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authorChristian Brauner <brauner@kernel.org>2023-01-13 14:49:30 +0300
committerChristian Brauner (Microsoft) <brauner@kernel.org>2023-01-19 11:24:29 +0300
commite67fe63341b8117d7e0d9acf0f1222d5138b9266 (patch)
treebff98b058b122ca18afb6e97a61a420804443eaa /fs/namespace.c
parent0dbe12f2e49c046444461b5f4be49df2cafb3a40 (diff)
downloadlinux-e67fe63341b8117d7e0d9acf0f1222d5138b9266.tar.xz
fs: port i_{g,u}id_into_vfs{g,u}id() to mnt_idmap
Convert to struct mnt_idmap. Remove legacy file_mnt_user_ns() and mnt_user_ns(). Last cycle we merged the necessary infrastructure in 256c8aed2b42 ("fs: introduce dedicated idmap type for mounts"). This is just the conversion to struct mnt_idmap. Currently we still pass around the plain namespace that was attached to a mount. This is in general pretty convenient but it makes it easy to conflate namespaces that are relevant on the filesystem with namespaces that are relevent on the mount level. Especially for non-vfs developers without detailed knowledge in this area this can be a potential source for bugs. Once the conversion to struct mnt_idmap is done all helpers down to the really low-level helpers will take a struct mnt_idmap argument instead of two namespace arguments. This way it becomes impossible to conflate the two eliminating the possibility of any bugs. All of the vfs and all filesystems only operate on struct mnt_idmap. Acked-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Diffstat (limited to 'fs/namespace.c')
-rw-r--r--fs/namespace.c26
1 files changed, 0 insertions, 26 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index ab467ee58341..b7a2af5c896e 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -231,32 +231,6 @@ struct user_namespace *mnt_idmap_owner(const struct mnt_idmap *idmap)
EXPORT_SYMBOL_GPL(mnt_idmap_owner);
/**
- * mnt_user_ns - retrieve owner of an idmapped mount
- * @mnt: the relevant vfsmount
- *
- * This helper will go away once the conversion to use struct mnt_idmap
- * everywhere has finished at which point the helper will be unexported.
- *
- * Only code that needs to perform permission checks based on the owner of the
- * idmapping will get access to it. All other code will solely rely on
- * idmappings. This will get us type safety so it's impossible to conflate
- * filesystems idmappings with mount idmappings.
- *
- * Return: The owner of the idmapped.
- */
-struct user_namespace *mnt_user_ns(const struct vfsmount *mnt)
-{
- struct mnt_idmap *idmap = mnt_idmap(mnt);
-
- /* Return the actual owner of the filesystem instead of the nop. */
- if (idmap == &nop_mnt_idmap &&
- !initial_idmapping(mnt->mnt_sb->s_user_ns))
- return mnt->mnt_sb->s_user_ns;
- return mnt_idmap_owner(idmap);
-}
-EXPORT_SYMBOL_GPL(mnt_user_ns);
-
-/**
* alloc_mnt_idmap - allocate a new idmapping for the mount
* @mnt_userns: owning userns of the idmapping
*