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();