block: fix spoiling all dirty bitmaps by mirror and migration

Mirror and migration use dirty bitmaps for their purposes, and since
commit [block: per caller dirty bitmap] they use their own bitmaps, not
the global one. But they use old functions bdrv_set_dirty and
bdrv_reset_dirty, which change all dirty bitmaps.

Named dirty bitmaps series by Fam and Snow are affected: mirroring and
migration will spoil all (not related to this mirroring or migration)
named dirty bitmaps.

This patch fixes this by adding bdrv_set_dirty_bitmap and
bdrv_reset_dirty_bitmap, which change concrete bitmap. Also, to prevent
such mistakes in future, old functions bdrv_(set,reset)_dirty are made
static, for internal block usage.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@parallels.com>
CC: John Snow <jsnow@redhat.com>
CC: Fam Zheng <famz@redhat.com>
CC: Denis V. Lunev <den@openvz.org>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1417081246-3593-1-git-send-email-vsementsov@parallels.com
Signed-off-by: Max Reitz <mreitz@redhat.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/block/mirror.c b/block/mirror.c
index 2c6dd2a..9019d1b 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -128,7 +128,8 @@ static void mirror_write_complete(void *opaque, int ret)
         BlockDriverState *source = s->common.bs;
         BlockErrorAction action;
 
-        bdrv_set_dirty(source, op->sector_num, op->nb_sectors);
+        bdrv_set_dirty_bitmap(source, s->dirty_bitmap, op->sector_num,
+                              op->nb_sectors);
         action = mirror_error_action(s, false, -ret);
         if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) {
             s->ret = ret;
@@ -145,7 +146,8 @@ static void mirror_read_complete(void *opaque, int ret)
         BlockDriverState *source = s->common.bs;
         BlockErrorAction action;
 
-        bdrv_set_dirty(source, op->sector_num, op->nb_sectors);
+        bdrv_set_dirty_bitmap(source, s->dirty_bitmap, op->sector_num,
+                              op->nb_sectors);
         action = mirror_error_action(s, true, -ret);
         if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) {
             s->ret = ret;
@@ -286,7 +288,8 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
         next_sector += sectors_per_chunk;
     }
 
-    bdrv_reset_dirty(source, sector_num, nb_sectors);
+    bdrv_reset_dirty_bitmap(source, s->dirty_bitmap, sector_num,
+                            nb_sectors);
 
     /* Copy the dirty cluster.  */
     s->in_flight++;
@@ -442,7 +445,7 @@ static void coroutine_fn mirror_run(void *opaque)
 
             assert(n > 0);
             if (ret == 1) {
-                bdrv_set_dirty(bs, sector_num, n);
+                bdrv_set_dirty_bitmap(bs, s->dirty_bitmap, sector_num, n);
                 sector_num = next;
             } else {
                 sector_num += n;