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