1 |
1275 |
phoenix |
/*
|
2 |
|
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* ramdisk.c - Multiple RAM disk driver - gzip-loading version - v. 0.8 beta.
|
3 |
|
|
*
|
4 |
|
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* (C) Chad Page, Theodore Ts'o, et. al, 1995.
|
5 |
|
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*
|
6 |
|
|
* This RAM disk is designed to have filesystems created on it and mounted
|
7 |
|
|
* just like a regular floppy disk.
|
8 |
|
|
*
|
9 |
|
|
* It also does something suggested by Linus: use the buffer cache as the
|
10 |
|
|
* RAM disk data. This makes it possible to dynamically allocate the RAM disk
|
11 |
|
|
* buffer - with some consequences I have to deal with as I write this.
|
12 |
|
|
*
|
13 |
|
|
* This code is based on the original ramdisk.c, written mostly by
|
14 |
|
|
* Theodore Ts'o (TYT) in 1991. The code was largely rewritten by
|
15 |
|
|
* Chad Page to use the buffer cache to store the RAM disk data in
|
16 |
|
|
* 1995; Theodore then took over the driver again, and cleaned it up
|
17 |
|
|
* for inclusion in the mainline kernel.
|
18 |
|
|
*
|
19 |
|
|
* The original CRAMDISK code was written by Richard Lyons, and
|
20 |
|
|
* adapted by Chad Page to use the new RAM disk interface. Theodore
|
21 |
|
|
* Ts'o rewrote it so that both the compressed RAM disk loader and the
|
22 |
|
|
* kernel decompressor uses the same inflate.c codebase. The RAM disk
|
23 |
|
|
* loader now also loads into a dynamic (buffer cache based) RAM disk,
|
24 |
|
|
* not the old static RAM disk. Support for the old static RAM disk has
|
25 |
|
|
* been completely removed.
|
26 |
|
|
*
|
27 |
|
|
* Loadable module support added by Tom Dyas.
|
28 |
|
|
*
|
29 |
|
|
* Further cleanups by Chad Page (page0588@sundance.sjsu.edu):
|
30 |
|
|
* Cosmetic changes in #ifdef MODULE, code movement, etc.
|
31 |
|
|
* When the RAM disk module is removed, free the protected buffers
|
32 |
|
|
* Default RAM disk size changed to 2.88 MB
|
33 |
|
|
*
|
34 |
|
|
* Added initrd: Werner Almesberger & Hans Lermen, Feb '96
|
35 |
|
|
*
|
36 |
|
|
* 4/25/96 : Made RAM disk size a parameter (default is now 4 MB)
|
37 |
|
|
* - Chad Page
|
38 |
|
|
*
|
39 |
|
|
* Add support for fs images split across >1 disk, Paul Gortmaker, Mar '98
|
40 |
|
|
*
|
41 |
|
|
* Make block size and block size shift for RAM disks a global macro
|
42 |
|
|
* and set blk_size for -ENOSPC, Werner Fink <werner@suse.de>, Apr '99
|
43 |
|
|
*/
|
44 |
|
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|
45 |
|
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#include <linux/config.h>
|
46 |
|
|
#include <linux/string.h>
|
47 |
|
|
#include <linux/slab.h>
|
48 |
|
|
#include <linux/module.h>
|
49 |
|
|
#include <linux/init.h>
|
50 |
|
|
#include <linux/devfs_fs_kernel.h>
|
51 |
|
|
#include <linux/smp_lock.h>
|
52 |
|
|
#include <asm/uaccess.h>
|
53 |
|
|
|
54 |
|
|
/*
|
55 |
|
|
* 35 has been officially registered as the RAMDISK major number, but
|
56 |
|
|
* so is the original MAJOR number of 1. We're using 1 in
|
57 |
|
|
* include/linux/major.h for now
|
58 |
|
|
*/
|
59 |
|
|
#define MAJOR_NR RAMDISK_MAJOR
|
60 |
|
|
#include <linux/blk.h>
|
61 |
|
|
#include <linux/blkpg.h>
|
62 |
|
|
|
63 |
|
|
/* The RAM disk size is now a parameter */
|
64 |
|
|
#define NUM_RAMDISKS 16 /* This cannot be overridden (yet) */
|
65 |
|
|
|
66 |
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
67 |
|
|
static int initrd_users;
|
68 |
|
|
unsigned long initrd_start, initrd_end;
|
69 |
|
|
int initrd_below_start_ok;
|
70 |
|
|
#endif
|
71 |
|
|
|
72 |
|
|
/* Various static variables go here. Most are used only in the RAM disk code.
|
73 |
|
|
*/
|
74 |
|
|
|
75 |
|
|
static unsigned long rd_length[NUM_RAMDISKS]; /* Size of RAM disks in bytes */
|
76 |
|
|
static int rd_hardsec[NUM_RAMDISKS]; /* Size of real blocks in bytes */
|
77 |
|
|
static int rd_blocksizes[NUM_RAMDISKS]; /* Size of 1024 byte blocks :) */
|
78 |
|
|
static int rd_kbsize[NUM_RAMDISKS]; /* Size in blocks of 1024 bytes */
|
79 |
|
|
static devfs_handle_t devfs_handle;
|
80 |
|
|
static struct block_device *rd_bdev[NUM_RAMDISKS];/* Protected device data */
|
81 |
|
|
|
82 |
|
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/*
|
83 |
|
|
* Parameters for the boot-loading of the RAM disk. These are set by
|
84 |
|
|
* init/main.c (from arguments to the kernel command line) or from the
|
85 |
|
|
* architecture-specific setup routine (from the stored boot sector
|
86 |
|
|
* information).
|
87 |
|
|
*/
|
88 |
|
|
int rd_size = CONFIG_BLK_DEV_RAM_SIZE; /* Size of the RAM disks */
|
89 |
|
|
/*
|
90 |
|
|
* It would be very desirable to have a soft-blocksize (that in the case
|
91 |
|
|
* of the ramdisk driver is also the hardblocksize ;) of PAGE_SIZE because
|
92 |
|
|
* doing that we'll achieve a far better MM footprint. Using a rd_blocksize of
|
93 |
|
|
* BLOCK_SIZE in the worst case we'll make PAGE_SIZE/BLOCK_SIZE buffer-pages
|
94 |
|
|
* unfreeable. With a rd_blocksize of PAGE_SIZE instead we are sure that only
|
95 |
|
|
* 1 page will be protected. Depending on the size of the ramdisk you
|
96 |
|
|
* may want to change the ramdisk blocksize to achieve a better or worse MM
|
97 |
|
|
* behaviour. The default is still BLOCK_SIZE (needed by rd_load_image that
|
98 |
|
|
* supposes the filesystem in the image uses a BLOCK_SIZE blocksize).
|
99 |
|
|
*/
|
100 |
|
|
int rd_blocksize = BLOCK_SIZE; /* blocksize of the RAM disks */
|
101 |
|
|
|
102 |
|
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/*
|
103 |
|
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* Copyright (C) 2000 Linus Torvalds.
|
104 |
|
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* 2000 Transmeta Corp.
|
105 |
|
|
* aops copied from ramfs.
|
106 |
|
|
*/
|
107 |
|
|
static void ramdisk_updatepage(struct page * page, int need_kmap)
|
108 |
|
|
{
|
109 |
|
|
if (!Page_Uptodate(page)) {
|
110 |
|
|
struct buffer_head *bh = page->buffers;
|
111 |
|
|
void * address;
|
112 |
|
|
|
113 |
|
|
if (need_kmap)
|
114 |
|
|
kmap(page);
|
115 |
|
|
address = page_address(page);
|
116 |
|
|
if (bh) {
|
117 |
|
|
struct buffer_head *tmp = bh;
|
118 |
|
|
do {
|
119 |
|
|
if (!buffer_uptodate(tmp)) {
|
120 |
|
|
memset(address, 0, tmp->b_size);
|
121 |
|
|
mark_buffer_uptodate(tmp, 1);
|
122 |
|
|
}
|
123 |
|
|
address += tmp->b_size;
|
124 |
|
|
tmp = tmp->b_this_page;
|
125 |
|
|
} while (tmp != bh);
|
126 |
|
|
} else
|
127 |
|
|
memset(address, 0, PAGE_CACHE_SIZE);
|
128 |
|
|
if (need_kmap)
|
129 |
|
|
kunmap(page);
|
130 |
|
|
flush_dcache_page(page);
|
131 |
|
|
SetPageUptodate(page);
|
132 |
|
|
}
|
133 |
|
|
}
|
134 |
|
|
|
135 |
|
|
static int ramdisk_readpage(struct file *file, struct page * page)
|
136 |
|
|
{
|
137 |
|
|
ramdisk_updatepage(page, 1);
|
138 |
|
|
UnlockPage(page);
|
139 |
|
|
return 0;
|
140 |
|
|
}
|
141 |
|
|
|
142 |
|
|
static int ramdisk_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
|
143 |
|
|
{
|
144 |
|
|
ramdisk_updatepage(page, 0);
|
145 |
|
|
SetPageDirty(page);
|
146 |
|
|
return 0;
|
147 |
|
|
}
|
148 |
|
|
|
149 |
|
|
static int ramdisk_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
|
150 |
|
|
{
|
151 |
|
|
return 0;
|
152 |
|
|
}
|
153 |
|
|
|
154 |
|
|
static struct address_space_operations ramdisk_aops = {
|
155 |
|
|
readpage: ramdisk_readpage,
|
156 |
|
|
writepage: fail_writepage,
|
157 |
|
|
prepare_write: ramdisk_prepare_write,
|
158 |
|
|
commit_write: ramdisk_commit_write,
|
159 |
|
|
};
|
160 |
|
|
|
161 |
|
|
static int rd_blkdev_pagecache_IO(int rw, struct buffer_head * sbh, int minor)
|
162 |
|
|
{
|
163 |
|
|
struct address_space * mapping;
|
164 |
|
|
unsigned long index;
|
165 |
|
|
int offset, size, err;
|
166 |
|
|
|
167 |
|
|
err = 0;
|
168 |
|
|
mapping = rd_bdev[minor]->bd_inode->i_mapping;
|
169 |
|
|
|
170 |
|
|
/* writing a buffer cache not uptodate must not clear it */
|
171 |
|
|
if (sbh->b_page->mapping == mapping) {
|
172 |
|
|
if (rw == WRITE) {
|
173 |
|
|
mark_buffer_uptodate(sbh, 1);
|
174 |
|
|
SetPageDirty(sbh->b_page);
|
175 |
|
|
}
|
176 |
|
|
goto out;
|
177 |
|
|
}
|
178 |
|
|
|
179 |
|
|
index = sbh->b_rsector >> (PAGE_CACHE_SHIFT - 9);
|
180 |
|
|
offset = (sbh->b_rsector << 9) & ~PAGE_CACHE_MASK;
|
181 |
|
|
size = sbh->b_size;
|
182 |
|
|
|
183 |
|
|
do {
|
184 |
|
|
int count;
|
185 |
|
|
struct page * page;
|
186 |
|
|
char * src, * dst;
|
187 |
|
|
|
188 |
|
|
count = PAGE_CACHE_SIZE - offset;
|
189 |
|
|
if (count > size)
|
190 |
|
|
count = size;
|
191 |
|
|
size -= count;
|
192 |
|
|
|
193 |
|
|
page = grab_cache_page(mapping, index);
|
194 |
|
|
if (!page) {
|
195 |
|
|
err = -ENOMEM;
|
196 |
|
|
goto out;
|
197 |
|
|
}
|
198 |
|
|
|
199 |
|
|
ramdisk_updatepage(page, 1);
|
200 |
|
|
|
201 |
|
|
index++;
|
202 |
|
|
|
203 |
|
|
if (rw == READ) {
|
204 |
|
|
src = kmap(page);
|
205 |
|
|
src += offset;
|
206 |
|
|
dst = bh_kmap(sbh);
|
207 |
|
|
} else {
|
208 |
|
|
dst = kmap(page);
|
209 |
|
|
dst += offset;
|
210 |
|
|
src = bh_kmap(sbh);
|
211 |
|
|
}
|
212 |
|
|
offset = 0;
|
213 |
|
|
|
214 |
|
|
memcpy(dst, src, count);
|
215 |
|
|
|
216 |
|
|
kunmap(page);
|
217 |
|
|
bh_kunmap(sbh);
|
218 |
|
|
|
219 |
|
|
if (rw == READ) {
|
220 |
|
|
flush_dcache_page(sbh->b_page);
|
221 |
|
|
} else {
|
222 |
|
|
SetPageDirty(page);
|
223 |
|
|
}
|
224 |
|
|
UnlockPage(page);
|
225 |
|
|
__free_page(page);
|
226 |
|
|
} while (size);
|
227 |
|
|
|
228 |
|
|
out:
|
229 |
|
|
return err;
|
230 |
|
|
}
|
231 |
|
|
|
232 |
|
|
/*
|
233 |
|
|
* Basically, my strategy here is to set up a buffer-head which can't be
|
234 |
|
|
* deleted, and make that my Ramdisk. If the request is outside of the
|
235 |
|
|
* allocated size, we must get rid of it...
|
236 |
|
|
*
|
237 |
|
|
* 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Added devfs support
|
238 |
|
|
*
|
239 |
|
|
*/
|
240 |
|
|
static int rd_make_request(request_queue_t * q, int rw, struct buffer_head *sbh)
|
241 |
|
|
{
|
242 |
|
|
unsigned int minor;
|
243 |
|
|
unsigned long offset, len;
|
244 |
|
|
|
245 |
|
|
minor = MINOR(sbh->b_rdev);
|
246 |
|
|
|
247 |
|
|
if (minor >= NUM_RAMDISKS)
|
248 |
|
|
goto fail;
|
249 |
|
|
|
250 |
|
|
|
251 |
|
|
offset = sbh->b_rsector << 9;
|
252 |
|
|
len = sbh->b_size;
|
253 |
|
|
|
254 |
|
|
if ((offset + len) > rd_length[minor])
|
255 |
|
|
goto fail;
|
256 |
|
|
|
257 |
|
|
if (rw==READA)
|
258 |
|
|
rw=READ;
|
259 |
|
|
if ((rw != READ) && (rw != WRITE)) {
|
260 |
|
|
printk(KERN_INFO "RAMDISK: bad command: %d\n", rw);
|
261 |
|
|
goto fail;
|
262 |
|
|
}
|
263 |
|
|
|
264 |
|
|
if (rd_blkdev_pagecache_IO(rw, sbh, minor))
|
265 |
|
|
goto fail;
|
266 |
|
|
|
267 |
|
|
sbh->b_end_io(sbh,1);
|
268 |
|
|
return 0;
|
269 |
|
|
fail:
|
270 |
|
|
buffer_IO_error(sbh);
|
271 |
|
|
return 0;
|
272 |
|
|
}
|
273 |
|
|
|
274 |
|
|
static int rd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
|
275 |
|
|
{
|
276 |
|
|
int error = -EINVAL;
|
277 |
|
|
unsigned int minor;
|
278 |
|
|
|
279 |
|
|
if (!inode || !inode->i_rdev)
|
280 |
|
|
goto out;
|
281 |
|
|
|
282 |
|
|
minor = MINOR(inode->i_rdev);
|
283 |
|
|
|
284 |
|
|
switch (cmd) {
|
285 |
|
|
case BLKFLSBUF:
|
286 |
|
|
if (!capable(CAP_SYS_ADMIN))
|
287 |
|
|
return -EACCES;
|
288 |
|
|
/* special: we want to release the ramdisk memory,
|
289 |
|
|
it's not like with the other blockdevices where
|
290 |
|
|
this ioctl only flushes away the buffer cache. */
|
291 |
|
|
error = -EBUSY;
|
292 |
|
|
down(&inode->i_bdev->bd_sem);
|
293 |
|
|
if (inode->i_bdev->bd_openers <= 2) {
|
294 |
|
|
truncate_inode_pages(inode->i_mapping, 0);
|
295 |
|
|
error = 0;
|
296 |
|
|
}
|
297 |
|
|
up(&inode->i_bdev->bd_sem);
|
298 |
|
|
invalidate_buffers(inode->i_rdev);
|
299 |
|
|
break;
|
300 |
|
|
case BLKGETSIZE: /* Return device size */
|
301 |
|
|
if (!arg)
|
302 |
|
|
break;
|
303 |
|
|
error = put_user(rd_kbsize[minor] << 1, (unsigned long *) arg);
|
304 |
|
|
break;
|
305 |
|
|
case BLKGETSIZE64:
|
306 |
|
|
error = put_user((u64)rd_kbsize[minor]<<10, (u64*)arg);
|
307 |
|
|
break;
|
308 |
|
|
case BLKROSET:
|
309 |
|
|
case BLKROGET:
|
310 |
|
|
case BLKSSZGET:
|
311 |
|
|
error = blk_ioctl(inode->i_rdev, cmd, arg);
|
312 |
|
|
};
|
313 |
|
|
out:
|
314 |
|
|
return error;
|
315 |
|
|
}
|
316 |
|
|
|
317 |
|
|
|
318 |
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
319 |
|
|
|
320 |
|
|
static ssize_t initrd_read(struct file *file, char *buf,
|
321 |
|
|
size_t count, loff_t *ppos)
|
322 |
|
|
{
|
323 |
|
|
int left;
|
324 |
|
|
|
325 |
|
|
left = initrd_end - initrd_start - *ppos;
|
326 |
|
|
if (count > left) count = left;
|
327 |
|
|
if (count == 0) return 0;
|
328 |
|
|
if (copy_to_user(buf, (char *)initrd_start + *ppos, count))
|
329 |
|
|
return -EFAULT;
|
330 |
|
|
*ppos += count;
|
331 |
|
|
return count;
|
332 |
|
|
}
|
333 |
|
|
|
334 |
|
|
|
335 |
|
|
static int initrd_release(struct inode *inode,struct file *file)
|
336 |
|
|
{
|
337 |
|
|
extern void free_initrd_mem(unsigned long, unsigned long);
|
338 |
|
|
|
339 |
|
|
lock_kernel();
|
340 |
|
|
if (!--initrd_users) {
|
341 |
|
|
free_initrd_mem(initrd_start, initrd_end);
|
342 |
|
|
initrd_start = 0;
|
343 |
|
|
}
|
344 |
|
|
unlock_kernel();
|
345 |
|
|
blkdev_put(inode->i_bdev, BDEV_FILE);
|
346 |
|
|
return 0;
|
347 |
|
|
}
|
348 |
|
|
|
349 |
|
|
|
350 |
|
|
static struct file_operations initrd_fops = {
|
351 |
|
|
read: initrd_read,
|
352 |
|
|
release: initrd_release,
|
353 |
|
|
};
|
354 |
|
|
|
355 |
|
|
#endif
|
356 |
|
|
|
357 |
|
|
|
358 |
|
|
static int rd_open(struct inode * inode, struct file * filp)
|
359 |
|
|
{
|
360 |
|
|
int unit = DEVICE_NR(inode->i_rdev);
|
361 |
|
|
|
362 |
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
363 |
|
|
if (unit == INITRD_MINOR) {
|
364 |
|
|
if (!initrd_start) return -ENODEV;
|
365 |
|
|
initrd_users++;
|
366 |
|
|
filp->f_op = &initrd_fops;
|
367 |
|
|
return 0;
|
368 |
|
|
}
|
369 |
|
|
#endif
|
370 |
|
|
|
371 |
|
|
if (unit >= NUM_RAMDISKS)
|
372 |
|
|
return -ENXIO;
|
373 |
|
|
|
374 |
|
|
/*
|
375 |
|
|
* Immunize device against invalidate_buffers() and prune_icache().
|
376 |
|
|
*/
|
377 |
|
|
if (rd_bdev[unit] == NULL) {
|
378 |
|
|
rd_bdev[unit] = bdget(kdev_t_to_nr(inode->i_rdev));
|
379 |
|
|
rd_bdev[unit]->bd_openers++;
|
380 |
|
|
rd_bdev[unit]->bd_inode->i_mapping->a_ops = &ramdisk_aops;
|
381 |
|
|
}
|
382 |
|
|
|
383 |
|
|
return 0;
|
384 |
|
|
}
|
385 |
|
|
|
386 |
|
|
static struct block_device_operations rd_bd_op = {
|
387 |
|
|
owner: THIS_MODULE,
|
388 |
|
|
open: rd_open,
|
389 |
|
|
ioctl: rd_ioctl,
|
390 |
|
|
};
|
391 |
|
|
|
392 |
|
|
/* Before freeing the module, invalidate all of the protected buffers! */
|
393 |
|
|
static void __exit rd_cleanup (void)
|
394 |
|
|
{
|
395 |
|
|
int i;
|
396 |
|
|
|
397 |
|
|
for (i = 0 ; i < NUM_RAMDISKS; i++) {
|
398 |
|
|
struct block_device *bdev = rd_bdev[i];
|
399 |
|
|
rd_bdev[i] = NULL;
|
400 |
|
|
if (bdev)
|
401 |
|
|
blkdev_put(bdev, BDEV_FILE);
|
402 |
|
|
destroy_buffers(MKDEV(MAJOR_NR, i));
|
403 |
|
|
}
|
404 |
|
|
|
405 |
|
|
devfs_unregister (devfs_handle);
|
406 |
|
|
unregister_blkdev( MAJOR_NR, "ramdisk" );
|
407 |
|
|
hardsect_size[MAJOR_NR] = NULL;
|
408 |
|
|
blksize_size[MAJOR_NR] = NULL;
|
409 |
|
|
blk_size[MAJOR_NR] = NULL;
|
410 |
|
|
}
|
411 |
|
|
|
412 |
|
|
/* This is the registration and initialization section of the RAM disk driver */
|
413 |
|
|
static int __init rd_init (void)
|
414 |
|
|
{
|
415 |
|
|
int i;
|
416 |
|
|
|
417 |
|
|
if (rd_blocksize > PAGE_SIZE || rd_blocksize < 512 ||
|
418 |
|
|
(rd_blocksize & (rd_blocksize-1)))
|
419 |
|
|
{
|
420 |
|
|
printk("RAMDISK: wrong blocksize %d, reverting to defaults\n",
|
421 |
|
|
rd_blocksize);
|
422 |
|
|
rd_blocksize = BLOCK_SIZE;
|
423 |
|
|
}
|
424 |
|
|
|
425 |
|
|
if (register_blkdev(MAJOR_NR, "ramdisk", &rd_bd_op)) {
|
426 |
|
|
printk("RAMDISK: Could not get major %d", MAJOR_NR);
|
427 |
|
|
return -EIO;
|
428 |
|
|
}
|
429 |
|
|
|
430 |
|
|
blk_queue_make_request(BLK_DEFAULT_QUEUE(MAJOR_NR), &rd_make_request);
|
431 |
|
|
|
432 |
|
|
for (i = 0; i < NUM_RAMDISKS; i++) {
|
433 |
|
|
/* rd_size is given in kB */
|
434 |
|
|
rd_length[i] = rd_size << 10;
|
435 |
|
|
rd_hardsec[i] = rd_blocksize;
|
436 |
|
|
rd_blocksizes[i] = rd_blocksize;
|
437 |
|
|
rd_kbsize[i] = rd_size;
|
438 |
|
|
}
|
439 |
|
|
devfs_handle = devfs_mk_dir (NULL, "rd", NULL);
|
440 |
|
|
devfs_register_series (devfs_handle, "%u", NUM_RAMDISKS,
|
441 |
|
|
DEVFS_FL_DEFAULT, MAJOR_NR, 0,
|
442 |
|
|
S_IFBLK | S_IRUSR | S_IWUSR,
|
443 |
|
|
&rd_bd_op, NULL);
|
444 |
|
|
|
445 |
|
|
for (i = 0; i < NUM_RAMDISKS; i++)
|
446 |
|
|
register_disk(NULL, MKDEV(MAJOR_NR,i), 1, &rd_bd_op, rd_size<<1);
|
447 |
|
|
|
448 |
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
449 |
|
|
/* We ought to separate initrd operations here */
|
450 |
|
|
register_disk(NULL, MKDEV(MAJOR_NR,INITRD_MINOR), 1, &rd_bd_op, rd_size<<1);
|
451 |
|
|
devfs_register(devfs_handle, "initrd", DEVFS_FL_DEFAULT, MAJOR_NR,
|
452 |
|
|
INITRD_MINOR, S_IFBLK | S_IRUSR, &rd_bd_op, NULL);
|
453 |
|
|
#endif
|
454 |
|
|
|
455 |
|
|
hardsect_size[MAJOR_NR] = rd_hardsec; /* Size of the RAM disk blocks */
|
456 |
|
|
blksize_size[MAJOR_NR] = rd_blocksizes; /* Avoid set_blocksize() check */
|
457 |
|
|
blk_size[MAJOR_NR] = rd_kbsize; /* Size of the RAM disk in kB */
|
458 |
|
|
|
459 |
|
|
/* rd_size is given in kB */
|
460 |
|
|
printk("RAMDISK driver initialized: "
|
461 |
|
|
"%d RAM disks of %dK size %d blocksize\n",
|
462 |
|
|
NUM_RAMDISKS, rd_size, rd_blocksize);
|
463 |
|
|
|
464 |
|
|
return 0;
|
465 |
|
|
}
|
466 |
|
|
|
467 |
|
|
module_init(rd_init);
|
468 |
|
|
module_exit(rd_cleanup);
|
469 |
|
|
|
470 |
|
|
/* options - nonmodular */
|
471 |
|
|
#ifndef MODULE
|
472 |
|
|
static int __init ramdisk_size(char *str)
|
473 |
|
|
{
|
474 |
|
|
rd_size = simple_strtol(str,NULL,0);
|
475 |
|
|
return 1;
|
476 |
|
|
}
|
477 |
|
|
static int __init ramdisk_size2(char *str) /* kludge */
|
478 |
|
|
{
|
479 |
|
|
return ramdisk_size(str);
|
480 |
|
|
}
|
481 |
|
|
static int __init ramdisk_blocksize(char *str)
|
482 |
|
|
{
|
483 |
|
|
rd_blocksize = simple_strtol(str,NULL,0);
|
484 |
|
|
return 1;
|
485 |
|
|
}
|
486 |
|
|
__setup("ramdisk=", ramdisk_size);
|
487 |
|
|
__setup("ramdisk_size=", ramdisk_size2);
|
488 |
|
|
__setup("ramdisk_blocksize=", ramdisk_blocksize);
|
489 |
|
|
#endif
|
490 |
|
|
|
491 |
|
|
/* options - modular */
|
492 |
|
|
MODULE_PARM (rd_size, "1i");
|
493 |
|
|
MODULE_PARM_DESC(rd_size, "Size of each RAM disk in kbytes.");
|
494 |
|
|
MODULE_PARM (rd_blocksize, "i");
|
495 |
|
|
MODULE_PARM_DESC(rd_blocksize, "Blocksize of each RAM disk in bytes.");
|
496 |
|
|
|
497 |
|
|
MODULE_LICENSE("GPL");
|