From 7d3c788cf8367fb1f23cdb05aa99726e52657761 Mon Sep 17 00:00:00 2001 From: Ashish Sangwan Date: Tue, 18 Jun 2013 11:28:45 -0400 Subject: [PATCH] ext4: optimize starting extent in ext4_ext_rm_leaf() Both hole punch and truncate use ext4_ext_rm_leaf() for removing blocks. Currently we choose the last extent as the starting point for removing blocks: ex = EXT_LAST_EXTENT(eh); This is OK for truncate but for hole punch we can optimize the extent selection as the path is already initialized. We could use this information to select proper starting extent. The code change in this patch will not affect truncate as for truncate path[depth].p_ext will always be NULL. Signed-off-by: Ashish Sangwan Signed-off-by: Namjae Jeon Signed-off-by: "Theodore Ts'o" --- fs/ext4/extents.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 937593e2f006..6935bbcc78e2 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -2504,7 +2504,9 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode, return -EIO; } /* find where to start removing */ - ex = EXT_LAST_EXTENT(eh); + ex = path[depth].p_ext; + if (!ex) + ex = EXT_LAST_EXTENT(eh); ex_ee_block = le32_to_cpu(ex->ee_block); ex_ee_len = ext4_ext_get_actual_len(ex); -- 2.39.5