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>
12 #include <linux/nfs_fs.h>
13 #include <linux/nfs_fs_sb.h>
14 #include <linux/nfs_mount.h>
16 #include "do_mounts.h"
18 extern int get_filesystem_list(char * buf
);
20 int __initdata rd_doload
; /* 1 = load RAM disk, 0 = don't load */
22 int root_mountflags
= MS_RDONLY
| MS_VERBOSE
;
23 char * __initdata root_device_name
;
24 static char __initdata saved_root_name
[64];
26 /* this is initialized in init/main.c */
29 EXPORT_SYMBOL(ROOT_DEV
);
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 * Driverfs 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 driverfs node has them replaced with
135 * bangs. try_name() does the actual checks, assuming that driverfs
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();
290 char b
[BDEVNAME_SIZE
];
292 get_fs_names(fs_names
);
294 for (p
= fs_names
; *p
; p
+= strlen(p
)+1) {
295 int err
= do_mount_root(name
, p
, flags
, root_mount_data
);
306 * Allow the user to distinguish between failed sys_open
307 * and bad superblock on root device.
309 __bdevname(ROOT_DEV
, b
);
310 printk("VFS: Cannot open root device \"%s\" or %s\n",
311 root_device_name
, b
);
312 printk("Please append a correct \"root=\" boot option\n");
314 panic("VFS: Unable to mount root fs on %s", b
);
316 panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV
, b
));
321 #ifdef CONFIG_ROOT_NFS
322 static int __init
mount_nfs_root(void)
324 void *data
= nfs_root_data();
326 create_dev("/dev/root", ROOT_DEV
, NULL
);
328 do_mount_root("/dev/root", "nfs", root_mountflags
, data
) == 0)
334 #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
335 void __init
change_floppy(char *fmt
, ...)
337 struct termios termios
;
343 vsprintf(buf
, fmt
, args
);
345 fd
= sys_open("/dev/root", O_RDWR
| O_NDELAY
, 0);
347 sys_ioctl(fd
, FDEJECT
, 0);
350 printk(KERN_NOTICE
"VFS: Insert %s and press ENTER\n", buf
);
351 fd
= sys_open("/dev/console", O_RDWR
, 0);
353 sys_ioctl(fd
, TCGETS
, (long)&termios
);
354 termios
.c_lflag
&= ~ICANON
;
355 sys_ioctl(fd
, TCSETSF
, (long)&termios
);
357 termios
.c_lflag
|= ICANON
;
358 sys_ioctl(fd
, TCSETSF
, (long)&termios
);
364 void __init
mount_root(void)
366 #ifdef CONFIG_ROOT_NFS
367 if (MAJOR(ROOT_DEV
) == UNNAMED_MAJOR
) {
368 if (mount_nfs_root())
371 printk(KERN_ERR
"VFS: Unable to mount root fs via NFS, trying floppy.\n");
375 #ifdef CONFIG_BLK_DEV_FD
376 if (MAJOR(ROOT_DEV
) == FLOPPY_MAJOR
) {
377 /* rd_doload is 2 for a dual initrd/ramload setup */
379 if (rd_load_disk(1)) {
380 ROOT_DEV
= Root_RAM1
;
381 root_device_name
= NULL
;
384 change_floppy("root floppy");
387 create_dev("/dev/root", ROOT_DEV
, root_device_name
);
388 mount_block_root("/dev/root", root_mountflags
);
392 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
394 void __init
prepare_namespace(void)
401 printk(KERN_INFO
"Waiting %dsec before mounting root device...\n",
408 if (saved_root_name
[0]) {
409 root_device_name
= saved_root_name
;
410 ROOT_DEV
= name_to_dev_t(root_device_name
);
411 if (strncmp(root_device_name
, "/dev/", 5) == 0)
412 root_device_name
+= 5;
415 is_floppy
= MAJOR(ROOT_DEV
) == FLOPPY_MAJOR
;
420 if (is_floppy
&& rd_doload
&& rd_load_disk(0))
421 ROOT_DEV
= Root_RAM0
;
425 umount_devfs("/dev");
426 sys_mount(".", "/", NULL
, MS_MOVE
, NULL
);
428 security_sb_post_mountroot();