Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 13 | #include <linux/decompress/generic.h> |
| 14 | |
| 15 | #include <linux/decompress/bunzip2.h> |
| 16 | #include <linux/decompress/unlzma.h> |
| 17 | #include <linux/decompress/inflate.h> |
| 18 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */ |
| 20 | |
| 21 | static int __init prompt_ramdisk(char *str) |
| 22 | { |
| 23 | rd_prompt = simple_strtol(str,NULL,0) & 1; |
| 24 | return 1; |
| 25 | } |
| 26 | __setup("prompt_ramdisk=", prompt_ramdisk); |
| 27 | |
| 28 | int __initdata rd_image_start; /* starting block # of image */ |
| 29 | |
| 30 | static int __init ramdisk_start_setup(char *str) |
| 31 | { |
| 32 | rd_image_start = simple_strtol(str,NULL,0); |
| 33 | return 1; |
| 34 | } |
| 35 | __setup("ramdisk_start=", ramdisk_start_setup); |
| 36 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 37 | static int __init crd_load(int in_fd, int out_fd, decompress_fn deco); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | /* |
| 40 | * This routine tries to find a RAM disk image to load, and returns the |
| 41 | * number of blocks to read for a non-compressed image, 0 if the image |
| 42 | * is a compressed image, and -1 if an image with the right magic |
| 43 | * numbers could not be found. |
| 44 | * |
| 45 | * We currently check for the following magic numbers: |
| 46 | * minix |
| 47 | * ext2 |
| 48 | * romfs |
| 49 | * cramfs |
| 50 | * gzip |
| 51 | */ |
| 52 | static int __init |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 53 | identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | int nblocks = -1; |
| 61 | unsigned char *buf; |
| 62 | |
| 63 | buf = kmalloc(size, GFP_KERNEL); |
Stephen Hemminger | c80544d | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 64 | if (!buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | return -1; |
| 66 | |
| 67 | minixsb = (struct minix_super_block *) buf; |
| 68 | ext2sb = (struct ext2_super_block *) buf; |
| 69 | romfsb = (struct romfs_super_block *) buf; |
| 70 | cramfsb = (struct cramfs_super *) buf; |
| 71 | memset(buf, 0xe5, size); |
| 72 | |
| 73 | /* |
| 74 | * Read block 0 to test for gzipped kernel |
| 75 | */ |
| 76 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); |
| 77 | sys_read(fd, buf, size); |
| 78 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 79 | #ifdef CONFIG_RD_GZIP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | /* |
Geert Uytterhoeven | 93fd85d | 2008-10-15 22:01:32 -0700 | [diff] [blame] | 81 | * If it matches the gzip magic numbers, return 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | */ |
| 83 | if (buf[0] == 037 && ((buf[1] == 0213) || (buf[1] == 0236))) { |
| 84 | printk(KERN_NOTICE |
| 85 | "RAMDISK: Compressed image found at block %d\n", |
| 86 | start_block); |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 87 | *decompressor = gunzip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | nblocks = 0; |
| 89 | goto done; |
| 90 | } |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 91 | #endif |
| 92 | |
| 93 | #ifdef CONFIG_RD_BZIP2 |
| 94 | /* |
| 95 | * If it matches the bzip2 magic numbers, return -1 |
| 96 | */ |
| 97 | if (buf[0] == 0x42 && (buf[1] == 0x5a)) { |
| 98 | printk(KERN_NOTICE |
| 99 | "RAMDISK: Bzipped image found at block %d\n", |
| 100 | start_block); |
| 101 | *decompressor = bunzip2; |
| 102 | nblocks = 0; |
| 103 | goto done; |
| 104 | } |
| 105 | #endif |
| 106 | |
| 107 | #ifdef CONFIG_RD_LZMA |
| 108 | /* |
| 109 | * If it matches the lzma magic numbers, return -1 |
| 110 | */ |
| 111 | if (buf[0] == 0x5d && (buf[1] == 0x00)) { |
| 112 | printk(KERN_NOTICE |
| 113 | "RAMDISK: Lzma image found at block %d\n", |
| 114 | start_block); |
| 115 | *decompressor = unlzma; |
| 116 | nblocks = 0; |
| 117 | goto done; |
| 118 | } |
| 119 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | /* romfs is at block zero too */ |
| 122 | if (romfsb->word0 == ROMSB_WORD0 && |
| 123 | romfsb->word1 == ROMSB_WORD1) { |
| 124 | printk(KERN_NOTICE |
| 125 | "RAMDISK: romfs filesystem found at block %d\n", |
| 126 | start_block); |
| 127 | nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; |
| 128 | goto done; |
| 129 | } |
| 130 | |
| 131 | if (cramfsb->magic == CRAMFS_MAGIC) { |
| 132 | printk(KERN_NOTICE |
| 133 | "RAMDISK: cramfs filesystem found at block %d\n", |
| 134 | start_block); |
| 135 | nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; |
| 136 | goto done; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Read block 1 to test for minix and ext2 superblock |
| 141 | */ |
| 142 | sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0); |
| 143 | sys_read(fd, buf, size); |
| 144 | |
| 145 | /* Try minix */ |
| 146 | if (minixsb->s_magic == MINIX_SUPER_MAGIC || |
| 147 | minixsb->s_magic == MINIX_SUPER_MAGIC2) { |
| 148 | printk(KERN_NOTICE |
| 149 | "RAMDISK: Minix filesystem found at block %d\n", |
| 150 | start_block); |
| 151 | nblocks = minixsb->s_nzones << minixsb->s_log_zone_size; |
| 152 | goto done; |
| 153 | } |
| 154 | |
| 155 | /* Try ext2 */ |
| 156 | if (ext2sb->s_magic == cpu_to_le16(EXT2_SUPER_MAGIC)) { |
| 157 | printk(KERN_NOTICE |
| 158 | "RAMDISK: ext2 filesystem found at block %d\n", |
| 159 | start_block); |
| 160 | nblocks = le32_to_cpu(ext2sb->s_blocks_count) << |
| 161 | le32_to_cpu(ext2sb->s_log_block_size); |
| 162 | goto done; |
| 163 | } |
| 164 | |
| 165 | printk(KERN_NOTICE |
| 166 | "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n", |
| 167 | start_block); |
| 168 | |
| 169 | done: |
| 170 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); |
| 171 | kfree(buf); |
| 172 | return nblocks; |
| 173 | } |
| 174 | |
| 175 | int __init rd_load_image(char *from) |
| 176 | { |
| 177 | int res = 0; |
| 178 | int in_fd, out_fd; |
| 179 | unsigned long rd_blocks, devblocks; |
| 180 | int nblocks, i, disk; |
| 181 | char *buf = NULL; |
| 182 | unsigned short rotate = 0; |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 183 | decompress_fn decompressor = NULL; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 184 | #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | char rotator[4] = { '|' , '/' , '-' , '\\' }; |
| 186 | #endif |
| 187 | |
| 188 | out_fd = sys_open("/dev/ram", O_RDWR, 0); |
| 189 | if (out_fd < 0) |
| 190 | goto out; |
| 191 | |
| 192 | in_fd = sys_open(from, O_RDONLY, 0); |
| 193 | if (in_fd < 0) |
| 194 | goto noclose_input; |
| 195 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 196 | nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | if (nblocks < 0) |
| 198 | goto done; |
| 199 | |
| 200 | if (nblocks == 0) { |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 201 | if (crd_load(in_fd, out_fd, decompressor) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | goto successful_load; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | goto done; |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | * NOTE NOTE: nblocks is not actually blocks but |
| 208 | * the number of kibibytes of data to load into a ramdisk. |
| 209 | * So any ramdisk block size that is a multiple of 1KiB should |
| 210 | * work when the appropriate ramdisk_blocksize is specified |
| 211 | * on the command line. |
| 212 | * |
| 213 | * The default ramdisk_blocksize is 1KiB and it is generally |
| 214 | * silly to use anything else, so make sure to use 1KiB |
| 215 | * blocksize while generating ext2fs ramdisk-images. |
| 216 | */ |
| 217 | if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0) |
| 218 | rd_blocks = 0; |
| 219 | else |
| 220 | rd_blocks >>= 1; |
| 221 | |
| 222 | if (nblocks > rd_blocks) { |
| 223 | printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n", |
| 224 | nblocks, rd_blocks); |
| 225 | goto done; |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | * OK, time to copy in the data |
| 230 | */ |
| 231 | if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0) |
| 232 | devblocks = 0; |
| 233 | else |
| 234 | devblocks >>= 1; |
| 235 | |
| 236 | if (strcmp(from, "/initrd.image") == 0) |
| 237 | devblocks = nblocks; |
| 238 | |
| 239 | if (devblocks == 0) { |
| 240 | printk(KERN_ERR "RAMDISK: could not determine device size\n"); |
| 241 | goto done; |
| 242 | } |
| 243 | |
| 244 | buf = kmalloc(BLOCK_SIZE, GFP_KERNEL); |
Harvey Harrison | d613c3e | 2008-04-28 14:13:14 -0700 | [diff] [blame] | 245 | if (!buf) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | printk(KERN_ERR "RAMDISK: could not allocate buffer\n"); |
| 247 | goto done; |
| 248 | } |
| 249 | |
| 250 | printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ", |
| 251 | nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : ""); |
| 252 | for (i = 0, disk = 1; i < nblocks; i++) { |
| 253 | if (i && (i % devblocks == 0)) { |
| 254 | printk("done disk #%d.\n", disk++); |
| 255 | rotate = 0; |
| 256 | if (sys_close(in_fd)) { |
| 257 | printk("Error closing the disk.\n"); |
| 258 | goto noclose_input; |
| 259 | } |
| 260 | change_floppy("disk #%d", disk); |
| 261 | in_fd = sys_open(from, O_RDONLY, 0); |
| 262 | if (in_fd < 0) { |
| 263 | printk("Error opening disk.\n"); |
| 264 | goto noclose_input; |
| 265 | } |
| 266 | printk("Loading disk #%d... ", disk); |
| 267 | } |
| 268 | sys_read(in_fd, buf, BLOCK_SIZE); |
| 269 | sys_write(out_fd, buf, BLOCK_SIZE); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 270 | #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | if (!(i % 16)) { |
| 272 | printk("%c\b", rotator[rotate & 0x3]); |
| 273 | rotate++; |
| 274 | } |
| 275 | #endif |
| 276 | } |
| 277 | printk("done.\n"); |
| 278 | |
| 279 | successful_load: |
| 280 | res = 1; |
| 281 | done: |
| 282 | sys_close(in_fd); |
| 283 | noclose_input: |
| 284 | sys_close(out_fd); |
| 285 | out: |
| 286 | kfree(buf); |
| 287 | sys_unlink("/dev/ram"); |
| 288 | return res; |
| 289 | } |
| 290 | |
| 291 | int __init rd_load_disk(int n) |
| 292 | { |
| 293 | if (rd_prompt) |
| 294 | change_floppy("root floppy disk to be loaded into RAM disk"); |
Greg Kroah-Hartman | bdaf852 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 295 | create_dev("/dev/root", ROOT_DEV); |
| 296 | create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | return rd_load_image("/dev/root"); |
| 298 | } |
| 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | static int exit_code; |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 301 | static int decompress_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | static int crd_infd, crd_outfd; |
| 303 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 304 | static int __init compr_fill(void *buf, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | { |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 306 | int r = sys_read(crd_infd, buf, len); |
| 307 | if (r < 0) |
| 308 | printk(KERN_ERR "RAMDISK: error while reading compressed data"); |
| 309 | else if (r == 0) |
| 310 | printk(KERN_ERR "RAMDISK: EOF while reading compressed data"); |
| 311 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | } |
| 313 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 314 | static int __init compr_flush(void *window, unsigned int outcnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | { |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 316 | int written = sys_write(crd_outfd, window, outcnt); |
| 317 | if (written != outcnt) { |
| 318 | if (decompress_error == 0) |
| 319 | printk(KERN_ERR |
| 320 | "RAMDISK: incomplete write (%d != %d)\n", |
| 321 | written, outcnt); |
| 322 | decompress_error = 1; |
| 323 | return -1; |
| 324 | } |
| 325 | return outcnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | static void __init error(char *x) |
| 329 | { |
| 330 | printk(KERN_ERR "%s\n", x); |
| 331 | exit_code = 1; |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 332 | decompress_error = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 335 | static int __init crd_load(int in_fd, int out_fd, decompress_fn deco) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | { |
| 337 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | crd_infd = in_fd; |
| 339 | crd_outfd = out_fd; |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame^] | 340 | result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error); |
| 341 | if (decompress_error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | result = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | return result; |
| 344 | } |