scsi_execute(9) [centos man page]

SCSI_EXECUTE(9) 						  SCSI mid layer						   SCSI_EXECUTE(9)

NAME

       scsi_execute - insert request and wait for the result

SYNOPSIS

       int scsi_execute(struct scsi_device * sdev, const unsigned char * cmd, int data_direction, void * buffer, unsigned bufflen,
			unsigned char * sense, int timeout, int retries, int flags, int * resid);

ARGUMENTS

       sdev
	   scsi device

       cmd
	   scsi command

       data_direction
	   data direction

       buffer
	   data buffer

       bufflen
	   len of buffer

       sense
	   optional sense buffer

       timeout
	   request timeout in seconds

       retries
	   number of times to retry request

       flags
	   or into request flags;

       resid
	   optional residual length

DESCRIPTION

       returns the req->errors value which is the scsi_cmnd result field.

AUTHORS

       James Bottomley <James.Bottomley@hansenpartnership.com>
	   Author.

       Rob Landley <rob@landley.net>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							   SCSI_EXECUTE(9)

TAPSET::SCSI(3stap)													       TAPSET::SCSI(3stap)

NAME

       tapset::scsi - systemtap scsi probe points

DESCRIPTION

       This family of probe points is used to probe the SCSI activities.  It contains the following probe points:

       scsi.ioentry
	      Fires when SCSI mid layer prepares a SCSI request

	      Arguments:

	      disk_major
		The major number of the disk

	      disk_minor
		The minor number of the disk

	      device_state
		The current state of the device. The possible values could be:

		      SDEV_CREATED = 1,    /* device created but not added to sysfs
					    * Only internal commands allowed (for inq) */
		      SDEV_RUNNING = 2,    /* device properly configured
					    * All commands allowed */
		      SDEV_CANCEL = 3,	   /* beginning to delete device
					    * Only error handler commands allowed */
		      SDEV_DEL = 4,	   /* device deleted
					    * no commands allowed */
		      SDEV_QUIESCE = 5,    /* Device quiescent.  No block commands
					    * will be accepted, only specials (which
					    * originate in the mid-layer) */
		      SDEV_OFFLINE = 6,    /* Device offlined (by error handling or
					    * user request */
		      SDEV_BLOCK = 7,	   /* Device blocked by scsi lld.  No scsi
					    * commands from user or midlayer should be issued
					    * to the scsi lld. */

       scsi.iodispatching
	      Fires when the SCSI mid layer dispatches a SCSI command to the low level driver

	      Arguments:

	      host_no
		The host number

	      channel
		The channel number

	      lun
		The lun number

	      dev_id
		The scsi device id

	      device_state
		The current state of the device.

	      data_direction
		The data_direction specifies whether this command is from/to the device.
		The possible values could be:

		      DMA_BIDIRECTIONAL = 0,
		      DMA_TO_DEVICE = 1,
		      DMA_FROM_DEVICE = 2,
		      DMA_NONE = 3,

	      request_buffer
		The request buffer address

	      req_bufflen
		The request buffer length

       scsi.iodone
	      Fires when a SCSI command is done by low level driver and enqueued into the done queue.

	      Arguments:

	      host_no
		The host number

	      channel
		The channel number

	      lun
		The lun number

	      dev_id
		The scsi device id

	      device_state
		The current state of the device

	      data_direction
		The data_direction specifies whether this command is from/to the device.

       scsi.iocompleted
	      Fires when SCSI mid layer runs the completion processing for block device I/O requests

	      Arguments:

	      host_no
		The host number

	      channel
		The channel number

	      lun
		The lun number

	      dev_id
		The scsi device id

	      device_state
		The current state of the device

	      data_direction
		The data_direction specifies whether this command is from/to the device.

	      goodbytes
		The bytes completed.

SEE ALSO

       stap(1), stapprobes(3stap)

IBM
															       TAPSET::SCSI(3stap)