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>
7cddc19392