kernel/linux.git/drivers/s390/block, branch v3.11.1

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

s390/dasd: Reduce amount of messages for specific errors

2013-07-01T15:31:21+00:00

Whenever a request has been aborted internally by the driver there is no sense data to be had. And printing lots of messages stalls the system, so better to print out a short one-liner. Signed-off-by: Hannes Reinecke Signed-off-by: Stefan Weinhuber Signed-off-by: Martin Schwidefsky

s390/dasd: Implement block timeout handling

2013-07-01T15:31:20+00:00

This patch implements generic block layer timeout handling callbacks for DASDs. When the timeout expires the respective cqr is aborted. With this timeout handler time-critical request abort is guaranteed as the abort does not depend on the internal state of the various DASD driver queues. Signed-off-by: Hannes Reinecke Acked-by: Stefan Weinhuber Signed-off-by: Stefan Weinhuber Signed-off-by: Martin Schwidefsky

s390/dasd: process all requests in the device tasklet

2013-07-01T15:31:18+00:00

Originally the DASD device tasklet would process the entries on the ccw_queue until the first non-final request was found. Which was okay as long as all requests have the same retries and expires parameter. However, as we're now allowing to modify both it is possible to have requests _after_ the first request which already have expired. So we need to check all requests in the device tasklet. Signed-off-by: Hannes Reinecke Signed-off-by: Stefan Weinhuber Signed-off-by: Martin Schwidefsky

s390/dasd: make number of retries configurable

2013-07-01T15:31:17+00:00

Instead of having the number of retries hard-coded in the various functions we should be using a default retry value, which can be modified via sysfs. Signed-off-by: Hannes Reinecke Signed-off-by: Stefan Weinhuber Signed-off-by: Martin Schwidefsky

s390/dasd: Clarify comment

2013-07-01T15:31:16+00:00

dasd_cancel_req will never return 1, only 0. Signed-off-by: Hannes Reinecke Signed-off-by: Stefan Weinhuber Signed-off-by: Martin Schwidefsky

s390/dasd: Cocci spatch "ptr_ret.spatch"

2013-06-26T19:10:19+00:00

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