linux-kernel - [PATCH 1/2] fs/fuse: move SUPER_MAGIC definitions to linux/magic.h

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Message-Id: <5aa0e3c3a8d67939940b3469fdae81b9f1a0f920.1515682581.git.dongsu@kinvolk.io>
Date:   Thu, 11 Jan 2018 20:51:49 +0100
From:   Dongsu Park <dongsu@...volk.io>
To:     linux-kernel@...r.kernel.org
Cc:     Alban Crequy <alban@...volk.io>,
        Miklos Szeredi <miklos@...redi.hu>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Seth Forshee <seth.forshee@...onical.com>,
        Dongsu Park <dongsu@...volk.io>, linux-fsdevel@...r.kernel.org,
        linux-integrity@...r.kernel.org
Subject: [PATCH 1/2] fs/fuse: move SUPER_MAGIC definitions to linux/magic.h

To be able to use FUSE_*SUPER_MAGIC macros in other subsystems like
security/integrity/ima, we need to move the definitions from fs/fuse
to include/uapi/linux/.

The FUSE_*SUPER_MAGIC macros are made available to userspace in the
same way as other filesystems.

Cc: linux-fsdevel@...r.kernel.org
Cc: linux-integrity@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: Alban Crequy <alban@...volk.io>
Cc: Miklos Szeredi <miklos@...redi.hu>
Cc: Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc: Seth Forshee <seth.forshee@...onical.com>
Signed-off-by: Dongsu Park <dongsu@...volk.io>
---
 fs/fuse/control.c          | 3 +--
 fs/fuse/inode.c            | 3 +--
 include/uapi/linux/magic.h | 3 +++
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index b9ea99c5..9015c15c 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -10,8 +10,7 @@
 
 #include <linux/init.h>
 #include <linux/module.h>
-
-#define FUSE_CTL_SUPER_MAGIC 0x65735543
+#include <linux/magic.h>
 
 /*
  * This is non-NULL when the single instance of the control filesystem
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 8c98edee..57371b77 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -22,6 +22,7 @@
 #include <linux/exportfs.h>
 #include <linux/posix_acl.h>
 #include <linux/pid_namespace.h>
+#include <linux/magic.h>
 
 MODULE_AUTHOR("Miklos Szeredi <miklos@...redi.hu>");
 MODULE_DESCRIPTION("Filesystem in Userspace");
@@ -49,8 +50,6 @@ MODULE_PARM_DESC(max_user_congthresh,
  "Global limit for the maximum congestion threshold an "
  "unprivileged user can set");
 
-#define FUSE_SUPER_MAGIC 0x65735546
-
 #define FUSE_DEFAULT_BLKSIZE 512
 
 /** Maximum number of outstanding background requests */
diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h
index 1a6fee97..1534e99c 100644
--- a/include/uapi/linux/magic.h
+++ b/include/uapi/linux/magic.h
@@ -90,4 +90,7 @@
 #define BALLOON_KVM_MAGIC	0x13661366
 #define ZSMALLOC_MAGIC		0x58295829
 
+#define FUSE_CTL_SUPER_MAGIC	0x65735543
+#define FUSE_SUPER_MAGIC	0x65735546
+
 #endif /* __LINUX_MAGIC_H__ */
-- 
2.13.6