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| author | Jan Kara <jack@suse.cz> | 2017-04-05 14:17:30 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-04-05 14:24:55 +0200 |
| commit | 1e0e653f1136a413a9969e5d0d548ee6499b9763 (patch) | |
| tree | a3e413e0affd13b0906dafa495501ee70216106d /kernel/reboot.c | |
| parent | reiserfs: Make cancel_old_flush() reliable (diff) | |
| download | linux-1e0e653f1136a413a9969e5d0d548ee6499b9763.tar.xz linux-1e0e653f1136a413a9969e5d0d548ee6499b9763.zip | |
reiserfs: Protect dquot_writeback_dquots() by s_umount semaphore
dquot_writeback_dquots() expects s_umount semaphore to be held to
protect it from other concurrent quota operations. reiserfs_sync_fs()
can call dquot_writeback_dquots() without holding s_umount semaphore
when called from flush_old_commits().
Fix the problem by grabbing s_umount in flush_old_commits(). However we
have to be careful and use only trylock since reiserfs_cancel_old_sync()
can be waiting for flush_old_commits() to complete while holding
s_umount semaphore. Possible postponing of sync work is not a big deal
though as that is only an opportunistic flush.
Fixes: 9d1ccbe70e0b14545caad12dc73adb3605447df0
Reported-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'kernel/reboot.c')
0 files changed, 0 insertions, 0 deletions