diff options
author | Bart Van Assche <bvanassche@acm.org> | 2018-09-26 14:01:04 -0700 |
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committer | Jens Axboe <axboe@kernel.dk> | 2018-09-26 15:11:28 -0600 |
commit | cd84a62e0078dce09f4ed349bec84f86c9d54b30 (patch) | |
tree | 2cdd58e3abebc23c86351ca12815b751a62bdc1a /net/ceph | |
parent | bca6b067b0b269a7b8ba129e2a918309ca8b4a55 (diff) |
block, scsi: Change the preempt-only flag into a counter
The RQF_PREEMPT flag is used for three purposes:
- In the SCSI core, for making sure that power management requests
are executed even if a device is in the "quiesced" state.
- For domain validation by SCSI drivers that use the parallel port.
- In the IDE driver, for IDE preempt requests.
Rename "preempt-only" into "pm-only" because the primary purpose of
this mode is power management. Since the power management core may
but does not have to resume a runtime suspended device before
performing system-wide suspend and since a later patch will set
"pm-only" mode as long as a block device is runtime suspended, make
it possible to set "pm-only" mode from more than one context. Since
with this change scsi_device_quiesce() is no longer idempotent, make
that function return early if it is called for a quiesced queue.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Cc: Jianchao Wang <jianchao.w.wang@oracle.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'net/ceph')
0 files changed, 0 insertions, 0 deletions