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block: return errors from bdrv_register_buf()

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Registering an I/O buffer is only a performance optimization hint but it
is still necessary to return errors when it fails.

Later patches will need to detect errors when registering buffers but an
immediate advantage is that error_report() calls are no longer needed in
block driver .bdrv_register_buf() functions.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20221013185908.1297568-8-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi
2022-10-13 14:59:02 -04:00
parent e8b6535533
commit f4ec04bae9
7 changed files with 52 additions and 18 deletions
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5
include/block/block-global-state.h
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@@ -246,8 +246,11 @@ void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp);
*
* Buffers must not overlap and they must be unregistered with the same <host,
* size> values that they were registered with.
*
* Returns: true on success, false on failure
*/
void bdrv_register_buf(BlockDriverState *bs, void *host, size_t size);
bool bdrv_register_buf(BlockDriverState *bs, void *host, size_t size,
Error **errp);
void bdrv_unregister_buf(BlockDriverState *bs, void *host, size_t size);
void bdrv_cancel_in_flight(BlockDriverState *bs);