From 1b7d76e9b1106f2be062f915b05d47658dd4fc63 Mon Sep 17 00:00:00 2001 From: Wang Shilong Date: Sat, 12 Jan 2013 01:36:17 -0800 Subject: 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 Signed-off-by: Jan Kara --- fs/ext3/inode.c | 6 +++--- fs/ext3/resize.c | 6 +++--- fs/ext3/xattr.c | 2 +- 3 files changed, 7 insertions(+), 7 deletions(-) (limited to 'fs/ext3') diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c index 6e4f8a529fbc..d7df06839f6a 100644 --- a/fs/ext3/inode.c +++ b/fs/ext3/inode.c @@ -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; /* diff --git a/fs/ext3/resize.c b/fs/ext3/resize.c index 0f814f3450de..704e8ce7d782 100644 --- a/fs/ext3/resize.c +++ b/fs/ext3/resize.c @@ -116,7 +116,7 @@ static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, 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 @@ static int setup_new_group_blocks(struct super_block *sb, goto exit_bh; gdb = sb_getblk(sb, block); - if (!gdb) { + if (unlikely(!gdb)) { err = -EIO; goto exit_bh; } @@ -722,7 +722,7 @@ static void update_backups(struct super_block *sb, 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 d22ebb7a4f55..9f57470b1727 100644 --- a/fs/ext3/xattr.c +++ b/fs/ext3/xattr.c @@ -813,7 +813,7 @@ inserted: 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; -- cgit v1.2.3-59-g8ed1b