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block: Add BlockDriver.is_format

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We want to unify child_format and child_file at some point.  One of the
important things that set format drivers apart from other drivers is
that they do not expect other format nodes under them (except in the
backing chain), i.e. we must not probe formats inside of formats.  That
means we need something on which to distinguish format drivers from
others, and hence this flag.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-Id: <20200513110544.176672-3-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2020-05-13 13:05:12 +02:00 • committed by Kevin Wolf
parent 6540fd153c
commit d67066d8bc
14 changed files with 21 additions and 0 deletions
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7
include/block/block_int.h
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@ -95,6 +95,13 @@ struct BlockDriver {
* must implement them and return -ENOTSUP.
*/
bool is_filter;
/*
* Set to true if the BlockDriver is a format driver. Format nodes
* generally do not expect their children to be other format nodes
* (except for backing files), and so format probing is disabled
* on those children.
*/
bool is_format;
/*
* Return true if @to_replace can be replaced by a BDS with the
* same data as @bs without it affecting @bs's behavior (that is,