diff options
| -rw-r--r-- | block/qcow2.c | 94 | ||||
| -rw-r--r-- | block/qcow2.h | 1 | ||||
| -rw-r--r-- | qapi/block-core.json | 8 | ||||
| -rw-r--r-- | tests/qemu-iotests/082.out | 27 |
4 files changed, 128 insertions, 2 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index c20141b..f32ddda 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -398,6 +398,21 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, #endif break; + case QCOW2_EXT_MAGIC_DATA_FILE: + { + s->image_data_file = g_malloc0(ext.len + 1); + ret = bdrv_pread(bs->file, offset, s->image_data_file, ext.len); + if (ret < 0) { + error_setg_errno(errp, -ret, + "ERROR: Could not read data file name"); + return ret; + } +#ifdef DEBUG_EXT + printf("Qcow2: Got external data file %s\n", s->image_data_file); +#endif + break; + } + default: /* unknown magic - save it in case we need to rewrite the header */ /* If you add a new feature, make sure to also update the fast @@ -1463,6 +1478,15 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, } if (s->incompatible_features & QCOW2_INCOMPAT_DATA_FILE) { + if (!s->data_file && s->image_data_file) { + s->data_file = bdrv_open_child(s->image_data_file, options, + "data-file", bs, &child_file, + false, errp); + if (!s->data_file) { + ret = -EINVAL; + goto fail; + } + } if (!s->data_file) { error_setg(errp, "'data-file' is required for this image"); ret = -EINVAL; @@ -1650,6 +1674,7 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, return ret; fail: + g_free(s->image_data_file); if (has_data_file(bs)) { bdrv_unref_child(bs, s->data_file); } @@ -2269,6 +2294,7 @@ static void qcow2_close(BlockDriverState *bs) g_free(s->unknown_header_fields); cleanup_unknown_header_ext(bs); + g_free(s->image_data_file); g_free(s->image_backing_file); g_free(s->image_backing_format); @@ -2445,6 +2471,19 @@ int qcow2_update_header(BlockDriverState *bs) buflen -= ret; } + /* External data file header extension */ + if (has_data_file(bs) && s->image_data_file) { + ret = header_ext_add(buf, QCOW2_EXT_MAGIC_DATA_FILE, + s->image_data_file, strlen(s->image_data_file), + buflen); + if (ret < 0) { + goto fail; + } + + buf += ret; + buflen -= ret; + } + /* Full disk encryption header pointer extension */ if (s->crypto_header.offset != 0) { s->crypto_header.offset = cpu_to_be64(s->crypto_header.offset); @@ -3086,6 +3125,12 @@ qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp) abort(); } + /* Set the external data file if necessary */ + if (data_bs) { + BDRVQcow2State *s = blk_bs(blk)->opaque; + s->image_data_file = g_strdup(data_bs->filename); + } + /* Create a full header (including things like feature table) */ ret = qcow2_update_header(blk_bs(blk)); if (ret < 0) { @@ -3165,6 +3210,7 @@ static int coroutine_fn qcow2_co_create_opts(const char *filename, QemuOpts *opt QDict *qdict; Visitor *v; BlockDriverState *bs = NULL; + BlockDriverState *data_bs = NULL; Error *local_err = NULL; const char *val; int ret; @@ -3228,6 +3274,26 @@ static int coroutine_fn qcow2_co_create_opts(const char *filename, QemuOpts *opt goto finish; } + /* Create and open an external data file (protocol layer) */ + val = qdict_get_try_str(qdict, BLOCK_OPT_DATA_FILE); + if (val) { + ret = bdrv_create_file(val, opts, errp); + if (ret < 0) { + goto finish; + } + + data_bs = bdrv_open(val, NULL, NULL, + BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, + errp); + if (data_bs == NULL) { + ret = -EIO; + goto finish; + } + + qdict_del(qdict, BLOCK_OPT_DATA_FILE); + qdict_put_str(qdict, "data-file", data_bs->node_name); + } + /* Set 'driver' and 'node' options */ qdict_put_str(qdict, "driver", "qcow2"); qdict_put_str(qdict, "file", bs->node_name); @@ -3262,6 +3328,7 @@ static int coroutine_fn qcow2_co_create_opts(const char *filename, QemuOpts *opt finish: qobject_unref(qdict); bdrv_unref(bs); + bdrv_unref(data_bs); qapi_free_BlockdevCreateOptions(create_options); return ret; } @@ -4552,6 +4619,8 @@ static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs, .refcount_bits = s->refcount_bits, .has_bitmaps = !!bitmaps, .bitmaps = bitmaps, + .has_data_file = !!s->image_data_file, + .data_file = g_strdup(s->image_data_file), }; } else { /* if this assertion fails, this probably means a new version was @@ -4754,7 +4823,7 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts, BDRVQcow2State *s = bs->opaque; int old_version = s->qcow_version, new_version = old_version; uint64_t new_size = 0; - const char *backing_file = NULL, *backing_format = NULL; + const char *backing_file = NULL, *backing_format = NULL, *data_file = NULL; bool lazy_refcounts = s->use_lazy_refcounts; const char *compat = NULL; uint64_t cluster_size = s->cluster_size; @@ -4836,6 +4905,13 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts, "may not exceed 64 bits"); return -EINVAL; } + } else if (!strcmp(desc->name, BLOCK_OPT_DATA_FILE)) { + data_file = qemu_opt_get(opts, BLOCK_OPT_DATA_FILE); + if (data_file && !has_data_file(bs)) { + error_setg(errp, "data-file can only be set for images that " + "use an external data file"); + return -EINVAL; + } } else { /* if this point is reached, this probably means a new option was * added without having it covered here */ @@ -4882,6 +4958,17 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts, } } + if (data_file) { + g_free(s->image_data_file); + s->image_data_file = *data_file ? g_strdup(data_file) : NULL; + } + + ret = qcow2_update_header(bs); + if (ret < 0) { + error_setg_errno(errp, -ret, "Failed to update the image header"); + return ret; + } + if (backing_file || backing_format) { ret = qcow2_change_backing_file(bs, backing_file ?: s->image_backing_file, @@ -5030,6 +5117,11 @@ static QemuOptsList qcow2_create_opts = { .help = "Image format of the base image" }, { + .name = BLOCK_OPT_DATA_FILE, + .type = QEMU_OPT_STRING, + .help = "File name of an external data file" + }, + { .name = BLOCK_OPT_ENCRYPT, .type = QEMU_OPT_BOOL, .help = "Encrypt the image with format 'aes'. (Deprecated " diff --git a/block/qcow2.h b/block/qcow2.h index f23c003..a9c9cb4 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -343,6 +343,7 @@ typedef struct BDRVQcow2State { * override) */ char *image_backing_file; char *image_backing_format; + char *image_data_file; CoQueue compress_wait_queue; int nb_compress_threads; diff --git a/qapi/block-core.json b/qapi/block-core.json index 2303266..e6faa94 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -59,6 +59,9 @@ # # @compat: compatibility level # +# @data-file: the filename of the external data file that is stored in the +# image and used as a default for opening the image (since: 4.0) +# # @lazy-refcounts: on or off; only valid for compat >= 1.1 # # @corrupt: true if the image has been marked corrupt; only valid for @@ -76,6 +79,7 @@ { 'struct': 'ImageInfoSpecificQCow2', 'data': { 'compat': 'str', + '*data-file': 'str', '*lazy-refcounts': 'bool', '*corrupt': 'bool', 'refcount-bits': 'int', @@ -3082,7 +3086,9 @@ # # @data-file: reference to or definition of the external data file. # This may only be specified for images that require an -# external data file. (since 4.0) +# external data file. If it is not specified for such +# an image, the data file name is loaded from the image +# file. (since 4.0) # # Since: 2.9 ## diff --git a/tests/qemu-iotests/082.out b/tests/qemu-iotests/082.out index 0ce18c0..7dc59f6 100644 --- a/tests/qemu-iotests/082.out +++ b/tests/qemu-iotests/082.out @@ -48,6 +48,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -69,6 +70,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -90,6 +92,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -111,6 +114,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -132,6 +136,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -153,6 +158,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -174,6 +180,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -195,6 +202,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -231,6 +239,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -304,6 +313,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -325,6 +335,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -346,6 +357,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -367,6 +379,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -388,6 +401,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -409,6 +423,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -430,6 +445,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -451,6 +467,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -487,6 +504,7 @@ Supported options: backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -568,6 +586,7 @@ Creation options for 'qcow2': backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -590,6 +609,7 @@ Creation options for 'qcow2': backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -612,6 +632,7 @@ Creation options for 'qcow2': backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -634,6 +655,7 @@ Creation options for 'qcow2': backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -656,6 +678,7 @@ Creation options for 'qcow2': backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -678,6 +701,7 @@ Creation options for 'qcow2': backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -700,6 +724,7 @@ Creation options for 'qcow2': backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -722,6 +747,7 @@ Creation options for 'qcow2': backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' @@ -761,6 +787,7 @@ Creation options for 'qcow2': backing_fmt=<str> - Image format of the base image cluster_size=<size> - qcow2 cluster size compat=<str> - Compatibility level (0.10 or 1.1) + data_file=<str> - File name of an external data file encrypt.cipher-alg=<str> - Name of encryption cipher algorithm encrypt.cipher-mode=<str> - Name of encryption cipher mode encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks' |