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 4
  33
  34 struct ocfs2_meta_lvb {
  35         __u8         lvb_version;
  36         __u8         lvb_reserved0;
  37         __be16       lvb_reserved1;
  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_meta_lock_full() and ocfs2_data_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 vote 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);
  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 void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
  70 int ocfs2_create_new_inode_locks(struct inode *inode);
  71 int ocfs2_drop_inode_locks(struct inode *inode);
  72 int ocfs2_data_lock_full(struct inode *inode,
  73                          int write,
  74                          int arg_flags);
  75 #define ocfs2_data_lock(inode, write) ocfs2_data_lock_full(inode, write, 0)
  76 int ocfs2_data_lock_with_page(struct inode *inode,
  77                               int write,
  78                               struct page *page);
  79 void ocfs2_data_unlock(struct inode *inode,
  80                        int write);
  81 int ocfs2_rw_lock(struct inode *inode, int write);
  82 void ocfs2_rw_unlock(struct inode *inode, int write);
  83 int ocfs2_meta_lock_atime(struct inode *inode,
  84                           struct vfsmount *vfsmnt,
  85                           int *level);
  86 int ocfs2_meta_lock_full(struct inode *inode,
  87                          struct buffer_head **ret_bh,
  88                          int ex,
  89                          int arg_flags);
  90 int ocfs2_meta_lock_with_page(struct inode *inode,
  91                               struct buffer_head **ret_bh,
  92                               int ex,
  93                               struct page *page);
  94 /* 99% of the time we don't want to supply any additional flags --
  95  * those are for very specific cases only. */
  96 #define ocfs2_meta_lock(i, b, e) ocfs2_meta_lock_full(i, b, e, 0)
  97 void ocfs2_meta_unlock(struct inode *inode,
  98                        int ex);
  99 int ocfs2_super_lock(struct ocfs2_super *osb,
 100                      int ex);
 101 void ocfs2_super_unlock(struct ocfs2_super *osb,
 102                         int ex);
 103 int ocfs2_rename_lock(struct ocfs2_super *osb);
 104 void ocfs2_rename_unlock(struct ocfs2_super *osb);
 105 int ocfs2_dentry_lock(struct dentry *dentry, int ex);
 106 void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
 107
 108 void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
 109 void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
 110                                struct ocfs2_lock_res *lockres);
 111
 112 /* for the vote thread */
 113 void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
 114                                 struct ocfs2_lock_res *lockres);
 115
 116 struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
 117 void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
 118
 119 /* aids in debugging and tracking lvbs */
 120 void ocfs2_dump_meta_lvb_info(u64 level,
 121                               const char *function,
 122                               unsigned int line,
 123                               struct ocfs2_lock_res *lockres);
 124 #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
 125
 126 #endif  /* DLMGLUE_H */