1 /* 2 * block_copy API 3 * 4 * Copyright (C) 2013 Proxmox Server Solutions 5 * Copyright (c) 2019 Virtuozzo International GmbH. 6 * 7 * Authors: 8 * Dietmar Maurer (dietmar@proxmox.com) 9 * Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> 10 * 11 * This work is licensed under the terms of the GNU GPL, version 2 or later. 12 * See the COPYING file in the top-level directory. 13 */ 14 15 #ifndef BLOCK_COPY_H 16 #define BLOCK_COPY_H 17 18 #include "block/block.h" 19 #include "qemu/co-shared-resource.h" 20 21 /* All APIs are thread-safe */ 22 23 typedef void (*BlockCopyAsyncCallbackFunc)(void *opaque); 24 typedef struct BlockCopyState BlockCopyState; 25 typedef struct BlockCopyCallState BlockCopyCallState; 26 27 BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target, 28 const BdrvDirtyBitmap *bitmap, 29 Error **errp); 30 31 /* Function should be called prior any actual copy request */ 32 void block_copy_set_copy_opts(BlockCopyState *s, bool use_copy_range, 33 bool compress); 34 void block_copy_set_progress_meter(BlockCopyState *s, ProgressMeter *pm); 35 36 void block_copy_state_free(BlockCopyState *s); 37 38 void block_copy_reset(BlockCopyState *s, int64_t offset, int64_t bytes); 39 int64_t block_copy_reset_unallocated(BlockCopyState *s, 40 int64_t offset, int64_t *count); 41 42 int coroutine_fn block_copy(BlockCopyState *s, int64_t offset, int64_t bytes, 43 bool ignore_ratelimit); 44 45 /* 46 * Run block-copy in a coroutine, create corresponding BlockCopyCallState 47 * object and return pointer to it. Never returns NULL. 48 * 49 * Caller is responsible to call block_copy_call_free() to free 50 * BlockCopyCallState object. 51 * 52 * @max_workers means maximum of parallel coroutines to execute sub-requests, 53 * must be > 0. 54 * 55 * @max_chunk means maximum length for one IO operation. Zero means unlimited. 56 */ 57 BlockCopyCallState *block_copy_async(BlockCopyState *s, 58 int64_t offset, int64_t bytes, 59 int max_workers, int64_t max_chunk, 60 BlockCopyAsyncCallbackFunc cb, 61 void *cb_opaque); 62 63 /* 64 * Free finished BlockCopyCallState. Trying to free running 65 * block-copy will crash. 66 */ 67 void block_copy_call_free(BlockCopyCallState *call_state); 68 69 /* 70 * Note, that block-copy call is marked finished prior to calling 71 * the callback. 72 */ 73 bool block_copy_call_finished(BlockCopyCallState *call_state); 74 bool block_copy_call_succeeded(BlockCopyCallState *call_state); 75 bool block_copy_call_failed(BlockCopyCallState *call_state); 76 bool block_copy_call_cancelled(BlockCopyCallState *call_state); 77 int block_copy_call_status(BlockCopyCallState *call_state, bool *error_is_read); 78 79 void block_copy_set_speed(BlockCopyState *s, uint64_t speed); 80 void block_copy_kick(BlockCopyCallState *call_state); 81 82 /* 83 * Cancel running block-copy call. 84 * 85 * Cancel leaves block-copy state valid: dirty bits are correct and you may use 86 * cancel + <run block_copy with same parameters> to emulate pause/resume. 87 * 88 * Note also, that the cancel is async: it only marks block-copy call to be 89 * cancelled. So, the call may be cancelled (block_copy_call_cancelled() reports 90 * true) but not yet finished (block_copy_call_finished() reports false). 91 */ 92 void block_copy_call_cancel(BlockCopyCallState *call_state); 93 94 BdrvDirtyBitmap *block_copy_dirty_bitmap(BlockCopyState *s); 95 int64_t block_copy_cluster_size(BlockCopyState *s); 96 void block_copy_set_skip_unallocated(BlockCopyState *s, bool skip); 97 98 #endif /* BLOCK_COPY_H */ 99