From a9d1e9daa5527101c0b2dcf1a57aab549075144a Mon Sep 17 00:00:00 2001 From: Jeff Cody Date: Mon, 8 Dec 2014 01:07:43 -0500 Subject: block: vhdx - update PAYLOAD_BLOCK_UNMAPPED value to match 1.00 spec The 0.95 VHDX spec defined PAYLOAD_BLOCK_UNMAPPED to be 5. The 1.00 VHDX spec redefines PAYLOAD_BLOCK_UNMAPPED to be 3 instead. The original value of 5 is now an undefined state in the spec, but it should be safe to treat it the same and return zeros for data read. This way, we can maintain compatibility with any images out in the wild that may have been created in accordance to the 0.95 spec. Reported-by: Kevin Wolf Signed-off-by: Jeff Cody Reviewed-by: Max Reitz Message-id: 8a4d2da73a8dbc04cde62bea782fc09ff84b1cf1.1418018421.git.jcody@redhat.com Signed-off-by: Stefan Hajnoczi --- block/vhdx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'block/vhdx.c') diff --git a/block/vhdx.c b/block/vhdx.c index f1e1e2e..bec10bd 100644 --- a/block/vhdx.c +++ b/block/vhdx.c @@ -1111,6 +1111,7 @@ static coroutine_fn int vhdx_co_readv(BlockDriverState *bs, int64_t sector_num, case PAYLOAD_BLOCK_NOT_PRESENT: /* fall through */ case PAYLOAD_BLOCK_UNDEFINED: case PAYLOAD_BLOCK_UNMAPPED: + case PAYLOAD_BLOCK_UNMAPPED_v095: case PAYLOAD_BLOCK_ZERO: /* return zero */ qemu_iovec_memset(&hd_qiov, 0, 0, sinfo.bytes_avail); @@ -1277,10 +1278,10 @@ static coroutine_fn int vhdx_co_writev(BlockDriverState *bs, int64_t sector_num, sectors_to_write += iov2.iov_len >> BDRV_SECTOR_BITS; } } - /* fall through */ case PAYLOAD_BLOCK_NOT_PRESENT: /* fall through */ case PAYLOAD_BLOCK_UNMAPPED: + case PAYLOAD_BLOCK_UNMAPPED_v095: case PAYLOAD_BLOCK_UNDEFINED: bat_prior_offset = sinfo.file_offset; ret = vhdx_allocate_block(bs, s, &sinfo.file_offset); -- cgit v1.1