blob: 46fe407fb03eb6be6236378be2daa79a61cd5aa1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/module.h>
2#include <linux/sched.h>
3#include <linux/ctype.h>
4#include <linux/fd.h>
5#include <linux/tty.h>
6#include <linux/suspend.h>
7#include <linux/root_dev.h>
8#include <linux/security.h>
9#include <linux/delay.h>
Dave Gilbertdd2a3452007-05-09 02:33:24 -070010#include <linux/genhd.h>
Andrew Mortond53d9f12005-07-12 13:58:07 -070011#include <linux/mount.h>
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -070012#include <linux/device.h>
Adrian Bunk46595392007-05-08 00:24:47 -070013#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15#include <linux/nfs_fs.h>
16#include <linux/nfs_fs_sb.h>
17#include <linux/nfs_mount.h>
18
19#include "do_mounts.h"
20
21extern int get_filesystem_list(char * buf);
22
23int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
24
Theodore Ts'o9b04c992006-03-24 03:15:10 -080025int root_mountflags = MS_RDONLY | MS_SILENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070026char * __initdata root_device_name;
27static char __initdata saved_root_name[64];
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029dev_t ROOT_DEV;
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031static int __init load_ramdisk(char *str)
32{
33 rd_doload = simple_strtol(str,NULL,0) & 3;
34 return 1;
35}
36__setup("load_ramdisk=", load_ramdisk);
37
38static int __init readonly(char *str)
39{
40 if (*str)
41 return 0;
42 root_mountflags |= MS_RDONLY;
43 return 1;
44}
45
46static int __init readwrite(char *str)
47{
48 if (*str)
49 return 0;
50 root_mountflags &= ~MS_RDONLY;
51 return 1;
52}
53
54__setup("ro", readonly);
55__setup("rw", readwrite);
56
57static dev_t try_name(char *name, int part)
58{
59 char path[64];
60 char buf[32];
61 int range;
62 dev_t res;
63 char *s;
64 int len;
65 int fd;
66 unsigned int maj, min;
67
68 /* read device number from .../dev */
69
70 sprintf(path, "/sys/block/%s/dev", name);
71 fd = sys_open(path, 0, 0);
72 if (fd < 0)
73 goto fail;
74 len = sys_read(fd, buf, 32);
75 sys_close(fd);
76 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
77 goto fail;
78 buf[len - 1] = '\0';
79 if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
80 /*
81 * Try the %u:%u format -- see print_dev_t()
82 */
83 res = MKDEV(maj, min);
84 if (maj != MAJOR(res) || min != MINOR(res))
85 goto fail;
86 } else {
87 /*
88 * Nope. Try old-style "0321"
89 */
90 res = new_decode_dev(simple_strtoul(buf, &s, 16));
91 if (*s)
92 goto fail;
93 }
94
95 /* if it's there and we are not looking for a partition - that's it */
96 if (!part)
97 return res;
98
99 /* otherwise read range from .../range */
100 sprintf(path, "/sys/block/%s/range", name);
101 fd = sys_open(path, 0, 0);
102 if (fd < 0)
103 goto fail;
104 len = sys_read(fd, buf, 32);
105 sys_close(fd);
106 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
107 goto fail;
108 buf[len - 1] = '\0';
109 range = simple_strtoul(buf, &s, 10);
110 if (*s)
111 goto fail;
112
113 /* if partition is within range - we got it */
114 if (part < range)
115 return res + part;
116fail:
117 return 0;
118}
119
120/*
121 * Convert a name into device number. We accept the following variants:
122 *
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.
130 *
131 * If name doesn't have fall into the categories above, we return 0.
Rolf Eike Beer13ae6d82005-09-02 09:03:09 +0200132 * Sysfs is used to check if something is a disk name - it has
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 * all known disks under bus/block/devices. If the disk name
Rolf Eike Beer13ae6d82005-09-02 09:03:09 +0200134 * contains slashes, name of sysfs node has them replaced with
135 * bangs. try_name() does the actual checks, assuming that sysfs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 * is mounted on rootfs /sys.
137 */
138
139dev_t name_to_dev_t(char *name)
140{
141 char s[32];
142 char *p;
143 dev_t res = 0;
144 int part;
145
146#ifdef CONFIG_SYSFS
147 int mkdir_err = sys_mkdir("/sys", 0700);
148 if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
149 goto out;
150#endif
151
152 if (strncmp(name, "/dev/", 5) != 0) {
153 unsigned maj, min;
154
155 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
156 res = MKDEV(maj, min);
157 if (maj != MAJOR(res) || min != MINOR(res))
158 goto fail;
159 } else {
160 res = new_decode_dev(simple_strtoul(name, &p, 16));
161 if (*p)
162 goto fail;
163 }
164 goto done;
165 }
166 name += 5;
167 res = Root_NFS;
168 if (strcmp(name, "nfs") == 0)
169 goto done;
170 res = Root_RAM0;
171 if (strcmp(name, "ram") == 0)
172 goto done;
173
174 if (strlen(name) > 31)
175 goto fail;
176 strcpy(s, name);
177 for (p = s; *p; p++)
178 if (*p == '/')
179 *p = '!';
180 res = try_name(s, 0);
181 if (res)
182 goto done;
183
184 while (p > s && isdigit(p[-1]))
185 p--;
186 if (p == s || !*p || *p == '0')
187 goto fail;
188 part = simple_strtoul(p, NULL, 10);
189 *p = '\0';
190 res = try_name(s, part);
191 if (res)
192 goto done;
193
194 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
195 goto fail;
196 p[-1] = '\0';
197 res = try_name(s, part);
198done:
199#ifdef CONFIG_SYSFS
200 sys_umount("/sys", 0);
201out:
202 if (!mkdir_err)
203 sys_rmdir("/sys");
204#endif
205 return res;
206fail:
207 res = 0;
208 goto done;
209}
210
211static int __init root_dev_setup(char *line)
212{
213 strlcpy(saved_root_name, line, sizeof(saved_root_name));
214 return 1;
215}
216
217__setup("root=", root_dev_setup);
218
219static char * __initdata root_mount_data;
220static int __init root_data_setup(char *str)
221{
222 root_mount_data = str;
223 return 1;
224}
225
226static char * __initdata root_fs_names;
227static int __init fs_names_setup(char *str)
228{
229 root_fs_names = str;
230 return 1;
231}
232
233static unsigned int __initdata root_delay;
234static int __init root_delay_setup(char *str)
235{
236 root_delay = simple_strtoul(str, NULL, 0);
237 return 1;
238}
239
240__setup("rootflags=", root_data_setup);
241__setup("rootfstype=", fs_names_setup);
242__setup("rootdelay=", root_delay_setup);
243
244static void __init get_fs_names(char *page)
245{
246 char *s = page;
247
248 if (root_fs_names) {
249 strcpy(page, root_fs_names);
250 while (*s++) {
251 if (s[-1] == ',')
252 s[-1] = '\0';
253 }
254 } else {
255 int len = get_filesystem_list(page);
256 char *p, *next;
257
258 page[len] = '\0';
259 for (p = page-1; p; p = next) {
260 next = strchr(++p, '\n');
261 if (*p++ != '\t')
262 continue;
263 while ((*s++ = *p++) != '\n')
264 ;
265 s[-1] = '\0';
266 }
267 }
268 *s = '\0';
269}
270
271static int __init do_mount_root(char *name, char *fs, int flags, void *data)
272{
273 int err = sys_mount(name, "/root", fs, flags, data);
274 if (err)
275 return err;
276
277 sys_chdir("/root");
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 ?
282 " readonly" : "");
283 return 0;
284}
285
286void __init mount_block_root(char *name, int flags)
287{
288 char *fs_names = __getname();
289 char *p;
David Howells93614012006-09-30 20:45:40 +0200290#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 char b[BDEVNAME_SIZE];
David Howells93614012006-09-30 20:45:40 +0200292#else
293 const char *b = name;
294#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296 get_fs_names(fs_names);
297retry:
298 for (p = fs_names; *p; p += strlen(p)+1) {
299 int err = do_mount_root(name, p, flags, root_mount_data);
300 switch (err) {
301 case 0:
302 goto out;
303 case -EACCES:
304 flags |= MS_RDONLY;
305 goto retry;
306 case -EINVAL:
307 continue;
308 }
309 /*
310 * Allow the user to distinguish between failed sys_open
311 * and bad superblock on root device.
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700312 * and give them a list of the available devices
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 */
David Howells93614012006-09-30 20:45:40 +0200314#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 __bdevname(ROOT_DEV, b);
David Howells93614012006-09-30 20:45:40 +0200316#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 printk("VFS: Cannot open root device \"%s\" or %s\n",
318 root_device_name, b);
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700319 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700321 printk_all_partitions();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 panic("VFS: Unable to mount root fs on %s", b);
323 }
Andy Whitcroftbe6e028b2006-05-15 09:44:29 -0700324
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700325 printk("List of all partitions:\n");
326 printk_all_partitions();
Andy Whitcroftbe6e028b2006-05-15 09:44:29 -0700327 printk("No filesystem could mount root, tried: ");
328 for (p = fs_names; *p; p += strlen(p)+1)
329 printk(" %s", p);
330 printk("\n");
David Howells93614012006-09-30 20:45:40 +0200331#ifdef CONFIG_BLOCK
332 __bdevname(ROOT_DEV, b);
333#endif
334 panic("VFS: Unable to mount root fs on %s", b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335out:
336 putname(fs_names);
337}
338
339#ifdef CONFIG_ROOT_NFS
340static int __init mount_nfs_root(void)
341{
342 void *data = nfs_root_data();
343
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700344 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 if (data &&
346 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
347 return 1;
348 return 0;
349}
350#endif
351
352#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
353void __init change_floppy(char *fmt, ...)
354{
355 struct termios termios;
356 char buf[80];
357 char c;
358 int fd;
359 va_list args;
360 va_start(args, fmt);
361 vsprintf(buf, fmt, args);
362 va_end(args);
363 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
364 if (fd >= 0) {
365 sys_ioctl(fd, FDEJECT, 0);
366 sys_close(fd);
367 }
368 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
369 fd = sys_open("/dev/console", O_RDWR, 0);
370 if (fd >= 0) {
371 sys_ioctl(fd, TCGETS, (long)&termios);
372 termios.c_lflag &= ~ICANON;
373 sys_ioctl(fd, TCSETSF, (long)&termios);
374 sys_read(fd, &c, 1);
375 termios.c_lflag |= ICANON;
376 sys_ioctl(fd, TCSETSF, (long)&termios);
377 sys_close(fd);
378 }
379}
380#endif
381
382void __init mount_root(void)
383{
384#ifdef CONFIG_ROOT_NFS
385 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
386 if (mount_nfs_root())
387 return;
388
389 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
390 ROOT_DEV = Root_FD0;
391 }
392#endif
393#ifdef CONFIG_BLK_DEV_FD
394 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
395 /* rd_doload is 2 for a dual initrd/ramload setup */
396 if (rd_doload==2) {
397 if (rd_load_disk(1)) {
398 ROOT_DEV = Root_RAM1;
399 root_device_name = NULL;
400 }
401 } else
402 change_floppy("root floppy");
403 }
404#endif
David Howells93614012006-09-30 20:45:40 +0200405#ifdef CONFIG_BLOCK
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700406 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 mount_block_root("/dev/root", root_mountflags);
David Howells93614012006-09-30 20:45:40 +0200408#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409}
410
411/*
412 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
413 */
414void __init prepare_namespace(void)
415{
416 int is_floppy;
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 if (root_delay) {
419 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
420 root_delay);
421 ssleep(root_delay);
422 }
423
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700424 /* wait for the known devices to complete their probing */
425 while (driver_probe_done() != 0)
426 msleep(100);
427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 md_run_setup();
429
430 if (saved_root_name[0]) {
431 root_device_name = saved_root_name;
Joern Engele9482b42006-05-30 14:25:46 +0200432 if (!strncmp(root_device_name, "mtd", 3)) {
433 mount_block_root(root_device_name, root_mountflags);
434 goto out;
435 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 ROOT_DEV = name_to_dev_t(root_device_name);
437 if (strncmp(root_device_name, "/dev/", 5) == 0)
438 root_device_name += 5;
439 }
440
441 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
442
443 if (initrd_load())
444 goto out;
445
446 if (is_floppy && rd_doload && rd_load_disk(0))
447 ROOT_DEV = Root_RAM0;
448
449 mount_root();
450out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 sys_mount(".", "/", NULL, MS_MOVE, NULL);
452 sys_chroot(".");
453 security_sb_post_mountroot();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454}
455