| | 1 | /* |
| | 2 | * SPDX-License-Identifier: GPL-2.0-or-later |
| | 3 | * |
| | 4 | * This program is free software; you can redistribute it and/or modify |
| | 5 | * it under the terms of the GNU General Public License as published by |
| | 6 | * the Free Software Foundation; either version 2 of the License, or |
| | 7 | * (at your option) any later version. |
| | 8 | * |
| | 9 | * Original implementation from Ted Ts'o; losetup was part of mount. |
| | 10 | * |
| | 11 | * Copyright (C) 2011-2023 Karel Zak <kzak@redhat.com> |
| | 12 | * |
| | 13 | * losetup.c - setup and control loop devices |
| | 14 | */ |
| | 15 | #include <assert.h> |
| | 16 | #include <stdio.h> |
| | 17 | #include <string.h> |
| | 18 | #include <errno.h> |
| | 19 | #include <stdlib.h> |
| | 20 | #include <unistd.h> |
| | 21 | #include <sys/ioctl.h> |
| | 22 | #include <sys/stat.h> |
| | 23 | #include <inttypes.h> |
| | 24 | #include <getopt.h> |
| | 25 | |
| | 26 | #include <libsmartcols.h> |
| | 27 | |
| | 28 | #include "c.h" |
| | 29 | #include "cctype.h" |
| | 30 | #include "nls.h" |
| | 31 | #include "strutils.h" |
| | 32 | #include "loopdev.h" |
| | 33 | #include "closestream.h" |
| | 34 | #include "optutils.h" |
| | 35 | #include "xalloc.h" |
| | 36 | #include "canonicalize.h" |
| | 37 | #include "pathnames.h" |
| | 38 | |
| | 39 | enum { |
| | 40 | A_CREATE = 1, /* setup a new device */ |
| | 41 | A_DELETE, /* delete given device(s) */ |
| | 42 | A_DELETE_ALL, /* delete all devices */ |
| | 43 | A_SHOW, /* list devices */ |
| | 44 | A_SHOW_ONE, /* print info about one device */ |
| | 45 | A_FIND_FREE, /* find first unused */ |
| | 46 | A_SET_CAPACITY, /* set device capacity */ |
| | 47 | A_SET_DIRECT_IO, /* set accessing backing file by direct io */ |
| | 48 | A_SET_BLOCKSIZE, /* set logical block size of the loop device */ |
| | 49 | }; |
| | 50 | |
| | 51 | enum { |
| | 52 | COL_NAME = 0, |
| | 53 | COL_AUTOCLR, |
| | 54 | COL_BACK_FILE, |
| | 55 | COL_BACK_INO, |
| | 56 | COL_BACK_MAJMIN, |
| | 57 | COL_BACK_MAJ, |
| | 58 | COL_BACK_MIN, |
| | 59 | COL_MAJMIN, |
| | 60 | COL_MAJ, |
| | 61 | COL_MIN, |
| | 62 | COL_OFFSET, |
| | 63 | COL_PARTSCAN, |
| | 64 | COL_REF, |
| | 65 | COL_RO, |
| | 66 | COL_SIZELIMIT, |
| | 67 | COL_DIO, |
| | 68 | COL_LOGSEC, |
| | 69 | }; |
| | 70 | |
| | 71 | /* basic output flags */ |
| | 72 | static int no_headings; |
| | 73 | static int raw; |
| | 74 | static int json; |
| | 75 | |
| | 76 | struct colinfo { |
| | 77 | const char * const name; |
| | 78 | double whint; |
| | 79 | int flags; |
| | 80 | const char *help; |
| | 81 | |
| | 82 | int json_type; /* default is string */ |
| | 83 | }; |
| | 84 | |
| | 85 | static const struct colinfo infos[] = { |
| | 86 | [COL_AUTOCLR] = { "AUTOCLEAR", 1, SCOLS_FL_RIGHT, N_("autoclear flag set"), SCOLS_JSON_BOOLEAN}, |
| | 87 | [COL_BACK_FILE] = { "BACK-FILE", 0.3, SCOLS_FL_NOEXTREMES, N_("device backing file")}, |
| | 88 | [COL_BACK_INO] = { "BACK-INO", 4, SCOLS_FL_RIGHT, N_("backing file inode number"), SCOLS_JSON_NUMBER}, |
| | 89 | [COL_BACK_MAJMIN] = { "BACK-MAJ:MIN", 6, 0, N_("backing file major:minor device number")}, |
| | 90 | [COL_BACK_MAJ] = { "BACK-MAJ", 6, 0, N_("backing file major device number")}, |
| | 91 | [COL_BACK_MIN] = { "BACK-MIN", 6, 0, N_("backing file minor device number")}, |
| | 92 | [COL_NAME] = { "NAME", 0.25, 0, N_("loop device name")}, |
| | 93 | [COL_OFFSET] = { "OFFSET", 5, SCOLS_FL_RIGHT, N_("offset from the beginning"), SCOLS_JSON_NUMBER}, |
| | 94 | [COL_PARTSCAN] = { "PARTSCAN", 1, SCOLS_FL_RIGHT, N_("partscan flag set"), SCOLS_JSON_BOOLEAN}, |
| | 95 | [COL_REF] = { "REF", 0.1, 0, N_("loop device reference string")}, |
| | 96 | [COL_RO] = { "RO", 1, SCOLS_FL_RIGHT, N_("read-only device"), SCOLS_JSON_BOOLEAN}, |
| | 97 | [COL_SIZELIMIT] = { "SIZELIMIT", 5, SCOLS_FL_RIGHT, N_("size limit of the file in bytes"), SCOLS_JSON_NUMBER}, |
| | 98 | [COL_MAJMIN] = { "MAJ:MIN", 3, 0, N_("loop device major:minor number")}, |
| | 99 | [COL_MAJ] = { "MAJ", 1, SCOLS_FL_RIGHT, N_("loop device major number"), SCOLS_JSON_NUMBER}, |
| | 100 | [COL_MIN] = { "MIN", 1, SCOLS_FL_RIGHT, N_("loop device minor number"), SCOLS_JSON_NUMBER}, |
| | 101 | [COL_DIO] = { "DIO", 1, SCOLS_FL_RIGHT, N_("access backing file with direct-io"), SCOLS_JSON_BOOLEAN}, |
| | 102 | [COL_LOGSEC] = { "LOG-SEC", 4, SCOLS_FL_RIGHT, N_("logical sector size in bytes"), SCOLS_JSON_NUMBER}, |
| | 103 | }; |
| | 104 | |
| | 105 | static int columns[ARRAY_SIZE(infos) * 2] = {-1}; |
| | 106 | static size_t ncolumns; |
| | 107 | |
| | 108 | static int get_column_id(int num) |
| | 109 | { |
| | 110 | assert(num >= 0); |
| | 111 | assert((size_t) num < ncolumns); |
| | 112 | assert(columns[num] < (int) ARRAY_SIZE(infos)); |
| | 113 | return columns[num]; |
| | 114 | } |
| | 115 | |
| | 116 | static const struct colinfo *get_column_info(int num) |
| | 117 | { |
| | 118 | return &infos[ get_column_id(num) ]; |
| | 119 | } |
| | 120 | |
| | 121 | static int column_name_to_id(const char *name, size_t namesz) |
| | 122 | { |
| | 123 | size_t i; |
| | 124 | |
| | 125 | for (i = 0; i < ARRAY_SIZE(infos); i++) { |
| | 126 | const char *cn = infos[i].name; |
| | 127 | |
| | 128 | if (!c_strncasecmp(name, cn, namesz) && !*(cn + namesz)) |
| | 129 | return i; |
| | 130 | } |
| | 131 | warnx(_("unknown column: %s"), name); |
| | 132 | return -1; |
| | 133 | } |
| | 134 | |
| | 135 | static int printf_loopdev(struct loopdev_cxt *lc) |
| | 136 | { |
| | 137 | uint64_t x; |
| | 138 | dev_t dev = 0; |
| | 139 | ino_t ino = 0; |
| | 140 | char *fname; |
| | 141 | uint32_t type; |
| | 142 | |
| | 143 | fname = loopcxt_get_backing_file(lc); |
| | 144 | if (!fname) |
| | 145 | return -EINVAL; |
| | 146 | |
| | 147 | if (loopcxt_get_backing_devno(lc, &dev) == 0) |
| | 148 | loopcxt_get_backing_inode(lc, &ino); |
| | 149 | |
| | 150 | if (!dev && !ino) { |
| | 151 | /* |
| | 152 | * Probably non-root user (no permissions to |
| | 153 | * call LOOP_GET_STATUS ioctls). |
| | 154 | */ |
| | 155 | printf("%s%s: []: (%s)", |
| | 156 | loopcxt_get_device(lc), |
| | 157 | loopcxt_is_lost(lc) ? " (lost)" : "", |
| | 158 | fname); |
| | 159 | |
| | 160 | if (loopcxt_get_offset(lc, &x) == 0 && x) |
| | 161 | printf(_(", offset %ju"), x); |
| | 162 | if (loopcxt_get_sizelimit(lc, &x) == 0 && x) |
| | 163 | printf(_(", sizelimit %ju"), x); |
| | 164 | |
| | 165 | goto done; |
| | 166 | } |
| | 167 | |
| | 168 | printf("%s%s: [%04jd]:%ju (%s)", |
| | 169 | loopcxt_get_device(lc), |
| | 170 | loopcxt_is_lost(lc) ? " (lost)" : "", |
| | 171 | (intmax_t) dev, (uintmax_t) ino, fname); |
| | 172 | |
| | 173 | if (loopcxt_get_offset(lc, &x) == 0 && x) |
| | 174 | printf(_(", offset %ju"), x); |
| | 175 | if (loopcxt_get_sizelimit(lc, &x) == 0 && x) |
| | 176 | printf(_(", sizelimit %ju"), x); |
| | 177 | |
| | 178 | if (loopcxt_get_encrypt_type(lc, &type) == 0) { |
| | 179 | const char *e = loopcxt_get_crypt_name(lc); |
| | 180 | |
| | 181 | if ((!e || !*e) && type == 1) |
| | 182 | e = "XOR"; |
| | 183 | if (e && *e) |
| | 184 | printf(_(", encryption %s (type %u)"), e, type); |
| | 185 | } |
| | 186 | |
| | 187 | done: |
| | 188 | free(fname); |
| | 189 | printf("\n"); |
| | 190 | return 0; |
| | 191 | } |
| | 192 | |
| | 193 | static int show_all_loops(struct loopdev_cxt *lc, const char *file, |
| | 194 | uint64_t offset, int flags) |
| | 195 | { |
| | 196 | struct stat sbuf, *st = &sbuf; |
| | 197 | char *cn_file = NULL; |
| | 198 | |
| | 199 | if (loopcxt_init_iterator(lc, LOOPITER_FL_USED)) |
| | 200 | return -1; |
| | 201 | |
| | 202 | if (!file || stat(file, st)) |
| | 203 | st = NULL; |
| | 204 | |
| | 205 | while (loopcxt_next(lc) == 0) { |
| | 206 | if (file) { |
| | 207 | int used; |
| | 208 | const char *bf = cn_file ? cn_file : file; |
| | 209 | |
| | 210 | used = loopcxt_is_used(lc, st, bf, offset, 0, flags); |
| | 211 | if (!used && !cn_file) { |
| | 212 | bf = cn_file = canonicalize_path(file); |
| | 213 | used = loopcxt_is_used(lc, st, bf, offset, 0, flags); |
| | 214 | } |
| | 215 | if (!used) |
| | 216 | continue; |
| | 217 | } |
| | 218 | printf_loopdev(lc); |
| | 219 | } |
| | 220 | loopcxt_deinit_iterator(lc); |
| | 221 | free(cn_file); |
| | 222 | return 0; |
| | 223 | } |
| | 224 | |
| | 225 | static void warn_lost(struct loopdev_cxt *lc) |
| | 226 | { |
| | 227 | dev_t devno = loopcxt_get_devno(lc); |
| | 228 | |
| | 229 | if (devno <= 0) |
| | 230 | return; |
| | 231 | |
| | 232 | warnx(("device node %s (%u:%u) is lost. You may use mknod(1) to recover it."), |
| | 233 | loopcxt_get_device(lc), major(devno), minor(devno)); |
| | 234 | } |
| | 235 | |
| | 236 | static int delete_loop(struct loopdev_cxt *lc) |
| | 237 | { |
| | 238 | if (loopcxt_delete_device(lc)) { |
| | 239 | warn(_("%s: detach failed"), loopcxt_get_device(lc)); |
| | 240 | if (loopcxt_is_lost(lc)) |
| | 241 | warn_lost(lc); |
| | 242 | } else |
| | 243 | return 0; |
| | 244 | |
| | 245 | return -1; |
| | 246 | } |
| | 247 | |
| | 248 | static int delete_all_loops(struct loopdev_cxt *lc) |
| | 249 | { |
| | 250 | int res = 0; |
| | 251 | |
| | 252 | if (loopcxt_init_iterator(lc, LOOPITER_FL_USED)) |
| | 253 | return -1; |
| | 254 | |
| | 255 | while (loopcxt_next(lc) == 0) |
| | 256 | res += delete_loop(lc); |
| | 257 | |
| | 258 | loopcxt_deinit_iterator(lc); |
| | 259 | return res; |
| | 260 | } |
| | 261 | |
| | 262 | static int set_scols_data(struct loopdev_cxt *lc, struct libscols_line *ln) |
| | 263 | { |
| | 264 | size_t i; |
| | 265 | |
| | 266 | for (i = 0; i < ncolumns; i++) { |
| | 267 | const char *p = NULL; /* external data */ |
| | 268 | char *np = NULL; /* allocated here */ |
| | 269 | uint64_t x = 0; |
| | 270 | int rc = 0; |
| | 271 | |
| | 272 | switch(get_column_id(i)) { |
| | 273 | case COL_NAME: |
| | 274 | p = loopcxt_get_device(lc); |
| | 275 | if (loopcxt_is_lost(lc)) { |
| | 276 | xasprintf(&np, "%s (lost)", p); |
| | 277 | p = NULL; |
| | 278 | } |
| | 279 | break; |
| | 280 | case COL_BACK_FILE: |
| | 281 | np = loopcxt_get_backing_file(lc); |
| | 282 | break; |
| | 283 | case COL_OFFSET: |
| | 284 | if (loopcxt_get_offset(lc, &x) == 0) |
| | 285 | xasprintf(&np, "%jd", x); |
| | 286 | break; |
| | 287 | case COL_SIZELIMIT: |
| | 288 | if (loopcxt_get_sizelimit(lc, &x) == 0) |
| | 289 | xasprintf(&np, "%jd", x); |
| | 290 | break; |
| | 291 | case COL_BACK_MAJMIN: |
| | 292 | { |
| | 293 | dev_t dev = 0; |
| | 294 | if (loopcxt_get_backing_devno(lc, &dev) == 0 && dev) |
| | 295 | xasprintf(&np, raw || json ? "%u:%u" : "%8u:%-3u", |
| | 296 | major(dev), minor(dev)); |
| | 297 | break; |
| | 298 | } |
| | 299 | case COL_BACK_MAJ: |
| | 300 | { |
| | 301 | dev_t dev = 0; |
| | 302 | if (loopcxt_get_backing_devno(lc, &dev) == 0 && dev) |
| | 303 | xasprintf(&np, "%u", major(dev)); |
| | 304 | break; |
| | 305 | } |
| | 306 | case COL_BACK_MIN: |
| | 307 | { |
| | 308 | dev_t dev = 0; |
| | 309 | if (loopcxt_get_backing_devno(lc, &dev) == 0 && dev) |
| | 310 | xasprintf(&np, "%u", minor(dev)); |
| | 311 | break; |
| | 312 | } |
| | 313 | case COL_MAJMIN: |
| | 314 | { |
| | 315 | dev_t dev = loopcxt_get_devno(lc); |
| | 316 | if (dev) |
| | 317 | xasprintf(&np, raw || json ? "%u:%u" :"%3u:%-3u", |
| | 318 | major(dev), minor(dev)); |
| | 319 | break; |
| | 320 | } |
| | 321 | case COL_MAJ: { |
| | 322 | dev_t dev = loopcxt_get_devno(lc); |
| | 323 | if (dev) |
| | 324 | xasprintf(&np, "%u", major(dev)); |
| | 325 | break; |
| | 326 | } |
| | 327 | case COL_MIN: { |
| | 328 | dev_t dev = loopcxt_get_devno(lc); |
| | 329 | if (dev) |
| | 330 | xasprintf(&np, "%u", minor(dev)); |
| | 331 | break; |
| | 332 | } |
| | 333 | case COL_BACK_INO: |
| | 334 | { |
| | 335 | ino_t ino = 0; |
| | 336 | if (loopcxt_get_backing_inode(lc, &ino) == 0 && ino) |
| | 337 | xasprintf(&np, "%ju", ino); |
| | 338 | break; |
| | 339 | } |
| | 340 | case COL_AUTOCLR: |
| | 341 | p = loopcxt_is_autoclear(lc) ? "1" : "0"; |
| | 342 | break; |
| | 343 | case COL_RO: |
| | 344 | p = loopcxt_is_readonly(lc) ? "1" : "0"; |
| | 345 | break; |
| | 346 | case COL_DIO: |
| | 347 | p = loopcxt_is_dio(lc) ? "1" : "0"; |
| | 348 | break; |
| | 349 | case COL_PARTSCAN: |
| | 350 | p = loopcxt_is_partscan(lc) ? "1" : "0"; |
| | 351 | break; |
| | 352 | case COL_LOGSEC: |
| | 353 | if (loopcxt_get_blocksize(lc, &x) == 0) |
| | 354 | xasprintf(&np, "%jd", x); |
| | 355 | break; |
| | 356 | case COL_REF: |
| | 357 | np = loopcxt_get_refname(lc); |
| | 358 | break; |
| | 359 | default: |
| | 360 | return -EINVAL; |
| | 361 | } |
| | 362 | |
| | 363 | |
| | 364 | if (p) |
| | 365 | rc = scols_line_set_data(ln, i, p); /* calls strdup() */ |
| | 366 | else if (np) |
| | 367 | rc = scols_line_refer_data(ln, i, np); /* only refers */ |
| | 368 | |
| | 369 | if (rc) |
| | 370 | err(EXIT_FAILURE, _("failed to add output data")); |
| | 371 | } |
| | 372 | |
| | 373 | return 0; |
| | 374 | } |
| | 375 | |
| | 376 | static int show_table(struct loopdev_cxt *lc, |
| | 377 | const char *file, |
| | 378 | uint64_t offset, |
| | 379 | int flags) |
| | 380 | { |
| | 381 | struct stat sbuf, *st = &sbuf; |
| | 382 | struct libscols_table *tb; |
| | 383 | struct libscols_line *ln; |
| | 384 | int rc = 0; |
| | 385 | size_t i; |
| | 386 | |
| | 387 | scols_init_debug(0); |
| | 388 | |
| | 389 | if (!(tb = scols_new_table())) |
| | 390 | err(EXIT_FAILURE, _("failed to allocate output table")); |
| | 391 | scols_table_enable_raw(tb, raw); |
| | 392 | scols_table_enable_json(tb, json); |
| | 393 | scols_table_enable_noheadings(tb, no_headings); |
| | 394 | |
| | 395 | if (json) |
| | 396 | scols_table_set_name(tb, "loopdevices"); |
| | 397 | |
| | 398 | for (i = 0; i < ncolumns; i++) { |
| | 399 | const struct colinfo *ci = get_column_info(i); |
| | 400 | struct libscols_column *cl; |
| | 401 | |
| | 402 | cl = scols_table_new_column(tb, ci->name, ci->whint, ci->flags); |
| | 403 | if (!cl) |
| | 404 | err(EXIT_FAILURE, _("failed to allocate output column")); |
| | 405 | if (json) |
| | 406 | scols_column_set_json_type(cl, ci->json_type); |
| | 407 | } |
| | 408 | |
| | 409 | /* only one loopdev requested (already assigned to loopdev_cxt) */ |
| | 410 | if (loopcxt_get_device(lc)) { |
| | 411 | ln = scols_table_new_line(tb, NULL); |
| | 412 | if (!ln) |
| | 413 | err(EXIT_FAILURE, _("failed to allocate output line")); |
| | 414 | rc = set_scols_data(lc, ln); |
| | 415 | |
| | 416 | /* list all loopdevs */ |
| | 417 | } else { |
| | 418 | char *cn_file = NULL; |
| | 419 | |
| | 420 | rc = loopcxt_init_iterator(lc, LOOPITER_FL_USED); |
| | 421 | if (rc) |
| | 422 | goto done; |
| | 423 | if (!file || stat(file, st)) |
| | 424 | st = NULL; |
| | 425 | |
| | 426 | while (loopcxt_next(lc) == 0) { |
| | 427 | if (file) { |
| | 428 | int used; |
| | 429 | const char *bf = cn_file ? cn_file : file; |
| | 430 | |
| | 431 | used = loopcxt_is_used(lc, st, bf, offset, 0, flags); |
| | 432 | if (!used && !cn_file) { |
| | 433 | bf = cn_file = canonicalize_path(file); |
| | 434 | used = loopcxt_is_used(lc, st, bf, offset, 0, flags); |
| | 435 | } |
| | 436 | if (!used) |
| | 437 | continue; |
| | 438 | } |
| | 439 | |
| | 440 | ln = scols_table_new_line(tb, NULL); |
| | 441 | if (!ln) |
| | 442 | err(EXIT_FAILURE, _("failed to allocate output line")); |
| | 443 | rc = set_scols_data(lc, ln); |
| | 444 | if (rc) |
| | 445 | break; |
| | 446 | } |
| | 447 | |
| | 448 | loopcxt_deinit_iterator(lc); |
| | 449 | free(cn_file); |
| | 450 | } |
| | 451 | done: |
| | 452 | if (rc == 0) |
| | 453 | rc = scols_print_table(tb); |
| | 454 | scols_unref_table(tb); |
| | 455 | return rc; |
| | 456 | } |
| | 457 | |
| | 458 | static void __attribute__((__noreturn__)) usage(void) |
| | 459 | { |
| | 460 | FILE *out = stdout; |
| | 461 | size_t i; |
| | 462 | |
| | 463 | fputs(USAGE_HEADER, out); |
| | 464 | |
| | 465 | fprintf(out, |
| | 466 | _(" %1$s [options] [<loopdev>]\n" |
| | 467 | " %1$s [options] -f | <loopdev> <file>\n"), |
| | 468 | program_invocation_short_name); |
| | 469 | |
| | 470 | fputs(USAGE_SEPARATOR, out); |
| | 471 | fputs(_("Set up and control loop devices.\n"), out); |
| | 472 | |
| | 473 | /* commands */ |
| | 474 | fputs(USAGE_OPTIONS, out); |
| | 475 | fputs(_(" -a, --all list all used devices\n"), out); |
| | 476 | fputs(_(" -d, --detach <loopdev>... detach one or more devices\n"), out); |
| | 477 | fputs(_(" -D, --detach-all detach all used devices\n"), out); |
| | 478 | fputs(_(" -f, --find find first unused device\n"), out); |
| | 479 | fputs(_(" -c, --set-capacity <loopdev> resize the device\n"), out); |
| | 480 | fputs(_(" -j, --associated <file> list all devices associated with <file>\n"), out); |
| | 481 | fputs(_(" -L, --nooverlap avoid possible conflict between devices\n"), out); |
| | 482 | |
| | 483 | /* commands options */ |
| | 484 | fputs(USAGE_SEPARATOR, out); |
| | 485 | fputs(_(" -o, --offset <num> start at offset <num> into file\n"), out); |
| | 486 | fputs(_(" --sizelimit <num> device is limited to <num> bytes of the file\n"), out); |
| | 487 | fputs(_(" -b, --sector-size <num> set the logical sector size to <num>\n"), out); |
| | 488 | fputs(_(" -P, --partscan create a partitioned loop device\n"), out); |
| | 489 | fputs(_(" -r, --read-only set up a read-only loop device\n"), out); |
| | 490 | fputs(_(" --direct-io[=<on|off>] open backing file with O_DIRECT\n"), out); |
| | 491 | fputs(_(" --loop-ref <string> loop device reference\n"), out); |
| | 492 | fputs(_(" --show print device name after setup (with -f)\n"), out); |
| | 493 | fputs(_(" -v, --verbose verbose mode\n"), out); |
| | 494 | |
| | 495 | /* output options */ |
| | 496 | fputs(USAGE_SEPARATOR, out); |
| | 497 | fputs(_(" -J, --json use JSON --list output format\n"), out); |
| | 498 | fputs(_(" -l, --list list info about all or specified (default)\n"), out); |
| | 499 | fputs(_(" -n, --noheadings don't print headings for --list output\n"), out); |
| | 500 | fputs(_(" -O, --output <cols> specify columns to output for --list\n"), out); |
| | 501 | fputs(_(" --output-all output all columns\n"), out); |
| | 502 | fputs(_(" --raw use raw --list output format\n"), out); |
| | 503 | |
| | 504 | fputs(USAGE_SEPARATOR, out); |
| | 505 | fprintf(out, USAGE_HELP_OPTIONS(31)); |
| | 506 | |
| | 507 | fputs(USAGE_COLUMNS, out); |
| | 508 | for (i = 0; i < ARRAY_SIZE(infos); i++) |
| | 509 | fprintf(out, " %12s %s\n", infos[i].name, _(infos[i].help)); |
| | 510 | |
| | 511 | fprintf(out, USAGE_MAN_TAIL("losetup(8)")); |
| | 512 | |
| | 513 | exit(EXIT_SUCCESS); |
| | 514 | } |
| | 515 | |
| | 516 | static void warn_size(const char *filename, uint64_t size, uint64_t offset, int flags) |
| | 517 | { |
| | 518 | struct stat st; |
| | 519 | |
| | 520 | if (!size) { |
| | 521 | if (stat(filename, &st) || S_ISBLK(st.st_mode)) |
| | 522 | return; |
| | 523 | size = st.st_size; |
| | 524 | |
| | 525 | if (flags & LOOPDEV_FL_OFFSET) |
| | 526 | size -= offset; |
| | 527 | } |
| | 528 | |
| | 529 | if (size < 512) |
| | 530 | warnx(_("%s: Warning: file is smaller than 512 bytes; the loop device " |
| | 531 | "may be useless or invisible for system tools."), |
| | 532 | filename); |
| | 533 | else if (size % 512) |
| | 534 | warnx(_("%s: Warning: file does not end on a 512-byte sector boundary; " |
| | 535 | "the remaining end of the file will be ignored."), |
| | 536 | filename); |
| | 537 | } |
| | 538 | |
| | 539 | static int find_unused(struct loopdev_cxt *lc) |
| | 540 | { |
| | 541 | int rc; |
| | 542 | |
| | 543 | rc = loopcxt_find_unused(lc); |
| | 544 | if (!rc) |
| | 545 | return 0; |
| | 546 | |
| | 547 | if (access(_PATH_DEV_LOOPCTL, F_OK) == 0 && |
| | 548 | access(_PATH_DEV_LOOPCTL, W_OK) != 0) |
| | 549 | ; |
| | 550 | else |
| | 551 | errno = -rc; |
| | 552 | |
| | 553 | warn(_("cannot find an unused loop device")); |
| | 554 | |
| | 555 | return rc; |
| | 556 | } |
| | 557 | |
| | 558 | static int create_loop(struct loopdev_cxt *lc, |
| | 559 | int nooverlap, int lo_flags, int flags, |
| | 560 | const char *file, const char *refname, |
| | 561 | uint64_t offset, uint64_t sizelimit, |
| | 562 | uint64_t blocksize) |
| | 563 | { |
| | 564 | int hasdev = loopcxt_has_device(lc); |
| | 565 | int rc = 0, ntries = 0; |
| | 566 | |
| | 567 | /* losetup --find --noverlap file.img */ |
| | 568 | if (!hasdev && nooverlap) { |
| | 569 | rc = loopcxt_find_overlap(lc, file, offset, sizelimit); |
| | 570 | switch (rc) { |
| | 571 | case 0: /* not found */ |
| | 572 | break; |
| | 573 | |
| | 574 | case 1: /* overlap */ |
| | 575 | loopcxt_deinit(lc); |
| | 576 | errx(EXIT_FAILURE, _("%s: overlapping loop device exists"), file); |
| | 577 | |
| | 578 | case 2: /* overlap -- full size and offset match (reuse) */ |
| | 579 | { |
| | 580 | uint32_t lc_encrypt_type; |
| | 581 | |
| | 582 | /* Once a loop is initialized RO, there is no |
| | 583 | * way to change its parameters. */ |
| | 584 | if (loopcxt_is_readonly(lc) |
| | 585 | && !(lo_flags & LO_FLAGS_READ_ONLY)) { |
| | 586 | loopcxt_deinit(lc); |
| | 587 | errx(EXIT_FAILURE, _("%s: overlapping read-only loop device exists"), file); |
| | 588 | } |
| | 589 | |
| | 590 | /* This is no more supported, but check to be safe. */ |
| | 591 | if (loopcxt_get_encrypt_type(lc, &lc_encrypt_type) == 0 |
| | 592 | && lc_encrypt_type != LO_CRYPT_NONE) { |
| | 593 | loopcxt_deinit(lc); |
| | 594 | errx(EXIT_FAILURE, _("%s: overlapping encrypted loop device exists"), file); |
| | 595 | } |
| | 596 | |
| | 597 | lc->config.info.lo_flags &= ~LO_FLAGS_AUTOCLEAR; |
| | 598 | if (loopcxt_ioctl_status(lc)) { |
| | 599 | loopcxt_deinit(lc); |
| | 600 | errx(EXIT_FAILURE, _("%s: failed to re-use loop device"), file); |
| | 601 | } |
| | 602 | return 0; /* success, re-use */ |
| | 603 | } |
| | 604 | default: /* error */ |
| | 605 | loopcxt_deinit(lc); |
| | 606 | errx(EXIT_FAILURE, _("failed to inspect loop devices")); |
| | 607 | return -errno; |
| | 608 | } |
| | 609 | } |
| | 610 | |
| | 611 | if (hasdev) |
| | 612 | loopcxt_add_device(lc); |
| | 613 | |
| | 614 | /* losetup --noverlap /dev/loopN file.img */ |
| | 615 | if (hasdev && nooverlap) { |
| | 616 | struct loopdev_cxt lc2; |
| | 617 | |
| | 618 | if (loopcxt_init(&lc2, 0)) { |
| | 619 | loopcxt_deinit(lc); |
| | 620 | err(EXIT_FAILURE, _("failed to initialize loopcxt")); |
| | 621 | } |
| | 622 | rc = loopcxt_find_overlap(&lc2, file, offset, sizelimit); |
| | 623 | loopcxt_deinit(&lc2); |
| | 624 | |
| | 625 | if (rc) { |
| | 626 | loopcxt_deinit(lc); |
| | 627 | if (rc > 0) |
| | 628 | errx(EXIT_FAILURE, _("%s: overlapping loop device exists"), file); |
| | 629 | err(EXIT_FAILURE, _("%s: failed to check for conflicting loop devices"), file); |
| | 630 | } |
| | 631 | } |
| | 632 | |
| | 633 | /* Create a new device */ |
| | 634 | do { |
| | 635 | const char *errpre; |
| | 636 | |
| | 637 | /* Note that loopcxt_{find_unused,set_device}() resets |
| | 638 | * loopcxt struct. |
| | 639 | */ |
| | 640 | if (!hasdev && (rc = find_unused(lc))) |
| | 641 | break; |
| | 642 | if (flags & LOOPDEV_FL_OFFSET) |
| | 643 | loopcxt_set_offset(lc, offset); |
| | 644 | if (flags & LOOPDEV_FL_SIZELIMIT) |
| | 645 | loopcxt_set_sizelimit(lc, sizelimit); |
| | 646 | if (lo_flags) |
| | 647 | loopcxt_set_flags(lc, lo_flags); |
| | 648 | if (blocksize > 0) |
| | 649 | loopcxt_set_blocksize(lc, blocksize); |
| | 650 | if (refname && (rc = loopcxt_set_refname(lc, refname))) { |
| | 651 | warnx(_("cannot set loop reference string")); |
| | 652 | break; |
| | 653 | } |
| | 654 | if ((rc = loopcxt_set_backing_file(lc, file))) { |
| | 655 | warn(_("%s: failed to use backing file"), file); |
| | 656 | break; |
| | 657 | } |
| | 658 | errno = 0; |
| | 659 | rc = loopcxt_setup_device(lc); |
| | 660 | if (rc == 0) |
| | 661 | break; /* success */ |
| | 662 | |
| | 663 | if ((errno == EBUSY || errno == EAGAIN) && !hasdev && ntries < 64) { |
| | 664 | xusleep(200000); |
| | 665 | ntries++; |
| | 666 | continue; |
| | 667 | } |
| | 668 | |
| | 669 | /* errors */ |
| | 670 | errpre = hasdev && lc->fd < 0 ? |
| | 671 | loopcxt_get_device(lc) : file; |
| | 672 | warn(_("%s: failed to set up loop device"), errpre); |
| | 673 | break; |
| | 674 | } while (hasdev == 0); |
| | 675 | |
| | 676 | return rc; |
| | 677 | } |
| | 678 | |
| | 679 | int main(int argc, char **argv) |
| | 680 | { |
| | 681 | struct loopdev_cxt lc; |
| | 682 | int act = 0, flags = 0, no_overlap = 0, c; |
| | 683 | char *file = NULL, *refname = NULL; |
| | 684 | uint64_t offset = 0, sizelimit = 0, blocksize = 0; |
| | 685 | int res = 0, showdev = 0, lo_flags = 0; |
| | 686 | char *outarg = NULL; |
| | 687 | int list = 0; |
| | 688 | unsigned long use_dio = 0, set_dio = 0, set_blocksize = 0; |
| | 689 | |
| | 690 | enum { |
| | 691 | OPT_SIZELIMIT = CHAR_MAX + 1, |
| | 692 | OPT_SHOW, |
| | 693 | OPT_RAW, |
| | 694 | OPT_REF, |
| | 695 | OPT_DIO, |
| | 696 | OPT_OUTPUT_ALL |
| | 697 | }; |
| | 698 | static const struct option longopts[] = { |
| | 699 | { "all", no_argument, NULL, 'a' }, |
| | 700 | { "set-capacity", required_argument, NULL, 'c' }, |
| | 701 | { "detach", required_argument, NULL, 'd' }, |
| | 702 | { "detach-all", no_argument, NULL, 'D' }, |
| | 703 | { "find", no_argument, NULL, 'f' }, |
| | 704 | { "nooverlap", no_argument, NULL, 'L' }, |
| | 705 | { "help", no_argument, NULL, 'h' }, |
| | 706 | { "associated", required_argument, NULL, 'j' }, |
| | 707 | { "json", no_argument, NULL, 'J' }, |
| | 708 | { "list", no_argument, NULL, 'l' }, |
| | 709 | { "sector-size", required_argument, NULL, 'b' }, |
| | 710 | { "noheadings", no_argument, NULL, 'n' }, |
| | 711 | { "offset", required_argument, NULL, 'o' }, |
| | 712 | { "output", required_argument, NULL, 'O' }, |
| | 713 | { "output-all", no_argument, NULL, OPT_OUTPUT_ALL }, |
| | 714 | { "sizelimit", required_argument, NULL, OPT_SIZELIMIT }, |
| | 715 | { "partscan", no_argument, NULL, 'P' }, |
| | 716 | { "read-only", no_argument, NULL, 'r' }, |
| | 717 | { "direct-io", optional_argument, NULL, OPT_DIO }, |
| | 718 | { "raw", no_argument, NULL, OPT_RAW }, |
| | 719 | { "loop-ref", required_argument, NULL, OPT_REF, }, |
| | 720 | { "show", no_argument, NULL, OPT_SHOW }, |
| | 721 | { "verbose", no_argument, NULL, 'v' }, |
| | 722 | { "version", no_argument, NULL, 'V' }, |
| | 723 | { NULL, 0, NULL, 0 } |
| | 724 | }; |
| | 725 | |
| | 726 | static const ul_excl_t excl[] = { /* rows and cols in ASCII order */ |
| | 727 | { 'D','a','c','d','f','j' }, |
| | 728 | { 'D','c','d','f','l' }, |
| | 729 | { 'D','c','d','f','O' }, |
| | 730 | { 'J',OPT_RAW }, |
| | 731 | { 0 } |
| | 732 | }; |
| | 733 | int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT; |
| | 734 | |
| | 735 | setlocale(LC_ALL, ""); |
| | 736 | bindtextdomain(PACKAGE, LOCALEDIR); |
| | 737 | textdomain(PACKAGE); |
| | 738 | close_stdout_atexit(); |
| | 739 | |
| | 740 | if (loopcxt_init(&lc, 0)) |
| | 741 | err(EXIT_FAILURE, _("failed to initialize loopcxt")); |
| | 742 | |
| | 743 | while ((c = getopt_long(argc, argv, "ab:c:d:Dfhj:JlLno:O:PrvV", |
| | 744 | longopts, NULL)) != -1) { |
| | 745 | |
| | 746 | err_exclusive_options(c, longopts, excl, excl_st); |
| | 747 | |
| | 748 | switch (c) { |
| | 749 | case 'a': |
| | 750 | act = A_SHOW; |
| | 751 | break; |
| | 752 | case 'b': |
| | 753 | set_blocksize = 1; |
| | 754 | blocksize = strtosize_or_err(optarg, _("failed to parse logical block size")); |
| | 755 | break; |
| | 756 | case 'c': |
| | 757 | act = A_SET_CAPACITY; |
| | 758 | if (loopcxt_set_device(&lc, optarg)) |
| | 759 | err(EXIT_FAILURE, _("%s: failed to use device"), |
| | 760 | optarg); |
| | 761 | break; |
| | 762 | case 'r': |
| | 763 | lo_flags |= LO_FLAGS_READ_ONLY; |
| | 764 | break; |
| | 765 | case OPT_REF: |
| | 766 | refname = optarg; |
| | 767 | break; |
| | 768 | case 'd': |
| | 769 | act = A_DELETE; |
| | 770 | if (loopcxt_set_device(&lc, optarg)) |
| | 771 | err(EXIT_FAILURE, _("%s: failed to use device"), |
| | 772 | optarg); |
| | 773 | break; |
| | 774 | case 'D': |
| | 775 | act = A_DELETE_ALL; |
| | 776 | break; |
| | 777 | case 'f': |
| | 778 | act = A_FIND_FREE; |
| | 779 | break; |
| | 780 | case 'J': |
| | 781 | json = 1; |
| | 782 | break; |
| | 783 | case 'j': |
| | 784 | act = A_SHOW; |
| | 785 | file = optarg; |
| | 786 | break; |
| | 787 | case 'l': |
| | 788 | list = 1; |
| | 789 | break; |
| | 790 | case 'L': |
| | 791 | no_overlap = 1; |
| | 792 | break; |
| | 793 | case 'n': |
| | 794 | no_headings = 1; |
| | 795 | break; |
| | 796 | case OPT_RAW: |
| | 797 | raw = 1; |
| | 798 | break; |
| | 799 | case 'o': |
| | 800 | offset = strtosize_or_err(optarg, _("failed to parse offset")); |
| | 801 | flags |= LOOPDEV_FL_OFFSET; |
| | 802 | break; |
| | 803 | case 'O': |
| | 804 | outarg = optarg; |
| | 805 | list = 1; |
| | 806 | break; |
| | 807 | case OPT_OUTPUT_ALL: |
| | 808 | list = 1; |
| | 809 | for (ncolumns = 0; ncolumns < ARRAY_SIZE(infos); ncolumns++) |
| | 810 | columns[ncolumns] = ncolumns; |
| | 811 | break; |
| | 812 | case 'P': |
| | 813 | lo_flags |= LO_FLAGS_PARTSCAN; |
| | 814 | break; |
| | 815 | case OPT_SHOW: |
| | 816 | showdev = 1; |
| | 817 | break; |
| | 818 | case OPT_DIO: |
| | 819 | use_dio = set_dio = 1; |
| | 820 | if (optarg) |
| | 821 | use_dio = ul_parse_switch(optarg, "on", "off", NULL); |
| | 822 | if (use_dio) |
| | 823 | lo_flags |= LO_FLAGS_DIRECT_IO; |
| | 824 | break; |
| | 825 | case 'v': |
| | 826 | break; |
| | 827 | case OPT_SIZELIMIT: /* --sizelimit */ |
| | 828 | sizelimit = strtosize_or_err(optarg, _("failed to parse size")); |
| | 829 | flags |= LOOPDEV_FL_SIZELIMIT; |
| | 830 | break; |
| | 831 | |
| | 832 | case 'h': |
| | 833 | usage(); |
| | 834 | case 'V': |
| | 835 | print_version(EXIT_SUCCESS); |
| | 836 | default: |
| | 837 | errtryhelp(EXIT_FAILURE); |
| | 838 | } |
| | 839 | } |
| | 840 | |
| | 841 | ul_path_init_debug(); |
| | 842 | ul_sysfs_init_debug(); |
| | 843 | |
| | 844 | /* default is --list --all */ |
| | 845 | if (argc == 1) { |
| | 846 | act = A_SHOW; |
| | 847 | list = 1; |
| | 848 | } |
| | 849 | |
| | 850 | if (!act && argc == 2 && (raw || json)) { |
| | 851 | act = A_SHOW; |
| | 852 | list = 1; |
| | 853 | } |
| | 854 | |
| | 855 | /* default --list output columns */ |
| | 856 | if (list && !ncolumns) { |
| | 857 | columns[ncolumns++] = COL_NAME; |
| | 858 | columns[ncolumns++] = COL_SIZELIMIT; |
| | 859 | columns[ncolumns++] = COL_OFFSET; |
| | 860 | columns[ncolumns++] = COL_AUTOCLR; |
| | 861 | columns[ncolumns++] = COL_RO; |
| | 862 | columns[ncolumns++] = COL_BACK_FILE; |
| | 863 | columns[ncolumns++] = COL_DIO; |
| | 864 | columns[ncolumns++] = COL_LOGSEC; |
| | 865 | } |
| | 866 | |
| | 867 | if (act == A_FIND_FREE && optind < argc) { |
| | 868 | /* |
| | 869 | * losetup -f <backing_file> |
| | 870 | */ |
| | 871 | act = A_CREATE; |
| | 872 | file = argv[optind++]; |
| | 873 | |
| | 874 | if (optind < argc) |
| | 875 | errx(EXIT_FAILURE, _("unexpected arguments")); |
| | 876 | } |
| | 877 | |
| | 878 | if (list && !act && optind == argc) |
| | 879 | /* |
| | 880 | * losetup --list defaults to --all |
| | 881 | */ |
| | 882 | act = A_SHOW; |
| | 883 | |
| | 884 | if (!act && optind + 1 == argc) { |
| | 885 | /* |
| | 886 | * losetup [--list] <device> |
| | 887 | * OR |
| | 888 | * losetup {--direct-io[=off]|--logical-blocksize=size}... <device> |
| | 889 | */ |
| | 890 | if (set_dio) { |
| | 891 | act = A_SET_DIRECT_IO; |
| | 892 | lo_flags &= ~LO_FLAGS_DIRECT_IO; |
| | 893 | } else if (set_blocksize) |
| | 894 | act = A_SET_BLOCKSIZE; |
| | 895 | else |
| | 896 | act = A_SHOW_ONE; |
| | 897 | |
| | 898 | if (loopcxt_set_device(&lc, argv[optind])) |
| | 899 | err(EXIT_FAILURE, _("%s: failed to use device"), |
| | 900 | argv[optind]); |
| | 901 | optind++; |
| | 902 | } |
| | 903 | if (!act) { |
| | 904 | /* |
| | 905 | * losetup <loopdev> <backing_file> |
| | 906 | */ |
| | 907 | act = A_CREATE; |
| | 908 | |
| | 909 | if (optind >= argc) |
| | 910 | errx(EXIT_FAILURE, _("no loop device specified")); |
| | 911 | /* don't use is_loopdev() here, the device does not have exist yet */ |
| | 912 | if (loopcxt_set_device(&lc, argv[optind])) |
| | 913 | err(EXIT_FAILURE, _("%s: failed to use device"), |
| | 914 | argv[optind]); |
| | 915 | optind++; |
| | 916 | |
| | 917 | if (optind >= argc) |
| | 918 | errx(EXIT_FAILURE, _("no file specified")); |
| | 919 | file = argv[optind++]; |
| | 920 | } |
| | 921 | |
| | 922 | if (act != A_CREATE && |
| | 923 | (sizelimit || lo_flags || showdev)) |
| | 924 | errx(EXIT_FAILURE, |
| | 925 | _("the options %s are allowed during loop device setup only"), |
| | 926 | "--{sizelimit,partscan,read-only,show}"); |
| | 927 | |
| | 928 | if ((flags & LOOPDEV_FL_OFFSET) && |
| | 929 | act != A_CREATE && (act != A_SHOW || !file)) |
| | 930 | errx(EXIT_FAILURE, _("the option --offset is not allowed in this context")); |
| | 931 | |
| | 932 | if (outarg && string_add_to_idarray(outarg, columns, ARRAY_SIZE(columns), |
| | 933 | &ncolumns, column_name_to_id) < 0) |
| | 934 | return EXIT_FAILURE; |
| | 935 | |
| | 936 | switch (act) { |
| | 937 | case A_CREATE: |
| | 938 | res = create_loop(&lc, no_overlap, lo_flags, flags, file, refname, |
| | 939 | offset, sizelimit, blocksize); |
| | 940 | if (res == 0) { |
| | 941 | if (showdev) |
| | 942 | printf("%s\n", loopcxt_get_device(&lc)); |
| | 943 | warn_size(file, sizelimit, offset, flags); |
| | 944 | } |
| | 945 | break; |
| | 946 | case A_DELETE: |
| | 947 | res = delete_loop(&lc); |
| | 948 | while (optind < argc) { |
| | 949 | if (loopcxt_set_device(&lc, argv[optind])) |
| | 950 | warn(_("%s: failed to use device"), |
| | 951 | argv[optind]); |
| | 952 | optind++; |
| | 953 | res += delete_loop(&lc); |
| | 954 | } |
| | 955 | break; |
| | 956 | case A_DELETE_ALL: |
| | 957 | res = delete_all_loops(&lc); |
| | 958 | break; |
| | 959 | case A_FIND_FREE: |
| | 960 | res = find_unused(&lc); |
| | 961 | if (!res) |
| | 962 | printf("%s%s\n", loopcxt_get_device(&lc), |
| | 963 | loopcxt_is_lost(&lc) ? " (lost)" : ""); |
| | 964 | break; |
| | 965 | case A_SHOW: |
| | 966 | if (list) |
| | 967 | res = show_table(&lc, file, offset, flags); |
| | 968 | else |
| | 969 | res = show_all_loops(&lc, file, offset, flags); |
| | 970 | break; |
| | 971 | case A_SHOW_ONE: |
| | 972 | if (list) |
| | 973 | res = show_table(&lc, NULL, 0, 0); |
| | 974 | else |
| | 975 | res = printf_loopdev(&lc); |
| | 976 | if (res) |
| | 977 | warn("%s", loopcxt_get_device(&lc)); |
| | 978 | break; |
| | 979 | case A_SET_CAPACITY: |
| | 980 | res = loopcxt_ioctl_capacity(&lc); |
| | 981 | if (res) |
| | 982 | warn(_("%s: set capacity failed"), |
| | 983 | loopcxt_get_device(&lc)); |
| | 984 | break; |
| | 985 | case A_SET_DIRECT_IO: |
| | 986 | res = loopcxt_ioctl_dio(&lc, use_dio); |
| | 987 | if (res) |
| | 988 | warn(_("%s: set direct io failed"), |
| | 989 | loopcxt_get_device(&lc)); |
| | 990 | break; |
| | 991 | case A_SET_BLOCKSIZE: |
| | 992 | res = loopcxt_ioctl_blocksize(&lc, blocksize); |
| | 993 | if (res) |
| | 994 | warn(_("%s: set logical block size failed"), |
| | 995 | loopcxt_get_device(&lc)); |
| | 996 | break; |
| | 997 | default: |
| | 998 | warnx(_("bad usage")); |
| | 999 | errtryhelp(EXIT_FAILURE); |
| | 1000 | break; |
| | 1001 | } |
| | 1002 | |
| | 1003 | if (res && (act == A_SET_CAPACITY |
| | 1004 | || act == A_CREATE |
| | 1005 | || act == A_SET_DIRECT_IO |
| | 1006 | || act == A_SET_BLOCKSIZE) |
| | 1007 | && loopcxt_is_lost(&lc)) |
| | 1008 | warn_lost(&lc); |
| | 1009 | |
| | 1010 | loopcxt_deinit(&lc); |
| | 1011 | return res ? EXIT_FAILURE : EXIT_SUCCESS; |
| | 1012 | } |
projects / thirdparty / util-linux.git / blame_incremental