[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>
diff --git a/fs/ocfs2/file.h b/fs/ocfs2/file.h
index 066f14a..048ddca 100644
--- a/fs/ocfs2/file.h
+++ b/fs/ocfs2/file.h
@@ -32,6 +32,12 @@
extern const struct inode_operations ocfs2_special_file_iops;
struct ocfs2_alloc_context;
+struct ocfs2_file_private {
+ struct file *fp_file;
+ struct mutex fp_mutex;
+ struct ocfs2_lock_res fp_flock;
+};
+
enum ocfs2_alloc_restarted {
RESTART_NONE = 0,
RESTART_TRANS,