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From: Amir Goldstein <amir73il@gmail.com>
To: Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc: linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Christoph Hellwig <hch@lst.de>,
	overlayfs <linux-unionfs@vger.kernel.org>,
	Dave Chinner <david@fromorbit.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Anna Schumaker <Anna.Schumaker@netapp.com>
Subject: Re: [PATCH v2 0/4] Enable holes in copy_file_range()
Date: Thu, 10 May 2018 07:47:42 +0300	[thread overview]
Message-ID: <CAOQ4uxiDi9fFGhXxWH-pvDDP-8rk9cmwedLcsid3L51KyP8fbA@mail.gmail.com> (raw)
In-Reply-To: <20180510015820.17700-1-rgoldwyn@suse.de>

On Thu, May 10, 2018 at 4:58 AM, Goldwyn Rodrigues <rgoldwyn@suse.de> wrote:
> If copy_file_range performs a copy using splice, it converts holes
> to zeros. This effort primarily changes this behavior to create
> holes when it is possible.
>
> Even if copy_file_range() or clone_file_range() does not work for different
> mounted filesystems, We should be able to splice files if they do not
> belong the same super_block.
>
> Changes since v1:
> - Fixed bug when hole/data offset is farther than len

Please specify how you tested this work.
Did you run the xfstests generic/copy tests that Anna wrote?
If the tests caught your bugs - good, if they didn't, please
write more tests to cover the issues you found.
One thing I do not see in the existing tests is coverage for the
trivial case of "only holes" (i.e. touch x; truncate -s 10 x).

Thanks,
Amir.

  parent reply	other threads:[~2018-05-10  4:47 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-10  1:58 [PATCH v2 0/4] Enable holes in copy_file_range() Goldwyn Rodrigues
2018-05-10  1:58 ` [PATCH 1/4] copy_file_range: refactor vfs_copy_file_range Goldwyn Rodrigues
2018-05-10  1:58 ` [PATCH 2/4] copy_file_range: Perform splice if in/out SB are not same Goldwyn Rodrigues
2018-05-10  1:58 ` [PATCH 3/4] copy_file_range: splice with holes Goldwyn Rodrigues
2018-05-10  4:42   ` Amir Goldstein
2018-05-10  5:49     ` Amir Goldstein
2018-05-10  1:58 ` [PATCH 4/4] ovl: Use do_copy_file_range() in copy_up_data() Goldwyn Rodrigues
2018-05-10  4:47 ` Amir Goldstein [this message]
2018-05-10 10:45   ` [PATCH v2 0/4] Enable holes in copy_file_range() Anna Schumaker

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