1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * userdlm.h 5 * 6 * Userspace dlm defines 7 * 8 * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public 12 * License as published by the Free Software Foundation; either 13 * version 2 of the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public 21 * License along with this program; if not, write to the 22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23 * Boston, MA 021110-1307, USA. 24 */ 25 26 27 #ifndef USERDLM_H 28 #define USERDLM_H 29 30 #include <linux/module.h> 31 #include <linux/fs.h> 32 #include <linux/types.h> 33 #include <linux/workqueue.h> 34 35 /* user_lock_res->l_flags flags. */ 36 #define USER_LOCK_ATTACHED (0x00000001) /* we have initialized 37 * the lvb */ 38 #define USER_LOCK_BUSY (0x00000002) /* we are currently in 39 * dlm_lock */ 40 #define USER_LOCK_BLOCKED (0x00000004) /* blocked waiting to 41 * downconvert*/ 42 #define USER_LOCK_IN_TEARDOWN (0x00000008) /* we're currently 43 * destroying this 44 * lock. */ 45 #define USER_LOCK_QUEUED (0x00000010) /* lock is on the 46 * workqueue */ 47 #define USER_LOCK_IN_CANCEL (0x00000020) 48 49 struct user_lock_res { 50 spinlock_t l_lock; 51 52 int l_flags; 53 54 #define USER_DLM_LOCK_ID_MAX_LEN 32 55 char l_name[USER_DLM_LOCK_ID_MAX_LEN]; 56 int l_namelen; 57 int l_level; 58 unsigned int l_ro_holders; 59 unsigned int l_ex_holders; 60 struct ocfs2_dlm_lksb l_lksb; 61 62 int l_requested; 63 int l_blocking; 64 65 wait_queue_head_t l_event; 66 67 struct work_struct l_work; 68 }; 69 70 extern struct workqueue_struct *user_dlm_worker; 71 72 void user_dlm_lock_res_init(struct user_lock_res *lockres, 73 struct dentry *dentry); 74 int user_dlm_destroy_lock(struct user_lock_res *lockres); 75 int user_dlm_cluster_lock(struct user_lock_res *lockres, 76 int level, 77 int lkm_flags); 78 void user_dlm_cluster_unlock(struct user_lock_res *lockres, 79 int level); 80 void user_dlm_write_lvb(struct inode *inode, 81 const char *val, 82 unsigned int len); 83 ssize_t user_dlm_read_lvb(struct inode *inode, 84 char *val, 85 unsigned int len); 86 struct ocfs2_cluster_connection *user_dlm_register(struct qstr *name); 87 void user_dlm_unregister(struct ocfs2_cluster_connection *conn); 88 void user_dlm_set_locking_protocol(void); 89 90 struct dlmfs_inode_private { 91 struct ocfs2_cluster_connection *ip_conn; 92 93 struct user_lock_res ip_lockres; /* unused for directories. */ 94 struct inode *ip_parent; 95 96 struct inode ip_vfs_inode; 97 }; 98 99 static inline struct dlmfs_inode_private * 100 DLMFS_I(struct inode *inode) 101 { 102 return container_of(inode, 103 struct dlmfs_inode_private, 104 ip_vfs_inode); 105 } 106 107 struct dlmfs_filp_private { 108 int fp_lock_level; 109 }; 110 111 #define DLMFS_MAGIC 0x76a9f425 112 113 #endif /* USERDLM_H */ 114