From: Kent Overstreet <koverstreet@google.com>
To: Namjae Jeon <linkinjeon@gmail.com>
Cc: dwmw2@infradead.org, axboe@kernel.dk, shli@kernel.org,
Paul.Clements@steeleye.com, npiggin@kernel.dk, neilb@suse.de,
cjb@laptop.org, adrian.hunter@intel.com,
James.Bottomley@HansenPartnership.com, JBottomley@parallels.com,
linux-scsi@vger.kernel.org, linux-mtd@lists.infradead.org,
nbd-general@lists.sourceforge.net, linux-raid@vger.kernel.org,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
jcmvbkbc@gmail.com, Namjae Jeon <namjae.jeon@samsung.com>
Subject: Re: [PATCH v2 0/9] fix max discard sectors limit
Date: Mon, 22 Apr 2013 14:23:24 -0700 [thread overview]
Message-ID: <20130422212324.GB4704@localhost> (raw)
In-Reply-To: <1366389602-19313-1-git-send-email-linkinjeon@gmail.com>
On Sat, Apr 20, 2013 at 01:40:02AM +0900, Namjae Jeon wrote:
> From: Namjae Jeon <namjae.jeon@samsung.com>
>
> linux-v3.8-rc1 and later support for plug for blkdev_issue_discard with
> commit 0cfbcafcae8b7364b5fa96c2b26ccde7a3a296a9
> (block: add plug for blkdev_issue_discard )
>
> For example,
> 1) DISCARD rq-1 with size size 4GB
> 2) DISCARD rq-2 with size size 1GB
>
> If these 2 discard requests get merged, final request size will be 5GB.
>
> In this case, request's __data_len field may overflow as it can store
> max 4GB(unsigned int).
Complete NACK - like James said, this fix is nonsensical. This should be
fixed by just checking for overflow before merging requests, not with
weird hacks in the drivers.
next prev parent reply other threads:[~2013-04-22 21:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-19 16:40 [PATCH v2 0/9] fix max discard sectors limit Namjae Jeon
2013-04-20 19:50 ` James Bottomley
2013-04-21 1:37 ` Namjae Jeon
2013-04-26 7:33 ` Hannes Reinecke
2013-04-22 21:23 ` Kent Overstreet [this message]
2013-04-23 5:16 ` Namjae Jeon
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