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From: Kanchan Joshi <[email protected]>
To: Christoph Hellwig <[email protected]>
Cc: "Kanchan Joshi" <[email protected]>,
	"Jens Axboe" <[email protected]>,
	[email protected], [email protected],
	"Pavel Begunkov" <[email protected]>,
	"Ming Lei" <[email protected]>,
	"Luis Chamberlain" <[email protected]>,
	"Pankaj Raghav" <[email protected]>,
	"Javier González" <[email protected]>,
	"Anuj Gupta" <[email protected]>
Subject: Re: [RFC 5/5] nvme: wire-up support for async-passthru on char-device.
Date: Mon, 25 Apr 2022 23:08:03 +0530	[thread overview]
Message-ID: <20220425173803.GA2454@test-zns> (raw)
In-Reply-To: <[email protected]>

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On Sat, Apr 23, 2022 at 07:53:09PM +0200, Christoph Hellwig wrote:
>On Wed, Apr 06, 2022 at 10:50:14AM +0530, Kanchan Joshi wrote:
>> > In that case we will base the newer version on its top.
>> But if it saves some cycles for you, and also the travel from nvme to
>> linux-block tree - I can carry that refactoring as a prep patch in
>> this series. Your call.
>
>FYI, this is what I have so far:
>
>http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/nvme-passthrough-refactor
>
>the idea would be to use these lower level helpers for uring, and
>not really share the higher level function at all.  This does create
>a little extra code, but I think it'll be more modular and better
>maintainable.  Feel free to pull this in if it helps you, otherwise
>I'll try to find some time to do more than just light testing and
>will post it.

Thanks for sharing.
So I had picked your previous version, and this one streamlines meta
handling further. But the problem is bip gets freed before we reach to
this point -

+static int nvme_free_user_metadata(struct bio *bio, void __user *ubuf, int ret)
+{
+       struct bio_integrity_payload *bip = bio_integrity(bio);
+       void *buf = bvec_virt(bip->bip_vec);
+
+       if (!ret && bio_op(bio) == REQ_OP_DRV_IN &&
+           copy_to_user(ubuf, buf, bip->bip_vec->bv_len))

Without bip, we cannot kill current meta/meta_len fields.


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  reply	other threads:[~2022-04-26  4:20 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20220401110829epcas5p39f3cf4d3f6eb8a5c59794787a2b72b15@epcas5p3.samsung.com>
2022-04-01 11:03 ` [RFC 0/5] big-cqe based uring-passthru Kanchan Joshi
     [not found]   ` <CGME20220401110831epcas5p403bacabe8f7e5262356fdc1a2e66df90@epcas5p4.samsung.com>
2022-04-01 11:03     ` [RFC 1/5] io_uring: add support for 128-byte SQEs Kanchan Joshi
     [not found]   ` <CGME20220401110833epcas5p18e828a307a646cef5b7aa429be4396e0@epcas5p1.samsung.com>
2022-04-01 11:03     ` [RFC 2/5] fs: add file_operations->async_cmd() Kanchan Joshi
2022-04-04  7:09       ` Christoph Hellwig
     [not found]   ` <CGME20220401110834epcas5p4d1e5e8d1beb1a6205d670bbcb932bf77@epcas5p4.samsung.com>
2022-04-01 11:03     ` [RFC 3/5] io_uring: add infra and support for IORING_OP_URING_CMD Kanchan Joshi
2022-04-04  7:16       ` Christoph Hellwig
2022-04-04  8:20         ` Pavel Begunkov
2022-04-05  5:58           ` Christoph Hellwig
2022-04-06  6:37             ` Kanchan Joshi
2022-04-04 15:14         ` Kanchan Joshi
2022-04-05  6:00           ` Christoph Hellwig
2022-04-05 16:27             ` Kanchan Joshi
     [not found]   ` <CGME20220401110836epcas5p37bd59ab5a48cf77ca3ac05052a164b0b@epcas5p3.samsung.com>
2022-04-01 11:03     ` [RFC 4/5] io_uring: add support for big-cqe Kanchan Joshi
2022-04-04  7:07       ` Christoph Hellwig
2022-04-04 14:04         ` Kanchan Joshi
     [not found]   ` <CGME20220401110838epcas5p2c1a2e776923dfe5bf65a3e7946820150@epcas5p2.samsung.com>
2022-04-01 11:03     ` [RFC 5/5] nvme: wire-up support for async-passthru on char-device Kanchan Joshi
2022-04-04  7:20       ` Christoph Hellwig
2022-04-04 14:25         ` Kanchan Joshi
2022-04-05  6:02           ` Christoph Hellwig
2022-04-05 15:40             ` Jens Axboe
2022-04-05 15:49             ` Kanchan Joshi
2022-04-06  5:20               ` Kanchan Joshi
2022-04-06  5:23                 ` Christoph Hellwig
2022-04-23 17:53                 ` Christoph Hellwig
2022-04-25 17:38                   ` Kanchan Joshi [this message]
2022-04-29 13:16                     ` Kanchan Joshi
2022-04-04  7:21   ` [RFC 0/5] big-cqe based uring-passthru Christoph Hellwig
2022-04-05 15:37     ` Kanchan Joshi

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