 e_blkno = 0; 2097 2098 if (el->l_tree_depth) { 2099 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh); 2100 if (ret) { 2101 mlog_errno(ret); 2102 goto out; 2103 } 2104 2105 eb = (struct ocfs2_extent_block *) eb_bh->b_data; 2106 el = &eb->h_list; 2107 2108 if (el->l_tree_depth) { 2109 ocfs2_error(inode->i_sb, 2110 "Inode %lu has non zero tree depth in " 2111 "xattr tree block %llu\n", inode->i_ino, 2112 (unsigned long long)eb_bh->b_blocknr); 2113 ret = -EROFS; 2114 goto out; 2115 } 2116 } 2117 2118 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { 2119 rec = &el->l_recs[i]; 2120 2121 if (le32_to_cpu(rec->e_cpos) <= name_hash) { 2122 e_blkno = le64_to_cpu(rec->e_blkno); 2123 break; 2124 } 2125 } 2126 2127 if (!e_blkno) { 2128 ocfs2_error(inode->i_sb, "Inode %lu has bad extent " 2129 "record (%u, %u, 0) in xattr", inode->i_ino, 2130 le32_to_cpu(rec->e_cpos), 2131 ocfs2_rec_clusters(el, rec)); 2132 ret = -EROFS; 2133 goto out; 2134 } 2135 2136 *p_blkno = le64_to_cpu(rec->e_blkno); 2137 *num_clusters = le16_to_cpu(rec->e_leaf_clusters); 2138 if (e_cpos) 2139 *e_cpos = le32_to_cpu(rec->e_cpos); 2140 out: 2141 brelse(eb_bh); 2142 return ret; 2143 } 2144 2145 typedef int (xattr_bucket_func)(struct inode *inode, 2146 struct ocfs2_xattr_bucket *bucket, 2147 void *para); 2148 2149 static int ocfs2_find_xe_in_bucket(struct inode *inode, 2150 struct buffer_head *header_bh, 2151 int name_index, 2152 const char *name, 2153 u32 name_hash, 2154 u16 *xe_index, 2155 int *found) 2156 { 2157 int i, ret = 0, cmp = 1, block_off, new_offset; 2158 struct ocfs2_xattr_header *xh = 2159 (struct ocfs2_xattr_header *)header_bh->b_data; 2160 size_t name_len = strlen(name); 2161 struct ocfs2_xattr_entry *xe = NULL; 2162 struct buffer_head *name_bh = NULL; 2163 char *xe_name; 2164 2165 /* 2166 * We don't use binary search in the bucket because there 2167 * may be multiple entries with the same name hash. 2168 */ 2169 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 2170 xe = &xh->xh_entries[i]; 2171 2172 if (name_hash > le32_to_cpu(xe->xe_name_hash)) 2173 continue; 2174 else if (name_hash < le32_to_cpu(xe->xe_name_hash)) 2175 break; 2176 2177 cmp = name_index - ocfs2_xattr_get_type(xe); 2178 if (!cmp) 2179 cmp = name_len - xe->xe_name_len; 2180 if (cmp) 2181 continue; 2182 2183 ret = ocfs2_xattr_bucket_get_name_value(inode, 2184 xh, 2185 i, 2186 &block_off, 2187 &new_offset); 2188 if (ret) { 2189 mlog_errno(ret); 2190 break; 2191 } 2192 2193 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 2194 header_bh->b_blocknr + block_off, 2195 &name_bh, OCFS2_BH_CACHED, inode); 2196 if (ret) { 2197 mlog_errno(ret); 2198 break; 2199 } 2200 xe_name = name_bh->b_data + new_offset; 2201 2202 cmp = memcmp(name, xe_name, name_len); 2203 brelse(name_bh); 2204 name_bh = NULL; 2205 2206 if (cmp == 0) { 2207 *xe_index = i; 2208 *found = 1; 2209 ret = 0; 2210 break; 2211 } 2212 } 2213 2214 return ret; 2215 } 2216 2217 /* 2218 * Find the specified xattr entry in a series of buckets. 2219 * This series start from p_blkno and last for num_clusters. 2220 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains 2221 * the num of the valid buckets. 2222 * 2223 * Return the buffer_head this xattr should reside in. And if the xattr's 2224 * hash is in the gap of 2 buckets, return the lower bucket. 2225 */ 2226 static int ocfs2_xattr_bucket_find(struct inode *inode, 2227 int name_index, 2228 const char *name, 2229 u32 name_hash, 2230 u64 p_blkno, 2231 u32 first_hash, 2232 u32 num_clusters, 2233 struct ocfs2_xattr_search *xs) 2234 { 2235 int ret, found = 0; 2236 struct buffer_head *bh = NULL; 2237 struct buffer_head *lower_bh = NULL; 2238 struct ocfs2_xattr_header *xh = NULL; 2239 struct ocfs2_xattr_entry *xe = NULL; 2240 u16 index = 0; 2241 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2242 int low_bucket = 0, bucket, high_bucket; 2243 u32 last_hash; 2244 u64 blkno; 2245 2246 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, 2247 &bh, OCFS2_BH_CACHED, inode); 2248 if (ret) { 2249 mlog_errno(ret); 2250 goto out; 2251 } 2252 2253 xh = (struct ocfs2_xattr_header *)bh->b_data; 2254 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1; 2255 2256 while (low_bucket <= high_bucket) { 2257 brelse(bh); 2258 bh = NULL; 2259 bucket = (low_bucket + high_bucket) / 2; 2260 2261 blkno = p_blkno + bucket * blk_per_bucket; 2262 2263 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 2264 &bh, OCFS2_BH_CACHED, inode); 2265 if (ret) { 2266 mlog_errno(ret); 2267 goto out; 2268 } 2269 2270 xh = (struct ocfs2_xattr_header *)bh->b_data; 2271 xe = &xh->xh_entries[0]; 2272 if (name_hash < le32_to_cpu(xe->xe_name_hash)) { 2273 high_bucket = bucket - 1; 2274 continue; 2275 } 2276 2277 /* 2278 * Check whether the hash of the last entry in our 2279 * bucket is larger than the search one. 2280 */ 2281 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1]; 2282 last_hash = le32_to_cpu(xe->xe_name_hash); 2283 2284 /* record lower_bh which may be the insert place. */ 2285 brelse(lower_bh); 2286 lower_bh = bh; 2287 bh = NULL; 2288 2289 if (name_hash > le32_to_cpu(xe->xe_name_hash)) { 2290 low_bucket = bucket + 1; 2291 continue; 2292 } 2293 2294 /* the searched xattr should reside in this bucket if exists. */ 2295 ret = ocfs2_find_xe_in_bucket(inode, lower_bh, 2296 name_index, name, name_hash, 2297 &index, &found); 2298 if (ret) { 2299 mlog_errno(ret); 2300 goto out; 2301 } 2302 break; 2303 } 2304 2305 /* 2306 * Record the bucket we have found. 2307 * When the xattr's hash value is in the gap of 2 buckets, we will 2308 * always set it to the previous bucket. 2309 */ 2310 if (!lower_bh) { 2311 /* 2312 * We can't find any bucket whose first name_hash is less 2313 * than the find name_hash. 2314 */ 2315 BUG_ON(bh->b_blocknr != p_blkno); 2316 lower_bh = bh; 2317 bh = NULL; 2318 } 2319 xs->bucket.bhs[0] = lower_bh; 2320 xs->bucket.xh = (struct ocfs2_xattr_header *) 2321 xs->bucket.bhs[0]->b_data; 2322 lower_bh = NULL; 2323 2324 xs->header = xs->bucket.xh; 2325 xs->base = xs->bucket.bhs[0]->b_data; 2326 xs->end = xs->base + inode->i_sb->s_blocksize; 2327 2328 if (found) { 2329 /* 2330 * If we have found the xattr enty, read all the blocks in 2331 * this bucket. 2332 */ 2333 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2334 xs->bucket.bhs[0]->b_blocknr + 1, 2335 blk_per_bucket - 1, &xs->bucket.bhs[1], 2336 OCFS2_BH_CACHED, inode); 2337 if (ret) { 2338 mlog_errno(ret); 2339 goto out; 2340 } 2341 2342 xs->here = &xs->header->xh_entries[index]; 2343 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name, 2344 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index); 2345 } else 2346 ret = -ENODATA; 2347 2348 out: 2349 brelse(bh); 2350 brelse(lower_bh); 2351 return ret; 2352 } 2353 2354 static int ocfs2_xattr_index_block_find(struct inode *inode, 2355 struct buffer_head *root_bh, 2356 int name_index, 2357 const char *name, 2358 struct ocfs2_xattr_search *xs) 2359 { 2360 int ret; 2361 struct ocfs2_xattr_block *xb = 2362 (struct ocfs2_xattr_block *)root_bh->b_data; 2363 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 2364 struct ocfs2_extent_list *el = &xb_root->xt_list; 2365 u64 p_blkno = 0; 2366 u32 first_hash, num_clusters = 0; 2367 u32 name_hash = ocfs2_xattr_hash_by_name(inode, name_index, name); 2368 2369 if (le16_to_cpu(el->l_next_free_rec) == 0) 2370 return -ENODATA; 2371 2372 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n", 2373 name, name_hash, name_index); 2374 2375 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash, 2376 &num_clusters, el); 2377 if (ret) { 2378 mlog_errno(ret); 2379 goto out; 2380 } 2381 2382 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash); 2383 2384 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash " 2385 "in the rec is %u\n", num_clusters, p_blkno, first_hash); 2386 2387 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash, 2388 p_blkno, first_hash, num_clusters, xs); 2389 2390 out: 2391 return ret; 2392 } 2393 2394 static int ocfs2_iterate_xattr_buckets(struct inode *inode, 2395 u64 blkno, 2396 u32 clusters, 2397 xattr_bucket_func *func, 2398 void *para) 2399 { 2400 int i, j, ret = 0; 2401 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2402 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)); 2403 u32 num_buckets = clusters * bpc; 2404 struct ocfs2_xattr_bucket bucket; 2405 2406 memset(&bucket, 0, sizeof(bucket)); 2407 2408 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n", 2409 clusters, blkno); 2410 2411 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) { 2412 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2413 blkno, blk_per_bucket, 2414 bucket.bhs, OCFS2_BH_CACHED, inode); 2415 if (ret) { 2416 mlog_errno(ret); 2417 goto out; 2418 } 2419 2420 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data; 2421 /* 2422 * The real bucket num in this series of blocks is stored 2423 * in the 1st bucket. 2424 */ 2425 if (i == 0) 2426 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets); 2427 2428 mlog(0, "iterating xattr bucket %llu\n", blkno); 2429 if (func) { 2430 ret = func(inode, &bucket, para); 2431 if (ret) { 2432 mlog_errno(ret); 2433 break; 2434 } 2435 } 2436 2437 for (j = 0; j < blk_per_bucket; j++) 2438 brelse(bucket.bhs[j]); 2439 memset(&bucket, 0, sizeof(bucket)); 2440 } 2441 2442 out: 2443 for (j = 0; j < blk_per_bucket; j++) 2444 brelse(bucket.bhs[j]); 2445 2446 return ret; 2447 } 2448 2449 struct ocfs2_xattr_tree_list { 2450 char *buffer; 2451 size_t buffer_size; 2452 }; 2453 2454 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, 2455 struct ocfs2_xattr_header *xh, 2456 int index, 2457 int *block_off, 2458 int *new_offset) 2459 { 2460 u16 name_offset; 2461 2462 if (index < 0 || index >= le16_to_cpu(xh->xh_count)) 2463 return -EINVAL; 2464 2465 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset); 2466 2467 *block_off = name_offset >> inode->i_sb->s_blocksize_bits; 2468 *new_offset = name_offset % inode->i_sb->s_blocksize; 2469 2470 return 0; 2471 } 2472 2473 static int ocfs2_list_xattr_bucket(struct inode *inode, 2474 struct ocfs2_xattr_bucket *bucket, 2475 void *para) 2476 { 2477 int ret = 0; 2478 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para; 2479 size_t size; 2480 int i, block_off, new_offset; 2481 2482 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) { 2483 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i]; 2484 struct xattr_handler *handler = 2485 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); 2486 2487 if (handler) { 2488 ret = ocfs2_xattr_bucket_get_name_value(inode, 2489 bucket->xh, 2490 i, 2491 &block_off, 2492 &new_offset); 2493 if (ret) 2494 break; 2495 size = handler->list(inode, xl->buffer, xl->buffer_size, 2496 bucket->bhs[block_off]->b_data + 2497 new_offset, 2498 entry->xe_name_len); 2499 if (xl->buffer) { 2500 if (size > xl->buffer_size) 2501 return -ERANGE; 2502 xl->buffer += size; 2503 } 2504 xl->buffer_size -= size; 2505 } 2506 } 2507 2508 return ret; 2509 } 2510 2511 static int ocfs2_xattr_tree_list_index_block(struct inode *inode, 2512 struct ocfs2_xattr_tree_root *xt, 2513 char *buffer, 2514 size_t buffer_size) 2515 { 2516 struct ocfs2_extent_list *el = &xt->xt_list; 2517 int ret = 0; 2518 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0; 2519 u64 p_blkno = 0; 2520 struct ocfs2_xattr_tree_list xl = { 2521 .buffer = buffer, 2522 .buffer_size = buffer_size, 2523 }; 2524 2525 if (le16_to_cpu(el->l_next_free_rec) == 0) 2526 return 0; 2527 2528 while (name_hash > 0) { 2529 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 2530 &e_cpos, &num_clusters, el); 2531 if (ret) { 2532 mlog_errno(ret); 2533 goto out; 2534 } 2535 2536 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 2537 ocfs2_list_xattr_bucket, 2538 &xl); 2539 if (ret) { 2540 mlog_errno(ret); 2541 goto out; 2542 } 2543 2544 if (e_cpos == 0) 2545 break; 2546 2547 name_hash = e_cpos - 1; 2548 } 2549 2550 ret = buffer_size - xl.buffer_size; 2551 out: 2552 return ret; 2553 } 2554 2555 static int cmp_xe(const void *a, const void *b) 2556 { 2557 const struct ocfs2_xattr_entry *l = a, *r = b; 2558 u32 l_hash = le32_to_cpu(l->xe_name_hash); 2559 u32 r_hash = le32_to_cpu(r->xe_name_hash); 2560 2561 if (l_hash > r_hash) 2562 return 1; 2563 if (l_hash < r_hash) 2564 return -1; 2565 return 0; 2566 } 2567 2568 static void swap_xe(void *a, void *b, int size) 2569 { 2570 struct ocfs2_xattr_entry *l = a, *r = b, tmp; 2571 2572 tmp = *l; 2573 memcpy(l, r, sizeof(struct ocfs2_xattr_entry)); 2574 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry)); 2575 } 2576 2577 /* 2578 * When the ocfs2_xattr_block is filled up, new bucket will be created 2579 * and all the xattr entries will be moved to the new bucket. 2580 * Note: we need to sort the entries since they are not saved in order 2581 * in the ocfs2_xattr_block. 2582 */ 2583 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode, 2584 struct buffer_head *xb_bh, 2585 struct buffer_head *xh_bh, 2586 struct buffer_head *data_bh) 2587 { 2588 int i, blocksize = inode->i_sb->s_blocksize; 2589 u16 offset, size, off_change; 2590 struct ocfs2_xattr_entry *xe; 2591 struct ocfs2_xattr_block *xb = 2592 (struct ocfs2_xattr_block *)xb_bh->b_data; 2593 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header; 2594 struct ocfs2_xattr_header *xh = 2595 (struct ocfs2_xattr_header *)xh_bh->b_data; 2596 u16 count = le16_to_cpu(xb_xh->xh_count); 2597 char *target = xh_bh->b_data, *src = xb_bh->b_data; 2598 2599 mlog(0, "cp xattr from block %llu to bucket %llu\n", 2600 (unsigned long long)xb_bh->b_blocknr, 2601 (unsigned long long)xh_bh->b_blocknr); 2602 2603 memset(xh_bh->b_data, 0, blocksize); 2604 if (data_bh) 2605 memset(data_bh->b_data, 0, blocksize); 2606 /* 2607 * Since the xe_name_offset is based on ocfs2_xattr_header, 2608 * there is a offset change corresponding to the change of 2609 * ocfs2_xattr_header's position. 2610 */ 2611 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2612 xe = &xb_xh->xh_entries[count - 1]; 2613 offset = le16_to_cpu(xe->xe_name_offset) + off_change; 2614 size = blocksize - offset; 2615 2616 /* copy all the names and values. */ 2617 if (data_bh) 2618 target = data_bh->b_data; 2619 memcpy(target + offset, src + offset, size); 2620 2621 /* Init new header now. */ 2622 xh->xh_count = xb_xh->xh_count; 2623 xh->xh_num_buckets = cpu_to_le16(1); 2624 xh->xh_name_value_len = cpu_to_le16(size); 2625 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size); 2626 2627 /* copy all the entries. */ 2628 target = xh_bh->b_data; 2629 offset = offsetof(struct ocfs2_xattr_header, xh_entries); 2630 size = count * sizeof(struct ocfs2_xattr_entry); 2631 memcpy(target + offset, (char *)xb_xh + offset, size); 2632 2633 /* Change the xe offset for all the xe because of the move. */ 2634 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize + 2635 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2636 for (i = 0; i < count; i++) 2637 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change); 2638 2639 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n", 2640 offset, size, off_change); 2641 2642 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry), 2643 cmp_xe, swap_xe); 2644 } 2645 2646 /* 2647 * After we move xattr from block to index btree, we have to 2648 * update ocfs2_xattr_search to the new xe and base. 2649 * 2650 * When the entry is in xattr block, xattr_bh indicates the storage place. 2651 * While if the entry is in index b-tree, "bucket" indicates the 2652 * real place of the xattr. 2653 */ 2654 static int ocfs2_xattr_update_xattr_search(struct inode *inode, 2655 struct ocfs2_xattr_search *xs, 2656 struct buffer_head *old_bh, 2657 struct buffer_head *new_bh) 2658 { 2659 int ret = 0; 2660 char *buf = old_bh->b_data; 2661 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf; 2662 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header; 2663 int i, blocksize = inode->i_sb->s_blocksize; 2664 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2665 2666 xs->bucket.bhs[0] = new_bh; 2667 get_bh(new_bh); 2668 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data; 2669 xs->header = xs->bucket.xh; 2670 2671 xs->base = new_bh->b_data; 2672 xs->end = xs->base + inode->i_sb->s_blocksize; 2673 2674 if (!xs->not_found) { 2675 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) { 2676 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2677 xs->bucket.bhs[0]->b_blocknr + 1, 2678 blk_per_bucket - 1, &xs->bucket.bhs[1], 2679 OCFS2_BH_CACHED, inode); 2680 if (ret) { 2681 mlog_errno(ret); 2682 return ret; 2683 } 2684 2685 i = xs->here - old_xh->xh_entries; 2686 xs->here = &xs->header->xh_entries[i]; 2687 } 2688 } 2689 2690 return ret; 2691 } 2692 2693 static int ocfs2_xattr_create_index_block(struct inode *inode, 2694 struct ocfs2_xattr_search *xs) 2695 { 2696 int ret, credits = OCFS2_SUBALLOC_ALLOC; 2697 u32 bit_off, len; 2698 u64 blkno; 2699 handle_t *handle; 2700 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2701 struct ocfs2_inode_info *oi = OCFS2_I(inode); 2702 struct ocfs2_alloc_context *data_ac; 2703 struct buffer_head *xh_bh = NULL, *data_bh = NULL; 2704 struct buffer_head *xb_bh = xs->xattr_bh; 2705 struct ocfs2_xattr_block *xb = 2706 (struct ocfs2_xattr_block *)xb_bh->b_data; 2707 struct ocfs2_xattr_tree_root *xr; 2708 u16 xb_flags = le16_to_cpu(xb->xb_flags); 2709 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2710 2711 mlog(0, "create xattr index block for %llu\n", 2712 (unsigned long long)xb_bh->b_blocknr); 2713 2714 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED); 2715 2716 ret = ocfs2_reserve_clusters(osb, 1, &data_ac); 2717 if (ret) { 2718 mlog_errno(ret); 2719 goto out; 2720 } 2721 2722 /* 2723 * XXX: 2724 * We can use this lock for now, and maybe move to a dedicated mutex 2725 * if performance becomes a problem later. 2726 */ 2727 down_write(&oi->ip_alloc_sem); 2728 2729 /* 2730 * 3 more credits, one for xattr block update, one for the 1st block 2731 * of the new xattr bucket and one for the value/data. 2732 */ 2733 credits += 3; 2734 handle = ocfs2_start_trans(osb, credits); 2735 if (IS_ERR(handle)) { 2736 ret = PTR_ERR(handle); 2737 mlog_errno(ret); 2738 goto out_sem; 2739 } 2740 2741 ret = ocfs2_journal_access(handle, inode, xb_bh, 2742 OCFS2_JOURNAL_ACCESS_WRITE); 2743 if (ret) { 2744 mlog_errno(ret); 2745 goto out_commit; 2746 } 2747 2748 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len); 2749 if (ret) { 2750 mlog_errno(ret); 2751 goto out_commit; 2752 } 2753 2754 /* 2755 * The bucket may spread in many blocks, and 2756 * we will only touch the 1st block and the last block 2757 * in the whole bucket(one for entry and one for data). 2758 */ 2759 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off); 2760 2761 mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno); 2762 2763 xh_bh = sb_getblk(inode->i_sb, blkno); 2764 if (!xh_bh) { 2765 ret = -EIO; 2766 mlog_errno(ret); 2767 goto out_commit; 2768 } 2769 2770 ocfs2_set_new_buffer_uptodate(inode, xh_bh); 2771 2772 ret = ocfs2_journal_access(handle, inode, xh_bh, 2773 OCFS2_JOURNAL_ACCESS_CREATE); 2774 if (ret) { 2775 mlog_errno(ret); 2776 goto out_commit; 2777 } 2778 2779 if (bpb > 1) { 2780 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1); 2781 if (!data_bh) { 2782 ret = -EIO; 2783 mlog_errno(ret); 2784 goto out_commit; 2785 } 2786 2787 ocfs2_set_new_buffer_uptodate(inode, data_bh); 2788 2789 ret = ocfs2_journal_access(handle, inode, data_bh, 2790 OCFS2_JOURNAL_ACCESS_CREATE); 2791 if (ret) { 2792 mlog_errno(ret); 2793 goto out_commit; 2794 } 2795 } 2796 2797 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh); 2798 2799 ocfs2_journal_dirty(handle, xh_bh); 2800 if (data_bh) 2801 ocfs2_journal_dirty(handle, data_bh); 2802 2803 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh); 2804 2805 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */ 2806 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 2807 offsetof(struct ocfs2_xattr_block, xb_attrs)); 2808 2809 xr = &xb->xb_attrs.xb_root; 2810 xr->xt_clusters = cpu_to_le32(1); 2811 xr->xt_last_eb_blk = 0; 2812 xr->xt_list.l_tree_depth = 0; 2813 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb)); 2814 xr->xt_list.l_next_free_rec = cpu_to_le16(1); 2815 2816 xr->xt_list.l_recs[0].e_cpos = 0; 2817 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno); 2818 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1); 2819 2820 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED); 2821 2822 ret = ocfs2_journal_dirty(handle, xb_bh); 2823 if (ret) { 2824 mlog_errno(ret); 2825 goto out_commit; 2826 } 2827 2828 out_commit: 2829 ocfs2_commit_trans(osb, handle); 2830 2831 out_sem: 2832 up_write(&oi->ip_alloc_sem); 2833 2834 out: 2835 if (data_ac) 2836 ocfs2_free_alloc_context(data_ac); 2837 2838 brelse(xh_bh); 2839 brelse(data_bh); 2840 2841 return ret; 2842 } 2843 2844 static int cmp_xe_offset(const void *a, const void *b) 2845 { 2846 const struct ocfs2_xattr_entry *l = a, *r = b; 2847 u32 l_name_offset = le16_to_cpu(l->xe_name_offset); 2848 u32 r_name_offset = le16_to_cpu(r->xe_name_offset); 2849 2850 if (l_name_offset < r_name_offset) 2851 return 1; 2852 if (l_name_offset > r_name_offset) 2853 return -1; 2854 return 0; 2855 } 2856 2857 /* 2858 * defrag a xattr bucket if we find that the bucket has some 2859 * holes beteen name/value pairs. 2860 * We will move all the name/value pairs to the end of the bucket 2861 * so that we can spare some space for insertion. 2862 */ 2863 static int ocfs2_defrag_xattr_bucket(struct inode *inode, 2864 struct ocfs2_xattr_bucket *bucket) 2865 { 2866 int ret, i; 2867 size_t end, offset, len, value_len; 2868 struct ocfs2_xattr_header *xh; 2869 char *entries, *buf, *bucket_buf = NULL; 2870 u64 blkno = bucket->bhs[0]->b_blocknr; 2871 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2872 u16 xh_free_start; 2873 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2874 size_t blocksize = inode->i_sb->s_blocksize; 2875 handle_t *handle; 2876 struct buffer_head **bhs; 2877 struct ocfs2_xattr_entry *xe; 2878 2879 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 2880 GFP_NOFS); 2881 if (!bhs) 2882 return -ENOMEM; 2883 2884 ret = ocfs2_read_blocks(osb, blkno, blk_per_bucket, bhs, 2885 OCFS2_BH_CACHED, inode); 2886 if (ret) 2887 goto out; 2888 2889 /* 2890 * In order to make the operation more efficient and generic, 2891 * we copy all the blocks into a contiguous memory and do the 2892 * defragment there, so if anything is error, we will not touch 2893 * the real block. 2894 */ 2895 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS); 2896 if (!bucket_buf) { 2897 ret = -EIO; 2898 goto out; 2899 } 2900 2901 buf = bucket_buf; 2902 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) 2903 memcpy(buf, bhs[i]->b_data, blocksize); 2904 2905 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket); 2906 if (IS_ERR(handle)) { 2907 ret = PTR_ERR(handle); 2908 handle = NULL; 2909 mlog_errno(ret); 2910 goto out; 2911 } 2912 2913 for (i = 0; i < blk_per_bucket; i++) { 2914 ret = ocfs2_journal_access(handle, inode, bhs[i], 2915 OCFS2_JOURNAL_ACCESS_WRITE); 2916 if (ret < 0) { 2917 mlog_errno(ret); 2918 goto commit; 2919 } 2920 } 2921 2922 xh = (struct ocfs2_xattr_header *)bucket_buf; 2923 entries = (char *)xh->xh_entries; 2924 xh_free_start = le16_to_cpu(xh->xh_free_start); 2925 2926 mlog(0, "adjust xattr bucket in %llu, count = %u, " 2927 "xh_free_start = %u, xh_name_value_len = %u.\n", 2928 blkno, le16_to_cpu(xh->xh_count), xh_free_start, 2929 le16_to_cpu(xh->xh_name_value_len)); 2930 2931 /* 2932 * sort all the entries by their offset. 2933 * the largest will be the first, so that we can 2934 * move them to the end one by one. 2935 */ 2936 sort(entries, le16_to_cpu(xh->xh_count), 2937 sizeof(struct ocfs2_xattr_entry), 2938 cmp_xe_offset, swap_xe); 2939 2940 /* Move all name/values to the end of the bucket. */ 2941 xe = xh->xh_entries; 2942 end = OCFS2_XATTR_BUCKET_SIZE; 2943 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) { 2944 offset = le16_to_cpu(xe->xe_name_offset); 2945 if (ocfs2_xattr_is_local(xe)) 2946 value_len = OCFS2_XATTR_SIZE( 2947 le64_to_cpu(xe->xe_value_size)); 2948 else 2949 value_len = OCFS2_XATTR_ROOT_SIZE; 2950 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len; 2951 2952 /* 2953 * We must make sure that the name/value pair 2954 * exist in the same block. So adjust end to 2955 * the previous block end if needed. 2956 */ 2957 if (((end - len) / blocksize != 2958 (end - 1) / blocksize)) 2959 end = end - end % blocksize; 2960 2961 if (end > offset + len) { 2962 memmove(bucket_buf + end - len, 2963 bucket_buf + offset, len); 2964 xe->xe_name_offset = cpu_to_le16(end - len); 2965 } 2966 2967 mlog_bug_on_msg(end < offset + len, "Defrag check failed for " 2968 "bucket %llu\n", (unsigned long long)blkno); 2969 2970 end -= len; 2971 } 2972 2973 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for " 2974 "bucket %llu\n", (unsigned long long)blkno); 2975 2976 if (xh_free_start == end) 2977 goto commit; 2978 2979 memset(bucket_buf + xh_free_start, 0, end - xh_free_start); 2980 xh->xh_free_start = cpu_to_le16(end); 2981 2982 /* sort the entries by their name_hash. */ 2983 sort(entries, le16_to_cpu(xh->xh_count), 2984 sizeof(struct ocfs2_xattr_entry), 2985 cmp_xe, swap_xe); 2986 2987 buf = bucket_buf; 2988 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) { 2989 memcpy(bhs[i]->b_data, buf, blocksize); 2990 ocfs2_journal_dirty(handle, bhs[i]); 2991 } 2992 2993 commit: 2994 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 2995 out: 2996 2997 if (bhs) { 2998 for (i = 0; i < blk_per_bucket; i++) 2999 brelse(bhs[i]); 3000 } 3001 kfree(bhs); 3002 3003 kfree(bucket_buf); 3004 return ret; 3005 } 3006 3007 /* 3008 * Move half nums of the xattr bucket in the previous cluster to this new 3009 * cluster. We only touch the last cluster of the previous extend record. 3010 * 3011 * first_bh is the first buffer_head of a series of bucket in the same 3012 * extent rec and header_bh is the header of one bucket in this cluster. 3013 * They will be updated if we move the data header_bh contains to the new 3014 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster. 3015 */ 3016 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode, 3017 handle_t *handle, 3018 struct buffer_head **first_bh, 3019 struct buffer_head **header_bh, 3020 u64 new_blkno, 3021 u64 prev_blkno, 3022 u32 num_clusters, 3023 u32 *first_hash) 3024 { 3025 int i, ret, credits; 3026 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3027 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3028 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3029 int blocksize = inode->i_sb->s_blocksize; 3030 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL; 3031 struct ocfs2_xattr_header *new_xh; 3032 struct ocfs2_xattr_header *xh = 3033 (struct ocfs2_xattr_header *)((*first_bh)->b_data); 3034 3035 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets); 3036 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize); 3037 3038 prev_bh = *first_bh; 3039 get_bh(prev_bh); 3040 xh = (struct ocfs2_xattr_header *)prev_bh->b_data; 3041 3042 prev_blkno += (num_clusters - 1) * bpc + bpc / 2; 3043 3044 mlog(0, "move half of xattrs in cluster %llu to %llu\n", 3045 prev_blkno, new_blkno); 3046 3047 /* 3048 * We need to update the 1st half of the new cluster and 3049 * 1 more for the update of the 1st bucket of the previous 3050 * extent record. 3051 */ 3052 credits = bpc / 2 + 1; 3053 ret = ocfs2_extend_trans(handle, credits); 3054 if (ret) { 3055 mlog_errno(ret); 3056 goto out; 3057 } 3058 3059 ret = ocfs2_journal_access(handle, inode, prev_bh, 3060 OCFS2_JOURNAL_ACCESS_WRITE); 3061 if (ret) { 3062 mlog_errno(ret); 3063 goto out; 3064 } 3065 3066 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) { 3067 old_bh = new_bh = NULL; 3068 new_bh = sb_getblk(inode->i_sb, new_blkno); 3069 if (!new_bh) { 3070 ret = -EIO; 3071 mlog_errno(ret); 3072 goto out; 3073 } 3074 3075 ocfs2_set_new_buffer_uptodate(inode, new_bh); 3076 3077 ret = ocfs2_journal_access(handle, inode, new_bh, 3078 OCFS2_JOURNAL_ACCESS_CREATE); 3079 if (ret < 0) { 3080 mlog_errno(ret); 3081 brelse(new_bh); 3082 goto out; 3083 } 3084 3085 ret = ocfs2_read_block(osb, prev_blkno, 3086 &old_bh, OCFS2_BH_CACHED, inode); 3087 if (ret < 0) { 3088 mlog_errno(ret); 3089 brelse(new_bh); 3090 goto out; 3091 } 3092 3093 memcpy(new_bh->b_data, old_bh->b_data, blocksize); 3094 3095 if (i == 0) { 3096 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data; 3097 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2); 3098 3099 if (first_hash) 3100 *first_hash = le32_to_cpu( 3101 new_xh->xh_entries[0].xe_name_hash); 3102 new_first_bh = new_bh; 3103 get_bh(new_first_bh); 3104 } 3105 3106 ocfs2_journal_dirty(handle, new_bh); 3107 3108 if (*header_bh == old_bh) { 3109 brelse(*header_bh); 3110 *header_bh = new_bh; 3111 get_bh(*header_bh); 3112 3113 brelse(*first_bh); 3114 *first_bh = new_first_bh; 3115 get_bh(*first_bh); 3116 } 3117 brelse(new_bh); 3118 brelse(old_bh); 3119 } 3120 3121 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2)); 3122 3123 ocfs2_journal_dirty(handle, prev_bh); 3124 out: 3125 brelse(prev_bh); 3126 brelse(new_first_bh); 3127 return ret; 3128 } 3129 3130 static int ocfs2_read_xattr_bucket(struct inode *inode, 3131 u64 blkno, 3132 struct buffer_head **bhs, 3133 int new) 3134 { 3135 int ret = 0; 3136 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3137 3138 if (!new) 3139 return ocfs2_read_blocks(OCFS2_SB(inode->i_sb), blkno, 3140 blk_per_bucket, bhs, 3141 OCFS2_BH_CACHED, inode); 3142 3143 for (i = 0; i < blk_per_bucket; i++) { 3144 bhs[i] = sb_getblk(inode->i_sb, blkno + i); 3145 if (bhs[i] == NULL) { 3146 ret = -EIO; 3147 mlog_errno(ret); 3148 break; 3149 } 3150 ocfs2_set_new_buffer_uptodate(inode, bhs[i]); 3151 } 3152 3153 return ret; 3154 } 3155 3156 /* 3157 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk). 3158 * first_hash will record the 1st hash of the new bucket. 3159 */ 3160 static int ocfs2_half_xattr_bucket(struct inode *inode, 3161 handle_t *handle, 3162 u64 blk, 3163 u64 new_blk, 3164 u32 *first_hash, 3165 int new_bucket_head) 3166 { 3167 int ret, i; 3168 u16 count, start, len, name_value_len, xe_len, name_offset; 3169 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3170 struct buffer_head **s_bhs, **t_bhs = NULL; 3171 struct ocfs2_xattr_header *xh; 3172 struct ocfs2_xattr_entry *xe; 3173 int blocksize = inode->i_sb->s_blocksize; 3174 3175 mlog(0, "move half of xattrs from bucket %llu to %llu\n", 3176 blk, new_blk); 3177 3178 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3179 if (!s_bhs) 3180 return -ENOMEM; 3181 3182 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0); 3183 if (ret) { 3184 mlog_errno(ret); 3185 goto out; 3186 } 3187 3188 ret = ocfs2_journal_access(handle, inode, s_bhs[0], 3189 OCFS2_JOURNAL_ACCESS_WRITE); 3190 if (ret) { 3191 mlog_errno(ret); 3192 goto out; 3193 } 3194 3195 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3196 if (!t_bhs) { 3197 ret = -ENOMEM; 3198 goto out; 3199 } 3200 3201 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head); 3202 if (ret) { 3203 mlog_errno(ret); 3204 goto out; 3205 } 3206 3207 for (i = 0; i < blk_per_bucket; i++) { 3208 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3209 OCFS2_JOURNAL_ACCESS_CREATE); 3210 if (ret) { 3211 mlog_errno(ret); 3212 goto out; 3213 } 3214 } 3215 3216 /* copy the whole bucket to the new first. */ 3217 for (i = 0; i < blk_per_bucket; i++) 3218 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3219 3220 /* update the new bucket. */ 3221 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data; 3222 count = le16_to_cpu(xh->xh_count); 3223 start = count / 2; 3224 3225 /* 3226 * Calculate the total name/value len and xh_free_start for 3227 * the old bucket first. 3228 */ 3229 name_offset = OCFS2_XATTR_BUCKET_SIZE; 3230 name_value_len = 0; 3231 for (i = 0; i < start; i++) { 3232 xe = &xh->xh_entries[i]; 3233 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3234 if (ocfs2_xattr_is_local(xe)) 3235 xe_len += 3236 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3237 else 3238 xe_len += OCFS2_XATTR_ROOT_SIZE; 3239 name_value_len += xe_len; 3240 if (le16_to_cpu(xe->xe_name_offset) < name_offset) 3241 name_offset = le16_to_cpu(xe->xe_name_offset); 3242 } 3243 3244 /* 3245 * Now begin the modification to the new bucket. 3246 * 3247 * In the new bucket, We just move the xattr entry to the beginning 3248 * and don't touch the name/value. So there will be some holes in the 3249 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is 3250 * called. 3251 */ 3252 xe = &xh->xh_entries[start]; 3253 len = sizeof(struct ocfs2_xattr_entry) * (count - start); 3254 mlog(0, "mv xattr entry len %d from %d to %d\n", len, 3255 (char *)xe - (char *)xh, (char *)xh->xh_entries - (char *)xh); 3256 memmove((char *)xh->xh_entries, (char *)xe, len); 3257 xe = &xh->xh_entries[count - start]; 3258 len = sizeof(struct ocfs2_xattr_entry) * start; 3259 memset((char *)xe, 0, len); 3260 3261 le16_add_cpu(&xh->xh_count, -start); 3262 le16_add_cpu(&xh->xh_name_value_len, -name_value_len); 3263 3264 /* Calculate xh_free_start for the new bucket. */ 3265 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); 3266 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 3267 xe = &xh->xh_entries[i]; 3268 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3269 if (ocfs2_xattr_is_local(xe)) 3270 xe_len += 3271 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3272 else 3273 xe_len += OCFS2_XATTR_ROOT_SIZE; 3274 if (le16_to_cpu(xe->xe_name_offset) < 3275 le16_to_cpu(xh->xh_free_start)) 3276 xh->xh_free_start = xe->xe_name_offset; 3277 } 3278 3279 /* set xh->xh_num_buckets for the new xh. */ 3280 if (new_bucket_head) 3281 xh->xh_num_buckets = cpu_to_le16(1); 3282 else 3283 xh->xh_num_buckets = 0; 3284 3285 for (i = 0; i < blk_per_bucket; i++) { 3286 ocfs2_journal_dirty(handle, t_bhs[i]); 3287 if (ret) 3288 mlog_errno(ret); 3289 } 3290 3291 /* store the first_hash of the new bucket. */ 3292 if (first_hash) 3293 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3294 3295 /* 3296 * Now only update the 1st block of the old bucket. 3297 * Please note that the entry has been sorted already above. 3298 */ 3299 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data; 3300 memset(&xh->xh_entries[start], 0, 3301 sizeof(struct ocfs2_xattr_entry) * (count - start)); 3302 xh->xh_count = cpu_to_le16(start); 3303 xh->xh_free_start = cpu_to_le16(name_offset); 3304 xh->xh_name_value_len = cpu_to_le16(name_value_len); 3305 3306 ocfs2_journal_dirty(handle, s_bhs[0]); 3307 if (ret) 3308 mlog_errno(ret); 3309 3310 out: 3311 if (s_bhs) { 3312 for (i = 0; i < blk_per_bucket; i++) 3313 brelse(s_bhs[i]); 3314 } 3315 kfree(s_bhs); 3316 3317 if (t_bhs) { 3318 for (i = 0; i < blk_per_bucket; i++) 3319 brelse(t_bhs[i]); 3320 } 3321 kfree(t_bhs); 3322 3323 return ret; 3324 } 3325 3326 /* 3327 * Copy xattr from one bucket to another bucket. 3328 * 3329 * The caller must make sure that the journal transaction 3330 * has enough space for journaling. 3331 */ 3332 static int ocfs2_cp_xattr_bucket(struct inode *inode, 3333 handle_t *handle, 3334 u64 s_blkno, 3335 u64 t_blkno, 3336 int t_is_new) 3337 { 3338 int ret, i; 3339 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3340 int blocksize = inode->i_sb->s_blocksize; 3341 struct buffer_head **s_bhs, **t_bhs = NULL; 3342 3343 BUG_ON(s_blkno == t_blkno); 3344 3345 mlog(0, "cp bucket %llu to %llu, target is %d\n", 3346 s_blkno, t_blkno, t_is_new); 3347 3348 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3349 GFP_NOFS); 3350 if (!s_bhs) 3351 return -ENOMEM; 3352 3353 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0); 3354 if (ret) 3355 goto out; 3356 3357 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3358 GFP_NOFS); 3359 if (!t_bhs) { 3360 ret = -ENOMEM; 3361 goto out; 3362 } 3363 3364 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new); 3365 if (ret) 3366 goto out; 3367 3368 for (i = 0; i < blk_per_bucket; i++) { 3369 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3370 OCFS2_JOURNAL_ACCESS_WRITE); 3371 if (ret) 3372 goto out; 3373 } 3374 3375 for (i = 0; i < blk_per_bucket; i++) { 3376 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3377 ocfs2_journal_dirty(handle, t_bhs[i]); 3378 } 3379 3380 out: 3381 if (s_bhs) { 3382 for (i = 0; i < blk_per_bucket; i++) 3383 brelse(s_bhs[i]); 3384 } 3385 kfree(s_bhs); 3386 3387 if (t_bhs) { 3388 for (i = 0; i < blk_per_bucket; i++) 3389 brelse(t_bhs[i]); 3390 } 3391 kfree(t_bhs); 3392 3393 return ret; 3394 } 3395 3396 /* 3397 * Copy one xattr cluster from src_blk to to_blk. 3398 * The to_blk will become the first bucket header of the cluster, so its 3399 * xh_num_buckets will be initialized as the bucket num in the cluster. 3400 */ 3401 static int ocfs2_cp_xattr_cluster(struct inode *inode, 3402 handle_t *handle, 3403 struct buffer_head *first_bh, 3404 u64 src_blk, 3405 u64 to_blk, 3406 u32 *first_hash) 3407 { 3408 int i, ret, credits; 3409 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3410 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3411 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3412 struct buffer_head *bh = NULL; 3413 struct ocfs2_xattr_header *xh; 3414 u64 to_blk_start = to_blk; 3415 3416 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk); 3417 3418 /* 3419 * We need to update the new cluster and 1 more for the update of 3420 * the 1st bucket of the previous extent rec. 3421 */ 3422 credits = bpc + 1; 3423 ret = ocfs2_extend_trans(handle, credits); 3424 if (ret) { 3425 mlog_errno(ret); 3426 goto out; 3427 } 3428 3429 ret = ocfs2_journal_access(handle, inode, first_bh, 3430 OCFS2_JOURNAL_ACCESS_WRITE); 3431 if (ret) { 3432 mlog_errno(ret); 3433 goto out; 3434 } 3435 3436 for (i = 0; i < num_buckets; i++) { 3437 ret = ocfs2_cp_xattr_bucket(inode, handle, 3438 src_blk, to_blk, 1); 3439 if (ret) { 3440 mlog_errno(ret); 3441 goto out; 3442 } 3443 3444 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3445 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3446 } 3447 3448 /* update the old bucket header. */ 3449 xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3450 le16_add_cpu(&xh->xh_num_buckets, -num_buckets); 3451 3452 ocfs2_journal_dirty(handle, first_bh); 3453 3454 /* update the new bucket header. */ 3455 ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode); 3456 if (ret < 0) { 3457 mlog_errno(ret); 3458 goto out; 3459 } 3460 3461 ret = ocfs2_journal_access(handle, inode, bh, 3462 OCFS2_JOURNAL_ACCESS_WRITE); 3463 if (ret) { 3464 mlog_errno(ret); 3465 goto out; 3466 } 3467 3468 xh = (struct ocfs2_xattr_header *)bh->b_data; 3469 xh->xh_num_buckets = cpu_to_le16(num_buckets); 3470 3471 ocfs2_journal_dirty(handle, bh); 3472 3473 if (first_hash) 3474 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3475 out: 3476 brelse(bh); 3477 return ret; 3478 } 3479 3480 /* 3481 * Move half of the xattrs in this cluster to the new cluster. 3482 * This function should only be called when bucket size == cluster size. 3483 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead. 3484 */ 3485 static int ocfs2_half_xattr_cluster(struct inode *inode, 3486 handle_t *handle, 3487 u64 prev_blk, 3488 u64 new_blk, 3489 u32 *first_hash) 3490 { 3491 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3492 int ret, credits = 2 * blk_per_bucket; 3493 3494 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize); 3495 3496 ret = ocfs2_extend_trans(handle, credits); 3497 if (ret) { 3498 mlog_errno(ret); 3499 return ret; 3500 } 3501 3502 /* Move half of the xattr in start_blk to the next bucket. */ 3503 return ocfs2_half_xattr_bucket(inode, handle, prev_blk, 3504 new_blk, first_hash, 1); 3505 } 3506 3507 /* 3508 * Move some xattrs from the old cluster to the new one since they are not 3509 * contiguous in ocfs2 xattr tree. 3510 * 3511 * new_blk starts a new separate cluster, and we will move some xattrs from 3512 * prev_blk to it. v_start will be set as the first name hash value in this 3513 * new cluster so that it can be used as e_cpos during tree insertion and 3514 * don't collide with our original b-tree operations. first_bh and header_bh 3515 * will also be updated since they will be used in ocfs2_extend_xattr_bucket 3516 * to extend the insert bucket. 3517 * 3518 * The problem is how much xattr should we move to the new one and when should 3519 * we update first_bh and header_bh? 3520 * 1. If cluster size > bucket size, that means the previous cluster has more 3521 * than 1 bucket, so just move half nums of bucket into the new cluster and 3522 * update the first_bh and header_bh if the insert bucket has been moved 3523 * to the new cluster. 3524 * 2. If cluster_size == bucket_size: 3525 * a) If the previous extent rec has more than one cluster and the insert 3526 * place isn't in the last cluster, copy the entire last cluster to the 3527 * new one. This time, we don't need to upate the first_bh and header_bh 3528 * since they will not be moved into the new cluster. 3529 * b) Otherwise, move the bottom half of the xattrs in the last cluster into 3530 * the new one. And we set the extend flag to zero if the insert place is 3531 * moved into the new allocated cluster since no extend is needed. 3532 */ 3533 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode, 3534 handle_t *handle, 3535 struct buffer_head **first_bh, 3536 struct buffer_head **header_bh, 3537 u64 new_blk, 3538 u64 prev_blk, 3539 u32 prev_clusters, 3540 u32 *v_start, 3541 int *extend) 3542 { 3543 int ret = 0; 3544 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3545 3546 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n", 3547 prev_blk, prev_clusters, new_blk); 3548 3549 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) 3550 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode, 3551 handle, 3552 first_bh, 3553 header_bh, 3554 new_blk, 3555 prev_blk, 3556 prev_clusters, 3557 v_start); 3558 else { 3559 u64 last_blk = prev_blk + bpc * (prev_clusters - 1); 3560 3561 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk) 3562 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh, 3563 last_blk, new_blk, 3564 v_start); 3565 else { 3566 ret = ocfs2_half_xattr_cluster(inode, handle, 3567 last_blk, new_blk, 3568 v_start); 3569 3570 if ((*header_bh)->b_blocknr == last_blk && extend) 3571 *extend = 0; 3572 } 3573 } 3574 3575 return ret; 3576 } 3577 3578 /* 3579 * Add a new cluster for xattr storage. 3580 * 3581 * If the new cluster is contiguous with the previous one, it will be 3582 * appended to the same extent record, and num_clusters will be updated. 3583 * If not, we will insert a new extent for it and move some xattrs in 3584 * the last cluster into the new allocated one. 3585 * We also need to limit the maximum size of a btree leaf, otherwise we'll 3586 * lose the benefits of hashing because we'll have to search large leaves. 3587 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize, 3588 * if it's bigger). 3589 * 3590 * first_bh is the first block of the previous extent rec and header_bh 3591 * indicates the bucket we will insert the new xattrs. They will be updated 3592 * when the header_bh is moved into the new cluster. 3593 */ 3594 static int ocfs2_add_new_xattr_cluster(struct inode *inode, 3595 struct buffer_head *root_bh, 3596 struct buffer_head **first_bh, 3597 struct buffer_head **header_bh, 3598 u32 *num_clusters, 3599 u32 prev_cpos, 3600 u64 prev_blkno, 3601 int *extend) 3602 { 3603 int ret, credits; 3604 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3605 u32 prev_clusters = *num_clusters; 3606 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0; 3607 u64 block; 3608 handle_t *handle = NULL; 3609 struct ocfs2_alloc_context *data_ac = NULL; 3610 struct ocfs2_alloc_context *meta_ac = NULL; 3611 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3612 struct ocfs2_xattr_block *xb = 3613 (struct ocfs2_xattr_block *)root_bh->b_data; 3614 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 3615 struct ocfs2_extent_list *root_el = &xb_root->xt_list; 3616 enum ocfs2_extent_tree_type type = OCFS2_XATTR_TREE_EXTENT; 3617 3618 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, " 3619 "previous xattr blkno = %llu\n", 3620 (unsigned long long)OCFS2_I(inode)->ip_blkno, 3621 prev_cpos, prev_blkno); 3622 3623 ret = ocfs2_lock_allocators(inode, root_bh, root_el, 3624 clusters_to_add, 0, &data_ac, 3625 &meta_ac, type, NULL); 3626 if (ret) { 3627 mlog_errno(ret); 3628 goto leave; 3629 } 3630 3631 credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add); 3632 handle = ocfs2_start_trans(osb, credits); 3633 if (IS_ERR(handle)) { 3634 ret = PTR_ERR(handle); 3635 handle = NULL; 3636 mlog_errno(ret); 3637 goto leave; 3638 } 3639 3640 ret = ocfs2_journal_access(handle, inode, root_bh, 3641 OCFS2_JOURNAL_ACCESS_WRITE); 3642 if (ret < 0) { 3643 mlog_errno(ret); 3644 goto leave; 3645 } 3646 3647 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1, 3648 clusters_to_add, &bit_off, &num_bits); 3649 if (ret < 0) { 3650 if (ret != -ENOSPC) 3651 mlog_errno(ret); 3652 goto leave; 3653 } 3654 3655 BUG_ON(num_bits > clusters_to_add); 3656 3657 block = ocfs2_clusters_to_blocks(osb->sb, bit_off); 3658 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n", 3659 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); 3660 3661 if (prev_blkno + prev_clusters * bpc == block && 3662 (prev_clusters + num_bits) << osb->s_clustersize_bits <= 3663 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) { 3664 /* 3665 * If this cluster is contiguous with the old one and 3666 * adding this new cluster, we don't surpass the limit of 3667 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be 3668 * initialized and used like other buckets in the previous 3669 * cluster. 3670 * So add it as a contiguous one. The caller will handle 3671 * its init process. 3672 */ 3673 v_start = prev_cpos + prev_clusters; 3674 *num_clusters = prev_clusters + num_bits; 3675 mlog(0, "Add contiguous %u clusters to previous extent rec.\n", 3676 num_bits); 3677 } else { 3678 ret = ocfs2_adjust_xattr_cross_cluster(inode, 3679 handle, 3680 first_bh, 3681 header_bh, 3682 block, 3683 prev_blkno, 3684 prev_clusters, 3685 &v_start, 3686 extend); 3687 if (ret) { 3688 mlog_errno(ret); 3689 goto leave; 3690 } 3691 } 3692 3693 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n", 3694 num_bits, block, v_start); 3695 ret = ocfs2_xattr_tree_insert_extent(osb, handle, inode, root_bh, 3696 v_start, block, num_bits, 3697 0, meta_ac); 3698 if (ret < 0) { 3699 mlog_errno(ret); 3700 goto leave; 3701 } 3702 3703 ret = ocfs2_journal_dirty(handle, root_bh); 3704 if (ret < 0) { 3705 mlog_errno(ret); 3706 goto leave; 3707 } 3708 3709 leave: 3710 if (handle) 3711 ocfs2_commit_trans(osb, handle); 3712 if (data_ac) 3713 ocfs2_free_alloc_context(data_ac); 3714 if (meta_ac) 3715 ocfs2_free_alloc_context(meta_ac); 3716 3717 return ret; 3718 } 3719 3720 /* 3721 * Extend a new xattr bucket and move xattrs to the end one by one until 3722 * We meet with start_bh. Only move half of the xattrs to the bucket after it. 3723 */ 3724 static int ocfs2_extend_xattr_bucket(struct inode *inode, 3725 struct buffer_head *first_bh, 3726 struct buffer_head *start_bh, 3727 u32 num_clusters) 3728 { 3729 int ret, credits; 3730 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3731 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3732 u64 start_blk = start_bh->b_blocknr, end_blk; 3733 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb); 3734 handle_t *handle; 3735 struct ocfs2_xattr_header *first_xh = 3736 (struct ocfs2_xattr_header *)first_bh->b_data; 3737 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets); 3738 3739 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting " 3740 "from %llu, len = %u\n", start_blk, 3741 (unsigned long long)first_bh->b_blocknr, num_clusters); 3742 3743 BUG_ON(bucket >= num_buckets); 3744 3745 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket; 3746 3747 /* 3748 * We will touch all the buckets after the start_bh(include it). 3749 * Add one more bucket and modify the first_bh. 3750 */ 3751 credits = end_blk - start_blk + 2 * blk_per_bucket + 1; 3752 handle = ocfs2_start_trans(osb, credits); 3753 if (IS_ERR(handle)) { 3754 ret = PTR_ERR(handle); 3755 handle = NULL; 3756 mlog_errno(ret); 3757 goto out; 3758 } 3759 3760 ret = ocfs2_journal_access(handle, inode, first_bh, 3761 OCFS2_JOURNAL_ACCESS_WRITE); 3762 if (ret) { 3763 mlog_errno(ret); 3764 goto commit; 3765 } 3766 3767 while (end_blk != start_blk) { 3768 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk, 3769 end_blk + blk_per_bucket, 0); 3770 if (ret) 3771 goto commit; 3772 end_blk -= blk_per_bucket; 3773 } 3774 3775 /* Move half of the xattr in start_blk to the next bucket. */ 3776 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk, 3777 start_blk + blk_per_bucket, NULL, 0); 3778 3779 le16_add_cpu(&first_xh->xh_num_buckets, 1); 3780 ocfs2_journal_dirty(handle, first_bh); 3781 3782 commit: 3783 ocfs2_commit_trans(osb, handle); 3784 out: 3785 return ret; 3786 } 3787 3788 /* 3789 * Add new xattr bucket in an extent record and adjust the buckets accordingly. 3790 * xb_bh is the ocfs2_xattr_block. 3791 * We will move all the buckets starting from header_bh to the next place. As 3792 * for this one, half num of its xattrs will be moved to the next one. 3793 * 3794 * We will allocate a new cluster if current cluster is full and adjust 3795 * header_bh and first_bh if the insert place is moved to the new cluster. 3796 */ 3797 static int ocfs2_add_new_xattr_bucket(struct inode *inode, 3798 struct buffer_head *xb_bh, 3799 struct buffer_head *header_bh) 3800 { 3801 struct ocfs2_xattr_header *first_xh = NULL; 3802 struct buffer_head *first_bh = NULL; 3803 struct ocfs2_xattr_block *xb = 3804 (struct ocfs2_xattr_block *)xb_bh->b_data; 3805 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 3806 struct ocfs2_extent_list *el = &xb_root->xt_list; 3807 struct ocfs2_xattr_header *xh = 3808 (struct ocfs2_xattr_header *)header_bh->b_data; 3809 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3810 struct super_block *sb = inode->i_sb; 3811 struct ocfs2_super *osb = OCFS2_SB(sb); 3812 int ret, num_buckets, extend = 1; 3813 u64 p_blkno; 3814 u32 e_cpos, num_clusters; 3815 3816 mlog(0, "Add new xattr bucket starting form %llu\n", 3817 (unsigned long long)header_bh->b_blocknr); 3818 3819 /* 3820 * Add refrence for header_bh here because it may be 3821 * changed in ocfs2_add_new_xattr_cluster and we need 3822 * to free it in the end. 3823 */ 3824 get_bh(header_bh); 3825 3826 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos, 3827 &num_clusters, el); 3828 if (ret) { 3829 mlog_errno(ret); 3830 goto out; 3831 } 3832 3833 ret = ocfs2_read_block(osb, p_blkno, 3834 &first_bh, OCFS2_BH_CACHED, inode); 3835 if (ret) { 3836 mlog_errno(ret); 3837 goto out; 3838 } 3839 3840 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters; 3841 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3842 3843 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) { 3844 ret = ocfs2_add_new_xattr_cluster(inode, 3845 xb_bh, 3846 &first_bh, 3847 &header_bh, 3848 &num_clusters, 3849 e_cpos, 3850 p_blkno, 3851 &extend); 3852 if (ret) { 3853 mlog_errno(ret); 3854 goto out; 3855 } 3856 } 3857 3858 if (extend) 3859 ret = ocfs2_extend_xattr_bucket(inode, 3860 first_bh, 3861 header_bh, 3862 num_clusters); 3863 if (ret) 3864 mlog_errno(ret); 3865 out: 3866 brelse(first_bh); 3867 brelse(header_bh); 3868 return ret; 3869 } 3870 3871 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode, 3872 struct ocfs2_xattr_bucket *bucket, 3873 int offs) 3874 { 3875 int block_off = offs >> inode->i_sb->s_blocksize_bits; 3876 3877 offs = offs % inode->i_sb->s_blocksize; 3878 return bucket->bhs[block_off]->b_data + offs; 3879 } 3880 3881 /* 3882 * Handle the normal xattr set, including replace, delete and new. 3883 * When the bucket is empty, "is_empty" is set and the caller can 3884 * free this bucket. 3885 * 3886 * Note: "local" indicates the real data's locality. So we can't 3887 * just its bucket locality by its length. 3888 */ 3889 static void ocfs2_xattr_set_entry_normal(struct inode *inode, 3890 struct ocfs2_xattr_info *xi, 3891 struct ocfs2_xattr_search *xs, 3892 u32 name_hash, 3893 int local, 3894 int *is_empty) 3895 { 3896 struct ocfs2_xattr_entry *last, *xe; 3897 int name_len = strlen(xi->name); 3898 struct ocfs2_xattr_header *xh = xs->header; 3899 u16 count = le16_to_cpu(xh->xh_count), start; 3900 size_t blocksize = inode->i_sb->s_blocksize; 3901 char *val; 3902 size_t offs, size, new_size; 3903 3904 last = &xh->xh_entries[count]; 3905 if (!xs->not_found) { 3906 xe = xs->here; 3907 offs = le16_to_cpu(xe->xe_name_offset); 3908 if (ocfs2_xattr_is_local(xe)) 3909 size = OCFS2_XATTR_SIZE(name_len) + 3910 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3911 else 3912 size = OCFS2_XATTR_SIZE(name_len) + 3913 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 3914 3915 /* 3916 * If the new value will be stored outside, xi->value has been 3917 * initalized as an empty ocfs2_xattr_value_root, and the same 3918 * goes with xi->value_len, so we can set new_size safely here. 3919 * See ocfs2_xattr_set_in_bucket. 3920 */ 3921 new_size = OCFS2_XATTR_SIZE(name_len) + 3922 OCFS2_XATTR_SIZE(xi->value_len); 3923 3924 le16_add_cpu(&xh->xh_name_value_len, -size); 3925 if (xi->value) { 3926 if (new_size > size) 3927 goto set_new_name_value; 3928 3929 /* Now replace the old value with new one. */ 3930 if (local) 3931 xe->xe_value_size = cpu_to_le64(xi->value_len); 3932 else 3933 xe->xe_value_size = 0; 3934 3935 val = ocfs2_xattr_bucket_get_val(inode, 3936 &xs->bucket, offs); 3937 memset(val + OCFS2_XATTR_SIZE(name_len), 0, 3938 size - OCFS2_XATTR_SIZE(name_len)); 3939 if (OCFS2_XATTR_SIZE(xi->value_len) > 0) 3940 memcpy(val + OCFS2_XATTR_SIZE(name_len), 3941 xi->value, xi->value_len); 3942 3943 le16_add_cpu(&xh->xh_name_value_len, new_size); 3944 ocfs2_xattr_set_local(xe, local); 3945 return; 3946 } else { 3947 /* Remove the old entry. */ 3948 last -= 1; 3949 memmove(xe, xe + 1, 3950 (void *)last - (void *)xe); 3951 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 3952 le16_add_cpu(&xh->xh_count, -1); 3953 if (xh->xh_count == 0 && is_empty) 3954 *is_empty = 1; 3955 return; 3956 } 3957 } else { 3958 /* find a new entry for insert. */ 3959 int low = 0, high = count - 1, tmp; 3960 struct ocfs2_xattr_entry *tmp_xe; 3961 3962 while (low <= high) { 3963 tmp = (low + high) / 2; 3964 tmp_xe = &xh->xh_entries[tmp]; 3965 3966 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash)) 3967 low = tmp + 1; 3968 else if (name_hash < 3969 le32_to_cpu(tmp_xe->xe_name_hash)) 3970 high = tmp - 1; 3971 else 3972 break; 3973 } 3974 3975 xe = &xh->xh_entries[low]; 3976 if (low != count) 3977 memmove(xe + 1, xe, (void *)last - (void *)xe); 3978 3979 le16_add_cpu(&xh->xh_count, 1); 3980 memset(xe, 0, sizeof(struct ocfs2_xattr_entry)); 3981 xe->xe_name_hash = cpu_to_le32(name_hash); 3982 xe->xe_name_len = name_len; 3983 ocfs2_xattr_set_type(xe, xi->name_index); 3984 } 3985 3986 set_new_name_value: 3987 /* Insert the new name+value. */ 3988 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len); 3989 3990 /* 3991 * We must make sure that the name/value pair 3992 * exists in the same block. 3993 */ 3994 offs = le16_to_cpu(xh->xh_free_start); 3995 start = offs - size; 3996 3997 if (start >> inode->i_sb->s_blocksize_bits != 3998 (offs - 1) >> inode->i_sb->s_blocksize_bits) { 3999 offs = offs - offs % blocksize; 4000 xh->xh_free_start = cpu_to_le16(offs); 4001 } 4002 4003 val = ocfs2_xattr_bucket_get_val(inode, 4004 &xs->bucket, offs - size); 4005 xe->xe_name_offset = cpu_to_le16(offs - size); 4006 4007 memset(val, 0, size); 4008 memcpy(val, xi->name, name_len); 4009 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); 4010 4011 xe->xe_value_size = cpu_to_le64(xi->value_len); 4012 ocfs2_xattr_set_local(xe, local); 4013 xs->here = xe; 4014 le16_add_cpu(&xh->xh_free_start, -size); 4015 le16_add_cpu(&xh->xh_name_value_len, size); 4016 4017 return; 4018 } 4019 4020 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode, 4021 handle_t *handle, 4022 struct ocfs2_xattr_search *xs, 4023 struct buffer_head **bhs, 4024 u16 bh_num) 4025 { 4026 int ret = 0, off, block_off; 4027 struct ocfs2_xattr_entry *xe = xs->here; 4028 4029 /* 4030 * First calculate all the blocks we should journal_access 4031 * and journal_dirty. The first block should always be touched. 4032 */ 4033 ret = ocfs2_journal_dirty(handle, bhs[0]); 4034 if (ret) 4035 mlog_errno(ret); 4036 4037 /* calc the data. */ 4038 off = le16_to_cpu(xe->xe_name_offset); 4039 block_off = off >> inode->i_sb->s_blocksize_bits; 4040 ret = ocfs2_journal_dirty(handle, bhs[block_off]); 4041 if (ret) 4042 mlog_errno(ret); 4043 4044 return ret; 4045 } 4046 4047 /* 4048 * Set the xattr entry in the specified bucket. 4049 * The bucket is indicated by xs->bucket and it should have the enough 4050 * space for the xattr insertion. 4051 */ 4052 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode, 4053 struct ocfs2_xattr_info *xi, 4054 struct ocfs2_xattr_search *xs, 4055 u32 name_hash, 4056 int local, 4057 int *bucket_empty) 4058 { 4059 int i, ret; 4060 handle_t *handle = NULL; 4061 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4062 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4063 4064 mlog(0, "Set xattr entry len = %d index = %d in bucket %llu\n", 4065 xi->value_len, xi->name_index, 4066 (unsigned long long)xs->bucket.bhs[0]->b_blocknr); 4067 4068 if (!xs->bucket.bhs[1]) { 4069 ret = ocfs2_read_blocks(osb, 4070 xs->bucket.bhs[0]->b_blocknr + 1, 4071 blk_per_bucket - 1, &xs->bucket.bhs[1], 4072 OCFS2_BH_CACHED, inode); 4073 if (ret) { 4074 mlog_errno(ret); 4075 goto out; 4076 } 4077 } 4078 4079 handle = ocfs2_start_trans(osb, blk_per_bucket); 4080 if (IS_ERR(handle)) { 4081 ret = PTR_ERR(handle); 4082 handle = NULL; 4083 mlog_errno(ret); 4084 goto out; 4085 } 4086 4087 for (i = 0; i < blk_per_bucket; i++) { 4088 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i], 4089 OCFS2_JOURNAL_ACCESS_WRITE); 4090 if (ret < 0) { 4091 mlog_errno(ret); 4092 goto out; 4093 } 4094 } 4095 4096 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, 4097 local, bucket_empty); 4098 4099 /*Only dirty the blocks we have touched in set xattr. */ 4100 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs, 4101 xs->bucket.bhs, blk_per_bucket); 4102 if (ret) 4103 mlog_errno(ret); 4104 out: 4105 ocfs2_commit_trans(osb, handle); 4106 4107 return ret; 4108 } 4109 4110 static int ocfs2_xattr_value_update_size(struct inode *inode, 4111 struct buffer_head *xe_bh, 4112 struct ocfs2_xattr_entry *xe, 4113 u64 new_size) 4114 { 4115 int ret; 4116 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4117 handle_t *handle = NULL; 4118 4119 handle = ocfs2_start_trans(osb, 1); 4120 if (handle == NULL) { 4121 ret = -ENOMEM; 4122 mlog_errno(ret); 4123 goto out; 4124 } 4125 4126 ret = ocfs2_journal_access(handle, inode, xe_bh, 4127 OCFS2_JOURNAL_ACCESS_WRITE); 4128 if (ret < 0) { 4129 mlog_errno(ret); 4130 goto out_commit; 4131 } 4132 4133 xe->xe_value_size = cpu_to_le64(new_size); 4134 4135 ret = ocfs2_journal_dirty(handle, xe_bh); 4136 if (ret < 0) 4137 mlog_errno(ret); 4138 4139 out_commit: 4140 ocfs2_commit_trans(osb, handle); 4141 out: 4142 return ret; 4143 } 4144 4145 /* 4146 * Truncate the specified xe_off entry in xattr bucket. 4147 * bucket is indicated by header_bh and len is the new length. 4148 * Both the ocfs2_xattr_value_root and the entry will be updated here. 4149 * 4150 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed. 4151 */ 4152 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode, 4153 struct buffer_head *header_bh, 4154 int xe_off, 4155 int len) 4156 { 4157 int ret, offset; 4158 u64 value_blk; 4159 struct buffer_head *value_bh = NULL; 4160 struct ocfs2_xattr_value_root *xv; 4161 struct ocfs2_xattr_entry *xe; 4162 struct ocfs2_xattr_header *xh = 4163 (struct ocfs2_xattr_header *)header_bh->b_data; 4164 size_t blocksize = inode->i_sb->s_blocksize; 4165 4166 xe = &xh->xh_entries[xe_off]; 4167 4168 BUG_ON(!xe || ocfs2_xattr_is_local(xe)); 4169 4170 offset = le16_to_cpu(xe->xe_name_offset) + 4171 OCFS2_XATTR_SIZE(xe->xe_name_len); 4172 4173 value_blk = offset / blocksize; 4174 4175 /* We don't allow ocfs2_xattr_value to be stored in different block. */ 4176 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize); 4177 value_blk += header_bh->b_blocknr; 4178 4179 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk, 4180 &value_bh, OCFS2_BH_CACHED, inode); 4181 if (ret) { 4182 mlog_errno(ret); 4183 goto out; 4184 } 4185 4186 xv = (struct ocfs2_xattr_value_root *) 4187 (value_bh->b_data + offset % blocksize); 4188 4189 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n", 4190 xe_off, (unsigned long long)header_bh->b_blocknr, len); 4191 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len); 4192 if (ret) { 4193 mlog_errno(ret); 4194 goto out; 4195 } 4196 4197 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len); 4198 if (ret) { 4199 mlog_errno(ret); 4200 goto out; 4201 } 4202 4203 out: 4204 brelse(value_bh); 4205 return ret; 4206 } 4207 4208 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode, 4209 struct ocfs2_xattr_search *xs, 4210 int len) 4211 { 4212 int ret, offset; 4213 struct ocfs2_xattr_entry *xe = xs->here; 4214 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base; 4215 4216 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe)); 4217 4218 offset = xe - xh->xh_entries; 4219 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0], 4220 offset, len); 4221 if (ret) 4222 mlog_errno(ret); 4223 4224 return ret; 4225 } 4226 4227 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode, 4228 struct ocfs2_xattr_search *xs, 4229 char *val, 4230 int value_len) 4231 { 4232 int offset; 4233 struct ocfs2_xattr_value_root *xv; 4234 struct ocfs2_xattr_entry *xe = xs->here; 4235 4236 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe)); 4237 4238 offset = le16_to_cpu(xe->xe_name_offset) + 4239 OCFS2_XATTR_SIZE(xe->xe_name_len); 4240 4241 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset); 4242 4243 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len); 4244 } 4245 4246 /* 4247 * Remove the xattr bucket pointed by bucket_bh. 4248 * All the buckets after it in the same xattr extent rec will be 4249 * move forward one by one. 4250 */ 4251 static int ocfs2_rm_xattr_bucket(struct inode *inode, 4252 struct buffer_head *first_bh, 4253 struct ocfs2_xattr_bucket *bucket) 4254 { 4255 int ret = 0, credits; 4256 struct ocfs2_xattr_header *xh = 4257 (struct ocfs2_xattr_header *)first_bh->b_data; 4258 u16 bucket_num = le16_to_cpu(xh->xh_num_buckets); 4259 u64 end, start = bucket->bhs[0]->b_blocknr; 4260 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4261 handle_t *handle; 4262 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4263 4264 end = first_bh->b_blocknr + (bucket_num - 1) * blk_per_bucket; 4265 4266 mlog(0, "rm xattr bucket %llu\n", start); 4267 /* 4268 * We need to update the first xattr_header and all the buckets starting 4269 * from start in this xattr rec. 4270 * 4271 * XXX: Should we empty the old last bucket here? 4272 */ 4273 credits = 1 + end - start; 4274 handle = ocfs2_start_trans(osb, credits); 4275 if (IS_ERR(handle)) { 4276 ret = PTR_ERR(handle); 4277 mlog_errno(ret); 4278 return ret; 4279 } 4280 4281 ret = ocfs2_journal_access(handle, inode, first_bh, 4282 OCFS2_JOURNAL_ACCESS_WRITE); 4283 if (ret) { 4284 mlog_errno(ret); 4285 goto out_commit; 4286 } 4287 4288 4289 while (start < end) { 4290 ret = ocfs2_cp_xattr_bucket(inode, handle, 4291 start + blk_per_bucket, 4292 start, 0); 4293 if (ret) { 4294 mlog_errno(ret); 4295 goto out_commit; 4296 } 4297 start += blk_per_bucket; 4298 } 4299 4300 /* update the first_bh. */ 4301 xh->xh_num_buckets = cpu_to_le16(bucket_num - 1); 4302 ocfs2_journal_dirty(handle, first_bh); 4303 4304 out_commit: 4305 ocfs2_commit_trans(osb, handle); 4306 return ret; 4307 } 4308 4309 static int ocfs2_rm_xattr_cluster(struct inode *inode, 4310 struct buffer_head *root_bh, 4311 u64 blkno, 4312 u32 cpos, 4313 u32 len) 4314 { 4315 int ret; 4316 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4317 struct inode *tl_inode = osb->osb_tl_inode; 4318 handle_t *handle; 4319 struct ocfs2_xattr_block *xb = 4320 (struct ocfs2_xattr_block *)root_bh->b_data; 4321 struct ocfs2_extent_list *root_el = &xb->xb_attrs.xb_root.xt_list; 4322 struct ocfs2_alloc_context *meta_ac = NULL; 4323 struct ocfs2_cached_dealloc_ctxt dealloc; 4324 4325 ocfs2_init_dealloc_ctxt(&dealloc); 4326 4327 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n", 4328 cpos, len, (unsigned long long)blkno); 4329 4330 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len); 4331 4332 ret = ocfs2_lock_allocators(inode, root_bh, root_el, 4333 0, 1, NULL, &meta_ac, 4334 OCFS2_XATTR_TREE_EXTENT, NULL); 4335 if (ret) { 4336 mlog_errno(ret); 4337 return ret; 4338 } 4339 4340 mutex_lock(&tl_inode->i_mutex); 4341 4342 if (ocfs2_truncate_log_needs_flush(osb)) { 4343 ret = __ocfs2_flush_truncate_log(osb); 4344 if (ret < 0) { 4345 mlog_errno(ret); 4346 goto out; 4347 } 4348 } 4349 4350 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 4351 if (handle == NULL) { 4352 ret = -ENOMEM; 4353 mlog_errno(ret); 4354 goto out; 4355 } 4356 4357 ret = ocfs2_journal_access(handle, inode, root_bh, 4358 OCFS2_JOURNAL_ACCESS_WRITE); 4359 if (ret) { 4360 mlog_errno(ret); 4361 goto out_commit; 4362 } 4363 4364 ret = ocfs2_remove_extent(inode, root_bh, cpos, len, handle, meta_ac, 4365 &dealloc, OCFS2_XATTR_TREE_EXTENT, NULL); 4366 if (ret) { 4367 mlog_errno(ret); 4368 goto out_commit; 4369 } 4370 4371 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len); 4372 4373 ret = ocfs2_journal_dirty(handle, root_bh); 4374 if (ret) { 4375 mlog_errno(ret); 4376 goto out_commit; 4377 } 4378 4379 ret = ocfs2_truncate_log_append(osb, handle, blkno, len); 4380 if (ret) 4381 mlog_errno(ret); 4382 4383 out_commit: 4384 ocfs2_commit_trans(osb, handle); 4385 out: 4386 ocfs2_schedule_truncate_log_flush(osb, 1); 4387 4388 mutex_unlock(&tl_inode->i_mutex); 4389 4390 if (meta_ac) 4391 ocfs2_free_alloc_context(meta_ac); 4392 4393 ocfs2_run_deallocs(osb, &dealloc); 4394 4395 return ret; 4396 } 4397 4398 /* 4399 * Free the xattr bucket indicated by xs->bucket and if all the buckets 4400 * in the clusters is free, free the clusters also. 4401 */ 4402 static int ocfs2_xattr_bucket_shrink(struct inode *inode, 4403 struct ocfs2_xattr_info *xi, 4404 struct ocfs2_xattr_search *xs, 4405 u32 name_hash) 4406 { 4407 int ret; 4408 u32 e_cpos, num_clusters; 4409 u64 p_blkno; 4410 struct buffer_head *first_bh = NULL; 4411 struct ocfs2_xattr_header *first_xh; 4412 struct ocfs2_xattr_block *xb = 4413 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 4414 4415 BUG_ON(xs->header->xh_count != 0); 4416 4417 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4418 &e_cpos, &num_clusters, 4419 &xb->xb_attrs.xb_root.xt_list); 4420 if (ret) { 4421 mlog_errno(ret); 4422 return ret; 4423 } 4424 4425 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, 4426 &first_bh, OCFS2_BH_CACHED, inode); 4427 if (ret) { 4428 mlog_errno(ret); 4429 return ret; 4430 } 4431 4432 ret = ocfs2_rm_xattr_bucket(inode, first_bh, &xs->bucket); 4433 if (ret) { 4434 mlog_errno(ret); 4435 goto out; 4436 } 4437 4438 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 4439 if (first_xh->xh_num_buckets == 0) 4440 ret = ocfs2_rm_xattr_cluster(inode, xs->xattr_bh, 4441 p_blkno, e_cpos, 4442 num_clusters); 4443 4444 out: 4445 brelse(first_bh); 4446 return ret; 4447 } 4448 4449 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode, 4450 struct ocfs2_xattr_search *xs) 4451 { 4452 handle_t *handle = NULL; 4453 struct ocfs2_xattr_header *xh = xs->bucket.xh; 4454 struct ocfs2_xattr_entry *last = &xh->xh_entries[ 4455 le16_to_cpu(xh->xh_count) - 1]; 4456 int ret = 0; 4457 4458 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1); 4459 if (IS_ERR(handle)) { 4460 ret = PTR_ERR(handle); 4461 mlog_errno(ret); 4462 return; 4463 } 4464 4465 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0], 4466 OCFS2_JOURNAL_ACCESS_WRITE); 4467 if (ret) { 4468 mlog_errno(ret); 4469 goto out_commit; 4470 } 4471 4472 /* Remove the old entry. */ 4473 memmove(xs->here, xs->here + 1, 4474 (void *)last - (void *)xs->here); 4475 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 4476 le16_add_cpu(&xh->xh_count, -1); 4477 4478 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]); 4479 if (ret < 0) 4480 mlog_errno(ret); 4481 out_commit: 4482 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 4483 } 4484 4485 /* 4486 * Set the xattr name/value in the bucket specified in xs. 4487 * 4488 * As the new value in xi may be stored in the bucket or in an outside cluster, 4489 * we divide the whole process into 3 steps: 4490 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket) 4491 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs) 4492 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside) 4493 * 4. If the clusters for the new outside value can't be allocated, we need 4494 * to free the xattr we allocated in set. 4495 */ 4496 static int ocfs2_xattr_set_in_bucket(struct inode *inode, 4497 struct ocfs2_xattr_info *xi, 4498 struct ocfs2_xattr_search *xs) 4499 { 4500 int ret, local = 1, bucket_empty = 0; 4501 size_t value_len; 4502 char *val = (char *)xi->value; 4503 struct ocfs2_xattr_entry *xe = xs->here; 4504 u32 name_hash = ocfs2_xattr_hash_by_name(inode, 4505 xi->name_index, xi->name); 4506 4507 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) { 4508 /* 4509 * We need to truncate the xattr storage first. 4510 * 4511 * If both the old and new value are stored to 4512 * outside block, we only need to truncate 4513 * the storage and then set the value outside. 4514 * 4515 * If the new value should be stored within block, 4516 * we should free all the outside block first and 4517 * the modification to the xattr block will be done 4518 * by following steps. 4519 */ 4520 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4521 value_len = xi->value_len; 4522 else 4523 value_len = 0; 4524 4525 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4526 value_len); 4527 if (ret) 4528 goto out; 4529 4530 if (value_len) 4531 goto set_value_outside; 4532 } 4533 4534 value_len = xi->value_len; 4535 /* So we have to handle the inside block change now. */ 4536 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4537 /* 4538 * If the new value will be stored outside of block, 4539 * initalize a new empty value root and insert it first. 4540 */ 4541 local = 0; 4542 xi->value = &def_xv; 4543 xi->value_len = OCFS2_XATTR_ROOT_SIZE; 4544 } 4545 4546 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, 4547 local, &bucket_empty); 4548 if (ret) { 4549 mlog_errno(ret); 4550 goto out; 4551 } 4552 4553 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4554 /* allocate the space now for the outside block storage. */ 4555 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4556 value_len); 4557 if (ret) { 4558 mlog_errno(ret); 4559 4560 if (xs->not_found) { 4561 /* 4562 * We can't allocate enough clusters for outside 4563 * storage and we have allocated xattr already, 4564 * so need to remove it. 4565 */ 4566 ocfs2_xattr_bucket_remove_xs(inode, xs); 4567 } 4568 goto out; 4569 } 4570 } else { 4571 if (bucket_empty) 4572 ret = ocfs2_xattr_bucket_shrink(inode, xi, 4573 xs, name_hash); 4574 goto out; 4575 } 4576 4577 set_value_outside: 4578 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len); 4579 out: 4580 return ret; 4581 } 4582 4583 /* check whether the xattr bucket is filled up with the same hash value. */ 4584 static int ocfs2_check_xattr_bucket_collision(struct inode *inode, 4585 struct ocfs2_xattr_bucket *bucket) 4586 { 4587 struct ocfs2_xattr_header *xh = bucket->xh; 4588 4589 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash == 4590 xh->xh_entries[0].xe_name_hash) { 4591 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, " 4592 "hash = %u\n", 4593 (unsigned long long)bucket->bhs[0]->b_blocknr, 4594 le32_to_cpu(xh->xh_entries[0].xe_name_hash)); 4595 return -ENOSPC; 4596 } 4597 4598 return 0; 4599 } 4600 4601 static int ocfs2_xattr_set_entry_index_block(struct inode *inode, 4602 struct ocfs2_xattr_info *xi, 4603 struct ocfs2_xattr_search *xs) 4604 { 4605 struct ocfs2_xattr_header *xh; 4606 struct ocfs2_xattr_entry *xe; 4607 u16 count, header_size, xh_free_start; 4608 int i, free, max_free, need, old; 4609 size_t value_size = 0, name_len = strlen(xi->name); 4610 size_t blocksize = inode->i_sb->s_blocksize; 4611 int ret, allocation = 0; 4612 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4613 4614 mlog_entry("Set xattr %s in xattr index block\n", xi->name); 4615 4616 try_again: 4617 xh = xs->header; 4618 count = le16_to_cpu(xh->xh_count); 4619 xh_free_start = le16_to_cpu(xh->xh_free_start); 4620 header_size = sizeof(struct ocfs2_xattr_header) + 4621 count * sizeof(struct ocfs2_xattr_entry); 4622 max_free = OCFS2_XATTR_BUCKET_SIZE - 4623 le16_to_cpu(xh->xh_name_value_len) - header_size; 4624 4625 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size " 4626 "of %u which exceed block size\n", 4627 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4628 header_size); 4629 4630 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4631 value_size = OCFS2_XATTR_ROOT_SIZE; 4632 else if (xi->value) 4633 value_size = OCFS2_XATTR_SIZE(xi->value_len); 4634 4635 if (xs->not_found) 4636 need = sizeof(struct ocfs2_xattr_entry) + 4637 OCFS2_XATTR_SIZE(name_len) + value_size; 4638 else { 4639 need = value_size + OCFS2_XATTR_SIZE(name_len); 4640 4641 /* 4642 * We only replace the old value if the new length is smaller 4643 * than the old one. Otherwise we will allocate new space in the 4644 * bucket to store it. 4645 */ 4646 xe = xs->here; 4647 if (ocfs2_xattr_is_local(xe)) 4648 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 4649 else 4650 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 4651 4652 if (old >= value_size) 4653 need = 0; 4654 } 4655 4656 free = xh_free_start - header_size; 4657 /* 4658 * We need to make sure the new name/value pair 4659 * can exist in the same block. 4660 */ 4661 if (xh_free_start % blocksize < need) 4662 free -= xh_free_start % blocksize; 4663 4664 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, " 4665 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len =" 4666 " %u\n", xs->not_found, 4667 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4668 free, need, max_free, le16_to_cpu(xh->xh_free_start), 4669 le16_to_cpu(xh->xh_name_value_len)); 4670 4671 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4672 if (need <= max_free && 4673 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4674 /* 4675 * We can create the space by defragment. Since only the 4676 * name/value will be moved, the xe shouldn't be changed 4677 * in xs. 4678 */ 4679 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket); 4680 if (ret) { 4681 mlog_errno(ret); 4682 goto out; 4683 } 4684 4685 xh_free_start = le16_to_cpu(xh->xh_free_start); 4686 free = xh_free_start - header_size; 4687 if (xh_free_start % blocksize < need) 4688 free -= xh_free_start % blocksize; 4689 4690 if (free >= need) 4691 goto xattr_set; 4692 4693 mlog(0, "Can't get enough space for xattr insert by " 4694 "defragment. Need %u bytes, but we have %d, so " 4695 "allocate new bucket for it.\n", need, free); 4696 } 4697 4698 /* 4699 * We have to add new buckets or clusters and one 4700 * allocation should leave us enough space for insert. 4701 */ 4702 BUG_ON(allocation); 4703 4704 /* 4705 * We do not allow for overlapping ranges between buckets. And 4706 * the maximum number of collisions we will allow for then is 4707 * one bucket's worth, so check it here whether we need to 4708 * add a new bucket for the insert. 4709 */ 4710 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket); 4711 if (ret) { 4712 mlog_errno(ret); 4713 goto out; 4714 } 4715 4716 ret = ocfs2_add_new_xattr_bucket(inode, 4717 xs->xattr_bh, 4718 xs->bucket.bhs[0]); 4719 if (ret) { 4720 mlog_errno(ret); 4721 goto out; 4722 } 4723 4724 for (i = 0; i < blk_per_bucket; i++) 4725 brelse(xs->bucket.bhs[i]); 4726 4727 memset(&xs->bucket, 0, sizeof(xs->bucket)); 4728 4729 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh, 4730 xi->name_index, 4731 xi->name, xs); 4732 if (ret && ret != -ENODATA) 4733 goto out; 4734 xs->not_found = ret; 4735 allocation = 1; 4736 goto try_again; 4737 } 4738 4739 xattr_set: 4740 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs); 4741 out: 4742 mlog_exit(ret); 4743 return ret; 4744 } 4745 4746 static int ocfs2_delete_xattr_in_bucket(struct inode *inode, 4747 struct ocfs2_xattr_bucket *bucket, 4748 void *para) 4749 { 4750 int ret = 0; 4751 struct ocfs2_xattr_header *xh = bucket->xh; 4752 u16 i; 4753 struct ocfs2_xattr_entry *xe; 4754 4755 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 4756 xe = &xh->xh_entries[i]; 4757 if (ocfs2_xattr_is_local(xe)) 4758 continue; 4759 4760 ret = ocfs2_xattr_bucket_value_truncate(inode, 4761 bucket->bhs[0], 4762 i, 0); 4763 if (ret) { 4764 mlog_errno(ret); 4765 break; 4766 } 4767 } 4768 4769 return ret; 4770 } 4771 4772 static int ocfs2_delete_xattr_index_block(struct inode *inode, 4773 struct buffer_head *xb_bh) 4774 { 4775 struct ocfs2_xattr_block *xb = 4776 (struct ocfs2_xattr_block *)xb_bh->b_data; 4777 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 4778 int ret = 0; 4779 u32 name_hash = UINT_MAX, e_cpos, num_clusters; 4780 u64 p_blkno; 4781 4782 if (le16_to_cpu(el->l_next_free_rec) == 0) 4783 return 0; 4784 4785 while (name_hash > 0) { 4786 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4787 &e_cpos, &num_clusters, el); 4788 if (ret) { 4789 mlog_errno(ret); 4790 goto out; 4791 } 4792 4793 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 4794 ocfs2_delete_xattr_in_bucket, 4795 NULL); 4796 if (ret) { 4797 mlog_errno(ret); 4798 goto out; 4799 } 4800 4801 ret = ocfs2_rm_xattr_cluster(inode, xb_bh, 4802 p_blkno, e_cpos, num_clusters); 4803 if (ret) { 4804 mlog_errno(ret); 4805 break; 4806 } 4807 4808 if (e_cpos == 0) 4809 break; 4810 4811 name_hash = e_cpos - 1; 4812 } 4813 4814 out: 4815 return ret; 4816 } 4817