Root/
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 |
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> |
19 | #include <linux/slab.h> |
20 | |
21 | #include "do_mounts.h" |
22 | #include "../fs/squashfs/squashfs_fs.h" |
23 | |
24 | #include <linux/decompress/generic.h> |
25 | |
26 | |
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 | |
45 | static int __init crd_load(int in_fd, int out_fd, decompress_fn deco); |
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: |
54 | * minix |
55 | * ext2 |
56 | * romfs |
57 | * cramfs |
58 | * squashfs |
59 | * gzip |
60 | */ |
61 | static int __init |
62 | identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) |
63 | { |
64 | const int size = 512; |
65 | struct minix_super_block *minixsb; |
66 | struct romfs_super_block *romfsb; |
67 | struct cramfs_super *cramfsb; |
68 | struct squashfs_super_block *squashfsb; |
69 | int nblocks = -1; |
70 | unsigned char *buf; |
71 | const char *compress_name; |
72 | unsigned long n; |
73 | |
74 | buf = kmalloc(size, GFP_KERNEL); |
75 | if (!buf) |
76 | return -ENOMEM; |
77 | |
78 | minixsb = (struct minix_super_block *) buf; |
79 | romfsb = (struct romfs_super_block *) buf; |
80 | cramfsb = (struct cramfs_super *) buf; |
81 | squashfsb = (struct squashfs_super_block *) buf; |
82 | memset(buf, 0xe5, size); |
83 | |
84 | /* |
85 | * Read block 0 to test for compressed kernel |
86 | */ |
87 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); |
88 | sys_read(fd, buf, size); |
89 | |
90 | *decompressor = decompress_method(buf, size, &compress_name); |
91 | if (compress_name) { |
92 | printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n", |
93 | compress_name, start_block); |
94 | if (!*decompressor) |
95 | printk(KERN_EMERG |
96 | "RAMDISK: %s decompressor not configured!\n", |
97 | compress_name); |
98 | nblocks = 0; |
99 | goto done; |
100 | } |
101 | |
102 | /* romfs is at block zero too */ |
103 | if (romfsb->word0 == ROMSB_WORD0 && |
104 | romfsb->word1 == ROMSB_WORD1) { |
105 | printk(KERN_NOTICE |
106 | "RAMDISK: romfs filesystem found at block %d\n", |
107 | start_block); |
108 | nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; |
109 | goto done; |
110 | } |
111 | |
112 | if (cramfsb->magic == CRAMFS_MAGIC) { |
113 | printk(KERN_NOTICE |
114 | "RAMDISK: cramfs filesystem found at block %d\n", |
115 | start_block); |
116 | nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; |
117 | goto done; |
118 | } |
119 | |
120 | /* squashfs is at block zero too */ |
121 | if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) { |
122 | printk(KERN_NOTICE |
123 | "RAMDISK: squashfs filesystem found at block %d\n", |
124 | start_block); |
125 | nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1) |
126 | >> BLOCK_SIZE_BITS; |
127 | goto done; |
128 | } |
129 | |
130 | /* |
131 | * Read 512 bytes further to check if cramfs is padded |
132 | */ |
133 | sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0); |
134 | sys_read(fd, buf, size); |
135 | |
136 | if (cramfsb->magic == CRAMFS_MAGIC) { |
137 | printk(KERN_NOTICE |
138 | "RAMDISK: cramfs filesystem found at block %d\n", |
139 | start_block); |
140 | nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; |
141 | goto done; |
142 | } |
143 | |
144 | /* |
145 | * Read block 1 to test for minix and ext2 superblock |
146 | */ |
147 | sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0); |
148 | sys_read(fd, buf, size); |
149 | |
150 | /* Try minix */ |
151 | if (minixsb->s_magic == MINIX_SUPER_MAGIC || |
152 | minixsb->s_magic == MINIX_SUPER_MAGIC2) { |
153 | printk(KERN_NOTICE |
154 | "RAMDISK: Minix filesystem found at block %d\n", |
155 | start_block); |
156 | nblocks = minixsb->s_nzones << minixsb->s_log_zone_size; |
157 | goto done; |
158 | } |
159 | |
160 | /* Try ext2 */ |
161 | n = ext2_image_size(buf); |
162 | if (n) { |
163 | printk(KERN_NOTICE |
164 | "RAMDISK: ext2 filesystem found at block %d\n", |
165 | start_block); |
166 | nblocks = n; |
167 | goto done; |
168 | } |
169 | |
170 | printk(KERN_NOTICE |
171 | "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n", |
172 | start_block); |
173 | |
174 | done: |
175 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); |
176 | kfree(buf); |
177 | return nblocks; |
178 | } |
179 | |
180 | int __init rd_load_image(char *from) |
181 | { |
182 | int res = 0; |
183 | int in_fd, out_fd; |
184 | unsigned long rd_blocks, devblocks; |
185 | int nblocks, i, disk; |
186 | char *buf = NULL; |
187 | unsigned short rotate = 0; |
188 | decompress_fn decompressor = NULL; |
189 | #if !defined(CONFIG_S390) |
190 | char rotator[4] = { '|' , '/' , '-' , '\\' }; |
191 | #endif |
192 | |
193 | out_fd = sys_open("/dev/ram", O_RDWR, 0); |
194 | if (out_fd < 0) |
195 | goto out; |
196 | |
197 | in_fd = sys_open(from, O_RDONLY, 0); |
198 | if (in_fd < 0) |
199 | goto noclose_input; |
200 | |
201 | nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor); |
202 | if (nblocks < 0) |
203 | goto done; |
204 | |
205 | if (nblocks == 0) { |
206 | if (crd_load(in_fd, out_fd, decompressor) == 0) |
207 | goto successful_load; |
208 | goto done; |
209 | } |
210 | |
211 | /* |
212 | * NOTE NOTE: nblocks is not actually blocks but |
213 | * the number of kibibytes of data to load into a ramdisk. |
214 | * So any ramdisk block size that is a multiple of 1KiB should |
215 | * work when the appropriate ramdisk_blocksize is specified |
216 | * on the command line. |
217 | * |
218 | * The default ramdisk_blocksize is 1KiB and it is generally |
219 | * silly to use anything else, so make sure to use 1KiB |
220 | * blocksize while generating ext2fs ramdisk-images. |
221 | */ |
222 | if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0) |
223 | rd_blocks = 0; |
224 | else |
225 | rd_blocks >>= 1; |
226 | |
227 | if (nblocks > rd_blocks) { |
228 | printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n", |
229 | nblocks, rd_blocks); |
230 | goto done; |
231 | } |
232 | |
233 | /* |
234 | * OK, time to copy in the data |
235 | */ |
236 | if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0) |
237 | devblocks = 0; |
238 | else |
239 | devblocks >>= 1; |
240 | |
241 | if (strcmp(from, "/initrd.image") == 0) |
242 | devblocks = nblocks; |
243 | |
244 | if (devblocks == 0) { |
245 | printk(KERN_ERR "RAMDISK: could not determine device size\n"); |
246 | goto done; |
247 | } |
248 | |
249 | buf = kmalloc(BLOCK_SIZE, GFP_KERNEL); |
250 | if (!buf) { |
251 | printk(KERN_ERR "RAMDISK: could not allocate buffer\n"); |
252 | goto done; |
253 | } |
254 | |
255 | printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ", |
256 | nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : ""); |
257 | for (i = 0, disk = 1; i < nblocks; i++) { |
258 | if (i && (i % devblocks == 0)) { |
259 | printk("done disk #%d.\n", disk++); |
260 | rotate = 0; |
261 | if (sys_close(in_fd)) { |
262 | printk("Error closing the disk.\n"); |
263 | goto noclose_input; |
264 | } |
265 | change_floppy("disk #%d", disk); |
266 | in_fd = sys_open(from, O_RDONLY, 0); |
267 | if (in_fd < 0) { |
268 | printk("Error opening disk.\n"); |
269 | goto noclose_input; |
270 | } |
271 | printk("Loading disk #%d... ", disk); |
272 | } |
273 | sys_read(in_fd, buf, BLOCK_SIZE); |
274 | sys_write(out_fd, buf, BLOCK_SIZE); |
275 | #if !defined(CONFIG_S390) |
276 | if (!(i % 16)) { |
277 | printk("%c\b", rotator[rotate & 0x3]); |
278 | rotate++; |
279 | } |
280 | #endif |
281 | } |
282 | printk("done.\n"); |
283 | |
284 | successful_load: |
285 | res = 1; |
286 | done: |
287 | sys_close(in_fd); |
288 | noclose_input: |
289 | sys_close(out_fd); |
290 | out: |
291 | kfree(buf); |
292 | sys_unlink("/dev/ram"); |
293 | return res; |
294 | } |
295 | |
296 | int __init rd_load_disk(int n) |
297 | { |
298 | if (rd_prompt) |
299 | change_floppy("root floppy disk to be loaded into RAM disk"); |
300 | create_dev("/dev/root", ROOT_DEV); |
301 | create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n)); |
302 | return rd_load_image("/dev/root"); |
303 | } |
304 | |
305 | static int exit_code; |
306 | static int decompress_error; |
307 | static int crd_infd, crd_outfd; |
308 | |
309 | static int __init compr_fill(void *buf, unsigned int len) |
310 | { |
311 | int r = sys_read(crd_infd, buf, len); |
312 | if (r < 0) |
313 | printk(KERN_ERR "RAMDISK: error while reading compressed data"); |
314 | else if (r == 0) |
315 | printk(KERN_ERR "RAMDISK: EOF while reading compressed data"); |
316 | return r; |
317 | } |
318 | |
319 | static int __init compr_flush(void *window, unsigned int outcnt) |
320 | { |
321 | int written = sys_write(crd_outfd, window, outcnt); |
322 | if (written != outcnt) { |
323 | if (decompress_error == 0) |
324 | printk(KERN_ERR |
325 | "RAMDISK: incomplete write (%d != %d)\n", |
326 | written, outcnt); |
327 | decompress_error = 1; |
328 | return -1; |
329 | } |
330 | return outcnt; |
331 | } |
332 | |
333 | static void __init error(char *x) |
334 | { |
335 | printk(KERN_ERR "%s\n", x); |
336 | exit_code = 1; |
337 | decompress_error = 1; |
338 | } |
339 | |
340 | static int __init crd_load(int in_fd, int out_fd, decompress_fn deco) |
341 | { |
342 | int result; |
343 | crd_infd = in_fd; |
344 | crd_outfd = out_fd; |
345 | result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error); |
346 | if (decompress_error) |
347 | result = 1; |
348 | return result; |
349 | } |
350 |
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