Commit | Line | Data |
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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> |
011e3fcd | 14 | #include <linux/fs.h> |
82c8253a | 15 | #include <linux/initrd.h> |
22a9d645 | 16 | #include <linux/async.h> |
1da177e4 LT |
17 | |
18 | #include <linux/nfs_fs.h> | |
19 | #include <linux/nfs_fs_sb.h> | |
20 | #include <linux/nfs_mount.h> | |
21 | ||
22 | #include "do_mounts.h" | |
23 | ||
1da177e4 LT |
24 | int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ |
25 | ||
9b04c997 | 26 | int root_mountflags = MS_RDONLY | MS_SILENT; |
f56f6d30 | 27 | static char * __initdata root_device_name; |
1da177e4 | 28 | static char __initdata saved_root_name[64]; |
cc1ed754 | 29 | static int __initdata root_wait; |
1da177e4 | 30 | |
1da177e4 LT |
31 | dev_t ROOT_DEV; |
32 | ||
1da177e4 LT |
33 | static int __init load_ramdisk(char *str) |
34 | { | |
35 | rd_doload = simple_strtol(str,NULL,0) & 3; | |
36 | return 1; | |
37 | } | |
38 | __setup("load_ramdisk=", load_ramdisk); | |
39 | ||
40 | static int __init readonly(char *str) | |
41 | { | |
42 | if (*str) | |
43 | return 0; | |
44 | root_mountflags |= MS_RDONLY; | |
45 | return 1; | |
46 | } | |
47 | ||
48 | static int __init readwrite(char *str) | |
49 | { | |
50 | if (*str) | |
51 | return 0; | |
52 | root_mountflags &= ~MS_RDONLY; | |
53 | return 1; | |
54 | } | |
55 | ||
56 | __setup("ro", readonly); | |
57 | __setup("rw", readwrite); | |
58 | ||
1da177e4 LT |
59 | /* |
60 | * Convert a name into device number. We accept the following variants: | |
61 | * | |
62 | * 1) device number in hexadecimal represents itself | |
63 | * 2) /dev/nfs represents Root_NFS (0xff) | |
64 | * 3) /dev/<disk_name> represents the device number of disk | |
65 | * 4) /dev/<disk_name><decimal> represents the device number | |
66 | * of partition - device number of disk plus the partition number | |
67 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is | |
68 | * used when disk name of partitioned disk ends on a digit. | |
69 | * | |
edfaa7c3 KS |
70 | * If name doesn't have fall into the categories above, we return (0,0). |
71 | * block_class is used to check if something is a disk name. If the disk | |
72 | * name contains slashes, the device name has them replaced with | |
73 | * bangs. | |
1da177e4 LT |
74 | */ |
75 | ||
76 | dev_t name_to_dev_t(char *name) | |
77 | { | |
78 | char s[32]; | |
79 | char *p; | |
80 | dev_t res = 0; | |
30f2f0eb | 81 | int part; |
1da177e4 LT |
82 | |
83 | if (strncmp(name, "/dev/", 5) != 0) { | |
84 | unsigned maj, min; | |
85 | ||
86 | if (sscanf(name, "%u:%u", &maj, &min) == 2) { | |
87 | res = MKDEV(maj, min); | |
88 | if (maj != MAJOR(res) || min != MINOR(res)) | |
89 | goto fail; | |
90 | } else { | |
91 | res = new_decode_dev(simple_strtoul(name, &p, 16)); | |
92 | if (*p) | |
93 | goto fail; | |
94 | } | |
95 | goto done; | |
96 | } | |
edfaa7c3 | 97 | |
1da177e4 LT |
98 | name += 5; |
99 | res = Root_NFS; | |
100 | if (strcmp(name, "nfs") == 0) | |
101 | goto done; | |
102 | res = Root_RAM0; | |
103 | if (strcmp(name, "ram") == 0) | |
104 | goto done; | |
105 | ||
106 | if (strlen(name) > 31) | |
107 | goto fail; | |
108 | strcpy(s, name); | |
109 | for (p = s; *p; p++) | |
110 | if (*p == '/') | |
111 | *p = '!'; | |
30f2f0eb KS |
112 | res = blk_lookup_devt(s, 0); |
113 | if (res) | |
114 | goto done; | |
115 | ||
116 | /* | |
117 | * try non-existant, but valid partition, which may only exist | |
118 | * after revalidating the disk, like partitioned md devices | |
119 | */ | |
120 | while (p > s && isdigit(p[-1])) | |
121 | p--; | |
122 | if (p == s || !*p || *p == '0') | |
123 | goto fail; | |
124 | ||
125 | /* try disk name without <part number> */ | |
126 | part = simple_strtoul(p, NULL, 10); | |
127 | *p = '\0'; | |
128 | res = blk_lookup_devt(s, part); | |
129 | if (res) | |
130 | goto done; | |
131 | ||
132 | /* try disk name without p<part number> */ | |
133 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') | |
134 | goto fail; | |
135 | p[-1] = '\0'; | |
136 | res = blk_lookup_devt(s, part); | |
1da177e4 LT |
137 | if (res) |
138 | goto done; | |
139 | ||
edfaa7c3 KS |
140 | fail: |
141 | return 0; | |
1da177e4 | 142 | done: |
1da177e4 | 143 | return res; |
1da177e4 LT |
144 | } |
145 | ||
146 | static int __init root_dev_setup(char *line) | |
147 | { | |
148 | strlcpy(saved_root_name, line, sizeof(saved_root_name)); | |
149 | return 1; | |
150 | } | |
151 | ||
152 | __setup("root=", root_dev_setup); | |
153 | ||
cc1ed754 PO |
154 | static int __init rootwait_setup(char *str) |
155 | { | |
156 | if (*str) | |
157 | return 0; | |
158 | root_wait = 1; | |
159 | return 1; | |
160 | } | |
161 | ||
162 | __setup("rootwait", rootwait_setup); | |
163 | ||
1da177e4 LT |
164 | static char * __initdata root_mount_data; |
165 | static int __init root_data_setup(char *str) | |
166 | { | |
167 | root_mount_data = str; | |
168 | return 1; | |
169 | } | |
170 | ||
171 | static char * __initdata root_fs_names; | |
172 | static int __init fs_names_setup(char *str) | |
173 | { | |
174 | root_fs_names = str; | |
175 | return 1; | |
176 | } | |
177 | ||
178 | static unsigned int __initdata root_delay; | |
179 | static int __init root_delay_setup(char *str) | |
180 | { | |
181 | root_delay = simple_strtoul(str, NULL, 0); | |
182 | return 1; | |
183 | } | |
184 | ||
185 | __setup("rootflags=", root_data_setup); | |
186 | __setup("rootfstype=", fs_names_setup); | |
187 | __setup("rootdelay=", root_delay_setup); | |
188 | ||
189 | static void __init get_fs_names(char *page) | |
190 | { | |
191 | char *s = page; | |
192 | ||
193 | if (root_fs_names) { | |
194 | strcpy(page, root_fs_names); | |
195 | while (*s++) { | |
196 | if (s[-1] == ',') | |
197 | s[-1] = '\0'; | |
198 | } | |
199 | } else { | |
200 | int len = get_filesystem_list(page); | |
201 | char *p, *next; | |
202 | ||
203 | page[len] = '\0'; | |
204 | for (p = page-1; p; p = next) { | |
205 | next = strchr(++p, '\n'); | |
206 | if (*p++ != '\t') | |
207 | continue; | |
208 | while ((*s++ = *p++) != '\n') | |
209 | ; | |
210 | s[-1] = '\0'; | |
211 | } | |
212 | } | |
213 | *s = '\0'; | |
214 | } | |
215 | ||
216 | static int __init do_mount_root(char *name, char *fs, int flags, void *data) | |
217 | { | |
218 | int err = sys_mount(name, "/root", fs, flags, data); | |
219 | if (err) | |
220 | return err; | |
221 | ||
222 | sys_chdir("/root"); | |
6ac08c39 | 223 | ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev; |
bca1033b | 224 | printk("VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", |
6ac08c39 JB |
225 | current->fs->pwd.mnt->mnt_sb->s_type->name, |
226 | current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ? | |
bca1033b | 227 | " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
1da177e4 LT |
228 | return 0; |
229 | } | |
230 | ||
231 | void __init mount_block_root(char *name, int flags) | |
232 | { | |
233 | char *fs_names = __getname(); | |
234 | char *p; | |
9361401e | 235 | #ifdef CONFIG_BLOCK |
1da177e4 | 236 | char b[BDEVNAME_SIZE]; |
9361401e DH |
237 | #else |
238 | const char *b = name; | |
239 | #endif | |
1da177e4 LT |
240 | |
241 | get_fs_names(fs_names); | |
242 | retry: | |
243 | for (p = fs_names; *p; p += strlen(p)+1) { | |
244 | int err = do_mount_root(name, p, flags, root_mount_data); | |
245 | switch (err) { | |
246 | case 0: | |
247 | goto out; | |
248 | case -EACCES: | |
249 | flags |= MS_RDONLY; | |
250 | goto retry; | |
251 | case -EINVAL: | |
252 | continue; | |
253 | } | |
254 | /* | |
255 | * Allow the user to distinguish between failed sys_open | |
256 | * and bad superblock on root device. | |
dd2a345f | 257 | * and give them a list of the available devices |
1da177e4 | 258 | */ |
9361401e | 259 | #ifdef CONFIG_BLOCK |
1da177e4 | 260 | __bdevname(ROOT_DEV, b); |
9361401e | 261 | #endif |
1da177e4 LT |
262 | printk("VFS: Cannot open root device \"%s\" or %s\n", |
263 | root_device_name, b); | |
dd2a345f | 264 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
1da177e4 | 265 | |
dd2a345f | 266 | printk_all_partitions(); |
55dc7db7 TH |
267 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT |
268 | printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " | |
269 | "explicit textual name for \"root=\" boot option.\n"); | |
270 | #endif | |
1da177e4 LT |
271 | panic("VFS: Unable to mount root fs on %s", b); |
272 | } | |
be6e028b | 273 | |
dd2a345f DG |
274 | printk("List of all partitions:\n"); |
275 | printk_all_partitions(); | |
be6e028b AW |
276 | printk("No filesystem could mount root, tried: "); |
277 | for (p = fs_names; *p; p += strlen(p)+1) | |
278 | printk(" %s", p); | |
279 | printk("\n"); | |
9361401e DH |
280 | #ifdef CONFIG_BLOCK |
281 | __bdevname(ROOT_DEV, b); | |
282 | #endif | |
283 | panic("VFS: Unable to mount root fs on %s", b); | |
1da177e4 LT |
284 | out: |
285 | putname(fs_names); | |
286 | } | |
287 | ||
288 | #ifdef CONFIG_ROOT_NFS | |
289 | static int __init mount_nfs_root(void) | |
290 | { | |
291 | void *data = nfs_root_data(); | |
292 | ||
bdaf8529 | 293 | create_dev("/dev/root", ROOT_DEV); |
1da177e4 LT |
294 | if (data && |
295 | do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0) | |
296 | return 1; | |
297 | return 0; | |
298 | } | |
299 | #endif | |
300 | ||
301 | #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) | |
302 | void __init change_floppy(char *fmt, ...) | |
303 | { | |
304 | struct termios termios; | |
305 | char buf[80]; | |
306 | char c; | |
307 | int fd; | |
308 | va_list args; | |
309 | va_start(args, fmt); | |
310 | vsprintf(buf, fmt, args); | |
311 | va_end(args); | |
312 | fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); | |
313 | if (fd >= 0) { | |
314 | sys_ioctl(fd, FDEJECT, 0); | |
315 | sys_close(fd); | |
316 | } | |
317 | printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); | |
318 | fd = sys_open("/dev/console", O_RDWR, 0); | |
319 | if (fd >= 0) { | |
320 | sys_ioctl(fd, TCGETS, (long)&termios); | |
321 | termios.c_lflag &= ~ICANON; | |
322 | sys_ioctl(fd, TCSETSF, (long)&termios); | |
323 | sys_read(fd, &c, 1); | |
324 | termios.c_lflag |= ICANON; | |
325 | sys_ioctl(fd, TCSETSF, (long)&termios); | |
326 | sys_close(fd); | |
327 | } | |
328 | } | |
329 | #endif | |
330 | ||
331 | void __init mount_root(void) | |
332 | { | |
333 | #ifdef CONFIG_ROOT_NFS | |
334 | if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) { | |
335 | if (mount_nfs_root()) | |
336 | return; | |
337 | ||
338 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); | |
339 | ROOT_DEV = Root_FD0; | |
340 | } | |
341 | #endif | |
342 | #ifdef CONFIG_BLK_DEV_FD | |
343 | if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { | |
344 | /* rd_doload is 2 for a dual initrd/ramload setup */ | |
345 | if (rd_doload==2) { | |
346 | if (rd_load_disk(1)) { | |
347 | ROOT_DEV = Root_RAM1; | |
348 | root_device_name = NULL; | |
349 | } | |
350 | } else | |
351 | change_floppy("root floppy"); | |
352 | } | |
353 | #endif | |
9361401e | 354 | #ifdef CONFIG_BLOCK |
bdaf8529 | 355 | create_dev("/dev/root", ROOT_DEV); |
1da177e4 | 356 | mount_block_root("/dev/root", root_mountflags); |
9361401e | 357 | #endif |
1da177e4 LT |
358 | } |
359 | ||
360 | /* | |
361 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. | |
362 | */ | |
363 | void __init prepare_namespace(void) | |
364 | { | |
365 | int is_floppy; | |
366 | ||
1da177e4 LT |
367 | if (root_delay) { |
368 | printk(KERN_INFO "Waiting %dsec before mounting root device...\n", | |
369 | root_delay); | |
370 | ssleep(root_delay); | |
371 | } | |
372 | ||
216773a7 AV |
373 | /* |
374 | * wait for the known devices to complete their probing | |
375 | * | |
376 | * Note: this is a potential source of long boot delays. | |
377 | * For example, it is not atypical to wait 5 seconds here | |
378 | * for the touchpad of a laptop to initialize. | |
379 | */ | |
380 | wait_for_device_probe(); | |
d779249e | 381 | |
1da177e4 LT |
382 | md_run_setup(); |
383 | ||
384 | if (saved_root_name[0]) { | |
385 | root_device_name = saved_root_name; | |
2d62f488 AH |
386 | if (!strncmp(root_device_name, "mtd", 3) || |
387 | !strncmp(root_device_name, "ubi", 3)) { | |
e9482b43 JE |
388 | mount_block_root(root_device_name, root_mountflags); |
389 | goto out; | |
390 | } | |
1da177e4 LT |
391 | ROOT_DEV = name_to_dev_t(root_device_name); |
392 | if (strncmp(root_device_name, "/dev/", 5) == 0) | |
393 | root_device_name += 5; | |
394 | } | |
395 | ||
1da177e4 LT |
396 | if (initrd_load()) |
397 | goto out; | |
398 | ||
cc1ed754 PO |
399 | /* wait for any asynchronous scanning to complete */ |
400 | if ((ROOT_DEV == 0) && root_wait) { | |
401 | printk(KERN_INFO "Waiting for root device %s...\n", | |
402 | saved_root_name); | |
403 | while (driver_probe_done() != 0 || | |
404 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) | |
405 | msleep(100); | |
216773a7 | 406 | async_synchronize_full(); |
cc1ed754 PO |
407 | } |
408 | ||
409 | is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; | |
410 | ||
1da177e4 LT |
411 | if (is_floppy && rd_doload && rd_load_disk(0)) |
412 | ROOT_DEV = Root_RAM0; | |
413 | ||
414 | mount_root(); | |
415 | out: | |
1da177e4 LT |
416 | sys_mount(".", "/", NULL, MS_MOVE, NULL); |
417 | sys_chroot("."); | |
1da177e4 LT |
418 | } |
419 |