From: Christoph Hellwig <hch@infradead.org>
To: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Cc: linux-ide@vger.kernel.org, linux-block@vger.kernel.org,
Jens Axboe <axboe@kernel.dk>,
"Maciej S . Szmigiero" <mail@maciej.szmigiero.name>,
Hannes Reinecke <hare@suse.de>
Subject: Re: [PATCH v4 1/7] block: Prevent the use of REQ_FUA with read operations
Date: Tue, 1 Nov 2022 08:09:52 -0700 [thread overview]
Message-ID: <Y2E2wFnbeUzAPjo0@infradead.org> (raw)
In-Reply-To: <20221031022642.352794-2-damien.lemoal@opensource.wdc.com>
On Mon, Oct 31, 2022 at 11:26:36AM +0900, Damien Le Moal wrote:
> + /*
> + * REQ_FUA does not apply to read requests because:
> + * - There is no way to reliably force media access for read operations
> + * with a block device that does not support FUA.
> + * - Not all block devices support FUA for read operations (e.g. ATA
> + * devices with NCQ support turned off).
> + */
> + if (!op_is_write(rq->cmd_flags) && (rq->cmd_flags & REQ_FUA)) {
> + blk_mq_end_request(rq, BLK_STS_NOTSUPP);
How could this even happen? If we want a debug check, I think it
should be in submit_bio and a WARN_ON_ONCE.
next prev parent reply other threads:[~2022-11-01 15:14 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-31 2:26 [PATCH v4 0/7] Improve libata support for FUA Damien Le Moal
2022-10-31 2:26 ` [PATCH v4 1/7] block: Prevent the use of REQ_FUA with read operations Damien Le Moal
2022-11-01 15:09 ` Christoph Hellwig [this message]
2022-11-01 22:05 ` Damien Le Moal
2022-11-02 7:09 ` Christoph Hellwig
2022-11-02 7:27 ` Damien Le Moal
2022-11-02 15:17 ` Jens Axboe
2022-11-02 22:28 ` Damien Le Moal
2022-11-03 7:49 ` Christoph Hellwig
2022-11-05 15:32 ` Jens Axboe
2022-10-31 2:26 ` [PATCH v4 2/7] ata: libata: Introduce ata_ncq_supported() Damien Le Moal
2022-10-31 2:26 ` [PATCH v4 3/7] ata: libata: Rename and cleanup ata_rwcmd_protocol() Damien Le Moal
2022-10-31 2:26 ` [PATCH v4 4/7] ata: libata: cleanup fua support detection Damien Le Moal
2022-10-31 2:26 ` [PATCH v4 5/7] ata: libata: Fix FUA handling in ata_build_rw_tf() Damien Le Moal
2022-10-31 2:26 ` [PATCH v4 6/7] ata: libata: blacklist FUA support for known buggy drives Damien Le Moal
2022-10-31 2:26 ` [PATCH v4 7/7] ata: libata: Enable fua support by default Damien Le Moal
-- strict thread matches above, loose matches on Subject: below --
2022-10-31 1:53 [PATCH v4 0/7] Damien Le Moal
2022-10-31 1:53 ` [PATCH v4 1/7] block: Prevent the use of REQ_FUA with read operations Damien Le Moal
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Y2E2wFnbeUzAPjo0@infradead.org \
--to=hch@infradead.org \
--cc=axboe@kernel.dk \
--cc=damien.lemoal@opensource.wdc.com \
--cc=hare@suse.de \
--cc=linux-block@vger.kernel.org \
--cc=linux-ide@vger.kernel.org \
--cc=mail@maciej.szmigiero.name \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).