Linus Torvalds 05e6295f7b fs.idmapped.v6.3 ... -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCY+5NlQAKCRCRxhvAZXjc orOaAP9i2h3OJy95nO2Fpde0Bt2UT+oulKCCcGlvXJ8/+TQpyQD/ZQq47gFQ0EAz Br5NxeyGeecAb0lHpFz+CpLGsxMrMwQ= =+BG5 -----END PGP SIGNATURE----- Merge tag 'fs.idmapped.v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping Pull vfs idmapping updates from Christian Brauner: - Last cycle we introduced the dedicated struct mnt_idmap type for mount idmapping and the required infrastucture in 256c8aed2b ("fs: introduce dedicated idmap type for mounts"). As promised in last cycle's pull request message this converts everything to rely on 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 relevant on the mount level. Especially for non-vfs developers without detailed knowledge in this area this was a potential source for bugs. This finishes the conversion. Instead of passing the plain namespace around this updates all places that currently take a pointer to a mnt_userns with a pointer to struct mnt_idmap. Now that the conversion is done all helpers down to the really low-level helpers only accept a struct mnt_idmap argument instead of two namespace arguments. Conflating mount and other idmappings will now cause the compiler to complain loudly thus eliminating the possibility of any bugs. This makes it impossible for filesystem developers to mix up mount and filesystem idmappings as they are two distinct types and require distinct helpers that cannot be used interchangeably. Everything associated with struct mnt_idmap is moved into a single separate file. With that change no code can poke around in struct mnt_idmap. It can only be interacted with through dedicated helpers. That means all filesystems are and all of the vfs is completely oblivious to the actual implementation of idmappings. We are now also able to extend struct mnt_idmap as we see fit. For example, we can decouple it completely from namespaces for users that don't require or don't want to use them at all. We can also extend the concept of idmappings so we can cover filesystem specific requirements. In combination with the vfs{g,u}id_t work we finished in v6.2 this makes this feature substantially more robust and thus difficult to implement wrong by a given filesystem and also protects the vfs. - Enable idmapped mounts for tmpfs and fulfill a longstanding request. A long-standing request from users had been to make it possible to create idmapped mounts for tmpfs. For example, to share the host's tmpfs mount between multiple sandboxes. This is a prerequisite for some advanced Kubernetes cases. Systemd also has a range of use-cases to increase service isolation. And there are more users of this. However, with all of the other work going on this was way down on the priority list but luckily someone other than ourselves picked this up. As usual the patch is tiny as all the infrastructure work had been done multiple kernel releases ago. In addition to all the tests that we already have I requested that Rodrigo add a dedicated tmpfs testsuite for idmapped mounts to xfstests. It is to be included into xfstests during the v6.3 development cycle. This should add a slew of additional tests. * tag 'fs.idmapped.v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping: (26 commits) shmem: support idmapped mounts for tmpfs fs: move mnt_idmap fs: port vfs{g,u}id helpers to mnt_idmap fs: port fs{g,u}id helpers to mnt_idmap fs: port i_{g,u}id_into_vfs{g,u}id() to mnt_idmap fs: port i_{g,u}id_{needs_}update() to mnt_idmap quota: port to mnt_idmap fs: port privilege checking helpers to mnt_idmap fs: port inode_owner_or_capable() to mnt_idmap fs: port inode_init_owner() to mnt_idmap fs: port acl to mnt_idmap fs: port xattr to mnt_idmap fs: port ->permission() to pass mnt_idmap fs: port ->fileattr_set() to pass mnt_idmap fs: port ->set_acl() to pass mnt_idmap fs: port ->get_acl() to pass mnt_idmap fs: port ->tmpfile() to pass mnt_idmap fs: port ->rename() to pass mnt_idmap fs: port ->mknod() to pass mnt_idmap fs: port ->mkdir() to pass mnt_idmap ...		2023-02-20 11:53:11 -08:00
..
acl.c	fs.idmapped.v6.3	2023-02-20 11:53:11 -08:00
control.c	fuse: Remove the control interface for virtio-fs	2022-07-21 16:06:19 +02:00
cuse.c	fuse: remove the unneeded result variable	2022-11-23 09:10:49 +01:00
dax.c	fuse: avoid unnecessary spinlock bump	2022-07-21 16:02:45 +02:00
dev.c	MM patches for 6.2-rc1.	2022-12-13 19:29:45 -08:00
dir.c	fs.idmapped.v6.3	2023-02-20 11:53:11 -08:00
file.c	fs.idmapped.v6.3	2023-02-20 11:53:11 -08:00
fuse_i.h	fs.idmapped.v6.3	2023-02-20 11:53:11 -08:00
inode.c	fuse: fixes after adapting to new posix acl api	2023-01-24 16:33:37 +01:00
ioctl.c	fs: port ->fileattr_set() to pass mnt_idmap	2023-01-19 09:24:27 +01:00
Kconfig	dax: remove CONFIG_DAX_DRIVER	2021-12-04 08:58:51 -08:00
Makefile	fuse: move ioctl to separate source file	2021-04-12 15:04:30 +02:00
readdir.c	fs/fuse: Replace kmap() with kmap_local_page()	2022-11-23 09:10:49 +01:00
virtio_fs.c	virtio_fs: Modify format for virtio_fs_direct_access	2022-07-26 10:38:58 +02:00
xattr.c	fs.idmapped.v6.3	2023-02-20 11:53:11 -08:00