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authorStefan Hajnoczi <stefanha@redhat.com>2020-02-21 11:25:20 +0000
committerMax Reitz <mreitz@redhat.com>2020-03-11 12:42:29 +0100
commita9da6e49d8281e65d172ed843807a613651d4ef3 (patch)
tree893fd4ebe1bd9fb1a8336beea3d805686d7e4cb9
parent6d49d3a859b0f19226dbb0df5e7f50267b42f45c (diff)
downloadqemu-arm-a9da6e49d8281e65d172ed843807a613651d4ef3.tar.gz
luks: implement .bdrv_measure()
Add qemu-img measure support in the "luks" block driver. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200221112522.1497712-3-stefanha@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
-rw-r--r--block/crypto.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/block/crypto.c b/block/crypto.c
index 24823835c1..23e9c74d6f 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -484,6 +484,67 @@ static int64_t block_crypto_getlength(BlockDriverState *bs)
}
+static BlockMeasureInfo *block_crypto_measure(QemuOpts *opts,
+ BlockDriverState *in_bs,
+ Error **errp)
+{
+ g_autoptr(QCryptoBlockCreateOptions) create_opts = NULL;
+ Error *local_err = NULL;
+ BlockMeasureInfo *info;
+ uint64_t size;
+ size_t luks_payload_size;
+ QDict *cryptoopts;
+
+ /*
+ * Preallocation mode doesn't affect size requirements but we must consume
+ * the option.
+ */
+ g_free(qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC));
+
+ size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
+
+ if (in_bs) {
+ int64_t ssize = bdrv_getlength(in_bs);
+
+ if (ssize < 0) {
+ error_setg_errno(&local_err, -ssize,
+ "Unable to get image virtual_size");
+ goto err;
+ }
+
+ size = ssize;
+ }
+
+ cryptoopts = qemu_opts_to_qdict_filtered(opts, NULL,
+ &block_crypto_create_opts_luks, true);
+ qdict_put_str(cryptoopts, "format", "luks");
+ create_opts = block_crypto_create_opts_init(cryptoopts, &local_err);
+ qobject_unref(cryptoopts);
+ if (!create_opts) {
+ goto err;
+ }
+
+ if (!qcrypto_block_calculate_payload_offset(create_opts, NULL,
+ &luks_payload_size,
+ &local_err)) {
+ goto err;
+ }
+
+ /*
+ * Unallocated blocks are still encrypted so allocation status makes no
+ * difference to the file size.
+ */
+ info = g_new(BlockMeasureInfo, 1);
+ info->fully_allocated = luks_payload_size + size;
+ info->required = luks_payload_size + size;
+ return info;
+
+err:
+ error_propagate(errp, local_err);
+ return NULL;
+}
+
+
static int block_crypto_probe_luks(const uint8_t *buf,
int buf_size,
const char *filename) {
@@ -670,6 +731,7 @@ static BlockDriver bdrv_crypto_luks = {
.bdrv_co_preadv = block_crypto_co_preadv,
.bdrv_co_pwritev = block_crypto_co_pwritev,
.bdrv_getlength = block_crypto_getlength,
+ .bdrv_measure = block_crypto_measure,
.bdrv_get_info = block_crypto_get_info_luks,
.bdrv_get_specific_info = block_crypto_get_specific_info_luks,