linux.git/drivers/s390/block/dasd_devmap.c, branch v2.6.27

[S390] dasd: Add support for enhanced VM UID

2008-08-01T14:39:29+00:00

When z/VM provides two virtual devices (minidisks) that reside on the
same real device, both will receive the configuration data from the
real device and thus get the same uid. To fix this problem, z/VM
provides an additional configuration data record that allows to
distinguish between minidisks.
z/VM APAR VM64273 needs be installed so this fix has an effect.

Signed-off-by: Stefan Weinhuber 
Signed-off-by: Martin Schwidefsky

[S390] dasd: Use const in busid functions.

2008-05-15T14:52:39+00:00

We should use 'const char *' in the busid functions since the
strings are not modified anyway.

Signed-off-by: Cornelia Huck 
Signed-off-by: Martin Schwidefsky

[S390] dasd: add hyper PAV support to DASD device driver, part 1

2008-01-26T13:11:28+00:00

Parallel access volumes (PAV) is a storage server feature, that allows
to start multiple channel programs on the same DASD in parallel. It
defines alias devices which can be used as alternative paths to the
same disk. With the old base PAV support we only needed rudimentary
functionality in the DASD device driver. As the mapping between base
and alias devices was static, we just had to export an identifier
(uid) and could leave the combining of devices to external layers
like a device mapper multipath.
Now hyper PAV removes the requirement to dedicate alias devices to
specific base devices. Instead each alias devices can be combined with
multiple base device on a per request basis. This requires full
support by the DASD device driver as now each channel program itself
has to identify the target base device.
The changes to the dasd device driver and the ECKD discipline are:
- Separate subchannel device representation (dasd_device) from block
  device representation (dasd_block). Only base devices are block
  devices.
- Gather information about base and alias devices and possible
  combinations.
- For each request decide which dasd_device should be used (base or
  alias) and build specific channel program.
- Support summary unit checks, which allow the storage server to
  upgrade / downgrade between base and hyper PAV at runtime (support
  is mandatory).

Signed-off-by: Stefan Weinhuber 
Signed-off-by: Martin Schwidefsky

mm: Remove slab destructors from kmem_cache_create().

2007-07-20T01:11:58+00:00

Slab destructors were no longer supported after Christoph's
c59def9f222d44bb7e2f0a559f2906191a0862d7 change. They've been
BUGs for both slab and slub, and slob never supported them
either.

This rips out support for the dtor pointer from kmem_cache_create()
completely and fixes up every single callsite in the kernel (there were
about 224, not including the slab allocator definitions themselves,
or the documentation references).

Signed-off-by: Paul Mundt

[S390] dasd: Add ipldev parameter.

2007-04-27T14:01:44+00:00

Specifying 'ipldev' in the dasd= kernel parameter will automatically
activate the boot device for use by the dasd driver.

Signed-off-by: Peter Oberparleiter 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] dasd: Add sysfs attribute status and generate uevents.

2007-04-27T14:01:44+00:00

This patch adds a sysfs-attribute 'status' to make the DASD device-status
accessible from user-space. In addition, the DASD driver generates an
uevent(CHANGE) for the ccw-device on each device-status change.
This enables user-space applications (e.g. udev) to do related processing.

Signed-off-by: Horst Hummel 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] Avoid excessive inlining.

2007-02-05T20:18:53+00:00

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] New DASD feature for ERP related logging

2006-12-08T14:54:15+00:00

It is now possible to enable/disable ERP related logging without re-compile
and re-ipl. A additional sysfs-attribute 'erplog' allows to switch the
logging non-interruptive.

Signed-off-by: Horst Hummel 
Signed-off-by: Martin Schwidefsky

[PATCH] slab: remove kmem_cache_t

2006-12-07T16:39:25+00:00

Replace all uses of kmem_cache_t with struct kmem_cache.

The patch was generated using the following script:

	#!/bin/sh
	#
	# Replace one string by another in all the kernel sources.
	#

	set -e

	for file in `find * -name "*.c" -o -name "*.h"|xargs grep -l $1`; do
		quilt add $file
		sed -e "1,\$s/$1/$2/g" $file >/tmp/$$
		mv /tmp/$$ $file
		quilt refresh
	done

The script was run like this

	sh replace kmem_cache_t "struct kmem_cache"

Signed-off-by: Christoph Lameter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[S390] return 'count' for successful execution of dasd_eer_enable.

2006-12-04T14:40:18+00:00

Currently the return value of 'dasd_eer_enable' is returned - even if the
function returned '0'. Now return 'count' for successful execution.

Signed-off-by: Horst Hummel 
Signed-off-by: Martin Schwidefsky