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block: plug whole tree at once, introduce bdrv_io_unplugged_begin/end

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Extract the handling of io_plug "depth" from linux-aio.c and let the
main bdrv_drain loop do nothing but wait on I/O.

Like the two newly introduced functions, bdrv_io_plug and bdrv_io_unplug
now operate on all children.  The visit order is now symmetrical between
plug and unplug, making it possible for formats to implement plug/unplug.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-04-07 18:33:34 +02:00 • committed by Kevin Wolf
parent ce0f141259
commit 6b98bd6495
6 changed files with 71 additions and 44 deletions
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3
include/block/block.h
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@ -520,7 +520,8 @@ int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo);
void bdrv_io_plug(BlockDriverState *bs);
void bdrv_io_unplug(BlockDriverState *bs);
void bdrv_flush_io_queue(BlockDriverState *bs);
void bdrv_io_unplugged_begin(BlockDriverState *bs);
void bdrv_io_unplugged_end(BlockDriverState *bs);
/**
* bdrv_drained_begin: