linux-ext4 - [PATCH v2] ext3: Update ctime in ext3_splice

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Date:	Wed, 08 Feb 2012 16:34:29 +0900
From:	Kazuya Mio <k-mio@...jp.nec.com>
To:	ext4 <linux-ext4@...r.kernel.org>, jan Kara <jack@...e.cz>,
	Andreas Dilger <adilger@...ger.ca>
Subject: [PATCH v2] 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@...jp.nec.com>
---
 fs/ext3/inode.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 2d0afec..3c7fd63 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);
 
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