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>
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>
15 #include <linux/nfs_fs.h>
16 #include <linux/nfs_fs_sb.h>
17 #include <linux/nfs_mount.h>
19 #include "do_mounts.h"
21 extern int get_filesystem_list(char * buf);
23 int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
25 int root_mountflags = MS_RDONLY | MS_SILENT;
26 char * __initdata root_device_name;
27 static char __initdata saved_root_name[64];
31 static int __init load_ramdisk(char *str)
33 rd_doload = simple_strtol(str,NULL,0) & 3;
36 __setup("load_ramdisk=", load_ramdisk);
38 static int __init readonly(char *str)
42 root_mountflags |= MS_RDONLY;
46 static int __init readwrite(char *str)
50 root_mountflags &= ~MS_RDONLY;
54 __setup("ro", readonly);
55 __setup("rw", readwrite);
57 static dev_t try_name(char *name, int part)
66 unsigned int maj, min;
68 /* read device number from .../dev */
70 sprintf(path, "/sys/block/%s/dev", name);
71 fd = sys_open(path, 0, 0);
74 len = sys_read(fd, buf, 32);
76 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
79 if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
81 * Try the %u:%u format -- see print_dev_t()
83 res = MKDEV(maj, min);
84 if (maj != MAJOR(res) || min != MINOR(res))
88 * Nope. Try old-style "0321"
90 res = new_decode_dev(simple_strtoul(buf, &s, 16));
95 /* if it's there and we are not looking for a partition - that's it */
99 /* otherwise read range from .../range */
100 sprintf(path, "/sys/block/%s/range", name);
101 fd = sys_open(path, 0, 0);
104 len = sys_read(fd, buf, 32);
106 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
109 range = simple_strtoul(buf, &s, 10);
113 /* if partition is within range - we got it */
121 * Convert a name into device number. We accept the following variants:
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.
131 * If name doesn't have fall into the categories above, we return 0.
132 * Sysfs 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 sysfs node has them replaced with
135 * bangs. try_name() does the actual checks, assuming that sysfs
136 * is mounted on rootfs /sys.
139 dev_t name_to_dev_t(char *name)
147 int mkdir_err = sys_mkdir("/sys", 0700);
148 if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
152 if (strncmp(name, "/dev/", 5) != 0) {
155 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
156 res = MKDEV(maj, min);
157 if (maj != MAJOR(res) || min != MINOR(res))
160 res = new_decode_dev(simple_strtoul(name, &p, 16));
168 if (strcmp(name, "nfs") == 0)
171 if (strcmp(name, "ram") == 0)
174 if (strlen(name) > 31)
180 res = try_name(s, 0);
184 while (p > s && isdigit(p[-1]))
186 if (p == s || !*p || *p == '0')
188 part = simple_strtoul(p, NULL, 10);
190 res = try_name(s, part);
194 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
197 res = try_name(s, part);
200 sys_umount("/sys", 0);
211 static int __init root_dev_setup(char *line)
213 strlcpy(saved_root_name, line, sizeof(saved_root_name));
217 __setup("root=", root_dev_setup);
219 static char * __initdata root_mount_data;
220 static int __init root_data_setup(char *str)
222 root_mount_data = str;
226 static char * __initdata root_fs_names;
227 static int __init fs_names_setup(char *str)
233 static unsigned int __initdata root_delay;
234 static int __init root_delay_setup(char *str)
236 root_delay = simple_strtoul(str, NULL, 0);
240 __setup("rootflags=", root_data_setup);
241 __setup("rootfstype=", fs_names_setup);
242 __setup("rootdelay=", root_delay_setup);
244 static void __init get_fs_names(char *page)
249 strcpy(page, root_fs_names);
255 int len = get_filesystem_list(page);
259 for (p = page-1; p; p = next) {
260 next = strchr(++p, '\n');
263 while ((*s++ = *p++) != '\n')
271 static int __init do_mount_root(char *name, char *fs, int flags, void *data)
273 int err = sys_mount(name, "/root", fs, flags, data);
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 ?
286 void __init mount_block_root(char *name, int flags)
288 char *fs_names = __getname();
291 char b[BDEVNAME_SIZE];
293 const char *b = name;
296 get_fs_names(fs_names);
298 for (p = fs_names; *p; p += strlen(p)+1) {
299 int err = do_mount_root(name, p, flags, root_mount_data);
310 * Allow the user to distinguish between failed sys_open
311 * and bad superblock on root device.
312 * and give them a list of the available devices
315 __bdevname(ROOT_DEV, b);
317 printk("VFS: Cannot open root device \"%s\" or %s\n",
318 root_device_name, b);
319 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
321 printk_all_partitions();
322 panic("VFS: Unable to mount root fs on %s", b);
325 printk("List of all partitions:\n");
326 printk_all_partitions();
327 printk("No filesystem could mount root, tried: ");
328 for (p = fs_names; *p; p += strlen(p)+1)
332 __bdevname(ROOT_DEV, b);
334 panic("VFS: Unable to mount root fs on %s", b);
339 #ifdef CONFIG_ROOT_NFS
340 static int __init mount_nfs_root(void)
342 void *data = nfs_root_data();
344 create_dev("/dev/root", ROOT_DEV);
346 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
352 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
353 void __init change_floppy(char *fmt, ...)
355 struct termios termios;
361 vsprintf(buf, fmt, args);
363 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
365 sys_ioctl(fd, FDEJECT, 0);
368 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
369 fd = sys_open("/dev/console", O_RDWR, 0);
371 sys_ioctl(fd, TCGETS, (long)&termios);
372 termios.c_lflag &= ~ICANON;
373 sys_ioctl(fd, TCSETSF, (long)&termios);
375 termios.c_lflag |= ICANON;
376 sys_ioctl(fd, TCSETSF, (long)&termios);
382 void __init mount_root(void)
384 #ifdef CONFIG_ROOT_NFS
385 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
386 if (mount_nfs_root())
389 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
393 #ifdef CONFIG_BLK_DEV_FD
394 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
395 /* rd_doload is 2 for a dual initrd/ramload setup */
397 if (rd_load_disk(1)) {
398 ROOT_DEV = Root_RAM1;
399 root_device_name = NULL;
402 change_floppy("root floppy");
406 create_dev("/dev/root", ROOT_DEV);
407 mount_block_root("/dev/root", root_mountflags);
412 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
414 void __init prepare_namespace(void)
419 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
424 /* wait for the known devices to complete their probing */
425 while (driver_probe_done() != 0)
430 if (saved_root_name[0]) {
431 root_device_name = saved_root_name;
432 if (!strncmp(root_device_name, "mtd", 3)) {
433 mount_block_root(root_device_name, root_mountflags);
436 ROOT_DEV = name_to_dev_t(root_device_name);
437 if (strncmp(root_device_name, "/dev/", 5) == 0)
438 root_device_name += 5;
441 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
446 if (is_floppy && rd_doload && rd_load_disk(0))
447 ROOT_DEV = Root_RAM0;
451 sys_mount(".", "/", NULL, MS_MOVE, NULL);
453 security_sb_post_mountroot();