blob: 708105e163df8fbbbe69c7fc74a29693d6f3ed58 [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>
Adrian Bunk011e3fc2008-02-06 01:36:47 -080014#include <linux/fs.h>
Adrian Bunk82c82532008-07-25 01:45:29 -070015#include <linux/initrd.h>
Arjan van de Ven22a9d642009-01-07 08:45:46 -080016#include <linux/async.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18#include <linux/nfs_fs.h>
19#include <linux/nfs_fs_sb.h>
20#include <linux/nfs_mount.h>
21
22#include "do_mounts.h"
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
25
Theodore Ts'o9b04c992006-03-24 03:15:10 -080026int root_mountflags = MS_RDONLY | MS_SILENT;
Adrian Bunkf56f6d302008-07-25 19:46:25 -070027static char * __initdata root_device_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028static char __initdata saved_root_name[64];
Pierre Ossmancc1ed752007-07-15 23:40:35 -070029static int __initdata root_wait;
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Linus Torvalds1da177e2005-04-16 15:20:36 -070031dev_t ROOT_DEV;
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033static int __init load_ramdisk(char *str)
34{
35 rd_doload = simple_strtol(str,NULL,0) & 3;
36 return 1;
37}
38__setup("load_ramdisk=", load_ramdisk);
39
40static int __init readonly(char *str)
41{
42 if (*str)
43 return 0;
44 root_mountflags |= MS_RDONLY;
45 return 1;
46}
47
48static int __init readwrite(char *str)
49{
50 if (*str)
51 return 0;
52 root_mountflags &= ~MS_RDONLY;
53 return 1;
54}
55
56__setup("ro", readonly);
57__setup("rw", readwrite);
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059/*
60 * Convert a name into device number. We accept the following variants:
61 *
62 * 1) device number in hexadecimal represents itself
63 * 2) /dev/nfs represents Root_NFS (0xff)
64 * 3) /dev/<disk_name> represents the device number of disk
65 * 4) /dev/<disk_name><decimal> represents the device number
66 * of partition - device number of disk plus the partition number
67 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
68 * used when disk name of partitioned disk ends on a digit.
69 *
Kay Sieversedfaa7c2007-05-21 22:08:01 +020070 * If name doesn't have fall into the categories above, we return (0,0).
71 * block_class is used to check if something is a disk name. If the disk
72 * name contains slashes, the device name has them replaced with
73 * bangs.
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 */
75
76dev_t name_to_dev_t(char *name)
77{
78 char s[32];
79 char *p;
80 dev_t res = 0;
Kay Sievers30f2f0e2008-05-06 22:31:33 +020081 int part;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83 if (strncmp(name, "/dev/", 5) != 0) {
84 unsigned maj, min;
85
86 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
87 res = MKDEV(maj, min);
88 if (maj != MAJOR(res) || min != MINOR(res))
89 goto fail;
90 } else {
91 res = new_decode_dev(simple_strtoul(name, &p, 16));
92 if (*p)
93 goto fail;
94 }
95 goto done;
96 }
Kay Sieversedfaa7c2007-05-21 22:08:01 +020097
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 name += 5;
99 res = Root_NFS;
100 if (strcmp(name, "nfs") == 0)
101 goto done;
102 res = Root_RAM0;
103 if (strcmp(name, "ram") == 0)
104 goto done;
105
106 if (strlen(name) > 31)
107 goto fail;
108 strcpy(s, name);
109 for (p = s; *p; p++)
110 if (*p == '/')
111 *p = '!';
Kay Sievers30f2f0e2008-05-06 22:31:33 +0200112 res = blk_lookup_devt(s, 0);
113 if (res)
114 goto done;
115
116 /*
117 * try non-existant, but valid partition, which may only exist
118 * after revalidating the disk, like partitioned md devices
119 */
120 while (p > s && isdigit(p[-1]))
121 p--;
122 if (p == s || !*p || *p == '0')
123 goto fail;
124
125 /* try disk name without <part number> */
126 part = simple_strtoul(p, NULL, 10);
127 *p = '\0';
128 res = blk_lookup_devt(s, part);
129 if (res)
130 goto done;
131
132 /* try disk name without p<part number> */
133 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
134 goto fail;
135 p[-1] = '\0';
136 res = blk_lookup_devt(s, part);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 if (res)
138 goto done;
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140fail:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200141 return 0;
142done:
143 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
145
146static int __init root_dev_setup(char *line)
147{
148 strlcpy(saved_root_name, line, sizeof(saved_root_name));
149 return 1;
150}
151
152__setup("root=", root_dev_setup);
153
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700154static int __init rootwait_setup(char *str)
155{
156 if (*str)
157 return 0;
158 root_wait = 1;
159 return 1;
160}
161
162__setup("rootwait", rootwait_setup);
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164static char * __initdata root_mount_data;
165static int __init root_data_setup(char *str)
166{
167 root_mount_data = str;
168 return 1;
169}
170
171static char * __initdata root_fs_names;
172static int __init fs_names_setup(char *str)
173{
174 root_fs_names = str;
175 return 1;
176}
177
178static unsigned int __initdata root_delay;
179static int __init root_delay_setup(char *str)
180{
181 root_delay = simple_strtoul(str, NULL, 0);
182 return 1;
183}
184
185__setup("rootflags=", root_data_setup);
186__setup("rootfstype=", fs_names_setup);
187__setup("rootdelay=", root_delay_setup);
188
189static void __init get_fs_names(char *page)
190{
191 char *s = page;
192
193 if (root_fs_names) {
194 strcpy(page, root_fs_names);
195 while (*s++) {
196 if (s[-1] == ',')
197 s[-1] = '\0';
198 }
199 } else {
200 int len = get_filesystem_list(page);
201 char *p, *next;
202
203 page[len] = '\0';
204 for (p = page-1; p; p = next) {
205 next = strchr(++p, '\n');
206 if (*p++ != '\t')
207 continue;
208 while ((*s++ = *p++) != '\n')
209 ;
210 s[-1] = '\0';
211 }
212 }
213 *s = '\0';
214}
215
216static int __init do_mount_root(char *name, char *fs, int flags, void *data)
217{
218 int err = sys_mount(name, "/root", fs, flags, data);
219 if (err)
220 return err;
221
222 sys_chdir("/root");
Jan Blunck6ac08c32008-02-14 19:34:38 -0800223 ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
Marton Balintbca10332009-01-06 14:40:43 -0800224 printk("VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
Jan Blunck6ac08c32008-02-14 19:34:38 -0800225 current->fs->pwd.mnt->mnt_sb->s_type->name,
226 current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
Marton Balintbca10332009-01-06 14:40:43 -0800227 " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return 0;
229}
230
231void __init mount_block_root(char *name, int flags)
232{
233 char *fs_names = __getname();
234 char *p;
David Howells93614012006-09-30 20:45:40 +0200235#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 char b[BDEVNAME_SIZE];
David Howells93614012006-09-30 20:45:40 +0200237#else
238 const char *b = name;
239#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 get_fs_names(fs_names);
242retry:
243 for (p = fs_names; *p; p += strlen(p)+1) {
244 int err = do_mount_root(name, p, flags, root_mount_data);
245 switch (err) {
246 case 0:
247 goto out;
248 case -EACCES:
249 flags |= MS_RDONLY;
250 goto retry;
251 case -EINVAL:
252 continue;
253 }
254 /*
255 * Allow the user to distinguish between failed sys_open
256 * and bad superblock on root device.
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700257 * and give them a list of the available devices
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 */
David Howells93614012006-09-30 20:45:40 +0200259#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 __bdevname(ROOT_DEV, b);
David Howells93614012006-09-30 20:45:40 +0200261#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 printk("VFS: Cannot open root device \"%s\" or %s\n",
263 root_device_name, b);
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700264 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700266 printk_all_partitions();
Tejun Heo55dc7db2008-09-01 13:44:35 +0200267#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
268 printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
269 "explicit textual name for \"root=\" boot option.\n");
270#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 panic("VFS: Unable to mount root fs on %s", b);
272 }
Andy Whitcroftbe6e028b2006-05-15 09:44:29 -0700273
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700274 printk("List of all partitions:\n");
275 printk_all_partitions();
Andy Whitcroftbe6e028b2006-05-15 09:44:29 -0700276 printk("No filesystem could mount root, tried: ");
277 for (p = fs_names; *p; p += strlen(p)+1)
278 printk(" %s", p);
279 printk("\n");
David Howells93614012006-09-30 20:45:40 +0200280#ifdef CONFIG_BLOCK
281 __bdevname(ROOT_DEV, b);
282#endif
283 panic("VFS: Unable to mount root fs on %s", b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284out:
285 putname(fs_names);
286}
287
288#ifdef CONFIG_ROOT_NFS
289static int __init mount_nfs_root(void)
290{
291 void *data = nfs_root_data();
292
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700293 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (data &&
295 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
296 return 1;
297 return 0;
298}
299#endif
300
301#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
302void __init change_floppy(char *fmt, ...)
303{
304 struct termios termios;
305 char buf[80];
306 char c;
307 int fd;
308 va_list args;
309 va_start(args, fmt);
310 vsprintf(buf, fmt, args);
311 va_end(args);
312 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
313 if (fd >= 0) {
314 sys_ioctl(fd, FDEJECT, 0);
315 sys_close(fd);
316 }
317 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
318 fd = sys_open("/dev/console", O_RDWR, 0);
319 if (fd >= 0) {
320 sys_ioctl(fd, TCGETS, (long)&termios);
321 termios.c_lflag &= ~ICANON;
322 sys_ioctl(fd, TCSETSF, (long)&termios);
323 sys_read(fd, &c, 1);
324 termios.c_lflag |= ICANON;
325 sys_ioctl(fd, TCSETSF, (long)&termios);
326 sys_close(fd);
327 }
328}
329#endif
330
331void __init mount_root(void)
332{
333#ifdef CONFIG_ROOT_NFS
334 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
335 if (mount_nfs_root())
336 return;
337
338 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
339 ROOT_DEV = Root_FD0;
340 }
341#endif
342#ifdef CONFIG_BLK_DEV_FD
343 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
344 /* rd_doload is 2 for a dual initrd/ramload setup */
345 if (rd_doload==2) {
346 if (rd_load_disk(1)) {
347 ROOT_DEV = Root_RAM1;
348 root_device_name = NULL;
349 }
350 } else
351 change_floppy("root floppy");
352 }
353#endif
David Howells93614012006-09-30 20:45:40 +0200354#ifdef CONFIG_BLOCK
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700355 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 mount_block_root("/dev/root", root_mountflags);
David Howells93614012006-09-30 20:45:40 +0200357#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358}
359
360/*
361 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
362 */
363void __init prepare_namespace(void)
364{
365 int is_floppy;
366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 if (root_delay) {
368 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
369 root_delay);
370 ssleep(root_delay);
371 }
372
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700373 /* wait for the known devices to complete their probing */
374 while (driver_probe_done() != 0)
375 msleep(100);
Arjan van de Ven22a9d642009-01-07 08:45:46 -0800376 async_synchronize_full();
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 md_run_setup();
379
380 if (saved_root_name[0]) {
381 root_device_name = saved_root_name;
Adrian Hunter2d62f482008-01-31 17:25:00 +0200382 if (!strncmp(root_device_name, "mtd", 3) ||
383 !strncmp(root_device_name, "ubi", 3)) {
Joern Engele9482b42006-05-30 14:25:46 +0200384 mount_block_root(root_device_name, root_mountflags);
385 goto out;
386 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 ROOT_DEV = name_to_dev_t(root_device_name);
388 if (strncmp(root_device_name, "/dev/", 5) == 0)
389 root_device_name += 5;
390 }
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 if (initrd_load())
393 goto out;
394
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700395 /* wait for any asynchronous scanning to complete */
396 if ((ROOT_DEV == 0) && root_wait) {
397 printk(KERN_INFO "Waiting for root device %s...\n",
398 saved_root_name);
399 while (driver_probe_done() != 0 ||
400 (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
401 msleep(100);
402 }
403
404 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 if (is_floppy && rd_doload && rd_load_disk(0))
407 ROOT_DEV = Root_RAM0;
408
409 mount_root();
410out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 sys_mount(".", "/", NULL, MS_MOVE, NULL);
412 sys_chroot(".");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413}
414