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authorMark Fasheh <mark.fasheh@oracle.com>2007-12-20 16:43:10 -0800
committerMark Fasheh <mark.fasheh@oracle.com>2008-01-25 15:05:43 -0800
commitcf8e06f1a860d8680d6bb4ac8ec7d7724988e46f (patch)
tree4705326641f39fdb1b97c925b55dae3c4634d5e0 /fs/ocfs2/Makefile
parent2fbe8d1ebe004425b4f7b8bba345623d2280be82 (diff)
[PATCH 1/2] ocfs2: add flock lock type
This adds a new dlmglue lock type which is intended to back flock() requests. Since these locks are driven from userspace, usage rules are much more liberal than the typical Ocfs2 internal cluster lock. As a result, we can't make use of most dlmglue features - lock caching and lock level optimizations in particular. Additionally, userspace is free to deadlock itself, so we have to deal with that in the same way as the rest of the kernel - by allowing a signal to abort a lock request. In order to keep ocfs2_cluster_lock() complexity down, ocfs2_file_lock() does it's own dlm coordination. We still use the same helper functions though, so duplicated code is kept to a minimum. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
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