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1da177e Linux-2.6.12-rc2
Linus Torvalds authored
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"
b8fed87 @plougher Squashfs: initrd support
plougher authored
12 #include "../fs/squashfs/squashfs_fs.h"
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
13
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
14 #include <linux/decompress/generic.h>
15
16
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
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
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Alain Knaff authored
35 static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
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:
b172fd8 bzip2/lzma: use a table to search for initramfs compression formats
H. Peter Anvin authored
44 * minix
45 * ext2
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
46 * romfs
47 * cramfs
b8fed87 @plougher Squashfs: initrd support
plougher authored
48 * squashfs
b172fd8 bzip2/lzma: use a table to search for initramfs compression formats
H. Peter Anvin authored
49 * gzip
1da177e Linux-2.6.12-rc2
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50 */
b172fd8 bzip2/lzma: use a table to search for initramfs compression formats
H. Peter Anvin authored
51 static int __init
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
52 identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
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;
b8fed87 @plougher Squashfs: initrd support
plougher authored
59 struct squashfs_super_block *squashfsb;
1da177e Linux-2.6.12-rc2
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60 int nblocks = -1;
61 unsigned char *buf;
889c92d bzip2/lzma: centralize format detection
H. Peter Anvin authored
62 const char *compress_name;
1da177e Linux-2.6.12-rc2
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63
64 buf = kmalloc(size, GFP_KERNEL);
c80544d sparse pointer use of zero as null
Stephen Hemminger authored
65 if (!buf)
1da177e Linux-2.6.12-rc2
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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;
b8fed87 @plougher Squashfs: initrd support
plougher authored
72 squashfsb = (struct squashfs_super_block *) buf;
1da177e Linux-2.6.12-rc2
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73 memset(buf, 0xe5, size);
74
75 /*
b172fd8 bzip2/lzma: use a table to search for initramfs compression formats
H. Peter Anvin authored
76 * Read block 0 to test for compressed kernel
1da177e Linux-2.6.12-rc2
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77 */
78 sys_lseek(fd, start_block * BLOCK_SIZE, 0);
79 sys_read(fd, buf, size);
80
889c92d bzip2/lzma: centralize format detection
H. Peter Anvin authored
81 *decompressor = decompress_method(buf, size, &compress_name);
23a22d5 bzip2/lzma: comprehensible error messages for missing decompressor
H. Peter Anvin authored
82 if (compress_name) {
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83 printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n",
84 compress_name, start_block);
23a22d5 bzip2/lzma: comprehensible error messages for missing decompressor
H. Peter Anvin authored
85 if (!*decompressor)
86 printk(KERN_CRIT "RAMDISK: %s decompressor not configured!\n",
87 compress_name);
889c92d bzip2/lzma: centralize format detection
H. Peter Anvin authored
88 nblocks = 0;
89 goto done;
1da177e Linux-2.6.12-rc2
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90 }
91
92 /* romfs is at block zero too */
93 if (romfsb->word0 == ROMSB_WORD0 &&
94 romfsb->word1 == ROMSB_WORD1) {
95 printk(KERN_NOTICE
96 "RAMDISK: romfs filesystem found at block %d\n",
97 start_block);
98 nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
99 goto done;
100 }
101
102 if (cramfsb->magic == CRAMFS_MAGIC) {
103 printk(KERN_NOTICE
104 "RAMDISK: cramfs filesystem found at block %d\n",
105 start_block);
106 nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
107 goto done;
108 }
109
b8fed87 @plougher Squashfs: initrd support
plougher authored
110 /* squashfs is at block zero too */
111 if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
112 printk(KERN_NOTICE
113 "RAMDISK: squashfs filesystem found at block %d\n",
114 start_block);
115 nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1)
116 >> BLOCK_SIZE_BITS;
117 goto done;
118 }
119
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
120 /*
121 * Read block 1 to test for minix and ext2 superblock
122 */
123 sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
124 sys_read(fd, buf, size);
125
126 /* Try minix */
127 if (minixsb->s_magic == MINIX_SUPER_MAGIC ||
128 minixsb->s_magic == MINIX_SUPER_MAGIC2) {
129 printk(KERN_NOTICE
130 "RAMDISK: Minix filesystem found at block %d\n",
131 start_block);
132 nblocks = minixsb->s_nzones << minixsb->s_log_zone_size;
133 goto done;
134 }
135
136 /* Try ext2 */
137 if (ext2sb->s_magic == cpu_to_le16(EXT2_SUPER_MAGIC)) {
138 printk(KERN_NOTICE
139 "RAMDISK: ext2 filesystem found at block %d\n",
140 start_block);
141 nblocks = le32_to_cpu(ext2sb->s_blocks_count) <<
142 le32_to_cpu(ext2sb->s_log_block_size);
143 goto done;
144 }
145
146 printk(KERN_NOTICE
147 "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n",
148 start_block);
b172fd8 bzip2/lzma: use a table to search for initramfs compression formats
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149
1da177e Linux-2.6.12-rc2
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150 done:
151 sys_lseek(fd, start_block * BLOCK_SIZE, 0);
152 kfree(buf);
153 return nblocks;
154 }
155
156 int __init rd_load_image(char *from)
157 {
158 int res = 0;
159 int in_fd, out_fd;
160 unsigned long rd_blocks, devblocks;
161 int nblocks, i, disk;
162 char *buf = NULL;
163 unsigned short rotate = 0;
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
164 decompress_fn decompressor = NULL;
347a8dc [PATCH] s390: cleanup Kconfig
Martin Schwidefsky authored
165 #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES)
1da177e Linux-2.6.12-rc2
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166 char rotator[4] = { '|' , '/' , '-' , '\\' };
167 #endif
168
169 out_fd = sys_open("/dev/ram", O_RDWR, 0);
170 if (out_fd < 0)
171 goto out;
172
173 in_fd = sys_open(from, O_RDONLY, 0);
174 if (in_fd < 0)
175 goto noclose_input;
176
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
177 nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor);
1da177e Linux-2.6.12-rc2
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178 if (nblocks < 0)
179 goto done;
180
181 if (nblocks == 0) {
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
182 if (crd_load(in_fd, out_fd, decompressor) == 0)
1da177e Linux-2.6.12-rc2
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183 goto successful_load;
184 goto done;
185 }
186
187 /*
188 * NOTE NOTE: nblocks is not actually blocks but
189 * the number of kibibytes of data to load into a ramdisk.
190 * So any ramdisk block size that is a multiple of 1KiB should
191 * work when the appropriate ramdisk_blocksize is specified
192 * on the command line.
193 *
194 * The default ramdisk_blocksize is 1KiB and it is generally
195 * silly to use anything else, so make sure to use 1KiB
196 * blocksize while generating ext2fs ramdisk-images.
197 */
198 if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
199 rd_blocks = 0;
200 else
201 rd_blocks >>= 1;
202
203 if (nblocks > rd_blocks) {
204 printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n",
205 nblocks, rd_blocks);
206 goto done;
207 }
b172fd8 bzip2/lzma: use a table to search for initramfs compression formats
H. Peter Anvin authored
208
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
209 /*
210 * OK, time to copy in the data
211 */
212 if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0)
213 devblocks = 0;
214 else
215 devblocks >>= 1;
216
217 if (strcmp(from, "/initrd.image") == 0)
218 devblocks = nblocks;
219
220 if (devblocks == 0) {
221 printk(KERN_ERR "RAMDISK: could not determine device size\n");
222 goto done;
223 }
224
225 buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
d613c3e @hharrison init: fix integer as NULL pointer warnings
hharrison authored
226 if (!buf) {
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
227 printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
228 goto done;
229 }
230
231 printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ",
232 nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
233 for (i = 0, disk = 1; i < nblocks; i++) {
234 if (i && (i % devblocks == 0)) {
235 printk("done disk #%d.\n", disk++);
236 rotate = 0;
237 if (sys_close(in_fd)) {
238 printk("Error closing the disk.\n");
239 goto noclose_input;
240 }
241 change_floppy("disk #%d", disk);
242 in_fd = sys_open(from, O_RDONLY, 0);
243 if (in_fd < 0) {
244 printk("Error opening disk.\n");
245 goto noclose_input;
246 }
247 printk("Loading disk #%d... ", disk);
248 }
249 sys_read(in_fd, buf, BLOCK_SIZE);
250 sys_write(out_fd, buf, BLOCK_SIZE);
347a8dc [PATCH] s390: cleanup Kconfig
Martin Schwidefsky authored
251 #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES)
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
252 if (!(i % 16)) {
253 printk("%c\b", rotator[rotate & 0x3]);
254 rotate++;
255 }
256 #endif
257 }
258 printk("done.\n");
259
260 successful_load:
261 res = 1;
262 done:
263 sys_close(in_fd);
264 noclose_input:
265 sys_close(out_fd);
266 out:
267 kfree(buf);
268 sys_unlink("/dev/ram");
269 return res;
270 }
271
272 int __init rd_load_disk(int n)
273 {
274 if (rd_prompt)
275 change_floppy("root floppy disk to be loaded into RAM disk");
bdaf852 @gregkh [PATCH] devfs: Remove devfs from the init code
gregkh authored
276 create_dev("/dev/root", ROOT_DEV);
277 create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
278 return rd_load_image("/dev/root");
279 }
280
281 static int exit_code;
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
282 static int decompress_error;
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
283 static int crd_infd, crd_outfd;
284
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
285 static int __init compr_fill(void *buf, unsigned int len)
1da177e Linux-2.6.12-rc2
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286 {
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
287 int r = sys_read(crd_infd, buf, len);
288 if (r < 0)
289 printk(KERN_ERR "RAMDISK: error while reading compressed data");
290 else if (r == 0)
291 printk(KERN_ERR "RAMDISK: EOF while reading compressed data");
292 return r;
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
293 }
294
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
295 static int __init compr_flush(void *window, unsigned int outcnt)
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
296 {
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
297 int written = sys_write(crd_outfd, window, outcnt);
298 if (written != outcnt) {
299 if (decompress_error == 0)
300 printk(KERN_ERR
301 "RAMDISK: incomplete write (%d != %d)\n",
302 written, outcnt);
303 decompress_error = 1;
304 return -1;
305 }
306 return outcnt;
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
307 }
308
309 static void __init error(char *x)
310 {
311 printk(KERN_ERR "%s\n", x);
312 exit_code = 1;
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
313 decompress_error = 1;
1da177e Linux-2.6.12-rc2
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314 }
315
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
316 static int __init crd_load(int in_fd, int out_fd, decompress_fn deco)
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
317 {
318 int result;
319 crd_infd = in_fd;
320 crd_outfd = out_fd;
30d65db bzip2/lzma: config and initramfs support for bzip2/lzma decompression
Alain Knaff authored
321 result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error);
322 if (decompress_error)
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
323 result = 1;
324 return result;
325 }
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