From: Jie Liu <jeff....@oracle.com>
Create a small file and fallocate it to a big size with
FALLOC_FL_KEEP_SIZE option, then truncate it back to the
small size again, the disk free space is not changed back
in this case. i.e,
# dd if=/dev/zero of=/mnt/test bs=512 count=1
# ls -l /mnt
total 4
-rw-r--r-- 1 root root 512 Jun 28 11:35 test
# df -h
Filesystem Size Used Avail Use% Mounted on
....
/dev/sdb1 8.0G 56K 7.2G 1% /mnt
# xfs_io -c 'falloc -k 512 5G' /mnt/test
# ls -l /mnt/test
-rw-r--r-- 1 root root 512 Jun 28 11:35 /mnt/test
# sync; df -h
Filesystem Size Used Avail Use% Mounted on
....
/dev/sdb1 8.0G 5.1G 2.2G 70% /mnt
# xfs_io -c 'truncate 512' /mnt/test
# sync; df -h
Filesystem Size Used Avail Use% Mounted on
....
/dev/sdb1 8.0G 5.1G 2.2G 70% /mnt
With this fix, the truncated up space is back as:
# sync; df -h
Filesystem Size Used Avail Use% Mounted on
....
/dev/sdb1 8.0G 56K 7.2G 1% /mnt
Signed-off-by: Jie Liu <jeff....@oracle.com>
---
fs/btrfs/inode.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 4f9d16b..7e1a5ff 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4509,9 +4509,6 @@ static int btrfs_setsize(struct inode *inode, struct
iattr *attr)
int mask = attr->ia_valid;
int ret;
- if (newsize == oldsize)
- return 0;
-
/*
* The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
* special case where we need to update the times despite not having
--
1.7.9.5
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