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SubjectRe: [PATCH] hugetlbfs: publish HUGETLBFS_MAGIC via linux/magic.h
nick black left as an exercise for the reader:
> Pekka Enberg left as an exercise for the reader:
> > Hi Nick,
> > This looks good to me as well but it should be a separate patch as the
> > change has nothing to do with hugetlbfs. While at it, you should
> > probably move SOCKFS_MAGIC and DEVPTS_SUPER_MAGIC to <linux/magic.h>
> > and remove the definitions from smack.
> Thanks for the review, Pekka, and I couldn't agree more. Here's a second
> version of the patch, a rather more equal-opportunity unification
> of magic numbers (I'll resend with a new Subject if that's preferred):

Ahh, I realize you want two patches. Here's the minimal hugetlbfs patch;
I'll send the magic number unification as another thread. My worry there is
whether SOCKFS_MAGIC and DEVPTS_SUPER_MAGIC ought be exposed to userspace --
[f]statfs(2)'s manpage makes it clear that HUGETLBFS_MAGIC is to be visible.

[f]statfs(2) *does* refer to DEVFS_SUPER_MAGIC, which doesn't exist anywhere
in the 2.6.31-rc1 tree. A typo, or legacy cruft from the devfs of yesteryear?
Either way, that doesn't answer whether SOCKFS_ ought be exported.

Thanks very much for the feedback!

Signed-off-by: Nick Black <>
diff -uprN -X linux-2.6.31-rc1-pristine/Documentation/dontdiff linux-2.6.31-rc1-pristine/fs/hugetlbfs/inode.c linux-2.6.31-rc1/fs/hugetlbfs/inode.c
--- linux-2.6.31-rc1-pristine/fs/hugetlbfs/inode.c 2009-06-24 19:25:37.000000000 -0400
+++ linux-2.6.31-rc1/fs/hugetlbfs/inode.c 2009-06-29 07:52:43.000000000 -0400
@@ -31,12 +31,10 @@
#include <linux/statfs.h>
#include <linux/security.h>
#include <linux/ima.h>
+#include <linux/magic.h>

#include <asm/uaccess.h>

-/* some random number */
-#define HUGETLBFS_MAGIC 0x958458f6
static const struct super_operations hugetlbfs_ops;
static const struct address_space_operations hugetlbfs_aops;
const struct file_operations hugetlbfs_file_operations;
diff -uprN -X linux-2.6.31-rc1-pristine/Documentation/dontdiff linux-2.6.31-rc1-pristine/include/linux/magic.h linux-2.6.31-rc1/include/linux/magic.h
--- linux-2.6.31-rc1-pristine/include/linux/magic.h 2009-06-24 19:25:37.000000000 -0400
+++ linux-2.6.31-rc1/include/linux/magic.h 2009-06-29 08:55:57.000000000 -0400
@@ -13,6 +13,7 @@
#define SECURITYFS_MAGIC 0x73636673
#define SELINUX_MAGIC 0xf97cff8c
#define TMPFS_MAGIC 0x01021994
+#define HUGETLBFS_MAGIC 0x958458f6 /* some random number */
#define SQUASHFS_MAGIC 0x73717368
#define EFS_SUPER_MAGIC 0x414A53
#define EXT2_SUPER_MAGIC 0xEF53
Nick Black <>
Principal Engineer, McAfee
Grad student, GT College of Computing
"np: the class of dashed hopes, and idle dreams..."
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