1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * dlmglue.h 5 * 6 * description here 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 DLMGLUE_H 28 #define DLMGLUE_H 29 30 #include "dcache.h" 31 32 #define OCFS2_LVB_VERSION 5 33 34 struct ocfs2_meta_lvb { 35 __u8 lvb_version; 36 __u8 lvb_reserved0; 37 __be16 lvb_idynfeatures; 38 __be32 lvb_iclusters; 39 __be32 lvb_iuid; 40 __be32 lvb_igid; 41 __be64 lvb_iatime_packed; 42 __be64 lvb_ictime_packed; 43 __be64 lvb_imtime_packed; 44 __be64 lvb_isize; 45 __be16 lvb_imode; 46 __be16 lvb_inlink; 47 __be32 lvb_iattr; 48 __be32 lvb_igeneration; 49 __be32 lvb_reserved2; 50 }; 51 52 #define OCFS2_QINFO_LVB_VERSION 1 53 54 struct ocfs2_qinfo_lvb { 55 __u8 lvb_version; 56 __u8 lvb_reserved[3]; 57 __be32 lvb_bgrace; 58 __be32 lvb_igrace; 59 __be32 lvb_syncms; 60 __be32 lvb_blocks; 61 __be32 lvb_free_blk; 62 __be32 lvb_free_entry; 63 }; 64 65 #define OCFS2_ORPHAN_LVB_VERSION 1 66 67 struct ocfs2_orphan_scan_lvb { 68 __u8 lvb_version; 69 __u8 lvb_reserved[3]; 70 __be32 lvb_os_seqno; 71 }; 72 73 /* ocfs2_inode_lock_full() 'arg_flags' flags */ 74 /* don't wait on recovery. */ 75 #define OCFS2_META_LOCK_RECOVERY (0x01) 76 /* Instruct the dlm not to queue ourselves on the other node. */ 77 #define OCFS2_META_LOCK_NOQUEUE (0x02) 78 /* don't block waiting for the downconvert thread, instead return -EAGAIN */ 79 #define OCFS2_LOCK_NONBLOCK (0x04) 80 81 /* Locking subclasses of inode cluster lock */ 82 enum { 83 OI_LS_NORMAL = 0, 84 OI_LS_PARENT, 85 OI_LS_RENAME1, 86 OI_LS_RENAME2, 87 }; 88 89 int ocfs2_dlm_init(struct ocfs2_super *osb); 90 void ocfs2_dlm_shutdown(struct ocfs2_super *osb, int hangup_pending); 91 void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res); 92 void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, 93 enum ocfs2_lock_type type, 94 unsigned int generation, 95 struct inode *inode); 96 void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, 97 u64 parent, struct inode *inode); 98 struct ocfs2_file_private; 99 void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres, 100 struct ocfs2_file_private *fp); 101 struct ocfs2_mem_dqinfo; 102 void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres, 103 struct ocfs2_mem_dqinfo *info); 104 void ocfs2_lock_res_free(struct ocfs2_lock_res *res); 105 int ocfs2_create_new_inode_locks(struct inode *inode); 106 int ocfs2_drop_inode_locks(struct inode *inode); 107 int ocfs2_rw_lock(struct inode *inode, int write); 108 void ocfs2_rw_unlock(struct inode *inode, int write); 109 int ocfs2_open_lock(struct inode *inode); 110 int ocfs2_try_open_lock(struct inode *inode, int write); 111 void ocfs2_open_unlock(struct inode *inode); 112 int ocfs2_inode_lock_atime(struct inode *inode, 113 struct vfsmount *vfsmnt, 114 int *level); 115 int ocfs2_inode_lock_full_nested(struct inode *inode, 116 struct buffer_head **ret_bh, 117 int ex, 118 int arg_flags, 119 int subclass); 120 int ocfs2_inode_lock_with_page(struct inode *inode, 121 struct buffer_head **ret_bh, 122 int ex, 123 struct page *page); 124 /* Variants without special locking class or flags */ 125 #define ocfs2_inode_lock_full(i, r, e, f)\ 126 ocfs2_inode_lock_full_nested(i, r, e, f, OI_LS_NORMAL) 127 #define ocfs2_inode_lock_nested(i, b, e, s)\ 128 ocfs2_inode_lock_full_nested(i, b, e, 0, s) 129 /* 99% of the time we don't want to supply any additional flags -- 130 * those are for very specific cases only. */ 131 #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, OI_LS_NORMAL) 132 void ocfs2_inode_unlock(struct inode *inode, 133 int ex); 134 int ocfs2_super_lock(struct ocfs2_super *osb, 135 int ex); 136 void ocfs2_super_unlock(struct ocfs2_super *osb, 137 int ex); 138 int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno); 139 void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno); 140 141 int ocfs2_rename_lock(struct ocfs2_super *osb); 142 void ocfs2_rename_unlock(struct ocfs2_super *osb); 143 int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex); 144 void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex); 145 int ocfs2_dentry_lock(struct dentry *dentry, int ex); 146 void ocfs2_dentry_unlock(struct dentry *dentry, int ex); 147 int ocfs2_file_lock(struct file *file, int ex, int trylock); 148 void ocfs2_file_unlock(struct file *file); 149 int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex); 150 void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex); 151 152 153 void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres); 154 void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, 155 struct ocfs2_lock_res *lockres); 156 157 /* for the downconvert thread */ 158 void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb); 159 160 struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void); 161 void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug); 162 163 /* To set the locking protocol on module initialization */ 164 void ocfs2_set_locking_protocol(void); 165 #endif /* DLMGLUE_H */ 166