1 files changed, 204 insertions, 168 deletions

diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 802c41492214..054e2efb0b7e 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -3,25 +3,20 @@
  *
  * xattr.c
  *
- * Copyright (C) 2008 Oracle.  All rights reserved.
+ * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
  *
  * CREDITS:
- * Lots of code in this file is taken from ext3.
+ * 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 as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * 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.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
  */
 
 #include <linux/capability.h>
@@ -83,7 +78,7 @@ struct xattr_handler *ocfs2_xattr_handlers[] = {
         NULL
 };
 
-static struct xattr_handler *ocfs2_xattr_handler_map[] = {
+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,
 };
@@ -116,6 +111,10 @@ static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
                                              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,
@@ -137,6 +136,24 @@ static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
 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;
@@ -542,14 +559,12 @@ static int ocfs2_xattr_block_list(struct inode *inode,
                 mlog_errno(ret);
                 return ret;
         }
-        /*Verify the signature of xattr block*/
-        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
-                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
-                ret = -EFAULT;
-                goto cleanup;
-        }
 
         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+        if (!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;
@@ -749,47 +764,25 @@ static int ocfs2_xattr_block_get(struct inode *inode,
                                  size_t buffer_size,
                                  struct ocfs2_xattr_search *xs)
 {
-        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
-        struct buffer_head *blk_bh = NULL;
         struct ocfs2_xattr_block *xb;
         struct ocfs2_xattr_value_root *xv;
         size_t size;
         int ret = -ENODATA, name_offset, name_len, block_off, i;
 
-        if (!di->i_xattr_loc)
-                return ret;
-
         memset(&xs->bucket, 0, sizeof(xs->bucket));
 
-        ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
-        if (ret < 0) {
+        ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
+        if (ret) {
                 mlog_errno(ret);
-                return ret;
-        }
-        /*Verify the signature of xattr block*/
-        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
-                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
-                ret = -EFAULT;
                 goto cleanup;
         }
 
-        xs->xattr_bh = blk_bh;
-        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
-
-        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
-                xs->header = &xb->xb_attrs.xb_header;
-                xs->base = (void *)xs->header;
-                xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
-                xs->here = xs->header->xh_entries;
-
-                ret = ocfs2_xattr_find_entry(name_index, name, xs);
-        } else
-                ret = ocfs2_xattr_index_block_find(inode, blk_bh,
-                                                   name_index,
-                                                   name, xs);
-
-        if (ret)
+        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;
@@ -828,7 +821,8 @@ cleanup:
                 brelse(xs->bucket.bhs[i]);
         memset(&xs->bucket, 0, sizeof(xs->bucket));
 
-        brelse(blk_bh);
+        brelse(xs->xattr_bh);
+        xs->xattr_bh = NULL;
         return ret;
 }
 
@@ -837,11 +831,11 @@ cleanup:
  * 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)
+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;
@@ -871,7 +865,7 @@ int ocfs2_xattr_get(struct inode *inode,
         down_read(&oi->ip_xattr_sem);
         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
                                     buffer_size, &xis);
-        if (ret == -ENODATA)
+        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);
@@ -1229,7 +1223,7 @@ static int ocfs2_xattr_set_entry(struct inode *inode,
 
         free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
         if (free < 0)
-                return -EFAULT;
+                return -EIO;
 
         if (!xs->not_found) {
                 size_t size = 0;
@@ -1514,10 +1508,9 @@ static int ocfs2_xattr_free_block(struct inode *inode,
                 goto out;
         }
 
-        /*Verify the signature of xattr block*/
-        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
-                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
-                ret = -EFAULT;
+        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+        if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
+                ret = -EIO;
                 goto out;
         }
 
@@ -1527,7 +1520,6 @@ static int ocfs2_xattr_free_block(struct inode *inode,
                 goto out;
         }
 
-        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
         blk = le64_to_cpu(xb->xb_blkno);
         bit = le16_to_cpu(xb->xb_suballoc_bit);
         bg_blkno = ocfs2_which_suballoc_group(blk, bit);
@@ -1771,15 +1763,14 @@ static int ocfs2_xattr_block_find(struct inode *inode,
                 mlog_errno(ret);
                 return ret;
         }
-        /*Verify the signature of xattr block*/
-        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
-                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
-                        ret = -EFAULT;
-                        goto cleanup;
+
+        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+        if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
+                ret = -EIO;
+                goto cleanup;
         }
 
         xs->xattr_bh = blk_bh;
-        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 
         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
                 xs->header = &xb->xb_attrs.xb_header;
@@ -1806,52 +1797,6 @@ cleanup:
 }
 
 /*
- * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
- * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
- * re-initialized.
- */
-static int ocfs2_restore_xattr_block(struct inode *inode,
-                                     struct ocfs2_xattr_search *xs)
-{
-        int ret;
-        handle_t *handle;
-        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
-        struct ocfs2_xattr_block *xb =
-                (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
-        struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
-        u16 xb_flags = le16_to_cpu(xb->xb_flags);
-
-        BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
-                le16_to_cpu(el->l_next_free_rec) != 0);
-
-        handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
-        if (IS_ERR(handle)) {
-                ret = PTR_ERR(handle);
-                handle = NULL;
-                goto out;
-        }
-
-        ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
-                                   OCFS2_JOURNAL_ACCESS_WRITE);
-        if (ret < 0) {
-                mlog_errno(ret);
-                goto out_commit;
-        }
-
-        memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
-               offsetof(struct ocfs2_xattr_block, xb_attrs));
-
-        xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);
-
-        ocfs2_journal_dirty(handle, xs->xattr_bh);
-
-out_commit:
-        ocfs2_commit_trans(osb, handle);
-out:
-        return ret;
-}
-
-/*
  * ocfs2_xattr_block_set()
  *
  * Set, replace or remove an extended attribute into external block.
@@ -1961,8 +1906,6 @@ out:
         }
 
         ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
-        if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
-                ret = ocfs2_restore_xattr_block(inode, xs);
 
 end:
 
@@ -2398,7 +2341,8 @@ static int ocfs2_xattr_index_block_find(struct inode *inode,
         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
 
         mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
-             "in the rec is %u\n", num_clusters, p_blkno, first_hash);
+             "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);
@@ -2422,7 +2366,7 @@ static int ocfs2_iterate_xattr_buckets(struct inode *inode,
         memset(&bucket, 0, sizeof(bucket));
 
         mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
-             clusters, blkno);
+             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,
@@ -2440,7 +2384,8 @@ static int ocfs2_iterate_xattr_buckets(struct inode *inode,
                 if (i == 0)
                         num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
 
-                mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno,
+                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);
@@ -2776,7 +2721,8 @@ static int ocfs2_xattr_create_index_block(struct inode *inode,
          */
         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
 
-        mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
+        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) {
@@ -2818,7 +2764,11 @@ static int ocfs2_xattr_create_index_block(struct inode *inode,
         if (data_bh)
                 ocfs2_journal_dirty(handle, data_bh);
 
-        ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_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 -
@@ -2941,8 +2891,8 @@ static int ocfs2_defrag_xattr_bucket(struct inode *inode,
 
         mlog(0, "adjust xattr bucket in %llu, count = %u, "
              "xh_free_start = %u, xh_name_value_len = %u.\n",
-             blkno, le16_to_cpu(xh->xh_count), xh_free_start,
-             le16_to_cpu(xh->xh_name_value_len));
+             (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.
@@ -3058,7 +3008,7 @@ static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
         prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
 
         mlog(0, "move half of xattrs in cluster %llu to %llu\n",
-             prev_blkno, new_blkno);
+             (unsigned long long)prev_blkno, (unsigned long long)new_blkno);
 
         /*
          * We need to update the 1st half of the new cluster and
@@ -3168,26 +3118,74 @@ static int ocfs2_read_xattr_bucket(struct inode *inode,
 }
 
 /*
- * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
+ * Find the suitable pos when we divide a bucket into 2.
+ * We have to make sure the xattrs with the same hash value exist
+ * in the same bucket.
+ *
+ * If this ocfs2_xattr_header covers more than one hash value, find a
+ * place where the hash value changes.  Try to find the most even split.
+ * The most common case is that all entries have different hash values,
+ * and the first check we make will find a place to split.
+ */
+static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
+{
+        struct ocfs2_xattr_entry *entries = xh->xh_entries;
+        int count = le16_to_cpu(xh->xh_count);
+        int delta, middle = count / 2;
+
+        /*
+         * We start at the middle.  Each step gets farther away in both
+         * directions.  We therefore hit the change in hash value
+         * nearest to the middle.  Note that this loop does not execute for
+         * count < 2.
+         */
+        for (delta = 0; delta < middle; delta++) {
+                /* Let's check delta earlier than middle */
+                if (cmp_xe(&entries[middle - delta - 1],
+                           &entries[middle - delta]))
+                        return middle - delta;
+
+                /* For even counts, don't walk off the end */
+                if ((middle + delta + 1) == count)
+                        continue;
+
+                /* Now try delta past middle */
+                if (cmp_xe(&entries[middle + delta],
+                           &entries[middle + delta + 1]))
+                        return middle + delta + 1;
+        }
+
+        /* Every entry had the same hash */
+        return count;
+}
+
+/*
+ * Move some xattrs in old bucket(blk) to new bucket(new_blk).
  * first_hash will record the 1st hash of the new bucket.
+ *
+ * Normally half of the xattrs will be moved.  But we have to make
+ * sure that the xattrs with the same hash value are stored in the
+ * same bucket. If all the xattrs in this bucket have the same hash
+ * value, the new bucket will be initialized as an empty one and the
+ * first_hash will be initialized as (hash_value+1).
  */
-static int ocfs2_half_xattr_bucket(struct inode *inode,
-                                   handle_t *handle,
-                                   u64 blk,
-                                   u64 new_blk,
-                                   u32 *first_hash,
-                                   int new_bucket_head)
+static int ocfs2_divide_xattr_bucket(struct inode *inode,
+                                    handle_t *handle,
+                                    u64 blk,
+                                    u64 new_blk,
+                                    u32 *first_hash,
+                                    int new_bucket_head)
 {
         int ret, i;
-        u16 count, start, len, name_value_len, xe_len, name_offset;
+        int count, start, len, name_value_len = 0, xe_len, name_offset = 0;
         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
         struct buffer_head **s_bhs, **t_bhs = NULL;
         struct ocfs2_xattr_header *xh;
         struct ocfs2_xattr_entry *xe;
         int blocksize = inode->i_sb->s_blocksize;
 
-        mlog(0, "move half of xattrs from bucket %llu to %llu\n",
-             blk, new_blk);
+        mlog(0, "move some of xattrs from bucket %llu to %llu\n",
+             (unsigned long long)blk, (unsigned long long)new_blk);
 
         s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
         if (!s_bhs)
@@ -3220,21 +3218,44 @@ static int ocfs2_half_xattr_bucket(struct inode *inode,
 
         for (i = 0; i < blk_per_bucket; i++) {
                 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
-                                           OCFS2_JOURNAL_ACCESS_CREATE);
+                                           new_bucket_head ?
+                                           OCFS2_JOURNAL_ACCESS_CREATE :
+                                           OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
         }
 
+        xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
+        count = le16_to_cpu(xh->xh_count);
+        start = ocfs2_xattr_find_divide_pos(xh);
+
+        if (start == count) {
+                xe = &xh->xh_entries[start-1];
+
+                /*
+                 * initialized a new empty bucket here.
+                 * The hash value is set as one larger than
+                 * that of the last entry in the previous bucket.
+                 */
+                for (i = 0; i < blk_per_bucket; i++)
+                        memset(t_bhs[i]->b_data, 0, blocksize);
+
+                xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
+                xh->xh_free_start = cpu_to_le16(blocksize);
+                xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
+                le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
+
+                goto set_num_buckets;
+        }
+
         /* copy the whole bucket to the new first. */
         for (i = 0; i < blk_per_bucket; i++)
                 memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
 
         /* update the new bucket. */
         xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
-        count = le16_to_cpu(xh->xh_count);
-        start = count / 2;
 
         /*
          * Calculate the total name/value len and xh_free_start for
@@ -3291,6 +3312,7 @@ static int ocfs2_half_xattr_bucket(struct inode *inode,
                         xh->xh_free_start = xe->xe_name_offset;
         }
 
+set_num_buckets:
         /* set xh->xh_num_buckets for the new xh. */
         if (new_bucket_head)
                 xh->xh_num_buckets = cpu_to_le16(1);
@@ -3308,9 +3330,13 @@ static int ocfs2_half_xattr_bucket(struct inode *inode,
                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
 
         /*
-         * Now only update the 1st block of the old bucket.
-         * Please note that the entry has been sorted already above.
+         * Now only update the 1st block of the old bucket.  If we
+         * just added a new empty bucket, there is no need to modify
+         * it.
          */
+        if (start == count)
+                goto out;
+
         xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
         memset(&xh->xh_entries[start], 0,
                sizeof(struct ocfs2_xattr_entry) * (count - start));
@@ -3358,7 +3384,8 @@ static int ocfs2_cp_xattr_bucket(struct inode *inode,
         BUG_ON(s_blkno == t_blkno);
 
         mlog(0, "cp bucket %llu to %llu, target is %d\n",
-             s_blkno, t_blkno, t_is_new);
+             (unsigned long long)s_blkno, (unsigned long long)t_blkno,
+             t_is_new);
 
         s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
                         GFP_NOFS);
@@ -3382,6 +3409,8 @@ static int ocfs2_cp_xattr_bucket(struct inode *inode,
 
         for (i = 0; i < blk_per_bucket; i++) {
                 ret = ocfs2_journal_access(handle, inode, t_bhs[i],
+                                           t_is_new ?
+                                           OCFS2_JOURNAL_ACCESS_CREATE :
                                            OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret)
                         goto out;
@@ -3428,7 +3457,8 @@ static int ocfs2_cp_xattr_cluster(struct inode *inode,
         struct ocfs2_xattr_header *xh;
         u64 to_blk_start = to_blk;
 
-        mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
+        mlog(0, "cp xattrs from cluster %llu to %llu\n",
+             (unsigned long long)src_blk, (unsigned long long)to_blk);
 
         /*
          * We need to update the new cluster and 1 more for the update of
@@ -3493,15 +3523,15 @@ out:
 }
 
 /*
- * Move half of the xattrs in this cluster to the new cluster.
+ * Move some xattrs in this cluster to the new cluster.
  * This function should only be called when bucket size == cluster size.
  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
  */
-static int ocfs2_half_xattr_cluster(struct inode *inode,
-                                    handle_t *handle,
-                                    u64 prev_blk,
-                                    u64 new_blk,
-                                    u32 *first_hash)
+static int ocfs2_divide_xattr_cluster(struct inode *inode,
+                                      handle_t *handle,
+                                      u64 prev_blk,
+                                      u64 new_blk,
+                                      u32 *first_hash)
 {
         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
         int ret, credits = 2 * blk_per_bucket;
@@ -3515,8 +3545,8 @@ static int ocfs2_half_xattr_cluster(struct inode *inode,
         }
 
         /* Move half of the xattr in start_blk to the next bucket. */
-        return  ocfs2_half_xattr_bucket(inode, handle, prev_blk,
-                                        new_blk, first_hash, 1);
+        return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
+                                          new_blk, first_hash, 1);
 }
 
 /*
@@ -3559,7 +3589,8 @@ static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
         int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
 
         mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
-             prev_blk, prev_clusters, new_blk);
+             (unsigned long long)prev_blk, prev_clusters,
+             (unsigned long long)new_blk);
 
         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
@@ -3578,9 +3609,9 @@ static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
                                                      last_blk, new_blk,
                                                      v_start);
                 else {
-                        ret = ocfs2_half_xattr_cluster(inode, handle,
-                                                       last_blk, new_blk,
-                                                       v_start);
+                        ret = ocfs2_divide_xattr_cluster(inode, handle,
+                                                         last_blk, new_blk,
+                                                         v_start);
 
                         if ((*header_bh)->b_blocknr == last_blk && extend)
                                 *extend = 0;
@@ -3629,7 +3660,7 @@ static int ocfs2_add_new_xattr_cluster(struct inode *inode,
         mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
              "previous xattr blkno = %llu\n",
              (unsigned long long)OCFS2_I(inode)->ip_blkno,
-             prev_cpos, prev_blkno);
+             prev_cpos, (unsigned long long)prev_blkno);
 
         ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
 
@@ -3716,7 +3747,7 @@ static int ocfs2_add_new_xattr_cluster(struct inode *inode,
                 }
         }
         mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
-             num_bits, block, v_start);
+             num_bits, (unsigned long long)block, v_start);
         ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
                                   num_bits, 0, meta_ac);
         if (ret < 0) {
@@ -3761,7 +3792,7 @@ static int ocfs2_extend_xattr_bucket(struct inode *inode,
         u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
 
         mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
-             "from %llu, len = %u\n", start_blk,
+             "from %llu, len = %u\n", (unsigned long long)start_blk,
              (unsigned long long)first_bh->b_blocknr, num_clusters);
 
         BUG_ON(bucket >= num_buckets);
@@ -3797,8 +3828,8 @@ static int ocfs2_extend_xattr_bucket(struct inode *inode,
         }
 
         /* Move half of the xattr in start_blk to the next bucket. */
-        ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
-                                      start_blk + blk_per_bucket, NULL, 0);
+        ret = ocfs2_divide_xattr_bucket(inode, handle, start_blk,
+                                        start_blk + blk_per_bucket, NULL, 0);
 
         le16_add_cpu(&first_xh->xh_num_buckets, 1);
         ocfs2_journal_dirty(handle, first_bh);
@@ -4146,7 +4177,7 @@ static int ocfs2_xattr_value_update_size(struct inode *inode,
         handle_t *handle = NULL;
 
         handle = ocfs2_start_trans(osb, 1);
-        if (handle == NULL) {
+        if (IS_ERR(handle)) {
                 ret = -ENOMEM;
                 mlog_errno(ret);
                 goto out;
@@ -4313,7 +4344,7 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
         }
 
         handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
-        if (handle == NULL) {
+        if (IS_ERR(handle)) {
                 ret = -ENOMEM;
                 mlog_errno(ret);
                 goto out;
@@ -4489,11 +4520,21 @@ out:
         return ret;
 }
 
-/* check whether the xattr bucket is filled up with the same hash value. */
+/*
+ * check whether the xattr bucket is filled up with the same hash value.
+ * If we want to insert the xattr with the same hash, return -ENOSPC.
+ * If we want to insert a xattr with different hash value, go ahead
+ * and ocfs2_divide_xattr_bucket will handle this.
+ */
 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
-                                              struct ocfs2_xattr_bucket *bucket)
+                                              struct ocfs2_xattr_bucket *bucket,
+                                              const char *name)
 {
         struct ocfs2_xattr_header *xh = bucket->xh;
+        u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
+
+        if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
+                return 0;
 
         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
             xh->xh_entries[0].xe_name_hash) {
@@ -4616,7 +4657,9 @@ try_again:
                  * one bucket's worth, so check it here whether we need to
                  * add a new bucket for the insert.
                  */
-                ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
+                ret = ocfs2_check_xattr_bucket_collision(inode,
+                                                         &xs->bucket,
+                                                         xi->name);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -4727,14 +4770,11 @@ out:
 /*
  * 'trusted' attributes support
  */
-
-#define XATTR_TRUSTED_PREFIX "trusted."
-
 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
                                        size_t list_size, const char *name,
                                        size_t name_len)
 {
-        const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX) - 1;
+        const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
         const size_t total_len = prefix_len + name_len + 1;
 
         if (list && total_len <= list_size) {
@@ -4771,18 +4811,14 @@ struct xattr_handler ocfs2_xattr_trusted_handler = {
         .set    = ocfs2_xattr_trusted_set,
 };
 
-
 /*
  * 'user' attributes support
  */
-
-#define XATTR_USER_PREFIX "user."
-
 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
                                     size_t list_size, const char *name,
                                     size_t name_len)
 {
-        const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1;
+        const size_t prefix_len = XATTR_USER_PREFIX_LEN;
         const size_t total_len = prefix_len + name_len + 1;
         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);