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.

RETURN
       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 AT hansenpartnership.com>
           Author.

       Rob Landley <rob AT landley.net>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   SCSI_TRACK_QUEUE_FUL(9)