diff options
Diffstat (limited to 'src/partition/growfs.c')
| -rw-r--r-- | src/partition/growfs.c | 328 |
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; +} |