LXR linux/fs/ocfs2/dlmfs/userdlm.h

   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
  49struct 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
  70extern struct workqueue_struct *user_dlm_worker;
  71
  72void user_dlm_lock_res_init(struct user_lock_res *lockres,
  73                            struct dentry *dentry);
  74int user_dlm_destroy_lock(struct user_lock_res *lockres);
  75int user_dlm_cluster_lock(struct user_lock_res *lockres,
  76                          int level,
  77                          int lkm_flags);
  78void user_dlm_cluster_unlock(struct user_lock_res *lockres,
  79                             int level);
  80void user_dlm_write_lvb(struct inode *inode,
  81                        const char *val,
  82                        unsigned int len);
  83ssize_t user_dlm_read_lvb(struct inode *inode,
  84                          char *val,
  85                          unsigned int len);
  86struct ocfs2_cluster_connection *user_dlm_register(struct qstr *name);
  87void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
  88void user_dlm_set_locking_protocol(void);
  89
  90struct 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
  99static inline struct dlmfs_inode_private *
 100DLMFS_I(struct inode *inode)
 101{
 102        return container_of(inode,
 103                            struct dlmfs_inode_private,
 104                            ip_vfs_inode);
 105}
 106
 107struct dlmfs_filp_private {
 108        int                  fp_lock_level;
 109};
 110
 111#define DLMFS_MAGIC     0x76a9f425
 112
 113#endif /* USERDLM_H */
 114