text: /* -*- mode: c; c-basic-offset: 8; -*-
   * vim: noexpandtab sw=8 ts=8 sts=0:
   *
   * dlmglue.h
   *
   * description here
   *
   * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public
   * License as published by the Free Software Foundation; either
   * version 2 of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public
   * License along with this program; if not, write to the
   * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   * Boston, MA 021110-1307, USA.
   */
  
  
  #ifndef DLMGLUE_H
  #define DLMGLUE_H
  
  #include "dcache.h"
  
  #define OCFS2_LVB_VERSION 5
  
  struct ocfs2_meta_lvb {
  	__u8         lvb_version;
  	__u8         lvb_reserved0;
  	__be16       lvb_idynfeatures;
  	__be32       lvb_iclusters;
  	__be32       lvb_iuid;
  	__be32       lvb_igid;
  	__be64       lvb_iatime_packed;
  	__be64       lvb_ictime_packed;
  	__be64       lvb_imtime_packed;
  	__be64       lvb_isize;
  	__be16       lvb_imode;
  	__be16       lvb_inlink;
  	__be32       lvb_iattr;
  	__be32       lvb_igeneration;
  	__be32       lvb_reserved2;
  };
  
  #define OCFS2_QINFO_LVB_VERSION 1
  
  struct ocfs2_qinfo_lvb {
  	__u8	lvb_version;
  	__u8	lvb_reserved[3];
  	__be32	lvb_bgrace;
  	__be32	lvb_igrace;
  	__be32	lvb_syncms;
  	__be32	lvb_blocks;
  	__be32	lvb_free_blk;
  	__be32	lvb_free_entry;
  };
  
  #define OCFS2_ORPHAN_LVB_VERSION 1
  
  struct ocfs2_orphan_scan_lvb {
  	__u8	lvb_version;
  	__u8	lvb_reserved[3];
  	__be32	lvb_os_seqno;
  };
  
  /* ocfs2_inode_lock_full() 'arg_flags' flags */
  /* don't wait on recovery. */
  #define OCFS2_META_LOCK_RECOVERY	(0x01)
  /* Instruct the dlm not to queue ourselves on the other node. */
  #define OCFS2_META_LOCK_NOQUEUE		(0x02)
  /* don't block waiting for the downconvert thread, instead return -EAGAIN */
  #define OCFS2_LOCK_NONBLOCK		(0x04)
  
  /* Locking subclasses of inode cluster lock */
  enum {
  	OI_LS_NORMAL = 0,
  	OI_LS_PARENT,
  	OI_LS_RENAME1,
  	OI_LS_RENAME2,
  	OI_LS_REFLINK_TARGET,
  };
  
  int ocfs2_dlm_init(struct ocfs2_super *osb);
  void ocfs2_dlm_shutdown(struct ocfs2_super *osb, int hangup_pending);
  void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
  void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
  			       enum ocfs2_lock_type type,
  			       unsigned int generation,
  			       struct inode *inode);
  void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
  				u64 parent, struct inode *inode);
  struct ocfs2_file_private;
  void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
  			      struct ocfs2_file_private *fp);
  struct ocfs2_mem_dqinfo;
  void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
                                 struct ocfs2_mem_dqinfo *info);
  void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
  				  struct ocfs2_super *osb, u64 ref_blkno,
  				  unsigned int generation);
  void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
  int ocfs2_create_new_inode_locks(struct inode *inode);
  int ocfs2_drop_inode_locks(struct inode *inode);
  int ocfs2_rw_lock(struct inode *inode, int write);
  void ocfs2_rw_unlock(struct inode *inode, int write);
  int ocfs2_open_lock(struct inode *inode);
  int ocfs2_try_open_lock(struct inode *inode, int write);
  void ocfs2_open_unlock(struct inode *inode);
  int ocfs2_inode_lock_atime(struct inode *inode,
  			  struct vfsmount *vfsmnt,
  			  int *level);
  int ocfs2_inode_lock_full_nested(struct inode *inode,
  			 struct buffer_head **ret_bh,
  			 int ex,
  			 int arg_flags,
  			 int subclass);
  int ocfs2_inode_lock_with_page(struct inode *inode,
  			      struct buffer_head **ret_bh,
  			      int ex,
  			      struct page *page);
  /* Variants without special locking class or flags */
  #define ocfs2_inode_lock_full(i, r, e, f)\
  		ocfs2_inode_lock_full_nested(i, r, e, f, OI_LS_NORMAL)
  #define ocfs2_inode_lock_nested(i, b, e, s)\
  		ocfs2_inode_lock_full_nested(i, b, e, 0, s)
  /* 99% of the time we don't want to supply any additional flags --
   * those are for very specific cases only. */
  #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, OI_LS_NORMAL)
  void ocfs2_inode_unlock(struct inode *inode,
  		       int ex);
  int ocfs2_super_lock(struct ocfs2_super *osb,
  		     int ex);
  void ocfs2_super_unlock(struct ocfs2_super *osb,
  			int ex);
  int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno);
  void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno);
  
  int ocfs2_rename_lock(struct ocfs2_super *osb);
  void ocfs2_rename_unlock(struct ocfs2_super *osb);
  int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex);
  void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex);
  int ocfs2_dentry_lock(struct dentry *dentry, int ex);
  void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
  int ocfs2_file_lock(struct file *file, int ex, int trylock);
  void ocfs2_file_unlock(struct file *file);
  int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex);
  void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex);
  struct ocfs2_refcount_tree;
  int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex);
  void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex);
  
  
  void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
  void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
  			       struct ocfs2_lock_res *lockres);
  
  /* for the downconvert thread */
  void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb);
  
  struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
  void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
  
  /* To set the locking protocol on module initialization */
  void ocfs2_set_locking_protocol(void);
  #endif	/* DLMGLUE_H */
  