centos man page for wait_for_completion_io_timeout

WAIT_FOR_COMPLETION_(9) 					   Driver Basics					   WAIT_FOR_COMPLETION_(9)

NAME
       wait_for_completion_io_timeout - waits for completion of a task (w/timeout)

SYNOPSIS
       unsigned long __sched wait_for_completion_io_timeout(struct completion * x, unsigned long timeout);

ARGUMENTS
       x
	   holds the state of this particular completion

       timeout
	   timeout value in jiffies

DESCRIPTION
       This waits for either a completion of a specific task to be signaled or for a specified timeout to expire. The timeout is in jiffies. It is
       not interruptible. The caller is accounted as waiting for IO.

RETURN
       0 if timed out, and positive (at least 1, or number of jiffies left till timeout) if completed.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   WAIT_FOR_COMPLETION_(9)