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