blob: 4efa1e5385e3a1b110b29b46ceccedf36a8c4138 [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];
Pierre Ossmancc1ed752007-07-15 23:40:35 -070028static int __initdata root_wait;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Linus Torvalds1da177e2005-04-16 15:20:36 -070030dev_t ROOT_DEV;
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032static int __init load_ramdisk(char *str)
33{
34 rd_doload = simple_strtol(str,NULL,0) & 3;
35 return 1;
36}
37__setup("load_ramdisk=", load_ramdisk);
38
39static int __init readonly(char *str)
40{
41 if (*str)
42 return 0;
43 root_mountflags |= MS_RDONLY;
44 return 1;
45}
46
47static int __init readwrite(char *str)
48{
49 if (*str)
50 return 0;
51 root_mountflags &= ~MS_RDONLY;
52 return 1;
53}
54
55__setup("ro", readonly);
56__setup("rw", readwrite);
57
58static dev_t try_name(char *name, int part)
59{
60 char path[64];
61 char buf[32];
62 int range;
63 dev_t res;
64 char *s;
65 int len;
66 int fd;
67 unsigned int maj, min;
68
69 /* read device number from .../dev */
70
71 sprintf(path, "/sys/block/%s/dev", name);
72 fd = sys_open(path, 0, 0);
73 if (fd < 0)
74 goto fail;
75 len = sys_read(fd, buf, 32);
76 sys_close(fd);
77 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
78 goto fail;
79 buf[len - 1] = '\0';
80 if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
81 /*
82 * Try the %u:%u format -- see print_dev_t()
83 */
84 res = MKDEV(maj, min);
85 if (maj != MAJOR(res) || min != MINOR(res))
86 goto fail;
87 } else {
88 /*
89 * Nope. Try old-style "0321"
90 */
91 res = new_decode_dev(simple_strtoul(buf, &s, 16));
92 if (*s)
93 goto fail;
94 }
95
96 /* if it's there and we are not looking for a partition - that's it */
97 if (!part)
98 return res;
99
100 /* otherwise read range from .../range */
101 sprintf(path, "/sys/block/%s/range", name);
102 fd = sys_open(path, 0, 0);
103 if (fd < 0)
104 goto fail;
105 len = sys_read(fd, buf, 32);
106 sys_close(fd);
107 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
108 goto fail;
109 buf[len - 1] = '\0';
110 range = simple_strtoul(buf, &s, 10);
111 if (*s)
112 goto fail;
113
114 /* if partition is within range - we got it */
115 if (part < range)
116 return res + part;
117fail:
118 return 0;
119}
120
121/*
122 * Convert a name into device number. We accept the following variants:
123 *
124 * 1) device number in hexadecimal represents itself
125 * 2) /dev/nfs represents Root_NFS (0xff)
126 * 3) /dev/<disk_name> represents the device number of disk
127 * 4) /dev/<disk_name><decimal> represents the device number
128 * of partition - device number of disk plus the partition number
129 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
130 * used when disk name of partitioned disk ends on a digit.
131 *
132 * If name doesn't have fall into the categories above, we return 0.
Rolf Eike Beer13ae6d82005-09-02 09:03:09 +0200133 * Sysfs is used to check if something is a disk name - it has
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 * all known disks under bus/block/devices. If the disk name
Rolf Eike Beer13ae6d82005-09-02 09:03:09 +0200135 * contains slashes, name of sysfs node has them replaced with
136 * bangs. try_name() does the actual checks, assuming that sysfs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 * is mounted on rootfs /sys.
138 */
139
140dev_t name_to_dev_t(char *name)
141{
142 char s[32];
143 char *p;
144 dev_t res = 0;
145 int part;
146
147#ifdef CONFIG_SYSFS
148 int mkdir_err = sys_mkdir("/sys", 0700);
149 if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
150 goto out;
151#endif
152
153 if (strncmp(name, "/dev/", 5) != 0) {
154 unsigned maj, min;
155
156 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
157 res = MKDEV(maj, min);
158 if (maj != MAJOR(res) || min != MINOR(res))
159 goto fail;
160 } else {
161 res = new_decode_dev(simple_strtoul(name, &p, 16));
162 if (*p)
163 goto fail;
164 }
165 goto done;
166 }
167 name += 5;
168 res = Root_NFS;
169 if (strcmp(name, "nfs") == 0)
170 goto done;
171 res = Root_RAM0;
172 if (strcmp(name, "ram") == 0)
173 goto done;
174
175 if (strlen(name) > 31)
176 goto fail;
177 strcpy(s, name);
178 for (p = s; *p; p++)
179 if (*p == '/')
180 *p = '!';
181 res = try_name(s, 0);
182 if (res)
183 goto done;
184
185 while (p > s && isdigit(p[-1]))
186 p--;
187 if (p == s || !*p || *p == '0')
188 goto fail;
189 part = simple_strtoul(p, NULL, 10);
190 *p = '\0';
191 res = try_name(s, part);
192 if (res)
193 goto done;
194
195 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
196 goto fail;
197 p[-1] = '\0';
198 res = try_name(s, part);
199done:
200#ifdef CONFIG_SYSFS
201 sys_umount("/sys", 0);
202out:
203 if (!mkdir_err)
204 sys_rmdir("/sys");
205#endif
206 return res;
207fail:
208 res = 0;
209 goto done;
210}
211
212static int __init root_dev_setup(char *line)
213{
214 strlcpy(saved_root_name, line, sizeof(saved_root_name));
215 return 1;
216}
217
218__setup("root=", root_dev_setup);
219
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700220static int __init rootwait_setup(char *str)
221{
222 if (*str)
223 return 0;
224 root_wait = 1;
225 return 1;
226}
227
228__setup("rootwait", rootwait_setup);
229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230static char * __initdata root_mount_data;
231static int __init root_data_setup(char *str)
232{
233 root_mount_data = str;
234 return 1;
235}
236
237static char * __initdata root_fs_names;
238static int __init fs_names_setup(char *str)
239{
240 root_fs_names = str;
241 return 1;
242}
243
244static unsigned int __initdata root_delay;
245static int __init root_delay_setup(char *str)
246{
247 root_delay = simple_strtoul(str, NULL, 0);
248 return 1;
249}
250
251__setup("rootflags=", root_data_setup);
252__setup("rootfstype=", fs_names_setup);
253__setup("rootdelay=", root_delay_setup);
254
255static void __init get_fs_names(char *page)
256{
257 char *s = page;
258
259 if (root_fs_names) {
260 strcpy(page, root_fs_names);
261 while (*s++) {
262 if (s[-1] == ',')
263 s[-1] = '\0';
264 }
265 } else {
266 int len = get_filesystem_list(page);
267 char *p, *next;
268
269 page[len] = '\0';
270 for (p = page-1; p; p = next) {
271 next = strchr(++p, '\n');
272 if (*p++ != '\t')
273 continue;
274 while ((*s++ = *p++) != '\n')
275 ;
276 s[-1] = '\0';
277 }
278 }
279 *s = '\0';
280}
281
282static int __init do_mount_root(char *name, char *fs, int flags, void *data)
283{
284 int err = sys_mount(name, "/root", fs, flags, data);
285 if (err)
286 return err;
287
288 sys_chdir("/root");
289 ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
290 printk("VFS: Mounted root (%s filesystem)%s.\n",
291 current->fs->pwdmnt->mnt_sb->s_type->name,
292 current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
293 " readonly" : "");
294 return 0;
295}
296
297void __init mount_block_root(char *name, int flags)
298{
299 char *fs_names = __getname();
300 char *p;
David Howells93614012006-09-30 20:45:40 +0200301#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 char b[BDEVNAME_SIZE];
David Howells93614012006-09-30 20:45:40 +0200303#else
304 const char *b = name;
305#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 get_fs_names(fs_names);
308retry:
309 for (p = fs_names; *p; p += strlen(p)+1) {
310 int err = do_mount_root(name, p, flags, root_mount_data);
311 switch (err) {
312 case 0:
313 goto out;
314 case -EACCES:
315 flags |= MS_RDONLY;
316 goto retry;
317 case -EINVAL:
318 continue;
319 }
320 /*
321 * Allow the user to distinguish between failed sys_open
322 * and bad superblock on root device.
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700323 * and give them a list of the available devices
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 */
David Howells93614012006-09-30 20:45:40 +0200325#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 __bdevname(ROOT_DEV, b);
David Howells93614012006-09-30 20:45:40 +0200327#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 printk("VFS: Cannot open root device \"%s\" or %s\n",
329 root_device_name, b);
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700330 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700332 printk_all_partitions();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 panic("VFS: Unable to mount root fs on %s", b);
334 }
Andy Whitcroftbe6e028b2006-05-15 09:44:29 -0700335
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700336 printk("List of all partitions:\n");
337 printk_all_partitions();
Andy Whitcroftbe6e028b2006-05-15 09:44:29 -0700338 printk("No filesystem could mount root, tried: ");
339 for (p = fs_names; *p; p += strlen(p)+1)
340 printk(" %s", p);
341 printk("\n");
David Howells93614012006-09-30 20:45:40 +0200342#ifdef CONFIG_BLOCK
343 __bdevname(ROOT_DEV, b);
344#endif
345 panic("VFS: Unable to mount root fs on %s", b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346out:
347 putname(fs_names);
348}
349
350#ifdef CONFIG_ROOT_NFS
351static int __init mount_nfs_root(void)
352{
353 void *data = nfs_root_data();
354
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700355 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 if (data &&
357 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
358 return 1;
359 return 0;
360}
361#endif
362
363#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
364void __init change_floppy(char *fmt, ...)
365{
366 struct termios termios;
367 char buf[80];
368 char c;
369 int fd;
370 va_list args;
371 va_start(args, fmt);
372 vsprintf(buf, fmt, args);
373 va_end(args);
374 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
375 if (fd >= 0) {
376 sys_ioctl(fd, FDEJECT, 0);
377 sys_close(fd);
378 }
379 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
380 fd = sys_open("/dev/console", O_RDWR, 0);
381 if (fd >= 0) {
382 sys_ioctl(fd, TCGETS, (long)&termios);
383 termios.c_lflag &= ~ICANON;
384 sys_ioctl(fd, TCSETSF, (long)&termios);
385 sys_read(fd, &c, 1);
386 termios.c_lflag |= ICANON;
387 sys_ioctl(fd, TCSETSF, (long)&termios);
388 sys_close(fd);
389 }
390}
391#endif
392
393void __init mount_root(void)
394{
395#ifdef CONFIG_ROOT_NFS
396 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
397 if (mount_nfs_root())
398 return;
399
400 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
401 ROOT_DEV = Root_FD0;
402 }
403#endif
404#ifdef CONFIG_BLK_DEV_FD
405 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
406 /* rd_doload is 2 for a dual initrd/ramload setup */
407 if (rd_doload==2) {
408 if (rd_load_disk(1)) {
409 ROOT_DEV = Root_RAM1;
410 root_device_name = NULL;
411 }
412 } else
413 change_floppy("root floppy");
414 }
415#endif
David Howells93614012006-09-30 20:45:40 +0200416#ifdef CONFIG_BLOCK
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700417 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 mount_block_root("/dev/root", root_mountflags);
David Howells93614012006-09-30 20:45:40 +0200419#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420}
421
422/*
423 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
424 */
425void __init prepare_namespace(void)
426{
427 int is_floppy;
428
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 if (root_delay) {
430 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
431 root_delay);
432 ssleep(root_delay);
433 }
434
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700435 /* wait for the known devices to complete their probing */
436 while (driver_probe_done() != 0)
437 msleep(100);
438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 md_run_setup();
440
441 if (saved_root_name[0]) {
442 root_device_name = saved_root_name;
Joern Engele9482b42006-05-30 14:25:46 +0200443 if (!strncmp(root_device_name, "mtd", 3)) {
444 mount_block_root(root_device_name, root_mountflags);
445 goto out;
446 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 ROOT_DEV = name_to_dev_t(root_device_name);
448 if (strncmp(root_device_name, "/dev/", 5) == 0)
449 root_device_name += 5;
450 }
451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 if (initrd_load())
453 goto out;
454
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700455 /* wait for any asynchronous scanning to complete */
456 if ((ROOT_DEV == 0) && root_wait) {
457 printk(KERN_INFO "Waiting for root device %s...\n",
458 saved_root_name);
459 while (driver_probe_done() != 0 ||
460 (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
461 msleep(100);
462 }
463
464 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 if (is_floppy && rd_doload && rd_load_disk(0))
467 ROOT_DEV = Root_RAM0;
468
469 mount_root();
470out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 sys_mount(".", "/", NULL, MS_MOVE, NULL);
472 sys_chroot(".");
473 security_sb_post_mountroot();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474}
475