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