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authorJan Kara <jack@suse.cz>2017-06-08 15:48:16 +0200
committerJan Kara <jack@suse.cz>2017-08-17 19:03:09 +0200
commit8fc32c2b0db2c9ee0dffebea65bcdea03a29ba5a (patch)
tree1ad92b623f562ac9f160fb4ea8e4c9073d2cb4f5 /fs/quota
parentquota: Remove locking for reading from the old quota format (diff)
downloadlinux-8fc32c2b0db2c9ee0dffebea65bcdea03a29ba5a.tar.xz
linux-8fc32c2b0db2c9ee0dffebea65bcdea03a29ba5a.zip
quota: Push dqio_sem down to ->write_dqblk()
Push down acquisition of dqio_sem into ->write_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.c11
-rw-r--r--fs/quota/quota_v1.c3
-rw-r--r--fs/quota/quota_v2.c10
3 files changed, 16 insertions, 8 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 46046523abf0..562f5978488f 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -412,14 +412,14 @@ int dquot_acquire(struct dquot *dquot)
set_bit(DQ_READ_B, &dquot->dq_flags);
/* Instantiate dquot if needed */
if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
- down_write(&dqopt->dqio_sem);
ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
/* Write the info if needed */
if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
+ down_write(&dqopt->dqio_sem);
ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
dquot->dq_sb, dquot->dq_id.type);
+ up_write(&dqopt->dqio_sem);
}
- up_write(&dqopt->dqio_sem);
if (ret < 0)
goto out_iolock;
if (ret2 < 0) {
@@ -456,13 +456,10 @@ int dquot_commit(struct dquot *dquot)
spin_unlock(&dq_list_lock);
/* Inactive dquot can be only if there was error during read/init
* => we have better not writing it */
- if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
- down_write(&dqopt->dqio_sem);
+ if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
- up_write(&dqopt->dqio_sem);
- } else {
+ else
ret = -EIO;
- }
out_lock:
mutex_unlock(&dquot->dq_lock);
return ret;
diff --git a/fs/quota/quota_v1.c b/fs/quota/quota_v1.c
index 12d69cda57cc..94cceb76b9a3 100644
--- a/fs/quota/quota_v1.c
+++ b/fs/quota/quota_v1.c
@@ -83,7 +83,9 @@ static int v1_commit_dqblk(struct dquot *dquot)
short type = dquot->dq_id.type;
ssize_t ret;
struct v1_disk_dqblk dqblk;
+ struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
+ down_write(&dqopt->dqio_sem);
v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
if (((type == USRQUOTA) && uid_eq(dquot->dq_id.uid, GLOBAL_ROOT_UID)) ||
((type == GRPQUOTA) && gid_eq(dquot->dq_id.gid, GLOBAL_ROOT_GID))) {
@@ -97,6 +99,7 @@ static int v1_commit_dqblk(struct dquot *dquot)
ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type,
(char *)&dqblk, sizeof(struct v1_disk_dqblk),
v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id)));
+ up_write(&dqopt->dqio_sem);
if (ret != sizeof(struct v1_disk_dqblk)) {
quota_error(dquot->dq_sb, "dquota write failed");
if (ret >= 0)
diff --git a/fs/quota/quota_v2.c b/fs/quota/quota_v2.c
index b2cd34f6b3da..482733abe4ac 100644
--- a/fs/quota/quota_v2.c
+++ b/fs/quota/quota_v2.c
@@ -298,7 +298,15 @@ static int v2_read_dquot(struct dquot *dquot)
static int v2_write_dquot(struct dquot *dquot)
{
- return qtree_write_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_write(&dqopt->dqio_sem);
+ ret = qtree_write_dquot(
+ sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv,
+ dquot);
+ up_write(&dqopt->dqio_sem);
+ return ret;
}
static int v2_release_dquot(struct dquot *dquot)