This is a note to let you know that I've just added the patch titled
tmpfs: disallow CONFIG_TMPFS_INODE64 on s390
to the 5.10-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:
tmpfs-disallow-config_tmpfs_inode64-on-s390.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b85a7a8bb5736998b8a681937a9749b350c17988 Mon Sep 17 00:00:00 2001
From: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>
Date: Tue, 9 Feb 2021 13:42:14 -0800
Subject: tmpfs: disallow CONFIG_TMPFS_INODE64 on s390
From: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>
commit b85a7a8bb5736998b8a681937a9749b350c17988 upstream.
Currently there is an assumption in tmpfs that 64-bit architectures also
have a 64-bit ino_t. This is not true on s390 which has a 32-bit ino_t.
With CONFIG_TMPFS_INODE64=y tmpfs mounts will get 64-bit inode numbers
and display "inode64" in the mount options, but passing the "inode64"
mount option will fail. This leads to the following behavior:
# mkdir mnt
# mount -t tmpfs nodev mnt
# mount -o remount,rw mnt
mount: /home/ubuntu/mnt: mount point not mounted or bad option.
As mount sees "inode64" in the mount options and thus passes it in the
options for the remount.
So prevent CONFIG_TMPFS_INODE64 from being selected on s390.
Link: https://lkml.kernel.org/r/20210205230620.518245-1-seth.forshee@xxxxxxxxxxxxx
Fixes: ea3271f7196c ("tmpfs: support 64-bit inums per-sb")
Signed-off-by: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>
Acked-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Chris Down <chris@xxxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Amir Goldstein <amir73il@xxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [5.9+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -203,7 +203,7 @@ config TMPFS_XATTR
config TMPFS_INODE64
bool "Use 64-bit ino_t by default in tmpfs"
- depends on TMPFS && 64BIT
+ depends on TMPFS && 64BIT && !S390
default n
help
tmpfs has historically used only inode numbers as wide as an unsigned
Patches currently in stable-queue which might be from seth.forshee@xxxxxxxxxxxxx are
queue-5.10/tmpfs-disallow-config_tmpfs_inode64-on-alpha.patch
queue-5.10/tmpfs-disallow-config_tmpfs_inode64-on-s390.patch
