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From 0d32273cd7f5daa7431b5e2068537154dea101fb Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Mon, 4 Nov 2013 22:32:30 +0100
Subject: [PATCH 37/87] qcow2: Make overlap check mask variable

RH-Author: Max Reitz <mreitz@redhat.com>
Message-id: <1383604354-12743-40-git-send-email-mreitz@redhat.com>
Patchwork-id: 55339
O-Subject: [RHEL-7.0 qemu-kvm PATCH 39/43] qcow2: Make overlap check mask variable
Bugzilla: 1004347
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Fam Zheng <famz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

BZ: 1004347

Replace the QCOW2_OL_DEFAULT macro by a variable overlap_check in
BDRVQcowState.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 3e3553905cfc814d59de6d1a634c3a991b2a9257)

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2-refcount.c | 2 +-
 block/qcow2.c          | 2 ++
 block/qcow2.h          | 5 ++---
 3 files changed, 5 insertions(+), 4 deletions(-)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 block/qcow2-refcount.c |    2 +-
 block/qcow2.c          |    2 ++
 block/qcow2.h          |    5 ++---
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 91c446b..3787314 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1629,7 +1629,7 @@ int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
                                  int64_t size)
 {
     BDRVQcowState *s = bs->opaque;
-    int chk = QCOW2_OL_DEFAULT & ~ign;
+    int chk = s->overlap_check & ~ign;
     int i, j;
 
     if (!size) {
diff --git a/block/qcow2.c b/block/qcow2.c
index ac5ed47..157361f 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -630,6 +630,8 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
     s->discard_passthrough[QCOW2_DISCARD_OTHER] =
         qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_OTHER, false);
 
+    s->overlap_check = QCOW2_OL_CACHED;
+
     qemu_opts_del(opts);
 
     if (s->use_lazy_refcounts && s->qcow_version < 3) {
diff --git a/block/qcow2.h b/block/qcow2.h
index 64ad43c..d1fd91b 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -202,6 +202,8 @@ typedef struct BDRVQcowState {
 
     bool discard_passthrough[QCOW2_DISCARD_MAX];
 
+    int overlap_check; /* bitmask of Qcow2MetadataOverlap values */
+
     uint64_t incompatible_features;
     uint64_t compatible_features;
     uint64_t autoclear_features;
@@ -320,9 +322,6 @@ typedef enum QCow2MetadataOverlap {
      QCOW2_OL_REFCOUNT_TABLE | QCOW2_OL_REFCOUNT_BLOCK | \
      QCOW2_OL_SNAPSHOT_TABLE | QCOW2_OL_INACTIVE_L1)
 
-/* The default checks to perform */
-#define QCOW2_OL_DEFAULT QCOW2_OL_CACHED
-
 #define L1E_OFFSET_MASK 0x00ffffffffffff00ULL
 #define L2E_OFFSET_MASK 0x00ffffffffffff00ULL
 #define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
-- 
1.7.1