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From fea907b6897cb3e644dcee3c537ce6e64d7850ed Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Mon, 11 Jul 2016 05:33:35 +0200
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Subject: [PATCH 2/7] BlockLimits: introduce max_transfer_length
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <1468215219-30793-3-git-send-email-famz@redhat.com>
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Patchwork-id: 71106
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O-Subject: [RHEL-7.3 qemu-kvm PATCH 2/6] BlockLimits: introduce max_transfer_length
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Bugzilla: 1318199
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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From: Peter Lieven <pl@kamp.de>
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Signed-off-by: Peter Lieven <pl@kamp.de>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 2647fab57d5d5e38b36f8dbda367d688045e6a2d)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block.c | 4 ++++
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include/block/block_int.h | 3 +++
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2 files changed, 7 insertions(+)
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diff --git a/block.c b/block.c
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index ecb2b09..ae756aa 100644
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--- a/block.c
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+++ b/block.c
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@@ -481,6 +481,7 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
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return;
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}
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bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length;
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+ bs->bl.max_transfer_length = bs->file->bl.max_transfer_length;
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bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment;
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} else {
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bs->bl.opt_mem_alignment = 512;
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@@ -495,6 +496,9 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
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bs->bl.opt_transfer_length =
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MAX(bs->bl.opt_transfer_length,
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bs->backing_hd->bl.opt_transfer_length);
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+ bs->bl.max_transfer_length =
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+ MIN_NON_ZERO(bs->bl.max_transfer_length,
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+ bs->backing_hd->bl.max_transfer_length);
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bs->bl.opt_mem_alignment =
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MAX(bs->bl.opt_mem_alignment,
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bs->backing_hd->bl.opt_mem_alignment);
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diff --git a/include/block/block_int.h b/include/block/block_int.h
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index 3f86649..28c34d8 100644
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--- a/include/block/block_int.h
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+++ b/include/block/block_int.h
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@@ -240,6 +240,9 @@ typedef struct BlockLimits {
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/* optimal transfer length in sectors */
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int opt_transfer_length;
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+ /* maximal transfer length in sectors */
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+ int max_transfer_length;
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+
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/* memory alignment so that no bounce buffer is needed */
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size_t opt_mem_alignment;
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} BlockLimits;
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--
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1.8.3.1
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