* [PATCH] btrfs: Avoid truncate tailing page if fallocate range doesn't exceed inode size
@ 2015-09-29 8:38 Qu Wenruo
0 siblings, 0 replies; only message in thread
From: Qu Wenruo @ 2015-09-29 8:38 UTC (permalink / raw)
To: linux-btrfs
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
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2015-09-29 8:38 [PATCH] btrfs: Avoid truncate tailing page if fallocate range doesn't exceed inode size Qu Wenruo
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