Commit 0cff9151 authored by Jan Kara's avatar Jan Kara
Browse files

quota: Acquire dqio_sem for reading in dquot_get_next_id() 



dquot_get_next_id() needs dqio_sem only for reading to protect against
racing with modification of quota file structure.

Reviewed-by: default avatarAndreas Dilger <adilger@dilger.ca>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 62676838

fs/quota/dquot.c

+2 −2
Original line number Diff line number Diff line
@@ -2079,9 +2079,9 @@ int dquot_get_next_id(struct super_block *sb, struct kqid *qid) 
		return -ESRCH;

	if (!dqopt->ops[qid->type]->get_next_id)

		return -ENOSYS;

	down_write(&dqopt->dqio_sem);

	down_read(&dqopt->dqio_sem);

	err = dqopt->ops[qid->type]->get_next_id(sb, qid);

	up_write(&dqopt->dqio_sem);

	up_read(&dqopt->dqio_sem);

	return err;

}

EXPORT_SYMBOL(dquot_get_next_id);