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[DLM] cancel in conversion deadlock [4/6]

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When conversion deadlock is detected, cancel the conversion and return
EDEADLK to the application.  This is a new default behavior where before
the dlm would allow the deadlock to exist indefinately.

The DLM_LKF_NODLCKWT flag can now be used in a conversion to prevent the
dlm from performing conversion deadlock detection/cancelation on it.
The DLM_LKF_CONVDEADLK flag can continue to be used as before to tell the
dlm to demote the granted mode of the lock being converted if it gets into
a conversion deadlock.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
David Teigland
2007-05-18 09:01:26 -05:00
committed by Steven Whitehouse
parent d7db923ea4
commit c85d65e914
2 changed files with 138 additions and 63 deletions
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6
include/linux/dlm.h
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@@ -85,7 +85,11 @@
* Only relevant to locks originating in userspace. A persistent lock will not
* be removed if the process holding the lock exits.
*
* DLM_LKF_NODLKWT
* DLM_LKF_NODLCKWT
*
* Do not cancel the lock if it gets into conversion deadlock.
* Exclude this lock from being monitored due to DLM_LSFL_TIMEWARN.
*
* DLM_LKF_NODLCKBLK
*
* net yet implemented