Commit | Line | Data |
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1da177e4 LT |
1 | |
2 | #include <linux/kernel.h> | |
3 | #include <linux/fs.h> | |
4 | #include <linux/minix_fs.h> | |
5 | #include <linux/ext2_fs.h> | |
6 | #include <linux/romfs_fs.h> | |
7 | #include <linux/cramfs_fs.h> | |
8 | #include <linux/initrd.h> | |
9 | #include <linux/string.h> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
1da177e4 LT |
11 | |
12 | #include "do_mounts.h" | |
b8fed87d | 13 | #include "../fs/squashfs/squashfs_fs.h" |
1da177e4 | 14 | |
30d65dbf AK |
15 | #include <linux/decompress/generic.h> |
16 | ||
30d65dbf | 17 | |
1da177e4 LT |
18 | int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */ |
19 | ||
20 | static int __init prompt_ramdisk(char *str) | |
21 | { | |
22 | rd_prompt = simple_strtol(str,NULL,0) & 1; | |
23 | return 1; | |
24 | } | |
25 | __setup("prompt_ramdisk=", prompt_ramdisk); | |
26 | ||
27 | int __initdata rd_image_start; /* starting block # of image */ | |
28 | ||
29 | static int __init ramdisk_start_setup(char *str) | |
30 | { | |
31 | rd_image_start = simple_strtol(str,NULL,0); | |
32 | return 1; | |
33 | } | |
34 | __setup("ramdisk_start=", ramdisk_start_setup); | |
35 | ||
30d65dbf | 36 | static int __init crd_load(int in_fd, int out_fd, decompress_fn deco); |
1da177e4 LT |
37 | |
38 | /* | |
39 | * This routine tries to find a RAM disk image to load, and returns the | |
40 | * number of blocks to read for a non-compressed image, 0 if the image | |
41 | * is a compressed image, and -1 if an image with the right magic | |
42 | * numbers could not be found. | |
43 | * | |
44 | * We currently check for the following magic numbers: | |
b172fd88 PA |
45 | * minix |
46 | * ext2 | |
1da177e4 LT |
47 | * romfs |
48 | * cramfs | |
b8fed87d | 49 | * squashfs |
b172fd88 | 50 | * gzip |
1da177e4 | 51 | */ |
b172fd88 | 52 | static int __init |
30d65dbf | 53 | identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) |
1da177e4 LT |
54 | { |
55 | const int size = 512; | |
56 | struct minix_super_block *minixsb; | |
57 | struct ext2_super_block *ext2sb; | |
58 | struct romfs_super_block *romfsb; | |
59 | struct cramfs_super *cramfsb; | |
b8fed87d | 60 | struct squashfs_super_block *squashfsb; |
1da177e4 LT |
61 | int nblocks = -1; |
62 | unsigned char *buf; | |
889c92d2 | 63 | const char *compress_name; |
1da177e4 LT |
64 | |
65 | buf = kmalloc(size, GFP_KERNEL); | |
c80544dc | 66 | if (!buf) |
ea611b26 | 67 | return -ENOMEM; |
1da177e4 LT |
68 | |
69 | minixsb = (struct minix_super_block *) buf; | |
70 | ext2sb = (struct ext2_super_block *) buf; | |
71 | romfsb = (struct romfs_super_block *) buf; | |
72 | cramfsb = (struct cramfs_super *) buf; | |
b8fed87d | 73 | squashfsb = (struct squashfs_super_block *) buf; |
1da177e4 LT |
74 | memset(buf, 0xe5, size); |
75 | ||
76 | /* | |
b172fd88 | 77 | * Read block 0 to test for compressed kernel |
1da177e4 LT |
78 | */ |
79 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); | |
80 | sys_read(fd, buf, size); | |
81 | ||
889c92d2 | 82 | *decompressor = decompress_method(buf, size, &compress_name); |
23a22d57 | 83 | if (compress_name) { |
889c92d2 PA |
84 | printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n", |
85 | compress_name, start_block); | |
23a22d57 | 86 | if (!*decompressor) |
73310a16 PA |
87 | printk(KERN_EMERG |
88 | "RAMDISK: %s decompressor not configured!\n", | |
23a22d57 | 89 | compress_name); |
889c92d2 PA |
90 | nblocks = 0; |
91 | goto done; | |
1da177e4 LT |
92 | } |
93 | ||
94 | /* romfs is at block zero too */ | |
95 | if (romfsb->word0 == ROMSB_WORD0 && | |
96 | romfsb->word1 == ROMSB_WORD1) { | |
97 | printk(KERN_NOTICE | |
98 | "RAMDISK: romfs filesystem found at block %d\n", | |
99 | start_block); | |
100 | nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; | |
101 | goto done; | |
102 | } | |
103 | ||
104 | if (cramfsb->magic == CRAMFS_MAGIC) { | |
105 | printk(KERN_NOTICE | |
106 | "RAMDISK: cramfs filesystem found at block %d\n", | |
107 | start_block); | |
108 | nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; | |
109 | goto done; | |
110 | } | |
111 | ||
b8fed87d PL |
112 | /* squashfs is at block zero too */ |
113 | if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) { | |
114 | printk(KERN_NOTICE | |
115 | "RAMDISK: squashfs filesystem found at block %d\n", | |
116 | start_block); | |
117 | nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1) | |
118 | >> BLOCK_SIZE_BITS; | |
119 | goto done; | |
120 | } | |
121 | ||
f919b923 NA |
122 | /* |
123 | * Read 512 bytes further to check if cramfs is padded | |
124 | */ | |
125 | sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0); | |
126 | sys_read(fd, buf, size); | |
127 | ||
128 | if (cramfsb->magic == CRAMFS_MAGIC) { | |
129 | printk(KERN_NOTICE | |
130 | "RAMDISK: cramfs filesystem found at block %d\n", | |
131 | start_block); | |
132 | nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; | |
133 | goto done; | |
134 | } | |
135 | ||
1da177e4 LT |
136 | /* |
137 | * Read block 1 to test for minix and ext2 superblock | |
138 | */ | |
139 | sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0); | |
140 | sys_read(fd, buf, size); | |
141 | ||
142 | /* Try minix */ | |
143 | if (minixsb->s_magic == MINIX_SUPER_MAGIC || | |
144 | minixsb->s_magic == MINIX_SUPER_MAGIC2) { | |
145 | printk(KERN_NOTICE | |
146 | "RAMDISK: Minix filesystem found at block %d\n", | |
147 | start_block); | |
148 | nblocks = minixsb->s_nzones << minixsb->s_log_zone_size; | |
149 | goto done; | |
150 | } | |
151 | ||
152 | /* Try ext2 */ | |
153 | if (ext2sb->s_magic == cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
154 | printk(KERN_NOTICE | |
155 | "RAMDISK: ext2 filesystem found at block %d\n", | |
156 | start_block); | |
157 | nblocks = le32_to_cpu(ext2sb->s_blocks_count) << | |
158 | le32_to_cpu(ext2sb->s_log_block_size); | |
159 | goto done; | |
160 | } | |
161 | ||
162 | printk(KERN_NOTICE | |
163 | "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n", | |
164 | start_block); | |
b172fd88 | 165 | |
1da177e4 LT |
166 | done: |
167 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); | |
168 | kfree(buf); | |
169 | return nblocks; | |
170 | } | |
171 | ||
172 | int __init rd_load_image(char *from) | |
173 | { | |
174 | int res = 0; | |
175 | int in_fd, out_fd; | |
176 | unsigned long rd_blocks, devblocks; | |
177 | int nblocks, i, disk; | |
178 | char *buf = NULL; | |
179 | unsigned short rotate = 0; | |
30d65dbf | 180 | decompress_fn decompressor = NULL; |
347a8dc3 | 181 | #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES) |
1da177e4 LT |
182 | char rotator[4] = { '|' , '/' , '-' , '\\' }; |
183 | #endif | |
184 | ||
562f5e63 | 185 | out_fd = sys_open((const char __user __force *) "/dev/ram", O_RDWR, 0); |
1da177e4 LT |
186 | if (out_fd < 0) |
187 | goto out; | |
188 | ||
189 | in_fd = sys_open(from, O_RDONLY, 0); | |
190 | if (in_fd < 0) | |
191 | goto noclose_input; | |
192 | ||
30d65dbf | 193 | nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor); |
1da177e4 LT |
194 | if (nblocks < 0) |
195 | goto done; | |
196 | ||
197 | if (nblocks == 0) { | |
30d65dbf | 198 | if (crd_load(in_fd, out_fd, decompressor) == 0) |
1da177e4 | 199 | goto successful_load; |
1da177e4 LT |
200 | goto done; |
201 | } | |
202 | ||
203 | /* | |
204 | * NOTE NOTE: nblocks is not actually blocks but | |
205 | * the number of kibibytes of data to load into a ramdisk. | |
206 | * So any ramdisk block size that is a multiple of 1KiB should | |
207 | * work when the appropriate ramdisk_blocksize is specified | |
208 | * on the command line. | |
209 | * | |
210 | * The default ramdisk_blocksize is 1KiB and it is generally | |
211 | * silly to use anything else, so make sure to use 1KiB | |
212 | * blocksize while generating ext2fs ramdisk-images. | |
213 | */ | |
214 | if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0) | |
215 | rd_blocks = 0; | |
216 | else | |
217 | rd_blocks >>= 1; | |
218 | ||
219 | if (nblocks > rd_blocks) { | |
220 | printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n", | |
221 | nblocks, rd_blocks); | |
222 | goto done; | |
223 | } | |
b172fd88 | 224 | |
1da177e4 LT |
225 | /* |
226 | * OK, time to copy in the data | |
227 | */ | |
228 | if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0) | |
229 | devblocks = 0; | |
230 | else | |
231 | devblocks >>= 1; | |
232 | ||
233 | if (strcmp(from, "/initrd.image") == 0) | |
234 | devblocks = nblocks; | |
235 | ||
236 | if (devblocks == 0) { | |
237 | printk(KERN_ERR "RAMDISK: could not determine device size\n"); | |
238 | goto done; | |
239 | } | |
240 | ||
241 | buf = kmalloc(BLOCK_SIZE, GFP_KERNEL); | |
d613c3e2 | 242 | if (!buf) { |
1da177e4 LT |
243 | printk(KERN_ERR "RAMDISK: could not allocate buffer\n"); |
244 | goto done; | |
245 | } | |
246 | ||
247 | printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ", | |
248 | nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : ""); | |
249 | for (i = 0, disk = 1; i < nblocks; i++) { | |
250 | if (i && (i % devblocks == 0)) { | |
251 | printk("done disk #%d.\n", disk++); | |
252 | rotate = 0; | |
253 | if (sys_close(in_fd)) { | |
254 | printk("Error closing the disk.\n"); | |
255 | goto noclose_input; | |
256 | } | |
257 | change_floppy("disk #%d", disk); | |
258 | in_fd = sys_open(from, O_RDONLY, 0); | |
259 | if (in_fd < 0) { | |
260 | printk("Error opening disk.\n"); | |
261 | goto noclose_input; | |
262 | } | |
263 | printk("Loading disk #%d... ", disk); | |
264 | } | |
265 | sys_read(in_fd, buf, BLOCK_SIZE); | |
266 | sys_write(out_fd, buf, BLOCK_SIZE); | |
347a8dc3 | 267 | #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES) |
1da177e4 LT |
268 | if (!(i % 16)) { |
269 | printk("%c\b", rotator[rotate & 0x3]); | |
270 | rotate++; | |
271 | } | |
272 | #endif | |
273 | } | |
274 | printk("done.\n"); | |
275 | ||
276 | successful_load: | |
277 | res = 1; | |
278 | done: | |
279 | sys_close(in_fd); | |
280 | noclose_input: | |
281 | sys_close(out_fd); | |
282 | out: | |
283 | kfree(buf); | |
562f5e63 | 284 | sys_unlink((const char __user __force *) "/dev/ram"); |
1da177e4 LT |
285 | return res; |
286 | } | |
287 | ||
288 | int __init rd_load_disk(int n) | |
289 | { | |
290 | if (rd_prompt) | |
291 | change_floppy("root floppy disk to be loaded into RAM disk"); | |
bdaf8529 GKH |
292 | create_dev("/dev/root", ROOT_DEV); |
293 | create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n)); | |
1da177e4 LT |
294 | return rd_load_image("/dev/root"); |
295 | } | |
296 | ||
1da177e4 | 297 | static int exit_code; |
30d65dbf | 298 | static int decompress_error; |
1da177e4 LT |
299 | static int crd_infd, crd_outfd; |
300 | ||
30d65dbf | 301 | static int __init compr_fill(void *buf, unsigned int len) |
1da177e4 | 302 | { |
30d65dbf AK |
303 | int r = sys_read(crd_infd, buf, len); |
304 | if (r < 0) | |
305 | printk(KERN_ERR "RAMDISK: error while reading compressed data"); | |
306 | else if (r == 0) | |
307 | printk(KERN_ERR "RAMDISK: EOF while reading compressed data"); | |
308 | return r; | |
1da177e4 LT |
309 | } |
310 | ||
30d65dbf | 311 | static int __init compr_flush(void *window, unsigned int outcnt) |
1da177e4 | 312 | { |
30d65dbf AK |
313 | int written = sys_write(crd_outfd, window, outcnt); |
314 | if (written != outcnt) { | |
315 | if (decompress_error == 0) | |
316 | printk(KERN_ERR | |
317 | "RAMDISK: incomplete write (%d != %d)\n", | |
318 | written, outcnt); | |
319 | decompress_error = 1; | |
320 | return -1; | |
321 | } | |
322 | return outcnt; | |
1da177e4 LT |
323 | } |
324 | ||
325 | static void __init error(char *x) | |
326 | { | |
327 | printk(KERN_ERR "%s\n", x); | |
328 | exit_code = 1; | |
30d65dbf | 329 | decompress_error = 1; |
1da177e4 LT |
330 | } |
331 | ||
30d65dbf | 332 | static int __init crd_load(int in_fd, int out_fd, decompress_fn deco) |
1da177e4 LT |
333 | { |
334 | int result; | |
1da177e4 LT |
335 | crd_infd = in_fd; |
336 | crd_outfd = out_fd; | |
30d65dbf AK |
337 | result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error); |
338 | if (decompress_error) | |
1da177e4 | 339 | result = 1; |
1da177e4 LT |
340 | return result; |
341 | } |