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 2.6. July 2010 SCSI_TRACK_QUEUE_FUL(9)
