btrfs: allow idmapped SNAP_CREATE/SUBVOL_CREATE ioctls

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Creating subvolumes and snapshots is one of the core features of btrfs
and is even available to unprivileged users. Make it possible to use
subvolume and snapshot creation on idmapped mounts. This is a fairly
straightforward operation since all the permission checking helpers are
already capable of handling idmapped mounts. So we just need to pass
down the mount's userns.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Christian Brauner 2021-07-27 12:48:52 +02:00 • committed by David Sterba

parent 5474bf400f

commit 4d4340c912

3 changed files with 32 additions and 23 deletions

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3

fs/btrfs/ctree.h

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5

fs/btrfs/inode.c

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47

fs/btrfs/ioctl.c

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