[PATCH v4 1/7] xfs: create wrappers for converting kuid_t to/from uid_t

[PATCH v4 1/7] xfs: create wrappers for converting kuid_t to/from uid_t

[Dwight Engen]

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
---
 fs/xfs/xfs_linux.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index 800f896..761e4c0 100644
--- a/fs/xfs/xfs_linux.h
+++ b/fs/xfs/xfs_linux.h
@@ -159,6 +159,32 @@
 #define MAX(a,b)	(max(a,b))
 #define howmany(x, y)	(((x)+((y)-1))/(y))
 
+/* Kernel uid/gid conversion. These are used to convert to/from the on disk
+ * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally.
+ * The conversion here is type only, the value will remain the same since we
+ * are converting to the init_user_ns. The uid is later mapped to a particular
+ * user namespace value when crossing the kernel/user boundary.
+ */
+static inline __uint32_t xfs_kuid_to_uid(kuid_t uid)
+{
+	return from_kuid(&init_user_ns, uid);
+}
+
+static inline kuid_t xfs_uid_to_kuid(__uint32_t uid)
+{
+	return make_kuid(&init_user_ns, uid);
+}
+
+static inline __uint32_t xfs_kgid_to_gid(kgid_t gid)
+{
+	return from_kgid(&init_user_ns, gid);
+}
+
+static inline kgid_t xfs_gid_to_kgid(__uint32_t gid)
+{
+	return make_kgid(&init_user_ns, gid);
+}
+
 /*
  * Various platform dependent calls that don't fit anywhere else
  */
-- 
1.8.1.4

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Re: [PATCH v4 1/7] xfs: create wrappers for converting kuid_t to/from uid_t

[Dave Chinner]

On Wed, Jul 17, 2013 at 11:47:14AM -0400, Dwight Engen wrote:
> Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
> ---
>  fs/xfs/xfs_linux.h | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
> index 800f896..761e4c0 100644
> --- a/fs/xfs/xfs_linux.h
> +++ b/fs/xfs/xfs_linux.h
> @@ -159,6 +159,32 @@
>  #define MAX(a,b)	(max(a,b))
>  #define howmany(x, y)	(((x)+((y)-1))/(y))
>  
> +/* Kernel uid/gid conversion. These are used to convert to/from the on disk
> + * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally.
> + * The conversion here is type only, the value will remain the same since we
> + * are converting to the init_user_ns. The uid is later mapped to a particular
> + * user namespace value when crossing the kernel/user boundary.
> + */
> +static inline __uint32_t xfs_kuid_to_uid(kuid_t uid)
> +{
> +	return from_kuid(&init_user_ns, uid);
> +}
> +
> +static inline kuid_t xfs_uid_to_kuid(__uint32_t uid)
> +{
> +	return make_kuid(&init_user_ns, uid);
> +}
> +
> +static inline __uint32_t xfs_kgid_to_gid(kgid_t gid)
> +{
> +	return from_kgid(&init_user_ns, gid);
> +}
> +
> +static inline kgid_t xfs_gid_to_kgid(__uint32_t gid)
> +{
> +	return make_kgid(&init_user_ns, gid);
> +}

Looks good.

Reviewed-by: Dave Chinner <dchinner@redhat.com>

-- 
Dave Chinner
david@fromorbit.com

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