partitions: dos: parse extended partition ...

DOS MBRs might contain an extended partition that holds several logical
partitions. Add these to the partitions of the block device.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

partitions: dos: don't open code get_unaligned_le32 ...

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

partitions: dos: improve guess of disk size ...

The code used to ineffectively take the end of the last partition as guess
for the disk size. Better use the end of the partition that has its end
rearmost.

Also return an unsigned type instead of int as the result is always
non-negative.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

cdev: store dos partition type in struct cdev ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

partitions: dos: fix memory leak in nt disk signature ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

partition: DOS: Add parameter for the NT disk Signature ...

The NT disk Signature is a unique 32-bit value in the MBR allowing
to identify a MSDOS partitioned disk. The signature can be used to
specify the Linux rootfs.
This patch adds support for the NT disk Signature in the form of a
device parameter which can both be read and written.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

disk: introduce partition name ...

so we can register partion with name as present in EFI GPT

Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

partitons: add framework ...

so we can support multiple format

use filetpye to detect the parser to use

Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>