From: Jeff Garzik <jeff@garzik.org>
To: Matthew Wilcox <matthew@wil.cx>, Jens Axboe <jens.axboe@oracle.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>,
Hugh Dickins <hugh@veritas.com>,
Matthew Wilcox <willy@linux.intel.com>,
linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-scsi@vger.kernel.org,
Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
Mark Lord <lkml@rtr.ca>
Subject: Re: New TRIM/UNMAP tree published (2009-05-02)
Date: Sun, 03 May 2009 14:40:10 -0400 [thread overview]
Message-ID: <49FDE50A.4060503@garzik.org> (raw)
In-Reply-To: <49FDE3BB.505@garzik.org>
Jeff Garzik wrote:
> (2) determine at init if queue (a) supports explicit DISCARD and/or (b)
> supports DISCARD flag passed with READ or WRITE
As an aside -- does any existing command set support case #b, above?
AFAICT, ATA, SCSI and NVMHCI all have a single, explicit hardware
command to discard/deallocate unused sectors.
Therefore, creating REQ_TYPE_DISCARD seems to eliminate any need for new
hook ->prepare_discard().
This provides a 1:1 correspondence between hardware and struct request,
most closely matching the setup of known hardware.
Jeff
next prev parent reply other threads:[~2009-05-03 18:40 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 [this message]
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 ` [PATCH 1/5] Block: Discard may need to allocate pages Mark Lord
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=49FDE50A.4060503@garzik.org \
--to=jeff@garzik.org \
--cc=bharrosh@panasas.com \
--cc=bzolnier@gmail.com \
--cc=hugh@veritas.com \
--cc=jens.axboe@oracle.com \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=lkml@rtr.ca \
--cc=matthew@wil.cx \
--cc=willy@linux.intel.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.