From b5042a36229b4fa5eeb66bbcde78f704975aec00 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Beno=C3=AEt=20Canet?= Date: Mon, 3 Mar 2014 19:11:34 +0100 Subject: block: Rewrite the snapshot authorization mechanism for block filters. This patch keep the recursive way of doing things but simplify it by giving two responsabilities to all block filters implementors. They will need to do two things: -Set the is_filter field of their block driver to true. -Implement the bdrv_recurse_is_first_non_filter method of their block driver like it is done on the Quorum block driver. (block/quorum.c) [Paolo Bonzini pointed out that this patch changes the semantics of blkverify, which now recurses down both bs->file and s->test_file. -- Stefan] Reported-by: Paolo Bonzini Signed-off-by: Benoit Canet Signed-off-by: Stefan Hajnoczi --- include/block/block.h | 9 --------- include/block/block_int.h | 8 ++++---- 2 files changed, 4 insertions(+), 13 deletions(-) (limited to 'include') diff --git a/include/block/block.h b/include/block/block.h index 780f48b7b3..bd34d14109 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -286,15 +286,6 @@ int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); int bdrv_amend_options(BlockDriverState *bs_new, QEMUOptionParameter *options); /* external snapshots */ - -typedef enum { - BS_IS_A_FILTER, - BS_FILTER_PASS_DOWN, - BS_AUTHORIZATION_COUNT, -} BsAuthorization; - -bool bdrv_generic_is_first_non_filter(BlockDriverState *bs, - BlockDriverState *candidate); bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, BlockDriverState *candidate); bool bdrv_is_first_non_filter(BlockDriverState *candidate); diff --git a/include/block/block_int.h b/include/block/block_int.h index 0bcf1c9b8c..4fc5ea8a65 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -76,10 +76,10 @@ struct BlockDriver { const char *format_name; int instance_size; - /* this table of boolean contains authorizations for the block operations */ - bool authorizations[BS_AUTHORIZATION_COUNT]; - /* for snapshots complex block filter like Quorum can implement the - * following recursive callback instead of BS_IS_A_FILTER. + /* set to true if the BlockDriver is a block filter */ + bool is_filter; + /* for snapshots block filter like Quorum can implement the + * following recursive callback. * It's purpose is to recurse on the filter children while calling * bdrv_recurse_is_first_non_filter on them. * For a sample implementation look in the future Quorum block filter. -- cgit v1.2.1