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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
26int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
27
28int root_mountflags = MS_RDONLY | MS_SILENT;
29static char * __initdata root_device_name;
30static char __initdata saved_root_name[64];
31static int __initdata root_wait;
32
33dev_t ROOT_DEV;
34
35static 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
42static int __init readonly(char *str)
43{
44 if (*str)
45 return 0;
46 root_mountflags |= MS_RDONLY;
47 return 1;
48}
49
50static 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#ifdef CONFIG_BLOCK
62/**
63 * match_dev_by_uuid - callback for finding a partition using its uuid
64 * @dev: device passed in by the caller
65 * @data: opaque pointer to a 36 byte char array with a UUID
66 *
67 * Returns 1 if the device matches, and 0 otherwise.
68 */
69static int match_dev_by_uuid(struct device *dev, void *data)
70{
71 u8 *uuid = data;
72 struct hd_struct *part = dev_to_part(dev);
73
74 if (!part->info)
75 goto no_match;
76
77 if (memcmp(uuid, part->info->uuid, sizeof(part->info->uuid)))
78 goto no_match;
79
80 return 1;
81no_match:
82 return 0;
83}
84
85
86/**
87 * devt_from_partuuid - looks up the dev_t of a partition by its UUID
88 * @uuid: 36 byte char array containing a hex ascii UUID
89 *
90 * The function will return the first partition which contains a matching
91 * UUID value in its partition_meta_info struct. This does not search
92 * by filesystem UUIDs.
93 *
94 * Returns the matching dev_t on success or 0 on failure.
95 */
96static dev_t devt_from_partuuid(char *uuid_str)
97{
98 dev_t res = 0;
99 struct device *dev = NULL;
100 u8 uuid[16];
101
102 /* Pack the requested UUID in the expected format. */
103 part_pack_uuid(uuid_str, uuid);
104
105 dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid);
106 if (!dev)
107 goto done;
108
109 res = dev->devt;
110 put_device(dev);
111
112done:
113 return res;
114}
115#endif
116
117/*
118 * Convert a name into device number. We accept the following variants:
119 *
120 * 1) device number in hexadecimal represents itself
121 * 2) /dev/nfs represents Root_NFS (0xff)
122 * 3) /dev/<disk_name> represents the device number of disk
123 * 4) /dev/<disk_name><decimal> represents the device number
124 * of partition - device number of disk plus the partition number
125 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
126 * used when disk name of partitioned disk ends on a digit.
127 * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
128 * unique id of a partition if the partition table provides it.
129 *
130 * If name doesn't have fall into the categories above, we return (0,0).
131 * block_class is used to check if something is a disk name. If the disk
132 * name contains slashes, the device name has them replaced with
133 * bangs.
134 */
135
136dev_t name_to_dev_t(char *name)
137{
138 char s[32];
139 char *p;
140 dev_t res = 0;
141 int part;
142
143#ifdef CONFIG_BLOCK
144 if (strncmp(name, "PARTUUID=", 9) == 0) {
145 name += 9;
146 if (strlen(name) != 36)
147 goto fail;
148 res = devt_from_partuuid(name);
149 if (!res)
150 goto fail;
151 goto done;
152 }
153#endif
154
155 if (strncmp(name, "/dev/", 5) != 0) {
156 unsigned maj, min;
157
158 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
159 res = MKDEV(maj, min);
160 if (maj != MAJOR(res) || min != MINOR(res))
161 goto fail;
162 } else {
163 res = new_decode_dev(simple_strtoul(name, &p, 16));
164 if (*p)
165 goto fail;
166 }
167 goto done;
168 }
169
170 name += 5;
171 res = Root_NFS;
172 if (strcmp(name, "nfs") == 0)
173 goto done;
174 res = Root_RAM0;
175 if (strcmp(name, "ram") == 0)
176 goto done;
177
178 if (strlen(name) > 31)
179 goto fail;
180 strcpy(s, name);
181 for (p = s; *p; p++)
182 if (*p == '/')
183 *p = '!';
184 res = blk_lookup_devt(s, 0);
185 if (res)
186 goto done;
187
188 /*
189 * try non-existent, but valid partition, which may only exist
190 * after revalidating the disk, like partitioned md devices
191 */
192 while (p > s && isdigit(p[-1]))
193 p--;
194 if (p == s || !*p || *p == '0')
195 goto fail;
196
197 /* try disk name without <part number> */
198 part = simple_strtoul(p, NULL, 10);
199 *p = '\0';
200 res = blk_lookup_devt(s, part);
201 if (res)
202 goto done;
203
204 /* try disk name without p<part number> */
205 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
206 goto fail;
207 p[-1] = '\0';
208 res = blk_lookup_devt(s, part);
209 if (res)
210 goto done;
211
212fail:
213 return 0;
214done:
215 return res;
216}
217
218static int __init root_dev_setup(char *line)
219{
220 strlcpy(saved_root_name, line, sizeof(saved_root_name));
221 return 1;
222}
223
224__setup("root=", root_dev_setup);
225
226static int __init rootwait_setup(char *str)
227{
228 if (*str)
229 return 0;
230 root_wait = 1;
231 return 1;
232}
233
234__setup("rootwait", rootwait_setup);
235
236static char * __initdata root_mount_data;
237static int __init root_data_setup(char *str)
238{
239 root_mount_data = str;
240 return 1;
241}
242
243static char * __initdata root_fs_names;
244static int __init fs_names_setup(char *str)
245{
246 root_fs_names = str;
247 return 1;
248}
249
250static unsigned int __initdata root_delay;
251static int __init root_delay_setup(char *str)
252{
253 root_delay = simple_strtoul(str, NULL, 0);
254 return 1;
255}
256
257__setup("rootflags=", root_data_setup);
258__setup("rootfstype=", fs_names_setup);
259__setup("rootdelay=", root_delay_setup);
260
261static void __init get_fs_names(char *page)
262{
263 char *s = page;
264
265 if (root_fs_names) {
266 strcpy(page, root_fs_names);
267 while (*s++) {
268 if (s[-1] == ',')
269 s[-1] = '\0';
270 }
271 } else {
272 int len = get_filesystem_list(page);
273 char *p, *next;
274
275 page[len] = '\0';
276 for (p = page-1; p; p = next) {
277 next = strchr(++p, '\n');
278 if (*p++ != '\t')
279 continue;
280 while ((*s++ = *p++) != '\n')
281 ;
282 s[-1] = '\0';
283 }
284 }
285 *s = '\0';
286}
287
288static int __init do_mount_root(char *name, char *fs, int flags, void *data)
289{
290 int err = sys_mount(name, "/root", fs, flags, data);
291 if (err)
292 return err;
293
294 sys_chdir((const char __user __force *)"/root");
295 ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
296 printk(KERN_INFO
297 "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
298 current->fs->pwd.mnt->mnt_sb->s_type->name,
299 current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
300 " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
301 return 0;
302}
303
304void __init mount_block_root(char *name, int flags)
305{
306 char *fs_names = __getname_gfp(GFP_KERNEL
307 | __GFP_NOTRACK_FALSE_POSITIVE);
308 char *p;
309#ifdef CONFIG_BLOCK
310 char b[BDEVNAME_SIZE];
311#else
312 const char *b = name;
313#endif
314
315 get_fs_names(fs_names);
316retry:
317 for (p = fs_names; *p; p += strlen(p)+1) {
318 int err = do_mount_root(name, p, flags, root_mount_data);
319 switch (err) {
320 case 0:
321 goto out;
322 case -EACCES:
323 flags |= MS_RDONLY;
324 goto retry;
325 case -EINVAL:
326 continue;
327 }
328 /*
329 * Allow the user to distinguish between failed sys_open
330 * and bad superblock on root device.
331 * and give them a list of the available devices
332 */
333#ifdef CONFIG_BLOCK
334 __bdevname(ROOT_DEV, b);
335#endif
336 printk("VFS: Cannot open root device \"%s\" or %s\n",
337 root_device_name, b);
338 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
339
340 printk_all_partitions();
341#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
342 printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
343 "explicit textual name for \"root=\" boot option.\n");
344#endif
345 panic("VFS: Unable to mount root fs on %s", b);
346 }
347
348 printk("List of all partitions:\n");
349 printk_all_partitions();
350 printk("No filesystem could mount root, tried: ");
351 for (p = fs_names; *p; p += strlen(p)+1)
352 printk(" %s", p);
353 printk("\n");
354#ifdef CONFIG_BLOCK
355 __bdevname(ROOT_DEV, b);
356#endif
357 panic("VFS: Unable to mount root fs on %s", b);
358out:
359 putname(fs_names);
360}
361
362#ifdef CONFIG_ROOT_NFS
363static int __init mount_nfs_root(void)
364{
365 char *root_dev, *root_data;
366
367 if (nfs_root_data(&root_dev, &root_data) != 0)
368 return 0;
369 if (do_mount_root(root_dev, "nfs", root_mountflags, root_data) != 0)
370 return 0;
371 return 1;
372}
373#endif
374
375#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
376void __init change_floppy(char *fmt, ...)
377{
378 struct termios termios;
379 char buf[80];
380 char c;
381 int fd;
382 va_list args;
383 va_start(args, fmt);
384 vsprintf(buf, fmt, args);
385 va_end(args);
386 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
387 if (fd >= 0) {
388 sys_ioctl(fd, FDEJECT, 0);
389 sys_close(fd);
390 }
391 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
392 fd = sys_open("/dev/console", O_RDWR, 0);
393 if (fd >= 0) {
394 sys_ioctl(fd, TCGETS, (long)&termios);
395 termios.c_lflag &= ~ICANON;
396 sys_ioctl(fd, TCSETSF, (long)&termios);
397 sys_read(fd, &c, 1);
398 termios.c_lflag |= ICANON;
399 sys_ioctl(fd, TCSETSF, (long)&termios);
400 sys_close(fd);
401 }
402}
403#endif
404
405void __init mount_root(void)
406{
407#ifdef CONFIG_ROOT_NFS
408 if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
409 if (mount_nfs_root())
410 return;
411
412 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
413 ROOT_DEV = Root_FD0;
414 }
415#endif
416#ifdef CONFIG_BLK_DEV_FD
417 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
418 /* rd_doload is 2 for a dual initrd/ramload setup */
419 if (rd_doload==2) {
420 if (rd_load_disk(1)) {
421 ROOT_DEV = Root_RAM1;
422 root_device_name = NULL;
423 }
424 } else
425 change_floppy("root floppy");
426 }
427#endif
428#ifdef CONFIG_BLOCK
429 create_dev("/dev/root", ROOT_DEV);
430 mount_block_root("/dev/root", root_mountflags);
431#endif
432}
433
434/*
435 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
436 */
437void __init prepare_namespace(void)
438{
439 int is_floppy;
440
441 if (root_delay) {
442 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
443 root_delay);
444 ssleep(root_delay);
445 }
446
447 /*
448 * wait for the known devices to complete their probing
449 *
450 * Note: this is a potential source of long boot delays.
451 * For example, it is not atypical to wait 5 seconds here
452 * for the touchpad of a laptop to initialize.
453 */
454 wait_for_device_probe();
455
456 md_run_setup();
457
458 if (saved_root_name[0]) {
459 root_device_name = saved_root_name;
460 if (!strncmp(root_device_name, "mtd", 3) ||
461 !strncmp(root_device_name, "ubi", 3)) {
462 mount_block_root(root_device_name, root_mountflags);
463 goto out;
464 }
465 ROOT_DEV = name_to_dev_t(root_device_name);
466 if (strncmp(root_device_name, "/dev/", 5) == 0)
467 root_device_name += 5;
468 }
469
470 if (initrd_load())
471 goto out;
472
473 /* wait for any asynchronous scanning to complete */
474 if ((ROOT_DEV == 0) && root_wait) {
475 printk(KERN_INFO "Waiting for root device %s...\n",
476 saved_root_name);
477 while (driver_probe_done() != 0 ||
478 (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
479 msleep(100);
480 async_synchronize_full();
481 }
482
483 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
484
485 if (is_floppy && rd_doload && rd_load_disk(0))
486 ROOT_DEV = Root_RAM0;
487
488 mount_root();
489out:
490 devtmpfs_mount("dev");
491 sys_mount(".", "/", NULL, MS_MOVE, NULL);
492 sys_chroot((const char __user __force *)".");
493}
1/*
2 * Many of the syscalls used in this file expect some of the arguments
3 * to be __user pointers not __kernel pointers. To limit the sparse
4 * noise, turn off sparse checking for this file.
5 */
6#ifdef __CHECKER__
7#undef __CHECKER__
8#warning "Sparse checking disabled for this file"
9#endif
10
11#include <linux/module.h>
12#include <linux/sched.h>
13#include <linux/ctype.h>
14#include <linux/fd.h>
15#include <linux/tty.h>
16#include <linux/suspend.h>
17#include <linux/root_dev.h>
18#include <linux/security.h>
19#include <linux/delay.h>
20#include <linux/genhd.h>
21#include <linux/mount.h>
22#include <linux/device.h>
23#include <linux/init.h>
24#include <linux/fs.h>
25#include <linux/initrd.h>
26#include <linux/async.h>
27#include <linux/fs_struct.h>
28#include <linux/slab.h>
29
30#include <linux/nfs_fs.h>
31#include <linux/nfs_fs_sb.h>
32#include <linux/nfs_mount.h>
33
34#include "do_mounts.h"
35
36int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
37
38int root_mountflags = MS_RDONLY | MS_SILENT;
39static char * __initdata root_device_name;
40static char __initdata saved_root_name[64];
41static int root_wait;
42
43dev_t ROOT_DEV;
44
45static int __init load_ramdisk(char *str)
46{
47 rd_doload = simple_strtol(str,NULL,0) & 3;
48 return 1;
49}
50__setup("load_ramdisk=", load_ramdisk);
51
52static int __init readonly(char *str)
53{
54 if (*str)
55 return 0;
56 root_mountflags |= MS_RDONLY;
57 return 1;
58}
59
60static int __init readwrite(char *str)
61{
62 if (*str)
63 return 0;
64 root_mountflags &= ~MS_RDONLY;
65 return 1;
66}
67
68__setup("ro", readonly);
69__setup("rw", readwrite);
70
71#ifdef CONFIG_BLOCK
72/**
73 * match_dev_by_uuid - callback for finding a partition using its uuid
74 * @dev: device passed in by the caller
75 * @data: opaque pointer to a 36 byte char array with a UUID
76 *
77 * Returns 1 if the device matches, and 0 otherwise.
78 */
79static int match_dev_by_uuid(struct device *dev, void *data)
80{
81 u8 *uuid = data;
82 struct hd_struct *part = dev_to_part(dev);
83
84 if (!part->info)
85 goto no_match;
86
87 if (memcmp(uuid, part->info->uuid, sizeof(part->info->uuid)))
88 goto no_match;
89
90 return 1;
91no_match:
92 return 0;
93}
94
95
96/**
97 * devt_from_partuuid - looks up the dev_t of a partition by its UUID
98 * @uuid: min 36 byte char array containing a hex ascii UUID
99 *
100 * The function will return the first partition which contains a matching
101 * UUID value in its partition_meta_info struct. This does not search
102 * by filesystem UUIDs.
103 *
104 * If @uuid is followed by a "/PARTNROFF=%d", then the number will be
105 * extracted and used as an offset from the partition identified by the UUID.
106 *
107 * Returns the matching dev_t on success or 0 on failure.
108 */
109static dev_t devt_from_partuuid(char *uuid_str)
110{
111 dev_t res = 0;
112 struct device *dev = NULL;
113 u8 uuid[16];
114 struct gendisk *disk;
115 struct hd_struct *part;
116 int offset = 0;
117
118 if (strlen(uuid_str) < 36)
119 goto done;
120
121 /* Check for optional partition number offset attributes. */
122 if (uuid_str[36]) {
123 char c = 0;
124 /* Explicitly fail on poor PARTUUID syntax. */
125 if (sscanf(&uuid_str[36],
126 "/PARTNROFF=%d%c", &offset, &c) != 1) {
127 printk(KERN_ERR "VFS: PARTUUID= is invalid.\n"
128 "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n");
129 if (root_wait)
130 printk(KERN_ERR
131 "Disabling rootwait; root= is invalid.\n");
132 root_wait = 0;
133 goto done;
134 }
135 }
136
137 /* Pack the requested UUID in the expected format. */
138 part_pack_uuid(uuid_str, uuid);
139
140 dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid);
141 if (!dev)
142 goto done;
143
144 res = dev->devt;
145
146 /* Attempt to find the partition by offset. */
147 if (!offset)
148 goto no_offset;
149
150 res = 0;
151 disk = part_to_disk(dev_to_part(dev));
152 part = disk_get_part(disk, dev_to_part(dev)->partno + offset);
153 if (part) {
154 res = part_devt(part);
155 put_device(part_to_dev(part));
156 }
157
158no_offset:
159 put_device(dev);
160done:
161 return res;
162}
163#endif
164
165/*
166 * Convert a name into device number. We accept the following variants:
167 *
168 * 1) device number in hexadecimal represents itself
169 * 2) /dev/nfs represents Root_NFS (0xff)
170 * 3) /dev/<disk_name> represents the device number of disk
171 * 4) /dev/<disk_name><decimal> represents the device number
172 * of partition - device number of disk plus the partition number
173 * 5) /dev/<disk_name>p<decimal> - same as the above, that form is
174 * used when disk name of partitioned disk ends on a digit.
175 * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
176 * unique id of a partition if the partition table provides it.
177 * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to
178 * a partition with a known unique id.
179 *
180 * If name doesn't have fall into the categories above, we return (0,0).
181 * block_class is used to check if something is a disk name. If the disk
182 * name contains slashes, the device name has them replaced with
183 * bangs.
184 */
185
186dev_t name_to_dev_t(char *name)
187{
188 char s[32];
189 char *p;
190 dev_t res = 0;
191 int part;
192
193#ifdef CONFIG_BLOCK
194 if (strncmp(name, "PARTUUID=", 9) == 0) {
195 name += 9;
196 res = devt_from_partuuid(name);
197 if (!res)
198 goto fail;
199 goto done;
200 }
201#endif
202
203 if (strncmp(name, "/dev/", 5) != 0) {
204 unsigned maj, min;
205
206 if (sscanf(name, "%u:%u", &maj, &min) == 2) {
207 res = MKDEV(maj, min);
208 if (maj != MAJOR(res) || min != MINOR(res))
209 goto fail;
210 } else {
211 res = new_decode_dev(simple_strtoul(name, &p, 16));
212 if (*p)
213 goto fail;
214 }
215 goto done;
216 }
217
218 name += 5;
219 res = Root_NFS;
220 if (strcmp(name, "nfs") == 0)
221 goto done;
222 res = Root_RAM0;
223 if (strcmp(name, "ram") == 0)
224 goto done;
225
226 if (strlen(name) > 31)
227 goto fail;
228 strcpy(s, name);
229 for (p = s; *p; p++)
230 if (*p == '/')
231 *p = '!';
232 res = blk_lookup_devt(s, 0);
233 if (res)
234 goto done;
235
236 /*
237 * try non-existent, but valid partition, which may only exist
238 * after revalidating the disk, like partitioned md devices
239 */
240 while (p > s && isdigit(p[-1]))
241 p--;
242 if (p == s || !*p || *p == '0')
243 goto fail;
244
245 /* try disk name without <part number> */
246 part = simple_strtoul(p, NULL, 10);
247 *p = '\0';
248 res = blk_lookup_devt(s, part);
249 if (res)
250 goto done;
251
252 /* try disk name without p<part number> */
253 if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p')
254 goto fail;
255 p[-1] = '\0';
256 res = blk_lookup_devt(s, part);
257 if (res)
258 goto done;
259
260fail:
261 return 0;
262done:
263 return res;
264}
265
266static int __init root_dev_setup(char *line)
267{
268 strlcpy(saved_root_name, line, sizeof(saved_root_name));
269 return 1;
270}
271
272__setup("root=", root_dev_setup);
273
274static int __init rootwait_setup(char *str)
275{
276 if (*str)
277 return 0;
278 root_wait = 1;
279 return 1;
280}
281
282__setup("rootwait", rootwait_setup);
283
284static char * __initdata root_mount_data;
285static int __init root_data_setup(char *str)
286{
287 root_mount_data = str;
288 return 1;
289}
290
291static char * __initdata root_fs_names;
292static int __init fs_names_setup(char *str)
293{
294 root_fs_names = str;
295 return 1;
296}
297
298static unsigned int __initdata root_delay;
299static int __init root_delay_setup(char *str)
300{
301 root_delay = simple_strtoul(str, NULL, 0);
302 return 1;
303}
304
305__setup("rootflags=", root_data_setup);
306__setup("rootfstype=", fs_names_setup);
307__setup("rootdelay=", root_delay_setup);
308
309static void __init get_fs_names(char *page)
310{
311 char *s = page;
312
313 if (root_fs_names) {
314 strcpy(page, root_fs_names);
315 while (*s++) {
316 if (s[-1] == ',')
317 s[-1] = '\0';
318 }
319 } else {
320 int len = get_filesystem_list(page);
321 char *p, *next;
322
323 page[len] = '\0';
324 for (p = page-1; p; p = next) {
325 next = strchr(++p, '\n');
326 if (*p++ != '\t')
327 continue;
328 while ((*s++ = *p++) != '\n')
329 ;
330 s[-1] = '\0';
331 }
332 }
333 *s = '\0';
334}
335
336static int __init do_mount_root(char *name, char *fs, int flags, void *data)
337{
338 struct super_block *s;
339 int err = sys_mount(name, "/root", fs, flags, data);
340 if (err)
341 return err;
342
343 sys_chdir("/root");
344 s = current->fs->pwd.dentry->d_sb;
345 ROOT_DEV = s->s_dev;
346 printk(KERN_INFO
347 "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
348 s->s_type->name,
349 s->s_flags & MS_RDONLY ? " readonly" : "",
350 MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
351 return 0;
352}
353
354void __init mount_block_root(char *name, int flags)
355{
356 char *fs_names = __getname_gfp(GFP_KERNEL
357 | __GFP_NOTRACK_FALSE_POSITIVE);
358 char *p;
359#ifdef CONFIG_BLOCK
360 char b[BDEVNAME_SIZE];
361#else
362 const char *b = name;
363#endif
364
365 get_fs_names(fs_names);
366retry:
367 for (p = fs_names; *p; p += strlen(p)+1) {
368 int err = do_mount_root(name, p, flags, root_mount_data);
369 switch (err) {
370 case 0:
371 goto out;
372 case -EACCES:
373 flags |= MS_RDONLY;
374 goto retry;
375 case -EINVAL:
376 continue;
377 }
378 /*
379 * Allow the user to distinguish between failed sys_open
380 * and bad superblock on root device.
381 * and give them a list of the available devices
382 */
383#ifdef CONFIG_BLOCK
384 __bdevname(ROOT_DEV, b);
385#endif
386 printk("VFS: Cannot open root device \"%s\" or %s: error %d\n",
387 root_device_name, b, err);
388 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
389
390 printk_all_partitions();
391#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
392 printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
393 "explicit textual name for \"root=\" boot option.\n");
394#endif
395 panic("VFS: Unable to mount root fs on %s", b);
396 }
397
398 printk("List of all partitions:\n");
399 printk_all_partitions();
400 printk("No filesystem could mount root, tried: ");
401 for (p = fs_names; *p; p += strlen(p)+1)
402 printk(" %s", p);
403 printk("\n");
404#ifdef CONFIG_BLOCK
405 __bdevname(ROOT_DEV, b);
406#endif
407 panic("VFS: Unable to mount root fs on %s", b);
408out:
409 putname(fs_names);
410}
411
412#ifdef CONFIG_ROOT_NFS
413
414#define NFSROOT_TIMEOUT_MIN 5
415#define NFSROOT_TIMEOUT_MAX 30
416#define NFSROOT_RETRY_MAX 5
417
418static int __init mount_nfs_root(void)
419{
420 char *root_dev, *root_data;
421 unsigned int timeout;
422 int try, err;
423
424 err = nfs_root_data(&root_dev, &root_data);
425 if (err != 0)
426 return 0;
427
428 /*
429 * The server or network may not be ready, so try several
430 * times. Stop after a few tries in case the client wants
431 * to fall back to other boot methods.
432 */
433 timeout = NFSROOT_TIMEOUT_MIN;
434 for (try = 1; ; try++) {
435 err = do_mount_root(root_dev, "nfs",
436 root_mountflags, root_data);
437 if (err == 0)
438 return 1;
439 if (try > NFSROOT_RETRY_MAX)
440 break;
441
442 /* Wait, in case the server refused us immediately */
443 ssleep(timeout);
444 timeout <<= 1;
445 if (timeout > NFSROOT_TIMEOUT_MAX)
446 timeout = NFSROOT_TIMEOUT_MAX;
447 }
448 return 0;
449}
450#endif
451
452#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
453void __init change_floppy(char *fmt, ...)
454{
455 struct termios termios;
456 char buf[80];
457 char c;
458 int fd;
459 va_list args;
460 va_start(args, fmt);
461 vsprintf(buf, fmt, args);
462 va_end(args);
463 fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
464 if (fd >= 0) {
465 sys_ioctl(fd, FDEJECT, 0);
466 sys_close(fd);
467 }
468 printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
469 fd = sys_open("/dev/console", O_RDWR, 0);
470 if (fd >= 0) {
471 sys_ioctl(fd, TCGETS, (long)&termios);
472 termios.c_lflag &= ~ICANON;
473 sys_ioctl(fd, TCSETSF, (long)&termios);
474 sys_read(fd, &c, 1);
475 termios.c_lflag |= ICANON;
476 sys_ioctl(fd, TCSETSF, (long)&termios);
477 sys_close(fd);
478 }
479}
480#endif
481
482void __init mount_root(void)
483{
484#ifdef CONFIG_ROOT_NFS
485 if (ROOT_DEV == Root_NFS) {
486 if (mount_nfs_root())
487 return;
488
489 printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
490 ROOT_DEV = Root_FD0;
491 }
492#endif
493#ifdef CONFIG_BLK_DEV_FD
494 if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
495 /* rd_doload is 2 for a dual initrd/ramload setup */
496 if (rd_doload==2) {
497 if (rd_load_disk(1)) {
498 ROOT_DEV = Root_RAM1;
499 root_device_name = NULL;
500 }
501 } else
502 change_floppy("root floppy");
503 }
504#endif
505#ifdef CONFIG_BLOCK
506 create_dev("/dev/root", ROOT_DEV);
507 mount_block_root("/dev/root", root_mountflags);
508#endif
509}
510
511/*
512 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
513 */
514void __init prepare_namespace(void)
515{
516 int is_floppy;
517
518 if (root_delay) {
519 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
520 root_delay);
521 ssleep(root_delay);
522 }
523
524 /*
525 * wait for the known devices to complete their probing
526 *
527 * Note: this is a potential source of long boot delays.
528 * For example, it is not atypical to wait 5 seconds here
529 * for the touchpad of a laptop to initialize.
530 */
531 wait_for_device_probe();
532
533 md_run_setup();
534
535 if (saved_root_name[0]) {
536 root_device_name = saved_root_name;
537 if (!strncmp(root_device_name, "mtd", 3) ||
538 !strncmp(root_device_name, "ubi", 3)) {
539 mount_block_root(root_device_name, root_mountflags);
540 goto out;
541 }
542 ROOT_DEV = name_to_dev_t(root_device_name);
543 if (strncmp(root_device_name, "/dev/", 5) == 0)
544 root_device_name += 5;
545 }
546
547 if (initrd_load())
548 goto out;
549
550 /* wait for any asynchronous scanning to complete */
551 if ((ROOT_DEV == 0) && root_wait) {
552 printk(KERN_INFO "Waiting for root device %s...\n",
553 saved_root_name);
554 while (driver_probe_done() != 0 ||
555 (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
556 msleep(100);
557 async_synchronize_full();
558 }
559
560 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
561
562 if (is_floppy && rd_doload && rd_load_disk(0))
563 ROOT_DEV = Root_RAM0;
564
565 mount_root();
566out:
567 devtmpfs_mount("dev");
568 sys_mount(".", "/", NULL, MS_MOVE, NULL);
569 sys_chroot(".");
570}