ext4: use unlikely to improve the efficiency of the kernel

Because the function 'sb_getblk' seldomly fails to return NULL
value,it will be better to use 'unlikely' to optimize it.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9ccc140b82d2..93a7e8453a68 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -713,7 +713,7 @@ struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
                 return NULL;
 
         bh = sb_getblk(inode->i_sb, map.m_pblk);
-        if (!bh) {
+        if (unlikely(!bh)) {
                 *errp = -ENOMEM;
                 return NULL;
         }
@@ -3660,7 +3660,7 @@ static int __ext4_get_inode_loc(struct inode *inode,
         iloc->offset = (inode_offset % inodes_per_block) * EXT4_INODE_SIZE(sb);
 
         bh = sb_getblk(sb, block);
-        if (!bh)
+        if (unlikely(!bh))
                 return -ENOMEM;
         if (!buffer_uptodate(bh)) {
                 lock_buffer(bh);
@@ -3693,7 +3693,7 @@ static int __ext4_get_inode_loc(struct inode *inode,
 
                         /* Is the inode bitmap in cache? */
                         bitmap_bh = sb_getblk(sb, ext4_inode_bitmap(sb, gdp));
-                        if (!bitmap_bh)
+                        if (unlikely(!bitmap_bh))
                                 goto make_io;
 
                         /*