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quota: Push dqio_sem down to ->read_dqblk() 

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
View File

@ -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 */

5
fs/quota/quota_v1.c
View File

@ -56,10 +56,12 @@ static int v1_read_dqblk(struct dquot *dquot)
{
int type = dquot->dq_id.type;
struct v1_disk_dqblk dqblk;
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
if (!sb_dqopt(dquot->dq_sb)->files[type])
if (!dqopt->files[type])
return -EINVAL;
down_read(&dqopt->dqio_sem);
/* Set structure to 0s in case read fails/is after end of file */
memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk,
@ -73,6 +75,7 @@ static int v1_read_dqblk(struct dquot *dquot)
dquot->dq_dqb.dqb_isoftlimit == 0)
set_bit(DQ_FAKE_B, &dquot->dq_flags);
dqstats_inc(DQST_READS);
up_read(&dqopt->dqio_sem);
return 0;
}

10
fs/quota/quota_v2.c
View File

@ -285,7 +285,15 @@ static int v2r1_is_id(void *dp, struct dquot *dquot)
static int v2_read_dquot(struct dquot *dquot)
{
return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
int ret;
down_read(&dqopt->dqio_sem);
ret = qtree_read_dquot(
sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
dquot);
up_read(&dqopt->dqio_sem);
return ret;
}
static int v2_write_dquot(struct dquot *dquot)