libfstools: fix multiple volume_identify usages with the same volume
[project/fstools.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 #define _GNU_SOURCE
16 #include <getopt.h>
17 #include <stdio.h>
18 #include <unistd.h>
19 #include <syslog.h>
20 #include <libgen.h>
21 #include <glob.h>
22 #include <dirent.h>
23 #include <stdarg.h>
24 #include <string.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <limits.h>
28
29 #include <sys/stat.h>
30 #include <sys/types.h>
31 #include <sys/swap.h>
32 #include <sys/mount.h>
33 #include <sys/wait.h>
34 #include <sys/sysmacros.h>
35
36 #include <linux/fs.h>
37
38 #include <uci.h>
39 #include <uci_blob.h>
40
41 #include <libubox/ulog.h>
42 #include <libubox/list.h>
43 #include <libubox/vlist.h>
44 #include <libubox/blobmsg_json.h>
45 #include <libubox/avl-cmp.h>
46 #include <libubus.h>
47
48 #include "probe.h"
49
50 #define AUTOFS_MOUNT_PATH       "/tmp/run/blockd/"
51
52 #ifdef UBIFS_EXTROOT
53 #include "libubi/libubi.h"
54 #endif
55
56 enum {
57         TYPE_MOUNT,
58         TYPE_SWAP,
59 };
60
61 enum {
62         TYPE_DEV,
63         TYPE_HOTPLUG,
64         TYPE_AUTOFS,
65 };
66
67 struct mount {
68         struct vlist_node node;
69         int type;
70
71         char *target;
72         char *path;
73         char *options;
74         uint32_t flags;
75         char *uuid;
76         char *label;
77         char *device;
78         int extroot;
79         int autofs;
80         int overlay;
81         int disabled_fsck;
82         unsigned int prio;
83 };
84
85 static struct vlist_tree mounts;
86 static struct blob_buf b;
87 static LIST_HEAD(devices);
88 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
89 static unsigned int delay_root;
90
91 enum {
92         CFG_ANON_MOUNT,
93         CFG_ANON_SWAP,
94         CFG_AUTO_MOUNT,
95         CFG_AUTO_SWAP,
96         CFG_DELAY_ROOT,
97         CFG_CHECK_FS,
98         __CFG_MAX
99 };
100
101 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
102         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
103         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
104         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
105         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
106         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
107         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
108 };
109
110 enum {
111         MOUNT_UUID,
112         MOUNT_LABEL,
113         MOUNT_ENABLE,
114         MOUNT_TARGET,
115         MOUNT_DEVICE,
116         MOUNT_OPTIONS,
117         MOUNT_AUTOFS,
118         __MOUNT_MAX
119 };
120
121 static const struct uci_blob_param_list config_attr_list = {
122         .n_params = __CFG_MAX,
123         .params = config_policy,
124 };
125
126 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
127         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
128         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
129         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
130         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
131         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
132         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
133         [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 },
134 };
135
136 static const struct uci_blob_param_list mount_attr_list = {
137         .n_params = __MOUNT_MAX,
138         .params = mount_policy,
139 };
140
141 enum {
142         SWAP_ENABLE,
143         SWAP_UUID,
144         SWAP_LABEL,
145         SWAP_DEVICE,
146         SWAP_PRIO,
147         __SWAP_MAX
148 };
149
150 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
151         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
152         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
153         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
154         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
155         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
156 };
157
158 static const struct uci_blob_param_list swap_attr_list = {
159         .n_params = __SWAP_MAX,
160         .params = swap_policy,
161 };
162
163 struct mount_flag {
164         const char *name;
165         int32_t flag;
166 };
167
168 static const struct mount_flag mount_flags[] = {
169         { "sync",               MS_SYNCHRONOUS  },
170         { "async",              ~MS_SYNCHRONOUS },
171         { "dirsync",            MS_DIRSYNC      },
172         { "mand",               MS_MANDLOCK     },
173         { "nomand",             ~MS_MANDLOCK    },
174         { "atime",              ~MS_NOATIME     },
175         { "noatime",            MS_NOATIME      },
176         { "dev",                ~MS_NODEV       },
177         { "nodev",              MS_NODEV        },
178         { "diratime",           ~MS_NODIRATIME  },
179         { "nodiratime",         MS_NODIRATIME   },
180         { "exec",               ~MS_NOEXEC      },
181         { "noexec",             MS_NOEXEC       },
182         { "suid",               ~MS_NOSUID      },
183         { "nosuid",             MS_NOSUID       },
184         { "rw",                 ~MS_RDONLY      },
185         { "ro",                 MS_RDONLY       },
186         { "relatime",           MS_RELATIME     },
187         { "norelatime",         ~MS_RELATIME    },
188         { "strictatime",        MS_STRICTATIME  },
189         { "acl",                MS_POSIXACL     },
190         { "noacl",              ~MS_POSIXACL    },
191         { "nouser_xattr",       MS_NOUSER       },
192         { "user_xattr",         ~MS_NOUSER      },
193 };
194
195 static char *blobmsg_get_strdup(struct blob_attr *attr)
196 {
197         if (!attr)
198                 return NULL;
199
200         return strdup(blobmsg_get_string(attr));
201 }
202
203 static char *blobmsg_get_basename(struct blob_attr *attr)
204 {
205         if (!attr)
206                 return NULL;
207
208         return strdup(basename(blobmsg_get_string(attr)));
209 }
210
211 static void parse_mount_options(struct mount *m, char *optstr)
212 {
213         int i;
214         bool is_flag;
215         char *p, *opts, *last;
216
217         m->flags = 0;
218         m->options = NULL;
219
220         if (!optstr || !*optstr)
221                 return;
222
223         m->options = opts = calloc(1, strlen(optstr) + 1);
224
225         if (!m->options)
226                 return;
227
228         p = last = optstr;
229
230         do {
231                 p = strchr(p, ',');
232
233                 if (p)
234                         *p++ = 0;
235
236                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
237                         if (!strcmp(last, mount_flags[i].name)) {
238                                 if (mount_flags[i].flag < 0)
239                                         m->flags &= (uint32_t)mount_flags[i].flag;
240                                 else
241                                         m->flags |= (uint32_t)mount_flags[i].flag;
242                                 is_flag = true;
243                                 break;
244                         }
245                 }
246
247                 if (!is_flag)
248                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
249
250                 last = p;
251
252         } while (p);
253
254         free(optstr);
255 }
256
257 static int mount_add(struct uci_section *s)
258 {
259         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
260         struct mount *m;
261
262         blob_buf_init(&b, 0);
263         uci_to_blob(&b, s, &mount_attr_list);
264         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
265
266         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
267                 return -1;
268
269         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
270                 return -1;
271
272         m = malloc(sizeof(struct mount));
273         m->type = TYPE_MOUNT;
274         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
275         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
276         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
277         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
278         if (tb[MOUNT_AUTOFS])
279                 m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]);
280         else
281                 m->autofs = 0;
282         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
283
284         m->overlay = m->extroot = 0;
285         if (m->target && !strcmp(m->target, "/"))
286                 m->extroot = 1;
287         if (m->target && !strcmp(m->target, "/overlay"))
288                 m->extroot = m->overlay = 1;
289
290         if (m->target && *m->target != '/') {
291                 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
292                           s->e.name, m->target);
293                 free(m);
294                 return -1;
295         }
296
297         if (m->uuid)
298                 vlist_add(&mounts, &m->node, m->uuid);
299         else if (m->label)
300                 vlist_add(&mounts, &m->node, m->label);
301         else if (m->device)
302                 vlist_add(&mounts, &m->node, m->device);
303
304         return 0;
305 }
306
307 static int swap_add(struct uci_section *s)
308 {
309         struct blob_attr *tb[__SWAP_MAX] = { 0 };
310         struct mount *m;
311
312         blob_buf_init(&b, 0);
313         uci_to_blob(&b, s, &swap_attr_list);
314         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
315
316         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
317                 return -1;
318
319         m = malloc(sizeof(struct mount));
320         memset(m, 0, sizeof(struct mount));
321         m->type = TYPE_SWAP;
322         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
323         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
324         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
325         if (tb[SWAP_PRIO])
326                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
327         if (m->prio)
328                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
329
330         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
331                 /* store complete swap path */
332                 if (tb[SWAP_DEVICE])
333                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
334
335                 if (m->uuid)
336                         vlist_add(&mounts, &m->node, m->uuid);
337                 else if (m->label)
338                         vlist_add(&mounts, &m->node, m->label);
339                 else if (m->device)
340                         vlist_add(&mounts, &m->node, m->device);
341         }
342
343         return 0;
344 }
345
346 static int global_add(struct uci_section *s)
347 {
348         struct blob_attr *tb[__CFG_MAX] = { 0 };
349
350         blob_buf_init(&b, 0);
351         uci_to_blob(&b, s, &config_attr_list);
352         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
353
354         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
355                 anon_mount = 1;
356         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
357                 anon_swap = 1;
358
359         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
360                 auto_mount = 1;
361         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
362                 auto_swap = 1;
363
364         if (tb[CFG_DELAY_ROOT])
365                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
366
367         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
368                 check_fs = 1;
369
370         return 0;
371 }
372
373 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
374 {
375         struct mount *m;
376
377         vlist_for_each_element(&mounts, m, node) {
378                 if (m->type != TYPE_SWAP)
379                         continue;
380                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
381                         return m;
382                 if (label && m->label && !strcmp(m->label, label))
383                         return m;
384                 if (device && m->device && !strcmp(m->device, device))
385                         return m;
386         }
387
388         return NULL;
389 }
390
391 static struct mount* find_block(const char *uuid, const char *label, const char *device,
392                                 const char *target)
393 {
394         struct mount *m;
395
396         vlist_for_each_element(&mounts, m, node) {
397                 if (m->type != TYPE_MOUNT)
398                         continue;
399                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
400                         return m;
401                 if (m->label && label && !strcmp(m->label, label))
402                         return m;
403                 if (m->target && target && !strcmp(m->target, target))
404                         return m;
405                 if (m->device && device && !strcmp(m->device, device))
406                         return m;
407         }
408
409         return NULL;
410 }
411
412 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
413                           struct vlist_node *node_old)
414 {
415 }
416
417 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
418 {
419         char *file = basename(path);
420         char *dir = dirname(path);
421         char *err;
422         struct uci_package *pkg;
423
424         uci_set_confdir(ctx, dir);
425         ULOG_INFO("attempting to load %s/%s\n", dir, file);
426
427         if (uci_load(ctx, file, &pkg)) {
428                 uci_get_errorstr(ctx, &err, file);
429                 ULOG_ERR("unable to load configuration (%s)\n", err);
430
431                 free(err);
432                 return NULL;
433         }
434
435         return pkg;
436 }
437
438 static int config_load(char *cfg)
439 {
440         struct uci_context *ctx = uci_alloc_context();
441         struct uci_package *pkg = NULL;
442         struct uci_element *e;
443         char path[64];
444
445         vlist_init(&mounts, avl_strcmp, mounts_update);
446
447         if (cfg) {
448                 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
449                 pkg = config_try_load(ctx, path);
450
451                 if (!pkg) {
452                         snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
453                         pkg = config_try_load(ctx, path);
454                 }
455         }
456
457         if (!pkg) {
458                 snprintf(path, sizeof(path), "/etc/config/fstab");
459                 pkg = config_try_load(ctx, path);
460         }
461
462         if (!pkg) {
463                 ULOG_ERR("no usable configuration\n");
464                 return -1;
465         }
466
467         vlist_update(&mounts);
468         uci_foreach_element(&pkg->sections, e) {
469                 struct uci_section *s = uci_to_section(e);
470
471                 if (!strcmp(s->type, "mount"))
472                         mount_add(s);
473                 if (!strcmp(s->type, "swap"))
474                         swap_add(s);
475                 if (!strcmp(s->type, "global"))
476                         global_add(s);
477         }
478         vlist_flush(&mounts);
479
480         return 0;
481 }
482
483 static struct probe_info* _probe_path(char *path)
484 {
485         struct probe_info *pr;
486         char tmppath[64];
487
488         /* skip ubi device if ubiblock device is present */
489         if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
490             path[8] >= '0' && path[8] <= '9' ) {
491                 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
492                 list_for_each_entry(pr, &devices, list)
493                         if (!strcasecmp(pr->dev, tmppath))
494                                 return NULL;
495         }
496
497         return probe_path(path);
498 }
499
500 static int _cache_load(const char *path)
501 {
502         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
503         int j;
504         glob_t gl;
505
506         if (glob(path, gl_flags, NULL, &gl) < 0)
507                 return -1;
508
509         for (j = 0; j < gl.gl_pathc; j++) {
510                 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
511                 if (pr)
512                         list_add_tail(&pr->list, &devices);
513         }
514
515         globfree(&gl);
516
517         return 0;
518 }
519
520 static void cache_load(int mtd)
521 {
522         if (mtd) {
523                 _cache_load("/dev/mtdblock*");
524                 _cache_load("/dev/ubiblock*");
525                 _cache_load("/dev/ubi[0-9]*");
526         }
527         _cache_load("/dev/loop*");
528         _cache_load("/dev/mmcblk*");
529         _cache_load("/dev/sd*");
530         _cache_load("/dev/hd*");
531         _cache_load("/dev/md*");
532         _cache_load("/dev/vd*");
533         _cache_load("/dev/mapper/*");
534 }
535
536
537 static int print_block_uci(struct probe_info *pr)
538 {
539         if (!strcmp(pr->type, "swap")) {
540                 printf("config 'swap'\n");
541         } else {
542                 printf("config 'mount'\n");
543                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
544         }
545         if (pr->uuid)
546                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
547         else
548                 printf("\toption\tdevice\t'%s'\n", pr->dev);
549         printf("\toption\tenabled\t'0'\n\n");
550
551         return 0;
552 }
553
554 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
555 {
556         struct probe_info *pr = NULL;
557
558         if (uuid)
559                 list_for_each_entry(pr, &devices, list)
560                         if (pr->uuid && !strcasecmp(pr->uuid, uuid))
561                                 return pr;
562
563         if (label)
564                 list_for_each_entry(pr, &devices, list)
565                         if (pr->label && !strcmp(pr->label, label))
566                                 return pr;
567
568         if (path)
569                 list_for_each_entry(pr, &devices, list)
570                         if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
571                                 return pr;
572
573         return NULL;
574 }
575
576 static char* find_mount_point(char *block)
577 {
578         FILE *fp = fopen("/proc/self/mountinfo", "r");
579         static char line[256];
580         int len = strlen(block);
581         char *point = NULL, *pos, *tmp, *cpoint, *devname;
582         struct stat s;
583         int rstat;
584         unsigned int minor, major;
585
586         if (!fp)
587                 return NULL;
588
589         rstat = stat(block, &s);
590
591         while (fgets(line, sizeof(line), fp)) {
592                 pos = strchr(line, ' ');
593                 if (!pos)
594                         continue;
595
596                 pos = strchr(pos + 1, ' ');
597                 if (!pos)
598                         continue;
599
600                 tmp = ++pos;
601                 pos = strchr(pos, ':');
602                 if (!pos)
603                         continue;
604
605                 *pos = '\0';
606                 major = atoi(tmp);
607                 tmp = ++pos;
608                 pos = strchr(pos, ' ');
609                 if (!pos)
610                         continue;
611
612                 *pos = '\0';
613                 minor = atoi(tmp);
614                 pos = strchr(pos + 1, ' ');
615                 if (!pos)
616                         continue;
617                 tmp = ++pos;
618
619                 pos = strchr(pos, ' ');
620                 if (!pos)
621                         continue;
622                 *pos = '\0';
623                 cpoint = tmp;
624
625                 pos = strchr(pos + 1, ' ');
626                 if (!pos)
627                         continue;
628
629                 pos = strchr(pos + 1, ' ');
630                 if (!pos)
631                         continue;
632
633                 pos = strchr(pos + 1, ' ');
634                 if (!pos)
635                         continue;
636
637                 tmp = ++pos;
638                 pos = strchr(pos, ' ');
639                 if (!pos)
640                         continue;
641
642                 *pos = '\0';
643                 devname = tmp;
644                 if (!strncmp(block, devname, len)) {
645                         point = strdup(cpoint);
646                         break;
647                 }
648
649                 if (rstat)
650                         continue;
651
652                 if (!S_ISBLK(s.st_mode))
653                         continue;
654
655                 if (major == major(s.st_rdev) &&
656                     minor == minor(s.st_rdev)) {
657                         point = strdup(cpoint);
658                         break;
659                 }
660         }
661
662         fclose(fp);
663
664         return point;
665 }
666
667 static int print_block_info(struct probe_info *pr)
668 {
669         static char *mp;
670
671         mp = find_mount_point(pr->dev);
672         printf("%s:", pr->dev);
673         if (pr->uuid)
674                 printf(" UUID=\"%s\"", pr->uuid);
675
676         if (pr->label)
677                 printf(" LABEL=\"%s\"", pr->label);
678
679         if (pr->version)
680                 printf(" VERSION=\"%s\"", pr->version);
681
682         if (mp) {
683                 printf(" MOUNT=\"%s\"", mp);
684                 free(mp);
685         }
686
687         printf(" TYPE=\"%s\"\n", pr->type);
688
689         return 0;
690 }
691
692 static void mkdir_p(char *dir)
693 {
694         char *l = strrchr(dir, '/');
695
696         if (l) {
697                 *l = '\0';
698                 mkdir_p(dir);
699                 *l = '/';
700                 mkdir(dir, 0755);
701         }
702 }
703
704 static void check_filesystem(struct probe_info *pr)
705 {
706         pid_t pid;
707         struct stat statbuf;
708         const char *e2fsck = "/usr/sbin/e2fsck";
709         const char *f2fsck = "/usr/sbin/fsck.f2fs";
710         const char *dosfsck = "/usr/sbin/dosfsck";
711         const char *ckfs;
712
713         /* UBIFS does not need stuff like fsck */
714         if (!strncmp(pr->type, "ubifs", 5))
715                 return;
716
717         if (!strncmp(pr->type, "vfat", 4)) {
718                 ckfs = dosfsck;
719         } else if (!strncmp(pr->type, "f2fs", 4)) {
720                 ckfs = f2fsck;
721         } else if (!strncmp(pr->type, "ext", 3)) {
722                 ckfs = e2fsck;
723         } else {
724                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
725                 return;
726         }
727
728         if (stat(ckfs, &statbuf) < 0) {
729                 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
730                 return;
731         }
732
733         pid = fork();
734         if (!pid) {
735                 if(!strncmp(pr->type, "f2fs", 4)) {
736                         execl(ckfs, ckfs, "-f", pr->dev, NULL);
737                         exit(-1);
738                 } else {
739                         execl(ckfs, ckfs, "-p", pr->dev, NULL);
740                         exit(-1);
741                 }
742         } else if (pid > 0) {
743                 int status;
744
745                 waitpid(pid, &status, 0);
746                 if (WEXITSTATUS(status))
747                         ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
748         }
749 }
750
751 static void handle_swapfiles(bool on)
752 {
753         struct stat s;
754         struct mount *m;
755         struct probe_info *pr;
756
757         vlist_for_each_element(&mounts, m, node)
758         {
759                 if (m->type != TYPE_SWAP || !m->target)
760                         continue;
761
762                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
763                         continue;
764
765                 pr = _probe_path(m->target);
766
767                 if (!pr)
768                         continue;
769
770                 if (!strcmp(pr->type, "swap")) {
771                         if (on)
772                                 swapon(pr->dev, m->prio);
773                         else
774                                 swapoff(pr->dev);
775                 }
776
777                 free(pr);
778         }
779 }
780
781 static void to_devnull(int fd)
782 {
783         int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
784
785         if (devnull >= 0)
786                 dup2(devnull, fd);
787
788         if (devnull > STDERR_FILENO)
789                 close(devnull);
790 }
791
792 static int exec_mount(const char *source, const char *target,
793                       const char *fstype, const char *options)
794 {
795         pid_t pid;
796         struct stat s;
797         FILE *mount_fd;
798         int err, status, pfds[2];
799         char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
800
801         snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
802
803         if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
804                 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
805                 return -1;
806         }
807
808         if (pipe(pfds) < 0)
809                 return -1;
810
811         fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
812         fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
813
814         pid = vfork();
815
816         switch (pid) {
817         case -1:
818                 close(pfds[0]);
819                 close(pfds[1]);
820
821                 return -1;
822
823         case 0:
824                 to_devnull(STDIN_FILENO);
825                 to_devnull(STDOUT_FILENO);
826
827                 dup2(pfds[1], STDERR_FILENO);
828                 close(pfds[0]);
829                 close(pfds[1]);
830
831                 if (options && *options)
832                         execl(cmd, cmd, "-o", options, source, target, NULL);
833                 else
834                         execl(cmd, cmd, source, target, NULL);
835
836                 return -1;
837
838         default:
839                 close(pfds[1]);
840
841                 mount_fd = fdopen(pfds[0], "r");
842
843                 while (fgets(errmsg, sizeof(errmsg), mount_fd))
844                         ULOG_ERR("mount.%s: %s", fstype, errmsg);
845
846                 fclose(mount_fd);
847
848                 err = waitpid(pid, &status, 0);
849
850                 if (err != -1) {
851                         if (status != 0) {
852                                 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
853                                 errno = EINVAL;
854                                 err = -1;
855                         } else {
856                                 errno = 0;
857                                 err = 0;
858                         }
859                 }
860
861                 break;
862         }
863
864         return err;
865 }
866
867 static int handle_mount(const char *source, const char *target,
868                         const char *fstype, struct mount *m)
869 {
870         int i, err;
871         size_t mount_opts_len;
872         char *mount_opts = NULL, *ptr;
873
874         err = mount(source, target, fstype, m ? m->flags : 0,
875                     (m && m->options) ? m->options : "");
876
877         /* Requested file system type is not available in kernel,
878            attempt to call mount helper. */
879         if (err == -1 && errno == ENODEV) {
880                 if (m) {
881                         /* Convert mount flags back into string representation,
882                            first calculate needed length of string buffer... */
883                         mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
884
885                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
886                                 if ((mount_flags[i].flag > 0) &&
887                                     (mount_flags[i].flag < INT_MAX) &&
888                                     (m->flags & (uint32_t)mount_flags[i].flag))
889                                         mount_opts_len += strlen(mount_flags[i].name) + 1;
890
891                         /* ... then now allocate and fill it ... */
892                         ptr = mount_opts = calloc(1, mount_opts_len);
893
894                         if (!ptr) {
895                                 errno = ENOMEM;
896                                 return -1;
897                         }
898
899                         if (m->options)
900                                 ptr += sprintf(ptr, "%s,", m->options);
901
902                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
903                                 if ((mount_flags[i].flag > 0) &&
904                                     (mount_flags[i].flag < INT_MAX) &&
905                                     (m->flags & (uint32_t)mount_flags[i].flag))
906                                         ptr += sprintf(ptr, "%s,", mount_flags[i].name);
907
908                         mount_opts[mount_opts_len - 1] = 0;
909                 }
910
911                 /* ... and now finally invoke the external mount program */
912                 err = exec_mount(source, target, fstype, mount_opts);
913         }
914
915         return err;
916 }
917
918 static void blockd_notify(char *device, struct mount *m, struct probe_info *pr)
919 {
920         struct ubus_context *ctx = ubus_connect(NULL);
921         uint32_t id;
922
923         if (!ctx)
924                 return;
925
926         if (!ubus_lookup_id(ctx, "block", &id)) {
927                 struct blob_buf buf = { 0 };
928                 char *d = strrchr(device, '/');
929
930                 if (d)
931                         d++;
932                 else
933                         d = device;
934
935                 blob_buf_init(&buf, 0);
936
937                 if (m) {
938
939                         blobmsg_add_string(&buf, "device", d);
940                         if (m->uuid)
941                                 blobmsg_add_string(&buf, "uuid", m->uuid);
942                         if (m->label)
943                                 blobmsg_add_string(&buf, "label", m->label);
944                         if (m->target)
945                                 blobmsg_add_string(&buf, "target", m->target);
946                         if (m->options)
947                                 blobmsg_add_string(&buf, "options", m->options);
948                         if (m->autofs)
949                                 blobmsg_add_u32(&buf, "autofs", m->autofs);
950                         if (pr->type)
951                                 blobmsg_add_string(&buf, "type", pr->type);
952                         if (pr->version)
953                                 blobmsg_add_string(&buf, "version", pr->version);
954                 } else if (pr) {
955                         blobmsg_add_string(&buf, "device", d);
956                         if (pr->uuid)
957                                 blobmsg_add_string(&buf, "uuid", pr->uuid);
958                         if (pr->label)
959                                 blobmsg_add_string(&buf, "label", pr->label);
960                         if (pr->type)
961                                 blobmsg_add_string(&buf, "type", pr->type);
962                         if (pr->version)
963                                 blobmsg_add_string(&buf, "version", pr->version);
964                         blobmsg_add_u32(&buf, "anon", 1);
965                 } else {
966                         blobmsg_add_string(&buf, "device", d);
967                         blobmsg_add_u32(&buf, "remove", 1);
968                 }
969
970                 ubus_invoke(ctx, id, "hotplug", buf.head, NULL, NULL, 3000);
971         }
972
973         ubus_free(ctx);
974 }
975
976 static int mount_device(struct probe_info *pr, int type)
977 {
978         struct mount *m;
979         char *device;
980         char *mp;
981
982         if (!pr)
983                 return -1;
984
985         device = basename(pr->dev);
986
987         if (!strcmp(pr->type, "swap")) {
988                 if ((type == TYPE_HOTPLUG) && !auto_swap)
989                         return -1;
990                 m = find_swap(pr->uuid, pr->label, device);
991                 if (m || anon_swap)
992                         swapon(pr->dev, (m) ? (m->prio) : (0));
993
994                 return 0;
995         }
996
997         mp = find_mount_point(pr->dev);
998         if (mp && (type != TYPE_HOTPLUG)) {
999                 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1000                 free(mp);
1001                 return -1;
1002         }
1003
1004         m = find_block(pr->uuid, pr->label, device, NULL);
1005         if (m && m->extroot)
1006                 return -1;
1007
1008         if (m) switch (type) {
1009         case TYPE_HOTPLUG:
1010                 blockd_notify(device, m, pr);
1011                 if (m->autofs)
1012                         return 0;
1013                 if (!auto_mount)
1014                         return -1;
1015                 break;
1016         case TYPE_AUTOFS:
1017                 if (!m->autofs)
1018                         return -1;
1019                 break;
1020         case TYPE_DEV:
1021                 if (m->autofs)
1022                         return -1;
1023                 break;
1024         } else if (type == TYPE_HOTPLUG) {
1025                 blockd_notify(device, NULL, pr);
1026         }
1027
1028         if (m) {
1029                 char *target = m->target;
1030                 char _target[32];
1031                 int err = 0;
1032
1033                 if (m->autofs) {
1034                         snprintf(_target, sizeof(_target), "/tmp/run/blockd/%s", device);
1035                         target = _target;
1036                 }
1037                 if (!target) {
1038                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
1039                         target = _target;
1040                 }
1041                 mkdir_p(target);
1042
1043                 if (check_fs)
1044                         check_filesystem(pr);
1045
1046                 err = handle_mount(pr->dev, target, pr->type, m);
1047                 if (err)
1048                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
1049                                  pr->dev, pr->type, target, errno, strerror(errno));
1050                 else
1051                         handle_swapfiles(true);
1052                 return err;
1053         }
1054
1055         if (anon_mount) {
1056                 char target[32];
1057                 int err = 0;
1058
1059                 snprintf(target, sizeof(target), "/mnt/%s", device);
1060                 mkdir_p(target);
1061
1062                 if (check_fs)
1063                         check_filesystem(pr);
1064
1065                 err = handle_mount(pr->dev, target, pr->type, NULL);
1066                 if (err)
1067                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
1068                                  pr->dev, pr->type, target, errno, strerror(errno));
1069                 else
1070                         handle_swapfiles(true);
1071                 return err;
1072         }
1073
1074         return 0;
1075 }
1076
1077 static int umount_device(struct probe_info *pr)
1078 {
1079         struct mount *m;
1080         char *device = basename(pr->dev);
1081         char *mp;
1082         int err;
1083
1084         if (!pr)
1085                 return -1;
1086
1087         if (!strcmp(pr->type, "swap"))
1088                 return -1;
1089
1090         mp = find_mount_point(pr->dev);
1091         if (!mp)
1092                 return -1;
1093
1094         m = find_block(pr->uuid, pr->label, device, NULL);
1095         if (m && m->extroot)
1096                 return -1;
1097
1098         err = umount2(mp, MNT_DETACH);
1099         if (err)
1100                 ULOG_ERR("unmounting %s (%s)  failed (%d) - %s\n",
1101                          pr->dev, mp, errno, strerror(errno));
1102         else
1103                 ULOG_INFO("unmounted %s (%s)\n",
1104                           pr->dev, mp);
1105
1106         free(mp);
1107         return err;
1108 }
1109
1110 static int mount_action(char *action, char *device, int type)
1111 {
1112         char path[32];
1113         char *mount_point;
1114
1115         if (!action || !device)
1116                 return -1;
1117         snprintf(path, sizeof(path), "/dev/%s", device);
1118
1119         if (!strcmp(action, "remove")) {
1120                 int err = 0;
1121
1122                 if (type == TYPE_HOTPLUG)
1123                         blockd_notify(device, NULL, NULL);
1124
1125                 mount_point = find_mount_point(path);
1126                 if (mount_point)
1127                         err = umount2(mount_point, MNT_DETACH);
1128
1129                 if (err)
1130                         ULOG_ERR("umount of %s failed (%d) - %s\n",
1131                                  mount_point, errno, strerror(errno));
1132
1133                 free(mount_point);
1134                 return 0;
1135         } else if (strcmp(action, "add")) {
1136                 ULOG_ERR("Unkown action %s\n", action);
1137
1138                 return -1;
1139         }
1140
1141         if (config_load(NULL))
1142                 return -1;
1143         cache_load(0);
1144
1145         return mount_device(find_block_info(NULL, NULL, path), type);
1146 }
1147
1148 static int main_hotplug(int argc, char **argv)
1149 {
1150         return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1151 }
1152
1153 static int main_autofs(int argc, char **argv)
1154 {
1155         if (argc < 3)
1156                 return -1;
1157
1158         if (!strcmp(argv[2], "start")) {
1159                 struct probe_info *pr;
1160
1161                 if (config_load(NULL))
1162                         return -1;
1163
1164                 cache_load(0);
1165                 list_for_each_entry(pr, &devices, list) {
1166                         struct mount *m = find_block(pr->uuid, pr->label, NULL, NULL);
1167
1168                         if (m && m->autofs)
1169                                 mount_device(pr, TYPE_HOTPLUG);
1170                         else
1171                                 blockd_notify(pr->dev, m, pr);
1172                 }
1173                 return 0;
1174         }
1175         return mount_action(argv[2], argv[3], TYPE_AUTOFS);
1176 }
1177
1178 static int find_block_mtd(char *name, char *part, int plen)
1179 {
1180         FILE *fp = fopen("/proc/mtd", "r");
1181         static char line[256];
1182         char *index = NULL;
1183
1184         if(!fp)
1185                 return -1;
1186
1187         while (!index && fgets(line, sizeof(line), fp)) {
1188                 if (strstr(line, name)) {
1189                         char *eol = strstr(line, ":");
1190
1191                         if (!eol)
1192                                 continue;
1193
1194                         *eol = '\0';
1195                         index = &line[3];
1196                 }
1197         }
1198
1199         fclose(fp);
1200
1201         if (!index)
1202                 return -1;
1203
1204         snprintf(part, plen, "/dev/mtdblock%s", index);
1205
1206         return 0;
1207 }
1208
1209 #ifdef UBIFS_EXTROOT
1210 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1211 {
1212         int dev = 0;
1213
1214         while (ubi_dev_present(libubi, dev))
1215         {
1216                 struct ubi_dev_info dev_info;
1217                 struct ubi_vol_info vol_info;
1218
1219                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1220                         continue;
1221                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1222                         continue;
1223
1224                 *dev_num = dev_info.dev_num;
1225                 *vol_id = vol_info.vol_id;
1226
1227                 return 0;
1228         }
1229
1230         return -1;
1231 }
1232
1233 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1234 {
1235         int dev_num;
1236         int vol_id;
1237         int err = -1;
1238
1239         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1240         if (!err)
1241                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1242
1243         return err;
1244 }
1245
1246 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1247 {
1248         int dev_num;
1249         int vol_id;
1250         int err = -1;
1251
1252         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1253         if (!err)
1254                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1255
1256         return err;
1257 }
1258
1259 #else
1260
1261 static int find_root_dev(char *buf, int len)
1262 {
1263         DIR *d;
1264         dev_t root;
1265         struct stat s;
1266         struct dirent *e;
1267
1268         if (stat("/", &s))
1269                 return -1;
1270
1271         if (!(d = opendir("/dev")))
1272                 return -1;
1273
1274         root = s.st_dev;
1275
1276         while ((e = readdir(d)) != NULL) {
1277                 snprintf(buf, len, "/dev/%s", e->d_name);
1278
1279                 if (stat(buf, &s) || s.st_rdev != root)
1280                         continue;
1281
1282                 closedir(d);
1283                 return 0;
1284         }
1285
1286         closedir(d);
1287         return -1;
1288 }
1289
1290 #endif
1291
1292 static int test_fs_support(const char *name)
1293 {
1294         char line[128], *p;
1295         int rv = -1;
1296         FILE *f;
1297
1298         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1299                 while (fgets(line, sizeof(line), f)) {
1300                         p = strtok(line, "\t\n");
1301
1302                         if (p && !strcmp(p, "nodev"))
1303                                 p = strtok(NULL, "\t\n");
1304
1305                         if (p && !strcmp(p, name)) {
1306                                 rv = 0;
1307                                 break;
1308                         }
1309                 }
1310                 fclose(f);
1311         }
1312
1313         return rv;
1314 }
1315
1316 static int check_extroot(char *path)
1317 {
1318         struct probe_info *pr = NULL;
1319         char devpath[32];
1320
1321 #ifdef UBIFS_EXTROOT
1322         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1323                 int err = -1;
1324                 libubi_t libubi;
1325
1326                 libubi = libubi_open();
1327                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1328                 libubi_close(libubi);
1329                 if (err)
1330                         return -1;
1331         }
1332 #else
1333         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1334                 if (find_root_dev(devpath, sizeof(devpath))) {
1335                         ULOG_ERR("extroot: unable to determine root device\n");
1336                         return -1;
1337                 }
1338         }
1339 #endif
1340
1341         list_for_each_entry(pr, &devices, list) {
1342                 if (!strcmp(pr->dev, devpath)) {
1343                         struct stat s;
1344                         FILE *fp = NULL;
1345                         char tag[64];
1346                         char uuid[64] = { 0 };
1347
1348                         snprintf(tag, sizeof(tag), "%s/etc", path);
1349                         if (stat(tag, &s))
1350                                 mkdir_p(tag);
1351
1352                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1353                         if (stat(tag, &s)) {
1354                                 fp = fopen(tag, "w+");
1355                                 if (!fp) {
1356                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1357                                                  tag, errno, strerror(errno));
1358                                         /* return 0 to continue boot regardless of error */
1359                                         return 0;
1360                                 }
1361                                 fputs(pr->uuid, fp);
1362                                 fclose(fp);
1363                                 return 0;
1364                         }
1365
1366                         fp = fopen(tag, "r");
1367                         if (!fp) {
1368                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1369                                          tag, errno, strerror(errno));
1370                                 return -1;
1371                         }
1372
1373                         if (!fgets(uuid, sizeof(uuid), fp))
1374                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1375                                          tag, errno, strerror(errno));
1376                         fclose(fp);
1377
1378                         if (*uuid && !strcasecmp(uuid, pr->uuid))
1379                                 return 0;
1380
1381                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1382                                  pr->uuid, basename(path), uuid);
1383                         return -1;
1384                 }
1385         }
1386
1387         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1388         return -1;
1389 }
1390
1391 /*
1392  * Read info about extroot from UCI (using prefix) and mount it.
1393  */
1394 static int mount_extroot(char *cfg)
1395 {
1396         char overlay[] = "/tmp/extroot/overlay";
1397         char mnt[] = "/tmp/extroot/mnt";
1398         char *path = mnt;
1399         struct probe_info *pr;
1400         struct mount *m;
1401         int err = -1;
1402
1403         /* Load @cfg/etc/config/fstab */
1404         if (config_load(cfg))
1405                 return -2;
1406
1407         /* See if there is extroot-specific mount config */
1408         m = find_block(NULL, NULL, NULL, "/");
1409         if (!m)
1410                 m = find_block(NULL, NULL, NULL, "/overlay");
1411
1412         if (!m || !m->extroot)
1413         {
1414                 ULOG_INFO("extroot: not configured\n");
1415                 return -1;
1416         }
1417
1418         /* Find block device pointed by the mount config */
1419         pr = find_block_info(m->uuid, m->label, m->device);
1420
1421         if (!pr && delay_root){
1422                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1423                 sleep(delay_root);
1424                 make_devs();
1425                 cache_load(0);
1426                 pr = find_block_info(m->uuid, m->label, m->device);
1427         }
1428         if (pr) {
1429                 if (strncmp(pr->type, "ext", 3) &&
1430                     strncmp(pr->type, "f2fs", 4) &&
1431                     strncmp(pr->type, "ubifs", 5)) {
1432                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs or ubifs\n", pr->type);
1433                         return -1;
1434                 }
1435
1436                 if (test_fs_support(pr->type)) {
1437                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1438                         return -1;
1439                 }
1440
1441                 if (m->overlay)
1442                         path = overlay;
1443                 mkdir_p(path);
1444
1445                 if (check_fs)
1446                         check_filesystem(pr);
1447
1448                 err = mount(pr->dev, path, pr->type, m->flags,
1449                             (m->options) ? (m->options) : (""));
1450
1451                 if (err) {
1452                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1453                                  pr->dev, pr->type, path, errno, strerror(errno));
1454                 } else if (m->overlay) {
1455                         err = check_extroot(path);
1456                         if (err)
1457                                 umount(path);
1458                 }
1459         } else {
1460                 ULOG_ERR("extroot: cannot find device %s%s\n",
1461                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1462                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1463         }
1464
1465         return err;
1466 }
1467
1468 static int main_extroot(int argc, char **argv)
1469 {
1470         struct probe_info *pr;
1471         char blkdev_path[32] = { 0 };
1472         int err = -1;
1473 #ifdef UBIFS_EXTROOT
1474         libubi_t libubi;
1475 #endif
1476
1477         if (!getenv("PREINIT"))
1478                 return -1;
1479
1480         if (argc != 2) {
1481                 ULOG_ERR("Usage: block extroot\n");
1482                 return -1;
1483         }
1484
1485         make_devs();
1486         cache_load(1);
1487
1488         /* enable LOG_INFO messages */
1489         ulog_threshold(LOG_INFO);
1490
1491         /*
1492          * Look for "rootfs_data". We will want to mount it and check for
1493          * extroot configuration.
1494          */
1495
1496         /* Start with looking for MTD partition */
1497         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1498         if (blkdev_path[0]) {
1499                 pr = find_block_info(NULL, NULL, blkdev_path);
1500                 if (pr && !strcmp(pr->type, "jffs2")) {
1501                         char cfg[] = "/tmp/jffs_cfg";
1502
1503                         /*
1504                          * Mount MTD part and try extroot (using
1505                          * /etc/config/fstab from that partition)
1506                          */
1507                         mkdir_p(cfg);
1508                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1509                                 err = mount_extroot(cfg);
1510                                 umount2(cfg, MNT_DETACH);
1511                         }
1512                         if (err < 0)
1513                                 rmdir("/tmp/overlay");
1514                         rmdir(cfg);
1515                         return err;
1516                 }
1517         }
1518
1519 #ifdef UBIFS_EXTROOT
1520         /* ... but it also could be an UBI volume */
1521         memset(blkdev_path, 0, sizeof(blkdev_path));
1522         libubi = libubi_open();
1523         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1524         libubi_close(libubi);
1525         if (blkdev_path[0]) {
1526                 char cfg[] = "/tmp/ubifs_cfg";
1527
1528                 /* Mount volume and try extroot (using fstab from that vol) */
1529                 mkdir_p(cfg);
1530                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1531                         err = mount_extroot(cfg);
1532                         umount2(cfg, MNT_DETACH);
1533                 }
1534                 if (err < 0)
1535                         rmdir("/tmp/overlay");
1536                 rmdir(cfg);
1537                 return err;
1538        }
1539 #endif
1540
1541         return mount_extroot(NULL);
1542 }
1543
1544 static int main_mount(int argc, char **argv)
1545 {
1546         struct probe_info *pr;
1547
1548         if (config_load(NULL))
1549                 return -1;
1550
1551         cache_load(1);
1552         list_for_each_entry(pr, &devices, list)
1553                 mount_device(pr, TYPE_DEV);
1554
1555         handle_swapfiles(true);
1556
1557         return 0;
1558 }
1559
1560 static int main_umount(int argc, char **argv)
1561 {
1562         struct probe_info *pr;
1563
1564         if (config_load(NULL))
1565                 return -1;
1566
1567         handle_swapfiles(false);
1568
1569         cache_load(0);
1570         list_for_each_entry(pr, &devices, list)
1571                 umount_device(pr);
1572
1573         return 0;
1574 }
1575
1576 static int main_detect(int argc, char **argv)
1577 {
1578         struct probe_info *pr;
1579
1580         cache_load(0);
1581         printf("config 'global'\n");
1582         printf("\toption\tanon_swap\t'0'\n");
1583         printf("\toption\tanon_mount\t'0'\n");
1584         printf("\toption\tauto_swap\t'1'\n");
1585         printf("\toption\tauto_mount\t'1'\n");
1586         printf("\toption\tdelay_root\t'5'\n");
1587         printf("\toption\tcheck_fs\t'0'\n\n");
1588         list_for_each_entry(pr, &devices, list)
1589                 print_block_uci(pr);
1590
1591         return 0;
1592 }
1593
1594 static int main_info(int argc, char **argv)
1595 {
1596         int i;
1597         struct probe_info *pr;
1598
1599         cache_load(1);
1600         if (argc == 2) {
1601                 list_for_each_entry(pr, &devices, list)
1602                         print_block_info(pr);
1603
1604                 return 0;
1605         };
1606
1607         for (i = 2; i < argc; i++) {
1608                 struct stat s;
1609
1610                 if (stat(argv[i], &s)) {
1611                         ULOG_ERR("failed to stat %s\n", argv[i]);
1612                         continue;
1613                 }
1614                 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1615                         ULOG_ERR("%s is not a block device\n", argv[i]);
1616                         continue;
1617                 }
1618                 pr = find_block_info(NULL, NULL, argv[i]);
1619                 if (pr)
1620                         print_block_info(pr);
1621         }
1622
1623         return 0;
1624 }
1625
1626 static int swapon_usage(void)
1627 {
1628         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1629                 "\tStart swapping on [DEVICE]\n"
1630                 " -a\tStart swapping on all swap devices\n"
1631                 " -p pri\tSet priority of swap device\n"
1632                 " -s\tShow summary\n");
1633         return -1;
1634 }
1635
1636 static int main_swapon(int argc, char **argv)
1637 {
1638         int ch;
1639         FILE *fp;
1640         char *lineptr;
1641         size_t s;
1642         struct probe_info *pr;
1643         int flags = 0;
1644         int pri;
1645         struct stat st;
1646         int err;
1647
1648         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1649                 switch(ch) {
1650                 case 's':
1651                         fp = fopen("/proc/swaps", "r");
1652                         lineptr = NULL;
1653
1654                         if (!fp) {
1655                                 ULOG_ERR("failed to open /proc/swaps\n");
1656                                 return -1;
1657                         }
1658                         while (getline(&lineptr, &s, fp) > 0)
1659                                 printf("%s", lineptr);
1660                         if (lineptr)
1661                                 free(lineptr);
1662                         fclose(fp);
1663                         return 0;
1664                 case 'a':
1665                         cache_load(0);
1666                         list_for_each_entry(pr, &devices, list) {
1667                                 if (strcmp(pr->type, "swap"))
1668                                         continue;
1669                                 if (swapon(pr->dev, 0))
1670                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1671                         }
1672                         return 0;
1673                 case 'p':
1674                         pri = atoi(optarg);
1675                         if (pri >= 0)
1676                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1677                         break;
1678                 default:
1679                         return swapon_usage();
1680                 }
1681
1682         }
1683
1684         if (optind != (argc - 1))
1685                 return swapon_usage();
1686
1687         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1688                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1689                 return -1;
1690         }
1691         err = swapon(argv[optind], flags);
1692         if (err) {
1693                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1694                 return err;
1695         }
1696
1697         return 0;
1698 }
1699
1700 static int main_swapoff(int argc, char **argv)
1701 {
1702         if (argc != 2) {
1703                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1704                         "\tStop swapping on DEVICE\n"
1705                         " -a\tStop swapping on all swap devices\n");
1706                 return -1;
1707         }
1708
1709         if (!strcmp(argv[1], "-a")) {
1710                 FILE *fp = fopen("/proc/swaps", "r");
1711                 char line[256];
1712
1713                 if (!fp) {
1714                         ULOG_ERR("failed to open /proc/swaps\n");
1715                         return -1;
1716                 }
1717                 if (fgets(line, sizeof(line), fp))
1718                         while (fgets(line, sizeof(line), fp)) {
1719                                 char *end = strchr(line, ' ');
1720                                 int err;
1721
1722                                 if (!end)
1723                                         continue;
1724                                 *end = '\0';
1725                                 err = swapoff(line);
1726                                 if (err)
1727                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1728                         }
1729                 fclose(fp);
1730         } else {
1731                 struct stat s;
1732                 int err;
1733
1734                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1735                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1736                         return -1;
1737                 }
1738                 err = swapoff(argv[1]);
1739                 if (err) {
1740                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1741                         return err;
1742                 }
1743         }
1744
1745         return 0;
1746 }
1747
1748 int main(int argc, char **argv)
1749 {
1750         char *base = basename(*argv);
1751
1752         umask(0);
1753
1754         ulog_open(-1, -1, "block");
1755         ulog_threshold(LOG_NOTICE);
1756
1757         if (!strcmp(base, "swapon"))
1758                 return main_swapon(argc, argv);
1759
1760         if (!strcmp(base, "swapoff"))
1761                 return main_swapoff(argc, argv);
1762
1763         if ((argc > 1) && !strcmp(base, "block")) {
1764                 if (!strcmp(argv[1], "info"))
1765                         return main_info(argc, argv);
1766
1767                 if (!strcmp(argv[1], "detect"))
1768                         return main_detect(argc, argv);
1769
1770                 if (!strcmp(argv[1], "hotplug"))
1771                         return main_hotplug(argc, argv);
1772
1773                 if (!strcmp(argv[1], "autofs"))
1774                         return main_autofs(argc, argv);
1775
1776                 if (!strcmp(argv[1], "extroot"))
1777                         return main_extroot(argc, argv);
1778
1779                 if (!strcmp(argv[1], "mount"))
1780                         return main_mount(argc, argv);
1781
1782                 if (!strcmp(argv[1], "umount"))
1783                         return main_umount(argc, argv);
1784
1785                 if (!strcmp(argv[1], "remount")) {
1786                         int ret = main_umount(argc, argv);
1787
1788                         if (!ret)
1789                                 ret = main_mount(argc, argv);
1790                         return ret;
1791                 }
1792         }
1793
1794         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1795
1796         return -1;
1797 }