Change in vdsm[master]: Add synchronous mode for udevTrigger

[Xu He Jie]

Xu He Jie has uploaded a new change for review.

Change subject: Add synchronous mode for udevTrigger
......................................................................

Add synchronous mode for udevTrigger

udevadm trigger was asynchronous. Execute udevadm settle after
udevadm trigger, then it can works as synchronous.

Change-Id: I731c3ef6fe945c7c0278d638bf4cc8164345fd01
Signed-off-by: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
---
M vdsm/storage/hsm.py
M vdsm/supervdsmServer.py
2 files changed, 6 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.ovirt.org:29418/vdsm refs/changes/16/6916/1
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I731c3ef6fe945c7c0278d638bf4cc8164345fd01
Gerrit-PatchSet: 1
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;

Royce Lv has posted comments on this change.

Change subject: Add synchronous mode for udevTrigger
......................................................................


Patch Set 3: Looks good to me, but someone else must approve

I test access permission after trigger event, there is some occasion the dev
permission's not right, so I believe the trigger action should be synchronized.

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Gerrit-MessageType: comment
Gerrit-Change-Id: I731c3ef6fe945c7c0278d638bf4cc8164345fd01
Gerrit-PatchSet: 3
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Dan Kenigsberg <danken(a)redhat.com&gt;
Gerrit-Reviewer: Eduardo <ewarszaw(a)redhat.com&gt;
Gerrit-Reviewer: Mark Wu <wudxw(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Royce Lv <lvroyce(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: oVirt Jenkins CI Server

[Jenkins CI RO]

oVirt Jenkins CI Server has posted comments on this change.

Change subject: Add synchronous mode for udevTrigger
......................................................................


Patch Set 3:

Build Successful 

http://jenkins.ovirt.info/job/vdsm_unit_tests_by_patch/247/ : SUCCESS

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Gerrit-Change-Id: I731c3ef6fe945c7c0278d638bf4cc8164345fd01
Gerrit-PatchSet: 3
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Dan Kenigsberg <danken(a)redhat.com&gt;
Gerrit-Reviewer: Eduardo <ewarszaw(a)redhat.com&gt;
Gerrit-Reviewer: Mark Wu <wudxw(a)linux.vnet.ibm.com&gt;
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Gerrit-Reviewer: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
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[Jenkins CI RO]

oVirt Jenkins CI Server has posted comments on this change.

Change subject: Add synchronous mode for udevTrigger
......................................................................


Patch Set 3: No score

Build Started http://jenkins.ovirt.info/job/vdsm_unit_tests_by_patch/247/

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Gerrit-Change-Id: I731c3ef6fe945c7c0278d638bf4cc8164345fd01
Gerrit-PatchSet: 3
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Dan Kenigsberg <danken(a)redhat.com&gt;
Gerrit-Reviewer: Eduardo <ewarszaw(a)redhat.com&gt;
Gerrit-Reviewer: Mark Wu <wudxw(a)linux.vnet.ibm.com&gt;
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Gerrit-Reviewer: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
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[Xu He Jie]

Xu He Jie has posted comments on this change.

Change subject: Add synchronous mode for udevTrigger
......................................................................


Patch Set 3:

patchset2: add check for return code of 'udevadm settle'
patchset3: update comment message and error message.

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Gerrit-Change-Id: I731c3ef6fe945c7c0278d638bf4cc8164345fd01
Gerrit-PatchSet: 3
Gerrit-Project: vdsm
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Gerrit-Owner: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Dan Kenigsberg <danken(a)redhat.com&gt;
Gerrit-Reviewer: Eduardo <ewarszaw(a)redhat.com&gt;
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Gerrit-Reviewer: Royce Lv <lvroyce(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;

[Xu He Jie]

Xu He Jie has posted comments on this change.

Change subject: Add synchronous mode for udevTrigger
......................................................................


Patch Set 1: I would prefer that you didn't submit this

(2 inline comments)

Even just few event, it still have a potential race problem. It also depend on how long
will the rules take. 

this patch resolve different race problem with http://gerrit.ovirt.org/#/c/6780/.
http://gerrit.ovirt.org/#/c/6780/ can fix Bug #844130. This patch try to fix another
potential race problem. But I think we should fix it.

....................................................
File vdsm/supervdsmServer.py
Line 208:             raise OSError(errno.EINVAL, "Could not trigger change for
device \
This should be return to caller

Line 213:             storage.misc.execCmd(cmd, sudo=False)
I should check this return value, if timeout report to caller

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Gerrit-MessageType: comment
Gerrit-Change-Id: I731c3ef6fe945c7c0278d638bf4cc8164345fd01
Gerrit-PatchSet: 1
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Dan Kenigsberg <danken(a)redhat.com&gt;
Gerrit-Reviewer: Eduardo <ewarszaw(a)redhat.com&gt;
Gerrit-Reviewer: Mark Wu <wudxw(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Royce Lv <lvroyce(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;

Mark Wu has posted comments on this change.

Change subject: Add synchronous mode for udevTrigger
......................................................................


Patch Set 1:

What's the purpose of this patch? The option '--property-match' can filter the
event to be generated. So even it's asynchronous, it should not be a problem. 

Please note the problem in http://gerrit.ovirt.org/#/c/6780/ is caused by the race between
loading rule and triggering event, not triggering event and running qemu. Please fix me if
I am wrong.

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Gerrit-Change-Id: I731c3ef6fe945c7c0278d638bf4cc8164345fd01
Gerrit-PatchSet: 1
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Dan Kenigsberg <danken(a)redhat.com&gt;
Gerrit-Reviewer: Eduardo <ewarszaw(a)redhat.com&gt;
Gerrit-Reviewer: Mark Wu <wudxw(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Royce Lv <lvroyce(a)linux.vnet.ibm.com&gt;

[Xu He Jie]

Xu He Jie has abandoned this change.

Change subject: Add synchronous mode for udevTrigger
......................................................................


Patch Set 3: Abandoned

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Gerrit-Change-Id: I731c3ef6fe945c7c0278d638bf4cc8164345fd01
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Gerrit-Owner: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Dan Kenigsberg <danken(a)redhat.com&gt;
Gerrit-Reviewer: Eduardo <ewarszaw(a)redhat.com&gt;
Gerrit-Reviewer: Royce Lv <lvroyce(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: Xu He Jie <xuhj(a)linux.vnet.ibm.com&gt;
Gerrit-Reviewer: oVirt Jenkins CI Server