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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>
This commit is contained in:
Jan Kara 2017-06-08 15:05:08 +02:00
parent 62676838cb
commit 0cff9151d3
1 changed files with 2 additions and 2 deletions
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4
fs/quota/dquot.c
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@ -2079,9 +2079,9 @@ int dquot_get_next_id(struct super_block *sb, struct kqid *qid)
return -ESRCH; return -ESRCH;
if (!dqopt->ops[qid->type]->get_next_id) if (!dqopt->ops[qid->type]->get_next_id)
return -ENOSYS; return -ENOSYS;
down_write(&dqopt->dqio_sem); down_read(&dqopt->dqio_sem);
err = dqopt->ops[qid->type]->get_next_id(sb, qid); err = dqopt->ops[qid->type]->get_next_id(sb, qid);
up_write(&dqopt->dqio_sem); up_read(&dqopt->dqio_sem);
return err; return err;
} }
EXPORT_SYMBOL(dquot_get_next_id); EXPORT_SYMBOL(dquot_get_next_id);