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>

partitions: Add missing depends on BLOCK ...

The disk partitions use blockdevice functions, so add the corresponding
depends on BLOCK.

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

block: implement block_read/block_write functions ...

Some drivers use blk->ops->read/write. This bypasses the caching block
layer and was never intended like this. The upper API to the block layer
is the cdev layer. This patch adds block_read and block_write functions
and uses them where appropriate.

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

disk: partitions: add EFI GUID Partition Table ...

form linux 3.8

so you can have part by num or name
not by GUID as this is a non human reading name

     `---- ffe08000.sata
          `---- 0x00000000-0x3fffffff: /dev/ata0
          `---- 0x00100000-0x063fffff: /dev/ata0.0
          `---- 0x00100000-0x063fffff: /dev/ata0.boot
          `---- 0x06400000-0x3fefffff: /dev/ata0.1
          `---- 0x06400000-0x3fefffff: /dev/ata0.linux

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>

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>