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> |
5ad4e53b | 17 | #include <linux/fs_struct.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | |
20 | #include <linux/nfs_fs.h> | |
21 | #include <linux/nfs_fs_sb.h> | |
22 | #include <linux/nfs_mount.h> | |
23 | ||
24 | #include "do_mounts.h" | |
25 | ||
1da177e4 LT |
26 | int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ |
27 | ||
9b04c997 | 28 | int root_mountflags = MS_RDONLY | MS_SILENT; |
f56f6d30 | 29 | static char * __initdata root_device_name; |
1da177e4 | 30 | static char __initdata saved_root_name[64]; |
cc1ed754 | 31 | static int __initdata root_wait; |
1da177e4 | 32 | |
1da177e4 LT |
33 | dev_t ROOT_DEV; |
34 | ||
1da177e4 LT |
35 | static int __init load_ramdisk(char *str) |
36 | { | |
37 | rd_doload = simple_strtol(str,NULL,0) & 3; | |
38 | return 1; | |
39 | } | |
40 | __setup("load_ramdisk=", load_ramdisk); | |
41 | ||
42 | static int __init readonly(char *str) | |
43 | { | |
44 | if (*str) | |
45 | return 0; | |
46 | root_mountflags |= MS_RDONLY; | |
47 | return 1; | |
48 | } | |
49 | ||
50 | static int __init readwrite(char *str) | |
51 | { | |
52 | if (*str) | |
53 | return 0; | |
54 | root_mountflags &= ~MS_RDONLY; | |
55 | return 1; | |
56 | } | |
57 | ||
58 | __setup("ro", readonly); | |
59 | __setup("rw", readwrite); | |
60 | ||
1da177e4 LT |
61 | /* |
62 | * Convert a name into device number. We accept the following variants: | |
63 | * | |
64 | * 1) device number in hexadecimal represents itself | |
65 | * 2) /dev/nfs represents Root_NFS (0xff) | |
66 | * 3) /dev/<disk_name> represents the device number of disk | |
67 | * 4) /dev/<disk_name><decimal> represents the device number | |
68 | * of partition - device number of disk plus the partition number | |
69 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is | |
70 | * used when disk name of partitioned disk ends on a digit. | |
71 | * | |
edfaa7c3 KS |
72 | * If name doesn't have fall into the categories above, we return (0,0). |
73 | * block_class is used to check if something is a disk name. If the disk | |
74 | * name contains slashes, the device name has them replaced with | |
75 | * bangs. | |
1da177e4 LT |
76 | */ |
77 | ||
78 | dev_t name_to_dev_t(char *name) | |
79 | { | |
80 | char s[32]; | |
81 | char *p; | |
82 | dev_t res = 0; | |
30f2f0eb | 83 | int part; |
1da177e4 LT |
84 | |
85 | if (strncmp(name, "/dev/", 5) != 0) { | |
86 | unsigned maj, min; | |
87 | ||
88 | if (sscanf(name, "%u:%u", &maj, &min) == 2) { | |
89 | res = MKDEV(maj, min); | |
90 | if (maj != MAJOR(res) || min != MINOR(res)) | |
91 | goto fail; | |
92 | } else { | |
93 | res = new_decode_dev(simple_strtoul(name, &p, 16)); | |
94 | if (*p) | |
95 | goto fail; | |
96 | } | |
97 | goto done; | |
98 | } | |
edfaa7c3 | 99 | |
1da177e4 LT |
100 | name += 5; |
101 | res = Root_NFS; | |
102 | if (strcmp(name, "nfs") == 0) | |
103 | goto done; | |
104 | res = Root_RAM0; | |
105 | if (strcmp(name, "ram") == 0) | |
106 | goto done; | |
107 | ||
108 | if (strlen(name) > 31) | |
109 | goto fail; | |
110 | strcpy(s, name); | |
111 | for (p = s; *p; p++) | |
112 | if (*p == '/') | |
113 | *p = '!'; | |
30f2f0eb KS |
114 | res = blk_lookup_devt(s, 0); |
115 | if (res) | |
116 | goto done; | |
117 | ||
118 | /* | |
119 | * try non-existant, but valid partition, which may only exist | |
120 | * after revalidating the disk, like partitioned md devices | |
121 | */ | |
122 | while (p > s && isdigit(p[-1])) | |
123 | p--; | |
124 | if (p == s || !*p || *p == '0') | |
125 | goto fail; | |
126 | ||
127 | /* try disk name without <part number> */ | |
128 | part = simple_strtoul(p, NULL, 10); | |
129 | *p = '\0'; | |
130 | res = blk_lookup_devt(s, part); | |
131 | if (res) | |
132 | goto done; | |
133 | ||
134 | /* try disk name without p<part number> */ | |
135 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') | |
136 | goto fail; | |
137 | p[-1] = '\0'; | |
138 | res = blk_lookup_devt(s, part); | |
1da177e4 LT |
139 | if (res) |
140 | goto done; | |
141 | ||
edfaa7c3 KS |
142 | fail: |
143 | return 0; | |
1da177e4 | 144 | done: |
1da177e4 | 145 | return res; |
1da177e4 LT |
146 | } |
147 | ||
148 | static int __init root_dev_setup(char *line) | |
149 | { | |
150 | strlcpy(saved_root_name, line, sizeof(saved_root_name)); | |
151 | return 1; | |
152 | } | |
153 | ||
154 | __setup("root=", root_dev_setup); | |
155 | ||
cc1ed754 PO |
156 | static int __init rootwait_setup(char *str) |
157 | { | |
158 | if (*str) | |
159 | return 0; | |
160 | root_wait = 1; | |
161 | return 1; | |
162 | } | |
163 | ||
164 | __setup("rootwait", rootwait_setup); | |
165 | ||
1da177e4 LT |
166 | static char * __initdata root_mount_data; |
167 | static int __init root_data_setup(char *str) | |
168 | { | |
169 | root_mount_data = str; | |
170 | return 1; | |
171 | } | |
172 | ||
173 | static char * __initdata root_fs_names; | |
174 | static int __init fs_names_setup(char *str) | |
175 | { | |
176 | root_fs_names = str; | |
177 | return 1; | |
178 | } | |
179 | ||
180 | static unsigned int __initdata root_delay; | |
181 | static int __init root_delay_setup(char *str) | |
182 | { | |
183 | root_delay = simple_strtoul(str, NULL, 0); | |
184 | return 1; | |
185 | } | |
186 | ||
187 | __setup("rootflags=", root_data_setup); | |
188 | __setup("rootfstype=", fs_names_setup); | |
189 | __setup("rootdelay=", root_delay_setup); | |
190 | ||
191 | static void __init get_fs_names(char *page) | |
192 | { | |
193 | char *s = page; | |
194 | ||
195 | if (root_fs_names) { | |
196 | strcpy(page, root_fs_names); | |
197 | while (*s++) { | |
198 | if (s[-1] == ',') | |
199 | s[-1] = '\0'; | |
200 | } | |
201 | } else { | |
202 | int len = get_filesystem_list(page); | |
203 | char *p, *next; | |
204 | ||
205 | page[len] = '\0'; | |
206 | for (p = page-1; p; p = next) { | |
207 | next = strchr(++p, '\n'); | |
208 | if (*p++ != '\t') | |
209 | continue; | |
210 | while ((*s++ = *p++) != '\n') | |
211 | ; | |
212 | s[-1] = '\0'; | |
213 | } | |
214 | } | |
215 | *s = '\0'; | |
216 | } | |
217 | ||
218 | static int __init do_mount_root(char *name, char *fs, int flags, void *data) | |
219 | { | |
220 | int err = sys_mount(name, "/root", fs, flags, data); | |
221 | if (err) | |
222 | return err; | |
223 | ||
224 | sys_chdir("/root"); | |
6ac08c39 | 225 | ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev; |
bca1033b | 226 | printk("VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", |
6ac08c39 JB |
227 | current->fs->pwd.mnt->mnt_sb->s_type->name, |
228 | current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ? | |
bca1033b | 229 | " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
1da177e4 LT |
230 | return 0; |
231 | } | |
232 | ||
233 | void __init mount_block_root(char *name, int flags) | |
234 | { | |
3b5c760e VN |
235 | char *fs_names = __getname_gfp(GFP_KERNEL |
236 | | __GFP_NOTRACK_FALSE_POSITIVE); | |
1da177e4 | 237 | char *p; |
9361401e | 238 | #ifdef CONFIG_BLOCK |
1da177e4 | 239 | char b[BDEVNAME_SIZE]; |
9361401e DH |
240 | #else |
241 | const char *b = name; | |
242 | #endif | |
1da177e4 LT |
243 | |
244 | get_fs_names(fs_names); | |
245 | retry: | |
246 | for (p = fs_names; *p; p += strlen(p)+1) { | |
247 | int err = do_mount_root(name, p, flags, root_mount_data); | |
248 | switch (err) { | |
249 | case 0: | |
250 | goto out; | |
251 | case -EACCES: | |
252 | flags |= MS_RDONLY; | |
253 | goto retry; | |
254 | case -EINVAL: | |
255 | continue; | |
256 | } | |
257 | /* | |
258 | * Allow the user to distinguish between failed sys_open | |
259 | * and bad superblock on root device. | |
dd2a345f | 260 | * and give them a list of the available devices |
1da177e4 | 261 | */ |
9361401e | 262 | #ifdef CONFIG_BLOCK |
1da177e4 | 263 | __bdevname(ROOT_DEV, b); |
9361401e | 264 | #endif |
1da177e4 LT |
265 | printk("VFS: Cannot open root device \"%s\" or %s\n", |
266 | root_device_name, b); | |
dd2a345f | 267 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
1da177e4 | 268 | |
dd2a345f | 269 | printk_all_partitions(); |
55dc7db7 TH |
270 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT |
271 | printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " | |
272 | "explicit textual name for \"root=\" boot option.\n"); | |
273 | #endif | |
1da177e4 LT |
274 | panic("VFS: Unable to mount root fs on %s", b); |
275 | } | |
be6e028b | 276 | |
dd2a345f DG |
277 | printk("List of all partitions:\n"); |
278 | printk_all_partitions(); | |
be6e028b AW |
279 | printk("No filesystem could mount root, tried: "); |
280 | for (p = fs_names; *p; p += strlen(p)+1) | |
281 | printk(" %s", p); | |
282 | printk("\n"); | |
9361401e DH |
283 | #ifdef CONFIG_BLOCK |
284 | __bdevname(ROOT_DEV, b); | |
285 | #endif | |
286 | panic("VFS: Unable to mount root fs on %s", b); | |
1da177e4 LT |
287 | out: |
288 | putname(fs_names); | |
289 | } | |
290 | ||
291 | #ifdef CONFIG_ROOT_NFS | |
292 | static int __init mount_nfs_root(void) | |
293 | { | |
294 | void *data = nfs_root_data(); | |
295 | ||
bdaf8529 | 296 | create_dev("/dev/root", ROOT_DEV); |
1da177e4 LT |
297 | if (data && |
298 | do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0) | |
299 | return 1; | |
300 | return 0; | |
301 | } | |
302 | #endif | |
303 | ||
304 | #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) | |
305 | void __init change_floppy(char *fmt, ...) | |
306 | { | |
307 | struct termios termios; | |
308 | char buf[80]; | |
309 | char c; | |
310 | int fd; | |
311 | va_list args; | |
312 | va_start(args, fmt); | |
313 | vsprintf(buf, fmt, args); | |
314 | va_end(args); | |
315 | fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); | |
316 | if (fd >= 0) { | |
317 | sys_ioctl(fd, FDEJECT, 0); | |
318 | sys_close(fd); | |
319 | } | |
320 | printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); | |
321 | fd = sys_open("/dev/console", O_RDWR, 0); | |
322 | if (fd >= 0) { | |
323 | sys_ioctl(fd, TCGETS, (long)&termios); | |
324 | termios.c_lflag &= ~ICANON; | |
325 | sys_ioctl(fd, TCSETSF, (long)&termios); | |
326 | sys_read(fd, &c, 1); | |
327 | termios.c_lflag |= ICANON; | |
328 | sys_ioctl(fd, TCSETSF, (long)&termios); | |
329 | sys_close(fd); | |
330 | } | |
331 | } | |
332 | #endif | |
333 | ||
334 | void __init mount_root(void) | |
335 | { | |
336 | #ifdef CONFIG_ROOT_NFS | |
337 | if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) { | |
338 | if (mount_nfs_root()) | |
339 | return; | |
340 | ||
341 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); | |
342 | ROOT_DEV = Root_FD0; | |
343 | } | |
344 | #endif | |
345 | #ifdef CONFIG_BLK_DEV_FD | |
346 | if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { | |
347 | /* rd_doload is 2 for a dual initrd/ramload setup */ | |
348 | if (rd_doload==2) { | |
349 | if (rd_load_disk(1)) { | |
350 | ROOT_DEV = Root_RAM1; | |
351 | root_device_name = NULL; | |
352 | } | |
353 | } else | |
354 | change_floppy("root floppy"); | |
355 | } | |
356 | #endif | |
9361401e | 357 | #ifdef CONFIG_BLOCK |
bdaf8529 | 358 | create_dev("/dev/root", ROOT_DEV); |
1da177e4 | 359 | mount_block_root("/dev/root", root_mountflags); |
9361401e | 360 | #endif |
1da177e4 LT |
361 | } |
362 | ||
363 | /* | |
364 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. | |
365 | */ | |
366 | void __init prepare_namespace(void) | |
367 | { | |
368 | int is_floppy; | |
369 | ||
1da177e4 LT |
370 | if (root_delay) { |
371 | printk(KERN_INFO "Waiting %dsec before mounting root device...\n", | |
372 | root_delay); | |
373 | ssleep(root_delay); | |
374 | } | |
375 | ||
216773a7 AV |
376 | /* |
377 | * wait for the known devices to complete their probing | |
378 | * | |
379 | * Note: this is a potential source of long boot delays. | |
380 | * For example, it is not atypical to wait 5 seconds here | |
381 | * for the touchpad of a laptop to initialize. | |
382 | */ | |
383 | wait_for_device_probe(); | |
d779249e | 384 | |
1da177e4 LT |
385 | md_run_setup(); |
386 | ||
387 | if (saved_root_name[0]) { | |
388 | root_device_name = saved_root_name; | |
2d62f488 AH |
389 | if (!strncmp(root_device_name, "mtd", 3) || |
390 | !strncmp(root_device_name, "ubi", 3)) { | |
e9482b43 JE |
391 | mount_block_root(root_device_name, root_mountflags); |
392 | goto out; | |
393 | } | |
1da177e4 LT |
394 | ROOT_DEV = name_to_dev_t(root_device_name); |
395 | if (strncmp(root_device_name, "/dev/", 5) == 0) | |
396 | root_device_name += 5; | |
397 | } | |
398 | ||
1da177e4 LT |
399 | if (initrd_load()) |
400 | goto out; | |
401 | ||
cc1ed754 PO |
402 | /* wait for any asynchronous scanning to complete */ |
403 | if ((ROOT_DEV == 0) && root_wait) { | |
404 | printk(KERN_INFO "Waiting for root device %s...\n", | |
405 | saved_root_name); | |
406 | while (driver_probe_done() != 0 || | |
407 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) | |
408 | msleep(100); | |
216773a7 | 409 | async_synchronize_full(); |
cc1ed754 PO |
410 | } |
411 | ||
412 | is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; | |
413 | ||
1da177e4 LT |
414 | if (is_floppy && rd_doload && rd_load_disk(0)) |
415 | ROOT_DEV = Root_RAM0; | |
416 | ||
417 | mount_root(); | |
418 | out: | |
2b2af54a | 419 | devtmpfs_mount("dev"); |
1da177e4 LT |
420 | sys_mount(".", "/", NULL, MS_MOVE, NULL); |
421 | sys_chroot("."); | |
1da177e4 | 422 | } |