-
Notifications
You must be signed in to change notification settings - Fork 2
/
cmsfsmnt.c
308 lines (254 loc) · 8.1 KB
/
cmsfsmnt.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
/*
*
* Name: cmsfsvfs.c (C source)
* Date: 2000-Sep-14 (Thu)
* split from other CMS FS components
*
* This source contains the routines and structures
* required when CMS FS is built as a driver.
* It interfaces between CMS FS' own structures,
* which read the CMS EDF format, and Linux VFS.
*/
#define __KERNEL__
#define MODULE
#include <linux/module.h>
#include <linux/version.h>
/* #include <linux/types.h> */
#include <linux/fs.h>
#include <linux/mm.h>
#include "cmsfs.h"
/* #include "aecs.h" */
#include "cmsfsany.c"
/* I learned of this requirement from Neale's "cpint" code. */
char kernel_version [] = UTS_RELEASE;
/* -------------------------------------------------------- CMSFS_KERNEL
* routines required when CMS FS is built as a driver
*
* CMS FS inode numbers are base-zero index into the directory.
* CMS FS (EDF) is flat, no sub-directories, so there is
* only one such directory into which we index.
*/
void cmsfs_read_inode(struct inode * in)
{
(void) printk("CMSFS: cmsfs_read_inode()\n");
return;
}
void cmsfs_put_super(struct super_block * sb)
{
(void) printk("CMSFS: cmsfs_put_super()\n");
return;
}
int cmsfs_statfs(struct super_block * sb,struct statfs *st,int stl)
{
/* EXT2 allocates a temporary statfs structure
and then copies the contents, limitting at stl */
(void) printk("CMSFS: cmsfs_statfs()\n");
/*
st->f_bsize = cmssuper->blksz;
st->f_blocks = cmssuper->blocks;
st->f_bfree = cmssuper->bkfree;
st->f_bavail = cmssuper->bkfree;
st->f_files = cmssuper->files;
st->f_ffree = cmssuper->ffree;
*/
return 0;
}
static
struct super_operations cmsfs_operations = {
cmsfs_read_inode,
NULL, /* cmsfs_write_inode, */
NULL, /* cmsfs_put_inode, */
NULL, /* cmsfs_delete_inode, */
NULL, /* cmsfs_notify_change, */
cmsfs_put_super,
NULL, /* cmsfs_write_super, */
cmsfs_statfs,
NULL, /* cmsfs_remount, */
NULL, /* cmsfs_clear_inode, */
NULL /* cmsfs_umount */
};
/* mimic ISO, which is also read-only media */
/* mimic MS-DOS, which has similar short names (8x3) */
/* --------------------------------------------------------- CMSFS_MOUNT
*/
struct super_block *
cmsfs_mount(struct super_block * sb, void * data, int silent)
{
struct buffer_head * bh;
struct CMSVOLID *cmssuper;
/* the kernel has supplied us with a virgin superblock */
(void) printk("CMSFS: cmsfs_mount()\n");
/* let the kernel know we're busy ... for the moment */
MOD_INC_USE_COUNT;
/* (void) lock_super(sb); */
(void) printk("CMSFS: sb=%08X, data=%08X, silent=%d\n",sb,data,silent);
(void) printk("CMSFS: s_dev=%s\n",kdevname(sb->s_dev));
(void) printk("CMSFS: blocksize=%d\n",get_hardblocksize(sb->s_dev));
(void) printk("CMSFS: s_dev=%s (%04X)\n",kdevname(sb->s_dev),sb->s_dev);
(void) printk("CMSFS: s_blocksize=%d\n",sb->s_blocksize);
(void) printk("CMSFS: s_type=%s\n",sb->s_type);
(void) printk("CMSFS: s_root=%08X\n",sb->s_root);
(void) printk("CMSFS: s_op=%08X\n",sb->s_op);
/*
sb->s_type =
*/
/* careful! this is not cleared before we get called */
sb->s_op = &cmsfs_operations;
(void) printk("CMSFS: s_op=%08X (after)\n",sb->s_op);
sb->s_blocksize = get_hardblocksize(sb->s_dev);
(void) printk("CMSFS: s_blocksize=%d (after)\n",sb->s_blocksize);
/* -------------------------------------------------------------- *
* Map the CMS volume (ADT) ... *
* -------------------------------------------------------------- */
cmssuper = (void*) kmalloc(sizeof(struct CMSVOLID), GFP_KERNEL);
if (cmssuper == NULL)
{
(void) printk ("CMSFS: cannot allocate CMS superblock!\n");
sb->s_dev = 0; /* why? */
/* (void) unlock_super (sb); */
MOD_DEC_USE_COUNT;
return NULL;
}
sb->u.generic_sbp = cmssuper;
/* -------------------------------------------------------------- *
* Map the CMS directory (FST) ... *
* -------------------------------------------------------------- */
/* -------------------------------------------------------------- *
* Allocate and flesh-out an inode for the directory. *
* This will be called "root" for this filesystem, *
* even though there will be no other directories. *
* -------------------------------------------------------------- */
/*
root_inode = iget(s, MINIX_ROOT_INO);
if (!root_inode)
{
(void) printk ("CMSFS: cannot get root inode!\n");
kfree(sb->u.generic_sbp);
sb->s_dev = 0;
(void) unlock_super (sb);
(void) brelse(bh);
MOD_DEC_USE_COUNT;
return NULL;
}
s->s_root = d_alloc_root(root_inode, NULL);
if (!s->s_root)
goto out_iput;
s->s_root->d_op = &minix_dentry_operations;
*/
/*
->vfsinode = iget(sb,0); ** or get_empty_inode()? **
sb->s_root = d_alloc_root(->vfsinode,NULL);
*/
sb->s_root = NULL;
/*
if (!sb->s_root)
{
(void) printk ("CMSFS: cannot read directory!\n");
kfree(sb->u.generic_sbp);
sb->s_dev = 0;
(void) unlock_super (sb);
(void) brelse(bh);
MOD_DEC_USE_COUNT;
return NULL;
}
*/
/*
sb->s_root->i_sb = sb;
sb->s_root->i_dev = sb->s_dev;
*/
/*
root_inode->i_ino = MSDOS_ROOT_INO;
*/
/*
sb->s_root->i_mtime =
sb->s_root->i_atime =
sb->s_root->i_ctime = 0;
*/
/* the volume also has a time stamp, just FYI */
/*
sb->s_root->i_nlink = 2;
*/
/*
sb->s_root->i_op =
*/
/* inode operations for the directory */
return sb;
/* kfree(sb->u.generic_sbp); */
/* (void) unlock_super (sb); */
/* (void) brelse(bh); memory leak here */
/* MOD_DEC_USE_COUNT; */
/* return NULL; */
}
/* ------------------------------------------------------------------ */
static
struct file_system_type cms_fs_type = {
"cms",
FS_REQUIRES_DEV | FS_NO_DCACHE,
cmsfs_mount,
NULL
};
/* ---------------------------------------------------------- CMSFS_INIT
* filesystem init, especially useful for module init
*/
int cmsfs_init()
{
(void) printk("CMSFS: cmsfs_init()\n");
#ifdef CONFIG_PROC_FS
rpc_register_sysctl();
rpc_proc_init();
/*
rpc_proc_register(&cmsfs_rpcstat);
*/
#endif
return register_filesystem(&cms_fs_type);
}
/* ------------------------------------------------------- CMSFS_CLEANUP
* filesystem cleanup & shut down for module extraction
*/
void cmsfs_cleanup()
{
(void) printk("CMSFS: cmsfs_cleanup()\n");
#ifdef CONFIG_PROC_FS
rpc_proc_unregister("cms");
#endif
unregister_filesystem(&cms_fs_type);
}
/* -------------------------------------------------------- CMSFS_MODULE
* additional routines required when CMS FS is built as a module
*/
#ifdef MODULE
MODULE_AUTHOR(CMSFS_AUTHOR);
MODULE_DESCRIPTION(CMSFS_DESCRIPTION);
/*
MODULE_SUPPORTED_DEVICE(name)
MODULE_PARM(var,type)
MODULE_PARM_DESC(var,desc)
*/
EXPORT_NO_SYMBOLS;
int init_module() { return cmsfs_init(); }
void cleanup_module() { cmsfs_cleanup(); }
/* {
module.name = "cmsfs";
module.init = &cmsfs_init();
module.cleanup = &cmsfs_cleanup();
} */
#endif /* MODULE */
/* --------------------------------------------------------- CMSFS_BREAD
* The "b" here means "block", not "buffer". Do not confuse this with
* Linux VFS bread() function. This is CMS FS "block read" function.
*/
int cmsfs_bread(struct CMSVOLID *vol,void *buf,int block,int blocksize)
{
struct buffer_head * bh;
struct super_block * sb;
(void) printk("CMSFS: cmsfs_bread(-,%d,%d)\n",block,blocksize);
sb = (struct super_block *) vol->vfssuper;
bh = bread(sb->s_dev,block,blocksize);
if (bh == NULL) return -1;
/*
(void) memcpy(buf,bh->b_data,blocksize);
*/
(void) memmove(buf,bh->b_data,blocksize);
/* (void) brelse(bh); memory leak here */
return blocksize;
}