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