On Tue, Oct 31, 2023 at 01:50:46PM +0100, Christian Brauner wrote: > So this is effectively a request for: > > btrfs subvolume create /mnt/subvol1 > > to create vfsmounts? IOW, > > mkfs.btrfs /dev/sda > mount /dev/sda /mnt > btrfs subvolume create /mnt/subvol1 > btrfs subvolume create /mnt/subvol2 > > would create two new vfsmounts that are exposed in /proc/<pid>/mountinfo > afterwards? Yes. > That might be odd. Because these vfsmounts aren't really mounted, no? Why aren't they? > And so you'd be showing potentially hundreds of mounts in > /proc/<pid>/mountinfo that you can't unmount? Why would you not allow them to be unmounted? > And even if you treat them as mounted what would unmounting mean? The code in btrfs_lookup_dentry that does a hand crafted version of the file system / subvolume crossing (the location.type != BTRFS_INODE_ITEM_KEY one) would not be executed.
