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| author | Aleksa Sarai <asarai@suse.de> | 2017-07-04 21:49:06 +1000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-09-13 14:13:36 -0700 |
| commit | 0f7dbc4d5bc88432ab1c8639c66628d4f5903ae9 (patch) | |
| tree | 292cf14120ce862e76e94b16c919c4cbd1a6db7b /tools/testing/selftests | |
| parent | f52a535c8438d4761c9b42a63e1b6971415a5744 (diff) | |
btrfs: resume qgroup rescan on rw remount
commit 6c6b5a39c4bf3dbd8cf629c9f5450e983c19dbb9 upstream.
Several distributions mount the "proper root" as ro during initrd and
then remount it as rw before pivot_root(2). Thus, if a rescan had been
aborted by a previous shutdown, the rescan would never be resumed.
This issue would manifest itself as several btrfs ioctl(2)s causing the
entire machine to hang when btrfs_qgroup_wait_for_completion was hit
(due to the fs_info->qgroup_rescan_running flag being set but the rescan
itself not being resumed). Notably, Docker's btrfs storage driver makes
regular use of BTRFS_QUOTA_CTL_DISABLE and BTRFS_IOC_QUOTA_RESCAN_WAIT
(causing this problem to be manifested on boot for some machines).
Cc: Jeff Mahoney <jeffm@suse.com>
Fixes: b382a324b60f ("Btrfs: fix qgroup rescan resume on mount")
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Tested-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/testing/selftests')
0 files changed, 0 insertions, 0 deletions