Forwarded: test patch

[syzbot <syzbot+78359d5fbb04318c35e9@syzkaller.appspotmail.com>]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: test patch
Author: heming.zhao@suse.com

#syz test

diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index e85b1ccf81be..4321d8f59402 100644
--- a/fs/ocfs2/quota_global.c
+++ b/fs/ocfs2/quota_global.c
@@ -311,7 +311,10 @@ int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 	spin_unlock(&dq_data_lock);
 	if (ex) {
 		inode_lock(oinfo->dqi_gqinode);
-		down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
+		if (!down_write_trylock(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem)) {
+			inode_unlock(oinfo->dqi_gqinode);
+			return -EBUSY;
+		}
 	} else {
 		down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 	}
diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index de7f12858729..b7555aff169e 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -1224,7 +1224,10 @@ int ocfs2_create_local_dquot(struct dquot *dquot)
 	int status;
 	u64 pcount;
 
-	down_write(&OCFS2_I(lqinode)->ip_alloc_sem);
+	if (!down_write_trylock(&OCFS2_I(lqinode)->ip_alloc_sem)) {
+		status = -EBUSY;
+		goto out;
+	}
 	chunk = ocfs2_find_free_entry(sb, type, &offset);
 	if (!chunk) {
 		chunk = ocfs2_extend_local_quota_file(sb, type, &offset);