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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 | #include <linux/slab.h> |
11 | |
12 | #include "do_mounts.h" |
13 | #include "../fs/squashfs/squashfs_fs.h" |
14 | |
15 | #include <linux/decompress/generic.h> |
16 | |
17 | |
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 | |
36 | static int __init crd_load(int in_fd, int out_fd, decompress_fn deco); |
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: |
45 | * minix |
46 | * ext2 |
47 | * romfs |
48 | * cramfs |
49 | * squashfs |
50 | * gzip |
51 | */ |
52 | static int __init |
53 | identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) |
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; |
60 | struct squashfs_super_block *squashfsb; |
61 | int nblocks = -1; |
62 | unsigned char *buf; |
63 | const char *compress_name; |
64 | |
65 | buf = kmalloc(size, GFP_KERNEL); |
66 | if (!buf) |
67 | return -ENOMEM; |
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; |
73 | squashfsb = (struct squashfs_super_block *) buf; |
74 | memset(buf, 0xe5, size); |
75 | |
76 | /* |
77 | * Read block 0 to test for compressed kernel |
78 | */ |
79 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); |
80 | sys_read(fd, buf, size); |
81 | |
82 | *decompressor = decompress_method(buf, size, &compress_name); |
83 | if (compress_name) { |
84 | printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n", |
85 | compress_name, start_block); |
86 | if (!*decompressor) |
87 | printk(KERN_EMERG |
88 | "RAMDISK: %s decompressor not configured!\n", |
89 | compress_name); |
90 | nblocks = 0; |
91 | goto done; |
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 | |
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 | |
122 | /* |
123 | * Read block 1 to test for minix and ext2 superblock |
124 | */ |
125 | sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0); |
126 | sys_read(fd, buf, size); |
127 | |
128 | /* Try minix */ |
129 | if (minixsb->s_magic == MINIX_SUPER_MAGIC || |
130 | minixsb->s_magic == MINIX_SUPER_MAGIC2) { |
131 | printk(KERN_NOTICE |
132 | "RAMDISK: Minix filesystem found at block %d\n", |
133 | start_block); |
134 | nblocks = minixsb->s_nzones << minixsb->s_log_zone_size; |
135 | goto done; |
136 | } |
137 | |
138 | /* Try ext2 */ |
139 | if (ext2sb->s_magic == cpu_to_le16(EXT2_SUPER_MAGIC)) { |
140 | printk(KERN_NOTICE |
141 | "RAMDISK: ext2 filesystem found at block %d\n", |
142 | start_block); |
143 | nblocks = le32_to_cpu(ext2sb->s_blocks_count) << |
144 | le32_to_cpu(ext2sb->s_log_block_size); |
145 | goto done; |
146 | } |
147 | |
148 | printk(KERN_NOTICE |
149 | "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n", |
150 | start_block); |
151 | |
152 | done: |
153 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); |
154 | kfree(buf); |
155 | return nblocks; |
156 | } |
157 | |
158 | int __init rd_load_image(char *from) |
159 | { |
160 | int res = 0; |
161 | int in_fd, out_fd; |
162 | unsigned long rd_blocks, devblocks; |
163 | int nblocks, i, disk; |
164 | char *buf = NULL; |
165 | unsigned short rotate = 0; |
166 | decompress_fn decompressor = NULL; |
167 | #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES) |
168 | char rotator[4] = { '|' , '/' , '-' , '\\' }; |
169 | #endif |
170 | |
171 | out_fd = sys_open((const char __user __force *) "/dev/ram", O_RDWR, 0); |
172 | if (out_fd < 0) |
173 | goto out; |
174 | |
175 | in_fd = sys_open(from, O_RDONLY, 0); |
176 | if (in_fd < 0) |
177 | goto noclose_input; |
178 | |
179 | nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor); |
180 | if (nblocks < 0) |
181 | goto done; |
182 | |
183 | if (nblocks == 0) { |
184 | if (crd_load(in_fd, out_fd, decompressor) == 0) |
185 | goto successful_load; |
186 | goto done; |
187 | } |
188 | |
189 | /* |
190 | * NOTE NOTE: nblocks is not actually blocks but |
191 | * the number of kibibytes of data to load into a ramdisk. |
192 | * So any ramdisk block size that is a multiple of 1KiB should |
193 | * work when the appropriate ramdisk_blocksize is specified |
194 | * on the command line. |
195 | * |
196 | * The default ramdisk_blocksize is 1KiB and it is generally |
197 | * silly to use anything else, so make sure to use 1KiB |
198 | * blocksize while generating ext2fs ramdisk-images. |
199 | */ |
200 | if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0) |
201 | rd_blocks = 0; |
202 | else |
203 | rd_blocks >>= 1; |
204 | |
205 | if (nblocks > rd_blocks) { |
206 | printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n", |
207 | nblocks, rd_blocks); |
208 | goto done; |
209 | } |
210 | |
211 | /* |
212 | * OK, time to copy in the data |
213 | */ |
214 | if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0) |
215 | devblocks = 0; |
216 | else |
217 | devblocks >>= 1; |
218 | |
219 | if (strcmp(from, "/initrd.image") == 0) |
220 | devblocks = nblocks; |
221 | |
222 | if (devblocks == 0) { |
223 | printk(KERN_ERR "RAMDISK: could not determine device size\n"); |
224 | goto done; |
225 | } |
226 | |
227 | buf = kmalloc(BLOCK_SIZE, GFP_KERNEL); |
228 | if (!buf) { |
229 | printk(KERN_ERR "RAMDISK: could not allocate buffer\n"); |
230 | goto done; |
231 | } |
232 | |
233 | printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ", |
234 | nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : ""); |
235 | for (i = 0, disk = 1; i < nblocks; i++) { |
236 | if (i && (i % devblocks == 0)) { |
237 | printk("done disk #%d.\n", disk++); |
238 | rotate = 0; |
239 | if (sys_close(in_fd)) { |
240 | printk("Error closing the disk.\n"); |
241 | goto noclose_input; |
242 | } |
243 | change_floppy("disk #%d", disk); |
244 | in_fd = sys_open(from, O_RDONLY, 0); |
245 | if (in_fd < 0) { |
246 | printk("Error opening disk.\n"); |
247 | goto noclose_input; |
248 | } |
249 | printk("Loading disk #%d... ", disk); |
250 | } |
251 | sys_read(in_fd, buf, BLOCK_SIZE); |
252 | sys_write(out_fd, buf, BLOCK_SIZE); |
253 | #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES) |
254 | if (!(i % 16)) { |
255 | printk("%c\b", rotator[rotate & 0x3]); |
256 | rotate++; |
257 | } |
258 | #endif |
259 | } |
260 | printk("done.\n"); |
261 | |
262 | successful_load: |
263 | res = 1; |
264 | done: |
265 | sys_close(in_fd); |
266 | noclose_input: |
267 | sys_close(out_fd); |
268 | out: |
269 | kfree(buf); |
270 | sys_unlink((const char __user __force *) "/dev/ram"); |
271 | return res; |
272 | } |
273 | |
274 | int __init rd_load_disk(int n) |
275 | { |
276 | if (rd_prompt) |
277 | change_floppy("root floppy disk to be loaded into RAM disk"); |
278 | create_dev("/dev/root", ROOT_DEV); |
279 | create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n)); |
280 | return rd_load_image("/dev/root"); |
281 | } |
282 | |
283 | static int exit_code; |
284 | static int decompress_error; |
285 | static int crd_infd, crd_outfd; |
286 | |
287 | static int __init compr_fill(void *buf, unsigned int len) |
288 | { |
289 | int r = sys_read(crd_infd, buf, len); |
290 | if (r < 0) |
291 | printk(KERN_ERR "RAMDISK: error while reading compressed data"); |
292 | else if (r == 0) |
293 | printk(KERN_ERR "RAMDISK: EOF while reading compressed data"); |
294 | return r; |
295 | } |
296 | |
297 | static int __init compr_flush(void *window, unsigned int outcnt) |
298 | { |
299 | int written = sys_write(crd_outfd, window, outcnt); |
300 | if (written != outcnt) { |
301 | if (decompress_error == 0) |
302 | printk(KERN_ERR |
303 | "RAMDISK: incomplete write (%d != %d)\n", |
304 | written, outcnt); |
305 | decompress_error = 1; |
306 | return -1; |
307 | } |
308 | return outcnt; |
309 | } |
310 | |
311 | static void __init error(char *x) |
312 | { |
313 | printk(KERN_ERR "%s\n", x); |
314 | exit_code = 1; |
315 | decompress_error = 1; |
316 | } |
317 | |
318 | static int __init crd_load(int in_fd, int out_fd, decompress_fn deco) |
319 | { |
320 | int result; |
321 | crd_infd = in_fd; |
322 | crd_outfd = out_fd; |
323 | result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error); |
324 | if (decompress_error) |
325 | result = 1; |
326 | return result; |
327 | } |
328 |
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