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luks: Separate image file creation from formatting

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The crypto driver used to create the image file in a callback from the
crypto subsystem. If we want to implement .bdrv_co_create, this needs to
go away because that callback will get a reference to an already
existing block node.

Move the image file creation to block_crypto_create_generic().

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2018-03-02 11:48:45 +01:00
parent fb367e039f
commit 3b5a1f6aa4
1 changed files with 17 additions and 20 deletions
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37
block/crypto.c
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@ -71,8 +71,6 @@ static ssize_t block_crypto_read_func(QCryptoBlock *block,
struct BlockCryptoCreateData {
const char *filename;
QemuOpts *opts;
BlockBackend *blk;
uint64_t size;
};
@ -103,27 +101,13 @@ static ssize_t block_crypto_init_func(QCryptoBlock *block,
Error **errp)
{
struct BlockCryptoCreateData *data = opaque;
int ret;
/* User provided size should reflect amount of space made
* available to the guest, so we must take account of that
* which will be used by the crypto header
*/
data->size += headerlen;
qemu_opt_set_number(data->opts, BLOCK_OPT_SIZE, data->size, &error_abort);
ret = bdrv_create_file(data->filename, data->opts, errp);
if (ret < 0) {
return -1;
}
data->blk = blk_new_open(data->filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_PROTOCOL, errp);
if (!data->blk) {
return -1;
}
return 0;
return blk_truncate(data->blk, data->size + headerlen, PREALLOC_MODE_OFF,
errp);
}
@ -333,11 +317,10 @@ static int block_crypto_create_generic(QCryptoBlockFormat format,
struct BlockCryptoCreateData data = {
.size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
BDRV_SECTOR_SIZE),
.opts = opts,
.filename = filename,
};
QDict *cryptoopts;
/* Parse options */
cryptoopts = qemu_opts_to_qdict(opts, NULL);
create_opts = block_crypto_create_opts_init(format, cryptoopts, errp);
@ -345,6 +328,20 @@ static int block_crypto_create_generic(QCryptoBlockFormat format,
return -1;
}
/* Create protocol layer */
ret = bdrv_create_file(filename, opts, errp);
if (ret < 0) {
return ret;
}
data.blk = blk_new_open(filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
errp);
if (!data.blk) {
return -EINVAL;
}
/* Create format layer */
crypto = qcrypto_block_create(create_opts, NULL,
block_crypto_init_func,
block_crypto_write_func,