[PATCH] fat: port to vfs{g,u}id_t and associated helpers

[Christian Brauner <brauner@kernel.org>]

A while ago we introduced a dedicated vfs{g,u}id_t type in commit
1e5267cd0895 ("mnt_idmapping: add vfs{g,u}id_t"). We already switched
over a good part of the VFS. Ultimately we will remove all legacy
idmapped mount helpers that operate only on k{g,u}id_t in favor of the
new type safe helpers that operate on vfs{g,u}id_t.

Cc: Seth Forshee (Digital Ocean) <sforshee@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
---
 fs/fat/file.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/fat/file.c b/fs/fat/file.c
index 3e4eb3467cb4..8a6b493b5b5f 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -461,8 +461,9 @@ static int fat_allow_set_time(struct user_namespace *mnt_userns,
 {
 	umode_t allow_utime = sbi->options.allow_utime;
 
-	if (!uid_eq(current_fsuid(), i_uid_into_mnt(mnt_userns, inode))) {
-		if (in_group_p(i_gid_into_mnt(mnt_userns, inode)))
+	if (!vfsuid_eq_kuid(i_uid_into_vfsuid(mnt_userns, inode),
+			    current_fsuid())) {
+		if (vfsgid_in_group_p(i_gid_into_vfsgid(mnt_userns, inode)))
 			allow_utime >>= 3;
 		if (allow_utime & MAY_WRITE)
 			return 1;

base-commit: 7e18e42e4b280c85b76967a9106a13ca61c16179
-- 
2.34.1