2 * linux/fs/9p/vfs_dir.c
4 * This file contains vfs directory ops for the 9P2000 protocol.
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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.
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.
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
26 #include <linux/module.h>
27 #include <linux/errno.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 <linux/slab.h>
36 #include <net/9p/9p.h>
37 #include <net/9p/client.h>
44 * struct p9_rdir - readdir accounting
45 * @mutex: mutex protecting readdir
46 * @head: start offset of current dirread buffer
47 * @tail: end offset of current dirread buffer
48 * @buf: dirread buffer
50 * private structure for keeping track of readdir
62 * dt_type - return file type
63 * @mistat: mistat structure
67 static inline int dt_type(struct p9_wstat
*mistat
)
69 unsigned long perm
= mistat
->mode
;
74 if (perm
& P9_DMSYMLINK
)
80 static void p9stat_init(struct p9_wstat
*stbuf
)
86 stbuf
->extension
= NULL
;
90 * v9fs_dir_readdir - read a directory
91 * @filp: opened file structure
92 * @dirent: directory structure ???
93 * @filldir: function to populate directory structure ???
97 static int v9fs_dir_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
105 struct p9_rdir
*rdir
;
107 P9_DPRINTK(P9_DEBUG_VFS
, "name %s\n", filp
->f_path
.dentry
->d_name
.name
);
108 fid
= filp
->private_data
;
110 buflen
= fid
->clnt
->msize
- P9_IOHDRSZ
;
112 /* allocate rdir on demand */
114 rdir
= kmalloc(sizeof(struct p9_rdir
) + buflen
, GFP_KERNEL
);
120 spin_lock(&filp
->f_dentry
->d_lock
);
122 rdir
->buf
= (uint8_t *)rdir
+ sizeof(struct p9_rdir
);
123 mutex_init(&rdir
->mutex
);
124 rdir
->head
= rdir
->tail
= 0;
125 fid
->rdir
= (void *) rdir
;
128 spin_unlock(&filp
->f_dentry
->d_lock
);
131 rdir
= (struct p9_rdir
*) fid
->rdir
;
133 err
= mutex_lock_interruptible(&rdir
->mutex
);
137 if (rdir
->tail
== rdir
->head
) {
138 err
= v9fs_file_readn(filp
, rdir
->buf
, NULL
,
139 buflen
, filp
->f_pos
);
141 goto unlock_and_exit
;
146 while (rdir
->head
< rdir
->tail
) {
148 err
= p9stat_read(rdir
->buf
+ rdir
->head
,
149 rdir
->tail
- rdir
->head
, &st
,
150 fid
->clnt
->proto_version
);
152 P9_DPRINTK(P9_DEBUG_VFS
, "returned %d\n", err
);
155 goto unlock_and_exit
;
159 over
= filldir(dirent
, st
.name
, strlen(st
.name
),
160 filp
->f_pos
, v9fs_qid2ino(&st
.qid
), dt_type(&st
));
166 goto unlock_and_exit
;
168 rdir
->head
+= reclen
;
169 filp
->f_pos
+= reclen
;
174 mutex_unlock(&rdir
->mutex
);
181 * v9fs_dir_release - close a directory
182 * @inode: inode of the directory
183 * @filp: file pointer to a directory
187 int v9fs_dir_release(struct inode
*inode
, struct file
*filp
)
191 fid
= filp
->private_data
;
192 P9_DPRINTK(P9_DEBUG_VFS
,
193 "inode: %p filp: %p fid: %d\n", inode
, filp
, fid
->fid
);
194 filemap_write_and_wait(inode
->i_mapping
);
195 p9_client_clunk(fid
);
199 const struct file_operations v9fs_dir_operations
= {
200 .read
= generic_read_dir
,
201 .llseek
= generic_file_llseek
,
202 .readdir
= v9fs_dir_readdir
,
203 .open
= v9fs_file_open
,
204 .release
= v9fs_dir_release
,
207 const struct file_operations v9fs_dir_operations_dotl
= {
208 .read
= generic_read_dir
,
209 .llseek
= generic_file_llseek
,
210 .readdir
= v9fs_dir_readdir
,
211 .open
= v9fs_file_open
,
212 .release
= v9fs_dir_release
,