`EFI_NOT_FOUND` for `btrfs(<...>)` syntax. (some debug info provided).

[Esgariot]

Hi, I'm trying to boot from btrfs subvolume and I'm getting Unable to parse ARC name, along with EFI_NOT_FOUND error code.

my loader entry looks like this:

[Windows]
SystemPath=btrfs(b6abd326-f396-4479-99d2-4a5ca63c7da6)\Windows
Options=/SUBVOL=@win

and here's btrfs check and btrfs subvolume list that match stuff provided above:

• subvolume: ID 272 gen 1173 top level 5 path @win
• uuid: UUID: b6abd326-f396-4479-99d2-4a5ca63c7da6

Additionally, I've built top of master, and added some debug prints here and there, and it goes like this:

1. this is the part that fails in boot.c, with Status being EFI_NOT_FOUND

        // Inside parse_arc_name
        EFI_GUID quibble_guid = EFI_QUIBBLE_PROTOCOL_GUID;
        EFI_HANDLE* handles = NULL;
        UINTN count;
   
        Status = bs->LocateHandleBuffer(ByProtocol, &quibble_guid, NULL, &count, &handles);
        if (EFI_ERROR(Status)) {
            print_string("Unable to parse ARC name, because of EFI_ERROR.\n");
            print_error("Error:", Status);
            return Status;
        }
   

2. After printing calls of almost every function in btrfs.c I get thousands of calls to drv_supported and couple of calls to drv_start, then the TUI with entry selection comes up, after selecting Windows I get

            Unable to parse ARC name, because of EFI_ERROR.
            Error: EFI_NOT_FOUND