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-rw-r--r--src/partition/growfs.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/src/partition/growfs.c b/src/partition/growfs.c
new file mode 100644
index 0000000..9406ae8
--- /dev/null
+++ b/src/partition/growfs.c
@@ -0,0 +1,261 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <linux/btrfs.h>
+#include <linux/magic.h>
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+#include <sys/types.h>
+#include <sys/vfs.h>
+
+#include "blockdev-util.h"
+#include "btrfs-util.h"
+#include "cryptsetup-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 "main-func.h"
+#include "mountpoint-util.h"
+#include "parse-util.h"
+#include "pretty-print.h"
+#include "resize-fs.h"
+
+static const char *arg_target = NULL;
+static bool arg_dry_run = false;
+
+#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_(sym_crypt_freep) struct crypt_device *cd = NULL;
+ _cleanup_close_ int main_devfd = -1;
+ uint64_t size;
+ int r;
+
+ r = dlopen_cryptsetup();
+ if (r < 0)
+ return log_error_errno(r, "Cannot resize LUKS device: %m");
+
+ 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 = sym_crypt_init(&cd, devpath);
+ if (r < 0)
+ return log_error_errno(r, "crypt_init(\"%s\") failed: %m", devpath);
+
+ cryptsetup_enable_logging(cd);
+
+ r = sym_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 = sym_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_underlying_device(const char *mountpath, dev_t main_devno) {
+ _cleanup_free_ char *fstype = NULL, *devpath = NULL;
+ dev_t devno;
+ int r;
+
+#if HAVE_LIBCRYPTSETUP
+ cryptsetup_enable_logging(NULL);
+#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);
+ if (devno == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "File system \"%s\" not backed by block device.", arg_target);
+
+ 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;
+}
+
+static int run(int argc, char *argv[]) {
+ _cleanup_close_ int mountfd = -1, devfd = -1;
+ _cleanup_free_ char *devpath = NULL;
+ uint64_t size, newsize;
+ char fb[FORMAT_BYTES_MAX];
+ dev_t devno;
+ int r;
+
+ log_setup_service();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r;
+
+ r = path_is_mount_point(arg_target, NULL, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to check if \"%s\" is a mount point: %m", arg_target);
+ if (r == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "\"%s\" is not a mount point: %m", arg_target);
+
+ r = get_block_device(arg_target, &devno);
+ if (r == -EUCLEAN)
+ return btrfs_log_dev_root(LOG_ERR, r, arg_target);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine block device of \"%s\": %m", arg_target);
+ if (devno == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "File system \"%s\" not backed by block device.", arg_target);
+
+ r = maybe_resize_underlying_device(arg_target, devno);
+ if (r < 0)
+ return r;
+
+ mountfd = open(arg_target, O_RDONLY|O_CLOEXEC);
+ if (mountfd < 0)
+ return log_error_errno(errno, "Failed to open \"%s\": %m", arg_target);
+
+ 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");
+
+ devfd = open(devpath, O_RDONLY|O_CLOEXEC);
+ if (devfd < 0)
+ return log_error_errno(errno, "Failed to open \"%s\": %m", devpath);
+
+ if (ioctl(devfd, BLKGETSIZE64, &size) != 0)
+ return log_error_errno(errno, "Failed to query size of \"%s\": %m", devpath);
+
+ log_debug("Resizing \"%s\" to %"PRIu64" bytes...", arg_target, size);
+ r = resize_fs(mountfd, size, &newsize);
+ if (r < 0)
+ return log_error_errno(r, "Failed to resize \"%s\" to %"PRIu64" bytes: %m",
+ arg_target, size);
+ if (newsize == size)
+ log_info("Successfully resized \"%s\" to %s bytes.",
+ arg_target,
+ format_bytes(fb, sizeof fb, newsize));
+ else
+ log_info("Successfully resized \"%s\" to %s bytes (%"PRIu64" bytes lost due to blocksize).",
+ arg_target,
+ format_bytes(fb, sizeof fb, newsize),
+ size - newsize);
+ return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 16:14:14 +0000