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1 | // SPDX-License-Identifier: GPL-2.0-only | |
2 | #include <linux/module.h> | |
3 | #include <linux/sched.h> | |
4 | #include <linux/ctype.h> | |
5 | #include <linux/fd.h> | |
6 | #include <linux/tty.h> | |
7 | #include <linux/suspend.h> | |
8 | #include <linux/root_dev.h> | |
9 | #include <linux/security.h> | |
10 | #include <linux/delay.h> | |
11 | #include <linux/genhd.h> | |
12 | #include <linux/mount.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/initrd.h> | |
17 | #include <linux/async.h> | |
18 | #include <linux/fs_struct.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/ramfs.h> | |
21 | #include <linux/shmem_fs.h> | |
22 | ||
23 | #include <linux/nfs_fs.h> | |
24 | #include <linux/nfs_fs_sb.h> | |
25 | #include <linux/nfs_mount.h> | |
26 | #include <linux/raid/detect.h> | |
27 | #include <uapi/linux/mount.h> | |
28 | ||
29 | #include "do_mounts.h" | |
30 | ||
31 | int root_mountflags = MS_RDONLY | MS_SILENT; | |
32 | static char * __initdata root_device_name; | |
33 | static char __initdata saved_root_name[64]; | |
34 | static int root_wait; | |
35 | ||
36 | dev_t ROOT_DEV; | |
37 | ||
38 | static int __init load_ramdisk(char *str) | |
39 | { | |
40 | pr_warn("ignoring the deprecated load_ramdisk= option\n"); | |
41 | return 1; | |
42 | } | |
43 | __setup("load_ramdisk=", load_ramdisk); | |
44 | ||
45 | static int __init readonly(char *str) | |
46 | { | |
47 | if (*str) | |
48 | return 0; | |
49 | root_mountflags |= MS_RDONLY; | |
50 | return 1; | |
51 | } | |
52 | ||
53 | static int __init readwrite(char *str) | |
54 | { | |
55 | if (*str) | |
56 | return 0; | |
57 | root_mountflags &= ~MS_RDONLY; | |
58 | return 1; | |
59 | } | |
60 | ||
61 | __setup("ro", readonly); | |
62 | __setup("rw", readwrite); | |
63 | ||
64 | #ifdef CONFIG_BLOCK | |
65 | struct uuidcmp { | |
66 | const char *uuid; | |
67 | int len; | |
68 | }; | |
69 | ||
70 | /** | |
71 | * match_dev_by_uuid - callback for finding a partition using its uuid | |
72 | * @dev: device passed in by the caller | |
73 | * @data: opaque pointer to the desired struct uuidcmp to match | |
74 | * | |
75 | * Returns 1 if the device matches, and 0 otherwise. | |
76 | */ | |
77 | static int match_dev_by_uuid(struct device *dev, const void *data) | |
78 | { | |
79 | struct block_device *bdev = dev_to_bdev(dev); | |
80 | const struct uuidcmp *cmp = data; | |
81 | ||
82 | if (!bdev->bd_meta_info || | |
83 | strncasecmp(cmp->uuid, bdev->bd_meta_info->uuid, cmp->len)) | |
84 | return 0; | |
85 | return 1; | |
86 | } | |
87 | ||
88 | /** | |
89 | * devt_from_partuuid - looks up the dev_t of a partition by its UUID | |
90 | * @uuid_str: char array containing ascii UUID | |
91 | * | |
92 | * The function will return the first partition which contains a matching | |
93 | * UUID value in its partition_meta_info struct. This does not search | |
94 | * by filesystem UUIDs. | |
95 | * | |
96 | * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be | |
97 | * extracted and used as an offset from the partition identified by the UUID. | |
98 | * | |
99 | * Returns the matching dev_t on success or 0 on failure. | |
100 | */ | |
101 | static dev_t devt_from_partuuid(const char *uuid_str) | |
102 | { | |
103 | struct uuidcmp cmp; | |
104 | struct device *dev = NULL; | |
105 | dev_t devt = 0; | |
106 | int offset = 0; | |
107 | char *slash; | |
108 | ||
109 | cmp.uuid = uuid_str; | |
110 | ||
111 | slash = strchr(uuid_str, '/'); | |
112 | /* Check for optional partition number offset attributes. */ | |
113 | if (slash) { | |
114 | char c = 0; | |
115 | ||
116 | /* Explicitly fail on poor PARTUUID syntax. */ | |
117 | if (sscanf(slash + 1, "PARTNROFF=%d%c", &offset, &c) != 1) | |
118 | goto clear_root_wait; | |
119 | cmp.len = slash - uuid_str; | |
120 | } else { | |
121 | cmp.len = strlen(uuid_str); | |
122 | } | |
123 | ||
124 | if (!cmp.len) | |
125 | goto clear_root_wait; | |
126 | ||
127 | dev = class_find_device(&block_class, NULL, &cmp, &match_dev_by_uuid); | |
128 | if (!dev) | |
129 | return 0; | |
130 | ||
131 | if (offset) { | |
132 | /* | |
133 | * Attempt to find the requested partition by adding an offset | |
134 | * to the partition number found by UUID. | |
135 | */ | |
136 | struct block_device *part; | |
137 | ||
138 | part = bdget_disk(dev_to_disk(dev), | |
139 | dev_to_bdev(dev)->bd_partno + offset); | |
140 | if (part) { | |
141 | devt = part->bd_dev; | |
142 | bdput(part); | |
143 | } | |
144 | } else { | |
145 | devt = dev->devt; | |
146 | } | |
147 | ||
148 | put_device(dev); | |
149 | return devt; | |
150 | ||
151 | clear_root_wait: | |
152 | pr_err("VFS: PARTUUID= is invalid.\n" | |
153 | "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); | |
154 | if (root_wait) | |
155 | pr_err("Disabling rootwait; root= is invalid.\n"); | |
156 | root_wait = 0; | |
157 | return 0; | |
158 | } | |
159 | ||
160 | /** | |
161 | * match_dev_by_label - callback for finding a partition using its label | |
162 | * @dev: device passed in by the caller | |
163 | * @data: opaque pointer to the label to match | |
164 | * | |
165 | * Returns 1 if the device matches, and 0 otherwise. | |
166 | */ | |
167 | static int match_dev_by_label(struct device *dev, const void *data) | |
168 | { | |
169 | struct block_device *bdev = dev_to_bdev(dev); | |
170 | const char *label = data; | |
171 | ||
172 | if (!bdev->bd_meta_info || strcmp(label, bdev->bd_meta_info->volname)) | |
173 | return 0; | |
174 | return 1; | |
175 | } | |
176 | ||
177 | static dev_t devt_from_partlabel(const char *label) | |
178 | { | |
179 | struct device *dev; | |
180 | dev_t devt = 0; | |
181 | ||
182 | dev = class_find_device(&block_class, NULL, label, &match_dev_by_label); | |
183 | if (dev) { | |
184 | devt = dev->devt; | |
185 | put_device(dev); | |
186 | } | |
187 | ||
188 | return devt; | |
189 | } | |
190 | ||
191 | static dev_t devt_from_devname(const char *name) | |
192 | { | |
193 | dev_t devt = 0; | |
194 | int part; | |
195 | char s[32]; | |
196 | char *p; | |
197 | ||
198 | if (strlen(name) > 31) | |
199 | return 0; | |
200 | strcpy(s, name); | |
201 | for (p = s; *p; p++) { | |
202 | if (*p == '/') | |
203 | *p = '!'; | |
204 | } | |
205 | ||
206 | devt = blk_lookup_devt(s, 0); | |
207 | if (devt) | |
208 | return devt; | |
209 | ||
210 | /* | |
211 | * Try non-existent, but valid partition, which may only exist after | |
212 | * opening the device, like partitioned md devices. | |
213 | */ | |
214 | while (p > s && isdigit(p[-1])) | |
215 | p--; | |
216 | if (p == s || !*p || *p == '0') | |
217 | return 0; | |
218 | ||
219 | /* try disk name without <part number> */ | |
220 | part = simple_strtoul(p, NULL, 10); | |
221 | *p = '\0'; | |
222 | devt = blk_lookup_devt(s, part); | |
223 | if (devt) | |
224 | return devt; | |
225 | ||
226 | /* try disk name without p<part number> */ | |
227 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') | |
228 | return 0; | |
229 | p[-1] = '\0'; | |
230 | return blk_lookup_devt(s, part); | |
231 | } | |
232 | #endif /* CONFIG_BLOCK */ | |
233 | ||
234 | static dev_t devt_from_devnum(const char *name) | |
235 | { | |
236 | unsigned maj, min, offset; | |
237 | dev_t devt = 0; | |
238 | char *p, dummy; | |
239 | ||
240 | if (sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2 || | |
241 | sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3) { | |
242 | devt = MKDEV(maj, min); | |
243 | if (maj != MAJOR(devt) || min != MINOR(devt)) | |
244 | return 0; | |
245 | } else { | |
246 | devt = new_decode_dev(simple_strtoul(name, &p, 16)); | |
247 | if (*p) | |
248 | return 0; | |
249 | } | |
250 | ||
251 | return devt; | |
252 | } | |
253 | ||
254 | /* | |
255 | * Convert a name into device number. We accept the following variants: | |
256 | * | |
257 | * 1) <hex_major><hex_minor> device number in hexadecimal represents itself | |
258 | * no leading 0x, for example b302. | |
259 | * 2) /dev/nfs represents Root_NFS (0xff) | |
260 | * 3) /dev/<disk_name> represents the device number of disk | |
261 | * 4) /dev/<disk_name><decimal> represents the device number | |
262 | * of partition - device number of disk plus the partition number | |
263 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is | |
264 | * used when disk name of partitioned disk ends on a digit. | |
265 | * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the | |
266 | * unique id of a partition if the partition table provides it. | |
267 | * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS | |
268 | * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- | |
269 | * filled hex representation of the 32-bit "NT disk signature", and PP | |
270 | * is a zero-filled hex representation of the 1-based partition number. | |
271 | * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to | |
272 | * a partition with a known unique id. | |
273 | * 8) <major>:<minor> major and minor number of the device separated by | |
274 | * a colon. | |
275 | * 9) PARTLABEL=<name> with name being the GPT partition label. | |
276 | * MSDOS partitions do not support labels! | |
277 | * 10) /dev/cifs represents Root_CIFS (0xfe) | |
278 | * | |
279 | * If name doesn't have fall into the categories above, we return (0,0). | |
280 | * block_class is used to check if something is a disk name. If the disk | |
281 | * name contains slashes, the device name has them replaced with | |
282 | * bangs. | |
283 | */ | |
284 | dev_t name_to_dev_t(const char *name) | |
285 | { | |
286 | if (strcmp(name, "/dev/nfs") == 0) | |
287 | return Root_NFS; | |
288 | if (strcmp(name, "/dev/cifs") == 0) | |
289 | return Root_CIFS; | |
290 | if (strcmp(name, "/dev/ram") == 0) | |
291 | return Root_RAM0; | |
292 | #ifdef CONFIG_BLOCK | |
293 | if (strncmp(name, "PARTUUID=", 9) == 0) | |
294 | return devt_from_partuuid(name + 9); | |
295 | if (strncmp(name, "PARTLABEL=", 10) == 0) | |
296 | return devt_from_partlabel(name + 10); | |
297 | if (strncmp(name, "/dev/", 5) == 0) | |
298 | return devt_from_devname(name + 5); | |
299 | #endif | |
300 | return devt_from_devnum(name); | |
301 | } | |
302 | EXPORT_SYMBOL_GPL(name_to_dev_t); | |
303 | ||
304 | static int __init root_dev_setup(char *line) | |
305 | { | |
306 | strlcpy(saved_root_name, line, sizeof(saved_root_name)); | |
307 | return 1; | |
308 | } | |
309 | ||
310 | __setup("root=", root_dev_setup); | |
311 | ||
312 | static int __init rootwait_setup(char *str) | |
313 | { | |
314 | if (*str) | |
315 | return 0; | |
316 | root_wait = 1; | |
317 | return 1; | |
318 | } | |
319 | ||
320 | __setup("rootwait", rootwait_setup); | |
321 | ||
322 | static char * __initdata root_mount_data; | |
323 | static int __init root_data_setup(char *str) | |
324 | { | |
325 | root_mount_data = str; | |
326 | return 1; | |
327 | } | |
328 | ||
329 | static char * __initdata root_fs_names; | |
330 | static int __init fs_names_setup(char *str) | |
331 | { | |
332 | root_fs_names = str; | |
333 | return 1; | |
334 | } | |
335 | ||
336 | static unsigned int __initdata root_delay; | |
337 | static int __init root_delay_setup(char *str) | |
338 | { | |
339 | root_delay = simple_strtoul(str, NULL, 0); | |
340 | return 1; | |
341 | } | |
342 | ||
343 | __setup("rootflags=", root_data_setup); | |
344 | __setup("rootfstype=", fs_names_setup); | |
345 | __setup("rootdelay=", root_delay_setup); | |
346 | ||
347 | static void __init get_fs_names(char *page) | |
348 | { | |
349 | char *s = page; | |
350 | ||
351 | if (root_fs_names) { | |
352 | strcpy(page, root_fs_names); | |
353 | while (*s++) { | |
354 | if (s[-1] == ',') | |
355 | s[-1] = '\0'; | |
356 | } | |
357 | } else { | |
358 | int len = get_filesystem_list(page); | |
359 | char *p, *next; | |
360 | ||
361 | page[len] = '\0'; | |
362 | for (p = page-1; p; p = next) { | |
363 | next = strchr(++p, '\n'); | |
364 | if (*p++ != '\t') | |
365 | continue; | |
366 | while ((*s++ = *p++) != '\n') | |
367 | ; | |
368 | s[-1] = '\0'; | |
369 | } | |
370 | } | |
371 | *s = '\0'; | |
372 | } | |
373 | ||
374 | static int __init do_mount_root(const char *name, const char *fs, | |
375 | const int flags, const void *data) | |
376 | { | |
377 | struct super_block *s; | |
378 | struct page *p = NULL; | |
379 | char *data_page = NULL; | |
380 | int ret; | |
381 | ||
382 | if (data) { | |
383 | /* init_mount() requires a full page as fifth argument */ | |
384 | p = alloc_page(GFP_KERNEL); | |
385 | if (!p) | |
386 | return -ENOMEM; | |
387 | data_page = page_address(p); | |
388 | /* zero-pad. init_mount() will make sure it's terminated */ | |
389 | strncpy(data_page, data, PAGE_SIZE); | |
390 | } | |
391 | ||
392 | ret = init_mount(name, "/root", fs, flags, data_page); | |
393 | if (ret) | |
394 | goto out; | |
395 | ||
396 | init_chdir("/root"); | |
397 | s = current->fs->pwd.dentry->d_sb; | |
398 | ROOT_DEV = s->s_dev; | |
399 | printk(KERN_INFO | |
400 | "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", | |
401 | s->s_type->name, | |
402 | sb_rdonly(s) ? " readonly" : "", | |
403 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); | |
404 | ||
405 | out: | |
406 | if (p) | |
407 | put_page(p); | |
408 | return ret; | |
409 | } | |
410 | ||
411 | void __init mount_block_root(char *name, int flags) | |
412 | { | |
413 | struct page *page = alloc_page(GFP_KERNEL); | |
414 | char *fs_names = page_address(page); | |
415 | char *p; | |
416 | char b[BDEVNAME_SIZE]; | |
417 | ||
418 | scnprintf(b, BDEVNAME_SIZE, "unknown-block(%u,%u)", | |
419 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); | |
420 | get_fs_names(fs_names); | |
421 | retry: | |
422 | for (p = fs_names; *p; p += strlen(p)+1) { | |
423 | int err = do_mount_root(name, p, flags, root_mount_data); | |
424 | switch (err) { | |
425 | case 0: | |
426 | goto out; | |
427 | case -EACCES: | |
428 | case -EINVAL: | |
429 | continue; | |
430 | } | |
431 | /* | |
432 | * Allow the user to distinguish between failed sys_open | |
433 | * and bad superblock on root device. | |
434 | * and give them a list of the available devices | |
435 | */ | |
436 | printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", | |
437 | root_device_name, b, err); | |
438 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); | |
439 | ||
440 | printk_all_partitions(); | |
441 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT | |
442 | printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " | |
443 | "explicit textual name for \"root=\" boot option.\n"); | |
444 | #endif | |
445 | panic("VFS: Unable to mount root fs on %s", b); | |
446 | } | |
447 | if (!(flags & SB_RDONLY)) { | |
448 | flags |= SB_RDONLY; | |
449 | goto retry; | |
450 | } | |
451 | ||
452 | printk("List of all partitions:\n"); | |
453 | printk_all_partitions(); | |
454 | printk("No filesystem could mount root, tried: "); | |
455 | for (p = fs_names; *p; p += strlen(p)+1) | |
456 | printk(" %s", p); | |
457 | printk("\n"); | |
458 | panic("VFS: Unable to mount root fs on %s", b); | |
459 | out: | |
460 | put_page(page); | |
461 | } | |
462 | ||
463 | #ifdef CONFIG_ROOT_NFS | |
464 | ||
465 | #define NFSROOT_TIMEOUT_MIN 5 | |
466 | #define NFSROOT_TIMEOUT_MAX 30 | |
467 | #define NFSROOT_RETRY_MAX 5 | |
468 | ||
469 | static int __init mount_nfs_root(void) | |
470 | { | |
471 | char *root_dev, *root_data; | |
472 | unsigned int timeout; | |
473 | int try, err; | |
474 | ||
475 | err = nfs_root_data(&root_dev, &root_data); | |
476 | if (err != 0) | |
477 | return 0; | |
478 | ||
479 | /* | |
480 | * The server or network may not be ready, so try several | |
481 | * times. Stop after a few tries in case the client wants | |
482 | * to fall back to other boot methods. | |
483 | */ | |
484 | timeout = NFSROOT_TIMEOUT_MIN; | |
485 | for (try = 1; ; try++) { | |
486 | err = do_mount_root(root_dev, "nfs", | |
487 | root_mountflags, root_data); | |
488 | if (err == 0) | |
489 | return 1; | |
490 | if (try > NFSROOT_RETRY_MAX) | |
491 | break; | |
492 | ||
493 | /* Wait, in case the server refused us immediately */ | |
494 | ssleep(timeout); | |
495 | timeout <<= 1; | |
496 | if (timeout > NFSROOT_TIMEOUT_MAX) | |
497 | timeout = NFSROOT_TIMEOUT_MAX; | |
498 | } | |
499 | return 0; | |
500 | } | |
501 | #endif | |
502 | ||
503 | #ifdef CONFIG_CIFS_ROOT | |
504 | ||
505 | extern int cifs_root_data(char **dev, char **opts); | |
506 | ||
507 | #define CIFSROOT_TIMEOUT_MIN 5 | |
508 | #define CIFSROOT_TIMEOUT_MAX 30 | |
509 | #define CIFSROOT_RETRY_MAX 5 | |
510 | ||
511 | static int __init mount_cifs_root(void) | |
512 | { | |
513 | char *root_dev, *root_data; | |
514 | unsigned int timeout; | |
515 | int try, err; | |
516 | ||
517 | err = cifs_root_data(&root_dev, &root_data); | |
518 | if (err != 0) | |
519 | return 0; | |
520 | ||
521 | timeout = CIFSROOT_TIMEOUT_MIN; | |
522 | for (try = 1; ; try++) { | |
523 | err = do_mount_root(root_dev, "cifs", root_mountflags, | |
524 | root_data); | |
525 | if (err == 0) | |
526 | return 1; | |
527 | if (try > CIFSROOT_RETRY_MAX) | |
528 | break; | |
529 | ||
530 | ssleep(timeout); | |
531 | timeout <<= 1; | |
532 | if (timeout > CIFSROOT_TIMEOUT_MAX) | |
533 | timeout = CIFSROOT_TIMEOUT_MAX; | |
534 | } | |
535 | return 0; | |
536 | } | |
537 | #endif | |
538 | ||
539 | void __init mount_root(void) | |
540 | { | |
541 | #ifdef CONFIG_ROOT_NFS | |
542 | if (ROOT_DEV == Root_NFS) { | |
543 | if (!mount_nfs_root()) | |
544 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS.\n"); | |
545 | return; | |
546 | } | |
547 | #endif | |
548 | #ifdef CONFIG_CIFS_ROOT | |
549 | if (ROOT_DEV == Root_CIFS) { | |
550 | if (!mount_cifs_root()) | |
551 | printk(KERN_ERR "VFS: Unable to mount root fs via SMB.\n"); | |
552 | return; | |
553 | } | |
554 | #endif | |
555 | #ifdef CONFIG_BLOCK | |
556 | { | |
557 | int err = create_dev("/dev/root", ROOT_DEV); | |
558 | ||
559 | if (err < 0) | |
560 | pr_emerg("Failed to create /dev/root: %d\n", err); | |
561 | mount_block_root("/dev/root", root_mountflags); | |
562 | } | |
563 | #endif | |
564 | } | |
565 | ||
566 | /* | |
567 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. | |
568 | */ | |
569 | void __init prepare_namespace(void) | |
570 | { | |
571 | if (root_delay) { | |
572 | printk(KERN_INFO "Waiting %d sec before mounting root device...\n", | |
573 | root_delay); | |
574 | ssleep(root_delay); | |
575 | } | |
576 | ||
577 | /* | |
578 | * wait for the known devices to complete their probing | |
579 | * | |
580 | * Note: this is a potential source of long boot delays. | |
581 | * For example, it is not atypical to wait 5 seconds here | |
582 | * for the touchpad of a laptop to initialize. | |
583 | */ | |
584 | wait_for_device_probe(); | |
585 | ||
586 | md_run_setup(); | |
587 | ||
588 | if (saved_root_name[0]) { | |
589 | root_device_name = saved_root_name; | |
590 | if (!strncmp(root_device_name, "mtd", 3) || | |
591 | !strncmp(root_device_name, "ubi", 3)) { | |
592 | mount_block_root(root_device_name, root_mountflags); | |
593 | goto out; | |
594 | } | |
595 | ROOT_DEV = name_to_dev_t(root_device_name); | |
596 | if (strncmp(root_device_name, "/dev/", 5) == 0) | |
597 | root_device_name += 5; | |
598 | } | |
599 | ||
600 | if (initrd_load()) | |
601 | goto out; | |
602 | ||
603 | /* wait for any asynchronous scanning to complete */ | |
604 | if ((ROOT_DEV == 0) && root_wait) { | |
605 | printk(KERN_INFO "Waiting for root device %s...\n", | |
606 | saved_root_name); | |
607 | while (driver_probe_done() != 0 || | |
608 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) | |
609 | msleep(5); | |
610 | async_synchronize_full(); | |
611 | } | |
612 | ||
613 | mount_root(); | |
614 | out: | |
615 | devtmpfs_mount(); | |
616 | init_mount(".", "/", NULL, MS_MOVE, NULL); | |
617 | init_chroot("."); | |
618 | } | |
619 | ||
620 | static bool is_tmpfs; | |
621 | static int rootfs_init_fs_context(struct fs_context *fc) | |
622 | { | |
623 | if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) | |
624 | return shmem_init_fs_context(fc); | |
625 | ||
626 | return ramfs_init_fs_context(fc); | |
627 | } | |
628 | ||
629 | struct file_system_type rootfs_fs_type = { | |
630 | .name = "rootfs", | |
631 | .init_fs_context = rootfs_init_fs_context, | |
632 | .kill_sb = kill_litter_super, | |
633 | }; | |
634 | ||
635 | void __init init_rootfs(void) | |
636 | { | |
637 | if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && | |
638 | (!root_fs_names || strstr(root_fs_names, "tmpfs"))) | |
639 | is_tmpfs = true; | |
640 | } |