Hi all,
I have a simple testing linear DM device:
dmsetup info
> Name: test
> State: ACTIVE
> Read Ahead: 256
> Tables present: LIVE
> Open count: 0
> Event number: 0
> Major, minor: 253, 0
> Number of targets: 1
# Let's create a partition:
parted -s /dev/dm-0 mkpart primary ext2 0 10M
# Create devmapping with kpartx:
kpartx -v -a -p _part /dev/dm-0
> add map test_part1 (253:1): 0 19531 linear /dev/dm-0 1
dmsetup info test_part1
> Name: test_part1
> State: ACTIVE
> Read Ahead: 256
> Tables present: LIVE
> Open count: 0
> Event number: 0
> Major, minor: 253, 1
> Number of targets: 1
> UUID: part1-dm-0
# Recreate the partition with different size:
parted -s /dev/dm-0 rm 1
parted -s /dev/dm-0 mkpart primary ext2 0 20M
# Try to recreate devmappings with kpartx:
kpartx -v -a -p _part /dev/dm-0
> device-mapper: resume ioctl failed: Invalid argument
> resume failed on test_part1
> add map test_part1 (253:1): 0 39062 linear /dev/dm-0 1
Note: the ioctl doesn't fail when kpartx is called multiple times without
changing the partition table on dm-0.
It happens with current multipath-tools from git. The bug is caused by
----
commit 44b1e84d7eb72a3c03cec486a227dc1beaa9ccd6
Author: Hannes Reinecke <hare@xxxxxxx>
AuthorDate: Mon Feb 9 13:59:57 2009 +0100
Commit: Christophe Varoqui <christophe.varoqui@xxxxxxx>
CommitDate: Wed Apr 22 01:44:53 2009 +0200
Use noflush for kpartx
kpartx has to use 'noflush' to be able to complete for an all-paths
down scenario. Otherwise no uevent might be sent and multipath
will stall.
----
The patch uses --noflush with DM_DEVICE_RESUME, but as far as I understand it,
--noflush makes sense only with DM_DEVICE_SUSPEND.
Perhaps kpartx should suspend the mapping before doing reload?
--
Best regards / s pozdravem
Petr Uzel, Packages maintainer
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