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From 1eae92fe23ff0e5ba28374220417a44920192ee4 Mon Sep 17 00:00:00 2001
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Message-Id: <1eae92fe23ff0e5ba28374220417a44920192ee4.1389014116.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 14:08:57 +0100
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Subject: [PATCH 09/50] block: add logical block provisioning info to
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BlockDriverInfo
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1386598178-11845-12-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 56051
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 11/52] block: add logical block provisioning info to BlockDriverInfo
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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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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 e1a5c4bed44bc23f69f53883c657e31e150cab30)
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---
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include/block/block.h | 16 ++++++++++++++++
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1 file changed, 16 insertions(+)
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Signed-off-by: Michal Novotny <minovotn@redhat.com>
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---
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include/block/block.h | 16 ++++++++++++++++
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1 file changed, 16 insertions(+)
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diff --git a/include/block/block.h b/include/block/block.h
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index 10abc00..ab3044e 100644
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--- a/include/block/block.h
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+++ b/include/block/block.h
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@@ -18,6 +18,22 @@ typedef struct BlockDriverInfo {
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/* offset at which the VM state can be saved (0 if not possible) */
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int64_t vm_state_offset;
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bool is_dirty;
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+ /*
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+ * True if unallocated blocks read back as zeroes. This is equivalent
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+ * to the the LBPRZ flag in the SCSI logical block provisioning page.
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+ */
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+ bool unallocated_blocks_are_zero;
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+ /*
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+ * True if the driver can optimize writing zeroes by unmapping
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+ * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
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+ * with the difference that in qemu a discard is allowed to silently
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+ * fail. Therefore we have to use bdrv_write_zeroes with the
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+ * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
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+ * After this call the driver has to guarantee that the contents read
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+ * back as zero. It is additionally required that the block device is
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+ * opened with BDRV_O_UNMAP flag for this to work.
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+ */
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+ bool can_write_zeroes_with_unmap;
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} BlockDriverInfo;
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typedef struct BlockFragInfo {
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--
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1.7.11.7
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