This is a note to let you know that I've just added the patch titled
devtmpfs regression fix: reconfigure on each mount
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
devtmpfs-regression-fix-reconfigure-on-each-mount.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a6097180d884ddab769fb25588ea8598589c218c Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@xxxxxxx>
Date: Mon, 17 Jan 2022 09:07:26 +1100
Subject: devtmpfs regression fix: reconfigure on each mount
From: NeilBrown <neilb@xxxxxxx>
commit a6097180d884ddab769fb25588ea8598589c218c upstream.
Prior to Linux v5.4 devtmpfs used mount_single() which treats the given
mount options as "remount" options, so it updates the configuration of
the single super_block on each mount.
Since that was changed, the mount options used for devtmpfs are ignored.
This is a regression which affect systemd - which mounts devtmpfs with
"-o mode=755,size=4m,nr_inodes=1m".
This patch restores the "remount" effect by calling reconfigure_single()
Fixes: d401727ea0d7 ("devtmpfs: don't mix {ramfs,shmem}_fill_super() with mount_single()")
Acked-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/devtmpfs.c | 7 +++++++
fs/super.c | 4 ++--
include/linux/fs_context.h | 2 ++
3 files changed, 11 insertions(+), 2 deletions(-)
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -59,8 +59,15 @@ static struct dentry *public_dev_mount(s
const char *dev_name, void *data)
{
struct super_block *s = mnt->mnt_sb;
+ int err;
+
atomic_inc(&s->s_active);
down_write(&s->s_umount);
+ err = reconfigure_single(s, flags, data);
+ if (err < 0) {
+ deactivate_locked_super(s);
+ return ERR_PTR(err);
+ }
return dget(s->s_root);
}
--- a/fs/super.c
+++ b/fs/super.c
@@ -1423,8 +1423,8 @@ struct dentry *mount_nodev(struct file_s
}
EXPORT_SYMBOL(mount_nodev);
-static int reconfigure_single(struct super_block *s,
- int flags, void *data)
+int reconfigure_single(struct super_block *s,
+ int flags, void *data)
{
struct fs_context *fc;
int ret;
--- a/include/linux/fs_context.h
+++ b/include/linux/fs_context.h
@@ -142,6 +142,8 @@ extern void put_fs_context(struct fs_con
extern int vfs_parse_fs_param_source(struct fs_context *fc,
struct fs_parameter *param);
extern void fc_drop_locked(struct fs_context *fc);
+int reconfigure_single(struct super_block *s,
+ int flags, void *data);
/*
* sget() wrappers to be called from the ->get_tree() op.
Patches currently in stable-queue which might be from neilb@xxxxxxx are
queue-5.16/devtmpfs-regression-fix-reconfigure-on-each-mount.patch
