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From ad8bc0d8901415eeea7bb27ef26f197918be0752 Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Sat, 13 Jun 2015 16:22:09 +0200
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Subject: [PATCH 15/42] block: Add qemu_{,try_}blockalign0()
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Message-id: <1434212556-3927-16-git-send-email-mreitz@redhat.com>
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Patchwork-id: 66034
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O-Subject: [RHEL-7.2 qemu-kvm PATCH 15/42] block: Add qemu_{,try_}blockalign0()
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Bugzilla: 1129893
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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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BZ: 1129893
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These functions call their non-0-counterparts and then fill the
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allocated buffer with 0 (if the allocation has been successful).
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 9ebd84480583bb6d9a7666c079d99ff3266c423d)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block.c | 16 ++++++++++++++++
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include/block/block.h | 2 ++
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2 files changed, 18 insertions(+)
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diff --git a/block.c b/block.c
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index 1afa544..22ab762 100644
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--- a/block.c
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+++ b/block.c
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@@ -5178,6 +5178,11 @@ void *qemu_blockalign(BlockDriverState *bs, size_t size)
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return qemu_memalign(bdrv_opt_mem_align(bs), size);
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}
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+void *qemu_blockalign0(BlockDriverState *bs, size_t size)
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+{
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+ return memset(qemu_blockalign(bs, size), 0, size);
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+}
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+
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void *qemu_try_blockalign(BlockDriverState *bs, size_t size)
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{
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size_t align = bdrv_opt_mem_align(bs);
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@@ -5191,6 +5196,17 @@ void *qemu_try_blockalign(BlockDriverState *bs, size_t size)
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return qemu_try_memalign(align, size);
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}
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+void *qemu_try_blockalign0(BlockDriverState *bs, size_t size)
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+{
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+ void *mem = qemu_try_blockalign(bs, size);
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+
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+ if (mem) {
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+ memset(mem, 0, size);
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+ }
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+
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+ return mem;
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+}
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+
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/*
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* Check if all memory in this vector is sector aligned.
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*/
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diff --git a/include/block/block.h b/include/block/block.h
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index 7b538b7..8339cac 100644
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--- a/include/block/block.h
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+++ b/include/block/block.h
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@@ -417,7 +417,9 @@ void bdrv_img_create(const char *filename, const char *fmt,
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size_t bdrv_opt_mem_align(BlockDriverState *bs);
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void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
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void *qemu_blockalign(BlockDriverState *bs, size_t size);
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+void *qemu_blockalign0(BlockDriverState *bs, size_t size);
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void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
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+void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
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bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
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struct HBitmapIter;
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--
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1.8.3.1
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