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2e0e9cbd89
bdrv_write_threshold_exceeded() is unused. bdrv_write_threshold_is_set() is used only to double check the value of bs->write_threshold_offset in tests. No real sense in it (both tests do check real value with help of bdrv_write_threshold_get()) Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20210506090621.11848-5-vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> [mreitz: Adjusted commit message as per Eric's suggestion] Signed-off-by: Max Reitz <mreitz@redhat.com>
48 lines
1.3 KiB
C
48 lines
1.3 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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#ifndef BLOCK_WRITE_THRESHOLD_H
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#define BLOCK_WRITE_THRESHOLD_H
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#include "block/block_int.h"
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/*
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* bdrv_write_threshold_set:
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*
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* Set the write threshold for block devices, in bytes.
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* Notify when a write exceeds the threshold, meaning the device
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* is becoming full, so it can be transparently resized.
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* To be used with thin-provisioned block devices.
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*
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* Use threshold_bytes == 0 to disable.
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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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* bdrv_write_threshold_get
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*
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* Get the configured write threshold, in bytes.
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* Zero means no threshold configured.
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*/
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uint64_t bdrv_write_threshold_get(const BlockDriverState *bs);
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/*
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* bdrv_write_threshold_check_write
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*
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* Check whether the specified request exceeds the write threshold.
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* If so, send a corresponding event and disable write threshold checking.
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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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#endif
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