FAILED: patch "[PATCH] smb3: display network namespace in debug information" failed to apply to 4.19-stable tree

FAILED: patch "[PATCH] smb3: display network namespace in debug information" failed to apply to 4.19-stable tree

[gregkh]

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y
git checkout FETCH_HEAD
git cherry-pick -x 7b38f6ddc97bf572c3422d3175e8678dd95502fa
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023082056-gesture-daisy-bf13@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

7b38f6ddc97b ("smb3: display network namespace in debug information")
3ae872de4107 ("smb: client: fix shared DFS root mounts with different prefixes")
38c8a9a52082 ("smb: move client and server files to common directory fs/smb")
72a7804a667e ("cifs: fix smb1 mount regression")
8e3554150d6c ("cifs: fix sharing of DFS connections")
3dc9c433c9dd ("cifs: protect access of TCP_Server_Info::{origin,leaf}_fullpath")
ee20d7c61007 ("cifs: fix potential race when tree connecting ipc")
d5a863a153e9 ("cifs: avoid dup prefix path in dfs_get_automount_devname()")
2f4e429c8469 ("cifs: lock chan_lock outside match_session")
396935de1455 ("cifs: fix use-after-free bug in refresh_cache_worker()")
b56bce502f55 ("cifs: set DFS root session in cifs_get_smb_ses()")
b9ee2e307c6b ("cifs: improve checking of DFS links over STATUS_OBJECT_NAME_INVALID")
9e6002c8738a ("cifs: ignore ipc reconnect failures during dfs failover")
7ad54b98fc1f ("cifs: use origin fullpath for automounts")
466611e4af82 ("cifs: fix source pathname comparison of dfs supers")
1d04a6fe75ee ("cifs: don't block in dfs_cache_noreq_update_tgthint()")
6916881f443f ("cifs: fix refresh of cached referrals")
cb3f6d876452 ("cifs: don't refresh cached referrals from unactive mounts")
a1c0d00572fc ("cifs: share dfs connections and supers")
a73a26d97eca ("cifs: split out ses and tcon retrieval from mount_get_conns()")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 7b38f6ddc97bf572c3422d3175e8678dd95502fa Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@microsoft.com>
Date: Thu, 10 Aug 2023 21:41:03 -0500
Subject: [PATCH] smb3: display network namespace in debug information

We recently had problems where a network namespace was deleted
causing hard to debug reconnect problems.  To help deal with
configuration issues like this it is useful to dump the network
namespace to better debug what happened.

So add this to information displayed in /proc/fs/cifs/DebugData for
the server (and channels if mounted with multichannel). For example:

   Local Users To Server: 1 SecMode: 0x1 Req On Wire: 0 Net namespace: 4026531840

This can be easily compared with what is displayed for the
processes on the system. For example /proc/1/ns/net in this case
showed the same thing (see below), and we can see that the namespace
is still valid in this example.

   'net:[4026531840]'

Cc: stable@vger.kernel.org
Acked-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/client/cifs_debug.c b/fs/smb/client/cifs_debug.c
index fb4162a52844..aec6e9137474 100644
--- a/fs/smb/client/cifs_debug.c
+++ b/fs/smb/client/cifs_debug.c
@@ -153,6 +153,11 @@ cifs_dump_channel(struct seq_file *m, int i, struct cifs_chan *chan)
 		   in_flight(server),
 		   atomic_read(&server->in_send),
 		   atomic_read(&server->num_waiters));
+#ifdef CONFIG_NET_NS
+	if (server->net)
+		seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
+#endif /* NET_NS */
+
 }
 
 static inline const char *smb_speed_to_str(size_t bps)
@@ -430,10 +435,15 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 				server->reconnect_instance,
 				server->srv_count,
 				server->sec_mode, in_flight(server));
+#ifdef CONFIG_NET_NS
+		if (server->net)
+			seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
+#endif /* NET_NS */
 
 		seq_printf(m, "\nIn Send: %d In MaxReq Wait: %d",
 				atomic_read(&server->in_send),
 				atomic_read(&server->num_waiters));
+
 		if (server->leaf_fullpath) {
 			seq_printf(m, "\nDFS leaf full path: %s",
 				   server->leaf_fullpath);