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
  33 struct 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
  54 extern struct workqueue_struct *user_dlm_worker;
  55
  56 void user_dlm_lock_res_init(struct user_lock_res *lockres,
  57                             struct dentry *dentry);
  58 int user_dlm_destroy_lock(struct user_lock_res *lockres);
  59 int user_dlm_cluster_lock(struct user_lock_res *lockres,
  60                           int level,
  61                           int lkm_flags);
  62 void user_dlm_cluster_unlock(struct user_lock_res *lockres,
  63                              int level);
  64 void user_dlm_write_lvb(struct inode *inode,
  65                         const char *val,
  66                         unsigned int len);
  67 bool user_dlm_read_lvb(struct inode *inode, char *val);
  68 struct ocfs2_cluster_connection *user_dlm_register(const struct qstr *name);
  69 void user_dlm_unregister(struct ocfs2_cluster_connection *conn);
  70 void user_dlm_set_locking_protocol(void);
  71
  72 struct 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
  81 static inline struct dlmfs_inode_private *
  82 DLMFS_I(struct inode *inode)
  83 {
  84         return container_of(inode,
  85                             struct dlmfs_inode_private,
  86                             ip_vfs_inode);
  87 }
  88
  89 struct dlmfs_filp_private {
  90         int                  fp_lock_level;
  91 };
  92
  93 #define DLMFS_MAGIC     0x76a9f425
  94
  95 #endif /* USERDLM_H */