Re: BTRFS: could not find root 8

[Goffredo Baroncelli <kreijack@inwind.it>]

On 2015-11-27 23:51, Chris Murphy wrote:
> But from github I'm not finding any indication that systemd enables
> quota. This issue suggests that quota disabled is tolerated.
> https://github.com/systemd/systemd/issues/1809

Looking at the systemd source, it seems that it could enable quota when playing with the "machine":


See src/shared/machine-pool.c:

int setup_machine_directory(uint64_t size, sd_bus_error *error) {
        _cleanup_release_lock_file_ LockFile lock_file = LOCK_FILE_INIT;
        struct loop_info64 info = {
                .lo_flags = LO_FLAGS_AUTOCLEAR,
[...]
        r = check_btrfs();
        if (r < 0)
                return sd_bus_error_set_errnof(error, r, "Failed to determine whether /var/lib/machines is located on btrfs: %m");
        if (r > 0) {
                (void) btrfs_subvol_make_label("/var/lib/machines");

                r = btrfs_quota_enable("/var/lib/machines", true);
[...]

But I was unable to understand if:
- enabling quota is a "per filesystem" attribute or per "subvolume attribute"
- when systemd invokes setup_machine_directory()

Does someone have more information ?

BR


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