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 #include <linux/init.h> 41 #include <linux/module.h> 42 #include <linux/string.h> 43 44 #define MLOG_MASK_PREFIX ML_XATTR 45 #include <cluster/masklog.h> 46 47 #include "ocfs2.h" 48 #include "alloc.h" 49 #include "dlmglue.h" 50 #include "file.h" 51 #include "symlink.h" 52 #include "sysfile.h" 53 #include "inode.h" 54 #include "journal.h" 55 #include "ocfs2_fs.h" 56 #include "suballoc.h" 57 #include "uptodate.h" 58 #include "buffer_head_io.h" 59 #include "super.h" 60 #include "xattr.h" 61 62 63 struct ocfs2_xattr_def_value_root { 64 struct ocfs2_xattr_value_root xv; 65 struct ocfs2_extent_rec er; 66 }; 67 68 struct ocfs2_xattr_bucket { 69 struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET]; 70 struct ocfs2_xattr_header *xh; 71 }; 72 73 #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root)) 74 #define OCFS2_XATTR_INLINE_SIZE 80 75 76 static struct ocfs2_xattr_def_value_root def_xv = { 77 .xv.xr_list.l_count = cpu_to_le16(1), 78 }; 79 80 struct xattr_handler *ocfs2_xattr_handlers[] = { 81 &ocfs2_xattr_user_handler, 82 &ocfs2_xattr_trusted_handler, 83 NULL 84 }; 85 86 static struct xattr_handler *ocfs2_xattr_handler_map[] = { 87 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler, 88 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler, 89 }; 90 91 struct ocfs2_xattr_info { 92 int name_index; 93 const char *name; 94 const void *value; 95 size_t value_len; 96 }; 97 98 struct ocfs2_xattr_search { 99 struct buffer_head *inode_bh; 100 /* 101 * xattr_bh point to the block buffer head which has extended attribute 102 * when extended attribute in inode, xattr_bh is equal to inode_bh. 103 */ 104 struct buffer_head *xattr_bh; 105 struct ocfs2_xattr_header *header; 106 struct ocfs2_xattr_bucket bucket; 107 void *base; 108 void *end; 109 struct ocfs2_xattr_entry *here; 110 int not_found; 111 }; 112 113 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, 114 struct ocfs2_xattr_header *xh, 115 int index, 116 int *block_off, 117 int *new_offset); 118 119 static int ocfs2_xattr_index_block_find(struct inode *inode, 120 struct buffer_head *root_bh, 121 int name_index, 122 const char *name, 123 struct ocfs2_xattr_search *xs); 124 125 static int ocfs2_xattr_tree_list_index_block(struct inode *inode, 126 struct ocfs2_xattr_tree_root *xt, 127 char *buffer, 128 size_t buffer_size); 129 130 static int ocfs2_xattr_create_index_block(struct inode *inode, 131 struct ocfs2_xattr_search *xs); 132 133 static int ocfs2_xattr_set_entry_index_block(struct inode *inode, 134 struct ocfs2_xattr_info *xi, 135 struct ocfs2_xattr_search *xs); 136 137 static int ocfs2_delete_xattr_index_block(struct inode *inode, 138 struct buffer_head *xb_bh); 139 140 static inline struct xattr_handler *ocfs2_xattr_handler(int name_index) 141 { 142 struct xattr_handler *handler = NULL; 143 144 if (name_index > 0 && name_index < OCFS2_XATTR_MAX) 145 handler = ocfs2_xattr_handler_map[name_index]; 146 147 return handler; 148 } 149 150 static u32 ocfs2_xattr_name_hash(struct inode *inode, 151 char *prefix, 152 int prefix_len, 153 char *name, 154 int name_len) 155 { 156 /* Get hash value of uuid from super block */ 157 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash; 158 int i; 159 160 /* hash extended attribute prefix */ 161 for (i = 0; i < prefix_len; i++) { 162 hash = (hash << OCFS2_HASH_SHIFT) ^ 163 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^ 164 *prefix++; 165 } 166 /* hash extended attribute name */ 167 for (i = 0; i < name_len; i++) { 168 hash = (hash << OCFS2_HASH_SHIFT) ^ 169 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^ 170 *name++; 171 } 172 173 return hash; 174 } 175 176 /* 177 * ocfs2_xattr_hash_entry() 178 * 179 * Compute the hash of an extended attribute. 180 */ 181 static void ocfs2_xattr_hash_entry(struct inode *inode, 182 struct ocfs2_xattr_header *header, 183 struct ocfs2_xattr_entry *entry) 184 { 185 u32 hash = 0; 186 struct xattr_handler *handler = 187 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); 188 char *prefix = handler->prefix; 189 char *name = (char *)header + le16_to_cpu(entry->xe_name_offset); 190 int prefix_len = strlen(handler->prefix); 191 192 hash = ocfs2_xattr_name_hash(inode, prefix, prefix_len, name, 193 entry->xe_name_len); 194 entry->xe_name_hash = cpu_to_le32(hash); 195 196 return; 197 } 198 199 static int ocfs2_xattr_extend_allocation(struct inode *inode, 200 u32 clusters_to_add, 201 struct buffer_head *xattr_bh, 202 struct ocfs2_xattr_value_root *xv) 203 { 204 int status = 0; 205 int restart_func = 0; 206 int credits = 0; 207 handle_t *handle = NULL; 208 struct ocfs2_alloc_context *data_ac = NULL; 209 struct ocfs2_alloc_context *meta_ac = NULL; 210 enum ocfs2_alloc_restarted why; 211 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 212 u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters); 213 struct ocfs2_extent_tree et; 214 215 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add); 216 217 ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv); 218 219 restart_all: 220 221 status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, 222 &data_ac, &meta_ac); 223 if (status) { 224 mlog_errno(status); 225 goto leave; 226 } 227 228 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el, 229 clusters_to_add); 230 handle = ocfs2_start_trans(osb, credits); 231 if (IS_ERR(handle)) { 232 status = PTR_ERR(handle); 233 handle = NULL; 234 mlog_errno(status); 235 goto leave; 236 } 237 238 restarted_transaction: 239 status = ocfs2_journal_access(handle, inode, xattr_bh, 240 OCFS2_JOURNAL_ACCESS_WRITE); 241 if (status < 0) { 242 mlog_errno(status); 243 goto leave; 244 } 245 246 prev_clusters = le32_to_cpu(xv->xr_clusters); 247 status = ocfs2_add_clusters_in_btree(osb, 248 inode, 249 &logical_start, 250 clusters_to_add, 251 0, 252 &et, 253 handle, 254 data_ac, 255 meta_ac, 256 &why); 257 if ((status < 0) && (status != -EAGAIN)) { 258 if (status != -ENOSPC) 259 mlog_errno(status); 260 goto leave; 261 } 262 263 status = ocfs2_journal_dirty(handle, xattr_bh); 264 if (status < 0) { 265 mlog_errno(status); 266 goto leave; 267 } 268 269 clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters; 270 271 if (why != RESTART_NONE && clusters_to_add) { 272 if (why == RESTART_META) { 273 mlog(0, "restarting function.\n"); 274 restart_func = 1; 275 } else { 276 BUG_ON(why != RESTART_TRANS); 277 278 mlog(0, "restarting transaction.\n"); 279 /* TODO: This can be more intelligent. */ 280 credits = ocfs2_calc_extend_credits(osb->sb, 281 et.et_root_el, 282 clusters_to_add); 283 status = ocfs2_extend_trans(handle, credits); 284 if (status < 0) { 285 /* handle still has to be committed at 286 * this point. */ 287 status = -ENOMEM; 288 mlog_errno(status); 289 goto leave; 290 } 291 goto restarted_transaction; 292 } 293 } 294 295 leave: 296 if (handle) { 297 ocfs2_commit_trans(osb, handle); 298 handle = NULL; 299 } 300 if (data_ac) { 301 ocfs2_free_alloc_context(data_ac); 302 data_ac = NULL; 303 } 304 if (meta_ac) { 305 ocfs2_free_alloc_context(meta_ac); 306 meta_ac = NULL; 307 } 308 if ((!status) && restart_func) { 309 restart_func = 0; 310 goto restart_all; 311 } 312 313 return status; 314 } 315 316 static int __ocfs2_remove_xattr_range(struct inode *inode, 317 struct buffer_head *root_bh, 318 struct ocfs2_xattr_value_root *xv, 319 u32 cpos, u32 phys_cpos, u32 len, 320 struct ocfs2_cached_dealloc_ctxt *dealloc) 321 { 322 int ret; 323 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); 324 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 325 struct inode *tl_inode = osb->osb_tl_inode; 326 handle_t *handle; 327 struct ocfs2_alloc_context *meta_ac = NULL; 328 struct ocfs2_extent_tree et; 329 330 ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv); 331 332 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac); 333 if (ret) { 334 mlog_errno(ret); 335 return ret; 336 } 337 338 mutex_lock(&tl_inode->i_mutex); 339 340 if (ocfs2_truncate_log_needs_flush(osb)) { 341 ret = __ocfs2_flush_truncate_log(osb); 342 if (ret < 0) { 343 mlog_errno(ret); 344 goto out; 345 } 346 } 347 348 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 349 if (IS_ERR(handle)) { 350 ret = PTR_ERR(handle); 351 mlog_errno(ret); 352 goto out; 353 } 354 355 ret = ocfs2_journal_access(handle, inode, root_bh, 356 OCFS2_JOURNAL_ACCESS_WRITE); 357 if (ret) { 358 mlog_errno(ret); 359 goto out_commit; 360 } 361 362 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac, 363 dealloc); 364 if (ret) { 365 mlog_errno(ret); 366 goto out_commit; 367 } 368 369 le32_add_cpu(&xv->xr_clusters, -len); 370 371 ret = ocfs2_journal_dirty(handle, root_bh); 372 if (ret) { 373 mlog_errno(ret); 374 goto out_commit; 375 } 376 377 ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len); 378 if (ret) 379 mlog_errno(ret); 380 381 out_commit: 382 ocfs2_commit_trans(osb, handle); 383 out: 384 mutex_unlock(&tl_inode->i_mutex); 385 386 if (meta_ac) 387 ocfs2_free_alloc_context(meta_ac); 388 389 return ret; 390 } 391 392 static int ocfs2_xattr_shrink_size(struct inode *inode, 393 u32 old_clusters, 394 u32 new_clusters, 395 struct buffer_head *root_bh, 396 struct ocfs2_xattr_value_root *xv) 397 { 398 int ret = 0; 399 u32 trunc_len, cpos, phys_cpos, alloc_size; 400 u64 block; 401 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 402 struct ocfs2_cached_dealloc_ctxt dealloc; 403 404 ocfs2_init_dealloc_ctxt(&dealloc); 405 406 if (old_clusters <= new_clusters) 407 return 0; 408 409 cpos = new_clusters; 410 trunc_len = old_clusters - new_clusters; 411 while (trunc_len) { 412 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos, 413 &alloc_size, &xv->xr_list); 414 if (ret) { 415 mlog_errno(ret); 416 goto out; 417 } 418 419 if (alloc_size > trunc_len) 420 alloc_size = trunc_len; 421 422 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos, 423 phys_cpos, alloc_size, 424 &dealloc); 425 if (ret) { 426 mlog_errno(ret); 427 goto out; 428 } 429 430 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); 431 ocfs2_remove_xattr_clusters_from_cache(inode, block, 432 alloc_size); 433 cpos += alloc_size; 434 trunc_len -= alloc_size; 435 } 436 437 out: 438 ocfs2_schedule_truncate_log_flush(osb, 1); 439 ocfs2_run_deallocs(osb, &dealloc); 440 441 return ret; 442 } 443 444 static int ocfs2_xattr_value_truncate(struct inode *inode, 445 struct buffer_head *root_bh, 446 struct ocfs2_xattr_value_root *xv, 447 int len) 448 { 449 int ret; 450 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len); 451 u32 old_clusters = le32_to_cpu(xv->xr_clusters); 452 453 if (new_clusters == old_clusters) 454 return 0; 455 456 if (new_clusters > old_clusters) 457 ret = ocfs2_xattr_extend_allocation(inode, 458 new_clusters - old_clusters, 459 root_bh, xv); 460 else 461 ret = ocfs2_xattr_shrink_size(inode, 462 old_clusters, new_clusters, 463 root_bh, xv); 464 465 return ret; 466 } 467 468 static int ocfs2_xattr_list_entries(struct inode *inode, 469 struct ocfs2_xattr_header *header, 470 char *buffer, size_t buffer_size) 471 { 472 size_t rest = buffer_size; 473 int i; 474 475 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) { 476 struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; 477 struct xattr_handler *handler = 478 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); 479 480 if (handler) { 481 size_t size = handler->list(inode, buffer, rest, 482 ((char *)header + 483 le16_to_cpu(entry->xe_name_offset)), 484 entry->xe_name_len); 485 if (buffer) { 486 if (size > rest) 487 return -ERANGE; 488 buffer += size; 489 } 490 rest -= size; 491 } 492 } 493 494 return buffer_size - rest; 495 } 496 497 static int ocfs2_xattr_ibody_list(struct inode *inode, 498 struct ocfs2_dinode *di, 499 char *buffer, 500 size_t buffer_size) 501 { 502 struct ocfs2_xattr_header *header = NULL; 503 struct ocfs2_inode_info *oi = OCFS2_I(inode); 504 int ret = 0; 505 506 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) 507 return ret; 508 509 header = (struct ocfs2_xattr_header *) 510 ((void *)di + inode->i_sb->s_blocksize - 511 le16_to_cpu(di->i_xattr_inline_size)); 512 513 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size); 514 515 return ret; 516 } 517 518 static int ocfs2_xattr_block_list(struct inode *inode, 519 struct ocfs2_dinode *di, 520 char *buffer, 521 size_t buffer_size) 522 { 523 struct buffer_head *blk_bh = NULL; 524 struct ocfs2_xattr_block *xb; 525 int ret = 0; 526 527 if (!di->i_xattr_loc) 528 return ret; 529 530 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 531 le64_to_cpu(di->i_xattr_loc), 532 &blk_bh, OCFS2_BH_CACHED, inode); 533 if (ret < 0) { 534 mlog_errno(ret); 535 return ret; 536 } 537 /*Verify the signature of xattr block*/ 538 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 539 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 540 ret = -EFAULT; 541 goto cleanup; 542 } 543 544 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 545 546 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 547 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header; 548 ret = ocfs2_xattr_list_entries(inode, header, 549 buffer, buffer_size); 550 } else { 551 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root; 552 ret = ocfs2_xattr_tree_list_index_block(inode, xt, 553 buffer, buffer_size); 554 } 555 cleanup: 556 brelse(blk_bh); 557 558 return ret; 559 } 560 561 ssize_t ocfs2_listxattr(struct dentry *dentry, 562 char *buffer, 563 size_t size) 564 { 565 int ret = 0, i_ret = 0, b_ret = 0; 566 struct buffer_head *di_bh = NULL; 567 struct ocfs2_dinode *di = NULL; 568 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode); 569 570 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb))) 571 return -EOPNOTSUPP; 572 573 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 574 return ret; 575 576 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0); 577 if (ret < 0) { 578 mlog_errno(ret); 579 return ret; 580 } 581 582 di = (struct ocfs2_dinode *)di_bh->b_data; 583 584 down_read(&oi->ip_xattr_sem); 585 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size); 586 if (i_ret < 0) 587 b_ret = 0; 588 else { 589 if (buffer) { 590 buffer += i_ret; 591 size -= i_ret; 592 } 593 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di, 594 buffer, size); 595 if (b_ret < 0) 596 i_ret = 0; 597 } 598 up_read(&oi->ip_xattr_sem); 599 ocfs2_inode_unlock(dentry->d_inode, 0); 600 601 brelse(di_bh); 602 603 return i_ret + b_ret; 604 } 605 606 static int ocfs2_xattr_find_entry(int name_index, 607 const char *name, 608 struct ocfs2_xattr_search *xs) 609 { 610 struct ocfs2_xattr_entry *entry; 611 size_t name_len; 612 int i, cmp = 1; 613 614 if (name == NULL) 615 return -EINVAL; 616 617 name_len = strlen(name); 618 entry = xs->here; 619 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) { 620 cmp = name_index - ocfs2_xattr_get_type(entry); 621 if (!cmp) 622 cmp = name_len - entry->xe_name_len; 623 if (!cmp) 624 cmp = memcmp(name, (xs->base + 625 le16_to_cpu(entry->xe_name_offset)), 626 name_len); 627 if (cmp == 0) 628 break; 629 entry += 1; 630 } 631 xs->here = entry; 632 633 return cmp ? -ENODATA : 0; 634 } 635 636 static int ocfs2_xattr_get_value_outside(struct inode *inode, 637 struct ocfs2_xattr_value_root *xv, 638 void *buffer, 639 size_t len) 640 { 641 u32 cpos, p_cluster, num_clusters, bpc, clusters; 642 u64 blkno; 643 int i, ret = 0; 644 size_t cplen, blocksize; 645 struct buffer_head *bh = NULL; 646 struct ocfs2_extent_list *el; 647 648 el = &xv->xr_list; 649 clusters = le32_to_cpu(xv->xr_clusters); 650 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 651 blocksize = inode->i_sb->s_blocksize; 652 653 cpos = 0; 654 while (cpos < clusters) { 655 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, 656 &num_clusters, el); 657 if (ret) { 658 mlog_errno(ret); 659 goto out; 660 } 661 662 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); 663 /* Copy ocfs2_xattr_value */ 664 for (i = 0; i < num_clusters * bpc; i++, blkno++) { 665 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 666 &bh, OCFS2_BH_CACHED, inode); 667 if (ret) { 668 mlog_errno(ret); 669 goto out; 670 } 671 672 cplen = len >= blocksize ? blocksize : len; 673 memcpy(buffer, bh->b_data, cplen); 674 len -= cplen; 675 buffer += cplen; 676 677 brelse(bh); 678 bh = NULL; 679 if (len == 0) 680 break; 681 } 682 cpos += num_clusters; 683 } 684 out: 685 return ret; 686 } 687 688 static int ocfs2_xattr_ibody_get(struct inode *inode, 689 int name_index, 690 const char *name, 691 void *buffer, 692 size_t buffer_size, 693 struct ocfs2_xattr_search *xs) 694 { 695 struct ocfs2_inode_info *oi = OCFS2_I(inode); 696 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 697 struct ocfs2_xattr_value_root *xv; 698 size_t size; 699 int ret = 0; 700 701 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) 702 return -ENODATA; 703 704 xs->end = (void *)di + inode->i_sb->s_blocksize; 705 xs->header = (struct ocfs2_xattr_header *) 706 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 707 xs->base = (void *)xs->header; 708 xs->here = xs->header->xh_entries; 709 710 ret = ocfs2_xattr_find_entry(name_index, name, xs); 711 if (ret) 712 return ret; 713 size = le64_to_cpu(xs->here->xe_value_size); 714 if (buffer) { 715 if (size > buffer_size) 716 return -ERANGE; 717 if (ocfs2_xattr_is_local(xs->here)) { 718 memcpy(buffer, (void *)xs->base + 719 le16_to_cpu(xs->here->xe_name_offset) + 720 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size); 721 } else { 722 xv = (struct ocfs2_xattr_value_root *) 723 (xs->base + le16_to_cpu( 724 xs->here->xe_name_offset) + 725 OCFS2_XATTR_SIZE(xs->here->xe_name_len)); 726 ret = ocfs2_xattr_get_value_outside(inode, xv, 727 buffer, size); 728 if (ret < 0) { 729 mlog_errno(ret); 730 return ret; 731 } 732 } 733 } 734 735 return size; 736 } 737 738 static int ocfs2_xattr_block_get(struct inode *inode, 739 int name_index, 740 const char *name, 741 void *buffer, 742 size_t buffer_size, 743 struct ocfs2_xattr_search *xs) 744 { 745 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 746 struct buffer_head *blk_bh = NULL; 747 struct ocfs2_xattr_block *xb; 748 struct ocfs2_xattr_value_root *xv; 749 size_t size; 750 int ret = -ENODATA, name_offset, name_len, block_off, i; 751 752 if (!di->i_xattr_loc) 753 return ret; 754 755 memset(&xs->bucket, 0, sizeof(xs->bucket)); 756 757 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 758 le64_to_cpu(di->i_xattr_loc), 759 &blk_bh, OCFS2_BH_CACHED, inode); 760 if (ret < 0) { 761 mlog_errno(ret); 762 return ret; 763 } 764 /*Verify the signature of xattr block*/ 765 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 766 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 767 ret = -EFAULT; 768 goto cleanup; 769 } 770 771 xs->xattr_bh = blk_bh; 772 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 773 774 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 775 xs->header = &xb->xb_attrs.xb_header; 776 xs->base = (void *)xs->header; 777 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 778 xs->here = xs->header->xh_entries; 779 780 ret = ocfs2_xattr_find_entry(name_index, name, xs); 781 } else 782 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 783 name_index, 784 name, xs); 785 786 if (ret) 787 goto cleanup; 788 size = le64_to_cpu(xs->here->xe_value_size); 789 if (buffer) { 790 ret = -ERANGE; 791 if (size > buffer_size) 792 goto cleanup; 793 794 name_offset = le16_to_cpu(xs->here->xe_name_offset); 795 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len); 796 i = xs->here - xs->header->xh_entries; 797 798 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) { 799 ret = ocfs2_xattr_bucket_get_name_value(inode, 800 xs->bucket.xh, 801 i, 802 &block_off, 803 &name_offset); 804 xs->base = xs->bucket.bhs[block_off]->b_data; 805 } 806 if (ocfs2_xattr_is_local(xs->here)) { 807 memcpy(buffer, (void *)xs->base + 808 name_offset + name_len, size); 809 } else { 810 xv = (struct ocfs2_xattr_value_root *) 811 (xs->base + name_offset + name_len); 812 ret = ocfs2_xattr_get_value_outside(inode, xv, 813 buffer, size); 814 if (ret < 0) { 815 mlog_errno(ret); 816 goto cleanup; 817 } 818 } 819 } 820 ret = size; 821 cleanup: 822 for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++) 823 brelse(xs->bucket.bhs[i]); 824 memset(&xs->bucket, 0, sizeof(xs->bucket)); 825 826 brelse(blk_bh); 827 return ret; 828 } 829 830 /* ocfs2_xattr_get() 831 * 832 * Copy an extended attribute into the buffer provided. 833 * Buffer is NULL to compute the size of buffer required. 834 */ 835 int ocfs2_xattr_get(struct inode *inode, 836 int name_index, 837 const char *name, 838 void *buffer, 839 size_t buffer_size) 840 { 841 int ret; 842 struct ocfs2_dinode *di = NULL; 843 struct buffer_head *di_bh = NULL; 844 struct ocfs2_inode_info *oi = OCFS2_I(inode); 845 struct ocfs2_xattr_search xis = { 846 .not_found = -ENODATA, 847 }; 848 struct ocfs2_xattr_search xbs = { 849 .not_found = -ENODATA, 850 }; 851 852 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 853 return -EOPNOTSUPP; 854 855 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 856 ret = -ENODATA; 857 858 ret = ocfs2_inode_lock(inode, &di_bh, 0); 859 if (ret < 0) { 860 mlog_errno(ret); 861 return ret; 862 } 863 xis.inode_bh = xbs.inode_bh = di_bh; 864 di = (struct ocfs2_dinode *)di_bh->b_data; 865 866 down_read(&oi->ip_xattr_sem); 867 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer, 868 buffer_size, &xis); 869 if (ret == -ENODATA) 870 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer, 871 buffer_size, &xbs); 872 up_read(&oi->ip_xattr_sem); 873 ocfs2_inode_unlock(inode, 0); 874 875 brelse(di_bh); 876 877 return ret; 878 } 879 880 static int __ocfs2_xattr_set_value_outside(struct inode *inode, 881 struct ocfs2_xattr_value_root *xv, 882 const void *value, 883 int value_len) 884 { 885 int ret = 0, i, cp_len, credits; 886 u16 blocksize = inode->i_sb->s_blocksize; 887 u32 p_cluster, num_clusters; 888 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 889 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len); 890 u64 blkno; 891 struct buffer_head *bh = NULL; 892 handle_t *handle; 893 894 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters)); 895 896 credits = clusters * bpc; 897 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits); 898 if (IS_ERR(handle)) { 899 ret = PTR_ERR(handle); 900 mlog_errno(ret); 901 goto out; 902 } 903 904 while (cpos < clusters) { 905 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, 906 &num_clusters, &xv->xr_list); 907 if (ret) { 908 mlog_errno(ret); 909 goto out_commit; 910 } 911 912 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); 913 914 for (i = 0; i < num_clusters * bpc; i++, blkno++) { 915 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 916 &bh, OCFS2_BH_CACHED, inode); 917 if (ret) { 918 mlog_errno(ret); 919 goto out_commit; 920 } 921 922 ret = ocfs2_journal_access(handle, 923 inode, 924 bh, 925 OCFS2_JOURNAL_ACCESS_WRITE); 926 if (ret < 0) { 927 mlog_errno(ret); 928 goto out_commit; 929 } 930 931 cp_len = value_len > blocksize ? blocksize : value_len; 932 memcpy(bh->b_data, value, cp_len); 933 value_len -= cp_len; 934 value += cp_len; 935 if (cp_len < blocksize) 936 memset(bh->b_data + cp_len, 0, 937 blocksize - cp_len); 938 939 ret = ocfs2_journal_dirty(handle, bh); 940 if (ret < 0) { 941 mlog_errno(ret); 942 goto out_commit; 943 } 944 brelse(bh); 945 bh = NULL; 946 947 /* 948 * XXX: do we need to empty all the following 949 * blocks in this cluster? 950 */ 951 if (!value_len) 952 break; 953 } 954 cpos += num_clusters; 955 } 956 out_commit: 957 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 958 out: 959 brelse(bh); 960 961 return ret; 962 } 963 964 static int ocfs2_xattr_cleanup(struct inode *inode, 965 struct ocfs2_xattr_info *xi, 966 struct ocfs2_xattr_search *xs, 967 size_t offs) 968 { 969 handle_t *handle = NULL; 970 int ret = 0; 971 size_t name_len = strlen(xi->name); 972 void *val = xs->base + offs; 973 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 974 975 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 976 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 977 if (IS_ERR(handle)) { 978 ret = PTR_ERR(handle); 979 mlog_errno(ret); 980 goto out; 981 } 982 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 983 OCFS2_JOURNAL_ACCESS_WRITE); 984 if (ret) { 985 mlog_errno(ret); 986 goto out_commit; 987 } 988 /* Decrease xattr count */ 989 le16_add_cpu(&xs->header->xh_count, -1); 990 /* Remove the xattr entry and tree root which has already be set*/ 991 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry)); 992 memset(val, 0, size); 993 994 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 995 if (ret < 0) 996 mlog_errno(ret); 997 out_commit: 998 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 999 out: 1000 return ret; 1001 } 1002 1003 static int ocfs2_xattr_update_entry(struct inode *inode, 1004 struct ocfs2_xattr_info *xi, 1005 struct ocfs2_xattr_search *xs, 1006 size_t offs) 1007 { 1008 handle_t *handle = NULL; 1009 int ret = 0; 1010 1011 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1012 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1013 if (IS_ERR(handle)) { 1014 ret = PTR_ERR(handle); 1015 mlog_errno(ret); 1016 goto out; 1017 } 1018 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1019 OCFS2_JOURNAL_ACCESS_WRITE); 1020 if (ret) { 1021 mlog_errno(ret); 1022 goto out_commit; 1023 } 1024 1025 xs->here->xe_name_offset = cpu_to_le16(offs); 1026 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1027 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE) 1028 ocfs2_xattr_set_local(xs->here, 1); 1029 else 1030 ocfs2_xattr_set_local(xs->here, 0); 1031 ocfs2_xattr_hash_entry(inode, xs->header, xs->here); 1032 1033 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1034 if (ret < 0) 1035 mlog_errno(ret); 1036 out_commit: 1037 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1038 out: 1039 return ret; 1040 } 1041 1042 /* 1043 * ocfs2_xattr_set_value_outside() 1044 * 1045 * Set large size value in B tree. 1046 */ 1047 static int ocfs2_xattr_set_value_outside(struct inode *inode, 1048 struct ocfs2_xattr_info *xi, 1049 struct ocfs2_xattr_search *xs, 1050 size_t offs) 1051 { 1052 size_t name_len = strlen(xi->name); 1053 void *val = xs->base + offs; 1054 struct ocfs2_xattr_value_root *xv = NULL; 1055 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 1056 int ret = 0; 1057 1058 memset(val, 0, size); 1059 memcpy(val, xi->name, name_len); 1060 xv = (struct ocfs2_xattr_value_root *) 1061 (val + OCFS2_XATTR_SIZE(name_len)); 1062 xv->xr_clusters = 0; 1063 xv->xr_last_eb_blk = 0; 1064 xv->xr_list.l_tree_depth = 0; 1065 xv->xr_list.l_count = cpu_to_le16(1); 1066 xv->xr_list.l_next_free_rec = 0; 1067 1068 ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv, 1069 xi->value_len); 1070 if (ret < 0) { 1071 mlog_errno(ret); 1072 return ret; 1073 } 1074 ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value, 1075 xi->value_len); 1076 if (ret < 0) { 1077 mlog_errno(ret); 1078 return ret; 1079 } 1080 ret = ocfs2_xattr_update_entry(inode, xi, xs, offs); 1081 if (ret < 0) 1082 mlog_errno(ret); 1083 1084 return ret; 1085 } 1086 1087 /* 1088 * ocfs2_xattr_set_entry_local() 1089 * 1090 * Set, replace or remove extended attribute in local. 1091 */ 1092 static void ocfs2_xattr_set_entry_local(struct inode *inode, 1093 struct ocfs2_xattr_info *xi, 1094 struct ocfs2_xattr_search *xs, 1095 struct ocfs2_xattr_entry *last, 1096 size_t min_offs) 1097 { 1098 size_t name_len = strlen(xi->name); 1099 int i; 1100 1101 if (xi->value && xs->not_found) { 1102 /* Insert the new xattr entry. */ 1103 le16_add_cpu(&xs->header->xh_count, 1); 1104 ocfs2_xattr_set_type(last, xi->name_index); 1105 ocfs2_xattr_set_local(last, 1); 1106 last->xe_name_len = name_len; 1107 } else { 1108 void *first_val; 1109 void *val; 1110 size_t offs, size; 1111 1112 first_val = xs->base + min_offs; 1113 offs = le16_to_cpu(xs->here->xe_name_offset); 1114 val = xs->base + offs; 1115 1116 if (le64_to_cpu(xs->here->xe_value_size) > 1117 OCFS2_XATTR_INLINE_SIZE) 1118 size = OCFS2_XATTR_SIZE(name_len) + 1119 OCFS2_XATTR_ROOT_SIZE; 1120 else 1121 size = OCFS2_XATTR_SIZE(name_len) + 1122 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1123 1124 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) + 1125 OCFS2_XATTR_SIZE(xi->value_len)) { 1126 /* The old and the new value have the 1127 same size. Just replace the value. */ 1128 ocfs2_xattr_set_local(xs->here, 1); 1129 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1130 /* Clear value bytes. */ 1131 memset(val + OCFS2_XATTR_SIZE(name_len), 1132 0, 1133 OCFS2_XATTR_SIZE(xi->value_len)); 1134 memcpy(val + OCFS2_XATTR_SIZE(name_len), 1135 xi->value, 1136 xi->value_len); 1137 return; 1138 } 1139 /* Remove the old name+value. */ 1140 memmove(first_val + size, first_val, val - first_val); 1141 memset(first_val, 0, size); 1142 xs->here->xe_name_hash = 0; 1143 xs->here->xe_name_offset = 0; 1144 ocfs2_xattr_set_local(xs->here, 1); 1145 xs->here->xe_value_size = 0; 1146 1147 min_offs += size; 1148 1149 /* Adjust all value offsets. */ 1150 last = xs->header->xh_entries; 1151 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { 1152 size_t o = le16_to_cpu(last->xe_name_offset); 1153 1154 if (o < offs) 1155 last->xe_name_offset = cpu_to_le16(o + size); 1156 last += 1; 1157 } 1158 1159 if (!xi->value) { 1160 /* Remove the old entry. */ 1161 last -= 1; 1162 memmove(xs->here, xs->here + 1, 1163 (void *)last - (void *)xs->here); 1164 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 1165 le16_add_cpu(&xs->header->xh_count, -1); 1166 } 1167 } 1168 if (xi->value) { 1169 /* Insert the new name+value. */ 1170 size_t size = OCFS2_XATTR_SIZE(name_len) + 1171 OCFS2_XATTR_SIZE(xi->value_len); 1172 void *val = xs->base + min_offs - size; 1173 1174 xs->here->xe_name_offset = cpu_to_le16(min_offs - size); 1175 memset(val, 0, size); 1176 memcpy(val, xi->name, name_len); 1177 memcpy(val + OCFS2_XATTR_SIZE(name_len), 1178 xi->value, 1179 xi->value_len); 1180 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1181 ocfs2_xattr_set_local(xs->here, 1); 1182 ocfs2_xattr_hash_entry(inode, xs->header, xs->here); 1183 } 1184 1185 return; 1186 } 1187 1188 /* 1189 * ocfs2_xattr_set_entry() 1190 * 1191 * Set extended attribute entry into inode or block. 1192 * 1193 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE, 1194 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(), 1195 * then set value in B tree with set_value_outside(). 1196 */ 1197 static int ocfs2_xattr_set_entry(struct inode *inode, 1198 struct ocfs2_xattr_info *xi, 1199 struct ocfs2_xattr_search *xs, 1200 int flag) 1201 { 1202 struct ocfs2_xattr_entry *last; 1203 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1204 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1205 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name); 1206 size_t size_l = 0; 1207 handle_t *handle = NULL; 1208 int free, i, ret; 1209 struct ocfs2_xattr_info xi_l = { 1210 .name_index = xi->name_index, 1211 .name = xi->name, 1212 .value = xi->value, 1213 .value_len = xi->value_len, 1214 }; 1215 1216 /* Compute min_offs, last and free space. */ 1217 last = xs->header->xh_entries; 1218 1219 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { 1220 size_t offs = le16_to_cpu(last->xe_name_offset); 1221 if (offs < min_offs) 1222 min_offs = offs; 1223 last += 1; 1224 } 1225 1226 free = min_offs - ((void *)last - xs->base) - sizeof(__u32); 1227 if (free < 0) 1228 return -EFAULT; 1229 1230 if (!xs->not_found) { 1231 size_t size = 0; 1232 if (ocfs2_xattr_is_local(xs->here)) 1233 size = OCFS2_XATTR_SIZE(name_len) + 1234 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1235 else 1236 size = OCFS2_XATTR_SIZE(name_len) + 1237 OCFS2_XATTR_ROOT_SIZE; 1238 free += (size + sizeof(struct ocfs2_xattr_entry)); 1239 } 1240 /* Check free space in inode or block */ 1241 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1242 if (free < sizeof(struct ocfs2_xattr_entry) + 1243 OCFS2_XATTR_SIZE(name_len) + 1244 OCFS2_XATTR_ROOT_SIZE) { 1245 ret = -ENOSPC; 1246 goto out; 1247 } 1248 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 1249 xi_l.value = (void *)&def_xv; 1250 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE; 1251 } else if (xi->value) { 1252 if (free < sizeof(struct ocfs2_xattr_entry) + 1253 OCFS2_XATTR_SIZE(name_len) + 1254 OCFS2_XATTR_SIZE(xi->value_len)) { 1255 ret = -ENOSPC; 1256 goto out; 1257 } 1258 } 1259 1260 if (!xs->not_found) { 1261 /* For existing extended attribute */ 1262 size_t size = OCFS2_XATTR_SIZE(name_len) + 1263 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1264 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1265 void *val = xs->base + offs; 1266 1267 if (ocfs2_xattr_is_local(xs->here) && size == size_l) { 1268 /* Replace existing local xattr with tree root */ 1269 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, 1270 offs); 1271 if (ret < 0) 1272 mlog_errno(ret); 1273 goto out; 1274 } else if (!ocfs2_xattr_is_local(xs->here)) { 1275 /* For existing xattr which has value outside */ 1276 struct ocfs2_xattr_value_root *xv = NULL; 1277 xv = (struct ocfs2_xattr_value_root *)(val + 1278 OCFS2_XATTR_SIZE(name_len)); 1279 1280 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1281 /* 1282 * If new value need set outside also, 1283 * first truncate old value to new value, 1284 * then set new value with set_value_outside(). 1285 */ 1286 ret = ocfs2_xattr_value_truncate(inode, 1287 xs->xattr_bh, 1288 xv, 1289 xi->value_len); 1290 if (ret < 0) { 1291 mlog_errno(ret); 1292 goto out; 1293 } 1294 1295 ret = __ocfs2_xattr_set_value_outside(inode, 1296 xv, 1297 xi->value, 1298 xi->value_len); 1299 if (ret < 0) { 1300 mlog_errno(ret); 1301 goto out; 1302 } 1303 1304 ret = ocfs2_xattr_update_entry(inode, 1305 xi, 1306 xs, 1307 offs); 1308 if (ret < 0) 1309 mlog_errno(ret); 1310 goto out; 1311 } else { 1312 /* 1313 * If new value need set in local, 1314 * just trucate old value to zero. 1315 */ 1316 ret = ocfs2_xattr_value_truncate(inode, 1317 xs->xattr_bh, 1318 xv, 1319 0); 1320 if (ret < 0) 1321 mlog_errno(ret); 1322 } 1323 } 1324 } 1325 1326 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1327 OCFS2_INODE_UPDATE_CREDITS); 1328 if (IS_ERR(handle)) { 1329 ret = PTR_ERR(handle); 1330 mlog_errno(ret); 1331 goto out; 1332 } 1333 1334 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1335 OCFS2_JOURNAL_ACCESS_WRITE); 1336 if (ret) { 1337 mlog_errno(ret); 1338 goto out_commit; 1339 } 1340 1341 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1342 /* set extended attribute in external block. */ 1343 ret = ocfs2_extend_trans(handle, 1344 OCFS2_INODE_UPDATE_CREDITS + 1345 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1346 if (ret) { 1347 mlog_errno(ret); 1348 goto out_commit; 1349 } 1350 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1351 OCFS2_JOURNAL_ACCESS_WRITE); 1352 if (ret) { 1353 mlog_errno(ret); 1354 goto out_commit; 1355 } 1356 } 1357 1358 /* 1359 * Set value in local, include set tree root in local. 1360 * This is the first step for value size >INLINE_SIZE. 1361 */ 1362 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs); 1363 1364 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1365 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1366 if (ret < 0) { 1367 mlog_errno(ret); 1368 goto out_commit; 1369 } 1370 } 1371 1372 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) && 1373 (flag & OCFS2_INLINE_XATTR_FL)) { 1374 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1375 unsigned int xattrsize = osb->s_xattr_inline_size; 1376 1377 /* 1378 * Adjust extent record count or inline data size 1379 * to reserve space for extended attribute. 1380 */ 1381 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1382 struct ocfs2_inline_data *idata = &di->id2.i_data; 1383 le16_add_cpu(&idata->id_count, -xattrsize); 1384 } else if (!(ocfs2_inode_is_fast_symlink(inode))) { 1385 struct ocfs2_extent_list *el = &di->id2.i_list; 1386 le16_add_cpu(&el->l_count, -(xattrsize / 1387 sizeof(struct ocfs2_extent_rec))); 1388 } 1389 di->i_xattr_inline_size = cpu_to_le16(xattrsize); 1390 } 1391 /* Update xattr flag */ 1392 spin_lock(&oi->ip_lock); 1393 oi->ip_dyn_features |= flag; 1394 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1395 spin_unlock(&oi->ip_lock); 1396 /* Update inode ctime */ 1397 inode->i_ctime = CURRENT_TIME; 1398 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); 1399 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 1400 1401 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1402 if (ret < 0) 1403 mlog_errno(ret); 1404 1405 out_commit: 1406 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1407 1408 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1409 /* 1410 * Set value outside in B tree. 1411 * This is the second step for value size > INLINE_SIZE. 1412 */ 1413 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1414 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs); 1415 if (ret < 0) { 1416 int ret2; 1417 1418 mlog_errno(ret); 1419 /* 1420 * If set value outside failed, we have to clean 1421 * the junk tree root we have already set in local. 1422 */ 1423 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs); 1424 if (ret2 < 0) 1425 mlog_errno(ret2); 1426 } 1427 } 1428 out: 1429 return ret; 1430 1431 } 1432 1433 static int ocfs2_remove_value_outside(struct inode*inode, 1434 struct buffer_head *bh, 1435 struct ocfs2_xattr_header *header) 1436 { 1437 int ret = 0, i; 1438 1439 for (i = 0; i < le16_to_cpu(header->xh_count); i++) { 1440 struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; 1441 1442 if (!ocfs2_xattr_is_local(entry)) { 1443 struct ocfs2_xattr_value_root *xv; 1444 void *val; 1445 1446 val = (void *)header + 1447 le16_to_cpu(entry->xe_name_offset); 1448 xv = (struct ocfs2_xattr_value_root *) 1449 (val + OCFS2_XATTR_SIZE(entry->xe_name_len)); 1450 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0); 1451 if (ret < 0) { 1452 mlog_errno(ret); 1453 return ret; 1454 } 1455 } 1456 } 1457 1458 return ret; 1459 } 1460 1461 static int ocfs2_xattr_ibody_remove(struct inode *inode, 1462 struct buffer_head *di_bh) 1463 { 1464 1465 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1466 struct ocfs2_xattr_header *header; 1467 int ret; 1468 1469 header = (struct ocfs2_xattr_header *) 1470 ((void *)di + inode->i_sb->s_blocksize - 1471 le16_to_cpu(di->i_xattr_inline_size)); 1472 1473 ret = ocfs2_remove_value_outside(inode, di_bh, header); 1474 1475 return ret; 1476 } 1477 1478 static int ocfs2_xattr_block_remove(struct inode *inode, 1479 struct buffer_head *blk_bh) 1480 { 1481 struct ocfs2_xattr_block *xb; 1482 int ret = 0; 1483 1484 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1485 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1486 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header); 1487 ret = ocfs2_remove_value_outside(inode, blk_bh, header); 1488 } else 1489 ret = ocfs2_delete_xattr_index_block(inode, blk_bh); 1490 1491 return ret; 1492 } 1493 1494 static int ocfs2_xattr_free_block(struct inode *inode, 1495 u64 block) 1496 { 1497 struct inode *xb_alloc_inode; 1498 struct buffer_head *xb_alloc_bh = NULL; 1499 struct buffer_head *blk_bh = NULL; 1500 struct ocfs2_xattr_block *xb; 1501 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1502 handle_t *handle; 1503 int ret = 0; 1504 u64 blk, bg_blkno; 1505 u16 bit; 1506 1507 ret = ocfs2_read_block(osb, block, &blk_bh, 1508 OCFS2_BH_CACHED, inode); 1509 if (ret < 0) { 1510 mlog_errno(ret); 1511 goto out; 1512 } 1513 1514 /*Verify the signature of xattr block*/ 1515 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 1516 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 1517 ret = -EFAULT; 1518 goto out; 1519 } 1520 1521 ret = ocfs2_xattr_block_remove(inode, blk_bh); 1522 if (ret < 0) { 1523 mlog_errno(ret); 1524 goto out; 1525 } 1526 1527 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1528 blk = le64_to_cpu(xb->xb_blkno); 1529 bit = le16_to_cpu(xb->xb_suballoc_bit); 1530 bg_blkno = ocfs2_which_suballoc_group(blk, bit); 1531 1532 xb_alloc_inode = ocfs2_get_system_file_inode(osb, 1533 EXTENT_ALLOC_SYSTEM_INODE, 1534 le16_to_cpu(xb->xb_suballoc_slot)); 1535 if (!xb_alloc_inode) { 1536 ret = -ENOMEM; 1537 mlog_errno(ret); 1538 goto out; 1539 } 1540 mutex_lock(&xb_alloc_inode->i_mutex); 1541 1542 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1); 1543 if (ret < 0) { 1544 mlog_errno(ret); 1545 goto out_mutex; 1546 } 1547 1548 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE); 1549 if (IS_ERR(handle)) { 1550 ret = PTR_ERR(handle); 1551 mlog_errno(ret); 1552 goto out_unlock; 1553 } 1554 1555 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh, 1556 bit, bg_blkno, 1); 1557 if (ret < 0) 1558 mlog_errno(ret); 1559 1560 ocfs2_commit_trans(osb, handle); 1561 out_unlock: 1562 ocfs2_inode_unlock(xb_alloc_inode, 1); 1563 brelse(xb_alloc_bh); 1564 out_mutex: 1565 mutex_unlock(&xb_alloc_inode->i_mutex); 1566 iput(xb_alloc_inode); 1567 out: 1568 brelse(blk_bh); 1569 return ret; 1570 } 1571 1572 /* 1573 * ocfs2_xattr_remove() 1574 * 1575 * Free extended attribute resources associated with this inode. 1576 */ 1577 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh) 1578 { 1579 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1580 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1581 handle_t *handle; 1582 int ret; 1583 1584 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 1585 return 0; 1586 1587 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 1588 return 0; 1589 1590 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1591 ret = ocfs2_xattr_ibody_remove(inode, di_bh); 1592 if (ret < 0) { 1593 mlog_errno(ret); 1594 goto out; 1595 } 1596 } 1597 1598 if (di->i_xattr_loc) { 1599 ret = ocfs2_xattr_free_block(inode, 1600 le64_to_cpu(di->i_xattr_loc)); 1601 if (ret < 0) { 1602 mlog_errno(ret); 1603 goto out; 1604 } 1605 } 1606 1607 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1608 OCFS2_INODE_UPDATE_CREDITS); 1609 if (IS_ERR(handle)) { 1610 ret = PTR_ERR(handle); 1611 mlog_errno(ret); 1612 goto out; 1613 } 1614 ret = ocfs2_journal_access(handle, inode, di_bh, 1615 OCFS2_JOURNAL_ACCESS_WRITE); 1616 if (ret) { 1617 mlog_errno(ret); 1618 goto out_commit; 1619 } 1620 1621 di->i_xattr_loc = 0; 1622 1623 spin_lock(&oi->ip_lock); 1624 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL); 1625 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1626 spin_unlock(&oi->ip_lock); 1627 1628 ret = ocfs2_journal_dirty(handle, di_bh); 1629 if (ret < 0) 1630 mlog_errno(ret); 1631 out_commit: 1632 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1633 out: 1634 return ret; 1635 } 1636 1637 static int ocfs2_xattr_has_space_inline(struct inode *inode, 1638 struct ocfs2_dinode *di) 1639 { 1640 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1641 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size; 1642 int free; 1643 1644 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE) 1645 return 0; 1646 1647 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1648 struct ocfs2_inline_data *idata = &di->id2.i_data; 1649 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size); 1650 } else if (ocfs2_inode_is_fast_symlink(inode)) { 1651 free = ocfs2_fast_symlink_chars(inode->i_sb) - 1652 le64_to_cpu(di->i_size); 1653 } else { 1654 struct ocfs2_extent_list *el = &di->id2.i_list; 1655 free = (le16_to_cpu(el->l_count) - 1656 le16_to_cpu(el->l_next_free_rec)) * 1657 sizeof(struct ocfs2_extent_rec); 1658 } 1659 if (free >= xattrsize) 1660 return 1; 1661 1662 return 0; 1663 } 1664 1665 /* 1666 * ocfs2_xattr_ibody_find() 1667 * 1668 * Find extended attribute in inode block and 1669 * fill search info into struct ocfs2_xattr_search. 1670 */ 1671 static int ocfs2_xattr_ibody_find(struct inode *inode, 1672 int name_index, 1673 const char *name, 1674 struct ocfs2_xattr_search *xs) 1675 { 1676 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1677 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1678 int ret; 1679 int has_space = 0; 1680 1681 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1682 return 0; 1683 1684 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1685 down_read(&oi->ip_alloc_sem); 1686 has_space = ocfs2_xattr_has_space_inline(inode, di); 1687 up_read(&oi->ip_alloc_sem); 1688 if (!has_space) 1689 return 0; 1690 } 1691 1692 xs->xattr_bh = xs->inode_bh; 1693 xs->end = (void *)di + inode->i_sb->s_blocksize; 1694 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) 1695 xs->header = (struct ocfs2_xattr_header *) 1696 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 1697 else 1698 xs->header = (struct ocfs2_xattr_header *) 1699 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size); 1700 xs->base = (void *)xs->header; 1701 xs->here = xs->header->xh_entries; 1702 1703 /* Find the named attribute. */ 1704 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1705 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1706 if (ret && ret != -ENODATA) 1707 return ret; 1708 xs->not_found = ret; 1709 } 1710 1711 return 0; 1712 } 1713 1714 /* 1715 * ocfs2_xattr_ibody_set() 1716 * 1717 * Set, replace or remove an extended attribute into inode block. 1718 * 1719 */ 1720 static int ocfs2_xattr_ibody_set(struct inode *inode, 1721 struct ocfs2_xattr_info *xi, 1722 struct ocfs2_xattr_search *xs) 1723 { 1724 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1725 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1726 int ret; 1727 1728 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1729 return -ENOSPC; 1730 1731 down_write(&oi->ip_alloc_sem); 1732 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1733 if (!ocfs2_xattr_has_space_inline(inode, di)) { 1734 ret = -ENOSPC; 1735 goto out; 1736 } 1737 } 1738 1739 ret = ocfs2_xattr_set_entry(inode, xi, xs, 1740 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL)); 1741 out: 1742 up_write(&oi->ip_alloc_sem); 1743 1744 return ret; 1745 } 1746 1747 /* 1748 * ocfs2_xattr_block_find() 1749 * 1750 * Find extended attribute in external block and 1751 * fill search info into struct ocfs2_xattr_search. 1752 */ 1753 static int ocfs2_xattr_block_find(struct inode *inode, 1754 int name_index, 1755 const char *name, 1756 struct ocfs2_xattr_search *xs) 1757 { 1758 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1759 struct buffer_head *blk_bh = NULL; 1760 struct ocfs2_xattr_block *xb; 1761 int ret = 0; 1762 1763 if (!di->i_xattr_loc) 1764 return ret; 1765 1766 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1767 le64_to_cpu(di->i_xattr_loc), 1768 &blk_bh, OCFS2_BH_CACHED, inode); 1769 if (ret < 0) { 1770 mlog_errno(ret); 1771 return ret; 1772 } 1773 /*Verify the signature of xattr block*/ 1774 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 1775 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 1776 ret = -EFAULT; 1777 goto cleanup; 1778 } 1779 1780 xs->xattr_bh = blk_bh; 1781 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1782 1783 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1784 xs->header = &xb->xb_attrs.xb_header; 1785 xs->base = (void *)xs->header; 1786 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 1787 xs->here = xs->header->xh_entries; 1788 1789 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1790 } else 1791 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 1792 name_index, 1793 name, xs); 1794 1795 if (ret && ret != -ENODATA) { 1796 xs->xattr_bh = NULL; 1797 goto cleanup; 1798 } 1799 xs->not_found = ret; 1800 return 0; 1801 cleanup: 1802 brelse(blk_bh); 1803 1804 return ret; 1805 } 1806 1807 /* 1808 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree 1809 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header 1810 * re-initialized. 1811 */ 1812 static int ocfs2_restore_xattr_block(struct inode *inode, 1813 struct ocfs2_xattr_search *xs) 1814 { 1815 int ret; 1816 handle_t *handle; 1817 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1818 struct ocfs2_xattr_block *xb = 1819 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1820 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 1821 u16 xb_flags = le16_to_cpu(xb->xb_flags); 1822 1823 BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) || 1824 le16_to_cpu(el->l_next_free_rec) != 0); 1825 1826 handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1827 if (IS_ERR(handle)) { 1828 ret = PTR_ERR(handle); 1829 handle = NULL; 1830 goto out; 1831 } 1832 1833 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1834 OCFS2_JOURNAL_ACCESS_WRITE); 1835 if (ret < 0) { 1836 mlog_errno(ret); 1837 goto out_commit; 1838 } 1839 1840 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 1841 offsetof(struct ocfs2_xattr_block, xb_attrs)); 1842 1843 xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED); 1844 1845 ocfs2_journal_dirty(handle, xs->xattr_bh); 1846 1847 out_commit: 1848 ocfs2_commit_trans(osb, handle); 1849 out: 1850 return ret; 1851 } 1852 1853 /* 1854 * ocfs2_xattr_block_set() 1855 * 1856 * Set, replace or remove an extended attribute into external block. 1857 * 1858 */ 1859 static int ocfs2_xattr_block_set(struct inode *inode, 1860 struct ocfs2_xattr_info *xi, 1861 struct ocfs2_xattr_search *xs) 1862 { 1863 struct buffer_head *new_bh = NULL; 1864 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1865 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1866 struct ocfs2_alloc_context *meta_ac = NULL; 1867 handle_t *handle = NULL; 1868 struct ocfs2_xattr_block *xblk = NULL; 1869 u16 suballoc_bit_start; 1870 u32 num_got; 1871 u64 first_blkno; 1872 int ret; 1873 1874 if (!xs->xattr_bh) { 1875 /* 1876 * Alloc one external block for extended attribute 1877 * outside of inode. 1878 */ 1879 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); 1880 if (ret < 0) { 1881 mlog_errno(ret); 1882 goto out; 1883 } 1884 handle = ocfs2_start_trans(osb, 1885 OCFS2_XATTR_BLOCK_CREATE_CREDITS); 1886 if (IS_ERR(handle)) { 1887 ret = PTR_ERR(handle); 1888 mlog_errno(ret); 1889 goto out; 1890 } 1891 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1892 OCFS2_JOURNAL_ACCESS_CREATE); 1893 if (ret < 0) { 1894 mlog_errno(ret); 1895 goto out_commit; 1896 } 1897 1898 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, 1899 &suballoc_bit_start, &num_got, 1900 &first_blkno); 1901 if (ret < 0) { 1902 mlog_errno(ret); 1903 goto out_commit; 1904 } 1905 1906 new_bh = sb_getblk(inode->i_sb, first_blkno); 1907 ocfs2_set_new_buffer_uptodate(inode, new_bh); 1908 1909 ret = ocfs2_journal_access(handle, inode, new_bh, 1910 OCFS2_JOURNAL_ACCESS_CREATE); 1911 if (ret < 0) { 1912 mlog_errno(ret); 1913 goto out_commit; 1914 } 1915 1916 /* Initialize ocfs2_xattr_block */ 1917 xs->xattr_bh = new_bh; 1918 xblk = (struct ocfs2_xattr_block *)new_bh->b_data; 1919 memset(xblk, 0, inode->i_sb->s_blocksize); 1920 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE); 1921 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num); 1922 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start); 1923 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation); 1924 xblk->xb_blkno = cpu_to_le64(first_blkno); 1925 1926 xs->header = &xblk->xb_attrs.xb_header; 1927 xs->base = (void *)xs->header; 1928 xs->end = (void *)xblk + inode->i_sb->s_blocksize; 1929 xs->here = xs->header->xh_entries; 1930 1931 1932 ret = ocfs2_journal_dirty(handle, new_bh); 1933 if (ret < 0) { 1934 mlog_errno(ret); 1935 goto out_commit; 1936 } 1937 di->i_xattr_loc = cpu_to_le64(first_blkno); 1938 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1939 if (ret < 0) 1940 mlog_errno(ret); 1941 out_commit: 1942 ocfs2_commit_trans(osb, handle); 1943 out: 1944 if (meta_ac) 1945 ocfs2_free_alloc_context(meta_ac); 1946 if (ret < 0) 1947 return ret; 1948 } else 1949 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1950 1951 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) { 1952 /* Set extended attribute into external block */ 1953 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL); 1954 if (!ret || ret != -ENOSPC) 1955 goto end; 1956 1957 ret = ocfs2_xattr_create_index_block(inode, xs); 1958 if (ret) 1959 goto end; 1960 } 1961 1962 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs); 1963 if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0) 1964 ret = ocfs2_restore_xattr_block(inode, xs); 1965 1966 end: 1967 1968 return ret; 1969 } 1970 1971 /* 1972 * ocfs2_xattr_set() 1973 * 1974 * Set, replace or remove an extended attribute for this inode. 1975 * value is NULL to remove an existing extended attribute, else either 1976 * create or replace an extended attribute. 1977 */ 1978 int ocfs2_xattr_set(struct inode *inode, 1979 int name_index, 1980 const char *name, 1981 const void *value, 1982 size_t value_len, 1983 int flags) 1984 { 1985 struct buffer_head *di_bh = NULL; 1986 struct ocfs2_dinode *di; 1987 int ret; 1988 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 1989 1990 struct ocfs2_xattr_info xi = { 1991 .name_index = name_index, 1992 .name = name, 1993 .value = value, 1994 .value_len = value_len, 1995 }; 1996 1997 struct ocfs2_xattr_search xis = { 1998 .not_found = -ENODATA, 1999 }; 2000 2001 struct ocfs2_xattr_search xbs = { 2002 .not_found = -ENODATA, 2003 }; 2004 2005 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 2006 return -EOPNOTSUPP; 2007 2008 ret = ocfs2_inode_lock(inode, &di_bh, 1); 2009 if (ret < 0) { 2010 mlog_errno(ret); 2011 return ret; 2012 } 2013 xis.inode_bh = xbs.inode_bh = di_bh; 2014 di = (struct ocfs2_dinode *)di_bh->b_data; 2015 2016 down_write(&OCFS2_I(inode)->ip_xattr_sem); 2017 /* 2018 * Scan inode and external block to find the same name 2019 * extended attribute and collect search infomation. 2020 */ 2021 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis); 2022 if (ret) 2023 goto cleanup; 2024 if (xis.not_found) { 2025 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs); 2026 if (ret) 2027 goto cleanup; 2028 } 2029 2030 if (xis.not_found && xbs.not_found) { 2031 ret = -ENODATA; 2032 if (flags & XATTR_REPLACE) 2033 goto cleanup; 2034 ret = 0; 2035 if (!value) 2036 goto cleanup; 2037 } else { 2038 ret = -EEXIST; 2039 if (flags & XATTR_CREATE) 2040 goto cleanup; 2041 } 2042 2043 if (!value) { 2044 /* Remove existing extended attribute */ 2045 if (!xis.not_found) 2046 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2047 else if (!xbs.not_found) 2048 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2049 } else { 2050 /* We always try to set extended attribute into inode first*/ 2051 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2052 if (!ret && !xbs.not_found) { 2053 /* 2054 * If succeed and that extended attribute existing in 2055 * external block, then we will remove it. 2056 */ 2057 xi.value = NULL; 2058 xi.value_len = 0; 2059 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2060 } else if (ret == -ENOSPC) { 2061 if (di->i_xattr_loc && !xbs.xattr_bh) { 2062 ret = ocfs2_xattr_block_find(inode, name_index, 2063 name, &xbs); 2064 if (ret) 2065 goto cleanup; 2066 } 2067 /* 2068 * If no space in inode, we will set extended attribute 2069 * into external block. 2070 */ 2071 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2072 if (ret) 2073 goto cleanup; 2074 if (!xis.not_found) { 2075 /* 2076 * If succeed and that extended attribute 2077 * existing in inode, we will remove it. 2078 */ 2079 xi.value = NULL; 2080 xi.value_len = 0; 2081 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2082 } 2083 } 2084 } 2085 cleanup: 2086 up_write(&OCFS2_I(inode)->ip_xattr_sem); 2087 ocfs2_inode_unlock(inode, 1); 2088 brelse(di_bh); 2089 brelse(xbs.xattr_bh); 2090 for (i = 0; i < blk_per_bucket; i++) 2091 brelse(xbs.bucket.bhs[i]); 2092 2093 return ret; 2094 } 2095 2096 static inline u32 ocfs2_xattr_hash_by_name(struct inode *inode, 2097 int name_index, 2098 const char *suffix_name) 2099 { 2100 struct xattr_handler *handler = ocfs2_xattr_handler(name_index); 2101 char *prefix = handler->prefix; 2102 int prefix_len = strlen(handler->prefix); 2103 2104 return ocfs2_xattr_name_hash(inode, prefix, prefix_len, 2105 (char *)suffix_name, strlen(suffix_name)); 2106 } 2107 2108 /* 2109 * Find the xattr extent rec which may contains name_hash. 2110 * e_cpos will be the first name hash of the xattr rec. 2111 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list. 2112 */ 2113 static int ocfs2_xattr_get_rec(struct inode *inode, 2114 u32 name_hash, 2115 u64 *p_blkno, 2116 u32 *e_cpos, 2117 u32 *num_clusters, 2118 struct ocfs2_extent_list *el) 2119 { 2120 int ret = 0, i; 2121 struct buffer_head *eb_bh = NULL; 2122 struct ocfs2_extent_block *eb; 2123 struct ocfs2_extent_rec *rec = NULL; 2124 u64 e_blkno = 0; 2125 2126 if (el->l_tree_depth) { 2127 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh); 2128 if (ret) { 2129 mlog_errno(ret); 2130 goto out; 2131 } 2132 2133 eb = (struct ocfs2_extent_block *) eb_bh->b_data; 2134 el = &eb->h_list; 2135 2136 if (el->l_tree_depth) { 2137 ocfs2_error(inode->i_sb, 2138 "Inode %lu has non zero tree depth in " 2139 "xattr tree block %llu\n", inode->i_ino, 2140 (unsigned long long)eb_bh->b_blocknr); 2141 ret = -EROFS; 2142 goto out; 2143 } 2144 } 2145 2146 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { 2147 rec = &el->l_recs[i]; 2148 2149 if (le32_to_cpu(rec->e_cpos) <= name_hash) { 2150 e_blkno = le64_to_cpu(rec->e_blkno); 2151 break; 2152 } 2153 } 2154 2155 if (!e_blkno) { 2156 ocfs2_error(inode->i_sb, "Inode %lu has bad extent " 2157 "record (%u, %u, 0) in xattr", inode->i_ino, 2158 le32_to_cpu(rec->e_cpos), 2159 ocfs2_rec_clusters(el, rec)); 2160 ret = -EROFS; 2161 goto out; 2162 } 2163 2164 *p_blkno = le64_to_cpu(rec->e_blkno); 2165 *num_clusters = le16_to_cpu(rec->e_leaf_clusters); 2166 if (e_cpos) 2167 *e_cpos = le32_to_cpu(rec->e_cpos); 2168 out: 2169 brelse(eb_bh); 2170 return ret; 2171 } 2172 2173 typedef int (xattr_bucket_func)(struct inode *inode, 2174 struct ocfs2_xattr_bucket *bucket, 2175 void *para); 2176 2177 static int ocfs2_find_xe_in_bucket(struct inode *inode, 2178 struct buffer_head *header_bh, 2179 int name_index, 2180 const char *name, 2181 u32 name_hash, 2182 u16 *xe_index, 2183 int *found) 2184 { 2185 int i, ret = 0, cmp = 1, block_off, new_offset; 2186 struct ocfs2_xattr_header *xh = 2187 (struct ocfs2_xattr_header *)header_bh->b_data; 2188 size_t name_len = strlen(name); 2189 struct ocfs2_xattr_entry *xe = NULL; 2190 struct buffer_head *name_bh = NULL; 2191 char *xe_name; 2192 2193 /* 2194 * We don't use binary search in the bucket because there 2195 * may be multiple entries with the same name hash. 2196 */ 2197 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 2198 xe = &xh->xh_entries[i]; 2199 2200 if (name_hash > le32_to_cpu(xe->xe_name_hash)) 2201 continue; 2202 else if (name_hash < le32_to_cpu(xe->xe_name_hash)) 2203 break; 2204 2205 cmp = name_index - ocfs2_xattr_get_type(xe); 2206 if (!cmp) 2207 cmp = name_len - xe->xe_name_len; 2208 if (cmp) 2209 continue; 2210 2211 ret = ocfs2_xattr_bucket_get_name_value(inode, 2212 xh, 2213 i, 2214 &block_off, 2215 &new_offset); 2216 if (ret) { 2217 mlog_errno(ret); 2218 break; 2219 } 2220 2221 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 2222 header_bh->b_blocknr + block_off, 2223 &name_bh, OCFS2_BH_CACHED, inode); 2224 if (ret) { 2225 mlog_errno(ret); 2226 break; 2227 } 2228 xe_name = name_bh->b_data + new_offset; 2229 2230 cmp = memcmp(name, xe_name, name_len); 2231 brelse(name_bh); 2232 name_bh = NULL; 2233 2234 if (cmp == 0) { 2235 *xe_index = i; 2236 *found = 1; 2237 ret = 0; 2238 break; 2239 } 2240 } 2241 2242 return ret; 2243 } 2244 2245 /* 2246 * Find the specified xattr entry in a series of buckets. 2247 * This series start from p_blkno and last for num_clusters. 2248 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains 2249 * the num of the valid buckets. 2250 * 2251 * Return the buffer_head this xattr should reside in. And if the xattr's 2252 * hash is in the gap of 2 buckets, return the lower bucket. 2253 */ 2254 static int ocfs2_xattr_bucket_find(struct inode *inode, 2255 int name_index, 2256 const char *name, 2257 u32 name_hash, 2258 u64 p_blkno, 2259 u32 first_hash, 2260 u32 num_clusters, 2261 struct ocfs2_xattr_search *xs) 2262 { 2263 int ret, found = 0; 2264 struct buffer_head *bh = NULL; 2265 struct buffer_head *lower_bh = NULL; 2266 struct ocfs2_xattr_header *xh = NULL; 2267 struct ocfs2_xattr_entry *xe = NULL; 2268 u16 index = 0; 2269 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2270 int low_bucket = 0, bucket, high_bucket; 2271 u32 last_hash; 2272 u64 blkno; 2273 2274 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, 2275 &bh, OCFS2_BH_CACHED, inode); 2276 if (ret) { 2277 mlog_errno(ret); 2278 goto out; 2279 } 2280 2281 xh = (struct ocfs2_xattr_header *)bh->b_data; 2282 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1; 2283 2284 while (low_bucket <= high_bucket) { 2285 brelse(bh); 2286 bh = NULL; 2287 bucket = (low_bucket + high_bucket) / 2; 2288 2289 blkno = p_blkno + bucket * blk_per_bucket; 2290 2291 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 2292 &bh, OCFS2_BH_CACHED, inode); 2293 if (ret) { 2294 mlog_errno(ret); 2295 goto out; 2296 } 2297 2298 xh = (struct ocfs2_xattr_header *)bh->b_data; 2299 xe = &xh->xh_entries[0]; 2300 if (name_hash < le32_to_cpu(xe->xe_name_hash)) { 2301 high_bucket = bucket - 1; 2302 continue; 2303 } 2304 2305 /* 2306 * Check whether the hash of the last entry in our 2307 * bucket is larger than the search one. for an empty 2308 * bucket, the last one is also the first one. 2309 */ 2310 if (xh->xh_count) 2311 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1]; 2312 2313 last_hash = le32_to_cpu(xe->xe_name_hash); 2314 2315 /* record lower_bh which may be the insert place. */ 2316 brelse(lower_bh); 2317 lower_bh = bh; 2318 bh = NULL; 2319 2320 if (name_hash > le32_to_cpu(xe->xe_name_hash)) { 2321 low_bucket = bucket + 1; 2322 continue; 2323 } 2324 2325 /* the searched xattr should reside in this bucket if exists. */ 2326 ret = ocfs2_find_xe_in_bucket(inode, lower_bh, 2327 name_index, name, name_hash, 2328 &index, &found); 2329 if (ret) { 2330 mlog_errno(ret); 2331 goto out; 2332 } 2333 break; 2334 } 2335 2336 /* 2337 * Record the bucket we have found. 2338 * When the xattr's hash value is in the gap of 2 buckets, we will 2339 * always set it to the previous bucket. 2340 */ 2341 if (!lower_bh) { 2342 /* 2343 * We can't find any bucket whose first name_hash is less 2344 * than the find name_hash. 2345 */ 2346 BUG_ON(bh->b_blocknr != p_blkno); 2347 lower_bh = bh; 2348 bh = NULL; 2349 } 2350 xs->bucket.bhs[0] = lower_bh; 2351 xs->bucket.xh = (struct ocfs2_xattr_header *) 2352 xs->bucket.bhs[0]->b_data; 2353 lower_bh = NULL; 2354 2355 xs->header = xs->bucket.xh; 2356 xs->base = xs->bucket.bhs[0]->b_data; 2357 xs->end = xs->base + inode->i_sb->s_blocksize; 2358 2359 if (found) { 2360 /* 2361 * If we have found the xattr enty, read all the blocks in 2362 * this bucket. 2363 */ 2364 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2365 xs->bucket.bhs[0]->b_blocknr + 1, 2366 blk_per_bucket - 1, &xs->bucket.bhs[1], 2367 OCFS2_BH_CACHED, inode); 2368 if (ret) { 2369 mlog_errno(ret); 2370 goto out; 2371 } 2372 2373 xs->here = &xs->header->xh_entries[index]; 2374 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name, 2375 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index); 2376 } else 2377 ret = -ENODATA; 2378 2379 out: 2380 brelse(bh); 2381 brelse(lower_bh); 2382 return ret; 2383 } 2384 2385 static int ocfs2_xattr_index_block_find(struct inode *inode, 2386 struct buffer_head *root_bh, 2387 int name_index, 2388 const char *name, 2389 struct ocfs2_xattr_search *xs) 2390 { 2391 int ret; 2392 struct ocfs2_xattr_block *xb = 2393 (struct ocfs2_xattr_block *)root_bh->b_data; 2394 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 2395 struct ocfs2_extent_list *el = &xb_root->xt_list; 2396 u64 p_blkno = 0; 2397 u32 first_hash, num_clusters = 0; 2398 u32 name_hash = ocfs2_xattr_hash_by_name(inode, name_index, name); 2399 2400 if (le16_to_cpu(el->l_next_free_rec) == 0) 2401 return -ENODATA; 2402 2403 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n", 2404 name, name_hash, name_index); 2405 2406 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash, 2407 &num_clusters, el); 2408 if (ret) { 2409 mlog_errno(ret); 2410 goto out; 2411 } 2412 2413 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash); 2414 2415 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash " 2416 "in the rec is %u\n", num_clusters, p_blkno, first_hash); 2417 2418 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash, 2419 p_blkno, first_hash, num_clusters, xs); 2420 2421 out: 2422 return ret; 2423 } 2424 2425 static int ocfs2_iterate_xattr_buckets(struct inode *inode, 2426 u64 blkno, 2427 u32 clusters, 2428 xattr_bucket_func *func, 2429 void *para) 2430 { 2431 int i, j, ret = 0; 2432 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2433 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)); 2434 u32 num_buckets = clusters * bpc; 2435 struct ocfs2_xattr_bucket bucket; 2436 2437 memset(&bucket, 0, sizeof(bucket)); 2438 2439 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n", 2440 clusters, blkno); 2441 2442 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) { 2443 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2444 blkno, blk_per_bucket, 2445 bucket.bhs, OCFS2_BH_CACHED, inode); 2446 if (ret) { 2447 mlog_errno(ret); 2448 goto out; 2449 } 2450 2451 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data; 2452 /* 2453 * The real bucket num in this series of blocks is stored 2454 * in the 1st bucket. 2455 */ 2456 if (i == 0) 2457 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets); 2458 2459 mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno, 2460 le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash)); 2461 if (func) { 2462 ret = func(inode, &bucket, para); 2463 if (ret) { 2464 mlog_errno(ret); 2465 break; 2466 } 2467 } 2468 2469 for (j = 0; j < blk_per_bucket; j++) 2470 brelse(bucket.bhs[j]); 2471 memset(&bucket, 0, sizeof(bucket)); 2472 } 2473 2474 out: 2475 for (j = 0; j < blk_per_bucket; j++) 2476 brelse(bucket.bhs[j]); 2477 2478 return ret; 2479 } 2480 2481 struct ocfs2_xattr_tree_list { 2482 char *buffer; 2483 size_t buffer_size; 2484 }; 2485 2486 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, 2487 struct ocfs2_xattr_header *xh, 2488 int index, 2489 int *block_off, 2490 int *new_offset) 2491 { 2492 u16 name_offset; 2493 2494 if (index < 0 || index >= le16_to_cpu(xh->xh_count)) 2495 return -EINVAL; 2496 2497 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset); 2498 2499 *block_off = name_offset >> inode->i_sb->s_blocksize_bits; 2500 *new_offset = name_offset % inode->i_sb->s_blocksize; 2501 2502 return 0; 2503 } 2504 2505 static int ocfs2_list_xattr_bucket(struct inode *inode, 2506 struct ocfs2_xattr_bucket *bucket, 2507 void *para) 2508 { 2509 int ret = 0; 2510 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para; 2511 size_t size; 2512 int i, block_off, new_offset; 2513 2514 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) { 2515 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i]; 2516 struct xattr_handler *handler = 2517 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); 2518 2519 if (handler) { 2520 ret = ocfs2_xattr_bucket_get_name_value(inode, 2521 bucket->xh, 2522 i, 2523 &block_off, 2524 &new_offset); 2525 if (ret) 2526 break; 2527 size = handler->list(inode, xl->buffer, xl->buffer_size, 2528 bucket->bhs[block_off]->b_data + 2529 new_offset, 2530 entry->xe_name_len); 2531 if (xl->buffer) { 2532 if (size > xl->buffer_size) 2533 return -ERANGE; 2534 xl->buffer += size; 2535 } 2536 xl->buffer_size -= size; 2537 } 2538 } 2539 2540 return ret; 2541 } 2542 2543 static int ocfs2_xattr_tree_list_index_block(struct inode *inode, 2544 struct ocfs2_xattr_tree_root *xt, 2545 char *buffer, 2546 size_t buffer_size) 2547 { 2548 struct ocfs2_extent_list *el = &xt->xt_list; 2549 int ret = 0; 2550 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0; 2551 u64 p_blkno = 0; 2552 struct ocfs2_xattr_tree_list xl = { 2553 .buffer = buffer, 2554 .buffer_size = buffer_size, 2555 }; 2556 2557 if (le16_to_cpu(el->l_next_free_rec) == 0) 2558 return 0; 2559 2560 while (name_hash > 0) { 2561 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 2562 &e_cpos, &num_clusters, el); 2563 if (ret) { 2564 mlog_errno(ret); 2565 goto out; 2566 } 2567 2568 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 2569 ocfs2_list_xattr_bucket, 2570 &xl); 2571 if (ret) { 2572 mlog_errno(ret); 2573 goto out; 2574 } 2575 2576 if (e_cpos == 0) 2577 break; 2578 2579 name_hash = e_cpos - 1; 2580 } 2581 2582 ret = buffer_size - xl.buffer_size; 2583 out: 2584 return ret; 2585 } 2586 2587 static int cmp_xe(const void *a, const void *b) 2588 { 2589 const struct ocfs2_xattr_entry *l = a, *r = b; 2590 u32 l_hash = le32_to_cpu(l->xe_name_hash); 2591 u32 r_hash = le32_to_cpu(r->xe_name_hash); 2592 2593 if (l_hash > r_hash) 2594 return 1; 2595 if (l_hash < r_hash) 2596 return -1; 2597 return 0; 2598 } 2599 2600 static void swap_xe(void *a, void *b, int size) 2601 { 2602 struct ocfs2_xattr_entry *l = a, *r = b, tmp; 2603 2604 tmp = *l; 2605 memcpy(l, r, sizeof(struct ocfs2_xattr_entry)); 2606 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry)); 2607 } 2608 2609 /* 2610 * When the ocfs2_xattr_block is filled up, new bucket will be created 2611 * and all the xattr entries will be moved to the new bucket. 2612 * Note: we need to sort the entries since they are not saved in order 2613 * in the ocfs2_xattr_block. 2614 */ 2615 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode, 2616 struct buffer_head *xb_bh, 2617 struct buffer_head *xh_bh, 2618 struct buffer_head *data_bh) 2619 { 2620 int i, blocksize = inode->i_sb->s_blocksize; 2621 u16 offset, size, off_change; 2622 struct ocfs2_xattr_entry *xe; 2623 struct ocfs2_xattr_block *xb = 2624 (struct ocfs2_xattr_block *)xb_bh->b_data; 2625 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header; 2626 struct ocfs2_xattr_header *xh = 2627 (struct ocfs2_xattr_header *)xh_bh->b_data; 2628 u16 count = le16_to_cpu(xb_xh->xh_count); 2629 char *target = xh_bh->b_data, *src = xb_bh->b_data; 2630 2631 mlog(0, "cp xattr from block %llu to bucket %llu\n", 2632 (unsigned long long)xb_bh->b_blocknr, 2633 (unsigned long long)xh_bh->b_blocknr); 2634 2635 memset(xh_bh->b_data, 0, blocksize); 2636 if (data_bh) 2637 memset(data_bh->b_data, 0, blocksize); 2638 /* 2639 * Since the xe_name_offset is based on ocfs2_xattr_header, 2640 * there is a offset change corresponding to the change of 2641 * ocfs2_xattr_header's position. 2642 */ 2643 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2644 xe = &xb_xh->xh_entries[count - 1]; 2645 offset = le16_to_cpu(xe->xe_name_offset) + off_change; 2646 size = blocksize - offset; 2647 2648 /* copy all the names and values. */ 2649 if (data_bh) 2650 target = data_bh->b_data; 2651 memcpy(target + offset, src + offset, size); 2652 2653 /* Init new header now. */ 2654 xh->xh_count = xb_xh->xh_count; 2655 xh->xh_num_buckets = cpu_to_le16(1); 2656 xh->xh_name_value_len = cpu_to_le16(size); 2657 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size); 2658 2659 /* copy all the entries. */ 2660 target = xh_bh->b_data; 2661 offset = offsetof(struct ocfs2_xattr_header, xh_entries); 2662 size = count * sizeof(struct ocfs2_xattr_entry); 2663 memcpy(target + offset, (char *)xb_xh + offset, size); 2664 2665 /* Change the xe offset for all the xe because of the move. */ 2666 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize + 2667 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2668 for (i = 0; i < count; i++) 2669 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change); 2670 2671 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n", 2672 offset, size, off_change); 2673 2674 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry), 2675 cmp_xe, swap_xe); 2676 } 2677 2678 /* 2679 * After we move xattr from block to index btree, we have to 2680 * update ocfs2_xattr_search to the new xe and base. 2681 * 2682 * When the entry is in xattr block, xattr_bh indicates the storage place. 2683 * While if the entry is in index b-tree, "bucket" indicates the 2684 * real place of the xattr. 2685 */ 2686 static int ocfs2_xattr_update_xattr_search(struct inode *inode, 2687 struct ocfs2_xattr_search *xs, 2688 struct buffer_head *old_bh, 2689 struct buffer_head *new_bh) 2690 { 2691 int ret = 0; 2692 char *buf = old_bh->b_data; 2693 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf; 2694 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header; 2695 int i, blocksize = inode->i_sb->s_blocksize; 2696 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2697 2698 xs->bucket.bhs[0] = new_bh; 2699 get_bh(new_bh); 2700 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data; 2701 xs->header = xs->bucket.xh; 2702 2703 xs->base = new_bh->b_data; 2704 xs->end = xs->base + inode->i_sb->s_blocksize; 2705 2706 if (!xs->not_found) { 2707 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) { 2708 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2709 xs->bucket.bhs[0]->b_blocknr + 1, 2710 blk_per_bucket - 1, &xs->bucket.bhs[1], 2711 OCFS2_BH_CACHED, inode); 2712 if (ret) { 2713 mlog_errno(ret); 2714 return ret; 2715 } 2716 2717 i = xs->here - old_xh->xh_entries; 2718 xs->here = &xs->header->xh_entries[i]; 2719 } 2720 } 2721 2722 return ret; 2723 } 2724 2725 static int ocfs2_xattr_create_index_block(struct inode *inode, 2726 struct ocfs2_xattr_search *xs) 2727 { 2728 int ret, credits = OCFS2_SUBALLOC_ALLOC; 2729 u32 bit_off, len; 2730 u64 blkno; 2731 handle_t *handle; 2732 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2733 struct ocfs2_inode_info *oi = OCFS2_I(inode); 2734 struct ocfs2_alloc_context *data_ac; 2735 struct buffer_head *xh_bh = NULL, *data_bh = NULL; 2736 struct buffer_head *xb_bh = xs->xattr_bh; 2737 struct ocfs2_xattr_block *xb = 2738 (struct ocfs2_xattr_block *)xb_bh->b_data; 2739 struct ocfs2_xattr_tree_root *xr; 2740 u16 xb_flags = le16_to_cpu(xb->xb_flags); 2741 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2742 2743 mlog(0, "create xattr index block for %llu\n", 2744 (unsigned long long)xb_bh->b_blocknr); 2745 2746 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED); 2747 2748 ret = ocfs2_reserve_clusters(osb, 1, &data_ac); 2749 if (ret) { 2750 mlog_errno(ret); 2751 goto out; 2752 } 2753 2754 /* 2755 * XXX: 2756 * We can use this lock for now, and maybe move to a dedicated mutex 2757 * if performance becomes a problem later. 2758 */ 2759 down_write(&oi->ip_alloc_sem); 2760 2761 /* 2762 * 3 more credits, one for xattr block update, one for the 1st block 2763 * of the new xattr bucket and one for the value/data. 2764 */ 2765 credits += 3; 2766 handle = ocfs2_start_trans(osb, credits); 2767 if (IS_ERR(handle)) { 2768 ret = PTR_ERR(handle); 2769 mlog_errno(ret); 2770 goto out_sem; 2771 } 2772 2773 ret = ocfs2_journal_access(handle, inode, xb_bh, 2774 OCFS2_JOURNAL_ACCESS_WRITE); 2775 if (ret) { 2776 mlog_errno(ret); 2777 goto out_commit; 2778 } 2779 2780 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len); 2781 if (ret) { 2782 mlog_errno(ret); 2783 goto out_commit; 2784 } 2785 2786 /* 2787 * The bucket may spread in many blocks, and 2788 * we will only touch the 1st block and the last block 2789 * in the whole bucket(one for entry and one for data). 2790 */ 2791 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off); 2792 2793 mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno); 2794 2795 xh_bh = sb_getblk(inode->i_sb, blkno); 2796 if (!xh_bh) { 2797 ret = -EIO; 2798 mlog_errno(ret); 2799 goto out_commit; 2800 } 2801 2802 ocfs2_set_new_buffer_uptodate(inode, xh_bh); 2803 2804 ret = ocfs2_journal_access(handle, inode, xh_bh, 2805 OCFS2_JOURNAL_ACCESS_CREATE); 2806 if (ret) { 2807 mlog_errno(ret); 2808 goto out_commit; 2809 } 2810 2811 if (bpb > 1) { 2812 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1); 2813 if (!data_bh) { 2814 ret = -EIO; 2815 mlog_errno(ret); 2816 goto out_commit; 2817 } 2818 2819 ocfs2_set_new_buffer_uptodate(inode, data_bh); 2820 2821 ret = ocfs2_journal_access(handle, inode, data_bh, 2822 OCFS2_JOURNAL_ACCESS_CREATE); 2823 if (ret) { 2824 mlog_errno(ret); 2825 goto out_commit; 2826 } 2827 } 2828 2829 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh); 2830 2831 ocfs2_journal_dirty(handle, xh_bh); 2832 if (data_bh) 2833 ocfs2_journal_dirty(handle, data_bh); 2834 2835 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh); 2836 2837 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */ 2838 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 2839 offsetof(struct ocfs2_xattr_block, xb_attrs)); 2840 2841 xr = &xb->xb_attrs.xb_root; 2842 xr->xt_clusters = cpu_to_le32(1); 2843 xr->xt_last_eb_blk = 0; 2844 xr->xt_list.l_tree_depth = 0; 2845 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb)); 2846 xr->xt_list.l_next_free_rec = cpu_to_le16(1); 2847 2848 xr->xt_list.l_recs[0].e_cpos = 0; 2849 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno); 2850 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1); 2851 2852 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED); 2853 2854 ret = ocfs2_journal_dirty(handle, xb_bh); 2855 if (ret) { 2856 mlog_errno(ret); 2857 goto out_commit; 2858 } 2859 2860 out_commit: 2861 ocfs2_commit_trans(osb, handle); 2862 2863 out_sem: 2864 up_write(&oi->ip_alloc_sem); 2865 2866 out: 2867 if (data_ac) 2868 ocfs2_free_alloc_context(data_ac); 2869 2870 brelse(xh_bh); 2871 brelse(data_bh); 2872 2873 return ret; 2874 } 2875 2876 static int cmp_xe_offset(const void *a, const void *b) 2877 { 2878 const struct ocfs2_xattr_entry *l = a, *r = b; 2879 u32 l_name_offset = le16_to_cpu(l->xe_name_offset); 2880 u32 r_name_offset = le16_to_cpu(r->xe_name_offset); 2881 2882 if (l_name_offset < r_name_offset) 2883 return 1; 2884 if (l_name_offset > r_name_offset) 2885 return -1; 2886 return 0; 2887 } 2888 2889 /* 2890 * defrag a xattr bucket if we find that the bucket has some 2891 * holes beteen name/value pairs. 2892 * We will move all the name/value pairs to the end of the bucket 2893 * so that we can spare some space for insertion. 2894 */ 2895 static int ocfs2_defrag_xattr_bucket(struct inode *inode, 2896 struct ocfs2_xattr_bucket *bucket) 2897 { 2898 int ret, i; 2899 size_t end, offset, len, value_len; 2900 struct ocfs2_xattr_header *xh; 2901 char *entries, *buf, *bucket_buf = NULL; 2902 u64 blkno = bucket->bhs[0]->b_blocknr; 2903 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2904 u16 xh_free_start; 2905 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2906 size_t blocksize = inode->i_sb->s_blocksize; 2907 handle_t *handle; 2908 struct buffer_head **bhs; 2909 struct ocfs2_xattr_entry *xe; 2910 2911 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 2912 GFP_NOFS); 2913 if (!bhs) 2914 return -ENOMEM; 2915 2916 ret = ocfs2_read_blocks(osb, blkno, blk_per_bucket, bhs, 2917 OCFS2_BH_CACHED, inode); 2918 if (ret) 2919 goto out; 2920 2921 /* 2922 * In order to make the operation more efficient and generic, 2923 * we copy all the blocks into a contiguous memory and do the 2924 * defragment there, so if anything is error, we will not touch 2925 * the real block. 2926 */ 2927 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS); 2928 if (!bucket_buf) { 2929 ret = -EIO; 2930 goto out; 2931 } 2932 2933 buf = bucket_buf; 2934 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) 2935 memcpy(buf, bhs[i]->b_data, blocksize); 2936 2937 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket); 2938 if (IS_ERR(handle)) { 2939 ret = PTR_ERR(handle); 2940 handle = NULL; 2941 mlog_errno(ret); 2942 goto out; 2943 } 2944 2945 for (i = 0; i < blk_per_bucket; i++) { 2946 ret = ocfs2_journal_access(handle, inode, bhs[i], 2947 OCFS2_JOURNAL_ACCESS_WRITE); 2948 if (ret < 0) { 2949 mlog_errno(ret); 2950 goto commit; 2951 } 2952 } 2953 2954 xh = (struct ocfs2_xattr_header *)bucket_buf; 2955 entries = (char *)xh->xh_entries; 2956 xh_free_start = le16_to_cpu(xh->xh_free_start); 2957 2958 mlog(0, "adjust xattr bucket in %llu, count = %u, " 2959 "xh_free_start = %u, xh_name_value_len = %u.\n", 2960 blkno, le16_to_cpu(xh->xh_count), xh_free_start, 2961 le16_to_cpu(xh->xh_name_value_len)); 2962 2963 /* 2964 * sort all the entries by their offset. 2965 * the largest will be the first, so that we can 2966 * move them to the end one by one. 2967 */ 2968 sort(entries, le16_to_cpu(xh->xh_count), 2969 sizeof(struct ocfs2_xattr_entry), 2970 cmp_xe_offset, swap_xe); 2971 2972 /* Move all name/values to the end of the bucket. */ 2973 xe = xh->xh_entries; 2974 end = OCFS2_XATTR_BUCKET_SIZE; 2975 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) { 2976 offset = le16_to_cpu(xe->xe_name_offset); 2977 if (ocfs2_xattr_is_local(xe)) 2978 value_len = OCFS2_XATTR_SIZE( 2979 le64_to_cpu(xe->xe_value_size)); 2980 else 2981 value_len = OCFS2_XATTR_ROOT_SIZE; 2982 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len; 2983 2984 /* 2985 * We must make sure that the name/value pair 2986 * exist in the same block. So adjust end to 2987 * the previous block end if needed. 2988 */ 2989 if (((end - len) / blocksize != 2990 (end - 1) / blocksize)) 2991 end = end - end % blocksize; 2992 2993 if (end > offset + len) { 2994 memmove(bucket_buf + end - len, 2995 bucket_buf + offset, len); 2996 xe->xe_name_offset = cpu_to_le16(end - len); 2997 } 2998 2999 mlog_bug_on_msg(end < offset + len, "Defrag check failed for " 3000 "bucket %llu\n", (unsigned long long)blkno); 3001 3002 end -= len; 3003 } 3004 3005 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for " 3006 "bucket %llu\n", (unsigned long long)blkno); 3007 3008 if (xh_free_start == end) 3009 goto commit; 3010 3011 memset(bucket_buf + xh_free_start, 0, end - xh_free_start); 3012 xh->xh_free_start = cpu_to_le16(end); 3013 3014 /* sort the entries by their name_hash. */ 3015 sort(entries, le16_to_cpu(xh->xh_count), 3016 sizeof(struct ocfs2_xattr_entry), 3017 cmp_xe, swap_xe); 3018 3019 buf = bucket_buf; 3020 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) { 3021 memcpy(bhs[i]->b_data, buf, blocksize); 3022 ocfs2_journal_dirty(handle, bhs[i]); 3023 } 3024 3025 commit: 3026 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 3027 out: 3028 3029 if (bhs) { 3030 for (i = 0; i < blk_per_bucket; i++) 3031 brelse(bhs[i]); 3032 } 3033 kfree(bhs); 3034 3035 kfree(bucket_buf); 3036 return ret; 3037 } 3038 3039 /* 3040 * Move half nums of the xattr bucket in the previous cluster to this new 3041 * cluster. We only touch the last cluster of the previous extend record. 3042 * 3043 * first_bh is the first buffer_head of a series of bucket in the same 3044 * extent rec and header_bh is the header of one bucket in this cluster. 3045 * They will be updated if we move the data header_bh contains to the new 3046 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster. 3047 */ 3048 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode, 3049 handle_t *handle, 3050 struct buffer_head **first_bh, 3051 struct buffer_head **header_bh, 3052 u64 new_blkno, 3053 u64 prev_blkno, 3054 u32 num_clusters, 3055 u32 *first_hash) 3056 { 3057 int i, ret, credits; 3058 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3059 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3060 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3061 int blocksize = inode->i_sb->s_blocksize; 3062 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL; 3063 struct ocfs2_xattr_header *new_xh; 3064 struct ocfs2_xattr_header *xh = 3065 (struct ocfs2_xattr_header *)((*first_bh)->b_data); 3066 3067 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets); 3068 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize); 3069 3070 prev_bh = *first_bh; 3071 get_bh(prev_bh); 3072 xh = (struct ocfs2_xattr_header *)prev_bh->b_data; 3073 3074 prev_blkno += (num_clusters - 1) * bpc + bpc / 2; 3075 3076 mlog(0, "move half of xattrs in cluster %llu to %llu\n", 3077 prev_blkno, new_blkno); 3078 3079 /* 3080 * We need to update the 1st half of the new cluster and 3081 * 1 more for the update of the 1st bucket of the previous 3082 * extent record. 3083 */ 3084 credits = bpc / 2 + 1; 3085 ret = ocfs2_extend_trans(handle, credits); 3086 if (ret) { 3087 mlog_errno(ret); 3088 goto out; 3089 } 3090 3091 ret = ocfs2_journal_access(handle, inode, prev_bh, 3092 OCFS2_JOURNAL_ACCESS_WRITE); 3093 if (ret) { 3094 mlog_errno(ret); 3095 goto out; 3096 } 3097 3098 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) { 3099 old_bh = new_bh = NULL; 3100 new_bh = sb_getblk(inode->i_sb, new_blkno); 3101 if (!new_bh) { 3102 ret = -EIO; 3103 mlog_errno(ret); 3104 goto out; 3105 } 3106 3107 ocfs2_set_new_buffer_uptodate(inode, new_bh); 3108 3109 ret = ocfs2_journal_access(handle, inode, new_bh, 3110 OCFS2_JOURNAL_ACCESS_CREATE); 3111 if (ret < 0) { 3112 mlog_errno(ret); 3113 brelse(new_bh); 3114 goto out; 3115 } 3116 3117 ret = ocfs2_read_block(osb, prev_blkno, 3118 &old_bh, OCFS2_BH_CACHED, inode); 3119 if (ret < 0) { 3120 mlog_errno(ret); 3121 brelse(new_bh); 3122 goto out; 3123 } 3124 3125 memcpy(new_bh->b_data, old_bh->b_data, blocksize); 3126 3127 if (i == 0) { 3128 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data; 3129 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2); 3130 3131 if (first_hash) 3132 *first_hash = le32_to_cpu( 3133 new_xh->xh_entries[0].xe_name_hash); 3134 new_first_bh = new_bh; 3135 get_bh(new_first_bh); 3136 } 3137 3138 ocfs2_journal_dirty(handle, new_bh); 3139 3140 if (*header_bh == old_bh) { 3141 brelse(*header_bh); 3142 *header_bh = new_bh; 3143 get_bh(*header_bh); 3144 3145 brelse(*first_bh); 3146 *first_bh = new_first_bh; 3147 get_bh(*first_bh); 3148 } 3149 brelse(new_bh); 3150 brelse(old_bh); 3151 } 3152 3153 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2)); 3154 3155 ocfs2_journal_dirty(handle, prev_bh); 3156 out: 3157 brelse(prev_bh); 3158 brelse(new_first_bh); 3159 return ret; 3160 } 3161 3162 static int ocfs2_read_xattr_bucket(struct inode *inode, 3163 u64 blkno, 3164 struct buffer_head **bhs, 3165 int new) 3166 { 3167 int ret = 0; 3168 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3169 3170 if (!new) 3171 return ocfs2_read_blocks(OCFS2_SB(inode->i_sb), blkno, 3172 blk_per_bucket, bhs, 3173 OCFS2_BH_CACHED, inode); 3174 3175 for (i = 0; i < blk_per_bucket; i++) { 3176 bhs[i] = sb_getblk(inode->i_sb, blkno + i); 3177 if (bhs[i] == NULL) { 3178 ret = -EIO; 3179 mlog_errno(ret); 3180 break; 3181 } 3182 ocfs2_set_new_buffer_uptodate(inode, bhs[i]); 3183 } 3184 3185 return ret; 3186 } 3187 3188 /* 3189 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk). 3190 * first_hash will record the 1st hash of the new bucket. 3191 */ 3192 static int ocfs2_half_xattr_bucket(struct inode *inode, 3193 handle_t *handle, 3194 u64 blk, 3195 u64 new_blk, 3196 u32 *first_hash, 3197 int new_bucket_head) 3198 { 3199 int ret, i; 3200 u16 count, start, len, name_value_len, xe_len, name_offset; 3201 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3202 struct buffer_head **s_bhs, **t_bhs = NULL; 3203 struct ocfs2_xattr_header *xh; 3204 struct ocfs2_xattr_entry *xe; 3205 int blocksize = inode->i_sb->s_blocksize; 3206 3207 mlog(0, "move half of xattrs from bucket %llu to %llu\n", 3208 blk, new_blk); 3209 3210 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3211 if (!s_bhs) 3212 return -ENOMEM; 3213 3214 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0); 3215 if (ret) { 3216 mlog_errno(ret); 3217 goto out; 3218 } 3219 3220 ret = ocfs2_journal_access(handle, inode, s_bhs[0], 3221 OCFS2_JOURNAL_ACCESS_WRITE); 3222 if (ret) { 3223 mlog_errno(ret); 3224 goto out; 3225 } 3226 3227 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3228 if (!t_bhs) { 3229 ret = -ENOMEM; 3230 goto out; 3231 } 3232 3233 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head); 3234 if (ret) { 3235 mlog_errno(ret); 3236 goto out; 3237 } 3238 3239 for (i = 0; i < blk_per_bucket; i++) { 3240 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3241 OCFS2_JOURNAL_ACCESS_CREATE); 3242 if (ret) { 3243 mlog_errno(ret); 3244 goto out; 3245 } 3246 } 3247 3248 /* copy the whole bucket to the new first. */ 3249 for (i = 0; i < blk_per_bucket; i++) 3250 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3251 3252 /* update the new bucket. */ 3253 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data; 3254 count = le16_to_cpu(xh->xh_count); 3255 start = count / 2; 3256 3257 /* 3258 * Calculate the total name/value len and xh_free_start for 3259 * the old bucket first. 3260 */ 3261 name_offset = OCFS2_XATTR_BUCKET_SIZE; 3262 name_value_len = 0; 3263 for (i = 0; i < start; i++) { 3264 xe = &xh->xh_entries[i]; 3265 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3266 if (ocfs2_xattr_is_local(xe)) 3267 xe_len += 3268 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3269 else 3270 xe_len += OCFS2_XATTR_ROOT_SIZE; 3271 name_value_len += xe_len; 3272 if (le16_to_cpu(xe->xe_name_offset) < name_offset) 3273 name_offset = le16_to_cpu(xe->xe_name_offset); 3274 } 3275 3276 /* 3277 * Now begin the modification to the new bucket. 3278 * 3279 * In the new bucket, We just move the xattr entry to the beginning 3280 * and don't touch the name/value. So there will be some holes in the 3281 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is 3282 * called. 3283 */ 3284 xe = &xh->xh_entries[start]; 3285 len = sizeof(struct ocfs2_xattr_entry) * (count - start); 3286 mlog(0, "mv xattr entry len %d from %d to %d\n", len, 3287 (int)((char *)xe - (char *)xh), 3288 (int)((char *)xh->xh_entries - (char *)xh)); 3289 memmove((char *)xh->xh_entries, (char *)xe, len); 3290 xe = &xh->xh_entries[count - start]; 3291 len = sizeof(struct ocfs2_xattr_entry) * start; 3292 memset((char *)xe, 0, len); 3293 3294 le16_add_cpu(&xh->xh_count, -start); 3295 le16_add_cpu(&xh->xh_name_value_len, -name_value_len); 3296 3297 /* Calculate xh_free_start for the new bucket. */ 3298 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); 3299 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 3300 xe = &xh->xh_entries[i]; 3301 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3302 if (ocfs2_xattr_is_local(xe)) 3303 xe_len += 3304 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3305 else 3306 xe_len += OCFS2_XATTR_ROOT_SIZE; 3307 if (le16_to_cpu(xe->xe_name_offset) < 3308 le16_to_cpu(xh->xh_free_start)) 3309 xh->xh_free_start = xe->xe_name_offset; 3310 } 3311 3312 /* set xh->xh_num_buckets for the new xh. */ 3313 if (new_bucket_head) 3314 xh->xh_num_buckets = cpu_to_le16(1); 3315 else 3316 xh->xh_num_buckets = 0; 3317 3318 for (i = 0; i < blk_per_bucket; i++) { 3319 ocfs2_journal_dirty(handle, t_bhs[i]); 3320 if (ret) 3321 mlog_errno(ret); 3322 } 3323 3324 /* store the first_hash of the new bucket. */ 3325 if (first_hash) 3326 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3327 3328 /* 3329 * Now only update the 1st block of the old bucket. 3330 * Please note that the entry has been sorted already above. 3331 */ 3332 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data; 3333 memset(&xh->xh_entries[start], 0, 3334 sizeof(struct ocfs2_xattr_entry) * (count - start)); 3335 xh->xh_count = cpu_to_le16(start); 3336 xh->xh_free_start = cpu_to_le16(name_offset); 3337 xh->xh_name_value_len = cpu_to_le16(name_value_len); 3338 3339 ocfs2_journal_dirty(handle, s_bhs[0]); 3340 if (ret) 3341 mlog_errno(ret); 3342 3343 out: 3344 if (s_bhs) { 3345 for (i = 0; i < blk_per_bucket; i++) 3346 brelse(s_bhs[i]); 3347 } 3348 kfree(s_bhs); 3349 3350 if (t_bhs) { 3351 for (i = 0; i < blk_per_bucket; i++) 3352 brelse(t_bhs[i]); 3353 } 3354 kfree(t_bhs); 3355 3356 return ret; 3357 } 3358 3359 /* 3360 * Copy xattr from one bucket to another bucket. 3361 * 3362 * The caller must make sure that the journal transaction 3363 * has enough space for journaling. 3364 */ 3365 static int ocfs2_cp_xattr_bucket(struct inode *inode, 3366 handle_t *handle, 3367 u64 s_blkno, 3368 u64 t_blkno, 3369 int t_is_new) 3370 { 3371 int ret, i; 3372 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3373 int blocksize = inode->i_sb->s_blocksize; 3374 struct buffer_head **s_bhs, **t_bhs = NULL; 3375 3376 BUG_ON(s_blkno == t_blkno); 3377 3378 mlog(0, "cp bucket %llu to %llu, target is %d\n", 3379 s_blkno, t_blkno, t_is_new); 3380 3381 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3382 GFP_NOFS); 3383 if (!s_bhs) 3384 return -ENOMEM; 3385 3386 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0); 3387 if (ret) 3388 goto out; 3389 3390 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3391 GFP_NOFS); 3392 if (!t_bhs) { 3393 ret = -ENOMEM; 3394 goto out; 3395 } 3396 3397 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new); 3398 if (ret) 3399 goto out; 3400 3401 for (i = 0; i < blk_per_bucket; i++) { 3402 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3403 OCFS2_JOURNAL_ACCESS_WRITE); 3404 if (ret) 3405 goto out; 3406 } 3407 3408 for (i = 0; i < blk_per_bucket; i++) { 3409 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3410 ocfs2_journal_dirty(handle, t_bhs[i]); 3411 } 3412 3413 out: 3414 if (s_bhs) { 3415 for (i = 0; i < blk_per_bucket; i++) 3416 brelse(s_bhs[i]); 3417 } 3418 kfree(s_bhs); 3419 3420 if (t_bhs) { 3421 for (i = 0; i < blk_per_bucket; i++) 3422 brelse(t_bhs[i]); 3423 } 3424 kfree(t_bhs); 3425 3426 return ret; 3427 } 3428 3429 /* 3430 * Copy one xattr cluster from src_blk to to_blk. 3431 * The to_blk will become the first bucket header of the cluster, so its 3432 * xh_num_buckets will be initialized as the bucket num in the cluster. 3433 */ 3434 static int ocfs2_cp_xattr_cluster(struct inode *inode, 3435 handle_t *handle, 3436 struct buffer_head *first_bh, 3437 u64 src_blk, 3438 u64 to_blk, 3439 u32 *first_hash) 3440 { 3441 int i, ret, credits; 3442 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3443 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3444 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3445 struct buffer_head *bh = NULL; 3446 struct ocfs2_xattr_header *xh; 3447 u64 to_blk_start = to_blk; 3448 3449 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk); 3450 3451 /* 3452 * We need to update the new cluster and 1 more for the update of 3453 * the 1st bucket of the previous extent rec. 3454 */ 3455 credits = bpc + 1; 3456 ret = ocfs2_extend_trans(handle, credits); 3457 if (ret) { 3458 mlog_errno(ret); 3459 goto out; 3460 } 3461 3462 ret = ocfs2_journal_access(handle, inode, first_bh, 3463 OCFS2_JOURNAL_ACCESS_WRITE); 3464 if (ret) { 3465 mlog_errno(ret); 3466 goto out; 3467 } 3468 3469 for (i = 0; i < num_buckets; i++) { 3470 ret = ocfs2_cp_xattr_bucket(inode, handle, 3471 src_blk, to_blk, 1); 3472 if (ret) { 3473 mlog_errno(ret); 3474 goto out; 3475 } 3476 3477 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3478 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3479 } 3480 3481 /* update the old bucket header. */ 3482 xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3483 le16_add_cpu(&xh->xh_num_buckets, -num_buckets); 3484 3485 ocfs2_journal_dirty(handle, first_bh); 3486 3487 /* update the new bucket header. */ 3488 ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode); 3489 if (ret < 0) { 3490 mlog_errno(ret); 3491 goto out; 3492 } 3493 3494 ret = ocfs2_journal_access(handle, inode, bh, 3495 OCFS2_JOURNAL_ACCESS_WRITE); 3496 if (ret) { 3497 mlog_errno(ret); 3498 goto out; 3499 } 3500 3501 xh = (struct ocfs2_xattr_header *)bh->b_data; 3502 xh->xh_num_buckets = cpu_to_le16(num_buckets); 3503 3504 ocfs2_journal_dirty(handle, bh); 3505 3506 if (first_hash) 3507 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3508 out: 3509 brelse(bh); 3510 return ret; 3511 } 3512 3513 /* 3514 * Move half of the xattrs in this cluster to the new cluster. 3515 * This function should only be called when bucket size == cluster size. 3516 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead. 3517 */ 3518 static int ocfs2_half_xattr_cluster(struct inode *inode, 3519 handle_t *handle, 3520 u64 prev_blk, 3521 u64 new_blk, 3522 u32 *first_hash) 3523 { 3524 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3525 int ret, credits = 2 * blk_per_bucket; 3526 3527 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize); 3528 3529 ret = ocfs2_extend_trans(handle, credits); 3530 if (ret) { 3531 mlog_errno(ret); 3532 return ret; 3533 } 3534 3535 /* Move half of the xattr in start_blk to the next bucket. */ 3536 return ocfs2_half_xattr_bucket(inode, handle, prev_blk, 3537 new_blk, first_hash, 1); 3538 } 3539 3540 /* 3541 * Move some xattrs from the old cluster to the new one since they are not 3542 * contiguous in ocfs2 xattr tree. 3543 * 3544 * new_blk starts a new separate cluster, and we will move some xattrs from 3545 * prev_blk to it. v_start will be set as the first name hash value in this 3546 * new cluster so that it can be used as e_cpos during tree insertion and 3547 * don't collide with our original b-tree operations. first_bh and header_bh 3548 * will also be updated since they will be used in ocfs2_extend_xattr_bucket 3549 * to extend the insert bucket. 3550 * 3551 * The problem is how much xattr should we move to the new one and when should 3552 * we update first_bh and header_bh? 3553 * 1. If cluster size > bucket size, that means the previous cluster has more 3554 * than 1 bucket, so just move half nums of bucket into the new cluster and 3555 * update the first_bh and header_bh if the insert bucket has been moved 3556 * to the new cluster. 3557 * 2. If cluster_size == bucket_size: 3558 * a) If the previous extent rec has more than one cluster and the insert 3559 * place isn't in the last cluster, copy the entire last cluster to the 3560 * new one. This time, we don't need to upate the first_bh and header_bh 3561 * since they will not be moved into the new cluster. 3562 * b) Otherwise, move the bottom half of the xattrs in the last cluster into 3563 * the new one. And we set the extend flag to zero if the insert place is 3564 * moved into the new allocated cluster since no extend is needed. 3565 */ 3566 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode, 3567 handle_t *handle, 3568 struct buffer_head **first_bh, 3569 struct buffer_head **header_bh, 3570 u64 new_blk, 3571 u64 prev_blk, 3572 u32 prev_clusters, 3573 u32 *v_start, 3574 int *extend) 3575 { 3576 int ret = 0; 3577 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3578 3579 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n", 3580 prev_blk, prev_clusters, new_blk); 3581 3582 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) 3583 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode, 3584 handle, 3585 first_bh, 3586 header_bh, 3587 new_blk, 3588 prev_blk, 3589 prev_clusters, 3590 v_start); 3591 else { 3592 u64 last_blk = prev_blk + bpc * (prev_clusters - 1); 3593 3594 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk) 3595 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh, 3596 last_blk, new_blk, 3597 v_start); 3598 else { 3599 ret = ocfs2_half_xattr_cluster(inode, handle, 3600 last_blk, new_blk, 3601 v_start); 3602 3603 if ((*header_bh)->b_blocknr == last_blk && extend) 3604 *extend = 0; 3605 } 3606 } 3607 3608 return ret; 3609 } 3610 3611 /* 3612 * Add a new cluster for xattr storage. 3613 * 3614 * If the new cluster is contiguous with the previous one, it will be 3615 * appended to the same extent record, and num_clusters will be updated. 3616 * If not, we will insert a new extent for it and move some xattrs in 3617 * the last cluster into the new allocated one. 3618 * We also need to limit the maximum size of a btree leaf, otherwise we'll 3619 * lose the benefits of hashing because we'll have to search large leaves. 3620 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize, 3621 * if it's bigger). 3622 * 3623 * first_bh is the first block of the previous extent rec and header_bh 3624 * indicates the bucket we will insert the new xattrs. They will be updated 3625 * when the header_bh is moved into the new cluster. 3626 */ 3627 static int ocfs2_add_new_xattr_cluster(struct inode *inode, 3628 struct buffer_head *root_bh, 3629 struct buffer_head **first_bh, 3630 struct buffer_head **header_bh, 3631 u32 *num_clusters, 3632 u32 prev_cpos, 3633 u64 prev_blkno, 3634 int *extend) 3635 { 3636 int ret, credits; 3637 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3638 u32 prev_clusters = *num_clusters; 3639 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0; 3640 u64 block; 3641 handle_t *handle = NULL; 3642 struct ocfs2_alloc_context *data_ac = NULL; 3643 struct ocfs2_alloc_context *meta_ac = NULL; 3644 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3645 struct ocfs2_extent_tree et; 3646 3647 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, " 3648 "previous xattr blkno = %llu\n", 3649 (unsigned long long)OCFS2_I(inode)->ip_blkno, 3650 prev_cpos, prev_blkno); 3651 3652 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh); 3653 3654 ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, 3655 &data_ac, &meta_ac); 3656 if (ret) { 3657 mlog_errno(ret); 3658 goto leave; 3659 } 3660 3661 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el, 3662 clusters_to_add); 3663 handle = ocfs2_start_trans(osb, credits); 3664 if (IS_ERR(handle)) { 3665 ret = PTR_ERR(handle); 3666 handle = NULL; 3667 mlog_errno(ret); 3668 goto leave; 3669 } 3670 3671 ret = ocfs2_journal_access(handle, inode, root_bh, 3672 OCFS2_JOURNAL_ACCESS_WRITE); 3673 if (ret < 0) { 3674 mlog_errno(ret); 3675 goto leave; 3676 } 3677 3678 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1, 3679 clusters_to_add, &bit_off, &num_bits); 3680 if (ret < 0) { 3681 if (ret != -ENOSPC) 3682 mlog_errno(ret); 3683 goto leave; 3684 } 3685 3686 BUG_ON(num_bits > clusters_to_add); 3687 3688 block = ocfs2_clusters_to_blocks(osb->sb, bit_off); 3689 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n", 3690 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); 3691 3692 if (prev_blkno + prev_clusters * bpc == block && 3693 (prev_clusters + num_bits) << osb->s_clustersize_bits <= 3694 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) { 3695 /* 3696 * If this cluster is contiguous with the old one and 3697 * adding this new cluster, we don't surpass the limit of 3698 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be 3699 * initialized and used like other buckets in the previous 3700 * cluster. 3701 * So add it as a contiguous one. The caller will handle 3702 * its init process. 3703 */ 3704 v_start = prev_cpos + prev_clusters; 3705 *num_clusters = prev_clusters + num_bits; 3706 mlog(0, "Add contiguous %u clusters to previous extent rec.\n", 3707 num_bits); 3708 } else { 3709 ret = ocfs2_adjust_xattr_cross_cluster(inode, 3710 handle, 3711 first_bh, 3712 header_bh, 3713 block, 3714 prev_blkno, 3715 prev_clusters, 3716 &v_start, 3717 extend); 3718 if (ret) { 3719 mlog_errno(ret); 3720 goto leave; 3721 } 3722 } 3723 3724 if (handle->h_buffer_credits < credits) { 3725 /* 3726 * The journal has been restarted before, and don't 3727 * have enough space for the insertion, so extend it 3728 * here. 3729 */ 3730 ret = ocfs2_extend_trans(handle, credits); 3731 if (ret) { 3732 mlog_errno(ret); 3733 goto leave; 3734 } 3735 } 3736 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n", 3737 num_bits, block, v_start); 3738 ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block, 3739 num_bits, 0, meta_ac); 3740 if (ret < 0) { 3741 mlog_errno(ret); 3742 goto leave; 3743 } 3744 3745 ret = ocfs2_journal_dirty(handle, root_bh); 3746 if (ret < 0) { 3747 mlog_errno(ret); 3748 goto leave; 3749 } 3750 3751 leave: 3752 if (handle) 3753 ocfs2_commit_trans(osb, handle); 3754 if (data_ac) 3755 ocfs2_free_alloc_context(data_ac); 3756 if (meta_ac) 3757 ocfs2_free_alloc_context(meta_ac); 3758 3759 return ret; 3760 } 3761 3762 /* 3763 * Extend a new xattr bucket and move xattrs to the end one by one until 3764 * We meet with start_bh. Only move half of the xattrs to the bucket after it. 3765 */ 3766 static int ocfs2_extend_xattr_bucket(struct inode *inode, 3767 struct buffer_head *first_bh, 3768 struct buffer_head *start_bh, 3769 u32 num_clusters) 3770 { 3771 int ret, credits; 3772 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3773 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3774 u64 start_blk = start_bh->b_blocknr, end_blk; 3775 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb); 3776 handle_t *handle; 3777 struct ocfs2_xattr_header *first_xh = 3778 (struct ocfs2_xattr_header *)first_bh->b_data; 3779 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets); 3780 3781 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting " 3782 "from %llu, len = %u\n", start_blk, 3783 (unsigned long long)first_bh->b_blocknr, num_clusters); 3784 3785 BUG_ON(bucket >= num_buckets); 3786 3787 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket; 3788 3789 /* 3790 * We will touch all the buckets after the start_bh(include it). 3791 * Add one more bucket and modify the first_bh. 3792 */ 3793 credits = end_blk - start_blk + 2 * blk_per_bucket + 1; 3794 handle = ocfs2_start_trans(osb, credits); 3795 if (IS_ERR(handle)) { 3796 ret = PTR_ERR(handle); 3797 handle = NULL; 3798 mlog_errno(ret); 3799 goto out; 3800 } 3801 3802 ret = ocfs2_journal_access(handle, inode, first_bh, 3803 OCFS2_JOURNAL_ACCESS_WRITE); 3804 if (ret) { 3805 mlog_errno(ret); 3806 goto commit; 3807 } 3808 3809 while (end_blk != start_blk) { 3810 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk, 3811 end_blk + blk_per_bucket, 0); 3812 if (ret) 3813 goto commit; 3814 end_blk -= blk_per_bucket; 3815 } 3816 3817 /* Move half of the xattr in start_blk to the next bucket. */ 3818 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk, 3819 start_blk + blk_per_bucket, NULL, 0); 3820 3821 le16_add_cpu(&first_xh->xh_num_buckets, 1); 3822 ocfs2_journal_dirty(handle, first_bh); 3823 3824 commit: 3825 ocfs2_commit_trans(osb, handle); 3826 out: 3827 return ret; 3828 } 3829 3830 /* 3831 * Add new xattr bucket in an extent record and adjust the buckets accordingly. 3832 * xb_bh is the ocfs2_xattr_block. 3833 * We will move all the buckets starting from header_bh to the next place. As 3834 * for this one, half num of its xattrs will be moved to the next one. 3835 * 3836 * We will allocate a new cluster if current cluster is full and adjust 3837 * header_bh and first_bh if the insert place is moved to the new cluster. 3838 */ 3839 static int ocfs2_add_new_xattr_bucket(struct inode *inode, 3840 struct buffer_head *xb_bh, 3841 struct buffer_head *header_bh) 3842 { 3843 struct ocfs2_xattr_header *first_xh = NULL; 3844 struct buffer_head *first_bh = NULL; 3845 struct ocfs2_xattr_block *xb = 3846 (struct ocfs2_xattr_block *)xb_bh->b_data; 3847 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 3848 struct ocfs2_extent_list *el = &xb_root->xt_list; 3849 struct ocfs2_xattr_header *xh = 3850 (struct ocfs2_xattr_header *)header_bh->b_data; 3851 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3852 struct super_block *sb = inode->i_sb; 3853 struct ocfs2_super *osb = OCFS2_SB(sb); 3854 int ret, num_buckets, extend = 1; 3855 u64 p_blkno; 3856 u32 e_cpos, num_clusters; 3857 3858 mlog(0, "Add new xattr bucket starting form %llu\n", 3859 (unsigned long long)header_bh->b_blocknr); 3860 3861 /* 3862 * Add refrence for header_bh here because it may be 3863 * changed in ocfs2_add_new_xattr_cluster and we need 3864 * to free it in the end. 3865 */ 3866 get_bh(header_bh); 3867 3868 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos, 3869 &num_clusters, el); 3870 if (ret) { 3871 mlog_errno(ret); 3872 goto out; 3873 } 3874 3875 ret = ocfs2_read_block(osb, p_blkno, 3876 &first_bh, OCFS2_BH_CACHED, inode); 3877 if (ret) { 3878 mlog_errno(ret); 3879 goto out; 3880 } 3881 3882 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters; 3883 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3884 3885 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) { 3886 ret = ocfs2_add_new_xattr_cluster(inode, 3887 xb_bh, 3888 &first_bh, 3889 &header_bh, 3890 &num_clusters, 3891 e_cpos, 3892 p_blkno, 3893 &extend); 3894 if (ret) { 3895 mlog_errno(ret); 3896 goto out; 3897 } 3898 } 3899 3900 if (extend) 3901 ret = ocfs2_extend_xattr_bucket(inode, 3902 first_bh, 3903 header_bh, 3904 num_clusters); 3905 if (ret) 3906 mlog_errno(ret); 3907 out: 3908 brelse(first_bh); 3909 brelse(header_bh); 3910 return ret; 3911 } 3912 3913 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode, 3914 struct ocfs2_xattr_bucket *bucket, 3915 int offs) 3916 { 3917 int block_off = offs >> inode->i_sb->s_blocksize_bits; 3918 3919 offs = offs % inode->i_sb->s_blocksize; 3920 return bucket->bhs[block_off]->b_data + offs; 3921 } 3922 3923 /* 3924 * Handle the normal xattr set, including replace, delete and new. 3925 * 3926 * Note: "local" indicates the real data's locality. So we can't 3927 * just its bucket locality by its length. 3928 */ 3929 static void ocfs2_xattr_set_entry_normal(struct inode *inode, 3930 struct ocfs2_xattr_info *xi, 3931 struct ocfs2_xattr_search *xs, 3932 u32 name_hash, 3933 int local) 3934 { 3935 struct ocfs2_xattr_entry *last, *xe; 3936 int name_len = strlen(xi->name); 3937 struct ocfs2_xattr_header *xh = xs->header; 3938 u16 count = le16_to_cpu(xh->xh_count), start; 3939 size_t blocksize = inode->i_sb->s_blocksize; 3940 char *val; 3941 size_t offs, size, new_size; 3942 3943 last = &xh->xh_entries[count]; 3944 if (!xs->not_found) { 3945 xe = xs->here; 3946 offs = le16_to_cpu(xe->xe_name_offset); 3947 if (ocfs2_xattr_is_local(xe)) 3948 size = OCFS2_XATTR_SIZE(name_len) + 3949 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3950 else 3951 size = OCFS2_XATTR_SIZE(name_len) + 3952 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 3953 3954 /* 3955 * If the new value will be stored outside, xi->value has been 3956 * initalized as an empty ocfs2_xattr_value_root, and the same 3957 * goes with xi->value_len, so we can set new_size safely here. 3958 * See ocfs2_xattr_set_in_bucket. 3959 */ 3960 new_size = OCFS2_XATTR_SIZE(name_len) + 3961 OCFS2_XATTR_SIZE(xi->value_len); 3962 3963 le16_add_cpu(&xh->xh_name_value_len, -size); 3964 if (xi->value) { 3965 if (new_size > size) 3966 goto set_new_name_value; 3967 3968 /* Now replace the old value with new one. */ 3969 if (local) 3970 xe->xe_value_size = cpu_to_le64(xi->value_len); 3971 else 3972 xe->xe_value_size = 0; 3973 3974 val = ocfs2_xattr_bucket_get_val(inode, 3975 &xs->bucket, offs); 3976 memset(val + OCFS2_XATTR_SIZE(name_len), 0, 3977 size - OCFS2_XATTR_SIZE(name_len)); 3978 if (OCFS2_XATTR_SIZE(xi->value_len) > 0) 3979 memcpy(val + OCFS2_XATTR_SIZE(name_len), 3980 xi->value, xi->value_len); 3981 3982 le16_add_cpu(&xh->xh_name_value_len, new_size); 3983 ocfs2_xattr_set_local(xe, local); 3984 return; 3985 } else { 3986 /* 3987 * Remove the old entry if there is more than one. 3988 * We don't remove the last entry so that we can 3989 * use it to indicate the hash value of the empty 3990 * bucket. 3991 */ 3992 last -= 1; 3993 le16_add_cpu(&xh->xh_count, -1); 3994 if (xh->xh_count) { 3995 memmove(xe, xe + 1, 3996 (void *)last - (void *)xe); 3997 memset(last, 0, 3998 sizeof(struct ocfs2_xattr_entry)); 3999 } else 4000 xh->xh_free_start = 4001 cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); 4002 4003 return; 4004 } 4005 } else { 4006 /* find a new entry for insert. */ 4007 int low = 0, high = count - 1, tmp; 4008 struct ocfs2_xattr_entry *tmp_xe; 4009 4010 while (low <= high && count) { 4011 tmp = (low + high) / 2; 4012 tmp_xe = &xh->xh_entries[tmp]; 4013 4014 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash)) 4015 low = tmp + 1; 4016 else if (name_hash < 4017 le32_to_cpu(tmp_xe->xe_name_hash)) 4018 high = tmp - 1; 4019 else { 4020 low = tmp; 4021 break; 4022 } 4023 } 4024 4025 xe = &xh->xh_entries[low]; 4026 if (low != count) 4027 memmove(xe + 1, xe, (void *)last - (void *)xe); 4028 4029 le16_add_cpu(&xh->xh_count, 1); 4030 memset(xe, 0, sizeof(struct ocfs2_xattr_entry)); 4031 xe->xe_name_hash = cpu_to_le32(name_hash); 4032 xe->xe_name_len = name_len; 4033 ocfs2_xattr_set_type(xe, xi->name_index); 4034 } 4035 4036 set_new_name_value: 4037 /* Insert the new name+value. */ 4038 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len); 4039 4040 /* 4041 * We must make sure that the name/value pair 4042 * exists in the same block. 4043 */ 4044 offs = le16_to_cpu(xh->xh_free_start); 4045 start = offs - size; 4046 4047 if (start >> inode->i_sb->s_blocksize_bits != 4048 (offs - 1) >> inode->i_sb->s_blocksize_bits) { 4049 offs = offs - offs % blocksize; 4050 xh->xh_free_start = cpu_to_le16(offs); 4051 } 4052 4053 val = ocfs2_xattr_bucket_get_val(inode, 4054 &xs->bucket, offs - size); 4055 xe->xe_name_offset = cpu_to_le16(offs - size); 4056 4057 memset(val, 0, size); 4058 memcpy(val, xi->name, name_len); 4059 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); 4060 4061 xe->xe_value_size = cpu_to_le64(xi->value_len); 4062 ocfs2_xattr_set_local(xe, local); 4063 xs->here = xe; 4064 le16_add_cpu(&xh->xh_free_start, -size); 4065 le16_add_cpu(&xh->xh_name_value_len, size); 4066 4067 return; 4068 } 4069 4070 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode, 4071 handle_t *handle, 4072 struct ocfs2_xattr_search *xs, 4073 struct buffer_head **bhs, 4074 u16 bh_num) 4075 { 4076 int ret = 0, off, block_off; 4077 struct ocfs2_xattr_entry *xe = xs->here; 4078 4079 /* 4080 * First calculate all the blocks we should journal_access 4081 * and journal_dirty. The first block should always be touched. 4082 */ 4083 ret = ocfs2_journal_dirty(handle, bhs[0]); 4084 if (ret) 4085 mlog_errno(ret); 4086 4087 /* calc the data. */ 4088 off = le16_to_cpu(xe->xe_name_offset); 4089 block_off = off >> inode->i_sb->s_blocksize_bits; 4090 ret = ocfs2_journal_dirty(handle, bhs[block_off]); 4091 if (ret) 4092 mlog_errno(ret); 4093 4094 return ret; 4095 } 4096 4097 /* 4098 * Set the xattr entry in the specified bucket. 4099 * The bucket is indicated by xs->bucket and it should have the enough 4100 * space for the xattr insertion. 4101 */ 4102 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode, 4103 struct ocfs2_xattr_info *xi, 4104 struct ocfs2_xattr_search *xs, 4105 u32 name_hash, 4106 int local) 4107 { 4108 int i, ret; 4109 handle_t *handle = NULL; 4110 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4111 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4112 4113 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n", 4114 (unsigned long)xi->value_len, xi->name_index, 4115 (unsigned long long)xs->bucket.bhs[0]->b_blocknr); 4116 4117 if (!xs->bucket.bhs[1]) { 4118 ret = ocfs2_read_blocks(osb, 4119 xs->bucket.bhs[0]->b_blocknr + 1, 4120 blk_per_bucket - 1, &xs->bucket.bhs[1], 4121 OCFS2_BH_CACHED, inode); 4122 if (ret) { 4123 mlog_errno(ret); 4124 goto out; 4125 } 4126 } 4127 4128 handle = ocfs2_start_trans(osb, blk_per_bucket); 4129 if (IS_ERR(handle)) { 4130 ret = PTR_ERR(handle); 4131 handle = NULL; 4132 mlog_errno(ret); 4133 goto out; 4134 } 4135 4136 for (i = 0; i < blk_per_bucket; i++) { 4137 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i], 4138 OCFS2_JOURNAL_ACCESS_WRITE); 4139 if (ret < 0) { 4140 mlog_errno(ret); 4141 goto out; 4142 } 4143 } 4144 4145 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local); 4146 4147 /*Only dirty the blocks we have touched in set xattr. */ 4148 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs, 4149 xs->bucket.bhs, blk_per_bucket); 4150 if (ret) 4151 mlog_errno(ret); 4152 out: 4153 ocfs2_commit_trans(osb, handle); 4154 4155 return ret; 4156 } 4157 4158 static int ocfs2_xattr_value_update_size(struct inode *inode, 4159 struct buffer_head *xe_bh, 4160 struct ocfs2_xattr_entry *xe, 4161 u64 new_size) 4162 { 4163 int ret; 4164 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4165 handle_t *handle = NULL; 4166 4167 handle = ocfs2_start_trans(osb, 1); 4168 if (handle == NULL) { 4169 ret = -ENOMEM; 4170 mlog_errno(ret); 4171 goto out; 4172 } 4173 4174 ret = ocfs2_journal_access(handle, inode, xe_bh, 4175 OCFS2_JOURNAL_ACCESS_WRITE); 4176 if (ret < 0) { 4177 mlog_errno(ret); 4178 goto out_commit; 4179 } 4180 4181 xe->xe_value_size = cpu_to_le64(new_size); 4182 4183 ret = ocfs2_journal_dirty(handle, xe_bh); 4184 if (ret < 0) 4185 mlog_errno(ret); 4186 4187 out_commit: 4188 ocfs2_commit_trans(osb, handle); 4189 out: 4190 return ret; 4191 } 4192 4193 /* 4194 * Truncate the specified xe_off entry in xattr bucket. 4195 * bucket is indicated by header_bh and len is the new length. 4196 * Both the ocfs2_xattr_value_root and the entry will be updated here. 4197 * 4198 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed. 4199 */ 4200 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode, 4201 struct buffer_head *header_bh, 4202 int xe_off, 4203 int len) 4204 { 4205 int ret, offset; 4206 u64 value_blk; 4207 struct buffer_head *value_bh = NULL; 4208 struct ocfs2_xattr_value_root *xv; 4209 struct ocfs2_xattr_entry *xe; 4210 struct ocfs2_xattr_header *xh = 4211 (struct ocfs2_xattr_header *)header_bh->b_data; 4212 size_t blocksize = inode->i_sb->s_blocksize; 4213 4214 xe = &xh->xh_entries[xe_off]; 4215 4216 BUG_ON(!xe || ocfs2_xattr_is_local(xe)); 4217 4218 offset = le16_to_cpu(xe->xe_name_offset) + 4219 OCFS2_XATTR_SIZE(xe->xe_name_len); 4220 4221 value_blk = offset / blocksize; 4222 4223 /* We don't allow ocfs2_xattr_value to be stored in different block. */ 4224 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize); 4225 value_blk += header_bh->b_blocknr; 4226 4227 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk, 4228 &value_bh, OCFS2_BH_CACHED, inode); 4229 if (ret) { 4230 mlog_errno(ret); 4231 goto out; 4232 } 4233 4234 xv = (struct ocfs2_xattr_value_root *) 4235 (value_bh->b_data + offset % blocksize); 4236 4237 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n", 4238 xe_off, (unsigned long long)header_bh->b_blocknr, len); 4239 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len); 4240 if (ret) { 4241 mlog_errno(ret); 4242 goto out; 4243 } 4244 4245 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len); 4246 if (ret) { 4247 mlog_errno(ret); 4248 goto out; 4249 } 4250 4251 out: 4252 brelse(value_bh); 4253 return ret; 4254 } 4255 4256 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode, 4257 struct ocfs2_xattr_search *xs, 4258 int len) 4259 { 4260 int ret, offset; 4261 struct ocfs2_xattr_entry *xe = xs->here; 4262 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base; 4263 4264 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe)); 4265 4266 offset = xe - xh->xh_entries; 4267 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0], 4268 offset, len); 4269 if (ret) 4270 mlog_errno(ret); 4271 4272 return ret; 4273 } 4274 4275 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode, 4276 struct ocfs2_xattr_search *xs, 4277 char *val, 4278 int value_len) 4279 { 4280 int offset; 4281 struct ocfs2_xattr_value_root *xv; 4282 struct ocfs2_xattr_entry *xe = xs->here; 4283 4284 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe)); 4285 4286 offset = le16_to_cpu(xe->xe_name_offset) + 4287 OCFS2_XATTR_SIZE(xe->xe_name_len); 4288 4289 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset); 4290 4291 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len); 4292 } 4293 4294 static int ocfs2_rm_xattr_cluster(struct inode *inode, 4295 struct buffer_head *root_bh, 4296 u64 blkno, 4297 u32 cpos, 4298 u32 len) 4299 { 4300 int ret; 4301 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4302 struct inode *tl_inode = osb->osb_tl_inode; 4303 handle_t *handle; 4304 struct ocfs2_xattr_block *xb = 4305 (struct ocfs2_xattr_block *)root_bh->b_data; 4306 struct ocfs2_alloc_context *meta_ac = NULL; 4307 struct ocfs2_cached_dealloc_ctxt dealloc; 4308 struct ocfs2_extent_tree et; 4309 4310 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh); 4311 4312 ocfs2_init_dealloc_ctxt(&dealloc); 4313 4314 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n", 4315 cpos, len, (unsigned long long)blkno); 4316 4317 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len); 4318 4319 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac); 4320 if (ret) { 4321 mlog_errno(ret); 4322 return ret; 4323 } 4324 4325 mutex_lock(&tl_inode->i_mutex); 4326 4327 if (ocfs2_truncate_log_needs_flush(osb)) { 4328 ret = __ocfs2_flush_truncate_log(osb); 4329 if (ret < 0) { 4330 mlog_errno(ret); 4331 goto out; 4332 } 4333 } 4334 4335 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 4336 if (handle == NULL) { 4337 ret = -ENOMEM; 4338 mlog_errno(ret); 4339 goto out; 4340 } 4341 4342 ret = ocfs2_journal_access(handle, inode, root_bh, 4343 OCFS2_JOURNAL_ACCESS_WRITE); 4344 if (ret) { 4345 mlog_errno(ret); 4346 goto out_commit; 4347 } 4348 4349 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac, 4350 &dealloc); 4351 if (ret) { 4352 mlog_errno(ret); 4353 goto out_commit; 4354 } 4355 4356 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len); 4357 4358 ret = ocfs2_journal_dirty(handle, root_bh); 4359 if (ret) { 4360 mlog_errno(ret); 4361 goto out_commit; 4362 } 4363 4364 ret = ocfs2_truncate_log_append(osb, handle, blkno, len); 4365 if (ret) 4366 mlog_errno(ret); 4367 4368 out_commit: 4369 ocfs2_commit_trans(osb, handle); 4370 out: 4371 ocfs2_schedule_truncate_log_flush(osb, 1); 4372 4373 mutex_unlock(&tl_inode->i_mutex); 4374 4375 if (meta_ac) 4376 ocfs2_free_alloc_context(meta_ac); 4377 4378 ocfs2_run_deallocs(osb, &dealloc); 4379 4380 return ret; 4381 } 4382 4383 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode, 4384 struct ocfs2_xattr_search *xs) 4385 { 4386 handle_t *handle = NULL; 4387 struct ocfs2_xattr_header *xh = xs->bucket.xh; 4388 struct ocfs2_xattr_entry *last = &xh->xh_entries[ 4389 le16_to_cpu(xh->xh_count) - 1]; 4390 int ret = 0; 4391 4392 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1); 4393 if (IS_ERR(handle)) { 4394 ret = PTR_ERR(handle); 4395 mlog_errno(ret); 4396 return; 4397 } 4398 4399 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0], 4400 OCFS2_JOURNAL_ACCESS_WRITE); 4401 if (ret) { 4402 mlog_errno(ret); 4403 goto out_commit; 4404 } 4405 4406 /* Remove the old entry. */ 4407 memmove(xs->here, xs->here + 1, 4408 (void *)last - (void *)xs->here); 4409 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 4410 le16_add_cpu(&xh->xh_count, -1); 4411 4412 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]); 4413 if (ret < 0) 4414 mlog_errno(ret); 4415 out_commit: 4416 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 4417 } 4418 4419 /* 4420 * Set the xattr name/value in the bucket specified in xs. 4421 * 4422 * As the new value in xi may be stored in the bucket or in an outside cluster, 4423 * we divide the whole process into 3 steps: 4424 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket) 4425 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs) 4426 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside) 4427 * 4. If the clusters for the new outside value can't be allocated, we need 4428 * to free the xattr we allocated in set. 4429 */ 4430 static int ocfs2_xattr_set_in_bucket(struct inode *inode, 4431 struct ocfs2_xattr_info *xi, 4432 struct ocfs2_xattr_search *xs) 4433 { 4434 int ret, local = 1; 4435 size_t value_len; 4436 char *val = (char *)xi->value; 4437 struct ocfs2_xattr_entry *xe = xs->here; 4438 u32 name_hash = ocfs2_xattr_hash_by_name(inode, 4439 xi->name_index, xi->name); 4440 4441 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) { 4442 /* 4443 * We need to truncate the xattr storage first. 4444 * 4445 * If both the old and new value are stored to 4446 * outside block, we only need to truncate 4447 * the storage and then set the value outside. 4448 * 4449 * If the new value should be stored within block, 4450 * we should free all the outside block first and 4451 * the modification to the xattr block will be done 4452 * by following steps. 4453 */ 4454 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4455 value_len = xi->value_len; 4456 else 4457 value_len = 0; 4458 4459 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4460 value_len); 4461 if (ret) 4462 goto out; 4463 4464 if (value_len) 4465 goto set_value_outside; 4466 } 4467 4468 value_len = xi->value_len; 4469 /* So we have to handle the inside block change now. */ 4470 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4471 /* 4472 * If the new value will be stored outside of block, 4473 * initalize a new empty value root and insert it first. 4474 */ 4475 local = 0; 4476 xi->value = &def_xv; 4477 xi->value_len = OCFS2_XATTR_ROOT_SIZE; 4478 } 4479 4480 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local); 4481 if (ret) { 4482 mlog_errno(ret); 4483 goto out; 4484 } 4485 4486 if (value_len <= OCFS2_XATTR_INLINE_SIZE) 4487 goto out; 4488 4489 /* allocate the space now for the outside block storage. */ 4490 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4491 value_len); 4492 if (ret) { 4493 mlog_errno(ret); 4494 4495 if (xs->not_found) { 4496 /* 4497 * We can't allocate enough clusters for outside 4498 * storage and we have allocated xattr already, 4499 * so need to remove it. 4500 */ 4501 ocfs2_xattr_bucket_remove_xs(inode, xs); 4502 } 4503 goto out; 4504 } 4505 4506 set_value_outside: 4507 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len); 4508 out: 4509 return ret; 4510 } 4511 4512 /* check whether the xattr bucket is filled up with the same hash value. */ 4513 static int ocfs2_check_xattr_bucket_collision(struct inode *inode, 4514 struct ocfs2_xattr_bucket *bucket) 4515 { 4516 struct ocfs2_xattr_header *xh = bucket->xh; 4517 4518 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash == 4519 xh->xh_entries[0].xe_name_hash) { 4520 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, " 4521 "hash = %u\n", 4522 (unsigned long long)bucket->bhs[0]->b_blocknr, 4523 le32_to_cpu(xh->xh_entries[0].xe_name_hash)); 4524 return -ENOSPC; 4525 } 4526 4527 return 0; 4528 } 4529 4530 static int ocfs2_xattr_set_entry_index_block(struct inode *inode, 4531 struct ocfs2_xattr_info *xi, 4532 struct ocfs2_xattr_search *xs) 4533 { 4534 struct ocfs2_xattr_header *xh; 4535 struct ocfs2_xattr_entry *xe; 4536 u16 count, header_size, xh_free_start; 4537 int i, free, max_free, need, old; 4538 size_t value_size = 0, name_len = strlen(xi->name); 4539 size_t blocksize = inode->i_sb->s_blocksize; 4540 int ret, allocation = 0; 4541 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4542 4543 mlog_entry("Set xattr %s in xattr index block\n", xi->name); 4544 4545 try_again: 4546 xh = xs->header; 4547 count = le16_to_cpu(xh->xh_count); 4548 xh_free_start = le16_to_cpu(xh->xh_free_start); 4549 header_size = sizeof(struct ocfs2_xattr_header) + 4550 count * sizeof(struct ocfs2_xattr_entry); 4551 max_free = OCFS2_XATTR_BUCKET_SIZE - 4552 le16_to_cpu(xh->xh_name_value_len) - header_size; 4553 4554 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size " 4555 "of %u which exceed block size\n", 4556 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4557 header_size); 4558 4559 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4560 value_size = OCFS2_XATTR_ROOT_SIZE; 4561 else if (xi->value) 4562 value_size = OCFS2_XATTR_SIZE(xi->value_len); 4563 4564 if (xs->not_found) 4565 need = sizeof(struct ocfs2_xattr_entry) + 4566 OCFS2_XATTR_SIZE(name_len) + value_size; 4567 else { 4568 need = value_size + OCFS2_XATTR_SIZE(name_len); 4569 4570 /* 4571 * We only replace the old value if the new length is smaller 4572 * than the old one. Otherwise we will allocate new space in the 4573 * bucket to store it. 4574 */ 4575 xe = xs->here; 4576 if (ocfs2_xattr_is_local(xe)) 4577 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 4578 else 4579 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 4580 4581 if (old >= value_size) 4582 need = 0; 4583 } 4584 4585 free = xh_free_start - header_size; 4586 /* 4587 * We need to make sure the new name/value pair 4588 * can exist in the same block. 4589 */ 4590 if (xh_free_start % blocksize < need) 4591 free -= xh_free_start % blocksize; 4592 4593 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, " 4594 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len =" 4595 " %u\n", xs->not_found, 4596 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4597 free, need, max_free, le16_to_cpu(xh->xh_free_start), 4598 le16_to_cpu(xh->xh_name_value_len)); 4599 4600 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4601 if (need <= max_free && 4602 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4603 /* 4604 * We can create the space by defragment. Since only the 4605 * name/value will be moved, the xe shouldn't be changed 4606 * in xs. 4607 */ 4608 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket); 4609 if (ret) { 4610 mlog_errno(ret); 4611 goto out; 4612 } 4613 4614 xh_free_start = le16_to_cpu(xh->xh_free_start); 4615 free = xh_free_start - header_size; 4616 if (xh_free_start % blocksize < need) 4617 free -= xh_free_start % blocksize; 4618 4619 if (free >= need) 4620 goto xattr_set; 4621 4622 mlog(0, "Can't get enough space for xattr insert by " 4623 "defragment. Need %u bytes, but we have %d, so " 4624 "allocate new bucket for it.\n", need, free); 4625 } 4626 4627 /* 4628 * We have to add new buckets or clusters and one 4629 * allocation should leave us enough space for insert. 4630 */ 4631 BUG_ON(allocation); 4632 4633 /* 4634 * We do not allow for overlapping ranges between buckets. And 4635 * the maximum number of collisions we will allow for then is 4636 * one bucket's worth, so check it here whether we need to 4637 * add a new bucket for the insert. 4638 */ 4639 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket); 4640 if (ret) { 4641 mlog_errno(ret); 4642 goto out; 4643 } 4644 4645 ret = ocfs2_add_new_xattr_bucket(inode, 4646 xs->xattr_bh, 4647 xs->bucket.bhs[0]); 4648 if (ret) { 4649 mlog_errno(ret); 4650 goto out; 4651 } 4652 4653 for (i = 0; i < blk_per_bucket; i++) 4654 brelse(xs->bucket.bhs[i]); 4655 4656 memset(&xs->bucket, 0, sizeof(xs->bucket)); 4657 4658 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh, 4659 xi->name_index, 4660 xi->name, xs); 4661 if (ret && ret != -ENODATA) 4662 goto out; 4663 xs->not_found = ret; 4664 allocation = 1; 4665 goto try_again; 4666 } 4667 4668 xattr_set: 4669 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs); 4670 out: 4671 mlog_exit(ret); 4672 return ret; 4673 } 4674 4675 static int ocfs2_delete_xattr_in_bucket(struct inode *inode, 4676 struct ocfs2_xattr_bucket *bucket, 4677 void *para) 4678 { 4679 int ret = 0; 4680 struct ocfs2_xattr_header *xh = bucket->xh; 4681 u16 i; 4682 struct ocfs2_xattr_entry *xe; 4683 4684 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 4685 xe = &xh->xh_entries[i]; 4686 if (ocfs2_xattr_is_local(xe)) 4687 continue; 4688 4689 ret = ocfs2_xattr_bucket_value_truncate(inode, 4690 bucket->bhs[0], 4691 i, 0); 4692 if (ret) { 4693 mlog_errno(ret); 4694 break; 4695 } 4696 } 4697 4698 return ret; 4699 } 4700 4701 static int ocfs2_delete_xattr_index_block(struct inode *inode, 4702 struct buffer_head *xb_bh) 4703 { 4704 struct ocfs2_xattr_block *xb = 4705 (struct ocfs2_xattr_block *)xb_bh->b_data; 4706 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 4707 int ret = 0; 4708 u32 name_hash = UINT_MAX, e_cpos, num_clusters; 4709 u64 p_blkno; 4710 4711 if (le16_to_cpu(el->l_next_free_rec) == 0) 4712 return 0; 4713 4714 while (name_hash > 0) { 4715 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4716 &e_cpos, &num_clusters, el); 4717 if (ret) { 4718 mlog_errno(ret); 4719 goto out; 4720 } 4721 4722 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 4723 ocfs2_delete_xattr_in_bucket, 4724 NULL); 4725 if (ret) { 4726 mlog_errno(ret); 4727 goto out; 4728 } 4729 4730 ret = ocfs2_rm_xattr_cluster(inode, xb_bh, 4731 p_blkno, e_cpos, num_clusters); 4732 if (ret) { 4733 mlog_errno(ret); 4734 break; 4735 } 4736 4737 if (e_cpos == 0) 4738 break; 4739 4740 name_hash = e_cpos - 1; 4741 } 4742 4743 out: 4744 return ret; 4745 } 4746 4747 /* 4748 * 'trusted' attributes support 4749 */ 4750 4751 #define XATTR_TRUSTED_PREFIX "trusted." 4752 4753 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list, 4754 size_t list_size, const char *name, 4755 size_t name_len) 4756 { 4757 const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX) - 1; 4758 const size_t total_len = prefix_len + name_len + 1; 4759 4760 if (list && total_len <= list_size) { 4761 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); 4762 memcpy(list + prefix_len, name, name_len); 4763 list[prefix_len + name_len] = '\0'; 4764 } 4765 return total_len; 4766 } 4767 4768 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name, 4769 void *buffer, size_t size) 4770 { 4771 if (strcmp(name, "") == 0) 4772 return -EINVAL; 4773 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name, 4774 buffer, size); 4775 } 4776 4777 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name, 4778 const void *value, size_t size, int flags) 4779 { 4780 if (strcmp(name, "") == 0) 4781 return -EINVAL; 4782 4783 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value, 4784 size, flags); 4785 } 4786 4787 struct xattr_handler ocfs2_xattr_trusted_handler = { 4788 .prefix = XATTR_TRUSTED_PREFIX, 4789 .list = ocfs2_xattr_trusted_list, 4790 .get = ocfs2_xattr_trusted_get, 4791 .set = ocfs2_xattr_trusted_set, 4792 }; 4793 4794 4795 /* 4796 * 'user' attributes support 4797 */ 4798 4799 #define XATTR_USER_PREFIX "user." 4800 4801 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list, 4802 size_t list_size, const char *name, 4803 size_t name_len) 4804 { 4805 const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1; 4806 const size_t total_len = prefix_len + name_len + 1; 4807 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4808 4809 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR) 4810 return 0; 4811 4812 if (list && total_len <= list_size) { 4813 memcpy(list, XATTR_USER_PREFIX, prefix_len); 4814 memcpy(list + prefix_len, name, name_len); 4815 list[prefix_len + name_len] = '\0'; 4816 } 4817 return total_len; 4818 } 4819 4820 static int ocfs2_xattr_user_get(struct inode *inode, const char *name, 4821 void *buffer, size_t size) 4822 { 4823 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4824 4825 if (strcmp(name, "") == 0) 4826 return -EINVAL; 4827 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR) 4828 return -EOPNOTSUPP; 4829 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name, 4830 buffer, size); 4831 } 4832 4833 static int ocfs2_xattr_user_set(struct inode *inode, const char *name, 4834 const void *value, size_t size, int flags) 4835 { 4836 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4837 4838 if (strcmp(name, "") == 0) 4839 return -EINVAL; 4840 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR) 4841 return -EOPNOTSUPP; 4842 4843 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value, 4844 size, flags); 4845 } 4846 4847 struct xattr_handler ocfs2_xattr_user_handler = { 4848 .prefix = XATTR_USER_PREFIX, 4849 .list = ocfs2_xattr_user_list, 4850 .get = ocfs2_xattr_user_get, 4851 .set = ocfs2_xattr_user_set, 4852 }; 4853