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From: Ming Lei <[email protected]>
To: Keith Busch <[email protected]>
Cc: Keith Busch <[email protected]>,
	[email protected], [email protected],
	[email protected], [email protected]
Subject: Re: [PATCH 0/6] ublk zero-copy support
Date: Sat, 8 Feb 2025 15:52:14 +0800	[thread overview]
Message-ID: <Z6cNLuVOyYZ8N-yU@fedora> (raw)
In-Reply-To: <Z6YTfi29FcSQ1cSe@kbusch-mbp>

On Fri, Feb 07, 2025 at 07:06:54AM -0700, Keith Busch wrote:
> On Fri, Feb 07, 2025 at 11:51:49AM +0800, Ming Lei wrote:
> > On Mon, Feb 03, 2025 at 07:45:11AM -0800, Keith Busch wrote:

...

> > Does this interface support to read to partial buffer? Which is useful
> > for stacking device cases.
> 
> Are you wanting to read into this buffer without copying in parts? As in
> provide an offset and/or smaller length across multiple commands? If
> that's what you mean, then yes, you can do that here.

Sorry, forget another problem here.

For short read, we need to zero the remained bytes in each part of buffer,
how to deal with that?

Please see io_req_zero_remained() in my patch of "[PATCH V10 10/12] io_uring:
support leased group buffer with REQ_F_GROUP_BUF":

https://lore.kernel.org/linux-block/[email protected]/#r



Thanks,
Ming


  parent reply	other threads:[~2025-02-08  7:52 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-02-03 15:45 [PATCH 0/6] ublk zero-copy support Keith Busch
2025-02-03 15:45 ` [PATCH 1/6] block: const blk_rq_nr_phys_segments request Keith Busch
2025-02-03 15:45 ` [PATCH 2/6] io_uring: use node for import Keith Busch
2025-02-03 15:45 ` [PATCH 3/6] io_uring: add support for kernel registered bvecs Keith Busch
2025-02-07 14:08   ` Pavel Begunkov
2025-02-07 15:17     ` Keith Busch
2025-02-08 15:49       ` Pavel Begunkov
2025-02-10 14:12   ` Ming Lei
2025-02-10 15:05     ` Keith Busch
2025-02-03 15:45 ` [PATCH 4/6] ublk: zc register/unregister bvec Keith Busch
2025-02-08  5:50   ` Ming Lei
2025-02-03 15:45 ` [PATCH 5/6] io_uring: add abstraction for buf_table rsrc data Keith Busch
2025-02-03 15:45 ` [PATCH 6/6] io_uring: cache nodes and mapped buffers Keith Busch
2025-02-07 12:41   ` Pavel Begunkov
2025-02-07 15:33     ` Keith Busch
2025-02-08 14:00       ` Pavel Begunkov
2025-02-07 15:59     ` Keith Busch
2025-02-08 14:24       ` Pavel Begunkov
2025-02-06 15:28 ` [PATCH 0/6] ublk zero-copy support Keith Busch
2025-02-07  3:51 ` Ming Lei
2025-02-07 14:06   ` Keith Busch
2025-02-08  5:44     ` Ming Lei
2025-02-08 14:16       ` Pavel Begunkov
2025-02-08 20:13         ` Keith Busch
2025-02-08 21:40           ` Pavel Begunkov
2025-02-08  7:52     ` Ming Lei [this message]
2025-02-08  0:51 ` Bernd Schubert

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