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block: assert that graph read and writes are performed correctly

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Remove the old assert_bdrv_graph_writable, and replace it with
the new version using graph-lock API.

See the function documentation for more information.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20221207131838.239125-14-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2022-12-07 14:18:33 +01:00 • committed by Kevin Wolf
parent 1af8239235
commit 3f35f82e04
4 changed files with 28 additions and 19 deletions
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15
include/block/graph-lock.h
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@ -135,6 +135,21 @@ void coroutine_fn bdrv_graph_co_rdunlock(void);
void bdrv_graph_rdlock_main_loop(void);
void bdrv_graph_rdunlock_main_loop(void);
/*
* assert_bdrv_graph_readable:
* Make sure that the reader is either the main loop,
* or there is at least a reader helding the rdlock.
* In this way an incoming writer is aware of the read and waits.
*/
void assert_bdrv_graph_readable(void);
/*
* assert_bdrv_graph_writable:
* Make sure that the writer is the main loop and has set @has_writer,
* so that incoming readers will pause.
*/
void assert_bdrv_graph_writable(void);
typedef struct GraphLockable { } GraphLockable;
/*