kernel.git/drivers/s390/block, branch linux-3.12.y

s390/dasd: fix hanging device after clear subchannel

2016-09-21T11:40:09Z

commit 9ba333dc55cbb9523553df973adb3024d223e905 upstream. When a device is in a status where CIO has killed all I/O by itself the interrupt for a clear request may not contain an irb to determine the clear function. Instead it contains an error pointer -EIO. This was ignored by the DASD int_handler leading to a hanging device waiting for a clear interrupt. Handle -EIO error pointer correctly for requests that are clear pending and treat the clear as successful. Signed-off-by: Stefan Haberland Reviewed-by: Sebastian Ott Signed-off-by: Martin Schwidefsky Signed-off-by: Jiri Slaby

s390/dasd: fix refcount for PAV reassignment

2016-03-03T11:46:01Z

commit 9d862ababb609439c5d6987f6d3ddd09e703aa0b upstream. Add refcount to the DASD device when a summary unit check worker is scheduled. This prevents that the device is set offline with worker in place. Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky Signed-off-by: Jiri Slaby

s390/dasd: prevent incorrect length error under z/VM after PAV changes

2016-03-03T11:46:01Z

commit 020bf042e5b397479c1174081b935d0ff15d1a64 upstream. The channel checks the specified length and the provided amount of data for CCWs and provides an incorrect length error if the size does not match. Under z/VM with simulation activated the length may get changed. Having the suppress length indication bit set is stated as good CCW coding practice and avoids errors under z/VM. Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky Signed-off-by: Jiri Slaby

s390/dasd: hold request queue sysfs lock when calling elevator_init()

2014-03-31T12:22:21Z

commit ef0899410ff630b2e75306da49996dbbfa318165 upstream. "elevator: Fix a race in elevator switching and md device initialization" changed the semantics of elevator_init() in a way that now enforces to hold the corresponding request queue's sysfs_lock when calling elevator_init() to fix a race. The patch did not convert the s390 dasd device driver which is the only device driver which also calls elevator_init(). So add the missing locking. Cc: Tomoki Sekiyama Cc: Jens Axboe Signed-off-by: Heiko Carstens Signed-off-by: Jens Axboe Signed-off-by: Jiri Slaby

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

2013-10-15T11:47:58Z

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

2013-09-04T15:19:13Z

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

2013-08-28T07:19:34Z

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

2013-08-22T10:20:09Z

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

2013-08-22T10:20:01Z

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()

2013-08-22T10:20:00Z

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