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References: <20210512161848.3513818-1-rjones@redhat.com> <20210512161848.3513818-2-rjones@redhat.com>
In-Reply-To: <20210512161848.3513818-2-rjones@redhat.com>
From:   Miklos Szeredi <miklos@szeredi.hu>
Date:   Tue, 18 May 2021 15:56:25 +0200
Message-ID: <CAJfpegv=C-tUwbAi+JMWrNb+pai=HiAU8YCDunE5yUZB7qMK1g@mail.gmail.com>
Subject: Re: [PATCH v4] fuse: Allow fallocate(FALLOC_FL_ZERO_RANGE)
To:     "Richard W.M. Jones" <rjones@redhat.com>
Cc:     linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        eblake@redhat.com, libguestfs@redhat.com,
        Shachar Sharon <synarete@gmail.com>
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On Wed, 12 May 2021 at 18:19, Richard W.M. Jones <rjones@redhat.com> wrote:
>
> The current fuse module filters out fallocate(FALLOC_FL_ZERO_RANGE)
> returning -EOPNOTSUPP.  libnbd's nbdfuse would like to translate
> FALLOC_FL_ZERO_RANGE requests into the NBD command
> NBD_CMD_WRITE_ZEROES which allows NBD servers that support it to do
> zeroing efficiently.
>
> This commit treats this flag exactly like FALLOC_FL_PUNCH_HOLE.

Thanks, applied.

Miklos