blob: c478a73841863c5f0e6fec75e86359f1aa7c08ea [file] [log] [blame]
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -07001/*
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 as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to:
21 * Free Software Foundation
22 * 51 Franklin Street, Fifth Floor
23 * Boston, MA 02111-1301 USA
24 *
25 */
26
27#include <linux/module.h>
28#include <linux/errno.h>
29#include <linux/fs.h>
30#include <linux/file.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/smp_lock.h>
34#include <linux/inet.h>
35#include <linux/idr.h>
36
37#include "debug.h"
38#include "v9fs.h"
39#include "9p.h"
40#include "v9fs_vfs.h"
41#include "conv.h"
42#include "fid.h"
43
44/**
45 * dt_type - return file type
46 * @mistat: mistat structure
47 *
48 */
49
50static inline int dt_type(struct v9fs_stat *mistat)
51{
52 unsigned long perm = mistat->mode;
53 int rettype = DT_REG;
54
55 if (perm & V9FS_DMDIR)
56 rettype = DT_DIR;
57 if (perm & V9FS_DMSYMLINK)
58 rettype = DT_LNK;
59
60 return rettype;
61}
62
63/**
64 * v9fs_dir_readdir - read a directory
65 * @filep: opened file structure
66 * @dirent: directory structure ???
67 * @filldir: function to populate directory structure ???
68 *
69 */
70
71static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
72{
73 struct v9fs_fcall *fcall = NULL;
74 struct inode *inode = filp->f_dentry->d_inode;
75 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
76 struct v9fs_fid *file = filp->private_data;
77 unsigned int i, n;
78 int fid = -1;
79 int ret = 0;
80 struct v9fs_stat *mi = NULL;
81 int over = 0;
82
83 dprintk(DEBUG_VFS, "name %s\n", filp->f_dentry->d_name.name);
84
85 fid = file->fid;
86
87 mi = kmalloc(v9ses->maxdata, GFP_KERNEL);
88 if (!mi)
89 return -ENOMEM;
90
91 if (file->rdir_fcall && (filp->f_pos != file->rdir_pos)) {
92 kfree(file->rdir_fcall);
93 file->rdir_fcall = NULL;
94 }
95
96 if (file->rdir_fcall) {
97 n = file->rdir_fcall->params.rread.count;
98 i = file->rdir_fpos;
99 while (i < n) {
100 int s = v9fs_deserialize_stat(v9ses,
101 file->rdir_fcall->params.rread.data + i,
102 n - i, mi, v9ses->maxdata);
103
104 if (s == 0) {
105 dprintk(DEBUG_ERROR,
106 "error while deserializing mistat\n");
107 ret = -EIO;
108 goto FreeStructs;
109 }
110
111 over = filldir(dirent, mi->name, strlen(mi->name),
112 filp->f_pos, v9fs_qid2ino(&mi->qid),
113 dt_type(mi));
114
115 if (over) {
116 file->rdir_fpos = i;
117 file->rdir_pos = filp->f_pos;
118 break;
119 }
120
121 i += s;
122 filp->f_pos += s;
123 }
124
125 if (!over) {
126 kfree(file->rdir_fcall);
127 file->rdir_fcall = NULL;
128 }
129 }
130
131 while (!over) {
132 ret = v9fs_t_read(v9ses, fid, filp->f_pos,
133 v9ses->maxdata-V9FS_IOHDRSZ, &fcall);
134 if (ret < 0) {
135 dprintk(DEBUG_ERROR, "error while reading: %d: %p\n",
136 ret, fcall);
137 goto FreeStructs;
138 } else if (ret == 0)
139 break;
140
141 n = ret;
142 i = 0;
143 while (i < n) {
144 int s = v9fs_deserialize_stat(v9ses,
145 fcall->params.rread.data + i, n - i, mi,
146 v9ses->maxdata);
147
148 if (s == 0) {
149 dprintk(DEBUG_ERROR,
150 "error while deserializing mistat\n");
151 return -EIO;
152 }
153
154 over = filldir(dirent, mi->name, strlen(mi->name),
155 filp->f_pos, v9fs_qid2ino(&mi->qid),
156 dt_type(mi));
157
158 if (over) {
159 file->rdir_fcall = fcall;
160 file->rdir_fpos = i;
161 file->rdir_pos = filp->f_pos;
162 fcall = NULL;
163 break;
164 }
165
166 i += s;
167 filp->f_pos += s;
168 }
169
170 kfree(fcall);
171 }
172
173 FreeStructs:
174 kfree(fcall);
175 kfree(mi);
176 return ret;
177}
178
179/**
180 * v9fs_dir_release - close a directory
181 * @inode: inode of the directory
182 * @filp: file pointer to a directory
183 *
184 */
185
186int v9fs_dir_release(struct inode *inode, struct file *filp)
187{
188 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
189 struct v9fs_fid *fid = filp->private_data;
190 int fidnum = -1;
191
192 dprintk(DEBUG_VFS, "inode: %p filp: %p fid: %d\n", inode, filp,
193 fid->fid);
194 fidnum = fid->fid;
195
196 filemap_fdatawrite(inode->i_mapping);
197 filemap_fdatawait(inode->i_mapping);
198
199 if (fidnum >= 0) {
200 fid->fidopen--;
201 dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
202 fid->fid);
203
204 if (fid->fidopen == 0) {
205 if (v9fs_t_clunk(v9ses, fidnum, NULL))
206 dprintk(DEBUG_ERROR, "clunk failed\n");
207
208 v9fs_put_idpool(fid->fid, &v9ses->fidpool);
209 }
210
211 kfree(fid->rdir_fcall);
212
213 filp->private_data = NULL;
214 v9fs_fid_destroy(fid);
215 }
216
217 d_drop(filp->f_dentry);
218 return 0;
219}
220
221struct file_operations v9fs_dir_operations = {
222 .read = generic_read_dir,
223 .readdir = v9fs_dir_readdir,
224 .open = v9fs_file_open,
225 .release = v9fs_dir_release,
226};