/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * xattr.c
 *
 * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
 *
 * CREDITS:
 * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License version 2 as published by the Free Software Foundation.
 *
 * 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.
 */

#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_MAX] = {
        [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_block_find(struct inode *inode,
                                  int name_index,
                                  const char *name,
                                  struct ocfs2_xattr_search *xs);
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 u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
{
        return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
}

static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
{
        return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
}

static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
{
        u16 len = sb->s_blocksize -
                 offsetof(struct ocfs2_xattr_header, xh_entries);

        return len / sizeof(struct ocfs2_xattr_entry);
}

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;
        }

        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
        if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
                ret = -EIO;
                goto cleanup;
        }

        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_xattr_block *xb;
        struct ocfs2_xattr_value_root *xv;
        size_t size;
        int ret = -ENODATA, name_offset, name_len, block_off, i;

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

        ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
        if (ret) {
                mlog_errno(ret);
                goto cleanup;
        }

        if (xs->not_found) {
                ret = -ENODATA;
                goto cleanup;
        }

        xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
        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(xs->xattr_bh);
        xs->xattr_bh = NULL;
        return ret;
}

/* ocfs2_xattr_get()
 *
 * Copy an extended attribute into the buffer provided.
 * Buffer is NULL to compute the size of buffer required.
 */
static 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 && di->i_xattr_loc)
                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 -EIO;

        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;
        }

        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
        if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
                ret = -EIO;
                goto out;
        }

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

        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;
        }

        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
        if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
                ret = -EIO;
                goto cleanup;
        }

        xs->xattr_bh = blk_bh;

        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;
}

/*
 * 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);

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, (unsigned long long)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, (unsigned long long)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",
                     (unsigned long long)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",
             (unsigned long long)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);

        ret = ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
        if (ret) {
                mlog_errno(ret);
                goto out_commit;
        }

        /* 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",
             (unsigned long long)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);