From: Vladimir Sementsov-Ogievskiy <vsement...@parallels.com>
Persistent dirty bitmaps are the bitmaps, for which the new field
BdrvDirtyBitmap.file is not NULL. We save all persistent dirty bitmaps
owned by BlockDriverState in corresponding bdrv_close().
BdrvDirtyBitmap.file is a BlockDriverState, where we want to save the
bitmap. It may be set in bdrv_dirty_bitmap_set_file() only once.
bdrv_ref/bdrv_unref are used for BdrvDirtyBitmap.file to be sure that
files will be closed and resources will be freed.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
---
block.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
include/block/block.h | 4 ++++
2 files changed, 49 insertions(+)
diff --git a/block.c b/block.c
index 575584d..74d4edc 100644
--- a/block.c
+++ b/block.c
@@ -70,6 +70,8 @@ struct BdrvDirtyBitmap {
BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */
char *name; /* Optional non-empty unique ID */
int64_t size; /* Size of the bitmap (Number of sectors) */
+ BlockDriverState *file; /* File where bitmap is loaded from (and should
+ be saved to) */
bool disabled; /* Bitmap is read-only */
QLIST_ENTRY(BdrvDirtyBitmap) list;
};
@@ -1710,6 +1712,7 @@ void bdrv_reopen_abort(BDRVReopenState *reopen_state)
void bdrv_close(BlockDriverState *bs)
{
BdrvAioNotifier *ban, *ban_next;
+ BdrvDirtyBitmap *bm, *bm_next;
if (bs->job) {
block_job_cancel_sync(bs->job);
@@ -1719,6 +1722,15 @@ void bdrv_close(BlockDriverState *bs)
bdrv_drain_all(); /* in case flush left pending I/O */
notifier_list_notify(&bs->close_notifiers, bs);
+ /* save and release persistent dirty bitmaps */
+ QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, bm_next) {
+ if (bm->file) {
+ bdrv_store_dirty_bitmap(bm);
+ bdrv_unref(bm->file);
+ bdrv_release_dirty_bitmap(bs, bm);
+ }
+ }
+
if (bs->drv) {
if (bs->backing_hd) {
BlockDriverState *backing_hd = bs->backing_hd;
@@ -3097,6 +3109,30 @@ void bdrv_release_meta_bitmap(BdrvDirtyBitmap *bitmap)
}
}
+int bdrv_store_dirty_bitmap(BdrvDirtyBitmap *bitmap)
+{
+ BlockDriverState *bs = bitmap->file;
+ uint8_t *buf;
+ uint64_t size;
+ assert(bs);
+ assert(bs->drv);
+ assert(bs->drv->bdrv_dirty_bitmap_store);
+
+ size = hbitmap_data_size(bitmap->bitmap, bitmap->size);
+ size = (size + 3) & ~3;
+ buf = g_malloc(size);
+
+ hbitmap_serialize_part(bitmap->bitmap, buf, 0, bitmap->size);
+
+ int res = bs->drv->bdrv_dirty_bitmap_store(bs, buf,
+ bitmap->name,
+ bitmap->size,
+
bdrv_dirty_bitmap_granularity(bitmap));
+
+ g_free(buf);
+ return res;
+}
+
BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs,
uint32_t granularity,
const char *name,
@@ -3257,6 +3293,15 @@ void bdrv_release_dirty_bitmap(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap)
}
}
+void bdrv_dirty_bitmap_set_file(BdrvDirtyBitmap *bitmap, BlockDriverState
*file)
+{
+ assert(bitmap->file == NULL);
+ bitmap->file = file;
+ if (file != NULL) {
+ bdrv_ref(file);
+ }
+}
+
void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
{
assert(!bdrv_dirty_bitmap_frozen(bitmap));
diff --git a/include/block/block.h b/include/block/block.h
index 593c29e..6e82597 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -468,6 +468,8 @@ BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState
*bs,
const char *name);
void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap);
void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
+void bdrv_dirty_bitmap_set_file(BdrvDirtyBitmap *bitmap,
+ BlockDriverState *file);
void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
@@ -506,6 +508,8 @@ HBitmap *bdrv_create_meta_bitmap(BdrvDirtyBitmap *bitmap,
uint64_t granularity);
void bdrv_release_meta_bitmap(BdrvDirtyBitmap *bitmap);
+int bdrv_store_dirty_bitmap(BdrvDirtyBitmap *bitmap);
+
void bdrv_enable_copy_on_read(BlockDriverState *bs);
void bdrv_disable_copy_on_read(BlockDriverState *bs);
--
1.9.1
