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/mount.h>
11 #include <linux/device.h>
12 #include <linux/init.h>
14 #include <linux/nfs_fs.h>
15 #include <linux/nfs_fs_sb.h>
16 #include <linux/nfs_mount.h>
18 #include "do_mounts.h"
20 extern int get_filesystem_list(char * buf);
22 int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
24 int root_mountflags = MS_RDONLY | MS_SILENT;
25 char * __initdata root_device_name;
26 static char __initdata saved_root_name[64];
30 static int __init load_ramdisk(char *str)
32 rd_doload = simple_strtol(str,NULL,0) & 3;
35 __setup("load_ramdisk=", load_ramdisk);
37 static int __init readonly(char *str)
41 root_mountflags |= MS_RDONLY;
45 static int __init readwrite(char *str)
49 root_mountflags &= ~MS_RDONLY;
53 __setup("ro", readonly);
54 __setup("rw", readwrite);
56 static dev_t try_name(char *name, int part)
65 unsigned int maj, min;
67 /* read device number from .../dev */
69 sprintf(path, "/sys/block/%s/dev", name);
70 fd = sys_open(path, 0, 0);
73 len = sys_read(fd, buf, 32);
75 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
78 if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
80 * Try the %u:%u format -- see print_dev_t()
82 res = MKDEV(maj, min);
83 if (maj != MAJOR(res) || min != MINOR(res))
87 * Nope. Try old-style "0321"
89 res = new_decode_dev(simple_strtoul(buf, &s, 16));
94 /* if it's there and we are not looking for a partition - that's it */
98 /* otherwise read range from .../range */
99 sprintf(path, "/sys/block/%s/range", name);
100 fd = sys_open(path, 0, 0);
103 len = sys_read(fd, buf, 32);
105 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
108 range = simple_strtoul(buf, &s, 10);
112 /* if partition is within range - we got it */
120 * Convert a name into device number. We accept the following variants:
122 * 1) device number in hexadecimal represents itself
123 * 2) /dev/nfs represents Root_NFS (0xff)
124 * 3) /dev/<disk_name> represents the device number of disk
125 * 4) /dev/<disk_name><decimal> represents the device number
126 * of partition - device number of disk plus the partition number
127 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
128 * used when disk name of partitioned disk ends on a digit.
130 * If name doesn't have fall into the categories above, we return 0.
131 * Sysfs is used to check if something is a disk name - it has
132 * all known disks under bus/block/devices. If the disk name
133 * contains slashes, name of sysfs node has them replaced with
134 * bangs. try_name() does the actual checks, assuming that sysfs
135 * is mounted on rootfs /sys.
138 dev_t name_to_dev_t(char *name)
146 int mkdir_err = sys_mkdir("/sys", 0700);
147 if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
151 if (strncmp(name, "/dev/", 5) != 0) {
154 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
155 res = MKDEV(maj, min);
156 if (maj != MAJOR(res) || min != MINOR(res))
159 res = new_decode_dev(simple_strtoul(name, &p, 16));
167 if (strcmp(name, "nfs") == 0)
170 if (strcmp(name, "ram") == 0)
173 if (strlen(name) > 31)
179 res = try_name(s, 0);
183 while (p > s && isdigit(p[-1]))
185 if (p == s || !*p || *p == '0')
187 part = simple_strtoul(p, NULL, 10);
189 res = try_name(s, part);
193 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
196 res = try_name(s, part);
199 sys_umount("/sys", 0);
210 static int __init root_dev_setup(char *line)
212 strlcpy(saved_root_name, line, sizeof(saved_root_name));
216 __setup("root=", root_dev_setup);
218 static char * __initdata root_mount_data;
219 static int __init root_data_setup(char *str)
221 root_mount_data = str;
225 static char * __initdata root_fs_names;
226 static int __init fs_names_setup(char *str)
232 static unsigned int __initdata root_delay;
233 static int __init root_delay_setup(char *str)
235 root_delay = simple_strtoul(str, NULL, 0);
239 __setup("rootflags=", root_data_setup);
240 __setup("rootfstype=", fs_names_setup);
241 __setup("rootdelay=", root_delay_setup);
243 static void __init get_fs_names(char *page)
248 strcpy(page, root_fs_names);
254 int len = get_filesystem_list(page);
258 for (p = page-1; p; p = next) {
259 next = strchr(++p, '\n');
262 while ((*s++ = *p++) != '\n')
270 static int __init do_mount_root(char *name, char *fs, int flags, void *data)
272 int err = sys_mount(name, "/root", fs, flags, data);
277 ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
278 printk("VFS: Mounted root (%s filesystem)%s.\n",
279 current->fs->pwdmnt->mnt_sb->s_type->name,
280 current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
285 void __init mount_block_root(char *name, int flags)
287 char *fs_names = __getname();
290 char b[BDEVNAME_SIZE];
292 const char *b = name;
295 get_fs_names(fs_names);
297 for (p = fs_names; *p; p += strlen(p)+1) {
298 int err = do_mount_root(name, p, flags, root_mount_data);
309 * Allow the user to distinguish between failed sys_open
310 * and bad superblock on root device.
313 __bdevname(ROOT_DEV, b);
315 printk("VFS: Cannot open root device \"%s\" or %s\n",
316 root_device_name, b);
317 printk("Please append a correct \"root=\" boot option\n");
319 panic("VFS: Unable to mount root fs on %s", b);
322 printk("No filesystem could mount root, tried: ");
323 for (p = fs_names; *p; p += strlen(p)+1)
327 __bdevname(ROOT_DEV, b);
329 panic("VFS: Unable to mount root fs on %s", b);
334 #ifdef CONFIG_ROOT_NFS
335 static int __init mount_nfs_root(void)
337 void *data = nfs_root_data();
339 create_dev("/dev/root", ROOT_DEV);
341 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
347 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
348 void __init change_floppy(char *fmt, ...)
350 struct termios termios;
356 vsprintf(buf, fmt, args);
358 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
360 sys_ioctl(fd, FDEJECT, 0);
363 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
364 fd = sys_open("/dev/console", O_RDWR, 0);
366 sys_ioctl(fd, TCGETS, (long)&termios);
367 termios.c_lflag &= ~ICANON;
368 sys_ioctl(fd, TCSETSF, (long)&termios);
370 termios.c_lflag |= ICANON;
371 sys_ioctl(fd, TCSETSF, (long)&termios);
377 void __init mount_root(void)
379 #ifdef CONFIG_ROOT_NFS
380 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
381 if (mount_nfs_root())
384 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
388 #ifdef CONFIG_BLK_DEV_FD
389 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
390 /* rd_doload is 2 for a dual initrd/ramload setup */
392 if (rd_load_disk(1)) {
393 ROOT_DEV = Root_RAM1;
394 root_device_name = NULL;
397 change_floppy("root floppy");
401 create_dev("/dev/root", ROOT_DEV);
402 mount_block_root("/dev/root", root_mountflags);
407 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
409 void __init prepare_namespace(void)
414 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
419 /* wait for the known devices to complete their probing */
420 while (driver_probe_done() != 0)
425 if (saved_root_name[0]) {
426 root_device_name = saved_root_name;
427 if (!strncmp(root_device_name, "mtd", 3)) {
428 mount_block_root(root_device_name, root_mountflags);
431 ROOT_DEV = name_to_dev_t(root_device_name);
432 if (strncmp(root_device_name, "/dev/", 5) == 0)
433 root_device_name += 5;
436 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
441 if (is_floppy && rd_doload && rd_load_disk(0))
442 ROOT_DEV = Root_RAM0;
446 sys_mount(".", "/", NULL, MS_MOVE, NULL);
448 security_sb_post_mountroot();