linux-kernel - Re: [PATCH v2] io_uring: fix nr_segs calculation in io_import

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Message-Id: <176598217718.7122.7321090942996172863.b4-ty@kernel.dk>
Date: Wed, 17 Dec 2025 07:36:17 -0700
From: Jens Axboe <axboe@...nel.dk>
To: csander@...estorage.com, huang-jl <huang-jl@...pseek.com>
Cc: io-uring@...r.kernel.org, linux-block@...r.kernel.org, 
 linux-kernel@...r.kernel.org, ming.lei@...hat.com
Subject: Re: [PATCH v2] io_uring: fix nr_segs calculation in io_import_kbuf


On Wed, 17 Dec 2025 14:26:32 +0800, huang-jl wrote:
> io_import_kbuf() calculates nr_segs incorrectly when iov_offset is
> non-zero after iov_iter_advance(). It doesn't account for the partial
> consumption of the first bvec.
> 
> The problem comes when meet the following conditions:
> 1. Use UBLK_F_AUTO_BUF_REG feature of ublk.
> 2. The kernel will help to register the buffer, into the io uring.
> 3. Later, the ublk server try to send IO request using the registered
>    buffer in the io uring, to read/write to fuse-based filesystem, with
> O_DIRECT.
> 
> [...]

Applied, thanks!

[1/1] io_uring: fix nr_segs calculation in io_import_kbuf
      commit: 114ea9bbaf7681c4d363e13b7916e6fef6a4963a

Best regards,
-- 
Jens Axboe