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linux-aio: add dev_max_batch parameter to laio_co_submit()

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This new parameter can be used by block devices to limit the
Linux AIO batch size more than the limit set by the AIO context.

file-posix backend supports this, passing its `aio-max-batch` option
previously added.

Add an helper function to calculate the maximum batch size.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20211026162346.253081-3-sgarzare@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefano Garzarella 2021-10-26 18:23:45 +02:00 • committed by Kevin Wolf
parent 684960d462
commit 512da21101
3 changed files with 26 additions and 10 deletions
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3
include/block/raw-aio.h
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@ -51,7 +51,8 @@ typedef struct LinuxAioState LinuxAioState;
LinuxAioState *laio_init(Error **errp);
void laio_cleanup(LinuxAioState *s);
int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
uint64_t offset, QEMUIOVector *qiov, int type);
uint64_t offset, QEMUIOVector *qiov, int type,
uint64_t dev_max_batch);
void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context);
void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context);
void laio_io_plug(BlockDriverState *bs, LinuxAioState *s);