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[Qemu-devel] [PATCHv5 05/17] block: add wrappers for logical block provi
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCHv5 05/17] block: add wrappers for logical block provisioning information |
Date: |
Sun, 20 Oct 2013 17:42:59 +0200 |
This adds 2 wrappers to read the unallocated_blocks_are_zero and
can_write_zeroes_with_unmap info from the BDI. The wrappers are
required to check for the existence of a backing_hd and
if the devices are opened with the correct flags.
Signed-off-by: Peter Lieven <address@hidden>
---
block.c | 30 ++++++++++++++++++++++++++++++
include/block/block.h | 2 ++
2 files changed, 32 insertions(+)
diff --git a/block.c b/block.c
index 0d97ce6..0601b02 100644
--- a/block.c
+++ b/block.c
@@ -3094,6 +3094,36 @@ int bdrv_has_zero_init(BlockDriverState *bs)
return 0;
}
+bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs)
+{
+ BlockDriverInfo bdi;
+
+ if (bs->backing_hd) {
+ return false;
+ }
+
+ if (bdrv_get_info(bs, &bdi) == 0) {
+ return bdi.unallocated_blocks_are_zero;
+ }
+
+ return false;
+}
+
+bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs)
+{
+ BlockDriverInfo bdi;
+
+ if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) {
+ return false;
+ }
+
+ if (bdrv_get_info(bs, &bdi) == 0) {
+ return bdi.can_write_zeroes_with_unmap;
+ }
+
+ return false;
+}
+
typedef struct BdrvCoGetBlockStatusData {
BlockDriverState *bs;
BlockDriverState *base;
diff --git a/include/block/block.h b/include/block/block.h
index 5fbab01..de0d6ab 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -344,6 +344,8 @@ int bdrv_discard(BlockDriverState *bs, int64_t sector_num,
int nb_sectors);
int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
int bdrv_has_zero_init_1(BlockDriverState *bs);
int bdrv_has_zero_init(BlockDriverState *bs);
+bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
+bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum);
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
--
1.7.9.5
- [Qemu-devel] [PATCHv5 00/17] block: logical block provisioning enhancements, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 02/17] block: add flags to bdrv_*_write_zeroes, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 01/17] block: make BdrvRequestFlags public, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 03/17] block: introduce BDRV_REQ_MAY_UNMAP request flag, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 04/17] block: add logical block provisioning info to BlockDriverInfo, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 06/17] block/iscsi: add .bdrv_get_info, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 05/17] block: add wrappers for logical block provisioning information,
Peter Lieven <=
- [Qemu-devel] [PATCHv5 07/17] block: add BlockLimits structure to BlockDriverState, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 09/17] block: honour BlockLimits in bdrv_co_discard, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 11/17] iscsi: set limits in BlockDriverState, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 08/17] block: honour BlockLimits in bdrv_co_do_write_zeroes, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 13/17] block: introduce bdrv_make_zero, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 12/17] iscsi: add bdrv_co_write_zeroes, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 14/17] block/get_block_status: fix BDRV_BLOCK_ZERO for unallocated blocks, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 10/17] iscsi: simplify iscsi_co_discard, Peter Lieven, 2013/10/20
- [Qemu-devel] [PATCHv5 15/17] qemu-img: add support for fully allocated images, Peter Lieven, 2013/10/20