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 #define FID_OP   0
  26 #define FID_WALK 1
  27 #define FID_CREATE 2
  28
  29 struct v9fs_fid {
  30         struct list_head list;   /* list of fids associated with a dentry */
  31         struct list_head active; /* XXX - debug */
  32
  33         struct semaphore lock;
  34
  35         u32 fid;
  36         unsigned char fidopen;    /* set when fid is opened */
  37         unsigned char fidclunked; /* set when fid has already been clunked */
  38
  39         struct v9fs_qid qid;
  40         u32 iounit;
  41
  42         /* readdir stuff */
  43         int rdir_fpos;
  44         loff_t rdir_pos;
  45         struct v9fs_fcall *rdir_fcall;
  46
  47         /* management stuff */
  48         uid_t uid;              /* user associated with this fid */
  49
  50         /* private data */
  51         struct file *filp;      /* backpointer to File struct for open files */
  52         struct v9fs_session_info *v9ses;        /* session info for this FID */
  53 };
  54
  55 struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry);
  56 struct v9fs_fid *v9fs_fid_get_created(struct dentry *);
  57 void v9fs_fid_destroy(struct v9fs_fid *fid);
  58 struct v9fs_fid *v9fs_fid_create(struct v9fs_session_info *, int fid);
  59 int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry);
  60 struct v9fs_fid *v9fs_fid_clone(struct dentry *dentry);
  61 void v9fs_fid_clunk(struct v9fs_session_info *v9ses, struct v9fs_fid *fid);
  62