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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_wstat *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 | * @filp: 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_wstat st; |
73 | int err; |
74 | struct p9_fid *fid; |
75 | int buflen; |
76 | char *statbuf; |
77 | int n, i = 0; |
78 | |
79 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name); |
80 | fid = filp->private_data; |
81 | |
82 | buflen = fid->clnt->msize - P9_IOHDRSZ; |
83 | statbuf = kmalloc(buflen, GFP_KERNEL); |
84 | if (!statbuf) |
85 | return -ENOMEM; |
86 | |
87 | while (1) { |
88 | err = v9fs_file_readn(filp, statbuf, NULL, buflen, |
89 | fid->rdir_fpos); |
90 | if (err <= 0) |
91 | break; |
92 | |
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; |
102 | } |
103 | |
104 | i += st.size+2; |
105 | fid->rdir_fpos += st.size+2; |
106 | |
107 | over = filldir(dirent, st.name, strlen(st.name), |
108 | filp->f_pos, v9fs_qid2ino(&st.qid), dt_type(&st)); |
109 | |
110 | filp->f_pos += st.size+2; |
111 | |
112 | p9stat_free(&st); |
113 | |
114 | if (over) { |
115 | err = 0; |
116 | goto free_and_exit; |
117 | } |
118 | } |
119 | } |
120 | |
121 | free_and_exit: |
122 | kfree(statbuf); |
123 | return err; |
124 | } |
125 | |
126 | |
127 | /** |
128 | * v9fs_dir_release - close a directory |
129 | * @inode: inode of the directory |
130 | * @filp: file pointer to a directory |
131 | * |
132 | */ |
133 | |
134 | int v9fs_dir_release(struct inode *inode, struct file *filp) |
135 | { |
136 | struct p9_fid *fid; |
137 | |
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; |
144 | } |
145 | |
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, |
152 | }; |
153 |
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od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9