From: Qu Wenruo <quwenruo@cn.fujitsu.com>
To: <linux-btrfs@vger.kernel.org>
Subject: [PATCH] btrfs: Avoid truncate tailing page if fallocate range doesn't exceed inode size
Date: Tue, 29 Sep 2015 16:38:41 +0800 [thread overview]
Message-ID: <1443515921-22569-1-git-send-email-quwenruo@cn.fujitsu.com> (raw)
Current code will always truncate tailing page if its alloc_start is
smaller than inode size.
This behavior will cause a lot of unneeded COW page size extent.
This patch will avoid such problem.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
---
fs/btrfs/file.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index b823fac..8c6f247 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2584,7 +2584,7 @@ static long btrfs_fallocate(struct file *file, int mode,
alloc_start);
if (ret)
goto out;
- } else {
+ } else if (offset + len > inode->i_size) {
/*
* If we are fallocating from the end of the file onward we
* need to zero out the end of the page if i_size lands in the
--
2.5.3
reply other threads:[~2015-09-29 8:40 UTC|newest]
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