| /* |
| * 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/qjson.h" |
| #include "qemu-common.h" |
| #include "qemu/option.h" |
| #include "qemu/error-report.h" |
| #include "qemu/osdep.h" |
| #include "sysemu/sysemu.h" |
| #include "block/block_int.h" |
| #include "block/qapi.h" |
| #include <getopt.h> |
| #include <stdio.h> |
| #include <stdarg.h> |
| |
| #ifdef _WIN32 |
| #include <windows.h> |
| #endif |
| |
| 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); |
| } |
| |
| /* Please keep in synch with qemu-img.texi */ |
| static void help(void) |
| { |
| const char *help_msg = |
| "qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n" |
| "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" |
| " '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" |
| " '-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 that must contain only zeros\n" |
| " for qemu-img to create a sparse image during conversion\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(1); |
| } |
| |
| 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; |
| } |
| |
| #if defined(WIN32) |
| /* XXX: put correct support for win32 */ |
| static int read_password(char *buf, int buf_size) |
| { |
| int c, i; |
| printf("Password: "); |
| fflush(stdout); |
| i = 0; |
| for(;;) { |
| c = getchar(); |
| if (c == '\n') |
| break; |
| if (i < (buf_size - 1)) |
| buf[i++] = c; |
| } |
| buf[i] = '\0'; |
| return 0; |
| } |
| |
| #else |
| |
| #include <termios.h> |
| |
| static struct termios oldtty; |
| |
| static void term_exit(void) |
| { |
| tcsetattr (0, TCSANOW, &oldtty); |
| } |
| |
| static void term_init(void) |
| { |
| struct termios tty; |
| |
| tcgetattr (0, &tty); |
| oldtty = tty; |
| |
| tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP |
| |INLCR|IGNCR|ICRNL|IXON); |
| tty.c_oflag |= OPOST; |
| tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); |
| tty.c_cflag &= ~(CSIZE|PARENB); |
| tty.c_cflag |= CS8; |
| tty.c_cc[VMIN] = 1; |
| tty.c_cc[VTIME] = 0; |
| |
| tcsetattr (0, TCSANOW, &tty); |
| |
| atexit(term_exit); |
| } |
| |
| static int read_password(char *buf, int buf_size) |
| { |
| uint8_t ch; |
| int i, ret; |
| |
| printf("password: "); |
| fflush(stdout); |
| term_init(); |
| i = 0; |
| for(;;) { |
| ret = read(0, &ch, 1); |
| if (ret == -1) { |
| if (errno == EAGAIN || errno == EINTR) { |
| continue; |
| } else { |
| ret = -1; |
| break; |
| } |
| } else if (ret == 0) { |
| ret = -1; |
| break; |
| } else { |
| if (ch == '\r') { |
| ret = 0; |
| break; |
| } |
| if (i < (buf_size - 1)) |
| buf[i++] = ch; |
| } |
| } |
| term_exit(); |
| buf[i] = '\0'; |
| printf("\n"); |
| return ret; |
| } |
| #endif |
| |
| static int print_block_option_help(const char *filename, const char *fmt) |
| { |
| BlockDriver *drv, *proto_drv; |
| QEMUOptionParameter *create_options = NULL; |
| |
| /* Find driver and parse its options */ |
| drv = bdrv_find_format(fmt); |
| if (!drv) { |
| error_report("Unknown file format '%s'", fmt); |
| return 1; |
| } |
| |
| proto_drv = bdrv_find_protocol(filename, true); |
| if (!proto_drv) { |
| error_report("Unknown protocol '%s'", filename); |
| return 1; |
| } |
| |
| create_options = append_option_parameters(create_options, |
| drv->create_options); |
| create_options = append_option_parameters(create_options, |
| proto_drv->create_options); |
| print_option_help(create_options); |
| free_option_parameters(create_options); |
| return 0; |
| } |
| |
| static BlockDriverState *bdrv_new_open(const char *filename, |
| const char *fmt, |
| int flags, |
| bool require_io, |
| bool quiet) |
| { |
| BlockDriverState *bs; |
| BlockDriver *drv; |
| char password[256]; |
| int ret; |
| |
| bs = bdrv_new("image"); |
| |
| if (fmt) { |
| drv = bdrv_find_format(fmt); |
| if (!drv) { |
| error_report("Unknown file format '%s'", fmt); |
| goto fail; |
| } |
| } else { |
| drv = NULL; |
| } |
| |
| ret = bdrv_open(bs, filename, NULL, flags, drv); |
| if (ret < 0) { |
| error_report("Could not open '%s': %s", filename, strerror(-ret)); |
| goto fail; |
| } |
| |
| if (bdrv_is_encrypted(bs) && require_io) { |
| qprintf(quiet, "Disk image '%s' is encrypted.\n", filename); |
| if (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 bs; |
| fail: |
| if (bs) { |
| bdrv_unref(bs); |
| } |
| return NULL; |
| } |
| |
| static int add_old_style_options(const char *fmt, QEMUOptionParameter *list, |
| const char *base_filename, |
| const char *base_fmt) |
| { |
| if (base_filename) { |
| if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) { |
| error_report("Backing file not supported for file format '%s'", |
| fmt); |
| return -1; |
| } |
| } |
| if (base_fmt) { |
| if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) { |
| error_report("Backing file format not supported for file " |
| "format '%s'", fmt); |
| 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!"); |
| return 1; |
| case '6': |
| error_report("option -6 is deprecated, please use \'-o " |
| "compat6\' instead!"); |
| return 1; |
| case 'o': |
| options = optarg; |
| break; |
| case 'q': |
| quiet = true; |
| break; |
| } |
| } |
| |
| /* Get the filename */ |
| if (optind >= argc) { |
| help(); |
| } |
| filename = argv[optind++]; |
| |
| /* Get image size, if specified */ |
| if (optind < argc) { |
| int64_t sval; |
| char *end; |
| sval = strtosz_suffix(argv[optind++], &end, 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."); |
| } |
| return 1; |
| } |
| img_size = (uint64_t)sval; |
| } |
| if (optind != argc) { |
| help(); |
| } |
| |
| if (options && is_help_option(options)) { |
| return print_block_option_help(filename, fmt); |
| } |
| |
| bdrv_img_create(filename, fmt, base_filename, base_fmt, |
| options, img_size, BDRV_O_FLAGS, &local_err, quiet); |
| if (error_is_set(&local_err)) { |
| error_report("%s", error_get_pretty(local_err)); |
| error_free(local_err); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static void dump_json_image_check(ImageCheck *check, bool quiet) |
| { |
| Error *errp = NULL; |
| QString *str; |
| QmpOutputVisitor *ov = qmp_output_visitor_new(); |
| QObject *obj; |
| visit_type_ImageCheck(qmp_output_get_visitor(ov), |
| &check, NULL, &errp); |
| 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 |
| */ |
| static int img_check(int argc, char **argv) |
| { |
| int c, ret; |
| OutputFormat output_format = OFORMAT_HUMAN; |
| const char *filename, *fmt, *output; |
| BlockDriverState *bs; |
| int fix = 0; |
| int flags = BDRV_O_FLAGS | BDRV_O_CHECK; |
| ImageCheck *check; |
| bool quiet = false; |
| |
| 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'}, |
| {"repair", no_argument, 0, 'r'}, |
| {"output", required_argument, 0, OPTION_OUTPUT}, |
| {0, 0, 0, 0} |
| }; |
| c = getopt_long(argc, argv, "f:hr: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 { |
| help(); |
| } |
| break; |
| case OPTION_OUTPUT: |
| output = optarg; |
| break; |
| case 'q': |
| quiet = true; |
| break; |
| } |
| } |
| if (optind != argc - 1) { |
| help(); |
| } |
| 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; |
| } |
| |
| bs = bdrv_new_open(filename, fmt, flags, true, quiet); |
| if (!bs) { |
| return 1; |
| } |
| |
| check = g_new0(ImageCheck, 1); |
| ret = collect_image_check(bs, check, filename, fmt, fix); |
| |
| if (ret == -ENOTSUP) { |
| if (output_format == OFORMAT_HUMAN) { |
| error_report("This image format does not support checks"); |
| } |
| ret = 1; |
| 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; |
| } |
| |
| 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) { |
| ret = 1; |
| goto fail; |
| } |
| |
| if (check->corruptions) { |
| ret = 2; |
| } else if (check->leaks) { |
| ret = 3; |
| } else { |
| ret = 0; |
| } |
| |
| fail: |
| qapi_free_ImageCheck(check); |
| bdrv_unref(bs); |
| |
| return ret; |
| } |
| |
| static int img_commit(int argc, char **argv) |
| { |
| int c, ret, flags; |
| const char *filename, *fmt, *cache; |
| BlockDriverState *bs; |
| bool quiet = false; |
| |
| fmt = NULL; |
| cache = BDRV_DEFAULT_CACHE; |
| for(;;) { |
| c = getopt(argc, argv, "f:ht:q"); |
| if (c == -1) { |
| break; |
| } |
| switch(c) { |
| case '?': |
| case 'h': |
| help(); |
| break; |
| case 'f': |
| fmt = optarg; |
| break; |
| case 't': |
| cache = optarg; |
| break; |
| case 'q': |
| quiet = true; |
| break; |
| } |
| } |
| if (optind != argc - 1) { |
| help(); |
| } |
| filename = argv[optind++]; |
| |
| flags = BDRV_O_RDWR; |
| ret = bdrv_parse_cache_flags(cache, &flags); |
| if (ret < 0) { |
| error_report("Invalid cache option: %s", cache); |
| return -1; |
| } |
| |
| bs = bdrv_new_open(filename, fmt, flags, true, quiet); |
| if (!bs) { |
| return 1; |
| } |
| ret = bdrv_commit(bs); |
| switch(ret) { |
| case 0: |
| qprintf(quiet, "Image committed.\n"); |
| break; |
| case -ENOENT: |
| error_report("No disk inserted"); |
| break; |
| case -EACCES: |
| error_report("Image is read-only"); |
| break; |
| case -ENOTSUP: |
| error_report("Image is already committed"); |
| break; |
| default: |
| error_report("Error while committing image"); |
| break; |
| } |
| |
| bdrv_unref(bs); |
| if (ret) { |
| return 1; |
| } |
| 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) |
| { |
| int res, 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 bs: Driver used for accessing file |
| * @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(BlockDriverState *bs, int64_t sect_num, |
| int sect_count, const char *filename, |
| uint8_t *buffer, bool quiet) |
| { |
| int pnum, ret = 0; |
| ret = bdrv_read(bs, 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, *filename1, *filename2; |
| 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; |
| int64_t total_sectors; |
| int64_t sector_num = 0; |
| int64_t nb_sectors; |
| int c, pnum; |
| uint64_t bs_sectors; |
| uint64_t progress_base; |
| |
| for (;;) { |
| c = getopt(argc, argv, "hpf:F:sq"); |
| if (c == -1) { |
| break; |
| } |
| switch (c) { |
| case '?': |
| case 'h': |
| help(); |
| break; |
| case 'f': |
| fmt1 = optarg; |
| break; |
| case 'F': |
| fmt2 = 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) { |
| help(); |
| } |
| filename1 = argv[optind++]; |
| filename2 = argv[optind++]; |
| |
| /* Initialize before goto out */ |
| qemu_progress_init(progress, 2.0); |
| |
| bs1 = bdrv_new_open(filename1, fmt1, BDRV_O_FLAGS, true, quiet); |
| if (!bs1) { |
| error_report("Can't open file %s", filename1); |
| ret = 2; |
| goto out3; |
| } |
| |
| bs2 = bdrv_new_open(filename2, fmt2, BDRV_O_FLAGS, true, quiet); |
| if (!bs2) { |
| error_report("Can't open file %s", filename2); |
| ret = 2; |
| goto out2; |
| } |
| |
| buf1 = qemu_blockalign(bs1, IO_BUF_SIZE); |
| buf2 = qemu_blockalign(bs2, IO_BUF_SIZE); |
| bdrv_get_geometry(bs1, &bs_sectors); |
| total_sectors1 = bs_sectors; |
| bdrv_get_geometry(bs2, &bs_sectors); |
| total_sectors2 = bs_sectors; |
| 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 = bdrv_read(bs1, 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 = bdrv_read(bs2, 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) { |
| ret = 1; |
| qprintf(quiet, "Content mismatch at offset %" PRId64 "!\n", |
| sectors_to_bytes( |
| ret ? sector_num : sector_num + pnum)); |
| 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(bs1, sector_num, nb_sectors, |
| filename1, buf1, quiet); |
| } else { |
| ret = check_empty_sectors(bs2, sector_num, nb_sectors, |
| filename2, buf1, quiet); |
| } |
| if (ret) { |
| if (ret < 0) { |
| ret = 4; |
| error_report("Error while reading offset %" PRId64 ": %s", |
| sectors_to_bytes(sector_num), strerror(-ret)); |
| } |
| goto out; |
| } |
| } |
| sector_num += nb_sectors; |
| qemu_progress_print(((float) nb_sectors / progress_base)*100, 100); |
| } |
| |
| if (total_sectors1 != total_sectors2) { |
| BlockDriverState *bs_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; |
| bs_over = bs1; |
| filename_over = filename1; |
| } else { |
| total_sectors_over = total_sectors2; |
| bs_over = bs2; |
| filename_over = filename2; |
| } |
| |
| for (;;) { |
| nb_sectors = sectors_to_process(total_sectors_over, sector_num); |
| if (nb_sectors <= 0) { |
| break; |
| } |
| ret = bdrv_is_allocated_above(bs_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(bs_over, sector_num, nb_sectors, |
| filename_over, buf1, quiet); |
| if (ret) { |
| if (ret < 0) { |
| ret = 4; |
| error_report("Error while reading offset %" PRId64 |
| " of %s: %s", sectors_to_bytes(sector_num), |
| filename_over, strerror(-ret)); |
| } |
| 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: |
| bdrv_unref(bs2); |
| qemu_vfree(buf1); |
| qemu_vfree(buf2); |
| out2: |
| bdrv_unref(bs1); |
| out3: |
| qemu_progress_end(); |
| return ret; |
| } |
| |
| static int img_convert(int argc, char **argv) |
| { |
| int c, ret = 0, n, n1, bs_n, bs_i, compress, cluster_size, |
| cluster_sectors, skip_create; |
| int progress = 0, flags; |
| const char *fmt, *out_fmt, *cache, *out_baseimg, *out_filename; |
| BlockDriver *drv, *proto_drv; |
| BlockDriverState **bs = NULL, *out_bs = NULL; |
| int64_t total_sectors, nb_sectors, sector_num, bs_offset; |
| uint64_t bs_sectors; |
| uint8_t * buf = NULL; |
| const uint8_t *buf1; |
| BlockDriverInfo bdi; |
| QEMUOptionParameter *param = NULL, *create_options = NULL; |
| QEMUOptionParameter *out_baseimg_param; |
| char *options = NULL; |
| const char *snapshot_name = NULL; |
| float local_progress = 0; |
| int min_sparse = 8; /* Need at least 4k of zeros for sparse detection */ |
| bool quiet = false; |
| |
| fmt = NULL; |
| out_fmt = "raw"; |
| cache = "unsafe"; |
| out_baseimg = NULL; |
| compress = 0; |
| skip_create = 0; |
| for(;;) { |
| c = getopt(argc, argv, "f:O:B:s:hce6o:pS: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!"); |
| return 1; |
| case '6': |
| error_report("option -6 is deprecated, please use \'-o " |
| "compat6\' instead!"); |
| return 1; |
| case 'o': |
| options = optarg; |
| break; |
| case 's': |
| snapshot_name = optarg; |
| break; |
| case 'S': |
| { |
| int64_t sval; |
| char *end; |
| sval = strtosz_suffix(optarg, &end, STRTOSZ_DEFSUFFIX_B); |
| if (sval < 0 || *end) { |
| error_report("Invalid minimum zero buffer size for sparse output specified"); |
| return 1; |
| } |
| |
| min_sparse = sval / BDRV_SECTOR_SIZE; |
| break; |
| } |
| case 'p': |
| progress = 1; |
| break; |
| case 't': |
| cache = optarg; |
| break; |
| case 'q': |
| quiet = true; |
| break; |
| case 'n': |
| skip_create = 1; |
| break; |
| } |
| } |
| |
| if (quiet) { |
| progress = 0; |
| } |
| |
| bs_n = argc - optind - 1; |
| if (bs_n < 1) { |
| help(); |
| } |
| |
| out_filename = argv[argc - 1]; |
| |
| /* Initialize before goto out */ |
| qemu_progress_init(progress, 2.0); |
| |
| if (options && is_help_option(options)) { |
| ret = print_block_option_help(out_filename, out_fmt); |
| goto out; |
| } |
| |
| if (bs_n > 1 && out_baseimg) { |
| error_report("-B makes no sense when concatenating multiple input " |
| "images"); |
| ret = -1; |
| goto out; |
| } |
| |
| qemu_progress_print(0, 100); |
| |
| bs = g_malloc0(bs_n * sizeof(BlockDriverState *)); |
| |
| total_sectors = 0; |
| for (bs_i = 0; bs_i < bs_n; bs_i++) { |
| bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS, true, |
| quiet); |
| if (!bs[bs_i]) { |
| error_report("Could not open '%s'", argv[optind + bs_i]); |
| ret = -1; |
| goto out; |
| } |
| bdrv_get_geometry(bs[bs_i], &bs_sectors); |
| total_sectors += bs_sectors; |
| } |
| |
| if (snapshot_name != NULL) { |
| if (bs_n > 1) { |
| error_report("No support for concatenating multiple snapshot"); |
| ret = -1; |
| goto out; |
| } |
| if (bdrv_snapshot_load_tmp(bs[0], snapshot_name) < 0) { |
| error_report("Failed to load snapshot"); |
| 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); |
| if (!proto_drv) { |
| error_report("Unknown protocol '%s'", out_filename); |
| ret = -1; |
| goto out; |
| } |
| |
| create_options = append_option_parameters(create_options, |
| drv->create_options); |
| create_options = append_option_parameters(create_options, |
| proto_drv->create_options); |
| |
| if (options) { |
| param = parse_option_parameters(options, create_options, param); |
| if (param == NULL) { |
| error_report("Invalid options for file format '%s'.", out_fmt); |
| ret = -1; |
| goto out; |
| } |
| } else { |
| param = parse_option_parameters("", create_options, param); |
| } |
| |
| set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512); |
| ret = add_old_style_options(out_fmt, param, out_baseimg, NULL); |
| if (ret < 0) { |
| goto out; |
| } |
| |
| /* Get backing file name if -o backing_file was used */ |
| out_baseimg_param = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
| if (out_baseimg_param) { |
| out_baseimg = out_baseimg_param->value.s; |
| } |
| |
| /* Check if compression is supported */ |
| if (compress) { |
| QEMUOptionParameter *encryption = |
| get_option_parameter(param, BLOCK_OPT_ENCRYPT); |
| QEMUOptionParameter *preallocation = |
| get_option_parameter(param, BLOCK_OPT_PREALLOC); |
| |
| if (!drv->bdrv_write_compressed) { |
| error_report("Compression not supported for this file format"); |
| ret = -1; |
| goto out; |
| } |
| |
| if (encryption && encryption->value.n) { |
| error_report("Compression and encryption not supported at " |
| "the same time"); |
| ret = -1; |
| goto out; |
| } |
| |
| if (preallocation && preallocation->value.s |
| && strcmp(preallocation->value.s, "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, param); |
| if (ret < 0) { |
| if (ret == -ENOTSUP) { |
| error_report("Formatting not supported for file format '%s'", |
| out_fmt); |
| } else if (ret == -EFBIG) { |
| error_report("The image size is too large for file format '%s'", |
| out_fmt); |
| } else { |
| error_report("%s: error while converting %s: %s", |
| out_filename, out_fmt, strerror(-ret)); |
| } |
| goto out; |
| } |
| } |
| |
| flags = BDRV_O_RDWR; |
| ret = bdrv_parse_cache_flags(cache, &flags); |
| if (ret < 0) { |
| error_report("Invalid cache option: %s", cache); |
| return -1; |
| } |
| |
| out_bs = bdrv_new_open(out_filename, out_fmt, flags, true, quiet); |
| if (!out_bs) { |
| ret = -1; |
| goto out; |
| } |
| |
| bs_i = 0; |
| bs_offset = 0; |
| bdrv_get_geometry(bs[0], &bs_sectors); |
| buf = qemu_blockalign(out_bs, IO_BUF_SIZE); |
| |
| if (skip_create) { |
| int64_t output_length = bdrv_getlength(out_bs); |
| if (output_length < 0) { |
| error_report("unable to get output image length: %s\n", |
| strerror(-output_length)); |
| ret = -1; |
| goto out; |
| } else if (output_length < total_sectors << BDRV_SECTOR_BITS) { |
| error_report("output file is smaller than input file"); |
| ret = -1; |
| goto out; |
| } |
| } |
| |
| if (compress) { |
| ret = bdrv_get_info(out_bs, &bdi); |
| if (ret < 0) { |
| error_report("could not get block driver info"); |
| goto out; |
| } |
| cluster_size = bdi.cluster_size; |
| if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) { |
| error_report("invalid cluster size"); |
| ret = -1; |
| goto out; |
| } |
| cluster_sectors = cluster_size >> 9; |
| sector_num = 0; |
| |
| nb_sectors = total_sectors; |
| if (nb_sectors != 0) { |
| local_progress = (float)100 / |
| (nb_sectors / MIN(nb_sectors, cluster_sectors)); |
| } |
| |
| for(;;) { |
| int64_t bs_num; |
| int remainder; |
| uint8_t *buf2; |
| |
| nb_sectors = total_sectors - sector_num; |
| if (nb_sectors <= 0) |
| break; |
| if (nb_sectors >= cluster_sectors) |
| n = cluster_sectors; |
| else |
| n = nb_sectors; |
| |
| bs_num = sector_num - bs_offset; |
| assert (bs_num >= 0); |
| remainder = n; |
| buf2 = buf; |
| while (remainder > 0) { |
| int nlow; |
| while (bs_num == bs_sectors) { |
| bs_i++; |
| assert (bs_i < bs_n); |
| bs_offset += bs_sectors; |
| bdrv_get_geometry(bs[bs_i], &bs_sectors); |
| bs_num = 0; |
| /* printf("changing part: sector_num=%" PRId64 ", " |
| "bs_i=%d, bs_offset=%" PRId64 ", bs_sectors=%" PRId64 |
| "\n", sector_num, bs_i, bs_offset, bs_sectors); */ |
| } |
| assert (bs_num < bs_sectors); |
| |
| nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder; |
| |
| ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow); |
| if (ret < 0) { |
| error_report("error while reading sector %" PRId64 ": %s", |
| bs_num, strerror(-ret)); |
| goto out; |
| } |
| |
| buf2 += nlow * 512; |
| bs_num += nlow; |
| |
| remainder -= nlow; |
| } |
| assert (remainder == 0); |
| |
| if (!buffer_is_zero(buf, n * BDRV_SECTOR_SIZE)) { |
| ret = bdrv_write_compressed(out_bs, sector_num, buf, n); |
| if (ret != 0) { |
| error_report("error while compressing sector %" PRId64 |
| ": %s", sector_num, strerror(-ret)); |
| goto out; |
| } |
| } |
| sector_num += n; |
| qemu_progress_print(local_progress, 100); |
| } |
| /* signal EOF to align */ |
| bdrv_write_compressed(out_bs, 0, NULL, 0); |
| } else { |
| int has_zero_init = bdrv_has_zero_init(out_bs); |
| |
| sector_num = 0; // total number of sectors converted so far |
| nb_sectors = total_sectors - sector_num; |
| if (nb_sectors != 0) { |
| local_progress = (float)100 / |
| (nb_sectors / MIN(nb_sectors, IO_BUF_SIZE / 512)); |
| } |
| |
| for(;;) { |
| nb_sectors = total_sectors - sector_num; |
| if (nb_sectors <= 0) { |
| break; |
| } |
| if (nb_sectors >= (IO_BUF_SIZE / 512)) { |
| n = (IO_BUF_SIZE / 512); |
| } else { |
| n = nb_sectors; |
| } |
| |
| while (sector_num - bs_offset >= bs_sectors) { |
| bs_i ++; |
| assert (bs_i < bs_n); |
| bs_offset += bs_sectors; |
| bdrv_get_geometry(bs[bs_i], &bs_sectors); |
| /* printf("changing part: sector_num=%" PRId64 ", bs_i=%d, " |
| "bs_offset=%" PRId64 ", bs_sectors=%" PRId64 "\n", |
| sector_num, bs_i, bs_offset, bs_sectors); */ |
| } |
| |
| if (n > bs_offset + bs_sectors - sector_num) { |
| n = bs_offset + bs_sectors - sector_num; |
| } |
| |
| /* If the output image is being created as a copy on write image, |
| assume that sectors which are unallocated in the input image |
| are present in both the output's and input's base images (no |
| need to copy them). */ |
| if (out_baseimg) { |
| ret = bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, |
| n, &n1); |
| if (ret < 0) { |
| error_report("error while reading metadata for sector " |
| "%" PRId64 ": %s", |
| sector_num - bs_offset, strerror(-ret)); |
| goto out; |
| } |
| if (!ret) { |
| sector_num += n1; |
| continue; |
| } |
| /* The next 'n1' sectors are allocated in the input image. Copy |
| only those as they may be followed by unallocated sectors. */ |
| n = n1; |
| } else { |
| n1 = n; |
| } |
| |
| ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n); |
| if (ret < 0) { |
| error_report("error while reading sector %" PRId64 ": %s", |
| sector_num - bs_offset, strerror(-ret)); |
| goto out; |
| } |
| /* NOTE: at the same time we convert, we do not write zero |
| sectors to have a chance to compress the image. Ideally, we |
| should add a specific call to have the info to go faster */ |
| buf1 = buf; |
| while (n > 0) { |
| if (!has_zero_init || |
| is_allocated_sectors_min(buf1, n, &n1, min_sparse)) { |
| ret = bdrv_write(out_bs, sector_num, buf1, n1); |
| if (ret < 0) { |
| error_report("error while writing sector %" PRId64 |
| ": %s", sector_num, strerror(-ret)); |
| goto out; |
| } |
| } |
| sector_num += n1; |
| n -= n1; |
| buf1 += n1 * 512; |
| } |
| qemu_progress_print(local_progress, 100); |
| } |
| } |
| out: |
| qemu_progress_end(); |
| free_option_parameters(create_options); |
| free_option_parameters(param); |
| qemu_vfree(buf); |
| if (out_bs) { |
| bdrv_unref(out_bs); |
| } |
| if (bs) { |
| for (bs_i = 0; bs_i < bs_n; bs_i++) { |
| if (bs[bs_i]) { |
| bdrv_unref(bs[bs_i]); |
| } |
| } |
| g_free(bs); |
| } |
| 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 *errp = NULL; |
| QString *str; |
| QmpOutputVisitor *ov = qmp_output_visitor_new(); |
| QObject *obj; |
| visit_type_ImageInfoList(qmp_output_get_visitor(ov), |
| &list, NULL, &errp); |
| 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 *errp = NULL; |
| QString *str; |
| QmpOutputVisitor *ov = qmp_output_visitor_new(); |
| QObject *obj; |
| visit_type_ImageInfo(qmp_output_get_visitor(ov), |
| &info, NULL, &errp); |
| 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) { |
| 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); |
| |
| bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING, |
| false, false); |
| if (!bs) { |
| goto err; |
| } |
| |
| bdrv_query_image_info(bs, &info, &err); |
| if (error_is_set(&err)) { |
| error_report("%s", error_get_pretty(err)); |
| error_free(err); |
| goto err; |
| } |
| |
| elem = g_new0(ImageInfoList, 1); |
| elem->value = info; |
| *last = elem; |
| last = &elem->next; |
| |
| bdrv_unref(bs); |
| |
| 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) { |
| help(); |
| } |
| 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 = bs->backing_hd; |
| 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; |
| 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) { |
| help(); |
| } |
| 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; |
| } |
| |
| bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS, true, false); |
| if (!bs) { |
| return 1; |
| } |
| |
| if (output_format == OFORMAT_HUMAN) { |
| printf("%-16s%-16s%-16s%s\n", "Offset", "Length", "Mapped to", "File"); |
| } |
| |
| length = bdrv_getlength(bs); |
| 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: |
| bdrv_unref(bs); |
| 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) |
| { |
| BlockDriverState *bs; |
| QEMUSnapshotInfo sn; |
| char *filename, *snapshot_name = NULL; |
| int c, ret = 0, bdrv_oflags; |
| int action = 0; |
| qemu_timeval tv; |
| bool quiet = false; |
| |
| 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) { |
| help(); |
| return 0; |
| } |
| action = SNAPSHOT_LIST; |
| bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */ |
| break; |
| case 'a': |
| if (action) { |
| help(); |
| return 0; |
| } |
| action = SNAPSHOT_APPLY; |
| snapshot_name = optarg; |
| break; |
| case 'c': |
| if (action) { |
| help(); |
| return 0; |
| } |
| action = SNAPSHOT_CREATE; |
| snapshot_name = optarg; |
| break; |
| case 'd': |
| if (action) { |
| help(); |
| return 0; |
| } |
| action = SNAPSHOT_DELETE; |
| snapshot_name = optarg; |
| break; |
| case 'q': |
| quiet = true; |
| break; |
| } |
| } |
| |
| if (optind != argc - 1) { |
| help(); |
| } |
| filename = argv[optind++]; |
| |
| /* Open the image */ |
| bs = bdrv_new_open(filename, NULL, bdrv_oflags, true, quiet); |
| if (!bs) { |
| return 1; |
| } |
| |
| /* 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: |
| ret = bdrv_snapshot_delete(bs, snapshot_name); |
| if (ret) { |
| error_report("Could not delete snapshot '%s': %d (%s)", |
| snapshot_name, ret, strerror(-ret)); |
| } |
| break; |
| } |
| |
| /* Cleanup */ |
| bdrv_unref(bs); |
| if (ret) { |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int img_rebase(int argc, char **argv) |
| { |
| BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL; |
| BlockDriver *old_backing_drv, *new_backing_drv; |
| char *filename; |
| const char *fmt, *cache, *out_basefmt, *out_baseimg; |
| int c, flags, ret; |
| int unsafe = 0; |
| int progress = 0; |
| bool quiet = false; |
| |
| /* Parse commandline parameters */ |
| fmt = NULL; |
| cache = BDRV_DEFAULT_CACHE; |
| out_baseimg = NULL; |
| out_basefmt = NULL; |
| for(;;) { |
| c = getopt(argc, argv, "uhf:F:b:pt: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 'q': |
| quiet = true; |
| break; |
| } |
| } |
| |
| if (quiet) { |
| progress = 0; |
| } |
| |
| if ((optind != argc - 1) || (!unsafe && !out_baseimg)) { |
| help(); |
| } |
| 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); |
| return -1; |
| } |
| |
| /* |
| * 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. |
| */ |
| bs = bdrv_new_open(filename, fmt, flags, true, quiet); |
| if (!bs) { |
| return 1; |
| } |
| |
| /* Find the right drivers for the backing files */ |
| old_backing_drv = NULL; |
| new_backing_drv = NULL; |
| |
| if (!unsafe && bs->backing_format[0] != '\0') { |
| old_backing_drv = bdrv_find_format(bs->backing_format); |
| if (old_backing_drv == NULL) { |
| error_report("Invalid format name: '%s'", bs->backing_format); |
| ret = -1; |
| goto out; |
| } |
| } |
| |
| if (out_basefmt != NULL) { |
| new_backing_drv = bdrv_find_format(out_basefmt); |
| if (new_backing_drv == 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) { |
| /* Make the compiler happy */ |
| bs_old_backing = NULL; |
| bs_new_backing = NULL; |
| } else { |
| char backing_name[1024]; |
| |
| bs_old_backing = bdrv_new("old_backing"); |
| bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name)); |
| ret = bdrv_open(bs_old_backing, backing_name, NULL, BDRV_O_FLAGS, |
| old_backing_drv); |
| if (ret) { |
| error_report("Could not open old backing file '%s'", backing_name); |
| goto out; |
| } |
| if (out_baseimg[0]) { |
| bs_new_backing = bdrv_new("new_backing"); |
| ret = bdrv_open(bs_new_backing, out_baseimg, NULL, BDRV_O_FLAGS, |
| new_backing_drv); |
| if (ret) { |
| error_report("Could not open new backing file '%s'", |
| out_baseimg); |
| 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) { |
| uint64_t num_sectors; |
| uint64_t old_backing_num_sectors; |
| uint64_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 = qemu_blockalign(bs, IO_BUF_SIZE); |
| buf_new = qemu_blockalign(bs, IO_BUF_SIZE); |
| |
| bdrv_get_geometry(bs, &num_sectors); |
| bdrv_get_geometry(bs_old_backing, &old_backing_num_sectors); |
| if (bs_new_backing) { |
| bdrv_get_geometry(bs_new_backing, &new_backing_num_sectors); |
| } |
| |
| 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 = bdrv_read(bs_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 || !bs_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 = bdrv_read(bs_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 = bdrv_write(bs, 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) { |
| if (bs_old_backing != NULL) { |
| bdrv_unref(bs_old_backing); |
| } |
| if (bs_new_backing != NULL) { |
| bdrv_unref(bs_new_backing); |
| } |
| } |
| |
| bdrv_unref(bs); |
| if (ret) { |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int img_resize(int argc, char **argv) |
| { |
| int c, ret, relative; |
| const char *filename, *fmt, *size; |
| int64_t n, total_size; |
| bool quiet = false; |
| BlockDriverState *bs = 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) { |
| help(); |
| 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) { |
| help(); |
| } |
| 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_nofail(&resize_options); |
| if (qemu_opt_set(param, BLOCK_OPT_SIZE, size)) { |
| /* Error message already printed when size parsing fails */ |
| ret = -1; |
| qemu_opts_del(param); |
| goto out; |
| } |
| n = qemu_opt_get_size(param, BLOCK_OPT_SIZE, 0); |
| qemu_opts_del(param); |
| |
| bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR, true, quiet); |
| if (!bs) { |
| ret = -1; |
| goto out; |
| } |
| |
| if (relative) { |
| total_size = bdrv_getlength(bs) + n * relative; |
| } else { |
| total_size = n; |
| } |
| if (total_size <= 0) { |
| error_report("New image size must be positive"); |
| ret = -1; |
| goto out; |
| } |
| |
| ret = bdrv_truncate(bs, 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: |
| if (bs) { |
| bdrv_unref(bs); |
| } |
| 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; |
| |
| #ifdef CONFIG_POSIX |
| signal(SIGPIPE, SIG_IGN); |
| #endif |
| |
| error_set_progname(argv[0]); |
| |
| qemu_init_main_loop(); |
| bdrv_init(); |
| if (argc < 2) |
| help(); |
| cmdname = argv[1]; |
| argc--; argv++; |
| |
| /* find the command */ |
| for(cmd = img_cmds; cmd->name != NULL; cmd++) { |
| if (!strcmp(cmdname, cmd->name)) { |
| return cmd->handler(argc, argv); |
| } |
| } |
| |
| /* not found */ |
| help(); |
| return 0; |
| } |