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[Qemu-devel] [PATCH 4/8] block: add bdrv_load_dirty_bitmap
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-devel] [PATCH 4/8] block: add bdrv_load_dirty_bitmap |
Date: |
Mon, 8 Jun 2015 18:21:22 +0300 |
From: Vladimir Sementsov-Ogievskiy <address@hidden>
The funcion loads dirty bitmap from file, using underlying driver
function.
Note: the function doesn't change BdrvDirtyBitmap.file field. This field
is only used by bdrv_store_dirty_bitmap() function and is ONLY written
by bdrv_dirty_bitmap_set_file() function.
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
block.c | 37 +++++++++++++++++++++++++++++++++++++
include/block/block.h | 5 +++++
2 files changed, 42 insertions(+)
diff --git a/block.c b/block.c
index 74d4edc..6230717 100644
--- a/block.c
+++ b/block.c
@@ -3109,6 +3109,43 @@ void bdrv_release_meta_bitmap(BdrvDirtyBitmap *bitmap)
}
}
+BdrvDirtyBitmap *bdrv_load_dirty_bitmap(BlockDriverState *bs,
+ BlockDriverState *file,
+ int granularity,
+ const char *name,
+ Error **errp)
+{
+ BlockDriver *drv = file->drv;
+ if (!drv) {
+ return NULL;
+ }
+ if (drv->bdrv_dirty_bitmap_load) {
+ BdrvDirtyBitmap *bitmap;
+ uint64_t bitmap_size = bdrv_nb_sectors(bs);
+ uint8_t *buf = drv->bdrv_dirty_bitmap_load(file, name, bitmap_size,
+ granularity);
+ if (buf == NULL) {
+ return NULL;
+ }
+
+ bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
+ if (bitmap == NULL) {
+ g_free(buf);
+ return NULL;
+ }
+
+ hbitmap_deserialize_part(bitmap->bitmap, buf, 0, bitmap_size);
+ hbitmap_deserialize_finish(bitmap->bitmap);
+
+ return bitmap;
+ }
+ if (file->file) {
+ return bdrv_load_dirty_bitmap(bs, file->file, granularity, name,
+ errp);
+ }
+ return NULL;
+}
+
int bdrv_store_dirty_bitmap(BdrvDirtyBitmap *bitmap)
{
BlockDriverState *bs = bitmap->file;
diff --git a/include/block/block.h b/include/block/block.h
index 6e82597..fcdb0f3 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -508,6 +508,11 @@ HBitmap *bdrv_create_meta_bitmap(BdrvDirtyBitmap *bitmap,
uint64_t granularity);
void bdrv_release_meta_bitmap(BdrvDirtyBitmap *bitmap);
+BdrvDirtyBitmap *bdrv_load_dirty_bitmap(BlockDriverState *bs,
+ BlockDriverState *file,
+ int granularity,
+ const char *name,
+ Error **errp);
int bdrv_store_dirty_bitmap(BdrvDirtyBitmap *bitmap);
void bdrv_enable_copy_on_read(BlockDriverState *bs);
--
1.9.1