1 /* $Id: capifs.c,v 1.1.2.3 2004/01/16 21:09:26 keil Exp $
3 * Copyright 2000 by Carsten Paeth <calle@calle.de>
5 * Heavily based on devpts filesystem from H. Peter Anvin
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
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 #include <linux/sched.h> /* current */
22 MODULE_DESCRIPTION("CAPI4Linux: /dev/capi/ filesystem");
23 MODULE_AUTHOR("Carsten Paeth");
24 MODULE_LICENSE("GPL");
26 /* ------------------------------------------------------------------ */
28 static char *revision = "$Revision: 1.1.2.3 $";
30 /* ------------------------------------------------------------------ */
32 #define CAPIFS_SUPER_MAGIC (('C'<<8)|'N')
34 static struct vfsmount *capifs_mnt;
35 static struct dentry *capifs_root;
43 } config = {.mode = 0600};
45 /* ------------------------------------------------------------------ */
47 static int capifs_remount(struct super_block *s, int *flags, char *data)
55 char *new_opt = kstrdup(data, GFP_KERNEL);
58 while ((this_char = strsep(&data, ",")) != NULL) {
63 if (sscanf(this_char, "uid=%i%c", &n, &dummy) == 1) {
66 } else if (sscanf(this_char, "gid=%i%c", &n, &dummy) == 1) {
69 } else if (sscanf(this_char, "mode=%o%c", &n, &dummy) == 1)
73 printk("capifs: called with bogus options\n");
79 s->s_options = new_opt;
81 config.setuid = setuid;
82 config.setgid = setgid;
90 static struct super_operations capifs_sops =
92 .statfs = simple_statfs,
93 .remount_fs = capifs_remount,
94 .show_options = generic_show_options,
99 capifs_fill_super(struct super_block *s, void *data, int silent)
101 struct inode * inode;
103 s->s_blocksize = 1024;
104 s->s_blocksize_bits = 10;
105 s->s_magic = CAPIFS_SUPER_MAGIC;
106 s->s_op = &capifs_sops;
109 inode = new_inode(s);
113 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
115 inode->i_uid = inode->i_gid = 0;
116 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
117 inode->i_op = &simple_dir_inode_operations;
118 inode->i_fop = &simple_dir_operations;
121 capifs_root = s->s_root = d_alloc_root(inode);
125 printk("capifs: get root dentry failed\n");
131 static int capifs_get_sb(struct file_system_type *fs_type,
132 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
134 return get_sb_single(fs_type, flags, data, capifs_fill_super, mnt);
137 static struct file_system_type capifs_fs_type = {
138 .owner = THIS_MODULE,
140 .get_sb = capifs_get_sb,
141 .kill_sb = kill_anon_super,
144 static struct dentry *get_node(int num)
147 struct dentry *root = capifs_root;
148 mutex_lock(&root->d_inode->i_mutex);
149 return lookup_one_len(s, root, sprintf(s, "%d", num));
152 void capifs_new_ncci(unsigned int number, dev_t device)
154 struct dentry *dentry;
155 struct inode *inode = new_inode(capifs_mnt->mnt_sb);
158 inode->i_ino = number+2;
159 inode->i_uid = config.setuid ? config.uid : current->fsuid;
160 inode->i_gid = config.setgid ? config.gid : current->fsgid;
161 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
162 init_special_inode(inode, S_IFCHR|config.mode, device);
163 //inode->i_op = &capifs_file_inode_operations;
165 dentry = get_node(number);
166 if (!IS_ERR(dentry) && !dentry->d_inode)
167 d_instantiate(dentry, inode);
168 mutex_unlock(&capifs_root->d_inode->i_mutex);
171 void capifs_free_ncci(unsigned int number)
173 struct dentry *dentry = get_node(number);
175 if (!IS_ERR(dentry)) {
176 struct inode *inode = dentry->d_inode;
184 mutex_unlock(&capifs_root->d_inode->i_mutex);
187 static int __init capifs_init(void)
193 if ((p = strchr(revision, ':')) != NULL && p[1]) {
194 strlcpy(rev, p + 2, sizeof(rev));
195 if ((p = strchr(rev, '$')) != NULL && p > rev)
200 err = register_filesystem(&capifs_fs_type);
202 capifs_mnt = kern_mount(&capifs_fs_type);
203 if (IS_ERR(capifs_mnt)) {
204 err = PTR_ERR(capifs_mnt);
205 unregister_filesystem(&capifs_fs_type);
209 printk(KERN_NOTICE "capifs: Rev %s\n", rev);
213 static void __exit capifs_exit(void)
215 unregister_filesystem(&capifs_fs_type);
219 EXPORT_SYMBOL(capifs_new_ncci);
220 EXPORT_SYMBOL(capifs_free_ncci);
222 module_init(capifs_init);
223 module_exit(capifs_exit);