diff options
Diffstat (limited to 'block/qcow2.c')
| -rw-r--r-- | block/qcow2.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/block/qcow2.c b/block/qcow2.c index 5c784eee51..d7805ce943 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -240,6 +240,7 @@ static int qcow2_open(BlockDriverState *bs, int flags) s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size + 512); s->cluster_cache_offset = -1; + s->flags = flags; ret = qcow2_refcount_init(bs); if (ret != 0) { @@ -632,6 +633,37 @@ static void qcow2_close(BlockDriverState *bs) qcow2_refcount_close(bs); } +static void qcow2_invalidate_cache(BlockDriverState *bs) +{ + BDRVQcowState *s = bs->opaque; + int flags = s->flags; + AES_KEY aes_encrypt_key; + AES_KEY aes_decrypt_key; + uint32_t crypt_method = 0; + + /* + * Backing files are read-only which makes all of their metadata immutable, + * that means we don't have to worry about reopening them here. + */ + + if (s->crypt_method) { + crypt_method = s->crypt_method; + memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); + memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); + } + + qcow2_close(bs); + + memset(s, 0, sizeof(BDRVQcowState)); + qcow2_open(bs, flags); + + if (crypt_method) { + s->crypt_method = crypt_method; + memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); + memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); + } +} + /* * Updates the variable length parts of the qcow2 header, i.e. the backing file * name and all extensions. qcow2 was not designed to allow such changes, so if @@ -1269,6 +1301,8 @@ static BlockDriver bdrv_qcow2 = { .bdrv_change_backing_file = qcow2_change_backing_file, + .bdrv_invalidate_cache = qcow2_invalidate_cache, + .create_options = qcow2_create_options, .bdrv_check = qcow2_check, }; |