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authorJan Kara <jack@suse.cz>2017-06-08 15:30:45 +0200
committerJan Kara <jack@suse.cz>2017-08-17 19:01:00 +0200
commite342e38df925973b86cd46d40bbe7f083414e2ad (patch)
treeace185b868c9439b20fc9febf997e29770d4dc37 /fs/quota
parentquota: Protect dquot writeout with dq_lock (diff)
downloadlinux-e342e38df925973b86cd46d40bbe7f083414e2ad.tar.xz
linux-e342e38df925973b86cd46d40bbe7f083414e2ad.zip
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>
Diffstat (limited to 'fs/quota')
-rw-r--r--fs/quota/dquot.c5
-rw-r--r--fs/quota/quota_v1.c5
-rw-r--r--fs/quota/quota_v2.c10
3 files changed, 14 insertions, 6 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 8b52e852eba2..46046523abf0 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -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 */
diff --git a/fs/quota/quota_v1.c b/fs/quota/quota_v1.c
index 8fe79beced5c..d534c4043237 100644
--- a/fs/quota/quota_v1.c
+++ b/fs/quota/quota_v1.c
@@ -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;
}
diff --git a/fs/quota/quota_v2.c b/fs/quota/quota_v2.c
index ca71bf881ad1..b2cd34f6b3da 100644
--- a/fs/quota/quota_v2.c
+++ b/fs/quota/quota_v2.c
@@ -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)