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quota: Push dqio_sem down to ->read_dqblk()

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Push down acquisition of dqio_sem into ->read_dqblk() callback. It will
allow quota formats to decide whether they need it or not.

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 15:30:45 +02:00
parent 5e8cb9b624
commit e342e38df9
3 changed files with 14 additions and 6 deletions
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5
fs/quota/dquot.c
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@@ -403,11 +403,8 @@ int dquot_acquire(struct dquot *dquot)
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
mutex_lock(&dquot->dq_lock);
if (!test_bit(DQ_READ_B, &dquot->dq_flags)) {
down_read(&dqopt->dqio_sem);
if (!test_bit(DQ_READ_B, &dquot->dq_flags))
ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot);
up_read(&dqopt->dqio_sem);
}
if (ret < 0)
goto out_iolock;
/* Make sure flags update is visible after dquot has been filled */