Ext3: 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 check it.
Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 6e4f8a5..d7df068 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1082,7 +1082,7 @@
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 @@
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 @@
bitmap_bh = sb_getblk(inode->i_sb,
le32_to_cpu(desc->bg_inode_bitmap));
- if (!bitmap_bh)
+ if (unlikely(!bitmap_bh))
goto make_io;
/*
diff --git a/fs/ext3/resize.c b/fs/ext3/resize.c
index 0f814f3..704e8ce 100644
--- a/fs/ext3/resize.c
+++ b/fs/ext3/resize.c
@@ -116,7 +116,7 @@
int err;
bh = sb_getblk(sb, blk);
- if (!bh)
+ if (unlikely(!bh))
return ERR_PTR(-EIO);
if ((err = ext3_journal_get_write_access(handle, bh))) {
brelse(bh);
@@ -234,7 +234,7 @@
goto exit_bh;
gdb = sb_getblk(sb, block);
- if (!gdb) {
+ if (unlikely(!gdb)) {
err = -EIO;
goto exit_bh;
}
@@ -722,7 +722,7 @@
break;
bh = sb_getblk(sb, group * bpg + blk_off);
- if (!bh) {
+ if (unlikely(!bh)) {
err = -EIO;
break;
}
diff --git a/fs/ext3/xattr.c b/fs/ext3/xattr.c
index d22ebb7..9f57470 100644
--- a/fs/ext3/xattr.c
+++ b/fs/ext3/xattr.c
@@ -813,7 +813,7 @@
ea_idebug(inode, "creating block %d", block);
new_bh = sb_getblk(sb, block);
- if (!new_bh) {
+ if (unlikely(!new_bh)) {
getblk_failed:
ext3_free_blocks(handle, inode, block, 1);
error = -EIO;