[PATCH V3] Add support for BTRFS raid5/6 to GRUB

[Goffredo Baroncelli]

I was wrong this is the V3 patches set ; the subject is wrong. Sorry for the 
inconvenient.

On 05/11/2018 09:24 PM, Goffredo Baroncelli wrote:
> Hi All,
> 
> the aim of this patches set is to provide support for a BTRFS raid5/6
> filesystem in GRUB.
> 
> The first patch, implements the basic support for raid5/6. I.e this works when
> all the disks are present.
> 
> The next 4 patches, are preparatory ones.
> 
> The 6th patch implements the raid5 recovery for btrfs (i.e. handling the
> disappearing of 1 disk).
> The 7th patch makes the code for handling the raid6 recovery more generic.
> The last one implements the raid6 recovery for btrfs (i.e. handling the
> disappearing up to two disks).
> 
> I tested the code in grub-emu, and it works (for me) both with all the disks,
> and with some disks missing. I checked the crc32 calculated from grub and
> from linux and these matched. Finally I checked if the support for md raid6 
> still works properly, and it does (with all the drives and with up to 2 drives
> missing)
> 
> Comments are welcome.
> 
> Changelog
> v1: initial support for btrfs raid5/6. No recovery allowed
> v2: full support for btrfs raid5/6. Recovery allowed
> v3: some minor cleanup suggested by Daniel Kiper; reusing the
>     original raid6 recovery code of grub
> 
> 
> BR
> G.Baroncelli
> 
> 


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