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/mount.h> 11 12 #include <linux/nfs_fs.h> 13 #include <linux/nfs_fs_sb.h> 14 #include <linux/nfs_mount.h> 15 16 #include "do_mounts.h" 17 18 extern int get_filesystem_list(char * buf); 19 20 int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ 21 22 int root_mountflags = MS_RDONLY | MS_VERBOSE; 23 char * __initdata root_device_name; 24 static char __initdata saved_root_name[64]; 25 26 /* this is initialized in init/main.c */ 27 dev_t ROOT_DEV; 28 29 EXPORT_SYMBOL(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 * Driverfs 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 driverfs node has them replaced with 135 * bangs. try_name() does the actual checks, assuming that driverfs 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 char b[BDEVNAME_SIZE]; 291 292 get_fs_names(fs_names); 293 retry: 294 for (p = fs_names; *p; p += strlen(p)+1) { 295 int err = do_mount_root(name, p, flags, root_mount_data); 296 switch (err) { 297 case 0: 298 goto out; 299 case -EACCES: 300 flags |= MS_RDONLY; 301 goto retry; 302 case -EINVAL: 303 continue; 304 } 305 /* 306 * Allow the user to distinguish between failed sys_open 307 * and bad superblock on root device. 308 */ 309 __bdevname(ROOT_DEV, b); 310 printk("VFS: Cannot open root device \"%s\" or %s\n", 311 root_device_name, b); 312 printk("Please append a correct \"root=\" boot option\n"); 313 314 panic("VFS: Unable to mount root fs on %s", b); 315 } 316 panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b)); 317 out: 318 putname(fs_names); 319 } 320 321 #ifdef CONFIG_ROOT_NFS 322 static int __init mount_nfs_root(void) 323 { 324 void *data = nfs_root_data(); 325 326 create_dev("/dev/root", ROOT_DEV, NULL); 327 if (data && 328 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0) 329 return 1; 330 return 0; 331 } 332 #endif 333 334 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) 335 void __init change_floppy(char *fmt, ...) 336 { 337 struct termios termios; 338 char buf[80]; 339 char c; 340 int fd; 341 va_list args; 342 va_start(args, fmt); 343 vsprintf(buf, fmt, args); 344 va_end(args); 345 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); 346 if (fd >= 0) { 347 sys_ioctl(fd, FDEJECT, 0); 348 sys_close(fd); 349 } 350 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); 351 fd = sys_open("/dev/console", O_RDWR, 0); 352 if (fd >= 0) { 353 sys_ioctl(fd, TCGETS, (long)&termios); 354 termios.c_lflag &= ~ICANON; 355 sys_ioctl(fd, TCSETSF, (long)&termios); 356 sys_read(fd, &c, 1); 357 termios.c_lflag |= ICANON; 358 sys_ioctl(fd, TCSETSF, (long)&termios); 359 sys_close(fd); 360 } 361 } 362 #endif 363 364 void __init mount_root(void) 365 { 366 #ifdef CONFIG_ROOT_NFS 367 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) { 368 if (mount_nfs_root()) 369 return; 370 371 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); 372 ROOT_DEV = Root_FD0; 373 } 374 #endif 375 #ifdef CONFIG_BLK_DEV_FD 376 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { 377 /* rd_doload is 2 for a dual initrd/ramload setup */ 378 if (rd_doload==2) { 379 if (rd_load_disk(1)) { 380 ROOT_DEV = Root_RAM1; 381 root_device_name = NULL; 382 } 383 } else 384 change_floppy("root floppy"); 385 } 386 #endif 387 create_dev("/dev/root", ROOT_DEV, root_device_name); 388 mount_block_root("/dev/root", root_mountflags); 389 } 390 391 /* 392 * Prepare the namespace - decide what/where to mount, load ramdisks, etc. 393 */ 394 void __init prepare_namespace(void) 395 { 396 int is_floppy; 397 398 mount_devfs(); 399 400 if (root_delay) { 401 printk(KERN_INFO "Waiting %dsec before mounting root device...\n", 402 root_delay); 403 ssleep(root_delay); 404 } 405 406 md_run_setup(); 407 408 if (saved_root_name[0]) { 409 root_device_name = saved_root_name; 410 ROOT_DEV = name_to_dev_t(root_device_name); 411 if (strncmp(root_device_name, "/dev/", 5) == 0) 412 root_device_name += 5; 413 } 414 415 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; 416 417 if (initrd_load()) 418 goto out; 419 420 if (is_floppy && rd_doload && rd_load_disk(0)) 421 ROOT_DEV = Root_RAM0; 422 423 mount_root(); 424 out: 425 umount_devfs("/dev"); 426 sys_mount(".", "/", NULL, MS_MOVE, NULL); 427 sys_chroot("."); 428 security_sb_post_mountroot(); 429 mount_devfs_fs (); 430 } 431 432