blob: 660c1e50c91b7a622b2e65bf1095cd4e982b58af [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16#include <linux/nfs_fs.h>
17#include <linux/nfs_fs_sb.h>
18#include <linux/nfs_mount.h>
19
20#include "do_mounts.h"
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
23
Theodore Ts'o9b04c992006-03-24 03:15:10 -080024int root_mountflags = MS_RDONLY | MS_SILENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070025char * __initdata root_device_name;
26static char __initdata saved_root_name[64];
Pierre Ossmancc1ed752007-07-15 23:40:35 -070027static int __initdata root_wait;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070057/*
58 * Convert a name into device number. We accept the following variants:
59 *
60 * 1) device number in hexadecimal represents itself
61 * 2) /dev/nfs represents Root_NFS (0xff)
62 * 3) /dev/<disk_name> represents the device number of disk
63 * 4) /dev/<disk_name><decimal> represents the device number
64 * of partition - device number of disk plus the partition number
65 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
66 * used when disk name of partitioned disk ends on a digit.
67 *
Kay Sieversedfaa7c2007-05-21 22:08:01 +020068 * If name doesn't have fall into the categories above, we return (0,0).
69 * block_class is used to check if something is a disk name. If the disk
70 * name contains slashes, the device name has them replaced with
71 * bangs.
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 */
73
74dev_t name_to_dev_t(char *name)
75{
76 char s[32];
77 char *p;
78 dev_t res = 0;
Kay Sievers30f2f0e2008-05-06 22:31:33 +020079 int part;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81 if (strncmp(name, "/dev/", 5) != 0) {
82 unsigned maj, min;
83
84 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
85 res = MKDEV(maj, min);
86 if (maj != MAJOR(res) || min != MINOR(res))
87 goto fail;
88 } else {
89 res = new_decode_dev(simple_strtoul(name, &p, 16));
90 if (*p)
91 goto fail;
92 }
93 goto done;
94 }
Kay Sieversedfaa7c2007-05-21 22:08:01 +020095
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 name += 5;
97 res = Root_NFS;
98 if (strcmp(name, "nfs") == 0)
99 goto done;
100 res = Root_RAM0;
101 if (strcmp(name, "ram") == 0)
102 goto done;
103
104 if (strlen(name) > 31)
105 goto fail;
106 strcpy(s, name);
107 for (p = s; *p; p++)
108 if (*p == '/')
109 *p = '!';
Kay Sievers30f2f0e2008-05-06 22:31:33 +0200110 res = blk_lookup_devt(s, 0);
111 if (res)
112 goto done;
113
114 /*
115 * try non-existant, but valid partition, which may only exist
116 * after revalidating the disk, like partitioned md devices
117 */
118 while (p > s && isdigit(p[-1]))
119 p--;
120 if (p == s || !*p || *p == '0')
121 goto fail;
122
123 /* try disk name without <part number> */
124 part = simple_strtoul(p, NULL, 10);
125 *p = '\0';
126 res = blk_lookup_devt(s, part);
127 if (res)
128 goto done;
129
130 /* try disk name without p<part number> */
131 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
132 goto fail;
133 p[-1] = '\0';
134 res = blk_lookup_devt(s, part);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 if (res)
136 goto done;
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138fail:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200139 return 0;
140done:
141 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142}
143
144static int __init root_dev_setup(char *line)
145{
146 strlcpy(saved_root_name, line, sizeof(saved_root_name));
147 return 1;
148}
149
150__setup("root=", root_dev_setup);
151
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700152static int __init rootwait_setup(char *str)
153{
154 if (*str)
155 return 0;
156 root_wait = 1;
157 return 1;
158}
159
160__setup("rootwait", rootwait_setup);
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162static char * __initdata root_mount_data;
163static int __init root_data_setup(char *str)
164{
165 root_mount_data = str;
166 return 1;
167}
168
169static char * __initdata root_fs_names;
170static int __init fs_names_setup(char *str)
171{
172 root_fs_names = str;
173 return 1;
174}
175
176static unsigned int __initdata root_delay;
177static int __init root_delay_setup(char *str)
178{
179 root_delay = simple_strtoul(str, NULL, 0);
180 return 1;
181}
182
183__setup("rootflags=", root_data_setup);
184__setup("rootfstype=", fs_names_setup);
185__setup("rootdelay=", root_delay_setup);
186
187static void __init get_fs_names(char *page)
188{
189 char *s = page;
190
191 if (root_fs_names) {
192 strcpy(page, root_fs_names);
193 while (*s++) {
194 if (s[-1] == ',')
195 s[-1] = '\0';
196 }
197 } else {
198 int len = get_filesystem_list(page);
199 char *p, *next;
200
201 page[len] = '\0';
202 for (p = page-1; p; p = next) {
203 next = strchr(++p, '\n');
204 if (*p++ != '\t')
205 continue;
206 while ((*s++ = *p++) != '\n')
207 ;
208 s[-1] = '\0';
209 }
210 }
211 *s = '\0';
212}
213
214static int __init do_mount_root(char *name, char *fs, int flags, void *data)
215{
216 int err = sys_mount(name, "/root", fs, flags, data);
217 if (err)
218 return err;
219
220 sys_chdir("/root");
Jan Blunck6ac08c32008-02-14 19:34:38 -0800221 ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 printk("VFS: Mounted root (%s filesystem)%s.\n",
Jan Blunck6ac08c32008-02-14 19:34:38 -0800223 current->fs->pwd.mnt->mnt_sb->s_type->name,
224 current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 " readonly" : "");
226 return 0;
227}
228
229void __init mount_block_root(char *name, int flags)
230{
231 char *fs_names = __getname();
232 char *p;
David Howells93614012006-09-30 20:45:40 +0200233#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 char b[BDEVNAME_SIZE];
David Howells93614012006-09-30 20:45:40 +0200235#else
236 const char *b = name;
237#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 get_fs_names(fs_names);
240retry:
241 for (p = fs_names; *p; p += strlen(p)+1) {
242 int err = do_mount_root(name, p, flags, root_mount_data);
243 switch (err) {
244 case 0:
245 goto out;
246 case -EACCES:
247 flags |= MS_RDONLY;
248 goto retry;
249 case -EINVAL:
250 continue;
251 }
252 /*
253 * Allow the user to distinguish between failed sys_open
254 * and bad superblock on root device.
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700255 * and give them a list of the available devices
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 */
David Howells93614012006-09-30 20:45:40 +0200257#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 __bdevname(ROOT_DEV, b);
David Howells93614012006-09-30 20:45:40 +0200259#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 printk("VFS: Cannot open root device \"%s\" or %s\n",
261 root_device_name, b);
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700262 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700264 printk_all_partitions();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 panic("VFS: Unable to mount root fs on %s", b);
266 }
Andy Whitcroftbe6e028b2006-05-15 09:44:29 -0700267
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700268 printk("List of all partitions:\n");
269 printk_all_partitions();
Andy Whitcroftbe6e028b2006-05-15 09:44:29 -0700270 printk("No filesystem could mount root, tried: ");
271 for (p = fs_names; *p; p += strlen(p)+1)
272 printk(" %s", p);
273 printk("\n");
David Howells93614012006-09-30 20:45:40 +0200274#ifdef CONFIG_BLOCK
275 __bdevname(ROOT_DEV, b);
276#endif
277 panic("VFS: Unable to mount root fs on %s", b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278out:
279 putname(fs_names);
280}
281
282#ifdef CONFIG_ROOT_NFS
283static int __init mount_nfs_root(void)
284{
285 void *data = nfs_root_data();
286
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700287 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 if (data &&
289 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
290 return 1;
291 return 0;
292}
293#endif
294
295#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
296void __init change_floppy(char *fmt, ...)
297{
298 struct termios termios;
299 char buf[80];
300 char c;
301 int fd;
302 va_list args;
303 va_start(args, fmt);
304 vsprintf(buf, fmt, args);
305 va_end(args);
306 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
307 if (fd >= 0) {
308 sys_ioctl(fd, FDEJECT, 0);
309 sys_close(fd);
310 }
311 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
312 fd = sys_open("/dev/console", O_RDWR, 0);
313 if (fd >= 0) {
314 sys_ioctl(fd, TCGETS, (long)&termios);
315 termios.c_lflag &= ~ICANON;
316 sys_ioctl(fd, TCSETSF, (long)&termios);
317 sys_read(fd, &c, 1);
318 termios.c_lflag |= ICANON;
319 sys_ioctl(fd, TCSETSF, (long)&termios);
320 sys_close(fd);
321 }
322}
323#endif
324
325void __init mount_root(void)
326{
327#ifdef CONFIG_ROOT_NFS
328 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
329 if (mount_nfs_root())
330 return;
331
332 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
333 ROOT_DEV = Root_FD0;
334 }
335#endif
336#ifdef CONFIG_BLK_DEV_FD
337 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
338 /* rd_doload is 2 for a dual initrd/ramload setup */
339 if (rd_doload==2) {
340 if (rd_load_disk(1)) {
341 ROOT_DEV = Root_RAM1;
342 root_device_name = NULL;
343 }
344 } else
345 change_floppy("root floppy");
346 }
347#endif
David Howells93614012006-09-30 20:45:40 +0200348#ifdef CONFIG_BLOCK
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700349 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 mount_block_root("/dev/root", root_mountflags);
David Howells93614012006-09-30 20:45:40 +0200351#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
354/*
355 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
356 */
357void __init prepare_namespace(void)
358{
359 int is_floppy;
360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 if (root_delay) {
362 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
363 root_delay);
364 ssleep(root_delay);
365 }
366
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700367 /* wait for the known devices to complete their probing */
368 while (driver_probe_done() != 0)
369 msleep(100);
370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 md_run_setup();
372
373 if (saved_root_name[0]) {
374 root_device_name = saved_root_name;
Joern Engele9482b42006-05-30 14:25:46 +0200375 if (!strncmp(root_device_name, "mtd", 3)) {
376 mount_block_root(root_device_name, root_mountflags);
377 goto out;
378 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 ROOT_DEV = name_to_dev_t(root_device_name);
380 if (strncmp(root_device_name, "/dev/", 5) == 0)
381 root_device_name += 5;
382 }
383
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 if (initrd_load())
385 goto out;
386
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700387 /* wait for any asynchronous scanning to complete */
388 if ((ROOT_DEV == 0) && root_wait) {
389 printk(KERN_INFO "Waiting for root device %s...\n",
390 saved_root_name);
391 while (driver_probe_done() != 0 ||
392 (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
393 msleep(100);
394 }
395
396 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
397
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 if (is_floppy && rd_doload && rd_load_disk(0))
399 ROOT_DEV = Root_RAM0;
400
401 mount_root();
402out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 sys_mount(".", "/", NULL, MS_MOVE, NULL);
404 sys_chroot(".");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405}
406