From: Paulo Alcantara <pc@cjr.nz>
Date: Thu, 29 Dec 2022 12:33:55 -0300
Subject: [PATCH] cifs: ignore ipc reconnect failures during dfs failover
Git-commit: 9e6002c8738a9d5675ba706fcdbc0a544f814974
References: bsc#1193629
Patch-mainline: v6.2-rc3
If it failed to reconnect ipc used for getting referrals, we can just
ignore it as it is not required for reconnecting the share. The worst
case would be not being able to detect or chase nested links as long
as dfs root server is unreachable.
Before patch:
$ mount.cifs //root/dfs/link /mnt -o echo_interval=10,...
-> target share: /fs0/share
disconnect root & fs0
$ ls /mnt
ls: cannot access '/mnt': Host is down
connect fs0
$ ls /mnt
ls: cannot access '/mnt': Resource temporarily unavailable
After patch:
$ mount.cifs //root/dfs/link /mnt -o echo_interval=10,...
-> target share: /fs0/share
disconnect root & fs0
$ ls /mnt
ls: cannot access '/mnt': Host is down
connect fs0
$ ls /mnt
bar.rtf dir1 foo
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Paulo Alcantara <palcantara@suse.de>
---
fs/cifs/dfs.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/fs/cifs/dfs.c b/fs/cifs/dfs.c
index b541e68378f6..30086f2060a1 100644
--- a/fs/cifs/dfs.c
+++ b/fs/cifs/dfs.c
@@ -401,8 +401,7 @@ static int __tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *t
if (ipc->need_reconnect) {
scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
rc = ops->tree_connect(xid, ipc->ses, tree, ipc, cifs_sb->local_nls);
- if (rc)
- break;
+ cifs_dbg(FYI, "%s: reconnect ipc: %d\n", __func__, rc);
}
scnprintf(tree, MAX_TREE_SIZE, "\\%s", share);
--
2.39.0