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block: Create no_co_wrappers for open functions 

Images can't be opened in coroutine context because opening needs to
change the block graph. Add no_co_wrappers so that coroutines have a
simple way of opening images in a BH instead.

At the same time, mark the wrapped functions as no_coroutine_fn.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230126172432.436111-3-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-01-26 18:24:21 +01:00
parent d6ee2e324e
commit 4bee90e9da
3 changed files with 44 additions and 13 deletions
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1
block/meson.build
View File

@ -141,6 +141,7 @@ block_gen_c = custom_target('block-gen.c',
'../include/block/dirty-bitmap.h',
'../include/block/block_int-io.h',
'../include/block/block-global-state.h',
'../include/sysemu/block-backend-global-state.h',
'../include/sysemu/block-backend-io.h',
'coroutines.h'
),

35
include/block/block-global-state.h
View File

@ -77,16 +77,26 @@ BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *node_options,
int flags, Error **errp);
int bdrv_drop_filter(BlockDriverState *bs, Error **errp);
BdrvChild *bdrv_open_child(const char *filename,
QDict *options, const char *bdref_key,
BlockDriverState *parent,
const BdrvChildClass *child_class,
BdrvChildRole child_role,
bool allow_none, Error **errp);
BdrvChild * no_coroutine_fn
bdrv_open_child(const char *filename, QDict *options, const char *bdref_key,
BlockDriverState *parent, const BdrvChildClass *child_class,
BdrvChildRole child_role, bool allow_none, Error **errp);
BdrvChild * coroutine_fn no_co_wrapper
bdrv_co_open_child(const char *filename, QDict *options, const char *bdref_key,
BlockDriverState *parent, const BdrvChildClass *child_class,
BdrvChildRole child_role, bool allow_none, Error **errp);
int bdrv_open_file_child(const char *filename,
QDict *options, const char *bdref_key,
BlockDriverState *parent, Error **errp);
BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp);
BlockDriverState * no_coroutine_fn
bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp);
BlockDriverState * coroutine_fn no_co_wrapper
bdrv_co_open_blockdev_ref(BlockdevRef *ref, Error **errp);
int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd,
Error **errp);
int bdrv_set_backing_hd_drained(BlockDriverState *bs,
@ -94,8 +104,15 @@ int bdrv_set_backing_hd_drained(BlockDriverState *bs,
Error **errp);
int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
const char *bdref_key, Error **errp);
BlockDriverState *bdrv_open(const char *filename, const char *reference,
QDict *options, int flags, Error **errp);
BlockDriverState * no_coroutine_fn
bdrv_open(const char *filename, const char *reference, QDict *options,
int flags, Error **errp);
BlockDriverState * coroutine_fn no_co_wrapper
bdrv_co_open(const char *filename, const char *reference,
QDict *options, int flags, Error **errp);
BlockDriverState *bdrv_new_open_driver_opts(BlockDriver *drv,
const char *node_name,
QDict *options, int flags,

21
include/sysemu/block-backend-global-state.h
View File

@ -23,10 +23,23 @@
*/
BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm);
BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm,
uint64_t shared_perm, Error **errp);
BlockBackend *blk_new_open(const char *filename, const char *reference,
QDict *options, int flags, Error **errp);
BlockBackend * no_coroutine_fn
blk_new_with_bs(BlockDriverState *bs, uint64_t perm, uint64_t shared_perm,
Error **errp);
BlockBackend * coroutine_fn no_co_wrapper
blk_co_new_with_bs(BlockDriverState *bs, uint64_t perm, uint64_t shared_perm,
Error **errp);
BlockBackend * no_coroutine_fn
blk_new_open(const char *filename, const char *reference, QDict *options,
int flags, Error **errp);
BlockBackend * coroutine_fn no_co_wrapper
blk_co_new_open(const char *filename, const char *reference, QDict *options,
int flags, Error **errp);
int blk_get_refcnt(BlockBackend *blk);
void blk_ref(BlockBackend *blk);
void blk_unref(BlockBackend *blk);