fs/ocfs2/xattr.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * xattr.c
   5  *
   6  * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
   7  *
   8  * CREDITS:
   9  * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
  10  * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public
  14  * License version 2 as published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  */
  21
  22 #include <linux/capability.h>
  23 #include <linux/fs.h>
  24 #include <linux/types.h>
  25 #include <linux/slab.h>
  26 #include <linux/highmem.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/uio.h>
  29 #include <linux/sched.h>
  30 #include <linux/splice.h>
  31 #include <linux/mount.h>
  32 #include <linux/writeback.h>
  33 #include <linux/falloc.h>
  34 #include <linux/sort.h>
  35 #include <linux/init.h>
  36 #include <linux/module.h>
  37 #include <linux/string.h>
  38
  39 #define MLOG_MASK_PREFIX ML_XATTR
  40 #include <cluster/masklog.h>
  41
  42 #include "ocfs2.h"
  43 #include "alloc.h"
  44 #include "dlmglue.h"
  45 #include "file.h"
  46 #include "symlink.h"
  47 #include "sysfile.h"
  48 #include "inode.h"
  49 #include "journal.h"
  50 #include "ocfs2_fs.h"
  51 #include "suballoc.h"
  52 #include "uptodate.h"
  53 #include "buffer_head_io.h"
  54 #include "super.h"
  55 #include "xattr.h"
  56
  57
  58 struct ocfs2_xattr_def_value_root {
  59         struct ocfs2_xattr_value_root   xv;
  60         struct ocfs2_extent_rec         er;
  61 };
  62
  63 struct ocfs2_xattr_bucket {
  64         struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
  65         struct ocfs2_xattr_header *xh;
  66 };
  67
  68 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
  69 #define OCFS2_XATTR_INLINE_SIZE 80
  70
  71 static struct ocfs2_xattr_def_value_root def_xv = {
  72         .xv.xr_list.l_count = cpu_to_le16(1),
  73 };
  74
  75 struct xattr_handler *ocfs2_xattr_handlers[] = {
  76         &ocfs2_xattr_user_handler,
  77         &ocfs2_xattr_trusted_handler,
  78         NULL
  79 };
  80
  81 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
  82         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
  83         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
  84 };
  85
  86 struct ocfs2_xattr_info {
  87         int name_index;
  88         const char *name;
  89         const void *value;
  90         size_t value_len;
  91 };
  92
  93 struct ocfs2_xattr_search {
  94         struct buffer_head *inode_bh;
  95         /*
  96          * xattr_bh point to the block buffer head which has extended attribute
  97          * when extended attribute in inode, xattr_bh is equal to inode_bh.
  98          */
  99         struct buffer_head *xattr_bh;
 100         struct ocfs2_xattr_header *header;
 101         struct ocfs2_xattr_bucket bucket;
 102         void *base;
 103         void *end;
 104         struct ocfs2_xattr_entry *here;
 105         int not_found;
 106 };
 107
 108 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
 109                                              struct ocfs2_xattr_header *xh,
 110                                              int index,
 111                                              int *block_off,
 112                                              int *new_offset);
 113
 114 static int ocfs2_xattr_block_find(struct inode *inode,
 115                                   int name_index,
 116                                   const char *name,
 117                                   struct ocfs2_xattr_search *xs);
 118 static int ocfs2_xattr_index_block_find(struct inode *inode,
 119                                         struct buffer_head *root_bh,
 120                                         int name_index,
 121                                         const char *name,
 122                                         struct ocfs2_xattr_search *xs);
 123
 124 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
 125                                         struct ocfs2_xattr_tree_root *xt,
 126                                         char *buffer,
 127                                         size_t buffer_size);
 128
 129 static int ocfs2_xattr_create_index_block(struct inode *inode,
 130                                           struct ocfs2_xattr_search *xs);
 131
 132 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
 133                                              struct ocfs2_xattr_info *xi,
 134                                              struct ocfs2_xattr_search *xs);
 135
 136 static int ocfs2_delete_xattr_index_block(struct inode *inode,
 137                                           struct buffer_head *xb_bh);
 138
 139 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
 140 {
 141         return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
 142 }
 143
 144 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
 145 {
 146         return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
 147 }
 148
 149 static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
 150 {
 151         u16 len = sb->s_blocksize -
 152                  offsetof(struct ocfs2_xattr_header, xh_entries);
 153
 154         return len / sizeof(struct ocfs2_xattr_entry);
 155 }
 156
 157 static inline const char *ocfs2_xattr_prefix(int name_index)
 158 {
 159         struct xattr_handler *handler = NULL;
 160
 161         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
 162                 handler = ocfs2_xattr_handler_map[name_index];
 163
 164         return handler ? handler->prefix : NULL;
 165 }
 166
 167 static u32 ocfs2_xattr_name_hash(struct inode *inode,
 168                                  const char *name,
 169                                  int name_len)
 170 {
 171         /* Get hash value of uuid from super block */
 172         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
 173         int i;
 174
 175         /* hash extended attribute name */
 176         for (i = 0; i < name_len; i++) {
 177                 hash = (hash << OCFS2_HASH_SHIFT) ^
 178                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 179                        *name++;
 180         }
 181
 182         return hash;
 183 }
 184
 185 /*
 186  * ocfs2_xattr_hash_entry()
 187  *
 188  * Compute the hash of an extended attribute.
 189  */
 190 static void ocfs2_xattr_hash_entry(struct inode *inode,
 191                                    struct ocfs2_xattr_header *header,
 192                                    struct ocfs2_xattr_entry *entry)
 193 {
 194         u32 hash = 0;
 195         char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
 196
 197         hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
 198         entry->xe_name_hash = cpu_to_le32(hash);
 199
 200         return;
 201 }
 202
 203 static int ocfs2_xattr_extend_allocation(struct inode *inode,
 204                                          u32 clusters_to_add,
 205                                          struct buffer_head *xattr_bh,
 206                                          struct ocfs2_xattr_value_root *xv)
 207 {
 208         int status = 0;
 209         int restart_func = 0;
 210         int credits = 0;
 211         handle_t *handle = NULL;
 212         struct ocfs2_alloc_context *data_ac = NULL;
 213         struct ocfs2_alloc_context *meta_ac = NULL;
 214         enum ocfs2_alloc_restarted why;
 215         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 216         u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
 217         struct ocfs2_extent_tree et;
 218
 219         mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
 220
 221         ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
 222
 223 restart_all:
 224
 225         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
 226                                        &data_ac, &meta_ac);
 227         if (status) {
 228                 mlog_errno(status);
 229                 goto leave;
 230         }
 231
 232         credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
 233                                             clusters_to_add);
 234         handle = ocfs2_start_trans(osb, credits);
 235         if (IS_ERR(handle)) {
 236                 status = PTR_ERR(handle);
 237                 handle = NULL;
 238                 mlog_errno(status);
 239                 goto leave;
 240         }
 241
 242 restarted_transaction:
 243         status = ocfs2_journal_access(handle, inode, xattr_bh,
 244                                       OCFS2_JOURNAL_ACCESS_WRITE);
 245         if (status < 0) {
 246                 mlog_errno(status);
 247                 goto leave;
 248         }
 249
 250         prev_clusters = le32_to_cpu(xv->xr_clusters);
 251         status = ocfs2_add_clusters_in_btree(osb,
 252                                              inode,
 253                                              &logical_start,
 254                                              clusters_to_add,
 255                                              0,
 256                                              &et,
 257                                              handle,
 258                                              data_ac,
 259                                              meta_ac,
 260                                              &why);
 261         if ((status < 0) && (status != -EAGAIN)) {
 262                 if (status != -ENOSPC)
 263                         mlog_errno(status);
 264                 goto leave;
 265         }
 266
 267         status = ocfs2_journal_dirty(handle, xattr_bh);
 268         if (status < 0) {
 269                 mlog_errno(status);
 270                 goto leave;
 271         }
 272
 273         clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
 274
 275         if (why != RESTART_NONE && clusters_to_add) {
 276                 if (why == RESTART_META) {
 277                         mlog(0, "restarting function.\n");
 278                         restart_func = 1;
 279                 } else {
 280                         BUG_ON(why != RESTART_TRANS);
 281
 282                         mlog(0, "restarting transaction.\n");
 283                         /* TODO: This can be more intelligent. */
 284                         credits = ocfs2_calc_extend_credits(osb->sb,
 285                                                             et.et_root_el,
 286                                                             clusters_to_add);
 287                         status = ocfs2_extend_trans(handle, credits);
 288                         if (status < 0) {
 289                                 /* handle still has to be committed at
 290                                  * this point. */
 291                                 status = -ENOMEM;
 292                                 mlog_errno(status);
 293                                 goto leave;
 294                         }
 295                         goto restarted_transaction;
 296                 }
 297         }
 298
 299 leave:
 300         if (handle) {
 301                 ocfs2_commit_trans(osb, handle);
 302                 handle = NULL;
 303         }
 304         if (data_ac) {
 305                 ocfs2_free_alloc_context(data_ac);
 306                 data_ac = NULL;
 307         }
 308         if (meta_ac) {
 309                 ocfs2_free_alloc_context(meta_ac);
 310                 meta_ac = NULL;
 311         }
 312         if ((!status) && restart_func) {
 313                 restart_func = 0;
 314                 goto restart_all;
 315         }
 316
 317         return status;
 318 }
 319
 320 static int __ocfs2_remove_xattr_range(struct inode *inode,
 321                                       struct buffer_head *root_bh,
 322                                       struct ocfs2_xattr_value_root *xv,
 323                                       u32 cpos, u32 phys_cpos, u32 len,
 324                                       struct ocfs2_cached_dealloc_ctxt *dealloc)
 325 {
 326         int ret;
 327         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 328         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 329         struct inode *tl_inode = osb->osb_tl_inode;
 330         handle_t *handle;
 331         struct ocfs2_alloc_context *meta_ac = NULL;
 332         struct ocfs2_extent_tree et;
 333
 334         ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
 335
 336         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
 337         if (ret) {
 338                 mlog_errno(ret);
 339                 return ret;
 340         }
 341
 342         mutex_lock(&tl_inode->i_mutex);
 343
 344         if (ocfs2_truncate_log_needs_flush(osb)) {
 345                 ret = __ocfs2_flush_truncate_log(osb);
 346                 if (ret < 0) {
 347                         mlog_errno(ret);
 348                         goto out;
 349                 }
 350         }
 351
 352         handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
 353         if (IS_ERR(handle)) {
 354                 ret = PTR_ERR(handle);
 355                 mlog_errno(ret);
 356                 goto out;
 357         }
 358
 359         ret = ocfs2_journal_access(handle, inode, root_bh,
 360                                    OCFS2_JOURNAL_ACCESS_WRITE);
 361         if (ret) {
 362                 mlog_errno(ret);
 363                 goto out_commit;
 364         }
 365
 366         ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
 367                                   dealloc);
 368         if (ret) {
 369                 mlog_errno(ret);
 370                 goto out_commit;
 371         }
 372
 373         le32_add_cpu(&xv->xr_clusters, -len);
 374
 375         ret = ocfs2_journal_dirty(handle, root_bh);
 376         if (ret) {
 377                 mlog_errno(ret);
 378                 goto out_commit;
 379         }
 380
 381         ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
 382         if (ret)
 383                 mlog_errno(ret);
 384
 385 out_commit:
 386         ocfs2_commit_trans(osb, handle);
 387 out:
 388         mutex_unlock(&tl_inode->i_mutex);
 389
 390         if (meta_ac)
 391                 ocfs2_free_alloc_context(meta_ac);
 392
 393         return ret;
 394 }
 395
 396 static int ocfs2_xattr_shrink_size(struct inode *inode,
 397                                    u32 old_clusters,
 398                                    u32 new_clusters,
 399                                    struct buffer_head *root_bh,
 400                                    struct ocfs2_xattr_value_root *xv)
 401 {
 402         int ret = 0;
 403         u32 trunc_len, cpos, phys_cpos, alloc_size;
 404         u64 block;
 405         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 406         struct ocfs2_cached_dealloc_ctxt dealloc;
 407
 408         ocfs2_init_dealloc_ctxt(&dealloc);
 409
 410         if (old_clusters <= new_clusters)
 411                 return 0;
 412
 413         cpos = new_clusters;
 414         trunc_len = old_clusters - new_clusters;
 415         while (trunc_len) {
 416                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
 417                                                &alloc_size, &xv->xr_list);
 418                 if (ret) {
 419                         mlog_errno(ret);
 420                         goto out;
 421                 }
 422
 423                 if (alloc_size > trunc_len)
 424                         alloc_size = trunc_len;
 425
 426                 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
 427                                                  phys_cpos, alloc_size,
 428                                                  &dealloc);
 429                 if (ret) {
 430                         mlog_errno(ret);
 431                         goto out;
 432                 }
 433
 434                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 435                 ocfs2_remove_xattr_clusters_from_cache(inode, block,
 436                                                        alloc_size);
 437                 cpos += alloc_size;
 438                 trunc_len -= alloc_size;
 439         }
 440
 441 out:
 442         ocfs2_schedule_truncate_log_flush(osb, 1);
 443         ocfs2_run_deallocs(osb, &dealloc);
 444
 445         return ret;
 446 }
 447
 448 static int ocfs2_xattr_value_truncate(struct inode *inode,
 449                                       struct buffer_head *root_bh,
 450                                       struct ocfs2_xattr_value_root *xv,
 451                                       int len)
 452 {
 453         int ret;
 454         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
 455         u32 old_clusters = le32_to_cpu(xv->xr_clusters);
 456
 457         if (new_clusters == old_clusters)
 458                 return 0;
 459
 460         if (new_clusters > old_clusters)
 461                 ret = ocfs2_xattr_extend_allocation(inode,
 462                                                     new_clusters - old_clusters,
 463                                                     root_bh, xv);
 464         else
 465                 ret = ocfs2_xattr_shrink_size(inode,
 466                                               old_clusters, new_clusters,
 467                                               root_bh, xv);
 468
 469         return ret;
 470 }
 471
 472 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
 473                                   size_t *result, const char *prefix,
 474                                   const char *name, int name_len)
 475 {
 476         char *p = buffer + *result;
 477         int prefix_len = strlen(prefix);
 478         int total_len = prefix_len + name_len + 1;
 479
 480         *result += total_len;
 481
 482         /* we are just looking for how big our buffer needs to be */
 483         if (!size)
 484                 return 0;
 485
 486         if (*result > size)
 487                 return -ERANGE;
 488
 489         memcpy(p, prefix, prefix_len);
 490         memcpy(p + prefix_len, name, name_len);
 491         p[prefix_len + name_len] = '\0';
 492
 493         return 0;
 494 }
 495
 496 static int ocfs2_xattr_list_entries(struct inode *inode,
 497                                     struct ocfs2_xattr_header *header,
 498                                     char *buffer, size_t buffer_size)
 499 {
 500         size_t result = 0;
 501         int i, type, ret;
 502         const char *prefix, *name;
 503
 504         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
 505                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 506                 type = ocfs2_xattr_get_type(entry);
 507                 prefix = ocfs2_xattr_prefix(type);
 508
 509                 if (prefix) {
 510                         name = (const char *)header +
 511                                 le16_to_cpu(entry->xe_name_offset);
 512
 513                         ret = ocfs2_xattr_list_entry(buffer, buffer_size,
 514                                                      &result, prefix, name,
 515                                                      entry->xe_name_len);
 516                         if (ret)
 517                                 return ret;
 518                 }
 519         }
 520
 521         return result;
 522 }
 523
 524 static int ocfs2_xattr_ibody_list(struct inode *inode,
 525                                   struct ocfs2_dinode *di,
 526                                   char *buffer,
 527                                   size_t buffer_size)
 528 {
 529         struct ocfs2_xattr_header *header = NULL;
 530         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 531         int ret = 0;
 532
 533         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 534                 return ret;
 535
 536         header = (struct ocfs2_xattr_header *)
 537                  ((void *)di + inode->i_sb->s_blocksize -
 538                  le16_to_cpu(di->i_xattr_inline_size));
 539
 540         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
 541
 542         return ret;
 543 }
 544
 545 static int ocfs2_xattr_block_list(struct inode *inode,
 546                                   struct ocfs2_dinode *di,
 547                                   char *buffer,
 548                                   size_t buffer_size)
 549 {
 550         struct buffer_head *blk_bh = NULL;
 551         struct ocfs2_xattr_block *xb;
 552         int ret = 0;
 553
 554         if (!di->i_xattr_loc)
 555                 return ret;
 556
 557         ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
 558         if (ret < 0) {
 559                 mlog_errno(ret);
 560                 return ret;
 561         }
 562
 563         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 564         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
 565                 ret = -EIO;
 566                 goto cleanup;
 567         }
 568
 569         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 570                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
 571                 ret = ocfs2_xattr_list_entries(inode, header,
 572                                                buffer, buffer_size);
 573         } else {
 574                 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
 575                 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
 576                                                    buffer, buffer_size);
 577         }
 578 cleanup:
 579         brelse(blk_bh);
 580
 581         return ret;
 582 }
 583
 584 ssize_t ocfs2_listxattr(struct dentry *dentry,
 585                         char *buffer,
 586                         size_t size)
 587 {
 588         int ret = 0, i_ret = 0, b_ret = 0;
 589         struct buffer_head *di_bh = NULL;
 590         struct ocfs2_dinode *di = NULL;
 591         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
 592
 593         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
 594                 return -EOPNOTSUPP;
 595
 596         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 597                 return ret;
 598
 599         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
 600         if (ret < 0) {
 601                 mlog_errno(ret);
 602                 return ret;
 603         }
 604
 605         di = (struct ocfs2_dinode *)di_bh->b_data;
 606
 607         down_read(&oi->ip_xattr_sem);
 608         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
 609         if (i_ret < 0)
 610                 b_ret = 0;
 611         else {
 612                 if (buffer) {
 613                         buffer += i_ret;
 614                         size -= i_ret;
 615                 }
 616                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
 617                                                buffer, size);
 618                 if (b_ret < 0)
 619                         i_ret = 0;
 620         }
 621         up_read(&oi->ip_xattr_sem);
 622         ocfs2_inode_unlock(dentry->d_inode, 0);
 623
 624         brelse(di_bh);
 625
 626         return i_ret + b_ret;
 627 }
 628
 629 static int ocfs2_xattr_find_entry(int name_index,
 630                                   const char *name,
 631                                   struct ocfs2_xattr_search *xs)
 632 {
 633         struct ocfs2_xattr_entry *entry;
 634         size_t name_len;
 635         int i, cmp = 1;
 636
 637         if (name == NULL)
 638                 return -EINVAL;
 639
 640         name_len = strlen(name);
 641         entry = xs->here;
 642         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
 643                 cmp = name_index - ocfs2_xattr_get_type(entry);
 644                 if (!cmp)
 645                         cmp = name_len - entry->xe_name_len;
 646                 if (!cmp)
 647                         cmp = memcmp(name, (xs->base +
 648                                      le16_to_cpu(entry->xe_name_offset)),
 649                                      name_len);
 650                 if (cmp == 0)
 651                         break;
 652                 entry += 1;
 653         }
 654         xs->here = entry;
 655
 656         return cmp ? -ENODATA : 0;
 657 }
 658
 659 static int ocfs2_xattr_get_value_outside(struct inode *inode,
 660                                          struct ocfs2_xattr_value_root *xv,
 661                                          void *buffer,
 662                                          size_t len)
 663 {
 664         u32 cpos, p_cluster, num_clusters, bpc, clusters;
 665         u64 blkno;
 666         int i, ret = 0;
 667         size_t cplen, blocksize;
 668         struct buffer_head *bh = NULL;
 669         struct ocfs2_extent_list *el;
 670
 671         el = &xv->xr_list;
 672         clusters = le32_to_cpu(xv->xr_clusters);
 673         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 674         blocksize = inode->i_sb->s_blocksize;
 675
 676         cpos = 0;
 677         while (cpos < clusters) {
 678                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 679                                                &num_clusters, el);
 680                 if (ret) {
 681                         mlog_errno(ret);
 682                         goto out;
 683                 }
 684
 685                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 686                 /* Copy ocfs2_xattr_value */
 687                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
 688                         ret = ocfs2_read_block(inode, blkno, &bh);
 689                         if (ret) {
 690                                 mlog_errno(ret);
 691                                 goto out;
 692                         }
 693
 694                         cplen = len >= blocksize ? blocksize : len;
 695                         memcpy(buffer, bh->b_data, cplen);
 696                         len -= cplen;
 697                         buffer += cplen;
 698
 699                         brelse(bh);
 700                         bh = NULL;
 701                         if (len == 0)
 702                                 break;
 703                 }
 704                 cpos += num_clusters;
 705         }
 706 out:
 707         return ret;
 708 }
 709
 710 static int ocfs2_xattr_ibody_get(struct inode *inode,
 711                                  int name_index,
 712                                  const char *name,
 713                                  void *buffer,
 714                                  size_t buffer_size,
 715                                  struct ocfs2_xattr_search *xs)
 716 {
 717         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 718         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
 719         struct ocfs2_xattr_value_root *xv;
 720         size_t size;
 721         int ret = 0;
 722
 723         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 724                 return -ENODATA;
 725
 726         xs->end = (void *)di + inode->i_sb->s_blocksize;
 727         xs->header = (struct ocfs2_xattr_header *)
 728                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
 729         xs->base = (void *)xs->header;
 730         xs->here = xs->header->xh_entries;
 731
 732         ret = ocfs2_xattr_find_entry(name_index, name, xs);
 733         if (ret)
 734                 return ret;
 735         size = le64_to_cpu(xs->here->xe_value_size);
 736         if (buffer) {
 737                 if (size > buffer_size)
 738                         return -ERANGE;
 739                 if (ocfs2_xattr_is_local(xs->here)) {
 740                         memcpy(buffer, (void *)xs->base +
 741                                le16_to_cpu(xs->here->xe_name_offset) +
 742                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
 743                 } else {
 744                         xv = (struct ocfs2_xattr_value_root *)
 745                                 (xs->base + le16_to_cpu(
 746                                  xs->here->xe_name_offset) +
 747                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
 748                         ret = ocfs2_xattr_get_value_outside(inode, xv,
 749                                                             buffer, size);
 750                         if (ret < 0) {
 751                                 mlog_errno(ret);
 752                                 return ret;
 753                         }
 754                 }
 755         }
 756
 757         return size;
 758 }
 759
 760 static int ocfs2_xattr_block_get(struct inode *inode,
 761                                  int name_index,
 762                                  const char *name,
 763                                  void *buffer,
 764                                  size_t buffer_size,
 765                                  struct ocfs2_xattr_search *xs)
 766 {
 767         struct ocfs2_xattr_block *xb;
 768         struct ocfs2_xattr_value_root *xv;
 769         size_t size;
 770         int ret = -ENODATA, name_offset, name_len, block_off, i;
 771
 772         memset(&xs->bucket, 0, sizeof(xs->bucket));
 773
 774         ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
 775         if (ret) {
 776                 mlog_errno(ret);
 777                 goto cleanup;
 778         }
 779
 780         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
 781         size = le64_to_cpu(xs->here->xe_value_size);
 782         if (buffer) {
 783                 ret = -ERANGE;
 784                 if (size > buffer_size)
 785                         goto cleanup;
 786
 787                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
 788                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
 789                 i = xs->here - xs->header->xh_entries;
 790
 791                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
 792                         ret = ocfs2_xattr_bucket_get_name_value(inode,
 793                                                                 xs->bucket.xh,
 794                                                                 i,
 795                                                                 &block_off,
 796                                                                 &name_offset);
 797                         xs->base = xs->bucket.bhs[block_off]->b_data;
 798                 }
 799                 if (ocfs2_xattr_is_local(xs->here)) {
 800                         memcpy(buffer, (void *)xs->base +
 801                                name_offset + name_len, size);
 802                 } else {
 803                         xv = (struct ocfs2_xattr_value_root *)
 804                                 (xs->base + name_offset + name_len);
 805                         ret = ocfs2_xattr_get_value_outside(inode, xv,
 806                                                             buffer, size);
 807                         if (ret < 0) {
 808                                 mlog_errno(ret);
 809                                 goto cleanup;
 810                         }
 811                 }
 812         }
 813         ret = size;
 814 cleanup:
 815         for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
 816                 brelse(xs->bucket.bhs[i]);
 817         memset(&xs->bucket, 0, sizeof(xs->bucket));
 818
 819         brelse(xs->xattr_bh);
 820         xs->xattr_bh = NULL;
 821         return ret;
 822 }
 823
 824 /* ocfs2_xattr_get()
 825  *
 826  * Copy an extended attribute into the buffer provided.
 827  * Buffer is NULL to compute the size of buffer required.
 828  */
 829 static int ocfs2_xattr_get(struct inode *inode,
 830                            int name_index,
 831                            const char *name,
 832                            void *buffer,
 833                            size_t buffer_size)
 834 {
 835         int ret;
 836         struct ocfs2_dinode *di = NULL;
 837         struct buffer_head *di_bh = NULL;
 838         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 839         struct ocfs2_xattr_search xis = {
 840                 .not_found = -ENODATA,
 841         };
 842         struct ocfs2_xattr_search xbs = {
 843                 .not_found = -ENODATA,
 844         };
 845
 846         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
 847                 return -EOPNOTSUPP;
 848
 849         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 850                 ret = -ENODATA;
 851
 852         ret = ocfs2_inode_lock(inode, &di_bh, 0);
 853         if (ret < 0) {
 854                 mlog_errno(ret);
 855                 return ret;
 856         }
 857         xis.inode_bh = xbs.inode_bh = di_bh;
 858         di = (struct ocfs2_dinode *)di_bh->b_data;
 859
 860         down_read(&oi->ip_xattr_sem);
 861         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
 862                                     buffer_size, &xis);
 863         if (ret == -ENODATA)
 864                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
 865                                             buffer_size, &xbs);
 866         up_read(&oi->ip_xattr_sem);
 867         ocfs2_inode_unlock(inode, 0);
 868
 869         brelse(di_bh);
 870
 871         return ret;
 872 }
 873
 874 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
 875                                            struct ocfs2_xattr_value_root *xv,
 876                                            const void *value,
 877                                            int value_len)
 878 {
 879         int ret = 0, i, cp_len, credits;
 880         u16 blocksize = inode->i_sb->s_blocksize;
 881         u32 p_cluster, num_clusters;
 882         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 883         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
 884         u64 blkno;
 885         struct buffer_head *bh = NULL;
 886         handle_t *handle;
 887
 888         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
 889
 890         credits = clusters * bpc;
 891         handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
 892         if (IS_ERR(handle)) {
 893                 ret = PTR_ERR(handle);
 894                 mlog_errno(ret);
 895                 goto out;
 896         }
 897
 898         while (cpos < clusters) {
 899                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 900                                                &num_clusters, &xv->xr_list);
 901                 if (ret) {
 902                         mlog_errno(ret);
 903                         goto out_commit;
 904                 }
 905
 906                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 907
 908                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
 909                         ret = ocfs2_read_block(inode, blkno, &bh);
 910                         if (ret) {
 911                                 mlog_errno(ret);
 912                                 goto out_commit;
 913                         }
 914
 915                         ret = ocfs2_journal_access(handle,
 916                                                    inode,
 917                                                    bh,
 918                                                    OCFS2_JOURNAL_ACCESS_WRITE);
 919                         if (ret < 0) {
 920                                 mlog_errno(ret);
 921                                 goto out_commit;
 922                         }
 923
 924                         cp_len = value_len > blocksize ? blocksize : value_len;
 925                         memcpy(bh->b_data, value, cp_len);
 926                         value_len -= cp_len;
 927                         value += cp_len;
 928                         if (cp_len < blocksize)
 929                                 memset(bh->b_data + cp_len, 0,
 930                                        blocksize - cp_len);
 931
 932                         ret = ocfs2_journal_dirty(handle, bh);
 933                         if (ret < 0) {
 934                                 mlog_errno(ret);
 935                                 goto out_commit;
 936                         }
 937                         brelse(bh);
 938                         bh = NULL;
 939
 940                         /*
 941                          * XXX: do we need to empty all the following
 942                          * blocks in this cluster?
 943                          */
 944                         if (!value_len)
 945                                 break;
 946                 }
 947                 cpos += num_clusters;
 948         }
 949 out_commit:
 950         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 951 out:
 952         brelse(bh);
 953
 954         return ret;
 955 }
 956
 957 static int ocfs2_xattr_cleanup(struct inode *inode,
 958                                struct ocfs2_xattr_info *xi,
 959                                struct ocfs2_xattr_search *xs,
 960                                size_t offs)
 961 {
 962         handle_t *handle = NULL;
 963         int ret = 0;
 964         size_t name_len = strlen(xi->name);
 965         void *val = xs->base + offs;
 966         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 967
 968         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
 969                                    OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
 970         if (IS_ERR(handle)) {
 971                 ret = PTR_ERR(handle);
 972                 mlog_errno(ret);
 973                 goto out;
 974         }
 975         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
 976                                    OCFS2_JOURNAL_ACCESS_WRITE);
 977         if (ret) {
 978                 mlog_errno(ret);
 979                 goto out_commit;
 980         }
 981         /* Decrease xattr count */
 982         le16_add_cpu(&xs->header->xh_count, -1);
 983         /* Remove the xattr entry and tree root which has already be set*/
 984         memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
 985         memset(val, 0, size);
 986
 987         ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
 988         if (ret < 0)
 989                 mlog_errno(ret);
 990 out_commit:
 991         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 992 out:
 993         return ret;
 994 }
 995
 996 static int ocfs2_xattr_update_entry(struct inode *inode,
 997                                     struct ocfs2_xattr_info *xi,
 998                                     struct ocfs2_xattr_search *xs,
 999                                     size_t offs)
1000 {
1001         handle_t *handle = NULL;
1002         int ret = 0;
1003
1004         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1005                                    OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1006         if (IS_ERR(handle)) {
1007                 ret = PTR_ERR(handle);
1008                 mlog_errno(ret);
1009                 goto out;
1010         }
1011         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1012                                    OCFS2_JOURNAL_ACCESS_WRITE);
1013         if (ret) {
1014                 mlog_errno(ret);
1015                 goto out_commit;
1016         }
1017
1018         xs->here->xe_name_offset = cpu_to_le16(offs);
1019         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1020         if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1021                 ocfs2_xattr_set_local(xs->here, 1);
1022         else
1023                 ocfs2_xattr_set_local(xs->here, 0);
1024         ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1025
1026         ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1027         if (ret < 0)
1028                 mlog_errno(ret);
1029 out_commit:
1030         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1031 out:
1032         return ret;
1033 }
1034
1035 /*
1036  * ocfs2_xattr_set_value_outside()
1037  *
1038  * Set large size value in B tree.
1039  */
1040 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1041                                          struct ocfs2_xattr_info *xi,
1042                                          struct ocfs2_xattr_search *xs,
1043                                          size_t offs)
1044 {
1045         size_t name_len = strlen(xi->name);
1046         void *val = xs->base + offs;
1047         struct ocfs2_xattr_value_root *xv = NULL;
1048         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1049         int ret = 0;
1050
1051         memset(val, 0, size);
1052         memcpy(val, xi->name, name_len);
1053         xv = (struct ocfs2_xattr_value_root *)
1054                 (val + OCFS2_XATTR_SIZE(name_len));
1055         xv->xr_clusters = 0;
1056         xv->xr_last_eb_blk = 0;
1057         xv->xr_list.l_tree_depth = 0;
1058         xv->xr_list.l_count = cpu_to_le16(1);
1059         xv->xr_list.l_next_free_rec = 0;
1060
1061         ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
1062                                          xi->value_len);
1063         if (ret < 0) {
1064                 mlog_errno(ret);
1065                 return ret;
1066         }
1067         ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
1068                                               xi->value_len);
1069         if (ret < 0) {
1070                 mlog_errno(ret);
1071                 return ret;
1072         }
1073         ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
1074         if (ret < 0)
1075                 mlog_errno(ret);
1076
1077         return ret;
1078 }
1079
1080 /*
1081  * ocfs2_xattr_set_entry_local()
1082  *
1083  * Set, replace or remove extended attribute in local.
1084  */
1085 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1086                                         struct ocfs2_xattr_info *xi,
1087                                         struct ocfs2_xattr_search *xs,
1088                                         struct ocfs2_xattr_entry *last,
1089                                         size_t min_offs)
1090 {
1091         size_t name_len = strlen(xi->name);
1092         int i;
1093
1094         if (xi->value && xs->not_found) {
1095                 /* Insert the new xattr entry. */
1096                 le16_add_cpu(&xs->header->xh_count, 1);
1097                 ocfs2_xattr_set_type(last, xi->name_index);
1098                 ocfs2_xattr_set_local(last, 1);
1099                 last->xe_name_len = name_len;
1100         } else {
1101                 void *first_val;
1102                 void *val;
1103                 size_t offs, size;
1104
1105                 first_val = xs->base + min_offs;
1106                 offs = le16_to_cpu(xs->here->xe_name_offset);
1107                 val = xs->base + offs;
1108
1109                 if (le64_to_cpu(xs->here->xe_value_size) >
1110                     OCFS2_XATTR_INLINE_SIZE)
1111                         size = OCFS2_XATTR_SIZE(name_len) +
1112                                 OCFS2_XATTR_ROOT_SIZE;
1113                 else
1114                         size = OCFS2_XATTR_SIZE(name_len) +
1115                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1116
1117                 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1118                                 OCFS2_XATTR_SIZE(xi->value_len)) {
1119                         /* The old and the new value have the
1120                            same size. Just replace the value. */
1121                         ocfs2_xattr_set_local(xs->here, 1);
1122                         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1123                         /* Clear value bytes. */
1124                         memset(val + OCFS2_XATTR_SIZE(name_len),
1125                                0,
1126                                OCFS2_XATTR_SIZE(xi->value_len));
1127                         memcpy(val + OCFS2_XATTR_SIZE(name_len),
1128                                xi->value,
1129                                xi->value_len);
1130                         return;
1131                 }
1132                 /* Remove the old name+value. */
1133                 memmove(first_val + size, first_val, val - first_val);
1134                 memset(first_val, 0, size);
1135                 xs->here->xe_name_hash = 0;
1136                 xs->here->xe_name_offset = 0;
1137                 ocfs2_xattr_set_local(xs->here, 1);
1138                 xs->here->xe_value_size = 0;
1139
1140                 min_offs += size;
1141
1142                 /* Adjust all value offsets. */
1143                 last = xs->header->xh_entries;
1144                 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1145                         size_t o = le16_to_cpu(last->xe_name_offset);
1146
1147                         if (o < offs)
1148                                 last->xe_name_offset = cpu_to_le16(o + size);
1149                         last += 1;
1150                 }
1151
1152                 if (!xi->value) {
1153                         /* Remove the old entry. */
1154                         last -= 1;
1155                         memmove(xs->here, xs->here + 1,
1156                                 (void *)last - (void *)xs->here);
1157                         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1158                         le16_add_cpu(&xs->header->xh_count, -1);
1159                 }
1160         }
1161         if (xi->value) {
1162                 /* Insert the new name+value. */
1163                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1164                                 OCFS2_XATTR_SIZE(xi->value_len);
1165                 void *val = xs->base + min_offs - size;
1166
1167                 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1168                 memset(val, 0, size);
1169                 memcpy(val, xi->name, name_len);
1170                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1171                        xi->value,
1172                        xi->value_len);
1173                 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1174                 ocfs2_xattr_set_local(xs->here, 1);
1175                 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1176         }
1177
1178         return;
1179 }
1180
1181 /*
1182  * ocfs2_xattr_set_entry()
1183  *
1184  * Set extended attribute entry into inode or block.
1185  *
1186  * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1187  * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1188  * then set value in B tree with set_value_outside().
1189  */
1190 static int ocfs2_xattr_set_entry(struct inode *inode,
1191                                  struct ocfs2_xattr_info *xi,
1192                                  struct ocfs2_xattr_search *xs,
1193                                  int flag)
1194 {
1195         struct ocfs2_xattr_entry *last;
1196         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1197         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1198         size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1199         size_t size_l = 0;
1200         handle_t *handle = NULL;
1201         int free, i, ret;
1202         struct ocfs2_xattr_info xi_l = {
1203                 .name_index = xi->name_index,
1204                 .name = xi->name,
1205                 .value = xi->value,
1206                 .value_len = xi->value_len,
1207         };
1208
1209         /* Compute min_offs, last and free space. */
1210         last = xs->header->xh_entries;
1211
1212         for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1213                 size_t offs = le16_to_cpu(last->xe_name_offset);
1214                 if (offs < min_offs)
1215                         min_offs = offs;
1216                 last += 1;
1217         }
1218
1219         free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
1220         if (free < 0)
1221                 return -EIO;
1222
1223         if (!xs->not_found) {
1224                 size_t size = 0;
1225                 if (ocfs2_xattr_is_local(xs->here))
1226                         size = OCFS2_XATTR_SIZE(name_len) +
1227                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1228                 else
1229                         size = OCFS2_XATTR_SIZE(name_len) +
1230                                 OCFS2_XATTR_ROOT_SIZE;
1231                 free += (size + sizeof(struct ocfs2_xattr_entry));
1232         }
1233         /* Check free space in inode or block */
1234         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1235                 if (free < sizeof(struct ocfs2_xattr_entry) +
1236                            OCFS2_XATTR_SIZE(name_len) +
1237                            OCFS2_XATTR_ROOT_SIZE) {
1238                         ret = -ENOSPC;
1239                         goto out;
1240                 }
1241                 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1242                 xi_l.value = (void *)&def_xv;
1243                 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1244         } else if (xi->value) {
1245                 if (free < sizeof(struct ocfs2_xattr_entry) +
1246                            OCFS2_XATTR_SIZE(name_len) +
1247                            OCFS2_XATTR_SIZE(xi->value_len)) {
1248                         ret = -ENOSPC;
1249                         goto out;
1250                 }
1251         }
1252
1253         if (!xs->not_found) {
1254                 /* For existing extended attribute */
1255                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1256                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1257                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1258                 void *val = xs->base + offs;
1259
1260                 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1261                         /* Replace existing local xattr with tree root */
1262                         ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1263                                                             offs);
1264                         if (ret < 0)
1265                                 mlog_errno(ret);
1266                         goto out;
1267                 } else if (!ocfs2_xattr_is_local(xs->here)) {
1268                         /* For existing xattr which has value outside */
1269                         struct ocfs2_xattr_value_root *xv = NULL;
1270                         xv = (struct ocfs2_xattr_value_root *)(val +
1271                                 OCFS2_XATTR_SIZE(name_len));
1272
1273                         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1274                                 /*
1275                                  * If new value need set outside also,
1276                                  * first truncate old value to new value,
1277                                  * then set new value with set_value_outside().
1278                                  */
1279                                 ret = ocfs2_xattr_value_truncate(inode,
1280                                                                  xs->xattr_bh,
1281                                                                  xv,
1282                                                                  xi->value_len);
1283                                 if (ret < 0) {
1284                                         mlog_errno(ret);
1285                                         goto out;
1286                                 }
1287
1288                                 ret = __ocfs2_xattr_set_value_outside(inode,
1289                                                                 xv,
1290                                                                 xi->value,
1291                                                                 xi->value_len);
1292                                 if (ret < 0) {
1293                                         mlog_errno(ret);
1294                                         goto out;
1295                                 }
1296
1297                                 ret = ocfs2_xattr_update_entry(inode,
1298                                                                xi,
1299                                                                xs,
1300                                                                offs);
1301                                 if (ret < 0)
1302                                         mlog_errno(ret);
1303                                 goto out;
1304                         } else {
1305                                 /*
1306                                  * If new value need set in local,
1307                                  * just trucate old value to zero.
1308                                  */
1309                                  ret = ocfs2_xattr_value_truncate(inode,
1310                                                                  xs->xattr_bh,
1311                                                                  xv,
1312                                                                  0);
1313                                 if (ret < 0)
1314                                         mlog_errno(ret);
1315                         }
1316                 }
1317         }
1318
1319         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1320                                    OCFS2_INODE_UPDATE_CREDITS);
1321         if (IS_ERR(handle)) {
1322                 ret = PTR_ERR(handle);
1323                 mlog_errno(ret);
1324                 goto out;
1325         }
1326
1327         ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1328                                    OCFS2_JOURNAL_ACCESS_WRITE);
1329         if (ret) {
1330                 mlog_errno(ret);
1331                 goto out_commit;
1332         }
1333
1334         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1335                 /* set extended attribute in external block. */
1336                 ret = ocfs2_extend_trans(handle,
1337                                          OCFS2_INODE_UPDATE_CREDITS +
1338                                          OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1339                 if (ret) {
1340                         mlog_errno(ret);
1341                         goto out_commit;
1342                 }
1343                 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1344                                            OCFS2_JOURNAL_ACCESS_WRITE);
1345                 if (ret) {
1346                         mlog_errno(ret);
1347                         goto out_commit;
1348                 }
1349         }
1350
1351         /*
1352          * Set value in local, include set tree root in local.
1353          * This is the first step for value size >INLINE_SIZE.
1354          */
1355         ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1356
1357         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1358                 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1359                 if (ret < 0) {
1360                         mlog_errno(ret);
1361                         goto out_commit;
1362                 }
1363         }
1364
1365         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1366             (flag & OCFS2_INLINE_XATTR_FL)) {
1367                 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1368                 unsigned int xattrsize = osb->s_xattr_inline_size;
1369
1370                 /*
1371                  * Adjust extent record count or inline data size
1372                  * to reserve space for extended attribute.
1373                  */
1374                 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1375                         struct ocfs2_inline_data *idata = &di->id2.i_data;
1376                         le16_add_cpu(&idata->id_count, -xattrsize);
1377                 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1378                         struct ocfs2_extent_list *el = &di->id2.i_list;
1379                         le16_add_cpu(&el->l_count, -(xattrsize /
1380                                         sizeof(struct ocfs2_extent_rec)));
1381                 }
1382                 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1383         }
1384         /* Update xattr flag */
1385         spin_lock(&oi->ip_lock);
1386         oi->ip_dyn_features |= flag;
1387         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1388         spin_unlock(&oi->ip_lock);
1389         /* Update inode ctime */
1390         inode->i_ctime = CURRENT_TIME;
1391         di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1392         di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1393
1394         ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1395         if (ret < 0)
1396                 mlog_errno(ret);
1397
1398 out_commit:
1399         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1400
1401         if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1402                 /*
1403                  * Set value outside in B tree.
1404                  * This is the second step for value size > INLINE_SIZE.
1405                  */
1406                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1407                 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
1408                 if (ret < 0) {
1409                         int ret2;
1410
1411                         mlog_errno(ret);
1412                         /*
1413                          * If set value outside failed, we have to clean
1414                          * the junk tree root we have already set in local.
1415                          */
1416                         ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
1417                         if (ret2 < 0)
1418                                 mlog_errno(ret2);
1419                 }
1420         }
1421 out:
1422         return ret;
1423
1424 }
1425
1426 static int ocfs2_remove_value_outside(struct inode*inode,
1427                                       struct buffer_head *bh,
1428                                       struct ocfs2_xattr_header *header)
1429 {
1430         int ret = 0, i;
1431
1432         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1433                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1434
1435                 if (!ocfs2_xattr_is_local(entry)) {
1436                         struct ocfs2_xattr_value_root *xv;
1437                         void *val;
1438
1439                         val = (void *)header +
1440                                 le16_to_cpu(entry->xe_name_offset);
1441                         xv = (struct ocfs2_xattr_value_root *)
1442                                 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1443                         ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
1444                         if (ret < 0) {
1445                                 mlog_errno(ret);
1446                                 return ret;
1447                         }
1448                 }
1449         }
1450
1451         return ret;
1452 }
1453
1454 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1455                                     struct buffer_head *di_bh)
1456 {
1457
1458         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1459         struct ocfs2_xattr_header *header;
1460         int ret;
1461
1462         header = (struct ocfs2_xattr_header *)
1463                  ((void *)di + inode->i_sb->s_blocksize -
1464                  le16_to_cpu(di->i_xattr_inline_size));
1465
1466         ret = ocfs2_remove_value_outside(inode, di_bh, header);
1467
1468         return ret;
1469 }
1470
1471 static int ocfs2_xattr_block_remove(struct inode *inode,
1472                                     struct buffer_head *blk_bh)
1473 {
1474         struct ocfs2_xattr_block *xb;
1475         int ret = 0;
1476
1477         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1478         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1479                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1480                 ret = ocfs2_remove_value_outside(inode, blk_bh, header);
1481         } else
1482                 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
1483
1484         return ret;
1485 }
1486
1487 static int ocfs2_xattr_free_block(struct inode *inode,
1488                                   u64 block)
1489 {
1490         struct inode *xb_alloc_inode;
1491         struct buffer_head *xb_alloc_bh = NULL;
1492         struct buffer_head *blk_bh = NULL;
1493         struct ocfs2_xattr_block *xb;
1494         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1495         handle_t *handle;
1496         int ret = 0;
1497         u64 blk, bg_blkno;
1498         u16 bit;
1499
1500         ret = ocfs2_read_block(inode, block, &blk_bh);
1501         if (ret < 0) {
1502                 mlog_errno(ret);
1503                 goto out;
1504         }
1505
1506         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1507         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
1508                 ret = -EIO;
1509                 goto out;
1510         }
1511
1512         ret = ocfs2_xattr_block_remove(inode, blk_bh);
1513         if (ret < 0) {
1514                 mlog_errno(ret);
1515                 goto out;
1516         }
1517
1518         blk = le64_to_cpu(xb->xb_blkno);
1519         bit = le16_to_cpu(xb->xb_suballoc_bit);
1520         bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1521
1522         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1523                                 EXTENT_ALLOC_SYSTEM_INODE,
1524                                 le16_to_cpu(xb->xb_suballoc_slot));
1525         if (!xb_alloc_inode) {
1526                 ret = -ENOMEM;
1527                 mlog_errno(ret);
1528                 goto out;
1529         }
1530         mutex_lock(&xb_alloc_inode->i_mutex);
1531
1532         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1533         if (ret < 0) {
1534                 mlog_errno(ret);
1535                 goto out_mutex;
1536         }
1537
1538         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1539         if (IS_ERR(handle)) {
1540                 ret = PTR_ERR(handle);
1541                 mlog_errno(ret);
1542                 goto out_unlock;
1543         }
1544
1545         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1546                                        bit, bg_blkno, 1);
1547         if (ret < 0)
1548                 mlog_errno(ret);
1549
1550         ocfs2_commit_trans(osb, handle);
1551 out_unlock:
1552         ocfs2_inode_unlock(xb_alloc_inode, 1);
1553         brelse(xb_alloc_bh);
1554 out_mutex:
1555         mutex_unlock(&xb_alloc_inode->i_mutex);
1556         iput(xb_alloc_inode);
1557 out:
1558         brelse(blk_bh);
1559         return ret;
1560 }
1561
1562 /*
1563  * ocfs2_xattr_remove()
1564  *
1565  * Free extended attribute resources associated with this inode.
1566  */
1567 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1568 {
1569         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1570         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1571         handle_t *handle;
1572         int ret;
1573
1574         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1575                 return 0;
1576
1577         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1578                 return 0;
1579
1580         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1581                 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1582                 if (ret < 0) {
1583                         mlog_errno(ret);
1584                         goto out;
1585                 }
1586         }
1587
1588         if (di->i_xattr_loc) {
1589                 ret = ocfs2_xattr_free_block(inode,
1590                                              le64_to_cpu(di->i_xattr_loc));
1591                 if (ret < 0) {
1592                         mlog_errno(ret);
1593                         goto out;
1594                 }
1595         }
1596
1597         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1598                                    OCFS2_INODE_UPDATE_CREDITS);
1599         if (IS_ERR(handle)) {
1600                 ret = PTR_ERR(handle);
1601                 mlog_errno(ret);
1602                 goto out;
1603         }
1604         ret = ocfs2_journal_access(handle, inode, di_bh,
1605                                    OCFS2_JOURNAL_ACCESS_WRITE);
1606         if (ret) {
1607                 mlog_errno(ret);
1608                 goto out_commit;
1609         }
1610
1611         di->i_xattr_loc = 0;
1612
1613         spin_lock(&oi->ip_lock);
1614         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1615         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1616         spin_unlock(&oi->ip_lock);
1617
1618         ret = ocfs2_journal_dirty(handle, di_bh);
1619         if (ret < 0)
1620                 mlog_errno(ret);
1621 out_commit:
1622         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1623 out:
1624         return ret;
1625 }
1626
1627 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1628                                         struct ocfs2_dinode *di)
1629 {
1630         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1631         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1632         int free;
1633
1634         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1635                 return 0;
1636
1637         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1638                 struct ocfs2_inline_data *idata = &di->id2.i_data;
1639                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1640         } else if (ocfs2_inode_is_fast_symlink(inode)) {
1641                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1642                         le64_to_cpu(di->i_size);
1643         } else {
1644                 struct ocfs2_extent_list *el = &di->id2.i_list;
1645                 free = (le16_to_cpu(el->l_count) -
1646                         le16_to_cpu(el->l_next_free_rec)) *
1647                         sizeof(struct ocfs2_extent_rec);
1648         }
1649         if (free >= xattrsize)
1650                 return 1;
1651
1652         return 0;
1653 }
1654
1655 /*
1656  * ocfs2_xattr_ibody_find()
1657  *
1658  * Find extended attribute in inode block and
1659  * fill search info into struct ocfs2_xattr_search.
1660  */
1661 static int ocfs2_xattr_ibody_find(struct inode *inode,
1662                                   int name_index,
1663                                   const char *name,
1664                                   struct ocfs2_xattr_search *xs)
1665 {
1666         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1667         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1668         int ret;
1669         int has_space = 0;
1670
1671         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1672                 return 0;
1673
1674         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1675                 down_read(&oi->ip_alloc_sem);
1676                 has_space = ocfs2_xattr_has_space_inline(inode, di);
1677                 up_read(&oi->ip_alloc_sem);
1678                 if (!has_space)
1679                         return 0;
1680         }
1681
1682         xs->xattr_bh = xs->inode_bh;
1683         xs->end = (void *)di + inode->i_sb->s_blocksize;
1684         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1685                 xs->header = (struct ocfs2_xattr_header *)
1686                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1687         else
1688                 xs->header = (struct ocfs2_xattr_header *)
1689                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1690         xs->base = (void *)xs->header;
1691         xs->here = xs->header->xh_entries;
1692
1693         /* Find the named attribute. */
1694         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1695                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1696                 if (ret && ret != -ENODATA)
1697                         return ret;
1698                 xs->not_found = ret;
1699         }
1700
1701         return 0;
1702 }
1703
1704 /*
1705  * ocfs2_xattr_ibody_set()
1706  *
1707  * Set, replace or remove an extended attribute into inode block.
1708  *
1709  */
1710 static int ocfs2_xattr_ibody_set(struct inode *inode,
1711                                  struct ocfs2_xattr_info *xi,
1712                                  struct ocfs2_xattr_search *xs)
1713 {
1714         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1715         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1716         int ret;
1717
1718         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1719                 return -ENOSPC;
1720
1721         down_write(&oi->ip_alloc_sem);
1722         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1723                 if (!ocfs2_xattr_has_space_inline(inode, di)) {
1724                         ret = -ENOSPC;
1725                         goto out;
1726                 }
1727         }
1728
1729         ret = ocfs2_xattr_set_entry(inode, xi, xs,
1730                                 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
1731 out:
1732         up_write(&oi->ip_alloc_sem);
1733
1734         return ret;
1735 }
1736
1737 /*
1738  * ocfs2_xattr_block_find()
1739  *
1740  * Find extended attribute in external block and
1741  * fill search info into struct ocfs2_xattr_search.
1742  */
1743 static int ocfs2_xattr_block_find(struct inode *inode,
1744                                   int name_index,
1745                                   const char *name,
1746                                   struct ocfs2_xattr_search *xs)
1747 {
1748         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1749         struct buffer_head *blk_bh = NULL;
1750         struct ocfs2_xattr_block *xb;
1751         int ret = 0;
1752
1753         if (!di->i_xattr_loc)
1754                 return ret;
1755
1756         ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
1757         if (ret < 0) {
1758                 mlog_errno(ret);
1759                 return ret;
1760         }
1761
1762         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1763         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
1764                 ret = -EIO;
1765                 goto cleanup;
1766         }
1767
1768         xs->xattr_bh = blk_bh;
1769
1770         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1771                 xs->header = &xb->xb_attrs.xb_header;
1772                 xs->base = (void *)xs->header;
1773                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
1774                 xs->here = xs->header->xh_entries;
1775
1776                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1777         } else
1778                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
1779                                                    name_index,
1780                                                    name, xs);
1781
1782         if (ret && ret != -ENODATA) {
1783                 xs->xattr_bh = NULL;
1784                 goto cleanup;
1785         }
1786         xs->not_found = ret;
1787         return 0;
1788 cleanup:
1789         brelse(blk_bh);
1790
1791         return ret;
1792 }
1793
1794 /*
1795  * ocfs2_xattr_block_set()
1796  *
1797  * Set, replace or remove an extended attribute into external block.
1798  *
1799  */
1800 static int ocfs2_xattr_block_set(struct inode *inode,
1801                                  struct ocfs2_xattr_info *xi,
1802                                  struct ocfs2_xattr_search *xs)
1803 {
1804         struct buffer_head *new_bh = NULL;
1805         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1806         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)xs->inode_bh->b_data;
1807         struct ocfs2_alloc_context *meta_ac = NULL;
1808         handle_t *handle = NULL;
1809         struct ocfs2_xattr_block *xblk = NULL;
1810         u16 suballoc_bit_start;
1811         u32 num_got;
1812         u64 first_blkno;
1813         int ret;
1814
1815         if (!xs->xattr_bh) {
1816                 /*
1817                  * Alloc one external block for extended attribute
1818                  * outside of inode.
1819                  */
1820                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
1821                 if (ret < 0) {
1822                         mlog_errno(ret);
1823                         goto out;
1824                 }
1825                 handle = ocfs2_start_trans(osb,
1826                                            OCFS2_XATTR_BLOCK_CREATE_CREDITS);
1827                 if (IS_ERR(handle)) {
1828                         ret = PTR_ERR(handle);
1829                         mlog_errno(ret);
1830                         goto out;
1831                 }
1832                 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1833                                            OCFS2_JOURNAL_ACCESS_CREATE);
1834                 if (ret < 0) {
1835                         mlog_errno(ret);
1836                         goto out_commit;
1837                 }
1838
1839                 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
1840                                            &suballoc_bit_start, &num_got,
1841                                            &first_blkno);
1842                 if (ret < 0) {
1843                         mlog_errno(ret);
1844                         goto out_commit;
1845                 }
1846
1847                 new_bh = sb_getblk(inode->i_sb, first_blkno);
1848                 ocfs2_set_new_buffer_uptodate(inode, new_bh);
1849
1850                 ret = ocfs2_journal_access(handle, inode, new_bh,
1851                                            OCFS2_JOURNAL_ACCESS_CREATE);
1852                 if (ret < 0) {
1853                         mlog_errno(ret);
1854                         goto out_commit;
1855                 }
1856
1857                 /* Initialize ocfs2_xattr_block */
1858                 xs->xattr_bh = new_bh;
1859                 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
1860                 memset(xblk, 0, inode->i_sb->s_blocksize);
1861                 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
1862                 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
1863                 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1864                 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
1865                 xblk->xb_blkno = cpu_to_le64(first_blkno);
1866
1867                 xs->header = &xblk->xb_attrs.xb_header;
1868                 xs->base = (void *)xs->header;
1869                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
1870                 xs->here = xs->header->xh_entries;
1871
1872
1873                 ret = ocfs2_journal_dirty(handle, new_bh);
1874                 if (ret < 0) {
1875                         mlog_errno(ret);
1876                         goto out_commit;
1877                 }
1878                 di->i_xattr_loc = cpu_to_le64(first_blkno);
1879                 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1880                 if (ret < 0)
1881                         mlog_errno(ret);
1882 out_commit:
1883                 ocfs2_commit_trans(osb, handle);
1884 out:
1885                 if (meta_ac)
1886                         ocfs2_free_alloc_context(meta_ac);
1887                 if (ret < 0)
1888                         return ret;
1889         } else
1890                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1891
1892         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
1893                 /* Set extended attribute into external block */
1894                 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
1895                 if (!ret || ret != -ENOSPC)
1896                         goto end;
1897
1898                 ret = ocfs2_xattr_create_index_block(inode, xs);
1899                 if (ret)
1900                         goto end;
1901         }
1902
1903         ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
1904
1905 end:
1906
1907         return ret;
1908 }
1909
1910 /*
1911  * ocfs2_xattr_set()
1912  *
1913  * Set, replace or remove an extended attribute for this inode.
1914  * value is NULL to remove an existing extended attribute, else either
1915  * create or replace an extended attribute.
1916  */
1917 int ocfs2_xattr_set(struct inode *inode,
1918                     int name_index,
1919                     const char *name,
1920                     const void *value,
1921                     size_t value_len,
1922                     int flags)
1923 {
1924         struct buffer_head *di_bh = NULL;
1925         struct ocfs2_dinode *di;
1926         int ret;
1927         u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
1928
1929         struct ocfs2_xattr_info xi = {
1930                 .name_index = name_index,
1931                 .name = name,
1932                 .value = value,
1933                 .value_len = value_len,
1934         };
1935
1936         struct ocfs2_xattr_search xis = {
1937                 .not_found = -ENODATA,
1938         };
1939
1940         struct ocfs2_xattr_search xbs = {
1941                 .not_found = -ENODATA,
1942         };
1943
1944         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1945                 return -EOPNOTSUPP;
1946
1947         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1948         if (ret < 0) {
1949                 mlog_errno(ret);
1950                 return ret;
1951         }
1952         xis.inode_bh = xbs.inode_bh = di_bh;
1953         di = (struct ocfs2_dinode *)di_bh->b_data;
1954
1955         down_write(&OCFS2_I(inode)->ip_xattr_sem);
1956         /*
1957          * Scan inode and external block to find the same name
1958          * extended attribute and collect search infomation.
1959          */
1960         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
1961         if (ret)
1962                 goto cleanup;
1963         if (xis.not_found) {
1964                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
1965                 if (ret)
1966                         goto cleanup;
1967         }
1968
1969         if (xis.not_found && xbs.not_found) {
1970                 ret = -ENODATA;
1971                 if (flags & XATTR_REPLACE)
1972                         goto cleanup;
1973                 ret = 0;
1974                 if (!value)
1975                         goto cleanup;
1976         } else {
1977                 ret = -EEXIST;
1978                 if (flags & XATTR_CREATE)
1979                         goto cleanup;
1980         }
1981
1982         if (!value) {
1983                 /* Remove existing extended attribute */
1984                 if (!xis.not_found)
1985                         ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
1986                 else if (!xbs.not_found)
1987                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
1988         } else {
1989                 /* We always try to set extended attribute into inode first*/
1990                 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
1991                 if (!ret && !xbs.not_found) {
1992                         /*
1993                          * If succeed and that extended attribute existing in
1994                          * external block, then we will remove it.
1995                          */
1996                         xi.value = NULL;
1997                         xi.value_len = 0;
1998                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
1999                 } else if (ret == -ENOSPC) {
2000                         if (di->i_xattr_loc && !xbs.xattr_bh) {
2001                                 ret = ocfs2_xattr_block_find(inode, name_index,
2002                                                              name, &xbs);
2003                                 if (ret)
2004                                         goto cleanup;
2005                         }
2006                         /*
2007                          * If no space in inode, we will set extended attribute
2008                          * into external block.
2009                          */
2010                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2011                         if (ret)
2012                                 goto cleanup;
2013                         if (!xis.not_found) {
2014                                 /*
2015                                  * If succeed and that extended attribute
2016                                  * existing in inode, we will remove it.
2017                                  */
2018                                 xi.value = NULL;
2019                                 xi.value_len = 0;
2020                                 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2021                         }
2022                 }
2023         }
2024 cleanup:
2025         up_write(&OCFS2_I(inode)->ip_xattr_sem);
2026         ocfs2_inode_unlock(inode, 1);
2027         brelse(di_bh);
2028         brelse(xbs.xattr_bh);
2029         for (i = 0; i < blk_per_bucket; i++)
2030                 brelse(xbs.bucket.bhs[i]);
2031
2032         return ret;
2033 }
2034
2035 /*
2036  * Find the xattr extent rec which may contains name_hash.
2037  * e_cpos will be the first name hash of the xattr rec.
2038  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2039  */
2040 static int ocfs2_xattr_get_rec(struct inode *inode,
2041                                u32 name_hash,
2042                                u64 *p_blkno,
2043                                u32 *e_cpos,
2044                                u32 *num_clusters,
2045                                struct ocfs2_extent_list *el)
2046 {
2047         int ret = 0, i;
2048         struct buffer_head *eb_bh = NULL;
2049         struct ocfs2_extent_block *eb;
2050         struct ocfs2_extent_rec *rec = NULL;
2051         u64 e_blkno = 0;
2052
2053         if (el->l_tree_depth) {
2054                 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2055                 if (ret) {
2056                         mlog_errno(ret);
2057                         goto out;
2058                 }
2059
2060                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2061                 el = &eb->h_list;
2062
2063                 if (el->l_tree_depth) {
2064                         ocfs2_error(inode->i_sb,
2065                                     "Inode %lu has non zero tree depth in "
2066                                     "xattr tree block %llu\n", inode->i_ino,
2067                                     (unsigned long long)eb_bh->b_blocknr);
2068                         ret = -EROFS;
2069                         goto out;
2070                 }
2071         }
2072
2073         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2074                 rec = &el->l_recs[i];
2075
2076                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2077                         e_blkno = le64_to_cpu(rec->e_blkno);
2078                         break;
2079                 }
2080         }
2081
2082         if (!e_blkno) {
2083                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2084                             "record (%u, %u, 0) in xattr", inode->i_ino,
2085                             le32_to_cpu(rec->e_cpos),
2086                             ocfs2_rec_clusters(el, rec));
2087                 ret = -EROFS;
2088                 goto out;
2089         }
2090
2091         *p_blkno = le64_to_cpu(rec->e_blkno);
2092         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2093         if (e_cpos)
2094                 *e_cpos = le32_to_cpu(rec->e_cpos);
2095 out:
2096         brelse(eb_bh);
2097         return ret;
2098 }
2099
2100 typedef int (xattr_bucket_func)(struct inode *inode,
2101                                 struct ocfs2_xattr_bucket *bucket,
2102                                 void *para);
2103
2104 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2105                                    struct buffer_head *header_bh,
2106                                    int name_index,
2107                                    const char *name,
2108                                    u32 name_hash,
2109                                    u16 *xe_index,
2110                                    int *found)
2111 {
2112         int i, ret = 0, cmp = 1, block_off, new_offset;
2113         struct ocfs2_xattr_header *xh =
2114                         (struct ocfs2_xattr_header *)header_bh->b_data;
2115         size_t name_len = strlen(name);
2116         struct ocfs2_xattr_entry *xe = NULL;
2117         struct buffer_head *name_bh = NULL;
2118         char *xe_name;
2119
2120         /*
2121          * We don't use binary search in the bucket because there
2122          * may be multiple entries with the same name hash.
2123          */
2124         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2125                 xe = &xh->xh_entries[i];
2126
2127                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2128                         continue;
2129                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2130                         break;
2131
2132                 cmp = name_index - ocfs2_xattr_get_type(xe);
2133                 if (!cmp)
2134                         cmp = name_len - xe->xe_name_len;
2135                 if (cmp)
2136                         continue;
2137
2138                 ret = ocfs2_xattr_bucket_get_name_value(inode,
2139                                                         xh,
2140                                                         i,
2141                                                         &block_off,
2142                                                         &new_offset);
2143                 if (ret) {
2144                         mlog_errno(ret);
2145                         break;
2146                 }
2147
2148                 ret = ocfs2_read_block(inode, header_bh->b_blocknr + block_off,
2149                                        &name_bh);
2150                 if (ret) {
2151                         mlog_errno(ret);
2152                         break;
2153                 }
2154                 xe_name = name_bh->b_data + new_offset;
2155
2156                 cmp = memcmp(name, xe_name, name_len);
2157                 brelse(name_bh);
2158                 name_bh = NULL;
2159
2160                 if (cmp == 0) {
2161                         *xe_index = i;
2162                         *found = 1;
2163                         ret = 0;
2164                         break;
2165                 }
2166         }
2167
2168         return ret;
2169 }
2170
2171 /*
2172  * Find the specified xattr entry in a series of buckets.
2173  * This series start from p_blkno and last for num_clusters.
2174  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2175  * the num of the valid buckets.
2176  *
2177  * Return the buffer_head this xattr should reside in. And if the xattr's
2178  * hash is in the gap of 2 buckets, return the lower bucket.
2179  */
2180 static int ocfs2_xattr_bucket_find(struct inode *inode,
2181                                    int name_index,
2182                                    const char *name,
2183                                    u32 name_hash,
2184                                    u64 p_blkno,
2185                                    u32 first_hash,
2186                                    u32 num_clusters,
2187                                    struct ocfs2_xattr_search *xs)
2188 {
2189         int ret, found = 0;
2190         struct buffer_head *bh = NULL;
2191         struct buffer_head *lower_bh = NULL;
2192         struct ocfs2_xattr_header *xh = NULL;
2193         struct ocfs2_xattr_entry *xe = NULL;
2194         u16 index = 0;
2195         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2196         int low_bucket = 0, bucket, high_bucket;
2197         u32 last_hash;
2198         u64 blkno;
2199
2200         ret = ocfs2_read_block(inode, p_blkno, &bh);
2201         if (ret) {
2202                 mlog_errno(ret);
2203                 goto out;
2204         }
2205
2206         xh = (struct ocfs2_xattr_header *)bh->b_data;
2207         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2208
2209         while (low_bucket <= high_bucket) {
2210                 brelse(bh);
2211                 bh = NULL;
2212                 bucket = (low_bucket + high_bucket) / 2;
2213
2214                 blkno = p_blkno + bucket * blk_per_bucket;
2215
2216                 ret = ocfs2_read_block(inode, blkno, &bh);
2217                 if (ret) {
2218                         mlog_errno(ret);
2219                         goto out;
2220                 }
2221
2222                 xh = (struct ocfs2_xattr_header *)bh->b_data;
2223                 xe = &xh->xh_entries[0];
2224                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
2225                         high_bucket = bucket - 1;
2226                         continue;
2227                 }
2228
2229                 /*
2230                  * Check whether the hash of the last entry in our
2231                  * bucket is larger than the search one. for an empty
2232                  * bucket, the last one is also the first one.
2233                  */
2234                 if (xh->xh_count)
2235                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
2236
2237                 last_hash = le32_to_cpu(xe->xe_name_hash);
2238
2239                 /* record lower_bh which may be the insert place. */
2240                 brelse(lower_bh);
2241                 lower_bh = bh;
2242                 bh = NULL;
2243
2244                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
2245                         low_bucket = bucket + 1;
2246                         continue;
2247                 }
2248
2249                 /* the searched xattr should reside in this bucket if exists. */
2250                 ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
2251                                               name_index, name, name_hash,
2252                                               &index, &found);
2253                 if (ret) {
2254                         mlog_errno(ret);
2255                         goto out;
2256                 }
2257                 break;
2258         }
2259
2260         /*
2261          * Record the bucket we have found.
2262          * When the xattr's hash value is in the gap of 2 buckets, we will
2263          * always set it to the previous bucket.
2264          */
2265         if (!lower_bh) {
2266                 /*
2267                  * We can't find any bucket whose first name_hash is less
2268                  * than the find name_hash.
2269                  */
2270                 BUG_ON(bh->b_blocknr != p_blkno);
2271                 lower_bh = bh;
2272                 bh = NULL;
2273         }
2274         xs->bucket.bhs[0] = lower_bh;
2275         xs->bucket.xh = (struct ocfs2_xattr_header *)
2276                                         xs->bucket.bhs[0]->b_data;
2277         lower_bh = NULL;
2278
2279         xs->header = xs->bucket.xh;
2280         xs->base = xs->bucket.bhs[0]->b_data;
2281         xs->end = xs->base + inode->i_sb->s_blocksize;
2282
2283         if (found) {
2284                 /*
2285                  * If we have found the xattr enty, read all the blocks in
2286                  * this bucket.
2287                  */
2288                 ret = ocfs2_read_blocks(inode, xs->bucket.bhs[0]->b_blocknr + 1,
2289                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
2290                                         0);
2291                 if (ret) {
2292                         mlog_errno(ret);
2293                         goto out;
2294                 }
2295
2296                 xs->here = &xs->header->xh_entries[index];
2297                 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
2298                      (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
2299         } else
2300                 ret = -ENODATA;
2301
2302 out:
2303         brelse(bh);
2304         brelse(lower_bh);
2305         return ret;
2306 }
2307
2308 static int ocfs2_xattr_index_block_find(struct inode *inode,
2309                                         struct buffer_head *root_bh,
2310                                         int name_index,
2311                                         const char *name,
2312                                         struct ocfs2_xattr_search *xs)
2313 {
2314         int ret;
2315         struct ocfs2_xattr_block *xb =
2316                         (struct ocfs2_xattr_block *)root_bh->b_data;
2317         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
2318         struct ocfs2_extent_list *el = &xb_root->xt_list;
2319         u64 p_blkno = 0;
2320         u32 first_hash, num_clusters = 0;
2321         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
2322
2323         if (le16_to_cpu(el->l_next_free_rec) == 0)
2324                 return -ENODATA;
2325
2326         mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
2327              name, name_hash, name_index);
2328
2329         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
2330                                   &num_clusters, el);
2331         if (ret) {
2332                 mlog_errno(ret);
2333                 goto out;
2334         }
2335
2336         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
2337
2338         mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
2339              "in the rec is %u\n", num_clusters, p_blkno, first_hash);
2340
2341         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
2342                                       p_blkno, first_hash, num_clusters, xs);
2343
2344 out:
2345         return ret;
2346 }
2347
2348 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
2349                                        u64 blkno,
2350                                        u32 clusters,
2351                                        xattr_bucket_func *func,
2352                                        void *para)
2353 {
2354         int i, j, ret = 0;
2355         int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2356         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
2357         u32 num_buckets = clusters * bpc;
2358         struct ocfs2_xattr_bucket bucket;
2359
2360         memset(&bucket, 0, sizeof(bucket));
2361
2362         mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
2363              clusters, blkno);
2364
2365         for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
2366                 ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket,
2367                                         bucket.bhs, 0);
2368                 if (ret) {
2369                         mlog_errno(ret);
2370                         goto out;
2371                 }
2372
2373                 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
2374                 /*
2375                  * The real bucket num in this series of blocks is stored
2376                  * in the 1st bucket.
2377                  */
2378                 if (i == 0)
2379                         num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
2380
2381                 mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno,
2382                      le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash));
2383                 if (func) {
2384                         ret = func(inode, &bucket, para);
2385                         if (ret) {
2386                                 mlog_errno(ret);
2387                                 break;
2388                         }
2389                 }
2390
2391                 for (j = 0; j < blk_per_bucket; j++)
2392                         brelse(bucket.bhs[j]);
2393                 memset(&bucket, 0, sizeof(bucket));
2394         }
2395
2396 out:
2397         for (j = 0; j < blk_per_bucket; j++)
2398                 brelse(bucket.bhs[j]);
2399
2400         return ret;
2401 }
2402
2403 struct ocfs2_xattr_tree_list {
2404         char *buffer;
2405         size_t buffer_size;
2406         size_t result;
2407 };
2408
2409 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
2410                                              struct ocfs2_xattr_header *xh,
2411                                              int index,
2412                                              int *block_off,
2413                                              int *new_offset)
2414 {
2415         u16 name_offset;
2416
2417         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
2418                 return -EINVAL;
2419
2420         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
2421
2422         *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
2423         *new_offset = name_offset % inode->i_sb->s_blocksize;
2424
2425         return 0;
2426 }
2427
2428 static int ocfs2_list_xattr_bucket(struct inode *inode,
2429                                    struct ocfs2_xattr_bucket *bucket,
2430                                    void *para)
2431 {
2432         int ret = 0, type;
2433         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
2434         int i, block_off, new_offset;
2435         const char *prefix, *name;
2436
2437         for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
2438                 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
2439                 type = ocfs2_xattr_get_type(entry);
2440                 prefix = ocfs2_xattr_prefix(type);
2441
2442                 if (prefix) {
2443                         ret = ocfs2_xattr_bucket_get_name_value(inode,
2444                                                                 bucket->xh,
2445                                                                 i,
2446                                                                 &block_off,
2447                                                                 &new_offset);
2448                         if (ret)
2449                                 break;
2450
2451                         name = (const char *)bucket->bhs[block_off]->b_data +
2452                                 new_offset;
2453                         ret = ocfs2_xattr_list_entry(xl->buffer,
2454                                                      xl->buffer_size,
2455                                                      &xl->result,
2456                                                      prefix, name,
2457                                                      entry->xe_name_len);
2458                         if (ret)
2459                                 break;
2460                 }
2461         }
2462
2463         return ret;
2464 }
2465
2466 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
2467                                              struct ocfs2_xattr_tree_root *xt,
2468                                              char *buffer,
2469                                              size_t buffer_size)
2470 {
2471         struct ocfs2_extent_list *el = &xt->xt_list;
2472         int ret = 0;
2473         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
2474         u64 p_blkno = 0;
2475         struct ocfs2_xattr_tree_list xl = {
2476                 .buffer = buffer,
2477                 .buffer_size = buffer_size,
2478                 .result = 0,
2479         };
2480
2481         if (le16_to_cpu(el->l_next_free_rec) == 0)
2482                 return 0;
2483
2484         while (name_hash > 0) {
2485                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
2486                                           &e_cpos, &num_clusters, el);
2487                 if (ret) {
2488                         mlog_errno(ret);
2489                         goto out;
2490                 }
2491
2492                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
2493                                                   ocfs2_list_xattr_bucket,
2494                                                   &xl);
2495                 if (ret) {
2496                         mlog_errno(ret);
2497                         goto out;
2498                 }
2499
2500                 if (e_cpos == 0)
2501                         break;
2502
2503                 name_hash = e_cpos - 1;
2504         }
2505
2506         ret = xl.result;
2507 out:
2508         return ret;
2509 }
2510
2511 static int cmp_xe(const void *a, const void *b)
2512 {
2513         const struct ocfs2_xattr_entry *l = a, *r = b;
2514         u32 l_hash = le32_to_cpu(l->xe_name_hash);
2515         u32 r_hash = le32_to_cpu(r->xe_name_hash);
2516
2517         if (l_hash > r_hash)
2518                 return 1;
2519         if (l_hash < r_hash)
2520                 return -1;
2521         return 0;
2522 }
2523
2524 static void swap_xe(void *a, void *b, int size)
2525 {
2526         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
2527
2528         tmp = *l;
2529         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
2530         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
2531 }
2532
2533 /*
2534  * When the ocfs2_xattr_block is filled up, new bucket will be created
2535  * and all the xattr entries will be moved to the new bucket.
2536  * Note: we need to sort the entries since they are not saved in order
2537  * in the ocfs2_xattr_block.
2538  */
2539 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
2540                                            struct buffer_head *xb_bh,
2541                                            struct buffer_head *xh_bh,
2542                                            struct buffer_head *data_bh)
2543 {
2544         int i, blocksize = inode->i_sb->s_blocksize;
2545         u16 offset, size, off_change;
2546         struct ocfs2_xattr_entry *xe;
2547         struct ocfs2_xattr_block *xb =
2548                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
2549         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
2550         struct ocfs2_xattr_header *xh =
2551                                 (struct ocfs2_xattr_header *)xh_bh->b_data;
2552         u16 count = le16_to_cpu(xb_xh->xh_count);
2553         char *target = xh_bh->b_data, *src = xb_bh->b_data;
2554
2555         mlog(0, "cp xattr from block %llu to bucket %llu\n",
2556              (unsigned long long)xb_bh->b_blocknr,
2557              (unsigned long long)xh_bh->b_blocknr);
2558
2559         memset(xh_bh->b_data, 0, blocksize);
2560         if (data_bh)
2561                 memset(data_bh->b_data, 0, blocksize);
2562         /*
2563          * Since the xe_name_offset is based on ocfs2_xattr_header,
2564          * there is a offset change corresponding to the change of
2565          * ocfs2_xattr_header's position.
2566          */
2567         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2568         xe = &xb_xh->xh_entries[count - 1];
2569         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
2570         size = blocksize - offset;
2571
2572         /* copy all the names and values. */
2573         if (data_bh)
2574                 target = data_bh->b_data;
2575         memcpy(target + offset, src + offset, size);
2576
2577         /* Init new header now. */
2578         xh->xh_count = xb_xh->xh_count;
2579         xh->xh_num_buckets = cpu_to_le16(1);
2580         xh->xh_name_value_len = cpu_to_le16(size);
2581         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
2582
2583         /* copy all the entries. */
2584         target = xh_bh->b_data;
2585         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
2586         size = count * sizeof(struct ocfs2_xattr_entry);
2587         memcpy(target + offset, (char *)xb_xh + offset, size);
2588
2589         /* Change the xe offset for all the xe because of the move. */
2590         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
2591                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2592         for (i = 0; i < count; i++)
2593                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
2594
2595         mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
2596              offset, size, off_change);
2597
2598         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
2599              cmp_xe, swap_xe);
2600 }
2601
2602 /*
2603  * After we move xattr from block to index btree, we have to
2604  * update ocfs2_xattr_search to the new xe and base.
2605  *
2606  * When the entry is in xattr block, xattr_bh indicates the storage place.
2607  * While if the entry is in index b-tree, "bucket" indicates the
2608  * real place of the xattr.
2609  */
2610 static int ocfs2_xattr_update_xattr_search(struct inode *inode,
2611                                            struct ocfs2_xattr_search *xs,
2612                                            struct buffer_head *old_bh,
2613                                            struct buffer_head *new_bh)
2614 {
2615         int ret = 0;
2616         char *buf = old_bh->b_data;
2617         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
2618         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
2619         int i, blocksize = inode->i_sb->s_blocksize;
2620         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2621
2622         xs->bucket.bhs[0] = new_bh;
2623         get_bh(new_bh);
2624         xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
2625         xs->header = xs->bucket.xh;
2626
2627         xs->base = new_bh->b_data;
2628         xs->end = xs->base + inode->i_sb->s_blocksize;
2629
2630         if (!xs->not_found) {
2631                 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
2632                         ret = ocfs2_read_blocks(inode,
2633                                         xs->bucket.bhs[0]->b_blocknr + 1,
2634                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
2635                                         0);
2636                         if (ret) {
2637                                 mlog_errno(ret);
2638                                 return ret;
2639                         }
2640
2641                         i = xs->here - old_xh->xh_entries;
2642                         xs->here = &xs->header->xh_entries[i];
2643                 }
2644         }
2645
2646         return ret;
2647 }
2648
2649 static int ocfs2_xattr_create_index_block(struct inode *inode,
2650                                           struct ocfs2_xattr_search *xs)
2651 {
2652         int ret, credits = OCFS2_SUBALLOC_ALLOC;
2653         u32 bit_off, len;
2654         u64 blkno;
2655         handle_t *handle;
2656         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2657         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2658         struct ocfs2_alloc_context *data_ac;
2659         struct buffer_head *xh_bh = NULL, *data_bh = NULL;
2660         struct buffer_head *xb_bh = xs->xattr_bh;
2661         struct ocfs2_xattr_block *xb =
2662                         (struct ocfs2_xattr_block *)xb_bh->b_data;
2663         struct ocfs2_xattr_tree_root *xr;
2664         u16 xb_flags = le16_to_cpu(xb->xb_flags);
2665         u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2666
2667         mlog(0, "create xattr index block for %llu\n",
2668              (unsigned long long)xb_bh->b_blocknr);
2669
2670         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
2671
2672         ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
2673         if (ret) {
2674                 mlog_errno(ret);
2675                 goto out;
2676         }
2677
2678         /*
2679          * XXX:
2680          * We can use this lock for now, and maybe move to a dedicated mutex
2681          * if performance becomes a problem later.
2682          */
2683         down_write(&oi->ip_alloc_sem);
2684
2685         /*
2686          * 3 more credits, one for xattr block update, one for the 1st block
2687          * of the new xattr bucket and one for the value/data.
2688          */
2689         credits += 3;
2690         handle = ocfs2_start_trans(osb, credits);
2691         if (IS_ERR(handle)) {
2692                 ret = PTR_ERR(handle);
2693                 mlog_errno(ret);
2694                 goto out_sem;
2695         }
2696
2697         ret = ocfs2_journal_access(handle, inode, xb_bh,
2698                                    OCFS2_JOURNAL_ACCESS_WRITE);
2699         if (ret) {
2700                 mlog_errno(ret);
2701                 goto out_commit;
2702         }
2703
2704         ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
2705         if (ret) {
2706                 mlog_errno(ret);
2707                 goto out_commit;
2708         }
2709
2710         /*
2711          * The bucket may spread in many blocks, and
2712          * we will only touch the 1st block and the last block
2713          * in the whole bucket(one for entry and one for data).
2714          */
2715         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
2716
2717         mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
2718
2719         xh_bh = sb_getblk(inode->i_sb, blkno);
2720         if (!xh_bh) {
2721                 ret = -EIO;
2722                 mlog_errno(ret);
2723                 goto out_commit;
2724         }
2725
2726         ocfs2_set_new_buffer_uptodate(inode, xh_bh);
2727
2728         ret = ocfs2_journal_access(handle, inode, xh_bh,
2729                                    OCFS2_JOURNAL_ACCESS_CREATE);
2730         if (ret) {
2731                 mlog_errno(ret);
2732                 goto out_commit;
2733         }
2734
2735         if (bpb > 1) {
2736                 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
2737                 if (!data_bh) {
2738                         ret = -EIO;
2739                         mlog_errno(ret);
2740                         goto out_commit;
2741                 }
2742
2743                 ocfs2_set_new_buffer_uptodate(inode, data_bh);
2744
2745                 ret = ocfs2_journal_access(handle, inode, data_bh,
2746                                            OCFS2_JOURNAL_ACCESS_CREATE);
2747                 if (ret) {
2748                         mlog_errno(ret);
2749                         goto out_commit;
2750                 }
2751         }
2752
2753         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
2754
2755         ocfs2_journal_dirty(handle, xh_bh);
2756         if (data_bh)
2757                 ocfs2_journal_dirty(handle, data_bh);
2758
2759         ret = ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
2760         if (ret) {
2761                 mlog_errno(ret);
2762                 goto out_commit;
2763         }
2764
2765         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
2766         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
2767                offsetof(struct ocfs2_xattr_block, xb_attrs));
2768
2769         xr = &xb->xb_attrs.xb_root;
2770         xr->xt_clusters = cpu_to_le32(1);
2771         xr->xt_last_eb_blk = 0;
2772         xr->xt_list.l_tree_depth = 0;
2773         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
2774         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2775
2776         xr->xt_list.l_recs[0].e_cpos = 0;
2777         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
2778         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
2779
2780         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
2781
2782         ret = ocfs2_journal_dirty(handle, xb_bh);
2783         if (ret) {
2784                 mlog_errno(ret);
2785                 goto out_commit;
2786         }
2787
2788 out_commit:
2789         ocfs2_commit_trans(osb, handle);
2790
2791 out_sem:
2792         up_write(&oi->ip_alloc_sem);
2793
2794 out:
2795         if (data_ac)
2796                 ocfs2_free_alloc_context(data_ac);
2797
2798         brelse(xh_bh);
2799         brelse(data_bh);
2800
2801         return ret;
2802 }
2803
2804 static int cmp_xe_offset(const void *a, const void *b)
2805 {
2806         const struct ocfs2_xattr_entry *l = a, *r = b;
2807         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
2808         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
2809
2810         if (l_name_offset < r_name_offset)
2811                 return 1;
2812         if (l_name_offset > r_name_offset)
2813                 return -1;
2814         return 0;
2815 }
2816
2817 /*
2818  * defrag a xattr bucket if we find that the bucket has some
2819  * holes beteen name/value pairs.
2820  * We will move all the name/value pairs to the end of the bucket
2821  * so that we can spare some space for insertion.
2822  */
2823 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
2824                                      struct ocfs2_xattr_bucket *bucket)
2825 {
2826         int ret, i;
2827         size_t end, offset, len, value_len;
2828         struct ocfs2_xattr_header *xh;
2829         char *entries, *buf, *bucket_buf = NULL;
2830         u64 blkno = bucket->bhs[0]->b_blocknr;
2831         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2832         u16 xh_free_start;
2833         size_t blocksize = inode->i_sb->s_blocksize;
2834         handle_t *handle;
2835         struct buffer_head **bhs;
2836         struct ocfs2_xattr_entry *xe;
2837
2838         bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
2839                         GFP_NOFS);
2840         if (!bhs)
2841                 return -ENOMEM;
2842
2843         ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket, bhs, 0);
2844         if (ret)
2845                 goto out;
2846
2847         /*
2848          * In order to make the operation more efficient and generic,
2849          * we copy all the blocks into a contiguous memory and do the
2850          * defragment there, so if anything is error, we will not touch
2851          * the real block.
2852          */
2853         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
2854         if (!bucket_buf) {
2855                 ret = -EIO;
2856                 goto out;
2857         }
2858
2859         buf = bucket_buf;
2860         for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
2861                 memcpy(buf, bhs[i]->b_data, blocksize);
2862
2863         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
2864         if (IS_ERR(handle)) {
2865                 ret = PTR_ERR(handle);
2866                 handle = NULL;
2867                 mlog_errno(ret);
2868                 goto out;
2869         }
2870
2871         for (i = 0; i < blk_per_bucket; i++) {
2872                 ret = ocfs2_journal_access(handle, inode, bhs[i],
2873                                            OCFS2_JOURNAL_ACCESS_WRITE);
2874                 if (ret < 0) {
2875                         mlog_errno(ret);
2876                         goto commit;
2877                 }
2878         }
2879
2880         xh = (struct ocfs2_xattr_header *)bucket_buf;
2881         entries = (char *)xh->xh_entries;
2882         xh_free_start = le16_to_cpu(xh->xh_free_start);
2883
2884         mlog(0, "adjust xattr bucket in %llu, count = %u, "
2885              "xh_free_start = %u, xh_name_value_len = %u.\n",
2886              blkno, le16_to_cpu(xh->xh_count), xh_free_start,
2887              le16_to_cpu(xh->xh_name_value_len));
2888
2889         /*
2890          * sort all the entries by their offset.
2891          * the largest will be the first, so that we can
2892          * move them to the end one by one.
2893          */
2894         sort(entries, le16_to_cpu(xh->xh_count),
2895              sizeof(struct ocfs2_xattr_entry),
2896              cmp_xe_offset, swap_xe);
2897
2898         /* Move all name/values to the end of the bucket. */
2899         xe = xh->xh_entries;
2900         end = OCFS2_XATTR_BUCKET_SIZE;
2901         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
2902                 offset = le16_to_cpu(xe->xe_name_offset);
2903                 if (ocfs2_xattr_is_local(xe))
2904                         value_len = OCFS2_XATTR_SIZE(
2905                                         le64_to_cpu(xe->xe_value_size));
2906                 else
2907                         value_len = OCFS2_XATTR_ROOT_SIZE;
2908                 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
2909
2910                 /*
2911                  * We must make sure that the name/value pair
2912                  * exist in the same block. So adjust end to
2913                  * the previous block end if needed.
2914                  */
2915                 if (((end - len) / blocksize !=
2916                         (end - 1) / blocksize))
2917                         end = end - end % blocksize;
2918
2919                 if (end > offset + len) {
2920                         memmove(bucket_buf + end - len,
2921                                 bucket_buf + offset, len);
2922                         xe->xe_name_offset = cpu_to_le16(end - len);
2923                 }
2924
2925                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
2926                                 "bucket %llu\n", (unsigned long long)blkno);
2927
2928                 end -= len;
2929         }
2930
2931         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
2932                         "bucket %llu\n", (unsigned long long)blkno);
2933
2934         if (xh_free_start == end)
2935                 goto commit;
2936
2937         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
2938         xh->xh_free_start = cpu_to_le16(end);
2939
2940         /* sort the entries by their name_hash. */
2941         sort(entries, le16_to_cpu(xh->xh_count),
2942              sizeof(struct ocfs2_xattr_entry),
2943              cmp_xe, swap_xe);
2944
2945         buf = bucket_buf;
2946         for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
2947                 memcpy(bhs[i]->b_data, buf, blocksize);
2948                 ocfs2_journal_dirty(handle, bhs[i]);
2949         }
2950
2951 commit:
2952         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2953 out:
2954
2955         if (bhs) {
2956                 for (i = 0; i < blk_per_bucket; i++)
2957                         brelse(bhs[i]);
2958         }
2959         kfree(bhs);
2960
2961         kfree(bucket_buf);
2962         return ret;
2963 }
2964
2965 /*
2966  * Move half nums of the xattr bucket in the previous cluster to this new
2967  * cluster. We only touch the last cluster of the previous extend record.
2968  *
2969  * first_bh is the first buffer_head of a series of bucket in the same
2970  * extent rec and header_bh is the header of one bucket in this cluster.
2971  * They will be updated if we move the data header_bh contains to the new
2972  * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
2973  */
2974 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
2975                                                handle_t *handle,
2976                                                struct buffer_head **first_bh,
2977                                                struct buffer_head **header_bh,
2978                                                u64 new_blkno,
2979                                                u64 prev_blkno,
2980                                                u32 num_clusters,
2981                                                u32 *first_hash)
2982 {
2983         int i, ret, credits;
2984         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2985         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
2986         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
2987         int blocksize = inode->i_sb->s_blocksize;
2988         struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
2989         struct ocfs2_xattr_header *new_xh;
2990         struct ocfs2_xattr_header *xh =
2991                         (struct ocfs2_xattr_header *)((*first_bh)->b_data);
2992
2993         BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
2994         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
2995
2996         prev_bh = *first_bh;
2997         get_bh(prev_bh);
2998         xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
2999
3000         prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
3001
3002         mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3003              prev_blkno, new_blkno);
3004
3005         /*
3006          * We need to update the 1st half of the new cluster and
3007          * 1 more for the update of the 1st bucket of the previous
3008          * extent record.
3009          */
3010         credits = bpc / 2 + 1;
3011         ret = ocfs2_extend_trans(handle, credits);
3012         if (ret) {
3013                 mlog_errno(ret);
3014                 goto out;
3015         }
3016
3017         ret = ocfs2_journal_access(handle, inode, prev_bh,
3018                                    OCFS2_JOURNAL_ACCESS_WRITE);
3019         if (ret) {
3020                 mlog_errno(ret);
3021                 goto out;
3022         }
3023
3024         for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
3025                 old_bh = new_bh = NULL;
3026                 new_bh = sb_getblk(inode->i_sb, new_blkno);
3027                 if (!new_bh) {
3028                         ret = -EIO;
3029                         mlog_errno(ret);
3030                         goto out;
3031                 }
3032
3033                 ocfs2_set_new_buffer_uptodate(inode, new_bh);
3034
3035                 ret = ocfs2_journal_access(handle, inode, new_bh,
3036                                            OCFS2_JOURNAL_ACCESS_CREATE);
3037                 if (ret < 0) {
3038                         mlog_errno(ret);
3039                         brelse(new_bh);
3040                         goto out;
3041                 }
3042
3043                 ret = ocfs2_read_block(inode, prev_blkno, &old_bh);
3044                 if (ret < 0) {
3045                         mlog_errno(ret);
3046                         brelse(new_bh);
3047                         goto out;
3048                 }
3049
3050                 memcpy(new_bh->b_data, old_bh->b_data, blocksize);
3051
3052                 if (i == 0) {
3053                         new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
3054                         new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
3055
3056                         if (first_hash)
3057                                 *first_hash = le32_to_cpu(
3058                                         new_xh->xh_entries[0].xe_name_hash);
3059                         new_first_bh = new_bh;
3060                         get_bh(new_first_bh);
3061                 }
3062
3063                 ocfs2_journal_dirty(handle, new_bh);
3064
3065                 if (*header_bh == old_bh) {
3066                         brelse(*header_bh);
3067                         *header_bh = new_bh;
3068                         get_bh(*header_bh);
3069
3070                         brelse(*first_bh);
3071                         *first_bh = new_first_bh;
3072                         get_bh(*first_bh);
3073                 }
3074                 brelse(new_bh);
3075                 brelse(old_bh);
3076         }
3077
3078         le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
3079
3080         ocfs2_journal_dirty(handle, prev_bh);
3081 out:
3082         brelse(prev_bh);
3083         brelse(new_first_bh);
3084         return ret;
3085 }
3086
3087 static int ocfs2_read_xattr_bucket(struct inode *inode,
3088                                    u64 blkno,
3089                                    struct buffer_head **bhs,
3090                                    int new)
3091 {
3092         int ret = 0;
3093         u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3094
3095         if (!new)
3096                 return ocfs2_read_blocks(inode, blkno,
3097                                          blk_per_bucket, bhs, 0);
3098
3099         for (i = 0; i < blk_per_bucket; i++) {
3100                 bhs[i] = sb_getblk(inode->i_sb, blkno + i);
3101                 if (bhs[i] == NULL) {
3102                         ret = -EIO;
3103                         mlog_errno(ret);
3104                         break;
3105                 }
3106                 ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
3107         }
3108
3109         return ret;
3110 }
3111
3112 /*
3113  * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
3114  * first_hash will record the 1st hash of the new bucket.
3115  */
3116 static int ocfs2_half_xattr_bucket(struct inode *inode,
3117                                    handle_t *handle,
3118                                    u64 blk,
3119                                    u64 new_blk,
3120                                    u32 *first_hash,
3121                                    int new_bucket_head)
3122 {
3123         int ret, i;
3124         u16 count, start, len, name_value_len, xe_len, name_offset;
3125         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3126         struct buffer_head **s_bhs, **t_bhs = NULL;
3127         struct ocfs2_xattr_header *xh;
3128         struct ocfs2_xattr_entry *xe;
3129         int blocksize = inode->i_sb->s_blocksize;
3130
3131         mlog(0, "move half of xattrs from bucket %llu to %llu\n",
3132              blk, new_blk);
3133
3134         s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3135         if (!s_bhs)
3136                 return -ENOMEM;
3137
3138         ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
3139         if (ret) {
3140                 mlog_errno(ret);
3141                 goto out;
3142         }
3143
3144         ret = ocfs2_journal_access(handle, inode, s_bhs[0],
3145                                    OCFS2_JOURNAL_ACCESS_WRITE);
3146         if (ret) {
3147                 mlog_errno(ret);
3148                 goto out;
3149         }
3150
3151         t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3152         if (!t_bhs) {
3153                 ret = -ENOMEM;
3154                 goto out;
3155         }
3156
3157         ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
3158         if (ret) {
3159                 mlog_errno(ret);
3160                 goto out;
3161         }
3162
3163         for (i = 0; i < blk_per_bucket; i++) {
3164                 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3165                                            new_bucket_head ?
3166                                            OCFS2_JOURNAL_ACCESS_CREATE :
3167                                            OCFS2_JOURNAL_ACCESS_WRITE);
3168                 if (ret) {
3169                         mlog_errno(ret);
3170                         goto out;
3171                 }
3172         }
3173
3174         /* copy the whole bucket to the new first. */
3175         for (i = 0; i < blk_per_bucket; i++)
3176                 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3177
3178         /* update the new bucket. */
3179         xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
3180         count = le16_to_cpu(xh->xh_count);
3181         start = count / 2;
3182
3183         /*
3184          * Calculate the total name/value len and xh_free_start for
3185          * the old bucket first.
3186          */
3187         name_offset = OCFS2_XATTR_BUCKET_SIZE;
3188         name_value_len = 0;
3189         for (i = 0; i < start; i++) {
3190                 xe = &xh->xh_entries[i];
3191                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3192                 if (ocfs2_xattr_is_local(xe))
3193                         xe_len +=
3194                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3195                 else
3196                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3197                 name_value_len += xe_len;
3198                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3199                         name_offset = le16_to_cpu(xe->xe_name_offset);
3200         }
3201
3202         /*
3203          * Now begin the modification to the new bucket.
3204          *
3205          * In the new bucket, We just move the xattr entry to the beginning
3206          * and don't touch the name/value. So there will be some holes in the
3207          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3208          * called.
3209          */
3210         xe = &xh->xh_entries[start];
3211         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3212         mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3213              (int)((char *)xe - (char *)xh),
3214              (int)((char *)xh->xh_entries - (char *)xh));
3215         memmove((char *)xh->xh_entries, (char *)xe, len);
3216         xe = &xh->xh_entries[count - start];
3217         len = sizeof(struct ocfs2_xattr_entry) * start;
3218         memset((char *)xe, 0, len);
3219
3220         le16_add_cpu(&xh->xh_count, -start);
3221         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3222
3223         /* Calculate xh_free_start for the new bucket. */
3224         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3225         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3226                 xe = &xh->xh_entries[i];
3227                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3228                 if (ocfs2_xattr_is_local(xe))
3229                         xe_len +=
3230                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3231                 else
3232                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3233                 if (le16_to_cpu(xe->xe_name_offset) <
3234                     le16_to_cpu(xh->xh_free_start))
3235                         xh->xh_free_start = xe->xe_name_offset;
3236         }
3237
3238         /* set xh->xh_num_buckets for the new xh. */
3239         if (new_bucket_head)
3240                 xh->xh_num_buckets = cpu_to_le16(1);
3241         else
3242                 xh->xh_num_buckets = 0;
3243
3244         for (i = 0; i < blk_per_bucket; i++) {
3245                 ocfs2_journal_dirty(handle, t_bhs[i]);
3246                 if (ret)
3247                         mlog_errno(ret);
3248         }
3249
3250         /* store the first_hash of the new bucket. */
3251         if (first_hash)
3252                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3253
3254         /*
3255          * Now only update the 1st block of the old bucket.
3256          * Please note that the entry has been sorted already above.
3257          */
3258         xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
3259         memset(&xh->xh_entries[start], 0,
3260                sizeof(struct ocfs2_xattr_entry) * (count - start));
3261         xh->xh_count = cpu_to_le16(start);
3262         xh->xh_free_start = cpu_to_le16(name_offset);
3263         xh->xh_name_value_len = cpu_to_le16(name_value_len);
3264
3265         ocfs2_journal_dirty(handle, s_bhs[0]);
3266         if (ret)
3267                 mlog_errno(ret);
3268
3269 out:
3270         if (s_bhs) {
3271                 for (i = 0; i < blk_per_bucket; i++)
3272                         brelse(s_bhs[i]);
3273         }
3274         kfree(s_bhs);
3275
3276         if (t_bhs) {
3277                 for (i = 0; i < blk_per_bucket; i++)
3278                         brelse(t_bhs[i]);
3279         }
3280         kfree(t_bhs);
3281
3282         return ret;
3283 }
3284
3285 /*
3286  * Copy xattr from one bucket to another bucket.
3287  *
3288  * The caller must make sure that the journal transaction
3289  * has enough space for journaling.
3290  */
3291 static int ocfs2_cp_xattr_bucket(struct inode *inode,
3292                                  handle_t *handle,
3293                                  u64 s_blkno,
3294                                  u64 t_blkno,
3295                                  int t_is_new)
3296 {
3297         int ret, i;
3298         int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3299         int blocksize = inode->i_sb->s_blocksize;
3300         struct buffer_head **s_bhs, **t_bhs = NULL;
3301
3302         BUG_ON(s_blkno == t_blkno);
3303
3304         mlog(0, "cp bucket %llu to %llu, target is %d\n",
3305              s_blkno, t_blkno, t_is_new);
3306
3307         s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3308                         GFP_NOFS);
3309         if (!s_bhs)
3310                 return -ENOMEM;
3311
3312         ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
3313         if (ret)
3314                 goto out;
3315
3316         t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3317                         GFP_NOFS);
3318         if (!t_bhs) {
3319                 ret = -ENOMEM;
3320                 goto out;
3321         }
3322
3323         ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
3324         if (ret)
3325                 goto out;
3326
3327         for (i = 0; i < blk_per_bucket; i++) {
3328                 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3329                                            t_is_new ?
3330                                            OCFS2_JOURNAL_ACCESS_CREATE :
3331                                            OCFS2_JOURNAL_ACCESS_WRITE);
3332                 if (ret)
3333                         goto out;
3334         }
3335
3336         for (i = 0; i < blk_per_bucket; i++) {
3337                 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3338                 ocfs2_journal_dirty(handle, t_bhs[i]);
3339         }
3340
3341 out:
3342         if (s_bhs) {
3343                 for (i = 0; i < blk_per_bucket; i++)
3344                         brelse(s_bhs[i]);
3345         }
3346         kfree(s_bhs);
3347
3348         if (t_bhs) {
3349                 for (i = 0; i < blk_per_bucket; i++)
3350                         brelse(t_bhs[i]);
3351         }
3352         kfree(t_bhs);
3353
3354         return ret;
3355 }
3356
3357 /*
3358  * Copy one xattr cluster from src_blk to to_blk.
3359  * The to_blk will become the first bucket header of the cluster, so its
3360  * xh_num_buckets will be initialized as the bucket num in the cluster.
3361  */
3362 static int ocfs2_cp_xattr_cluster(struct inode *inode,
3363                                   handle_t *handle,
3364                                   struct buffer_head *first_bh,
3365                                   u64 src_blk,
3366                                   u64 to_blk,
3367                                   u32 *first_hash)
3368 {
3369         int i, ret, credits;
3370         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3371         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3372         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3373         struct buffer_head *bh = NULL;
3374         struct ocfs2_xattr_header *xh;
3375         u64 to_blk_start = to_blk;
3376
3377         mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
3378
3379         /*
3380          * We need to update the new cluster and 1 more for the update of
3381          * the 1st bucket of the previous extent rec.
3382          */
3383         credits = bpc + 1;
3384         ret = ocfs2_extend_trans(handle, credits);
3385         if (ret) {
3386                 mlog_errno(ret);
3387                 goto out;
3388         }
3389
3390         ret = ocfs2_journal_access(handle, inode, first_bh,
3391                                    OCFS2_JOURNAL_ACCESS_WRITE);
3392         if (ret) {
3393                 mlog_errno(ret);
3394                 goto out;
3395         }
3396
3397         for (i = 0; i < num_buckets; i++) {
3398                 ret = ocfs2_cp_xattr_bucket(inode, handle,
3399                                             src_blk, to_blk, 1);
3400                 if (ret) {
3401                         mlog_errno(ret);
3402                         goto out;
3403                 }
3404
3405                 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3406                 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3407         }
3408
3409         /* update the old bucket header. */
3410         xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3411         le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
3412
3413         ocfs2_journal_dirty(handle, first_bh);
3414
3415         /* update the new bucket header. */
3416         ret = ocfs2_read_block(inode, to_blk_start, &bh);
3417         if (ret < 0) {
3418                 mlog_errno(ret);
3419                 goto out;
3420         }
3421
3422         ret = ocfs2_journal_access(handle, inode, bh,
3423                                    OCFS2_JOURNAL_ACCESS_WRITE);
3424         if (ret) {
3425                 mlog_errno(ret);
3426                 goto out;
3427         }
3428
3429         xh = (struct ocfs2_xattr_header *)bh->b_data;
3430         xh->xh_num_buckets = cpu_to_le16(num_buckets);
3431
3432         ocfs2_journal_dirty(handle, bh);
3433
3434         if (first_hash)
3435                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3436 out:
3437         brelse(bh);
3438         return ret;
3439 }
3440
3441 /*
3442  * Move half of the xattrs in this cluster to the new cluster.
3443  * This function should only be called when bucket size == cluster size.
3444  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
3445  */
3446 static int ocfs2_half_xattr_cluster(struct inode *inode,
3447                                     handle_t *handle,
3448                                     u64 prev_blk,
3449                                     u64 new_blk,
3450                                     u32 *first_hash)
3451 {
3452         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3453         int ret, credits = 2 * blk_per_bucket;
3454
3455         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
3456
3457         ret = ocfs2_extend_trans(handle, credits);
3458         if (ret) {
3459                 mlog_errno(ret);
3460                 return ret;
3461         }
3462
3463         /* Move half of the xattr in start_blk to the next bucket. */
3464         return  ocfs2_half_xattr_bucket(inode, handle, prev_blk,
3465                                         new_blk, first_hash, 1);
3466 }
3467
3468 /*
3469  * Move some xattrs from the old cluster to the new one since they are not
3470  * contiguous in ocfs2 xattr tree.
3471  *
3472  * new_blk starts a new separate cluster, and we will move some xattrs from
3473  * prev_blk to it. v_start will be set as the first name hash value in this
3474  * new cluster so that it can be used as e_cpos during tree insertion and
3475  * don't collide with our original b-tree operations. first_bh and header_bh
3476  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
3477  * to extend the insert bucket.
3478  *
3479  * The problem is how much xattr should we move to the new one and when should
3480  * we update first_bh and header_bh?
3481  * 1. If cluster size > bucket size, that means the previous cluster has more
3482  *    than 1 bucket, so just move half nums of bucket into the new cluster and
3483  *    update the first_bh and header_bh if the insert bucket has been moved
3484  *    to the new cluster.
3485  * 2. If cluster_size == bucket_size:
3486  *    a) If the previous extent rec has more than one cluster and the insert
3487  *       place isn't in the last cluster, copy the entire last cluster to the
3488  *       new one. This time, we don't need to upate the first_bh and header_bh
3489  *       since they will not be moved into the new cluster.
3490  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
3491  *       the new one. And we set the extend flag to zero if the insert place is
3492  *       moved into the new allocated cluster since no extend is needed.
3493  */
3494 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
3495                                             handle_t *handle,
3496                                             struct buffer_head **first_bh,
3497                                             struct buffer_head **header_bh,
3498                                             u64 new_blk,
3499                                             u64 prev_blk,
3500                                             u32 prev_clusters,
3501                                             u32 *v_start,
3502                                             int *extend)
3503 {
3504         int ret = 0;
3505         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3506
3507         mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
3508              prev_blk, prev_clusters, new_blk);
3509
3510         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
3511                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
3512                                                           handle,
3513                                                           first_bh,
3514                                                           header_bh,
3515                                                           new_blk,
3516                                                           prev_blk,
3517                                                           prev_clusters,
3518                                                           v_start);
3519         else {
3520                 u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
3521
3522                 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
3523                         ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
3524                                                      last_blk, new_blk,
3525                                                      v_start);
3526                 else {
3527                         ret = ocfs2_half_xattr_cluster(inode, handle,
3528                                                        last_blk, new_blk,
3529                                                        v_start);
3530
3531                         if ((*header_bh)->b_blocknr == last_blk && extend)
3532                                 *extend = 0;
3533                 }
3534         }
3535
3536         return ret;
3537 }
3538
3539 /*
3540  * Add a new cluster for xattr storage.
3541  *
3542  * If the new cluster is contiguous with the previous one, it will be
3543  * appended to the same extent record, and num_clusters will be updated.
3544  * If not, we will insert a new extent for it and move some xattrs in
3545  * the last cluster into the new allocated one.
3546  * We also need to limit the maximum size of a btree leaf, otherwise we'll
3547  * lose the benefits of hashing because we'll have to search large leaves.
3548  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
3549  * if it's bigger).
3550  *
3551  * first_bh is the first block of the previous extent rec and header_bh
3552  * indicates the bucket we will insert the new xattrs. They will be updated
3553  * when the header_bh is moved into the new cluster.
3554  */
3555 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
3556                                        struct buffer_head *root_bh,
3557                                        struct buffer_head **first_bh,
3558                                        struct buffer_head **header_bh,
3559                                        u32 *num_clusters,
3560                                        u32 prev_cpos,
3561                                        u64 prev_blkno,
3562                                        int *extend)
3563 {
3564         int ret, credits;
3565         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3566         u32 prev_clusters = *num_clusters;
3567         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
3568         u64 block;
3569         handle_t *handle = NULL;
3570         struct ocfs2_alloc_context *data_ac = NULL;
3571         struct ocfs2_alloc_context *meta_ac = NULL;
3572         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3573         struct ocfs2_extent_tree et;
3574
3575         mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
3576              "previous xattr blkno = %llu\n",
3577              (unsigned long long)OCFS2_I(inode)->ip_blkno,
3578              prev_cpos, prev_blkno);
3579
3580         ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
3581
3582         ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
3583                                     &data_ac, &meta_ac);
3584         if (ret) {
3585                 mlog_errno(ret);
3586                 goto leave;
3587         }
3588
3589         credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
3590                                             clusters_to_add);
3591         handle = ocfs2_start_trans(osb, credits);
3592         if (IS_ERR(handle)) {
3593                 ret = PTR_ERR(handle);
3594                 handle = NULL;
3595                 mlog_errno(ret);
3596                 goto leave;
3597         }
3598
3599         ret = ocfs2_journal_access(handle, inode, root_bh,
3600                                    OCFS2_JOURNAL_ACCESS_WRITE);
3601         if (ret < 0) {
3602                 mlog_errno(ret);
3603                 goto leave;
3604         }
3605
3606         ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
3607                                      clusters_to_add, &bit_off, &num_bits);
3608         if (ret < 0) {
3609                 if (ret != -ENOSPC)
3610                         mlog_errno(ret);
3611                 goto leave;
3612         }
3613
3614         BUG_ON(num_bits > clusters_to_add);
3615
3616         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
3617         mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
3618              num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
3619
3620         if (prev_blkno + prev_clusters * bpc == block &&
3621             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
3622              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
3623                 /*
3624                  * If this cluster is contiguous with the old one and
3625                  * adding this new cluster, we don't surpass the limit of
3626                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
3627                  * initialized and used like other buckets in the previous
3628                  * cluster.
3629                  * So add it as a contiguous one. The caller will handle
3630                  * its init process.
3631                  */
3632                 v_start = prev_cpos + prev_clusters;
3633                 *num_clusters = prev_clusters + num_bits;
3634                 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
3635                      num_bits);
3636         } else {
3637                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
3638                                                        handle,
3639                                                        first_bh,
3640                                                        header_bh,
3641                                                        block,
3642                                                        prev_blkno,
3643                                                        prev_clusters,
3644                                                        &v_start,
3645                                                        extend);
3646                 if (ret) {
3647                         mlog_errno(ret);
3648                         goto leave;
3649                 }
3650         }
3651
3652         if (handle->h_buffer_credits < credits) {
3653                 /*
3654                  * The journal has been restarted before, and don't
3655                  * have enough space for the insertion, so extend it
3656                  * here.
3657                  */
3658                 ret = ocfs2_extend_trans(handle, credits);
3659                 if (ret) {
3660                         mlog_errno(ret);
3661                         goto leave;
3662                 }
3663         }
3664         mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
3665              num_bits, block, v_start);
3666         ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
3667                                   num_bits, 0, meta_ac);
3668         if (ret < 0) {
3669                 mlog_errno(ret);
3670                 goto leave;
3671         }
3672
3673         ret = ocfs2_journal_dirty(handle, root_bh);
3674         if (ret < 0) {
3675                 mlog_errno(ret);
3676                 goto leave;
3677         }
3678
3679 leave:
3680         if (handle)
3681                 ocfs2_commit_trans(osb, handle);
3682         if (data_ac)
3683                 ocfs2_free_alloc_context(data_ac);
3684         if (meta_ac)
3685                 ocfs2_free_alloc_context(meta_ac);
3686
3687         return ret;
3688 }
3689
3690 /*
3691  * Extend a new xattr bucket and move xattrs to the end one by one until
3692  * We meet with start_bh. Only move half of the xattrs to the bucket after it.
3693  */
3694 static int ocfs2_extend_xattr_bucket(struct inode *inode,
3695                                      struct buffer_head *first_bh,
3696                                      struct buffer_head *start_bh,
3697                                      u32 num_clusters)
3698 {
3699         int ret, credits;
3700         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3701         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3702         u64 start_blk = start_bh->b_blocknr, end_blk;
3703         u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
3704         handle_t *handle;
3705         struct ocfs2_xattr_header *first_xh =
3706                                 (struct ocfs2_xattr_header *)first_bh->b_data;
3707         u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
3708
3709         mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
3710              "from %llu, len = %u\n", start_blk,
3711              (unsigned long long)first_bh->b_blocknr, num_clusters);
3712
3713         BUG_ON(bucket >= num_buckets);
3714
3715         end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
3716
3717         /*
3718          * We will touch all the buckets after the start_bh(include it).
3719          * Add one more bucket and modify the first_bh.
3720          */
3721         credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
3722         handle = ocfs2_start_trans(osb, credits);
3723         if (IS_ERR(handle)) {
3724                 ret = PTR_ERR(handle);
3725                 handle = NULL;
3726                 mlog_errno(ret);
3727                 goto out;
3728         }
3729
3730         ret = ocfs2_journal_access(handle, inode, first_bh,
3731                                    OCFS2_JOURNAL_ACCESS_WRITE);
3732         if (ret) {
3733                 mlog_errno(ret);
3734                 goto commit;
3735         }
3736
3737         while (end_blk != start_blk) {
3738                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
3739                                             end_blk + blk_per_bucket, 0);
3740                 if (ret)
3741                         goto commit;
3742                 end_blk -= blk_per_bucket;
3743         }
3744
3745         /* Move half of the xattr in start_blk to the next bucket. */
3746         ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
3747                                       start_blk + blk_per_bucket, NULL, 0);
3748
3749         le16_add_cpu(&first_xh->xh_num_buckets, 1);
3750         ocfs2_journal_dirty(handle, first_bh);
3751
3752 commit:
3753         ocfs2_commit_trans(osb, handle);
3754 out:
3755         return ret;
3756 }
3757
3758 /*
3759  * Add new xattr bucket in an extent record and adjust the buckets accordingly.
3760  * xb_bh is the ocfs2_xattr_block.
3761  * We will move all the buckets starting from header_bh to the next place. As
3762  * for this one, half num of its xattrs will be moved to the next one.
3763  *
3764  * We will allocate a new cluster if current cluster is full and adjust
3765  * header_bh and first_bh if the insert place is moved to the new cluster.
3766  */
3767 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
3768                                       struct buffer_head *xb_bh,
3769                                       struct buffer_head *header_bh)
3770 {
3771         struct ocfs2_xattr_header *first_xh = NULL;
3772         struct buffer_head *first_bh = NULL;
3773         struct ocfs2_xattr_block *xb =
3774                         (struct ocfs2_xattr_block *)xb_bh->b_data;
3775         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3776         struct ocfs2_extent_list *el = &xb_root->xt_list;
3777         struct ocfs2_xattr_header *xh =
3778                         (struct ocfs2_xattr_header *)header_bh->b_data;
3779         u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3780         struct super_block *sb = inode->i_sb;
3781         struct ocfs2_super *osb = OCFS2_SB(sb);
3782         int ret, num_buckets, extend = 1;
3783         u64 p_blkno;
3784         u32 e_cpos, num_clusters;
3785
3786         mlog(0, "Add new xattr bucket starting form %llu\n",
3787              (unsigned long long)header_bh->b_blocknr);
3788
3789         /*
3790          * Add refrence for header_bh here because it may be
3791          * changed in ocfs2_add_new_xattr_cluster and we need
3792          * to free it in the end.
3793          */
3794         get_bh(header_bh);
3795
3796         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
3797                                   &num_clusters, el);
3798         if (ret) {
3799                 mlog_errno(ret);
3800                 goto out;
3801         }
3802
3803         ret = ocfs2_read_block(inode, p_blkno, &first_bh);
3804         if (ret) {
3805                 mlog_errno(ret);
3806                 goto out;
3807         }
3808
3809         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
3810         first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3811
3812         if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
3813                 ret = ocfs2_add_new_xattr_cluster(inode,
3814                                                   xb_bh,
3815                                                   &first_bh,
3816                                                   &header_bh,
3817                                                   &num_clusters,
3818                                                   e_cpos,
3819                                                   p_blkno,
3820                                                   &extend);
3821                 if (ret) {
3822                         mlog_errno(ret);
3823                         goto out;
3824                 }
3825         }
3826
3827         if (extend)
3828                 ret = ocfs2_extend_xattr_bucket(inode,
3829                                                 first_bh,
3830                                                 header_bh,
3831                                                 num_clusters);
3832         if (ret)
3833                 mlog_errno(ret);
3834 out:
3835         brelse(first_bh);
3836         brelse(header_bh);
3837         return ret;
3838 }
3839
3840 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
3841                                         struct ocfs2_xattr_bucket *bucket,
3842                                         int offs)
3843 {
3844         int block_off = offs >> inode->i_sb->s_blocksize_bits;
3845
3846         offs = offs % inode->i_sb->s_blocksize;
3847         return bucket->bhs[block_off]->b_data + offs;
3848 }
3849
3850 /*
3851  * Handle the normal xattr set, including replace, delete and new.
3852  *
3853  * Note: "local" indicates the real data's locality. So we can't
3854  * just its bucket locality by its length.
3855  */
3856 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
3857                                          struct ocfs2_xattr_info *xi,
3858                                          struct ocfs2_xattr_search *xs,
3859                                          u32 name_hash,
3860                                          int local)
3861 {
3862         struct ocfs2_xattr_entry *last, *xe;
3863         int name_len = strlen(xi->name);
3864         struct ocfs2_xattr_header *xh = xs->header;
3865         u16 count = le16_to_cpu(xh->xh_count), start;
3866         size_t blocksize = inode->i_sb->s_blocksize;
3867         char *val;
3868         size_t offs, size, new_size;
3869
3870         last = &xh->xh_entries[count];
3871         if (!xs->not_found) {
3872                 xe = xs->here;
3873                 offs = le16_to_cpu(xe->xe_name_offset);
3874                 if (ocfs2_xattr_is_local(xe))
3875                         size = OCFS2_XATTR_SIZE(name_len) +
3876                         OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3877                 else
3878                         size = OCFS2_XATTR_SIZE(name_len) +
3879                         OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
3880
3881                 /*
3882                  * If the new value will be stored outside, xi->value has been
3883                  * initalized as an empty ocfs2_xattr_value_root, and the same
3884                  * goes with xi->value_len, so we can set new_size safely here.
3885                  * See ocfs2_xattr_set_in_bucket.
3886                  */
3887                 new_size = OCFS2_XATTR_SIZE(name_len) +
3888                            OCFS2_XATTR_SIZE(xi->value_len);
3889
3890                 le16_add_cpu(&xh->xh_name_value_len, -size);
3891                 if (xi->value) {
3892                         if (new_size > size)
3893                                 goto set_new_name_value;
3894
3895                         /* Now replace the old value with new one. */
3896                         if (local)
3897                                 xe->xe_value_size = cpu_to_le64(xi->value_len);
3898                         else
3899                                 xe->xe_value_size = 0;
3900
3901                         val = ocfs2_xattr_bucket_get_val(inode,
3902                                                          &xs->bucket, offs);
3903                         memset(val + OCFS2_XATTR_SIZE(name_len), 0,
3904                                size - OCFS2_XATTR_SIZE(name_len));
3905                         if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
3906                                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
3907                                        xi->value, xi->value_len);
3908
3909                         le16_add_cpu(&xh->xh_name_value_len, new_size);
3910                         ocfs2_xattr_set_local(xe, local);
3911                         return;
3912                 } else {
3913                         /*
3914                          * Remove the old entry if there is more than one.
3915                          * We don't remove the last entry so that we can
3916                          * use it to indicate the hash value of the empty
3917                          * bucket.
3918                          */
3919                         last -= 1;
3920                         le16_add_cpu(&xh->xh_count, -1);
3921                         if (xh->xh_count) {
3922                                 memmove(xe, xe + 1,
3923                                         (void *)last - (void *)xe);
3924                                 memset(last, 0,
3925                                        sizeof(struct ocfs2_xattr_entry));
3926                         } else
3927                                 xh->xh_free_start =
3928                                         cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3929
3930                         return;
3931                 }
3932         } else {
3933                 /* find a new entry for insert. */
3934                 int low = 0, high = count - 1, tmp;
3935                 struct ocfs2_xattr_entry *tmp_xe;
3936
3937                 while (low <= high && count) {
3938                         tmp = (low + high) / 2;
3939                         tmp_xe = &xh->xh_entries[tmp];
3940
3941                         if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
3942                                 low = tmp + 1;
3943                         else if (name_hash <
3944                                  le32_to_cpu(tmp_xe->xe_name_hash))
3945                                 high = tmp - 1;
3946                         else {
3947                                 low = tmp;
3948                                 break;
3949                         }
3950                 }
3951
3952                 xe = &xh->xh_entries[low];
3953                 if (low != count)
3954                         memmove(xe + 1, xe, (void *)last - (void *)xe);
3955
3956                 le16_add_cpu(&xh->xh_count, 1);
3957                 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
3958                 xe->xe_name_hash = cpu_to_le32(name_hash);
3959                 xe->xe_name_len = name_len;
3960                 ocfs2_xattr_set_type(xe, xi->name_index);
3961         }
3962
3963 set_new_name_value:
3964         /* Insert the new name+value. */
3965         size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
3966
3967         /*
3968          * We must make sure that the name/value pair
3969          * exists in the same block.
3970          */
3971         offs = le16_to_cpu(xh->xh_free_start);
3972         start = offs - size;
3973
3974         if (start >> inode->i_sb->s_blocksize_bits !=
3975             (offs - 1) >> inode->i_sb->s_blocksize_bits) {
3976                 offs = offs - offs % blocksize;
3977                 xh->xh_free_start = cpu_to_le16(offs);
3978         }
3979
3980         val = ocfs2_xattr_bucket_get_val(inode,
3981                                          &xs->bucket, offs - size);
3982         xe->xe_name_offset = cpu_to_le16(offs - size);
3983
3984         memset(val, 0, size);
3985         memcpy(val, xi->name, name_len);
3986         memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
3987
3988         xe->xe_value_size = cpu_to_le64(xi->value_len);
3989         ocfs2_xattr_set_local(xe, local);
3990         xs->here = xe;
3991         le16_add_cpu(&xh->xh_free_start, -size);
3992         le16_add_cpu(&xh->xh_name_value_len, size);
3993
3994         return;
3995 }
3996
3997 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
3998                                              handle_t *handle,
3999                                              struct ocfs2_xattr_search *xs,
4000                                              struct buffer_head **bhs,
4001                                              u16 bh_num)
4002 {
4003         int ret = 0, off, block_off;
4004         struct ocfs2_xattr_entry *xe = xs->here;
4005
4006         /*
4007          * First calculate all the blocks we should journal_access
4008          * and journal_dirty. The first block should always be touched.
4009          */
4010         ret = ocfs2_journal_dirty(handle, bhs[0]);
4011         if (ret)
4012                 mlog_errno(ret);
4013
4014         /* calc the data. */
4015         off = le16_to_cpu(xe->xe_name_offset);
4016         block_off = off >> inode->i_sb->s_blocksize_bits;
4017         ret = ocfs2_journal_dirty(handle, bhs[block_off]);
4018         if (ret)
4019                 mlog_errno(ret);
4020
4021         return ret;
4022 }
4023
4024 /*
4025  * Set the xattr entry in the specified bucket.
4026  * The bucket is indicated by xs->bucket and it should have the enough
4027  * space for the xattr insertion.
4028  */
4029 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4030                                            struct ocfs2_xattr_info *xi,
4031                                            struct ocfs2_xattr_search *xs,
4032                                            u32 name_hash,
4033                                            int local)
4034 {
4035         int i, ret;
4036         handle_t *handle = NULL;
4037         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4038         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4039
4040         mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4041              (unsigned long)xi->value_len, xi->name_index,
4042              (unsigned long long)xs->bucket.bhs[0]->b_blocknr);
4043
4044         if (!xs->bucket.bhs[1]) {
4045                 ret = ocfs2_read_blocks(inode,
4046                                         xs->bucket.bhs[0]->b_blocknr + 1,
4047                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
4048                                         0);
4049                 if (ret) {
4050                         mlog_errno(ret);
4051                         goto out;
4052                 }
4053         }
4054
4055         handle = ocfs2_start_trans(osb, blk_per_bucket);
4056         if (IS_ERR(handle)) {
4057                 ret = PTR_ERR(handle);
4058                 handle = NULL;
4059                 mlog_errno(ret);
4060                 goto out;
4061         }
4062
4063         for (i = 0; i < blk_per_bucket; i++) {
4064                 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
4065                                            OCFS2_JOURNAL_ACCESS_WRITE);
4066                 if (ret < 0) {
4067                         mlog_errno(ret);
4068                         goto out;
4069                 }
4070         }
4071
4072         ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4073
4074         /*Only dirty the blocks we have touched in set xattr. */
4075         ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
4076                                                 xs->bucket.bhs, blk_per_bucket);
4077         if (ret)
4078                 mlog_errno(ret);
4079 out:
4080         ocfs2_commit_trans(osb, handle);
4081
4082         return ret;
4083 }
4084
4085 static int ocfs2_xattr_value_update_size(struct inode *inode,
4086                                          struct buffer_head *xe_bh,
4087                                          struct ocfs2_xattr_entry *xe,
4088                                          u64 new_size)
4089 {
4090         int ret;
4091         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4092         handle_t *handle = NULL;
4093
4094         handle = ocfs2_start_trans(osb, 1);
4095         if (IS_ERR(handle)) {
4096                 ret = -ENOMEM;
4097                 mlog_errno(ret);
4098                 goto out;
4099         }
4100
4101         ret = ocfs2_journal_access(handle, inode, xe_bh,
4102                                    OCFS2_JOURNAL_ACCESS_WRITE);
4103         if (ret < 0) {
4104                 mlog_errno(ret);
4105                 goto out_commit;
4106         }
4107
4108         xe->xe_value_size = cpu_to_le64(new_size);
4109
4110         ret = ocfs2_journal_dirty(handle, xe_bh);
4111         if (ret < 0)
4112                 mlog_errno(ret);
4113
4114 out_commit:
4115         ocfs2_commit_trans(osb, handle);
4116 out:
4117         return ret;
4118 }
4119
4120 /*
4121  * Truncate the specified xe_off entry in xattr bucket.
4122  * bucket is indicated by header_bh and len is the new length.
4123  * Both the ocfs2_xattr_value_root and the entry will be updated here.
4124  *
4125  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4126  */
4127 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4128                                              struct buffer_head *header_bh,
4129                                              int xe_off,
4130                                              int len)
4131 {
4132         int ret, offset;
4133         u64 value_blk;
4134         struct buffer_head *value_bh = NULL;
4135         struct ocfs2_xattr_value_root *xv;
4136         struct ocfs2_xattr_entry *xe;
4137         struct ocfs2_xattr_header *xh =
4138                         (struct ocfs2_xattr_header *)header_bh->b_data;
4139         size_t blocksize = inode->i_sb->s_blocksize;
4140
4141         xe = &xh->xh_entries[xe_off];
4142
4143         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4144
4145         offset = le16_to_cpu(xe->xe_name_offset) +
4146                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4147
4148         value_blk = offset / blocksize;
4149
4150         /* We don't allow ocfs2_xattr_value to be stored in different block. */
4151         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4152         value_blk += header_bh->b_blocknr;
4153
4154         ret = ocfs2_read_block(inode, value_blk, &value_bh);
4155         if (ret) {
4156                 mlog_errno(ret);
4157                 goto out;
4158         }
4159
4160         xv = (struct ocfs2_xattr_value_root *)
4161                 (value_bh->b_data + offset % blocksize);
4162
4163         mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4164              xe_off, (unsigned long long)header_bh->b_blocknr, len);
4165         ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
4166         if (ret) {
4167                 mlog_errno(ret);
4168                 goto out;
4169         }
4170
4171         ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
4172         if (ret) {
4173                 mlog_errno(ret);
4174                 goto out;
4175         }
4176
4177 out:
4178         brelse(value_bh);
4179         return ret;
4180 }
4181
4182 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4183                                                 struct ocfs2_xattr_search *xs,
4184                                                 int len)
4185 {
4186         int ret, offset;
4187         struct ocfs2_xattr_entry *xe = xs->here;
4188         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4189
4190         BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4191
4192         offset = xe - xh->xh_entries;
4193         ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
4194                                                 offset, len);
4195         if (ret)
4196                 mlog_errno(ret);
4197
4198         return ret;
4199 }
4200
4201 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4202                                                 struct ocfs2_xattr_search *xs,
4203                                                 char *val,
4204                                                 int value_len)
4205 {
4206         int offset;
4207         struct ocfs2_xattr_value_root *xv;
4208         struct ocfs2_xattr_entry *xe = xs->here;
4209
4210         BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4211
4212         offset = le16_to_cpu(xe->xe_name_offset) +
4213                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4214
4215         xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
4216
4217         return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
4218 }
4219
4220 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4221                                   struct buffer_head *root_bh,
4222                                   u64 blkno,
4223                                   u32 cpos,
4224                                   u32 len)
4225 {
4226         int ret;
4227         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4228         struct inode *tl_inode = osb->osb_tl_inode;
4229         handle_t *handle;
4230         struct ocfs2_xattr_block *xb =
4231                         (struct ocfs2_xattr_block *)root_bh->b_data;
4232         struct ocfs2_alloc_context *meta_ac = NULL;
4233         struct ocfs2_cached_dealloc_ctxt dealloc;
4234         struct ocfs2_extent_tree et;
4235
4236         ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
4237
4238         ocfs2_init_dealloc_ctxt(&dealloc);
4239
4240         mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4241              cpos, len, (unsigned long long)blkno);
4242
4243         ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4244
4245         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4246         if (ret) {
4247                 mlog_errno(ret);
4248                 return ret;
4249         }
4250
4251         mutex_lock(&tl_inode->i_mutex);
4252
4253         if (ocfs2_truncate_log_needs_flush(osb)) {
4254                 ret = __ocfs2_flush_truncate_log(osb);
4255                 if (ret < 0) {
4256                         mlog_errno(ret);
4257                         goto out;
4258                 }
4259         }
4260
4261         handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
4262         if (IS_ERR(handle)) {
4263                 ret = -ENOMEM;
4264                 mlog_errno(ret);
4265                 goto out;
4266         }
4267
4268         ret = ocfs2_journal_access(handle, inode, root_bh,
4269                                    OCFS2_JOURNAL_ACCESS_WRITE);
4270         if (ret) {
4271                 mlog_errno(ret);
4272                 goto out_commit;
4273         }
4274
4275         ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
4276                                   &dealloc);
4277         if (ret) {
4278                 mlog_errno(ret);
4279                 goto out_commit;
4280         }
4281
4282         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4283
4284         ret = ocfs2_journal_dirty(handle, root_bh);
4285         if (ret) {
4286                 mlog_errno(ret);
4287                 goto out_commit;
4288         }
4289
4290         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4291         if (ret)
4292                 mlog_errno(ret);
4293
4294 out_commit:
4295         ocfs2_commit_trans(osb, handle);
4296 out:
4297         ocfs2_schedule_truncate_log_flush(osb, 1);
4298
4299         mutex_unlock(&tl_inode->i_mutex);
4300
4301         if (meta_ac)
4302                 ocfs2_free_alloc_context(meta_ac);
4303
4304         ocfs2_run_deallocs(osb, &dealloc);
4305
4306         return ret;
4307 }
4308
4309 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4310                                          struct ocfs2_xattr_search *xs)
4311 {
4312         handle_t *handle = NULL;
4313         struct ocfs2_xattr_header *xh = xs->bucket.xh;
4314         struct ocfs2_xattr_entry *last = &xh->xh_entries[
4315                                                 le16_to_cpu(xh->xh_count) - 1];
4316         int ret = 0;
4317
4318         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
4319         if (IS_ERR(handle)) {
4320                 ret = PTR_ERR(handle);
4321                 mlog_errno(ret);
4322                 return;
4323         }
4324
4325         ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
4326                                    OCFS2_JOURNAL_ACCESS_WRITE);
4327         if (ret) {
4328                 mlog_errno(ret);
4329                 goto out_commit;
4330         }
4331
4332         /* Remove the old entry. */
4333         memmove(xs->here, xs->here + 1,
4334                 (void *)last - (void *)xs->here);
4335         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4336         le16_add_cpu(&xh->xh_count, -1);
4337
4338         ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
4339         if (ret < 0)
4340                 mlog_errno(ret);
4341 out_commit:
4342         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
4343 }
4344
4345 /*
4346  * Set the xattr name/value in the bucket specified in xs.
4347  *
4348  * As the new value in xi may be stored in the bucket or in an outside cluster,
4349  * we divide the whole process into 3 steps:
4350  * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4351  * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4352  * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4353  * 4. If the clusters for the new outside value can't be allocated, we need
4354  *    to free the xattr we allocated in set.
4355  */
4356 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4357                                      struct ocfs2_xattr_info *xi,
4358                                      struct ocfs2_xattr_search *xs)
4359 {
4360         int ret, local = 1;
4361         size_t value_len;
4362         char *val = (char *)xi->value;
4363         struct ocfs2_xattr_entry *xe = xs->here;
4364         u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
4365                                               strlen(xi->name));
4366
4367         if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4368                 /*
4369                  * We need to truncate the xattr storage first.
4370                  *
4371                  * If both the old and new value are stored to
4372                  * outside block, we only need to truncate
4373                  * the storage and then set the value outside.
4374                  *
4375                  * If the new value should be stored within block,
4376                  * we should free all the outside block first and
4377                  * the modification to the xattr block will be done
4378                  * by following steps.
4379                  */
4380                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4381                         value_len = xi->value_len;
4382                 else
4383                         value_len = 0;
4384
4385                 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4386                                                            value_len);
4387                 if (ret)
4388                         goto out;
4389
4390                 if (value_len)
4391                         goto set_value_outside;
4392         }
4393
4394         value_len = xi->value_len;
4395         /* So we have to handle the inside block change now. */
4396         if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4397                 /*
4398                  * If the new value will be stored outside of block,
4399                  * initalize a new empty value root and insert it first.
4400                  */
4401                 local = 0;
4402                 xi->value = &def_xv;
4403                 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4404         }
4405
4406         ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local);
4407         if (ret) {
4408                 mlog_errno(ret);
4409                 goto out;
4410         }
4411
4412         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
4413                 goto out;
4414
4415         /* allocate the space now for the outside block storage. */
4416         ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4417                                                    value_len);
4418         if (ret) {
4419                 mlog_errno(ret);
4420
4421                 if (xs->not_found) {
4422                         /*
4423                          * We can't allocate enough clusters for outside
4424                          * storage and we have allocated xattr already,
4425                          * so need to remove it.
4426                          */
4427                         ocfs2_xattr_bucket_remove_xs(inode, xs);
4428                 }
4429                 goto out;
4430         }
4431
4432 set_value_outside:
4433         ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
4434 out:
4435         return ret;
4436 }
4437
4438 /* check whether the xattr bucket is filled up with the same hash value. */
4439 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
4440                                               struct ocfs2_xattr_bucket *bucket)
4441 {
4442         struct ocfs2_xattr_header *xh = bucket->xh;
4443
4444         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
4445             xh->xh_entries[0].xe_name_hash) {
4446                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
4447                      "hash = %u\n",
4448                      (unsigned long long)bucket->bhs[0]->b_blocknr,
4449                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
4450                 return -ENOSPC;
4451         }
4452
4453         return 0;
4454 }
4455
4456 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
4457                                              struct ocfs2_xattr_info *xi,
4458                                              struct ocfs2_xattr_search *xs)
4459 {
4460         struct ocfs2_xattr_header *xh;
4461         struct ocfs2_xattr_entry *xe;
4462         u16 count, header_size, xh_free_start;
4463         int i, free, max_free, need, old;
4464         size_t value_size = 0, name_len = strlen(xi->name);
4465         size_t blocksize = inode->i_sb->s_blocksize;
4466         int ret, allocation = 0;
4467         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4468
4469         mlog_entry("Set xattr %s in xattr index block\n", xi->name);
4470
4471 try_again:
4472         xh = xs->header;
4473         count = le16_to_cpu(xh->xh_count);
4474         xh_free_start = le16_to_cpu(xh->xh_free_start);
4475         header_size = sizeof(struct ocfs2_xattr_header) +
4476                         count * sizeof(struct ocfs2_xattr_entry);
4477         max_free = OCFS2_XATTR_BUCKET_SIZE -
4478                 le16_to_cpu(xh->xh_name_value_len) - header_size;
4479
4480         mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
4481                         "of %u which exceed block size\n",
4482                         (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4483                         header_size);
4484
4485         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4486                 value_size = OCFS2_XATTR_ROOT_SIZE;
4487         else if (xi->value)
4488                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
4489
4490         if (xs->not_found)
4491                 need = sizeof(struct ocfs2_xattr_entry) +
4492                         OCFS2_XATTR_SIZE(name_len) + value_size;
4493         else {
4494                 need = value_size + OCFS2_XATTR_SIZE(name_len);
4495
4496                 /*
4497                  * We only replace the old value if the new length is smaller
4498                  * than the old one. Otherwise we will allocate new space in the
4499                  * bucket to store it.
4500                  */
4501                 xe = xs->here;
4502                 if (ocfs2_xattr_is_local(xe))
4503                         old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4504                 else
4505                         old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4506
4507                 if (old >= value_size)
4508                         need = 0;
4509         }
4510
4511         free = xh_free_start - header_size;
4512         /*
4513          * We need to make sure the new name/value pair
4514          * can exist in the same block.
4515          */
4516         if (xh_free_start % blocksize < need)
4517                 free -= xh_free_start % blocksize;
4518
4519         mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
4520              "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
4521              " %u\n", xs->not_found,
4522              (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4523              free, need, max_free, le16_to_cpu(xh->xh_free_start),
4524              le16_to_cpu(xh->xh_name_value_len));
4525
4526         if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4527                 if (need <= max_free &&
4528                     count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4529                         /*
4530                          * We can create the space by defragment. Since only the
4531                          * name/value will be moved, the xe shouldn't be changed
4532                          * in xs.
4533                          */
4534                         ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
4535                         if (ret) {
4536                                 mlog_errno(ret);
4537                                 goto out;
4538                         }
4539
4540                         xh_free_start = le16_to_cpu(xh->xh_free_start);
4541                         free = xh_free_start - header_size;
4542                         if (xh_free_start % blocksize < need)
4543                                 free -= xh_free_start % blocksize;
4544
4545                         if (free >= need)
4546                                 goto xattr_set;
4547
4548                         mlog(0, "Can't get enough space for xattr insert by "
4549                              "defragment. Need %u bytes, but we have %d, so "
4550                              "allocate new bucket for it.\n", need, free);
4551                 }
4552
4553                 /*
4554                  * We have to add new buckets or clusters and one
4555                  * allocation should leave us enough space for insert.
4556                  */
4557                 BUG_ON(allocation);
4558
4559                 /*
4560                  * We do not allow for overlapping ranges between buckets. And
4561                  * the maximum number of collisions we will allow for then is
4562                  * one bucket's worth, so check it here whether we need to
4563                  * add a new bucket for the insert.
4564                  */
4565                 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
4566                 if (ret) {
4567                         mlog_errno(ret);
4568                         goto out;
4569                 }
4570
4571                 ret = ocfs2_add_new_xattr_bucket(inode,
4572                                                  xs->xattr_bh,
4573                                                  xs->bucket.bhs[0]);
4574                 if (ret) {
4575                         mlog_errno(ret);
4576                         goto out;
4577                 }
4578
4579                 for (i = 0; i < blk_per_bucket; i++)
4580                         brelse(xs->bucket.bhs[i]);
4581
4582                 memset(&xs->bucket, 0, sizeof(xs->bucket));
4583
4584                 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
4585                                                    xi->name_index,
4586                                                    xi->name, xs);
4587                 if (ret && ret != -ENODATA)
4588                         goto out;
4589                 xs->not_found = ret;
4590                 allocation = 1;
4591                 goto try_again;
4592         }
4593
4594 xattr_set:
4595         ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
4596 out:
4597         mlog_exit(ret);
4598         return ret;
4599 }
4600
4601 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
4602                                         struct ocfs2_xattr_bucket *bucket,
4603                                         void *para)
4604 {
4605         int ret = 0;
4606         struct ocfs2_xattr_header *xh = bucket->xh;
4607         u16 i;
4608         struct ocfs2_xattr_entry *xe;
4609
4610         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4611                 xe = &xh->xh_entries[i];
4612                 if (ocfs2_xattr_is_local(xe))
4613                         continue;
4614
4615                 ret = ocfs2_xattr_bucket_value_truncate(inode,
4616                                                         bucket->bhs[0],
4617                                                         i, 0);
4618                 if (ret) {
4619                         mlog_errno(ret);
4620                         break;
4621                 }
4622         }
4623
4624         return ret;
4625 }
4626
4627 static int ocfs2_delete_xattr_index_block(struct inode *inode,
4628                                           struct buffer_head *xb_bh)
4629 {
4630         struct ocfs2_xattr_block *xb =
4631                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4632         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4633         int ret = 0;
4634         u32 name_hash = UINT_MAX, e_cpos, num_clusters;
4635         u64 p_blkno;
4636
4637         if (le16_to_cpu(el->l_next_free_rec) == 0)
4638                 return 0;
4639
4640         while (name_hash > 0) {
4641                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4642                                           &e_cpos, &num_clusters, el);
4643                 if (ret) {
4644                         mlog_errno(ret);
4645                         goto out;
4646                 }
4647
4648                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
4649                                                   ocfs2_delete_xattr_in_bucket,
4650                                                   NULL);
4651                 if (ret) {
4652                         mlog_errno(ret);
4653                         goto out;
4654                 }
4655
4656                 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
4657                                              p_blkno, e_cpos, num_clusters);
4658                 if (ret) {
4659                         mlog_errno(ret);
4660                         break;
4661                 }
4662
4663                 if (e_cpos == 0)
4664                         break;
4665
4666                 name_hash = e_cpos - 1;
4667         }
4668
4669 out:
4670         return ret;
4671 }
4672
4673 /*
4674  * 'trusted' attributes support
4675  */
4676 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
4677                                        size_t list_size, const char *name,
4678                                        size_t name_len)
4679 {
4680         const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
4681         const size_t total_len = prefix_len + name_len + 1;
4682
4683         if (list && total_len <= list_size) {
4684                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
4685                 memcpy(list + prefix_len, name, name_len);
4686                 list[prefix_len + name_len] = '\0';
4687         }
4688         return total_len;
4689 }
4690
4691 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
4692                                    void *buffer, size_t size)
4693 {
4694         if (strcmp(name, "") == 0)
4695                 return -EINVAL;
4696         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
4697                                buffer, size);
4698 }
4699
4700 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
4701                                    const void *value, size_t size, int flags)
4702 {
4703         if (strcmp(name, "") == 0)
4704                 return -EINVAL;
4705
4706         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
4707                                size, flags);
4708 }
4709
4710 struct xattr_handler ocfs2_xattr_trusted_handler = {
4711         .prefix = XATTR_TRUSTED_PREFIX,
4712         .list   = ocfs2_xattr_trusted_list,
4713         .get    = ocfs2_xattr_trusted_get,
4714         .set    = ocfs2_xattr_trusted_set,
4715 };
4716
4717 /*
4718  * 'user' attributes support
4719  */
4720 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
4721                                     size_t list_size, const char *name,
4722                                     size_t name_len)
4723 {
4724         const size_t prefix_len = XATTR_USER_PREFIX_LEN;
4725         const size_t total_len = prefix_len + name_len + 1;
4726         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4727
4728         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4729                 return 0;
4730
4731         if (list && total_len <= list_size) {
4732                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
4733                 memcpy(list + prefix_len, name, name_len);
4734                 list[prefix_len + name_len] = '\0';
4735         }
4736         return total_len;
4737 }
4738
4739 static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
4740                                 void *buffer, size_t size)
4741 {
4742         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4743
4744         if (strcmp(name, "") == 0)
4745                 return -EINVAL;
4746         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4747                 return -EOPNOTSUPP;
4748         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
4749                                buffer, size);
4750 }
4751
4752 static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
4753                                 const void *value, size_t size, int flags)
4754 {
4755         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4756
4757         if (strcmp(name, "") == 0)
4758                 return -EINVAL;
4759         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
4760                 return -EOPNOTSUPP;
4761
4762         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
4763                                size, flags);
4764 }
4765
4766 struct xattr_handler ocfs2_xattr_user_handler = {
4767         .prefix = XATTR_USER_PREFIX,
4768         .list   = ocfs2_xattr_user_list,
4769         .get    = ocfs2_xattr_user_get,
4770         .set    = ocfs2_xattr_user_set,
4771 };