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