Commit 2a64f80e authored by Jan Kara's avatar Jan Kara

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: default avatarEric Ren <zren@suse.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 9d1ccbe7
......@@ -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));
}
......
......@@ -985,7 +985,6 @@ static void ocfs2_disable_quotas(struct ocfs2_super *osb)
for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
if (!sb_has_quota_loaded(sb, type))
continue;
/* Cancel periodic syncing before we grab dqonoff_mutex */
oinfo = sb_dqinfo(sb, type)->dqi_priv;
cancel_delayed_work_sync(&oinfo->dqi_sync_work);
inode = igrab(sb->s_dquot.files[type]);
......
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