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[Linux-cluster] Re: GFS



Hi Mark,

Mark Fasheh writes:
This may sound naive, but so far OCFS2 has avoided the nead for deadlock
detection... I'd hate to have to add it now -- better to try avoiding them
in the first place.

Surely avoiding them is preferred but how do you do that when you have to mmap'd regions where userspace does memcpy()? The kernel won't much saying in it until ->nopage. We cannot grab all the required locks in proper order here because we don't know what size the buffer is. That's why I think lock sorting won't work of all the cases and thus the problem needs to be taken care of by the dlm.


Pekka


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