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
  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 */