LXR linux/fs/9p/fid.h

   1/*
   2 * V9FS FID Management
   3 *
   4 *  Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
   5 *
   6 *  This program is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License version 2
   8 *  as published by the Free Software Foundation.
   9 *
  10 *  This program is distributed in the hope that it will be useful,
  11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 *  GNU General Public License for more details.
  14 *
  15 *  You should have received a copy of the GNU General Public License
  16 *  along with this program; if not, write to:
  17 *  Free Software Foundation
  18 *  51 Franklin Street, Fifth Floor
  19 *  Boston, MA  02111-1301  USA
  20 *
  21 */
  22
  23#include <linux/list.h>
  24
  25/**
  26 * struct v9fs_dentry - 9p private data stored in dentry d_fsdata
  27 * @lock: protects the fidlist
  28 * @fidlist: list of FIDs currently associated with this dentry
  29 *
  30 * This structure defines the 9p private data associated with
  31 * a particular dentry.  In particular, this private data is used
  32 * to lookup which 9P FID handle should be used for a particular VFS
  33 * operation.  FID handles are associated with dentries instead of
  34 * inodes in order to more closely map functionality to the Plan 9
  35 * expected behavior for FID reclaimation and tracking.
  36 *
  37 * See Also: Mapping FIDs to Linux VFS model in
  38 * Design and Implementation of the Linux 9P File System documentation
  39 */
  40struct v9fs_dentry {
  41        spinlock_t lock; /* protect fidlist */
  42        struct list_head fidlist;
  43};
  44
  45struct p9_fid *v9fs_fid_lookup(struct dentry *dentry);
  46struct p9_fid *v9fs_fid_clone(struct dentry *dentry);
  47int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid);
  48