userns: pass const uid_gid_map in lookup helpers

map_id_down(), map_id_up() and map_id_range_up() search the extents
of an idmapping and never modify it. Let all relevant helpers pass a
const struct uid_gid_map. Callers can now pass pass struct mnt_idmap as
const and pass down &idmap->uid_map and &idmap->gid_map.

No functional changes.

Link: https://patch.msgid.link/20260901-work-idmap-const-v1-1-54ccd48e100b@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Seth Forshee <sforshee@kernel.org>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/include/linux/uidgid.h b/include/linux/uidgid.h
index 2dc767e08f54..02403629b49f 100644
--- a/include/linux/uidgid.h
+++ b/include/linux/uidgid.h
@@ -130,9 +130,9 @@ static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid)
 	return from_kgid(ns, gid) != (gid_t) -1;
 }
 
-u32 map_id_down(struct uid_gid_map *map, u32 id);
-u32 map_id_up(struct uid_gid_map *map, u32 id);
-u32 map_id_range_up(struct uid_gid_map *map, u32 id, u32 count);
+u32 map_id_down(const struct uid_gid_map *map, u32 id);
+u32 map_id_up(const struct uid_gid_map *map, u32 id);
+u32 map_id_range_up(const struct uid_gid_map *map, u32 id, u32 count);
 
 #else
 
@@ -182,17 +182,17 @@ static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid)
 	return gid_valid(gid);
 }
 
-static inline u32 map_id_down(struct uid_gid_map *map, u32 id)
+static inline u32 map_id_down(const struct uid_gid_map *map, u32 id)
 {
 	return id;
 }
 
-static inline u32 map_id_range_up(struct uid_gid_map *map, u32 id, u32 count)
+static inline u32 map_id_range_up(const struct uid_gid_map *map, u32 id, u32 count)
 {
 	return id;
 }
 
-static inline u32 map_id_up(struct uid_gid_map *map, u32 id)
+static inline u32 map_id_up(const struct uid_gid_map *map, u32 id)
 {
 	return id;
 }