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From 1098dfcaf705697337694269c4990d2fb58347a6 Mon Sep 17 00:00:00 2001
From: Fam Zheng <famz@redhat.com>
Date: Fri, 17 Jan 2014 03:07:58 +0100
Subject: [PATCH 15/34] mirror: Move base to MirrorBlockJob

RH-Author: Fam Zheng <famz@redhat.com>
Message-id: <1389928083-8921-14-git-send-email-famz@redhat.com>
Patchwork-id: 56775
O-Subject: [RHEL-7 qemu-kvm PATCH 13/18] mirror: Move base to MirrorBlockJob
Bugzilla: 1041301
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

This allows setting the base before entering mirror_run, commit will
make use of it.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 5bc361b8134eff68e2c40916d1cf58b3523d223b)
Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/mirror.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 block/mirror.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index 1e3337f..8ccde2f 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -31,6 +31,7 @@ typedef struct MirrorBlockJob {
     BlockJob common;
     RateLimit limit;
     BlockDriverState *target;
+    BlockDriverState *base;
     MirrorSyncMode mode;
     BlockdevOnError on_source_error, on_target_error;
     bool synced;
@@ -334,8 +335,7 @@ static void coroutine_fn mirror_run(void *opaque)
 
     if (s->mode != MIRROR_SYNC_MODE_NONE) {
         /* First part, loop on the sectors and initialize the dirty bitmap.  */
-        BlockDriverState *base;
-        base = s->mode == MIRROR_SYNC_MODE_FULL ? NULL : bs->backing_hd;
+        BlockDriverState *base = s->base;
         for (sector_num = 0; sector_num < end; ) {
             int64_t next = (sector_num | (sectors_per_chunk - 1)) + 1;
             ret = bdrv_is_allocated_above(bs, base,
@@ -540,6 +540,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target,
                   void *opaque, Error **errp)
 {
     MirrorBlockJob *s;
+    BlockDriverState *base = NULL;
 
     if (granularity == 0) {
         /* Choose the default granularity based on the target file's cluster
@@ -562,6 +563,12 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target,
         return;
     }
 
+    if (mode == MIRROR_SYNC_MODE_TOP) {
+        base = bs->backing_hd;
+    } else {
+        base = NULL;
+    }
+
     s = block_job_create(&mirror_job_driver, bs, speed, cb, opaque, errp);
     if (!s) {
         return;
@@ -571,6 +578,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target,
     s->on_target_error = on_target_error;
     s->target = target;
     s->mode = mode;
+    s->base = base;
     s->granularity = granularity;
     s->buf_size = MAX(buf_size, granularity);
 
-- 
1.7.1