Commit | Line | Data |
---|---|---|
c67e5382 HS |
1 | /* |
2 | * Many of the syscalls used in this file expect some of the arguments | |
3 | * to be __user pointers not __kernel pointers. To limit the sparse | |
4 | * noise, turn off sparse checking for this file. | |
5 | */ | |
6 | #ifdef __CHECKER__ | |
7 | #undef __CHECKER__ | |
8 | #warning "Sparse checking disabled for this file" | |
9 | #endif | |
1da177e4 LT |
10 | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/minix_fs.h> | |
14 | #include <linux/ext2_fs.h> | |
15 | #include <linux/romfs_fs.h> | |
16 | #include <linux/cramfs_fs.h> | |
17 | #include <linux/initrd.h> | |
18 | #include <linux/string.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | |
21 | #include "do_mounts.h" | |
b8fed87d | 22 | #include "../fs/squashfs/squashfs_fs.h" |
1da177e4 | 23 | |
30d65dbf AK |
24 | #include <linux/decompress/generic.h> |
25 | ||
30d65dbf | 26 | |
1da177e4 LT |
27 | int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */ |
28 | ||
29 | static int __init prompt_ramdisk(char *str) | |
30 | { | |
31 | rd_prompt = simple_strtol(str,NULL,0) & 1; | |
32 | return 1; | |
33 | } | |
34 | __setup("prompt_ramdisk=", prompt_ramdisk); | |
35 | ||
36 | int __initdata rd_image_start; /* starting block # of image */ | |
37 | ||
38 | static int __init ramdisk_start_setup(char *str) | |
39 | { | |
40 | rd_image_start = simple_strtol(str,NULL,0); | |
41 | return 1; | |
42 | } | |
43 | __setup("ramdisk_start=", ramdisk_start_setup); | |
44 | ||
30d65dbf | 45 | static int __init crd_load(int in_fd, int out_fd, decompress_fn deco); |
1da177e4 LT |
46 | |
47 | /* | |
48 | * This routine tries to find a RAM disk image to load, and returns the | |
49 | * number of blocks to read for a non-compressed image, 0 if the image | |
50 | * is a compressed image, and -1 if an image with the right magic | |
51 | * numbers could not be found. | |
52 | * | |
53 | * We currently check for the following magic numbers: | |
b172fd88 PA |
54 | * minix |
55 | * ext2 | |
1da177e4 LT |
56 | * romfs |
57 | * cramfs | |
b8fed87d | 58 | * squashfs |
b172fd88 | 59 | * gzip |
1bf49dd4 | 60 | * bzip2 |
61 | * lzma | |
62 | * xz | |
63 | * lzo | |
64 | * lz4 | |
1da177e4 | 65 | */ |
b172fd88 | 66 | static int __init |
30d65dbf | 67 | identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) |
1da177e4 LT |
68 | { |
69 | const int size = 512; | |
70 | struct minix_super_block *minixsb; | |
1da177e4 LT |
71 | struct romfs_super_block *romfsb; |
72 | struct cramfs_super *cramfsb; | |
b8fed87d | 73 | struct squashfs_super_block *squashfsb; |
1da177e4 LT |
74 | int nblocks = -1; |
75 | unsigned char *buf; | |
889c92d2 | 76 | const char *compress_name; |
39429c5e | 77 | unsigned long n; |
1da177e4 LT |
78 | |
79 | buf = kmalloc(size, GFP_KERNEL); | |
c80544dc | 80 | if (!buf) |
ea611b26 | 81 | return -ENOMEM; |
1da177e4 LT |
82 | |
83 | minixsb = (struct minix_super_block *) buf; | |
1da177e4 LT |
84 | romfsb = (struct romfs_super_block *) buf; |
85 | cramfsb = (struct cramfs_super *) buf; | |
b8fed87d | 86 | squashfsb = (struct squashfs_super_block *) buf; |
1da177e4 LT |
87 | memset(buf, 0xe5, size); |
88 | ||
89 | /* | |
b172fd88 | 90 | * Read block 0 to test for compressed kernel |
1da177e4 LT |
91 | */ |
92 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); | |
93 | sys_read(fd, buf, size); | |
94 | ||
889c92d2 | 95 | *decompressor = decompress_method(buf, size, &compress_name); |
23a22d57 | 96 | if (compress_name) { |
889c92d2 PA |
97 | printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n", |
98 | compress_name, start_block); | |
23a22d57 | 99 | if (!*decompressor) |
73310a16 PA |
100 | printk(KERN_EMERG |
101 | "RAMDISK: %s decompressor not configured!\n", | |
23a22d57 | 102 | compress_name); |
889c92d2 PA |
103 | nblocks = 0; |
104 | goto done; | |
1da177e4 LT |
105 | } |
106 | ||
107 | /* romfs is at block zero too */ | |
108 | if (romfsb->word0 == ROMSB_WORD0 && | |
109 | romfsb->word1 == ROMSB_WORD1) { | |
110 | printk(KERN_NOTICE | |
111 | "RAMDISK: romfs filesystem found at block %d\n", | |
112 | start_block); | |
113 | nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; | |
114 | goto done; | |
115 | } | |
116 | ||
117 | if (cramfsb->magic == CRAMFS_MAGIC) { | |
118 | printk(KERN_NOTICE | |
119 | "RAMDISK: cramfs filesystem found at block %d\n", | |
120 | start_block); | |
121 | nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; | |
122 | goto done; | |
123 | } | |
124 | ||
b8fed87d PL |
125 | /* squashfs is at block zero too */ |
126 | if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) { | |
127 | printk(KERN_NOTICE | |
128 | "RAMDISK: squashfs filesystem found at block %d\n", | |
129 | start_block); | |
130 | nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1) | |
131 | >> BLOCK_SIZE_BITS; | |
132 | goto done; | |
133 | } | |
134 | ||
f919b923 NA |
135 | /* |
136 | * Read 512 bytes further to check if cramfs is padded | |
137 | */ | |
138 | sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0); | |
139 | sys_read(fd, buf, size); | |
140 | ||
141 | if (cramfsb->magic == CRAMFS_MAGIC) { | |
142 | printk(KERN_NOTICE | |
143 | "RAMDISK: cramfs filesystem found at block %d\n", | |
144 | start_block); | |
145 | nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; | |
146 | goto done; | |
147 | } | |
148 | ||
1da177e4 LT |
149 | /* |
150 | * Read block 1 to test for minix and ext2 superblock | |
151 | */ | |
152 | sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0); | |
153 | sys_read(fd, buf, size); | |
154 | ||
155 | /* Try minix */ | |
156 | if (minixsb->s_magic == MINIX_SUPER_MAGIC || | |
157 | minixsb->s_magic == MINIX_SUPER_MAGIC2) { | |
158 | printk(KERN_NOTICE | |
159 | "RAMDISK: Minix filesystem found at block %d\n", | |
160 | start_block); | |
161 | nblocks = minixsb->s_nzones << minixsb->s_log_zone_size; | |
162 | goto done; | |
163 | } | |
164 | ||
165 | /* Try ext2 */ | |
39429c5e AV |
166 | n = ext2_image_size(buf); |
167 | if (n) { | |
1da177e4 LT |
168 | printk(KERN_NOTICE |
169 | "RAMDISK: ext2 filesystem found at block %d\n", | |
170 | start_block); | |
39429c5e | 171 | nblocks = n; |
1da177e4 LT |
172 | goto done; |
173 | } | |
174 | ||
175 | printk(KERN_NOTICE | |
176 | "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n", | |
177 | start_block); | |
b172fd88 | 178 | |
1da177e4 LT |
179 | done: |
180 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); | |
181 | kfree(buf); | |
182 | return nblocks; | |
183 | } | |
184 | ||
185 | int __init rd_load_image(char *from) | |
186 | { | |
187 | int res = 0; | |
188 | int in_fd, out_fd; | |
189 | unsigned long rd_blocks, devblocks; | |
190 | int nblocks, i, disk; | |
191 | char *buf = NULL; | |
192 | unsigned short rotate = 0; | |
30d65dbf | 193 | decompress_fn decompressor = NULL; |
bc58450b | 194 | #if !defined(CONFIG_S390) |
1da177e4 LT |
195 | char rotator[4] = { '|' , '/' , '-' , '\\' }; |
196 | #endif | |
197 | ||
c67e5382 | 198 | out_fd = sys_open("/dev/ram", O_RDWR, 0); |
1da177e4 LT |
199 | if (out_fd < 0) |
200 | goto out; | |
201 | ||
202 | in_fd = sys_open(from, O_RDONLY, 0); | |
203 | if (in_fd < 0) | |
204 | goto noclose_input; | |
205 | ||
30d65dbf | 206 | nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor); |
1da177e4 LT |
207 | if (nblocks < 0) |
208 | goto done; | |
209 | ||
210 | if (nblocks == 0) { | |
30d65dbf | 211 | if (crd_load(in_fd, out_fd, decompressor) == 0) |
1da177e4 | 212 | goto successful_load; |
1da177e4 LT |
213 | goto done; |
214 | } | |
215 | ||
216 | /* | |
217 | * NOTE NOTE: nblocks is not actually blocks but | |
218 | * the number of kibibytes of data to load into a ramdisk. | |
219 | * So any ramdisk block size that is a multiple of 1KiB should | |
220 | * work when the appropriate ramdisk_blocksize is specified | |
221 | * on the command line. | |
222 | * | |
223 | * The default ramdisk_blocksize is 1KiB and it is generally | |
224 | * silly to use anything else, so make sure to use 1KiB | |
225 | * blocksize while generating ext2fs ramdisk-images. | |
226 | */ | |
227 | if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0) | |
228 | rd_blocks = 0; | |
229 | else | |
230 | rd_blocks >>= 1; | |
231 | ||
232 | if (nblocks > rd_blocks) { | |
233 | printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n", | |
234 | nblocks, rd_blocks); | |
235 | goto done; | |
236 | } | |
b172fd88 | 237 | |
1da177e4 LT |
238 | /* |
239 | * OK, time to copy in the data | |
240 | */ | |
241 | if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0) | |
242 | devblocks = 0; | |
243 | else | |
244 | devblocks >>= 1; | |
245 | ||
246 | if (strcmp(from, "/initrd.image") == 0) | |
247 | devblocks = nblocks; | |
248 | ||
249 | if (devblocks == 0) { | |
250 | printk(KERN_ERR "RAMDISK: could not determine device size\n"); | |
251 | goto done; | |
252 | } | |
253 | ||
254 | buf = kmalloc(BLOCK_SIZE, GFP_KERNEL); | |
d613c3e2 | 255 | if (!buf) { |
1da177e4 LT |
256 | printk(KERN_ERR "RAMDISK: could not allocate buffer\n"); |
257 | goto done; | |
258 | } | |
259 | ||
260 | printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ", | |
261 | nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : ""); | |
262 | for (i = 0, disk = 1; i < nblocks; i++) { | |
263 | if (i && (i % devblocks == 0)) { | |
264 | printk("done disk #%d.\n", disk++); | |
265 | rotate = 0; | |
266 | if (sys_close(in_fd)) { | |
267 | printk("Error closing the disk.\n"); | |
268 | goto noclose_input; | |
269 | } | |
270 | change_floppy("disk #%d", disk); | |
271 | in_fd = sys_open(from, O_RDONLY, 0); | |
272 | if (in_fd < 0) { | |
273 | printk("Error opening disk.\n"); | |
274 | goto noclose_input; | |
275 | } | |
276 | printk("Loading disk #%d... ", disk); | |
277 | } | |
278 | sys_read(in_fd, buf, BLOCK_SIZE); | |
279 | sys_write(out_fd, buf, BLOCK_SIZE); | |
bc58450b | 280 | #if !defined(CONFIG_S390) |
1da177e4 LT |
281 | if (!(i % 16)) { |
282 | printk("%c\b", rotator[rotate & 0x3]); | |
283 | rotate++; | |
284 | } | |
285 | #endif | |
286 | } | |
287 | printk("done.\n"); | |
288 | ||
289 | successful_load: | |
290 | res = 1; | |
291 | done: | |
292 | sys_close(in_fd); | |
293 | noclose_input: | |
294 | sys_close(out_fd); | |
295 | out: | |
296 | kfree(buf); | |
c67e5382 | 297 | sys_unlink("/dev/ram"); |
1da177e4 LT |
298 | return res; |
299 | } | |
300 | ||
301 | int __init rd_load_disk(int n) | |
302 | { | |
303 | if (rd_prompt) | |
304 | change_floppy("root floppy disk to be loaded into RAM disk"); | |
bdaf8529 GKH |
305 | create_dev("/dev/root", ROOT_DEV); |
306 | create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n)); | |
1da177e4 LT |
307 | return rd_load_image("/dev/root"); |
308 | } | |
309 | ||
1da177e4 | 310 | static int exit_code; |
30d65dbf | 311 | static int decompress_error; |
1da177e4 LT |
312 | static int crd_infd, crd_outfd; |
313 | ||
30d65dbf | 314 | static int __init compr_fill(void *buf, unsigned int len) |
1da177e4 | 315 | { |
30d65dbf AK |
316 | int r = sys_read(crd_infd, buf, len); |
317 | if (r < 0) | |
318 | printk(KERN_ERR "RAMDISK: error while reading compressed data"); | |
319 | else if (r == 0) | |
320 | printk(KERN_ERR "RAMDISK: EOF while reading compressed data"); | |
321 | return r; | |
1da177e4 LT |
322 | } |
323 | ||
30d65dbf | 324 | static int __init compr_flush(void *window, unsigned int outcnt) |
1da177e4 | 325 | { |
30d65dbf AK |
326 | int written = sys_write(crd_outfd, window, outcnt); |
327 | if (written != outcnt) { | |
328 | if (decompress_error == 0) | |
329 | printk(KERN_ERR | |
330 | "RAMDISK: incomplete write (%d != %d)\n", | |
331 | written, outcnt); | |
332 | decompress_error = 1; | |
333 | return -1; | |
334 | } | |
335 | return outcnt; | |
1da177e4 LT |
336 | } |
337 | ||
338 | static void __init error(char *x) | |
339 | { | |
340 | printk(KERN_ERR "%s\n", x); | |
341 | exit_code = 1; | |
30d65dbf | 342 | decompress_error = 1; |
1da177e4 LT |
343 | } |
344 | ||
30d65dbf | 345 | static int __init crd_load(int in_fd, int out_fd, decompress_fn deco) |
1da177e4 LT |
346 | { |
347 | int result; | |
1da177e4 LT |
348 | crd_infd = in_fd; |
349 | crd_outfd = out_fd; | |
df3ef3af | 350 | |
351 | if (!deco) { | |
352 | pr_emerg("Invalid ramdisk decompression routine. " | |
353 | "Select appropriate config option.\n"); | |
354 | panic("Could not decompress initial ramdisk image."); | |
355 | } | |
356 | ||
30d65dbf AK |
357 | result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error); |
358 | if (decompress_error) | |
1da177e4 | 359 | result = 1; |
1da177e4 LT |
360 | return result; |
361 | } |