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From 9672f88c8747e874efb9d8d6f67b8d4d8c474779 Mon Sep 17 00:00:00 2001
From: John Snow <jsnow@redhat.com>
Date: Tue, 20 Nov 2018 18:18:25 +0000
Subject: [PATCH 31/35] bloc/qcow2: drop dirty_bitmaps_loaded state variable

RH-Author: John Snow <jsnow@redhat.com>
Message-id: <20181120181828.15132-22-jsnow@redhat.com>
Patchwork-id: 83067
O-Subject: [RHEL8/rhel qemu-kvm PATCH 21/24] bloc/qcow2: drop dirty_bitmaps_loaded state variable
Bugzilla: 1518989
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

This variable doesn't work as it should, because it is actually cleared
in qcow2_co_invalidate_cache() by memset(). Drop it, as the following
patch will introduce new behavior.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
(cherry picked from commit 2ea427effff61efa5d0dc69f9cae126d13879617)
Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 block/qcow2.c | 19 ++-----------------
 block/qcow2.h |  1 -
 2 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index 5c5530d..d260cd6 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1149,7 +1149,6 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
     uint64_t ext_end;
     uint64_t l1_vm_state_index;
     bool update_header = false;
-    bool header_updated = false;
 
     ret = bdrv_pread(bs->file, 0, &header, sizeof(header));
     if (ret < 0) {
@@ -1488,23 +1487,9 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
         s->autoclear_features &= QCOW2_AUTOCLEAR_MASK;
     }
 
-    if (s->dirty_bitmaps_loaded) {
-        /* It's some kind of reopen. There are no known cases where we need to
-         * reload bitmaps in such a situation, so it's safer to skip them.
-         *
-         * Moreover, if we have some readonly bitmaps and we are reopening for
-         * rw we should reopen bitmaps correspondingly.
-         */
-        if (bdrv_has_readonly_bitmaps(bs) &&
-            !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE))
-        {
-            qcow2_reopen_bitmaps_rw_hint(bs, &header_updated, &local_err);
-        }
-    } else {
-        header_updated = qcow2_load_dirty_bitmaps(bs, &local_err);
-        s->dirty_bitmaps_loaded = true;
+    if (qcow2_load_dirty_bitmaps(bs, &local_err)) {
+        update_header = false;
     }
-    update_header = update_header && !header_updated;
     if (local_err != NULL) {
         error_propagate(errp, local_err);
         ret = -EINVAL;
diff --git a/block/qcow2.h b/block/qcow2.h
index d2c63e4..43163b2 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -299,7 +299,6 @@ typedef struct BDRVQcow2State {
     uint32_t nb_bitmaps;
     uint64_t bitmap_directory_size;
     uint64_t bitmap_directory_offset;
-    bool dirty_bitmaps_loaded;
 
     int flags;
     int qcow_version;
-- 
1.8.3.1