linux-kernel - Re: Asynchronous scsi scanning

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Message-ID: <a781481a0705171147s1ef5c205y8873d0bfa201f928@mail.gmail.com>
Date:	Fri, 18 May 2007 00:17:40 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Christoph Hellwig" <hch@...radead.org>,
	"Benjamin LaHaise" <bcrl@...ck.org>,
	"Matthew Wilcox" <matthew@....cx>,
	"Simon Arlott" <simon@...e.lp0.eu>,
	"James Bottomley" <james.bottomley@...eleye.com>,
	"Dave Jones" <davej@...hat.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org, kernel-packagers@...r.kernel.org,
	"Robert P. J. Day" <rpjday@...dspring.com>
Subject: Re: Asynchronous scsi scanning

Hi Christoph,

On 5/17/07, Christoph Hellwig <hch@...radead.org> wrote:
> On Thu, May 17, 2007 at 11:11:10PM +0530, Satyam Sharma wrote:
> > Another command to /proc/scsi/scsi isn't a bad thought at all, considering
>
> Yes it is.  /proc/scsi/scsi is a horrible interface and deprecated since
> the start of the 2.6 series.

What I have in mind is actually this: We implement commands to
trigger the scsi_complete_async_scans() using *both* the
(legacy, agreed) /proc/scsi/scsi interface _and_ using a sysfs
attribute for this (either in /sys/module/scsi_mod/parameter/, using
a module_param_call as Roland suggested, or, create a new
/sys/module/scsi_mod/<whatever>/wait_..., whatever is appropriate).

/proc/scsi/scsi is now deprecated _because_ the sysfs alternative
became available, after all (we couldn't pull functionality /
interfaces previously exposed to userspace from under them
without giving equivalent alternatives anyway).

However, Ben does have a point that we shouldn't force those
using SCSI (and wishing to use the new async scanning
feature) to depend on and use sysfs too, so those like him could
use /proc/scsi/scsi. The idea is that with time sysfs gets its act
together and thus becomes standard enough on all Linux boxen
(much like /proc is today), and those like Ben could later switch
to that.
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