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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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5
include/block/block_int.h
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@ -294,7 +294,6 @@ struct BlockDriver {
/* io queue for linux-aio */
void (*bdrv_io_plug)(BlockDriverState *bs);
void (*bdrv_io_unplug)(BlockDriverState *bs);
void (*bdrv_flush_io_queue)(BlockDriverState *bs);
/**
* Try to get @bs's logical and physical block size.
@ -484,6 +483,10 @@ struct BlockDriverState {
uint64_t write_threshold_offset;
NotifierWithReturn write_threshold_notifier;
/* counters for nested bdrv_io_plug and bdrv_io_unplugged_begin */
unsigned io_plugged;
unsigned io_plug_disabled;
int quiesce_counter;
};