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block: introduce bdrv_no_throttling_begin/end

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Extract the handling of throttling from bdrv_flush_io_queue.  These
new functions will soon become BdrvChildRole callbacks, as they can
be generalized to "beginning of drain" and "end of drain".

Reviewed-by: Alberto Garcia <berto@igalia.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 18:33:33 +02:00 • committed by Kevin Wolf
parent b6e84c97ed
commit ce0f141259
5 changed files with 33 additions and 20 deletions
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6
block/block-backend.c
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@ -794,7 +794,6 @@ int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
int nb_sectors)
{
BlockDriverState *bs = blk_bs(blk);
bool enabled;
int ret;
ret = blk_check_request(blk, sector_num, nb_sectors);
@ -802,10 +801,9 @@ int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
return ret;
}
enabled = bs->io_limits_enabled;
bs->io_limits_enabled = false;
bdrv_no_throttling_begin(bs);
ret = blk_read(blk, sector_num, buf, nb_sectors);
bs->io_limits_enabled = enabled;
bdrv_no_throttling_end(bs);
return ret;
}