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block: Rename BdrvChildRole to BdrvChildClass

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This structure nearly only contains parent callbacks for child state
changes.  It cannot really reflect a child's role, because different
roles may overlap (as we will see when real roles are introduced), and
because parents can have custom callbacks even when the child fulfills a
standard role.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-Id: <20200513110544.176672-4-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2020-05-13 13:05:13 +02:00 • committed by Kevin Wolf
parent d67066d8bc
commit bd86fb990c
17 changed files with 141 additions and 133 deletions
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22
include/block/block_int.h
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@ -556,14 +556,14 @@ struct BlockDriver {
* the parents in @parent_perm and @parent_shared.
*
* If @c is NULL, return the permissions for attaching a new child for the
* given @role.
* given @child_class.
*
* If @reopen_queue is non-NULL, don't return the currently needed
* permissions, but those that will be needed after applying the
* @reopen_queue.
*/
void (*bdrv_child_perm)(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
const BdrvChildClass *child_class,
BlockReopenQueue *reopen_queue,
uint64_t parent_perm, uint64_t parent_shared,
uint64_t *nperm, uint64_t *nshared);
@ -665,7 +665,7 @@ typedef struct BdrvAioNotifier {
QLIST_ENTRY(BdrvAioNotifier) list;
} BdrvAioNotifier;
struct BdrvChildRole {
struct BdrvChildClass {
/* If true, bdrv_replace_node() doesn't change the node this BdrvChild
* points to. */
bool stay_at_node;
@ -738,14 +738,14 @@ struct BdrvChildRole {
void (*set_aio_ctx)(BdrvChild *child, AioContext *ctx, GSList **ignore);
};
extern const BdrvChildRole child_file;
extern const BdrvChildRole child_format;
extern const BdrvChildRole child_backing;
extern const BdrvChildClass child_file;
extern const BdrvChildClass child_format;
extern const BdrvChildClass child_backing;
struct BdrvChild {
BlockDriverState *bs;
char *name;
const BdrvChildRole *role;
const BdrvChildClass *klass;
void *opaque;
/**
@ -772,7 +772,7 @@ struct BdrvChild {
/*
* How many times the parent of this child has been drained
* (through role->drained_*).
* (through klass->drained_*).
* Usually, this is equal to bs->quiesce_counter (potentially
* reduced by bdrv_drain_all_count). It may differ while the
* child is entering or leaving a drained section.
@ -1232,7 +1232,7 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
const char *child_name,
const BdrvChildRole *child_role,
const BdrvChildClass *child_class,
AioContext *ctx,
uint64_t perm, uint64_t shared_perm,
void *opaque, Error **errp);
@ -1263,7 +1263,7 @@ int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp);
* block filters: Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED and RESIZE to
* all children */
void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
const BdrvChildClass *child_class,
BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared);
@ -1273,7 +1273,7 @@ void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
* requires WRITE | RESIZE for read-write images, always requires
* CONSISTENT_READ and doesn't share WRITE. */
void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
const BdrvChildClass *child_class,
BlockReopenQueue *reopen_queue,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared);