diff options
Diffstat (limited to 'drivers/isdn/capi/capifs.c')
-rw-r--r-- | drivers/isdn/capi/capifs.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/drivers/isdn/capi/capifs.c b/drivers/isdn/capi/capifs.c new file mode 100644 index 000000000000..f8570fd9d2ab --- /dev/null +++ b/drivers/isdn/capi/capifs.c | |||
@@ -0,0 +1,212 @@ | |||
1 | /* $Id: capifs.c,v 1.1.2.3 2004/01/16 21:09:26 keil Exp $ | ||
2 | * | ||
3 | * Copyright 2000 by Carsten Paeth <calle@calle.de> | ||
4 | * | ||
5 | * Heavily based on devpts filesystem from H. Peter Anvin | ||
6 | * | ||
7 | * This software may be used and distributed according to the terms | ||
8 | * of the GNU General Public License, incorporated herein by reference. | ||
9 | * | ||
10 | */ | ||
11 | |||
12 | #include <linux/fs.h> | ||
13 | #include <linux/mount.h> | ||
14 | #include <linux/namei.h> | ||
15 | #include <linux/module.h> | ||
16 | #include <linux/init.h> | ||
17 | #include <linux/ctype.h> | ||
18 | |||
19 | MODULE_DESCRIPTION("CAPI4Linux: /dev/capi/ filesystem"); | ||
20 | MODULE_AUTHOR("Carsten Paeth"); | ||
21 | MODULE_LICENSE("GPL"); | ||
22 | |||
23 | /* ------------------------------------------------------------------ */ | ||
24 | |||
25 | static char *revision = "$Revision: 1.1.2.3 $"; | ||
26 | |||
27 | /* ------------------------------------------------------------------ */ | ||
28 | |||
29 | #define CAPIFS_SUPER_MAGIC (('C'<<8)|'N') | ||
30 | |||
31 | static struct vfsmount *capifs_mnt; | ||
32 | static struct dentry *capifs_root; | ||
33 | |||
34 | static struct { | ||
35 | int setuid; | ||
36 | int setgid; | ||
37 | uid_t uid; | ||
38 | gid_t gid; | ||
39 | umode_t mode; | ||
40 | } config = {.mode = 0600}; | ||
41 | |||
42 | /* ------------------------------------------------------------------ */ | ||
43 | |||
44 | static int capifs_remount(struct super_block *s, int *flags, char *data) | ||
45 | { | ||
46 | int setuid = 0; | ||
47 | int setgid = 0; | ||
48 | uid_t uid = 0; | ||
49 | gid_t gid = 0; | ||
50 | umode_t mode = 0600; | ||
51 | char *this_char; | ||
52 | |||
53 | this_char = NULL; | ||
54 | while ((this_char = strsep(&data, ",")) != NULL) { | ||
55 | int n; | ||
56 | char dummy; | ||
57 | if (!*this_char) | ||
58 | continue; | ||
59 | if (sscanf(this_char, "uid=%i%c", &n, &dummy) == 1) { | ||
60 | setuid = 1; | ||
61 | uid = n; | ||
62 | } else if (sscanf(this_char, "gid=%i%c", &n, &dummy) == 1) { | ||
63 | setgid = 1; | ||
64 | gid = n; | ||
65 | } else if (sscanf(this_char, "mode=%o%c", &n, &dummy) == 1) | ||
66 | mode = n & ~S_IFMT; | ||
67 | else { | ||
68 | printk("capifs: called with bogus options\n"); | ||
69 | return -EINVAL; | ||
70 | } | ||
71 | } | ||
72 | config.setuid = setuid; | ||
73 | config.setgid = setgid; | ||
74 | config.uid = uid; | ||
75 | config.gid = gid; | ||
76 | config.mode = mode; | ||
77 | return 0; | ||
78 | } | ||
79 | |||
80 | static struct super_operations capifs_sops = | ||
81 | { | ||
82 | .statfs = simple_statfs, | ||
83 | .remount_fs = capifs_remount, | ||
84 | }; | ||
85 | |||
86 | |||
87 | static int | ||
88 | capifs_fill_super(struct super_block *s, void *data, int silent) | ||
89 | { | ||
90 | struct inode * inode; | ||
91 | |||
92 | s->s_blocksize = 1024; | ||
93 | s->s_blocksize_bits = 10; | ||
94 | s->s_magic = CAPIFS_SUPER_MAGIC; | ||
95 | s->s_op = &capifs_sops; | ||
96 | s->s_time_gran = 1; | ||
97 | |||
98 | inode = new_inode(s); | ||
99 | if (!inode) | ||
100 | goto fail; | ||
101 | inode->i_ino = 1; | ||
102 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | ||
103 | inode->i_blocks = 0; | ||
104 | inode->i_blksize = 1024; | ||
105 | inode->i_uid = inode->i_gid = 0; | ||
106 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR; | ||
107 | inode->i_op = &simple_dir_inode_operations; | ||
108 | inode->i_fop = &simple_dir_operations; | ||
109 | inode->i_nlink = 2; | ||
110 | |||
111 | capifs_root = s->s_root = d_alloc_root(inode); | ||
112 | if (s->s_root) | ||
113 | return 0; | ||
114 | |||
115 | printk("capifs: get root dentry failed\n"); | ||
116 | iput(inode); | ||
117 | fail: | ||
118 | return -ENOMEM; | ||
119 | } | ||
120 | |||
121 | static struct super_block *capifs_get_sb(struct file_system_type *fs_type, | ||
122 | int flags, const char *dev_name, void *data) | ||
123 | { | ||
124 | return get_sb_single(fs_type, flags, data, capifs_fill_super); | ||
125 | } | ||
126 | |||
127 | static struct file_system_type capifs_fs_type = { | ||
128 | .owner = THIS_MODULE, | ||
129 | .name = "capifs", | ||
130 | .get_sb = capifs_get_sb, | ||
131 | .kill_sb = kill_anon_super, | ||
132 | }; | ||
133 | |||
134 | static struct dentry *get_node(int num) | ||
135 | { | ||
136 | char s[10]; | ||
137 | struct dentry *root = capifs_root; | ||
138 | down(&root->d_inode->i_sem); | ||
139 | return lookup_one_len(s, root, sprintf(s, "%d", num)); | ||
140 | } | ||
141 | |||
142 | void capifs_new_ncci(unsigned int number, dev_t device) | ||
143 | { | ||
144 | struct dentry *dentry; | ||
145 | struct inode *inode = new_inode(capifs_mnt->mnt_sb); | ||
146 | if (!inode) | ||
147 | return; | ||
148 | inode->i_ino = number+2; | ||
149 | inode->i_blksize = 1024; | ||
150 | inode->i_uid = config.setuid ? config.uid : current->fsuid; | ||
151 | inode->i_gid = config.setgid ? config.gid : current->fsgid; | ||
152 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | ||
153 | init_special_inode(inode, S_IFCHR|config.mode, device); | ||
154 | //inode->i_op = &capifs_file_inode_operations; | ||
155 | |||
156 | dentry = get_node(number); | ||
157 | if (!IS_ERR(dentry) && !dentry->d_inode) | ||
158 | d_instantiate(dentry, inode); | ||
159 | up(&capifs_root->d_inode->i_sem); | ||
160 | } | ||
161 | |||
162 | void capifs_free_ncci(unsigned int number) | ||
163 | { | ||
164 | struct dentry *dentry = get_node(number); | ||
165 | |||
166 | if (!IS_ERR(dentry)) { | ||
167 | struct inode *inode = dentry->d_inode; | ||
168 | if (inode) { | ||
169 | inode->i_nlink--; | ||
170 | d_delete(dentry); | ||
171 | dput(dentry); | ||
172 | } | ||
173 | dput(dentry); | ||
174 | } | ||
175 | up(&capifs_root->d_inode->i_sem); | ||
176 | } | ||
177 | |||
178 | static int __init capifs_init(void) | ||
179 | { | ||
180 | char rev[32]; | ||
181 | char *p; | ||
182 | int err; | ||
183 | |||
184 | if ((p = strchr(revision, ':')) != 0 && p[1]) { | ||
185 | strlcpy(rev, p + 2, sizeof(rev)); | ||
186 | if ((p = strchr(rev, '$')) != 0 && p > rev) | ||
187 | *(p-1) = 0; | ||
188 | } else | ||
189 | strcpy(rev, "1.0"); | ||
190 | |||
191 | err = register_filesystem(&capifs_fs_type); | ||
192 | if (!err) { | ||
193 | capifs_mnt = kern_mount(&capifs_fs_type); | ||
194 | if (IS_ERR(capifs_mnt)) | ||
195 | err = PTR_ERR(capifs_mnt); | ||
196 | } | ||
197 | if (!err) | ||
198 | printk(KERN_NOTICE "capifs: Rev %s\n", rev); | ||
199 | return err; | ||
200 | } | ||
201 | |||
202 | static void __exit capifs_exit(void) | ||
203 | { | ||
204 | unregister_filesystem(&capifs_fs_type); | ||
205 | mntput(capifs_mnt); | ||
206 | } | ||
207 | |||
208 | EXPORT_SYMBOL(capifs_new_ncci); | ||
209 | EXPORT_SYMBOL(capifs_free_ncci); | ||
210 | |||
211 | module_init(capifs_init); | ||
212 | module_exit(capifs_exit); | ||