2017-10-23 13:40:38 +02:00
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/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2017 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/magic.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/vfs.h>
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2017-11-21 18:56:52 +01:00
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#include "crypt-util.h"
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2017-10-23 13:40:38 +02:00
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#include "device-nodes.h"
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2017-11-21 18:56:52 +01:00
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#include "dissect-image.h"
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2017-10-23 13:40:38 +02:00
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#include "escape.h"
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#include "fd-util.h"
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#include "format-util.h"
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#include "log.h"
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#include "missing.h"
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#include "mount-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "strv.h"
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2017-11-21 18:55:07 +01:00
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static int resize_ext4(const char *path, int mountfd, int devfd, uint64_t numblocks, uint64_t blocksize) {
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2017-10-23 13:40:38 +02:00
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assert((uint64_t) (int) blocksize == blocksize);
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if (ioctl(mountfd, EXT4_IOC_RESIZE_FS, &numblocks) != 0)
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2017-11-21 18:55:07 +01:00
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return log_error_errno(errno, "Failed to resize \"%s\" to %"PRIu64" blocks (ext4): %m",
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path, numblocks);
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2017-10-23 13:40:38 +02:00
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return 0;
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}
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2017-11-21 18:55:07 +01:00
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static int resize_btrfs(const char *path, int mountfd, int devfd, uint64_t numblocks, uint64_t blocksize) {
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2017-10-23 13:40:38 +02:00
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struct btrfs_ioctl_vol_args args = {};
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int r;
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assert((uint64_t) (int) blocksize == blocksize);
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2017-11-21 18:55:07 +01:00
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/* https://bugzilla.kernel.org/show_bug.cgi?id=118111 */
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if (numblocks * blocksize < 256*1024*1024) {
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log_warning("%s: resizing of btrfs volumes smaller than 256M is not supported", path);
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return -EOPNOTSUPP;
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}
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2017-10-23 13:40:38 +02:00
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r = snprintf(args.name, sizeof(args.name), "%"PRIu64, numblocks * blocksize);
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/* The buffer is large enough for any number to fit... */
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assert((size_t) r < sizeof(args.name));
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if (ioctl(mountfd, BTRFS_IOC_RESIZE, &args) != 0)
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2017-11-21 18:55:07 +01:00
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return log_error_errno(errno, "Failed to resize \"%s\" to %"PRIu64" blocks (btrfs): %m",
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path, numblocks);
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2017-10-23 13:40:38 +02:00
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return 0;
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}
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2017-11-21 18:56:52 +01:00
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static int resize_crypt_luks_device(dev_t devno, const char *fstype, dev_t main_devno) {
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char devpath[DEV_NUM_PATH_MAX], main_devpath[DEV_NUM_PATH_MAX];
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_cleanup_close_ int main_devfd = -1;
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_cleanup_(crypt_freep) struct crypt_device *cd = NULL;
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uint64_t size;
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int r;
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xsprintf_dev_num_path(main_devpath, "block", main_devno);
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main_devfd = open(main_devpath, O_RDONLY|O_CLOEXEC);
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if (main_devfd < 0)
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return log_error_errno(errno, "Failed to open \"%s\": %m", main_devpath);
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if (ioctl(main_devfd, BLKGETSIZE64, &size) != 0)
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return log_error_errno(errno, "Failed to query size of \"%s\" (before resize): %m",
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main_devpath);
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log_debug("%s is %"PRIu64" bytes", main_devpath, size);
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xsprintf_dev_num_path(devpath, "block", devno);
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r = crypt_init(&cd, devpath);
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if (r < 0)
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return log_error_errno(r, "crypt_init(\"%s\") failed: %m", devpath);
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crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
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r = crypt_load(cd, CRYPT_LUKS, NULL);
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if (r < 0)
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return log_debug_errno(r, "Failed to load LUKS metadata for %s: %m", devpath);
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r = crypt_resize(cd, main_devpath, 0);
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if (r < 0)
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return log_error_errno(r, "crypt_resize() of %s failed: %m", devpath);
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if (ioctl(main_devfd, BLKGETSIZE64, &size) != 0)
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log_warning_errno(errno, "Failed to query size of \"%s\" (after resize): %m",
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devpath);
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else
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log_debug("%s is now %"PRIu64" bytes", main_devpath, size);
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return 1;
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}
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static int maybe_resize_slave_device(const char *mountpath, dev_t main_devno) {
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dev_t devno;
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char devpath[DEV_NUM_PATH_MAX];
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_cleanup_free_ char *fstype = NULL;
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int r;
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crypt_set_log_callback(NULL, cryptsetup_log_glue, NULL);
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crypt_set_debug_level(1);
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r = get_block_device_harder(mountpath, &devno);
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if (r < 0)
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return log_error_errno(r, "Failed to determine underlying block device of \"%s\": %m",
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mountpath);
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log_debug("Underlying device %d:%d, main dev %d:%d, %s",
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major(devno), minor(devno),
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major(main_devno), minor(main_devno),
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devno == main_devno ? "same" : "different");
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if (devno == main_devno)
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return 0;
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xsprintf_dev_num_path(devpath, "block", devno);
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r = probe_filesystem(devpath, &fstype);
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if (r < 0)
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return log_warning_errno(r, "Failed to probe \"%s\": %m", devpath);
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if (streq_ptr(fstype, "crypto_LUKS"))
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return resize_crypt_luks_device(devno, fstype, main_devno);
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log_debug("Don't know how to resize %s of type %s, ignoring", devpath, strnull(fstype));
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return 0;
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}
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2017-10-23 13:40:38 +02:00
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int main(int argc, char *argv[]) {
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dev_t devno;
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_cleanup_close_ int mountfd = -1, devfd = -1;
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int blocksize;
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uint64_t size, numblocks;
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char devpath[DEV_NUM_PATH_MAX], fb[FORMAT_BYTES_MAX];
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struct statfs sfs;
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int r;
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if (argc != 2) {
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log_error("This program requires one argument (the mountpoint).");
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return EXIT_FAILURE;
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}
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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r = path_is_mount_point(argv[1], NULL, 0);
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if (r < 0) {
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log_error_errno(r, "Failed to check if \"%s\" is a mount point: %m", argv[1]);
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return EXIT_FAILURE;
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}
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if (r == 0) {
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log_error_errno(r, "\"%s\" is not a mount point: %m", argv[1]);
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return EXIT_FAILURE;
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}
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r = get_block_device(argv[1], &devno);
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if (r < 0) {
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log_error_errno(r, "Failed to determine block device of \"%s\": %m", argv[1]);
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return EXIT_FAILURE;
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}
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2017-11-21 18:56:52 +01:00
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r = maybe_resize_slave_device(argv[1], devno);
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if (r < 0)
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return EXIT_FAILURE;
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2017-10-23 13:40:38 +02:00
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mountfd = open(argv[1], O_RDONLY|O_CLOEXEC);
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if (mountfd < 0) {
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log_error_errno(errno, "Failed to open \"%s\": %m", argv[1]);
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return EXIT_FAILURE;
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}
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xsprintf_dev_num_path(devpath, "block", devno);
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devfd = open(devpath, O_RDONLY|O_CLOEXEC);
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if (devfd < 0) {
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log_error_errno(errno, "Failed to open \"%s\": %m", devpath);
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return EXIT_FAILURE;
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}
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if (ioctl(devfd, BLKBSZGET, &blocksize) != 0) {
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log_error_errno(errno, "Failed to query block size of \"%s\": %m", devpath);
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return EXIT_FAILURE;
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}
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if (ioctl(devfd, BLKGETSIZE64, &size) != 0) {
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log_error_errno(errno, "Failed to query size of \"%s\": %m", devpath);
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return EXIT_FAILURE;
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}
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if (size % blocksize != 0)
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log_notice("Partition size %"PRIu64" is not a multiple of the blocksize %d,"
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" ignoring %"PRIu64" bytes", size, blocksize, size % blocksize);
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numblocks = size / blocksize;
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if (fstatfs(mountfd, &sfs) < 0) {
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log_error_errno(errno, "Failed to stat file system \"%s\": %m", argv[1]);
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return EXIT_FAILURE;
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}
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switch(sfs.f_type) {
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case EXT4_SUPER_MAGIC:
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2017-11-21 18:55:07 +01:00
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r = resize_ext4(argv[1], mountfd, devfd, numblocks, blocksize);
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2017-10-23 13:40:38 +02:00
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break;
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case BTRFS_SUPER_MAGIC:
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2017-11-21 18:55:07 +01:00
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r = resize_btrfs(argv[1], mountfd, devfd, numblocks, blocksize);
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2017-10-23 13:40:38 +02:00
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break;
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default:
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log_error("Don't know how to resize fs %llx on \"%s\"",
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(long long unsigned) sfs.f_type, argv[1]);
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return EXIT_FAILURE;
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}
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2017-11-21 18:55:07 +01:00
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if (r < 0)
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2017-10-23 13:40:38 +02:00
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return EXIT_FAILURE;
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log_info("Successfully resized \"%s\" to %s bytes (%"PRIu64" blocks of %d bytes).",
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argv[1], format_bytes(fb, sizeof fb, size), numblocks, blocksize);
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return EXIT_SUCCESS;
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}
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