This is a note to let you know that I've just added the patch titled
md: correctly handle probe of an 'mdp' device.
to the 2.6.37-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-correctly-handle-probe-of-an-mdp-device.patch
and it can be found in the queue-2.6.37 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 8f5f02c460b7ca74ce55ce126ce0c1e58a3f923d Mon Sep 17 00:00:00 2001
From: NeilBrown <[email protected]>
Date: Wed, 16 Feb 2011 13:58:51 +1100
Subject: md: correctly handle probe of an 'mdp' device.
From: NeilBrown <[email protected]>
commit 8f5f02c460b7ca74ce55ce126ce0c1e58a3f923d upstream.
'mdp' devices are md devices with preallocated device numbers
for partitions. As such it is possible to mknod and open a partition
before opening the whole device.
this causes md_probe() to be called with a device number of a
partition, which in-turn calls mddev_find with such a number.
However mddev_find expects the number of a 'whole device' and
does the wrong thing with partition numbers.
So add code to mddev_find to remove the 'partition' part of
a device number and just work with the 'whole device'.
This patch addresses https://bugzilla.kernel.org/show_bug.cgi?id=28652
Reported-by: [email protected]
Signed-off-by: NeilBrown <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/md/md.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -553,6 +553,9 @@ static mddev_t * mddev_find(dev_t unit)
{
mddev_t *mddev, *new = NULL;
+ if (unit && MAJOR(unit) != MD_MAJOR)
+ unit &= ~((1<<MdpMinorShift)-1);
+
retry:
spin_lock(&all_mddevs_lock);
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.37/fix-over-zealous-flush_disk-when-changing-device-size.patch
queue-2.6.37/md-correctly-handle-probe-of-an-mdp-device.patch
queue-2.6.37/md-avoid-spinlock-problem-in-blk_throtl_exit.patch
queue-2.6.37/md-fix-again-partition-detection-when-array-becomes-active.patch
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