315 lines
10 KiB
C
315 lines
10 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.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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#include "blockdev-util.h"
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#include "crypt-util.h"
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#include "device-nodes.h"
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#include "dissect-image.h"
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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 "pretty-print.h"
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#include "strv.h"
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static const char *arg_target = NULL;
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static bool arg_dry_run = false;
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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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assert((uint64_t) (int) blocksize == blocksize);
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if (arg_dry_run)
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return 0;
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if (ioctl(mountfd, EXT4_IOC_RESIZE_FS, &numblocks) != 0)
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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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return 0;
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}
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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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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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/* 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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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 (arg_dry_run)
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return 0;
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if (ioctl(mountfd, BTRFS_IOC_RESIZE, &args) != 0)
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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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return 0;
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}
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#if HAVE_LIBCRYPTSETUP
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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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if (arg_dry_run)
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return 0;
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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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#endif
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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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#if HAVE_LIBCRYPTSETUP
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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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#endif
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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 == -EUCLEAN)
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return log_warning_errno(r, "Cannot reliably determine probe \"%s\", refusing to proceed.", devpath);
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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 HAVE_LIBCRYPTSETUP
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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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#endif
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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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static int help(void) {
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_cleanup_free_ char *link = NULL;
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int r;
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r = terminal_urlify_man("systemd-growfs@.service", "8", &link);
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if (r < 0)
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return log_oom();
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printf("%s [OPTIONS...] /path/to/mountpoint\n\n"
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"Grow filesystem or encrypted payload to device size.\n\n"
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"Options:\n"
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" -h --help Show this help and exit\n"
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" --version Print version string and exit\n"
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" -n --dry-run Just print what would be done\n"
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"\nSee the %s for details.\n"
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, program_invocation_short_name
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, link
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);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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};
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int c;
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version" , no_argument, NULL, ARG_VERSION },
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{ "dry-run", no_argument, NULL, 'n' },
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{}
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};
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "hn", options, NULL)) >= 0)
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switch(c) {
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case 'h':
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return help();
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case ARG_VERSION:
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return version();
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case 'n':
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arg_dry_run = true;
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break;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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if (optind + 1 != argc)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"%s excepts exactly one argument (the mount point).",
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program_invocation_short_name);
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arg_target = argv[optind];
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return 1;
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}
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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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log_setup_service();
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r = parse_argv(argc, argv);
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if (r < 0)
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return EXIT_FAILURE;
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if (r == 0)
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return EXIT_SUCCESS;
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r = path_is_mount_point(arg_target, 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", arg_target);
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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", arg_target);
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return EXIT_FAILURE;
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}
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r = get_block_device(arg_target, &devno);
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if (r < 0) {
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log_error_errno(r, "Failed to determine block device of \"%s\": %m", arg_target);
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return EXIT_FAILURE;
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}
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r = maybe_resize_slave_device(arg_target, devno);
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if (r < 0)
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return EXIT_FAILURE;
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mountfd = open(arg_target, O_RDONLY|O_CLOEXEC);
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if (mountfd < 0) {
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log_error_errno(errno, "Failed to open \"%s\": %m", arg_target);
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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", arg_target);
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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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r = resize_ext4(arg_target, mountfd, devfd, numblocks, blocksize);
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break;
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case BTRFS_SUPER_MAGIC:
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r = resize_btrfs(arg_target, mountfd, devfd, numblocks, blocksize);
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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, arg_target);
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return EXIT_FAILURE;
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}
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if (r < 0)
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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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arg_target, format_bytes(fb, sizeof fb, size), numblocks, blocksize);
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return EXIT_SUCCESS;
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}
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