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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <linux/btrfs.h>
#include <linux/magic.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/vfs.h>
#include "sd-device.h"
#include "blockdev-util.h"
#include "btrfs-util.h"
#include "build.h"
#include "cryptsetup-util.h"
#include "device-nodes.h"
#include "device-util.h"
#include "devnum-util.h"
#include "dissect-image.h"
#include "escape.h"
#include "fd-util.h"
#include "format-util.h"
#include "log.h"
#include "main-func.h"
#include "mountpoint-util.h"
#include "parse-util.h"
#include "pretty-print.h"
#include "resize-fs.h"
static const char *arg_target = NULL;
static bool arg_dry_run = false;
#if HAVE_LIBCRYPTSETUP
static int resize_crypt_luks_device(dev_t devno, const char *fstype, dev_t main_devno) {
_cleanup_free_ char *devpath = NULL, *main_devpath = NULL;
_cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
_cleanup_close_ int main_devfd = -EBADF;
uint64_t size;
int r;
r = dlopen_cryptsetup();
if (r < 0)
return log_error_errno(r, "Cannot resize LUKS device: %m");
main_devfd = r = device_open_from_devnum(S_IFBLK, main_devno, O_RDONLY|O_CLOEXEC, &main_devpath);
if (r < 0)
return log_error_errno(r, "Failed to open main block device " DEVNUM_FORMAT_STR ": %m",
DEVNUM_FORMAT_VAL(main_devno));
if (ioctl(main_devfd, BLKGETSIZE64, &size) != 0)
return log_error_errno(errno, "Failed to query size of \"%s\" (before resize): %m",
main_devpath);
log_debug("%s is %"PRIu64" bytes", main_devpath, size);
r = devname_from_devnum(S_IFBLK, devno, &devpath);
if (r < 0)
return log_error_errno(r, "Failed to get devpath of " DEVNUM_FORMAT_STR ": %m",
DEVNUM_FORMAT_VAL(devno));
r = sym_crypt_init(&cd, devpath);
if (r < 0)
return log_error_errno(r, "crypt_init(\"%s\") failed: %m", devpath);
cryptsetup_enable_logging(cd);
r = sym_crypt_load(cd, CRYPT_LUKS, NULL);
if (r < 0)
return log_debug_errno(r, "Failed to load LUKS metadata for %s: %m", devpath);
if (arg_dry_run)
return 0;
r = sym_crypt_resize(cd, main_devpath, 0);
if (r < 0)
return log_error_errno(r, "crypt_resize() of %s failed: %m", devpath);
if (ioctl(main_devfd, BLKGETSIZE64, &size) != 0)
log_warning_errno(errno, "Failed to query size of \"%s\" (after resize): %m",
devpath);
else
log_debug("%s is now %"PRIu64" bytes", main_devpath, size);
return 1;
}
#endif
static int maybe_resize_underlying_device(
int mountfd,
const char *mountpath,
dev_t main_devno) {
_cleanup_free_ char *devpath = NULL, *fstype = NULL;
dev_t devno;
int r;
assert(mountfd >= 0);
assert(mountpath);
#if HAVE_LIBCRYPTSETUP
cryptsetup_enable_logging(NULL);
#endif
r = get_block_device_harder_fd(mountfd, &devno);
if (r < 0)
return log_error_errno(r, "Failed to determine underlying block device of \"%s\": %m",
mountpath);
if (devno == 0)
return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "File system \"%s\" not backed by block device.", arg_target);
log_debug("Underlying device " DEVNUM_FORMAT_STR ", main dev " DEVNUM_FORMAT_STR ", %s",
DEVNUM_FORMAT_VAL(devno),
DEVNUM_FORMAT_VAL(main_devno),
devno == main_devno ? "same" : "different");
if (devno == main_devno)
return 0;
r = devname_from_devnum(S_IFBLK, devno, &devpath);
if (r < 0)
return log_error_errno(r, "Failed to get devpath for block device " DEVNUM_FORMAT_STR ": %m",
DEVNUM_FORMAT_VAL(devno));
r = probe_filesystem(devpath, &fstype);
if (r == -EUCLEAN)
return log_warning_errno(r, "Cannot reliably determine probe \"%s\", refusing to proceed.", devpath);
if (r < 0)
return log_warning_errno(r, "Failed to probe \"%s\": %m", devpath);
#if HAVE_LIBCRYPTSETUP
if (streq_ptr(fstype, "crypto_LUKS"))
return resize_crypt_luks_device(devno, fstype, main_devno);
#endif
log_debug("Don't know how to resize %s of type %s, ignoring.", devpath, strnull(fstype));
return 0;
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-growfs@.service", "8", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...] /path/to/mountpoint\n\n"
"Grow filesystem or encrypted payload to device size.\n\n"
"Options:\n"
" -h --help Show this help and exit\n"
" --version Print version string and exit\n"
" -n --dry-run Just print what would be done\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
link);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
};
int c;
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version" , no_argument, NULL, ARG_VERSION },
{ "dry-run", no_argument, NULL, 'n' },
{}
};
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hn", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case 'n':
arg_dry_run = true;
break;
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (optind + 1 != argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"%s excepts exactly one argument (the mount point).",
program_invocation_short_name);
arg_target = argv[optind];
return 1;
}
static int run(int argc, char *argv[]) {
_cleanup_close_ int mountfd = -EBADF, devfd = -EBADF;
_cleanup_free_ char *devpath = NULL;
uint64_t size, newsize;
dev_t devno;
int r;
log_setup();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
r = path_is_mount_point(arg_target, NULL, 0);
if (r < 0)
return log_error_errno(r, "Failed to check if \"%s\" is a mount point: %m", arg_target);
if (r == 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "\"%s\" is not a mount point: %m", arg_target);
mountfd = open(arg_target, O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (mountfd < 0)
return log_error_errno(errno, "Failed to open \"%s\": %m", arg_target);
r = get_block_device_fd(mountfd, &devno);
if (r == -EUCLEAN)
return btrfs_log_dev_root(LOG_ERR, r, arg_target);
if (r < 0)
return log_error_errno(r, "Failed to determine block device of \"%s\": %m", arg_target);
if (devno == 0)
return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "File system \"%s\" not backed by block device.", arg_target);
r = maybe_resize_underlying_device(mountfd, arg_target, devno);
if (r < 0)
log_warning_errno(r, "Unable to resize underlying device of \"%s\", proceeding anyway: %m", arg_target);
devfd = r = device_open_from_devnum(S_IFBLK, devno, O_RDONLY|O_CLOEXEC, &devpath);
if (r < 0)
return log_error_errno(r, "Failed to open block device " DEVNUM_FORMAT_STR ": %m",
DEVNUM_FORMAT_VAL(devno));
if (ioctl(devfd, BLKGETSIZE64, &size) != 0)
return log_error_errno(errno, "Failed to query size of \"%s\": %m", devpath);
log_debug("Resizing \"%s\" to %"PRIu64" bytes...", arg_target, size);
if (arg_dry_run)
return 0;
r = resize_fs(mountfd, size, &newsize);
if (r < 0)
return log_error_errno(r, "Failed to resize \"%s\" to %"PRIu64" bytes: %m",
arg_target, size);
if (newsize == size)
log_info("Successfully resized \"%s\" to %s bytes.",
arg_target,
FORMAT_BYTES(newsize));
else
log_info("Successfully resized \"%s\" to %s bytes (%"PRIu64" bytes lost due to blocksize).",
arg_target,
FORMAT_BYTES(newsize),
size - newsize);
return 0;
}
DEFINE_MAIN_FUNCTION(run);
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