fs/ocfs2/dlmglue.h

   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 /* ocfs2_inode_lock_full() 'arg_flags' flags */
  53 /* don't wait on recovery. */
  54 #define OCFS2_META_LOCK_RECOVERY        (0x01)
  55 /* Instruct the dlm not to queue ourselves on the other node. */
  56 #define OCFS2_META_LOCK_NOQUEUE         (0x02)
  57 /* don't block waiting for the downconvert thread, instead return -EAGAIN */
  58 #define OCFS2_LOCK_NONBLOCK             (0x04)
  59
  60 int ocfs2_dlm_init(struct ocfs2_super *osb);
  61 void ocfs2_dlm_shutdown(struct ocfs2_super *osb, int hangup_pending);
  62 void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
  63 void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
  64                                enum ocfs2_lock_type type,
  65                                unsigned int generation,
  66                                struct inode *inode);
  67 void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
  68                                 u64 parent, struct inode *inode);
  69 struct ocfs2_file_private;
  70 void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
  71                               struct ocfs2_file_private *fp);
  72 void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
  73 int ocfs2_create_new_inode_locks(struct inode *inode);
  74 int ocfs2_drop_inode_locks(struct inode *inode);
  75 int ocfs2_rw_lock(struct inode *inode, int write);
  76 void ocfs2_rw_unlock(struct inode *inode, int write);
  77 int ocfs2_open_lock(struct inode *inode);
  78 int ocfs2_try_open_lock(struct inode *inode, int write);
  79 void ocfs2_open_unlock(struct inode *inode);
  80 int ocfs2_inode_lock_atime(struct inode *inode,
  81                           struct vfsmount *vfsmnt,
  82                           int *level);
  83 int ocfs2_inode_lock_full(struct inode *inode,
  84                          struct buffer_head **ret_bh,
  85                          int ex,
  86                          int arg_flags);
  87 int ocfs2_inode_lock_with_page(struct inode *inode,
  88                               struct buffer_head **ret_bh,
  89                               int ex,
  90                               struct page *page);
  91 /* 99% of the time we don't want to supply any additional flags --
  92  * those are for very specific cases only. */
  93 #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full(i, b, e, 0)
  94 void ocfs2_inode_unlock(struct inode *inode,
  95                        int ex);
  96 int ocfs2_super_lock(struct ocfs2_super *osb,
  97                      int ex);
  98 void ocfs2_super_unlock(struct ocfs2_super *osb,
  99                         int ex);
 100 int ocfs2_rename_lock(struct ocfs2_super *osb);
 101 void ocfs2_rename_unlock(struct ocfs2_super *osb);
 102 int ocfs2_dentry_lock(struct dentry *dentry, int ex);
 103 void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
 104 int ocfs2_file_lock(struct file *file, int ex, int trylock);
 105 void ocfs2_file_unlock(struct file *file);
 106
 107 void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
 108 void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
 109                                struct ocfs2_lock_res *lockres);
 110
 111 /* for the downconvert thread */
 112 void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb);
 113
 114 struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
 115 void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
 116
 117 /* To set the locking protocol on module initialization */
 118 void ocfs2_set_locking_protocol(void);
 119 #endif  /* DLMGLUE_H */