IB/ipath: Remove incompletely implemented ipath_runtime flags and code
[linux-2.6] / fs / 9p / vfs_dir.c
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
36 #include "debug.h"
37 #include "v9fs.h"
38 #include "9p.h"
39 #include "conv.h"
40 #include "v9fs_vfs.h"
41 #include "fid.h"
42
43 /**
44  * dt_type - return file type
45  * @mistat: mistat structure
46  *
47  */
48
49 static inline int dt_type(struct v9fs_stat *mistat)
50 {
51         unsigned long perm = mistat->mode;
52         int rettype = DT_REG;
53
54         if (perm & V9FS_DMDIR)
55                 rettype = DT_DIR;
56         if (perm & V9FS_DMSYMLINK)
57                 rettype = DT_LNK;
58
59         return rettype;
60 }
61
62 /**
63  * v9fs_dir_readdir - read a directory
64  * @filep: opened file structure
65  * @dirent: directory structure ???
66  * @filldir: function to populate directory structure ???
67  *
68  */
69
70 static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
71 {
72         struct v9fs_fcall *fcall = NULL;
73         struct inode *inode = filp->f_path.dentry->d_inode;
74         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
75         struct v9fs_fid *file = filp->private_data;
76         unsigned int i, n, s;
77         int fid = -1;
78         int ret = 0;
79         struct v9fs_stat stat;
80         int over = 0;
81
82         dprintk(DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
83
84         fid = file->fid;
85
86         if (file->rdir_fcall && (filp->f_pos != file->rdir_pos)) {
87                 kfree(file->rdir_fcall);
88                 file->rdir_fcall = NULL;
89         }
90
91         if (file->rdir_fcall) {
92                 n = file->rdir_fcall->params.rread.count;
93                 i = file->rdir_fpos;
94                 while (i < n) {
95                         s = v9fs_deserialize_stat(
96                                 file->rdir_fcall->params.rread.data + i,
97                                 n - i, &stat, v9ses->extended);
98
99                         if (s == 0) {
100                                 dprintk(DEBUG_ERROR,
101                                         "error while deserializing stat\n");
102                                 ret = -EIO;
103                                 goto FreeStructs;
104                         }
105
106                         over = filldir(dirent, stat.name.str, stat.name.len,
107                                     filp->f_pos, v9fs_qid2ino(&stat.qid),
108                                     dt_type(&stat));
109
110                         if (over) {
111                                 file->rdir_fpos = i;
112                                 file->rdir_pos = filp->f_pos;
113                                 break;
114                         }
115
116                         i += s;
117                         filp->f_pos += s;
118                 }
119
120                 if (!over) {
121                         kfree(file->rdir_fcall);
122                         file->rdir_fcall = NULL;
123                 }
124         }
125
126         while (!over) {
127                 ret = v9fs_t_read(v9ses, fid, filp->f_pos,
128                         v9ses->maxdata-V9FS_IOHDRSZ, &fcall);
129                 if (ret < 0) {
130                         dprintk(DEBUG_ERROR, "error while reading: %d: %p\n",
131                                 ret, fcall);
132                         goto FreeStructs;
133                 } else if (ret == 0)
134                         break;
135
136                 n = ret;
137                 i = 0;
138                 while (i < n) {
139                         s = v9fs_deserialize_stat(fcall->params.rread.data + i,
140                                 n - i, &stat, v9ses->extended);
141
142                         if (s == 0) {
143                                 dprintk(DEBUG_ERROR,
144                                         "error while deserializing stat\n");
145                                 return -EIO;
146                         }
147
148                         over = filldir(dirent, stat.name.str, stat.name.len,
149                                     filp->f_pos, v9fs_qid2ino(&stat.qid),
150                                     dt_type(&stat));
151
152                         if (over) {
153                                 file->rdir_fcall = fcall;
154                                 file->rdir_fpos = i;
155                                 file->rdir_pos = filp->f_pos;
156                                 fcall = NULL;
157                                 break;
158                         }
159
160                         i += s;
161                         filp->f_pos += s;
162                 }
163
164                 kfree(fcall);
165         }
166
167       FreeStructs:
168         kfree(fcall);
169         return ret;
170 }
171
172 /**
173  * v9fs_dir_release - close a directory
174  * @inode: inode of the directory
175  * @filp: file pointer to a directory
176  *
177  */
178
179 int v9fs_dir_release(struct inode *inode, struct file *filp)
180 {
181         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
182         struct v9fs_fid *fid = filp->private_data;
183         int fidnum = -1;
184
185         dprintk(DEBUG_VFS, "inode: %p filp: %p fid: %d\n", inode, filp,
186                 fid->fid);
187         fidnum = fid->fid;
188
189         filemap_write_and_wait(inode->i_mapping);
190
191         if (fidnum >= 0) {
192                 dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
193                         fid->fid);
194
195                 if (v9fs_t_clunk(v9ses, fidnum))
196                         dprintk(DEBUG_ERROR, "clunk failed\n");
197
198                 kfree(fid->rdir_fcall);
199                 kfree(fid);
200
201                 filp->private_data = NULL;
202         }
203
204         return 0;
205 }
206
207 const struct file_operations v9fs_dir_operations = {
208         .read = generic_read_dir,
209         .readdir = v9fs_dir_readdir,
210         .open = v9fs_file_open,
211         .release = v9fs_dir_release,
212 };