block: block: introduce APIs for submitting IO as a batch
This patch introduces three APIs so that following patches can support queuing I/O requests and submitting them as a batch for improving I/O performance. Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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block.c
31
block.c
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@ -1905,6 +1905,7 @@ void bdrv_drain_all(void)
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bool bs_busy;
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bool bs_busy;
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aio_context_acquire(aio_context);
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aio_context_acquire(aio_context);
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bdrv_flush_io_queue(bs);
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bdrv_start_throttled_reqs(bs);
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bdrv_start_throttled_reqs(bs);
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bs_busy = bdrv_requests_pending(bs);
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bs_busy = bdrv_requests_pending(bs);
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bs_busy |= aio_poll(aio_context, bs_busy);
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bs_busy |= aio_poll(aio_context, bs_busy);
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@ -5782,3 +5783,33 @@ BlockDriverState *check_to_replace_node(const char *node_name, Error **errp)
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return to_replace_bs;
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return to_replace_bs;
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}
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}
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void bdrv_io_plug(BlockDriverState *bs)
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{
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BlockDriver *drv = bs->drv;
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if (drv && drv->bdrv_io_plug) {
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drv->bdrv_io_plug(bs);
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} else if (bs->file) {
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bdrv_io_plug(bs->file);
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}
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}
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void bdrv_io_unplug(BlockDriverState *bs)
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{
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BlockDriver *drv = bs->drv;
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if (drv && drv->bdrv_io_unplug) {
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drv->bdrv_io_unplug(bs);
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} else if (bs->file) {
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bdrv_io_unplug(bs->file);
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}
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}
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void bdrv_flush_io_queue(BlockDriverState *bs)
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{
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BlockDriver *drv = bs->drv;
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if (drv && drv->bdrv_flush_io_queue) {
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drv->bdrv_flush_io_queue(bs);
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} else if (bs->file) {
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bdrv_flush_io_queue(bs->file);
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}
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}
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@ -584,4 +584,8 @@ AioContext *bdrv_get_aio_context(BlockDriverState *bs);
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*/
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*/
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void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context);
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void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context);
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void bdrv_io_plug(BlockDriverState *bs);
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void bdrv_io_unplug(BlockDriverState *bs);
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void bdrv_flush_io_queue(BlockDriverState *bs);
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#endif
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#endif
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@ -261,6 +261,11 @@ struct BlockDriver {
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void (*bdrv_attach_aio_context)(BlockDriverState *bs,
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void (*bdrv_attach_aio_context)(BlockDriverState *bs,
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AioContext *new_context);
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AioContext *new_context);
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/* io queue for linux-aio */
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void (*bdrv_io_plug)(BlockDriverState *bs);
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void (*bdrv_io_unplug)(BlockDriverState *bs);
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void (*bdrv_flush_io_queue)(BlockDriverState *bs);
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QLIST_ENTRY(BlockDriver) list;
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QLIST_ENTRY(BlockDriver) list;
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};
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};
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