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LUKS: support preallocation 

preallocation=off and preallocation=metadata
both allocate luks header only, and preallocation=falloc/full
is passed to underlying file.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1534951

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-id: 20190716161901.1430-1-mlevitsk@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Maxim Levitsky 2019-07-16 19:19:01 +03:00 committed by Max Reitz
parent 3fbd3405d2
commit 672de729a1
2 changed files with 32 additions and 4 deletions

30
block/crypto.c
View File

@ -74,6 +74,7 @@ static ssize_t block_crypto_read_func(QCryptoBlock *block,
struct BlockCryptoCreateData {
BlockBackend *blk;
uint64_t size;
PreallocMode prealloc;
};
@ -112,7 +113,7 @@ static ssize_t block_crypto_init_func(QCryptoBlock *block,
* available to the guest, so we must take account of that
* which will be used by the crypto header
*/
return blk_truncate(data->blk, data->size + headerlen, PREALLOC_MODE_OFF,
return blk_truncate(data->blk, data->size + headerlen, data->prealloc,
errp);
}
@ -251,6 +252,7 @@ static int block_crypto_open_generic(QCryptoBlockFormat format,
static int block_crypto_co_create_generic(BlockDriverState *bs,
int64_t size,
QCryptoBlockCreateOptions *opts,
PreallocMode prealloc,
Error **errp)
{
int ret;
@ -266,9 +268,14 @@ static int block_crypto_co_create_generic(BlockDriverState *bs,
goto cleanup;
}
if (prealloc == PREALLOC_MODE_METADATA) {
prealloc = PREALLOC_MODE_OFF;
}
data = (struct BlockCryptoCreateData) {
.blk = blk,
.size = size,
.prealloc = prealloc,
};
crypto = qcrypto_block_create(opts, NULL,
@ -500,6 +507,7 @@ block_crypto_co_create_luks(BlockdevCreateOptions *create_options, Error **errp)
BlockdevCreateOptionsLUKS *luks_opts;
BlockDriverState *bs = NULL;
QCryptoBlockCreateOptions create_opts;
PreallocMode preallocation = PREALLOC_MODE_OFF;
int ret;
assert(create_options->driver == BLOCKDEV_DRIVER_LUKS);
@ -515,8 +523,12 @@ block_crypto_co_create_luks(BlockdevCreateOptions *create_options, Error **errp)
.u.luks = *qapi_BlockdevCreateOptionsLUKS_base(luks_opts),
};
if (luks_opts->has_preallocation) {
preallocation = luks_opts->preallocation;
}
ret = block_crypto_co_create_generic(bs, luks_opts->size, &create_opts,
errp);
preallocation, errp);
if (ret < 0) {
goto fail;
}
@ -534,12 +546,24 @@ static int coroutine_fn block_crypto_co_create_opts_luks(const char *filename,
QCryptoBlockCreateOptions *create_opts = NULL;
BlockDriverState *bs = NULL;
QDict *cryptoopts;
PreallocMode prealloc;
char *buf = NULL;
int64_t size;
int ret;
Error *local_err = NULL;
/* Parse options */
size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
prealloc = qapi_enum_parse(&PreallocMode_lookup, buf,
PREALLOC_MODE_OFF, &local_err);
g_free(buf);
if (local_err) {
error_propagate(errp, local_err);
return -EINVAL;
}
cryptoopts = qemu_opts_to_qdict_filtered(opts, NULL,
&block_crypto_create_opts_luks,
true);
@ -565,7 +589,7 @@ static int coroutine_fn block_crypto_co_create_opts_luks(const char *filename,
}
/* Create format layer */
ret = block_crypto_co_create_generic(bs, size, create_opts, errp);
ret = block_crypto_co_create_generic(bs, size, create_opts, prealloc, errp);
if (ret < 0) {
goto fail;
}

6
qapi/block-core.json
View File

@ -4212,13 +4212,17 @@
#
# @file Node to create the image format on
# @size Size of the virtual disk in bytes
# @preallocation Preallocation mode for the new image
# (since: 4.2)
# (default: off; allowed values: off, metadata, falloc, full)
#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsLUKS',
'base': 'QCryptoBlockCreateOptionsLUKS',
'data': { 'file': 'BlockdevRef',
'size': 'size' } }
'size': 'size',
'*preallocation': 'PreallocMode' } }
##
# @BlockdevCreateOptionsNfs: