From: Mark Lord <liml@rtr.ca>
To: Matthew Wilcox <willy@linux.intel.com>
Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org,
jgarzik@redhat.com, Matthew Wilcox <matthew@wil.cx>
Subject: Re: [PATCH 1/5] Block: Discard may need to allocate pages
Date: Fri, 17 Apr 2009 17:23:42 -0400 [thread overview]
Message-ID: <49E8F35E.2060103@rtr.ca> (raw)
In-Reply-To: <1238683047-13588-1-git-send-email-willy@linux.intel.com>
Matthew Wilcox wrote:
> From: Matthew Wilcox <matthew@wil.cx>
>
> SCSI and ATA both need to send data to the device. In order to do this,
> the BIO must be allocated with room for a page to be added, and the bio
> needs to be passed to the discard prep function. We also need to free
> the page attached to the BIO before we free it.
>
> init_request_from_bio() is not currently called from a context which
> forbids sleeping, and to make sure it stays that way (so we don't have
> to use GFP_ATOMIC), add a might_sleep() to it.
>
> Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
...
> @@ -1118,7 +1120,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
> req->cmd_flags |= REQ_DISCARD;
> if (bio_barrier(bio))
> req->cmd_flags |= REQ_SOFTBARRIER;
> - req->q->prepare_discard_fn(req->q, req);
> + req->q->prepare_discard_fn(req->q, req, bio);
> } else if (unlikely(bio_barrier(bio)))
> req->cmd_flags |= (REQ_HARDBARRIER | REQ_NOMERGE);
>
..
Matthew, note that prepare_discardfn() may fail,
and return an error result. The above code does not
check for this or handle it very well.
Cheers
prev parent reply other threads:[~2009-04-17 21:23 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-02 14:37 [PATCH 1/5] Block: Discard may need to allocate pages Matthew Wilcox
2009-04-02 14:37 ` [PATCH 2/5] Make DISCARD_BARRIER and DISCARD_NOBARRIER writes instead of reads Matthew Wilcox
2009-04-02 14:37 ` [PATCH 3/5] ata: Add TRIM infrastructure Matthew Wilcox
2009-04-02 14:37 ` [PATCH 4/5] ide: Add support for TRIM Matthew Wilcox
2009-04-02 14:37 ` [PATCH 5/5] libata: " Matthew Wilcox
2009-04-02 17:20 ` Mark Lord
2009-04-02 17:55 ` Matthew Wilcox
2009-04-16 20:25 ` Mark Lord
2009-04-17 19:44 ` Mark Lord
2009-04-02 15:58 ` [PATCH 4/5] ide: " Sergei Shtylyov
2009-04-02 16:28 ` Matthew Wilcox
2009-04-02 16:38 ` Sergei Shtylyov
2009-04-02 16:51 ` Matthew Wilcox
2009-04-02 19:37 ` Bartlomiej Zolnierkiewicz
2009-04-07 21:38 ` Bartlomiej Zolnierkiewicz
2009-04-07 22:15 ` Matthew Wilcox
2009-04-07 22:26 ` Jeff Garzik
2009-04-07 22:35 ` Bartlomiej Zolnierkiewicz
2009-04-07 17:20 ` Jeff Garzik
2009-04-07 17:57 ` Mark Lord
2009-04-07 18:10 ` Markus Trippelsdorf
2009-04-07 19:58 ` Mark Lord
2009-04-08 7:14 ` Markus Trippelsdorf
2009-04-08 14:25 ` Mark Lord
2009-04-08 14:33 ` Mark Lord
2009-04-08 14:44 ` Dongjun Shin
2009-04-08 14:59 ` Jeff Garzik
2009-04-08 15:50 ` Mark Lord
2009-04-02 15:55 ` [PATCH 3/5] ata: Add TRIM infrastructure Sergei Shtylyov
2009-04-02 16:18 ` Matthew Wilcox
2009-04-02 16:32 ` Sergei Shtylyov
2009-04-02 16:47 ` Matthew Wilcox
2009-04-07 0:02 ` Jeff Garzik
2009-04-05 12:28 ` [PATCH 1/5] Block: Discard may need to allocate pages Boaz Harrosh
2009-04-06 20:34 ` Matthew Wilcox
2009-05-03 6:11 ` Matthew Wilcox
2009-05-03 7:16 ` New TRIM/UNMAP tree published (2009-05-02) Matthew Wilcox
2009-05-03 13:07 ` Hugh Dickins
2009-05-03 14:48 ` Matthew Wilcox
2009-05-03 15:02 ` Boaz Harrosh
2009-05-03 15:42 ` Matthew Wilcox
2009-05-03 16:34 ` Boaz Harrosh
2009-05-03 18:34 ` Jeff Garzik
2009-05-03 18:40 ` Jeff Garzik
2009-05-03 19:04 ` James Bottomley
2009-05-03 19:20 ` Jeff Garzik
2009-05-03 19:37 ` James Bottomley
2009-05-04 14:03 ` Douglas Gilbert
2009-05-04 14:40 ` James Bottomley
2009-05-04 15:11 ` Douglas Gilbert
2009-05-04 15:23 ` James Bottomley
2009-05-03 19:47 ` James Bottomley
2009-05-03 22:47 ` Jeff Garzik
2009-05-04 15:28 ` Boaz Harrosh
2009-05-03 21:48 ` Matthew Wilcox
2009-05-03 22:54 ` Jeff Garzik
2009-05-03 18:48 ` Bartlomiej Zolnierkiewicz
2009-05-03 15:05 ` Hugh Dickins
2009-04-17 21:23 ` Mark Lord [this message]
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