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https://github.com/xemu-project/xemu.git
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qcow2: Implement data-file-raw create option
Provide an option to force QEMU to always keep the external data file consistent as a standalone read-only raw image. At the moment, this means making sure that write_zeroes requests are forwarded to the data file instead of just updating the metadata, and checking that no backing file is used. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf
parent
9b890bdcb6
commit
6c3944dc62
@ -1783,6 +1783,16 @@ int qcow2_cluster_zeroize(BlockDriverState *bs, uint64_t offset,
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int64_t cleared;
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int ret;
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/* If we have to stay in sync with an external data file, zero out
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* s->data_file first. */
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if (data_file_is_raw(bs)) {
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assert(has_data_file(bs));
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ret = bdrv_co_pwrite_zeroes(s->data_file, offset, bytes, flags);
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if (ret < 0) {
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return ret;
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}
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}
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/* Caller must pass aligned values, except at image end */
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assert(QEMU_IS_ALIGNED(offset, s->cluster_size));
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assert(QEMU_IS_ALIGNED(end_offset, s->cluster_size) ||
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@ -1498,8 +1498,14 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
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"external data file");
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ret = -EINVAL;
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goto fail;
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} else {
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s->data_file = bs->file;
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}
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s->data_file = bs->file;
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if (data_file_is_raw(bs)) {
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error_setg(errp, "data-file-raw requires a data file");
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ret = -EINVAL;
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goto fail;
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}
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}
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@ -2606,6 +2612,12 @@ static int qcow2_change_backing_file(BlockDriverState *bs,
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{
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BDRVQcow2State *s = bs->opaque;
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/* Adding a backing file means that the external data file alone won't be
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* enough to make sense of the content */
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if (backing_file && data_file_is_raw(bs)) {
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return -EINVAL;
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}
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if (backing_file && strlen(backing_file) > 1023) {
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return -EINVAL;
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}
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@ -3016,6 +3028,18 @@ qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp)
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}
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refcount_order = ctz32(qcow2_opts->refcount_bits);
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if (qcow2_opts->data_file_raw && !qcow2_opts->data_file) {
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error_setg(errp, "data-file-raw requires data-file");
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ret = -EINVAL;
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goto out;
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}
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if (qcow2_opts->data_file_raw && qcow2_opts->has_backing_file) {
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error_setg(errp, "Backing file and data-file-raw cannot be used at "
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"the same time");
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ret = -EINVAL;
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goto out;
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}
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if (qcow2_opts->data_file) {
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if (version < 3) {
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error_setg(errp, "External data files are only supported with "
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@ -3072,6 +3096,10 @@ qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp)
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header->incompatible_features |=
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cpu_to_be64(QCOW2_INCOMPAT_DATA_FILE);
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}
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if (qcow2_opts->data_file_raw) {
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header->autoclear_features |=
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cpu_to_be64(QCOW2_AUTOCLEAR_DATA_FILE_RAW);
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}
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ret = blk_pwrite(blk, 0, header, cluster_size, 0);
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g_free(header);
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@ -3253,6 +3281,7 @@ static int coroutine_fn qcow2_co_create_opts(const char *filename, QemuOpts *opt
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{ BLOCK_OPT_REFCOUNT_BITS, "refcount-bits" },
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{ BLOCK_OPT_ENCRYPT, BLOCK_OPT_ENCRYPT_FORMAT },
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{ BLOCK_OPT_COMPAT_LEVEL, "version" },
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{ BLOCK_OPT_DATA_FILE_RAW, "data-file-raw" },
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{ NULL, NULL },
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};
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@ -4621,6 +4650,8 @@ static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs,
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.bitmaps = bitmaps,
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.has_data_file = !!s->image_data_file,
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.data_file = g_strdup(s->image_data_file),
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.has_data_file_raw = has_data_file(bs),
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.data_file_raw = data_file_is_raw(bs),
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};
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} else {
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/* if this assertion fails, this probably means a new version was
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@ -4825,6 +4856,7 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts,
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uint64_t new_size = 0;
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const char *backing_file = NULL, *backing_format = NULL, *data_file = NULL;
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bool lazy_refcounts = s->use_lazy_refcounts;
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bool data_file_raw = data_file_is_raw(bs);
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const char *compat = NULL;
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uint64_t cluster_size = s->cluster_size;
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bool encrypt;
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@ -4912,6 +4944,14 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts,
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"use an external data file");
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return -EINVAL;
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}
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} else if (!strcmp(desc->name, BLOCK_OPT_DATA_FILE_RAW)) {
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data_file_raw = qemu_opt_get_bool(opts, BLOCK_OPT_DATA_FILE_RAW,
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data_file_raw);
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if (data_file_raw && !data_file_is_raw(bs)) {
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error_setg(errp, "data-file-raw cannot be set on existing "
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"images");
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return -EINVAL;
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}
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} else {
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/* if this point is reached, this probably means a new option was
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* added without having it covered here */
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@ -4958,6 +4998,13 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts,
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}
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}
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/* data-file-raw blocks backing files, so clear it first if requested */
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if (data_file_raw) {
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s->autoclear_features |= QCOW2_AUTOCLEAR_DATA_FILE_RAW;
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} else {
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s->autoclear_features &= ~QCOW2_AUTOCLEAR_DATA_FILE_RAW;
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}
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if (data_file) {
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g_free(s->image_data_file);
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s->image_data_file = *data_file ? g_strdup(data_file) : NULL;
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@ -5121,6 +5168,11 @@ static QemuOptsList qcow2_create_opts = {
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.type = QEMU_OPT_STRING,
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.help = "File name of an external data file"
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},
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{
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.name = BLOCK_OPT_DATA_FILE_RAW,
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.type = QEMU_OPT_BOOL,
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.help = "The external data file must stay valid as a raw image"
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},
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{
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.name = BLOCK_OPT_ENCRYPT,
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.type = QEMU_OPT_BOOL,
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@ -225,7 +225,8 @@ enum {
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QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR,
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QCOW2_AUTOCLEAR_DATA_FILE_RAW = 1 << QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR,
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QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS,
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QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS
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| QCOW2_AUTOCLEAR_DATA_FILE_RAW,
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};
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enum qcow2_discard_type {
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@ -474,6 +475,12 @@ static inline bool has_data_file(BlockDriverState *bs)
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return (s->data_file != bs->file);
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}
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static inline bool data_file_is_raw(BlockDriverState *bs)
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{
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BDRVQcow2State *s = bs->opaque;
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return !!(s->autoclear_features & QCOW2_AUTOCLEAR_DATA_FILE_RAW);
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}
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static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset)
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{
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return offset & ~(s->cluster_size - 1);
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@ -57,6 +57,7 @@
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#define BLOCK_OPT_OBJECT_SIZE "object_size"
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#define BLOCK_OPT_REFCOUNT_BITS "refcount_bits"
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#define BLOCK_OPT_DATA_FILE "data_file"
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#define BLOCK_OPT_DATA_FILE_RAW "data_file_raw"
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#define BLOCK_PROBE_BUF_SIZE 512
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@ -62,6 +62,10 @@
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# @data-file: the filename of the external data file that is stored in the
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# image and used as a default for opening the image (since: 4.0)
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#
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# @data-file-raw: True if the external data file must stay valid as a
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# standalone (read-only) raw image without looking at qcow2
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# metadata (since: 4.0)
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#
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# @lazy-refcounts: on or off; only valid for compat >= 1.1
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#
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# @corrupt: true if the image has been marked corrupt; only valid for
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@ -80,6 +84,7 @@
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'data': {
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'compat': 'str',
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'*data-file': 'str',
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'*data-file-raw': 'bool',
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'*lazy-refcounts': 'bool',
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'*corrupt': 'bool',
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'refcount-bits': 'int',
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@ -4144,6 +4149,9 @@
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# @data-file Node to use as an external data file in which all guest
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# data is stored so that only metadata remains in the qcow2
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# file (since: 4.0)
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# @data-file-raw True if the external data file must stay valid as a
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# standalone (read-only) raw image without looking at qcow2
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# metadata (default: false; since: 4.0)
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# @size Size of the virtual disk in bytes
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# @version Compatibility level (default: v3)
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# @backing-file File name of the backing file if a backing file
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@ -4160,6 +4168,7 @@
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{ 'struct': 'BlockdevCreateOptionsQcow2',
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'data': { 'file': 'BlockdevRef',
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'*data-file': 'BlockdevRef',
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'*data-file-raw': 'bool',
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'size': 'size',
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'*version': 'BlockdevQcow2Version',
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'*backing-file': 'str',
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@ -49,6 +49,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -71,6 +72,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -93,6 +95,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -115,6 +118,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -137,6 +141,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -159,6 +164,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -181,6 +187,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -203,6 +210,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -240,6 +248,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -314,6 +323,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -336,6 +346,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -358,6 +369,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -380,6 +392,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -402,6 +415,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -424,6 +438,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -446,6 +461,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -468,6 +484,7 @@ Supported options:
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cluster_size=<size> - qcow2 cluster size
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compat=<str> - Compatibility level (0.10 or 1.1)
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data_file=<str> - File name of an external data file
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data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
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encrypt.cipher-alg=<str> - Name of encryption cipher algorithm
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encrypt.cipher-mode=<str> - Name of encryption cipher mode
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encrypt.format=<str> - Encrypt the image, format choices: 'aes', 'luks'
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@ -505,6 +522,7 @@ Supported options:
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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
|
||||
data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
|
||||
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'
|
||||
@ -587,6 +605,7 @@ Creation options for 'qcow2':
|
||||
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
|
||||
data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
|
||||
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'
|
||||
@ -610,6 +629,7 @@ Creation options for 'qcow2':
|
||||
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
|
||||
data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
|
||||
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'
|
||||
@ -633,6 +653,7 @@ Creation options for 'qcow2':
|
||||
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
|
||||
data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
|
||||
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 +677,7 @@ Creation options for 'qcow2':
|
||||
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
|
||||
data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
|
||||
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'
|
||||
@ -679,6 +701,7 @@ Creation options for 'qcow2':
|
||||
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
|
||||
data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
|
||||
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'
|
||||
@ -702,6 +725,7 @@ Creation options for 'qcow2':
|
||||
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
|
||||
data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
|
||||
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'
|
||||
@ -725,6 +749,7 @@ Creation options for 'qcow2':
|
||||
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
|
||||
data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
|
||||
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'
|
||||
@ -748,6 +773,7 @@ Creation options for 'qcow2':
|
||||
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
|
||||
data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
|
||||
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'
|
||||
@ -788,6 +814,7 @@ Creation options for 'qcow2':
|
||||
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
|
||||
data_file_raw=<bool (on/off)> - The external data file must stay valid as a raw image
|
||||
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'
|
||||
|
||||
Loading…
Reference in New Issue
Block a user