/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <linux/magic.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/vfs.h>
#include "blockdev-util.h"
#include "crypt-util.h"
#include "device-nodes.h"
#include "dissect-image.h"
#include "escape.h"
#include "fd-util.h"
#include "format-util.h"
#include "log.h"
#include "missing.h"
#include "mount-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "strv.h"
const char *arg_target = NULL;
bool arg_dry_run = false;
static int resize_ext4(const char *path, int mountfd, int devfd, uint64_t numblocks, uint64_t blocksize) {
assert((uint64_t) (int) blocksize == blocksize);
if (arg_dry_run)
return 0;
if (ioctl(mountfd, EXT4_IOC_RESIZE_FS, &numblocks) != 0)
return log_error_errno(errno, "Failed to resize \"%s\" to %"PRIu64" blocks (ext4): %m",
path, numblocks);
return 0;
}
static int resize_btrfs(const char *path, int mountfd, int devfd, uint64_t numblocks, uint64_t blocksize) {
struct btrfs_ioctl_vol_args args = {};
int r;
assert((uint64_t) (int) blocksize == blocksize);
/* https://bugzilla.kernel.org/show_bug.cgi?id=118111 */
if (numblocks * blocksize < 256*1024*1024) {
log_warning("%s: resizing of btrfs volumes smaller than 256M is not supported", path);
return -EOPNOTSUPP;
}
r = snprintf(args.name, sizeof(args.name), "%"PRIu64, numblocks * blocksize);
/* The buffer is large enough for any number to fit... */
assert((size_t) r < sizeof(args.name));
if (arg_dry_run)
return 0;
if (ioctl(mountfd, BTRFS_IOC_RESIZE, &args) != 0)
return log_error_errno(errno, "Failed to resize \"%s\" to %"PRIu64" blocks (btrfs): %m",
path, numblocks);
return 0;
}
#if HAVE_LIBCRYPTSETUP
static int resize_crypt_luks_device(dev_t devno, const char *fstype, dev_t main_devno) {
char devpath[DEV_NUM_PATH_MAX], main_devpath[DEV_NUM_PATH_MAX];
_cleanup_close_ int main_devfd = -1;
_cleanup_(crypt_freep) struct crypt_device *cd = NULL;
uint64_t size;
int r;
xsprintf_dev_num_path(main_devpath, "block", main_devno);
main_devfd = open(main_devpath, O_RDONLY|O_CLOEXEC);
if (main_devfd < 0)
return log_error_errno(errno, "Failed to open \"%s\": %m", main_devpath);
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);
xsprintf_dev_num_path(devpath, "block", devno);
r = crypt_init(&cd, devpath);
if (r < 0)
return log_error_errno(r, "crypt_init(\"%s\") failed: %m", devpath);
crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
r = 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 = 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_slave_device(const char *mountpath, dev_t main_devno) {
dev_t devno;
char devpath[DEV_NUM_PATH_MAX];
_cleanup_free_ char *fstype = NULL;
int r;
#if HAVE_LIBCRYPTSETUP
crypt_set_log_callback(NULL, cryptsetup_log_glue, NULL);
crypt_set_debug_level(1);
#endif
r = get_block_device_harder(mountpath, &devno);
if (r < 0)
return log_error_errno(r, "Failed to determine underlying block device of \"%s\": %m",
mountpath);
log_debug("Underlying device %d:%d, main dev %d:%d, %s",
major(devno), minor(devno),
major(main_devno), minor(main_devno),
devno == main_devno ? "same" : "different");
if (devno == main_devno)
return 0;
xsprintf_dev_num_path(devpath, "block", 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 void help(void) {
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"
, program_invocation_short_name);
}
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':
help();
return 0;
case ARG_VERSION:
version();
return 0;
case 'n':
arg_dry_run = true;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
if (optind + 1 != argc) {
log_error("%s excepts exactly one argument (the mount point).",
program_invocation_short_name);
return -EINVAL;
}
arg_target = argv[optind];
return 1;
}
int main(int argc, char *argv[]) {
dev_t devno;
_cleanup_close_ int mountfd = -1, devfd = -1;
int blocksize;
uint64_t size, numblocks;
char devpath[DEV_NUM_PATH_MAX], fb[FORMAT_BYTES_MAX];
struct statfs sfs;
int r;
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r < 0)
return EXIT_FAILURE;
if (r == 0)
return EXIT_SUCCESS;
r = path_is_mount_point(arg_target, NULL, 0);
if (r < 0) {
log_error_errno(r, "Failed to check if \"%s\" is a mount point: %m", arg_target);
return EXIT_FAILURE;
}
if (r == 0) {
log_error_errno(r, "\"%s\" is not a mount point: %m", arg_target);
return EXIT_FAILURE;
}
r = get_block_device(arg_target, &devno);
if (r < 0) {
log_error_errno(r, "Failed to determine block device of \"%s\": %m", arg_target);
return EXIT_FAILURE;
}
r = maybe_resize_slave_device(arg_target, devno);
if (r < 0)
return EXIT_FAILURE;
mountfd = open(arg_target, O_RDONLY|O_CLOEXEC);
if (mountfd < 0) {
log_error_errno(errno, "Failed to open \"%s\": %m", arg_target);
return EXIT_FAILURE;
}
xsprintf_dev_num_path(devpath, "block", devno);
devfd = open(devpath, O_RDONLY|O_CLOEXEC);
if (devfd < 0) {
log_error_errno(errno, "Failed to open \"%s\": %m", devpath);
return EXIT_FAILURE;
}
if (ioctl(devfd, BLKBSZGET, &blocksize) != 0) {
log_error_errno(errno, "Failed to query block size of \"%s\": %m", devpath);
return EXIT_FAILURE;
}
if (ioctl(devfd, BLKGETSIZE64, &size) != 0) {
log_error_errno(errno, "Failed to query size of \"%s\": %m", devpath);
return EXIT_FAILURE;
}
if (size % blocksize != 0)
log_notice("Partition size %"PRIu64" is not a multiple of the blocksize %d,"
" ignoring %"PRIu64" bytes", size, blocksize, size % blocksize);
numblocks = size / blocksize;
if (fstatfs(mountfd, &sfs) < 0) {
log_error_errno(errno, "Failed to stat file system \"%s\": %m", arg_target);
return EXIT_FAILURE;
}
switch(sfs.f_type) {
case EXT4_SUPER_MAGIC:
r = resize_ext4(arg_target, mountfd, devfd, numblocks, blocksize);
break;
case BTRFS_SUPER_MAGIC:
r = resize_btrfs(arg_target, mountfd, devfd, numblocks, blocksize);
break;
default:
log_error("Don't know how to resize fs %llx on \"%s\"",
(long long unsigned) sfs.f_type, arg_target);
return EXIT_FAILURE;
}
if (r < 0)
return EXIT_FAILURE;
log_info("Successfully resized \"%s\" to %s bytes (%"PRIu64" blocks of %d bytes).",
arg_target, format_bytes(fb, sizeof fb, size), numblocks, blocksize);
return EXIT_SUCCESS;
}