From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Nick Piggin <npiggin@suse.de>
Cc: Chris Mason <chris.mason@oracle.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
James Bottomley <James.Bottomley@suse.de>,
Matthew Wilcox <matthew@wil.cx>,
Christof Schmitt <christof.schmitt@de.ibm.com>,
Boaz Harrosh <bharrosh@panasas.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: Wrong DIF guard tag on ext2 write
Date: Thu, 03 Jun 2010 21:46:02 -0400 [thread overview]
Message-ID: <yq1y6evwox1.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <20100603162718.GR6822@laptop> (Nick Piggin's message of "Fri, 4 Jun 2010 02:27:18 +1000")
>>>>> "Nick" == Nick Piggin <npiggin@suse.de> writes:
Nick> Also I don't think we can deal with memory errors and scribbles
Nick> just by crcing dirty data. The calculations generating the data
Nick> could get corrupted.
Yep, the goal is to make the window as small as possible.
Nick> Data can be corrupted on its way back from the device to
Nick> userspace.
We also get a CRC back from the storage. So the (integrity-aware)
application is also able to check on read.
Nick> Obviously this feature is being pushed by databases and such that
Nick> really want to pass checksums all the way from userspace. Block
Nick> retrying is _not_ needed or wanted here of course.
Nope. The integrity error is bubbled all the way up to the database and
we can decide to retry, recreate or error out depending on what we find
when we do validation checks on the data buffer and the integrity
metadata.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2010-06-04 1:47 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-31 11:28 Christof Schmitt
2010-05-31 11:34 ` Christof Schmitt
2010-05-31 14:20 ` Martin K. Petersen
2010-05-31 14:46 ` Christof Schmitt
2010-06-01 13:16 ` Martin K. Petersen
2010-06-02 13:37 ` Christof Schmitt
2010-06-02 23:20 ` Dave Chinner
2010-06-04 1:34 ` Martin K. Petersen
2010-06-04 2:32 ` Dave Chinner
2010-06-07 16:20 ` Martin K. Petersen
2010-06-07 17:22 ` Boaz Harrosh
2010-06-07 17:40 ` Martin K. Petersen
2010-06-08 7:15 ` Christof Schmitt
2010-06-08 8:47 ` Dave Chinner
2010-06-08 8:52 ` Nick Piggin
2010-05-31 14:49 ` Nick Piggin
2010-06-01 13:17 ` Martin K. Petersen
2010-05-31 15:01 ` James Bottomley
2010-05-31 15:30 ` Boaz Harrosh
2010-05-31 15:49 ` Nick Piggin
2010-05-31 16:25 ` Boaz Harrosh
2010-06-01 13:22 ` Martin K. Petersen
2010-06-01 10:30 ` Christof Schmitt
2010-06-01 10:49 ` Boaz Harrosh
2010-06-01 13:03 ` Chris Mason
2010-06-01 13:50 ` Christof Schmitt
2010-06-01 13:58 ` Chris Mason
2010-06-08 7:18 ` Christof Schmitt
2010-06-01 14:26 ` Nick Piggin
2010-06-01 13:27 ` James Bottomley
2010-06-01 13:33 ` Chris Mason
2010-06-01 13:40 ` James Bottomley
2010-06-01 13:49 ` Chris Mason
2010-06-01 16:29 ` Matthew Wilcox
2010-06-01 16:47 ` Chris Mason
2010-06-01 16:54 ` James Bottomley
2010-06-01 18:09 ` Chris Mason
2010-06-01 18:46 ` Nick Piggin
2010-06-01 19:35 ` Chris Mason
2010-06-02 3:20 ` Nick Piggin
2010-06-02 13:17 ` Martin K. Petersen
2010-06-02 13:41 ` Nick Piggin
2010-06-03 15:46 ` Chris Mason
2010-06-03 16:27 ` Nick Piggin
2010-06-04 1:46 ` Martin K. Petersen [this message]
2010-06-04 3:09 ` Nick Piggin
2010-06-04 2:02 ` Dave Chinner
2010-06-04 15:32 ` Jan Kara
2010-06-04 1:30 ` Martin K. Petersen
2010-06-01 21:07 ` James Bottomley
2010-06-01 22:49 ` Chris Mason
2010-06-01 13:50 ` Martin K. Petersen
2010-06-01 14:28 ` Nick Piggin
2010-06-01 14:32 ` James Bottomley
2010-06-01 14:54 ` Martin K. Petersen
2010-06-03 11:20 ` Vladislav Bolkhovitin
2010-06-03 12:07 ` Boaz Harrosh
2010-06-03 12:41 ` Vladislav Bolkhovitin
2010-06-03 12:46 ` Vladislav Bolkhovitin
2010-06-09 15:58 ` Vladislav Bolkhovitin
2010-06-03 13:06 ` Boaz Harrosh
2010-06-03 13:23 ` Vladislav Bolkhovitin
2010-07-23 17:59 ` Gennadiy Nerubayev
2010-07-23 19:16 ` Vladislav Bolkhovitin
2010-07-23 20:51 ` Gennadiy Nerubayev
2010-07-26 12:22 ` Vladislav Bolkhovitin
2010-07-26 17:00 ` Gennadiy Nerubayev
2010-07-26 19:26 ` Vladislav Bolkhovitin
2010-07-24 1:03 ` Dave Chinner
2010-06-01 2:40 ` FUJITA Tomonori
2010-06-03 16:09 ` [LFS/VM TOPIC] Stable pages while IO (was Wrong DIF guard tag on ext2 write) Boaz Harrosh
2010-06-03 16:30 ` [Lsf10-pc] " J. Bruce Fields
2010-06-03 17:41 ` Vladislav Bolkhovitin
2010-06-04 16:23 ` Jan Kara
2010-06-04 16:30 ` [Lsf10-pc] " J. Bruce Fields
2010-06-04 17:11 ` Jan Kara
2010-06-06 9:35 ` Boaz Harrosh
2010-06-06 23:37 ` Jan Kara
2010-06-07 8:30 ` Boaz Harrosh
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