From: Seth Forshee <seth.fors...@canonical.com> 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.fors...@canonical.com Fixes: ea3271f7196c ("tmpfs: support 64-bit inums per-sb") Signed-off-by: Seth Forshee <seth.fors...@canonical.com> Acked-by: Hugh Dickins <hu...@google.com> Cc: Chris Down <ch...@chrisdown.name> Cc: Hugh Dickins <hu...@google.com> Cc: Amir Goldstein <amir7...@gmail.com> Cc: Heiko Carstens <h...@linux.ibm.com> Cc: Vasily Gorbik <g...@linux.ibm.com> Cc: Christian Borntraeger <borntrae...@de.ibm.com> Cc: <sta...@vger.kernel.org> [5.9+] Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Linus Torvalds <torva...@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- 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
