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 15 #include <linux/nfs_fs.h> 16 #include <linux/nfs_fs_sb.h> 17 #include <linux/nfs_mount.h> 18 19 #include "do_mounts.h" 20 21 extern int get_filesystem_list(char * buf); 22 23 int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ 24 25 int root_mountflags = MS_RDONLY | MS_SILENT; 26 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 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); 111 if (res) 112 goto done; 113 114 fail: 115 return 0; 116 done: 117 return res; 118 } 119 120 static int __init root_dev_setup(char *line) 121 { 122 strlcpy(saved_root_name, line, sizeof(saved_root_name)); 123 return 1; 124 } 125 126 __setup("root=", root_dev_setup); 127 128 static int __init rootwait_setup(char *str) 129 { 130 if (*str) 131 return 0; 132 root_wait = 1; 133 return 1; 134 } 135 136 __setup("rootwait", rootwait_setup); 137 138 static char * __initdata root_mount_data; 139 static int __init root_data_setup(char *str) 140 { 141 root_mount_data = str; 142 return 1; 143 } 144 145 static char * __initdata root_fs_names; 146 static int __init fs_names_setup(char *str) 147 { 148 root_fs_names = str; 149 return 1; 150 } 151 152 static unsigned int __initdata root_delay; 153 static int __init root_delay_setup(char *str) 154 { 155 root_delay = simple_strtoul(str, NULL, 0); 156 return 1; 157 } 158 159 __setup("rootflags=", root_data_setup); 160 __setup("rootfstype=", fs_names_setup); 161 __setup("rootdelay=", root_delay_setup); 162 163 static void __init get_fs_names(char *page) 164 { 165 char *s = page; 166 167 if (root_fs_names) { 168 strcpy(page, root_fs_names); 169 while (*s++) { 170 if (s[-1] == ',') 171 s[-1] = '\0'; 172 } 173 } else { 174 int len = get_filesystem_list(page); 175 char *p, *next; 176 177 page[len] = '\0'; 178 for (p = page-1; p; p = next) { 179 next = strchr(++p, '\n'); 180 if (*p++ != '\t') 181 continue; 182 while ((*s++ = *p++) != '\n') 183 ; 184 s[-1] = '\0'; 185 } 186 } 187 *s = '\0'; 188 } 189 190 static int __init do_mount_root(char *name, char *fs, int flags, void *data) 191 { 192 int err = sys_mount(name, "/root", fs, flags, data); 193 if (err) 194 return err; 195 196 sys_chdir("/root"); 197 ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev; 198 printk("VFS: Mounted root (%s filesystem)%s.\n", 199 current->fs->pwdmnt->mnt_sb->s_type->name, 200 current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ? 201 " readonly" : ""); 202 return 0; 203 } 204 205 void __init mount_block_root(char *name, int flags) 206 { 207 char *fs_names = __getname(); 208 char *p; 209 #ifdef CONFIG_BLOCK 210 char b[BDEVNAME_SIZE]; 211 #else 212 const char *b = name; 213 #endif 214 215 get_fs_names(fs_names); 216 retry: 217 for (p = fs_names; *p; p += strlen(p)+1) { 218 int err = do_mount_root(name, p, flags, root_mount_data); 219 switch (err) { 220 case 0: 221 goto out; 222 case -EACCES: 223 flags |= MS_RDONLY; 224 goto retry; 225 case -EINVAL: 226 continue; 227 } 228 /* 229 * Allow the user to distinguish between failed sys_open 230 * and bad superblock on root device. 231 * and give them a list of the available devices 232 */ 233 #ifdef CONFIG_BLOCK 234 __bdevname(ROOT_DEV, b); 235 #endif 236 printk("VFS: Cannot open root device \"%s\" or %s\n", 237 root_device_name, b); 238 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); 239 240 printk_all_partitions(); 241 panic("VFS: Unable to mount root fs on %s", b); 242 } 243 244 printk("List of all partitions:\n"); 245 printk_all_partitions(); 246 printk("No filesystem could mount root, tried: "); 247 for (p = fs_names; *p; p += strlen(p)+1) 248 printk(" %s", p); 249 printk("\n"); 250 #ifdef CONFIG_BLOCK 251 __bdevname(ROOT_DEV, b); 252 #endif 253 panic("VFS: Unable to mount root fs on %s", b); 254 out: 255 putname(fs_names); 256 } 257 258 #ifdef CONFIG_ROOT_NFS 259 static int __init mount_nfs_root(void) 260 { 261 void *data = nfs_root_data(); 262 263 create_dev("/dev/root", ROOT_DEV); 264 if (data && 265 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0) 266 return 1; 267 return 0; 268 } 269 #endif 270 271 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) 272 void __init change_floppy(char *fmt, ...) 273 { 274 struct termios termios; 275 char buf[80]; 276 char c; 277 int fd; 278 va_list args; 279 va_start(args, fmt); 280 vsprintf(buf, fmt, args); 281 va_end(args); 282 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); 283 if (fd >= 0) { 284 sys_ioctl(fd, FDEJECT, 0); 285 sys_close(fd); 286 } 287 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); 288 fd = sys_open("/dev/console", O_RDWR, 0); 289 if (fd >= 0) { 290 sys_ioctl(fd, TCGETS, (long)&termios); 291 termios.c_lflag &= ~ICANON; 292 sys_ioctl(fd, TCSETSF, (long)&termios); 293 sys_read(fd, &c, 1); 294 termios.c_lflag |= ICANON; 295 sys_ioctl(fd, TCSETSF, (long)&termios); 296 sys_close(fd); 297 } 298 } 299 #endif 300 301 void __init mount_root(void) 302 { 303 #ifdef CONFIG_ROOT_NFS 304 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) { 305 if (mount_nfs_root()) 306 return; 307 308 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); 309 ROOT_DEV = Root_FD0; 310 } 311 #endif 312 #ifdef CONFIG_BLK_DEV_FD 313 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { 314 /* rd_doload is 2 for a dual initrd/ramload setup */ 315 if (rd_doload==2) { 316 if (rd_load_disk(1)) { 317 ROOT_DEV = Root_RAM1; 318 root_device_name = NULL; 319 } 320 } else 321 change_floppy("root floppy"); 322 } 323 #endif 324 #ifdef CONFIG_BLOCK 325 create_dev("/dev/root", ROOT_DEV); 326 mount_block_root("/dev/root", root_mountflags); 327 #endif 328 } 329 330 /* 331 * Prepare the namespace - decide what/where to mount, load ramdisks, etc. 332 */ 333 void __init prepare_namespace(void) 334 { 335 int is_floppy; 336 337 if (root_delay) { 338 printk(KERN_INFO "Waiting %dsec before mounting root device...\n", 339 root_delay); 340 ssleep(root_delay); 341 } 342 343 /* wait for the known devices to complete their probing */ 344 while (driver_probe_done() != 0) 345 msleep(100); 346 347 md_run_setup(); 348 349 if (saved_root_name[0]) { 350 root_device_name = saved_root_name; 351 if (!strncmp(root_device_name, "mtd", 3)) { 352 mount_block_root(root_device_name, root_mountflags); 353 goto out; 354 } 355 ROOT_DEV = name_to_dev_t(root_device_name); 356 if (strncmp(root_device_name, "/dev/", 5) == 0) 357 root_device_name += 5; 358 } 359 360 if (initrd_load()) 361 goto out; 362 363 /* wait for any asynchronous scanning to complete */ 364 if ((ROOT_DEV == 0) && root_wait) { 365 printk(KERN_INFO "Waiting for root device %s...\n", 366 saved_root_name); 367 while (driver_probe_done() != 0 || 368 (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) 369 msleep(100); 370 } 371 372 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; 373 374 if (is_floppy && rd_doload && rd_load_disk(0)) 375 ROOT_DEV = Root_RAM0; 376 377 mount_root(); 378 out: 379 sys_mount(".", "/", NULL, MS_MOVE, NULL); 380 sys_chroot("."); 381 } 382 383