[Cluster-devel] [PATCH][GFS2] - bz 272021: GFS2 - flocks from same process trip kernel BUG at fs/gfs2/glock.c:1118!

[Abhijith Das]

This patch adds a new flag to the gfs2_holder structure GL_FLOCK. 
It is set on holders of glocks representing flocks. This flag is 
checked in add_to_queue() and a process is permitted to queue more 
than one holder onto a glock if it is set. This solves the issue 
of a process not being able to do multiple flocks on the same file. 
Through a single descriptor, a process can now promote and demote 
flocks. Through multiple descriptors a process can now queue 
multiple flocks on the same file. There's still the problem of 
a process deadlocking itself (because gfs2 blocking locks are not 
interruptible) by queueing incompatible deadlock.

Signed-off-by: Abhijith Das <adas at redhat.com>

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