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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/genhd.h> |
11 | #include <linux/mount.h> |
12 | #include <linux/device.h> |
13 | #include <linux/init.h> |
14 | #include <linux/fs.h> |
15 | #include <linux/initrd.h> |
16 | #include <linux/async.h> |
17 | #include <linux/fs_struct.h> |
18 | #include <linux/slab.h> |
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 | |
26 | int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ |
27 | |
28 | int root_mountflags = MS_RDONLY | MS_SILENT; |
29 | static char * __initdata root_device_name; |
30 | static char __initdata saved_root_name[64]; |
31 | static int __initdata root_wait; |
32 | |
33 | dev_t ROOT_DEV; |
34 | |
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 | |
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 | * |
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. |
76 | */ |
77 | |
78 | dev_t name_to_dev_t(char *name) |
79 | { |
80 | char s[32]; |
81 | char *p; |
82 | dev_t res = 0; |
83 | int part; |
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 | } |
99 | |
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 = '!'; |
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); |
139 | if (res) |
140 | goto done; |
141 | |
142 | fail: |
143 | return 0; |
144 | done: |
145 | return res; |
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 | |
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 | |
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"); |
225 | ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev; |
226 | printk("VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", |
227 | current->fs->pwd.mnt->mnt_sb->s_type->name, |
228 | current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ? |
229 | " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
230 | return 0; |
231 | } |
232 | |
233 | void __init mount_block_root(char *name, int flags) |
234 | { |
235 | char *fs_names = __getname_gfp(GFP_KERNEL |
236 | | __GFP_NOTRACK_FALSE_POSITIVE); |
237 | char *p; |
238 | #ifdef CONFIG_BLOCK |
239 | char b[BDEVNAME_SIZE]; |
240 | #else |
241 | const char *b = name; |
242 | #endif |
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. |
260 | * and give them a list of the available devices |
261 | */ |
262 | #ifdef CONFIG_BLOCK |
263 | __bdevname(ROOT_DEV, b); |
264 | #endif |
265 | printk("VFS: Cannot open root device \"%s\" or %s\n", |
266 | root_device_name, b); |
267 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
268 | |
269 | printk_all_partitions(); |
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 |
274 | panic("VFS: Unable to mount root fs on %s", b); |
275 | } |
276 | |
277 | printk("List of all partitions:\n"); |
278 | printk_all_partitions(); |
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"); |
283 | #ifdef CONFIG_BLOCK |
284 | __bdevname(ROOT_DEV, b); |
285 | #endif |
286 | panic("VFS: Unable to mount root fs on %s", b); |
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 | |
296 | create_dev("/dev/root", ROOT_DEV); |
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 |
357 | #ifdef CONFIG_BLOCK |
358 | create_dev("/dev/root", ROOT_DEV); |
359 | mount_block_root("/dev/root", root_mountflags); |
360 | #endif |
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 | |
370 | if (root_delay) { |
371 | printk(KERN_INFO "Waiting %dsec before mounting root device...\n", |
372 | root_delay); |
373 | ssleep(root_delay); |
374 | } |
375 | |
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(); |
384 | |
385 | md_run_setup(); |
386 | |
387 | if (saved_root_name[0]) { |
388 | root_device_name = saved_root_name; |
389 | if (!strncmp(root_device_name, "mtd", 3) || |
390 | !strncmp(root_device_name, "ubi", 3)) { |
391 | mount_block_root(root_device_name, root_mountflags); |
392 | goto out; |
393 | } |
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 | |
399 | if (initrd_load()) |
400 | goto out; |
401 | |
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); |
409 | async_synchronize_full(); |
410 | } |
411 | |
412 | is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; |
413 | |
414 | if (is_floppy && rd_doload && rd_load_disk(0)) |
415 | ROOT_DEV = Root_RAM0; |
416 | |
417 | mount_root(); |
418 | out: |
419 | devtmpfs_mount("dev"); |
420 | sys_mount(".", "/", NULL, MS_MOVE, NULL); |
421 | sys_chroot("."); |
422 | } |
423 |
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