userns: Convert ntfs to use kuid and kgid where appropriate

Cc: Anton Altaparmakov <[e-mail]>
Acked-by: Serge Hallyn <[e-mail]>
Signed-off-by: Eric W. Biederman <[e-mail]>

fs/ntfs/inode.c

···
 			 * ntfs_read_inode() will have set up the default ones.
 			 */
 			/* Set uid and gid to root. */
-			vi->i_uid = vi->i_gid = 0;
+			vi->i_uid = GLOBAL_ROOT_UID;
+			vi->i_gid = GLOBAL_ROOT_GID;
 			/* Regular file. No access for anyone. */
 			vi->i_mode = S_IFREG;
 			/* No VFS initiated operations allowed for $MFT. */
···
 	ntfs_volume *vol = NTFS_SB(root->d_sb);
 	int i;
 
-	seq_printf(sf, ",uid=%i", vol->uid);
-	seq_printf(sf, ",gid=%i", vol->gid);
+	seq_printf(sf, ",uid=%i", from_kuid_munged(&init_user_ns, vol->uid));
+	seq_printf(sf, ",gid=%i", from_kgid_munged(&init_user_ns, vol->gid));
 	if (vol->fmask == vol->dmask)
 		seq_printf(sf, ",umask=0%o", vol->fmask);
 	else {

fs/ntfs/super.c

···
 	char *p, *v, *ov;
 	static char *utf8 = "utf8";
 	int errors = 0, sloppy = 0;
-	uid_t uid = (uid_t)-1;
-	gid_t gid = (gid_t)-1;
+	kuid_t uid = INVALID_UID;
+	kgid_t gid = INVALID_GID;
 	umode_t fmask = (umode_t)-1, dmask = (umode_t)-1;
 	int mft_zone_multiplier = -1, on_errors = -1;
 	int show_sys_files = -1, case_sensitive = -1, disable_sparse = -1;
···
 			goto needs_arg;					\
 		variable = simple_strtoul(ov = v, &v, 0);		\
 		if (*v)							\
+			goto needs_val;					\
+	}
+#define NTFS_GETOPT_UID(option, variable)				\
+	if (!strcmp(p, option)) {					\
+		uid_t uid_value;					\
+		if (!v || !*v)						\
+			goto needs_arg;					\
+		uid_value = simple_strtoul(ov = v, &v, 0);		\
+		if (*v)							\
+			goto needs_val;					\
+		variable = make_kuid(current_user_ns(), uid_value);	\
+		if (!uid_valid(variable))				\
+			goto needs_val;					\
+	}
+#define NTFS_GETOPT_GID(option, variable)				\
+	if (!strcmp(p, option)) {					\
+		gid_t gid_value;					\
+		if (!v || !*v)						\
+			goto needs_arg;					\
+		gid_value = simple_strtoul(ov = v, &v, 0);		\
+		if (*v)							\
+			goto needs_val;					\
+		variable = make_kgid(current_user_ns(), gid_value);	\
+		if (!gid_valid(variable))				\
 			goto needs_val;					\
 	}
 #define NTFS_GETOPT_OCTAL(option, variable)				\
···
 	while ((p = strsep(&opt, ","))) {
 		if ((v = strchr(p, '=')))
 			*v++ = 0;
-		NTFS_GETOPT("uid", uid)
-		else NTFS_GETOPT("gid", gid)
+		NTFS_GETOPT_UID("uid", uid)
+		else NTFS_GETOPT_GID("gid", gid)
 		else NTFS_GETOPT_OCTAL("umask", fmask = dmask)
 		else NTFS_GETOPT_OCTAL("fmask", fmask)
 		else NTFS_GETOPT_OCTAL("dmask", dmask)
···
 		vol->on_errors = on_errors;
 	if (!vol->on_errors || vol->on_errors == ON_ERRORS_RECOVER)
 		vol->on_errors |= ON_ERRORS_CONTINUE;
-	if (uid != (uid_t)-1)
+	if (uid_valid(uid))
 		vol->uid = uid;
-	if (gid != (gid_t)-1)
+	if (gid_valid(gid))
 		vol->gid = gid;
 	if (fmask != (umode_t)-1)
 		vol->fmask = fmask;
···
 	 * ntfs_read_inode() will have set up the default ones.
 	 */
 	/* Set uid and gid to root. */
-	tmp_ino->i_uid = tmp_ino->i_gid = 0;
+	tmp_ino->i_uid = GLOBAL_ROOT_UID;
+	tmp_ino->i_gid = GLOBAL_ROOT_GID;
 	/* Regular file.  No access for anyone. */
 	tmp_ino->i_mode = S_IFREG;
 	/* No VFS initiated operations allowed for $MFTMirr. */

fs/ntfs/volume.h

···
 #define _LINUX_NTFS_VOLUME_H
 
 #include <linux/rwsem.h>
+#include <linux/uidgid.h>
 
 #include "types.h"
 #include "layout.h"
···
 					   sized blocks on the device. */
 	/* Configuration provided by user at mount time. */
 	unsigned long flags;		/* Miscellaneous flags, see below. */
-	uid_t uid;			/* uid that files will be mounted as. */
-	gid_t gid;			/* gid that files will be mounted as. */
+	kuid_t uid;			/* uid that files will be mounted as. */
+	kgid_t gid;			/* gid that files will be mounted as. */
 	umode_t fmask;			/* The mask for file permissions. */
 	umode_t dmask;			/* The mask for directory
 					   permissions. */

init/Kconfig

···
 	depends on NCP_FS = n
 	depends on NFSD = n
 	depends on NFS_FS = n
-	depends on NTFS_FS = n
 	depends on OCFS2_FS = n
 	depends on OMFS_FS = n
 	depends on QNX4FS_FS = n