module: add MODULE_STATE_LIVE notify
[linux-2.6/mini2440.git] / fs / 9p / vfs_dir.c
blob873cd31baa47c6c77022918665a5f343d93f8425
1 /*
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>
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>
38 #include "v9fs.h"
39 #include "v9fs_vfs.h"
40 #include "fid.h"
42 /**
43 * dt_type - return file type
44 * @mistat: mistat structure
48 static inline int dt_type(struct p9_wstat *mistat)
50 unsigned long perm = mistat->mode;
51 int rettype = DT_REG;
53 if (perm & P9_DMDIR)
54 rettype = DT_DIR;
55 if (perm & P9_DMSYMLINK)
56 rettype = DT_LNK;
58 return rettype;
61 /**
62 * v9fs_dir_readdir - read a directory
63 * @filp: opened file structure
64 * @dirent: directory structure ???
65 * @filldir: function to populate directory structure ???
69 static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
71 int over;
72 struct p9_wstat st;
73 int err;
74 struct p9_fid *fid;
75 int buflen;
76 char *statbuf;
77 int n, i = 0;
79 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
80 fid = filp->private_data;
82 buflen = fid->clnt->msize - P9_IOHDRSZ;
83 statbuf = kmalloc(buflen, GFP_KERNEL);
84 if (!statbuf)
85 return -ENOMEM;
87 while (1) {
88 err = v9fs_file_readn(filp, statbuf, NULL, buflen,
89 fid->rdir_fpos);
90 if (err <= 0)
91 break;
93 n = err;
94 while (i < n) {
95 err = p9stat_read(statbuf + i, buflen-i, &st,
96 fid->clnt->dotu);
97 if (err) {
98 P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
99 err = -EIO;
100 p9stat_free(&st);
101 goto free_and_exit;
104 i += st.size+2;
105 fid->rdir_fpos += st.size+2;
107 over = filldir(dirent, st.name, strlen(st.name),
108 filp->f_pos, v9fs_qid2ino(&st.qid), dt_type(&st));
110 filp->f_pos += st.size+2;
112 p9stat_free(&st);
114 if (over) {
115 err = 0;
116 goto free_and_exit;
121 free_and_exit:
122 kfree(statbuf);
123 return err;
128 * v9fs_dir_release - close a directory
129 * @inode: inode of the directory
130 * @filp: file pointer to a directory
134 int v9fs_dir_release(struct inode *inode, struct file *filp)
136 struct p9_fid *fid;
138 fid = filp->private_data;
139 P9_DPRINTK(P9_DEBUG_VFS,
140 "inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
141 filemap_write_and_wait(inode->i_mapping);
142 p9_client_clunk(fid);
143 return 0;
146 const struct file_operations v9fs_dir_operations = {
147 .read = generic_read_dir,
148 .llseek = generic_file_llseek,
149 .readdir = v9fs_dir_readdir,
150 .open = v9fs_file_open,
151 .release = v9fs_dir_release,