forked from luck/tmp_suning_uos_patched
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>
114 lines
3.3 KiB
C
114 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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