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authorSunil Mushran <sunil.mushran@oracle.com>2010-01-21 13:50:03 -0500
committerJoel Becker <joel.becker@oracle.com>2010-02-03 02:51:13 -0500
commita19128260107f951d1b4c421cf98b92f8092b069 (patch)
tree0e98386142589c986fe433e1dd390f4a21db7bc9 /fs/ocfs2/aops.c
parent0b94a909eb2e2f6990d05fd486a0cb4902ef1ae7 (diff)
ocfs2: Prevent a livelock in dlmglue
There is possibility of a livelock in __ocfs2_cluster_lock(). If a node were to get an ast for an upconvert request, followed immediately by a bast, there is a small window where the fs may downconvert the lock before the process requesting the upconvert is able to take the lock. This patch adds a new flag to indicate that the upconvert is still in progress and that the dc thread should not downconvert it right now. Wengang Wang <wen.gang.wang@oracle.com> and Joel Becker <joel.becker@oracle.com> contributed heavily to this patch. Reported-by: David Teigland <teigland@redhat.com> Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs/ocfs2/aops.c')
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