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   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * xattr.c
   5  *
   6  * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
   7  *
   8  * CREDITS:
   9  * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
  10  * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public
  14  * License version 2 as published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  */
  21
  22 #include <linux/capability.h>
  23 #include <linux/fs.h>
  24 #include <linux/types.h>
  25 #include <linux/slab.h>
  26 #include <linux/highmem.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/uio.h>
  29 #include <linux/sched.h>
  30 #include <linux/splice.h>
  31 #include <linux/mount.h>
  32 #include <linux/writeback.h>
  33 #include <linux/falloc.h>
  34 #include <linux/sort.h>
  35 #include <linux/init.h>
  36 #include <linux/module.h>
  37 #include <linux/string.h>
  38 #include <linux/security.h>
  39
  40 #define MLOG_MASK_PREFIX ML_XATTR
  41 #include <cluster/masklog.h>
  42
  43 #include "ocfs2.h"
  44 #include "alloc.h"
  45 #include "blockcheck.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 #include "refcounttree.h"
  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         /* The inode these xattrs are associated with */
  67         struct inode *bu_inode;
  68
  69         /* The actual buffers that make up the bucket */
  70         struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
  71
  72         /* How many blocks make up one bucket for this filesystem */
  73         int bu_blocks;
  74 };
  75
  76 struct ocfs2_xattr_set_ctxt {
  77         handle_t *handle;
  78         struct ocfs2_alloc_context *meta_ac;
  79         struct ocfs2_alloc_context *data_ac;
  80         struct ocfs2_cached_dealloc_ctxt dealloc;
  81 };
  82
  83 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
  84 #define OCFS2_XATTR_INLINE_SIZE 80
  85 #define OCFS2_XATTR_HEADER_GAP  4
  86 #define OCFS2_XATTR_FREE_IN_IBODY       (OCFS2_MIN_XATTR_INLINE_SIZE \
  87                                          - sizeof(struct ocfs2_xattr_header) \
  88                                          - OCFS2_XATTR_HEADER_GAP)
  89 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr)  ((ptr)->i_sb->s_blocksize \
  90                                          - sizeof(struct ocfs2_xattr_block) \
  91                                          - sizeof(struct ocfs2_xattr_header) \
  92                                          - OCFS2_XATTR_HEADER_GAP)
  93
  94 static struct ocfs2_xattr_def_value_root def_xv = {
  95         .xv.xr_list.l_count = cpu_to_le16(1),
  96 };
  97
  98 struct xattr_handler *ocfs2_xattr_handlers[] = {
  99         &ocfs2_xattr_user_handler,
 100 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
 101         &ocfs2_xattr_acl_access_handler,
 102         &ocfs2_xattr_acl_default_handler,
 103 #endif
 104         &ocfs2_xattr_trusted_handler,
 105         &ocfs2_xattr_security_handler,
 106         NULL
 107 };
 108
 109 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
 110         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
 111 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
 112         [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
 113                                         = &ocfs2_xattr_acl_access_handler,
 114         [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
 115                                         = &ocfs2_xattr_acl_default_handler,
 116 #endif
 117         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
 118         [OCFS2_XATTR_INDEX_SECURITY]    = &ocfs2_xattr_security_handler,
 119 };
 120
 121 struct ocfs2_xattr_info {
 122         int name_index;
 123         const char *name;
 124         const void *value;
 125         size_t value_len;
 126 };
 127
 128 struct ocfs2_xattr_search {
 129         struct buffer_head *inode_bh;
 130         /*
 131          * xattr_bh point to the block buffer head which has extended attribute
 132          * when extended attribute in inode, xattr_bh is equal to inode_bh.
 133          */
 134         struct buffer_head *xattr_bh;
 135         struct ocfs2_xattr_header *header;
 136         struct ocfs2_xattr_bucket *bucket;
 137         void *base;
 138         void *end;
 139         struct ocfs2_xattr_entry *here;
 140         int not_found;
 141 };
 142
 143 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
 144                                              struct ocfs2_xattr_header *xh,
 145                                              int index,
 146                                              int *block_off,
 147                                              int *new_offset);
 148
 149 static int ocfs2_xattr_block_find(struct inode *inode,
 150                                   int name_index,
 151                                   const char *name,
 152                                   struct ocfs2_xattr_search *xs);
 153 static int ocfs2_xattr_index_block_find(struct inode *inode,
 154                                         struct buffer_head *root_bh,
 155                                         int name_index,
 156                                         const char *name,
 157                                         struct ocfs2_xattr_search *xs);
 158
 159 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
 160                                         struct ocfs2_xattr_tree_root *xt,
 161                                         char *buffer,
 162                                         size_t buffer_size);
 163
 164 static int ocfs2_xattr_create_index_block(struct inode *inode,
 165                                           struct ocfs2_xattr_search *xs,
 166                                           struct ocfs2_xattr_set_ctxt *ctxt);
 167
 168 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
 169                                              struct ocfs2_xattr_info *xi,
 170                                              struct ocfs2_xattr_search *xs,
 171                                              struct ocfs2_xattr_set_ctxt *ctxt);
 172
 173 static int ocfs2_delete_xattr_index_block(struct inode *inode,
 174                                           struct buffer_head *xb_bh);
 175 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
 176                                   u64 src_blk, u64 last_blk, u64 to_blk,
 177                                   unsigned int start_bucket,
 178                                   u32 *first_hash);
 179 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
 180                                         struct ocfs2_dinode *di,
 181                                         struct ocfs2_xattr_info *xi,
 182                                         struct ocfs2_xattr_search *xis,
 183                                         struct ocfs2_xattr_search *xbs,
 184                                         struct ocfs2_refcount_tree **ref_tree,
 185                                         int *meta_need,
 186                                         int *credits);
 187
 188 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
 189 {
 190         return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
 191 }
 192
 193 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
 194 {
 195         return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
 196 }
 197
 198 static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
 199 {
 200         u16 len = sb->s_blocksize -
 201                  offsetof(struct ocfs2_xattr_header, xh_entries);
 202
 203         return len / sizeof(struct ocfs2_xattr_entry);
 204 }
 205
 206 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
 207 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
 208 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
 209
 210 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
 211 {
 212         struct ocfs2_xattr_bucket *bucket;
 213         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
 214
 215         BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
 216
 217         bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
 218         if (bucket) {
 219                 bucket->bu_inode = inode;
 220                 bucket->bu_blocks = blks;
 221         }
 222
 223         return bucket;
 224 }
 225
 226 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
 227 {
 228         int i;
 229
 230         for (i = 0; i < bucket->bu_blocks; i++) {
 231                 brelse(bucket->bu_bhs[i]);
 232                 bucket->bu_bhs[i] = NULL;
 233         }
 234 }
 235
 236 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
 237 {
 238         if (bucket) {
 239                 ocfs2_xattr_bucket_relse(bucket);
 240                 bucket->bu_inode = NULL;
 241                 kfree(bucket);
 242         }
 243 }
 244
 245 /*
 246  * A bucket that has never been written to disk doesn't need to be
 247  * read.  We just need the buffer_heads.  Don't call this for
 248  * buckets that are already on disk.  ocfs2_read_xattr_bucket() initializes
 249  * them fully.
 250  */
 251 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 252                                    u64 xb_blkno)
 253 {
 254         int i, rc = 0;
 255
 256         for (i = 0; i < bucket->bu_blocks; i++) {
 257                 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
 258                                               xb_blkno + i);
 259                 if (!bucket->bu_bhs[i]) {
 260                         rc = -EIO;
 261                         mlog_errno(rc);
 262                         break;
 263                 }
 264
 265                 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 266                                            bucket->bu_bhs[i]))
 267                         ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 268                                                       bucket->bu_bhs[i]);
 269         }
 270
 271         if (rc)
 272                 ocfs2_xattr_bucket_relse(bucket);
 273         return rc;
 274 }
 275
 276 /* Read the xattr bucket at xb_blkno */
 277 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 278                                    u64 xb_blkno)
 279 {
 280         int rc;
 281
 282         rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
 283                                bucket->bu_blocks, bucket->bu_bhs, 0,
 284                                NULL);
 285         if (!rc) {
 286                 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 287                 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
 288                                                  bucket->bu_bhs,
 289                                                  bucket->bu_blocks,
 290                                                  &bucket_xh(bucket)->xh_check);
 291                 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 292                 if (rc)
 293                         mlog_errno(rc);
 294         }
 295
 296         if (rc)
 297                 ocfs2_xattr_bucket_relse(bucket);
 298         return rc;
 299 }
 300
 301 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
 302                                              struct ocfs2_xattr_bucket *bucket,
 303                                              int type)
 304 {
 305         int i, rc = 0;
 306
 307         for (i = 0; i < bucket->bu_blocks; i++) {
 308                 rc = ocfs2_journal_access(handle,
 309                                           INODE_CACHE(bucket->bu_inode),
 310                                           bucket->bu_bhs[i], type);
 311                 if (rc) {
 312                         mlog_errno(rc);
 313                         break;
 314                 }
 315         }
 316
 317         return rc;
 318 }
 319
 320 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
 321                                              struct ocfs2_xattr_bucket *bucket)
 322 {
 323         int i;
 324
 325         spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 326         ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
 327                                    bucket->bu_bhs, bucket->bu_blocks,
 328                                    &bucket_xh(bucket)->xh_check);
 329         spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 330
 331         for (i = 0; i < bucket->bu_blocks; i++)
 332                 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
 333 }
 334
 335 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
 336                                          struct ocfs2_xattr_bucket *src)
 337 {
 338         int i;
 339         int blocksize = src->bu_inode->i_sb->s_blocksize;
 340
 341         BUG_ON(dest->bu_blocks != src->bu_blocks);
 342         BUG_ON(dest->bu_inode != src->bu_inode);
 343
 344         for (i = 0; i < src->bu_blocks; i++) {
 345                 memcpy(bucket_block(dest, i), bucket_block(src, i),
 346                        blocksize);
 347         }
 348 }
 349
 350 static int ocfs2_validate_xattr_block(struct super_block *sb,
 351                                       struct buffer_head *bh)
 352 {
 353         int rc;
 354         struct ocfs2_xattr_block *xb =
 355                 (struct ocfs2_xattr_block *)bh->b_data;
 356
 357         mlog(0, "Validating xattr block %llu\n",
 358              (unsigned long long)bh->b_blocknr);
 359
 360         BUG_ON(!buffer_uptodate(bh));
 361
 362         /*
 363          * If the ecc fails, we return the error but otherwise
 364          * leave the filesystem running.  We know any error is
 365          * local to this block.
 366          */
 367         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
 368         if (rc)
 369                 return rc;
 370
 371         /*
 372          * Errors after here are fatal
 373          */
 374
 375         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
 376                 ocfs2_error(sb,
 377                             "Extended attribute block #%llu has bad "
 378                             "signature %.*s",
 379                             (unsigned long long)bh->b_blocknr, 7,
 380                             xb->xb_signature);
 381                 return -EINVAL;
 382         }
 383
 384         if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
 385                 ocfs2_error(sb,
 386                             "Extended attribute block #%llu has an "
 387                             "invalid xb_blkno of %llu",
 388                             (unsigned long long)bh->b_blocknr,
 389                             (unsigned long long)le64_to_cpu(xb->xb_blkno));
 390                 return -EINVAL;
 391         }
 392
 393         if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
 394                 ocfs2_error(sb,
 395                             "Extended attribute block #%llu has an invalid "
 396                             "xb_fs_generation of #%u",
 397                             (unsigned long long)bh->b_blocknr,
 398                             le32_to_cpu(xb->xb_fs_generation));
 399                 return -EINVAL;
 400         }
 401
 402         return 0;
 403 }
 404
 405 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
 406                                   struct buffer_head **bh)
 407 {
 408         int rc;
 409         struct buffer_head *tmp = *bh;
 410
 411         rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
 412                               ocfs2_validate_xattr_block);
 413
 414         /* If ocfs2_read_block() got us a new bh, pass it up. */
 415         if (!rc && !*bh)
 416                 *bh = tmp;
 417
 418         return rc;
 419 }
 420
 421 static inline const char *ocfs2_xattr_prefix(int name_index)
 422 {
 423         struct xattr_handler *handler = NULL;
 424
 425         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
 426                 handler = ocfs2_xattr_handler_map[name_index];
 427
 428         return handler ? handler->prefix : NULL;
 429 }
 430
 431 static u32 ocfs2_xattr_name_hash(struct inode *inode,
 432                                  const char *name,
 433                                  int name_len)
 434 {
 435         /* Get hash value of uuid from super block */
 436         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
 437         int i;
 438
 439         /* hash extended attribute name */
 440         for (i = 0; i < name_len; i++) {
 441                 hash = (hash << OCFS2_HASH_SHIFT) ^
 442                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 443                        *name++;
 444         }
 445
 446         return hash;
 447 }
 448
 449 /*
 450  * ocfs2_xattr_hash_entry()
 451  *
 452  * Compute the hash of an extended attribute.
 453  */
 454 static void ocfs2_xattr_hash_entry(struct inode *inode,
 455                                    struct ocfs2_xattr_header *header,
 456                                    struct ocfs2_xattr_entry *entry)
 457 {
 458         u32 hash = 0;
 459         char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
 460
 461         hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
 462         entry->xe_name_hash = cpu_to_le32(hash);
 463
 464         return;
 465 }
 466
 467 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
 468 {
 469         int size = 0;
 470
 471         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
 472                 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
 473         else
 474                 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 475         size += sizeof(struct ocfs2_xattr_entry);
 476
 477         return size;
 478 }
 479
 480 int ocfs2_calc_security_init(struct inode *dir,
 481                              struct ocfs2_security_xattr_info *si,
 482                              int *want_clusters,
 483                              int *xattr_credits,
 484                              struct ocfs2_alloc_context **xattr_ac)
 485 {
 486         int ret = 0;
 487         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 488         int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 489                                                  si->value_len);
 490
 491         /*
 492          * The max space of security xattr taken inline is
 493          * 256(name) + 80(value) + 16(entry) = 352 bytes,
 494          * So reserve one metadata block for it is ok.
 495          */
 496         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 497             s_size > OCFS2_XATTR_FREE_IN_IBODY) {
 498                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
 499                 if (ret) {
 500                         mlog_errno(ret);
 501                         return ret;
 502                 }
 503                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 504         }
 505
 506         /* reserve clusters for xattr value which will be set in B tree*/
 507         if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
 508                 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
 509                                                             si->value_len);
 510
 511                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 512                                                            new_clusters);
 513                 *want_clusters += new_clusters;
 514         }
 515         return ret;
 516 }
 517
 518 int ocfs2_calc_xattr_init(struct inode *dir,
 519                           struct buffer_head *dir_bh,
 520                           int mode,
 521                           struct ocfs2_security_xattr_info *si,
 522                           int *want_clusters,
 523                           int *xattr_credits,
 524                           int *want_meta)
 525 {
 526         int ret = 0;
 527         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 528         int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
 529
 530         if (si->enable)
 531                 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 532                                                      si->value_len);
 533
 534         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
 535                 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
 536                                         OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
 537                                         "", NULL, 0);
 538                 if (acl_len > 0) {
 539                         a_size = ocfs2_xattr_entry_real_size(0, acl_len);
 540                         if (S_ISDIR(mode))
 541                                 a_size <<= 1;
 542                 } else if (acl_len != 0 && acl_len != -ENODATA) {
 543                         mlog_errno(ret);
 544                         return ret;
 545                 }
 546         }
 547
 548         if (!(s_size + a_size))
 549                 return ret;
 550
 551         /*
 552          * The max space of security xattr taken inline is
 553          * 256(name) + 80(value) + 16(entry) = 352 bytes,
 554          * The max space of acl xattr taken inline is
 555          * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
 556          * when blocksize = 512, may reserve one more cluser for
 557          * xattr bucket, otherwise reserve one metadata block
 558          * for them is ok.
 559          * If this is a new directory with inline data,
 560          * we choose to reserve the entire inline area for
 561          * directory contents and force an external xattr block.
 562          */
 563         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 564             (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
 565             (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
 566                 *want_meta = *want_meta + 1;
 567                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 568         }
 569
 570         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
 571             (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
 572                 *want_clusters += 1;
 573                 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
 574         }
 575
 576         /*
 577          * reserve credits and clusters for xattrs which has large value
 578          * and have to be set outside
 579          */
 580         if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
 581                 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
 582                                                         si->value_len);
 583                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 584                                                            new_clusters);
 585                 *want_clusters += new_clusters;
 586         }
 587         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
 588             acl_len > OCFS2_XATTR_INLINE_SIZE) {
 589                 /* for directory, it has DEFAULT and ACCESS two types of acls */
 590                 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
 591                                 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
 592                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 593                                                            new_clusters);
 594                 *want_clusters += new_clusters;
 595         }
 596
 597         return ret;
 598 }
 599
 600 static int ocfs2_xattr_extend_allocation(struct inode *inode,
 601                                          u32 clusters_to_add,
 602                                          struct ocfs2_xattr_value_buf *vb,
 603                                          struct ocfs2_xattr_set_ctxt *ctxt)
 604 {
 605         int status = 0;
 606         handle_t *handle = ctxt->handle;
 607         enum ocfs2_alloc_restarted why;
 608         u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
 609         struct ocfs2_extent_tree et;
 610
 611         mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
 612
 613         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 614
 615         status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
 616                               OCFS2_JOURNAL_ACCESS_WRITE);
 617         if (status < 0) {
 618                 mlog_errno(status);
 619                 goto leave;
 620         }
 621
 622         prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
 623         status = ocfs2_add_clusters_in_btree(handle,
 624                                              &et,
 625                                              &logical_start,
 626                                              clusters_to_add,
 627                                              0,
 628                                              ctxt->data_ac,
 629                                              ctxt->meta_ac,
 630                                              &why);
 631         if (status < 0) {
 632                 mlog_errno(status);
 633                 goto leave;
 634         }
 635
 636         status = ocfs2_journal_dirty(handle, vb->vb_bh);
 637         if (status < 0) {
 638                 mlog_errno(status);
 639                 goto leave;
 640         }
 641
 642         clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) - prev_clusters;
 643
 644         /*
 645          * We should have already allocated enough space before the transaction,
 646          * so no need to restart.
 647          */
 648         BUG_ON(why != RESTART_NONE || clusters_to_add);
 649
 650 leave:
 651
 652         return status;
 653 }
 654
 655 static int __ocfs2_remove_xattr_range(struct inode *inode,
 656                                       struct ocfs2_xattr_value_buf *vb,
 657                                       u32 cpos, u32 phys_cpos, u32 len,
 658                                       unsigned int ext_flags,
 659                                       struct ocfs2_xattr_set_ctxt *ctxt)
 660 {
 661         int ret;
 662         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 663         handle_t *handle = ctxt->handle;
 664         struct ocfs2_extent_tree et;
 665
 666         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 667
 668         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
 669                             OCFS2_JOURNAL_ACCESS_WRITE);
 670         if (ret) {
 671                 mlog_errno(ret);
 672                 goto out;
 673         }
 674
 675         ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
 676                                   &ctxt->dealloc);
 677         if (ret) {
 678                 mlog_errno(ret);
 679                 goto out;
 680         }
 681
 682         le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
 683
 684         ret = ocfs2_journal_dirty(handle, vb->vb_bh);
 685         if (ret) {
 686                 mlog_errno(ret);
 687                 goto out;
 688         }
 689
 690         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 691                 ret = ocfs2_decrease_refcount(inode, handle,
 692                                         ocfs2_blocks_to_clusters(inode->i_sb,
 693                                                                  phys_blkno),
 694                                         len, ctxt->meta_ac, &ctxt->dealloc, 1);
 695         else
 696                 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
 697                                                   phys_blkno, len);
 698         if (ret)
 699                 mlog_errno(ret);
 700
 701 out:
 702         return ret;
 703 }
 704
 705 static int ocfs2_xattr_shrink_size(struct inode *inode,
 706                                    u32 old_clusters,
 707                                    u32 new_clusters,
 708                                    struct ocfs2_xattr_value_buf *vb,
 709                                    struct ocfs2_xattr_set_ctxt *ctxt)
 710 {
 711         int ret = 0;
 712         unsigned int ext_flags;
 713         u32 trunc_len, cpos, phys_cpos, alloc_size;
 714         u64 block;
 715
 716         if (old_clusters <= new_clusters)
 717                 return 0;
 718
 719         cpos = new_clusters;
 720         trunc_len = old_clusters - new_clusters;
 721         while (trunc_len) {
 722                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
 723                                                &alloc_size,
 724                                                &vb->vb_xv->xr_list, &ext_flags);
 725                 if (ret) {
 726                         mlog_errno(ret);
 727                         goto out;
 728                 }
 729
 730                 if (alloc_size > trunc_len)
 731                         alloc_size = trunc_len;
 732
 733                 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
 734                                                  phys_cpos, alloc_size,
 735                                                  ext_flags, ctxt);
 736                 if (ret) {
 737                         mlog_errno(ret);
 738                         goto out;
 739                 }
 740
 741                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 742                 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
 743                                                        block, alloc_size);
 744                 cpos += alloc_size;
 745                 trunc_len -= alloc_size;
 746         }
 747
 748 out:
 749         return ret;
 750 }
 751
 752 static int ocfs2_xattr_value_truncate(struct inode *inode,
 753                                       struct ocfs2_xattr_value_buf *vb,
 754                                       int len,
 755                                       struct ocfs2_xattr_set_ctxt *ctxt)
 756 {
 757         int ret;
 758         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
 759         u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
 760
 761         if (new_clusters == old_clusters)
 762                 return 0;
 763
 764         if (new_clusters > old_clusters)
 765                 ret = ocfs2_xattr_extend_allocation(inode,
 766                                                     new_clusters - old_clusters,
 767                                                     vb, ctxt);
 768         else
 769                 ret = ocfs2_xattr_shrink_size(inode,
 770                                               old_clusters, new_clusters,
 771                                               vb, ctxt);
 772
 773         return ret;
 774 }
 775
 776 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
 777                                   size_t *result, const char *prefix,
 778                                   const char *name, int name_len)
 779 {
 780         char *p = buffer + *result;
 781         int prefix_len = strlen(prefix);
 782         int total_len = prefix_len + name_len + 1;
 783
 784         *result += total_len;
 785
 786         /* we are just looking for how big our buffer needs to be */
 787         if (!size)
 788                 return 0;
 789
 790         if (*result > size)
 791                 return -ERANGE;
 792
 793         memcpy(p, prefix, prefix_len);
 794         memcpy(p + prefix_len, name, name_len);
 795         p[prefix_len + name_len] = '\0';
 796
 797         return 0;
 798 }
 799
 800 static int ocfs2_xattr_list_entries(struct inode *inode,
 801                                     struct ocfs2_xattr_header *header,
 802                                     char *buffer, size_t buffer_size)
 803 {
 804         size_t result = 0;
 805         int i, type, ret;
 806         const char *prefix, *name;
 807
 808         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
 809                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 810                 type = ocfs2_xattr_get_type(entry);
 811                 prefix = ocfs2_xattr_prefix(type);
 812
 813                 if (prefix) {
 814                         name = (const char *)header +
 815                                 le16_to_cpu(entry->xe_name_offset);
 816
 817                         ret = ocfs2_xattr_list_entry(buffer, buffer_size,
 818                                                      &result, prefix, name,
 819                                                      entry->xe_name_len);
 820                         if (ret)
 821                                 return ret;
 822                 }
 823         }
 824
 825         return result;
 826 }
 827
 828 static int ocfs2_xattr_ibody_list(struct inode *inode,
 829                                   struct ocfs2_dinode *di,
 830                                   char *buffer,
 831                                   size_t buffer_size)
 832 {
 833         struct ocfs2_xattr_header *header = NULL;
 834         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 835         int ret = 0;
 836
 837         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 838                 return ret;
 839
 840         header = (struct ocfs2_xattr_header *)
 841                  ((void *)di + inode->i_sb->s_blocksize -
 842                  le16_to_cpu(di->i_xattr_inline_size));
 843
 844         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
 845
 846         return ret;
 847 }
 848
 849 static int ocfs2_xattr_block_list(struct inode *inode,
 850                                   struct ocfs2_dinode *di,
 851                                   char *buffer,
 852                                   size_t buffer_size)
 853 {
 854         struct buffer_head *blk_bh = NULL;
 855         struct ocfs2_xattr_block *xb;
 856         int ret = 0;
 857
 858         if (!di->i_xattr_loc)
 859                 return ret;
 860
 861         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
 862                                      &blk_bh);
 863         if (ret < 0) {
 864                 mlog_errno(ret);
 865                 return ret;
 866         }
 867
 868         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 869         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 870                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
 871                 ret = ocfs2_xattr_list_entries(inode, header,
 872                                                buffer, buffer_size);
 873         } else {
 874                 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
 875                 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
 876                                                    buffer, buffer_size);
 877         }
 878
 879         brelse(blk_bh);
 880
 881         return ret;
 882 }
 883
 884 ssize_t ocfs2_listxattr(struct dentry *dentry,
 885                         char *buffer,
 886                         size_t size)
 887 {
 888         int ret = 0, i_ret = 0, b_ret = 0;
 889         struct buffer_head *di_bh = NULL;
 890         struct ocfs2_dinode *di = NULL;
 891         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
 892
 893         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
 894                 return -EOPNOTSUPP;
 895
 896         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 897                 return ret;
 898
 899         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
 900         if (ret < 0) {
 901                 mlog_errno(ret);
 902                 return ret;
 903         }
 904
 905         di = (struct ocfs2_dinode *)di_bh->b_data;
 906
 907         down_read(&oi->ip_xattr_sem);
 908         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
 909         if (i_ret < 0)
 910                 b_ret = 0;
 911         else {
 912                 if (buffer) {
 913                         buffer += i_ret;
 914                         size -= i_ret;
 915                 }
 916                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
 917                                                buffer, size);
 918                 if (b_ret < 0)
 919                         i_ret = 0;
 920         }
 921         up_read(&oi->ip_xattr_sem);
 922         ocfs2_inode_unlock(dentry->d_inode, 0);
 923
 924         brelse(di_bh);
 925
 926         return i_ret + b_ret;
 927 }
 928
 929 static int ocfs2_xattr_find_entry(int name_index,
 930                                   const char *name,
 931                                   struct ocfs2_xattr_search *xs)
 932 {
 933         struct ocfs2_xattr_entry *entry;
 934         size_t name_len;
 935         int i, cmp = 1;
 936
 937         if (name == NULL)
 938                 return -EINVAL;
 939
 940         name_len = strlen(name);
 941         entry = xs->here;
 942         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
 943                 cmp = name_index - ocfs2_xattr_get_type(entry);
 944                 if (!cmp)
 945                         cmp = name_len - entry->xe_name_len;
 946                 if (!cmp)
 947                         cmp = memcmp(name, (xs->base +
 948                                      le16_to_cpu(entry->xe_name_offset)),
 949                                      name_len);
 950                 if (cmp == 0)
 951                         break;
 952                 entry += 1;
 953         }
 954         xs->here = entry;
 955
 956         return cmp ? -ENODATA : 0;
 957 }
 958
 959 static int ocfs2_xattr_get_value_outside(struct inode *inode,
 960                                          struct ocfs2_xattr_value_root *xv,
 961                                          void *buffer,
 962                                          size_t len)
 963 {
 964         u32 cpos, p_cluster, num_clusters, bpc, clusters;
 965         u64 blkno;
 966         int i, ret = 0;
 967         size_t cplen, blocksize;
 968         struct buffer_head *bh = NULL;
 969         struct ocfs2_extent_list *el;
 970
 971         el = &xv->xr_list;
 972         clusters = le32_to_cpu(xv->xr_clusters);
 973         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 974         blocksize = inode->i_sb->s_blocksize;
 975
 976         cpos = 0;
 977         while (cpos < clusters) {
 978                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 979                                                &num_clusters, el, NULL);
 980                 if (ret) {
 981                         mlog_errno(ret);
 982                         goto out;
 983                 }
 984
 985                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 986                 /* Copy ocfs2_xattr_value */
 987                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
 988                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
 989                                                &bh, NULL);
 990                         if (ret) {
 991                                 mlog_errno(ret);
 992                                 goto out;
 993                         }
 994
 995                         cplen = len >= blocksize ? blocksize : len;
 996                         memcpy(buffer, bh->b_data, cplen);
 997                         len -= cplen;
 998                         buffer += cplen;
 999
1000                         brelse(bh);
1001                         bh = NULL;
1002                         if (len == 0)
1003                                 break;
1004                 }
1005                 cpos += num_clusters;
1006         }
1007 out:
1008         return ret;
1009 }
1010
1011 static int ocfs2_xattr_ibody_get(struct inode *inode,
1012                                  int name_index,
1013                                  const char *name,
1014                                  void *buffer,
1015                                  size_t buffer_size,
1016                                  struct ocfs2_xattr_search *xs)
1017 {
1018         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1019         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1020         struct ocfs2_xattr_value_root *xv;
1021         size_t size;
1022         int ret = 0;
1023
1024         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1025                 return -ENODATA;
1026
1027         xs->end = (void *)di + inode->i_sb->s_blocksize;
1028         xs->header = (struct ocfs2_xattr_header *)
1029                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1030         xs->base = (void *)xs->header;
1031         xs->here = xs->header->xh_entries;
1032
1033         ret = ocfs2_xattr_find_entry(name_index, name, xs);
1034         if (ret)
1035                 return ret;
1036         size = le64_to_cpu(xs->here->xe_value_size);
1037         if (buffer) {
1038                 if (size > buffer_size)
1039                         return -ERANGE;
1040                 if (ocfs2_xattr_is_local(xs->here)) {
1041                         memcpy(buffer, (void *)xs->base +
1042                                le16_to_cpu(xs->here->xe_name_offset) +
1043                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1044                 } else {
1045                         xv = (struct ocfs2_xattr_value_root *)
1046                                 (xs->base + le16_to_cpu(
1047                                  xs->here->xe_name_offset) +
1048                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1049                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1050                                                             buffer, size);
1051                         if (ret < 0) {
1052                                 mlog_errno(ret);
1053                                 return ret;
1054                         }
1055                 }
1056         }
1057
1058         return size;
1059 }
1060
1061 static int ocfs2_xattr_block_get(struct inode *inode,
1062                                  int name_index,
1063                                  const char *name,
1064                                  void *buffer,
1065                                  size_t buffer_size,
1066                                  struct ocfs2_xattr_search *xs)
1067 {
1068         struct ocfs2_xattr_block *xb;
1069         struct ocfs2_xattr_value_root *xv;
1070         size_t size;
1071         int ret = -ENODATA, name_offset, name_len, i;
1072         int uninitialized_var(block_off);
1073
1074         xs->bucket = ocfs2_xattr_bucket_new(inode);
1075         if (!xs->bucket) {
1076                 ret = -ENOMEM;
1077                 mlog_errno(ret);
1078                 goto cleanup;
1079         }
1080
1081         ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1082         if (ret) {
1083                 mlog_errno(ret);
1084                 goto cleanup;
1085         }
1086
1087         if (xs->not_found) {
1088                 ret = -ENODATA;
1089                 goto cleanup;
1090         }
1091
1092         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1093         size = le64_to_cpu(xs->here->xe_value_size);
1094         if (buffer) {
1095                 ret = -ERANGE;
1096                 if (size > buffer_size)
1097                         goto cleanup;
1098
1099                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1100                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1101                 i = xs->here - xs->header->xh_entries;
1102
1103                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1104                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1105                                                                 bucket_xh(xs->bucket),
1106                                                                 i,
1107                                                                 &block_off,
1108                                                                 &name_offset);
1109                         xs->base = bucket_block(xs->bucket, block_off);
1110                 }
1111                 if (ocfs2_xattr_is_local(xs->here)) {
1112                         memcpy(buffer, (void *)xs->base +
1113                                name_offset + name_len, size);
1114                 } else {
1115                         xv = (struct ocfs2_xattr_value_root *)
1116                                 (xs->base + name_offset + name_len);
1117                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1118                                                             buffer, size);
1119                         if (ret < 0) {
1120                                 mlog_errno(ret);
1121                                 goto cleanup;
1122                         }
1123                 }
1124         }
1125         ret = size;
1126 cleanup:
1127         ocfs2_xattr_bucket_free(xs->bucket);
1128
1129         brelse(xs->xattr_bh);
1130         xs->xattr_bh = NULL;
1131         return ret;
1132 }
1133
1134 int ocfs2_xattr_get_nolock(struct inode *inode,
1135                            struct buffer_head *di_bh,
1136                            int name_index,
1137                            const char *name,
1138                            void *buffer,
1139                            size_t buffer_size)
1140 {
1141         int ret;
1142         struct ocfs2_dinode *di = NULL;
1143         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1144         struct ocfs2_xattr_search xis = {
1145                 .not_found = -ENODATA,
1146         };
1147         struct ocfs2_xattr_search xbs = {
1148                 .not_found = -ENODATA,
1149         };
1150
1151         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1152                 return -EOPNOTSUPP;
1153
1154         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1155                 ret = -ENODATA;
1156
1157         xis.inode_bh = xbs.inode_bh = di_bh;
1158         di = (struct ocfs2_dinode *)di_bh->b_data;
1159
1160         down_read(&oi->ip_xattr_sem);
1161         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1162                                     buffer_size, &xis);
1163         if (ret == -ENODATA && di->i_xattr_loc)
1164                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1165                                             buffer_size, &xbs);
1166         up_read(&oi->ip_xattr_sem);
1167
1168         return ret;
1169 }
1170
1171 /* ocfs2_xattr_get()
1172  *
1173  * Copy an extended attribute into the buffer provided.
1174  * Buffer is NULL to compute the size of buffer required.
1175  */
1176 static int ocfs2_xattr_get(struct inode *inode,
1177                            int name_index,
1178                            const char *name,
1179                            void *buffer,
1180                            size_t buffer_size)
1181 {
1182         int ret;
1183         struct buffer_head *di_bh = NULL;
1184
1185         ret = ocfs2_inode_lock(inode, &di_bh, 0);
1186         if (ret < 0) {
1187                 mlog_errno(ret);
1188                 return ret;
1189         }
1190         ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1191                                      name, buffer, buffer_size);
1192
1193         ocfs2_inode_unlock(inode, 0);
1194
1195         brelse(di_bh);
1196
1197         return ret;
1198 }
1199
1200 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1201                                            handle_t *handle,
1202                                            struct ocfs2_xattr_value_buf *vb,
1203                                            const void *value,
1204                                            int value_len)
1205 {
1206         int ret = 0, i, cp_len;
1207         u16 blocksize = inode->i_sb->s_blocksize;
1208         u32 p_cluster, num_clusters;
1209         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1210         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1211         u64 blkno;
1212         struct buffer_head *bh = NULL;
1213         unsigned int ext_flags;
1214         struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1215
1216         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1217
1218         while (cpos < clusters) {
1219                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1220                                                &num_clusters, &xv->xr_list,
1221                                                &ext_flags);
1222                 if (ret) {
1223                         mlog_errno(ret);
1224                         goto out;
1225                 }
1226
1227                 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1228
1229                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1230
1231                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1232                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1233                                                &bh, NULL);
1234                         if (ret) {
1235                                 mlog_errno(ret);
1236                                 goto out;
1237                         }
1238
1239                         ret = ocfs2_journal_access(handle,
1240                                                    INODE_CACHE(inode),
1241                                                    bh,
1242                                                    OCFS2_JOURNAL_ACCESS_WRITE);
1243                         if (ret < 0) {
1244                                 mlog_errno(ret);
1245                                 goto out;
1246                         }
1247
1248                         cp_len = value_len > blocksize ? blocksize : value_len;
1249                         memcpy(bh->b_data, value, cp_len);
1250                         value_len -= cp_len;
1251                         value += cp_len;
1252                         if (cp_len < blocksize)
1253                                 memset(bh->b_data + cp_len, 0,
1254                                        blocksize - cp_len);
1255
1256                         ret = ocfs2_journal_dirty(handle, bh);
1257                         if (ret < 0) {
1258                                 mlog_errno(ret);
1259                                 goto out;
1260                         }
1261                         brelse(bh);
1262                         bh = NULL;
1263
1264                         /*
1265                          * XXX: do we need to empty all the following
1266                          * blocks in this cluster?
1267                          */
1268                         if (!value_len)
1269                                 break;
1270                 }
1271                 cpos += num_clusters;
1272         }
1273 out:
1274         brelse(bh);
1275
1276         return ret;
1277 }
1278
1279 static int ocfs2_xattr_cleanup(struct inode *inode,
1280                                handle_t *handle,
1281                                struct ocfs2_xattr_info *xi,
1282                                struct ocfs2_xattr_search *xs,
1283                                struct ocfs2_xattr_value_buf *vb,
1284                                size_t offs)
1285 {
1286         int ret = 0;
1287         size_t name_len = strlen(xi->name);
1288         void *val = xs->base + offs;
1289         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1290
1291         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
1292                             OCFS2_JOURNAL_ACCESS_WRITE);
1293         if (ret) {
1294                 mlog_errno(ret);
1295                 goto out;
1296         }
1297         /* Decrease xattr count */
1298         le16_add_cpu(&xs->header->xh_count, -1);
1299         /* Remove the xattr entry and tree root which has already be set*/
1300         memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
1301         memset(val, 0, size);
1302
1303         ret = ocfs2_journal_dirty(handle, vb->vb_bh);
1304         if (ret < 0)
1305                 mlog_errno(ret);
1306 out:
1307         return ret;
1308 }
1309
1310 static int ocfs2_xattr_update_entry(struct inode *inode,
1311                                     handle_t *handle,
1312                                     struct ocfs2_xattr_info *xi,
1313                                     struct ocfs2_xattr_search *xs,
1314                                     struct ocfs2_xattr_value_buf *vb,
1315                                     size_t offs)
1316 {
1317         int ret;
1318
1319         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
1320                             OCFS2_JOURNAL_ACCESS_WRITE);
1321         if (ret) {
1322                 mlog_errno(ret);
1323                 goto out;
1324         }
1325
1326         xs->here->xe_name_offset = cpu_to_le16(offs);
1327         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1328         if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1329                 ocfs2_xattr_set_local(xs->here, 1);
1330         else
1331                 ocfs2_xattr_set_local(xs->here, 0);
1332         ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1333
1334         ret = ocfs2_journal_dirty(handle, vb->vb_bh);
1335         if (ret < 0)
1336                 mlog_errno(ret);
1337 out:
1338         return ret;
1339 }
1340
1341 /*
1342  * ocfs2_xattr_set_value_outside()
1343  *
1344  * Set large size value in B tree.
1345  */
1346 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1347                                          struct ocfs2_xattr_info *xi,
1348                                          struct ocfs2_xattr_search *xs,
1349                                          struct ocfs2_xattr_set_ctxt *ctxt,
1350                                          struct ocfs2_xattr_value_buf *vb,
1351                                          size_t offs)
1352 {
1353         size_t name_len = strlen(xi->name);
1354         void *val = xs->base + offs;
1355         struct ocfs2_xattr_value_root *xv = NULL;
1356         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1357         int ret = 0;
1358
1359         memset(val, 0, size);
1360         memcpy(val, xi->name, name_len);
1361         xv = (struct ocfs2_xattr_value_root *)
1362                 (val + OCFS2_XATTR_SIZE(name_len));
1363         xv->xr_clusters = 0;
1364         xv->xr_last_eb_blk = 0;
1365         xv->xr_list.l_tree_depth = 0;
1366         xv->xr_list.l_count = cpu_to_le16(1);
1367         xv->xr_list.l_next_free_rec = 0;
1368         vb->vb_xv = xv;
1369
1370         ret = ocfs2_xattr_value_truncate(inode, vb, xi->value_len, ctxt);
1371         if (ret < 0) {
1372                 mlog_errno(ret);
1373                 return ret;
1374         }
1375         ret = ocfs2_xattr_update_entry(inode, ctxt->handle, xi, xs, vb, offs);
1376         if (ret < 0) {
1377                 mlog_errno(ret);
1378                 return ret;
1379         }
1380         ret = __ocfs2_xattr_set_value_outside(inode, ctxt->handle, vb,
1381                                               xi->value, xi->value_len);
1382         if (ret < 0)
1383                 mlog_errno(ret);
1384
1385         return ret;
1386 }
1387
1388 /*
1389  * ocfs2_xattr_set_entry_local()
1390  *
1391  * Set, replace or remove extended attribute in local.
1392  */
1393 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1394                                         struct ocfs2_xattr_info *xi,
1395                                         struct ocfs2_xattr_search *xs,
1396                                         struct ocfs2_xattr_entry *last,
1397                                         size_t min_offs)
1398 {
1399         size_t name_len = strlen(xi->name);
1400         int i;
1401
1402         if (xi->value && xs->not_found) {
1403                 /* Insert the new xattr entry. */
1404                 le16_add_cpu(&xs->header->xh_count, 1);
1405                 ocfs2_xattr_set_type(last, xi->name_index);
1406                 ocfs2_xattr_set_local(last, 1);
1407                 last->xe_name_len = name_len;
1408         } else {
1409                 void *first_val;
1410                 void *val;
1411                 size_t offs, size;
1412
1413                 first_val = xs->base + min_offs;
1414                 offs = le16_to_cpu(xs->here->xe_name_offset);
1415                 val = xs->base + offs;
1416
1417                 if (le64_to_cpu(xs->here->xe_value_size) >
1418                     OCFS2_XATTR_INLINE_SIZE)
1419                         size = OCFS2_XATTR_SIZE(name_len) +
1420                                 OCFS2_XATTR_ROOT_SIZE;
1421                 else
1422                         size = OCFS2_XATTR_SIZE(name_len) +
1423                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1424
1425                 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1426                                 OCFS2_XATTR_SIZE(xi->value_len)) {
1427                         /* The old and the new value have the
1428                            same size. Just replace the value. */
1429                         ocfs2_xattr_set_local(xs->here, 1);
1430                         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1431                         /* Clear value bytes. */
1432                         memset(val + OCFS2_XATTR_SIZE(name_len),
1433                                0,
1434                                OCFS2_XATTR_SIZE(xi->value_len));
1435                         memcpy(val + OCFS2_XATTR_SIZE(name_len),
1436                                xi->value,
1437                                xi->value_len);
1438                         return;
1439                 }
1440                 /* Remove the old name+value. */
1441                 memmove(first_val + size, first_val, val - first_val);
1442                 memset(first_val, 0, size);
1443                 xs->here->xe_name_hash = 0;
1444                 xs->here->xe_name_offset = 0;
1445                 ocfs2_xattr_set_local(xs->here, 1);
1446                 xs->here->xe_value_size = 0;
1447
1448                 min_offs += size;
1449
1450                 /* Adjust all value offsets. */
1451                 last = xs->header->xh_entries;
1452                 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1453                         size_t o = le16_to_cpu(last->xe_name_offset);
1454
1455                         if (o < offs)
1456                                 last->xe_name_offset = cpu_to_le16(o + size);
1457                         last += 1;
1458                 }
1459
1460                 if (!xi->value) {
1461                         /* Remove the old entry. */
1462                         last -= 1;
1463                         memmove(xs->here, xs->here + 1,
1464                                 (void *)last - (void *)xs->here);
1465                         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1466                         le16_add_cpu(&xs->header->xh_count, -1);
1467                 }
1468         }
1469         if (xi->value) {
1470                 /* Insert the new name+value. */
1471                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1472                                 OCFS2_XATTR_SIZE(xi->value_len);
1473                 void *val = xs->base + min_offs - size;
1474
1475                 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1476                 memset(val, 0, size);
1477                 memcpy(val, xi->name, name_len);
1478                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1479                        xi->value,
1480                        xi->value_len);
1481                 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1482                 ocfs2_xattr_set_local(xs->here, 1);
1483                 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1484         }
1485
1486         return;
1487 }
1488
1489 /*
1490  * ocfs2_xattr_set_entry()
1491  *
1492  * Set extended attribute entry into inode or block.
1493  *
1494  * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1495  * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1496  * then set value in B tree with set_value_outside().
1497  */
1498 static int ocfs2_xattr_set_entry(struct inode *inode,
1499                                  struct ocfs2_xattr_info *xi,
1500                                  struct ocfs2_xattr_search *xs,
1501                                  struct ocfs2_xattr_set_ctxt *ctxt,
1502                                  int flag)
1503 {
1504         struct ocfs2_xattr_entry *last;
1505         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1506         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1507         size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1508         size_t size_l = 0;
1509         handle_t *handle = ctxt->handle;
1510         int free, i, ret;
1511         struct ocfs2_xattr_info xi_l = {
1512                 .name_index = xi->name_index,
1513                 .name = xi->name,
1514                 .value = xi->value,
1515                 .value_len = xi->value_len,
1516         };
1517         struct ocfs2_xattr_value_buf vb = {
1518                 .vb_bh = xs->xattr_bh,
1519                 .vb_access = ocfs2_journal_access_di,
1520         };
1521
1522         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1523                 BUG_ON(xs->xattr_bh == xs->inode_bh);
1524                 vb.vb_access = ocfs2_journal_access_xb;
1525         } else
1526                 BUG_ON(xs->xattr_bh != xs->inode_bh);
1527
1528         /* Compute min_offs, last and free space. */
1529         last = xs->header->xh_entries;
1530
1531         for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1532                 size_t offs = le16_to_cpu(last->xe_name_offset);
1533                 if (offs < min_offs)
1534                         min_offs = offs;
1535                 last += 1;
1536         }
1537
1538         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
1539         if (free < 0)
1540                 return -EIO;
1541
1542         if (!xs->not_found) {
1543                 size_t size = 0;
1544                 if (ocfs2_xattr_is_local(xs->here))
1545                         size = OCFS2_XATTR_SIZE(name_len) +
1546                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1547                 else
1548                         size = OCFS2_XATTR_SIZE(name_len) +
1549                                 OCFS2_XATTR_ROOT_SIZE;
1550                 free += (size + sizeof(struct ocfs2_xattr_entry));
1551         }
1552         /* Check free space in inode or block */
1553         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1554                 if (free < sizeof(struct ocfs2_xattr_entry) +
1555                            OCFS2_XATTR_SIZE(name_len) +
1556                            OCFS2_XATTR_ROOT_SIZE) {
1557                         ret = -ENOSPC;
1558                         goto out;
1559                 }
1560                 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1561                 xi_l.value = (void *)&def_xv;
1562                 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1563         } else if (xi->value) {
1564                 if (free < sizeof(struct ocfs2_xattr_entry) +
1565                            OCFS2_XATTR_SIZE(name_len) +
1566                            OCFS2_XATTR_SIZE(xi->value_len)) {
1567                         ret = -ENOSPC;
1568                         goto out;
1569                 }
1570         }
1571
1572         if (!xs->not_found) {
1573                 /* For existing extended attribute */
1574                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1575                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1576                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1577                 void *val = xs->base + offs;
1578
1579                 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1580                         /* Replace existing local xattr with tree root */
1581                         ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1582                                                             ctxt, &vb, offs);
1583                         if (ret < 0)
1584                                 mlog_errno(ret);
1585                         goto out;
1586                 } else if (!ocfs2_xattr_is_local(xs->here)) {
1587                         /* For existing xattr which has value outside */
1588                         vb.vb_xv = (struct ocfs2_xattr_value_root *)
1589                                 (val + OCFS2_XATTR_SIZE(name_len));
1590
1591                         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1592                                 /*
1593                                  * If new value need set outside also,
1594                                  * first truncate old value to new value,
1595                                  * then set new value with set_value_outside().
1596                                  */
1597                                 ret = ocfs2_xattr_value_truncate(inode,
1598                                                                  &vb,
1599                                                                  xi->value_len,
1600                                                                  ctxt);
1601                                 if (ret < 0) {
1602                                         mlog_errno(ret);
1603                                         goto out;
1604                                 }
1605
1606                                 ret = ocfs2_xattr_update_entry(inode,
1607                                                                handle,
1608                                                                xi,
1609                                                                xs,
1610                                                                &vb,
1611                                                                offs);
1612                                 if (ret < 0) {
1613                                         mlog_errno(ret);
1614                                         goto out;
1615                                 }
1616
1617                                 ret = __ocfs2_xattr_set_value_outside(inode,
1618                                                                 handle,
1619                                                                 &vb,
1620                                                                 xi->value,
1621                                                                 xi->value_len);
1622                                 if (ret < 0)
1623                                         mlog_errno(ret);
1624                                 goto out;
1625                         } else {
1626                                 /*
1627                                  * If new value need set in local,
1628                                  * just trucate old value to zero.
1629                                  */
1630                                  ret = ocfs2_xattr_value_truncate(inode,
1631                                                                   &vb,
1632                                                                   0,
1633                                                                   ctxt);
1634                                 if (ret < 0)
1635                                         mlog_errno(ret);
1636                         }
1637                 }
1638         }
1639
1640         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), xs->inode_bh,
1641                                       OCFS2_JOURNAL_ACCESS_WRITE);
1642         if (ret) {
1643                 mlog_errno(ret);
1644                 goto out;
1645         }
1646
1647         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1648                 ret = vb.vb_access(handle, INODE_CACHE(inode), vb.vb_bh,
1649                                    OCFS2_JOURNAL_ACCESS_WRITE);
1650                 if (ret) {
1651                         mlog_errno(ret);
1652                         goto out;
1653                 }
1654         }
1655
1656         /*
1657          * Set value in local, include set tree root in local.
1658          * This is the first step for value size >INLINE_SIZE.
1659          */
1660         ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1661
1662         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1663                 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1664                 if (ret < 0) {
1665                         mlog_errno(ret);
1666                         goto out;
1667                 }
1668         }
1669
1670         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1671             (flag & OCFS2_INLINE_XATTR_FL)) {
1672                 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1673                 unsigned int xattrsize = osb->s_xattr_inline_size;
1674
1675                 /*
1676                  * Adjust extent record count or inline data size
1677                  * to reserve space for extended attribute.
1678                  */
1679                 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1680                         struct ocfs2_inline_data *idata = &di->id2.i_data;
1681                         le16_add_cpu(&idata->id_count, -xattrsize);
1682                 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1683                         struct ocfs2_extent_list *el = &di->id2.i_list;
1684                         le16_add_cpu(&el->l_count, -(xattrsize /
1685                                         sizeof(struct ocfs2_extent_rec)));
1686                 }
1687                 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1688         }
1689         /* Update xattr flag */
1690         spin_lock(&oi->ip_lock);
1691         oi->ip_dyn_features |= flag;
1692         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1693         spin_unlock(&oi->ip_lock);
1694
1695         ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1696         if (ret < 0)
1697                 mlog_errno(ret);
1698
1699         if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1700                 /*
1701                  * Set value outside in B tree.
1702                  * This is the second step for value size > INLINE_SIZE.
1703                  */
1704                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1705                 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, ctxt,
1706                                                     &vb, offs);
1707                 if (ret < 0) {
1708                         int ret2;
1709
1710                         mlog_errno(ret);
1711                         /*
1712                          * If set value outside failed, we have to clean
1713                          * the junk tree root we have already set in local.
1714                          */
1715                         ret2 = ocfs2_xattr_cleanup(inode, ctxt->handle,
1716                                                    xi, xs, &vb, offs);
1717                         if (ret2 < 0)
1718                                 mlog_errno(ret2);
1719                 }
1720         }
1721 out:
1722         return ret;
1723 }
1724
1725 static int ocfs2_remove_value_outside(struct inode*inode,
1726                                       struct ocfs2_xattr_value_buf *vb,
1727                                       struct ocfs2_xattr_header *header)
1728 {
1729         int ret = 0, i;
1730         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1731         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
1732
1733         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
1734
1735         ctxt.handle = ocfs2_start_trans(osb,
1736                                         ocfs2_remove_extent_credits(osb->sb));
1737         if (IS_ERR(ctxt.handle)) {
1738                 ret = PTR_ERR(ctxt.handle);
1739                 mlog_errno(ret);
1740                 goto out;
1741         }
1742
1743         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1744                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1745
1746                 if (!ocfs2_xattr_is_local(entry)) {
1747                         void *val;
1748
1749                         val = (void *)header +
1750                                 le16_to_cpu(entry->xe_name_offset);
1751                         vb->vb_xv = (struct ocfs2_xattr_value_root *)
1752                                 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1753                         ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
1754                         if (ret < 0) {
1755                                 mlog_errno(ret);
1756                                 break;
1757                         }
1758                 }
1759         }
1760
1761         ocfs2_commit_trans(osb, ctxt.handle);
1762         ocfs2_schedule_truncate_log_flush(osb, 1);
1763         ocfs2_run_deallocs(osb, &ctxt.dealloc);
1764 out:
1765         return ret;
1766 }
1767
1768 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1769                                     struct buffer_head *di_bh)
1770 {
1771
1772         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1773         struct ocfs2_xattr_header *header;
1774         int ret;
1775         struct ocfs2_xattr_value_buf vb = {
1776                 .vb_bh = di_bh,
1777                 .vb_access = ocfs2_journal_access_di,
1778         };
1779
1780         header = (struct ocfs2_xattr_header *)
1781                  ((void *)di + inode->i_sb->s_blocksize -
1782                  le16_to_cpu(di->i_xattr_inline_size));
1783
1784         ret = ocfs2_remove_value_outside(inode, &vb, header);
1785
1786         return ret;
1787 }
1788
1789 static int ocfs2_xattr_block_remove(struct inode *inode,
1790                                     struct buffer_head *blk_bh)
1791 {
1792         struct ocfs2_xattr_block *xb;
1793         int ret = 0;
1794         struct ocfs2_xattr_value_buf vb = {
1795                 .vb_bh = blk_bh,
1796                 .vb_access = ocfs2_journal_access_xb,
1797         };
1798
1799         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1800         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1801                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1802                 ret = ocfs2_remove_value_outside(inode, &vb, header);
1803         } else
1804                 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
1805
1806         return ret;
1807 }
1808
1809 static int ocfs2_xattr_free_block(struct inode *inode,
1810                                   u64 block)
1811 {
1812         struct inode *xb_alloc_inode;
1813         struct buffer_head *xb_alloc_bh = NULL;
1814         struct buffer_head *blk_bh = NULL;
1815         struct ocfs2_xattr_block *xb;
1816         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1817         handle_t *handle;
1818         int ret = 0;
1819         u64 blk, bg_blkno;
1820         u16 bit;
1821
1822         ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
1823         if (ret < 0) {
1824                 mlog_errno(ret);
1825                 goto out;
1826         }
1827
1828         ret = ocfs2_xattr_block_remove(inode, blk_bh);
1829         if (ret < 0) {
1830                 mlog_errno(ret);
1831                 goto out;
1832         }
1833
1834         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1835         blk = le64_to_cpu(xb->xb_blkno);
1836         bit = le16_to_cpu(xb->xb_suballoc_bit);
1837         bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1838
1839         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1840                                 EXTENT_ALLOC_SYSTEM_INODE,
1841                                 le16_to_cpu(xb->xb_suballoc_slot));
1842         if (!xb_alloc_inode) {
1843                 ret = -ENOMEM;
1844                 mlog_errno(ret);
1845                 goto out;
1846         }
1847         mutex_lock(&xb_alloc_inode->i_mutex);
1848
1849         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1850         if (ret < 0) {
1851                 mlog_errno(ret);
1852                 goto out_mutex;
1853         }
1854
1855         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1856         if (IS_ERR(handle)) {
1857                 ret = PTR_ERR(handle);
1858                 mlog_errno(ret);
1859                 goto out_unlock;
1860         }
1861
1862         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1863                                        bit, bg_blkno, 1);
1864         if (ret < 0)
1865                 mlog_errno(ret);
1866
1867         ocfs2_commit_trans(osb, handle);
1868 out_unlock:
1869         ocfs2_inode_unlock(xb_alloc_inode, 1);
1870         brelse(xb_alloc_bh);
1871 out_mutex:
1872         mutex_unlock(&xb_alloc_inode->i_mutex);
1873         iput(xb_alloc_inode);
1874 out:
1875         brelse(blk_bh);
1876         return ret;
1877 }
1878
1879 /*
1880  * ocfs2_xattr_remove()
1881  *
1882  * Free extended attribute resources associated with this inode.
1883  */
1884 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1885 {
1886         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1887         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1888         handle_t *handle;
1889         int ret;
1890
1891         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1892                 return 0;
1893
1894         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1895                 return 0;
1896
1897         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1898                 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1899                 if (ret < 0) {
1900                         mlog_errno(ret);
1901                         goto out;
1902                 }
1903         }
1904
1905         if (di->i_xattr_loc) {
1906                 ret = ocfs2_xattr_free_block(inode,
1907                                              le64_to_cpu(di->i_xattr_loc));
1908                 if (ret < 0) {
1909                         mlog_errno(ret);
1910                         goto out;
1911                 }
1912         }
1913
1914         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1915                                    OCFS2_INODE_UPDATE_CREDITS);
1916         if (IS_ERR(handle)) {
1917                 ret = PTR_ERR(handle);
1918                 mlog_errno(ret);
1919                 goto out;
1920         }
1921         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
1922                                       OCFS2_JOURNAL_ACCESS_WRITE);
1923         if (ret) {
1924                 mlog_errno(ret);
1925                 goto out_commit;
1926         }
1927
1928         di->i_xattr_loc = 0;
1929
1930         spin_lock(&oi->ip_lock);
1931         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1932         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1933         spin_unlock(&oi->ip_lock);
1934
1935         ret = ocfs2_journal_dirty(handle, di_bh);
1936         if (ret < 0)
1937                 mlog_errno(ret);
1938 out_commit:
1939         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1940 out:
1941         return ret;
1942 }
1943
1944 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1945                                         struct ocfs2_dinode *di)
1946 {
1947         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1948         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1949         int free;
1950
1951         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1952                 return 0;
1953
1954         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1955                 struct ocfs2_inline_data *idata = &di->id2.i_data;
1956                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1957         } else if (ocfs2_inode_is_fast_symlink(inode)) {
1958                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1959                         le64_to_cpu(di->i_size);
1960         } else {
1961                 struct ocfs2_extent_list *el = &di->id2.i_list;
1962                 free = (le16_to_cpu(el->l_count) -
1963                         le16_to_cpu(el->l_next_free_rec)) *
1964                         sizeof(struct ocfs2_extent_rec);
1965         }
1966         if (free >= xattrsize)
1967                 return 1;
1968
1969         return 0;
1970 }
1971
1972 /*
1973  * ocfs2_xattr_ibody_find()
1974  *
1975  * Find extended attribute in inode block and
1976  * fill search info into struct ocfs2_xattr_search.
1977  */
1978 static int ocfs2_xattr_ibody_find(struct inode *inode,
1979                                   int name_index,
1980                                   const char *name,
1981                                   struct ocfs2_xattr_search *xs)
1982 {
1983         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1984         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1985         int ret;
1986         int has_space = 0;
1987
1988         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1989                 return 0;
1990
1991         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1992                 down_read(&oi->ip_alloc_sem);
1993                 has_space = ocfs2_xattr_has_space_inline(inode, di);
1994                 up_read(&oi->ip_alloc_sem);
1995                 if (!has_space)
1996                         return 0;
1997         }
1998
1999         xs->xattr_bh = xs->inode_bh;
2000         xs->end = (void *)di + inode->i_sb->s_blocksize;
2001         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2002                 xs->header = (struct ocfs2_xattr_header *)
2003                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2004         else
2005                 xs->header = (struct ocfs2_xattr_header *)
2006                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2007         xs->base = (void *)xs->header;
2008         xs->here = xs->header->xh_entries;
2009
2010         /* Find the named attribute. */
2011         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2012                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2013                 if (ret && ret != -ENODATA)
2014                         return ret;
2015                 xs->not_found = ret;
2016         }
2017
2018         return 0;
2019 }
2020
2021 /*
2022  * ocfs2_xattr_ibody_set()
2023  *
2024  * Set, replace or remove an extended attribute into inode block.
2025  *
2026  */
2027 static int ocfs2_xattr_ibody_set(struct inode *inode,
2028                                  struct ocfs2_xattr_info *xi,
2029                                  struct ocfs2_xattr_search *xs,
2030                                  struct ocfs2_xattr_set_ctxt *ctxt)
2031 {
2032         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2033         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2034         int ret;
2035
2036         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2037                 return -ENOSPC;
2038
2039         down_write(&oi->ip_alloc_sem);
2040         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2041                 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2042                         ret = -ENOSPC;
2043                         goto out;
2044                 }
2045         }
2046
2047         ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2048                                 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
2049 out:
2050         up_write(&oi->ip_alloc_sem);
2051
2052         return ret;
2053 }
2054
2055 /*
2056  * ocfs2_xattr_block_find()
2057  *
2058  * Find extended attribute in external block and
2059  * fill search info into struct ocfs2_xattr_search.
2060  */
2061 static int ocfs2_xattr_block_find(struct inode *inode,
2062                                   int name_index,
2063                                   const char *name,
2064                                   struct ocfs2_xattr_search *xs)
2065 {
2066         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2067         struct buffer_head *blk_bh = NULL;
2068         struct ocfs2_xattr_block *xb;
2069         int ret = 0;
2070
2071         if (!di->i_xattr_loc)
2072                 return ret;
2073
2074         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2075                                      &blk_bh);
2076         if (ret < 0) {
2077                 mlog_errno(ret);
2078                 return ret;
2079         }
2080
2081         xs->xattr_bh = blk_bh;
2082         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2083
2084         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2085                 xs->header = &xb->xb_attrs.xb_header;
2086                 xs->base = (void *)xs->header;
2087                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2088                 xs->here = xs->header->xh_entries;
2089
2090                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2091         } else
2092                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2093                                                    name_index,
2094                                                    name, xs);
2095
2096         if (ret && ret != -ENODATA) {
2097                 xs->xattr_bh = NULL;
2098                 goto cleanup;
2099         }
2100         xs->not_found = ret;
2101         return 0;
2102 cleanup:
2103         brelse(blk_bh);
2104
2105         return ret;
2106 }
2107
2108 /*
2109  * ocfs2_xattr_block_set()
2110  *
2111  * Set, replace or remove an extended attribute into external block.
2112  *
2113  */
2114 static int ocfs2_xattr_block_set(struct inode *inode,
2115                                  struct ocfs2_xattr_info *xi,
2116                                  struct ocfs2_xattr_search *xs,
2117                                  struct ocfs2_xattr_set_ctxt *ctxt)
2118 {
2119         struct buffer_head *new_bh = NULL;
2120         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2121         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)xs->inode_bh->b_data;
2122         handle_t *handle = ctxt->handle;
2123         struct ocfs2_xattr_block *xblk = NULL;
2124         u16 suballoc_bit_start;
2125         u32 num_got;
2126         u64 first_blkno;
2127         int ret;
2128
2129         if (!xs->xattr_bh) {
2130                 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2131                                               xs->inode_bh,
2132                                               OCFS2_JOURNAL_ACCESS_CREATE);
2133                 if (ret < 0) {
2134                         mlog_errno(ret);
2135                         goto end;
2136                 }
2137
2138                 ret = ocfs2_claim_metadata(osb, handle, ctxt->meta_ac, 1,
2139                                            &suballoc_bit_start, &num_got,
2140                                            &first_blkno);
2141                 if (ret < 0) {
2142                         mlog_errno(ret);
2143                         goto end;
2144                 }
2145
2146                 new_bh = sb_getblk(inode->i_sb, first_blkno);
2147                 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2148
2149                 ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode),
2150                                               new_bh,
2151                                               OCFS2_JOURNAL_ACCESS_CREATE);
2152                 if (ret < 0) {
2153                         mlog_errno(ret);
2154                         goto end;
2155                 }
2156
2157                 /* Initialize ocfs2_xattr_block */
2158                 xs->xattr_bh = new_bh;
2159                 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2160                 memset(xblk, 0, inode->i_sb->s_blocksize);
2161                 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2162                 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
2163                 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2164                 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
2165                 xblk->xb_blkno = cpu_to_le64(first_blkno);
2166
2167                 xs->header = &xblk->xb_attrs.xb_header;
2168                 xs->base = (void *)xs->header;
2169                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2170                 xs->here = xs->header->xh_entries;
2171
2172                 ret = ocfs2_journal_dirty(handle, new_bh);
2173                 if (ret < 0) {
2174                         mlog_errno(ret);
2175                         goto end;
2176                 }
2177                 di->i_xattr_loc = cpu_to_le64(first_blkno);
2178                 ocfs2_journal_dirty(handle, xs->inode_bh);
2179         } else
2180                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2181
2182         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2183                 /* Set extended attribute into external block */
2184                 ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2185                                             OCFS2_HAS_XATTR_FL);
2186                 if (!ret || ret != -ENOSPC)
2187                         goto end;
2188
2189                 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2190                 if (ret)
2191                         goto end;
2192         }
2193
2194         ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2195
2196 end:
2197
2198         return ret;
2199 }
2200
2201 /* Check whether the new xattr can be inserted into the inode. */
2202 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2203                                        struct ocfs2_xattr_info *xi,
2204                                        struct ocfs2_xattr_search *xs)
2205 {
2206         u64 value_size;
2207         struct ocfs2_xattr_entry *last;
2208         int free, i;
2209         size_t min_offs = xs->end - xs->base;
2210
2211         if (!xs->header)
2212                 return 0;
2213
2214         last = xs->header->xh_entries;
2215
2216         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2217                 size_t offs = le16_to_cpu(last->xe_name_offset);
2218                 if (offs < min_offs)
2219                         min_offs = offs;
2220                 last += 1;
2221         }
2222
2223         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
2224         if (free < 0)
2225                 return 0;
2226
2227         BUG_ON(!xs->not_found);
2228
2229         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2230                 value_size = OCFS2_XATTR_ROOT_SIZE;
2231         else
2232                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
2233
2234         if (free >= sizeof(struct ocfs2_xattr_entry) +
2235                    OCFS2_XATTR_SIZE(strlen(xi->name)) + value_size)
2236                 return 1;
2237
2238         return 0;
2239 }
2240
2241 static int ocfs2_calc_xattr_set_need(struct inode *inode,
2242                                      struct ocfs2_dinode *di,
2243                                      struct ocfs2_xattr_info *xi,
2244                                      struct ocfs2_xattr_search *xis,
2245                                      struct ocfs2_xattr_search *xbs,
2246                                      int *clusters_need,
2247                                      int *meta_need,
2248                                      int *credits_need)
2249 {
2250         int ret = 0, old_in_xb = 0;
2251         int clusters_add = 0, meta_add = 0, credits = 0;
2252         struct buffer_head *bh = NULL;
2253         struct ocfs2_xattr_block *xb = NULL;
2254         struct ocfs2_xattr_entry *xe = NULL;
2255         struct ocfs2_xattr_value_root *xv = NULL;
2256         char *base = NULL;
2257         int name_offset, name_len = 0;
2258         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
2259                                                     xi->value_len);
2260         u64 value_size;
2261
2262         /*
2263          * Calculate the clusters we need to write.
2264          * No matter whether we replace an old one or add a new one,
2265          * we need this for writing.
2266          */
2267         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2268                 credits += new_clusters *
2269                            ocfs2_clusters_to_blocks(inode->i_sb, 1);
2270
2271         if (xis->not_found && xbs->not_found) {
2272                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2273
2274                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2275                         clusters_add += new_clusters;
2276                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2277                                                         &def_xv.xv.xr_list,
2278                                                         new_clusters);
2279                 }
2280
2281                 goto meta_guess;
2282         }
2283
2284         if (!xis->not_found) {
2285                 xe = xis->here;
2286                 name_offset = le16_to_cpu(xe->xe_name_offset);
2287                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2288                 base = xis->base;
2289                 credits += OCFS2_INODE_UPDATE_CREDITS;
2290         } else {
2291                 int i, block_off = 0;
2292                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2293                 xe = xbs->here;
2294                 name_offset = le16_to_cpu(xe->xe_name_offset);
2295                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2296                 i = xbs->here - xbs->header->xh_entries;
2297                 old_in_xb = 1;
2298
2299                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2300                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
2301                                                         bucket_xh(xbs->bucket),
2302                                                         i, &block_off,
2303                                                         &name_offset);
2304                         base = bucket_block(xbs->bucket, block_off);
2305                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2306                 } else {
2307                         base = xbs->base;
2308                         credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
2309                 }
2310         }
2311
2312         /*
2313          * delete a xattr doesn't need metadata and cluster allocation.
2314          * so just calculate the credits and return.
2315          *
2316          * The credits for removing the value tree will be extended
2317          * by ocfs2_remove_extent itself.
2318          */
2319         if (!xi->value) {
2320                 if (!ocfs2_xattr_is_local(xe))
2321                         credits += ocfs2_remove_extent_credits(inode->i_sb);
2322
2323                 goto out;
2324         }
2325
2326         /* do cluster allocation guess first. */
2327         value_size = le64_to_cpu(xe->xe_value_size);
2328
2329         if (old_in_xb) {
2330                 /*
2331                  * In xattr set, we always try to set the xe in inode first,
2332                  * so if it can be inserted into inode successfully, the old
2333                  * one will be removed from the xattr block, and this xattr
2334                  * will be inserted into inode as a new xattr in inode.
2335                  */
2336                 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
2337                         clusters_add += new_clusters;
2338                         credits += ocfs2_remove_extent_credits(inode->i_sb) +
2339                                     OCFS2_INODE_UPDATE_CREDITS;
2340                         if (!ocfs2_xattr_is_local(xe))
2341                                 credits += ocfs2_calc_extend_credits(
2342                                                         inode->i_sb,
2343                                                         &def_xv.xv.xr_list,
2344                                                         new_clusters);
2345                         goto out;
2346                 }
2347         }
2348
2349         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2350                 /* the new values will be stored outside. */
2351                 u32 old_clusters = 0;
2352
2353                 if (!ocfs2_xattr_is_local(xe)) {
2354                         old_clusters =  ocfs2_clusters_for_bytes(inode->i_sb,
2355                                                                  value_size);
2356                         xv = (struct ocfs2_xattr_value_root *)
2357                              (base + name_offset + name_len);
2358                         value_size = OCFS2_XATTR_ROOT_SIZE;
2359                 } else
2360                         xv = &def_xv.xv;
2361
2362                 if (old_clusters >= new_clusters) {
2363                         credits += ocfs2_remove_extent_credits(inode->i_sb);
2364                         goto out;
2365                 } else {
2366                         meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
2367                         clusters_add += new_clusters - old_clusters;
2368                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2369                                                              &xv->xr_list,
2370                                                              new_clusters -
2371                                                              old_clusters);
2372                         if (value_size >= OCFS2_XATTR_ROOT_SIZE)
2373                                 goto out;
2374                 }
2375         } else {
2376                 /*
2377                  * Now the new value will be stored inside. So if the new
2378                  * value is smaller than the size of value root or the old
2379                  * value, we don't need any allocation, otherwise we have
2380                  * to guess metadata allocation.
2381                  */
2382                 if ((ocfs2_xattr_is_local(xe) && value_size >= xi->value_len) ||
2383                     (!ocfs2_xattr_is_local(xe) &&
2384                      OCFS2_XATTR_ROOT_SIZE >= xi->value_len))
2385                         goto out;
2386         }
2387
2388 meta_guess:
2389         /* calculate metadata allocation. */
2390         if (di->i_xattr_loc) {
2391                 if (!xbs->xattr_bh) {
2392                         ret = ocfs2_read_xattr_block(inode,
2393                                                      le64_to_cpu(di->i_xattr_loc),
2394                                                      &bh);
2395                         if (ret) {
2396                                 mlog_errno(ret);
2397                                 goto out;
2398                         }
2399
2400                         xb = (struct ocfs2_xattr_block *)bh->b_data;
2401                 } else
2402                         xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2403
2404                 /*
2405                  * If there is already an xattr tree, good, we can calculate
2406                  * like other b-trees. Otherwise we may have the chance of
2407                  * create a tree, the credit calculation is borrowed from
2408                  * ocfs2_calc_extend_credits with root_el = NULL. And the
2409                  * new tree will be cluster based, so no meta is needed.
2410                  */
2411                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2412                         struct ocfs2_extent_list *el =
2413                                  &xb->xb_attrs.xb_root.xt_list;
2414                         meta_add += ocfs2_extend_meta_needed(el);
2415                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2416                                                              el, 1);
2417                 } else
2418                         credits += OCFS2_SUBALLOC_ALLOC + 1;
2419
2420                 /*
2421                  * This cluster will be used either for new bucket or for
2422                  * new xattr block.
2423                  * If the cluster size is the same as the bucket size, one
2424                  * more is needed since we may need to extend the bucket
2425                  * also.
2426                  */
2427                 clusters_add += 1;
2428                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2429                 if (OCFS2_XATTR_BUCKET_SIZE ==
2430                         OCFS2_SB(inode->i_sb)->s_clustersize) {
2431                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2432                         clusters_add += 1;
2433                 }
2434         } else {
2435                 meta_add += 1;
2436                 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
2437         }
2438 out:
2439         if (clusters_need)
2440                 *clusters_need = clusters_add;
2441         if (meta_need)
2442                 *meta_need = meta_add;
2443         if (credits_need)
2444                 *credits_need = credits;
2445         brelse(bh);
2446         return ret;
2447 }
2448
2449 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
2450                                      struct ocfs2_dinode *di,
2451                                      struct ocfs2_xattr_info *xi,
2452                                      struct ocfs2_xattr_search *xis,
2453                                      struct ocfs2_xattr_search *xbs,
2454                                      struct ocfs2_xattr_set_ctxt *ctxt,
2455                                      int extra_meta,
2456                                      int *credits)
2457 {
2458         int clusters_add, meta_add, ret;
2459         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2460
2461         memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
2462
2463         ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
2464
2465         ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
2466                                         &clusters_add, &meta_add, credits);
2467         if (ret) {
2468                 mlog_errno(ret);
2469                 return ret;
2470         }
2471
2472         meta_add += extra_meta;
2473         mlog(0, "Set xattr %s, reserve meta blocks = %d, clusters = %d, "
2474              "credits = %d\n", xi->name, meta_add, clusters_add, *credits);
2475
2476         if (meta_add) {
2477                 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
2478                                                         &ctxt->meta_ac);
2479                 if (ret) {
2480                         mlog_errno(ret);
2481                         goto out;
2482                 }
2483         }
2484
2485         if (clusters_add) {
2486                 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
2487                 if (ret)
2488                         mlog_errno(ret);
2489         }
2490 out:
2491         if (ret) {
2492                 if (ctxt->meta_ac) {
2493                         ocfs2_free_alloc_context(ctxt->meta_ac);
2494                         ctxt->meta_ac = NULL;
2495                 }
2496
2497                 /*
2498                  * We cannot have an error and a non null ctxt->data_ac.
2499                  */
2500         }
2501
2502         return ret;
2503 }
2504
2505 static int __ocfs2_xattr_set_handle(struct inode *inode,
2506                                     struct ocfs2_dinode *di,
2507                                     struct ocfs2_xattr_info *xi,
2508                                     struct ocfs2_xattr_search *xis,
2509                                     struct ocfs2_xattr_search *xbs,
2510                                     struct ocfs2_xattr_set_ctxt *ctxt)
2511 {
2512         int ret = 0, credits, old_found;
2513
2514         if (!xi->value) {
2515                 /* Remove existing extended attribute */
2516                 if (!xis->not_found)
2517                         ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2518                 else if (!xbs->not_found)
2519                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2520         } else {
2521                 /* We always try to set extended attribute into inode first*/
2522                 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2523                 if (!ret && !xbs->not_found) {
2524                         /*
2525                          * If succeed and that extended attribute existing in
2526                          * external block, then we will remove it.
2527                          */
2528                         xi->value = NULL;
2529                         xi->value_len = 0;
2530
2531                         old_found = xis->not_found;
2532                         xis->not_found = -ENODATA;
2533                         ret = ocfs2_calc_xattr_set_need(inode,
2534                                                         di,
2535                                                         xi,
2536                                                         xis,
2537                                                         xbs,
2538                                                         NULL,
2539                                                         NULL,
2540                                                         &credits);
2541                         xis->not_found = old_found;
2542                         if (ret) {
2543                                 mlog_errno(ret);
2544                                 goto out;
2545                         }
2546
2547                         ret = ocfs2_extend_trans(ctxt->handle, credits +
2548                                         ctxt->handle->h_buffer_credits);
2549                         if (ret) {
2550                                 mlog_errno(ret);
2551                                 goto out;
2552                         }
2553                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2554                 } else if (ret == -ENOSPC) {
2555                         if (di->i_xattr_loc && !xbs->xattr_bh) {
2556                                 ret = ocfs2_xattr_block_find(inode,
2557                                                              xi->name_index,
2558                                                              xi->name, xbs);
2559                                 if (ret)
2560                                         goto out;
2561
2562                                 old_found = xis->not_found;
2563                                 xis->not_found = -ENODATA;
2564                                 ret = ocfs2_calc_xattr_set_need(inode,
2565                                                                 di,
2566                                                                 xi,
2567                                                                 xis,
2568                                                                 xbs,
2569                                                                 NULL,
2570                                                                 NULL,
2571                                                                 &credits);
2572                                 xis->not_found = old_found;
2573                                 if (ret) {
2574                                         mlog_errno(ret);
2575                                         goto out;
2576                                 }
2577
2578                                 ret = ocfs2_extend_trans(ctxt->handle, credits +
2579                                         ctxt->handle->h_buffer_credits);
2580                                 if (ret) {
2581                                         mlog_errno(ret);
2582                                         goto out;
2583                                 }
2584                         }
2585                         /*
2586                          * If no space in inode, we will set extended attribute
2587                          * into external block.
2588                          */
2589                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2590                         if (ret)
2591                                 goto out;
2592                         if (!xis->not_found) {
2593                                 /*
2594                                  * If succeed and that extended attribute
2595                                  * existing in inode, we will remove it.
2596                                  */
2597                                 xi->value = NULL;
2598                                 xi->value_len = 0;
2599                                 xbs->not_found = -ENODATA;
2600                                 ret = ocfs2_calc_xattr_set_need(inode,
2601                                                                 di,
2602                                                                 xi,
2603                                                                 xis,
2604                                                                 xbs,
2605                                                                 NULL,
2606                                                                 NULL,
2607                                                                 &credits);
2608                                 if (ret) {
2609                                         mlog_errno(ret);
2610                                         goto out;
2611                                 }
2612
2613                                 ret = ocfs2_extend_trans(ctxt->handle, credits +
2614                                                 ctxt->handle->h_buffer_credits);
2615                                 if (ret) {
2616                                         mlog_errno(ret);
2617                                         goto out;
2618                                 }
2619                                 ret = ocfs2_xattr_ibody_set(inode, xi,
2620                                                             xis, ctxt);
2621                         }
2622                 }
2623         }
2624
2625         if (!ret) {
2626                 /* Update inode ctime. */
2627                 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2628                                               xis->inode_bh,
2629                                               OCFS2_JOURNAL_ACCESS_WRITE);
2630                 if (ret) {
2631                         mlog_errno(ret);
2632                         goto out;
2633                 }
2634
2635                 inode->i_ctime = CURRENT_TIME;
2636                 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
2637                 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
2638                 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
2639         }
2640 out:
2641         return ret;
2642 }
2643
2644 /*
2645  * This function only called duing creating inode
2646  * for init security/acl xattrs of the new inode.
2647  * All transanction credits have been reserved in mknod.
2648  */
2649 int ocfs2_xattr_set_handle(handle_t *handle,
2650                            struct inode *inode,
2651                            struct buffer_head *di_bh,
2652                            int name_index,
2653                            const char *name,
2654                            const void *value,
2655                            size_t value_len,
2656                            int flags,
2657                            struct ocfs2_alloc_context *meta_ac,
2658                            struct ocfs2_alloc_context *data_ac)
2659 {
2660         struct ocfs2_dinode *di;
2661         int ret;
2662
2663         struct ocfs2_xattr_info xi = {
2664                 .name_index = name_index,
2665                 .name = name,
2666                 .value = value,
2667                 .value_len = value_len,
2668         };
2669
2670         struct ocfs2_xattr_search xis = {
2671                 .not_found = -ENODATA,
2672         };
2673
2674         struct ocfs2_xattr_search xbs = {
2675                 .not_found = -ENODATA,
2676         };
2677
2678         struct ocfs2_xattr_set_ctxt ctxt = {
2679                 .handle = handle,
2680                 .meta_ac = meta_ac,
2681                 .data_ac = data_ac,
2682         };
2683
2684         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2685                 return -EOPNOTSUPP;
2686
2687         /*
2688          * In extreme situation, may need xattr bucket when
2689          * block size is too small. And we have already reserved
2690          * the credits for bucket in mknod.
2691          */
2692         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
2693                 xbs.bucket = ocfs2_xattr_bucket_new(inode);
2694                 if (!xbs.bucket) {
2695                         mlog_errno(-ENOMEM);
2696                         return -ENOMEM;
2697                 }
2698         }
2699
2700         xis.inode_bh = xbs.inode_bh = di_bh;
2701         di = (struct ocfs2_dinode *)di_bh->b_data;
2702
2703         down_write(&OCFS2_I(inode)->ip_xattr_sem);
2704
2705         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2706         if (ret)
2707                 goto cleanup;
2708         if (xis.not_found) {
2709                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2710                 if (ret)
2711                         goto cleanup;
2712         }
2713
2714         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
2715
2716 cleanup:
2717         up_write(&OCFS2_I(inode)->ip_xattr_sem);
2718         brelse(xbs.xattr_bh);
2719         ocfs2_xattr_bucket_free(xbs.bucket);
2720
2721         return ret;
2722 }
2723
2724 /*
2725  * ocfs2_xattr_set()
2726  *
2727  * Set, replace or remove an extended attribute for this inode.
2728  * value is NULL to remove an existing extended attribute, else either
2729  * create or replace an extended attribute.
2730  */
2731 int ocfs2_xattr_set(struct inode *inode,
2732                     int name_index,
2733                     const char *name,
2734                     const void *value,
2735                     size_t value_len,
2736                     int flags)
2737 {
2738         struct buffer_head *di_bh = NULL;
2739         struct ocfs2_dinode *di;
2740         int ret, credits, ref_meta = 0, ref_credits = 0;
2741         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2742         struct inode *tl_inode = osb->osb_tl_inode;
2743         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2744         struct ocfs2_refcount_tree *ref_tree = NULL;
2745
2746         struct ocfs2_xattr_info xi = {
2747                 .name_index = name_index,
2748                 .name = name,
2749                 .value = value,
2750                 .value_len = value_len,
2751         };
2752
2753         struct ocfs2_xattr_search xis = {
2754                 .not_found = -ENODATA,
2755         };
2756
2757         struct ocfs2_xattr_search xbs = {
2758                 .not_found = -ENODATA,
2759         };
2760
2761         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2762                 return -EOPNOTSUPP;
2763
2764         /*
2765          * Only xbs will be used on indexed trees.  xis doesn't need a
2766          * bucket.
2767          */
2768         xbs.bucket = ocfs2_xattr_bucket_new(inode);
2769         if (!xbs.bucket) {
2770                 mlog_errno(-ENOMEM);
2771                 return -ENOMEM;
2772         }
2773
2774         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2775         if (ret < 0) {
2776                 mlog_errno(ret);
2777                 goto cleanup_nolock;
2778         }
2779         xis.inode_bh = xbs.inode_bh = di_bh;
2780         di = (struct ocfs2_dinode *)di_bh->b_data;
2781
2782         down_write(&OCFS2_I(inode)->ip_xattr_sem);
2783         /*
2784          * Scan inode and external block to find the same name
2785          * extended attribute and collect search infomation.
2786          */
2787         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2788         if (ret)
2789                 goto cleanup;
2790         if (xis.not_found) {
2791                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2792                 if (ret)
2793                         goto cleanup;
2794         }
2795
2796         if (xis.not_found && xbs.not_found) {
2797                 ret = -ENODATA;
2798                 if (flags & XATTR_REPLACE)
2799                         goto cleanup;
2800                 ret = 0;
2801                 if (!value)
2802                         goto cleanup;
2803         } else {
2804                 ret = -EEXIST;
2805                 if (flags & XATTR_CREATE)
2806                         goto cleanup;
2807         }
2808
2809         /* Check whether the value is refcounted and do some prepartion. */
2810         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
2811             (!xis.not_found || !xbs.not_found)) {
2812                 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
2813                                                    &xis, &xbs, &ref_tree,
2814                                                    &ref_meta, &ref_credits);
2815                 if (ret) {
2816                         mlog_errno(ret);
2817                         goto cleanup;
2818                 }
2819         }
2820
2821         mutex_lock(&tl_inode->i_mutex);
2822
2823         if (ocfs2_truncate_log_needs_flush(osb)) {
2824                 ret = __ocfs2_flush_truncate_log(osb);
2825                 if (ret < 0) {
2826                         mutex_unlock(&tl_inode->i_mutex);
2827                         mlog_errno(ret);
2828                         goto cleanup;
2829                 }
2830         }
2831         mutex_unlock(&tl_inode->i_mutex);
2832
2833         ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
2834                                         &xbs, &ctxt, ref_meta, &credits);
2835         if (ret) {
2836                 mlog_errno(ret);
2837                 goto cleanup;
2838         }
2839
2840         /* we need to update inode's ctime field, so add credit for it. */
2841         credits += OCFS2_INODE_UPDATE_CREDITS;
2842         ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
2843         if (IS_ERR(ctxt.handle)) {
2844                 ret = PTR_ERR(ctxt.handle);
2845                 mlog_errno(ret);
2846                 goto cleanup;
2847         }
2848
2849         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
2850
2851         ocfs2_commit_trans(osb, ctxt.handle);
2852
2853         if (ctxt.data_ac)
2854                 ocfs2_free_alloc_context(ctxt.data_ac);
2855         if (ctxt.meta_ac)
2856                 ocfs2_free_alloc_context(ctxt.meta_ac);
2857         if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
2858                 ocfs2_schedule_truncate_log_flush(osb, 1);
2859         ocfs2_run_deallocs(osb, &ctxt.dealloc);
2860 cleanup:
2861         if (ref_tree)
2862                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
2863         up_write(&OCFS2_I(inode)->ip_xattr_sem);
2864         ocfs2_inode_unlock(inode, 1);
2865 cleanup_nolock:
2866         brelse(di_bh);
2867         brelse(xbs.xattr_bh);
2868         ocfs2_xattr_bucket_free(xbs.bucket);
2869
2870         return ret;
2871 }
2872
2873 /*
2874  * Find the xattr extent rec which may contains name_hash.
2875  * e_cpos will be the first name hash of the xattr rec.
2876  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2877  */
2878 static int ocfs2_xattr_get_rec(struct inode *inode,
2879                                u32 name_hash,
2880                                u64 *p_blkno,
2881                                u32 *e_cpos,
2882                                u32 *num_clusters,
2883                                struct ocfs2_extent_list *el)
2884 {
2885         int ret = 0, i;
2886         struct buffer_head *eb_bh = NULL;
2887         struct ocfs2_extent_block *eb;
2888         struct ocfs2_extent_rec *rec = NULL;
2889         u64 e_blkno = 0;
2890
2891         if (el->l_tree_depth) {
2892                 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
2893                                       &eb_bh);
2894                 if (ret) {
2895                         mlog_errno(ret);
2896                         goto out;
2897                 }
2898
2899                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2900                 el = &eb->h_list;
2901
2902                 if (el->l_tree_depth) {
2903                         ocfs2_error(inode->i_sb,
2904                                     "Inode %lu has non zero tree depth in "
2905                                     "xattr tree block %llu\n", inode->i_ino,
2906                                     (unsigned long long)eb_bh->b_blocknr);
2907                         ret = -EROFS;
2908                         goto out;
2909                 }
2910         }
2911
2912         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2913                 rec = &el->l_recs[i];
2914
2915                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2916                         e_blkno = le64_to_cpu(rec->e_blkno);
2917                         break;
2918                 }
2919         }
2920
2921         if (!e_blkno) {
2922                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2923                             "record (%u, %u, 0) in xattr", inode->i_ino,
2924                             le32_to_cpu(rec->e_cpos),
2925                             ocfs2_rec_clusters(el, rec));
2926                 ret = -EROFS;
2927                 goto out;
2928         }
2929
2930         *p_blkno = le64_to_cpu(rec->e_blkno);
2931         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2932         if (e_cpos)
2933                 *e_cpos = le32_to_cpu(rec->e_cpos);
2934 out:
2935         brelse(eb_bh);
2936         return ret;
2937 }
2938
2939 typedef int (xattr_bucket_func)(struct inode *inode,
2940                                 struct ocfs2_xattr_bucket *bucket,
2941                                 void *para);
2942
2943 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2944                                    struct ocfs2_xattr_bucket *bucket,
2945                                    int name_index,
2946                                    const char *name,
2947                                    u32 name_hash,
2948                                    u16 *xe_index,
2949                                    int *found)
2950 {
2951         int i, ret = 0, cmp = 1, block_off, new_offset;
2952         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
2953         size_t name_len = strlen(name);
2954         struct ocfs2_xattr_entry *xe = NULL;
2955         char *xe_name;
2956
2957         /*
2958          * We don't use binary search in the bucket because there
2959          * may be multiple entries with the same name hash.
2960          */
2961         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2962                 xe = &xh->xh_entries[i];
2963
2964                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2965                         continue;
2966                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2967                         break;
2968
2969                 cmp = name_index - ocfs2_xattr_get_type(xe);
2970                 if (!cmp)
2971                         cmp = name_len - xe->xe_name_len;
2972                 if (cmp)
2973                         continue;
2974
2975                 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
2976                                                         xh,
2977                                                         i,
2978                                                         &block_off,
2979                                                         &new_offset);
2980                 if (ret) {
2981                         mlog_errno(ret);
2982                         break;
2983                 }
2984
2985
2986                 xe_name = bucket_block(bucket, block_off) + new_offset;
2987                 if (!memcmp(name, xe_name, name_len)) {
2988                         *xe_index = i;
2989                         *found = 1;
2990                         ret = 0;
2991                         break;
2992                 }
2993         }
2994
2995         return ret;
2996 }
2997
2998 /*
2999  * Find the specified xattr entry in a series of buckets.
3000  * This series start from p_blkno and last for num_clusters.
3001  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3002  * the num of the valid buckets.
3003  *
3004  * Return the buffer_head this xattr should reside in. And if the xattr's
3005  * hash is in the gap of 2 buckets, return the lower bucket.
3006  */
3007 static int ocfs2_xattr_bucket_find(struct inode *inode,
3008                                    int name_index,
3009                                    const char *name,
3010                                    u32 name_hash,
3011                                    u64 p_blkno,
3012                                    u32 first_hash,
3013                                    u32 num_clusters,
3014                                    struct ocfs2_xattr_search *xs)
3015 {
3016         int ret, found = 0;
3017         struct ocfs2_xattr_header *xh = NULL;
3018         struct ocfs2_xattr_entry *xe = NULL;
3019         u16 index = 0;
3020         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3021         int low_bucket = 0, bucket, high_bucket;
3022         struct ocfs2_xattr_bucket *search;
3023         u32 last_hash;
3024         u64 blkno, lower_blkno = 0;
3025
3026         search = ocfs2_xattr_bucket_new(inode);
3027         if (!search) {
3028                 ret = -ENOMEM;
3029                 mlog_errno(ret);
3030                 goto out;
3031         }
3032
3033         ret = ocfs2_read_xattr_bucket(search, p_blkno);
3034         if (ret) {
3035                 mlog_errno(ret);
3036                 goto out;
3037         }
3038
3039         xh = bucket_xh(search);
3040         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3041         while (low_bucket <= high_bucket) {
3042                 ocfs2_xattr_bucket_relse(search);
3043
3044                 bucket = (low_bucket + high_bucket) / 2;
3045                 blkno = p_blkno + bucket * blk_per_bucket;
3046                 ret = ocfs2_read_xattr_bucket(search, blkno);
3047                 if (ret) {
3048                         mlog_errno(ret);
3049                         goto out;
3050                 }
3051
3052                 xh = bucket_xh(search);
3053                 xe = &xh->xh_entries[0];
3054                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3055                         high_bucket = bucket - 1;
3056                         continue;
3057                 }
3058
3059                 /*
3060                  * Check whether the hash of the last entry in our
3061                  * bucket is larger than the search one. for an empty
3062                  * bucket, the last one is also the first one.
3063                  */
3064                 if (xh->xh_count)
3065                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3066
3067                 last_hash = le32_to_cpu(xe->xe_name_hash);
3068
3069                 /* record lower_blkno which may be the insert place. */
3070                 lower_blkno = blkno;
3071
3072                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3073                         low_bucket = bucket + 1;
3074                         continue;
3075                 }
3076
3077                 /* the searched xattr should reside in this bucket if exists. */
3078                 ret = ocfs2_find_xe_in_bucket(inode, search,
3079                                               name_index, name, name_hash,
3080                                               &index, &found);
3081                 if (ret) {
3082                         mlog_errno(ret);
3083                         goto out;
3084                 }
3085                 break;
3086         }
3087
3088         /*
3089          * Record the bucket we have found.
3090          * When the xattr's hash value is in the gap of 2 buckets, we will
3091          * always set it to the previous bucket.
3092          */
3093         if (!lower_blkno)
3094                 lower_blkno = p_blkno;
3095
3096         /* This should be in cache - we just read it during the search */
3097         ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3098         if (ret) {
3099                 mlog_errno(ret);
3100                 goto out;
3101         }
3102
3103         xs->header = bucket_xh(xs->bucket);
3104         xs->base = bucket_block(xs->bucket, 0);
3105         xs->end = xs->base + inode->i_sb->s_blocksize;
3106
3107         if (found) {
3108                 xs->here = &xs->header->xh_entries[index];
3109                 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
3110                      (unsigned long long)bucket_blkno(xs->bucket), index);
3111         } else
3112                 ret = -ENODATA;
3113
3114 out:
3115         ocfs2_xattr_bucket_free(search);
3116         return ret;
3117 }
3118
3119 static int ocfs2_xattr_index_block_find(struct inode *inode,
3120                                         struct buffer_head *root_bh,
3121                                         int name_index,
3122                                         const char *name,
3123                                         struct ocfs2_xattr_search *xs)
3124 {
3125         int ret;
3126         struct ocfs2_xattr_block *xb =
3127                         (struct ocfs2_xattr_block *)root_bh->b_data;
3128         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3129         struct ocfs2_extent_list *el = &xb_root->xt_list;
3130         u64 p_blkno = 0;
3131         u32 first_hash, num_clusters = 0;
3132         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3133
3134         if (le16_to_cpu(el->l_next_free_rec) == 0)
3135                 return -ENODATA;
3136
3137         mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
3138              name, name_hash, name_index);
3139
3140         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3141                                   &num_clusters, el);
3142         if (ret) {
3143                 mlog_errno(ret);
3144                 goto out;
3145         }
3146
3147         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3148
3149         mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
3150              "in the rec is %u\n", num_clusters, (unsigned long long)p_blkno,
3151              first_hash);
3152
3153         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3154                                       p_blkno, first_hash, num_clusters, xs);
3155
3156 out:
3157         return ret;
3158 }
3159
3160 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3161                                        u64 blkno,
3162                                        u32 clusters,
3163                                        xattr_bucket_func *func,
3164                                        void *para)
3165 {
3166         int i, ret = 0;
3167         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3168         u32 num_buckets = clusters * bpc;
3169         struct ocfs2_xattr_bucket *bucket;
3170
3171         bucket = ocfs2_xattr_bucket_new(inode);
3172         if (!bucket) {
3173                 mlog_errno(-ENOMEM);
3174                 return -ENOMEM;
3175         }
3176
3177         mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
3178              clusters, (unsigned long long)blkno);
3179
3180         for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3181                 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3182                 if (ret) {
3183                         mlog_errno(ret);
3184                         break;
3185                 }
3186
3187                 /*
3188                  * The real bucket num in this series of blocks is stored
3189                  * in the 1st bucket.
3190                  */
3191                 if (i == 0)
3192                         num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3193
3194                 mlog(0, "iterating xattr bucket %llu, first hash %u\n",
3195                      (unsigned long long)blkno,
3196                      le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3197                 if (func) {
3198                         ret = func(inode, bucket, para);
3199                         if (ret && ret != -ERANGE)
3200                                 mlog_errno(ret);
3201                         /* Fall through to bucket_relse() */
3202                 }
3203
3204                 ocfs2_xattr_bucket_relse(bucket);
3205                 if (ret)
3206                         break;
3207         }
3208
3209         ocfs2_xattr_bucket_free(bucket);
3210         return ret;
3211 }
3212
3213 struct ocfs2_xattr_tree_list {
3214         char *buffer;
3215         size_t buffer_size;
3216         size_t result;
3217 };
3218
3219 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
3220                                              struct ocfs2_xattr_header *xh,
3221                                              int index,
3222                                              int *block_off,
3223                                              int *new_offset)
3224 {
3225         u16 name_offset;
3226
3227         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
3228                 return -EINVAL;
3229
3230         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
3231
3232         *block_off = name_offset >> sb->s_blocksize_bits;
3233         *new_offset = name_offset % sb->s_blocksize;
3234
3235         return 0;
3236 }
3237
3238 static int ocfs2_list_xattr_bucket(struct inode *inode,
3239                                    struct ocfs2_xattr_bucket *bucket,
3240                                    void *para)
3241 {
3242         int ret = 0, type;
3243         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
3244         int i, block_off, new_offset;
3245         const char *prefix, *name;
3246
3247         for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
3248                 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
3249                 type = ocfs2_xattr_get_type(entry);
3250                 prefix = ocfs2_xattr_prefix(type);
3251
3252                 if (prefix) {
3253                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3254                                                                 bucket_xh(bucket),
3255                                                                 i,
3256                                                                 &block_off,
3257                                                                 &new_offset);
3258                         if (ret)
3259                                 break;
3260
3261                         name = (const char *)bucket_block(bucket, block_off) +
3262                                 new_offset;
3263                         ret = ocfs2_xattr_list_entry(xl->buffer,
3264                                                      xl->buffer_size,
3265                                                      &xl->result,
3266                                                      prefix, name,
3267                                                      entry->xe_name_len);
3268                         if (ret)
3269                                 break;
3270                 }
3271         }
3272
3273         return ret;
3274 }
3275
3276 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
3277                                              struct ocfs2_xattr_tree_root *xt,
3278                                              char *buffer,
3279                                              size_t buffer_size)
3280 {
3281         struct ocfs2_extent_list *el = &xt->xt_list;
3282         int ret = 0;
3283         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
3284         u64 p_blkno = 0;
3285         struct ocfs2_xattr_tree_list xl = {
3286                 .buffer = buffer,
3287                 .buffer_size = buffer_size,
3288                 .result = 0,
3289         };
3290
3291         if (le16_to_cpu(el->l_next_free_rec) == 0)
3292                 return 0;
3293
3294         while (name_hash > 0) {
3295                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
3296                                           &e_cpos, &num_clusters, el);
3297                 if (ret) {
3298                         mlog_errno(ret);
3299                         goto out;
3300                 }
3301
3302                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
3303                                                   ocfs2_list_xattr_bucket,
3304                                                   &xl);
3305                 if (ret) {
3306                         if (ret != -ERANGE)
3307                                 mlog_errno(ret);
3308                         goto out;
3309                 }
3310
3311                 if (e_cpos == 0)
3312                         break;
3313
3314                 name_hash = e_cpos - 1;
3315         }
3316
3317         ret = xl.result;
3318 out:
3319         return ret;
3320 }
3321
3322 static int cmp_xe(const void *a, const void *b)
3323 {
3324         const struct ocfs2_xattr_entry *l = a, *r = b;
3325         u32 l_hash = le32_to_cpu(l->xe_name_hash);
3326         u32 r_hash = le32_to_cpu(r->xe_name_hash);
3327
3328         if (l_hash > r_hash)
3329                 return 1;
3330         if (l_hash < r_hash)
3331                 return -1;
3332         return 0;
3333 }
3334
3335 static void swap_xe(void *a, void *b, int size)
3336 {
3337         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
3338
3339         tmp = *l;
3340         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
3341         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
3342 }
3343
3344 /*
3345  * When the ocfs2_xattr_block is filled up, new bucket will be created
3346  * and all the xattr entries will be moved to the new bucket.
3347  * The header goes at the start of the bucket, and the names+values are
3348  * filled from the end.  This is why *target starts as the last buffer.
3349  * Note: we need to sort the entries since they are not saved in order
3350  * in the ocfs2_xattr_block.
3351  */
3352 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
3353                                            struct buffer_head *xb_bh,
3354                                            struct ocfs2_xattr_bucket *bucket)
3355 {
3356         int i, blocksize = inode->i_sb->s_blocksize;
3357         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3358         u16 offset, size, off_change;
3359         struct ocfs2_xattr_entry *xe;
3360         struct ocfs2_xattr_block *xb =
3361                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
3362         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
3363         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3364         u16 count = le16_to_cpu(xb_xh->xh_count);
3365         char *src = xb_bh->b_data;
3366         char *target = bucket_block(bucket, blks - 1);
3367
3368         mlog(0, "cp xattr from block %llu to bucket %llu\n",
3369              (unsigned long long)xb_bh->b_blocknr,
3370              (unsigned long long)bucket_blkno(bucket));
3371
3372         for (i = 0; i < blks; i++)
3373                 memset(bucket_block(bucket, i), 0, blocksize);
3374
3375         /*
3376          * Since the xe_name_offset is based on ocfs2_xattr_header,
3377          * there is a offset change corresponding to the change of
3378          * ocfs2_xattr_header's position.
3379          */
3380         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3381         xe = &xb_xh->xh_entries[count - 1];
3382         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
3383         size = blocksize - offset;
3384
3385         /* copy all the names and values. */
3386         memcpy(target + offset, src + offset, size);
3387
3388         /* Init new header now. */
3389         xh->xh_count = xb_xh->xh_count;
3390         xh->xh_num_buckets = cpu_to_le16(1);
3391         xh->xh_name_value_len = cpu_to_le16(size);
3392         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
3393
3394         /* copy all the entries. */
3395         target = bucket_block(bucket, 0);
3396         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
3397         size = count * sizeof(struct ocfs2_xattr_entry);
3398         memcpy(target + offset, (char *)xb_xh + offset, size);
3399
3400         /* Change the xe offset for all the xe because of the move. */
3401         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
3402                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3403         for (i = 0; i < count; i++)
3404                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
3405
3406         mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
3407              offset, size, off_change);
3408
3409         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
3410              cmp_xe, swap_xe);
3411 }
3412
3413 /*
3414  * After we move xattr from block to index btree, we have to
3415  * update ocfs2_xattr_search to the new xe and base.
3416  *
3417  * When the entry is in xattr block, xattr_bh indicates the storage place.
3418  * While if the entry is in index b-tree, "bucket" indicates the
3419  * real place of the xattr.
3420  */
3421 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
3422                                             struct ocfs2_xattr_search *xs,
3423                                             struct buffer_head *old_bh)
3424 {
3425         char *buf = old_bh->b_data;
3426         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
3427         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
3428         int i;
3429
3430         xs->header = bucket_xh(xs->bucket);
3431         xs->base = bucket_block(xs->bucket, 0);
3432         xs->end = xs->base + inode->i_sb->s_blocksize;
3433
3434         if (xs->not_found)
3435                 return;
3436
3437         i = xs->here - old_xh->xh_entries;
3438         xs->here = &xs->header->xh_entries[i];
3439 }
3440
3441 static int ocfs2_xattr_create_index_block(struct inode *inode,
3442                                           struct ocfs2_xattr_search *xs,
3443                                           struct ocfs2_xattr_set_ctxt *ctxt)
3444 {
3445         int ret;
3446         u32 bit_off, len;
3447         u64 blkno;
3448         handle_t *handle = ctxt->handle;
3449         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3450         struct ocfs2_inode_info *oi = OCFS2_I(inode);
3451         struct buffer_head *xb_bh = xs->xattr_bh;
3452         struct ocfs2_xattr_block *xb =
3453                         (struct ocfs2_xattr_block *)xb_bh->b_data;
3454         struct ocfs2_xattr_tree_root *xr;
3455         u16 xb_flags = le16_to_cpu(xb->xb_flags);
3456
3457         mlog(0, "create xattr index block for %llu\n",
3458              (unsigned long long)xb_bh->b_blocknr);
3459
3460         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
3461         BUG_ON(!xs->bucket);
3462
3463         /*
3464          * XXX:
3465          * We can use this lock for now, and maybe move to a dedicated mutex
3466          * if performance becomes a problem later.
3467          */
3468         down_write(&oi->ip_alloc_sem);
3469
3470         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
3471                                       OCFS2_JOURNAL_ACCESS_WRITE);
3472         if (ret) {
3473                 mlog_errno(ret);
3474                 goto out;
3475         }
3476
3477         ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac,
3478                                      1, 1, &bit_off, &len);
3479         if (ret) {
3480                 mlog_errno(ret);
3481                 goto out;
3482         }
3483
3484         /*
3485          * The bucket may spread in many blocks, and
3486          * we will only touch the 1st block and the last block
3487          * in the whole bucket(one for entry and one for data).
3488          */
3489         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
3490
3491         mlog(0, "allocate 1 cluster from %llu to xattr block\n",
3492              (unsigned long long)blkno);
3493
3494         ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
3495         if (ret) {
3496                 mlog_errno(ret);
3497                 goto out;
3498         }
3499
3500         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
3501                                                 OCFS2_JOURNAL_ACCESS_CREATE);
3502         if (ret) {
3503                 mlog_errno(ret);
3504                 goto out;
3505         }
3506
3507         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
3508         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
3509
3510         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
3511
3512         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
3513         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
3514                offsetof(struct ocfs2_xattr_block, xb_attrs));
3515
3516         xr = &xb->xb_attrs.xb_root;
3517         xr->xt_clusters = cpu_to_le32(1);
3518         xr->xt_last_eb_blk = 0;
3519         xr->xt_list.l_tree_depth = 0;
3520         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
3521         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
3522
3523         xr->xt_list.l_recs[0].e_cpos = 0;
3524         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
3525         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
3526
3527         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
3528
3529         ocfs2_journal_dirty(handle, xb_bh);
3530
3531 out:
3532         up_write(&oi->ip_alloc_sem);
3533
3534         return ret;
3535 }
3536
3537 static int cmp_xe_offset(const void *a, const void *b)
3538 {
3539         const struct ocfs2_xattr_entry *l = a, *r = b;
3540         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
3541         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
3542
3543         if (l_name_offset < r_name_offset)
3544                 return 1;
3545         if (l_name_offset > r_name_offset)
3546                 return -1;
3547         return 0;
3548 }
3549
3550 /*
3551  * defrag a xattr bucket if we find that the bucket has some
3552  * holes beteen name/value pairs.
3553  * We will move all the name/value pairs to the end of the bucket
3554  * so that we can spare some space for insertion.
3555  */
3556 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
3557                                      handle_t *handle,
3558                                      struct ocfs2_xattr_bucket *bucket)
3559 {
3560         int ret, i;
3561         size_t end, offset, len, value_len;
3562         struct ocfs2_xattr_header *xh;
3563         char *entries, *buf, *bucket_buf = NULL;
3564         u64 blkno = bucket_blkno(bucket);
3565         u16 xh_free_start;
3566         size_t blocksize = inode->i_sb->s_blocksize;
3567         struct ocfs2_xattr_entry *xe;
3568
3569         /*
3570          * In order to make the operation more efficient and generic,
3571          * we copy all the blocks into a contiguous memory and do the
3572          * defragment there, so if anything is error, we will not touch
3573          * the real block.
3574          */
3575         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
3576         if (!bucket_buf) {
3577                 ret = -EIO;
3578                 goto out;
3579         }
3580
3581         buf = bucket_buf;
3582         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3583                 memcpy(buf, bucket_block(bucket, i), blocksize);
3584
3585         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
3586                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3587         if (ret < 0) {
3588                 mlog_errno(ret);
3589                 goto out;
3590         }
3591
3592         xh = (struct ocfs2_xattr_header *)bucket_buf;
3593         entries = (char *)xh->xh_entries;
3594         xh_free_start = le16_to_cpu(xh->xh_free_start);
3595
3596         mlog(0, "adjust xattr bucket in %llu, count = %u, "
3597              "xh_free_start = %u, xh_name_value_len = %u.\n",
3598              (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
3599              xh_free_start, le16_to_cpu(xh->xh_name_value_len));
3600
3601         /*
3602          * sort all the entries by their offset.
3603          * the largest will be the first, so that we can
3604          * move them to the end one by one.
3605          */
3606         sort(entries, le16_to_cpu(xh->xh_count),
3607              sizeof(struct ocfs2_xattr_entry),
3608              cmp_xe_offset, swap_xe);
3609
3610         /* Move all name/values to the end of the bucket. */
3611         xe = xh->xh_entries;
3612         end = OCFS2_XATTR_BUCKET_SIZE;
3613         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
3614                 offset = le16_to_cpu(xe->xe_name_offset);
3615                 if (ocfs2_xattr_is_local(xe))
3616                         value_len = OCFS2_XATTR_SIZE(
3617                                         le64_to_cpu(xe->xe_value_size));
3618                 else
3619                         value_len = OCFS2_XATTR_ROOT_SIZE;
3620                 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
3621
3622                 /*
3623                  * We must make sure that the name/value pair
3624                  * exist in the same block. So adjust end to
3625                  * the previous block end if needed.
3626                  */
3627                 if (((end - len) / blocksize !=
3628                         (end - 1) / blocksize))
3629                         end = end - end % blocksize;
3630
3631                 if (end > offset + len) {
3632                         memmove(bucket_buf + end - len,
3633                                 bucket_buf + offset, len);
3634                         xe->xe_name_offset = cpu_to_le16(end - len);
3635                 }
3636
3637                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
3638                                 "bucket %llu\n", (unsigned long long)blkno);
3639
3640                 end -= len;
3641         }
3642
3643         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
3644                         "bucket %llu\n", (unsigned long long)blkno);
3645
3646         if (xh_free_start == end)
3647                 goto out;
3648
3649         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
3650         xh->xh_free_start = cpu_to_le16(end);
3651
3652         /* sort the entries by their name_hash. */
3653         sort(entries, le16_to_cpu(xh->xh_count),
3654              sizeof(struct ocfs2_xattr_entry),
3655              cmp_xe, swap_xe);
3656
3657         buf = bucket_buf;
3658         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3659                 memcpy(bucket_block(bucket, i), buf, blocksize);
3660         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
3661
3662 out:
3663         kfree(bucket_buf);
3664         return ret;
3665 }
3666
3667 /*
3668  * prev_blkno points to the start of an existing extent.  new_blkno
3669  * points to a newly allocated extent.  Because we know each of our
3670  * clusters contains more than bucket, we can easily split one cluster
3671  * at a bucket boundary.  So we take the last cluster of the existing
3672  * extent and split it down the middle.  We move the last half of the
3673  * buckets in the last cluster of the existing extent over to the new
3674  * extent.
3675  *
3676  * first_bh is the buffer at prev_blkno so we can update the existing
3677  * extent's bucket count.  header_bh is the bucket were we were hoping
3678  * to insert our xattr.  If the bucket move places the target in the new
3679  * extent, we'll update first_bh and header_bh after modifying the old
3680  * extent.
3681  *
3682  * first_hash will be set as the 1st xe's name_hash in the new extent.
3683  */
3684 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3685                                                handle_t *handle,
3686                                                struct ocfs2_xattr_bucket *first,
3687                                                struct ocfs2_xattr_bucket *target,
3688                                                u64 new_blkno,
3689                                                u32 num_clusters,
3690                                                u32 *first_hash)
3691 {
3692         int ret;
3693         struct super_block *sb = inode->i_sb;
3694         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
3695         int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
3696         int to_move = num_buckets / 2;
3697         u64 src_blkno;
3698         u64 last_cluster_blkno = bucket_blkno(first) +
3699                 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
3700
3701         BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
3702         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
3703
3704         mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3705              (unsigned long long)last_cluster_blkno, (unsigned long long)new_blkno);
3706
3707         ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
3708                                      last_cluster_blkno, new_blkno,
3709                                      to_move, first_hash);
3710         if (ret) {
3711                 mlog_errno(ret);
3712                 goto out;
3713         }
3714
3715         /* This is the first bucket that got moved */
3716         src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
3717
3718         /*
3719          * If the target bucket was part of the moved buckets, we need to
3720          * update first and target.
3721          */
3722         if (bucket_blkno(target) >= src_blkno) {
3723                 /* Find the block for the new target bucket */
3724                 src_blkno = new_blkno +
3725                         (bucket_blkno(target) - src_blkno);
3726
3727                 ocfs2_xattr_bucket_relse(first);
3728                 ocfs2_xattr_bucket_relse(target);
3729
3730                 /*
3731                  * These shouldn't fail - the buffers are in the
3732                  * journal from ocfs2_cp_xattr_bucket().
3733                  */
3734                 ret = ocfs2_read_xattr_bucket(first, new_blkno);
3735                 if (ret) {
3736                         mlog_errno(ret);
3737                         goto out;
3738                 }
3739                 ret = ocfs2_read_xattr_bucket(target, src_blkno);
3740                 if (ret)
3741                         mlog_errno(ret);
3742
3743         }
3744
3745 out:
3746         return ret;
3747 }
3748
3749 /*
3750  * Find the suitable pos when we divide a bucket into 2.
3751  * We have to make sure the xattrs with the same hash value exist
3752  * in the same bucket.
3753  *
3754  * If this ocfs2_xattr_header covers more than one hash value, find a
3755  * place where the hash value changes.  Try to find the most even split.
3756  * The most common case is that all entries have different hash values,
3757  * and the first check we make will find a place to split.
3758  */
3759 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
3760 {
3761         struct ocfs2_xattr_entry *entries = xh->xh_entries;
3762         int count = le16_to_cpu(xh->xh_count);
3763         int delta, middle = count / 2;
3764
3765         /*
3766          * We start at the middle.  Each step gets farther away in both
3767          * directions.  We therefore hit the change in hash value
3768          * nearest to the middle.  Note that this loop does not execute for
3769          * count < 2.
3770          */
3771         for (delta = 0; delta < middle; delta++) {
3772                 /* Let's check delta earlier than middle */
3773                 if (cmp_xe(&entries[middle - delta - 1],
3774                            &entries[middle - delta]))
3775                         return middle - delta;
3776
3777                 /* For even counts, don't walk off the end */
3778                 if ((middle + delta + 1) == count)
3779                         continue;
3780
3781                 /* Now try delta past middle */
3782                 if (cmp_xe(&entries[middle + delta],
3783                            &entries[middle + delta + 1]))
3784                         return middle + delta + 1;
3785         }
3786
3787         /* Every entry had the same hash */
3788         return count;
3789 }
3790
3791 /*
3792  * Move some xattrs in old bucket(blk) to new bucket(new_blk).
3793  * first_hash will record the 1st hash of the new bucket.
3794  *
3795  * Normally half of the xattrs will be moved.  But we have to make
3796  * sure that the xattrs with the same hash value are stored in the
3797  * same bucket. If all the xattrs in this bucket have the same hash
3798  * value, the new bucket will be initialized as an empty one and the
3799  * first_hash will be initialized as (hash_value+1).
3800  */
3801 static int ocfs2_divide_xattr_bucket(struct inode *inode,
3802                                     handle_t *handle,
3803                                     u64 blk,
3804                                     u64 new_blk,
3805                                     u32 *first_hash,
3806                                     int new_bucket_head)
3807 {
3808         int ret, i;
3809         int count, start, len, name_value_len = 0, xe_len, name_offset = 0;
3810         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
3811         struct ocfs2_xattr_header *xh;
3812         struct ocfs2_xattr_entry *xe;
3813         int blocksize = inode->i_sb->s_blocksize;
3814
3815         mlog(0, "move some of xattrs from bucket %llu to %llu\n",
3816              (unsigned long long)blk, (unsigned long long)new_blk);
3817
3818         s_bucket = ocfs2_xattr_bucket_new(inode);
3819         t_bucket = ocfs2_xattr_bucket_new(inode);
3820         if (!s_bucket || !t_bucket) {
3821                 ret = -ENOMEM;
3822                 mlog_errno(ret);
3823                 goto out;
3824         }
3825
3826         ret = ocfs2_read_xattr_bucket(s_bucket, blk);
3827         if (ret) {
3828                 mlog_errno(ret);
3829                 goto out;
3830         }
3831
3832         ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
3833                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3834         if (ret) {
3835                 mlog_errno(ret);
3836                 goto out;
3837         }
3838
3839         /*
3840          * Even if !new_bucket_head, we're overwriting t_bucket.  Thus,
3841          * there's no need to read it.
3842          */
3843         ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
3844         if (ret) {
3845                 mlog_errno(ret);
3846                 goto out;
3847         }
3848
3849         /*
3850          * Hey, if we're overwriting t_bucket, what difference does
3851          * ACCESS_CREATE vs ACCESS_WRITE make?  See the comment in the
3852          * same part of ocfs2_cp_xattr_bucket().
3853          */
3854         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
3855                                                 new_bucket_head ?
3856                                                 OCFS2_JOURNAL_ACCESS_CREATE :
3857                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3858         if (ret) {
3859                 mlog_errno(ret);
3860                 goto out;
3861         }
3862
3863         xh = bucket_xh(s_bucket);
3864         count = le16_to_cpu(xh->xh_count);
3865         start = ocfs2_xattr_find_divide_pos(xh);
3866
3867         if (start == count) {
3868                 xe = &xh->xh_entries[start-1];
3869
3870                 /*
3871                  * initialized a new empty bucket here.
3872                  * The hash value is set as one larger than
3873                  * that of the last entry in the previous bucket.
3874                  */
3875                 for (i = 0; i < t_bucket->bu_blocks; i++)
3876                         memset(bucket_block(t_bucket, i), 0, blocksize);
3877
3878                 xh = bucket_xh(t_bucket);
3879                 xh->xh_free_start = cpu_to_le16(blocksize);
3880                 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
3881                 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
3882
3883                 goto set_num_buckets;
3884         }
3885
3886         /* copy the whole bucket to the new first. */
3887         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
3888
3889         /* update the new bucket. */
3890         xh = bucket_xh(t_bucket);
3891
3892         /*
3893          * Calculate the total name/value len and xh_free_start for
3894          * the old bucket first.
3895          */
3896         name_offset = OCFS2_XATTR_BUCKET_SIZE;
3897         name_value_len = 0;
3898         for (i = 0; i < start; i++) {
3899                 xe = &xh->xh_entries[i];
3900                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3901                 if (ocfs2_xattr_is_local(xe))
3902                         xe_len +=
3903                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3904                 else
3905                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3906                 name_value_len += xe_len;
3907                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3908                         name_offset = le16_to_cpu(xe->xe_name_offset);
3909         }
3910
3911         /*
3912          * Now begin the modification to the new bucket.
3913          *
3914          * In the new bucket, We just move the xattr entry to the beginning
3915          * and don't touch the name/value. So there will be some holes in the
3916          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3917          * called.
3918          */
3919         xe = &xh->xh_entries[start];
3920         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3921         mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3922              (int)((char *)xe - (char *)xh),
3923              (int)((char *)xh->xh_entries - (char *)xh));
3924         memmove((char *)xh->xh_entries, (char *)xe, len);
3925         xe = &xh->xh_entries[count - start];
3926         len = sizeof(struct ocfs2_xattr_entry) * start;
3927         memset((char *)xe, 0, len);
3928
3929         le16_add_cpu(&xh->xh_count, -start);
3930         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3931
3932         /* Calculate xh_free_start for the new bucket. */
3933         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3934         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3935                 xe = &xh->xh_entries[i];
3936                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3937                 if (ocfs2_xattr_is_local(xe))
3938                         xe_len +=
3939                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3940                 else
3941                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3942                 if (le16_to_cpu(xe->xe_name_offset) <
3943                     le16_to_cpu(xh->xh_free_start))
3944                         xh->xh_free_start = xe->xe_name_offset;
3945         }
3946
3947 set_num_buckets:
3948         /* set xh->xh_num_buckets for the new xh. */
3949         if (new_bucket_head)
3950                 xh->xh_num_buckets = cpu_to_le16(1);
3951         else
3952                 xh->xh_num_buckets = 0;
3953
3954         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
3955
3956         /* store the first_hash of the new bucket. */
3957         if (first_hash)
3958                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3959
3960         /*
3961          * Now only update the 1st block of the old bucket.  If we
3962          * just added a new empty bucket, there is no need to modify
3963          * it.
3964          */
3965         if (start == count)
3966                 goto out;
3967
3968         xh = bucket_xh(s_bucket);
3969         memset(&xh->xh_entries[start], 0,
3970                sizeof(struct ocfs2_xattr_entry) * (count - start));
3971         xh->xh_count = cpu_to_le16(start);
3972         xh->xh_free_start = cpu_to_le16(name_offset);
3973         xh->xh_name_value_len = cpu_to_le16(name_value_len);
3974
3975         ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
3976
3977 out:
3978         ocfs2_xattr_bucket_free(s_bucket);
3979         ocfs2_xattr_bucket_free(t_bucket);
3980
3981         return ret;
3982 }
3983
3984 /*
3985  * Copy xattr from one bucket to another bucket.
3986  *
3987  * The caller must make sure that the journal transaction
3988  * has enough space for journaling.
3989  */
3990 static int ocfs2_cp_xattr_bucket(struct inode *inode,
3991                                  handle_t *handle,
3992                                  u64 s_blkno,
3993                                  u64 t_blkno,
3994                                  int t_is_new)
3995 {
3996         int ret;
3997         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
3998
3999         BUG_ON(s_blkno == t_blkno);
4000
4001         mlog(0, "cp bucket %llu to %llu, target is %d\n",
4002              (unsigned long long)s_blkno, (unsigned long long)t_blkno,
4003              t_is_new);
4004
4005         s_bucket = ocfs2_xattr_bucket_new(inode);
4006         t_bucket = ocfs2_xattr_bucket_new(inode);
4007         if (!s_bucket || !t_bucket) {
4008                 ret = -ENOMEM;
4009                 mlog_errno(ret);
4010                 goto out;
4011         }
4012
4013         ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4014         if (ret)
4015                 goto out;
4016
4017         /*
4018          * Even if !t_is_new, we're overwriting t_bucket.  Thus,
4019          * there's no need to read it.
4020          */
4021         ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4022         if (ret)
4023                 goto out;
4024
4025         /*
4026          * Hey, if we're overwriting t_bucket, what difference does
4027          * ACCESS_CREATE vs ACCESS_WRITE make?  Well, if we allocated a new
4028          * cluster to fill, we came here from
4029          * ocfs2_mv_xattr_buckets(), and it is really new -
4030          * ACCESS_CREATE is required.  But we also might have moved data
4031          * out of t_bucket before extending back into it.
4032          * ocfs2_add_new_xattr_bucket() can do this - its call to
4033          * ocfs2_add_new_xattr_cluster() may have created a new extent
4034          * and copied out the end of the old extent.  Then it re-extends
4035          * the old extent back to create space for new xattrs.  That's
4036          * how we get here, and the bucket isn't really new.
4037          */
4038         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4039                                                 t_is_new ?
4040                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4041                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4042         if (ret)
4043                 goto out;
4044
4045         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4046         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4047
4048 out:
4049         ocfs2_xattr_bucket_free(t_bucket);
4050         ocfs2_xattr_bucket_free(s_bucket);
4051
4052         return ret;
4053 }
4054
4055 /*
4056  * src_blk points to the start of an existing extent.  last_blk points to
4057  * last cluster in that extent.  to_blk points to a newly allocated
4058  * extent.  We copy the buckets from the cluster at last_blk to the new
4059  * extent.  If start_bucket is non-zero, we skip that many buckets before
4060  * we start copying.  The new extent's xh_num_buckets gets set to the
4061  * number of buckets we copied.  The old extent's xh_num_buckets shrinks
4062  * by the same amount.
4063  */
4064 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4065                                   u64 src_blk, u64 last_blk, u64 to_blk,
4066                                   unsigned int start_bucket,
4067                                   u32 *first_hash)
4068 {
4069         int i, ret, credits;
4070         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4071         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4072         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4073         struct ocfs2_xattr_bucket *old_first, *new_first;
4074
4075         mlog(0, "mv xattrs from cluster %llu to %llu\n",
4076              (unsigned long long)last_blk, (unsigned long long)to_blk);
4077
4078         BUG_ON(start_bucket >= num_buckets);
4079         if (start_bucket) {
4080                 num_buckets -= start_bucket;
4081                 last_blk += (start_bucket * blks_per_bucket);
4082         }
4083
4084         /* The first bucket of the original extent */
4085         old_first = ocfs2_xattr_bucket_new(inode);
4086         /* The first bucket of the new extent */
4087         new_first = ocfs2_xattr_bucket_new(inode);
4088         if (!old_first || !new_first) {
4089                 ret = -ENOMEM;
4090                 mlog_errno(ret);
4091                 goto out;
4092         }
4093
4094         ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4095         if (ret) {
4096                 mlog_errno(ret);
4097                 goto out;
4098         }
4099
4100         /*
4101          * We need to update the first bucket of the old extent and all
4102          * the buckets going to the new extent.
4103          */
4104         credits = ((num_buckets + 1) * blks_per_bucket) +
4105                 handle->h_buffer_credits;
4106         ret = ocfs2_extend_trans(handle, credits);
4107         if (ret) {
4108                 mlog_errno(ret);
4109                 goto out;
4110         }
4111
4112         ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4113                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4114         if (ret) {
4115                 mlog_errno(ret);
4116                 goto out;
4117         }
4118
4119         for (i = 0; i < num_buckets; i++) {
4120                 ret = ocfs2_cp_xattr_bucket(inode, handle,
4121                                             last_blk + (i * blks_per_bucket),
4122                                             to_blk + (i * blks_per_bucket),
4123                                             1);
4124                 if (ret) {
4125                         mlog_errno(ret);
4126                         goto out;
4127                 }
4128         }
4129
4130         /*
4131          * Get the new bucket ready before we dirty anything
4132          * (This actually shouldn't fail, because we already dirtied
4133          * it once in ocfs2_cp_xattr_bucket()).
4134          */
4135         ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4136         if (ret) {
4137                 mlog_errno(ret);
4138                 goto out;
4139         }
4140         ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4141                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4142         if (ret) {
4143                 mlog_errno(ret);
4144                 goto out;
4145         }
4146
4147         /* Now update the headers */
4148         le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4149         ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4150
4151         bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4152         ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4153
4154         if (first_hash)
4155                 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4156
4157 out:
4158         ocfs2_xattr_bucket_free(new_first);
4159         ocfs2_xattr_bucket_free(old_first);
4160         return ret;
4161 }
4162
4163 /*
4164  * Move some xattrs in this cluster to the new cluster.
4165  * This function should only be called when bucket size == cluster size.
4166  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4167  */
4168 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4169                                       handle_t *handle,
4170                                       u64 prev_blk,
4171                                       u64 new_blk,
4172                                       u32 *first_hash)
4173 {
4174         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4175         int ret, credits = 2 * blk_per_bucket + handle->h_buffer_credits;
4176
4177         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4178
4179         ret = ocfs2_extend_trans(handle, credits);
4180         if (ret) {
4181                 mlog_errno(ret);
4182                 return ret;
4183         }
4184
4185         /* Move half of the xattr in start_blk to the next bucket. */
4186         return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4187                                           new_blk, first_hash, 1);
4188 }
4189
4190 /*
4191  * Move some xattrs from the old cluster to the new one since they are not
4192  * contiguous in ocfs2 xattr tree.
4193  *
4194  * new_blk starts a new separate cluster, and we will move some xattrs from
4195  * prev_blk to it. v_start will be set as the first name hash value in this
4196  * new cluster so that it can be used as e_cpos during tree insertion and
4197  * don't collide with our original b-tree operations. first_bh and header_bh
4198  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4199  * to extend the insert bucket.
4200  *
4201  * The problem is how much xattr should we move to the new one and when should
4202  * we update first_bh and header_bh?
4203  * 1. If cluster size > bucket size, that means the previous cluster has more
4204  *    than 1 bucket, so just move half nums of bucket into the new cluster and
4205  *    update the first_bh and header_bh if the insert bucket has been moved
4206  *    to the new cluster.
4207  * 2. If cluster_size == bucket_size:
4208  *    a) If the previous extent rec has more than one cluster and the insert
4209  *       place isn't in the last cluster, copy the entire last cluster to the
4210  *       new one. This time, we don't need to upate the first_bh and header_bh
4211  *       since they will not be moved into the new cluster.
4212  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
4213  *       the new one. And we set the extend flag to zero if the insert place is
4214  *       moved into the new allocated cluster since no extend is needed.
4215  */
4216 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
4217                                             handle_t *handle,
4218                                             struct ocfs2_xattr_bucket *first,
4219                                             struct ocfs2_xattr_bucket *target,
4220                                             u64 new_blk,
4221                                             u32 prev_clusters,
4222                                             u32 *v_start,
4223                                             int *extend)
4224 {
4225         int ret;
4226
4227         mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
4228              (unsigned long long)bucket_blkno(first), prev_clusters,
4229              (unsigned long long)new_blk);
4230
4231         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
4232                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
4233                                                           handle,
4234                                                           first, target,
4235                                                           new_blk,
4236                                                           prev_clusters,
4237                                                           v_start);
4238                 if (ret)
4239                         mlog_errno(ret);
4240         } else {
4241                 /* The start of the last cluster in the first extent */
4242                 u64 last_blk = bucket_blkno(first) +
4243                         ((prev_clusters - 1) *
4244                          ocfs2_clusters_to_blocks(inode->i_sb, 1));
4245
4246                 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
4247                         ret = ocfs2_mv_xattr_buckets(inode, handle,
4248                                                      bucket_blkno(first),
4249                                                      last_blk, new_blk, 0,
4250                                                      v_start);
4251                         if (ret)
4252                                 mlog_errno(ret);
4253                 } else {
4254                         ret = ocfs2_divide_xattr_cluster(inode, handle,
4255                                                          last_blk, new_blk,
4256                                                          v_start);
4257                         if (ret)
4258                                 mlog_errno(ret);
4259
4260                         if ((bucket_blkno(target) == last_blk) && extend)
4261                                 *extend = 0;
4262                 }
4263         }
4264
4265         return ret;
4266 }
4267
4268 /*
4269  * Add a new cluster for xattr storage.
4270  *
4271  * If the new cluster is contiguous with the previous one, it will be
4272  * appended to the same extent record, and num_clusters will be updated.
4273  * If not, we will insert a new extent for it and move some xattrs in
4274  * the last cluster into the new allocated one.
4275  * We also need to limit the maximum size of a btree leaf, otherwise we'll
4276  * lose the benefits of hashing because we'll have to search large leaves.
4277  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
4278  * if it's bigger).
4279  *
4280  * first_bh is the first block of the previous extent rec and header_bh
4281  * indicates the bucket we will insert the new xattrs. They will be updated
4282  * when the header_bh is moved into the new cluster.
4283  */
4284 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
4285                                        struct buffer_head *root_bh,
4286                                        struct ocfs2_xattr_bucket *first,
4287                                        struct ocfs2_xattr_bucket *target,
4288                                        u32 *num_clusters,
4289                                        u32 prev_cpos,
4290                                        int *extend,
4291                                        struct ocfs2_xattr_set_ctxt *ctxt)
4292 {
4293         int ret;
4294         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
4295         u32 prev_clusters = *num_clusters;
4296         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
4297         u64 block;
4298         handle_t *handle = ctxt->handle;
4299         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4300         struct ocfs2_extent_tree et;
4301
4302         mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
4303              "previous xattr blkno = %llu\n",
4304              (unsigned long long)OCFS2_I(inode)->ip_blkno,
4305              prev_cpos, (unsigned long long)bucket_blkno(first));
4306
4307         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
4308
4309         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
4310                                       OCFS2_JOURNAL_ACCESS_WRITE);
4311         if (ret < 0) {
4312                 mlog_errno(ret);
4313                 goto leave;
4314         }
4315
4316         ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac, 1,
4317                                      clusters_to_add, &bit_off, &num_bits);
4318         if (ret < 0) {
4319                 if (ret != -ENOSPC)
4320                         mlog_errno(ret);
4321                 goto leave;
4322         }
4323
4324         BUG_ON(num_bits > clusters_to_add);
4325
4326         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
4327         mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
4328              num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
4329
4330         if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
4331             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
4332              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
4333                 /*
4334                  * If this cluster is contiguous with the old one and
4335                  * adding this new cluster, we don't surpass the limit of
4336                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
4337                  * initialized and used like other buckets in the previous
4338                  * cluster.
4339                  * So add it as a contiguous one. The caller will handle
4340                  * its init process.
4341                  */
4342                 v_start = prev_cpos + prev_clusters;
4343                 *num_clusters = prev_clusters + num_bits;
4344                 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
4345                      num_bits);
4346         } else {
4347                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
4348                                                        handle,
4349                                                        first,
4350                                                        target,
4351                                                        block,
4352                                                        prev_clusters,
4353                                                        &v_start,
4354                                                        extend);
4355                 if (ret) {
4356                         mlog_errno(ret);
4357                         goto leave;
4358                 }
4359         }
4360
4361         mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
4362              num_bits, (unsigned long long)block, v_start);
4363         ret = ocfs2_insert_extent(handle, &et, v_start, block,
4364                                   num_bits, 0, ctxt->meta_ac);
4365         if (ret < 0) {
4366                 mlog_errno(ret);
4367                 goto leave;
4368         }
4369
4370         ret = ocfs2_journal_dirty(handle, root_bh);
4371         if (ret < 0)
4372                 mlog_errno(ret);
4373
4374 leave:
4375         return ret;
4376 }
4377
4378 /*
4379  * We are given an extent.  'first' is the bucket at the very front of
4380  * the extent.  The extent has space for an additional bucket past
4381  * bucket_xh(first)->xh_num_buckets.  'target_blkno' is the block number
4382  * of the target bucket.  We wish to shift every bucket past the target
4383  * down one, filling in that additional space.  When we get back to the
4384  * target, we split the target between itself and the now-empty bucket
4385  * at target+1 (aka, target_blkno + blks_per_bucket).
4386  */
4387 static int ocfs2_extend_xattr_bucket(struct inode *inode,
4388                                      handle_t *handle,
4389                                      struct ocfs2_xattr_bucket *first,
4390                                      u64 target_blk,
4391                                      u32 num_clusters)
4392 {
4393         int ret, credits;
4394         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4395         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4396         u64 end_blk;
4397         u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
4398
4399         mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
4400              "from %llu, len = %u\n", (unsigned long long)target_blk,
4401              (unsigned long long)bucket_blkno(first), num_clusters);
4402
4403         /* The extent must have room for an additional bucket */
4404         BUG_ON(new_bucket >=
4405                (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
4406
4407         /* end_blk points to the last existing bucket */
4408         end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
4409
4410         /*
4411          * end_blk is the start of the last existing bucket.
4412          * Thus, (end_blk - target_blk) covers the target bucket and
4413          * every bucket after it up to, but not including, the last
4414          * existing bucket.  Then we add the last existing bucket, the
4415          * new bucket, and the first bucket (3 * blk_per_bucket).
4416          */
4417         credits = (end_blk - target_blk) + (3 * blk_per_bucket) +
4418                   handle->h_buffer_credits;
4419         ret = ocfs2_extend_trans(handle, credits);
4420         if (ret) {
4421                 mlog_errno(ret);
4422                 goto out;
4423         }
4424
4425         ret = ocfs2_xattr_bucket_journal_access(handle, first,
4426                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4427         if (ret) {
4428                 mlog_errno(ret);
4429                 goto out;
4430         }
4431
4432         while (end_blk != target_blk) {
4433                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
4434                                             end_blk + blk_per_bucket, 0);
4435                 if (ret)
4436                         goto out;
4437                 end_blk -= blk_per_bucket;
4438         }
4439
4440         /* Move half of the xattr in target_blkno to the next bucket. */
4441         ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
4442                                         target_blk + blk_per_bucket, NULL, 0);
4443
4444         le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
4445         ocfs2_xattr_bucket_journal_dirty(handle, first);
4446
4447 out:
4448         return ret;
4449 }
4450
4451 /*
4452  * Add new xattr bucket in an extent record and adjust the buckets
4453  * accordingly.  xb_bh is the ocfs2_xattr_block, and target is the
4454  * bucket we want to insert into.
4455  *
4456  * In the easy case, we will move all the buckets after target down by
4457  * one. Half of target's xattrs will be moved to the next bucket.
4458  *
4459  * If current cluster is full, we'll allocate a new one.  This may not
4460  * be contiguous.  The underlying calls will make sure that there is
4461  * space for the insert, shifting buckets around if necessary.
4462  * 'target' may be moved by those calls.
4463  */
4464 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
4465                                       struct buffer_head *xb_bh,
4466                                       struct ocfs2_xattr_bucket *target,
4467                                       struct ocfs2_xattr_set_ctxt *ctxt)
4468 {
4469         struct ocfs2_xattr_block *xb =
4470                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4471         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
4472         struct ocfs2_extent_list *el = &xb_root->xt_list;
4473         u32 name_hash =
4474                 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
4475         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4476         int ret, num_buckets, extend = 1;
4477         u64 p_blkno;
4478         u32 e_cpos, num_clusters;
4479         /* The bucket at the front of the extent */
4480         struct ocfs2_xattr_bucket *first;
4481
4482         mlog(0, "Add new xattr bucket starting from %llu\n",
4483              (unsigned long long)bucket_blkno(target));
4484
4485         /* The first bucket of the original extent */
4486         first = ocfs2_xattr_bucket_new(inode);
4487         if (!first) {
4488                 ret = -ENOMEM;
4489                 mlog_errno(ret);
4490                 goto out;
4491         }
4492
4493         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
4494                                   &num_clusters, el);
4495         if (ret) {
4496                 mlog_errno(ret);
4497                 goto out;
4498         }
4499
4500         ret = ocfs2_read_xattr_bucket(first, p_blkno);
4501         if (ret) {
4502                 mlog_errno(ret);
4503                 goto out;
4504         }
4505
4506         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
4507         if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
4508                 /*
4509                  * This can move first+target if the target bucket moves
4510                  * to the new extent.
4511                  */
4512                 ret = ocfs2_add_new_xattr_cluster(inode,
4513                                                   xb_bh,
4514                                                   first,
4515                                                   target,
4516                                                   &num_clusters,
4517                                                   e_cpos,
4518                                                   &extend,
4519                                                   ctxt);
4520                 if (ret) {
4521                         mlog_errno(ret);
4522                         goto out;
4523                 }
4524         }
4525
4526         if (extend) {
4527                 ret = ocfs2_extend_xattr_bucket(inode,
4528                                                 ctxt->handle,
4529                                                 first,
4530                                                 bucket_blkno(target),
4531                                                 num_clusters);
4532                 if (ret)
4533                         mlog_errno(ret);
4534         }
4535
4536 out:
4537         ocfs2_xattr_bucket_free(first);
4538
4539         return ret;
4540 }
4541
4542 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
4543                                         struct ocfs2_xattr_bucket *bucket,
4544                                         int offs)
4545 {
4546         int block_off = offs >> inode->i_sb->s_blocksize_bits;
4547
4548         offs = offs % inode->i_sb->s_blocksize;
4549         return bucket_block(bucket, block_off) + offs;
4550 }
4551
4552 /*
4553  * Handle the normal xattr set, including replace, delete and new.
4554  *
4555  * Note: "local" indicates the real data's locality. So we can't
4556  * just its bucket locality by its length.
4557  */
4558 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
4559                                          struct ocfs2_xattr_info *xi,
4560                                          struct ocfs2_xattr_search *xs,
4561                                          u32 name_hash,
4562                                          int local)
4563 {
4564         struct ocfs2_xattr_entry *last, *xe;
4565         int name_len = strlen(xi->name);
4566         struct ocfs2_xattr_header *xh = xs->header;
4567         u16 count = le16_to_cpu(xh->xh_count), start;
4568         size_t blocksize = inode->i_sb->s_blocksize;
4569         char *val;
4570         size_t offs, size, new_size;
4571
4572         last = &xh->xh_entries[count];
4573         if (!xs->not_found) {
4574                 xe = xs->here;
4575                 offs = le16_to_cpu(xe->xe_name_offset);
4576                 if (ocfs2_xattr_is_local(xe))
4577                         size = OCFS2_XATTR_SIZE(name_len) +
4578                         OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4579                 else
4580                         size = OCFS2_XATTR_SIZE(name_len) +
4581                         OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4582
4583                 /*
4584                  * If the new value will be stored outside, xi->value has been
4585                  * initalized as an empty ocfs2_xattr_value_root, and the same
4586                  * goes with xi->value_len, so we can set new_size safely here.
4587                  * See ocfs2_xattr_set_in_bucket.
4588                  */
4589                 new_size = OCFS2_XATTR_SIZE(name_len) +
4590                            OCFS2_XATTR_SIZE(xi->value_len);
4591
4592                 le16_add_cpu(&xh->xh_name_value_len, -size);
4593                 if (xi->value) {
4594                         if (new_size > size)
4595                                 goto set_new_name_value;
4596
4597                         /* Now replace the old value with new one. */
4598                         if (local)
4599                                 xe->xe_value_size = cpu_to_le64(xi->value_len);
4600                         else
4601                                 xe->xe_value_size = 0;
4602
4603                         val = ocfs2_xattr_bucket_get_val(inode,
4604                                                          xs->bucket, offs);
4605                         memset(val + OCFS2_XATTR_SIZE(name_len), 0,
4606                                size - OCFS2_XATTR_SIZE(name_len));
4607                         if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
4608                                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
4609                                        xi->value, xi->value_len);
4610
4611                         le16_add_cpu(&xh->xh_name_value_len, new_size);
4612                         ocfs2_xattr_set_local(xe, local);
4613                         return;
4614                 } else {
4615                         /*
4616                          * Remove the old entry if there is more than one.
4617                          * We don't remove the last entry so that we can
4618                          * use it to indicate the hash value of the empty
4619                          * bucket.
4620                          */
4621                         last -= 1;
4622                         le16_add_cpu(&xh->xh_count, -1);
4623                         if (xh->xh_count) {
4624                                 memmove(xe, xe + 1,
4625                                         (void *)last - (void *)xe);
4626                                 memset(last, 0,
4627                                        sizeof(struct ocfs2_xattr_entry));
4628                         } else
4629                                 xh->xh_free_start =
4630                                         cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4631
4632                         return;
4633                 }
4634         } else {
4635                 /* find a new entry for insert. */
4636                 int low = 0, high = count - 1, tmp;
4637                 struct ocfs2_xattr_entry *tmp_xe;
4638
4639                 while (low <= high && count) {
4640                         tmp = (low + high) / 2;
4641                         tmp_xe = &xh->xh_entries[tmp];
4642
4643                         if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
4644                                 low = tmp + 1;
4645                         else if (name_hash <
4646                                  le32_to_cpu(tmp_xe->xe_name_hash))
4647                                 high = tmp - 1;
4648                         else {
4649                                 low = tmp;
4650                                 break;
4651                         }
4652                 }
4653
4654                 xe = &xh->xh_entries[low];
4655                 if (low != count)
4656                         memmove(xe + 1, xe, (void *)last - (void *)xe);
4657
4658                 le16_add_cpu(&xh->xh_count, 1);
4659                 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4660                 xe->xe_name_hash = cpu_to_le32(name_hash);
4661                 xe->xe_name_len = name_len;
4662                 ocfs2_xattr_set_type(xe, xi->name_index);
4663         }
4664
4665 set_new_name_value:
4666         /* Insert the new name+value. */
4667         size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4668
4669         /*
4670          * We must make sure that the name/value pair
4671          * exists in the same block.
4672          */
4673         offs = le16_to_cpu(xh->xh_free_start);
4674         start = offs - size;
4675
4676         if (start >> inode->i_sb->s_blocksize_bits !=
4677             (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4678                 offs = offs - offs % blocksize;
4679                 xh->xh_free_start = cpu_to_le16(offs);
4680         }
4681
4682         val = ocfs2_xattr_bucket_get_val(inode, xs->bucket, offs - size);
4683         xe->xe_name_offset = cpu_to_le16(offs - size);
4684
4685         memset(val, 0, size);
4686         memcpy(val, xi->name, name_len);
4687         memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4688
4689         xe->xe_value_size = cpu_to_le64(xi->value_len);
4690         ocfs2_xattr_set_local(xe, local);
4691         xs->here = xe;
4692         le16_add_cpu(&xh->xh_free_start, -size);
4693         le16_add_cpu(&xh->xh_name_value_len, size);
4694
4695         return;
4696 }
4697
4698 /*
4699  * Set the xattr entry in the specified bucket.
4700  * The bucket is indicated by xs->bucket and it should have the enough
4701  * space for the xattr insertion.
4702  */
4703 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4704                                            handle_t *handle,
4705                                            struct ocfs2_xattr_info *xi,
4706                                            struct ocfs2_xattr_search *xs,
4707                                            u32 name_hash,
4708                                            int local)
4709 {
4710         int ret;
4711         u64 blkno;
4712
4713         mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4714              (unsigned long)xi->value_len, xi->name_index,
4715              (unsigned long long)bucket_blkno(xs->bucket));
4716
4717         if (!xs->bucket->bu_bhs[1]) {
4718                 blkno = bucket_blkno(xs->bucket);
4719                 ocfs2_xattr_bucket_relse(xs->bucket);
4720                 ret = ocfs2_read_xattr_bucket(xs->bucket, blkno);
4721                 if (ret) {
4722                         mlog_errno(ret);
4723                         goto out;
4724                 }
4725         }
4726
4727         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4728                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4729         if (ret < 0) {
4730                 mlog_errno(ret);
4731                 goto out;
4732         }
4733
4734         ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4735         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4736
4737 out:
4738         return ret;
4739 }
4740
4741 /*
4742  * Truncate the specified xe_off entry in xattr bucket.
4743  * bucket is indicated by header_bh and len is the new length.
4744  * Both the ocfs2_xattr_value_root and the entry will be updated here.
4745  *
4746  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4747  */
4748 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4749                                              struct ocfs2_xattr_bucket *bucket,
4750                                              int xe_off,
4751                                              int len,
4752                                              struct ocfs2_xattr_set_ctxt *ctxt)
4753 {
4754         int ret, offset;
4755         u64 value_blk;
4756         struct ocfs2_xattr_entry *xe;
4757         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4758         size_t blocksize = inode->i_sb->s_blocksize;
4759         struct ocfs2_xattr_value_buf vb = {
4760                 .vb_access = ocfs2_journal_access,
4761         };
4762
4763         xe = &xh->xh_entries[xe_off];
4764
4765         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4766
4767         offset = le16_to_cpu(xe->xe_name_offset) +
4768                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4769
4770         value_blk = offset / blocksize;
4771
4772         /* We don't allow ocfs2_xattr_value to be stored in different block. */
4773         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4774
4775         vb.vb_bh = bucket->bu_bhs[value_blk];
4776         BUG_ON(!vb.vb_bh);
4777
4778         vb.vb_xv = (struct ocfs2_xattr_value_root *)
4779                 (vb.vb_bh->b_data + offset % blocksize);
4780
4781         /*
4782          * From here on out we have to dirty the bucket.  The generic
4783          * value calls only modify one of the bucket's bhs, but we need
4784          * to send the bucket at once.  So if they error, they *could* have
4785          * modified something.  We have to assume they did, and dirty
4786          * the whole bucket.  This leaves us in a consistent state.
4787          */
4788         mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4789              xe_off, (unsigned long long)bucket_blkno(bucket), len);
4790         ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
4791         if (ret) {
4792                 mlog_errno(ret);
4793                 goto out;
4794         }
4795
4796         ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
4797                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4798         if (ret) {
4799                 mlog_errno(ret);
4800                 goto out;
4801         }
4802
4803         xe->xe_value_size = cpu_to_le64(len);
4804
4805         ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
4806
4807 out:
4808         return ret;
4809 }
4810
4811 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4812                                         struct ocfs2_xattr_search *xs,
4813                                         int len,
4814                                         struct ocfs2_xattr_set_ctxt *ctxt)
4815 {
4816         int ret, offset;
4817         struct ocfs2_xattr_entry *xe = xs->here;
4818         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4819
4820         BUG_ON(!xs->bucket->bu_bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4821
4822         offset = xe - xh->xh_entries;
4823         ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket,
4824                                                 offset, len, ctxt);
4825         if (ret)
4826                 mlog_errno(ret);
4827
4828         return ret;
4829 }
4830
4831 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4832                                                 handle_t *handle,
4833                                                 struct ocfs2_xattr_search *xs,
4834                                                 char *val,
4835                                                 int value_len)
4836 {
4837         int ret, offset, block_off;
4838         struct ocfs2_xattr_value_root *xv;
4839         struct ocfs2_xattr_entry *xe = xs->here;
4840         struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
4841         void *base;
4842         struct ocfs2_xattr_value_buf vb = {
4843                 .vb_access = ocfs2_journal_access,
4844         };
4845
4846         BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4847
4848         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb, xh,
4849                                                 xe - xh->xh_entries,
4850                                                 &block_off,
4851                                                 &offset);
4852         if (ret) {
4853                 mlog_errno(ret);
4854                 goto out;
4855         }
4856
4857         base = bucket_block(xs->bucket, block_off);
4858         xv = (struct ocfs2_xattr_value_root *)(base + offset +
4859                  OCFS2_XATTR_SIZE(xe->xe_name_len));
4860
4861         vb.vb_xv = xv;
4862         vb.vb_bh = xs->bucket->bu_bhs[block_off];
4863         ret = __ocfs2_xattr_set_value_outside(inode, handle,
4864                                               &vb, val, value_len);
4865         if (ret)
4866                 mlog_errno(ret);
4867 out:
4868         return ret;
4869 }
4870
4871 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4872                                   struct buffer_head *root_bh,
4873                                   u64 blkno,
4874                                   u32 cpos,
4875                                   u32 len)
4876 {
4877         int ret;
4878         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4879         struct inode *tl_inode = osb->osb_tl_inode;
4880         handle_t *handle;
4881         struct ocfs2_xattr_block *xb =
4882                         (struct ocfs2_xattr_block *)root_bh->b_data;
4883         struct ocfs2_alloc_context *meta_ac = NULL;
4884         struct ocfs2_cached_dealloc_ctxt dealloc;
4885         struct ocfs2_extent_tree et;
4886
4887         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
4888
4889         ocfs2_init_dealloc_ctxt(&dealloc);
4890
4891         mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4892              cpos, len, (unsigned long long)blkno);
4893
4894         ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
4895                                                len);
4896
4897         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4898         if (ret) {
4899                 mlog_errno(ret);
4900                 return ret;
4901         }
4902
4903         mutex_lock(&tl_inode->i_mutex);
4904
4905         if (ocfs2_truncate_log_needs_flush(osb)) {
4906                 ret = __ocfs2_flush_truncate_log(osb);
4907                 if (ret < 0) {
4908                         mlog_errno(ret);
4909                         goto out;
4910                 }
4911         }
4912
4913         handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
4914         if (IS_ERR(handle)) {
4915                 ret = -ENOMEM;
4916                 mlog_errno(ret);
4917                 goto out;
4918         }
4919
4920         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
4921                                       OCFS2_JOURNAL_ACCESS_WRITE);
4922         if (ret) {
4923                 mlog_errno(ret);
4924                 goto out_commit;
4925         }
4926
4927         ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
4928                                   &dealloc);
4929         if (ret) {
4930                 mlog_errno(ret);
4931                 goto out_commit;
4932         }
4933
4934         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4935
4936         ret = ocfs2_journal_dirty(handle, root_bh);
4937         if (ret) {
4938                 mlog_errno(ret);
4939                 goto out_commit;
4940         }
4941
4942         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4943         if (ret)
4944                 mlog_errno(ret);
4945
4946 out_commit:
4947         ocfs2_commit_trans(osb, handle);
4948 out:
4949         ocfs2_schedule_truncate_log_flush(osb, 1);
4950
4951         mutex_unlock(&tl_inode->i_mutex);
4952
4953         if (meta_ac)
4954                 ocfs2_free_alloc_context(meta_ac);
4955
4956         ocfs2_run_deallocs(osb, &dealloc);
4957
4958         return ret;
4959 }
4960
4961 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4962                                          handle_t *handle,
4963                                          struct ocfs2_xattr_search *xs)
4964 {
4965         struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
4966         struct ocfs2_xattr_entry *last = &xh->xh_entries[
4967                                                 le16_to_cpu(xh->xh_count) - 1];
4968         int ret = 0;
4969
4970         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4971                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4972         if (ret) {
4973                 mlog_errno(ret);
4974                 return;
4975         }
4976
4977         /* Remove the old entry. */
4978         memmove(xs->here, xs->here + 1,
4979                 (void *)last - (void *)xs->here);
4980         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4981         le16_add_cpu(&xh->xh_count, -1);
4982
4983         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4984 }
4985
4986 /*
4987  * Set the xattr name/value in the bucket specified in xs.
4988  *
4989  * As the new value in xi may be stored in the bucket or in an outside cluster,
4990  * we divide the whole process into 3 steps:
4991  * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4992  * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4993  * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4994  * 4. If the clusters for the new outside value can't be allocated, we need
4995  *    to free the xattr we allocated in set.
4996  */
4997 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4998                                      struct ocfs2_xattr_info *xi,
4999                                      struct ocfs2_xattr_search *xs,
5000                                      struct ocfs2_xattr_set_ctxt *ctxt)
5001 {
5002         int ret, local = 1;
5003         size_t value_len;
5004         char *val = (char *)xi->value;
5005         struct ocfs2_xattr_entry *xe = xs->here;
5006         u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
5007                                               strlen(xi->name));
5008
5009         if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
5010                 /*
5011                  * We need to truncate the xattr storage first.
5012                  *
5013                  * If both the old and new value are stored to
5014                  * outside block, we only need to truncate
5015                  * the storage and then set the value outside.
5016                  *
5017                  * If the new value should be stored within block,
5018                  * we should free all the outside block first and
5019                  * the modification to the xattr block will be done
5020                  * by following steps.
5021                  */
5022                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
5023                         value_len = xi->value_len;
5024                 else
5025                         value_len = 0;
5026
5027                 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
5028                                                            value_len,
5029                                                            ctxt);
5030                 if (ret)
5031                         goto out;
5032
5033                 if (value_len)
5034                         goto set_value_outside;
5035         }
5036
5037         value_len = xi->value_len;
5038         /* So we have to handle the inside block change now. */
5039         if (value_len > OCFS2_XATTR_INLINE_SIZE) {
5040                 /*
5041                  * If the new value will be stored outside of block,
5042                  * initalize a new empty value root and insert it first.
5043                  */
5044                 local = 0;
5045                 xi->value = &def_xv;
5046                 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
5047         }
5048
5049         ret = ocfs2_xattr_set_entry_in_bucket(inode, ctxt->handle, xi, xs,
5050                                               name_hash, local);
5051         if (ret) {
5052                 mlog_errno(ret);
5053                 goto out;
5054         }
5055
5056         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
5057                 goto out;
5058
5059         /* allocate the space now for the outside block storage. */
5060         ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
5061                                                    value_len, ctxt);
5062         if (ret) {
5063                 mlog_errno(ret);
5064
5065                 if (xs->not_found) {
5066                         /*
5067                          * We can't allocate enough clusters for outside
5068                          * storage and we have allocated xattr already,
5069                          * so need to remove it.
5070                          */
5071                         ocfs2_xattr_bucket_remove_xs(inode, ctxt->handle, xs);
5072                 }
5073                 goto out;
5074         }
5075
5076 set_value_outside:
5077         ret = ocfs2_xattr_bucket_set_value_outside(inode, ctxt->handle,
5078                                                    xs, val, value_len);
5079 out:
5080         return ret;
5081 }
5082
5083 /*
5084  * check whether the xattr bucket is filled up with the same hash value.
5085  * If we want to insert the xattr with the same hash, return -ENOSPC.
5086  * If we want to insert a xattr with different hash value, go ahead
5087  * and ocfs2_divide_xattr_bucket will handle this.
5088  */
5089 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5090                                               struct ocfs2_xattr_bucket *bucket,
5091                                               const char *name)
5092 {
5093         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5094         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5095
5096         if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5097                 return 0;
5098
5099         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5100             xh->xh_entries[0].xe_name_hash) {
5101                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5102                      "hash = %u\n",
5103                      (unsigned long long)bucket_blkno(bucket),
5104                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5105                 return -ENOSPC;
5106         }
5107
5108         return 0;
5109 }
5110
5111 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5112                                              struct ocfs2_xattr_info *xi,
5113                                              struct ocfs2_xattr_search *xs,
5114                                              struct ocfs2_xattr_set_ctxt *ctxt)
5115 {
5116         struct ocfs2_xattr_header *xh;
5117         struct ocfs2_xattr_entry *xe;
5118         u16 count, header_size, xh_free_start;
5119         int free, max_free, need, old;
5120         size_t value_size = 0, name_len = strlen(xi->name);
5121         size_t blocksize = inode->i_sb->s_blocksize;
5122         int ret, allocation = 0;
5123
5124         mlog_entry("Set xattr %s in xattr index block\n", xi->name);
5125
5126 try_again:
5127         xh = xs->header;
5128         count = le16_to_cpu(xh->xh_count);
5129         xh_free_start = le16_to_cpu(xh->xh_free_start);
5130         header_size = sizeof(struct ocfs2_xattr_header) +
5131                         count * sizeof(struct ocfs2_xattr_entry);
5132         max_free = OCFS2_XATTR_BUCKET_SIZE - header_size -
5133                 le16_to_cpu(xh->xh_name_value_len) - OCFS2_XATTR_HEADER_GAP;
5134
5135         mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
5136                         "of %u which exceed block size\n",
5137                         (unsigned long long)bucket_blkno(xs->bucket),
5138                         header_size);
5139
5140         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
5141                 value_size = OCFS2_XATTR_ROOT_SIZE;
5142         else if (xi->value)
5143                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
5144
5145         if (xs->not_found)
5146                 need = sizeof(struct ocfs2_xattr_entry) +
5147                         OCFS2_XATTR_SIZE(name_len) + value_size;
5148         else {
5149                 need = value_size + OCFS2_XATTR_SIZE(name_len);
5150
5151                 /*
5152                  * We only replace the old value if the new length is smaller
5153                  * than the old one. Otherwise we will allocate new space in the
5154                  * bucket to store it.
5155                  */
5156                 xe = xs->here;
5157                 if (ocfs2_xattr_is_local(xe))
5158                         old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
5159                 else
5160                         old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
5161
5162                 if (old >= value_size)
5163                         need = 0;
5164         }
5165
5166         free = xh_free_start - header_size - OCFS2_XATTR_HEADER_GAP;
5167         /*
5168          * We need to make sure the new name/value pair
5169          * can exist in the same block.
5170          */
5171         if (xh_free_start % blocksize < need)
5172                 free -= xh_free_start % blocksize;
5173
5174         mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
5175              "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
5176              " %u\n", xs->not_found,
5177              (unsigned long long)bucket_blkno(xs->bucket),
5178              free, need, max_free, le16_to_cpu(xh->xh_free_start),
5179              le16_to_cpu(xh->xh_name_value_len));
5180
5181         if (free < need ||
5182             (xs->not_found &&
5183              count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb))) {
5184                 if (need <= max_free &&
5185                     count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
5186                         /*
5187                          * We can create the space by defragment. Since only the
5188                          * name/value will be moved, the xe shouldn't be changed
5189                          * in xs.
5190                          */
5191                         ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5192                                                         xs->bucket);
5193                         if (ret) {
5194                                 mlog_errno(ret);
5195                                 goto out;
5196                         }
5197
5198                         xh_free_start = le16_to_cpu(xh->xh_free_start);
5199                         free = xh_free_start - header_size
5200                                 - OCFS2_XATTR_HEADER_GAP;
5201                         if (xh_free_start % blocksize < need)
5202                                 free -= xh_free_start % blocksize;
5203
5204                         if (free >= need)
5205                                 goto xattr_set;
5206
5207                         mlog(0, "Can't get enough space for xattr insert by "
5208                              "defragment. Need %u bytes, but we have %d, so "
5209                              "allocate new bucket for it.\n", need, free);
5210                 }
5211
5212                 /*
5213                  * We have to add new buckets or clusters and one
5214                  * allocation should leave us enough space for insert.
5215                  */
5216                 BUG_ON(allocation);
5217
5218                 /*
5219                  * We do not allow for overlapping ranges between buckets. And
5220                  * the maximum number of collisions we will allow for then is
5221                  * one bucket's worth, so check it here whether we need to
5222                  * add a new bucket for the insert.
5223                  */
5224                 ret = ocfs2_check_xattr_bucket_collision(inode,
5225                                                          xs->bucket,
5226                                                          xi->name);
5227                 if (ret) {
5228                         mlog_errno(ret);
5229                         goto out;
5230                 }
5231
5232                 ret = ocfs2_add_new_xattr_bucket(inode,
5233                                                  xs->xattr_bh,
5234                                                  xs->bucket,
5235                                                  ctxt);
5236                 if (ret) {
5237                         mlog_errno(ret);
5238                         goto out;
5239                 }
5240
5241                 /*
5242                  * ocfs2_add_new_xattr_bucket() will have updated
5243                  * xs->bucket if it moved, but it will not have updated
5244                  * any of the other search fields.  Thus, we drop it and
5245                  * re-search.  Everything should be cached, so it'll be
5246                  * quick.
5247                  */
5248                 ocfs2_xattr_bucket_relse(xs->bucket);
5249                 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5250                                                    xi->name_index,
5251                                                    xi->name, xs);
5252                 if (ret && ret != -ENODATA)
5253                         goto out;
5254                 xs->not_found = ret;
5255                 allocation = 1;
5256                 goto try_again;
5257         }
5258
5259 xattr_set:
5260         ret = ocfs2_xattr_set_in_bucket(inode, xi, xs, ctxt);
5261 out:
5262         mlog_exit(ret);
5263         return ret;
5264 }
5265
5266 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5267                                         struct ocfs2_xattr_bucket *bucket,
5268                                         void *para)
5269 {
5270         int ret = 0;
5271         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5272         u16 i;
5273         struct ocfs2_xattr_entry *xe;
5274         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5275         struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5276         int credits = ocfs2_remove_extent_credits(osb->sb) +
5277                 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5278
5279
5280         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5281
5282         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5283                 xe = &xh->xh_entries[i];
5284                 if (ocfs2_xattr_is_local(xe))
5285                         continue;
5286
5287                 ctxt.handle = ocfs2_start_trans(osb, credits);
5288                 if (IS_ERR(ctxt.handle)) {
5289                         ret = PTR_ERR(ctxt.handle);
5290                         mlog_errno(ret);
5291                         break;
5292                 }
5293
5294                 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5295                                                         i, 0, &ctxt);
5296
5297                 ocfs2_commit_trans(osb, ctxt.handle);
5298                 if (ret) {
5299                         mlog_errno(ret);
5300                         break;
5301                 }
5302         }
5303
5304         ocfs2_schedule_truncate_log_flush(osb, 1);
5305         ocfs2_run_deallocs(osb, &ctxt.dealloc);
5306         return ret;
5307 }
5308
5309 static int ocfs2_delete_xattr_index_block(struct inode *inode,
5310                                           struct buffer_head *xb_bh)
5311 {
5312         struct ocfs2_xattr_block *xb =
5313                         (struct ocfs2_xattr_block *)xb_bh->b_data;
5314         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
5315         int ret = 0;
5316         u32 name_hash = UINT_MAX, e_cpos, num_clusters;
5317         u64 p_blkno;
5318
5319         if (le16_to_cpu(el->l_next_free_rec) == 0)
5320                 return 0;
5321
5322         while (name_hash > 0) {
5323                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
5324                                           &e_cpos, &num_clusters, el);
5325                 if (ret) {
5326                         mlog_errno(ret);
5327                         goto out;
5328                 }
5329
5330                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
5331                                                   ocfs2_delete_xattr_in_bucket,
5332                                                   NULL);
5333                 if (ret) {
5334                         mlog_errno(ret);
5335                         goto out;
5336                 }
5337
5338                 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
5339                                              p_blkno, e_cpos, num_clusters);
5340                 if (ret) {
5341                         mlog_errno(ret);
5342                         break;
5343                 }
5344
5345                 if (e_cpos == 0)
5346                         break;
5347
5348                 name_hash = e_cpos - 1;
5349         }
5350
5351 out:
5352         return ret;
5353 }
5354
5355 /*
5356  * Whenever we modify a xattr value root in the bucket(e.g, CoW
5357  * or change the extent record flag), we need to recalculate
5358  * the metaecc for the whole bucket. So it is done here.
5359  *
5360  * Note:
5361  * We have to give the extra credits for the caller.
5362  */
5363 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5364                                             handle_t *handle,
5365                                             void *para)
5366 {
5367         int ret;
5368         struct ocfs2_xattr_bucket *bucket =
5369                         (struct ocfs2_xattr_bucket *)para;
5370
5371         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5372                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5373         if (ret) {
5374                 mlog_errno(ret);
5375                 return ret;
5376         }
5377
5378         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5379
5380         return 0;
5381 }
5382
5383 /*
5384  * Special action we need if the xattr value is refcounted.
5385  *
5386  * 1. If the xattr is refcounted, lock the tree.
5387  * 2. CoW the xattr if we are setting the new value and the value
5388  *    will be stored outside.
5389  * 3. In other case, decrease_refcount will work for us, so just
5390  *    lock the refcount tree, calculate the meta and credits is OK.
5391  *
5392  * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5393  * currently CoW is a completed transaction, while this function
5394  * will also lock the allocators and let us deadlock. So we will
5395  * CoW the whole xattr value.
5396  */
5397 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5398                                         struct ocfs2_dinode *di,
5399                                         struct ocfs2_xattr_info *xi,
5400                                         struct ocfs2_xattr_search *xis,
5401                                         struct ocfs2_xattr_search *xbs,
5402                                         struct ocfs2_refcount_tree **ref_tree,
5403                                         int *meta_add,
5404                                         int *credits)
5405 {
5406         int ret = 0;
5407         struct ocfs2_xattr_block *xb;
5408         struct ocfs2_xattr_entry *xe;
5409         char *base;
5410         u32 p_cluster, num_clusters;
5411         unsigned int ext_flags;
5412         int name_offset, name_len;
5413         struct ocfs2_xattr_value_buf vb;
5414         struct ocfs2_xattr_bucket *bucket = NULL;
5415         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5416         struct ocfs2_post_refcount refcount;
5417         struct ocfs2_post_refcount *p = NULL;
5418         struct buffer_head *ref_root_bh = NULL;
5419
5420         if (!xis->not_found) {
5421                 xe = xis->here;
5422                 name_offset = le16_to_cpu(xe->xe_name_offset);
5423                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5424                 base = xis->base;
5425                 vb.vb_bh = xis->inode_bh;
5426                 vb.vb_access = ocfs2_journal_access_di;
5427         } else {
5428                 int i, block_off = 0;
5429                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5430                 xe = xbs->here;
5431                 name_offset = le16_to_cpu(xe->xe_name_offset);
5432                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5433                 i = xbs->here - xbs->header->xh_entries;
5434
5435                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5436                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5437                                                         bucket_xh(xbs->bucket),
5438                                                         i, &block_off,
5439                                                         &name_offset);
5440                         if (ret) {
5441                                 mlog_errno(ret);
5442                                 goto out;
5443                         }
5444                         base = bucket_block(xbs->bucket, block_off);
5445                         vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5446                         vb.vb_access = ocfs2_journal_access;
5447
5448                         if (ocfs2_meta_ecc(osb)) {
5449                                 /*create parameters for ocfs2_post_refcount. */
5450                                 bucket = xbs->bucket;
5451                                 refcount.credits = bucket->bu_blocks;
5452                                 refcount.para = bucket;
5453                                 refcount.func =
5454                                         ocfs2_xattr_bucket_post_refcount;
5455                                 p = &refcount;
5456                         }
5457                 } else {
5458                         base = xbs->base;
5459                         vb.vb_bh = xbs->xattr_bh;
5460                         vb.vb_access = ocfs2_journal_access_xb;
5461                 }
5462         }
5463
5464         if (ocfs2_xattr_is_local(xe))
5465                 goto out;
5466
5467         vb.vb_xv = (struct ocfs2_xattr_value_root *)
5468                                 (base + name_offset + name_len);
5469
5470         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5471                                        &num_clusters, &vb.vb_xv->xr_list,
5472                                        &ext_flags);
5473         if (ret) {
5474                 mlog_errno(ret);
5475                 goto out;
5476         }
5477
5478         /*
5479          * We just need to check the 1st extent record, since we always
5480          * CoW the whole xattr. So there shouldn't be a xattr with
5481          * some REFCOUNT extent recs after the 1st one.
5482          */
5483         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5484                 goto out;
5485
5486         ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5487                                        1, ref_tree, &ref_root_bh);
5488         if (ret) {
5489                 mlog_errno(ret);
5490                 goto out;
5491         }
5492
5493         /*
5494          * If we are deleting the xattr or the new size will be stored inside,
5495          * cool, leave it there, the xattr truncate process will remove them
5496          * for us(it still needs the refcount tree lock and the meta, credits).
5497          * And the worse case is that every cluster truncate will split the
5498          * refcount tree, and make the original extent become 3. So we will need
5499          * 2 * cluster more extent recs at most.
5500          */
5501         if (!xi->value || xi->value_len <= OCFS2_XATTR_INLINE_SIZE) {
5502
5503                 ret = ocfs2_refcounted_xattr_delete_need(inode,
5504                                                          &(*ref_tree)->rf_ci,
5505                                                          ref_root_bh, vb.vb_xv,
5506                                                          meta_add, credits);
5507                 if (ret)
5508                         mlog_errno(ret);
5509                 goto out;
5510         }
5511
5512         ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5513                                        *ref_tree, ref_root_bh, 0,
5514                                        le32_to_cpu(vb.vb_xv->xr_clusters), p);
5515         if (ret)
5516                 mlog_errno(ret);
5517
5518 out:
5519         brelse(ref_root_bh);
5520         return ret;
5521 }
5522
5523 /*
5524  * 'security' attributes support
5525  */
5526 static size_t ocfs2_xattr_security_list(struct inode *inode, char *list,
5527                                         size_t list_size, const char *name,
5528                                         size_t name_len)
5529 {
5530         const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
5531         const size_t total_len = prefix_len + name_len + 1;
5532
5533         if (list && total_len <= list_size) {
5534                 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
5535                 memcpy(list + prefix_len, name, name_len);
5536                 list[prefix_len + name_len] = '\0';
5537         }
5538         return total_len;
5539 }
5540
5541 static int ocfs2_xattr_security_get(struct inode *inode, const char *name,
5542                                     void *buffer, size_t size)
5543 {
5544         if (strcmp(name, "") == 0)
5545                 return -EINVAL;
5546         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_SECURITY, name,
5547                                buffer, size);
5548 }
5549
5550 static int ocfs2_xattr_security_set(struct inode *inode, const char *name,
5551                                     const void *value, size_t size, int flags)
5552 {
5553         if (strcmp(name, "") == 0)
5554                 return -EINVAL;
5555
5556         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY, name, value,
5557                                size, flags);
5558 }
5559
5560 int ocfs2_init_security_get(struct inode *inode,
5561                             struct inode *dir,
5562                             struct ocfs2_security_xattr_info *si)
5563 {
5564         /* check whether ocfs2 support feature xattr */
5565         if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
5566                 return -EOPNOTSUPP;
5567         return security_inode_init_security(inode, dir, &si->name, &si->value,
5568                                             &si->value_len);
5569 }
5570
5571 int ocfs2_init_security_set(handle_t *handle,
5572                             struct inode *inode,
5573                             struct buffer_head *di_bh,
5574                             struct ocfs2_security_xattr_info *si,
5575                             struct ocfs2_alloc_context *xattr_ac,
5576                             struct ocfs2_alloc_context *data_ac)
5577 {
5578         return ocfs2_xattr_set_handle(handle, inode, di_bh,
5579                                      OCFS2_XATTR_INDEX_SECURITY,
5580                                      si->name, si->value, si->value_len, 0,
5581                                      xattr_ac, data_ac);
5582 }
5583
5584 struct xattr_handler ocfs2_xattr_security_handler = {
5585         .prefix = XATTR_SECURITY_PREFIX,
5586         .list   = ocfs2_xattr_security_list,
5587         .get    = ocfs2_xattr_security_get,
5588         .set    = ocfs2_xattr_security_set,
5589 };
5590
5591 /*
5592  * 'trusted' attributes support
5593  */
5594 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
5595                                        size_t list_size, const char *name,
5596                                        size_t name_len)
5597 {
5598         const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
5599         const size_t total_len = prefix_len + name_len + 1;
5600
5601         if (list && total_len <= list_size) {
5602                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
5603                 memcpy(list + prefix_len, name, name_len);
5604                 list[prefix_len + name_len] = '\0';
5605         }
5606         return total_len;
5607 }
5608
5609 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
5610                                    void *buffer, size_t size)
5611 {
5612         if (strcmp(name, "") == 0)
5613                 return -EINVAL;
5614         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
5615                                buffer, size);
5616 }
5617
5618 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
5619                                    const void *value, size_t size, int flags)
5620 {
5621         if (strcmp(name, "") == 0)
5622                 return -EINVAL;
5623
5624         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
5625                                size, flags);
5626 }
5627
5628 struct xattr_handler ocfs2_xattr_trusted_handler = {
5629         .prefix = XATTR_TRUSTED_PREFIX,
5630         .list   = ocfs2_xattr_trusted_list,
5631         .get    = ocfs2_xattr_trusted_get,
5632         .set    = ocfs2_xattr_trusted_set,
5633 };
5634
5635 /*
5636  * 'user' attributes support
5637  */
5638 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
5639                                     size_t list_size, const char *name,
5640                                     size_t name_len)
5641 {
5642         const size_t prefix_len = XATTR_USER_PREFIX_LEN;
5643         const size_t total_len = prefix_len + name_len + 1;
5644         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5645
5646         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5647                 return 0;
5648
5649         if (list && total_len <= list_size) {
5650                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
5651                 memcpy(list + prefix_len, name, name_len);
5652                 list[prefix_len + name_len] = '\0';
5653         }
5654         return total_len;
5655 }
5656
5657 static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
5658                                 void *buffer, size_t size)
5659 {
5660         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5661
5662         if (strcmp(name, "") == 0)
5663                 return -EINVAL;
5664         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5665                 return -EOPNOTSUPP;
5666         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
5667                                buffer, size);
5668 }
5669
5670 static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
5671                                 const void *value, size_t size, int flags)
5672 {
5673         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5674
5675         if (strcmp(name, "") == 0)
5676                 return -EINVAL;
5677         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5678                 return -EOPNOTSUPP;
5679
5680         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
5681                                size, flags);
5682 }
5683
5684 struct xattr_handler ocfs2_xattr_user_handler = {
5685         .prefix = XATTR_USER_PREFIX,
5686         .list   = ocfs2_xattr_user_list,
5687         .get    = ocfs2_xattr_user_get,
5688         .set    = ocfs2_xattr_user_set,
5689 };