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block: Add child_of_bds

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Any current user of child_file, child_format, and child_backing can and
should use this generic BdrvChildClass instead, as it can handle all of
these cases.  However, to be able to do so, the users must pass the
appropriate BdrvChildRole when the child is created/attached.  (The
following commits will take care of that.)

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200513110544.176672-15-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2020-05-13 13:05:24 +02:00 • committed by Kevin Wolf
parent 48e0828861
commit 4348355032
2 changed files with 25 additions and 0 deletions
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include/block/block_int.h
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@ -740,6 +740,7 @@ struct BdrvChildClass {
void (*set_aio_ctx)(BdrvChild *child, AioContext *ctx, GSList **ignore);
};
extern const BdrvChildClass child_of_bds;
extern const BdrvChildClass child_file;
extern const BdrvChildClass child_format;
extern const BdrvChildClass child_backing;