From: Keith Busch <[email protected]>
To: Kanchan Joshi <[email protected]>
Cc: Keith Busch <[email protected]>,
[email protected], [email protected],
[email protected], [email protected], [email protected],
[email protected], [email protected]
Subject: Re: [PATCHv4 1/4] block: bio-integrity: directly map user buffers
Date: Wed, 29 Nov 2023 09:35:24 -0700 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On Wed, Nov 29, 2023 at 08:48:41PM +0530, Kanchan Joshi wrote:
> On 11/29/2023 3:57 AM, Keith Busch wrote:
> > If the user address can't directly be used for reason, like too many
> > segments or address unalignement, fallback to a copy of the user vec
> > while keeping the user address pinned for the IO duration so that it
> > can safely be copied on completion in any process context.
>
> The pinning requirement is only for read. But code keeps user-memory
> pinned for write too. Is there any reason?
It just makes the completion simpler. I'll split the cases so we unpin
on writes after the copy during setup.
next prev parent reply other threads:[~2023-11-29 16:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-28 22:27 [PATCHv4 0/4] block integrity: directly map user space addresses Keith Busch
2023-11-28 22:27 ` [PATCHv4 1/4] block: bio-integrity: directly map user buffers Keith Busch
2023-11-29 15:18 ` Kanchan Joshi
2023-11-29 16:35 ` Keith Busch [this message]
2023-11-28 22:27 ` [PATCHv4 2/4] nvme: use bio_integrity_map_user Keith Busch
2023-11-28 22:27 ` [PATCHv4 3/4] iouring: remove IORING_URING_CMD_POLLED Keith Busch
2023-11-28 22:27 ` [PATCHv4 4/4] io_uring: remove uring_cmd cookie Keith Busch
2023-11-29 1:37 ` [PATCHv4 0/4] block integrity: directly map user space addresses Martin K. Petersen
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