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root/fs/ocfs2/xattr.c

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DEFINITIONS

This source file includes following definitions.
  1. ocfs2_xattr_prefix
  2. ocfs2_xattr_name_hash
  3. ocfs2_xattr_hash_entry
  4. ocfs2_xattr_extend_allocation
  5. __ocfs2_remove_xattr_range
  6. ocfs2_xattr_shrink_size
  7. ocfs2_xattr_value_truncate
  8. ocfs2_xattr_list_entry
  9. ocfs2_xattr_list_entries
  10. ocfs2_xattr_ibody_list
  11. ocfs2_xattr_block_list
  12. ocfs2_listxattr
  13. ocfs2_xattr_find_entry
  14. ocfs2_xattr_get_value_outside
  15. ocfs2_xattr_ibody_get
  16. ocfs2_xattr_block_get
  17. ocfs2_xattr_get
  18. __ocfs2_xattr_set_value_outside
  19. ocfs2_xattr_cleanup
  20. ocfs2_xattr_update_entry
  21. ocfs2_xattr_set_value_outside
  22. ocfs2_xattr_set_entry_local
  23. ocfs2_xattr_set_entry
  24. ocfs2_remove_value_outside
  25. ocfs2_xattr_ibody_remove
  26. ocfs2_xattr_block_remove
  27. ocfs2_xattr_free_block
  28. ocfs2_xattr_remove
  29. ocfs2_xattr_has_space_inline
  30. ocfs2_xattr_ibody_find
  31. ocfs2_xattr_ibody_set
  32. ocfs2_xattr_block_find
  33. ocfs2_restore_xattr_block
  34. ocfs2_xattr_block_set
  35. ocfs2_xattr_set
  36. ocfs2_xattr_get_rec
  37. ocfs2_find_xe_in_bucket
  38. ocfs2_xattr_bucket_find
  39. ocfs2_xattr_index_block_find
  40. ocfs2_iterate_xattr_buckets
  41. ocfs2_xattr_bucket_get_name_value
  42. ocfs2_list_xattr_bucket
  43. ocfs2_xattr_tree_list_index_block
  44. cmp_xe
  45. swap_xe
  46. ocfs2_cp_xattr_block_to_bucket
  47. ocfs2_xattr_update_xattr_search
  48. ocfs2_xattr_create_index_block
  49. cmp_xe_offset
  50. ocfs2_defrag_xattr_bucket
  51. ocfs2_mv_xattr_bucket_cross_cluster
  52. ocfs2_read_xattr_bucket
  53. ocfs2_half_xattr_bucket
  54. ocfs2_cp_xattr_bucket
  55. ocfs2_cp_xattr_cluster
  56. ocfs2_half_xattr_cluster
  57. ocfs2_adjust_xattr_cross_cluster
  58. ocfs2_add_new_xattr_cluster
  59. ocfs2_extend_xattr_bucket
  60. ocfs2_add_new_xattr_bucket
  61. ocfs2_xattr_bucket_get_val
  62. ocfs2_xattr_set_entry_normal
  63. ocfs2_xattr_bucket_handle_journal
  64. ocfs2_xattr_set_entry_in_bucket
  65. ocfs2_xattr_value_update_size
  66. ocfs2_xattr_bucket_value_truncate
  67. ocfs2_xattr_bucket_value_truncate_xs
  68. ocfs2_xattr_bucket_set_value_outside
  69. ocfs2_rm_xattr_cluster
  70. ocfs2_xattr_bucket_remove_xs
  71. ocfs2_xattr_set_in_bucket
  72. ocfs2_check_xattr_bucket_collision
  73. ocfs2_xattr_set_entry_index_block
  74. ocfs2_delete_xattr_in_bucket
  75. ocfs2_delete_xattr_index_block
  76. ocfs2_xattr_trusted_list
  77. ocfs2_xattr_trusted_get
  78. ocfs2_xattr_trusted_set
  79. ocfs2_xattr_user_list
  80. ocfs2_xattr_user_get
  81. ocfs2_xattr_user_set

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * xattr.c
 *
 * Copyright (C) 2008 Oracle.  All rights reserved.
 *
 * CREDITS:
 * Lots of code in this file is taken from ext3.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/uio.h>
#include <linux/sched.h>
#include <linux/splice.h>
#include <linux/mount.h>
#include <linux/writeback.h>
#include <linux/falloc.h>
#include <linux/sort.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>

#define MLOG_MASK_PREFIX ML_XATTR
#include <cluster/masklog.h>

#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "file.h"
#include "symlink.h"
#include "sysfile.h"
#include "inode.h"
#include "journal.h"
#include "ocfs2_fs.h"
#include "suballoc.h"
#include "uptodate.h"
#include "buffer_head_io.h"
#include "super.h"
#include "xattr.h"


struct ocfs2_xattr_def_value_root {
        struct ocfs2_xattr_value_root   xv;
        struct ocfs2_extent_rec         er;
};

struct ocfs2_xattr_bucket {
        struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
        struct ocfs2_xattr_header *xh;
};

#define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
#define OCFS2_XATTR_INLINE_SIZE 80

static struct ocfs2_xattr_def_value_root def_xv = {
        .xv.xr_list.l_count = cpu_to_le16(1),
};

struct xattr_handler *ocfs2_xattr_handlers[] = {
        &ocfs2_xattr_user_handler,
        &ocfs2_xattr_trusted_handler,
        NULL
};

static struct xattr_handler *ocfs2_xattr_handler_map[] = {
        [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
        [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
};

struct ocfs2_xattr_info {
        int name_index;
        const char *name;
        const void *value;
        size_t value_len;
};

struct ocfs2_xattr_search {
        struct buffer_head *inode_bh;
        /*
         * xattr_bh point to the block buffer head which has extended attribute
         * when extended attribute in inode, xattr_bh is equal to inode_bh.
         */
        struct buffer_head *xattr_bh;
        struct ocfs2_xattr_header *header;
        struct ocfs2_xattr_bucket bucket;
        void *base;
        void *end;
        struct ocfs2_xattr_entry *here;
        int not_found;
};

static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
                                             struct ocfs2_xattr_header *xh,
                                             int index,
                                             int *block_off,
                                             int *new_offset);

static int ocfs2_xattr_index_block_find(struct inode *inode,
                                        struct buffer_head *root_bh,
                                        int name_index,
                                        const char *name,
                                        struct ocfs2_xattr_search *xs);

static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
                                        struct ocfs2_xattr_tree_root *xt,
                                        char *buffer,
                                        size_t buffer_size);

static int ocfs2_xattr_create_index_block(struct inode *inode,
                                          struct ocfs2_xattr_search *xs);

static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
                                             struct ocfs2_xattr_info *xi,
                                             struct ocfs2_xattr_search *xs);

static int ocfs2_delete_xattr_index_block(struct inode *inode,
                                          struct buffer_head *xb_bh);

static inline const char *ocfs2_xattr_prefix(int name_index)
{
        struct xattr_handler *handler = NULL;

        if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
                handler = ocfs2_xattr_handler_map[name_index];

        return handler ? handler->prefix : NULL;
}

static u32 ocfs2_xattr_name_hash(struct inode *inode,
                                 const char *name,
                                 int name_len)
{
        /* Get hash value of uuid from super block */
        u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
        int i;

        /* hash extended attribute name */
        for (i = 0; i < name_len; i++) {
                hash = (hash << OCFS2_HASH_SHIFT) ^
                       (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
                       *name++;
        }

        return hash;
}

/*
 * ocfs2_xattr_hash_entry()
 *
 * Compute the hash of an extended attribute.
 */
static void ocfs2_xattr_hash_entry(struct inode *inode,
                                   struct ocfs2_xattr_header *header,
                                   struct ocfs2_xattr_entry *entry)
{
        u32 hash = 0;
        char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);

        hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
        entry->xe_name_hash = cpu_to_le32(hash);

        return;
}

static int ocfs2_xattr_extend_allocation(struct inode *inode,
                                         u32 clusters_to_add,
                                         struct buffer_head *xattr_bh,
                                         struct ocfs2_xattr_value_root *xv)
{
        int status = 0;
        int restart_func = 0;
        int credits = 0;
        handle_t *handle = NULL;
        struct ocfs2_alloc_context *data_ac = NULL;
        struct ocfs2_alloc_context *meta_ac = NULL;
        enum ocfs2_alloc_restarted why;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
        struct ocfs2_extent_tree et;

        mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);

        ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);

restart_all:

        status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
                                       &data_ac, &meta_ac);
        if (status) {
                mlog_errno(status);
                goto leave;
        }

        credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
                                            clusters_to_add);
        handle = ocfs2_start_trans(osb, credits);
        if (IS_ERR(handle)) {
                status = PTR_ERR(handle);
                handle = NULL;
                mlog_errno(status);
                goto leave;
        }

restarted_transaction:
        status = ocfs2_journal_access(handle, inode, xattr_bh,
                                      OCFS2_JOURNAL_ACCESS_WRITE);
        if (status < 0) {
                mlog_errno(status);
                goto leave;
        }

        prev_clusters = le32_to_cpu(xv->xr_clusters);
        status = ocfs2_add_clusters_in_btree(osb,
                                             inode,
                                             &logical_start,
                                             clusters_to_add,
                                             0,
                                             &et,
                                             handle,
                                             data_ac,
                                             meta_ac,
                                             &why);
        if ((status < 0) && (status != -EAGAIN)) {
                if (status != -ENOSPC)
                        mlog_errno(status);
                goto leave;
        }

        status = ocfs2_journal_dirty(handle, xattr_bh);
        if (status < 0) {
                mlog_errno(status);
                goto leave;
        }

        clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;

        if (why != RESTART_NONE && clusters_to_add) {
                if (why == RESTART_META) {
                        mlog(0, "restarting function.\n");
                        restart_func = 1;
                } else {
                        BUG_ON(why != RESTART_TRANS);

                        mlog(0, "restarting transaction.\n");
                        /* TODO: This can be more intelligent. */
                        credits = ocfs2_calc_extend_credits(osb->sb,
                                                            et.et_root_el,
                                                            clusters_to_add);
                        status = ocfs2_extend_trans(handle, credits);
                        if (status < 0) {
                                /* handle still has to be committed at
                                 * this point. */
                                status = -ENOMEM;
                                mlog_errno(status);
                                goto leave;
                        }
                        goto restarted_transaction;
                }
        }

leave:
        if (handle) {
                ocfs2_commit_trans(osb, handle);
                handle = NULL;
        }
        if (data_ac) {
                ocfs2_free_alloc_context(data_ac);
                data_ac = NULL;
        }
        if (meta_ac) {
                ocfs2_free_alloc_context(meta_ac);
                meta_ac = NULL;
        }
        if ((!status) && restart_func) {
                restart_func = 0;
                goto restart_all;
        }

        return status;
}

static int __ocfs2_remove_xattr_range(struct inode *inode,
                                      struct buffer_head *root_bh,
                                      struct ocfs2_xattr_value_root *xv,
                                      u32 cpos, u32 phys_cpos, u32 len,
                                      struct ocfs2_cached_dealloc_ctxt *dealloc)
{
        int ret;
        u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        struct inode *tl_inode = osb->osb_tl_inode;
        handle_t *handle;
        struct ocfs2_alloc_context *meta_ac = NULL;
        struct ocfs2_extent_tree et;

        ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);

        ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
        if (ret) {
                mlog_errno(ret);
                return ret;
        }

        mutex_lock(&tl_inode->i_mutex);

        if (ocfs2_truncate_log_needs_flush(osb)) {
                ret = __ocfs2_flush_truncate_log(osb);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out;
                }
        }

        handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_journal_access(handle, inode, root_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
                                  dealloc);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        le32_add_cpu(&xv->xr_clusters, -len);

        ret = ocfs2_journal_dirty(handle, root_bh);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
        if (ret)
                mlog_errno(ret);

out_commit:
        ocfs2_commit_trans(osb, handle);
out:
        mutex_unlock(&tl_inode->i_mutex);

        if (meta_ac)
                ocfs2_free_alloc_context(meta_ac);

        return ret;
}

static int ocfs2_xattr_shrink_size(struct inode *inode,
                                   u32 old_clusters,
                                   u32 new_clusters,
                                   struct buffer_head *root_bh,
                                   struct ocfs2_xattr_value_root *xv)
{
        int ret = 0;
        u32 trunc_len, cpos, phys_cpos, alloc_size;
        u64 block;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        struct ocfs2_cached_dealloc_ctxt dealloc;

        ocfs2_init_dealloc_ctxt(&dealloc);

        if (old_clusters <= new_clusters)
                return 0;

        cpos = new_clusters;
        trunc_len = old_clusters - new_clusters;
        while (trunc_len) {
                ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
                                               &alloc_size, &xv->xr_list);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                if (alloc_size > trunc_len)
                        alloc_size = trunc_len;

                ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
                                                 phys_cpos, alloc_size,
                                                 &dealloc);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
                ocfs2_remove_xattr_clusters_from_cache(inode, block,
                                                       alloc_size);
                cpos += alloc_size;
                trunc_len -= alloc_size;
        }

out:
        ocfs2_schedule_truncate_log_flush(osb, 1);
        ocfs2_run_deallocs(osb, &dealloc);

        return ret;
}

static int ocfs2_xattr_value_truncate(struct inode *inode,
                                      struct buffer_head *root_bh,
                                      struct ocfs2_xattr_value_root *xv,
                                      int len)
{
        int ret;
        u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
        u32 old_clusters = le32_to_cpu(xv->xr_clusters);

        if (new_clusters == old_clusters)
                return 0;

        if (new_clusters > old_clusters)
                ret = ocfs2_xattr_extend_allocation(inode,
                                                    new_clusters - old_clusters,
                                                    root_bh, xv);
        else
                ret = ocfs2_xattr_shrink_size(inode,
                                              old_clusters, new_clusters,
                                              root_bh, xv);

        return ret;
}

static int ocfs2_xattr_list_entry(char *buffer, size_t size,
                                  size_t *result, const char *prefix,
                                  const char *name, int name_len)
{
        char *p = buffer + *result;
        int prefix_len = strlen(prefix);
        int total_len = prefix_len + name_len + 1;

        *result += total_len;

        /* we are just looking for how big our buffer needs to be */
        if (!size)
                return 0;

        if (*result > size)
                return -ERANGE;

        memcpy(p, prefix, prefix_len);
        memcpy(p + prefix_len, name, name_len);
        p[prefix_len + name_len] = '\0';

        return 0;
}

static int ocfs2_xattr_list_entries(struct inode *inode,
                                    struct ocfs2_xattr_header *header,
                                    char *buffer, size_t buffer_size)
{
        size_t result = 0;
        int i, type, ret;
        const char *prefix, *name;

        for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
                struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
                type = ocfs2_xattr_get_type(entry);
                prefix = ocfs2_xattr_prefix(type);

                if (prefix) {
                        name = (const char *)header +
                                le16_to_cpu(entry->xe_name_offset);

                        ret = ocfs2_xattr_list_entry(buffer, buffer_size,
                                                     &result, prefix, name,
                                                     entry->xe_name_len);
                        if (ret)
                                return ret;
                }
        }

        return result;
}

static int ocfs2_xattr_ibody_list(struct inode *inode,
                                  struct ocfs2_dinode *di,
                                  char *buffer,
                                  size_t buffer_size)
{
        struct ocfs2_xattr_header *header = NULL;
        struct ocfs2_inode_info *oi = OCFS2_I(inode);
        int ret = 0;

        if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
                return ret;

        header = (struct ocfs2_xattr_header *)
                 ((void *)di + inode->i_sb->s_blocksize -
                 le16_to_cpu(di->i_xattr_inline_size));

        ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);

        return ret;
}

static int ocfs2_xattr_block_list(struct inode *inode,
                                  struct ocfs2_dinode *di,
                                  char *buffer,
                                  size_t buffer_size)
{
        struct buffer_head *blk_bh = NULL;
        struct ocfs2_xattr_block *xb;
        int ret = 0;

        if (!di->i_xattr_loc)
                return ret;

        ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
        if (ret < 0) {
                mlog_errno(ret);
                return ret;
        }
        /*Verify the signature of xattr block*/
        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
                ret = -EFAULT;
                goto cleanup;
        }

        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;

        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
                struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
                ret = ocfs2_xattr_list_entries(inode, header,
                                               buffer, buffer_size);
        } else {
                struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
                ret = ocfs2_xattr_tree_list_index_block(inode, xt,
                                                   buffer, buffer_size);
        }
cleanup:
        brelse(blk_bh);

        return ret;
}

ssize_t ocfs2_listxattr(struct dentry *dentry,
                        char *buffer,
                        size_t size)
{
        int ret = 0, i_ret = 0, b_ret = 0;
        struct buffer_head *di_bh = NULL;
        struct ocfs2_dinode *di = NULL;
        struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);

        if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
                return -EOPNOTSUPP;

        if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
                return ret;

        ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
        if (ret < 0) {
                mlog_errno(ret);
                return ret;
        }

        di = (struct ocfs2_dinode *)di_bh->b_data;

        down_read(&oi->ip_xattr_sem);
        i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
        if (i_ret < 0)
                b_ret = 0;
        else {
                if (buffer) {
                        buffer += i_ret;
                        size -= i_ret;
                }
                b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
                                               buffer, size);
                if (b_ret < 0)
                        i_ret = 0;
        }
        up_read(&oi->ip_xattr_sem);
        ocfs2_inode_unlock(dentry->d_inode, 0);

        brelse(di_bh);

        return i_ret + b_ret;
}

static int ocfs2_xattr_find_entry(int name_index,
                                  const char *name,
                                  struct ocfs2_xattr_search *xs)
{
        struct ocfs2_xattr_entry *entry;
        size_t name_len;
        int i, cmp = 1;

        if (name == NULL)
                return -EINVAL;

        name_len = strlen(name);
        entry = xs->here;
        for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
                cmp = name_index - ocfs2_xattr_get_type(entry);
                if (!cmp)
                        cmp = name_len - entry->xe_name_len;
                if (!cmp)
                        cmp = memcmp(name, (xs->base +
                                     le16_to_cpu(entry->xe_name_offset)),
                                     name_len);
                if (cmp == 0)
                        break;
                entry += 1;
        }
        xs->here = entry;

        return cmp ? -ENODATA : 0;
}

static int ocfs2_xattr_get_value_outside(struct inode *inode,
                                         struct ocfs2_xattr_value_root *xv,
                                         void *buffer,
                                         size_t len)
{
        u32 cpos, p_cluster, num_clusters, bpc, clusters;
        u64 blkno;
        int i, ret = 0;
        size_t cplen, blocksize;
        struct buffer_head *bh = NULL;
        struct ocfs2_extent_list *el;

        el = &xv->xr_list;
        clusters = le32_to_cpu(xv->xr_clusters);
        bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
        blocksize = inode->i_sb->s_blocksize;

        cpos = 0;
        while (cpos < clusters) {
                ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
                                               &num_clusters, el);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
                /* Copy ocfs2_xattr_value */
                for (i = 0; i < num_clusters * bpc; i++, blkno++) {
                        ret = ocfs2_read_block(inode, blkno, &bh);
                        if (ret) {
                                mlog_errno(ret);
                                goto out;
                        }

                        cplen = len >= blocksize ? blocksize : len;
                        memcpy(buffer, bh->b_data, cplen);
                        len -= cplen;
                        buffer += cplen;

                        brelse(bh);
                        bh = NULL;
                        if (len == 0)
                                break;
                }
                cpos += num_clusters;
        }
out:
        return ret;
}

static int ocfs2_xattr_ibody_get(struct inode *inode,
                                 int name_index,
                                 const char *name,
                                 void *buffer,
                                 size_t buffer_size,
                                 struct ocfs2_xattr_search *xs)
{
        struct ocfs2_inode_info *oi = OCFS2_I(inode);
        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
        struct ocfs2_xattr_value_root *xv;
        size_t size;
        int ret = 0;

        if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
                return -ENODATA;

        xs->end = (void *)di + inode->i_sb->s_blocksize;
        xs->header = (struct ocfs2_xattr_header *)
                        (xs->end - le16_to_cpu(di->i_xattr_inline_size));
        xs->base = (void *)xs->header;
        xs->here = xs->header->xh_entries;

        ret = ocfs2_xattr_find_entry(name_index, name, xs);
        if (ret)
                return ret;
        size = le64_to_cpu(xs->here->xe_value_size);
        if (buffer) {
                if (size > buffer_size)
                        return -ERANGE;
                if (ocfs2_xattr_is_local(xs->here)) {
                        memcpy(buffer, (void *)xs->base +
                               le16_to_cpu(xs->here->xe_name_offset) +
                               OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
                } else {
                        xv = (struct ocfs2_xattr_value_root *)
                                (xs->base + le16_to_cpu(
                                 xs->here->xe_name_offset) +
                                OCFS2_XATTR_SIZE(xs->here->xe_name_len));
                        ret = ocfs2_xattr_get_value_outside(inode, xv,
                                                            buffer, size);
                        if (ret < 0) {
                                mlog_errno(ret);
                                return ret;
                        }
                }
        }

        return size;
}

static int ocfs2_xattr_block_get(struct inode *inode,
                                 int name_index,
                                 const char *name,
                                 void *buffer,
                                 size_t buffer_size,
                                 struct ocfs2_xattr_search *xs)
{
        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
        struct buffer_head *blk_bh = NULL;
        struct ocfs2_xattr_block *xb;
        struct ocfs2_xattr_value_root *xv;
        size_t size;
        int ret = -ENODATA, name_offset, name_len, block_off, i;

        if (!di->i_xattr_loc)
                return ret;

        memset(&xs->bucket, 0, sizeof(xs->bucket));

        ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
        if (ret < 0) {
                mlog_errno(ret);
                return ret;
        }
        /*Verify the signature of xattr block*/
        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
                ret = -EFAULT;
                goto cleanup;
        }

        xs->xattr_bh = blk_bh;
        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;

        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
                xs->header = &xb->xb_attrs.xb_header;
                xs->base = (void *)xs->header;
                xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
                xs->here = xs->header->xh_entries;

                ret = ocfs2_xattr_find_entry(name_index, name, xs);
        } else
                ret = ocfs2_xattr_index_block_find(inode, blk_bh,
                                                   name_index,
                                                   name, xs);

        if (ret)
                goto cleanup;
        size = le64_to_cpu(xs->here->xe_value_size);
        if (buffer) {
                ret = -ERANGE;
                if (size > buffer_size)
                        goto cleanup;

                name_offset = le16_to_cpu(xs->here->xe_name_offset);
                name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
                i = xs->here - xs->header->xh_entries;

                if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
                        ret = ocfs2_xattr_bucket_get_name_value(inode,
                                                                xs->bucket.xh,
                                                                i,
                                                                &block_off,
                                                                &name_offset);
                        xs->base = xs->bucket.bhs[block_off]->b_data;
                }
                if (ocfs2_xattr_is_local(xs->here)) {
                        memcpy(buffer, (void *)xs->base +
                               name_offset + name_len, size);
                } else {
                        xv = (struct ocfs2_xattr_value_root *)
                                (xs->base + name_offset + name_len);
                        ret = ocfs2_xattr_get_value_outside(inode, xv,
                                                            buffer, size);
                        if (ret < 0) {
                                mlog_errno(ret);
                                goto cleanup;
                        }
                }
        }
        ret = size;
cleanup:
        for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
                brelse(xs->bucket.bhs[i]);
        memset(&xs->bucket, 0, sizeof(xs->bucket));

        brelse(blk_bh);
        return ret;
}

/* ocfs2_xattr_get()
 *
 * Copy an extended attribute into the buffer provided.
 * Buffer is NULL to compute the size of buffer required.
 */
int ocfs2_xattr_get(struct inode *inode,
                    int name_index,
                    const char *name,
                    void *buffer,
                    size_t buffer_size)
{
        int ret;
        struct ocfs2_dinode *di = NULL;
        struct buffer_head *di_bh = NULL;
        struct ocfs2_inode_info *oi = OCFS2_I(inode);
        struct ocfs2_xattr_search xis = {
                .not_found = -ENODATA,
        };
        struct ocfs2_xattr_search xbs = {
                .not_found = -ENODATA,
        };

        if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
                return -EOPNOTSUPP;

        if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
                ret = -ENODATA;

        ret = ocfs2_inode_lock(inode, &di_bh, 0);
        if (ret < 0) {
                mlog_errno(ret);
                return ret;
        }
        xis.inode_bh = xbs.inode_bh = di_bh;
        di = (struct ocfs2_dinode *)di_bh->b_data;

        down_read(&oi->ip_xattr_sem);
        ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
                                    buffer_size, &xis);
        if (ret == -ENODATA)
                ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
                                            buffer_size, &xbs);
        up_read(&oi->ip_xattr_sem);
        ocfs2_inode_unlock(inode, 0);

        brelse(di_bh);

        return ret;
}

static int __ocfs2_xattr_set_value_outside(struct inode *inode,
                                           struct ocfs2_xattr_value_root *xv,
                                           const void *value,
                                           int value_len)
{
        int ret = 0, i, cp_len, credits;
        u16 blocksize = inode->i_sb->s_blocksize;
        u32 p_cluster, num_clusters;
        u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
        u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
        u64 blkno;
        struct buffer_head *bh = NULL;
        handle_t *handle;

        BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));

        credits = clusters * bpc;
        handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                mlog_errno(ret);
                goto out;
        }

        while (cpos < clusters) {
                ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
                                               &num_clusters, &xv->xr_list);
                if (ret) {
                        mlog_errno(ret);
                        goto out_commit;
                }

                blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);

                for (i = 0; i < num_clusters * bpc; i++, blkno++) {
                        ret = ocfs2_read_block(inode, blkno, &bh);
                        if (ret) {
                                mlog_errno(ret);
                                goto out_commit;
                        }

                        ret = ocfs2_journal_access(handle,
                                                   inode,
                                                   bh,
                                                   OCFS2_JOURNAL_ACCESS_WRITE);
                        if (ret < 0) {
                                mlog_errno(ret);
                                goto out_commit;
                        }

                        cp_len = value_len > blocksize ? blocksize : value_len;
                        memcpy(bh->b_data, value, cp_len);
                        value_len -= cp_len;
                        value += cp_len;
                        if (cp_len < blocksize)
                                memset(bh->b_data + cp_len, 0,
                                       blocksize - cp_len);

                        ret = ocfs2_journal_dirty(handle, bh);
                        if (ret < 0) {
                                mlog_errno(ret);
                                goto out_commit;
                        }
                        brelse(bh);
                        bh = NULL;

                        /*
                         * XXX: do we need to empty all the following
                         * blocks in this cluster?
                         */
                        if (!value_len)
                                break;
                }
                cpos += num_clusters;
        }
out_commit:
        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
        brelse(bh);

        return ret;
}

static int ocfs2_xattr_cleanup(struct inode *inode,
                               struct ocfs2_xattr_info *xi,
                               struct ocfs2_xattr_search *xs,
                               size_t offs)
{
        handle_t *handle = NULL;
        int ret = 0;
        size_t name_len = strlen(xi->name);
        void *val = xs->base + offs;
        size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;

        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
                                   OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                mlog_errno(ret);
                goto out;
        }
        ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }
        /* Decrease xattr count */
        le16_add_cpu(&xs->header->xh_count, -1);
        /* Remove the xattr entry and tree root which has already be set*/
        memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
        memset(val, 0, size);

        ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
        if (ret < 0)
                mlog_errno(ret);
out_commit:
        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
        return ret;
}

static int ocfs2_xattr_update_entry(struct inode *inode,
                                    struct ocfs2_xattr_info *xi,
                                    struct ocfs2_xattr_search *xs,
                                    size_t offs)
{
        handle_t *handle = NULL;
        int ret = 0;

        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
                                   OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                mlog_errno(ret);
                goto out;
        }
        ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        xs->here->xe_name_offset = cpu_to_le16(offs);
        xs->here->xe_value_size = cpu_to_le64(xi->value_len);
        if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
                ocfs2_xattr_set_local(xs->here, 1);
        else
                ocfs2_xattr_set_local(xs->here, 0);
        ocfs2_xattr_hash_entry(inode, xs->header, xs->here);

        ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
        if (ret < 0)
                mlog_errno(ret);
out_commit:
        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
        return ret;
}

/*
 * ocfs2_xattr_set_value_outside()
 *
 * Set large size value in B tree.
 */
static int ocfs2_xattr_set_value_outside(struct inode *inode,
                                         struct ocfs2_xattr_info *xi,
                                         struct ocfs2_xattr_search *xs,
                                         size_t offs)
{
        size_t name_len = strlen(xi->name);
        void *val = xs->base + offs;
        struct ocfs2_xattr_value_root *xv = NULL;
        size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
        int ret = 0;

        memset(val, 0, size);
        memcpy(val, xi->name, name_len);
        xv = (struct ocfs2_xattr_value_root *)
                (val + OCFS2_XATTR_SIZE(name_len));
        xv->xr_clusters = 0;
        xv->xr_last_eb_blk = 0;
        xv->xr_list.l_tree_depth = 0;
        xv->xr_list.l_count = cpu_to_le16(1);
        xv->xr_list.l_next_free_rec = 0;

        ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
                                         xi->value_len);
        if (ret < 0) {
                mlog_errno(ret);
                return ret;
        }
        ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
                                              xi->value_len);
        if (ret < 0) {
                mlog_errno(ret);
                return ret;
        }
        ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
        if (ret < 0)
                mlog_errno(ret);

        return ret;
}

/*
 * ocfs2_xattr_set_entry_local()
 *
 * Set, replace or remove extended attribute in local.
 */
static void ocfs2_xattr_set_entry_local(struct inode *inode,
                                        struct ocfs2_xattr_info *xi,
                                        struct ocfs2_xattr_search *xs,
                                        struct ocfs2_xattr_entry *last,
                                        size_t min_offs)
{
        size_t name_len = strlen(xi->name);
        int i;

        if (xi->value && xs->not_found) {
                /* Insert the new xattr entry. */
                le16_add_cpu(&xs->header->xh_count, 1);
                ocfs2_xattr_set_type(last, xi->name_index);
                ocfs2_xattr_set_local(last, 1);
                last->xe_name_len = name_len;
        } else {
                void *first_val;
                void *val;
                size_t offs, size;

                first_val = xs->base + min_offs;
                offs = le16_to_cpu(xs->here->xe_name_offset);
                val = xs->base + offs;

                if (le64_to_cpu(xs->here->xe_value_size) >
                    OCFS2_XATTR_INLINE_SIZE)
                        size = OCFS2_XATTR_SIZE(name_len) +
                                OCFS2_XATTR_ROOT_SIZE;
                else
                        size = OCFS2_XATTR_SIZE(name_len) +
                        OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));

                if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
                                OCFS2_XATTR_SIZE(xi->value_len)) {
                        /* The old and the new value have the
                           same size. Just replace the value. */
                        ocfs2_xattr_set_local(xs->here, 1);
                        xs->here->xe_value_size = cpu_to_le64(xi->value_len);
                        /* Clear value bytes. */
                        memset(val + OCFS2_XATTR_SIZE(name_len),
                               0,
                               OCFS2_XATTR_SIZE(xi->value_len));
                        memcpy(val + OCFS2_XATTR_SIZE(name_len),
                               xi->value,
                               xi->value_len);
                        return;
                }
                /* Remove the old name+value. */
                memmove(first_val + size, first_val, val - first_val);
                memset(first_val, 0, size);
                xs->here->xe_name_hash = 0;
                xs->here->xe_name_offset = 0;
                ocfs2_xattr_set_local(xs->here, 1);
                xs->here->xe_value_size = 0;

                min_offs += size;

                /* Adjust all value offsets. */
                last = xs->header->xh_entries;
                for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
                        size_t o = le16_to_cpu(last->xe_name_offset);

                        if (o < offs)
                                last->xe_name_offset = cpu_to_le16(o + size);
                        last += 1;
                }

                if (!xi->value) {
                        /* Remove the old entry. */
                        last -= 1;
                        memmove(xs->here, xs->here + 1,
                                (void *)last - (void *)xs->here);
                        memset(last, 0, sizeof(struct ocfs2_xattr_entry));
                        le16_add_cpu(&xs->header->xh_count, -1);
                }
        }
        if (xi->value) {
                /* Insert the new name+value. */
                size_t size = OCFS2_XATTR_SIZE(name_len) +
                                OCFS2_XATTR_SIZE(xi->value_len);
                void *val = xs->base + min_offs - size;

                xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
                memset(val, 0, size);
                memcpy(val, xi->name, name_len);
                memcpy(val + OCFS2_XATTR_SIZE(name_len),
                       xi->value,
                       xi->value_len);
                xs->here->xe_value_size = cpu_to_le64(xi->value_len);
                ocfs2_xattr_set_local(xs->here, 1);
                ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
        }

        return;
}

/*
 * ocfs2_xattr_set_entry()
 *
 * Set extended attribute entry into inode or block.
 *
 * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
 * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
 * then set value in B tree with set_value_outside().
 */
static int ocfs2_xattr_set_entry(struct inode *inode,
                                 struct ocfs2_xattr_info *xi,
                                 struct ocfs2_xattr_search *xs,
                                 int flag)
{
        struct ocfs2_xattr_entry *last;
        struct ocfs2_inode_info *oi = OCFS2_I(inode);
        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
        size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
        size_t size_l = 0;
        handle_t *handle = NULL;
        int free, i, ret;
        struct ocfs2_xattr_info xi_l = {
                .name_index = xi->name_index,
                .name = xi->name,
                .value = xi->value,
                .value_len = xi->value_len,
        };

        /* Compute min_offs, last and free space. */
        last = xs->header->xh_entries;

        for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
                size_t offs = le16_to_cpu(last->xe_name_offset);
                if (offs < min_offs)
                        min_offs = offs;
                last += 1;
        }

        free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
        if (free < 0)
                return -EFAULT;

        if (!xs->not_found) {
                size_t size = 0;
                if (ocfs2_xattr_is_local(xs->here))
                        size = OCFS2_XATTR_SIZE(name_len) +
                        OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
                else
                        size = OCFS2_XATTR_SIZE(name_len) +
                                OCFS2_XATTR_ROOT_SIZE;
                free += (size + sizeof(struct ocfs2_xattr_entry));
        }
        /* Check free space in inode or block */
        if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
                if (free < sizeof(struct ocfs2_xattr_entry) +
                           OCFS2_XATTR_SIZE(name_len) +
                           OCFS2_XATTR_ROOT_SIZE) {
                        ret = -ENOSPC;
                        goto out;
                }
                size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
                xi_l.value = (void *)&def_xv;
                xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
        } else if (xi->value) {
                if (free < sizeof(struct ocfs2_xattr_entry) +
                           OCFS2_XATTR_SIZE(name_len) +
                           OCFS2_XATTR_SIZE(xi->value_len)) {
                        ret = -ENOSPC;
                        goto out;
                }
        }

        if (!xs->not_found) {
                /* For existing extended attribute */
                size_t size = OCFS2_XATTR_SIZE(name_len) +
                        OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
                size_t offs = le16_to_cpu(xs->here->xe_name_offset);
                void *val = xs->base + offs;

                if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
                        /* Replace existing local xattr with tree root */
                        ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
                                                            offs);
                        if (ret < 0)
                                mlog_errno(ret);
                        goto out;
                } else if (!ocfs2_xattr_is_local(xs->here)) {
                        /* For existing xattr which has value outside */
                        struct ocfs2_xattr_value_root *xv = NULL;
                        xv = (struct ocfs2_xattr_value_root *)(val +
                                OCFS2_XATTR_SIZE(name_len));

                        if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
                                /*
                                 * If new value need set outside also,
                                 * first truncate old value to new value,
                                 * then set new value with set_value_outside().
                                 */
                                ret = ocfs2_xattr_value_truncate(inode,
                                                                 xs->xattr_bh,
                                                                 xv,
                                                                 xi->value_len);
                                if (ret < 0) {
                                        mlog_errno(ret);
                                        goto out;
                                }

                                ret = __ocfs2_xattr_set_value_outside(inode,
                                                                xv,
                                                                xi->value,
                                                                xi->value_len);
                                if (ret < 0) {
                                        mlog_errno(ret);
                                        goto out;
                                }

                                ret = ocfs2_xattr_update_entry(inode,
                                                               xi,
                                                               xs,
                                                               offs);
                                if (ret < 0)
                                        mlog_errno(ret);
                                goto out;
                        } else {
                                /*
                                 * If new value need set in local,
                                 * just trucate old value to zero.
                                 */
                                 ret = ocfs2_xattr_value_truncate(inode,
                                                                 xs->xattr_bh,
                                                                 xv,
                                                                 0);
                                if (ret < 0)
                                        mlog_errno(ret);
                        }
                }
        }

        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
                                   OCFS2_INODE_UPDATE_CREDITS);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        if (!(flag & OCFS2_INLINE_XATTR_FL)) {
                /* set extended attribute in external block. */
                ret = ocfs2_extend_trans(handle,
                                         OCFS2_INODE_UPDATE_CREDITS +
                                         OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
                if (ret) {
                        mlog_errno(ret);
                        goto out_commit;
                }
                ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
                                           OCFS2_JOURNAL_ACCESS_WRITE);
                if (ret) {
                        mlog_errno(ret);
                        goto out_commit;
                }
        }

        /*
         * Set value in local, include set tree root in local.
         * This is the first step for value size >INLINE_SIZE.
         */
        ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);

        if (!(flag & OCFS2_INLINE_XATTR_FL)) {
                ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out_commit;
                }
        }

        if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
            (flag & OCFS2_INLINE_XATTR_FL)) {
                struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
                unsigned int xattrsize = osb->s_xattr_inline_size;

                /*
                 * Adjust extent record count or inline data size
                 * to reserve space for extended attribute.
                 */
                if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
                        struct ocfs2_inline_data *idata = &di->id2.i_data;
                        le16_add_cpu(&idata->id_count, -xattrsize);
                } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
                        struct ocfs2_extent_list *el = &di->id2.i_list;
                        le16_add_cpu(&el->l_count, -(xattrsize /
                                        sizeof(struct ocfs2_extent_rec)));
                }
                di->i_xattr_inline_size = cpu_to_le16(xattrsize);
        }
        /* Update xattr flag */
        spin_lock(&oi->ip_lock);
        oi->ip_dyn_features |= flag;
        di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
        spin_unlock(&oi->ip_lock);
        /* Update inode ctime */
        inode->i_ctime = CURRENT_TIME;
        di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
        di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);

        ret = ocfs2_journal_dirty(handle, xs->inode_bh);
        if (ret < 0)
                mlog_errno(ret);

out_commit:
        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);

        if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
                /*
                 * Set value outside in B tree.
                 * This is the second step for value size > INLINE_SIZE.
                 */
                size_t offs = le16_to_cpu(xs->here->xe_name_offset);
                ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
                if (ret < 0) {
                        int ret2;

                        mlog_errno(ret);
                        /*
                         * If set value outside failed, we have to clean
                         * the junk tree root we have already set in local.
                         */
                        ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
                        if (ret2 < 0)
                                mlog_errno(ret2);
                }
        }
out:
        return ret;

}

static int ocfs2_remove_value_outside(struct inode*inode,
                                      struct buffer_head *bh,
                                      struct ocfs2_xattr_header *header)
{
        int ret = 0, i;

        for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
                struct ocfs2_xattr_entry *entry = &header->xh_entries[i];

                if (!ocfs2_xattr_is_local(entry)) {
                        struct ocfs2_xattr_value_root *xv;
                        void *val;

                        val = (void *)header +
                                le16_to_cpu(entry->xe_name_offset);
                        xv = (struct ocfs2_xattr_value_root *)
                                (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
                        ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
                        if (ret < 0) {
                                mlog_errno(ret);
                                return ret;
                        }
                }
        }

        return ret;
}

static int ocfs2_xattr_ibody_remove(struct inode *inode,
                                    struct buffer_head *di_bh)
{

        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
        struct ocfs2_xattr_header *header;
        int ret;

        header = (struct ocfs2_xattr_header *)
                 ((void *)di + inode->i_sb->s_blocksize -
                 le16_to_cpu(di->i_xattr_inline_size));

        ret = ocfs2_remove_value_outside(inode, di_bh, header);

        return ret;
}

static int ocfs2_xattr_block_remove(struct inode *inode,
                                    struct buffer_head *blk_bh)
{
        struct ocfs2_xattr_block *xb;
        int ret = 0;

        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
                struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
                ret = ocfs2_remove_value_outside(inode, blk_bh, header);
        } else
                ret = ocfs2_delete_xattr_index_block(inode, blk_bh);

        return ret;
}

static int ocfs2_xattr_free_block(struct inode *inode,
                                  u64 block)
{
        struct inode *xb_alloc_inode;
        struct buffer_head *xb_alloc_bh = NULL;
        struct buffer_head *blk_bh = NULL;
        struct ocfs2_xattr_block *xb;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        handle_t *handle;
        int ret = 0;
        u64 blk, bg_blkno;
        u16 bit;

        ret = ocfs2_read_block(inode, block, &blk_bh);
        if (ret < 0) {
                mlog_errno(ret);
                goto out;
        }

        /*Verify the signature of xattr block*/
        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
                ret = -EFAULT;
                goto out;
        }

        ret = ocfs2_xattr_block_remove(inode, blk_bh);
        if (ret < 0) {
                mlog_errno(ret);
                goto out;
        }

        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
        blk = le64_to_cpu(xb->xb_blkno);
        bit = le16_to_cpu(xb->xb_suballoc_bit);
        bg_blkno = ocfs2_which_suballoc_group(blk, bit);

        xb_alloc_inode = ocfs2_get_system_file_inode(osb,
                                EXTENT_ALLOC_SYSTEM_INODE,
                                le16_to_cpu(xb->xb_suballoc_slot));
        if (!xb_alloc_inode) {
                ret = -ENOMEM;
                mlog_errno(ret);
                goto out;
        }
        mutex_lock(&xb_alloc_inode->i_mutex);

        ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
        if (ret < 0) {
                mlog_errno(ret);
                goto out_mutex;
        }

        handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                mlog_errno(ret);
                goto out_unlock;
        }

        ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
                                       bit, bg_blkno, 1);
        if (ret < 0)
                mlog_errno(ret);

        ocfs2_commit_trans(osb, handle);
out_unlock:
        ocfs2_inode_unlock(xb_alloc_inode, 1);
        brelse(xb_alloc_bh);
out_mutex:
        mutex_unlock(&xb_alloc_inode->i_mutex);
        iput(xb_alloc_inode);
out:
        brelse(blk_bh);
        return ret;
}

/*
 * ocfs2_xattr_remove()
 *
 * Free extended attribute resources associated with this inode.
 */
int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
{
        struct ocfs2_inode_info *oi = OCFS2_I(inode);
        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
        handle_t *handle;
        int ret;

        if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
                return 0;

        if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
                return 0;

        if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
                ret = ocfs2_xattr_ibody_remove(inode, di_bh);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out;
                }
        }

        if (di->i_xattr_loc) {
                ret = ocfs2_xattr_free_block(inode,
                                             le64_to_cpu(di->i_xattr_loc));
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out;
                }
        }

        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
                                   OCFS2_INODE_UPDATE_CREDITS);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                mlog_errno(ret);
                goto out;
        }
        ret = ocfs2_journal_access(handle, inode, di_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        di->i_xattr_loc = 0;

        spin_lock(&oi->ip_lock);
        oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
        di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
        spin_unlock(&oi->ip_lock);

        ret = ocfs2_journal_dirty(handle, di_bh);
        if (ret < 0)
                mlog_errno(ret);
out_commit:
        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
        return ret;
}

static int ocfs2_xattr_has_space_inline(struct inode *inode,
                                        struct ocfs2_dinode *di)
{
        struct ocfs2_inode_info *oi = OCFS2_I(inode);
        unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
        int free;

        if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
                return 0;

        if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
                struct ocfs2_inline_data *idata = &di->id2.i_data;
                free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
        } else if (ocfs2_inode_is_fast_symlink(inode)) {
                free = ocfs2_fast_symlink_chars(inode->i_sb) -
                        le64_to_cpu(di->i_size);
        } else {
                struct ocfs2_extent_list *el = &di->id2.i_list;
                free = (le16_to_cpu(el->l_count) -
                        le16_to_cpu(el->l_next_free_rec)) *
                        sizeof(struct ocfs2_extent_rec);
        }
        if (free >= xattrsize)
                return 1;

        return 0;
}

/*
 * ocfs2_xattr_ibody_find()
 *
 * Find extended attribute in inode block and
 * fill search info into struct ocfs2_xattr_search.
 */
static int ocfs2_xattr_ibody_find(struct inode *inode,
                                  int name_index,
                                  const char *name,
                                  struct ocfs2_xattr_search *xs)
{
        struct ocfs2_inode_info *oi = OCFS2_I(inode);
        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
        int ret;
        int has_space = 0;

        if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
                return 0;

        if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
                down_read(&oi->ip_alloc_sem);
                has_space = ocfs2_xattr_has_space_inline(inode, di);
                up_read(&oi->ip_alloc_sem);
                if (!has_space)
                        return 0;
        }

        xs->xattr_bh = xs->inode_bh;
        xs->end = (void *)di + inode->i_sb->s_blocksize;
        if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
                xs->header = (struct ocfs2_xattr_header *)
                        (xs->end - le16_to_cpu(di->i_xattr_inline_size));
        else
                xs->header = (struct ocfs2_xattr_header *)
                        (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
        xs->base = (void *)xs->header;
        xs->here = xs->header->xh_entries;

        /* Find the named attribute. */
        if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
                ret = ocfs2_xattr_find_entry(name_index, name, xs);
                if (ret && ret != -ENODATA)
                        return ret;
                xs->not_found = ret;
        }

        return 0;
}

/*
 * ocfs2_xattr_ibody_set()
 *
 * Set, replace or remove an extended attribute into inode block.
 *
 */
static int ocfs2_xattr_ibody_set(struct inode *inode,
                                 struct ocfs2_xattr_info *xi,
                                 struct ocfs2_xattr_search *xs)
{
        struct ocfs2_inode_info *oi = OCFS2_I(inode);
        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
        int ret;

        if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
                return -ENOSPC;

        down_write(&oi->ip_alloc_sem);
        if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
                if (!ocfs2_xattr_has_space_inline(inode, di)) {
                        ret = -ENOSPC;
                        goto out;
                }
        }

        ret = ocfs2_xattr_set_entry(inode, xi, xs,
                                (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
out:
        up_write(&oi->ip_alloc_sem);

        return ret;
}

/*
 * ocfs2_xattr_block_find()
 *
 * Find extended attribute in external block and
 * fill search info into struct ocfs2_xattr_search.
 */
static int ocfs2_xattr_block_find(struct inode *inode,
                                  int name_index,
                                  const char *name,
                                  struct ocfs2_xattr_search *xs)
{
        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
        struct buffer_head *blk_bh = NULL;
        struct ocfs2_xattr_block *xb;
        int ret = 0;

        if (!di->i_xattr_loc)
                return ret;

        ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
        if (ret < 0) {
                mlog_errno(ret);
                return ret;
        }
        /*Verify the signature of xattr block*/
        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
                        ret = -EFAULT;
                        goto cleanup;
        }

        xs->xattr_bh = blk_bh;
        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;

        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
                xs->header = &xb->xb_attrs.xb_header;
                xs->base = (void *)xs->header;
                xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
                xs->here = xs->header->xh_entries;

                ret = ocfs2_xattr_find_entry(name_index, name, xs);
        } else
                ret = ocfs2_xattr_index_block_find(inode, blk_bh,
                                                   name_index,
                                                   name, xs);

        if (ret && ret != -ENODATA) {
                xs->xattr_bh = NULL;
                goto cleanup;
        }
        xs->not_found = ret;
        return 0;
cleanup:
        brelse(blk_bh);

        return ret;
}

/*
 * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
 * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
 * re-initialized.
 */
static int ocfs2_restore_xattr_block(struct inode *inode,
                                     struct ocfs2_xattr_search *xs)
{
        int ret;
        handle_t *handle;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        struct ocfs2_xattr_block *xb =
                (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
        struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
        u16 xb_flags = le16_to_cpu(xb->xb_flags);

        BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
                le16_to_cpu(el->l_next_free_rec) != 0);

        handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                handle = NULL;
                goto out;
        }

        ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret < 0) {
                mlog_errno(ret);
                goto out_commit;
        }

        memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
               offsetof(struct ocfs2_xattr_block, xb_attrs));

        xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);

        ocfs2_journal_dirty(handle, xs->xattr_bh);

out_commit:
        ocfs2_commit_trans(osb, handle);
out:
        return ret;
}

/*
 * ocfs2_xattr_block_set()
 *
 * Set, replace or remove an extended attribute into external block.
 *
 */
static int ocfs2_xattr_block_set(struct inode *inode,
                                 struct ocfs2_xattr_info *xi,
                                 struct ocfs2_xattr_search *xs)
{
        struct buffer_head *new_bh = NULL;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        struct ocfs2_dinode *di =  (struct ocfs2_dinode *)xs->inode_bh->b_data;
        struct ocfs2_alloc_context *meta_ac = NULL;
        handle_t *handle = NULL;
        struct ocfs2_xattr_block *xblk = NULL;
        u16 suballoc_bit_start;
        u32 num_got;
        u64 first_blkno;
        int ret;

        if (!xs->xattr_bh) {
                /*
                 * Alloc one external block for extended attribute
                 * outside of inode.
                 */
                ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out;
                }
                handle = ocfs2_start_trans(osb,
                                           OCFS2_XATTR_BLOCK_CREATE_CREDITS);
                if (IS_ERR(handle)) {
                        ret = PTR_ERR(handle);
                        mlog_errno(ret);
                        goto out;
                }
                ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
                                           OCFS2_JOURNAL_ACCESS_CREATE);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out_commit;
                }

                ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
                                           &suballoc_bit_start, &num_got,
                                           &first_blkno);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out_commit;
                }

                new_bh = sb_getblk(inode->i_sb, first_blkno);
                ocfs2_set_new_buffer_uptodate(inode, new_bh);

                ret = ocfs2_journal_access(handle, inode, new_bh,
                                           OCFS2_JOURNAL_ACCESS_CREATE);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out_commit;
                }

                /* Initialize ocfs2_xattr_block */
                xs->xattr_bh = new_bh;
                xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
                memset(xblk, 0, inode->i_sb->s_blocksize);
                strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
                xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
                xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
                xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
                xblk->xb_blkno = cpu_to_le64(first_blkno);

                xs->header = &xblk->xb_attrs.xb_header;
                xs->base = (void *)xs->header;
                xs->end = (void *)xblk + inode->i_sb->s_blocksize;
                xs->here = xs->header->xh_entries;


                ret = ocfs2_journal_dirty(handle, new_bh);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out_commit;
                }
                di->i_xattr_loc = cpu_to_le64(first_blkno);
                ret = ocfs2_journal_dirty(handle, xs->inode_bh);
                if (ret < 0)
                        mlog_errno(ret);
out_commit:
                ocfs2_commit_trans(osb, handle);
out:
                if (meta_ac)
                        ocfs2_free_alloc_context(meta_ac);
                if (ret < 0)
                        return ret;
        } else
                xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;

        if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
                /* Set extended attribute into external block */
                ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
                if (!ret || ret != -ENOSPC)
                        goto end;

                ret = ocfs2_xattr_create_index_block(inode, xs);
                if (ret)
                        goto end;
        }

        ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
        if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
                ret = ocfs2_restore_xattr_block(inode, xs);

end:

        return ret;
}

/*
 * ocfs2_xattr_set()
 *
 * Set, replace or remove an extended attribute for this inode.
 * value is NULL to remove an existing extended attribute, else either
 * create or replace an extended attribute.
 */
int ocfs2_xattr_set(struct inode *inode,
                    int name_index,
                    const char *name,
                    const void *value,
                    size_t value_len,
                    int flags)
{
        struct buffer_head *di_bh = NULL;
        struct ocfs2_dinode *di;
        int ret;
        u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);

        struct ocfs2_xattr_info xi = {
                .name_index = name_index,
                .name = name,
                .value = value,
                .value_len = value_len,
        };

        struct ocfs2_xattr_search xis = {
                .not_found = -ENODATA,
        };

        struct ocfs2_xattr_search xbs = {
                .not_found = -ENODATA,
        };

        if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
                return -EOPNOTSUPP;

        ret = ocfs2_inode_lock(inode, &di_bh, 1);
        if (ret < 0) {
                mlog_errno(ret);
                return ret;
        }
        xis.inode_bh = xbs.inode_bh = di_bh;
        di = (struct ocfs2_dinode *)di_bh->b_data;

        down_write(&OCFS2_I(inode)->ip_xattr_sem);
        /*
         * Scan inode and external block to find the same name
         * extended attribute and collect search infomation.
         */
        ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
        if (ret)
                goto cleanup;
        if (xis.not_found) {
                ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
                if (ret)
                        goto cleanup;
        }

        if (xis.not_found && xbs.not_found) {
                ret = -ENODATA;
                if (flags & XATTR_REPLACE)
                        goto cleanup;
                ret = 0;
                if (!value)
                        goto cleanup;
        } else {
                ret = -EEXIST;
                if (flags & XATTR_CREATE)
                        goto cleanup;
        }

        if (!value) {
                /* Remove existing extended attribute */
                if (!xis.not_found)
                        ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
                else if (!xbs.not_found)
                        ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
        } else {
                /* We always try to set extended attribute into inode first*/
                ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
                if (!ret && !xbs.not_found) {
                        /*
                         * If succeed and that extended attribute existing in
                         * external block, then we will remove it.
                         */
                        xi.value = NULL;
                        xi.value_len = 0;
                        ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
                } else if (ret == -ENOSPC) {
                        if (di->i_xattr_loc && !xbs.xattr_bh) {
                                ret = ocfs2_xattr_block_find(inode, name_index,
                                                             name, &xbs);
                                if (ret)
                                        goto cleanup;
                        }
                        /*
                         * If no space in inode, we will set extended attribute
                         * into external block.
                         */
                        ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
                        if (ret)
                                goto cleanup;
                        if (!xis.not_found) {
                                /*
                                 * If succeed and that extended attribute
                                 * existing in inode, we will remove it.
                                 */
                                xi.value = NULL;
                                xi.value_len = 0;
                                ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
                        }
                }
        }
cleanup:
        up_write(&OCFS2_I(inode)->ip_xattr_sem);
        ocfs2_inode_unlock(inode, 1);
        brelse(di_bh);
        brelse(xbs.xattr_bh);
        for (i = 0; i < blk_per_bucket; i++)
                brelse(xbs.bucket.bhs[i]);

        return ret;
}

/*
 * Find the xattr extent rec which may contains name_hash.
 * e_cpos will be the first name hash of the xattr rec.
 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
 */
static int ocfs2_xattr_get_rec(struct inode *inode,
                               u32 name_hash,
                               u64 *p_blkno,
                               u32 *e_cpos,
                               u32 *num_clusters,
                               struct ocfs2_extent_list *el)
{
        int ret = 0, i;
        struct buffer_head *eb_bh = NULL;
        struct ocfs2_extent_block *eb;
        struct ocfs2_extent_rec *rec = NULL;
        u64 e_blkno = 0;

        if (el->l_tree_depth) {
                ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                eb = (struct ocfs2_extent_block *) eb_bh->b_data;
                el = &eb->h_list;

                if (el->l_tree_depth) {
                        ocfs2_error(inode->i_sb,
                                    "Inode %lu has non zero tree depth in "
                                    "xattr tree block %llu\n", inode->i_ino,
                                    (unsigned long long)eb_bh->b_blocknr);
                        ret = -EROFS;
                        goto out;
                }
        }

        for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
                rec = &el->l_recs[i];

                if (le32_to_cpu(rec->e_cpos) <= name_hash) {
                        e_blkno = le64_to_cpu(rec->e_blkno);
                        break;
                }
        }

        if (!e_blkno) {
                ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
                            "record (%u, %u, 0) in xattr", inode->i_ino,
                            le32_to_cpu(rec->e_cpos),
                            ocfs2_rec_clusters(el, rec));
                ret = -EROFS;
                goto out;
        }

        *p_blkno = le64_to_cpu(rec->e_blkno);
        *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
        if (e_cpos)
                *e_cpos = le32_to_cpu(rec->e_cpos);
out:
        brelse(eb_bh);
        return ret;
}

typedef int (xattr_bucket_func)(struct inode *inode,
                                struct ocfs2_xattr_bucket *bucket,
                                void *para);

static int ocfs2_find_xe_in_bucket(struct inode *inode,
                                   struct buffer_head *header_bh,
                                   int name_index,
                                   const char *name,
                                   u32 name_hash,
                                   u16 *xe_index,
                                   int *found)
{
        int i, ret = 0, cmp = 1, block_off, new_offset;
        struct ocfs2_xattr_header *xh =
                        (struct ocfs2_xattr_header *)header_bh->b_data;
        size_t name_len = strlen(name);
        struct ocfs2_xattr_entry *xe = NULL;
        struct buffer_head *name_bh = NULL;
        char *xe_name;

        /*
         * We don't use binary search in the bucket because there
         * may be multiple entries with the same name hash.
         */
        for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
                xe = &xh->xh_entries[i];

                if (name_hash > le32_to_cpu(xe->xe_name_hash))
                        continue;
                else if (name_hash < le32_to_cpu(xe->xe_name_hash))
                        break;

                cmp = name_index - ocfs2_xattr_get_type(xe);
                if (!cmp)
                        cmp = name_len - xe->xe_name_len;
                if (cmp)
                        continue;

                ret = ocfs2_xattr_bucket_get_name_value(inode,
                                                        xh,
                                                        i,
                                                        &block_off,
                                                        &new_offset);
                if (ret) {
                        mlog_errno(ret);
                        break;
                }

                ret = ocfs2_read_block(inode, header_bh->b_blocknr + block_off,
                                       &name_bh);
                if (ret) {
                        mlog_errno(ret);
                        break;
                }
                xe_name = name_bh->b_data + new_offset;

                cmp = memcmp(name, xe_name, name_len);
                brelse(name_bh);
                name_bh = NULL;

                if (cmp == 0) {
                        *xe_index = i;
                        *found = 1;
                        ret = 0;
                        break;
                }
        }

        return ret;
}

/*
 * Find the specified xattr entry in a series of buckets.
 * This series start from p_blkno and last for num_clusters.
 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
 * the num of the valid buckets.
 *
 * Return the buffer_head this xattr should reside in. And if the xattr's
 * hash is in the gap of 2 buckets, return the lower bucket.
 */
static int ocfs2_xattr_bucket_find(struct inode *inode,
                                   int name_index,
                                   const char *name,
                                   u32 name_hash,
                                   u64 p_blkno,
                                   u32 first_hash,
                                   u32 num_clusters,
                                   struct ocfs2_xattr_search *xs)
{
        int ret, found = 0;
        struct buffer_head *bh = NULL;
        struct buffer_head *lower_bh = NULL;
        struct ocfs2_xattr_header *xh = NULL;
        struct ocfs2_xattr_entry *xe = NULL;
        u16 index = 0;
        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
        int low_bucket = 0, bucket, high_bucket;
        u32 last_hash;
        u64 blkno;

        ret = ocfs2_read_block(inode, p_blkno, &bh);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        xh = (struct ocfs2_xattr_header *)bh->b_data;
        high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;

        while (low_bucket <= high_bucket) {
                brelse(bh);
                bh = NULL;
                bucket = (low_bucket + high_bucket) / 2;

                blkno = p_blkno + bucket * blk_per_bucket;

                ret = ocfs2_read_block(inode, blkno, &bh);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                xh = (struct ocfs2_xattr_header *)bh->b_data;
                xe = &xh->xh_entries[0];
                if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
                        high_bucket = bucket - 1;
                        continue;
                }

                /*
                 * Check whether the hash of the last entry in our
                 * bucket is larger than the search one. for an empty
                 * bucket, the last one is also the first one.
                 */
                if (xh->xh_count)
                        xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];

                last_hash = le32_to_cpu(xe->xe_name_hash);

                /* record lower_bh which may be the insert place. */
                brelse(lower_bh);
                lower_bh = bh;
                bh = NULL;

                if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
                        low_bucket = bucket + 1;
                        continue;
                }

                /* the searched xattr should reside in this bucket if exists. */
                ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
                                              name_index, name, name_hash,
                                              &index, &found);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }
                break;
        }

        /*
         * Record the bucket we have found.
         * When the xattr's hash value is in the gap of 2 buckets, we will
         * always set it to the previous bucket.
         */
        if (!lower_bh) {
                /*
                 * We can't find any bucket whose first name_hash is less
                 * than the find name_hash.
                 */
                BUG_ON(bh->b_blocknr != p_blkno);
                lower_bh = bh;
                bh = NULL;
        }
        xs->bucket.bhs[0] = lower_bh;
        xs->bucket.xh = (struct ocfs2_xattr_header *)
                                        xs->bucket.bhs[0]->b_data;
        lower_bh = NULL;

        xs->header = xs->bucket.xh;
        xs->base = xs->bucket.bhs[0]->b_data;
        xs->end = xs->base + inode->i_sb->s_blocksize;

        if (found) {
                /*
                 * If we have found the xattr enty, read all the blocks in
                 * this bucket.
                 */
                ret = ocfs2_read_blocks(inode, xs->bucket.bhs[0]->b_blocknr + 1,
                                        blk_per_bucket - 1, &xs->bucket.bhs[1],
                                        0);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                xs->here = &xs->header->xh_entries[index];
                mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
                     (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
        } else
                ret = -ENODATA;

out:
        brelse(bh);
        brelse(lower_bh);
        return ret;
}

static int ocfs2_xattr_index_block_find(struct inode *inode,
                                        struct buffer_head *root_bh,
                                        int name_index,
                                        const char *name,
                                        struct ocfs2_xattr_search *xs)
{
        int ret;
        struct ocfs2_xattr_block *xb =
                        (struct ocfs2_xattr_block *)root_bh->b_data;
        struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
        struct ocfs2_extent_list *el = &xb_root->xt_list;
        u64 p_blkno = 0;
        u32 first_hash, num_clusters = 0;
        u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));

        if (le16_to_cpu(el->l_next_free_rec) == 0)
                return -ENODATA;

        mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
             name, name_hash, name_index);

        ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
                                  &num_clusters, el);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);

        mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
             "in the rec is %u\n", num_clusters, p_blkno, first_hash);

        ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
                                      p_blkno, first_hash, num_clusters, xs);

out:
        return ret;
}

static int ocfs2_iterate_xattr_buckets(struct inode *inode,
                                       u64 blkno,
                                       u32 clusters,
                                       xattr_bucket_func *func,
                                       void *para)
{
        int i, j, ret = 0;
        int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
        u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
        u32 num_buckets = clusters * bpc;
        struct ocfs2_xattr_bucket bucket;

        memset(&bucket, 0, sizeof(bucket));

        mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
             clusters, blkno);

        for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
                ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket,
                                        bucket.bhs, 0);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
                /*
                 * The real bucket num in this series of blocks is stored
                 * in the 1st bucket.
                 */
                if (i == 0)
                        num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);

                mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno,
                     le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash));
                if (func) {
                        ret = func(inode, &bucket, para);
                        if (ret) {
                                mlog_errno(ret);
                                break;
                        }
                }

                for (j = 0; j < blk_per_bucket; j++)
                        brelse(bucket.bhs[j]);
                memset(&bucket, 0, sizeof(bucket));
        }

out:
        for (j = 0; j < blk_per_bucket; j++)
                brelse(bucket.bhs[j]);

        return ret;
}

struct ocfs2_xattr_tree_list {
        char *buffer;
        size_t buffer_size;
        size_t result;
};

static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
                                             struct ocfs2_xattr_header *xh,
                                             int index,
                                             int *block_off,
                                             int *new_offset)
{
        u16 name_offset;

        if (index < 0 || index >= le16_to_cpu(xh->xh_count))
                return -EINVAL;

        name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);

        *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
        *new_offset = name_offset % inode->i_sb->s_blocksize;

        return 0;
}

static int ocfs2_list_xattr_bucket(struct inode *inode,
                                   struct ocfs2_xattr_bucket *bucket,
                                   void *para)
{
        int ret = 0, type;
        struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
        int i, block_off, new_offset;
        const char *prefix, *name;

        for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
                struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
                type = ocfs2_xattr_get_type(entry);
                prefix = ocfs2_xattr_prefix(type);

                if (prefix) {
                        ret = ocfs2_xattr_bucket_get_name_value(inode,
                                                                bucket->xh,
                                                                i,
                                                                &block_off,
                                                                &new_offset);
                        if (ret)
                                break;

                        name = (const char *)bucket->bhs[block_off]->b_data +
                                new_offset;
                        ret = ocfs2_xattr_list_entry(xl->buffer,
                                                     xl->buffer_size,
                                                     &xl->result,
                                                     prefix, name,
                                                     entry->xe_name_len);
                        if (ret)
                                break;
                }
        }

        return ret;
}

static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
                                             struct ocfs2_xattr_tree_root *xt,
                                             char *buffer,
                                             size_t buffer_size)
{
        struct ocfs2_extent_list *el = &xt->xt_list;
        int ret = 0;
        u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
        u64 p_blkno = 0;
        struct ocfs2_xattr_tree_list xl = {
                .buffer = buffer,
                .buffer_size = buffer_size,
                .result = 0,
        };

        if (le16_to_cpu(el->l_next_free_rec) == 0)
                return 0;

        while (name_hash > 0) {
                ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
                                          &e_cpos, &num_clusters, el);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
                                                  ocfs2_list_xattr_bucket,
                                                  &xl);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                if (e_cpos == 0)
                        break;

                name_hash = e_cpos - 1;
        }

        ret = xl.result;
out:
        return ret;
}

static int cmp_xe(const void *a, const void *b)
{
        const struct ocfs2_xattr_entry *l = a, *r = b;
        u32 l_hash = le32_to_cpu(l->xe_name_hash);
        u32 r_hash = le32_to_cpu(r->xe_name_hash);

        if (l_hash > r_hash)
                return 1;
        if (l_hash < r_hash)
                return -1;
        return 0;
}

static void swap_xe(void *a, void *b, int size)
{
        struct ocfs2_xattr_entry *l = a, *r = b, tmp;

        tmp = *l;
        memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
        memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
}

/*
 * When the ocfs2_xattr_block is filled up, new bucket will be created
 * and all the xattr entries will be moved to the new bucket.
 * Note: we need to sort the entries since they are not saved in order
 * in the ocfs2_xattr_block.
 */
static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
                                           struct buffer_head *xb_bh,
                                           struct buffer_head *xh_bh,
                                           struct buffer_head *data_bh)
{
        int i, blocksize = inode->i_sb->s_blocksize;
        u16 offset, size, off_change;
        struct ocfs2_xattr_entry *xe;
        struct ocfs2_xattr_block *xb =
                                (struct ocfs2_xattr_block *)xb_bh->b_data;
        struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
        struct ocfs2_xattr_header *xh =
                                (struct ocfs2_xattr_header *)xh_bh->b_data;
        u16 count = le16_to_cpu(xb_xh->xh_count);
        char *target = xh_bh->b_data, *src = xb_bh->b_data;

        mlog(0, "cp xattr from block %llu to bucket %llu\n",
             (unsigned long long)xb_bh->b_blocknr,
             (unsigned long long)xh_bh->b_blocknr);

        memset(xh_bh->b_data, 0, blocksize);
        if (data_bh)
                memset(data_bh->b_data, 0, blocksize);
        /*
         * Since the xe_name_offset is based on ocfs2_xattr_header,
         * there is a offset change corresponding to the change of
         * ocfs2_xattr_header's position.
         */
        off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
        xe = &xb_xh->xh_entries[count - 1];
        offset = le16_to_cpu(xe->xe_name_offset) + off_change;
        size = blocksize - offset;

        /* copy all the names and values. */
        if (data_bh)
                target = data_bh->b_data;
        memcpy(target + offset, src + offset, size);

        /* Init new header now. */
        xh->xh_count = xb_xh->xh_count;
        xh->xh_num_buckets = cpu_to_le16(1);
        xh->xh_name_value_len = cpu_to_le16(size);
        xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);

        /* copy all the entries. */
        target = xh_bh->b_data;
        offset = offsetof(struct ocfs2_xattr_header, xh_entries);
        size = count * sizeof(struct ocfs2_xattr_entry);
        memcpy(target + offset, (char *)xb_xh + offset, size);

        /* Change the xe offset for all the xe because of the move. */
        off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
                 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
        for (i = 0; i < count; i++)
                le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);

        mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
             offset, size, off_change);

        sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
             cmp_xe, swap_xe);
}

/*
 * After we move xattr from block to index btree, we have to
 * update ocfs2_xattr_search to the new xe and base.
 *
 * When the entry is in xattr block, xattr_bh indicates the storage place.
 * While if the entry is in index b-tree, "bucket" indicates the
 * real place of the xattr.
 */
static int ocfs2_xattr_update_xattr_search(struct inode *inode,
                                           struct ocfs2_xattr_search *xs,
                                           struct buffer_head *old_bh,
                                           struct buffer_head *new_bh)
{
        int ret = 0;
        char *buf = old_bh->b_data;
        struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
        struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
        int i, blocksize = inode->i_sb->s_blocksize;
        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);

        xs->bucket.bhs[0] = new_bh;
        get_bh(new_bh);
        xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
        xs->header = xs->bucket.xh;

        xs->base = new_bh->b_data;
        xs->end = xs->base + inode->i_sb->s_blocksize;

        if (!xs->not_found) {
                if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
                        ret = ocfs2_read_blocks(inode,
                                        xs->bucket.bhs[0]->b_blocknr + 1,
                                        blk_per_bucket - 1, &xs->bucket.bhs[1],
                                        0);
                        if (ret) {
                                mlog_errno(ret);
                                return ret;
                        }

                        i = xs->here - old_xh->xh_entries;
                        xs->here = &xs->header->xh_entries[i];
                }
        }

        return ret;
}

static int ocfs2_xattr_create_index_block(struct inode *inode,
                                          struct ocfs2_xattr_search *xs)
{
        int ret, credits = OCFS2_SUBALLOC_ALLOC;
        u32 bit_off, len;
        u64 blkno;
        handle_t *handle;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        struct ocfs2_inode_info *oi = OCFS2_I(inode);
        struct ocfs2_alloc_context *data_ac;
        struct buffer_head *xh_bh = NULL, *data_bh = NULL;
        struct buffer_head *xb_bh = xs->xattr_bh;
        struct ocfs2_xattr_block *xb =
                        (struct ocfs2_xattr_block *)xb_bh->b_data;
        struct ocfs2_xattr_tree_root *xr;
        u16 xb_flags = le16_to_cpu(xb->xb_flags);
        u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);

        mlog(0, "create xattr index block for %llu\n",
             (unsigned long long)xb_bh->b_blocknr);

        BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);

        ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        /*
         * XXX:
         * We can use this lock for now, and maybe move to a dedicated mutex
         * if performance becomes a problem later.
         */
        down_write(&oi->ip_alloc_sem);

        /*
         * 3 more credits, one for xattr block update, one for the 1st block
         * of the new xattr bucket and one for the value/data.
         */
        credits += 3;
        handle = ocfs2_start_trans(osb, credits);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                mlog_errno(ret);
                goto out_sem;
        }

        ret = ocfs2_journal_access(handle, inode, xb_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        /*
         * The bucket may spread in many blocks, and
         * we will only touch the 1st block and the last block
         * in the whole bucket(one for entry and one for data).
         */
        blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);

        mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);

        xh_bh = sb_getblk(inode->i_sb, blkno);
        if (!xh_bh) {
                ret = -EIO;
                mlog_errno(ret);
                goto out_commit;
        }

        ocfs2_set_new_buffer_uptodate(inode, xh_bh);

        ret = ocfs2_journal_access(handle, inode, xh_bh,
                                   OCFS2_JOURNAL_ACCESS_CREATE);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        if (bpb > 1) {
                data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
                if (!data_bh) {
                        ret = -EIO;
                        mlog_errno(ret);
                        goto out_commit;
                }

                ocfs2_set_new_buffer_uptodate(inode, data_bh);

                ret = ocfs2_journal_access(handle, inode, data_bh,
                                           OCFS2_JOURNAL_ACCESS_CREATE);
                if (ret) {
                        mlog_errno(ret);
                        goto out_commit;
                }
        }

        ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);

        ocfs2_journal_dirty(handle, xh_bh);
        if (data_bh)
                ocfs2_journal_dirty(handle, data_bh);

        ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);

        /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
        memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
               offsetof(struct ocfs2_xattr_block, xb_attrs));

        xr = &xb->xb_attrs.xb_root;
        xr->xt_clusters = cpu_to_le32(1);
        xr->xt_last_eb_blk = 0;
        xr->xt_list.l_tree_depth = 0;
        xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
        xr->xt_list.l_next_free_rec = cpu_to_le16(1);

        xr->xt_list.l_recs[0].e_cpos = 0;
        xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
        xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);

        xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);

        ret = ocfs2_journal_dirty(handle, xb_bh);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

out_commit:
        ocfs2_commit_trans(osb, handle);

out_sem:
        up_write(&oi->ip_alloc_sem);

out:
        if (data_ac)
                ocfs2_free_alloc_context(data_ac);

        brelse(xh_bh);
        brelse(data_bh);

        return ret;
}

static int cmp_xe_offset(const void *a, const void *b)
{
        const struct ocfs2_xattr_entry *l = a, *r = b;
        u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
        u32 r_name_offset = le16_to_cpu(r->xe_name_offset);

        if (l_name_offset < r_name_offset)
                return 1;
        if (l_name_offset > r_name_offset)
                return -1;
        return 0;
}

/*
 * defrag a xattr bucket if we find that the bucket has some
 * holes beteen name/value pairs.
 * We will move all the name/value pairs to the end of the bucket
 * so that we can spare some space for insertion.
 */
static int ocfs2_defrag_xattr_bucket(struct inode *inode,
                                     struct ocfs2_xattr_bucket *bucket)
{
        int ret, i;
        size_t end, offset, len, value_len;
        struct ocfs2_xattr_header *xh;
        char *entries, *buf, *bucket_buf = NULL;
        u64 blkno = bucket->bhs[0]->b_blocknr;
        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
        u16 xh_free_start;
        size_t blocksize = inode->i_sb->s_blocksize;
        handle_t *handle;
        struct buffer_head **bhs;
        struct ocfs2_xattr_entry *xe;

        bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
                        GFP_NOFS);
        if (!bhs)
                return -ENOMEM;

        ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket, bhs, 0);
        if (ret)
                goto out;

        /*
         * In order to make the operation more efficient and generic,
         * we copy all the blocks into a contiguous memory and do the
         * defragment there, so if anything is error, we will not touch
         * the real block.
         */
        bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
        if (!bucket_buf) {
                ret = -EIO;
                goto out;
        }

        buf = bucket_buf;
        for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
                memcpy(buf, bhs[i]->b_data, blocksize);

        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                handle = NULL;
                mlog_errno(ret);
                goto out;
        }

        for (i = 0; i < blk_per_bucket; i++) {
                ret = ocfs2_journal_access(handle, inode, bhs[i],
                                           OCFS2_JOURNAL_ACCESS_WRITE);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto commit;
                }
        }

        xh = (struct ocfs2_xattr_header *)bucket_buf;
        entries = (char *)xh->xh_entries;
        xh_free_start = le16_to_cpu(xh->xh_free_start);

        mlog(0, "adjust xattr bucket in %llu, count = %u, "
             "xh_free_start = %u, xh_name_value_len = %u.\n",
             blkno, le16_to_cpu(xh->xh_count), xh_free_start,
             le16_to_cpu(xh->xh_name_value_len));

        /*
         * sort all the entries by their offset.
         * the largest will be the first, so that we can
         * move them to the end one by one.
         */
        sort(entries, le16_to_cpu(xh->xh_count),
             sizeof(struct ocfs2_xattr_entry),
             cmp_xe_offset, swap_xe);

        /* Move all name/values to the end of the bucket. */
        xe = xh->xh_entries;
        end = OCFS2_XATTR_BUCKET_SIZE;
        for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
                offset = le16_to_cpu(xe->xe_name_offset);
                if (ocfs2_xattr_is_local(xe))
                        value_len = OCFS2_XATTR_SIZE(
                                        le64_to_cpu(xe->xe_value_size));
                else
                        value_len = OCFS2_XATTR_ROOT_SIZE;
                len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;

                /*
                 * We must make sure that the name/value pair
                 * exist in the same block. So adjust end to
                 * the previous block end if needed.
                 */
                if (((end - len) / blocksize !=
                        (end - 1) / blocksize))
                        end = end - end % blocksize;

                if (end > offset + len) {
                        memmove(bucket_buf + end - len,
                                bucket_buf + offset, len);
                        xe->xe_name_offset = cpu_to_le16(end - len);
                }

                mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
                                "bucket %llu\n", (unsigned long long)blkno);

                end -= len;
        }

        mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
                        "bucket %llu\n", (unsigned long long)blkno);

        if (xh_free_start == end)
                goto commit;

        memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
        xh->xh_free_start = cpu_to_le16(end);

        /* sort the entries by their name_hash. */
        sort(entries, le16_to_cpu(xh->xh_count),
             sizeof(struct ocfs2_xattr_entry),
             cmp_xe, swap_xe);

        buf = bucket_buf;
        for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
                memcpy(bhs[i]->b_data, buf, blocksize);
                ocfs2_journal_dirty(handle, bhs[i]);
        }

commit:
        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:

        if (bhs) {
                for (i = 0; i < blk_per_bucket; i++)
                        brelse(bhs[i]);
        }
        kfree(bhs);

        kfree(bucket_buf);
        return ret;
}

/*
 * Move half nums of the xattr bucket in the previous cluster to this new
 * cluster. We only touch the last cluster of the previous extend record.
 *
 * first_bh is the first buffer_head of a series of bucket in the same
 * extent rec and header_bh is the header of one bucket in this cluster.
 * They will be updated if we move the data header_bh contains to the new
 * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
 */
static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
                                               handle_t *handle,
                                               struct buffer_head **first_bh,
                                               struct buffer_head **header_bh,
                                               u64 new_blkno,
                                               u64 prev_blkno,
                                               u32 num_clusters,
                                               u32 *first_hash)
{
        int i, ret, credits;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
        int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
        int blocksize = inode->i_sb->s_blocksize;
        struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
        struct ocfs2_xattr_header *new_xh;
        struct ocfs2_xattr_header *xh =
                        (struct ocfs2_xattr_header *)((*first_bh)->b_data);

        BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
        BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);

        prev_bh = *first_bh;
        get_bh(prev_bh);
        xh = (struct ocfs2_xattr_header *)prev_bh->b_data;

        prev_blkno += (num_clusters - 1) * bpc + bpc / 2;

        mlog(0, "move half of xattrs in cluster %llu to %llu\n",
             prev_blkno, new_blkno);

        /*
         * We need to update the 1st half of the new cluster and
         * 1 more for the update of the 1st bucket of the previous
         * extent record.
         */
        credits = bpc / 2 + 1;
        ret = ocfs2_extend_trans(handle, credits);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_journal_access(handle, inode, prev_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
                old_bh = new_bh = NULL;
                new_bh = sb_getblk(inode->i_sb, new_blkno);
                if (!new_bh) {
                        ret = -EIO;
                        mlog_errno(ret);
                        goto out;
                }

                ocfs2_set_new_buffer_uptodate(inode, new_bh);

                ret = ocfs2_journal_access(handle, inode, new_bh,
                                           OCFS2_JOURNAL_ACCESS_CREATE);
                if (ret < 0) {
                        mlog_errno(ret);
                        brelse(new_bh);
                        goto out;
                }

                ret = ocfs2_read_block(inode, prev_blkno, &old_bh);
                if (ret < 0) {
                        mlog_errno(ret);
                        brelse(new_bh);
                        goto out;
                }

                memcpy(new_bh->b_data, old_bh->b_data, blocksize);

                if (i == 0) {
                        new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
                        new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);

                        if (first_hash)
                                *first_hash = le32_to_cpu(
                                        new_xh->xh_entries[0].xe_name_hash);
                        new_first_bh = new_bh;
                        get_bh(new_first_bh);
                }

                ocfs2_journal_dirty(handle, new_bh);

                if (*header_bh == old_bh) {
                        brelse(*header_bh);
                        *header_bh = new_bh;
                        get_bh(*header_bh);

                        brelse(*first_bh);
                        *first_bh = new_first_bh;
                        get_bh(*first_bh);
                }
                brelse(new_bh);
                brelse(old_bh);
        }

        le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));

        ocfs2_journal_dirty(handle, prev_bh);
out:
        brelse(prev_bh);
        brelse(new_first_bh);
        return ret;
}

static int ocfs2_read_xattr_bucket(struct inode *inode,
                                   u64 blkno,
                                   struct buffer_head **bhs,
                                   int new)
{
        int ret = 0;
        u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);

        if (!new)
                return ocfs2_read_blocks(inode, blkno,
                                         blk_per_bucket, bhs, 0);

        for (i = 0; i < blk_per_bucket; i++) {
                bhs[i] = sb_getblk(inode->i_sb, blkno + i);
                if (bhs[i] == NULL) {
                        ret = -EIO;
                        mlog_errno(ret);
                        break;
                }
                ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
        }

        return ret;
}

/*
 * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
 * first_hash will record the 1st hash of the new bucket.
 */
static int ocfs2_half_xattr_bucket(struct inode *inode,
                                   handle_t *handle,
                                   u64 blk,
                                   u64 new_blk,
                                   u32 *first_hash,
                                   int new_bucket_head)
{
        int ret, i;
        u16 count, start, len, name_value_len, xe_len, name_offset;
        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
        struct buffer_head **s_bhs, **t_bhs = NULL;
        struct ocfs2_xattr_header *xh;
        struct ocfs2_xattr_entry *xe;
        int blocksize = inode->i_sb->s_blocksize;

        mlog(0, "move half of xattrs from bucket %llu to %llu\n",
             blk, new_blk);

        s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
        if (!s_bhs)
                return -ENOMEM;

        ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_journal_access(handle, inode, s_bhs[0],
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
        if (!t_bhs) {
                ret = -ENOMEM;
                goto out;
        }

        ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        for (i = 0; i < blk_per_bucket; i++) {
                ret = ocfs2_journal_access(handle, inode, t_bhs[i],
                                           OCFS2_JOURNAL_ACCESS_CREATE);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }
        }

        /* copy the whole bucket to the new first. */
        for (i = 0; i < blk_per_bucket; i++)
                memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);

        /* update the new bucket. */
        xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
        count = le16_to_cpu(xh->xh_count);
        start = count / 2;

        /*
         * Calculate the total name/value len and xh_free_start for
         * the old bucket first.
         */
        name_offset = OCFS2_XATTR_BUCKET_SIZE;
        name_value_len = 0;
        for (i = 0; i < start; i++) {
                xe = &xh->xh_entries[i];
                xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
                if (ocfs2_xattr_is_local(xe))
                        xe_len +=
                           OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
                else
                        xe_len += OCFS2_XATTR_ROOT_SIZE;
                name_value_len += xe_len;
                if (le16_to_cpu(xe->xe_name_offset) < name_offset)
                        name_offset = le16_to_cpu(xe->xe_name_offset);
        }

        /*
         * Now begin the modification to the new bucket.
         *
         * In the new bucket, We just move the xattr entry to the beginning
         * and don't touch the name/value. So there will be some holes in the
         * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
         * called.
         */
        xe = &xh->xh_entries[start];
        len = sizeof(struct ocfs2_xattr_entry) * (count - start);
        mlog(0, "mv xattr entry len %d from %d to %d\n", len,
             (int)((char *)xe - (char *)xh),
             (int)((char *)xh->xh_entries - (char *)xh));
        memmove((char *)xh->xh_entries, (char *)xe, len);
        xe = &xh->xh_entries[count - start];
        len = sizeof(struct ocfs2_xattr_entry) * start;
        memset((char *)xe, 0, len);

        le16_add_cpu(&xh->xh_count, -start);
        le16_add_cpu(&xh->xh_name_value_len, -name_value_len);

        /* Calculate xh_free_start for the new bucket. */
        xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
        for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
                xe = &xh->xh_entries[i];
                xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
                if (ocfs2_xattr_is_local(xe))
                        xe_len +=
                           OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
                else
                        xe_len += OCFS2_XATTR_ROOT_SIZE;
                if (le16_to_cpu(xe->xe_name_offset) <
                    le16_to_cpu(xh->xh_free_start))
                        xh->xh_free_start = xe->xe_name_offset;
        }

        /* set xh->xh_num_buckets for the new xh. */
        if (new_bucket_head)
                xh->xh_num_buckets = cpu_to_le16(1);
        else
                xh->xh_num_buckets = 0;

        for (i = 0; i < blk_per_bucket; i++) {
                ocfs2_journal_dirty(handle, t_bhs[i]);
                if (ret)
                        mlog_errno(ret);
        }

        /* store the first_hash of the new bucket. */
        if (first_hash)
                *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);

        /*
         * Now only update the 1st block of the old bucket.
         * Please note that the entry has been sorted already above.
         */
        xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
        memset(&xh->xh_entries[start], 0,
               sizeof(struct ocfs2_xattr_entry) * (count - start));
        xh->xh_count = cpu_to_le16(start);
        xh->xh_free_start = cpu_to_le16(name_offset);
        xh->xh_name_value_len = cpu_to_le16(name_value_len);

        ocfs2_journal_dirty(handle, s_bhs[0]);
        if (ret)
                mlog_errno(ret);

out:
        if (s_bhs) {
                for (i = 0; i < blk_per_bucket; i++)
                        brelse(s_bhs[i]);
        }
        kfree(s_bhs);

        if (t_bhs) {
                for (i = 0; i < blk_per_bucket; i++)
                        brelse(t_bhs[i]);
        }
        kfree(t_bhs);

        return ret;
}

/*
 * Copy xattr from one bucket to another bucket.
 *
 * The caller must make sure that the journal transaction
 * has enough space for journaling.
 */
static int ocfs2_cp_xattr_bucket(struct inode *inode,
                                 handle_t *handle,
                                 u64 s_blkno,
                                 u64 t_blkno,
                                 int t_is_new)
{
        int ret, i;
        int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
        int blocksize = inode->i_sb->s_blocksize;
        struct buffer_head **s_bhs, **t_bhs = NULL;

        BUG_ON(s_blkno == t_blkno);

        mlog(0, "cp bucket %llu to %llu, target is %d\n",
             s_blkno, t_blkno, t_is_new);

        s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
                        GFP_NOFS);
        if (!s_bhs)
                return -ENOMEM;

        ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
        if (ret)
                goto out;

        t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
                        GFP_NOFS);
        if (!t_bhs) {
                ret = -ENOMEM;
                goto out;
        }

        ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
        if (ret)
                goto out;

        for (i = 0; i < blk_per_bucket; i++) {
                ret = ocfs2_journal_access(handle, inode, t_bhs[i],
                                           OCFS2_JOURNAL_ACCESS_WRITE);
                if (ret)
                        goto out;
        }

        for (i = 0; i < blk_per_bucket; i++) {
                memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
                ocfs2_journal_dirty(handle, t_bhs[i]);
        }

out:
        if (s_bhs) {
                for (i = 0; i < blk_per_bucket; i++)
                        brelse(s_bhs[i]);
        }
        kfree(s_bhs);

        if (t_bhs) {
                for (i = 0; i < blk_per_bucket; i++)
                        brelse(t_bhs[i]);
        }
        kfree(t_bhs);

        return ret;
}

/*
 * Copy one xattr cluster from src_blk to to_blk.
 * The to_blk will become the first bucket header of the cluster, so its
 * xh_num_buckets will be initialized as the bucket num in the cluster.
 */
static int ocfs2_cp_xattr_cluster(struct inode *inode,
                                  handle_t *handle,
                                  struct buffer_head *first_bh,
                                  u64 src_blk,
                                  u64 to_blk,
                                  u32 *first_hash)
{
        int i, ret, credits;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
        int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
        struct buffer_head *bh = NULL;
        struct ocfs2_xattr_header *xh;
        u64 to_blk_start = to_blk;

        mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);

        /*
         * We need to update the new cluster and 1 more for the update of
         * the 1st bucket of the previous extent rec.
         */
        credits = bpc + 1;
        ret = ocfs2_extend_trans(handle, credits);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_journal_access(handle, inode, first_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        for (i = 0; i < num_buckets; i++) {
                ret = ocfs2_cp_xattr_bucket(inode, handle,
                                            src_blk, to_blk, 1);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
                to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
        }

        /* update the old bucket header. */
        xh = (struct ocfs2_xattr_header *)first_bh->b_data;
        le16_add_cpu(&xh->xh_num_buckets, -num_buckets);

        ocfs2_journal_dirty(handle, first_bh);

        /* update the new bucket header. */
        ret = ocfs2_read_block(inode, to_blk_start, &bh);
        if (ret < 0) {
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_journal_access(handle, inode, bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        xh = (struct ocfs2_xattr_header *)bh->b_data;
        xh->xh_num_buckets = cpu_to_le16(num_buckets);

        ocfs2_journal_dirty(handle, bh);

        if (first_hash)
                *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
out:
        brelse(bh);
        return ret;
}

/*
 * Move half of the xattrs in this cluster to the new cluster.
 * This function should only be called when bucket size == cluster size.
 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
 */
static int ocfs2_half_xattr_cluster(struct inode *inode,
                                    handle_t *handle,
                                    u64 prev_blk,
                                    u64 new_blk,
                                    u32 *first_hash)
{
        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
        int ret, credits = 2 * blk_per_bucket;

        BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);

        ret = ocfs2_extend_trans(handle, credits);
        if (ret) {
                mlog_errno(ret);
                return ret;
        }

        /* Move half of the xattr in start_blk to the next bucket. */
        return  ocfs2_half_xattr_bucket(inode, handle, prev_blk,
                                        new_blk, first_hash, 1);
}

/*
 * Move some xattrs from the old cluster to the new one since they are not
 * contiguous in ocfs2 xattr tree.
 *
 * new_blk starts a new separate cluster, and we will move some xattrs from
 * prev_blk to it. v_start will be set as the first name hash value in this
 * new cluster so that it can be used as e_cpos during tree insertion and
 * don't collide with our original b-tree operations. first_bh and header_bh
 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
 * to extend the insert bucket.
 *
 * The problem is how much xattr should we move to the new one and when should
 * we update first_bh and header_bh?
 * 1. If cluster size > bucket size, that means the previous cluster has more
 *    than 1 bucket, so just move half nums of bucket into the new cluster and
 *    update the first_bh and header_bh if the insert bucket has been moved
 *    to the new cluster.
 * 2. If cluster_size == bucket_size:
 *    a) If the previous extent rec has more than one cluster and the insert
 *       place isn't in the last cluster, copy the entire last cluster to the
 *       new one. This time, we don't need to upate the first_bh and header_bh
 *       since they will not be moved into the new cluster.
 *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
 *       the new one. And we set the extend flag to zero if the insert place is
 *       moved into the new allocated cluster since no extend is needed.
 */
static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
                                            handle_t *handle,
                                            struct buffer_head **first_bh,
                                            struct buffer_head **header_bh,
                                            u64 new_blk,
                                            u64 prev_blk,
                                            u32 prev_clusters,
                                            u32 *v_start,
                                            int *extend)
{
        int ret = 0;
        int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);

        mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
             prev_blk, prev_clusters, new_blk);

        if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
                ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
                                                          handle,
                                                          first_bh,
                                                          header_bh,
                                                          new_blk,
                                                          prev_blk,
                                                          prev_clusters,
                                                          v_start);
        else {
                u64 last_blk = prev_blk + bpc * (prev_clusters - 1);

                if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
                        ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
                                                     last_blk, new_blk,
                                                     v_start);
                else {
                        ret = ocfs2_half_xattr_cluster(inode, handle,
                                                       last_blk, new_blk,
                                                       v_start);

                        if ((*header_bh)->b_blocknr == last_blk && extend)
                                *extend = 0;
                }
        }

        return ret;
}

/*
 * Add a new cluster for xattr storage.
 *
 * If the new cluster is contiguous with the previous one, it will be
 * appended to the same extent record, and num_clusters will be updated.
 * If not, we will insert a new extent for it and move some xattrs in
 * the last cluster into the new allocated one.
 * We also need to limit the maximum size of a btree leaf, otherwise we'll
 * lose the benefits of hashing because we'll have to search large leaves.
 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
 * if it's bigger).
 *
 * first_bh is the first block of the previous extent rec and header_bh
 * indicates the bucket we will insert the new xattrs. They will be updated
 * when the header_bh is moved into the new cluster.
 */
static int ocfs2_add_new_xattr_cluster(struct inode *inode,
                                       struct buffer_head *root_bh,
                                       struct buffer_head **first_bh,
                                       struct buffer_head **header_bh,
                                       u32 *num_clusters,
                                       u32 prev_cpos,
                                       u64 prev_blkno,
                                       int *extend)
{
        int ret, credits;
        u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
        u32 prev_clusters = *num_clusters;
        u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
        u64 block;
        handle_t *handle = NULL;
        struct ocfs2_alloc_context *data_ac = NULL;
        struct ocfs2_alloc_context *meta_ac = NULL;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        struct ocfs2_extent_tree et;

        mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
             "previous xattr blkno = %llu\n",
             (unsigned long long)OCFS2_I(inode)->ip_blkno,
             prev_cpos, prev_blkno);

        ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);

        ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
                                    &data_ac, &meta_ac);
        if (ret) {
                mlog_errno(ret);
                goto leave;
        }

        credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
                                            clusters_to_add);
        handle = ocfs2_start_trans(osb, credits);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                handle = NULL;
                mlog_errno(ret);
                goto leave;
        }

        ret = ocfs2_journal_access(handle, inode, root_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret < 0) {
                mlog_errno(ret);
                goto leave;
        }

        ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
                                     clusters_to_add, &bit_off, &num_bits);
        if (ret < 0) {
                if (ret != -ENOSPC)
                        mlog_errno(ret);
                goto leave;
        }

        BUG_ON(num_bits > clusters_to_add);

        block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
        mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
             num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);

        if (prev_blkno + prev_clusters * bpc == block &&
            (prev_clusters + num_bits) << osb->s_clustersize_bits <=
             OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
                /*
                 * If this cluster is contiguous with the old one and
                 * adding this new cluster, we don't surpass the limit of
                 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
                 * initialized and used like other buckets in the previous
                 * cluster.
                 * So add it as a contiguous one. The caller will handle
                 * its init process.
                 */
                v_start = prev_cpos + prev_clusters;
                *num_clusters = prev_clusters + num_bits;
                mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
                     num_bits);
        } else {
                ret = ocfs2_adjust_xattr_cross_cluster(inode,
                                                       handle,
                                                       first_bh,
                                                       header_bh,
                                                       block,
                                                       prev_blkno,
                                                       prev_clusters,
                                                       &v_start,
                                                       extend);
                if (ret) {
                        mlog_errno(ret);
                        goto leave;
                }
        }

        if (handle->h_buffer_credits < credits) {
                /*
                 * The journal has been restarted before, and don't
                 * have enough space for the insertion, so extend it
                 * here.
                 */
                ret = ocfs2_extend_trans(handle, credits);
                if (ret) {
                        mlog_errno(ret);
                        goto leave;
                }
        }
        mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
             num_bits, block, v_start);
        ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
                                  num_bits, 0, meta_ac);
        if (ret < 0) {
                mlog_errno(ret);
                goto leave;
        }

        ret = ocfs2_journal_dirty(handle, root_bh);
        if (ret < 0) {
                mlog_errno(ret);
                goto leave;
        }

leave:
        if (handle)
                ocfs2_commit_trans(osb, handle);
        if (data_ac)
                ocfs2_free_alloc_context(data_ac);
        if (meta_ac)
                ocfs2_free_alloc_context(meta_ac);

        return ret;
}

/*
 * Extend a new xattr bucket and move xattrs to the end one by one until
 * We meet with start_bh. Only move half of the xattrs to the bucket after it.
 */
static int ocfs2_extend_xattr_bucket(struct inode *inode,
                                     struct buffer_head *first_bh,
                                     struct buffer_head *start_bh,
                                     u32 num_clusters)
{
        int ret, credits;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
        u64 start_blk = start_bh->b_blocknr, end_blk;
        u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
        handle_t *handle;
        struct ocfs2_xattr_header *first_xh =
                                (struct ocfs2_xattr_header *)first_bh->b_data;
        u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);

        mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
             "from %llu, len = %u\n", start_blk,
             (unsigned long long)first_bh->b_blocknr, num_clusters);

        BUG_ON(bucket >= num_buckets);

        end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;

        /*
         * We will touch all the buckets after the start_bh(include it).
         * Add one more bucket and modify the first_bh.
         */
        credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
        handle = ocfs2_start_trans(osb, credits);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                handle = NULL;
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_journal_access(handle, inode, first_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto commit;
        }

        while (end_blk != start_blk) {
                ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
                                            end_blk + blk_per_bucket, 0);
                if (ret)
                        goto commit;
                end_blk -= blk_per_bucket;
        }

        /* Move half of the xattr in start_blk to the next bucket. */
        ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
                                      start_blk + blk_per_bucket, NULL, 0);

        le16_add_cpu(&first_xh->xh_num_buckets, 1);
        ocfs2_journal_dirty(handle, first_bh);

commit:
        ocfs2_commit_trans(osb, handle);
out:
        return ret;
}

/*
 * Add new xattr bucket in an extent record and adjust the buckets accordingly.
 * xb_bh is the ocfs2_xattr_block.
 * We will move all the buckets starting from header_bh to the next place. As
 * for this one, half num of its xattrs will be moved to the next one.
 *
 * We will allocate a new cluster if current cluster is full and adjust
 * header_bh and first_bh if the insert place is moved to the new cluster.
 */
static int ocfs2_add_new_xattr_bucket(struct inode *inode,
                                      struct buffer_head *xb_bh,
                                      struct buffer_head *header_bh)
{
        struct ocfs2_xattr_header *first_xh = NULL;
        struct buffer_head *first_bh = NULL;
        struct ocfs2_xattr_block *xb =
                        (struct ocfs2_xattr_block *)xb_bh->b_data;
        struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
        struct ocfs2_extent_list *el = &xb_root->xt_list;
        struct ocfs2_xattr_header *xh =
                        (struct ocfs2_xattr_header *)header_bh->b_data;
        u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
        struct super_block *sb = inode->i_sb;
        struct ocfs2_super *osb = OCFS2_SB(sb);
        int ret, num_buckets, extend = 1;
        u64 p_blkno;
        u32 e_cpos, num_clusters;

        mlog(0, "Add new xattr bucket starting form %llu\n",
             (unsigned long long)header_bh->b_blocknr);

        /*
         * Add refrence for header_bh here because it may be
         * changed in ocfs2_add_new_xattr_cluster and we need
         * to free it in the end.
         */
        get_bh(header_bh);

        ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
                                  &num_clusters, el);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_read_block(inode, p_blkno, &first_bh);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
        first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;

        if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
                ret = ocfs2_add_new_xattr_cluster(inode,
                                                  xb_bh,
                                                  &first_bh,
                                                  &header_bh,
                                                  &num_clusters,
                                                  e_cpos,
                                                  p_blkno,
                                                  &extend);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }
        }

        if (extend)
                ret = ocfs2_extend_xattr_bucket(inode,
                                                first_bh,
                                                header_bh,
                                                num_clusters);
        if (ret)
                mlog_errno(ret);
out:
        brelse(first_bh);
        brelse(header_bh);
        return ret;
}

static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
                                        struct ocfs2_xattr_bucket *bucket,
                                        int offs)
{
        int block_off = offs >> inode->i_sb->s_blocksize_bits;

        offs = offs % inode->i_sb->s_blocksize;
        return bucket->bhs[block_off]->b_data + offs;
}

/*
 * Handle the normal xattr set, including replace, delete and new.
 *
 * Note: "local" indicates the real data's locality. So we can't
 * just its bucket locality by its length.
 */
static void ocfs2_xattr_set_entry_normal(struct inode *inode,
                                         struct ocfs2_xattr_info *xi,
                                         struct ocfs2_xattr_search *xs,
                                         u32 name_hash,
                                         int local)
{
        struct ocfs2_xattr_entry *last, *xe;
        int name_len = strlen(xi->name);
        struct ocfs2_xattr_header *xh = xs->header;
        u16 count = le16_to_cpu(xh->xh_count), start;
        size_t blocksize = inode->i_sb->s_blocksize;
        char *val;
        size_t offs, size, new_size;

        last = &xh->xh_entries[count];
        if (!xs->not_found) {
                xe = xs->here;
                offs = le16_to_cpu(xe->xe_name_offset);
                if (ocfs2_xattr_is_local(xe))
                        size = OCFS2_XATTR_SIZE(name_len) +
                        OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
                else
                        size = OCFS2_XATTR_SIZE(name_len) +
                        OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);

                /*
                 * If the new value will be stored outside, xi->value has been
                 * initalized as an empty ocfs2_xattr_value_root, and the same
                 * goes with xi->value_len, so we can set new_size safely here.
                 * See ocfs2_xattr_set_in_bucket.
                 */
                new_size = OCFS2_XATTR_SIZE(name_len) +
                           OCFS2_XATTR_SIZE(xi->value_len);

                le16_add_cpu(&xh->xh_name_value_len, -size);
                if (xi->value) {
                        if (new_size > size)
                                goto set_new_name_value;

                        /* Now replace the old value with new one. */
                        if (local)
                                xe->xe_value_size = cpu_to_le64(xi->value_len);
                        else
                                xe->xe_value_size = 0;

                        val = ocfs2_xattr_bucket_get_val(inode,
                                                         &xs->bucket, offs);
                        memset(val + OCFS2_XATTR_SIZE(name_len), 0,
                               size - OCFS2_XATTR_SIZE(name_len));
                        if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
                                memcpy(val + OCFS2_XATTR_SIZE(name_len),
                                       xi->value, xi->value_len);

                        le16_add_cpu(&xh->xh_name_value_len, new_size);
                        ocfs2_xattr_set_local(xe, local);
                        return;
                } else {
                        /*
                         * Remove the old entry if there is more than one.
                         * We don't remove the last entry so that we can
                         * use it to indicate the hash value of the empty
                         * bucket.
                         */
                        last -= 1;
                        le16_add_cpu(&xh->xh_count, -1);
                        if (xh->xh_count) {
                                memmove(xe, xe + 1,
                                        (void *)last - (void *)xe);
                                memset(last, 0,
                                       sizeof(struct ocfs2_xattr_entry));
                        } else
                                xh->xh_free_start =
                                        cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);

                        return;
                }
        } else {
                /* find a new entry for insert. */
                int low = 0, high = count - 1, tmp;
                struct ocfs2_xattr_entry *tmp_xe;

                while (low <= high && count) {
                        tmp = (low + high) / 2;
                        tmp_xe = &xh->xh_entries[tmp];

                        if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
                                low = tmp + 1;
                        else if (name_hash <
                                 le32_to_cpu(tmp_xe->xe_name_hash))
                                high = tmp - 1;
                        else {
                                low = tmp;
                                break;
                        }
                }

                xe = &xh->xh_entries[low];
                if (low != count)
                        memmove(xe + 1, xe, (void *)last - (void *)xe);

                le16_add_cpu(&xh->xh_count, 1);
                memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
                xe->xe_name_hash = cpu_to_le32(name_hash);
                xe->xe_name_len = name_len;
                ocfs2_xattr_set_type(xe, xi->name_index);
        }

set_new_name_value:
        /* Insert the new name+value. */
        size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);

        /*
         * We must make sure that the name/value pair
         * exists in the same block.
         */
        offs = le16_to_cpu(xh->xh_free_start);
        start = offs - size;

        if (start >> inode->i_sb->s_blocksize_bits !=
            (offs - 1) >> inode->i_sb->s_blocksize_bits) {
                offs = offs - offs % blocksize;
                xh->xh_free_start = cpu_to_le16(offs);
        }

        val = ocfs2_xattr_bucket_get_val(inode,
                                         &xs->bucket, offs - size);
        xe->xe_name_offset = cpu_to_le16(offs - size);

        memset(val, 0, size);
        memcpy(val, xi->name, name_len);
        memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);

        xe->xe_value_size = cpu_to_le64(xi->value_len);
        ocfs2_xattr_set_local(xe, local);
        xs->here = xe;
        le16_add_cpu(&xh->xh_free_start, -size);
        le16_add_cpu(&xh->xh_name_value_len, size);

        return;
}

static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
                                             handle_t *handle,
                                             struct ocfs2_xattr_search *xs,
                                             struct buffer_head **bhs,
                                             u16 bh_num)
{
        int ret = 0, off, block_off;
        struct ocfs2_xattr_entry *xe = xs->here;

        /*
         * First calculate all the blocks we should journal_access
         * and journal_dirty. The first block should always be touched.
         */
        ret = ocfs2_journal_dirty(handle, bhs[0]);
        if (ret)
                mlog_errno(ret);

        /* calc the data. */
        off = le16_to_cpu(xe->xe_name_offset);
        block_off = off >> inode->i_sb->s_blocksize_bits;
        ret = ocfs2_journal_dirty(handle, bhs[block_off]);
        if (ret)
                mlog_errno(ret);

        return ret;
}

/*
 * Set the xattr entry in the specified bucket.
 * The bucket is indicated by xs->bucket and it should have the enough
 * space for the xattr insertion.
 */
static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
                                           struct ocfs2_xattr_info *xi,
                                           struct ocfs2_xattr_search *xs,
                                           u32 name_hash,
                                           int local)
{
        int i, ret;
        handle_t *handle = NULL;
        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

        mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
             (unsigned long)xi->value_len, xi->name_index,
             (unsigned long long)xs->bucket.bhs[0]->b_blocknr);

        if (!xs->bucket.bhs[1]) {
                ret = ocfs2_read_blocks(inode,
                                        xs->bucket.bhs[0]->b_blocknr + 1,
                                        blk_per_bucket - 1, &xs->bucket.bhs[1],
                                        0);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }
        }

        handle = ocfs2_start_trans(osb, blk_per_bucket);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                handle = NULL;
                mlog_errno(ret);
                goto out;
        }

        for (i = 0; i < blk_per_bucket; i++) {
                ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
                                           OCFS2_JOURNAL_ACCESS_WRITE);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out;
                }
        }

        ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);

        /*Only dirty the blocks we have touched in set xattr. */
        ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
                                                xs->bucket.bhs, blk_per_bucket);
        if (ret)
                mlog_errno(ret);
out:
        ocfs2_commit_trans(osb, handle);

        return ret;
}

static int ocfs2_xattr_value_update_size(struct inode *inode,
                                         struct buffer_head *xe_bh,
                                         struct ocfs2_xattr_entry *xe,
                                         u64 new_size)
{
        int ret;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        handle_t *handle = NULL;

        handle = ocfs2_start_trans(osb, 1);
        if (handle == NULL) {
                ret = -ENOMEM;
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_journal_access(handle, inode, xe_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret < 0) {
                mlog_errno(ret);
                goto out_commit;
        }

        xe->xe_value_size = cpu_to_le64(new_size);

        ret = ocfs2_journal_dirty(handle, xe_bh);
        if (ret < 0)
                mlog_errno(ret);

out_commit:
        ocfs2_commit_trans(osb, handle);
out:
        return ret;
}

/*
 * Truncate the specified xe_off entry in xattr bucket.
 * bucket is indicated by header_bh and len is the new length.
 * Both the ocfs2_xattr_value_root and the entry will be updated here.
 *
 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
 */
static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
                                             struct buffer_head *header_bh,
                                             int xe_off,
                                             int len)
{
        int ret, offset;
        u64 value_blk;
        struct buffer_head *value_bh = NULL;
        struct ocfs2_xattr_value_root *xv;
        struct ocfs2_xattr_entry *xe;
        struct ocfs2_xattr_header *xh =
                        (struct ocfs2_xattr_header *)header_bh->b_data;
        size_t blocksize = inode->i_sb->s_blocksize;

        xe = &xh->xh_entries[xe_off];

        BUG_ON(!xe || ocfs2_xattr_is_local(xe));

        offset = le16_to_cpu(xe->xe_name_offset) +
                 OCFS2_XATTR_SIZE(xe->xe_name_len);

        value_blk = offset / blocksize;

        /* We don't allow ocfs2_xattr_value to be stored in different block. */
        BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
        value_blk += header_bh->b_blocknr;

        ret = ocfs2_read_block(inode, value_blk, &value_bh);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        xv = (struct ocfs2_xattr_value_root *)
                (value_bh->b_data + offset % blocksize);

        mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
             xe_off, (unsigned long long)header_bh->b_blocknr, len);
        ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

out:
        brelse(value_bh);
        return ret;
}

static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
                                                struct ocfs2_xattr_search *xs,
                                                int len)
{
        int ret, offset;
        struct ocfs2_xattr_entry *xe = xs->here;
        struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;

        BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));

        offset = xe - xh->xh_entries;
        ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
                                                offset, len);
        if (ret)
                mlog_errno(ret);

        return ret;
}

static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
                                                struct ocfs2_xattr_search *xs,
                                                char *val,
                                                int value_len)
{
        int offset;
        struct ocfs2_xattr_value_root *xv;
        struct ocfs2_xattr_entry *xe = xs->here;

        BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));

        offset = le16_to_cpu(xe->xe_name_offset) +
                 OCFS2_XATTR_SIZE(xe->xe_name_len);

        xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);

        return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
}

static int ocfs2_rm_xattr_cluster(struct inode *inode,
                                  struct buffer_head *root_bh,
                                  u64 blkno,
                                  u32 cpos,
                                  u32 len)
{
        int ret;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
        struct inode *tl_inode = osb->osb_tl_inode;
        handle_t *handle;
        struct ocfs2_xattr_block *xb =
                        (struct ocfs2_xattr_block *)root_bh->b_data;
        struct ocfs2_alloc_context *meta_ac = NULL;
        struct ocfs2_cached_dealloc_ctxt dealloc;
        struct ocfs2_extent_tree et;

        ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);

        ocfs2_init_dealloc_ctxt(&dealloc);

        mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
             cpos, len, (unsigned long long)blkno);

        ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);

        ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
        if (ret) {
                mlog_errno(ret);
                return ret;
        }

        mutex_lock(&tl_inode->i_mutex);

        if (ocfs2_truncate_log_needs_flush(osb)) {
                ret = __ocfs2_flush_truncate_log(osb);
                if (ret < 0) {
                        mlog_errno(ret);
                        goto out;
                }
        }

        handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
        if (handle == NULL) {
                ret = -ENOMEM;
                mlog_errno(ret);
                goto out;
        }

        ret = ocfs2_journal_access(handle, inode, root_bh,
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
                                  &dealloc);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);

        ret = ocfs2_journal_dirty(handle, root_bh);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
        if (ret)
                mlog_errno(ret);

out_commit:
        ocfs2_commit_trans(osb, handle);
out:
        ocfs2_schedule_truncate_log_flush(osb, 1);

        mutex_unlock(&tl_inode->i_mutex);

        if (meta_ac)
                ocfs2_free_alloc_context(meta_ac);

        ocfs2_run_deallocs(osb, &dealloc);

        return ret;
}

static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
                                         struct ocfs2_xattr_search *xs)
{
        handle_t *handle = NULL;
        struct ocfs2_xattr_header *xh = xs->bucket.xh;
        struct ocfs2_xattr_entry *last = &xh->xh_entries[
                                                le16_to_cpu(xh->xh_count) - 1];
        int ret = 0;

        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
        if (IS_ERR(handle)) {
                ret = PTR_ERR(handle);
                mlog_errno(ret);
                return;
        }

        ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
                                   OCFS2_JOURNAL_ACCESS_WRITE);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        /* Remove the old entry. */
        memmove(xs->here, xs->here + 1,
                (void *)last - (void *)xs->here);
        memset(last, 0, sizeof(struct ocfs2_xattr_entry));
        le16_add_cpu(&xh->xh_count, -1);

        ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
        if (ret < 0)
                mlog_errno(ret);
out_commit:
        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
}

/*
 * Set the xattr name/value in the bucket specified in xs.
 *
 * As the new value in xi may be stored in the bucket or in an outside cluster,
 * we divide the whole process into 3 steps:
 * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
 * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
 * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
 * 4. If the clusters for the new outside value can't be allocated, we need
 *    to free the xattr we allocated in set.
 */
static int ocfs2_xattr_set_in_bucket(struct inode *inode,
                                     struct ocfs2_xattr_info *xi,
                                     struct ocfs2_xattr_search *xs)
{
        int ret, local = 1;
        size_t value_len;
        char *val = (char *)xi->value;
        struct ocfs2_xattr_entry *xe = xs->here;
        u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
                                              strlen(xi->name));

        if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
                /*
                 * We need to truncate the xattr storage first.
                 *
                 * If both the old and new value are stored to
                 * outside block, we only need to truncate
                 * the storage and then set the value outside.
                 *
                 * If the new value should be stored within block,
                 * we should free all the outside block first and
                 * the modification to the xattr block will be done
                 * by following steps.
                 */
                if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
                        value_len = xi->value_len;
                else
                        value_len = 0;

                ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
                                                           value_len);
                if (ret)
                        goto out;

                if (value_len)
                        goto set_value_outside;
        }

        value_len = xi->value_len;
        /* So we have to handle the inside block change now. */
        if (value_len > OCFS2_XATTR_INLINE_SIZE) {
                /*
                 * If the new value will be stored outside of block,
                 * initalize a new empty value root and insert it first.
                 */
                local = 0;
                xi->value = &def_xv;
                xi->value_len = OCFS2_XATTR_ROOT_SIZE;
        }

        ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local);
        if (ret) {
                mlog_errno(ret);
                goto out;
        }

        if (value_len <= OCFS2_XATTR_INLINE_SIZE)
                goto out;

        /* allocate the space now for the outside block storage. */
        ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
                                                   value_len);
        if (ret) {
                mlog_errno(ret);

                if (xs->not_found) {
                        /*
                         * We can't allocate enough clusters for outside
                         * storage and we have allocated xattr already,
                         * so need to remove it.
                         */
                        ocfs2_xattr_bucket_remove_xs(inode, xs);
                }
                goto out;
        }

set_value_outside:
        ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
out:
        return ret;
}

/* check whether the xattr bucket is filled up with the same hash value. */
static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
                                              struct ocfs2_xattr_bucket *bucket)
{
        struct ocfs2_xattr_header *xh = bucket->xh;

        if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
            xh->xh_entries[0].xe_name_hash) {
                mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
                     "hash = %u\n",
                     (unsigned long long)bucket->bhs[0]->b_blocknr,
                     le32_to_cpu(xh->xh_entries[0].xe_name_hash));
                return -ENOSPC;
        }

        return 0;
}

static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
                                             struct ocfs2_xattr_info *xi,
                                             struct ocfs2_xattr_search *xs)
{
        struct ocfs2_xattr_header *xh;
        struct ocfs2_xattr_entry *xe;
        u16 count, header_size, xh_free_start;
        int i, free, max_free, need, old;
        size_t value_size = 0, name_len = strlen(xi->name);
        size_t blocksize = inode->i_sb->s_blocksize;
        int ret, allocation = 0;
        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);

        mlog_entry("Set xattr %s in xattr index block\n", xi->name);

try_again:
        xh = xs->header;
        count = le16_to_cpu(xh->xh_count);
        xh_free_start = le16_to_cpu(xh->xh_free_start);
        header_size = sizeof(struct ocfs2_xattr_header) +
                        count * sizeof(struct ocfs2_xattr_entry);
        max_free = OCFS2_XATTR_BUCKET_SIZE -
                le16_to_cpu(xh->xh_name_value_len) - header_size;

        mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
                        "of %u which exceed block size\n",
                        (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
                        header_size);

        if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
                value_size = OCFS2_XATTR_ROOT_SIZE;
        else if (xi->value)
                value_size = OCFS2_XATTR_SIZE(xi->value_len);

        if (xs->not_found)
                need = sizeof(struct ocfs2_xattr_entry) +
                        OCFS2_XATTR_SIZE(name_len) + value_size;
        else {
                need = value_size + OCFS2_XATTR_SIZE(name_len);

                /*
                 * We only replace the old value if the new length is smaller
                 * than the old one. Otherwise we will allocate new space in the
                 * bucket to store it.
                 */
                xe = xs->here;
                if (ocfs2_xattr_is_local(xe))
                        old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
                else
                        old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);

                if (old >= value_size)
                        need = 0;
        }

        free = xh_free_start - header_size;
        /*
         * We need to make sure the new name/value pair
         * can exist in the same block.
         */
        if (xh_free_start % blocksize < need)
                free -= xh_free_start % blocksize;

        mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
             "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
             " %u\n", xs->not_found,
             (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
             free, need, max_free, le16_to_cpu(xh->xh_free_start),
             le16_to_cpu(xh->xh_name_value_len));

        if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
                if (need <= max_free &&
                    count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
                        /*
                         * We can create the space by defragment. Since only the
                         * name/value will be moved, the xe shouldn't be changed
                         * in xs.
                         */
                        ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
                        if (ret) {
                                mlog_errno(ret);
                                goto out;
                        }

                        xh_free_start = le16_to_cpu(xh->xh_free_start);
                        free = xh_free_start - header_size;
                        if (xh_free_start % blocksize < need)
                                free -= xh_free_start % blocksize;

                        if (free >= need)
                                goto xattr_set;

                        mlog(0, "Can't get enough space for xattr insert by "
                             "defragment. Need %u bytes, but we have %d, so "
                             "allocate new bucket for it.\n", need, free);
                }

                /*
                 * We have to add new buckets or clusters and one
                 * allocation should leave us enough space for insert.
                 */
                BUG_ON(allocation);

                /*
                 * We do not allow for overlapping ranges between buckets. And
                 * the maximum number of collisions we will allow for then is
                 * one bucket's worth, so check it here whether we need to
                 * add a new bucket for the insert.
                 */
                ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                ret = ocfs2_add_new_xattr_bucket(inode,
                                                 xs->xattr_bh,
                                                 xs->bucket.bhs[0]);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                for (i = 0; i < blk_per_bucket; i++)
                        brelse(xs->bucket.bhs[i]);

                memset(&xs->bucket, 0, sizeof(xs->bucket));

                ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
                                                   xi->name_index,
                                                   xi->name, xs);
                if (ret && ret != -ENODATA)
                        goto out;
                xs->not_found = ret;
                allocation = 1;
                goto try_again;
        }

xattr_set:
        ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
out:
        mlog_exit(ret);
        return ret;
}

static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
                                        struct ocfs2_xattr_bucket *bucket,
                                        void *para)
{
        int ret = 0;
        struct ocfs2_xattr_header *xh = bucket->xh;
        u16 i;
        struct ocfs2_xattr_entry *xe;

        for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
                xe = &xh->xh_entries[i];
                if (ocfs2_xattr_is_local(xe))
                        continue;

                ret = ocfs2_xattr_bucket_value_truncate(inode,
                                                        bucket->bhs[0],
                                                        i, 0);
                if (ret) {
                        mlog_errno(ret);
                        break;
                }
        }

        return ret;
}

static int ocfs2_delete_xattr_index_block(struct inode *inode,
                                          struct buffer_head *xb_bh)
{
        struct ocfs2_xattr_block *xb =
                        (struct ocfs2_xattr_block *)xb_bh->b_data;
        struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
        int ret = 0;
        u32 name_hash = UINT_MAX, e_cpos, num_clusters;
        u64 p_blkno;

        if (le16_to_cpu(el->l_next_free_rec) == 0)
                return 0;

        while (name_hash > 0) {
                ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
                                          &e_cpos, &num_clusters, el);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
                                                  ocfs2_delete_xattr_in_bucket,
                                                  NULL);
                if (ret) {
                        mlog_errno(ret);
                        goto out;
                }

                ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
                                             p_blkno, e_cpos, num_clusters);
                if (ret) {
                        mlog_errno(ret);
                        break;
                }

                if (e_cpos == 0)
                        break;

                name_hash = e_cpos - 1;
        }

out:
        return ret;
}

/*
 * 'trusted' attributes support
 */

#define XATTR_TRUSTED_PREFIX "trusted."

static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
                                       size_t list_size, const char *name,
                                       size_t name_len)
{
        const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX) - 1;
        const size_t total_len = prefix_len + name_len + 1;

        if (list && total_len <= list_size) {
                memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
                memcpy(list + prefix_len, name, name_len);
                list[prefix_len + name_len] = '\0';
        }
        return total_len;
}

static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
                                   void *buffer, size_t size)
{
        if (strcmp(name, "") == 0)
                return -EINVAL;
        return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
                               buffer, size);
}

static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
                                   const void *value, size_t size, int flags)
{
        if (strcmp(name, "") == 0)
                return -EINVAL;

        return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
                               size, flags);
}

struct xattr_handler ocfs2_xattr_trusted_handler = {
        .prefix = XATTR_TRUSTED_PREFIX,
        .list   = ocfs2_xattr_trusted_list,
        .get    = ocfs2_xattr_trusted_get,
        .set    = ocfs2_xattr_trusted_set,
};


/*
 * 'user' attributes support
 */

#define XATTR_USER_PREFIX "user."

static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
                                    size_t list_size, const char *name,
                                    size_t name_len)
{
        const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1;
        const size_t total_len = prefix_len + name_len + 1;
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

        if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
                return 0;

        if (list && total_len <= list_size) {
                memcpy(list, XATTR_USER_PREFIX, prefix_len);
                memcpy(list + prefix_len, name, name_len);
                list[prefix_len + name_len] = '\0';
        }
        return total_len;
}

static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
                                void *buffer, size_t size)
{
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

        if (strcmp(name, "") == 0)
                return -EINVAL;
        if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
                return -EOPNOTSUPP;
        return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
                               buffer, size);
}

static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
                                const void *value, size_t size, int flags)
{
        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);

        if (strcmp(name, "") == 0)
                return -EINVAL;
        if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
                return -EOPNOTSUPP;

        return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
                               size, flags);
}

struct xattr_handler ocfs2_xattr_user_handler = {
        .prefix = XATTR_USER_PREFIX,
        .list   = ocfs2_xattr_user_list,
        .get    = ocfs2_xattr_user_get,
        .set    = ocfs2_xattr_user_set,
};

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