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>
113 lines
3.3 KiB
C
113 lines
3.3 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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* userdlm.h
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*
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* Userspace dlm defines
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*
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* Copyright (C) 2002, 2004 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; either
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* version 2 of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef USERDLM_H
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#define USERDLM_H
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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/* user_lock_res->l_flags flags. */
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#define USER_LOCK_ATTACHED (0x00000001) /* have we initialized
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* the lvb */
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#define USER_LOCK_BUSY (0x00000002) /* we are currently in
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* dlm_lock */
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#define USER_LOCK_BLOCKED (0x00000004) /* blocked waiting to
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* downconvert*/
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#define USER_LOCK_IN_TEARDOWN (0x00000008) /* we're currently
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* destroying this
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* lock. */
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#define USER_LOCK_QUEUED (0x00000010) /* lock is on the
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* workqueue */
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#define USER_LOCK_IN_CANCEL (0x00000020)
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struct user_lock_res {
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spinlock_t l_lock;
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int l_flags;
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#define USER_DLM_LOCK_ID_MAX_LEN 32
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char l_name[USER_DLM_LOCK_ID_MAX_LEN];
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int l_namelen;
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int l_level;
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unsigned int l_ro_holders;
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unsigned int l_ex_holders;
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struct dlm_lockstatus l_lksb;
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int l_requested;
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int l_blocking;
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wait_queue_head_t l_event;
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struct work_struct l_work;
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};
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extern struct workqueue_struct *user_dlm_worker;
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void user_dlm_lock_res_init(struct user_lock_res *lockres,
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struct dentry *dentry);
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int user_dlm_destroy_lock(struct user_lock_res *lockres);
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int user_dlm_cluster_lock(struct user_lock_res *lockres,
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int level,
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int lkm_flags);
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void user_dlm_cluster_unlock(struct user_lock_res *lockres,
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int level);
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void user_dlm_write_lvb(struct inode *inode,
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const char *val,
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unsigned int len);
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void user_dlm_read_lvb(struct inode *inode,
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char *val,
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unsigned int len);
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struct dlm_ctxt *user_dlm_register_context(struct qstr *name,
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struct dlm_protocol_version *proto);
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void user_dlm_unregister_context(struct dlm_ctxt *dlm);
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struct dlmfs_inode_private {
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struct dlm_ctxt *ip_dlm;
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struct user_lock_res ip_lockres; /* unused for directories. */
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struct inode *ip_parent;
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struct inode ip_vfs_inode;
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};
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static inline struct dlmfs_inode_private *
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DLMFS_I(struct inode *inode)
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{
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return container_of(inode,
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struct dlmfs_inode_private,
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ip_vfs_inode);
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}
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struct dlmfs_filp_private {
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int fp_lock_level;
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};
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#define DLMFS_MAGIC 0x76a9f425
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#endif /* USERDLM_H */
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