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)
62 /* read device number from .../dev */
64 sprintf(path, "/sys/block/%s/dev", name);
65 fd = open(path, 0, 0);
68 len = read(fd, buf, 32);
70 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
73 res = (dev_t) simple_strtoul(buf, &s, 16);
77 /* if it's there and we are not looking for a partition - that's it */
81 /* otherwise read range from .../range */
82 sprintf(path, "/sys/block/%s/range", name);
83 fd = open(path, 0, 0);
86 len = read(fd, buf, 32);
88 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
91 range = simple_strtoul(buf, &s, 10);
95 /* if partition is within range - we got it */
103 * Convert a name into device number. We accept the following variants:
105 * 1) device number in hexadecimal represents itself
106 * 2) /dev/nfs represents Root_NFS (0xff)
107 * 3) /dev/<disk_name> represents the device number of disk
108 * 4) /dev/<disk_name><decimal> represents the device number
109 * of partition - device number of disk plus the partition number
110 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
111 * used when disk name of partitioned disk ends on a digit.
113 * If name doesn't have fall into the categories above, we return 0.
114 * Driverfs is used to check if something is a disk name - it has
115 * all known disks under bus/block/devices. If the disk name
116 * contains slashes, name of driverfs node has them replaced with
117 * dots. try_name() does the actual checks, assuming that driverfs
118 * is mounted on rootfs /sys.
121 dev_t name_to_dev_t(char *name)
128 sys_mkdir("/sys", 0700);
129 if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
132 if (strncmp(name, "/dev/", 5) != 0) {
133 res = (dev_t) simple_strtoul(name, &p, 16);
140 if (strcmp(name, "nfs") == 0)
143 if (strlen(name) > 31)
149 res = try_name(s, 0);
153 while (p > s && isdigit(p[-1]))
155 if (p == s || !*p || *p == '0')
157 part = simple_strtoul(p, NULL, 10);
159 res = try_name(s, part);
163 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
166 res = try_name(s, part);
168 sys_umount("/sys", 0);
177 static int __init root_dev_setup(char *line)
179 strlcpy(saved_root_name, line, sizeof(saved_root_name));
183 __setup("root=", root_dev_setup);
185 static char * __initdata root_mount_data;
186 static int __init root_data_setup(char *str)
188 root_mount_data = str;
192 static char * __initdata root_fs_names;
193 static int __init fs_names_setup(char *str)
199 __setup("rootflags=", root_data_setup);
200 __setup("rootfstype=", fs_names_setup);
202 static void __init get_fs_names(char *page)
207 strcpy(page, root_fs_names);
213 int len = get_filesystem_list(page);
217 for (p = page-1; p; p = next) {
218 next = strchr(++p, '\n');
221 while ((*s++ = *p++) != '\n')
229 static int __init do_mount_root(char *name, char *fs, int flags, void *data)
231 int err = sys_mount(name, "/root", fs, flags, data);
236 ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
237 printk("VFS: Mounted root (%s filesystem)%s.\n",
238 current->fs->pwdmnt->mnt_sb->s_type->name,
239 current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
244 void __init mount_block_root(char *name, int flags)
246 char *fs_names = __getname();
248 char b[BDEVNAME_SIZE];
250 get_fs_names(fs_names);
252 for (p = fs_names; *p; p += strlen(p)+1) {
253 int err = do_mount_root(name, p, flags, root_mount_data);
264 * Allow the user to distinguish between failed open
265 * and bad superblock on root device.
267 __bdevname(ROOT_DEV, b);
268 printk("VFS: Cannot open root device \"%s\" or %s\n",
269 root_device_name, b);
270 printk("Please append a correct \"root=\" boot option\n");
271 panic("VFS: Unable to mount root fs on %s", b);
273 panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b));
278 #ifdef CONFIG_ROOT_NFS
279 static int __init mount_nfs_root(void)
281 void *data = nfs_root_data();
283 create_dev("/dev/root", ROOT_DEV, NULL);
285 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
291 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
292 void __init change_floppy(char *fmt, ...)
294 struct termios termios;
300 vsprintf(buf, fmt, args);
302 fd = open("/dev/root", O_RDWR | O_NDELAY, 0);
304 sys_ioctl(fd, FDEJECT, 0);
307 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
308 fd = open("/dev/console", O_RDWR, 0);
310 sys_ioctl(fd, TCGETS, (long)&termios);
311 termios.c_lflag &= ~ICANON;
312 sys_ioctl(fd, TCSETSF, (long)&termios);
314 termios.c_lflag |= ICANON;
315 sys_ioctl(fd, TCSETSF, (long)&termios);
321 void __init mount_root(void)
323 #ifdef CONFIG_ROOT_NFS
324 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
325 if (mount_nfs_root())
328 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
332 #ifdef CONFIG_BLK_DEV_FD
333 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
334 /* rd_doload is 2 for a dual initrd/ramload setup */
336 if (rd_load_disk(1)) {
337 ROOT_DEV = Root_RAM1;
338 root_device_name = NULL;
341 change_floppy("root floppy");
344 create_dev("/dev/root", ROOT_DEV, root_device_name);
345 mount_block_root("/dev/root", root_mountflags);
349 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
351 void __init prepare_namespace(void)
359 if (saved_root_name[0]) {
360 root_device_name = saved_root_name;
361 ROOT_DEV = name_to_dev_t(root_device_name);
362 if (strncmp(root_device_name, "/dev/", 5) == 0)
363 root_device_name += 5;
366 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
368 /* This has to be before mounting root, because even readonly mount of reiserfs would replay
369 log corrupting stuff */
375 if (is_floppy && rd_doload && rd_load_disk(0))
376 ROOT_DEV = Root_RAM0;
380 umount_devfs("/dev");
381 sys_mount(".", "/", NULL, MS_MOVE, NULL);
383 security_sb_post_mountroot();