/*
   * V9FS FID Management
   *
   *  Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
   *
   *  This program is free software; you can redistribute it and/or modify

   *  it under the terms of the GNU General Public License version 2
   *  as published by the Free Software Foundation.

   *
   *  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:
   *  Free Software Foundation
   *  51 Franklin Street, Fifth Floor
   *  Boston, MA  02111-1301  USA
   *
   */

  #ifndef FS_9P_FID_H
  #define FS_9P_FID_H

  #include <linux/list.h>

  /**
   * struct v9fs_dentry - 9p private data stored in dentry d_fsdata
   * @lock: protects the fidlist
   * @fidlist: list of FIDs currently associated with this dentry
   *
   * This structure defines the 9p private data associated with
   * a particular dentry.  In particular, this private data is used
   * to lookup which 9P FID handle should be used for a particular VFS
   * operation.  FID handles are associated with dentries instead of
   * inodes in order to more closely map functionality to the Plan 9
   * expected behavior for FID reclaimation and tracking.
   *
   * See Also: Mapping FIDs to Linux VFS model in
   * Design and Implementation of the Linux 9P File System documentation
   */

  struct v9fs_dentry {
  	spinlock_t lock; /* protect fidlist */
  	struct list_head fidlist;

  };

  struct p9_fid *v9fs_fid_lookup(struct dentry *dentry);

  struct p9_fid *v9fs_fid_clone(struct dentry *dentry);
  int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid);

  struct p9_fid *v9fs_writeback_fid(struct dentry *dentry);

  #endif