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6
7#ifdef __CHECKER__
8#undef __CHECKER__
9#warning "Sparse checking disabled for this file"
10#endif
11
12#include <linux/kernel.h>
13#include <linux/fs.h>
14#include <linux/minix_fs.h>
15#include <linux/ext2_fs.h>
16#include <linux/romfs_fs.h>
17#include <uapi/linux/cramfs_fs.h>
18#include <linux/initrd.h>
19#include <linux/string.h>
20#include <linux/slab.h>
21
22#include "do_mounts.h"
23#include "../fs/squashfs/squashfs_fs.h"
24
25#include <linux/decompress/generic.h>
26
27
28int __initdata rd_prompt = 1;
29
30static int __init prompt_ramdisk(char *str)
31{
32 rd_prompt = simple_strtol(str,NULL,0) & 1;
33 return 1;
34}
35__setup("prompt_ramdisk=", prompt_ramdisk);
36
37int __initdata rd_image_start;
38
39static int __init ramdisk_start_setup(char *str)
40{
41 rd_image_start = simple_strtol(str,NULL,0);
42 return 1;
43}
44__setup("ramdisk_start=", ramdisk_start_setup);
45
46static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67static int __init
68identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
69{
70 const int size = 512;
71 struct minix_super_block *minixsb;
72 struct romfs_super_block *romfsb;
73 struct cramfs_super *cramfsb;
74 struct squashfs_super_block *squashfsb;
75 int nblocks = -1;
76 unsigned char *buf;
77 const char *compress_name;
78 unsigned long n;
79
80 buf = kmalloc(size, GFP_KERNEL);
81 if (!buf)
82 return -ENOMEM;
83
84 minixsb = (struct minix_super_block *) buf;
85 romfsb = (struct romfs_super_block *) buf;
86 cramfsb = (struct cramfs_super *) buf;
87 squashfsb = (struct squashfs_super_block *) buf;
88 memset(buf, 0xe5, size);
89
90
91
92
93 ksys_lseek(fd, start_block * BLOCK_SIZE, 0);
94 ksys_read(fd, buf, size);
95
96 *decompressor = decompress_method(buf, size, &compress_name);
97 if (compress_name) {
98 printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n",
99 compress_name, start_block);
100 if (!*decompressor)
101 printk(KERN_EMERG
102 "RAMDISK: %s decompressor not configured!\n",
103 compress_name);
104 nblocks = 0;
105 goto done;
106 }
107
108
109 if (romfsb->word0 == ROMSB_WORD0 &&
110 romfsb->word1 == ROMSB_WORD1) {
111 printk(KERN_NOTICE
112 "RAMDISK: romfs filesystem found at block %d\n",
113 start_block);
114 nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
115 goto done;
116 }
117
118 if (cramfsb->magic == CRAMFS_MAGIC) {
119 printk(KERN_NOTICE
120 "RAMDISK: cramfs filesystem found at block %d\n",
121 start_block);
122 nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
123 goto done;
124 }
125
126
127 if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
128 printk(KERN_NOTICE
129 "RAMDISK: squashfs filesystem found at block %d\n",
130 start_block);
131 nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1)
132 >> BLOCK_SIZE_BITS;
133 goto done;
134 }
135
136
137
138
139 ksys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0);
140 ksys_read(fd, buf, size);
141
142 if (cramfsb->magic == CRAMFS_MAGIC) {
143 printk(KERN_NOTICE
144 "RAMDISK: cramfs filesystem found at block %d\n",
145 start_block);
146 nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
147 goto done;
148 }
149
150
151
152
153 ksys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
154 ksys_read(fd, buf, size);
155
156
157 if (minixsb->s_magic == MINIX_SUPER_MAGIC ||
158 minixsb->s_magic == MINIX_SUPER_MAGIC2) {
159 printk(KERN_NOTICE
160 "RAMDISK: Minix filesystem found at block %d\n",
161 start_block);
162 nblocks = minixsb->s_nzones << minixsb->s_log_zone_size;
163 goto done;
164 }
165
166
167 n = ext2_image_size(buf);
168 if (n) {
169 printk(KERN_NOTICE
170 "RAMDISK: ext2 filesystem found at block %d\n",
171 start_block);
172 nblocks = n;
173 goto done;
174 }
175
176 printk(KERN_NOTICE
177 "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n",
178 start_block);
179
180done:
181 ksys_lseek(fd, start_block * BLOCK_SIZE, 0);
182 kfree(buf);
183 return nblocks;
184}
185
186int __init rd_load_image(char *from)
187{
188 int res = 0;
189 int in_fd, out_fd;
190 unsigned long rd_blocks, devblocks;
191 int nblocks, i, disk;
192 char *buf = NULL;
193 unsigned short rotate = 0;
194 decompress_fn decompressor = NULL;
195#if !defined(CONFIG_S390)
196 char rotator[4] = { '|' , '/' , '-' , '\\' };
197#endif
198
199 out_fd = ksys_open("/dev/ram", O_RDWR, 0);
200 if (out_fd < 0)
201 goto out;
202
203 in_fd = ksys_open(from, O_RDONLY, 0);
204 if (in_fd < 0)
205 goto noclose_input;
206
207 nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor);
208 if (nblocks < 0)
209 goto done;
210
211 if (nblocks == 0) {
212 if (crd_load(in_fd, out_fd, decompressor) == 0)
213 goto successful_load;
214 goto done;
215 }
216
217
218
219
220
221 if (ksys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
222 rd_blocks = 0;
223 else
224 rd_blocks >>= 1;
225
226 if (nblocks > rd_blocks) {
227 printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n",
228 nblocks, rd_blocks);
229 goto done;
230 }
231
232
233
234
235 if (ksys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0)
236 devblocks = 0;
237 else
238 devblocks >>= 1;
239
240 if (strcmp(from, "/initrd.image") == 0)
241 devblocks = nblocks;
242
243 if (devblocks == 0) {
244 printk(KERN_ERR "RAMDISK: could not determine device size\n");
245 goto done;
246 }
247
248 buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
249 if (!buf) {
250 printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
251 goto done;
252 }
253
254 printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ",
255 nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
256 for (i = 0, disk = 1; i < nblocks; i++) {
257 if (i && (i % devblocks == 0)) {
258 pr_cont("done disk #%d.\n", disk++);
259 rotate = 0;
260 if (ksys_close(in_fd)) {
261 printk("Error closing the disk.\n");
262 goto noclose_input;
263 }
264 change_floppy("disk #%d", disk);
265 in_fd = ksys_open(from, O_RDONLY, 0);
266 if (in_fd < 0) {
267 printk("Error opening disk.\n");
268 goto noclose_input;
269 }
270 printk("Loading disk #%d... ", disk);
271 }
272 ksys_read(in_fd, buf, BLOCK_SIZE);
273 ksys_write(out_fd, buf, BLOCK_SIZE);
274#if !defined(CONFIG_S390)
275 if (!(i % 16)) {
276 pr_cont("%c\b", rotator[rotate & 0x3]);
277 rotate++;
278 }
279#endif
280 }
281 pr_cont("done.\n");
282
283successful_load:
284 res = 1;
285done:
286 ksys_close(in_fd);
287noclose_input:
288 ksys_close(out_fd);
289out:
290 kfree(buf);
291 ksys_unlink("/dev/ram");
292 return res;
293}
294
295int __init rd_load_disk(int n)
296{
297 if (rd_prompt)
298 change_floppy("root floppy disk to be loaded into RAM disk");
299 create_dev("/dev/root", ROOT_DEV);
300 create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
301 return rd_load_image("/dev/root");
302}
303
304static int exit_code;
305static int decompress_error;
306static int crd_infd, crd_outfd;
307
308static long __init compr_fill(void *buf, unsigned long len)
309{
310 long r = ksys_read(crd_infd, buf, len);
311 if (r < 0)
312 printk(KERN_ERR "RAMDISK: error while reading compressed data");
313 else if (r == 0)
314 printk(KERN_ERR "RAMDISK: EOF while reading compressed data");
315 return r;
316}
317
318static long __init compr_flush(void *window, unsigned long outcnt)
319{
320 long written = ksys_write(crd_outfd, window, outcnt);
321 if (written != outcnt) {
322 if (decompress_error == 0)
323 printk(KERN_ERR
324 "RAMDISK: incomplete write (%ld != %ld)\n",
325 written, outcnt);
326 decompress_error = 1;
327 return -1;
328 }
329 return outcnt;
330}
331
332static void __init error(char *x)
333{
334 printk(KERN_ERR "%s\n", x);
335 exit_code = 1;
336 decompress_error = 1;
337}
338
339static int __init crd_load(int in_fd, int out_fd, decompress_fn deco)
340{
341 int result;
342 crd_infd = in_fd;
343 crd_outfd = out_fd;
344
345 if (!deco) {
346 pr_emerg("Invalid ramdisk decompression routine. "
347 "Select appropriate config option.\n");
348 panic("Could not decompress initial ramdisk image.");
349 }
350
351 result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error);
352 if (decompress_error)
353 result = 1;
354 return result;
355}
356
