From: "Yan, Zheng" <zyan@redhat.com>
Date: Tue, 10 Mar 2020 19:34:21 +0800
Subject: ceph: wait for async creating inode before requesting new max size
Git-commit: 9bccb76574ad9ba6f5868b09053179fa2e72f8e0
Patch-mainline: v5.7-rc1
References: jsc#SES-1134

ceph_check_caps() can't request new max size for async creating inode.
This may make ceph_get_caps() loop busily until getting reply of the
async create. Also, wait for async creating reply before calling
ceph_renew_caps().

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/caps.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index be1ae4b92cfd..185db76300b3 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2833,6 +2833,11 @@ int ceph_get_caps(struct file *filp, int need, int want,
 		}
 
 		if (ret < 0) {
+			if (ret == -EFBIG || ret == -ESTALE) {
+				int ret2 = ceph_wait_on_async_create(inode);
+				if (ret2 < 0)
+					return ret2;
+			}
 			if (ret == -EFBIG) {
 				check_max_size(inode, endoff);
 				continue;