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quota: Handle Q_GETNEXTQUOTA when quota is disabled

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Currently we oopsed when Q_GETNEXTQUOTA got called when quota was
disabled. Properly check whether quota is enabled for the filesystem
before calling into quota format handler.

Reported-by: Ted Tso <tytso@mit.edu>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2016-03-29 17:20:10 +02:00
parent 1993b176a8
commit 17e8a8936c
1 changed files with 11 additions and 2 deletions
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13
fs/quota/dquot.c
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@ -2047,11 +2047,20 @@ int dquot_get_next_id(struct super_block *sb, struct kqid *qid)
struct quota_info *dqopt = sb_dqopt(sb);
int err;
if (!dqopt->ops[qid->type]->get_next_id)
return -ENOSYS;
mutex_lock(&dqopt->dqonoff_mutex);
if (!sb_has_quota_active(sb, qid->type)) {
err = -ESRCH;
goto out;
}
if (!dqopt->ops[qid->type]->get_next_id) {
err = -ENOSYS;
goto out;
}
mutex_lock(&dqopt->dqio_mutex);
err = dqopt->ops[qid->type]->get_next_id(sb, qid);
mutex_unlock(&dqopt->dqio_mutex);
out:
mutex_unlock(&dqopt->dqonoff_mutex);
return err;
}