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