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From 53d8964bc0e80e99d5ccb15100ecb93a7b5f74b0 Mon Sep 17 00:00:00 2001
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Message-Id: <53d8964bc0e80e99d5ccb15100ecb93a7b5f74b0.1389014116.git.minovotn@redhat.com>
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In-Reply-To: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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References: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Mon, 9 Dec 2013 14:08:58 +0100
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Subject: [PATCH 10/50] block: add wrappers for logical block provisioning
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information
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1386598178-11845-13-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 56050
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 12/52] block: add wrappers for logical block provisioning information
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Bugzilla: 1007815
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Peter Lieven <pl@kamp.de>
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This adds 2 wrappers to read the unallocated_blocks_are_zero and
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can_write_zeroes_with_unmap info from the BDI. The wrappers are
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required to check for the existence of a backing_hd and
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if the devices are opened with the correct flags.
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Peter Lieven <pl@kamp.de>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 4ce786914b745a144a9eda1ea33f3ff98328c527)
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---
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block.c | 30 ++++++++++++++++++++++++++++++
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include/block/block.h | 2 ++
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2 files changed, 32 insertions(+)
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Signed-off-by: Michal Novotny <minovotn@redhat.com>
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---
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block.c | 30 ++++++++++++++++++++++++++++++
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include/block/block.h | 2 ++
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2 files changed, 32 insertions(+)
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diff --git a/block.c b/block.c
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index 77167f0..2fae459 100644
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--- a/block.c
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+++ b/block.c
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@@ -3121,6 +3121,36 @@ int bdrv_has_zero_init(BlockDriverState *bs)
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return 0;
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}
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+bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs)
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+{
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+ BlockDriverInfo bdi;
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+
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+ if (bs->backing_hd) {
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+ return false;
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+ }
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+
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+ if (bdrv_get_info(bs, &bdi) == 0) {
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+ return bdi.unallocated_blocks_are_zero;
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+ }
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+
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+ return false;
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+}
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+
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+bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs)
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+{
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+ BlockDriverInfo bdi;
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+
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+ if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) {
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+ return false;
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+ }
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+
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+ if (bdrv_get_info(bs, &bdi) == 0) {
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+ return bdi.can_write_zeroes_with_unmap;
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+ }
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+
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+ return false;
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+}
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+
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typedef struct BdrvCoGetBlockStatusData {
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BlockDriverState *bs;
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BlockDriverState *base;
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diff --git a/include/block/block.h b/include/block/block.h
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index ab3044e..1958d98 100644
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--- a/include/block/block.h
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+++ b/include/block/block.h
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@@ -330,6 +330,8 @@ int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
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int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
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int bdrv_has_zero_init_1(BlockDriverState *bs);
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int bdrv_has_zero_init(BlockDriverState *bs);
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+bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
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+bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
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int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, int *pnum);
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int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
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--
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1.7.11.7
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