From: Jeff Layton <jlayton@kernel.org>
Date: Mon, 2 Aug 2021 15:32:47 -0400
Subject: ceph: print more information when we can't find snaprealm
Git-commit: 692e17159792a13e8c5031bdc0ae9b0f3158593d
Patch-mainline: v5.15-rc1
References: jsc#SES-1880

Print a bit more information when we can't find the realm during
ceph_add_cap. Show both the inode number and the old realm inode
number.

Suggested-by: Sage Weil <sage@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/caps.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index b75a9e1d6882..1f544eeecf79 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -703,13 +703,12 @@ void ceph_add_cap(struct inode *inode,
 		 */
 		struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
 							       realmino);
-		if (realm) {
+		if (realm)
 			ceph_change_snap_realm(inode, realm);
-		} else {
-			pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
-			       realmino);
-			WARN_ON(!realm);
-		}
+		else
+			WARN(1, "%s: couldn't find snap realm 0x%llx (ino 0x%llx oldrealm 0x%llx)\n",
+			     __func__, realmino, ci->i_vino.ino,
+			     ci->i_snap_realm ? ci->i_snap_realm->ino : 0);
 	}
 
 	__check_cap_issue(ci, cap, issued);