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block: add default implementations for bdrv_co_get_block_status()

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bdrv_co_get_block_status_from_file() and
bdrv_co_get_block_status_from_backing() set *file to bs->file and
bs->backing respectively, so that bdrv_co_get_block_status() can recurse
to them. Future block drivers won't have to duplicate code to implement
this.

Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Manos Pitsidianakis <el13635@mail.ntua.gr>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Manos Pitsidianakis 2017-07-13 18:30:28 +03:00 • committed by Kevin Wolf
parent d8e12cd322
commit f7cc69b326
5 changed files with 47 additions and 33 deletions
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18
include/block/block_int.h
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@ -964,6 +964,24 @@ void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
uint64_t perm, uint64_t shared,
uint64_t *nperm, uint64_t *nshared);
/*
* Default implementation for drivers to pass bdrv_co_get_block_status() to
* their file.
*/
int64_t coroutine_fn bdrv_co_get_block_status_from_file(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors,
int *pnum,
BlockDriverState **file);
/*
* Default implementation for drivers to pass bdrv_co_get_block_status() to
* their backing file.
*/
int64_t coroutine_fn bdrv_co_get_block_status_from_backing(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors,
int *pnum,
BlockDriverState **file);
const char *bdrv_get_parent_name(const BlockDriverState *bs);
void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp);
bool blk_dev_has_removable_media(BlockBackend *blk);