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block/dirty-bitmap: add bdrv_remove_persistent_dirty_bitmap

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Interface for removing persistent bitmap from its storage.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20170628120530.31251-28-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2017-06-28 15:05:27 +03:00 committed by Max Reitz
parent fc905d3a0c
commit 56f364e6d7
3 changed files with 24 additions and 0 deletions
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18
block/dirty-bitmap.c
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@ -395,6 +395,7 @@ void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
/**
* Release all named dirty bitmaps attached to a BDS (for use in bdrv_close()).
* There must not be any frozen bitmaps attached.
* This function does not remove persistent bitmaps from the storage.
* Called with BQL taken.
*/
void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs)
@ -402,6 +403,23 @@ void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs)
bdrv_do_release_matching_dirty_bitmap(bs, NULL, true);
}
/**
* Remove persistent dirty bitmap from the storage if it exists.
* Absence of bitmap is not an error, because we have the following scenario:
* BdrvDirtyBitmap can have .persistent = true but not yet saved and have no
* stored version. For such bitmap bdrv_remove_persistent_dirty_bitmap() should
* not fail.
* This function doesn't release corresponding BdrvDirtyBitmap.
*/
void bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs,
const char *name,
Error **errp)
{
if (bs->drv && bs->drv->bdrv_remove_persistent_dirty_bitmap) {
bs->drv->bdrv_remove_persistent_dirty_bitmap(bs, name, errp);
}
}
/* Called with BQL taken. */
void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
{

3
include/block/block_int.h
View File

@ -391,6 +391,9 @@ struct BlockDriver {
const char *name,
uint32_t granularity,
Error **errp);
void (*bdrv_remove_persistent_dirty_bitmap)(BlockDriverState *bs,
const char *name,
Error **errp);
QLIST_ENTRY(BlockDriver) list;
};

3
include/block/dirty-bitmap.h
View File

@ -25,6 +25,9 @@ BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs,
void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap);
void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs);
void bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs,
const char *name,
Error **errp);
void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);