| /* |
| * 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 "qemu-common.h" |
| #include "qemu-option.h" |
| #include "qemu-error.h" |
| #include "osdep.h" |
| #include "sysemu.h" |
| #include "block_int.h" |
| #include <stdio.h> |
| |
| #ifdef _WIN32 |
| #include <windows.h> |
| #endif |
| |
| typedef struct img_cmd_t { |
| const char *name; |
| int (*handler)(int argc, char **argv); |
| } img_cmd_t; |
| |
| /* Default to cache=writeback as data integrity is not important for qemu-tcg. */ |
| #define BDRV_O_FLAGS BDRV_O_CACHE_WB |
| |
| 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" |
| " 'size' is the disk image size in bytes. Optional suffixes\n" |
| " 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n" |
| " and T (terabyte, 1024G) are 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" |
| "\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"; |
| |
| printf("%s\nSupported formats:", help_msg); |
| bdrv_iterate_format(format_print, NULL); |
| printf("\n"); |
| exit(1); |
| } |
| |
| #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); |
| 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) |
| { |
| 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, flags, drv); |
| if (ret < 0) { |
| error_report("Could not open '%s': %s", filename, strerror(-ret)); |
| goto fail; |
| } |
| |
| if (bdrv_is_encrypted(bs)) { |
| printf("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_delete(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, ret = 0; |
| 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; |
| |
| for(;;) { |
| c = getopt(argc, argv, "F:b:f:he6o:"); |
| 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("qemu-img: option -e is deprecated, please use \'-o " |
| "encryption\' instead!"); |
| return 1; |
| case '6': |
| error_report("qemu-img: option -6 is deprecated, please use \'-o " |
| "compat6\' instead!"); |
| return 1; |
| case 'o': |
| options = optarg; |
| break; |
| } |
| } |
| |
| /* Get the filename */ |
| if (optind >= argc) { |
| help(); |
| } |
| filename = argv[optind++]; |
| |
| /* Get image size, if specified */ |
| if (optind < argc) { |
| int64_t sval; |
| sval = strtosz_suffix(argv[optind++], NULL, STRTOSZ_DEFSUFFIX_B); |
| if (sval < 0) { |
| error_report("Invalid image size specified! You may use k, M, G or " |
| "T suffixes for "); |
| error_report("kilobytes, megabytes, gigabytes and terabytes."); |
| ret = -1; |
| goto out; |
| } |
| img_size = (uint64_t)sval; |
| } |
| |
| if (options && !strcmp(options, "?")) { |
| ret = print_block_option_help(filename, fmt); |
| goto out; |
| } |
| |
| ret = bdrv_img_create(filename, fmt, base_filename, base_fmt, |
| options, img_size, BDRV_O_FLAGS); |
| out: |
| if (ret) { |
| return 1; |
| } |
| 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; |
| const char *filename, *fmt; |
| BlockDriverState *bs; |
| BdrvCheckResult result; |
| |
| fmt = NULL; |
| for(;;) { |
| c = getopt(argc, argv, "f:h"); |
| if (c == -1) { |
| break; |
| } |
| switch(c) { |
| case '?': |
| case 'h': |
| help(); |
| break; |
| case 'f': |
| fmt = optarg; |
| break; |
| } |
| } |
| if (optind >= argc) { |
| help(); |
| } |
| filename = argv[optind++]; |
| |
| bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS); |
| if (!bs) { |
| return 1; |
| } |
| ret = bdrv_check(bs, &result); |
| |
| if (ret == -ENOTSUP) { |
| error_report("This image format does not support checks"); |
| bdrv_delete(bs); |
| return 1; |
| } |
| |
| if (!(result.corruptions || result.leaks || result.check_errors)) { |
| printf("No errors were found on the image.\n"); |
| } else { |
| if (result.corruptions) { |
| printf("\n%d errors were found on the image.\n" |
| "Data may be corrupted, or further writes to the image " |
| "may corrupt it.\n", |
| result.corruptions); |
| } |
| |
| if (result.leaks) { |
| printf("\n%d leaked clusters were found on the image.\n" |
| "This means waste of disk space, but no harm to data.\n", |
| result.leaks); |
| } |
| |
| if (result.check_errors) { |
| printf("\n%d internal errors have occurred during the check.\n", |
| result.check_errors); |
| } |
| } |
| |
| bdrv_delete(bs); |
| |
| if (ret < 0 || result.check_errors) { |
| printf("\nAn error has occurred during the check: %s\n" |
| "The check is not complete and may have missed error.\n", |
| strerror(-ret)); |
| return 1; |
| } |
| |
| if (result.corruptions) { |
| return 2; |
| } else if (result.leaks) { |
| return 3; |
| } else { |
| return 0; |
| } |
| } |
| |
| static int img_commit(int argc, char **argv) |
| { |
| int c, ret; |
| const char *filename, *fmt; |
| BlockDriverState *bs; |
| |
| fmt = NULL; |
| for(;;) { |
| c = getopt(argc, argv, "f:h"); |
| if (c == -1) { |
| break; |
| } |
| switch(c) { |
| case '?': |
| case 'h': |
| help(); |
| break; |
| case 'f': |
| fmt = optarg; |
| break; |
| } |
| } |
| if (optind >= argc) { |
| help(); |
| } |
| filename = argv[optind++]; |
| |
| bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
| if (!bs) { |
| return 1; |
| } |
| ret = bdrv_commit(bs); |
| switch(ret) { |
| case 0: |
| printf("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_delete(bs); |
| if (ret) { |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int is_not_zero(const uint8_t *sector, int len) |
| { |
| int i; |
| len >>= 2; |
| for(i = 0;i < len; i++) { |
| if (((uint32_t *)sector)[i] != 0) |
| 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) |
| { |
| int v, i; |
| |
| if (n <= 0) { |
| *pnum = 0; |
| return 0; |
| } |
| v = is_not_zero(buf, 512); |
| for(i = 1; i < n; i++) { |
| buf += 512; |
| if (v != is_not_zero(buf, 512)) |
| break; |
| } |
| *pnum = i; |
| return v; |
| } |
| |
| /* |
| * 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 int img_convert(int argc, char **argv) |
| { |
| int c, ret = 0, n, n1, bs_n, bs_i, compress, cluster_size, cluster_sectors; |
| const char *fmt, *out_fmt, *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; |
| |
| fmt = NULL; |
| out_fmt = "raw"; |
| out_baseimg = NULL; |
| compress = 0; |
| for(;;) { |
| c = getopt(argc, argv, "f:O:B:s:hce6o:"); |
| 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("qemu-img: option -e is deprecated, please use \'-o " |
| "encryption\' instead!"); |
| return 1; |
| case '6': |
| error_report("qemu-img: option -6 is deprecated, please use \'-o " |
| "compat6\' instead!"); |
| return 1; |
| case 'o': |
| options = optarg; |
| break; |
| case 's': |
| snapshot_name = optarg; |
| break; |
| } |
| } |
| |
| bs_n = argc - optind - 1; |
| if (bs_n < 1) { |
| help(); |
| } |
| |
| out_filename = argv[argc - 1]; |
| |
| if (options && !strcmp(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; |
| } |
| |
| bs = qemu_mallocz(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); |
| 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\n"); |
| ret = -1; |
| goto out; |
| } |
| if (bdrv_snapshot_load_tmp(bs[0], snapshot_name) < 0) { |
| error_report("Failed to load snapshot\n"); |
| 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); |
| 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); |
| |
| 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; |
| } |
| } |
| |
| /* 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; |
| } |
| |
| out_bs = bdrv_new_open(out_filename, out_fmt, |
| BDRV_O_FLAGS | BDRV_O_RDWR | BDRV_O_NO_FLUSH); |
| if (!out_bs) { |
| ret = -1; |
| goto out; |
| } |
| |
| bs_i = 0; |
| bs_offset = 0; |
| bdrv_get_geometry(bs[0], &bs_sectors); |
| buf = qemu_malloc(IO_BUF_SIZE); |
| |
| 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; |
| 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"); |
| goto out; |
| } |
| |
| buf2 += nlow * 512; |
| bs_num += nlow; |
| |
| remainder -= nlow; |
| } |
| assert (remainder == 0); |
| |
| if (n < cluster_sectors) { |
| memset(buf + n * 512, 0, cluster_size - n * 512); |
| } |
| if (is_not_zero(buf, cluster_size)) { |
| ret = bdrv_write_compressed(out_bs, sector_num, buf, |
| cluster_sectors); |
| if (ret != 0) { |
| error_report("error while compressing sector %" PRId64, |
| sector_num); |
| goto out; |
| } |
| } |
| sector_num += n; |
| } |
| /* 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 |
| 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 (has_zero_init) { |
| /* 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) { |
| if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset, |
| n, &n1)) { |
| 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"); |
| 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 the output image is being created as a copy on write image, |
| copy all sectors even the ones containing only NUL bytes, |
| because they may differ from the sectors in the base image. |
| |
| If the output is to a host device, we also write out |
| sectors that are entirely 0, since whatever data was |
| already there is garbage, not 0s. */ |
| if (!has_zero_init || out_baseimg || |
| is_allocated_sectors(buf1, n, &n1)) { |
| ret = bdrv_write(out_bs, sector_num, buf1, n1); |
| if (ret < 0) { |
| error_report("error while writing"); |
| goto out; |
| } |
| } |
| sector_num += n1; |
| n -= n1; |
| buf1 += n1 * 512; |
| } |
| } |
| } |
| out: |
| free_option_parameters(create_options); |
| free_option_parameters(param); |
| qemu_free(buf); |
| if (out_bs) { |
| bdrv_delete(out_bs); |
| } |
| if (bs) { |
| for (bs_i = 0; bs_i < bs_n; bs_i++) { |
| if (bs[bs_i]) { |
| bdrv_delete(bs[bs_i]); |
| } |
| } |
| qemu_free(bs); |
| } |
| if (ret) { |
| return 1; |
| } |
| return 0; |
| } |
| |
| #ifdef _WIN32 |
| static int64_t get_allocated_file_size(const char *filename) |
| { |
| typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high); |
| get_compressed_t get_compressed; |
| struct _stati64 st; |
| |
| /* WinNT support GetCompressedFileSize to determine allocate size */ |
| get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA"); |
| if (get_compressed) { |
| DWORD high, low; |
| low = get_compressed(filename, &high); |
| if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) |
| return (((int64_t) high) << 32) + low; |
| } |
| |
| if (_stati64(filename, &st) < 0) |
| return -1; |
| return st.st_size; |
| } |
| #else |
| static int64_t get_allocated_file_size(const char *filename) |
| { |
| struct stat st; |
| if (stat(filename, &st) < 0) |
| return -1; |
| return (int64_t)st.st_blocks * 512; |
| } |
| #endif |
| |
| static void dump_snapshots(BlockDriverState *bs) |
| { |
| QEMUSnapshotInfo *sn_tab, *sn; |
| int nb_sns, i; |
| char buf[256]; |
| |
| nb_sns = bdrv_snapshot_list(bs, &sn_tab); |
| if (nb_sns <= 0) |
| return; |
| printf("Snapshot list:\n"); |
| printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL)); |
| for(i = 0; i < nb_sns; i++) { |
| sn = &sn_tab[i]; |
| printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn)); |
| } |
| qemu_free(sn_tab); |
| } |
| |
| static int img_info(int argc, char **argv) |
| { |
| int c; |
| const char *filename, *fmt; |
| BlockDriverState *bs; |
| char fmt_name[128], size_buf[128], dsize_buf[128]; |
| uint64_t total_sectors; |
| int64_t allocated_size; |
| char backing_filename[1024]; |
| char backing_filename2[1024]; |
| BlockDriverInfo bdi; |
| |
| fmt = NULL; |
| for(;;) { |
| c = getopt(argc, argv, "f:h"); |
| if (c == -1) { |
| break; |
| } |
| switch(c) { |
| case '?': |
| case 'h': |
| help(); |
| break; |
| case 'f': |
| fmt = optarg; |
| break; |
| } |
| } |
| if (optind >= argc) { |
| help(); |
| } |
| filename = argv[optind++]; |
| |
| bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING); |
| if (!bs) { |
| return 1; |
| } |
| bdrv_get_format(bs, fmt_name, sizeof(fmt_name)); |
| bdrv_get_geometry(bs, &total_sectors); |
| get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512); |
| allocated_size = get_allocated_file_size(filename); |
| if (allocated_size < 0) { |
| snprintf(dsize_buf, sizeof(dsize_buf), "unavailable"); |
| } else { |
| get_human_readable_size(dsize_buf, sizeof(dsize_buf), |
| allocated_size); |
| } |
| printf("image: %s\n" |
| "file format: %s\n" |
| "virtual size: %s (%" PRId64 " bytes)\n" |
| "disk size: %s\n", |
| filename, fmt_name, size_buf, |
| (total_sectors * 512), |
| dsize_buf); |
| if (bdrv_is_encrypted(bs)) { |
| printf("encrypted: yes\n"); |
| } |
| if (bdrv_get_info(bs, &bdi) >= 0) { |
| if (bdi.cluster_size != 0) { |
| printf("cluster_size: %d\n", bdi.cluster_size); |
| } |
| } |
| bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename)); |
| if (backing_filename[0] != '\0') { |
| path_combine(backing_filename2, sizeof(backing_filename2), |
| filename, backing_filename); |
| printf("backing file: %s (actual path: %s)\n", |
| backing_filename, |
| backing_filename2); |
| } |
| dump_snapshots(bs); |
| bdrv_delete(bs); |
| return 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; |
| |
| bdrv_oflags = BDRV_O_FLAGS | BDRV_O_RDWR; |
| /* Parse commandline parameters */ |
| for(;;) { |
| c = getopt(argc, argv, "la:c:d:h"); |
| 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; |
| } |
| } |
| |
| if (optind >= argc) { |
| help(); |
| } |
| filename = argv[optind++]; |
| |
| /* Open the image */ |
| bs = bdrv_new_open(filename, NULL, bdrv_oflags); |
| 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_delete(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, *out_basefmt, *out_baseimg; |
| int c, flags, ret; |
| int unsafe = 0; |
| |
| /* Parse commandline parameters */ |
| fmt = NULL; |
| out_baseimg = NULL; |
| out_basefmt = NULL; |
| |
| for(;;) { |
| c = getopt(argc, argv, "uhf:F:b:"); |
| 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; |
| } |
| } |
| |
| if ((optind >= argc) || !out_baseimg) { |
| help(); |
| } |
| filename = argv[optind++]; |
| |
| /* |
| * 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. |
| */ |
| flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0); |
| bs = bdrv_new_open(filename, fmt, flags); |
| 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, BDRV_O_FLAGS, |
| old_backing_drv); |
| if (ret) { |
| error_report("Could not open old backing file '%s'", backing_name); |
| goto out; |
| } |
| |
| bs_new_backing = bdrv_new("new_backing"); |
| ret = bdrv_open(bs_new_backing, out_baseimg, 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 sector; |
| int n; |
| uint8_t * buf_old; |
| uint8_t * buf_new; |
| |
| buf_old = qemu_malloc(IO_BUF_SIZE); |
| buf_new = qemu_malloc(IO_BUF_SIZE); |
| |
| bdrv_get_geometry(bs, &num_sectors); |
| |
| 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) { |
| continue; |
| } |
| |
| /* Read old and new backing file */ |
| ret = bdrv_read(bs_old_backing, sector, buf_old, n); |
| if (ret < 0) { |
| error_report("error while reading from old backing file"); |
| goto out; |
| } |
| 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_free(buf_old); |
| qemu_free(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. |
| */ |
| ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt); |
| 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)); |
| } |
| |
| /* |
| * 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: |
| /* Cleanup */ |
| if (!unsafe) { |
| bdrv_delete(bs_old_backing); |
| bdrv_delete(bs_new_backing); |
| } |
| |
| bdrv_delete(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; |
| BlockDriverState *bs = NULL; |
| QEMUOptionParameter *param; |
| QEMUOptionParameter resize_options[] = { |
| { |
| .name = BLOCK_OPT_SIZE, |
| .type = OPT_SIZE, |
| .help = "Virtual disk size" |
| }, |
| { NULL } |
| }; |
| |
| fmt = NULL; |
| for(;;) { |
| c = getopt(argc, argv, "f:h"); |
| if (c == -1) { |
| break; |
| } |
| switch(c) { |
| case '?': |
| case 'h': |
| help(); |
| break; |
| case 'f': |
| fmt = optarg; |
| break; |
| } |
| } |
| if (optind + 1 >= argc) { |
| help(); |
| } |
| filename = argv[optind++]; |
| size = 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 = parse_option_parameters("", resize_options, NULL); |
| if (set_option_parameter(param, BLOCK_OPT_SIZE, size)) { |
| /* Error message already printed when size parsing fails */ |
| ret = -1; |
| goto out; |
| } |
| n = get_option_parameter(param, BLOCK_OPT_SIZE)->value.n; |
| free_option_parameters(param); |
| |
| bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR); |
| 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: |
| printf("Image resized.\n"); |
| break; |
| case -ENOTSUP: |
| error_report("This image format 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_delete(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; |
| |
| error_set_progname(argv[0]); |
| |
| 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; |
| } |
