linux-toradex.git/drivers/s390/block, branch v3.12

s390/dasd: check for availability of prefix command during format

2013-10-15T11:47:58+00:00

The prefix command is used instead of a define extent to make use of
PAV alias devices during format. On some older storage servers the
prefix command may not be available and the IO request will fail.
Check for availability of prefix command and use define extent if
not available.

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

s390/irq: rework irq subclass handling

2013-09-04T15:19:13+00:00

Let's not add a function for every external interrupt subclass for
which we need reference counting. Just have two register/unregister
functions which have a subclass parameter:

void irq_subclass_register(enum irq_subclass subclass);
void irq_subclass_unregister(enum irq_subclass subclass);

Signed-off-by: Heiko Carstens

s390/dasd: fix statistics for recovered requests

2013-08-28T07:19:34+00:00

When a recovery cqr is cleaned up, copy the start time, stop time,
and start device to the original cqr. These times are needed later
when the original request is finalized and counted in the DASD
statistics.

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

s390/dasd: enable raw_track_access reads without direct I/O

2013-08-22T10:20:09+00:00

The ECKD protocol supports reading of tracks with arbitrary format as
raw track images. The DASD device driver supports this in its
raw_track_access mode. In this mode it maps each track to sixteen 4096
byte sectors and rejects all requests that are not properly aligned to
this mapping.

An application that wants to use a DASD in raw_track_access mode will
usually use direct I/O to make sure that properly aligned requests are
directly submitted to the driver. However, applications that are not
aware of this mode, e.g. udev, will encounter I/O errors.

To make the use without direct I/O possible and avoid this kind of
alignment errors, we now pad unaligned read requests with a dummy
page, so that we can always read full tracks.  Please note that
writing is still only possible for full track images that are properly
aligned.

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

s390/dasd: cleanup timeout and transport error messages

2013-08-22T10:20:01+00:00

Just a small update to the wording of the messages, to bring them
more in line with our other messages.

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

s390: replace strict_strtoul() with kstrtoul()

2013-08-22T10:20:00+00:00

The usage of strict_strtoul() is not preferred, because
strict_strtoul() is obsolete. Thus, kstrtoul() should be
used.

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

s390/dasd: fix hanging devices after path events

2013-07-30T14:17:25+00:00

The processing of the dasd_block tasklet may have been interrupted
by a path event.
Restart the dasd tasklets in sleep_on_immediately function.

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

s390/dasd: Fail all requests when DASD_FLAG_ABORTIO is set

2013-07-01T15:31:26+00:00

Whenever a DASD request encounters a timeout we might
need to abort all outstanding requests on this or
even other devices.

This is especially useful if one wants to fail all
devices on one side of a RAID10 configuration, even
though only one device exhibited an error.

To handle this I've introduced a new device flag
DASD_FLAG_ABORTIO.
This flag is evaluated in __dasd_process_request_queue()
and will invoke blk_abort_request() for all
outstanding requests with DASD_CQR_FLAGS_FAILFAST set.
This will cause any of these requests to be aborted
immediately if the blk_timeout function is activated.

The DASD_FLAG_ABORTIO is also evaluated in
__dasd_process_request_queue to abort all
new request which would have the
DASD_CQR_FLAGS_FAILFAST bit set.

The flag can be set with the new ioctls 'BIODASDABORTIO'
and removed with 'BIODASDALLOWIO'.

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

s390/dasd: Add 'timeout' attribute

2013-07-01T15:31:25+00:00

This patch adds a 'timeout' attibute to the DASD driver.
When set to non-zero, the blk_timeout function will
be enabled with the timeout specified in the attribute.
Setting 'timeout' to '0' will disable block timeouts.

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

block/dasd: detailed I/O errors

2013-07-01T15:31:22+00:00

The DASD driver is using FASTFAIL as an equivalent to the
transport errors in SCSI. And the 'steal lock' function maps
roughly to a reservation error. So we should be returning the
appropriate error codes when completing a request.

Acked-by: Jens Axboe 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Stefan Weinhuber 
Signed-off-by: Martin Schwidefsky