xref: /openbmc/linux/fs/9p/fid.h (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 
63