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authorJie Liu <jeff.liu@oracle.com>2013-06-28 13:15:52 +0800
committerChris Mason <chris.mason@fusionio.com>2013-08-09 19:28:56 -0400
commit7cddc193924ef6ce679ef0977e01e96d0aedfd1d (patch)
tree9784e641834f59f845ee6b4b307b7826ae0596c9
parentc095ba7224d8edc71dcef0d655911399a8bd4a3f (diff)
btrfs: fix file truncation if FALLOC_FL_KEEP_SIZE is specified
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, total 4 -rw-r--r-- 1 root root 512 Jun 28 11:35 test Filesystem Size Used Avail Use% Mounted on .... /dev/sdb1 8.0G 56K 7.2G 1% /mnt -rw-r--r-- 1 root root 512 Jun 28 11:35 /mnt/test Filesystem Size Used Avail Use% Mounted on .... /dev/sdb1 8.0G 5.1G 2.2G 70% /mnt 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: Filesystem Size Used Avail Use% Mounted on .... /dev/sdb1 8.0G 56K 7.2G 1% /mnt Signed-off-by: Jie Liu <jeff.liu@oracle.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
-rw-r--r--fs/btrfs/inode.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 6d1b93c8aaf..0fd7647c893 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4391,9 +4391,6 @@ 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