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From: David Howells <dhowells@redhat.com>
To: Dominique Martinet <asmadeus@codewreck.org>
Cc: dhowells@redhat.com, Eric Van Hensbergen <ericvh@gmail.com>,
	Latchesar Ionkov <lucho@ionkov.net>,
	v9fs-developer@lists.sourceforge.net, linux-cachefs@redhat.com,
	linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] 9p: Convert to new fscache API
Date: Wed, 18 Nov 2020 15:02:58 +0000	[thread overview]
Message-ID: <1787400.1605711778@warthog.procyon.org.uk> (raw)
In-Reply-To: <20201118141649.GA14211@nautica>

Dominique Martinet <asmadeus@codewreck.org> wrote:

> I take it the read helper would just iterate as long as there's data
> still required to read, writing from THPs wouldn't do that?

Yep.  As long as you read some data, the helper will call you again if you
didn't read everything.  subreq->transferred keeps track of what has been read
so far.  You can also tell the helper just to clear the rest by setting
NETFS_SREQ_CLEAR_TAIL.

The helper tries to hide the pages from you as far as possible.  Using
ITER_XARRAY hides that even more.

David


  parent reply	other threads:[~2020-11-18 15:03 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-18 11:02 David Howells
2020-11-18 11:43 ` David Howells
2020-11-18 12:00 ` David Howells
2020-11-18 12:48 ` Dominique Martinet
2020-11-18 13:38 ` David Howells
2020-11-18 14:16   ` Dominique Martinet
2020-11-18 15:02   ` David Howells [this message]
2020-11-18 14:59 ` David Howells

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