userns: Store uid and gid types in vfs structures with kuid_t and kgid_t types

The conversion of all of the users is not done yet there are too many to change
in one go and leave the code reviewable. For now I change just the header and
a few trivial users and rely on CONFIG_UIDGID_STRICT_TYPE_CHECKS not being set
to ensure that the code will still compile during the transition.

Helper functions i_uid_read, i_uid_write, i_gid_read, i_gid_write are added
so that in most cases filesystems can avoid the complexities of multiple user
namespaces and can concentrate on moving their raw numeric values into and
out of the vfs data structures.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

1 files changed, 31 insertions, 5 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index a6c5efbee0d7..797eb262d9f1 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -402,6 +402,7 @@ struct inodes_stat_t {
 #include <linux/atomic.h>
 #include <linux/shrinker.h>
 #include <linux/migrate_mode.h>
+#include <linux/uidgid.h>
 
 #include <asm/byteorder.h>
 
@@ -469,8 +470,8 @@ typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
 struct iattr {
         unsigned int    ia_valid;
         umode_t         ia_mode;
-        uid_t           ia_uid;
-        gid_t           ia_gid;
+        kuid_t          ia_uid;
+        kgid_t          ia_gid;
         loff_t          ia_size;
         struct timespec ia_atime;
         struct timespec ia_mtime;
@@ -761,8 +762,8 @@ struct posix_acl;
 struct inode {
         umode_t                 i_mode;
         unsigned short          i_opflags;
-        uid_t                   i_uid;
-        gid_t                   i_gid;
+        kuid_t                  i_uid;
+        kgid_t                  i_gid;
         unsigned int            i_flags;
 
 #ifdef CONFIG_FS_POSIX_ACL
@@ -927,6 +928,31 @@ static inline void i_size_write(struct inode *inode, loff_t i_size)
 #endif
 }
 
+/* Helper functions so that in most cases filesystems will
+ * not need to deal directly with kuid_t and kgid_t and can
+ * instead deal with the raw numeric values that are stored
+ * in the filesystem.
+ */
+static inline uid_t i_uid_read(const struct inode *inode)
+{
+        return from_kuid(&init_user_ns, inode->i_uid);
+}
+
+static inline gid_t i_gid_read(const struct inode *inode)
+{
+        return from_kgid(&init_user_ns, inode->i_gid);
+}
+
+static inline void i_uid_write(struct inode *inode, uid_t uid)
+{
+        inode->i_uid = make_kuid(&init_user_ns, uid);
+}
+
+static inline void i_gid_write(struct inode *inode, gid_t gid)
+{
+        inode->i_gid = make_kgid(&init_user_ns, gid);
+}
+
 static inline unsigned iminor(const struct inode *inode)
 {
         return MINOR(inode->i_rdev);
@@ -943,7 +969,7 @@ struct fown_struct {
         rwlock_t lock;          /* protects pid, uid, euid fields */
         struct pid *pid;        /* pid or -pgrp where SIGIO should be sent */
         enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
-        uid_t uid, euid;        /* uid/euid of process setting the owner */
+        kuid_t uid, euid;       /* uid/euid of process setting the owner */
         int signum;             /* posix.1b rt signal to be delivered on IO */
 };