From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: [PATCH] overlayfs: move super block magic number to magic.h Date: Wed, 4 Nov 2015 10:59:52 -0800 Message-ID: <20151104105952.7232543a@xeon-e3> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Miklos Szeredi , Hannes Frederic Sowa , Steven Rostedt , Al Viro , linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: linux-unionfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-api@vger.kernel.org The overlayfs file system is not recognized by programs like tail because the magic number is not in standard header location. Move it so that the value will propagate on for the GNU library and utilities. Needs to go in the fstatfs manual page as well. Signed-off-by: Stephen Hemminger --- fs/overlayfs/super.c | 2 -- include/uapi/linux/magic.h | 1 + 2 files changed, 1 insertion(+), 2 deletions(-) diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index e38ee0f..a389675 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -24,8 +24,6 @@ MODULE_AUTHOR("Miklos Szeredi "); MODULE_DESCRIPTION("Overlay filesystem"); MODULE_LICENSE("GPL"); -#define OVERLAYFS_SUPER_MAGIC 0x794c7630 - struct ovl_config { char *lowerdir; char *upperdir; diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h index accb036..63ccb03 100644 --- a/include/uapi/linux/magic.h +++ b/include/uapi/linux/magic.h @@ -31,6 +31,7 @@ #define PSTOREFS_MAGIC 0x6165676C #define EFIVARFS_MAGIC 0xde5e81e4 #define HOSTFS_SUPER_MAGIC 0x00c0ffee +#define OVERLAYFS_SUPER_MAGIC 0x794c7630 #define MINIX_SUPER_MAGIC 0x137F /* minix v1 fs, 14 char names */ #define MINIX_SUPER_MAGIC2 0x138F /* minix v1 fs, 30 char names */ -- 2.1.4