Stewart, Sean
a8e5a2d593
[SCSI] scsi_dh_alua: ALUA handler attach should succeed while TPG is transitioning
...
During testing, it was discovered that when a device tries to attach to the
alua handler while in TPG state of transitioning, the alua_rtpg function will
wait for it to exit the state before allowing it to continue. As a result, if
the 60 second timeout expires, the alua handler will not attach to the device.
To fix this, I have introduced an input argument to alua_rtpg called
wait_for_transition. The idea is that it will wait for the transition to
complete before an activation (because the current TPG state has some bearing
in that case), but during a discovery if it is transitioning, it will not
wait, and will store the state as standby for the time being.
I believe the precedent exists for this from commit
c0d289b3e59577532c45ee9110ef81bd7b341272 Since if the device reports a state
of transitioning, it can transition to other more valid states, and it has
been established TPGS is supported on the device, if it is attaching.
Signed-off-by: Sean Stewart <Sean.Stewart@netapp.com>
Acked-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2013-10-25 11:19:33 +01:00
..
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