From: Andrew Morton <akpm@linux-foundation.org>
To: Johann Lombardi <johann@clusterfs.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Clear PG_error before reading a page
Date: Thu, 17 May 2007 09:47:30 -0700 [thread overview]
Message-ID: <20070517094730.5cdfaa64.akpm@linux-foundation.org> (raw)
In-Reply-To: <20070517114250.GA2141@chiva>
On Thu, 17 May 2007 13:42:50 +0200 Johann Lombardi <johann@clusterfs.com> wrote:
> > What is the actual real-world operational scenario here? Would it be a
> > hotplugged disk? A transient network failure in a SAN? IOW, is it
> > something from which the kernel should automatically recover, or it is a
> > situation in which manual intervention would be better?
>
> The real-world operational scenario is a storage system reporting medium
> errors which can be corrected by a manual intervention.
So running ioctl(BLKFLSBUF) against the device will fix things up?
Perhaps not, and we should invalidate all the file data as well. The
only ways we have of doing that are umount+mount or /proc/sys/vm/drop_caches.
I'm not sure what is the best thing to do here - there are advantages to
caching the fact that the device (or some of it) is unreadable.
next prev parent reply other threads:[~2007-05-17 16:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-15 14:37 Clear PG_error before reading a page Johann Lombardi
2007-05-15 17:11 ` Andrew Morton
2007-05-15 21:01 ` Johann Lombardi
2007-05-15 21:23 ` Andrew Morton
2007-05-16 15:39 ` Johann Lombardi
2007-05-16 15:49 ` Nick Piggin
2007-05-16 16:12 ` Andrew Morton
2007-05-17 11:42 ` Johann Lombardi
2007-05-17 16:47 ` Andrew Morton [this message]
2007-05-29 17:06 ` Johann Lombardi
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