fs/ocfs2/xattr.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * xattr.c
   5  *
   6  * Copyright (C) 2008 Oracle.  All rights reserved.
   7  *
   8  * CREDITS:
   9  * Lots of code in this file is taken from ext3.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2 of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public
  22  * License along with this program; if not, write to the
  23  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24  * Boston, MA 021110-1307, USA.
  25  */
  26
  27 #include <linux/capability.h>
  28 #include <linux/fs.h>
  29 #include <linux/types.h>
  30 #include <linux/slab.h>
  31 #include <linux/highmem.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/uio.h>
  34 #include <linux/sched.h>
  35 #include <linux/splice.h>
  36 #include <linux/mount.h>
  37 #include <linux/writeback.h>
  38 #include <linux/falloc.h>
  39 #include <linux/sort.h>
  40 #include <linux/init.h>
  41 #include <linux/module.h>
  42 #include <linux/string.h>
  43
  44 #define MLOG_MASK_PREFIX ML_XATTR
  45 #include <cluster/masklog.h>
  46
  47 #include "ocfs2.h"
  48 #include "alloc.h"
  49 #include "dlmglue.h"
  50 #include "file.h"
  51 #include "symlink.h"
  52 #include "sysfile.h"
  53 #include "inode.h"
  54 #include "journal.h"
  55 #include "ocfs2_fs.h"
  56 #include "suballoc.h"
  57 #include "uptodate.h"
  58 #include "buffer_head_io.h"
  59 #include "super.h"
  60 #include "xattr.h"
  61
  62
  63 struct ocfs2_xattr_def_value_root {
  64         struct ocfs2_xattr_value_root   xv;
  65         struct ocfs2_extent_rec         er;
  66 };
  67
  68 struct ocfs2_xattr_bucket {
  69         struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
  70         struct ocfs2_xattr_header *xh;
  71 };
  72
  73 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
  74 #define OCFS2_XATTR_INLINE_SIZE 80
  75
  76 static struct ocfs2_xattr_def_value_root def_xv = {
  77         .xv.xr_list.l_count = cpu_to_le16(1),
  78 };
  79
  80 struct xattr_handler *ocfs2_xattr_handlers[] = {
  81         &ocfs2_xattr_user_handler,
  82         &ocfs2_xattr_trusted_handler,
  83         NULL
  84 };
  85
  86 static struct xattr_handler *ocfs2_xattr_handler_map[] = {
  87         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
  88         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
  89 };
  90
  91 struct ocfs2_xattr_info {
  92         int name_index;
  93         const char *name;
  94         const void *value;
  95         size_t value_len;
  96 };
  97
  98 struct ocfs2_xattr_search {
  99         struct buffer_head *inode_bh;
 100         /*
 101          * xattr_bh point to the block buffer head which has extended attribute
 102          * when extended attribute in inode, xattr_bh is equal to inode_bh.
 103          */
 104         struct buffer_head *xattr_bh;
 105         struct ocfs2_xattr_header *header;
 106         struct ocfs2_xattr_bucket bucket;
 107         void *base;
 108         void *end;
 109         struct ocfs2_xattr_entry *here;
 110         int not_found;
 111 };
 112
 113 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
 114                                              struct ocfs2_xattr_header *xh,
 115                                              int index,
 116                                              int *block_off,
 117                                              int *new_offset);
 118
 119 static int ocfs2_xattr_index_block_find(struct inode *inode,
 120                                         struct buffer_head *root_bh,
 121                                         int name_index,
 122                                         const char *name,
 123                                         struct ocfs2_xattr_search *xs);
 124
 125 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
 126                                         struct ocfs2_xattr_tree_root *xt,
 127                                         char *buffer,
 128                                         size_t buffer_size);
 129
 130 static int ocfs2_xattr_create_index_block(struct inode *inode,
 131                                           struct ocfs2_xattr_search *xs);
 132
 133 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
 134                                              struct ocfs2_xattr_info *xi,
 135                                              struct ocfs2_xattr_search *xs);
 136
 137 static int ocfs2_delete_xattr_index_block(struct inode *inode,
 138                                           struct buffer_head *xb_bh);
 139
 140 static inline struct xattr_handler *ocfs2_xattr_handler(int name_index)
 141 {
 142         struct xattr_handler *handler = NULL;
 143
 144         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
 145                 handler = ocfs2_xattr_handler_map[name_index];
 146
 147         return handler;
 148 }
 149
 150 static u32 ocfs2_xattr_name_hash(struct inode *inode,
 151                                  char *prefix,
 152                                  int prefix_len,
 153                                  char *name,
 154                                  int name_len)
 155 {
 156         /* Get hash value of uuid from super block */
 157         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
 158         int i;
 159
 160         /* hash extended attribute prefix */
 161         for (i = 0; i < prefix_len; i++) {
 162                 hash = (hash << OCFS2_HASH_SHIFT) ^
 163                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 164                        *prefix++;
 165         }
 166         /* hash extended attribute name */
 167         for (i = 0; i < name_len; i++) {
 168                 hash = (hash << OCFS2_HASH_SHIFT) ^
 169                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 170                        *name++;
 171         }
 172
 173         return hash;
 174 }
 175
 176 /*
 177  * ocfs2_xattr_hash_entry()
 178  *
 179  * Compute the hash of an extended attribute.
 180  */
 181 static void ocfs2_xattr_hash_entry(struct inode *inode,
 182                                    struct ocfs2_xattr_header *header,
 183                                    struct ocfs2_xattr_entry *entry)
 184 {
 185         u32 hash = 0;
 186         struct xattr_handler *handler =
 187                         ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
 188         char *prefix = handler->prefix;
 189         char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
 190         int prefix_len = strlen(handler->prefix);
 191
 192         hash = ocfs2_xattr_name_hash(inode, prefix, prefix_len, name,
 193                                      entry->xe_name_len);
 194         entry->xe_name_hash = cpu_to_le32(hash);
 195
 196         return;
 197 }
 198
 199 static int ocfs2_xattr_extend_allocation(struct inode *inode,
 200                                          u32 clusters_to_add,
 201                                          struct buffer_head *xattr_bh,
 202                                          struct ocfs2_xattr_value_root *xv)
 203 {
 204         int status = 0;
 205         int restart_func = 0;
 206         int credits = 0;
 207         handle_t *handle = NULL;
 208         struct ocfs2_alloc_context *data_ac = NULL;
 209         struct ocfs2_alloc_context *meta_ac = NULL;
 210         enum ocfs2_alloc_restarted why;
 211         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 212         u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
 213         struct ocfs2_extent_tree et;
 214
 215         mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
 216
 217         ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
 218
 219 restart_all:
 220
 221         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 222                                        &data_ac, &meta_ac);
 223         if (status) {
 224                 mlog_errno(status);
 225                 goto leave;
 226         }
 227
 228         credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
 229                                             clusters_to_add);
 230         handle = ocfs2_start_trans(osb, credits);
 231         if (IS_ERR(handle)) {
 232                 status = PTR_ERR(handle);
 233                 handle = NULL;
 234                 mlog_errno(status);
 235                 goto leave;
 236         }
 237
 238 restarted_transaction:
 239         status = ocfs2_journal_access(handle, inode, xattr_bh,
 240                                       OCFS2_JOURNAL_ACCESS_WRITE);
 241         if (status < 0) {
 242                 mlog_errno(status);
 243                 goto leave;
 244         }
 245
 246         prev_clusters = le32_to_cpu(xv->xr_clusters);
 247         status = ocfs2_add_clusters_in_btree(osb,
 248                                              inode,
 249                                              &logical_start,
 250                                              clusters_to_add,
 251                                              0,
 252                                              &et,
 253                                              handle,
 254                                              data_ac,
 255                                              meta_ac,
 256                                              &why);
 257         if ((status < 0) && (status != -EAGAIN)) {
 258                 if (status != -ENOSPC)
 259                         mlog_errno(status);
 260                 goto leave;
 261         }
 262
 263         status = ocfs2_journal_dirty(handle, xattr_bh);
 264         if (status < 0) {
 265                 mlog_errno(status);
 266                 goto leave;
 267         }
 268
 269         clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
 270
 271         if (why != RESTART_NONE && clusters_to_add) {
 272                 if (why == RESTART_META) {
 273                         mlog(0, "restarting function.\n");
 274                         restart_func = 1;
 275                 } else {
 276                         BUG_ON(why != RESTART_TRANS);
 277
 278                         mlog(0, "restarting transaction.\n");
 279                         /* TODO: This can be more intelligent. */
 280                         credits = ocfs2_calc_extend_credits(osb->sb,
 281                                                             et.et_root_el,
 282                                                             clusters_to_add);
 283                         status = ocfs2_extend_trans(handle, credits);
 284                         if (status < 0) {
 285                                 /* handle still has to be committed at
 286                                  * this point. */
 287                                 status = -ENOMEM;
 288                                 mlog_errno(status);
 289                                 goto leave;
 290                         }
 291                         goto restarted_transaction;
 292                 }
 293         }
 294
 295 leave:
 296         if (handle) {
 297                 ocfs2_commit_trans(osb, handle);
 298                 handle = NULL;
 299         }
 300         if (data_ac) {
 301                 ocfs2_free_alloc_context(data_ac);
 302                 data_ac = NULL;
 303         }
 304         if (meta_ac) {
 305                 ocfs2_free_alloc_context(meta_ac);
 306                 meta_ac = NULL;
 307         }
 308         if ((!status) && restart_func) {
 309                 restart_func = 0;
 310                 goto restart_all;
 311         }
 312
 313         return status;
 314 }
 315
 316 static int __ocfs2_remove_xattr_range(struct inode *inode,
 317                                       struct buffer_head *root_bh,
 318                                       struct ocfs2_xattr_value_root *xv,
 319                                       u32 cpos, u32 phys_cpos, u32 len,
 320                                       struct ocfs2_cached_dealloc_ctxt *dealloc)
 321 {
 322         int ret;
 323         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 324         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 325         struct inode *tl_inode = osb->osb_tl_inode;
 326         handle_t *handle;
 327         struct ocfs2_alloc_context *meta_ac = NULL;
 328         struct ocfs2_extent_tree et;
 329
 330         ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
 331
 332         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
 333         if (ret) {
 334                 mlog_errno(ret);
 335                 return ret;
 336         }
 337
 338         mutex_lock(&tl_inode->i_mutex);
 339
 340         if (ocfs2_truncate_log_needs_flush(osb)) {
 341                 ret = __ocfs2_flush_truncate_log(osb);
 342                 if (ret < 0) {
 343                         mlog_errno(ret);
 344                         goto out;
 345                 }
 346         }
 347
 348         handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
 349         if (IS_ERR(handle)) {
 350                 ret = PTR_ERR(handle);
 351                 mlog_errno(ret);
 352                 goto out;
 353         }
 354
 355         ret = ocfs2_journal_access(handle, inode, root_bh,
 356                                    OCFS2_JOURNAL_ACCESS_WRITE);
 357         if (ret) {
 358                 mlog_errno(ret);
 359                 goto out_commit;
 360         }
 361
 362         ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
 363                                   dealloc);
 364         if (ret) {
 365                 mlog_errno(ret);
 366                 goto out_commit;
 367         }
 368
 369         le32_add_cpu(&xv->xr_clusters, -len);
 370
 371         ret = ocfs2_journal_dirty(handle, root_bh);
 372         if (ret) {
 373                 mlog_errno(ret);
 374                 goto out_commit;
 375         }
 376
 377         ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
 378         if (ret)
 379                 mlog_errno(ret);
 380
 381 out_commit:
 382         ocfs2_commit_trans(osb, handle);
 383 out:
 384         mutex_unlock(&tl_inode->i_mutex);
 385
 386         if (meta_ac)
 387                 ocfs2_free_alloc_context(meta_ac);
 388
 389         return ret;
 390 }
 391
 392 static int ocfs2_xattr_shrink_size(struct inode *inode,
 393                                    u32 old_clusters,
 394                                    u32 new_clusters,
 395                                    struct buffer_head *root_bh,
 396                                    struct ocfs2_xattr_value_root *xv)
 397 {
 398         int ret = 0;
 399         u32 trunc_len, cpos, phys_cpos, alloc_size;
 400         u64 block;
 401         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 402         struct ocfs2_cached_dealloc_ctxt dealloc;
 403
 404         ocfs2_init_dealloc_ctxt(&dealloc);
 405
 406         if (old_clusters <= new_clusters)
 407                 return 0;
 408
 409         cpos = new_clusters;
 410         trunc_len = old_clusters - new_clusters;
 411         while (trunc_len) {
 412                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
 413                                                &alloc_size, &xv->xr_list);
 414                 if (ret) {
 415                         mlog_errno(ret);
 416                         goto out;
 417                 }
 418
 419                 if (alloc_size > trunc_len)
 420                         alloc_size = trunc_len;
 421
 422                 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
 423                                                  phys_cpos, alloc_size,
 424                                                  &dealloc);
 425                 if (ret) {
 426                         mlog_errno(ret);
 427                         goto out;
 428                 }
 429
 430                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 431                 ocfs2_remove_xattr_clusters_from_cache(inode, block,
 432                                                        alloc_size);
 433                 cpos += alloc_size;
 434                 trunc_len -= alloc_size;
 435         }
 436
 437 out:
 438         ocfs2_schedule_truncate_log_flush(osb, 1);
 439         ocfs2_run_deallocs(osb, &dealloc);
 440
 441         return ret;
 442 }
 443
 444 static int ocfs2_xattr_value_truncate(struct inode *inode,
 445                                       struct buffer_head *root_bh,
 446                                       struct ocfs2_xattr_value_root *xv,
 447                                       int len)
 448 {
 449         int ret;
 450         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
 451         u32 old_clusters = le32_to_cpu(xv->xr_clusters);
 452
 453         if (new_clusters == old_clusters)
 454                 return 0;
 455
 456         if (new_clusters > old_clusters)
 457                 ret = ocfs2_xattr_extend_allocation(inode,
 458                                                     new_clusters - old_clusters,
 459                                                     root_bh, xv);
 460         else
 461                 ret = ocfs2_xattr_shrink_size(inode,
 462                                               old_clusters, new_clusters,
 463                                               root_bh, xv);
 464
 465         return ret;
 466 }
 467
 468 static int ocfs2_xattr_list_entries(struct inode *inode,
 469                                     struct ocfs2_xattr_header *header,
 470                                     char *buffer, size_t buffer_size)
 471 {
 472         size_t rest = buffer_size;
 473         int i;
 474
 475         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
 476                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 477                 struct xattr_handler *handler =
 478                         ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
 479
 480                 if (handler) {
 481                         size_t size = handler->list(inode, buffer, rest,
 482                                         ((char *)header +
 483                                         le16_to_cpu(entry->xe_name_offset)),
 484                                         entry->xe_name_len);
 485                         if (buffer) {
 486                                 if (size > rest)
 487                                         return -ERANGE;
 488                                 buffer += size;
 489                         }
 490                         rest -= size;
 491                 }
 492         }
 493
 494         return buffer_size - rest;
 495 }
 496
 497 static int ocfs2_xattr_ibody_list(struct inode *inode,
 498                                   struct ocfs2_dinode *di,
 499                                   char *buffer,
 500                                   size_t buffer_size)
 501 {
 502         struct ocfs2_xattr_header *header = NULL;
 503         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 504         int ret = 0;
 505
 506         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 507                 return ret;
 508
 509         header = (struct ocfs2_xattr_header *)
 510                  ((void *)di + inode->i_sb->s_blocksize -
 511                  le16_to_cpu(di->i_xattr_inline_size));
 512
 513         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
 514
 515         return ret;
 516 }
 517
 518 static int ocfs2_xattr_block_list(struct inode *inode,
 519                                   struct ocfs2_dinode *di,
 520                                   char *buffer,
 521                                   size_t buffer_size)
 522 {
 523         struct buffer_head *blk_bh = NULL;
 524         struct ocfs2_xattr_block *xb;
 525         int ret = 0;
 526
 527         if (!di->i_xattr_loc)
 528                 return ret;
 529
 530         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
 531                                le64_to_cpu(di->i_xattr_loc),
 532                                &blk_bh, OCFS2_BH_CACHED, inode);
 533         if (ret < 0) {
 534                 mlog_errno(ret);
 535                 return ret;
 536         }
 537         /*Verify the signature of xattr block*/
 538         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
 539                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
 540                 ret = -EFAULT;
 541                 goto cleanup;
 542         }
 543
 544         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 545
 546         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 547                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
 548                 ret = ocfs2_xattr_list_entries(inode, header,
 549                                                buffer, buffer_size);
 550         } else {
 551                 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
 552                 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
 553                                                    buffer, buffer_size);
 554         }
 555 cleanup:
 556         brelse(blk_bh);
 557
 558         return ret;
 559 }
 560
 561 ssize_t ocfs2_listxattr(struct dentry *dentry,
 562                         char *buffer,
 563                         size_t size)
 564 {
 565         int ret = 0, i_ret = 0, b_ret = 0;
 566         struct buffer_head *di_bh = NULL;
 567         struct ocfs2_dinode *di = NULL;
 568         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
 569
 570         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
 571                 return -EOPNOTSUPP;
 572
 573         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 574                 return ret;
 575
 576         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
 577         if (ret < 0) {
 578                 mlog_errno(ret);
 579                 return ret;
 580         }
 581
 582         di = (struct ocfs2_dinode *)di_bh->b_data;
 583
 584         down_read(&oi->ip_xattr_sem);
 585         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
 586         if (i_ret < 0)
 587                 b_ret = 0;
 588         else {
 589                 if (buffer) {
 590                         buffer += i_ret;
 591                         size -= i_ret;
 592                 }
 593                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
 594                                                buffer, size);
 595                 if (b_ret < 0)
 596                         i_ret = 0;
 597         }
 598         up_read(&oi->ip_xattr_sem);
 599         ocfs2_inode_unlock(dentry->d_inode, 0);
 600
 601         brelse(di_bh);
 602
 603         return i_ret + b_ret;
 604 }
 605
 606 static int ocfs2_xattr_find_entry(int name_index,
 607                                   const char *name,
 608                                   struct ocfs2_xattr_search *xs)
 609 {
 610         struct ocfs2_xattr_entry *entry;
 611         size_t name_len;
 612         int i, cmp = 1;
 613
 614         if (name == NULL)
 615                 return -EINVAL;
 616
 617         name_len = strlen(name);
 618         entry = xs->here;
 619         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
 620                 cmp = name_index - ocfs2_xattr_get_type(entry);
 621                 if (!cmp)
 622                         cmp = name_len - entry->xe_name_len;
 623                 if (!cmp)
 624                         cmp = memcmp(name, (xs->base +
 625                                      le16_to_cpu(entry->xe_name_offset)),
 626                                      name_len);
 627                 if (cmp == 0)
 628                         break;
 629                 entry += 1;
 630         }
 631         xs->here = entry;
 632
 633         return cmp ? -ENODATA : 0;
 634 }
 635
 636 static int ocfs2_xattr_get_value_outside(struct inode *inode,
 637                                          struct ocfs2_xattr_value_root *xv,
 638                                          void *buffer,
 639                                          size_t len)
 640 {
 641         u32 cpos, p_cluster, num_clusters, bpc, clusters;
 642         u64 blkno;
 643         int i, ret = 0;
 644         size_t cplen, blocksize;
 645         struct buffer_head *bh = NULL;
 646         struct ocfs2_extent_list *el;
 647
 648         el = &xv->xr_list;
 649         clusters = le32_to_cpu(xv->xr_clusters);
 650         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 651         blocksize = inode->i_sb->s_blocksize;
 652
 653         cpos = 0;
 654         while (cpos < clusters) {
 655                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 656                                                &num_clusters, el);
 657                 if (ret) {
 658                         mlog_errno(ret);
 659                         goto out;
 660                 }
 661
 662                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 663                 /* Copy ocfs2_xattr_value */
 664                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
 665                         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
 666                                                &bh, OCFS2_BH_CACHED, inode);
 667                         if (ret) {
 668                                 mlog_errno(ret);
 669                                 goto out;
 670                         }
 671
 672                         cplen = len >= blocksize ? blocksize : len;
 673                         memcpy(buffer, bh->b_data, cplen);
 674                         len -= cplen;
 675                         buffer += cplen;
 676
 677                         brelse(bh);
 678                         bh = NULL;
 679                         if (len == 0)
 680                                 break;
 681                 }
 682                 cpos += num_clusters;
 683         }
 684 out:
 685         return ret;
 686 }
 687
 688 static int ocfs2_xattr_ibody_get(struct inode *inode,
 689                                  int name_index,
 690                                  const char *name,
 691                                  void *buffer,
 692                                  size_t buffer_size,
 693                                  struct ocfs2_xattr_search *xs)
 694 {
 695         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 696         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
 697         struct ocfs2_xattr_value_root *xv;
 698         size_t size;
 699         int ret = 0;
 700
 701         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 702                 return -ENODATA;
 703
 704         xs->end = (void *)di + inode->i_sb->s_blocksize;
 705         xs->header = (struct ocfs2_xattr_header *)
 706                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
 707         xs->base = (void *)xs->header;
 708         xs->here = xs->header->xh_entries;
 709
 710         ret = ocfs2_xattr_find_entry(name_index, name, xs);
 711         if (ret)
 712                 return ret;
 713         size = le64_to_cpu(xs->here->xe_value_size);
 714         if (buffer) {
 715                 if (size > buffer_size)
 716                         return -ERANGE;
 717                 if (ocfs2_xattr_is_local(xs->here)) {
 718                         memcpy(buffer, (void *)xs->base +
 719                                le16_to_cpu(xs->here->xe_name_offset) +
 720                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
 721                 } else {
 722                         xv = (struct ocfs2_xattr_value_root *)
 723                                 (xs->base + le16_to_cpu(
 724                                  xs->here->xe_name_offset) +
 725                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
 726                         ret = ocfs2_xattr_get_value_outside(inode, xv,
 727                                                             buffer, size);
 728                         if (ret < 0) {
 729                                 mlog_errno(ret);
 730                                 return ret;
 731                         }
 732                 }
 733         }
 734
 735         return size;
 736 }
 737
 738 static int ocfs2_xattr_block_get(struct inode *inode,
 739                                  int name_index,
 740                                  const char *name,
 741                                  void *buffer,
 742                                  size_t buffer_size,
 743                                  struct ocfs2_xattr_search *xs)
 744 {
 745         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
 746         struct buffer_head *blk_bh = NULL;
 747         struct ocfs2_xattr_block *xb;
 748         struct ocfs2_xattr_value_root *xv;
 749         size_t size;
 750         int ret = -ENODATA, name_offset, name_len, block_off, i;
 751
 752         if (!di->i_xattr_loc)
 753                 return ret;
 754
 755         memset(&xs->bucket, 0, sizeof(xs->bucket));
 756
 757         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
 758                                le64_to_cpu(di->i_xattr_loc),
 759                                &blk_bh, OCFS2_BH_CACHED, inode);
 760         if (ret < 0) {
 761                 mlog_errno(ret);
 762                 return ret;
 763         }
 764         /*Verify the signature of xattr block*/
 765         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
 766                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
 767                 ret = -EFAULT;
 768                 goto cleanup;
 769         }
 770
 771         xs->xattr_bh = blk_bh;
 772         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 773
 774         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 775                 xs->header = &xb->xb_attrs.xb_header;
 776                 xs->base = (void *)xs->header;
 777                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
 778                 xs->here = xs->header->xh_entries;
 779
 780                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
 781         } else
 782                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
 783                                                    name_index,
 784                                                    name, xs);
 785
 786         if (ret)
 787                 goto cleanup;
 788         size = le64_to_cpu(xs->here->xe_value_size);
 789         if (buffer) {
 790                 ret = -ERANGE;
 791                 if (size > buffer_size)
 792                         goto cleanup;
 793
 794                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
 795                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
 796                 i = xs->here - xs->header->xh_entries;
 797
 798                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
 799                         ret = ocfs2_xattr_bucket_get_name_value(inode,
 800                                                                 xs->bucket.xh,
 801                                                                 i,
 802                                                                 &block_off,
 803                                                                 &name_offset);
 804                         xs->base = xs->bucket.bhs[block_off]->b_data;
 805                 }
 806                 if (ocfs2_xattr_is_local(xs->here)) {
 807                         memcpy(buffer, (void *)xs->base +
 808                                name_offset + name_len, size);
 809                 } else {
 810                         xv = (struct ocfs2_xattr_value_root *)
 811                                 (xs->base + name_offset + name_len);
 812                         ret = ocfs2_xattr_get_value_outside(inode, xv,
 813                                                             buffer, size);
 814                         if (ret < 0) {
 815                                 mlog_errno(ret);
 816                                 goto cleanup;
 817                         }
 818                 }
 819         }
 820         ret = size;
 821 cleanup:
 822         for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
 823                 brelse(xs->bucket.bhs[i]);
 824         memset(&xs->bucket, 0, sizeof(xs->bucket));
 825
 826         brelse(blk_bh);
 827         return ret;
 828 }
 829
 830 /* ocfs2_xattr_get()
 831  *
 832  * Copy an extended attribute into the buffer provided.
 833  * Buffer is NULL to compute the size of buffer required.
 834  */
 835 int ocfs2_xattr_get(struct inode *inode,
 836                     int name_index,
 837                     const char *name,
 838                     void *buffer,
 839                     size_t buffer_size)
 840 {
 841         int ret;
 842         struct ocfs2_dinode *di = NULL;
 843         struct buffer_head *di_bh = NULL;
 844         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 845         struct ocfs2_xattr_search xis = {
 846                 .not_found = -ENODATA,
 847         };
 848         struct ocfs2_xattr_search xbs = {
 849                 .not_found = -ENODATA,
 850         };
 851
 852         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
 853                 return -EOPNOTSUPP;
 854
 855         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 856                 ret = -ENODATA;
 857
 858         ret = ocfs2_inode_lock(inode, &di_bh, 0);
 859         if (ret < 0) {
 860                 mlog_errno(ret);
 861                 return ret;
 862         }
 863         xis.inode_bh = xbs.inode_bh = di_bh;
 864         di = (struct ocfs2_dinode *)di_bh->b_data;
 865
 866         down_read(&oi->ip_xattr_sem);
 867         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
 868                                     buffer_size, &xis);
 869         if (ret == -ENODATA)
 870                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
 871                                             buffer_size, &xbs);
 872         up_read(&oi->ip_xattr_sem);
 873         ocfs2_inode_unlock(inode, 0);
 874
 875         brelse(di_bh);
 876
 877         return ret;
 878 }
 879
 880 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
 881                                            struct ocfs2_xattr_value_root *xv,
 882                                            const void *value,
 883                                            int value_len)
 884 {
 885         int ret = 0, i, cp_len, credits;
 886         u16 blocksize = inode->i_sb->s_blocksize;
 887         u32 p_cluster, num_clusters;
 888         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 889         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
 890         u64 blkno;
 891         struct buffer_head *bh = NULL;
 892         handle_t *handle;
 893
 894         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
 895
 896         credits = clusters * bpc;
 897         handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
 898         if (IS_ERR(handle)) {
 899                 ret = PTR_ERR(handle);
 900                 mlog_errno(ret);
 901                 goto out;
 902         }
 903
 904         while (cpos < clusters) {
 905                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 906                                                &num_clusters, &xv->xr_list);
 907                 if (ret) {
 908                         mlog_errno(ret);
 909                         goto out_commit;
 910                 }
 911
 912                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 913
 914                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
 915                         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
 916                                                &bh, OCFS2_BH_CACHED, inode);
 917                         if (ret) {
 918                                 mlog_errno(ret);
 919                                 goto out_commit;
 920                         }
 921
 922                         ret = ocfs2_journal_access(handle,
 923                                                    inode,
 924                                                    bh,
 925                                                    OCFS2_JOURNAL_ACCESS_WRITE);
 926                         if (ret < 0) {
 927                                 mlog_errno(ret);
 928                                 goto out_commit;
 929                         }
 930
 931                         cp_len = value_len > blocksize ? blocksize : value_len;
 932                         memcpy(bh->b_data, value, cp_len);
 933                         value_len -= cp_len;
 934                         value += cp_len;
 935                         if (cp_len < blocksize)
 936                                 memset(bh->b_data + cp_len, 0,
 937                                        blocksize - cp_len);
 938
 939                         ret = ocfs2_journal_dirty(handle, bh);
 940                         if (ret < 0) {
 941                                 mlog_errno(ret);
 942                                 goto out_commit;
 943                         }
 944                         brelse(bh);
 945                         bh = NULL;
 946
 947                         /*
 948                          * XXX: do we need to empty all the following
 949                          * blocks in this cluster?
 950                          */
 951                         if (!value_len)
 952                                 break;
 953                 }
 954                 cpos += num_clusters;
 955         }
 956 out_commit:
 957         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 958 out:
 959         brelse(bh);
 960
 961         return ret;
 962 }
 963
 964 static int ocfs2_xattr_cleanup(struct inode *inode,
 965                                struct ocfs2_xattr_info *xi,
 966                                struct ocfs2_xattr_search *xs,
 967                                size_t offs)
 968 {
 969         handle_t *handle = NULL;
 970         int ret = 0;
 971         size_t name_len = strlen(xi->name);
 972         void *val = xs->base + offs;
 973         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 974
 975         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
 976                                    OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
 977         if (IS_ERR(handle)) {
 978                 ret = PTR_ERR(handle);
 979                 mlog_errno(ret);
 980                 goto out;
 981         }
 982         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
 983                                    OCFS2_JOURNAL_ACCESS_WRITE);
 984         if (ret) {
 985                 mlog_errno(ret);
 986                 goto out_commit;
 987         }
 988         /* Decrease xattr count */
 989         le16_add_cpu(&xs->header->xh_count, -1);
 990         /* Remove the xattr entry and tree root which has already be set*/
 991         memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
 992         memset(val, 0, size);
 993
 994         ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
 995         if (ret < 0)
 996                 mlog_errno(ret);
 997 out_commit:
 998         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 999 out:
1000         return ret;
1001 }
1002
1003 static int ocfs2_xattr_update_entry(struct inode *inode,
1004                                     struct ocfs2_xattr_info *xi,
1005                                     struct ocfs2_xattr_search *xs,
1006                                     size_t offs)
1007 {
1008         handle_t *handle = NULL;
1009         int ret = 0;
1010
1011         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1012                                    OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1013         if (IS_ERR(handle)) {
1014                 ret = PTR_ERR(handle);
1015                 mlog_errno(ret);
1016                 goto out;
1017         }
1018         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1019                                    OCFS2_JOURNAL_ACCESS_WRITE);
1020         if (ret) {
1021                 mlog_errno(ret);
1022                 goto out_commit;
1023         }
1024
1025         xs->here->xe_name_offset = cpu_to_le16(offs);
1026         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1027         if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1028                 ocfs2_xattr_set_local(xs->here, 1);
1029         else
1030                 ocfs2_xattr_set_local(xs->here, 0);
1031         ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1032
1033         ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1034         if (ret < 0)
1035                 mlog_errno(ret);
1036 out_commit:
1037         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1038 out:
1039         return ret;
1040 }
1041
1042 /*
1043  * ocfs2_xattr_set_value_outside()
1044  *
1045  * Set large size value in B tree.
1046  */
1047 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1048                                          struct ocfs2_xattr_info *xi,
1049                                          struct ocfs2_xattr_search *xs,
1050                                          size_t offs)
1051 {
1052         size_t name_len = strlen(xi->name);
1053         void *val = xs->base + offs;
1054         struct ocfs2_xattr_value_root *xv = NULL;
1055         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1056         int ret = 0;
1057
1058         memset(val, 0, size);
1059         memcpy(val, xi->name, name_len);
1060         xv = (struct ocfs2_xattr_value_root *)
1061                 (val + OCFS2_XATTR_SIZE(name_len));
1062         xv->xr_clusters = 0;
1063         xv->xr_last_eb_blk = 0;
1064         xv->xr_list.l_tree_depth = 0;
1065         xv->xr_list.l_count = cpu_to_le16(1);
1066         xv->xr_list.l_next_free_rec = 0;
1067
1068         ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
1069                                          xi->value_len);
1070         if (ret < 0) {
1071                 mlog_errno(ret);
1072                 return ret;
1073         }
1074         ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
1075                                               xi->value_len);
1076         if (ret < 0) {
1077                 mlog_errno(ret);
1078                 return ret;
1079         }
1080         ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
1081         if (ret < 0)
1082                 mlog_errno(ret);
1083
1084         return ret;
1085 }
1086
1087 /*
1088  * ocfs2_xattr_set_entry_local()
1089  *
1090  * Set, replace or remove extended attribute in local.
1091  */
1092 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1093                                         struct ocfs2_xattr_info *xi,
1094                                         struct ocfs2_xattr_search *xs,
1095                                         struct ocfs2_xattr_entry *last,
1096                                         size_t min_offs)
1097 {
1098         size_t name_len = strlen(xi->name);
1099         int i;
1100
1101         if (xi->value && xs->not_found) {
1102                 /* Insert the new xattr entry. */
1103                 le16_add_cpu(&xs->header->xh_count, 1);
1104                 ocfs2_xattr_set_type(last, xi->name_index);
1105                 ocfs2_xattr_set_local(last, 1);
1106                 last->xe_name_len = name_len;
1107         } else {
1108                 void *first_val;
1109                 void *val;
1110                 size_t offs, size;
1111
1112                 first_val = xs->base + min_offs;
1113                 offs = le16_to_cpu(xs->here->xe_name_offset);
1114                 val = xs->base + offs;
1115
1116                 if (le64_to_cpu(xs->here->xe_value_size) >
1117                     OCFS2_XATTR_INLINE_SIZE)
1118                         size = OCFS2_XATTR_SIZE(name_len) +
1119                                 OCFS2_XATTR_ROOT_SIZE;
1120                 else
1121                         size = OCFS2_XATTR_SIZE(name_len) +
1122                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1123
1124                 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1125                                 OCFS2_XATTR_SIZE(xi->value_len)) {
1126                         /* The old and the new value have the
1127                            same size. Just replace the value. */
1128                         ocfs2_xattr_set_local(xs->here, 1);
1129                         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1130                         /* Clear value bytes. */
1131                         memset(val + OCFS2_XATTR_SIZE(name_len),
1132                                0,
1133                                OCFS2_XATTR_SIZE(xi->value_len));
1134                         memcpy(val + OCFS2_XATTR_SIZE(name_len),
1135                                xi->value,
1136                                xi->value_len);
1137                         return;
1138                 }
1139                 /* Remove the old name+value. */
1140                 memmove(first_val + size, first_val, val - first_val);
1141                 memset(first_val, 0, size);
1142                 xs->here->xe_name_hash = 0;
1143                 xs->here->xe_name_offset = 0;
1144                 ocfs2_xattr_set_local(xs->here, 1);
1145                 xs->here->xe_value_size = 0;
1146
1147                 min_offs += size;
1148
1149                 /* Adjust all value offsets. */
1150                 last = xs->header->xh_entries;
1151                 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1152                         size_t o = le16_to_cpu(last->xe_name_offset);
1153
1154                         if (o < offs)
1155                                 last->xe_name_offset = cpu_to_le16(o + size);
1156                         last += 1;
1157                 }
1158
1159                 if (!xi->value) {
1160                         /* Remove the old entry. */
1161                         last -= 1;
1162                         memmove(xs->here, xs->here + 1,
1163                                 (void *)last - (void *)xs->here);
1164                         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1165                         le16_add_cpu(&xs->header->xh_count, -1);
1166                 }
1167         }
1168         if (xi->value) {
1169                 /* Insert the new name+value. */
1170                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1171                                 OCFS2_XATTR_SIZE(xi->value_len);
1172                 void *val = xs->base + min_offs - size;
1173
1174                 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1175                 memset(val, 0, size);
1176                 memcpy(val, xi->name, name_len);
1177                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1178                        xi->value,
1179                        xi->value_len);
1180                 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1181                 ocfs2_xattr_set_local(xs->here, 1);
1182                 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1183         }
1184
1185         return;
1186 }
1187
1188 /*
1189  * ocfs2_xattr_set_entry()
1190  *
1191  * Set extended attribute entry into inode or block.
1192  *
1193  * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1194  * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1195  * then set value in B tree with set_value_outside().
1196  */
1197 static int ocfs2_xattr_set_entry(struct inode *inode,
1198                                  struct ocfs2_xattr_info *xi,
1199                                  struct ocfs2_xattr_search *xs,
1200                                  int flag)
1201 {
1202         struct ocfs2_xattr_entry *last;
1203         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1204         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1205         size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1206         size_t size_l = 0;
1207         handle_t *handle = NULL;
1208         int free, i, ret;
1209         struct ocfs2_xattr_info xi_l = {
1210                 .name_index = xi->name_index,
1211                 .name = xi->name,
1212                 .value = xi->value,
1213                 .value_len = xi->value_len,
1214         };
1215
1216         /* Compute min_offs, last and free space. */
1217         last = xs->header->xh_entries;
1218
1219         for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1220                 size_t offs = le16_to_cpu(last->xe_name_offset);
1221                 if (offs < min_offs)
1222                         min_offs = offs;
1223                 last += 1;
1224         }
1225
1226         free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
1227         if (free < 0)
1228                 return -EFAULT;
1229
1230         if (!xs->not_found) {
1231                 size_t size = 0;
1232                 if (ocfs2_xattr_is_local(xs->here))
1233                         size = OCFS2_XATTR_SIZE(name_len) +
1234                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1235                 else
1236                         size = OCFS2_XATTR_SIZE(name_len) +
1237                                 OCFS2_XATTR_ROOT_SIZE;
1238                 free += (size + sizeof(struct ocfs2_xattr_entry));
1239         }
1240         /* Check free space in inode or block */
1241         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1242                 if (free < sizeof(struct ocfs2_xattr_entry) +
1243                            OCFS2_XATTR_SIZE(name_len) +
1244                            OCFS2_XATTR_ROOT_SIZE) {
1245                         ret = -ENOSPC;
1246                         goto out;
1247                 }
1248                 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1249                 xi_l.value = (void *)&def_xv;
1250                 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1251         } else if (xi->value) {
1252                 if (free < sizeof(struct ocfs2_xattr_entry) +
1253                            OCFS2_XATTR_SIZE(name_len) +
1254                            OCFS2_XATTR_SIZE(xi->value_len)) {
1255                         ret = -ENOSPC;
1256                         goto out;
1257                 }
1258         }
1259
1260         if (!xs->not_found) {
1261                 /* For existing extended attribute */
1262                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1263                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1264                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1265                 void *val = xs->base + offs;
1266
1267                 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1268                         /* Replace existing local xattr with tree root */
1269                         ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1270                                                             offs);
1271                         if (ret < 0)
1272                                 mlog_errno(ret);
1273                         goto out;
1274                 } else if (!ocfs2_xattr_is_local(xs->here)) {
1275                         /* For existing xattr which has value outside */
1276                         struct ocfs2_xattr_value_root *xv = NULL;
1277                         xv = (struct ocfs2_xattr_value_root *)(val +
1278                                 OCFS2_XATTR_SIZE(name_len));
1279
1280                         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1281                                 /*
1282                                  * If new value need set outside also,
1283                                  * first truncate old value to new value,
1284                                  * then set new value with set_value_outside().
1285                                  */
1286                                 ret = ocfs2_xattr_value_truncate(inode,
1287                                                                  xs->xattr_bh,
1288                                                                  xv,
1289                                                                  xi->value_len);
1290                                 if (ret < 0) {
1291                                         mlog_errno(ret);
1292                                         goto out;
1293                                 }
1294
1295                                 ret = __ocfs2_xattr_set_value_outside(inode,
1296                                                                 xv,
1297                                                                 xi->value,
1298                                                                 xi->value_len);
1299                                 if (ret < 0) {
1300                                         mlog_errno(ret);
1301                                         goto out;
1302                                 }
1303
1304                                 ret = ocfs2_xattr_update_entry(inode,
1305                                                                xi,
1306                                                                xs,
1307                                                                offs);
1308                                 if (ret < 0)
1309                                         mlog_errno(ret);
1310                                 goto out;
1311                         } else {
1312                                 /*
1313                                  * If new value need set in local,
1314                                  * just trucate old value to zero.
1315                                  */
1316                                  ret = ocfs2_xattr_value_truncate(inode,
1317                                                                  xs->xattr_bh,
1318                                                                  xv,
1319                                                                  0);
1320                                 if (ret < 0)
1321                                         mlog_errno(ret);
1322                         }
1323                 }
1324         }
1325
1326         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1327                                    OCFS2_INODE_UPDATE_CREDITS);
1328         if (IS_ERR(handle)) {
1329                 ret = PTR_ERR(handle);
1330                 mlog_errno(ret);
1331                 goto out;
1332         }
1333
1334         ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1335                                    OCFS2_JOURNAL_ACCESS_WRITE);
1336         if (ret) {
1337                 mlog_errno(ret);
1338                 goto out_commit;
1339         }
1340
1341         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1342                 /* set extended attribute in external block. */
1343                 ret = ocfs2_extend_trans(handle,
1344                                          OCFS2_INODE_UPDATE_CREDITS +
1345                                          OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1346                 if (ret) {
1347                         mlog_errno(ret);
1348                         goto out_commit;
1349                 }
1350                 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1351                                            OCFS2_JOURNAL_ACCESS_WRITE);
1352                 if (ret) {
1353                         mlog_errno(ret);
1354                         goto out_commit;
1355                 }
1356         }
1357
1358         /*
1359          * Set value in local, include set tree root in local.
1360          * This is the first step for value size >INLINE_SIZE.
1361          */
1362         ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1363
1364         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1365                 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1366                 if (ret < 0) {
1367                         mlog_errno(ret);
1368                         goto out_commit;
1369                 }
1370         }
1371
1372         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1373             (flag & OCFS2_INLINE_XATTR_FL)) {
1374                 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1375                 unsigned int xattrsize = osb->s_xattr_inline_size;
1376
1377                 /*
1378                  * Adjust extent record count or inline data size
1379                  * to reserve space for extended attribute.
1380                  */
1381                 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1382                         struct ocfs2_inline_data *idata = &di->id2.i_data;
1383                         le16_add_cpu(&idata->id_count, -xattrsize);
1384                 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1385                         struct ocfs2_extent_list *el = &di->id2.i_list;
1386                         le16_add_cpu(&el->l_count, -(xattrsize /
1387                                         sizeof(struct ocfs2_extent_rec)));
1388                 }
1389                 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1390         }
1391         /* Update xattr flag */
1392         spin_lock(&oi->ip_lock);
1393         oi->ip_dyn_features |= flag;
1394         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1395         spin_unlock(&oi->ip_lock);
1396         /* Update inode ctime */
1397         inode->i_ctime = CURRENT_TIME;
1398         di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1399         di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1400
1401         ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1402         if (ret < 0)
1403                 mlog_errno(ret);
1404
1405 out_commit:
1406         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1407
1408         if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1409                 /*
1410                  * Set value outside in B tree.
1411                  * This is the second step for value size > INLINE_SIZE.
1412                  */
1413                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1414                 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
1415                 if (ret < 0) {
1416                         int ret2;
1417
1418                         mlog_errno(ret);
1419                         /*
1420                          * If set value outside failed, we have to clean
1421                          * the junk tree root we have already set in local.
1422                          */
1423                         ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
1424                         if (ret2 < 0)
1425                                 mlog_errno(ret2);
1426                 }
1427         }
1428 out:
1429         return ret;
1430
1431 }
1432
1433 static int ocfs2_remove_value_outside(struct inode*inode,
1434                                       struct buffer_head *bh,
1435                                       struct ocfs2_xattr_header *header)
1436 {
1437         int ret = 0, i;
1438
1439         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1440                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1441
1442                 if (!ocfs2_xattr_is_local(entry)) {
1443                         struct ocfs2_xattr_value_root *xv;
1444                         void *val;
1445
1446                         val = (void *)header +
1447                                 le16_to_cpu(entry->xe_name_offset);
1448                         xv = (struct ocfs2_xattr_value_root *)
1449                                 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1450                         ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
1451                         if (ret < 0) {
1452                                 mlog_errno(ret);
1453                                 return ret;
1454                         }
1455                 }
1456         }
1457
1458         return ret;
1459 }
1460
1461 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1462                                     struct buffer_head *di_bh)
1463 {
1464
1465         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1466         struct ocfs2_xattr_header *header;
1467         int ret;
1468
1469         header = (struct ocfs2_xattr_header *)
1470                  ((void *)di + inode->i_sb->s_blocksize -
1471                  le16_to_cpu(di->i_xattr_inline_size));
1472
1473         ret = ocfs2_remove_value_outside(inode, di_bh, header);
1474
1475         return ret;
1476 }
1477
1478 static int ocfs2_xattr_block_remove(struct inode *inode,
1479                                     struct buffer_head *blk_bh)
1480 {
1481         struct ocfs2_xattr_block *xb;
1482         int ret = 0;
1483
1484         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1485         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1486                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1487                 ret = ocfs2_remove_value_outside(inode, blk_bh, header);
1488         } else
1489                 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
1490
1491         return ret;
1492 }
1493
1494 static int ocfs2_xattr_free_block(struct inode *inode,
1495                                   u64 block)
1496 {
1497         struct inode *xb_alloc_inode;
1498         struct buffer_head *xb_alloc_bh = NULL;
1499         struct buffer_head *blk_bh = NULL;
1500         struct ocfs2_xattr_block *xb;
1501         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1502         handle_t *handle;
1503         int ret = 0;
1504         u64 blk, bg_blkno;
1505         u16 bit;
1506
1507         ret = ocfs2_read_block(osb, block, &blk_bh,
1508                                OCFS2_BH_CACHED, inode);
1509         if (ret < 0) {
1510                 mlog_errno(ret);
1511                 goto out;
1512         }
1513
1514         /*Verify the signature of xattr block*/
1515         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1516                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1517                 ret = -EFAULT;
1518                 goto out;
1519         }
1520
1521         ret = ocfs2_xattr_block_remove(inode, blk_bh);
1522         if (ret < 0) {
1523                 mlog_errno(ret);
1524                 goto out;
1525         }
1526
1527         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1528         blk = le64_to_cpu(xb->xb_blkno);
1529         bit = le16_to_cpu(xb->xb_suballoc_bit);
1530         bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1531
1532         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1533                                 EXTENT_ALLOC_SYSTEM_INODE,
1534                                 le16_to_cpu(xb->xb_suballoc_slot));
1535         if (!xb_alloc_inode) {
1536                 ret = -ENOMEM;
1537                 mlog_errno(ret);
1538                 goto out;
1539         }
1540         mutex_lock(&xb_alloc_inode->i_mutex);
1541
1542         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1543         if (ret < 0) {
1544                 mlog_errno(ret);
1545                 goto out_mutex;
1546         }
1547
1548         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1549         if (IS_ERR(handle)) {
1550                 ret = PTR_ERR(handle);
1551                 mlog_errno(ret);
1552                 goto out_unlock;
1553         }
1554
1555         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1556                                        bit, bg_blkno, 1);
1557         if (ret < 0)
1558                 mlog_errno(ret);
1559
1560         ocfs2_commit_trans(osb, handle);
1561 out_unlock:
1562         ocfs2_inode_unlock(xb_alloc_inode, 1);
1563         brelse(xb_alloc_bh);
1564 out_mutex:
1565         mutex_unlock(&xb_alloc_inode->i_mutex);
1566         iput(xb_alloc_inode);
1567 out:
1568         brelse(blk_bh);
1569         return ret;
1570 }
1571
1572 /*
1573  * ocfs2_xattr_remove()
1574  *
1575  * Free extended attribute resources associated with this inode.
1576  */
1577 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1578 {
1579         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1580         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1581         handle_t *handle;
1582         int ret;
1583
1584         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1585                 return 0;
1586
1587         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1588                 return 0;
1589
1590         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1591                 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1592                 if (ret < 0) {
1593                         mlog_errno(ret);
1594                         goto out;
1595                 }
1596         }
1597
1598         if (di->i_xattr_loc) {
1599                 ret = ocfs2_xattr_free_block(inode,
1600                                              le64_to_cpu(di->i_xattr_loc));
1601                 if (ret < 0) {
1602                         mlog_errno(ret);
1603                         goto out;
1604                 }
1605         }
1606
1607         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1608                                    OCFS2_INODE_UPDATE_CREDITS);
1609         if (IS_ERR(handle)) {
1610                 ret = PTR_ERR(handle);
1611                 mlog_errno(ret);
1612                 goto out;
1613         }
1614         ret = ocfs2_journal_access(handle, inode, di_bh,
1615                                    OCFS2_JOURNAL_ACCESS_WRITE);
1616         if (ret) {
1617                 mlog_errno(ret);
1618                 goto out_commit;
1619         }
1620
1621         di->i_xattr_loc = 0;
1622
1623         spin_lock(&oi->ip_lock);
1624         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1625         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1626         spin_unlock(&oi->ip_lock);
1627
1628         ret = ocfs2_journal_dirty(handle, di_bh);
1629         if (ret < 0)
1630                 mlog_errno(ret);
1631 out_commit:
1632         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1633 out:
1634         return ret;
1635 }
1636
1637 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1638                                         struct ocfs2_dinode *di)
1639 {
1640         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1641         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1642         int free;
1643
1644         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1645                 return 0;
1646
1647         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1648                 struct ocfs2_inline_data *idata = &di->id2.i_data;
1649                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1650         } else if (ocfs2_inode_is_fast_symlink(inode)) {
1651                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1652                         le64_to_cpu(di->i_size);
1653         } else {
1654                 struct ocfs2_extent_list *el = &di->id2.i_list;
1655                 free = (le16_to_cpu(el->l_count) -
1656                         le16_to_cpu(el->l_next_free_rec)) *
1657                         sizeof(struct ocfs2_extent_rec);
1658         }
1659         if (free >= xattrsize)
1660                 return 1;
1661
1662         return 0;
1663 }
1664
1665 /*
1666  * ocfs2_xattr_ibody_find()
1667  *
1668  * Find extended attribute in inode block and
1669  * fill search info into struct ocfs2_xattr_search.
1670  */
1671 static int ocfs2_xattr_ibody_find(struct inode *inode,
1672                                   int name_index,
1673                                   const char *name,
1674                                   struct ocfs2_xattr_search *xs)
1675 {
1676         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1677         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1678         int ret;
1679         int has_space = 0;
1680
1681         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1682                 return 0;
1683
1684         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1685                 down_read(&oi->ip_alloc_sem);
1686                 has_space = ocfs2_xattr_has_space_inline(inode, di);
1687                 up_read(&oi->ip_alloc_sem);
1688                 if (!has_space)
1689                         return 0;
1690         }
1691
1692         xs->xattr_bh = xs->inode_bh;
1693         xs->end = (void *)di + inode->i_sb->s_blocksize;
1694         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1695                 xs->header = (struct ocfs2_xattr_header *)
1696                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1697         else
1698                 xs->header = (struct ocfs2_xattr_header *)
1699                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1700         xs->base = (void *)xs->header;
1701         xs->here = xs->header->xh_entries;
1702
1703         /* Find the named attribute. */
1704         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1705                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1706                 if (ret && ret != -ENODATA)
1707                         return ret;
1708                 xs->not_found = ret;
1709         }
1710
1711         return 0;
1712 }
1713
1714 /*
1715  * ocfs2_xattr_ibody_set()
1716  *
1717  * Set, replace or remove an extended attribute into inode block.
1718  *
1719  */
1720 static int ocfs2_xattr_ibody_set(struct inode *inode,
1721                                  struct ocfs2_xattr_info *xi,
1722                                  struct ocfs2_xattr_search *xs)
1723 {
1724         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1725         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1726         int ret;
1727
1728         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1729                 return -ENOSPC;
1730
1731         down_write(&oi->ip_alloc_sem);
1732         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1733                 if (!ocfs2_xattr_has_space_inline(inode, di)) {
1734                         ret = -ENOSPC;
1735                         goto out;
1736                 }
1737         }
1738
1739         ret = ocfs2_xattr_set_entry(inode, xi, xs,
1740                                 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
1741 out:
1742         up_write(&oi->ip_alloc_sem);
1743
1744         return ret;
1745 }
1746
1747 /*
1748  * ocfs2_xattr_block_find()
1749  *
1750  * Find extended attribute in external block and
1751  * fill search info into struct ocfs2_xattr_search.
1752  */
1753 static int ocfs2_xattr_block_find(struct inode *inode,
1754                                   int name_index,
1755                                   const char *name,
1756                                   struct ocfs2_xattr_search *xs)
1757 {
1758         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1759         struct buffer_head *blk_bh = NULL;
1760         struct ocfs2_xattr_block *xb;
1761         int ret = 0;
1762
1763         if (!di->i_xattr_loc)
1764                 return ret;
1765
1766         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1767                                le64_to_cpu(di->i_xattr_loc),
1768                                &blk_bh, OCFS2_BH_CACHED, inode);
1769         if (ret < 0) {
1770                 mlog_errno(ret);
1771                 return ret;
1772         }
1773         /*Verify the signature of xattr block*/
1774         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1775                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1776                         ret = -EFAULT;
1777                         goto cleanup;
1778         }
1779
1780         xs->xattr_bh = blk_bh;
1781         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1782
1783         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1784                 xs->header = &xb->xb_attrs.xb_header;
1785                 xs->base = (void *)xs->header;
1786                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
1787                 xs->here = xs->header->xh_entries;
1788
1789                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1790         } else
1791                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
1792                                                    name_index,
1793                                                    name, xs);
1794
1795         if (ret && ret != -ENODATA) {
1796                 xs->xattr_bh = NULL;
1797                 goto cleanup;
1798         }
1799         xs->not_found = ret;
1800         return 0;
1801 cleanup:
1802         brelse(blk_bh);
1803
1804         return ret;
1805 }
1806
1807 /*
1808  * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
1809  * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
1810  * re-initialized.
1811  */
1812 static int ocfs2_restore_xattr_block(struct inode *inode,
1813                                      struct ocfs2_xattr_search *xs)
1814 {
1815         int ret;
1816         handle_t *handle;
1817         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1818         struct ocfs2_xattr_block *xb =
1819                 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1820         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
1821         u16 xb_flags = le16_to_cpu(xb->xb_flags);
1822
1823         BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
1824                 le16_to_cpu(el->l_next_free_rec) != 0);
1825
1826         handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1827         if (IS_ERR(handle)) {
1828                 ret = PTR_ERR(handle);
1829                 handle = NULL;
1830                 goto out;
1831         }
1832
1833         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1834                                    OCFS2_JOURNAL_ACCESS_WRITE);
1835         if (ret < 0) {
1836                 mlog_errno(ret);
1837                 goto out_commit;
1838         }
1839
1840         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
1841                offsetof(struct ocfs2_xattr_block, xb_attrs));
1842
1843         xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);
1844
1845         ocfs2_journal_dirty(handle, xs->xattr_bh);
1846
1847 out_commit:
1848         ocfs2_commit_trans(osb, handle);
1849 out:
1850         return ret;
1851 }
1852
1853 /*
1854  * ocfs2_xattr_block_set()
1855  *
1856  * Set, replace or remove an extended attribute into external block.
1857  *
1858  */
1859 static int ocfs2_xattr_block_set(struct inode *inode,
1860                                  struct ocfs2_xattr_info *xi,
1861                                  struct ocfs2_xattr_search *xs)
1862 {
1863         struct buffer_head *new_bh = NULL;
1864         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1865         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)xs->inode_bh->b_data;
1866         struct ocfs2_alloc_context *meta_ac = NULL;
1867         handle_t *handle = NULL;
1868         struct ocfs2_xattr_block *xblk = NULL;
1869         u16 suballoc_bit_start;
1870         u32 num_got;
1871         u64 first_blkno;
1872         int ret;
1873
1874         if (!xs->xattr_bh) {
1875                 /*
1876                  * Alloc one external block for extended attribute
1877                  * outside of inode.
1878                  */
1879                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
1880                 if (ret < 0) {
1881                         mlog_errno(ret);
1882                         goto out;
1883                 }
1884                 handle = ocfs2_start_trans(osb,
1885                                            OCFS2_XATTR_BLOCK_CREATE_CREDITS);
1886                 if (IS_ERR(handle)) {
1887                         ret = PTR_ERR(handle);
1888                         mlog_errno(ret);
1889                         goto out;
1890                 }
1891                 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1892                                            OCFS2_JOURNAL_ACCESS_CREATE);
1893                 if (ret < 0) {
1894                         mlog_errno(ret);
1895                         goto out_commit;
1896                 }
1897
1898                 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
1899                                            &suballoc_bit_start, &num_got,
1900                                            &first_blkno);
1901                 if (ret < 0) {
1902                         mlog_errno(ret);
1903                         goto out_commit;
1904                 }
1905
1906                 new_bh = sb_getblk(inode->i_sb, first_blkno);
1907                 ocfs2_set_new_buffer_uptodate(inode, new_bh);
1908
1909                 ret = ocfs2_journal_access(handle, inode, new_bh,
1910                                            OCFS2_JOURNAL_ACCESS_CREATE);
1911                 if (ret < 0) {
1912                         mlog_errno(ret);
1913                         goto out_commit;
1914                 }
1915
1916                 /* Initialize ocfs2_xattr_block */
1917                 xs->xattr_bh = new_bh;
1918                 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
1919                 memset(xblk, 0, inode->i_sb->s_blocksize);
1920                 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
1921                 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
1922                 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1923                 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
1924                 xblk->xb_blkno = cpu_to_le64(first_blkno);
1925
1926                 xs->header = &xblk->xb_attrs.xb_header;
1927                 xs->base = (void *)xs->header;
1928                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
1929                 xs->here = xs->header->xh_entries;
1930
1931
1932                 ret = ocfs2_journal_dirty(handle, new_bh);
1933                 if (ret < 0) {
1934                         mlog_errno(ret);
1935                         goto out_commit;
1936                 }
1937                 di->i_xattr_loc = cpu_to_le64(first_blkno);
1938                 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1939                 if (ret < 0)
1940                         mlog_errno(ret);
1941 out_commit:
1942                 ocfs2_commit_trans(osb, handle);
1943 out:
1944                 if (meta_ac)
1945                         ocfs2_free_alloc_context(meta_ac);
1946                 if (ret < 0)
1947                         return ret;
1948         } else
1949                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1950
1951         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
1952                 /* Set extended attribute into external block */
1953                 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
1954                 if (!ret || ret != -ENOSPC)
1955                         goto end;
1956
1957                 ret = ocfs2_xattr_create_index_block(inode, xs);
1958                 if (ret)
1959                         goto end;
1960         }
1961
1962         ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
1963         if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
1964                 ret = ocfs2_restore_xattr_block(inode, xs);
1965
1966 end:
1967
1968         return ret;
1969 }
1970
1971 /*
1972  * ocfs2_xattr_set()
1973  *
1974  * Set, replace or remove an extended attribute for this inode.
1975  * value is NULL to remove an existing extended attribute, else either
1976  * create or replace an extended attribute.
1977  */
1978 int ocfs2_xattr_set(struct inode *inode,
1979                     int name_index,
1980                     const char *name,
1981                     const void *value,
1982                     size_t value_len,
1983                     int flags)
1984 {
1985         struct buffer_head *di_bh = NULL;
1986         struct ocfs2_dinode *di;
1987         int ret;
1988         u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
1989
1990         struct ocfs2_xattr_info xi = {
1991                 .name_index = name_index,
1992                 .name = name,
1993                 .value = value,
1994                 .value_len = value_len,
1995         };
1996
1997         struct ocfs2_xattr_search xis = {
1998                 .not_found = -ENODATA,
1999         };
2000
2001         struct ocfs2_xattr_search xbs = {
2002                 .not_found = -ENODATA,
2003         };
2004
2005         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2006                 return -EOPNOTSUPP;
2007
2008         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2009         if (ret < 0) {
2010                 mlog_errno(ret);
2011                 return ret;
2012         }
2013         xis.inode_bh = xbs.inode_bh = di_bh;
2014         di = (struct ocfs2_dinode *)di_bh->b_data;
2015
2016         down_write(&OCFS2_I(inode)->ip_xattr_sem);
2017         /*
2018          * Scan inode and external block to find the same name
2019          * extended attribute and collect search infomation.
2020          */
2021         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2022         if (ret)
2023                 goto cleanup;
2024         if (xis.not_found) {
2025                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2026                 if (ret)
2027                         goto cleanup;
2028         }
2029
2030         if (xis.not_found && xbs.not_found) {
2031                 ret = -ENODATA;
2032                 if (flags & XATTR_REPLACE)
2033                         goto cleanup;
2034                 ret = 0;
2035                 if (!value)
2036                         goto cleanup;
2037         } else {
2038                 ret = -EEXIST;
2039                 if (flags & XATTR_CREATE)
2040                         goto cleanup;
2041         }
2042
2043         if (!value) {
2044                 /* Remove existing extended attribute */
2045                 if (!xis.not_found)
2046                         ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2047                 else if (!xbs.not_found)
2048                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2049         } else {
2050                 /* We always try to set extended attribute into inode first*/
2051                 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2052                 if (!ret && !xbs.not_found) {
2053                         /*
2054                          * If succeed and that extended attribute existing in
2055                          * external block, then we will remove it.
2056                          */
2057                         xi.value = NULL;
2058                         xi.value_len = 0;
2059                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2060                 } else if (ret == -ENOSPC) {
2061                         if (di->i_xattr_loc && !xbs.xattr_bh) {
2062                                 ret = ocfs2_xattr_block_find(inode, name_index,
2063                                                              name, &xbs);
2064                                 if (ret)
2065                                         goto cleanup;
2066                         }
2067                         /*
2068                          * If no space in inode, we will set extended attribute
2069                          * into external block.
2070                          */
2071                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2072                         if (ret)
2073                                 goto cleanup;
2074                         if (!xis.not_found) {
2075                                 /*
2076                                  * If succeed and that extended attribute
2077                                  * existing in inode, we will remove it.
2078                                  */
2079                                 xi.value = NULL;
2080                                 xi.value_len = 0;
2081                                 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2082                         }
2083                 }
2084         }
2085 cleanup:
2086         up_write(&OCFS2_I(inode)->ip_xattr_sem);
2087         ocfs2_inode_unlock(inode, 1);
2088         brelse(di_bh);
2089         brelse(xbs.xattr_bh);
2090         for (i = 0; i < blk_per_bucket; i++)
2091                 brelse(xbs.bucket.bhs[i]);
2092
2093         return ret;
2094 }
2095
2096 static inline u32 ocfs2_xattr_hash_by_name(struct inode *inode,
2097                                            int name_index,
2098                                            const char *suffix_name)
2099 {
2100         struct xattr_handler *handler = ocfs2_xattr_handler(name_index);
2101         char *prefix = handler->prefix;
2102         int prefix_len = strlen(handler->prefix);
2103
2104         return ocfs2_xattr_name_hash(inode, prefix, prefix_len,
2105                                      (char *)suffix_name, strlen(suffix_name));
2106 }
2107
2108 /*
2109  * Find the xattr extent rec which may contains name_hash.
2110  * e_cpos will be the first name hash of the xattr rec.
2111  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2112  */
2113 static int ocfs2_xattr_get_rec(struct inode *inode,
2114                                u32 name_hash,
2115                                u64 *p_blkno,
2116                                u32 *e_cpos,
2117                                u32 *num_clusters,
2118                                struct ocfs2_extent_list *el)
2119 {
2120         int ret = 0, i;
2121         struct buffer_head *eb_bh = NULL;
2122         struct ocfs2_extent_block *eb;
2123         struct ocfs2_extent_rec *rec = NULL;
2124         u64 e_blkno = 0;
2125
2126         if (el->l_tree_depth) {
2127                 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2128                 if (ret) {
2129                         mlog_errno(ret);
2130                         goto out;
2131                 }
2132
2133                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2134                 el = &eb->h_list;
2135
2136                 if (el->l_tree_depth) {
2137                         ocfs2_error(inode->i_sb,
2138                                     "Inode %lu has non zero tree depth in "
2139                                     "xattr tree block %llu\n", inode->i_ino,
2140                                     (unsigned long long)eb_bh->b_blocknr);
2141                         ret = -EROFS;
2142                         goto out;
2143                 }
2144         }
2145
2146         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2147                 rec = &el->l_recs[i];
2148
2149                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2150                         e_blkno = le64_to_cpu(rec->e_blkno);
2151                         break;
2152                 }
2153         }
2154
2155         if (!e_blkno) {
2156                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2157                             "record (%u, %u, 0) in xattr", inode->i_ino,
2158                             le32_to_cpu(rec->e_cpos),
2159                             ocfs2_rec_clusters(el, rec));
2160                 ret = -EROFS;
2161                 goto out;
2162         }
2163
2164         *p_blkno = le64_to_cpu(rec->e_blkno);
2165         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2166         if (e_cpos)
2167                 *e_cpos = le32_to_cpu(rec->e_cpos);
2168 out:
2169         brelse(eb_bh);
2170         return ret;
2171 }
2172
2173 typedef int (xattr_bucket_func)(struct inode *inode,
2174                                 struct ocfs2_xattr_bucket *bucket,
2175                                 void *para);
2176
2177 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2178                                    struct buffer_head *header_bh,
2179                                    int name_index,
2180                                    const char *name,
2181                                    u32 name_hash,
2182                                    u16 *xe_index,
2183                                    int *found)
2184 {
2185         int i, ret = 0, cmp = 1, block_off, new_offset;
2186         struct ocfs2_xattr_header *xh =
2187                         (struct ocfs2_xattr_header *)header_bh->b_data;
2188         size_t name_len = strlen(name);
2189         struct ocfs2_xattr_entry *xe = NULL;
2190         struct buffer_head *name_bh = NULL;
2191         char *xe_name;
2192
2193         /*
2194          * We don't use binary search in the bucket because there
2195          * may be multiple entries with the same name hash.
2196          */
2197         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2198                 xe = &xh->xh_entries[i];
2199
2200                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2201                         continue;
2202                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2203                         break;
2204
2205                 cmp = name_index - ocfs2_xattr_get_type(xe);
2206                 if (!cmp)
2207                         cmp = name_len - xe->xe_name_len;
2208                 if (cmp)
2209                         continue;
2210
2211                 ret = ocfs2_xattr_bucket_get_name_value(inode,
2212                                                         xh,
2213                                                         i,
2214                                                         &block_off,
2215                                                         &new_offset);
2216                 if (ret) {
2217                         mlog_errno(ret);
2218                         break;
2219                 }
2220
2221                 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
2222                                        header_bh->b_blocknr + block_off,
2223                                        &name_bh, OCFS2_BH_CACHED, inode);
2224                 if (ret) {
2225                         mlog_errno(ret);
2226                         break;
2227                 }
2228                 xe_name = name_bh->b_data + new_offset;
2229
2230                 cmp = memcmp(name, xe_name, name_len);
2231                 brelse(name_bh);
2232                 name_bh = NULL;
2233
2234                 if (cmp == 0) {
2235                         *xe_index = i;
2236                         *found = 1;
2237                         ret = 0;
2238                         break;
2239                 }
2240         }
2241
2242         return ret;
2243 }
2244
2245 /*
2246  * Find the specified xattr entry in a series of buckets.
2247  * This series start from p_blkno and last for num_clusters.
2248  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2249  * the num of the valid buckets.
2250  *
2251  * Return the buffer_head this xattr should reside in. And if the xattr's
2252  * hash is in the gap of 2 buckets, return the lower bucket.
2253  */
2254 static int ocfs2_xattr_bucket_find(struct inode *inode,
2255                                    int name_index,
2256                                    const char *name,
2257                                    u32 name_hash,
2258                                    u64 p_blkno,
2259                                    u32 first_hash,
2260                                    u32 num_clusters,
2261                                    struct ocfs2_xattr_search *xs)
2262 {
2263         int ret, found = 0;
2264         struct buffer_head *bh = NULL;
2265         struct buffer_head *lower_bh = NULL;
2266         struct ocfs2_xattr_header *xh = NULL;
2267         struct ocfs2_xattr_entry *xe = NULL;
2268         u16 index = 0;
2269         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2270         int low_bucket = 0, bucket, high_bucket;
2271         u32 last_hash;
2272         u64 blkno;
2273
2274         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno,
2275                                &bh, OCFS2_BH_CACHED, inode);
2276         if (ret) {
2277                 mlog_errno(ret);
2278                 goto out;
2279         }
2280
2281         xh = (struct ocfs2_xattr_header *)bh->b_data;
2282         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2283
2284         while (low_bucket <= high_bucket) {
2285                 brelse(bh);
2286                 bh = NULL;
2287                 bucket = (low_bucket + high_bucket) / 2;
2288
2289                 blkno = p_blkno + bucket * blk_per_bucket;
2290
2291                 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
2292                                        &bh, OCFS2_BH_CACHED, inode);
2293                 if (ret) {
2294                         mlog_errno(ret);
2295                         goto out;
2296                 }
2297
2298                 xh = (struct ocfs2_xattr_header *)bh->b_data;
2299                 xe = &xh->xh_entries[0];
2300                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
2301                         high_bucket = bucket - 1;
2302                         continue;
2303                 }
2304
2305                 /*
2306                  * Check whether the hash of the last entry in our
2307                  * bucket is larger than the search one. for an empty
2308                  * bucket, the last one is also the first one.
2309                  */
2310                 if (xh->xh_count)
2311                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
2312
2313                 last_hash = le32_to_cpu(xe->xe_name_hash);
2314
2315                 /* record lower_bh which may be the insert place. */
2316                 brelse(lower_bh);
2317                 lower_bh = bh;
2318                 bh = NULL;
2319
2320                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
2321                         low_bucket = bucket + 1;
2322                         continue;
2323                 }
2324
2325                 /* the searched xattr should reside in this bucket if exists. */
2326                 ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
2327                                               name_index, name, name_hash,
2328                                               &index, &found);
2329                 if (ret) {
2330                         mlog_errno(ret);
2331                         goto out;
2332                 }
2333                 break;
2334         }
2335
2336         /*
2337          * Record the bucket we have found.
2338          * When the xattr's hash value is in the gap of 2 buckets, we will
2339          * always set it to the previous bucket.
2340          */
2341         if (!lower_bh) {
2342                 /*
2343                  * We can't find any bucket whose first name_hash is less
2344                  * than the find name_hash.
2345                  */
2346                 BUG_ON(bh->b_blocknr != p_blkno);
2347                 lower_bh = bh;
2348                 bh = NULL;
2349         }
2350         xs->bucket.bhs[0] = lower_bh;
2351         xs->bucket.xh = (struct ocfs2_xattr_header *)
2352                                         xs->bucket.bhs[0]->b_data;
2353         lower_bh = NULL;
2354
2355         xs->header = xs->bucket.xh;
2356         xs->base = xs->bucket.bhs[0]->b_data;
2357         xs->end = xs->base + inode->i_sb->s_blocksize;
2358
2359         if (found) {
2360                 /*
2361                  * If we have found the xattr enty, read all the blocks in
2362                  * this bucket.
2363                  */
2364                 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2365                                         xs->bucket.bhs[0]->b_blocknr + 1,
2366                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
2367                                         OCFS2_BH_CACHED, inode);
2368                 if (ret) {
2369                         mlog_errno(ret);
2370                         goto out;
2371                 }
2372
2373                 xs->here = &xs->header->xh_entries[index];
2374                 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
2375                      (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
2376         } else
2377                 ret = -ENODATA;
2378
2379 out:
2380         brelse(bh);
2381         brelse(lower_bh);
2382         return ret;
2383 }
2384
2385 static int ocfs2_xattr_index_block_find(struct inode *inode,
2386                                         struct buffer_head *root_bh,
2387                                         int name_index,
2388                                         const char *name,
2389                                         struct ocfs2_xattr_search *xs)
2390 {
2391         int ret;
2392         struct ocfs2_xattr_block *xb =
2393                         (struct ocfs2_xattr_block *)root_bh->b_data;
2394         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
2395         struct ocfs2_extent_list *el = &xb_root->xt_list;
2396         u64 p_blkno = 0;
2397         u32 first_hash, num_clusters = 0;
2398         u32 name_hash = ocfs2_xattr_hash_by_name(inode, name_index, name);
2399
2400         if (le16_to_cpu(el->l_next_free_rec) == 0)
2401                 return -ENODATA;
2402
2403         mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
2404              name, name_hash, name_index);
2405
2406         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
2407                                   &num_clusters, el);
2408         if (ret) {
2409                 mlog_errno(ret);
2410                 goto out;
2411         }
2412
2413         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
2414
2415         mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
2416              "in the rec is %u\n", num_clusters, p_blkno, first_hash);
2417
2418         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
2419                                       p_blkno, first_hash, num_clusters, xs);
2420
2421 out:
2422         return ret;
2423 }
2424
2425 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
2426                                        u64 blkno,
2427                                        u32 clusters,
2428                                        xattr_bucket_func *func,
2429                                        void *para)
2430 {
2431         int i, j, ret = 0;
2432         int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2433         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
2434         u32 num_buckets = clusters * bpc;
2435         struct ocfs2_xattr_bucket bucket;
2436
2437         memset(&bucket, 0, sizeof(bucket));
2438
2439         mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
2440              clusters, blkno);
2441
2442         for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
2443                 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2444                                         blkno, blk_per_bucket,
2445                                         bucket.bhs, OCFS2_BH_CACHED, inode);
2446                 if (ret) {
2447                         mlog_errno(ret);
2448                         goto out;
2449                 }
2450
2451                 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
2452                 /*
2453                  * The real bucket num in this series of blocks is stored
2454                  * in the 1st bucket.
2455                  */
2456                 if (i == 0)
2457                         num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
2458
2459                 mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno,
2460                      le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash));
2461                 if (func) {
2462                         ret = func(inode, &bucket, para);
2463                         if (ret) {
2464                                 mlog_errno(ret);
2465                                 break;
2466                         }
2467                 }
2468
2469                 for (j = 0; j < blk_per_bucket; j++)
2470                         brelse(bucket.bhs[j]);
2471                 memset(&bucket, 0, sizeof(bucket));
2472         }
2473
2474 out:
2475         for (j = 0; j < blk_per_bucket; j++)
2476                 brelse(bucket.bhs[j]);
2477
2478         return ret;
2479 }
2480
2481 struct ocfs2_xattr_tree_list {
2482         char *buffer;
2483         size_t buffer_size;
2484 };
2485
2486 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
2487                                              struct ocfs2_xattr_header *xh,
2488                                              int index,
2489                                              int *block_off,
2490                                              int *new_offset)
2491 {
2492         u16 name_offset;
2493
2494         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
2495                 return -EINVAL;
2496
2497         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
2498
2499         *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
2500         *new_offset = name_offset % inode->i_sb->s_blocksize;
2501
2502         return 0;
2503 }
2504
2505 static int ocfs2_list_xattr_bucket(struct inode *inode,
2506                                    struct ocfs2_xattr_bucket *bucket,
2507                                    void *para)
2508 {
2509         int ret = 0;
2510         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
2511         size_t size;
2512         int i, block_off, new_offset;
2513
2514         for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
2515                 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
2516                 struct xattr_handler *handler =
2517                         ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
2518
2519                 if (handler) {
2520                         ret = ocfs2_xattr_bucket_get_name_value(inode,
2521                                                                 bucket->xh,
2522                                                                 i,
2523                                                                 &block_off,
2524                                                                 &new_offset);
2525                         if (ret)
2526                                 break;
2527                         size = handler->list(inode, xl->buffer, xl->buffer_size,
2528                                              bucket->bhs[block_off]->b_data +
2529                                              new_offset,
2530                                              entry->xe_name_len);
2531                         if (xl->buffer) {
2532                                 if (size > xl->buffer_size)
2533                                         return -ERANGE;
2534                                 xl->buffer += size;
2535                         }
2536                         xl->buffer_size -= size;
2537                 }
2538         }
2539
2540         return ret;
2541 }
2542
2543 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
2544                                              struct ocfs2_xattr_tree_root *xt,
2545                                              char *buffer,
2546                                              size_t buffer_size)
2547 {
2548         struct ocfs2_extent_list *el = &xt->xt_list;
2549         int ret = 0;
2550         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
2551         u64 p_blkno = 0;
2552         struct ocfs2_xattr_tree_list xl = {
2553                 .buffer = buffer,
2554                 .buffer_size = buffer_size,
2555         };
2556
2557         if (le16_to_cpu(el->l_next_free_rec) == 0)
2558                 return 0;
2559
2560         while (name_hash > 0) {
2561                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
2562                                           &e_cpos, &num_clusters, el);
2563                 if (ret) {
2564                         mlog_errno(ret);
2565                         goto out;
2566                 }
2567
2568                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
2569                                                   ocfs2_list_xattr_bucket,
2570                                                   &xl);
2571                 if (ret) {
2572                         mlog_errno(ret);
2573                         goto out;
2574                 }
2575
2576                 if (e_cpos == 0)
2577                         break;
2578
2579                 name_hash = e_cpos - 1;
2580         }
2581
2582         ret = buffer_size - xl.buffer_size;
2583 out:
2584         return ret;
2585 }
2586
2587 static int cmp_xe(const void *a, const void *b)
2588 {
2589         const struct ocfs2_xattr_entry *l = a, *r = b;
2590         u32 l_hash = le32_to_cpu(l->xe_name_hash);
2591         u32 r_hash = le32_to_cpu(r->xe_name_hash);
2592
2593         if (l_hash > r_hash)
2594                 return 1;
2595         if (l_hash < r_hash)
2596                 return -1;
2597         return 0;
2598 }
2599
2600 static void swap_xe(void *a, void *b, int size)
2601 {
2602         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
2603
2604         tmp = *l;
2605         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
2606         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
2607 }
2608
2609 /*
2610  * When the ocfs2_xattr_block is filled up, new bucket will be created
2611  * and all the xattr entries will be moved to the new bucket.
2612  * Note: we need to sort the entries since they are not saved in order
2613  * in the ocfs2_xattr_block.
2614  */
2615 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
2616                                            struct buffer_head *xb_bh,
2617                                            struct buffer_head *xh_bh,
2618                                            struct buffer_head *data_bh)
2619 {
2620         int i, blocksize = inode->i_sb->s_blocksize;
2621         u16 offset, size, off_change;
2622         struct ocfs2_xattr_entry *xe;
2623         struct ocfs2_xattr_block *xb =
2624                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
2625         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
2626         struct ocfs2_xattr_header *xh =
2627                                 (struct ocfs2_xattr_header *)xh_bh->b_data;
2628         u16 count = le16_to_cpu(xb_xh->xh_count);
2629         char *target = xh_bh->b_data, *src = xb_bh->b_data;
2630
2631         mlog(0, "cp xattr from block %llu to bucket %llu\n",
2632              (unsigned long long)xb_bh->b_blocknr,
2633              (unsigned long long)xh_bh->b_blocknr);
2634
2635         memset(xh_bh->b_data, 0, blocksize);
2636         if (data_bh)
2637                 memset(data_bh->b_data, 0, blocksize);
2638         /*
2639          * Since the xe_name_offset is based on ocfs2_xattr_header,
2640          * there is a offset change corresponding to the change of
2641          * ocfs2_xattr_header's position.
2642          */
2643         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2644         xe = &xb_xh->xh_entries[count - 1];
2645         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
2646         size = blocksize - offset;
2647
2648         /* copy all the names and values. */
2649         if (data_bh)
2650                 target = data_bh->b_data;
2651         memcpy(target + offset, src + offset, size);
2652
2653         /* Init new header now. */
2654         xh->xh_count = xb_xh->xh_count;
2655         xh->xh_num_buckets = cpu_to_le16(1);
2656         xh->xh_name_value_len = cpu_to_le16(size);
2657         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
2658
2659         /* copy all the entries. */
2660         target = xh_bh->b_data;
2661         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
2662         size = count * sizeof(struct ocfs2_xattr_entry);
2663         memcpy(target + offset, (char *)xb_xh + offset, size);
2664
2665         /* Change the xe offset for all the xe because of the move. */
2666         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
2667                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2668         for (i = 0; i < count; i++)
2669                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
2670
2671         mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
2672              offset, size, off_change);
2673
2674         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
2675              cmp_xe, swap_xe);
2676 }
2677
2678 /*
2679  * After we move xattr from block to index btree, we have to
2680  * update ocfs2_xattr_search to the new xe and base.
2681  *
2682  * When the entry is in xattr block, xattr_bh indicates the storage place.
2683  * While if the entry is in index b-tree, "bucket" indicates the
2684  * real place of the xattr.
2685  */
2686 static int ocfs2_xattr_update_xattr_search(struct inode *inode,
2687                                            struct ocfs2_xattr_search *xs,
2688                                            struct buffer_head *old_bh,
2689                                            struct buffer_head *new_bh)
2690 {
2691         int ret = 0;
2692         char *buf = old_bh->b_data;
2693         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
2694         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
2695         int i, blocksize = inode->i_sb->s_blocksize;
2696         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2697
2698         xs->bucket.bhs[0] = new_bh;
2699         get_bh(new_bh);
2700         xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
2701         xs->header = xs->bucket.xh;
2702
2703         xs->base = new_bh->b_data;
2704         xs->end = xs->base + inode->i_sb->s_blocksize;
2705
2706         if (!xs->not_found) {
2707                 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
2708                         ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2709                                         xs->bucket.bhs[0]->b_blocknr + 1,
2710                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
2711                                         OCFS2_BH_CACHED, inode);
2712                         if (ret) {
2713                                 mlog_errno(ret);
2714                                 return ret;
2715                         }
2716
2717                         i = xs->here - old_xh->xh_entries;
2718                         xs->here = &xs->header->xh_entries[i];
2719                 }
2720         }
2721
2722         return ret;
2723 }
2724
2725 static int ocfs2_xattr_create_index_block(struct inode *inode,
2726                                           struct ocfs2_xattr_search *xs)
2727 {
2728         int ret, credits = OCFS2_SUBALLOC_ALLOC;
2729         u32 bit_off, len;
2730         u64 blkno;
2731         handle_t *handle;
2732         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2733         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2734         struct ocfs2_alloc_context *data_ac;
2735         struct buffer_head *xh_bh = NULL, *data_bh = NULL;
2736         struct buffer_head *xb_bh = xs->xattr_bh;
2737         struct ocfs2_xattr_block *xb =
2738                         (struct ocfs2_xattr_block *)xb_bh->b_data;
2739         struct ocfs2_xattr_tree_root *xr;
2740         u16 xb_flags = le16_to_cpu(xb->xb_flags);
2741         u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2742
2743         mlog(0, "create xattr index block for %llu\n",
2744              (unsigned long long)xb_bh->b_blocknr);
2745
2746         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
2747
2748         ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
2749         if (ret) {
2750                 mlog_errno(ret);
2751                 goto out;
2752         }
2753
2754         /*
2755          * XXX:
2756          * We can use this lock for now, and maybe move to a dedicated mutex
2757          * if performance becomes a problem later.
2758          */
2759         down_write(&oi->ip_alloc_sem);
2760
2761         /*
2762          * 3 more credits, one for xattr block update, one for the 1st block
2763          * of the new xattr bucket and one for the value/data.
2764          */
2765         credits += 3;
2766         handle = ocfs2_start_trans(osb, credits);
2767         if (IS_ERR(handle)) {
2768                 ret = PTR_ERR(handle);
2769                 mlog_errno(ret);
2770                 goto out_sem;
2771         }
2772
2773         ret = ocfs2_journal_access(handle, inode, xb_bh,
2774                                    OCFS2_JOURNAL_ACCESS_WRITE);
2775         if (ret) {
2776                 mlog_errno(ret);
2777                 goto out_commit;
2778         }
2779
2780         ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
2781         if (ret) {
2782                 mlog_errno(ret);
2783                 goto out_commit;
2784         }
2785
2786         /*
2787          * The bucket may spread in many blocks, and
2788          * we will only touch the 1st block and the last block
2789          * in the whole bucket(one for entry and one for data).
2790          */
2791         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
2792
2793         mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
2794
2795         xh_bh = sb_getblk(inode->i_sb, blkno);
2796         if (!xh_bh) {
2797                 ret = -EIO;
2798                 mlog_errno(ret);
2799                 goto out_commit;
2800         }
2801
2802         ocfs2_set_new_buffer_uptodate(inode, xh_bh);
2803
2804         ret = ocfs2_journal_access(handle, inode, xh_bh,
2805                                    OCFS2_JOURNAL_ACCESS_CREATE);
2806         if (ret) {
2807                 mlog_errno(ret);
2808                 goto out_commit;
2809         }
2810
2811         if (bpb > 1) {
2812                 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
2813                 if (!data_bh) {
2814                         ret = -EIO;
2815                         mlog_errno(ret);
2816                         goto out_commit;
2817                 }
2818
2819                 ocfs2_set_new_buffer_uptodate(inode, data_bh);
2820
2821                 ret = ocfs2_journal_access(handle, inode, data_bh,
2822                                            OCFS2_JOURNAL_ACCESS_CREATE);
2823                 if (ret) {
2824                         mlog_errno(ret);
2825                         goto out_commit;
2826                 }
2827         }
2828
2829         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
2830
2831         ocfs2_journal_dirty(handle, xh_bh);
2832         if (data_bh)
2833                 ocfs2_journal_dirty(handle, data_bh);
2834
2835         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
2836
2837         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
2838         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
2839                offsetof(struct ocfs2_xattr_block, xb_attrs));
2840
2841         xr = &xb->xb_attrs.xb_root;
2842         xr->xt_clusters = cpu_to_le32(1);
2843         xr->xt_last_eb_blk = 0;
2844         xr->xt_list.l_tree_depth = 0;
2845         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
2846         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2847
2848         xr->xt_list.l_recs[0].e_cpos = 0;
2849         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
2850         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
2851
2852         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
2853
2854         ret = ocfs2_journal_dirty(handle, xb_bh);
2855         if (ret) {
2856                 mlog_errno(ret);
2857                 goto out_commit;
2858         }
2859
2860 out_commit:
2861         ocfs2_commit_trans(osb, handle);
2862
2863 out_sem:
2864         up_write(&oi->ip_alloc_sem);
2865
2866 out:
2867         if (data_ac)
2868                 ocfs2_free_alloc_context(data_ac);
2869
2870         brelse(xh_bh);
2871         brelse(data_bh);
2872
2873         return ret;
2874 }
2875
2876 static int cmp_xe_offset(const void *a, const void *b)
2877 {
2878         const struct ocfs2_xattr_entry *l = a, *r = b;
2879         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
2880         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
2881
2882         if (l_name_offset < r_name_offset)
2883                 return 1;
2884         if (l_name_offset > r_name_offset)
2885                 return -1;
2886         return 0;
2887 }
2888
2889 /*
2890  * defrag a xattr bucket if we find that the bucket has some
2891  * holes beteen name/value pairs.
2892  * We will move all the name/value pairs to the end of the bucket
2893  * so that we can spare some space for insertion.
2894  */
2895 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
2896                                      struct ocfs2_xattr_bucket *bucket)
2897 {
2898         int ret, i;
2899         size_t end, offset, len, value_len;
2900         struct ocfs2_xattr_header *xh;
2901         char *entries, *buf, *bucket_buf = NULL;
2902         u64 blkno = bucket->bhs[0]->b_blocknr;
2903         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2904         u16 xh_free_start;
2905         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2906         size_t blocksize = inode->i_sb->s_blocksize;
2907         handle_t *handle;
2908         struct buffer_head **bhs;
2909         struct ocfs2_xattr_entry *xe;
2910
2911         bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
2912                         GFP_NOFS);
2913         if (!bhs)
2914                 return -ENOMEM;
2915
2916         ret = ocfs2_read_blocks(osb, blkno, blk_per_bucket, bhs,
2917                                 OCFS2_BH_CACHED, inode);
2918         if (ret)
2919                 goto out;
2920
2921         /*
2922          * In order to make the operation more efficient and generic,
2923          * we copy all the blocks into a contiguous memory and do the
2924          * defragment there, so if anything is error, we will not touch
2925          * the real block.
2926          */
2927         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
2928         if (!bucket_buf) {
2929                 ret = -EIO;
2930                 goto out;
2931         }
2932
2933         buf = bucket_buf;
2934         for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
2935                 memcpy(buf, bhs[i]->b_data, blocksize);
2936
2937         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
2938         if (IS_ERR(handle)) {
2939                 ret = PTR_ERR(handle);
2940                 handle = NULL;
2941                 mlog_errno(ret);
2942                 goto out;
2943         }
2944
2945         for (i = 0; i < blk_per_bucket; i++) {
2946                 ret = ocfs2_journal_access(handle, inode, bhs[i],
2947                                            OCFS2_JOURNAL_ACCESS_WRITE);
2948                 if (ret < 0) {
2949                         mlog_errno(ret);
2950                         goto commit;
2951                 }
2952         }
2953
2954         xh = (struct ocfs2_xattr_header *)bucket_buf;
2955         entries = (char *)xh->xh_entries;
2956         xh_free_start = le16_to_cpu(xh->xh_free_start);
2957
2958         mlog(0, "adjust xattr bucket in %llu, count = %u, "
2959              "xh_free_start = %u, xh_name_value_len = %u.\n",
2960              blkno, le16_to_cpu(xh->xh_count), xh_free_start,
2961              le16_to_cpu(xh->xh_name_value_len));
2962
2963         /*
2964          * sort all the entries by their offset.
2965          * the largest will be the first, so that we can
2966          * move them to the end one by one.
2967          */
2968         sort(entries, le16_to_cpu(xh->xh_count),
2969              sizeof(struct ocfs2_xattr_entry),
2970              cmp_xe_offset, swap_xe);
2971
2972         /* Move all name/values to the end of the bucket. */
2973         xe = xh->xh_entries;
2974         end = OCFS2_XATTR_BUCKET_SIZE;
2975         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
2976                 offset = le16_to_cpu(xe->xe_name_offset);
2977                 if (ocfs2_xattr_is_local(xe))
2978                         value_len = OCFS2_XATTR_SIZE(
2979                                         le64_to_cpu(xe->xe_value_size));
2980                 else
2981                         value_len = OCFS2_XATTR_ROOT_SIZE;
2982                 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
2983
2984                 /*
2985                  * We must make sure that the name/value pair
2986                  * exist in the same block. So adjust end to
2987                  * the previous block end if needed.
2988                  */
2989                 if (((end - len) / blocksize !=
2990                         (end - 1) / blocksize))
2991                         end = end - end % blocksize;
2992
2993                 if (end > offset + len) {
2994                         memmove(bucket_buf + end - len,
2995                                 bucket_buf + offset, len);
2996                         xe->xe_name_offset = cpu_to_le16(end - len);
2997                 }
2998
2999                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
3000                                 "bucket %llu\n", (unsigned long long)blkno);
3001
3002                 end -= len;
3003         }
3004
3005         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
3006                         "bucket %llu\n", (unsigned long long)blkno);
3007
3008         if (xh_free_start == end)
3009                 goto commit;
3010
3011         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
3012         xh->xh_free_start = cpu_to_le16(end);
3013
3014         /* sort the entries by their name_hash. */
3015         sort(entries, le16_to_cpu(xh->xh_count),
3016              sizeof(struct ocfs2_xattr_entry),
3017              cmp_xe, swap_xe);
3018
3019         buf = bucket_buf;
3020         for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
3021                 memcpy(bhs[i]->b_data, buf, blocksize);
3022                 ocfs2_journal_dirty(handle, bhs[i]);
3023         }
3024
3025 commit:
3026         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3027 out:
3028
3029         if (bhs) {
3030                 for (i = 0; i < blk_per_bucket; i++)
3031                         brelse(bhs[i]);
3032         }
3033         kfree(bhs);
3034
3035         kfree(bucket_buf);
3036         return ret;
3037 }
3038
3039 /*
3040  * Move half nums of the xattr bucket in the previous cluster to this new
3041  * cluster. We only touch the last cluster of the previous extend record.
3042  *
3043  * first_bh is the first buffer_head of a series of bucket in the same
3044  * extent rec and header_bh is the header of one bucket in this cluster.
3045  * They will be updated if we move the data header_bh contains to the new
3046  * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
3047  */
3048 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3049                                                handle_t *handle,
3050                                                struct buffer_head **first_bh,
3051                                                struct buffer_head **header_bh,
3052                                                u64 new_blkno,
3053                                                u64 prev_blkno,
3054                                                u32 num_clusters,
3055                                                u32 *first_hash)
3056 {
3057         int i, ret, credits;
3058         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3059         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3060         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3061         int blocksize = inode->i_sb->s_blocksize;
3062         struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
3063         struct ocfs2_xattr_header *new_xh;
3064         struct ocfs2_xattr_header *xh =
3065                         (struct ocfs2_xattr_header *)((*first_bh)->b_data);
3066
3067         BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
3068         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
3069
3070         prev_bh = *first_bh;
3071         get_bh(prev_bh);
3072         xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
3073
3074         prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
3075
3076         mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3077              prev_blkno, new_blkno);
3078
3079         /*
3080          * We need to update the 1st half of the new cluster and
3081          * 1 more for the update of the 1st bucket of the previous
3082          * extent record.
3083          */
3084         credits = bpc / 2 + 1;
3085         ret = ocfs2_extend_trans(handle, credits);
3086         if (ret) {
3087                 mlog_errno(ret);
3088                 goto out;
3089         }
3090
3091         ret = ocfs2_journal_access(handle, inode, prev_bh,
3092                                    OCFS2_JOURNAL_ACCESS_WRITE);
3093         if (ret) {
3094                 mlog_errno(ret);
3095                 goto out;
3096         }
3097
3098         for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
3099                 old_bh = new_bh = NULL;
3100                 new_bh = sb_getblk(inode->i_sb, new_blkno);
3101                 if (!new_bh) {
3102                         ret = -EIO;
3103                         mlog_errno(ret);
3104                         goto out;
3105                 }
3106
3107                 ocfs2_set_new_buffer_uptodate(inode, new_bh);
3108
3109                 ret = ocfs2_journal_access(handle, inode, new_bh,
3110                                            OCFS2_JOURNAL_ACCESS_CREATE);
3111                 if (ret < 0) {
3112                         mlog_errno(ret);
3113                         brelse(new_bh);
3114                         goto out;
3115                 }
3116
3117                 ret = ocfs2_read_block(osb, prev_blkno,
3118                                        &old_bh, OCFS2_BH_CACHED, inode);
3119                 if (ret < 0) {
3120                         mlog_errno(ret);
3121                         brelse(new_bh);
3122                         goto out;
3123                 }
3124
3125                 memcpy(new_bh->b_data, old_bh->b_data, blocksize);
3126
3127                 if (i == 0) {
3128                         new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
3129                         new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
3130
3131                         if (first_hash)
3132                                 *first_hash = le32_to_cpu(
3133                                         new_xh->xh_entries[0].xe_name_hash);
3134                         new_first_bh = new_bh;
3135                         get_bh(new_first_bh);
3136                 }
3137
3138                 ocfs2_journal_dirty(handle, new_bh);
3139
3140                 if (*header_bh == old_bh) {
3141                         brelse(*header_bh);
3142                         *header_bh = new_bh;
3143                         get_bh(*header_bh);
3144
3145                         brelse(*first_bh);
3146                         *first_bh = new_first_bh;
3147                         get_bh(*first_bh);
3148                 }
3149                 brelse(new_bh);
3150                 brelse(old_bh);
3151         }
3152
3153         le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
3154
3155         ocfs2_journal_dirty(handle, prev_bh);
3156 out:
3157         brelse(prev_bh);
3158         brelse(new_first_bh);
3159         return ret;
3160 }
3161
3162 static int ocfs2_read_xattr_bucket(struct inode *inode,
3163                                    u64 blkno,
3164                                    struct buffer_head **bhs,
3165                                    int new)
3166 {
3167         int ret = 0;
3168         u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3169
3170         if (!new)
3171                 return ocfs2_read_blocks(OCFS2_SB(inode->i_sb), blkno,
3172                                          blk_per_bucket, bhs,
3173                                          OCFS2_BH_CACHED, inode);
3174
3175         for (i = 0; i < blk_per_bucket; i++) {
3176                 bhs[i] = sb_getblk(inode->i_sb, blkno + i);
3177                 if (bhs[i] == NULL) {
3178                         ret = -EIO;
3179                         mlog_errno(ret);
3180                         break;
3181                 }
3182                 ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
3183         }
3184
3185         return ret;
3186 }
3187
3188 /*
3189  * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
3190  * first_hash will record the 1st hash of the new bucket.
3191  */
3192 static int ocfs2_half_xattr_bucket(struct inode *inode,
3193                                    handle_t *handle,
3194                                    u64 blk,
3195                                    u64 new_blk,
3196                                    u32 *first_hash,
3197                                    int new_bucket_head)
3198 {
3199         int ret, i;
3200         u16 count, start, len, name_value_len, xe_len, name_offset;
3201         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3202         struct buffer_head **s_bhs, **t_bhs = NULL;
3203         struct ocfs2_xattr_header *xh;
3204         struct ocfs2_xattr_entry *xe;
3205         int blocksize = inode->i_sb->s_blocksize;
3206
3207         mlog(0, "move half of xattrs from bucket %llu to %llu\n",
3208              blk, new_blk);
3209
3210         s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3211         if (!s_bhs)
3212                 return -ENOMEM;
3213
3214         ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
3215         if (ret) {
3216                 mlog_errno(ret);
3217                 goto out;
3218         }
3219
3220         ret = ocfs2_journal_access(handle, inode, s_bhs[0],
3221                                    OCFS2_JOURNAL_ACCESS_WRITE);
3222         if (ret) {
3223                 mlog_errno(ret);
3224                 goto out;
3225         }
3226
3227         t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3228         if (!t_bhs) {
3229                 ret = -ENOMEM;
3230                 goto out;
3231         }
3232
3233         ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
3234         if (ret) {
3235                 mlog_errno(ret);
3236                 goto out;
3237         }
3238
3239         for (i = 0; i < blk_per_bucket; i++) {
3240                 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3241                                            OCFS2_JOURNAL_ACCESS_CREATE);
3242                 if (ret) {
3243                         mlog_errno(ret);
3244                         goto out;
3245                 }
3246         }
3247
3248         /* copy the whole bucket to the new first. */
3249         for (i = 0; i < blk_per_bucket; i++)
3250                 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3251
3252         /* update the new bucket. */
3253         xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
3254         count = le16_to_cpu(xh->xh_count);
3255         start = count / 2;
3256
3257         /*
3258          * Calculate the total name/value len and xh_free_start for
3259          * the old bucket first.
3260          */
3261         name_offset = OCFS2_XATTR_BUCKET_SIZE;
3262         name_value_len = 0;
3263         for (i = 0; i < start; i++) {
3264                 xe = &xh->xh_entries[i];
3265                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3266                 if (ocfs2_xattr_is_local(xe))
3267                         xe_len +=
3268                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3269                 else
3270                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3271                 name_value_len += xe_len;
3272                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3273                         name_offset = le16_to_cpu(xe->xe_name_offset);
3274         }
3275
3276         /*
3277          * Now begin the modification to the new bucket.
3278          *
3279          * In the new bucket, We just move the xattr entry to the beginning
3280          * and don't touch the name/value. So there will be some holes in the
3281          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3282          * called.
3283          */
3284         xe = &xh->xh_entries[start];
3285         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3286         mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3287              (int)((char *)xe - (char *)xh),
3288              (int)((char *)xh->xh_entries - (char *)xh));
3289         memmove((char *)xh->xh_entries, (char *)xe, len);
3290         xe = &xh->xh_entries[count - start];
3291         len = sizeof(struct ocfs2_xattr_entry) * start;
3292         memset((char *)xe, 0, len);
3293
3294         le16_add_cpu(&xh->xh_count, -start);
3295         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3296
3297         /* Calculate xh_free_start for the new bucket. */
3298         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3299         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3300                 xe = &xh->xh_entries[i];
3301                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3302                 if (ocfs2_xattr_is_local(xe))
3303                         xe_len +=
3304                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3305                 else
3306                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3307                 if (le16_to_cpu(xe->xe_name_offset) <
3308                     le16_to_cpu(xh->xh_free_start))
3309                         xh->xh_free_start = xe->xe_name_offset;
3310         }
3311
3312         /* set xh->xh_num_buckets for the new xh. */
3313         if (new_bucket_head)
3314                 xh->xh_num_buckets = cpu_to_le16(1);
3315         else
3316                 xh->xh_num_buckets = 0;
3317
3318         for (i = 0; i < blk_per_bucket; i++) {
3319                 ocfs2_journal_dirty(handle, t_bhs[i]);
3320                 if (ret)
3321                         mlog_errno(ret);
3322         }
3323
3324         /* store the first_hash of the new bucket. */
3325         if (first_hash)
3326                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3327
3328         /*
3329          * Now only update the 1st block of the old bucket.
3330          * Please note that the entry has been sorted already above.
3331          */
3332         xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
3333         memset(&xh->xh_entries[start], 0,
3334                sizeof(struct ocfs2_xattr_entry) * (count - start));
3335         xh->xh_count = cpu_to_le16(start);
3336         xh->xh_free_start = cpu_to_le16(name_offset);
3337         xh->xh_name_value_len = cpu_to_le16(name_value_len);
3338
3339         ocfs2_journal_dirty(handle, s_bhs[0]);
3340         if (ret)
3341                 mlog_errno(ret);
3342
3343 out:
3344         if (s_bhs) {
3345                 for (i = 0; i < blk_per_bucket; i++)
3346                         brelse(s_bhs[i]);
3347         }
3348         kfree(s_bhs);
3349
3350         if (t_bhs) {
3351                 for (i = 0; i < blk_per_bucket; i++)
3352                         brelse(t_bhs[i]);
3353         }
3354         kfree(t_bhs);
3355
3356         return ret;
3357 }
3358
3359 /*
3360  * Copy xattr from one bucket to another bucket.
3361  *
3362  * The caller must make sure that the journal transaction
3363  * has enough space for journaling.
3364  */
3365 static int ocfs2_cp_xattr_bucket(struct inode *inode,
3366                                  handle_t *handle,
3367                                  u64 s_blkno,
3368                                  u64 t_blkno,
3369                                  int t_is_new)
3370 {
3371         int ret, i;
3372         int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3373         int blocksize = inode->i_sb->s_blocksize;
3374         struct buffer_head **s_bhs, **t_bhs = NULL;
3375
3376         BUG_ON(s_blkno == t_blkno);
3377
3378         mlog(0, "cp bucket %llu to %llu, target is %d\n",
3379              s_blkno, t_blkno, t_is_new);
3380
3381         s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3382                         GFP_NOFS);
3383         if (!s_bhs)
3384                 return -ENOMEM;
3385
3386         ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
3387         if (ret)
3388                 goto out;
3389
3390         t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3391                         GFP_NOFS);
3392         if (!t_bhs) {
3393                 ret = -ENOMEM;
3394                 goto out;
3395         }
3396
3397         ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
3398         if (ret)
3399                 goto out;
3400
3401         for (i = 0; i < blk_per_bucket; i++) {
3402                 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3403                                            OCFS2_JOURNAL_ACCESS_WRITE);
3404                 if (ret)
3405                         goto out;
3406         }
3407
3408         for (i = 0; i < blk_per_bucket; i++) {
3409                 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3410                 ocfs2_journal_dirty(handle, t_bhs[i]);
3411         }
3412
3413 out:
3414         if (s_bhs) {
3415                 for (i = 0; i < blk_per_bucket; i++)
3416                         brelse(s_bhs[i]);
3417         }
3418         kfree(s_bhs);
3419
3420         if (t_bhs) {
3421                 for (i = 0; i < blk_per_bucket; i++)
3422                         brelse(t_bhs[i]);
3423         }
3424         kfree(t_bhs);
3425
3426         return ret;
3427 }
3428
3429 /*
3430  * Copy one xattr cluster from src_blk to to_blk.
3431  * The to_blk will become the first bucket header of the cluster, so its
3432  * xh_num_buckets will be initialized as the bucket num in the cluster.
3433  */
3434 static int ocfs2_cp_xattr_cluster(struct inode *inode,
3435                                   handle_t *handle,
3436                                   struct buffer_head *first_bh,
3437                                   u64 src_blk,
3438                                   u64 to_blk,
3439                                   u32 *first_hash)
3440 {
3441         int i, ret, credits;
3442         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3443         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3444         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3445         struct buffer_head *bh = NULL;
3446         struct ocfs2_xattr_header *xh;
3447         u64 to_blk_start = to_blk;
3448
3449         mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
3450
3451         /*
3452          * We need to update the new cluster and 1 more for the update of
3453          * the 1st bucket of the previous extent rec.
3454          */
3455         credits = bpc + 1;
3456         ret = ocfs2_extend_trans(handle, credits);
3457         if (ret) {
3458                 mlog_errno(ret);
3459                 goto out;
3460         }
3461
3462         ret = ocfs2_journal_access(handle, inode, first_bh,
3463                                    OCFS2_JOURNAL_ACCESS_WRITE);
3464         if (ret) {
3465                 mlog_errno(ret);
3466                 goto out;
3467         }
3468
3469         for (i = 0; i < num_buckets; i++) {
3470                 ret = ocfs2_cp_xattr_bucket(inode, handle,
3471                                             src_blk, to_blk, 1);
3472                 if (ret) {
3473                         mlog_errno(ret);
3474                         goto out;
3475                 }
3476
3477                 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3478                 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3479         }
3480
3481         /* update the old bucket header. */
3482         xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3483         le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
3484
3485         ocfs2_journal_dirty(handle, first_bh);
3486
3487         /* update the new bucket header. */
3488         ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode);
3489         if (ret < 0) {
3490                 mlog_errno(ret);
3491                 goto out;
3492         }
3493
3494         ret = ocfs2_journal_access(handle, inode, bh,
3495                                    OCFS2_JOURNAL_ACCESS_WRITE);
3496         if (ret) {
3497                 mlog_errno(ret);
3498                 goto out;
3499         }
3500
3501         xh = (struct ocfs2_xattr_header *)bh->b_data;
3502         xh->xh_num_buckets = cpu_to_le16(num_buckets);
3503
3504         ocfs2_journal_dirty(handle, bh);
3505
3506         if (first_hash)
3507                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3508 out:
3509         brelse(bh);
3510         return ret;
3511 }
3512
3513 /*
3514  * Move half of the xattrs in this cluster to the new cluster.
3515  * This function should only be called when bucket size == cluster size.
3516  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
3517  */
3518 static int ocfs2_half_xattr_cluster(struct inode *inode,
3519                                     handle_t *handle,
3520                                     u64 prev_blk,
3521                                     u64 new_blk,
3522                                     u32 *first_hash)
3523 {
3524         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3525         int ret, credits = 2 * blk_per_bucket;
3526
3527         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
3528
3529         ret = ocfs2_extend_trans(handle, credits);
3530         if (ret) {
3531                 mlog_errno(ret);
3532                 return ret;
3533         }
3534
3535         /* Move half of the xattr in start_blk to the next bucket. */
3536         return  ocfs2_half_xattr_bucket(inode, handle, prev_blk,
3537                                         new_blk, first_hash, 1);
3538 }
3539
3540 /*
3541  * Move some xattrs from the old cluster to the new one since they are not
3542  * contiguous in ocfs2 xattr tree.
3543  *
3544  * new_blk starts a new separate cluster, and we will move some xattrs from
3545  * prev_blk to it. v_start will be set as the first name hash value in this
3546  * new cluster so that it can be used as e_cpos during tree insertion and
3547  * don't collide with our original b-tree operations. first_bh and header_bh
3548  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
3549  * to extend the insert bucket.
3550  *
3551  * The problem is how much xattr should we move to the new one and when should
3552  * we update first_bh and header_bh?
3553  * 1. If cluster size > bucket size, that means the previous cluster has more
3554  *    than 1 bucket, so just move half nums of bucket into the new cluster and
3555  *    update the first_bh and header_bh if the insert bucket has been moved
3556  *    to the new cluster.
3557  * 2. If cluster_size == bucket_size:
3558  *    a) If the previous extent rec has more than one cluster and the insert
3559  *       place isn't in the last cluster, copy the entire last cluster to the
3560  *       new one. This time, we don't need to upate the first_bh and header_bh
3561  *       since they will not be moved into the new cluster.
3562  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
3563  *       the new one. And we set the extend flag to zero if the insert place is
3564  *       moved into the new allocated cluster since no extend is needed.
3565  */
3566 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
3567                                             handle_t *handle,
3568                                             struct buffer_head **first_bh,
3569                                             struct buffer_head **header_bh,
3570                                             u64 new_blk,
3571                                             u64 prev_blk,
3572                                             u32 prev_clusters,
3573                                             u32 *v_start,
3574                                             int *extend)
3575 {
3576         int ret = 0;
3577         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3578
3579         mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
3580              prev_blk, prev_clusters, new_blk);
3581
3582         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
3583                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
3584                                                           handle,
3585                                                           first_bh,
3586                                                           header_bh,
3587                                                           new_blk,
3588                                                           prev_blk,
3589                                                           prev_clusters,
3590                                                           v_start);
3591         else {
3592                 u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
3593
3594                 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
3595                         ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
3596                                                      last_blk, new_blk,
3597                                                      v_start);
3598                 else {
3599                         ret = ocfs2_half_xattr_cluster(inode, handle,
3600                                                        last_blk, new_blk,
3601                                                        v_start);
3602
3603                         if ((*header_bh)->b_blocknr == last_blk && extend)
3604                                 *extend = 0;
3605                 }
3606         }
3607
3608         return ret;
3609 }
3610
3611 /*
3612  * Add a new cluster for xattr storage.
3613  *
3614  * If the new cluster is contiguous with the previous one, it will be
3615  * appended to the same extent record, and num_clusters will be updated.
3616  * If not, we will insert a new extent for it and move some xattrs in
3617  * the last cluster into the new allocated one.
3618  * We also need to limit the maximum size of a btree leaf, otherwise we'll
3619  * lose the benefits of hashing because we'll have to search large leaves.
3620  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
3621  * if it's bigger).
3622  *
3623  * first_bh is the first block of the previous extent rec and header_bh
3624  * indicates the bucket we will insert the new xattrs. They will be updated
3625  * when the header_bh is moved into the new cluster.
3626  */
3627 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
3628                                        struct buffer_head *root_bh,
3629                                        struct buffer_head **first_bh,
3630                                        struct buffer_head **header_bh,
3631                                        u32 *num_clusters,
3632                                        u32 prev_cpos,
3633                                        u64 prev_blkno,
3634                                        int *extend)
3635 {
3636         int ret, credits;
3637         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3638         u32 prev_clusters = *num_clusters;
3639         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
3640         u64 block;
3641         handle_t *handle = NULL;
3642         struct ocfs2_alloc_context *data_ac = NULL;
3643         struct ocfs2_alloc_context *meta_ac = NULL;
3644         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3645         struct ocfs2_extent_tree et;
3646
3647         mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
3648              "previous xattr blkno = %llu\n",
3649              (unsigned long long)OCFS2_I(inode)->ip_blkno,
3650              prev_cpos, prev_blkno);
3651
3652         ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
3653
3654         ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
3655                                     &data_ac, &meta_ac);
3656         if (ret) {
3657                 mlog_errno(ret);
3658                 goto leave;
3659         }
3660
3661         credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
3662                                             clusters_to_add);
3663         handle = ocfs2_start_trans(osb, credits);
3664         if (IS_ERR(handle)) {
3665                 ret = PTR_ERR(handle);
3666                 handle = NULL;
3667                 mlog_errno(ret);
3668                 goto leave;
3669         }
3670
3671         ret = ocfs2_journal_access(handle, inode, root_bh,
3672                                    OCFS2_JOURNAL_ACCESS_WRITE);
3673         if (ret < 0) {
3674                 mlog_errno(ret);
3675                 goto leave;
3676         }
3677
3678         ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
3679                                      clusters_to_add, &bit_off, &num_bits);
3680         if (ret < 0) {
3681                 if (ret != -ENOSPC)
3682                         mlog_errno(ret);
3683                 goto leave;
3684         }
3685
3686         BUG_ON(num_bits > clusters_to_add);
3687
3688         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
3689         mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
3690              num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
3691
3692         if (prev_blkno + prev_clusters * bpc == block &&
3693             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
3694              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
3695                 /*
3696                  * If this cluster is contiguous with the old one and
3697                  * adding this new cluster, we don't surpass the limit of
3698                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
3699                  * initialized and used like other buckets in the previous
3700                  * cluster.
3701                  * So add it as a contiguous one. The caller will handle
3702                  * its init process.
3703                  */
3704                 v_start = prev_cpos + prev_clusters;
3705                 *num_clusters = prev_clusters + num_bits;
3706                 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
3707                      num_bits);
3708         } else {
3709                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
3710                                                        handle,
3711                                                        first_bh,
3712                                                        header_bh,
3713                                                        block,
3714                                                        prev_blkno,
3715                                                        prev_clusters,
3716                                                        &v_start,
3717                                                        extend);
3718                 if (ret) {
3719                         mlog_errno(ret);
3720                         goto leave;
3721                 }
3722         }
3723
3724         if (handle->h_buffer_credits < credits) {
3725                 /*
3726                  * The journal has been restarted before, and don't
3727                  * have enough space for the insertion, so extend it
3728                  * here.
3729                  */
3730                 ret = ocfs2_extend_trans(handle, credits);
3731                 if (ret) {
3732                         mlog_errno(ret);
3733                         goto leave;
3734                 }
3735         }
3736         mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
3737              num_bits, block, v_start);
3738         ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
3739                                   num_bits, 0, meta_ac);
3740         if (ret < 0) {
3741                 mlog_errno(ret);
3742                 goto leave;
3743         }
3744
3745         ret = ocfs2_journal_dirty(handle, root_bh);
3746         if (ret < 0) {
3747                 mlog_errno(ret);
3748                 goto leave;
3749         }
3750
3751 leave:
3752         if (handle)
3753                 ocfs2_commit_trans(osb, handle);
3754         if (data_ac)
3755                 ocfs2_free_alloc_context(data_ac);
3756         if (meta_ac)
3757                 ocfs2_free_alloc_context(meta_ac);
3758
3759         return ret;
3760 }
3761
3762 /*
3763  * Extend a new xattr bucket and move xattrs to the end one by one until
3764  * We meet with start_bh. Only move half of the xattrs to the bucket after it.
3765  */
3766 static int ocfs2_extend_xattr_bucket(struct inode *inode,
3767                                      struct buffer_head *first_bh,
3768                                      struct buffer_head *start_bh,
3769                                      u32 num_clusters)
3770 {
3771         int ret, credits;
3772         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3773         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3774         u64 start_blk = start_bh->b_blocknr, end_blk;
3775         u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
3776         handle_t *handle;
3777         struct ocfs2_xattr_header *first_xh =
3778                                 (struct ocfs2_xattr_header *)first_bh->b_data;
3779         u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
3780
3781         mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
3782              "from %llu, len = %u\n", start_blk,
3783              (unsigned long long)first_bh->b_blocknr, num_clusters);
3784
3785         BUG_ON(bucket >= num_buckets);
3786
3787         end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
3788
3789         /*
3790          * We will touch all the buckets after the start_bh(include it).
3791          * Add one more bucket and modify the first_bh.
3792          */
3793         credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
3794         handle = ocfs2_start_trans(osb, credits);
3795         if (IS_ERR(handle)) {
3796                 ret = PTR_ERR(handle);
3797                 handle = NULL;
3798                 mlog_errno(ret);
3799                 goto out;
3800         }
3801
3802         ret = ocfs2_journal_access(handle, inode, first_bh,
3803                                    OCFS2_JOURNAL_ACCESS_WRITE);
3804         if (ret) {
3805                 mlog_errno(ret);
3806                 goto commit;
3807         }
3808
3809         while (end_blk != start_blk) {
3810                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
3811                                             end_blk + blk_per_bucket, 0);
3812                 if (ret)
3813                         goto commit;
3814                 end_blk -= blk_per_bucket;
3815         }
3816
3817         /* Move half of the xattr in start_blk to the next bucket. */
3818         ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
3819                                       start_blk + blk_per_bucket, NULL, 0);
3820
3821         le16_add_cpu(&first_xh->xh_num_buckets, 1);
3822         ocfs2_journal_dirty(handle, first_bh);
3823
3824 commit:
3825         ocfs2_commit_trans(osb, handle);
3826 out:
3827         return ret;
3828 }
3829
3830 /*
3831  * Add new xattr bucket in an extent record and adjust the buckets accordingly.
3832  * xb_bh is the ocfs2_xattr_block.
3833  * We will move all the buckets starting from header_bh to the next place. As
3834  * for this one, half num of its xattrs will be moved to the next one.
3835  *
3836  * We will allocate a new cluster if current cluster is full and adjust
3837  * header_bh and first_bh if the insert place is moved to the new cluster.
3838  */
3839 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
3840                                       struct buffer_head *xb_bh,
3841                                       struct buffer_head *header_bh)
3842 {
3843         struct ocfs2_xattr_header *first_xh = NULL;
3844         struct buffer_head *first_bh = NULL;
3845         struct ocfs2_xattr_block *xb =
3846                         (struct ocfs2_xattr_block *)xb_bh->b_data;
3847         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3848         struct ocfs2_extent_list *el = &xb_root->xt_list;
3849         struct ocfs2_xattr_header *xh =
3850                         (struct ocfs2_xattr_header *)header_bh->b_data;
3851         u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3852         struct super_block *sb = inode->i_sb;
3853         struct ocfs2_super *osb = OCFS2_SB(sb);
3854         int ret, num_buckets, extend = 1;
3855         u64 p_blkno;
3856         u32 e_cpos, num_clusters;
3857
3858         mlog(0, "Add new xattr bucket starting form %llu\n",
3859              (unsigned long long)header_bh->b_blocknr);
3860
3861         /*
3862          * Add refrence for header_bh here because it may be
3863          * changed in ocfs2_add_new_xattr_cluster and we need
3864          * to free it in the end.
3865          */
3866         get_bh(header_bh);
3867
3868         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
3869                                   &num_clusters, el);
3870         if (ret) {
3871                 mlog_errno(ret);
3872                 goto out;
3873         }
3874
3875         ret = ocfs2_read_block(osb, p_blkno,
3876                                &first_bh, OCFS2_BH_CACHED, inode);
3877         if (ret) {
3878                 mlog_errno(ret);
3879                 goto out;
3880         }
3881
3882         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
3883         first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3884
3885         if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
3886                 ret = ocfs2_add_new_xattr_cluster(inode,
3887                                                   xb_bh,
3888                                                   &first_bh,
3889                                                   &header_bh,
3890                                                   &num_clusters,
3891                                                   e_cpos,
3892                                                   p_blkno,
3893                                                   &extend);
3894                 if (ret) {
3895                         mlog_errno(ret);
3896                         goto out;
3897                 }
3898         }
3899
3900         if (extend)
3901                 ret = ocfs2_extend_xattr_bucket(inode,
3902                                                 first_bh,
3903                                                 header_bh,
3904                                                 num_clusters);
3905         if (ret)
3906                 mlog_errno(ret);
3907 out:
3908         brelse(first_bh);
3909         brelse(header_bh);
3910         return ret;
3911 }
3912
3913 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
3914                                         struct ocfs2_xattr_bucket *bucket,
3915                                         int offs)
3916 {
3917         int block_off = offs >> inode->i_sb->s_blocksize_bits;
3918
3919         offs = offs % inode->i_sb->s_blocksize;
3920         return bucket->bhs[block_off]->b_data + offs;
3921 }
3922
3923 /*
3924  * Handle the normal xattr set, including replace, delete and new.
3925  *
3926  * Note: "local" indicates the real data's locality. So we can't
3927  * just its bucket locality by its length.
3928  */
3929 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
3930                                          struct ocfs2_xattr_info *xi,
3931                                          struct ocfs2_xattr_search *xs,
3932                                          u32 name_hash,
3933                                          int local)
3934 {
3935         struct ocfs2_xattr_entry *last, *xe;
3936         int name_len = strlen(xi->name);
3937         struct ocfs2_xattr_header *xh = xs->header;
3938         u16 count = le16_to_cpu(xh->xh_count), start;
3939         size_t blocksize = inode->i_sb->s_blocksize;
3940         char *val;
3941         size_t offs, size, new_size;
3942
3943         last = &xh->xh_entries[count];
3944         if (!xs->not_found) {
3945                 xe = xs->here;
3946                 offs = le16_to_cpu(xe->xe_name_offset);
3947                 if (ocfs2_xattr_is_local(xe))
3948                         size = OCFS2_XATTR_SIZE(name_len) +
3949                         OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3950                 else
3951                         size = OCFS2_XATTR_SIZE(name_len) +
3952                         OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
3953
3954                 /*
3955                  * If the new value will be stored outside, xi->value has been
3956                  * initalized as an empty ocfs2_xattr_value_root, and the same
3957                  * goes with xi->value_len, so we can set new_size safely here.
3958                  * See ocfs2_xattr_set_in_bucket.
3959                  */
3960                 new_size = OCFS2_XATTR_SIZE(name_len) +
3961                            OCFS2_XATTR_SIZE(xi->value_len);
3962
3963                 le16_add_cpu(&xh->xh_name_value_len, -size);
3964                 if (xi->value) {
3965                         if (new_size > size)
3966                                 goto set_new_name_value;
3967
3968                         /* Now replace the old value with new one. */
3969                         if (local)
3970                                 xe->xe_value_size = cpu_to_le64(xi->value_len);
3971                         else
3972                                 xe->xe_value_size = 0;
3973
3974                         val = ocfs2_xattr_bucket_get_val(inode,
3975                                                          &xs->bucket, offs);
3976                         memset(val + OCFS2_XATTR_SIZE(name_len), 0,
3977                                size - OCFS2_XATTR_SIZE(name_len));
3978                         if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
3979                                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
3980                                        xi->value, xi->value_len);
3981
3982                         le16_add_cpu(&xh->xh_name_value_len, new_size);
3983                         ocfs2_xattr_set_local(xe, local);
3984                         return;
3985                 } else {
3986                         /*
3987                          * Remove the old entry if there is more than one.
3988                          * We don't remove the last entry so that we can
3989                          * use it to indicate the hash value of the empty
3990                          * bucket.
3991                          */
3992                         last -= 1;
3993                         le16_add_cpu(&xh->xh_count, -1);
3994                         if (xh->xh_count) {
3995                                 memmove(xe, xe + 1,
3996                                         (void *)last - (void *)xe);
3997                                 memset(last, 0,
3998                                        sizeof(struct ocfs2_xattr_entry));
3999                         } else
4000                                 xh->xh_free_start =
4001                                         cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4002
4003                         return;
4004                 }
4005         } else {
4006                 /* find a new entry for insert. */
4007                 int low = 0, high = count - 1, tmp;
4008                 struct ocfs2_xattr_entry *tmp_xe;
4009
4010                 while (low <= high && count) {
4011                         tmp = (low + high) / 2;
4012                         tmp_xe = &xh->xh_entries[tmp];
4013
4014                         if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
4015                                 low = tmp + 1;
4016                         else if (name_hash <
4017                                  le32_to_cpu(tmp_xe->xe_name_hash))
4018                                 high = tmp - 1;
4019                         else {
4020                                 low = tmp;
4021                                 break;
4022                         }
4023                 }
4024
4025                 xe = &xh->xh_entries[low];
4026                 if (low != count)
4027                         memmove(xe + 1, xe, (void *)last - (void *)xe);
4028
4029                 le16_add_cpu(&xh->xh_count, 1);
4030                 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4031                 xe->xe_name_hash = cpu_to_le32(name_hash);
4032                 xe->xe_name_len = name_len;
4033                 ocfs2_xattr_set_type(xe, xi->name_index);
4034         }
4035
4036 set_new_name_value:
4037         /* Insert the new name+value. */
4038         size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4039
4040         /*
4041          * We must make sure that the name/value pair
4042          * exists in the same block.
4043          */
4044         offs = le16_to_cpu(xh->xh_free_start);
4045         start = offs - size;
4046
4047         if (start >> inode->i_sb->s_blocksize_bits !=
4048             (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4049                 offs = offs - offs % blocksize;
4050                 xh->xh_free_start = cpu_to_le16(offs);
4051         }
4052
4053         val = ocfs2_xattr_bucket_get_val(inode,
4054                                          &xs->bucket, offs - size);
4055         xe->xe_name_offset = cpu_to_le16(offs - size);
4056
4057         memset(val, 0, size);
4058         memcpy(val, xi->name, name_len);
4059         memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4060
4061         xe->xe_value_size = cpu_to_le64(xi->value_len);
4062         ocfs2_xattr_set_local(xe, local);
4063         xs->here = xe;
4064         le16_add_cpu(&xh->xh_free_start, -size);
4065         le16_add_cpu(&xh->xh_name_value_len, size);
4066
4067         return;
4068 }
4069
4070 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
4071                                              handle_t *handle,
4072                                              struct ocfs2_xattr_search *xs,
4073                                              struct buffer_head **bhs,
4074                                              u16 bh_num)
4075 {
4076         int ret = 0, off, block_off;
4077         struct ocfs2_xattr_entry *xe = xs->here;
4078
4079         /*
4080          * First calculate all the blocks we should journal_access
4081          * and journal_dirty. The first block should always be touched.
4082          */
4083         ret = ocfs2_journal_dirty(handle, bhs[0]);
4084         if (ret)
4085                 mlog_errno(ret);
4086
4087         /* calc the data. */
4088         off = le16_to_cpu(xe->xe_name_offset);
4089         block_off = off >> inode->i_sb->s_blocksize_bits;
4090         ret = ocfs2_journal_dirty(handle, bhs[block_off]);
4091         if (ret)
4092                 mlog_errno(ret);
4093
4094         return ret;
4095 }
4096
4097 /*
4098  * Set the xattr entry in the specified bucket.
4099  * The bucket is indicated by xs->bucket and it should have the enough
4100  * space for the xattr insertion.
4101  */
4102 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4103                                            struct ocfs2_xattr_info *xi,
4104                                            struct ocfs2_xattr_search *xs,
4105                                            u32 name_hash,
4106                                            int local)
4107 {
4108         int i, ret;
4109         handle_t *handle = NULL;
4110         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4111         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4112
4113         mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4114              (unsigned long)xi->value_len, xi->name_index,
4115              (unsigned long long)xs->bucket.bhs[0]->b_blocknr);
4116
4117         if (!xs->bucket.bhs[1]) {
4118                 ret = ocfs2_read_blocks(osb,
4119                                         xs->bucket.bhs[0]->b_blocknr + 1,
4120                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
4121                                         OCFS2_BH_CACHED, inode);
4122                 if (ret) {
4123                         mlog_errno(ret);
4124                         goto out;
4125                 }
4126         }
4127
4128         handle = ocfs2_start_trans(osb, blk_per_bucket);
4129         if (IS_ERR(handle)) {
4130                 ret = PTR_ERR(handle);
4131                 handle = NULL;
4132                 mlog_errno(ret);
4133                 goto out;
4134         }
4135
4136         for (i = 0; i < blk_per_bucket; i++) {
4137                 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
4138                                            OCFS2_JOURNAL_ACCESS_WRITE);
4139                 if (ret < 0) {
4140                         mlog_errno(ret);
4141                         goto out;
4142                 }
4143         }
4144
4145         ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4146
4147         /*Only dirty the blocks we have touched in set xattr. */
4148         ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
4149                                                 xs->bucket.bhs, blk_per_bucket);
4150         if (ret)
4151                 mlog_errno(ret);
4152 out:
4153         ocfs2_commit_trans(osb, handle);
4154
4155         return ret;
4156 }
4157
4158 static int ocfs2_xattr_value_update_size(struct inode *inode,
4159                                          struct buffer_head *xe_bh,
4160                                          struct ocfs2_xattr_entry *xe,
4161                                          u64 new_size)
4162 {
4163         int ret;
4164         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4165         handle_t *handle = NULL;
4166
4167         handle = ocfs2_start_trans(osb, 1);
4168         if (handle == NULL) {
4169                 ret = -ENOMEM;
4170                 mlog_errno(ret);
4171                 goto out;
4172         }
4173
4174         ret = ocfs2_journal_access(handle, inode, xe_bh,
4175                                    OCFS2_JOURNAL_ACCESS_WRITE);
4176         if (ret < 0) {
4177                 mlog_errno(ret);
4178                 goto out_commit;
4179         }
4180
4181         xe->xe_value_size = cpu_to_le64(new_size);
4182
4183         ret = ocfs2_journal_dirty(handle, xe_bh);
4184         if (ret < 0)
4185                 mlog_errno(ret);
4186
4187 out_commit:
4188         ocfs2_commit_trans(osb, handle);
4189 out:
4190         return ret;
4191 }
4192
4193 /*
4194  * Truncate the specified xe_off entry in xattr bucket.
4195  * bucket is indicated by header_bh and len is the new length.
4196  * Both the ocfs2_xattr_value_root and the entry will be updated here.
4197  *
4198  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4199  */
4200 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4201                                              struct buffer_head *header_bh,
4202                                              int xe_off,
4203                                              int len)
4204 {
4205         int ret, offset;
4206         u64 value_blk;
4207         struct buffer_head *value_bh = NULL;
4208         struct ocfs2_xattr_value_root *xv;
4209         struct ocfs2_xattr_entry *xe;
4210         struct ocfs2_xattr_header *xh =
4211                         (struct ocfs2_xattr_header *)header_bh->b_data;
4212         size_t blocksize = inode->i_sb->s_blocksize;
4213
4214         xe = &xh->xh_entries[xe_off];
4215
4216         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4217
4218         offset = le16_to_cpu(xe->xe_name_offset) +
4219                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4220
4221         value_blk = offset / blocksize;
4222
4223         /* We don't allow ocfs2_xattr_value to be stored in different block. */
4224         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4225         value_blk += header_bh->b_blocknr;
4226
4227         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk,
4228                                &value_bh, OCFS2_BH_CACHED, inode);
4229         if (ret) {
4230                 mlog_errno(ret);
4231                 goto out;
4232         }
4233
4234         xv = (struct ocfs2_xattr_value_root *)
4235                 (value_bh->b_data + offset % blocksize);
4236
4237         mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4238              xe_off, (unsigned long long)header_bh->b_blocknr, len);
4239         ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
4240         if (ret) {
4241                 mlog_errno(ret);
4242                 goto out;
4243         }
4244
4245         ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
4246         if (ret) {
4247                 mlog_errno(ret);
4248                 goto out;
4249         }
4250
4251 out:
4252         brelse(value_bh);
4253         return ret;
4254 }
4255
4256 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4257                                                 struct ocfs2_xattr_search *xs,
4258                                                 int len)
4259 {
4260         int ret, offset;
4261         struct ocfs2_xattr_entry *xe = xs->here;
4262         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4263
4264         BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4265
4266         offset = xe - xh->xh_entries;
4267         ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
4268                                                 offset, len);
4269         if (ret)
4270                 mlog_errno(ret);
4271
4272         return ret;
4273 }
4274
4275 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4276                                                 struct ocfs2_xattr_search *xs,
4277                                                 char *val,
4278                                                 int value_len)
4279 {
4280         int offset;
4281         struct ocfs2_xattr_value_root *xv;
4282         struct ocfs2_xattr_entry *xe = xs->here;
4283
4284         BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4285
4286         offset = le16_to_cpu(xe->xe_name_offset) +
4287                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4288
4289         xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
4290
4291         return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
4292 }
4293
4294 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4295                                   struct buffer_head *root_bh,
4296                                   u64 blkno,
4297                                   u32 cpos,
4298                                   u32 len)
4299 {
4300         int ret;
4301         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4302         struct inode *tl_inode = osb->osb_tl_inode;
4303         handle_t *handle;
4304         struct ocfs2_xattr_block *xb =
4305                         (struct ocfs2_xattr_block *)root_bh->b_data;
4306         struct ocfs2_alloc_context *meta_ac = NULL;
4307         struct ocfs2_cached_dealloc_ctxt dealloc;
4308         struct ocfs2_extent_tree et;
4309
4310         ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
4311
4312         ocfs2_init_dealloc_ctxt(&dealloc);
4313
4314         mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4315              cpos, len, (unsigned long long)blkno);
4316
4317         ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4318
4319         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4320         if (ret) {
4321                 mlog_errno(ret);
4322                 return ret;
4323         }
4324
4325         mutex_lock(&tl_inode->i_mutex);
4326
4327         if (ocfs2_truncate_log_needs_flush(osb)) {
4328                 ret = __ocfs2_flush_truncate_log(osb);
4329                 if (ret < 0) {
4330                         mlog_errno(ret);
4331                         goto out;
4332                 }
4333         }
4334
4335         handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
4336         if (handle == NULL) {
4337                 ret = -ENOMEM;
4338                 mlog_errno(ret);
4339                 goto out;
4340         }
4341
4342         ret = ocfs2_journal_access(handle, inode, root_bh,
4343                                    OCFS2_JOURNAL_ACCESS_WRITE);
4344         if (ret) {
4345                 mlog_errno(ret);
4346                 goto out_commit;
4347         }
4348
4349         ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
4350                                   &dealloc);
4351         if (ret) {
4352                 mlog_errno(ret);
4353                 goto out_commit;
4354         }
4355
4356         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4357
4358         ret = ocfs2_journal_dirty(handle, root_bh);
4359         if (ret) {
4360                 mlog_errno(ret);
4361                 goto out_commit;
4362         }
4363
4364         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4365         if (ret)
4366                 mlog_errno(ret);
4367
4368 out_commit:
4369         ocfs2_commit_trans(osb, handle);
4370 out:
4371         ocfs2_schedule_truncate_log_flush(osb, 1);
4372
4373         mutex_unlock(&tl_inode->i_mutex);
4374
4375         if (meta_ac)
4376                 ocfs2_free_alloc_context(meta_ac);
4377
4378         ocfs2_run_deallocs(osb, &dealloc);
4379
4380         return ret;
4381 }
4382
4383 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4384                                          struct ocfs2_xattr_search *xs)
4385 {
4386         handle_t *handle = NULL;
4387         struct ocfs2_xattr_header *xh = xs->bucket.xh;
4388         struct ocfs2_xattr_entry *last = &xh->xh_entries[
4389                                                 le16_to_cpu(xh->xh_count) - 1];
4390         int ret = 0;
4391
4392         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
4393         if (IS_ERR(handle)) {
4394                 ret = PTR_ERR(handle);
4395                 mlog_errno(ret);
4396                 return;
4397         }
4398
4399         ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
4400                                    OCFS2_JOURNAL_ACCESS_WRITE);
4401         if (ret) {
4402                 mlog_errno(ret);
4403                 goto out_commit;
4404         }
4405
4406         /* Remove the old entry. */
4407         memmove(xs->here, xs->here + 1,
4408                 (void *)last - (void *)xs->here);
4409         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4410         le16_add_cpu(&xh->xh_count, -1);
4411
4412         ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
4413         if (ret < 0)
4414                 mlog_errno(ret);
4415 out_commit:
4416         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
4417 }
4418
4419 /*
4420  * Set the xattr name/value in the bucket specified in xs.
4421  *
4422  * As the new value in xi may be stored in the bucket or in an outside cluster,
4423  * we divide the whole process into 3 steps:
4424  * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4425  * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4426  * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4427  * 4. If the clusters for the new outside value can't be allocated, we need
4428  *    to free the xattr we allocated in set.
4429  */
4430 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4431                                      struct ocfs2_xattr_info *xi,
4432                                      struct ocfs2_xattr_search *xs)
4433 {
4434         int ret, local = 1;
4435         size_t value_len;
4436         char *val = (char *)xi->value;
4437         struct ocfs2_xattr_entry *xe = xs->here;
4438         u32 name_hash = ocfs2_xattr_hash_by_name(inode,
4439                                                  xi->name_index, xi->name);
4440
4441         if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4442                 /*
4443                  * We need to truncate the xattr storage first.
4444                  *
4445                  * If both the old and new value are stored to
4446                  * outside block, we only need to truncate
4447                  * the storage and then set the value outside.
4448                  *
4449                  * If the new value should be stored within block,
4450                  * we should free all the outside block first and
4451                  * the modification to the xattr block will be done
4452                  * by following steps.
4453                  */
4454                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4455                         value_len = xi->value_len;
4456                 else
4457                         value_len = 0;
4458
4459                 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4460                                                            value_len);
4461                 if (ret)
4462                         goto out;
4463
4464                 if (value_len)
4465                         goto set_value_outside;
4466         }
4467
4468         value_len = xi->value_len;
4469         /* So we have to handle the inside block change now. */
4470         if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4471                 /*
4472                  * If the new value will be stored outside of block,
4473                  * initalize a new empty value root and insert it first.
4474                  */
4475                 local = 0;
4476                 xi->value = &def_xv;
4477                 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4478         }
4479
4480         ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local);
4481         if (ret) {
4482                 mlog_errno(ret);
4483                 goto out;
4484         }
4485
4486         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
4487                 goto out;
4488
4489         /* allocate the space now for the outside block storage. */
4490         ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4491                                                    value_len);
4492         if (ret) {
4493                 mlog_errno(ret);
4494
4495                 if (xs->not_found) {
4496                         /*
4497                          * We can't allocate enough clusters for outside
4498                          * storage and we have allocated xattr already,
4499                          * so need to remove it.
4500                          */
4501                         ocfs2_xattr_bucket_remove_xs(inode, xs);
4502                 }
4503                 goto out;
4504         }
4505
4506 set_value_outside:
4507         ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
4508 out:
4509         return ret;
4510 }
4511
4512 /* check whether the xattr bucket is filled up with the same hash value. */
4513 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
4514                                               struct ocfs2_xattr_bucket *bucket)
4515 {
4516         struct ocfs2_xattr_header *xh = bucket->xh;
4517
4518         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
4519             xh->xh_entries[0].xe_name_hash) {
4520                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
4521                      "hash = %u\n",
4522                      (unsigned long long)bucket->bhs[0]->b_blocknr,
4523                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
4524                 return -ENOSPC;
4525         }
4526
4527         return 0;
4528 }
4529
4530 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
4531                                              struct ocfs2_xattr_info *xi,
4532                                              struct ocfs2_xattr_search *xs)
4533 {
4534         struct ocfs2_xattr_header *xh;
4535         struct ocfs2_xattr_entry *xe;
4536         u16 count, header_size, xh_free_start;
4537         int i, free, max_free, need, old;
4538         size_t value_size = 0, name_len = strlen(xi->name);
4539         size_t blocksize = inode->i_sb->s_blocksize;
4540         int ret, allocation = 0;
4541         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4542
4543         mlog_entry("Set xattr %s in xattr index block\n", xi->name);
4544
4545 try_again:
4546         xh = xs->header;
4547         count = le16_to_cpu(xh->xh_count);
4548         xh_free_start = le16_to_cpu(xh->xh_free_start);
4549         header_size = sizeof(struct ocfs2_xattr_header) +
4550                         count * sizeof(struct ocfs2_xattr_entry);
4551         max_free = OCFS2_XATTR_BUCKET_SIZE -
4552                 le16_to_cpu(xh->xh_name_value_len) - header_size;
4553
4554         mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
4555                         "of %u which exceed block size\n",
4556                         (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4557                         header_size);
4558
4559         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4560                 value_size = OCFS2_XATTR_ROOT_SIZE;
4561         else if (xi->value)
4562                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
4563
4564         if (xs->not_found)
4565                 need = sizeof(struct ocfs2_xattr_entry) +
4566                         OCFS2_XATTR_SIZE(name_len) + value_size;
4567         else {
4568                 need = value_size + OCFS2_XATTR_SIZE(name_len);
4569
4570                 /*
4571                  * We only replace the old value if the new length is smaller
4572                  * than the old one. Otherwise we will allocate new space in the
4573                  * bucket to store it.
4574                  */
4575                 xe = xs->here;
4576                 if (ocfs2_xattr_is_local(xe))
4577                         old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4578                 else
4579                         old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4580
4581                 if (old >= value_size)
4582                         need = 0;
4583         }
4584
4585         free = xh_free_start - header_size;
4586         /*
4587          * We need to make sure the new name/value pair
4588          * can exist in the same block.
4589          */
4590         if (xh_free_start % blocksize < need)
4591                 free -= xh_free_start % blocksize;
4592
4593         mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
4594              "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
4595              " %u\n", xs->not_found,
4596              (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4597              free, need, max_free, le16_to_cpu(xh->xh_free_start),
4598              le16_to_cpu(xh->xh_name_value_len));
4599
4600         if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4601                 if (need <= max_free &&
4602                     count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4603                         /*
4604                          * We can create the space by defragment. Since only the
4605                          * name/value will be moved, the xe shouldn't be changed
4606                          * in xs.
4607                          */
4608                         ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
4609                         if (ret) {
4610                                 mlog_errno(ret);
4611                                 goto out;
4612                         }
4613
4614                         xh_free_start = le16_to_cpu(xh->xh_free_start);
4615                         free = xh_free_start - header_size;
4616                         if (xh_free_start % blocksize < need)
4617                                 free -= xh_free_start % blocksize;
4618
4619                         if (free >= need)
4620                                 goto xattr_set;
4621
4622                         mlog(0, "Can't get enough space for xattr insert by "
4623                              "defragment. Need %u bytes, but we have %d, so "
4624                              "allocate new bucket for it.\n", need, free);
4625                 }
4626
4627                 /*
4628                  * We have to add new buckets or clusters and one
4629                  * allocation should leave us enough space for insert.
4630                  */
4631                 BUG_ON(allocation);
4632
4633                 /*
4634                  * We do not allow for overlapping ranges between buckets. And
4635                  * the maximum number of collisions we will allow for then is
4636                  * one bucket's worth, so check it here whether we need to
4637                  * add a new bucket for the insert.
4638                  */
4639                 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
4640                 if (ret) {
4641                         mlog_errno(ret);
4642                         goto out;
4643                 }
4644
4645                 ret = ocfs2_add_new_xattr_bucket(inode,
4646                                                  xs->xattr_bh,
4647                                                  xs->bucket.bhs[0]);
4648                 if (ret) {
4649                         mlog_errno(ret);
4650                         goto out;
4651                 }
4652
4653                 for (i = 0; i < blk_per_bucket; i++)
4654                         brelse(xs->bucket.bhs[i]);
4655
4656                 memset(&xs->bucket, 0, sizeof(xs->bucket));
4657
4658                 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
4659                                                    xi->name_index,
4660                                                    xi->name, xs);
4661                 if (ret && ret != -ENODATA)
4662                         goto out;
4663                 xs->not_found = ret;
4664                 allocation = 1;
4665                 goto try_again;
4666         }
4667
4668 xattr_set:
4669         ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
4670 out:
4671         mlog_exit(ret);
4672         return ret;
4673 }
4674
4675 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
4676                                         struct ocfs2_xattr_bucket *bucket,
4677                                         void *para)
4678 {
4679         int ret = 0;
4680         struct ocfs2_xattr_header *xh = bucket->xh;
4681         u16 i;
4682         struct ocfs2_xattr_entry *xe;
4683
4684         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4685                 xe = &xh->xh_entries[i];
4686                 if (ocfs2_xattr_is_local(xe))
4687                         continue;
4688
4689                 ret = ocfs2_xattr_bucket_value_truncate(inode,
4690                                                         bucket->bhs[0],
4691                                                         i, 0);
4692                 if (ret) {
4693                         mlog_errno(ret);
4694                         break;
4695                 }
4696         }
4697
4698         return ret;
4699 }
4700
4701 static int ocfs2_delete_xattr_index_block(struct inode *inode,
4702                                           struct buffer_head *xb_bh)
4703 {
4704         struct ocfs2_xattr_block *xb =
4705                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4706         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4707         int ret = 0;
4708         u32 name_hash = UINT_MAX, e_cpos, num_clusters;
4709         u64 p_blkno;
4710
4711         if (le16_to_cpu(el->l_next_free_rec) == 0)
4712                 return 0;
4713
4714         while (name_hash > 0) {
4715                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4716                                           &e_cpos, &num_clusters, el);
4717                 if (ret) {
4718                         mlog_errno(ret);
4719                         goto out;
4720                 }
4721
4722                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
4723                                                   ocfs2_delete_xattr_in_bucket,
4724                                                   NULL);
4725                 if (ret) {
4726                         mlog_errno(ret);
4727                         goto out;
4728                 }
4729
4730                 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
4731                                              p_blkno, e_cpos, num_clusters);
4732                 if (ret) {
4733                         mlog_errno(ret);
4734                         break;
4735                 }
4736
4737                 if (e_cpos == 0)
4738                         break;
4739
4740                 name_hash = e_cpos - 1;
4741         }
4742
4743 out:
4744         return ret;
4745 }
4746
4747 /*
4748  * 'trusted' attributes support
4749  */
4750
4751 #define XATTR_TRUSTED_PREFIX "trusted."
4752
4753 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
4754                                        size_t list_size, const char *name,
4755                                        size_t name_len)
4756 {
4757         const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX) - 1;
4758         const size_t total_len = prefix_len + name_len + 1;
4759
4760         if (list && total_len <= list_size) {
4761                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
4762                 memcpy(list + prefix_len, name, name_len);
4763                 list[prefix_len + name_len] = '\0';
4764         }
4765         return total_len;
4766 }
4767
4768 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
4769                                    void *buffer, size_t size)
4770 {
4771         if (strcmp(name, "") == 0)
4772                 return -EINVAL;
4773         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
4774                                buffer, size);
4775 }
4776
4777 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
4778                                    const void *value, size_t size, int flags)
4779 {
4780         if (strcmp(name, "") == 0)
4781                 return -EINVAL;
4782
4783         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
4784                                size, flags);
4785 }
4786
4787 struct xattr_handler ocfs2_xattr_trusted_handler = {
4788         .prefix = XATTR_TRUSTED_PREFIX,
4789         .list   = ocfs2_xattr_trusted_list,
4790         .get    = ocfs2_xattr_trusted_get,
4791         .set    = ocfs2_xattr_trusted_set,
4792 };
4793
4794
4795 /*
4796  * 'user' attributes support
4797  */
4798
4799 #define XATTR_USER_PREFIX "user."
4800
4801 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
4802                                     size_t list_size, const char *name,
4803                                     size_t name_len)
4804 {
4805         const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1;
4806         const size_t total_len = prefix_len + name_len + 1;
4807         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4808
4809         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4810                 return 0;
4811
4812         if (list && total_len <= list_size) {
4813                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
4814                 memcpy(list + prefix_len, name, name_len);
4815                 list[prefix_len + name_len] = '\0';
4816         }
4817         return total_len;
4818 }
4819
4820 static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
4821                                 void *buffer, size_t size)
4822 {
4823         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4824
4825         if (strcmp(name, "") == 0)
4826                 return -EINVAL;
4827         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4828                 return -EOPNOTSUPP;
4829         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
4830                                buffer, size);
4831 }
4832
4833 static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
4834                                 const void *value, size_t size, int flags)
4835 {
4836         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4837
4838         if (strcmp(name, "") == 0)
4839                 return -EINVAL;
4840         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4841                 return -EOPNOTSUPP;
4842
4843         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
4844                                size, flags);
4845 }
4846
4847 struct xattr_handler ocfs2_xattr_user_handler = {
4848         .prefix = XATTR_USER_PREFIX,
4849         .list   = ocfs2_xattr_user_list,
4850         .get    = ocfs2_xattr_user_get,
4851         .set    = ocfs2_xattr_user_set,
4852 };