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linux-sg2042/include/scsi
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Christoph Hellwig 71e75c97f9 scsi: convert device_busy to atomic_t 
Avoid taking the queue_lock to check the per-device queue limit.  Instead
we do an atomic_inc_return early on to grab our slot in the queue,
and if necessary decrement it after finishing all checks.

Unlike the host and target busy counters this doesn't allow us to avoid the
queue_lock in the request_fn due to the way the interface works, but it'll
allow us to prepare for using the blk-mq code, which doesn't use the
queue_lock at all, and it at least avoids a queue_lock round trip in
scsi_device_unbusy, which is still important given how busy the queue_lock
is.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Webb Scales <webbnh@hp.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Tested-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Robert Elliott <elliott@hp.com>
 		2014-07-25 07:43:45 -04:00
..
fc libfc: Source code comment spelling fixes 2013-09-04 12:47:49 -07:00
fc_encode.h [SCSI] libfc: Add support for FDMI 2012-02-19 08:08:58 -06:00
fc_frame.h [SCSI] fcoe: remove unused ptype field in fcoe_rcv_info 2011-07-28 12:08:55 +04:00
fcoe_sysfs.h libfcoe, fcoe, bnx2fc: Add new fcoe control interface 2012-12-14 10:38:54 -08:00
iscsi_if.h [SCSI] scsi_transport_iscsi: Export ISCSI_PARAM_LOCAL_IPADDR attr for iscsi_connection 2013-12-19 20:56:26 -08:00
iscsi_proto.h [SCSI] be2iscsi: Get Initiator Name for the iSCSI_Host 2012-04-25 09:29:35 +01:00
libfc.h libfc: Do not invoke the response handler after fc_exch_done() 2013-09-04 13:45:22 -07:00
libfcoe.h libfcoe: Make fcoe_sysfs optional / fix fnic NULL exception 2013-10-11 13:25:40 -07:00
libiscsi.h Main batch of InfiniBand/RDMA changes for 3.15: 2014-04-03 16:57:19 -07:00
libiscsi_tcp.h [SCSI] libiscsi: Reduce locking contention in fast path 2014-03-15 10:19:18 -07:00
libsas.h libata, libsas: kill pm_result and related cleanup 2014-03-18 16:08:38 -04:00
osd_attributes.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
osd_initiator.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
osd_ore.h ore: Fix wrong math in allocation of per device BIO 2014-01-23 10:55:03 +02:00
osd_protocol.h include/scsi/osd_protocol.h: remove unnecessary __constant 2014-06-02 10:36:27 +02:00
osd_sec.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
osd_sense.h [SCSI] libosd: osd_sense: OSD_CFO_PERMISSIONS 2009-12-04 12:01:44 -06:00
osd_types.h [SCSI] libosd: Support for scatter gather write/read commands 2010-10-26 10:42:34 -05:00
sas.h [SCSI] sas: unify the pointlessly separated enums sas_dev_type and sas_device_type 2013-05-10 07:47:52 -07:00
sas_ata.h [SCSI] sas: unify the pointlessly separated enums sas_dev_type and sas_device_type 2013-05-10 07:47:52 -07:00
scsi.h scsi: use 64-bit LUNs 2014-07-17 22:07:37 +02:00
scsi_bsg_iscsi.h [SCSI] iscsi class: add bsg support to iscsi class 2011-08-27 08:36:21 -06:00
scsi_cmnd.h scsi: remove various exports that were only used by scsi_tgt 2014-07-17 22:07:45 +02:00
scsi_dbg.h [SCSI] Fix device not ready printk 2007-10-12 14:51:56 -04:00
scsi_device.h scsi: convert device_busy to atomic_t 2014-07-25 07:43:45 -04:00
scsi_devinfo.h scsi_scan: Restrict sequential scan to 256 LUNs 2014-07-17 22:07:35 +02:00
scsi_dh.h [SCSI] scsi_dh: add scsi_dh_attached_handler_name 2012-07-20 08:58:42 +01:00
scsi_driver.h scsi: mark scsi_setup_blk_pc_cmnd static 2014-07-17 22:16:29 +02:00
scsi_eh.h [SCSI] scsi_eh_prep_cmnd should save scmd->underflow 2008-07-26 15:14:56 -04:00
scsi_host.h scsi: convert host_busy to atomic_t 2014-07-25 07:43:43 -04:00
scsi_ioctl.h [PATCH] don't mess with file in scsi_nonblockable_ioctl() 2008-10-21 07:47:28 -04:00
scsi_tcq.h [SCSI] target: Convert TASK_ATTR to scsi_tcq.h definitions 2011-05-24 13:03:56 -04:00
scsi_transport.h scsi: use 64-bit LUNs 2014-07-17 22:07:37 +02:00
scsi_transport_fc.h [SCSI] scsi_transport_fc: Add 32Gbps speed definition. 2014-03-15 10:17:50 -07:00
scsi_transport_iscsi.h SCSI/libiscsi: Add check_protection callback for transports 2014-03-17 22:33:58 -07:00
scsi_transport_sas.h [SCSI] sas: unify the pointlessly separated enums sas_dev_type and sas_device_type 2013-05-10 07:47:52 -07:00
scsi_transport_spi.h [SCSI] aic79xx: make driver respect nvram for IU and QAS settings 2009-06-15 10:09:35 -05:00
scsi_transport_srp.h scsi_transport_srp: Fix two kernel-doc warnings 2014-03-24 10:05:30 -07:00
scsicam.h
…
sg.h sg: add SG_FLAG_Q_AT_TAIL flag 2014-07-17 22:07:34 +02:00
srp.h IB/srp: Implement SRP_CRED_REQ and SRP_AER_REQ 2010-10-22 22:19:10 -07:00