2 * QEMU disk image utility
4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 #include "qapi-visit.h"
25 #include "qapi/qmp-output-visitor.h"
26 #include "qapi/qmp/qjson.h"
27 #include "qemu-common.h"
28 #include "qemu/option.h"
29 #include "qemu/error-report.h"
30 #include "qemu/osdep.h"
31 #include "sysemu/sysemu.h"
32 #include "sysemu/block-backend.h"
33 #include "block/block_int.h"
34 #include "block/blockjob.h"
35 #include "block/qapi.h"
38 #define QEMU_IMG_VERSION "qemu-img version " QEMU_VERSION QEMU_PKGVERSION \
39 ", Copyright (c) 2004-2008 Fabrice Bellard\n"
41 typedef struct img_cmd_t {
43 int (*handler)(int argc, char **argv);
48 OPTION_BACKING_CHAIN = 257,
51 typedef enum OutputFormat {
56 /* Default to cache=writeback as data integrity is not important for qemu-tcg. */
57 #define BDRV_O_FLAGS BDRV_O_CACHE_WB
58 #define BDRV_DEFAULT_CACHE "writeback"
60 static void format_print(void *opaque, const char *name)
65 static void QEMU_NORETURN GCC_FMT_ATTR(1, 2) error_exit(const char *fmt, ...)
69 error_printf("qemu-img: ");
72 error_vprintf(fmt, ap);
75 error_printf("\nTry 'qemu-img --help' for more information\n");
79 /* Please keep in synch with qemu-img.texi */
80 static void QEMU_NORETURN help(void)
82 const char *help_msg =
84 "usage: qemu-img command [command options]\n"
85 "QEMU disk image utility\n"
88 #define DEF(option, callback, arg_string) \
90 #include "qemu-img-cmds.h"
94 "Command parameters:\n"
95 " 'filename' is a disk image filename\n"
96 " 'fmt' is the disk image format. It is guessed automatically in most cases\n"
97 " 'cache' is the cache mode used to write the output disk image, the valid\n"
98 " options are: 'none', 'writeback' (default, except for convert), 'writethrough',\n"
99 " 'directsync' and 'unsafe' (default for convert)\n"
100 " 'src_cache' is the cache mode used to read input disk images, the valid\n"
101 " options are the same as for the 'cache' option\n"
102 " 'size' is the disk image size in bytes. Optional suffixes\n"
103 " 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M),\n"
104 " 'T' (terabyte, 1024G), 'P' (petabyte, 1024T) and 'E' (exabyte, 1024P) are\n"
105 " supported. 'b' is ignored.\n"
106 " 'output_filename' is the destination disk image filename\n"
107 " 'output_fmt' is the destination format\n"
108 " 'options' is a comma separated list of format specific options in a\n"
109 " name=value format. Use -o ? for an overview of the options supported by the\n"
111 " 'snapshot_param' is param used for internal snapshot, format\n"
112 " is 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
114 " 'snapshot_id_or_name' is deprecated, use 'snapshot_param'\n"
116 " '-c' indicates that target image must be compressed (qcow format only)\n"
117 " '-u' enables unsafe rebasing. It is assumed that old and new backing file\n"
118 " match exactly. The image doesn't need a working backing file before\n"
119 " rebasing in this case (useful for renaming the backing file)\n"
120 " '-h' with or without a command shows this help and lists the supported formats\n"
121 " '-p' show progress of command (only certain commands)\n"
122 " '-q' use Quiet mode - do not print any output (except errors)\n"
123 " '-S' indicates the consecutive number of bytes (defaults to 4k) that must\n"
124 " contain only zeros for qemu-img to create a sparse image during\n"
125 " conversion. If the number of bytes is 0, the source will not be scanned for\n"
126 " unallocated or zero sectors, and the destination image will always be\n"
128 " '--output' takes the format in which the output must be done (human or json)\n"
129 " '-n' skips the target volume creation (useful if the volume is created\n"
130 " prior to running qemu-img)\n"
132 "Parameters to check subcommand:\n"
133 " '-r' tries to repair any inconsistencies that are found during the check.\n"
134 " '-r leaks' repairs only cluster leaks, whereas '-r all' fixes all\n"
135 " kinds of errors, with a higher risk of choosing the wrong fix or\n"
136 " hiding corruption that has already occurred.\n"
138 "Parameters to snapshot subcommand:\n"
139 " 'snapshot' is the name of the snapshot to create, apply or delete\n"
140 " '-a' applies a snapshot (revert disk to saved state)\n"
141 " '-c' creates a snapshot\n"
142 " '-d' deletes a snapshot\n"
143 " '-l' lists all snapshots in the given image\n"
145 "Parameters to compare subcommand:\n"
146 " '-f' first image format\n"
147 " '-F' second image format\n"
148 " '-s' run in Strict mode - fail on different image size or sector allocation\n";
150 printf("%s\nSupported formats:", help_msg);
151 bdrv_iterate_format(format_print, NULL);
156 static int GCC_FMT_ATTR(2, 3) qprintf(bool quiet, const char *fmt, ...)
162 ret = vprintf(fmt, args);
169 static int print_block_option_help(const char *filename, const char *fmt)
171 BlockDriver *drv, *proto_drv;
172 QemuOptsList *create_opts = NULL;
173 Error *local_err = NULL;
175 /* Find driver and parse its options */
176 drv = bdrv_find_format(fmt);
178 error_report("Unknown file format '%s'", fmt);
182 create_opts = qemu_opts_append(create_opts, drv->create_opts);
184 proto_drv = bdrv_find_protocol(filename, true, &local_err);
186 error_report_err(local_err);
187 qemu_opts_free(create_opts);
190 create_opts = qemu_opts_append(create_opts, proto_drv->create_opts);
193 qemu_opts_print_help(create_opts);
194 qemu_opts_free(create_opts);
198 static BlockBackend *img_open(const char *id, const char *filename,
199 const char *fmt, int flags,
200 bool require_io, bool quiet)
203 BlockDriverState *bs;
205 Error *local_err = NULL;
206 QDict *options = NULL;
209 options = qdict_new();
210 qdict_put(options, "driver", qstring_from_str(fmt));
213 blk = blk_new_open(id, filename, NULL, options, flags, &local_err);
215 error_report("Could not open '%s': %s", filename,
216 error_get_pretty(local_err));
217 error_free(local_err);
222 if (bdrv_is_encrypted(bs) && require_io) {
223 qprintf(quiet, "Disk image '%s' is encrypted.\n", filename);
224 if (qemu_read_password(password, sizeof(password)) < 0) {
225 error_report("No password given");
228 if (bdrv_set_key(bs, password) < 0) {
229 error_report("invalid password");
239 static int add_old_style_options(const char *fmt, QemuOpts *opts,
240 const char *base_filename,
241 const char *base_fmt)
246 qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, &err);
248 error_report("Backing file not supported for file format '%s'",
255 qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &err);
257 error_report("Backing file format not supported for file "
266 static int img_create(int argc, char **argv)
269 uint64_t img_size = -1;
270 const char *fmt = "raw";
271 const char *base_fmt = NULL;
272 const char *filename;
273 const char *base_filename = NULL;
274 char *options = NULL;
275 Error *local_err = NULL;
279 c = getopt(argc, argv, "F:b:f:he6o:q");
292 base_filename = optarg;
298 error_report("option -e is deprecated, please use \'-o "
299 "encryption\' instead!");
302 error_report("option -6 is deprecated, please use \'-o "
303 "compat6\' instead!");
306 if (!is_valid_option_list(optarg)) {
307 error_report("Invalid option list: %s", optarg);
311 options = g_strdup(optarg);
313 char *old_options = options;
314 options = g_strdup_printf("%s,%s", options, optarg);
324 /* Get the filename */
325 filename = (optind < argc) ? argv[optind] : NULL;
326 if (options && has_help_option(options)) {
328 return print_block_option_help(filename, fmt);
331 if (optind >= argc) {
332 error_exit("Expecting image file name");
336 /* Get image size, if specified */
340 sval = strtosz_suffix(argv[optind++], &end, STRTOSZ_DEFSUFFIX_B);
341 if (sval < 0 || *end) {
342 if (sval == -ERANGE) {
343 error_report("Image size must be less than 8 EiB!");
345 error_report("Invalid image size specified! You may use k, M, "
346 "G, T, P or E suffixes for ");
347 error_report("kilobytes, megabytes, gigabytes, terabytes, "
348 "petabytes and exabytes.");
352 img_size = (uint64_t)sval;
354 if (optind != argc) {
355 error_exit("Unexpected argument: %s", argv[optind]);
358 bdrv_img_create(filename, fmt, base_filename, base_fmt,
359 options, img_size, BDRV_O_FLAGS, &local_err, quiet);
361 error_report("%s: %s", filename, error_get_pretty(local_err));
362 error_free(local_err);
374 static void dump_json_image_check(ImageCheck *check, bool quiet)
376 Error *local_err = NULL;
378 QmpOutputVisitor *ov = qmp_output_visitor_new();
380 visit_type_ImageCheck(qmp_output_get_visitor(ov),
381 &check, NULL, &local_err);
382 obj = qmp_output_get_qobject(ov);
383 str = qobject_to_json_pretty(obj);
385 qprintf(quiet, "%s\n", qstring_get_str(str));
387 qmp_output_visitor_cleanup(ov);
391 static void dump_human_image_check(ImageCheck *check, bool quiet)
393 if (!(check->corruptions || check->leaks || check->check_errors)) {
394 qprintf(quiet, "No errors were found on the image.\n");
396 if (check->corruptions) {
397 qprintf(quiet, "\n%" PRId64 " errors were found on the image.\n"
398 "Data may be corrupted, or further writes to the image "
405 "\n%" PRId64 " leaked clusters were found on the image.\n"
406 "This means waste of disk space, but no harm to data.\n",
410 if (check->check_errors) {
413 " internal errors have occurred during the check.\n",
414 check->check_errors);
418 if (check->total_clusters != 0 && check->allocated_clusters != 0) {
419 qprintf(quiet, "%" PRId64 "/%" PRId64 " = %0.2f%% allocated, "
420 "%0.2f%% fragmented, %0.2f%% compressed clusters\n",
421 check->allocated_clusters, check->total_clusters,
422 check->allocated_clusters * 100.0 / check->total_clusters,
423 check->fragmented_clusters * 100.0 / check->allocated_clusters,
424 check->compressed_clusters * 100.0 /
425 check->allocated_clusters);
428 if (check->image_end_offset) {
430 "Image end offset: %" PRId64 "\n", check->image_end_offset);
434 static int collect_image_check(BlockDriverState *bs,
436 const char *filename,
441 BdrvCheckResult result;
443 ret = bdrv_check(bs, &result, fix);
448 check->filename = g_strdup(filename);
449 check->format = g_strdup(bdrv_get_format_name(bs));
450 check->check_errors = result.check_errors;
451 check->corruptions = result.corruptions;
452 check->has_corruptions = result.corruptions != 0;
453 check->leaks = result.leaks;
454 check->has_leaks = result.leaks != 0;
455 check->corruptions_fixed = result.corruptions_fixed;
456 check->has_corruptions_fixed = result.corruptions != 0;
457 check->leaks_fixed = result.leaks_fixed;
458 check->has_leaks_fixed = result.leaks != 0;
459 check->image_end_offset = result.image_end_offset;
460 check->has_image_end_offset = result.image_end_offset != 0;
461 check->total_clusters = result.bfi.total_clusters;
462 check->has_total_clusters = result.bfi.total_clusters != 0;
463 check->allocated_clusters = result.bfi.allocated_clusters;
464 check->has_allocated_clusters = result.bfi.allocated_clusters != 0;
465 check->fragmented_clusters = result.bfi.fragmented_clusters;
466 check->has_fragmented_clusters = result.bfi.fragmented_clusters != 0;
467 check->compressed_clusters = result.bfi.compressed_clusters;
468 check->has_compressed_clusters = result.bfi.compressed_clusters != 0;
474 * Checks an image for consistency. Exit codes:
476 * 0 - Check completed, image is good
477 * 1 - Check not completed because of internal errors
478 * 2 - Check completed, image is corrupted
479 * 3 - Check completed, image has leaked clusters, but is good otherwise
480 * 63 - Checks are not supported by the image format
482 static int img_check(int argc, char **argv)
485 OutputFormat output_format = OFORMAT_HUMAN;
486 const char *filename, *fmt, *output, *cache;
488 BlockDriverState *bs;
490 int flags = BDRV_O_FLAGS | BDRV_O_CHECK;
496 cache = BDRV_DEFAULT_CACHE;
498 int option_index = 0;
499 static const struct option long_options[] = {
500 {"help", no_argument, 0, 'h'},
501 {"format", required_argument, 0, 'f'},
502 {"repair", required_argument, 0, 'r'},
503 {"output", required_argument, 0, OPTION_OUTPUT},
506 c = getopt_long(argc, argv, "hf:r:T:q",
507 long_options, &option_index);
520 flags |= BDRV_O_RDWR;
522 if (!strcmp(optarg, "leaks")) {
523 fix = BDRV_FIX_LEAKS;
524 } else if (!strcmp(optarg, "all")) {
525 fix = BDRV_FIX_LEAKS | BDRV_FIX_ERRORS;
527 error_exit("Unknown option value for -r "
528 "(expecting 'leaks' or 'all'): %s", optarg);
542 if (optind != argc - 1) {
543 error_exit("Expecting one image file name");
545 filename = argv[optind++];
547 if (output && !strcmp(output, "json")) {
548 output_format = OFORMAT_JSON;
549 } else if (output && !strcmp(output, "human")) {
550 output_format = OFORMAT_HUMAN;
552 error_report("--output must be used with human or json as argument.");
556 ret = bdrv_parse_cache_flags(cache, &flags);
558 error_report("Invalid source cache option: %s", cache);
562 blk = img_open("image", filename, fmt, flags, true, quiet);
568 check = g_new0(ImageCheck, 1);
569 ret = collect_image_check(bs, check, filename, fmt, fix);
571 if (ret == -ENOTSUP) {
572 error_report("This image format does not support checks");
577 if (check->corruptions_fixed || check->leaks_fixed) {
578 int corruptions_fixed, leaks_fixed;
580 leaks_fixed = check->leaks_fixed;
581 corruptions_fixed = check->corruptions_fixed;
583 if (output_format == OFORMAT_HUMAN) {
585 "The following inconsistencies were found and repaired:\n\n"
586 " %" PRId64 " leaked clusters\n"
587 " %" PRId64 " corruptions\n\n"
588 "Double checking the fixed image now...\n",
590 check->corruptions_fixed);
593 ret = collect_image_check(bs, check, filename, fmt, 0);
595 check->leaks_fixed = leaks_fixed;
596 check->corruptions_fixed = corruptions_fixed;
600 switch (output_format) {
602 dump_human_image_check(check, quiet);
605 dump_json_image_check(check, quiet);
610 if (ret || check->check_errors) {
612 error_report("Check failed: %s", strerror(-ret));
614 error_report("Check failed");
620 if (check->corruptions) {
622 } else if (check->leaks) {
629 qapi_free_ImageCheck(check);
634 typedef struct CommonBlockJobCBInfo {
635 BlockDriverState *bs;
637 } CommonBlockJobCBInfo;
639 static void common_block_job_cb(void *opaque, int ret)
641 CommonBlockJobCBInfo *cbi = opaque;
644 error_setg_errno(cbi->errp, -ret, "Block job failed");
647 /* Drop this block job's reference */
651 static void run_block_job(BlockJob *job, Error **errp)
653 AioContext *aio_context = bdrv_get_aio_context(job->bs);
656 aio_poll(aio_context, true);
657 qemu_progress_print((float)job->offset / job->len * 100.f, 0);
658 } while (!job->ready);
660 block_job_complete_sync(job, errp);
662 /* A block job may finish instantaneously without publishing any progress,
663 * so just signal completion here */
664 qemu_progress_print(100.f, 0);
667 static int img_commit(int argc, char **argv)
670 const char *filename, *fmt, *cache, *base;
672 BlockDriverState *bs, *base_bs;
673 bool progress = false, quiet = false, drop = false;
674 Error *local_err = NULL;
675 CommonBlockJobCBInfo cbi;
678 cache = BDRV_DEFAULT_CACHE;
681 c = getopt(argc, argv, "f:ht:b:dpq");
713 /* Progress is not shown in Quiet mode */
718 if (optind != argc - 1) {
719 error_exit("Expecting one image file name");
721 filename = argv[optind++];
723 flags = BDRV_O_RDWR | BDRV_O_UNMAP;
724 ret = bdrv_parse_cache_flags(cache, &flags);
726 error_report("Invalid cache option: %s", cache);
730 blk = img_open("image", filename, fmt, flags, true, quiet);
736 qemu_progress_init(progress, 1.f);
737 qemu_progress_print(0.f, 100);
740 base_bs = bdrv_find_backing_image(bs, base);
742 error_set(&local_err, QERR_BASE_NOT_FOUND, base);
746 /* This is different from QMP, which by default uses the deepest file in
747 * the backing chain (i.e., the very base); however, the traditional
748 * behavior of qemu-img commit is using the immediate backing file. */
749 base_bs = bs->backing_hd;
751 error_setg(&local_err, "Image does not have a backing file");
756 cbi = (CommonBlockJobCBInfo){
761 commit_active_start(bs, base_bs, 0, BLOCKDEV_ON_ERROR_REPORT,
762 common_block_job_cb, &cbi, &local_err);
767 /* The block job will swap base_bs and bs (which is not what we really want
768 * here, but okay) and unref base_bs (after the swap, i.e., the old top
769 * image). In order to still be able to empty that top image afterwards,
770 * increment the reference counter here preemptively. */
775 run_block_job(bs->job, &local_err);
780 if (!drop && base_bs->drv->bdrv_make_empty) {
781 ret = base_bs->drv->bdrv_make_empty(base_bs);
783 error_setg_errno(&local_err, -ret, "Could not empty %s",
800 error_report_err(local_err);
804 qprintf(quiet, "Image committed.\n");
809 * Returns true iff the first sector pointed to by 'buf' contains at least
812 * 'pnum' is set to the number of sectors (including and immediately following
813 * the first one) that are known to be in the same allocated/unallocated state.
815 static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum)
824 is_zero = buffer_is_zero(buf, 512);
825 for(i = 1; i < n; i++) {
827 if (is_zero != buffer_is_zero(buf, 512)) {
836 * Like is_allocated_sectors, but if the buffer starts with a used sector,
837 * up to 'min' consecutive sectors containing zeros are ignored. This avoids
838 * breaking up write requests for only small sparse areas.
840 static int is_allocated_sectors_min(const uint8_t *buf, int n, int *pnum,
844 int num_checked, num_used;
850 ret = is_allocated_sectors(buf, n, pnum);
856 buf += BDRV_SECTOR_SIZE * *pnum;
858 num_checked = num_used;
861 ret = is_allocated_sectors(buf, n, pnum);
863 buf += BDRV_SECTOR_SIZE * *pnum;
865 num_checked += *pnum;
867 num_used = num_checked;
868 } else if (*pnum >= min) {
878 * Compares two buffers sector by sector. Returns 0 if the first sector of both
879 * buffers matches, non-zero otherwise.
881 * pnum is set to the number of sectors (including and immediately following
882 * the first one) that are known to have the same comparison result
884 static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n,
895 res = !!memcmp(buf1, buf2, 512);
896 for(i = 1; i < n; i++) {
900 if (!!memcmp(buf1, buf2, 512) != res) {
909 #define IO_BUF_SIZE (2 * 1024 * 1024)
911 static int64_t sectors_to_bytes(int64_t sectors)
913 return sectors << BDRV_SECTOR_BITS;
916 static int64_t sectors_to_process(int64_t total, int64_t from)
918 return MIN(total - from, IO_BUF_SIZE >> BDRV_SECTOR_BITS);
922 * Check if passed sectors are empty (not allocated or contain only 0 bytes)
924 * Returns 0 in case sectors are filled with 0, 1 if sectors contain non-zero
925 * data and negative value on error.
927 * @param blk: BlockBackend for the image
928 * @param sect_num: Number of first sector to check
929 * @param sect_count: Number of sectors to check
930 * @param filename: Name of disk file we are checking (logging purpose)
931 * @param buffer: Allocated buffer for storing read data
932 * @param quiet: Flag for quiet mode
934 static int check_empty_sectors(BlockBackend *blk, int64_t sect_num,
935 int sect_count, const char *filename,
936 uint8_t *buffer, bool quiet)
939 ret = blk_read(blk, sect_num, buffer, sect_count);
941 error_report("Error while reading offset %" PRId64 " of %s: %s",
942 sectors_to_bytes(sect_num), filename, strerror(-ret));
945 ret = is_allocated_sectors(buffer, sect_count, &pnum);
946 if (ret || pnum != sect_count) {
947 qprintf(quiet, "Content mismatch at offset %" PRId64 "!\n",
948 sectors_to_bytes(ret ? sect_num : sect_num + pnum));
956 * Compares two images. Exit codes:
958 * 0 - Images are identical
960 * >1 - Error occurred
962 static int img_compare(int argc, char **argv)
964 const char *fmt1 = NULL, *fmt2 = NULL, *cache, *filename1, *filename2;
965 BlockBackend *blk1, *blk2;
966 BlockDriverState *bs1, *bs2;
967 int64_t total_sectors1, total_sectors2;
968 uint8_t *buf1 = NULL, *buf2 = NULL;
970 int allocated1, allocated2;
971 int ret = 0; /* return value - 0 Ident, 1 Different, >1 Error */
972 bool progress = false, quiet = false, strict = false;
974 int64_t total_sectors;
975 int64_t sector_num = 0;
978 uint64_t progress_base;
980 cache = BDRV_DEFAULT_CACHE;
982 c = getopt(argc, argv, "hf:F:T:pqs");
1012 /* Progress is not shown in Quiet mode */
1018 if (optind != argc - 2) {
1019 error_exit("Expecting two image file names");
1021 filename1 = argv[optind++];
1022 filename2 = argv[optind++];
1024 /* Initialize before goto out */
1025 qemu_progress_init(progress, 2.0);
1027 flags = BDRV_O_FLAGS;
1028 ret = bdrv_parse_cache_flags(cache, &flags);
1030 error_report("Invalid source cache option: %s", cache);
1035 blk1 = img_open("image_1", filename1, fmt1, flags, true, quiet);
1042 blk2 = img_open("image_2", filename2, fmt2, flags, true, quiet);
1049 buf1 = blk_blockalign(blk1, IO_BUF_SIZE);
1050 buf2 = blk_blockalign(blk2, IO_BUF_SIZE);
1051 total_sectors1 = blk_nb_sectors(blk1);
1052 if (total_sectors1 < 0) {
1053 error_report("Can't get size of %s: %s",
1054 filename1, strerror(-total_sectors1));
1058 total_sectors2 = blk_nb_sectors(blk2);
1059 if (total_sectors2 < 0) {
1060 error_report("Can't get size of %s: %s",
1061 filename2, strerror(-total_sectors2));
1065 total_sectors = MIN(total_sectors1, total_sectors2);
1066 progress_base = MAX(total_sectors1, total_sectors2);
1068 qemu_progress_print(0, 100);
1070 if (strict && total_sectors1 != total_sectors2) {
1072 qprintf(quiet, "Strict mode: Image size mismatch!\n");
1077 nb_sectors = sectors_to_process(total_sectors, sector_num);
1078 if (nb_sectors <= 0) {
1081 allocated1 = bdrv_is_allocated_above(bs1, NULL, sector_num, nb_sectors,
1083 if (allocated1 < 0) {
1085 error_report("Sector allocation test failed for %s", filename1);
1089 allocated2 = bdrv_is_allocated_above(bs2, NULL, sector_num, nb_sectors,
1091 if (allocated2 < 0) {
1093 error_report("Sector allocation test failed for %s", filename2);
1096 nb_sectors = MIN(pnum1, pnum2);
1098 if (allocated1 == allocated2) {
1100 ret = blk_read(blk1, sector_num, buf1, nb_sectors);
1102 error_report("Error while reading offset %" PRId64 " of %s:"
1103 " %s", sectors_to_bytes(sector_num), filename1,
1108 ret = blk_read(blk2, sector_num, buf2, nb_sectors);
1110 error_report("Error while reading offset %" PRId64
1111 " of %s: %s", sectors_to_bytes(sector_num),
1112 filename2, strerror(-ret));
1116 ret = compare_sectors(buf1, buf2, nb_sectors, &pnum);
1117 if (ret || pnum != nb_sectors) {
1118 qprintf(quiet, "Content mismatch at offset %" PRId64 "!\n",
1120 ret ? sector_num : sector_num + pnum));
1128 qprintf(quiet, "Strict mode: Offset %" PRId64
1129 " allocation mismatch!\n",
1130 sectors_to_bytes(sector_num));
1135 ret = check_empty_sectors(blk1, sector_num, nb_sectors,
1136 filename1, buf1, quiet);
1138 ret = check_empty_sectors(blk2, sector_num, nb_sectors,
1139 filename2, buf1, quiet);
1143 error_report("Error while reading offset %" PRId64 ": %s",
1144 sectors_to_bytes(sector_num), strerror(-ret));
1150 sector_num += nb_sectors;
1151 qemu_progress_print(((float) nb_sectors / progress_base)*100, 100);
1154 if (total_sectors1 != total_sectors2) {
1155 BlockBackend *blk_over;
1156 int64_t total_sectors_over;
1157 const char *filename_over;
1159 qprintf(quiet, "Warning: Image size mismatch!\n");
1160 if (total_sectors1 > total_sectors2) {
1161 total_sectors_over = total_sectors1;
1163 filename_over = filename1;
1165 total_sectors_over = total_sectors2;
1167 filename_over = filename2;
1171 nb_sectors = sectors_to_process(total_sectors_over, sector_num);
1172 if (nb_sectors <= 0) {
1175 ret = bdrv_is_allocated_above(blk_bs(blk_over), NULL, sector_num,
1179 error_report("Sector allocation test failed for %s",
1186 ret = check_empty_sectors(blk_over, sector_num, nb_sectors,
1187 filename_over, buf1, quiet);
1190 error_report("Error while reading offset %" PRId64
1191 " of %s: %s", sectors_to_bytes(sector_num),
1192 filename_over, strerror(-ret));
1198 sector_num += nb_sectors;
1199 qemu_progress_print(((float) nb_sectors / progress_base)*100, 100);
1203 qprintf(quiet, "Images are identical.\n");
1213 qemu_progress_end();
1217 enum ImgConvertBlockStatus {
1223 typedef struct ImgConvertState {
1225 int64_t *src_sectors;
1226 int src_cur, src_num;
1227 int64_t src_cur_offset;
1228 int64_t total_sectors;
1229 int64_t allocated_sectors;
1230 enum ImgConvertBlockStatus status;
1231 int64_t sector_next_status;
1232 BlockBackend *target;
1235 bool target_has_backing;
1237 size_t cluster_sectors;
1241 static void convert_select_part(ImgConvertState *s, int64_t sector_num)
1243 assert(sector_num >= s->src_cur_offset);
1244 while (sector_num - s->src_cur_offset >= s->src_sectors[s->src_cur]) {
1245 s->src_cur_offset += s->src_sectors[s->src_cur];
1247 assert(s->src_cur < s->src_num);
1251 static int convert_iteration_sectors(ImgConvertState *s, int64_t sector_num)
1256 convert_select_part(s, sector_num);
1258 assert(s->total_sectors > sector_num);
1259 n = MIN(s->total_sectors - sector_num, BDRV_REQUEST_MAX_SECTORS);
1261 if (s->sector_next_status <= sector_num) {
1262 ret = bdrv_get_block_status(blk_bs(s->src[s->src_cur]),
1263 sector_num - s->src_cur_offset,
1269 if (ret & BDRV_BLOCK_ZERO) {
1270 s->status = BLK_ZERO;
1271 } else if (ret & BDRV_BLOCK_DATA) {
1272 s->status = BLK_DATA;
1273 } else if (!s->target_has_backing) {
1274 /* Without a target backing file we must copy over the contents of
1275 * the backing file as well. */
1276 /* TODO Check block status of the backing file chain to avoid
1277 * needlessly reading zeroes and limiting the iteration to the
1279 s->status = BLK_DATA;
1281 s->status = BLK_BACKING_FILE;
1284 s->sector_next_status = sector_num + n;
1287 n = MIN(n, s->sector_next_status - sector_num);
1288 if (s->status == BLK_DATA) {
1289 n = MIN(n, s->buf_sectors);
1292 /* We need to write complete clusters for compressed images, so if an
1293 * unallocated area is shorter than that, we must consider the whole
1294 * cluster allocated. */
1295 if (s->compressed) {
1296 if (n < s->cluster_sectors) {
1297 n = MIN(s->cluster_sectors, s->total_sectors - sector_num);
1298 s->status = BLK_DATA;
1300 n = QEMU_ALIGN_DOWN(n, s->cluster_sectors);
1307 static int convert_read(ImgConvertState *s, int64_t sector_num, int nb_sectors,
1313 if (s->status == BLK_ZERO || s->status == BLK_BACKING_FILE) {
1317 assert(nb_sectors <= s->buf_sectors);
1318 while (nb_sectors > 0) {
1322 /* In the case of compression with multiple source files, we can get a
1323 * nb_sectors that spreads into the next part. So we must be able to
1324 * read across multiple BDSes for one convert_read() call. */
1325 convert_select_part(s, sector_num);
1326 blk = s->src[s->src_cur];
1327 bs_sectors = s->src_sectors[s->src_cur];
1329 n = MIN(nb_sectors, bs_sectors - (sector_num - s->src_cur_offset));
1330 ret = blk_read(blk, sector_num - s->src_cur_offset, buf, n);
1337 buf += n * BDRV_SECTOR_SIZE;
1343 static int convert_write(ImgConvertState *s, int64_t sector_num, int nb_sectors,
1348 while (nb_sectors > 0) {
1351 switch (s->status) {
1352 case BLK_BACKING_FILE:
1353 /* If we have a backing file, leave clusters unallocated that are
1354 * unallocated in the source image, so that the backing file is
1355 * visible at the respective offset. */
1356 assert(s->target_has_backing);
1360 /* We must always write compressed clusters as a whole, so don't
1361 * try to find zeroed parts in the buffer. We can only save the
1362 * write if the buffer is completely zeroed and we're allowed to
1363 * keep the target sparse. */
1364 if (s->compressed) {
1365 if (s->has_zero_init && s->min_sparse &&
1366 buffer_is_zero(buf, n * BDRV_SECTOR_SIZE))
1368 assert(!s->target_has_backing);
1372 ret = blk_write_compressed(s->target, sector_num, buf, n);
1379 /* If there is real non-zero data or we're told to keep the target
1380 * fully allocated (-S 0), we must write it. Otherwise we can treat
1381 * it as zero sectors. */
1382 if (!s->min_sparse ||
1383 is_allocated_sectors_min(buf, n, &n, s->min_sparse))
1385 ret = blk_write(s->target, sector_num, buf, n);
1394 if (s->has_zero_init) {
1397 ret = blk_write_zeroes(s->target, sector_num, n, 0);
1406 buf += n * BDRV_SECTOR_SIZE;
1412 static int convert_do_copy(ImgConvertState *s)
1414 uint8_t *buf = NULL;
1415 int64_t sector_num, allocated_done;
1419 /* Check whether we have zero initialisation or can get it efficiently */
1420 s->has_zero_init = s->min_sparse && !s->target_has_backing
1421 ? bdrv_has_zero_init(blk_bs(s->target))
1424 if (!s->has_zero_init && !s->target_has_backing &&
1425 bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)))
1427 ret = bdrv_make_zero(blk_bs(s->target), BDRV_REQ_MAY_UNMAP);
1429 s->has_zero_init = true;
1433 /* Allocate buffer for copied data. For compressed images, only one cluster
1434 * can be copied at a time. */
1435 if (s->compressed) {
1436 if (s->cluster_sectors <= 0 || s->cluster_sectors > s->buf_sectors) {
1437 error_report("invalid cluster size");
1441 s->buf_sectors = s->cluster_sectors;
1443 buf = blk_blockalign(s->target, s->buf_sectors * BDRV_SECTOR_SIZE);
1445 /* Calculate allocated sectors for progress */
1446 s->allocated_sectors = 0;
1448 while (sector_num < s->total_sectors) {
1449 n = convert_iteration_sectors(s, sector_num);
1454 if (s->status == BLK_DATA) {
1455 s->allocated_sectors += n;
1462 s->src_cur_offset = 0;
1463 s->sector_next_status = 0;
1468 while (sector_num < s->total_sectors) {
1469 n = convert_iteration_sectors(s, sector_num);
1474 if (s->status == BLK_DATA) {
1475 allocated_done += n;
1476 qemu_progress_print(100.0 * allocated_done / s->allocated_sectors,
1480 ret = convert_read(s, sector_num, n, buf);
1482 error_report("error while reading sector %" PRId64
1483 ": %s", sector_num, strerror(-ret));
1487 ret = convert_write(s, sector_num, n, buf);
1489 error_report("error while writing sector %" PRId64
1490 ": %s", sector_num, strerror(-ret));
1497 if (s->compressed) {
1498 /* signal EOF to align */
1499 ret = blk_write_compressed(s->target, 0, NULL, 0);
1511 static int img_convert(int argc, char **argv)
1513 int c, bs_n, bs_i, compress, cluster_sectors, skip_create;
1515 int progress = 0, flags, src_flags;
1516 const char *fmt, *out_fmt, *cache, *src_cache, *out_baseimg, *out_filename;
1517 BlockDriver *drv, *proto_drv;
1518 BlockBackend **blk = NULL, *out_blk = NULL;
1519 BlockDriverState **bs = NULL, *out_bs = NULL;
1520 int64_t total_sectors;
1521 int64_t *bs_sectors = NULL;
1522 size_t bufsectors = IO_BUF_SIZE / BDRV_SECTOR_SIZE;
1523 BlockDriverInfo bdi;
1524 QemuOpts *opts = NULL;
1525 QemuOptsList *create_opts = NULL;
1526 const char *out_baseimg_param;
1527 char *options = NULL;
1528 const char *snapshot_name = NULL;
1529 int min_sparse = 8; /* Need at least 4k of zeros for sparse detection */
1531 Error *local_err = NULL;
1532 QemuOpts *sn_opts = NULL;
1533 ImgConvertState state;
1538 src_cache = BDRV_DEFAULT_CACHE;
1543 c = getopt(argc, argv, "hf:O:B:ce6o:s:l:S:pt:T:qn");
1559 out_baseimg = optarg;
1565 error_report("option -e is deprecated, please use \'-o "
1566 "encryption\' instead!");
1570 error_report("option -6 is deprecated, please use \'-o "
1571 "compat6\' instead!");
1575 if (!is_valid_option_list(optarg)) {
1576 error_report("Invalid option list: %s", optarg);
1581 options = g_strdup(optarg);
1583 char *old_options = options;
1584 options = g_strdup_printf("%s,%s", options, optarg);
1585 g_free(old_options);
1589 snapshot_name = optarg;
1592 if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) {
1593 sn_opts = qemu_opts_parse(&internal_snapshot_opts, optarg, 0);
1595 error_report("Failed in parsing snapshot param '%s'",
1601 snapshot_name = optarg;
1608 sval = strtosz_suffix(optarg, &end, STRTOSZ_DEFSUFFIX_B);
1609 if (sval < 0 || *end) {
1610 error_report("Invalid minimum zero buffer size for sparse output specified");
1615 min_sparse = sval / BDRV_SECTOR_SIZE;
1636 /* Initialize before goto out */
1640 qemu_progress_init(progress, 1.0);
1643 bs_n = argc - optind - 1;
1644 out_filename = bs_n >= 1 ? argv[argc - 1] : NULL;
1646 if (options && has_help_option(options)) {
1647 ret = print_block_option_help(out_filename, out_fmt);
1652 error_exit("Must specify image file name");
1656 if (bs_n > 1 && out_baseimg) {
1657 error_report("-B makes no sense when concatenating multiple input "
1663 src_flags = BDRV_O_FLAGS;
1664 ret = bdrv_parse_cache_flags(src_cache, &src_flags);
1666 error_report("Invalid source cache option: %s", src_cache);
1670 qemu_progress_print(0, 100);
1672 blk = g_new0(BlockBackend *, bs_n);
1673 bs = g_new0(BlockDriverState *, bs_n);
1674 bs_sectors = g_new(int64_t, bs_n);
1677 for (bs_i = 0; bs_i < bs_n; bs_i++) {
1678 char *id = bs_n > 1 ? g_strdup_printf("source_%d", bs_i)
1679 : g_strdup("source");
1680 blk[bs_i] = img_open(id, argv[optind + bs_i], fmt, src_flags,
1687 bs[bs_i] = blk_bs(blk[bs_i]);
1688 bs_sectors[bs_i] = blk_nb_sectors(blk[bs_i]);
1689 if (bs_sectors[bs_i] < 0) {
1690 error_report("Could not get size of %s: %s",
1691 argv[optind + bs_i], strerror(-bs_sectors[bs_i]));
1695 total_sectors += bs_sectors[bs_i];
1699 ret = bdrv_snapshot_load_tmp(bs[0],
1700 qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID),
1701 qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME),
1703 } else if (snapshot_name != NULL) {
1705 error_report("No support for concatenating multiple snapshot");
1710 bdrv_snapshot_load_tmp_by_id_or_name(bs[0], snapshot_name, &local_err);
1713 error_report("Failed to load snapshot: %s",
1714 error_get_pretty(local_err));
1715 error_free(local_err);
1720 /* Find driver and parse its options */
1721 drv = bdrv_find_format(out_fmt);
1723 error_report("Unknown file format '%s'", out_fmt);
1728 proto_drv = bdrv_find_protocol(out_filename, true, &local_err);
1730 error_report_err(local_err);
1736 if (!drv->create_opts) {
1737 error_report("Format driver '%s' does not support image creation",
1743 if (!proto_drv->create_opts) {
1744 error_report("Protocol driver '%s' does not support image creation",
1745 proto_drv->format_name);
1750 create_opts = qemu_opts_append(create_opts, drv->create_opts);
1751 create_opts = qemu_opts_append(create_opts, proto_drv->create_opts);
1753 opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
1755 qemu_opts_do_parse(opts, options, NULL, &local_err);
1757 error_report_err(local_err);
1763 qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_sectors * 512,
1765 ret = add_old_style_options(out_fmt, opts, out_baseimg, NULL);
1771 /* Get backing file name if -o backing_file was used */
1772 out_baseimg_param = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE);
1773 if (out_baseimg_param) {
1774 out_baseimg = out_baseimg_param;
1777 /* Check if compression is supported */
1780 qemu_opt_get_bool(opts, BLOCK_OPT_ENCRYPT, false);
1781 const char *preallocation =
1782 qemu_opt_get(opts, BLOCK_OPT_PREALLOC);
1784 if (!drv->bdrv_write_compressed) {
1785 error_report("Compression not supported for this file format");
1791 error_report("Compression and encryption not supported at "
1798 && strcmp(preallocation, "off"))
1800 error_report("Compression and preallocation not supported at "
1808 /* Create the new image */
1809 ret = bdrv_create(drv, out_filename, opts, &local_err);
1811 error_report("%s: error while converting %s: %s",
1812 out_filename, out_fmt, error_get_pretty(local_err));
1813 error_free(local_err);
1818 flags = min_sparse ? (BDRV_O_RDWR | BDRV_O_UNMAP) : BDRV_O_RDWR;
1819 ret = bdrv_parse_cache_flags(cache, &flags);
1821 error_report("Invalid cache option: %s", cache);
1825 out_blk = img_open("target", out_filename, out_fmt, flags, true, quiet);
1830 out_bs = blk_bs(out_blk);
1832 /* increase bufsectors from the default 4096 (2M) if opt_transfer_length
1833 * or discard_alignment of the out_bs is greater. Limit to 32768 (16MB)
1835 bufsectors = MIN(32768,
1836 MAX(bufsectors, MAX(out_bs->bl.opt_transfer_length,
1837 out_bs->bl.discard_alignment))
1841 int64_t output_sectors = blk_nb_sectors(out_blk);
1842 if (output_sectors < 0) {
1843 error_report("unable to get output image length: %s",
1844 strerror(-output_sectors));
1847 } else if (output_sectors < total_sectors) {
1848 error_report("output file is smaller than input file");
1854 cluster_sectors = 0;
1855 ret = bdrv_get_info(out_bs, &bdi);
1858 error_report("could not get block driver info");
1862 compress = compress || bdi.needs_compressed_writes;
1863 cluster_sectors = bdi.cluster_size / BDRV_SECTOR_SIZE;
1866 state = (ImgConvertState) {
1868 .src_sectors = bs_sectors,
1870 .total_sectors = total_sectors,
1872 .compressed = compress,
1873 .target_has_backing = (bool) out_baseimg,
1874 .min_sparse = min_sparse,
1875 .cluster_sectors = cluster_sectors,
1876 .buf_sectors = bufsectors,
1878 ret = convert_do_copy(&state);
1882 qemu_progress_print(100, 0);
1884 qemu_progress_end();
1885 qemu_opts_del(opts);
1886 qemu_opts_free(create_opts);
1887 qemu_opts_del(sn_opts);
1891 for (bs_i = 0; bs_i < bs_n; bs_i++) {
1892 blk_unref(blk[bs_i]);
1907 static void dump_snapshots(BlockDriverState *bs)
1909 QEMUSnapshotInfo *sn_tab, *sn;
1912 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1915 printf("Snapshot list:\n");
1916 bdrv_snapshot_dump(fprintf, stdout, NULL);
1918 for(i = 0; i < nb_sns; i++) {
1920 bdrv_snapshot_dump(fprintf, stdout, sn);
1926 static void dump_json_image_info_list(ImageInfoList *list)
1928 Error *local_err = NULL;
1930 QmpOutputVisitor *ov = qmp_output_visitor_new();
1932 visit_type_ImageInfoList(qmp_output_get_visitor(ov),
1933 &list, NULL, &local_err);
1934 obj = qmp_output_get_qobject(ov);
1935 str = qobject_to_json_pretty(obj);
1936 assert(str != NULL);
1937 printf("%s\n", qstring_get_str(str));
1938 qobject_decref(obj);
1939 qmp_output_visitor_cleanup(ov);
1943 static void dump_json_image_info(ImageInfo *info)
1945 Error *local_err = NULL;
1947 QmpOutputVisitor *ov = qmp_output_visitor_new();
1949 visit_type_ImageInfo(qmp_output_get_visitor(ov),
1950 &info, NULL, &local_err);
1951 obj = qmp_output_get_qobject(ov);
1952 str = qobject_to_json_pretty(obj);
1953 assert(str != NULL);
1954 printf("%s\n", qstring_get_str(str));
1955 qobject_decref(obj);
1956 qmp_output_visitor_cleanup(ov);
1960 static void dump_human_image_info_list(ImageInfoList *list)
1962 ImageInfoList *elem;
1965 for (elem = list; elem; elem = elem->next) {
1971 bdrv_image_info_dump(fprintf, stdout, elem->value);
1975 static gboolean str_equal_func(gconstpointer a, gconstpointer b)
1977 return strcmp(a, b) == 0;
1981 * Open an image file chain and return an ImageInfoList
1983 * @filename: topmost image filename
1984 * @fmt: topmost image format (may be NULL to autodetect)
1985 * @chain: true - enumerate entire backing file chain
1986 * false - only topmost image file
1988 * Returns a list of ImageInfo objects or NULL if there was an error opening an
1989 * image file. If there was an error a message will have been printed to
1992 static ImageInfoList *collect_image_info_list(const char *filename,
1996 ImageInfoList *head = NULL;
1997 ImageInfoList **last = &head;
1998 GHashTable *filenames;
2001 filenames = g_hash_table_new_full(g_str_hash, str_equal_func, NULL, NULL);
2005 BlockDriverState *bs;
2007 ImageInfoList *elem;
2009 if (g_hash_table_lookup_extended(filenames, filename, NULL, NULL)) {
2010 error_report("Backing file '%s' creates an infinite loop.",
2014 g_hash_table_insert(filenames, (gpointer)filename, NULL);
2016 blk = img_open("image", filename, fmt,
2017 BDRV_O_FLAGS | BDRV_O_NO_BACKING, false, false);
2023 bdrv_query_image_info(bs, &info, &err);
2025 error_report_err(err);
2030 elem = g_new0(ImageInfoList, 1);
2037 filename = fmt = NULL;
2039 if (info->has_full_backing_filename) {
2040 filename = info->full_backing_filename;
2041 } else if (info->has_backing_filename) {
2042 filename = info->backing_filename;
2044 if (info->has_backing_filename_format) {
2045 fmt = info->backing_filename_format;
2049 g_hash_table_destroy(filenames);
2053 qapi_free_ImageInfoList(head);
2054 g_hash_table_destroy(filenames);
2058 static int img_info(int argc, char **argv)
2061 OutputFormat output_format = OFORMAT_HUMAN;
2063 const char *filename, *fmt, *output;
2064 ImageInfoList *list;
2069 int option_index = 0;
2070 static const struct option long_options[] = {
2071 {"help", no_argument, 0, 'h'},
2072 {"format", required_argument, 0, 'f'},
2073 {"output", required_argument, 0, OPTION_OUTPUT},
2074 {"backing-chain", no_argument, 0, OPTION_BACKING_CHAIN},
2077 c = getopt_long(argc, argv, "f:h",
2078 long_options, &option_index);
2093 case OPTION_BACKING_CHAIN:
2098 if (optind != argc - 1) {
2099 error_exit("Expecting one image file name");
2101 filename = argv[optind++];
2103 if (output && !strcmp(output, "json")) {
2104 output_format = OFORMAT_JSON;
2105 } else if (output && !strcmp(output, "human")) {
2106 output_format = OFORMAT_HUMAN;
2107 } else if (output) {
2108 error_report("--output must be used with human or json as argument.");
2112 list = collect_image_info_list(filename, fmt, chain);
2117 switch (output_format) {
2119 dump_human_image_info_list(list);
2123 dump_json_image_info_list(list);
2125 dump_json_image_info(list->value);
2130 qapi_free_ImageInfoList(list);
2135 typedef struct MapEntry {
2141 BlockDriverState *bs;
2144 static void dump_map_entry(OutputFormat output_format, MapEntry *e,
2147 switch (output_format) {
2149 if ((e->flags & BDRV_BLOCK_DATA) &&
2150 !(e->flags & BDRV_BLOCK_OFFSET_VALID)) {
2151 error_report("File contains external, encrypted or compressed clusters.");
2154 if ((e->flags & (BDRV_BLOCK_DATA|BDRV_BLOCK_ZERO)) == BDRV_BLOCK_DATA) {
2155 printf("%#-16"PRIx64"%#-16"PRIx64"%#-16"PRIx64"%s\n",
2156 e->start, e->length, e->offset, e->bs->filename);
2158 /* This format ignores the distinction between 0, ZERO and ZERO|DATA.
2159 * Modify the flags here to allow more coalescing.
2162 (next->flags & (BDRV_BLOCK_DATA|BDRV_BLOCK_ZERO)) != BDRV_BLOCK_DATA) {
2163 next->flags &= ~BDRV_BLOCK_DATA;
2164 next->flags |= BDRV_BLOCK_ZERO;
2168 printf("%s{ \"start\": %"PRId64", \"length\": %"PRId64", \"depth\": %d,"
2169 " \"zero\": %s, \"data\": %s",
2170 (e->start == 0 ? "[" : ",\n"),
2171 e->start, e->length, e->depth,
2172 (e->flags & BDRV_BLOCK_ZERO) ? "true" : "false",
2173 (e->flags & BDRV_BLOCK_DATA) ? "true" : "false");
2174 if (e->flags & BDRV_BLOCK_OFFSET_VALID) {
2175 printf(", \"offset\": %"PRId64"", e->offset);
2186 static int get_block_status(BlockDriverState *bs, int64_t sector_num,
2187 int nb_sectors, MapEntry *e)
2192 /* As an optimization, we could cache the current range of unallocated
2193 * clusters in each file of the chain, and avoid querying the same
2199 ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &nb_sectors);
2204 if (ret & (BDRV_BLOCK_ZERO|BDRV_BLOCK_DATA)) {
2207 bs = bs->backing_hd;
2216 e->start = sector_num * BDRV_SECTOR_SIZE;
2217 e->length = nb_sectors * BDRV_SECTOR_SIZE;
2218 e->flags = ret & ~BDRV_BLOCK_OFFSET_MASK;
2219 e->offset = ret & BDRV_BLOCK_OFFSET_MASK;
2225 static int img_map(int argc, char **argv)
2228 OutputFormat output_format = OFORMAT_HUMAN;
2230 BlockDriverState *bs;
2231 const char *filename, *fmt, *output;
2233 MapEntry curr = { .length = 0 }, next;
2239 int option_index = 0;
2240 static const struct option long_options[] = {
2241 {"help", no_argument, 0, 'h'},
2242 {"format", required_argument, 0, 'f'},
2243 {"output", required_argument, 0, OPTION_OUTPUT},
2246 c = getopt_long(argc, argv, "f:h",
2247 long_options, &option_index);
2264 if (optind != argc - 1) {
2265 error_exit("Expecting one image file name");
2267 filename = argv[optind];
2269 if (output && !strcmp(output, "json")) {
2270 output_format = OFORMAT_JSON;
2271 } else if (output && !strcmp(output, "human")) {
2272 output_format = OFORMAT_HUMAN;
2273 } else if (output) {
2274 error_report("--output must be used with human or json as argument.");
2278 blk = img_open("image", filename, fmt, BDRV_O_FLAGS, true, false);
2284 if (output_format == OFORMAT_HUMAN) {
2285 printf("%-16s%-16s%-16s%s\n", "Offset", "Length", "Mapped to", "File");
2288 length = blk_getlength(blk);
2289 while (curr.start + curr.length < length) {
2290 int64_t nsectors_left;
2294 sector_num = (curr.start + curr.length) >> BDRV_SECTOR_BITS;
2296 /* Probe up to 1 GiB at a time. */
2297 nsectors_left = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE) - sector_num;
2298 n = MIN(1 << (30 - BDRV_SECTOR_BITS), nsectors_left);
2299 ret = get_block_status(bs, sector_num, n, &next);
2302 error_report("Could not read file metadata: %s", strerror(-ret));
2306 if (curr.length != 0 && curr.flags == next.flags &&
2307 curr.depth == next.depth &&
2308 ((curr.flags & BDRV_BLOCK_OFFSET_VALID) == 0 ||
2309 curr.offset + curr.length == next.offset)) {
2310 curr.length += next.length;
2314 if (curr.length > 0) {
2315 dump_map_entry(output_format, &curr, &next);
2320 dump_map_entry(output_format, &curr, NULL);
2327 #define SNAPSHOT_LIST 1
2328 #define SNAPSHOT_CREATE 2
2329 #define SNAPSHOT_APPLY 3
2330 #define SNAPSHOT_DELETE 4
2332 static int img_snapshot(int argc, char **argv)
2335 BlockDriverState *bs;
2336 QEMUSnapshotInfo sn;
2337 char *filename, *snapshot_name = NULL;
2338 int c, ret = 0, bdrv_oflags;
2344 bdrv_oflags = BDRV_O_FLAGS | BDRV_O_RDWR;
2345 /* Parse commandline parameters */
2347 c = getopt(argc, argv, "la:c:d:hq");
2358 error_exit("Cannot mix '-l', '-a', '-c', '-d'");
2361 action = SNAPSHOT_LIST;
2362 bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */
2366 error_exit("Cannot mix '-l', '-a', '-c', '-d'");
2369 action = SNAPSHOT_APPLY;
2370 snapshot_name = optarg;
2374 error_exit("Cannot mix '-l', '-a', '-c', '-d'");
2377 action = SNAPSHOT_CREATE;
2378 snapshot_name = optarg;
2382 error_exit("Cannot mix '-l', '-a', '-c', '-d'");
2385 action = SNAPSHOT_DELETE;
2386 snapshot_name = optarg;
2394 if (optind != argc - 1) {
2395 error_exit("Expecting one image file name");
2397 filename = argv[optind++];
2399 /* Open the image */
2400 blk = img_open("image", filename, NULL, bdrv_oflags, true, quiet);
2406 /* Perform the requested action */
2412 case SNAPSHOT_CREATE:
2413 memset(&sn, 0, sizeof(sn));
2414 pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
2416 qemu_gettimeofday(&tv);
2417 sn.date_sec = tv.tv_sec;
2418 sn.date_nsec = tv.tv_usec * 1000;
2420 ret = bdrv_snapshot_create(bs, &sn);
2422 error_report("Could not create snapshot '%s': %d (%s)",
2423 snapshot_name, ret, strerror(-ret));
2427 case SNAPSHOT_APPLY:
2428 ret = bdrv_snapshot_goto(bs, snapshot_name);
2430 error_report("Could not apply snapshot '%s': %d (%s)",
2431 snapshot_name, ret, strerror(-ret));
2435 case SNAPSHOT_DELETE:
2436 bdrv_snapshot_delete_by_id_or_name(bs, snapshot_name, &err);
2438 error_report("Could not delete snapshot '%s': (%s)",
2439 snapshot_name, error_get_pretty(err));
2454 static int img_rebase(int argc, char **argv)
2456 BlockBackend *blk = NULL, *blk_old_backing = NULL, *blk_new_backing = NULL;
2457 BlockDriverState *bs = NULL;
2459 const char *fmt, *cache, *src_cache, *out_basefmt, *out_baseimg;
2460 int c, flags, src_flags, ret;
2464 Error *local_err = NULL;
2466 /* Parse commandline parameters */
2468 cache = BDRV_DEFAULT_CACHE;
2469 src_cache = BDRV_DEFAULT_CACHE;
2473 c = getopt(argc, argv, "hf:F:b:upt:T:q");
2486 out_basefmt = optarg;
2489 out_baseimg = optarg;
2513 if (optind != argc - 1) {
2514 error_exit("Expecting one image file name");
2516 if (!unsafe && !out_baseimg) {
2517 error_exit("Must specify backing file (-b) or use unsafe mode (-u)");
2519 filename = argv[optind++];
2521 qemu_progress_init(progress, 2.0);
2522 qemu_progress_print(0, 100);
2524 flags = BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
2525 ret = bdrv_parse_cache_flags(cache, &flags);
2527 error_report("Invalid cache option: %s", cache);
2531 src_flags = BDRV_O_FLAGS;
2532 ret = bdrv_parse_cache_flags(src_cache, &src_flags);
2534 error_report("Invalid source cache option: %s", src_cache);
2541 * Ignore the old backing file for unsafe rebase in case we want to correct
2542 * the reference to a renamed or moved backing file.
2544 blk = img_open("image", filename, fmt, flags, true, quiet);
2551 if (out_basefmt != NULL) {
2552 if (bdrv_find_format(out_basefmt) == NULL) {
2553 error_report("Invalid format name: '%s'", out_basefmt);
2559 /* For safe rebasing we need to compare old and new backing file */
2561 char backing_name[PATH_MAX];
2562 QDict *options = NULL;
2564 if (bs->backing_format[0] != '\0') {
2565 options = qdict_new();
2566 qdict_put(options, "driver", qstring_from_str(bs->backing_format));
2569 bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
2570 blk_old_backing = blk_new_open("old_backing", backing_name, NULL,
2571 options, src_flags, &local_err);
2572 if (!blk_old_backing) {
2573 error_report("Could not open old backing file '%s': %s",
2574 backing_name, error_get_pretty(local_err));
2575 error_free(local_err);
2579 if (out_baseimg[0]) {
2581 options = qdict_new();
2582 qdict_put(options, "driver", qstring_from_str(out_basefmt));
2587 blk_new_backing = blk_new_open("new_backing", out_baseimg, NULL,
2588 options, src_flags, &local_err);
2589 if (!blk_new_backing) {
2590 error_report("Could not open new backing file '%s': %s",
2591 out_baseimg, error_get_pretty(local_err));
2592 error_free(local_err);
2599 * Check each unallocated cluster in the COW file. If it is unallocated,
2600 * accesses go to the backing file. We must therefore compare this cluster
2601 * in the old and new backing file, and if they differ we need to copy it
2602 * from the old backing file into the COW file.
2604 * If qemu-img crashes during this step, no harm is done. The content of
2605 * the image is the same as the original one at any time.
2608 int64_t num_sectors;
2609 int64_t old_backing_num_sectors;
2610 int64_t new_backing_num_sectors = 0;
2615 float local_progress = 0;
2617 buf_old = blk_blockalign(blk, IO_BUF_SIZE);
2618 buf_new = blk_blockalign(blk, IO_BUF_SIZE);
2620 num_sectors = blk_nb_sectors(blk);
2621 if (num_sectors < 0) {
2622 error_report("Could not get size of '%s': %s",
2623 filename, strerror(-num_sectors));
2627 old_backing_num_sectors = blk_nb_sectors(blk_old_backing);
2628 if (old_backing_num_sectors < 0) {
2629 char backing_name[PATH_MAX];
2631 bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
2632 error_report("Could not get size of '%s': %s",
2633 backing_name, strerror(-old_backing_num_sectors));
2637 if (blk_new_backing) {
2638 new_backing_num_sectors = blk_nb_sectors(blk_new_backing);
2639 if (new_backing_num_sectors < 0) {
2640 error_report("Could not get size of '%s': %s",
2641 out_baseimg, strerror(-new_backing_num_sectors));
2647 if (num_sectors != 0) {
2648 local_progress = (float)100 /
2649 (num_sectors / MIN(num_sectors, IO_BUF_SIZE / 512));
2652 for (sector = 0; sector < num_sectors; sector += n) {
2654 /* How many sectors can we handle with the next read? */
2655 if (sector + (IO_BUF_SIZE / 512) <= num_sectors) {
2656 n = (IO_BUF_SIZE / 512);
2658 n = num_sectors - sector;
2661 /* If the cluster is allocated, we don't need to take action */
2662 ret = bdrv_is_allocated(bs, sector, n, &n);
2664 error_report("error while reading image metadata: %s",
2673 * Read old and new backing file and take into consideration that
2674 * backing files may be smaller than the COW image.
2676 if (sector >= old_backing_num_sectors) {
2677 memset(buf_old, 0, n * BDRV_SECTOR_SIZE);
2679 if (sector + n > old_backing_num_sectors) {
2680 n = old_backing_num_sectors - sector;
2683 ret = blk_read(blk_old_backing, sector, buf_old, n);
2685 error_report("error while reading from old backing file");
2690 if (sector >= new_backing_num_sectors || !blk_new_backing) {
2691 memset(buf_new, 0, n * BDRV_SECTOR_SIZE);
2693 if (sector + n > new_backing_num_sectors) {
2694 n = new_backing_num_sectors - sector;
2697 ret = blk_read(blk_new_backing, sector, buf_new, n);
2699 error_report("error while reading from new backing file");
2704 /* If they differ, we need to write to the COW file */
2705 uint64_t written = 0;
2707 while (written < n) {
2710 if (compare_sectors(buf_old + written * 512,
2711 buf_new + written * 512, n - written, &pnum))
2713 ret = blk_write(blk, sector + written,
2714 buf_old + written * 512, pnum);
2716 error_report("Error while writing to COW image: %s",
2724 qemu_progress_print(local_progress, 100);
2727 qemu_vfree(buf_old);
2728 qemu_vfree(buf_new);
2732 * Change the backing file. All clusters that are different from the old
2733 * backing file are overwritten in the COW file now, so the visible content
2734 * doesn't change when we switch the backing file.
2736 if (out_baseimg && *out_baseimg) {
2737 ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt);
2739 ret = bdrv_change_backing_file(bs, NULL, NULL);
2742 if (ret == -ENOSPC) {
2743 error_report("Could not change the backing file to '%s': No "
2744 "space left in the file header", out_baseimg);
2745 } else if (ret < 0) {
2746 error_report("Could not change the backing file to '%s': %s",
2747 out_baseimg, strerror(-ret));
2750 qemu_progress_print(100, 0);
2752 * TODO At this point it is possible to check if any clusters that are
2753 * allocated in the COW file are the same in the backing file. If so, they
2754 * could be dropped from the COW file. Don't do this before switching the
2755 * backing file, in case of a crash this would lead to corruption.
2758 qemu_progress_end();
2761 blk_unref(blk_old_backing);
2762 blk_unref(blk_new_backing);
2772 static int img_resize(int argc, char **argv)
2775 int c, ret, relative;
2776 const char *filename, *fmt, *size;
2777 int64_t n, total_size;
2779 BlockBackend *blk = NULL;
2781 static QemuOptsList resize_options = {
2782 .name = "resize_options",
2783 .head = QTAILQ_HEAD_INITIALIZER(resize_options.head),
2786 .name = BLOCK_OPT_SIZE,
2787 .type = QEMU_OPT_SIZE,
2788 .help = "Virtual disk size"
2795 /* Remove size from argv manually so that negative numbers are not treated
2796 * as options by getopt. */
2798 error_exit("Not enough arguments");
2802 size = argv[--argc];
2804 /* Parse getopt arguments */
2807 c = getopt(argc, argv, "f:hq");
2824 if (optind != argc - 1) {
2825 error_exit("Expecting one image file name");
2827 filename = argv[optind++];
2829 /* Choose grow, shrink, or absolute resize mode */
2845 param = qemu_opts_create(&resize_options, NULL, 0, &error_abort);
2846 qemu_opt_set(param, BLOCK_OPT_SIZE, size, &err);
2848 error_report_err(err);
2850 qemu_opts_del(param);
2853 n = qemu_opt_get_size(param, BLOCK_OPT_SIZE, 0);
2854 qemu_opts_del(param);
2856 blk = img_open("image", filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR,
2864 total_size = blk_getlength(blk) + n * relative;
2868 if (total_size <= 0) {
2869 error_report("New image size must be positive");
2874 ret = blk_truncate(blk, total_size);
2877 qprintf(quiet, "Image resized.\n");
2880 error_report("This image does not support resize");
2883 error_report("Image is read-only");
2886 error_report("Error resizing image (%d)", -ret);
2897 static void amend_status_cb(BlockDriverState *bs,
2898 int64_t offset, int64_t total_work_size)
2900 qemu_progress_print(100.f * offset / total_work_size, 0);
2903 static int img_amend(int argc, char **argv)
2907 char *options = NULL;
2908 QemuOptsList *create_opts = NULL;
2909 QemuOpts *opts = NULL;
2910 const char *fmt = NULL, *filename, *cache;
2912 bool quiet = false, progress = false;
2913 BlockBackend *blk = NULL;
2914 BlockDriverState *bs = NULL;
2916 cache = BDRV_DEFAULT_CACHE;
2918 c = getopt(argc, argv, "ho:f:t:pq");
2929 if (!is_valid_option_list(optarg)) {
2930 error_report("Invalid option list: %s", optarg);
2935 options = g_strdup(optarg);
2937 char *old_options = options;
2938 options = g_strdup_printf("%s,%s", options, optarg);
2939 g_free(old_options);
2958 error_exit("Must specify options (-o)");
2964 qemu_progress_init(progress, 1.0);
2966 filename = (optind == argc - 1) ? argv[argc - 1] : NULL;
2967 if (fmt && has_help_option(options)) {
2968 /* If a format is explicitly specified (and possibly no filename is
2969 * given), print option help here */
2970 ret = print_block_option_help(filename, fmt);
2974 if (optind != argc - 1) {
2975 error_report("Expecting one image file name");
2980 flags = BDRV_O_FLAGS | BDRV_O_RDWR;
2981 ret = bdrv_parse_cache_flags(cache, &flags);
2983 error_report("Invalid cache option: %s", cache);
2987 blk = img_open("image", filename, fmt, flags, true, quiet);
2994 fmt = bs->drv->format_name;
2996 if (has_help_option(options)) {
2997 /* If the format was auto-detected, print option help here */
2998 ret = print_block_option_help(filename, fmt);
3002 if (!bs->drv->create_opts) {
3003 error_report("Format driver '%s' does not support any options to amend",
3009 create_opts = qemu_opts_append(create_opts, bs->drv->create_opts);
3010 opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
3012 qemu_opts_do_parse(opts, options, NULL, &err);
3014 error_report_err(err);
3020 /* In case the driver does not call amend_status_cb() */
3021 qemu_progress_print(0.f, 0);
3022 ret = bdrv_amend_options(bs, opts, &amend_status_cb);
3023 qemu_progress_print(100.f, 0);
3025 error_report("Error while amending options: %s", strerror(-ret));
3030 qemu_progress_end();
3033 qemu_opts_del(opts);
3034 qemu_opts_free(create_opts);
3043 static const img_cmd_t img_cmds[] = {
3044 #define DEF(option, callback, arg_string) \
3045 { option, callback },
3046 #include "qemu-img-cmds.h"
3052 int main(int argc, char **argv)
3054 const img_cmd_t *cmd;
3055 const char *cmdname;
3056 Error *local_error = NULL;
3058 static const struct option long_options[] = {
3059 {"help", no_argument, 0, 'h'},
3060 {"version", no_argument, 0, 'v'},
3065 signal(SIGPIPE, SIG_IGN);
3068 error_set_progname(argv[0]);
3069 qemu_init_exec_dir(argv[0]);
3071 if (qemu_init_main_loop(&local_error)) {
3072 error_report_err(local_error);
3078 error_exit("Not enough arguments");
3082 /* find the command */
3083 for (cmd = img_cmds; cmd->name != NULL; cmd++) {
3084 if (!strcmp(cmdname, cmd->name)) {
3085 return cmd->handler(argc - 1, argv + 1);
3089 c = getopt_long(argc, argv, "h", long_options, NULL);
3095 printf(QEMU_IMG_VERSION);
3100 error_exit("Command not found: %s", cmdname);