1 #include <linux/sched.h>
2 #include <linux/ctype.h>
5 #include <linux/suspend.h>
6 #include <linux/root_dev.h>
7 #include <linux/security.h>
9 #include <linux/nfs_fs.h>
10 #include <linux/nfs_fs_sb.h>
11 #include <linux/nfs_mount.h>
13 #include "do_mounts.h"
15 extern int get_filesystem_list(char * buf);
17 int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
19 int root_mountflags = MS_RDONLY | MS_VERBOSE;
20 char * __initdata root_device_name;
21 static char __initdata saved_root_name[64];
23 /* this is initialized in init/main.c */
26 static int __init load_ramdisk(char *str)
28 rd_doload = simple_strtol(str,NULL,0) & 3;
31 __setup("load_ramdisk=", load_ramdisk);
33 static int __init readonly(char *str)
37 root_mountflags |= MS_RDONLY;
41 static int __init readwrite(char *str)
45 root_mountflags &= ~MS_RDONLY;
49 __setup("ro", readonly);
50 __setup("rw", readwrite);
52 static dev_t __init try_name(char *name, int part)
61 unsigned int maj, min;
63 /* read device number from .../dev */
65 sprintf(path, "/sys/block/%s/dev", name);
66 fd = open(path, 0, 0);
69 len = read(fd, buf, 32);
71 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
75 * The format of dev is now %u:%u -- see print_dev_t()
77 if (sscanf(buf, "%u:%u", &maj, &min) == 2)
78 res = MKDEV(maj, min);
82 /* if it's there and we are not looking for a partition - that's it */
86 /* otherwise read range from .../range */
87 sprintf(path, "/sys/block/%s/range", name);
88 fd = open(path, 0, 0);
91 len = read(fd, buf, 32);
93 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
96 range = simple_strtoul(buf, &s, 10);
100 /* if partition is within range - we got it */
108 * Convert a name into device number. We accept the following variants:
110 * 1) device number in hexadecimal represents itself
111 * 2) /dev/nfs represents Root_NFS (0xff)
112 * 3) /dev/<disk_name> represents the device number of disk
113 * 4) /dev/<disk_name><decimal> represents the device number
114 * of partition - device number of disk plus the partition number
115 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
116 * used when disk name of partitioned disk ends on a digit.
118 * If name doesn't have fall into the categories above, we return 0.
119 * Driverfs is used to check if something is a disk name - it has
120 * all known disks under bus/block/devices. If the disk name
121 * contains slashes, name of driverfs node has them replaced with
122 * dots. try_name() does the actual checks, assuming that driverfs
123 * is mounted on rootfs /sys.
126 dev_t name_to_dev_t(char *name)
133 sys_mkdir("/sys", 0700);
134 if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
137 if (strncmp(name, "/dev/", 5) != 0) {
138 res = (dev_t) simple_strtoul(name, &p, 16);
145 if (strcmp(name, "nfs") == 0)
148 if (strlen(name) > 31)
154 res = try_name(s, 0);
158 while (p > s && isdigit(p[-1]))
160 if (p == s || !*p || *p == '0')
162 part = simple_strtoul(p, NULL, 10);
164 res = try_name(s, part);
168 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
171 res = try_name(s, part);
173 sys_umount("/sys", 0);
182 static int __init root_dev_setup(char *line)
184 strlcpy(saved_root_name, line, sizeof(saved_root_name));
188 __setup("root=", root_dev_setup);
190 static char * __initdata root_mount_data;
191 static int __init root_data_setup(char *str)
193 root_mount_data = str;
197 static char * __initdata root_fs_names;
198 static int __init fs_names_setup(char *str)
204 __setup("rootflags=", root_data_setup);
205 __setup("rootfstype=", fs_names_setup);
207 static void __init get_fs_names(char *page)
212 strcpy(page, root_fs_names);
218 int len = get_filesystem_list(page);
222 for (p = page-1; p; p = next) {
223 next = strchr(++p, '\n');
226 while ((*s++ = *p++) != '\n')
234 static int __init do_mount_root(char *name, char *fs, int flags, void *data)
236 int err = sys_mount(name, "/root", fs, flags, data);
241 ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
242 printk("VFS: Mounted root (%s filesystem)%s.\n",
243 current->fs->pwdmnt->mnt_sb->s_type->name,
244 current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
249 void __init mount_block_root(char *name, int flags)
251 char *fs_names = __getname();
253 char b[BDEVNAME_SIZE];
255 get_fs_names(fs_names);
257 for (p = fs_names; *p; p += strlen(p)+1) {
258 int err = do_mount_root(name, p, flags, root_mount_data);
269 * Allow the user to distinguish between failed open
270 * and bad superblock on root device.
272 __bdevname(ROOT_DEV, b);
273 printk("VFS: Cannot open root device \"%s\" or %s\n",
274 root_device_name, b);
275 printk("Please append a correct \"root=\" boot option\n");
276 panic("VFS: Unable to mount root fs on %s", b);
278 panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b));
283 #ifdef CONFIG_ROOT_NFS
284 static int __init mount_nfs_root(void)
286 void *data = nfs_root_data();
288 create_dev("/dev/root", ROOT_DEV, NULL);
290 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
296 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
297 void __init change_floppy(char *fmt, ...)
299 struct termios termios;
305 vsprintf(buf, fmt, args);
307 fd = open("/dev/root", O_RDWR | O_NDELAY, 0);
309 sys_ioctl(fd, FDEJECT, 0);
312 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
313 fd = open("/dev/console", O_RDWR, 0);
315 sys_ioctl(fd, TCGETS, (long)&termios);
316 termios.c_lflag &= ~ICANON;
317 sys_ioctl(fd, TCSETSF, (long)&termios);
319 termios.c_lflag |= ICANON;
320 sys_ioctl(fd, TCSETSF, (long)&termios);
326 void __init mount_root(void)
328 #ifdef CONFIG_ROOT_NFS
329 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
330 if (mount_nfs_root())
333 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
337 #ifdef CONFIG_BLK_DEV_FD
338 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
339 /* rd_doload is 2 for a dual initrd/ramload setup */
341 if (rd_load_disk(1)) {
342 ROOT_DEV = Root_RAM1;
343 root_device_name = NULL;
346 change_floppy("root floppy");
349 create_dev("/dev/root", ROOT_DEV, root_device_name);
350 mount_block_root("/dev/root", root_mountflags);
354 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
356 void __init prepare_namespace(void)
364 if (saved_root_name[0]) {
365 root_device_name = saved_root_name;
366 ROOT_DEV = name_to_dev_t(root_device_name);
367 if (strncmp(root_device_name, "/dev/", 5) == 0)
368 root_device_name += 5;
371 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
373 /* This has to be before mounting root, because even readonly mount of reiserfs would replay
374 log corrupting stuff */
380 if (is_floppy && rd_doload && rd_load_disk(0))
381 ROOT_DEV = Root_RAM0;
385 umount_devfs("/dev");
386 sys_mount(".", "/", NULL, MS_MOVE, NULL);
388 security_sb_post_mountroot();