/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * userdlm.h
 *
 * Userspace dlm defines
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 */


#ifndef USERDLM_H
#define USERDLM_H

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/workqueue.h>

/* user_lock_res->l_flags flags. */
#define USER_LOCK_ATTACHED      (0x00000001) /* we have initialized
                                               * the lvb */
#define USER_LOCK_BUSY          (0x00000002) /* we are currently in
                                               * dlm_lock */
#define USER_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
                                              * downconvert*/
#define USER_LOCK_IN_TEARDOWN   (0x00000008) /* we're currently
                                              * destroying this
                                              * lock. */
#define USER_LOCK_QUEUED        (0x00000010) /* lock is on the
                                              * workqueue */
#define USER_LOCK_IN_CANCEL     (0x00000020)

struct user_lock_res {
        spinlock_t               l_lock;

        int                      l_flags;

#define USER_DLM_LOCK_ID_MAX_LEN  32
        char                     l_name[USER_DLM_LOCK_ID_MAX_LEN];
        int                      l_namelen;
        int                      l_level;
        unsigned int             l_ro_holders;
        unsigned int             l_ex_holders;
        struct ocfs2_dlm_lksb    l_lksb;

        int                      l_requested;
        int                      l_blocking;

        wait_queue_head_t        l_event;

        struct work_struct       l_work;
};

extern struct workqueue_struct *user_dlm_worker;

void user_dlm_lock_res_init(struct user_lock_res *lockres,
                            struct dentry *dentry);
int user_dlm_destroy_lock(struct user_lock_res *lockres);
int user_dlm_cluster_lock(struct user_lock_res *lockres,
                          int level,
                          int lkm_flags);
void user_dlm_cluster_unlock(struct user_lock_res *lockres,
                             int level);
void user_dlm_write_lvb(struct inode *inode,
                        const char *val,
                        unsigned int len);
bool user_dlm_read_lvb(struct inode *inode, char *val);
struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
void user_dlm_set_locking_protocol(void);

struct dlmfs_inode_private {
        struct ocfs2_cluster_connection *ip_conn;

        struct user_lock_res ip_lockres; /* unused for directories. */
        struct inode         *ip_parent;

        struct inode         ip_vfs_inode;
};

static inline struct dlmfs_inode_private *
DLMFS_I(struct inode *inode)
{
        return container_of(inode,
                            struct dlmfs_inode_private,
                            ip_vfs_inode);
}

struct dlmfs_filp_private {
        int                  fp_lock_level;
};

#define DLMFS_MAGIC     0x76a9f425

#endif /* USERDLM_H */