From: Jens Axboe <axboe@kernel.dk>
To: Pavel Machek <pavel@denx.de>, Sasha Levin <sashal@kernel.org>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Kent Overstreet <kent.overstreet@linux.dev>,
linux-block@vger.kernel.org
Subject: Re: [PATCH AUTOSEL 6.1 20/22] block: Allow bio_iov_iter_get_pages() with bio->bi_bdev unset
Date: Mon, 11 Sep 2023 07:15:18 -0600 [thread overview]
Message-ID: <d6da7de6-e603-4fb3-b68e-8d919f26fefe@kernel.dk> (raw)
In-Reply-To: <ZP7j2MA5Qk6RBtAd@duo.ucw.cz>
On 9/11/23 3:54 AM, Pavel Machek wrote:
> Hi!
>
>> From: Kent Overstreet <kent.overstreet@linux.dev>
>>
>> [ Upstream commit 168145f617d57bf4e474901b7ffa869337a802e6 ]
>>
>> bio_iov_iter_get_pages() trims the IO based on the block size of the
>> block device the IO will be issued to.
>>
>> However, bcachefs is a multi device filesystem; when we're creating the
>> bio we don't yet know which block device the bio will be submitted to -
>> we have to handle the alignment checks elsewhere.
>>
>> Thus this is needed to avoid a null ptr deref.
>
> We are certainly not going to backport bcachefs to -stable. Please
> drop.
I already said as much 3 days ago:
https://lore.kernel.org/all/cd341326-cfaf-4796-8894-2241e7b630d9@kernel.dk/
but didn't hear back yet.
--
Jens Axboe
next prev parent reply other threads:[~2023-09-11 21:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230908193407.3463368-1-sashal@kernel.org>
2023-09-08 19:34 ` [PATCH AUTOSEL 6.1 20/22] block: Allow bio_iov_iter_get_pages() with bio->bi_bdev unset Sasha Levin
2023-09-11 9:54 ` Pavel Machek
2023-09-11 13:15 ` Jens Axboe [this message]
2023-09-18 20:57 ` Sasha Levin
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