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/*
* block_copy API
*
* Copyright (C) 2013 Proxmox Server Solutions
* Copyright (c) 2019 Virtuozzo International GmbH.
*
* Authors:
* Dietmar Maurer (dietmar@proxmox.com)
* Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef BLOCK_COPY_H
#define BLOCK_COPY_H
#include "block/block.h"
#include "qemu/co-shared-resource.h"
typedef struct BlockCopyInFlightReq {
int64_t start_byte;
int64_t end_byte;
QLIST_ENTRY(BlockCopyInFlightReq) list;
CoQueue wait_queue; /* coroutines blocked on this request */
} BlockCopyInFlightReq;
typedef void (*ProgressBytesCallbackFunc)(int64_t bytes, void *opaque);
typedef void (*ProgressResetCallbackFunc)(void *opaque);
typedef struct BlockCopyState {
/*
* BdrvChild objects are not owned or managed by block-copy. They are
* provided by block-copy user and user is responsible for appropriate
* permissions on these children.
*/
BdrvChild *source;
BdrvChild *target;
BdrvDirtyBitmap *copy_bitmap;
int64_t cluster_size;
bool use_copy_range;
int64_t copy_size;
uint64_t len;
QLIST_HEAD(, BlockCopyInFlightReq) inflight_reqs;
BdrvRequestFlags write_flags;
/*
* skip_unallocated:
*
* Used by sync=top jobs, which first scan the source node for unallocated
* areas and clear them in the copy_bitmap. During this process, the bitmap
* is thus not fully initialized: It may still have bits set for areas that
* are unallocated and should actually not be copied.
*
* This is indicated by skip_unallocated.
*
* In this case, block_copy() will query the source’s allocation status,
* skip unallocated regions, clear them in the copy_bitmap, and invoke
* block_copy_reset_unallocated() every time it does.
*/
bool skip_unallocated;
/* progress_bytes_callback: called when some copying progress is done. */
ProgressBytesCallbackFunc progress_bytes_callback;
/*
* progress_reset_callback: called when some bytes reset from copy_bitmap
* (see @skip_unallocated above). The callee is assumed to recalculate how
* many bytes remain based on the dirty bit count of copy_bitmap.
*/
ProgressResetCallbackFunc progress_reset_callback;
void *progress_opaque;
SharedResource *mem;
} BlockCopyState;
BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
int64_t cluster_size,
BdrvRequestFlags write_flags,
Error **errp);
void block_copy_set_callbacks(
BlockCopyState *s,
ProgressBytesCallbackFunc progress_bytes_callback,
ProgressResetCallbackFunc progress_reset_callback,
void *progress_opaque);
void block_copy_state_free(BlockCopyState *s);
int64_t block_copy_reset_unallocated(BlockCopyState *s,
int64_t offset, int64_t *count);
int coroutine_fn block_copy(BlockCopyState *s, int64_t start, uint64_t bytes,
bool *error_is_read);
#endif /* BLOCK_COPY_H */
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