fs/ocfs2/xattr.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * xattr.c
   5  *
   6  * Copyright (C) 2008 Oracle.  All rights reserved.
   7  *
   8  * CREDITS:
   9  * Lots of code in this file is taken from ext3.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2 of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public
  22  * License along with this program; if not, write to the
  23  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24  * Boston, MA 021110-1307, USA.
  25  */
  26
  27 #include <linux/capability.h>
  28 #include <linux/fs.h>
  29 #include <linux/types.h>
  30 #include <linux/slab.h>
  31 #include <linux/highmem.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/uio.h>
  34 #include <linux/sched.h>
  35 #include <linux/splice.h>
  36 #include <linux/mount.h>
  37 #include <linux/writeback.h>
  38 #include <linux/falloc.h>
  39 #include <linux/sort.h>
  40
  41 #define MLOG_MASK_PREFIX ML_XATTR
  42 #include <cluster/masklog.h>
  43
  44 #include "ocfs2.h"
  45 #include "alloc.h"
  46 #include "dlmglue.h"
  47 #include "file.h"
  48 #include "symlink.h"
  49 #include "sysfile.h"
  50 #include "inode.h"
  51 #include "journal.h"
  52 #include "ocfs2_fs.h"
  53 #include "suballoc.h"
  54 #include "uptodate.h"
  55 #include "buffer_head_io.h"
  56 #include "super.h"
  57 #include "xattr.h"
  58
  59
  60 struct ocfs2_xattr_def_value_root {
  61         struct ocfs2_xattr_value_root   xv;
  62         struct ocfs2_extent_rec         er;
  63 };
  64
  65 struct ocfs2_xattr_bucket {
  66         struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
  67         struct ocfs2_xattr_header *xh;
  68 };
  69
  70 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
  71 #define OCFS2_XATTR_INLINE_SIZE 80
  72
  73 static struct ocfs2_xattr_def_value_root def_xv = {
  74         .xv.xr_list.l_count = cpu_to_le16(1),
  75 };
  76
  77 struct xattr_handler *ocfs2_xattr_handlers[] = {
  78         &ocfs2_xattr_user_handler,
  79         &ocfs2_xattr_trusted_handler,
  80         NULL
  81 };
  82
  83 static struct xattr_handler *ocfs2_xattr_handler_map[] = {
  84         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
  85         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
  86 };
  87
  88 struct ocfs2_xattr_info {
  89         int name_index;
  90         const char *name;
  91         const void *value;
  92         size_t value_len;
  93 };
  94
  95 struct ocfs2_xattr_search {
  96         struct buffer_head *inode_bh;
  97         /*
  98          * xattr_bh point to the block buffer head which has extended attribute
  99          * when extended attribute in inode, xattr_bh is equal to inode_bh.
 100          */
 101         struct buffer_head *xattr_bh;
 102         struct ocfs2_xattr_header *header;
 103         struct ocfs2_xattr_bucket bucket;
 104         void *base;
 105         void *end;
 106         struct ocfs2_xattr_entry *here;
 107         int not_found;
 108 };
 109
 110 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
 111                                              struct ocfs2_xattr_header *xh,
 112                                              int index,
 113                                              int *block_off,
 114                                              int *new_offset);
 115
 116 static int ocfs2_xattr_index_block_find(struct inode *inode,
 117                                         struct buffer_head *root_bh,
 118                                         int name_index,
 119                                         const char *name,
 120                                         struct ocfs2_xattr_search *xs);
 121
 122 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
 123                                         struct ocfs2_xattr_tree_root *xt,
 124                                         char *buffer,
 125                                         size_t buffer_size);
 126
 127 static int ocfs2_xattr_create_index_block(struct inode *inode,
 128                                           struct ocfs2_xattr_search *xs);
 129
 130 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
 131                                              struct ocfs2_xattr_info *xi,
 132                                              struct ocfs2_xattr_search *xs);
 133
 134 static inline struct xattr_handler *ocfs2_xattr_handler(int name_index)
 135 {
 136         struct xattr_handler *handler = NULL;
 137
 138         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
 139                 handler = ocfs2_xattr_handler_map[name_index];
 140
 141         return handler;
 142 }
 143
 144 static inline u32 ocfs2_xattr_name_hash(struct inode *inode,
 145                                         char *prefix,
 146                                         int prefix_len,
 147                                         char *name,
 148                                         int name_len)
 149 {
 150         /* Get hash value of uuid from super block */
 151         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
 152         int i;
 153
 154         /* hash extended attribute prefix */
 155         for (i = 0; i < prefix_len; i++) {
 156                 hash = (hash << OCFS2_HASH_SHIFT) ^
 157                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 158                        *prefix++;
 159         }
 160         /* hash extended attribute name */
 161         for (i = 0; i < name_len; i++) {
 162                 hash = (hash << OCFS2_HASH_SHIFT) ^
 163                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 164                        *name++;
 165         }
 166
 167         return hash;
 168 }
 169
 170 /*
 171  * ocfs2_xattr_hash_entry()
 172  *
 173  * Compute the hash of an extended attribute.
 174  */
 175 static void ocfs2_xattr_hash_entry(struct inode *inode,
 176                                    struct ocfs2_xattr_header *header,
 177                                    struct ocfs2_xattr_entry *entry)
 178 {
 179         u32 hash = 0;
 180         struct xattr_handler *handler =
 181                         ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
 182         char *prefix = handler->prefix;
 183         char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
 184         int prefix_len = strlen(handler->prefix);
 185
 186         hash = ocfs2_xattr_name_hash(inode, prefix, prefix_len, name,
 187                                      entry->xe_name_len);
 188         entry->xe_name_hash = cpu_to_le32(hash);
 189
 190         return;
 191 }
 192
 193 static int ocfs2_xattr_extend_allocation(struct inode *inode,
 194                                          u32 clusters_to_add,
 195                                          struct buffer_head *xattr_bh,
 196                                          struct ocfs2_xattr_value_root *xv)
 197 {
 198         int status = 0;
 199         int restart_func = 0;
 200         int credits = 0;
 201         handle_t *handle = NULL;
 202         struct ocfs2_alloc_context *data_ac = NULL;
 203         struct ocfs2_alloc_context *meta_ac = NULL;
 204         enum ocfs2_alloc_restarted why;
 205         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 206         struct ocfs2_extent_list *root_el = &xv->xr_list;
 207         u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
 208
 209         mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
 210
 211 restart_all:
 212
 213         status = ocfs2_lock_allocators(inode, xattr_bh, root_el,
 214                                        clusters_to_add, 0, &data_ac,
 215                                        &meta_ac, OCFS2_XATTR_VALUE_EXTENT, xv);
 216         if (status) {
 217                 mlog_errno(status);
 218                 goto leave;
 219         }
 220
 221         credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add);
 222         handle = ocfs2_start_trans(osb, credits);
 223         if (IS_ERR(handle)) {
 224                 status = PTR_ERR(handle);
 225                 handle = NULL;
 226                 mlog_errno(status);
 227                 goto leave;
 228         }
 229
 230 restarted_transaction:
 231         status = ocfs2_journal_access(handle, inode, xattr_bh,
 232                                       OCFS2_JOURNAL_ACCESS_WRITE);
 233         if (status < 0) {
 234                 mlog_errno(status);
 235                 goto leave;
 236         }
 237
 238         prev_clusters = le32_to_cpu(xv->xr_clusters);
 239         status = ocfs2_add_clusters_in_btree(osb,
 240                                              inode,
 241                                              &logical_start,
 242                                              clusters_to_add,
 243                                              0,
 244                                              xattr_bh,
 245                                              root_el,
 246                                              handle,
 247                                              data_ac,
 248                                              meta_ac,
 249                                              &why,
 250                                              OCFS2_XATTR_VALUE_EXTENT,
 251                                              xv);
 252         if ((status < 0) && (status != -EAGAIN)) {
 253                 if (status != -ENOSPC)
 254                         mlog_errno(status);
 255                 goto leave;
 256         }
 257
 258         status = ocfs2_journal_dirty(handle, xattr_bh);
 259         if (status < 0) {
 260                 mlog_errno(status);
 261                 goto leave;
 262         }
 263
 264         clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
 265
 266         if (why != RESTART_NONE && clusters_to_add) {
 267                 if (why == RESTART_META) {
 268                         mlog(0, "restarting function.\n");
 269                         restart_func = 1;
 270                 } else {
 271                         BUG_ON(why != RESTART_TRANS);
 272
 273                         mlog(0, "restarting transaction.\n");
 274                         /* TODO: This can be more intelligent. */
 275                         credits = ocfs2_calc_extend_credits(osb->sb,
 276                                                             root_el,
 277                                                             clusters_to_add);
 278                         status = ocfs2_extend_trans(handle, credits);
 279                         if (status < 0) {
 280                                 /* handle still has to be committed at
 281                                  * this point. */
 282                                 status = -ENOMEM;
 283                                 mlog_errno(status);
 284                                 goto leave;
 285                         }
 286                         goto restarted_transaction;
 287                 }
 288         }
 289
 290 leave:
 291         if (handle) {
 292                 ocfs2_commit_trans(osb, handle);
 293                 handle = NULL;
 294         }
 295         if (data_ac) {
 296                 ocfs2_free_alloc_context(data_ac);
 297                 data_ac = NULL;
 298         }
 299         if (meta_ac) {
 300                 ocfs2_free_alloc_context(meta_ac);
 301                 meta_ac = NULL;
 302         }
 303         if ((!status) && restart_func) {
 304                 restart_func = 0;
 305                 goto restart_all;
 306         }
 307
 308         return status;
 309 }
 310
 311 static int __ocfs2_remove_xattr_range(struct inode *inode,
 312                                       struct buffer_head *root_bh,
 313                                       struct ocfs2_xattr_value_root *xv,
 314                                       u32 cpos, u32 phys_cpos, u32 len,
 315                                       struct ocfs2_cached_dealloc_ctxt *dealloc)
 316 {
 317         int ret;
 318         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 319         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 320         struct inode *tl_inode = osb->osb_tl_inode;
 321         handle_t *handle;
 322         struct ocfs2_alloc_context *meta_ac = NULL;
 323
 324         ret = ocfs2_lock_allocators(inode, root_bh, &xv->xr_list,
 325                                     0, 1, NULL, &meta_ac,
 326                                     OCFS2_XATTR_VALUE_EXTENT, xv);
 327         if (ret) {
 328                 mlog_errno(ret);
 329                 return ret;
 330         }
 331
 332         mutex_lock(&tl_inode->i_mutex);
 333
 334         if (ocfs2_truncate_log_needs_flush(osb)) {
 335                 ret = __ocfs2_flush_truncate_log(osb);
 336                 if (ret < 0) {
 337                         mlog_errno(ret);
 338                         goto out;
 339                 }
 340         }
 341
 342         handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
 343         if (IS_ERR(handle)) {
 344                 ret = PTR_ERR(handle);
 345                 mlog_errno(ret);
 346                 goto out;
 347         }
 348
 349         ret = ocfs2_journal_access(handle, inode, root_bh,
 350                                    OCFS2_JOURNAL_ACCESS_WRITE);
 351         if (ret) {
 352                 mlog_errno(ret);
 353                 goto out_commit;
 354         }
 355
 356         ret = ocfs2_remove_extent(inode, root_bh, cpos, len, handle, meta_ac,
 357                                   dealloc, OCFS2_XATTR_VALUE_EXTENT, xv);
 358         if (ret) {
 359                 mlog_errno(ret);
 360                 goto out_commit;
 361         }
 362
 363         le32_add_cpu(&xv->xr_clusters, -len);
 364
 365         ret = ocfs2_journal_dirty(handle, root_bh);
 366         if (ret) {
 367                 mlog_errno(ret);
 368                 goto out_commit;
 369         }
 370
 371         ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
 372         if (ret)
 373                 mlog_errno(ret);
 374
 375 out_commit:
 376         ocfs2_commit_trans(osb, handle);
 377 out:
 378         mutex_unlock(&tl_inode->i_mutex);
 379
 380         if (meta_ac)
 381                 ocfs2_free_alloc_context(meta_ac);
 382
 383         return ret;
 384 }
 385
 386 static int ocfs2_xattr_shrink_size(struct inode *inode,
 387                                    u32 old_clusters,
 388                                    u32 new_clusters,
 389                                    struct buffer_head *root_bh,
 390                                    struct ocfs2_xattr_value_root *xv)
 391 {
 392         int ret = 0;
 393         u32 trunc_len, cpos, phys_cpos, alloc_size;
 394         u64 block;
 395         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 396         struct ocfs2_cached_dealloc_ctxt dealloc;
 397
 398         ocfs2_init_dealloc_ctxt(&dealloc);
 399
 400         if (old_clusters <= new_clusters)
 401                 return 0;
 402
 403         cpos = new_clusters;
 404         trunc_len = old_clusters - new_clusters;
 405         while (trunc_len) {
 406                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
 407                                                &alloc_size, &xv->xr_list);
 408                 if (ret) {
 409                         mlog_errno(ret);
 410                         goto out;
 411                 }
 412
 413                 if (alloc_size > trunc_len)
 414                         alloc_size = trunc_len;
 415
 416                 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
 417                                                  phys_cpos, alloc_size,
 418                                                  &dealloc);
 419                 if (ret) {
 420                         mlog_errno(ret);
 421                         goto out;
 422                 }
 423
 424                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 425                 ocfs2_remove_xattr_clusters_from_cache(inode, block,
 426                                                        alloc_size);
 427                 cpos += alloc_size;
 428                 trunc_len -= alloc_size;
 429         }
 430
 431 out:
 432         ocfs2_schedule_truncate_log_flush(osb, 1);
 433         ocfs2_run_deallocs(osb, &dealloc);
 434
 435         return ret;
 436 }
 437
 438 static int ocfs2_xattr_value_truncate(struct inode *inode,
 439                                       struct buffer_head *root_bh,
 440                                       struct ocfs2_xattr_value_root *xv,
 441                                       int len)
 442 {
 443         int ret;
 444         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
 445         u32 old_clusters = le32_to_cpu(xv->xr_clusters);
 446
 447         if (new_clusters == old_clusters)
 448                 return 0;
 449
 450         if (new_clusters > old_clusters)
 451                 ret = ocfs2_xattr_extend_allocation(inode,
 452                                                     new_clusters - old_clusters,
 453                                                     root_bh, xv);
 454         else
 455                 ret = ocfs2_xattr_shrink_size(inode,
 456                                               old_clusters, new_clusters,
 457                                               root_bh, xv);
 458
 459         return ret;
 460 }
 461
 462 static int ocfs2_xattr_list_entries(struct inode *inode,
 463                                     struct ocfs2_xattr_header *header,
 464                                     char *buffer, size_t buffer_size)
 465 {
 466         size_t rest = buffer_size;
 467         int i;
 468
 469         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
 470                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 471                 struct xattr_handler *handler =
 472                         ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
 473
 474                 if (handler) {
 475                         size_t size = handler->list(inode, buffer, rest,
 476                                         ((char *)header +
 477                                         le16_to_cpu(entry->xe_name_offset)),
 478                                         entry->xe_name_len);
 479                         if (buffer) {
 480                                 if (size > rest)
 481                                         return -ERANGE;
 482                                 buffer += size;
 483                         }
 484                         rest -= size;
 485                 }
 486         }
 487
 488         return buffer_size - rest;
 489 }
 490
 491 static int ocfs2_xattr_ibody_list(struct inode *inode,
 492                                   struct ocfs2_dinode *di,
 493                                   char *buffer,
 494                                   size_t buffer_size)
 495 {
 496         struct ocfs2_xattr_header *header = NULL;
 497         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 498         int ret = 0;
 499
 500         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 501                 return ret;
 502
 503         header = (struct ocfs2_xattr_header *)
 504                  ((void *)di + inode->i_sb->s_blocksize -
 505                  le16_to_cpu(di->i_xattr_inline_size));
 506
 507         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
 508
 509         return ret;
 510 }
 511
 512 static int ocfs2_xattr_block_list(struct inode *inode,
 513                                   struct ocfs2_dinode *di,
 514                                   char *buffer,
 515                                   size_t buffer_size)
 516 {
 517         struct buffer_head *blk_bh = NULL;
 518         struct ocfs2_xattr_block *xb;
 519         int ret = 0;
 520
 521         if (!di->i_xattr_loc)
 522                 return ret;
 523
 524         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
 525                                le64_to_cpu(di->i_xattr_loc),
 526                                &blk_bh, OCFS2_BH_CACHED, inode);
 527         if (ret < 0) {
 528                 mlog_errno(ret);
 529                 return ret;
 530         }
 531         /*Verify the signature of xattr block*/
 532         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
 533                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
 534                 ret = -EFAULT;
 535                 goto cleanup;
 536         }
 537
 538         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 539
 540         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 541                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
 542                 ret = ocfs2_xattr_list_entries(inode, header,
 543                                                buffer, buffer_size);
 544         } else {
 545                 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
 546                 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
 547                                                    buffer, buffer_size);
 548         }
 549 cleanup:
 550         brelse(blk_bh);
 551
 552         return ret;
 553 }
 554
 555 ssize_t ocfs2_listxattr(struct dentry *dentry,
 556                         char *buffer,
 557                         size_t size)
 558 {
 559         int ret = 0, i_ret = 0, b_ret = 0;
 560         struct buffer_head *di_bh = NULL;
 561         struct ocfs2_dinode *di = NULL;
 562         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
 563
 564         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 565                 return ret;
 566
 567         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
 568         if (ret < 0) {
 569                 mlog_errno(ret);
 570                 return ret;
 571         }
 572
 573         di = (struct ocfs2_dinode *)di_bh->b_data;
 574
 575         down_read(&oi->ip_xattr_sem);
 576         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
 577         if (i_ret < 0)
 578                 b_ret = 0;
 579         else {
 580                 if (buffer) {
 581                         buffer += i_ret;
 582                         size -= i_ret;
 583                 }
 584                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
 585                                                buffer, size);
 586                 if (b_ret < 0)
 587                         i_ret = 0;
 588         }
 589         up_read(&oi->ip_xattr_sem);
 590         ocfs2_inode_unlock(dentry->d_inode, 0);
 591
 592         brelse(di_bh);
 593
 594         return i_ret + b_ret;
 595 }
 596
 597 static int ocfs2_xattr_find_entry(int name_index,
 598                                   const char *name,
 599                                   struct ocfs2_xattr_search *xs)
 600 {
 601         struct ocfs2_xattr_entry *entry;
 602         size_t name_len;
 603         int i, cmp = 1;
 604
 605         if (name == NULL)
 606                 return -EINVAL;
 607
 608         name_len = strlen(name);
 609         entry = xs->here;
 610         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
 611                 cmp = name_index - ocfs2_xattr_get_type(entry);
 612                 if (!cmp)
 613                         cmp = name_len - entry->xe_name_len;
 614                 if (!cmp)
 615                         cmp = memcmp(name, (xs->base +
 616                                      le16_to_cpu(entry->xe_name_offset)),
 617                                      name_len);
 618                 if (cmp == 0)
 619                         break;
 620                 entry += 1;
 621         }
 622         xs->here = entry;
 623
 624         return cmp ? -ENODATA : 0;
 625 }
 626
 627 static int ocfs2_xattr_get_value_outside(struct inode *inode,
 628                                          struct ocfs2_xattr_value_root *xv,
 629                                          void *buffer,
 630                                          size_t len)
 631 {
 632         u32 cpos, p_cluster, num_clusters, bpc, clusters;
 633         u64 blkno;
 634         int i, ret = 0;
 635         size_t cplen, blocksize;
 636         struct buffer_head *bh = NULL;
 637         struct ocfs2_extent_list *el;
 638
 639         el = &xv->xr_list;
 640         clusters = le32_to_cpu(xv->xr_clusters);
 641         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 642         blocksize = inode->i_sb->s_blocksize;
 643
 644         cpos = 0;
 645         while (cpos < clusters) {
 646                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 647                                                &num_clusters, el);
 648                 if (ret) {
 649                         mlog_errno(ret);
 650                         goto out;
 651                 }
 652
 653                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 654                 /* Copy ocfs2_xattr_value */
 655                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
 656                         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
 657                                                &bh, OCFS2_BH_CACHED, inode);
 658                         if (ret) {
 659                                 mlog_errno(ret);
 660                                 goto out;
 661                         }
 662
 663                         cplen = len >= blocksize ? blocksize : len;
 664                         memcpy(buffer, bh->b_data, cplen);
 665                         len -= cplen;
 666                         buffer += cplen;
 667
 668                         brelse(bh);
 669                         bh = NULL;
 670                         if (len == 0)
 671                                 break;
 672                 }
 673                 cpos += num_clusters;
 674         }
 675 out:
 676         return ret;
 677 }
 678
 679 static int ocfs2_xattr_ibody_get(struct inode *inode,
 680                                  int name_index,
 681                                  const char *name,
 682                                  void *buffer,
 683                                  size_t buffer_size,
 684                                  struct ocfs2_xattr_search *xs)
 685 {
 686         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 687         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
 688         struct ocfs2_xattr_value_root *xv;
 689         size_t size;
 690         int ret = 0;
 691
 692         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 693                 return -ENODATA;
 694
 695         xs->end = (void *)di + inode->i_sb->s_blocksize;
 696         xs->header = (struct ocfs2_xattr_header *)
 697                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
 698         xs->base = (void *)xs->header;
 699         xs->here = xs->header->xh_entries;
 700
 701         ret = ocfs2_xattr_find_entry(name_index, name, xs);
 702         if (ret)
 703                 return ret;
 704         size = le64_to_cpu(xs->here->xe_value_size);
 705         if (buffer) {
 706                 if (size > buffer_size)
 707                         return -ERANGE;
 708                 if (ocfs2_xattr_is_local(xs->here)) {
 709                         memcpy(buffer, (void *)xs->base +
 710                                le16_to_cpu(xs->here->xe_name_offset) +
 711                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
 712                 } else {
 713                         xv = (struct ocfs2_xattr_value_root *)
 714                                 (xs->base + le16_to_cpu(
 715                                  xs->here->xe_name_offset) +
 716                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
 717                         ret = ocfs2_xattr_get_value_outside(inode, xv,
 718                                                             buffer, size);
 719                         if (ret < 0) {
 720                                 mlog_errno(ret);
 721                                 return ret;
 722                         }
 723                 }
 724         }
 725
 726         return size;
 727 }
 728
 729 static int ocfs2_xattr_block_get(struct inode *inode,
 730                                  int name_index,
 731                                  const char *name,
 732                                  void *buffer,
 733                                  size_t buffer_size,
 734                                  struct ocfs2_xattr_search *xs)
 735 {
 736         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
 737         struct buffer_head *blk_bh = NULL;
 738         struct ocfs2_xattr_block *xb;
 739         struct ocfs2_xattr_value_root *xv;
 740         size_t size;
 741         int ret = -ENODATA, name_offset, name_len, block_off, i;
 742
 743         if (!di->i_xattr_loc)
 744                 return ret;
 745
 746         memset(&xs->bucket, 0, sizeof(xs->bucket));
 747
 748         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
 749                                le64_to_cpu(di->i_xattr_loc),
 750                                &blk_bh, OCFS2_BH_CACHED, inode);
 751         if (ret < 0) {
 752                 mlog_errno(ret);
 753                 return ret;
 754         }
 755         /*Verify the signature of xattr block*/
 756         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
 757                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
 758                 ret = -EFAULT;
 759                 goto cleanup;
 760         }
 761
 762         xs->xattr_bh = blk_bh;
 763         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 764
 765         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 766                 xs->header = &xb->xb_attrs.xb_header;
 767                 xs->base = (void *)xs->header;
 768                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
 769                 xs->here = xs->header->xh_entries;
 770
 771                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
 772         } else
 773                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
 774                                                    name_index,
 775                                                    name, xs);
 776
 777         if (ret)
 778                 goto cleanup;
 779         size = le64_to_cpu(xs->here->xe_value_size);
 780         if (buffer) {
 781                 ret = -ERANGE;
 782                 if (size > buffer_size)
 783                         goto cleanup;
 784
 785                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
 786                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
 787                 i = xs->here - xs->header->xh_entries;
 788
 789                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
 790                         ret = ocfs2_xattr_bucket_get_name_value(inode,
 791                                                                 xs->bucket.xh,
 792                                                                 i,
 793                                                                 &block_off,
 794                                                                 &name_offset);
 795                         xs->base = xs->bucket.bhs[block_off]->b_data;
 796                 }
 797                 if (ocfs2_xattr_is_local(xs->here)) {
 798                         memcpy(buffer, (void *)xs->base +
 799                                name_offset + name_len, size);
 800                 } else {
 801                         xv = (struct ocfs2_xattr_value_root *)
 802                                 (xs->base + name_offset + name_len);
 803                         ret = ocfs2_xattr_get_value_outside(inode, xv,
 804                                                             buffer, size);
 805                         if (ret < 0) {
 806                                 mlog_errno(ret);
 807                                 goto cleanup;
 808                         }
 809                 }
 810         }
 811         ret = size;
 812 cleanup:
 813         for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
 814                 brelse(xs->bucket.bhs[i]);
 815         memset(&xs->bucket, 0, sizeof(xs->bucket));
 816
 817         brelse(blk_bh);
 818         return ret;
 819 }
 820
 821 /* ocfs2_xattr_get()
 822  *
 823  * Copy an extended attribute into the buffer provided.
 824  * Buffer is NULL to compute the size of buffer required.
 825  */
 826 int ocfs2_xattr_get(struct inode *inode,
 827                     int name_index,
 828                     const char *name,
 829                     void *buffer,
 830                     size_t buffer_size)
 831 {
 832         int ret;
 833         struct ocfs2_dinode *di = NULL;
 834         struct buffer_head *di_bh = NULL;
 835         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 836         struct ocfs2_xattr_search xis = {
 837                 .not_found = -ENODATA,
 838         };
 839         struct ocfs2_xattr_search xbs = {
 840                 .not_found = -ENODATA,
 841         };
 842
 843         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 844                 ret = -ENODATA;
 845
 846         ret = ocfs2_inode_lock(inode, &di_bh, 0);
 847         if (ret < 0) {
 848                 mlog_errno(ret);
 849                 return ret;
 850         }
 851         xis.inode_bh = xbs.inode_bh = di_bh;
 852         di = (struct ocfs2_dinode *)di_bh->b_data;
 853
 854         down_read(&oi->ip_xattr_sem);
 855         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
 856                                     buffer_size, &xis);
 857         if (ret == -ENODATA)
 858                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
 859                                             buffer_size, &xbs);
 860         up_read(&oi->ip_xattr_sem);
 861         ocfs2_inode_unlock(inode, 0);
 862
 863         brelse(di_bh);
 864
 865         return ret;
 866 }
 867
 868 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
 869                                            struct ocfs2_xattr_value_root *xv,
 870                                            const void *value,
 871                                            int value_len)
 872 {
 873         int ret = 0, i, cp_len, credits;
 874         u16 blocksize = inode->i_sb->s_blocksize;
 875         u32 p_cluster, num_clusters;
 876         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 877         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
 878         u64 blkno;
 879         struct buffer_head *bh = NULL;
 880         handle_t *handle;
 881
 882         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
 883
 884         credits = clusters * bpc;
 885         handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
 886         if (IS_ERR(handle)) {
 887                 ret = PTR_ERR(handle);
 888                 mlog_errno(ret);
 889                 goto out;
 890         }
 891
 892         while (cpos < clusters) {
 893                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 894                                                &num_clusters, &xv->xr_list);
 895                 if (ret) {
 896                         mlog_errno(ret);
 897                         goto out_commit;
 898                 }
 899
 900                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 901
 902                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
 903                         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
 904                                                &bh, OCFS2_BH_CACHED, inode);
 905                         if (ret) {
 906                                 mlog_errno(ret);
 907                                 goto out_commit;
 908                         }
 909
 910                         ret = ocfs2_journal_access(handle,
 911                                                    inode,
 912                                                    bh,
 913                                                    OCFS2_JOURNAL_ACCESS_WRITE);
 914                         if (ret < 0) {
 915                                 mlog_errno(ret);
 916                                 goto out_commit;
 917                         }
 918
 919                         cp_len = value_len > blocksize ? blocksize : value_len;
 920                         memcpy(bh->b_data, value, cp_len);
 921                         value_len -= cp_len;
 922                         value += cp_len;
 923                         if (cp_len < blocksize)
 924                                 memset(bh->b_data + cp_len, 0,
 925                                        blocksize - cp_len);
 926
 927                         ret = ocfs2_journal_dirty(handle, bh);
 928                         if (ret < 0) {
 929                                 mlog_errno(ret);
 930                                 goto out_commit;
 931                         }
 932                         brelse(bh);
 933                         bh = NULL;
 934
 935                         /*
 936                          * XXX: do we need to empty all the following
 937                          * blocks in this cluster?
 938                          */
 939                         if (!value_len)
 940                                 break;
 941                 }
 942                 cpos += num_clusters;
 943         }
 944 out_commit:
 945         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 946 out:
 947         brelse(bh);
 948
 949         return ret;
 950 }
 951
 952 static int ocfs2_xattr_cleanup(struct inode *inode,
 953                                struct ocfs2_xattr_info *xi,
 954                                struct ocfs2_xattr_search *xs,
 955                                size_t offs)
 956 {
 957         handle_t *handle = NULL;
 958         int ret = 0;
 959         size_t name_len = strlen(xi->name);
 960         void *val = xs->base + offs;
 961         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 962
 963         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
 964                                    OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
 965         if (IS_ERR(handle)) {
 966                 ret = PTR_ERR(handle);
 967                 mlog_errno(ret);
 968                 goto out;
 969         }
 970         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
 971                                    OCFS2_JOURNAL_ACCESS_WRITE);
 972         if (ret) {
 973                 mlog_errno(ret);
 974                 goto out_commit;
 975         }
 976         /* Decrease xattr count */
 977         le16_add_cpu(&xs->header->xh_count, -1);
 978         /* Remove the xattr entry and tree root which has already be set*/
 979         memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
 980         memset(val, 0, size);
 981
 982         ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
 983         if (ret < 0)
 984                 mlog_errno(ret);
 985 out_commit:
 986         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
 987 out:
 988         return ret;
 989 }
 990
 991 static int ocfs2_xattr_update_entry(struct inode *inode,
 992                                     struct ocfs2_xattr_info *xi,
 993                                     struct ocfs2_xattr_search *xs,
 994                                     size_t offs)
 995 {
 996         handle_t *handle = NULL;
 997         int ret = 0;
 998
 999         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1000                                    OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1001         if (IS_ERR(handle)) {
1002                 ret = PTR_ERR(handle);
1003                 mlog_errno(ret);
1004                 goto out;
1005         }
1006         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1007                                    OCFS2_JOURNAL_ACCESS_WRITE);
1008         if (ret) {
1009                 mlog_errno(ret);
1010                 goto out_commit;
1011         }
1012
1013         xs->here->xe_name_offset = cpu_to_le16(offs);
1014         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1015         if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1016                 ocfs2_xattr_set_local(xs->here, 1);
1017         else
1018                 ocfs2_xattr_set_local(xs->here, 0);
1019         ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1020
1021         ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1022         if (ret < 0)
1023                 mlog_errno(ret);
1024 out_commit:
1025         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1026 out:
1027         return ret;
1028 }
1029
1030 /*
1031  * ocfs2_xattr_set_value_outside()
1032  *
1033  * Set large size value in B tree.
1034  */
1035 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1036                                          struct ocfs2_xattr_info *xi,
1037                                          struct ocfs2_xattr_search *xs,
1038                                          size_t offs)
1039 {
1040         size_t name_len = strlen(xi->name);
1041         void *val = xs->base + offs;
1042         struct ocfs2_xattr_value_root *xv = NULL;
1043         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1044         int ret = 0;
1045
1046         memset(val, 0, size);
1047         memcpy(val, xi->name, name_len);
1048         xv = (struct ocfs2_xattr_value_root *)
1049                 (val + OCFS2_XATTR_SIZE(name_len));
1050         xv->xr_clusters = 0;
1051         xv->xr_last_eb_blk = 0;
1052         xv->xr_list.l_tree_depth = 0;
1053         xv->xr_list.l_count = cpu_to_le16(1);
1054         xv->xr_list.l_next_free_rec = 0;
1055
1056         ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
1057                                          xi->value_len);
1058         if (ret < 0) {
1059                 mlog_errno(ret);
1060                 return ret;
1061         }
1062         ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
1063                                               xi->value_len);
1064         if (ret < 0) {
1065                 mlog_errno(ret);
1066                 return ret;
1067         }
1068         ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
1069         if (ret < 0)
1070                 mlog_errno(ret);
1071
1072         return ret;
1073 }
1074
1075 /*
1076  * ocfs2_xattr_set_entry_local()
1077  *
1078  * Set, replace or remove extended attribute in local.
1079  */
1080 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1081                                         struct ocfs2_xattr_info *xi,
1082                                         struct ocfs2_xattr_search *xs,
1083                                         struct ocfs2_xattr_entry *last,
1084                                         size_t min_offs)
1085 {
1086         size_t name_len = strlen(xi->name);
1087         int i;
1088
1089         if (xi->value && xs->not_found) {
1090                 /* Insert the new xattr entry. */
1091                 le16_add_cpu(&xs->header->xh_count, 1);
1092                 ocfs2_xattr_set_type(last, xi->name_index);
1093                 ocfs2_xattr_set_local(last, 1);
1094                 last->xe_name_len = name_len;
1095         } else {
1096                 void *first_val;
1097                 void *val;
1098                 size_t offs, size;
1099
1100                 first_val = xs->base + min_offs;
1101                 offs = le16_to_cpu(xs->here->xe_name_offset);
1102                 val = xs->base + offs;
1103
1104                 if (le64_to_cpu(xs->here->xe_value_size) >
1105                     OCFS2_XATTR_INLINE_SIZE)
1106                         size = OCFS2_XATTR_SIZE(name_len) +
1107                                 OCFS2_XATTR_ROOT_SIZE;
1108                 else
1109                         size = OCFS2_XATTR_SIZE(name_len) +
1110                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1111
1112                 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1113                                 OCFS2_XATTR_SIZE(xi->value_len)) {
1114                         /* The old and the new value have the
1115                            same size. Just replace the value. */
1116                         ocfs2_xattr_set_local(xs->here, 1);
1117                         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1118                         /* Clear value bytes. */
1119                         memset(val + OCFS2_XATTR_SIZE(name_len),
1120                                0,
1121                                OCFS2_XATTR_SIZE(xi->value_len));
1122                         memcpy(val + OCFS2_XATTR_SIZE(name_len),
1123                                xi->value,
1124                                xi->value_len);
1125                         return;
1126                 }
1127                 /* Remove the old name+value. */
1128                 memmove(first_val + size, first_val, val - first_val);
1129                 memset(first_val, 0, size);
1130                 xs->here->xe_name_hash = 0;
1131                 xs->here->xe_name_offset = 0;
1132                 ocfs2_xattr_set_local(xs->here, 1);
1133                 xs->here->xe_value_size = 0;
1134
1135                 min_offs += size;
1136
1137                 /* Adjust all value offsets. */
1138                 last = xs->header->xh_entries;
1139                 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1140                         size_t o = le16_to_cpu(last->xe_name_offset);
1141
1142                         if (o < offs)
1143                                 last->xe_name_offset = cpu_to_le16(o + size);
1144                         last += 1;
1145                 }
1146
1147                 if (!xi->value) {
1148                         /* Remove the old entry. */
1149                         last -= 1;
1150                         memmove(xs->here, xs->here + 1,
1151                                 (void *)last - (void *)xs->here);
1152                         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1153                         le16_add_cpu(&xs->header->xh_count, -1);
1154                 }
1155         }
1156         if (xi->value) {
1157                 /* Insert the new name+value. */
1158                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1159                                 OCFS2_XATTR_SIZE(xi->value_len);
1160                 void *val = xs->base + min_offs - size;
1161
1162                 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1163                 memset(val, 0, size);
1164                 memcpy(val, xi->name, name_len);
1165                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1166                        xi->value,
1167                        xi->value_len);
1168                 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1169                 ocfs2_xattr_set_local(xs->here, 1);
1170                 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1171         }
1172
1173         return;
1174 }
1175
1176 /*
1177  * ocfs2_xattr_set_entry()
1178  *
1179  * Set extended attribute entry into inode or block.
1180  *
1181  * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1182  * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1183  * then set value in B tree with set_value_outside().
1184  */
1185 static int ocfs2_xattr_set_entry(struct inode *inode,
1186                                  struct ocfs2_xattr_info *xi,
1187                                  struct ocfs2_xattr_search *xs,
1188                                  int flag)
1189 {
1190         struct ocfs2_xattr_entry *last;
1191         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1192         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1193         size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1194         size_t size_l = 0;
1195         handle_t *handle = NULL;
1196         int free, i, ret;
1197         struct ocfs2_xattr_info xi_l = {
1198                 .name_index = xi->name_index,
1199                 .name = xi->name,
1200                 .value = xi->value,
1201                 .value_len = xi->value_len,
1202         };
1203
1204         /* Compute min_offs, last and free space. */
1205         last = xs->header->xh_entries;
1206
1207         for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1208                 size_t offs = le16_to_cpu(last->xe_name_offset);
1209                 if (offs < min_offs)
1210                         min_offs = offs;
1211                 last += 1;
1212         }
1213
1214         free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
1215         if (free < 0)
1216                 return -EFAULT;
1217
1218         if (!xs->not_found) {
1219                 size_t size = 0;
1220                 if (ocfs2_xattr_is_local(xs->here))
1221                         size = OCFS2_XATTR_SIZE(name_len) +
1222                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1223                 else
1224                         size = OCFS2_XATTR_SIZE(name_len) +
1225                                 OCFS2_XATTR_ROOT_SIZE;
1226                 free += (size + sizeof(struct ocfs2_xattr_entry));
1227         }
1228         /* Check free space in inode or block */
1229         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1230                 if (free < sizeof(struct ocfs2_xattr_entry) +
1231                            OCFS2_XATTR_SIZE(name_len) +
1232                            OCFS2_XATTR_ROOT_SIZE) {
1233                         ret = -ENOSPC;
1234                         goto out;
1235                 }
1236                 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1237                 xi_l.value = (void *)&def_xv;
1238                 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1239         } else if (xi->value) {
1240                 if (free < sizeof(struct ocfs2_xattr_entry) +
1241                            OCFS2_XATTR_SIZE(name_len) +
1242                            OCFS2_XATTR_SIZE(xi->value_len)) {
1243                         ret = -ENOSPC;
1244                         goto out;
1245                 }
1246         }
1247
1248         if (!xs->not_found) {
1249                 /* For existing extended attribute */
1250                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1251                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1252                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1253                 void *val = xs->base + offs;
1254
1255                 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1256                         /* Replace existing local xattr with tree root */
1257                         ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1258                                                             offs);
1259                         if (ret < 0)
1260                                 mlog_errno(ret);
1261                         goto out;
1262                 } else if (!ocfs2_xattr_is_local(xs->here)) {
1263                         /* For existing xattr which has value outside */
1264                         struct ocfs2_xattr_value_root *xv = NULL;
1265                         xv = (struct ocfs2_xattr_value_root *)(val +
1266                                 OCFS2_XATTR_SIZE(name_len));
1267
1268                         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1269                                 /*
1270                                  * If new value need set outside also,
1271                                  * first truncate old value to new value,
1272                                  * then set new value with set_value_outside().
1273                                  */
1274                                 ret = ocfs2_xattr_value_truncate(inode,
1275                                                                  xs->xattr_bh,
1276                                                                  xv,
1277                                                                  xi->value_len);
1278                                 if (ret < 0) {
1279                                         mlog_errno(ret);
1280                                         goto out;
1281                                 }
1282
1283                                 ret = __ocfs2_xattr_set_value_outside(inode,
1284                                                                 xv,
1285                                                                 xi->value,
1286                                                                 xi->value_len);
1287                                 if (ret < 0) {
1288                                         mlog_errno(ret);
1289                                         goto out;
1290                                 }
1291
1292                                 ret = ocfs2_xattr_update_entry(inode,
1293                                                                xi,
1294                                                                xs,
1295                                                                offs);
1296                                 if (ret < 0)
1297                                         mlog_errno(ret);
1298                                 goto out;
1299                         } else {
1300                                 /*
1301                                  * If new value need set in local,
1302                                  * just trucate old value to zero.
1303                                  */
1304                                  ret = ocfs2_xattr_value_truncate(inode,
1305                                                                  xs->xattr_bh,
1306                                                                  xv,
1307                                                                  0);
1308                                 if (ret < 0)
1309                                         mlog_errno(ret);
1310                         }
1311                 }
1312         }
1313
1314         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1315                                    OCFS2_INODE_UPDATE_CREDITS);
1316         if (IS_ERR(handle)) {
1317                 ret = PTR_ERR(handle);
1318                 mlog_errno(ret);
1319                 goto out;
1320         }
1321
1322         ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1323                                    OCFS2_JOURNAL_ACCESS_WRITE);
1324         if (ret) {
1325                 mlog_errno(ret);
1326                 goto out_commit;
1327         }
1328
1329         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1330                 /*set extended attribue in external blcok*/
1331                 ret = ocfs2_extend_trans(handle,
1332                                          OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1333                 if (ret) {
1334                         mlog_errno(ret);
1335                         goto out_commit;
1336                 }
1337                 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1338                                            OCFS2_JOURNAL_ACCESS_WRITE);
1339                 if (ret) {
1340                         mlog_errno(ret);
1341                         goto out_commit;
1342                 }
1343         }
1344
1345         /*
1346          * Set value in local, include set tree root in local.
1347          * This is the first step for value size >INLINE_SIZE.
1348          */
1349         ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1350
1351         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1352                 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1353                 if (ret < 0) {
1354                         mlog_errno(ret);
1355                         goto out_commit;
1356                 }
1357         }
1358
1359         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1360             (flag & OCFS2_INLINE_XATTR_FL)) {
1361                 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1362                 unsigned int xattrsize = osb->s_xattr_inline_size;
1363
1364                 /*
1365                  * Adjust extent record count or inline data size
1366                  * to reserve space for extended attribute.
1367                  */
1368                 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1369                         struct ocfs2_inline_data *idata = &di->id2.i_data;
1370                         le16_add_cpu(&idata->id_count, -xattrsize);
1371                 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1372                         struct ocfs2_extent_list *el = &di->id2.i_list;
1373                         le16_add_cpu(&el->l_count, -(xattrsize /
1374                                         sizeof(struct ocfs2_extent_rec)));
1375                 }
1376                 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1377         }
1378         /* Update xattr flag */
1379         spin_lock(&oi->ip_lock);
1380         oi->ip_dyn_features |= flag;
1381         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1382         spin_unlock(&oi->ip_lock);
1383         /* Update inode ctime */
1384         inode->i_ctime = CURRENT_TIME;
1385         di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1386         di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1387
1388         ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1389         if (ret < 0)
1390                 mlog_errno(ret);
1391
1392 out_commit:
1393         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1394
1395         if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1396                 /*
1397                  * Set value outside in B tree.
1398                  * This is the second step for value size > INLINE_SIZE.
1399                  */
1400                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1401                 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
1402                 if (ret < 0) {
1403                         int ret2;
1404
1405                         mlog_errno(ret);
1406                         /*
1407                          * If set value outside failed, we have to clean
1408                          * the junk tree root we have already set in local.
1409                          */
1410                         ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
1411                         if (ret2 < 0)
1412                                 mlog_errno(ret2);
1413                 }
1414         }
1415 out:
1416         return ret;
1417
1418 }
1419
1420 static int ocfs2_xattr_free_block(handle_t *handle,
1421                                   struct ocfs2_super *osb,
1422                                   struct ocfs2_xattr_block *xb)
1423 {
1424         struct inode *xb_alloc_inode;
1425         struct buffer_head *xb_alloc_bh = NULL;
1426         u64 blk = le64_to_cpu(xb->xb_blkno);
1427         u16 bit = le16_to_cpu(xb->xb_suballoc_bit);
1428         u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1429         int ret = 0;
1430
1431         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1432                                 EXTENT_ALLOC_SYSTEM_INODE,
1433                                 le16_to_cpu(xb->xb_suballoc_slot));
1434         if (!xb_alloc_inode) {
1435                 ret = -ENOMEM;
1436                 mlog_errno(ret);
1437                 goto out;
1438         }
1439         mutex_lock(&xb_alloc_inode->i_mutex);
1440
1441         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1442         if (ret < 0) {
1443                 mlog_errno(ret);
1444                 goto out_mutex;
1445         }
1446         ret = ocfs2_extend_trans(handle, OCFS2_SUBALLOC_FREE);
1447         if (ret < 0) {
1448                 mlog_errno(ret);
1449                 goto out_unlock;
1450         }
1451         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1452                                        bit, bg_blkno, 1);
1453         if (ret < 0)
1454                 mlog_errno(ret);
1455 out_unlock:
1456         ocfs2_inode_unlock(xb_alloc_inode, 1);
1457         brelse(xb_alloc_bh);
1458 out_mutex:
1459         mutex_unlock(&xb_alloc_inode->i_mutex);
1460         iput(xb_alloc_inode);
1461 out:
1462         return ret;
1463 }
1464
1465 static int ocfs2_remove_value_outside(struct inode*inode,
1466                                       struct buffer_head *bh,
1467                                       struct ocfs2_xattr_header *header)
1468 {
1469         int ret = 0, i;
1470
1471         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1472                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1473
1474                 if (!ocfs2_xattr_is_local(entry)) {
1475                         struct ocfs2_xattr_value_root *xv;
1476                         void *val;
1477
1478                         val = (void *)header +
1479                                 le16_to_cpu(entry->xe_name_offset);
1480                         xv = (struct ocfs2_xattr_value_root *)
1481                                 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1482                         ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
1483                         if (ret < 0) {
1484                                 mlog_errno(ret);
1485                                 return ret;
1486                         }
1487                 }
1488         }
1489
1490         return ret;
1491 }
1492
1493 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1494                                     struct buffer_head *di_bh)
1495 {
1496
1497         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1498         struct ocfs2_xattr_header *header;
1499         int ret;
1500
1501         header = (struct ocfs2_xattr_header *)
1502                  ((void *)di + inode->i_sb->s_blocksize -
1503                  le16_to_cpu(di->i_xattr_inline_size));
1504
1505         ret = ocfs2_remove_value_outside(inode, di_bh, header);
1506
1507         return ret;
1508 }
1509
1510 static int ocfs2_xattr_block_remove(struct inode *inode,
1511                                     struct buffer_head *blk_bh)
1512 {
1513         struct ocfs2_xattr_block *xb;
1514         struct ocfs2_xattr_header *header;
1515         int ret = 0;
1516
1517         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1518         header = &(xb->xb_attrs.xb_header);
1519
1520         ret = ocfs2_remove_value_outside(inode, blk_bh, header);
1521
1522         return ret;
1523 }
1524
1525 /*
1526  * ocfs2_xattr_remove()
1527  *
1528  * Free extended attribute resources associated with this inode.
1529  */
1530 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1531 {
1532         struct ocfs2_xattr_block *xb;
1533         struct buffer_head *blk_bh = NULL;
1534         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1535         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1536         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1537         handle_t *handle;
1538         int ret;
1539
1540         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1541                 return 0;
1542
1543         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1544                 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1545                 if (ret < 0) {
1546                         mlog_errno(ret);
1547                         goto out;
1548                 }
1549         }
1550         if (di->i_xattr_loc) {
1551                 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1552                                        le64_to_cpu(di->i_xattr_loc),
1553                                        &blk_bh, OCFS2_BH_CACHED, inode);
1554                 if (ret < 0) {
1555                         mlog_errno(ret);
1556                         return ret;
1557                 }
1558                 /*Verify the signature of xattr block*/
1559                 if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1560                            strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1561                         ret = -EFAULT;
1562                         goto out;
1563                 }
1564
1565                 ret = ocfs2_xattr_block_remove(inode, blk_bh);
1566                 if (ret < 0) {
1567                         mlog_errno(ret);
1568                         goto out;
1569                 }
1570         }
1571
1572         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1573                                    OCFS2_INODE_UPDATE_CREDITS);
1574         if (IS_ERR(handle)) {
1575                 ret = PTR_ERR(handle);
1576                 mlog_errno(ret);
1577                 goto out;
1578         }
1579         ret = ocfs2_journal_access(handle, inode, di_bh,
1580                                    OCFS2_JOURNAL_ACCESS_WRITE);
1581         if (ret) {
1582                 mlog_errno(ret);
1583                 goto out_commit;
1584         }
1585
1586         if (di->i_xattr_loc) {
1587                 xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1588                 ocfs2_xattr_free_block(handle, osb, xb);
1589                 di->i_xattr_loc = cpu_to_le64(0);
1590         }
1591
1592         spin_lock(&oi->ip_lock);
1593         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1594         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1595         spin_unlock(&oi->ip_lock);
1596
1597         ret = ocfs2_journal_dirty(handle, di_bh);
1598         if (ret < 0)
1599                 mlog_errno(ret);
1600 out_commit:
1601         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1602 out:
1603         brelse(blk_bh);
1604
1605         return ret;
1606 }
1607
1608 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1609                                         struct ocfs2_dinode *di)
1610 {
1611         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1612         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1613         int free;
1614
1615         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1616                 return 0;
1617
1618         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1619                 struct ocfs2_inline_data *idata = &di->id2.i_data;
1620                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1621         } else if (ocfs2_inode_is_fast_symlink(inode)) {
1622                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1623                         le64_to_cpu(di->i_size);
1624         } else {
1625                 struct ocfs2_extent_list *el = &di->id2.i_list;
1626                 free = (le16_to_cpu(el->l_count) -
1627                         le16_to_cpu(el->l_next_free_rec)) *
1628                         sizeof(struct ocfs2_extent_rec);
1629         }
1630         if (free >= xattrsize)
1631                 return 1;
1632
1633         return 0;
1634 }
1635
1636 /*
1637  * ocfs2_xattr_ibody_find()
1638  *
1639  * Find extended attribute in inode block and
1640  * fill search info into struct ocfs2_xattr_search.
1641  */
1642 static int ocfs2_xattr_ibody_find(struct inode *inode,
1643                                   int name_index,
1644                                   const char *name,
1645                                   struct ocfs2_xattr_search *xs)
1646 {
1647         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1648         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1649         int ret;
1650         int has_space = 0;
1651
1652         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1653                 return 0;
1654
1655         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1656                 down_read(&oi->ip_alloc_sem);
1657                 has_space = ocfs2_xattr_has_space_inline(inode, di);
1658                 up_read(&oi->ip_alloc_sem);
1659                 if (!has_space)
1660                         return 0;
1661         }
1662
1663         xs->xattr_bh = xs->inode_bh;
1664         xs->end = (void *)di + inode->i_sb->s_blocksize;
1665         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1666                 xs->header = (struct ocfs2_xattr_header *)
1667                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1668         else
1669                 xs->header = (struct ocfs2_xattr_header *)
1670                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1671         xs->base = (void *)xs->header;
1672         xs->here = xs->header->xh_entries;
1673
1674         /* Find the named attribute. */
1675         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1676                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1677                 if (ret && ret != -ENODATA)
1678                         return ret;
1679                 xs->not_found = ret;
1680         }
1681
1682         return 0;
1683 }
1684
1685 /*
1686  * ocfs2_xattr_ibody_set()
1687  *
1688  * Set, replace or remove an extended attribute into inode block.
1689  *
1690  */
1691 static int ocfs2_xattr_ibody_set(struct inode *inode,
1692                                  struct ocfs2_xattr_info *xi,
1693                                  struct ocfs2_xattr_search *xs)
1694 {
1695         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1696         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1697         int ret;
1698
1699         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1700                 return -ENOSPC;
1701
1702         down_write(&oi->ip_alloc_sem);
1703         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1704                 if (!ocfs2_xattr_has_space_inline(inode, di)) {
1705                         ret = -ENOSPC;
1706                         goto out;
1707                 }
1708         }
1709
1710         ret = ocfs2_xattr_set_entry(inode, xi, xs,
1711                                 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
1712 out:
1713         up_write(&oi->ip_alloc_sem);
1714
1715         return ret;
1716 }
1717
1718 /*
1719  * ocfs2_xattr_block_find()
1720  *
1721  * Find extended attribute in external block and
1722  * fill search info into struct ocfs2_xattr_search.
1723  */
1724 static int ocfs2_xattr_block_find(struct inode *inode,
1725                                   int name_index,
1726                                   const char *name,
1727                                   struct ocfs2_xattr_search *xs)
1728 {
1729         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1730         struct buffer_head *blk_bh = NULL;
1731         struct ocfs2_xattr_block *xb;
1732         int ret = 0;
1733
1734         if (!di->i_xattr_loc)
1735                 return ret;
1736
1737         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1738                                le64_to_cpu(di->i_xattr_loc),
1739                                &blk_bh, OCFS2_BH_CACHED, inode);
1740         if (ret < 0) {
1741                 mlog_errno(ret);
1742                 return ret;
1743         }
1744         /*Verify the signature of xattr block*/
1745         if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
1746                    strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
1747                         ret = -EFAULT;
1748                         goto cleanup;
1749         }
1750
1751         xs->xattr_bh = blk_bh;
1752         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1753
1754         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1755                 xs->header = &xb->xb_attrs.xb_header;
1756                 xs->base = (void *)xs->header;
1757                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
1758                 xs->here = xs->header->xh_entries;
1759
1760                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1761         } else
1762                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
1763                                                    name_index,
1764                                                    name, xs);
1765
1766         if (ret && ret != -ENODATA) {
1767                 xs->xattr_bh = NULL;
1768                 goto cleanup;
1769         }
1770         xs->not_found = ret;
1771         return 0;
1772 cleanup:
1773         brelse(blk_bh);
1774
1775         return ret;
1776 }
1777
1778 /*
1779  * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
1780  * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
1781  * re-initialized.
1782  */
1783 static int ocfs2_restore_xattr_block(struct inode *inode,
1784                                      struct ocfs2_xattr_search *xs)
1785 {
1786         int ret;
1787         handle_t *handle;
1788         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1789         struct ocfs2_xattr_block *xb =
1790                 (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1791         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
1792         u16 xb_flags = le16_to_cpu(xb->xb_flags);
1793
1794         BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
1795                 le16_to_cpu(el->l_next_free_rec) != 0);
1796
1797         handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
1798         if (IS_ERR(handle)) {
1799                 ret = PTR_ERR(handle);
1800                 handle = NULL;
1801                 goto out;
1802         }
1803
1804         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1805                                    OCFS2_JOURNAL_ACCESS_WRITE);
1806         if (ret < 0) {
1807                 mlog_errno(ret);
1808                 goto out_commit;
1809         }
1810
1811         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
1812                offsetof(struct ocfs2_xattr_block, xb_attrs));
1813
1814         xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);
1815
1816         ocfs2_journal_dirty(handle, xs->xattr_bh);
1817
1818 out_commit:
1819         ocfs2_commit_trans(osb, handle);
1820 out:
1821         return ret;
1822 }
1823
1824 /*
1825  * ocfs2_xattr_block_set()
1826  *
1827  * Set, replace or remove an extended attribute into external block.
1828  *
1829  */
1830 static int ocfs2_xattr_block_set(struct inode *inode,
1831                                  struct ocfs2_xattr_info *xi,
1832                                  struct ocfs2_xattr_search *xs)
1833 {
1834         struct buffer_head *new_bh = NULL;
1835         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1836         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)xs->inode_bh->b_data;
1837         struct ocfs2_alloc_context *meta_ac = NULL;
1838         handle_t *handle = NULL;
1839         struct ocfs2_xattr_block *xblk = NULL;
1840         u16 suballoc_bit_start;
1841         u32 num_got;
1842         u64 first_blkno;
1843         int ret;
1844
1845         if (!xs->xattr_bh) {
1846                 /*
1847                  * Alloc one external block for extended attribute
1848                  * outside of inode.
1849                  */
1850                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
1851                 if (ret < 0) {
1852                         mlog_errno(ret);
1853                         goto out;
1854                 }
1855                 handle = ocfs2_start_trans(osb,
1856                                            OCFS2_XATTR_BLOCK_CREATE_CREDITS);
1857                 if (IS_ERR(handle)) {
1858                         ret = PTR_ERR(handle);
1859                         mlog_errno(ret);
1860                         goto out;
1861                 }
1862                 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1863                                            OCFS2_JOURNAL_ACCESS_CREATE);
1864                 if (ret < 0) {
1865                         mlog_errno(ret);
1866                         goto out_commit;
1867                 }
1868
1869                 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
1870                                            &suballoc_bit_start, &num_got,
1871                                            &first_blkno);
1872                 if (ret < 0) {
1873                         mlog_errno(ret);
1874                         goto out_commit;
1875                 }
1876
1877                 new_bh = sb_getblk(inode->i_sb, first_blkno);
1878                 ocfs2_set_new_buffer_uptodate(inode, new_bh);
1879
1880                 ret = ocfs2_journal_access(handle, inode, new_bh,
1881                                            OCFS2_JOURNAL_ACCESS_CREATE);
1882                 if (ret < 0) {
1883                         mlog_errno(ret);
1884                         goto out_commit;
1885                 }
1886
1887                 /* Initialize ocfs2_xattr_block */
1888                 xs->xattr_bh = new_bh;
1889                 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
1890                 memset(xblk, 0, inode->i_sb->s_blocksize);
1891                 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
1892                 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
1893                 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1894                 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
1895                 xblk->xb_blkno = cpu_to_le64(first_blkno);
1896
1897                 xs->header = &xblk->xb_attrs.xb_header;
1898                 xs->base = (void *)xs->header;
1899                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
1900                 xs->here = xs->header->xh_entries;
1901
1902
1903                 ret = ocfs2_journal_dirty(handle, new_bh);
1904                 if (ret < 0) {
1905                         mlog_errno(ret);
1906                         goto out_commit;
1907                 }
1908                 di->i_xattr_loc = cpu_to_le64(first_blkno);
1909                 ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1910                 if (ret < 0)
1911                         mlog_errno(ret);
1912 out_commit:
1913                 ocfs2_commit_trans(osb, handle);
1914 out:
1915                 if (meta_ac)
1916                         ocfs2_free_alloc_context(meta_ac);
1917                 if (ret < 0)
1918                         return ret;
1919         } else
1920                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1921
1922         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
1923                 /* Set extended attribute into external block */
1924                 ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
1925                 if (!ret || ret != -ENOSPC)
1926                         goto end;
1927
1928                 ret = ocfs2_xattr_create_index_block(inode, xs);
1929                 if (ret)
1930                         goto end;
1931         }
1932
1933         ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
1934         if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
1935                 ret = ocfs2_restore_xattr_block(inode, xs);
1936
1937 end:
1938
1939         return ret;
1940 }
1941
1942 /*
1943  * ocfs2_xattr_set()
1944  *
1945  * Set, replace or remove an extended attribute for this inode.
1946  * value is NULL to remove an existing extended attribute, else either
1947  * create or replace an extended attribute.
1948  */
1949 int ocfs2_xattr_set(struct inode *inode,
1950                     int name_index,
1951                     const char *name,
1952                     const void *value,
1953                     size_t value_len,
1954                     int flags)
1955 {
1956         struct buffer_head *di_bh = NULL;
1957         struct ocfs2_dinode *di;
1958         int ret;
1959         u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
1960
1961         struct ocfs2_xattr_info xi = {
1962                 .name_index = name_index,
1963                 .name = name,
1964                 .value = value,
1965                 .value_len = value_len,
1966         };
1967
1968         struct ocfs2_xattr_search xis = {
1969                 .not_found = -ENODATA,
1970         };
1971
1972         struct ocfs2_xattr_search xbs = {
1973                 .not_found = -ENODATA,
1974         };
1975
1976         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1977         if (ret < 0) {
1978                 mlog_errno(ret);
1979                 return ret;
1980         }
1981         xis.inode_bh = xbs.inode_bh = di_bh;
1982         di = (struct ocfs2_dinode *)di_bh->b_data;
1983
1984         down_write(&OCFS2_I(inode)->ip_xattr_sem);
1985         /*
1986          * Scan inode and external block to find the same name
1987          * extended attribute and collect search infomation.
1988          */
1989         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
1990         if (ret)
1991                 goto cleanup;
1992         if (xis.not_found) {
1993                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
1994                 if (ret)
1995                         goto cleanup;
1996         }
1997
1998         if (xis.not_found && xbs.not_found) {
1999                 ret = -ENODATA;
2000                 if (flags & XATTR_REPLACE)
2001                         goto cleanup;
2002                 ret = 0;
2003                 if (!value)
2004                         goto cleanup;
2005         } else {
2006                 ret = -EEXIST;
2007                 if (flags & XATTR_CREATE)
2008                         goto cleanup;
2009         }
2010
2011         if (!value) {
2012                 /* Remove existing extended attribute */
2013                 if (!xis.not_found)
2014                         ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2015                 else if (!xbs.not_found)
2016                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2017         } else {
2018                 /* We always try to set extended attribute into inode first*/
2019                 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2020                 if (!ret && !xbs.not_found) {
2021                         /*
2022                          * If succeed and that extended attribute existing in
2023                          * external block, then we will remove it.
2024                          */
2025                         xi.value = NULL;
2026                         xi.value_len = 0;
2027                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2028                 } else if (ret == -ENOSPC) {
2029                         if (di->i_xattr_loc && !xbs.xattr_bh) {
2030                                 ret = ocfs2_xattr_block_find(inode, name_index,
2031                                                              name, &xbs);
2032                                 if (ret)
2033                                         goto cleanup;
2034                         }
2035                         /*
2036                          * If no space in inode, we will set extended attribute
2037                          * into external block.
2038                          */
2039                         ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
2040                         if (ret)
2041                                 goto cleanup;
2042                         if (!xis.not_found) {
2043                                 /*
2044                                  * If succeed and that extended attribute
2045                                  * existing in inode, we will remove it.
2046                                  */
2047                                 xi.value = NULL;
2048                                 xi.value_len = 0;
2049                                 ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
2050                         }
2051                 }
2052         }
2053 cleanup:
2054         up_write(&OCFS2_I(inode)->ip_xattr_sem);
2055         ocfs2_inode_unlock(inode, 1);
2056         brelse(di_bh);
2057         brelse(xbs.xattr_bh);
2058         for (i = 0; i < blk_per_bucket; i++)
2059                 brelse(xbs.bucket.bhs[i]);
2060
2061         return ret;
2062 }
2063
2064 static inline u32 ocfs2_xattr_hash_by_name(struct inode *inode,
2065                                            int name_index,
2066                                            const char *suffix_name)
2067 {
2068         struct xattr_handler *handler = ocfs2_xattr_handler(name_index);
2069         char *prefix = handler->prefix;
2070         int prefix_len = strlen(handler->prefix);
2071
2072         return ocfs2_xattr_name_hash(inode, prefix, prefix_len,
2073                                      (char *)suffix_name, strlen(suffix_name));
2074 }
2075
2076 /*
2077  * Find the xattr extent rec which may contains name_hash.
2078  * e_cpos will be the first name hash of the xattr rec.
2079  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2080  */
2081 static int ocfs2_xattr_get_rec(struct inode *inode,
2082                                u32 name_hash,
2083                                u64 *p_blkno,
2084                                u32 *e_cpos,
2085                                u32 *num_clusters,
2086                                struct ocfs2_extent_list *el)
2087 {
2088         int ret = 0, i;
2089         struct buffer_head *eb_bh = NULL;
2090         struct ocfs2_extent_block *eb;
2091         struct ocfs2_extent_rec *rec = NULL;
2092         u64 e_blkno = 0;
2093
2094         if (el->l_tree_depth) {
2095                 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2096                 if (ret) {
2097                         mlog_errno(ret);
2098                         goto out;
2099                 }
2100
2101                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2102                 el = &eb->h_list;
2103
2104                 if (el->l_tree_depth) {
2105                         ocfs2_error(inode->i_sb,
2106                                     "Inode %lu has non zero tree depth in "
2107                                     "xattr tree block %llu\n", inode->i_ino,
2108                                     (unsigned long long)eb_bh->b_blocknr);
2109                         ret = -EROFS;
2110                         goto out;
2111                 }
2112         }
2113
2114         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2115                 rec = &el->l_recs[i];
2116
2117                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2118                         e_blkno = le64_to_cpu(rec->e_blkno);
2119                         break;
2120                 }
2121         }
2122
2123         if (!e_blkno) {
2124                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2125                             "record (%u, %u, 0) in xattr", inode->i_ino,
2126                             le32_to_cpu(rec->e_cpos),
2127                             ocfs2_rec_clusters(el, rec));
2128                 ret = -EROFS;
2129                 goto out;
2130         }
2131
2132         *p_blkno = le64_to_cpu(rec->e_blkno);
2133         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2134         if (e_cpos)
2135                 *e_cpos = le32_to_cpu(rec->e_cpos);
2136 out:
2137         brelse(eb_bh);
2138         return ret;
2139 }
2140
2141 typedef int (xattr_bucket_func)(struct inode *inode,
2142                                 struct ocfs2_xattr_bucket *bucket,
2143                                 void *para);
2144
2145 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2146                                    struct buffer_head *header_bh,
2147                                    int name_index,
2148                                    const char *name,
2149                                    u32 name_hash,
2150                                    u16 *xe_index,
2151                                    int *found)
2152 {
2153         int i, ret = 0, cmp = 1, block_off, new_offset;
2154         struct ocfs2_xattr_header *xh =
2155                         (struct ocfs2_xattr_header *)header_bh->b_data;
2156         size_t name_len = strlen(name);
2157         struct ocfs2_xattr_entry *xe = NULL;
2158         struct buffer_head *name_bh = NULL;
2159         char *xe_name;
2160
2161         /*
2162          * We don't use binary search in the bucket because there
2163          * may be multiple entries with the same name hash.
2164          */
2165         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2166                 xe = &xh->xh_entries[i];
2167
2168                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2169                         continue;
2170                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2171                         break;
2172
2173                 cmp = name_index - ocfs2_xattr_get_type(xe);
2174                 if (!cmp)
2175                         cmp = name_len - xe->xe_name_len;
2176                 if (cmp)
2177                         continue;
2178
2179                 ret = ocfs2_xattr_bucket_get_name_value(inode,
2180                                                         xh,
2181                                                         i,
2182                                                         &block_off,
2183                                                         &new_offset);
2184                 if (ret) {
2185                         mlog_errno(ret);
2186                         break;
2187                 }
2188
2189                 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
2190                                        header_bh->b_blocknr + block_off,
2191                                        &name_bh, OCFS2_BH_CACHED, inode);
2192                 if (ret) {
2193                         mlog_errno(ret);
2194                         break;
2195                 }
2196                 xe_name = name_bh->b_data + new_offset;
2197
2198                 cmp = memcmp(name, xe_name, name_len);
2199                 brelse(name_bh);
2200                 name_bh = NULL;
2201
2202                 if (cmp == 0) {
2203                         *xe_index = i;
2204                         *found = 1;
2205                         ret = 0;
2206                         break;
2207                 }
2208         }
2209
2210         return ret;
2211 }
2212
2213 /*
2214  * Find the specified xattr entry in a series of buckets.
2215  * This series start from p_blkno and last for num_clusters.
2216  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2217  * the num of the valid buckets.
2218  *
2219  * Return the buffer_head this xattr should reside in. And if the xattr's
2220  * hash is in the gap of 2 buckets, return the lower bucket.
2221  */
2222 static int ocfs2_xattr_bucket_find(struct inode *inode,
2223                                    int name_index,
2224                                    const char *name,
2225                                    u32 name_hash,
2226                                    u64 p_blkno,
2227                                    u32 first_hash,
2228                                    u32 num_clusters,
2229                                    struct ocfs2_xattr_search *xs)
2230 {
2231         int ret, found = 0;
2232         struct buffer_head *bh = NULL;
2233         struct buffer_head *lower_bh = NULL;
2234         struct ocfs2_xattr_header *xh = NULL;
2235         struct ocfs2_xattr_entry *xe = NULL;
2236         u16 index = 0;
2237         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2238         int low_bucket = 0, bucket, high_bucket;
2239         u32 last_hash;
2240         u64 blkno;
2241
2242         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno,
2243                                &bh, OCFS2_BH_CACHED, inode);
2244         if (ret) {
2245                 mlog_errno(ret);
2246                 goto out;
2247         }
2248
2249         xh = (struct ocfs2_xattr_header *)bh->b_data;
2250         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2251
2252         while (low_bucket <= high_bucket) {
2253                 brelse(bh);
2254                 bh = NULL;
2255                 bucket = (low_bucket + high_bucket) / 2;
2256
2257                 blkno = p_blkno + bucket * blk_per_bucket;
2258
2259                 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
2260                                        &bh, OCFS2_BH_CACHED, inode);
2261                 if (ret) {
2262                         mlog_errno(ret);
2263                         goto out;
2264                 }
2265
2266                 xh = (struct ocfs2_xattr_header *)bh->b_data;
2267                 xe = &xh->xh_entries[0];
2268                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
2269                         high_bucket = bucket - 1;
2270                         continue;
2271                 }
2272
2273                 /*
2274                  * Check whether the hash of the last entry in our
2275                  * bucket is larger than the search one.
2276                  */
2277                 xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
2278                 last_hash = le32_to_cpu(xe->xe_name_hash);
2279
2280                 /* record lower_bh which may be the insert place. */
2281                 brelse(lower_bh);
2282                 lower_bh = bh;
2283                 bh = NULL;
2284
2285                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
2286                         low_bucket = bucket + 1;
2287                         continue;
2288                 }
2289
2290                 /* the searched xattr should reside in this bucket if exists. */
2291                 ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
2292                                               name_index, name, name_hash,
2293                                               &index, &found);
2294                 if (ret) {
2295                         mlog_errno(ret);
2296                         goto out;
2297                 }
2298                 break;
2299         }
2300
2301         /*
2302          * Record the bucket we have found.
2303          * When the xattr's hash value is in the gap of 2 buckets, we will
2304          * always set it to the previous bucket.
2305          */
2306         if (!lower_bh) {
2307                 /*
2308                  * We can't find any bucket whose first name_hash is less
2309                  * than the find name_hash.
2310                  */
2311                 BUG_ON(bh->b_blocknr != p_blkno);
2312                 lower_bh = bh;
2313                 bh = NULL;
2314         }
2315         xs->bucket.bhs[0] = lower_bh;
2316         xs->bucket.xh = (struct ocfs2_xattr_header *)
2317                                         xs->bucket.bhs[0]->b_data;
2318         lower_bh = NULL;
2319
2320         xs->header = xs->bucket.xh;
2321         xs->base = xs->bucket.bhs[0]->b_data;
2322         xs->end = xs->base + inode->i_sb->s_blocksize;
2323
2324         if (found) {
2325                 /*
2326                  * If we have found the xattr enty, read all the blocks in
2327                  * this bucket.
2328                  */
2329                 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2330                                         xs->bucket.bhs[0]->b_blocknr + 1,
2331                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
2332                                         OCFS2_BH_CACHED, inode);
2333                 if (ret) {
2334                         mlog_errno(ret);
2335                         goto out;
2336                 }
2337
2338                 xs->here = &xs->header->xh_entries[index];
2339                 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
2340                      (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
2341         } else
2342                 ret = -ENODATA;
2343
2344 out:
2345         brelse(bh);
2346         brelse(lower_bh);
2347         return ret;
2348 }
2349
2350 static int ocfs2_xattr_index_block_find(struct inode *inode,
2351                                         struct buffer_head *root_bh,
2352                                         int name_index,
2353                                         const char *name,
2354                                         struct ocfs2_xattr_search *xs)
2355 {
2356         int ret;
2357         struct ocfs2_xattr_block *xb =
2358                         (struct ocfs2_xattr_block *)root_bh->b_data;
2359         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
2360         struct ocfs2_extent_list *el = &xb_root->xt_list;
2361         u64 p_blkno = 0;
2362         u32 first_hash, num_clusters = 0;
2363         u32 name_hash = ocfs2_xattr_hash_by_name(inode, name_index, name);
2364
2365         if (le16_to_cpu(el->l_next_free_rec) == 0)
2366                 return -ENODATA;
2367
2368         mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
2369              name, name_hash, name_index);
2370
2371         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
2372                                   &num_clusters, el);
2373         if (ret) {
2374                 mlog_errno(ret);
2375                 goto out;
2376         }
2377
2378         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
2379
2380         mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
2381              "in the rec is %u\n", num_clusters, p_blkno, first_hash);
2382
2383         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
2384                                       p_blkno, first_hash, num_clusters, xs);
2385
2386 out:
2387         return ret;
2388 }
2389
2390 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
2391                                        u64 blkno,
2392                                        u32 clusters,
2393                                        xattr_bucket_func *func,
2394                                        void *para)
2395 {
2396         int i, j, ret = 0;
2397         int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2398         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
2399         u32 num_buckets = clusters * bpc;
2400         struct ocfs2_xattr_bucket bucket;
2401
2402         memset(&bucket, 0, sizeof(bucket));
2403
2404         mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
2405              clusters, blkno);
2406
2407         for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
2408                 ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2409                                         blkno, blk_per_bucket,
2410                                         bucket.bhs, OCFS2_BH_CACHED, inode);
2411                 if (ret) {
2412                         mlog_errno(ret);
2413                         goto out;
2414                 }
2415
2416                 bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
2417                 /*
2418                  * The real bucket num in this series of blocks is stored
2419                  * in the 1st bucket.
2420                  */
2421                 if (i == 0)
2422                         num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
2423
2424                 mlog(0, "iterating xattr bucket %llu\n", blkno);
2425                 if (func) {
2426                         ret = func(inode, &bucket, para);
2427                         if (ret) {
2428                                 mlog_errno(ret);
2429                                 break;
2430                         }
2431                 }
2432
2433                 for (j = 0; j < blk_per_bucket; j++)
2434                         brelse(bucket.bhs[j]);
2435                 memset(&bucket, 0, sizeof(bucket));
2436         }
2437
2438 out:
2439         for (j = 0; j < blk_per_bucket; j++)
2440                 brelse(bucket.bhs[j]);
2441
2442         return ret;
2443 }
2444
2445 struct ocfs2_xattr_tree_list {
2446         char *buffer;
2447         size_t buffer_size;
2448 };
2449
2450 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
2451                                              struct ocfs2_xattr_header *xh,
2452                                              int index,
2453                                              int *block_off,
2454                                              int *new_offset)
2455 {
2456         u16 name_offset;
2457
2458         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
2459                 return -EINVAL;
2460
2461         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
2462
2463         *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
2464         *new_offset = name_offset % inode->i_sb->s_blocksize;
2465
2466         return 0;
2467 }
2468
2469 static int ocfs2_list_xattr_bucket(struct inode *inode,
2470                                    struct ocfs2_xattr_bucket *bucket,
2471                                    void *para)
2472 {
2473         int ret = 0;
2474         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
2475         size_t size;
2476         int i, block_off, new_offset;
2477
2478         for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
2479                 struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
2480                 struct xattr_handler *handler =
2481                         ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
2482
2483                 if (handler) {
2484                         ret = ocfs2_xattr_bucket_get_name_value(inode,
2485                                                                 bucket->xh,
2486                                                                 i,
2487                                                                 &block_off,
2488                                                                 &new_offset);
2489                         if (ret)
2490                                 break;
2491                         size = handler->list(inode, xl->buffer, xl->buffer_size,
2492                                              bucket->bhs[block_off]->b_data +
2493                                              new_offset,
2494                                              entry->xe_name_len);
2495                         if (xl->buffer) {
2496                                 if (size > xl->buffer_size)
2497                                         return -ERANGE;
2498                                 xl->buffer += size;
2499                         }
2500                         xl->buffer_size -= size;
2501                 }
2502         }
2503
2504         return ret;
2505 }
2506
2507 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
2508                                              struct ocfs2_xattr_tree_root *xt,
2509                                              char *buffer,
2510                                              size_t buffer_size)
2511 {
2512         struct ocfs2_extent_list *el = &xt->xt_list;
2513         int ret = 0;
2514         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
2515         u64 p_blkno = 0;
2516         struct ocfs2_xattr_tree_list xl = {
2517                 .buffer = buffer,
2518                 .buffer_size = buffer_size,
2519         };
2520
2521         if (le16_to_cpu(el->l_next_free_rec) == 0)
2522                 return 0;
2523
2524         while (name_hash > 0) {
2525                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
2526                                           &e_cpos, &num_clusters, el);
2527                 if (ret) {
2528                         mlog_errno(ret);
2529                         goto out;
2530                 }
2531
2532                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
2533                                                   ocfs2_list_xattr_bucket,
2534                                                   &xl);
2535                 if (ret) {
2536                         mlog_errno(ret);
2537                         goto out;
2538                 }
2539
2540                 if (e_cpos == 0)
2541                         break;
2542
2543                 name_hash = e_cpos - 1;
2544         }
2545
2546         ret = buffer_size - xl.buffer_size;
2547 out:
2548         return ret;
2549 }
2550
2551 static int cmp_xe(const void *a, const void *b)
2552 {
2553         const struct ocfs2_xattr_entry *l = a, *r = b;
2554         u32 l_hash = le32_to_cpu(l->xe_name_hash);
2555         u32 r_hash = le32_to_cpu(r->xe_name_hash);
2556
2557         if (l_hash > r_hash)
2558                 return 1;
2559         if (l_hash < r_hash)
2560                 return -1;
2561         return 0;
2562 }
2563
2564 static void swap_xe(void *a, void *b, int size)
2565 {
2566         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
2567
2568         tmp = *l;
2569         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
2570         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
2571 }
2572
2573 /*
2574  * When the ocfs2_xattr_block is filled up, new bucket will be created
2575  * and all the xattr entries will be moved to the new bucket.
2576  * Note: we need to sort the entries since they are not saved in order
2577  * in the ocfs2_xattr_block.
2578  */
2579 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
2580                                            struct buffer_head *xb_bh,
2581                                            struct buffer_head *xh_bh,
2582                                            struct buffer_head *data_bh)
2583 {
2584         int i, blocksize = inode->i_sb->s_blocksize;
2585         u16 offset, size, off_change;
2586         struct ocfs2_xattr_entry *xe;
2587         struct ocfs2_xattr_block *xb =
2588                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
2589         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
2590         struct ocfs2_xattr_header *xh =
2591                                 (struct ocfs2_xattr_header *)xh_bh->b_data;
2592         u16 count = le16_to_cpu(xb_xh->xh_count);
2593         char *target = xh_bh->b_data, *src = xb_bh->b_data;
2594
2595         mlog(0, "cp xattr from block %llu to bucket %llu\n",
2596              (unsigned long long)xb_bh->b_blocknr,
2597              (unsigned long long)xh_bh->b_blocknr);
2598
2599         memset(xh_bh->b_data, 0, blocksize);
2600         if (data_bh)
2601                 memset(data_bh->b_data, 0, blocksize);
2602         /*
2603          * Since the xe_name_offset is based on ocfs2_xattr_header,
2604          * there is a offset change corresponding to the change of
2605          * ocfs2_xattr_header's position.
2606          */
2607         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2608         xe = &xb_xh->xh_entries[count - 1];
2609         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
2610         size = blocksize - offset;
2611
2612         /* copy all the names and values. */
2613         if (data_bh)
2614                 target = data_bh->b_data;
2615         memcpy(target + offset, src + offset, size);
2616
2617         /* Init new header now. */
2618         xh->xh_count = xb_xh->xh_count;
2619         xh->xh_num_buckets = cpu_to_le16(1);
2620         xh->xh_name_value_len = cpu_to_le16(size);
2621         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
2622
2623         /* copy all the entries. */
2624         target = xh_bh->b_data;
2625         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
2626         size = count * sizeof(struct ocfs2_xattr_entry);
2627         memcpy(target + offset, (char *)xb_xh + offset, size);
2628
2629         /* Change the xe offset for all the xe because of the move. */
2630         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
2631                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
2632         for (i = 0; i < count; i++)
2633                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
2634
2635         mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
2636              offset, size, off_change);
2637
2638         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
2639              cmp_xe, swap_xe);
2640 }
2641
2642 /*
2643  * After we move xattr from block to index btree, we have to
2644  * update ocfs2_xattr_search to the new xe and base.
2645  *
2646  * When the entry is in xattr block, xattr_bh indicates the storage place.
2647  * While if the entry is in index b-tree, "bucket" indicates the
2648  * real place of the xattr.
2649  */
2650 static int ocfs2_xattr_update_xattr_search(struct inode *inode,
2651                                            struct ocfs2_xattr_search *xs,
2652                                            struct buffer_head *old_bh,
2653                                            struct buffer_head *new_bh)
2654 {
2655         int ret = 0;
2656         char *buf = old_bh->b_data;
2657         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
2658         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
2659         int i, blocksize = inode->i_sb->s_blocksize;
2660         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2661
2662         xs->bucket.bhs[0] = new_bh;
2663         get_bh(new_bh);
2664         xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
2665         xs->header = xs->bucket.xh;
2666
2667         xs->base = new_bh->b_data;
2668         xs->end = xs->base + inode->i_sb->s_blocksize;
2669
2670         if (!xs->not_found) {
2671                 if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
2672                         ret = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
2673                                         xs->bucket.bhs[0]->b_blocknr + 1,
2674                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
2675                                         OCFS2_BH_CACHED, inode);
2676                         if (ret) {
2677                                 mlog_errno(ret);
2678                                 return ret;
2679                         }
2680
2681                         i = xs->here - old_xh->xh_entries;
2682                         xs->here = &xs->header->xh_entries[i];
2683                 }
2684         }
2685
2686         return ret;
2687 }
2688
2689 static int ocfs2_xattr_create_index_block(struct inode *inode,
2690                                           struct ocfs2_xattr_search *xs)
2691 {
2692         int ret, credits = OCFS2_SUBALLOC_ALLOC;
2693         u32 bit_off, len;
2694         u64 blkno;
2695         handle_t *handle;
2696         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2697         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2698         struct ocfs2_alloc_context *data_ac;
2699         struct buffer_head *xh_bh = NULL, *data_bh = NULL;
2700         struct buffer_head *xb_bh = xs->xattr_bh;
2701         struct ocfs2_xattr_block *xb =
2702                         (struct ocfs2_xattr_block *)xb_bh->b_data;
2703         struct ocfs2_xattr_tree_root *xr;
2704         u16 xb_flags = le16_to_cpu(xb->xb_flags);
2705         u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2706
2707         mlog(0, "create xattr index block for %llu\n",
2708              (unsigned long long)xb_bh->b_blocknr);
2709
2710         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
2711
2712         ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
2713         if (ret) {
2714                 mlog_errno(ret);
2715                 goto out;
2716         }
2717
2718         /*
2719          * XXX:
2720          * We can use this lock for now, and maybe move to a dedicated mutex
2721          * if performance becomes a problem later.
2722          */
2723         down_write(&oi->ip_alloc_sem);
2724
2725         /*
2726          * 3 more credits, one for xattr block update, one for the 1st block
2727          * of the new xattr bucket and one for the value/data.
2728          */
2729         credits += 3;
2730         handle = ocfs2_start_trans(osb, credits);
2731         if (IS_ERR(handle)) {
2732                 ret = PTR_ERR(handle);
2733                 mlog_errno(ret);
2734                 goto out_sem;
2735         }
2736
2737         ret = ocfs2_journal_access(handle, inode, xb_bh,
2738                                    OCFS2_JOURNAL_ACCESS_WRITE);
2739         if (ret) {
2740                 mlog_errno(ret);
2741                 goto out_commit;
2742         }
2743
2744         ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
2745         if (ret) {
2746                 mlog_errno(ret);
2747                 goto out_commit;
2748         }
2749
2750         /*
2751          * The bucket may spread in many blocks, and
2752          * we will only touch the 1st block and the last block
2753          * in the whole bucket(one for entry and one for data).
2754          */
2755         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
2756
2757         mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
2758
2759         xh_bh = sb_getblk(inode->i_sb, blkno);
2760         if (!xh_bh) {
2761                 ret = -EIO;
2762                 mlog_errno(ret);
2763                 goto out_commit;
2764         }
2765
2766         ocfs2_set_new_buffer_uptodate(inode, xh_bh);
2767
2768         ret = ocfs2_journal_access(handle, inode, xh_bh,
2769                                    OCFS2_JOURNAL_ACCESS_CREATE);
2770         if (ret) {
2771                 mlog_errno(ret);
2772                 goto out_commit;
2773         }
2774
2775         if (bpb > 1) {
2776                 data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
2777                 if (!data_bh) {
2778                         ret = -EIO;
2779                         mlog_errno(ret);
2780                         goto out_commit;
2781                 }
2782
2783                 ocfs2_set_new_buffer_uptodate(inode, data_bh);
2784
2785                 ret = ocfs2_journal_access(handle, inode, data_bh,
2786                                            OCFS2_JOURNAL_ACCESS_CREATE);
2787                 if (ret) {
2788                         mlog_errno(ret);
2789                         goto out_commit;
2790                 }
2791         }
2792
2793         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
2794
2795         ocfs2_journal_dirty(handle, xh_bh);
2796         if (data_bh)
2797                 ocfs2_journal_dirty(handle, data_bh);
2798
2799         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
2800
2801         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
2802         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
2803                offsetof(struct ocfs2_xattr_block, xb_attrs));
2804
2805         xr = &xb->xb_attrs.xb_root;
2806         xr->xt_clusters = cpu_to_le32(1);
2807         xr->xt_last_eb_blk = 0;
2808         xr->xt_list.l_tree_depth = 0;
2809         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
2810         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2811
2812         xr->xt_list.l_recs[0].e_cpos = 0;
2813         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
2814         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
2815
2816         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
2817
2818         ret = ocfs2_journal_dirty(handle, xb_bh);
2819         if (ret) {
2820                 mlog_errno(ret);
2821                 goto out_commit;
2822         }
2823
2824 out_commit:
2825         ocfs2_commit_trans(osb, handle);
2826
2827 out_sem:
2828         up_write(&oi->ip_alloc_sem);
2829
2830 out:
2831         if (data_ac)
2832                 ocfs2_free_alloc_context(data_ac);
2833
2834         brelse(xh_bh);
2835         brelse(data_bh);
2836
2837         return ret;
2838 }
2839
2840 static int cmp_xe_offset(const void *a, const void *b)
2841 {
2842         const struct ocfs2_xattr_entry *l = a, *r = b;
2843         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
2844         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
2845
2846         if (l_name_offset < r_name_offset)
2847                 return 1;
2848         if (l_name_offset > r_name_offset)
2849                 return -1;
2850         return 0;
2851 }
2852
2853 /*
2854  * defrag a xattr bucket if we find that the bucket has some
2855  * holes beteen name/value pairs.
2856  * We will move all the name/value pairs to the end of the bucket
2857  * so that we can spare some space for insertion.
2858  */
2859 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
2860                                      struct ocfs2_xattr_bucket *bucket)
2861 {
2862         int ret, i;
2863         size_t end, offset, len, value_len;
2864         struct ocfs2_xattr_header *xh;
2865         char *entries, *buf, *bucket_buf = NULL;
2866         u64 blkno = bucket->bhs[0]->b_blocknr;
2867         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2868         u16 xh_free_start;
2869         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2870         size_t blocksize = inode->i_sb->s_blocksize;
2871         handle_t *handle;
2872         struct buffer_head **bhs;
2873         struct ocfs2_xattr_entry *xe;
2874
2875         bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
2876                         GFP_NOFS);
2877         if (!bhs)
2878                 return -ENOMEM;
2879
2880         ret = ocfs2_read_blocks(osb, blkno, blk_per_bucket, bhs,
2881                                 OCFS2_BH_CACHED, inode);
2882         if (ret)
2883                 goto out;
2884
2885         /*
2886          * In order to make the operation more efficient and generic,
2887          * we copy all the blocks into a contiguous memory and do the
2888          * defragment there, so if anything is error, we will not touch
2889          * the real block.
2890          */
2891         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
2892         if (!bucket_buf) {
2893                 ret = -EIO;
2894                 goto out;
2895         }
2896
2897         buf = bucket_buf;
2898         for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
2899                 memcpy(buf, bhs[i]->b_data, blocksize);
2900
2901         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
2902         if (IS_ERR(handle)) {
2903                 ret = PTR_ERR(handle);
2904                 handle = NULL;
2905                 mlog_errno(ret);
2906                 goto out;
2907         }
2908
2909         for (i = 0; i < blk_per_bucket; i++) {
2910                 ret = ocfs2_journal_access(handle, inode, bhs[i],
2911                                            OCFS2_JOURNAL_ACCESS_WRITE);
2912                 if (ret < 0) {
2913                         mlog_errno(ret);
2914                         goto commit;
2915                 }
2916         }
2917
2918         xh = (struct ocfs2_xattr_header *)bucket_buf;
2919         entries = (char *)xh->xh_entries;
2920         xh_free_start = le16_to_cpu(xh->xh_free_start);
2921
2922         mlog(0, "adjust xattr bucket in %llu, count = %u, "
2923              "xh_free_start = %u, xh_name_value_len = %u.\n",
2924              blkno, le16_to_cpu(xh->xh_count), xh_free_start,
2925              le16_to_cpu(xh->xh_name_value_len));
2926
2927         /*
2928          * sort all the entries by their offset.
2929          * the largest will be the first, so that we can
2930          * move them to the end one by one.
2931          */
2932         sort(entries, le16_to_cpu(xh->xh_count),
2933              sizeof(struct ocfs2_xattr_entry),
2934              cmp_xe_offset, swap_xe);
2935
2936         /* Move all name/values to the end of the bucket. */
2937         xe = xh->xh_entries;
2938         end = OCFS2_XATTR_BUCKET_SIZE;
2939         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
2940                 offset = le16_to_cpu(xe->xe_name_offset);
2941                 if (ocfs2_xattr_is_local(xe))
2942                         value_len = OCFS2_XATTR_SIZE(
2943                                         le64_to_cpu(xe->xe_value_size));
2944                 else
2945                         value_len = OCFS2_XATTR_ROOT_SIZE;
2946                 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
2947
2948                 /*
2949                  * We must make sure that the name/value pair
2950                  * exist in the same block. So adjust end to
2951                  * the previous block end if needed.
2952                  */
2953                 if (((end - len) / blocksize !=
2954                         (end - 1) / blocksize))
2955                         end = end - end % blocksize;
2956
2957                 if (end > offset + len) {
2958                         memmove(bucket_buf + end - len,
2959                                 bucket_buf + offset, len);
2960                         xe->xe_name_offset = cpu_to_le16(end - len);
2961                 }
2962
2963                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
2964                                 "bucket %llu\n", (unsigned long long)blkno);
2965
2966                 end -= len;
2967         }
2968
2969         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
2970                         "bucket %llu\n", (unsigned long long)blkno);
2971
2972         if (xh_free_start == end)
2973                 goto commit;
2974
2975         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
2976         xh->xh_free_start = cpu_to_le16(end);
2977
2978         /* sort the entries by their name_hash. */
2979         sort(entries, le16_to_cpu(xh->xh_count),
2980              sizeof(struct ocfs2_xattr_entry),
2981              cmp_xe, swap_xe);
2982
2983         buf = bucket_buf;
2984         for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
2985                 memcpy(bhs[i]->b_data, buf, blocksize);
2986                 ocfs2_journal_dirty(handle, bhs[i]);
2987         }
2988
2989 commit:
2990         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2991 out:
2992
2993         if (bhs) {
2994                 for (i = 0; i < blk_per_bucket; i++)
2995                         brelse(bhs[i]);
2996         }
2997         kfree(bhs);
2998
2999         kfree(bucket_buf);
3000         return ret;
3001 }
3002
3003 /*
3004  * Move half nums of the xattr bucket in the previous cluster to this new
3005  * cluster. We only touch the last cluster of the previous extend record.
3006  *
3007  * first_bh is the first buffer_head of a series of bucket in the same
3008  * extent rec and header_bh is the header of one bucket in this cluster.
3009  * They will be updated if we move the data header_bh contains to the new
3010  * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
3011  */
3012 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3013                                                handle_t *handle,
3014                                                struct buffer_head **first_bh,
3015                                                struct buffer_head **header_bh,
3016                                                u64 new_blkno,
3017                                                u64 prev_blkno,
3018                                                u32 num_clusters,
3019                                                u32 *first_hash)
3020 {
3021         int i, ret, credits;
3022         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3023         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3024         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3025         int blocksize = inode->i_sb->s_blocksize;
3026         struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
3027         struct ocfs2_xattr_header *new_xh;
3028         struct ocfs2_xattr_header *xh =
3029                         (struct ocfs2_xattr_header *)((*first_bh)->b_data);
3030
3031         BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
3032         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
3033
3034         prev_bh = *first_bh;
3035         get_bh(prev_bh);
3036         xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
3037
3038         prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
3039
3040         mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3041              prev_blkno, new_blkno);
3042
3043         /*
3044          * We need to update the 1st half of the new cluster and
3045          * 1 more for the update of the 1st bucket of the previous
3046          * extent record.
3047          */
3048         credits = bpc / 2 + 1;
3049         ret = ocfs2_extend_trans(handle, credits);
3050         if (ret) {
3051                 mlog_errno(ret);
3052                 goto out;
3053         }
3054
3055         ret = ocfs2_journal_access(handle, inode, prev_bh,
3056                                    OCFS2_JOURNAL_ACCESS_WRITE);
3057         if (ret) {
3058                 mlog_errno(ret);
3059                 goto out;
3060         }
3061
3062         for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
3063                 old_bh = new_bh = NULL;
3064                 new_bh = sb_getblk(inode->i_sb, new_blkno);
3065                 if (!new_bh) {
3066                         ret = -EIO;
3067                         mlog_errno(ret);
3068                         goto out;
3069                 }
3070
3071                 ocfs2_set_new_buffer_uptodate(inode, new_bh);
3072
3073                 ret = ocfs2_journal_access(handle, inode, new_bh,
3074                                            OCFS2_JOURNAL_ACCESS_CREATE);
3075                 if (ret < 0) {
3076                         mlog_errno(ret);
3077                         brelse(new_bh);
3078                         goto out;
3079                 }
3080
3081                 ret = ocfs2_read_block(osb, prev_blkno,
3082                                        &old_bh, OCFS2_BH_CACHED, inode);
3083                 if (ret < 0) {
3084                         mlog_errno(ret);
3085                         brelse(new_bh);
3086                         goto out;
3087                 }
3088
3089                 memcpy(new_bh->b_data, old_bh->b_data, blocksize);
3090
3091                 if (i == 0) {
3092                         new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
3093                         new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
3094
3095                         if (first_hash)
3096                                 *first_hash = le32_to_cpu(
3097                                         new_xh->xh_entries[0].xe_name_hash);
3098                         new_first_bh = new_bh;
3099                         get_bh(new_first_bh);
3100                 }
3101
3102                 ocfs2_journal_dirty(handle, new_bh);
3103
3104                 if (*header_bh == old_bh) {
3105                         brelse(*header_bh);
3106                         *header_bh = new_bh;
3107                         get_bh(*header_bh);
3108
3109                         brelse(*first_bh);
3110                         *first_bh = new_first_bh;
3111                         get_bh(*first_bh);
3112                 }
3113                 brelse(new_bh);
3114                 brelse(old_bh);
3115         }
3116
3117         le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
3118
3119         ocfs2_journal_dirty(handle, prev_bh);
3120 out:
3121         brelse(prev_bh);
3122         brelse(new_first_bh);
3123         return ret;
3124 }
3125
3126 static int ocfs2_read_xattr_bucket(struct inode *inode,
3127                                    u64 blkno,
3128                                    struct buffer_head **bhs,
3129                                    int new)
3130 {
3131         int ret = 0;
3132         u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3133
3134         if (!new)
3135                 return ocfs2_read_blocks(OCFS2_SB(inode->i_sb), blkno,
3136                                          blk_per_bucket, bhs,
3137                                          OCFS2_BH_CACHED, inode);
3138
3139         for (i = 0; i < blk_per_bucket; i++) {
3140                 bhs[i] = sb_getblk(inode->i_sb, blkno + i);
3141                 if (bhs[i] == NULL) {
3142                         ret = -EIO;
3143                         mlog_errno(ret);
3144                         break;
3145                 }
3146                 ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
3147         }
3148
3149         return ret;
3150 }
3151
3152 /*
3153  * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
3154  * first_hash will record the 1st hash of the new bucket.
3155  */
3156 static int ocfs2_half_xattr_bucket(struct inode *inode,
3157                                    handle_t *handle,
3158                                    u64 blk,
3159                                    u64 new_blk,
3160                                    u32 *first_hash,
3161                                    int new_bucket_head)
3162 {
3163         int ret, i;
3164         u16 count, start, len, name_value_len, xe_len, name_offset;
3165         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3166         struct buffer_head **s_bhs, **t_bhs = NULL;
3167         struct ocfs2_xattr_header *xh;
3168         struct ocfs2_xattr_entry *xe;
3169         int blocksize = inode->i_sb->s_blocksize;
3170
3171         mlog(0, "move half of xattrs from bucket %llu to %llu\n",
3172              blk, new_blk);
3173
3174         s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3175         if (!s_bhs)
3176                 return -ENOMEM;
3177
3178         ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
3179         if (ret) {
3180                 mlog_errno(ret);
3181                 goto out;
3182         }
3183
3184         ret = ocfs2_journal_access(handle, inode, s_bhs[0],
3185                                    OCFS2_JOURNAL_ACCESS_WRITE);
3186         if (ret) {
3187                 mlog_errno(ret);
3188                 goto out;
3189         }
3190
3191         t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
3192         if (!t_bhs) {
3193                 ret = -ENOMEM;
3194                 goto out;
3195         }
3196
3197         ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
3198         if (ret) {
3199                 mlog_errno(ret);
3200                 goto out;
3201         }
3202
3203         for (i = 0; i < blk_per_bucket; i++) {
3204                 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3205                                            OCFS2_JOURNAL_ACCESS_CREATE);
3206                 if (ret) {
3207                         mlog_errno(ret);
3208                         goto out;
3209                 }
3210         }
3211
3212         /* copy the whole bucket to the new first. */
3213         for (i = 0; i < blk_per_bucket; i++)
3214                 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3215
3216         /* update the new bucket. */
3217         xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
3218         count = le16_to_cpu(xh->xh_count);
3219         start = count / 2;
3220
3221         /*
3222          * Calculate the total name/value len and xh_free_start for
3223          * the old bucket first.
3224          */
3225         name_offset = OCFS2_XATTR_BUCKET_SIZE;
3226         name_value_len = 0;
3227         for (i = 0; i < start; i++) {
3228                 xe = &xh->xh_entries[i];
3229                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3230                 if (ocfs2_xattr_is_local(xe))
3231                         xe_len +=
3232                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3233                 else
3234                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3235                 name_value_len += xe_len;
3236                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3237                         name_offset = le16_to_cpu(xe->xe_name_offset);
3238         }
3239
3240         /*
3241          * Now begin the modification to the new bucket.
3242          *
3243          * In the new bucket, We just move the xattr entry to the beginning
3244          * and don't touch the name/value. So there will be some holes in the
3245          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3246          * called.
3247          */
3248         xe = &xh->xh_entries[start];
3249         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3250         mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3251              (char *)xe - (char *)xh, (char *)xh->xh_entries - (char *)xh);
3252         memmove((char *)xh->xh_entries, (char *)xe, len);
3253         xe = &xh->xh_entries[count - start];
3254         len = sizeof(struct ocfs2_xattr_entry) * start;
3255         memset((char *)xe, 0, len);
3256
3257         le16_add_cpu(&xh->xh_count, -start);
3258         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3259
3260         /* Calculate xh_free_start for the new bucket. */
3261         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3262         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3263                 xe = &xh->xh_entries[i];
3264                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3265                 if (ocfs2_xattr_is_local(xe))
3266                         xe_len +=
3267                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3268                 else
3269                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3270                 if (le16_to_cpu(xe->xe_name_offset) <
3271                     le16_to_cpu(xh->xh_free_start))
3272                         xh->xh_free_start = xe->xe_name_offset;
3273         }
3274
3275         /* set xh->xh_num_buckets for the new xh. */
3276         if (new_bucket_head)
3277                 xh->xh_num_buckets = cpu_to_le16(1);
3278         else
3279                 xh->xh_num_buckets = 0;
3280
3281         for (i = 0; i < blk_per_bucket; i++) {
3282                 ocfs2_journal_dirty(handle, t_bhs[i]);
3283                 if (ret)
3284                         mlog_errno(ret);
3285         }
3286
3287         /* store the first_hash of the new bucket. */
3288         if (first_hash)
3289                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3290
3291         /*
3292          * Now only update the 1st block of the old bucket.
3293          * Please note that the entry has been sorted already above.
3294          */
3295         xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
3296         memset(&xh->xh_entries[start], 0,
3297                sizeof(struct ocfs2_xattr_entry) * (count - start));
3298         xh->xh_count = cpu_to_le16(start);
3299         xh->xh_free_start = cpu_to_le16(name_offset);
3300         xh->xh_name_value_len = cpu_to_le16(name_value_len);
3301
3302         ocfs2_journal_dirty(handle, s_bhs[0]);
3303         if (ret)
3304                 mlog_errno(ret);
3305
3306 out:
3307         if (s_bhs) {
3308                 for (i = 0; i < blk_per_bucket; i++)
3309                         brelse(s_bhs[i]);
3310         }
3311         kfree(s_bhs);
3312
3313         if (t_bhs) {
3314                 for (i = 0; i < blk_per_bucket; i++)
3315                         brelse(t_bhs[i]);
3316         }
3317         kfree(t_bhs);
3318
3319         return ret;
3320 }
3321
3322 /*
3323  * Copy xattr from one bucket to another bucket.
3324  *
3325  * The caller must make sure that the journal transaction
3326  * has enough space for journaling.
3327  */
3328 static int ocfs2_cp_xattr_bucket(struct inode *inode,
3329                                  handle_t *handle,
3330                                  u64 s_blkno,
3331                                  u64 t_blkno,
3332                                  int t_is_new)
3333 {
3334         int ret, i;
3335         int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3336         int blocksize = inode->i_sb->s_blocksize;
3337         struct buffer_head **s_bhs, **t_bhs = NULL;
3338
3339         BUG_ON(s_blkno == t_blkno);
3340
3341         mlog(0, "cp bucket %llu to %llu, target is %d\n",
3342              s_blkno, t_blkno, t_is_new);
3343
3344         s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3345                         GFP_NOFS);
3346         if (!s_bhs)
3347                 return -ENOMEM;
3348
3349         ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
3350         if (ret)
3351                 goto out;
3352
3353         t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
3354                         GFP_NOFS);
3355         if (!t_bhs) {
3356                 ret = -ENOMEM;
3357                 goto out;
3358         }
3359
3360         ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
3361         if (ret)
3362                 goto out;
3363
3364         for (i = 0; i < blk_per_bucket; i++) {
3365                 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
3366                                            OCFS2_JOURNAL_ACCESS_WRITE);
3367                 if (ret)
3368                         goto out;
3369         }
3370
3371         for (i = 0; i < blk_per_bucket; i++) {
3372                 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
3373                 ocfs2_journal_dirty(handle, t_bhs[i]);
3374         }
3375
3376 out:
3377         if (s_bhs) {
3378                 for (i = 0; i < blk_per_bucket; i++)
3379                         brelse(s_bhs[i]);
3380         }
3381         kfree(s_bhs);
3382
3383         if (t_bhs) {
3384                 for (i = 0; i < blk_per_bucket; i++)
3385                         brelse(t_bhs[i]);
3386         }
3387         kfree(t_bhs);
3388
3389         return ret;
3390 }
3391
3392 /*
3393  * Copy one xattr cluster from src_blk to to_blk.
3394  * The to_blk will become the first bucket header of the cluster, so its
3395  * xh_num_buckets will be initialized as the bucket num in the cluster.
3396  */
3397 static int ocfs2_cp_xattr_cluster(struct inode *inode,
3398                                   handle_t *handle,
3399                                   struct buffer_head *first_bh,
3400                                   u64 src_blk,
3401                                   u64 to_blk,
3402                                   u32 *first_hash)
3403 {
3404         int i, ret, credits;
3405         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3406         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3407         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3408         struct buffer_head *bh = NULL;
3409         struct ocfs2_xattr_header *xh;
3410         u64 to_blk_start = to_blk;
3411
3412         mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
3413
3414         /*
3415          * We need to update the new cluster and 1 more for the update of
3416          * the 1st bucket of the previous extent rec.
3417          */
3418         credits = bpc + 1;
3419         ret = ocfs2_extend_trans(handle, credits);
3420         if (ret) {
3421                 mlog_errno(ret);
3422                 goto out;
3423         }
3424
3425         ret = ocfs2_journal_access(handle, inode, first_bh,
3426                                    OCFS2_JOURNAL_ACCESS_WRITE);
3427         if (ret) {
3428                 mlog_errno(ret);
3429                 goto out;
3430         }
3431
3432         for (i = 0; i < num_buckets; i++) {
3433                 ret = ocfs2_cp_xattr_bucket(inode, handle,
3434                                             src_blk, to_blk, 1);
3435                 if (ret) {
3436                         mlog_errno(ret);
3437                         goto out;
3438                 }
3439
3440                 src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3441                 to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3442         }
3443
3444         /* update the old bucket header. */
3445         xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3446         le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
3447
3448         ocfs2_journal_dirty(handle, first_bh);
3449
3450         /* update the new bucket header. */
3451         ret = ocfs2_read_block(osb, to_blk_start, &bh, OCFS2_BH_CACHED, inode);
3452         if (ret < 0) {
3453                 mlog_errno(ret);
3454                 goto out;
3455         }
3456
3457         ret = ocfs2_journal_access(handle, inode, bh,
3458                                    OCFS2_JOURNAL_ACCESS_WRITE);
3459         if (ret) {
3460                 mlog_errno(ret);
3461                 goto out;
3462         }
3463
3464         xh = (struct ocfs2_xattr_header *)bh->b_data;
3465         xh->xh_num_buckets = cpu_to_le16(num_buckets);
3466
3467         ocfs2_journal_dirty(handle, bh);
3468
3469         if (first_hash)
3470                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3471 out:
3472         brelse(bh);
3473         return ret;
3474 }
3475
3476 /*
3477  * Move half of the xattrs in this cluster to the new cluster.
3478  * This function should only be called when bucket size == cluster size.
3479  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
3480  */
3481 static int ocfs2_half_xattr_cluster(struct inode *inode,
3482                                     handle_t *handle,
3483                                     u64 prev_blk,
3484                                     u64 new_blk,
3485                                     u32 *first_hash)
3486 {
3487         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3488         int ret, credits = 2 * blk_per_bucket;
3489
3490         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
3491
3492         ret = ocfs2_extend_trans(handle, credits);
3493         if (ret) {
3494                 mlog_errno(ret);
3495                 return ret;
3496         }
3497
3498         /* Move half of the xattr in start_blk to the next bucket. */
3499         return  ocfs2_half_xattr_bucket(inode, handle, prev_blk,
3500                                         new_blk, first_hash, 1);
3501 }
3502
3503 /*
3504  * Move some xattrs from the old cluster to the new one since they are not
3505  * contiguous in ocfs2 xattr tree.
3506  *
3507  * new_blk starts a new separate cluster, and we will move some xattrs from
3508  * prev_blk to it. v_start will be set as the first name hash value in this
3509  * new cluster so that it can be used as e_cpos during tree insertion and
3510  * don't collide with our original b-tree operations. first_bh and header_bh
3511  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
3512  * to extend the insert bucket.
3513  *
3514  * The problem is how much xattr should we move to the new one and when should
3515  * we update first_bh and header_bh?
3516  * 1. If cluster size > bucket size, that means the previous cluster has more
3517  *    than 1 bucket, so just move half nums of bucket into the new cluster and
3518  *    update the first_bh and header_bh if the insert bucket has been moved
3519  *    to the new cluster.
3520  * 2. If cluster_size == bucket_size:
3521  *    a) If the previous extent rec has more than one cluster and the insert
3522  *       place isn't in the last cluster, copy the entire last cluster to the
3523  *       new one. This time, we don't need to upate the first_bh and header_bh
3524  *       since they will not be moved into the new cluster.
3525  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
3526  *       the new one. And we set the extend flag to zero if the insert place is
3527  *       moved into the new allocated cluster since no extend is needed.
3528  */
3529 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
3530                                             handle_t *handle,
3531                                             struct buffer_head **first_bh,
3532                                             struct buffer_head **header_bh,
3533                                             u64 new_blk,
3534                                             u64 prev_blk,
3535                                             u32 prev_clusters,
3536                                             u32 *v_start,
3537                                             int *extend)
3538 {
3539         int ret = 0;
3540         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3541
3542         mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
3543              prev_blk, prev_clusters, new_blk);
3544
3545         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
3546                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
3547                                                           handle,
3548                                                           first_bh,
3549                                                           header_bh,
3550                                                           new_blk,
3551                                                           prev_blk,
3552                                                           prev_clusters,
3553                                                           v_start);
3554         else {
3555                 u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
3556
3557                 if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
3558                         ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
3559                                                      last_blk, new_blk,
3560                                                      v_start);
3561                 else {
3562                         ret = ocfs2_half_xattr_cluster(inode, handle,
3563                                                        last_blk, new_blk,
3564                                                        v_start);
3565
3566                         if ((*header_bh)->b_blocknr == last_blk && extend)
3567                                 *extend = 0;
3568                 }
3569         }
3570
3571         return ret;
3572 }
3573
3574 /*
3575  * Add a new cluster for xattr storage.
3576  *
3577  * If the new cluster is contiguous with the previous one, it will be
3578  * appended to the same extent record, and num_clusters will be updated.
3579  * If not, we will insert a new extent for it and move some xattrs in
3580  * the last cluster into the new allocated one.
3581  * We also need to limit the maximum size of a btree leaf, otherwise we'll
3582  * lose the benefits of hashing because we'll have to search large leaves.
3583  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
3584  * if it's bigger).
3585  *
3586  * first_bh is the first block of the previous extent rec and header_bh
3587  * indicates the bucket we will insert the new xattrs. They will be updated
3588  * when the header_bh is moved into the new cluster.
3589  */
3590 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
3591                                        struct buffer_head *root_bh,
3592                                        struct buffer_head **first_bh,
3593                                        struct buffer_head **header_bh,
3594                                        u32 *num_clusters,
3595                                        u32 prev_cpos,
3596                                        u64 prev_blkno,
3597                                        int *extend)
3598 {
3599         int ret, credits;
3600         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
3601         u32 prev_clusters = *num_clusters;
3602         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
3603         u64 block;
3604         handle_t *handle = NULL;
3605         struct ocfs2_alloc_context *data_ac = NULL;
3606         struct ocfs2_alloc_context *meta_ac = NULL;
3607         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3608         struct ocfs2_xattr_block *xb =
3609                         (struct ocfs2_xattr_block *)root_bh->b_data;
3610         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3611         struct ocfs2_extent_list *root_el = &xb_root->xt_list;
3612         enum ocfs2_extent_tree_type type = OCFS2_XATTR_TREE_EXTENT;
3613
3614         mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
3615              "previous xattr blkno = %llu\n",
3616              (unsigned long long)OCFS2_I(inode)->ip_blkno,
3617              prev_cpos, prev_blkno);
3618
3619         ret = ocfs2_lock_allocators(inode, root_bh, root_el,
3620                                     clusters_to_add, 0, &data_ac,
3621                                     &meta_ac, type, NULL);
3622         if (ret) {
3623                 mlog_errno(ret);
3624                 goto leave;
3625         }
3626
3627         credits = ocfs2_calc_extend_credits(osb->sb, root_el, clusters_to_add);
3628         handle = ocfs2_start_trans(osb, credits);
3629         if (IS_ERR(handle)) {
3630                 ret = PTR_ERR(handle);
3631                 handle = NULL;
3632                 mlog_errno(ret);
3633                 goto leave;
3634         }
3635
3636         ret = ocfs2_journal_access(handle, inode, root_bh,
3637                                    OCFS2_JOURNAL_ACCESS_WRITE);
3638         if (ret < 0) {
3639                 mlog_errno(ret);
3640                 goto leave;
3641         }
3642
3643         ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
3644                                      clusters_to_add, &bit_off, &num_bits);
3645         if (ret < 0) {
3646                 if (ret != -ENOSPC)
3647                         mlog_errno(ret);
3648                 goto leave;
3649         }
3650
3651         BUG_ON(num_bits > clusters_to_add);
3652
3653         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
3654         mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
3655              num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
3656
3657         if (prev_blkno + prev_clusters * bpc == block &&
3658             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
3659              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
3660                 /*
3661                  * If this cluster is contiguous with the old one and
3662                  * adding this new cluster, we don't surpass the limit of
3663                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
3664                  * initialized and used like other buckets in the previous
3665                  * cluster.
3666                  * So add it as a contiguous one. The caller will handle
3667                  * its init process.
3668                  */
3669                 v_start = prev_cpos + prev_clusters;
3670                 *num_clusters = prev_clusters + num_bits;
3671                 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
3672                      num_bits);
3673         } else {
3674                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
3675                                                        handle,
3676                                                        first_bh,
3677                                                        header_bh,
3678                                                        block,
3679                                                        prev_blkno,
3680                                                        prev_clusters,
3681                                                        &v_start,
3682                                                        extend);
3683                 if (ret) {
3684                         mlog_errno(ret);
3685                         goto leave;
3686                 }
3687         }
3688
3689         mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
3690              num_bits, block, v_start);
3691         ret = ocfs2_xattr_tree_insert_extent(osb, handle, inode, root_bh,
3692                                              v_start, block, num_bits,
3693                                              0, meta_ac);
3694         if (ret < 0) {
3695                 mlog_errno(ret);
3696                 goto leave;
3697         }
3698
3699         ret = ocfs2_journal_dirty(handle, root_bh);
3700         if (ret < 0) {
3701                 mlog_errno(ret);
3702                 goto leave;
3703         }
3704
3705 leave:
3706         if (handle)
3707                 ocfs2_commit_trans(osb, handle);
3708         if (data_ac)
3709                 ocfs2_free_alloc_context(data_ac);
3710         if (meta_ac)
3711                 ocfs2_free_alloc_context(meta_ac);
3712
3713         return ret;
3714 }
3715
3716 /*
3717  * Extend a new xattr bucket and move xattrs to the end one by one until
3718  * We meet with start_bh. Only move half of the xattrs to the bucket after it.
3719  */
3720 static int ocfs2_extend_xattr_bucket(struct inode *inode,
3721                                      struct buffer_head *first_bh,
3722                                      struct buffer_head *start_bh,
3723                                      u32 num_clusters)
3724 {
3725         int ret, credits;
3726         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3727         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3728         u64 start_blk = start_bh->b_blocknr, end_blk;
3729         u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
3730         handle_t *handle;
3731         struct ocfs2_xattr_header *first_xh =
3732                                 (struct ocfs2_xattr_header *)first_bh->b_data;
3733         u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
3734
3735         mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
3736              "from %llu, len = %u\n", start_blk,
3737              (unsigned long long)first_bh->b_blocknr, num_clusters);
3738
3739         BUG_ON(bucket >= num_buckets);
3740
3741         end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
3742
3743         /*
3744          * We will touch all the buckets after the start_bh(include it).
3745          * Add one more bucket and modify the first_bh.
3746          */
3747         credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
3748         handle = ocfs2_start_trans(osb, credits);
3749         if (IS_ERR(handle)) {
3750                 ret = PTR_ERR(handle);
3751                 handle = NULL;
3752                 mlog_errno(ret);
3753                 goto out;
3754         }
3755
3756         ret = ocfs2_journal_access(handle, inode, first_bh,
3757                                    OCFS2_JOURNAL_ACCESS_WRITE);
3758         if (ret) {
3759                 mlog_errno(ret);
3760                 goto commit;
3761         }
3762
3763         while (end_blk != start_blk) {
3764                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
3765                                             end_blk + blk_per_bucket, 0);
3766                 if (ret)
3767                         goto commit;
3768                 end_blk -= blk_per_bucket;
3769         }
3770
3771         /* Move half of the xattr in start_blk to the next bucket. */
3772         ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
3773                                       start_blk + blk_per_bucket, NULL, 0);
3774
3775         le16_add_cpu(&first_xh->xh_num_buckets, 1);
3776         ocfs2_journal_dirty(handle, first_bh);
3777
3778 commit:
3779         ocfs2_commit_trans(osb, handle);
3780 out:
3781         return ret;
3782 }
3783
3784 /*
3785  * Add new xattr bucket in an extent record and adjust the buckets accordingly.
3786  * xb_bh is the ocfs2_xattr_block.
3787  * We will move all the buckets starting from header_bh to the next place. As
3788  * for this one, half num of its xattrs will be moved to the next one.
3789  *
3790  * We will allocate a new cluster if current cluster is full and adjust
3791  * header_bh and first_bh if the insert place is moved to the new cluster.
3792  */
3793 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
3794                                       struct buffer_head *xb_bh,
3795                                       struct buffer_head *header_bh)
3796 {
3797         struct ocfs2_xattr_header *first_xh = NULL;
3798         struct buffer_head *first_bh = NULL;
3799         struct ocfs2_xattr_block *xb =
3800                         (struct ocfs2_xattr_block *)xb_bh->b_data;
3801         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3802         struct ocfs2_extent_list *el = &xb_root->xt_list;
3803         struct ocfs2_xattr_header *xh =
3804                         (struct ocfs2_xattr_header *)header_bh->b_data;
3805         u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3806         struct super_block *sb = inode->i_sb;
3807         struct ocfs2_super *osb = OCFS2_SB(sb);
3808         int ret, num_buckets, extend = 1;
3809         u64 p_blkno;
3810         u32 e_cpos, num_clusters;
3811
3812         mlog(0, "Add new xattr bucket starting form %llu\n",
3813              (unsigned long long)header_bh->b_blocknr);
3814
3815         /*
3816          * Add refrence for header_bh here because it may be
3817          * changed in ocfs2_add_new_xattr_cluster and we need
3818          * to free it in the end.
3819          */
3820         get_bh(header_bh);
3821
3822         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
3823                                   &num_clusters, el);
3824         if (ret) {
3825                 mlog_errno(ret);
3826                 goto out;
3827         }
3828
3829         ret = ocfs2_read_block(osb, p_blkno,
3830                                &first_bh, OCFS2_BH_CACHED, inode);
3831         if (ret) {
3832                 mlog_errno(ret);
3833                 goto out;
3834         }
3835
3836         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
3837         first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
3838
3839         if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
3840                 ret = ocfs2_add_new_xattr_cluster(inode,
3841                                                   xb_bh,
3842                                                   &first_bh,
3843                                                   &header_bh,
3844                                                   &num_clusters,
3845                                                   e_cpos,
3846                                                   p_blkno,
3847                                                   &extend);
3848                 if (ret) {
3849                         mlog_errno(ret);
3850                         goto out;
3851                 }
3852         }
3853
3854         if (extend)
3855                 ret = ocfs2_extend_xattr_bucket(inode,
3856                                                 first_bh,
3857                                                 header_bh,
3858                                                 num_clusters);
3859         if (ret)
3860                 mlog_errno(ret);
3861 out:
3862         brelse(first_bh);
3863         brelse(header_bh);
3864         return ret;
3865 }
3866
3867 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
3868                                         struct ocfs2_xattr_bucket *bucket,
3869                                         int offs)
3870 {
3871         int block_off = offs >> inode->i_sb->s_blocksize_bits;
3872
3873         offs = offs % inode->i_sb->s_blocksize;
3874         return bucket->bhs[block_off]->b_data + offs;
3875 }
3876
3877 /*
3878  * Handle the normal xattr set, including replace, delete and new.
3879  * When the bucket is empty, "is_empty" is set and the caller can
3880  * free this bucket.
3881  *
3882  * Note: "local" indicates the real data's locality. So we can't
3883  * just its bucket locality by its length.
3884  */
3885 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
3886                                          struct ocfs2_xattr_info *xi,
3887                                          struct ocfs2_xattr_search *xs,
3888                                          u32 name_hash,
3889                                          int local,
3890                                          int *is_empty)
3891 {
3892         struct ocfs2_xattr_entry *last, *xe;
3893         int name_len = strlen(xi->name);
3894         struct ocfs2_xattr_header *xh = xs->header;
3895         u16 count = le16_to_cpu(xh->xh_count), start;
3896         size_t blocksize = inode->i_sb->s_blocksize;
3897         char *val;
3898         size_t offs, size, new_size;
3899
3900         last = &xh->xh_entries[count];
3901         if (!xs->not_found) {
3902                 xe = xs->here;
3903                 offs = le16_to_cpu(xe->xe_name_offset);
3904                 if (ocfs2_xattr_is_local(xe))
3905                         size = OCFS2_XATTR_SIZE(name_len) +
3906                         OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3907                 else
3908                         size = OCFS2_XATTR_SIZE(name_len) +
3909                         OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
3910
3911                 /*
3912                  * If the new value will be stored outside, xi->value has been
3913                  * initalized as an empty ocfs2_xattr_value_root, and the same
3914                  * goes with xi->value_len, so we can set new_size safely here.
3915                  * See ocfs2_xattr_set_in_bucket.
3916                  */
3917                 new_size = OCFS2_XATTR_SIZE(name_len) +
3918                            OCFS2_XATTR_SIZE(xi->value_len);
3919
3920                 le16_add_cpu(&xh->xh_name_value_len, -size);
3921                 if (xi->value) {
3922                         if (new_size > size)
3923                                 goto set_new_name_value;
3924
3925                         /* Now replace the old value with new one. */
3926                         if (local)
3927                                 xe->xe_value_size = cpu_to_le64(xi->value_len);
3928                         else
3929                                 xe->xe_value_size = 0;
3930
3931                         val = ocfs2_xattr_bucket_get_val(inode,
3932                                                          &xs->bucket, offs);
3933                         memset(val + OCFS2_XATTR_SIZE(name_len), 0,
3934                                size - OCFS2_XATTR_SIZE(name_len));
3935                         if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
3936                                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
3937                                        xi->value, xi->value_len);
3938
3939                         le16_add_cpu(&xh->xh_name_value_len, new_size);
3940                         ocfs2_xattr_set_local(xe, local);
3941                         return;
3942                 } else {
3943                         /* Remove the old entry. */
3944                         last -= 1;
3945                         memmove(xe, xe + 1,
3946                                 (void *)last - (void *)xe);
3947                         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
3948                         le16_add_cpu(&xh->xh_count, -1);
3949                         if (xh->xh_count == 0 && is_empty)
3950                                 *is_empty = 1;
3951                         return;
3952                 }
3953         } else {
3954                 /* find a new entry for insert. */
3955                 int low = 0, high = count - 1, tmp;
3956                 struct ocfs2_xattr_entry *tmp_xe;
3957
3958                 while (low <= high) {
3959                         tmp = (low + high) / 2;
3960                         tmp_xe = &xh->xh_entries[tmp];
3961
3962                         if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
3963                                 low = tmp + 1;
3964                         else if (name_hash <
3965                                  le32_to_cpu(tmp_xe->xe_name_hash))
3966                                 high = tmp - 1;
3967                         else
3968                                 break;
3969                 }
3970
3971                 xe = &xh->xh_entries[low];
3972                 if (low != count)
3973                         memmove(xe + 1, xe, (void *)last - (void *)xe);
3974
3975                 le16_add_cpu(&xh->xh_count, 1);
3976                 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
3977                 xe->xe_name_hash = cpu_to_le32(name_hash);
3978                 xe->xe_name_len = name_len;
3979                 ocfs2_xattr_set_type(xe, xi->name_index);
3980         }
3981
3982 set_new_name_value:
3983         /* Insert the new name+value. */
3984         size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
3985
3986         /*
3987          * We must make sure that the name/value pair
3988          * exists in the same block.
3989          */
3990         offs = le16_to_cpu(xh->xh_free_start);
3991         start = offs - size;
3992
3993         if (start >> inode->i_sb->s_blocksize_bits !=
3994             (offs - 1) >> inode->i_sb->s_blocksize_bits) {
3995                 offs = offs - offs % blocksize;
3996                 xh->xh_free_start = cpu_to_le16(offs);
3997         }
3998
3999         val = ocfs2_xattr_bucket_get_val(inode,
4000                                          &xs->bucket, offs - size);
4001         xe->xe_name_offset = cpu_to_le16(offs - size);
4002
4003         memset(val, 0, size);
4004         memcpy(val, xi->name, name_len);
4005         memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4006
4007         xe->xe_value_size = cpu_to_le64(xi->value_len);
4008         ocfs2_xattr_set_local(xe, local);
4009         xs->here = xe;
4010         le16_add_cpu(&xh->xh_free_start, -size);
4011         le16_add_cpu(&xh->xh_name_value_len, size);
4012
4013         return;
4014 }
4015
4016 static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
4017                                              handle_t *handle,
4018                                              struct ocfs2_xattr_search *xs,
4019                                              struct buffer_head **bhs,
4020                                              u16 bh_num)
4021 {
4022         int ret = 0, off, block_off;
4023         struct ocfs2_xattr_entry *xe = xs->here;
4024
4025         /*
4026          * First calculate all the blocks we should journal_access
4027          * and journal_dirty. The first block should always be touched.
4028          */
4029         ret = ocfs2_journal_dirty(handle, bhs[0]);
4030         if (ret)
4031                 mlog_errno(ret);
4032
4033         /* calc the data. */
4034         off = le16_to_cpu(xe->xe_name_offset);
4035         block_off = off >> inode->i_sb->s_blocksize_bits;
4036         ret = ocfs2_journal_dirty(handle, bhs[block_off]);
4037         if (ret)
4038                 mlog_errno(ret);
4039
4040         return ret;
4041 }
4042
4043 /*
4044  * Set the xattr entry in the specified bucket.
4045  * The bucket is indicated by xs->bucket and it should have the enough
4046  * space for the xattr insertion.
4047  */
4048 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4049                                            struct ocfs2_xattr_info *xi,
4050                                            struct ocfs2_xattr_search *xs,
4051                                            u32 name_hash,
4052                                            int local,
4053                                            int *bucket_empty)
4054 {
4055         int i, ret;
4056         handle_t *handle = NULL;
4057         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4058         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4059
4060         mlog(0, "Set xattr entry len = %d index = %d in bucket %llu\n",
4061              xi->value_len, xi->name_index,
4062              (unsigned long long)xs->bucket.bhs[0]->b_blocknr);
4063
4064         if (!xs->bucket.bhs[1]) {
4065                 ret = ocfs2_read_blocks(osb,
4066                                         xs->bucket.bhs[0]->b_blocknr + 1,
4067                                         blk_per_bucket - 1, &xs->bucket.bhs[1],
4068                                         OCFS2_BH_CACHED, inode);
4069                 if (ret) {
4070                         mlog_errno(ret);
4071                         goto out;
4072                 }
4073         }
4074
4075         handle = ocfs2_start_trans(osb, blk_per_bucket);
4076         if (IS_ERR(handle)) {
4077                 ret = PTR_ERR(handle);
4078                 handle = NULL;
4079                 mlog_errno(ret);
4080                 goto out;
4081         }
4082
4083         for (i = 0; i < blk_per_bucket; i++) {
4084                 ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
4085                                            OCFS2_JOURNAL_ACCESS_WRITE);
4086                 if (ret < 0) {
4087                         mlog_errno(ret);
4088                         goto out;
4089                 }
4090         }
4091
4092         ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash,
4093                                      local, bucket_empty);
4094
4095         /*Only dirty the blocks we have touched in set xattr. */
4096         ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
4097                                                 xs->bucket.bhs, blk_per_bucket);
4098         if (ret)
4099                 mlog_errno(ret);
4100 out:
4101         ocfs2_commit_trans(osb, handle);
4102
4103         return ret;
4104 }
4105
4106 static int ocfs2_xattr_value_update_size(struct inode *inode,
4107                                          struct buffer_head *xe_bh,
4108                                          struct ocfs2_xattr_entry *xe,
4109                                          u64 new_size)
4110 {
4111         int ret;
4112         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4113         handle_t *handle = NULL;
4114
4115         handle = ocfs2_start_trans(osb, 1);
4116         if (handle == NULL) {
4117                 ret = -ENOMEM;
4118                 mlog_errno(ret);
4119                 goto out;
4120         }
4121
4122         ret = ocfs2_journal_access(handle, inode, xe_bh,
4123                                    OCFS2_JOURNAL_ACCESS_WRITE);
4124         if (ret < 0) {
4125                 mlog_errno(ret);
4126                 goto out_commit;
4127         }
4128
4129         xe->xe_value_size = cpu_to_le64(new_size);
4130
4131         ret = ocfs2_journal_dirty(handle, xe_bh);
4132         if (ret < 0)
4133                 mlog_errno(ret);
4134
4135 out_commit:
4136         ocfs2_commit_trans(osb, handle);
4137 out:
4138         return ret;
4139 }
4140
4141 /*
4142  * Truncate the specified xe_off entry in xattr bucket.
4143  * bucket is indicated by header_bh and len is the new length.
4144  * Both the ocfs2_xattr_value_root and the entry will be updated here.
4145  *
4146  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4147  */
4148 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4149                                              struct buffer_head *header_bh,
4150                                              int xe_off,
4151                                              int len)
4152 {
4153         int ret, offset;
4154         u64 value_blk;
4155         struct buffer_head *value_bh = NULL;
4156         struct ocfs2_xattr_value_root *xv;
4157         struct ocfs2_xattr_entry *xe;
4158         struct ocfs2_xattr_header *xh =
4159                         (struct ocfs2_xattr_header *)header_bh->b_data;
4160         size_t blocksize = inode->i_sb->s_blocksize;
4161
4162         xe = &xh->xh_entries[xe_off];
4163
4164         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4165
4166         offset = le16_to_cpu(xe->xe_name_offset) +
4167                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4168
4169         value_blk = offset / blocksize;
4170
4171         /* We don't allow ocfs2_xattr_value to be stored in different block. */
4172         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4173         value_blk += header_bh->b_blocknr;
4174
4175         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), value_blk,
4176                                &value_bh, OCFS2_BH_CACHED, inode);
4177         if (ret) {
4178                 mlog_errno(ret);
4179                 goto out;
4180         }
4181
4182         xv = (struct ocfs2_xattr_value_root *)
4183                 (value_bh->b_data + offset % blocksize);
4184
4185         mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4186              xe_off, (unsigned long long)header_bh->b_blocknr, len);
4187         ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
4188         if (ret) {
4189                 mlog_errno(ret);
4190                 goto out;
4191         }
4192
4193         ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
4194         if (ret) {
4195                 mlog_errno(ret);
4196                 goto out;
4197         }
4198
4199 out:
4200         brelse(value_bh);
4201         return ret;
4202 }
4203
4204 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4205                                                 struct ocfs2_xattr_search *xs,
4206                                                 int len)
4207 {
4208         int ret, offset;
4209         struct ocfs2_xattr_entry *xe = xs->here;
4210         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4211
4212         BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4213
4214         offset = xe - xh->xh_entries;
4215         ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
4216                                                 offset, len);
4217         if (ret)
4218                 mlog_errno(ret);
4219
4220         return ret;
4221 }
4222
4223 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4224                                                 struct ocfs2_xattr_search *xs,
4225                                                 char *val,
4226                                                 int value_len)
4227 {
4228         int offset;
4229         struct ocfs2_xattr_value_root *xv;
4230         struct ocfs2_xattr_entry *xe = xs->here;
4231
4232         BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4233
4234         offset = le16_to_cpu(xe->xe_name_offset) +
4235                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4236
4237         xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
4238
4239         return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
4240 }
4241
4242 /*
4243  * Remove the xattr bucket pointed by bucket_bh.
4244  * All the buckets after it in the same xattr extent rec will be
4245  * move forward one by one.
4246  */
4247 static int ocfs2_rm_xattr_bucket(struct inode *inode,
4248                                  struct buffer_head *first_bh,
4249                                  struct ocfs2_xattr_bucket *bucket)
4250 {
4251         int ret = 0, credits;
4252         struct ocfs2_xattr_header *xh =
4253                                 (struct ocfs2_xattr_header *)first_bh->b_data;
4254         u16 bucket_num = le16_to_cpu(xh->xh_num_buckets);
4255         u64 end, start = bucket->bhs[0]->b_blocknr;
4256         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4257         handle_t *handle;
4258         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4259
4260         end = first_bh->b_blocknr + (bucket_num - 1) * blk_per_bucket;
4261
4262         mlog(0, "rm xattr bucket %llu\n", start);
4263         /*
4264          * We need to update the first xattr_header and all the buckets starting
4265          * from start in this xattr rec.
4266          *
4267          * XXX: Should we empty the old last bucket here?
4268          */
4269         credits = 1 + end - start;
4270         handle = ocfs2_start_trans(osb, credits);
4271         if (IS_ERR(handle)) {
4272                 ret = PTR_ERR(handle);
4273                 mlog_errno(ret);
4274                 return ret;
4275         }
4276
4277         ret = ocfs2_journal_access(handle, inode, first_bh,
4278                                    OCFS2_JOURNAL_ACCESS_WRITE);
4279         if (ret) {
4280                 mlog_errno(ret);
4281                 goto out_commit;
4282         }
4283
4284
4285         while (start < end) {
4286                 ret = ocfs2_cp_xattr_bucket(inode, handle,
4287                                             start + blk_per_bucket,
4288                                             start, 0);
4289                 if (ret) {
4290                         mlog_errno(ret);
4291                         goto out_commit;
4292                 }
4293                 start += blk_per_bucket;
4294         }
4295
4296         /* update the first_bh. */
4297         xh->xh_num_buckets = cpu_to_le16(bucket_num - 1);
4298         ocfs2_journal_dirty(handle, first_bh);
4299
4300 out_commit:
4301         ocfs2_commit_trans(osb, handle);
4302         return ret;
4303 }
4304
4305 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4306                                   struct buffer_head *root_bh,
4307                                   u64 blkno,
4308                                   u32 cpos,
4309                                   u32 len)
4310 {
4311         int ret;
4312         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4313         struct inode *tl_inode = osb->osb_tl_inode;
4314         handle_t *handle;
4315         struct ocfs2_xattr_block *xb =
4316                         (struct ocfs2_xattr_block *)root_bh->b_data;
4317         struct ocfs2_extent_list *root_el = &xb->xb_attrs.xb_root.xt_list;
4318         struct ocfs2_alloc_context *meta_ac = NULL;
4319         struct ocfs2_cached_dealloc_ctxt dealloc;
4320
4321         ocfs2_init_dealloc_ctxt(&dealloc);
4322
4323         mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4324              cpos, len, (unsigned long long)blkno);
4325
4326         ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4327
4328         ret = ocfs2_lock_allocators(inode, root_bh, root_el,
4329                                     0, 1, NULL, &meta_ac,
4330                                     OCFS2_XATTR_TREE_EXTENT, NULL);
4331         if (ret) {
4332                 mlog_errno(ret);
4333                 return ret;
4334         }
4335
4336         mutex_lock(&tl_inode->i_mutex);
4337
4338         if (ocfs2_truncate_log_needs_flush(osb)) {
4339                 ret = __ocfs2_flush_truncate_log(osb);
4340                 if (ret < 0) {
4341                         mlog_errno(ret);
4342                         goto out;
4343                 }
4344         }
4345
4346         handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
4347         if (handle == NULL) {
4348                 ret = -ENOMEM;
4349                 mlog_errno(ret);
4350                 goto out;
4351         }
4352
4353         ret = ocfs2_journal_access(handle, inode, root_bh,
4354                                    OCFS2_JOURNAL_ACCESS_WRITE);
4355         if (ret) {
4356                 mlog_errno(ret);
4357                 goto out_commit;
4358         }
4359
4360         ret = ocfs2_remove_extent(inode, root_bh, cpos, len, handle, meta_ac,
4361                                   &dealloc, OCFS2_XATTR_TREE_EXTENT, NULL);
4362         if (ret) {
4363                 mlog_errno(ret);
4364                 goto out_commit;
4365         }
4366
4367         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4368
4369         ret = ocfs2_journal_dirty(handle, root_bh);
4370         if (ret) {
4371                 mlog_errno(ret);
4372                 goto out_commit;
4373         }
4374
4375         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4376         if (ret)
4377                 mlog_errno(ret);
4378
4379 out_commit:
4380         ocfs2_commit_trans(osb, handle);
4381 out:
4382         ocfs2_schedule_truncate_log_flush(osb, 1);
4383
4384         mutex_unlock(&tl_inode->i_mutex);
4385
4386         if (meta_ac)
4387                 ocfs2_free_alloc_context(meta_ac);
4388
4389         ocfs2_run_deallocs(osb, &dealloc);
4390
4391         return ret;
4392 }
4393
4394 /*
4395  * Free the xattr bucket indicated by xs->bucket and if all the buckets
4396  * in the clusters is free, free the clusters also.
4397  */
4398 static int ocfs2_xattr_bucket_shrink(struct inode *inode,
4399                                      struct ocfs2_xattr_info *xi,
4400                                      struct ocfs2_xattr_search *xs,
4401                                      u32 name_hash)
4402 {
4403         int ret;
4404         u32 e_cpos, num_clusters;
4405         u64 p_blkno;
4406         struct buffer_head *first_bh = NULL;
4407         struct ocfs2_xattr_header *first_xh;
4408         struct ocfs2_xattr_block *xb =
4409                         (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
4410
4411         BUG_ON(xs->header->xh_count != 0);
4412
4413         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4414                                   &e_cpos, &num_clusters,
4415                                   &xb->xb_attrs.xb_root.xt_list);
4416         if (ret) {
4417                 mlog_errno(ret);
4418                 return ret;
4419         }
4420
4421         ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno,
4422                                &first_bh, OCFS2_BH_CACHED, inode);
4423         if (ret) {
4424                 mlog_errno(ret);
4425                 return ret;
4426         }
4427
4428         ret = ocfs2_rm_xattr_bucket(inode, first_bh, &xs->bucket);
4429         if (ret) {
4430                 mlog_errno(ret);
4431                 goto out;
4432         }
4433
4434         first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
4435         if (first_xh->xh_num_buckets == 0)
4436                 ret = ocfs2_rm_xattr_cluster(inode, xs->xattr_bh,
4437                                              p_blkno, e_cpos,
4438                                              num_clusters);
4439
4440 out:
4441         brelse(first_bh);
4442         return ret;
4443 }
4444
4445 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4446                                          struct ocfs2_xattr_search *xs)
4447 {
4448         handle_t *handle = NULL;
4449         struct ocfs2_xattr_header *xh = xs->bucket.xh;
4450         struct ocfs2_xattr_entry *last = &xh->xh_entries[
4451                                                 le16_to_cpu(xh->xh_count) - 1];
4452         int ret = 0;
4453
4454         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
4455         if (IS_ERR(handle)) {
4456                 ret = PTR_ERR(handle);
4457                 mlog_errno(ret);
4458                 return;
4459         }
4460
4461         ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
4462                                    OCFS2_JOURNAL_ACCESS_WRITE);
4463         if (ret) {
4464                 mlog_errno(ret);
4465                 goto out_commit;
4466         }
4467
4468         /* Remove the old entry. */
4469         memmove(xs->here, xs->here + 1,
4470                 (void *)last - (void *)xs->here);
4471         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4472         le16_add_cpu(&xh->xh_count, -1);
4473
4474         ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
4475         if (ret < 0)
4476                 mlog_errno(ret);
4477 out_commit:
4478         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
4479 }
4480
4481 /*
4482  * Set the xattr name/value in the bucket specified in xs.
4483  *
4484  * As the new value in xi may be stored in the bucket or in an outside cluster,
4485  * we divide the whole process into 3 steps:
4486  * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4487  * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4488  * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4489  * 4. If the clusters for the new outside value can't be allocated, we need
4490  *    to free the xattr we allocated in set.
4491  */
4492 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4493                                      struct ocfs2_xattr_info *xi,
4494                                      struct ocfs2_xattr_search *xs)
4495 {
4496         int ret, local = 1, bucket_empty = 0;
4497         size_t value_len;
4498         char *val = (char *)xi->value;
4499         struct ocfs2_xattr_entry *xe = xs->here;
4500         u32 name_hash = ocfs2_xattr_hash_by_name(inode,
4501                                                  xi->name_index, xi->name);
4502
4503         if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4504                 /*
4505                  * We need to truncate the xattr storage first.
4506                  *
4507                  * If both the old and new value are stored to
4508                  * outside block, we only need to truncate
4509                  * the storage and then set the value outside.
4510                  *
4511                  * If the new value should be stored within block,
4512                  * we should free all the outside block first and
4513                  * the modification to the xattr block will be done
4514                  * by following steps.
4515                  */
4516                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4517                         value_len = xi->value_len;
4518                 else
4519                         value_len = 0;
4520
4521                 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4522                                                            value_len);
4523                 if (ret)
4524                         goto out;
4525
4526                 if (value_len)
4527                         goto set_value_outside;
4528         }
4529
4530         value_len = xi->value_len;
4531         /* So we have to handle the inside block change now. */
4532         if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4533                 /*
4534                  * If the new value will be stored outside of block,
4535                  * initalize a new empty value root and insert it first.
4536                  */
4537                 local = 0;
4538                 xi->value = &def_xv;
4539                 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4540         }
4541
4542         ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash,
4543                                               local, &bucket_empty);
4544         if (ret) {
4545                 mlog_errno(ret);
4546                 goto out;
4547         }
4548
4549         if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4550                 /* allocate the space now for the outside block storage. */
4551                 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4552                                                            value_len);
4553                 if (ret) {
4554                         mlog_errno(ret);
4555
4556                         if (xs->not_found) {
4557                                 /*
4558                                  * We can't allocate enough clusters for outside
4559                                  * storage and we have allocated xattr already,
4560                                  * so need to remove it.
4561                                  */
4562                                 ocfs2_xattr_bucket_remove_xs(inode, xs);
4563                         }
4564                         goto out;
4565                 }
4566         } else {
4567                 if (bucket_empty)
4568                         ret = ocfs2_xattr_bucket_shrink(inode, xi,
4569                                                         xs, name_hash);
4570                 goto out;
4571         }
4572
4573 set_value_outside:
4574         ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
4575 out:
4576         return ret;
4577 }
4578
4579 /* check whether the xattr bucket is filled up with the same hash value. */
4580 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
4581                                               struct ocfs2_xattr_bucket *bucket)
4582 {
4583         struct ocfs2_xattr_header *xh = bucket->xh;
4584
4585         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
4586             xh->xh_entries[0].xe_name_hash) {
4587                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
4588                      "hash = %u\n",
4589                      (unsigned long long)bucket->bhs[0]->b_blocknr,
4590                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
4591                 return -ENOSPC;
4592         }
4593
4594         return 0;
4595 }
4596
4597 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
4598                                              struct ocfs2_xattr_info *xi,
4599                                              struct ocfs2_xattr_search *xs)
4600 {
4601         struct ocfs2_xattr_header *xh;
4602         struct ocfs2_xattr_entry *xe;
4603         u16 count, header_size, xh_free_start;
4604         int i, free, max_free, need, old;
4605         size_t value_size = 0, name_len = strlen(xi->name);
4606         size_t blocksize = inode->i_sb->s_blocksize;
4607         int ret, allocation = 0;
4608         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4609
4610         mlog_entry("Set xattr %s in xattr index block\n", xi->name);
4611
4612 try_again:
4613         xh = xs->header;
4614         count = le16_to_cpu(xh->xh_count);
4615         xh_free_start = le16_to_cpu(xh->xh_free_start);
4616         header_size = sizeof(struct ocfs2_xattr_header) +
4617                         count * sizeof(struct ocfs2_xattr_entry);
4618         max_free = OCFS2_XATTR_BUCKET_SIZE -
4619                 le16_to_cpu(xh->xh_name_value_len) - header_size;
4620
4621         mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
4622                         "of %u which exceed block size\n",
4623                         (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4624                         header_size);
4625
4626         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4627                 value_size = OCFS2_XATTR_ROOT_SIZE;
4628         else if (xi->value)
4629                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
4630
4631         if (xs->not_found)
4632                 need = sizeof(struct ocfs2_xattr_entry) +
4633                         OCFS2_XATTR_SIZE(name_len) + value_size;
4634         else {
4635                 need = value_size + OCFS2_XATTR_SIZE(name_len);
4636
4637                 /*
4638                  * We only replace the old value if the new length is smaller
4639                  * than the old one. Otherwise we will allocate new space in the
4640                  * bucket to store it.
4641                  */
4642                 xe = xs->here;
4643                 if (ocfs2_xattr_is_local(xe))
4644                         old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4645                 else
4646                         old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4647
4648                 if (old >= value_size)
4649                         need = 0;
4650         }
4651
4652         free = xh_free_start - header_size;
4653         /*
4654          * We need to make sure the new name/value pair
4655          * can exist in the same block.
4656          */
4657         if (xh_free_start % blocksize < need)
4658                 free -= xh_free_start % blocksize;
4659
4660         mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
4661              "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
4662              " %u\n", xs->not_found,
4663              (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
4664              free, need, max_free, le16_to_cpu(xh->xh_free_start),
4665              le16_to_cpu(xh->xh_name_value_len));
4666
4667         if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4668                 if (need <= max_free &&
4669                     count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
4670                         /*
4671                          * We can create the space by defragment. Since only the
4672                          * name/value will be moved, the xe shouldn't be changed
4673                          * in xs.
4674                          */
4675                         ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
4676                         if (ret) {
4677                                 mlog_errno(ret);
4678                                 goto out;
4679                         }
4680
4681                         xh_free_start = le16_to_cpu(xh->xh_free_start);
4682                         free = xh_free_start - header_size;
4683                         if (xh_free_start % blocksize < need)
4684                                 free -= xh_free_start % blocksize;
4685
4686                         if (free >= need)
4687                                 goto xattr_set;
4688
4689                         mlog(0, "Can't get enough space for xattr insert by "
4690                              "defragment. Need %u bytes, but we have %d, so "
4691                              "allocate new bucket for it.\n", need, free);
4692                 }
4693
4694                 /*
4695                  * We have to add new buckets or clusters and one
4696                  * allocation should leave us enough space for insert.
4697                  */
4698                 BUG_ON(allocation);
4699
4700                 /*
4701                  * We do not allow for overlapping ranges between buckets. And
4702                  * the maximum number of collisions we will allow for then is
4703                  * one bucket's worth, so check it here whether we need to
4704                  * add a new bucket for the insert.
4705                  */
4706                 ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
4707                 if (ret) {
4708                         mlog_errno(ret);
4709                         goto out;
4710                 }
4711
4712                 ret = ocfs2_add_new_xattr_bucket(inode,
4713                                                  xs->xattr_bh,
4714                                                  xs->bucket.bhs[0]);
4715                 if (ret) {
4716                         mlog_errno(ret);
4717                         goto out;
4718                 }
4719
4720                 for (i = 0; i < blk_per_bucket; i++)
4721                         brelse(xs->bucket.bhs[i]);
4722
4723                 memset(&xs->bucket, 0, sizeof(xs->bucket));
4724
4725                 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
4726                                                    xi->name_index,
4727                                                    xi->name, xs);
4728                 if (ret && ret != -ENODATA)
4729                         goto out;
4730                 xs->not_found = ret;
4731                 allocation = 1;
4732                 goto try_again;
4733         }
4734
4735 xattr_set:
4736         ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
4737 out:
4738         mlog_exit(ret);
4739         return ret;
4740 }