> >Also in https://btrfs.wiki.kernel.org/index.php/Mount_options
> >"user_subvol_rm_allowed (...) Use with caution."
> >
> >Why? What is the problem?
>
> Because with the mount option any user can delete any subvolume,
> including root one (subvol_id=5)
Apologies, it works somewhat different:
filesystem doesn't allow to delete subvolume with id 5 and POSIX access
is checked before deleting subvolume with user_subvol_rm_allowed mount
option.
From btrfs-progs cmds-subvolume.c:
res = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args);
if(res < 0 ){
error("cannot delete '%s/%s': %s", dname, vname,
strerror(errno));
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