From: Jeff Mahoney <jeffm@suse.com>
Date: Mon, 26 Jun 2006 07:27:23 +0000 (-0700)
Subject: [PATCH] dm: add DMF_FREEING
X-Git-Tag: v2.6.18-rc1~665
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fba9f90e568e17c326257ee293207b75880b39d6;p=pandora-kernel.git

[PATCH] dm: add DMF_FREEING

There is a chicken and egg problem between the block layer and dm in which the
gendisk associated with a mapping keeps a reference-less pointer to the
mapped_device.

This patch uses a new flag DMF_FREEING to indicate when the mapped_device is
no longer valid.  This is checked to prevent any attempt to open the device
from succeeding while the device is being destroyed.

[akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled]

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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