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quota: Remove locking for writing to the old quota format 

The old quota quota format has fixed offset in quota file based on ID so
there's no locking needed against concurrent modifications of the file
(locking against concurrent IO on the same dquot is still provided by
dq_lock).

Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Jan Kara <jack@suse.cz>
zero-colors
Jan Kara 2017-06-08 16:18:54 +02:00
parent d2faa41516
commit f0c5bae5cc
1 changed files with 0 additions and 3 deletions
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3
fs/quota/quota_v1.c
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@ -83,9 +83,7 @@ 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))) {
@ -99,7 +97,6 @@ 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)