From 91a73a0f154a7d8f2c4949ea882f684d55c916e4 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 18 Oct 2013 08:14:47 +0200 Subject: [PATCH 22/81] block: look for zero blocks in bs->file RH-Author: Paolo Bonzini Message-id: <1382084091-16636-23-git-send-email-pbonzini@redhat.com> Patchwork-id: 55005 O-Subject: [RHEL 7.0 qemu-kvm PATCH 22/26] block: look for zero blocks in bs->file Bugzilla: 989646 RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Max Reitz RH-Acked-by: Kevin Wolf Reviewed-by: Eric Blake Signed-off-by: Paolo Bonzini (cherry picked from commit 5daa74a6ebce7543aaad178c4061dc087bb4c705) --- block.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) Signed-off-by: Miroslav Rezanina --- block.c | 16 +++++++++++++++- 1 files changed, 15 insertions(+), 1 deletions(-) diff --git a/block.c b/block.c index 2a4a9dd..f993b2e 100644 --- a/block.c +++ b/block.c @@ -3041,7 +3041,7 @@ static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, { int64_t length; int64_t n; - int64_t ret; + int64_t ret, ret2; length = bdrv_getlength(bs); if (length < 0) { @@ -3083,6 +3083,20 @@ static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, } } } + + if (bs->file && + (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && + (ret & BDRV_BLOCK_OFFSET_VALID)) { + ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, + *pnum, pnum); + if (ret2 >= 0) { + /* Ignore errors. This is just providing extra information, it + * is useful but not necessary. + */ + ret |= (ret2 & BDRV_BLOCK_ZERO); + } + } + return ret; } -- 1.7.1