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block.c
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block.c
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/*
* Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
*
* 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.
*/
#define _GNU_SOURCE
#include <getopt.h>
#include <stdio.h>
#include <unistd.h>
#include <syslog.h>
#include <libgen.h>
#include <glob.h>
#include <dirent.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/swap.h>
#include <sys/mount.h>
#include <sys/wait.h>
#include <sys/sysmacros.h>
#include <uci.h>
#include <uci_blob.h>
#include <libubox/avl-cmp.h>
#include <libubox/blobmsg_json.h>
#include <libubox/list.h>
#include <libubox/ulog.h>
#include <libubox/utils.h>
#include <libubox/vlist.h>
#include <libubus.h>
#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 const char * const ntfs_fs[] = { "ntfs3", "ntfs-3g", "antfs", "ntfs" };
static int handle_mount(const char *source, const char *target,
const char *fstype, struct mount *m)
{
size_t mount_opts_len;
char *mount_opts = NULL, *ptr;
const char * const *filesystems;
int err = -EINVAL;
size_t count;
int i;
if (!strcmp(fstype, "ntfs")) {
filesystems = ntfs_fs;
count = ARRAY_SIZE(ntfs_fs);
} else {
filesystems = &fstype;
count = 1;
}
for (i = 0; i < count; i++) {
const char *fs = filesystems[i];
err = mount(source, target, fs, m ? m->flags : 0,
(m && m->options) ? m->options : "");
if (!err || errno != ENODEV)
break;
}
/* 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 */