From: Dan Williams <dan.j.williams@intel.com>
To: neilb@suse.de
Cc: linux-raid@vger.kernel.org
Subject: [RFC PATCH 0/2] a couple of readonly handling fixups
Date: Thu, 08 Jan 2009 00:24:33 -0700 [thread overview]
Message-ID: <20090108072023.9577.3585.stgit@dwillia2-linux.ch.intel.com> (raw)
The BUG_ON(mddev->ro == 1) in md_write_start can be triggered under two
circumstances in recent kernels. One was reported by Justin Maggard:
1) Create an md array with >= 1 disk
2) Start a task writing to the array ("dd if=/dev/zero of=/dev/md0
bs=1M count=10000 &" does the trick for me)
3) Force an improper reboot with reboot -fn
...the other was discovered while investigating this issue.
1) Set a raid5 readyonly with mdadm
2) Set the array writable with blockdev
3) Attempt to write to the array
---
Dan Williams (2):
Revert "Restore force switch of md array to readonly at reboot time."
md: set mddev readonly flag on blkdev BLKROSET ioctl
drivers/md/md.c | 35 ++++++++++++++++++++++++++++++-----
1 files changed, 30 insertions(+), 5 deletions(-)
next reply other threads:[~2009-01-08 7:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-08 7:24 Dan Williams [this message]
2009-01-08 7:24 ` [PATCH 1/2] md: set mddev readonly flag on blkdev BLKROSET ioctl Dan Williams
2009-01-08 7:24 ` [PATCH 2/2] Revert "Restore force switch of md array to readonly at reboot time." Dan Williams
2009-01-18 23:07 ` [RFC PATCH 0/2] a couple of readonly handling fixups Neil Brown
2010-05-11 18:06 ` Dan Williams
2010-05-11 22:33 ` Neil Brown
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