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-rw-r--r--include/linux/dlm.h71
1 files changed, 66 insertions, 5 deletions
diff --git a/include/linux/dlm.h b/include/linux/dlm.h
index d4e02f5353a0..6c7f6e9546c7 100644
--- a/include/linux/dlm.h
+++ b/include/linux/dlm.h
@@ -2,7 +2,7 @@
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
-** Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
+** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
@@ -74,15 +74,76 @@ struct dlm_lksb {
#ifdef __KERNEL__
+struct dlm_slot {
+ int nodeid; /* 1 to MAX_INT */
+ int slot; /* 1 to MAX_INT */
+};
+
+/*
+ * recover_prep: called before the dlm begins lock recovery.
+ * Notfies lockspace user that locks from failed members will be granted.
+ * recover_slot: called after recover_prep and before recover_done.
+ * Identifies a failed lockspace member.
+ * recover_done: called after the dlm completes lock recovery.
+ * Identifies lockspace members and lockspace generation number.
+ */
+
+struct dlm_lockspace_ops {
+ void (*recover_prep) (void *ops_arg);
+ void (*recover_slot) (void *ops_arg, struct dlm_slot *slot);
+ void (*recover_done) (void *ops_arg, struct dlm_slot *slots,
+ int num_slots, int our_slot, uint32_t generation);
+};
+
/*
* dlm_new_lockspace
*
- * Starts a lockspace with the given name. If the named lockspace exists in
- * the cluster, the calling node joins it.
+ * Create/join a lockspace.
+ *
+ * name: lockspace name, null terminated, up to DLM_LOCKSPACE_LEN (not
+ * including terminating null).
+ *
+ * cluster: cluster name, null terminated, up to DLM_LOCKSPACE_LEN (not
+ * including terminating null). Optional. When cluster is null, it
+ * is not used. When set, dlm_new_lockspace() returns -EBADR if cluster
+ * is not equal to the dlm cluster name.
+ *
+ * flags:
+ * DLM_LSFL_NODIR
+ * The dlm should not use a resource directory, but statically assign
+ * resource mastery to nodes based on the name hash that is otherwise
+ * used to select the directory node. Must be the same on all nodes.
+ * DLM_LSFL_TIMEWARN
+ * The dlm should emit netlink messages if locks have been waiting
+ * for a configurable amount of time. (Unused.)
+ * DLM_LSFL_FS
+ * The lockspace user is in the kernel (i.e. filesystem). Enables
+ * direct bast/cast callbacks.
+ * DLM_LSFL_NEWEXCL
+ * dlm_new_lockspace() should return -EEXIST if the lockspace exists.
+ *
+ * lvblen: length of lvb in bytes. Must be multiple of 8.
+ * dlm_new_lockspace() returns an error if this does not match
+ * what other nodes are using.
+ *
+ * ops: callbacks that indicate lockspace recovery points so the
+ * caller can coordinate its recovery and know lockspace members.
+ * This is only used by the initial dlm_new_lockspace() call.
+ * Optional.
+ *
+ * ops_arg: arg for ops callbacks.
+ *
+ * ops_result: tells caller if the ops callbacks (if provided) will
+ * be used or not. 0: will be used, -EXXX will not be used.
+ * -EOPNOTSUPP: the dlm does not have recovery_callbacks enabled.
+ *
+ * lockspace: handle for dlm functions
*/
-int dlm_new_lockspace(const char *name, int namelen,
- dlm_lockspace_t **lockspace, uint32_t flags, int lvblen);
+int dlm_new_lockspace(const char *name, const char *cluster,
+ uint32_t flags, int lvblen,
+ const struct dlm_lockspace_ops *ops, void *ops_arg,
+ int *ops_result, dlm_lockspace_t **lockspace);
/*
* dlm_release_lockspace