1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * xattr.c 5 * 6 * Copyright (C) 2004, 2008 Oracle. All rights reserved. 7 * 8 * CREDITS: 9 * Lots of code in this file is copy from linux/fs/ext3/xattr.c. 10 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public 14 * License version 2 as published by the Free Software Foundation. 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 22 #include <linux/capability.h> 23 #include <linux/fs.h> 24 #include <linux/types.h> 25 #include <linux/slab.h> 26 #include <linux/highmem.h> 27 #include <linux/pagemap.h> 28 #include <linux/uio.h> 29 #include <linux/sched.h> 30 #include <linux/splice.h> 31 #include <linux/mount.h> 32 #include <linux/writeback.h> 33 #include <linux/falloc.h> 34 #include <linux/sort.h> 35 #include <linux/init.h> 36 #include <linux/module.h> 37 #include <linux/string.h> 38 39 #define MLOG_MASK_PREFIX ML_XATTR 40 #include <cluster/masklog.h> 41 42 #include "ocfs2.h" 43 #include "alloc.h" 44 #include "dlmglue.h" 45 #include "file.h" 46 #include "symlink.h" 47 #include "sysfile.h" 48 #include "inode.h" 49 #include "journal.h" 50 #include "ocfs2_fs.h" 51 #include "suballoc.h" 52 #include "uptodate.h" 53 #include "buffer_head_io.h" 54 #include "super.h" 55 #include "xattr.h" 56 57 58 struct ocfs2_xattr_def_value_root { 59 struct ocfs2_xattr_value_root xv; 60 struct ocfs2_extent_rec er; 61 }; 62 63 struct ocfs2_xattr_bucket { 64 struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET]; 65 struct ocfs2_xattr_header *xh; 66 }; 67 68 #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root)) 69 #define OCFS2_XATTR_INLINE_SIZE 80 70 71 static struct ocfs2_xattr_def_value_root def_xv = { 72 .xv.xr_list.l_count = cpu_to_le16(1), 73 }; 74 75 struct xattr_handler *ocfs2_xattr_handlers[] = { 76 &ocfs2_xattr_user_handler, 77 &ocfs2_xattr_trusted_handler, 78 NULL 79 }; 80 81 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = { 82 [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler, 83 [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler, 84 }; 85 86 struct ocfs2_xattr_info { 87 int name_index; 88 const char *name; 89 const void *value; 90 size_t value_len; 91 }; 92 93 struct ocfs2_xattr_search { 94 struct buffer_head *inode_bh; 95 /* 96 * xattr_bh point to the block buffer head which has extended attribute 97 * when extended attribute in inode, xattr_bh is equal to inode_bh. 98 */ 99 struct buffer_head *xattr_bh; 100 struct ocfs2_xattr_header *header; 101 struct ocfs2_xattr_bucket bucket; 102 void *base; 103 void *end; 104 struct ocfs2_xattr_entry *here; 105 int not_found; 106 }; 107 108 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, 109 struct ocfs2_xattr_header *xh, 110 int index, 111 int *block_off, 112 int *new_offset); 113 114 static int ocfs2_xattr_index_block_find(struct inode *inode, 115 struct buffer_head *root_bh, 116 int name_index, 117 const char *name, 118 struct ocfs2_xattr_search *xs); 119 120 static int ocfs2_xattr_tree_list_index_block(struct inode *inode, 121 struct ocfs2_xattr_tree_root *xt, 122 char *buffer, 123 size_t buffer_size); 124 125 static int ocfs2_xattr_create_index_block(struct inode *inode, 126 struct ocfs2_xattr_search *xs); 127 128 static int ocfs2_xattr_set_entry_index_block(struct inode *inode, 129 struct ocfs2_xattr_info *xi, 130 struct ocfs2_xattr_search *xs); 131 132 static int ocfs2_delete_xattr_index_block(struct inode *inode, 133 struct buffer_head *xb_bh); 134 135 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb) 136 { 137 return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE; 138 } 139 140 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb) 141 { 142 return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits); 143 } 144 145 static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb) 146 { 147 u16 len = sb->s_blocksize - 148 offsetof(struct ocfs2_xattr_header, xh_entries); 149 150 return len / sizeof(struct ocfs2_xattr_entry); 151 } 152 153 static inline const char *ocfs2_xattr_prefix(int name_index) 154 { 155 struct xattr_handler *handler = NULL; 156 157 if (name_index > 0 && name_index < OCFS2_XATTR_MAX) 158 handler = ocfs2_xattr_handler_map[name_index]; 159 160 return handler ? handler->prefix : NULL; 161 } 162 163 static u32 ocfs2_xattr_name_hash(struct inode *inode, 164 const char *name, 165 int name_len) 166 { 167 /* Get hash value of uuid from super block */ 168 u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash; 169 int i; 170 171 /* hash extended attribute name */ 172 for (i = 0; i < name_len; i++) { 173 hash = (hash << OCFS2_HASH_SHIFT) ^ 174 (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^ 175 *name++; 176 } 177 178 return hash; 179 } 180 181 /* 182 * ocfs2_xattr_hash_entry() 183 * 184 * Compute the hash of an extended attribute. 185 */ 186 static void ocfs2_xattr_hash_entry(struct inode *inode, 187 struct ocfs2_xattr_header *header, 188 struct ocfs2_xattr_entry *entry) 189 { 190 u32 hash = 0; 191 char *name = (char *)header + le16_to_cpu(entry->xe_name_offset); 192 193 hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len); 194 entry->xe_name_hash = cpu_to_le32(hash); 195 196 return; 197 } 198 199 static int ocfs2_xattr_extend_allocation(struct inode *inode, 200 u32 clusters_to_add, 201 struct buffer_head *xattr_bh, 202 struct ocfs2_xattr_value_root *xv) 203 { 204 int status = 0; 205 int restart_func = 0; 206 int credits = 0; 207 handle_t *handle = NULL; 208 struct ocfs2_alloc_context *data_ac = NULL; 209 struct ocfs2_alloc_context *meta_ac = NULL; 210 enum ocfs2_alloc_restarted why; 211 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 212 u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters); 213 struct ocfs2_extent_tree et; 214 215 mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add); 216 217 ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv); 218 219 restart_all: 220 221 status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, 222 &data_ac, &meta_ac); 223 if (status) { 224 mlog_errno(status); 225 goto leave; 226 } 227 228 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el, 229 clusters_to_add); 230 handle = ocfs2_start_trans(osb, credits); 231 if (IS_ERR(handle)) { 232 status = PTR_ERR(handle); 233 handle = NULL; 234 mlog_errno(status); 235 goto leave; 236 } 237 238 restarted_transaction: 239 status = ocfs2_journal_access(handle, inode, xattr_bh, 240 OCFS2_JOURNAL_ACCESS_WRITE); 241 if (status < 0) { 242 mlog_errno(status); 243 goto leave; 244 } 245 246 prev_clusters = le32_to_cpu(xv->xr_clusters); 247 status = ocfs2_add_clusters_in_btree(osb, 248 inode, 249 &logical_start, 250 clusters_to_add, 251 0, 252 &et, 253 handle, 254 data_ac, 255 meta_ac, 256 &why); 257 if ((status < 0) && (status != -EAGAIN)) { 258 if (status != -ENOSPC) 259 mlog_errno(status); 260 goto leave; 261 } 262 263 status = ocfs2_journal_dirty(handle, xattr_bh); 264 if (status < 0) { 265 mlog_errno(status); 266 goto leave; 267 } 268 269 clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters; 270 271 if (why != RESTART_NONE && clusters_to_add) { 272 if (why == RESTART_META) { 273 mlog(0, "restarting function.\n"); 274 restart_func = 1; 275 } else { 276 BUG_ON(why != RESTART_TRANS); 277 278 mlog(0, "restarting transaction.\n"); 279 /* TODO: This can be more intelligent. */ 280 credits = ocfs2_calc_extend_credits(osb->sb, 281 et.et_root_el, 282 clusters_to_add); 283 status = ocfs2_extend_trans(handle, credits); 284 if (status < 0) { 285 /* handle still has to be committed at 286 * this point. */ 287 status = -ENOMEM; 288 mlog_errno(status); 289 goto leave; 290 } 291 goto restarted_transaction; 292 } 293 } 294 295 leave: 296 if (handle) { 297 ocfs2_commit_trans(osb, handle); 298 handle = NULL; 299 } 300 if (data_ac) { 301 ocfs2_free_alloc_context(data_ac); 302 data_ac = NULL; 303 } 304 if (meta_ac) { 305 ocfs2_free_alloc_context(meta_ac); 306 meta_ac = NULL; 307 } 308 if ((!status) && restart_func) { 309 restart_func = 0; 310 goto restart_all; 311 } 312 313 return status; 314 } 315 316 static int __ocfs2_remove_xattr_range(struct inode *inode, 317 struct buffer_head *root_bh, 318 struct ocfs2_xattr_value_root *xv, 319 u32 cpos, u32 phys_cpos, u32 len, 320 struct ocfs2_cached_dealloc_ctxt *dealloc) 321 { 322 int ret; 323 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); 324 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 325 struct inode *tl_inode = osb->osb_tl_inode; 326 handle_t *handle; 327 struct ocfs2_alloc_context *meta_ac = NULL; 328 struct ocfs2_extent_tree et; 329 330 ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv); 331 332 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac); 333 if (ret) { 334 mlog_errno(ret); 335 return ret; 336 } 337 338 mutex_lock(&tl_inode->i_mutex); 339 340 if (ocfs2_truncate_log_needs_flush(osb)) { 341 ret = __ocfs2_flush_truncate_log(osb); 342 if (ret < 0) { 343 mlog_errno(ret); 344 goto out; 345 } 346 } 347 348 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 349 if (IS_ERR(handle)) { 350 ret = PTR_ERR(handle); 351 mlog_errno(ret); 352 goto out; 353 } 354 355 ret = ocfs2_journal_access(handle, inode, root_bh, 356 OCFS2_JOURNAL_ACCESS_WRITE); 357 if (ret) { 358 mlog_errno(ret); 359 goto out_commit; 360 } 361 362 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac, 363 dealloc); 364 if (ret) { 365 mlog_errno(ret); 366 goto out_commit; 367 } 368 369 le32_add_cpu(&xv->xr_clusters, -len); 370 371 ret = ocfs2_journal_dirty(handle, root_bh); 372 if (ret) { 373 mlog_errno(ret); 374 goto out_commit; 375 } 376 377 ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len); 378 if (ret) 379 mlog_errno(ret); 380 381 out_commit: 382 ocfs2_commit_trans(osb, handle); 383 out: 384 mutex_unlock(&tl_inode->i_mutex); 385 386 if (meta_ac) 387 ocfs2_free_alloc_context(meta_ac); 388 389 return ret; 390 } 391 392 static int ocfs2_xattr_shrink_size(struct inode *inode, 393 u32 old_clusters, 394 u32 new_clusters, 395 struct buffer_head *root_bh, 396 struct ocfs2_xattr_value_root *xv) 397 { 398 int ret = 0; 399 u32 trunc_len, cpos, phys_cpos, alloc_size; 400 u64 block; 401 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 402 struct ocfs2_cached_dealloc_ctxt dealloc; 403 404 ocfs2_init_dealloc_ctxt(&dealloc); 405 406 if (old_clusters <= new_clusters) 407 return 0; 408 409 cpos = new_clusters; 410 trunc_len = old_clusters - new_clusters; 411 while (trunc_len) { 412 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos, 413 &alloc_size, &xv->xr_list); 414 if (ret) { 415 mlog_errno(ret); 416 goto out; 417 } 418 419 if (alloc_size > trunc_len) 420 alloc_size = trunc_len; 421 422 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos, 423 phys_cpos, alloc_size, 424 &dealloc); 425 if (ret) { 426 mlog_errno(ret); 427 goto out; 428 } 429 430 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); 431 ocfs2_remove_xattr_clusters_from_cache(inode, block, 432 alloc_size); 433 cpos += alloc_size; 434 trunc_len -= alloc_size; 435 } 436 437 out: 438 ocfs2_schedule_truncate_log_flush(osb, 1); 439 ocfs2_run_deallocs(osb, &dealloc); 440 441 return ret; 442 } 443 444 static int ocfs2_xattr_value_truncate(struct inode *inode, 445 struct buffer_head *root_bh, 446 struct ocfs2_xattr_value_root *xv, 447 int len) 448 { 449 int ret; 450 u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len); 451 u32 old_clusters = le32_to_cpu(xv->xr_clusters); 452 453 if (new_clusters == old_clusters) 454 return 0; 455 456 if (new_clusters > old_clusters) 457 ret = ocfs2_xattr_extend_allocation(inode, 458 new_clusters - old_clusters, 459 root_bh, xv); 460 else 461 ret = ocfs2_xattr_shrink_size(inode, 462 old_clusters, new_clusters, 463 root_bh, xv); 464 465 return ret; 466 } 467 468 static int ocfs2_xattr_list_entry(char *buffer, size_t size, 469 size_t *result, const char *prefix, 470 const char *name, int name_len) 471 { 472 char *p = buffer + *result; 473 int prefix_len = strlen(prefix); 474 int total_len = prefix_len + name_len + 1; 475 476 *result += total_len; 477 478 /* we are just looking for how big our buffer needs to be */ 479 if (!size) 480 return 0; 481 482 if (*result > size) 483 return -ERANGE; 484 485 memcpy(p, prefix, prefix_len); 486 memcpy(p + prefix_len, name, name_len); 487 p[prefix_len + name_len] = '\0'; 488 489 return 0; 490 } 491 492 static int ocfs2_xattr_list_entries(struct inode *inode, 493 struct ocfs2_xattr_header *header, 494 char *buffer, size_t buffer_size) 495 { 496 size_t result = 0; 497 int i, type, ret; 498 const char *prefix, *name; 499 500 for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) { 501 struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; 502 type = ocfs2_xattr_get_type(entry); 503 prefix = ocfs2_xattr_prefix(type); 504 505 if (prefix) { 506 name = (const char *)header + 507 le16_to_cpu(entry->xe_name_offset); 508 509 ret = ocfs2_xattr_list_entry(buffer, buffer_size, 510 &result, prefix, name, 511 entry->xe_name_len); 512 if (ret) 513 return ret; 514 } 515 } 516 517 return result; 518 } 519 520 static int ocfs2_xattr_ibody_list(struct inode *inode, 521 struct ocfs2_dinode *di, 522 char *buffer, 523 size_t buffer_size) 524 { 525 struct ocfs2_xattr_header *header = NULL; 526 struct ocfs2_inode_info *oi = OCFS2_I(inode); 527 int ret = 0; 528 529 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) 530 return ret; 531 532 header = (struct ocfs2_xattr_header *) 533 ((void *)di + inode->i_sb->s_blocksize - 534 le16_to_cpu(di->i_xattr_inline_size)); 535 536 ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size); 537 538 return ret; 539 } 540 541 static int ocfs2_xattr_block_list(struct inode *inode, 542 struct ocfs2_dinode *di, 543 char *buffer, 544 size_t buffer_size) 545 { 546 struct buffer_head *blk_bh = NULL; 547 struct ocfs2_xattr_block *xb; 548 int ret = 0; 549 550 if (!di->i_xattr_loc) 551 return ret; 552 553 ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh); 554 if (ret < 0) { 555 mlog_errno(ret); 556 return ret; 557 } 558 559 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 560 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) { 561 ret = -EIO; 562 goto cleanup; 563 } 564 565 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 566 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header; 567 ret = ocfs2_xattr_list_entries(inode, header, 568 buffer, buffer_size); 569 } else { 570 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root; 571 ret = ocfs2_xattr_tree_list_index_block(inode, xt, 572 buffer, buffer_size); 573 } 574 cleanup: 575 brelse(blk_bh); 576 577 return ret; 578 } 579 580 ssize_t ocfs2_listxattr(struct dentry *dentry, 581 char *buffer, 582 size_t size) 583 { 584 int ret = 0, i_ret = 0, b_ret = 0; 585 struct buffer_head *di_bh = NULL; 586 struct ocfs2_dinode *di = NULL; 587 struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode); 588 589 if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb))) 590 return -EOPNOTSUPP; 591 592 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 593 return ret; 594 595 ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0); 596 if (ret < 0) { 597 mlog_errno(ret); 598 return ret; 599 } 600 601 di = (struct ocfs2_dinode *)di_bh->b_data; 602 603 down_read(&oi->ip_xattr_sem); 604 i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size); 605 if (i_ret < 0) 606 b_ret = 0; 607 else { 608 if (buffer) { 609 buffer += i_ret; 610 size -= i_ret; 611 } 612 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di, 613 buffer, size); 614 if (b_ret < 0) 615 i_ret = 0; 616 } 617 up_read(&oi->ip_xattr_sem); 618 ocfs2_inode_unlock(dentry->d_inode, 0); 619 620 brelse(di_bh); 621 622 return i_ret + b_ret; 623 } 624 625 static int ocfs2_xattr_find_entry(int name_index, 626 const char *name, 627 struct ocfs2_xattr_search *xs) 628 { 629 struct ocfs2_xattr_entry *entry; 630 size_t name_len; 631 int i, cmp = 1; 632 633 if (name == NULL) 634 return -EINVAL; 635 636 name_len = strlen(name); 637 entry = xs->here; 638 for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) { 639 cmp = name_index - ocfs2_xattr_get_type(entry); 640 if (!cmp) 641 cmp = name_len - entry->xe_name_len; 642 if (!cmp) 643 cmp = memcmp(name, (xs->base + 644 le16_to_cpu(entry->xe_name_offset)), 645 name_len); 646 if (cmp == 0) 647 break; 648 entry += 1; 649 } 650 xs->here = entry; 651 652 return cmp ? -ENODATA : 0; 653 } 654 655 static int ocfs2_xattr_get_value_outside(struct inode *inode, 656 struct ocfs2_xattr_value_root *xv, 657 void *buffer, 658 size_t len) 659 { 660 u32 cpos, p_cluster, num_clusters, bpc, clusters; 661 u64 blkno; 662 int i, ret = 0; 663 size_t cplen, blocksize; 664 struct buffer_head *bh = NULL; 665 struct ocfs2_extent_list *el; 666 667 el = &xv->xr_list; 668 clusters = le32_to_cpu(xv->xr_clusters); 669 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 670 blocksize = inode->i_sb->s_blocksize; 671 672 cpos = 0; 673 while (cpos < clusters) { 674 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, 675 &num_clusters, el); 676 if (ret) { 677 mlog_errno(ret); 678 goto out; 679 } 680 681 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); 682 /* Copy ocfs2_xattr_value */ 683 for (i = 0; i < num_clusters * bpc; i++, blkno++) { 684 ret = ocfs2_read_block(inode, blkno, &bh); 685 if (ret) { 686 mlog_errno(ret); 687 goto out; 688 } 689 690 cplen = len >= blocksize ? blocksize : len; 691 memcpy(buffer, bh->b_data, cplen); 692 len -= cplen; 693 buffer += cplen; 694 695 brelse(bh); 696 bh = NULL; 697 if (len == 0) 698 break; 699 } 700 cpos += num_clusters; 701 } 702 out: 703 return ret; 704 } 705 706 static int ocfs2_xattr_ibody_get(struct inode *inode, 707 int name_index, 708 const char *name, 709 void *buffer, 710 size_t buffer_size, 711 struct ocfs2_xattr_search *xs) 712 { 713 struct ocfs2_inode_info *oi = OCFS2_I(inode); 714 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 715 struct ocfs2_xattr_value_root *xv; 716 size_t size; 717 int ret = 0; 718 719 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) 720 return -ENODATA; 721 722 xs->end = (void *)di + inode->i_sb->s_blocksize; 723 xs->header = (struct ocfs2_xattr_header *) 724 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 725 xs->base = (void *)xs->header; 726 xs->here = xs->header->xh_entries; 727 728 ret = ocfs2_xattr_find_entry(name_index, name, xs); 729 if (ret) 730 return ret; 731 size = le64_to_cpu(xs->here->xe_value_size); 732 if (buffer) { 733 if (size > buffer_size) 734 return -ERANGE; 735 if (ocfs2_xattr_is_local(xs->here)) { 736 memcpy(buffer, (void *)xs->base + 737 le16_to_cpu(xs->here->xe_name_offset) + 738 OCFS2_XATTR_SIZE(xs->here->xe_name_len), size); 739 } else { 740 xv = (struct ocfs2_xattr_value_root *) 741 (xs->base + le16_to_cpu( 742 xs->here->xe_name_offset) + 743 OCFS2_XATTR_SIZE(xs->here->xe_name_len)); 744 ret = ocfs2_xattr_get_value_outside(inode, xv, 745 buffer, size); 746 if (ret < 0) { 747 mlog_errno(ret); 748 return ret; 749 } 750 } 751 } 752 753 return size; 754 } 755 756 static int ocfs2_xattr_block_get(struct inode *inode, 757 int name_index, 758 const char *name, 759 void *buffer, 760 size_t buffer_size, 761 struct ocfs2_xattr_search *xs) 762 { 763 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 764 struct buffer_head *blk_bh = NULL; 765 struct ocfs2_xattr_block *xb; 766 struct ocfs2_xattr_value_root *xv; 767 size_t size; 768 int ret = -ENODATA, name_offset, name_len, block_off, i; 769 770 if (!di->i_xattr_loc) 771 return ret; 772 773 memset(&xs->bucket, 0, sizeof(xs->bucket)); 774 775 ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh); 776 if (ret < 0) { 777 mlog_errno(ret); 778 return ret; 779 } 780 781 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 782 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) { 783 ret = -EIO; 784 goto cleanup; 785 } 786 787 xs->xattr_bh = blk_bh; 788 789 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 790 xs->header = &xb->xb_attrs.xb_header; 791 xs->base = (void *)xs->header; 792 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 793 xs->here = xs->header->xh_entries; 794 795 ret = ocfs2_xattr_find_entry(name_index, name, xs); 796 } else 797 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 798 name_index, 799 name, xs); 800 801 if (ret) 802 goto cleanup; 803 size = le64_to_cpu(xs->here->xe_value_size); 804 if (buffer) { 805 ret = -ERANGE; 806 if (size > buffer_size) 807 goto cleanup; 808 809 name_offset = le16_to_cpu(xs->here->xe_name_offset); 810 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len); 811 i = xs->here - xs->header->xh_entries; 812 813 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) { 814 ret = ocfs2_xattr_bucket_get_name_value(inode, 815 xs->bucket.xh, 816 i, 817 &block_off, 818 &name_offset); 819 xs->base = xs->bucket.bhs[block_off]->b_data; 820 } 821 if (ocfs2_xattr_is_local(xs->here)) { 822 memcpy(buffer, (void *)xs->base + 823 name_offset + name_len, size); 824 } else { 825 xv = (struct ocfs2_xattr_value_root *) 826 (xs->base + name_offset + name_len); 827 ret = ocfs2_xattr_get_value_outside(inode, xv, 828 buffer, size); 829 if (ret < 0) { 830 mlog_errno(ret); 831 goto cleanup; 832 } 833 } 834 } 835 ret = size; 836 cleanup: 837 for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++) 838 brelse(xs->bucket.bhs[i]); 839 memset(&xs->bucket, 0, sizeof(xs->bucket)); 840 841 brelse(blk_bh); 842 return ret; 843 } 844 845 /* ocfs2_xattr_get() 846 * 847 * Copy an extended attribute into the buffer provided. 848 * Buffer is NULL to compute the size of buffer required. 849 */ 850 static int ocfs2_xattr_get(struct inode *inode, 851 int name_index, 852 const char *name, 853 void *buffer, 854 size_t buffer_size) 855 { 856 int ret; 857 struct ocfs2_dinode *di = NULL; 858 struct buffer_head *di_bh = NULL; 859 struct ocfs2_inode_info *oi = OCFS2_I(inode); 860 struct ocfs2_xattr_search xis = { 861 .not_found = -ENODATA, 862 }; 863 struct ocfs2_xattr_search xbs = { 864 .not_found = -ENODATA, 865 }; 866 867 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 868 return -EOPNOTSUPP; 869 870 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 871 ret = -ENODATA; 872 873 ret = ocfs2_inode_lock(inode, &di_bh, 0); 874 if (ret < 0) { 875 mlog_errno(ret); 876 return ret; 877 } 878 xis.inode_bh = xbs.inode_bh = di_bh; 879 di = (struct ocfs2_dinode *)di_bh->b_data; 880 881 down_read(&oi->ip_xattr_sem); 882 ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer, 883 buffer_size, &xis); 884 if (ret == -ENODATA) 885 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer, 886 buffer_size, &xbs); 887 up_read(&oi->ip_xattr_sem); 888 ocfs2_inode_unlock(inode, 0); 889 890 brelse(di_bh); 891 892 return ret; 893 } 894 895 static int __ocfs2_xattr_set_value_outside(struct inode *inode, 896 struct ocfs2_xattr_value_root *xv, 897 const void *value, 898 int value_len) 899 { 900 int ret = 0, i, cp_len, credits; 901 u16 blocksize = inode->i_sb->s_blocksize; 902 u32 p_cluster, num_clusters; 903 u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 904 u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len); 905 u64 blkno; 906 struct buffer_head *bh = NULL; 907 handle_t *handle; 908 909 BUG_ON(clusters > le32_to_cpu(xv->xr_clusters)); 910 911 credits = clusters * bpc; 912 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits); 913 if (IS_ERR(handle)) { 914 ret = PTR_ERR(handle); 915 mlog_errno(ret); 916 goto out; 917 } 918 919 while (cpos < clusters) { 920 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, 921 &num_clusters, &xv->xr_list); 922 if (ret) { 923 mlog_errno(ret); 924 goto out_commit; 925 } 926 927 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); 928 929 for (i = 0; i < num_clusters * bpc; i++, blkno++) { 930 ret = ocfs2_read_block(inode, blkno, &bh); 931 if (ret) { 932 mlog_errno(ret); 933 goto out_commit; 934 } 935 936 ret = ocfs2_journal_access(handle, 937 inode, 938 bh, 939 OCFS2_JOURNAL_ACCESS_WRITE); 940 if (ret < 0) { 941 mlog_errno(ret); 942 goto out_commit; 943 } 944 945 cp_len = value_len > blocksize ? blocksize : value_len; 946 memcpy(bh->b_data, value, cp_len); 947 value_len -= cp_len; 948 value += cp_len; 949 if (cp_len < blocksize) 950 memset(bh->b_data + cp_len, 0, 951 blocksize - cp_len); 952 953 ret = ocfs2_journal_dirty(handle, bh); 954 if (ret < 0) { 955 mlog_errno(ret); 956 goto out_commit; 957 } 958 brelse(bh); 959 bh = NULL; 960 961 /* 962 * XXX: do we need to empty all the following 963 * blocks in this cluster? 964 */ 965 if (!value_len) 966 break; 967 } 968 cpos += num_clusters; 969 } 970 out_commit: 971 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 972 out: 973 brelse(bh); 974 975 return ret; 976 } 977 978 static int ocfs2_xattr_cleanup(struct inode *inode, 979 struct ocfs2_xattr_info *xi, 980 struct ocfs2_xattr_search *xs, 981 size_t offs) 982 { 983 handle_t *handle = NULL; 984 int ret = 0; 985 size_t name_len = strlen(xi->name); 986 void *val = xs->base + offs; 987 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 988 989 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 990 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 991 if (IS_ERR(handle)) { 992 ret = PTR_ERR(handle); 993 mlog_errno(ret); 994 goto out; 995 } 996 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 997 OCFS2_JOURNAL_ACCESS_WRITE); 998 if (ret) { 999 mlog_errno(ret); 1000 goto out_commit; 1001 } 1002 /* Decrease xattr count */ 1003 le16_add_cpu(&xs->header->xh_count, -1); 1004 /* Remove the xattr entry and tree root which has already be set*/ 1005 memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry)); 1006 memset(val, 0, size); 1007 1008 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1009 if (ret < 0) 1010 mlog_errno(ret); 1011 out_commit: 1012 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1013 out: 1014 return ret; 1015 } 1016 1017 static int ocfs2_xattr_update_entry(struct inode *inode, 1018 struct ocfs2_xattr_info *xi, 1019 struct ocfs2_xattr_search *xs, 1020 size_t offs) 1021 { 1022 handle_t *handle = NULL; 1023 int ret = 0; 1024 1025 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1026 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1027 if (IS_ERR(handle)) { 1028 ret = PTR_ERR(handle); 1029 mlog_errno(ret); 1030 goto out; 1031 } 1032 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1033 OCFS2_JOURNAL_ACCESS_WRITE); 1034 if (ret) { 1035 mlog_errno(ret); 1036 goto out_commit; 1037 } 1038 1039 xs->here->xe_name_offset = cpu_to_le16(offs); 1040 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1041 if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE) 1042 ocfs2_xattr_set_local(xs->here, 1); 1043 else 1044 ocfs2_xattr_set_local(xs->here, 0); 1045 ocfs2_xattr_hash_entry(inode, xs->header, xs->here); 1046 1047 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1048 if (ret < 0) 1049 mlog_errno(ret); 1050 out_commit: 1051 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1052 out: 1053 return ret; 1054 } 1055 1056 /* 1057 * ocfs2_xattr_set_value_outside() 1058 * 1059 * Set large size value in B tree. 1060 */ 1061 static int ocfs2_xattr_set_value_outside(struct inode *inode, 1062 struct ocfs2_xattr_info *xi, 1063 struct ocfs2_xattr_search *xs, 1064 size_t offs) 1065 { 1066 size_t name_len = strlen(xi->name); 1067 void *val = xs->base + offs; 1068 struct ocfs2_xattr_value_root *xv = NULL; 1069 size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 1070 int ret = 0; 1071 1072 memset(val, 0, size); 1073 memcpy(val, xi->name, name_len); 1074 xv = (struct ocfs2_xattr_value_root *) 1075 (val + OCFS2_XATTR_SIZE(name_len)); 1076 xv->xr_clusters = 0; 1077 xv->xr_last_eb_blk = 0; 1078 xv->xr_list.l_tree_depth = 0; 1079 xv->xr_list.l_count = cpu_to_le16(1); 1080 xv->xr_list.l_next_free_rec = 0; 1081 1082 ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv, 1083 xi->value_len); 1084 if (ret < 0) { 1085 mlog_errno(ret); 1086 return ret; 1087 } 1088 ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value, 1089 xi->value_len); 1090 if (ret < 0) { 1091 mlog_errno(ret); 1092 return ret; 1093 } 1094 ret = ocfs2_xattr_update_entry(inode, xi, xs, offs); 1095 if (ret < 0) 1096 mlog_errno(ret); 1097 1098 return ret; 1099 } 1100 1101 /* 1102 * ocfs2_xattr_set_entry_local() 1103 * 1104 * Set, replace or remove extended attribute in local. 1105 */ 1106 static void ocfs2_xattr_set_entry_local(struct inode *inode, 1107 struct ocfs2_xattr_info *xi, 1108 struct ocfs2_xattr_search *xs, 1109 struct ocfs2_xattr_entry *last, 1110 size_t min_offs) 1111 { 1112 size_t name_len = strlen(xi->name); 1113 int i; 1114 1115 if (xi->value && xs->not_found) { 1116 /* Insert the new xattr entry. */ 1117 le16_add_cpu(&xs->header->xh_count, 1); 1118 ocfs2_xattr_set_type(last, xi->name_index); 1119 ocfs2_xattr_set_local(last, 1); 1120 last->xe_name_len = name_len; 1121 } else { 1122 void *first_val; 1123 void *val; 1124 size_t offs, size; 1125 1126 first_val = xs->base + min_offs; 1127 offs = le16_to_cpu(xs->here->xe_name_offset); 1128 val = xs->base + offs; 1129 1130 if (le64_to_cpu(xs->here->xe_value_size) > 1131 OCFS2_XATTR_INLINE_SIZE) 1132 size = OCFS2_XATTR_SIZE(name_len) + 1133 OCFS2_XATTR_ROOT_SIZE; 1134 else 1135 size = OCFS2_XATTR_SIZE(name_len) + 1136 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1137 1138 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) + 1139 OCFS2_XATTR_SIZE(xi->value_len)) { 1140 /* The old and the new value have the 1141 same size. Just replace the value. */ 1142 ocfs2_xattr_set_local(xs->here, 1); 1143 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1144 /* Clear value bytes. */ 1145 memset(val + OCFS2_XATTR_SIZE(name_len), 1146 0, 1147 OCFS2_XATTR_SIZE(xi->value_len)); 1148 memcpy(val + OCFS2_XATTR_SIZE(name_len), 1149 xi->value, 1150 xi->value_len); 1151 return; 1152 } 1153 /* Remove the old name+value. */ 1154 memmove(first_val + size, first_val, val - first_val); 1155 memset(first_val, 0, size); 1156 xs->here->xe_name_hash = 0; 1157 xs->here->xe_name_offset = 0; 1158 ocfs2_xattr_set_local(xs->here, 1); 1159 xs->here->xe_value_size = 0; 1160 1161 min_offs += size; 1162 1163 /* Adjust all value offsets. */ 1164 last = xs->header->xh_entries; 1165 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { 1166 size_t o = le16_to_cpu(last->xe_name_offset); 1167 1168 if (o < offs) 1169 last->xe_name_offset = cpu_to_le16(o + size); 1170 last += 1; 1171 } 1172 1173 if (!xi->value) { 1174 /* Remove the old entry. */ 1175 last -= 1; 1176 memmove(xs->here, xs->here + 1, 1177 (void *)last - (void *)xs->here); 1178 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 1179 le16_add_cpu(&xs->header->xh_count, -1); 1180 } 1181 } 1182 if (xi->value) { 1183 /* Insert the new name+value. */ 1184 size_t size = OCFS2_XATTR_SIZE(name_len) + 1185 OCFS2_XATTR_SIZE(xi->value_len); 1186 void *val = xs->base + min_offs - size; 1187 1188 xs->here->xe_name_offset = cpu_to_le16(min_offs - size); 1189 memset(val, 0, size); 1190 memcpy(val, xi->name, name_len); 1191 memcpy(val + OCFS2_XATTR_SIZE(name_len), 1192 xi->value, 1193 xi->value_len); 1194 xs->here->xe_value_size = cpu_to_le64(xi->value_len); 1195 ocfs2_xattr_set_local(xs->here, 1); 1196 ocfs2_xattr_hash_entry(inode, xs->header, xs->here); 1197 } 1198 1199 return; 1200 } 1201 1202 /* 1203 * ocfs2_xattr_set_entry() 1204 * 1205 * Set extended attribute entry into inode or block. 1206 * 1207 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE, 1208 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(), 1209 * then set value in B tree with set_value_outside(). 1210 */ 1211 static int ocfs2_xattr_set_entry(struct inode *inode, 1212 struct ocfs2_xattr_info *xi, 1213 struct ocfs2_xattr_search *xs, 1214 int flag) 1215 { 1216 struct ocfs2_xattr_entry *last; 1217 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1218 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1219 size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name); 1220 size_t size_l = 0; 1221 handle_t *handle = NULL; 1222 int free, i, ret; 1223 struct ocfs2_xattr_info xi_l = { 1224 .name_index = xi->name_index, 1225 .name = xi->name, 1226 .value = xi->value, 1227 .value_len = xi->value_len, 1228 }; 1229 1230 /* Compute min_offs, last and free space. */ 1231 last = xs->header->xh_entries; 1232 1233 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { 1234 size_t offs = le16_to_cpu(last->xe_name_offset); 1235 if (offs < min_offs) 1236 min_offs = offs; 1237 last += 1; 1238 } 1239 1240 free = min_offs - ((void *)last - xs->base) - sizeof(__u32); 1241 if (free < 0) 1242 return -EIO; 1243 1244 if (!xs->not_found) { 1245 size_t size = 0; 1246 if (ocfs2_xattr_is_local(xs->here)) 1247 size = OCFS2_XATTR_SIZE(name_len) + 1248 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1249 else 1250 size = OCFS2_XATTR_SIZE(name_len) + 1251 OCFS2_XATTR_ROOT_SIZE; 1252 free += (size + sizeof(struct ocfs2_xattr_entry)); 1253 } 1254 /* Check free space in inode or block */ 1255 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1256 if (free < sizeof(struct ocfs2_xattr_entry) + 1257 OCFS2_XATTR_SIZE(name_len) + 1258 OCFS2_XATTR_ROOT_SIZE) { 1259 ret = -ENOSPC; 1260 goto out; 1261 } 1262 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; 1263 xi_l.value = (void *)&def_xv; 1264 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE; 1265 } else if (xi->value) { 1266 if (free < sizeof(struct ocfs2_xattr_entry) + 1267 OCFS2_XATTR_SIZE(name_len) + 1268 OCFS2_XATTR_SIZE(xi->value_len)) { 1269 ret = -ENOSPC; 1270 goto out; 1271 } 1272 } 1273 1274 if (!xs->not_found) { 1275 /* For existing extended attribute */ 1276 size_t size = OCFS2_XATTR_SIZE(name_len) + 1277 OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); 1278 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1279 void *val = xs->base + offs; 1280 1281 if (ocfs2_xattr_is_local(xs->here) && size == size_l) { 1282 /* Replace existing local xattr with tree root */ 1283 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, 1284 offs); 1285 if (ret < 0) 1286 mlog_errno(ret); 1287 goto out; 1288 } else if (!ocfs2_xattr_is_local(xs->here)) { 1289 /* For existing xattr which has value outside */ 1290 struct ocfs2_xattr_value_root *xv = NULL; 1291 xv = (struct ocfs2_xattr_value_root *)(val + 1292 OCFS2_XATTR_SIZE(name_len)); 1293 1294 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1295 /* 1296 * If new value need set outside also, 1297 * first truncate old value to new value, 1298 * then set new value with set_value_outside(). 1299 */ 1300 ret = ocfs2_xattr_value_truncate(inode, 1301 xs->xattr_bh, 1302 xv, 1303 xi->value_len); 1304 if (ret < 0) { 1305 mlog_errno(ret); 1306 goto out; 1307 } 1308 1309 ret = __ocfs2_xattr_set_value_outside(inode, 1310 xv, 1311 xi->value, 1312 xi->value_len); 1313 if (ret < 0) { 1314 mlog_errno(ret); 1315 goto out; 1316 } 1317 1318 ret = ocfs2_xattr_update_entry(inode, 1319 xi, 1320 xs, 1321 offs); 1322 if (ret < 0) 1323 mlog_errno(ret); 1324 goto out; 1325 } else { 1326 /* 1327 * If new value need set in local, 1328 * just trucate old value to zero. 1329 */ 1330 ret = ocfs2_xattr_value_truncate(inode, 1331 xs->xattr_bh, 1332 xv, 1333 0); 1334 if (ret < 0) 1335 mlog_errno(ret); 1336 } 1337 } 1338 } 1339 1340 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1341 OCFS2_INODE_UPDATE_CREDITS); 1342 if (IS_ERR(handle)) { 1343 ret = PTR_ERR(handle); 1344 mlog_errno(ret); 1345 goto out; 1346 } 1347 1348 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1349 OCFS2_JOURNAL_ACCESS_WRITE); 1350 if (ret) { 1351 mlog_errno(ret); 1352 goto out_commit; 1353 } 1354 1355 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1356 /* set extended attribute in external block. */ 1357 ret = ocfs2_extend_trans(handle, 1358 OCFS2_INODE_UPDATE_CREDITS + 1359 OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1360 if (ret) { 1361 mlog_errno(ret); 1362 goto out_commit; 1363 } 1364 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1365 OCFS2_JOURNAL_ACCESS_WRITE); 1366 if (ret) { 1367 mlog_errno(ret); 1368 goto out_commit; 1369 } 1370 } 1371 1372 /* 1373 * Set value in local, include set tree root in local. 1374 * This is the first step for value size >INLINE_SIZE. 1375 */ 1376 ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs); 1377 1378 if (!(flag & OCFS2_INLINE_XATTR_FL)) { 1379 ret = ocfs2_journal_dirty(handle, xs->xattr_bh); 1380 if (ret < 0) { 1381 mlog_errno(ret); 1382 goto out_commit; 1383 } 1384 } 1385 1386 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) && 1387 (flag & OCFS2_INLINE_XATTR_FL)) { 1388 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1389 unsigned int xattrsize = osb->s_xattr_inline_size; 1390 1391 /* 1392 * Adjust extent record count or inline data size 1393 * to reserve space for extended attribute. 1394 */ 1395 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1396 struct ocfs2_inline_data *idata = &di->id2.i_data; 1397 le16_add_cpu(&idata->id_count, -xattrsize); 1398 } else if (!(ocfs2_inode_is_fast_symlink(inode))) { 1399 struct ocfs2_extent_list *el = &di->id2.i_list; 1400 le16_add_cpu(&el->l_count, -(xattrsize / 1401 sizeof(struct ocfs2_extent_rec))); 1402 } 1403 di->i_xattr_inline_size = cpu_to_le16(xattrsize); 1404 } 1405 /* Update xattr flag */ 1406 spin_lock(&oi->ip_lock); 1407 oi->ip_dyn_features |= flag; 1408 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1409 spin_unlock(&oi->ip_lock); 1410 /* Update inode ctime */ 1411 inode->i_ctime = CURRENT_TIME; 1412 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); 1413 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 1414 1415 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1416 if (ret < 0) 1417 mlog_errno(ret); 1418 1419 out_commit: 1420 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1421 1422 if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { 1423 /* 1424 * Set value outside in B tree. 1425 * This is the second step for value size > INLINE_SIZE. 1426 */ 1427 size_t offs = le16_to_cpu(xs->here->xe_name_offset); 1428 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs); 1429 if (ret < 0) { 1430 int ret2; 1431 1432 mlog_errno(ret); 1433 /* 1434 * If set value outside failed, we have to clean 1435 * the junk tree root we have already set in local. 1436 */ 1437 ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs); 1438 if (ret2 < 0) 1439 mlog_errno(ret2); 1440 } 1441 } 1442 out: 1443 return ret; 1444 1445 } 1446 1447 static int ocfs2_remove_value_outside(struct inode*inode, 1448 struct buffer_head *bh, 1449 struct ocfs2_xattr_header *header) 1450 { 1451 int ret = 0, i; 1452 1453 for (i = 0; i < le16_to_cpu(header->xh_count); i++) { 1454 struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; 1455 1456 if (!ocfs2_xattr_is_local(entry)) { 1457 struct ocfs2_xattr_value_root *xv; 1458 void *val; 1459 1460 val = (void *)header + 1461 le16_to_cpu(entry->xe_name_offset); 1462 xv = (struct ocfs2_xattr_value_root *) 1463 (val + OCFS2_XATTR_SIZE(entry->xe_name_len)); 1464 ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0); 1465 if (ret < 0) { 1466 mlog_errno(ret); 1467 return ret; 1468 } 1469 } 1470 } 1471 1472 return ret; 1473 } 1474 1475 static int ocfs2_xattr_ibody_remove(struct inode *inode, 1476 struct buffer_head *di_bh) 1477 { 1478 1479 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1480 struct ocfs2_xattr_header *header; 1481 int ret; 1482 1483 header = (struct ocfs2_xattr_header *) 1484 ((void *)di + inode->i_sb->s_blocksize - 1485 le16_to_cpu(di->i_xattr_inline_size)); 1486 1487 ret = ocfs2_remove_value_outside(inode, di_bh, header); 1488 1489 return ret; 1490 } 1491 1492 static int ocfs2_xattr_block_remove(struct inode *inode, 1493 struct buffer_head *blk_bh) 1494 { 1495 struct ocfs2_xattr_block *xb; 1496 int ret = 0; 1497 1498 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1499 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1500 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header); 1501 ret = ocfs2_remove_value_outside(inode, blk_bh, header); 1502 } else 1503 ret = ocfs2_delete_xattr_index_block(inode, blk_bh); 1504 1505 return ret; 1506 } 1507 1508 static int ocfs2_xattr_free_block(struct inode *inode, 1509 u64 block) 1510 { 1511 struct inode *xb_alloc_inode; 1512 struct buffer_head *xb_alloc_bh = NULL; 1513 struct buffer_head *blk_bh = NULL; 1514 struct ocfs2_xattr_block *xb; 1515 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1516 handle_t *handle; 1517 int ret = 0; 1518 u64 blk, bg_blkno; 1519 u16 bit; 1520 1521 ret = ocfs2_read_block(inode, block, &blk_bh); 1522 if (ret < 0) { 1523 mlog_errno(ret); 1524 goto out; 1525 } 1526 1527 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1528 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) { 1529 ret = -EIO; 1530 goto out; 1531 } 1532 1533 ret = ocfs2_xattr_block_remove(inode, blk_bh); 1534 if (ret < 0) { 1535 mlog_errno(ret); 1536 goto out; 1537 } 1538 1539 blk = le64_to_cpu(xb->xb_blkno); 1540 bit = le16_to_cpu(xb->xb_suballoc_bit); 1541 bg_blkno = ocfs2_which_suballoc_group(blk, bit); 1542 1543 xb_alloc_inode = ocfs2_get_system_file_inode(osb, 1544 EXTENT_ALLOC_SYSTEM_INODE, 1545 le16_to_cpu(xb->xb_suballoc_slot)); 1546 if (!xb_alloc_inode) { 1547 ret = -ENOMEM; 1548 mlog_errno(ret); 1549 goto out; 1550 } 1551 mutex_lock(&xb_alloc_inode->i_mutex); 1552 1553 ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1); 1554 if (ret < 0) { 1555 mlog_errno(ret); 1556 goto out_mutex; 1557 } 1558 1559 handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE); 1560 if (IS_ERR(handle)) { 1561 ret = PTR_ERR(handle); 1562 mlog_errno(ret); 1563 goto out_unlock; 1564 } 1565 1566 ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh, 1567 bit, bg_blkno, 1); 1568 if (ret < 0) 1569 mlog_errno(ret); 1570 1571 ocfs2_commit_trans(osb, handle); 1572 out_unlock: 1573 ocfs2_inode_unlock(xb_alloc_inode, 1); 1574 brelse(xb_alloc_bh); 1575 out_mutex: 1576 mutex_unlock(&xb_alloc_inode->i_mutex); 1577 iput(xb_alloc_inode); 1578 out: 1579 brelse(blk_bh); 1580 return ret; 1581 } 1582 1583 /* 1584 * ocfs2_xattr_remove() 1585 * 1586 * Free extended attribute resources associated with this inode. 1587 */ 1588 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh) 1589 { 1590 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1591 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; 1592 handle_t *handle; 1593 int ret; 1594 1595 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 1596 return 0; 1597 1598 if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) 1599 return 0; 1600 1601 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1602 ret = ocfs2_xattr_ibody_remove(inode, di_bh); 1603 if (ret < 0) { 1604 mlog_errno(ret); 1605 goto out; 1606 } 1607 } 1608 1609 if (di->i_xattr_loc) { 1610 ret = ocfs2_xattr_free_block(inode, 1611 le64_to_cpu(di->i_xattr_loc)); 1612 if (ret < 0) { 1613 mlog_errno(ret); 1614 goto out; 1615 } 1616 } 1617 1618 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1619 OCFS2_INODE_UPDATE_CREDITS); 1620 if (IS_ERR(handle)) { 1621 ret = PTR_ERR(handle); 1622 mlog_errno(ret); 1623 goto out; 1624 } 1625 ret = ocfs2_journal_access(handle, inode, di_bh, 1626 OCFS2_JOURNAL_ACCESS_WRITE); 1627 if (ret) { 1628 mlog_errno(ret); 1629 goto out_commit; 1630 } 1631 1632 di->i_xattr_loc = 0; 1633 1634 spin_lock(&oi->ip_lock); 1635 oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL); 1636 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); 1637 spin_unlock(&oi->ip_lock); 1638 1639 ret = ocfs2_journal_dirty(handle, di_bh); 1640 if (ret < 0) 1641 mlog_errno(ret); 1642 out_commit: 1643 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 1644 out: 1645 return ret; 1646 } 1647 1648 static int ocfs2_xattr_has_space_inline(struct inode *inode, 1649 struct ocfs2_dinode *di) 1650 { 1651 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1652 unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size; 1653 int free; 1654 1655 if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE) 1656 return 0; 1657 1658 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { 1659 struct ocfs2_inline_data *idata = &di->id2.i_data; 1660 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size); 1661 } else if (ocfs2_inode_is_fast_symlink(inode)) { 1662 free = ocfs2_fast_symlink_chars(inode->i_sb) - 1663 le64_to_cpu(di->i_size); 1664 } else { 1665 struct ocfs2_extent_list *el = &di->id2.i_list; 1666 free = (le16_to_cpu(el->l_count) - 1667 le16_to_cpu(el->l_next_free_rec)) * 1668 sizeof(struct ocfs2_extent_rec); 1669 } 1670 if (free >= xattrsize) 1671 return 1; 1672 1673 return 0; 1674 } 1675 1676 /* 1677 * ocfs2_xattr_ibody_find() 1678 * 1679 * Find extended attribute in inode block and 1680 * fill search info into struct ocfs2_xattr_search. 1681 */ 1682 static int ocfs2_xattr_ibody_find(struct inode *inode, 1683 int name_index, 1684 const char *name, 1685 struct ocfs2_xattr_search *xs) 1686 { 1687 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1688 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1689 int ret; 1690 int has_space = 0; 1691 1692 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1693 return 0; 1694 1695 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1696 down_read(&oi->ip_alloc_sem); 1697 has_space = ocfs2_xattr_has_space_inline(inode, di); 1698 up_read(&oi->ip_alloc_sem); 1699 if (!has_space) 1700 return 0; 1701 } 1702 1703 xs->xattr_bh = xs->inode_bh; 1704 xs->end = (void *)di + inode->i_sb->s_blocksize; 1705 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) 1706 xs->header = (struct ocfs2_xattr_header *) 1707 (xs->end - le16_to_cpu(di->i_xattr_inline_size)); 1708 else 1709 xs->header = (struct ocfs2_xattr_header *) 1710 (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size); 1711 xs->base = (void *)xs->header; 1712 xs->here = xs->header->xh_entries; 1713 1714 /* Find the named attribute. */ 1715 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { 1716 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1717 if (ret && ret != -ENODATA) 1718 return ret; 1719 xs->not_found = ret; 1720 } 1721 1722 return 0; 1723 } 1724 1725 /* 1726 * ocfs2_xattr_ibody_set() 1727 * 1728 * Set, replace or remove an extended attribute into inode block. 1729 * 1730 */ 1731 static int ocfs2_xattr_ibody_set(struct inode *inode, 1732 struct ocfs2_xattr_info *xi, 1733 struct ocfs2_xattr_search *xs) 1734 { 1735 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1736 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1737 int ret; 1738 1739 if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) 1740 return -ENOSPC; 1741 1742 down_write(&oi->ip_alloc_sem); 1743 if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { 1744 if (!ocfs2_xattr_has_space_inline(inode, di)) { 1745 ret = -ENOSPC; 1746 goto out; 1747 } 1748 } 1749 1750 ret = ocfs2_xattr_set_entry(inode, xi, xs, 1751 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL)); 1752 out: 1753 up_write(&oi->ip_alloc_sem); 1754 1755 return ret; 1756 } 1757 1758 /* 1759 * ocfs2_xattr_block_find() 1760 * 1761 * Find extended attribute in external block and 1762 * fill search info into struct ocfs2_xattr_search. 1763 */ 1764 static int ocfs2_xattr_block_find(struct inode *inode, 1765 int name_index, 1766 const char *name, 1767 struct ocfs2_xattr_search *xs) 1768 { 1769 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1770 struct buffer_head *blk_bh = NULL; 1771 struct ocfs2_xattr_block *xb; 1772 int ret = 0; 1773 1774 if (!di->i_xattr_loc) 1775 return ret; 1776 1777 ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh); 1778 if (ret < 0) { 1779 mlog_errno(ret); 1780 return ret; 1781 } 1782 1783 xb = (struct ocfs2_xattr_block *)blk_bh->b_data; 1784 if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) { 1785 ret = -EIO; 1786 goto cleanup; 1787 } 1788 1789 xs->xattr_bh = blk_bh; 1790 1791 if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { 1792 xs->header = &xb->xb_attrs.xb_header; 1793 xs->base = (void *)xs->header; 1794 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; 1795 xs->here = xs->header->xh_entries; 1796 1797 ret = ocfs2_xattr_find_entry(name_index, name, xs); 1798 } else 1799 ret = ocfs2_xattr_index_block_find(inode, blk_bh, 1800 name_index, 1801 name, xs); 1802 1803 if (ret && ret != -ENODATA) { 1804 xs->xattr_bh = NULL; 1805 goto cleanup; 1806 } 1807 xs->not_found = ret; 1808 return 0; 1809 cleanup: 1810 brelse(blk_bh); 1811 1812 return ret; 1813 } 1814 1815 /* 1816 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree 1817 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header 1818 * re-initialized. 1819 */ 1820 static int ocfs2_restore_xattr_block(struct inode *inode, 1821 struct ocfs2_xattr_search *xs) 1822 { 1823 int ret; 1824 handle_t *handle; 1825 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1826 struct ocfs2_xattr_block *xb = 1827 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1828 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 1829 u16 xb_flags = le16_to_cpu(xb->xb_flags); 1830 1831 BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) || 1832 le16_to_cpu(el->l_next_free_rec) != 0); 1833 1834 handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS); 1835 if (IS_ERR(handle)) { 1836 ret = PTR_ERR(handle); 1837 handle = NULL; 1838 goto out; 1839 } 1840 1841 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, 1842 OCFS2_JOURNAL_ACCESS_WRITE); 1843 if (ret < 0) { 1844 mlog_errno(ret); 1845 goto out_commit; 1846 } 1847 1848 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 1849 offsetof(struct ocfs2_xattr_block, xb_attrs)); 1850 1851 xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED); 1852 1853 ocfs2_journal_dirty(handle, xs->xattr_bh); 1854 1855 out_commit: 1856 ocfs2_commit_trans(osb, handle); 1857 out: 1858 return ret; 1859 } 1860 1861 /* 1862 * ocfs2_xattr_block_set() 1863 * 1864 * Set, replace or remove an extended attribute into external block. 1865 * 1866 */ 1867 static int ocfs2_xattr_block_set(struct inode *inode, 1868 struct ocfs2_xattr_info *xi, 1869 struct ocfs2_xattr_search *xs) 1870 { 1871 struct buffer_head *new_bh = NULL; 1872 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1873 struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; 1874 struct ocfs2_alloc_context *meta_ac = NULL; 1875 handle_t *handle = NULL; 1876 struct ocfs2_xattr_block *xblk = NULL; 1877 u16 suballoc_bit_start; 1878 u32 num_got; 1879 u64 first_blkno; 1880 int ret; 1881 1882 if (!xs->xattr_bh) { 1883 /* 1884 * Alloc one external block for extended attribute 1885 * outside of inode. 1886 */ 1887 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); 1888 if (ret < 0) { 1889 mlog_errno(ret); 1890 goto out; 1891 } 1892 handle = ocfs2_start_trans(osb, 1893 OCFS2_XATTR_BLOCK_CREATE_CREDITS); 1894 if (IS_ERR(handle)) { 1895 ret = PTR_ERR(handle); 1896 mlog_errno(ret); 1897 goto out; 1898 } 1899 ret = ocfs2_journal_access(handle, inode, xs->inode_bh, 1900 OCFS2_JOURNAL_ACCESS_CREATE); 1901 if (ret < 0) { 1902 mlog_errno(ret); 1903 goto out_commit; 1904 } 1905 1906 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, 1907 &suballoc_bit_start, &num_got, 1908 &first_blkno); 1909 if (ret < 0) { 1910 mlog_errno(ret); 1911 goto out_commit; 1912 } 1913 1914 new_bh = sb_getblk(inode->i_sb, first_blkno); 1915 ocfs2_set_new_buffer_uptodate(inode, new_bh); 1916 1917 ret = ocfs2_journal_access(handle, inode, new_bh, 1918 OCFS2_JOURNAL_ACCESS_CREATE); 1919 if (ret < 0) { 1920 mlog_errno(ret); 1921 goto out_commit; 1922 } 1923 1924 /* Initialize ocfs2_xattr_block */ 1925 xs->xattr_bh = new_bh; 1926 xblk = (struct ocfs2_xattr_block *)new_bh->b_data; 1927 memset(xblk, 0, inode->i_sb->s_blocksize); 1928 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE); 1929 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num); 1930 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start); 1931 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation); 1932 xblk->xb_blkno = cpu_to_le64(first_blkno); 1933 1934 xs->header = &xblk->xb_attrs.xb_header; 1935 xs->base = (void *)xs->header; 1936 xs->end = (void *)xblk + inode->i_sb->s_blocksize; 1937 xs->here = xs->header->xh_entries; 1938 1939 1940 ret = ocfs2_journal_dirty(handle, new_bh); 1941 if (ret < 0) { 1942 mlog_errno(ret); 1943 goto out_commit; 1944 } 1945 di->i_xattr_loc = cpu_to_le64(first_blkno); 1946 ret = ocfs2_journal_dirty(handle, xs->inode_bh); 1947 if (ret < 0) 1948 mlog_errno(ret); 1949 out_commit: 1950 ocfs2_commit_trans(osb, handle); 1951 out: 1952 if (meta_ac) 1953 ocfs2_free_alloc_context(meta_ac); 1954 if (ret < 0) 1955 return ret; 1956 } else 1957 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; 1958 1959 if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) { 1960 /* Set extended attribute into external block */ 1961 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL); 1962 if (!ret || ret != -ENOSPC) 1963 goto end; 1964 1965 ret = ocfs2_xattr_create_index_block(inode, xs); 1966 if (ret) 1967 goto end; 1968 } 1969 1970 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs); 1971 if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0) 1972 ret = ocfs2_restore_xattr_block(inode, xs); 1973 1974 end: 1975 1976 return ret; 1977 } 1978 1979 /* 1980 * ocfs2_xattr_set() 1981 * 1982 * Set, replace or remove an extended attribute for this inode. 1983 * value is NULL to remove an existing extended attribute, else either 1984 * create or replace an extended attribute. 1985 */ 1986 int ocfs2_xattr_set(struct inode *inode, 1987 int name_index, 1988 const char *name, 1989 const void *value, 1990 size_t value_len, 1991 int flags) 1992 { 1993 struct buffer_head *di_bh = NULL; 1994 struct ocfs2_dinode *di; 1995 int ret; 1996 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 1997 1998 struct ocfs2_xattr_info xi = { 1999 .name_index = name_index, 2000 .name = name, 2001 .value = value, 2002 .value_len = value_len, 2003 }; 2004 2005 struct ocfs2_xattr_search xis = { 2006 .not_found = -ENODATA, 2007 }; 2008 2009 struct ocfs2_xattr_search xbs = { 2010 .not_found = -ENODATA, 2011 }; 2012 2013 if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) 2014 return -EOPNOTSUPP; 2015 2016 ret = ocfs2_inode_lock(inode, &di_bh, 1); 2017 if (ret < 0) { 2018 mlog_errno(ret); 2019 return ret; 2020 } 2021 xis.inode_bh = xbs.inode_bh = di_bh; 2022 di = (struct ocfs2_dinode *)di_bh->b_data; 2023 2024 down_write(&OCFS2_I(inode)->ip_xattr_sem); 2025 /* 2026 * Scan inode and external block to find the same name 2027 * extended attribute and collect search infomation. 2028 */ 2029 ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis); 2030 if (ret) 2031 goto cleanup; 2032 if (xis.not_found) { 2033 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs); 2034 if (ret) 2035 goto cleanup; 2036 } 2037 2038 if (xis.not_found && xbs.not_found) { 2039 ret = -ENODATA; 2040 if (flags & XATTR_REPLACE) 2041 goto cleanup; 2042 ret = 0; 2043 if (!value) 2044 goto cleanup; 2045 } else { 2046 ret = -EEXIST; 2047 if (flags & XATTR_CREATE) 2048 goto cleanup; 2049 } 2050 2051 if (!value) { 2052 /* Remove existing extended attribute */ 2053 if (!xis.not_found) 2054 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2055 else if (!xbs.not_found) 2056 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2057 } else { 2058 /* We always try to set extended attribute into inode first*/ 2059 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2060 if (!ret && !xbs.not_found) { 2061 /* 2062 * If succeed and that extended attribute existing in 2063 * external block, then we will remove it. 2064 */ 2065 xi.value = NULL; 2066 xi.value_len = 0; 2067 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2068 } else if (ret == -ENOSPC) { 2069 if (di->i_xattr_loc && !xbs.xattr_bh) { 2070 ret = ocfs2_xattr_block_find(inode, name_index, 2071 name, &xbs); 2072 if (ret) 2073 goto cleanup; 2074 } 2075 /* 2076 * If no space in inode, we will set extended attribute 2077 * into external block. 2078 */ 2079 ret = ocfs2_xattr_block_set(inode, &xi, &xbs); 2080 if (ret) 2081 goto cleanup; 2082 if (!xis.not_found) { 2083 /* 2084 * If succeed and that extended attribute 2085 * existing in inode, we will remove it. 2086 */ 2087 xi.value = NULL; 2088 xi.value_len = 0; 2089 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); 2090 } 2091 } 2092 } 2093 cleanup: 2094 up_write(&OCFS2_I(inode)->ip_xattr_sem); 2095 ocfs2_inode_unlock(inode, 1); 2096 brelse(di_bh); 2097 brelse(xbs.xattr_bh); 2098 for (i = 0; i < blk_per_bucket; i++) 2099 brelse(xbs.bucket.bhs[i]); 2100 2101 return ret; 2102 } 2103 2104 /* 2105 * Find the xattr extent rec which may contains name_hash. 2106 * e_cpos will be the first name hash of the xattr rec. 2107 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list. 2108 */ 2109 static int ocfs2_xattr_get_rec(struct inode *inode, 2110 u32 name_hash, 2111 u64 *p_blkno, 2112 u32 *e_cpos, 2113 u32 *num_clusters, 2114 struct ocfs2_extent_list *el) 2115 { 2116 int ret = 0, i; 2117 struct buffer_head *eb_bh = NULL; 2118 struct ocfs2_extent_block *eb; 2119 struct ocfs2_extent_rec *rec = NULL; 2120 u64 e_blkno = 0; 2121 2122 if (el->l_tree_depth) { 2123 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh); 2124 if (ret) { 2125 mlog_errno(ret); 2126 goto out; 2127 } 2128 2129 eb = (struct ocfs2_extent_block *) eb_bh->b_data; 2130 el = &eb->h_list; 2131 2132 if (el->l_tree_depth) { 2133 ocfs2_error(inode->i_sb, 2134 "Inode %lu has non zero tree depth in " 2135 "xattr tree block %llu\n", inode->i_ino, 2136 (unsigned long long)eb_bh->b_blocknr); 2137 ret = -EROFS; 2138 goto out; 2139 } 2140 } 2141 2142 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { 2143 rec = &el->l_recs[i]; 2144 2145 if (le32_to_cpu(rec->e_cpos) <= name_hash) { 2146 e_blkno = le64_to_cpu(rec->e_blkno); 2147 break; 2148 } 2149 } 2150 2151 if (!e_blkno) { 2152 ocfs2_error(inode->i_sb, "Inode %lu has bad extent " 2153 "record (%u, %u, 0) in xattr", inode->i_ino, 2154 le32_to_cpu(rec->e_cpos), 2155 ocfs2_rec_clusters(el, rec)); 2156 ret = -EROFS; 2157 goto out; 2158 } 2159 2160 *p_blkno = le64_to_cpu(rec->e_blkno); 2161 *num_clusters = le16_to_cpu(rec->e_leaf_clusters); 2162 if (e_cpos) 2163 *e_cpos = le32_to_cpu(rec->e_cpos); 2164 out: 2165 brelse(eb_bh); 2166 return ret; 2167 } 2168 2169 typedef int (xattr_bucket_func)(struct inode *inode, 2170 struct ocfs2_xattr_bucket *bucket, 2171 void *para); 2172 2173 static int ocfs2_find_xe_in_bucket(struct inode *inode, 2174 struct buffer_head *header_bh, 2175 int name_index, 2176 const char *name, 2177 u32 name_hash, 2178 u16 *xe_index, 2179 int *found) 2180 { 2181 int i, ret = 0, cmp = 1, block_off, new_offset; 2182 struct ocfs2_xattr_header *xh = 2183 (struct ocfs2_xattr_header *)header_bh->b_data; 2184 size_t name_len = strlen(name); 2185 struct ocfs2_xattr_entry *xe = NULL; 2186 struct buffer_head *name_bh = NULL; 2187 char *xe_name; 2188 2189 /* 2190 * We don't use binary search in the bucket because there 2191 * may be multiple entries with the same name hash. 2192 */ 2193 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 2194 xe = &xh->xh_entries[i]; 2195 2196 if (name_hash > le32_to_cpu(xe->xe_name_hash)) 2197 continue; 2198 else if (name_hash < le32_to_cpu(xe->xe_name_hash)) 2199 break; 2200 2201 cmp = name_index - ocfs2_xattr_get_type(xe); 2202 if (!cmp) 2203 cmp = name_len - xe->xe_name_len; 2204 if (cmp) 2205 continue; 2206 2207 ret = ocfs2_xattr_bucket_get_name_value(inode, 2208 xh, 2209 i, 2210 &block_off, 2211 &new_offset); 2212 if (ret) { 2213 mlog_errno(ret); 2214 break; 2215 } 2216 2217 ret = ocfs2_read_block(inode, header_bh->b_blocknr + block_off, 2218 &name_bh); 2219 if (ret) { 2220 mlog_errno(ret); 2221 break; 2222 } 2223 xe_name = name_bh->b_data + new_offset; 2224 2225 cmp = memcmp(name, xe_name, name_len); 2226 brelse(name_bh); 2227 name_bh = NULL; 2228 2229 if (cmp == 0) { 2230 *xe_index = i; 2231 *found = 1; 2232 ret = 0; 2233 break; 2234 } 2235 } 2236 2237 return ret; 2238 } 2239 2240 /* 2241 * Find the specified xattr entry in a series of buckets. 2242 * This series start from p_blkno and last for num_clusters. 2243 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains 2244 * the num of the valid buckets. 2245 * 2246 * Return the buffer_head this xattr should reside in. And if the xattr's 2247 * hash is in the gap of 2 buckets, return the lower bucket. 2248 */ 2249 static int ocfs2_xattr_bucket_find(struct inode *inode, 2250 int name_index, 2251 const char *name, 2252 u32 name_hash, 2253 u64 p_blkno, 2254 u32 first_hash, 2255 u32 num_clusters, 2256 struct ocfs2_xattr_search *xs) 2257 { 2258 int ret, found = 0; 2259 struct buffer_head *bh = NULL; 2260 struct buffer_head *lower_bh = NULL; 2261 struct ocfs2_xattr_header *xh = NULL; 2262 struct ocfs2_xattr_entry *xe = NULL; 2263 u16 index = 0; 2264 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2265 int low_bucket = 0, bucket, high_bucket; 2266 u32 last_hash; 2267 u64 blkno; 2268 2269 ret = ocfs2_read_block(inode, p_blkno, &bh); 2270 if (ret) { 2271 mlog_errno(ret); 2272 goto out; 2273 } 2274 2275 xh = (struct ocfs2_xattr_header *)bh->b_data; 2276 high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1; 2277 2278 while (low_bucket <= high_bucket) { 2279 brelse(bh); 2280 bh = NULL; 2281 bucket = (low_bucket + high_bucket) / 2; 2282 2283 blkno = p_blkno + bucket * blk_per_bucket; 2284 2285 ret = ocfs2_read_block(inode, blkno, &bh); 2286 if (ret) { 2287 mlog_errno(ret); 2288 goto out; 2289 } 2290 2291 xh = (struct ocfs2_xattr_header *)bh->b_data; 2292 xe = &xh->xh_entries[0]; 2293 if (name_hash < le32_to_cpu(xe->xe_name_hash)) { 2294 high_bucket = bucket - 1; 2295 continue; 2296 } 2297 2298 /* 2299 * Check whether the hash of the last entry in our 2300 * bucket is larger than the search one. for an empty 2301 * bucket, the last one is also the first one. 2302 */ 2303 if (xh->xh_count) 2304 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1]; 2305 2306 last_hash = le32_to_cpu(xe->xe_name_hash); 2307 2308 /* record lower_bh which may be the insert place. */ 2309 brelse(lower_bh); 2310 lower_bh = bh; 2311 bh = NULL; 2312 2313 if (name_hash > le32_to_cpu(xe->xe_name_hash)) { 2314 low_bucket = bucket + 1; 2315 continue; 2316 } 2317 2318 /* the searched xattr should reside in this bucket if exists. */ 2319 ret = ocfs2_find_xe_in_bucket(inode, lower_bh, 2320 name_index, name, name_hash, 2321 &index, &found); 2322 if (ret) { 2323 mlog_errno(ret); 2324 goto out; 2325 } 2326 break; 2327 } 2328 2329 /* 2330 * Record the bucket we have found. 2331 * When the xattr's hash value is in the gap of 2 buckets, we will 2332 * always set it to the previous bucket. 2333 */ 2334 if (!lower_bh) { 2335 /* 2336 * We can't find any bucket whose first name_hash is less 2337 * than the find name_hash. 2338 */ 2339 BUG_ON(bh->b_blocknr != p_blkno); 2340 lower_bh = bh; 2341 bh = NULL; 2342 } 2343 xs->bucket.bhs[0] = lower_bh; 2344 xs->bucket.xh = (struct ocfs2_xattr_header *) 2345 xs->bucket.bhs[0]->b_data; 2346 lower_bh = NULL; 2347 2348 xs->header = xs->bucket.xh; 2349 xs->base = xs->bucket.bhs[0]->b_data; 2350 xs->end = xs->base + inode->i_sb->s_blocksize; 2351 2352 if (found) { 2353 /* 2354 * If we have found the xattr enty, read all the blocks in 2355 * this bucket. 2356 */ 2357 ret = ocfs2_read_blocks(inode, xs->bucket.bhs[0]->b_blocknr + 1, 2358 blk_per_bucket - 1, &xs->bucket.bhs[1], 2359 0); 2360 if (ret) { 2361 mlog_errno(ret); 2362 goto out; 2363 } 2364 2365 xs->here = &xs->header->xh_entries[index]; 2366 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name, 2367 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index); 2368 } else 2369 ret = -ENODATA; 2370 2371 out: 2372 brelse(bh); 2373 brelse(lower_bh); 2374 return ret; 2375 } 2376 2377 static int ocfs2_xattr_index_block_find(struct inode *inode, 2378 struct buffer_head *root_bh, 2379 int name_index, 2380 const char *name, 2381 struct ocfs2_xattr_search *xs) 2382 { 2383 int ret; 2384 struct ocfs2_xattr_block *xb = 2385 (struct ocfs2_xattr_block *)root_bh->b_data; 2386 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 2387 struct ocfs2_extent_list *el = &xb_root->xt_list; 2388 u64 p_blkno = 0; 2389 u32 first_hash, num_clusters = 0; 2390 u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name)); 2391 2392 if (le16_to_cpu(el->l_next_free_rec) == 0) 2393 return -ENODATA; 2394 2395 mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n", 2396 name, name_hash, name_index); 2397 2398 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash, 2399 &num_clusters, el); 2400 if (ret) { 2401 mlog_errno(ret); 2402 goto out; 2403 } 2404 2405 BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash); 2406 2407 mlog(0, "find xattr extent rec %u clusters from %llu, the first hash " 2408 "in the rec is %u\n", num_clusters, p_blkno, first_hash); 2409 2410 ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash, 2411 p_blkno, first_hash, num_clusters, xs); 2412 2413 out: 2414 return ret; 2415 } 2416 2417 static int ocfs2_iterate_xattr_buckets(struct inode *inode, 2418 u64 blkno, 2419 u32 clusters, 2420 xattr_bucket_func *func, 2421 void *para) 2422 { 2423 int i, j, ret = 0; 2424 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2425 u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)); 2426 u32 num_buckets = clusters * bpc; 2427 struct ocfs2_xattr_bucket bucket; 2428 2429 memset(&bucket, 0, sizeof(bucket)); 2430 2431 mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n", 2432 clusters, blkno); 2433 2434 for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) { 2435 ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket, 2436 bucket.bhs, 0); 2437 if (ret) { 2438 mlog_errno(ret); 2439 goto out; 2440 } 2441 2442 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data; 2443 /* 2444 * The real bucket num in this series of blocks is stored 2445 * in the 1st bucket. 2446 */ 2447 if (i == 0) 2448 num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets); 2449 2450 mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno, 2451 le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash)); 2452 if (func) { 2453 ret = func(inode, &bucket, para); 2454 if (ret) { 2455 mlog_errno(ret); 2456 break; 2457 } 2458 } 2459 2460 for (j = 0; j < blk_per_bucket; j++) 2461 brelse(bucket.bhs[j]); 2462 memset(&bucket, 0, sizeof(bucket)); 2463 } 2464 2465 out: 2466 for (j = 0; j < blk_per_bucket; j++) 2467 brelse(bucket.bhs[j]); 2468 2469 return ret; 2470 } 2471 2472 struct ocfs2_xattr_tree_list { 2473 char *buffer; 2474 size_t buffer_size; 2475 size_t result; 2476 }; 2477 2478 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, 2479 struct ocfs2_xattr_header *xh, 2480 int index, 2481 int *block_off, 2482 int *new_offset) 2483 { 2484 u16 name_offset; 2485 2486 if (index < 0 || index >= le16_to_cpu(xh->xh_count)) 2487 return -EINVAL; 2488 2489 name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset); 2490 2491 *block_off = name_offset >> inode->i_sb->s_blocksize_bits; 2492 *new_offset = name_offset % inode->i_sb->s_blocksize; 2493 2494 return 0; 2495 } 2496 2497 static int ocfs2_list_xattr_bucket(struct inode *inode, 2498 struct ocfs2_xattr_bucket *bucket, 2499 void *para) 2500 { 2501 int ret = 0, type; 2502 struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para; 2503 int i, block_off, new_offset; 2504 const char *prefix, *name; 2505 2506 for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) { 2507 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i]; 2508 type = ocfs2_xattr_get_type(entry); 2509 prefix = ocfs2_xattr_prefix(type); 2510 2511 if (prefix) { 2512 ret = ocfs2_xattr_bucket_get_name_value(inode, 2513 bucket->xh, 2514 i, 2515 &block_off, 2516 &new_offset); 2517 if (ret) 2518 break; 2519 2520 name = (const char *)bucket->bhs[block_off]->b_data + 2521 new_offset; 2522 ret = ocfs2_xattr_list_entry(xl->buffer, 2523 xl->buffer_size, 2524 &xl->result, 2525 prefix, name, 2526 entry->xe_name_len); 2527 if (ret) 2528 break; 2529 } 2530 } 2531 2532 return ret; 2533 } 2534 2535 static int ocfs2_xattr_tree_list_index_block(struct inode *inode, 2536 struct ocfs2_xattr_tree_root *xt, 2537 char *buffer, 2538 size_t buffer_size) 2539 { 2540 struct ocfs2_extent_list *el = &xt->xt_list; 2541 int ret = 0; 2542 u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0; 2543 u64 p_blkno = 0; 2544 struct ocfs2_xattr_tree_list xl = { 2545 .buffer = buffer, 2546 .buffer_size = buffer_size, 2547 .result = 0, 2548 }; 2549 2550 if (le16_to_cpu(el->l_next_free_rec) == 0) 2551 return 0; 2552 2553 while (name_hash > 0) { 2554 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 2555 &e_cpos, &num_clusters, el); 2556 if (ret) { 2557 mlog_errno(ret); 2558 goto out; 2559 } 2560 2561 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 2562 ocfs2_list_xattr_bucket, 2563 &xl); 2564 if (ret) { 2565 mlog_errno(ret); 2566 goto out; 2567 } 2568 2569 if (e_cpos == 0) 2570 break; 2571 2572 name_hash = e_cpos - 1; 2573 } 2574 2575 ret = xl.result; 2576 out: 2577 return ret; 2578 } 2579 2580 static int cmp_xe(const void *a, const void *b) 2581 { 2582 const struct ocfs2_xattr_entry *l = a, *r = b; 2583 u32 l_hash = le32_to_cpu(l->xe_name_hash); 2584 u32 r_hash = le32_to_cpu(r->xe_name_hash); 2585 2586 if (l_hash > r_hash) 2587 return 1; 2588 if (l_hash < r_hash) 2589 return -1; 2590 return 0; 2591 } 2592 2593 static void swap_xe(void *a, void *b, int size) 2594 { 2595 struct ocfs2_xattr_entry *l = a, *r = b, tmp; 2596 2597 tmp = *l; 2598 memcpy(l, r, sizeof(struct ocfs2_xattr_entry)); 2599 memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry)); 2600 } 2601 2602 /* 2603 * When the ocfs2_xattr_block is filled up, new bucket will be created 2604 * and all the xattr entries will be moved to the new bucket. 2605 * Note: we need to sort the entries since they are not saved in order 2606 * in the ocfs2_xattr_block. 2607 */ 2608 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode, 2609 struct buffer_head *xb_bh, 2610 struct buffer_head *xh_bh, 2611 struct buffer_head *data_bh) 2612 { 2613 int i, blocksize = inode->i_sb->s_blocksize; 2614 u16 offset, size, off_change; 2615 struct ocfs2_xattr_entry *xe; 2616 struct ocfs2_xattr_block *xb = 2617 (struct ocfs2_xattr_block *)xb_bh->b_data; 2618 struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header; 2619 struct ocfs2_xattr_header *xh = 2620 (struct ocfs2_xattr_header *)xh_bh->b_data; 2621 u16 count = le16_to_cpu(xb_xh->xh_count); 2622 char *target = xh_bh->b_data, *src = xb_bh->b_data; 2623 2624 mlog(0, "cp xattr from block %llu to bucket %llu\n", 2625 (unsigned long long)xb_bh->b_blocknr, 2626 (unsigned long long)xh_bh->b_blocknr); 2627 2628 memset(xh_bh->b_data, 0, blocksize); 2629 if (data_bh) 2630 memset(data_bh->b_data, 0, blocksize); 2631 /* 2632 * Since the xe_name_offset is based on ocfs2_xattr_header, 2633 * there is a offset change corresponding to the change of 2634 * ocfs2_xattr_header's position. 2635 */ 2636 off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2637 xe = &xb_xh->xh_entries[count - 1]; 2638 offset = le16_to_cpu(xe->xe_name_offset) + off_change; 2639 size = blocksize - offset; 2640 2641 /* copy all the names and values. */ 2642 if (data_bh) 2643 target = data_bh->b_data; 2644 memcpy(target + offset, src + offset, size); 2645 2646 /* Init new header now. */ 2647 xh->xh_count = xb_xh->xh_count; 2648 xh->xh_num_buckets = cpu_to_le16(1); 2649 xh->xh_name_value_len = cpu_to_le16(size); 2650 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size); 2651 2652 /* copy all the entries. */ 2653 target = xh_bh->b_data; 2654 offset = offsetof(struct ocfs2_xattr_header, xh_entries); 2655 size = count * sizeof(struct ocfs2_xattr_entry); 2656 memcpy(target + offset, (char *)xb_xh + offset, size); 2657 2658 /* Change the xe offset for all the xe because of the move. */ 2659 off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize + 2660 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); 2661 for (i = 0; i < count; i++) 2662 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change); 2663 2664 mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n", 2665 offset, size, off_change); 2666 2667 sort(target + offset, count, sizeof(struct ocfs2_xattr_entry), 2668 cmp_xe, swap_xe); 2669 } 2670 2671 /* 2672 * After we move xattr from block to index btree, we have to 2673 * update ocfs2_xattr_search to the new xe and base. 2674 * 2675 * When the entry is in xattr block, xattr_bh indicates the storage place. 2676 * While if the entry is in index b-tree, "bucket" indicates the 2677 * real place of the xattr. 2678 */ 2679 static int ocfs2_xattr_update_xattr_search(struct inode *inode, 2680 struct ocfs2_xattr_search *xs, 2681 struct buffer_head *old_bh, 2682 struct buffer_head *new_bh) 2683 { 2684 int ret = 0; 2685 char *buf = old_bh->b_data; 2686 struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf; 2687 struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header; 2688 int i, blocksize = inode->i_sb->s_blocksize; 2689 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2690 2691 xs->bucket.bhs[0] = new_bh; 2692 get_bh(new_bh); 2693 xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data; 2694 xs->header = xs->bucket.xh; 2695 2696 xs->base = new_bh->b_data; 2697 xs->end = xs->base + inode->i_sb->s_blocksize; 2698 2699 if (!xs->not_found) { 2700 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) { 2701 ret = ocfs2_read_blocks(inode, 2702 xs->bucket.bhs[0]->b_blocknr + 1, 2703 blk_per_bucket - 1, &xs->bucket.bhs[1], 2704 0); 2705 if (ret) { 2706 mlog_errno(ret); 2707 return ret; 2708 } 2709 2710 i = xs->here - old_xh->xh_entries; 2711 xs->here = &xs->header->xh_entries[i]; 2712 } 2713 } 2714 2715 return ret; 2716 } 2717 2718 static int ocfs2_xattr_create_index_block(struct inode *inode, 2719 struct ocfs2_xattr_search *xs) 2720 { 2721 int ret, credits = OCFS2_SUBALLOC_ALLOC; 2722 u32 bit_off, len; 2723 u64 blkno; 2724 handle_t *handle; 2725 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2726 struct ocfs2_inode_info *oi = OCFS2_I(inode); 2727 struct ocfs2_alloc_context *data_ac; 2728 struct buffer_head *xh_bh = NULL, *data_bh = NULL; 2729 struct buffer_head *xb_bh = xs->xattr_bh; 2730 struct ocfs2_xattr_block *xb = 2731 (struct ocfs2_xattr_block *)xb_bh->b_data; 2732 struct ocfs2_xattr_tree_root *xr; 2733 u16 xb_flags = le16_to_cpu(xb->xb_flags); 2734 u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2735 2736 mlog(0, "create xattr index block for %llu\n", 2737 (unsigned long long)xb_bh->b_blocknr); 2738 2739 BUG_ON(xb_flags & OCFS2_XATTR_INDEXED); 2740 2741 ret = ocfs2_reserve_clusters(osb, 1, &data_ac); 2742 if (ret) { 2743 mlog_errno(ret); 2744 goto out; 2745 } 2746 2747 /* 2748 * XXX: 2749 * We can use this lock for now, and maybe move to a dedicated mutex 2750 * if performance becomes a problem later. 2751 */ 2752 down_write(&oi->ip_alloc_sem); 2753 2754 /* 2755 * 3 more credits, one for xattr block update, one for the 1st block 2756 * of the new xattr bucket and one for the value/data. 2757 */ 2758 credits += 3; 2759 handle = ocfs2_start_trans(osb, credits); 2760 if (IS_ERR(handle)) { 2761 ret = PTR_ERR(handle); 2762 mlog_errno(ret); 2763 goto out_sem; 2764 } 2765 2766 ret = ocfs2_journal_access(handle, inode, xb_bh, 2767 OCFS2_JOURNAL_ACCESS_WRITE); 2768 if (ret) { 2769 mlog_errno(ret); 2770 goto out_commit; 2771 } 2772 2773 ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len); 2774 if (ret) { 2775 mlog_errno(ret); 2776 goto out_commit; 2777 } 2778 2779 /* 2780 * The bucket may spread in many blocks, and 2781 * we will only touch the 1st block and the last block 2782 * in the whole bucket(one for entry and one for data). 2783 */ 2784 blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off); 2785 2786 mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno); 2787 2788 xh_bh = sb_getblk(inode->i_sb, blkno); 2789 if (!xh_bh) { 2790 ret = -EIO; 2791 mlog_errno(ret); 2792 goto out_commit; 2793 } 2794 2795 ocfs2_set_new_buffer_uptodate(inode, xh_bh); 2796 2797 ret = ocfs2_journal_access(handle, inode, xh_bh, 2798 OCFS2_JOURNAL_ACCESS_CREATE); 2799 if (ret) { 2800 mlog_errno(ret); 2801 goto out_commit; 2802 } 2803 2804 if (bpb > 1) { 2805 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1); 2806 if (!data_bh) { 2807 ret = -EIO; 2808 mlog_errno(ret); 2809 goto out_commit; 2810 } 2811 2812 ocfs2_set_new_buffer_uptodate(inode, data_bh); 2813 2814 ret = ocfs2_journal_access(handle, inode, data_bh, 2815 OCFS2_JOURNAL_ACCESS_CREATE); 2816 if (ret) { 2817 mlog_errno(ret); 2818 goto out_commit; 2819 } 2820 } 2821 2822 ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh); 2823 2824 ocfs2_journal_dirty(handle, xh_bh); 2825 if (data_bh) 2826 ocfs2_journal_dirty(handle, data_bh); 2827 2828 ret = ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh); 2829 if (ret) { 2830 mlog_errno(ret); 2831 goto out_commit; 2832 } 2833 2834 /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */ 2835 memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - 2836 offsetof(struct ocfs2_xattr_block, xb_attrs)); 2837 2838 xr = &xb->xb_attrs.xb_root; 2839 xr->xt_clusters = cpu_to_le32(1); 2840 xr->xt_last_eb_blk = 0; 2841 xr->xt_list.l_tree_depth = 0; 2842 xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb)); 2843 xr->xt_list.l_next_free_rec = cpu_to_le16(1); 2844 2845 xr->xt_list.l_recs[0].e_cpos = 0; 2846 xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno); 2847 xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1); 2848 2849 xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED); 2850 2851 ret = ocfs2_journal_dirty(handle, xb_bh); 2852 if (ret) { 2853 mlog_errno(ret); 2854 goto out_commit; 2855 } 2856 2857 out_commit: 2858 ocfs2_commit_trans(osb, handle); 2859 2860 out_sem: 2861 up_write(&oi->ip_alloc_sem); 2862 2863 out: 2864 if (data_ac) 2865 ocfs2_free_alloc_context(data_ac); 2866 2867 brelse(xh_bh); 2868 brelse(data_bh); 2869 2870 return ret; 2871 } 2872 2873 static int cmp_xe_offset(const void *a, const void *b) 2874 { 2875 const struct ocfs2_xattr_entry *l = a, *r = b; 2876 u32 l_name_offset = le16_to_cpu(l->xe_name_offset); 2877 u32 r_name_offset = le16_to_cpu(r->xe_name_offset); 2878 2879 if (l_name_offset < r_name_offset) 2880 return 1; 2881 if (l_name_offset > r_name_offset) 2882 return -1; 2883 return 0; 2884 } 2885 2886 /* 2887 * defrag a xattr bucket if we find that the bucket has some 2888 * holes beteen name/value pairs. 2889 * We will move all the name/value pairs to the end of the bucket 2890 * so that we can spare some space for insertion. 2891 */ 2892 static int ocfs2_defrag_xattr_bucket(struct inode *inode, 2893 struct ocfs2_xattr_bucket *bucket) 2894 { 2895 int ret, i; 2896 size_t end, offset, len, value_len; 2897 struct ocfs2_xattr_header *xh; 2898 char *entries, *buf, *bucket_buf = NULL; 2899 u64 blkno = bucket->bhs[0]->b_blocknr; 2900 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 2901 u16 xh_free_start; 2902 size_t blocksize = inode->i_sb->s_blocksize; 2903 handle_t *handle; 2904 struct buffer_head **bhs; 2905 struct ocfs2_xattr_entry *xe; 2906 2907 bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 2908 GFP_NOFS); 2909 if (!bhs) 2910 return -ENOMEM; 2911 2912 ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket, bhs, 0); 2913 if (ret) 2914 goto out; 2915 2916 /* 2917 * In order to make the operation more efficient and generic, 2918 * we copy all the blocks into a contiguous memory and do the 2919 * defragment there, so if anything is error, we will not touch 2920 * the real block. 2921 */ 2922 bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS); 2923 if (!bucket_buf) { 2924 ret = -EIO; 2925 goto out; 2926 } 2927 2928 buf = bucket_buf; 2929 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) 2930 memcpy(buf, bhs[i]->b_data, blocksize); 2931 2932 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket); 2933 if (IS_ERR(handle)) { 2934 ret = PTR_ERR(handle); 2935 handle = NULL; 2936 mlog_errno(ret); 2937 goto out; 2938 } 2939 2940 for (i = 0; i < blk_per_bucket; i++) { 2941 ret = ocfs2_journal_access(handle, inode, bhs[i], 2942 OCFS2_JOURNAL_ACCESS_WRITE); 2943 if (ret < 0) { 2944 mlog_errno(ret); 2945 goto commit; 2946 } 2947 } 2948 2949 xh = (struct ocfs2_xattr_header *)bucket_buf; 2950 entries = (char *)xh->xh_entries; 2951 xh_free_start = le16_to_cpu(xh->xh_free_start); 2952 2953 mlog(0, "adjust xattr bucket in %llu, count = %u, " 2954 "xh_free_start = %u, xh_name_value_len = %u.\n", 2955 blkno, le16_to_cpu(xh->xh_count), xh_free_start, 2956 le16_to_cpu(xh->xh_name_value_len)); 2957 2958 /* 2959 * sort all the entries by their offset. 2960 * the largest will be the first, so that we can 2961 * move them to the end one by one. 2962 */ 2963 sort(entries, le16_to_cpu(xh->xh_count), 2964 sizeof(struct ocfs2_xattr_entry), 2965 cmp_xe_offset, swap_xe); 2966 2967 /* Move all name/values to the end of the bucket. */ 2968 xe = xh->xh_entries; 2969 end = OCFS2_XATTR_BUCKET_SIZE; 2970 for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) { 2971 offset = le16_to_cpu(xe->xe_name_offset); 2972 if (ocfs2_xattr_is_local(xe)) 2973 value_len = OCFS2_XATTR_SIZE( 2974 le64_to_cpu(xe->xe_value_size)); 2975 else 2976 value_len = OCFS2_XATTR_ROOT_SIZE; 2977 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len; 2978 2979 /* 2980 * We must make sure that the name/value pair 2981 * exist in the same block. So adjust end to 2982 * the previous block end if needed. 2983 */ 2984 if (((end - len) / blocksize != 2985 (end - 1) / blocksize)) 2986 end = end - end % blocksize; 2987 2988 if (end > offset + len) { 2989 memmove(bucket_buf + end - len, 2990 bucket_buf + offset, len); 2991 xe->xe_name_offset = cpu_to_le16(end - len); 2992 } 2993 2994 mlog_bug_on_msg(end < offset + len, "Defrag check failed for " 2995 "bucket %llu\n", (unsigned long long)blkno); 2996 2997 end -= len; 2998 } 2999 3000 mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for " 3001 "bucket %llu\n", (unsigned long long)blkno); 3002 3003 if (xh_free_start == end) 3004 goto commit; 3005 3006 memset(bucket_buf + xh_free_start, 0, end - xh_free_start); 3007 xh->xh_free_start = cpu_to_le16(end); 3008 3009 /* sort the entries by their name_hash. */ 3010 sort(entries, le16_to_cpu(xh->xh_count), 3011 sizeof(struct ocfs2_xattr_entry), 3012 cmp_xe, swap_xe); 3013 3014 buf = bucket_buf; 3015 for (i = 0; i < blk_per_bucket; i++, buf += blocksize) { 3016 memcpy(bhs[i]->b_data, buf, blocksize); 3017 ocfs2_journal_dirty(handle, bhs[i]); 3018 } 3019 3020 commit: 3021 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 3022 out: 3023 3024 if (bhs) { 3025 for (i = 0; i < blk_per_bucket; i++) 3026 brelse(bhs[i]); 3027 } 3028 kfree(bhs); 3029 3030 kfree(bucket_buf); 3031 return ret; 3032 } 3033 3034 /* 3035 * Move half nums of the xattr bucket in the previous cluster to this new 3036 * cluster. We only touch the last cluster of the previous extend record. 3037 * 3038 * first_bh is the first buffer_head of a series of bucket in the same 3039 * extent rec and header_bh is the header of one bucket in this cluster. 3040 * They will be updated if we move the data header_bh contains to the new 3041 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster. 3042 */ 3043 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode, 3044 handle_t *handle, 3045 struct buffer_head **first_bh, 3046 struct buffer_head **header_bh, 3047 u64 new_blkno, 3048 u64 prev_blkno, 3049 u32 num_clusters, 3050 u32 *first_hash) 3051 { 3052 int i, ret, credits; 3053 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3054 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3055 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3056 int blocksize = inode->i_sb->s_blocksize; 3057 struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL; 3058 struct ocfs2_xattr_header *new_xh; 3059 struct ocfs2_xattr_header *xh = 3060 (struct ocfs2_xattr_header *)((*first_bh)->b_data); 3061 3062 BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets); 3063 BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize); 3064 3065 prev_bh = *first_bh; 3066 get_bh(prev_bh); 3067 xh = (struct ocfs2_xattr_header *)prev_bh->b_data; 3068 3069 prev_blkno += (num_clusters - 1) * bpc + bpc / 2; 3070 3071 mlog(0, "move half of xattrs in cluster %llu to %llu\n", 3072 prev_blkno, new_blkno); 3073 3074 /* 3075 * We need to update the 1st half of the new cluster and 3076 * 1 more for the update of the 1st bucket of the previous 3077 * extent record. 3078 */ 3079 credits = bpc / 2 + 1; 3080 ret = ocfs2_extend_trans(handle, credits); 3081 if (ret) { 3082 mlog_errno(ret); 3083 goto out; 3084 } 3085 3086 ret = ocfs2_journal_access(handle, inode, prev_bh, 3087 OCFS2_JOURNAL_ACCESS_WRITE); 3088 if (ret) { 3089 mlog_errno(ret); 3090 goto out; 3091 } 3092 3093 for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) { 3094 old_bh = new_bh = NULL; 3095 new_bh = sb_getblk(inode->i_sb, new_blkno); 3096 if (!new_bh) { 3097 ret = -EIO; 3098 mlog_errno(ret); 3099 goto out; 3100 } 3101 3102 ocfs2_set_new_buffer_uptodate(inode, new_bh); 3103 3104 ret = ocfs2_journal_access(handle, inode, new_bh, 3105 OCFS2_JOURNAL_ACCESS_CREATE); 3106 if (ret < 0) { 3107 mlog_errno(ret); 3108 brelse(new_bh); 3109 goto out; 3110 } 3111 3112 ret = ocfs2_read_block(inode, prev_blkno, &old_bh); 3113 if (ret < 0) { 3114 mlog_errno(ret); 3115 brelse(new_bh); 3116 goto out; 3117 } 3118 3119 memcpy(new_bh->b_data, old_bh->b_data, blocksize); 3120 3121 if (i == 0) { 3122 new_xh = (struct ocfs2_xattr_header *)new_bh->b_data; 3123 new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2); 3124 3125 if (first_hash) 3126 *first_hash = le32_to_cpu( 3127 new_xh->xh_entries[0].xe_name_hash); 3128 new_first_bh = new_bh; 3129 get_bh(new_first_bh); 3130 } 3131 3132 ocfs2_journal_dirty(handle, new_bh); 3133 3134 if (*header_bh == old_bh) { 3135 brelse(*header_bh); 3136 *header_bh = new_bh; 3137 get_bh(*header_bh); 3138 3139 brelse(*first_bh); 3140 *first_bh = new_first_bh; 3141 get_bh(*first_bh); 3142 } 3143 brelse(new_bh); 3144 brelse(old_bh); 3145 } 3146 3147 le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2)); 3148 3149 ocfs2_journal_dirty(handle, prev_bh); 3150 out: 3151 brelse(prev_bh); 3152 brelse(new_first_bh); 3153 return ret; 3154 } 3155 3156 static int ocfs2_read_xattr_bucket(struct inode *inode, 3157 u64 blkno, 3158 struct buffer_head **bhs, 3159 int new) 3160 { 3161 int ret = 0; 3162 u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3163 3164 if (!new) 3165 return ocfs2_read_blocks(inode, blkno, 3166 blk_per_bucket, bhs, 0); 3167 3168 for (i = 0; i < blk_per_bucket; i++) { 3169 bhs[i] = sb_getblk(inode->i_sb, blkno + i); 3170 if (bhs[i] == NULL) { 3171 ret = -EIO; 3172 mlog_errno(ret); 3173 break; 3174 } 3175 ocfs2_set_new_buffer_uptodate(inode, bhs[i]); 3176 } 3177 3178 return ret; 3179 } 3180 3181 /* 3182 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk). 3183 * first_hash will record the 1st hash of the new bucket. 3184 */ 3185 static int ocfs2_half_xattr_bucket(struct inode *inode, 3186 handle_t *handle, 3187 u64 blk, 3188 u64 new_blk, 3189 u32 *first_hash, 3190 int new_bucket_head) 3191 { 3192 int ret, i; 3193 u16 count, start, len, name_value_len, xe_len, name_offset; 3194 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3195 struct buffer_head **s_bhs, **t_bhs = NULL; 3196 struct ocfs2_xattr_header *xh; 3197 struct ocfs2_xattr_entry *xe; 3198 int blocksize = inode->i_sb->s_blocksize; 3199 3200 mlog(0, "move half of xattrs from bucket %llu to %llu\n", 3201 blk, new_blk); 3202 3203 s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3204 if (!s_bhs) 3205 return -ENOMEM; 3206 3207 ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0); 3208 if (ret) { 3209 mlog_errno(ret); 3210 goto out; 3211 } 3212 3213 ret = ocfs2_journal_access(handle, inode, s_bhs[0], 3214 OCFS2_JOURNAL_ACCESS_WRITE); 3215 if (ret) { 3216 mlog_errno(ret); 3217 goto out; 3218 } 3219 3220 t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS); 3221 if (!t_bhs) { 3222 ret = -ENOMEM; 3223 goto out; 3224 } 3225 3226 ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head); 3227 if (ret) { 3228 mlog_errno(ret); 3229 goto out; 3230 } 3231 3232 for (i = 0; i < blk_per_bucket; i++) { 3233 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3234 OCFS2_JOURNAL_ACCESS_CREATE); 3235 if (ret) { 3236 mlog_errno(ret); 3237 goto out; 3238 } 3239 } 3240 3241 /* copy the whole bucket to the new first. */ 3242 for (i = 0; i < blk_per_bucket; i++) 3243 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3244 3245 /* update the new bucket. */ 3246 xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data; 3247 count = le16_to_cpu(xh->xh_count); 3248 start = count / 2; 3249 3250 /* 3251 * Calculate the total name/value len and xh_free_start for 3252 * the old bucket first. 3253 */ 3254 name_offset = OCFS2_XATTR_BUCKET_SIZE; 3255 name_value_len = 0; 3256 for (i = 0; i < start; i++) { 3257 xe = &xh->xh_entries[i]; 3258 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3259 if (ocfs2_xattr_is_local(xe)) 3260 xe_len += 3261 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3262 else 3263 xe_len += OCFS2_XATTR_ROOT_SIZE; 3264 name_value_len += xe_len; 3265 if (le16_to_cpu(xe->xe_name_offset) < name_offset) 3266 name_offset = le16_to_cpu(xe->xe_name_offset); 3267 } 3268 3269 /* 3270 * Now begin the modification to the new bucket. 3271 * 3272 * In the new bucket, We just move the xattr entry to the beginning 3273 * and don't touch the name/value. So there will be some holes in the 3274 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is 3275 * called. 3276 */ 3277 xe = &xh->xh_entries[start]; 3278 len = sizeof(struct ocfs2_xattr_entry) * (count - start); 3279 mlog(0, "mv xattr entry len %d from %d to %d\n", len, 3280 (int)((char *)xe - (char *)xh), 3281 (int)((char *)xh->xh_entries - (char *)xh)); 3282 memmove((char *)xh->xh_entries, (char *)xe, len); 3283 xe = &xh->xh_entries[count - start]; 3284 len = sizeof(struct ocfs2_xattr_entry) * start; 3285 memset((char *)xe, 0, len); 3286 3287 le16_add_cpu(&xh->xh_count, -start); 3288 le16_add_cpu(&xh->xh_name_value_len, -name_value_len); 3289 3290 /* Calculate xh_free_start for the new bucket. */ 3291 xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); 3292 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 3293 xe = &xh->xh_entries[i]; 3294 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); 3295 if (ocfs2_xattr_is_local(xe)) 3296 xe_len += 3297 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3298 else 3299 xe_len += OCFS2_XATTR_ROOT_SIZE; 3300 if (le16_to_cpu(xe->xe_name_offset) < 3301 le16_to_cpu(xh->xh_free_start)) 3302 xh->xh_free_start = xe->xe_name_offset; 3303 } 3304 3305 /* set xh->xh_num_buckets for the new xh. */ 3306 if (new_bucket_head) 3307 xh->xh_num_buckets = cpu_to_le16(1); 3308 else 3309 xh->xh_num_buckets = 0; 3310 3311 for (i = 0; i < blk_per_bucket; i++) { 3312 ocfs2_journal_dirty(handle, t_bhs[i]); 3313 if (ret) 3314 mlog_errno(ret); 3315 } 3316 3317 /* store the first_hash of the new bucket. */ 3318 if (first_hash) 3319 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3320 3321 /* 3322 * Now only update the 1st block of the old bucket. 3323 * Please note that the entry has been sorted already above. 3324 */ 3325 xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data; 3326 memset(&xh->xh_entries[start], 0, 3327 sizeof(struct ocfs2_xattr_entry) * (count - start)); 3328 xh->xh_count = cpu_to_le16(start); 3329 xh->xh_free_start = cpu_to_le16(name_offset); 3330 xh->xh_name_value_len = cpu_to_le16(name_value_len); 3331 3332 ocfs2_journal_dirty(handle, s_bhs[0]); 3333 if (ret) 3334 mlog_errno(ret); 3335 3336 out: 3337 if (s_bhs) { 3338 for (i = 0; i < blk_per_bucket; i++) 3339 brelse(s_bhs[i]); 3340 } 3341 kfree(s_bhs); 3342 3343 if (t_bhs) { 3344 for (i = 0; i < blk_per_bucket; i++) 3345 brelse(t_bhs[i]); 3346 } 3347 kfree(t_bhs); 3348 3349 return ret; 3350 } 3351 3352 /* 3353 * Copy xattr from one bucket to another bucket. 3354 * 3355 * The caller must make sure that the journal transaction 3356 * has enough space for journaling. 3357 */ 3358 static int ocfs2_cp_xattr_bucket(struct inode *inode, 3359 handle_t *handle, 3360 u64 s_blkno, 3361 u64 t_blkno, 3362 int t_is_new) 3363 { 3364 int ret, i; 3365 int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3366 int blocksize = inode->i_sb->s_blocksize; 3367 struct buffer_head **s_bhs, **t_bhs = NULL; 3368 3369 BUG_ON(s_blkno == t_blkno); 3370 3371 mlog(0, "cp bucket %llu to %llu, target is %d\n", 3372 s_blkno, t_blkno, t_is_new); 3373 3374 s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3375 GFP_NOFS); 3376 if (!s_bhs) 3377 return -ENOMEM; 3378 3379 ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0); 3380 if (ret) 3381 goto out; 3382 3383 t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, 3384 GFP_NOFS); 3385 if (!t_bhs) { 3386 ret = -ENOMEM; 3387 goto out; 3388 } 3389 3390 ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new); 3391 if (ret) 3392 goto out; 3393 3394 for (i = 0; i < blk_per_bucket; i++) { 3395 ret = ocfs2_journal_access(handle, inode, t_bhs[i], 3396 OCFS2_JOURNAL_ACCESS_WRITE); 3397 if (ret) 3398 goto out; 3399 } 3400 3401 for (i = 0; i < blk_per_bucket; i++) { 3402 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize); 3403 ocfs2_journal_dirty(handle, t_bhs[i]); 3404 } 3405 3406 out: 3407 if (s_bhs) { 3408 for (i = 0; i < blk_per_bucket; i++) 3409 brelse(s_bhs[i]); 3410 } 3411 kfree(s_bhs); 3412 3413 if (t_bhs) { 3414 for (i = 0; i < blk_per_bucket; i++) 3415 brelse(t_bhs[i]); 3416 } 3417 kfree(t_bhs); 3418 3419 return ret; 3420 } 3421 3422 /* 3423 * Copy one xattr cluster from src_blk to to_blk. 3424 * The to_blk will become the first bucket header of the cluster, so its 3425 * xh_num_buckets will be initialized as the bucket num in the cluster. 3426 */ 3427 static int ocfs2_cp_xattr_cluster(struct inode *inode, 3428 handle_t *handle, 3429 struct buffer_head *first_bh, 3430 u64 src_blk, 3431 u64 to_blk, 3432 u32 *first_hash) 3433 { 3434 int i, ret, credits; 3435 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3436 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3437 int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); 3438 struct buffer_head *bh = NULL; 3439 struct ocfs2_xattr_header *xh; 3440 u64 to_blk_start = to_blk; 3441 3442 mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk); 3443 3444 /* 3445 * We need to update the new cluster and 1 more for the update of 3446 * the 1st bucket of the previous extent rec. 3447 */ 3448 credits = bpc + 1; 3449 ret = ocfs2_extend_trans(handle, credits); 3450 if (ret) { 3451 mlog_errno(ret); 3452 goto out; 3453 } 3454 3455 ret = ocfs2_journal_access(handle, inode, first_bh, 3456 OCFS2_JOURNAL_ACCESS_WRITE); 3457 if (ret) { 3458 mlog_errno(ret); 3459 goto out; 3460 } 3461 3462 for (i = 0; i < num_buckets; i++) { 3463 ret = ocfs2_cp_xattr_bucket(inode, handle, 3464 src_blk, to_blk, 1); 3465 if (ret) { 3466 mlog_errno(ret); 3467 goto out; 3468 } 3469 3470 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3471 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3472 } 3473 3474 /* update the old bucket header. */ 3475 xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3476 le16_add_cpu(&xh->xh_num_buckets, -num_buckets); 3477 3478 ocfs2_journal_dirty(handle, first_bh); 3479 3480 /* update the new bucket header. */ 3481 ret = ocfs2_read_block(inode, to_blk_start, &bh); 3482 if (ret < 0) { 3483 mlog_errno(ret); 3484 goto out; 3485 } 3486 3487 ret = ocfs2_journal_access(handle, inode, bh, 3488 OCFS2_JOURNAL_ACCESS_WRITE); 3489 if (ret) { 3490 mlog_errno(ret); 3491 goto out; 3492 } 3493 3494 xh = (struct ocfs2_xattr_header *)bh->b_data; 3495 xh->xh_num_buckets = cpu_to_le16(num_buckets); 3496 3497 ocfs2_journal_dirty(handle, bh); 3498 3499 if (first_hash) 3500 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3501 out: 3502 brelse(bh); 3503 return ret; 3504 } 3505 3506 /* 3507 * Move half of the xattrs in this cluster to the new cluster. 3508 * This function should only be called when bucket size == cluster size. 3509 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead. 3510 */ 3511 static int ocfs2_half_xattr_cluster(struct inode *inode, 3512 handle_t *handle, 3513 u64 prev_blk, 3514 u64 new_blk, 3515 u32 *first_hash) 3516 { 3517 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3518 int ret, credits = 2 * blk_per_bucket; 3519 3520 BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize); 3521 3522 ret = ocfs2_extend_trans(handle, credits); 3523 if (ret) { 3524 mlog_errno(ret); 3525 return ret; 3526 } 3527 3528 /* Move half of the xattr in start_blk to the next bucket. */ 3529 return ocfs2_half_xattr_bucket(inode, handle, prev_blk, 3530 new_blk, first_hash, 1); 3531 } 3532 3533 /* 3534 * Move some xattrs from the old cluster to the new one since they are not 3535 * contiguous in ocfs2 xattr tree. 3536 * 3537 * new_blk starts a new separate cluster, and we will move some xattrs from 3538 * prev_blk to it. v_start will be set as the first name hash value in this 3539 * new cluster so that it can be used as e_cpos during tree insertion and 3540 * don't collide with our original b-tree operations. first_bh and header_bh 3541 * will also be updated since they will be used in ocfs2_extend_xattr_bucket 3542 * to extend the insert bucket. 3543 * 3544 * The problem is how much xattr should we move to the new one and when should 3545 * we update first_bh and header_bh? 3546 * 1. If cluster size > bucket size, that means the previous cluster has more 3547 * than 1 bucket, so just move half nums of bucket into the new cluster and 3548 * update the first_bh and header_bh if the insert bucket has been moved 3549 * to the new cluster. 3550 * 2. If cluster_size == bucket_size: 3551 * a) If the previous extent rec has more than one cluster and the insert 3552 * place isn't in the last cluster, copy the entire last cluster to the 3553 * new one. This time, we don't need to upate the first_bh and header_bh 3554 * since they will not be moved into the new cluster. 3555 * b) Otherwise, move the bottom half of the xattrs in the last cluster into 3556 * the new one. And we set the extend flag to zero if the insert place is 3557 * moved into the new allocated cluster since no extend is needed. 3558 */ 3559 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode, 3560 handle_t *handle, 3561 struct buffer_head **first_bh, 3562 struct buffer_head **header_bh, 3563 u64 new_blk, 3564 u64 prev_blk, 3565 u32 prev_clusters, 3566 u32 *v_start, 3567 int *extend) 3568 { 3569 int ret = 0; 3570 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3571 3572 mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n", 3573 prev_blk, prev_clusters, new_blk); 3574 3575 if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) 3576 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode, 3577 handle, 3578 first_bh, 3579 header_bh, 3580 new_blk, 3581 prev_blk, 3582 prev_clusters, 3583 v_start); 3584 else { 3585 u64 last_blk = prev_blk + bpc * (prev_clusters - 1); 3586 3587 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk) 3588 ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh, 3589 last_blk, new_blk, 3590 v_start); 3591 else { 3592 ret = ocfs2_half_xattr_cluster(inode, handle, 3593 last_blk, new_blk, 3594 v_start); 3595 3596 if ((*header_bh)->b_blocknr == last_blk && extend) 3597 *extend = 0; 3598 } 3599 } 3600 3601 return ret; 3602 } 3603 3604 /* 3605 * Add a new cluster for xattr storage. 3606 * 3607 * If the new cluster is contiguous with the previous one, it will be 3608 * appended to the same extent record, and num_clusters will be updated. 3609 * If not, we will insert a new extent for it and move some xattrs in 3610 * the last cluster into the new allocated one. 3611 * We also need to limit the maximum size of a btree leaf, otherwise we'll 3612 * lose the benefits of hashing because we'll have to search large leaves. 3613 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize, 3614 * if it's bigger). 3615 * 3616 * first_bh is the first block of the previous extent rec and header_bh 3617 * indicates the bucket we will insert the new xattrs. They will be updated 3618 * when the header_bh is moved into the new cluster. 3619 */ 3620 static int ocfs2_add_new_xattr_cluster(struct inode *inode, 3621 struct buffer_head *root_bh, 3622 struct buffer_head **first_bh, 3623 struct buffer_head **header_bh, 3624 u32 *num_clusters, 3625 u32 prev_cpos, 3626 u64 prev_blkno, 3627 int *extend) 3628 { 3629 int ret, credits; 3630 u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); 3631 u32 prev_clusters = *num_clusters; 3632 u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0; 3633 u64 block; 3634 handle_t *handle = NULL; 3635 struct ocfs2_alloc_context *data_ac = NULL; 3636 struct ocfs2_alloc_context *meta_ac = NULL; 3637 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3638 struct ocfs2_extent_tree et; 3639 3640 mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, " 3641 "previous xattr blkno = %llu\n", 3642 (unsigned long long)OCFS2_I(inode)->ip_blkno, 3643 prev_cpos, prev_blkno); 3644 3645 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh); 3646 3647 ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, 3648 &data_ac, &meta_ac); 3649 if (ret) { 3650 mlog_errno(ret); 3651 goto leave; 3652 } 3653 3654 credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el, 3655 clusters_to_add); 3656 handle = ocfs2_start_trans(osb, credits); 3657 if (IS_ERR(handle)) { 3658 ret = PTR_ERR(handle); 3659 handle = NULL; 3660 mlog_errno(ret); 3661 goto leave; 3662 } 3663 3664 ret = ocfs2_journal_access(handle, inode, root_bh, 3665 OCFS2_JOURNAL_ACCESS_WRITE); 3666 if (ret < 0) { 3667 mlog_errno(ret); 3668 goto leave; 3669 } 3670 3671 ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1, 3672 clusters_to_add, &bit_off, &num_bits); 3673 if (ret < 0) { 3674 if (ret != -ENOSPC) 3675 mlog_errno(ret); 3676 goto leave; 3677 } 3678 3679 BUG_ON(num_bits > clusters_to_add); 3680 3681 block = ocfs2_clusters_to_blocks(osb->sb, bit_off); 3682 mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n", 3683 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); 3684 3685 if (prev_blkno + prev_clusters * bpc == block && 3686 (prev_clusters + num_bits) << osb->s_clustersize_bits <= 3687 OCFS2_MAX_XATTR_TREE_LEAF_SIZE) { 3688 /* 3689 * If this cluster is contiguous with the old one and 3690 * adding this new cluster, we don't surpass the limit of 3691 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be 3692 * initialized and used like other buckets in the previous 3693 * cluster. 3694 * So add it as a contiguous one. The caller will handle 3695 * its init process. 3696 */ 3697 v_start = prev_cpos + prev_clusters; 3698 *num_clusters = prev_clusters + num_bits; 3699 mlog(0, "Add contiguous %u clusters to previous extent rec.\n", 3700 num_bits); 3701 } else { 3702 ret = ocfs2_adjust_xattr_cross_cluster(inode, 3703 handle, 3704 first_bh, 3705 header_bh, 3706 block, 3707 prev_blkno, 3708 prev_clusters, 3709 &v_start, 3710 extend); 3711 if (ret) { 3712 mlog_errno(ret); 3713 goto leave; 3714 } 3715 } 3716 3717 if (handle->h_buffer_credits < credits) { 3718 /* 3719 * The journal has been restarted before, and don't 3720 * have enough space for the insertion, so extend it 3721 * here. 3722 */ 3723 ret = ocfs2_extend_trans(handle, credits); 3724 if (ret) { 3725 mlog_errno(ret); 3726 goto leave; 3727 } 3728 } 3729 mlog(0, "Insert %u clusters at block %llu for xattr at %u\n", 3730 num_bits, block, v_start); 3731 ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block, 3732 num_bits, 0, meta_ac); 3733 if (ret < 0) { 3734 mlog_errno(ret); 3735 goto leave; 3736 } 3737 3738 ret = ocfs2_journal_dirty(handle, root_bh); 3739 if (ret < 0) { 3740 mlog_errno(ret); 3741 goto leave; 3742 } 3743 3744 leave: 3745 if (handle) 3746 ocfs2_commit_trans(osb, handle); 3747 if (data_ac) 3748 ocfs2_free_alloc_context(data_ac); 3749 if (meta_ac) 3750 ocfs2_free_alloc_context(meta_ac); 3751 3752 return ret; 3753 } 3754 3755 /* 3756 * Extend a new xattr bucket and move xattrs to the end one by one until 3757 * We meet with start_bh. Only move half of the xattrs to the bucket after it. 3758 */ 3759 static int ocfs2_extend_xattr_bucket(struct inode *inode, 3760 struct buffer_head *first_bh, 3761 struct buffer_head *start_bh, 3762 u32 num_clusters) 3763 { 3764 int ret, credits; 3765 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 3766 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 3767 u64 start_blk = start_bh->b_blocknr, end_blk; 3768 u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb); 3769 handle_t *handle; 3770 struct ocfs2_xattr_header *first_xh = 3771 (struct ocfs2_xattr_header *)first_bh->b_data; 3772 u16 bucket = le16_to_cpu(first_xh->xh_num_buckets); 3773 3774 mlog(0, "extend xattr bucket in %llu, xattr extend rec starting " 3775 "from %llu, len = %u\n", start_blk, 3776 (unsigned long long)first_bh->b_blocknr, num_clusters); 3777 3778 BUG_ON(bucket >= num_buckets); 3779 3780 end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket; 3781 3782 /* 3783 * We will touch all the buckets after the start_bh(include it). 3784 * Add one more bucket and modify the first_bh. 3785 */ 3786 credits = end_blk - start_blk + 2 * blk_per_bucket + 1; 3787 handle = ocfs2_start_trans(osb, credits); 3788 if (IS_ERR(handle)) { 3789 ret = PTR_ERR(handle); 3790 handle = NULL; 3791 mlog_errno(ret); 3792 goto out; 3793 } 3794 3795 ret = ocfs2_journal_access(handle, inode, first_bh, 3796 OCFS2_JOURNAL_ACCESS_WRITE); 3797 if (ret) { 3798 mlog_errno(ret); 3799 goto commit; 3800 } 3801 3802 while (end_blk != start_blk) { 3803 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk, 3804 end_blk + blk_per_bucket, 0); 3805 if (ret) 3806 goto commit; 3807 end_blk -= blk_per_bucket; 3808 } 3809 3810 /* Move half of the xattr in start_blk to the next bucket. */ 3811 ret = ocfs2_half_xattr_bucket(inode, handle, start_blk, 3812 start_blk + blk_per_bucket, NULL, 0); 3813 3814 le16_add_cpu(&first_xh->xh_num_buckets, 1); 3815 ocfs2_journal_dirty(handle, first_bh); 3816 3817 commit: 3818 ocfs2_commit_trans(osb, handle); 3819 out: 3820 return ret; 3821 } 3822 3823 /* 3824 * Add new xattr bucket in an extent record and adjust the buckets accordingly. 3825 * xb_bh is the ocfs2_xattr_block. 3826 * We will move all the buckets starting from header_bh to the next place. As 3827 * for this one, half num of its xattrs will be moved to the next one. 3828 * 3829 * We will allocate a new cluster if current cluster is full and adjust 3830 * header_bh and first_bh if the insert place is moved to the new cluster. 3831 */ 3832 static int ocfs2_add_new_xattr_bucket(struct inode *inode, 3833 struct buffer_head *xb_bh, 3834 struct buffer_head *header_bh) 3835 { 3836 struct ocfs2_xattr_header *first_xh = NULL; 3837 struct buffer_head *first_bh = NULL; 3838 struct ocfs2_xattr_block *xb = 3839 (struct ocfs2_xattr_block *)xb_bh->b_data; 3840 struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; 3841 struct ocfs2_extent_list *el = &xb_root->xt_list; 3842 struct ocfs2_xattr_header *xh = 3843 (struct ocfs2_xattr_header *)header_bh->b_data; 3844 u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); 3845 struct super_block *sb = inode->i_sb; 3846 struct ocfs2_super *osb = OCFS2_SB(sb); 3847 int ret, num_buckets, extend = 1; 3848 u64 p_blkno; 3849 u32 e_cpos, num_clusters; 3850 3851 mlog(0, "Add new xattr bucket starting form %llu\n", 3852 (unsigned long long)header_bh->b_blocknr); 3853 3854 /* 3855 * Add refrence for header_bh here because it may be 3856 * changed in ocfs2_add_new_xattr_cluster and we need 3857 * to free it in the end. 3858 */ 3859 get_bh(header_bh); 3860 3861 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos, 3862 &num_clusters, el); 3863 if (ret) { 3864 mlog_errno(ret); 3865 goto out; 3866 } 3867 3868 ret = ocfs2_read_block(inode, p_blkno, &first_bh); 3869 if (ret) { 3870 mlog_errno(ret); 3871 goto out; 3872 } 3873 3874 num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters; 3875 first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; 3876 3877 if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) { 3878 ret = ocfs2_add_new_xattr_cluster(inode, 3879 xb_bh, 3880 &first_bh, 3881 &header_bh, 3882 &num_clusters, 3883 e_cpos, 3884 p_blkno, 3885 &extend); 3886 if (ret) { 3887 mlog_errno(ret); 3888 goto out; 3889 } 3890 } 3891 3892 if (extend) 3893 ret = ocfs2_extend_xattr_bucket(inode, 3894 first_bh, 3895 header_bh, 3896 num_clusters); 3897 if (ret) 3898 mlog_errno(ret); 3899 out: 3900 brelse(first_bh); 3901 brelse(header_bh); 3902 return ret; 3903 } 3904 3905 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode, 3906 struct ocfs2_xattr_bucket *bucket, 3907 int offs) 3908 { 3909 int block_off = offs >> inode->i_sb->s_blocksize_bits; 3910 3911 offs = offs % inode->i_sb->s_blocksize; 3912 return bucket->bhs[block_off]->b_data + offs; 3913 } 3914 3915 /* 3916 * Handle the normal xattr set, including replace, delete and new. 3917 * 3918 * Note: "local" indicates the real data's locality. So we can't 3919 * just its bucket locality by its length. 3920 */ 3921 static void ocfs2_xattr_set_entry_normal(struct inode *inode, 3922 struct ocfs2_xattr_info *xi, 3923 struct ocfs2_xattr_search *xs, 3924 u32 name_hash, 3925 int local) 3926 { 3927 struct ocfs2_xattr_entry *last, *xe; 3928 int name_len = strlen(xi->name); 3929 struct ocfs2_xattr_header *xh = xs->header; 3930 u16 count = le16_to_cpu(xh->xh_count), start; 3931 size_t blocksize = inode->i_sb->s_blocksize; 3932 char *val; 3933 size_t offs, size, new_size; 3934 3935 last = &xh->xh_entries[count]; 3936 if (!xs->not_found) { 3937 xe = xs->here; 3938 offs = le16_to_cpu(xe->xe_name_offset); 3939 if (ocfs2_xattr_is_local(xe)) 3940 size = OCFS2_XATTR_SIZE(name_len) + 3941 OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 3942 else 3943 size = OCFS2_XATTR_SIZE(name_len) + 3944 OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 3945 3946 /* 3947 * If the new value will be stored outside, xi->value has been 3948 * initalized as an empty ocfs2_xattr_value_root, and the same 3949 * goes with xi->value_len, so we can set new_size safely here. 3950 * See ocfs2_xattr_set_in_bucket. 3951 */ 3952 new_size = OCFS2_XATTR_SIZE(name_len) + 3953 OCFS2_XATTR_SIZE(xi->value_len); 3954 3955 le16_add_cpu(&xh->xh_name_value_len, -size); 3956 if (xi->value) { 3957 if (new_size > size) 3958 goto set_new_name_value; 3959 3960 /* Now replace the old value with new one. */ 3961 if (local) 3962 xe->xe_value_size = cpu_to_le64(xi->value_len); 3963 else 3964 xe->xe_value_size = 0; 3965 3966 val = ocfs2_xattr_bucket_get_val(inode, 3967 &xs->bucket, offs); 3968 memset(val + OCFS2_XATTR_SIZE(name_len), 0, 3969 size - OCFS2_XATTR_SIZE(name_len)); 3970 if (OCFS2_XATTR_SIZE(xi->value_len) > 0) 3971 memcpy(val + OCFS2_XATTR_SIZE(name_len), 3972 xi->value, xi->value_len); 3973 3974 le16_add_cpu(&xh->xh_name_value_len, new_size); 3975 ocfs2_xattr_set_local(xe, local); 3976 return; 3977 } else { 3978 /* 3979 * Remove the old entry if there is more than one. 3980 * We don't remove the last entry so that we can 3981 * use it to indicate the hash value of the empty 3982 * bucket. 3983 */ 3984 last -= 1; 3985 le16_add_cpu(&xh->xh_count, -1); 3986 if (xh->xh_count) { 3987 memmove(xe, xe + 1, 3988 (void *)last - (void *)xe); 3989 memset(last, 0, 3990 sizeof(struct ocfs2_xattr_entry)); 3991 } else 3992 xh->xh_free_start = 3993 cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); 3994 3995 return; 3996 } 3997 } else { 3998 /* find a new entry for insert. */ 3999 int low = 0, high = count - 1, tmp; 4000 struct ocfs2_xattr_entry *tmp_xe; 4001 4002 while (low <= high && count) { 4003 tmp = (low + high) / 2; 4004 tmp_xe = &xh->xh_entries[tmp]; 4005 4006 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash)) 4007 low = tmp + 1; 4008 else if (name_hash < 4009 le32_to_cpu(tmp_xe->xe_name_hash)) 4010 high = tmp - 1; 4011 else { 4012 low = tmp; 4013 break; 4014 } 4015 } 4016 4017 xe = &xh->xh_entries[low]; 4018 if (low != count) 4019 memmove(xe + 1, xe, (void *)last - (void *)xe); 4020 4021 le16_add_cpu(&xh->xh_count, 1); 4022 memset(xe, 0, sizeof(struct ocfs2_xattr_entry)); 4023 xe->xe_name_hash = cpu_to_le32(name_hash); 4024 xe->xe_name_len = name_len; 4025 ocfs2_xattr_set_type(xe, xi->name_index); 4026 } 4027 4028 set_new_name_value: 4029 /* Insert the new name+value. */ 4030 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len); 4031 4032 /* 4033 * We must make sure that the name/value pair 4034 * exists in the same block. 4035 */ 4036 offs = le16_to_cpu(xh->xh_free_start); 4037 start = offs - size; 4038 4039 if (start >> inode->i_sb->s_blocksize_bits != 4040 (offs - 1) >> inode->i_sb->s_blocksize_bits) { 4041 offs = offs - offs % blocksize; 4042 xh->xh_free_start = cpu_to_le16(offs); 4043 } 4044 4045 val = ocfs2_xattr_bucket_get_val(inode, 4046 &xs->bucket, offs - size); 4047 xe->xe_name_offset = cpu_to_le16(offs - size); 4048 4049 memset(val, 0, size); 4050 memcpy(val, xi->name, name_len); 4051 memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); 4052 4053 xe->xe_value_size = cpu_to_le64(xi->value_len); 4054 ocfs2_xattr_set_local(xe, local); 4055 xs->here = xe; 4056 le16_add_cpu(&xh->xh_free_start, -size); 4057 le16_add_cpu(&xh->xh_name_value_len, size); 4058 4059 return; 4060 } 4061 4062 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode, 4063 handle_t *handle, 4064 struct ocfs2_xattr_search *xs, 4065 struct buffer_head **bhs, 4066 u16 bh_num) 4067 { 4068 int ret = 0, off, block_off; 4069 struct ocfs2_xattr_entry *xe = xs->here; 4070 4071 /* 4072 * First calculate all the blocks we should journal_access 4073 * and journal_dirty. The first block should always be touched. 4074 */ 4075 ret = ocfs2_journal_dirty(handle, bhs[0]); 4076 if (ret) 4077 mlog_errno(ret); 4078 4079 /* calc the data. */ 4080 off = le16_to_cpu(xe->xe_name_offset); 4081 block_off = off >> inode->i_sb->s_blocksize_bits; 4082 ret = ocfs2_journal_dirty(handle, bhs[block_off]); 4083 if (ret) 4084 mlog_errno(ret); 4085 4086 return ret; 4087 } 4088 4089 /* 4090 * Set the xattr entry in the specified bucket. 4091 * The bucket is indicated by xs->bucket and it should have the enough 4092 * space for the xattr insertion. 4093 */ 4094 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode, 4095 struct ocfs2_xattr_info *xi, 4096 struct ocfs2_xattr_search *xs, 4097 u32 name_hash, 4098 int local) 4099 { 4100 int i, ret; 4101 handle_t *handle = NULL; 4102 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4103 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4104 4105 mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n", 4106 (unsigned long)xi->value_len, xi->name_index, 4107 (unsigned long long)xs->bucket.bhs[0]->b_blocknr); 4108 4109 if (!xs->bucket.bhs[1]) { 4110 ret = ocfs2_read_blocks(inode, 4111 xs->bucket.bhs[0]->b_blocknr + 1, 4112 blk_per_bucket - 1, &xs->bucket.bhs[1], 4113 0); 4114 if (ret) { 4115 mlog_errno(ret); 4116 goto out; 4117 } 4118 } 4119 4120 handle = ocfs2_start_trans(osb, blk_per_bucket); 4121 if (IS_ERR(handle)) { 4122 ret = PTR_ERR(handle); 4123 handle = NULL; 4124 mlog_errno(ret); 4125 goto out; 4126 } 4127 4128 for (i = 0; i < blk_per_bucket; i++) { 4129 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i], 4130 OCFS2_JOURNAL_ACCESS_WRITE); 4131 if (ret < 0) { 4132 mlog_errno(ret); 4133 goto out; 4134 } 4135 } 4136 4137 ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local); 4138 4139 /*Only dirty the blocks we have touched in set xattr. */ 4140 ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs, 4141 xs->bucket.bhs, blk_per_bucket); 4142 if (ret) 4143 mlog_errno(ret); 4144 out: 4145 ocfs2_commit_trans(osb, handle); 4146 4147 return ret; 4148 } 4149 4150 static int ocfs2_xattr_value_update_size(struct inode *inode, 4151 struct buffer_head *xe_bh, 4152 struct ocfs2_xattr_entry *xe, 4153 u64 new_size) 4154 { 4155 int ret; 4156 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4157 handle_t *handle = NULL; 4158 4159 handle = ocfs2_start_trans(osb, 1); 4160 if (handle == NULL) { 4161 ret = -ENOMEM; 4162 mlog_errno(ret); 4163 goto out; 4164 } 4165 4166 ret = ocfs2_journal_access(handle, inode, xe_bh, 4167 OCFS2_JOURNAL_ACCESS_WRITE); 4168 if (ret < 0) { 4169 mlog_errno(ret); 4170 goto out_commit; 4171 } 4172 4173 xe->xe_value_size = cpu_to_le64(new_size); 4174 4175 ret = ocfs2_journal_dirty(handle, xe_bh); 4176 if (ret < 0) 4177 mlog_errno(ret); 4178 4179 out_commit: 4180 ocfs2_commit_trans(osb, handle); 4181 out: 4182 return ret; 4183 } 4184 4185 /* 4186 * Truncate the specified xe_off entry in xattr bucket. 4187 * bucket is indicated by header_bh and len is the new length. 4188 * Both the ocfs2_xattr_value_root and the entry will be updated here. 4189 * 4190 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed. 4191 */ 4192 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode, 4193 struct buffer_head *header_bh, 4194 int xe_off, 4195 int len) 4196 { 4197 int ret, offset; 4198 u64 value_blk; 4199 struct buffer_head *value_bh = NULL; 4200 struct ocfs2_xattr_value_root *xv; 4201 struct ocfs2_xattr_entry *xe; 4202 struct ocfs2_xattr_header *xh = 4203 (struct ocfs2_xattr_header *)header_bh->b_data; 4204 size_t blocksize = inode->i_sb->s_blocksize; 4205 4206 xe = &xh->xh_entries[xe_off]; 4207 4208 BUG_ON(!xe || ocfs2_xattr_is_local(xe)); 4209 4210 offset = le16_to_cpu(xe->xe_name_offset) + 4211 OCFS2_XATTR_SIZE(xe->xe_name_len); 4212 4213 value_blk = offset / blocksize; 4214 4215 /* We don't allow ocfs2_xattr_value to be stored in different block. */ 4216 BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize); 4217 value_blk += header_bh->b_blocknr; 4218 4219 ret = ocfs2_read_block(inode, value_blk, &value_bh); 4220 if (ret) { 4221 mlog_errno(ret); 4222 goto out; 4223 } 4224 4225 xv = (struct ocfs2_xattr_value_root *) 4226 (value_bh->b_data + offset % blocksize); 4227 4228 mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n", 4229 xe_off, (unsigned long long)header_bh->b_blocknr, len); 4230 ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len); 4231 if (ret) { 4232 mlog_errno(ret); 4233 goto out; 4234 } 4235 4236 ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len); 4237 if (ret) { 4238 mlog_errno(ret); 4239 goto out; 4240 } 4241 4242 out: 4243 brelse(value_bh); 4244 return ret; 4245 } 4246 4247 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode, 4248 struct ocfs2_xattr_search *xs, 4249 int len) 4250 { 4251 int ret, offset; 4252 struct ocfs2_xattr_entry *xe = xs->here; 4253 struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base; 4254 4255 BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe)); 4256 4257 offset = xe - xh->xh_entries; 4258 ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0], 4259 offset, len); 4260 if (ret) 4261 mlog_errno(ret); 4262 4263 return ret; 4264 } 4265 4266 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode, 4267 struct ocfs2_xattr_search *xs, 4268 char *val, 4269 int value_len) 4270 { 4271 int offset; 4272 struct ocfs2_xattr_value_root *xv; 4273 struct ocfs2_xattr_entry *xe = xs->here; 4274 4275 BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe)); 4276 4277 offset = le16_to_cpu(xe->xe_name_offset) + 4278 OCFS2_XATTR_SIZE(xe->xe_name_len); 4279 4280 xv = (struct ocfs2_xattr_value_root *)(xs->base + offset); 4281 4282 return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len); 4283 } 4284 4285 static int ocfs2_rm_xattr_cluster(struct inode *inode, 4286 struct buffer_head *root_bh, 4287 u64 blkno, 4288 u32 cpos, 4289 u32 len) 4290 { 4291 int ret; 4292 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4293 struct inode *tl_inode = osb->osb_tl_inode; 4294 handle_t *handle; 4295 struct ocfs2_xattr_block *xb = 4296 (struct ocfs2_xattr_block *)root_bh->b_data; 4297 struct ocfs2_alloc_context *meta_ac = NULL; 4298 struct ocfs2_cached_dealloc_ctxt dealloc; 4299 struct ocfs2_extent_tree et; 4300 4301 ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh); 4302 4303 ocfs2_init_dealloc_ctxt(&dealloc); 4304 4305 mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n", 4306 cpos, len, (unsigned long long)blkno); 4307 4308 ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len); 4309 4310 ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac); 4311 if (ret) { 4312 mlog_errno(ret); 4313 return ret; 4314 } 4315 4316 mutex_lock(&tl_inode->i_mutex); 4317 4318 if (ocfs2_truncate_log_needs_flush(osb)) { 4319 ret = __ocfs2_flush_truncate_log(osb); 4320 if (ret < 0) { 4321 mlog_errno(ret); 4322 goto out; 4323 } 4324 } 4325 4326 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); 4327 if (handle == NULL) { 4328 ret = -ENOMEM; 4329 mlog_errno(ret); 4330 goto out; 4331 } 4332 4333 ret = ocfs2_journal_access(handle, inode, root_bh, 4334 OCFS2_JOURNAL_ACCESS_WRITE); 4335 if (ret) { 4336 mlog_errno(ret); 4337 goto out_commit; 4338 } 4339 4340 ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac, 4341 &dealloc); 4342 if (ret) { 4343 mlog_errno(ret); 4344 goto out_commit; 4345 } 4346 4347 le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len); 4348 4349 ret = ocfs2_journal_dirty(handle, root_bh); 4350 if (ret) { 4351 mlog_errno(ret); 4352 goto out_commit; 4353 } 4354 4355 ret = ocfs2_truncate_log_append(osb, handle, blkno, len); 4356 if (ret) 4357 mlog_errno(ret); 4358 4359 out_commit: 4360 ocfs2_commit_trans(osb, handle); 4361 out: 4362 ocfs2_schedule_truncate_log_flush(osb, 1); 4363 4364 mutex_unlock(&tl_inode->i_mutex); 4365 4366 if (meta_ac) 4367 ocfs2_free_alloc_context(meta_ac); 4368 4369 ocfs2_run_deallocs(osb, &dealloc); 4370 4371 return ret; 4372 } 4373 4374 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode, 4375 struct ocfs2_xattr_search *xs) 4376 { 4377 handle_t *handle = NULL; 4378 struct ocfs2_xattr_header *xh = xs->bucket.xh; 4379 struct ocfs2_xattr_entry *last = &xh->xh_entries[ 4380 le16_to_cpu(xh->xh_count) - 1]; 4381 int ret = 0; 4382 4383 handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1); 4384 if (IS_ERR(handle)) { 4385 ret = PTR_ERR(handle); 4386 mlog_errno(ret); 4387 return; 4388 } 4389 4390 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0], 4391 OCFS2_JOURNAL_ACCESS_WRITE); 4392 if (ret) { 4393 mlog_errno(ret); 4394 goto out_commit; 4395 } 4396 4397 /* Remove the old entry. */ 4398 memmove(xs->here, xs->here + 1, 4399 (void *)last - (void *)xs->here); 4400 memset(last, 0, sizeof(struct ocfs2_xattr_entry)); 4401 le16_add_cpu(&xh->xh_count, -1); 4402 4403 ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]); 4404 if (ret < 0) 4405 mlog_errno(ret); 4406 out_commit: 4407 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); 4408 } 4409 4410 /* 4411 * Set the xattr name/value in the bucket specified in xs. 4412 * 4413 * As the new value in xi may be stored in the bucket or in an outside cluster, 4414 * we divide the whole process into 3 steps: 4415 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket) 4416 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs) 4417 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside) 4418 * 4. If the clusters for the new outside value can't be allocated, we need 4419 * to free the xattr we allocated in set. 4420 */ 4421 static int ocfs2_xattr_set_in_bucket(struct inode *inode, 4422 struct ocfs2_xattr_info *xi, 4423 struct ocfs2_xattr_search *xs) 4424 { 4425 int ret, local = 1; 4426 size_t value_len; 4427 char *val = (char *)xi->value; 4428 struct ocfs2_xattr_entry *xe = xs->here; 4429 u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name, 4430 strlen(xi->name)); 4431 4432 if (!xs->not_found && !ocfs2_xattr_is_local(xe)) { 4433 /* 4434 * We need to truncate the xattr storage first. 4435 * 4436 * If both the old and new value are stored to 4437 * outside block, we only need to truncate 4438 * the storage and then set the value outside. 4439 * 4440 * If the new value should be stored within block, 4441 * we should free all the outside block first and 4442 * the modification to the xattr block will be done 4443 * by following steps. 4444 */ 4445 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4446 value_len = xi->value_len; 4447 else 4448 value_len = 0; 4449 4450 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4451 value_len); 4452 if (ret) 4453 goto out; 4454 4455 if (value_len) 4456 goto set_value_outside; 4457 } 4458 4459 value_len = xi->value_len; 4460 /* So we have to handle the inside block change now. */ 4461 if (value_len > OCFS2_XATTR_INLINE_SIZE) { 4462 /* 4463 * If the new value will be stored outside of block, 4464 * initalize a new empty value root and insert it first. 4465 */ 4466 local = 0; 4467 xi->value = &def_xv; 4468 xi->value_len = OCFS2_XATTR_ROOT_SIZE; 4469 } 4470 4471 ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local); 4472 if (ret) { 4473 mlog_errno(ret); 4474 goto out; 4475 } 4476 4477 if (value_len <= OCFS2_XATTR_INLINE_SIZE) 4478 goto out; 4479 4480 /* allocate the space now for the outside block storage. */ 4481 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, 4482 value_len); 4483 if (ret) { 4484 mlog_errno(ret); 4485 4486 if (xs->not_found) { 4487 /* 4488 * We can't allocate enough clusters for outside 4489 * storage and we have allocated xattr already, 4490 * so need to remove it. 4491 */ 4492 ocfs2_xattr_bucket_remove_xs(inode, xs); 4493 } 4494 goto out; 4495 } 4496 4497 set_value_outside: 4498 ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len); 4499 out: 4500 return ret; 4501 } 4502 4503 /* check whether the xattr bucket is filled up with the same hash value. */ 4504 static int ocfs2_check_xattr_bucket_collision(struct inode *inode, 4505 struct ocfs2_xattr_bucket *bucket) 4506 { 4507 struct ocfs2_xattr_header *xh = bucket->xh; 4508 4509 if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash == 4510 xh->xh_entries[0].xe_name_hash) { 4511 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, " 4512 "hash = %u\n", 4513 (unsigned long long)bucket->bhs[0]->b_blocknr, 4514 le32_to_cpu(xh->xh_entries[0].xe_name_hash)); 4515 return -ENOSPC; 4516 } 4517 4518 return 0; 4519 } 4520 4521 static int ocfs2_xattr_set_entry_index_block(struct inode *inode, 4522 struct ocfs2_xattr_info *xi, 4523 struct ocfs2_xattr_search *xs) 4524 { 4525 struct ocfs2_xattr_header *xh; 4526 struct ocfs2_xattr_entry *xe; 4527 u16 count, header_size, xh_free_start; 4528 int i, free, max_free, need, old; 4529 size_t value_size = 0, name_len = strlen(xi->name); 4530 size_t blocksize = inode->i_sb->s_blocksize; 4531 int ret, allocation = 0; 4532 u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); 4533 4534 mlog_entry("Set xattr %s in xattr index block\n", xi->name); 4535 4536 try_again: 4537 xh = xs->header; 4538 count = le16_to_cpu(xh->xh_count); 4539 xh_free_start = le16_to_cpu(xh->xh_free_start); 4540 header_size = sizeof(struct ocfs2_xattr_header) + 4541 count * sizeof(struct ocfs2_xattr_entry); 4542 max_free = OCFS2_XATTR_BUCKET_SIZE - 4543 le16_to_cpu(xh->xh_name_value_len) - header_size; 4544 4545 mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size " 4546 "of %u which exceed block size\n", 4547 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4548 header_size); 4549 4550 if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) 4551 value_size = OCFS2_XATTR_ROOT_SIZE; 4552 else if (xi->value) 4553 value_size = OCFS2_XATTR_SIZE(xi->value_len); 4554 4555 if (xs->not_found) 4556 need = sizeof(struct ocfs2_xattr_entry) + 4557 OCFS2_XATTR_SIZE(name_len) + value_size; 4558 else { 4559 need = value_size + OCFS2_XATTR_SIZE(name_len); 4560 4561 /* 4562 * We only replace the old value if the new length is smaller 4563 * than the old one. Otherwise we will allocate new space in the 4564 * bucket to store it. 4565 */ 4566 xe = xs->here; 4567 if (ocfs2_xattr_is_local(xe)) 4568 old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); 4569 else 4570 old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); 4571 4572 if (old >= value_size) 4573 need = 0; 4574 } 4575 4576 free = xh_free_start - header_size; 4577 /* 4578 * We need to make sure the new name/value pair 4579 * can exist in the same block. 4580 */ 4581 if (xh_free_start % blocksize < need) 4582 free -= xh_free_start % blocksize; 4583 4584 mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, " 4585 "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len =" 4586 " %u\n", xs->not_found, 4587 (unsigned long long)xs->bucket.bhs[0]->b_blocknr, 4588 free, need, max_free, le16_to_cpu(xh->xh_free_start), 4589 le16_to_cpu(xh->xh_name_value_len)); 4590 4591 if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4592 if (need <= max_free && 4593 count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { 4594 /* 4595 * We can create the space by defragment. Since only the 4596 * name/value will be moved, the xe shouldn't be changed 4597 * in xs. 4598 */ 4599 ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket); 4600 if (ret) { 4601 mlog_errno(ret); 4602 goto out; 4603 } 4604 4605 xh_free_start = le16_to_cpu(xh->xh_free_start); 4606 free = xh_free_start - header_size; 4607 if (xh_free_start % blocksize < need) 4608 free -= xh_free_start % blocksize; 4609 4610 if (free >= need) 4611 goto xattr_set; 4612 4613 mlog(0, "Can't get enough space for xattr insert by " 4614 "defragment. Need %u bytes, but we have %d, so " 4615 "allocate new bucket for it.\n", need, free); 4616 } 4617 4618 /* 4619 * We have to add new buckets or clusters and one 4620 * allocation should leave us enough space for insert. 4621 */ 4622 BUG_ON(allocation); 4623 4624 /* 4625 * We do not allow for overlapping ranges between buckets. And 4626 * the maximum number of collisions we will allow for then is 4627 * one bucket's worth, so check it here whether we need to 4628 * add a new bucket for the insert. 4629 */ 4630 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket); 4631 if (ret) { 4632 mlog_errno(ret); 4633 goto out; 4634 } 4635 4636 ret = ocfs2_add_new_xattr_bucket(inode, 4637 xs->xattr_bh, 4638 xs->bucket.bhs[0]); 4639 if (ret) { 4640 mlog_errno(ret); 4641 goto out; 4642 } 4643 4644 for (i = 0; i < blk_per_bucket; i++) 4645 brelse(xs->bucket.bhs[i]); 4646 4647 memset(&xs->bucket, 0, sizeof(xs->bucket)); 4648 4649 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh, 4650 xi->name_index, 4651 xi->name, xs); 4652 if (ret && ret != -ENODATA) 4653 goto out; 4654 xs->not_found = ret; 4655 allocation = 1; 4656 goto try_again; 4657 } 4658 4659 xattr_set: 4660 ret = ocfs2_xattr_set_in_bucket(inode, xi, xs); 4661 out: 4662 mlog_exit(ret); 4663 return ret; 4664 } 4665 4666 static int ocfs2_delete_xattr_in_bucket(struct inode *inode, 4667 struct ocfs2_xattr_bucket *bucket, 4668 void *para) 4669 { 4670 int ret = 0; 4671 struct ocfs2_xattr_header *xh = bucket->xh; 4672 u16 i; 4673 struct ocfs2_xattr_entry *xe; 4674 4675 for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { 4676 xe = &xh->xh_entries[i]; 4677 if (ocfs2_xattr_is_local(xe)) 4678 continue; 4679 4680 ret = ocfs2_xattr_bucket_value_truncate(inode, 4681 bucket->bhs[0], 4682 i, 0); 4683 if (ret) { 4684 mlog_errno(ret); 4685 break; 4686 } 4687 } 4688 4689 return ret; 4690 } 4691 4692 static int ocfs2_delete_xattr_index_block(struct inode *inode, 4693 struct buffer_head *xb_bh) 4694 { 4695 struct ocfs2_xattr_block *xb = 4696 (struct ocfs2_xattr_block *)xb_bh->b_data; 4697 struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; 4698 int ret = 0; 4699 u32 name_hash = UINT_MAX, e_cpos, num_clusters; 4700 u64 p_blkno; 4701 4702 if (le16_to_cpu(el->l_next_free_rec) == 0) 4703 return 0; 4704 4705 while (name_hash > 0) { 4706 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, 4707 &e_cpos, &num_clusters, el); 4708 if (ret) { 4709 mlog_errno(ret); 4710 goto out; 4711 } 4712 4713 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, 4714 ocfs2_delete_xattr_in_bucket, 4715 NULL); 4716 if (ret) { 4717 mlog_errno(ret); 4718 goto out; 4719 } 4720 4721 ret = ocfs2_rm_xattr_cluster(inode, xb_bh, 4722 p_blkno, e_cpos, num_clusters); 4723 if (ret) { 4724 mlog_errno(ret); 4725 break; 4726 } 4727 4728 if (e_cpos == 0) 4729 break; 4730 4731 name_hash = e_cpos - 1; 4732 } 4733 4734 out: 4735 return ret; 4736 } 4737 4738 /* 4739 * 'trusted' attributes support 4740 */ 4741 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list, 4742 size_t list_size, const char *name, 4743 size_t name_len) 4744 { 4745 const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN; 4746 const size_t total_len = prefix_len + name_len + 1; 4747 4748 if (list && total_len <= list_size) { 4749 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); 4750 memcpy(list + prefix_len, name, name_len); 4751 list[prefix_len + name_len] = '\0'; 4752 } 4753 return total_len; 4754 } 4755 4756 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name, 4757 void *buffer, size_t size) 4758 { 4759 if (strcmp(name, "") == 0) 4760 return -EINVAL; 4761 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name, 4762 buffer, size); 4763 } 4764 4765 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name, 4766 const void *value, size_t size, int flags) 4767 { 4768 if (strcmp(name, "") == 0) 4769 return -EINVAL; 4770 4771 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value, 4772 size, flags); 4773 } 4774 4775 struct xattr_handler ocfs2_xattr_trusted_handler = { 4776 .prefix = XATTR_TRUSTED_PREFIX, 4777 .list = ocfs2_xattr_trusted_list, 4778 .get = ocfs2_xattr_trusted_get, 4779 .set = ocfs2_xattr_trusted_set, 4780 }; 4781 4782 /* 4783 * 'user' attributes support 4784 */ 4785 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list, 4786 size_t list_size, const char *name, 4787 size_t name_len) 4788 { 4789 const size_t prefix_len = XATTR_USER_PREFIX_LEN; 4790 const size_t total_len = prefix_len + name_len + 1; 4791 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4792 4793 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR) 4794 return 0; 4795 4796 if (list && total_len <= list_size) { 4797 memcpy(list, XATTR_USER_PREFIX, prefix_len); 4798 memcpy(list + prefix_len, name, name_len); 4799 list[prefix_len + name_len] = '\0'; 4800 } 4801 return total_len; 4802 } 4803 4804 static int ocfs2_xattr_user_get(struct inode *inode, const char *name, 4805 void *buffer, size_t size) 4806 { 4807 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4808 4809 if (strcmp(name, "") == 0) 4810 return -EINVAL; 4811 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR) 4812 return -EOPNOTSUPP; 4813 return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name, 4814 buffer, size); 4815 } 4816 4817 static int ocfs2_xattr_user_set(struct inode *inode, const char *name, 4818 const void *value, size_t size, int flags) 4819 { 4820 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 4821 4822 if (strcmp(name, "") == 0) 4823 return -EINVAL; 4824 if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR) 4825 return -EOPNOTSUPP; 4826 4827 return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value, 4828 size, flags); 4829 } 4830 4831 struct xattr_handler ocfs2_xattr_user_handler = { 4832 .prefix = XATTR_USER_PREFIX, 4833 .list = ocfs2_xattr_user_list, 4834 .get = ocfs2_xattr_user_get, 4835 .set = ocfs2_xattr_user_set, 4836 }; 4837