From: Miao Xie <miaox@cn.fujitsu.com>
To: Linux Btrfs <linux-btrfs@vger.kernel.org>
Subject: [PATCH 3/6] Btrfs: fix off-by-one error of the same page check in btrfs_punch_hole()
Date: Wed, 05 Dec 2012 18:53:45 +0800 [thread overview]
Message-ID: <50BF27B9.7030501@cn.fujitsu.com> (raw)
(start + len) is the start of the adjacent extent, not the end of the current
extent, so we should not use it to check the hole is on the same page or not.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
---
fs/btrfs/file.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index bd5afcc..b477da2 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1881,8 +1881,8 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len)
unsigned long nr;
int ret = 0;
int err = 0;
- bool same_page = (offset >> PAGE_CACHE_SHIFT) ==
- ((offset + len) >> PAGE_CACHE_SHIFT);
+ bool same_page = ((offset >> PAGE_CACHE_SHIFT) ==
+ ((offset + len - 1) >> PAGE_CACHE_SHIFT));
btrfs_wait_ordered_range(inode, offset, len);
--
1.7.11.7
reply other threads:[~2012-12-05 10:53 UTC|newest]
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