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qemu-patch-raspberry4
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block: Add child_of_bds 

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>
stable-6.0
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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24
block.c
View File

@ -1429,6 +1429,30 @@ static void bdrv_child_cb_detach(BdrvChild *child)
bdrv_unapply_subtree_drain(child, bs);
}
static int bdrv_child_cb_update_filename(BdrvChild *c, BlockDriverState *base,
const char *filename, Error **errp)
{
if (c->role & BDRV_CHILD_COW) {
return bdrv_backing_update_filename(c, base, filename, errp);
}
return 0;
}
const BdrvChildClass child_of_bds = {
.parent_is_bds = true,
.get_parent_desc = bdrv_child_get_parent_desc,
.inherit_options = bdrv_inherited_options,
.drained_begin = bdrv_child_cb_drained_begin,
.drained_poll = bdrv_child_cb_drained_poll,
.drained_end = bdrv_child_cb_drained_end,
.attach = bdrv_child_cb_attach,
.detach = bdrv_child_cb_detach,
.inactivate = bdrv_child_cb_inactivate,
.can_set_aio_ctx = bdrv_child_cb_can_set_aio_ctx,
.set_aio_ctx = bdrv_child_cb_set_aio_ctx,
.update_filename = bdrv_child_cb_update_filename,
};
static int bdrv_open_flags(BlockDriverState *bs, int flags)
{
int open_flags = flags;

1
include/block/block_int.h
View File

@ -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;