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72a8e9e171
Dlmglue is built on top of this. Bring in the portions we need which includes the stackglue API as well as most of the fs/dlm implementation. I left off the Ocfs2 specific version and connection handling. Also left out is the old Ocfs2 dlm support which we'll never want. Like dlmglue, we keep as much of the generic stackglue code in tact here. This will make translating to/from upstream patches much easier. Signed-off-by: Mark Fasheh <mfasheh@versity.com>
150 lines
4.2 KiB
C
150 lines
4.2 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* stackglue.h
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*
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* Glue to the underlying cluster stack.
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*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#ifndef STACKGLUE_H
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#define STACKGLUE_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/dlmconstants.h>
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#include <linux/dlm.h>
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#include <linux/dlm_plock.h>
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#define DLM_LVB_LEN 64
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/* Needed for plock-related prototypes */
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struct file;
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struct file_lock;
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/* Scoutfs never uses this flag, we define it to zero to avoid errors */
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#define DLM_LKF_LOCAL 0
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/*
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* This shadows DLM_LOCKSPACE_LEN in fs/dlm/dlm_internal.h. That probably
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* wants to be in a public header.
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*/
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#define GROUP_NAME_MAX 64
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/* This shadows OCFS2_CLUSTER_NAME_LEN */
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#define CLUSTER_NAME_MAX 16
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/*
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* ocfs2_protocol_version changes when ocfs2 does something different in
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* its inter-node behavior. See dlmglue.c for more information.
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*/
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struct ocfs2_protocol_version {
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u8 pv_major;
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u8 pv_minor;
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};
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/*
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* The dlm_lockstatus struct includes lvb space, but the dlm_lksb struct only
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* has a pointer to separately allocated lvb space. This struct exists only to
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* include in the lksb union to make space for a combined dlm_lksb and lvb.
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*/
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struct fsdlm_lksb_plus_lvb {
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struct dlm_lksb lksb;
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char lvb[DLM_LVB_LEN];
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};
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/*
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* A union of all lock status structures. We define it here so that the
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* size of the union is known. Lock status structures are embedded in
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* ocfs2 inodes.
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*/
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struct ocfs2_cluster_connection;
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struct ocfs2_dlm_lksb {
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union {
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struct dlm_lksb lksb_fsdlm;
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struct fsdlm_lksb_plus_lvb padding;
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};
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struct ocfs2_cluster_connection *lksb_conn;
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};
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/*
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* The ocfs2_locking_protocol defines the handlers called on ocfs2's behalf.
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*/
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struct ocfs2_locking_protocol {
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struct ocfs2_protocol_version lp_max_version;
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void (*lp_lock_ast)(struct ocfs2_dlm_lksb *lksb);
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void (*lp_blocking_ast)(struct ocfs2_dlm_lksb *lksb, int level);
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void (*lp_unlock_ast)(struct ocfs2_dlm_lksb *lksb, int error);
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};
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/*
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* A cluster connection. Mostly opaque to ocfs2, the connection holds
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* state for the underlying stack. ocfs2 does use cc_version to determine
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* locking compatibility.
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*/
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struct ocfs2_cluster_connection {
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char cc_name[GROUP_NAME_MAX + 1];
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int cc_namelen;
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char cc_cluster_name[CLUSTER_NAME_MAX + 1];
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int cc_cluster_name_len;
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struct ocfs2_protocol_version cc_version;
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struct ocfs2_locking_protocol *cc_proto;
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void (*cc_recovery_handler)(int node_num, void *recovery_data);
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void *cc_recovery_data;
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void *cc_lockspace;
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void *cc_private;
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};
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/* In ocfs2_downconvert_lock(), we need to know which stack we are using */
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static inline int ocfs2_is_o2cb_active(void)
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{
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return 0;
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}
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/* Used by the filesystem */
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int ocfs2_cluster_connect(const char *stack_name,
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const char *cluster_name,
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int cluster_name_len,
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const char *group,
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int grouplen,
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struct ocfs2_locking_protocol *lproto,
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void (*recovery_handler)(int node_num,
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void *recovery_data),
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void *recovery_data,
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struct ocfs2_cluster_connection **conn);
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int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
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int hangup_pending);
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struct ocfs2_lock_res;
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int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn,
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int mode,
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struct ocfs2_dlm_lksb *lksb,
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u32 flags,
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void *name,
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unsigned int namelen);
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int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn,
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struct ocfs2_dlm_lksb *lksb,
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u32 flags);
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int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb);
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int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb);
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void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb);
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void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb);
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int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
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struct file *file, int cmd, struct file_lock *fl);
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#endif /* STACKGLUE_H */
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