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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of elogind.
Copyright 2017 Zbigniew Jędrzejewski-Szmek
elogind is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
elogind 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with elogind; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <fcntl.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 "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"
static int resize_ext4(int mountfd, int devfd, uint64_t numblocks, uint64_t blocksize) {
assert((uint64_t) (int) blocksize == blocksize);
if (ioctl(mountfd, EXT4_IOC_RESIZE_FS, &numblocks) != 0)
return -errno;
return 0;
}
static int resize_btrfs(int mountfd, int devfd, uint64_t numblocks, uint64_t blocksize) {
struct btrfs_ioctl_vol_args args = {};
int r;
assert((uint64_t) (int) blocksize == blocksize);
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 (ioctl(mountfd, BTRFS_IOC_RESIZE, &args) != 0)
return -errno;
return 0;
}
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);
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;
}
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;
crypt_set_log_callback(NULL, cryptsetup_log_glue, NULL);
crypt_set_debug_level(1);
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 < 0)
return log_warning_errno(r, "Failed to probe \"%s\": %m", devpath);
if (streq_ptr(fstype, "crypto_LUKS"))
return resize_crypt_luks_device(devno, fstype, main_devno);
log_debug("Don't know how to resize %s of type %s, ignoring", devpath, strnull(fstype));
return 0;
}
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;
if (argc != 2) {
log_error("This program requires one argument (the mountpoint).");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
r = path_is_mount_point(argv[1], NULL, 0);
if (r < 0) {
log_error_errno(r, "Failed to check if \"%s\" is a mount point: %m", argv[1]);
return EXIT_FAILURE;
}
if (r == 0) {
log_error_errno(r, "\"%s\" is not a mount point: %m", argv[1]);
return EXIT_FAILURE;
}
r = get_block_device(argv[1], &devno);
if (r < 0) {
log_error_errno(r, "Failed to determine block device of \"%s\": %m", argv[1]);
return EXIT_FAILURE;
}
r = maybe_resize_slave_device(argv[1], devno);
if (r < 0)
return EXIT_FAILURE;
mountfd = open(argv[1], O_RDONLY|O_CLOEXEC);
if (mountfd < 0) {
log_error_errno(errno, "Failed to open \"%s\": %m", argv[1]);
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", argv[1]);
return EXIT_FAILURE;
}
switch(sfs.f_type) {
case EXT4_SUPER_MAGIC:
r = resize_ext4(mountfd, devfd, numblocks, blocksize);
break;
case BTRFS_SUPER_MAGIC:
r = resize_btrfs(mountfd, devfd, numblocks, blocksize);
break;
default:
log_error("Don't know how to resize fs %llx on \"%s\"",
(long long unsigned) sfs.f_type, argv[1]);
return EXIT_FAILURE;
}
if (r < 0) {
log_error_errno(r, "Failed to resize \"%s\" to %"PRIu64" blocks: %m",
argv[1], numblocks);
return EXIT_FAILURE;
}
log_info("Successfully resized \"%s\" to %s bytes (%"PRIu64" blocks of %d bytes).",
argv[1], format_bytes(fb, sizeof fb, size), numblocks, blocksize);
return EXIT_SUCCESS;
}
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