mirror of https://gitee.com/openkylin/qemu.git
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
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* QEMU System Emulator block write threshold notification
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*
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* Copyright Red Hat, Inc. 2014
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*
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* Authors:
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* Francesco Romani <fromani@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "block/block_int.h"
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#include "block/write-threshold.h"
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#include "qapi/error.h"
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#include "qapi/qapi-commands-block-core.h"
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#include "qapi/qapi-events-block-core.h"
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uint64_t bdrv_write_threshold_get(const BlockDriverState *bs)
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{
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return bs->write_threshold_offset;
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}
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void bdrv_write_threshold_set(BlockDriverState *bs, uint64_t threshold_bytes)
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{
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bs->write_threshold_offset = threshold_bytes;
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}
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void qmp_block_set_write_threshold(const char *node_name,
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uint64_t threshold_bytes,
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Error **errp)
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{
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BlockDriverState *bs;
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AioContext *aio_context;
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bs = bdrv_find_node(node_name);
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if (!bs) {
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error_setg(errp, "Device '%s' not found", node_name);
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return;
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}
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aio_context = bdrv_get_aio_context(bs);
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aio_context_acquire(aio_context);
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bdrv_write_threshold_set(bs, threshold_bytes);
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aio_context_release(aio_context);
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}
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void bdrv_write_threshold_check_write(BlockDriverState *bs, int64_t offset,
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int64_t bytes)
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{
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int64_t end = offset + bytes;
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uint64_t wtr = bs->write_threshold_offset;
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if (wtr > 0 && end > wtr) {
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qapi_event_send_block_write_threshold(bs->node_name, end - wtr, wtr);
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/* autodisable to avoid flooding the monitor */
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bdrv_write_threshold_set(bs, 0);
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}
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}
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