Commit | Line | Data |
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e69e7fe5 EVH |
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 | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
e69e7fe5 EVH |
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> | |
914e2637 | 32 | #include <linux/sched.h> |
e69e7fe5 EVH |
33 | #include <linux/inet.h> |
34 | #include <linux/idr.h> | |
bd238fb4 LI |
35 | #include <net/9p/9p.h> |
36 | #include <net/9p/client.h> | |
e69e7fe5 | 37 | |
e69e7fe5 | 38 | #include "v9fs.h" |
531b1094 | 39 | #include "v9fs_vfs.h" |
e69e7fe5 EVH |
40 | #include "fid.h" |
41 | ||
42 | /** | |
43 | * dt_type - return file type | |
44 | * @mistat: mistat structure | |
45 | * | |
46 | */ | |
47 | ||
02da398b | 48 | static inline int dt_type(struct p9_wstat *mistat) |
e69e7fe5 EVH |
49 | { |
50 | unsigned long perm = mistat->mode; | |
51 | int rettype = DT_REG; | |
52 | ||
bd238fb4 | 53 | if (perm & P9_DMDIR) |
e69e7fe5 | 54 | rettype = DT_DIR; |
bd238fb4 | 55 | if (perm & P9_DMSYMLINK) |
e69e7fe5 EVH |
56 | rettype = DT_LNK; |
57 | ||
58 | return rettype; | |
59 | } | |
60 | ||
61 | /** | |
62 | * v9fs_dir_readdir - read a directory | |
ee443996 | 63 | * @filp: opened file structure |
e69e7fe5 EVH |
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 | { | |
bd238fb4 | 71 | int over; |
02da398b | 72 | struct p9_wstat st; |
06b55b46 | 73 | int err; |
bd238fb4 | 74 | struct p9_fid *fid; |
06b55b46 EVH |
75 | int buflen; |
76 | char *statbuf; | |
77 | int n, i = 0; | |
bd238fb4 LI |
78 | |
79 | P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name); | |
bd238fb4 | 80 | fid = filp->private_data; |
bd238fb4 | 81 | |
06b55b46 EVH |
82 | buflen = fid->clnt->msize - P9_IOHDRSZ; |
83 | statbuf = kmalloc(buflen, GFP_KERNEL); | |
84 | if (!statbuf) | |
85 | return -ENOMEM; | |
bd238fb4 | 86 | |
06b55b46 | 87 | while (1) { |
51a87c55 EVH |
88 | err = v9fs_file_readn(filp, statbuf, NULL, buflen, |
89 | fid->rdir_fpos); | |
06b55b46 | 90 | if (err <= 0) |
e69e7fe5 EVH |
91 | break; |
92 | ||
06b55b46 EVH |
93 | n = err; |
94 | while (i < n) { | |
02da398b | 95 | err = p9stat_read(statbuf + i, buflen-i, &st, |
06b55b46 | 96 | fid->clnt->dotu); |
02da398b EVH |
97 | if (err) { |
98 | P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err); | |
06b55b46 | 99 | err = -EIO; |
02da398b | 100 | p9stat_free(&st); |
06b55b46 EVH |
101 | goto free_and_exit; |
102 | } | |
103 | ||
02da398b EVH |
104 | i += st.size+2; |
105 | fid->rdir_fpos += st.size+2; | |
06b55b46 | 106 | |
02da398b | 107 | over = filldir(dirent, st.name, strlen(st.name), |
06b55b46 EVH |
108 | filp->f_pos, v9fs_qid2ino(&st.qid), dt_type(&st)); |
109 | ||
02da398b EVH |
110 | filp->f_pos += st.size+2; |
111 | ||
112 | p9stat_free(&st); | |
06b55b46 EVH |
113 | |
114 | if (over) { | |
115 | err = 0; | |
116 | goto free_and_exit; | |
117 | } | |
118 | } | |
e69e7fe5 EVH |
119 | } |
120 | ||
06b55b46 EVH |
121 | free_and_exit: |
122 | kfree(statbuf); | |
123 | return err; | |
e69e7fe5 EVH |
124 | } |
125 | ||
bd238fb4 | 126 | |
e69e7fe5 EVH |
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 | { | |
bd238fb4 | 136 | struct p9_fid *fid; |
e69e7fe5 | 137 | |
bd238fb4 LI |
138 | fid = filp->private_data; |
139 | P9_DPRINTK(P9_DEBUG_VFS, | |
140 | "inode: %p filp: %p fid: %d\n", inode, filp, fid->fid); | |
28fd1298 | 141 | filemap_write_and_wait(inode->i_mapping); |
bd238fb4 | 142 | p9_client_clunk(fid); |
e69e7fe5 EVH |
143 | return 0; |
144 | } | |
145 | ||
4b6f5d20 | 146 | const struct file_operations v9fs_dir_operations = { |
e69e7fe5 | 147 | .read = generic_read_dir, |
59af1584 | 148 | .llseek = generic_file_llseek, |
e69e7fe5 EVH |
149 | .readdir = v9fs_dir_readdir, |
150 | .open = v9fs_file_open, | |
151 | .release = v9fs_dir_release, | |
152 | }; |