blob: 093f65915501bad5db5a8f9c348b5d62ad8a484c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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>
Dave Gilbertdd2a3452007-05-09 02:33:24 -070010#include <linux/genhd.h>
Andrew Mortond53d9f12005-07-12 13:58:07 -070011#include <linux/mount.h>
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -070012#include <linux/device.h>
Adrian Bunk46595392007-05-08 00:24:47 -070013#include <linux/init.h>
Adrian Bunk011e3fc2008-02-06 01:36:47 -080014#include <linux/fs.h>
Adrian Bunk82c82532008-07-25 01:45:29 -070015#include <linux/initrd.h>
Arjan van de Ven22a9d642009-01-07 08:45:46 -080016#include <linux/async.h>
Al Viro5ad4e532009-03-29 19:50:06 -040017#include <linux/fs_struct.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070025int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */
26
Theodore Ts'o9b04c992006-03-24 03:15:10 -080027int root_mountflags = MS_RDONLY | MS_SILENT;
Adrian Bunkf56f6d302008-07-25 19:46:25 -070028static char * __initdata root_device_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029static char __initdata saved_root_name[64];
Pierre Ossmancc1ed752007-07-15 23:40:35 -070030static int __initdata root_wait;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
Linus Torvalds1da177e2005-04-16 15:20:36 -070032dev_t ROOT_DEV;
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034static 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
41static int __init readonly(char *str)
42{
43 if (*str)
44 return 0;
45 root_mountflags |= MS_RDONLY;
46 return 1;
47}
48
49static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070060/*
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 *
Kay Sieversedfaa7c2007-05-21 22:08:01 +020071 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 */
76
77dev_t name_to_dev_t(char *name)
78{
79 char s[32];
80 char *p;
81 dev_t res = 0;
Kay Sievers30f2f0e2008-05-06 22:31:33 +020082 int part;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
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 }
Kay Sieversedfaa7c2007-05-21 22:08:01 +020098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 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 = '!';
Kay Sievers30f2f0e2008-05-06 22:31:33 +0200113 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 if (res)
139 goto done;
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141fail:
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200142 return 0;
143done:
144 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
147static 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
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700155static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165static char * __initdata root_mount_data;
166static int __init root_data_setup(char *str)
167{
168 root_mount_data = str;
169 return 1;
170}
171
172static char * __initdata root_fs_names;
173static int __init fs_names_setup(char *str)
174{
175 root_fs_names = str;
176 return 1;
177}
178
179static unsigned int __initdata root_delay;
180static 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
190static 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
217static 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");
Jan Blunck6ac08c32008-02-14 19:34:38 -0800224 ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
Marton Balintbca10332009-01-06 14:40:43 -0800225 printk("VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
Jan Blunck6ac08c32008-02-14 19:34:38 -0800226 current->fs->pwd.mnt->mnt_sb->s_type->name,
227 current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
Marton Balintbca10332009-01-06 14:40:43 -0800228 " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return 0;
230}
231
232void __init mount_block_root(char *name, int flags)
233{
Vegard Nossum3b5c7602009-05-16 11:26:20 +0200234 char *fs_names = __getname_gfp(GFP_KERNEL
235 | __GFP_NOTRACK_FALSE_POSITIVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 char *p;
David Howells93614012006-09-30 20:45:40 +0200237#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 char b[BDEVNAME_SIZE];
David Howells93614012006-09-30 20:45:40 +0200239#else
240 const char *b = name;
241#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243 get_fs_names(fs_names);
244retry:
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.
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700259 * and give them a list of the available devices
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 */
David Howells93614012006-09-30 20:45:40 +0200261#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 __bdevname(ROOT_DEV, b);
David Howells93614012006-09-30 20:45:40 +0200263#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 printk("VFS: Cannot open root device \"%s\" or %s\n",
265 root_device_name, b);
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700266 printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700268 printk_all_partitions();
Tejun Heo55dc7db2008-09-01 13:44:35 +0200269#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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 panic("VFS: Unable to mount root fs on %s", b);
274 }
Andy Whitcroftbe6e0282006-05-15 09:44:29 -0700275
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700276 printk("List of all partitions:\n");
277 printk_all_partitions();
Andy Whitcroftbe6e0282006-05-15 09:44:29 -0700278 printk("No filesystem could mount root, tried: ");
279 for (p = fs_names; *p; p += strlen(p)+1)
280 printk(" %s", p);
281 printk("\n");
David Howells93614012006-09-30 20:45:40 +0200282#ifdef CONFIG_BLOCK
283 __bdevname(ROOT_DEV, b);
284#endif
285 panic("VFS: Unable to mount root fs on %s", b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286out:
287 putname(fs_names);
288}
289
290#ifdef CONFIG_ROOT_NFS
291static int __init mount_nfs_root(void)
292{
293 void *data = nfs_root_data();
294
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700295 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 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)
304void __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
333void __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
David Howells93614012006-09-30 20:45:40 +0200356#ifdef CONFIG_BLOCK
Greg Kroah-Hartmanbdaf8522005-06-20 21:15:16 -0700357 create_dev("/dev/root", ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 mount_block_root("/dev/root", root_mountflags);
David Howells93614012006-09-30 20:45:40 +0200359#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360}
361
362/*
363 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
364 */
365void __init prepare_namespace(void)
366{
367 int is_floppy;
368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 if (root_delay) {
370 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
371 root_delay);
372 ssleep(root_delay);
373 }
374
Arjan van de Ven216773a2009-02-14 01:59:06 +0100375 /*
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();
Greg Kroah-Hartmand7792492006-07-18 10:59:59 -0700383
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 md_run_setup();
385
386 if (saved_root_name[0]) {
387 root_device_name = saved_root_name;
Adrian Hunter2d62f482008-01-31 17:25:00 +0200388 if (!strncmp(root_device_name, "mtd", 3) ||
389 !strncmp(root_device_name, "ubi", 3)) {
Joern Engele9482b42006-05-30 14:25:46 +0200390 mount_block_root(root_device_name, root_mountflags);
391 goto out;
392 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 if (initrd_load())
399 goto out;
400
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700401 /* 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);
Arjan van de Ven216773a2009-02-14 01:59:06 +0100408 async_synchronize_full();
Pierre Ossmancc1ed752007-07-15 23:40:35 -0700409 }
410
411 is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 if (is_floppy && rd_doload && rd_load_disk(0))
414 ROOT_DEV = Root_RAM0;
415
416 mount_root();
417out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 sys_mount(".", "/", NULL, MS_MOVE, NULL);
419 sys_chroot(".");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420}
421