ocfs2: Add extended attribute support

This patch implements storing extended attributes both in inode or a single
external block. We only store EA's in-inode when blocksize > 512 or that
inode block has free space for it. When an EA's value is larger than 80
bytes, we will store the value via b-tree outside inode or block.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 1620 insertions, 0 deletions

diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 9604a4cd02bb..67bebd9259e7 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -5,6 +5,9 @@
  *
  * Copyright (C) 2008 Oracle.  All rights reserved.
  *
+ * CREDITS:
+ * Lots of code in this file is taken from ext3.
+ *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
  * License as published by the Free Software Foundation; either
@@ -21,6 +24,19 @@
  * Boston, MA 021110-1307, USA.
  */
 
+#include <linux/capability.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/uio.h>
+#include <linux/sched.h>
+#include <linux/splice.h>
+#include <linux/mount.h>
+#include <linux/writeback.h>
+#include <linux/falloc.h>
+
 #define MLOG_MASK_PREFIX ML_XATTR
 #include <cluster/masklog.h>
 
@@ -28,12 +44,119 @@
 #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 "xattr.h"
+
+
+struct ocfs2_xattr_def_value_root {
+        struct ocfs2_xattr_value_root   xv;
+        struct ocfs2_extent_rec         er;
+};
+
+#define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
+#define OCFS2_XATTR_INLINE_SIZE 80
+
+static struct ocfs2_xattr_def_value_root def_xv = {
+        .xv.xr_list.l_count = cpu_to_le16(1),
+};
+
+struct xattr_handler *ocfs2_xattr_handlers[] = {
+        &ocfs2_xattr_user_handler,
+        &ocfs2_xattr_trusted_handler,
+        NULL
+};
+
+static struct xattr_handler *ocfs2_xattr_handler_map[] = {
+        [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
+        [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
+};
+
+struct ocfs2_xattr_info {
+        int name_index;
+        const char *name;
+        const void *value;
+        size_t value_len;
+};
+
+struct ocfs2_xattr_search {
+        struct buffer_head *inode_bh;
+        /*
+         * xattr_bh point to the block buffer head which has extended attribute
+         * when extended attribute in inode, xattr_bh is equal to inode_bh.
+         */
+        struct buffer_head *xattr_bh;
+        struct ocfs2_xattr_header *header;
+        void *base;
+        void *end;
+        struct ocfs2_xattr_entry *here;
+        int not_found;
+};
+
+static inline struct xattr_handler *ocfs2_xattr_handler(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;
+}
+
+static inline u32 ocfs2_xattr_name_hash(struct inode *inode,
+                                        char *prefix,
+                                        int prefix_len,
+                                        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 prefix */
+        for (i = 0; i < prefix_len; i++) {
+                hash = (hash << OCFS2_HASH_SHIFT) ^
+                       (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
+                       *prefix++;
+        }
+        /* 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;
+        struct xattr_handler *handler =
+                        ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
+        char *prefix = handler->prefix;
+        char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
+        int prefix_len = strlen(handler->prefix);
+
+        hash = ocfs2_xattr_name_hash(inode, prefix, prefix_len, 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,
@@ -303,3 +426,1500 @@ static int ocfs2_xattr_value_truncate(struct inode *inode,
 
         return ret;
 }
+
+static int ocfs2_xattr_list_entries(struct inode *inode,
+                                    struct ocfs2_xattr_header *header,
+                                    char *buffer, size_t buffer_size)
+{
+        size_t rest = buffer_size;
+        int i;
+
+        for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
+                struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
+                struct xattr_handler *handler =
+                        ocfs2_xattr_handler(ocfs2_xattr_get_type(entry));
+
+                if (handler) {
+                        size_t size = handler->list(inode, buffer, rest,
+                                        ((char *)header +
+                                        le16_to_cpu(entry->xe_name_offset)),
+                                        entry->xe_name_len);
+                        if (buffer) {
+                                if (size > rest)
+                                        return -ERANGE;
+                                buffer += size;
+                        }
+                        rest -= size;
+                }
+        }
+
+        return buffer_size - rest;
+}
+
+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_header *header = NULL;
+        int ret = 0;
+
+        if (!di->i_xattr_loc)
+                return ret;
+
+        ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
+                               le64_to_cpu(di->i_xattr_loc),
+                               &blk_bh, OCFS2_BH_CACHED, inode);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        /*Verify the signature of xattr block*/
+        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
+                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
+                ret = -EFAULT;
+                goto cleanup;
+        }
+
+        header = &((struct ocfs2_xattr_block *)blk_bh->b_data)->
+                 xb_attrs.xb_header;
+
+        ret = ocfs2_xattr_list_entries(inode, header, 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 (!(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_search *xs,
+                                         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_xattr_value_root *xv;
+        struct ocfs2_extent_list *el;
+
+        xv = (struct ocfs2_xattr_value_root *)
+                (xs->base + le16_to_cpu(xs->here->xe_name_offset) +
+                OCFS2_XATTR_SIZE(xs->here->xe_name_len));
+        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(OCFS2_SB(inode->i_sb), blkno,
+                                               &bh, OCFS2_BH_CACHED, inode);
+                        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;
+        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 {
+                        ret = ocfs2_xattr_get_value_outside(inode, xs,
+                                                            buffer, size);
+                        if (ret < 0) {
+                                mlog_errno(ret);
+                                return ret;
+                        }
+                }
+        }
+
+        return size;
+}
+
+static int ocfs2_xattr_block_get(struct inode *inode,
+                                 int name_index,
+                                 const char *name,
+                                 void *buffer,
+                                 size_t buffer_size,
+                                 struct ocfs2_xattr_search *xs)
+{
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
+        struct buffer_head *blk_bh = NULL;
+        struct ocfs2_xattr_block *xb;
+        size_t size;
+        int ret = -ENODATA;
+
+        if (!di->i_xattr_loc)
+                return ret;
+
+        ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
+                               le64_to_cpu(di->i_xattr_loc),
+                               &blk_bh, OCFS2_BH_CACHED, inode);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        /*Verify the signature of xattr block*/
+        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
+                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
+                ret = -EFAULT;
+                goto cleanup;
+        }
+
+        xs->xattr_bh = blk_bh;
+        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+        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);
+        if (ret)
+                goto cleanup;
+        size = le64_to_cpu(xs->here->xe_value_size);
+        if (buffer) {
+                ret = -ERANGE;
+                if (size > buffer_size)
+                        goto cleanup;
+                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 {
+                        ret = ocfs2_xattr_get_value_outside(inode, xs,
+                                                            buffer, size);
+                        if (ret < 0) {
+                                mlog_errno(ret);
+                                goto cleanup;
+                        }
+                }
+        }
+        ret = size;
+cleanup:
+        brelse(blk_bh);
+
+        return ret;
+}
+
+/* ocfs2_xattr_get()
+ *
+ * Copy an extended attribute into the buffer provided.
+ * Buffer is NULL to compute the size of buffer required.
+ */
+int ocfs2_xattr_get(struct inode *inode,
+                    int name_index,
+                    const char *name,
+                    void *buffer,
+                    size_t buffer_size)
+{
+        int ret;
+        struct ocfs2_dinode *di = NULL;
+        struct buffer_head *di_bh = NULL;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_xattr_search xis = {
+                .not_found = -ENODATA,
+        };
+        struct ocfs2_xattr_search xbs = {
+                .not_found = -ENODATA,
+        };
+
+        if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
+                ret = -ENODATA;
+
+        ret = ocfs2_inode_lock(inode, &di_bh, 0);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        xis.inode_bh = xbs.inode_bh = di_bh;
+        di = (struct ocfs2_dinode *)di_bh->b_data;
+
+        down_read(&oi->ip_xattr_sem);
+        ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
+                                    buffer_size, &xis);
+        if (ret == -ENODATA)
+                ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
+                                            buffer_size, &xbs);
+        up_read(&oi->ip_xattr_sem);
+        ocfs2_inode_unlock(inode, 0);
+
+        brelse(di_bh);
+
+        return ret;
+}
+
+static int __ocfs2_xattr_set_value_outside(struct inode *inode,
+                                           struct ocfs2_xattr_value_root *xv,
+                                           const void *value,
+                                           int value_len)
+{
+        int ret = 0, i, cp_len, credits;
+        u16 blocksize = inode->i_sb->s_blocksize;
+        u32 p_cluster, num_clusters;
+        u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
+        u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
+        u64 blkno;
+        struct buffer_head *bh = NULL;
+        handle_t *handle;
+
+        BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
+
+        credits = clusters * bpc;
+        handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        while (cpos < clusters) {
+                ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
+                                               &num_clusters, &xv->xr_list);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+
+                blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
+
+                for (i = 0; i < num_clusters * bpc; i++, blkno++) {
+                        ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
+                                               &bh, OCFS2_BH_CACHED, inode);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out_commit;
+                        }
+
+                        ret = ocfs2_journal_access(handle,
+                                                   inode,
+                                                   bh,
+                                                   OCFS2_JOURNAL_ACCESS_WRITE);
+                        if (ret < 0) {
+                                mlog_errno(ret);
+                                goto out_commit;
+                        }
+
+                        cp_len = value_len > blocksize ? blocksize : value_len;
+                        memcpy(bh->b_data, value, cp_len);
+                        value_len -= cp_len;
+                        value += cp_len;
+                        if (cp_len < blocksize)
+                                memset(bh->b_data + cp_len, 0,
+                                       blocksize - cp_len);
+
+                        ret = ocfs2_journal_dirty(handle, bh);
+                        if (ret < 0) {
+                                mlog_errno(ret);
+                                goto out_commit;
+                        }
+                        brelse(bh);
+                        bh = NULL;
+
+                        /*
+                         * XXX: do we need to empty all the following
+                         * blocks in this cluster?
+                         */
+                        if (!value_len)
+                                break;
+                }
+                cpos += num_clusters;
+        }
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+out:
+        brelse(bh);
+
+        return ret;
+}
+
+static int ocfs2_xattr_cleanup(struct inode *inode,
+                               struct ocfs2_xattr_info *xi,
+                               struct ocfs2_xattr_search *xs,
+                               size_t offs)
+{
+        handle_t *handle = NULL;
+        int ret = 0;
+        size_t name_len = strlen(xi->name);
+        void *val = xs->base + offs;
+        size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
+
+        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
+                                   OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+        ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+        /* Decrease xattr count */
+        le16_add_cpu(&xs->header->xh_count, -1);
+        /* Remove the xattr entry and tree root which has already be set*/
+        memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
+        memset(val, 0, size);
+
+        ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
+        if (ret < 0)
+                mlog_errno(ret);
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+out:
+        return ret;
+}
+
+static int ocfs2_xattr_update_entry(struct inode *inode,
+                                    struct ocfs2_xattr_info *xi,
+                                    struct ocfs2_xattr_search *xs,
+                                    size_t offs)
+{
+        handle_t *handle = NULL;
+        int ret = 0;
+
+        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
+                                   OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+        ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        xs->here->xe_name_offset = cpu_to_le16(offs);
+        xs->here->xe_value_size = cpu_to_le64(xi->value_len);
+        if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
+                ocfs2_xattr_set_local(xs->here, 1);
+        else
+                ocfs2_xattr_set_local(xs->here, 0);
+        ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
+
+        ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
+        if (ret < 0)
+                mlog_errno(ret);
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+out:
+        return ret;
+}
+
+/*
+ * ocfs2_xattr_set_value_outside()
+ *
+ * Set large size value in B tree.
+ */
+static int ocfs2_xattr_set_value_outside(struct inode *inode,
+                                         struct ocfs2_xattr_info *xi,
+                                         struct ocfs2_xattr_search *xs,
+                                         size_t offs)
+{
+        size_t name_len = strlen(xi->name);
+        void *val = xs->base + offs;
+        struct ocfs2_xattr_value_root *xv = NULL;
+        size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
+        int ret = 0;
+
+        memset(val, 0, size);
+        memcpy(val, xi->name, name_len);
+        xv = (struct ocfs2_xattr_value_root *)
+                (val + OCFS2_XATTR_SIZE(name_len));
+        xv->xr_clusters = 0;
+        xv->xr_last_eb_blk = 0;
+        xv->xr_list.l_tree_depth = 0;
+        xv->xr_list.l_count = cpu_to_le16(1);
+        xv->xr_list.l_next_free_rec = 0;
+
+        ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
+                                         xi->value_len);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
+                                              xi->value_len);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
+        if (ret < 0)
+                mlog_errno(ret);
+
+        return ret;
+}
+
+/*
+ * ocfs2_xattr_set_entry_local()
+ *
+ * Set, replace or remove extended attribute in local.
+ */
+static void ocfs2_xattr_set_entry_local(struct inode *inode,
+                                        struct ocfs2_xattr_info *xi,
+                                        struct ocfs2_xattr_search *xs,
+                                        struct ocfs2_xattr_entry *last,
+                                        size_t min_offs)
+{
+        size_t name_len = strlen(xi->name);
+        int i;
+
+        if (xi->value && xs->not_found) {
+                /* Insert the new xattr entry. */
+                le16_add_cpu(&xs->header->xh_count, 1);
+                ocfs2_xattr_set_type(last, xi->name_index);
+                ocfs2_xattr_set_local(last, 1);
+                last->xe_name_len = name_len;
+        } else {
+                void *first_val;
+                void *val;
+                size_t offs, size;
+
+                first_val = xs->base + min_offs;
+                offs = le16_to_cpu(xs->here->xe_name_offset);
+                val = xs->base + offs;
+
+                if (le64_to_cpu(xs->here->xe_value_size) >
+                    OCFS2_XATTR_INLINE_SIZE)
+                        size = OCFS2_XATTR_SIZE(name_len) +
+                                OCFS2_XATTR_ROOT_SIZE;
+                else
+                        size = OCFS2_XATTR_SIZE(name_len) +
+                        OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
+
+                if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
+                                OCFS2_XATTR_SIZE(xi->value_len)) {
+                        /* The old and the new value have the
+                           same size. Just replace the value. */
+                        ocfs2_xattr_set_local(xs->here, 1);
+                        xs->here->xe_value_size = cpu_to_le64(xi->value_len);
+                        /* Clear value bytes. */
+                        memset(val + OCFS2_XATTR_SIZE(name_len),
+                               0,
+                               OCFS2_XATTR_SIZE(xi->value_len));
+                        memcpy(val + OCFS2_XATTR_SIZE(name_len),
+                               xi->value,
+                               xi->value_len);
+                        return;
+                }
+                /* Remove the old name+value. */
+                memmove(first_val + size, first_val, val - first_val);
+                memset(first_val, 0, size);
+                xs->here->xe_name_hash = 0;
+                xs->here->xe_name_offset = 0;
+                ocfs2_xattr_set_local(xs->here, 1);
+                xs->here->xe_value_size = 0;
+
+                min_offs += size;
+
+                /* Adjust all value offsets. */
+                last = xs->header->xh_entries;
+                for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
+                        size_t o = le16_to_cpu(last->xe_name_offset);
+
+                        if (o < offs)
+                                last->xe_name_offset = cpu_to_le16(o + size);
+                        last += 1;
+                }
+
+                if (!xi->value) {
+                        /* Remove the old entry. */
+                        last -= 1;
+                        memmove(xs->here, xs->here + 1,
+                                (void *)last - (void *)xs->here);
+                        memset(last, 0, sizeof(struct ocfs2_xattr_entry));
+                        le16_add_cpu(&xs->header->xh_count, -1);
+                }
+        }
+        if (xi->value) {
+                /* Insert the new name+value. */
+                size_t size = OCFS2_XATTR_SIZE(name_len) +
+                                OCFS2_XATTR_SIZE(xi->value_len);
+                void *val = xs->base + min_offs - size;
+
+                xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
+                memset(val, 0, size);
+                memcpy(val, xi->name, name_len);
+                memcpy(val + OCFS2_XATTR_SIZE(name_len),
+                       xi->value,
+                       xi->value_len);
+                xs->here->xe_value_size = cpu_to_le64(xi->value_len);
+                ocfs2_xattr_set_local(xs->here, 1);
+                ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
+        }
+
+        return;
+}
+
+/*
+ * ocfs2_xattr_set_entry()
+ *
+ * Set extended attribute entry into inode or block.
+ *
+ * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
+ * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
+ * then set value in B tree with set_value_outside().
+ */
+static int ocfs2_xattr_set_entry(struct inode *inode,
+                                 struct ocfs2_xattr_info *xi,
+                                 struct ocfs2_xattr_search *xs,
+                                 int flag)
+{
+        struct ocfs2_xattr_entry *last;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
+        size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
+        size_t size_l = 0;
+        handle_t *handle = NULL;
+        int free, i, ret;
+        struct ocfs2_xattr_info xi_l = {
+                .name_index = xi->name_index,
+                .name = xi->name,
+                .value = xi->value,
+                .value_len = xi->value_len,
+        };
+
+        /* Compute min_offs, last and free space. */
+        last = xs->header->xh_entries;
+
+        for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
+                size_t offs = le16_to_cpu(last->xe_name_offset);
+                if (offs < min_offs)
+                        min_offs = offs;
+                last += 1;
+        }
+
+        free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
+        if (free < 0)
+                return -EFAULT;
+
+        if (!xs->not_found) {
+                size_t size = 0;
+                if (ocfs2_xattr_is_local(xs->here))
+                        size = OCFS2_XATTR_SIZE(name_len) +
+                        OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
+                else
+                        size = OCFS2_XATTR_SIZE(name_len) +
+                                OCFS2_XATTR_ROOT_SIZE;
+                free += (size + sizeof(struct ocfs2_xattr_entry));
+        }
+        /* Check free space in inode or block */
+        if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
+                if (free < sizeof(struct ocfs2_xattr_entry) +
+                           OCFS2_XATTR_SIZE(name_len) +
+                           OCFS2_XATTR_ROOT_SIZE) {
+                        ret = -ENOSPC;
+                        goto out;
+                }
+                size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
+                xi_l.value = (void *)&def_xv;
+                xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
+        } else if (xi->value) {
+                if (free < sizeof(struct ocfs2_xattr_entry) +
+                           OCFS2_XATTR_SIZE(name_len) +
+                           OCFS2_XATTR_SIZE(xi->value_len)) {
+                        ret = -ENOSPC;
+                        goto out;
+                }
+        }
+
+        if (!xs->not_found) {
+                /* For existing extended attribute */
+                size_t size = OCFS2_XATTR_SIZE(name_len) +
+                        OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
+                size_t offs = le16_to_cpu(xs->here->xe_name_offset);
+                void *val = xs->base + offs;
+
+                if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
+                        /* Replace existing local xattr with tree root */
+                        ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
+                                                            offs);
+                        if (ret < 0)
+                                mlog_errno(ret);
+                        goto out;
+                } else if (!ocfs2_xattr_is_local(xs->here)) {
+                        /* For existing xattr which has value outside */
+                        struct ocfs2_xattr_value_root *xv = NULL;
+                        xv = (struct ocfs2_xattr_value_root *)(val +
+                                OCFS2_XATTR_SIZE(name_len));
+
+                        if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
+                                /*
+                                 * If new value need set outside also,
+                                 * first truncate old value to new value,
+                                 * then set new value with set_value_outside().
+                                 */
+                                ret = ocfs2_xattr_value_truncate(inode,
+                                                                 xs->xattr_bh,
+                                                                 xv,
+                                                                 xi->value_len);
+                                if (ret < 0) {
+                                        mlog_errno(ret);
+                                        goto out;
+                                }
+
+                                ret = __ocfs2_xattr_set_value_outside(inode,
+                                                                xv,
+                                                                xi->value,
+                                                                xi->value_len);
+                                if (ret < 0) {
+                                        mlog_errno(ret);
+                                        goto out;
+                                }
+
+                                ret = ocfs2_xattr_update_entry(inode,
+                                                               xi,
+                                                               xs,
+                                                               offs);
+                                if (ret < 0)
+                                        mlog_errno(ret);
+                                goto out;
+                        } else {
+                                /*
+                                 * If new value need set in local,
+                                 * just trucate old value to zero.
+                                 */
+                                 ret = ocfs2_xattr_value_truncate(inode,
+                                                                 xs->xattr_bh,
+                                                                 xv,
+                                                                 0);
+                                if (ret < 0)
+                                        mlog_errno(ret);
+                        }
+                }
+        }
+
+        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
+                                   OCFS2_INODE_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        if (!(flag & OCFS2_INLINE_XATTR_FL)) {
+                /*set extended attribue in external blcok*/
+                ret = ocfs2_extend_trans(handle,
+                                         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_xattr_free_block(handle_t *handle,
+                                  struct ocfs2_super *osb,
+                                  struct ocfs2_xattr_block *xb)
+{
+        struct inode *xb_alloc_inode;
+        struct buffer_head *xb_alloc_bh = NULL;
+        u64 blk = le64_to_cpu(xb->xb_blkno);
+        u16 bit = le16_to_cpu(xb->xb_suballoc_bit);
+        u64 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
+        int ret = 0;
+
+        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;
+        }
+        ret = ocfs2_extend_trans(handle, OCFS2_SUBALLOC_FREE);
+        if (ret < 0) {
+                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);
+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:
+        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;
+        struct ocfs2_xattr_header *header;
+        int ret = 0;
+
+        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+        header = &(xb->xb_attrs.xb_header);
+
+        ret = ocfs2_remove_value_outside(inode, blk_bh, header);
+
+        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_xattr_block *xb;
+        struct buffer_head *blk_bh = NULL;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        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 (!(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_read_block(OCFS2_SB(inode->i_sb),
+                                       le64_to_cpu(di->i_xattr_loc),
+                                       &blk_bh, OCFS2_BH_CACHED, inode);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        return ret;
+                }
+                /*Verify the signature of xattr block*/
+                if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
+                           strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
+                        ret = -EFAULT;
+                        goto out;
+                }
+
+                ret = ocfs2_xattr_block_remove(inode, blk_bh);
+                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;
+        }
+
+        if (di->i_xattr_loc) {
+                xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+                ocfs2_xattr_free_block(handle, osb, xb);
+                di->i_xattr_loc = cpu_to_le64(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:
+        brelse(blk_bh);
+
+        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;
+        int ret = 0;
+
+        if (!di->i_xattr_loc)
+                return ret;
+
+        ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
+                               le64_to_cpu(di->i_xattr_loc),
+                               &blk_bh, OCFS2_BH_CACHED, inode);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        /*Verify the signature of xattr block*/
+        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
+                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
+                        ret = -EFAULT;
+                        goto cleanup;
+        }
+
+        xs->xattr_bh = blk_bh;
+        xs->header = &((struct ocfs2_xattr_block *)blk_bh->b_data)->
+                        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);
+        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;
+        }
+
+        /* Set extended attribute into external block */
+        ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
+
+        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;
+
+        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,
+        };
+
+        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);
+
+        return ret;
+}
+