block: Do not export bdrv_first

The bdrv_first linked list of BlockDriverStates is currently extern so
that block migration can iterate the list.  However, since there is
already a bdrv_iterate() function there is no need to expose bdrv_first.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

3 files changed, 34 insertions, 33 deletions

diff --git a/block-migration.c b/block-migration.c
index 92349a2149..7d04d6db0a 100644
--- a/block-migration.c
+++ b/block-migration.c
@@ -230,12 +230,42 @@ static void set_dirty_tracking(int enable)
     }
 }
 
-static void init_blk_migration(Monitor *mon, QEMUFile *f)
+static void init_blk_migration_it(void *opaque, BlockDriverState *bs)
 {
+    Monitor *mon = opaque;
     BlkMigDevState *bmds;
-    BlockDriverState *bs;
     int64_t sectors;
 
+    if (bs->type == BDRV_TYPE_HD) {
+        sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
+        if (sectors == 0) {
+            return;
+        }
+
+        bmds = qemu_mallocz(sizeof(BlkMigDevState));
+        bmds->bs = bs;
+        bmds->bulk_completed = 0;
+        bmds->total_sectors = sectors;
+        bmds->completed_sectors = 0;
+        bmds->shared_base = block_mig_state.shared_base;
+
+        block_mig_state.total_sector_sum += sectors;
+
+        if (bmds->shared_base) {
+            monitor_printf(mon, "Start migration for %s with shared base "
+                                "image\n",
+                           bs->device_name);
+        } else {
+            monitor_printf(mon, "Start full migration for %s\n",
+                           bs->device_name);
+        }
+
+        QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry);
+    }
+}
+
+static void init_blk_migration(Monitor *mon, QEMUFile *f)
+{
     block_mig_state.submitted = 0;
     block_mig_state.read_done = 0;
     block_mig_state.transferred = 0;
@@ -245,34 +275,7 @@ static void init_blk_migration(Monitor *mon, QEMUFile *f)
     block_mig_state.total_time = 0;
     block_mig_state.reads = 0;
 
-    for (bs = bdrv_first; bs != NULL; bs = bs->next) {
-        if (bs->type == BDRV_TYPE_HD) {
-            sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
-            if (sectors == 0) {
-                continue;
-            }
-
-            bmds = qemu_mallocz(sizeof(BlkMigDevState));
-            bmds->bs = bs;
-            bmds->bulk_completed = 0;
-            bmds->total_sectors = sectors;
-            bmds->completed_sectors = 0;
-            bmds->shared_base = block_mig_state.shared_base;
-
-            block_mig_state.total_sector_sum += sectors;
-
-            if (bmds->shared_base) {
-                monitor_printf(mon, "Start migration for %s with shared base "
-                                    "image\n",
-                               bs->device_name);
-            } else {
-                monitor_printf(mon, "Start full migration for %s\n",
-                               bs->device_name);
-            }
-
-            QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry);
-        }
-    }
+    bdrv_iterate(init_blk_migration_it, mon);
 }
 
 static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f)
diff --git a/block.c b/block.c
index ed4c819f04..61da183656 100644
--- a/block.c
+++ b/block.c
@@ -55,7 +55,7 @@ static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
                          const uint8_t *buf, int nb_sectors);
 
-BlockDriverState *bdrv_first;
+static BlockDriverState *bdrv_first;
 
 static BlockDriver *first_drv;
 
diff --git a/block_int.h b/block_int.h
index e7e1e7e514..d5a808db9f 100644
--- a/block_int.h
+++ b/block_int.h
@@ -200,8 +200,6 @@ void qemu_aio_release(void *p);
 
 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 
-extern BlockDriverState *bdrv_first;
-
 #ifdef _WIN32
 int is_windows_drive(const char *filename);
 #endif