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