Merge tag 'configfs-6.2-2022-12-13' of git://git.infradead.org/users/hch/configfs

[linux-2.6-microblaze.git] / include / linux / mnt_idmapping.h

diff --git a/include/linux/mnt_idmapping.h b/include/linux/mnt_idmapping.h
index f6e5369..092c52a 100644 (file)
--- a/include/linux/mnt_idmapping.h
+++ b/include/linux/mnt_idmapping.h
@@ -5,12 +5,10 @@
 #include <linux/types.h>
 #include <linux/uidgid.h>
 
+struct mnt_idmap;
 struct user_namespace;
-/*
- * Carries the initial idmapping of 0:0:4294967295 which is an identity
- * mapping. This means that {g,u}id 0 is mapped to {g,u}id 0, {g,u}id 1 is
- * mapped to {g,u}id 1, [...], {g,u}id 1000 to {g,u}id 1000, [...].
- */
+
+extern struct mnt_idmap nop_mnt_idmap;
 extern struct user_namespace init_user_ns;
 
 typedef struct {
@@ -98,6 +96,26 @@ static inline bool vfsgid_eq_kgid(vfsgid_t vfsgid, kgid_t kgid)
        return vfsgid_valid(vfsgid) && __vfsgid_val(vfsgid) == __kgid_val(kgid);
 }
 
+static inline bool vfsuid_gt_kuid(vfsuid_t vfsuid, kuid_t kuid)
+{
+       return __vfsuid_val(vfsuid) > __kuid_val(kuid);
+}
+
+static inline bool vfsgid_gt_kgid(vfsgid_t vfsgid, kgid_t kgid)
+{
+       return __vfsgid_val(vfsgid) > __kgid_val(kgid);
+}
+
+static inline bool vfsuid_lt_kuid(vfsuid_t vfsuid, kuid_t kuid)
+{
+       return __vfsuid_val(vfsuid) < __kuid_val(kuid);
+}
+
+static inline bool vfsgid_lt_kgid(vfsgid_t vfsgid, kgid_t kgid)
+{
+       return __vfsgid_val(vfsgid) < __kgid_val(kgid);
+}
+
 /*
  * vfs{g,u}ids are created from k{g,u}ids.
  * We don't allow them to be created from regular {u,g}id.
@@ -208,13 +226,6 @@ static inline vfsuid_t make_vfsuid(struct user_namespace *mnt_userns,
        return VFSUIDT_INIT(make_kuid(mnt_userns, uid));
 }
 
-static inline kuid_t mapped_kuid_fs(struct user_namespace *mnt_userns,
-                                   struct user_namespace *fs_userns,
-                                   kuid_t kuid)
-{
-       return AS_KUIDT(make_vfsuid(mnt_userns, fs_userns, kuid));
-}
-
 /**
  * make_vfsgid - map a filesystem kgid into a mnt_userns
  * @mnt_userns: the mount's idmapping
@@ -253,13 +264,6 @@ static inline vfsgid_t make_vfsgid(struct user_namespace *mnt_userns,
        return VFSGIDT_INIT(make_kgid(mnt_userns, gid));
 }
 
-static inline kgid_t mapped_kgid_fs(struct user_namespace *mnt_userns,
-                                   struct user_namespace *fs_userns,
-                                   kgid_t kgid)
-{
-       return AS_KGIDT(make_vfsgid(mnt_userns, fs_userns, kgid));
-}
-
 /**
  * from_vfsuid - map a vfsuid into the filesystem idmapping
  * @mnt_userns: the mount's idmapping
@@ -287,33 +291,6 @@ static inline kuid_t from_vfsuid(struct user_namespace *mnt_userns,
        return make_kuid(fs_userns, uid);
 }
 
-/**
- * mapped_kuid_user - map a user kuid into a mnt_userns
- * @mnt_userns: the mount's idmapping
- * @fs_userns: the filesystem's idmapping
- * @kuid : kuid to be mapped
- *
- * Use the idmapping of @mnt_userns to remap a @kuid into @fs_userns. Use this
- * function when preparing a @kuid to be written to disk or inode.
- *
- * If no_idmapping() determines that this is not an idmapped mount we can
- * simply return @kuid unchanged.
- * If initial_idmapping() tells us that the filesystem is not mounted with an
- * idmapping we know the value of @kuid won't change when calling
- * make_kuid() so we can simply retrieve the value via KUIDT_INIT()
- * directly.
- *
- * Return: @kuid mapped according to @mnt_userns.
- * If @kuid has no mapping in either @mnt_userns or @fs_userns INVALID_UID is
- * returned.
- */
-static inline kuid_t mapped_kuid_user(struct user_namespace *mnt_userns,
-                                     struct user_namespace *fs_userns,
-                                     kuid_t kuid)
-{
-       return from_vfsuid(mnt_userns, fs_userns, VFSUIDT_INIT(kuid));
-}
-
 /**
  * vfsuid_has_fsmapping - check whether a vfsuid maps into the filesystem
  * @mnt_userns: the mount's idmapping
@@ -333,6 +310,12 @@ static inline bool vfsuid_has_fsmapping(struct user_namespace *mnt_userns,
        return uid_valid(from_vfsuid(mnt_userns, fs_userns, vfsuid));
 }
 
+static inline bool vfsuid_has_mapping(struct user_namespace *userns,
+                                     vfsuid_t vfsuid)
+{
+       return from_kuid(userns, AS_KUIDT(vfsuid)) != (uid_t)-1;
+}
+
 /**
  * vfsuid_into_kuid - convert vfsuid into kuid
  * @vfsuid: the vfsuid to convert
@@ -373,33 +356,6 @@ static inline kgid_t from_vfsgid(struct user_namespace *mnt_userns,
        return make_kgid(fs_userns, gid);
 }
 
-/**
- * mapped_kgid_user - map a user kgid into a mnt_userns
- * @mnt_userns: the mount's idmapping
- * @fs_userns: the filesystem's idmapping
- * @kgid : kgid to be mapped
- *
- * Use the idmapping of @mnt_userns to remap a @kgid into @fs_userns. Use this
- * function when preparing a @kgid to be written to disk or inode.
- *
- * If no_idmapping() determines that this is not an idmapped mount we can
- * simply return @kgid unchanged.
- * If initial_idmapping() tells us that the filesystem is not mounted with an
- * idmapping we know the value of @kgid won't change when calling
- * make_kgid() so we can simply retrieve the value via KGIDT_INIT()
- * directly.
- *
- * Return: @kgid mapped according to @mnt_userns.
- * If @kgid has no mapping in either @mnt_userns or @fs_userns INVALID_GID is
- * returned.
- */
-static inline kgid_t mapped_kgid_user(struct user_namespace *mnt_userns,
-                                     struct user_namespace *fs_userns,
-                                     kgid_t kgid)
-{
-       return from_vfsgid(mnt_userns, fs_userns, VFSGIDT_INIT(kgid));
-}
-
 /**
  * vfsgid_has_fsmapping - check whether a vfsgid maps into the filesystem
  * @mnt_userns: the mount's idmapping
@@ -419,6 +375,12 @@ static inline bool vfsgid_has_fsmapping(struct user_namespace *mnt_userns,
        return gid_valid(from_vfsgid(mnt_userns, fs_userns, vfsgid));
 }
 
+static inline bool vfsgid_has_mapping(struct user_namespace *userns,
+                                     vfsgid_t vfsgid)
+{
+       return from_kgid(userns, AS_KGIDT(vfsgid)) != (gid_t)-1;
+}
+
 /**
  * vfsgid_into_kgid - convert vfsgid into kgid
  * @vfsgid: the vfsgid to convert