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   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 const char *ocfs2_xattr_prefix(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 ? handler->prefix : NULL;
 148 }
 149
 150 static u32 ocfs2_xattr_name_hash(struct inode *inode,
 151                                  const char *name,
 152                                  int name_len)
 153 {
 154         /* Get hash value of uuid from super block */
 155         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
 156         int i;
 157
 158         /* hash extended attribute name */
 159         for (i = 0; i < name_len; i++) {
 160                 hash = (hash << OCFS2_HASH_SHIFT) ^
 161                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 162                        *name++;
 163         }
 164
 165         return hash;
 166 }
 167
 168 /*
 169  * ocfs2_xattr_hash_entry()
 170  *
 171  * Compute the hash of an extended attribute.
 172  */
 173 static void ocfs2_xattr_hash_entry(struct inode *inode,
 174                                    struct ocfs2_xattr_header *header,
 175                                    struct ocfs2_xattr_entry *entry)
 176 {
 177         u32 hash = 0;
 178         char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
 179
 180         hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
 181         entry->xe_name_hash = cpu_to_le32(hash);
 182
 183         return;
 184 }
 185
 186 static int ocfs2_xattr_extend_allocation(struct inode *inode,
 187                                          u32 clusters_to_add,
 188                                          struct buffer_head *xattr_bh,
 189                                          struct ocfs2_xattr_value_root *xv)
 190 {
 191         int status = 0;
 192         int restart_func = 0;
 193         int credits = 0;
 194         handle_t *handle = NULL;
 195         struct ocfs2_alloc_context *data_ac = NULL;
 196         struct ocfs2_alloc_context *meta_ac = NULL;
 197         enum ocfs2_alloc_restarted why;
 198         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 199         u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
 200         struct ocfs2_extent_tree et;
 201
 202         mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
 203
 204         ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
 205
 206 restart_all:
 207
 208         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 209                                        &data_ac, &meta_ac);
 210         if (status) {
 211                 mlog_errno(status);
 212                 goto leave;
 213         }
 214
 215         credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
 216                                             clusters_to_add);
 217         handle = ocfs2_start_trans(osb, credits);
 218         if (IS_ERR(handle)) {
 219                 status = PTR_ERR(handle);
 220                 handle = NULL;
 221                 mlog_errno(status);
 222                 goto leave;
 223         }
 224
 225 restarted_transaction:
 226         status = ocfs2_journal_access(handle, inode, xattr_bh,
 227                                       OCFS2_JOURNAL_ACCESS_WRITE);
 228         if (status < 0) {
 229                 mlog_errno(status);
 230                 goto leave;
 231         }
 232
 233         prev_clusters = le32_to_cpu(xv->xr_clusters);
 234         status = ocfs2_add_clusters_in_btree(osb,
 235                                              inode,
 236                                              &logical_start,
 237                                              clusters_to_add,
 238                                              0,
 239                                              &et,
 240                                              handle,
 241                                              data_ac,
 242                                              meta_ac,
 243                                              &why);
 244         if ((status < 0) && (status != -EAGAIN)) {
 245                 if (status != -ENOSPC)
 246                         mlog_errno(status);
 247                 goto leave;
 248         }
 249
 250         status = ocfs2_journal_dirty(handle, xattr_bh);
 251         if (status < 0) {
 252                 mlog_errno(status);
 253                 goto leave;
 254         }
 255
 256         clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
 257
 258         if (why != RESTART_NONE && clusters_to_add) {
 259                 if (why == RESTART_META) {
 260                         mlog(0, "restarting function.\n");
 261                         restart_func = 1;
 262                 } else {
 263                         BUG_ON(why != RESTART_TRANS);
 264
 265                         mlog(0, "restarting transaction.\n");
 266                         /* TODO: This can be more intelligent. */
 267                         credits = ocfs2_calc_extend_credits(osb->sb,
 268                                                             et.et_root_el,
 269                                                             clusters_to_add);
 270                         status = ocfs2_extend_trans(handle, credits);
 271                         if (status < 0) {
 272                                 /* handle still has to be committed at
 273                                  * this point. */
 274                                 status = -ENOMEM;
 275                                 mlog_errno(status);
 276                                 goto leave;
 277                         }
 278                         goto restarted_transaction;
 279                 }
 280         }
 281
 282 leave:
 283         if (handle) {
 284                 ocfs2_commit_trans(osb, handle);
 285                 handle = NULL;
 286         }
 287         if (data_ac) {
 288                 ocfs2_free_alloc_context(data_ac);
 289                 data_ac = NULL;
 290         }
 291         if (meta_ac) {
 292                 ocfs2_free_alloc_context(meta_ac);
 293                 meta_ac = NULL;
 294         }
 295         if ((!status) && restart_func) {
 296                 restart_func = 0;
 297                 goto restart_all;
 298         }
 299
 300         return status;
 301 }
 302
 303 static int __ocfs2_remove_xattr_range(struct inode *inode,
 304                                       struct buffer_head *root_bh,
 305                                       struct ocfs2_xattr_value_root *xv,
 306                                       u32 cpos, u32 phys_cpos, u32 len,
 307                                       struct ocfs2_cached_dealloc_ctxt *dealloc)
 308 {
 309         int ret;
 310         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 311         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 312         struct inode *tl_inode = osb->osb_tl_inode;
 313         handle_t *handle;
 314         struct ocfs2_alloc_context *meta_ac = NULL;
 315         struct ocfs2_extent_tree et;
 316
 317         ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
 318
 319         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
 320         if (ret) {
 321                 mlog_errno(ret);
 322                 return ret;
 323         }
 324
 325         mutex_lock(&tl_inode->i_mutex);
 326
 327         if (ocfs2_truncate_log_needs_flush(osb)) {
 328                 ret = __ocfs2_flush_truncate_log(osb);
 329                 if (ret < 0) {
 330                         mlog_errno(ret);
 331                         goto out;
 332                 }
 333         }
 334
 335         handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
 336         if (IS_ERR(handle)) {
 337                 ret = PTR_ERR(handle);
 338                 mlog_errno(ret);
 339                 goto out;
 340         }
 341
 342         ret = ocfs2_journal_access(handle, inode, root_bh,
 343                                    OCFS2_JOURNAL_ACCESS_WRITE);
 344         if (ret) {
 345                 mlog_errno(ret);
 346                 goto out_commit;
 347         }
 348
 349         ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
 350                                   dealloc);
 351         if (ret) {
 352                 mlog_errno(ret);
 353                 goto out_commit;
 354         }
 355
 356         le32_add_cpu(&xv->xr_clusters, -len);
 357
 358         ret = ocfs2_journal_dirty(handle, root_bh);
 359         if (ret) {
 360                 mlog_errno(ret);
 361                 goto out_commit;
 362         }
 363
 364         ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
 365         if (ret)
 366                 mlog_errno(ret);
 367
 368 out_commit:
 369         ocfs2_commit_trans(osb, handle);
 370 out:
 371         mutex_unlock(&tl_inode->i_mutex);
 372
 373         if (meta_ac)
 374                 ocfs2_free_alloc_context(meta_ac);
 375
 376         return ret;
 377 }
 378
 379 static int ocfs2_xattr_shrink_size(struct inode *inode,
 380                                    u32 old_clusters,
 381                                    u32 new_clusters,
 382                                    struct buffer_head *root_bh,
 383                                    struct ocfs2_xattr_value_root *xv)
 384 {
 385         int ret = 0;
 386         u32 trunc_len, cpos, phys_cpos, alloc_size;
 387         u64 block;
 388         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 389         struct ocfs2_cached_dealloc_ctxt dealloc;
 390
 391         ocfs2_init_dealloc_ctxt(&dealloc);
 392
 393         if (old_clusters <= new_clusters)
 394                 return 0;
 395
 396         cpos = new_clusters;
 397         trunc_len = old_clusters - new_clusters;
 398         while (trunc_len) {
 399                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
 400                                                &alloc_size, &xv->xr_list);
 401                 if (ret) {
 402                         mlog_errno(ret);
 403                         goto out;
 404                 }
 405
 406                 if (alloc_size > trunc_len)
 407                         alloc_size = trunc_len;
 408
 409                 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
 410                                                  phys_cpos, alloc_size,
 411                                                  &dealloc);
 412                 if (ret) {
 413                         mlog_errno(ret);
 414                         goto out;
 415                 }
 416
 417                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 418                 ocfs2_remove_xattr_clusters_from_cache(inode, block,
 419                                                        alloc_size);
 420                 cpos += alloc_size;
 421                 trunc_len -= alloc_size;
 422         }
 423
 424 out:
 425         ocfs2_schedule_truncate_log_flush(osb, 1);
 426         ocfs2_run_deallocs(osb, &dealloc);
 427
 428         return ret;
 429 }
 430
 431 static int ocfs2_xattr_value_truncate(struct inode *inode,
 432                                       struct buffer_head *root_bh,
 433                                       struct ocfs2_xattr_value_root *xv,
 434                                       int len)
 435 {
 436         int ret;
 437         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
 438         u32 old_clusters = le32_to_cpu(xv->xr_clusters);
 439
 440         if (new_clusters == old_clusters)
 441                 return 0;
 442
 443         if (new_clusters > old_clusters)
 444                 ret = ocfs2_xattr_extend_allocation(inode,
 445                                                     new_clusters - old_clusters,
 446                                                     root_bh, xv);
 447         else
 448                 ret = ocfs2_xattr_shrink_size(inode,
 449                                               old_clusters, new_clusters,
 450                                               root_bh, xv);
 451
 452         return ret;
 453 }
 454
 455 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
 456                                   size_t *result, const char *prefix,
 457                                   const char *name, int name_len)
 458 {
 459         char *p = buffer + *result;
 460         int prefix_len = strlen(prefix);
 461         int total_len = prefix_len + name_len + 1;
 462
 463         *result += total_len;
 464
 465         /* we are just looking for how big our buffer needs to be */
 466         if (!size)
 467                 return 0;
 468
 469         if (*result > size)
 470                 return -ERANGE;
 471
 472         memcpy(p, prefix, prefix_len);
 473         memcpy(p + prefix_len, name, name_len);
 474         p[prefix_len + name_len] = '\0';
 475
 476         return 0;
 477 }
 478
 479 static int ocfs2_xattr_list_entries(struct inode *inode,
 480                                     struct ocfs2_xattr_header *header,
 481                                     char *buffer, size_t buffer_size)
 482 {
 483         size_t result = 0;
 484         int i, type, ret;
 485         const char *prefix, *name;
 486
 487         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
 488                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 489                 type = ocfs2_xattr_get_type(entry);
 490                 prefix = ocfs2_xattr_prefix(type);
 491
 492                 if (prefix) {
 493                         name = (const char *)header +
 494                                 le16_to_cpu(entry->xe_name_offset);
 495
 496                         ret = ocfs2_xattr_list_entry(buffer, buffer_size,
 497                                                      &result, prefix, name,
 498                                                      entry->xe_name_len);
 499                         if (ret)
 500                                 return ret;
 501                 }
 502         }
 503
 504         return result;
 505 }
 506
 507 static int ocfs2_xattr_ibody_list(struct inode *inode,
 508                                   struct ocfs2_dinode *di,
 509                                   char *buffer,
 510                                   size_t buffer_size)
 511 {
 512         struct ocfs2_xattr_header *header = NULL;
 513         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 514         int ret = 0;
 515
 516         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 517                 return ret;
 518
 519         header = (struct ocfs2_xattr_header *)
 520                  ((void *)di + inode->i_sb->s_blocksize -
 521                  le16_to_cpu(di->i_xattr_inline_size));
 522
 523         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
 524
 525         return ret;
 526 }
 527
 528 static int ocfs2_xattr_block_list(struct inode *inode,
 529                                   struct ocfs2_dinode *di,
 530                                   char *buffer,
 531                                   size_t buffer_size)
 532 {
 533         struct buffer_head *blk_bh = NULL;
 534         struct ocfs2_xattr_block *xb;
 535         int ret = 0;
 536
 537         if (!di->i_xattr_loc)
 538                 return ret;
 539
 540         ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
 541         if (ret < 0) {
 542                 mlog_errno(ret);
 543                 return ret;
 544         }
 545         /*Verify the signature of xattr block*/
 546         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
 547                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
 548                 ret = -EFAULT;
 549                 goto cleanup;
 550         }
 551
 552         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 553
 554         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 555                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
 556                 ret = ocfs2_xattr_list_entries(inode, header,
 557                                                buffer, buffer_size);
 558         } else {
 559                 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
 560                 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
 561                                                    buffer, buffer_size);
 562         }
 563 cleanup:
 564         brelse(blk_bh);
 565
 566         return ret;
 567 }
 568
 569 ssize_t ocfs2_listxattr(struct dentry *dentry,
 570                         char *buffer,
 571                         size_t size)
 572 {
 573         int ret = 0, i_ret = 0, b_ret = 0;
 574         struct buffer_head *di_bh = NULL;
 575         struct ocfs2_dinode *di = NULL;
 576         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
 577
 578         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
 579                 return -EOPNOTSUPP;
 580
 581         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 582                 return ret;
 583
 584         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
 585         if (ret < 0) {
 586                 mlog_errno(ret);
 587                 return ret;
 588         }
 589
 590         di = (struct ocfs2_dinode *)di_bh->b_data;
 591
 592         down_read(&oi->ip_xattr_sem);
 593         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
 594         if (i_ret < 0)
 595                 b_ret = 0;
 596         else {
 597                 if (buffer) {
 598                         buffer += i_ret;
 599                         size -= i_ret;
 600                 }
 601                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
 602                                                buffer, size);
 603                 if (b_ret < 0)
 604                         i_ret = 0;
 605         }
 606         up_read(&oi->ip_xattr_sem);
 607         ocfs2_inode_unlock(dentry->d_inode, 0);
 608
 609         brelse(di_bh);
 610
 611         return i_ret + b_ret;
 612 }
 613
 614 static int ocfs2_xattr_find_entry(int name_index,
 615                                   const char *name,
 616                                   struct ocfs2_xattr_search *xs)
 617 {
 618         struct ocfs2_xattr_entry *entry;
 619         size_t name_len;
 620         int i, cmp = 1;
 621
 622         if (name == NULL)
 623                 return -EINVAL;
 624
 625         name_len = strlen(name);
 626         entry = xs->here;
 627         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
 628                 cmp = name_index - ocfs2_xattr_get_type(entry);
 629                 if (!cmp)
 630                         cmp = name_len - entry->xe_name_len;
 631                 if (!cmp)
 632                         cmp = memcmp(name, (xs->base +
 633                                      le16_to_cpu(entry->xe_name_offset)),
 634                                      name_len);
 635                 if (cmp == 0)
 636                         break;
 637                 entry += 1;
 638         }
 639         xs->here = entry;
 640
 641         return cmp ? -ENODATA : 0;
 642 }
 643
 644 static int ocfs2_xattr_get_value_outside(struct inode *inode,
 645                                          struct ocfs2_xattr_value_root *xv,
 646                                          void *buffer,
 647                                          size_t len)
 648 {
 649         u32 cpos, p_cluster, num_clusters, bpc, clusters;
 650         u64 blkno;
 651         int i, ret = 0;
 652         size_t cplen, blocksize;
 653         struct buffer_head *bh = NULL;
 654         struct ocfs2_extent_list *el;
 655
 656         el = &xv->xr_list;
 657         clusters = le32_to_cpu(xv->xr_clusters);
 658         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 659         blocksize = inode->i_sb->s_blocksize;
 660
 661         cpos = 0;
 662         while (cpos < clusters) {
 663                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 664                                                &num_clusters, el);
 665                 if (ret) {
 666                         mlog_errno(ret);
 667                         goto out;
 668                 }
 669
 670                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 671                 /* Copy ocfs2_xattr_value */
 672                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
 673                         ret = ocfs2_read_block(inode, blkno, &bh);
 674                         if (ret) {
 675                                 mlog_errno(ret);
 676                                 goto out;
 677                         }
 678
 679                         cplen = len >= blocksize ? blocksize : len;
 680                         memcpy(buffer, bh->b_data, cplen);
 681                         len -= cplen;
 682                         buffer += cplen;
 683
 684                         brelse(bh);
 685                         bh = NULL;
 686                         if (len == 0)
 687                                 break;
 688                 }
 689                 cpos += num_clusters;
 690         }
 691 out:
 692         return ret;
 693 }
 694
 695 static int ocfs2_xattr_ibody_get(struct inode *inode,
 696                                  int name_index,
 697                                  const char *name,
 698                                  void *buffer,
 699                                  size_t buffer_size,
 700                                  struct ocfs2_xattr_search *xs)
 701 {
 702         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 703         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
 704         struct ocfs2_xattr_value_root *xv;
 705         size_t size;
 706         int ret = 0;
 707
 708         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 709                 return -ENODATA;
 710
 711         xs->end = (void *)di + inode->i_sb->s_blocksize;
 712         xs->header = (struct ocfs2_xattr_header *)
 713                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
 714         xs->base = (void *)xs->header;
 715         xs->here = xs->header->xh_entries;
 716
 717         ret = ocfs2_xattr_find_entry(name_index, name, xs);
 718         if (ret)
 719                 return ret;
 720         size = le64_to_cpu(xs->here->xe_value_size);
 721         if (buffer) {
 722                 if (size > buffer_size)
 723                         return -ERANGE;
 724                 if (ocfs2_xattr_is_local(xs->here)) {
 725                         memcpy(buffer, (void *)xs->base +
 726                                le16_to_cpu(xs->here->xe_name_offset) +
 727                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
 728                 } else {
 729                         xv = (struct ocfs2_xattr_value_root *)
 730                                 (xs->base + le16_to_cpu(
 731                                  xs->here->xe_name_offset) +
 732                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
 733                         ret = ocfs2_xattr_get_value_outside(inode, xv,
 734                                                             buffer, size);
 735                         if (ret < 0) {
 736                                 mlog_errno(ret);
 737                                 return ret;
 738                         }
 739                 }
 740         }
 741
 742         return size;
 743 }
 744
 745 static int ocfs2_xattr_block_get(struct inode *inode,
 746                                  int name_index,
 747                                  const char *name,
 748                                  void *buffer,
 749                                  size_t buffer_size,
 750                                  struct ocfs2_xattr_search *xs)
 751 {
 752         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
 753         struct buffer_head *blk_bh = NULL;
 754         struct ocfs2_xattr_block *xb;
 755         struct ocfs2_xattr_value_root *xv;
 756         size_t size;
 757         int ret = -ENODATA, name_offset, name_len, block_off, i;
 758
 759         if (!di->i_xattr_loc)
 760                 return ret;
 761
 762         memset(&xs->bucket, 0, sizeof(xs->bucket));
 763
 764         ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
 765         if (ret < 0) {
 766                 mlog_errno(ret);
 767                 return ret;
 768         }
 769         /*Verify the signature of xattr block*/
 770         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
 771                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
 772                 ret = -EFAULT;
 773                 goto cleanup;
 774         }
 775
 776         xs->xattr_bh = blk_bh;
 777         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 778
 779         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 780                 xs->header = &xb->xb_attrs.xb_header;
 781                 xs->base = (void *)xs->header;
 782                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
 783                 xs->here = xs->header->xh_entries;
 784
 785                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
 786         } else
 787                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
 788                                                    name_index,
 789                                                    name, xs);
 790
 791         if (ret)
 792                 goto cleanup;
 793         size = le64_to_cpu(xs->here->xe_value_size);
 794         if (buffer) {
 795                 ret = -ERANGE;
 796                 if (size > buffer_size)
 797                         goto cleanup;
 798
 799                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
 800                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
 801                 i = xs->here - xs->header->xh_entries;
 802
 803                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
 804                         ret = ocfs2_xattr_bucket_get_name_value(inode,
 805                                                                 xs->bucket.xh,
 806                                                                 i,
 807                                                                 &block_off,
 808                                                                 &name_offset);
 809                         xs->base = xs->bucket.bhs[block_off]->b_data;
 810                 }
 811                 if (ocfs2_xattr_is_local(xs->here)) {
 812                         memcpy(buffer, (void *)xs->base +
 813                                name_offset + name_len, size);
 814                 } else {
 815                         xv = (struct ocfs2_xattr_value_root *)
 816                                 (xs->base + name_offset + name_len);
 817                         ret = ocfs2_xattr_get_value_outside(inode, xv,
 818                                                             buffer, size);
 819                         if (ret < 0) {
 820                                 mlog_errno(ret);
 821                                 goto cleanup;
 822                         }
 823                 }
 824         }
 825         ret = size;
 826 cleanup:
 827         for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
 828                 brelse(xs->bucket.bhs[i]);
 829         memset(&xs->bucket, 0, sizeof(xs->bucket));
 830
 831         brelse(blk_bh);
 832         return ret;
 833 }
 834
 835 /* ocfs2_xattr_get()
 836  *
 837  * Copy an extended attribute into the buffer provided.
 838  * Buffer is NULL to compute the size of buffer required.
 839  */
 840 int ocfs2_xattr_get(struct inode *inode,
 841                     int name_index,
 842                     const char *name,
 843                     void *buffer,
 844                     size_t buffer_size)
 845 {
 846         int ret;
 847         struct ocfs2_dinode *di = NULL;
 848         struct buffer_head *di_bh = NULL;
 849         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 850         struct ocfs2_xattr_search xis = {
 851                 .not_found = -ENODATA,
 852         };
 853         struct ocfs2_xattr_search xbs = {
 854                 .not_found = -ENODATA,
 855         };
 856
 857         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
 858                 return -EOPNOTSUPP;
 859
 860         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 861                 ret = -ENODATA;
 862
 863         ret = ocfs2_inode_lock(inode, &di_bh, 0);
 864         if (ret < 0) {
 865                 mlog_errno(ret);
 866                 return ret;
 867         }
 868         xis.inode_bh = xbs.inode_bh = di_bh;
 869         di = (struct ocfs2_dinode *)di_bh->b_data;
 870
 871         down_read(&oi->ip_xattr_sem);
 872         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
 873                                     buffer_size, &xis);
 874         if (ret == -ENODATA)
 875                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
 876                                             buffer_size, &xbs);
 877         up_read(&oi->ip_xattr_sem);
 878         ocfs2_inode_unlock(inode, 0);
 879
 880         brelse(di_bh);
 881
 882         return ret;
 883 }
 884
 885 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
 886                                            struct ocfs2_xattr_value_root *xv,
 887                                            const void *value,
 888                                            int value_len)
 889 {
 890         int ret = 0, i, cp_len, credits;
 891         u16 blocksize = inode->i_sb->s_blocksize;
 892         u32 p_cluster, num_clusters;
 893         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 894         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
 895         u64 blkno;
 896         struct buffer_head *bh = NULL;
 897         handle_t *handle;
 898
 899         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
 900
 901         credits = clusters * bpc;
 902         handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
 903         if (IS_ERR(handle)) {
 904                 ret = PTR_ERR(handle);
 905                 mlog_errno(ret);
 906                 goto out;
 907         }
 908
 909         while (cpos < clusters) {
 910                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 911                                                &num_clusters, &xv->xr_list);
 912                 if (ret) {
 913                         mlog_errno(ret);
 914                         goto out_commit;
 915                 }
 916
 917                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 918
 919                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
 920                         ret = ocfs2_read_block(inode, blkno, &bh);
 921                         if (ret) {
 922                                 mlog_errno(ret);
 923                                 goto out_commit;
 924                         }
 925
 926                         ret = ocfs2_journal_access(handle,
 927                                                    inode,
 928                                                    bh,
 929                                                    OCFS2_JOURNAL_ACCESS_WRITE);
 930                         if (ret < 0) {
 931                                 mlog_errno(ret);
 932                                 goto out_commit;
 933                         }
 934
 935                         cp_len = value_len > blocksize ? blocksize : value_len;
 936                         memcpy(bh->b_data, value, cp_len);
 937                         value_len -= cp_len;
 938                         value += cp_len;
 939                         if (cp_len < blocksize)
 940                                 memset(bh->b_data + cp_len, 0,
 941                                        blocksize - cp_len);
 942
 943                         ret = ocfs2_journal_dirty(handle, bh);
 944                         if (ret < 0) {
 945                                 mlog_errno(ret);
 946                                 goto out_commit;
 947                         }
 948                         brelse(bh);
 949                         bh = NULL;
 950
 951                         /*
 952                          * XXX: do we need to empty all the following
 953                          * blocks in this cluster?
 954                          */
 955                         if (!value_len)
 956                                 break;
 957                 }
 958                 cpos += num_clusters;
 959         }
 960 out_commit:
 961         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 962 out:
 963         brelse(bh);
 964
 965         return ret;
 966 }
 967
 968 static int ocfs2_xattr_cleanup(struct inode *inode,
 969                                struct ocfs2_xattr_info *xi,
 970                                struct ocfs2_xattr_search *xs,
 971                                size_t offs)
 972 {
 973         handle_t *handle = NULL;
 974         int ret = 0;
 975         size_t name_len = strlen(xi->name);
 976         void *val = xs->base + offs;
 977         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 978
 979         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
 980                                    OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
 981         if (IS_ERR(handle)) {
 982                 ret = PTR_ERR(handle);
 983                 mlog_errno(ret);
 984                 goto out;
 985         }
 986         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
 987                                    OCFS2_JOURNAL_ACCESS_WRITE);
 988         if (ret) {
 989                 mlog_errno(ret);
 990                 goto out_commit;
 991         }
 992         /* Decrease xattr count */
 993         le16_add_cpu(&xs->header->xh_count, -1);
 994         /* Remove the xattr entry and tree root which has already be set*/
 995         memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
 996         memset(val, 0, size);
 997
 998         ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
 999         if (ret < 0)
1000                 mlog_errno(ret);
1001 out_commit:
1002         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1003 out:
1004         return ret;
1005 }
1006
1007 static int ocfs2_xattr_update_entry(struct inode *inode,
1008                                     struct ocfs2_xattr_info *xi,
1009                                     struct ocfs2_xattr_search *xs,
1010                                     size_t offs)
1011 {
1012         handle_t *handle = NULL;
1013         int ret = 0;
1014
1015         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1016                                    OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1017         if (IS_ERR(handle)) {
1018                 ret = PTR_ERR(handle);
1019                 mlog_errno(ret);
1020                 goto out;
1021         }
1022         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1023                                    OCFS2_JOURNAL_ACCESS_WRITE);
1024         if (ret) {
1025                 mlog_errno(ret);
1026                 goto out_commit;
1027         }
1028
1029         xs->here->xe_name_offset = cpu_to_le16(offs);
1030         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1031         if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1032                 ocfs2_xattr_set_local(xs->here, 1);
1033         else
1034                 ocfs2_xattr_set_local(xs->here, 0);
1035         ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1036
1037         ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1038         if (ret < 0)
1039                 mlog_errno(ret);
1040 out_commit:
1041         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1042 out:
1043         return ret;
1044 }
1045
1046 /*
1047  * ocfs2_xattr_set_value_outside()
1048  *
1049  * Set large size value in B tree.
1050  */
1051 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1052                                          struct ocfs2_xattr_info *xi,
1053                                          struct ocfs2_xattr_search *xs,
1054                                          size_t offs)
1055 {
1056         size_t name_len = strlen(xi->name);
1057         void *val = xs->base + offs;
1058         struct ocfs2_xattr_value_root *xv = NULL;
1059         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1060         int ret = 0;
1061
1062         memset(val, 0, size);
1063         memcpy(val, xi->name, name_len);
1064         xv = (struct ocfs2_xattr_value_root *)
1065                 (val + OCFS2_XATTR_SIZE(name_len));
1066         xv->xr_clusters = 0;
1067         xv->xr_last_eb_blk = 0;
1068         xv->xr_list.l_tree_depth = 0;
1069         xv->xr_list.l_count = cpu_to_le16(1);
1070         xv->xr_list.l_next_free_rec = 0;
1071
1072         ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
1073                                          xi->value_len);
1074         if (ret < 0) {
1075                 mlog_errno(ret);
1076                 return ret;
1077         }
1078         ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
1079                                               xi->value_len);
1080         if (ret < 0) {
1081                 mlog_errno(ret);
1082                 return ret;
1083         }
1084         ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
1085         if (ret < 0)
1086                 mlog_errno(ret);
1087
1088         return ret;
1089 }
1090
1091 /*
1092  * ocfs2_xattr_set_entry_local()
1093  *
1094  * Set, replace or remove extended attribute in local.
1095  */
1096 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1097                                         struct ocfs2_xattr_info *xi,
1098                                         struct ocfs2_xattr_search *xs,
1099                                         struct ocfs2_xattr_entry *last,
1100                                         size_t min_offs)
1101 {
1102         size_t name_len = strlen(xi->name);
1103         int i;
1104
1105         if (xi->value && xs->not_found) {
1106                 /* Insert the new xattr entry. */
1107                 le16_add_cpu(&xs->header->xh_count, 1);
1108                 ocfs2_xattr_set_type(last, xi->name_index);
1109                 ocfs2_xattr_set_local(last, 1);
1110                 last->xe_name_len = name_len;
1111         } else {
1112                 void *first_val;
1113                 void *val;
1114                 size_t offs, size;
1115
1116                 first_val = xs->base + min_offs;
1117                 offs = le16_to_cpu(xs->here->xe_name_offset);
1118                 val = xs->base + offs;
1119
1120                 if (le64_to_cpu(xs->here->xe_value_size) >
1121                     OCFS2_XATTR_INLINE_SIZE)
1122                         size = OCFS2_XATTR_SIZE(name_len) +
1123                                 OCFS2_XATTR_ROOT_SIZE;
1124                 else
1125                         size = OCFS2_XATTR_SIZE(name_len) +
1126                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1127
1128                 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1129                                 OCFS2_XATTR_SIZE(xi->value_len)) {
1130                         /* The old and the new value have the
1131                            same size. Just replace the value. */
1132                         ocfs2_xattr_set_local(xs->here, 1);
1133                         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1134                         /* Clear value bytes. */
1135                         memset(val + OCFS2_XATTR_SIZE(name_len),
1136                                0,
1137                                OCFS2_XATTR_SIZE(xi->value_len));
1138                         memcpy(val + OCFS2_XATTR_SIZE(name_len),
1139                                xi->value,
1140                                xi->value_len);
1141                         return;
1142                 }
1143                 /* Remove the old name+value. */
1144                 memmove(first_val + size, first_val, val - first_val);
1145                 memset(first_val, 0, size);
1146                 xs->here->xe_name_hash = 0;
1147                 xs->here->xe_name_offset = 0;
1148                 ocfs2_xattr_set_local(xs->here, 1);
1149                 xs->here->xe_value_size = 0;
1150
1151                 min_offs += size;
1152
1153                 /* Adjust all value offsets. */
1154                 last = xs->header->xh_entries;
1155                 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1156                         size_t o = le16_to_cpu(last->xe_name_offset);
1157
1158                         if (o < offs)
1159                                 last->xe_name_offset = cpu_to_le16(o + size);
1160                         last += 1;
1161                 }
1162
1163                 if (!xi->value) {
1164                         /* Remove the old entry. */
1165                         last -= 1;
1166                         memmove(xs->here, xs->here + 1,
1167                                 (void *)last - (void *)xs->here);
1168                         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1169                         le16_add_cpu(&xs->header->xh_count, -1);
1170                 }
1171         }
1172         if (xi->value) {
1173                 /* Insert the new name+value. */
1174                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1175                                 OCFS2_XATTR_SIZE(xi->value_len);
1176                 void *val = xs->base + min_offs - size;
1177
1178                 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1179                 memset(val, 0, size);
1180                 memcpy(val, xi->name, name_len);
1181                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1182                        xi->value,
1183                        xi->value_len);
1184                 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1185                 ocfs2_xattr_set_local(xs->here, 1);
1186                 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1187         }
1188
1189         return;
1190 }
1191
1192 /*
1193  * ocfs2_xattr_set_entry()
1194  *
1195  * Set extended attribute entry into inode or block.
1196  *
1197  * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1198  * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1199  * then set value in B tree with set_value_outside().
1200  */
1201 static int ocfs2_xattr_set_entry(struct inode *inode,
1202                                  struct ocfs2_xattr_info *xi,
1203                                  struct ocfs2_xattr_search *xs,
1204                                  int flag)
1205 {
1206         struct ocfs2_xattr_entry *last;
1207         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1208         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1209         size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1210         size_t size_l = 0;
1211         handle_t *handle = NULL;
1212         int free, i, ret;
1213         struct ocfs2_xattr_info xi_l = {
1214                 .name_index = xi->name_index,
1215                 .name = xi->name,
1216                 .value = xi->value,
1217                 .value_len = xi->value_len,
1218         };
1219
1220         /* Compute min_offs, last and free space. */
1221         last = xs->header->xh_entries;
1222
1223         for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1224                 size_t offs = le16_to_cpu(last->xe_name_offset);
1225                 if (offs < min_offs)
1226                         min_offs = offs;
1227                 last += 1;
1228         }
1229
1230         free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
1231         if (free < 0)
1232                 return -EFAULT;
1233
1234         if (!xs->not_found) {
1235                 size_t size = 0;
1236                 if (ocfs2_xattr_is_local(xs->here))
1237                         size = OCFS2_XATTR_SIZE(name_len) +
1238                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1239                 else
1240                         size = OCFS2_XATTR_SIZE(name_len) +
1241                                 OCFS2_XATTR_ROOT_SIZE;
1242                 free += (size + sizeof(struct ocfs2_xattr_entry));
1243         }
1244         /* Check free space in inode or block */
1245         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1246                 if (free < sizeof(struct ocfs2_xattr_entry) +
1247                            OCFS2_XATTR_SIZE(name_len) +
1248                            OCFS2_XATTR_ROOT_SIZE) {
1249                         ret = -ENOSPC;
1250                         goto out;
1251                 }
1252                 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1253                 xi_l.value = (void *)&def_xv;
1254                 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1255         } else if (xi->value) {
1256                 if (free < sizeof(struct ocfs2_xattr_entry) +
1257                            OCFS2_XATTR_SIZE(name_len) +
1258                            OCFS2_XATTR_SIZE(xi->value_len)) {
1259                         ret = -ENOSPC;
1260                         goto out;
1261                 }
1262         }
1263
1264         if (!xs->not_found) {
1265                 /* For existing extended attribute */
1266                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1267                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1268                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1269                 void *val = xs->base + offs;
1270
1271                 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1272                         /* Replace existing local xattr with tree root */
1273                         ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1274                                                             offs);
1275                         if (ret < 0)
1276                                 mlog_errno(ret);
1277                         goto out;
1278                 } else if (!ocfs2_xattr_is_local(xs->here)) {
1279                         /* For existing xattr which has value outside */
1280                         struct ocfs2_xattr_value_root *xv = NULL;
1281                         xv = (struct ocfs2_xattr_value_root *)(val +
1282                                 OCFS2_XATTR_SIZE(name_len));
1283
1284                         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1285                                 /*
1286                                  * If new value need set outside also,
1287                                  * first truncate old value to new value,
1288                                  * then set new value with set_value_outside().
1289                                  */
1290                                 ret = ocfs2_xattr_value_truncate(inode,
1291                                                                  xs->xattr_bh,
1292                                                                  xv,
1293                                                                  xi->value_len);
1294                                 if (ret < 0) {
1295                                         mlog_errno(ret);
1296                                         goto out;
1297                                 }
1298
1299                                 ret = __ocfs2_xattr_set_value_outside(inode,
1300                                                                 xv,
1301                                                                 xi->value,
1302                                                                 xi->value_len);
1303                                 if (ret < 0) {
1304                                         mlog_errno(ret);
1305                                         goto out;
1306                                 }
1307
1308                                 ret = ocfs2_xattr_update_entry(inode,
1309                                                                xi,
1310                                                                xs,
1311                                                                offs);
1312                                 if (ret < 0)
1313                                         mlog_errno(ret);
1314                                 goto out;
1315                         } else {
1316                                 /*
1317                                  * If new value need set in local,
1318                                  * just trucate old value to zero.
1319                                  */
1320                                  ret = ocfs2_xattr_value_truncate(inode,
1321                                                                  xs->xattr_bh,
1322                                                                  xv,
1323                                                                  0);
1324                                 if (ret < 0)
1325                                         mlog_errno(ret);
1326                         }
1327                 }
1328         }
1329
1330         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1331                                    OCFS2_INODE_UPDATE_CREDITS);
1332         if (IS_ERR(handle)) {
1333                 ret = PTR_ERR(handle);
1334                 mlog_errno(ret);
1335                 goto out;
1336         }
1337
1338         ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1339                                    OCFS2_JOURNAL_ACCESS_WRITE);
1340         if (ret) {
1341                 mlog_errno(ret);
1342                 goto out_commit;
1343         }
1344
1345         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1346                 /* set extended attribute in external block. */
1347                 ret = ocfs2_extend_trans(handle,
1348                                          OCFS2_INODE_UPDATE_CREDITS +
1349                                          OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1350                 if (ret) {
1351                         mlog_errno(ret);
1352                         goto out_commit;
1353                 }
1354                 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1355                                            OCFS2_JOURNAL_ACCESS_WRITE);
1356                 if (ret) {
1357                         mlog_errno(ret);
1358                         goto out_commit;
1359                 }
1360         }
1361
1362         /*
1363          * Set value in local, include set tree root in local.
1364          * This is the first step for value size >INLINE_SIZE.
1365          */
1366         ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1367
1368         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1369                 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1370                 if (ret < 0) {
1371                         mlog_errno(ret);
1372                         goto out_commit;
1373                 }
1374         }
1375
1376         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1377             (flag & OCFS2_INLINE_XATTR_FL)) {
1378                 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1379                 unsigned int xattrsize = osb->s_xattr_inline_size;
1380
1381                 /*
1382                  * Adjust extent record count or inline data size
1383                  * to reserve space for extended attribute.
1384                  */
1385                 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1386                         struct ocfs2_inline_data *idata = &di->id2.i_data;
1387                         le16_add_cpu(&idata->id_count, -xattrsize);
1388                 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1389                         struct ocfs2_extent_list *el = &di->id2.i_list;
1390                         le16_add_cpu(&el->l_count, -(xattrsize /
1391                                         sizeof(struct ocfs2_extent_rec)));
1392                 }
1393                 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1394         }
1395         /* Update xattr flag */
1396         spin_lock(&oi->ip_lock);
1397         oi->ip_dyn_features |= flag;
1398         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1399         spin_unlock(&oi->ip_lock);
1400         /* Update inode ctime */
1401         inode->i_ctime = CURRENT_TIME;
1402         di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1403         di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1404
1405         ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1406         if (ret < 0)
1407                 mlog_errno(ret);
1408
1409 out_commit:
1410         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1411
1412         if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1413                 /*
1414                  * Set value outside in B tree.
1415                  * This is the second step for value size > INLINE_SIZE.
1416                  */
1417                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1418                 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
1419                 if (ret < 0) {
1420                         int ret2;
1421
1422                         mlog_errno(ret);
1423                         /*
1424                          * If set value outside failed, we have to clean
1425                          * the junk tree root we have already set in local.
1426                          */
1427                         ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
1428                         if (ret2 < 0)
1429                                 mlog_errno(ret2);
1430                 }
1431         }
1432 out:
1433         return ret;
1434
1435 }
1436
1437 static int ocfs2_remove_value_outside(struct inode*inode,
1438                                       struct buffer_head *bh,
1439                                       struct ocfs2_xattr_header *header)
1440 {
1441         int ret = 0, i;
1442
1443         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1444                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1445
1446                 if (!ocfs2_xattr_is_local(entry)) {
1447                         struct ocfs2_xattr_value_root *xv;
1448                         void *val;
1449
1450                         val = (void *)header +
1451                                 le16_to_cpu(entry->xe_name_offset);
1452                         xv = (struct ocfs2_xattr_value_root *)
1453                                 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1454                         ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
1455                         if (ret < 0) {
1456                                 mlog_errno(ret);
1457                                 return ret;
1458                         }
1459                 }
1460         }
1461
1462         return ret;
1463 }
1464
1465 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1466                                     struct buffer_head *di_bh)
1467 {
1468
1469         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1470         struct ocfs2_xattr_header *header;
1471         int ret;
1472
1473         header = (struct ocfs2_xattr_header *)
1474                  ((void *)di + inode->i_sb->s_blocksize -
1475                  le16_to_cpu(di->i_xattr_inline_size));
1476
1477         ret = ocfs2_remove_value_outside(inode, di_bh, header);
1478
1479         return ret;
1480 }
1481
1482 static int ocfs2_xattr_block_remove(struct inode *inode,
1483                                     struct buffer_head *blk_bh)
1484 {
1485         struct ocfs2_xattr_block *xb;
1486         int ret = 0;
1487
1488         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1489         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1490                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1491                 ret = ocfs2_remove_value_outside(inode, blk_bh, header);
1492         } else
1493                 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
1494
1495         return ret;
1496 }
1497
1498 static int ocfs2_xattr_free_block(struct inode *inode,
1499                                   u64 block)
1500 {
1501         struct inode *xb_alloc_inode;
1502         struct buffer_head *xb_alloc_bh = NULL;
1503         struct buffer_head *blk_bh = NULL;
1504         struct ocfs2_xattr_block *xb;
1505         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1506         handle_t *handle;
1507         int ret = 0;
1508         u64 blk, bg_blkno;
1509         u16 bit;
1510
1511         ret = ocfs2_read_block(inode, block, &blk_bh);
1512         if (ret < 0) {
1513                 mlog_errno(ret);
1514                 goto out;
1515         }
1516
1517         /*Verify the signature of xattr block*/
1518         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1519                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1520                 ret = -EFAULT;
1521                 goto out;
1522         }
1523
1524         ret = ocfs2_xattr_block_remove(inode, blk_bh);
1525         if (ret < 0) {
1526                 mlog_errno(ret);
1527                 goto out;
1528         }
1529
1530         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1531         blk = le64_to_cpu(xb->xb_blkno);
1532         bit = le16_to_cpu(xb->xb_suballoc_bit);
1533         bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1534
1535         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1536                                 EXTENT_ALLOC_SYSTEM_INODE,
1537                                 le16_to_cpu(xb->xb_suballoc_slot));
1538         if (!xb_alloc_inode) {
1539                 ret = -ENOMEM;
1540                 mlog_errno(ret);
1541                 goto out;
1542         }
1543         mutex_lock(&xb_alloc_inode->i_mutex);
1544
1545         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1546         if (ret < 0) {
1547                 mlog_errno(ret);
1548                 goto out_mutex;
1549         }
1550
1551         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1552         if (IS_ERR(handle)) {
1553                 ret = PTR_ERR(handle);
1554                 mlog_errno(ret);
1555                 goto out_unlock;
1556         }
1557
1558         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1559                                        bit, bg_blkno, 1);
1560         if (ret < 0)
1561                 mlog_errno(ret);
1562
1563         ocfs2_commit_trans(osb, handle);
1564 out_unlock:
1565         ocfs2_inode_unlock(xb_alloc_inode, 1);
1566         brelse(xb_alloc_bh);
1567 out_mutex:
1568         mutex_unlock(&xb_alloc_inode->i_mutex);
1569         iput(xb_alloc_inode);
1570 out:
1571         brelse(blk_bh);
1572         return ret;
1573 }
1574
1575 /*
1576  * ocfs2_xattr_remove()
1577  *
1578  * Free extended attribute resources associated with this inode.
1579  */
1580 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1581 {
1582         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1583         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1584         handle_t *handle;
1585         int ret;
1586
1587         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1588                 return 0;
1589
1590         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1591                 return 0;
1592
1593         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1594                 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1595                 if (ret < 0) {
1596                         mlog_errno(ret);
1597                         goto out;
1598                 }
1599         }
1600
1601         if (di->i_xattr_loc) {
1602                 ret = ocfs2_xattr_free_block(inode,
1603                                              le64_to_cpu(di->i_xattr_loc));
1604                 if (ret < 0) {
1605                         mlog_errno(ret);
1606                         goto out;
1607                 }
1608         }
1609
1610         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1611                                    OCFS2_INODE_UPDATE_CREDITS);
1612         if (IS_ERR(handle)) {
1613                 ret = PTR_ERR(handle);
1614                 mlog_errno(ret);
1615                 goto out;
1616         }
1617         ret = ocfs2_journal_access(handle, inode, di_bh,
1618                                    OCFS2_JOURNAL_ACCESS_WRITE);
1619         if (ret) {
1620                 mlog_errno(ret);
1621                 goto out_commit;
1622         }
1623
1624         di->i_xattr_loc = 0;
1625
1626         spin_lock(&oi->ip_lock);
1627         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1628         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1629         spin_unlock(&oi->ip_lock);
1630
1631         ret = ocfs2_journal_dirty(handle, di_bh);
1632         if (ret < 0)
1633                 mlog_errno(ret);
1634 out_commit:
1635         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1636 out:
1637         return ret;
1638 }
1639
1640 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1641                                         struct ocfs2_dinode *di)
1642 {
1643         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1644         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1645         int free;
1646
1647         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1648                 return 0;
1649
1650         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1651                 struct ocfs2_inline_data *idata = &di->id2.i_data;
1652                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1653         } else if (ocfs2_inode_is_fast_symlink(inode)) {
1654                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1655                         le64_to_cpu(di->i_size);
1656         } else {
1657                 struct ocfs2_extent_list *el = &di->id2.i_list;
1658                 free = (le16_to_cpu(el->l_count) -
1659                         le16_to_cpu(el->l_next_free_rec)) *
1660                         sizeof(struct ocfs2_extent_rec);
1661         }
1662         if (free >= xattrsize)
1663                 return 1;
1664
1665         return 0;
1666 }
1667
1668 /*
1669  * ocfs2_xattr_ibody_find()
1670  *
1671  * Find extended attribute in inode block and
1672  * fill search info into struct ocfs2_xattr_search.
1673  */
1674 static int ocfs2_xattr_ibody_find(struct inode *inode,
1675                                   int name_index,
1676                                   const char *name,
1677                                   struct ocfs2_xattr_search *xs)
1678 {
1679         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1680         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1681         int ret;
1682         int has_space = 0;
1683
1684         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1685                 return 0;
1686
1687         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1688                 down_read(&oi->ip_alloc_sem);
1689                 has_space = ocfs2_xattr_has_space_inline(inode, di);
1690                 up_read(&oi->ip_alloc_sem);
1691                 if (!has_space)
1692                         return 0;
1693         }
1694
1695         xs->xattr_bh = xs->inode_bh;
1696         xs->end = (void *)di + inode->i_sb->s_blocksize;
1697         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1698                 xs->header = (struct ocfs2_xattr_header *)
1699                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1700         else
1701                 xs->header = (struct ocfs2_xattr_header *)
1702                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1703         xs->base = (void *)xs->header;
1704         xs->here = xs->header->xh_entries;
1705
1706         /* Find the named attribute. */
1707         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1708                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1709                 if (ret && ret != -ENODATA)
1710                         return ret;
1711                 xs->not_found = ret;
1712         }
1713
1714         return 0;
1715 }
1716
1717 /*
1718  * ocfs2_xattr_ibody_set()
1719  *
1720  * Set, replace or remove an extended attribute into inode block.
1721  *
1722  */
1723 static int ocfs2_xattr_ibody_set(struct inode *inode,
1724                                  struct ocfs2_xattr_info *xi,
1725                                  struct ocfs2_xattr_search *xs)
1726 {
1727         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1728         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1729         int ret;
1730
1731         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1732                 return -ENOSPC;
1733
1734         down_write(&oi->ip_alloc_sem);
1735         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1736                 if (!ocfs2_xattr_has_space_inline(inode, di)) {
1737                         ret = -ENOSPC;
1738                         goto out;
1739                 }
1740         }
1741
1742         ret = ocfs2_xattr_set_entry(inode, xi, xs,
1743                                 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
1744 out:
1745         up_write(&oi->ip_alloc_sem);
1746
1747         return ret;
1748 }
1749
1750 /*
1751  * ocfs2_xattr_block_find()
1752  *
1753  * Find extended attribute in external block and
1754  * fill search info into struct ocfs2_xattr_search.
1755  */
1756 static int ocfs2_xattr_block_find(struct inode *inode,
1757                                   int name_index,
1758                                   const char *name,
1759                                   struct ocfs2_xattr_search *xs)
1760 {
1761         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1762         struct buffer_head *blk_bh = NULL;
1763         struct ocfs2_xattr_block *xb;
1764         int ret = 0;
1765
1766         if (!di->i_xattr_loc)
1767                 return ret;
1768
1769         ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
1770         if (ret < 0) {
1771                 mlog_errno(ret);
1772                 return ret;
1773         }
1774         /*Verify the signature of xattr block*/
1775         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1776                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1777                         ret = -EFAULT;
1778                         goto cleanup;
1779         }
1780
1781         xs->xattr_bh = blk_bh;
1782         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1783
1784         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1785                 xs->header = &xb->xb_attrs.xb_header;
1786                 xs->base = (void *)xs->header;
1787                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
1788                 xs->here = xs->header->xh_entries;
1789
1790                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1791         } else
1792                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
1793                                                    name_index,
1794                                                    name, xs);
1795
1796         if (ret && ret != -ENODATA) {
1797                 xs->xattr_bh = NULL;
1798                 goto cleanup;
1799         }
1800         xs->not_found = ret;
1801         return 0;
1802 cleanup:
1803         brelse(blk_bh);
1804
1805         return ret;
1806 }
1807
1808 /*
1809  * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
1810  * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
1811  * re-initialized.
1812  */
1813 static int ocfs2_restore_xattr_block(struct inode *inode,
1814                                      struct ocfs2_xattr_search *xs)
1815 {
1816         int ret;
1817         handle_t *handle;
1818         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1819         struct ocfs2_xattr_block *xb =
1820                 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1821         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
1822         u16 xb_flags = le16_to_cpu(xb->xb_flags);
1823
1824         BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
1825                 le16_to_cpu(el->l_next_free_rec) != 0);
1826
1827         handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1828         if (IS_ERR(handle)) {
1829                 ret = PTR_ERR(handle);
1830                 handle = NULL;
1831                 goto out;
1832         }
1833
1834         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1835                                    OCFS2_JOURNAL_ACCESS_WRITE);
1836         if (ret < 0) {
1837                 mlog_errno(ret);
1838                 goto out_commit;
1839         }
1840
1841         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
1842                offsetof(struct ocfs2_xattr_block, xb_attrs));
1843
1844         xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);
1845
1846         ocfs2_journal_dirty(handle, xs->xattr_bh);
1847
1848 out_commit:
1849         ocfs2_commit_trans(osb, handle);
1850 out:
1851         return ret;
1852 }
1853
1854 /*
1855  * ocfs2_xattr_block_set()
1856  *
1857  * Set, replace or remove an extended attribute into external block.
1858  *
1859  */
1860 static int ocfs2_xattr_block_set(struct inode *inode,
1861                                  struct ocfs2_xattr_info *xi,
1862                                  struct ocfs2_xattr_search *xs)
1863 {
1864         struct buffer_head *new_bh = NULL;
1865         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1866         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)xs->inode_bh->b_data;
1867         struct ocfs2_alloc_context *meta_ac = NULL;
1868         handle_t *handle = NULL;
1869         struct ocfs2_xattr_block *xblk = NULL;
1870         u16 suballoc_bit_start;
1871         u32 num_got;
1872         u64 first_blkno;
1873         int ret;
1874
1875         if (!xs->xattr_bh) {
1876                 /*
1877                  * Alloc one external block for extended attribute
1878                  * outside of inode.
1879                  */
1880                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
1881                 if (ret < 0) {
1882                         mlog_errno(ret);
1883                         goto out;
1884                 }
1885                 handle = ocfs2_start_trans(osb,
1886                                            OCFS2_XATTR_BLOCK_CREATE_CREDITS);
1887                 if (IS_ERR(handle)) {
1888                         ret = PTR_ERR(handle);
1889                         mlog_errno(ret);
1890                         goto out;
1891                 }
1892                 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1893                                            OCFS2_JOURNAL_ACCESS_CREATE);
1894                 if (ret < 0) {
1895                         mlog_errno(ret);
1896                         goto out_commit;
1897                 }
1898
1899                 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
1900                                            &suballoc_bit_start, &num_got,
1901                                            &first_blkno);
1902                 if (ret < 0) {
1903                         mlog_errno(ret);
1904                         goto out_commit;
1905                 }
1906
1907                 new_bh = sb_getblk(inode->i_sb, first_blkno);
1908                 ocfs2_set_new_buffer_uptodate(inode, new_bh);
1909
1910                 ret = ocfs2_journal_access(handle, inode, new_bh,
1911                                            OCFS2_JOURNAL_ACCESS_CREATE);
1912                 if (ret < 0) {
1913                         mlog_errno(ret);
1914                         goto out_commit;
1915                 }
1916
1917                 /* Initialize ocfs2_xattr_block */
1918                 xs->xattr_bh = new_bh;
1919                 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
1920                 memset(xblk, 0, inode->i_sb->s_blocksize);
1921                 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
1922                 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
1923                 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1924                 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
1925                 xblk->xb_blkno = cpu_to_le64(first_blkno);
1926
1927                 xs->header = &xblk->xb_attrs.xb_header;
1928                 xs->base = (void *)xs->header;
1929                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
1930                 xs->here = xs->header->xh_entries;
1931
1932
1933                 ret = ocfs2_journal_dirty(handle, new_bh);
1934                 if (ret < 0) {
1935                         mlog_errno(ret);
1936                         goto out_commit;
1937                 }
1938                 di->i_xattr_loc = cpu_to_le64(first_blkno);
1939                 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1940                 if (ret < 0)
1941                         mlog_errno(ret);
1942 out_commit:
1943                 ocfs2_commit_trans(osb, handle);
1944 out:
1945                 if (meta_ac)
1946                         ocfs2_free_alloc_context(meta_ac);
1947                 if (ret < 0)
1948                         return ret;
1949         } else
1950                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1951
1952         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
1953                 /* Set extended attribute into external block */
1954                 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
1955                 if (!ret || ret != -ENOSPC)
1956                         goto end;
1957
1958                 ret = ocfs2_xattr_create_index_block(inode, xs);
1959                 if (ret)
1960                         goto end;
1961         }
1962
1963         ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
1964         if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
1965                 ret = ocfs2_restore_xattr_block(inode, xs);
1966
1967 end:
1968
1969         return ret;
1970 }
1971
1972 /*
1973  * ocfs2_xattr_set()
1974  *
1975  * Set, replace or remove an extended attribute for this inode.
1976  * value is NULL to remove an existing extended attribute, else either
1977  * create or replace an extended attribute.
1978  */
1979 int ocfs2_xattr_set(struct inode *inode,
1980                     int name_index,
1981                     const char *name,
1982                     const void *value,
1983                     size_t value_len,
1984                     int flags)
1985 {
1986         struct buffer_head *di_bh = NULL;
1987         struct ocfs2_dinode *di;
1988         int ret;
1989         u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
1990
1991         struct ocfs2_xattr_info xi = {
1992                 .name_index = name_index,
1993                 .name = name,
1994                 .value = value,
1995                 .value_len = value_len,
1996         };
1997
1998         struct ocfs2_xattr_search xis = {
1999                 .not_found = -ENODATA,
2000         };
2001
2002         struct ocfs2_xattr_search xbs = {
2003                 .not_found = -ENODATA,
2004         };
2005
2006         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2007                 return -EOPNOTSUPP;
2008
2009         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2010         if (ret < 0) {
2011                 mlog_errno(ret);
2012                 return ret;
2013         }
2014         xis.inode_bh = xbs.inode_bh = di_bh;
2015         di = (struct ocfs2_dinode *)di_bh->b_data;
2016
2017         down_write(&OCFS2_I(inode)->ip_xattr_sem);
2018         /*
2019          * Scan inode and external block to find the same name
2020          * extended attribute and collect search infomation.
2021          */
2022         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2023         if (ret)
2024                 goto cleanup;
2025         if (xis.not_found) {
2026                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2027                 if (ret)
2028                         goto cleanup;
2029         }
2030
2031         if (xis.not_found && xbs.not_found) {
2032                 ret = -ENODATA;
2033                 if (flags & XATTR_REPLACE)
2034                         goto cleanup;
2035                 ret = 0;
2036                 if (!value)
2037                         goto cleanup;
2038         } else {
2039                 ret = -EEXIST;
2040                 if (flags & XATTR_CREATE)
2041                         goto cleanup;
2042         }
2043
2044         if (!value) {
2045                 /* Remove existing extended attribute */
2046                 if (!xis.not_found)
2047                         ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2048                 else if (!xbs.not_found)
2049                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2050         } else {
2051                 /* We always try to set extended attribute into inode first*/
2052                 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2053                 if (!ret && !xbs.not_found) {
2054                         /*
2055                          * If succeed and that extended attribute existing in
2056                          * external block, then we will remove it.
2057                          */
2058                         xi.value = NULL;
2059                         xi.value_len = 0;
2060                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2061                 } else if (ret == -ENOSPC) {
2062                         if (di->i_xattr_loc && !xbs.xattr_bh) {
2063                                 ret = ocfs2_xattr_block_find(inode, name_index,
2064                                                              name, &xbs);
2065                                 if (ret)
2066                                         goto cleanup;
2067                         }
2068                         /*
2069                          * If no space in inode, we will set extended attribute
2070                          * into external block.
2071                          */
2072                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2073                         if (ret)
2074                                 goto cleanup;
2075                         if (!xis.not_found) {
2076                                 /*
2077                                  * If succeed and that extended attribute
2078                                  * existing in inode, we will remove it.
2079                                  */
2080                                 xi.value = NULL;
2081                                 xi.value_len = 0;
2082                                 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2083                         }
2084                 }
2085         }
2086 cleanup:
2087         up_write(&OCFS2_I(inode)->ip_xattr_sem);
2088         ocfs2_inode_unlock(inode, 1);
2089         brelse(di_bh);
2090         brelse(xbs.xattr_bh);
2091         for (i = 0; i < blk_per_bucket; i++)
2092                 brelse(xbs.bucket.bhs[i]);
2093
2094         return ret;
2095 }
2096
2097 /*
2098  * Find the xattr extent rec which may contains name_hash.
2099  * e_cpos will be the first name hash of the xattr rec.
2100  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2101  */
2102 static int ocfs2_xattr_get_rec(struct inode *inode,
2103                                u32 name_hash,
2104                                u64 *p_blkno,
2105                                u32 *e_cpos,
2106                                u32 *num_clusters,
2107                                struct ocfs2_extent_list *el)
2108 {
2109         int ret = 0, i;
2110         struct buffer_head *eb_bh = NULL;
2111         struct ocfs2_extent_block *eb;
2112         struct ocfs2_extent_rec *rec = NULL;
2113         u64 e_blkno = 0;
2114
2115         if (el->l_tree_depth) {
2116                 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2117                 if (ret) {
2118                         mlog_errno(ret);
2119                         goto out;
2120                 }
2121
2122                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2123                 el = &eb->h_list;
2124
2125                 if (el->l_tree_depth) {
2126                         ocfs2_error(inode->i_sb,
2127                                     "Inode %lu has non zero tree depth in "
2128                                     "xattr tree block %llu\n", inode->i_ino,
2129                                     (unsigned long long)eb_bh->b_blocknr);
2130                         ret = -EROFS;
2131                         goto out;
2132                 }
2133         }
2134
2135         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2136                 rec = &el->l_recs[i];
2137
2138                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2139                         e_blkno = le64_to_cpu(rec->e_blkno);
2140                         break;
2141                 }
2142         }
2143
2144         if (!e_blkno) {
2145                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2146                             "record (%u, %u, 0) in xattr", inode->i_ino,
2147                             le32_to_cpu(rec->e_cpos),
2148                             ocfs2_rec_clusters(el, rec));
2149                 ret = -EROFS;
2150                 goto out;
2151         }
2152
2153         *p_blkno = le64_to_cpu(rec->e_blkno);
2154         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2155         if (e_cpos)
2156                 *e_cpos = le32_to_cpu(rec->e_cpos);
2157 out:
2158         brelse(eb_bh);
2159         return ret;
2160 }
2161
2162 typedef int (xattr_bucket_func)(struct inode *inode,
2163                                 struct ocfs2_xattr_bucket *bucket,
2164                                 void *para);
2165
2166 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2167                                    struct buffer_head *header_bh,
2168                                    int name_index,
2169                                    const char *name,
2170                                    u32 name_hash,
2171                                    u16 *xe_index,
2172                                    int *found)
2173 {
2174         int i, ret = 0, cmp = 1, block_off, new_offset;
2175         struct ocfs2_xattr_header *xh =
2176                         (struct ocfs2_xattr_header *)header_bh->b_data;
2177         size_t name_len = strlen(name);
2178         struct ocfs2_xattr_entry *xe = NULL;
2179         struct buffer_head *name_bh = NULL;
2180         char *xe_name;
2181
2182         /*
2183          * We don't use binary search in the bucket because there
2184          * may be multiple entries with the same name hash.
2185          */
2186         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2187                 xe = &xh->xh_entries[i];
2188
2189                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2190                         continue;
2191                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2192                         break;
2193
2194                 cmp = name_index - ocfs2_xattr_get_type(xe);
2195                 if (!cmp)
2196                         cmp = name_len - xe->xe_name_len;
2197                 if (cmp)
2198                         continue;
2199
2200                 ret = ocfs2_xattr_bucket_get_name_value(inode,
2201                                                         xh,
2202                                                         i,
2203                                                         &block_off,
2204                                                         &new_offset);
2205                 if (ret) {
2206                         mlog_errno(ret);
2207                         break;
2208                 }
2209
2210                 ret = ocfs2_read_block(inode, header_bh->b_blocknr + block_off,
2211                                        &name_bh);
2212                 if (ret) {
2213                         mlog_errno(ret);
2214                         break;
2215                 }
2216                 xe_name = name_bh->b_data + new_offset;
2217
2218                 cmp = memcmp(name, xe_name, name_len);
2219                 brelse(name_bh);
2220                 name_bh = NULL;
2221
2222                 if (cmp == 0) {
2223                         *xe_index = i;
2224                         *found = 1;
2225                         ret = 0;
2226                         break;
2227                 }
2228         }
2229
2230         return ret;
2231 }
2232
2233 /*
2234  * Find the specified xattr entry in a series of buckets.
2235  * This series start from p_blkno and last for num_clusters.
2236  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2237  * the num of the valid buckets.
2238  *
2239  * Return the buffer_head this xattr should reside in. And if the xattr's
2240  * hash is in the gap of 2 buckets, return the lower bucket.
2241  */
2242 static int ocfs2_xattr_bucket_find(struct inode *inode,
2243                                    int name_index,
2244                                    const char *name,
2245                                    u32 name_hash,
2246                                    u64 p_blkno,
2247                                    u32 first_hash,
2248                                    u32 num_clusters,
2249                                    struct ocfs2_xattr_search *xs)
2250 {
2251         int ret, found = 0;
2252         struct buffer_head *bh = NULL;
2253         struct buffer_head *lower_bh = NULL;
2254         struct ocfs2_xattr_header *xh = NULL;
2255         struct ocfs2_xattr_entry *xe = NULL;
2256         u16 index = 0;
2257         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2258         int low_bucket = 0, bucket, high_bucket;
2259         u32 last_hash;
2260         u64 blkno;
2261
2262         ret = ocfs2_read_block(inode, p_blkno, &bh);
2263         if (ret) {
2264                 mlog_errno(ret);
2265                 goto out;
2266         }
2267
2268         xh = (struct ocfs2_xattr_header *)bh->b_data;
2269         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2270
2271         while (low_bucket <= high_bucket) {
2272                 brelse(bh);
2273                 bh = NULL;
2274                 bucket = (low_bucket + high_bucket) / 2;
2275
2276                 blkno = p_blkno + bucket * blk_per_bucket;
2277
2278                 ret = ocfs2_read_block(inode, blkno, &bh);
2279                 if (ret) {
2280                         mlog_errno(ret);
2281                         goto out;
2282                 }
2283
2284                 xh = (struct ocfs2_xattr_header *)bh->b_data;
2285                 xe = &xh->xh_entries[0];
2286                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
2287                         high_bucket = bucket - 1;
2288                         continue;
2289                 }
2290
2291                 /*
2292                  * Check whether the hash of the last entry in our
2293                  * bucket is larger than the search one. for an empty
2294                  * bucket, the last one is also the first one.
2295                  */
2296                 if (xh->xh_count)
2297                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
2298
2299                 last_hash = le32_to_cpu(xe->xe_name_hash);
2300
2301                 /* record lower_bh which may be the insert place. */
2302                 brelse(lower_bh);
2303                 lower_bh = bh;
2304                 bh = NULL;
2305
2306                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
2307                         low_bucket = bucket + 1;
2308                         continue;
2309                 }
2310
2311                 /* the searched xattr should reside in this bucket if exists. */
2312                 ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
2313                                               name_index, name, name_hash,
2314                                               &index, &found);
2315                 if (ret) {
2316                         mlog_errno(ret);
2317                         goto out;
2318                 }
2319                 break;
2320         }
2321
2322         /*
2323          * Record the bucket we have found.
2324          * When the xattr's hash value is in the gap of 2 buckets, we will
2325          * always set it to the previous bucket.
2326          */
2327         if (!lower_bh) {
2328                 /*
2329                  * We can't find any bucket whose first name_hash is less
2330                  * than the find name_hash.
2331                  */
2332                 BUG_ON(bh->b_blocknr != p_blkno);
2333                 lower_bh = bh;
2334                 bh = NULL;
2335         }
2336         xs->bucket.bhs[0] = lower_bh;
2337         xs->bucket.xh = (struct ocfs2_xattr_header *)
2338                                         xs->bucket.bhs[0]->b_data;
2339         lower_bh = NULL;
2340
2341         xs->header = xs->bucket.xh;
2342         xs->base = xs->bucket.bhs[0]->b_data;
2343         xs->end = xs->base + inode->i_sb->s_blocksize;
2344
2345         if (found) {
2346                 /*
2347                  * If we have found the xattr enty, read all the blocks in
2348                  * this bucket.
2349                  */
2350                 ret = ocfs2_read_blocks(inode, xs->bucket.bhs[0]->b_blocknr + 1,
2351                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
2352                                         OCFS2_BH_CACHED);
2353                 if (ret) {
2354                         mlog_errno(ret);
2355                         goto out;
2356                 }
2357
2358                 xs->here = &xs->header->xh_entries[index];
2359                 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
2360                      (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
2361         } else
2362                 ret = -ENODATA;
2363
2364 out:
2365         brelse(bh);
2366         brelse(lower_bh);
2367         return ret;
2368 }
2369
2370 static int ocfs2_xattr_index_block_find(struct inode *inode,
2371                                         struct buffer_head *root_bh,
2372                                         int name_index,
2373                                         const char *name,
2374                                         struct ocfs2_xattr_search *xs)
2375 {
2376         int ret;
2377         struct ocfs2_xattr_block *xb =
2378                         (struct ocfs2_xattr_block *)root_bh->b_data;
2379         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
2380         struct ocfs2_extent_list *el = &xb_root->xt_list;
2381         u64 p_blkno = 0;
2382         u32 first_hash, num_clusters = 0;
2383         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
2384
2385         if (le16_to_cpu(el->l_next_free_rec) == 0)
2386                 return -ENODATA;
2387
2388         mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
2389              name, name_hash, name_index);
2390
2391         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
2392                                   &num_clusters, el);
2393         if (ret) {
2394                 mlog_errno(ret);
2395                 goto out;
2396         }
2397
2398         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
2399
2400         mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
2401              "in the rec is %u\n", num_clusters, p_blkno, first_hash);
2402
2403         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
2404                                       p_blkno, first_hash, num_clusters, xs);
2405
2406 out:
2407         return ret;
2408 }
2409
2410 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
2411                                        u64 blkno,
2412                                        u32 clusters,
2413                                        xattr_bucket_func *func,
2414                                        void *para)
2415 {
2416         int i, j, ret = 0;
2417         int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2418         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
2419         u32 num_buckets = clusters * bpc;
2420         struct ocfs2_xattr_bucket bucket;
2421
2422         memset(&bucket, 0, sizeof(bucket));
2423
2424         mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
2425              clusters, blkno);
2426
2427         for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
2428                 ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket,
2429                                         bucket.bhs, OCFS2_BH_CACHED);
2430                 if (ret) {
2431                         mlog_errno(ret);
2432                         goto out;
2433                 }
2434
2435                 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
2436                 /*
2437                  * The real bucket num in this series of blocks is stored
2438                  * in the 1st bucket.
2439                  */
2440                 if (i == 0)
2441                         num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
2442
2443                 mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno,
2444                      le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash));
2445                 if (func) {
2446                         ret = func(inode, &bucket, para);
2447                         if (ret) {
2448                                 mlog_errno(ret);
2449                                 break;
2450                         }
2451                 }
2452
2453                 for (j = 0; j < blk_per_bucket; j++)
2454                         brelse(bucket.bhs[j]);
2455                 memset(&bucket, 0, sizeof(bucket));
2456         }
2457
2458 out:
2459         for (j = 0; j < blk_per_bucket; j++)
2460                 brelse(bucket.bhs[j]);
2461
2462         return ret;
2463 }
2464
2465 struct ocfs2_xattr_tree_list {
2466         char *buffer;
2467         size_t buffer_size;
2468         size_t result;
2469 };
2470
2471 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
2472                                              struct ocfs2_xattr_header *xh,
2473                                              int index,
2474                                              int *block_off,
2475                                              int *new_offset)
2476 {
2477         u16 name_offset;
2478
2479         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
2480                 return -EINVAL;
2481
2482         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
2483
2484         *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
2485         *new_offset = name_offset % inode->i_sb->s_blocksize;
2486
2487         return 0;
2488 }
2489
2490 static int ocfs2_list_xattr_bucket(struct inode *inode,
2491                                    struct ocfs2_xattr_bucket *bucket,
2492                                    void *para)
2493 {
2494         int ret = 0, type;
2495         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
2496         int i, block_off, new_offset;
2497         const char *prefix, *name;
2498
2499         for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
2500                 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
2501                 type = ocfs2_xattr_get_type(entry);
2502                 prefix = ocfs2_xattr_prefix(type);
2503
2504                 if (prefix) {
2505                         ret = ocfs2_xattr_bucket_get_name_value(inode,
2506                                                                 bucket->xh,
2507                                                                 i,
2508                                                                 &block_off,
2509                                                                 &new_offset);
2510                         if (ret)
2511                                 break;
2512
2513                         name = (const char *)bucket->bhs[block_off]->b_data +
2514                                 new_offset;
2515                         ret = ocfs2_xattr_list_entry(xl->buffer,
2516                                                      xl->buffer_size,
2517                                                      &xl->result,
2518                                                      prefix, name,
2519                                                      entry->xe_name_len);
2520                         if (ret)
2521                                 break;
2522                 }
2523         }
2524
2525         return ret;
2526 }
2527
2528 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
2529                                              struct ocfs2_xattr_tree_root *xt,
2530                                              char *buffer,
2531                                              size_t buffer_size)
2532 {
2533         struct ocfs2_extent_list *el = &xt->xt_list;
2534         int ret = 0;
2535         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
2536         u64 p_blkno = 0;
2537         struct ocfs2_xattr_tree_list xl = {
2538                 .buffer = buffer,
2539                 .buffer_size = buffer_size,
2540                 .result = 0,
2541         };
2542
2543         if (le16_to_cpu(el->l_next_free_rec) == 0)
2544                 return 0;
2545
2546         while (name_hash > 0) {
2547                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
2548                                           &e_cpos, &num_clusters, el);
2549                 if (ret) {
2550                         mlog_errno(ret);
2551                         goto out;
2552                 }
2553
2554                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
2555                                                   ocfs2_list_xattr_bucket,
2556                                                   &xl);
2557                 if (ret) {
2558                         mlog_errno(ret);
2559                         goto out;
2560                 }
2561
2562                 if (e_cpos == 0)
2563                         break;
2564
2565                 name_hash = e_cpos - 1;
2566         }
2567
2568         ret = xl.result;
2569 out:
2570         return ret;
2571 }
2572
2573 static int cmp_xe(const void *a, const void *b)
2574 {
2575         const struct ocfs2_xattr_entry *l = a, *r = b;
2576         u32 l_hash = le32_to_cpu(l->xe_name_hash);
2577         u32 r_hash = le32_to_cpu(r->xe_name_hash);
2578
2579         if (l_hash > r_hash)
2580                 return 1;
2581         if (l_hash < r_hash)
2582                 return -1;
2583         return 0;
2584 }
2585
2586 static void swap_xe(void *a, void *b, int size)
2587 {
2588         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
2589
2590         tmp = *l;
2591         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
2592         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
2593 }
2594
2595 /*
2596  * When the ocfs2_xattr_block is filled up, new bucket will be created
2597  * and all the xattr entries will be moved to the new bucket.
2598  * Note: we need to sort the entries since they are not saved in order
2599  * in the ocfs2_xattr_block.
2600  */
2601 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
2602                                            struct buffer_head *xb_bh,
2603                                            struct buffer_head *xh_bh,
2604                                            struct buffer_head *data_bh)
2605 {
2606         int i, blocksize = inode->i_sb->s_blocksize;
2607         u16 offset, size, off_change;
2608         struct ocfs2_xattr_entry *xe;
2609         struct ocfs2_xattr_block *xb =
2610                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
2611         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
2612         struct ocfs2_xattr_header *xh =
2613                                 (struct ocfs2_xattr_header *)xh_bh->b_data;
2614         u16 count = le16_to_cpu(xb_xh->xh_count);
2615         char *target = xh_bh->b_data, *src = xb_bh->b_data;
2616
2617         mlog(0, "cp xattr from block %llu to bucket %llu\n",
2618              (unsigned long long)xb_bh->b_blocknr,
2619              (unsigned long long)xh_bh->b_blocknr);
2620
2621         memset(xh_bh->b_data, 0, blocksize);
2622         if (data_bh)
2623                 memset(data_bh->b_data, 0, blocksize);
2624         /*
2625          * Since the xe_name_offset is based on ocfs2_xattr_header,
2626          * there is a offset change corresponding to the change of
2627          * ocfs2_xattr_header's position.
2628          */
2629         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2630         xe = &xb_xh->xh_entries[count - 1];
2631         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
2632         size = blocksize - offset;
2633
2634         /* copy all the names and values. */
2635         if (data_bh)
2636                 target = data_bh->b_data;
2637         memcpy(target + offset, src + offset, size);
2638
2639         /* Init new header now. */
2640         xh->xh_count = xb_xh->xh_count;
2641         xh->xh_num_buckets = cpu_to_le16(1);
2642         xh->xh_name_value_len = cpu_to_le16(size);
2643         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
2644
2645         /* copy all the entries. */
2646         target = xh_bh->b_data;
2647         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
2648         size = count * sizeof(struct ocfs2_xattr_entry);
2649         memcpy(target + offset, (char *)xb_xh + offset, size);
2650
2651         /* Change the xe offset for all the xe because of the move. */
2652         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
2653                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2654         for (i = 0; i < count; i++)
2655                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
2656
2657         mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
2658              offset, size, off_change);
2659
2660         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
2661              cmp_xe, swap_xe);
2662 }
2663
2664 /*
2665  * After we move xattr from block to index btree, we have to
2666  * update ocfs2_xattr_search to the new xe and base.
2667  *
2668  * When the entry is in xattr block, xattr_bh indicates the storage place.
2669  * While if the entry is in index b-tree, "bucket" indicates the
2670  * real place of the xattr.
2671  */
2672 static int ocfs2_xattr_update_xattr_search(struct inode *inode,
2673                                            struct ocfs2_xattr_search *xs,
2674                                            struct buffer_head *old_bh,
2675                                            struct buffer_head *new_bh)
2676 {
2677         int ret = 0;
2678         char *buf = old_bh->b_data;
2679         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
2680         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
2681         int i, blocksize = inode->i_sb->s_blocksize;
2682         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2683
2684         xs->bucket.bhs[0] = new_bh;
2685         get_bh(new_bh);
2686         xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
2687         xs->header = xs->bucket.xh;
2688
2689         xs->base = new_bh->b_data;
2690         xs->end = xs->base + inode->i_sb->s_blocksize;
2691
2692         if (!xs->not_found) {
2693                 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
2694                         ret = ocfs2_read_blocks(inode,
2695                                         xs->bucket.bhs[0]->b_blocknr + 1,
2696                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
2697                                         OCFS2_BH_CACHED);
2698                         if (ret) {
2699                                 mlog_errno(ret);
2700                                 return ret;
2701                         }
2702
2703                         i = xs->here - old_xh->xh_entries;
2704                         xs->here = &xs->header->xh_entries[i];
2705                 }
2706         }
2707
2708         return ret;
2709 }
2710
2711 static int ocfs2_xattr_create_index_block(struct inode *inode,
2712                                           struct ocfs2_xattr_search *xs)
2713 {
2714         int ret, credits = OCFS2_SUBALLOC_ALLOC;
2715         u32 bit_off, len;
2716         u64 blkno;
2717         handle_t *handle;
2718         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2719         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2720         struct ocfs2_alloc_context *data_ac;
2721         struct buffer_head *xh_bh = NULL, *data_bh = NULL;
2722         struct buffer_head *xb_bh = xs->xattr_bh;
2723         struct ocfs2_xattr_block *xb =
2724                         (struct ocfs2_xattr_block *)xb_bh->b_data;
2725         struct ocfs2_xattr_tree_root *xr;
2726         u16 xb_flags = le16_to_cpu(xb->xb_flags);
2727         u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2728
2729         mlog(0, "create xattr index block for %llu\n",
2730              (unsigned long long)xb_bh->b_blocknr);
2731
2732         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
2733
2734         ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
2735         if (ret) {
2736                 mlog_errno(ret);
2737                 goto out;
2738         }
2739
2740         /*
2741          * XXX:
2742          * We can use this lock for now, and maybe move to a dedicated mutex
2743          * if performance becomes a problem later.
2744          */
2745         down_write(&oi->ip_alloc_sem);
2746
2747         /*
2748          * 3 more credits, one for xattr block update, one for the 1st block
2749          * of the new xattr bucket and one for the value/data.
2750          */
2751         credits += 3;
2752         handle = ocfs2_start_trans(osb, credits);
2753         if (IS_ERR(handle)) {
2754                 ret = PTR_ERR(handle);
2755                 mlog_errno(ret);
2756                 goto out_sem;
2757         }
2758
2759         ret = ocfs2_journal_access(handle, inode, xb_bh,
2760                                    OCFS2_JOURNAL_ACCESS_WRITE);
2761         if (ret) {
2762                 mlog_errno(ret);
2763                 goto out_commit;
2764         }
2765
2766         ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
2767         if (ret) {
2768                 mlog_errno(ret);
2769                 goto out_commit;
2770         }
2771
2772         /*
2773          * The bucket may spread in many blocks, and
2774          * we will only touch the 1st block and the last block
2775          * in the whole bucket(one for entry and one for data).
2776          */
2777         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
2778
2779         mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
2780
2781         xh_bh = sb_getblk(inode->i_sb, blkno);
2782         if (!xh_bh) {
2783                 ret = -EIO;
2784                 mlog_errno(ret);
2785                 goto out_commit;
2786         }
2787
2788         ocfs2_set_new_buffer_uptodate(inode, xh_bh);
2789
2790         ret = ocfs2_journal_access(handle, inode, xh_bh,
2791                                    OCFS2_JOURNAL_ACCESS_CREATE);
2792         if (ret) {
2793                 mlog_errno(ret);
2794                 goto out_commit;
2795         }
2796
2797         if (bpb > 1) {
2798                 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
2799                 if (!data_bh) {
2800                         ret = -EIO;
2801                         mlog_errno(ret);
2802                         goto out_commit;
2803                 }
2804
2805                 ocfs2_set_new_buffer_uptodate(inode, data_bh);
2806
2807                 ret = ocfs2_journal_access(handle, inode, data_bh,
2808                                            OCFS2_JOURNAL_ACCESS_CREATE);
2809                 if (ret) {
2810                         mlog_errno(ret);
2811                         goto out_commit;
2812                 }
2813         }
2814
2815         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
2816
2817         ocfs2_journal_dirty(handle, xh_bh);
2818         if (data_bh)
2819                 ocfs2_journal_dirty(handle, data_bh);
2820
2821         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
2822
2823         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
2824         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
2825                offsetof(struct ocfs2_xattr_block, xb_attrs));
2826
2827         xr = &xb->xb_attrs.xb_root;
2828         xr->xt_clusters = cpu_to_le32(1);
2829         xr->xt_last_eb_blk = 0;
2830         xr->xt_list.l_tree_depth = 0;
2831         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
2832         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2833
2834         xr->xt_list.l_recs[0].e_cpos = 0;
2835         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
2836         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
2837
2838         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
2839
2840         ret = ocfs2_journal_dirty(handle, xb_bh);
2841         if (ret) {
2842                 mlog_errno(ret);
2843                 goto out_commit;
2844         }
2845
2846 out_commit:
2847         ocfs2_commit_trans(osb, handle);
2848
2849 out_sem:
2850         up_write(&oi->ip_alloc_sem);
2851
2852 out:
2853         if (data_ac)
2854                 ocfs2_free_alloc_context(data_ac);
2855
2856         brelse(xh_bh);
2857         brelse(data_bh);
2858
2859         return ret;
2860 }
2861
2862 static int cmp_xe_offset(const void *a, const void *b)
2863 {
2864         const struct ocfs2_xattr_entry *l = a, *r = b;
2865         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
2866         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
2867
2868         if (l_name_offset < r_name_offset)
2869                 return 1;
2870         if (l_name_offset > r_name_offset)
2871                 return -1;
2872         return 0;
2873 }
2874
2875 /*
2876  * defrag a xattr bucket if we find that the bucket has some
2877  * holes beteen name/value pairs.
2878  * We will move all the name/value pairs to the end of the bucket
2879  * so that we can spare some space for insertion.
2880  */
2881 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
2882                                      struct ocfs2_xattr_bucket *bucket)
2883 {
2884         int ret, i;
2885         size_t end, offset, len, value_len;
2886         struct ocfs2_xattr_header *xh;
2887         char *entries, *buf, *bucket_buf = NULL;
2888         u64 blkno = bucket->bhs[0]->b_blocknr;
2889         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2890         u16 xh_free_start;
2891         size_t blocksize = inode->i_sb->s_blocksize;
2892         handle_t *handle;
2893         struct buffer_head **bhs;
2894         struct ocfs2_xattr_entry *xe;
2895
2896         bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
2897                         GFP_NOFS);
2898         if (!bhs)
2899                 return -ENOMEM;
2900
2901         ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket, bhs,
2902                                 OCFS2_BH_CACHED);
2903         if (ret)
2904                 goto out;
2905
2906         /*
2907          * In order to make the operation more efficient and generic,
2908          * we copy all the blocks into a contiguous memory and do the
2909          * defragment there, so if anything is error, we will not touch
2910          * the real block.
2911          */
2912         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
2913         if (!bucket_buf) {
2914                 ret = -EIO;
2915                 goto out;
2916         }
2917
2918         buf = bucket_buf;
2919         for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
2920                 memcpy(buf, bhs[i]->b_data, blocksize);
2921
2922         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
2923         if (IS_ERR(handle)) {
2924                 ret = PTR_ERR(handle);
2925                 handle = NULL;
2926                 mlog_errno(ret);
2927                 goto out;
2928         }
2929
2930         for (i = 0; i < blk_per_bucket; i++) {
2931                 ret = ocfs2_journal_access(handle, inode, bhs[i],
2932                                            OCFS2_JOURNAL_ACCESS_WRITE);
2933                 if (ret < 0) {
2934                         mlog_errno(ret);
2935                         goto commit;
2936                 }
2937         }
2938
2939         xh = (struct ocfs2_xattr_header *)bucket_buf;
2940         entries = (char *)xh->xh_entries;
2941         xh_free_start = le16_to_cpu(xh->xh_free_start);
2942
2943         mlog(0, "adjust xattr bucket in %llu, count = %u, "
2944              "xh_free_start = %u, xh_name_value_len = %u.\n",
2945              blkno, le16_to_cpu(xh->xh_count), xh_free_start,
2946              le16_to_cpu(xh->xh_name_value_len));
2947
2948         /*
2949          * sort all the entries by their offset.
2950          * the largest will be the first, so that we can
2951          * move them to the end one by one.
2952          */
2953         sort(entries, le16_to_cpu(xh->xh_count),
2954              sizeof(struct ocfs2_xattr_entry),
2955              cmp_xe_offset, swap_xe);
2956
2957         /* Move all name/values to the end of the bucket. */
2958         xe = xh->xh_entries;
2959         end = OCFS2_XATTR_BUCKET_SIZE;
2960         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
2961                 offset = le16_to_cpu(xe->xe_name_offset);
2962                 if (ocfs2_xattr_is_local(xe))
2963                         value_len = OCFS2_XATTR_SIZE(
2964                                         le64_to_cpu(xe->xe_value_size));
2965                 else
2966                         value_len = OCFS2_XATTR_ROOT_SIZE;
2967                 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
2968
2969                 /*
2970                  * We must make sure that the name/value pair
2971                  * exist in the same block. So adjust end to
2972                  * the previous block end if needed.
2973                  */
2974                 if (((end - len) / blocksize !=
2975                         (end - 1) / blocksize))
2976                         end = end - end % blocksize;
2977
2978                 if (end > offset + len) {
2979                         memmove(bucket_buf + end - len,
2980                                 bucket_buf + offset, len);
2981                         xe->xe_name_offset = cpu_to_le16(end - len);
2982                 }
2983
2984                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
2985                                 "bucket %llu\n", (unsigned long long)blkno);
2986
2987                 end -= len;
2988         }
2989
2990         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
2991                         "bucket %llu\n", (unsigned long long)blkno);
2992
2993         if (xh_free_start == end)
2994                 goto commit;
2995
2996         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
2997         xh->xh_free_start = cpu_to_le16(end);
2998
2999         /* sort the entries by their name_hash. */
3000         sort(entries, le16_to_cpu(xh->xh_count),
3001              sizeof(struct ocfs2_xattr_entry),
3002              cmp_xe, swap_xe);
3003
3004         buf = bucket_buf;
3005         for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
3006                 memcpy(bhs[i]->b_data, buf, blocksize);
3007                 ocfs2_journal_dirty(handle, bhs[i]);
3008         }
3009
3010 commit:
3011         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3012 out:
3013
3014         if (bhs) {
3015                 for (i = 0; i < blk_per_bucket; i++)
3016                         brelse(bhs[i]);
3017         }
3018         kfree(bhs);
3019
3020         kfree(bucket_buf);
3021         return ret;
3022 }
3023
3024 /*
3025  * Move half nums of the xattr bucket in the previous cluster to this new
3026  * cluster. We only touch the last cluster of the previous extend record.
3027  *
3028  * first_bh is the first buffer_head of a series of bucket in the same
3029  * extent rec and header_bh is the header of one bucket in this cluster.
3030  * They will be updated if we move the data header_bh contains to the new
3031  * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
3032  */
3033 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3034                                                handle_t *handle,
3035                                                struct buffer_head **first_bh,
3036                                                struct buffer_head **header_bh,
3037                                                u64 new_blkno,
3038                                                u64 prev_blkno,
3039                                                u32 num_clusters,
3040                                                u32 *first_hash)
3041 {
3042         int i, ret, credits;
3043         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3044         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3045         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3046         int blocksize = inode->i_sb->s_blocksize;
3047         struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
3048         struct ocfs2_xattr_header *new_xh;
3049         struct ocfs2_xattr_header *xh =
3050                         (struct ocfs2_xattr_header *)((*first_bh)->b_data);
3051
3052         BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
3053         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
3054
3055         prev_bh = *first_bh;
3056         get_bh(prev_bh);
3057         xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
3058
3059         prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
3060
3061         mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3062              prev_blkno, new_blkno);
3063
3064         /*
3065          * We need to update the 1st half of the new cluster and
3066          * 1 more for the update of the 1st bucket of the previous
3067          * extent record.
3068          */
3069         credits = bpc / 2 + 1;
3070         ret = ocfs2_extend_trans(handle, credits);
3071         if (ret) {
3072                 mlog_errno(ret);
3073                 goto out;
3074         }
3075
3076         ret = ocfs2_journal_access(handle, inode, prev_bh,
3077                                    OCFS2_JOURNAL_ACCESS_WRITE);
3078         if (ret) {
3079                 mlog_errno(ret);
3080                 goto out;
3081         }
3082
3083         for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
3084                 old_bh = new_bh = NULL;
3085                 new_bh = sb_getblk(inode->i_sb, new_blkno);
3086                 if (!new_bh) {
3087                         ret = -EIO;
3088                         mlog_errno(ret);
3089                         goto out;
3090                 }
3091
3092                 ocfs2_set_new_buffer_uptodate(inode, new_bh);
3093
3094                 ret = ocfs2_journal_access(handle, inode, new_bh,
3095                                            OCFS2_JOURNAL_ACCESS_CREATE);
3096                 if (ret < 0) {
3097                         mlog_errno(ret);
3098                         brelse(new_bh);
3099                         goto out;
3100                 }
3101
3102                 ret = ocfs2_read_block(inode, prev_blkno, &old_bh);
3103                 if (ret < 0) {
3104                         mlog_errno(ret);
3105                         brelse(new_bh);
3106                         goto out;
3107                 }
3108
3109                 memcpy(new_bh->b_data, old_bh->b_data, blocksize);
3110
3111                 if (i == 0) {
3112                         new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
3113                         new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
3114
3115                         if (first_hash)
3116                                 *first_hash = le32_to_cpu(
3117                                         new_xh->xh_entries[0].xe_name_hash);
3118                         new_first_bh = new_bh;
3119                         get_bh(new_first_bh);
3120                 }
3121
3122                 ocfs2_journal_dirty(handle, new_bh);
3123
3124                 if (*header_bh == old_bh) {
3125                         brelse(*header_bh);
3126                         *header_bh = new_bh;
3127                         get_bh(*header_bh);
3128
3129                         brelse(*first_bh);
3130                         *first_bh = new_first_bh;
3131                         get_bh(*first_bh);
3132                 }
3133                 brelse(new_bh);
3134                 brelse(old_bh);
3135         }
3136
3137         le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
3138
3139         ocfs2_journal_dirty(handle, prev_bh);
3140 out:
3141         brelse(prev_bh);
3142         brelse(new_first_bh);
3143         return ret;
3144 }
3145
3146 static int ocfs2_read_xattr_bucket(struct inode *inode,
3147                                    u64 blkno,
3148                                    struct buffer_head **bhs,
3149                                    int new)
3150 {
3151         int ret = 0;
3152         u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3153
3154         if (!new)
3155                 return ocfs2_read_blocks(inode, blkno,
3156                                          blk_per_bucket, bhs,
3157                                          OCFS2_BH_CACHED);
3158
3159         for (i = 0; i < blk_per_bucket; i++) {
3160                 bhs[i] = sb_getblk(inode->i_sb, blkno + i);
3161                 if (bhs[i] == NULL) {
3162                         ret = -EIO;
3163                         mlog_errno(ret);
3164                         break;
3165                 }
3166                 ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
3167         }
3168
3169         return ret;
3170 }
3171
3172 /*
3173  * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
3174  * first_hash will record the 1st hash of the new bucket.
3175  */
3176 static int ocfs2_half_xattr_bucket(struct inode *inode,
3177                                    handle_t *handle,
3178                                    u64 blk,
3179                                    u64 new_blk,
3180                                    u32 *first_hash,
3181                                    int new_bucket_head)
3182 {
3183         int ret, i;
3184         u16 count, start, len, name_value_len, xe_len, name_offset;
3185         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3186         struct buffer_head **s_bhs, **t_bhs = NULL;
3187         struct ocfs2_xattr_header *xh;
3188         struct ocfs2_xattr_entry *xe;
3189         int blocksize = inode->i_sb->s_blocksize;
3190
3191         mlog(0, "move half of xattrs from bucket %llu to %llu\n",
3192              blk, new_blk);
3193
3194         s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3195         if (!s_bhs)
3196                 return -ENOMEM;
3197
3198         ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
3199         if (ret) {
3200                 mlog_errno(ret);
3201                 goto out;
3202         }
3203
3204         ret = ocfs2_journal_access(handle, inode, s_bhs[0],
3205                                    OCFS2_JOURNAL_ACCESS_WRITE);
3206         if (ret) {
3207                 mlog_errno(ret);
3208                 goto out;
3209         }
3210
3211         t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3212         if (!t_bhs) {
3213                 ret = -ENOMEM;
3214                 goto out;
3215         }
3216
3217         ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
3218         if (ret) {
3219                 mlog_errno(ret);
3220                 goto out;
3221         }
3222
3223         for (i = 0; i < blk_per_bucket; i++) {
3224                 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3225                                            OCFS2_JOURNAL_ACCESS_CREATE);
3226                 if (ret) {
3227                         mlog_errno(ret);
3228                         goto out;
3229                 }
3230         }
3231
3232         /* copy the whole bucket to the new first. */
3233         for (i = 0; i < blk_per_bucket; i++)
3234                 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3235
3236         /* update the new bucket. */
3237         xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
3238         count = le16_to_cpu(xh->xh_count);
3239         start = count / 2;
3240
3241         /*
3242          * Calculate the total name/value len and xh_free_start for
3243          * the old bucket first.
3244          */
3245         name_offset = OCFS2_XATTR_BUCKET_SIZE;
3246         name_value_len = 0;
3247         for (i = 0; i < start; i++) {
3248                 xe = &xh->xh_entries[i];
3249                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3250                 if (ocfs2_xattr_is_local(xe))
3251                         xe_len +=
3252                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3253                 else
3254                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3255                 name_value_len += xe_len;
3256                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3257                         name_offset = le16_to_cpu(xe->xe_name_offset);
3258         }
3259
3260         /*
3261          * Now begin the modification to the new bucket.
3262          *
3263          * In the new bucket, We just move the xattr entry to the beginning
3264          * and don't touch the name/value. So there will be some holes in the
3265          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3266          * called.
3267          */
3268         xe = &xh->xh_entries[start];
3269         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3270         mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3271              (int)((char *)xe - (char *)xh),
3272              (int)((char *)xh->xh_entries - (char *)xh));
3273         memmove((char *)xh->xh_entries, (char *)xe, len);
3274         xe = &xh->xh_entries[count - start];
3275         len = sizeof(struct ocfs2_xattr_entry) * start;
3276         memset((char *)xe, 0, len);
3277
3278         le16_add_cpu(&xh->xh_count, -start);
3279         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3280
3281         /* Calculate xh_free_start for the new bucket. */
3282         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3283         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3284                 xe = &xh->xh_entries[i];
3285                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3286                 if (ocfs2_xattr_is_local(xe))
3287                         xe_len +=
3288                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3289                 else
3290                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3291                 if (le16_to_cpu(xe->xe_name_offset) <
3292                     le16_to_cpu(xh->xh_free_start))
3293                         xh->xh_free_start = xe->xe_name_offset;
3294         }
3295
3296         /* set xh->xh_num_buckets for the new xh. */
3297         if (new_bucket_head)
3298                 xh->xh_num_buckets = cpu_to_le16(1);
3299         else
3300                 xh->xh_num_buckets = 0;
3301
3302         for (i = 0; i < blk_per_bucket; i++) {
3303                 ocfs2_journal_dirty(handle, t_bhs[i]);
3304                 if (ret)
3305                         mlog_errno(ret);
3306         }
3307
3308         /* store the first_hash of the new bucket. */
3309         if (first_hash)
3310                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3311
3312         /*
3313          * Now only update the 1st block of the old bucket.
3314          * Please note that the entry has been sorted already above.
3315          */
3316         xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
3317         memset(&xh->xh_entries[start], 0,
3318                sizeof(struct ocfs2_xattr_entry) * (count - start));
3319         xh->xh_count = cpu_to_le16(start);
3320         xh->xh_free_start = cpu_to_le16(name_offset);
3321         xh->xh_name_value_len = cpu_to_le16(name_value_len);
3322
3323         ocfs2_journal_dirty(handle, s_bhs[0]);
3324         if (ret)
3325                 mlog_errno(ret);
3326
3327 out:
3328         if (s_bhs) {
3329                 for (i = 0; i < blk_per_bucket; i++)
3330                         brelse(s_bhs[i]);
3331         }
3332         kfree(s_bhs);
3333
3334         if (t_bhs) {
3335                 for (i = 0; i < blk_per_bucket; i++)
3336                         brelse(t_bhs[i]);
3337         }
3338         kfree(t_bhs);
3339
3340         return ret;
3341 }
3342
3343 /*
3344  * Copy xattr from one bucket to another bucket.
3345  *
3346  * The caller must make sure that the journal transaction
3347  * has enough space for journaling.
3348  */
3349 static int ocfs2_cp_xattr_bucket(struct inode *inode,
3350                                  handle_t *handle,
3351                                  u64 s_blkno,
3352                                  u64 t_blkno,
3353                                  int t_is_new)
3354 {
3355         int ret, i;
3356         int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3357         int blocksize = inode->i_sb->s_blocksize;
3358         struct buffer_head **s_bhs, **t_bhs = NULL;
3359
3360         BUG_ON(s_blkno == t_blkno);
3361
3362         mlog(0, "cp bucket %llu to %llu, target is %d\n",
3363              s_blkno, t_blkno, t_is_new);
3364
3365         s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3366                         GFP_NOFS);
3367         if (!s_bhs)
3368                 return -ENOMEM;
3369
3370         ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
3371         if (ret)
3372                 goto out;
3373
3374         t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3375                         GFP_NOFS);
3376         if (!t_bhs) {
3377                 ret = -ENOMEM;
3378                 goto out;
3379         }
3380
3381         ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
3382         if (ret)
3383                 goto out;
3384
3385         for (i = 0; i < blk_per_bucket; i++) {
3386                 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3387                                            OCFS2_JOURNAL_ACCESS_WRITE);
3388                 if (ret)
3389                         goto out;
3390         }
3391
3392         for (i = 0; i < blk_per_bucket; i++) {
3393                 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3394                 ocfs2_journal_dirty(handle, t_bhs[i]);
3395         }
3396
3397 out:
3398         if (s_bhs) {
3399                 for (i = 0; i < blk_per_bucket; i++)
3400                         brelse(s_bhs[i]);
3401         }
3402         kfree(s_bhs);
3403
3404         if (t_bhs) {
3405                 for (i = 0; i < blk_per_bucket; i++)
3406                         brelse(t_bhs[i]);
3407         }
3408         kfree(t_bhs);
3409
3410         return ret;
3411 }
3412
3413 /*
3414  * Copy one xattr cluster from src_blk to to_blk.
3415  * The to_blk will become the first bucket header of the cluster, so its
3416  * xh_num_buckets will be initialized as the bucket num in the cluster.
3417  */
3418 static int ocfs2_cp_xattr_cluster(struct inode *inode,
3419                                   handle_t *handle,
3420                                   struct buffer_head *first_bh,
3421                                   u64 src_blk,
3422                                   u64 to_blk,
3423                                   u32 *first_hash)
3424 {
3425         int i, ret, credits;
3426         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3427         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3428         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3429         struct buffer_head *bh = NULL;
3430         struct ocfs2_xattr_header *xh;
3431         u64 to_blk_start = to_blk;
3432
3433         mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
3434
3435         /*
3436          * We need to update the new cluster and 1 more for the update of
3437          * the 1st bucket of the previous extent rec.
3438          */
3439         credits = bpc + 1;
3440         ret = ocfs2_extend_trans(handle, credits);
3441         if (ret) {
3442                 mlog_errno(ret);
3443                 goto out;
3444         }
3445
3446         ret = ocfs2_journal_access(handle, inode, first_bh,
3447                                    OCFS2_JOURNAL_ACCESS_WRITE);
3448         if (ret) {
3449                 mlog_errno(ret);
3450                 goto out;
3451         }
3452
3453         for (i = 0; i < num_buckets; i++) {
3454                 ret = ocfs2_cp_xattr_bucket(inode, handle,
3455                                             src_blk, to_blk, 1);
3456                 if (ret) {
3457                         mlog_errno(ret);
3458                         goto out;
3459                 }
3460
3461                 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3462                 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3463         }
3464
3465         /* update the old bucket header. */
3466         xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3467         le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
3468
3469         ocfs2_journal_dirty(handle, first_bh);
3470
3471         /* update the new bucket header. */
3472         ret = ocfs2_read_block(inode, to_blk_start, &bh);
3473         if (ret < 0) {
3474                 mlog_errno(ret);
3475                 goto out;
3476         }
3477
3478         ret = ocfs2_journal_access(handle, inode, bh,
3479                                    OCFS2_JOURNAL_ACCESS_WRITE);
3480         if (ret) {
3481                 mlog_errno(ret);
3482                 goto out;
3483         }
3484
3485         xh = (struct ocfs2_xattr_header *)bh->b_data;
3486         xh->xh_num_buckets = cpu_to_le16(num_buckets);
3487
3488         ocfs2_journal_dirty(handle, bh);
3489
3490         if (first_hash)
3491                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3492 out:
3493         brelse(bh);
3494         return ret;
3495 }
3496
3497 /*
3498  * Move half of the xattrs in this cluster to the new cluster.
3499  * This function should only be called when bucket size == cluster size.
3500  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
3501  */
3502 static int ocfs2_half_xattr_cluster(struct inode *inode,
3503                                     handle_t *handle,
3504                                     u64 prev_blk,
3505                                     u64 new_blk,
3506                                     u32 *first_hash)
3507 {
3508         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3509         int ret, credits = 2 * blk_per_bucket;
3510
3511         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
3512
3513         ret = ocfs2_extend_trans(handle, credits);
3514         if (ret) {
3515                 mlog_errno(ret);
3516                 return ret;
3517         }
3518
3519         /* Move half of the xattr in start_blk to the next bucket. */
3520         return  ocfs2_half_xattr_bucket(inode, handle, prev_blk,
3521                                         new_blk, first_hash, 1);
3522 }
3523
3524 /*
3525  * Move some xattrs from the old cluster to the new one since they are not
3526  * contiguous in ocfs2 xattr tree.
3527  *
3528  * new_blk starts a new separate cluster, and we will move some xattrs from
3529  * prev_blk to it. v_start will be set as the first name hash value in this
3530  * new cluster so that it can be used as e_cpos during tree insertion and
3531  * don't collide with our original b-tree operations. first_bh and header_bh
3532  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
3533  * to extend the insert bucket.
3534  *
3535  * The problem is how much xattr should we move to the new one and when should
3536  * we update first_bh and header_bh?
3537  * 1. If cluster size > bucket size, that means the previous cluster has more
3538  *    than 1 bucket, so just move half nums of bucket into the new cluster and
3539  *    update the first_bh and header_bh if the insert bucket has been moved
3540  *    to the new cluster.
3541  * 2. If cluster_size == bucket_size:
3542  *    a) If the previous extent rec has more than one cluster and the insert
3543  *       place isn't in the last cluster, copy the entire last cluster to the
3544  *       new one. This time, we don't need to upate the first_bh and header_bh
3545  *       since they will not be moved into the new cluster.
3546  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
3547  *       the new one. And we set the extend flag to zero if the insert place is
3548  *       moved into the new allocated cluster since no extend is needed.
3549  */
3550 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
3551                                             handle_t *handle,
3552                                             struct buffer_head **first_bh,
3553                                             struct buffer_head **header_bh,
3554                                             u64 new_blk,
3555                                             u64 prev_blk,
3556                                             u32 prev_clusters,
3557                                             u32 *v_start,
3558                                             int *extend)
3559 {
3560         int ret = 0;
3561         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3562
3563         mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
3564              prev_blk, prev_clusters, new_blk);
3565
3566         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
3567                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
3568                                                           handle,
3569                                                           first_bh,
3570                                                           header_bh,
3571                                                           new_blk,
3572                                                           prev_blk,
3573                                                           prev_clusters,
3574                                                           v_start);
3575         else {
3576                 u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
3577
3578                 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
3579                         ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
3580                                                      last_blk, new_blk,
3581                                                      v_start);
3582                 else {
3583                         ret = ocfs2_half_xattr_cluster(inode, handle,
3584                                                        last_blk, new_blk,
3585                                                        v_start);
3586
3587                         if ((*header_bh)->b_blocknr == last_blk && extend)
3588                                 *extend = 0;
3589                 }
3590         }
3591
3592         return ret;
3593 }
3594
3595 /*
3596  * Add a new cluster for xattr storage.
3597  *
3598  * If the new cluster is contiguous with the previous one, it will be
3599  * appended to the same extent record, and num_clusters will be updated.
3600  * If not, we will insert a new extent for it and move some xattrs in
3601  * the last cluster into the new allocated one.
3602  * We also need to limit the maximum size of a btree leaf, otherwise we'll
3603  * lose the benefits of hashing because we'll have to search large leaves.
3604  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
3605  * if it's bigger).
3606  *
3607  * first_bh is the first block of the previous extent rec and header_bh
3608  * indicates the bucket we will insert the new xattrs. They will be updated
3609  * when the header_bh is moved into the new cluster.
3610  */
3611 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
3612                                        struct buffer_head *root_bh,
3613                                        struct buffer_head **first_bh,
3614                                        struct buffer_head **header_bh,
3615                                        u32 *num_clusters,
3616                                        u32 prev_cpos,
3617                                        u64 prev_blkno,
3618                                        int *extend)
3619 {
3620         int ret, credits;
3621         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3622         u32 prev_clusters = *num_clusters;
3623         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
3624         u64 block;
3625         handle_t *handle = NULL;
3626         struct ocfs2_alloc_context *data_ac = NULL;
3627         struct ocfs2_alloc_context *meta_ac = NULL;
3628         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3629         struct ocfs2_extent_tree et;
3630
3631         mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
3632              "previous xattr blkno = %llu\n",
3633              (unsigned long long)OCFS2_I(inode)->ip_blkno,
3634              prev_cpos, prev_blkno);
3635
3636         ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
3637
3638         ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
3639                                     &data_ac, &meta_ac);
3640         if (ret) {
3641                 mlog_errno(ret);
3642                 goto leave;
3643         }
3644
3645         credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
3646                                             clusters_to_add);
3647         handle = ocfs2_start_trans(osb, credits);
3648         if (IS_ERR(handle)) {
3649                 ret = PTR_ERR(handle);
3650                 handle = NULL;
3651                 mlog_errno(ret);
3652                 goto leave;
3653         }
3654
3655         ret = ocfs2_journal_access(handle, inode, root_bh,
3656                                    OCFS2_JOURNAL_ACCESS_WRITE);
3657         if (ret < 0) {
3658                 mlog_errno(ret);
3659                 goto leave;
3660         }
3661
3662         ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
3663                                      clusters_to_add, &bit_off, &num_bits);
3664         if (ret < 0) {
3665                 if (ret != -ENOSPC)
3666                         mlog_errno(ret);
3667                 goto leave;
3668         }
3669
3670         BUG_ON(num_bits > clusters_to_add);
3671
3672         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
3673         mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
3674              num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
3675
3676         if (prev_blkno + prev_clusters * bpc == block &&
3677             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
3678              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
3679                 /*
3680                  * If this cluster is contiguous with the old one and
3681                  * adding this new cluster, we don't surpass the limit of
3682                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
3683                  * initialized and used like other buckets in the previous
3684                  * cluster.
3685                  * So add it as a contiguous one. The caller will handle
3686                  * its init process.
3687                  */
3688                 v_start = prev_cpos + prev_clusters;
3689                 *num_clusters = prev_clusters + num_bits;
3690                 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
3691                      num_bits);
3692         } else {
3693                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
3694                                                        handle,
3695                                                        first_bh,
3696                                                        header_bh,
3697                                                        block,
3698                                                        prev_blkno,
3699                                                        prev_clusters,
3700                                                        &v_start,
3701                                                        extend);
3702                 if (ret) {
3703                         mlog_errno(ret);
3704                         goto leave;
3705                 }
3706         }
3707
3708         if (handle->h_buffer_credits < credits) {
3709                 /*
3710                  * The journal has been restarted before, and don't
3711                  * have enough space for the insertion, so extend it
3712                  * here.
3713                  */
3714                 ret = ocfs2_extend_trans(handle, credits);
3715                 if (ret) {
3716                         mlog_errno(ret);
3717                         goto leave;
3718                 }
3719         }
3720         mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
3721              num_bits, block, v_start);
3722         ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
3723                                   num_bits, 0, meta_ac);
3724         if (ret < 0) {
3725                 mlog_errno(ret);
3726                 goto leave;
3727         }
3728
3729         ret = ocfs2_journal_dirty(handle, root_bh);
3730         if (ret < 0) {
3731                 mlog_errno(ret);
3732                 goto leave;
3733         }
3734
3735 leave:
3736         if (handle)
3737                 ocfs2_commit_trans(osb, handle);
3738         if (data_ac)
3739                 ocfs2_free_alloc_context(data_ac);
3740         if (meta_ac)
3741                 ocfs2_free_alloc_context(meta_ac);
3742
3743         return ret;
3744 }
3745
3746 /*
3747  * Extend a new xattr bucket and move xattrs to the end one by one until
3748  * We meet with start_bh. Only move half of the xattrs to the bucket after it.
3749  */
3750 static int ocfs2_extend_xattr_bucket(struct inode *inode,
3751                                      struct buffer_head *first_bh,
3752                                      struct buffer_head *start_bh,
3753                                      u32 num_clusters)
3754 {
3755         int ret, credits;
3756         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3757         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3758         u64 start_blk = start_bh->b_blocknr, end_blk;
3759         u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
3760         handle_t *handle;
3761         struct ocfs2_xattr_header *first_xh =
3762                                 (struct ocfs2_xattr_header *)first_bh->b_data;
3763         u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
3764
3765         mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
3766              "from %llu, len = %u\n", start_blk,
3767              (unsigned long long)first_bh->b_blocknr, num_clusters);
3768
3769         BUG_ON(bucket >= num_buckets);
3770
3771         end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
3772
3773         /*
3774          * We will touch all the buckets after the start_bh(include it).
3775          * Add one more bucket and modify the first_bh.
3776          */
3777         credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
3778         handle = ocfs2_start_trans(osb, credits);
3779         if (IS_ERR(handle)) {
3780                 ret = PTR_ERR(handle);
3781                 handle = NULL;
3782                 mlog_errno(ret);
3783                 goto out;
3784         }
3785
3786         ret = ocfs2_journal_access(handle, inode, first_bh,
3787                                    OCFS2_JOURNAL_ACCESS_WRITE);
3788         if (ret) {
3789                 mlog_errno(ret);
3790                 goto commit;
3791         }
3792
3793         while (end_blk != start_blk) {
3794                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
3795                                             end_blk + blk_per_bucket, 0);
3796                 if (ret)
3797                         goto commit;
3798                 end_blk -= blk_per_bucket;
3799         }
3800
3801         /* Move half of the xattr in start_blk to the next bucket. */
3802         ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
3803                                       start_blk + blk_per_bucket, NULL, 0);
3804
3805         le16_add_cpu(&first_xh->xh_num_buckets, 1);
3806         ocfs2_journal_dirty(handle, first_bh);
3807
3808 commit:
3809         ocfs2_commit_trans(osb, handle);
3810 out:
3811         return ret;
3812 }
3813
3814 /*
3815  * Add new xattr bucket in an extent record and adjust the buckets accordingly.
3816  * xb_bh is the ocfs2_xattr_block.
3817  * We will move all the buckets starting from header_bh to the next place. As
3818  * for this one, half num of its xattrs will be moved to the next one.
3819  *
3820  * We will allocate a new cluster if current cluster is full and adjust
3821  * header_bh and first_bh if the insert place is moved to the new cluster.
3822  */
3823 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
3824                                       struct buffer_head *xb_bh,
3825                                       struct buffer_head *header_bh)
3826 {
3827         struct ocfs2_xattr_header *first_xh = NULL;
3828         struct buffer_head *first_bh = NULL;
3829         struct ocfs2_xattr_block *xb =
3830                         (struct ocfs2_xattr_block *)xb_bh->b_data;
3831         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3832         struct ocfs2_extent_list *el = &xb_root->xt_list;
3833         struct ocfs2_xattr_header *xh =
3834                         (struct ocfs2_xattr_header *)header_bh->b_data;
3835         u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3836         struct super_block *sb = inode->i_sb;
3837         struct ocfs2_super *osb = OCFS2_SB(sb);
3838         int ret, num_buckets, extend = 1;
3839         u64 p_blkno;
3840         u32 e_cpos, num_clusters;
3841
3842         mlog(0, "Add new xattr bucket starting form %llu\n",
3843              (unsigned long long)header_bh->b_blocknr);
3844
3845         /*
3846          * Add refrence for header_bh here because it may be
3847          * changed in ocfs2_add_new_xattr_cluster and we need
3848          * to free it in the end.
3849          */
3850         get_bh(header_bh);
3851
3852         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
3853                                   &num_clusters, el);
3854         if (ret) {
3855                 mlog_errno(ret);
3856                 goto out;
3857         }
3858
3859         ret = ocfs2_read_block(inode, p_blkno, &first_bh);
3860         if (ret) {
3861                 mlog_errno(ret);
3862                 goto out;
3863         }
3864
3865         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
3866         first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3867
3868         if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
3869                 ret = ocfs2_add_new_xattr_cluster(inode,
3870                                                   xb_bh,
3871                                                   &first_bh,
3872                                                   &header_bh,
3873                                                   &num_clusters,
3874                                                   e_cpos,
3875                                                   p_blkno,
3876                                                   &extend);
3877                 if (ret) {
3878                         mlog_errno(ret);
3879                         goto out;
3880                 }
3881         }
3882
3883         if (extend)
3884                 ret = ocfs2_extend_xattr_bucket(inode,
3885                                                 first_bh,
3886                                                 header_bh,
3887                                                 num_clusters);
3888         if (ret)
3889                 mlog_errno(ret);
3890 out:
3891         brelse(first_bh);
3892         brelse(header_bh);
3893         return ret;
3894 }
3895
3896 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
3897                                         struct ocfs2_xattr_bucket *bucket,
3898                                         int offs)
3899 {
3900         int block_off = offs >> inode->i_sb->s_blocksize_bits;
3901
3902         offs = offs % inode->i_sb->s_blocksize;
3903         return bucket->bhs[block_off]->b_data + offs;
3904 }
3905
3906 /*
3907  * Handle the normal xattr set, including replace, delete and new.
3908  *
3909  * Note: "local" indicates the real data's locality. So we can't
3910  * just its bucket locality by its length.
3911  */
3912 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
3913                                          struct ocfs2_xattr_info *xi,
3914                                          struct ocfs2_xattr_search *xs,
3915                                          u32 name_hash,
3916                                          int local)
3917 {
3918         struct ocfs2_xattr_entry *last, *xe;
3919         int name_len = strlen(xi->name);
3920         struct ocfs2_xattr_header *xh = xs->header;
3921         u16 count = le16_to_cpu(xh->xh_count), start;
3922         size_t blocksize = inode->i_sb->s_blocksize;
3923         char *val;
3924         size_t offs, size, new_size;
3925
3926         last = &xh->xh_entries[count];
3927         if (!xs->not_found) {
3928                 xe = xs->here;
3929                 offs = le16_to_cpu(xe->xe_name_offset);
3930                 if (ocfs2_xattr_is_local(xe))
3931                         size = OCFS2_XATTR_SIZE(name_len) +
3932                         OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3933                 else
3934                         size = OCFS2_XATTR_SIZE(name_len) +
3935                         OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
3936
3937                 /*
3938                  * If the new value will be stored outside, xi->value has been
3939                  * initalized as an empty ocfs2_xattr_value_root, and the same
3940                  * goes with xi->value_len, so we can set new_size safely here.
3941                  * See ocfs2_xattr_set_in_bucket.
3942                  */
3943                 new_size = OCFS2_XATTR_SIZE(name_len) +
3944                            OCFS2_XATTR_SIZE(xi->value_len);
3945
3946                 le16_add_cpu(&xh->xh_name_value_len, -size);
3947                 if (xi->value) {
3948                         if (new_size > size)
3949                                 goto set_new_name_value;
3950
3951                         /* Now replace the old value with new one. */
3952                         if (local)
3953                                 xe->xe_value_size = cpu_to_le64(xi->value_len);
3954                         else
3955                                 xe->xe_value_size = 0;
3956
3957                         val = ocfs2_xattr_bucket_get_val(inode,
3958                                                          &xs->bucket, offs);
3959                         memset(val + OCFS2_XATTR_SIZE(name_len), 0,
3960                                size - OCFS2_XATTR_SIZE(name_len));
3961                         if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
3962                                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
3963                                        xi->value, xi->value_len);
3964
3965                         le16_add_cpu(&xh->xh_name_value_len, new_size);
3966                         ocfs2_xattr_set_local(xe, local);
3967                         return;
3968                 } else {
3969                         /*
3970                          * Remove the old entry if there is more than one.
3971                          * We don't remove the last entry so that we can
3972                          * use it to indicate the hash value of the empty
3973                          * bucket.
3974                          */
3975                         last -= 1;
3976                         le16_add_cpu(&xh->xh_count, -1);
3977                         if (xh->xh_count) {
3978                                 memmove(xe, xe + 1,
3979                                         (void *)last - (void *)xe);
3980                                 memset(last, 0,
3981                                        sizeof(struct ocfs2_xattr_entry));
3982                         } else
3983                                 xh->xh_free_start =
3984                                         cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3985
3986                         return;
3987                 }
3988         } else {
3989                 /* find a new entry for insert. */
3990                 int low = 0, high = count - 1, tmp;
3991                 struct ocfs2_xattr_entry *tmp_xe;
3992
3993                 while (low <= high && count) {
3994                         tmp = (low + high) / 2;
3995                         tmp_xe = &xh->xh_entries[tmp];
3996
3997                         if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
3998                                 low = tmp + 1;
3999                         else if (name_hash <
4000                                  le32_to_cpu(tmp_xe->xe_name_hash))
4001                                 high = tmp - 1;
4002                         else {
4003                                 low = tmp;
4004                                 break;
4005                         }
4006                 }
4007
4008                 xe = &xh->xh_entries[low];
4009                 if (low != count)
4010                         memmove(xe + 1, xe, (void *)last - (void *)xe);
4011
4012                 le16_add_cpu(&xh->xh_count, 1);
4013                 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4014                 xe->xe_name_hash = cpu_to_le32(name_hash);
4015                 xe->xe_name_len = name_len;
4016                 ocfs2_xattr_set_type(xe, xi->name_index);
4017         }
4018
4019 set_new_name_value:
4020         /* Insert the new name+value. */
4021         size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4022
4023         /*
4024          * We must make sure that the name/value pair
4025          * exists in the same block.
4026          */
4027         offs = le16_to_cpu(xh->xh_free_start);
4028         start = offs - size;
4029
4030         if (start >> inode->i_sb->s_blocksize_bits !=
4031             (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4032                 offs = offs - offs % blocksize;
4033                 xh->xh_free_start = cpu_to_le16(offs);
4034         }
4035
4036         val = ocfs2_xattr_bucket_get_val(inode,
4037                                          &xs->bucket, offs - size);
4038         xe->xe_name_offset = cpu_to_le16(offs - size);
4039
4040         memset(val, 0, size);
4041         memcpy(val, xi->name, name_len);
4042         memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4043
4044         xe->xe_value_size = cpu_to_le64(xi->value_len);
4045         ocfs2_xattr_set_local(xe, local);
4046         xs->here = xe;
4047         le16_add_cpu(&xh->xh_free_start, -size);
4048         le16_add_cpu(&xh->xh_name_value_len, size);
4049
4050         return;
4051 }
4052
4053 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
4054                                              handle_t *handle,
4055                                              struct ocfs2_xattr_search *xs,
4056                                              struct buffer_head **bhs,
4057                                              u16 bh_num)
4058 {
4059         int ret = 0, off, block_off;
4060         struct ocfs2_xattr_entry *xe = xs->here;
4061
4062         /*
4063          * First calculate all the blocks we should journal_access
4064          * and journal_dirty. The first block should always be touched.
4065          */
4066         ret = ocfs2_journal_dirty(handle, bhs[0]);
4067         if (ret)
4068                 mlog_errno(ret);
4069
4070         /* calc the data. */
4071         off = le16_to_cpu(xe->xe_name_offset);
4072         block_off = off >> inode->i_sb->s_blocksize_bits;
4073         ret = ocfs2_journal_dirty(handle, bhs[block_off]);
4074         if (ret)
4075                 mlog_errno(ret);
4076
4077         return ret;
4078 }
4079
4080 /*
4081  * Set the xattr entry in the specified bucket.
4082  * The bucket is indicated by xs->bucket and it should have the enough
4083  * space for the xattr insertion.
4084  */
4085 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4086                                            struct ocfs2_xattr_info *xi,
4087                                            struct ocfs2_xattr_search *xs,
4088                                            u32 name_hash,
4089                                            int local)
4090 {
4091         int i, ret;
4092         handle_t *handle = NULL;
4093         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4094         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4095
4096         mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4097              (unsigned long)xi->value_len, xi->name_index,
4098              (unsigned long long)xs->bucket.bhs[0]->b_blocknr);
4099
4100         if (!xs->bucket.bhs[1]) {
4101                 ret = ocfs2_read_blocks(inode,
4102                                         xs->bucket.bhs[0]->b_blocknr + 1,
4103                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
4104                                         OCFS2_BH_CACHED);
4105                 if (ret) {
4106                         mlog_errno(ret);
4107                         goto out;
4108                 }
4109         }
4110
4111         handle = ocfs2_start_trans(osb, blk_per_bucket);
4112         if (IS_ERR(handle)) {
4113                 ret = PTR_ERR(handle);
4114                 handle = NULL;
4115                 mlog_errno(ret);
4116                 goto out;
4117         }
4118
4119         for (i = 0; i < blk_per_bucket; i++) {
4120                 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
4121                                            OCFS2_JOURNAL_ACCESS_WRITE);
4122                 if (ret < 0) {
4123                         mlog_errno(ret);
4124                         goto out;
4125                 }
4126         }
4127
4128         ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4129
4130         /*Only dirty the blocks we have touched in set xattr. */
4131         ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
4132                                                 xs->bucket.bhs, blk_per_bucket);
4133         if (ret)
4134                 mlog_errno(ret);
4135 out:
4136         ocfs2_commit_trans(osb, handle);
4137
4138         return ret;
4139 }
4140
4141 static int ocfs2_xattr_value_update_size(struct inode *inode,
4142                                          struct buffer_head *xe_bh,
4143                                          struct ocfs2_xattr_entry *xe,
4144                                          u64 new_size)
4145 {
4146         int ret;
4147         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4148         handle_t *handle = NULL;
4149
4150         handle = ocfs2_start_trans(osb, 1);
4151         if (handle == NULL) {
4152                 ret = -ENOMEM;
4153                 mlog_errno(ret);
4154                 goto out;
4155         }
4156
4157         ret = ocfs2_journal_access(handle, inode, xe_bh,
4158                                    OCFS2_JOURNAL_ACCESS_WRITE);
4159         if (ret < 0) {
4160                 mlog_errno(ret);
4161                 goto out_commit;
4162         }
4163
4164         xe->xe_value_size = cpu_to_le64(new_size);
4165
4166         ret = ocfs2_journal_dirty(handle, xe_bh);
4167         if (ret < 0)
4168                 mlog_errno(ret);
4169
4170 out_commit:
4171         ocfs2_commit_trans(osb, handle);
4172 out:
4173         return ret;
4174 }
4175
4176 /*
4177  * Truncate the specified xe_off entry in xattr bucket.
4178  * bucket is indicated by header_bh and len is the new length.
4179  * Both the ocfs2_xattr_value_root and the entry will be updated here.
4180  *
4181  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4182  */
4183 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4184                                              struct buffer_head *header_bh,
4185                                              int xe_off,
4186                                              int len)
4187 {
4188         int ret, offset;
4189         u64 value_blk;
4190         struct buffer_head *value_bh = NULL;
4191         struct ocfs2_xattr_value_root *xv;
4192         struct ocfs2_xattr_entry *xe;
4193         struct ocfs2_xattr_header *xh =
4194                         (struct ocfs2_xattr_header *)header_bh->b_data;
4195         size_t blocksize = inode->i_sb->s_blocksize;
4196
4197         xe = &xh->xh_entries[xe_off];
4198
4199         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4200
4201         offset = le16_to_cpu(xe->xe_name_offset) +
4202                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4203
4204         value_blk = offset / blocksize;
4205
4206         /* We don't allow ocfs2_xattr_value to be stored in different block. */
4207         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4208         value_blk += header_bh->b_blocknr;
4209
4210         ret = ocfs2_read_block(inode, value_blk, &value_bh);
4211         if (ret) {
4212                 mlog_errno(ret);
4213                 goto out;
4214         }
4215
4216         xv = (struct ocfs2_xattr_value_root *)
4217                 (value_bh->b_data + offset % blocksize);
4218
4219         mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4220              xe_off, (unsigned long long)header_bh->b_blocknr, len);
4221         ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
4222         if (ret) {
4223                 mlog_errno(ret);
4224                 goto out;
4225         }
4226
4227         ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
4228         if (ret) {
4229                 mlog_errno(ret);
4230                 goto out;
4231         }
4232
4233 out:
4234         brelse(value_bh);
4235         return ret;
4236 }
4237
4238 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4239                                                 struct ocfs2_xattr_search *xs,
4240                                                 int len)
4241 {
4242         int ret, offset;
4243         struct ocfs2_xattr_entry *xe = xs->here;
4244         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4245
4246         BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4247
4248         offset = xe - xh->xh_entries;
4249         ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
4250                                                 offset, len);
4251         if (ret)
4252                 mlog_errno(ret);
4253
4254         return ret;
4255 }
4256
4257 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4258                                                 struct ocfs2_xattr_search *xs,
4259                                                 char *val,
4260                                                 int value_len)
4261 {
4262         int offset;
4263         struct ocfs2_xattr_value_root *xv;
4264         struct ocfs2_xattr_entry *xe = xs->here;
4265
4266         BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4267
4268         offset = le16_to_cpu(xe->xe_name_offset) +
4269                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4270
4271         xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
4272
4273         return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
4274 }
4275
4276 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4277                                   struct buffer_head *root_bh,
4278                                   u64 blkno,
4279                                   u32 cpos,
4280                                   u32 len)
4281 {
4282         int ret;
4283         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4284         struct inode *tl_inode = osb->osb_tl_inode;
4285         handle_t *handle;
4286         struct ocfs2_xattr_block *xb =
4287                         (struct ocfs2_xattr_block *)root_bh->b_data;
4288         struct ocfs2_alloc_context *meta_ac = NULL;
4289         struct ocfs2_cached_dealloc_ctxt dealloc;
4290         struct ocfs2_extent_tree et;
4291
4292         ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
4293
4294         ocfs2_init_dealloc_ctxt(&dealloc);
4295
4296         mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4297              cpos, len, (unsigned long long)blkno);
4298
4299         ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4300
4301         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4302         if (ret) {
4303                 mlog_errno(ret);
4304                 return ret;
4305         }
4306
4307         mutex_lock(&tl_inode->i_mutex);
4308
4309         if (ocfs2_truncate_log_needs_flush(osb)) {
4310                 ret = __ocfs2_flush_truncate_log(osb);
4311                 if (ret < 0) {
4312                         mlog_errno(ret);
4313                         goto out;
4314                 }
4315         }
4316
4317         handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
4318         if (handle == NULL) {
4319                 ret = -ENOMEM;
4320                 mlog_errno(ret);
4321                 goto out;
4322         }
4323
4324         ret = ocfs2_journal_access(handle, inode, root_bh,
4325                                    OCFS2_JOURNAL_ACCESS_WRITE);
4326         if (ret) {
4327                 mlog_errno(ret);
4328                 goto out_commit;
4329         }
4330
4331         ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
4332                                   &dealloc);
4333         if (ret) {
4334                 mlog_errno(ret);
4335                 goto out_commit;
4336         }
4337
4338         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4339
4340         ret = ocfs2_journal_dirty(handle, root_bh);
4341         if (ret) {
4342                 mlog_errno(ret);
4343                 goto out_commit;
4344         }
4345
4346         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4347         if (ret)
4348                 mlog_errno(ret);
4349
4350 out_commit:
4351         ocfs2_commit_trans(osb, handle);
4352 out:
4353         ocfs2_schedule_truncate_log_flush(osb, 1);
4354
4355         mutex_unlock(&tl_inode->i_mutex);
4356
4357         if (meta_ac)
4358                 ocfs2_free_alloc_context(meta_ac);
4359
4360         ocfs2_run_deallocs(osb, &dealloc);
4361
4362         return ret;
4363 }
4364
4365 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4366                                          struct ocfs2_xattr_search *xs)
4367 {
4368         handle_t *handle = NULL;
4369         struct ocfs2_xattr_header *xh = xs->bucket.xh;
4370         struct ocfs2_xattr_entry *last = &xh->xh_entries[
4371                                                 le16_to_cpu(xh->xh_count) - 1];
4372         int ret = 0;
4373
4374         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
4375         if (IS_ERR(handle)) {
4376                 ret = PTR_ERR(handle);
4377                 mlog_errno(ret);
4378                 return;
4379         }
4380
4381         ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
4382                                    OCFS2_JOURNAL_ACCESS_WRITE);
4383         if (ret) {
4384                 mlog_errno(ret);
4385                 goto out_commit;
4386         }
4387
4388         /* Remove the old entry. */
4389         memmove(xs->here, xs->here + 1,
4390                 (void *)last - (void *)xs->here);
4391         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4392         le16_add_cpu(&xh->xh_count, -1);
4393
4394         ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
4395         if (ret < 0)
4396                 mlog_errno(ret);
4397 out_commit:
4398         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
4399 }
4400
4401 /*
4402  * Set the xattr name/value in the bucket specified in xs.
4403  *
4404  * As the new value in xi may be stored in the bucket or in an outside cluster,
4405  * we divide the whole process into 3 steps:
4406  * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4407  * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4408  * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4409  * 4. If the clusters for the new outside value can't be allocated, we need
4410  *    to free the xattr we allocated in set.
4411  */
4412 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4413                                      struct ocfs2_xattr_info *xi,
4414                                      struct ocfs2_xattr_search *xs)
4415 {
4416         int ret, local = 1;
4417         size_t value_len;
4418         char *val = (char *)xi->value;
4419         struct ocfs2_xattr_entry *xe = xs->here;
4420         u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
4421                                               strlen(xi->name));
4422
4423         if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4424                 /*
4425                  * We need to truncate the xattr storage first.
4426                  *
4427                  * If both the old and new value are stored to
4428                  * outside block, we only need to truncate
4429                  * the storage and then set the value outside.
4430                  *
4431                  * If the new value should be stored within block,
4432                  * we should free all the outside block first and
4433                  * the modification to the xattr block will be done
4434                  * by following steps.
4435                  */
4436                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4437                         value_len = xi->value_len;
4438                 else
4439                         value_len = 0;
4440
4441                 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4442                                                            value_len);
4443                 if (ret)
4444                         goto out;
4445
4446                 if (value_len)
4447                         goto set_value_outside;
4448         }
4449
4450         value_len = xi->value_len;
4451         /* So we have to handle the inside block change now. */
4452         if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4453                 /*
4454                  * If the new value will be stored outside of block,
4455                  * initalize a new empty value root and insert it first.
4456                  */
4457                 local = 0;
4458                 xi->value = &def_xv;
4459                 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4460         }
4461
4462         ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local);
4463         if (ret) {
4464                 mlog_errno(ret);
4465                 goto out;
4466         }
4467
4468         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
4469                 goto out;
4470
4471         /* allocate the space now for the outside block storage. */
4472         ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4473                                                    value_len);
4474         if (ret) {
4475                 mlog_errno(ret);
4476
4477                 if (xs->not_found) {
4478                         /*
4479                          * We can't allocate enough clusters for outside
4480                          * storage and we have allocated xattr already,
4481                          * so need to remove it.
4482                          */
4483                         ocfs2_xattr_bucket_remove_xs(inode, xs);
4484                 }
4485                 goto out;
4486         }
4487
4488 set_value_outside:
4489         ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
4490 out:
4491         return ret;
4492 }
4493
4494 /* check whether the xattr bucket is filled up with the same hash value. */
4495 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
4496                                               struct ocfs2_xattr_bucket *bucket)
4497 {
4498         struct ocfs2_xattr_header *xh = bucket->xh;
4499
4500         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
4501             xh->xh_entries[0].xe_name_hash) {
4502                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
4503                      "hash = %u\n",
4504                      (unsigned long long)bucket->bhs[0]->b_blocknr,
4505                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
4506                 return -ENOSPC;
4507         }
4508
4509         return 0;
4510 }
4511
4512 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
4513                                              struct ocfs2_xattr_info *xi,
4514                                              struct ocfs2_xattr_search *xs)
4515 {
4516         struct ocfs2_xattr_header *xh;
4517         struct ocfs2_xattr_entry *xe;
4518         u16 count, header_size, xh_free_start;
4519         int i, free, max_free, need, old;
4520         size_t value_size = 0, name_len = strlen(xi->name);
4521         size_t blocksize = inode->i_sb->s_blocksize;
4522         int ret, allocation = 0;
4523         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4524
4525         mlog_entry("Set xattr %s in xattr index block\n", xi->name);
4526
4527 try_again:
4528         xh = xs->header;
4529         count = le16_to_cpu(xh->xh_count);
4530         xh_free_start = le16_to_cpu(xh->xh_free_start);
4531         header_size = sizeof(struct ocfs2_xattr_header) +
4532                         count * sizeof(struct ocfs2_xattr_entry);
4533         max_free = OCFS2_XATTR_BUCKET_SIZE -
4534                 le16_to_cpu(xh->xh_name_value_len) - header_size;
4535
4536         mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
4537                         "of %u which exceed block size\n",
4538                         (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4539                         header_size);
4540
4541         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4542                 value_size = OCFS2_XATTR_ROOT_SIZE;
4543         else if (xi->value)
4544                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
4545
4546         if (xs->not_found)
4547                 need = sizeof(struct ocfs2_xattr_entry) +
4548                         OCFS2_XATTR_SIZE(name_len) + value_size;
4549         else {
4550                 need = value_size + OCFS2_XATTR_SIZE(name_len);
4551
4552                 /*
4553                  * We only replace the old value if the new length is smaller
4554                  * than the old one. Otherwise we will allocate new space in the
4555                  * bucket to store it.
4556                  */
4557                 xe = xs->here;
4558                 if (ocfs2_xattr_is_local(xe))
4559                         old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4560                 else
4561                         old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4562
4563                 if (old >= value_size)
4564                         need = 0;
4565         }
4566
4567         free = xh_free_start - header_size;
4568         /*
4569          * We need to make sure the new name/value pair
4570          * can exist in the same block.
4571          */
4572         if (xh_free_start % blocksize < need)
4573                 free -= xh_free_start % blocksize;
4574
4575         mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
4576              "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
4577              " %u\n", xs->not_found,
4578              (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4579              free, need, max_free, le16_to_cpu(xh->xh_free_start),
4580              le16_to_cpu(xh->xh_name_value_len));
4581
4582         if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4583                 if (need <= max_free &&
4584                     count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4585                         /*
4586                          * We can create the space by defragment. Since only the
4587                          * name/value will be moved, the xe shouldn't be changed
4588                          * in xs.
4589                          */
4590                         ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
4591                         if (ret) {
4592                                 mlog_errno(ret);
4593                                 goto out;
4594                         }
4595
4596                         xh_free_start = le16_to_cpu(xh->xh_free_start);
4597                         free = xh_free_start - header_size;
4598                         if (xh_free_start % blocksize < need)
4599                                 free -= xh_free_start % blocksize;
4600
4601                         if (free >= need)
4602                                 goto xattr_set;
4603
4604                         mlog(0, "Can't get enough space for xattr insert by "
4605                              "defragment. Need %u bytes, but we have %d, so "
4606                              "allocate new bucket for it.\n", need, free);
4607                 }
4608
4609                 /*
4610                  * We have to add new buckets or clusters and one
4611                  * allocation should leave us enough space for insert.
4612                  */
4613                 BUG_ON(allocation);
4614
4615                 /*
4616                  * We do not allow for overlapping ranges between buckets. And
4617                  * the maximum number of collisions we will allow for then is
4618                  * one bucket's worth, so check it here whether we need to
4619                  * add a new bucket for the insert.
4620                  */
4621                 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
4622                 if (ret) {
4623                         mlog_errno(ret);
4624                         goto out;
4625                 }
4626
4627                 ret = ocfs2_add_new_xattr_bucket(inode,
4628                                                  xs->xattr_bh,
4629                                                  xs->bucket.bhs[0]);
4630                 if (ret) {
4631                         mlog_errno(ret);
4632                         goto out;
4633                 }
4634
4635                 for (i = 0; i < blk_per_bucket; i++)
4636                         brelse(xs->bucket.bhs[i]);
4637
4638                 memset(&xs->bucket, 0, sizeof(xs->bucket));
4639
4640                 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
4641                                                    xi->name_index,
4642                                                    xi->name, xs);
4643                 if (ret && ret != -ENODATA)
4644                         goto out;
4645                 xs->not_found = ret;
4646                 allocation = 1;
4647                 goto try_again;
4648         }
4649
4650 xattr_set:
4651         ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
4652 out:
4653         mlog_exit(ret);
4654         return ret;
4655 }
4656
4657 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
4658                                         struct ocfs2_xattr_bucket *bucket,
4659                                         void *para)
4660 {
4661         int ret = 0;
4662         struct ocfs2_xattr_header *xh = bucket->xh;
4663         u16 i;
4664         struct ocfs2_xattr_entry *xe;
4665
4666         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4667                 xe = &xh->xh_entries[i];
4668                 if (ocfs2_xattr_is_local(xe))
4669                         continue;
4670
4671                 ret = ocfs2_xattr_bucket_value_truncate(inode,
4672                                                         bucket->bhs[0],
4673                                                         i, 0);
4674                 if (ret) {
4675                         mlog_errno(ret);
4676                         break;
4677                 }
4678         }
4679
4680         return ret;
4681 }
4682
4683 static int ocfs2_delete_xattr_index_block(struct inode *inode,
4684                                           struct buffer_head *xb_bh)
4685 {
4686         struct ocfs2_xattr_block *xb =
4687                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4688         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4689         int ret = 0;
4690         u32 name_hash = UINT_MAX, e_cpos, num_clusters;
4691         u64 p_blkno;
4692
4693         if (le16_to_cpu(el->l_next_free_rec) == 0)
4694                 return 0;
4695
4696         while (name_hash > 0) {
4697                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4698                                           &e_cpos, &num_clusters, el);
4699                 if (ret) {
4700                         mlog_errno(ret);
4701                         goto out;
4702                 }
4703
4704                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
4705                                                   ocfs2_delete_xattr_in_bucket,
4706                                                   NULL);
4707                 if (ret) {
4708                         mlog_errno(ret);
4709                         goto out;
4710                 }
4711
4712                 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
4713                                              p_blkno, e_cpos, num_clusters);
4714                 if (ret) {
4715                         mlog_errno(ret);
4716                         break;
4717                 }
4718
4719                 if (e_cpos == 0)
4720                         break;
4721
4722                 name_hash = e_cpos - 1;
4723         }
4724
4725 out:
4726         return ret;
4727 }
4728
4729 /*
4730  * 'trusted' attributes support
4731  */
4732
4733 #define XATTR_TRUSTED_PREFIX "trusted."
4734
4735 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
4736                                        size_t list_size, const char *name,
4737                                        size_t name_len)
4738 {
4739         const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX) - 1;
4740         const size_t total_len = prefix_len + name_len + 1;
4741
4742         if (list && total_len <= list_size) {
4743                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
4744                 memcpy(list + prefix_len, name, name_len);
4745                 list[prefix_len + name_len] = '\0';
4746         }
4747         return total_len;
4748 }
4749
4750 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
4751                                    void *buffer, size_t size)
4752 {
4753         if (strcmp(name, "") == 0)
4754                 return -EINVAL;
4755         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
4756                                buffer, size);
4757 }
4758
4759 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
4760                                    const void *value, size_t size, int flags)
4761 {
4762         if (strcmp(name, "") == 0)
4763                 return -EINVAL;
4764
4765         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
4766                                size, flags);
4767 }
4768
4769 struct xattr_handler ocfs2_xattr_trusted_handler = {
4770         .prefix = XATTR_TRUSTED_PREFIX,
4771         .list   = ocfs2_xattr_trusted_list,
4772         .get    = ocfs2_xattr_trusted_get,
4773         .set    = ocfs2_xattr_trusted_set,
4774 };
4775
4776
4777 /*
4778  * 'user' attributes support
4779  */
4780
4781 #define XATTR_USER_PREFIX "user."
4782
4783 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
4784                                     size_t list_size, const char *name,
4785                                     size_t name_len)
4786 {
4787         const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1;
4788         const size_t total_len = prefix_len + name_len + 1;
4789         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4790
4791         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4792                 return 0;
4793
4794         if (list && total_len <= list_size) {
4795                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
4796                 memcpy(list + prefix_len, name, name_len);
4797                 list[prefix_len + name_len] = '\0';
4798         }
4799         return total_len;
4800 }
4801
4802 static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
4803                                 void *buffer, size_t size)
4804 {
4805         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4806
4807         if (strcmp(name, "") == 0)
4808                 return -EINVAL;
4809         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4810                 return -EOPNOTSUPP;
4811         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
4812                                buffer, size);
4813 }
4814
4815 static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
4816                                 const void *value, size_t size, int flags)
4817 {
4818         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4819
4820         if (strcmp(name, "") == 0)
4821                 return -EINVAL;
4822         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4823                 return -EOPNOTSUPP;
4824
4825         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
4826                                size, flags);
4827 }
4828
4829 struct xattr_handler ocfs2_xattr_user_handler = {
4830         .prefix = XATTR_USER_PREFIX,
4831         .list   = ocfs2_xattr_user_list,
4832         .get    = ocfs2_xattr_user_get,
4833         .set    = ocfs2_xattr_user_set,
4834 };