blob: d055b1914c3d3b696237a04bb352ed5dbb7e14c6 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17#include <linux/nfs_fs.h>
18#include <linux/nfs_fs_sb.h>
19#include <linux/nfs_mount.h>
20
21#include "do_mounts.h"
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023int __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;
Adrian Bunkf56f6d32008-07-25 19:46:25 -070026static char * __initdata root_device_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -070027static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070058/*
59 * Convert a name into device number. We accept the following variants:
60 *
61 * 1) device number in hexadecimal represents itself
62 * 2) /dev/nfs represents Root_NFS (0xff)
63 * 3) /dev/<disk_name> represents the device number of disk
64 * 4) /dev/<disk_name><decimal> represents the device number
65 * of partition - device number of disk plus the partition number
66 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
67 * used when disk name of partitioned disk ends on a digit.
68 *
Kay Sieversedfaa7c2007-05-21 22:08:01 +020069 * If name doesn't have fall into the categories above, we return (0,0).
70 * block_class is used to check if something is a disk name. If the disk
71 * name contains slashes, the device name has them replaced with
72 * bangs.
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 */
74
75dev_t name_to_dev_t(char *name)
76{
77 char s[32];
78 char *p;
79 dev_t res = 0;
Kay Sievers30f2f0e2008-05-06 22:31:33 +020080 int part;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 if (strncmp(name, "/dev/", 5) != 0) {
83 unsigned maj, min;
84
85 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
86 res = MKDEV(maj, min);
87 if (maj != MAJOR(res) || min != MINOR(res))
88 goto fail;
89 } else {
90 res = new_decode_dev(simple_strtoul(name, &p, 16));
91 if (*p)
92 goto fail;
93 }
94 goto done;
95 }
Kay Sieversedfaa7c2007-05-21 22:08:01 +020096
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 name += 5;
98 res = Root_NFS;
99 if (strcmp(name, "nfs") == 0)
100 goto done;
101 res = Root_RAM0;
102 if (strcmp(name, "ram") == 0)
103 goto done;
104
105 if (strlen(name) > 31)
106 goto fail;
107 strcpy(s, name);
108 for (p = s; *p; p++)
109 if (*p == '/')
110 *p = '!';
Kay Sievers30f2f0e2008-05-06 22:31:33 +0200111 res = blk_lookup_devt(s, 0);
112 if (res)
113 goto done;
114
115 /*
116 * try non-existant, but valid partition, which may only exist
117 * after revalidating the disk, like partitioned md devices
118 */
119 while (p > s && isdigit(p[-1]))
120 p--;
121 if (p == s || !*p || *p == '0')
122 goto fail;
123
124 /* try disk name without <part number> */
125 part = simple_strtoul(p, NULL, 10);
126 *p = '\0';
127 res = blk_lookup_devt(s, part);
128 if (res)
129 goto done;
130
131 /* try disk name without p<part number> */
132 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
133 goto fail;
134 p[-1] = '\0';
135 res = blk_lookup_devt(s, part);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 if (res)
137 goto done;
138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139fail:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200140 return 0;
141done:
142 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143}
144
145static int __init root_dev_setup(char *line)
146{
147 strlcpy(saved_root_name, line, sizeof(saved_root_name));
148 return 1;
149}
150
151__setup("root=", root_dev_setup);
152
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700153static int __init rootwait_setup(char *str)
154{
155 if (*str)
156 return 0;
157 root_wait = 1;
158 return 1;
159}
160
161__setup("rootwait", rootwait_setup);
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163static char * __initdata root_mount_data;
164static int __init root_data_setup(char *str)
165{
166 root_mount_data = str;
167 return 1;
168}
169
170static char * __initdata root_fs_names;
171static int __init fs_names_setup(char *str)
172{
173 root_fs_names = str;
174 return 1;
175}
176
177static unsigned int __initdata root_delay;
178static int __init root_delay_setup(char *str)
179{
180 root_delay = simple_strtoul(str, NULL, 0);
181 return 1;
182}
183
184__setup("rootflags=", root_data_setup);
185__setup("rootfstype=", fs_names_setup);
186__setup("rootdelay=", root_delay_setup);
187
188static void __init get_fs_names(char *page)
189{
190 char *s = page;
191
192 if (root_fs_names) {
193 strcpy(page, root_fs_names);
194 while (*s++) {
195 if (s[-1] == ',')
196 s[-1] = '\0';
197 }
198 } else {
199 int len = get_filesystem_list(page);
200 char *p, *next;
201
202 page[len] = '\0';
203 for (p = page-1; p; p = next) {
204 next = strchr(++p, '\n');
205 if (*p++ != '\t')
206 continue;
207 while ((*s++ = *p++) != '\n')
208 ;
209 s[-1] = '\0';
210 }
211 }
212 *s = '\0';
213}
214
215static int __init do_mount_root(char *name, char *fs, int flags, void *data)
216{
217 int err = sys_mount(name, "/root", fs, flags, data);
218 if (err)
219 return err;
220
221 sys_chdir("/root");
Jan Blunck6ac08c32008-02-14 19:34:38 -0800222 ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 printk("VFS: Mounted root (%s filesystem)%s.\n",
Jan Blunck6ac08c32008-02-14 19:34:38 -0800224 current->fs->pwd.mnt->mnt_sb->s_type->name,
225 current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 " readonly" : "");
227 return 0;
228}
229
230void __init mount_block_root(char *name, int flags)
231{
232 char *fs_names = __getname();
233 char *p;
David Howells93614012006-09-30 20:45:40 +0200234#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 char b[BDEVNAME_SIZE];
David Howells93614012006-09-30 20:45:40 +0200236#else
237 const char *b = name;
238#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240 get_fs_names(fs_names);
241retry:
242 for (p = fs_names; *p; p += strlen(p)+1) {
243 int err = do_mount_root(name, p, flags, root_mount_data);
244 switch (err) {
245 case 0:
246 goto out;
247 case -EACCES:
248 flags |= MS_RDONLY;
249 goto retry;
250 case -EINVAL:
251 continue;
252 }
253 /*
254 * Allow the user to distinguish between failed sys_open
255 * and bad superblock on root device.
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700256 * and give them a list of the available devices
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 */
David Howells93614012006-09-30 20:45:40 +0200258#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 __bdevname(ROOT_DEV, b);
David Howells93614012006-09-30 20:45:40 +0200260#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 printk("VFS: Cannot open root device \"%s\" or %s\n",
262 root_device_name, b);
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700263 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700265 printk_all_partitions();
Tejun Heo55dc7db2008-09-01 13:44:35 +0200266#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
267 printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
268 "explicit textual name for \"root=\" boot option.\n");
269#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 panic("VFS: Unable to mount root fs on %s", b);
271 }
Andy Whitcroftbe6e0282006-05-15 09:44:29 -0700272
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700273 printk("List of all partitions:\n");
274 printk_all_partitions();
Andy Whitcroftbe6e0282006-05-15 09:44:29 -0700275 printk("No filesystem could mount root, tried: ");
276 for (p = fs_names; *p; p += strlen(p)+1)
277 printk(" %s", p);
278 printk("\n");
David Howells93614012006-09-30 20:45:40 +0200279#ifdef CONFIG_BLOCK
280 __bdevname(ROOT_DEV, b);
281#endif
282 panic("VFS: Unable to mount root fs on %s", b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283out:
284 putname(fs_names);
285}
286
287#ifdef CONFIG_ROOT_NFS
288static int __init mount_nfs_root(void)
289{
290 void *data = nfs_root_data();
291
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700292 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 if (data &&
294 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
295 return 1;
296 return 0;
297}
298#endif
299
300#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
301void __init change_floppy(char *fmt, ...)
302{
303 struct termios termios;
304 char buf[80];
305 char c;
306 int fd;
307 va_list args;
308 va_start(args, fmt);
309 vsprintf(buf, fmt, args);
310 va_end(args);
311 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
312 if (fd >= 0) {
313 sys_ioctl(fd, FDEJECT, 0);
314 sys_close(fd);
315 }
316 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
317 fd = sys_open("/dev/console", O_RDWR, 0);
318 if (fd >= 0) {
319 sys_ioctl(fd, TCGETS, (long)&termios);
320 termios.c_lflag &= ~ICANON;
321 sys_ioctl(fd, TCSETSF, (long)&termios);
322 sys_read(fd, &c, 1);
323 termios.c_lflag |= ICANON;
324 sys_ioctl(fd, TCSETSF, (long)&termios);
325 sys_close(fd);
326 }
327}
328#endif
329
330void __init mount_root(void)
331{
332#ifdef CONFIG_ROOT_NFS
333 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
334 if (mount_nfs_root())
335 return;
336
337 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
338 ROOT_DEV = Root_FD0;
339 }
340#endif
341#ifdef CONFIG_BLK_DEV_FD
342 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
343 /* rd_doload is 2 for a dual initrd/ramload setup */
344 if (rd_doload==2) {
345 if (rd_load_disk(1)) {
346 ROOT_DEV = Root_RAM1;
347 root_device_name = NULL;
348 }
349 } else
350 change_floppy("root floppy");
351 }
352#endif
David Howells93614012006-09-30 20:45:40 +0200353#ifdef CONFIG_BLOCK
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700354 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 mount_block_root("/dev/root", root_mountflags);
David Howells93614012006-09-30 20:45:40 +0200356#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358
359/*
360 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
361 */
362void __init prepare_namespace(void)
363{
364 int is_floppy;
365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 if (root_delay) {
367 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
368 root_delay);
369 ssleep(root_delay);
370 }
371
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700372 /* wait for the known devices to complete their probing */
373 while (driver_probe_done() != 0)
374 msleep(100);
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 md_run_setup();
377
378 if (saved_root_name[0]) {
379 root_device_name = saved_root_name;
Adrian Hunter2d62f482008-01-31 17:25:00 +0200380 if (!strncmp(root_device_name, "mtd", 3) ||
381 !strncmp(root_device_name, "ubi", 3)) {
Joern Engele9482b42006-05-30 14:25:46 +0200382 mount_block_root(root_device_name, root_mountflags);
383 goto out;
384 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 ROOT_DEV = name_to_dev_t(root_device_name);
386 if (strncmp(root_device_name, "/dev/", 5) == 0)
387 root_device_name += 5;
388 }
389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 if (initrd_load())
391 goto out;
392
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700393 /* wait for any asynchronous scanning to complete */
394 if ((ROOT_DEV == 0) && root_wait) {
395 printk(KERN_INFO "Waiting for root device %s...\n",
396 saved_root_name);
397 while (driver_probe_done() != 0 ||
398 (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
399 msleep(100);
400 }
401
402 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 if (is_floppy && rd_doload && rd_load_disk(0))
405 ROOT_DEV = Root_RAM0;
406
407 mount_root();
408out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 sys_mount(".", "/", NULL, MS_MOVE, NULL);
410 sys_chroot(".");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411}
412