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btrfs: allow idmapped SUBVOL_SETFLAGS ioctl

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Setting flags on subvolumes or snapshots are core features of btrfs. The
SUBVOL_SETFLAGS ioctl is especially important as it allows to make
subvolumes and snapshots read-only or read-write. Allow setting flags on
btrfs subvolumes and snapshots 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>
This commit is contained in:
Christian Brauner 2021-07-27 12:48:56 +02:00 committed by David Sterba
parent e4fed17a32
commit 39e1674ff0
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/ioctl.c
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@ -1988,7 +1988,7 @@ static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
u64 flags;
int ret = 0;
if (!inode_owner_or_capable(&init_user_ns, inode))
if (!inode_owner_or_capable(file_mnt_user_ns(file), inode))
return -EPERM;
ret = mnt_want_write_file(file);