linux-kernel - Re: About read/write requests in IO scheduler

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Date:	Mon, 11 Nov 2013 13:32:24 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	韩磊 <bonben1989@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: About read/write requests in IO scheduler

韩磊 <bonben1989@...il.com> writes:

> In IO scheduler level, whether all the read requests are synchronous?

Generically, yes, I/O schedulers (and the whole block layer, in fact)
consider READs synchronous:

/*
 * We regard a request as sync, if either a read or a sync write
 */
static inline bool rw_is_sync(unsigned int rw_flags)
{
        return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC);
}
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