[Cluster-devel] Patch: making DLM more robust

[Menyhart Zoltan <Zoltan.Menyhart@bull.net>]

Hi,

An easy first step to make DLM more robust can be adding a time out protection
to the lock space cration operation, while waiting for a "dlm_controld" action.
A new memeber "ci_dlm_controld_secs" is added to "dlm_config" to set up time out
in seconds, DEFAULT_DLM_CTRL_SECS is 5 seconds.

At the same time, signals can be enabled and handled, too.

DLM_USER_CREATE_LOCKSPACE will be able to return new error codes:
-EINTR or -ETIMEDOUT.

Could you please tell me why the signals are blocked within "device_write()"?
I think it is safe to allow signals, surely in your original code sequences
waiting in an uninterruptible way.

BTW "sigprocmask()" already contains "recalc_sigpending()".

  out_sig:
     sigprocmask(SIG_SETMASK, &tmpsig, NULL);
     recalc_sigpending();


Thanks,

Zoltan Menyhart
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