linux-kernel - Re: [PATCH] block: flip iter directions in blk_rq_integrity_map

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Message-ID: <e37d8707-8770-4f20-a04a-b77359c5bc32@kernel.dk>
Date: Tue, 3 Jun 2025 12:54:05 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Caleb Sander Mateos <csander@...estorage.com>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: flip iter directions in
 blk_rq_integrity_map_user()

On 6/3/25 12:47 PM, Caleb Sander Mateos wrote:
> blk_rq_integrity_map_user() creates the ubuf iter with ITER_DEST for
> write-direction operations and ITER_SOURCE for read-direction ones.
> This is backwards; writes use the user buffer as a source for metadata
> and reads use it as a destination. Switch to the rq_data_dir() helper,
> which maps writes to ITER_SOURCE (WRITE) and reads to ITER_DEST(READ).

Was going to ask "how did this ever work without splats", but looks like
a fairly recent change AND it's for integrity which isn't widely used.
But it does show a gap in testing for sure.

-- 
Jens Axboe