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-rw-r--r--src/partition/growfs.c328
1 files changed, 328 insertions, 0 deletions
diff --git a/src/partition/growfs.c b/src/partition/growfs.c
new file mode 100644
index 0000000..c9d1c27
--- /dev/null
+++ b/src/partition/growfs.c
@@ -0,0 +1,328 @@
+/* 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 "mountpoint-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "pretty-print.h"
+#include "stat-util.h"
+#include "strv.h"
+
+static const char *arg_target = NULL;
+static 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) {
+ _cleanup_free_ char *devpath = NULL, *main_devpath = NULL;
+ _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+ _cleanup_close_ int main_devfd = -1;
+ uint64_t size;
+ int r;
+
+ r = device_path_make_major_minor(S_IFBLK, main_devno, &main_devpath);
+ if (r < 0)
+ return log_error_errno(r, "Failed to format device major/minor path: %m");
+
+ 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);
+ r = device_path_make_major_minor(S_IFBLK, devno, &devpath);
+ if (r < 0)
+ return log_error_errno(r, "Failed to format major/minor path: %m");
+
+ 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) {
+ _cleanup_free_ char *fstype = NULL, *devpath = NULL;
+ dev_t devno;
+ 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;
+
+ r = device_path_make_major_minor(S_IFBLK, devno, &devpath);
+ if (r < 0)
+ return log_error_errno(r, "Failed to format device major/minor path: %m");
+
+ 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("Unhandled option");
+ }
+
+ 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;
+}
+
+int main(int argc, char *argv[]) {
+ _cleanup_close_ int mountfd = -1, devfd = -1;
+ _cleanup_free_ char *devpath = NULL;
+ uint64_t size, numblocks;
+ char fb[FORMAT_BYTES_MAX];
+ struct statfs sfs;
+ dev_t devno;
+ int blocksize;
+ int r;
+
+ log_setup_service();
+
+ 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;
+ }
+
+ r = device_path_make_major_minor(S_IFBLK, devno, &devpath);
+ if (r < 0) {
+ log_error_errno(r, "Failed to format device major/minor path: %m");
+ return EXIT_FAILURE;
+ }
+
+ 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;
+}