@@ -706,6 +706,7 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
bs->open_flags = flags;
bs->buffer_alignment = 512;
+ bs->zero_beyond_eof = true;
open_flags = bdrv_open_flags(bs, flags);
bs->read_only = !(open_flags & BDRV_O_RDWR);
@@ -1402,6 +1403,7 @@ void bdrv_close(BlockDriverState *bs)
bs->valid_key = 0;
bs->sg = 0;
bs->growable = 0;
+ bs->zero_beyond_eof = false;
QDECREF(bs->options);
bs->options = NULL;
@@ -1722,12 +1722,15 @@ static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf,
{
BDRVQcowState *s = bs->opaque;
int growable = bs->growable;
+ bool zero_beyond_eof = bs->zero_beyond_eof;
int ret;
BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD);
bs->growable = 1;
+ bs->zero_beyond_eof = false;
ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size);
bs->growable = growable;
+ bs->zero_beyond_eof = zero_beyond_eof;
return ret;
}
@@ -281,6 +281,9 @@ struct BlockDriverState {
/* Whether the disk can expand beyond total_sectors */
int growable;
+ /* Whether produces zeros when read beyond eof */
+ bool zero_beyond_eof;
+
/* the memory alignment required for the buffers handled by this driver */
int buffer_alignment;