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authorJan Kara <jack@suse.cz>2016-11-23 15:47:57 +0300
committerJan Kara <jack@suse.cz>2016-11-30 10:36:54 +0300
commit2a64f80ee3ab47dc0114e077ea27903c97882138 (patch)
tree1d07451b22176490840eda1efb0637e6e450e063 /fs/ocfs2/quota_global.c
parent9d1ccbe70e0b14545caad12dc73adb3605447df0 (diff)
downloadlinux-2a64f80ee3ab47dc0114e077ea27903c97882138.tar.xz
ocfs2: Protect periodic quota syncing with s_umount semaphore
New quota locking rules will require s_umount semaphore for all quota scanning functions. Add is for periodic quota syncing. Tested-by: Eric Ren <zren@suse.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ocfs2/quota_global.c')
-rw-r--r--fs/ocfs2/quota_global.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index 87e577a49b0d..cec495a921e3 100644
--- a/fs/ocfs2/quota_global.c
+++ b/fs/ocfs2/quota_global.c
@@ -634,7 +634,15 @@ static void qsync_work_fn(struct work_struct *work)
dqi_sync_work.work);
struct super_block *sb = oinfo->dqi_gqinode->i_sb;
- dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
+ /*
+ * We have to be careful here not to deadlock on s_umount as umount
+ * disabling quotas may be in progress and it waits for this work to
+ * complete. If trylock fails, we'll do the sync next time...
+ */
+ if (down_read_trylock(&sb->s_umount)) {
+ dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
+ up_read(&sb->s_umount);
+ }
schedule_delayed_work(&oinfo->dqi_sync_work,
msecs_to_jiffies(oinfo->dqi_syncms));
}