centos man page for scsi_device_quiesce

SCSI_DEVICE_QUIESCE(9)						  SCSI mid layer					    SCSI_DEVICE_QUIESCE(9)

NAME
       scsi_device_quiesce - Block user issued commands.

SYNOPSIS
       int scsi_device_quiesce(struct scsi_device * sdev);

ARGUMENTS
       sdev
	   scsi device to quiesce.

DESCRIPTION
       This works by trying to transition to the SDEV_QUIESCE state (which must be a legal transition). When the device is in this state, only
       special requests will be accepted, all others will be deferred. Since special requests may also be requeued requests, a successful return
       doesn't guarantee the device will be totally quiescent.

       Must be called with user context, may sleep.

       Returns zero if unsuccessful or an error if not.

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

       Rob Landley <rob@landley.net>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						    SCSI_DEVICE_QUIESCE(9)