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

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * userdlm.h
   4 *
   5 * Userspace dlm defines
   6 *
   7 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   8 */
   9
  10
  11#ifndef USERDLM_H
  12#define USERDLM_H
  13
  14#include <linux/module.h>
  15#include <linux/fs.h>
  16#include <linux/types.h>
  17#include <linux/workqueue.h>
  18
  19/* user_lock_res->l_flags flags. */
  20#define USER_LOCK_ATTACHED      (0x00000001) /* we have initialized
  21                                               * the lvb */
  22#define USER_LOCK_BUSY          (0x00000002) /* we are currently in
  23                                               * dlm_lock */
  24#define USER_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
  25                                              * downconvert*/
  26#define USER_LOCK_IN_TEARDOWN   (0x00000008) /* we're currently
  27                                              * destroying this
  28                                              * lock. */
  29#define USER_LOCK_QUEUED        (0x00000010) /* lock is on the
  30                                              * workqueue */
  31#define USER_LOCK_IN_CANCEL     (0x00000020)
  32
  33struct user_lock_res {
  34        spinlock_t               l_lock;
  35
  36        int                      l_flags;
  37
  38#define USER_DLM_LOCK_ID_MAX_LEN  32
  39        char                     l_name[USER_DLM_LOCK_ID_MAX_LEN];
  40        int                      l_namelen;
  41        int                      l_level;
  42        unsigned int             l_ro_holders;
  43        unsigned int             l_ex_holders;
  44        struct ocfs2_dlm_lksb    l_lksb;
  45
  46        int                      l_requested;
  47        int                      l_blocking;
  48
  49        wait_queue_head_t        l_event;
  50
  51        struct work_struct       l_work;
  52};
  53
  54extern struct workqueue_struct *user_dlm_worker;
  55
  56void user_dlm_lock_res_init(struct user_lock_res *lockres,
  57                            struct dentry *dentry);
  58int user_dlm_destroy_lock(struct user_lock_res *lockres);
  59int user_dlm_cluster_lock(struct user_lock_res *lockres,
  60                          int level,
  61                          int lkm_flags);
  62void user_dlm_cluster_unlock(struct user_lock_res *lockres,
  63                             int level);
  64void user_dlm_write_lvb(struct inode *inode,
  65                        const char *val,
  66                        unsigned int len);
  67bool user_dlm_read_lvb(struct inode *inode, char *val);
  68struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
  69void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
  70void user_dlm_set_locking_protocol(void);
  71
  72struct dlmfs_inode_private {
  73        struct ocfs2_cluster_connection *ip_conn;
  74
  75        struct user_lock_res ip_lockres; /* unused for directories. */
  76        struct inode         *ip_parent;
  77
  78        struct inode         ip_vfs_inode;
  79};
  80
  81static inline struct dlmfs_inode_private *
  82DLMFS_I(struct inode *inode)
  83{
  84        return container_of(inode,
  85                            struct dlmfs_inode_private,
  86                            ip_vfs_inode);
  87}
  88
  89struct dlmfs_filp_private {
  90        int                  fp_lock_level;
  91};
  92
  93#define DLMFS_MAGIC     0x76a9f425
  94
  95#endif /* USERDLM_H */
  96