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_get_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 ocfs2_put_extent_tree(&et); 311 return status; 312 } 313 314 static int __ocfs2_remove_xattr_range(struct inode *inode, 315 struct buffer_head *root_bh, 316 struct ocfs2_xattr_value_root *xv, 317 u32 cpos, u32 phys_cpos, u32 len, 318 struct ocfs2_cached_dealloc_ctxt *dealloc) 319 { 320 int ret; 321 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); 322 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 323 struct inode *tl_inode = osb->osb_tl_inode; 324 handle_t *handle; 325 struct ocfs2_alloc_context *meta_ac = NULL; 326 struct ocfs2_extent_tree et; 327 328 ocfs2_get_xattr_value_extent_tree(&et, inode, root_bh, xv); 329 330 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac); 331 if (ret) { 332 ocfs2_put_extent_tree(&et); 333 mlog_errno(ret); 334 return ret; 335 } 336 337 mutex_lock(&tl_inode->i_mutex); 338 339 if (ocfs2_truncate_log_needs_flush(osb)) { 340 ret = __ocfs2_flush_truncate_log(osb); 341 if (ret < 0) { 342 mlog_errno(ret); 343 goto out; 344 } 345 } 346 347 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 348 if (IS_ERR(handle)) { 349 ret = PTR_ERR(handle); 350 mlog_errno(ret); 351 goto out; 352 } 353 354 ret = ocfs2_journal_access(handle, inode, root_bh, 355 OCFS2_JOURNAL_ACCESS_WRITE); 356 if (ret) { 357 mlog_errno(ret); 358 goto out_commit; 359 } 360 361 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac, 362 dealloc); 363 if (ret) { 364 mlog_errno(ret); 365 goto out_commit; 366 } 367 368 le32_add_cpu(&xv->xr_clusters, -len); 369 370 ret = ocfs2_journal_dirty(handle, root_bh); 371 if (ret) { 372 mlog_errno(ret); 373 goto out_commit; 374 } 375 376 ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len); 377 if (ret) 378 mlog_errno(ret); 379 380 out_commit: 381 ocfs2_commit_trans(osb, handle); 382 out: 383 mutex_unlock(&tl_inode->i_mutex); 384 385 if (meta_ac) 386 ocfs2_free_alloc_context(meta_ac); 387 388 ocfs2_put_extent_tree(&et); 389 return ret; 390 } 391 392 static int ocfs2_xattr_shrink_size(struct inode *inode, 393 u32 old_clusters, 394 u32 new_clusters, 395 struct buffer_head *root_bh, 396 struct ocfs2_xattr_value_root *xv) 397 { 398 int ret = 0; 399 u32 trunc_len, cpos, phys_cpos, alloc_size; 400 u64 block; 401 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 402 struct ocfs2_cached_dealloc_ctxt dealloc; 403 404 ocfs2_init_dealloc_ctxt(&dealloc); 405 406 if (old_clusters <= new_clusters) 407 return 0; 408 409 cpos = new_clusters; 410 trunc_len = old_clusters - new_clusters; 411 while (trunc_len) { 412 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos, 413 &alloc_size, &xv->xr_list); 414 if (ret) { 415 mlog_errno(ret); 416 goto out; 417 } 418 419 if (alloc_size > trunc_len) 420 alloc_size = trunc_len; 421 422 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos, 423 phys_cpos, alloc_size, 424 &dealloc); 425 if (ret) { 426 mlog_errno(ret); 427 goto out; 428 } 429 430 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); 431 ocfs2_remove_xattr_clusters_from_cache(inode, block, 432 alloc_size); 433 cpos += alloc_size; 434 trunc_len -= alloc_size; 435 } 436 437 out: 438 ocfs2_schedule_truncate_log_flush(osb, 1); 439 ocfs2_run_deallocs(osb, &dealloc); 440 441 return ret; 442 } 443 444 static int ocfs2_xattr_value_truncate(struct inode *inode, 445 struct buffer_head *root_bh, 446 struct ocfs2_xattr_value_root *xv, 447 int len) 448 { 449 int ret; 450 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len); 451 u32 old_clusters = le32_to_cpu(xv->xr_clusters); 452 453 if (new_clusters == old_clusters) 454 return 0; 455 456 if (new_clusters > old_clusters) 457 ret = ocfs2_xattr_extend_allocation(inode, 458 new_clusters - old_clusters, 459 root_bh, xv); 460 else 461 ret = ocfs2_xattr_shrink_size(inode, 462 old_clusters, new_clusters, 463 root_bh, xv); 464 465 return ret; 466 } 467 468 static int ocfs2_xattr_list_entries(struct inode *inode, 469 struct ocfs2_xattr_header *header, 470 char *buffer, size_t buffer_size) 471 { 472 size_t rest = buffer_size; 473 int i; 474 475 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) { 476 struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; 477 struct xattr_handler *handler = 478 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); 479 480 if (handler) { 481 size_t size = handler->list(inode, buffer, rest, 482 ((char *)header + 483 le16_to_cpu(entry->xe_name_offset)), 484 entry->xe_name_len); 485 if (buffer) { 486 if (size > rest) 487 return -ERANGE; 488 buffer += size; 489 } 490 rest -= size; 491 } 492 } 493 494 return buffer_size - rest; 495 } 496 497 static int ocfs2_xattr_ibody_list(struct inode *inode, 498 struct ocfs2_dinode *di, 499 char *buffer, 500 size_t buffer_size) 501 { 502 struct ocfs2_xattr_header *header = NULL; 503 struct ocfs2_inode_info *oi = OCFS2_I(inode); 504 int ret = 0; 505 506 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) 507 return ret; 508 509 header = (struct ocfs2_xattr_header *) 510 ((void *)di + inode->i_sb->s_blocksize - 511 le16_to_cpu(di->i_xattr_inline_size)); 512 513 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size); 514 515 return ret; 516 } 517 518 static int ocfs2_xattr_block_list(struct inode *inode, 519 struct ocfs2_dinode *di, 520 char *buffer, 521 size_t buffer_size) 522 { 523 struct buffer_head *blk_bh = NULL; 524 struct ocfs2_xattr_block *xb; 525 int ret = 0; 526 527 if (!di->i_xattr_loc) 528 return ret; 529 530 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 531 le64_to_cpu(di->i_xattr_loc), 532 &blk_bh, OCFS2_BH_CACHED, inode); 533 if (ret < 0) { 534 mlog_errno(ret); 535 return ret; 536 } 537 /*Verify the signature of xattr block*/ 538 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 539 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 540 ret = -EFAULT; 541 goto cleanup; 542 } 543 544 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 545 546 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 547 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header; 548 ret = ocfs2_xattr_list_entries(inode, header, 549 buffer, buffer_size); 550 } else { 551 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root; 552 ret = ocfs2_xattr_tree_list_index_block(inode, xt, 553 buffer, buffer_size); 554 } 555 cleanup: 556 brelse(blk_bh); 557 558 return ret; 559 } 560 561 ssize_t ocfs2_listxattr(struct dentry *dentry, 562 char *buffer, 563 size_t size) 564 { 565 int ret = 0, i_ret = 0, b_ret = 0; 566 struct buffer_head *di_bh = NULL; 567 struct ocfs2_dinode *di = NULL; 568 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode); 569 570 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb))) 571 return -EOPNOTSUPP; 572 573 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 574 return ret; 575 576 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0); 577 if (ret < 0) { 578 mlog_errno(ret); 579 return ret; 580 } 581 582 di = (struct ocfs2_dinode *)di_bh->b_data; 583 584 down_read(&oi->ip_xattr_sem); 585 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size); 586 if (i_ret < 0) 587 b_ret = 0; 588 else { 589 if (buffer) { 590 buffer += i_ret; 591 size -= i_ret; 592 } 593 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di, 594 buffer, size); 595 if (b_ret < 0) 596 i_ret = 0; 597 } 598 up_read(&oi->ip_xattr_sem); 599 ocfs2_inode_unlock(dentry->d_inode, 0); 600 601 brelse(di_bh); 602 603 return i_ret + b_ret; 604 } 605 606 static int ocfs2_xattr_find_entry(int name_index, 607 const char *name, 608 struct ocfs2_xattr_search *xs) 609 { 610 struct ocfs2_xattr_entry *entry; 611 size_t name_len; 612 int i, cmp = 1; 613 614 if (name == NULL) 615 return -EINVAL; 616 617 name_len = strlen(name); 618 entry = xs->here; 619 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) { 620 cmp = name_index - ocfs2_xattr_get_type(entry); 621 if (!cmp) 622 cmp = name_len - entry->xe_name_len; 623 if (!cmp) 624 cmp = memcmp(name, (xs->base + 625 le16_to_cpu(entry->xe_name_offset)), 626 name_len); 627 if (cmp == 0) 628 break; 629 entry += 1; 630 } 631 xs->here = entry; 632 633 return cmp ? -ENODATA : 0; 634 } 635 636 static int ocfs2_xattr_get_value_outside(struct inode *inode, 637 struct ocfs2_xattr_value_root *xv, 638 void *buffer, 639 size_t len) 640 { 641 u32 cpos, p_cluster, num_clusters, bpc, clusters; 642 u64 blkno; 643 int i, ret = 0; 644 size_t cplen, blocksize; 645 struct buffer_head *bh = NULL; 646 struct ocfs2_extent_list *el; 647 648 el = &xv->xr_list; 649 clusters = le32_to_cpu(xv->xr_clusters); 650 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 651 blocksize = inode->i_sb->s_blocksize; 652 653 cpos = 0; 654 while (cpos < clusters) { 655 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, 656 &num_clusters, el); 657 if (ret) { 658 mlog_errno(ret); 659 goto out; 660 } 661 662 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); 663 /* Copy ocfs2_xattr_value */ 664 for (i = 0; i < num_clusters * bpc; i++, blkno++) { 665 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 666 &bh, OCFS2_BH_CACHED, inode); 667 if (ret) { 668 mlog_errno(ret); 669 goto out; 670 } 671 672 cplen = len >= blocksize ? blocksize : len; 673 memcpy(buffer, bh->b_data, cplen); 674 len -= cplen; 675 buffer += cplen; 676 677 brelse(bh); 678 bh = NULL; 679 if (len == 0) 680 break; 681 } 682 cpos += num_clusters; 683 } 684 out: 685 return ret; 686 } 687 688 static int ocfs2_xattr_ibody_get(struct inode *inode, 689 int name_index, 690 const char *name, 691 void *buffer, 692 size_t buffer_size, 693 struct ocfs2_xattr_search *xs) 694 { 695 struct ocfs2_inode_info *oi = OCFS2_I(inode); 696 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 697 struct ocfs2_xattr_value_root *xv; 698 size_t size; 699 int ret = 0; 700 701 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) 702 return -ENODATA; 703 704 xs->end = (void *)di + inode->i_sb->s_blocksize; 705 xs->header = (struct ocfs2_xattr_header *) 706 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 707 xs->base = (void *)xs->header; 708 xs->here = xs->header->xh_entries; 709 710 ret = ocfs2_xattr_find_entry(name_index, name, xs); 711 if (ret) 712 return ret; 713 size = le64_to_cpu(xs->here->xe_value_size); 714 if (buffer) { 715 if (size > buffer_size) 716 return -ERANGE; 717 if (ocfs2_xattr_is_local(xs->here)) { 718 memcpy(buffer, (void *)xs->base + 719 le16_to_cpu(xs->here->xe_name_offset) + 720 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size); 721 } else { 722 xv = (struct ocfs2_xattr_value_root *) 723 (xs->base + le16_to_cpu( 724 xs->here->xe_name_offset) + 725 OCFS2_XATTR_SIZE(xs->here->xe_name_len)); 726 ret = ocfs2_xattr_get_value_outside(inode, xv, 727 buffer, size); 728 if (ret < 0) { 729 mlog_errno(ret); 730 return ret; 731 } 732 } 733 } 734 735 return size; 736 } 737 738 static int ocfs2_xattr_block_get(struct inode *inode, 739 int name_index, 740 const char *name, 741 void *buffer, 742 size_t buffer_size, 743 struct ocfs2_xattr_search *xs) 744 { 745 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 746 struct buffer_head *blk_bh = NULL; 747 struct ocfs2_xattr_block *xb; 748 struct ocfs2_xattr_value_root *xv; 749 size_t size; 750 int ret = -ENODATA, name_offset, name_len, block_off, i; 751 752 if (!di->i_xattr_loc) 753 return ret; 754 755 memset(&xs->bucket, 0, sizeof(xs->bucket)); 756 757 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 758 le64_to_cpu(di->i_xattr_loc), 759 &blk_bh, OCFS2_BH_CACHED, inode); 760 if (ret < 0) { 761 mlog_errno(ret); 762 return ret; 763 } 764 /*Verify the signature of xattr block*/ 765 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 766 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 767 ret = -EFAULT; 768 goto cleanup; 769 } 770 771 xs->xattr_bh = blk_bh; 772 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 773 774 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 775 xs->header = &xb->xb_attrs.xb_header; 776 xs->base = (void *)xs->header; 777 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 778 xs->here = xs->header->xh_entries; 779 780 ret = ocfs2_xattr_find_entry(name_index, name, xs); 781 } else 782 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 783 name_index, 784 name, xs); 785 786 if (ret) 787 goto cleanup; 788 size = le64_to_cpu(xs->here->xe_value_size); 789 if (buffer) { 790 ret = -ERANGE; 791 if (size > buffer_size) 792 goto cleanup; 793 794 name_offset = le16_to_cpu(xs->here->xe_name_offset); 795 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len); 796 i = xs->here - xs->header->xh_entries; 797 798 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) { 799 ret = ocfs2_xattr_bucket_get_name_value(inode, 800 xs->bucket.xh, 801 i, 802 &block_off, 803 &name_offset); 804 xs->base = xs->bucket.bhs[block_off]->b_data; 805 } 806 if (ocfs2_xattr_is_local(xs->here)) { 807 memcpy(buffer, (void *)xs->base + 808 name_offset + name_len, size); 809 } else { 810 xv = (struct ocfs2_xattr_value_root *) 811 (xs->base + name_offset + name_len); 812 ret = ocfs2_xattr_get_value_outside(inode, xv, 813 buffer, size); 814 if (ret < 0) { 815 mlog_errno(ret); 816 goto cleanup; 817 } 818 } 819 } 820 ret = size; 821 cleanup: 822 for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++) 823 brelse(xs->bucket.bhs[i]); 824 memset(&xs->bucket, 0, sizeof(xs->bucket)); 825 826 brelse(blk_bh); 827 return ret; 828 } 829 830 /* ocfs2_xattr_get() 831 * 832 * Copy an extended attribute into the buffer provided. 833 * Buffer is NULL to compute the size of buffer required. 834 */ 835 int ocfs2_xattr_get(struct inode *inode, 836 int name_index, 837 const char *name, 838 void *buffer, 839 size_t buffer_size) 840 { 841 int ret; 842 struct ocfs2_dinode *di = NULL; 843 struct buffer_head *di_bh = NULL; 844 struct ocfs2_inode_info *oi = OCFS2_I(inode); 845 struct ocfs2_xattr_search xis = { 846 .not_found = -ENODATA, 847 }; 848 struct ocfs2_xattr_search xbs = { 849 .not_found = -ENODATA, 850 }; 851 852 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 853 return -EOPNOTSUPP; 854 855 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 856 ret = -ENODATA; 857 858 ret = ocfs2_inode_lock(inode, &di_bh, 0); 859 if (ret < 0) { 860 mlog_errno(ret); 861 return ret; 862 } 863 xis.inode_bh = xbs.inode_bh = di_bh; 864 di = (struct ocfs2_dinode *)di_bh->b_data; 865 866 down_read(&oi->ip_xattr_sem); 867 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer, 868 buffer_size, &xis); 869 if (ret == -ENODATA) 870 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer, 871 buffer_size, &xbs); 872 up_read(&oi->ip_xattr_sem); 873 ocfs2_inode_unlock(inode, 0); 874 875 brelse(di_bh); 876 877 return ret; 878 } 879 880 static int __ocfs2_xattr_set_value_outside(struct inode *inode, 881 struct ocfs2_xattr_value_root *xv, 882 const void *value, 883 int value_len) 884 { 885 int ret = 0, i, cp_len, credits; 886 u16 blocksize = inode->i_sb->s_blocksize; 887 u32 p_cluster, num_clusters; 888 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 889 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len); 890 u64 blkno; 891 struct buffer_head *bh = NULL; 892 handle_t *handle; 893 894 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters)); 895 896 credits = clusters * bpc; 897 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits); 898 if (IS_ERR(handle)) { 899 ret = PTR_ERR(handle); 900 mlog_errno(ret); 901 goto out; 902 } 903 904 while (cpos < clusters) { 905 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, 906 &num_clusters, &xv->xr_list); 907 if (ret) { 908 mlog_errno(ret); 909 goto out_commit; 910 } 911 912 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); 913 914 for (i = 0; i < num_clusters * bpc; i++, blkno++) { 915 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 916 &bh, OCFS2_BH_CACHED, inode); 917 if (ret) { 918 mlog_errno(ret); 919 goto out_commit; 920 } 921 922 ret = ocfs2_journal_access(handle, 923 inode, 924 bh, 925 OCFS2_JOURNAL_ACCESS_WRITE); 926 if (ret < 0) { 927 mlog_errno(ret); 928 goto out_commit; 929 } 930 931 cp_len = value_len > blocksize ? blocksize : value_len; 932 memcpy(bh->b_data, value, cp_len); 933 value_len -= cp_len; 934 value += cp_len; 935 if (cp_len < blocksize) 936 memset(bh->b_data + cp_len, 0, 937 blocksize - cp_len); 938 939 ret = ocfs2_journal_dirty(handle, bh); 940 if (ret < 0) { 941 mlog_errno(ret); 942 goto out_commit; 943 } 944 brelse(bh); 945 bh = NULL; 946 947 /* 948 * XXX: do we need to empty all the following 949 * blocks in this cluster? 950 */ 951 if (!value_len) 952 break; 953 } 954 cpos += num_clusters; 955 } 956 out_commit: 957 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 958 out: 959 brelse(bh); 960 961 return ret; 962 } 963 964 static int ocfs2_xattr_cleanup(struct inode *inode, 965 struct ocfs2_xattr_info *xi, 966 struct ocfs2_xattr_search *xs, 967 size_t offs) 968 { 969 handle_t *handle = NULL; 970 int ret = 0; 971 size_t name_len = strlen(xi->name); 972 void *val = xs->base + offs; 973 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 974 975 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 976 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 977 if (IS_ERR(handle)) { 978 ret = PTR_ERR(handle); 979 mlog_errno(ret); 980 goto out; 981 } 982 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 983 OCFS2_JOURNAL_ACCESS_WRITE); 984 if (ret) { 985 mlog_errno(ret); 986 goto out_commit; 987 } 988 /* Decrease xattr count */ 989 le16_add_cpu(&xs->header->xh_count, -1); 990 /* Remove the xattr entry and tree root which has already be set*/ 991 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry)); 992 memset(val, 0, size); 993 994 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 995 if (ret < 0) 996 mlog_errno(ret); 997 out_commit: 998 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 999 out: 1000 return ret; 1001 } 1002 1003 static int ocfs2_xattr_update_entry(struct inode *inode, 1004 struct ocfs2_xattr_info *xi, 1005 struct ocfs2_xattr_search *xs, 1006 size_t offs) 1007 { 1008 handle_t *handle = NULL; 1009 int ret = 0; 1010 1011 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1012 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1013 if (IS_ERR(handle)) { 1014 ret = PTR_ERR(handle); 1015 mlog_errno(ret); 1016 goto out; 1017 } 1018 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1019 OCFS2_JOURNAL_ACCESS_WRITE); 1020 if (ret) { 1021 mlog_errno(ret); 1022 goto out_commit; 1023 } 1024 1025 xs->here->xe_name_offset = cpu_to_le16(offs); 1026 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1027 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE) 1028 ocfs2_xattr_set_local(xs->here, 1); 1029 else 1030 ocfs2_xattr_set_local(xs->here, 0); 1031 ocfs2_xattr_hash_entry(inode, xs->header, xs->here); 1032 1033 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1034 if (ret < 0) 1035 mlog_errno(ret); 1036 out_commit: 1037 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1038 out: 1039 return ret; 1040 } 1041 1042 /* 1043 * ocfs2_xattr_set_value_outside() 1044 * 1045 * Set large size value in B tree. 1046 */ 1047 static int ocfs2_xattr_set_value_outside(struct inode *inode, 1048 struct ocfs2_xattr_info *xi, 1049 struct ocfs2_xattr_search *xs, 1050 size_t offs) 1051 { 1052 size_t name_len = strlen(xi->name); 1053 void *val = xs->base + offs; 1054 struct ocfs2_xattr_value_root *xv = NULL; 1055 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 1056 int ret = 0; 1057 1058 memset(val, 0, size); 1059 memcpy(val, xi->name, name_len); 1060 xv = (struct ocfs2_xattr_value_root *) 1061 (val + OCFS2_XATTR_SIZE(name_len)); 1062 xv->xr_clusters = 0; 1063 xv->xr_last_eb_blk = 0; 1064 xv->xr_list.l_tree_depth = 0; 1065 xv->xr_list.l_count = cpu_to_le16(1); 1066 xv->xr_list.l_next_free_rec = 0; 1067 1068 ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv, 1069 xi->value_len); 1070 if (ret < 0) { 1071 mlog_errno(ret); 1072 return ret; 1073 } 1074 ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value, 1075 xi->value_len); 1076 if (ret < 0) { 1077 mlog_errno(ret); 1078 return ret; 1079 } 1080 ret = ocfs2_xattr_update_entry(inode, xi, xs, offs); 1081 if (ret < 0) 1082 mlog_errno(ret); 1083 1084 return ret; 1085 } 1086 1087 /* 1088 * ocfs2_xattr_set_entry_local() 1089 * 1090 * Set, replace or remove extended attribute in local. 1091 */ 1092 static void ocfs2_xattr_set_entry_local(struct inode *inode, 1093 struct ocfs2_xattr_info *xi, 1094 struct ocfs2_xattr_search *xs, 1095 struct ocfs2_xattr_entry *last, 1096 size_t min_offs) 1097 { 1098 size_t name_len = strlen(xi->name); 1099 int i; 1100 1101 if (xi->value && xs->not_found) { 1102 /* Insert the new xattr entry. */ 1103 le16_add_cpu(&xs->header->xh_count, 1); 1104 ocfs2_xattr_set_type(last, xi->name_index); 1105 ocfs2_xattr_set_local(last, 1); 1106 last->xe_name_len = name_len; 1107 } else { 1108 void *first_val; 1109 void *val; 1110 size_t offs, size; 1111 1112 first_val = xs->base + min_offs; 1113 offs = le16_to_cpu(xs->here->xe_name_offset); 1114 val = xs->base + offs; 1115 1116 if (le64_to_cpu(xs->here->xe_value_size) > 1117 OCFS2_XATTR_INLINE_SIZE) 1118 size = OCFS2_XATTR_SIZE(name_len) + 1119 OCFS2_XATTR_ROOT_SIZE; 1120 else 1121 size = OCFS2_XATTR_SIZE(name_len) + 1122 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1123 1124 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) + 1125 OCFS2_XATTR_SIZE(xi->value_len)) { 1126 /* The old and the new value have the 1127 same size. Just replace the value. */ 1128 ocfs2_xattr_set_local(xs->here, 1); 1129 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1130 /* Clear value bytes. */ 1131 memset(val + OCFS2_XATTR_SIZE(name_len), 1132 0, 1133 OCFS2_XATTR_SIZE(xi->value_len)); 1134 memcpy(val + OCFS2_XATTR_SIZE(name_len), 1135 xi->value, 1136 xi->value_len); 1137 return; 1138 } 1139 /* Remove the old name+value. */ 1140 memmove(first_val + size, first_val, val - first_val); 1141 memset(first_val, 0, size); 1142 xs->here->xe_name_hash = 0; 1143 xs->here->xe_name_offset = 0; 1144 ocfs2_xattr_set_local(xs->here, 1); 1145 xs->here->xe_value_size = 0; 1146 1147 min_offs += size; 1148 1149 /* Adjust all value offsets. */ 1150 last = xs->header->xh_entries; 1151 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { 1152 size_t o = le16_to_cpu(last->xe_name_offset); 1153 1154 if (o < offs) 1155 last->xe_name_offset = cpu_to_le16(o + size); 1156 last += 1; 1157 } 1158 1159 if (!xi->value) { 1160 /* Remove the old entry. */ 1161 last -= 1; 1162 memmove(xs->here, xs->here + 1, 1163 (void *)last - (void *)xs->here); 1164 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 1165 le16_add_cpu(&xs->header->xh_count, -1); 1166 } 1167 } 1168 if (xi->value) { 1169 /* Insert the new name+value. */ 1170 size_t size = OCFS2_XATTR_SIZE(name_len) + 1171 OCFS2_XATTR_SIZE(xi->value_len); 1172 void *val = xs->base + min_offs - size; 1173 1174 xs->here->xe_name_offset = cpu_to_le16(min_offs - size); 1175 memset(val, 0, size); 1176 memcpy(val, xi->name, name_len); 1177 memcpy(val + OCFS2_XATTR_SIZE(name_len), 1178 xi->value, 1179 xi->value_len); 1180 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1181 ocfs2_xattr_set_local(xs->here, 1); 1182 ocfs2_xattr_hash_entry(inode, xs->header, xs->here); 1183 } 1184 1185 return; 1186 } 1187 1188 /* 1189 * ocfs2_xattr_set_entry() 1190 * 1191 * Set extended attribute entry into inode or block. 1192 * 1193 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE, 1194 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(), 1195 * then set value in B tree with set_value_outside(). 1196 */ 1197 static int ocfs2_xattr_set_entry(struct inode *inode, 1198 struct ocfs2_xattr_info *xi, 1199 struct ocfs2_xattr_search *xs, 1200 int flag) 1201 { 1202 struct ocfs2_xattr_entry *last; 1203 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1204 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1205 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name); 1206 size_t size_l = 0; 1207 handle_t *handle = NULL; 1208 int free, i, ret; 1209 struct ocfs2_xattr_info xi_l = { 1210 .name_index = xi->name_index, 1211 .name = xi->name, 1212 .value = xi->value, 1213 .value_len = xi->value_len, 1214 }; 1215 1216 /* Compute min_offs, last and free space. */ 1217 last = xs->header->xh_entries; 1218 1219 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { 1220 size_t offs = le16_to_cpu(last->xe_name_offset); 1221 if (offs < min_offs) 1222 min_offs = offs; 1223 last += 1; 1224 } 1225 1226 free = min_offs - ((void *)last - xs->base) - sizeof(__u32); 1227 if (free < 0) 1228 return -EFAULT; 1229 1230 if (!xs->not_found) { 1231 size_t size = 0; 1232 if (ocfs2_xattr_is_local(xs->here)) 1233 size = OCFS2_XATTR_SIZE(name_len) + 1234 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1235 else 1236 size = OCFS2_XATTR_SIZE(name_len) + 1237 OCFS2_XATTR_ROOT_SIZE; 1238 free += (size + sizeof(struct ocfs2_xattr_entry)); 1239 } 1240 /* Check free space in inode or block */ 1241 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1242 if (free < sizeof(struct ocfs2_xattr_entry) + 1243 OCFS2_XATTR_SIZE(name_len) + 1244 OCFS2_XATTR_ROOT_SIZE) { 1245 ret = -ENOSPC; 1246 goto out; 1247 } 1248 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 1249 xi_l.value = (void *)&def_xv; 1250 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE; 1251 } else if (xi->value) { 1252 if (free < sizeof(struct ocfs2_xattr_entry) + 1253 OCFS2_XATTR_SIZE(name_len) + 1254 OCFS2_XATTR_SIZE(xi->value_len)) { 1255 ret = -ENOSPC; 1256 goto out; 1257 } 1258 } 1259 1260 if (!xs->not_found) { 1261 /* For existing extended attribute */ 1262 size_t size = OCFS2_XATTR_SIZE(name_len) + 1263 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1264 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1265 void *val = xs->base + offs; 1266 1267 if (ocfs2_xattr_is_local(xs->here) && size == size_l) { 1268 /* Replace existing local xattr with tree root */ 1269 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, 1270 offs); 1271 if (ret < 0) 1272 mlog_errno(ret); 1273 goto out; 1274 } else if (!ocfs2_xattr_is_local(xs->here)) { 1275 /* For existing xattr which has value outside */ 1276 struct ocfs2_xattr_value_root *xv = NULL; 1277 xv = (struct ocfs2_xattr_value_root *)(val + 1278 OCFS2_XATTR_SIZE(name_len)); 1279 1280 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1281 /* 1282 * If new value need set outside also, 1283 * first truncate old value to new value, 1284 * then set new value with set_value_outside(). 1285 */ 1286 ret = ocfs2_xattr_value_truncate(inode, 1287 xs->xattr_bh, 1288 xv, 1289 xi->value_len); 1290 if (ret < 0) { 1291 mlog_errno(ret); 1292 goto out; 1293 } 1294 1295 ret = __ocfs2_xattr_set_value_outside(inode, 1296 xv, 1297 xi->value, 1298 xi->value_len); 1299 if (ret < 0) { 1300 mlog_errno(ret); 1301 goto out; 1302 } 1303 1304 ret = ocfs2_xattr_update_entry(inode, 1305 xi, 1306 xs, 1307 offs); 1308 if (ret < 0) 1309 mlog_errno(ret); 1310 goto out; 1311 } else { 1312 /* 1313 * If new value need set in local, 1314 * just trucate old value to zero. 1315 */ 1316 ret = ocfs2_xattr_value_truncate(inode, 1317 xs->xattr_bh, 1318 xv, 1319 0); 1320 if (ret < 0) 1321 mlog_errno(ret); 1322 } 1323 } 1324 } 1325 1326 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1327 OCFS2_INODE_UPDATE_CREDITS); 1328 if (IS_ERR(handle)) { 1329 ret = PTR_ERR(handle); 1330 mlog_errno(ret); 1331 goto out; 1332 } 1333 1334 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1335 OCFS2_JOURNAL_ACCESS_WRITE); 1336 if (ret) { 1337 mlog_errno(ret); 1338 goto out_commit; 1339 } 1340 1341 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1342 /*set extended attribue in external blcok*/ 1343 ret = ocfs2_extend_trans(handle, 1344 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1345 if (ret) { 1346 mlog_errno(ret); 1347 goto out_commit; 1348 } 1349 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1350 OCFS2_JOURNAL_ACCESS_WRITE); 1351 if (ret) { 1352 mlog_errno(ret); 1353 goto out_commit; 1354 } 1355 } 1356 1357 /* 1358 * Set value in local, include set tree root in local. 1359 * This is the first step for value size >INLINE_SIZE. 1360 */ 1361 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs); 1362 1363 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1364 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1365 if (ret < 0) { 1366 mlog_errno(ret); 1367 goto out_commit; 1368 } 1369 } 1370 1371 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) && 1372 (flag & OCFS2_INLINE_XATTR_FL)) { 1373 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1374 unsigned int xattrsize = osb->s_xattr_inline_size; 1375 1376 /* 1377 * Adjust extent record count or inline data size 1378 * to reserve space for extended attribute. 1379 */ 1380 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1381 struct ocfs2_inline_data *idata = &di->id2.i_data; 1382 le16_add_cpu(&idata->id_count, -xattrsize); 1383 } else if (!(ocfs2_inode_is_fast_symlink(inode))) { 1384 struct ocfs2_extent_list *el = &di->id2.i_list; 1385 le16_add_cpu(&el->l_count, -(xattrsize / 1386 sizeof(struct ocfs2_extent_rec))); 1387 } 1388 di->i_xattr_inline_size = cpu_to_le16(xattrsize); 1389 } 1390 /* Update xattr flag */ 1391 spin_lock(&oi->ip_lock); 1392 oi->ip_dyn_features |= flag; 1393 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1394 spin_unlock(&oi->ip_lock); 1395 /* Update inode ctime */ 1396 inode->i_ctime = CURRENT_TIME; 1397 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); 1398 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 1399 1400 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1401 if (ret < 0) 1402 mlog_errno(ret); 1403 1404 out_commit: 1405 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1406 1407 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1408 /* 1409 * Set value outside in B tree. 1410 * This is the second step for value size > INLINE_SIZE. 1411 */ 1412 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1413 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs); 1414 if (ret < 0) { 1415 int ret2; 1416 1417 mlog_errno(ret); 1418 /* 1419 * If set value outside failed, we have to clean 1420 * the junk tree root we have already set in local. 1421 */ 1422 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs); 1423 if (ret2 < 0) 1424 mlog_errno(ret2); 1425 } 1426 } 1427 out: 1428 return ret; 1429 1430 } 1431 1432 static int ocfs2_xattr_free_block(handle_t *handle, 1433 struct ocfs2_super *osb, 1434 struct ocfs2_xattr_block *xb) 1435 { 1436 struct inode *xb_alloc_inode; 1437 struct buffer_head *xb_alloc_bh = NULL; 1438 u64 blk = le64_to_cpu(xb->xb_blkno); 1439 u16 bit = le16_to_cpu(xb->xb_suballoc_bit); 1440 u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit); 1441 int ret = 0; 1442 1443 xb_alloc_inode = ocfs2_get_system_file_inode(osb, 1444 EXTENT_ALLOC_SYSTEM_INODE, 1445 le16_to_cpu(xb->xb_suballoc_slot)); 1446 if (!xb_alloc_inode) { 1447 ret = -ENOMEM; 1448 mlog_errno(ret); 1449 goto out; 1450 } 1451 mutex_lock(&xb_alloc_inode->i_mutex); 1452 1453 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1); 1454 if (ret < 0) { 1455 mlog_errno(ret); 1456 goto out_mutex; 1457 } 1458 ret = ocfs2_extend_trans(handle, OCFS2_SUBALLOC_FREE); 1459 if (ret < 0) { 1460 mlog_errno(ret); 1461 goto out_unlock; 1462 } 1463 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh, 1464 bit, bg_blkno, 1); 1465 if (ret < 0) 1466 mlog_errno(ret); 1467 out_unlock: 1468 ocfs2_inode_unlock(xb_alloc_inode, 1); 1469 brelse(xb_alloc_bh); 1470 out_mutex: 1471 mutex_unlock(&xb_alloc_inode->i_mutex); 1472 iput(xb_alloc_inode); 1473 out: 1474 return ret; 1475 } 1476 1477 static int ocfs2_remove_value_outside(struct inode*inode, 1478 struct buffer_head *bh, 1479 struct ocfs2_xattr_header *header) 1480 { 1481 int ret = 0, i; 1482 1483 for (i = 0; i < le16_to_cpu(header->xh_count); i++) { 1484 struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; 1485 1486 if (!ocfs2_xattr_is_local(entry)) { 1487 struct ocfs2_xattr_value_root *xv; 1488 void *val; 1489 1490 val = (void *)header + 1491 le16_to_cpu(entry->xe_name_offset); 1492 xv = (struct ocfs2_xattr_value_root *) 1493 (val + OCFS2_XATTR_SIZE(entry->xe_name_len)); 1494 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0); 1495 if (ret < 0) { 1496 mlog_errno(ret); 1497 return ret; 1498 } 1499 } 1500 } 1501 1502 return ret; 1503 } 1504 1505 static int ocfs2_xattr_ibody_remove(struct inode *inode, 1506 struct buffer_head *di_bh) 1507 { 1508 1509 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1510 struct ocfs2_xattr_header *header; 1511 int ret; 1512 1513 header = (struct ocfs2_xattr_header *) 1514 ((void *)di + inode->i_sb->s_blocksize - 1515 le16_to_cpu(di->i_xattr_inline_size)); 1516 1517 ret = ocfs2_remove_value_outside(inode, di_bh, header); 1518 1519 return ret; 1520 } 1521 1522 static int ocfs2_xattr_block_remove(struct inode *inode, 1523 struct buffer_head *blk_bh) 1524 { 1525 struct ocfs2_xattr_block *xb; 1526 int ret = 0; 1527 1528 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1529 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1530 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header); 1531 ret = ocfs2_remove_value_outside(inode, blk_bh, header); 1532 } else 1533 ret = ocfs2_delete_xattr_index_block(inode, blk_bh); 1534 1535 return ret; 1536 } 1537 1538 /* 1539 * ocfs2_xattr_remove() 1540 * 1541 * Free extended attribute resources associated with this inode. 1542 */ 1543 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh) 1544 { 1545 struct ocfs2_xattr_block *xb; 1546 struct buffer_head *blk_bh = NULL; 1547 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1548 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1549 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1550 handle_t *handle; 1551 int ret; 1552 1553 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 1554 return 0; 1555 1556 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 1557 return 0; 1558 1559 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1560 ret = ocfs2_xattr_ibody_remove(inode, di_bh); 1561 if (ret < 0) { 1562 mlog_errno(ret); 1563 goto out; 1564 } 1565 } 1566 if (di->i_xattr_loc) { 1567 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1568 le64_to_cpu(di->i_xattr_loc), 1569 &blk_bh, OCFS2_BH_CACHED, inode); 1570 if (ret < 0) { 1571 mlog_errno(ret); 1572 return ret; 1573 } 1574 /*Verify the signature of xattr block*/ 1575 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 1576 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 1577 ret = -EFAULT; 1578 goto out; 1579 } 1580 1581 ret = ocfs2_xattr_block_remove(inode, blk_bh); 1582 if (ret < 0) { 1583 mlog_errno(ret); 1584 goto out; 1585 } 1586 } 1587 1588 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1589 OCFS2_INODE_UPDATE_CREDITS); 1590 if (IS_ERR(handle)) { 1591 ret = PTR_ERR(handle); 1592 mlog_errno(ret); 1593 goto out; 1594 } 1595 ret = ocfs2_journal_access(handle, inode, di_bh, 1596 OCFS2_JOURNAL_ACCESS_WRITE); 1597 if (ret) { 1598 mlog_errno(ret); 1599 goto out_commit; 1600 } 1601 1602 if (di->i_xattr_loc) { 1603 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1604 ocfs2_xattr_free_block(handle, osb, xb); 1605 di->i_xattr_loc = cpu_to_le64(0); 1606 } 1607 1608 spin_lock(&oi->ip_lock); 1609 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL); 1610 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1611 spin_unlock(&oi->ip_lock); 1612 1613 ret = ocfs2_journal_dirty(handle, di_bh); 1614 if (ret < 0) 1615 mlog_errno(ret); 1616 out_commit: 1617 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1618 out: 1619 brelse(blk_bh); 1620 1621 return ret; 1622 } 1623 1624 static int ocfs2_xattr_has_space_inline(struct inode *inode, 1625 struct ocfs2_dinode *di) 1626 { 1627 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1628 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size; 1629 int free; 1630 1631 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE) 1632 return 0; 1633 1634 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1635 struct ocfs2_inline_data *idata = &di->id2.i_data; 1636 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size); 1637 } else if (ocfs2_inode_is_fast_symlink(inode)) { 1638 free = ocfs2_fast_symlink_chars(inode->i_sb) - 1639 le64_to_cpu(di->i_size); 1640 } else { 1641 struct ocfs2_extent_list *el = &di->id2.i_list; 1642 free = (le16_to_cpu(el->l_count) - 1643 le16_to_cpu(el->l_next_free_rec)) * 1644 sizeof(struct ocfs2_extent_rec); 1645 } 1646 if (free >= xattrsize) 1647 return 1; 1648 1649 return 0; 1650 } 1651 1652 /* 1653 * ocfs2_xattr_ibody_find() 1654 * 1655 * Find extended attribute in inode block and 1656 * fill search info into struct ocfs2_xattr_search. 1657 */ 1658 static int ocfs2_xattr_ibody_find(struct inode *inode, 1659 int name_index, 1660 const char *name, 1661 struct ocfs2_xattr_search *xs) 1662 { 1663 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1664 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1665 int ret; 1666 int has_space = 0; 1667 1668 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1669 return 0; 1670 1671 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1672 down_read(&oi->ip_alloc_sem); 1673 has_space = ocfs2_xattr_has_space_inline(inode, di); 1674 up_read(&oi->ip_alloc_sem); 1675 if (!has_space) 1676 return 0; 1677 } 1678 1679 xs->xattr_bh = xs->inode_bh; 1680 xs->end = (void *)di + inode->i_sb->s_blocksize; 1681 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) 1682 xs->header = (struct ocfs2_xattr_header *) 1683 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 1684 else 1685 xs->header = (struct ocfs2_xattr_header *) 1686 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size); 1687 xs->base = (void *)xs->header; 1688 xs->here = xs->header->xh_entries; 1689 1690 /* Find the named attribute. */ 1691 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1692 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1693 if (ret && ret != -ENODATA) 1694 return ret; 1695 xs->not_found = ret; 1696 } 1697 1698 return 0; 1699 } 1700 1701 /* 1702 * ocfs2_xattr_ibody_set() 1703 * 1704 * Set, replace or remove an extended attribute into inode block. 1705 * 1706 */ 1707 static int ocfs2_xattr_ibody_set(struct inode *inode, 1708 struct ocfs2_xattr_info *xi, 1709 struct ocfs2_xattr_search *xs) 1710 { 1711 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1712 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1713 int ret; 1714 1715 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1716 return -ENOSPC; 1717 1718 down_write(&oi->ip_alloc_sem); 1719 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1720 if (!ocfs2_xattr_has_space_inline(inode, di)) { 1721 ret = -ENOSPC; 1722 goto out; 1723 } 1724 } 1725 1726 ret = ocfs2_xattr_set_entry(inode, xi, xs, 1727 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL)); 1728 out: 1729 up_write(&oi->ip_alloc_sem); 1730 1731 return ret; 1732 } 1733 1734 /* 1735 * ocfs2_xattr_block_find() 1736 * 1737 * Find extended attribute in external block and 1738 * fill search info into struct ocfs2_xattr_search. 1739 */ 1740 static int ocfs2_xattr_block_find(struct inode *inode, 1741 int name_index, 1742 const char *name, 1743 struct ocfs2_xattr_search *xs) 1744 { 1745 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1746 struct buffer_head *blk_bh = NULL; 1747 struct ocfs2_xattr_block *xb; 1748 int ret = 0; 1749 1750 if (!di->i_xattr_loc) 1751 return ret; 1752 1753 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1754 le64_to_cpu(di->i_xattr_loc), 1755 &blk_bh, OCFS2_BH_CACHED, inode); 1756 if (ret < 0) { 1757 mlog_errno(ret); 1758 return ret; 1759 } 1760 /*Verify the signature of xattr block*/ 1761 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE, 1762 strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) { 1763 ret = -EFAULT; 1764 goto cleanup; 1765 } 1766 1767 xs->xattr_bh = blk_bh; 1768 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1769 1770 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1771 xs->header = &xb->xb_attrs.xb_header; 1772 xs->base = (void *)xs->header; 1773 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 1774 xs->here = xs->header->xh_entries; 1775 1776 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1777 } else 1778 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 1779 name_index, 1780 name, xs); 1781 1782 if (ret && ret != -ENODATA) { 1783 xs->xattr_bh = NULL; 1784 goto cleanup; 1785 } 1786 xs->not_found = ret; 1787 return 0; 1788 cleanup: 1789 brelse(blk_bh); 1790 1791 return ret; 1792 } 1793 1794 /* 1795 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree 1796 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header 1797 * re-initialized. 1798 */ 1799 static int ocfs2_restore_xattr_block(struct inode *inode, 1800 struct ocfs2_xattr_search *xs) 1801 { 1802 int ret; 1803 handle_t *handle; 1804 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1805 struct ocfs2_xattr_block *xb = 1806 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1807 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 1808 u16 xb_flags = le16_to_cpu(xb->xb_flags); 1809 1810 BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) || 1811 le16_to_cpu(el->l_next_free_rec) != 0); 1812 1813 handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1814 if (IS_ERR(handle)) { 1815 ret = PTR_ERR(handle); 1816 handle = NULL; 1817 goto out; 1818 } 1819 1820 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1821 OCFS2_JOURNAL_ACCESS_WRITE); 1822 if (ret < 0) { 1823 mlog_errno(ret); 1824 goto out_commit; 1825 } 1826 1827 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 1828 offsetof(struct ocfs2_xattr_block, xb_attrs)); 1829 1830 xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED); 1831 1832 ocfs2_journal_dirty(handle, xs->xattr_bh); 1833 1834 out_commit: 1835 ocfs2_commit_trans(osb, handle); 1836 out: 1837 return ret; 1838 } 1839 1840 /* 1841 * ocfs2_xattr_block_set() 1842 * 1843 * Set, replace or remove an extended attribute into external block. 1844 * 1845 */ 1846 static int ocfs2_xattr_block_set(struct inode *inode, 1847 struct ocfs2_xattr_info *xi, 1848 struct ocfs2_xattr_search *xs) 1849 { 1850 struct buffer_head *new_bh = NULL; 1851 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1852 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1853 struct ocfs2_alloc_context *meta_ac = NULL; 1854 handle_t *handle = NULL; 1855 struct ocfs2_xattr_block *xblk = NULL; 1856 u16 suballoc_bit_start; 1857 u32 num_got; 1858 u64 first_blkno; 1859 int ret; 1860 1861 if (!xs->xattr_bh) { 1862 /* 1863 * Alloc one external block for extended attribute 1864 * outside of inode. 1865 */ 1866 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); 1867 if (ret < 0) { 1868 mlog_errno(ret); 1869 goto out; 1870 } 1871 handle = ocfs2_start_trans(osb, 1872 OCFS2_XATTR_BLOCK_CREATE_CREDITS); 1873 if (IS_ERR(handle)) { 1874 ret = PTR_ERR(handle); 1875 mlog_errno(ret); 1876 goto out; 1877 } 1878 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1879 OCFS2_JOURNAL_ACCESS_CREATE); 1880 if (ret < 0) { 1881 mlog_errno(ret); 1882 goto out_commit; 1883 } 1884 1885 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, 1886 &suballoc_bit_start, &num_got, 1887 &first_blkno); 1888 if (ret < 0) { 1889 mlog_errno(ret); 1890 goto out_commit; 1891 } 1892 1893 new_bh = sb_getblk(inode->i_sb, first_blkno); 1894 ocfs2_set_new_buffer_uptodate(inode, new_bh); 1895 1896 ret = ocfs2_journal_access(handle, inode, new_bh, 1897 OCFS2_JOURNAL_ACCESS_CREATE); 1898 if (ret < 0) { 1899 mlog_errno(ret); 1900 goto out_commit; 1901 } 1902 1903 /* Initialize ocfs2_xattr_block */ 1904 xs->xattr_bh = new_bh; 1905 xblk = (struct ocfs2_xattr_block *)new_bh->b_data; 1906 memset(xblk, 0, inode->i_sb->s_blocksize); 1907 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE); 1908 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num); 1909 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start); 1910 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation); 1911 xblk->xb_blkno = cpu_to_le64(first_blkno); 1912 1913 xs->header = &xblk->xb_attrs.xb_header; 1914 xs->base = (void *)xs->header; 1915 xs->end = (void *)xblk + inode->i_sb->s_blocksize; 1916 xs->here = xs->header->xh_entries; 1917 1918 1919 ret = ocfs2_journal_dirty(handle, new_bh); 1920 if (ret < 0) { 1921 mlog_errno(ret); 1922 goto out_commit; 1923 } 1924 di->i_xattr_loc = cpu_to_le64(first_blkno); 1925 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1926 if (ret < 0) 1927 mlog_errno(ret); 1928 out_commit: 1929 ocfs2_commit_trans(osb, handle); 1930 out: 1931 if (meta_ac) 1932 ocfs2_free_alloc_context(meta_ac); 1933 if (ret < 0) 1934 return ret; 1935 } else 1936 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1937 1938 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) { 1939 /* Set extended attribute into external block */ 1940 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL); 1941 if (!ret || ret != -ENOSPC) 1942 goto end; 1943 1944 ret = ocfs2_xattr_create_index_block(inode, xs); 1945 if (ret) 1946 goto end; 1947 } 1948 1949 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs); 1950 if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0) 1951 ret = ocfs2_restore_xattr_block(inode, xs); 1952 1953 end: 1954 1955 return ret; 1956 } 1957 1958 /* 1959 * ocfs2_xattr_set() 1960 * 1961 * Set, replace or remove an extended attribute for this inode. 1962 * value is NULL to remove an existing extended attribute, else either 1963 * create or replace an extended attribute. 1964 */ 1965 int ocfs2_xattr_set(struct inode *inode, 1966 int name_index, 1967 const char *name, 1968 const void *value, 1969 size_t value_len, 1970 int flags) 1971 { 1972 struct buffer_head *di_bh = NULL; 1973 struct ocfs2_dinode *di; 1974 int ret; 1975 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 1976 1977 struct ocfs2_xattr_info xi = { 1978 .name_index = name_index, 1979 .name = name, 1980 .value = value, 1981 .value_len = value_len, 1982 }; 1983 1984 struct ocfs2_xattr_search xis = { 1985 .not_found = -ENODATA, 1986 }; 1987 1988 struct ocfs2_xattr_search xbs = { 1989 .not_found = -ENODATA, 1990 }; 1991 1992 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 1993 return -EOPNOTSUPP; 1994 1995 ret = ocfs2_inode_lock(inode, &di_bh, 1); 1996 if (ret < 0) { 1997 mlog_errno(ret); 1998 return ret; 1999 } 2000 xis.inode_bh = xbs.inode_bh = di_bh; 2001 di = (struct ocfs2_dinode *)di_bh->b_data; 2002 2003 down_write(&OCFS2_I(inode)->ip_xattr_sem); 2004 /* 2005 * Scan inode and external block to find the same name 2006 * extended attribute and collect search infomation. 2007 */ 2008 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis); 2009 if (ret) 2010 goto cleanup; 2011 if (xis.not_found) { 2012 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs); 2013 if (ret) 2014 goto cleanup; 2015 } 2016 2017 if (xis.not_found && xbs.not_found) { 2018 ret = -ENODATA; 2019 if (flags & XATTR_REPLACE) 2020 goto cleanup; 2021 ret = 0; 2022 if (!value) 2023 goto cleanup; 2024 } else { 2025 ret = -EEXIST; 2026 if (flags & XATTR_CREATE) 2027 goto cleanup; 2028 } 2029 2030 if (!value) { 2031 /* Remove existing extended attribute */ 2032 if (!xis.not_found) 2033 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2034 else if (!xbs.not_found) 2035 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2036 } else { 2037 /* We always try to set extended attribute into inode first*/ 2038 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2039 if (!ret && !xbs.not_found) { 2040 /* 2041 * If succeed and that extended attribute existing in 2042 * external block, then we will remove it. 2043 */ 2044 xi.value = NULL; 2045 xi.value_len = 0; 2046 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2047 } else if (ret == -ENOSPC) { 2048 if (di->i_xattr_loc && !xbs.xattr_bh) { 2049 ret = ocfs2_xattr_block_find(inode, name_index, 2050 name, &xbs); 2051 if (ret) 2052 goto cleanup; 2053 } 2054 /* 2055 * If no space in inode, we will set extended attribute 2056 * into external block. 2057 */ 2058 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2059 if (ret) 2060 goto cleanup; 2061 if (!xis.not_found) { 2062 /* 2063 * If succeed and that extended attribute 2064 * existing in inode, we will remove it. 2065 */ 2066 xi.value = NULL; 2067 xi.value_len = 0; 2068 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2069 } 2070 } 2071 } 2072 cleanup: 2073 up_write(&OCFS2_I(inode)->ip_xattr_sem); 2074 ocfs2_inode_unlock(inode, 1); 2075 brelse(di_bh); 2076 brelse(xbs.xattr_bh); 2077 for (i = 0; i < blk_per_bucket; i++) 2078 brelse(xbs.bucket.bhs[i]); 2079 2080 return ret; 2081 } 2082 2083 static inline u32 ocfs2_xattr_hash_by_name(struct inode *inode, 2084 int name_index, 2085 const char *suffix_name) 2086 { 2087 struct xattr_handler *handler = ocfs2_xattr_handler(name_index); 2088 char *prefix = handler->prefix; 2089 int prefix_len = strlen(handler->prefix); 2090 2091 return ocfs2_xattr_name_hash(inode, prefix, prefix_len, 2092 (char *)suffix_name, strlen(suffix_name)); 2093 } 2094 2095 /* 2096 * Find the xattr extent rec which may contains name_hash. 2097 * e_cpos will be the first name hash of the xattr rec. 2098 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list. 2099 */ 2100 static int ocfs2_xattr_get_rec(struct inode *inode, 2101 u32 name_hash, 2102 u64 *p_blkno, 2103 u32 *e_cpos, 2104 u32 *num_clusters, 2105 struct ocfs2_extent_list *el) 2106 { 2107 int ret = 0, i; 2108 struct buffer_head *eb_bh = NULL; 2109 struct ocfs2_extent_block *eb; 2110 struct ocfs2_extent_rec *rec = NULL; 2111 u64 e_blkno = 0; 2112 2113 if (el->l_tree_depth) { 2114 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh); 2115 if (ret) { 2116 mlog_errno(ret); 2117 goto out; 2118 } 2119 2120 eb = (struct ocfs2_extent_block *) eb_bh->b_data; 2121 el = &eb->h_list; 2122 2123 if (el->l_tree_depth) { 2124 ocfs2_error(inode->i_sb, 2125 "Inode %lu has non zero tree depth in " 2126 "xattr tree block %llu\n", inode->i_ino, 2127 (unsigned long long)eb_bh->b_blocknr); 2128 ret = -EROFS; 2129 goto out; 2130 } 2131 } 2132 2133 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { 2134 rec = &el->l_recs[i]; 2135 2136 if (le32_to_cpu(rec->e_cpos) <= name_hash) { 2137 e_blkno = le64_to_cpu(rec->e_blkno); 2138 break; 2139 } 2140 } 2141 2142 if (!e_blkno) { 2143 ocfs2_error(inode->i_sb, "Inode %lu has bad extent " 2144 "record (%u, %u, 0) in xattr", inode->i_ino, 2145 le32_to_cpu(rec->e_cpos), 2146 ocfs2_rec_clusters(el, rec)); 2147 ret = -EROFS; 2148 goto out; 2149 } 2150 2151 *p_blkno = le64_to_cpu(rec->e_blkno); 2152 *num_clusters = le16_to_cpu(rec->e_leaf_clusters); 2153 if (e_cpos) 2154 *e_cpos = le32_to_cpu(rec->e_cpos); 2155 out: 2156 brelse(eb_bh); 2157 return ret; 2158 } 2159 2160 typedef int (xattr_bucket_func)(struct inode *inode, 2161 struct ocfs2_xattr_bucket *bucket, 2162 void *para); 2163 2164 static int ocfs2_find_xe_in_bucket(struct inode *inode, 2165 struct buffer_head *header_bh, 2166 int name_index, 2167 const char *name, 2168 u32 name_hash, 2169 u16 *xe_index, 2170 int *found) 2171 { 2172 int i, ret = 0, cmp = 1, block_off, new_offset; 2173 struct ocfs2_xattr_header *xh = 2174 (struct ocfs2_xattr_header *)header_bh->b_data; 2175 size_t name_len = strlen(name); 2176 struct ocfs2_xattr_entry *xe = NULL; 2177 struct buffer_head *name_bh = NULL; 2178 char *xe_name; 2179 2180 /* 2181 * We don't use binary search in the bucket because there 2182 * may be multiple entries with the same name hash. 2183 */ 2184 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 2185 xe = &xh->xh_entries[i]; 2186 2187 if (name_hash > le32_to_cpu(xe->xe_name_hash)) 2188 continue; 2189 else if (name_hash < le32_to_cpu(xe->xe_name_hash)) 2190 break; 2191 2192 cmp = name_index - ocfs2_xattr_get_type(xe); 2193 if (!cmp) 2194 cmp = name_len - xe->xe_name_len; 2195 if (cmp) 2196 continue; 2197 2198 ret = ocfs2_xattr_bucket_get_name_value(inode, 2199 xh, 2200 i, 2201 &block_off, 2202 &new_offset); 2203 if (ret) { 2204 mlog_errno(ret); 2205 break; 2206 } 2207 2208 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), 2209 header_bh->b_blocknr + block_off, 2210 &name_bh, OCFS2_BH_CACHED, inode); 2211 if (ret) { 2212 mlog_errno(ret); 2213 break; 2214 } 2215 xe_name = name_bh->b_data + new_offset; 2216 2217 cmp = memcmp(name, xe_name, name_len); 2218 brelse(name_bh); 2219 name_bh = NULL; 2220 2221 if (cmp == 0) { 2222 *xe_index = i; 2223 *found = 1; 2224 ret = 0; 2225 break; 2226 } 2227 } 2228 2229 return ret; 2230 } 2231 2232 /* 2233 * Find the specified xattr entry in a series of buckets. 2234 * This series start from p_blkno and last for num_clusters. 2235 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains 2236 * the num of the valid buckets. 2237 * 2238 * Return the buffer_head this xattr should reside in. And if the xattr's 2239 * hash is in the gap of 2 buckets, return the lower bucket. 2240 */ 2241 static int ocfs2_xattr_bucket_find(struct inode *inode, 2242 int name_index, 2243 const char *name, 2244 u32 name_hash, 2245 u64 p_blkno, 2246 u32 first_hash, 2247 u32 num_clusters, 2248 struct ocfs2_xattr_search *xs) 2249 { 2250 int ret, found = 0; 2251 struct buffer_head *bh = NULL; 2252 struct buffer_head *lower_bh = NULL; 2253 struct ocfs2_xattr_header *xh = NULL; 2254 struct ocfs2_xattr_entry *xe = NULL; 2255 u16 index = 0; 2256 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2257 int low_bucket = 0, bucket, high_bucket; 2258 u32 last_hash; 2259 u64 blkno; 2260 2261 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, 2262 &bh, OCFS2_BH_CACHED, inode); 2263 if (ret) { 2264 mlog_errno(ret); 2265 goto out; 2266 } 2267 2268 xh = (struct ocfs2_xattr_header *)bh->b_data; 2269 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1; 2270 2271 while (low_bucket <= high_bucket) { 2272 brelse(bh); 2273 bh = NULL; 2274 bucket = (low_bucket + high_bucket) / 2; 2275 2276 blkno = p_blkno + bucket * blk_per_bucket; 2277 2278 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno, 2279 &bh, OCFS2_BH_CACHED, inode); 2280 if (ret) { 2281 mlog_errno(ret); 2282 goto out; 2283 } 2284 2285 xh = (struct ocfs2_xattr_header *)bh->b_data; 2286 xe = &xh->xh_entries[0]; 2287 if (name_hash < le32_to_cpu(xe->xe_name_hash)) { 2288 high_bucket = bucket - 1; 2289 continue; 2290 } 2291 2292 /* 2293 * Check whether the hash of the last entry in our 2294 * bucket is larger than the search one. 2295 */ 2296 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1]; 2297 last_hash = le32_to_cpu(xe->xe_name_hash); 2298 2299 /* record lower_bh which may be the insert place. */ 2300 brelse(lower_bh); 2301 lower_bh = bh; 2302 bh = NULL; 2303 2304 if (name_hash > le32_to_cpu(xe->xe_name_hash)) { 2305 low_bucket = bucket + 1; 2306 continue; 2307 } 2308 2309 /* the searched xattr should reside in this bucket if exists. */ 2310 ret = ocfs2_find_xe_in_bucket(inode, lower_bh, 2311 name_index, name, name_hash, 2312 &index, &found); 2313 if (ret) { 2314 mlog_errno(ret); 2315 goto out; 2316 } 2317 break; 2318 } 2319 2320 /* 2321 * Record the bucket we have found. 2322 * When the xattr's hash value is in the gap of 2 buckets, we will 2323 * always set it to the previous bucket. 2324 */ 2325 if (!lower_bh) { 2326 /* 2327 * We can't find any bucket whose first name_hash is less 2328 * than the find name_hash. 2329 */ 2330 BUG_ON(bh->b_blocknr != p_blkno); 2331 lower_bh = bh; 2332 bh = NULL; 2333 } 2334 xs->bucket.bhs[0] = lower_bh; 2335 xs->bucket.xh = (struct ocfs2_xattr_header *) 2336 xs->bucket.bhs[0]->b_data; 2337 lower_bh = NULL; 2338 2339 xs->header = xs->bucket.xh; 2340 xs->base = xs->bucket.bhs[0]->b_data; 2341 xs->end = xs->base + inode->i_sb->s_blocksize; 2342 2343 if (found) { 2344 /* 2345 * If we have found the xattr enty, read all the blocks in 2346 * this bucket. 2347 */ 2348 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2349 xs->bucket.bhs[0]->b_blocknr + 1, 2350 blk_per_bucket - 1, &xs->bucket.bhs[1], 2351 OCFS2_BH_CACHED, inode); 2352 if (ret) { 2353 mlog_errno(ret); 2354 goto out; 2355 } 2356 2357 xs->here = &xs->header->xh_entries[index]; 2358 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name, 2359 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index); 2360 } else 2361 ret = -ENODATA; 2362 2363 out: 2364 brelse(bh); 2365 brelse(lower_bh); 2366 return ret; 2367 } 2368 2369 static int ocfs2_xattr_index_block_find(struct inode *inode, 2370 struct buffer_head *root_bh, 2371 int name_index, 2372 const char *name, 2373 struct ocfs2_xattr_search *xs) 2374 { 2375 int ret; 2376 struct ocfs2_xattr_block *xb = 2377 (struct ocfs2_xattr_block *)root_bh->b_data; 2378 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 2379 struct ocfs2_extent_list *el = &xb_root->xt_list; 2380 u64 p_blkno = 0; 2381 u32 first_hash, num_clusters = 0; 2382 u32 name_hash = ocfs2_xattr_hash_by_name(inode, name_index, name); 2383 2384 if (le16_to_cpu(el->l_next_free_rec) == 0) 2385 return -ENODATA; 2386 2387 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n", 2388 name, name_hash, name_index); 2389 2390 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash, 2391 &num_clusters, el); 2392 if (ret) { 2393 mlog_errno(ret); 2394 goto out; 2395 } 2396 2397 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash); 2398 2399 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash " 2400 "in the rec is %u\n", num_clusters, p_blkno, first_hash); 2401 2402 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash, 2403 p_blkno, first_hash, num_clusters, xs); 2404 2405 out: 2406 return ret; 2407 } 2408 2409 static int ocfs2_iterate_xattr_buckets(struct inode *inode, 2410 u64 blkno, 2411 u32 clusters, 2412 xattr_bucket_func *func, 2413 void *para) 2414 { 2415 int i, j, ret = 0; 2416 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2417 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)); 2418 u32 num_buckets = clusters * bpc; 2419 struct ocfs2_xattr_bucket bucket; 2420 2421 memset(&bucket, 0, sizeof(bucket)); 2422 2423 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n", 2424 clusters, blkno); 2425 2426 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) { 2427 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2428 blkno, blk_per_bucket, 2429 bucket.bhs, OCFS2_BH_CACHED, inode); 2430 if (ret) { 2431 mlog_errno(ret); 2432 goto out; 2433 } 2434 2435 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data; 2436 /* 2437 * The real bucket num in this series of blocks is stored 2438 * in the 1st bucket. 2439 */ 2440 if (i == 0) 2441 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets); 2442 2443 mlog(0, "iterating xattr bucket %llu\n", blkno); 2444 if (func) { 2445 ret = func(inode, &bucket, para); 2446 if (ret) { 2447 mlog_errno(ret); 2448 break; 2449 } 2450 } 2451 2452 for (j = 0; j < blk_per_bucket; j++) 2453 brelse(bucket.bhs[j]); 2454 memset(&bucket, 0, sizeof(bucket)); 2455 } 2456 2457 out: 2458 for (j = 0; j < blk_per_bucket; j++) 2459 brelse(bucket.bhs[j]); 2460 2461 return ret; 2462 } 2463 2464 struct ocfs2_xattr_tree_list { 2465 char *buffer; 2466 size_t buffer_size; 2467 }; 2468 2469 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, 2470 struct ocfs2_xattr_header *xh, 2471 int index, 2472 int *block_off, 2473 int *new_offset) 2474 { 2475 u16 name_offset; 2476 2477 if (index < 0 || index >= le16_to_cpu(xh->xh_count)) 2478 return -EINVAL; 2479 2480 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset); 2481 2482 *block_off = name_offset >> inode->i_sb->s_blocksize_bits; 2483 *new_offset = name_offset % inode->i_sb->s_blocksize; 2484 2485 return 0; 2486 } 2487 2488 static int ocfs2_list_xattr_bucket(struct inode *inode, 2489 struct ocfs2_xattr_bucket *bucket, 2490 void *para) 2491 { 2492 int ret = 0; 2493 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para; 2494 size_t size; 2495 int i, block_off, new_offset; 2496 2497 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) { 2498 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i]; 2499 struct xattr_handler *handler = 2500 ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); 2501 2502 if (handler) { 2503 ret = ocfs2_xattr_bucket_get_name_value(inode, 2504 bucket->xh, 2505 i, 2506 &block_off, 2507 &new_offset); 2508 if (ret) 2509 break; 2510 size = handler->list(inode, xl->buffer, xl->buffer_size, 2511 bucket->bhs[block_off]->b_data + 2512 new_offset, 2513 entry->xe_name_len); 2514 if (xl->buffer) { 2515 if (size > xl->buffer_size) 2516 return -ERANGE; 2517 xl->buffer += size; 2518 } 2519 xl->buffer_size -= size; 2520 } 2521 } 2522 2523 return ret; 2524 } 2525 2526 static int ocfs2_xattr_tree_list_index_block(struct inode *inode, 2527 struct ocfs2_xattr_tree_root *xt, 2528 char *buffer, 2529 size_t buffer_size) 2530 { 2531 struct ocfs2_extent_list *el = &xt->xt_list; 2532 int ret = 0; 2533 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0; 2534 u64 p_blkno = 0; 2535 struct ocfs2_xattr_tree_list xl = { 2536 .buffer = buffer, 2537 .buffer_size = buffer_size, 2538 }; 2539 2540 if (le16_to_cpu(el->l_next_free_rec) == 0) 2541 return 0; 2542 2543 while (name_hash > 0) { 2544 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 2545 &e_cpos, &num_clusters, el); 2546 if (ret) { 2547 mlog_errno(ret); 2548 goto out; 2549 } 2550 2551 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 2552 ocfs2_list_xattr_bucket, 2553 &xl); 2554 if (ret) { 2555 mlog_errno(ret); 2556 goto out; 2557 } 2558 2559 if (e_cpos == 0) 2560 break; 2561 2562 name_hash = e_cpos - 1; 2563 } 2564 2565 ret = buffer_size - xl.buffer_size; 2566 out: 2567 return ret; 2568 } 2569 2570 static int cmp_xe(const void *a, const void *b) 2571 { 2572 const struct ocfs2_xattr_entry *l = a, *r = b; 2573 u32 l_hash = le32_to_cpu(l->xe_name_hash); 2574 u32 r_hash = le32_to_cpu(r->xe_name_hash); 2575 2576 if (l_hash > r_hash) 2577 return 1; 2578 if (l_hash < r_hash) 2579 return -1; 2580 return 0; 2581 } 2582 2583 static void swap_xe(void *a, void *b, int size) 2584 { 2585 struct ocfs2_xattr_entry *l = a, *r = b, tmp; 2586 2587 tmp = *l; 2588 memcpy(l, r, sizeof(struct ocfs2_xattr_entry)); 2589 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry)); 2590 } 2591 2592 /* 2593 * When the ocfs2_xattr_block is filled up, new bucket will be created 2594 * and all the xattr entries will be moved to the new bucket. 2595 * Note: we need to sort the entries since they are not saved in order 2596 * in the ocfs2_xattr_block. 2597 */ 2598 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode, 2599 struct buffer_head *xb_bh, 2600 struct buffer_head *xh_bh, 2601 struct buffer_head *data_bh) 2602 { 2603 int i, blocksize = inode->i_sb->s_blocksize; 2604 u16 offset, size, off_change; 2605 struct ocfs2_xattr_entry *xe; 2606 struct ocfs2_xattr_block *xb = 2607 (struct ocfs2_xattr_block *)xb_bh->b_data; 2608 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header; 2609 struct ocfs2_xattr_header *xh = 2610 (struct ocfs2_xattr_header *)xh_bh->b_data; 2611 u16 count = le16_to_cpu(xb_xh->xh_count); 2612 char *target = xh_bh->b_data, *src = xb_bh->b_data; 2613 2614 mlog(0, "cp xattr from block %llu to bucket %llu\n", 2615 (unsigned long long)xb_bh->b_blocknr, 2616 (unsigned long long)xh_bh->b_blocknr); 2617 2618 memset(xh_bh->b_data, 0, blocksize); 2619 if (data_bh) 2620 memset(data_bh->b_data, 0, blocksize); 2621 /* 2622 * Since the xe_name_offset is based on ocfs2_xattr_header, 2623 * there is a offset change corresponding to the change of 2624 * ocfs2_xattr_header's position. 2625 */ 2626 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2627 xe = &xb_xh->xh_entries[count - 1]; 2628 offset = le16_to_cpu(xe->xe_name_offset) + off_change; 2629 size = blocksize - offset; 2630 2631 /* copy all the names and values. */ 2632 if (data_bh) 2633 target = data_bh->b_data; 2634 memcpy(target + offset, src + offset, size); 2635 2636 /* Init new header now. */ 2637 xh->xh_count = xb_xh->xh_count; 2638 xh->xh_num_buckets = cpu_to_le16(1); 2639 xh->xh_name_value_len = cpu_to_le16(size); 2640 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size); 2641 2642 /* copy all the entries. */ 2643 target = xh_bh->b_data; 2644 offset = offsetof(struct ocfs2_xattr_header, xh_entries); 2645 size = count * sizeof(struct ocfs2_xattr_entry); 2646 memcpy(target + offset, (char *)xb_xh + offset, size); 2647 2648 /* Change the xe offset for all the xe because of the move. */ 2649 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize + 2650 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2651 for (i = 0; i < count; i++) 2652 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change); 2653 2654 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n", 2655 offset, size, off_change); 2656 2657 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry), 2658 cmp_xe, swap_xe); 2659 } 2660 2661 /* 2662 * After we move xattr from block to index btree, we have to 2663 * update ocfs2_xattr_search to the new xe and base. 2664 * 2665 * When the entry is in xattr block, xattr_bh indicates the storage place. 2666 * While if the entry is in index b-tree, "bucket" indicates the 2667 * real place of the xattr. 2668 */ 2669 static int ocfs2_xattr_update_xattr_search(struct inode *inode, 2670 struct ocfs2_xattr_search *xs, 2671 struct buffer_head *old_bh, 2672 struct buffer_head *new_bh) 2673 { 2674 int ret = 0; 2675 char *buf = old_bh->b_data; 2676 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf; 2677 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header; 2678 int i, blocksize = inode->i_sb->s_blocksize; 2679 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2680 2681 xs->bucket.bhs[0] = new_bh; 2682 get_bh(new_bh); 2683 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data; 2684 xs->header = xs->bucket.xh; 2685 2686 xs->base = new_bh->b_data; 2687 xs->end = xs->base + inode->i_sb->s_blocksize; 2688 2689 if (!xs->not_found) { 2690 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) { 2691 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), 2692 xs->bucket.bhs[0]->b_blocknr + 1, 2693 blk_per_bucket - 1, &xs->bucket.bhs[1], 2694 OCFS2_BH_CACHED, inode); 2695 if (ret) { 2696 mlog_errno(ret); 2697 return ret; 2698 } 2699 2700 i = xs->here - old_xh->xh_entries; 2701 xs->here = &xs->header->xh_entries[i]; 2702 } 2703 } 2704 2705 return ret; 2706 } 2707 2708 static int ocfs2_xattr_create_index_block(struct inode *inode, 2709 struct ocfs2_xattr_search *xs) 2710 { 2711 int ret, credits = OCFS2_SUBALLOC_ALLOC; 2712 u32 bit_off, len; 2713 u64 blkno; 2714 handle_t *handle; 2715 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2716 struct ocfs2_inode_info *oi = OCFS2_I(inode); 2717 struct ocfs2_alloc_context *data_ac; 2718 struct buffer_head *xh_bh = NULL, *data_bh = NULL; 2719 struct buffer_head *xb_bh = xs->xattr_bh; 2720 struct ocfs2_xattr_block *xb = 2721 (struct ocfs2_xattr_block *)xb_bh->b_data; 2722 struct ocfs2_xattr_tree_root *xr; 2723 u16 xb_flags = le16_to_cpu(xb->xb_flags); 2724 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2725 2726 mlog(0, "create xattr index block for %llu\n", 2727 (unsigned long long)xb_bh->b_blocknr); 2728 2729 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED); 2730 2731 ret = ocfs2_reserve_clusters(osb, 1, &data_ac); 2732 if (ret) { 2733 mlog_errno(ret); 2734 goto out; 2735 } 2736 2737 /* 2738 * XXX: 2739 * We can use this lock for now, and maybe move to a dedicated mutex 2740 * if performance becomes a problem later. 2741 */ 2742 down_write(&oi->ip_alloc_sem); 2743 2744 /* 2745 * 3 more credits, one for xattr block update, one for the 1st block 2746 * of the new xattr bucket and one for the value/data. 2747 */ 2748 credits += 3; 2749 handle = ocfs2_start_trans(osb, credits); 2750 if (IS_ERR(handle)) { 2751 ret = PTR_ERR(handle); 2752 mlog_errno(ret); 2753 goto out_sem; 2754 } 2755 2756 ret = ocfs2_journal_access(handle, inode, xb_bh, 2757 OCFS2_JOURNAL_ACCESS_WRITE); 2758 if (ret) { 2759 mlog_errno(ret); 2760 goto out_commit; 2761 } 2762 2763 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len); 2764 if (ret) { 2765 mlog_errno(ret); 2766 goto out_commit; 2767 } 2768 2769 /* 2770 * The bucket may spread in many blocks, and 2771 * we will only touch the 1st block and the last block 2772 * in the whole bucket(one for entry and one for data). 2773 */ 2774 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off); 2775 2776 mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno); 2777 2778 xh_bh = sb_getblk(inode->i_sb, blkno); 2779 if (!xh_bh) { 2780 ret = -EIO; 2781 mlog_errno(ret); 2782 goto out_commit; 2783 } 2784 2785 ocfs2_set_new_buffer_uptodate(inode, xh_bh); 2786 2787 ret = ocfs2_journal_access(handle, inode, xh_bh, 2788 OCFS2_JOURNAL_ACCESS_CREATE); 2789 if (ret) { 2790 mlog_errno(ret); 2791 goto out_commit; 2792 } 2793 2794 if (bpb > 1) { 2795 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1); 2796 if (!data_bh) { 2797 ret = -EIO; 2798 mlog_errno(ret); 2799 goto out_commit; 2800 } 2801 2802 ocfs2_set_new_buffer_uptodate(inode, data_bh); 2803 2804 ret = ocfs2_journal_access(handle, inode, data_bh, 2805 OCFS2_JOURNAL_ACCESS_CREATE); 2806 if (ret) { 2807 mlog_errno(ret); 2808 goto out_commit; 2809 } 2810 } 2811 2812 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh); 2813 2814 ocfs2_journal_dirty(handle, xh_bh); 2815 if (data_bh) 2816 ocfs2_journal_dirty(handle, data_bh); 2817 2818 ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh); 2819 2820 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */ 2821 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 2822 offsetof(struct ocfs2_xattr_block, xb_attrs)); 2823 2824 xr = &xb->xb_attrs.xb_root; 2825 xr->xt_clusters = cpu_to_le32(1); 2826 xr->xt_last_eb_blk = 0; 2827 xr->xt_list.l_tree_depth = 0; 2828 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb)); 2829 xr->xt_list.l_next_free_rec = cpu_to_le16(1); 2830 2831 xr->xt_list.l_recs[0].e_cpos = 0; 2832 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno); 2833 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1); 2834 2835 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED); 2836 2837 ret = ocfs2_journal_dirty(handle, xb_bh); 2838 if (ret) { 2839 mlog_errno(ret); 2840 goto out_commit; 2841 } 2842 2843 out_commit: 2844 ocfs2_commit_trans(osb, handle); 2845 2846 out_sem: 2847 up_write(&oi->ip_alloc_sem); 2848 2849 out: 2850 if (data_ac) 2851 ocfs2_free_alloc_context(data_ac); 2852 2853 brelse(xh_bh); 2854 brelse(data_bh); 2855 2856 return ret; 2857 } 2858 2859 static int cmp_xe_offset(const void *a, const void *b) 2860 { 2861 const struct ocfs2_xattr_entry *l = a, *r = b; 2862 u32 l_name_offset = le16_to_cpu(l->xe_name_offset); 2863 u32 r_name_offset = le16_to_cpu(r->xe_name_offset); 2864 2865 if (l_name_offset < r_name_offset) 2866 return 1; 2867 if (l_name_offset > r_name_offset) 2868 return -1; 2869 return 0; 2870 } 2871 2872 /* 2873 * defrag a xattr bucket if we find that the bucket has some 2874 * holes beteen name/value pairs. 2875 * We will move all the name/value pairs to the end of the bucket 2876 * so that we can spare some space for insertion. 2877 */ 2878 static int ocfs2_defrag_xattr_bucket(struct inode *inode, 2879 struct ocfs2_xattr_bucket *bucket) 2880 { 2881 int ret, i; 2882 size_t end, offset, len, value_len; 2883 struct ocfs2_xattr_header *xh; 2884 char *entries, *buf, *bucket_buf = NULL; 2885 u64 blkno = bucket->bhs[0]->b_blocknr; 2886 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2887 u16 xh_free_start; 2888 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2889 size_t blocksize = inode->i_sb->s_blocksize; 2890 handle_t *handle; 2891 struct buffer_head **bhs; 2892 struct ocfs2_xattr_entry *xe; 2893 2894 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 2895 GFP_NOFS); 2896 if (!bhs) 2897 return -ENOMEM; 2898 2899 ret = ocfs2_read_blocks(osb, blkno, blk_per_bucket, bhs, 2900 OCFS2_BH_CACHED, inode); 2901 if (ret) 2902 goto out; 2903 2904 /* 2905 * In order to make the operation more efficient and generic, 2906 * we copy all the blocks into a contiguous memory and do the 2907 * defragment there, so if anything is error, we will not touch 2908 * the real block. 2909 */ 2910 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS); 2911 if (!bucket_buf) { 2912 ret = -EIO; 2913 goto out; 2914 } 2915 2916 buf = bucket_buf; 2917 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) 2918 memcpy(buf, bhs[i]->b_data, blocksize); 2919 2920 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket); 2921 if (IS_ERR(handle)) { 2922 ret = PTR_ERR(handle); 2923 handle = NULL; 2924 mlog_errno(ret); 2925 goto out; 2926 } 2927 2928 for (i = 0; i < blk_per_bucket; i++) { 2929 ret = ocfs2_journal_access(handle, inode, bhs[i], 2930 OCFS2_JOURNAL_ACCESS_WRITE); 2931 if (ret < 0) { 2932 mlog_errno(ret); 2933 goto commit; 2934 } 2935 } 2936 2937 xh = (struct ocfs2_xattr_header *)bucket_buf; 2938 entries = (char *)xh->xh_entries; 2939 xh_free_start = le16_to_cpu(xh->xh_free_start); 2940 2941 mlog(0, "adjust xattr bucket in %llu, count = %u, " 2942 "xh_free_start = %u, xh_name_value_len = %u.\n", 2943 blkno, le16_to_cpu(xh->xh_count), xh_free_start, 2944 le16_to_cpu(xh->xh_name_value_len)); 2945 2946 /* 2947 * sort all the entries by their offset. 2948 * the largest will be the first, so that we can 2949 * move them to the end one by one. 2950 */ 2951 sort(entries, le16_to_cpu(xh->xh_count), 2952 sizeof(struct ocfs2_xattr_entry), 2953 cmp_xe_offset, swap_xe); 2954 2955 /* Move all name/values to the end of the bucket. */ 2956 xe = xh->xh_entries; 2957 end = OCFS2_XATTR_BUCKET_SIZE; 2958 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) { 2959 offset = le16_to_cpu(xe->xe_name_offset); 2960 if (ocfs2_xattr_is_local(xe)) 2961 value_len = OCFS2_XATTR_SIZE( 2962 le64_to_cpu(xe->xe_value_size)); 2963 else 2964 value_len = OCFS2_XATTR_ROOT_SIZE; 2965 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len; 2966 2967 /* 2968 * We must make sure that the name/value pair 2969 * exist in the same block. So adjust end to 2970 * the previous block end if needed. 2971 */ 2972 if (((end - len) / blocksize != 2973 (end - 1) / blocksize)) 2974 end = end - end % blocksize; 2975 2976 if (end > offset + len) { 2977 memmove(bucket_buf + end - len, 2978 bucket_buf + offset, len); 2979 xe->xe_name_offset = cpu_to_le16(end - len); 2980 } 2981 2982 mlog_bug_on_msg(end < offset + len, "Defrag check failed for " 2983 "bucket %llu\n", (unsigned long long)blkno); 2984 2985 end -= len; 2986 } 2987 2988 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for " 2989 "bucket %llu\n", (unsigned long long)blkno); 2990 2991 if (xh_free_start == end) 2992 goto commit; 2993 2994 memset(bucket_buf + xh_free_start, 0, end - xh_free_start); 2995 xh->xh_free_start = cpu_to_le16(end); 2996 2997 /* sort the entries by their name_hash. */ 2998 sort(entries, le16_to_cpu(xh->xh_count), 2999 sizeof(struct ocfs2_xattr_entry), 3000 cmp_xe, swap_xe); 3001 3002 buf = bucket_buf; 3003 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) { 3004 memcpy(bhs[i]->b_data, buf, blocksize); 3005 ocfs2_journal_dirty(handle, bhs[i]); 3006 } 3007 3008 commit: 3009 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 3010 out: 3011 3012 if (bhs) { 3013 for (i = 0; i < blk_per_bucket; i++) 3014 brelse(bhs[i]); 3015 } 3016 kfree(bhs); 3017 3018 kfree(bucket_buf); 3019 return ret; 3020 } 3021 3022 /* 3023 * Move half nums of the xattr bucket in the previous cluster to this new 3024 * cluster. We only touch the last cluster of the previous extend record. 3025 * 3026 * first_bh is the first buffer_head of a series of bucket in the same 3027 * extent rec and header_bh is the header of one bucket in this cluster. 3028 * They will be updated if we move the data header_bh contains to the new 3029 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster. 3030 */ 3031 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode, 3032 handle_t *handle, 3033 struct buffer_head **first_bh, 3034 struct buffer_head **header_bh, 3035 u64 new_blkno, 3036 u64 prev_blkno, 3037 u32 num_clusters, 3038 u32 *first_hash) 3039 { 3040 int i, ret, credits; 3041 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3042 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3043 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3044 int blocksize = inode->i_sb->s_blocksize; 3045 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL; 3046 struct ocfs2_xattr_header *new_xh; 3047 struct ocfs2_xattr_header *xh = 3048 (struct ocfs2_xattr_header *)((*first_bh)->b_data); 3049 3050 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets); 3051 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize); 3052 3053 prev_bh = *first_bh; 3054 get_bh(prev_bh); 3055 xh = (struct ocfs2_xattr_header *)prev_bh->b_data; 3056 3057 prev_blkno += (num_clusters - 1) * bpc + bpc / 2; 3058 3059 mlog(0, "move half of xattrs in cluster %llu to %llu\n", 3060 prev_blkno, new_blkno); 3061 3062 /* 3063 * We need to update the 1st half of the new cluster and 3064 * 1 more for the update of the 1st bucket of the previous 3065 * extent record. 3066 */ 3067 credits = bpc / 2 + 1; 3068 ret = ocfs2_extend_trans(handle, credits); 3069 if (ret) { 3070 mlog_errno(ret); 3071 goto out; 3072 } 3073 3074 ret = ocfs2_journal_access(handle, inode, prev_bh, 3075 OCFS2_JOURNAL_ACCESS_WRITE); 3076 if (ret) { 3077 mlog_errno(ret); 3078 goto out; 3079 } 3080 3081 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) { 3082 old_bh = new_bh = NULL; 3083 new_bh = sb_getblk(inode->i_sb, new_blkno); 3084 if (!new_bh) { 3085 ret = -EIO; 3086 mlog_errno(ret); 3087 goto out; 3088 } 3089 3090 ocfs2_set_new_buffer_uptodate(inode, new_bh); 3091 3092 ret = ocfs2_journal_access(handle, inode, new_bh, 3093 OCFS2_JOURNAL_ACCESS_CREATE); 3094 if (ret < 0) { 3095 mlog_errno(ret); 3096 brelse(new_bh); 3097 goto out; 3098 } 3099 3100 ret = ocfs2_read_block(osb, prev_blkno, 3101 &old_bh, OCFS2_BH_CACHED, inode); 3102 if (ret < 0) { 3103 mlog_errno(ret); 3104 brelse(new_bh); 3105 goto out; 3106 } 3107 3108 memcpy(new_bh->b_data, old_bh->b_data, blocksize); 3109 3110 if (i == 0) { 3111 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data; 3112 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2); 3113 3114 if (first_hash) 3115 *first_hash = le32_to_cpu( 3116 new_xh->xh_entries[0].xe_name_hash); 3117 new_first_bh = new_bh; 3118 get_bh(new_first_bh); 3119 } 3120 3121 ocfs2_journal_dirty(handle, new_bh); 3122 3123 if (*header_bh == old_bh) { 3124 brelse(*header_bh); 3125 *header_bh = new_bh; 3126 get_bh(*header_bh); 3127 3128 brelse(*first_bh); 3129 *first_bh = new_first_bh; 3130 get_bh(*first_bh); 3131 } 3132 brelse(new_bh); 3133 brelse(old_bh); 3134 } 3135 3136 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2)); 3137 3138 ocfs2_journal_dirty(handle, prev_bh); 3139 out: 3140 brelse(prev_bh); 3141 brelse(new_first_bh); 3142 return ret; 3143 } 3144 3145 static int ocfs2_read_xattr_bucket(struct inode *inode, 3146 u64 blkno, 3147 struct buffer_head **bhs, 3148 int new) 3149 { 3150 int ret = 0; 3151 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3152 3153 if (!new) 3154 return ocfs2_read_blocks(OCFS2_SB(inode->i_sb), blkno, 3155 blk_per_bucket, bhs, 3156 OCFS2_BH_CACHED, inode); 3157 3158 for (i = 0; i < blk_per_bucket; i++) { 3159 bhs[i] = sb_getblk(inode->i_sb, blkno + i); 3160 if (bhs[i] == NULL) { 3161 ret = -EIO; 3162 mlog_errno(ret); 3163 break; 3164 } 3165 ocfs2_set_new_buffer_uptodate(inode, bhs[i]); 3166 } 3167 3168 return ret; 3169 } 3170 3171 /* 3172 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk). 3173 * first_hash will record the 1st hash of the new bucket. 3174 */ 3175 static int ocfs2_half_xattr_bucket(struct inode *inode, 3176 handle_t *handle, 3177 u64 blk, 3178 u64 new_blk, 3179 u32 *first_hash, 3180 int new_bucket_head) 3181 { 3182 int ret, i; 3183 u16 count, start, len, name_value_len, xe_len, name_offset; 3184 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3185 struct buffer_head **s_bhs, **t_bhs = NULL; 3186 struct ocfs2_xattr_header *xh; 3187 struct ocfs2_xattr_entry *xe; 3188 int blocksize = inode->i_sb->s_blocksize; 3189 3190 mlog(0, "move half of xattrs from bucket %llu to %llu\n", 3191 blk, new_blk); 3192 3193 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3194 if (!s_bhs) 3195 return -ENOMEM; 3196 3197 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0); 3198 if (ret) { 3199 mlog_errno(ret); 3200 goto out; 3201 } 3202 3203 ret = ocfs2_journal_access(handle, inode, s_bhs[0], 3204 OCFS2_JOURNAL_ACCESS_WRITE); 3205 if (ret) { 3206 mlog_errno(ret); 3207 goto out; 3208 } 3209 3210 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3211 if (!t_bhs) { 3212 ret = -ENOMEM; 3213 goto out; 3214 } 3215 3216 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head); 3217 if (ret) { 3218 mlog_errno(ret); 3219 goto out; 3220 } 3221 3222 for (i = 0; i < blk_per_bucket; i++) { 3223 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3224 OCFS2_JOURNAL_ACCESS_CREATE); 3225 if (ret) { 3226 mlog_errno(ret); 3227 goto out; 3228 } 3229 } 3230 3231 /* copy the whole bucket to the new first. */ 3232 for (i = 0; i < blk_per_bucket; i++) 3233 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3234 3235 /* update the new bucket. */ 3236 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data; 3237 count = le16_to_cpu(xh->xh_count); 3238 start = count / 2; 3239 3240 /* 3241 * Calculate the total name/value len and xh_free_start for 3242 * the old bucket first. 3243 */ 3244 name_offset = OCFS2_XATTR_BUCKET_SIZE; 3245 name_value_len = 0; 3246 for (i = 0; i < start; i++) { 3247 xe = &xh->xh_entries[i]; 3248 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3249 if (ocfs2_xattr_is_local(xe)) 3250 xe_len += 3251 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3252 else 3253 xe_len += OCFS2_XATTR_ROOT_SIZE; 3254 name_value_len += xe_len; 3255 if (le16_to_cpu(xe->xe_name_offset) < name_offset) 3256 name_offset = le16_to_cpu(xe->xe_name_offset); 3257 } 3258 3259 /* 3260 * Now begin the modification to the new bucket. 3261 * 3262 * In the new bucket, We just move the xattr entry to the beginning 3263 * and don't touch the name/value. So there will be some holes in the 3264 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is 3265 * called. 3266 */ 3267 xe = &xh->xh_entries[start]; 3268 len = sizeof(struct ocfs2_xattr_entry) * (count - start); 3269 mlog(0, "mv xattr entry len %d from %d to %d\n", len, 3270 (int)((char *)xe - (char *)xh), 3271 (int)((char *)xh->xh_entries - (char *)xh)); 3272 memmove((char *)xh->xh_entries, (char *)xe, len); 3273 xe = &xh->xh_entries[count - start]; 3274 len = sizeof(struct ocfs2_xattr_entry) * start; 3275 memset((char *)xe, 0, len); 3276 3277 le16_add_cpu(&xh->xh_count, -start); 3278 le16_add_cpu(&xh->xh_name_value_len, -name_value_len); 3279 3280 /* Calculate xh_free_start for the new bucket. */ 3281 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); 3282 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 3283 xe = &xh->xh_entries[i]; 3284 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3285 if (ocfs2_xattr_is_local(xe)) 3286 xe_len += 3287 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3288 else 3289 xe_len += OCFS2_XATTR_ROOT_SIZE; 3290 if (le16_to_cpu(xe->xe_name_offset) < 3291 le16_to_cpu(xh->xh_free_start)) 3292 xh->xh_free_start = xe->xe_name_offset; 3293 } 3294 3295 /* set xh->xh_num_buckets for the new xh. */ 3296 if (new_bucket_head) 3297 xh->xh_num_buckets = cpu_to_le16(1); 3298 else 3299 xh->xh_num_buckets = 0; 3300 3301 for (i = 0; i < blk_per_bucket; i++) { 3302 ocfs2_journal_dirty(handle, t_bhs[i]); 3303 if (ret) 3304 mlog_errno(ret); 3305 } 3306 3307 /* store the first_hash of the new bucket. */ 3308 if (first_hash) 3309 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3310 3311 /* 3312 * Now only update the 1st block of the old bucket. 3313 * Please note that the entry has been sorted already above. 3314 */ 3315 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data; 3316 memset(&xh->xh_entries[start], 0, 3317 sizeof(struct ocfs2_xattr_entry) * (count - start)); 3318 xh->xh_count = cpu_to_le16(start); 3319 xh->xh_free_start = cpu_to_le16(name_offset); 3320 xh->xh_name_value_len = cpu_to_le16(name_value_len); 3321 3322 ocfs2_journal_dirty(handle, s_bhs[0]); 3323 if (ret) 3324 mlog_errno(ret); 3325 3326 out: 3327 if (s_bhs) { 3328 for (i = 0; i < blk_per_bucket; i++) 3329 brelse(s_bhs[i]); 3330 } 3331 kfree(s_bhs); 3332 3333 if (t_bhs) { 3334 for (i = 0; i < blk_per_bucket; i++) 3335 brelse(t_bhs[i]); 3336 } 3337 kfree(t_bhs); 3338 3339 return ret; 3340 } 3341 3342 /* 3343 * Copy xattr from one bucket to another bucket. 3344 * 3345 * The caller must make sure that the journal transaction 3346 * has enough space for journaling. 3347 */ 3348 static int ocfs2_cp_xattr_bucket(struct inode *inode, 3349 handle_t *handle, 3350 u64 s_blkno, 3351 u64 t_blkno, 3352 int t_is_new) 3353 { 3354 int ret, i; 3355 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3356 int blocksize = inode->i_sb->s_blocksize; 3357 struct buffer_head **s_bhs, **t_bhs = NULL; 3358 3359 BUG_ON(s_blkno == t_blkno); 3360 3361 mlog(0, "cp bucket %llu to %llu, target is %d\n", 3362 s_blkno, t_blkno, t_is_new); 3363 3364 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3365 GFP_NOFS); 3366 if (!s_bhs) 3367 return -ENOMEM; 3368 3369 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0); 3370 if (ret) 3371 goto out; 3372 3373 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3374 GFP_NOFS); 3375 if (!t_bhs) { 3376 ret = -ENOMEM; 3377 goto out; 3378 } 3379 3380 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new); 3381 if (ret) 3382 goto out; 3383 3384 for (i = 0; i < blk_per_bucket; i++) { 3385 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3386 OCFS2_JOURNAL_ACCESS_WRITE); 3387 if (ret) 3388 goto out; 3389 } 3390 3391 for (i = 0; i < blk_per_bucket; i++) { 3392 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3393 ocfs2_journal_dirty(handle, t_bhs[i]); 3394 } 3395 3396 out: 3397 if (s_bhs) { 3398 for (i = 0; i < blk_per_bucket; i++) 3399 brelse(s_bhs[i]); 3400 } 3401 kfree(s_bhs); 3402 3403 if (t_bhs) { 3404 for (i = 0; i < blk_per_bucket; i++) 3405 brelse(t_bhs[i]); 3406 } 3407 kfree(t_bhs); 3408 3409 return ret; 3410 } 3411 3412 /* 3413 * Copy one xattr cluster from src_blk to to_blk. 3414 * The to_blk will become the first bucket header of the cluster, so its 3415 * xh_num_buckets will be initialized as the bucket num in the cluster. 3416 */ 3417 static int ocfs2_cp_xattr_cluster(struct inode *inode, 3418 handle_t *handle, 3419 struct buffer_head *first_bh, 3420 u64 src_blk, 3421 u64 to_blk, 3422 u32 *first_hash) 3423 { 3424 int i, ret, credits; 3425 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3426 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3427 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3428 struct buffer_head *bh = NULL; 3429 struct ocfs2_xattr_header *xh; 3430 u64 to_blk_start = to_blk; 3431 3432 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk); 3433 3434 /* 3435 * We need to update the new cluster and 1 more for the update of 3436 * the 1st bucket of the previous extent rec. 3437 */ 3438 credits = bpc + 1; 3439 ret = ocfs2_extend_trans(handle, credits); 3440 if (ret) { 3441 mlog_errno(ret); 3442 goto out; 3443 } 3444 3445 ret = ocfs2_journal_access(handle, inode, first_bh, 3446 OCFS2_JOURNAL_ACCESS_WRITE); 3447 if (ret) { 3448 mlog_errno(ret); 3449 goto out; 3450 } 3451 3452 for (i = 0; i < num_buckets; i++) { 3453 ret = ocfs2_cp_xattr_bucket(inode, handle, 3454 src_blk, to_blk, 1); 3455 if (ret) { 3456 mlog_errno(ret); 3457 goto out; 3458 } 3459 3460 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3461 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3462 } 3463 3464 /* update the old bucket header. */ 3465 xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3466 le16_add_cpu(&xh->xh_num_buckets, -num_buckets); 3467 3468 ocfs2_journal_dirty(handle, first_bh); 3469 3470 /* update the new bucket header. */ 3471 ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode); 3472 if (ret < 0) { 3473 mlog_errno(ret); 3474 goto out; 3475 } 3476 3477 ret = ocfs2_journal_access(handle, inode, bh, 3478 OCFS2_JOURNAL_ACCESS_WRITE); 3479 if (ret) { 3480 mlog_errno(ret); 3481 goto out; 3482 } 3483 3484 xh = (struct ocfs2_xattr_header *)bh->b_data; 3485 xh->xh_num_buckets = cpu_to_le16(num_buckets); 3486 3487 ocfs2_journal_dirty(handle, bh); 3488 3489 if (first_hash) 3490 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3491 out: 3492 brelse(bh); 3493 return ret; 3494 } 3495 3496 /* 3497 * Move half of the xattrs in this cluster to the new cluster. 3498 * This function should only be called when bucket size == cluster size. 3499 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead. 3500 */ 3501 static int ocfs2_half_xattr_cluster(struct inode *inode, 3502 handle_t *handle, 3503 u64 prev_blk, 3504 u64 new_blk, 3505 u32 *first_hash) 3506 { 3507 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3508 int ret, credits = 2 * blk_per_bucket; 3509 3510 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize); 3511 3512 ret = ocfs2_extend_trans(handle, credits); 3513 if (ret) { 3514 mlog_errno(ret); 3515 return ret; 3516 } 3517 3518 /* Move half of the xattr in start_blk to the next bucket. */ 3519 return ocfs2_half_xattr_bucket(inode, handle, prev_blk, 3520 new_blk, first_hash, 1); 3521 } 3522 3523 /* 3524 * Move some xattrs from the old cluster to the new one since they are not 3525 * contiguous in ocfs2 xattr tree. 3526 * 3527 * new_blk starts a new separate cluster, and we will move some xattrs from 3528 * prev_blk to it. v_start will be set as the first name hash value in this 3529 * new cluster so that it can be used as e_cpos during tree insertion and 3530 * don't collide with our original b-tree operations. first_bh and header_bh 3531 * will also be updated since they will be used in ocfs2_extend_xattr_bucket 3532 * to extend the insert bucket. 3533 * 3534 * The problem is how much xattr should we move to the new one and when should 3535 * we update first_bh and header_bh? 3536 * 1. If cluster size > bucket size, that means the previous cluster has more 3537 * than 1 bucket, so just move half nums of bucket into the new cluster and 3538 * update the first_bh and header_bh if the insert bucket has been moved 3539 * to the new cluster. 3540 * 2. If cluster_size == bucket_size: 3541 * a) If the previous extent rec has more than one cluster and the insert 3542 * place isn't in the last cluster, copy the entire last cluster to the 3543 * new one. This time, we don't need to upate the first_bh and header_bh 3544 * since they will not be moved into the new cluster. 3545 * b) Otherwise, move the bottom half of the xattrs in the last cluster into 3546 * the new one. And we set the extend flag to zero if the insert place is 3547 * moved into the new allocated cluster since no extend is needed. 3548 */ 3549 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode, 3550 handle_t *handle, 3551 struct buffer_head **first_bh, 3552 struct buffer_head **header_bh, 3553 u64 new_blk, 3554 u64 prev_blk, 3555 u32 prev_clusters, 3556 u32 *v_start, 3557 int *extend) 3558 { 3559 int ret = 0; 3560 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3561 3562 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n", 3563 prev_blk, prev_clusters, new_blk); 3564 3565 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) 3566 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode, 3567 handle, 3568 first_bh, 3569 header_bh, 3570 new_blk, 3571 prev_blk, 3572 prev_clusters, 3573 v_start); 3574 else { 3575 u64 last_blk = prev_blk + bpc * (prev_clusters - 1); 3576 3577 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk) 3578 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh, 3579 last_blk, new_blk, 3580 v_start); 3581 else { 3582 ret = ocfs2_half_xattr_cluster(inode, handle, 3583 last_blk, new_blk, 3584 v_start); 3585 3586 if ((*header_bh)->b_blocknr == last_blk && extend) 3587 *extend = 0; 3588 } 3589 } 3590 3591 return ret; 3592 } 3593 3594 /* 3595 * Add a new cluster for xattr storage. 3596 * 3597 * If the new cluster is contiguous with the previous one, it will be 3598 * appended to the same extent record, and num_clusters will be updated. 3599 * If not, we will insert a new extent for it and move some xattrs in 3600 * the last cluster into the new allocated one. 3601 * We also need to limit the maximum size of a btree leaf, otherwise we'll 3602 * lose the benefits of hashing because we'll have to search large leaves. 3603 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize, 3604 * if it's bigger). 3605 * 3606 * first_bh is the first block of the previous extent rec and header_bh 3607 * indicates the bucket we will insert the new xattrs. They will be updated 3608 * when the header_bh is moved into the new cluster. 3609 */ 3610 static int ocfs2_add_new_xattr_cluster(struct inode *inode, 3611 struct buffer_head *root_bh, 3612 struct buffer_head **first_bh, 3613 struct buffer_head **header_bh, 3614 u32 *num_clusters, 3615 u32 prev_cpos, 3616 u64 prev_blkno, 3617 int *extend) 3618 { 3619 int ret, credits; 3620 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3621 u32 prev_clusters = *num_clusters; 3622 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0; 3623 u64 block; 3624 handle_t *handle = NULL; 3625 struct ocfs2_alloc_context *data_ac = NULL; 3626 struct ocfs2_alloc_context *meta_ac = NULL; 3627 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3628 struct ocfs2_extent_tree et; 3629 3630 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, " 3631 "previous xattr blkno = %llu\n", 3632 (unsigned long long)OCFS2_I(inode)->ip_blkno, 3633 prev_cpos, prev_blkno); 3634 3635 ocfs2_get_xattr_tree_extent_tree(&et, inode, root_bh); 3636 3637 ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, 3638 &data_ac, &meta_ac); 3639 if (ret) { 3640 mlog_errno(ret); 3641 goto leave; 3642 } 3643 3644 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el, 3645 clusters_to_add); 3646 handle = ocfs2_start_trans(osb, credits); 3647 if (IS_ERR(handle)) { 3648 ret = PTR_ERR(handle); 3649 handle = NULL; 3650 mlog_errno(ret); 3651 goto leave; 3652 } 3653 3654 ret = ocfs2_journal_access(handle, inode, root_bh, 3655 OCFS2_JOURNAL_ACCESS_WRITE); 3656 if (ret < 0) { 3657 mlog_errno(ret); 3658 goto leave; 3659 } 3660 3661 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1, 3662 clusters_to_add, &bit_off, &num_bits); 3663 if (ret < 0) { 3664 if (ret != -ENOSPC) 3665 mlog_errno(ret); 3666 goto leave; 3667 } 3668 3669 BUG_ON(num_bits > clusters_to_add); 3670 3671 block = ocfs2_clusters_to_blocks(osb->sb, bit_off); 3672 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n", 3673 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); 3674 3675 if (prev_blkno + prev_clusters * bpc == block && 3676 (prev_clusters + num_bits) << osb->s_clustersize_bits <= 3677 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) { 3678 /* 3679 * If this cluster is contiguous with the old one and 3680 * adding this new cluster, we don't surpass the limit of 3681 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be 3682 * initialized and used like other buckets in the previous 3683 * cluster. 3684 * So add it as a contiguous one. The caller will handle 3685 * its init process. 3686 */ 3687 v_start = prev_cpos + prev_clusters; 3688 *num_clusters = prev_clusters + num_bits; 3689 mlog(0, "Add contiguous %u clusters to previous extent rec.\n", 3690 num_bits); 3691 } else { 3692 ret = ocfs2_adjust_xattr_cross_cluster(inode, 3693 handle, 3694 first_bh, 3695 header_bh, 3696 block, 3697 prev_blkno, 3698 prev_clusters, 3699 &v_start, 3700 extend); 3701 if (ret) { 3702 mlog_errno(ret); 3703 goto leave; 3704 } 3705 } 3706 3707 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n", 3708 num_bits, block, v_start); 3709 ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block, 3710 num_bits, 0, meta_ac); 3711 if (ret < 0) { 3712 mlog_errno(ret); 3713 goto leave; 3714 } 3715 3716 ret = ocfs2_journal_dirty(handle, root_bh); 3717 if (ret < 0) { 3718 mlog_errno(ret); 3719 goto leave; 3720 } 3721 3722 leave: 3723 if (handle) 3724 ocfs2_commit_trans(osb, handle); 3725 if (data_ac) 3726 ocfs2_free_alloc_context(data_ac); 3727 if (meta_ac) 3728 ocfs2_free_alloc_context(meta_ac); 3729 3730 ocfs2_put_extent_tree(&et); 3731 return ret; 3732 } 3733 3734 /* 3735 * Extend a new xattr bucket and move xattrs to the end one by one until 3736 * We meet with start_bh. Only move half of the xattrs to the bucket after it. 3737 */ 3738 static int ocfs2_extend_xattr_bucket(struct inode *inode, 3739 struct buffer_head *first_bh, 3740 struct buffer_head *start_bh, 3741 u32 num_clusters) 3742 { 3743 int ret, credits; 3744 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3745 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3746 u64 start_blk = start_bh->b_blocknr, end_blk; 3747 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb); 3748 handle_t *handle; 3749 struct ocfs2_xattr_header *first_xh = 3750 (struct ocfs2_xattr_header *)first_bh->b_data; 3751 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets); 3752 3753 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting " 3754 "from %llu, len = %u\n", start_blk, 3755 (unsigned long long)first_bh->b_blocknr, num_clusters); 3756 3757 BUG_ON(bucket >= num_buckets); 3758 3759 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket; 3760 3761 /* 3762 * We will touch all the buckets after the start_bh(include it). 3763 * Add one more bucket and modify the first_bh. 3764 */ 3765 credits = end_blk - start_blk + 2 * blk_per_bucket + 1; 3766 handle = ocfs2_start_trans(osb, credits); 3767 if (IS_ERR(handle)) { 3768 ret = PTR_ERR(handle); 3769 handle = NULL; 3770 mlog_errno(ret); 3771 goto out; 3772 } 3773 3774 ret = ocfs2_journal_access(handle, inode, first_bh, 3775 OCFS2_JOURNAL_ACCESS_WRITE); 3776 if (ret) { 3777 mlog_errno(ret); 3778 goto commit; 3779 } 3780 3781 while (end_blk != start_blk) { 3782 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk, 3783 end_blk + blk_per_bucket, 0); 3784 if (ret) 3785 goto commit; 3786 end_blk -= blk_per_bucket; 3787 } 3788 3789 /* Move half of the xattr in start_blk to the next bucket. */ 3790 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk, 3791 start_blk + blk_per_bucket, NULL, 0); 3792 3793 le16_add_cpu(&first_xh->xh_num_buckets, 1); 3794 ocfs2_journal_dirty(handle, first_bh); 3795 3796 commit: 3797 ocfs2_commit_trans(osb, handle); 3798 out: 3799 return ret; 3800 } 3801 3802 /* 3803 * Add new xattr bucket in an extent record and adjust the buckets accordingly. 3804 * xb_bh is the ocfs2_xattr_block. 3805 * We will move all the buckets starting from header_bh to the next place. As 3806 * for this one, half num of its xattrs will be moved to the next one. 3807 * 3808 * We will allocate a new cluster if current cluster is full and adjust 3809 * header_bh and first_bh if the insert place is moved to the new cluster. 3810 */ 3811 static int ocfs2_add_new_xattr_bucket(struct inode *inode, 3812 struct buffer_head *xb_bh, 3813 struct buffer_head *header_bh) 3814 { 3815 struct ocfs2_xattr_header *first_xh = NULL; 3816 struct buffer_head *first_bh = NULL; 3817 struct ocfs2_xattr_block *xb = 3818 (struct ocfs2_xattr_block *)xb_bh->b_data; 3819 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 3820 struct ocfs2_extent_list *el = &xb_root->xt_list; 3821 struct ocfs2_xattr_header *xh = 3822 (struct ocfs2_xattr_header *)header_bh->b_data; 3823 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3824 struct super_block *sb = inode->i_sb; 3825 struct ocfs2_super *osb = OCFS2_SB(sb); 3826 int ret, num_buckets, extend = 1; 3827 u64 p_blkno; 3828 u32 e_cpos, num_clusters; 3829 3830 mlog(0, "Add new xattr bucket starting form %llu\n", 3831 (unsigned long long)header_bh->b_blocknr); 3832 3833 /* 3834 * Add refrence for header_bh here because it may be 3835 * changed in ocfs2_add_new_xattr_cluster and we need 3836 * to free it in the end. 3837 */ 3838 get_bh(header_bh); 3839 3840 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos, 3841 &num_clusters, el); 3842 if (ret) { 3843 mlog_errno(ret); 3844 goto out; 3845 } 3846 3847 ret = ocfs2_read_block(osb, p_blkno, 3848 &first_bh, OCFS2_BH_CACHED, inode); 3849 if (ret) { 3850 mlog_errno(ret); 3851 goto out; 3852 } 3853 3854 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters; 3855 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3856 3857 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) { 3858 ret = ocfs2_add_new_xattr_cluster(inode, 3859 xb_bh, 3860 &first_bh, 3861 &header_bh, 3862 &num_clusters, 3863 e_cpos, 3864 p_blkno, 3865 &extend); 3866 if (ret) { 3867 mlog_errno(ret); 3868 goto out; 3869 } 3870 } 3871 3872 if (extend) 3873 ret = ocfs2_extend_xattr_bucket(inode, 3874 first_bh, 3875 header_bh, 3876 num_clusters); 3877 if (ret) 3878 mlog_errno(ret); 3879 out: 3880 brelse(first_bh); 3881 brelse(header_bh); 3882 return ret; 3883 } 3884 3885 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode, 3886 struct ocfs2_xattr_bucket *bucket, 3887 int offs) 3888 { 3889 int block_off = offs >> inode->i_sb->s_blocksize_bits; 3890 3891 offs = offs % inode->i_sb->s_blocksize; 3892 return bucket->bhs[block_off]->b_data + offs; 3893 } 3894 3895 /* 3896 * Handle the normal xattr set, including replace, delete and new. 3897 * When the bucket is empty, "is_empty" is set and the caller can 3898 * free this bucket. 3899 * 3900 * Note: "local" indicates the real data's locality. So we can't 3901 * just its bucket locality by its length. 3902 */ 3903 static void ocfs2_xattr_set_entry_normal(struct inode *inode, 3904 struct ocfs2_xattr_info *xi, 3905 struct ocfs2_xattr_search *xs, 3906 u32 name_hash, 3907 int local, 3908 int *is_empty) 3909 { 3910 struct ocfs2_xattr_entry *last, *xe; 3911 int name_len = strlen(xi->name); 3912 struct ocfs2_xattr_header *xh = xs->header; 3913 u16 count = le16_to_cpu(xh->xh_count), start; 3914 size_t blocksize = inode->i_sb->s_blocksize; 3915 char *val; 3916 size_t offs, size, new_size; 3917 3918 last = &xh->xh_entries[count]; 3919 if (!xs->not_found) { 3920 xe = xs->here; 3921 offs = le16_to_cpu(xe->xe_name_offset); 3922 if (ocfs2_xattr_is_local(xe)) 3923 size = OCFS2_XATTR_SIZE(name_len) + 3924 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3925 else 3926 size = OCFS2_XATTR_SIZE(name_len) + 3927 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 3928 3929 /* 3930 * If the new value will be stored outside, xi->value has been 3931 * initalized as an empty ocfs2_xattr_value_root, and the same 3932 * goes with xi->value_len, so we can set new_size safely here. 3933 * See ocfs2_xattr_set_in_bucket. 3934 */ 3935 new_size = OCFS2_XATTR_SIZE(name_len) + 3936 OCFS2_XATTR_SIZE(xi->value_len); 3937 3938 le16_add_cpu(&xh->xh_name_value_len, -size); 3939 if (xi->value) { 3940 if (new_size > size) 3941 goto set_new_name_value; 3942 3943 /* Now replace the old value with new one. */ 3944 if (local) 3945 xe->xe_value_size = cpu_to_le64(xi->value_len); 3946 else 3947 xe->xe_value_size = 0; 3948 3949 val = ocfs2_xattr_bucket_get_val(inode, 3950 &xs->bucket, offs); 3951 memset(val + OCFS2_XATTR_SIZE(name_len), 0, 3952 size - OCFS2_XATTR_SIZE(name_len)); 3953 if (OCFS2_XATTR_SIZE(xi->value_len) > 0) 3954 memcpy(val + OCFS2_XATTR_SIZE(name_len), 3955 xi->value, xi->value_len); 3956 3957 le16_add_cpu(&xh->xh_name_value_len, new_size); 3958 ocfs2_xattr_set_local(xe, local); 3959 return; 3960 } else { 3961 /* Remove the old entry. */ 3962 last -= 1; 3963 memmove(xe, xe + 1, 3964 (void *)last - (void *)xe); 3965 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 3966 le16_add_cpu(&xh->xh_count, -1); 3967 if (xh->xh_count == 0 && is_empty) 3968 *is_empty = 1; 3969 return; 3970 } 3971 } else { 3972 /* find a new entry for insert. */ 3973 int low = 0, high = count - 1, tmp; 3974 struct ocfs2_xattr_entry *tmp_xe; 3975 3976 while (low <= high) { 3977 tmp = (low + high) / 2; 3978 tmp_xe = &xh->xh_entries[tmp]; 3979 3980 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash)) 3981 low = tmp + 1; 3982 else if (name_hash < 3983 le32_to_cpu(tmp_xe->xe_name_hash)) 3984 high = tmp - 1; 3985 else 3986 break; 3987 } 3988 3989 xe = &xh->xh_entries[low]; 3990 if (low != count) 3991 memmove(xe + 1, xe, (void *)last - (void *)xe); 3992 3993 le16_add_cpu(&xh->xh_count, 1); 3994 memset(xe, 0, sizeof(struct ocfs2_xattr_entry)); 3995 xe->xe_name_hash = cpu_to_le32(name_hash); 3996 xe->xe_name_len = name_len; 3997 ocfs2_xattr_set_type(xe, xi->name_index); 3998 } 3999 4000 set_new_name_value: 4001 /* Insert the new name+value. */ 4002 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len); 4003 4004 /* 4005 * We must make sure that the name/value pair 4006 * exists in the same block. 4007 */ 4008 offs = le16_to_cpu(xh->xh_free_start); 4009 start = offs - size; 4010 4011 if (start >> inode->i_sb->s_blocksize_bits != 4012 (offs - 1) >> inode->i_sb->s_blocksize_bits) { 4013 offs = offs - offs % blocksize; 4014 xh->xh_free_start = cpu_to_le16(offs); 4015 } 4016 4017 val = ocfs2_xattr_bucket_get_val(inode, 4018 &xs->bucket, offs - size); 4019 xe->xe_name_offset = cpu_to_le16(offs - size); 4020 4021 memset(val, 0, size); 4022 memcpy(val, xi->name, name_len); 4023 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); 4024 4025 xe->xe_value_size = cpu_to_le64(xi->value_len); 4026 ocfs2_xattr_set_local(xe, local); 4027 xs->here = xe; 4028 le16_add_cpu(&xh->xh_free_start, -size); 4029 le16_add_cpu(&xh->xh_name_value_len, size); 4030 4031 return; 4032 } 4033 4034 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode, 4035 handle_t *handle, 4036 struct ocfs2_xattr_search *xs, 4037 struct buffer_head **bhs, 4038 u16 bh_num) 4039 { 4040 int ret = 0, off, block_off; 4041 struct ocfs2_xattr_entry *xe = xs->here; 4042 4043 /* 4044 * First calculate all the blocks we should journal_access 4045 * and journal_dirty. The first block should always be touched. 4046 */ 4047 ret = ocfs2_journal_dirty(handle, bhs[0]); 4048 if (ret) 4049 mlog_errno(ret); 4050 4051 /* calc the data. */ 4052 off = le16_to_cpu(xe->xe_name_offset); 4053 block_off = off >> inode->i_sb->s_blocksize_bits; 4054 ret = ocfs2_journal_dirty(handle, bhs[block_off]); 4055 if (ret) 4056 mlog_errno(ret); 4057 4058 return ret; 4059 } 4060 4061 /* 4062 * Set the xattr entry in the specified bucket. 4063 * The bucket is indicated by xs->bucket and it should have the enough 4064 * space for the xattr insertion. 4065 */ 4066 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode, 4067 struct ocfs2_xattr_info *xi, 4068 struct ocfs2_xattr_search *xs, 4069 u32 name_hash, 4070 int local, 4071 int *bucket_empty) 4072 { 4073 int i, ret; 4074 handle_t *handle = NULL; 4075 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4076 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4077 4078 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n", 4079 (unsigned long)xi->value_len, xi->name_index, 4080 (unsigned long long)xs->bucket.bhs[0]->b_blocknr); 4081 4082 if (!xs->bucket.bhs[1]) { 4083 ret = ocfs2_read_blocks(osb, 4084 xs->bucket.bhs[0]->b_blocknr + 1, 4085 blk_per_bucket - 1, &xs->bucket.bhs[1], 4086 OCFS2_BH_CACHED, inode); 4087 if (ret) { 4088 mlog_errno(ret); 4089 goto out; 4090 } 4091 } 4092 4093 handle = ocfs2_start_trans(osb, blk_per_bucket); 4094 if (IS_ERR(handle)) { 4095 ret = PTR_ERR(handle); 4096 handle = NULL; 4097 mlog_errno(ret); 4098 goto out; 4099 } 4100 4101 for (i = 0; i < blk_per_bucket; i++) { 4102 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i], 4103 OCFS2_JOURNAL_ACCESS_WRITE); 4104 if (ret < 0) { 4105 mlog_errno(ret); 4106 goto out; 4107 } 4108 } 4109 4110 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, 4111 local, bucket_empty); 4112 4113 /*Only dirty the blocks we have touched in set xattr. */ 4114 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs, 4115 xs->bucket.bhs, blk_per_bucket); 4116 if (ret) 4117 mlog_errno(ret); 4118 out: 4119 ocfs2_commit_trans(osb, handle); 4120 4121 return ret; 4122 } 4123 4124 static int ocfs2_xattr_value_update_size(struct inode *inode, 4125 struct buffer_head *xe_bh, 4126 struct ocfs2_xattr_entry *xe, 4127 u64 new_size) 4128 { 4129 int ret; 4130 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4131 handle_t *handle = NULL; 4132 4133 handle = ocfs2_start_trans(osb, 1); 4134 if (handle == NULL) { 4135 ret = -ENOMEM; 4136 mlog_errno(ret); 4137 goto out; 4138 } 4139 4140 ret = ocfs2_journal_access(handle, inode, xe_bh, 4141 OCFS2_JOURNAL_ACCESS_WRITE); 4142 if (ret < 0) { 4143 mlog_errno(ret); 4144 goto out_commit; 4145 } 4146 4147 xe->xe_value_size = cpu_to_le64(new_size); 4148 4149 ret = ocfs2_journal_dirty(handle, xe_bh); 4150 if (ret < 0) 4151 mlog_errno(ret); 4152 4153 out_commit: 4154 ocfs2_commit_trans(osb, handle); 4155 out: 4156 return ret; 4157 } 4158 4159 /* 4160 * Truncate the specified xe_off entry in xattr bucket. 4161 * bucket is indicated by header_bh and len is the new length. 4162 * Both the ocfs2_xattr_value_root and the entry will be updated here. 4163 * 4164 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed. 4165 */ 4166 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode, 4167 struct buffer_head *header_bh, 4168 int xe_off, 4169 int len) 4170 { 4171 int ret, offset; 4172 u64 value_blk; 4173 struct buffer_head *value_bh = NULL; 4174 struct ocfs2_xattr_value_root *xv; 4175 struct ocfs2_xattr_entry *xe; 4176 struct ocfs2_xattr_header *xh = 4177 (struct ocfs2_xattr_header *)header_bh->b_data; 4178 size_t blocksize = inode->i_sb->s_blocksize; 4179 4180 xe = &xh->xh_entries[xe_off]; 4181 4182 BUG_ON(!xe || ocfs2_xattr_is_local(xe)); 4183 4184 offset = le16_to_cpu(xe->xe_name_offset) + 4185 OCFS2_XATTR_SIZE(xe->xe_name_len); 4186 4187 value_blk = offset / blocksize; 4188 4189 /* We don't allow ocfs2_xattr_value to be stored in different block. */ 4190 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize); 4191 value_blk += header_bh->b_blocknr; 4192 4193 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk, 4194 &value_bh, OCFS2_BH_CACHED, inode); 4195 if (ret) { 4196 mlog_errno(ret); 4197 goto out; 4198 } 4199 4200 xv = (struct ocfs2_xattr_value_root *) 4201 (value_bh->b_data + offset % blocksize); 4202 4203 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n", 4204 xe_off, (unsigned long long)header_bh->b_blocknr, len); 4205 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len); 4206 if (ret) { 4207 mlog_errno(ret); 4208 goto out; 4209 } 4210 4211 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len); 4212 if (ret) { 4213 mlog_errno(ret); 4214 goto out; 4215 } 4216 4217 out: 4218 brelse(value_bh); 4219 return ret; 4220 } 4221 4222 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode, 4223 struct ocfs2_xattr_search *xs, 4224 int len) 4225 { 4226 int ret, offset; 4227 struct ocfs2_xattr_entry *xe = xs->here; 4228 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base; 4229 4230 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe)); 4231 4232 offset = xe - xh->xh_entries; 4233 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0], 4234 offset, len); 4235 if (ret) 4236 mlog_errno(ret); 4237 4238 return ret; 4239 } 4240 4241 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode, 4242 struct ocfs2_xattr_search *xs, 4243 char *val, 4244 int value_len) 4245 { 4246 int offset; 4247 struct ocfs2_xattr_value_root *xv; 4248 struct ocfs2_xattr_entry *xe = xs->here; 4249 4250 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe)); 4251 4252 offset = le16_to_cpu(xe->xe_name_offset) + 4253 OCFS2_XATTR_SIZE(xe->xe_name_len); 4254 4255 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset); 4256 4257 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len); 4258 } 4259 4260 /* 4261 * Remove the xattr bucket pointed by bucket_bh. 4262 * All the buckets after it in the same xattr extent rec will be 4263 * move forward one by one. 4264 */ 4265 static int ocfs2_rm_xattr_bucket(struct inode *inode, 4266 struct buffer_head *first_bh, 4267 struct ocfs2_xattr_bucket *bucket) 4268 { 4269 int ret = 0, credits; 4270 struct ocfs2_xattr_header *xh = 4271 (struct ocfs2_xattr_header *)first_bh->b_data; 4272 u16 bucket_num = le16_to_cpu(xh->xh_num_buckets); 4273 u64 end, start = bucket->bhs[0]->b_blocknr; 4274 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4275 handle_t *handle; 4276 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4277 4278 end = first_bh->b_blocknr + (bucket_num - 1) * blk_per_bucket; 4279 4280 mlog(0, "rm xattr bucket %llu\n", start); 4281 /* 4282 * We need to update the first xattr_header and all the buckets starting 4283 * from start in this xattr rec. 4284 * 4285 * XXX: Should we empty the old last bucket here? 4286 */ 4287 credits = 1 + end - start; 4288 handle = ocfs2_start_trans(osb, credits); 4289 if (IS_ERR(handle)) { 4290 ret = PTR_ERR(handle); 4291 mlog_errno(ret); 4292 return ret; 4293 } 4294 4295 ret = ocfs2_journal_access(handle, inode, first_bh, 4296 OCFS2_JOURNAL_ACCESS_WRITE); 4297 if (ret) { 4298 mlog_errno(ret); 4299 goto out_commit; 4300 } 4301 4302 4303 while (start < end) { 4304 ret = ocfs2_cp_xattr_bucket(inode, handle, 4305 start + blk_per_bucket, 4306 start, 0); 4307 if (ret) { 4308 mlog_errno(ret); 4309 goto out_commit; 4310 } 4311 start += blk_per_bucket; 4312 } 4313 4314 /* update the first_bh. */ 4315 xh->xh_num_buckets = cpu_to_le16(bucket_num - 1); 4316 ocfs2_journal_dirty(handle, first_bh); 4317 4318 out_commit: 4319 ocfs2_commit_trans(osb, handle); 4320 return ret; 4321 } 4322 4323 static int ocfs2_rm_xattr_cluster(struct inode *inode, 4324 struct buffer_head *root_bh, 4325 u64 blkno, 4326 u32 cpos, 4327 u32 len) 4328 { 4329 int ret; 4330 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4331 struct inode *tl_inode = osb->osb_tl_inode; 4332 handle_t *handle; 4333 struct ocfs2_xattr_block *xb = 4334 (struct ocfs2_xattr_block *)root_bh->b_data; 4335 struct ocfs2_alloc_context *meta_ac = NULL; 4336 struct ocfs2_cached_dealloc_ctxt dealloc; 4337 struct ocfs2_extent_tree et; 4338 4339 ocfs2_get_xattr_tree_extent_tree(&et, inode, root_bh); 4340 4341 ocfs2_init_dealloc_ctxt(&dealloc); 4342 4343 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n", 4344 cpos, len, (unsigned long long)blkno); 4345 4346 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len); 4347 4348 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac); 4349 if (ret) { 4350 ocfs2_put_extent_tree(&et); 4351 mlog_errno(ret); 4352 return ret; 4353 } 4354 4355 mutex_lock(&tl_inode->i_mutex); 4356 4357 if (ocfs2_truncate_log_needs_flush(osb)) { 4358 ret = __ocfs2_flush_truncate_log(osb); 4359 if (ret < 0) { 4360 mlog_errno(ret); 4361 goto out; 4362 } 4363 } 4364 4365 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 4366 if (handle == NULL) { 4367 ret = -ENOMEM; 4368 mlog_errno(ret); 4369 goto out; 4370 } 4371 4372 ret = ocfs2_journal_access(handle, inode, root_bh, 4373 OCFS2_JOURNAL_ACCESS_WRITE); 4374 if (ret) { 4375 mlog_errno(ret); 4376 goto out_commit; 4377 } 4378 4379 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac, 4380 &dealloc); 4381 if (ret) { 4382 mlog_errno(ret); 4383 goto out_commit; 4384 } 4385 4386 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len); 4387 4388 ret = ocfs2_journal_dirty(handle, root_bh); 4389 if (ret) { 4390 mlog_errno(ret); 4391 goto out_commit; 4392 } 4393 4394 ret = ocfs2_truncate_log_append(osb, handle, blkno, len); 4395 if (ret) 4396 mlog_errno(ret); 4397 4398 out_commit: 4399 ocfs2_commit_trans(osb, handle); 4400 out: 4401 ocfs2_schedule_truncate_log_flush(osb, 1); 4402 4403 mutex_unlock(&tl_inode->i_mutex); 4404 4405 if (meta_ac) 4406 ocfs2_free_alloc_context(meta_ac); 4407 4408 ocfs2_run_deallocs(osb, &dealloc); 4409 4410 ocfs2_put_extent_tree(&et); 4411 return ret; 4412 } 4413 4414 /* 4415 * Free the xattr bucket indicated by xs->bucket and if all the buckets 4416 * in the clusters is free, free the clusters also. 4417 */ 4418 static int ocfs2_xattr_bucket_shrink(struct inode *inode, 4419 struct ocfs2_xattr_info *xi, 4420 struct ocfs2_xattr_search *xs, 4421 u32 name_hash) 4422 { 4423 int ret; 4424 u32 e_cpos, num_clusters; 4425 u64 p_blkno; 4426 struct buffer_head *first_bh = NULL; 4427 struct ocfs2_xattr_header *first_xh; 4428 struct ocfs2_xattr_block *xb = 4429 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 4430 4431 BUG_ON(xs->header->xh_count != 0); 4432 4433 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4434 &e_cpos, &num_clusters, 4435 &xb->xb_attrs.xb_root.xt_list); 4436 if (ret) { 4437 mlog_errno(ret); 4438 return ret; 4439 } 4440 4441 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, 4442 &first_bh, OCFS2_BH_CACHED, inode); 4443 if (ret) { 4444 mlog_errno(ret); 4445 return ret; 4446 } 4447 4448 ret = ocfs2_rm_xattr_bucket(inode, first_bh, &xs->bucket); 4449 if (ret) { 4450 mlog_errno(ret); 4451 goto out; 4452 } 4453 4454 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 4455 if (first_xh->xh_num_buckets == 0) 4456 ret = ocfs2_rm_xattr_cluster(inode, xs->xattr_bh, 4457 p_blkno, e_cpos, 4458 num_clusters); 4459 4460 out: 4461 brelse(first_bh); 4462 return ret; 4463 } 4464 4465 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode, 4466 struct ocfs2_xattr_search *xs) 4467 { 4468 handle_t *handle = NULL; 4469 struct ocfs2_xattr_header *xh = xs->bucket.xh; 4470 struct ocfs2_xattr_entry *last = &xh->xh_entries[ 4471 le16_to_cpu(xh->xh_count) - 1]; 4472 int ret = 0; 4473 4474 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1); 4475 if (IS_ERR(handle)) { 4476 ret = PTR_ERR(handle); 4477 mlog_errno(ret); 4478 return; 4479 } 4480 4481 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0], 4482 OCFS2_JOURNAL_ACCESS_WRITE); 4483 if (ret) { 4484 mlog_errno(ret); 4485 goto out_commit; 4486 } 4487 4488 /* Remove the old entry. */ 4489 memmove(xs->here, xs->here + 1, 4490 (void *)last - (void *)xs->here); 4491 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 4492 le16_add_cpu(&xh->xh_count, -1); 4493 4494 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]); 4495 if (ret < 0) 4496 mlog_errno(ret); 4497 out_commit: 4498 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 4499 } 4500 4501 /* 4502 * Set the xattr name/value in the bucket specified in xs. 4503 * 4504 * As the new value in xi may be stored in the bucket or in an outside cluster, 4505 * we divide the whole process into 3 steps: 4506 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket) 4507 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs) 4508 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside) 4509 * 4. If the clusters for the new outside value can't be allocated, we need 4510 * to free the xattr we allocated in set. 4511 */ 4512 static int ocfs2_xattr_set_in_bucket(struct inode *inode, 4513 struct ocfs2_xattr_info *xi, 4514 struct ocfs2_xattr_search *xs) 4515 { 4516 int ret, local = 1, bucket_empty = 0; 4517 size_t value_len; 4518 char *val = (char *)xi->value; 4519 struct ocfs2_xattr_entry *xe = xs->here; 4520 u32 name_hash = ocfs2_xattr_hash_by_name(inode, 4521 xi->name_index, xi->name); 4522 4523 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) { 4524 /* 4525 * We need to truncate the xattr storage first. 4526 * 4527 * If both the old and new value are stored to 4528 * outside block, we only need to truncate 4529 * the storage and then set the value outside. 4530 * 4531 * If the new value should be stored within block, 4532 * we should free all the outside block first and 4533 * the modification to the xattr block will be done 4534 * by following steps. 4535 */ 4536 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4537 value_len = xi->value_len; 4538 else 4539 value_len = 0; 4540 4541 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4542 value_len); 4543 if (ret) 4544 goto out; 4545 4546 if (value_len) 4547 goto set_value_outside; 4548 } 4549 4550 value_len = xi->value_len; 4551 /* So we have to handle the inside block change now. */ 4552 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4553 /* 4554 * If the new value will be stored outside of block, 4555 * initalize a new empty value root and insert it first. 4556 */ 4557 local = 0; 4558 xi->value = &def_xv; 4559 xi->value_len = OCFS2_XATTR_ROOT_SIZE; 4560 } 4561 4562 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, 4563 local, &bucket_empty); 4564 if (ret) { 4565 mlog_errno(ret); 4566 goto out; 4567 } 4568 4569 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4570 /* allocate the space now for the outside block storage. */ 4571 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4572 value_len); 4573 if (ret) { 4574 mlog_errno(ret); 4575 4576 if (xs->not_found) { 4577 /* 4578 * We can't allocate enough clusters for outside 4579 * storage and we have allocated xattr already, 4580 * so need to remove it. 4581 */ 4582 ocfs2_xattr_bucket_remove_xs(inode, xs); 4583 } 4584 goto out; 4585 } 4586 } else { 4587 if (bucket_empty) 4588 ret = ocfs2_xattr_bucket_shrink(inode, xi, 4589 xs, name_hash); 4590 goto out; 4591 } 4592 4593 set_value_outside: 4594 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len); 4595 out: 4596 return ret; 4597 } 4598 4599 /* check whether the xattr bucket is filled up with the same hash value. */ 4600 static int ocfs2_check_xattr_bucket_collision(struct inode *inode, 4601 struct ocfs2_xattr_bucket *bucket) 4602 { 4603 struct ocfs2_xattr_header *xh = bucket->xh; 4604 4605 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash == 4606 xh->xh_entries[0].xe_name_hash) { 4607 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, " 4608 "hash = %u\n", 4609 (unsigned long long)bucket->bhs[0]->b_blocknr, 4610 le32_to_cpu(xh->xh_entries[0].xe_name_hash)); 4611 return -ENOSPC; 4612 } 4613 4614 return 0; 4615 } 4616 4617 static int ocfs2_xattr_set_entry_index_block(struct inode *inode, 4618 struct ocfs2_xattr_info *xi, 4619 struct ocfs2_xattr_search *xs) 4620 { 4621 struct ocfs2_xattr_header *xh; 4622 struct ocfs2_xattr_entry *xe; 4623 u16 count, header_size, xh_free_start; 4624 int i, free, max_free, need, old; 4625 size_t value_size = 0, name_len = strlen(xi->name); 4626 size_t blocksize = inode->i_sb->s_blocksize; 4627 int ret, allocation = 0; 4628 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4629 4630 mlog_entry("Set xattr %s in xattr index block\n", xi->name); 4631 4632 try_again: 4633 xh = xs->header; 4634 count = le16_to_cpu(xh->xh_count); 4635 xh_free_start = le16_to_cpu(xh->xh_free_start); 4636 header_size = sizeof(struct ocfs2_xattr_header) + 4637 count * sizeof(struct ocfs2_xattr_entry); 4638 max_free = OCFS2_XATTR_BUCKET_SIZE - 4639 le16_to_cpu(xh->xh_name_value_len) - header_size; 4640 4641 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size " 4642 "of %u which exceed block size\n", 4643 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4644 header_size); 4645 4646 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4647 value_size = OCFS2_XATTR_ROOT_SIZE; 4648 else if (xi->value) 4649 value_size = OCFS2_XATTR_SIZE(xi->value_len); 4650 4651 if (xs->not_found) 4652 need = sizeof(struct ocfs2_xattr_entry) + 4653 OCFS2_XATTR_SIZE(name_len) + value_size; 4654 else { 4655 need = value_size + OCFS2_XATTR_SIZE(name_len); 4656 4657 /* 4658 * We only replace the old value if the new length is smaller 4659 * than the old one. Otherwise we will allocate new space in the 4660 * bucket to store it. 4661 */ 4662 xe = xs->here; 4663 if (ocfs2_xattr_is_local(xe)) 4664 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 4665 else 4666 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 4667 4668 if (old >= value_size) 4669 need = 0; 4670 } 4671 4672 free = xh_free_start - header_size; 4673 /* 4674 * We need to make sure the new name/value pair 4675 * can exist in the same block. 4676 */ 4677 if (xh_free_start % blocksize < need) 4678 free -= xh_free_start % blocksize; 4679 4680 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, " 4681 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len =" 4682 " %u\n", xs->not_found, 4683 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4684 free, need, max_free, le16_to_cpu(xh->xh_free_start), 4685 le16_to_cpu(xh->xh_name_value_len)); 4686 4687 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4688 if (need <= max_free && 4689 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4690 /* 4691 * We can create the space by defragment. Since only the 4692 * name/value will be moved, the xe shouldn't be changed 4693 * in xs. 4694 */ 4695 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket); 4696 if (ret) { 4697 mlog_errno(ret); 4698 goto out; 4699 } 4700 4701 xh_free_start = le16_to_cpu(xh->xh_free_start); 4702 free = xh_free_start - header_size; 4703 if (xh_free_start % blocksize < need) 4704 free -= xh_free_start % blocksize; 4705 4706 if (free >= need) 4707 goto xattr_set; 4708 4709 mlog(0, "Can't get enough space for xattr insert by " 4710 "defragment. Need %u bytes, but we have %d, so " 4711 "allocate new bucket for it.\n", need, free); 4712 } 4713 4714 /* 4715 * We have to add new buckets or clusters and one 4716 * allocation should leave us enough space for insert. 4717 */ 4718 BUG_ON(allocation); 4719 4720 /* 4721 * We do not allow for overlapping ranges between buckets. And 4722 * the maximum number of collisions we will allow for then is 4723 * one bucket's worth, so check it here whether we need to 4724 * add a new bucket for the insert. 4725 */ 4726 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket); 4727 if (ret) { 4728 mlog_errno(ret); 4729 goto out; 4730 } 4731 4732 ret = ocfs2_add_new_xattr_bucket(inode, 4733 xs->xattr_bh, 4734 xs->bucket.bhs[0]); 4735 if (ret) { 4736 mlog_errno(ret); 4737 goto out; 4738 } 4739 4740 for (i = 0; i < blk_per_bucket; i++) 4741 brelse(xs->bucket.bhs[i]); 4742 4743 memset(&xs->bucket, 0, sizeof(xs->bucket)); 4744 4745 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh, 4746 xi->name_index, 4747 xi->name, xs); 4748 if (ret && ret != -ENODATA) 4749 goto out; 4750 xs->not_found = ret; 4751 allocation = 1; 4752 goto try_again; 4753 } 4754 4755 xattr_set: 4756 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs); 4757 out: 4758 mlog_exit(ret); 4759 return ret; 4760 } 4761 4762 static int ocfs2_delete_xattr_in_bucket(struct inode *inode, 4763 struct ocfs2_xattr_bucket *bucket, 4764 void *para) 4765 { 4766 int ret = 0; 4767 struct ocfs2_xattr_header *xh = bucket->xh; 4768 u16 i; 4769 struct ocfs2_xattr_entry *xe; 4770 4771 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 4772 xe = &xh->xh_entries[i]; 4773 if (ocfs2_xattr_is_local(xe)) 4774 continue; 4775 4776 ret = ocfs2_xattr_bucket_value_truncate(inode, 4777 bucket->bhs[0], 4778 i, 0); 4779 if (ret) { 4780 mlog_errno(ret); 4781 break; 4782 } 4783 } 4784 4785 return ret; 4786 } 4787 4788 static int ocfs2_delete_xattr_index_block(struct inode *inode, 4789 struct buffer_head *xb_bh) 4790 { 4791 struct ocfs2_xattr_block *xb = 4792 (struct ocfs2_xattr_block *)xb_bh->b_data; 4793 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 4794 int ret = 0; 4795 u32 name_hash = UINT_MAX, e_cpos, num_clusters; 4796 u64 p_blkno; 4797 4798 if (le16_to_cpu(el->l_next_free_rec) == 0) 4799 return 0; 4800 4801 while (name_hash > 0) { 4802 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4803 &e_cpos, &num_clusters, el); 4804 if (ret) { 4805 mlog_errno(ret); 4806 goto out; 4807 } 4808 4809 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 4810 ocfs2_delete_xattr_in_bucket, 4811 NULL); 4812 if (ret) { 4813 mlog_errno(ret); 4814 goto out; 4815 } 4816 4817 ret = ocfs2_rm_xattr_cluster(inode, xb_bh, 4818 p_blkno, e_cpos, num_clusters); 4819 if (ret) { 4820 mlog_errno(ret); 4821 break; 4822 } 4823 4824 if (e_cpos == 0) 4825 break; 4826 4827 name_hash = e_cpos - 1; 4828 } 4829 4830 out: 4831 return ret; 4832 } 4833