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 */
20 MODULE_DESCRIPTION("CAPI4Linux: /dev/capi/ filesystem");
21 MODULE_AUTHOR("Carsten Paeth");
22 MODULE_LICENSE("GPL");
24 /* ------------------------------------------------------------------ */
26 static char *revision
= "$Revision: 1.1.2.3 $";
28 /* ------------------------------------------------------------------ */
30 #define CAPIFS_SUPER_MAGIC (('C'<<8)|'N')
32 static struct vfsmount
*capifs_mnt
;
33 static struct dentry
*capifs_root
;
41 } config
= {.mode
= 0600};
43 /* ------------------------------------------------------------------ */
45 static int capifs_remount(struct super_block
*s
, int *flags
, char *data
)
55 while ((this_char
= strsep(&data
, ",")) != NULL
) {
60 if (sscanf(this_char
, "uid=%i%c", &n
, &dummy
) == 1) {
63 } else if (sscanf(this_char
, "gid=%i%c", &n
, &dummy
) == 1) {
66 } else if (sscanf(this_char
, "mode=%o%c", &n
, &dummy
) == 1)
69 printk("capifs: called with bogus options\n");
73 config
.setuid
= setuid
;
74 config
.setgid
= setgid
;
81 static struct super_operations capifs_sops
=
83 .statfs
= simple_statfs
,
84 .remount_fs
= capifs_remount
,
89 capifs_fill_super(struct super_block
*s
, void *data
, int silent
)
93 s
->s_blocksize
= 1024;
94 s
->s_blocksize_bits
= 10;
95 s
->s_magic
= CAPIFS_SUPER_MAGIC
;
96 s
->s_op
= &capifs_sops
;
103 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
105 inode
->i_blksize
= 1024;
106 inode
->i_uid
= inode
->i_gid
= 0;
107 inode
->i_mode
= S_IFDIR
| S_IRUGO
| S_IXUGO
| S_IWUSR
;
108 inode
->i_op
= &simple_dir_inode_operations
;
109 inode
->i_fop
= &simple_dir_operations
;
112 capifs_root
= s
->s_root
= d_alloc_root(inode
);
116 printk("capifs: get root dentry failed\n");
122 static struct super_block
*capifs_get_sb(struct file_system_type
*fs_type
,
123 int flags
, const char *dev_name
, void *data
)
125 return get_sb_single(fs_type
, flags
, data
, capifs_fill_super
);
128 static struct file_system_type capifs_fs_type
= {
129 .owner
= THIS_MODULE
,
131 .get_sb
= capifs_get_sb
,
132 .kill_sb
= kill_anon_super
,
135 static struct dentry
*get_node(int num
)
138 struct dentry
*root
= capifs_root
;
139 down(&root
->d_inode
->i_sem
);
140 return lookup_one_len(s
, root
, sprintf(s
, "%d", num
));
143 void capifs_new_ncci(unsigned int number
, dev_t device
)
145 struct dentry
*dentry
;
146 struct inode
*inode
= new_inode(capifs_mnt
->mnt_sb
);
149 inode
->i_ino
= number
+2;
150 inode
->i_blksize
= 1024;
151 inode
->i_uid
= config
.setuid
? config
.uid
: current
->fsuid
;
152 inode
->i_gid
= config
.setgid
? config
.gid
: current
->fsgid
;
153 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
154 init_special_inode(inode
, S_IFCHR
|config
.mode
, device
);
155 //inode->i_op = &capifs_file_inode_operations;
157 dentry
= get_node(number
);
158 if (!IS_ERR(dentry
) && !dentry
->d_inode
)
159 d_instantiate(dentry
, inode
);
160 up(&capifs_root
->d_inode
->i_sem
);
163 void capifs_free_ncci(unsigned int number
)
165 struct dentry
*dentry
= get_node(number
);
167 if (!IS_ERR(dentry
)) {
168 struct inode
*inode
= dentry
->d_inode
;
176 up(&capifs_root
->d_inode
->i_sem
);
179 static int __init
capifs_init(void)
185 if ((p
= strchr(revision
, ':')) != 0 && p
[1]) {
186 strlcpy(rev
, p
+ 2, sizeof(rev
));
187 if ((p
= strchr(rev
, '$')) != 0 && p
> rev
)
192 err
= register_filesystem(&capifs_fs_type
);
194 capifs_mnt
= kern_mount(&capifs_fs_type
);
195 if (IS_ERR(capifs_mnt
)) {
196 err
= PTR_ERR(capifs_mnt
);
197 unregister_filesystem(&capifs_fs_type
);
201 printk(KERN_NOTICE
"capifs: Rev %s\n", rev
);
205 static void __exit
capifs_exit(void)
207 unregister_filesystem(&capifs_fs_type
);
211 EXPORT_SYMBOL(capifs_new_ncci
);
212 EXPORT_SYMBOL(capifs_free_ncci
);
214 module_init(capifs_init
);
215 module_exit(capifs_exit
);