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block: Unify bdrv_child_cb_attach()

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Make bdrv_child_cb_attach() call bdrv_backing_attach() for children with
a COW role (and drop the reverse call from bdrv_backing_attach()), so it
can be used for any child (with a proper role set).

Because so far no child has a proper role set, we need a temporary new
callback for child_backing.attach that ensures bdrv_backing_attach() is
called for all COW children that do not have their role set yet.

(Also, move bdrv_child_cb_attach() down to group it with
bdrv_inherited_options().)

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200513110544.176672-13-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 13:05:22 +02:00 committed by Kevin Wolf
parent 00ff7ffd67
commit ca2f1234c3
1 changed files with 20 additions and 7 deletions
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27
block.c
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@ -84,6 +84,7 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
static void bdrv_inherited_options(BdrvChildRole role, bool parent_is_format,
int *child_flags, QDict *child_options,
int parent_flags, QDict *parent_options);
static void bdrv_child_cb_attach(BdrvChild *child);
/* If non-zero, use only whitelisted block drivers */
static int use_bdrv_whitelist;
@ -1099,12 +1100,6 @@ static void bdrv_child_cb_drained_end(BdrvChild *child,
bdrv_drained_end_no_poll(bs, drained_end_counter);
}
static void bdrv_child_cb_attach(BdrvChild *child)
{
BlockDriverState *bs = child->opaque;
bdrv_apply_subtree_drain(child, bs);
}
static void bdrv_child_cb_detach(BdrvChild *child)
{
BlockDriverState *bs = child->opaque;
@ -1252,7 +1247,14 @@ static void bdrv_backing_attach(BdrvChild *c)
parent->backing_blocker);
bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET,
parent->backing_blocker);
}
/* XXX: Will be removed along with child_backing */
static void bdrv_child_cb_attach_backing(BdrvChild *c)
{
if (!(c->role & BDRV_CHILD_COW)) {
bdrv_backing_attach(c);
}
bdrv_child_cb_attach(c);
}
@ -1311,7 +1313,7 @@ static int bdrv_backing_update_filename(BdrvChild *c, BlockDriverState *base,
const BdrvChildClass child_backing = {
.parent_is_bds = true,
.get_parent_desc = bdrv_child_get_parent_desc,
.attach = bdrv_backing_attach,
.attach = bdrv_child_cb_attach_backing,
.detach = bdrv_backing_detach,
.inherit_options = bdrv_backing_options,
.drained_begin = bdrv_child_cb_drained_begin,
@ -1403,6 +1405,17 @@ static void bdrv_inherited_options(BdrvChildRole role, bool parent_is_format,
*child_flags = flags;
}
static void bdrv_child_cb_attach(BdrvChild *child)
{
BlockDriverState *bs = child->opaque;
if (child->role & BDRV_CHILD_COW) {
bdrv_backing_attach(child);
}
bdrv_apply_subtree_drain(child, bs);
}
static int bdrv_open_flags(BlockDriverState *bs, int flags)
{
int open_flags = flags;