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
48 static 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 * @filep: opened file structure
64 * @dirent: directory structure ???
65 * @filldir: function to populate directory structure ???
66 *
67 */
68
69 static 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
108 int 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
120 const 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
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