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