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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 "dlmglue.h"
  46 #include "file.h"
  47 #include "symlink.h"
  48 #include "sysfile.h"
  49 #include "inode.h"
  50 #include "journal.h"
  51 #include "ocfs2_fs.h"
  52 #include "suballoc.h"
  53 #include "uptodate.h"
  54 #include "buffer_head_io.h"
  55 #include "super.h"
  56 #include "xattr.h"
  57
  58
  59 struct ocfs2_xattr_def_value_root {
  60         struct ocfs2_xattr_value_root   xv;
  61         struct ocfs2_extent_rec         er;
  62 };
  63
  64 struct ocfs2_xattr_bucket {
  65         /* The inode these xattrs are associated with */
  66         struct inode *bu_inode;
  67
  68         /* The actual buffers that make up the bucket */
  69         struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
  70
  71         /* How many blocks make up one bucket for this filesystem */
  72         int bu_blocks;
  73 };
  74
  75 struct ocfs2_xattr_set_ctxt {
  76         handle_t *handle;
  77         struct ocfs2_alloc_context *meta_ac;
  78         struct ocfs2_alloc_context *data_ac;
  79         struct ocfs2_cached_dealloc_ctxt dealloc;
  80 };
  81
  82 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
  83 #define OCFS2_XATTR_INLINE_SIZE 80
  84 #define OCFS2_XATTR_FREE_IN_IBODY       (OCFS2_MIN_XATTR_INLINE_SIZE \
  85                                          - sizeof(struct ocfs2_xattr_header) \
  86                                          - sizeof(__u32))
  87 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr)  ((ptr)->i_sb->s_blocksize \
  88                                          - sizeof(struct ocfs2_xattr_block) \
  89                                          - sizeof(struct ocfs2_xattr_header) \
  90                                          - sizeof(__u32))
  91
  92 static struct ocfs2_xattr_def_value_root def_xv = {
  93         .xv.xr_list.l_count = cpu_to_le16(1),
  94 };
  95
  96 struct xattr_handler *ocfs2_xattr_handlers[] = {
  97         &ocfs2_xattr_user_handler,
  98 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
  99         &ocfs2_xattr_acl_access_handler,
 100         &ocfs2_xattr_acl_default_handler,
 101 #endif
 102         &ocfs2_xattr_trusted_handler,
 103         &ocfs2_xattr_security_handler,
 104         NULL
 105 };
 106
 107 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
 108         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
 109 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
 110         [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
 111                                         = &ocfs2_xattr_acl_access_handler,
 112         [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
 113                                         = &ocfs2_xattr_acl_default_handler,
 114 #endif
 115         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
 116         [OCFS2_XATTR_INDEX_SECURITY]    = &ocfs2_xattr_security_handler,
 117 };
 118
 119 struct ocfs2_xattr_info {
 120         int name_index;
 121         const char *name;
 122         const void *value;
 123         size_t value_len;
 124 };
 125
 126 struct ocfs2_xattr_search {
 127         struct buffer_head *inode_bh;
 128         /*
 129          * xattr_bh point to the block buffer head which has extended attribute
 130          * when extended attribute in inode, xattr_bh is equal to inode_bh.
 131          */
 132         struct buffer_head *xattr_bh;
 133         struct ocfs2_xattr_header *header;
 134         struct ocfs2_xattr_bucket *bucket;
 135         void *base;
 136         void *end;
 137         struct ocfs2_xattr_entry *here;
 138         int not_found;
 139 };
 140
 141 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
 142                                              struct ocfs2_xattr_header *xh,
 143                                              int index,
 144                                              int *block_off,
 145                                              int *new_offset);
 146
 147 static int ocfs2_xattr_block_find(struct inode *inode,
 148                                   int name_index,
 149                                   const char *name,
 150                                   struct ocfs2_xattr_search *xs);
 151 static int ocfs2_xattr_index_block_find(struct inode *inode,
 152                                         struct buffer_head *root_bh,
 153                                         int name_index,
 154                                         const char *name,
 155                                         struct ocfs2_xattr_search *xs);
 156
 157 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
 158                                         struct ocfs2_xattr_tree_root *xt,
 159                                         char *buffer,
 160                                         size_t buffer_size);
 161
 162 static int ocfs2_xattr_create_index_block(struct inode *inode,
 163                                           struct ocfs2_xattr_search *xs,
 164                                           struct ocfs2_xattr_set_ctxt *ctxt);
 165
 166 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
 167                                              struct ocfs2_xattr_info *xi,
 168                                              struct ocfs2_xattr_search *xs,
 169                                              struct ocfs2_xattr_set_ctxt *ctxt);
 170
 171 static int ocfs2_delete_xattr_index_block(struct inode *inode,
 172                                           struct buffer_head *xb_bh);
 173 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
 174                                   u64 src_blk, u64 last_blk, u64 to_blk,
 175                                   unsigned int start_bucket,
 176                                   u32 *first_hash);
 177
 178 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
 179 {
 180         return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
 181 }
 182
 183 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
 184 {
 185         return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
 186 }
 187
 188 static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
 189 {
 190         u16 len = sb->s_blocksize -
 191                  offsetof(struct ocfs2_xattr_header, xh_entries);
 192
 193         return len / sizeof(struct ocfs2_xattr_entry);
 194 }
 195
 196 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
 197 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
 198 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
 199
 200 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
 201 {
 202         struct ocfs2_xattr_bucket *bucket;
 203         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
 204
 205         BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
 206
 207         bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
 208         if (bucket) {
 209                 bucket->bu_inode = inode;
 210                 bucket->bu_blocks = blks;
 211         }
 212
 213         return bucket;
 214 }
 215
 216 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
 217 {
 218         int i;
 219
 220         for (i = 0; i < bucket->bu_blocks; i++) {
 221                 brelse(bucket->bu_bhs[i]);
 222                 bucket->bu_bhs[i] = NULL;
 223         }
 224 }
 225
 226 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
 227 {
 228         if (bucket) {
 229                 ocfs2_xattr_bucket_relse(bucket);
 230                 bucket->bu_inode = NULL;
 231                 kfree(bucket);
 232         }
 233 }
 234
 235 /*
 236  * A bucket that has never been written to disk doesn't need to be
 237  * read.  We just need the buffer_heads.  Don't call this for
 238  * buckets that are already on disk.  ocfs2_read_xattr_bucket() initializes
 239  * them fully.
 240  */
 241 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 242                                    u64 xb_blkno)
 243 {
 244         int i, rc = 0;
 245
 246         for (i = 0; i < bucket->bu_blocks; i++) {
 247                 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
 248                                               xb_blkno + i);
 249                 if (!bucket->bu_bhs[i]) {
 250                         rc = -EIO;
 251                         mlog_errno(rc);
 252                         break;
 253                 }
 254
 255                 if (!ocfs2_buffer_uptodate(bucket->bu_inode,
 256                                            bucket->bu_bhs[i]))
 257                         ocfs2_set_new_buffer_uptodate(bucket->bu_inode,
 258                                                       bucket->bu_bhs[i]);
 259         }
 260
 261         if (rc)
 262                 ocfs2_xattr_bucket_relse(bucket);
 263         return rc;
 264 }
 265
 266 /* Read the xattr bucket at xb_blkno */
 267 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 268                                    u64 xb_blkno)
 269 {
 270         int rc;
 271
 272         rc = ocfs2_read_blocks(bucket->bu_inode, xb_blkno,
 273                                bucket->bu_blocks, bucket->bu_bhs, 0,
 274                                NULL);
 275         if (rc)
 276                 ocfs2_xattr_bucket_relse(bucket);
 277         return rc;
 278 }
 279
 280 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
 281                                              struct ocfs2_xattr_bucket *bucket,
 282                                              int type)
 283 {
 284         int i, rc = 0;
 285
 286         for (i = 0; i < bucket->bu_blocks; i++) {
 287                 rc = ocfs2_journal_access(handle, bucket->bu_inode,
 288                                           bucket->bu_bhs[i], type);
 289                 if (rc) {
 290                         mlog_errno(rc);
 291                         break;
 292                 }
 293         }
 294
 295         return rc;
 296 }
 297
 298 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
 299                                              struct ocfs2_xattr_bucket *bucket)
 300 {
 301         int i;
 302
 303         for (i = 0; i < bucket->bu_blocks; i++)
 304                 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
 305 }
 306
 307 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
 308                                          struct ocfs2_xattr_bucket *src)
 309 {
 310         int i;
 311         int blocksize = src->bu_inode->i_sb->s_blocksize;
 312
 313         BUG_ON(dest->bu_blocks != src->bu_blocks);
 314         BUG_ON(dest->bu_inode != src->bu_inode);
 315
 316         for (i = 0; i < src->bu_blocks; i++) {
 317                 memcpy(bucket_block(dest, i), bucket_block(src, i),
 318                        blocksize);
 319         }
 320 }
 321
 322 static int ocfs2_validate_xattr_block(struct super_block *sb,
 323                                       struct buffer_head *bh)
 324 {
 325         struct ocfs2_xattr_block *xb =
 326                 (struct ocfs2_xattr_block *)bh->b_data;
 327
 328         mlog(0, "Validating xattr block %llu\n",
 329              (unsigned long long)bh->b_blocknr);
 330
 331         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
 332                 ocfs2_error(sb,
 333                             "Extended attribute block #%llu has bad "
 334                             "signature %.*s",
 335                             (unsigned long long)bh->b_blocknr, 7,
 336                             xb->xb_signature);
 337                 return -EINVAL;
 338         }
 339
 340         if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
 341                 ocfs2_error(sb,
 342                             "Extended attribute block #%llu has an "
 343                             "invalid xb_blkno of %llu",
 344                             (unsigned long long)bh->b_blocknr,
 345                             (unsigned long long)le64_to_cpu(xb->xb_blkno));
 346                 return -EINVAL;
 347         }
 348
 349         if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
 350                 ocfs2_error(sb,
 351                             "Extended attribute block #%llu has an invalid "
 352                             "xb_fs_generation of #%u",
 353                             (unsigned long long)bh->b_blocknr,
 354                             le32_to_cpu(xb->xb_fs_generation));
 355                 return -EINVAL;
 356         }
 357
 358         return 0;
 359 }
 360
 361 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
 362                                   struct buffer_head **bh)
 363 {
 364         int rc;
 365         struct buffer_head *tmp = *bh;
 366
 367         rc = ocfs2_read_block(inode, xb_blkno, &tmp,
 368                               ocfs2_validate_xattr_block);
 369
 370         /* If ocfs2_read_block() got us a new bh, pass it up. */
 371         if (!rc && !*bh)
 372                 *bh = tmp;
 373
 374         return rc;
 375 }
 376
 377 static inline const char *ocfs2_xattr_prefix(int name_index)
 378 {
 379         struct xattr_handler *handler = NULL;
 380
 381         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
 382                 handler = ocfs2_xattr_handler_map[name_index];
 383
 384         return handler ? handler->prefix : NULL;
 385 }
 386
 387 static u32 ocfs2_xattr_name_hash(struct inode *inode,
 388                                  const char *name,
 389                                  int name_len)
 390 {
 391         /* Get hash value of uuid from super block */
 392         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
 393         int i;
 394
 395         /* hash extended attribute name */
 396         for (i = 0; i < name_len; i++) {
 397                 hash = (hash << OCFS2_HASH_SHIFT) ^
 398                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 399                        *name++;
 400         }
 401
 402         return hash;
 403 }
 404
 405 /*
 406  * ocfs2_xattr_hash_entry()
 407  *
 408  * Compute the hash of an extended attribute.
 409  */
 410 static void ocfs2_xattr_hash_entry(struct inode *inode,
 411                                    struct ocfs2_xattr_header *header,
 412                                    struct ocfs2_xattr_entry *entry)
 413 {
 414         u32 hash = 0;
 415         char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
 416
 417         hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
 418         entry->xe_name_hash = cpu_to_le32(hash);
 419
 420         return;
 421 }
 422
 423 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
 424 {
 425         int size = 0;
 426
 427         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
 428                 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
 429         else
 430                 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 431         size += sizeof(struct ocfs2_xattr_entry);
 432
 433         return size;
 434 }
 435
 436 int ocfs2_calc_security_init(struct inode *dir,
 437                              struct ocfs2_security_xattr_info *si,
 438                              int *want_clusters,
 439                              int *xattr_credits,
 440                              struct ocfs2_alloc_context **xattr_ac)
 441 {
 442         int ret = 0;
 443         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 444         int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 445                                                  si->value_len);
 446
 447         /*
 448          * The max space of security xattr taken inline is
 449          * 256(name) + 80(value) + 16(entry) = 352 bytes,
 450          * So reserve one metadata block for it is ok.
 451          */
 452         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 453             s_size > OCFS2_XATTR_FREE_IN_IBODY) {
 454                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
 455                 if (ret) {
 456                         mlog_errno(ret);
 457                         return ret;
 458                 }
 459                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 460         }
 461
 462         /* reserve clusters for xattr value which will be set in B tree*/
 463         if (si->value_len > OCFS2_XATTR_INLINE_SIZE)
 464                 *want_clusters += ocfs2_clusters_for_bytes(dir->i_sb,
 465                                                            si->value_len);
 466         return ret;
 467 }
 468
 469 int ocfs2_calc_xattr_init(struct inode *dir,
 470                           struct buffer_head *dir_bh,
 471                           int mode,
 472                           struct ocfs2_security_xattr_info *si,
 473                           int *want_clusters,
 474                           int *xattr_credits,
 475                           struct ocfs2_alloc_context **xattr_ac)
 476 {
 477         int ret = 0;
 478         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 479         int s_size = 0;
 480         int a_size = 0;
 481         int acl_len = 0;
 482
 483         if (si->enable)
 484                 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 485                                                      si->value_len);
 486
 487         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
 488                 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
 489                                         OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
 490                                         "", NULL, 0);
 491                 if (acl_len > 0) {
 492                         a_size = ocfs2_xattr_entry_real_size(0, acl_len);
 493                         if (S_ISDIR(mode))
 494                                 a_size <<= 1;
 495                 } else if (acl_len != 0 && acl_len != -ENODATA) {
 496                         mlog_errno(ret);
 497                         return ret;
 498                 }
 499         }
 500
 501         if (!(s_size + a_size))
 502                 return ret;
 503
 504         /*
 505          * The max space of security xattr taken inline is
 506          * 256(name) + 80(value) + 16(entry) = 352 bytes,
 507          * The max space of acl xattr taken inline is
 508          * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
 509          * when blocksize = 512, may reserve one more cluser for
 510          * xattr bucket, otherwise reserve one metadata block
 511          * for them is ok.
 512          */
 513         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 514             (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
 515                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
 516                 if (ret) {
 517                         mlog_errno(ret);
 518                         return ret;
 519                 }
 520                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 521         }
 522
 523         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
 524             (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
 525                 *want_clusters += 1;
 526                 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
 527         }
 528
 529         /* reserve clusters for xattr value which will be set in B tree*/
 530         if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE)
 531                 *want_clusters += ocfs2_clusters_for_bytes(dir->i_sb,
 532                                                            si->value_len);
 533         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
 534             acl_len > OCFS2_XATTR_INLINE_SIZE) {
 535                 *want_clusters += ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
 536                 if (S_ISDIR(mode))
 537                         *want_clusters += ocfs2_clusters_for_bytes(dir->i_sb,
 538                                                                    acl_len);
 539         }
 540
 541         return ret;
 542 }
 543
 544 static int ocfs2_xattr_extend_allocation(struct inode *inode,
 545                                          u32 clusters_to_add,
 546                                          struct buffer_head *xattr_bh,
 547                                          struct ocfs2_xattr_value_root *xv,
 548                                          struct ocfs2_xattr_set_ctxt *ctxt)
 549 {
 550         int status = 0;
 551         handle_t *handle = ctxt->handle;
 552         enum ocfs2_alloc_restarted why;
 553         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 554         u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
 555         struct ocfs2_extent_tree et;
 556
 557         mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
 558
 559         ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
 560
 561         status = ocfs2_journal_access(handle, inode, xattr_bh,
 562                                       OCFS2_JOURNAL_ACCESS_WRITE);
 563         if (status < 0) {
 564                 mlog_errno(status);
 565                 goto leave;
 566         }
 567
 568         prev_clusters = le32_to_cpu(xv->xr_clusters);
 569         status = ocfs2_add_clusters_in_btree(osb,
 570                                              inode,
 571                                              &logical_start,
 572                                              clusters_to_add,
 573                                              0,
 574                                              &et,
 575                                              handle,
 576                                              ctxt->data_ac,
 577                                              ctxt->meta_ac,
 578                                              &why);
 579         if (status < 0) {
 580                 mlog_errno(status);
 581                 goto leave;
 582         }
 583
 584         status = ocfs2_journal_dirty(handle, xattr_bh);
 585         if (status < 0) {
 586                 mlog_errno(status);
 587                 goto leave;
 588         }
 589
 590         clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
 591
 592         /*
 593          * We should have already allocated enough space before the transaction,
 594          * so no need to restart.
 595          */
 596         BUG_ON(why != RESTART_NONE || clusters_to_add);
 597
 598 leave:
 599
 600         return status;
 601 }
 602
 603 static int __ocfs2_remove_xattr_range(struct inode *inode,
 604                                       struct buffer_head *root_bh,
 605                                       struct ocfs2_xattr_value_root *xv,
 606                                       u32 cpos, u32 phys_cpos, u32 len,
 607                                       struct ocfs2_xattr_set_ctxt *ctxt)
 608 {
 609         int ret;
 610         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 611         handle_t *handle = ctxt->handle;
 612         struct ocfs2_extent_tree et;
 613
 614         ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
 615
 616         ret = ocfs2_journal_access(handle, inode, root_bh,
 617                                    OCFS2_JOURNAL_ACCESS_WRITE);
 618         if (ret) {
 619                 mlog_errno(ret);
 620                 goto out;
 621         }
 622
 623         ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, ctxt->meta_ac,
 624                                   &ctxt->dealloc);
 625         if (ret) {
 626                 mlog_errno(ret);
 627                 goto out;
 628         }
 629
 630         le32_add_cpu(&xv->xr_clusters, -len);
 631
 632         ret = ocfs2_journal_dirty(handle, root_bh);
 633         if (ret) {
 634                 mlog_errno(ret);
 635                 goto out;
 636         }
 637
 638         ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc, phys_blkno, len);
 639         if (ret)
 640                 mlog_errno(ret);
 641
 642 out:
 643         return ret;
 644 }
 645
 646 static int ocfs2_xattr_shrink_size(struct inode *inode,
 647                                    u32 old_clusters,
 648                                    u32 new_clusters,
 649                                    struct buffer_head *root_bh,
 650                                    struct ocfs2_xattr_value_root *xv,
 651                                    struct ocfs2_xattr_set_ctxt *ctxt)
 652 {
 653         int ret = 0;
 654         u32 trunc_len, cpos, phys_cpos, alloc_size;
 655         u64 block;
 656
 657         if (old_clusters <= new_clusters)
 658                 return 0;
 659
 660         cpos = new_clusters;
 661         trunc_len = old_clusters - new_clusters;
 662         while (trunc_len) {
 663                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
 664                                                &alloc_size, &xv->xr_list);
 665                 if (ret) {
 666                         mlog_errno(ret);
 667                         goto out;
 668                 }
 669
 670                 if (alloc_size > trunc_len)
 671                         alloc_size = trunc_len;
 672
 673                 ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
 674                                                  phys_cpos, alloc_size,
 675                                                  ctxt);
 676                 if (ret) {
 677                         mlog_errno(ret);
 678                         goto out;
 679                 }
 680
 681                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 682                 ocfs2_remove_xattr_clusters_from_cache(inode, block,
 683                                                        alloc_size);
 684                 cpos += alloc_size;
 685                 trunc_len -= alloc_size;
 686         }
 687
 688 out:
 689         return ret;
 690 }
 691
 692 static int ocfs2_xattr_value_truncate(struct inode *inode,
 693                                       struct buffer_head *root_bh,
 694                                       struct ocfs2_xattr_value_root *xv,
 695                                       int len,
 696                                       struct ocfs2_xattr_set_ctxt *ctxt)
 697 {
 698         int ret;
 699         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
 700         u32 old_clusters = le32_to_cpu(xv->xr_clusters);
 701
 702         if (new_clusters == old_clusters)
 703                 return 0;
 704
 705         if (new_clusters > old_clusters)
 706                 ret = ocfs2_xattr_extend_allocation(inode,
 707                                                     new_clusters - old_clusters,
 708                                                     root_bh, xv, ctxt);
 709         else
 710                 ret = ocfs2_xattr_shrink_size(inode,
 711                                               old_clusters, new_clusters,
 712                                               root_bh, xv, ctxt);
 713
 714         return ret;
 715 }
 716
 717 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
 718                                   size_t *result, const char *prefix,
 719                                   const char *name, int name_len)
 720 {
 721         char *p = buffer + *result;
 722         int prefix_len = strlen(prefix);
 723         int total_len = prefix_len + name_len + 1;
 724
 725         *result += total_len;
 726
 727         /* we are just looking for how big our buffer needs to be */
 728         if (!size)
 729                 return 0;
 730
 731         if (*result > size)
 732                 return -ERANGE;
 733
 734         memcpy(p, prefix, prefix_len);
 735         memcpy(p + prefix_len, name, name_len);
 736         p[prefix_len + name_len] = '\0';
 737
 738         return 0;
 739 }
 740
 741 static int ocfs2_xattr_list_entries(struct inode *inode,
 742                                     struct ocfs2_xattr_header *header,
 743                                     char *buffer, size_t buffer_size)
 744 {
 745         size_t result = 0;
 746         int i, type, ret;
 747         const char *prefix, *name;
 748
 749         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
 750                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 751                 type = ocfs2_xattr_get_type(entry);
 752                 prefix = ocfs2_xattr_prefix(type);
 753
 754                 if (prefix) {
 755                         name = (const char *)header +
 756                                 le16_to_cpu(entry->xe_name_offset);
 757
 758                         ret = ocfs2_xattr_list_entry(buffer, buffer_size,
 759                                                      &result, prefix, name,
 760                                                      entry->xe_name_len);
 761                         if (ret)
 762                                 return ret;
 763                 }
 764         }
 765
 766         return result;
 767 }
 768
 769 static int ocfs2_xattr_ibody_list(struct inode *inode,
 770                                   struct ocfs2_dinode *di,
 771                                   char *buffer,
 772                                   size_t buffer_size)
 773 {
 774         struct ocfs2_xattr_header *header = NULL;
 775         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 776         int ret = 0;
 777
 778         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 779                 return ret;
 780
 781         header = (struct ocfs2_xattr_header *)
 782                  ((void *)di + inode->i_sb->s_blocksize -
 783                  le16_to_cpu(di->i_xattr_inline_size));
 784
 785         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
 786
 787         return ret;
 788 }
 789
 790 static int ocfs2_xattr_block_list(struct inode *inode,
 791                                   struct ocfs2_dinode *di,
 792                                   char *buffer,
 793                                   size_t buffer_size)
 794 {
 795         struct buffer_head *blk_bh = NULL;
 796         struct ocfs2_xattr_block *xb;
 797         int ret = 0;
 798
 799         if (!di->i_xattr_loc)
 800                 return ret;
 801
 802         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
 803                                      &blk_bh);
 804         if (ret < 0) {
 805                 mlog_errno(ret);
 806                 return ret;
 807         }
 808
 809         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 810         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 811                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
 812                 ret = ocfs2_xattr_list_entries(inode, header,
 813                                                buffer, buffer_size);
 814         } else {
 815                 struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
 816                 ret = ocfs2_xattr_tree_list_index_block(inode, xt,
 817                                                    buffer, buffer_size);
 818         }
 819
 820         brelse(blk_bh);
 821
 822         return ret;
 823 }
 824
 825 ssize_t ocfs2_listxattr(struct dentry *dentry,
 826                         char *buffer,
 827                         size_t size)
 828 {
 829         int ret = 0, i_ret = 0, b_ret = 0;
 830         struct buffer_head *di_bh = NULL;
 831         struct ocfs2_dinode *di = NULL;
 832         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
 833
 834         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
 835                 return -EOPNOTSUPP;
 836
 837         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 838                 return ret;
 839
 840         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
 841         if (ret < 0) {
 842                 mlog_errno(ret);
 843                 return ret;
 844         }
 845
 846         di = (struct ocfs2_dinode *)di_bh->b_data;
 847
 848         down_read(&oi->ip_xattr_sem);
 849         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
 850         if (i_ret < 0)
 851                 b_ret = 0;
 852         else {
 853                 if (buffer) {
 854                         buffer += i_ret;
 855                         size -= i_ret;
 856                 }
 857                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
 858                                                buffer, size);
 859                 if (b_ret < 0)
 860                         i_ret = 0;
 861         }
 862         up_read(&oi->ip_xattr_sem);
 863         ocfs2_inode_unlock(dentry->d_inode, 0);
 864
 865         brelse(di_bh);
 866
 867         return i_ret + b_ret;
 868 }
 869
 870 static int ocfs2_xattr_find_entry(int name_index,
 871                                   const char *name,
 872                                   struct ocfs2_xattr_search *xs)
 873 {
 874         struct ocfs2_xattr_entry *entry;
 875         size_t name_len;
 876         int i, cmp = 1;
 877
 878         if (name == NULL)
 879                 return -EINVAL;
 880
 881         name_len = strlen(name);
 882         entry = xs->here;
 883         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
 884                 cmp = name_index - ocfs2_xattr_get_type(entry);
 885                 if (!cmp)
 886                         cmp = name_len - entry->xe_name_len;
 887                 if (!cmp)
 888                         cmp = memcmp(name, (xs->base +
 889                                      le16_to_cpu(entry->xe_name_offset)),
 890                                      name_len);
 891                 if (cmp == 0)
 892                         break;
 893                 entry += 1;
 894         }
 895         xs->here = entry;
 896
 897         return cmp ? -ENODATA : 0;
 898 }
 899
 900 static int ocfs2_xattr_get_value_outside(struct inode *inode,
 901                                          struct ocfs2_xattr_value_root *xv,
 902                                          void *buffer,
 903                                          size_t len)
 904 {
 905         u32 cpos, p_cluster, num_clusters, bpc, clusters;
 906         u64 blkno;
 907         int i, ret = 0;
 908         size_t cplen, blocksize;
 909         struct buffer_head *bh = NULL;
 910         struct ocfs2_extent_list *el;
 911
 912         el = &xv->xr_list;
 913         clusters = le32_to_cpu(xv->xr_clusters);
 914         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 915         blocksize = inode->i_sb->s_blocksize;
 916
 917         cpos = 0;
 918         while (cpos < clusters) {
 919                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 920                                                &num_clusters, el);
 921                 if (ret) {
 922                         mlog_errno(ret);
 923                         goto out;
 924                 }
 925
 926                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
 927                 /* Copy ocfs2_xattr_value */
 928                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
 929                         ret = ocfs2_read_block(inode, blkno, &bh, NULL);
 930                         if (ret) {
 931                                 mlog_errno(ret);
 932                                 goto out;
 933                         }
 934
 935                         cplen = len >= blocksize ? blocksize : len;
 936                         memcpy(buffer, bh->b_data, cplen);
 937                         len -= cplen;
 938                         buffer += cplen;
 939
 940                         brelse(bh);
 941                         bh = NULL;
 942                         if (len == 0)
 943                                 break;
 944                 }
 945                 cpos += num_clusters;
 946         }
 947 out:
 948         return ret;
 949 }
 950
 951 static int ocfs2_xattr_ibody_get(struct inode *inode,
 952                                  int name_index,
 953                                  const char *name,
 954                                  void *buffer,
 955                                  size_t buffer_size,
 956                                  struct ocfs2_xattr_search *xs)
 957 {
 958         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 959         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
 960         struct ocfs2_xattr_value_root *xv;
 961         size_t size;
 962         int ret = 0;
 963
 964         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 965                 return -ENODATA;
 966
 967         xs->end = (void *)di + inode->i_sb->s_blocksize;
 968         xs->header = (struct ocfs2_xattr_header *)
 969                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
 970         xs->base = (void *)xs->header;
 971         xs->here = xs->header->xh_entries;
 972
 973         ret = ocfs2_xattr_find_entry(name_index, name, xs);
 974         if (ret)
 975                 return ret;
 976         size = le64_to_cpu(xs->here->xe_value_size);
 977         if (buffer) {
 978                 if (size > buffer_size)
 979                         return -ERANGE;
 980                 if (ocfs2_xattr_is_local(xs->here)) {
 981                         memcpy(buffer, (void *)xs->base +
 982                                le16_to_cpu(xs->here->xe_name_offset) +
 983                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
 984                 } else {
 985                         xv = (struct ocfs2_xattr_value_root *)
 986                                 (xs->base + le16_to_cpu(
 987                                  xs->here->xe_name_offset) +
 988                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
 989                         ret = ocfs2_xattr_get_value_outside(inode, xv,
 990                                                             buffer, size);
 991                         if (ret < 0) {
 992                                 mlog_errno(ret);
 993                                 return ret;
 994                         }
 995                 }
 996         }
 997
 998         return size;
 999 }
1000
1001 static int ocfs2_xattr_block_get(struct inode *inode,
1002                                  int name_index,
1003                                  const char *name,
1004                                  void *buffer,
1005                                  size_t buffer_size,
1006                                  struct ocfs2_xattr_search *xs)
1007 {
1008         struct ocfs2_xattr_block *xb;
1009         struct ocfs2_xattr_value_root *xv;
1010         size_t size;
1011         int ret = -ENODATA, name_offset, name_len, block_off, i;
1012
1013         xs->bucket = ocfs2_xattr_bucket_new(inode);
1014         if (!xs->bucket) {
1015                 ret = -ENOMEM;
1016                 mlog_errno(ret);
1017                 goto cleanup;
1018         }
1019
1020         ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1021         if (ret) {
1022                 mlog_errno(ret);
1023                 goto cleanup;
1024         }
1025
1026         if (xs->not_found) {
1027                 ret = -ENODATA;
1028                 goto cleanup;
1029         }
1030
1031         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1032         size = le64_to_cpu(xs->here->xe_value_size);
1033         if (buffer) {
1034                 ret = -ERANGE;
1035                 if (size > buffer_size)
1036                         goto cleanup;
1037
1038                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1039                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1040                 i = xs->here - xs->header->xh_entries;
1041
1042                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1043                         ret = ocfs2_xattr_bucket_get_name_value(inode,
1044                                                                 bucket_xh(xs->bucket),
1045                                                                 i,
1046                                                                 &block_off,
1047                                                                 &name_offset);
1048                         xs->base = bucket_block(xs->bucket, block_off);
1049                 }
1050                 if (ocfs2_xattr_is_local(xs->here)) {
1051                         memcpy(buffer, (void *)xs->base +
1052                                name_offset + name_len, size);
1053                 } else {
1054                         xv = (struct ocfs2_xattr_value_root *)
1055                                 (xs->base + name_offset + name_len);
1056                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1057                                                             buffer, size);
1058                         if (ret < 0) {
1059                                 mlog_errno(ret);
1060                                 goto cleanup;
1061                         }
1062                 }
1063         }
1064         ret = size;
1065 cleanup:
1066         ocfs2_xattr_bucket_free(xs->bucket);
1067
1068         brelse(xs->xattr_bh);
1069         xs->xattr_bh = NULL;
1070         return ret;
1071 }
1072
1073 int ocfs2_xattr_get_nolock(struct inode *inode,
1074                            struct buffer_head *di_bh,
1075                            int name_index,
1076                            const char *name,
1077                            void *buffer,
1078                            size_t buffer_size)
1079 {
1080         int ret;
1081         struct ocfs2_dinode *di = NULL;
1082         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1083         struct ocfs2_xattr_search xis = {
1084                 .not_found = -ENODATA,
1085         };
1086         struct ocfs2_xattr_search xbs = {
1087                 .not_found = -ENODATA,
1088         };
1089
1090         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1091                 return -EOPNOTSUPP;
1092
1093         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1094                 ret = -ENODATA;
1095
1096         xis.inode_bh = xbs.inode_bh = di_bh;
1097         di = (struct ocfs2_dinode *)di_bh->b_data;
1098
1099         down_read(&oi->ip_xattr_sem);
1100         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1101                                     buffer_size, &xis);
1102         if (ret == -ENODATA && di->i_xattr_loc)
1103                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1104                                             buffer_size, &xbs);
1105         up_read(&oi->ip_xattr_sem);
1106
1107         return ret;
1108 }
1109
1110 /* ocfs2_xattr_get()
1111  *
1112  * Copy an extended attribute into the buffer provided.
1113  * Buffer is NULL to compute the size of buffer required.
1114  */
1115 static int ocfs2_xattr_get(struct inode *inode,
1116                            int name_index,
1117                            const char *name,
1118                            void *buffer,
1119                            size_t buffer_size)
1120 {
1121         int ret;
1122         struct buffer_head *di_bh = NULL;
1123
1124         ret = ocfs2_inode_lock(inode, &di_bh, 0);
1125         if (ret < 0) {
1126                 mlog_errno(ret);
1127                 return ret;
1128         }
1129         ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1130                                      name, buffer, buffer_size);
1131
1132         ocfs2_inode_unlock(inode, 0);
1133
1134         brelse(di_bh);
1135
1136         return ret;
1137 }
1138
1139 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1140                                            handle_t *handle,
1141                                            struct ocfs2_xattr_value_root *xv,
1142                                            const void *value,
1143                                            int value_len)
1144 {
1145         int ret = 0, i, cp_len, credits;
1146         u16 blocksize = inode->i_sb->s_blocksize;
1147         u32 p_cluster, num_clusters;
1148         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1149         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1150         u64 blkno;
1151         struct buffer_head *bh = NULL;
1152
1153         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1154
1155         /*
1156          * In __ocfs2_xattr_set_value_outside has already been dirtied,
1157          * so we don't need to worry about whether ocfs2_extend_trans
1158          * will create a new transactio for us or not.
1159          */
1160         credits = clusters * bpc;
1161         ret = ocfs2_extend_trans(handle, credits);
1162         if (ret) {
1163                 mlog_errno(ret);
1164                 goto out;
1165         }
1166
1167         while (cpos < clusters) {
1168                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1169                                                &num_clusters, &xv->xr_list);
1170                 if (ret) {
1171                         mlog_errno(ret);
1172                         goto out;
1173                 }
1174
1175                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1176
1177                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1178                         ret = ocfs2_read_block(inode, blkno, &bh, NULL);
1179                         if (ret) {
1180                                 mlog_errno(ret);
1181                                 goto out;
1182                         }
1183
1184                         ret = ocfs2_journal_access(handle,
1185                                                    inode,
1186                                                    bh,
1187                                                    OCFS2_JOURNAL_ACCESS_WRITE);
1188                         if (ret < 0) {
1189                                 mlog_errno(ret);
1190                                 goto out;
1191                         }
1192
1193                         cp_len = value_len > blocksize ? blocksize : value_len;
1194                         memcpy(bh->b_data, value, cp_len);
1195                         value_len -= cp_len;
1196                         value += cp_len;
1197                         if (cp_len < blocksize)
1198                                 memset(bh->b_data + cp_len, 0,
1199                                        blocksize - cp_len);
1200
1201                         ret = ocfs2_journal_dirty(handle, bh);
1202                         if (ret < 0) {
1203                                 mlog_errno(ret);
1204                                 goto out;
1205                         }
1206                         brelse(bh);
1207                         bh = NULL;
1208
1209                         /*
1210                          * XXX: do we need to empty all the following
1211                          * blocks in this cluster?
1212                          */
1213                         if (!value_len)
1214                                 break;
1215                 }
1216                 cpos += num_clusters;
1217         }
1218 out:
1219         brelse(bh);
1220
1221         return ret;
1222 }
1223
1224 static int ocfs2_xattr_cleanup(struct inode *inode,
1225                                handle_t *handle,
1226                                struct ocfs2_xattr_info *xi,
1227                                struct ocfs2_xattr_search *xs,
1228                                size_t offs)
1229 {
1230         int ret = 0;
1231         size_t name_len = strlen(xi->name);
1232         void *val = xs->base + offs;
1233         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1234
1235         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1236                                    OCFS2_JOURNAL_ACCESS_WRITE);
1237         if (ret) {
1238                 mlog_errno(ret);
1239                 goto out;
1240         }
1241         /* Decrease xattr count */
1242         le16_add_cpu(&xs->header->xh_count, -1);
1243         /* Remove the xattr entry and tree root which has already be set*/
1244         memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
1245         memset(val, 0, size);
1246
1247         ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1248         if (ret < 0)
1249                 mlog_errno(ret);
1250 out:
1251         return ret;
1252 }
1253
1254 static int ocfs2_xattr_update_entry(struct inode *inode,
1255                                     handle_t *handle,
1256                                     struct ocfs2_xattr_info *xi,
1257                                     struct ocfs2_xattr_search *xs,
1258                                     size_t offs)
1259 {
1260         int ret;
1261
1262         ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1263                                    OCFS2_JOURNAL_ACCESS_WRITE);
1264         if (ret) {
1265                 mlog_errno(ret);
1266                 goto out;
1267         }
1268
1269         xs->here->xe_name_offset = cpu_to_le16(offs);
1270         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1271         if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1272                 ocfs2_xattr_set_local(xs->here, 1);
1273         else
1274                 ocfs2_xattr_set_local(xs->here, 0);
1275         ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1276
1277         ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1278         if (ret < 0)
1279                 mlog_errno(ret);
1280 out:
1281         return ret;
1282 }
1283
1284 /*
1285  * ocfs2_xattr_set_value_outside()
1286  *
1287  * Set large size value in B tree.
1288  */
1289 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1290                                          struct ocfs2_xattr_info *xi,
1291                                          struct ocfs2_xattr_search *xs,
1292                                          struct ocfs2_xattr_set_ctxt *ctxt,
1293                                          size_t offs)
1294 {
1295         size_t name_len = strlen(xi->name);
1296         void *val = xs->base + offs;
1297         struct ocfs2_xattr_value_root *xv = NULL;
1298         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1299         int ret = 0;
1300
1301         memset(val, 0, size);
1302         memcpy(val, xi->name, name_len);
1303         xv = (struct ocfs2_xattr_value_root *)
1304                 (val + OCFS2_XATTR_SIZE(name_len));
1305         xv->xr_clusters = 0;
1306         xv->xr_last_eb_blk = 0;
1307         xv->xr_list.l_tree_depth = 0;
1308         xv->xr_list.l_count = cpu_to_le16(1);
1309         xv->xr_list.l_next_free_rec = 0;
1310
1311         ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
1312                                          xi->value_len, ctxt);
1313         if (ret < 0) {
1314                 mlog_errno(ret);
1315                 return ret;
1316         }
1317         ret = ocfs2_xattr_update_entry(inode, ctxt->handle, xi, xs, offs);
1318         if (ret < 0) {
1319                 mlog_errno(ret);
1320                 return ret;
1321         }
1322         ret = __ocfs2_xattr_set_value_outside(inode, ctxt->handle, xv,
1323                                               xi->value, xi->value_len);
1324         if (ret < 0)
1325                 mlog_errno(ret);
1326
1327         return ret;
1328 }
1329
1330 /*
1331  * ocfs2_xattr_set_entry_local()
1332  *
1333  * Set, replace or remove extended attribute in local.
1334  */
1335 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1336                                         struct ocfs2_xattr_info *xi,
1337                                         struct ocfs2_xattr_search *xs,
1338                                         struct ocfs2_xattr_entry *last,
1339                                         size_t min_offs)
1340 {
1341         size_t name_len = strlen(xi->name);
1342         int i;
1343
1344         if (xi->value && xs->not_found) {
1345                 /* Insert the new xattr entry. */
1346                 le16_add_cpu(&xs->header->xh_count, 1);
1347                 ocfs2_xattr_set_type(last, xi->name_index);
1348                 ocfs2_xattr_set_local(last, 1);
1349                 last->xe_name_len = name_len;
1350         } else {
1351                 void *first_val;
1352                 void *val;
1353                 size_t offs, size;
1354
1355                 first_val = xs->base + min_offs;
1356                 offs = le16_to_cpu(xs->here->xe_name_offset);
1357                 val = xs->base + offs;
1358
1359                 if (le64_to_cpu(xs->here->xe_value_size) >
1360                     OCFS2_XATTR_INLINE_SIZE)
1361                         size = OCFS2_XATTR_SIZE(name_len) +
1362                                 OCFS2_XATTR_ROOT_SIZE;
1363                 else
1364                         size = OCFS2_XATTR_SIZE(name_len) +
1365                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1366
1367                 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1368                                 OCFS2_XATTR_SIZE(xi->value_len)) {
1369                         /* The old and the new value have the
1370                            same size. Just replace the value. */
1371                         ocfs2_xattr_set_local(xs->here, 1);
1372                         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1373                         /* Clear value bytes. */
1374                         memset(val + OCFS2_XATTR_SIZE(name_len),
1375                                0,
1376                                OCFS2_XATTR_SIZE(xi->value_len));
1377                         memcpy(val + OCFS2_XATTR_SIZE(name_len),
1378                                xi->value,
1379                                xi->value_len);
1380                         return;
1381                 }
1382                 /* Remove the old name+value. */
1383                 memmove(first_val + size, first_val, val - first_val);
1384                 memset(first_val, 0, size);
1385                 xs->here->xe_name_hash = 0;
1386                 xs->here->xe_name_offset = 0;
1387                 ocfs2_xattr_set_local(xs->here, 1);
1388                 xs->here->xe_value_size = 0;
1389
1390                 min_offs += size;
1391
1392                 /* Adjust all value offsets. */
1393                 last = xs->header->xh_entries;
1394                 for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1395                         size_t o = le16_to_cpu(last->xe_name_offset);
1396
1397                         if (o < offs)
1398                                 last->xe_name_offset = cpu_to_le16(o + size);
1399                         last += 1;
1400                 }
1401
1402                 if (!xi->value) {
1403                         /* Remove the old entry. */
1404                         last -= 1;
1405                         memmove(xs->here, xs->here + 1,
1406                                 (void *)last - (void *)xs->here);
1407                         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1408                         le16_add_cpu(&xs->header->xh_count, -1);
1409                 }
1410         }
1411         if (xi->value) {
1412                 /* Insert the new name+value. */
1413                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1414                                 OCFS2_XATTR_SIZE(xi->value_len);
1415                 void *val = xs->base + min_offs - size;
1416
1417                 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1418                 memset(val, 0, size);
1419                 memcpy(val, xi->name, name_len);
1420                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1421                        xi->value,
1422                        xi->value_len);
1423                 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1424                 ocfs2_xattr_set_local(xs->here, 1);
1425                 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1426         }
1427
1428         return;
1429 }
1430
1431 /*
1432  * ocfs2_xattr_set_entry()
1433  *
1434  * Set extended attribute entry into inode or block.
1435  *
1436  * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1437  * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1438  * then set value in B tree with set_value_outside().
1439  */
1440 static int ocfs2_xattr_set_entry(struct inode *inode,
1441                                  struct ocfs2_xattr_info *xi,
1442                                  struct ocfs2_xattr_search *xs,
1443                                  struct ocfs2_xattr_set_ctxt *ctxt,
1444                                  int flag)
1445 {
1446         struct ocfs2_xattr_entry *last;
1447         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1448         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1449         size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1450         size_t size_l = 0;
1451         handle_t *handle = ctxt->handle;
1452         int free, i, ret;
1453         struct ocfs2_xattr_info xi_l = {
1454                 .name_index = xi->name_index,
1455                 .name = xi->name,
1456                 .value = xi->value,
1457                 .value_len = xi->value_len,
1458         };
1459
1460         /* Compute min_offs, last and free space. */
1461         last = xs->header->xh_entries;
1462
1463         for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1464                 size_t offs = le16_to_cpu(last->xe_name_offset);
1465                 if (offs < min_offs)
1466                         min_offs = offs;
1467                 last += 1;
1468         }
1469
1470         free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
1471         if (free < 0)
1472                 return -EIO;
1473
1474         if (!xs->not_found) {
1475                 size_t size = 0;
1476                 if (ocfs2_xattr_is_local(xs->here))
1477                         size = OCFS2_XATTR_SIZE(name_len) +
1478                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1479                 else
1480                         size = OCFS2_XATTR_SIZE(name_len) +
1481                                 OCFS2_XATTR_ROOT_SIZE;
1482                 free += (size + sizeof(struct ocfs2_xattr_entry));
1483         }
1484         /* Check free space in inode or block */
1485         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1486                 if (free < sizeof(struct ocfs2_xattr_entry) +
1487                            OCFS2_XATTR_SIZE(name_len) +
1488                            OCFS2_XATTR_ROOT_SIZE) {
1489                         ret = -ENOSPC;
1490                         goto out;
1491                 }
1492                 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1493                 xi_l.value = (void *)&def_xv;
1494                 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1495         } else if (xi->value) {
1496                 if (free < sizeof(struct ocfs2_xattr_entry) +
1497                            OCFS2_XATTR_SIZE(name_len) +
1498                            OCFS2_XATTR_SIZE(xi->value_len)) {
1499                         ret = -ENOSPC;
1500                         goto out;
1501                 }
1502         }
1503
1504         if (!xs->not_found) {
1505                 /* For existing extended attribute */
1506                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1507                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1508                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1509                 void *val = xs->base + offs;
1510
1511                 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1512                         /* Replace existing local xattr with tree root */
1513                         ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1514                                                             ctxt, offs);
1515                         if (ret < 0)
1516                                 mlog_errno(ret);
1517                         goto out;
1518                 } else if (!ocfs2_xattr_is_local(xs->here)) {
1519                         /* For existing xattr which has value outside */
1520                         struct ocfs2_xattr_value_root *xv = NULL;
1521                         xv = (struct ocfs2_xattr_value_root *)(val +
1522                                 OCFS2_XATTR_SIZE(name_len));
1523
1524                         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1525                                 /*
1526                                  * If new value need set outside also,
1527                                  * first truncate old value to new value,
1528                                  * then set new value with set_value_outside().
1529                                  */
1530                                 ret = ocfs2_xattr_value_truncate(inode,
1531                                                                  xs->xattr_bh,
1532                                                                  xv,
1533                                                                  xi->value_len,
1534                                                                  ctxt);
1535                                 if (ret < 0) {
1536                                         mlog_errno(ret);
1537                                         goto out;
1538                                 }
1539
1540                                 ret = ocfs2_xattr_update_entry(inode,
1541                                                                handle,
1542                                                                xi,
1543                                                                xs,
1544                                                                offs);
1545                                 if (ret < 0) {
1546                                         mlog_errno(ret);
1547                                         goto out;
1548                                 }
1549
1550                                 ret = __ocfs2_xattr_set_value_outside(inode,
1551                                                                 handle,
1552                                                                 xv,
1553                                                                 xi->value,
1554                                                                 xi->value_len);
1555                                 if (ret < 0)
1556                                         mlog_errno(ret);
1557                                 goto out;
1558                         } else {
1559                                 /*
1560                                  * If new value need set in local,
1561                                  * just trucate old value to zero.
1562                                  */
1563                                  ret = ocfs2_xattr_value_truncate(inode,
1564                                                                   xs->xattr_bh,
1565                                                                   xv,
1566                                                                   0,
1567                                                                   ctxt);
1568                                 if (ret < 0)
1569                                         mlog_errno(ret);
1570                         }
1571                 }
1572         }
1573
1574         ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
1575                                    OCFS2_JOURNAL_ACCESS_WRITE);
1576         if (ret) {
1577                 mlog_errno(ret);
1578                 goto out;
1579         }
1580
1581         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1582                 ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
1583                                            OCFS2_JOURNAL_ACCESS_WRITE);
1584                 if (ret) {
1585                         mlog_errno(ret);
1586                         goto out;
1587                 }
1588         }
1589
1590         /*
1591          * Set value in local, include set tree root in local.
1592          * This is the first step for value size >INLINE_SIZE.
1593          */
1594         ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1595
1596         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1597                 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1598                 if (ret < 0) {
1599                         mlog_errno(ret);
1600                         goto out;
1601                 }
1602         }
1603
1604         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1605             (flag & OCFS2_INLINE_XATTR_FL)) {
1606                 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1607                 unsigned int xattrsize = osb->s_xattr_inline_size;
1608
1609                 /*
1610                  * Adjust extent record count or inline data size
1611                  * to reserve space for extended attribute.
1612                  */
1613                 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1614                         struct ocfs2_inline_data *idata = &di->id2.i_data;
1615                         le16_add_cpu(&idata->id_count, -xattrsize);
1616                 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1617                         struct ocfs2_extent_list *el = &di->id2.i_list;
1618                         le16_add_cpu(&el->l_count, -(xattrsize /
1619                                         sizeof(struct ocfs2_extent_rec)));
1620                 }
1621                 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1622         }
1623         /* Update xattr flag */
1624         spin_lock(&oi->ip_lock);
1625         oi->ip_dyn_features |= flag;
1626         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1627         spin_unlock(&oi->ip_lock);
1628         /* Update inode ctime */
1629         inode->i_ctime = CURRENT_TIME;
1630         di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1631         di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1632
1633         ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1634         if (ret < 0)
1635                 mlog_errno(ret);
1636
1637         if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1638                 /*
1639                  * Set value outside in B tree.
1640                  * This is the second step for value size > INLINE_SIZE.
1641                  */
1642                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1643                 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, ctxt, offs);
1644                 if (ret < 0) {
1645                         int ret2;
1646
1647                         mlog_errno(ret);
1648                         /*
1649                          * If set value outside failed, we have to clean
1650                          * the junk tree root we have already set in local.
1651                          */
1652                         ret2 = ocfs2_xattr_cleanup(inode, ctxt->handle,
1653                                                    xi, xs, offs);
1654                         if (ret2 < 0)
1655                                 mlog_errno(ret2);
1656                 }
1657         }
1658 out:
1659         return ret;
1660 }
1661
1662 static int ocfs2_remove_value_outside(struct inode*inode,
1663                                       struct buffer_head *bh,
1664                                       struct ocfs2_xattr_header *header)
1665 {
1666         int ret = 0, i;
1667         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1668         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
1669
1670         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
1671
1672         ctxt.handle = ocfs2_start_trans(osb,
1673                                         ocfs2_remove_extent_credits(osb->sb));
1674         if (IS_ERR(ctxt.handle)) {
1675                 ret = PTR_ERR(ctxt.handle);
1676                 mlog_errno(ret);
1677                 goto out;
1678         }
1679
1680         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
1681                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
1682
1683                 if (!ocfs2_xattr_is_local(entry)) {
1684                         struct ocfs2_xattr_value_root *xv;
1685                         void *val;
1686
1687                         val = (void *)header +
1688                                 le16_to_cpu(entry->xe_name_offset);
1689                         xv = (struct ocfs2_xattr_value_root *)
1690                                 (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
1691                         ret = ocfs2_xattr_value_truncate(inode, bh, xv,
1692                                                          0, &ctxt);
1693                         if (ret < 0) {
1694                                 mlog_errno(ret);
1695                                 break;
1696                         }
1697                 }
1698         }
1699
1700         ocfs2_commit_trans(osb, ctxt.handle);
1701         ocfs2_schedule_truncate_log_flush(osb, 1);
1702         ocfs2_run_deallocs(osb, &ctxt.dealloc);
1703 out:
1704         return ret;
1705 }
1706
1707 static int ocfs2_xattr_ibody_remove(struct inode *inode,
1708                                     struct buffer_head *di_bh)
1709 {
1710
1711         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1712         struct ocfs2_xattr_header *header;
1713         int ret;
1714
1715         header = (struct ocfs2_xattr_header *)
1716                  ((void *)di + inode->i_sb->s_blocksize -
1717                  le16_to_cpu(di->i_xattr_inline_size));
1718
1719         ret = ocfs2_remove_value_outside(inode, di_bh, header);
1720
1721         return ret;
1722 }
1723
1724 static int ocfs2_xattr_block_remove(struct inode *inode,
1725                                     struct buffer_head *blk_bh)
1726 {
1727         struct ocfs2_xattr_block *xb;
1728         int ret = 0;
1729
1730         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1731         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1732                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
1733                 ret = ocfs2_remove_value_outside(inode, blk_bh, header);
1734         } else
1735                 ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
1736
1737         return ret;
1738 }
1739
1740 static int ocfs2_xattr_free_block(struct inode *inode,
1741                                   u64 block)
1742 {
1743         struct inode *xb_alloc_inode;
1744         struct buffer_head *xb_alloc_bh = NULL;
1745         struct buffer_head *blk_bh = NULL;
1746         struct ocfs2_xattr_block *xb;
1747         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1748         handle_t *handle;
1749         int ret = 0;
1750         u64 blk, bg_blkno;
1751         u16 bit;
1752
1753         ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
1754         if (ret < 0) {
1755                 mlog_errno(ret);
1756                 goto out;
1757         }
1758
1759         ret = ocfs2_xattr_block_remove(inode, blk_bh);
1760         if (ret < 0) {
1761                 mlog_errno(ret);
1762                 goto out;
1763         }
1764
1765         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1766         blk = le64_to_cpu(xb->xb_blkno);
1767         bit = le16_to_cpu(xb->xb_suballoc_bit);
1768         bg_blkno = ocfs2_which_suballoc_group(blk, bit);
1769
1770         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
1771                                 EXTENT_ALLOC_SYSTEM_INODE,
1772                                 le16_to_cpu(xb->xb_suballoc_slot));
1773         if (!xb_alloc_inode) {
1774                 ret = -ENOMEM;
1775                 mlog_errno(ret);
1776                 goto out;
1777         }
1778         mutex_lock(&xb_alloc_inode->i_mutex);
1779
1780         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
1781         if (ret < 0) {
1782                 mlog_errno(ret);
1783                 goto out_mutex;
1784         }
1785
1786         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
1787         if (IS_ERR(handle)) {
1788                 ret = PTR_ERR(handle);
1789                 mlog_errno(ret);
1790                 goto out_unlock;
1791         }
1792
1793         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
1794                                        bit, bg_blkno, 1);
1795         if (ret < 0)
1796                 mlog_errno(ret);
1797
1798         ocfs2_commit_trans(osb, handle);
1799 out_unlock:
1800         ocfs2_inode_unlock(xb_alloc_inode, 1);
1801         brelse(xb_alloc_bh);
1802 out_mutex:
1803         mutex_unlock(&xb_alloc_inode->i_mutex);
1804         iput(xb_alloc_inode);
1805 out:
1806         brelse(blk_bh);
1807         return ret;
1808 }
1809
1810 /*
1811  * ocfs2_xattr_remove()
1812  *
1813  * Free extended attribute resources associated with this inode.
1814  */
1815 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
1816 {
1817         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1818         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1819         handle_t *handle;
1820         int ret;
1821
1822         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1823                 return 0;
1824
1825         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1826                 return 0;
1827
1828         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1829                 ret = ocfs2_xattr_ibody_remove(inode, di_bh);
1830                 if (ret < 0) {
1831                         mlog_errno(ret);
1832                         goto out;
1833                 }
1834         }
1835
1836         if (di->i_xattr_loc) {
1837                 ret = ocfs2_xattr_free_block(inode,
1838                                              le64_to_cpu(di->i_xattr_loc));
1839                 if (ret < 0) {
1840                         mlog_errno(ret);
1841                         goto out;
1842                 }
1843         }
1844
1845         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
1846                                    OCFS2_INODE_UPDATE_CREDITS);
1847         if (IS_ERR(handle)) {
1848                 ret = PTR_ERR(handle);
1849                 mlog_errno(ret);
1850                 goto out;
1851         }
1852         ret = ocfs2_journal_access(handle, inode, di_bh,
1853                                    OCFS2_JOURNAL_ACCESS_WRITE);
1854         if (ret) {
1855                 mlog_errno(ret);
1856                 goto out_commit;
1857         }
1858
1859         di->i_xattr_loc = 0;
1860
1861         spin_lock(&oi->ip_lock);
1862         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
1863         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1864         spin_unlock(&oi->ip_lock);
1865
1866         ret = ocfs2_journal_dirty(handle, di_bh);
1867         if (ret < 0)
1868                 mlog_errno(ret);
1869 out_commit:
1870         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
1871 out:
1872         return ret;
1873 }
1874
1875 static int ocfs2_xattr_has_space_inline(struct inode *inode,
1876                                         struct ocfs2_dinode *di)
1877 {
1878         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1879         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1880         int free;
1881
1882         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
1883                 return 0;
1884
1885         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1886                 struct ocfs2_inline_data *idata = &di->id2.i_data;
1887                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
1888         } else if (ocfs2_inode_is_fast_symlink(inode)) {
1889                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
1890                         le64_to_cpu(di->i_size);
1891         } else {
1892                 struct ocfs2_extent_list *el = &di->id2.i_list;
1893                 free = (le16_to_cpu(el->l_count) -
1894                         le16_to_cpu(el->l_next_free_rec)) *
1895                         sizeof(struct ocfs2_extent_rec);
1896         }
1897         if (free >= xattrsize)
1898                 return 1;
1899
1900         return 0;
1901 }
1902
1903 /*
1904  * ocfs2_xattr_ibody_find()
1905  *
1906  * Find extended attribute in inode block and
1907  * fill search info into struct ocfs2_xattr_search.
1908  */
1909 static int ocfs2_xattr_ibody_find(struct inode *inode,
1910                                   int name_index,
1911                                   const char *name,
1912                                   struct ocfs2_xattr_search *xs)
1913 {
1914         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1915         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1916         int ret;
1917         int has_space = 0;
1918
1919         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1920                 return 0;
1921
1922         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1923                 down_read(&oi->ip_alloc_sem);
1924                 has_space = ocfs2_xattr_has_space_inline(inode, di);
1925                 up_read(&oi->ip_alloc_sem);
1926                 if (!has_space)
1927                         return 0;
1928         }
1929
1930         xs->xattr_bh = xs->inode_bh;
1931         xs->end = (void *)di + inode->i_sb->s_blocksize;
1932         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1933                 xs->header = (struct ocfs2_xattr_header *)
1934                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1935         else
1936                 xs->header = (struct ocfs2_xattr_header *)
1937                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
1938         xs->base = (void *)xs->header;
1939         xs->here = xs->header->xh_entries;
1940
1941         /* Find the named attribute. */
1942         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
1943                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
1944                 if (ret && ret != -ENODATA)
1945                         return ret;
1946                 xs->not_found = ret;
1947         }
1948
1949         return 0;
1950 }
1951
1952 /*
1953  * ocfs2_xattr_ibody_set()
1954  *
1955  * Set, replace or remove an extended attribute into inode block.
1956  *
1957  */
1958 static int ocfs2_xattr_ibody_set(struct inode *inode,
1959                                  struct ocfs2_xattr_info *xi,
1960                                  struct ocfs2_xattr_search *xs,
1961                                  struct ocfs2_xattr_set_ctxt *ctxt)
1962 {
1963         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1964         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1965         int ret;
1966
1967         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
1968                 return -ENOSPC;
1969
1970         down_write(&oi->ip_alloc_sem);
1971         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
1972                 if (!ocfs2_xattr_has_space_inline(inode, di)) {
1973                         ret = -ENOSPC;
1974                         goto out;
1975                 }
1976         }
1977
1978         ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
1979                                 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
1980 out:
1981         up_write(&oi->ip_alloc_sem);
1982
1983         return ret;
1984 }
1985
1986 /*
1987  * ocfs2_xattr_block_find()
1988  *
1989  * Find extended attribute in external block and
1990  * fill search info into struct ocfs2_xattr_search.
1991  */
1992 static int ocfs2_xattr_block_find(struct inode *inode,
1993                                   int name_index,
1994                                   const char *name,
1995                                   struct ocfs2_xattr_search *xs)
1996 {
1997         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1998         struct buffer_head *blk_bh = NULL;
1999         struct ocfs2_xattr_block *xb;
2000         int ret = 0;
2001
2002         if (!di->i_xattr_loc)
2003                 return ret;
2004
2005         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2006                                      &blk_bh);
2007         if (ret < 0) {
2008                 mlog_errno(ret);
2009                 return ret;
2010         }
2011
2012         xs->xattr_bh = blk_bh;
2013         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2014
2015         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2016                 xs->header = &xb->xb_attrs.xb_header;
2017                 xs->base = (void *)xs->header;
2018                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2019                 xs->here = xs->header->xh_entries;
2020
2021                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2022         } else
2023                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2024                                                    name_index,
2025                                                    name, xs);
2026
2027         if (ret && ret != -ENODATA) {
2028                 xs->xattr_bh = NULL;
2029                 goto cleanup;
2030         }
2031         xs->not_found = ret;
2032         return 0;
2033 cleanup:
2034         brelse(blk_bh);
2035
2036         return ret;
2037 }
2038
2039 /*
2040  * ocfs2_xattr_block_set()
2041  *
2042  * Set, replace or remove an extended attribute into external block.
2043  *
2044  */
2045 static int ocfs2_xattr_block_set(struct inode *inode,
2046                                  struct ocfs2_xattr_info *xi,
2047                                  struct ocfs2_xattr_search *xs,
2048                                  struct ocfs2_xattr_set_ctxt *ctxt)
2049 {
2050         struct buffer_head *new_bh = NULL;
2051         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2052         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)xs->inode_bh->b_data;
2053         handle_t *handle = ctxt->handle;
2054         struct ocfs2_xattr_block *xblk = NULL;
2055         u16 suballoc_bit_start;
2056         u32 num_got;
2057         u64 first_blkno;
2058         int ret;
2059
2060         if (!xs->xattr_bh) {
2061                 ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
2062                                            OCFS2_JOURNAL_ACCESS_CREATE);
2063                 if (ret < 0) {
2064                         mlog_errno(ret);
2065                         goto end;
2066                 }
2067
2068                 ret = ocfs2_claim_metadata(osb, handle, ctxt->meta_ac, 1,
2069                                            &suballoc_bit_start, &num_got,
2070                                            &first_blkno);
2071                 if (ret < 0) {
2072                         mlog_errno(ret);
2073                         goto end;
2074                 }
2075
2076                 new_bh = sb_getblk(inode->i_sb, first_blkno);
2077                 ocfs2_set_new_buffer_uptodate(inode, new_bh);
2078
2079                 ret = ocfs2_journal_access(handle, inode, new_bh,
2080                                            OCFS2_JOURNAL_ACCESS_CREATE);
2081                 if (ret < 0) {
2082                         mlog_errno(ret);
2083                         goto end;
2084                 }
2085
2086                 /* Initialize ocfs2_xattr_block */
2087                 xs->xattr_bh = new_bh;
2088                 xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2089                 memset(xblk, 0, inode->i_sb->s_blocksize);
2090                 strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2091                 xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
2092                 xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2093                 xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
2094                 xblk->xb_blkno = cpu_to_le64(first_blkno);
2095
2096                 xs->header = &xblk->xb_attrs.xb_header;
2097                 xs->base = (void *)xs->header;
2098                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2099                 xs->here = xs->header->xh_entries;
2100
2101                 ret = ocfs2_journal_dirty(handle, new_bh);
2102                 if (ret < 0) {
2103                         mlog_errno(ret);
2104                         goto end;
2105                 }
2106                 di->i_xattr_loc = cpu_to_le64(first_blkno);
2107                 ocfs2_journal_dirty(handle, xs->inode_bh);
2108         } else
2109                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2110
2111         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2112                 /* Set extended attribute into external block */
2113                 ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2114                                             OCFS2_HAS_XATTR_FL);
2115                 if (!ret || ret != -ENOSPC)
2116                         goto end;
2117
2118                 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2119                 if (ret)
2120                         goto end;
2121         }
2122
2123         ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2124
2125 end:
2126
2127         return ret;
2128 }
2129
2130 /* Check whether the new xattr can be inserted into the inode. */
2131 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2132                                        struct ocfs2_xattr_info *xi,
2133                                        struct ocfs2_xattr_search *xs)
2134 {
2135         u64 value_size;
2136         struct ocfs2_xattr_entry *last;
2137         int free, i;
2138         size_t min_offs = xs->end - xs->base;
2139
2140         if (!xs->header)
2141                 return 0;
2142
2143         last = xs->header->xh_entries;
2144
2145         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2146                 size_t offs = le16_to_cpu(last->xe_name_offset);
2147                 if (offs < min_offs)
2148                         min_offs = offs;
2149                 last += 1;
2150         }
2151
2152         free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
2153         if (free < 0)
2154                 return 0;
2155
2156         BUG_ON(!xs->not_found);
2157
2158         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2159                 value_size = OCFS2_XATTR_ROOT_SIZE;
2160         else
2161                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
2162
2163         if (free >= sizeof(struct ocfs2_xattr_entry) +
2164                    OCFS2_XATTR_SIZE(strlen(xi->name)) + value_size)
2165                 return 1;
2166
2167         return 0;
2168 }
2169
2170 static int ocfs2_calc_xattr_set_need(struct inode *inode,
2171                                      struct ocfs2_dinode *di,
2172                                      struct ocfs2_xattr_info *xi,
2173                                      struct ocfs2_xattr_search *xis,
2174                                      struct ocfs2_xattr_search *xbs,
2175                                      int *clusters_need,
2176                                      int *meta_need,
2177                                      int *credits_need)
2178 {
2179         int ret = 0, old_in_xb = 0;
2180         int clusters_add = 0, meta_add = 0, credits = 0;
2181         struct buffer_head *bh = NULL;
2182         struct ocfs2_xattr_block *xb = NULL;
2183         struct ocfs2_xattr_entry *xe = NULL;
2184         struct ocfs2_xattr_value_root *xv = NULL;
2185         char *base = NULL;
2186         int name_offset, name_len = 0;
2187         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
2188                                                     xi->value_len);
2189         u64 value_size;
2190
2191         if (xis->not_found && xbs->not_found) {
2192                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2193
2194                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2195                         clusters_add += new_clusters;
2196                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2197                                                         &def_xv.xv.xr_list,
2198                                                         new_clusters);
2199                 }
2200
2201                 goto meta_guess;
2202         }
2203
2204         if (!xis->not_found) {
2205                 xe = xis->here;
2206                 name_offset = le16_to_cpu(xe->xe_name_offset);
2207                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2208                 base = xis->base;
2209                 credits += OCFS2_INODE_UPDATE_CREDITS;
2210         } else {
2211                 int i, block_off = 0;
2212                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2213                 xe = xbs->here;
2214                 name_offset = le16_to_cpu(xe->xe_name_offset);
2215                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2216                 i = xbs->here - xbs->header->xh_entries;
2217                 old_in_xb = 1;
2218
2219                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2220                         ret = ocfs2_xattr_bucket_get_name_value(inode,
2221                                                         bucket_xh(xbs->bucket),
2222                                                         i, &block_off,
2223                                                         &name_offset);
2224                         base = bucket_block(xbs->bucket, block_off);
2225                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2226                 } else {
2227                         base = xbs->base;
2228                         credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
2229                 }
2230         }
2231
2232         /*
2233          * delete a xattr doesn't need metadata and cluster allocation.
2234          * so just calculate the credits and return.
2235          *
2236          * The credits for removing the value tree will be extended
2237          * by ocfs2_remove_extent itself.
2238          */
2239         if (!xi->value) {
2240                 if (!ocfs2_xattr_is_local(xe))
2241                         credits += ocfs2_remove_extent_credits(inode->i_sb);
2242
2243                 goto out;
2244         }
2245
2246         /* do cluster allocation guess first. */
2247         value_size = le64_to_cpu(xe->xe_value_size);
2248
2249         if (old_in_xb) {
2250                 /*
2251                  * In xattr set, we always try to set the xe in inode first,
2252                  * so if it can be inserted into inode successfully, the old
2253                  * one will be removed from the xattr block, and this xattr
2254                  * will be inserted into inode as a new xattr in inode.
2255                  */
2256                 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
2257                         clusters_add += new_clusters;
2258                         credits += ocfs2_remove_extent_credits(inode->i_sb) +
2259                                     OCFS2_INODE_UPDATE_CREDITS;
2260                         if (!ocfs2_xattr_is_local(xe))
2261                                 credits += ocfs2_calc_extend_credits(
2262                                                         inode->i_sb,
2263                                                         &def_xv.xv.xr_list,
2264                                                         new_clusters);
2265                         goto out;
2266                 }
2267         }
2268
2269         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2270                 /* the new values will be stored outside. */
2271                 u32 old_clusters = 0;
2272
2273                 if (!ocfs2_xattr_is_local(xe)) {
2274                         old_clusters =  ocfs2_clusters_for_bytes(inode->i_sb,
2275                                                                  value_size);
2276                         xv = (struct ocfs2_xattr_value_root *)
2277                              (base + name_offset + name_len);
2278                         value_size = OCFS2_XATTR_ROOT_SIZE;
2279                 } else
2280                         xv = &def_xv.xv;
2281
2282                 if (old_clusters >= new_clusters) {
2283                         credits += ocfs2_remove_extent_credits(inode->i_sb);
2284                         goto out;
2285                 } else {
2286                         meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
2287                         clusters_add += new_clusters - old_clusters;
2288                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2289                                                              &xv->xr_list,
2290                                                              new_clusters -
2291                                                              old_clusters);
2292                         if (value_size >= OCFS2_XATTR_ROOT_SIZE)
2293                                 goto out;
2294                 }
2295         } else {
2296                 /*
2297                  * Now the new value will be stored inside. So if the new
2298                  * value is smaller than the size of value root or the old
2299                  * value, we don't need any allocation, otherwise we have
2300                  * to guess metadata allocation.
2301                  */
2302                 if ((ocfs2_xattr_is_local(xe) && value_size >= xi->value_len) ||
2303                     (!ocfs2_xattr_is_local(xe) &&
2304                      OCFS2_XATTR_ROOT_SIZE >= xi->value_len))
2305                         goto out;
2306         }
2307
2308 meta_guess:
2309         /* calculate metadata allocation. */
2310         if (di->i_xattr_loc) {
2311                 if (!xbs->xattr_bh) {
2312                         ret = ocfs2_read_xattr_block(inode,
2313                                                      le64_to_cpu(di->i_xattr_loc),
2314                                                      &bh);
2315                         if (ret) {
2316                                 mlog_errno(ret);
2317                                 goto out;
2318                         }
2319
2320                         xb = (struct ocfs2_xattr_block *)bh->b_data;
2321                 } else
2322                         xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2323
2324                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2325                         struct ocfs2_extent_list *el =
2326                                  &xb->xb_attrs.xb_root.xt_list;
2327                         meta_add += ocfs2_extend_meta_needed(el);
2328                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2329                                                              el, 1);
2330                 }
2331
2332                 /*
2333                  * This cluster will be used either for new bucket or for
2334                  * new xattr block.
2335                  * If the cluster size is the same as the bucket size, one
2336                  * more is needed since we may need to extend the bucket
2337                  * also.
2338                  */
2339                 clusters_add += 1;
2340                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2341                 if (OCFS2_XATTR_BUCKET_SIZE ==
2342                         OCFS2_SB(inode->i_sb)->s_clustersize) {
2343                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2344                         clusters_add += 1;
2345                 }
2346         } else {
2347                 meta_add += 1;
2348                 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
2349         }
2350 out:
2351         if (clusters_need)
2352                 *clusters_need = clusters_add;
2353         if (meta_need)
2354                 *meta_need = meta_add;
2355         if (credits_need)
2356                 *credits_need = credits;
2357         brelse(bh);
2358         return ret;
2359 }
2360
2361 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
2362                                      struct ocfs2_dinode *di,
2363                                      struct ocfs2_xattr_info *xi,
2364                                      struct ocfs2_xattr_search *xis,
2365                                      struct ocfs2_xattr_search *xbs,
2366                                      struct ocfs2_xattr_set_ctxt *ctxt,
2367                                      int *credits)
2368 {
2369         int clusters_add, meta_add, ret;
2370         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2371
2372         memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
2373
2374         ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
2375
2376         ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
2377                                         &clusters_add, &meta_add, credits);
2378         if (ret) {
2379                 mlog_errno(ret);
2380                 return ret;
2381         }
2382
2383         mlog(0, "Set xattr %s, reserve meta blocks = %d, clusters = %d, "
2384              "credits = %d\n", xi->name, meta_add, clusters_add, *credits);
2385
2386         if (meta_add) {
2387                 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
2388                                                         &ctxt->meta_ac);
2389                 if (ret) {
2390                         mlog_errno(ret);
2391                         goto out;
2392                 }
2393         }
2394
2395         if (clusters_add) {
2396                 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
2397                 if (ret)
2398                         mlog_errno(ret);
2399         }
2400 out:
2401         if (ret) {
2402                 if (ctxt->meta_ac) {
2403                         ocfs2_free_alloc_context(ctxt->meta_ac);
2404                         ctxt->meta_ac = NULL;
2405                 }
2406
2407                 /*
2408                  * We cannot have an error and a non null ctxt->data_ac.
2409                  */
2410         }
2411
2412         return ret;
2413 }
2414
2415 static int __ocfs2_xattr_set_handle(struct inode *inode,
2416                                     struct ocfs2_dinode *di,
2417                                     struct ocfs2_xattr_info *xi,
2418                                     struct ocfs2_xattr_search *xis,
2419                                     struct ocfs2_xattr_search *xbs,
2420                                     struct ocfs2_xattr_set_ctxt *ctxt)
2421 {
2422         int ret = 0, credits, old_found;
2423
2424         if (!xi->value) {
2425                 /* Remove existing extended attribute */
2426                 if (!xis->not_found)
2427                         ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2428                 else if (!xbs->not_found)
2429                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2430         } else {
2431                 /* We always try to set extended attribute into inode first*/
2432                 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2433                 if (!ret && !xbs->not_found) {
2434                         /*
2435                          * If succeed and that extended attribute existing in
2436                          * external block, then we will remove it.
2437                          */
2438                         xi->value = NULL;
2439                         xi->value_len = 0;
2440
2441                         old_found = xis->not_found;
2442                         xis->not_found = -ENODATA;
2443                         ret = ocfs2_calc_xattr_set_need(inode,
2444                                                         di,
2445                                                         xi,
2446                                                         xis,
2447                                                         xbs,
2448                                                         NULL,
2449                                                         NULL,
2450                                                         &credits);
2451                         xis->not_found = old_found;
2452                         if (ret) {
2453                                 mlog_errno(ret);
2454                                 goto out;
2455                         }
2456
2457                         ret = ocfs2_extend_trans(ctxt->handle, credits +
2458                                         ctxt->handle->h_buffer_credits);
2459                         if (ret) {
2460                                 mlog_errno(ret);
2461                                 goto out;
2462                         }
2463                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2464                 } else if (ret == -ENOSPC) {
2465                         if (di->i_xattr_loc && !xbs->xattr_bh) {
2466                                 ret = ocfs2_xattr_block_find(inode,
2467                                                              xi->name_index,
2468                                                              xi->name, xbs);
2469                                 if (ret)
2470                                         goto out;
2471
2472                                 old_found = xis->not_found;
2473                                 xis->not_found = -ENODATA;
2474                                 ret = ocfs2_calc_xattr_set_need(inode,
2475                                                                 di,
2476                                                                 xi,
2477                                                                 xis,
2478                                                                 xbs,
2479                                                                 NULL,
2480                                                                 NULL,
2481                                                                 &credits);
2482                                 xis->not_found = old_found;
2483                                 if (ret) {
2484                                         mlog_errno(ret);
2485                                         goto out;
2486                                 }
2487
2488                                 ret = ocfs2_extend_trans(ctxt->handle, credits +
2489                                         ctxt->handle->h_buffer_credits);
2490                                 if (ret) {
2491                                         mlog_errno(ret);
2492                                         goto out;
2493                                 }
2494                         }
2495                         /*
2496                          * If no space in inode, we will set extended attribute
2497                          * into external block.
2498                          */
2499                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2500                         if (ret)
2501                                 goto out;
2502                         if (!xis->not_found) {
2503                                 /*
2504                                  * If succeed and that extended attribute
2505                                  * existing in inode, we will remove it.
2506                                  */
2507                                 xi->value = NULL;
2508                                 xi->value_len = 0;
2509                                 xbs->not_found = -ENODATA;
2510                                 ret = ocfs2_calc_xattr_set_need(inode,
2511                                                                 di,
2512                                                                 xi,
2513                                                                 xis,
2514                                                                 xbs,
2515                                                                 NULL,
2516                                                                 NULL,
2517                                                                 &credits);
2518                                 if (ret) {
2519                                         mlog_errno(ret);
2520                                         goto out;
2521                                 }
2522
2523                                 ret = ocfs2_extend_trans(ctxt->handle, credits +
2524                                                 ctxt->handle->h_buffer_credits);
2525                                 if (ret) {
2526                                         mlog_errno(ret);
2527                                         goto out;
2528                                 }
2529                                 ret = ocfs2_xattr_ibody_set(inode, xi,
2530                                                             xis, ctxt);
2531                         }
2532                 }
2533         }
2534
2535 out:
2536         return ret;
2537 }
2538
2539 /*
2540  * This function only called duing creating inode
2541  * for init security/acl xattrs of the new inode.
2542  * The xattrs could be put into ibody or extent block,
2543  * xattr bucket would not be use in this case.
2544  * transanction credits also be reserved in here.
2545  */
2546 int ocfs2_xattr_set_handle(handle_t *handle,
2547                            struct inode *inode,
2548                            struct buffer_head *di_bh,
2549                            int name_index,
2550                            const char *name,
2551                            const void *value,
2552                            size_t value_len,
2553                            int flags,
2554                            struct ocfs2_alloc_context *meta_ac,
2555                            struct ocfs2_alloc_context *data_ac)
2556 {
2557         struct ocfs2_dinode *di;
2558         int ret;
2559
2560         struct ocfs2_xattr_info xi = {
2561                 .name_index = name_index,
2562                 .name = name,
2563                 .value = value,
2564                 .value_len = value_len,
2565         };
2566
2567         struct ocfs2_xattr_search xis = {
2568                 .not_found = -ENODATA,
2569         };
2570
2571         struct ocfs2_xattr_search xbs = {
2572                 .not_found = -ENODATA,
2573         };
2574
2575         struct ocfs2_xattr_set_ctxt ctxt = {
2576                 .handle = handle,
2577                 .meta_ac = meta_ac,
2578                 .data_ac = data_ac,
2579         };
2580
2581         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2582                 return -EOPNOTSUPP;
2583
2584         xis.inode_bh = xbs.inode_bh = di_bh;
2585         di = (struct ocfs2_dinode *)di_bh->b_data;
2586
2587         down_write(&OCFS2_I(inode)->ip_xattr_sem);
2588
2589         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2590         if (ret)
2591                 goto cleanup;
2592         if (xis.not_found) {
2593                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2594                 if (ret)
2595                         goto cleanup;
2596         }
2597
2598         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
2599
2600 cleanup:
2601         up_write(&OCFS2_I(inode)->ip_xattr_sem);
2602         brelse(xbs.xattr_bh);
2603
2604         return ret;
2605 }
2606
2607 /*
2608  * ocfs2_xattr_set()
2609  *
2610  * Set, replace or remove an extended attribute for this inode.
2611  * value is NULL to remove an existing extended attribute, else either
2612  * create or replace an extended attribute.
2613  */
2614 int ocfs2_xattr_set(struct inode *inode,
2615                     int name_index,
2616                     const char *name,
2617                     const void *value,
2618                     size_t value_len,
2619                     int flags)
2620 {
2621         struct buffer_head *di_bh = NULL;
2622         struct ocfs2_dinode *di;
2623         int ret, credits;
2624         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2625         struct inode *tl_inode = osb->osb_tl_inode;
2626         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2627
2628         struct ocfs2_xattr_info xi = {
2629                 .name_index = name_index,
2630                 .name = name,
2631                 .value = value,
2632                 .value_len = value_len,
2633         };
2634
2635         struct ocfs2_xattr_search xis = {
2636                 .not_found = -ENODATA,
2637         };
2638
2639         struct ocfs2_xattr_search xbs = {
2640                 .not_found = -ENODATA,
2641         };
2642
2643         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2644                 return -EOPNOTSUPP;
2645
2646         /*
2647          * Only xbs will be used on indexed trees.  xis doesn't need a
2648          * bucket.
2649          */
2650         xbs.bucket = ocfs2_xattr_bucket_new(inode);
2651         if (!xbs.bucket) {
2652                 mlog_errno(-ENOMEM);
2653                 return -ENOMEM;
2654         }
2655
2656         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2657         if (ret < 0) {
2658                 mlog_errno(ret);
2659                 goto cleanup_nolock;
2660         }
2661         xis.inode_bh = xbs.inode_bh = di_bh;
2662         di = (struct ocfs2_dinode *)di_bh->b_data;
2663
2664         down_write(&OCFS2_I(inode)->ip_xattr_sem);
2665         /*
2666          * Scan inode and external block to find the same name
2667          * extended attribute and collect search infomation.
2668          */
2669         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
2670         if (ret)
2671                 goto cleanup;
2672         if (xis.not_found) {
2673                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
2674                 if (ret)
2675                         goto cleanup;
2676         }
2677
2678         if (xis.not_found && xbs.not_found) {
2679                 ret = -ENODATA;
2680                 if (flags & XATTR_REPLACE)
2681                         goto cleanup;
2682                 ret = 0;
2683                 if (!value)
2684                         goto cleanup;
2685         } else {
2686                 ret = -EEXIST;
2687                 if (flags & XATTR_CREATE)
2688                         goto cleanup;
2689         }
2690
2691
2692         mutex_lock(&tl_inode->i_mutex);
2693
2694         if (ocfs2_truncate_log_needs_flush(osb)) {
2695                 ret = __ocfs2_flush_truncate_log(osb);
2696                 if (ret < 0) {
2697                         mutex_unlock(&tl_inode->i_mutex);
2698                         mlog_errno(ret);
2699                         goto cleanup;
2700                 }
2701         }
2702         mutex_unlock(&tl_inode->i_mutex);
2703
2704         ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
2705                                         &xbs, &ctxt, &credits);
2706         if (ret) {
2707                 mlog_errno(ret);
2708                 goto cleanup;
2709         }
2710
2711         ctxt.handle = ocfs2_start_trans(osb, credits);
2712         if (IS_ERR(ctxt.handle)) {
2713                 ret = PTR_ERR(ctxt.handle);
2714                 mlog_errno(ret);
2715                 goto cleanup;
2716         }
2717
2718         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
2719
2720         ocfs2_commit_trans(osb, ctxt.handle);
2721
2722         if (ctxt.data_ac)
2723                 ocfs2_free_alloc_context(ctxt.data_ac);
2724         if (ctxt.meta_ac)
2725                 ocfs2_free_alloc_context(ctxt.meta_ac);
2726         if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
2727                 ocfs2_schedule_truncate_log_flush(osb, 1);
2728         ocfs2_run_deallocs(osb, &ctxt.dealloc);
2729 cleanup:
2730         up_write(&OCFS2_I(inode)->ip_xattr_sem);
2731         ocfs2_inode_unlock(inode, 1);
2732 cleanup_nolock:
2733         brelse(di_bh);
2734         brelse(xbs.xattr_bh);
2735         ocfs2_xattr_bucket_free(xbs.bucket);
2736
2737         return ret;
2738 }
2739
2740 /*
2741  * Find the xattr extent rec which may contains name_hash.
2742  * e_cpos will be the first name hash of the xattr rec.
2743  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
2744  */
2745 static int ocfs2_xattr_get_rec(struct inode *inode,
2746                                u32 name_hash,
2747                                u64 *p_blkno,
2748                                u32 *e_cpos,
2749                                u32 *num_clusters,
2750                                struct ocfs2_extent_list *el)
2751 {
2752         int ret = 0, i;
2753         struct buffer_head *eb_bh = NULL;
2754         struct ocfs2_extent_block *eb;
2755         struct ocfs2_extent_rec *rec = NULL;
2756         u64 e_blkno = 0;
2757
2758         if (el->l_tree_depth) {
2759                 ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
2760                 if (ret) {
2761                         mlog_errno(ret);
2762                         goto out;
2763                 }
2764
2765                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2766                 el = &eb->h_list;
2767
2768                 if (el->l_tree_depth) {
2769                         ocfs2_error(inode->i_sb,
2770                                     "Inode %lu has non zero tree depth in "
2771                                     "xattr tree block %llu\n", inode->i_ino,
2772                                     (unsigned long long)eb_bh->b_blocknr);
2773                         ret = -EROFS;
2774                         goto out;
2775                 }
2776         }
2777
2778         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
2779                 rec = &el->l_recs[i];
2780
2781                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
2782                         e_blkno = le64_to_cpu(rec->e_blkno);
2783                         break;
2784                 }
2785         }
2786
2787         if (!e_blkno) {
2788                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
2789                             "record (%u, %u, 0) in xattr", inode->i_ino,
2790                             le32_to_cpu(rec->e_cpos),
2791                             ocfs2_rec_clusters(el, rec));
2792                 ret = -EROFS;
2793                 goto out;
2794         }
2795
2796         *p_blkno = le64_to_cpu(rec->e_blkno);
2797         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
2798         if (e_cpos)
2799                 *e_cpos = le32_to_cpu(rec->e_cpos);
2800 out:
2801         brelse(eb_bh);
2802         return ret;
2803 }
2804
2805 typedef int (xattr_bucket_func)(struct inode *inode,
2806                                 struct ocfs2_xattr_bucket *bucket,
2807                                 void *para);
2808
2809 static int ocfs2_find_xe_in_bucket(struct inode *inode,
2810                                    struct ocfs2_xattr_bucket *bucket,
2811                                    int name_index,
2812                                    const char *name,
2813                                    u32 name_hash,
2814                                    u16 *xe_index,
2815                                    int *found)
2816 {
2817         int i, ret = 0, cmp = 1, block_off, new_offset;
2818         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
2819         size_t name_len = strlen(name);
2820         struct ocfs2_xattr_entry *xe = NULL;
2821         char *xe_name;
2822
2823         /*
2824          * We don't use binary search in the bucket because there
2825          * may be multiple entries with the same name hash.
2826          */
2827         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
2828                 xe = &xh->xh_entries[i];
2829
2830                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
2831                         continue;
2832                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
2833                         break;
2834
2835                 cmp = name_index - ocfs2_xattr_get_type(xe);
2836                 if (!cmp)
2837                         cmp = name_len - xe->xe_name_len;
2838                 if (cmp)
2839                         continue;
2840
2841                 ret = ocfs2_xattr_bucket_get_name_value(inode,
2842                                                         xh,
2843                                                         i,
2844                                                         &block_off,
2845                                                         &new_offset);
2846                 if (ret) {
2847                         mlog_errno(ret);
2848                         break;
2849                 }
2850
2851
2852                 xe_name = bucket_block(bucket, block_off) + new_offset;
2853                 if (!memcmp(name, xe_name, name_len)) {
2854                         *xe_index = i;
2855                         *found = 1;
2856                         ret = 0;
2857                         break;
2858                 }
2859         }
2860
2861         return ret;
2862 }
2863
2864 /*
2865  * Find the specified xattr entry in a series of buckets.
2866  * This series start from p_blkno and last for num_clusters.
2867  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
2868  * the num of the valid buckets.
2869  *
2870  * Return the buffer_head this xattr should reside in. And if the xattr's
2871  * hash is in the gap of 2 buckets, return the lower bucket.
2872  */
2873 static int ocfs2_xattr_bucket_find(struct inode *inode,
2874                                    int name_index,
2875                                    const char *name,
2876                                    u32 name_hash,
2877                                    u64 p_blkno,
2878                                    u32 first_hash,
2879                                    u32 num_clusters,
2880                                    struct ocfs2_xattr_search *xs)
2881 {
2882         int ret, found = 0;
2883         struct ocfs2_xattr_header *xh = NULL;
2884         struct ocfs2_xattr_entry *xe = NULL;
2885         u16 index = 0;
2886         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2887         int low_bucket = 0, bucket, high_bucket;
2888         struct ocfs2_xattr_bucket *search;
2889         u32 last_hash;
2890         u64 blkno, lower_blkno = 0;
2891
2892         search = ocfs2_xattr_bucket_new(inode);
2893         if (!search) {
2894                 ret = -ENOMEM;
2895                 mlog_errno(ret);
2896                 goto out;
2897         }
2898
2899         ret = ocfs2_read_xattr_bucket(search, p_blkno);
2900         if (ret) {
2901                 mlog_errno(ret);
2902                 goto out;
2903         }
2904
2905         xh = bucket_xh(search);
2906         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
2907         while (low_bucket <= high_bucket) {
2908                 ocfs2_xattr_bucket_relse(search);
2909
2910                 bucket = (low_bucket + high_bucket) / 2;
2911                 blkno = p_blkno + bucket * blk_per_bucket;
2912                 ret = ocfs2_read_xattr_bucket(search, blkno);
2913                 if (ret) {
2914                         mlog_errno(ret);
2915                         goto out;
2916                 }
2917
2918                 xh = bucket_xh(search);
2919                 xe = &xh->xh_entries[0];
2920                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
2921                         high_bucket = bucket - 1;
2922                         continue;
2923                 }
2924
2925                 /*
2926                  * Check whether the hash of the last entry in our
2927                  * bucket is larger than the search one. for an empty
2928                  * bucket, the last one is also the first one.
2929                  */
2930                 if (xh->xh_count)
2931                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
2932
2933                 last_hash = le32_to_cpu(xe->xe_name_hash);
2934
2935                 /* record lower_blkno which may be the insert place. */
2936                 lower_blkno = blkno;
2937
2938                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
2939                         low_bucket = bucket + 1;
2940                         continue;
2941                 }
2942
2943                 /* the searched xattr should reside in this bucket if exists. */
2944                 ret = ocfs2_find_xe_in_bucket(inode, search,
2945                                               name_index, name, name_hash,
2946                                               &index, &found);
2947                 if (ret) {
2948                         mlog_errno(ret);
2949                         goto out;
2950                 }
2951                 break;
2952         }
2953
2954         /*
2955          * Record the bucket we have found.
2956          * When the xattr's hash value is in the gap of 2 buckets, we will
2957          * always set it to the previous bucket.
2958          */
2959         if (!lower_blkno)
2960                 lower_blkno = p_blkno;
2961
2962         /* This should be in cache - we just read it during the search */
2963         ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
2964         if (ret) {
2965                 mlog_errno(ret);
2966                 goto out;
2967         }
2968
2969         xs->header = bucket_xh(xs->bucket);
2970         xs->base = bucket_block(xs->bucket, 0);
2971         xs->end = xs->base + inode->i_sb->s_blocksize;
2972
2973         if (found) {
2974                 xs->here = &xs->header->xh_entries[index];
2975                 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
2976                      (unsigned long long)bucket_blkno(xs->bucket), index);
2977         } else
2978                 ret = -ENODATA;
2979
2980 out:
2981         ocfs2_xattr_bucket_free(search);
2982         return ret;
2983 }
2984
2985 static int ocfs2_xattr_index_block_find(struct inode *inode,
2986                                         struct buffer_head *root_bh,
2987                                         int name_index,
2988                                         const char *name,
2989                                         struct ocfs2_xattr_search *xs)
2990 {
2991         int ret;
2992         struct ocfs2_xattr_block *xb =
2993                         (struct ocfs2_xattr_block *)root_bh->b_data;
2994         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
2995         struct ocfs2_extent_list *el = &xb_root->xt_list;
2996         u64 p_blkno = 0;
2997         u32 first_hash, num_clusters = 0;
2998         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
2999
3000         if (le16_to_cpu(el->l_next_free_rec) == 0)
3001                 return -ENODATA;
3002
3003         mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
3004              name, name_hash, name_index);
3005
3006         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3007                                   &num_clusters, el);
3008         if (ret) {
3009                 mlog_errno(ret);
3010                 goto out;
3011         }
3012
3013         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3014
3015         mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
3016              "in the rec is %u\n", num_clusters, (unsigned long long)p_blkno,
3017              first_hash);
3018
3019         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3020                                       p_blkno, first_hash, num_clusters, xs);
3021
3022 out:
3023         return ret;
3024 }
3025
3026 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3027                                        u64 blkno,
3028                                        u32 clusters,
3029                                        xattr_bucket_func *func,
3030                                        void *para)
3031 {
3032         int i, ret = 0;
3033         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3034         u32 num_buckets = clusters * bpc;
3035         struct ocfs2_xattr_bucket *bucket;
3036
3037         bucket = ocfs2_xattr_bucket_new(inode);
3038         if (!bucket) {
3039                 mlog_errno(-ENOMEM);
3040                 return -ENOMEM;
3041         }
3042
3043         mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
3044              clusters, (unsigned long long)blkno);
3045
3046         for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3047                 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3048                 if (ret) {
3049                         mlog_errno(ret);
3050                         break;
3051                 }
3052
3053                 /*
3054                  * The real bucket num in this series of blocks is stored
3055                  * in the 1st bucket.
3056                  */
3057                 if (i == 0)
3058                         num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3059
3060                 mlog(0, "iterating xattr bucket %llu, first hash %u\n",
3061                      (unsigned long long)blkno,
3062                      le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3063                 if (func) {
3064                         ret = func(inode, bucket, para);
3065                         if (ret)
3066                                 mlog_errno(ret);
3067                         /* Fall through to bucket_relse() */
3068                 }
3069
3070                 ocfs2_xattr_bucket_relse(bucket);
3071                 if (ret)
3072                         break;
3073         }
3074
3075         ocfs2_xattr_bucket_free(bucket);
3076         return ret;
3077 }
3078
3079 struct ocfs2_xattr_tree_list {
3080         char *buffer;
3081         size_t buffer_size;
3082         size_t result;
3083 };
3084
3085 static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
3086                                              struct ocfs2_xattr_header *xh,
3087                                              int index,
3088                                              int *block_off,
3089                                              int *new_offset)
3090 {
3091         u16 name_offset;
3092
3093         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
3094                 return -EINVAL;
3095
3096         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
3097
3098         *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
3099         *new_offset = name_offset % inode->i_sb->s_blocksize;
3100
3101         return 0;
3102 }
3103
3104 static int ocfs2_list_xattr_bucket(struct inode *inode,
3105                                    struct ocfs2_xattr_bucket *bucket,
3106                                    void *para)
3107 {
3108         int ret = 0, type;
3109         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
3110         int i, block_off, new_offset;
3111         const char *prefix, *name;
3112
3113         for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
3114                 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
3115                 type = ocfs2_xattr_get_type(entry);
3116                 prefix = ocfs2_xattr_prefix(type);
3117
3118                 if (prefix) {
3119                         ret = ocfs2_xattr_bucket_get_name_value(inode,
3120                                                                 bucket_xh(bucket),
3121                                                                 i,
3122                                                                 &block_off,
3123                                                                 &new_offset);
3124                         if (ret)
3125                                 break;
3126
3127                         name = (const char *)bucket_block(bucket, block_off) +
3128                                 new_offset;
3129                         ret = ocfs2_xattr_list_entry(xl->buffer,
3130                                                      xl->buffer_size,
3131                                                      &xl->result,
3132                                                      prefix, name,
3133                                                      entry->xe_name_len);
3134                         if (ret)
3135                                 break;
3136                 }
3137         }
3138
3139         return ret;
3140 }
3141
3142 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
3143                                              struct ocfs2_xattr_tree_root *xt,
3144                                              char *buffer,
3145                                              size_t buffer_size)
3146 {
3147         struct ocfs2_extent_list *el = &xt->xt_list;
3148         int ret = 0;
3149         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
3150         u64 p_blkno = 0;
3151         struct ocfs2_xattr_tree_list xl = {
3152                 .buffer = buffer,
3153                 .buffer_size = buffer_size,
3154                 .result = 0,
3155         };
3156
3157         if (le16_to_cpu(el->l_next_free_rec) == 0)
3158                 return 0;
3159
3160         while (name_hash > 0) {
3161                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
3162                                           &e_cpos, &num_clusters, el);
3163                 if (ret) {
3164                         mlog_errno(ret);
3165                         goto out;
3166                 }
3167
3168                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
3169                                                   ocfs2_list_xattr_bucket,
3170                                                   &xl);
3171                 if (ret) {
3172                         mlog_errno(ret);
3173                         goto out;
3174                 }
3175
3176                 if (e_cpos == 0)
3177                         break;
3178
3179                 name_hash = e_cpos - 1;
3180         }
3181
3182         ret = xl.result;
3183 out:
3184         return ret;
3185 }
3186
3187 static int cmp_xe(const void *a, const void *b)
3188 {
3189         const struct ocfs2_xattr_entry *l = a, *r = b;
3190         u32 l_hash = le32_to_cpu(l->xe_name_hash);
3191         u32 r_hash = le32_to_cpu(r->xe_name_hash);
3192
3193         if (l_hash > r_hash)
3194                 return 1;
3195         if (l_hash < r_hash)
3196                 return -1;
3197         return 0;
3198 }
3199
3200 static void swap_xe(void *a, void *b, int size)
3201 {
3202         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
3203
3204         tmp = *l;
3205         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
3206         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
3207 }
3208
3209 /*
3210  * When the ocfs2_xattr_block is filled up, new bucket will be created
3211  * and all the xattr entries will be moved to the new bucket.
3212  * The header goes at the start of the bucket, and the names+values are
3213  * filled from the end.  This is why *target starts as the last buffer.
3214  * Note: we need to sort the entries since they are not saved in order
3215  * in the ocfs2_xattr_block.
3216  */
3217 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
3218                                            struct buffer_head *xb_bh,
3219                                            struct ocfs2_xattr_bucket *bucket)
3220 {
3221         int i, blocksize = inode->i_sb->s_blocksize;
3222         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3223         u16 offset, size, off_change;
3224         struct ocfs2_xattr_entry *xe;
3225         struct ocfs2_xattr_block *xb =
3226                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
3227         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
3228         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3229         u16 count = le16_to_cpu(xb_xh->xh_count);
3230         char *src = xb_bh->b_data;
3231         char *target = bucket_block(bucket, blks - 1);
3232
3233         mlog(0, "cp xattr from block %llu to bucket %llu\n",
3234              (unsigned long long)xb_bh->b_blocknr,
3235              (unsigned long long)bucket_blkno(bucket));
3236
3237         for (i = 0; i < blks; i++)
3238                 memset(bucket_block(bucket, i), 0, blocksize);
3239
3240         /*
3241          * Since the xe_name_offset is based on ocfs2_xattr_header,
3242          * there is a offset change corresponding to the change of
3243          * ocfs2_xattr_header's position.
3244          */
3245         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3246         xe = &xb_xh->xh_entries[count - 1];
3247         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
3248         size = blocksize - offset;
3249
3250         /* copy all the names and values. */
3251         memcpy(target + offset, src + offset, size);
3252
3253         /* Init new header now. */
3254         xh->xh_count = xb_xh->xh_count;
3255         xh->xh_num_buckets = cpu_to_le16(1);
3256         xh->xh_name_value_len = cpu_to_le16(size);
3257         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
3258
3259         /* copy all the entries. */
3260         target = bucket_block(bucket, 0);
3261         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
3262         size = count * sizeof(struct ocfs2_xattr_entry);
3263         memcpy(target + offset, (char *)xb_xh + offset, size);
3264
3265         /* Change the xe offset for all the xe because of the move. */
3266         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
3267                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3268         for (i = 0; i < count; i++)
3269                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
3270
3271         mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
3272              offset, size, off_change);
3273
3274         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
3275              cmp_xe, swap_xe);
3276 }
3277
3278 /*
3279  * After we move xattr from block to index btree, we have to
3280  * update ocfs2_xattr_search to the new xe and base.
3281  *
3282  * When the entry is in xattr block, xattr_bh indicates the storage place.
3283  * While if the entry is in index b-tree, "bucket" indicates the
3284  * real place of the xattr.
3285  */
3286 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
3287                                             struct ocfs2_xattr_search *xs,
3288                                             struct buffer_head *old_bh)
3289 {
3290         char *buf = old_bh->b_data;
3291         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
3292         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
3293         int i;
3294
3295         xs->header = bucket_xh(xs->bucket);
3296         xs->base = bucket_block(xs->bucket, 0);
3297         xs->end = xs->base + inode->i_sb->s_blocksize;
3298
3299         if (xs->not_found)
3300                 return;
3301
3302         i = xs->here - old_xh->xh_entries;
3303         xs->here = &xs->header->xh_entries[i];
3304 }
3305
3306 static int ocfs2_xattr_create_index_block(struct inode *inode,
3307                                           struct ocfs2_xattr_search *xs,
3308                                           struct ocfs2_xattr_set_ctxt *ctxt)
3309 {
3310         int ret;
3311         u32 bit_off, len;
3312         u64 blkno;
3313         handle_t *handle = ctxt->handle;
3314         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3315         struct ocfs2_inode_info *oi = OCFS2_I(inode);
3316         struct buffer_head *xb_bh = xs->xattr_bh;
3317         struct ocfs2_xattr_block *xb =
3318                         (struct ocfs2_xattr_block *)xb_bh->b_data;
3319         struct ocfs2_xattr_tree_root *xr;
3320         u16 xb_flags = le16_to_cpu(xb->xb_flags);
3321
3322         mlog(0, "create xattr index block for %llu\n",
3323              (unsigned long long)xb_bh->b_blocknr);
3324
3325         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
3326         BUG_ON(!xs->bucket);
3327
3328         /*
3329          * XXX:
3330          * We can use this lock for now, and maybe move to a dedicated mutex
3331          * if performance becomes a problem later.
3332          */
3333         down_write(&oi->ip_alloc_sem);
3334
3335         ret = ocfs2_journal_access(handle, inode, xb_bh,
3336                                    OCFS2_JOURNAL_ACCESS_WRITE);
3337         if (ret) {
3338                 mlog_errno(ret);
3339                 goto out;
3340         }
3341
3342         ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac,
3343                                      1, 1, &bit_off, &len);
3344         if (ret) {
3345                 mlog_errno(ret);
3346                 goto out;
3347         }
3348
3349         /*
3350          * The bucket may spread in many blocks, and
3351          * we will only touch the 1st block and the last block
3352          * in the whole bucket(one for entry and one for data).
3353          */
3354         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
3355
3356         mlog(0, "allocate 1 cluster from %llu to xattr block\n",
3357              (unsigned long long)blkno);
3358
3359         ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
3360         if (ret) {
3361                 mlog_errno(ret);
3362                 goto out;
3363         }
3364
3365         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
3366                                                 OCFS2_JOURNAL_ACCESS_CREATE);
3367         if (ret) {
3368                 mlog_errno(ret);
3369                 goto out;
3370         }
3371
3372         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
3373         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
3374
3375         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
3376
3377         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
3378         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
3379                offsetof(struct ocfs2_xattr_block, xb_attrs));
3380
3381         xr = &xb->xb_attrs.xb_root;
3382         xr->xt_clusters = cpu_to_le32(1);
3383         xr->xt_last_eb_blk = 0;
3384         xr->xt_list.l_tree_depth = 0;
3385         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
3386         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
3387
3388         xr->xt_list.l_recs[0].e_cpos = 0;
3389         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
3390         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
3391
3392         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
3393
3394         ocfs2_journal_dirty(handle, xb_bh);
3395
3396 out:
3397         up_write(&oi->ip_alloc_sem);
3398
3399         return ret;
3400 }
3401
3402 static int cmp_xe_offset(const void *a, const void *b)
3403 {
3404         const struct ocfs2_xattr_entry *l = a, *r = b;
3405         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
3406         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
3407
3408         if (l_name_offset < r_name_offset)
3409                 return 1;
3410         if (l_name_offset > r_name_offset)
3411                 return -1;
3412         return 0;
3413 }
3414
3415 /*
3416  * defrag a xattr bucket if we find that the bucket has some
3417  * holes beteen name/value pairs.
3418  * We will move all the name/value pairs to the end of the bucket
3419  * so that we can spare some space for insertion.
3420  */
3421 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
3422                                      handle_t *handle,
3423                                      struct ocfs2_xattr_bucket *bucket)
3424 {
3425         int ret, i;
3426         size_t end, offset, len, value_len;
3427         struct ocfs2_xattr_header *xh;
3428         char *entries, *buf, *bucket_buf = NULL;
3429         u64 blkno = bucket_blkno(bucket);
3430         u16 xh_free_start;
3431         size_t blocksize = inode->i_sb->s_blocksize;
3432         struct ocfs2_xattr_entry *xe;
3433
3434         /*
3435          * In order to make the operation more efficient and generic,
3436          * we copy all the blocks into a contiguous memory and do the
3437          * defragment there, so if anything is error, we will not touch
3438          * the real block.
3439          */
3440         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
3441         if (!bucket_buf) {
3442                 ret = -EIO;
3443                 goto out;
3444         }
3445
3446         buf = bucket_buf;
3447         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3448                 memcpy(buf, bucket_block(bucket, i), blocksize);
3449
3450         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
3451                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3452         if (ret < 0) {
3453                 mlog_errno(ret);
3454                 goto out;
3455         }
3456
3457         xh = (struct ocfs2_xattr_header *)bucket_buf;
3458         entries = (char *)xh->xh_entries;
3459         xh_free_start = le16_to_cpu(xh->xh_free_start);
3460
3461         mlog(0, "adjust xattr bucket in %llu, count = %u, "
3462              "xh_free_start = %u, xh_name_value_len = %u.\n",
3463              (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
3464              xh_free_start, le16_to_cpu(xh->xh_name_value_len));
3465
3466         /*
3467          * sort all the entries by their offset.
3468          * the largest will be the first, so that we can
3469          * move them to the end one by one.
3470          */
3471         sort(entries, le16_to_cpu(xh->xh_count),
3472              sizeof(struct ocfs2_xattr_entry),
3473              cmp_xe_offset, swap_xe);
3474
3475         /* Move all name/values to the end of the bucket. */
3476         xe = xh->xh_entries;
3477         end = OCFS2_XATTR_BUCKET_SIZE;
3478         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
3479                 offset = le16_to_cpu(xe->xe_name_offset);
3480                 if (ocfs2_xattr_is_local(xe))
3481                         value_len = OCFS2_XATTR_SIZE(
3482                                         le64_to_cpu(xe->xe_value_size));
3483                 else
3484                         value_len = OCFS2_XATTR_ROOT_SIZE;
3485                 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
3486
3487                 /*
3488                  * We must make sure that the name/value pair
3489                  * exist in the same block. So adjust end to
3490                  * the previous block end if needed.
3491                  */
3492                 if (((end - len) / blocksize !=
3493                         (end - 1) / blocksize))
3494                         end = end - end % blocksize;
3495
3496                 if (end > offset + len) {
3497                         memmove(bucket_buf + end - len,
3498                                 bucket_buf + offset, len);
3499                         xe->xe_name_offset = cpu_to_le16(end - len);
3500                 }
3501
3502                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
3503                                 "bucket %llu\n", (unsigned long long)blkno);
3504
3505                 end -= len;
3506         }
3507
3508         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
3509                         "bucket %llu\n", (unsigned long long)blkno);
3510
3511         if (xh_free_start == end)
3512                 goto out;
3513
3514         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
3515         xh->xh_free_start = cpu_to_le16(end);
3516
3517         /* sort the entries by their name_hash. */
3518         sort(entries, le16_to_cpu(xh->xh_count),
3519              sizeof(struct ocfs2_xattr_entry),
3520              cmp_xe, swap_xe);
3521
3522         buf = bucket_buf;
3523         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3524                 memcpy(bucket_block(bucket, i), buf, blocksize);
3525         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
3526
3527 out:
3528         kfree(bucket_buf);
3529         return ret;
3530 }
3531
3532 /*
3533  * prev_blkno points to the start of an existing extent.  new_blkno
3534  * points to a newly allocated extent.  Because we know each of our
3535  * clusters contains more than bucket, we can easily split one cluster
3536  * at a bucket boundary.  So we take the last cluster of the existing
3537  * extent and split it down the middle.  We move the last half of the
3538  * buckets in the last cluster of the existing extent over to the new
3539  * extent.
3540  *
3541  * first_bh is the buffer at prev_blkno so we can update the existing
3542  * extent's bucket count.  header_bh is the bucket were we were hoping
3543  * to insert our xattr.  If the bucket move places the target in the new
3544  * extent, we'll update first_bh and header_bh after modifying the old
3545  * extent.
3546  *
3547  * first_hash will be set as the 1st xe's name_hash in the new extent.
3548  */
3549 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
3550                                                handle_t *handle,
3551                                                struct buffer_head **first_bh,
3552                                                struct buffer_head **header_bh,
3553                                                u64 new_blkno,
3554                                                u64 prev_blkno,
3555                                                u32 num_clusters,
3556                                                u32 *first_hash)
3557 {
3558         int ret;
3559         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3560         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3561         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3562         int to_move = num_buckets / 2;
3563         u64 src_blkno;
3564         u64 last_cluster_blkno = prev_blkno +
3565                 ((num_clusters - 1) * ocfs2_clusters_to_blocks(inode->i_sb, 1));
3566         struct ocfs2_xattr_header *xh =
3567                         (struct ocfs2_xattr_header *)((*first_bh)->b_data);
3568         struct ocfs2_xattr_bucket *new_target, *new_first;
3569
3570         BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
3571         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
3572
3573         mlog(0, "move half of xattrs in cluster %llu to %llu\n",
3574              (unsigned long long)last_cluster_blkno, (unsigned long long)new_blkno);
3575
3576         /* The first bucket of the new extent */
3577         new_first = ocfs2_xattr_bucket_new(inode);
3578         /* The target bucket if it was moved to the new extent */
3579         new_target = ocfs2_xattr_bucket_new(inode);
3580         if (!new_target || !new_first) {
3581                 ret = -ENOMEM;
3582                 mlog_errno(ret);
3583                 goto out;
3584         }
3585
3586         ret = ocfs2_mv_xattr_buckets(inode, handle, prev_blkno,
3587                                      last_cluster_blkno, new_blkno,
3588                                      to_move, first_hash);
3589         if (ret) {
3590                 mlog_errno(ret);
3591                 goto out;
3592         }
3593
3594         /* This is the first bucket that got moved */
3595         src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
3596
3597         /*
3598          * If the target bucket was part of the moved buckets, we need to
3599          * update first_bh and header_bh.
3600          */
3601         if ((*header_bh)->b_blocknr >= src_blkno) {
3602                 /* Find the block for the new target bucket */
3603                 src_blkno = new_blkno +
3604                         ((*header_bh)->b_blocknr - src_blkno);
3605
3606                 /*
3607                  * These shouldn't fail - the buffers are in the
3608                  * journal from ocfs2_cp_xattr_bucket().
3609                  */
3610                 ret = ocfs2_read_xattr_bucket(new_first, new_blkno);
3611                 if (ret) {
3612                         mlog_errno(ret);
3613                         goto out;
3614                 }
3615                 ret = ocfs2_read_xattr_bucket(new_target, src_blkno);
3616                 if (ret) {
3617                         mlog_errno(ret);
3618                         goto out;
3619                 }
3620
3621                 brelse(*first_bh);
3622                 *first_bh = new_first->bu_bhs[0];
3623                 get_bh(*first_bh);
3624
3625                 brelse(*header_bh);
3626                 *header_bh = new_target->bu_bhs[0];
3627                 get_bh(*header_bh);
3628         }
3629
3630 out:
3631         ocfs2_xattr_bucket_free(new_first);
3632         ocfs2_xattr_bucket_free(new_target);
3633
3634         return ret;
3635 }
3636
3637 /*
3638  * Find the suitable pos when we divide a bucket into 2.
3639  * We have to make sure the xattrs with the same hash value exist
3640  * in the same bucket.
3641  *
3642  * If this ocfs2_xattr_header covers more than one hash value, find a
3643  * place where the hash value changes.  Try to find the most even split.
3644  * The most common case is that all entries have different hash values,
3645  * and the first check we make will find a place to split.
3646  */
3647 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
3648 {
3649         struct ocfs2_xattr_entry *entries = xh->xh_entries;
3650         int count = le16_to_cpu(xh->xh_count);
3651         int delta, middle = count / 2;
3652
3653         /*
3654          * We start at the middle.  Each step gets farther away in both
3655          * directions.  We therefore hit the change in hash value
3656          * nearest to the middle.  Note that this loop does not execute for
3657          * count < 2.
3658          */
3659         for (delta = 0; delta < middle; delta++) {
3660                 /* Let's check delta earlier than middle */
3661                 if (cmp_xe(&entries[middle - delta - 1],
3662                            &entries[middle - delta]))
3663                         return middle - delta;
3664
3665                 /* For even counts, don't walk off the end */
3666                 if ((middle + delta + 1) == count)
3667                         continue;
3668
3669                 /* Now try delta past middle */
3670                 if (cmp_xe(&entries[middle + delta],
3671                            &entries[middle + delta + 1]))
3672                         return middle + delta + 1;
3673         }
3674
3675         /* Every entry had the same hash */
3676         return count;
3677 }
3678
3679 /*
3680  * Move some xattrs in old bucket(blk) to new bucket(new_blk).
3681  * first_hash will record the 1st hash of the new bucket.
3682  *
3683  * Normally half of the xattrs will be moved.  But we have to make
3684  * sure that the xattrs with the same hash value are stored in the
3685  * same bucket. If all the xattrs in this bucket have the same hash
3686  * value, the new bucket will be initialized as an empty one and the
3687  * first_hash will be initialized as (hash_value+1).
3688  */
3689 static int ocfs2_divide_xattr_bucket(struct inode *inode,
3690                                     handle_t *handle,
3691                                     u64 blk,
3692                                     u64 new_blk,
3693                                     u32 *first_hash,
3694                                     int new_bucket_head)
3695 {
3696         int ret, i;
3697         int count, start, len, name_value_len = 0, xe_len, name_offset = 0;
3698         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
3699         struct ocfs2_xattr_header *xh;
3700         struct ocfs2_xattr_entry *xe;
3701         int blocksize = inode->i_sb->s_blocksize;
3702
3703         mlog(0, "move some of xattrs from bucket %llu to %llu\n",
3704              (unsigned long long)blk, (unsigned long long)new_blk);
3705
3706         s_bucket = ocfs2_xattr_bucket_new(inode);
3707         t_bucket = ocfs2_xattr_bucket_new(inode);
3708         if (!s_bucket || !t_bucket) {
3709                 ret = -ENOMEM;
3710                 mlog_errno(ret);
3711                 goto out;
3712         }
3713
3714         ret = ocfs2_read_xattr_bucket(s_bucket, blk);
3715         if (ret) {
3716                 mlog_errno(ret);
3717                 goto out;
3718         }
3719
3720         ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
3721                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3722         if (ret) {
3723                 mlog_errno(ret);
3724                 goto out;
3725         }
3726
3727         /*
3728          * Even if !new_bucket_head, we're overwriting t_bucket.  Thus,
3729          * there's no need to read it.
3730          */
3731         ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
3732         if (ret) {
3733                 mlog_errno(ret);
3734                 goto out;
3735         }
3736
3737         /*
3738          * Hey, if we're overwriting t_bucket, what difference does
3739          * ACCESS_CREATE vs ACCESS_WRITE make?  See the comment in the
3740          * same part of ocfs2_cp_xattr_bucket().
3741          */
3742         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
3743                                                 new_bucket_head ?
3744                                                 OCFS2_JOURNAL_ACCESS_CREATE :
3745                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3746         if (ret) {
3747                 mlog_errno(ret);
3748                 goto out;
3749         }
3750
3751         xh = bucket_xh(s_bucket);
3752         count = le16_to_cpu(xh->xh_count);
3753         start = ocfs2_xattr_find_divide_pos(xh);
3754
3755         if (start == count) {
3756                 xe = &xh->xh_entries[start-1];
3757
3758                 /*
3759                  * initialized a new empty bucket here.
3760                  * The hash value is set as one larger than
3761                  * that of the last entry in the previous bucket.
3762                  */
3763                 for (i = 0; i < t_bucket->bu_blocks; i++)
3764                         memset(bucket_block(t_bucket, i), 0, blocksize);
3765
3766                 xh = bucket_xh(t_bucket);
3767                 xh->xh_free_start = cpu_to_le16(blocksize);
3768                 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
3769                 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
3770
3771                 goto set_num_buckets;
3772         }
3773
3774         /* copy the whole bucket to the new first. */
3775         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
3776
3777         /* update the new bucket. */
3778         xh = bucket_xh(t_bucket);
3779
3780         /*
3781          * Calculate the total name/value len and xh_free_start for
3782          * the old bucket first.
3783          */
3784         name_offset = OCFS2_XATTR_BUCKET_SIZE;
3785         name_value_len = 0;
3786         for (i = 0; i < start; i++) {
3787                 xe = &xh->xh_entries[i];
3788                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3789                 if (ocfs2_xattr_is_local(xe))
3790                         xe_len +=
3791                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3792                 else
3793                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3794                 name_value_len += xe_len;
3795                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
3796                         name_offset = le16_to_cpu(xe->xe_name_offset);
3797         }
3798
3799         /*
3800          * Now begin the modification to the new bucket.
3801          *
3802          * In the new bucket, We just move the xattr entry to the beginning
3803          * and don't touch the name/value. So there will be some holes in the
3804          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
3805          * called.
3806          */
3807         xe = &xh->xh_entries[start];
3808         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
3809         mlog(0, "mv xattr entry len %d from %d to %d\n", len,
3810              (int)((char *)xe - (char *)xh),
3811              (int)((char *)xh->xh_entries - (char *)xh));
3812         memmove((char *)xh->xh_entries, (char *)xe, len);
3813         xe = &xh->xh_entries[count - start];
3814         len = sizeof(struct ocfs2_xattr_entry) * start;
3815         memset((char *)xe, 0, len);
3816
3817         le16_add_cpu(&xh->xh_count, -start);
3818         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
3819
3820         /* Calculate xh_free_start for the new bucket. */
3821         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
3822         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3823                 xe = &xh->xh_entries[i];
3824                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3825                 if (ocfs2_xattr_is_local(xe))
3826                         xe_len +=
3827                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
3828                 else
3829                         xe_len += OCFS2_XATTR_ROOT_SIZE;
3830                 if (le16_to_cpu(xe->xe_name_offset) <
3831                     le16_to_cpu(xh->xh_free_start))
3832                         xh->xh_free_start = xe->xe_name_offset;
3833         }
3834
3835 set_num_buckets:
3836         /* set xh->xh_num_buckets for the new xh. */
3837         if (new_bucket_head)
3838                 xh->xh_num_buckets = cpu_to_le16(1);
3839         else
3840                 xh->xh_num_buckets = 0;
3841
3842         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
3843
3844         /* store the first_hash of the new bucket. */
3845         if (first_hash)
3846                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
3847
3848         /*
3849          * Now only update the 1st block of the old bucket.  If we
3850          * just added a new empty bucket, there is no need to modify
3851          * it.
3852          */
3853         if (start == count)
3854                 goto out;
3855
3856         xh = bucket_xh(s_bucket);
3857         memset(&xh->xh_entries[start], 0,
3858                sizeof(struct ocfs2_xattr_entry) * (count - start));
3859         xh->xh_count = cpu_to_le16(start);
3860         xh->xh_free_start = cpu_to_le16(name_offset);
3861         xh->xh_name_value_len = cpu_to_le16(name_value_len);
3862
3863         ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
3864
3865 out:
3866         ocfs2_xattr_bucket_free(s_bucket);
3867         ocfs2_xattr_bucket_free(t_bucket);
3868
3869         return ret;
3870 }
3871
3872 /*
3873  * Copy xattr from one bucket to another bucket.
3874  *
3875  * The caller must make sure that the journal transaction
3876  * has enough space for journaling.
3877  */
3878 static int ocfs2_cp_xattr_bucket(struct inode *inode,
3879                                  handle_t *handle,
3880                                  u64 s_blkno,
3881                                  u64 t_blkno,
3882                                  int t_is_new)
3883 {
3884         int ret;
3885         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
3886
3887         BUG_ON(s_blkno == t_blkno);
3888
3889         mlog(0, "cp bucket %llu to %llu, target is %d\n",
3890              (unsigned long long)s_blkno, (unsigned long long)t_blkno,
3891              t_is_new);
3892
3893         s_bucket = ocfs2_xattr_bucket_new(inode);
3894         t_bucket = ocfs2_xattr_bucket_new(inode);
3895         if (!s_bucket || !t_bucket) {
3896                 ret = -ENOMEM;
3897                 mlog_errno(ret);
3898                 goto out;
3899         }
3900
3901         ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
3902         if (ret)
3903                 goto out;
3904
3905         /*
3906          * Even if !t_is_new, we're overwriting t_bucket.  Thus,
3907          * there's no need to read it.
3908          */
3909         ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
3910         if (ret)
3911                 goto out;
3912
3913         /*
3914          * Hey, if we're overwriting t_bucket, what difference does
3915          * ACCESS_CREATE vs ACCESS_WRITE make?  Well, if we allocated a new
3916          * cluster to fill, we came here from
3917          * ocfs2_mv_xattr_buckets(), and it is really new -
3918          * ACCESS_CREATE is required.  But we also might have moved data
3919          * out of t_bucket before extending back into it.
3920          * ocfs2_add_new_xattr_bucket() can do this - its call to
3921          * ocfs2_add_new_xattr_cluster() may have created a new extent
3922          * and copied out the end of the old extent.  Then it re-extends
3923          * the old extent back to create space for new xattrs.  That's
3924          * how we get here, and the bucket isn't really new.
3925          */
3926         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
3927                                                 t_is_new ?
3928                                                 OCFS2_JOURNAL_ACCESS_CREATE :
3929                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3930         if (ret)
3931                 goto out;
3932
3933         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
3934         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
3935
3936 out:
3937         ocfs2_xattr_bucket_free(t_bucket);
3938         ocfs2_xattr_bucket_free(s_bucket);
3939
3940         return ret;
3941 }
3942
3943 /*
3944  * src_blk points to the start of an existing extent.  last_blk points to
3945  * last cluster in that extent.  to_blk points to a newly allocated
3946  * extent.  We copy the buckets from the cluster at last_blk to the new
3947  * extent.  If start_bucket is non-zero, we skip that many buckets before
3948  * we start copying.  The new extent's xh_num_buckets gets set to the
3949  * number of buckets we copied.  The old extent's xh_num_buckets shrinks
3950  * by the same amount.
3951  */
3952 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
3953                                   u64 src_blk, u64 last_blk, u64 to_blk,
3954                                   unsigned int start_bucket,
3955                                   u32 *first_hash)
3956 {
3957         int i, ret, credits;
3958         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3959         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3960         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
3961         struct ocfs2_xattr_bucket *old_first, *new_first;
3962
3963         mlog(0, "mv xattrs from cluster %llu to %llu\n",
3964              (unsigned long long)last_blk, (unsigned long long)to_blk);
3965
3966         BUG_ON(start_bucket >= num_buckets);
3967         if (start_bucket) {
3968                 num_buckets -= start_bucket;
3969                 last_blk += (start_bucket * blks_per_bucket);
3970         }
3971
3972         /* The first bucket of the original extent */
3973         old_first = ocfs2_xattr_bucket_new(inode);
3974         /* The first bucket of the new extent */
3975         new_first = ocfs2_xattr_bucket_new(inode);
3976         if (!old_first || !new_first) {
3977                 ret = -ENOMEM;
3978                 mlog_errno(ret);
3979                 goto out;
3980         }
3981
3982         ret = ocfs2_read_xattr_bucket(old_first, src_blk);
3983         if (ret) {
3984                 mlog_errno(ret);
3985                 goto out;
3986         }
3987
3988         /*
3989          * We need to update the first bucket of the old extent and all
3990          * the buckets going to the new extent.
3991          */
3992         credits = ((num_buckets + 1) * blks_per_bucket) +
3993                 handle->h_buffer_credits;
3994         ret = ocfs2_extend_trans(handle, credits);
3995         if (ret) {
3996                 mlog_errno(ret);
3997                 goto out;
3998         }
3999
4000         ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4001                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4002         if (ret) {
4003                 mlog_errno(ret);
4004                 goto out;
4005         }
4006
4007         for (i = 0; i < num_buckets; i++) {
4008                 ret = ocfs2_cp_xattr_bucket(inode, handle,
4009                                             last_blk + (i * blks_per_bucket),
4010                                             to_blk + (i * blks_per_bucket),
4011                                             1);
4012                 if (ret) {
4013                         mlog_errno(ret);
4014                         goto out;
4015                 }
4016         }
4017
4018         /*
4019          * Get the new bucket ready before we dirty anything
4020          * (This actually shouldn't fail, because we already dirtied
4021          * it once in ocfs2_cp_xattr_bucket()).
4022          */
4023         ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4024         if (ret) {
4025                 mlog_errno(ret);
4026                 goto out;
4027         }
4028         ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4029                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4030         if (ret) {
4031                 mlog_errno(ret);
4032                 goto out;
4033         }
4034
4035         /* Now update the headers */
4036         le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4037         ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4038
4039         bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4040         ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4041
4042         if (first_hash)
4043                 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4044
4045 out:
4046         ocfs2_xattr_bucket_free(new_first);
4047         ocfs2_xattr_bucket_free(old_first);
4048         return ret;
4049 }
4050
4051 /*
4052  * Move some xattrs in this cluster to the new cluster.
4053  * This function should only be called when bucket size == cluster size.
4054  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4055  */
4056 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4057                                       handle_t *handle,
4058                                       u64 prev_blk,
4059                                       u64 new_blk,
4060                                       u32 *first_hash)
4061 {
4062         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4063         int ret, credits = 2 * blk_per_bucket + handle->h_buffer_credits;
4064
4065         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4066
4067         ret = ocfs2_extend_trans(handle, credits);
4068         if (ret) {
4069                 mlog_errno(ret);
4070                 return ret;
4071         }
4072
4073         /* Move half of the xattr in start_blk to the next bucket. */
4074         return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4075                                           new_blk, first_hash, 1);
4076 }
4077
4078 /*
4079  * Move some xattrs from the old cluster to the new one since they are not
4080  * contiguous in ocfs2 xattr tree.
4081  *
4082  * new_blk starts a new separate cluster, and we will move some xattrs from
4083  * prev_blk to it. v_start will be set as the first name hash value in this
4084  * new cluster so that it can be used as e_cpos during tree insertion and
4085  * don't collide with our original b-tree operations. first_bh and header_bh
4086  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4087  * to extend the insert bucket.
4088  *
4089  * The problem is how much xattr should we move to the new one and when should
4090  * we update first_bh and header_bh?
4091  * 1. If cluster size > bucket size, that means the previous cluster has more
4092  *    than 1 bucket, so just move half nums of bucket into the new cluster and
4093  *    update the first_bh and header_bh if the insert bucket has been moved
4094  *    to the new cluster.
4095  * 2. If cluster_size == bucket_size:
4096  *    a) If the previous extent rec has more than one cluster and the insert
4097  *       place isn't in the last cluster, copy the entire last cluster to the
4098  *       new one. This time, we don't need to upate the first_bh and header_bh
4099  *       since they will not be moved into the new cluster.
4100  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
4101  *       the new one. And we set the extend flag to zero if the insert place is
4102  *       moved into the new allocated cluster since no extend is needed.
4103  */
4104 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
4105                                             handle_t *handle,
4106                                             struct buffer_head **first_bh,
4107                                             struct buffer_head **header_bh,
4108                                             u64 new_blk,
4109                                             u64 prev_blk,
4110                                             u32 prev_clusters,
4111                                             u32 *v_start,
4112                                             int *extend)
4113 {
4114         int ret;
4115         struct ocfs2_xattr_bucket *first, *target;
4116
4117         mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
4118              (unsigned long long)prev_blk, prev_clusters,
4119              (unsigned long long)new_blk);
4120
4121         /* The first bucket of the original extent */
4122         first = ocfs2_xattr_bucket_new(inode);
4123         /* The target bucket for insert */
4124         target = ocfs2_xattr_bucket_new(inode);
4125         if (!first || !target) {
4126                 ret = -ENOMEM;
4127                 mlog_errno(ret);
4128                 goto out;
4129         }
4130
4131         BUG_ON(prev_blk != (*first_bh)->b_blocknr);
4132         ret = ocfs2_read_xattr_bucket(first, prev_blk);
4133         if (ret) {
4134                 mlog_errno(ret);
4135                 goto out;
4136         }
4137
4138         ret = ocfs2_read_xattr_bucket(target, (*header_bh)->b_blocknr);
4139         if (ret) {
4140                 mlog_errno(ret);
4141                 goto out;
4142         }
4143
4144         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
4145                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
4146                                                           handle,
4147                                                           first_bh,
4148                                                           header_bh,
4149                                                           new_blk,
4150                                                           bucket_blkno(first),
4151                                                           prev_clusters,
4152                                                           v_start);
4153         else {
4154                 /* The start of the last cluster in the first extent */
4155                 u64 last_blk = bucket_blkno(first) +
4156                         ((prev_clusters - 1) *
4157                          ocfs2_clusters_to_blocks(inode->i_sb, 1));
4158
4159                 if (prev_clusters > 1 && bucket_blkno(target) != last_blk)
4160                         ret = ocfs2_mv_xattr_buckets(inode, handle,
4161                                                      bucket_blkno(first),
4162                                                      last_blk, new_blk, 0,
4163                                                      v_start);
4164                 else {
4165                         ret = ocfs2_divide_xattr_cluster(inode, handle,
4166                                                          last_blk, new_blk,
4167                                                          v_start);
4168
4169                         if ((bucket_blkno(target) == last_blk) && extend)
4170                                 *extend = 0;
4171                 }
4172         }
4173
4174 out:
4175         ocfs2_xattr_bucket_free(first);
4176         ocfs2_xattr_bucket_free(target);
4177
4178         return ret;
4179 }
4180
4181 /*
4182  * Add a new cluster for xattr storage.
4183  *
4184  * If the new cluster is contiguous with the previous one, it will be
4185  * appended to the same extent record, and num_clusters will be updated.
4186  * If not, we will insert a new extent for it and move some xattrs in
4187  * the last cluster into the new allocated one.
4188  * We also need to limit the maximum size of a btree leaf, otherwise we'll
4189  * lose the benefits of hashing because we'll have to search large leaves.
4190  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
4191  * if it's bigger).
4192  *
4193  * first_bh is the first block of the previous extent rec and header_bh
4194  * indicates the bucket we will insert the new xattrs. They will be updated
4195  * when the header_bh is moved into the new cluster.
4196  */
4197 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
4198                                        struct buffer_head *root_bh,
4199                                        struct buffer_head **first_bh,
4200                                        struct buffer_head **header_bh,
4201                                        u32 *num_clusters,
4202                                        u32 prev_cpos,
4203                                        u64 prev_blkno,
4204                                        int *extend,
4205                                        struct ocfs2_xattr_set_ctxt *ctxt)
4206 {
4207         int ret;
4208         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
4209         u32 prev_clusters = *num_clusters;
4210         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
4211         u64 block;
4212         handle_t *handle = ctxt->handle;
4213         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4214         struct ocfs2_extent_tree et;
4215
4216         mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
4217              "previous xattr blkno = %llu\n",
4218              (unsigned long long)OCFS2_I(inode)->ip_blkno,
4219              prev_cpos, (unsigned long long)prev_blkno);
4220
4221         ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
4222
4223         ret = ocfs2_journal_access(handle, inode, root_bh,
4224                                    OCFS2_JOURNAL_ACCESS_WRITE);
4225         if (ret < 0) {
4226                 mlog_errno(ret);
4227                 goto leave;
4228         }
4229
4230         ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac, 1,
4231                                      clusters_to_add, &bit_off, &num_bits);
4232         if (ret < 0) {
4233                 if (ret != -ENOSPC)
4234                         mlog_errno(ret);
4235                 goto leave;
4236         }
4237
4238         BUG_ON(num_bits > clusters_to_add);
4239
4240         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
4241         mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
4242              num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
4243
4244         if (prev_blkno + prev_clusters * bpc == block &&
4245             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
4246              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
4247                 /*
4248                  * If this cluster is contiguous with the old one and
4249                  * adding this new cluster, we don't surpass the limit of
4250                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
4251                  * initialized and used like other buckets in the previous
4252                  * cluster.
4253                  * So add it as a contiguous one. The caller will handle
4254                  * its init process.
4255                  */
4256                 v_start = prev_cpos + prev_clusters;
4257                 *num_clusters = prev_clusters + num_bits;
4258                 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
4259                      num_bits);
4260         } else {
4261                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
4262                                                        handle,
4263                                                        first_bh,
4264                                                        header_bh,
4265                                                        block,
4266                                                        prev_blkno,
4267                                                        prev_clusters,
4268                                                        &v_start,
4269                                                        extend);
4270                 if (ret) {
4271                         mlog_errno(ret);
4272                         goto leave;
4273                 }
4274         }
4275
4276         mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
4277              num_bits, (unsigned long long)block, v_start);
4278         ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
4279                                   num_bits, 0, ctxt->meta_ac);
4280         if (ret < 0) {
4281                 mlog_errno(ret);
4282                 goto leave;
4283         }
4284
4285         ret = ocfs2_journal_dirty(handle, root_bh);
4286         if (ret < 0)
4287                 mlog_errno(ret);
4288
4289 leave:
4290         return ret;
4291 }
4292
4293 /*
4294  * We are given an extent.  'first' is the bucket at the very front of
4295  * the extent.  The extent has space for an additional bucket past
4296  * bucket_xh(first)->xh_num_buckets.  'target_blkno' is the block number
4297  * of the target bucket.  We wish to shift every bucket past the target
4298  * down one, filling in that additional space.  When we get back to the
4299  * target, we split the target between itself and the now-empty bucket
4300  * at target+1 (aka, target_blkno + blks_per_bucket).
4301  */
4302 static int ocfs2_extend_xattr_bucket(struct inode *inode,
4303                                      handle_t *handle,
4304                                      struct ocfs2_xattr_bucket *first,
4305                                      u64 target_blk,
4306                                      u32 num_clusters)
4307 {
4308         int ret, credits;
4309         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4310         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4311         u64 end_blk;
4312         u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
4313
4314         mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
4315              "from %llu, len = %u\n", (unsigned long long)target_blk,
4316              (unsigned long long)bucket_blkno(first), num_clusters);
4317
4318         /* The extent must have room for an additional bucket */
4319         BUG_ON(new_bucket >=
4320                (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
4321
4322         /* end_blk points to the last existing bucket */
4323         end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
4324
4325         /*
4326          * end_blk is the start of the last existing bucket.
4327          * Thus, (end_blk - target_blk) covers the target bucket and
4328          * every bucket after it up to, but not including, the last
4329          * existing bucket.  Then we add the last existing bucket, the
4330          * new bucket, and the first bucket (3 * blk_per_bucket).
4331          */
4332         credits = (end_blk - target_blk) + (3 * blk_per_bucket) +
4333                   handle->h_buffer_credits;
4334         ret = ocfs2_extend_trans(handle, credits);
4335         if (ret) {
4336                 mlog_errno(ret);
4337                 goto out;
4338         }
4339
4340         ret = ocfs2_xattr_bucket_journal_access(handle, first,
4341                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4342         if (ret) {
4343                 mlog_errno(ret);
4344                 goto out;
4345         }
4346
4347         while (end_blk != target_blk) {
4348                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
4349                                             end_blk + blk_per_bucket, 0);
4350                 if (ret)
4351                         goto out;
4352                 end_blk -= blk_per_bucket;
4353         }
4354
4355         /* Move half of the xattr in target_blkno to the next bucket. */
4356         ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
4357                                         target_blk + blk_per_bucket, NULL, 0);
4358
4359         le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
4360         ocfs2_xattr_bucket_journal_dirty(handle, first);
4361
4362 out:
4363         return ret;
4364 }
4365
4366 /*
4367  * Add new xattr bucket in an extent record and adjust the buckets accordingly.
4368  * xb_bh is the ocfs2_xattr_block.
4369  * We will move all the buckets starting from header_bh to the next place. As
4370  * for this one, half num of its xattrs will be moved to the next one.
4371  *
4372  * We will allocate a new cluster if current cluster is full and adjust
4373  * header_bh and first_bh if the insert place is moved to the new cluster.
4374  */
4375 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
4376                                       struct buffer_head *xb_bh,
4377                                       struct buffer_head *header_bh,
4378                                       struct ocfs2_xattr_set_ctxt *ctxt)
4379 {
4380         struct ocfs2_xattr_header *first_xh = NULL;
4381         struct buffer_head *first_bh = NULL;
4382         struct ocfs2_xattr_block *xb =
4383                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4384         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
4385         struct ocfs2_extent_list *el = &xb_root->xt_list;
4386         struct ocfs2_xattr_header *xh =
4387                         (struct ocfs2_xattr_header *)header_bh->b_data;
4388         u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4389         struct super_block *sb = inode->i_sb;
4390         struct ocfs2_super *osb = OCFS2_SB(sb);
4391         int ret, num_buckets, extend = 1;
4392         u64 p_blkno;
4393         u32 e_cpos, num_clusters;
4394         /* The bucket at the front of the extent */
4395         struct ocfs2_xattr_bucket *first;
4396
4397         mlog(0, "Add new xattr bucket starting form %llu\n",
4398              (unsigned long long)header_bh->b_blocknr);
4399
4400         first = ocfs2_xattr_bucket_new(inode);
4401         if (!first) {
4402                 ret = -ENOMEM;
4403                 mlog_errno(ret);
4404                 goto out;
4405         }
4406
4407         /*
4408          * Add refrence for header_bh here because it may be
4409          * changed in ocfs2_add_new_xattr_cluster and we need
4410          * to free it in the end.
4411          */
4412         get_bh(header_bh);
4413
4414         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
4415                                   &num_clusters, el);
4416         if (ret) {
4417                 mlog_errno(ret);
4418                 goto out;
4419         }
4420
4421         ret = ocfs2_read_block(inode, p_blkno, &first_bh, NULL);
4422         if (ret) {
4423                 mlog_errno(ret);
4424                 goto out;
4425         }
4426
4427         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
4428         first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
4429
4430         if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
4431                 ret = ocfs2_add_new_xattr_cluster(inode,
4432                                                   xb_bh,
4433                                                   &first_bh,
4434                                                   &header_bh,
4435                                                   &num_clusters,
4436                                                   e_cpos,
4437                                                   p_blkno,
4438                                                   &extend,
4439                                                   ctxt);
4440                 if (ret) {
4441                         mlog_errno(ret);
4442                         goto out;
4443                 }
4444         }
4445
4446         if (extend) {
4447                 /* These bucket reads should be cached */
4448                 ret = ocfs2_read_xattr_bucket(first, first_bh->b_blocknr);
4449                 if (ret) {
4450                         mlog_errno(ret);
4451                         goto out;
4452                 }
4453                 ret = ocfs2_extend_xattr_bucket(inode,
4454                                                 ctxt->handle,
4455                                                 first, header_bh->b_blocknr,
4456                                                 num_clusters);
4457                 if (ret)
4458                         mlog_errno(ret);
4459         }
4460
4461 out:
4462         brelse(first_bh);
4463         brelse(header_bh);
4464         ocfs2_xattr_bucket_free(first);
4465         return ret;
4466 }
4467
4468 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
4469                                         struct ocfs2_xattr_bucket *bucket,
4470                                         int offs)
4471 {
4472         int block_off = offs >> inode->i_sb->s_blocksize_bits;
4473
4474         offs = offs % inode->i_sb->s_blocksize;
4475         return bucket_block(bucket, block_off) + offs;
4476 }
4477
4478 /*
4479  * Handle the normal xattr set, including replace, delete and new.
4480  *
4481  * Note: "local" indicates the real data's locality. So we can't
4482  * just its bucket locality by its length.
4483  */
4484 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
4485                                          struct ocfs2_xattr_info *xi,
4486                                          struct ocfs2_xattr_search *xs,
4487                                          u32 name_hash,
4488                                          int local)
4489 {
4490         struct ocfs2_xattr_entry *last, *xe;
4491         int name_len = strlen(xi->name);
4492         struct ocfs2_xattr_header *xh = xs->header;
4493         u16 count = le16_to_cpu(xh->xh_count), start;
4494         size_t blocksize = inode->i_sb->s_blocksize;
4495         char *val;
4496         size_t offs, size, new_size;
4497
4498         last = &xh->xh_entries[count];
4499         if (!xs->not_found) {
4500                 xe = xs->here;
4501                 offs = le16_to_cpu(xe->xe_name_offset);
4502                 if (ocfs2_xattr_is_local(xe))
4503                         size = OCFS2_XATTR_SIZE(name_len) +
4504                         OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4505                 else
4506                         size = OCFS2_XATTR_SIZE(name_len) +
4507                         OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4508
4509                 /*
4510                  * If the new value will be stored outside, xi->value has been
4511                  * initalized as an empty ocfs2_xattr_value_root, and the same
4512                  * goes with xi->value_len, so we can set new_size safely here.
4513                  * See ocfs2_xattr_set_in_bucket.
4514                  */
4515                 new_size = OCFS2_XATTR_SIZE(name_len) +
4516                            OCFS2_XATTR_SIZE(xi->value_len);
4517
4518                 le16_add_cpu(&xh->xh_name_value_len, -size);
4519                 if (xi->value) {
4520                         if (new_size > size)
4521                                 goto set_new_name_value;
4522
4523                         /* Now replace the old value with new one. */
4524                         if (local)
4525                                 xe->xe_value_size = cpu_to_le64(xi->value_len);
4526                         else
4527                                 xe->xe_value_size = 0;
4528
4529                         val = ocfs2_xattr_bucket_get_val(inode,
4530                                                          xs->bucket, offs);
4531                         memset(val + OCFS2_XATTR_SIZE(name_len), 0,
4532                                size - OCFS2_XATTR_SIZE(name_len));
4533                         if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
4534                                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
4535                                        xi->value, xi->value_len);
4536
4537                         le16_add_cpu(&xh->xh_name_value_len, new_size);
4538                         ocfs2_xattr_set_local(xe, local);
4539                         return;
4540                 } else {
4541                         /*
4542                          * Remove the old entry if there is more than one.
4543                          * We don't remove the last entry so that we can
4544                          * use it to indicate the hash value of the empty
4545                          * bucket.
4546                          */
4547                         last -= 1;
4548                         le16_add_cpu(&xh->xh_count, -1);
4549                         if (xh->xh_count) {
4550                                 memmove(xe, xe + 1,
4551                                         (void *)last - (void *)xe);
4552                                 memset(last, 0,
4553                                        sizeof(struct ocfs2_xattr_entry));
4554                         } else
4555                                 xh->xh_free_start =
4556                                         cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4557
4558                         return;
4559                 }
4560         } else {
4561                 /* find a new entry for insert. */
4562                 int low = 0, high = count - 1, tmp;
4563                 struct ocfs2_xattr_entry *tmp_xe;
4564
4565                 while (low <= high && count) {
4566                         tmp = (low + high) / 2;
4567                         tmp_xe = &xh->xh_entries[tmp];
4568
4569                         if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
4570                                 low = tmp + 1;
4571                         else if (name_hash <
4572                                  le32_to_cpu(tmp_xe->xe_name_hash))
4573                                 high = tmp - 1;
4574                         else {
4575                                 low = tmp;
4576                                 break;
4577                         }
4578                 }
4579
4580                 xe = &xh->xh_entries[low];
4581                 if (low != count)
4582                         memmove(xe + 1, xe, (void *)last - (void *)xe);
4583
4584                 le16_add_cpu(&xh->xh_count, 1);
4585                 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
4586                 xe->xe_name_hash = cpu_to_le32(name_hash);
4587                 xe->xe_name_len = name_len;
4588                 ocfs2_xattr_set_type(xe, xi->name_index);
4589         }
4590
4591 set_new_name_value:
4592         /* Insert the new name+value. */
4593         size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
4594
4595         /*
4596          * We must make sure that the name/value pair
4597          * exists in the same block.
4598          */
4599         offs = le16_to_cpu(xh->xh_free_start);
4600         start = offs - size;
4601
4602         if (start >> inode->i_sb->s_blocksize_bits !=
4603             (offs - 1) >> inode->i_sb->s_blocksize_bits) {
4604                 offs = offs - offs % blocksize;
4605                 xh->xh_free_start = cpu_to_le16(offs);
4606         }
4607
4608         val = ocfs2_xattr_bucket_get_val(inode, xs->bucket, offs - size);
4609         xe->xe_name_offset = cpu_to_le16(offs - size);
4610
4611         memset(val, 0, size);
4612         memcpy(val, xi->name, name_len);
4613         memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
4614
4615         xe->xe_value_size = cpu_to_le64(xi->value_len);
4616         ocfs2_xattr_set_local(xe, local);
4617         xs->here = xe;
4618         le16_add_cpu(&xh->xh_free_start, -size);
4619         le16_add_cpu(&xh->xh_name_value_len, size);
4620
4621         return;
4622 }
4623
4624 /*
4625  * Set the xattr entry in the specified bucket.
4626  * The bucket is indicated by xs->bucket and it should have the enough
4627  * space for the xattr insertion.
4628  */
4629 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
4630                                            handle_t *handle,
4631                                            struct ocfs2_xattr_info *xi,
4632                                            struct ocfs2_xattr_search *xs,
4633                                            u32 name_hash,
4634                                            int local)
4635 {
4636         int ret;
4637         u64 blkno;
4638
4639         mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
4640              (unsigned long)xi->value_len, xi->name_index,
4641              (unsigned long long)bucket_blkno(xs->bucket));
4642
4643         if (!xs->bucket->bu_bhs[1]) {
4644                 blkno = bucket_blkno(xs->bucket);
4645                 ocfs2_xattr_bucket_relse(xs->bucket);
4646                 ret = ocfs2_read_xattr_bucket(xs->bucket, blkno);
4647                 if (ret) {
4648                         mlog_errno(ret);
4649                         goto out;
4650                 }
4651         }
4652
4653         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4654                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4655         if (ret < 0) {
4656                 mlog_errno(ret);
4657                 goto out;
4658         }
4659
4660         ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
4661         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4662
4663 out:
4664         return ret;
4665 }
4666
4667 /*
4668  * Truncate the specified xe_off entry in xattr bucket.
4669  * bucket is indicated by header_bh and len is the new length.
4670  * Both the ocfs2_xattr_value_root and the entry will be updated here.
4671  *
4672  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
4673  */
4674 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
4675                                              struct ocfs2_xattr_bucket *bucket,
4676                                              int xe_off,
4677                                              int len,
4678                                              struct ocfs2_xattr_set_ctxt *ctxt)
4679 {
4680         int ret, offset;
4681         u64 value_blk;
4682         struct buffer_head *value_bh = NULL;
4683         struct ocfs2_xattr_value_root *xv;
4684         struct ocfs2_xattr_entry *xe;
4685         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4686         size_t blocksize = inode->i_sb->s_blocksize;
4687
4688         xe = &xh->xh_entries[xe_off];
4689
4690         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
4691
4692         offset = le16_to_cpu(xe->xe_name_offset) +
4693                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4694
4695         value_blk = offset / blocksize;
4696
4697         /* We don't allow ocfs2_xattr_value to be stored in different block. */
4698         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
4699
4700         value_bh = bucket->bu_bhs[value_blk];
4701         BUG_ON(!value_bh);
4702
4703         xv = (struct ocfs2_xattr_value_root *)
4704                 (value_bh->b_data + offset % blocksize);
4705
4706         ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
4707                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4708         if (ret) {
4709                 mlog_errno(ret);
4710                 goto out;
4711         }
4712
4713         /*
4714          * From here on out we have to dirty the bucket.  The generic
4715          * value calls only modify one of the bucket's bhs, but we need
4716          * to send the bucket at once.  So if they error, they *could* have
4717          * modified something.  We have to assume they did, and dirty
4718          * the whole bucket.  This leaves us in a consistent state.
4719          */
4720         mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
4721              xe_off, (unsigned long long)bucket_blkno(bucket), len);
4722         ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len, ctxt);
4723         if (ret) {
4724                 mlog_errno(ret);
4725                 goto out_dirty;
4726         }
4727
4728         xe->xe_value_size = cpu_to_le64(len);
4729
4730 out_dirty:
4731         ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
4732
4733 out:
4734         return ret;
4735 }
4736
4737 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
4738                                         struct ocfs2_xattr_search *xs,
4739                                         int len,
4740                                         struct ocfs2_xattr_set_ctxt *ctxt)
4741 {
4742         int ret, offset;
4743         struct ocfs2_xattr_entry *xe = xs->here;
4744         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
4745
4746         BUG_ON(!xs->bucket->bu_bhs[0] || !xe || ocfs2_xattr_is_local(xe));
4747
4748         offset = xe - xh->xh_entries;
4749         ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket,
4750                                                 offset, len, ctxt);
4751         if (ret)
4752                 mlog_errno(ret);
4753
4754         return ret;
4755 }
4756
4757 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
4758                                                 handle_t *handle,
4759                                                 struct ocfs2_xattr_search *xs,
4760                                                 char *val,
4761                                                 int value_len)
4762 {
4763         int offset;
4764         struct ocfs2_xattr_value_root *xv;
4765         struct ocfs2_xattr_entry *xe = xs->here;
4766
4767         BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
4768
4769         offset = le16_to_cpu(xe->xe_name_offset) +
4770                  OCFS2_XATTR_SIZE(xe->xe_name_len);
4771
4772         xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
4773
4774         return __ocfs2_xattr_set_value_outside(inode, handle,
4775                                                xv, val, value_len);
4776 }
4777
4778 static int ocfs2_rm_xattr_cluster(struct inode *inode,
4779                                   struct buffer_head *root_bh,
4780                                   u64 blkno,
4781                                   u32 cpos,
4782                                   u32 len)
4783 {
4784         int ret;
4785         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4786         struct inode *tl_inode = osb->osb_tl_inode;
4787         handle_t *handle;
4788         struct ocfs2_xattr_block *xb =
4789                         (struct ocfs2_xattr_block *)root_bh->b_data;
4790         struct ocfs2_alloc_context *meta_ac = NULL;
4791         struct ocfs2_cached_dealloc_ctxt dealloc;
4792         struct ocfs2_extent_tree et;
4793
4794         ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
4795
4796         ocfs2_init_dealloc_ctxt(&dealloc);
4797
4798         mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
4799              cpos, len, (unsigned long long)blkno);
4800
4801         ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
4802
4803         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
4804         if (ret) {
4805                 mlog_errno(ret);
4806                 return ret;
4807         }
4808
4809         mutex_lock(&tl_inode->i_mutex);
4810
4811         if (ocfs2_truncate_log_needs_flush(osb)) {
4812                 ret = __ocfs2_flush_truncate_log(osb);
4813                 if (ret < 0) {
4814                         mlog_errno(ret);
4815                         goto out;
4816                 }
4817         }
4818
4819         handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
4820         if (IS_ERR(handle)) {
4821                 ret = -ENOMEM;
4822                 mlog_errno(ret);
4823                 goto out;
4824         }
4825
4826         ret = ocfs2_journal_access(handle, inode, root_bh,
4827                                    OCFS2_JOURNAL_ACCESS_WRITE);
4828         if (ret) {
4829                 mlog_errno(ret);
4830                 goto out_commit;
4831         }
4832
4833         ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
4834                                   &dealloc);
4835         if (ret) {
4836                 mlog_errno(ret);
4837                 goto out_commit;
4838         }
4839
4840         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
4841
4842         ret = ocfs2_journal_dirty(handle, root_bh);
4843         if (ret) {
4844                 mlog_errno(ret);
4845                 goto out_commit;
4846         }
4847
4848         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
4849         if (ret)
4850                 mlog_errno(ret);
4851
4852 out_commit:
4853         ocfs2_commit_trans(osb, handle);
4854 out:
4855         ocfs2_schedule_truncate_log_flush(osb, 1);
4856
4857         mutex_unlock(&tl_inode->i_mutex);
4858
4859         if (meta_ac)
4860                 ocfs2_free_alloc_context(meta_ac);
4861
4862         ocfs2_run_deallocs(osb, &dealloc);
4863
4864         return ret;
4865 }
4866
4867 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
4868                                          handle_t *handle,
4869                                          struct ocfs2_xattr_search *xs)
4870 {
4871         struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
4872         struct ocfs2_xattr_entry *last = &xh->xh_entries[
4873                                                 le16_to_cpu(xh->xh_count) - 1];
4874         int ret = 0;
4875
4876         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4877                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4878         if (ret) {
4879                 mlog_errno(ret);
4880                 return;
4881         }
4882
4883         /* Remove the old entry. */
4884         memmove(xs->here, xs->here + 1,
4885                 (void *)last - (void *)xs->here);
4886         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
4887         le16_add_cpu(&xh->xh_count, -1);
4888
4889         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4890 }
4891
4892 /*
4893  * Set the xattr name/value in the bucket specified in xs.
4894  *
4895  * As the new value in xi may be stored in the bucket or in an outside cluster,
4896  * we divide the whole process into 3 steps:
4897  * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
4898  * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
4899  * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
4900  * 4. If the clusters for the new outside value can't be allocated, we need
4901  *    to free the xattr we allocated in set.
4902  */
4903 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
4904                                      struct ocfs2_xattr_info *xi,
4905                                      struct ocfs2_xattr_search *xs,
4906                                      struct ocfs2_xattr_set_ctxt *ctxt)
4907 {
4908         int ret, local = 1;
4909         size_t value_len;
4910         char *val = (char *)xi->value;
4911         struct ocfs2_xattr_entry *xe = xs->here;
4912         u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
4913                                               strlen(xi->name));
4914
4915         if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
4916                 /*
4917                  * We need to truncate the xattr storage first.
4918                  *
4919                  * If both the old and new value are stored to
4920                  * outside block, we only need to truncate
4921                  * the storage and then set the value outside.
4922                  *
4923                  * If the new value should be stored within block,
4924                  * we should free all the outside block first and
4925                  * the modification to the xattr block will be done
4926                  * by following steps.
4927                  */
4928                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
4929                         value_len = xi->value_len;
4930                 else
4931                         value_len = 0;
4932
4933                 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4934                                                            value_len,
4935                                                            ctxt);
4936                 if (ret)
4937                         goto out;
4938
4939                 if (value_len)
4940                         goto set_value_outside;
4941         }
4942
4943         value_len = xi->value_len;
4944         /* So we have to handle the inside block change now. */
4945         if (value_len > OCFS2_XATTR_INLINE_SIZE) {
4946                 /*
4947                  * If the new value will be stored outside of block,
4948                  * initalize a new empty value root and insert it first.
4949                  */
4950                 local = 0;
4951                 xi->value = &def_xv;
4952                 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
4953         }
4954
4955         ret = ocfs2_xattr_set_entry_in_bucket(inode, ctxt->handle, xi, xs,
4956                                               name_hash, local);
4957         if (ret) {
4958                 mlog_errno(ret);
4959                 goto out;
4960         }
4961
4962         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
4963                 goto out;
4964
4965         /* allocate the space now for the outside block storage. */
4966         ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
4967                                                    value_len, ctxt);
4968         if (ret) {
4969                 mlog_errno(ret);
4970
4971                 if (xs->not_found) {
4972                         /*
4973                          * We can't allocate enough clusters for outside
4974                          * storage and we have allocated xattr already,
4975                          * so need to remove it.
4976                          */
4977                         ocfs2_xattr_bucket_remove_xs(inode, ctxt->handle, xs);
4978                 }
4979                 goto out;
4980         }
4981
4982 set_value_outside:
4983         ret = ocfs2_xattr_bucket_set_value_outside(inode, ctxt->handle,
4984                                                    xs, val, value_len);
4985 out:
4986         return ret;
4987 }
4988
4989 /*
4990  * check whether the xattr bucket is filled up with the same hash value.
4991  * If we want to insert the xattr with the same hash, return -ENOSPC.
4992  * If we want to insert a xattr with different hash value, go ahead
4993  * and ocfs2_divide_xattr_bucket will handle this.
4994  */
4995 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
4996                                               struct ocfs2_xattr_bucket *bucket,
4997                                               const char *name)
4998 {
4999         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5000         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5001
5002         if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5003                 return 0;
5004
5005         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5006             xh->xh_entries[0].xe_name_hash) {
5007                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5008                      "hash = %u\n",
5009                      (unsigned long long)bucket_blkno(bucket),
5010                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5011                 return -ENOSPC;
5012         }
5013
5014         return 0;
5015 }
5016
5017 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5018                                              struct ocfs2_xattr_info *xi,
5019                                              struct ocfs2_xattr_search *xs,
5020                                              struct ocfs2_xattr_set_ctxt *ctxt)
5021 {
5022         struct ocfs2_xattr_header *xh;
5023         struct ocfs2_xattr_entry *xe;
5024         u16 count, header_size, xh_free_start;
5025         int free, max_free, need, old;
5026         size_t value_size = 0, name_len = strlen(xi->name);
5027         size_t blocksize = inode->i_sb->s_blocksize;
5028         int ret, allocation = 0;
5029
5030         mlog_entry("Set xattr %s in xattr index block\n", xi->name);
5031
5032 try_again:
5033         xh = xs->header;
5034         count = le16_to_cpu(xh->xh_count);
5035         xh_free_start = le16_to_cpu(xh->xh_free_start);
5036         header_size = sizeof(struct ocfs2_xattr_header) +
5037                         count * sizeof(struct ocfs2_xattr_entry);
5038         max_free = OCFS2_XATTR_BUCKET_SIZE -
5039                 le16_to_cpu(xh->xh_name_value_len) - header_size;
5040
5041         mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
5042                         "of %u which exceed block size\n",
5043                         (unsigned long long)bucket_blkno(xs->bucket),
5044                         header_size);
5045
5046         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
5047                 value_size = OCFS2_XATTR_ROOT_SIZE;
5048         else if (xi->value)
5049                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
5050
5051         if (xs->not_found)
5052                 need = sizeof(struct ocfs2_xattr_entry) +
5053                         OCFS2_XATTR_SIZE(name_len) + value_size;
5054         else {
5055                 need = value_size + OCFS2_XATTR_SIZE(name_len);
5056
5057                 /*
5058                  * We only replace the old value if the new length is smaller
5059                  * than the old one. Otherwise we will allocate new space in the
5060                  * bucket to store it.
5061                  */
5062                 xe = xs->here;
5063                 if (ocfs2_xattr_is_local(xe))
5064                         old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
5065                 else
5066                         old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
5067
5068                 if (old >= value_size)
5069                         need = 0;
5070         }
5071
5072         free = xh_free_start - header_size;
5073         /*
5074          * We need to make sure the new name/value pair
5075          * can exist in the same block.
5076          */
5077         if (xh_free_start % blocksize < need)
5078                 free -= xh_free_start % blocksize;
5079
5080         mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
5081              "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
5082              " %u\n", xs->not_found,
5083              (unsigned long long)bucket_blkno(xs->bucket),
5084              free, need, max_free, le16_to_cpu(xh->xh_free_start),
5085              le16_to_cpu(xh->xh_name_value_len));
5086
5087         if (free < need ||
5088             (xs->not_found &&
5089              count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb))) {
5090                 if (need <= max_free &&
5091                     count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
5092                         /*
5093                          * We can create the space by defragment. Since only the
5094                          * name/value will be moved, the xe shouldn't be changed
5095                          * in xs.
5096                          */
5097                         ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5098                                                         xs->bucket);
5099                         if (ret) {
5100                                 mlog_errno(ret);
5101                                 goto out;
5102                         }
5103
5104                         xh_free_start = le16_to_cpu(xh->xh_free_start);
5105                         free = xh_free_start - header_size;
5106                         if (xh_free_start % blocksize < need)
5107                                 free -= xh_free_start % blocksize;
5108
5109                         if (free >= need)
5110                                 goto xattr_set;
5111
5112                         mlog(0, "Can't get enough space for xattr insert by "
5113                              "defragment. Need %u bytes, but we have %d, so "
5114                              "allocate new bucket for it.\n", need, free);
5115                 }
5116
5117                 /*
5118                  * We have to add new buckets or clusters and one
5119                  * allocation should leave us enough space for insert.
5120                  */
5121                 BUG_ON(allocation);
5122
5123                 /*
5124                  * We do not allow for overlapping ranges between buckets. And
5125                  * the maximum number of collisions we will allow for then is
5126                  * one bucket's worth, so check it here whether we need to
5127                  * add a new bucket for the insert.
5128                  */
5129                 ret = ocfs2_check_xattr_bucket_collision(inode,
5130                                                          xs->bucket,
5131                                                          xi->name);
5132                 if (ret) {
5133                         mlog_errno(ret);
5134                         goto out;
5135                 }
5136
5137                 ret = ocfs2_add_new_xattr_bucket(inode,
5138                                                  xs->xattr_bh,
5139                                                  xs->bucket->bu_bhs[0],
5140                                                  ctxt);
5141                 if (ret) {
5142                         mlog_errno(ret);
5143                         goto out;
5144                 }
5145
5146                 ocfs2_xattr_bucket_relse(xs->bucket);
5147
5148                 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5149                                                    xi->name_index,
5150                                                    xi->name, xs);
5151                 if (ret && ret != -ENODATA)
5152                         goto out;
5153                 xs->not_found = ret;
5154                 allocation = 1;
5155                 goto try_again;
5156         }
5157
5158 xattr_set:
5159         ret = ocfs2_xattr_set_in_bucket(inode, xi, xs, ctxt);
5160 out:
5161         mlog_exit(ret);
5162         return ret;
5163 }
5164
5165 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5166                                         struct ocfs2_xattr_bucket *bucket,
5167                                         void *para)
5168 {
5169         int ret = 0;
5170         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5171         u16 i;
5172         struct ocfs2_xattr_entry *xe;
5173         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5174         struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5175         int credits = ocfs2_remove_extent_credits(osb->sb) +
5176                 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5177
5178
5179         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5180
5181         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5182                 xe = &xh->xh_entries[i];
5183                 if (ocfs2_xattr_is_local(xe))
5184                         continue;
5185
5186                 ctxt.handle = ocfs2_start_trans(osb, credits);
5187                 if (IS_ERR(ctxt.handle)) {
5188                         ret = PTR_ERR(ctxt.handle);
5189                         mlog_errno(ret);
5190                         break;
5191                 }
5192
5193                 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5194                                                         i, 0, &ctxt);
5195
5196                 ocfs2_commit_trans(osb, ctxt.handle);
5197                 if (ret) {
5198                         mlog_errno(ret);
5199                         break;
5200                 }
5201         }
5202
5203         ocfs2_schedule_truncate_log_flush(osb, 1);
5204         ocfs2_run_deallocs(osb, &ctxt.dealloc);
5205         return ret;
5206 }
5207
5208 static int ocfs2_delete_xattr_index_block(struct inode *inode,
5209                                           struct buffer_head *xb_bh)
5210 {
5211         struct ocfs2_xattr_block *xb =
5212                         (struct ocfs2_xattr_block *)xb_bh->b_data;
5213         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
5214         int ret = 0;
5215         u32 name_hash = UINT_MAX, e_cpos, num_clusters;
5216         u64 p_blkno;
5217
5218         if (le16_to_cpu(el->l_next_free_rec) == 0)
5219                 return 0;
5220
5221         while (name_hash > 0) {
5222                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
5223                                           &e_cpos, &num_clusters, el);
5224                 if (ret) {
5225                         mlog_errno(ret);
5226                         goto out;
5227                 }
5228
5229                 ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
5230                                                   ocfs2_delete_xattr_in_bucket,
5231                                                   NULL);
5232                 if (ret) {
5233                         mlog_errno(ret);
5234                         goto out;
5235                 }
5236
5237                 ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
5238                                              p_blkno, e_cpos, num_clusters);
5239                 if (ret) {
5240                         mlog_errno(ret);
5241                         break;
5242                 }
5243
5244                 if (e_cpos == 0)
5245                         break;
5246
5247                 name_hash = e_cpos - 1;
5248         }
5249
5250 out:
5251         return ret;
5252 }
5253
5254 /*
5255  * 'security' attributes support
5256  */
5257 static size_t ocfs2_xattr_security_list(struct inode *inode, char *list,
5258                                         size_t list_size, const char *name,
5259                                         size_t name_len)
5260 {
5261         const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
5262         const size_t total_len = prefix_len + name_len + 1;
5263
5264         if (list && total_len <= list_size) {
5265                 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
5266                 memcpy(list + prefix_len, name, name_len);
5267                 list[prefix_len + name_len] = '\0';
5268         }
5269         return total_len;
5270 }
5271
5272 static int ocfs2_xattr_security_get(struct inode *inode, const char *name,
5273                                     void *buffer, size_t size)
5274 {
5275         if (strcmp(name, "") == 0)
5276                 return -EINVAL;
5277         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_SECURITY, name,
5278                                buffer, size);
5279 }
5280
5281 static int ocfs2_xattr_security_set(struct inode *inode, const char *name,
5282                                     const void *value, size_t size, int flags)
5283 {
5284         if (strcmp(name, "") == 0)
5285                 return -EINVAL;
5286
5287         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY, name, value,
5288                                size, flags);
5289 }
5290
5291 int ocfs2_init_security_get(struct inode *inode,
5292                             struct inode *dir,
5293                             struct ocfs2_security_xattr_info *si)
5294 {
5295         return security_inode_init_security(inode, dir, &si->name, &si->value,
5296                                             &si->value_len);
5297 }
5298
5299 int ocfs2_init_security_set(handle_t *handle,
5300                             struct inode *inode,
5301                             struct buffer_head *di_bh,
5302                             struct ocfs2_security_xattr_info *si,
5303                             struct ocfs2_alloc_context *xattr_ac,
5304                             struct ocfs2_alloc_context *data_ac)
5305 {
5306         return ocfs2_xattr_set_handle(handle, inode, di_bh,
5307                                      OCFS2_XATTR_INDEX_SECURITY,
5308                                      si->name, si->value, si->value_len, 0,
5309                                      xattr_ac, data_ac);
5310 }
5311
5312 struct xattr_handler ocfs2_xattr_security_handler = {
5313         .prefix = XATTR_SECURITY_PREFIX,
5314         .list   = ocfs2_xattr_security_list,
5315         .get    = ocfs2_xattr_security_get,
5316         .set    = ocfs2_xattr_security_set,
5317 };
5318
5319 /*
5320  * 'trusted' attributes support
5321  */
5322 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
5323                                        size_t list_size, const char *name,
5324                                        size_t name_len)
5325 {
5326         const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
5327         const size_t total_len = prefix_len + name_len + 1;
5328
5329         if (list && total_len <= list_size) {
5330                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
5331                 memcpy(list + prefix_len, name, name_len);
5332                 list[prefix_len + name_len] = '\0';
5333         }
5334         return total_len;
5335 }
5336
5337 static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
5338                                    void *buffer, size_t size)
5339 {
5340         if (strcmp(name, "") == 0)
5341                 return -EINVAL;
5342         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
5343                                buffer, size);
5344 }
5345
5346 static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
5347                                    const void *value, size_t size, int flags)
5348 {
5349         if (strcmp(name, "") == 0)
5350                 return -EINVAL;
5351
5352         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
5353                                size, flags);
5354 }
5355
5356 struct xattr_handler ocfs2_xattr_trusted_handler = {
5357         .prefix = XATTR_TRUSTED_PREFIX,
5358         .list   = ocfs2_xattr_trusted_list,
5359         .get    = ocfs2_xattr_trusted_get,
5360         .set    = ocfs2_xattr_trusted_set,
5361 };
5362
5363 /*
5364  * 'user' attributes support
5365  */
5366 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
5367                                     size_t list_size, const char *name,
5368                                     size_t name_len)
5369 {
5370         const size_t prefix_len = XATTR_USER_PREFIX_LEN;
5371         const size_t total_len = prefix_len + name_len + 1;
5372         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5373
5374         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5375                 return 0;
5376
5377         if (list && total_len <= list_size) {
5378                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
5379                 memcpy(list + prefix_len, name, name_len);
5380                 list[prefix_len + name_len] = '\0';
5381         }
5382         return total_len;
5383 }
5384
5385 static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
5386                                 void *buffer, size_t size)
5387 {
5388         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5389
5390         if (strcmp(name, "") == 0)
5391                 return -EINVAL;
5392         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5393                 return -EOPNOTSUPP;
5394         return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
5395                                buffer, size);
5396 }
5397
5398 static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
5399                                 const void *value, size_t size, int flags)
5400 {
5401         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5402
5403         if (strcmp(name, "") == 0)
5404                 return -EINVAL;
5405         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
5406                 return -EOPNOTSUPP;
5407
5408         return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
5409                                size, flags);
5410 }
5411
5412 struct xattr_handler ocfs2_xattr_user_handler = {
5413         .prefix = XATTR_USER_PREFIX,
5414         .list   = ocfs2_xattr_user_list,
5415         .get    = ocfs2_xattr_user_get,
5416         .set    = ocfs2_xattr_user_set,
5417 };