From: "Yan, Zheng" <zyan@redhat.com>
Date: Thu, 5 Mar 2020 20:21:04 +0800
Subject: ceph: check all mds' caps after page writeback
Git-commit: bf73c62e7ff8dc220f3f57df4e42f9947320c447
Patch-mainline: v5.7-rc1
References: jsc#SES-1134

If an inode has caps from multiple mds's, the following can happen:

- non-auth mds revokes Fsc. Fcb is used, so page writeback is queued.
- when writeback finishes, ceph_check_caps() is called with auth only
  flag. ceph_check_caps() invalidates pagecache, but skips checking any
  non-auth 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  | 2 +-
 fs/ceph/inode.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 0b3a36310033..342a32c74c64 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3062,7 +3062,7 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
 	spin_unlock(&ci->i_ceph_lock);
 
 	if (last) {
-		ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
+		ceph_check_caps(ci, 0, NULL);
 	} else if (flush_snaps) {
 		ceph_flush_snaps(ci, NULL);
 	}
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index c7ff9f7067f6..ee40ba7e0e77 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1984,7 +1984,7 @@ void __ceph_do_pending_vmtruncate(struct inode *inode)
 	mutex_unlock(&ci->i_truncate_mutex);
 
 	if (wrbuffer_refs == 0)
-		ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
+		ceph_check_caps(ci, 0, NULL);
 
 	wake_up_all(&ci->i_cap_wq);
 }