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/initrd.h>
17 #include <linux/nfs_fs.h>
18 #include <linux/nfs_fs_sb.h>
19 #include <linux/nfs_mount.h>
21 #include "do_mounts.h"
23 int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
25 int root_mountflags = MS_RDONLY | MS_SILENT;
26 static char * __initdata root_device_name;
27 static char __initdata saved_root_name[64];
28 static int __initdata root_wait;
32 static int __init load_ramdisk(char *str)
34 rd_doload = simple_strtol(str,NULL,0) & 3;
37 __setup("load_ramdisk=", load_ramdisk);
39 static int __init readonly(char *str)
43 root_mountflags |= MS_RDONLY;
47 static int __init readwrite(char *str)
51 root_mountflags &= ~MS_RDONLY;
55 __setup("ro", readonly);
56 __setup("rw", readwrite);
59 * Convert a name into device number. We accept the following variants:
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.
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
75 dev_t name_to_dev_t(char *name)
82 if (strncmp(name, "/dev/", 5) != 0) {
85 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
86 res = MKDEV(maj, min);
87 if (maj != MAJOR(res) || min != MINOR(res))
90 res = new_decode_dev(simple_strtoul(name, &p, 16));
99 if (strcmp(name, "nfs") == 0)
102 if (strcmp(name, "ram") == 0)
105 if (strlen(name) > 31)
111 res = blk_lookup_devt(s, 0);
116 * try non-existant, but valid partition, which may only exist
117 * after revalidating the disk, like partitioned md devices
119 while (p > s && isdigit(p[-1]))
121 if (p == s || !*p || *p == '0')
124 /* try disk name without <part number> */
125 part = simple_strtoul(p, NULL, 10);
127 res = blk_lookup_devt(s, part);
131 /* try disk name without p<part number> */
132 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
135 res = blk_lookup_devt(s, part);
145 static int __init root_dev_setup(char *line)
147 strlcpy(saved_root_name, line, sizeof(saved_root_name));
151 __setup("root=", root_dev_setup);
153 static int __init rootwait_setup(char *str)
161 __setup("rootwait", rootwait_setup);
163 static char * __initdata root_mount_data;
164 static int __init root_data_setup(char *str)
166 root_mount_data = str;
170 static char * __initdata root_fs_names;
171 static int __init fs_names_setup(char *str)
177 static unsigned int __initdata root_delay;
178 static int __init root_delay_setup(char *str)
180 root_delay = simple_strtoul(str, NULL, 0);
184 __setup("rootflags=", root_data_setup);
185 __setup("rootfstype=", fs_names_setup);
186 __setup("rootdelay=", root_delay_setup);
188 static void __init get_fs_names(char *page)
193 strcpy(page, root_fs_names);
199 int len = get_filesystem_list(page);
203 for (p = page-1; p; p = next) {
204 next = strchr(++p, '\n');
207 while ((*s++ = *p++) != '\n')
215 static int __init do_mount_root(char *name, char *fs, int flags, void *data)
217 int err = sys_mount(name, "/root", fs, flags, data);
222 ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
223 printk("VFS: Mounted root (%s filesystem)%s.\n",
224 current->fs->pwd.mnt->mnt_sb->s_type->name,
225 current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
230 void __init mount_block_root(char *name, int flags)
232 char *fs_names = __getname();
235 char b[BDEVNAME_SIZE];
237 const char *b = name;
240 get_fs_names(fs_names);
242 for (p = fs_names; *p; p += strlen(p)+1) {
243 int err = do_mount_root(name, p, flags, root_mount_data);
254 * Allow the user to distinguish between failed sys_open
255 * and bad superblock on root device.
256 * and give them a list of the available devices
259 __bdevname(ROOT_DEV, b);
261 printk("VFS: Cannot open root device \"%s\" or %s\n",
262 root_device_name, b);
263 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
265 printk_all_partitions();
266 #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
267 printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
268 "explicit textual name for \"root=\" boot option.\n");
270 panic("VFS: Unable to mount root fs on %s", b);
273 printk("List of all partitions:\n");
274 printk_all_partitions();
275 printk("No filesystem could mount root, tried: ");
276 for (p = fs_names; *p; p += strlen(p)+1)
280 __bdevname(ROOT_DEV, b);
282 panic("VFS: Unable to mount root fs on %s", b);
287 #ifdef CONFIG_ROOT_NFS
288 static int __init mount_nfs_root(void)
290 void *data = nfs_root_data();
292 create_dev("/dev/root", ROOT_DEV);
294 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
300 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
301 void __init change_floppy(char *fmt, ...)
303 struct termios termios;
309 vsprintf(buf, fmt, args);
311 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
313 sys_ioctl(fd, FDEJECT, 0);
316 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
317 fd = sys_open("/dev/console", O_RDWR, 0);
319 sys_ioctl(fd, TCGETS, (long)&termios);
320 termios.c_lflag &= ~ICANON;
321 sys_ioctl(fd, TCSETSF, (long)&termios);
323 termios.c_lflag |= ICANON;
324 sys_ioctl(fd, TCSETSF, (long)&termios);
330 void __init mount_root(void)
332 #ifdef CONFIG_ROOT_NFS
333 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
334 if (mount_nfs_root())
337 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
341 #ifdef CONFIG_BLK_DEV_FD
342 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
343 /* rd_doload is 2 for a dual initrd/ramload setup */
345 if (rd_load_disk(1)) {
346 ROOT_DEV = Root_RAM1;
347 root_device_name = NULL;
350 change_floppy("root floppy");
354 create_dev("/dev/root", ROOT_DEV);
355 mount_block_root("/dev/root", root_mountflags);
360 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
362 void __init prepare_namespace(void)
367 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
372 /* wait for the known devices to complete their probing */
373 while (driver_probe_done() != 0)
378 if (saved_root_name[0]) {
379 root_device_name = saved_root_name;
380 if (!strncmp(root_device_name, "mtd", 3) ||
381 !strncmp(root_device_name, "ubi", 3)) {
382 mount_block_root(root_device_name, root_mountflags);
385 ROOT_DEV = name_to_dev_t(root_device_name);
386 if (strncmp(root_device_name, "/dev/", 5) == 0)
387 root_device_name += 5;
393 /* wait for any asynchronous scanning to complete */
394 if ((ROOT_DEV == 0) && root_wait) {
395 printk(KERN_INFO "Waiting for root device %s...\n",
397 while (driver_probe_done() != 0 ||
398 (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
402 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
404 if (is_floppy && rd_doload && rd_load_disk(0))
405 ROOT_DEV = Root_RAM0;
409 sys_mount(".", "/", NULL, MS_MOVE, NULL);