releases/6.11.2/debugfs-show-actual-source-in-proc-mounts.patch

From 3a987b88a42593875f6345188ca33731c7df728c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20Aur=C3=A8le=20La=20France?= <tsi@tuyoix.net>
Date: Sat, 10 Aug 2024 13:25:27 -0600
Subject: debugfs show actual source in /proc/mounts
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From: Marc Aurèle La France <tsi@tuyoix.net>

commit 3a987b88a42593875f6345188ca33731c7df728c upstream.

After its conversion to the new mount API, debugfs displays "none" in
/proc/mounts instead of the actual source.  Fix this by recognising its
"source" mount option.

Signed-off-by: Marc Aurèle La France <tsi@tuyoix.net>
Link: https://lore.kernel.org/r/e439fae2-01da-234b-75b9-2a7951671e27@tuyoix.net
Fixes: a20971c18752 ("vfs: Convert debugfs to use the new mount API")
Cc: stable@vger.kernel.org # 6.10.x: 49abee5991e1: debugfs: Convert to new uid/gid option parsing helpers
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/debugfs/inode.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -89,12 +89,14 @@ enum {
 	Opt_uid,
 	Opt_gid,
 	Opt_mode,
+	Opt_source,
 };
 
 static const struct fs_parameter_spec debugfs_param_specs[] = {
 	fsparam_gid	("gid",		Opt_gid),
 	fsparam_u32oct	("mode",	Opt_mode),
 	fsparam_uid	("uid",		Opt_uid),
+	fsparam_string	("source",	Opt_source),
 	{}
 };
 
@@ -126,6 +128,12 @@ static int debugfs_parse_param(struct fs
 	case Opt_mode:
 		opts->mode = result.uint_32 & S_IALLUGO;
 		break;
+	case Opt_source:
+		if (fc->source)
+			return invalfc(fc, "Multiple sources specified");
+		fc->source = param->string;
+		param->string = NULL;
+		break;
 	/*
 	 * We might like to report bad mount options here;
 	 * but traditionally debugfs has ignored all mount options