From: Omar Sandoval <osandov@osandov.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-btrfs <linux-btrfs@vger.kernel.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Christoph Hellwig <hch@infradead.org>,
Dave Chinner <david@fromorbit.com>, Jann Horn <jannh@google.com>,
Amir Goldstein <amir73il@gmail.com>,
Aleksa Sarai <cyphar@cyphar.com>,
Linux API <linux-api@vger.kernel.org>,
Kernel Team <kernel-team@fb.com>
Subject: Re: [PATCH RERESEND v9 0/9] fs: interface for directly reading/writing compressed data
Date: Mon, 7 Jun 2021 12:27:07 -0700 [thread overview]
Message-ID: <YL5zCxGx/J1WxSCq@relinquished.localdomain> (raw)
In-Reply-To: <CAHk-=wh74eFxL0f_HSLUEsD1OQfFNH9ccYVgCXNoV1098VCV6Q@mail.gmail.com>
On Mon, May 17, 2021 at 02:32:47PM -0700, Linus Torvalds wrote:
> On Mon, May 17, 2021 at 11:35 AM Omar Sandoval <osandov@osandov.com> wrote:
> >
> > Patches 1-3 add the VFS support, UAPI, and documentation. Patches 4-7
> > are Btrfs prep patches. Patch 8 adds Btrfs encoded read support and
> > patch 9 adds Btrfs encoded write support.
>
> I don't love the RWF_ENCODED flag, but if that's the way people think
> this should be done, as a model this looks reasonable to me.
>
> I'm not sure what the deal with the encryption metadata is. I realize
> there is currently only one encryption type ("none") in this series,
> but it's not clear how any other encryption type would actually ever
> be described. It's not like you can pass in the key (well, I guess
> passing in the key would be fine, but passing it back out certainly
> would not be). A key ID from a keyring?
>
> So there's presumably some future plan for it, but it would be good to
> verify that that plan makes sense..
To summarize the discussion and answer your original question, using
RWF_ENCODED for encryption will require additional support for getting
encryption metadata, but that support is best suited for a separate
interface, with RWF_ENCODED purely for the encrypted data itself. The
harder part of encrypted backups is restoring filenames, and that would
also be best as a separate interface.
My use case is only for compression, so none of that is a blocker for
RWF_ENCODED.
What else can I do to move this along?
Thanks,
Omar
prev parent reply other threads:[~2021-06-07 19:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-17 18:35 [PATCH RERESEND v9 0/9] fs: interface for directly reading/writing compressed data Omar Sandoval
2021-05-17 18:35 ` [PATCH RERESEND v9 1/9] iov_iter: add copy_struct_from_iter() Omar Sandoval
2021-05-17 18:35 ` [PATCH RERESEND v9 2/9] fs: add O_ALLOW_ENCODED open flag Omar Sandoval
2021-05-17 18:35 ` [PATCH RERESEND v9 3/9] fs: add RWF_ENCODED for reading/writing compressed data Omar Sandoval
2021-05-17 18:35 ` [PATCH RERESEND v9 4/9] btrfs: don't advance offset for compressed bios in btrfs_csum_one_bio() Omar Sandoval
2021-05-17 18:35 ` [PATCH RERESEND v9 5/9] btrfs: add ram_bytes and offset to btrfs_ordered_extent Omar Sandoval
2021-05-17 18:35 ` [PATCH RERESEND v9 6/9] btrfs: support different disk extent size for delalloc Omar Sandoval
2021-05-17 18:35 ` [PATCH RERESEND v9 7/9] btrfs: optionally extend i_size in cow_file_range_inline() Omar Sandoval
2021-05-17 18:35 ` [PATCH RERESEND v9 8/9] btrfs: implement RWF_ENCODED reads Omar Sandoval
2021-05-17 18:35 ` [PATCH RERESEND v9 9/9] btrfs: implement RWF_ENCODED writes Omar Sandoval
2021-05-17 21:32 ` [PATCH RERESEND v9 0/9] fs: interface for directly reading/writing compressed data Linus Torvalds
2021-05-17 22:27 ` Omar Sandoval
2021-05-17 22:48 ` Eric Biggers
2021-05-17 23:25 ` Omar Sandoval
2021-05-18 0:07 ` Eric Biggers
2021-05-18 2:53 ` Theodore Y. Ts'o
2021-05-18 8:38 ` Omar Sandoval
2021-05-18 16:21 ` Theodore Y. Ts'o
2021-06-07 19:27 ` Omar Sandoval [this message]
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