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dmsetup arguments

To: xfs@xxxxxxxxxxx
Subject: dmsetup arguments
From: alexander.tsvetkov@xxxxxxxxxx
Date: Fri, 14 Jun 2013 12:51:25 +0400
Delivered-to: xfs@xxxxxxxxxxx
Organization: Oracle Corporation
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XFStests suite generic/311 test fails on command: "sbin/dmsetup load flakey-test --table "0 150000001 flakey /dev/sdc2 0 0 180 1 drop_writes" with error: "device-mapper: reload ioctl on flakey-test failed: Invalid argument", so as I understand the command format provided to ioctl is incorrect here. Kernel logs has message:

"Jun 13 16:47:15 tests kernel: device-mapper: table: 252:3: flakey: dm-flakey: Invalid argument count
Jun 13 16:47:15 tests kernel: device-mapper: ioctl: error adding target to table"

Looking into the source code of package LVM2.02.98 which devmapper library belongs to I find argument "drop_writes" used in the command only in documentation doc/kernel/flakey.txt:

"Optional feature parameters:
  If no feature parameters are present, during the periods of
  unreliability, all I/O returns errors.

        All write I/O is silently ignored.
        Read I/O is handled correctly."

This argument feature was added in the patch from "27 Jun 2011":

"[dm-devel] [PATCH 0/9] dm flakey: add features
  • From: Mike Snitzer <snitzer redhat com>
  • To: <dm-devel redhat com>
  • Cc: Mike Snitzer <snitzer redhat com>
  • Subject: [dm-devel] [PATCH 0/9] dm flakey: add features
  • Date: Mon, 27 Jun 2011 15:53:34 -0400

Add "drop_writes", "corrupt_bio_byte" and "debug" features to the
flakey target."

but was patch modifications included in library of LVM2.02.98 package? Or may be it was already removed from it after?

Alexander Tsvetkov

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