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From ef41c637feebd279b017838b46dc5cfdb52c1ef6 Mon Sep 17 00:00:00 2001
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Message-Id: <ef41c637feebd279b017838b46dc5cfdb52c1ef6.1389014116.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 14:09:00 +0100
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Subject: [PATCH 12/50] block: add BlockLimits structure to BlockDriverState
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1386598178-11845-15-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 56049
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 14/52] block: add BlockLimits structure to BlockDriverState
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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 patch adds BlockLimits which introduces discard and write_zeroes
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limits and alignment information to the BlockDriverState.
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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 fe81c2cca6dc69a5e423f6d8b235606b7f3ca7b7)
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---
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include/block/block_int.h | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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Signed-off-by: Michal Novotny <minovotn@redhat.com>
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---
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include/block/block_int.h | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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diff --git a/include/block/block_int.h b/include/block/block_int.h
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index 236c0c2..ab98c07 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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@@ -219,6 +219,20 @@ struct BlockDriver {
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QLIST_ENTRY(BlockDriver) list;
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};
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+typedef struct BlockLimits {
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+ /* maximum number of sectors that can be discarded at once */
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+ int max_discard;
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+
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+ /* optimal alignment for discard requests in sectors */
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+ int64_t discard_alignment;
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+
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+ /* maximum number of sectors that can zeroized at once */
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+ int max_write_zeroes;
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+
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+ /* optimal alignment for write zeroes requests in sectors */
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+ int64_t write_zeroes_alignment;
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+} BlockLimits;
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+
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/*
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* Note: the function bdrv_append() copies and swaps contents of
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* BlockDriverStates, so if you add new fields to this struct, please
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@@ -273,6 +287,9 @@ struct BlockDriverState {
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uint64_t total_time_ns[BDRV_MAX_IOTYPE];
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uint64_t wr_highest_sector;
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+ /* I/O Limits */
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+ BlockLimits bl;
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+
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/* Whether the disk can expand beyond total_sectors */
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int growable;
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--
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1.7.11.7
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