From: Christoph Hellwig <hch@infradead.org>
To: Michal Novotny <minovotn@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Ric Wheeler <rwheeler@redhat.com>,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] extend e2fsprogs functionality to add EXT2_FLAG_DIRECT option
Date: Tue, 12 Jan 2010 11:47:48 -0500 [thread overview]
Message-ID: <20100112164748.GA26895@infradead.org> (raw)
In-Reply-To: <4B4CA6A9.3030401@redhat.com>
On Tue, Jan 12, 2010 at 05:43:21PM +0100, Michal Novotny wrote:
> So, do you think the problem is in the Xen backend drivers and to make
> it working right in Xen the driver fix is needed?
Yes, the Xen blkback driver just submits I/O directly without using
the right interfaces to force cache coherency. It might be relatively
easy to hack a call in to flush all caches when it starts up, but given
how it bypasses all abstractions it's almost impossible to give full
coherency as if using the normal block device interfaces.
next prev parent reply other threads:[~2010-01-12 16:47 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-08 9:36 [PATCH] extend e2fsprogs functionality to add EXT2_FLAG_DIRECT option Michal Novotny
2010-01-11 20:06 ` Ric Wheeler
2010-01-12 10:54 ` Michal Novotny
2010-01-12 11:59 ` Ric Wheeler
2010-01-12 12:15 ` Michal Novotny
2010-01-12 12:23 ` Christoph Hellwig
2010-01-12 12:30 ` Michal Novotny
2010-01-12 12:46 ` Christoph Hellwig
2010-01-12 13:01 ` Michal Novotny
2010-01-12 13:04 ` Ric Wheeler
2010-01-12 13:12 ` Michal Novotny
2010-01-12 13:23 ` Michal Novotny
2010-01-12 13:29 ` Ric Wheeler
2010-01-12 13:33 ` Michal Novotny
2010-01-12 14:33 ` Chris Lee
2010-01-12 14:37 ` Michal Novotny
2010-01-12 16:38 ` Christoph Hellwig
2010-01-12 16:43 ` Michal Novotny
2010-01-12 16:47 ` Christoph Hellwig [this message]
2010-01-12 16:51 ` Michal Novotny
2010-01-12 16:50 ` Ric Wheeler
2010-01-12 16:53 ` Michal Novotny
2010-01-12 16:56 ` Eric Sandeen
2010-01-12 16:59 ` Ric Wheeler
2010-01-12 17:00 ` Michal Novotny
2010-01-14 13:46 ` Michal Novotny
2010-01-12 12:47 ` Andreas Dilger
2010-01-12 13:04 ` Michal Novotny
2010-01-12 15:16 ` Eric Sandeen
2010-01-12 15:46 ` Michal Novotny
2010-01-12 20:01 ` Ric Wheeler
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20100112164748.GA26895@infradead.org \
--to=hch@infradead.org \
--cc=linux-ext4@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=minovotn@redhat.com \
--cc=rwheeler@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).