From: Christoph Hellwig <hch@lst.de>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Christoph Hellwig <hch@lst.de>, Tejun Heo <tj@kernel.org>,
martin.petersen@oracle.com, axboe@kernel.dk,
linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-block@vger.kernel.org
Subject: Re: support ranges TRIM for libata
Date: Thu, 23 Mar 2017 15:43:30 +0100 [thread overview]
Message-ID: <20170323144330.GA31447@lst.de> (raw)
In-Reply-To: <1490279706.2202.17.camel@HansenPartnership.com>
On Thu, Mar 23, 2017 at 10:35:06AM -0400, James Bottomley wrote:
> I'm certainly not saying we blindly follow t10, but I believe their
> intent is to issue the next command from the completion of the first
> (we can do this using qc->complete_fn, like atapi_request_sense). That
> way we don't get any tag problems because there's only one command
> outstanding at once; reusing the qc means no allocation issues either.
>
> The t10 approach does mean the SG_IO problem is actually fixable rather
> than simply erroring out.
It would be sort of fixable, but with a lot of hackery.
> That's up to you ... from the point of view of code documenting itself,
> forming the ATA_16 TRIM in sd and not doing any satl transformation is
> easier for others to follow, but if it's going to cause more code, I'm
> only marginal on the advantages of easier to follow code.
I tried this earlier before giving up on it because it looked to ugly.
But I can complete that version of it and post it for people to compare.
next prev parent reply other threads:[~2017-03-23 14:43 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-20 20:43 support ranges TRIM for libata Christoph Hellwig
2017-03-20 20:43 ` [PATCH 1/7] ѕd: split sd_setup_discard_cmnd Christoph Hellwig
2017-03-27 22:24 ` Bart Van Assche
2017-03-28 14:05 ` axboe
2017-03-30 8:49 ` hch
2017-03-20 20:43 ` [PATCH 2/7] sd: provide a new ata trim provisioning mode Christoph Hellwig
2017-03-27 22:40 ` Bart Van Assche
2017-03-20 20:43 ` [PATCH 3/7] libata: remove SCT WRITE SAME support Christoph Hellwig
2017-03-20 20:43 ` [PATCH 4/7] libata: simplify the trim implementation Christoph Hellwig
2017-03-20 20:43 ` [PATCH 5/7] block: add a max_discard_segment_size queue limit Christoph Hellwig
2017-03-27 23:09 ` Bart Van Assche
2017-03-20 20:43 ` [PATCH 6/7] sd: support multi-range TRIM for ATA disks Christoph Hellwig
2017-03-27 23:38 ` Bart Van Assche
2017-03-20 20:43 ` [PATCH 7/7] sd: use ZERO_PAGE for WRITE_SAME payloads Christoph Hellwig
2017-03-27 23:40 ` Bart Van Assche
2017-03-21 18:59 ` support ranges TRIM for libata Tejun Heo
2017-03-22 18:19 ` Christoph Hellwig
2017-03-23 13:47 ` James Bottomley
2017-03-23 13:55 ` Christoph Hellwig
2017-03-23 14:35 ` James Bottomley
2017-03-23 14:43 ` Christoph Hellwig [this message]
2017-03-23 15:04 ` Tejun Heo
2017-03-23 15:27 ` Christoph Hellwig
2017-03-23 15:30 ` Christoph Hellwig
2017-03-23 15:39 ` Martin K. Petersen
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