From: Sagi Grimberg <sagig@dev.mellanox.co.il>
To: "Martin K. Petersen" <martin.petersen@oracle.com>,
Sagi Grimberg <sagig@mellanox.com>
Cc: "Nicholas A. Bellinger" <nab@daterainc.com>,
target-devel <target-devel@vger.kernel.org>,
linux-scsi <linux-scsi@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>, Hannes Reinecke <hare@suse.de>,
Or Gerlitz <ogerlitz@mellanox.com>,
Nicholas Bellinger <nab@linux-iscsi.org>
Subject: Re: [PATCH 07/14] target/sbc: Add P_TYPE + PROT_EN bits to READ_CAPACITY_16
Date: Sun, 12 Jan 2014 14:13:47 +0200 [thread overview]
Message-ID: <52D286FB.2070108@dev.mellanox.co.il> (raw)
In-Reply-To: <yq1mwj3r2py.fsf@sermon.lab.mkp.net>
On 1/10/2014 10:39 PM, Martin K. Petersen wrote:
>>>>>> "Sagi" == Sagi Grimberg <sagig@mellanox.com> writes:
> Sagi> What about FORMAT_UNIT emulation? The backstore protection
> Sagi> configuration is done at the target side via configfs/targetcli,
>
> I don't know of any non-disk devices that actually implement FORMAT
> UNIT. Usually such configuration is done using the array management
> interface.
>
Hmm,
So this takes me to a corner I still don't understand, if a LUN is
pre-formatted as T10-protected, what happens to unwritten blocks read?
I mean, SCSI login executes some reads from several LBAs which will
probably fail as blocks are unwritten.
What is the usage model? perform Initiator login and then format the LUN
on the target node? This is why I thought FORMAT_UNIT should be implemented.
I understand this corner will disappear in DIF v2 (following DIX1.1
draft) with ESCAPE flags.
next prev parent reply other threads:[~2014-01-12 12:13 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-08 20:15 [PATCH 00/14] target: Initial support for DIF Type1+Type3 emulation Nicholas A. Bellinger
2014-01-08 20:15 ` [PATCH 01/14] target: Add DIF related base definitions Nicholas A. Bellinger
2014-01-09 10:58 ` Sagi Grimberg
2014-01-08 20:15 ` [PATCH 02/14] target: Add DIF CHECK_CONDITION ASC/ASCQ exception cases Nicholas A. Bellinger
2014-01-09 10:43 ` Sagi Grimberg
2014-01-10 6:53 ` Nicholas A. Bellinger
2014-01-14 7:44 ` Sagi Grimberg
2014-01-14 8:53 ` Nicholas A. Bellinger
2014-01-14 10:56 ` Sagi Grimberg
2014-01-08 20:15 ` [PATCH 03/14] target/sbc: Add sbc_check_prot + update sbc_parse_cdb for DIF Nicholas A. Bellinger
2014-01-09 14:58 ` Sagi Grimberg
2014-01-10 7:04 ` Nicholas A. Bellinger
2014-01-12 11:59 ` Sagi Grimberg
2014-01-13 19:23 ` Nicholas A. Bellinger
2014-01-10 20:30 ` Martin K. Petersen
2014-01-08 20:15 ` [PATCH 04/14] target/sbc: Add DIF TYPE1+TYPE3 read/write verify emulation Nicholas A. Bellinger
2014-01-08 20:15 ` [PATCH 05/14] target/spc: Add protection bit to standard INQUIRY output Nicholas A. Bellinger
2014-01-10 20:34 ` Martin K. Petersen
2014-01-08 20:15 ` [PATCH 06/14] target/spc: Add protection related bits to INQUIRY EVPD=0x86 Nicholas A. Bellinger
2014-01-10 20:35 ` Martin K. Petersen
2014-01-08 20:15 ` [PATCH 07/14] target/sbc: Add P_TYPE + PROT_EN bits to READ_CAPACITY_16 Nicholas A. Bellinger
2014-01-09 10:24 ` Sagi Grimberg
2014-01-10 6:21 ` Nicholas A. Bellinger
2014-01-10 19:50 ` Andy Grover
2014-01-10 20:15 ` Nicholas A. Bellinger
2014-01-10 20:46 ` Martin K. Petersen
2014-01-12 11:49 ` Sagi Grimberg
2014-01-10 20:40 ` Martin K. Petersen
2014-01-10 20:39 ` Martin K. Petersen
2014-01-12 12:13 ` Sagi Grimberg
2014-01-12 12:33 ` Martin K. Petersen
2014-01-12 12:47 ` Sagi Grimberg
2014-01-12 12:53 ` Martin K. Petersen
2014-01-12 16:37 ` Douglas Gilbert
2014-01-12 17:21 ` Martin K. Petersen
2014-01-12 18:53 ` Douglas Gilbert
2014-01-13 16:33 ` Sagi Grimberg
2014-01-12 12:13 ` Sagi Grimberg [this message]
2014-01-10 20:37 ` Martin K. Petersen
2014-01-08 20:15 ` [PATCH 08/14] target/spc: Expose ATO bit in control mode page Nicholas A. Bellinger
2014-01-10 20:57 ` Martin K. Petersen
2014-01-08 20:15 ` [PATCH 09/14] target/configfs: Expose protection device attributes Nicholas A. Bellinger
2014-01-09 11:01 ` Sagi Grimberg
2014-01-10 7:00 ` Nicholas A. Bellinger
2014-01-12 11:56 ` Sagi Grimberg
2014-01-10 21:01 ` Martin K. Petersen
2014-01-12 12:18 ` Sagi Grimberg
2014-01-12 12:43 ` Martin K. Petersen
2014-01-12 12:52 ` Sagi Grimberg
2014-01-13 18:30 ` Nicholas A. Bellinger
2014-01-13 18:52 ` James Bottomley
2014-01-13 19:27 ` Nicholas A. Bellinger
2014-01-13 19:43 ` James Bottomley
2014-01-13 20:19 ` Martin K. Petersen
2014-01-13 20:24 ` James Bottomley
2014-01-13 20:30 ` Martin K. Petersen
2014-01-08 20:15 ` [PATCH 10/14] target: Add protection SGLs to target_submit_cmd_map_sgls Nicholas A. Bellinger
2014-01-08 20:15 ` [PATCH 11/14] target/rd: Refactor rd_build_device_space + rd_release_device_space Nicholas A. Bellinger
2014-01-08 20:15 ` [PATCH 12/14] target/rd: Add support for protection SGL setup + release Nicholas A. Bellinger
2014-01-08 20:15 ` [PATCH 13/14] target/rd: Add DIF protection into rd_execute_rw Nicholas A. Bellinger
2014-01-09 10:32 ` Sagi Grimberg
2014-01-10 6:52 ` Nicholas A. Bellinger
2014-01-12 11:53 ` Sagi Grimberg
2014-01-13 19:22 ` Nicholas A. Bellinger
2014-01-10 21:06 ` Martin K. Petersen
2014-01-12 12:23 ` Sagi Grimberg
2014-01-08 20:15 ` [PATCH 14/14] tcm_loop: Enable DIF/DIX modes in SCSI host LLD Nicholas A. Bellinger
2014-01-10 21:09 ` Martin K. Petersen
2014-01-13 18:45 ` Nicholas A. Bellinger
2014-01-13 20:08 ` Martin K. Petersen
2014-01-10 2:00 ` [PATCH 00/14] target: Initial support for DIF Type1+Type3 emulation Martin K. Petersen
2014-01-10 5:57 ` Nicholas A. Bellinger
2014-01-15 18:03 ` sagi grimberg
2014-01-15 21:55 ` Nicholas A. Bellinger
2014-01-16 1:42 ` Martin K. Petersen
2014-01-16 2:32 ` Nicholas A. Bellinger
2014-01-16 3:04 ` Martin K. Petersen
2014-01-16 7:45 ` sagi grimberg
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=52D286FB.2070108@dev.mellanox.co.il \
--to=sagig@dev.mellanox.co.il \
--cc=hare@suse.de \
--cc=hch@lst.de \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=martin.petersen@oracle.com \
--cc=nab@daterainc.com \
--cc=nab@linux-iscsi.org \
--cc=ogerlitz@mellanox.com \
--cc=sagig@mellanox.com \
--cc=target-devel@vger.kernel.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).