| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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(const 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 */ |