linux-kernel - [PATCH 2/4] integrity: special fs magic

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Date:	Tue,  7 Oct 2008 14:00:12 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	James Morris <jmorris@...ei.org>,
	Christoph Hellwig <hch@...radead.org>,
	David Safford <safford@...son.ibm.com>,
	Serge Hallyn <serue@...ux.vnet.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: [PATCH 2/4] integrity: special fs magic

Discussion on the mailing list questioned the use of these
magic values in userspace, concluding these values are already
exported to userspace via statfs and their correct/incorrect
usage is left up to the userspace application.

  - Move special fs magic number definitions to magic.h
  - Add magic.h include

Signed-off-by: Mimi Zohar <zohar@...ibm.com>
Reviewed-by: James Morris <jmorris@...ei.org>
---
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 08e28c9..3dbe216 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -26,8 +26,7 @@
 #include <linux/debugfs.h>
 #include <linux/fsnotify.h>
 #include <linux/string.h>
-
-#define DEBUGFS_MAGIC	0x64626720
+#include <linux/magic.h>
 
 static struct vfsmount *debugfs_mount;
 static int debugfs_mount_count;
diff --git a/include/linux/magic.h b/include/linux/magic.h
index 1fa0c2c..f7f3fdd 100644
--- a/include/linux/magic.h
+++ b/include/linux/magic.h
@@ -6,6 +6,10 @@
 #define AFS_SUPER_MAGIC                0x5346414F
 #define AUTOFS_SUPER_MAGIC	0x0187
 #define CODA_SUPER_MAGIC	0x73757245
+#define DEBUGFS_MAGIC          0x64626720
+#define SYSFS_MAGIC		0x62656572
+#define SECURITYFS_MAGIC	0x73636673
+#define TMPFS_MAGIC		0x01021994
 #define EFS_SUPER_MAGIC		0x414A53
 #define EXT2_SUPER_MAGIC	0xEF53
 #define EXT3_SUPER_MAGIC	0xEF53
diff --git a/mm/shmem.c b/mm/shmem.c
index c1e5a3b..c4e63c4 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -50,14 +50,12 @@
 #include <linux/migrate.h>
 #include <linux/highmem.h>
 #include <linux/seq_file.h>
+#include <linux/magic.h>
 
 #include <asm/uaccess.h>
 #include <asm/div64.h>
 #include <asm/pgtable.h>
 
-/* This magic number is used in glibc for posix shared memory */
-#define TMPFS_MAGIC	0x01021994
-
 #define ENTRIES_PER_PAGE (PAGE_CACHE_SIZE/sizeof(unsigned long))
 #define ENTRIES_PER_PAGEPAGE (ENTRIES_PER_PAGE*ENTRIES_PER_PAGE)
 #define BLOCKS_PER_PAGE  (PAGE_CACHE_SIZE/512)
diff --git a/security/inode.c b/security/inode.c
index acc6cf0..b66df8e 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -20,8 +20,7 @@
 #include <linux/init.h>
 #include <linux/namei.h>
 #include <linux/security.h>
-
-#define SECURITYFS_MAGIC	0x73636673
+#include <linux/magic.h>
 
 static struct vfsmount *mount;
 static int mount_count;
-- 
1.5.5.1

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