1 #include <linux/module.h> 2 #include <linux/sched.h> 3 #include <linux/ctype.h> 4 #include <linux/fd.h> 5 #include <linux/tty.h> 6 #include <linux/suspend.h> 7 #include <linux/root_dev.h> 8 #include <linux/security.h> 9 #include <linux/delay.h> 10 #include <linux/genhd.h> 11 #include <linux/mount.h> 12 #include <linux/device.h> 13 #include <linux/init.h> 14 15 #include <linux/nfs_fs.h> 16 #include <linux/nfs_fs_sb.h> 17 #include <linux/nfs_mount.h> 18 19 #include "do_mounts.h" 20 21 extern int get_filesystem_list(char * buf); 22 23 int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ 24 25 int root_mountflags = MS_RDONLY | MS_SILENT; 26 char * __initdata root_device_name; 27 static char __initdata saved_root_name[64]; 28 static int __initdata root_wait; 29 30 dev_t ROOT_DEV; 31 32 static int __init load_ramdisk(char *str) 33 { 34 rd_doload = simple_strtol(str,NULL,0) & 3; 35 return 1; 36 } 37 __setup("load_ramdisk=", load_ramdisk); 38 39 static int __init readonly(char *str) 40 { 41 if (*str) 42 return 0; 43 root_mountflags |= MS_RDONLY; 44 return 1; 45 } 46 47 static int __init readwrite(char *str) 48 { 49 if (*str) 50 return 0; 51 root_mountflags &= ~MS_RDONLY; 52 return 1; 53 } 54 55 __setup("ro", readonly); 56 __setup("rw", readwrite); 57 58 static dev_t try_name(char *name, int part) 59 { 60 char path[64]; 61 char buf[32]; 62 int range; 63 dev_t res; 64 char *s; 65 int len; 66 int fd; 67 unsigned int maj, min; 68 69 /* read device number from .../dev */ 70 71 sprintf(path, "/sys/block/%s/dev", name); 72 fd = sys_open(path, 0, 0); 73 if (fd < 0) 74 goto fail; 75 len = sys_read(fd, buf, 32); 76 sys_close(fd); 77 if (len <= 0 || len == 32 || buf[len - 1] != '\n') 78 goto fail; 79 buf[len - 1] = '\0'; 80 if (sscanf(buf, "%u:%u", &maj, &min) == 2) { 81 /* 82 * Try the %u:%u format -- see print_dev_t() 83 */ 84 res = MKDEV(maj, min); 85 if (maj != MAJOR(res) || min != MINOR(res)) 86 goto fail; 87 } else { 88 /* 89 * Nope. Try old-style "0321" 90 */ 91 res = new_decode_dev(simple_strtoul(buf, &s, 16)); 92 if (*s) 93 goto fail; 94 } 95 96 /* if it's there and we are not looking for a partition - that's it */ 97 if (!part) 98 return res; 99 100 /* otherwise read range from .../range */ 101 sprintf(path, "/sys/block/%s/range", name); 102 fd = sys_open(path, 0, 0); 103 if (fd < 0) 104 goto fail; 105 len = sys_read(fd, buf, 32); 106 sys_close(fd); 107 if (len <= 0 || len == 32 || buf[len - 1] != '\n') 108 goto fail; 109 buf[len - 1] = '\0'; 110 range = simple_strtoul(buf, &s, 10); 111 if (*s) 112 goto fail; 113 114 /* if partition is within range - we got it */ 115 if (part < range) 116 return res + part; 117 fail: 118 return 0; 119 } 120 121 /* 122 * Convert a name into device number. We accept the following variants: 123 * 124 * 1) device number in hexadecimal represents itself 125 * 2) /dev/nfs represents Root_NFS (0xff) 126 * 3) /dev/<disk_name> represents the device number of disk 127 * 4) /dev/<disk_name><decimal> represents the device number 128 * of partition - device number of disk plus the partition number 129 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is 130 * used when disk name of partitioned disk ends on a digit. 131 * 132 * If name doesn't have fall into the categories above, we return 0. 133 * Sysfs is used to check if something is a disk name - it has 134 * all known disks under bus/block/devices. If the disk name 135 * contains slashes, name of sysfs node has them replaced with 136 * bangs. try_name() does the actual checks, assuming that sysfs 137 * is mounted on rootfs /sys. 138 */ 139 140 dev_t name_to_dev_t(char *name) 141 { 142 char s[32]; 143 char *p; 144 dev_t res = 0; 145 int part; 146 147 #ifdef CONFIG_SYSFS 148 int mkdir_err = sys_mkdir("/sys", 0700); 149 if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0) 150 goto out; 151 #endif 152 153 if (strncmp(name, "/dev/", 5) != 0) { 154 unsigned maj, min; 155 156 if (sscanf(name, "%u:%u", &maj, &min) == 2) { 157 res = MKDEV(maj, min); 158 if (maj != MAJOR(res) || min != MINOR(res)) 159 goto fail; 160 } else { 161 res = new_decode_dev(simple_strtoul(name, &p, 16)); 162 if (*p) 163 goto fail; 164 } 165 goto done; 166 } 167 name += 5; 168 res = Root_NFS; 169 if (strcmp(name, "nfs") == 0) 170 goto done; 171 res = Root_RAM0; 172 if (strcmp(name, "ram") == 0) 173 goto done; 174 175 if (strlen(name) > 31) 176 goto fail; 177 strcpy(s, name); 178 for (p = s; *p; p++) 179 if (*p == '/') 180 *p = '!'; 181 res = try_name(s, 0); 182 if (res) 183 goto done; 184 185 while (p > s && isdigit(p[-1])) 186 p--; 187 if (p == s || !*p || *p == '0') 188 goto fail; 189 part = simple_strtoul(p, NULL, 10); 190 *p = '\0'; 191 res = try_name(s, part); 192 if (res) 193 goto done; 194 195 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') 196 goto fail; 197 p[-1] = '\0'; 198 res = try_name(s, part); 199 done: 200 #ifdef CONFIG_SYSFS 201 sys_umount("/sys", 0); 202 out: 203 if (!mkdir_err) 204 sys_rmdir("/sys"); 205 #endif 206 return res; 207 fail: 208 res = 0; 209 goto done; 210 } 211 212 static int __init root_dev_setup(char *line) 213 { 214 strlcpy(saved_root_name, line, sizeof(saved_root_name)); 215 return 1; 216 } 217 218 __setup("root=", root_dev_setup); 219 220 static int __init rootwait_setup(char *str) 221 { 222 if (*str) 223 return 0; 224 root_wait = 1; 225 return 1; 226 } 227 228 __setup("rootwait", rootwait_setup); 229 230 static char * __initdata root_mount_data; 231 static int __init root_data_setup(char *str) 232 { 233 root_mount_data = str; 234 return 1; 235 } 236 237 static char * __initdata root_fs_names; 238 static int __init fs_names_setup(char *str) 239 { 240 root_fs_names = str; 241 return 1; 242 } 243 244 static unsigned int __initdata root_delay; 245 static int __init root_delay_setup(char *str) 246 { 247 root_delay = simple_strtoul(str, NULL, 0); 248 return 1; 249 } 250 251 __setup("rootflags=", root_data_setup); 252 __setup("rootfstype=", fs_names_setup); 253 __setup("rootdelay=", root_delay_setup); 254 255 static void __init get_fs_names(char *page) 256 { 257 char *s = page; 258 259 if (root_fs_names) { 260 strcpy(page, root_fs_names); 261 while (*s++) { 262 if (s[-1] == ',') 263 s[-1] = '\0'; 264 } 265 } else { 266 int len = get_filesystem_list(page); 267 char *p, *next; 268 269 page[len] = '\0'; 270 for (p = page-1; p; p = next) { 271 next = strchr(++p, '\n'); 272 if (*p++ != '\t') 273 continue; 274 while ((*s++ = *p++) != '\n') 275 ; 276 s[-1] = '\0'; 277 } 278 } 279 *s = '\0'; 280 } 281 282 static int __init do_mount_root(char *name, char *fs, int flags, void *data) 283 { 284 int err = sys_mount(name, "/root", fs, flags, data); 285 if (err) 286 return err; 287 288 sys_chdir("/root"); 289 ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev; 290 printk("VFS: Mounted root (%s filesystem)%s.\n", 291 current->fs->pwdmnt->mnt_sb->s_type->name, 292 current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ? 293 " readonly" : ""); 294 return 0; 295 } 296 297 void __init mount_block_root(char *name, int flags) 298 { 299 char *fs_names = __getname(); 300 char *p; 301 #ifdef CONFIG_BLOCK 302 char b[BDEVNAME_SIZE]; 303 #else 304 const char *b = name; 305 #endif 306 307 get_fs_names(fs_names); 308 retry: 309 for (p = fs_names; *p; p += strlen(p)+1) { 310 int err = do_mount_root(name, p, flags, root_mount_data); 311 switch (err) { 312 case 0: 313 goto out; 314 case -EACCES: 315 flags |= MS_RDONLY; 316 goto retry; 317 case -EINVAL: 318 continue; 319 } 320 /* 321 * Allow the user to distinguish between failed sys_open 322 * and bad superblock on root device. 323 * and give them a list of the available devices 324 */ 325 #ifdef CONFIG_BLOCK 326 __bdevname(ROOT_DEV, b); 327 #endif 328 printk("VFS: Cannot open root device \"%s\" or %s\n", 329 root_device_name, b); 330 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); 331 332 printk_all_partitions(); 333 panic("VFS: Unable to mount root fs on %s", b); 334 } 335 336 printk("List of all partitions:\n"); 337 printk_all_partitions(); 338 printk("No filesystem could mount root, tried: "); 339 for (p = fs_names; *p; p += strlen(p)+1) 340 printk(" %s", p); 341 printk("\n"); 342 #ifdef CONFIG_BLOCK 343 __bdevname(ROOT_DEV, b); 344 #endif 345 panic("VFS: Unable to mount root fs on %s", b); 346 out: 347 putname(fs_names); 348 } 349 350 #ifdef CONFIG_ROOT_NFS 351 static int __init mount_nfs_root(void) 352 { 353 void *data = nfs_root_data(); 354 355 create_dev("/dev/root", ROOT_DEV); 356 if (data && 357 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0) 358 return 1; 359 return 0; 360 } 361 #endif 362 363 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) 364 void __init change_floppy(char *fmt, ...) 365 { 366 struct termios termios; 367 char buf[80]; 368 char c; 369 int fd; 370 va_list args; 371 va_start(args, fmt); 372 vsprintf(buf, fmt, args); 373 va_end(args); 374 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); 375 if (fd >= 0) { 376 sys_ioctl(fd, FDEJECT, 0); 377 sys_close(fd); 378 } 379 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); 380 fd = sys_open("/dev/console", O_RDWR, 0); 381 if (fd >= 0) { 382 sys_ioctl(fd, TCGETS, (long)&termios); 383 termios.c_lflag &= ~ICANON; 384 sys_ioctl(fd, TCSETSF, (long)&termios); 385 sys_read(fd, &c, 1); 386 termios.c_lflag |= ICANON; 387 sys_ioctl(fd, TCSETSF, (long)&termios); 388 sys_close(fd); 389 } 390 } 391 #endif 392 393 void __init mount_root(void) 394 { 395 #ifdef CONFIG_ROOT_NFS 396 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) { 397 if (mount_nfs_root()) 398 return; 399 400 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); 401 ROOT_DEV = Root_FD0; 402 } 403 #endif 404 #ifdef CONFIG_BLK_DEV_FD 405 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { 406 /* rd_doload is 2 for a dual initrd/ramload setup */ 407 if (rd_doload==2) { 408 if (rd_load_disk(1)) { 409 ROOT_DEV = Root_RAM1; 410 root_device_name = NULL; 411 } 412 } else 413 change_floppy("root floppy"); 414 } 415 #endif 416 #ifdef CONFIG_BLOCK 417 create_dev("/dev/root", ROOT_DEV); 418 mount_block_root("/dev/root", root_mountflags); 419 #endif 420 } 421 422 /* 423 * Prepare the namespace - decide what/where to mount, load ramdisks, etc. 424 */ 425 void __init prepare_namespace(void) 426 { 427 int is_floppy; 428 429 if (root_delay) { 430 printk(KERN_INFO "Waiting %dsec before mounting root device...\n", 431 root_delay); 432 ssleep(root_delay); 433 } 434 435 /* wait for the known devices to complete their probing */ 436 while (driver_probe_done() != 0) 437 msleep(100); 438 439 md_run_setup(); 440 441 if (saved_root_name[0]) { 442 root_device_name = saved_root_name; 443 if (!strncmp(root_device_name, "mtd", 3)) { 444 mount_block_root(root_device_name, root_mountflags); 445 goto out; 446 } 447 ROOT_DEV = name_to_dev_t(root_device_name); 448 if (strncmp(root_device_name, "/dev/", 5) == 0) 449 root_device_name += 5; 450 } 451 452 if (initrd_load()) 453 goto out; 454 455 /* wait for any asynchronous scanning to complete */ 456 if ((ROOT_DEV == 0) && root_wait) { 457 printk(KERN_INFO "Waiting for root device %s...\n", 458 saved_root_name); 459 while (driver_probe_done() != 0 || 460 (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) 461 msleep(100); 462 } 463 464 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; 465 466 if (is_floppy && rd_doload && rd_load_disk(0)) 467 ROOT_DEV = Root_RAM0; 468 469 mount_root(); 470 out: 471 sys_mount(".", "/", NULL, MS_MOVE, NULL); 472 sys_chroot("."); 473 security_sb_post_mountroot(); 474 } 475 476