linux/block/partitions
Stefan Weinhuber 46e8894786 s390/partitions: make partition detection independent from DASD ioctls
In some usage scenarios it is desireable to work with disk images or
virtualized DASD devices. One problem that prevents such applications
is the partition detection in ibm.c. Currently it works only for
devices that support the BIODASDINFO2 ioctl, in other words, it only
works for devices that belong to the DASD device driver.

The information gained from the BIODASDINFO2 ioctl is only for a small
set of legacy cases abolutely necessary. All current VOL1, LNX1 and
CMS1 type of disk labels can be interpreted correctly without this
information, as long as the generic HDIO_GETGEO ioctl works and
provides a correct disk geometry.

This patch makes the ibm.c partition detection as independent as
possible from the BIODASDINFO2 ioctl. Only the following two cases are
still restricted to real DASDs:
- An FBA DASD, or LDL formatted ECKD DASD without any disk label.
- An old style LNX1 label (without large volume support) on a disk
  with inconsistent device geometry.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-09-26 15:45:05 +02:00
..
Kconfig move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
Makefile move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
acorn.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
acorn.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
amiga.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
amiga.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
atari.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
atari.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
check.c separate partition format handling from generic code 2012-01-03 22:54:06 -05:00
check.h separate partition format handling from generic code 2012-01-03 22:54:06 -05:00
efi.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
efi.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
ibm.c s390/partitions: make partition detection independent from DASD ioctls 2012-09-26 15:45:05 +02:00
ibm.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
karma.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
karma.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
ldm.c LDM: Fix reassembly of extended VBLKs. 2012-02-24 09:37:42 +00:00
ldm.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
mac.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
mac.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
msdos.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
msdos.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
osf.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
osf.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
sgi.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
sgi.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
sun.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
sun.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
sysv68.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
sysv68.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
ultrix.c move fs/partitions to block/ 2012-01-03 22:54:06 -05:00
ultrix.h move fs/partitions to block/ 2012-01-03 22:54:06 -05:00