d24fbcda0c
Currently, when ocfs2 nodes connect via TCP, they advertise their compatibility level. If the versions do not match, two nodes cannot speak to each other and they disconnect. As a result, this provides no forward or backwards compatibility. This patch implements a simple protocol negotiation at the dlm level by introducing a major/minor version number scheme for entities that communicate. Specifically, o2dlm has a major/minor version for interaction with o2dlm on other nodes, and ocfs2 itself has a major/minor version for interacting with the filesystem on other nodes. This will allow rolling upgrades of ocfs2 clusters when changes to the locking or network protocols can be done in a backwards compatible manner. In those cases, only the minor number is changed and the negotatied protocol minor is returned from dlm join. In the far less likely event that a required protocol change makes backwards compatibility impossible, we simply bump the major number. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
|
|
* vim: noexpandtab sw=8 ts=8 sts=0:
|
|
*
|
|
* dlmglue.h
|
|
*
|
|
* description here
|
|
*
|
|
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
|
|
#ifndef DLMGLUE_H
|
|
#define DLMGLUE_H
|
|
|
|
#include "dcache.h"
|
|
|
|
#define OCFS2_LVB_VERSION 5
|
|
|
|
struct ocfs2_meta_lvb {
|
|
__u8 lvb_version;
|
|
__u8 lvb_reserved0;
|
|
__be16 lvb_idynfeatures;
|
|
__be32 lvb_iclusters;
|
|
__be32 lvb_iuid;
|
|
__be32 lvb_igid;
|
|
__be64 lvb_iatime_packed;
|
|
__be64 lvb_ictime_packed;
|
|
__be64 lvb_imtime_packed;
|
|
__be64 lvb_isize;
|
|
__be16 lvb_imode;
|
|
__be16 lvb_inlink;
|
|
__be32 lvb_iattr;
|
|
__be32 lvb_igeneration;
|
|
__be32 lvb_reserved2;
|
|
};
|
|
|
|
/* ocfs2_inode_lock_full() 'arg_flags' flags */
|
|
/* don't wait on recovery. */
|
|
#define OCFS2_META_LOCK_RECOVERY (0x01)
|
|
/* Instruct the dlm not to queue ourselves on the other node. */
|
|
#define OCFS2_META_LOCK_NOQUEUE (0x02)
|
|
/* don't block waiting for the downconvert thread, instead return -EAGAIN */
|
|
#define OCFS2_LOCK_NONBLOCK (0x04)
|
|
|
|
int ocfs2_dlm_init(struct ocfs2_super *osb);
|
|
void ocfs2_dlm_shutdown(struct ocfs2_super *osb);
|
|
void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
|
|
void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
|
|
enum ocfs2_lock_type type,
|
|
unsigned int generation,
|
|
struct inode *inode);
|
|
void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
|
|
u64 parent, struct inode *inode);
|
|
struct ocfs2_file_private;
|
|
void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
|
|
struct ocfs2_file_private *fp);
|
|
void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
|
|
int ocfs2_create_new_inode_locks(struct inode *inode);
|
|
int ocfs2_drop_inode_locks(struct inode *inode);
|
|
int ocfs2_rw_lock(struct inode *inode, int write);
|
|
void ocfs2_rw_unlock(struct inode *inode, int write);
|
|
int ocfs2_open_lock(struct inode *inode);
|
|
int ocfs2_try_open_lock(struct inode *inode, int write);
|
|
void ocfs2_open_unlock(struct inode *inode);
|
|
int ocfs2_inode_lock_atime(struct inode *inode,
|
|
struct vfsmount *vfsmnt,
|
|
int *level);
|
|
int ocfs2_inode_lock_full(struct inode *inode,
|
|
struct buffer_head **ret_bh,
|
|
int ex,
|
|
int arg_flags);
|
|
int ocfs2_inode_lock_with_page(struct inode *inode,
|
|
struct buffer_head **ret_bh,
|
|
int ex,
|
|
struct page *page);
|
|
/* 99% of the time we don't want to supply any additional flags --
|
|
* those are for very specific cases only. */
|
|
#define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full(i, b, e, 0)
|
|
void ocfs2_inode_unlock(struct inode *inode,
|
|
int ex);
|
|
int ocfs2_super_lock(struct ocfs2_super *osb,
|
|
int ex);
|
|
void ocfs2_super_unlock(struct ocfs2_super *osb,
|
|
int ex);
|
|
int ocfs2_rename_lock(struct ocfs2_super *osb);
|
|
void ocfs2_rename_unlock(struct ocfs2_super *osb);
|
|
int ocfs2_dentry_lock(struct dentry *dentry, int ex);
|
|
void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
|
|
int ocfs2_file_lock(struct file *file, int ex, int trylock);
|
|
void ocfs2_file_unlock(struct file *file);
|
|
|
|
void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
|
|
void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres);
|
|
|
|
/* for the downconvert thread */
|
|
void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
|
|
struct ocfs2_lock_res *lockres);
|
|
void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb);
|
|
|
|
struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
|
|
void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
|
|
|
|
extern const struct dlm_protocol_version ocfs2_locking_protocol;
|
|
#endif /* DLMGLUE_H */
|