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block: Release named dirty bitmaps in bdrv_close()

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bdrv_delete() is not very happy about deleting BlockDriverStates with
dirty bitmaps still attached to them. In the past, we got around that
very easily by relying on bdrv_close_all() bypassing bdrv_delete(), and
bdrv_close() simply ignoring that condition. We should fix that by
releasing all named dirty bitmaps in bdrv_close() (there should not be
any unnamed bitmaps left) and moving the assertion from bdrv_delete()
there.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2016-01-29 16:36:01 +01:00
parent e43f7f6f46
commit c5acdc9ab4
1 changed files with 31 additions and 8 deletions
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39
block.c
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@ -88,6 +88,8 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename,
const BdrvChildRole *child_role, Error **errp);
static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs);
static void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs);
/* If non-zero, use only whitelisted block drivers */
static int use_bdrv_whitelist;
@ -2157,6 +2159,9 @@ void bdrv_close(BlockDriverState *bs)
notifier_list_notify(&bs->close_notifiers, bs);
bdrv_release_named_dirty_bitmaps(bs);
assert(QLIST_EMPTY(&bs->dirty_bitmaps));
if (bs->blk) {
blk_dev_change_media_cb(bs->blk, false);
}
@ -2366,7 +2371,6 @@ static void bdrv_delete(BlockDriverState *bs)
assert(!bs->job);
assert(bdrv_op_blocker_is_empty(bs));
assert(!bs->refcnt);
assert(QLIST_EMPTY(&bs->dirty_bitmaps));
bdrv_close(bs);
@ -3582,21 +3586,40 @@ static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs)
}
}
void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
static void bdrv_do_release_matching_dirty_bitmap(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap,
bool only_named)
{
BdrvDirtyBitmap *bm, *next;
QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
if (bm == bitmap) {
if ((!bitmap || bm == bitmap) && (!only_named || bm->name)) {
assert(!bdrv_dirty_bitmap_frozen(bm));
QLIST_REMOVE(bitmap, list);
hbitmap_free(bitmap->bitmap);
g_free(bitmap->name);
g_free(bitmap);
return;
QLIST_REMOVE(bm, list);
hbitmap_free(bm->bitmap);
g_free(bm->name);
g_free(bm);
if (bitmap) {
return;
}
}
}
}
void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
{
bdrv_do_release_matching_dirty_bitmap(bs, bitmap, false);
}
/**
* Release all named dirty bitmaps attached to a BDS (for use in bdrv_close()).
* There must not be any frozen bitmaps attached.
*/
static void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs)
{
bdrv_do_release_matching_dirty_bitmap(bs, NULL, true);
}
void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
{
assert(!bdrv_dirty_bitmap_frozen(bitmap));