ocfs2/dlmfs/userdlm.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * userdlm.h
0004  *
0005  * Userspace dlm defines
0006  *
0007  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
0008  */
0009
0010
0011 #ifndef USERDLM_H
0012 #define USERDLM_H
0013
0014 #include <linux/module.h>
0015 #include <linux/fs.h>
0016 #include <linux/types.h>
0017 #include <linux/workqueue.h>
0018
0019 /* user_lock_res->l_flags flags. */
0020 #define USER_LOCK_ATTACHED      (0x00000001) /* we have initialized
0021                            * the lvb */
0022 #define USER_LOCK_BUSY          (0x00000002) /* we are currently in
0023                            * dlm_lock */
0024 #define USER_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
0025                           * downconvert*/
0026 #define USER_LOCK_IN_TEARDOWN   (0x00000008) /* we're currently
0027                           * destroying this
0028                           * lock. */
0029 #define USER_LOCK_QUEUED        (0x00000010) /* lock is on the
0030                           * workqueue */
0031 #define USER_LOCK_IN_CANCEL     (0x00000020)
0032
0033 struct user_lock_res {
0034     spinlock_t               l_lock;
0035
0036     int                      l_flags;
0037
0038 #define USER_DLM_LOCK_ID_MAX_LEN  32
0039     char                     l_name[USER_DLM_LOCK_ID_MAX_LEN];
0040     int                      l_namelen;
0041     int                      l_level;
0042     unsigned int             l_ro_holders;
0043     unsigned int             l_ex_holders;
0044     struct ocfs2_dlm_lksb    l_lksb;
0045
0046     int                      l_requested;
0047     int                      l_blocking;
0048
0049     wait_queue_head_t        l_event;
0050
0051     struct work_struct       l_work;
0052 };
0053
0054 extern struct workqueue_struct *user_dlm_worker;
0055
0056 void user_dlm_lock_res_init(struct user_lock_res *lockres,
0057                 struct dentry *dentry);
0058 int user_dlm_destroy_lock(struct user_lock_res *lockres);
0059 int user_dlm_cluster_lock(struct user_lock_res *lockres,
0060               int level,
0061               int lkm_flags);
0062 void user_dlm_cluster_unlock(struct user_lock_res *lockres,
0063                  int level);
0064 void user_dlm_write_lvb(struct inode *inode,
0065             const char *val,
0066             unsigned int len);
0067 bool user_dlm_read_lvb(struct inode *inode, char *val);
0068 struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
0069 void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
0070 void user_dlm_set_locking_protocol(void);
0071
0072 struct dlmfs_inode_private {
0073     struct ocfs2_cluster_connection *ip_conn;
0074
0075     struct user_lock_res ip_lockres; /* unused for directories. */
0076     struct inode         *ip_parent;
0077
0078     struct inode         ip_vfs_inode;
0079 };
0080
0081 static inline struct dlmfs_inode_private *
0082 DLMFS_I(struct inode *inode)
0083 {
0084         return container_of(inode,
0085                 struct dlmfs_inode_private,
0086                 ip_vfs_inode);
0087 }
0088
0089 struct dlmfs_filp_private {
0090     int                  fp_lock_level;
0091 };
0092
0093 #define DLMFS_MAGIC 0x76a9f425
0094
0095 #endif /* USERDLM_H */