Bug 1418196

Summary: Changing bitmap location no longer emits change uevent
Product: [Fedora] Fedora Reporter: Vojtech Trefny <vtrefny>
Component: mdadmAssignee: XiaoNi <xni>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 26CC: agk, dledford, Jes.Sorensen, xni
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Last Closed: 2018-05-29 11:20:08 UTC Type: Bug
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Description Vojtech Trefny 2017-02-01 09:20:14 UTC
Description of problem:

Changing bitmap location for an mdraid no longer emits a change uevent on the md device. Change uevent occurs only for the member devices and only when changing the location to "internal" and not when changing it to "none".

On rawhide (mdadm - v4.0 - 2017-01-09):

sudo mdadm --grow /dev/md127 --bitmap internal

KERNEL[160059.548398] change   /devices/pci0000:00/0000:00:09.0/virtio4/block/vdb/vdb4 (block)
KERNEL[160059.550344] change   /devices/pci0000:00/0000:00:0b.0/virtio6/block/vdd/vdd1 (block)
UDEV  [160059.561255] change   /devices/pci0000:00/0000:00:0b.0/virtio6/block/vdd/vdd1 (block)
UDEV  [160059.564574] change   /devices/pci0000:00/0000:00:09.0/virtio4/block/vdb/vdb4 (block)

sudo mdadm --grow /dev/md127 --bitmap none


On Fedora 25 (mdadm - v3.4 - 28th January 2016):

sudo mdadm --grow /dev/md127 --bitmap internal

KERNEL[941014.804944] change   /devices/pci0000:00/0000:00:09.0/virtio4/block/vdb/vdb2 (block)
UDEV  [941014.813534] change   /devices/pci0000:00/0000:00:09.0/virtio4/block/vdb/vdb2 (block)
KERNEL[941014.818452] change   /devices/pci0000:00/0000:00:0e.0/virtio9/block/vdg/vdg1 (block)
UDEV  [941014.823177] change   /devices/pci0000:00/0000:00:0e.0/virtio9/block/vdg/vdg1 (block)
KERNEL[941015.994887] change   /devices/virtual/block/md127 (block)
UDEV  [941016.009080] change   /devices/virtual/block/md127 (block)

sudo mdadm --grow /dev/md127 --bitmap none

KERNEL[941087.396965] change   /devices/virtual/block/md127 (block)
UDEV  [941087.413503] change   /devices/virtual/block/md127 (block)

Comment 2 Vojtech Trefny 2017-02-02 07:17:25 UTC
Sorry, I forgot to mention why this is a problem. Storaged[1] (udisks2) uses uevents to update values of properties of block devices on DBus. If someone changes bitmap location using mdadm (or just any other tool than storaged itself) the change uevent is the only way we can know about it and update value of the property on DBus.

[1] http://storaged.org/

Comment 3 Fedora End Of Life 2017-02-28 11:09:04 UTC
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle.
Changing version to '26'.

Comment 4 Fedora End Of Life 2018-05-03 08:05:45 UTC
This message is a reminder that Fedora 26 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
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Comment 5 Fedora End Of Life 2018-05-29 11:20:08 UTC
Fedora 26 changed to end-of-life (EOL) status on 2018-05-29. Fedora 26
is no longer maintained, which means that it will not receive any
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