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From cd63525d205eda67c64d0838592b819d7f73529f Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Mon, 4 Nov 2013 22:32:33 +0100
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Subject: [PATCH 40/87] qcow2: Add more overlap check bitmask macros
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <1383604354-12743-43-git-send-email-mreitz@redhat.com>
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Patchwork-id: 55342
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O-Subject: [RHEL-7.0 qemu-kvm PATCH 42/43] qcow2: Add more overlap check bitmask macros
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Bugzilla: 1004347
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@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: 1004347
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Introduces the macros QCOW2_OL_CONSTANT and QCOW2_OL_ALL in addition to
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the already existing QCOW2_OL_CACHED, signifying all metadata overlap
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checks that can be performed in constant time (regardless of image size
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etc.) and truly all available overlap checks, respectively.
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 4a273c398b0c96985d56fed8156e19876b2e3c9e)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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---
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block/qcow2.h | 14 +++++++++++---
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1 file changed, 11 insertions(+), 3 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/qcow2.h | 14 +++++++++++---
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1 files changed, 11 insertions(+), 3 deletions(-)
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diff --git a/block/qcow2.h b/block/qcow2.h
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index 1bba3ed..e4c140c 100644
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--- a/block/qcow2.h
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+++ b/block/qcow2.h
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@@ -325,11 +325,19 @@ typedef enum QCow2MetadataOverlap {
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QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR),
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} QCow2MetadataOverlap;
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+/* Perform all overlap checks which can be done in constant time */
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+#define QCOW2_OL_CONSTANT \
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+ (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \
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+ QCOW2_OL_SNAPSHOT_TABLE)
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+
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/* Perform all overlap checks which don't require disk access */
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#define QCOW2_OL_CACHED \
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- (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_ACTIVE_L2 | \
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- QCOW2_OL_REFCOUNT_TABLE | QCOW2_OL_REFCOUNT_BLOCK | \
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- QCOW2_OL_SNAPSHOT_TABLE | QCOW2_OL_INACTIVE_L1)
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+ (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \
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+ QCOW2_OL_INACTIVE_L1)
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+
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+/* Perform all overlap checks */
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+#define QCOW2_OL_ALL \
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+ (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
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#define L1E_OFFSET_MASK 0x00ffffffffffff00ULL
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#define L2E_OFFSET_MASK 0x00ffffffffffff00ULL
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--
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1.7.1
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