From 1041ad03a2c47f5bbae0b4c8089bab98ef1ba12d Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Thu, 6 Dec 2018 17:12:36 +0000
Subject: [PATCH 11/15] qcow2: Resize the cache upon image resizing

RH-Author: Kevin Wolf <kwolf@redhat.com>
Message-id: <20181206171240.5674-12-kwolf@redhat.com>
Patchwork-id: 83293
O-Subject: [RHEL-8.0 qemu-kvm PATCH 11/15] qcow2: Resize the cache upon image resizing
Bugzilla: 1656507
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: John Snow <jsnow@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

From: Leonid Bloch <lbloch@janustech.com>

The caches are now recalculated upon image resizing. This is done
because the new default behavior of assigning L2 cache relatively to
the image size, implies that the cache will be adapted accordingly
after an image resize.

Signed-off-by: Leonid Bloch <lbloch@janustech.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 45b4949c7bcdcd998cb42f5c517e80a2657cfd33)
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 block/qcow2.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/block/qcow2.c b/block/qcow2.c
index fc6bddd..72f1ea8 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3462,6 +3462,7 @@ static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset,
     uint64_t old_length;
     int64_t new_l1_size;
     int ret;
+    QDict *options;
 
     if (prealloc != PREALLOC_MODE_OFF && prealloc != PREALLOC_MODE_METADATA &&
         prealloc != PREALLOC_MODE_FALLOC && prealloc != PREALLOC_MODE_FULL)
@@ -3686,6 +3687,8 @@ static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset,
         }
     }
 
+    bs->total_sectors = offset / BDRV_SECTOR_SIZE;
+
     /* write updated header.size */
     offset = cpu_to_be64(offset);
     ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size),
@@ -3696,6 +3699,14 @@ static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset,
     }
 
     s->l1_vm_state_index = new_l1_size;
+
+    /* Update cache sizes */
+    options = qdict_clone_shallow(bs->options);
+    ret = qcow2_update_options(bs, options, s->flags, errp);
+    qobject_unref(options);
+    if (ret < 0) {
+        goto fail;
+    }
     ret = 0;
 fail:
     qemu_co_mutex_unlock(&s->lock);
-- 
1.8.3.1