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authorSeth Forshee <seth.forshee@canonical.com>2021-02-09 13:42:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-09 17:26:44 -0800
commitb85a7a8bb5736998b8a681937a9749b350c17988 (patch)
tree4f74c12e21f16caafb680a083c9bf4147c1c6a30 /fs/Kconfig
parenta30a29091b5a6d4c64b5fc77040720a65e2dd4e6 (diff)
tmpfs: disallow CONFIG_TMPFS_INODE64 on s390
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@canonical.com Fixes: ea3271f7196c ("tmpfs: support 64-bit inums per-sb") Signed-off-by: Seth Forshee <seth.forshee@canonical.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: Chris Down <chris@chrisdown.name> Cc: Hugh Dickins <hughd@google.com> Cc: Amir Goldstein <amir73il@gmail.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: <stable@vger.kernel.org> [5.9+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/Kconfig')
-rw-r--r--fs/Kconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/Kconfig b/fs/Kconfig
index aa4c12282301..3347ec7bd837 100644
--- 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