1 #include <linux/module.h>
2 #include <linux/sched.h>
3 #include <linux/ctype.h>
6 #include <linux/suspend.h>
7 #include <linux/root_dev.h>
8 #include <linux/security.h>
10 #include <linux/nfs_fs.h>
11 #include <linux/nfs_fs_sb.h>
12 #include <linux/nfs_mount.h>
14 #include "do_mounts.h"
16 extern int get_filesystem_list(char * buf);
18 int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
20 int root_mountflags = MS_RDONLY | MS_VERBOSE;
21 char * __initdata root_device_name;
22 static char __initdata saved_root_name[64];
24 /* this is initialized in init/main.c */
27 EXPORT_SYMBOL(ROOT_DEV);
29 static int __init load_ramdisk(char *str)
31 rd_doload = simple_strtol(str,NULL,0) & 3;
34 __setup("load_ramdisk=", load_ramdisk);
36 static int __init readonly(char *str)
40 root_mountflags |= MS_RDONLY;
44 static int __init readwrite(char *str)
48 root_mountflags &= ~MS_RDONLY;
52 __setup("ro", readonly);
53 __setup("rw", readwrite);
55 static dev_t __init try_name(char *name, int part)
64 unsigned int maj, min;
66 /* read device number from .../dev */
68 sprintf(path, "/sys/block/%s/dev", name);
69 fd = sys_open(path, 0, 0);
72 len = sys_read(fd, buf, 32);
74 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
77 if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
79 * Try the %u:%u format -- see print_dev_t()
81 res = MKDEV(maj, min);
82 if (maj != MAJOR(res) || min != MINOR(res))
86 * Nope. Try old-style "0321"
88 res = new_decode_dev(simple_strtoul(buf, &s, 16));
93 /* if it's there and we are not looking for a partition - that's it */
97 /* otherwise read range from .../range */
98 sprintf(path, "/sys/block/%s/range", name);
99 fd = sys_open(path, 0, 0);
102 len = sys_read(fd, buf, 32);
104 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
107 range = simple_strtoul(buf, &s, 10);
111 /* if partition is within range - we got it */
119 * Convert a name into device number. We accept the following variants:
121 * 1) device number in hexadecimal represents itself
122 * 2) /dev/nfs represents Root_NFS (0xff)
123 * 3) /dev/<disk_name> represents the device number of disk
124 * 4) /dev/<disk_name><decimal> represents the device number
125 * of partition - device number of disk plus the partition number
126 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
127 * used when disk name of partitioned disk ends on a digit.
129 * If name doesn't have fall into the categories above, we return 0.
130 * Driverfs is used to check if something is a disk name - it has
131 * all known disks under bus/block/devices. If the disk name
132 * contains slashes, name of driverfs node has them replaced with
133 * bangs. try_name() does the actual checks, assuming that driverfs
134 * is mounted on rootfs /sys.
137 dev_t __init name_to_dev_t(char *name)
145 sys_mkdir("/sys", 0700);
146 if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
150 if (strncmp(name, "/dev/", 5) != 0) {
153 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
154 res = MKDEV(maj, min);
155 if (maj != MAJOR(res) || min != MINOR(res))
158 res = new_decode_dev(simple_strtoul(name, &p, 16));
166 if (strcmp(name, "nfs") == 0)
169 if (strcmp(name, "ram") == 0)
172 if (strlen(name) > 31)
178 res = try_name(s, 0);
182 while (p > s && isdigit(p[-1]))
184 if (p == s || !*p || *p == '0')
186 part = simple_strtoul(p, NULL, 10);
188 res = try_name(s, part);
192 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
195 res = try_name(s, part);
198 sys_umount("/sys", 0);
208 static int __init root_dev_setup(char *line)
210 strlcpy(saved_root_name, line, sizeof(saved_root_name));
214 __setup("root=", root_dev_setup);
216 static char * __initdata root_mount_data;
217 static int __init root_data_setup(char *str)
219 root_mount_data = str;
223 static char * __initdata root_fs_names;
224 static int __init fs_names_setup(char *str)
230 __setup("rootflags=", root_data_setup);
231 __setup("rootfstype=", fs_names_setup);
233 static void __init get_fs_names(char *page)
238 strcpy(page, root_fs_names);
244 int len = get_filesystem_list(page);
248 for (p = page-1; p; p = next) {
249 next = strchr(++p, '\n');
252 while ((*s++ = *p++) != '\n')
260 static int __init do_mount_root(char *name, char *fs, int flags, void *data)
262 int err = sys_mount(name, "/root", fs, flags, data);
267 ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
268 printk("VFS: Mounted root (%s filesystem)%s.\n",
269 current->fs->pwdmnt->mnt_sb->s_type->name,
270 current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
275 void __init mount_block_root(char *name, int flags)
277 char *fs_names = __getname();
279 char b[BDEVNAME_SIZE];
281 get_fs_names(fs_names);
283 for (p = fs_names; *p; p += strlen(p)+1) {
284 int err = do_mount_root(name, p, flags, root_mount_data);
295 * Allow the user to distinguish between failed sys_open
296 * and bad superblock on root device.
298 __bdevname(ROOT_DEV, b);
299 printk("VFS: Cannot open root device \"%s\" or %s\n",
300 root_device_name, b);
301 printk("Please append a correct \"root=\" boot option\n");
303 panic("VFS: Unable to mount root fs on %s", b);
305 panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b));
310 #ifdef CONFIG_ROOT_NFS
311 static int __init mount_nfs_root(void)
313 void *data = nfs_root_data();
315 create_dev("/dev/root", ROOT_DEV, NULL);
317 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
323 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
324 void __init change_floppy(char *fmt, ...)
326 struct termios termios;
332 vsprintf(buf, fmt, args);
334 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
336 sys_ioctl(fd, FDEJECT, 0);
339 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
340 fd = sys_open("/dev/console", O_RDWR, 0);
342 sys_ioctl(fd, TCGETS, (long)&termios);
343 termios.c_lflag &= ~ICANON;
344 sys_ioctl(fd, TCSETSF, (long)&termios);
346 termios.c_lflag |= ICANON;
347 sys_ioctl(fd, TCSETSF, (long)&termios);
353 void __init mount_root(void)
355 #ifdef CONFIG_ROOT_NFS
356 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
357 if (mount_nfs_root())
360 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
364 #ifdef CONFIG_BLK_DEV_FD
365 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
366 /* rd_doload is 2 for a dual initrd/ramload setup */
368 if (rd_load_disk(1)) {
369 ROOT_DEV = Root_RAM1;
370 root_device_name = NULL;
373 change_floppy("root floppy");
376 create_dev("/dev/root", ROOT_DEV, root_device_name);
377 mount_block_root("/dev/root", root_mountflags);
381 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
383 void __init prepare_namespace(void)
391 if (saved_root_name[0]) {
392 root_device_name = saved_root_name;
393 ROOT_DEV = name_to_dev_t(root_device_name);
394 if (strncmp(root_device_name, "/dev/", 5) == 0)
395 root_device_name += 5;
398 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
403 if (is_floppy && rd_doload && rd_load_disk(0))
404 ROOT_DEV = Root_RAM0;
408 umount_devfs("/dev");
409 sys_mount(".", "/", NULL, MS_MOVE, NULL);
411 security_sb_post_mountroot();