tree b8c238604b78488bb74da32112bfd8369e15e8f9
parent a09c2b70b733cdbe61170323ae88476bb2cd3780
author Egbert Eich <eich@suse.com> 1365486374 +0000
committer Tom Rini <trini@ti.com> 1367439841 -0400

disk/part_dos: check harder for partition table

Devices that used to have a whole disk FAT filesystem but got then
partitioned will most likely still have a FAT or FAT32 signature
in the first sector as this sector does not get overwritten by
a partitioning tool (otherwise the tool would risk to kill the mbr).

The current partition search algorithm will erronously detects such
a device as a raw FAT device.

Instead of looking for the FAT or FAT32 signatures immediately we
use the same algorithm as used by the Linux kernel and first check
for a valid boot indicator flag on each of the 4 partitions.
If the value of this flag is invalid for the first entry we then
do the raw partition check.
If the flag for any higher partition is wrong we assume the device
is neiter a MBR nor PBR device.

Signed-off-by: Egbert Eich <eich@suse.com>