diff options
| author | Guo Chao <yan@linux.vnet.ibm.com> | 2013-02-22 00:16:46 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-02-22 10:43:22 +0100 |
| commit | 541c742a7559eb65f0e36d3e2338c2ca532a3e61 (patch) | |
| tree | 73ac23dda59eb39cc026bc3264e21abaa077328a /kernel/taskstats.c | |
| parent | loopdev: fix a deadlock (diff) | |
| download | linux-541c742a7559eb65f0e36d3e2338c2ca532a3e61.tar.xz linux-541c742a7559eb65f0e36d3e2338c2ca532a3e61.zip | |
loopdev: update block device size in loop_set_status()
Loop device driver sometimes fails to impose the size limit on the
device. Keep issuing following two commands:
losetup --offset 7517244416 --sizelimit 3224971264 /dev/loop0 backed_file
blockdev --getsize64 /dev/loop0
blockdev reports file size instead of sizelimit several out of 100 times.
The problems are:
- losetup set up the device in two ioctl:
LOOP_SET_FD and LOOP_SET_STATUS64.
- LOOP_SET_STATUS64 only update size of gendisk.
Block device size will be updated lazily when device comes to use. If udev
rushes in between the two ioctl, it will bring in a block device whose
size is backing file size. If the device is not released after
LOOP_SET_STATUS64 ioctl, blockdev will not see the updated size.
Update block size in LOOP_SET_STATUS64 ioctl.
Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Reported-by: M. Hindess <hindessm@uk.ibm.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Guo Chao <yan@linux.vnet.ibm.com>
Cc: Nikanth Karthikesan <knikanth@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'kernel/taskstats.c')
0 files changed, 0 insertions, 0 deletions