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block: Rewrite the snapshot authorization mechanism for block filters.

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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 <pbonzini@redhat.com> 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 <pbonzini@redhat.com>
Signed-off-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Benoît Canet 2014-03-03 19:11:34 +01:00 • committed by Stefan Hajnoczi
parent 98d39e34fe
commit b5042a3622
5 changed files with 46 additions and 46 deletions
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9
include/block/block.h
View file

@ -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);

8
include/block/block_int.h
View file

@ -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.