0e2402452f
No reason to limit buffered copy to one cluster. Let's allow up to 1 MiB. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 20191022111805.3432-7-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
97 lines
3.2 KiB
C
97 lines
3.2 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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typedef struct BlockCopyInFlightReq {
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int64_t start_byte;
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int64_t end_byte;
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QLIST_ENTRY(BlockCopyInFlightReq) list;
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CoQueue wait_queue; /* coroutines blocked on this request */
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} BlockCopyInFlightReq;
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typedef void (*ProgressBytesCallbackFunc)(int64_t bytes, void *opaque);
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typedef void (*ProgressResetCallbackFunc)(void *opaque);
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typedef struct BlockCopyState {
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/*
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* BdrvChild objects are not owned or managed by block-copy. They are
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* provided by block-copy user and user is responsible for appropriate
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* permissions on these children.
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*/
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BdrvChild *source;
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BdrvChild *target;
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BdrvDirtyBitmap *copy_bitmap;
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int64_t cluster_size;
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bool use_copy_range;
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int64_t copy_size;
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uint64_t len;
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QLIST_HEAD(, BlockCopyInFlightReq) inflight_reqs;
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BdrvRequestFlags write_flags;
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/*
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* skip_unallocated:
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*
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* Used by sync=top jobs, which first scan the source node for unallocated
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* areas and clear them in the copy_bitmap. During this process, the bitmap
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* is thus not fully initialized: It may still have bits set for areas that
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* are unallocated and should actually not be copied.
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*
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* This is indicated by skip_unallocated.
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*
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* In this case, block_copy() will query the source’s allocation status,
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* skip unallocated regions, clear them in the copy_bitmap, and invoke
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* block_copy_reset_unallocated() every time it does.
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*/
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bool skip_unallocated;
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/* progress_bytes_callback: called when some copying progress is done. */
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ProgressBytesCallbackFunc progress_bytes_callback;
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/*
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* progress_reset_callback: called when some bytes reset from copy_bitmap
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* (see @skip_unallocated above). The callee is assumed to recalculate how
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* many bytes remain based on the dirty bit count of copy_bitmap.
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*/
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ProgressResetCallbackFunc progress_reset_callback;
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void *progress_opaque;
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SharedResource *mem;
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} BlockCopyState;
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BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
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int64_t cluster_size,
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BdrvRequestFlags write_flags,
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Error **errp);
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void block_copy_set_callbacks(
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BlockCopyState *s,
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ProgressBytesCallbackFunc progress_bytes_callback,
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ProgressResetCallbackFunc progress_reset_callback,
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void *progress_opaque);
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void block_copy_state_free(BlockCopyState *s);
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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 start, uint64_t bytes,
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bool *error_is_read);
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#endif /* BLOCK_COPY_H */
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