From: Christoph Hellwig <hch@lst.de>
To: axboe@suse.de
Cc: linux-kernel@vger.kernel.org
Subject: finding out whether a device supports ordered writes ahead of time
Date: Mon, 16 May 2005 13:27:22 +0200 [thread overview]
Message-ID: <20050516112722.GA9736@lst.de> (raw)
Currently ext3 and reiserfs submit bios with BIO_RW_BARRIER and when the
device doesn't support it it returns EOPNOTUPP. This scheme doesn't
work at all for XFS because our I/O submission path keeps around far too
much state (XFS supports multi-page metadata buffers). From looking at
the code it seems that we can assume such a submission will just work
if q->ordered is not QUEUE_ORDERED_NONE. Is that a valid assumption?
and if yes should we look directly at the queue or provide an assecor?
next reply other threads:[~2005-05-16 11:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-16 11:27 Christoph Hellwig [this message]
2005-05-16 12:12 ` finding out whether a device supports ordered writes ahead of time Chris Mason
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