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