From: Mark Lord <kernel@teksavvy.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: jens.axboe@oracle.com, james.bottomley@hansenpartnership.com,
hch@infradead.org, willy@wil.cx, jgarzik@pobox.com,
sandeen@redhat.com, rwheeler@redhat.com,
linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: [PATCH 4/5] libata: Report zeroed read after Trim and max discard size
Date: Thu, 26 Nov 2009 20:55:18 -0500 [thread overview]
Message-ID: <4B0F3186.6000903@teksavvy.com> (raw)
In-Reply-To: <1259254843-8326-5-git-send-email-martin.petersen@oracle.com>
Martin K. Petersen wrote:
..
> If a storage device supports Trim and the DRAT and RZAT bits are set,
> report TPRZ=1 in Read Capacity(16).
..
> +static inline int ata_id_has_zero_after_trim(const u16 *id)
> +{
> + /* DSM supported, deterministic read, and read zero after trim set */
> + if (ata_id_has_trim(id) && id[ATA_ID_ADDITIONAL_SUPP] & 0x4020)
> + return 1;
..
Is that correct, or should it be this:
if (ata_id_has_trim(id) && (id[ATA_ID_ADDITIONAL_SUPP] & 0x4020) == 0x4020)
??
next prev parent reply other threads:[~2009-11-27 1:55 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-26 17:00 Thin provisioning fixes (take 3) Martin K. Petersen
2009-11-26 17:00 ` [PATCH 1/5] block: Allow devices to indicate whether discarded blocks are zeroed Martin K. Petersen
2009-11-26 17:00 ` [PATCH 2/5] sd: WRITE SAME(16) / UNMAP support Martin K. Petersen
2009-11-26 17:00 ` [PATCH 3/5] scsi: Correctly handle thin provisioning write error Martin K. Petersen
2009-11-26 17:00 ` [PATCH 4/5] libata: Report zeroed read after Trim and max discard size Martin K. Petersen
2009-11-27 1:55 ` Mark Lord [this message]
2009-11-27 3:46 ` Martin K. Petersen
2009-12-03 7:57 ` Jeff Garzik
2009-12-03 23:02 ` Jeff Garzik
2009-11-26 17:00 ` [PATCH 5/5] libata: Clarify ata_set_lba_range_entries function Martin K. Petersen
2009-12-03 23:02 ` Jeff Garzik
2009-11-26 17:09 ` Thin provisioning fixes (take 3) James Bottomley
2009-11-26 17:27 ` Martin K. Petersen
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