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Ext3: use unlikely to improve the efficiency of the kernel

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

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Wang Shilong 2013-01-12 01:36:17 -08:00 • committed by Jan Kara
parent 2b0542a4a0
commit 1b7d76e9b1
3 changed files with 7 additions and 7 deletions
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6
fs/ext3/inode.c
View file

@ -1082,7 +1082,7 @@ struct buffer_head *ext3_getblk(handle_t *handle, struct inode *inode,
if (!err && buffer_mapped(&dummy)) {
struct buffer_head *bh;
bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
if (!bh) {
if (unlikely(!bh)) {
*errp = -EIO;
goto err;
}
@ -2733,7 +2733,7 @@ static int __ext3_get_inode_loc(struct inode *inode,
return -EIO;
bh = sb_getblk(inode->i_sb, block);
if (!bh) {
if (unlikely(!bh)) {
ext3_error (inode->i_sb, "ext3_get_inode_loc",
"unable to read inode block - "
"inode=%lu, block="E3FSBLK,
@ -2787,7 +2787,7 @@ static int __ext3_get_inode_loc(struct inode *inode,
bitmap_bh = sb_getblk(inode->i_sb,
le32_to_cpu(desc->bg_inode_bitmap));
if (!bitmap_bh)
if (unlikely(!bitmap_bh))
goto make_io;
/*