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: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Jan 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);