[PATCH 1/2] ocfs2: add flock lock type

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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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This commit is contained in:

Mark Fasheh 2007-12-20 16:43:10 -08:00

parent 2fbe8d1ebe

commit cf8e06f1a8

5 changed files with 284 additions and 0 deletions

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267

fs/ocfs2/dlmglue.c

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5

fs/ocfs2/dlmglue.h

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6

fs/ocfs2/file.h

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1

fs/ocfs2/ocfs2.h

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5

fs/ocfs2/ocfs2_lockid.h

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