linux-toradex.git/drivers/s390/block, branch v3.7

s390/dcssblk: cleanup device attribute usage

2012-10-09T12:16:56+00:00

Let the driver core handle device attribute creation and removal. This
will simplify the code and eliminates races between attribute
availability and userspace notification via uevents.

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

s390/dasd: check count address during online setting

2012-09-26T13:45:26+00:00

A common way to prepare a z/VM mini disk is to format the real device
with a z/VM tool like CPFMTXA and then define a mini disk that excludes
the first cylinder, i.e. the cylinder 0 of the virtual disk is located
at cylinder 1 of the real device.

The DASD device driver will recognize such a mini disk as formatted, as
the uniform record layout on the disk matches that of an LDL formatted
device. However, the cylinder value in the 'count' field of the ECKD
records matches the geometry of the real device, and not that of the
mini disk, so I/O requests will fail with 'record not found' errors.

To make the mini disk usable, it needs to be formatted with a tool like
dasdfmt. To enable tools like distribution installation tools to
recognize this situation, the DASD device driver should report such a
mini disk as 'not formatted'.
To this end we need to extend the device recognition code to check not
just for proper record sizes, but also for proper cylinder/head/record
values.

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

s390/etr,stp: use -EOPNOTSUPP instead of -ENOSYS

2012-09-26T13:45:14+00:00

Change -ENOSYS to -EOPNOTSUPP. Return value is used only internally.

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

s390/dasd: fix return value for non-existent ioctls

2012-09-26T13:45:12+00:00

For non-existent ioctls -ENOTTY should be returned.

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

s390/scm: reorder scm_remove

2012-09-26T13:45:10+00:00

Do not reset drvdata before the block device is cleaned up. With a
non-empty block queue drvdata could be accessed.

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

s390/scm: remove superfluous lock

2012-09-26T13:45:09+00:00

Remove the spinlock from struct scm_device. drvdata and attributes
are guarded via device_lock.

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

s390/scm_block: force cluster writes

2012-09-26T13:45:01+00:00

Force writes to Storage Class Memory (SCM) to be in done in clusters.

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

s390: add scm block driver

2012-09-26T13:45:01+00:00

Block device driver for Storage Class Memory (SCM). This driver
provides a block device interface for each available SCM increment.

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

s390: add eadm facility bits

2012-09-26T13:44:57+00:00

Add the eadm facility bits to the css characteristics and move
them to a new header.

Signed-off-by: Sebastian Ott 
Signed-off-by: Martin Schwidefsky

s390/dasd: fix read unit address configuration loop

2012-09-17T07:58:21+00:00

Read unit address is done for all devices during online processing to read
out LCU features. This is also done after disconnect/connect a LCU.
Some older storage hardware does not provide the capability to read unit
address configuration.
This leads to a loop trying to read unit address configuration every 30
seconds. The device is still operational but logs are flooded with error
messages.

Fix the loop by recognizing a command reject saying that the suborder
for ruac is not supported.

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