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 #define OCFS2_LVB_VERSION 3
  31
  32 struct ocfs2_meta_lvb {
  33         __be32       lvb_version;
  34         __be32       lvb_iclusters;
  35         __be32       lvb_iuid;
  36         __be32       lvb_igid;
  37         __be64       lvb_iatime_packed;
  38         __be64       lvb_ictime_packed;
  39         __be64       lvb_imtime_packed;
  40         __be64       lvb_isize;
  41         __be16       lvb_imode;
  42         __be16       lvb_inlink;
  43         __be32       lvb_iattr;
  44         __be32       lvb_reserved[2];
  45 };
  46
  47 /* ocfs2_meta_lock_full() and ocfs2_data_lock_full() 'arg_flags' flags */
  48 /* don't wait on recovery. */
  49 #define OCFS2_META_LOCK_RECOVERY        (0x01)
  50 /* Instruct the dlm not to queue ourselves on the other node. */
  51 #define OCFS2_META_LOCK_NOQUEUE         (0x02)
  52 /* don't block waiting for the vote thread, instead return -EAGAIN */
  53 #define OCFS2_LOCK_NONBLOCK             (0x04)
  54
  55 int ocfs2_dlm_init(struct ocfs2_super *osb);
  56 void ocfs2_dlm_shutdown(struct ocfs2_super *osb);
  57 void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
  58 void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
  59                                enum ocfs2_lock_type type,
  60                                struct inode *inode);
  61 void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
  62 int ocfs2_create_new_inode_locks(struct inode *inode);
  63 int ocfs2_drop_inode_locks(struct inode *inode);
  64 int ocfs2_data_lock_full(struct inode *inode,
  65                          int write,
  66                          int arg_flags);
  67 #define ocfs2_data_lock(inode, write) ocfs2_data_lock_full(inode, write, 0)
  68 int ocfs2_data_lock_with_page(struct inode *inode,
  69                               int write,
  70                               struct page *page);
  71 void ocfs2_data_unlock(struct inode *inode,
  72                        int write);
  73 int ocfs2_rw_lock(struct inode *inode, int write);
  74 void ocfs2_rw_unlock(struct inode *inode, int write);
  75 int ocfs2_meta_lock_full(struct inode *inode,
  76                          struct ocfs2_journal_handle *handle,
  77                          struct buffer_head **ret_bh,
  78                          int ex,
  79                          int arg_flags);
  80 int ocfs2_meta_lock_with_page(struct inode *inode,
  81                               struct ocfs2_journal_handle *handle,
  82                               struct buffer_head **ret_bh,
  83                               int ex,
  84                               struct page *page);
  85 /* 99% of the time we don't want to supply any additional flags --
  86  * those are for very specific cases only. */
  87 #define ocfs2_meta_lock(i, h, b, e) ocfs2_meta_lock_full(i, h, b, e, 0)
  88 void ocfs2_meta_unlock(struct inode *inode,
  89                        int ex);
  90 int ocfs2_super_lock(struct ocfs2_super *osb,
  91                      int ex);
  92 void ocfs2_super_unlock(struct ocfs2_super *osb,
  93                         int ex);
  94 int ocfs2_rename_lock(struct ocfs2_super *osb);
  95 void ocfs2_rename_unlock(struct ocfs2_super *osb);
  96 void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
  97
  98 /* for the vote thread */
  99 void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
 100                                 struct ocfs2_lock_res *lockres);
 101
 102 struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
 103 void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
 104
 105 /* aids in debugging and tracking lvbs */
 106 void ocfs2_dump_meta_lvb_info(u64 level,
 107                               const char *function,
 108                               unsigned int line,
 109                               struct ocfs2_lock_res *lockres);
 110 #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
 111
 112 #endif  /* DLMGLUE_H */