/* * Copyright (C) 2013 Felix Fietkau * Copyright (C) 2013 John Crispin * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License version 2.1 * as published by the Free Software Foundation * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "probe.h" #define AUTOFS_MOUNT_PATH "/tmp/run/blockd/" #ifdef UBIFS_EXTROOT #include "libubi/libubi.h" #endif enum { TYPE_MOUNT, TYPE_SWAP, }; enum { TYPE_DEV, TYPE_HOTPLUG, TYPE_AUTOFS, }; struct mount { struct vlist_node node; int type; char *target; char *path; char *options; uint32_t flags; char *uuid; char *label; char *device; int extroot; int autofs; int overlay; int disabled_fsck; unsigned int prio; }; static struct vlist_tree mounts; static struct blob_buf b; static LIST_HEAD(devices); static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs; static unsigned int delay_root; enum { CFG_ANON_MOUNT, CFG_ANON_SWAP, CFG_AUTO_MOUNT, CFG_AUTO_SWAP, CFG_DELAY_ROOT, CFG_CHECK_FS, __CFG_MAX }; static const struct blobmsg_policy config_policy[__CFG_MAX] = { [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 }, [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 }, [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 }, [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 }, [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 }, [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 }, }; enum { MOUNT_UUID, MOUNT_LABEL, MOUNT_ENABLE, MOUNT_TARGET, MOUNT_DEVICE, MOUNT_OPTIONS, MOUNT_AUTOFS, __MOUNT_MAX }; static const struct uci_blob_param_list config_attr_list = { .n_params = __CFG_MAX, .params = config_policy, }; static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = { [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING }, [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING }, [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING }, [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING }, [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING }, [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 }, [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 }, }; static const struct uci_blob_param_list mount_attr_list = { .n_params = __MOUNT_MAX, .params = mount_policy, }; enum { SWAP_ENABLE, SWAP_UUID, SWAP_LABEL, SWAP_DEVICE, SWAP_PRIO, __SWAP_MAX }; static const struct blobmsg_policy swap_policy[__SWAP_MAX] = { [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 }, [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING }, [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING }, [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING }, [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 }, }; static const struct uci_blob_param_list swap_attr_list = { .n_params = __SWAP_MAX, .params = swap_policy, }; struct mount_flag { const char *name; int32_t flag; }; static const struct mount_flag mount_flags[] = { { "sync", MS_SYNCHRONOUS }, { "async", ~MS_SYNCHRONOUS }, { "dirsync", MS_DIRSYNC }, { "mand", MS_MANDLOCK }, { "nomand", ~MS_MANDLOCK }, { "atime", ~MS_NOATIME }, { "noatime", MS_NOATIME }, { "dev", ~MS_NODEV }, { "nodev", MS_NODEV }, { "diratime", ~MS_NODIRATIME }, { "nodiratime", MS_NODIRATIME }, { "exec", ~MS_NOEXEC }, { "noexec", MS_NOEXEC }, { "suid", ~MS_NOSUID }, { "nosuid", MS_NOSUID }, { "rw", ~MS_RDONLY }, { "ro", MS_RDONLY }, { "relatime", MS_RELATIME }, { "norelatime", ~MS_RELATIME }, { "strictatime", MS_STRICTATIME }, { "acl", MS_POSIXACL }, { "noacl", ~MS_POSIXACL }, { "nouser_xattr", MS_NOUSER }, { "user_xattr", ~MS_NOUSER }, }; static char *blobmsg_get_strdup(struct blob_attr *attr) { if (!attr) return NULL; return strdup(blobmsg_get_string(attr)); } static char *blobmsg_get_basename(struct blob_attr *attr) { if (!attr) return NULL; return strdup(basename(blobmsg_get_string(attr))); } static void parse_mount_options(struct mount *m, char *optstr) { int i; bool is_flag; char *p, *opts, *last; m->flags = 0; m->options = NULL; if (!optstr || !*optstr) return; m->options = opts = calloc(1, strlen(optstr) + 1); if (!m->options) return; p = last = optstr; do { p = strchr(p, ','); if (p) *p++ = 0; for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) { if (!strcmp(last, mount_flags[i].name)) { if (mount_flags[i].flag < 0) m->flags &= (uint32_t)mount_flags[i].flag; else m->flags |= (uint32_t)mount_flags[i].flag; is_flag = true; break; } } if (!is_flag) opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last); last = p; } while (p); free(optstr); } static int mount_add(struct uci_section *s) { struct blob_attr *tb[__MOUNT_MAX] = { 0 }; struct mount *m; blob_buf_init(&b, 0); uci_to_blob(&b, s, &mount_attr_list); blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head)); if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE]) return -1; if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE])) return -1; m = malloc(sizeof(struct mount)); m->type = TYPE_MOUNT; m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]); m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]); m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]); m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]); if (tb[MOUNT_AUTOFS]) m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]); else m->autofs = 0; parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS])); m->overlay = m->extroot = 0; if (m->target && !strcmp(m->target, "/")) m->extroot = 1; if (m->target && !strcmp(m->target, "/overlay")) m->extroot = m->overlay = 1; if (m->target && *m->target != '/') { ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n", s->e.name, m->target); free(m); return -1; } if (m->uuid) vlist_add(&mounts, &m->node, m->uuid); else if (m->label) vlist_add(&mounts, &m->node, m->label); else if (m->device) vlist_add(&mounts, &m->node, m->device); return 0; } static int swap_add(struct uci_section *s) { struct blob_attr *tb[__SWAP_MAX] = { 0 }; struct mount *m; blob_buf_init(&b, 0); uci_to_blob(&b, s, &swap_attr_list); blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head)); if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE]) return -1; m = malloc(sizeof(struct mount)); memset(m, 0, sizeof(struct mount)); m->type = TYPE_SWAP; m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]); m->label = blobmsg_get_strdup(tb[SWAP_LABEL]); m->device = blobmsg_get_basename(tb[SWAP_DEVICE]); if (tb[SWAP_PRIO]) m->prio = blobmsg_get_u32(tb[SWAP_PRIO]); if (m->prio) m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER; if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) { /* store complete swap path */ if (tb[SWAP_DEVICE]) m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]); if (m->uuid) vlist_add(&mounts, &m->node, m->uuid); else if (m->label) vlist_add(&mounts, &m->node, m->label); else if (m->device) vlist_add(&mounts, &m->node, m->device); } return 0; } static int global_add(struct uci_section *s) { struct blob_attr *tb[__CFG_MAX] = { 0 }; blob_buf_init(&b, 0); uci_to_blob(&b, s, &config_attr_list); blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head)); if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT])) anon_mount = 1; if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP])) anon_swap = 1; if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT])) auto_mount = 1; if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP])) auto_swap = 1; if (tb[CFG_DELAY_ROOT]) delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]); if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS])) check_fs = 1; return 0; } static struct mount* find_swap(const char *uuid, const char *label, const char *device) { struct mount *m; vlist_for_each_element(&mounts, m, node) { if (m->type != TYPE_SWAP) continue; if (uuid && m->uuid && !strcasecmp(m->uuid, uuid)) return m; if (label && m->label && !strcmp(m->label, label)) return m; if (device && m->device && !strcmp(m->device, device)) return m; } return NULL; } static struct mount* find_block(const char *uuid, const char *label, const char *device, const char *target) { struct mount *m; vlist_for_each_element(&mounts, m, node) { if (m->type != TYPE_MOUNT) continue; if (m->uuid && uuid && !strcasecmp(m->uuid, uuid)) return m; if (m->label && label && !strcmp(m->label, label)) return m; if (m->target && target && !strcmp(m->target, target)) return m; if (m->device && device && !strcmp(m->device, device)) return m; } return NULL; } static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new, struct vlist_node *node_old) { } static struct uci_package * config_try_load(struct uci_context *ctx, char *path) { char *file = basename(path); char *dir = dirname(path); char *err; struct uci_package *pkg; uci_set_confdir(ctx, dir); ULOG_INFO("attempting to load %s/%s\n", dir, file); if (uci_load(ctx, file, &pkg)) { uci_get_errorstr(ctx, &err, file); ULOG_ERR("unable to load configuration (%s)\n", err); free(err); return NULL; } return pkg; } static int config_load(char *cfg) { struct uci_context *ctx = uci_alloc_context(); struct uci_package *pkg = NULL; struct uci_element *e; char path[64]; vlist_init(&mounts, avl_strcmp, mounts_update); if (cfg) { snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg); pkg = config_try_load(ctx, path); if (!pkg) { snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg); pkg = config_try_load(ctx, path); } } if (!pkg) { snprintf(path, sizeof(path), "/etc/config/fstab"); pkg = config_try_load(ctx, path); } if (!pkg) { ULOG_ERR("no usable configuration\n"); return -1; } vlist_update(&mounts); uci_foreach_element(&pkg->sections, e) { struct uci_section *s = uci_to_section(e); if (!strcmp(s->type, "mount")) mount_add(s); if (!strcmp(s->type, "swap")) swap_add(s); if (!strcmp(s->type, "global")) global_add(s); } vlist_flush(&mounts); return 0; } static bool mtdblock_is_nand(char *mtdnum) { char tmppath[64]; char buf[16]; FILE *fp; snprintf(tmppath, sizeof(tmppath) - 1, "/sys/class/mtd/mtd%s/type", mtdnum); fp = fopen(tmppath, "r"); if (!fp) return false; if (!fgets(buf, sizeof(buf), fp)) { fclose(fp); return false; } fclose(fp); buf[sizeof(buf) - 1] = '\0'; /* make sure buf is 0-terminated */ buf[strlen(buf) - 1] = '\0'; /* strip final char (newline) */ if (strcmp(buf, "nand")) return false; /* * --- CUT HERE --- * Keep probing rootfs and rootfs_data in the meantime to not break * devices using JFFS2 on NAND but only trigger the kernel warnings. * Remove this once all devices using JFFS2 and squashfs directly on * NAND have been converted to UBI. */ snprintf(tmppath, sizeof(tmppath) - 1, "/sys/class/mtd/mtd%s/name", mtdnum); fp = fopen(tmppath, "r"); if (!fp) return false; if (!fgets(buf, sizeof(buf), fp)) { fclose(fp); return false; } fclose(fp); buf[sizeof(buf) - 1] = '\0'; /* make sure buf is 0-terminated */ buf[strlen(buf) - 1] = '\0'; /* strip final char (newline) */ /* only return true if name differs from 'rootfs' and 'rootfs_data' */ if (strcmp(buf, "rootfs") && strcmp(buf, "rootfs_data")) return true; /* --- CUT HERE --- */ return false; } static struct probe_info* _probe_path(char *path) { struct probe_info *pr, *epr; char tmppath[64]; if (!strncmp(path, "/dev/mtdblock", 13) && mtdblock_is_nand(path + 13)) return NULL; pr = probe_path(path); if (!pr) return NULL; if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' && path[8] >= '0' && path[8] <= '9' ) { /* skip ubi device if not UBIFS (as it requires ubiblock) */ if (strcmp("ubifs", pr->type)) return NULL; /* skip ubi device if ubiblock device is present */ snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8); list_for_each_entry(epr, &devices, list) if (!strcmp(epr->dev, tmppath)) return NULL; } return pr; } static int _cache_load(const char *path) { int gl_flags = GLOB_NOESCAPE | GLOB_MARK; int j; glob_t gl; if (glob(path, gl_flags, NULL, &gl) < 0) return -1; for (j = 0; j < gl.gl_pathc; j++) { struct probe_info *pr = _probe_path(gl.gl_pathv[j]); if (pr) list_add_tail(&pr->list, &devices); } globfree(&gl); return 0; } static void cache_load(int mtd) { if (mtd) { _cache_load("/dev/mtdblock*"); _cache_load("/dev/ubiblock*"); _cache_load("/dev/ubi[0-9]*"); } _cache_load("/dev/loop*"); _cache_load("/dev/mmcblk*"); _cache_load("/dev/sd*"); _cache_load("/dev/hd*"); _cache_load("/dev/md*"); _cache_load("/dev/nvme*"); _cache_load("/dev/vd*"); _cache_load("/dev/xvd*"); _cache_load("/dev/dm-*"); } static struct probe_info* find_block_info(char *uuid, char *label, char *path) { struct probe_info *pr = NULL; if (uuid) list_for_each_entry(pr, &devices, list) if (pr->uuid && !strcasecmp(pr->uuid, uuid)) return pr; if (label) list_for_each_entry(pr, &devices, list) if (pr->label && !strcmp(pr->label, label)) return pr; if (path) list_for_each_entry(pr, &devices, list) if (pr->dev && !strcmp(basename(pr->dev), basename(path))) return pr; return NULL; } static char* find_mount_point(char *block) { FILE *fp = fopen("/proc/self/mountinfo", "r"); static char line[256]; char *point = NULL, *pos, *tmp, *cpoint, *devname; struct stat s; int rstat; unsigned int minor, major; if (!fp) return NULL; rstat = stat(block, &s); while (fgets(line, sizeof(line), fp)) { pos = strchr(line, ' '); if (!pos) continue; pos = strchr(pos + 1, ' '); if (!pos) continue; tmp = ++pos; pos = strchr(pos, ':'); if (!pos) continue; *pos = '\0'; major = atoi(tmp); tmp = ++pos; pos = strchr(pos, ' '); if (!pos) continue; *pos = '\0'; minor = atoi(tmp); pos = strchr(pos + 1, ' '); if (!pos) continue; tmp = ++pos; pos = strchr(pos, ' '); if (!pos) continue; *pos = '\0'; cpoint = tmp; pos = strchr(pos + 1, ' '); if (!pos) continue; pos = strchr(pos + 1, ' '); if (!pos) continue; pos = strchr(pos + 1, ' '); if (!pos) continue; tmp = ++pos; pos = strchr(pos, ' '); if (!pos) continue; *pos = '\0'; devname = tmp; if (!strcmp(block, devname)) { point = strdup(cpoint); break; } if (rstat) continue; if (!S_ISBLK(s.st_mode)) continue; if (major == major(s.st_rdev) && minor == minor(s.st_rdev)) { point = strdup(cpoint); break; } } fclose(fp); return point; } static int print_block_uci(struct probe_info *pr) { if (!strcmp(pr->type, "swap")) { printf("config 'swap'\n"); } else { char *mp = find_mount_point(pr->dev); printf("config 'mount'\n"); if (mp) { printf("\toption\ttarget\t'%s'\n", mp); free(mp); } else { printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev)); } } if (pr->uuid) printf("\toption\tuuid\t'%s'\n", pr->uuid); else printf("\toption\tdevice\t'%s'\n", pr->dev); printf("\toption\tenabled\t'0'\n\n"); return 0; } static int print_block_info(struct probe_info *pr) { static char *mp; mp = find_mount_point(pr->dev); printf("%s:", pr->dev); if (pr->uuid) printf(" UUID=\"%s\"", pr->uuid); if (pr->label) printf(" LABEL=\"%s\"", pr->label); if (pr->version) printf(" VERSION=\"%s\"", pr->version); if (mp) { printf(" MOUNT=\"%s\"", mp); free(mp); } printf(" TYPE=\"%s\"\n", pr->type); return 0; } static void check_filesystem(struct probe_info *pr) { pid_t pid; struct stat statbuf; const char *e2fsck = "/usr/sbin/e2fsck"; const char *f2fsck = "/usr/sbin/fsck.f2fs"; const char *fatfsck = "/usr/sbin/fsck.fat"; const char *btrfsck = "/usr/bin/btrfsck"; const char *ntfsck = "/usr/bin/ntfsfix"; const char *ckfs; /* UBIFS does not need stuff like fsck */ if (!strncmp(pr->type, "ubifs", 5)) return; if (!strncmp(pr->type, "vfat", 4)) { ckfs = fatfsck; } else if (!strncmp(pr->type, "f2fs", 4)) { ckfs = f2fsck; } else if (!strncmp(pr->type, "ext", 3)) { ckfs = e2fsck; } else if (!strncmp(pr->type, "btrfs", 5)) { ckfs = btrfsck; } else if (!strncmp(pr->type, "ntfs", 4)) { ckfs = ntfsck; } else { ULOG_ERR("check_filesystem: %s is not supported\n", pr->type); return; } if (stat(ckfs, &statbuf) < 0) { ULOG_ERR("check_filesystem: %s not found\n", ckfs); return; } pid = fork(); if (!pid) { if(!strncmp(pr->type, "f2fs", 4)) { execl(ckfs, ckfs, "-f", pr->dev, NULL); exit(EXIT_FAILURE); } else if(!strncmp(pr->type, "btrfs", 5)) { execl(ckfs, ckfs, "--repair", pr->dev, NULL); exit(EXIT_FAILURE); } else if(!strncmp(pr->type, "ntfs", 4)) { execl(ckfs, ckfs, "-b", pr->dev, NULL); exit(EXIT_FAILURE); } else { execl(ckfs, ckfs, "-p", pr->dev, NULL); exit(EXIT_FAILURE); } } else if (pid > 0) { int status; waitpid(pid, &status, 0); if (WIFEXITED(status) && WEXITSTATUS(status)) ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status)); if (WIFSIGNALED(status)) ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status))); } } static void handle_swapfiles(bool on) { struct stat s; struct mount *m; struct probe_info *pr; vlist_for_each_element(&mounts, m, node) { if (m->type != TYPE_SWAP || !m->target) continue; if (stat(m->target, &s) || !S_ISREG(s.st_mode)) continue; pr = _probe_path(m->target); if (!pr) continue; if (!strcmp(pr->type, "swap")) { if (on) swapon(pr->dev, m->prio); else swapoff(pr->dev); } free(pr); } } static void to_devnull(int fd) { int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY); if (devnull >= 0) dup2(devnull, fd); if (devnull > STDERR_FILENO) close(devnull); } static int exec_mount(const char *source, const char *target, const char *fstype, const char *options) { pid_t pid; struct stat s; FILE *mount_fd; int err, status, pfds[2]; char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")]; snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype); if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) { ULOG_ERR("No \"mount.%s\" utility available\n", fstype); return -1; } if (pipe(pfds) < 0) return -1; fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC); fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC); pid = vfork(); switch (pid) { case -1: close(pfds[0]); close(pfds[1]); return -1; case 0: to_devnull(STDIN_FILENO); to_devnull(STDOUT_FILENO); dup2(pfds[1], STDERR_FILENO); close(pfds[0]); close(pfds[1]); if (options && *options) execl(cmd, cmd, "-o", options, source, target, NULL); else execl(cmd, cmd, source, target, NULL); return -1; default: close(pfds[1]); mount_fd = fdopen(pfds[0], "r"); while (fgets(errmsg, sizeof(errmsg), mount_fd)) ULOG_ERR("mount.%s: %s", fstype, errmsg); fclose(mount_fd); err = waitpid(pid, &status, 0); if (err != -1) { if (status != 0) { ULOG_ERR("mount.%s: failed with status %d\n", fstype, status); errno = EINVAL; err = -1; } else { errno = 0; err = 0; } } break; } return err; } static int handle_mount(const char *source, const char *target, const char *fstype, struct mount *m) { int i, err; size_t mount_opts_len; char *mount_opts = NULL, *ptr; err = mount(source, target, fstype, m ? m->flags : 0, (m && m->options) ? m->options : ""); /* Requested file system type is not available in kernel, attempt to call mount helper. */ if (err == -1 && errno == ENODEV) { if (m) { /* Convert mount flags back into string representation, first calculate needed length of string buffer... */ mount_opts_len = 1 + (m->options ? strlen(m->options) : 0); for (i = 0; i < ARRAY_SIZE(mount_flags); i++) if ((mount_flags[i].flag > 0) && (mount_flags[i].flag < INT_MAX) && (m->flags & (uint32_t)mount_flags[i].flag)) mount_opts_len += strlen(mount_flags[i].name) + 1; /* ... then now allocate and fill it ... */ ptr = mount_opts = calloc(1, mount_opts_len); if (!ptr) { errno = ENOMEM; return -1; } if (m->options) ptr += sprintf(ptr, "%s,", m->options); for (i = 0; i < ARRAY_SIZE(mount_flags); i++) if ((mount_flags[i].flag > 0) && (mount_flags[i].flag < INT_MAX) && (m->flags & (uint32_t)mount_flags[i].flag)) ptr += sprintf(ptr, "%s,", mount_flags[i].name); mount_opts[mount_opts_len - 1] = 0; } /* ... and now finally invoke the external mount program */ err = exec_mount(source, target, fstype, mount_opts); } free(mount_opts); return err; } static int blockd_notify(const char *method, char *device, struct mount *m, struct probe_info *pr) { struct ubus_context *ctx = ubus_connect(NULL); uint32_t id; int err; if (!ctx) return -ENXIO; if (!ubus_lookup_id(ctx, "block", &id)) { struct blob_buf buf = { 0 }; char *d = strrchr(device, '/'); if (d) d++; else d = device; blob_buf_init(&buf, 0); if (m) { blobmsg_add_string(&buf, "device", d); if (m->uuid) blobmsg_add_string(&buf, "uuid", m->uuid); if (m->label) blobmsg_add_string(&buf, "label", m->label); if (m->target) blobmsg_add_string(&buf, "target", m->target); if (m->options) blobmsg_add_string(&buf, "options", m->options); if (m->autofs) blobmsg_add_u32(&buf, "autofs", m->autofs); if (pr->type) blobmsg_add_string(&buf, "type", pr->type); if (pr->version) blobmsg_add_string(&buf, "version", pr->version); } else if (pr) { blobmsg_add_string(&buf, "device", d); if (pr->uuid) blobmsg_add_string(&buf, "uuid", pr->uuid); if (pr->label) blobmsg_add_string(&buf, "label", pr->label); if (pr->type) blobmsg_add_string(&buf, "type", pr->type); if (pr->version) blobmsg_add_string(&buf, "version", pr->version); blobmsg_add_u32(&buf, "anon", 1); } else { blobmsg_add_string(&buf, "device", d); blobmsg_add_u32(&buf, "remove", 1); } err = ubus_invoke(ctx, id, method, buf.head, NULL, NULL, 3000); } else { err = -ENOENT; } ubus_free(ctx); return err; } static int mount_device(struct probe_info *pr, int type) { struct mount *m; struct stat st; char *_target = NULL; char *target; char *device; char *mp; int err; if (!pr) return -1; device = basename(pr->dev); if (!strcmp(pr->type, "swap")) { if ((type == TYPE_HOTPLUG) && !auto_swap) return -1; m = find_swap(pr->uuid, pr->label, device); if (m || anon_swap) swapon(pr->dev, (m) ? (m->prio) : (0)); return 0; } m = find_block(pr->uuid, pr->label, device, NULL); if (m && m->extroot) return -1; mp = find_mount_point(pr->dev); if (mp) { if (m && m->type == TYPE_MOUNT && m->target && strcmp(m->target, mp)) { ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp); err = -1; } else err = 0; free(mp); return err; } if (type == TYPE_HOTPLUG) blockd_notify("hotplug", device, m, pr); /* Check if device should be mounted & set the target directory */ if (m) { switch (type) { case TYPE_HOTPLUG: if (m->autofs) return 0; if (!auto_mount) return -1; break; case TYPE_AUTOFS: if (!m->autofs) return -1; break; case TYPE_DEV: if (m->autofs) return -1; break; } if (m->autofs) { if (asprintf(&_target, "/tmp/run/blockd/%s", device) == -1) exit(ENOMEM); target = _target; } else if (m->target) { target = m->target; } else { if (asprintf(&_target, "/mnt/%s", device) == -1) exit(ENOMEM); target = _target; } } else if (anon_mount) { if (asprintf(&_target, "/mnt/%s", device) == -1) exit(ENOMEM); target = _target; } else { /* No reason to mount this device */ return 0; } /* Mount the device */ if (check_fs) check_filesystem(pr); mkdir_p(target, 0755); if (!lstat(target, &st) && S_ISLNK(st.st_mode)) unlink(target); err = handle_mount(pr->dev, target, pr->type, m); if (err) { ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n", pr->dev, pr->type, target, errno); if (_target) free(_target); return err; } if (_target) free(_target); handle_swapfiles(true); if (type != TYPE_AUTOFS) blockd_notify("mount", device, NULL, NULL); return 0; } static int umount_device(char *path, int type, bool all) { char *mp, *devpath; int err; if (strlen(path) > 5 && !strncmp("/dev/", path, 5)) { mp = find_mount_point(path); } else { devpath = malloc(strlen(path) + 6); strcpy(devpath, "/dev/"); strcat(devpath, path); mp = find_mount_point(devpath); free(devpath); } if (!mp) return -1; if (!strcmp(mp, "/") && !all) { free(mp); return 0; } if (type != TYPE_AUTOFS) blockd_notify("umount", basename(path), NULL, NULL); err = umount2(mp, MNT_DETACH); if (err) { ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp, errno); } else { ULOG_INFO("unmounted %s (%s)\n", path, mp); rmdir(mp); } free(mp); return err; } static int mount_action(char *action, char *device, int type) { char *path = NULL; struct probe_info *pr; if (!action || !device) return -1; if (!strcmp(action, "remove")) { if (type == TYPE_HOTPLUG) blockd_notify("hotplug", device, NULL, NULL); umount_device(device, type, true); return 0; } else if (strcmp(action, "add")) { ULOG_ERR("Unkown action %s\n", action); return -1; } if (config_load(NULL)) return -1; cache_load(1); list_for_each_entry(pr, &devices, list) if (!strcmp(basename(pr->dev), device)) path = pr->dev; if (!path) return -1; return mount_device(find_block_info(NULL, NULL, path), type); } static int main_hotplug(int argc, char **argv) { return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG); } static int main_autofs(int argc, char **argv) { int err = 0; if (argc < 3) return -1; if (!strcmp(argv[2], "start")) { struct probe_info *pr; if (config_load(NULL)) return -1; cache_load(1); list_for_each_entry(pr, &devices, list) { struct mount *m; char *mp; if (!strcmp(pr->type, "swap")) continue; m = find_block(pr->uuid, pr->label, NULL, NULL); if (m && m->extroot) continue; blockd_notify("hotplug", pr->dev, m, pr); if ((!m || !m->autofs) && (mp = find_mount_point(pr->dev))) { blockd_notify("mount", pr->dev, NULL, NULL); free(mp); } } } else { if (argc < 4) return -EINVAL; err = mount_action(argv[2], argv[3], TYPE_AUTOFS); } if (err) { ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err); } return err; } static int find_block_mtd(char *name, char *part, int plen) { FILE *fp = fopen("/proc/mtd", "r"); static char line[256]; char *index = NULL; if(!fp) return -1; while (!index && fgets(line, sizeof(line), fp)) { if (strstr(line, name)) { char *eol = strstr(line, ":"); if (!eol) continue; *eol = '\0'; index = &line[3]; } } fclose(fp); if (!index) return -1; snprintf(part, plen, "/dev/mtdblock%s", index); return 0; } #ifdef UBIFS_EXTROOT static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id) { int dev = 0; while (ubi_dev_present(libubi, dev)) { struct ubi_dev_info dev_info; struct ubi_vol_info vol_info; if (ubi_get_dev_info1(libubi, dev++, &dev_info)) continue; if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info)) continue; *dev_num = dev_info.dev_num; *vol_id = vol_info.vol_id; return 0; } return -1; } static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen) { int dev_num; int vol_id; int err = -1; err = find_ubi_vol(libubi, name, &dev_num, &vol_id); if (!err) snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id); return err; } static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen) { int dev_num; int vol_id; int err = -1; err = find_ubi_vol(libubi, name, &dev_num, &vol_id); if (!err) snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id); return err; } #endif static int find_root_dev(char *buf, int len) { DIR *d; dev_t root; struct stat s; struct dirent *e; if (stat("/", &s)) return -1; if (!(d = opendir("/dev"))) return -1; root = s.st_dev; while ((e = readdir(d)) != NULL) { snprintf(buf, len, "/dev/%s", e->d_name); if (stat(buf, &s) || s.st_rdev != root) continue; closedir(d); return 0; } closedir(d); return -1; } static int test_fs_support(const char *name) { char line[128], *p; int rv = -1; FILE *f; if ((f = fopen("/proc/filesystems", "r")) != NULL) { while (fgets(line, sizeof(line), f)) { p = strtok(line, "\t\n"); if (p && !strcmp(p, "nodev")) p = strtok(NULL, "\t\n"); if (p && !strcmp(p, name)) { rv = 0; break; } } fclose(f); } return rv; } /** * Check if mounted partition is a valid extroot * * @path target mount point * * Valid extroot partition has to contain /etc/.extroot-uuid with UUID of root * device. This function reads UUID and verifies it OR writes UUID to * .extroot-uuid if it doesn't exist yet (first extroot usage). */ static int check_extroot(char *path) { struct probe_info *pr = NULL; struct probe_info *tmp; struct stat s; char uuid[64] = { 0 }; char devpath[32]; char tag[64]; FILE *fp; int err; err = find_block_mtd("\"rootfs\"", devpath, sizeof(devpath)); #ifdef UBIFS_EXTROOT if (err) { libubi_t libubi; libubi = libubi_open(); err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath)); libubi_close(libubi); } #endif if (err) { err = find_root_dev(devpath, sizeof(devpath)); } if (err) { ULOG_ERR("extroot: unable to determine root device\n"); return -1; } /* Find root device probe_info so we know its UUID */ list_for_each_entry(tmp, &devices, list) { if (!strcmp(tmp->dev, devpath)) { pr = tmp; break; } } if (!pr) { ULOG_ERR("extroot: unable to lookup root device %s\n", devpath); return -1; } snprintf(tag, sizeof(tag), "%s/etc", path); if (stat(tag, &s)) mkdir_p(tag, 0755); snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path); if (stat(tag, &s)) { fp = fopen(tag, "w+"); if (!fp) { ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n", tag, errno); /* return 0 to continue boot regardless of error */ return 0; } fputs(pr->uuid, fp); fclose(fp); return 0; } fp = fopen(tag, "r"); if (!fp) { ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag, errno); return -1; } if (!fgets(uuid, sizeof(uuid), fp)) ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag, errno); fclose(fp); if (*uuid && !strcasecmp(uuid, pr->uuid)) return 0; ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n", pr->uuid, basename(path), uuid); return -1; } /* * Read info about extroot from UCI (using prefix) and mount it. */ static int mount_extroot(char *cfg) { char overlay[] = "/tmp/extroot/overlay"; char mnt[] = "/tmp/extroot/mnt"; char *path = mnt; struct probe_info *pr; struct mount *m; int err = -1; /* Load @cfg/etc/config/fstab */ if (config_load(cfg)) return -2; /* See if there is extroot-specific mount config */ m = find_block(NULL, NULL, NULL, "/"); if (!m) m = find_block(NULL, NULL, NULL, "/overlay"); if (!m || !m->extroot) { ULOG_INFO("extroot: not configured\n"); return -1; } /* Find block device pointed by the mount config */ pr = find_block_info(m->uuid, m->label, m->device); if (!pr && delay_root){ ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root); sleep(delay_root); make_devs(); cache_load(1); pr = find_block_info(m->uuid, m->label, m->device); } if (pr) { if (strncmp(pr->type, "ext", 3) && strncmp(pr->type, "f2fs", 4) && strncmp(pr->type, "btrfs", 5) && strncmp(pr->type, "ntfs", 4) && strncmp(pr->type, "ubifs", 5)) { ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type); return -1; } if (test_fs_support(pr->type)) { ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type); return -1; } if (m->overlay) path = overlay; mkdir_p(path, 0755); if (check_fs) check_filesystem(pr); err = mount(pr->dev, path, pr->type, m->flags, (m->options) ? (m->options) : ("")); if (err) { ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n", pr->dev, pr->type, path, errno); } else if (m->overlay) { err = check_extroot(path); if (err) umount(path); } } else { ULOG_ERR("extroot: cannot find device %s%s\n", (m->uuid ? "with UUID " : (m->label ? "with label " : "")), (m->uuid ? m->uuid : (m->label ? m->label : m->device))); } return err; } /** * Look for extroot config and mount it if present * * Look for /etc/config/fstab on all supported partitions and use it for * mounting extroot if specified. */ static int main_extroot(int argc, char **argv) { struct probe_info *pr; char blkdev_path[32] = { 0 }; int err = -1; #ifdef UBIFS_EXTROOT libubi_t libubi; #endif if (!getenv("PREINIT")) return -1; if (argc != 2) { ULOG_ERR("Usage: block extroot\n"); return -1; } make_devs(); cache_load(1); /* enable LOG_INFO messages */ ulog_threshold(LOG_INFO); /* * Look for "rootfs_data". We will want to mount it and check for * extroot configuration. */ /* Start with looking for MTD partition */ find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path)); if (blkdev_path[0]) { pr = find_block_info(NULL, NULL, blkdev_path); if (pr && !strcmp(pr->type, "jffs2")) { char cfg[] = "/tmp/jffs_cfg"; /* * Mount MTD part and try extroot (using * /etc/config/fstab from that partition) */ mkdir_p(cfg, 0755); if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) { err = mount_extroot(cfg); umount2(cfg, MNT_DETACH); } if (err < 0) rmdir("/tmp/overlay"); rmdir(cfg); return err; } } #ifdef UBIFS_EXTROOT /* ... but it also could be an UBI volume */ memset(blkdev_path, 0, sizeof(blkdev_path)); libubi = libubi_open(); find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path)); libubi_close(libubi); if (blkdev_path[0]) { char cfg[] = "/tmp/ubifs_cfg"; /* Mount volume and try extroot (using fstab from that vol) */ mkdir_p(cfg, 0755); if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) { err = mount_extroot(cfg); umount2(cfg, MNT_DETACH); } if (err < 0) rmdir("/tmp/overlay"); rmdir(cfg); return err; } #endif /* As a last resort look for /etc/config/fstab on "rootfs" partition */ return mount_extroot(NULL); } static int main_mount(int argc, char **argv) { struct probe_info *pr; if (config_load(NULL)) return -1; cache_load(1); list_for_each_entry(pr, &devices, list) mount_device(pr, TYPE_DEV); handle_swapfiles(true); return 0; } static int main_umount(int argc, char **argv) { struct probe_info *pr; bool all = false; if (config_load(NULL)) return -1; handle_swapfiles(false); cache_load(1); if (argc == 3) all = !strcmp(argv[2], "-a"); list_for_each_entry(pr, &devices, list) { struct mount *m; if (!strcmp(pr->type, "swap")) continue; m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL); if (m && m->extroot) continue; umount_device(pr->dev, TYPE_DEV, all); } return 0; } static int main_detect(int argc, char **argv) { struct probe_info *pr; cache_load(0); printf("config 'global'\n"); printf("\toption\tanon_swap\t'0'\n"); printf("\toption\tanon_mount\t'0'\n"); printf("\toption\tauto_swap\t'1'\n"); printf("\toption\tauto_mount\t'1'\n"); printf("\toption\tdelay_root\t'5'\n"); printf("\toption\tcheck_fs\t'0'\n\n"); list_for_each_entry(pr, &devices, list) print_block_uci(pr); return 0; } static int main_info(int argc, char **argv) { int i; struct probe_info *pr; cache_load(1); if (argc == 2) { list_for_each_entry(pr, &devices, list) print_block_info(pr); return 0; }; for (i = 2; i < argc; i++) { struct stat s; if (stat(argv[i], &s)) { ULOG_ERR("failed to stat %s\n", argv[i]); continue; } if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) { ULOG_ERR("%s is not a block device\n", argv[i]); continue; } pr = find_block_info(NULL, NULL, argv[i]); if (pr) print_block_info(pr); } return 0; } static int swapon_usage(void) { fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n" "\tStart swapping on [DEVICE]\n" " -a\tStart swapping on all swap devices\n" " -p pri\tSet priority of swap device\n" " -s\tShow summary\n"); return -1; } static int main_swapon(int argc, char **argv) { int ch; FILE *fp; char *lineptr; size_t s; struct probe_info *pr; int flags = 0; int pri; struct stat st; int err; while ((ch = getopt(argc, argv, "ap:s")) != -1) { switch(ch) { case 's': fp = fopen("/proc/swaps", "r"); lineptr = NULL; if (!fp) { ULOG_ERR("failed to open /proc/swaps\n"); return -1; } while (getline(&lineptr, &s, fp) > 0) printf("%s", lineptr); if (lineptr) free(lineptr); fclose(fp); return 0; case 'a': cache_load(0); list_for_each_entry(pr, &devices, list) { if (strcmp(pr->type, "swap")) continue; if (swapon(pr->dev, 0)) ULOG_ERR("failed to swapon %s\n", pr->dev); } return 0; case 'p': pri = atoi(optarg); if (pri >= 0) flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER; break; default: return swapon_usage(); } } if (optind != (argc - 1)) return swapon_usage(); if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) { ULOG_ERR("%s is not a block device or file\n", argv[optind]); return -1; } err = swapon(argv[optind], flags); if (err) { ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err); return err; } return 0; } static int main_swapoff(int argc, char **argv) { if (argc != 2) { ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n" "\tStop swapping on DEVICE\n" " -a\tStop swapping on all swap devices\n"); return -1; } if (!strcmp(argv[1], "-a")) { FILE *fp = fopen("/proc/swaps", "r"); char line[256]; if (!fp) { ULOG_ERR("failed to open /proc/swaps\n"); return -1; } if (fgets(line, sizeof(line), fp)) while (fgets(line, sizeof(line), fp)) { char *end = strchr(line, ' '); int err; if (!end) continue; *end = '\0'; err = swapoff(line); if (err) ULOG_ERR("failed to swapoff %s (%d)\n", line, err); } fclose(fp); } else { struct stat s; int err; if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) { ULOG_ERR("%s is not a block device or file\n", argv[1]); return -1; } err = swapoff(argv[1]); if (err) { ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err); return err; } } return 0; } int main(int argc, char **argv) { char *base = basename(*argv); umask(0); ulog_open(-1, -1, "block"); ulog_threshold(LOG_NOTICE); if (!strcmp(base, "swapon")) return main_swapon(argc, argv); if (!strcmp(base, "swapoff")) return main_swapoff(argc, argv); if ((argc > 1) && !strcmp(base, "block")) { if (!strcmp(argv[1], "info")) return main_info(argc, argv); if (!strcmp(argv[1], "detect")) return main_detect(argc, argv); if (!strcmp(argv[1], "hotplug")) return main_hotplug(argc, argv); if (!strcmp(argv[1], "autofs")) return main_autofs(argc, argv); if (!strcmp(argv[1], "extroot")) return main_extroot(argc, argv); if (!strcmp(argv[1], "mount")) return main_mount(argc, argv); if (!strcmp(argv[1], "umount")) return main_umount(argc, argv); if (!strcmp(argv[1], "remount")) { int ret = main_umount(argc, argv); if (!ret) ret = main_mount(argc, argv); return ret; } } ULOG_ERR("Usage: block \n"); return -1; }