vfs_dir.c revision ee443996a35c1e04f210cafd43d5a98d41e46085 
1/*
2 * linux/fs/9p/vfs_dir.c
3 *
4 * This file contains vfs directory ops for the 9P2000 protocol.
5 *
6 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 *  This program is free software; you can redistribute it and/or modify
10 *  it under the terms of the GNU General Public License version 2
11 *  as published by the Free Software Foundation.
12 *
13 *  This program is distributed in the hope that it will be useful,
14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *  GNU General Public License for more details.
17 *
18 *  You should have received a copy of the GNU General Public License
19 *  along with this program; if not, write to:
20 *  Free Software Foundation
21 *  51 Franklin Street, Fifth Floor
22 *  Boston, MA  02111-1301  USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/file.h>
30#include <linux/stat.h>
31#include <linux/string.h>
32#include <linux/sched.h>
33#include <linux/inet.h>
34#include <linux/idr.h>
35#include <net/9p/9p.h>
36#include <net/9p/client.h>
37
38#include "v9fs.h"
39#include "v9fs_vfs.h"
40#include "fid.h"
41
42/**
43 * dt_type - return file type
44 * @mistat: mistat structure
45 *
46 */
47
48static inline int dt_type(struct p9_stat *mistat)
49{
50	unsigned long perm = mistat->mode;
51	int rettype = DT_REG;
52
53	if (perm & P9_DMDIR)
54		rettype = DT_DIR;
55	if (perm & P9_DMSYMLINK)
56		rettype = DT_LNK;
57
58	return rettype;
59}
60
61/**
62 * v9fs_dir_readdir - read a directory
63 * @filp: opened file structure
64 * @dirent: directory structure ???
65 * @filldir: function to populate directory structure ???
66 *
67 */
68
69static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
70{
71	int over;
72	struct p9_fid *fid;
73	struct v9fs_session_info *v9ses;
74	struct inode *inode;
75	struct p9_stat *st;
76
77	P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
78	inode = filp->f_path.dentry->d_inode;
79	v9ses = v9fs_inode2v9ses(inode);
80	fid = filp->private_data;
81	while ((st = p9_client_dirread(fid, filp->f_pos)) != NULL) {
82		if (IS_ERR(st))
83			return PTR_ERR(st);
84
85		over = filldir(dirent, st->name.str, st->name.len, filp->f_pos,
86			v9fs_qid2ino(&st->qid), dt_type(st));
87
88		if (over)
89			break;
90
91		filp->f_pos += st->size;
92		kfree(st);
93		st = NULL;
94	}
95
96	kfree(st);
97	return 0;
98}
99
100
101/**
102 * v9fs_dir_release - close a directory
103 * @inode: inode of the directory
104 * @filp: file pointer to a directory
105 *
106 */
107
108int v9fs_dir_release(struct inode *inode, struct file *filp)
109{
110	struct p9_fid *fid;
111
112	fid = filp->private_data;
113	P9_DPRINTK(P9_DEBUG_VFS,
114			"inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
115	filemap_write_and_wait(inode->i_mapping);
116	p9_client_clunk(fid);
117	return 0;
118}
119
120const struct file_operations v9fs_dir_operations = {
121	.read = generic_read_dir,
122	.readdir = v9fs_dir_readdir,
123	.open = v9fs_file_open,
124	.release = v9fs_dir_release,
125};
126