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author | Jeff Mahoney <jeffm@suse.com> | 2016-08-15 12:10:33 -0400 |
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committer | Chris Mason <clm@fb.com> | 2016-08-25 03:58:19 -0700 |
commit | d2c609b834d62f1e91f1635a27dca29f7806d3d6 (patch) | |
tree | 446eb20c30b212f1ad9def7dc95cb156fd3a2951 /fs/pstore | |
parent | eecba891d38051ebf7f4af6394d188a5fd151a6a (diff) |
btrfs: properly track when rescan worker is running
The qgroup_flags field is overloaded such that it reflects the on-disk
status of qgroups and the runtime state. The BTRFS_QGROUP_STATUS_FLAG_RESCAN
flag is used to indicate that a rescan operation is in progress, but if
the file system is unmounted while a rescan is running, the rescan
operation is paused. If the file system is then mounted read-only,
the flag will still be present but the rescan operation will not have
been resumed. When we go to umount, btrfs_qgroup_wait_for_completion
will see the flag and interpret it to mean that the rescan worker is
still running and will wait for a completion that will never come.
This patch uses a separate flag to indicate when the worker is
running. The locking and state surrounding the qgroup rescan worker
needs a lot of attention beyond this patch but this is enough to
avoid a hung umount.
Cc: <stable@vger.kernel.org> # v4.4+
Signed-off-by; Jeff Mahoney <jeffm@suse.com>
Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/pstore')
0 files changed, 0 insertions, 0 deletions