ext4: sysfs: print ext4_super_block fields as little-endian
authorArnd Bergmann <arnd@arndb.de>
Sun, 29 Jul 2018 19:48:00 +0000 (15:48 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 5 Sep 2018 07:26:36 +0000 (09:26 +0200)
commit5043e05dd571ebdc22ff39724ff1da7de2945d49
treef76c65457907583a736f616ad9aaf0f6163bdba3
parent7773a6d94896d168f3430e541f31f85ce0e9a8f4
ext4: sysfs: print ext4_super_block fields as little-endian

commit a4d2aadca184ece182418950d45ba4ffc7b652d2 upstream.

While working on extended rand for last_error/first_error timestamps,
I noticed that the endianess is wrong; we access the little-endian
fields in struct ext4_super_block as native-endian when we print them.

This adds a special case in ext4_attr_show() and ext4_attr_store()
to byteswap the superblock fields if needed.

In older kernels, this code was part of super.c, it got moved to
sysfs.c in linux-4.4.

Cc: stable@vger.kernel.org
Fixes: 52c198c6820f ("ext4: add sysfs entry showing whether the fs contains errors")
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/ext4/sysfs.c