4c8dda92fefac06d2a515564bb8ed5c4f67536b3
[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
26 #include <sys/stat.h>
27 #include <sys/types.h>
28 #include <sys/swap.h>
29 #include <sys/mount.h>
30 #include <sys/wait.h>
31
32 #include <uci.h>
33 #include <uci_blob.h>
34
35 #include <libubox/ulog.h>
36 #include <libubox/list.h>
37 #include <libubox/vlist.h>
38 #include <libubox/blobmsg_json.h>
39 #include <libubox/avl-cmp.h>
40
41 #include "libblkid-tiny/libblkid-tiny.h"
42
43 #ifdef UBIFS_EXTROOT
44 #include "libubi/libubi.h"
45 #endif
46
47 enum {
48         TYPE_MOUNT,
49         TYPE_SWAP,
50 };
51
52 struct mount {
53         struct vlist_node node;
54         int type;
55
56         char *target;
57         char *path;
58         char *options;
59         uint32_t flags;
60         char *uuid;
61         char *label;
62         char *device;
63         int extroot;
64         int overlay;
65         int disabled_fsck;
66         unsigned int prio;
67 };
68
69 static struct vlist_tree mounts;
70 static struct blob_buf b;
71 static LIST_HEAD(devices);
72 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
73 static unsigned int delay_root;
74
75 enum {
76         CFG_ANON_MOUNT,
77         CFG_ANON_SWAP,
78         CFG_AUTO_MOUNT,
79         CFG_AUTO_SWAP,
80         CFG_DELAY_ROOT,
81         CFG_CHECK_FS,
82         __CFG_MAX
83 };
84
85 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
86         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
87         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
88         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
89         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
90         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
91         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
92 };
93
94 enum {
95         MOUNT_UUID,
96         MOUNT_LABEL,
97         MOUNT_ENABLE,
98         MOUNT_TARGET,
99         MOUNT_DEVICE,
100         MOUNT_OPTIONS,
101         __MOUNT_MAX
102 };
103
104 static const struct uci_blob_param_list config_attr_list = {
105         .n_params = __CFG_MAX,
106         .params = config_policy,
107 };
108
109 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
110         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
111         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
112         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
113         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
114         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
115         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
116 };
117
118 static const struct uci_blob_param_list mount_attr_list = {
119         .n_params = __MOUNT_MAX,
120         .params = mount_policy,
121 };
122
123 enum {
124         SWAP_ENABLE,
125         SWAP_UUID,
126         SWAP_LABEL,
127         SWAP_DEVICE,
128         SWAP_PRIO,
129         __SWAP_MAX
130 };
131
132 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
133         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
134         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
135         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
136         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
137         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
138 };
139
140 static const struct uci_blob_param_list swap_attr_list = {
141         .n_params = __SWAP_MAX,
142         .params = swap_policy,
143 };
144
145 struct mount_flag {
146         const char *name;
147         int32_t flag;
148 };
149
150 #ifndef MS_DIRSYNC
151 #       define MS_DIRSYNC               (1 << 7)
152 #endif
153
154 #ifndef MS_RELATIME
155 #       define MS_RELATIME              (1 << 21)
156 #endif
157
158 #ifndef MS_STRICTATIME
159 #       define MS_STRICTATIME   (1 << 24)
160 #endif
161
162 static const struct mount_flag mount_flags[] = {
163         { "sync",               MS_SYNCHRONOUS  },
164         { "async",              ~MS_SYNCHRONOUS },
165         { "dirsync",            MS_DIRSYNC      },
166         { "mand",               MS_MANDLOCK     },
167         { "nomand",             ~MS_MANDLOCK    },
168         { "atime",              ~MS_NOATIME     },
169         { "noatime",            MS_NOATIME      },
170         { "dev",                ~MS_NODEV       },
171         { "nodev",              MS_NODEV        },
172         { "diratime",           ~MS_NODIRATIME  },
173         { "nodiratime",         MS_NODIRATIME   },
174         { "exec",               ~MS_NOEXEC      },
175         { "noexec",             MS_NOEXEC       },
176         { "suid",               ~MS_NOSUID      },
177         { "nosuid",             MS_NOSUID       },
178         { "rw",                 ~MS_RDONLY      },
179         { "ro",                 MS_RDONLY       },
180         { "relatime",           MS_RELATIME     },
181         { "norelatime",         ~MS_RELATIME    },
182         { "strictatime",        MS_STRICTATIME  },
183 };
184
185 static char *blobmsg_get_strdup(struct blob_attr *attr)
186 {
187         if (!attr)
188                 return NULL;
189
190         return strdup(blobmsg_get_string(attr));
191 }
192
193 static char *blobmsg_get_basename(struct blob_attr *attr)
194 {
195         if (!attr)
196                 return NULL;
197
198         return strdup(basename(blobmsg_get_string(attr)));
199 }
200
201 static void parse_mount_options(struct mount *m, char *optstr)
202 {
203         int i;
204         bool is_flag;
205         char *p, *opts, *last;
206
207         m->flags = 0;
208         m->options = NULL;
209
210         if (!optstr || !*optstr)
211                 return;
212
213         m->options = opts = calloc(1, strlen(optstr) + 1);
214
215         if (!m->options)
216                 return;
217
218         p = last = optstr;
219
220         do {
221                 p = strchr(p, ',');
222
223                 if (p)
224                         *p++ = 0;
225
226                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
227                         if (!strcmp(last, mount_flags[i].name)) {
228                                 if (mount_flags[i].flag < 0)
229                                         m->flags &= (uint32_t)mount_flags[i].flag;
230                                 else
231                                         m->flags |= (uint32_t)mount_flags[i].flag;
232                                 is_flag = true;
233                                 break;
234                         }
235                 }
236
237                 if (!is_flag)
238                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
239
240                 last = p;
241
242         } while (p);
243
244         free(optstr);
245 }
246
247 static int mount_add(struct uci_section *s)
248 {
249         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
250         struct mount *m;
251
252         blob_buf_init(&b, 0);
253         uci_to_blob(&b, s, &mount_attr_list);
254         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
255
256         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
257                 return -1;
258
259         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
260                 return -1;
261
262         m = malloc(sizeof(struct mount));
263         m->type = TYPE_MOUNT;
264         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
265         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
266         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
267         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
268
269         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
270
271         m->overlay = m->extroot = 0;
272         if (m->target && !strcmp(m->target, "/"))
273                 m->extroot = 1;
274         if (m->target && !strcmp(m->target, "/overlay"))
275                 m->extroot = m->overlay = 1;
276
277         if (m->target && *m->target != '/') {
278                 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
279                           s->e.name, m->target);
280                 free(m);
281                 return -1;
282         }
283
284         if (m->uuid)
285                 vlist_add(&mounts, &m->node, m->uuid);
286         else if (m->label)
287                 vlist_add(&mounts, &m->node, m->label);
288         else if (m->device)
289                 vlist_add(&mounts, &m->node, m->device);
290
291         return 0;
292 }
293
294 static int swap_add(struct uci_section *s)
295 {
296         struct blob_attr *tb[__SWAP_MAX] = { 0 };
297         struct mount *m;
298
299         blob_buf_init(&b, 0);
300         uci_to_blob(&b, s, &swap_attr_list);
301         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
302
303         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
304                 return -1;
305
306         m = malloc(sizeof(struct mount));
307         memset(m, 0, sizeof(struct mount));
308         m->type = TYPE_SWAP;
309         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
310         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
311         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
312         if (tb[SWAP_PRIO])
313                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
314         if (m->prio)
315                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
316
317         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
318                 /* store complete swap path */
319                 if (tb[SWAP_DEVICE])
320                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
321
322                 if (m->uuid)
323                         vlist_add(&mounts, &m->node, m->uuid);
324                 else if (m->label)
325                         vlist_add(&mounts, &m->node, m->label);
326                 else if (m->device)
327                         vlist_add(&mounts, &m->node, m->device);
328         }
329
330         return 0;
331 }
332
333 static int global_add(struct uci_section *s)
334 {
335         struct blob_attr *tb[__CFG_MAX] = { 0 };
336
337         blob_buf_init(&b, 0);
338         uci_to_blob(&b, s, &config_attr_list);
339         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
340
341         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
342                 anon_mount = 1;
343         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
344                 anon_swap = 1;
345
346         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
347                 auto_mount = 1;
348         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
349                 auto_swap = 1;
350
351         if (tb[CFG_DELAY_ROOT])
352                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
353
354         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
355                 check_fs = 1;
356
357         return 0;
358 }
359
360 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
361 {
362         struct mount *m;
363
364         vlist_for_each_element(&mounts, m, node) {
365                 if (m->type != TYPE_SWAP)
366                         continue;
367                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
368                         return m;
369                 if (label && m->label && !strcmp(m->label, label))
370                         return m;
371                 if (device && m->device && !strcmp(m->device, device))
372                         return m;
373         }
374
375         return NULL;
376 }
377
378 static struct mount* find_block(const char *uuid, const char *label, const char *device,
379                                 const char *target)
380 {
381         struct mount *m;
382
383         vlist_for_each_element(&mounts, m, node) {
384                 if (m->type != TYPE_MOUNT)
385                         continue;
386                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
387                         return m;
388                 if (m->label && label && !strcmp(m->label, label))
389                         return m;
390                 if (m->target && target && !strcmp(m->target, target))
391                         return m;
392                 if (m->device && device && !strcmp(m->device, device))
393                         return m;
394         }
395
396         return NULL;
397 }
398
399 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
400                           struct vlist_node *node_old)
401 {
402 }
403
404 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
405 {
406         char *file = basename(path);
407         char *dir = dirname(path);
408         char *err;
409         struct uci_package *pkg;
410
411         uci_set_confdir(ctx, dir);
412         ULOG_INFO("attempting to load %s/%s\n", dir, file);
413
414         if (uci_load(ctx, file, &pkg)) {
415                 uci_get_errorstr(ctx, &err, file);
416                 ULOG_ERR("unable to load configuration (%s)\n", err);
417
418                 free(err);
419                 return NULL;
420         }
421
422         return pkg;
423 }
424
425 static int config_load(char *cfg)
426 {
427         struct uci_context *ctx = uci_alloc_context();
428         struct uci_package *pkg = NULL;
429         struct uci_element *e;
430         char path[64];
431
432         vlist_init(&mounts, avl_strcmp, mounts_update);
433
434         if (cfg) {
435                 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
436                 pkg = config_try_load(ctx, path);
437
438                 if (!pkg) {
439                         snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
440                         pkg = config_try_load(ctx, path);
441                 }
442         }
443
444         if (!pkg) {
445                 snprintf(path, sizeof(path), "/etc/config/fstab");
446                 pkg = config_try_load(ctx, path);
447         }
448
449         if (!pkg) {
450                 ULOG_ERR("no usable configuration\n");
451                 return -1;
452         }
453
454         vlist_update(&mounts);
455         uci_foreach_element(&pkg->sections, e) {
456                 struct uci_section *s = uci_to_section(e);
457
458                 if (!strcmp(s->type, "mount"))
459                         mount_add(s);
460                 if (!strcmp(s->type, "swap"))
461                         swap_add(s);
462                 if (!strcmp(s->type, "global"))
463                         global_add(s);
464         }
465         vlist_flush(&mounts);
466
467         return 0;
468 }
469
470 static struct blkid_struct_probe* _probe_path(char *path)
471 {
472         struct blkid_struct_probe *pr;
473
474         pr = malloc(sizeof(*pr));
475
476         if (!pr)
477                 return NULL;
478
479         memset(pr, 0, sizeof(*pr));
480         probe_block(path, pr);
481
482         if (pr->err || !pr->id) {
483                 free(pr);
484                 return NULL;
485         }
486
487         return pr;
488 }
489
490 static int _cache_load(const char *path)
491 {
492         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
493         int j;
494         glob_t gl;
495
496         if (glob(path, gl_flags, NULL, &gl) < 0)
497                 return -1;
498
499         for (j = 0; j < gl.gl_pathc; j++) {
500                 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
501                 if (pr)
502                         list_add_tail(&pr->list, &devices);
503         }
504
505         globfree(&gl);
506
507         return 0;
508 }
509
510 static void cache_load(int mtd)
511 {
512         if (mtd) {
513                 _cache_load("/dev/mtdblock*");
514                 _cache_load("/dev/ubiblock*");
515                 _cache_load("/dev/ubi?*_?*");
516         }
517         _cache_load("/dev/mmcblk*");
518         _cache_load("/dev/sd*");
519         _cache_load("/dev/hd*");
520         _cache_load("/dev/md*");
521         _cache_load("/dev/vd*");
522         _cache_load("/dev/mapper/*");
523 }
524
525 static int print_block_info(struct blkid_struct_probe *pr)
526 {
527         printf("%s:", pr->dev);
528         if (pr->uuid[0])
529                 printf(" UUID=\"%s\"", pr->uuid);
530
531         if (pr->label[0])
532                 printf(" LABEL=\"%s\"", pr->label);
533
534         if (pr->name[0])
535                 printf(" NAME=\"%s\"", pr->name);
536
537         if (pr->version[0])
538                 printf(" VERSION=\"%s\"", pr->version);
539
540         printf(" TYPE=\"%s\"\n", pr->id->name);
541
542         return 0;
543 }
544
545 static int print_block_uci(struct blkid_struct_probe *pr)
546 {
547         if (!strcmp(pr->id->name, "swap")) {
548                 printf("config 'swap'\n");
549         } else {
550                 printf("config 'mount'\n");
551                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
552         }
553         if (pr->uuid[0])
554                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
555         else
556                 printf("\toption\tdevice\t'%s'\n", pr->dev);
557         printf("\toption\tenabled\t'0'\n\n");
558
559         return 0;
560 }
561
562 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
563 {
564         struct blkid_struct_probe *pr = NULL;
565
566         if (uuid)
567                 list_for_each_entry(pr, &devices, list)
568                         if (!strcasecmp(pr->uuid, uuid))
569                                 return pr;
570
571         if (label)
572                 list_for_each_entry(pr, &devices, list)
573                         if (!strcmp(pr->label, label))
574                                 return pr;
575
576         if (path)
577                 list_for_each_entry(pr, &devices, list)
578                         if (!strcmp(basename(pr->dev), basename(path)))
579                                 return pr;
580
581         return NULL;
582 }
583
584 static char* find_mount_point(char *block)
585 {
586         FILE *fp = fopen("/proc/mounts", "r");
587         static char line[256];
588         int len = strlen(block);
589         char *point = NULL;
590
591         if(!fp)
592                 return NULL;
593
594         while (fgets(line, sizeof(line), fp)) {
595                 if (!strncmp(line, block, len)) {
596                         char *p = &line[len + 1];
597                         char *t = strstr(p, " ");
598
599                         if (!t) {
600                                 fclose(fp);
601                                 return NULL;
602                         }
603                         *t = '\0';
604                         point = p;
605                         break;
606                 }
607         }
608
609         fclose(fp);
610
611         return point;
612 }
613
614 static void mkdir_p(char *dir)
615 {
616         char *l = strrchr(dir, '/');
617
618         if (l) {
619                 *l = '\0';
620                 mkdir_p(dir);
621                 *l = '/';
622                 mkdir(dir, 0755);
623         }
624 }
625
626 static void check_filesystem(struct blkid_struct_probe *pr)
627 {
628         pid_t pid;
629         struct stat statbuf;
630         char *e2fsck = "/usr/sbin/e2fsck";
631
632         /* UBIFS does not need stuff like fsck */
633         if (!strncmp(pr->id->name, "ubifs", 5))
634                 return;
635
636         if (strncmp(pr->id->name, "ext", 3)) {
637                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->id->name);
638                 return;
639         }
640
641         if (stat(e2fsck, &statbuf) < 0) {
642                 ULOG_ERR("check_filesystem: %s not found\n", e2fsck);
643                 return;
644         }
645
646         pid = fork();
647         if (!pid) {
648                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
649                 exit(-1);
650         } else if (pid > 0) {
651                 int status;
652
653                 waitpid(pid, &status, 0);
654                 if (WEXITSTATUS(status))
655                         ULOG_ERR("check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
656         }
657 }
658
659 static void handle_swapfiles(bool on)
660 {
661         struct stat s;
662         struct mount *m;
663         struct blkid_struct_probe *pr;
664
665         vlist_for_each_element(&mounts, m, node)
666         {
667                 if (m->type != TYPE_SWAP || !m->target)
668                         continue;
669
670                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
671                         continue;
672
673                 pr = _probe_path(m->target);
674
675                 if (!pr)
676                         continue;
677
678                 if (!strcmp(pr->id->name, "swap")) {
679                         if (on)
680                                 swapon(pr->dev, m->prio);
681                         else
682                                 swapoff(pr->dev);
683                 }
684
685                 free(pr);
686         }
687 }
688
689 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
690 {
691         struct mount *m;
692         char *device;
693
694         if (!pr)
695                 return -1;
696
697         device = basename(pr->dev);
698
699         if (!strcmp(pr->id->name, "swap")) {
700                 if (hotplug && !auto_swap)
701                         return -1;
702                 m = find_swap(pr->uuid, pr->label, device);
703                 if (m || anon_swap)
704                         swapon(pr->dev, (m) ? (m->prio) : (0));
705
706                 return 0;
707         }
708
709         if (hotplug && !auto_mount)
710                 return -1;
711
712         if (find_mount_point(pr->dev)) {
713                 ULOG_ERR("%s is already mounted\n", pr->dev);
714                 return -1;
715         }
716
717         m = find_block(pr->uuid, pr->label, device, NULL);
718         if (m && m->extroot)
719                 return -1;
720
721         if (m) {
722                 char *target = m->target;
723                 char _target[32];
724                 int err = 0;
725
726                 if (!target) {
727                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
728                         target = _target;
729                 }
730                 mkdir_p(target);
731
732                 if (check_fs)
733                         check_filesystem(pr);
734
735                 err = mount(pr->dev, target, pr->id->name, m->flags,
736                             (m->options) ? (m->options) : (""));
737                 if (err)
738                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
739                                  pr->dev, pr->id->name, target, err, strerror(err));
740                 else
741                         handle_swapfiles(true);
742                 return err;
743         }
744
745         if (anon_mount) {
746                 char target[] = "/mnt/mmcblk123";
747                 int err = 0;
748
749                 snprintf(target, sizeof(target), "/mnt/%s", device);
750                 mkdir_p(target);
751
752                 if (check_fs)
753                         check_filesystem(pr);
754
755                 err = mount(pr->dev, target, pr->id->name, 0, "");
756                 if (err)
757                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
758                                  pr->dev, pr->id->name, target, err, strerror(err));
759                 else
760                         handle_swapfiles(true);
761                 return err;
762         }
763
764         return 0;
765 }
766
767 static int umount_device(struct blkid_struct_probe *pr)
768 {
769         struct mount *m;
770         char *device = basename(pr->dev);
771         char *mp;
772         int err;
773
774         if (!pr)
775                 return -1;
776
777         if (!strcmp(pr->id->name, "swap"))
778                 return -1;
779
780         mp = find_mount_point(pr->dev);
781         if (!mp)
782                 return -1;
783
784         m = find_block(pr->uuid, pr->label, device, NULL);
785         if (m && m->extroot)
786                 return -1;
787
788         err = umount2(mp, MNT_DETACH);
789         if (err)
790                 ULOG_ERR("unmounting %s (%s)  failed (%d) - %s\n",
791                          pr->dev, mp, err, strerror(err));
792         else
793                 ULOG_INFO("unmounted %s (%s)\n",
794                           pr->dev, mp);
795
796         return err;
797 }
798
799 static int main_hotplug(int argc, char **argv)
800 {
801         char path[32];
802         char *action, *device, *mount_point;
803
804         action = getenv("ACTION");
805         device = getenv("DEVNAME");
806
807         if (!action || !device)
808                 return -1;
809         snprintf(path, sizeof(path), "/dev/%s", device);
810
811         if (!strcmp(action, "remove")) {
812                 int err = 0;
813                 mount_point = find_mount_point(path);
814                 if (mount_point)
815                         err = umount2(mount_point, MNT_DETACH);
816
817                 if (err)
818                         ULOG_ERR("umount of %s failed (%d) - %s\n",
819                                  mount_point, err, strerror(err));
820
821                 return 0;
822         } else if (strcmp(action, "add")) {
823                 ULOG_ERR("Unkown action %s\n", action);
824
825                 return -1;
826         }
827
828         if (config_load(NULL))
829                 return -1;
830         cache_load(0);
831
832         return mount_device(find_block_info(NULL, NULL, path), 1);
833 }
834
835 static int find_block_mtd(char *name, char *part, int plen)
836 {
837         FILE *fp = fopen("/proc/mtd", "r");
838         static char line[256];
839         char *index = NULL;
840
841         if(!fp)
842                 return -1;
843
844         while (!index && fgets(line, sizeof(line), fp)) {
845                 if (strstr(line, name)) {
846                         char *eol = strstr(line, ":");
847
848                         if (!eol)
849                                 continue;
850
851                         *eol = '\0';
852                         index = &line[3];
853                 }
854         }
855
856         fclose(fp);
857
858         if (!index)
859                 return -1;
860
861         snprintf(part, plen, "/dev/mtdblock%s", index);
862
863         return 0;
864 }
865
866 #ifdef UBIFS_EXTROOT
867 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
868 {
869         int dev = 0;
870
871         while (ubi_dev_present(libubi, dev))
872         {
873                 struct ubi_dev_info dev_info;
874                 struct ubi_vol_info vol_info;
875
876                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
877                         continue;
878                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
879                         continue;
880
881                 *dev_num = dev_info.dev_num;
882                 *vol_id = vol_info.vol_id;
883
884                 return 0;
885         }
886
887         return -1;
888 }
889
890 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
891 {
892         int dev_num;
893         int vol_id;
894         int err = -1;
895
896         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
897         if (!err)
898                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
899
900         return err;
901 }
902
903 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
904 {
905         int dev_num;
906         int vol_id;
907         int err = -1;
908
909         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
910         if (!err)
911                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
912
913         return err;
914 }
915
916 #else
917
918 static int find_root_dev(char *buf, int len)
919 {
920         DIR *d;
921         dev_t root;
922         struct stat s;
923         struct dirent *e;
924
925         if (stat("/", &s))
926                 return -1;
927
928         if (!(d = opendir("/dev")))
929                 return -1;
930
931         root = s.st_dev;
932
933         while ((e = readdir(d)) != NULL) {
934                 snprintf(buf, len, "/dev/%s", e->d_name);
935
936                 if (stat(buf, &s) || s.st_rdev != root)
937                         continue;
938
939                 closedir(d);
940                 return 0;
941         }
942
943         closedir(d);
944         return -1;
945 }
946
947 #endif
948
949 static int test_fs_support(const char *name)
950 {
951         char line[128], *p;
952         int rv = -1;
953         FILE *f;
954
955         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
956                 while (fgets(line, sizeof(line), f)) {
957                         p = strtok(line, "\t\n");
958
959                         if (p && !strcmp(p, "nodev"))
960                                 p = strtok(NULL, "\t\n");
961
962                         if (p && !strcmp(p, name)) {
963                                 rv = 0;
964                                 break;
965                         }
966                 }
967                 fclose(f);
968         }
969
970         return rv;
971 }
972
973 static int check_extroot(char *path)
974 {
975         struct blkid_struct_probe *pr = NULL;
976         char devpath[32];
977
978 #ifdef UBIFS_EXTROOT
979         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
980                 int err = -1;
981                 libubi_t libubi;
982
983                 libubi = libubi_open();
984                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
985                 libubi_close(libubi);
986                 if (err)
987                         return -1;
988         }
989 #else
990         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
991                 if (find_root_dev(devpath, sizeof(devpath))) {
992                         ULOG_ERR("extroot: unable to determine root device\n");
993                         return -1;
994                 }
995         }
996 #endif
997
998         list_for_each_entry(pr, &devices, list) {
999                 if (!strcmp(pr->dev, devpath)) {
1000                         struct stat s;
1001                         FILE *fp = NULL;
1002                         char tag[64];
1003                         char uuid[64] = { 0 };
1004
1005                         snprintf(tag, sizeof(tag), "%s/etc", path);
1006                         if (stat(tag, &s))
1007                                 mkdir_p(tag);
1008
1009                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1010                         if (stat(tag, &s)) {
1011                                 fp = fopen(tag, "w+");
1012                                 if (!fp) {
1013                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1014                                                  tag, errno, strerror(errno));
1015                                         /* return 0 to continue boot regardless of error */
1016                                         return 0;
1017                                 }
1018                                 fputs(pr->uuid, fp);
1019                                 fclose(fp);
1020                                 return 0;
1021                         }
1022
1023                         fp = fopen(tag, "r");
1024                         if (!fp) {
1025                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1026                                          tag, errno, strerror(errno));
1027                                 return -1;
1028                         }
1029
1030                         if (!fgets(uuid, sizeof(uuid), fp))
1031                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1032                                          tag, errno, strerror(errno));
1033                         fclose(fp);
1034
1035                         if (*uuid || !strcasecmp(uuid, pr->uuid))
1036                                 return 0;
1037
1038                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1039                                  pr->uuid, basename(path), uuid);
1040                         return -1;
1041                 }
1042         }
1043
1044         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1045         return -1;
1046 }
1047
1048 /*
1049  * Read info about extroot from UCI (using prefix) and mount it.
1050  */
1051 static int mount_extroot(char *cfg)
1052 {
1053         char overlay[] = "/tmp/extroot/overlay";
1054         char mnt[] = "/tmp/extroot/mnt";
1055         char *path = mnt;
1056         struct blkid_struct_probe *pr;
1057         struct mount *m;
1058         int err = -1;
1059
1060         /* Load @cfg/etc/config/fstab */
1061         if (config_load(cfg))
1062                 return -2;
1063
1064         /* See if there is extroot-specific mount config */
1065         m = find_block(NULL, NULL, NULL, "/");
1066         if (!m)
1067                 m = find_block(NULL, NULL, NULL, "/overlay");
1068
1069         if (!m || !m->extroot)
1070         {
1071                 ULOG_INFO("extroot: not configured\n");
1072                 return -1;
1073         }
1074
1075         /* Find block device pointed by the mount config */
1076         pr = find_block_info(m->uuid, m->label, m->device);
1077
1078         if (!pr && delay_root){
1079                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1080                 sleep(delay_root);
1081                 mkblkdev();
1082                 cache_load(0);
1083                 pr = find_block_info(m->uuid, m->label, m->device);
1084         }
1085         if (pr) {
1086                 if (strncmp(pr->id->name, "ext", 3) &&
1087                     strncmp(pr->id->name, "ubifs", 5)) {
1088                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4\n", pr->id->name);
1089                         return -1;
1090                 }
1091
1092                 if (test_fs_support(pr->id->name)) {
1093                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->id->name);
1094                         return -1;
1095                 }
1096
1097                 if (m->overlay)
1098                         path = overlay;
1099                 mkdir_p(path);
1100
1101                 if (check_fs)
1102                         check_filesystem(pr);
1103
1104                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
1105
1106                 if (err) {
1107                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1108                                  pr->dev, pr->id->name, path, err, strerror(err));
1109                 } else if (m->overlay) {
1110                         err = check_extroot(path);
1111                         if (err)
1112                                 umount(path);
1113                 }
1114         } else {
1115                 ULOG_ERR("extroot: cannot find device %s%s\n",
1116                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1117                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1118         }
1119
1120         return err;
1121 }
1122
1123 static int main_extroot(int argc, char **argv)
1124 {
1125         struct blkid_struct_probe *pr;
1126         char blkdev_path[32] = { 0 };
1127         int err = -1;
1128 #ifdef UBIFS_EXTROOT
1129         libubi_t libubi;
1130 #endif
1131
1132         if (!getenv("PREINIT"))
1133                 return -1;
1134
1135         if (argc != 2) {
1136                 ULOG_ERR("Usage: block extroot\n");
1137                 return -1;
1138         }
1139
1140         mkblkdev();
1141         cache_load(1);
1142
1143         /* enable LOG_INFO messages */
1144         ulog_threshold(LOG_INFO);
1145
1146         /*
1147          * Look for "rootfs_data". We will want to mount it and check for
1148          * extroot configuration.
1149          */
1150
1151         /* Start with looking for MTD partition */
1152         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1153         if (blkdev_path[0]) {
1154                 pr = find_block_info(NULL, NULL, blkdev_path);
1155                 if (pr && !strcmp(pr->id->name, "jffs2")) {
1156                         char cfg[] = "/tmp/jffs_cfg";
1157
1158                         /*
1159                          * Mount MTD part and try extroot (using
1160                          * /etc/config/fstab from that partition)
1161                          */
1162                         mkdir_p(cfg);
1163                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1164                                 err = mount_extroot(cfg);
1165                                 umount2(cfg, MNT_DETACH);
1166                         }
1167                         if (err < 0)
1168                                 rmdir("/tmp/overlay");
1169                         rmdir(cfg);
1170                         return err;
1171                 }
1172         }
1173
1174 #ifdef UBIFS_EXTROOT
1175         /* ... but it also could be an UBI volume */
1176         memset(blkdev_path, 0, sizeof(blkdev_path));
1177         libubi = libubi_open();
1178         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1179         libubi_close(libubi);
1180         if (blkdev_path[0]) {
1181                 char cfg[] = "/tmp/ubifs_cfg";
1182
1183                 /* Mount volume and try extroot (using fstab from that vol) */
1184                 mkdir_p(cfg);
1185                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1186                         err = mount_extroot(cfg);
1187                         umount2(cfg, MNT_DETACH);
1188                 }
1189                 if (err < 0)
1190                         rmdir("/tmp/overlay");
1191                 rmdir(cfg);
1192                 return err;
1193        }
1194 #endif
1195
1196         return mount_extroot(NULL);
1197 }
1198
1199 static int main_mount(int argc, char **argv)
1200 {
1201         struct blkid_struct_probe *pr;
1202
1203         if (config_load(NULL))
1204                 return -1;
1205
1206         cache_load(1);
1207         list_for_each_entry(pr, &devices, list)
1208                 mount_device(pr, 0);
1209
1210         handle_swapfiles(true);
1211
1212         return 0;
1213 }
1214
1215 static int main_umount(int argc, char **argv)
1216 {
1217         struct blkid_struct_probe *pr;
1218
1219         if (config_load(NULL))
1220                 return -1;
1221
1222         handle_swapfiles(false);
1223
1224         cache_load(0);
1225         list_for_each_entry(pr, &devices, list)
1226                 umount_device(pr);
1227
1228         return 0;
1229 }
1230
1231 static int main_detect(int argc, char **argv)
1232 {
1233         struct blkid_struct_probe *pr;
1234
1235         cache_load(0);
1236         printf("config 'global'\n");
1237         printf("\toption\tanon_swap\t'0'\n");
1238         printf("\toption\tanon_mount\t'0'\n");
1239         printf("\toption\tauto_swap\t'1'\n");
1240         printf("\toption\tauto_mount\t'1'\n");
1241         printf("\toption\tdelay_root\t'5'\n");
1242         printf("\toption\tcheck_fs\t'0'\n\n");
1243         list_for_each_entry(pr, &devices, list)
1244                 print_block_uci(pr);
1245
1246         return 0;
1247 }
1248
1249 static int main_info(int argc, char **argv)
1250 {
1251         int i;
1252         struct blkid_struct_probe *pr;
1253
1254         cache_load(1);
1255         if (argc == 2) {
1256                 list_for_each_entry(pr, &devices, list)
1257                         print_block_info(pr);
1258
1259                 return 0;
1260         };
1261
1262         for (i = 2; i < argc; i++) {
1263                 struct stat s;
1264
1265                 if (stat(argv[i], &s)) {
1266                         ULOG_ERR("failed to stat %s\n", argv[i]);
1267                         continue;
1268                 }
1269                 if (!S_ISBLK(s.st_mode)) {
1270                         ULOG_ERR("%s is not a block device\n", argv[i]);
1271                         continue;
1272                 }
1273                 pr = find_block_info(NULL, NULL, argv[i]);
1274                 if (pr)
1275                         print_block_info(pr);
1276         }
1277
1278         return 0;
1279 }
1280
1281 static int swapon_usage(void)
1282 {
1283         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1284                 "\tStart swapping on [DEVICE]\n"
1285                 " -a\tStart swapping on all swap devices\n"
1286                 " -p pri\tSet priority of swap device\n"
1287                 " -s\tShow summary\n");
1288         return -1;
1289 }
1290
1291 static int main_swapon(int argc, char **argv)
1292 {
1293         int ch;
1294         FILE *fp;
1295         char *lineptr;
1296         size_t s;
1297         struct blkid_struct_probe *pr;
1298         int flags = 0;
1299         int pri;
1300         struct stat st;
1301         int err;
1302
1303         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1304                 switch(ch) {
1305                 case 's':
1306                         fp = fopen("/proc/swaps", "r");
1307                         lineptr = NULL;
1308
1309                         if (!fp) {
1310                                 ULOG_ERR("failed to open /proc/swaps\n");
1311                                 return -1;
1312                         }
1313                         while (getline(&lineptr, &s, fp) > 0)
1314                                 printf(lineptr);
1315                         if (lineptr)
1316                                 free(lineptr);
1317                         fclose(fp);
1318                         return 0;
1319                 case 'a':
1320                         cache_load(0);
1321                         list_for_each_entry(pr, &devices, list) {
1322                                 if (strcmp(pr->id->name, "swap"))
1323                                         continue;
1324                                 if (swapon(pr->dev, 0))
1325                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1326                         }
1327                         return 0;
1328                 case 'p':
1329                         pri = atoi(optarg);
1330                         if (pri >= 0)
1331                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1332                         break;
1333                 default:
1334                         return swapon_usage();
1335                 }
1336
1337         }
1338
1339         if (optind != (argc - 1))
1340                 return swapon_usage();
1341
1342         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1343                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1344                 return -1;
1345         }
1346         err = swapon(argv[optind], flags);
1347         if (err) {
1348                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1349                 return err;
1350         }
1351
1352         return 0;
1353 }
1354
1355 static int main_swapoff(int argc, char **argv)
1356 {
1357         if (argc != 2) {
1358                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1359                         "\tStop swapping on DEVICE\n"
1360                         " -a\tStop swapping on all swap devices\n");
1361                 return -1;
1362         }
1363
1364         if (!strcmp(argv[1], "-a")) {
1365                 FILE *fp = fopen("/proc/swaps", "r");
1366                 char line[256];
1367
1368                 if (!fp) {
1369                         ULOG_ERR("failed to open /proc/swaps\n");
1370                         return -1;
1371                 }
1372                 if (fgets(line, sizeof(line), fp))
1373                         while (fgets(line, sizeof(line), fp)) {
1374                                 char *end = strchr(line, ' ');
1375                                 int err;
1376
1377                                 if (!end)
1378                                         continue;
1379                                 *end = '\0';
1380                                 err = swapoff(line);
1381                                 if (err)
1382                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1383                         }
1384                 fclose(fp);
1385         } else {
1386                 struct stat s;
1387                 int err;
1388
1389                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1390                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1391                         return -1;
1392                 }
1393                 err = swapoff(argv[1]);
1394                 if (err) {
1395                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1396                         return err;
1397                 }
1398         }
1399
1400         return 0;
1401 }
1402
1403 int main(int argc, char **argv)
1404 {
1405         char *base = basename(*argv);
1406
1407         umask(0);
1408
1409         ulog_open(-1, -1, "block");
1410         ulog_threshold(LOG_NOTICE);
1411
1412         if (!strcmp(base, "swapon"))
1413                 return main_swapon(argc, argv);
1414
1415         if (!strcmp(base, "swapoff"))
1416                 return main_swapoff(argc, argv);
1417
1418         if ((argc > 1) && !strcmp(base, "block")) {
1419                 if (!strcmp(argv[1], "info"))
1420                         return main_info(argc, argv);
1421
1422                 if (!strcmp(argv[1], "detect"))
1423                         return main_detect(argc, argv);
1424
1425                 if (!strcmp(argv[1], "hotplug"))
1426                         return main_hotplug(argc, argv);
1427
1428                 if (!strcmp(argv[1], "extroot"))
1429                         return main_extroot(argc, argv);
1430
1431                 if (!strcmp(argv[1], "mount"))
1432                         return main_mount(argc, argv);
1433
1434                 if (!strcmp(argv[1], "umount"))
1435                         return main_umount(argc, argv);
1436         }
1437
1438         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1439
1440         return -1;
1441 }