centos man page for scsi_track_queue_full

SCSI_TRACK_QUEUE_FUL(9) 					  SCSI mid layer					   SCSI_TRACK_QUEUE_FUL(9)

NAME
       scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth

SYNOPSIS
       int scsi_track_queue_full(struct scsi_device * sdev, int depth);

ARGUMENTS
       sdev
	   SCSI Device in question

       depth
	   Current number of outstanding SCSI commands on this device, not counting the one returned as QUEUE_FULL.

DESCRIPTION
       This function will track successive QUEUE_FULL events on a specific SCSI device to determine if and when there is a need to adjust the
       queue depth on the device.

RETURNS
       0 - No change needed, >0 - Adjust queue depth to this new depth, -1 - Drop back to untagged operation using host->cmd_per_lun as the
       untagged command depth

LOCK STATUS
       None held on entry

NOTES
       Low level drivers may call this at any time and we will do "The Right Thing."  We are interrupt context safe.

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

       Rob Landley <rob@landley.net>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   SCSI_TRACK_QUEUE_FUL(9)