src/partition/growfs.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <getopt.h>
   6 #include <linux/btrfs.h>
   7 #include <linux/magic.h>
   8 #include <sys/ioctl.h>
   9 #include <sys/mount.h>
  10 #include <sys/types.h>
  11 #include <sys/vfs.h>
  12
  13 #include "blockdev-util.h"
  14 #include "crypt-util.h"
  15 #include "device-nodes.h"
  16 #include "dissect-image.h"
  17 #include "escape.h"
  18 #include "fd-util.h"
  19 #include "format-util.h"
  20 #include "log.h"
  21 #include "main-func.h"
  22 #include "mountpoint-util.h"
  23 #include "parse-util.h"
  24 #include "pretty-print.h"
  25 #include "resize-fs.h"
  26
  27 static const char *arg_target = NULL;
  28 static bool arg_dry_run = false;
  29
  30 #if HAVE_LIBCRYPTSETUP
  31 static int resize_crypt_luks_device(dev_t devno, const char *fstype, dev_t main_devno) {
  32         _cleanup_free_ char *devpath = NULL, *main_devpath = NULL;
  33         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
  34         _cleanup_close_ int main_devfd = -1;
  35         uint64_t size;
  36         int r;
  37
  38         r = device_path_make_major_minor(S_IFBLK, main_devno, &main_devpath);
  39         if (r < 0)
  40                 return log_error_errno(r, "Failed to format device major/minor path: %m");
  41
  42         main_devfd = open(main_devpath, O_RDONLY|O_CLOEXEC);
  43         if (main_devfd < 0)
  44                 return log_error_errno(errno, "Failed to open \"%s\": %m", main_devpath);
  45
  46         if (ioctl(main_devfd, BLKGETSIZE64, &size) != 0)
  47                 return log_error_errno(errno, "Failed to query size of \"%s\" (before resize): %m",
  48                                        main_devpath);
  49
  50         log_debug("%s is %"PRIu64" bytes", main_devpath, size);
  51         r = device_path_make_major_minor(S_IFBLK, devno, &devpath);
  52         if (r < 0)
  53                 return log_error_errno(r, "Failed to format major/minor path: %m");
  54
  55         r = crypt_init(&cd, devpath);
  56         if (r < 0)
  57                 return log_error_errno(r, "crypt_init(\"%s\") failed: %m", devpath);
  58
  59         crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
  60
  61         r = crypt_load(cd, CRYPT_LUKS, NULL);
  62         if (r < 0)
  63                 return log_debug_errno(r, "Failed to load LUKS metadata for %s: %m", devpath);
  64
  65         if (arg_dry_run)
  66                 return 0;
  67
  68         r = crypt_resize(cd, main_devpath, 0);
  69         if (r < 0)
  70                 return log_error_errno(r, "crypt_resize() of %s failed: %m", devpath);
  71
  72         if (ioctl(main_devfd, BLKGETSIZE64, &size) != 0)
  73                 log_warning_errno(errno, "Failed to query size of \"%s\" (after resize): %m",
  74                                   devpath);
  75         else
  76                 log_debug("%s is now %"PRIu64" bytes", main_devpath, size);
  77
  78         return 1;
  79 }
  80 #endif
  81
  82 static int maybe_resize_underlying_device(const char *mountpath, dev_t main_devno) {
  83         _cleanup_free_ char *fstype = NULL, *devpath = NULL;
  84         dev_t devno;
  85         int r;
  86
  87 #if HAVE_LIBCRYPTSETUP
  88         crypt_set_log_callback(NULL, cryptsetup_log_glue, NULL);
  89         if (DEBUG_LOGGING)
  90                 crypt_set_debug_level(CRYPT_DEBUG_ALL);
  91 #endif
  92
  93         r = get_block_device_harder(mountpath, &devno);
  94         if (r < 0)
  95                 return log_error_errno(r, "Failed to determine underlying block device of \"%s\": %m",
  96                                        mountpath);
  97
  98         log_debug("Underlying device %d:%d, main dev %d:%d, %s",
  99                   major(devno), minor(devno),
 100                   major(main_devno), minor(main_devno),
 101                   devno == main_devno ? "same" : "different");
 102         if (devno == main_devno)
 103                 return 0;
 104
 105         r = device_path_make_major_minor(S_IFBLK, devno, &devpath);
 106         if (r < 0)
 107                 return log_error_errno(r, "Failed to format device major/minor path: %m");
 108
 109         r = probe_filesystem(devpath, &fstype);
 110         if (r == -EUCLEAN)
 111                 return log_warning_errno(r, "Cannot reliably determine probe \"%s\", refusing to proceed.", devpath);
 112         if (r < 0)
 113                 return log_warning_errno(r, "Failed to probe \"%s\": %m", devpath);
 114
 115 #if HAVE_LIBCRYPTSETUP
 116         if (streq_ptr(fstype, "crypto_LUKS"))
 117                 return resize_crypt_luks_device(devno, fstype, main_devno);
 118 #endif
 119
 120         log_debug("Don't know how to resize %s of type %s, ignoring.", devpath, strnull(fstype));
 121         return 0;
 122 }
 123
 124 static int help(void) {
 125         _cleanup_free_ char *link = NULL;
 126         int r;
 127
 128         r = terminal_urlify_man("systemd-growfs@.service", "8", &link);
 129         if (r < 0)
 130                 return log_oom();
 131
 132         printf("%s [OPTIONS...] /path/to/mountpoint\n\n"
 133                "Grow filesystem or encrypted payload to device size.\n\n"
 134                "Options:\n"
 135                "  -h --help          Show this help and exit\n"
 136                "     --version       Print version string and exit\n"
 137                "  -n --dry-run       Just print what would be done\n"
 138                "\nSee the %s for details.\n"
 139                , program_invocation_short_name
 140                , link
 141         );
 142
 143         return 0;
 144 }
 145
 146 static int parse_argv(int argc, char *argv[]) {
 147         enum {
 148                 ARG_VERSION = 0x100,
 149         };
 150
 151         int c;
 152
 153         static const struct option options[] = {
 154                 { "help",         no_argument,       NULL, 'h'           },
 155                 { "version" ,     no_argument,       NULL, ARG_VERSION   },
 156                 { "dry-run",      no_argument,       NULL, 'n'           },
 157                 {}
 158         };
 159
 160         assert(argc >= 0);
 161         assert(argv);
 162
 163         while ((c = getopt_long(argc, argv, "hn", options, NULL)) >= 0)
 164                 switch(c) {
 165                 case 'h':
 166                         return help();
 167
 168                 case ARG_VERSION:
 169                         return version();
 170
 171                 case 'n':
 172                         arg_dry_run = true;
 173                         break;
 174
 175                 case '?':
 176                         return -EINVAL;
 177
 178                 default:
 179                         assert_not_reached("Unhandled option");
 180                 }
 181
 182         if (optind + 1 != argc)
 183                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 184                                        "%s excepts exactly one argument (the mount point).",
 185                                        program_invocation_short_name);
 186
 187         arg_target = argv[optind];
 188
 189         return 1;
 190 }
 191
 192 static int run(int argc, char *argv[]) {
 193         _cleanup_close_ int mountfd = -1, devfd = -1;
 194         _cleanup_free_ char *devpath = NULL;
 195         uint64_t size, newsize;
 196         char fb[FORMAT_BYTES_MAX];
 197         dev_t devno;
 198         int r;
 199
 200         log_setup_service();
 201
 202         r = parse_argv(argc, argv);
 203         if (r <= 0)
 204                 return r;
 205
 206         r = path_is_mount_point(arg_target, NULL, 0);
 207         if (r < 0)
 208                 return log_error_errno(r, "Failed to check if \"%s\" is a mount point: %m", arg_target);
 209         if (r == 0)
 210                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "\"%s\" is not a mount point: %m", arg_target);
 211
 212         r = get_block_device(arg_target, &devno);
 213         if (r < 0)
 214                 return log_error_errno(r, "Failed to determine block device of \"%s\": %m", arg_target);
 215
 216         r = maybe_resize_underlying_device(arg_target, devno);
 217         if (r < 0)
 218                 return r;
 219
 220         mountfd = open(arg_target, O_RDONLY|O_CLOEXEC);
 221         if (mountfd < 0)
 222                 return log_error_errno(errno, "Failed to open \"%s\": %m", arg_target);
 223
 224         r = device_path_make_major_minor(S_IFBLK, devno, &devpath);
 225         if (r < 0)
 226                 return log_error_errno(r, "Failed to format device major/minor path: %m");
 227
 228         devfd = open(devpath, O_RDONLY|O_CLOEXEC);
 229         if (devfd < 0)
 230                 return log_error_errno(errno, "Failed to open \"%s\": %m", devpath);
 231
 232         if (ioctl(devfd, BLKGETSIZE64, &size) != 0)
 233                 return log_error_errno(errno, "Failed to query size of \"%s\": %m", devpath);
 234
 235         log_debug("Resizing \"%s\" to %"PRIu64" bytes...", arg_target, size);
 236         r = resize_fs(mountfd, size, &newsize);
 237         if (r < 0)
 238                 return log_error_errno(r, "Failed to resize \"%s\" to %"PRIu64" bytes: %m",
 239                                        arg_target, size);
 240         if (newsize == size)
 241                 log_info("Successfully resized \"%s\" to %s bytes.",
 242                          arg_target,
 243                          format_bytes(fb, sizeof fb, newsize));
 244         else
 245                 log_info("Successfully resized \"%s\" to %s bytes (%"PRIu64" bytes lost due to blocksize).",
 246                          arg_target,
 247                          format_bytes(fb, sizeof fb, newsize),
 248                          size - newsize);
 249         return 0;
 250 }
 251
 252 DEFINE_MAIN_FUNCTION(run);