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15df6e6987
Add possibility to limit block_copy() call in time. To be used in the next commit. As timed-out block_copy() call will continue in background anyway (we can't immediately cancel IO operation), it's important also give user a possibility to pass a callback, to do some additional actions on block-copy call finish. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@openvz.org> Reviewed-by: Hanna Reitz <hreitz@redhat.com> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
101 lines
3.7 KiB
C
101 lines
3.7 KiB
C
/*
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* block_copy API
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*
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* Copyright (C) 2013 Proxmox Server Solutions
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* Copyright (c) 2019 Virtuozzo International GmbH.
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*
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* Authors:
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* Dietmar Maurer (dietmar@proxmox.com)
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* Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef BLOCK_COPY_H
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#define BLOCK_COPY_H
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#include "block/block.h"
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#include "qemu/co-shared-resource.h"
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/* All APIs are thread-safe */
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typedef void (*BlockCopyAsyncCallbackFunc)(void *opaque);
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typedef struct BlockCopyState BlockCopyState;
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typedef struct BlockCopyCallState BlockCopyCallState;
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BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
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const BdrvDirtyBitmap *bitmap,
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Error **errp);
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/* Function should be called prior any actual copy request */
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void block_copy_set_copy_opts(BlockCopyState *s, bool use_copy_range,
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bool compress);
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void block_copy_set_progress_meter(BlockCopyState *s, ProgressMeter *pm);
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void block_copy_state_free(BlockCopyState *s);
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void block_copy_reset(BlockCopyState *s, int64_t offset, int64_t bytes);
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int64_t block_copy_reset_unallocated(BlockCopyState *s,
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int64_t offset, int64_t *count);
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int coroutine_fn block_copy(BlockCopyState *s, int64_t offset, int64_t bytes,
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bool ignore_ratelimit, uint64_t timeout_ns,
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BlockCopyAsyncCallbackFunc cb,
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void *cb_opaque);
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/*
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* Run block-copy in a coroutine, create corresponding BlockCopyCallState
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* object and return pointer to it. Never returns NULL.
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*
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* Caller is responsible to call block_copy_call_free() to free
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* BlockCopyCallState object.
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*
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* @max_workers means maximum of parallel coroutines to execute sub-requests,
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* must be > 0.
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*
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* @max_chunk means maximum length for one IO operation. Zero means unlimited.
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*/
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BlockCopyCallState *block_copy_async(BlockCopyState *s,
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int64_t offset, int64_t bytes,
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int max_workers, int64_t max_chunk,
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BlockCopyAsyncCallbackFunc cb,
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void *cb_opaque);
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/*
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* Free finished BlockCopyCallState. Trying to free running
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* block-copy will crash.
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*/
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void block_copy_call_free(BlockCopyCallState *call_state);
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/*
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* Note, that block-copy call is marked finished prior to calling
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* the callback.
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*/
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bool block_copy_call_finished(BlockCopyCallState *call_state);
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bool block_copy_call_succeeded(BlockCopyCallState *call_state);
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bool block_copy_call_failed(BlockCopyCallState *call_state);
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bool block_copy_call_cancelled(BlockCopyCallState *call_state);
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int block_copy_call_status(BlockCopyCallState *call_state, bool *error_is_read);
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void block_copy_set_speed(BlockCopyState *s, uint64_t speed);
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void block_copy_kick(BlockCopyCallState *call_state);
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/*
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* Cancel running block-copy call.
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*
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* Cancel leaves block-copy state valid: dirty bits are correct and you may use
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* cancel + <run block_copy with same parameters> to emulate pause/resume.
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*
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* Note also, that the cancel is async: it only marks block-copy call to be
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* cancelled. So, the call may be cancelled (block_copy_call_cancelled() reports
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* true) but not yet finished (block_copy_call_finished() reports false).
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*/
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void block_copy_call_cancel(BlockCopyCallState *call_state);
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BdrvDirtyBitmap *block_copy_dirty_bitmap(BlockCopyState *s);
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int64_t block_copy_cluster_size(BlockCopyState *s);
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void block_copy_set_skip_unallocated(BlockCopyState *s, bool skip);
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#endif /* BLOCK_COPY_H */
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