Remove dqptr_sem to make quota code scalable (but kept in struct
quota_info to keep kernel ABI unchanged): Protect the Q_GETFMT by
dqonoff_mutex instead of dqptr_sem.
Signed-off-by: Lai Siyao <lai.siyao@xxxxxxxxx>
Signed-off-by: Niu Yawei <yawei.niu@xxxxxxxxx>
---
fs/quota/quota.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 2b363e2..e4851cb 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -79,13 +79,13 @@ static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
{
__u32 fmt;
- down_read(&sb_dqopt(sb)->dqptr_sem);
+ mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
if (!sb_has_quota_active(sb, type)) {
- up_read(&sb_dqopt(sb)->dqptr_sem);
+ mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
return -ESRCH;
}
fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
- up_read(&sb_dqopt(sb)->dqptr_sem);
+ mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
if (copy_to_user(addr, &fmt, sizeof(fmt)))
return -EFAULT;
return 0;
--
1.7.1
--
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