diff options
Diffstat (limited to 'src/partition/growfs.c')
| -rw-r--r-- | src/partition/growfs.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/src/partition/growfs.c b/src/partition/growfs.c new file mode 100644 index 0000000..6280a24 --- /dev/null +++ b/src/partition/growfs.c @@ -0,0 +1,276 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <errno.h> +#include <fcntl.h> +#include <getopt.h> +#include <linux/magic.h> +#include <sys/ioctl.h> +#include <sys/mount.h> +#include <sys/types.h> +#include <sys/vfs.h> +/* This needs to be included after sys/mount.h, as since [0] linux/btrfs.h + * includes linux/fs.h causing build errors + * See: https://github.com/systemd/systemd/issues/8507 + * [0] https://github.com/torvalds/linux/commit/a28135303a669917002f569aecebd5758263e4aa + */ +#include <linux/btrfs.h> + +#include "sd-device.h" + +#include "blockdev-util.h" +#include "btrfs-util.h" +#include "cryptsetup-util.h" +#include "device-nodes.h" +#include "device-util.h" +#include "devnum-util.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"); + + main_devfd = r = device_open_from_devnum(S_IFBLK, main_devno, O_RDONLY|O_CLOEXEC, &main_devpath); + if (r < 0) + return log_error_errno(r, "Failed to open main block device " DEVNUM_FORMAT_STR ": %m", + DEVNUM_FORMAT_VAL(main_devno)); + + 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 = devname_from_devnum(S_IFBLK, devno, &devpath); + if (r < 0) + return log_error_errno(r, "Failed to get devpath of " DEVNUM_FORMAT_STR ": %m", + DEVNUM_FORMAT_VAL(devno)); + + 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( + int mountfd, + const char *mountpath, + dev_t main_devno) { + + _cleanup_free_ char *devpath = NULL, *fstype = NULL; + dev_t devno; + int r; + + assert(mountfd >= 0); + assert(mountpath); + +#if HAVE_LIBCRYPTSETUP + cryptsetup_enable_logging(NULL); +#endif + + r = get_block_device_harder_fd(mountfd, &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 " DEVNUM_FORMAT_STR ", main dev " DEVNUM_FORMAT_STR ", %s", + DEVNUM_FORMAT_VAL(devno), + DEVNUM_FORMAT_VAL(main_devno), + devno == main_devno ? "same" : "different"); + if (devno == main_devno) + return 0; + + r = devname_from_devnum(S_IFBLK, devno, &devpath); + if (r < 0) + return log_error_errno(r, "Failed to get devpath for block device " DEVNUM_FORMAT_STR ": %m", + DEVNUM_FORMAT_VAL(devno)); + + 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(); + } + + 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; + dev_t devno; + int r; + + log_setup(); + + 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); + + mountfd = open(arg_target, O_RDONLY|O_CLOEXEC|O_DIRECTORY); + if (mountfd < 0) + return log_error_errno(errno, "Failed to open \"%s\": %m", arg_target); + + r = get_block_device_fd(mountfd, &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(mountfd, arg_target, devno); + if (r < 0) + log_warning_errno(r, "Unable to resize underlying device of \"%s\", proceeding anyway: %m", arg_target); + + devfd = r = device_open_from_devnum(S_IFBLK, devno, O_RDONLY|O_CLOEXEC, &devpath); + if (r < 0) + return log_error_errno(r, "Failed to open block device " DEVNUM_FORMAT_STR ": %m", + DEVNUM_FORMAT_VAL(devno)); + + 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); + + if (arg_dry_run) + return 0; + + 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(newsize)); + else + log_info("Successfully resized \"%s\" to %s bytes (%"PRIu64" bytes lost due to blocksize).", + arg_target, + FORMAT_BYTES(newsize), + size - newsize); + return 0; +} + +DEFINE_MAIN_FUNCTION(run); |