blob: dc1ec0803ef9b93b76c27b9db3a9d3e741f98280 [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>
Andrew Mortond53d9f12005-07-12 13:58:07 -070010#include <linux/mount.h>
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -070011#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
13#include <linux/nfs_fs.h>
14#include <linux/nfs_fs_sb.h>
15#include <linux/nfs_mount.h>
16
17#include "do_mounts.h"
18
19extern int get_filesystem_list(char * buf);
20
21int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
22
Theodore Ts'o9b04c992006-03-24 03:15:10 -080023int root_mountflags = MS_RDONLY | MS_SILENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070024char * __initdata root_device_name;
25static char __initdata saved_root_name[64];
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027dev_t ROOT_DEV;
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029static int __init load_ramdisk(char *str)
30{
31 rd_doload = simple_strtol(str,NULL,0) & 3;
32 return 1;
33}
34__setup("load_ramdisk=", load_ramdisk);
35
36static int __init readonly(char *str)
37{
38 if (*str)
39 return 0;
40 root_mountflags |= MS_RDONLY;
41 return 1;
42}
43
44static int __init readwrite(char *str)
45{
46 if (*str)
47 return 0;
48 root_mountflags &= ~MS_RDONLY;
49 return 1;
50}
51
52__setup("ro", readonly);
53__setup("rw", readwrite);
54
55static dev_t try_name(char *name, int part)
56{
57 char path[64];
58 char buf[32];
59 int range;
60 dev_t res;
61 char *s;
62 int len;
63 int fd;
64 unsigned int maj, min;
65
66 /* read device number from .../dev */
67
68 sprintf(path, "/sys/block/%s/dev", name);
69 fd = sys_open(path, 0, 0);
70 if (fd < 0)
71 goto fail;
72 len = sys_read(fd, buf, 32);
73 sys_close(fd);
74 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
75 goto fail;
76 buf[len - 1] = '\0';
77 if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
78 /*
79 * Try the %u:%u format -- see print_dev_t()
80 */
81 res = MKDEV(maj, min);
82 if (maj != MAJOR(res) || min != MINOR(res))
83 goto fail;
84 } else {
85 /*
86 * Nope. Try old-style "0321"
87 */
88 res = new_decode_dev(simple_strtoul(buf, &s, 16));
89 if (*s)
90 goto fail;
91 }
92
93 /* if it's there and we are not looking for a partition - that's it */
94 if (!part)
95 return res;
96
97 /* otherwise read range from .../range */
98 sprintf(path, "/sys/block/%s/range", name);
99 fd = sys_open(path, 0, 0);
100 if (fd < 0)
101 goto fail;
102 len = sys_read(fd, buf, 32);
103 sys_close(fd);
104 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
105 goto fail;
106 buf[len - 1] = '\0';
107 range = simple_strtoul(buf, &s, 10);
108 if (*s)
109 goto fail;
110
111 /* if partition is within range - we got it */
112 if (part < range)
113 return res + part;
114fail:
115 return 0;
116}
117
118/*
119 * Convert a name into device number. We accept the following variants:
120 *
121 * 1) device number in hexadecimal represents itself
122 * 2) /dev/nfs represents Root_NFS (0xff)
123 * 3) /dev/<disk_name> represents the device number of disk
124 * 4) /dev/<disk_name><decimal> represents the device number
125 * of partition - device number of disk plus the partition number
126 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
127 * used when disk name of partitioned disk ends on a digit.
128 *
129 * If name doesn't have fall into the categories above, we return 0.
Rolf Eike Beer13ae6d82005-09-02 09:03:09 +0200130 * Sysfs is used to check if something is a disk name - it has
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 * all known disks under bus/block/devices. If the disk name
Rolf Eike Beer13ae6d82005-09-02 09:03:09 +0200132 * contains slashes, name of sysfs node has them replaced with
133 * bangs. try_name() does the actual checks, assuming that sysfs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 * is mounted on rootfs /sys.
135 */
136
137dev_t name_to_dev_t(char *name)
138{
139 char s[32];
140 char *p;
141 dev_t res = 0;
142 int part;
143
144#ifdef CONFIG_SYSFS
145 int mkdir_err = sys_mkdir("/sys", 0700);
146 if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
147 goto out;
148#endif
149
150 if (strncmp(name, "/dev/", 5) != 0) {
151 unsigned maj, min;
152
153 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
154 res = MKDEV(maj, min);
155 if (maj != MAJOR(res) || min != MINOR(res))
156 goto fail;
157 } else {
158 res = new_decode_dev(simple_strtoul(name, &p, 16));
159 if (*p)
160 goto fail;
161 }
162 goto done;
163 }
164 name += 5;
165 res = Root_NFS;
166 if (strcmp(name, "nfs") == 0)
167 goto done;
168 res = Root_RAM0;
169 if (strcmp(name, "ram") == 0)
170 goto done;
171
172 if (strlen(name) > 31)
173 goto fail;
174 strcpy(s, name);
175 for (p = s; *p; p++)
176 if (*p == '/')
177 *p = '!';
178 res = try_name(s, 0);
179 if (res)
180 goto done;
181
182 while (p > s && isdigit(p[-1]))
183 p--;
184 if (p == s || !*p || *p == '0')
185 goto fail;
186 part = simple_strtoul(p, NULL, 10);
187 *p = '\0';
188 res = try_name(s, part);
189 if (res)
190 goto done;
191
192 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
193 goto fail;
194 p[-1] = '\0';
195 res = try_name(s, part);
196done:
197#ifdef CONFIG_SYSFS
198 sys_umount("/sys", 0);
199out:
200 if (!mkdir_err)
201 sys_rmdir("/sys");
202#endif
203 return res;
204fail:
205 res = 0;
206 goto done;
207}
208
209static int __init root_dev_setup(char *line)
210{
211 strlcpy(saved_root_name, line, sizeof(saved_root_name));
212 return 1;
213}
214
215__setup("root=", root_dev_setup);
216
217static char * __initdata root_mount_data;
218static int __init root_data_setup(char *str)
219{
220 root_mount_data = str;
221 return 1;
222}
223
224static char * __initdata root_fs_names;
225static int __init fs_names_setup(char *str)
226{
227 root_fs_names = str;
228 return 1;
229}
230
231static unsigned int __initdata root_delay;
232static int __init root_delay_setup(char *str)
233{
234 root_delay = simple_strtoul(str, NULL, 0);
235 return 1;
236}
237
238__setup("rootflags=", root_data_setup);
239__setup("rootfstype=", fs_names_setup);
240__setup("rootdelay=", root_delay_setup);
241
242static void __init get_fs_names(char *page)
243{
244 char *s = page;
245
246 if (root_fs_names) {
247 strcpy(page, root_fs_names);
248 while (*s++) {
249 if (s[-1] == ',')
250 s[-1] = '\0';
251 }
252 } else {
253 int len = get_filesystem_list(page);
254 char *p, *next;
255
256 page[len] = '\0';
257 for (p = page-1; p; p = next) {
258 next = strchr(++p, '\n');
259 if (*p++ != '\t')
260 continue;
261 while ((*s++ = *p++) != '\n')
262 ;
263 s[-1] = '\0';
264 }
265 }
266 *s = '\0';
267}
268
269static int __init do_mount_root(char *name, char *fs, int flags, void *data)
270{
271 int err = sys_mount(name, "/root", fs, flags, data);
272 if (err)
273 return err;
274
275 sys_chdir("/root");
276 ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
277 printk("VFS: Mounted root (%s filesystem)%s.\n",
278 current->fs->pwdmnt->mnt_sb->s_type->name,
279 current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
280 " readonly" : "");
281 return 0;
282}
283
284void __init mount_block_root(char *name, int flags)
285{
286 char *fs_names = __getname();
287 char *p;
David Howells93614012006-09-30 20:45:40 +0200288#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 char b[BDEVNAME_SIZE];
David Howells93614012006-09-30 20:45:40 +0200290#else
291 const char *b = name;
292#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294 get_fs_names(fs_names);
295retry:
296 for (p = fs_names; *p; p += strlen(p)+1) {
297 int err = do_mount_root(name, p, flags, root_mount_data);
298 switch (err) {
299 case 0:
300 goto out;
301 case -EACCES:
302 flags |= MS_RDONLY;
303 goto retry;
304 case -EINVAL:
305 continue;
306 }
307 /*
308 * Allow the user to distinguish between failed sys_open
309 * and bad superblock on root device.
310 */
David Howells93614012006-09-30 20:45:40 +0200311#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 __bdevname(ROOT_DEV, b);
David Howells93614012006-09-30 20:45:40 +0200313#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 printk("VFS: Cannot open root device \"%s\" or %s\n",
315 root_device_name, b);
316 printk("Please append a correct \"root=\" boot option\n");
317
318 panic("VFS: Unable to mount root fs on %s", b);
319 }
Andy Whitcroftbe6e0282006-05-15 09:44:29 -0700320
321 printk("No filesystem could mount root, tried: ");
322 for (p = fs_names; *p; p += strlen(p)+1)
323 printk(" %s", p);
324 printk("\n");
David Howells93614012006-09-30 20:45:40 +0200325#ifdef CONFIG_BLOCK
326 __bdevname(ROOT_DEV, b);
327#endif
328 panic("VFS: Unable to mount root fs on %s", b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329out:
330 putname(fs_names);
331}
332
333#ifdef CONFIG_ROOT_NFS
334static int __init mount_nfs_root(void)
335{
336 void *data = nfs_root_data();
337
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700338 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 if (data &&
340 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
341 return 1;
342 return 0;
343}
344#endif
345
346#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
347void __init change_floppy(char *fmt, ...)
348{
349 struct termios termios;
350 char buf[80];
351 char c;
352 int fd;
353 va_list args;
354 va_start(args, fmt);
355 vsprintf(buf, fmt, args);
356 va_end(args);
357 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
358 if (fd >= 0) {
359 sys_ioctl(fd, FDEJECT, 0);
360 sys_close(fd);
361 }
362 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
363 fd = sys_open("/dev/console", O_RDWR, 0);
364 if (fd >= 0) {
365 sys_ioctl(fd, TCGETS, (long)&termios);
366 termios.c_lflag &= ~ICANON;
367 sys_ioctl(fd, TCSETSF, (long)&termios);
368 sys_read(fd, &c, 1);
369 termios.c_lflag |= ICANON;
370 sys_ioctl(fd, TCSETSF, (long)&termios);
371 sys_close(fd);
372 }
373}
374#endif
375
376void __init mount_root(void)
377{
378#ifdef CONFIG_ROOT_NFS
379 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
380 if (mount_nfs_root())
381 return;
382
383 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
384 ROOT_DEV = Root_FD0;
385 }
386#endif
387#ifdef CONFIG_BLK_DEV_FD
388 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
389 /* rd_doload is 2 for a dual initrd/ramload setup */
390 if (rd_doload==2) {
391 if (rd_load_disk(1)) {
392 ROOT_DEV = Root_RAM1;
393 root_device_name = NULL;
394 }
395 } else
396 change_floppy("root floppy");
397 }
398#endif
David Howells93614012006-09-30 20:45:40 +0200399#ifdef CONFIG_BLOCK
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700400 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 mount_block_root("/dev/root", root_mountflags);
David Howells93614012006-09-30 20:45:40 +0200402#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403}
404
405/*
406 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
407 */
408void __init prepare_namespace(void)
409{
410 int is_floppy;
411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 if (root_delay) {
413 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
414 root_delay);
415 ssleep(root_delay);
416 }
417
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700418 /* wait for the known devices to complete their probing */
419 while (driver_probe_done() != 0)
420 msleep(100);
421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 md_run_setup();
423
424 if (saved_root_name[0]) {
425 root_device_name = saved_root_name;
Joern Engele9482b42006-05-30 14:25:46 +0200426 if (!strncmp(root_device_name, "mtd", 3)) {
427 mount_block_root(root_device_name, root_mountflags);
428 goto out;
429 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 ROOT_DEV = name_to_dev_t(root_device_name);
431 if (strncmp(root_device_name, "/dev/", 5) == 0)
432 root_device_name += 5;
433 }
434
435 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
436
437 if (initrd_load())
438 goto out;
439
440 if (is_floppy && rd_doload && rd_load_disk(0))
441 ROOT_DEV = Root_RAM0;
442
443 mount_root();
444out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 sys_mount(".", "/", NULL, MS_MOVE, NULL);
446 sys_chroot(".");
447 security_sb_post_mountroot();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449