]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
dd2a345f | 10 | #include <linux/genhd.h> |
d53d9f16 | 11 | #include <linux/mount.h> |
d779249e | 12 | #include <linux/device.h> |
46595390 | 13 | #include <linux/init.h> |
1da177e4 LT |
14 | |
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 | ||
21 | extern int get_filesystem_list(char * buf); | |
22 | ||
23 | int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ | |
24 | ||
9b04c997 | 25 | int root_mountflags = MS_RDONLY | MS_SILENT; |
1da177e4 LT |
26 | char * __initdata root_device_name; |
27 | static char __initdata saved_root_name[64]; | |
cc1ed754 | 28 | static int __initdata root_wait; |
1da177e4 | 29 | |
1da177e4 LT |
30 | dev_t ROOT_DEV; |
31 | ||
1da177e4 LT |
32 | static 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 | ||
39 | static int __init readonly(char *str) | |
40 | { | |
41 | if (*str) | |
42 | return 0; | |
43 | root_mountflags |= MS_RDONLY; | |
44 | return 1; | |
45 | } | |
46 | ||
47 | static 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 | ||
58 | static dev_t try_name(char *name, int part) | |
59 | { | |
60 | char path[64]; | |
61 | char buf[32]; | |
62 | int range; | |
63 | dev_t res; | |
64 | char *s; | |
65 | int len; | |
66 | int fd; | |
67 | unsigned int maj, min; | |
68 | ||
69 | /* read device number from .../dev */ | |
70 | ||
71 | sprintf(path, "/sys/block/%s/dev", name); | |
72 | fd = sys_open(path, 0, 0); | |
73 | if (fd < 0) | |
74 | goto fail; | |
75 | len = sys_read(fd, buf, 32); | |
76 | sys_close(fd); | |
77 | if (len <= 0 || len == 32 || buf[len - 1] != '\n') | |
78 | goto fail; | |
79 | buf[len - 1] = '\0'; | |
80 | if (sscanf(buf, "%u:%u", &maj, &min) == 2) { | |
81 | /* | |
82 | * Try the %u:%u format -- see print_dev_t() | |
83 | */ | |
84 | res = MKDEV(maj, min); | |
85 | if (maj != MAJOR(res) || min != MINOR(res)) | |
86 | goto fail; | |
87 | } else { | |
88 | /* | |
89 | * Nope. Try old-style "0321" | |
90 | */ | |
91 | res = new_decode_dev(simple_strtoul(buf, &s, 16)); | |
92 | if (*s) | |
93 | goto fail; | |
94 | } | |
95 | ||
96 | /* if it's there and we are not looking for a partition - that's it */ | |
97 | if (!part) | |
98 | return res; | |
99 | ||
100 | /* otherwise read range from .../range */ | |
101 | sprintf(path, "/sys/block/%s/range", name); | |
102 | fd = sys_open(path, 0, 0); | |
103 | if (fd < 0) | |
104 | goto fail; | |
105 | len = sys_read(fd, buf, 32); | |
106 | sys_close(fd); | |
107 | if (len <= 0 || len == 32 || buf[len - 1] != '\n') | |
108 | goto fail; | |
109 | buf[len - 1] = '\0'; | |
110 | range = simple_strtoul(buf, &s, 10); | |
111 | if (*s) | |
112 | goto fail; | |
113 | ||
114 | /* if partition is within range - we got it */ | |
115 | if (part < range) | |
116 | return res + part; | |
117 | fail: | |
118 | return 0; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Convert a name into device number. We accept the following variants: | |
123 | * | |
124 | * 1) device number in hexadecimal represents itself | |
125 | * 2) /dev/nfs represents Root_NFS (0xff) | |
126 | * 3) /dev/<disk_name> represents the device number of disk | |
127 | * 4) /dev/<disk_name><decimal> represents the device number | |
128 | * of partition - device number of disk plus the partition number | |
129 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is | |
130 | * used when disk name of partitioned disk ends on a digit. | |
131 | * | |
132 | * If name doesn't have fall into the categories above, we return 0. | |
13ae6d81 | 133 | * Sysfs is used to check if something is a disk name - it has |
1da177e4 | 134 | * all known disks under bus/block/devices. If the disk name |
13ae6d81 REB |
135 | * contains slashes, name of sysfs node has them replaced with |
136 | * bangs. try_name() does the actual checks, assuming that sysfs | |
1da177e4 LT |
137 | * is mounted on rootfs /sys. |
138 | */ | |
139 | ||
140 | dev_t name_to_dev_t(char *name) | |
141 | { | |
142 | char s[32]; | |
143 | char *p; | |
144 | dev_t res = 0; | |
145 | int part; | |
146 | ||
147 | #ifdef CONFIG_SYSFS | |
148 | int mkdir_err = sys_mkdir("/sys", 0700); | |
149 | if (sys_mount("sysfs", "/sys", "sysfs", 0, NULL) < 0) | |
150 | goto out; | |
151 | #endif | |
152 | ||
153 | if (strncmp(name, "/dev/", 5) != 0) { | |
154 | unsigned maj, min; | |
155 | ||
156 | if (sscanf(name, "%u:%u", &maj, &min) == 2) { | |
157 | res = MKDEV(maj, min); | |
158 | if (maj != MAJOR(res) || min != MINOR(res)) | |
159 | goto fail; | |
160 | } else { | |
161 | res = new_decode_dev(simple_strtoul(name, &p, 16)); | |
162 | if (*p) | |
163 | goto fail; | |
164 | } | |
165 | goto done; | |
166 | } | |
167 | name += 5; | |
168 | res = Root_NFS; | |
169 | if (strcmp(name, "nfs") == 0) | |
170 | goto done; | |
171 | res = Root_RAM0; | |
172 | if (strcmp(name, "ram") == 0) | |
173 | goto done; | |
174 | ||
175 | if (strlen(name) > 31) | |
176 | goto fail; | |
177 | strcpy(s, name); | |
178 | for (p = s; *p; p++) | |
179 | if (*p == '/') | |
180 | *p = '!'; | |
181 | res = try_name(s, 0); | |
182 | if (res) | |
183 | goto done; | |
184 | ||
185 | while (p > s && isdigit(p[-1])) | |
186 | p--; | |
187 | if (p == s || !*p || *p == '0') | |
188 | goto fail; | |
189 | part = simple_strtoul(p, NULL, 10); | |
190 | *p = '\0'; | |
191 | res = try_name(s, part); | |
192 | if (res) | |
193 | goto done; | |
194 | ||
195 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') | |
196 | goto fail; | |
197 | p[-1] = '\0'; | |
198 | res = try_name(s, part); | |
199 | done: | |
200 | #ifdef CONFIG_SYSFS | |
201 | sys_umount("/sys", 0); | |
202 | out: | |
203 | if (!mkdir_err) | |
204 | sys_rmdir("/sys"); | |
205 | #endif | |
206 | return res; | |
207 | fail: | |
208 | res = 0; | |
209 | goto done; | |
210 | } | |
211 | ||
212 | static int __init root_dev_setup(char *line) | |
213 | { | |
214 | strlcpy(saved_root_name, line, sizeof(saved_root_name)); | |
215 | return 1; | |
216 | } | |
217 | ||
218 | __setup("root=", root_dev_setup); | |
219 | ||
cc1ed754 PO |
220 | static int __init rootwait_setup(char *str) |
221 | { | |
222 | if (*str) | |
223 | return 0; | |
224 | root_wait = 1; | |
225 | return 1; | |
226 | } | |
227 | ||
228 | __setup("rootwait", rootwait_setup); | |
229 | ||
1da177e4 LT |
230 | static char * __initdata root_mount_data; |
231 | static int __init root_data_setup(char *str) | |
232 | { | |
233 | root_mount_data = str; | |
234 | return 1; | |
235 | } | |
236 | ||
237 | static char * __initdata root_fs_names; | |
238 | static int __init fs_names_setup(char *str) | |
239 | { | |
240 | root_fs_names = str; | |
241 | return 1; | |
242 | } | |
243 | ||
244 | static unsigned int __initdata root_delay; | |
245 | static int __init root_delay_setup(char *str) | |
246 | { | |
247 | root_delay = simple_strtoul(str, NULL, 0); | |
248 | return 1; | |
249 | } | |
250 | ||
251 | __setup("rootflags=", root_data_setup); | |
252 | __setup("rootfstype=", fs_names_setup); | |
253 | __setup("rootdelay=", root_delay_setup); | |
254 | ||
255 | static void __init get_fs_names(char *page) | |
256 | { | |
257 | char *s = page; | |
258 | ||
259 | if (root_fs_names) { | |
260 | strcpy(page, root_fs_names); | |
261 | while (*s++) { | |
262 | if (s[-1] == ',') | |
263 | s[-1] = '\0'; | |
264 | } | |
265 | } else { | |
266 | int len = get_filesystem_list(page); | |
267 | char *p, *next; | |
268 | ||
269 | page[len] = '\0'; | |
270 | for (p = page-1; p; p = next) { | |
271 | next = strchr(++p, '\n'); | |
272 | if (*p++ != '\t') | |
273 | continue; | |
274 | while ((*s++ = *p++) != '\n') | |
275 | ; | |
276 | s[-1] = '\0'; | |
277 | } | |
278 | } | |
279 | *s = '\0'; | |
280 | } | |
281 | ||
282 | static int __init do_mount_root(char *name, char *fs, int flags, void *data) | |
283 | { | |
284 | int err = sys_mount(name, "/root", fs, flags, data); | |
285 | if (err) | |
286 | return err; | |
287 | ||
288 | sys_chdir("/root"); | |
289 | ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev; | |
290 | printk("VFS: Mounted root (%s filesystem)%s.\n", | |
291 | current->fs->pwdmnt->mnt_sb->s_type->name, | |
292 | current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ? | |
293 | " readonly" : ""); | |
294 | return 0; | |
295 | } | |
296 | ||
297 | void __init mount_block_root(char *name, int flags) | |
298 | { | |
299 | char *fs_names = __getname(); | |
300 | char *p; | |
9361401e | 301 | #ifdef CONFIG_BLOCK |
1da177e4 | 302 | char b[BDEVNAME_SIZE]; |
9361401e DH |
303 | #else |
304 | const char *b = name; | |
305 | #endif | |
1da177e4 LT |
306 | |
307 | get_fs_names(fs_names); | |
308 | retry: | |
309 | for (p = fs_names; *p; p += strlen(p)+1) { | |
310 | int err = do_mount_root(name, p, flags, root_mount_data); | |
311 | switch (err) { | |
312 | case 0: | |
313 | goto out; | |
314 | case -EACCES: | |
315 | flags |= MS_RDONLY; | |
316 | goto retry; | |
317 | case -EINVAL: | |
318 | continue; | |
319 | } | |
320 | /* | |
321 | * Allow the user to distinguish between failed sys_open | |
322 | * and bad superblock on root device. | |
dd2a345f | 323 | * and give them a list of the available devices |
1da177e4 | 324 | */ |
9361401e | 325 | #ifdef CONFIG_BLOCK |
1da177e4 | 326 | __bdevname(ROOT_DEV, b); |
9361401e | 327 | #endif |
1da177e4 LT |
328 | printk("VFS: Cannot open root device \"%s\" or %s\n", |
329 | root_device_name, b); | |
dd2a345f | 330 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
1da177e4 | 331 | |
dd2a345f | 332 | printk_all_partitions(); |
1da177e4 LT |
333 | panic("VFS: Unable to mount root fs on %s", b); |
334 | } | |
be6e028b | 335 | |
dd2a345f DG |
336 | printk("List of all partitions:\n"); |
337 | printk_all_partitions(); | |
be6e028b AW |
338 | printk("No filesystem could mount root, tried: "); |
339 | for (p = fs_names; *p; p += strlen(p)+1) | |
340 | printk(" %s", p); | |
341 | printk("\n"); | |
9361401e DH |
342 | #ifdef CONFIG_BLOCK |
343 | __bdevname(ROOT_DEV, b); | |
344 | #endif | |
345 | panic("VFS: Unable to mount root fs on %s", b); | |
1da177e4 LT |
346 | out: |
347 | putname(fs_names); | |
348 | } | |
349 | ||
350 | #ifdef CONFIG_ROOT_NFS | |
351 | static int __init mount_nfs_root(void) | |
352 | { | |
353 | void *data = nfs_root_data(); | |
354 | ||
bdaf8529 | 355 | create_dev("/dev/root", ROOT_DEV); |
1da177e4 LT |
356 | if (data && |
357 | do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0) | |
358 | return 1; | |
359 | return 0; | |
360 | } | |
361 | #endif | |
362 | ||
363 | #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) | |
364 | void __init change_floppy(char *fmt, ...) | |
365 | { | |
366 | struct termios termios; | |
367 | char buf[80]; | |
368 | char c; | |
369 | int fd; | |
370 | va_list args; | |
371 | va_start(args, fmt); | |
372 | vsprintf(buf, fmt, args); | |
373 | va_end(args); | |
374 | fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); | |
375 | if (fd >= 0) { | |
376 | sys_ioctl(fd, FDEJECT, 0); | |
377 | sys_close(fd); | |
378 | } | |
379 | printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); | |
380 | fd = sys_open("/dev/console", O_RDWR, 0); | |
381 | if (fd >= 0) { | |
382 | sys_ioctl(fd, TCGETS, (long)&termios); | |
383 | termios.c_lflag &= ~ICANON; | |
384 | sys_ioctl(fd, TCSETSF, (long)&termios); | |
385 | sys_read(fd, &c, 1); | |
386 | termios.c_lflag |= ICANON; | |
387 | sys_ioctl(fd, TCSETSF, (long)&termios); | |
388 | sys_close(fd); | |
389 | } | |
390 | } | |
391 | #endif | |
392 | ||
393 | void __init mount_root(void) | |
394 | { | |
395 | #ifdef CONFIG_ROOT_NFS | |
396 | if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) { | |
397 | if (mount_nfs_root()) | |
398 | return; | |
399 | ||
400 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); | |
401 | ROOT_DEV = Root_FD0; | |
402 | } | |
403 | #endif | |
404 | #ifdef CONFIG_BLK_DEV_FD | |
405 | if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { | |
406 | /* rd_doload is 2 for a dual initrd/ramload setup */ | |
407 | if (rd_doload==2) { | |
408 | if (rd_load_disk(1)) { | |
409 | ROOT_DEV = Root_RAM1; | |
410 | root_device_name = NULL; | |
411 | } | |
412 | } else | |
413 | change_floppy("root floppy"); | |
414 | } | |
415 | #endif | |
9361401e | 416 | #ifdef CONFIG_BLOCK |
bdaf8529 | 417 | create_dev("/dev/root", ROOT_DEV); |
1da177e4 | 418 | mount_block_root("/dev/root", root_mountflags); |
9361401e | 419 | #endif |
1da177e4 LT |
420 | } |
421 | ||
422 | /* | |
423 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. | |
424 | */ | |
425 | void __init prepare_namespace(void) | |
426 | { | |
427 | int is_floppy; | |
428 | ||
1da177e4 LT |
429 | if (root_delay) { |
430 | printk(KERN_INFO "Waiting %dsec before mounting root device...\n", | |
431 | root_delay); | |
432 | ssleep(root_delay); | |
433 | } | |
434 | ||
d779249e GKH |
435 | /* wait for the known devices to complete their probing */ |
436 | while (driver_probe_done() != 0) | |
437 | msleep(100); | |
438 | ||
1da177e4 LT |
439 | md_run_setup(); |
440 | ||
441 | if (saved_root_name[0]) { | |
442 | root_device_name = saved_root_name; | |
e9482b43 JE |
443 | if (!strncmp(root_device_name, "mtd", 3)) { |
444 | mount_block_root(root_device_name, root_mountflags); | |
445 | goto out; | |
446 | } | |
1da177e4 LT |
447 | ROOT_DEV = name_to_dev_t(root_device_name); |
448 | if (strncmp(root_device_name, "/dev/", 5) == 0) | |
449 | root_device_name += 5; | |
450 | } | |
451 | ||
1da177e4 LT |
452 | if (initrd_load()) |
453 | goto out; | |
454 | ||
cc1ed754 PO |
455 | /* wait for any asynchronous scanning to complete */ |
456 | if ((ROOT_DEV == 0) && root_wait) { | |
457 | printk(KERN_INFO "Waiting for root device %s...\n", | |
458 | saved_root_name); | |
459 | while (driver_probe_done() != 0 || | |
460 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) | |
461 | msleep(100); | |
462 | } | |
463 | ||
464 | is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; | |
465 | ||
1da177e4 LT |
466 | if (is_floppy && rd_doload && rd_load_disk(0)) |
467 | ROOT_DEV = Root_RAM0; | |
468 | ||
469 | mount_root(); | |
470 | out: | |
1da177e4 LT |
471 | sys_mount(".", "/", NULL, MS_MOVE, NULL); |
472 | sys_chroot("."); | |
473 | security_sb_post_mountroot(); | |
1da177e4 LT |
474 | } |
475 |