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[Qemu-devel] [PATCHv3 17/20] block/get_block_status: fix BDRV_BLOCK_ZERO
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCHv3 17/20] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks |
Date: |
Tue, 24 Sep 2013 15:35:11 +0200 |
this patch does 2 things:
a) only do additional call outs if BDRV_BLOCK_ZERO is not already set.
b) use the newly introduced bdrv_has_discard_zeroes() to return the
zero state of an unallocated block. the used callout to
bdrv_has_zero_init() is only valid right after bdrv_create.
Reviewed-by: Eric Blake <address@hidden>
Signed-off-by: Peter Lieven <address@hidden>
---
block.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/block.c b/block.c
index f56660d..032809a 100644
--- a/block.c
+++ b/block.c
@@ -3263,8 +3263,8 @@ static int64_t coroutine_fn
bdrv_co_get_block_status(BlockDriverState *bs,
return ret;
}
- if (!(ret & BDRV_BLOCK_DATA)) {
- if (bdrv_has_zero_init(bs)) {
+ if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) {
+ if (bdrv_has_discard_zeroes(bs)) {
ret |= BDRV_BLOCK_ZERO;
} else if (bs->backing_hd) {
BlockDriverState *bs2 = bs->backing_hd;
--
1.7.9.5
- [Qemu-devel] [PATCHv3 11/20] iscsi: add bdrv_has_discard_zeroes and bdrv_has_discard_write_zeroes, (continued)
- [Qemu-devel] [PATCHv3 11/20] iscsi: add bdrv_has_discard_zeroes and bdrv_has_discard_write_zeroes, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 13/20] block: introduce bdrv_zeroize, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 12/20] iscsi: add bdrv_co_write_zeroes, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 10/20] iscsi: set limits in BlockDriverState, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 14/20] block/get_block_status: set *pnum = 0 on error, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 09/20] iscsi: simplify iscsi_co_discard, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 16/20] block/get_block_status: avoid redundant callouts on raw devices, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 18/20] qemu-img: add support for fully allocated images, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 20/20] block/raw: copy BlockLimits on raw_open, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 15/20] block/get_block_status: avoid segfault if there is no backing_hd, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 17/20] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks,
Peter Lieven <=
- [Qemu-devel] [PATCHv3 19/20] qemu-img: conditionally zero out target on convert, Peter Lieven, 2013/09/24