[PATCH 0/7] s390/dasd: add dasd autoquiesce feature

[Stefan Haberland <sth@linux.ibm.com>]

Hi Jens,

please apply the following patchset that introduces an
autoquiesce feature for DASD devices.

Quiesce and resume are functions that tell Linux to stop/resume
issuing I/Os to a specific DASD.
The DASD driver allows a manual quiesce/resume via ioctl.

Autoquiesce will define an amount of triggers that will lead to
an automatic quiesce if a certain event occurs.
There is no automatic resume.

The autoquiesce feature is useful for devices in a copy relation
where different events should lead to an automatic quiesce of a
device. This prevents IO errors, unnecessary load and gives the
controlling agent time to sort out the situation and trigger a swap
of copy pairs if needed before it will resume device operation.

Stefan Haberland (7):
  s390/dasd: remove unused DASD EER defines
  s390/dasd: add autoquiesce feature
  s390/dasd: add aq_mask sysfs attribute
  s390/dasd: add aq_requeue sysfs attribute
  s390/dasd: add aq_timeouts autoquiesce trigger
  s390/dasd: add autoquiesce event for start IO error
  s390/dasd: fix hanging blockdevice after request requeue

 arch/s390/include/uapi/asm/dasd.h |   2 +
 drivers/s390/block/dasd.c         |  75 +++++++++++++-----
 drivers/s390/block/dasd_devmap.c  | 126 ++++++++++++++++++++++++++++++
 drivers/s390/block/dasd_eckd.c    |   1 +
 drivers/s390/block/dasd_eer.c     |   1 +
 drivers/s390/block/dasd_int.h     |  32 ++++----
 6 files changed, 204 insertions(+), 33 deletions(-)

-- 
2.37.2