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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>Chapter 3. SCSI mid layer</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="SCSI Interfaces Guide" /><link rel="up" href="index.html" title="SCSI Interfaces Guide" /><link rel="prev" href="ch.html" title="ch (SCSI Media Changer)" /><link rel="next" href="API-shost-for-each-device.html" title="shost_for_each_device" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 3. SCSI mid layer</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="API-shost-for-each-device.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a id="mid_layer"></a>Chapter 3. SCSI mid layer</h1></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="mid_layer.html#midlayer_implementation">SCSI midlayer implementation</a></span></dt><dd><dl><dt><span class="sect2"><a href="mid_layer.html#scsi_device.h">include/scsi/scsi_device.h</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi.c">drivers/scsi/scsi.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsicam.c">drivers/scsi/scsicam.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_error.c">drivers/scsi/scsi_error.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_devinfo.c">drivers/scsi/scsi_devinfo.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_ioctl.c">drivers/scsi/scsi_ioctl.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_lib.c">drivers/scsi/scsi_lib.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_lib_dma.c">drivers/scsi/scsi_lib_dma.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_module.c">drivers/scsi/scsi_module.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_proc.c">drivers/scsi/scsi_proc.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_netlink.c">drivers/scsi/scsi_netlink.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_scan.c">drivers/scsi/scsi_scan.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_sysctl.c">drivers/scsi/scsi_sysctl.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_sysfs.c">drivers/scsi/scsi_sysfs.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#hosts.c">drivers/scsi/hosts.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#constants.c">drivers/scsi/constants.c</a></span></dt></dl></dd><dt><span class="sect1"><a href="Transport_classes.html">Transport classes</a></span></dt><dd><dl><dt><span class="sect2"><a href="Transport_classes.html#Fibre_Channel_transport">Fibre Channel transport</a></span></dt><dt><span class="sect2"><a href="Transport_classes.html#iSCSI_transport">iSCSI transport class</a></span></dt><dt><span class="sect2"><a href="Transport_classes.html#SAS_transport">Serial Attached SCSI (SAS) transport class</a></span></dt><dt><span class="sect2"><a href="Transport_classes.html#SATA_transport">SATA transport class</a></span></dt><dt><span class="sect2"><a href="Transport_classes.html#SPI_transport">Parallel SCSI (SPI) transport class</a></span></dt><dt><span class="sect2"><a href="Transport_classes.html#SRP_transport">SCSI RDMA (SRP) transport class</a></span></dt></dl></dd></dl></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="midlayer_implementation"></a>SCSI midlayer implementation</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="mid_layer.html#scsi_device.h">include/scsi/scsi_device.h</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi.c">drivers/scsi/scsi.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsicam.c">drivers/scsi/scsicam.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_error.c">drivers/scsi/scsi_error.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_devinfo.c">drivers/scsi/scsi_devinfo.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_ioctl.c">drivers/scsi/scsi_ioctl.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_lib.c">drivers/scsi/scsi_lib.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_lib_dma.c">drivers/scsi/scsi_lib_dma.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_module.c">drivers/scsi/scsi_module.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_proc.c">drivers/scsi/scsi_proc.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_netlink.c">drivers/scsi/scsi_netlink.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_scan.c">drivers/scsi/scsi_scan.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_sysctl.c">drivers/scsi/scsi_sysctl.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#scsi_sysfs.c">drivers/scsi/scsi_sysfs.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#hosts.c">drivers/scsi/hosts.c</a></span></dt><dt><span class="sect2"><a href="mid_layer.html#constants.c">drivers/scsi/constants.c</a></span></dt></dl></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_device.h"></a>include/scsi/scsi_device.h</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-shost-for-each-device.html"><span class="phrase">shost_for_each_device</span></a></span><span class="refpurpose"> —
iterate over all devices of a host
</span></dt><dt><span class="refentrytitle"><a href="API---shost-for-each-device.html"><span class="phrase">__shost_for_each_device</span></a></span><span class="refpurpose"> —
iterate over all devices of a host (UNLOCKED)
</span></dt></dl></div><p>
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi.c"></a>drivers/scsi/scsi.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-device-type.html"><span class="phrase">scsi_device_type</span></a></span><span class="refpurpose"> —
Return 17 char string indicating device type.
</span></dt><dt><span class="refentrytitle"><a href="API---scsi-get-command.html"><span class="phrase">__scsi_get_command</span></a></span><span class="refpurpose"> —
Allocate a struct scsi_cmnd
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-get-command.html"><span class="phrase">scsi_get_command</span></a></span><span class="refpurpose"> —
Allocate and setup a scsi command block
</span></dt><dt><span class="refentrytitle"><a href="API---scsi-put-command.html"><span class="phrase">__scsi_put_command</span></a></span><span class="refpurpose"> —
Free a struct scsi_cmnd
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-put-command.html"><span class="phrase">scsi_put_command</span></a></span><span class="refpurpose"> —
Free a scsi command block
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-allocate-command.html"><span class="phrase">scsi_allocate_command</span></a></span><span class="refpurpose"> —
get a fully allocated SCSI command
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-free-command.html"><span class="phrase">scsi_free_command</span></a></span><span class="refpurpose"> —
free a command allocated by scsi_allocate_command
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-cmd-get-serial.html"><span class="phrase">scsi_cmd_get_serial</span></a></span><span class="refpurpose"> —
Assign a serial number to a command
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-finish-command.html"><span class="phrase">scsi_finish_command</span></a></span><span class="refpurpose"> —
cleanup and pass command back to upper layer
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-adjust-queue-depth.html"><span class="phrase">scsi_adjust_queue_depth</span></a></span><span class="refpurpose"> —
Let low level drivers change a device's queue depth
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-track-queue-full.html"><span class="phrase">scsi_track_queue_full</span></a></span><span class="refpurpose"> —
track QUEUE_FULL events to adjust queue depth
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-get-vpd-page.html"><span class="phrase">scsi_get_vpd_page</span></a></span><span class="refpurpose"> —
Get Vital Product Data from a SCSI device
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-report-opcode.html"><span class="phrase">scsi_report_opcode</span></a></span><span class="refpurpose"> —
Find out if a given command opcode is supported
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-device-get.html"><span class="phrase">scsi_device_get</span></a></span><span class="refpurpose"> —
get an additional reference to a scsi_device
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-device-put.html"><span class="phrase">scsi_device_put</span></a></span><span class="refpurpose"> —
release a reference to a scsi_device
</span></dt><dt><span class="refentrytitle"><a href="API-starget-for-each-device.html"><span class="phrase">starget_for_each_device</span></a></span><span class="refpurpose"> —
helper to walk all devices of a target
</span></dt><dt><span class="refentrytitle"><a href="API---starget-for-each-device.html"><span class="phrase">__starget_for_each_device</span></a></span><span class="refpurpose"> —
helper to walk all devices of a target (UNLOCKED)
</span></dt><dt><span class="refentrytitle"><a href="API---scsi-device-lookup-by-target.html"><span class="phrase">__scsi_device_lookup_by_target</span></a></span><span class="refpurpose"> —
find a device given the target (UNLOCKED)
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-device-lookup-by-target.html"><span class="phrase">scsi_device_lookup_by_target</span></a></span><span class="refpurpose"> —
find a device given the target
</span></dt><dt><span class="refentrytitle"><a href="API---scsi-device-lookup.html"><span class="phrase">__scsi_device_lookup</span></a></span><span class="refpurpose"> —
find a device given the host (UNLOCKED)
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-device-lookup.html"><span class="phrase">scsi_device_lookup</span></a></span><span class="refpurpose"> —
find a device given the host
</span></dt></dl></div><p>Main file for the SCSI midlayer.</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsicam.c"></a>drivers/scsi/scsicam.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-bios-ptable.html"><span class="phrase">scsi_bios_ptable</span></a></span><span class="refpurpose"> —
Read PC partition table out of first sector of device.
</span></dt><dt><span class="refentrytitle"><a href="API-scsicam-bios-param.html"><span class="phrase">scsicam_bios_param</span></a></span><span class="refpurpose"> —
Determine geometry of a disk in cylinders/heads/sectors.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-partsize.html"><span class="phrase">scsi_partsize</span></a></span><span class="refpurpose"> —
Parse cylinders/heads/sectors from PC partition table
</span></dt></dl></div><p>
<a class="ulink" href="http://www.t10.org/ftp/t10/drafts/cam/cam-r12b.pdf" target="_top">SCSI
Common Access Method</a> support functions, for use with
HDIO_GETGEO, etc.
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_error.c"></a>drivers/scsi/scsi_error.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-schedule-eh.html"><span class="phrase">scsi_schedule_eh</span></a></span><span class="refpurpose"> —
schedule EH for SCSI host
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-block-when-processing-errors.html"><span class="phrase">scsi_block_when_processing_errors</span></a></span><span class="refpurpose"> —
Prevent cmds from being queued.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-eh-prep-cmnd.html"><span class="phrase">scsi_eh_prep_cmnd</span></a></span><span class="refpurpose"> —
Save a scsi command info as part of error recovery
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-eh-restore-cmnd.html"><span class="phrase">scsi_eh_restore_cmnd</span></a></span><span class="refpurpose"> —
Restore a scsi command info as part of error recovery
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-eh-finish-cmd.html"><span class="phrase">scsi_eh_finish_cmd</span></a></span><span class="refpurpose"> —
Handle a cmd that eh is finished with.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-eh-get-sense.html"><span class="phrase">scsi_eh_get_sense</span></a></span><span class="refpurpose"> —
Get device sense data.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-eh-ready-devs.html"><span class="phrase">scsi_eh_ready_devs</span></a></span><span class="refpurpose"> —
check device ready state and recover if not.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-eh-flush-done-q.html"><span class="phrase">scsi_eh_flush_done_q</span></a></span><span class="refpurpose"> —
finish processed commands or retry them.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-normalize-sense.html"><span class="phrase">scsi_normalize_sense</span></a></span><span class="refpurpose"> —
normalize main elements from either fixed or descriptor sense data format into a common format.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-sense-desc-find.html"><span class="phrase">scsi_sense_desc_find</span></a></span><span class="refpurpose"> —
search for a given descriptor type in descriptor sense data format.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-get-sense-info-fld.html"><span class="phrase">scsi_get_sense_info_fld</span></a></span><span class="refpurpose"> —
get information field from sense data (either fixed or descriptor format)
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-build-sense-buffer.html"><span class="phrase">scsi_build_sense_buffer</span></a></span><span class="refpurpose"> —
build sense data in a buffer
</span></dt></dl></div><p>Common SCSI error/timeout handling routines.</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_devinfo.c"></a>drivers/scsi/scsi_devinfo.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-dev-info-list-add.html"><span class="phrase">scsi_dev_info_list_add</span></a></span><span class="refpurpose"> —
add one dev_info list entry.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-dev-info-list-add-str.html"><span class="phrase">scsi_dev_info_list_add_str</span></a></span><span class="refpurpose"> —
parse dev_list and add to the scsi_dev_info_list.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-get-device-flags.html"><span class="phrase">scsi_get_device_flags</span></a></span><span class="refpurpose"> —
get device specific flags from the dynamic device list.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-exit-devinfo.html"><span class="phrase">scsi_exit_devinfo</span></a></span><span class="refpurpose"> —
remove /proc/scsi/device_info & the scsi_dev_info_list
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-init-devinfo.html"><span class="phrase">scsi_init_devinfo</span></a></span><span class="refpurpose"> —
set up the dynamic device list.
</span></dt></dl></div><p>
Manage scsi_dev_info_list, which tracks blacklisted and whitelisted
devices.
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_ioctl.c"></a>drivers/scsi/scsi_ioctl.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-ioctl.html"><span class="phrase">scsi_ioctl</span></a></span><span class="refpurpose"> —
Dispatch ioctl to scsi device
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-nonblockable-ioctl.html"><span class="phrase">scsi_nonblockable_ioctl</span></a></span><span class="refpurpose"> —
Handle SG_SCSI_RESET
</span></dt></dl></div><p>
Handle ioctl() calls for SCSI devices.
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_lib.c"></a>drivers/scsi/scsi_lib.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-execute.html"><span class="phrase">scsi_execute</span></a></span><span class="refpurpose"> —
insert request and wait for the result
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-mode-select.html"><span class="phrase">scsi_mode_select</span></a></span><span class="refpurpose"> —
issue a mode select
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-mode-sense.html"><span class="phrase">scsi_mode_sense</span></a></span><span class="refpurpose"> —
issue a mode sense, falling back from 10 to six bytes if necessary.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-test-unit-ready.html"><span class="phrase">scsi_test_unit_ready</span></a></span><span class="refpurpose"> —
test if unit is ready
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-device-set-state.html"><span class="phrase">scsi_device_set_state</span></a></span><span class="refpurpose"> —
Take the given device through the device state model.
</span></dt><dt><span class="refentrytitle"><a href="API-sdev-evt-send.html"><span class="phrase">sdev_evt_send</span></a></span><span class="refpurpose"> —
send asserted event to uevent thread
</span></dt><dt><span class="refentrytitle"><a href="API-sdev-evt-alloc.html"><span class="phrase">sdev_evt_alloc</span></a></span><span class="refpurpose"> —
allocate a new scsi event
</span></dt><dt><span class="refentrytitle"><a href="API-sdev-evt-send-simple.html"><span class="phrase">sdev_evt_send_simple</span></a></span><span class="refpurpose"> —
send asserted event to uevent thread
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-device-quiesce.html"><span class="phrase">scsi_device_quiesce</span></a></span><span class="refpurpose"> —
Block user issued commands.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-device-resume.html"><span class="phrase">scsi_device_resume</span></a></span><span class="refpurpose"> —
Restart user issued commands to a quiesced device.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-internal-device-block.html"><span class="phrase">scsi_internal_device_block</span></a></span><span class="refpurpose"> —
internal function to put a device temporarily into the SDEV_BLOCK state
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-internal-device-unblock.html"><span class="phrase">scsi_internal_device_unblock</span></a></span><span class="refpurpose"> —
resume a device after a block request
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-kmap-atomic-sg.html"><span class="phrase">scsi_kmap_atomic_sg</span></a></span><span class="refpurpose"> —
find and atomically map an sg-elemnt
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-kunmap-atomic-sg.html"><span class="phrase">scsi_kunmap_atomic_sg</span></a></span><span class="refpurpose"> —
atomically unmap a virtual address, previously mapped with scsi_kmap_atomic_sg
</span></dt></dl></div><p>
SCSI queuing library.
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_lib_dma.c"></a>drivers/scsi/scsi_lib_dma.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-dma-map.html"><span class="phrase">scsi_dma_map</span></a></span><span class="refpurpose"> —
perform DMA mapping against command's sg lists
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-dma-unmap.html"><span class="phrase">scsi_dma_unmap</span></a></span><span class="refpurpose"> —
unmap command's sg lists mapped by scsi_dma_map
</span></dt></dl></div><p>
SCSI library functions depending on DMA
(map and unmap scatter-gather lists).
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_module.c"></a>drivers/scsi/scsi_module.c</h3></div></div></div><p>
The file drivers/scsi/scsi_module.c contains legacy support for
old-style host templates. It should never be used by any new driver.
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_proc.c"></a>drivers/scsi/scsi_proc.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-proc-hostdir-add.html"><span class="phrase">scsi_proc_hostdir_add</span></a></span><span class="refpurpose"> —
Create directory in /proc for a scsi host
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-proc-hostdir-rm.html"><span class="phrase">scsi_proc_hostdir_rm</span></a></span><span class="refpurpose"> —
remove directory in /proc for a scsi host
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-proc-host-add.html"><span class="phrase">scsi_proc_host_add</span></a></span><span class="refpurpose"> —
Add entry for this host to appropriate /proc dir
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-proc-host-rm.html"><span class="phrase">scsi_proc_host_rm</span></a></span><span class="refpurpose"> —
remove this host's entry from /proc
</span></dt><dt><span class="refentrytitle"><a href="API-proc-print-scsidevice.html"><span class="phrase">proc_print_scsidevice</span></a></span><span class="refpurpose"> —
return data about this host
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-add-single-device.html"><span class="phrase">scsi_add_single_device</span></a></span><span class="refpurpose"> —
Respond to user request to probe for/add device
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-remove-single-device.html"><span class="phrase">scsi_remove_single_device</span></a></span><span class="refpurpose"> —
Respond to user request to remove a device
</span></dt><dt><span class="refentrytitle"><a href="API-proc-scsi-write.html"><span class="phrase">proc_scsi_write</span></a></span><span class="refpurpose"> —
handle writes to /proc/scsi/scsi
</span></dt><dt><span class="refentrytitle"><a href="API-proc-scsi-open.html"><span class="phrase">proc_scsi_open</span></a></span><span class="refpurpose"> —
glue function
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-init-procfs.html"><span class="phrase">scsi_init_procfs</span></a></span><span class="refpurpose"> —
create scsi and scsi/scsi in procfs
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-exit-procfs.html"><span class="phrase">scsi_exit_procfs</span></a></span><span class="refpurpose"> —
Remove scsi/scsi and scsi from procfs
</span></dt></dl></div><p>
The functions in this file provide an interface between
the PROC file system and the SCSI device drivers
It is mainly used for debugging, statistics and to pass
information directly to the lowlevel driver.
I.E. plumbing to manage /proc/scsi/*
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_netlink.c"></a>drivers/scsi/scsi_netlink.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-nl-rcv-msg.html"><span class="phrase">scsi_nl_rcv_msg</span></a></span><span class="refpurpose"> —
Receive message handler.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-netlink-init.html"><span class="phrase">scsi_netlink_init</span></a></span><span class="refpurpose"> —
Called by SCSI subsystem to initialize the SCSI transport netlink interface
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-netlink-exit.html"><span class="phrase">scsi_netlink_exit</span></a></span><span class="refpurpose"> —
Called by SCSI subsystem to disable the SCSI transport netlink interface
</span></dt></dl></div><p>
Infrastructure to provide async events from transports to userspace
via netlink, using a single NETLINK_SCSITRANSPORT protocol for all
transports.
See <a class="ulink" href="http://marc.info/?l=linux-scsi&m=115507374832500&w=2" target="_top">the
original patch submission</a> for more details.
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_scan.c"></a>drivers/scsi/scsi_scan.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-complete-async-scans.html"><span class="phrase">scsi_complete_async_scans</span></a></span><span class="refpurpose"> —
Wait for asynchronous scans to complete
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-unlock-floptical.html"><span class="phrase">scsi_unlock_floptical</span></a></span><span class="refpurpose"> —
unlock device via a special MODE SENSE command
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-alloc-sdev.html"><span class="phrase">scsi_alloc_sdev</span></a></span><span class="refpurpose"> —
allocate and setup a scsi_Device
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-alloc-target.html"><span class="phrase">scsi_alloc_target</span></a></span><span class="refpurpose"> —
allocate a new or find an existing target
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-target-reap.html"><span class="phrase">scsi_target_reap</span></a></span><span class="refpurpose"> —
check to see if target is in use and destroy if not
</span></dt><dt><span class="refentrytitle"><a href="API-sanitize-inquiry-string.html"><span class="phrase">sanitize_inquiry_string</span></a></span><span class="refpurpose"> —
remove non-graphical chars from an INQUIRY result string
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-probe-lun.html"><span class="phrase">scsi_probe_lun</span></a></span><span class="refpurpose"> —
probe a single LUN using a SCSI INQUIRY
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-add-lun.html"><span class="phrase">scsi_add_lun</span></a></span><span class="refpurpose"> —
allocate and fully initialze a scsi_device
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-inq-str.html"><span class="phrase">scsi_inq_str</span></a></span><span class="refpurpose"> —
print INQUIRY data from min to max index, strip trailing whitespace
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-probe-and-add-lun.html"><span class="phrase">scsi_probe_and_add_lun</span></a></span><span class="refpurpose"> —
probe a LUN, if a LUN is found add it
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-sequential-lun-scan.html"><span class="phrase">scsi_sequential_lun_scan</span></a></span><span class="refpurpose"> —
sequentially scan a SCSI target
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-report-lun-scan.html"><span class="phrase">scsi_report_lun_scan</span></a></span><span class="refpurpose"> —
Scan using SCSI REPORT LUN results
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-prep-async-scan.html"><span class="phrase">scsi_prep_async_scan</span></a></span><span class="refpurpose"> —
prepare for an async scan
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-finish-async-scan.html"><span class="phrase">scsi_finish_async_scan</span></a></span><span class="refpurpose"> —
asynchronous scan has finished
</span></dt></dl></div><p>
Scan a host to determine which (if any) devices are attached.
The general scanning/probing algorithm is as follows, exceptions are
made to it depending on device specific flags, compilation options,
and global variable (boot or module load time) settings.
A specific LUN is scanned via an INQUIRY command; if the LUN has a
device attached, a scsi_device is allocated and setup for it.
For every id of every channel on the given host, start by scanning
LUN 0. Skip hosts that don't respond at all to a scan of LUN 0.
Otherwise, if LUN 0 has a device attached, allocate and setup a
scsi_device for it. If target is SCSI-3 or up, issue a REPORT LUN,
and scan all of the LUNs returned by the REPORT LUN; else,
sequentially scan LUNs up until some maximum is reached, or a LUN is
seen that cannot have a device attached to it.
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_sysctl.c"></a>drivers/scsi/scsi_sysctl.c</h3></div></div></div><p>
Set up the sysctl entry: "/dev/scsi/logging_level"
(DEV_SCSI_LOGGING_LEVEL) which sets/returns scsi_logging_level.
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="scsi_sysfs.c"></a>drivers/scsi/scsi_sysfs.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-remove-device.html"><span class="phrase">scsi_remove_device</span></a></span><span class="refpurpose"> —
unregister a device from the scsi bus
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-remove-target.html"><span class="phrase">scsi_remove_target</span></a></span><span class="refpurpose"> —
try to remove a target and all its devices
</span></dt></dl></div><p>
SCSI sysfs interface routines.
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="hosts.c"></a>drivers/scsi/hosts.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-host-set-state.html"><span class="phrase">scsi_host_set_state</span></a></span><span class="refpurpose"> —
Take the given host through the host state model.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-remove-host.html"><span class="phrase">scsi_remove_host</span></a></span><span class="refpurpose"> —
remove a scsi host
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-add-host-with-dma.html"><span class="phrase">scsi_add_host_with_dma</span></a></span><span class="refpurpose"> —
add a scsi host with dma device
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-host-alloc.html"><span class="phrase">scsi_host_alloc</span></a></span><span class="refpurpose"> —
register a scsi host adapter instance.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-host-lookup.html"><span class="phrase">scsi_host_lookup</span></a></span><span class="refpurpose"> —
get a reference to a Scsi_Host by host no
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-host-get.html"><span class="phrase">scsi_host_get</span></a></span><span class="refpurpose"> —
inc a Scsi_Host ref count
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-host-put.html"><span class="phrase">scsi_host_put</span></a></span><span class="refpurpose"> —
dec a Scsi_Host ref count
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-queue-work.html"><span class="phrase">scsi_queue_work</span></a></span><span class="refpurpose"> —
Queue work to the Scsi_Host workqueue.
</span></dt><dt><span class="refentrytitle"><a href="API-scsi-flush-work.html"><span class="phrase">scsi_flush_work</span></a></span><span class="refpurpose"> —
Flush a Scsi_Host's workqueue.
</span></dt></dl></div><p>
mid to lowlevel SCSI driver interface
</p></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a id="constants.c"></a>drivers/scsi/constants.c</h3></div></div></div><div class="toc"><dl class="toc"><dt><span class="refentrytitle"><a href="API-scsi-print-status.html"><span class="phrase">scsi_print_status</span></a></span><span class="refpurpose"> —
print scsi status description
</span></dt></dl></div><p>
mid to lowlevel SCSI driver interface
</p></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="API-shost-for-each-device.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ch (SCSI Media Changer) </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">shost_for_each_device</span></td></tr></table></div></body></html>
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