Commit 2b0542a4 authored Jan 12, 2013 by Wang Shilong Committed by Jan Kara Jan 21, 2013

Ext2: 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: Jan Kara <jack@suse.cz>

parent 61f43e68

fs/ext2/super.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1500,7 +1500,7 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type,
		bh = sb_bread(sb, tmp_bh.b_blocknr);
		else
		bh = sb_getblk(sb, tmp_bh.b_blocknr);
		if (!bh) {
		if (unlikely(!bh)) {
		err = -EIO;
		goto out;
		}

fs/ext2/xattr.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -662,7 +662,7 @@ ext2_xattr_set2(struct inode inode, struct buffer_head old_bh,
		ea_idebug(inode, "creating block %d", block);

		new_bh = sb_getblk(sb, block);
		if (!new_bh) {
		if (unlikely(!new_bh)) {
		ext2_free_blocks(inode, block, 1);
		mark_inode_dirty(inode);
		error = -EIO;