blob: 1161dfd7b0d3d23a4f9968c973a5f578b42c341d [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
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;
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 Sieversedfaa7c2007-05-21 22:08:01 +0200110 res = blk_lookup_devt(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 if (res)
112 goto done;
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114fail:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200115 return 0;
116done:
117 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118}
119
120static int __init root_dev_setup(char *line)
121{
122 strlcpy(saved_root_name, line, sizeof(saved_root_name));
123 return 1;
124}
125
126__setup("root=", root_dev_setup);
127
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700128static int __init rootwait_setup(char *str)
129{
130 if (*str)
131 return 0;
132 root_wait = 1;
133 return 1;
134}
135
136__setup("rootwait", rootwait_setup);
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138static char * __initdata root_mount_data;
139static int __init root_data_setup(char *str)
140{
141 root_mount_data = str;
142 return 1;
143}
144
145static char * __initdata root_fs_names;
146static int __init fs_names_setup(char *str)
147{
148 root_fs_names = str;
149 return 1;
150}
151
152static unsigned int __initdata root_delay;
153static int __init root_delay_setup(char *str)
154{
155 root_delay = simple_strtoul(str, NULL, 0);
156 return 1;
157}
158
159__setup("rootflags=", root_data_setup);
160__setup("rootfstype=", fs_names_setup);
161__setup("rootdelay=", root_delay_setup);
162
163static void __init get_fs_names(char *page)
164{
165 char *s = page;
166
167 if (root_fs_names) {
168 strcpy(page, root_fs_names);
169 while (*s++) {
170 if (s[-1] == ',')
171 s[-1] = '\0';
172 }
173 } else {
174 int len = get_filesystem_list(page);
175 char *p, *next;
176
177 page[len] = '\0';
178 for (p = page-1; p; p = next) {
179 next = strchr(++p, '\n');
180 if (*p++ != '\t')
181 continue;
182 while ((*s++ = *p++) != '\n')
183 ;
184 s[-1] = '\0';
185 }
186 }
187 *s = '\0';
188}
189
190static int __init do_mount_root(char *name, char *fs, int flags, void *data)
191{
192 int err = sys_mount(name, "/root", fs, flags, data);
193 if (err)
194 return err;
195
196 sys_chdir("/root");
197 ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
198 printk("VFS: Mounted root (%s filesystem)%s.\n",
199 current->fs->pwdmnt->mnt_sb->s_type->name,
200 current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
201 " readonly" : "");
202 return 0;
203}
204
205void __init mount_block_root(char *name, int flags)
206{
207 char *fs_names = __getname();
208 char *p;
David Howells93614012006-09-30 20:45:40 +0200209#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 char b[BDEVNAME_SIZE];
David Howells93614012006-09-30 20:45:40 +0200211#else
212 const char *b = name;
213#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215 get_fs_names(fs_names);
216retry:
217 for (p = fs_names; *p; p += strlen(p)+1) {
218 int err = do_mount_root(name, p, flags, root_mount_data);
219 switch (err) {
220 case 0:
221 goto out;
222 case -EACCES:
223 flags |= MS_RDONLY;
224 goto retry;
225 case -EINVAL:
226 continue;
227 }
228 /*
229 * Allow the user to distinguish between failed sys_open
230 * and bad superblock on root device.
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700231 * and give them a list of the available devices
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 */
David Howells93614012006-09-30 20:45:40 +0200233#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 __bdevname(ROOT_DEV, b);
David Howells93614012006-09-30 20:45:40 +0200235#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 printk("VFS: Cannot open root device \"%s\" or %s\n",
237 root_device_name, b);
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700238 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700240 printk_all_partitions();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 panic("VFS: Unable to mount root fs on %s", b);
242 }
Andy Whitcroftbe6e0282006-05-15 09:44:29 -0700243
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700244 printk("List of all partitions:\n");
245 printk_all_partitions();
Andy Whitcroftbe6e0282006-05-15 09:44:29 -0700246 printk("No filesystem could mount root, tried: ");
247 for (p = fs_names; *p; p += strlen(p)+1)
248 printk(" %s", p);
249 printk("\n");
David Howells93614012006-09-30 20:45:40 +0200250#ifdef CONFIG_BLOCK
251 __bdevname(ROOT_DEV, b);
252#endif
253 panic("VFS: Unable to mount root fs on %s", b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254out:
255 putname(fs_names);
256}
257
258#ifdef CONFIG_ROOT_NFS
259static int __init mount_nfs_root(void)
260{
261 void *data = nfs_root_data();
262
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700263 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 if (data &&
265 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
266 return 1;
267 return 0;
268}
269#endif
270
271#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
272void __init change_floppy(char *fmt, ...)
273{
274 struct termios termios;
275 char buf[80];
276 char c;
277 int fd;
278 va_list args;
279 va_start(args, fmt);
280 vsprintf(buf, fmt, args);
281 va_end(args);
282 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
283 if (fd >= 0) {
284 sys_ioctl(fd, FDEJECT, 0);
285 sys_close(fd);
286 }
287 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
288 fd = sys_open("/dev/console", O_RDWR, 0);
289 if (fd >= 0) {
290 sys_ioctl(fd, TCGETS, (long)&termios);
291 termios.c_lflag &= ~ICANON;
292 sys_ioctl(fd, TCSETSF, (long)&termios);
293 sys_read(fd, &c, 1);
294 termios.c_lflag |= ICANON;
295 sys_ioctl(fd, TCSETSF, (long)&termios);
296 sys_close(fd);
297 }
298}
299#endif
300
301void __init mount_root(void)
302{
303#ifdef CONFIG_ROOT_NFS
304 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
305 if (mount_nfs_root())
306 return;
307
308 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
309 ROOT_DEV = Root_FD0;
310 }
311#endif
312#ifdef CONFIG_BLK_DEV_FD
313 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
314 /* rd_doload is 2 for a dual initrd/ramload setup */
315 if (rd_doload==2) {
316 if (rd_load_disk(1)) {
317 ROOT_DEV = Root_RAM1;
318 root_device_name = NULL;
319 }
320 } else
321 change_floppy("root floppy");
322 }
323#endif
David Howells93614012006-09-30 20:45:40 +0200324#ifdef CONFIG_BLOCK
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700325 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 mount_block_root("/dev/root", root_mountflags);
David Howells93614012006-09-30 20:45:40 +0200327#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328}
329
330/*
331 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
332 */
333void __init prepare_namespace(void)
334{
335 int is_floppy;
336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 if (root_delay) {
338 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
339 root_delay);
340 ssleep(root_delay);
341 }
342
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700343 /* wait for the known devices to complete their probing */
344 while (driver_probe_done() != 0)
345 msleep(100);
346
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 md_run_setup();
348
349 if (saved_root_name[0]) {
350 root_device_name = saved_root_name;
Joern Engele9482b42006-05-30 14:25:46 +0200351 if (!strncmp(root_device_name, "mtd", 3)) {
352 mount_block_root(root_device_name, root_mountflags);
353 goto out;
354 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 ROOT_DEV = name_to_dev_t(root_device_name);
356 if (strncmp(root_device_name, "/dev/", 5) == 0)
357 root_device_name += 5;
358 }
359
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 if (initrd_load())
361 goto out;
362
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700363 /* wait for any asynchronous scanning to complete */
364 if ((ROOT_DEV == 0) && root_wait) {
365 printk(KERN_INFO "Waiting for root device %s...\n",
366 saved_root_name);
367 while (driver_probe_done() != 0 ||
368 (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
369 msleep(100);
370 }
371
372 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 if (is_floppy && rd_doload && rd_load_disk(0))
375 ROOT_DEV = Root_RAM0;
376
377 mount_root();
378out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 sys_mount(".", "/", NULL, MS_MOVE, NULL);
380 sys_chroot(".");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382