ubox fix extroot delay
[project/ubox.git] / block.c
1 /*
2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU Lesser General Public License version 2.1
7  * as published by the Free Software Foundation
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  */
14
15 #include <stdio.h>
16 #include <unistd.h>
17 #include <syslog.h>
18 #include <libgen.h>
19 #include <glob.h>
20
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <sys/swap.h>
24 #include <sys/mount.h>
25 #include <sys/wait.h>
26
27 #include <uci.h>
28 #include <uci_blob.h>
29
30 #include <libubox/list.h>
31 #include <libubox/vlist.h>
32 #include <libubox/blobmsg_json.h>
33 #include <libubox/avl-cmp.h>
34
35 #include "libblkid-tiny/libblkid-tiny.h"
36
37 enum {
38         TYPE_MOUNT,
39         TYPE_SWAP,
40 };
41
42 struct mount {
43         struct vlist_node node;
44         int type;
45
46         char *target;
47         char *path;
48         char *options;
49         char *uuid;
50         char *label;
51         char *device;
52         int extroot;
53         int overlay;
54         int disabled_fsck;
55         unsigned int prio;
56 };
57
58 static struct vlist_tree mounts;
59 static struct blob_buf b;
60 static LIST_HEAD(devices);
61 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
62 static unsigned int delay_root;
63
64 enum {
65         CFG_ANON_MOUNT,
66         CFG_ANON_SWAP,
67         CFG_AUTO_MOUNT,
68         CFG_AUTO_SWAP,
69         CFG_DELAY_ROOT,
70         CFG_CHECK_FS,
71         __CFG_MAX
72 };
73
74 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
75         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
76         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
77         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
78         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
79         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
80         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
81 };
82
83 enum {
84         MOUNT_UUID,
85         MOUNT_LABEL,
86         MOUNT_ENABLE,
87         MOUNT_TARGET,
88         MOUNT_DEVICE,
89         MOUNT_OPTIONS,
90         __MOUNT_MAX
91 };
92
93 static const struct uci_blob_param_list config_attr_list = {
94         .n_params = __CFG_MAX,
95         .params = config_policy,
96 };
97
98 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
99         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
100         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
101         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
102         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
103         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
104         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
105 };
106
107 static const struct uci_blob_param_list mount_attr_list = {
108         .n_params = __MOUNT_MAX,
109         .params = mount_policy,
110 };
111
112 enum {
113         SWAP_ENABLE,
114         SWAP_UUID,
115         SWAP_DEVICE,
116         SWAP_PRIO,
117         __SWAP_MAX
118 };
119
120 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
121         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
122         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
123         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
124         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
125 };
126
127 static const struct uci_blob_param_list swap_attr_list = {
128         .n_params = __SWAP_MAX,
129         .params = swap_policy,
130 };
131
132 static char *blobmsg_get_strdup(struct blob_attr *attr)
133 {
134         if (!attr)
135                 return NULL;
136
137         return strdup(blobmsg_get_string(attr));
138 }
139
140 static char *blobmsg_get_basename(struct blob_attr *attr)
141 {
142         if (!attr)
143                 return NULL;
144
145         return strdup(basename(blobmsg_get_string(attr)));
146 }
147
148 static int mount_add(struct uci_section *s)
149 {
150         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
151         struct mount *m;
152
153         blob_buf_init(&b, 0);
154         uci_to_blob(&b, s, &mount_attr_list);
155         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
156
157         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
158                 return -1;
159
160         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
161                 return -1;
162
163         m = malloc(sizeof(struct mount));
164         m->type = TYPE_MOUNT;
165         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
166         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
167         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
168         m->options = blobmsg_get_strdup(tb[MOUNT_OPTIONS]);
169         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
170         m->overlay = m->extroot = 0;
171         if (m->target && !strcmp(m->target, "/"))
172                 m->extroot = 1;
173         if (m->target && !strcmp(m->target, "/overlay"))
174                 m->extroot = m->overlay = 1;
175
176         if (m->uuid)
177                 vlist_add(&mounts, &m->node, m->uuid);
178         else if (m->label)
179                 vlist_add(&mounts, &m->node, m->label);
180         else if (m->device)
181                 vlist_add(&mounts, &m->node, m->device);
182
183         return 0;
184 }
185
186 static int swap_add(struct uci_section *s)
187 {
188         struct blob_attr *tb[__SWAP_MAX] = { 0 };
189         struct mount *m;
190
191         blob_buf_init(&b, 0);
192         uci_to_blob(&b, s, &swap_attr_list);
193         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
194
195         if (!tb[SWAP_UUID] && !tb[SWAP_DEVICE])
196                 return -1;
197
198         m = malloc(sizeof(struct mount));
199         memset(m, 0, sizeof(struct mount));
200         m->type = TYPE_SWAP;
201         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
202         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
203         if (tb[SWAP_PRIO])
204                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
205         if (m->prio)
206                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
207
208         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE]))
209                 vlist_add(&mounts, &m->node, (m->uuid) ? (m->uuid) : (m->device));
210
211         return 0;
212 }
213
214 static int global_add(struct uci_section *s)
215 {
216         struct blob_attr *tb[__CFG_MAX] = { 0 };
217
218         blob_buf_init(&b, 0);
219         uci_to_blob(&b, s, &config_attr_list);
220         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
221
222         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
223                 anon_mount = 1;
224         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
225                 anon_swap = 1;
226
227         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
228                 auto_mount = 1;
229         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
230                 auto_swap = 1;
231
232         if (tb[CFG_DELAY_ROOT])
233                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
234
235         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
236                 check_fs = 1;
237
238         return 0;
239 }
240
241 static struct mount* find_swap(const char *uuid, const char *device)
242 {
243         struct mount *m;
244
245         vlist_for_each_element(&mounts, m, node) {
246                 if (m->type != TYPE_SWAP)
247                         continue;
248                 if (uuid && m->uuid && !strcmp(m->uuid, uuid))
249                         return m;
250                 if (device && m->device && !strcmp(m->device, device))
251                         return m;
252         }
253
254         return NULL;
255 }
256
257 static struct mount* find_block(const char *uuid, const char *label, const char *device,
258                                 const char *target)
259 {
260         struct mount *m;
261
262         vlist_for_each_element(&mounts, m, node) {
263                 if (m->type != TYPE_MOUNT)
264                         continue;
265                 if (m->uuid && uuid && !strcmp(m->uuid, uuid))
266                         return m;
267                 if (m->label && label && !strcmp(m->label, label))
268                         return m;
269                 if (m->target && target && !strcmp(m->target, target))
270                         return m;
271                 if (m->device && device && !strcmp(m->device, device))
272                         return m;
273         }
274
275         return NULL;
276 }
277
278 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
279                           struct vlist_node *node_old)
280 {
281 }
282
283 static int config_load(char *cfg)
284 {
285         struct uci_context *ctx;
286         struct uci_package *pkg;
287         struct uci_element *e;
288
289         vlist_init(&mounts, avl_strcmp, mounts_update);
290
291         ctx = uci_alloc_context();
292         if (cfg) {
293                 char path[32];
294                 snprintf(path, 32, "%s/etc/config", cfg);
295                 uci_set_confdir(ctx, path);
296         }
297
298         if (uci_load(ctx, "fstab", &pkg))
299                 return -1;
300
301         vlist_update(&mounts);
302         uci_foreach_element(&pkg->sections, e) {
303                 struct uci_section *s = uci_to_section(e);
304
305                 if (!strcmp(s->type, "mount"))
306                         mount_add(s);
307                 if (!strcmp(s->type, "swap"))
308                         swap_add(s);
309                 if (!strcmp(s->type, "global"))
310                         global_add(s);
311         }
312         vlist_flush(&mounts);
313
314         return 0;
315 }
316
317 static int _cache_load(const char *path)
318 {
319         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
320         int j;
321         glob_t gl;
322
323         if (glob(path, gl_flags, NULL, &gl) < 0)
324                 return -1;
325
326         for (j = 0; j < gl.gl_pathc; j++) {
327                 struct blkid_struct_probe *pr = malloc(sizeof(struct blkid_struct_probe));
328                 memset(pr, 0, sizeof(struct blkid_struct_probe));
329                 probe_block(gl.gl_pathv[j], pr);
330                 if (pr->err)
331                         free(pr);
332                 else
333                         list_add_tail(&pr->list, &devices);
334         }
335
336         globfree(&gl);
337
338         return 0;
339 }
340
341 static void cache_load(int mtd)
342 {
343         if (mtd)
344                 _cache_load("/dev/mtdblock*");
345         _cache_load("/dev/mmcblk*");
346         _cache_load("/dev/sd*");
347 }
348
349 static int print_block_info(struct blkid_struct_probe *pr)
350 {
351         printf("%s:", pr->dev);
352         if (pr->uuid[0])
353                 printf(" UUID=\"%s\"", pr->uuid);
354
355         if (pr->label[0])
356                 printf(" LABEL=\"%s\"", pr->label);
357
358         if (pr->name[0])
359                 printf(" NAME=\"%s\"", pr->name);
360
361         if (pr->version[0])
362                 printf(" VERSION=\"%s\"", pr->version);
363
364         printf(" TYPE=\"%s\"\n", pr->id->name);
365
366         return 0;
367 }
368
369 static int print_block_uci(struct blkid_struct_probe *pr)
370 {
371         if (!strcmp(pr->id->name, "swap")) {
372                 printf("config 'swap'\n");
373         } else {
374                 printf("config 'mount'\n");
375                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
376         }
377         if (pr->uuid[0])
378                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
379         else
380                 printf("\toption\tdevice\t'%s'\n", basename(pr->dev));
381         printf("\toption\tenabled\t'0'\n\n");
382
383         return 0;
384 }
385
386 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
387 {
388         struct blkid_struct_probe *pr = NULL;
389
390         if (uuid)
391                 list_for_each_entry(pr, &devices, list)
392                         if (!strcmp(pr->uuid, uuid))
393                                 return pr;
394
395         if (label)
396                 list_for_each_entry(pr, &devices, list)
397                         if (strcmp(pr->label, label))
398                                 return pr;
399
400         if (path)
401                 list_for_each_entry(pr, &devices, list)
402                         if (!strcmp(pr->dev, path))
403                                 return pr;
404
405         return NULL;
406 }
407
408 static char* find_mount_point(char *block)
409 {
410         FILE *fp = fopen("/proc/mounts", "r");
411         static char line[256];
412         int len = strlen(block);
413         char *point = NULL;
414
415         if(!fp)
416                 return NULL;
417
418         while (fgets(line, sizeof(line), fp)) {
419                 if (!strncmp(line, block, len)) {
420                         char *p = &line[len + 1];
421                         char *t = strstr(p, " ");
422
423                         if (!t)
424                                 return NULL;
425                         *t = '\0';
426                         point = p;
427                         break;
428                 }
429         }
430
431         fclose(fp);
432
433         return point;
434 }
435
436 static void mkdir_p(char *dir)
437 {
438         char *l = strrchr(dir, '/');
439
440         if (l) {
441                 *l = '\0';
442                 mkdir_p(dir);
443                 *l = '/';
444                 mkdir(dir, 0755);
445         }
446 }
447
448 static void check_filesystem(struct blkid_struct_probe *pr)
449 {
450         pid_t pid;
451         struct stat statbuf;
452         char *e2fsck = "/usr/sbin/e2fsck";
453
454         if (strncmp(pr->id->name, "ext", 3)) {
455                 fprintf(stderr, "check_filesystem: %s is not supported\n", pr->id->name);
456                 return;
457         }
458
459         if (stat(e2fsck, &statbuf) < 0) {
460                 fprintf(stderr, "check_filesystem: %s not found\n", e2fsck);
461                 return;
462         }
463
464         pid = fork();
465         if (!pid) {
466                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
467                 exit(-1);
468         } else if (pid > 0) {
469                 int status;
470
471                 waitpid(pid, &status, 0);
472                 if (WEXITSTATUS(status))
473                         fprintf(stderr, "check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
474         }
475 }
476
477 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
478 {
479         struct mount *m;
480         char *device = basename(pr->dev);
481
482         if (!pr)
483                 return -1;
484
485         if (!strcmp(pr->id->name, "swap")) {
486                 if (hotplug && !auto_swap)
487                         return -1;
488                 m = find_swap(pr->uuid, device);
489                 if (m || anon_swap)
490                         swapon(pr->dev, (m) ? (m->prio) : (0));
491
492                 return 0;
493         }
494
495         if (hotplug && !auto_mount)
496                 return -1;
497
498         if (find_mount_point(pr->dev)) {
499                 fprintf(stderr, "%s is already mounted\n", pr->dev);
500                 return -1;
501         }
502
503         m = find_block(pr->uuid, pr->label, device, NULL);
504         if (m && m->extroot)
505                 return -1;
506
507         if (m) {
508                 char *target = m->target;
509                 char _target[] = "/mnt/mmcblk123";
510                 int err = 0;
511
512                 if (!target) {
513                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
514                         target = _target;
515                 }
516                 mkdir_p(target);
517
518                 if (check_fs)
519                         check_filesystem(pr);
520
521                 err = mount(pr->dev, target, pr->id->name, 0, (m->options) ? (m->options) : (""));
522                 if (err)
523                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
524                                         pr->dev, pr->id->name, target, err, strerror(err));
525                 return err;
526         }
527
528         if (anon_mount) {
529                 char target[] = "/mnt/mmcblk123";
530                 int err = 0;
531
532                 snprintf(target, sizeof(target), "/mnt/%s", device);
533                 mkdir_p(target);
534
535                 if (check_fs)
536                         check_filesystem(pr);
537
538                 err = mount(pr->dev, target, pr->id->name, 0, "");
539                 if (err)
540                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
541                                         pr->dev, pr->id->name, target, err, strerror(err));
542                 return err;
543         }
544
545         return 0;
546 }
547
548 static int umount_device(struct blkid_struct_probe *pr)
549 {
550         struct mount *m;
551         char *device = basename(pr->dev);
552         char *mp;
553         int err;
554
555         if (!pr)
556                 return -1;
557
558         if (!strcmp(pr->id->name, "swap"))
559                 return -1;
560
561         mp = find_mount_point(pr->dev);
562         if (!mp)
563                 return -1;
564
565         m = find_block(pr->uuid, pr->label, device, NULL);
566         if (m && m->extroot)
567                 return -1;
568
569         err = umount2(mp, MNT_DETACH);
570         if (err)
571                 fprintf(stderr, "unmounting %s (%s)  failed (%d) - %s\n",
572                         pr->dev, mp, err, strerror(err));
573         else
574                 fprintf(stderr, "unmounted %s (%s)\n",
575                         pr->dev, mp);
576
577         return err;
578 }
579
580 static int main_hotplug(int argc, char **argv)
581 {
582         char path[32];
583         char *action, *device, *mount_point;
584
585         action = getenv("ACTION");
586         device = getenv("DEVNAME");
587
588         if (!action || !device)
589                 return -1;
590         snprintf(path, sizeof(path), "/dev/%s", device);
591
592         if (!strcmp(action, "remove")) {
593                 int err = 0;
594                 mount_point = find_mount_point(path);
595                 if (mount_point)
596                         err = umount2(mount_point, MNT_DETACH);
597
598                 if (err)
599                         fprintf(stderr, "umount of %s failed (%d) - %s\n",
600                                         mount_point, err, strerror(err));
601
602                 return 0;
603         } else if (strcmp(action, "add")) {
604                 fprintf(stderr, "Unkown action %s\n", action);
605
606                 return -1;
607         }
608
609         if (config_load(NULL))
610                 return -1;
611         cache_load(0);
612
613         return mount_device(find_block_info(NULL, NULL, path), 1);
614 }
615
616 static int find_block_mtd(char *name, char *part, int plen)
617 {
618         FILE *fp = fopen("/proc/mtd", "r");
619         static char line[256];
620         char *index = NULL;
621
622         if(!fp)
623                 return -1;
624
625         while (!index && fgets(line, sizeof(line), fp)) {
626                 if (strstr(line, name)) {
627                         char *eol = strstr(line, ":");
628
629                         if (!eol)
630                                 continue;
631
632                         *eol = '\0';
633                         index = &line[3];
634                 }
635         }
636
637         fclose(fp);
638
639         if (!index)
640                 return -1;
641
642         snprintf(part, plen, "/dev/mtdblock%s", index);
643
644         return 0;
645 }
646
647 static int check_extroot(char *path)
648 {
649         struct blkid_struct_probe *pr = NULL;
650         char fs[32];
651
652         if (find_block_mtd("rootfs", fs, sizeof(fs)))
653                 return -1;
654
655         list_for_each_entry(pr, &devices, list) {
656                 if (!strcmp(pr->dev, fs)) {
657                         struct stat s;
658                         FILE *fp = NULL;
659                         char tag[32];
660                         char uuid[32] = { 0 };
661
662                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
663                         if (stat(tag, &s)) {
664                                 fp = fopen(tag, "w+");
665                                 if (!fp) {
666                                         fprintf(stderr, "extroot: failed to write uuid tag file\n");
667                                         /* return 0 to continue boot regardless of error */
668                                         return 0;
669                                 }
670                                 fputs(pr->uuid, fp);
671                                 fclose(fp);
672                                 return 0;
673                         }
674
675                         fp = fopen(tag, "r");
676                         if (!fp) {
677                                 fprintf(stderr, "extroot: failed to open uuid tag file\n");
678                                 return -1;
679                         }
680
681                         fgets(uuid, sizeof(uuid), fp);
682                         fclose(fp);
683                         if (!strcmp(uuid, pr->uuid))
684                                 return 0;
685                         fprintf(stderr, "extroot: uuid tag does not match rom uuid\n");
686                 }
687         }
688         return -1;
689 }
690
691 static int mount_extroot(char *cfg)
692 {
693         char overlay[] = "/tmp/overlay";
694         char mnt[] = "/tmp/mnt";
695         char *path = mnt;
696         struct blkid_struct_probe *pr;
697         struct mount *m;
698         int err = -1;
699
700         if (config_load(cfg))
701                 return -2;
702
703         m = find_block(NULL, NULL, NULL, "/");
704         if (!m)
705                 m = find_block(NULL, NULL, NULL, "/overlay");
706
707         if (!m || !m->extroot)
708                 return -1;
709
710         pr = find_block_info(m->uuid, m->label, NULL);
711
712         if (!pr && delay_root){
713                 fprintf(stderr, "extroot: is not ready yet, retrying in %ui seconds\n", delay_root);
714                 sleep(delay_root);
715                 mkblkdev();
716                 cache_load(0);
717                 pr = find_block_info(m->uuid, m->label, NULL);
718         }
719         if (pr) {
720                 if (strncmp(pr->id->name, "ext", 3)) {
721                         fprintf(stderr, "extroot: %s is not supported, try ext4\n", pr->id->name);
722                         return -1;
723                 }
724                 if (m->overlay)
725                         path = overlay;
726                 mkdir_p(path);
727
728                 if (check_fs)
729                         check_filesystem(pr);
730
731                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
732
733                 if (err) {
734                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
735                                         pr->dev, pr->id->name, path, err, strerror(err));
736                 } else if (m->overlay) {
737                         err = check_extroot(path);
738                         if (err)
739                                 umount(path);
740                 }
741         }
742
743         return err;
744 }
745
746 static int main_extroot(int argc, char **argv)
747 {
748         struct blkid_struct_probe *pr;
749         char fs[32] = { 0 };
750         char fs_data[32] = { 0 };
751         int err = -1;
752
753         if (!getenv("PREINIT"))
754                 return -1;
755
756         if (argc != 2) {
757                 fprintf(stderr, "Usage: block extroot mountpoint\n");
758                 return -1;
759         }
760
761         mkblkdev();
762         cache_load(1);
763
764         find_block_mtd("rootfs", fs, sizeof(fs));
765         if (!fs[0])
766                 return -2;
767
768         pr = find_block_info(NULL, NULL, fs);
769         if (!pr)
770                 return -3;
771
772         find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
773         if (fs_data[0]) {
774                 pr = find_block_info(NULL, NULL, fs_data);
775                 if (pr && !strcmp(pr->id->name, "jffs2")) {
776                         char cfg[] = "/tmp/jffs_cfg";
777
778                         mkdir_p(cfg);
779                         if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
780                                 err = mount_extroot(cfg);
781                                 umount2(cfg, MNT_DETACH);
782                         }
783                         if (err < 0)
784                                 rmdir("/tmp/overlay");
785                         rmdir(cfg);
786                         return err;
787                 }
788         }
789
790         return mount_extroot(NULL);
791 }
792
793 static int main_mount(int argc, char **argv)
794 {
795         struct blkid_struct_probe *pr;
796
797         if (config_load(NULL))
798                 return -1;
799
800         cache_load(0);
801         list_for_each_entry(pr, &devices, list)
802                 mount_device(pr, 0);
803
804         return 0;
805 }
806
807 static int main_umount(int argc, char **argv)
808 {
809         struct blkid_struct_probe *pr;
810
811         if (config_load(NULL))
812                 return -1;
813
814         cache_load(0);
815         list_for_each_entry(pr, &devices, list)
816                 umount_device(pr);
817
818         return 0;
819 }
820
821 static int main_detect(int argc, char **argv)
822 {
823         struct blkid_struct_probe *pr;
824
825         cache_load(0);
826         printf("config 'global'\n");
827         printf("\toption\tanon_swap\t'0'\n");
828         printf("\toption\tanon_mount\t'0'\n");
829         printf("\toption\tauto_swap\t'1'\n");
830         printf("\toption\tauto_mount\t'1'\n");
831         printf("\toption\tdelay_root\t'0'\n");
832         printf("\toption\tcheck_fs\t'0'\n\n");
833         list_for_each_entry(pr, &devices, list)
834                 print_block_uci(pr);
835
836         return 0;
837 }
838
839 static int main_info(int argc, char **argv)
840 {
841         int i;
842         struct blkid_struct_probe *pr;
843
844         cache_load(1);
845         if (argc == 2) {
846                 list_for_each_entry(pr, &devices, list)
847                         print_block_info(pr);
848
849                 return 0;
850         };
851
852         for (i = 2; i < argc; i++) {
853                 struct stat s;
854
855                 if (stat(argv[i], &s)) {
856                         fprintf(stderr, "failed to stat %s\n", argv[i]);
857                         continue;
858                 }
859                 if (!S_ISBLK(s.st_mode)) {
860                         fprintf(stderr, "%s is not a block device\n", argv[i]);
861                         continue;
862                 }
863                 pr = find_block_info(NULL, NULL, argv[i]);
864                 if (pr)
865                         print_block_info(pr);
866         }
867
868         return 0;
869 }
870
871 static int main_swapon(int argc, char **argv)
872 {
873         if (argc != 2) {
874                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a      Stop swapping on all swap devices\n");
875                 return -1;
876         }
877
878         if (!strcmp(argv[1], "-a")) {
879                 struct blkid_struct_probe *pr;
880
881                 cache_load(0);
882                 list_for_each_entry(pr, &devices, list) {
883                         if (strcmp(pr->id->name, "swap"))
884                                 continue;
885                         if (swapon(pr->dev, 0))
886                                 fprintf(stderr, "failed to swapon %s\n", pr->dev);
887                 }
888         } else {
889                 struct stat s;
890                 int err;
891
892                 if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
893                         fprintf(stderr, "%s is not a block device\n", argv[1]);
894                         return -1;
895                 }
896                 err = swapon(argv[1], 0);
897                 if (err) {
898                         fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
899                         return err;
900                 }
901         }
902
903         return 0;
904 }
905
906 static int main_swapoff(int argc, char **argv)
907 {
908         if (argc != 2) {
909                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a      Stop swapping on all swap devices\n");
910                 return -1;
911         }
912
913         if (!strcmp(argv[1], "-a")) {
914                 FILE *fp = fopen("/proc/swaps", "r");
915                 char line[256];
916
917                 if (!fp) {
918                         fprintf(stderr, "failed to open /proc/swaps\n");
919                         return -1;
920                 }
921                 fgets(line, sizeof(line), fp);
922                 while (fgets(line, sizeof(line), fp)) {
923                         char *end = strchr(line, ' ');
924                         int err;
925
926                         if (!end)
927                                 continue;
928                         *end = '\0';
929                         err = swapoff(line);
930                         if (err)
931                                 fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
932                 }
933                 fclose(fp);
934         } else {
935                 struct stat s;
936                 int err;
937
938                 if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
939                         fprintf(stderr, "%s is not a block device\n", argv[1]);
940                         return -1;
941                 }
942                 err = swapoff(argv[1]);
943                 if (err) {
944                         fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
945                         return err;
946                 }
947         }
948
949         return 0;
950 }
951
952 int main(int argc, char **argv)
953 {
954         char *base = basename(*argv);
955
956         umask(0);
957
958         if (!strcmp(base, "swapon"))
959                 return main_swapon(argc, argv);
960
961         if (!strcmp(base, "swapoff"))
962                 return main_swapoff(argc, argv);
963
964         if ((argc > 1) && !strcmp(base, "block")) {
965                 if (!strcmp(argv[1], "info"))
966                         return main_info(argc, argv);
967
968                 if (!strcmp(argv[1], "detect"))
969                         return main_detect(argc, argv);
970
971                 if (!strcmp(argv[1], "hotplug"))
972                         return main_hotplug(argc, argv);
973
974                 if (!strcmp(argv[1], "extroot"))
975                         return main_extroot(argc, argv);
976
977                 if (!strcmp(argv[1], "mount"))
978                         return main_mount(argc, argv);
979
980                 if (!strcmp(argv[1], "umount"))
981                         return main_umount(argc, argv);
982         }
983
984         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
985
986         return -1;
987 }