mirror of https://github.com/xemu-project/xemu.git
qcow: Support .bdrv_co_create
This adds the .bdrv_co_create driver callback to qcow, which enables image creation over QMP. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
Kevin Wolf
parent
e1473133f7
commit
42a3e1ab36
198
block/qcow.c
198
block/qcow.c
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@ -33,6 +33,8 @@
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#include <zlib.h>
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qstring.h"
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#include "qapi/qobject-input-visitor.h"
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#include "qapi/qapi-visit-block-core.h"
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#include "crypto/block.h"
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#include "migration/blocker.h"
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#include "block/crypto.h"
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@ -86,6 +88,8 @@ typedef struct BDRVQcowState {
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Error *migration_blocker;
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} BDRVQcowState;
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static QemuOptsList qcow_create_opts;
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static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
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static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
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@ -810,62 +814,50 @@ static void qcow_close(BlockDriverState *bs)
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error_free(s->migration_blocker);
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}
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static int coroutine_fn qcow_co_create_opts(const char *filename, QemuOpts *opts,
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Error **errp)
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static int coroutine_fn qcow_co_create(BlockdevCreateOptions *opts,
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Error **errp)
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{
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BlockdevCreateOptionsQcow *qcow_opts;
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int header_size, backing_filename_len, l1_size, shift, i;
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QCowHeader header;
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uint8_t *tmp;
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int64_t total_size = 0;
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char *backing_file = NULL;
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Error *local_err = NULL;
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int ret;
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BlockDriverState *bs;
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BlockBackend *qcow_blk;
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char *encryptfmt = NULL;
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QDict *options;
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QDict *encryptopts = NULL;
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QCryptoBlockCreateOptions *crypto_opts = NULL;
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QCryptoBlock *crypto = NULL;
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/* Read out options */
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total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
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BDRV_SECTOR_SIZE);
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assert(opts->driver == BLOCKDEV_DRIVER_QCOW);
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qcow_opts = &opts->u.qcow;
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/* Sanity checks */
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total_size = qcow_opts->size;
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if (total_size == 0) {
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error_setg(errp, "Image size is too small, cannot be zero length");
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ret = -EINVAL;
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goto cleanup;
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return -EINVAL;
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}
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backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
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encryptfmt = qemu_opt_get_del(opts, BLOCK_OPT_ENCRYPT_FORMAT);
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if (encryptfmt) {
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if (qemu_opt_get(opts, BLOCK_OPT_ENCRYPT)) {
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error_setg(errp, "Options " BLOCK_OPT_ENCRYPT " and "
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BLOCK_OPT_ENCRYPT_FORMAT " are mutually exclusive");
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ret = -EINVAL;
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goto cleanup;
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}
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} else if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ENCRYPT, false)) {
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encryptfmt = g_strdup("aes");
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if (qcow_opts->has_encrypt &&
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qcow_opts->encrypt->format != Q_CRYPTO_BLOCK_FORMAT_QCOW)
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{
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error_setg(errp, "Unsupported encryption format");
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return -EINVAL;
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}
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ret = bdrv_create_file(filename, opts, &local_err);
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/* Create BlockBackend to write to the image */
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bs = bdrv_open_blockdev_ref(qcow_opts->file, errp);
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if (bs == NULL) {
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return -EIO;
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}
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qcow_blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL);
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ret = blk_insert_bs(qcow_blk, bs, errp);
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if (ret < 0) {
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error_propagate(errp, local_err);
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goto cleanup;
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goto exit;
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}
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qcow_blk = blk_new_open(filename, NULL, NULL,
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BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
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&local_err);
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if (qcow_blk == NULL) {
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error_propagate(errp, local_err);
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ret = -EIO;
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goto cleanup;
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}
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blk_set_allow_write_beyond_eof(qcow_blk, true);
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/* Create image format */
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ret = blk_truncate(qcow_blk, 0, PREALLOC_MODE_OFF, errp);
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if (ret < 0) {
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goto exit;
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@ -877,16 +869,15 @@ static int coroutine_fn qcow_co_create_opts(const char *filename, QemuOpts *opts
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header.size = cpu_to_be64(total_size);
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header_size = sizeof(header);
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backing_filename_len = 0;
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if (backing_file) {
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if (strcmp(backing_file, "fat:")) {
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if (qcow_opts->has_backing_file) {
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if (strcmp(qcow_opts->backing_file, "fat:")) {
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header.backing_file_offset = cpu_to_be64(header_size);
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backing_filename_len = strlen(backing_file);
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backing_filename_len = strlen(qcow_opts->backing_file);
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header.backing_file_size = cpu_to_be32(backing_filename_len);
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header_size += backing_filename_len;
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} else {
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/* special backing file for vvfat */
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g_free(backing_file);
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backing_file = NULL;
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qcow_opts->has_backing_file = false;
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}
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header.cluster_bits = 9; /* 512 byte cluster to avoid copying
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unmodified sectors */
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@ -901,26 +892,10 @@ static int coroutine_fn qcow_co_create_opts(const char *filename, QemuOpts *opts
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header.l1_table_offset = cpu_to_be64(header_size);
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options = qemu_opts_to_qdict(opts, NULL);
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qdict_extract_subqdict(options, &encryptopts, "encrypt.");
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QDECREF(options);
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if (encryptfmt) {
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if (!g_str_equal(encryptfmt, "aes")) {
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error_setg(errp, "Unknown encryption format '%s', expected 'aes'",
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encryptfmt);
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ret = -EINVAL;
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goto exit;
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}
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if (qcow_opts->has_encrypt) {
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header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES);
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crypto_opts = block_crypto_create_opts_init(
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Q_CRYPTO_BLOCK_FORMAT_QCOW, encryptopts, errp);
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if (!crypto_opts) {
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ret = -EINVAL;
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goto exit;
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}
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crypto = qcrypto_block_create(crypto_opts, "encrypt.",
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crypto = qcrypto_block_create(qcow_opts->encrypt, "encrypt.",
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NULL, NULL, NULL, errp);
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if (!crypto) {
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ret = -EINVAL;
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@ -936,9 +911,9 @@ static int coroutine_fn qcow_co_create_opts(const char *filename, QemuOpts *opts
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goto exit;
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}
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if (backing_file) {
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if (qcow_opts->has_backing_file) {
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ret = blk_pwrite(qcow_blk, sizeof(header),
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backing_file, backing_filename_len, 0);
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qcow_opts->backing_file, backing_filename_len, 0);
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if (ret != backing_filename_len) {
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goto exit;
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}
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@ -959,12 +934,100 @@ static int coroutine_fn qcow_co_create_opts(const char *filename, QemuOpts *opts
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ret = 0;
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exit:
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blk_unref(qcow_blk);
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cleanup:
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QDECREF(encryptopts);
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g_free(encryptfmt);
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qcrypto_block_free(crypto);
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qapi_free_QCryptoBlockCreateOptions(crypto_opts);
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g_free(backing_file);
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return ret;
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}
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static int coroutine_fn qcow_co_create_opts(const char *filename,
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QemuOpts *opts, Error **errp)
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{
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BlockdevCreateOptions *create_options = NULL;
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BlockDriverState *bs = NULL;
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QDict *qdict = NULL;
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QObject *qobj;
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Visitor *v;
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const char *val;
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Error *local_err = NULL;
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int ret;
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static const QDictRenames opt_renames[] = {
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{ BLOCK_OPT_BACKING_FILE, "backing-file" },
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{ BLOCK_OPT_ENCRYPT, BLOCK_OPT_ENCRYPT_FORMAT },
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{ NULL, NULL },
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};
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/* Parse options and convert legacy syntax */
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qdict = qemu_opts_to_qdict_filtered(opts, NULL, &qcow_create_opts, true);
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val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT);
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if (val && !strcmp(val, "on")) {
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qdict_put_str(qdict, BLOCK_OPT_ENCRYPT, "qcow");
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} else if (val && !strcmp(val, "off")) {
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qdict_del(qdict, BLOCK_OPT_ENCRYPT);
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}
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val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT);
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if (val && !strcmp(val, "aes")) {
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qdict_put_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT, "qcow");
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}
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if (!qdict_rename_keys(qdict, opt_renames, errp)) {
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ret = -EINVAL;
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goto fail;
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}
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/* Create and open the file (protocol layer) */
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ret = bdrv_create_file(filename, opts, &local_err);
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if (ret < 0) {
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error_propagate(errp, local_err);
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goto fail;
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}
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bs = bdrv_open(filename, NULL, NULL,
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BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
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if (bs == NULL) {
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ret = -EIO;
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goto fail;
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}
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/* Now get the QAPI type BlockdevCreateOptions */
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qdict_put_str(qdict, "driver", "qcow");
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qdict_put_str(qdict, "file", bs->node_name);
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qobj = qdict_crumple(qdict, errp);
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QDECREF(qdict);
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qdict = qobject_to_qdict(qobj);
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if (qdict == NULL) {
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ret = -EINVAL;
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goto fail;
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}
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v = qobject_input_visitor_new_keyval(QOBJECT(qdict));
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visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err);
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visit_free(v);
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if (local_err) {
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error_propagate(errp, local_err);
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ret = -EINVAL;
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goto fail;
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}
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/* Silently round up size */
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assert(create_options->driver == BLOCKDEV_DRIVER_QCOW);
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create_options->u.qcow.size =
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ROUND_UP(create_options->u.qcow.size, BDRV_SECTOR_SIZE);
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/* Create the qcow image (format layer) */
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ret = qcow_co_create(create_options, errp);
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if (ret < 0) {
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goto fail;
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}
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ret = 0;
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fail:
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QDECREF(qdict);
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bdrv_unref(bs);
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qapi_free_BlockdevCreateOptions(create_options);
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return ret;
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}
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@ -1128,6 +1191,7 @@ static BlockDriver bdrv_qcow = {
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.bdrv_close = qcow_close,
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.bdrv_child_perm = bdrv_format_default_perms,
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.bdrv_reopen_prepare = qcow_reopen_prepare,
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.bdrv_co_create = qcow_co_create,
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.bdrv_co_create_opts = qcow_co_create_opts,
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.bdrv_has_zero_init = bdrv_has_zero_init_1,
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.supports_backing = true,
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@ -3643,6 +3643,25 @@
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'size': 'size',
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'*cluster-size': 'size' } }
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##
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# @BlockdevCreateOptionsQcow:
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#
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# Driver specific image creation options for qcow.
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#
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# @file Node to create the image format on
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# @size Size of the virtual disk in bytes
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# @backing-file File name of the backing file if a backing file
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# should be used
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# @encrypt Encryption options if the image should be encrypted
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#
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# Since: 2.12
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##
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{ 'struct': 'BlockdevCreateOptionsQcow',
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'data': { 'file': 'BlockdevRef',
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'size': 'size',
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'*backing-file': 'str',
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'*encrypt': 'QCryptoBlockCreateOptions' } }
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##
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# @BlockdevQcow2Version:
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#
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@ -3846,8 +3865,8 @@
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'null-co': 'BlockdevCreateNotSupported',
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'nvme': 'BlockdevCreateNotSupported',
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'parallels': 'BlockdevCreateOptionsParallels',
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'qcow': 'BlockdevCreateOptionsQcow',
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'qcow2': 'BlockdevCreateOptionsQcow2',
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'qcow': 'BlockdevCreateNotSupported',
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'qed': 'BlockdevCreateNotSupported',
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'quorum': 'BlockdevCreateNotSupported',
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'raw': 'BlockdevCreateNotSupported',
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