1#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>
10#include <linux/mount.h>
11
12#include <linux/nfs_fs.h>
13#include <linux/nfs_fs_sb.h>
14#include <linux/nfs_mount.h>
15
16#include "do_mounts.h"
17
18extern int get_filesystem_list(char * buf);
19
20int __initdata rd_doload;
21
22int root_mountflags = MS_RDONLY | MS_SILENT;
23char * __initdata root_device_name;
24static char __initdata saved_root_name[64];
25
26dev_t ROOT_DEV;
27
28static int __init load_ramdisk(char *str)
29{
30 rd_doload = simple_strtol(str,NULL,0) & 3;
31 return 1;
32}
33__setup("load_ramdisk=", load_ramdisk);
34
35static int __init readonly(char *str)
36{
37 if (*str)
38 return 0;
39 root_mountflags |= MS_RDONLY;
40 return 1;
41}
42
43static int __init readwrite(char *str)
44{
45 if (*str)
46 return 0;
47 root_mountflags &= ~MS_RDONLY;
48 return 1;
49}
50
51__setup("ro", readonly);
52__setup("rw", readwrite);
53
54static dev_t try_name(char *name, int part)
55{
56 char path[64];
57 char buf[32];
58 int range;
59 dev_t res;
60 char *s;
61 int len;
62 int fd;
63 unsigned int maj, min;
64
65
66
67 sprintf(path, "/sys/block/%s/dev", name);
68 fd = sys_open(path, 0, 0);
69 if (fd < 0)
70 goto fail;
71 len = sys_read(fd, buf, 32);
72 sys_close(fd);
73 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
74 goto fail;
75 buf[len - 1] = '\0';
76 if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
77
78
79
80 res = MKDEV(maj, min);
81 if (maj != MAJOR(res) || min != MINOR(res))
82 goto fail;
83 } else {
84
85
86
87 res = new_decode_dev(simple_strtoul(buf, &s, 16));
88 if (*s)
89 goto fail;
90 }
91
92
93 if (!part)
94 return res;
95
96
97 sprintf(path, "/sys/block/%s/range", name);
98 fd = sys_open(path, 0, 0);
99 if (fd < 0)
100 goto fail;
101 len = sys_read(fd, buf, 32);
102 sys_close(fd);
103 if (len <= 0 || len == 32 || buf[len - 1] != '\n')
104 goto fail;
105 buf[len - 1] = '\0';
106 range = simple_strtoul(buf, &s, 10);
107 if (*s)
108 goto fail;
109
110
111 if (part < range)
112 return res + part;
113fail:
114 return 0;
115}
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136dev_t name_to_dev_t(char *name)
137{
138 char s[32];
139 char *p;
140 dev_t res = 0;
141 int part;
142
143#ifdef CONFIG_SYSFS
144 int mkdir_err = sys_mkdir("/sys", 0700);
145 if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0)
146 goto out;
147#endif
148
149 if (strncmp(name, "/dev/", 5) != 0) {
150 unsigned maj, min;
151
152 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
153 res = MKDEV(maj, min);
154 if (maj != MAJOR(res) || min != MINOR(res))
155 goto fail;
156 } else {
157 res = new_decode_dev(simple_strtoul(name, &p, 16));
158 if (*p)
159 goto fail;
160 }
161 goto done;
162 }
163 name += 5;
164 res = Root_NFS;
165 if (strcmp(name, "nfs") == 0)
166 goto done;
167 res = Root_RAM0;
168 if (strcmp(name, "ram") == 0)
169 goto done;
170
171 if (strlen(name) > 31)
172 goto fail;
173 strcpy(s, name);
174 for (p = s; *p; p++)
175 if (*p == '/')
176 *p = '!';
177 res = try_name(s, 0);
178 if (res)
179 goto done;
180
181 while (p > s && isdigit(p[-1]))
182 p--;
183 if (p == s || !*p || *p == '0')
184 goto fail;
185 part = simple_strtoul(p, NULL, 10);
186 *p = '\0';
187 res = try_name(s, part);
188 if (res)
189 goto done;
190
191 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
192 goto fail;
193 p[-1] = '\0';
194 res = try_name(s, part);
195done:
196#ifdef CONFIG_SYSFS
197 sys_umount("/sys", 0);
198out:
199 if (!mkdir_err)
200 sys_rmdir("/sys");
201#endif
202 return res;
203fail:
204 res = 0;
205 goto done;
206}
207
208static int __init root_dev_setup(char *line)
209{
210 strlcpy(saved_root_name, line, sizeof(saved_root_name));
211 return 1;
212}
213
214__setup("root=", root_dev_setup);
215
216static char * __initdata root_mount_data;
217static int __init root_data_setup(char *str)
218{
219 root_mount_data = str;
220 return 1;
221}
222
223static char * __initdata root_fs_names;
224static int __init fs_names_setup(char *str)
225{
226 root_fs_names = str;
227 return 1;
228}
229
230static unsigned int __initdata root_delay;
231static int __init root_delay_setup(char *str)
232{
233 root_delay = simple_strtoul(str, NULL, 0);
234 return 1;
235}
236
237__setup("rootflags=", root_data_setup);
238__setup("rootfstype=", fs_names_setup);
239__setup("rootdelay=", root_delay_setup);
240
241static void __init get_fs_names(char *page)
242{
243 char *s = page;
244
245 if (root_fs_names) {
246 strcpy(page, root_fs_names);
247 while (*s++) {
248 if (s[-1] == ',')
249 s[-1] = '\0';
250 }
251 } else {
252 int len = get_filesystem_list(page);
253 char *p, *next;
254
255 page[len] = '\0';
256 for (p = page-1; p; p = next) {
257 next = strchr(++p, '\n');
258 if (*p++ != '\t')
259 continue;
260 while ((*s++ = *p++) != '\n')
261 ;
262 s[-1] = '\0';
263 }
264 }
265 *s = '\0';
266}
267
268static int __init do_mount_root(char *name, char *fs, int flags, void *data)
269{
270 int err = sys_mount(name, "/root", fs, flags, data);
271 if (err)
272 return err;
273
274 sys_chdir("/root");
275 ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
276 printk("VFS: Mounted root (%s filesystem)%s.\n",
277 current->fs->pwdmnt->mnt_sb->s_type->name,
278 current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
279 " readonly" : "");
280 return 0;
281}
282
283void __init mount_block_root(char *name, int flags)
284{
285 char *fs_names = __getname();
286 char *p;
287 char b[BDEVNAME_SIZE];
288
289 get_fs_names(fs_names);
290retry:
291 for (p = fs_names; *p; p += strlen(p)+1) {
292 int err = do_mount_root(name, p, flags, root_mount_data);
293 switch (err) {
294 case 0:
295 goto out;
296 case -EACCES:
297 flags |= MS_RDONLY;
298 goto retry;
299 case -EINVAL:
300 continue;
301 }
302
303
304
305
306 __bdevname(ROOT_DEV, b);
307 printk("VFS: Cannot open root device \"%s\" or %s\n",
308 root_device_name, b);
309 printk("Please append a correct \"root=\" boot option\n");
310
311 panic("VFS: Unable to mount root fs on %s", b);
312 }
313
314 printk("No filesystem could mount root, tried: ");
315 for (p = fs_names; *p; p += strlen(p)+1)
316 printk(" %s", p);
317 printk("\n");
318 panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b));
319out:
320 putname(fs_names);
321}
322
323#ifdef CONFIG_ROOT_NFS
324static int __init mount_nfs_root(void)
325{
326 void *data = nfs_root_data();
327
328 create_dev("/dev/root", ROOT_DEV);
329 if (data &&
330 do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
331 return 1;
332 return 0;
333}
334#endif
335
336#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
337void __init change_floppy(char *fmt, ...)
338{
339 struct termios termios;
340 char buf[80];
341 char c;
342 int fd;
343 va_list args;
344 va_start(args, fmt);
345 vsprintf(buf, fmt, args);
346 va_end(args);
347 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
348 if (fd >= 0) {
349 sys_ioctl(fd, FDEJECT, 0);
350 sys_close(fd);
351 }
352 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
353 fd = sys_open("/dev/console", O_RDWR, 0);
354 if (fd >= 0) {
355 sys_ioctl(fd, TCGETS, (long)&termios);
356 termios.c_lflag &= ~ICANON;
357 sys_ioctl(fd, TCSETSF, (long)&termios);
358 sys_read(fd, &c, 1);
359 termios.c_lflag |= ICANON;
360 sys_ioctl(fd, TCSETSF, (long)&termios);
361 sys_close(fd);
362 }
363}
364#endif
365
366void __init mount_root(void)
367{
368#ifdef CONFIG_ROOT_NFS
369 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
370 if (mount_nfs_root())
371 return;
372
373 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
374 ROOT_DEV = Root_FD0;
375 }
376#endif
377#ifdef CONFIG_BLK_DEV_FD
378 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
379
380 if (rd_doload==2) {
381 if (rd_load_disk(1)) {
382 ROOT_DEV = Root_RAM1;
383 root_device_name = NULL;
384 }
385 } else
386 change_floppy("root floppy");
387 }
388#endif
389 create_dev("/dev/root", ROOT_DEV);
390 mount_block_root("/dev/root", root_mountflags);
391}
392
393
394
395
396void __init prepare_namespace(void)
397{
398 int is_floppy;
399
400 if (root_delay) {
401 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
402 root_delay);
403 ssleep(root_delay);
404 }
405
406 md_run_setup();
407
408 if (saved_root_name[0]) {
409 root_device_name = saved_root_name;
410 if (!strncmp(root_device_name, "mtd", 3)) {
411 mount_block_root(root_device_name, root_mountflags);
412 goto out;
413 }
414 ROOT_DEV = name_to_dev_t(root_device_name);
415 if (strncmp(root_device_name, "/dev/", 5) == 0)
416 root_device_name += 5;
417 }
418
419 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
420
421 if (initrd_load())
422 goto out;
423
424 if (is_floppy && rd_doload && rd_load_disk(0))
425 ROOT_DEV = Root_RAM0;
426
427 mount_root();
428out:
429 sys_mount(".", "/", NULL, MS_MOVE, NULL);
430 sys_chroot(".");
431 security_sb_post_mountroot();
432}
433
434
