kernel/drivers/s390/block/dasd_int.h, branch linux-4.3.y

s390/dasd: fix failing path verification

2015-08-09T19:07:41Z

DASD path verification requires the usage of sleep_on_immediatly to ensure that no other I/O request is blocking the recovery of disconnected devices. But two concurrent path verification workers for the same device may kill each others requests due to the usage of the immediate sleep_on function. This may lead to unsuccessful path verifications. Prevent that two parallel path verification workers conflict with each other by implementing a device flag signalling a already running worker. Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky

s390/dasd: cleanup profiling

2015-01-29T08:19:29Z

The dasd driver has a lot of duplicated code to handle dasd_global_profile. With this patch we use the same code for the global and the per device profiling data. Note that dasd_stats_write had to change slightly to maintain some odd differences between A) per device and global profile and B) proc and sysfs interface usage. Signed-off-by: Sebastian Ott Reviewed-by: Stefan Haberland Signed-off-by: Martin Schwidefsky

s390/dasd: add locking for global_profile access

2015-01-29T08:19:27Z

Access to DASDs global statistics is done without locking which can lead to inconsistent data. Add locking to fix this. Also move the relevant structs in a global dasd_profile struct. Signed-off-by: Sebastian Ott Reviewed-by: Stefan Haberland Signed-off-by: Martin Schwidefsky

s390/dasd: add support for control unit initiated reconfiguration

2014-10-09T07:13:54Z

Add support for Control Unit Initiated Reconfiguration (CUIR) to Linux, a storage server interface to reconcile concurrent hardware changes between storage and host. Reviewed-by: Stefan Weinhuber Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky

s390/dasd: fix camel case

2014-08-01T09:16:18Z

Rename enable_PAV to enable_pav. Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky

dasd: fix error recovery for alias devices during format

2014-07-22T07:26:23Z

Kernel panic or a hanging device during format if an alias device is set offline or I/O errors occur. Omit the error recovery procedure for alias devices and do retries on the base device with full erp. Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky

dasd: use aliases for formatted devices during format

2014-07-22T07:26:21Z

Formatting of a previously formatted device is slower than newly format a device when alias devices are available. For already formatted devices the alias devices are not used for formatting. Fix the alias handling for already formatted devices. Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky

s390/dasd: Fail all requests when DASD_FLAG_ABORTIO is set

2013-07-01T15:31:26Z

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

2013-07-01T15:31:25Z

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

s390/dasd: make number of retries configurable

2013-07-01T15:31:17Z

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