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94783301b8
write-notifiers are used only for write-threshold. New code for such purpose should create filters. Let's better special-case write-threshold and drop write notifiers at all. (Actually, write-threshold is special-cased anyway, as the only user of write-notifiers) So, create a new direct interface for bdrv_co_write_req_prepare() and drop all write-notifier related logic from write-threshold.c. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20210506090621.11848-2-vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> [mreitz: Adjusted comment as per Eric's suggestion] Signed-off-by: Max Reitz <mreitz@redhat.com>
72 lines
2 KiB
C
72 lines
2 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_is_set
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*
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* Tell if a write threshold is set for a given BDS.
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*/
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bool bdrv_write_threshold_is_set(const BlockDriverState *bs);
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/*
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* bdrv_write_threshold_exceeded
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*
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* Return the extent of a write request that exceeded the threshold,
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* or zero if the request is below the threshold.
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* Return zero also if the threshold was not set.
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*
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* NOTE: here we assume the following holds for each request this code
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* deals with:
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*
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* assert((req->offset + req->bytes) <= UINT64_MAX)
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*
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* Please not there is *not* an actual C assert().
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*/
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uint64_t bdrv_write_threshold_exceeded(const BlockDriverState *bs,
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const BdrvTrackedRequest *req);
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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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