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Diffstat (limited to 'src/qemu-img.c')
| -rw-r--r-- | src/qemu-img.c | 3103 |
1 files changed, 3103 insertions, 0 deletions
diff --git a/src/qemu-img.c b/src/qemu-img.c new file mode 100644 index 0000000..033011c --- /dev/null +++ b/src/qemu-img.c @@ -0,0 +1,3103 @@ +/* + * QEMU disk image utility + * + * Copyright (c) 2003-2008 Fabrice Bellard + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ +#include "qapi-visit.h" +#include "qapi/qmp-output-visitor.h" +#include "qapi/qmp/qerror.h" +#include "qapi/qmp/qjson.h" +#include "qemu-common.h" +#include "qemu/option.h" +#include "qemu/error-report.h" +#include "qemu/osdep.h" +#include "sysemu/sysemu.h" +#include "sysemu/block-backend.h" +#include "block/block_int.h" +#include "block/blockjob.h" +#include "block/qapi.h" +#include <getopt.h> + +#define QEMU_IMG_VERSION "qemu-img version " QEMU_VERSION QEMU_PKGVERSION \ + ", Copyright (c) 2004-2008 Fabrice Bellard\n" + +typedef struct img_cmd_t { + const char *name; + int (*handler)(int argc, char **argv); +} img_cmd_t; + +enum { + OPTION_OUTPUT = 256, + OPTION_BACKING_CHAIN = 257, +}; + +typedef enum OutputFormat { + OFORMAT_JSON, + OFORMAT_HUMAN, +} OutputFormat; + +/* Default to cache=writeback as data integrity is not important for qemu-tcg. */ +#define BDRV_O_FLAGS BDRV_O_CACHE_WB +#define BDRV_DEFAULT_CACHE "writeback" + +static void format_print(void *opaque, const char *name) +{ + printf(" %s", name); +} + +static void QEMU_NORETURN GCC_FMT_ATTR(1, 2) error_exit(const char *fmt, ...) +{ + va_list ap; + + error_printf("qemu-img: "); + + va_start(ap, fmt); + error_vprintf(fmt, ap); + va_end(ap); + + error_printf("\nTry 'qemu-img --help' for more information\n"); + exit(EXIT_FAILURE); +} + +/* Please keep in synch with qemu-img.texi */ +static void QEMU_NORETURN help(void) +{ + const char *help_msg = + QEMU_IMG_VERSION + "usage: qemu-img command [command options]\n" + "QEMU disk image utility\n" + "\n" + "Command syntax:\n" +#define DEF(option, callback, arg_string) \ + " " arg_string "\n" +#include "qemu-img-cmds.h" +#undef DEF +#undef GEN_DOCS + "\n" + "Command parameters:\n" + " 'filename' is a disk image filename\n" + " 'fmt' is the disk image format. It is guessed automatically in most cases\n" + " 'cache' is the cache mode used to write the output disk image, the valid\n" + " options are: 'none', 'writeback' (default, except for convert), 'writethrough',\n" + " 'directsync' and 'unsafe' (default for convert)\n" + " 'src_cache' is the cache mode used to read input disk images, the valid\n" + " options are the same as for the 'cache' option\n" + " 'size' is the disk image size in bytes. Optional suffixes\n" + " 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M),\n" + " 'T' (terabyte, 1024G), 'P' (petabyte, 1024T) and 'E' (exabyte, 1024P) are\n" + " supported. 'b' is ignored.\n" + " 'output_filename' is the destination disk image filename\n" + " 'output_fmt' is the destination format\n" + " 'options' is a comma separated list of format specific options in a\n" + " name=value format. Use -o ? for an overview of the options supported by the\n" + " used format\n" + " 'snapshot_param' is param used for internal snapshot, format\n" + " is 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" + " '[ID_OR_NAME]'\n" + " 'snapshot_id_or_name' is deprecated, use 'snapshot_param'\n" + " instead\n" + " '-c' indicates that target image must be compressed (qcow format only)\n" + " '-u' enables unsafe rebasing. It is assumed that old and new backing file\n" + " match exactly. The image doesn't need a working backing file before\n" + " rebasing in this case (useful for renaming the backing file)\n" + " '-h' with or without a command shows this help and lists the supported formats\n" + " '-p' show progress of command (only certain commands)\n" + " '-q' use Quiet mode - do not print any output (except errors)\n" + " '-S' indicates the consecutive number of bytes (defaults to 4k) that must\n" + " contain only zeros for qemu-img to create a sparse image during\n" + " conversion. If the number of bytes is 0, the source will not be scanned for\n" + " unallocated or zero sectors, and the destination image will always be\n" + " fully allocated\n" + " '--output' takes the format in which the output must be done (human or json)\n" + " '-n' skips the target volume creation (useful if the volume is created\n" + " prior to running qemu-img)\n" + "\n" + "Parameters to check subcommand:\n" + " '-r' tries to repair any inconsistencies that are found during the check.\n" + " '-r leaks' repairs only cluster leaks, whereas '-r all' fixes all\n" + " kinds of errors, with a higher risk of choosing the wrong fix or\n" + " hiding corruption that has already occurred.\n" + "\n" + "Parameters to snapshot subcommand:\n" + " 'snapshot' is the name of the snapshot to create, apply or delete\n" + " '-a' applies a snapshot (revert disk to saved state)\n" + " '-c' creates a snapshot\n" + " '-d' deletes a snapshot\n" + " '-l' lists all snapshots in the given image\n" + "\n" + "Parameters to compare subcommand:\n" + " '-f' first image format\n" + " '-F' second image format\n" + " '-s' run in Strict mode - fail on different image size or sector allocation\n"; + + printf("%s\nSupported formats:", help_msg); + bdrv_iterate_format(format_print, NULL); + printf("\n"); + exit(EXIT_SUCCESS); +} + +static int GCC_FMT_ATTR(2, 3) qprintf(bool quiet, const char *fmt, ...) +{ + int ret = 0; + if (!quiet) { + va_list args; + va_start(args, fmt); + ret = vprintf(fmt, args); + va_end(args); + } + return ret; +} + + +static int print_block_option_help(const char *filename, const char *fmt) +{ + BlockDriver *drv, *proto_drv; + QemuOptsList *create_opts = NULL; + Error *local_err = NULL; + + /* Find driver and parse its options */ + drv = bdrv_find_format(fmt); + if (!drv) { + error_report("Unknown file format '%s'", fmt); + return 1; + } + + create_opts = qemu_opts_append(create_opts, drv->create_opts); + if (filename) { + proto_drv = bdrv_find_protocol(filename, true, &local_err); + if (!proto_drv) { + error_report_err(local_err); + qemu_opts_free(create_opts); + return 1; + } + create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); + } + + qemu_opts_print_help(create_opts); + qemu_opts_free(create_opts); + return 0; +} + +static BlockBackend *img_open(const char *id, const char *filename, + const char *fmt, int flags, + bool require_io, bool quiet) +{ + BlockBackend *blk; + BlockDriverState *bs; + char password[256]; + Error *local_err = NULL; + QDict *options = NULL; + + if (fmt) { + options = qdict_new(); + qdict_put(options, "driver", qstring_from_str(fmt)); + } + + blk = blk_new_open(id, filename, NULL, options, flags, &local_err); + if (!blk) { + error_report("Could not open '%s': %s", filename, + error_get_pretty(local_err)); + error_free(local_err); + goto fail; + } + + bs = blk_bs(blk); + if (bdrv_is_encrypted(bs) && require_io) { + qprintf(quiet, "Disk image '%s' is encrypted.\n", filename); + if (qemu_read_password(password, sizeof(password)) < 0) { + error_report("No password given"); + goto fail; + } + if (bdrv_set_key(bs, password) < 0) { + error_report("invalid password"); + goto fail; + } + } + return blk; +fail: + blk_unref(blk); + return NULL; +} + +static int add_old_style_options(const char *fmt, QemuOpts *opts, + const char *base_filename, + const char *base_fmt) +{ + Error *err = NULL; + + if (base_filename) { + qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, &err); + if (err) { + error_report("Backing file not supported for file format '%s'", + fmt); + error_free(err); + return -1; + } + } + if (base_fmt) { + qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &err); + if (err) { + error_report("Backing file format not supported for file " + "format '%s'", fmt); + error_free(err); + return -1; + } + } + return 0; +} + +static int img_create(int argc, char **argv) +{ + int c; + uint64_t img_size = -1; + const char *fmt = "raw"; + const char *base_fmt = NULL; + const char *filename; + const char *base_filename = NULL; + char *options = NULL; + Error *local_err = NULL; + bool quiet = false; + + for(;;) { + c = getopt(argc, argv, "F:b:f:he6o:q"); + if (c == -1) { + break; + } + switch(c) { + case '?': + case 'h': + help(); + break; + case 'F': + base_fmt = optarg; + break; + case 'b': + base_filename = optarg; + break; + case 'f': + fmt = optarg; + break; + case 'e': + error_report("option -e is deprecated, please use \'-o " + "encryption\' instead!"); + goto fail; + case '6': + error_report("option -6 is deprecated, please use \'-o " + "compat6\' instead!"); + goto fail; + case 'o': + if (!is_valid_option_list(optarg)) { + error_report("Invalid option list: %s", optarg); + goto fail; + } + if (!options) { + options = g_strdup(optarg); + } else { + char *old_options = options; + options = g_strdup_printf("%s,%s", options, optarg); + g_free(old_options); + } + break; + case 'q': + quiet = true; + break; + } + } + + /* Get the filename */ + filename = (optind < argc) ? argv[optind] : NULL; + if (options && has_help_option(options)) { + g_free(options); + return print_block_option_help(filename, fmt); + } + + if (optind >= argc) { + error_exit("Expecting image file name"); + } + optind++; + + /* Get image size, if specified */ + if (optind < argc) { + int64_t sval; + char *end; + sval = qemu_strtosz_suffix(argv[optind++], &end, + QEMU_STRTOSZ_DEFSUFFIX_B); + if (sval < 0 || *end) { + if (sval == -ERANGE) { + error_report("Image size must be less than 8 EiB!"); + } else { + error_report("Invalid image size specified! You may use k, M, " + "G, T, P or E suffixes for "); + error_report("kilobytes, megabytes, gigabytes, terabytes, " + "petabytes and exabytes."); + } + goto fail; + } + img_size = (uint64_t)sval; + } + if (optind != argc) { + error_exit("Unexpected argument: %s", argv[optind]); + } + + bdrv_img_create(filename, fmt, base_filename, base_fmt, + options, img_size, BDRV_O_FLAGS, &local_err, quiet); + if (local_err) { + error_report("%s: %s", filename, error_get_pretty(local_err)); + error_free(local_err); + goto fail; + } + + g_free(options); + return 0; + +fail: + g_free(options); + return 1; +} + +static void dump_json_image_check(ImageCheck *check, bool quiet) +{ + Error *local_err = NULL; + QString *str; + QmpOutputVisitor *ov = qmp_output_visitor_new(); + QObject *obj; + visit_type_ImageCheck(qmp_output_get_visitor(ov), + &check, NULL, &local_err); + obj = qmp_output_get_qobject(ov); + str = qobject_to_json_pretty(obj); + assert(str != NULL); + qprintf(quiet, "%s\n", qstring_get_str(str)); + qobject_decref(obj); + qmp_output_visitor_cleanup(ov); + QDECREF(str); +} + +static void dump_human_image_check(ImageCheck *check, bool quiet) +{ + if (!(check->corruptions || check->leaks || check->check_errors)) { + qprintf(quiet, "No errors were found on the image.\n"); + } else { + if (check->corruptions) { + qprintf(quiet, "\n%" PRId64 " errors were found on the image.\n" + "Data may be corrupted, or further writes to the image " + "may corrupt it.\n", + check->corruptions); + } + + if (check->leaks) { + qprintf(quiet, + "\n%" PRId64 " leaked clusters were found on the image.\n" + "This means waste of disk space, but no harm to data.\n", + check->leaks); + } + + if (check->check_errors) { + qprintf(quiet, + "\n%" PRId64 + " internal errors have occurred during the check.\n", + check->check_errors); + } + } + + if (check->total_clusters != 0 && check->allocated_clusters != 0) { + qprintf(quiet, "%" PRId64 "/%" PRId64 " = %0.2f%% allocated, " + "%0.2f%% fragmented, %0.2f%% compressed clusters\n", + check->allocated_clusters, check->total_clusters, + check->allocated_clusters * 100.0 / check->total_clusters, + check->fragmented_clusters * 100.0 / check->allocated_clusters, + check->compressed_clusters * 100.0 / + check->allocated_clusters); + } + + if (check->image_end_offset) { + qprintf(quiet, + "Image end offset: %" PRId64 "\n", check->image_end_offset); + } +} + +static int collect_image_check(BlockDriverState *bs, + ImageCheck *check, + const char *filename, + const char *fmt, + int fix) +{ + int ret; + BdrvCheckResult result; + + ret = bdrv_check(bs, &result, fix); + if (ret < 0) { + return ret; + } + + check->filename = g_strdup(filename); + check->format = g_strdup(bdrv_get_format_name(bs)); + check->check_errors = result.check_errors; + check->corruptions = result.corruptions; + check->has_corruptions = result.corruptions != 0; + check->leaks = result.leaks; + check->has_leaks = result.leaks != 0; + check->corruptions_fixed = result.corruptions_fixed; + check->has_corruptions_fixed = result.corruptions != 0; + check->leaks_fixed = result.leaks_fixed; + check->has_leaks_fixed = result.leaks != 0; + check->image_end_offset = result.image_end_offset; + check->has_image_end_offset = result.image_end_offset != 0; + check->total_clusters = result.bfi.total_clusters; + check->has_total_clusters = result.bfi.total_clusters != 0; + check->allocated_clusters = result.bfi.allocated_clusters; + check->has_allocated_clusters = result.bfi.allocated_clusters != 0; + check->fragmented_clusters = result.bfi.fragmented_clusters; + check->has_fragmented_clusters = result.bfi.fragmented_clusters != 0; + check->compressed_clusters = result.bfi.compressed_clusters; + check->has_compressed_clusters = result.bfi.compressed_clusters != 0; + + return 0; +} + +/* + * Checks an image for consistency. Exit codes: + * + * 0 - Check completed, image is good + * 1 - Check not completed because of internal errors + * 2 - Check completed, image is corrupted + * 3 - Check completed, image has leaked clusters, but is good otherwise + * 63 - Checks are not supported by the image format + */ +static int img_check(int argc, char **argv) +{ + int c, ret; + OutputFormat output_format = OFORMAT_HUMAN; + const char *filename, *fmt, *output, *cache; + BlockBackend *blk; + BlockDriverState *bs; + int fix = 0; + int flags = BDRV_O_FLAGS | BDRV_O_CHECK; + ImageCheck *check; + bool quiet = false; + + fmt = NULL; + output = NULL; + cache = BDRV_DEFAULT_CACHE; + for(;;) { + int option_index = 0; + static const struct option long_options[] = { + {"help", no_argument, 0, 'h'}, + {"format", required_argument, 0, 'f'}, + {"repair", required_argument, 0, 'r'}, + {"output", required_argument, 0, OPTION_OUTPUT}, + {0, 0, 0, 0} + }; + c = getopt_long(argc, argv, "hf:r:T:q", + long_options, &option_index); + if (c == -1) { + break; + } + switch(c) { + case '?': + case 'h': + help(); + break; + case 'f': + fmt = optarg; + break; + case 'r': + flags |= BDRV_O_RDWR; + + if (!strcmp(optarg, "leaks")) { + fix = BDRV_FIX_LEAKS; + } else if (!strcmp(optarg, "all")) { + fix = BDRV_FIX_LEAKS | BDRV_FIX_ERRORS; + } else { + error_exit("Unknown option value for -r " + "(expecting 'leaks' or 'all'): %s", optarg); + } + break; + case OPTION_OUTPUT: + output = optarg; + break; + case 'T': + cache = optarg; + break; + case 'q': + quiet = true; + break; + } + } + if (optind != argc - 1) { + error_exit("Expecting one image file name"); + } + filename = argv[optind++]; + + if (output && !strcmp(output, "json")) { + output_format = OFORMAT_JSON; + } else if (output && !strcmp(output, "human")) { + output_format = OFORMAT_HUMAN; + } else if (output) { + error_report("--output must be used with human or json as argument."); + return 1; + } + + ret = bdrv_parse_cache_flags(cache, &flags); + if (ret < 0) { + error_report("Invalid source cache option: %s", cache); + return 1; + } + + blk = img_open("image", filename, fmt, flags, true, quiet); + if (!blk) { + return 1; + } + bs = blk_bs(blk); + + check = g_new0(ImageCheck, 1); + ret = collect_image_check(bs, check, filename, fmt, fix); + + if (ret == -ENOTSUP) { + error_report("This image format does not support checks"); + ret = 63; + goto fail; + } + + if (check->corruptions_fixed || check->leaks_fixed) { + int corruptions_fixed, leaks_fixed; + + leaks_fixed = check->leaks_fixed; + corruptions_fixed = check->corruptions_fixed; + + if (output_format == OFORMAT_HUMAN) { + qprintf(quiet, + "The following inconsistencies were found and repaired:\n\n" + " %" PRId64 " leaked clusters\n" + " %" PRId64 " corruptions\n\n" + "Double checking the fixed image now...\n", + check->leaks_fixed, + check->corruptions_fixed); + } + + ret = collect_image_check(bs, check, filename, fmt, 0); + + check->leaks_fixed = leaks_fixed; + check->corruptions_fixed = corruptions_fixed; + } + + if (!ret) { + switch (output_format) { + case OFORMAT_HUMAN: + dump_human_image_check(check, quiet); + break; + case OFORMAT_JSON: + dump_json_image_check(check, quiet); + break; + } + } + + if (ret || check->check_errors) { + if (ret) { + error_report("Check failed: %s", strerror(-ret)); + } else { + error_report("Check failed"); + } + ret = 1; + goto fail; + } + + if (check->corruptions) { + ret = 2; + } else if (check->leaks) { + ret = 3; + } else { + ret = 0; + } + +fail: + qapi_free_ImageCheck(check); + blk_unref(blk); + return ret; +} + +typedef struct CommonBlockJobCBInfo { + BlockDriverState *bs; + Error **errp; +} CommonBlockJobCBInfo; + +static void common_block_job_cb(void *opaque, int ret) +{ + CommonBlockJobCBInfo *cbi = opaque; + + if (ret < 0) { + error_setg_errno(cbi->errp, -ret, "Block job failed"); + } +} + +static void run_block_job(BlockJob *job, Error **errp) +{ + AioContext *aio_context = bdrv_get_aio_context(job->bs); + + do { + aio_poll(aio_context, true); + qemu_progress_print(job->len ? + ((float)job->offset / job->len * 100.f) : 0.0f, 0); + } while (!job->ready); + + block_job_complete_sync(job, errp); + + /* A block job may finish instantaneously without publishing any progress, + * so just signal completion here */ + qemu_progress_print(100.f, 0); +} + +static int img_commit(int argc, char **argv) +{ + int c, ret, flags; + const char *filename, *fmt, *cache, *base; + BlockBackend *blk; + BlockDriverState *bs, *base_bs; + bool progress = false, quiet = false, drop = false; + Error *local_err = NULL; + CommonBlockJobCBInfo cbi; + + fmt = NULL; + cache = BDRV_DEFAULT_CACHE; + base = NULL; + for(;;) { + c = getopt(argc, argv, "f:ht:b:dpq"); + if (c == -1) { + break; + } + switch(c) { + case '?': + case 'h': + help(); + break; + case 'f': + fmt = optarg; + break; + case 't': + cache = optarg; + break; + case 'b': + base = optarg; + /* -b implies -d */ + drop = true; + break; + case 'd': + drop = true; + break; + case 'p': + progress = true; + break; + case 'q': + quiet = true; + break; + } + } + + /* Progress is not shown in Quiet mode */ + if (quiet) { + progress = false; + } + + if (optind != argc - 1) { + error_exit("Expecting one image file name"); + } + filename = argv[optind++]; + + flags = BDRV_O_RDWR | BDRV_O_UNMAP; + ret = bdrv_parse_cache_flags(cache, &flags); + if (ret < 0) { + error_report("Invalid cache option: %s", cache); + return 1; + } + + blk = img_open("image", filename, fmt, flags, true, quiet); + if (!blk) { + return 1; + } + bs = blk_bs(blk); + + qemu_progress_init(progress, 1.f); + qemu_progress_print(0.f, 100); + + if (base) { + base_bs = bdrv_find_backing_image(bs, base); + if (!base_bs) { + error_setg(&local_err, QERR_BASE_NOT_FOUND, base); + goto done; + } + } else { + /* This is different from QMP, which by default uses the deepest file in + * the backing chain (i.e., the very base); however, the traditional + * behavior of qemu-img commit is using the immediate backing file. */ + base_bs = backing_bs(bs); + if (!base_bs) { + error_setg(&local_err, "Image does not have a backing file"); + goto done; + } + } + + cbi = (CommonBlockJobCBInfo){ + .errp = &local_err, + .bs = bs, + }; + + commit_active_start(bs, base_bs, 0, BLOCKDEV_ON_ERROR_REPORT, + common_block_job_cb, &cbi, &local_err); + if (local_err) { + goto done; + } + + /* When the block job completes, the BlockBackend reference will point to + * the old backing file. In order to avoid that the top image is already + * deleted, so we can still empty it afterwards, increment the reference + * counter here preemptively. */ + if (!drop) { + bdrv_ref(bs); + } + + run_block_job(bs->job, &local_err); + if (local_err) { + goto unref_backing; + } + + if (!drop && bs->drv->bdrv_make_empty) { + ret = bs->drv->bdrv_make_empty(bs); + if (ret) { + error_setg_errno(&local_err, -ret, "Could not empty %s", + filename); + goto unref_backing; + } + } + +unref_backing: + if (!drop) { + bdrv_unref(bs); + } + +done: + qemu_progress_end(); + + blk_unref(blk); + + if (local_err) { + error_report_err(local_err); + return 1; + } + + qprintf(quiet, "Image committed.\n"); + return 0; +} + +/* + * Returns true iff the first sector pointed to by 'buf' contains at least + * a non-NUL byte. + * + * 'pnum' is set to the number of sectors (including and immediately following + * the first one) that are known to be in the same allocated/unallocated state. + */ +static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum) +{ + bool is_zero; + int i; + + if (n <= 0) { + *pnum = 0; + return 0; + } + is_zero = buffer_is_zero(buf, 512); + for(i = 1; i < n; i++) { + buf += 512; + if (is_zero != buffer_is_zero(buf, 512)) { + break; + } + } + *pnum = i; + return !is_zero; +} + +/* + * Like is_allocated_sectors, but if the buffer starts with a used sector, + * up to 'min' consecutive sectors containing zeros are ignored. This avoids + * breaking up write requests for only small sparse areas. + */ +static int is_allocated_sectors_min(const uint8_t *buf, int n, int *pnum, + int min) +{ + int ret; + int num_checked, num_used; + + if (n < min) { + min = n; + } + + ret = is_allocated_sectors(buf, n, pnum); + if (!ret) { + return ret; + } + + num_used = *pnum; + buf += BDRV_SECTOR_SIZE * *pnum; + n -= *pnum; + num_checked = num_used; + + while (n > 0) { + ret = is_allocated_sectors(buf, n, pnum); + + buf += BDRV_SECTOR_SIZE * *pnum; + n -= *pnum; + num_checked += *pnum; + if (ret) { + num_used = num_checked; + } else if (*pnum >= min) { + break; + } + } + + *pnum = num_used; + return 1; +} + +/* + * Compares two buffers sector by sector. Returns 0 if the first sector of both + * buffers matches, non-zero otherwise. + * + * pnum is set to the number of sectors (including and immediately following + * the first one) that are known to have the same comparison result + */ +static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n, + int *pnum) +{ + bool res; + int i; + + if (n <= 0) { + *pnum = 0; + return 0; + } + + res = !!memcmp(buf1, buf2, 512); + for(i = 1; i < n; i++) { + buf1 += 512; + buf2 += 512; + + if (!!memcmp(buf1, buf2, 512) != res) { + break; + } + } + + *pnum = i; + return res; +} + +#define IO_BUF_SIZE (2 * 1024 * 1024) + +static int64_t sectors_to_bytes(int64_t sectors) +{ + return sectors << BDRV_SECTOR_BITS; +} + +static int64_t sectors_to_process(int64_t total, int64_t from) +{ + return MIN(total - from, IO_BUF_SIZE >> BDRV_SECTOR_BITS); +} + +/* + * Check if passed sectors are empty (not allocated or contain only 0 bytes) + * + * Returns 0 in case sectors are filled with 0, 1 if sectors contain non-zero + * data and negative value on error. + * + * @param blk: BlockBackend for the image + * @param sect_num: Number of first sector to check + * @param sect_count: Number of sectors to check + * @param filename: Name of disk file we are checking (logging purpose) + * @param buffer: Allocated buffer for storing read data + * @param quiet: Flag for quiet mode + */ +static int check_empty_sectors(BlockBackend *blk, int64_t sect_num, + int sect_count, const char *filename, + uint8_t *buffer, bool quiet) +{ + int pnum, ret = 0; + ret = blk_read(blk, sect_num, buffer, sect_count); + if (ret < 0) { + error_report("Error while reading offset %" PRId64 " of %s: %s", + sectors_to_bytes(sect_num), filename, strerror(-ret)); + return ret; + } + ret = is_allocated_sectors(buffer, sect_count, &pnum); + if (ret || pnum != sect_count) { + qprintf(quiet, "Content mismatch at offset %" PRId64 "!\n", + sectors_to_bytes(ret ? sect_num : sect_num + pnum)); + return 1; + } + + return 0; +} + +/* + * Compares two images. Exit codes: + * + * 0 - Images are identical + * 1 - Images differ + * >1 - Error occurred + */ +static int img_compare(int argc, char **argv) +{ + const char *fmt1 = NULL, *fmt2 = NULL, *cache, *filename1, *filename2; + BlockBackend *blk1, *blk2; + BlockDriverState *bs1, *bs2; + int64_t total_sectors1, total_sectors2; + uint8_t *buf1 = NULL, *buf2 = NULL; + int pnum1, pnum2; + int allocated1, allocated2; + int ret = 0; /* return value - 0 Ident, 1 Different, >1 Error */ + bool progress = false, quiet = false, strict = false; + int flags; + int64_t total_sectors; + int64_t sector_num = 0; + int64_t nb_sectors; + int c, pnum; + uint64_t progress_base; + + cache = BDRV_DEFAULT_CACHE; + for (;;) { + c = getopt(argc, argv, "hf:F:T:pqs"); + if (c == -1) { + break; + } + switch (c) { + case '?': + case 'h': + help(); + break; + case 'f': + fmt1 = optarg; + break; + case 'F': + fmt2 = optarg; + break; + case 'T': + cache = optarg; + break; + case 'p': + progress = true; + break; + case 'q': + quiet = true; + break; + case 's': + strict = true; + break; + } + } + + /* Progress is not shown in Quiet mode */ + if (quiet) { + progress = false; + } + + + if (optind != argc - 2) { + error_exit("Expecting two image file names"); + } + filename1 = argv[optind++]; + filename2 = argv[optind++]; + + /* Initialize before goto out */ + qemu_progress_init(progress, 2.0); + + flags = BDRV_O_FLAGS; + ret = bdrv_parse_cache_flags(cache, &flags); + if (ret < 0) { + error_report("Invalid source cache option: %s", cache); + ret = 2; + goto out3; + } + + blk1 = img_open("image_1", filename1, fmt1, flags, true, quiet); + if (!blk1) { + ret = 2; + goto out3; + } + bs1 = blk_bs(blk1); + + blk2 = img_open("image_2", filename2, fmt2, flags, true, quiet); + if (!blk2) { + ret = 2; + goto out2; + } + bs2 = blk_bs(blk2); + + buf1 = blk_blockalign(blk1, IO_BUF_SIZE); + buf2 = blk_blockalign(blk2, IO_BUF_SIZE); + total_sectors1 = blk_nb_sectors(blk1); + if (total_sectors1 < 0) { + error_report("Can't get size of %s: %s", + filename1, strerror(-total_sectors1)); + ret = 4; + goto out; + } + total_sectors2 = blk_nb_sectors(blk2); + if (total_sectors2 < 0) { + error_report("Can't get size of %s: %s", + filename2, strerror(-total_sectors2)); + ret = 4; + goto out; + } + total_sectors = MIN(total_sectors1, total_sectors2); + progress_base = MAX(total_sectors1, total_sectors2); + + qemu_progress_print(0, 100); + + if (strict && total_sectors1 != total_sectors2) { + ret = 1; + qprintf(quiet, "Strict mode: Image size mismatch!\n"); + goto out; + } + + for (;;) { + nb_sectors = sectors_to_process(total_sectors, sector_num); + if (nb_sectors <= 0) { + break; + } + allocated1 = bdrv_is_allocated_above(bs1, NULL, sector_num, nb_sectors, + &pnum1); + if (allocated1 < 0) { + ret = 3; + error_report("Sector allocation test failed for %s", filename1); + goto out; + } + + allocated2 = bdrv_is_allocated_above(bs2, NULL, sector_num, nb_sectors, + &pnum2); + if (allocated2 < 0) { + ret = 3; + error_report("Sector allocation test failed for %s", filename2); + goto out; + } + nb_sectors = MIN(pnum1, pnum2); + + if (allocated1 == allocated2) { + if (allocated1) { + ret = blk_read(blk1, sector_num, buf1, nb_sectors); + if (ret < 0) { + error_report("Error while reading offset %" PRId64 " of %s:" + " %s", sectors_to_bytes(sector_num), filename1, + strerror(-ret)); + ret = 4; + goto out; + } + ret = blk_read(blk2, sector_num, buf2, nb_sectors); + if (ret < 0) { + error_report("Error while reading offset %" PRId64 + " of %s: %s", sectors_to_bytes(sector_num), + filename2, strerror(-ret)); + ret = 4; + goto out; + } + ret = compare_sectors(buf1, buf2, nb_sectors, &pnum); + if (ret || pnum != nb_sectors) { + qprintf(quiet, "Content mismatch at offset %" PRId64 "!\n", + sectors_to_bytes( + ret ? sector_num : sector_num + pnum)); + ret = 1; + goto out; + } + } + } else { + if (strict) { + ret = 1; + qprintf(quiet, "Strict mode: Offset %" PRId64 + " allocation mismatch!\n", + sectors_to_bytes(sector_num)); + goto out; + } + + if (allocated1) { + ret = check_empty_sectors(blk1, sector_num, nb_sectors, + filename1, buf1, quiet); + } else { + ret = check_empty_sectors(blk2, sector_num, nb_sectors, + filename2, buf1, quiet); + } + if (ret) { + if (ret < 0) { + error_report("Error while reading offset %" PRId64 ": %s", + sectors_to_bytes(sector_num), strerror(-ret)); + ret = 4; + } + goto out; + } + } + sector_num += nb_sectors; + qemu_progress_print(((float) nb_sectors / progress_base)*100, 100); + } + + if (total_sectors1 != total_sectors2) { + BlockBackend *blk_over; + int64_t total_sectors_over; + const char *filename_over; + + qprintf(quiet, "Warning: Image size mismatch!\n"); + if (total_sectors1 > total_sectors2) { + total_sectors_over = total_sectors1; + blk_over = blk1; + filename_over = filename1; + } else { + total_sectors_over = total_sectors2; + blk_over = blk2; + filename_over = filename2; + } + + for (;;) { + nb_sectors = sectors_to_process(total_sectors_over, sector_num); + if (nb_sectors <= 0) { + break; + } + ret = bdrv_is_allocated_above(blk_bs(blk_over), NULL, sector_num, + nb_sectors, &pnum); + if (ret < 0) { + ret = 3; + error_report("Sector allocation test failed for %s", + filename_over); + goto out; + + } + nb_sectors = pnum; + if (ret) { + ret = check_empty_sectors(blk_over, sector_num, nb_sectors, + filename_over, buf1, quiet); + if (ret) { + if (ret < 0) { + error_report("Error while reading offset %" PRId64 + " of %s: %s", sectors_to_bytes(sector_num), + filename_over, strerror(-ret)); + ret = 4; + } + goto out; + } + } + sector_num += nb_sectors; + qemu_progress_print(((float) nb_sectors / progress_base)*100, 100); + } + } + + qprintf(quiet, "Images are identical.\n"); + ret = 0; + +out: + qemu_vfree(buf1); + qemu_vfree(buf2); + blk_unref(blk2); +out2: + blk_unref(blk1); +out3: + qemu_progress_end(); + return ret; +} + +enum ImgConvertBlockStatus { + BLK_DATA, + BLK_ZERO, + BLK_BACKING_FILE, +}; + +typedef struct ImgConvertState { + BlockBackend **src; + int64_t *src_sectors; + int src_cur, src_num; + int64_t src_cur_offset; + int64_t total_sectors; + int64_t allocated_sectors; + enum ImgConvertBlockStatus status; + int64_t sector_next_status; + BlockBackend *target; + bool has_zero_init; + bool compressed; + bool target_has_backing; + int min_sparse; + size_t cluster_sectors; + size_t buf_sectors; +} ImgConvertState; + +static void convert_select_part(ImgConvertState *s, int64_t sector_num) +{ + assert(sector_num >= s->src_cur_offset); + while (sector_num - s->src_cur_offset >= s->src_sectors[s->src_cur]) { + s->src_cur_offset += s->src_sectors[s->src_cur]; + s->src_cur++; + assert(s->src_cur < s->src_num); + } +} + +static int convert_iteration_sectors(ImgConvertState *s, int64_t sector_num) +{ + int64_t ret; + int n; + + convert_select_part(s, sector_num); + + assert(s->total_sectors > sector_num); + n = MIN(s->total_sectors - sector_num, BDRV_REQUEST_MAX_SECTORS); + + if (s->sector_next_status <= sector_num) { + ret = bdrv_get_block_status(blk_bs(s->src[s->src_cur]), + sector_num - s->src_cur_offset, + n, &n); + if (ret < 0) { + return ret; + } + + if (ret & BDRV_BLOCK_ZERO) { + s->status = BLK_ZERO; + } else if (ret & BDRV_BLOCK_DATA) { + s->status = BLK_DATA; + } else if (!s->target_has_backing) { + /* Without a target backing file we must copy over the contents of + * the backing file as well. */ + /* TODO Check block status of the backing file chain to avoid + * needlessly reading zeroes and limiting the iteration to the + * buffer size */ + s->status = BLK_DATA; + } else { + s->status = BLK_BACKING_FILE; + } + + s->sector_next_status = sector_num + n; + } + + n = MIN(n, s->sector_next_status - sector_num); + if (s->status == BLK_DATA) { + n = MIN(n, s->buf_sectors); + } + + /* We need to write complete clusters for compressed images, so if an + * unallocated area is shorter than that, we must consider the whole + * cluster allocated. */ + if (s->compressed) { + if (n < s->cluster_sectors) { + n = MIN(s->cluster_sectors, s->total_sectors - sector_num); + s->status = BLK_DATA; + } else { + n = QEMU_ALIGN_DOWN(n, s->cluster_sectors); + } + } + + return n; +} + +static int convert_read(ImgConvertState *s, int64_t sector_num, int nb_sectors, + uint8_t *buf) +{ + int n; + int ret; + + if (s->status == BLK_ZERO || s->status == BLK_BACKING_FILE) { + return 0; + } + + assert(nb_sectors <= s->buf_sectors); + while (nb_sectors > 0) { + BlockBackend *blk; + int64_t bs_sectors; + + /* In the case of compression with multiple source files, we can get a + * nb_sectors that spreads into the next part. So we must be able to + * read across multiple BDSes for one convert_read() call. */ + convert_select_part(s, sector_num); + blk = s->src[s->src_cur]; + bs_sectors = s->src_sectors[s->src_cur]; + + n = MIN(nb_sectors, bs_sectors - (sector_num - s->src_cur_offset)); + ret = blk_read(blk, sector_num - s->src_cur_offset, buf, n); + if (ret < 0) { + return ret; + } + + sector_num += n; + nb_sectors -= n; + buf += n * BDRV_SECTOR_SIZE; + } + + return 0; +} + +static int convert_write(ImgConvertState *s, int64_t sector_num, int nb_sectors, + const uint8_t *buf) +{ + int ret; + + while (nb_sectors > 0) { + int n = nb_sectors; + + switch (s->status) { + case BLK_BACKING_FILE: + /* If we have a backing file, leave clusters unallocated that are + * unallocated in the source image, so that the backing file is + * visible at the respective offset. */ + assert(s->target_has_backing); + break; + + case BLK_DATA: + /* We must always write compressed clusters as a whole, so don't + * try to find zeroed parts in the buffer. We can only save the + * write if the buffer is completely zeroed and we're allowed to + * keep the target sparse. */ + if (s->compressed) { + if (s->has_zero_init && s->min_sparse && + buffer_is_zero(buf, n * BDRV_SECTOR_SIZE)) + { + assert(!s->target_has_backing); + break; + } + + ret = blk_write_compressed(s->target, sector_num, buf, n); + if (ret < 0) { + return ret; + } + break; + } + + /* If there is real non-zero data or we're told to keep the target + * fully allocated (-S 0), we must write it. Otherwise we can treat + * it as zero sectors. */ + if (!s->min_sparse || + is_allocated_sectors_min(buf, n, &n, s->min_sparse)) + { + ret = blk_write(s->target, sector_num, buf, n); + if (ret < 0) { + return ret; + } + break; + } + /* fall-through */ + + case BLK_ZERO: + if (s->has_zero_init) { + break; + } + ret = blk_write_zeroes(s->target, sector_num, n, 0); + if (ret < 0) { + return ret; + } + break; + } + + sector_num += n; + nb_sectors -= n; + buf += n * BDRV_SECTOR_SIZE; + } + + return 0; +} + +static int convert_do_copy(ImgConvertState *s) +{ + uint8_t *buf = NULL; + int64_t sector_num, allocated_done; + int ret; + int n; + + /* Check whether we have zero initialisation or can get it efficiently */ + s->has_zero_init = s->min_sparse && !s->target_has_backing + ? bdrv_has_zero_init(blk_bs(s->target)) + : false; + + if (!s->has_zero_init && !s->target_has_backing && + bdrv_can_write_zeroes_with_unmap(blk_bs(s->target))) + { + ret = bdrv_make_zero(blk_bs(s->target), BDRV_REQ_MAY_UNMAP); + if (ret == 0) { + s->has_zero_init = true; + } + } + + /* Allocate buffer for copied data. For compressed images, only one cluster + * can be copied at a time. */ + if (s->compressed) { + if (s->cluster_sectors <= 0 || s->cluster_sectors > s->buf_sectors) { + error_report("invalid cluster size"); + ret = -EINVAL; + goto fail; + } + s->buf_sectors = s->cluster_sectors; + } + buf = blk_blockalign(s->target, s->buf_sectors * BDRV_SECTOR_SIZE); + + /* Calculate allocated sectors for progress */ + s->allocated_sectors = 0; + sector_num = 0; + while (sector_num < s->total_sectors) { + n = convert_iteration_sectors(s, sector_num); + if (n < 0) { + ret = n; + goto fail; + } + if (s->status == BLK_DATA) { + s->allocated_sectors += n; + } + sector_num += n; + } + + /* Do the copy */ + s->src_cur = 0; + s->src_cur_offset = 0; + s->sector_next_status = 0; + + sector_num = 0; + allocated_done = 0; + + while (sector_num < s->total_sectors) { + n = convert_iteration_sectors(s, sector_num); + if (n < 0) { + ret = n; + goto fail; + } + if (s->status == BLK_DATA) { + allocated_done += n; + qemu_progress_print(100.0 * allocated_done / s->allocated_sectors, + 0); + } + + ret = convert_read(s, sector_num, n, buf); + if (ret < 0) { + error_report("error while reading sector %" PRId64 + ": %s", sector_num, strerror(-ret)); + goto fail; + } + + ret = convert_write(s, sector_num, n, buf); + if (ret < 0) { + error_report("error while writing sector %" PRId64 + ": %s", sector_num, strerror(-ret)); + goto fail; + } + + sector_num += n; + } + + if (s->compressed) { + /* signal EOF to align */ + ret = blk_write_compressed(s->target, 0, NULL, 0); + if (ret < 0) { + goto fail; + } + } + + ret = 0; +fail: + qemu_vfree(buf); + return ret; +} + +static int img_convert(int argc, char **argv) +{ + int c, bs_n, bs_i, compress, cluster_sectors, skip_create; + int64_t ret = 0; + int progress = 0, flags, src_flags; + const char *fmt, *out_fmt, *cache, *src_cache, *out_baseimg, *out_filename; + BlockDriver *drv, *proto_drv; + BlockBackend **blk = NULL, *out_blk = NULL; + BlockDriverState **bs = NULL, *out_bs = NULL; + int64_t total_sectors; + int64_t *bs_sectors = NULL; + size_t bufsectors = IO_BUF_SIZE / BDRV_SECTOR_SIZE; + BlockDriverInfo bdi; + QemuOpts *opts = NULL; + QemuOptsList *create_opts = NULL; + const char *out_baseimg_param; + char *options = NULL; + const char *snapshot_name = NULL; + int min_sparse = 8; /* Need at least 4k of zeros for sparse detection */ + bool quiet = false; + Error *local_err = NULL; + QemuOpts *sn_opts = NULL; + ImgConvertState state; + + fmt = NULL; + out_fmt = "raw"; + cache = "unsafe"; + src_cache = BDRV_DEFAULT_CACHE; + out_baseimg = NULL; + compress = 0; + skip_create = 0; + for(;;) { + c = getopt(argc, argv, "hf:O:B:ce6o:s:l:S:pt:T:qn"); + if (c == -1) { + break; + } + switch(c) { + case '?': + case 'h': + help(); + break; + case 'f': + fmt = optarg; + break; + case 'O': + out_fmt = optarg; + break; + case 'B': + out_baseimg = optarg; + break; + case 'c': + compress = 1; + break; + case 'e': + error_report("option -e is deprecated, please use \'-o " + "encryption\' instead!"); + ret = -1; + goto fail_getopt; + case '6': + error_report("option -6 is deprecated, please use \'-o " + "compat6\' instead!"); + ret = -1; + goto fail_getopt; + case 'o': + if (!is_valid_option_list(optarg)) { + error_report("Invalid option list: %s", optarg); + ret = -1; + goto fail_getopt; + } + if (!options) { + options = g_strdup(optarg); + } else { + char *old_options = options; + options = g_strdup_printf("%s,%s", options, optarg); + g_free(old_options); + } + break; + case 's': + snapshot_name = optarg; + break; + case 'l': + if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { + sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, + optarg, false); + if (!sn_opts) { + error_report("Failed in parsing snapshot param '%s'", + optarg); + ret = -1; + goto fail_getopt; + } + } else { + snapshot_name = optarg; + } + break; + case 'S': + { + int64_t sval; + char *end; + sval = qemu_strtosz_suffix(optarg, &end, QEMU_STRTOSZ_DEFSUFFIX_B); + if (sval < 0 || *end) { + error_report("Invalid minimum zero buffer size for sparse output specified"); + ret = -1; + goto fail_getopt; + } + + min_sparse = sval / BDRV_SECTOR_SIZE; + break; + } + case 'p': + progress = 1; + break; + case 't': + cache = optarg; + break; + case 'T': + src_cache = optarg; + break; + case 'q': + quiet = true; + break; + case 'n': + skip_create = 1; + break; + } + } + + /* Initialize before goto out */ + if (quiet) { + progress = 0; + } + qemu_progress_init(progress, 1.0); + + + bs_n = argc - optind - 1; + out_filename = bs_n >= 1 ? argv[argc - 1] : NULL; + + if (options && has_help_option(options)) { + ret = print_block_option_help(out_filename, out_fmt); + goto out; + } + + if (bs_n < 1) { + error_exit("Must specify image file name"); + } + + + if (bs_n > 1 && out_baseimg) { + error_report("-B makes no sense when concatenating multiple input " + "images"); + ret = -1; + goto out; + } + + src_flags = BDRV_O_FLAGS; + ret = bdrv_parse_cache_flags(src_cache, &src_flags); + if (ret < 0) { + error_report("Invalid source cache option: %s", src_cache); + goto out; + } + + qemu_progress_print(0, 100); + + blk = g_new0(BlockBackend *, bs_n); + bs = g_new0(BlockDriverState *, bs_n); + bs_sectors = g_new(int64_t, bs_n); + + total_sectors = 0; + for (bs_i = 0; bs_i < bs_n; bs_i++) { + char *id = bs_n > 1 ? g_strdup_printf("source_%d", bs_i) + : g_strdup("source"); + blk[bs_i] = img_open(id, argv[optind + bs_i], fmt, src_flags, + true, quiet); + g_free(id); + if (!blk[bs_i]) { + ret = -1; + goto out; + } + bs[bs_i] = blk_bs(blk[bs_i]); + bs_sectors[bs_i] = blk_nb_sectors(blk[bs_i]); + if (bs_sectors[bs_i] < 0) { + error_report("Could not get size of %s: %s", + argv[optind + bs_i], strerror(-bs_sectors[bs_i])); + ret = -1; + goto out; + } + total_sectors += bs_sectors[bs_i]; + } + + if (sn_opts) { + ret = bdrv_snapshot_load_tmp(bs[0], + qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), + qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), + &local_err); + } else if (snapshot_name != NULL) { + if (bs_n > 1) { + error_report("No support for concatenating multiple snapshot"); + ret = -1; + goto out; + } + + bdrv_snapshot_load_tmp_by_id_or_name(bs[0], snapshot_name, &local_err); + } + if (local_err) { + error_report("Failed to load snapshot: %s", + error_get_pretty(local_err)); + error_free(local_err); + ret = -1; + goto out; + } + + /* Find driver and parse its options */ + drv = bdrv_find_format(out_fmt); + if (!drv) { + error_report("Unknown file format '%s'", out_fmt); + ret = -1; + goto out; + } + + proto_drv = bdrv_find_protocol(out_filename, true, &local_err); + if (!proto_drv) { + error_report_err(local_err); + ret = -1; + goto out; + } + + if (!skip_create) { + if (!drv->create_opts) { + error_report("Format driver '%s' does not support image creation", + drv->format_name); + ret = -1; + goto out; + } + + if (!proto_drv->create_opts) { + error_report("Protocol driver '%s' does not support image creation", + proto_drv->format_name); + ret = -1; + goto out; + } + + create_opts = qemu_opts_append(create_opts, drv->create_opts); + create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); + + opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); + if (options) { + qemu_opts_do_parse(opts, options, NULL, &local_err); + if (local_err) { + error_report_err(local_err); + ret = -1; + goto out; + } + } + + qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_sectors * 512, + &error_abort); + ret = add_old_style_options(out_fmt, opts, out_baseimg, NULL); + if (ret < 0) { + goto out; + } + } + + /* Get backing file name if -o backing_file was used */ + out_baseimg_param = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); + if (out_baseimg_param) { + out_baseimg = out_baseimg_param; + } + + /* Check if compression is supported */ + if (compress) { + bool encryption = + qemu_opt_get_bool(opts, BLOCK_OPT_ENCRYPT, false); + const char *preallocation = + qemu_opt_get(opts, BLOCK_OPT_PREALLOC); + + if (!drv->bdrv_write_compressed) { + error_report("Compression not supported for this file format"); + ret = -1; + goto out; + } + + if (encryption) { + error_report("Compression and encryption not supported at " + "the same time"); + ret = -1; + goto out; + } + + if (preallocation + && strcmp(preallocation, "off")) + { + error_report("Compression and preallocation not supported at " + "the same time"); + ret = -1; + goto out; + } + } + + if (!skip_create) { + /* Create the new image */ + ret = bdrv_create(drv, out_filename, opts, &local_err); + if (ret < 0) { + error_report("%s: error while converting %s: %s", + out_filename, out_fmt, error_get_pretty(local_err)); + error_free(local_err); + goto out; + } + } + + flags = min_sparse ? (BDRV_O_RDWR | BDRV_O_UNMAP) : BDRV_O_RDWR; + ret = bdrv_parse_cache_flags(cache, &flags); + if (ret < 0) { + error_report("Invalid cache option: %s", cache); + goto out; + } + + out_blk = img_open("target", out_filename, out_fmt, flags, true, quiet); + if (!out_blk) { + ret = -1; + goto out; + } + out_bs = blk_bs(out_blk); + + /* increase bufsectors from the default 4096 (2M) if opt_transfer_length + * or discard_alignment of the out_bs is greater. Limit to 32768 (16MB) + * as maximum. */ + bufsectors = MIN(32768, + MAX(bufsectors, MAX(out_bs->bl.opt_transfer_length, + out_bs->bl.discard_alignment)) + ); + + if (skip_create) { + int64_t output_sectors = blk_nb_sectors(out_blk); + if (output_sectors < 0) { + error_report("unable to get output image length: %s", + strerror(-output_sectors)); + ret = -1; + goto out; + } else if (output_sectors < total_sectors) { + error_report("output file is smaller than input file"); + ret = -1; + goto out; + } + } + + cluster_sectors = 0; + ret = bdrv_get_info(out_bs, &bdi); + if (ret < 0) { + if (compress) { + error_report("could not get block driver info"); + goto out; + } + } else { + compress = compress || bdi.needs_compressed_writes; + cluster_sectors = bdi.cluster_size / BDRV_SECTOR_SIZE; + } + + state = (ImgConvertState) { + .src = blk, + .src_sectors = bs_sectors, + .src_num = bs_n, + .total_sectors = total_sectors, + .target = out_blk, + .compressed = compress, + .target_has_backing = (bool) out_baseimg, + .min_sparse = min_sparse, + .cluster_sectors = cluster_sectors, + .buf_sectors = bufsectors, + }; + ret = convert_do_copy(&state); + +out: + if (!ret) { + qemu_progress_print(100, 0); + } + qemu_progress_end(); + qemu_opts_del(opts); + qemu_opts_free(create_opts); + qemu_opts_del(sn_opts); + blk_unref(out_blk); + g_free(bs); + if (blk) { + for (bs_i = 0; bs_i < bs_n; bs_i++) { + blk_unref(blk[bs_i]); + } + g_free(blk); + } + g_free(bs_sectors); +fail_getopt: + g_free(options); + + if (ret) { + return 1; + } + return 0; +} + + +static void dump_snapshots(BlockDriverState *bs) +{ + QEMUSnapshotInfo *sn_tab, *sn; + int nb_sns, i; + + nb_sns = bdrv_snapshot_list(bs, &sn_tab); + if (nb_sns <= 0) + return; + printf("Snapshot list:\n"); + bdrv_snapshot_dump(fprintf, stdout, NULL); + printf("\n"); + for(i = 0; i < nb_sns; i++) { + sn = &sn_tab[i]; + bdrv_snapshot_dump(fprintf, stdout, sn); + printf("\n"); + } + g_free(sn_tab); +} + +static void dump_json_image_info_list(ImageInfoList *list) +{ + Error *local_err = NULL; + QString *str; + QmpOutputVisitor *ov = qmp_output_visitor_new(); + QObject *obj; + visit_type_ImageInfoList(qmp_output_get_visitor(ov), + &list, NULL, &local_err); + obj = qmp_output_get_qobject(ov); + str = qobject_to_json_pretty(obj); + assert(str != NULL); + printf("%s\n", qstring_get_str(str)); + qobject_decref(obj); + qmp_output_visitor_cleanup(ov); + QDECREF(str); +} + +static void dump_json_image_info(ImageInfo *info) +{ + Error *local_err = NULL; + QString *str; + QmpOutputVisitor *ov = qmp_output_visitor_new(); + QObject *obj; + visit_type_ImageInfo(qmp_output_get_visitor(ov), + &info, NULL, &local_err); + obj = qmp_output_get_qobject(ov); + str = qobject_to_json_pretty(obj); + assert(str != NULL); + printf("%s\n", qstring_get_str(str)); + qobject_decref(obj); + qmp_output_visitor_cleanup(ov); + QDECREF(str); +} + +static void dump_human_image_info_list(ImageInfoList *list) +{ + ImageInfoList *elem; + bool delim = false; + + for (elem = list; elem; elem = elem->next) { + if (delim) { + printf("\n"); + } + delim = true; + + bdrv_image_info_dump(fprintf, stdout, elem->value); + } +} + +static gboolean str_equal_func(gconstpointer a, gconstpointer b) +{ + return strcmp(a, b) == 0; +} + +/** + * Open an image file chain and return an ImageInfoList + * + * @filename: topmost image filename + * @fmt: topmost image format (may be NULL to autodetect) + * @chain: true - enumerate entire backing file chain + * false - only topmost image file + * + * Returns a list of ImageInfo objects or NULL if there was an error opening an + * image file. If there was an error a message will have been printed to + * stderr. + */ +static ImageInfoList *collect_image_info_list(const char *filename, + const char *fmt, + bool chain) +{ + ImageInfoList *head = NULL; + ImageInfoList **last = &head; + GHashTable *filenames; + Error *err = NULL; + + filenames = g_hash_table_new_full(g_str_hash, str_equal_func, NULL, NULL); + + while (filename) { + BlockBackend *blk; + BlockDriverState *bs; + ImageInfo *info; + ImageInfoList *elem; + + if (g_hash_table_lookup_extended(filenames, filename, NULL, NULL)) { + error_report("Backing file '%s' creates an infinite loop.", + filename); + goto err; + } + g_hash_table_insert(filenames, (gpointer)filename, NULL); + + blk = img_open("image", filename, fmt, + BDRV_O_FLAGS | BDRV_O_NO_BACKING, false, false); + if (!blk) { + goto err; + } + bs = blk_bs(blk); + + bdrv_query_image_info(bs, &info, &err); + if (err) { + error_report_err(err); + blk_unref(blk); + goto err; + } + + elem = g_new0(ImageInfoList, 1); + elem->value = info; + *last = elem; + last = &elem->next; + + blk_unref(blk); + + filename = fmt = NULL; + if (chain) { + if (info->has_full_backing_filename) { + filename = info->full_backing_filename; + } else if (info->has_backing_filename) { + filename = info->backing_filename; + } + if (info->has_backing_filename_format) { + fmt = info->backing_filename_format; + } + } + } + g_hash_table_destroy(filenames); + return head; + +err: + qapi_free_ImageInfoList(head); + g_hash_table_destroy(filenames); + return NULL; +} + +static int img_info(int argc, char **argv) +{ + int c; + OutputFormat output_format = OFORMAT_HUMAN; + bool chain = false; + const char *filename, *fmt, *output; + ImageInfoList *list; + + fmt = NULL; + output = NULL; + for(;;) { + int option_index = 0; + static const struct option long_options[] = { + {"help", no_argument, 0, 'h'}, + {"format", required_argument, 0, 'f'}, + {"output", required_argument, 0, OPTION_OUTPUT}, + {"backing-chain", no_argument, 0, OPTION_BACKING_CHAIN}, + {0, 0, 0, 0} + }; + c = getopt_long(argc, argv, "f:h", + long_options, &option_index); + if (c == -1) { + break; + } + switch(c) { + case '?': + case 'h': + help(); + break; + case 'f': + fmt = optarg; + break; + case OPTION_OUTPUT: + output = optarg; + break; + case OPTION_BACKING_CHAIN: + chain = true; + break; + } + } + if (optind != argc - 1) { + error_exit("Expecting one image file name"); + } + filename = argv[optind++]; + + if (output && !strcmp(output, "json")) { + output_format = OFORMAT_JSON; + } else if (output && !strcmp(output, "human")) { + output_format = OFORMAT_HUMAN; + } else if (output) { + error_report("--output must be used with human or json as argument."); + return 1; + } + + list = collect_image_info_list(filename, fmt, chain); + if (!list) { + return 1; + } + + switch (output_format) { + case OFORMAT_HUMAN: + dump_human_image_info_list(list); + break; + case OFORMAT_JSON: + if (chain) { + dump_json_image_info_list(list); + } else { + dump_json_image_info(list->value); + } + break; + } + + qapi_free_ImageInfoList(list); + return 0; +} + + +typedef struct MapEntry { + int flags; + int depth; + int64_t start; + int64_t length; + int64_t offset; + BlockDriverState *bs; +} MapEntry; + +static void dump_map_entry(OutputFormat output_format, MapEntry *e, + MapEntry *next) +{ + switch (output_format) { + case OFORMAT_HUMAN: + if ((e->flags & BDRV_BLOCK_DATA) && + !(e->flags & BDRV_BLOCK_OFFSET_VALID)) { + error_report("File contains external, encrypted or compressed clusters."); + exit(1); + } + if ((e->flags & (BDRV_BLOCK_DATA|BDRV_BLOCK_ZERO)) == BDRV_BLOCK_DATA) { + printf("%#-16"PRIx64"%#-16"PRIx64"%#-16"PRIx64"%s\n", + e->start, e->length, e->offset, e->bs->filename); + } + /* This format ignores the distinction between 0, ZERO and ZERO|DATA. + * Modify the flags here to allow more coalescing. + */ + if (next && + (next->flags & (BDRV_BLOCK_DATA|BDRV_BLOCK_ZERO)) != BDRV_BLOCK_DATA) { + next->flags &= ~BDRV_BLOCK_DATA; + next->flags |= BDRV_BLOCK_ZERO; + } + break; + case OFORMAT_JSON: + printf("%s{ \"start\": %"PRId64", \"length\": %"PRId64", \"depth\": %d," + " \"zero\": %s, \"data\": %s", + (e->start == 0 ? "[" : ",\n"), + e->start, e->length, e->depth, + (e->flags & BDRV_BLOCK_ZERO) ? "true" : "false", + (e->flags & BDRV_BLOCK_DATA) ? "true" : "false"); + if (e->flags & BDRV_BLOCK_OFFSET_VALID) { + printf(", \"offset\": %"PRId64"", e->offset); + } + putchar('}'); + + if (!next) { + printf("]\n"); + } + break; + } +} + +static int get_block_status(BlockDriverState *bs, int64_t sector_num, + int nb_sectors, MapEntry *e) +{ + int64_t ret; + int depth; + + /* As an optimization, we could cache the current range of unallocated + * clusters in each file of the chain, and avoid querying the same + * range repeatedly. + */ + + depth = 0; + for (;;) { + ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &nb_sectors); + if (ret < 0) { + return ret; + } + assert(nb_sectors); + if (ret & (BDRV_BLOCK_ZERO|BDRV_BLOCK_DATA)) { + break; + } + bs = backing_bs(bs); + if (bs == NULL) { + ret = 0; + break; + } + + depth++; + } + + e->start = sector_num * BDRV_SECTOR_SIZE; + e->length = nb_sectors * BDRV_SECTOR_SIZE; + e->flags = ret & ~BDRV_BLOCK_OFFSET_MASK; + e->offset = ret & BDRV_BLOCK_OFFSET_MASK; + e->depth = depth; + e->bs = bs; + return 0; +} + +static int img_map(int argc, char **argv) +{ + int c; + OutputFormat output_format = OFORMAT_HUMAN; + BlockBackend *blk; + BlockDriverState *bs; + const char *filename, *fmt, *output; + int64_t length; + MapEntry curr = { .length = 0 }, next; + int ret = 0; + + fmt = NULL; + output = NULL; + for (;;) { + int option_index = 0; + static const struct option long_options[] = { + {"help", no_argument, 0, 'h'}, + {"format", required_argument, 0, 'f'}, + {"output", required_argument, 0, OPTION_OUTPUT}, + {0, 0, 0, 0} + }; + c = getopt_long(argc, argv, "f:h", + long_options, &option_index); + if (c == -1) { + break; + } + switch (c) { + case '?': + case 'h': + help(); + break; + case 'f': + fmt = optarg; + break; + case OPTION_OUTPUT: + output = optarg; + break; + } + } + if (optind != argc - 1) { + error_exit("Expecting one image file name"); + } + filename = argv[optind]; + + if (output && !strcmp(output, "json")) { + output_format = OFORMAT_JSON; + } else if (output && !strcmp(output, "human")) { + output_format = OFORMAT_HUMAN; + } else if (output) { + error_report("--output must be used with human or json as argument."); + return 1; + } + + blk = img_open("image", filename, fmt, BDRV_O_FLAGS, true, false); + if (!blk) { + return 1; + } + bs = blk_bs(blk); + + if (output_format == OFORMAT_HUMAN) { + printf("%-16s%-16s%-16s%s\n", "Offset", "Length", "Mapped to", "File"); + } + + length = blk_getlength(blk); + while (curr.start + curr.length < length) { + int64_t nsectors_left; + int64_t sector_num; + int n; + + sector_num = (curr.start + curr.length) >> BDRV_SECTOR_BITS; + + /* Probe up to 1 GiB at a time. */ + nsectors_left = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE) - sector_num; + n = MIN(1 << (30 - BDRV_SECTOR_BITS), nsectors_left); + ret = get_block_status(bs, sector_num, n, &next); + + if (ret < 0) { + error_report("Could not read file metadata: %s", strerror(-ret)); + goto out; + } + + if (curr.length != 0 && curr.flags == next.flags && + curr.depth == next.depth && + ((curr.flags & BDRV_BLOCK_OFFSET_VALID) == 0 || + curr.offset + curr.length == next.offset)) { + curr.length += next.length; + continue; + } + + if (curr.length > 0) { + dump_map_entry(output_format, &curr, &next); + } + curr = next; + } + + dump_map_entry(output_format, &curr, NULL); + +out: + blk_unref(blk); + return ret < 0; +} + +#define SNAPSHOT_LIST 1 +#define SNAPSHOT_CREATE 2 +#define SNAPSHOT_APPLY 3 +#define SNAPSHOT_DELETE 4 + +static int img_snapshot(int argc, char **argv) +{ + BlockBackend *blk; + BlockDriverState *bs; + QEMUSnapshotInfo sn; + char *filename, *snapshot_name = NULL; + int c, ret = 0, bdrv_oflags; + int action = 0; + qemu_timeval tv; + bool quiet = false; + Error *err = NULL; + + bdrv_oflags = BDRV_O_FLAGS | BDRV_O_RDWR; + /* Parse commandline parameters */ + for(;;) { + c = getopt(argc, argv, "la:c:d:hq"); + if (c == -1) { + break; + } + switch(c) { + case '?': + case 'h': + help(); + return 0; + case 'l': + if (action) { + error_exit("Cannot mix '-l', '-a', '-c', '-d'"); + return 0; + } + action = SNAPSHOT_LIST; + bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */ + break; + case 'a': + if (action) { + error_exit("Cannot mix '-l', '-a', '-c', '-d'"); + return 0; + } + action = SNAPSHOT_APPLY; + snapshot_name = optarg; + break; + case 'c': + if (action) { + error_exit("Cannot mix '-l', '-a', '-c', '-d'"); + return 0; + } + action = SNAPSHOT_CREATE; + snapshot_name = optarg; + break; + case 'd': + if (action) { + error_exit("Cannot mix '-l', '-a', '-c', '-d'"); + return 0; + } + action = SNAPSHOT_DELETE; + snapshot_name = optarg; + break; + case 'q': + quiet = true; + break; + } + } + + if (optind != argc - 1) { + error_exit("Expecting one image file name"); + } + filename = argv[optind++]; + + /* Open the image */ + blk = img_open("image", filename, NULL, bdrv_oflags, true, quiet); + if (!blk) { + return 1; + } + bs = blk_bs(blk); + + /* Perform the requested action */ + switch(action) { + case SNAPSHOT_LIST: + dump_snapshots(bs); + break; + + case SNAPSHOT_CREATE: + memset(&sn, 0, sizeof(sn)); + pstrcpy(sn.name, sizeof(sn.name), snapshot_name); + + qemu_gettimeofday(&tv); + sn.date_sec = tv.tv_sec; + sn.date_nsec = tv.tv_usec * 1000; + + ret = bdrv_snapshot_create(bs, &sn); + if (ret) { + error_report("Could not create snapshot '%s': %d (%s)", + snapshot_name, ret, strerror(-ret)); + } + break; + + case SNAPSHOT_APPLY: + ret = bdrv_snapshot_goto(bs, snapshot_name); + if (ret) { + error_report("Could not apply snapshot '%s': %d (%s)", + snapshot_name, ret, strerror(-ret)); + } + break; + + case SNAPSHOT_DELETE: + bdrv_snapshot_delete_by_id_or_name(bs, snapshot_name, &err); + if (err) { + error_report("Could not delete snapshot '%s': (%s)", + snapshot_name, error_get_pretty(err)); + error_free(err); + ret = 1; + } + break; + } + + /* Cleanup */ + blk_unref(blk); + if (ret) { + return 1; + } + return 0; +} + +static int img_rebase(int argc, char **argv) +{ + BlockBackend *blk = NULL, *blk_old_backing = NULL, *blk_new_backing = NULL; + BlockDriverState *bs = NULL; + char *filename; + const char *fmt, *cache, *src_cache, *out_basefmt, *out_baseimg; + int c, flags, src_flags, ret; + int unsafe = 0; + int progress = 0; + bool quiet = false; + Error *local_err = NULL; + + /* Parse commandline parameters */ + fmt = NULL; + cache = BDRV_DEFAULT_CACHE; + src_cache = BDRV_DEFAULT_CACHE; + out_baseimg = NULL; + out_basefmt = NULL; + for(;;) { + c = getopt(argc, argv, "hf:F:b:upt:T:q"); + if (c == -1) { + break; + } + switch(c) { + case '?': + case 'h': + help(); + return 0; + case 'f': + fmt = optarg; + break; + case 'F': + out_basefmt = optarg; + break; + case 'b': + out_baseimg = optarg; + break; + case 'u': + unsafe = 1; + break; + case 'p': + progress = 1; + break; + case 't': + cache = optarg; + break; + case 'T': + src_cache = optarg; + break; + case 'q': + quiet = true; + break; + } + } + + if (quiet) { + progress = 0; + } + + if (optind != argc - 1) { + error_exit("Expecting one image file name"); + } + if (!unsafe && !out_baseimg) { + error_exit("Must specify backing file (-b) or use unsafe mode (-u)"); + } + filename = argv[optind++]; + + qemu_progress_init(progress, 2.0); + qemu_progress_print(0, 100); + + flags = BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0); + ret = bdrv_parse_cache_flags(cache, &flags); + if (ret < 0) { + error_report("Invalid cache option: %s", cache); + goto out; + } + + src_flags = BDRV_O_FLAGS; + ret = bdrv_parse_cache_flags(src_cache, &src_flags); + if (ret < 0) { + error_report("Invalid source cache option: %s", src_cache); + goto out; + } + + /* + * Open the images. + * + * Ignore the old backing file for unsafe rebase in case we want to correct + * the reference to a renamed or moved backing file. + */ + blk = img_open("image", filename, fmt, flags, true, quiet); + if (!blk) { + ret = -1; + goto out; + } + bs = blk_bs(blk); + + if (out_basefmt != NULL) { + if (bdrv_find_format(out_basefmt) == NULL) { + error_report("Invalid format name: '%s'", out_basefmt); + ret = -1; + goto out; + } + } + + /* For safe rebasing we need to compare old and new backing file */ + if (!unsafe) { + char backing_name[PATH_MAX]; + QDict *options = NULL; + + if (bs->backing_format[0] != '\0') { + options = qdict_new(); + qdict_put(options, "driver", qstring_from_str(bs->backing_format)); + } + + bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name)); + blk_old_backing = blk_new_open("old_backing", backing_name, NULL, + options, src_flags, &local_err); + if (!blk_old_backing) { + error_report("Could not open old backing file '%s': %s", + backing_name, error_get_pretty(local_err)); + error_free(local_err); + goto out; + } + + if (out_baseimg[0]) { + if (out_basefmt) { + options = qdict_new(); + qdict_put(options, "driver", qstring_from_str(out_basefmt)); + } else { + options = NULL; + } + + blk_new_backing = blk_new_open("new_backing", out_baseimg, NULL, + options, src_flags, &local_err); + if (!blk_new_backing) { + error_report("Could not open new backing file '%s': %s", + out_baseimg, error_get_pretty(local_err)); + error_free(local_err); + goto out; + } + } + } + + /* + * Check each unallocated cluster in the COW file. If it is unallocated, + * accesses go to the backing file. We must therefore compare this cluster + * in the old and new backing file, and if they differ we need to copy it + * from the old backing file into the COW file. + * + * If qemu-img crashes during this step, no harm is done. The content of + * the image is the same as the original one at any time. + */ + if (!unsafe) { + int64_t num_sectors; + int64_t old_backing_num_sectors; + int64_t new_backing_num_sectors = 0; + uint64_t sector; + int n; + uint8_t * buf_old; + uint8_t * buf_new; + float local_progress = 0; + + buf_old = blk_blockalign(blk, IO_BUF_SIZE); + buf_new = blk_blockalign(blk, IO_BUF_SIZE); + + num_sectors = blk_nb_sectors(blk); + if (num_sectors < 0) { + error_report("Could not get size of '%s': %s", + filename, strerror(-num_sectors)); + ret = -1; + goto out; + } + old_backing_num_sectors = blk_nb_sectors(blk_old_backing); + if (old_backing_num_sectors < 0) { + char backing_name[PATH_MAX]; + + bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name)); + error_report("Could not get size of '%s': %s", + backing_name, strerror(-old_backing_num_sectors)); + ret = -1; + goto out; + } + if (blk_new_backing) { + new_backing_num_sectors = blk_nb_sectors(blk_new_backing); + if (new_backing_num_sectors < 0) { + error_report("Could not get size of '%s': %s", + out_baseimg, strerror(-new_backing_num_sectors)); + ret = -1; + goto out; + } + } + + if (num_sectors != 0) { + local_progress = (float)100 / + (num_sectors / MIN(num_sectors, IO_BUF_SIZE / 512)); + } + + for (sector = 0; sector < num_sectors; sector += n) { + + /* How many sectors can we handle with the next read? */ + if (sector + (IO_BUF_SIZE / 512) <= num_sectors) { + n = (IO_BUF_SIZE / 512); + } else { + n = num_sectors - sector; + } + + /* If the cluster is allocated, we don't need to take action */ + ret = bdrv_is_allocated(bs, sector, n, &n); + if (ret < 0) { + error_report("error while reading image metadata: %s", + strerror(-ret)); + goto out; + } + if (ret) { + continue; + } + + /* + * Read old and new backing file and take into consideration that + * backing files may be smaller than the COW image. + */ + if (sector >= old_backing_num_sectors) { + memset(buf_old, 0, n * BDRV_SECTOR_SIZE); + } else { + if (sector + n > old_backing_num_sectors) { + n = old_backing_num_sectors - sector; + } + + ret = blk_read(blk_old_backing, sector, buf_old, n); + if (ret < 0) { + error_report("error while reading from old backing file"); + goto out; + } + } + + if (sector >= new_backing_num_sectors || !blk_new_backing) { + memset(buf_new, 0, n * BDRV_SECTOR_SIZE); + } else { + if (sector + n > new_backing_num_sectors) { + n = new_backing_num_sectors - sector; + } + + ret = blk_read(blk_new_backing, sector, buf_new, n); + if (ret < 0) { + error_report("error while reading from new backing file"); + goto out; + } + } + + /* If they differ, we need to write to the COW file */ + uint64_t written = 0; + + while (written < n) { + int pnum; + + if (compare_sectors(buf_old + written * 512, + buf_new + written * 512, n - written, &pnum)) + { + ret = blk_write(blk, sector + written, + buf_old + written * 512, pnum); + if (ret < 0) { + error_report("Error while writing to COW image: %s", + strerror(-ret)); + goto out; + } + } + + written += pnum; + } + qemu_progress_print(local_progress, 100); + } + + qemu_vfree(buf_old); + qemu_vfree(buf_new); + } + + /* + * Change the backing file. All clusters that are different from the old + * backing file are overwritten in the COW file now, so the visible content + * doesn't change when we switch the backing file. + */ + if (out_baseimg && *out_baseimg) { + ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); + } else { + ret = bdrv_change_backing_file(bs, NULL, NULL); + } + + if (ret == -ENOSPC) { + error_report("Could not change the backing file to '%s': No " + "space left in the file header", out_baseimg); + } else if (ret < 0) { + error_report("Could not change the backing file to '%s': %s", + out_baseimg, strerror(-ret)); + } + + qemu_progress_print(100, 0); + /* + * TODO At this point it is possible to check if any clusters that are + * allocated in the COW file are the same in the backing file. If so, they + * could be dropped from the COW file. Don't do this before switching the + * backing file, in case of a crash this would lead to corruption. + */ +out: + qemu_progress_end(); + /* Cleanup */ + if (!unsafe) { + blk_unref(blk_old_backing); + blk_unref(blk_new_backing); + } + + blk_unref(blk); + if (ret) { + return 1; + } + return 0; +} + +static int img_resize(int argc, char **argv) +{ + Error *err = NULL; + int c, ret, relative; + const char *filename, *fmt, *size; + int64_t n, total_size; + bool quiet = false; + BlockBackend *blk = NULL; + QemuOpts *param; + static QemuOptsList resize_options = { + .name = "resize_options", + .head = QTAILQ_HEAD_INITIALIZER(resize_options.head), + .desc = { + { + .name = BLOCK_OPT_SIZE, + .type = QEMU_OPT_SIZE, + .help = "Virtual disk size" + }, { + /* end of list */ + } + }, + }; + + /* Remove size from argv manually so that negative numbers are not treated + * as options by getopt. */ + if (argc < 3) { + error_exit("Not enough arguments"); + return 1; + } + + size = argv[--argc]; + + /* Parse getopt arguments */ + fmt = NULL; + for(;;) { + c = getopt(argc, argv, "f:hq"); + if (c == -1) { + break; + } + switch(c) { + case '?': + case 'h': + help(); + break; + case 'f': + fmt = optarg; + break; + case 'q': + quiet = true; + break; + } + } + if (optind != argc - 1) { + error_exit("Expecting one image file name"); + } + filename = argv[optind++]; + + /* Choose grow, shrink, or absolute resize mode */ + switch (size[0]) { + case '+': + relative = 1; + size++; + break; + case '-': + relative = -1; + size++; + break; + default: + relative = 0; + break; + } + + /* Parse size */ + param = qemu_opts_create(&resize_options, NULL, 0, &error_abort); + qemu_opt_set(param, BLOCK_OPT_SIZE, size, &err); + if (err) { + error_report_err(err); + ret = -1; + qemu_opts_del(param); + goto out; + } + n = qemu_opt_get_size(param, BLOCK_OPT_SIZE, 0); + qemu_opts_del(param); + + blk = img_open("image", filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR, + true, quiet); + if (!blk) { + ret = -1; + goto out; + } + + if (relative) { + total_size = blk_getlength(blk) + n * relative; + } else { + total_size = n; + } + if (total_size <= 0) { + error_report("New image size must be positive"); + ret = -1; + goto out; + } + + ret = blk_truncate(blk, total_size); + switch (ret) { + case 0: + qprintf(quiet, "Image resized.\n"); + break; + case -ENOTSUP: + error_report("This image does not support resize"); + break; + case -EACCES: + error_report("Image is read-only"); + break; + default: + error_report("Error resizing image (%d)", -ret); + break; + } +out: + blk_unref(blk); + if (ret) { + return 1; + } + return 0; +} + +static void amend_status_cb(BlockDriverState *bs, + int64_t offset, int64_t total_work_size) +{ + qemu_progress_print(100.f * offset / total_work_size, 0); +} + +static int img_amend(int argc, char **argv) +{ + Error *err = NULL; + int c, ret = 0; + char *options = NULL; + QemuOptsList *create_opts = NULL; + QemuOpts *opts = NULL; + const char *fmt = NULL, *filename, *cache; + int flags; + bool quiet = false, progress = false; + BlockBackend *blk = NULL; + BlockDriverState *bs = NULL; + + cache = BDRV_DEFAULT_CACHE; + for (;;) { + c = getopt(argc, argv, "ho:f:t:pq"); + if (c == -1) { + break; + } + + switch (c) { + case 'h': + case '?': + help(); + break; + case 'o': + if (!is_valid_option_list(optarg)) { + error_report("Invalid option list: %s", optarg); + ret = -1; + goto out_no_progress; + } + if (!options) { + options = g_strdup(optarg); + } else { + char *old_options = options; + options = g_strdup_printf("%s,%s", options, optarg); + g_free(old_options); + } + break; + case 'f': + fmt = optarg; + break; + case 't': + cache = optarg; + break; + case 'p': + progress = true; + break; + case 'q': + quiet = true; + break; + } + } + + if (!options) { + error_exit("Must specify options (-o)"); + } + + if (quiet) { + progress = false; + } + qemu_progress_init(progress, 1.0); + + filename = (optind == argc - 1) ? argv[argc - 1] : NULL; + if (fmt && has_help_option(options)) { + /* If a format is explicitly specified (and possibly no filename is + * given), print option help here */ + ret = print_block_option_help(filename, fmt); + goto out; + } + + if (optind != argc - 1) { + error_report("Expecting one image file name"); + ret = -1; + goto out; + } + + flags = BDRV_O_FLAGS | BDRV_O_RDWR; + ret = bdrv_parse_cache_flags(cache, &flags); + if (ret < 0) { + error_report("Invalid cache option: %s", cache); + goto out; + } + + blk = img_open("image", filename, fmt, flags, true, quiet); + if (!blk) { + ret = -1; + goto out; + } + bs = blk_bs(blk); + + fmt = bs->drv->format_name; + + if (has_help_option(options)) { + /* If the format was auto-detected, print option help here */ + ret = print_block_option_help(filename, fmt); + goto out; + } + + if (!bs->drv->create_opts) { + error_report("Format driver '%s' does not support any options to amend", + fmt); + ret = -1; + goto out; + } + + create_opts = qemu_opts_append(create_opts, bs->drv->create_opts); + opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); + if (options) { + qemu_opts_do_parse(opts, options, NULL, &err); + if (err) { + error_report_err(err); + ret = -1; + goto out; + } + } + + /* In case the driver does not call amend_status_cb() */ + qemu_progress_print(0.f, 0); + ret = bdrv_amend_options(bs, opts, &amend_status_cb); + qemu_progress_print(100.f, 0); + if (ret < 0) { + error_report("Error while amending options: %s", strerror(-ret)); + goto out; + } + +out: + qemu_progress_end(); + +out_no_progress: + blk_unref(blk); + qemu_opts_del(opts); + qemu_opts_free(create_opts); + g_free(options); + + if (ret) { + return 1; + } + return 0; +} + +static const img_cmd_t img_cmds[] = { +#define DEF(option, callback, arg_string) \ + { option, callback }, +#include "qemu-img-cmds.h" +#undef DEF +#undef GEN_DOCS + { NULL, NULL, }, +}; + +int main(int argc, char **argv) +{ + const img_cmd_t *cmd; + const char *cmdname; + Error *local_error = NULL; + int c; + static const struct option long_options[] = { + {"help", no_argument, 0, 'h'}, + {"version", no_argument, 0, 'v'}, + {0, 0, 0, 0} + }; + +#ifdef CONFIG_POSIX + signal(SIGPIPE, SIG_IGN); +#endif + + error_set_progname(argv[0]); + qemu_init_exec_dir(argv[0]); + + if (qemu_init_main_loop(&local_error)) { + error_report_err(local_error); + exit(EXIT_FAILURE); + } + + bdrv_init(); + if (argc < 2) { + error_exit("Not enough arguments"); + } + cmdname = argv[1]; + + /* find the command */ + for (cmd = img_cmds; cmd->name != NULL; cmd++) { + if (!strcmp(cmdname, cmd->name)) { + return cmd->handler(argc - 1, argv + 1); + } + } + + c = getopt_long(argc, argv, "h", long_options, NULL); + + if (c == 'h') { + help(); + } + if (c == 'v') { + printf(QEMU_IMG_VERSION); + return 0; + } + + /* not found */ + error_exit("Command not found: %s", cmdname); +} |
