On Sun, Jun 03, 2018 at 08:53:48PM +0200, Goffredo Baroncelli wrote:
> Add the RAID 6 recovery, in order to use a RAID 6 filesystem even if some
> disks (up to two) are missing. This code use the md RAID 6 code already
> present in grub.
>
> Signed-off-by: Goffredo Baroncelli <kreij...@inwind.it>
> ---
> grub-core/fs/btrfs.c | 50 ++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 44 insertions(+), 6 deletions(-)
>
> diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
> index c8f034641..0b6557ce3 100644
> --- a/grub-core/fs/btrfs.c
> +++ b/grub-core/fs/btrfs.c
> @@ -30,6 +30,7 @@
> #include <grub/i18n.h>
> #include <grub/btrfs.h>
> #include <grub/crypto.h>
> +#include <grub/diskfilter.h>
>
> GRUB_MOD_LICENSE ("GPLv3+");
>
> @@ -706,11 +707,35 @@ rebuild_raid5 (char *dest, struct raid56_buffer
> *buffers,
> }
> }
>
> +static grub_err_t
> +raid6_recover_read_buffer (void *data, int disk_nr,
> + grub_uint64_t addr __attribute__ ((unused)),
> + void *dest, grub_size_t size)
> +{
> + struct raid56_buffer *buffers = data;
> +
> + grub_memcpy(dest, buffers[disk_nr].buf, size);
> +
> + grub_errno = buffers[disk_nr].data_is_valid ? GRUB_ERR_NONE :
> + GRUB_ERR_READ_ERROR;
> + return grub_errno;
if (!buffers[disk_nr].data_is_valid)
return GRUB_ERR_READ_ERROR;
grub_memcpy(dest, buffers[disk_nr].buf, size);
return GRUB_ERR_NONE;
Daniel
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