[PATCH] bug fix for raid code

[Bean]

Hi,

This patch fix an issue in raid0. mdadm set the disk size field in
super block to 0 for raid0, so the size of device (md0) will be 0.
This patch fix this by calculating the size of (md0) when
array->disk_size is 0.

Another problem is actually caused by qemu, but as it's the main
testing platform, I add it here as well. For cdrom drive, the size is
not accurate. When raid.c scans a cdrom drive, it read beyond the cd
limit, which cause qemu to halt. This patch add a field size_invalid
in the disk structure, and raid use this to avoid scanning cdrom
drives.

2008-08-09  Bean  <address@hidden>

        * disk/i386/pc/biodisk.c (grub_biosdisk_open): Set size_invalid for
        cdrom drive.

        * disk.raid.c (grub_raid_open): Calculte the raid0 disk size if
        array->disk_size is 0.
        (grub_raid_scan_device): Skip drive where size_invalid is set.

        * include/grub/disk.h (grub_disk): New field size_invalid.

        * kern/disk.c (grub_disk_open): Initialize field size_invalid to 0.

-- 
Bean

raid.diff
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