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