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From: Nikolaus Rath <Nikolaus@rath.org>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: fuse-devel <fuse-devel@lists.sourceforge.net>,
	Miklos Szeredi <mszeredi@redhat.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [fuse-devel] [fuse] How to trigger writeback?
Date: Thu, 27 Sep 2018 09:28:29 +0100	[thread overview]
Message-ID: <87zhw3qr82.fsf@thinkpad.rath.org> (raw)
In-Reply-To: <CAJfpegvAhW4UUhD+SziLHsagPY=BLyZU0MKOov8z18woywyxDw@mail.gmail.com> (Miklos Szeredi's message of "Tue, 25 Sep 2018 10:48:37 +0200")

On Sep 25 2018, Miklos Szeredi <miklos@szeredi.hu> wrote:
> On Tue, Sep 25, 2018 at 10:30 AM, Nikolaus Rath <Nikolaus@rath.org> wrote:
>> On Sep 24 2018, Miklos Szeredi <miklos@szeredi.hu> wrote:
>>> On Mon, Sep 24, 2018 at 10:02 AM, Nikolaus Rath <Nikolaus@rath.org> wrote:
>>>> Hi,
>>>>
>>>> How do I trigger writeback from a (writeback-cache enabled) FUSE
>>>> filesystem?
>>>
>>> No way, currently (well, triggering fsync(2)/fdatasync(2) on the
>>> filesystem would work, but such recursion is considered highly
>>> hackish).
>>
>>
>> You mean sync(2)/syncfs(2), not fsync(), right? Unless my manpages are
>> out of date, fsync() only works on a specific inode.
>
> I would've thought you only need writeback of a specific inode for reflink, no?

Aeh, yeah, I did not mention that. Since I couldn't implement real
reflink support but have to go through xattrs, my "reflink" also
supports reflinking entire directory trees. I guess I could still issue
a bunch of fsyncs(), but I think syncfs() is nicer (I can even move it
into the client program that sets the magic xattr so that the filesystem
does not call into itself).


Best,
-Nikolaus

-- 
GPG Fingerprint: ED31 791B 2C5C 1613 AF38 8B8A D113 FCAC 3C4E 599F

             »Time flies like an arrow, fruit flies like a Banana.«

      reply	other threads:[~2018-09-27 14:45 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-24  8:02 Nikolaus Rath
2018-09-24  8:15 ` Miklos Szeredi
2018-09-25  8:30   ` [fuse-devel] " Nikolaus Rath
2018-09-25  8:48     ` Miklos Szeredi
2018-09-27  8:28       ` Nikolaus Rath [this message]

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