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Re: [Qemu-devel] [PATCH v7 00/10] qemu-img convert with copy offloading

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH v7 00/10] qemu-img convert with copy offloading
Date: Wed, 30 May 2018 17:06:47 +0100
User-agent: Mutt/1.9.5 (2018-04-13)

On Tue, May 29, 2018 at 01:59:49PM +0800, Fam Zheng wrote:
> v7: Fix qcow2.
> v6: Pick up rev-by from Stefan and Eric.
>     Tweak patch 2 commit message.
> v5: - Fix raw offset/bytes check for read. [Eric]
>     - Fix qcow2_handle_l2meta. [Stefan]
>     - Add coroutine_fn whereever appropriate. [Stefan]
> v4: - Fix raw offset and size. [Eric]
>     - iscsi: Drop unnecessary return values and variables in favor of
>       constants. [Stefan]
>     - qcow2: Handle small backing case. [Stefan]
>     - file-posix: Translate ENOSYS to ENOTSUP. [Stefan]
>     - API documentation and commit message. [Stefan]
>     - Add rev-by to patches 3, 5 - 10. [Stefan, Eric]
> This series introduces block layer API for copy offloading and makes use of it
> in qemu-img convert.
> For now we implemented the operation in local file protocol with
> copy_file_range(2).  Besides that it's possible to add similar to iscsi, nfs
> and potentially more.
> As far as its usage goes, in addition to qemu-img convert, we can emulate
> offloading in scsi-disk (handle EXTENDED COPY command), and use the API in
> block jobs too.

Fails to compile on Fedora 28.

Oops, I guess my glibc is too new.  This type of bug doesn't happen very
often :D :D :D.

block/file-posix.c:1452:14: error: static declaration of ‘copy_file_range’ 
follows non-static declaration
 static off_t copy_file_range(int in_fd, off_t *in_off, int out_fd,
In file included from /home/stefanha/qemu/include/qemu/osdep.h:75,
                 from block/file-posix.c:25:
/usr/include/unistd.h:1107:9: note: previous declaration of ‘copy_file_range’ 
was here
 ssize_t copy_file_range (int __infd, __off64_t *__pinoff,

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