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