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authorKazuya Mio <k-mio@sx.jp.nec.com>2012-02-08 16:34:29 +0900
committerJan Kara <jack@suse.cz>2012-02-29 21:53:46 +0100
commitac1334bfdae33be17ae6ae641bbbd1e6a2f04005 (patch)
tree1d7beae4467acc1ba18a90d18b07eab5563c14de /fs/ext3/inode.c
parent053800a84b942511054b51299db4430b3d1b06bc (diff)
ext3: Update ctime in ext3_splice_branch() only when needed
Currently ext3 updates ctime in ext3_splice_branch() which is called whenever we allocate one block. But it is wasteful because ext3 doesn't support nanosecond timestamp. This leads to a performance loss. Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext3/inode.c')
-rw-r--r--fs/ext3/inode.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 2d0afeca0b4..6d3418662b5 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -756,6 +756,7 @@ static int ext3_splice_branch(handle_t *handle, struct inode *inode,
struct ext3_block_alloc_info *block_i;
ext3_fsblk_t current_block;
struct ext3_inode_info *ei = EXT3_I(inode);
+ struct timespec now;
block_i = ei->i_block_alloc_info;
/*
@@ -795,9 +796,11 @@ static int ext3_splice_branch(handle_t *handle, struct inode *inode,
}
/* We are done with atomic stuff, now do the rest of housekeeping */
-
- inode->i_ctime = CURRENT_TIME_SEC;
- ext3_mark_inode_dirty(handle, inode);
+ now = CURRENT_TIME_SEC;
+ if (!timespec_equal(&inode->i_ctime, &now) || !where->bh) {
+ inode->i_ctime = now;
+ ext3_mark_inode_dirty(handle, inode);
+ }
/* ext3_mark_inode_dirty already updated i_sync_tid */
atomic_set(&ei->i_datasync_tid, handle->h_transaction->t_tid);