1893f7ebaSPaolo Bonzini /* 2893f7ebaSPaolo Bonzini * Image mirroring 3893f7ebaSPaolo Bonzini * 4893f7ebaSPaolo Bonzini * Copyright Red Hat, Inc. 2012 5893f7ebaSPaolo Bonzini * 6893f7ebaSPaolo Bonzini * Authors: 7893f7ebaSPaolo Bonzini * Paolo Bonzini <pbonzini@redhat.com> 8893f7ebaSPaolo Bonzini * 9893f7ebaSPaolo Bonzini * This work is licensed under the terms of the GNU LGPL, version 2 or later. 10893f7ebaSPaolo Bonzini * See the COPYING.LIB file in the top-level directory. 11893f7ebaSPaolo Bonzini * 12893f7ebaSPaolo Bonzini */ 13893f7ebaSPaolo Bonzini 1480c71a24SPeter Maydell #include "qemu/osdep.h" 15893f7ebaSPaolo Bonzini #include "trace.h" 16c87621eaSJohn Snow #include "block/blockjob_int.h" 17737e150eSPaolo Bonzini #include "block/block_int.h" 18373340b2SMax Reitz #include "sysemu/block-backend.h" 19da34e65cSMarkus Armbruster #include "qapi/error.h" 20cc7a8ea7SMarkus Armbruster #include "qapi/qmp/qerror.h" 21893f7ebaSPaolo Bonzini #include "qemu/ratelimit.h" 22b812f671SPaolo Bonzini #include "qemu/bitmap.h" 23893f7ebaSPaolo Bonzini 24893f7ebaSPaolo Bonzini #define SLICE_TIME 100000000ULL /* ns */ 25402a4741SPaolo Bonzini #define MAX_IN_FLIGHT 16 260965a41eSVladimir Sementsov-Ogievskiy #define MAX_IO_SECTORS ((1 << 20) >> BDRV_SECTOR_BITS) /* 1 Mb */ 270965a41eSVladimir Sementsov-Ogievskiy #define DEFAULT_MIRROR_BUF_SIZE \ 280965a41eSVladimir Sementsov-Ogievskiy (MAX_IN_FLIGHT * MAX_IO_SECTORS * BDRV_SECTOR_SIZE) 29402a4741SPaolo Bonzini 30402a4741SPaolo Bonzini /* The mirroring buffer is a list of granularity-sized chunks. 31402a4741SPaolo Bonzini * Free chunks are organized in a list. 32402a4741SPaolo Bonzini */ 33402a4741SPaolo Bonzini typedef struct MirrorBuffer { 34402a4741SPaolo Bonzini QSIMPLEQ_ENTRY(MirrorBuffer) next; 35402a4741SPaolo Bonzini } MirrorBuffer; 36893f7ebaSPaolo Bonzini 37893f7ebaSPaolo Bonzini typedef struct MirrorBlockJob { 38893f7ebaSPaolo Bonzini BlockJob common; 39893f7ebaSPaolo Bonzini RateLimit limit; 40e253f4b8SKevin Wolf BlockBackend *target; 415bc361b8SFam Zheng BlockDriverState *base; 4209158f00SBenoît Canet /* The name of the graph node to replace */ 4309158f00SBenoît Canet char *replaces; 4409158f00SBenoît Canet /* The BDS to replace */ 4509158f00SBenoît Canet BlockDriverState *to_replace; 4609158f00SBenoît Canet /* Used to block operations on the drive-mirror-replace target */ 4709158f00SBenoît Canet Error *replace_blocker; 4803544a6eSFam Zheng bool is_none_mode; 49274fcceeSMax Reitz BlockMirrorBackingMode backing_mode; 50b952b558SPaolo Bonzini BlockdevOnError on_source_error, on_target_error; 51d63ffd87SPaolo Bonzini bool synced; 52d63ffd87SPaolo Bonzini bool should_complete; 53eee13dfeSPaolo Bonzini int64_t granularity; 54b812f671SPaolo Bonzini size_t buf_size; 55b21c7652SMax Reitz int64_t bdev_length; 56b812f671SPaolo Bonzini unsigned long *cow_bitmap; 57e4654d2dSFam Zheng BdrvDirtyBitmap *dirty_bitmap; 58dc162c8eSFam Zheng BdrvDirtyBitmapIter *dbi; 59893f7ebaSPaolo Bonzini uint8_t *buf; 60402a4741SPaolo Bonzini QSIMPLEQ_HEAD(, MirrorBuffer) buf_free; 61402a4741SPaolo Bonzini int buf_free_count; 62bd48bde8SPaolo Bonzini 6349efb1f5SDenis V. Lunev uint64_t last_pause_ns; 64402a4741SPaolo Bonzini unsigned long *in_flight_bitmap; 65bd48bde8SPaolo Bonzini int in_flight; 66531509baSDenis V. Lunev int64_t sectors_in_flight; 67bd48bde8SPaolo Bonzini int ret; 680fc9f8eaSFam Zheng bool unmap; 69e424aff5SKevin Wolf bool waiting_for_io; 70e5b43573SFam Zheng int target_cluster_sectors; 71e5b43573SFam Zheng int max_iov; 7290ab48ebSAnton Nefedov bool initial_zeroing_ongoing; 73893f7ebaSPaolo Bonzini } MirrorBlockJob; 74893f7ebaSPaolo Bonzini 75bd48bde8SPaolo Bonzini typedef struct MirrorOp { 76bd48bde8SPaolo Bonzini MirrorBlockJob *s; 77bd48bde8SPaolo Bonzini QEMUIOVector qiov; 78bd48bde8SPaolo Bonzini int64_t sector_num; 79bd48bde8SPaolo Bonzini int nb_sectors; 80bd48bde8SPaolo Bonzini } MirrorOp; 81bd48bde8SPaolo Bonzini 82b952b558SPaolo Bonzini static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read, 83b952b558SPaolo Bonzini int error) 84b952b558SPaolo Bonzini { 85b952b558SPaolo Bonzini s->synced = false; 86b952b558SPaolo Bonzini if (read) { 8781e254dcSKevin Wolf return block_job_error_action(&s->common, s->on_source_error, 8881e254dcSKevin Wolf true, error); 89b952b558SPaolo Bonzini } else { 9081e254dcSKevin Wolf return block_job_error_action(&s->common, s->on_target_error, 9181e254dcSKevin Wolf false, error); 92b952b558SPaolo Bonzini } 93b952b558SPaolo Bonzini } 94b952b558SPaolo Bonzini 95bd48bde8SPaolo Bonzini static void mirror_iteration_done(MirrorOp *op, int ret) 96bd48bde8SPaolo Bonzini { 97bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 98402a4741SPaolo Bonzini struct iovec *iov; 99bd48bde8SPaolo Bonzini int64_t chunk_num; 100402a4741SPaolo Bonzini int i, nb_chunks, sectors_per_chunk; 101bd48bde8SPaolo Bonzini 102bd48bde8SPaolo Bonzini trace_mirror_iteration_done(s, op->sector_num, op->nb_sectors, ret); 103bd48bde8SPaolo Bonzini 104bd48bde8SPaolo Bonzini s->in_flight--; 105b21c7652SMax Reitz s->sectors_in_flight -= op->nb_sectors; 106402a4741SPaolo Bonzini iov = op->qiov.iov; 107402a4741SPaolo Bonzini for (i = 0; i < op->qiov.niov; i++) { 108402a4741SPaolo Bonzini MirrorBuffer *buf = (MirrorBuffer *) iov[i].iov_base; 109402a4741SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&s->buf_free, buf, next); 110402a4741SPaolo Bonzini s->buf_free_count++; 111402a4741SPaolo Bonzini } 112402a4741SPaolo Bonzini 113bd48bde8SPaolo Bonzini sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 114bd48bde8SPaolo Bonzini chunk_num = op->sector_num / sectors_per_chunk; 1154150ae60SFam Zheng nb_chunks = DIV_ROUND_UP(op->nb_sectors, sectors_per_chunk); 116402a4741SPaolo Bonzini bitmap_clear(s->in_flight_bitmap, chunk_num, nb_chunks); 117b21c7652SMax Reitz if (ret >= 0) { 118b21c7652SMax Reitz if (s->cow_bitmap) { 119bd48bde8SPaolo Bonzini bitmap_set(s->cow_bitmap, chunk_num, nb_chunks); 120bd48bde8SPaolo Bonzini } 12190ab48ebSAnton Nefedov if (!s->initial_zeroing_ongoing) { 122b21c7652SMax Reitz s->common.offset += (uint64_t)op->nb_sectors * BDRV_SECTOR_SIZE; 123b21c7652SMax Reitz } 12490ab48ebSAnton Nefedov } 1256df3bf8eSZhang Min qemu_iovec_destroy(&op->qiov); 126c84b3192SPaolo Bonzini g_free(op); 1277b770c72SStefan Hajnoczi 128e424aff5SKevin Wolf if (s->waiting_for_io) { 1290b8b8753SPaolo Bonzini qemu_coroutine_enter(s->common.co); 130bd48bde8SPaolo Bonzini } 1317b770c72SStefan Hajnoczi } 132bd48bde8SPaolo Bonzini 133bd48bde8SPaolo Bonzini static void mirror_write_complete(void *opaque, int ret) 134bd48bde8SPaolo Bonzini { 135bd48bde8SPaolo Bonzini MirrorOp *op = opaque; 136bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 137b9e413ddSPaolo Bonzini 138b9e413ddSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->common.blk)); 139bd48bde8SPaolo Bonzini if (ret < 0) { 140bd48bde8SPaolo Bonzini BlockErrorAction action; 141bd48bde8SPaolo Bonzini 14220dca810SJohn Snow bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors); 143bd48bde8SPaolo Bonzini action = mirror_error_action(s, false, -ret); 144a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { 145bd48bde8SPaolo Bonzini s->ret = ret; 146bd48bde8SPaolo Bonzini } 147bd48bde8SPaolo Bonzini } 148bd48bde8SPaolo Bonzini mirror_iteration_done(op, ret); 149b9e413ddSPaolo Bonzini aio_context_release(blk_get_aio_context(s->common.blk)); 150bd48bde8SPaolo Bonzini } 151bd48bde8SPaolo Bonzini 152bd48bde8SPaolo Bonzini static void mirror_read_complete(void *opaque, int ret) 153bd48bde8SPaolo Bonzini { 154bd48bde8SPaolo Bonzini MirrorOp *op = opaque; 155bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 156b9e413ddSPaolo Bonzini 157b9e413ddSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->common.blk)); 158bd48bde8SPaolo Bonzini if (ret < 0) { 159bd48bde8SPaolo Bonzini BlockErrorAction action; 160bd48bde8SPaolo Bonzini 16120dca810SJohn Snow bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors); 162bd48bde8SPaolo Bonzini action = mirror_error_action(s, true, -ret); 163a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { 164bd48bde8SPaolo Bonzini s->ret = ret; 165bd48bde8SPaolo Bonzini } 166bd48bde8SPaolo Bonzini 167bd48bde8SPaolo Bonzini mirror_iteration_done(op, ret); 168b9e413ddSPaolo Bonzini } else { 169e253f4b8SKevin Wolf blk_aio_pwritev(s->target, op->sector_num * BDRV_SECTOR_SIZE, &op->qiov, 17073698c30SEric Blake 0, mirror_write_complete, op); 171bd48bde8SPaolo Bonzini } 172b9e413ddSPaolo Bonzini aio_context_release(blk_get_aio_context(s->common.blk)); 173b9e413ddSPaolo Bonzini } 174bd48bde8SPaolo Bonzini 1754150ae60SFam Zheng static inline void mirror_clip_sectors(MirrorBlockJob *s, 1764150ae60SFam Zheng int64_t sector_num, 1774150ae60SFam Zheng int *nb_sectors) 1784150ae60SFam Zheng { 1794150ae60SFam Zheng *nb_sectors = MIN(*nb_sectors, 1804150ae60SFam Zheng s->bdev_length / BDRV_SECTOR_SIZE - sector_num); 1814150ae60SFam Zheng } 1824150ae60SFam Zheng 183e5b43573SFam Zheng /* Round sector_num and/or nb_sectors to target cluster if COW is needed, and 184e5b43573SFam Zheng * return the offset of the adjusted tail sector against original. */ 185e5b43573SFam Zheng static int mirror_cow_align(MirrorBlockJob *s, 186e5b43573SFam Zheng int64_t *sector_num, 187e5b43573SFam Zheng int *nb_sectors) 188893f7ebaSPaolo Bonzini { 189e5b43573SFam Zheng bool need_cow; 190e5b43573SFam Zheng int ret = 0; 191e5b43573SFam Zheng int chunk_sectors = s->granularity >> BDRV_SECTOR_BITS; 192e5b43573SFam Zheng int64_t align_sector_num = *sector_num; 193e5b43573SFam Zheng int align_nb_sectors = *nb_sectors; 194e5b43573SFam Zheng int max_sectors = chunk_sectors * s->max_iov; 195893f7ebaSPaolo Bonzini 196e5b43573SFam Zheng need_cow = !test_bit(*sector_num / chunk_sectors, s->cow_bitmap); 197e5b43573SFam Zheng need_cow |= !test_bit((*sector_num + *nb_sectors - 1) / chunk_sectors, 198e5b43573SFam Zheng s->cow_bitmap); 199e5b43573SFam Zheng if (need_cow) { 200244483e6SKevin Wolf bdrv_round_sectors_to_clusters(blk_bs(s->target), *sector_num, 201244483e6SKevin Wolf *nb_sectors, &align_sector_num, 202244483e6SKevin Wolf &align_nb_sectors); 2038f0720ecSPaolo Bonzini } 2048f0720ecSPaolo Bonzini 205e5b43573SFam Zheng if (align_nb_sectors > max_sectors) { 206e5b43573SFam Zheng align_nb_sectors = max_sectors; 207e5b43573SFam Zheng if (need_cow) { 208e5b43573SFam Zheng align_nb_sectors = QEMU_ALIGN_DOWN(align_nb_sectors, 209e5b43573SFam Zheng s->target_cluster_sectors); 210e5b43573SFam Zheng } 211e5b43573SFam Zheng } 2124150ae60SFam Zheng /* Clipping may result in align_nb_sectors unaligned to chunk boundary, but 2134150ae60SFam Zheng * that doesn't matter because it's already the end of source image. */ 2144150ae60SFam Zheng mirror_clip_sectors(s, align_sector_num, &align_nb_sectors); 215402a4741SPaolo Bonzini 216e5b43573SFam Zheng ret = align_sector_num + align_nb_sectors - (*sector_num + *nb_sectors); 217e5b43573SFam Zheng *sector_num = align_sector_num; 218e5b43573SFam Zheng *nb_sectors = align_nb_sectors; 219e5b43573SFam Zheng assert(ret >= 0); 220e5b43573SFam Zheng return ret; 221e5b43573SFam Zheng } 222e5b43573SFam Zheng 22321cd917fSFam Zheng static inline void mirror_wait_for_io(MirrorBlockJob *s) 22421cd917fSFam Zheng { 22521cd917fSFam Zheng assert(!s->waiting_for_io); 22621cd917fSFam Zheng s->waiting_for_io = true; 22721cd917fSFam Zheng qemu_coroutine_yield(); 22821cd917fSFam Zheng s->waiting_for_io = false; 22921cd917fSFam Zheng } 23021cd917fSFam Zheng 231e5b43573SFam Zheng /* Submit async read while handling COW. 23217612955SJohn Snow * Returns: The number of sectors copied after and including sector_num, 23317612955SJohn Snow * excluding any sectors copied prior to sector_num due to alignment. 23417612955SJohn Snow * This will be nb_sectors if no alignment is necessary, or 235e5b43573SFam Zheng * (new_end - sector_num) if tail is rounded up or down due to 236e5b43573SFam Zheng * alignment or buffer limit. 237402a4741SPaolo Bonzini */ 238e5b43573SFam Zheng static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num, 239e5b43573SFam Zheng int nb_sectors) 240e5b43573SFam Zheng { 241e253f4b8SKevin Wolf BlockBackend *source = s->common.blk; 242e5b43573SFam Zheng int sectors_per_chunk, nb_chunks; 24317612955SJohn Snow int ret; 244e5b43573SFam Zheng MirrorOp *op; 245e4808881SJohn Snow int max_sectors; 246402a4741SPaolo Bonzini 247e5b43573SFam Zheng sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 248e4808881SJohn Snow max_sectors = sectors_per_chunk * s->max_iov; 249e5b43573SFam Zheng 250e5b43573SFam Zheng /* We can only handle as much as buf_size at a time. */ 251e5b43573SFam Zheng nb_sectors = MIN(s->buf_size >> BDRV_SECTOR_BITS, nb_sectors); 252e4808881SJohn Snow nb_sectors = MIN(max_sectors, nb_sectors); 253e5b43573SFam Zheng assert(nb_sectors); 25417612955SJohn Snow ret = nb_sectors; 255e5b43573SFam Zheng 256e5b43573SFam Zheng if (s->cow_bitmap) { 257e5b43573SFam Zheng ret += mirror_cow_align(s, §or_num, &nb_sectors); 258e5b43573SFam Zheng } 259e5b43573SFam Zheng assert(nb_sectors << BDRV_SECTOR_BITS <= s->buf_size); 260e5b43573SFam Zheng /* The sector range must meet granularity because: 261e5b43573SFam Zheng * 1) Caller passes in aligned values; 262e5b43573SFam Zheng * 2) mirror_cow_align is used only when target cluster is larger. */ 263e5b43573SFam Zheng assert(!(sector_num % sectors_per_chunk)); 2644150ae60SFam Zheng nb_chunks = DIV_ROUND_UP(nb_sectors, sectors_per_chunk); 265e5b43573SFam Zheng 266e5b43573SFam Zheng while (s->buf_free_count < nb_chunks) { 267402a4741SPaolo Bonzini trace_mirror_yield_in_flight(s, sector_num, s->in_flight); 26821cd917fSFam Zheng mirror_wait_for_io(s); 269b812f671SPaolo Bonzini } 270b812f671SPaolo Bonzini 271bd48bde8SPaolo Bonzini /* Allocate a MirrorOp that is used as an AIO callback. */ 272c84b3192SPaolo Bonzini op = g_new(MirrorOp, 1); 273bd48bde8SPaolo Bonzini op->s = s; 274bd48bde8SPaolo Bonzini op->sector_num = sector_num; 275bd48bde8SPaolo Bonzini op->nb_sectors = nb_sectors; 276402a4741SPaolo Bonzini 277402a4741SPaolo Bonzini /* Now make a QEMUIOVector taking enough granularity-sized chunks 278402a4741SPaolo Bonzini * from s->buf_free. 279402a4741SPaolo Bonzini */ 280402a4741SPaolo Bonzini qemu_iovec_init(&op->qiov, nb_chunks); 281402a4741SPaolo Bonzini while (nb_chunks-- > 0) { 282402a4741SPaolo Bonzini MirrorBuffer *buf = QSIMPLEQ_FIRST(&s->buf_free); 283e5b43573SFam Zheng size_t remaining = nb_sectors * BDRV_SECTOR_SIZE - op->qiov.size; 2845a0f6fd5SKevin Wolf 285402a4741SPaolo Bonzini QSIMPLEQ_REMOVE_HEAD(&s->buf_free, next); 286402a4741SPaolo Bonzini s->buf_free_count--; 2875a0f6fd5SKevin Wolf qemu_iovec_add(&op->qiov, buf, MIN(s->granularity, remaining)); 288402a4741SPaolo Bonzini } 289402a4741SPaolo Bonzini 290893f7ebaSPaolo Bonzini /* Copy the dirty cluster. */ 291bd48bde8SPaolo Bonzini s->in_flight++; 292b21c7652SMax Reitz s->sectors_in_flight += nb_sectors; 293b812f671SPaolo Bonzini trace_mirror_one_iteration(s, sector_num, nb_sectors); 294dcfb3bebSFam Zheng 29573698c30SEric Blake blk_aio_preadv(source, sector_num * BDRV_SECTOR_SIZE, &op->qiov, 0, 296bd48bde8SPaolo Bonzini mirror_read_complete, op); 297e5b43573SFam Zheng return ret; 298e5b43573SFam Zheng } 299e5b43573SFam Zheng 300e5b43573SFam Zheng static void mirror_do_zero_or_discard(MirrorBlockJob *s, 301e5b43573SFam Zheng int64_t sector_num, 302e5b43573SFam Zheng int nb_sectors, 303e5b43573SFam Zheng bool is_discard) 304e5b43573SFam Zheng { 305e5b43573SFam Zheng MirrorOp *op; 306e5b43573SFam Zheng 307e5b43573SFam Zheng /* Allocate a MirrorOp that is used as an AIO callback. The qiov is zeroed 308e5b43573SFam Zheng * so the freeing in mirror_iteration_done is nop. */ 309e5b43573SFam Zheng op = g_new0(MirrorOp, 1); 310e5b43573SFam Zheng op->s = s; 311e5b43573SFam Zheng op->sector_num = sector_num; 312e5b43573SFam Zheng op->nb_sectors = nb_sectors; 313e5b43573SFam Zheng 314e5b43573SFam Zheng s->in_flight++; 315e5b43573SFam Zheng s->sectors_in_flight += nb_sectors; 316e5b43573SFam Zheng if (is_discard) { 3171c6c4bb7SEric Blake blk_aio_pdiscard(s->target, sector_num << BDRV_SECTOR_BITS, 3181c6c4bb7SEric Blake op->nb_sectors << BDRV_SECTOR_BITS, 319e5b43573SFam Zheng mirror_write_complete, op); 320e5b43573SFam Zheng } else { 321e253f4b8SKevin Wolf blk_aio_pwrite_zeroes(s->target, sector_num * BDRV_SECTOR_SIZE, 322e253f4b8SKevin Wolf op->nb_sectors * BDRV_SECTOR_SIZE, 323dcfb3bebSFam Zheng s->unmap ? BDRV_REQ_MAY_UNMAP : 0, 324dcfb3bebSFam Zheng mirror_write_complete, op); 325e5b43573SFam Zheng } 326e5b43573SFam Zheng } 327e5b43573SFam Zheng 328e5b43573SFam Zheng static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) 329e5b43573SFam Zheng { 330e253f4b8SKevin Wolf BlockDriverState *source = blk_bs(s->common.blk); 3319c83625bSMax Reitz int64_t sector_num, first_chunk; 332e5b43573SFam Zheng uint64_t delay_ns = 0; 333e5b43573SFam Zheng /* At least the first dirty chunk is mirrored in one iteration. */ 334e5b43573SFam Zheng int nb_chunks = 1; 335e5b43573SFam Zheng int64_t end = s->bdev_length / BDRV_SECTOR_SIZE; 336e5b43573SFam Zheng int sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 3374b5004d9SDenis V. Lunev bool write_zeroes_ok = bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)); 3380965a41eSVladimir Sementsov-Ogievskiy int max_io_sectors = MAX((s->buf_size >> BDRV_SECTOR_BITS) / MAX_IN_FLIGHT, 3390965a41eSVladimir Sementsov-Ogievskiy MAX_IO_SECTORS); 340e5b43573SFam Zheng 341dc162c8eSFam Zheng sector_num = bdrv_dirty_iter_next(s->dbi); 342e5b43573SFam Zheng if (sector_num < 0) { 343dc162c8eSFam Zheng bdrv_set_dirty_iter(s->dbi, 0); 344dc162c8eSFam Zheng sector_num = bdrv_dirty_iter_next(s->dbi); 345e5b43573SFam Zheng trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap)); 346e5b43573SFam Zheng assert(sector_num >= 0); 347e5b43573SFam Zheng } 348e5b43573SFam Zheng 3499c83625bSMax Reitz first_chunk = sector_num / sectors_per_chunk; 3509c83625bSMax Reitz while (test_bit(first_chunk, s->in_flight_bitmap)) { 351ff04198bSDenis V. Lunev trace_mirror_yield_in_flight(s, sector_num, s->in_flight); 3529c83625bSMax Reitz mirror_wait_for_io(s); 3539c83625bSMax Reitz } 3549c83625bSMax Reitz 355565ac01fSStefan Hajnoczi block_job_pause_point(&s->common); 356565ac01fSStefan Hajnoczi 357e5b43573SFam Zheng /* Find the number of consective dirty chunks following the first dirty 358e5b43573SFam Zheng * one, and wait for in flight requests in them. */ 359e5b43573SFam Zheng while (nb_chunks * sectors_per_chunk < (s->buf_size >> BDRV_SECTOR_BITS)) { 360dc162c8eSFam Zheng int64_t next_dirty; 361e5b43573SFam Zheng int64_t next_sector = sector_num + nb_chunks * sectors_per_chunk; 362e5b43573SFam Zheng int64_t next_chunk = next_sector / sectors_per_chunk; 363e5b43573SFam Zheng if (next_sector >= end || 364e5b43573SFam Zheng !bdrv_get_dirty(source, s->dirty_bitmap, next_sector)) { 365e5b43573SFam Zheng break; 366e5b43573SFam Zheng } 367e5b43573SFam Zheng if (test_bit(next_chunk, s->in_flight_bitmap)) { 368e5b43573SFam Zheng break; 369e5b43573SFam Zheng } 3709c83625bSMax Reitz 371dc162c8eSFam Zheng next_dirty = bdrv_dirty_iter_next(s->dbi); 372dc162c8eSFam Zheng if (next_dirty > next_sector || next_dirty < 0) { 373f27a2742SMax Reitz /* The bitmap iterator's cache is stale, refresh it */ 374dc162c8eSFam Zheng bdrv_set_dirty_iter(s->dbi, next_sector); 375dc162c8eSFam Zheng next_dirty = bdrv_dirty_iter_next(s->dbi); 376f27a2742SMax Reitz } 377dc162c8eSFam Zheng assert(next_dirty == next_sector); 378e5b43573SFam Zheng nb_chunks++; 379e5b43573SFam Zheng } 380e5b43573SFam Zheng 381e5b43573SFam Zheng /* Clear dirty bits before querying the block status, because 382e5b43573SFam Zheng * calling bdrv_get_block_status_above could yield - if some blocks are 383e5b43573SFam Zheng * marked dirty in this window, we need to know. 384e5b43573SFam Zheng */ 385e5b43573SFam Zheng bdrv_reset_dirty_bitmap(s->dirty_bitmap, sector_num, 386e5b43573SFam Zheng nb_chunks * sectors_per_chunk); 387e5b43573SFam Zheng bitmap_set(s->in_flight_bitmap, sector_num / sectors_per_chunk, nb_chunks); 388e5b43573SFam Zheng while (nb_chunks > 0 && sector_num < end) { 389e5b43573SFam Zheng int ret; 3904b5004d9SDenis V. Lunev int io_sectors, io_sectors_acct; 391e5b43573SFam Zheng BlockDriverState *file; 392e5b43573SFam Zheng enum MirrorMethod { 393e5b43573SFam Zheng MIRROR_METHOD_COPY, 394e5b43573SFam Zheng MIRROR_METHOD_ZERO, 395e5b43573SFam Zheng MIRROR_METHOD_DISCARD 396e5b43573SFam Zheng } mirror_method = MIRROR_METHOD_COPY; 397e5b43573SFam Zheng 398e5b43573SFam Zheng assert(!(sector_num % sectors_per_chunk)); 399e5b43573SFam Zheng ret = bdrv_get_block_status_above(source, NULL, sector_num, 400e5b43573SFam Zheng nb_chunks * sectors_per_chunk, 401e5b43573SFam Zheng &io_sectors, &file); 402e5b43573SFam Zheng if (ret < 0) { 4030965a41eSVladimir Sementsov-Ogievskiy io_sectors = MIN(nb_chunks * sectors_per_chunk, max_io_sectors); 4040965a41eSVladimir Sementsov-Ogievskiy } else if (ret & BDRV_BLOCK_DATA) { 4050965a41eSVladimir Sementsov-Ogievskiy io_sectors = MIN(io_sectors, max_io_sectors); 406e5b43573SFam Zheng } 407e5b43573SFam Zheng 408e5b43573SFam Zheng io_sectors -= io_sectors % sectors_per_chunk; 409e5b43573SFam Zheng if (io_sectors < sectors_per_chunk) { 410e5b43573SFam Zheng io_sectors = sectors_per_chunk; 411e5b43573SFam Zheng } else if (ret >= 0 && !(ret & BDRV_BLOCK_DATA)) { 412e5b43573SFam Zheng int64_t target_sector_num; 413e5b43573SFam Zheng int target_nb_sectors; 414244483e6SKevin Wolf bdrv_round_sectors_to_clusters(blk_bs(s->target), sector_num, 415244483e6SKevin Wolf io_sectors, &target_sector_num, 416244483e6SKevin Wolf &target_nb_sectors); 417e5b43573SFam Zheng if (target_sector_num == sector_num && 418e5b43573SFam Zheng target_nb_sectors == io_sectors) { 419e5b43573SFam Zheng mirror_method = ret & BDRV_BLOCK_ZERO ? 420e5b43573SFam Zheng MIRROR_METHOD_ZERO : 421e5b43573SFam Zheng MIRROR_METHOD_DISCARD; 422e5b43573SFam Zheng } 423e5b43573SFam Zheng } 424e5b43573SFam Zheng 425cf56a3c6SDenis V. Lunev while (s->in_flight >= MAX_IN_FLIGHT) { 426cf56a3c6SDenis V. Lunev trace_mirror_yield_in_flight(s, sector_num, s->in_flight); 427cf56a3c6SDenis V. Lunev mirror_wait_for_io(s); 428cf56a3c6SDenis V. Lunev } 429cf56a3c6SDenis V. Lunev 430dbaa7b57SVladimir Sementsov-Ogievskiy if (s->ret < 0) { 431dbaa7b57SVladimir Sementsov-Ogievskiy return 0; 432dbaa7b57SVladimir Sementsov-Ogievskiy } 433dbaa7b57SVladimir Sementsov-Ogievskiy 4344150ae60SFam Zheng mirror_clip_sectors(s, sector_num, &io_sectors); 435e5b43573SFam Zheng switch (mirror_method) { 436e5b43573SFam Zheng case MIRROR_METHOD_COPY: 437e5b43573SFam Zheng io_sectors = mirror_do_read(s, sector_num, io_sectors); 4384b5004d9SDenis V. Lunev io_sectors_acct = io_sectors; 439e5b43573SFam Zheng break; 440e5b43573SFam Zheng case MIRROR_METHOD_ZERO: 441e5b43573SFam Zheng case MIRROR_METHOD_DISCARD: 4424b5004d9SDenis V. Lunev mirror_do_zero_or_discard(s, sector_num, io_sectors, 4434b5004d9SDenis V. Lunev mirror_method == MIRROR_METHOD_DISCARD); 4444b5004d9SDenis V. Lunev if (write_zeroes_ok) { 4454b5004d9SDenis V. Lunev io_sectors_acct = 0; 4464b5004d9SDenis V. Lunev } else { 4474b5004d9SDenis V. Lunev io_sectors_acct = io_sectors; 4484b5004d9SDenis V. Lunev } 449e5b43573SFam Zheng break; 450e5b43573SFam Zheng default: 451e5b43573SFam Zheng abort(); 452e5b43573SFam Zheng } 453e5b43573SFam Zheng assert(io_sectors); 454e5b43573SFam Zheng sector_num += io_sectors; 4554150ae60SFam Zheng nb_chunks -= DIV_ROUND_UP(io_sectors, sectors_per_chunk); 456f14a39ccSSascha Silbe if (s->common.speed) { 4574b5004d9SDenis V. Lunev delay_ns = ratelimit_calculate_delay(&s->limit, io_sectors_acct); 458f14a39ccSSascha Silbe } 459dcfb3bebSFam Zheng } 460cc8c9d6cSPaolo Bonzini return delay_ns; 461893f7ebaSPaolo Bonzini } 462b952b558SPaolo Bonzini 463402a4741SPaolo Bonzini static void mirror_free_init(MirrorBlockJob *s) 464402a4741SPaolo Bonzini { 465402a4741SPaolo Bonzini int granularity = s->granularity; 466402a4741SPaolo Bonzini size_t buf_size = s->buf_size; 467402a4741SPaolo Bonzini uint8_t *buf = s->buf; 468402a4741SPaolo Bonzini 469402a4741SPaolo Bonzini assert(s->buf_free_count == 0); 470402a4741SPaolo Bonzini QSIMPLEQ_INIT(&s->buf_free); 471402a4741SPaolo Bonzini while (buf_size != 0) { 472402a4741SPaolo Bonzini MirrorBuffer *cur = (MirrorBuffer *)buf; 473402a4741SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&s->buf_free, cur, next); 474402a4741SPaolo Bonzini s->buf_free_count++; 475402a4741SPaolo Bonzini buf_size -= granularity; 476402a4741SPaolo Bonzini buf += granularity; 477402a4741SPaolo Bonzini } 478402a4741SPaolo Bonzini } 479402a4741SPaolo Bonzini 480bae8196dSPaolo Bonzini /* This is also used for the .pause callback. There is no matching 481bae8196dSPaolo Bonzini * mirror_resume() because mirror_run() will begin iterating again 482bae8196dSPaolo Bonzini * when the job is resumed. 483bae8196dSPaolo Bonzini */ 484bae8196dSPaolo Bonzini static void mirror_wait_for_all_io(MirrorBlockJob *s) 485bd48bde8SPaolo Bonzini { 486bd48bde8SPaolo Bonzini while (s->in_flight > 0) { 48721cd917fSFam Zheng mirror_wait_for_io(s); 488bd48bde8SPaolo Bonzini } 489893f7ebaSPaolo Bonzini } 490893f7ebaSPaolo Bonzini 4915a7e7a0bSStefan Hajnoczi typedef struct { 4925a7e7a0bSStefan Hajnoczi int ret; 4935a7e7a0bSStefan Hajnoczi } MirrorExitData; 4945a7e7a0bSStefan Hajnoczi 4955a7e7a0bSStefan Hajnoczi static void mirror_exit(BlockJob *job, void *opaque) 4965a7e7a0bSStefan Hajnoczi { 4975a7e7a0bSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 4985a7e7a0bSStefan Hajnoczi MirrorExitData *data = opaque; 4995a7e7a0bSStefan Hajnoczi AioContext *replace_aio_context = NULL; 500e253f4b8SKevin Wolf BlockDriverState *src = blk_bs(s->common.blk); 501e253f4b8SKevin Wolf BlockDriverState *target_bs = blk_bs(s->target); 5023f09bfbcSKevin Wolf 5033f09bfbcSKevin Wolf /* Make sure that the source BDS doesn't go away before we called 5043f09bfbcSKevin Wolf * block_job_completed(). */ 5053f09bfbcSKevin Wolf bdrv_ref(src); 5065a7e7a0bSStefan Hajnoczi 5075a7e7a0bSStefan Hajnoczi if (s->to_replace) { 5085a7e7a0bSStefan Hajnoczi replace_aio_context = bdrv_get_aio_context(s->to_replace); 5095a7e7a0bSStefan Hajnoczi aio_context_acquire(replace_aio_context); 5105a7e7a0bSStefan Hajnoczi } 5115a7e7a0bSStefan Hajnoczi 5125a7e7a0bSStefan Hajnoczi if (s->should_complete && data->ret == 0) { 513e253f4b8SKevin Wolf BlockDriverState *to_replace = src; 5145a7e7a0bSStefan Hajnoczi if (s->to_replace) { 5155a7e7a0bSStefan Hajnoczi to_replace = s->to_replace; 5165a7e7a0bSStefan Hajnoczi } 51740365552SKevin Wolf 518e253f4b8SKevin Wolf if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) { 519e253f4b8SKevin Wolf bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL); 5205a7e7a0bSStefan Hajnoczi } 521b8804815SKevin Wolf 522b8804815SKevin Wolf /* The mirror job has no requests in flight any more, but we need to 523b8804815SKevin Wolf * drain potential other users of the BDS before changing the graph. */ 524e253f4b8SKevin Wolf bdrv_drained_begin(target_bs); 525e253f4b8SKevin Wolf bdrv_replace_in_backing_chain(to_replace, target_bs); 526e253f4b8SKevin Wolf bdrv_drained_end(target_bs); 527b8804815SKevin Wolf 528b6d2e599SKevin Wolf /* We just changed the BDS the job BB refers to */ 529b6d2e599SKevin Wolf blk_remove_bs(job->blk); 530b6d2e599SKevin Wolf blk_insert_bs(job->blk, src); 5315a7e7a0bSStefan Hajnoczi } 5325a7e7a0bSStefan Hajnoczi if (s->to_replace) { 5335a7e7a0bSStefan Hajnoczi bdrv_op_unblock_all(s->to_replace, s->replace_blocker); 5345a7e7a0bSStefan Hajnoczi error_free(s->replace_blocker); 5355a7e7a0bSStefan Hajnoczi bdrv_unref(s->to_replace); 5365a7e7a0bSStefan Hajnoczi } 5375a7e7a0bSStefan Hajnoczi if (replace_aio_context) { 5385a7e7a0bSStefan Hajnoczi aio_context_release(replace_aio_context); 5395a7e7a0bSStefan Hajnoczi } 5405a7e7a0bSStefan Hajnoczi g_free(s->replaces); 541e253f4b8SKevin Wolf blk_unref(s->target); 542bae8196dSPaolo Bonzini s->target = NULL; 5435a7e7a0bSStefan Hajnoczi block_job_completed(&s->common, data->ret); 5445a7e7a0bSStefan Hajnoczi g_free(data); 545176c3699SFam Zheng bdrv_drained_end(src); 5463f09bfbcSKevin Wolf bdrv_unref(src); 5475a7e7a0bSStefan Hajnoczi } 5485a7e7a0bSStefan Hajnoczi 54949efb1f5SDenis V. Lunev static void mirror_throttle(MirrorBlockJob *s) 55049efb1f5SDenis V. Lunev { 55149efb1f5SDenis V. Lunev int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 55249efb1f5SDenis V. Lunev 55349efb1f5SDenis V. Lunev if (now - s->last_pause_ns > SLICE_TIME) { 55449efb1f5SDenis V. Lunev s->last_pause_ns = now; 55549efb1f5SDenis V. Lunev block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, 0); 55649efb1f5SDenis V. Lunev } else { 55749efb1f5SDenis V. Lunev block_job_pause_point(&s->common); 55849efb1f5SDenis V. Lunev } 55949efb1f5SDenis V. Lunev } 56049efb1f5SDenis V. Lunev 561c0b363adSDenis V. Lunev static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s) 562c0b363adSDenis V. Lunev { 563c0b363adSDenis V. Lunev int64_t sector_num, end; 564c0b363adSDenis V. Lunev BlockDriverState *base = s->base; 565c0b363adSDenis V. Lunev BlockDriverState *bs = blk_bs(s->common.blk); 566c0b363adSDenis V. Lunev BlockDriverState *target_bs = blk_bs(s->target); 567c0b363adSDenis V. Lunev int ret, n; 568c0b363adSDenis V. Lunev 569c0b363adSDenis V. Lunev end = s->bdev_length / BDRV_SECTOR_SIZE; 570c0b363adSDenis V. Lunev 571b7d5062cSDenis V. Lunev if (base == NULL && !bdrv_has_zero_init(target_bs)) { 572c7c2769cSDenis V. Lunev if (!bdrv_can_write_zeroes_with_unmap(target_bs)) { 573b7d5062cSDenis V. Lunev bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, end); 574b7d5062cSDenis V. Lunev return 0; 575b7d5062cSDenis V. Lunev } 576b7d5062cSDenis V. Lunev 57790ab48ebSAnton Nefedov s->initial_zeroing_ongoing = true; 578c7c2769cSDenis V. Lunev for (sector_num = 0; sector_num < end; ) { 579c7c2769cSDenis V. Lunev int nb_sectors = MIN(end - sector_num, 580c7c2769cSDenis V. Lunev QEMU_ALIGN_DOWN(INT_MAX, s->granularity) >> BDRV_SECTOR_BITS); 581c7c2769cSDenis V. Lunev 582c7c2769cSDenis V. Lunev mirror_throttle(s); 583c7c2769cSDenis V. Lunev 584c7c2769cSDenis V. Lunev if (block_job_is_cancelled(&s->common)) { 58590ab48ebSAnton Nefedov s->initial_zeroing_ongoing = false; 586c7c2769cSDenis V. Lunev return 0; 587c7c2769cSDenis V. Lunev } 588c7c2769cSDenis V. Lunev 589c7c2769cSDenis V. Lunev if (s->in_flight >= MAX_IN_FLIGHT) { 590c7c2769cSDenis V. Lunev trace_mirror_yield(s, s->in_flight, s->buf_free_count, -1); 591c7c2769cSDenis V. Lunev mirror_wait_for_io(s); 592c7c2769cSDenis V. Lunev continue; 593c7c2769cSDenis V. Lunev } 594c7c2769cSDenis V. Lunev 595c7c2769cSDenis V. Lunev mirror_do_zero_or_discard(s, sector_num, nb_sectors, false); 596c7c2769cSDenis V. Lunev sector_num += nb_sectors; 597c7c2769cSDenis V. Lunev } 598c7c2769cSDenis V. Lunev 599bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 60090ab48ebSAnton Nefedov s->initial_zeroing_ongoing = false; 601c7c2769cSDenis V. Lunev } 602c7c2769cSDenis V. Lunev 603c0b363adSDenis V. Lunev /* First part, loop on the sectors and initialize the dirty bitmap. */ 604c0b363adSDenis V. Lunev for (sector_num = 0; sector_num < end; ) { 605c0b363adSDenis V. Lunev /* Just to make sure we are not exceeding int limit. */ 606c0b363adSDenis V. Lunev int nb_sectors = MIN(INT_MAX >> BDRV_SECTOR_BITS, 607c0b363adSDenis V. Lunev end - sector_num); 608c0b363adSDenis V. Lunev 609c0b363adSDenis V. Lunev mirror_throttle(s); 610c0b363adSDenis V. Lunev 611c0b363adSDenis V. Lunev if (block_job_is_cancelled(&s->common)) { 612c0b363adSDenis V. Lunev return 0; 613c0b363adSDenis V. Lunev } 614c0b363adSDenis V. Lunev 615c0b363adSDenis V. Lunev ret = bdrv_is_allocated_above(bs, base, sector_num, nb_sectors, &n); 616c0b363adSDenis V. Lunev if (ret < 0) { 617c0b363adSDenis V. Lunev return ret; 618c0b363adSDenis V. Lunev } 619c0b363adSDenis V. Lunev 620c0b363adSDenis V. Lunev assert(n > 0); 621b7d5062cSDenis V. Lunev if (ret == 1) { 622c0b363adSDenis V. Lunev bdrv_set_dirty_bitmap(s->dirty_bitmap, sector_num, n); 623c0b363adSDenis V. Lunev } 624c0b363adSDenis V. Lunev sector_num += n; 625c0b363adSDenis V. Lunev } 626c0b363adSDenis V. Lunev return 0; 627c0b363adSDenis V. Lunev } 628c0b363adSDenis V. Lunev 629bdffb31dSPaolo Bonzini /* Called when going out of the streaming phase to flush the bulk of the 630bdffb31dSPaolo Bonzini * data to the medium, or just before completing. 631bdffb31dSPaolo Bonzini */ 632bdffb31dSPaolo Bonzini static int mirror_flush(MirrorBlockJob *s) 633bdffb31dSPaolo Bonzini { 634bdffb31dSPaolo Bonzini int ret = blk_flush(s->target); 635bdffb31dSPaolo Bonzini if (ret < 0) { 636bdffb31dSPaolo Bonzini if (mirror_error_action(s, false, -ret) == BLOCK_ERROR_ACTION_REPORT) { 637bdffb31dSPaolo Bonzini s->ret = ret; 638bdffb31dSPaolo Bonzini } 639bdffb31dSPaolo Bonzini } 640bdffb31dSPaolo Bonzini return ret; 641bdffb31dSPaolo Bonzini } 642bdffb31dSPaolo Bonzini 643893f7ebaSPaolo Bonzini static void coroutine_fn mirror_run(void *opaque) 644893f7ebaSPaolo Bonzini { 645893f7ebaSPaolo Bonzini MirrorBlockJob *s = opaque; 6465a7e7a0bSStefan Hajnoczi MirrorExitData *data; 647e253f4b8SKevin Wolf BlockDriverState *bs = blk_bs(s->common.blk); 648e253f4b8SKevin Wolf BlockDriverState *target_bs = blk_bs(s->target); 6499a0cec66SPaolo Bonzini bool need_drain = true; 650c0b363adSDenis V. Lunev int64_t length; 651b812f671SPaolo Bonzini BlockDriverInfo bdi; 6521d33936eSJeff Cody char backing_filename[2]; /* we only need 2 characters because we are only 6531d33936eSJeff Cody checking for a NULL string */ 654893f7ebaSPaolo Bonzini int ret = 0; 655e5b43573SFam Zheng int target_cluster_size = BDRV_SECTOR_SIZE; 656893f7ebaSPaolo Bonzini 657893f7ebaSPaolo Bonzini if (block_job_is_cancelled(&s->common)) { 658893f7ebaSPaolo Bonzini goto immediate_exit; 659893f7ebaSPaolo Bonzini } 660893f7ebaSPaolo Bonzini 661b21c7652SMax Reitz s->bdev_length = bdrv_getlength(bs); 662b21c7652SMax Reitz if (s->bdev_length < 0) { 663b21c7652SMax Reitz ret = s->bdev_length; 664373df5b1SFam Zheng goto immediate_exit; 665*becc347eSKevin Wolf } 666*becc347eSKevin Wolf 667*becc347eSKevin Wolf /* Active commit must resize the base image if its size differs from the 668*becc347eSKevin Wolf * active layer. */ 669*becc347eSKevin Wolf if (s->base == blk_bs(s->target)) { 670*becc347eSKevin Wolf int64_t base_length; 671*becc347eSKevin Wolf 672*becc347eSKevin Wolf base_length = blk_getlength(s->target); 673*becc347eSKevin Wolf if (base_length < 0) { 674*becc347eSKevin Wolf ret = base_length; 675*becc347eSKevin Wolf goto immediate_exit; 676*becc347eSKevin Wolf } 677*becc347eSKevin Wolf 678*becc347eSKevin Wolf if (s->bdev_length > base_length) { 679*becc347eSKevin Wolf ret = blk_truncate(s->target, s->bdev_length); 680*becc347eSKevin Wolf if (ret < 0) { 681*becc347eSKevin Wolf goto immediate_exit; 682*becc347eSKevin Wolf } 683*becc347eSKevin Wolf } 684*becc347eSKevin Wolf } 685*becc347eSKevin Wolf 686*becc347eSKevin Wolf if (s->bdev_length == 0) { 6879e48b025SFam Zheng /* Report BLOCK_JOB_READY and wait for complete. */ 6889e48b025SFam Zheng block_job_event_ready(&s->common); 6899e48b025SFam Zheng s->synced = true; 6909e48b025SFam Zheng while (!block_job_is_cancelled(&s->common) && !s->should_complete) { 6919e48b025SFam Zheng block_job_yield(&s->common); 6929e48b025SFam Zheng } 6939e48b025SFam Zheng s->common.cancelled = false; 6949e48b025SFam Zheng goto immediate_exit; 695893f7ebaSPaolo Bonzini } 696893f7ebaSPaolo Bonzini 697b21c7652SMax Reitz length = DIV_ROUND_UP(s->bdev_length, s->granularity); 698402a4741SPaolo Bonzini s->in_flight_bitmap = bitmap_new(length); 699402a4741SPaolo Bonzini 700b812f671SPaolo Bonzini /* If we have no backing file yet in the destination, we cannot let 701b812f671SPaolo Bonzini * the destination do COW. Instead, we copy sectors around the 702b812f671SPaolo Bonzini * dirty data if needed. We need a bitmap to do that. 703b812f671SPaolo Bonzini */ 704e253f4b8SKevin Wolf bdrv_get_backing_filename(target_bs, backing_filename, 705b812f671SPaolo Bonzini sizeof(backing_filename)); 706e253f4b8SKevin Wolf if (!bdrv_get_info(target_bs, &bdi) && bdi.cluster_size) { 707e5b43573SFam Zheng target_cluster_size = bdi.cluster_size; 708c3cc95bdSFam Zheng } 709e253f4b8SKevin Wolf if (backing_filename[0] && !target_bs->backing 710e5b43573SFam Zheng && s->granularity < target_cluster_size) { 711e5b43573SFam Zheng s->buf_size = MAX(s->buf_size, target_cluster_size); 712b812f671SPaolo Bonzini s->cow_bitmap = bitmap_new(length); 713b812f671SPaolo Bonzini } 714e5b43573SFam Zheng s->target_cluster_sectors = target_cluster_size >> BDRV_SECTOR_BITS; 715e253f4b8SKevin Wolf s->max_iov = MIN(bs->bl.max_iov, target_bs->bl.max_iov); 716b812f671SPaolo Bonzini 7177504edf4SKevin Wolf s->buf = qemu_try_blockalign(bs, s->buf_size); 7187504edf4SKevin Wolf if (s->buf == NULL) { 7197504edf4SKevin Wolf ret = -ENOMEM; 7207504edf4SKevin Wolf goto immediate_exit; 7217504edf4SKevin Wolf } 7227504edf4SKevin Wolf 723402a4741SPaolo Bonzini mirror_free_init(s); 724893f7ebaSPaolo Bonzini 72549efb1f5SDenis V. Lunev s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 72603544a6eSFam Zheng if (!s->is_none_mode) { 727c0b363adSDenis V. Lunev ret = mirror_dirty_init(s); 728c0b363adSDenis V. Lunev if (ret < 0 || block_job_is_cancelled(&s->common)) { 7294c0cbd6fSFam Zheng goto immediate_exit; 7304c0cbd6fSFam Zheng } 731893f7ebaSPaolo Bonzini } 732893f7ebaSPaolo Bonzini 733dc162c8eSFam Zheng assert(!s->dbi); 734dc162c8eSFam Zheng s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap, 0); 735893f7ebaSPaolo Bonzini for (;;) { 736cc8c9d6cSPaolo Bonzini uint64_t delay_ns = 0; 73749efb1f5SDenis V. Lunev int64_t cnt, delta; 738893f7ebaSPaolo Bonzini bool should_complete; 739893f7ebaSPaolo Bonzini 740bd48bde8SPaolo Bonzini if (s->ret < 0) { 741bd48bde8SPaolo Bonzini ret = s->ret; 742893f7ebaSPaolo Bonzini goto immediate_exit; 743893f7ebaSPaolo Bonzini } 744bd48bde8SPaolo Bonzini 745565ac01fSStefan Hajnoczi block_job_pause_point(&s->common); 746565ac01fSStefan Hajnoczi 74720dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 748b21c7652SMax Reitz /* s->common.offset contains the number of bytes already processed so 749b21c7652SMax Reitz * far, cnt is the number of dirty sectors remaining and 750b21c7652SMax Reitz * s->sectors_in_flight is the number of sectors currently being 751b21c7652SMax Reitz * processed; together those are the current total operation length */ 752b21c7652SMax Reitz s->common.len = s->common.offset + 753b21c7652SMax Reitz (cnt + s->sectors_in_flight) * BDRV_SECTOR_SIZE; 754bd48bde8SPaolo Bonzini 755bd48bde8SPaolo Bonzini /* Note that even when no rate limit is applied we need to yield 756a7282330SFam Zheng * periodically with no pending I/O so that bdrv_drain_all() returns. 757bd48bde8SPaolo Bonzini * We do so every SLICE_TIME nanoseconds, or when there is an error, 758bd48bde8SPaolo Bonzini * or when the source is clean, whichever comes first. 759bd48bde8SPaolo Bonzini */ 76049efb1f5SDenis V. Lunev delta = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->last_pause_ns; 76149efb1f5SDenis V. Lunev if (delta < SLICE_TIME && 762bd48bde8SPaolo Bonzini s->common.iostatus == BLOCK_DEVICE_IO_STATUS_OK) { 763cf56a3c6SDenis V. Lunev if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 || 764402a4741SPaolo Bonzini (cnt == 0 && s->in_flight > 0)) { 765402a4741SPaolo Bonzini trace_mirror_yield(s, s->in_flight, s->buf_free_count, cnt); 76621cd917fSFam Zheng mirror_wait_for_io(s); 767bd48bde8SPaolo Bonzini continue; 768bd48bde8SPaolo Bonzini } else if (cnt != 0) { 769cc8c9d6cSPaolo Bonzini delay_ns = mirror_iteration(s); 770893f7ebaSPaolo Bonzini } 771cc8c9d6cSPaolo Bonzini } 772893f7ebaSPaolo Bonzini 773893f7ebaSPaolo Bonzini should_complete = false; 774bd48bde8SPaolo Bonzini if (s->in_flight == 0 && cnt == 0) { 775893f7ebaSPaolo Bonzini trace_mirror_before_flush(s); 776bdffb31dSPaolo Bonzini if (!s->synced) { 777bdffb31dSPaolo Bonzini if (mirror_flush(s) < 0) { 778bdffb31dSPaolo Bonzini /* Go check s->ret. */ 779bdffb31dSPaolo Bonzini continue; 780893f7ebaSPaolo Bonzini } 781893f7ebaSPaolo Bonzini /* We're out of the streaming phase. From now on, if the job 782893f7ebaSPaolo Bonzini * is cancelled we will actually complete all pending I/O and 783893f7ebaSPaolo Bonzini * report completion. This way, block-job-cancel will leave 784893f7ebaSPaolo Bonzini * the target in a consistent state. 785893f7ebaSPaolo Bonzini */ 786bcada37bSWenchao Xia block_job_event_ready(&s->common); 787d63ffd87SPaolo Bonzini s->synced = true; 788d63ffd87SPaolo Bonzini } 789d63ffd87SPaolo Bonzini 790d63ffd87SPaolo Bonzini should_complete = s->should_complete || 791d63ffd87SPaolo Bonzini block_job_is_cancelled(&s->common); 79220dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 793893f7ebaSPaolo Bonzini } 794893f7ebaSPaolo Bonzini 795893f7ebaSPaolo Bonzini if (cnt == 0 && should_complete) { 796893f7ebaSPaolo Bonzini /* The dirty bitmap is not updated while operations are pending. 797893f7ebaSPaolo Bonzini * If we're about to exit, wait for pending operations before 798893f7ebaSPaolo Bonzini * calling bdrv_get_dirty_count(bs), or we may exit while the 799893f7ebaSPaolo Bonzini * source has dirty data to copy! 800893f7ebaSPaolo Bonzini * 801893f7ebaSPaolo Bonzini * Note that I/O can be submitted by the guest while 8029a0cec66SPaolo Bonzini * mirror_populate runs, so pause it now. Before deciding 8039a0cec66SPaolo Bonzini * whether to switch to target check one last time if I/O has 8049a0cec66SPaolo Bonzini * come in the meanwhile, and if not flush the data to disk. 805893f7ebaSPaolo Bonzini */ 806893f7ebaSPaolo Bonzini trace_mirror_before_drain(s, cnt); 8079a0cec66SPaolo Bonzini 8089a0cec66SPaolo Bonzini bdrv_drained_begin(bs); 80920dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 810bdffb31dSPaolo Bonzini if (cnt > 0 || mirror_flush(s) < 0) { 8119a0cec66SPaolo Bonzini bdrv_drained_end(bs); 8129a0cec66SPaolo Bonzini continue; 8139a0cec66SPaolo Bonzini } 8149a0cec66SPaolo Bonzini 8159a0cec66SPaolo Bonzini /* The two disks are in sync. Exit and report successful 8169a0cec66SPaolo Bonzini * completion. 8179a0cec66SPaolo Bonzini */ 8189a0cec66SPaolo Bonzini assert(QLIST_EMPTY(&bs->tracked_requests)); 8199a0cec66SPaolo Bonzini s->common.cancelled = false; 8209a0cec66SPaolo Bonzini need_drain = false; 8219a0cec66SPaolo Bonzini break; 822893f7ebaSPaolo Bonzini } 823893f7ebaSPaolo Bonzini 824893f7ebaSPaolo Bonzini ret = 0; 825cc8c9d6cSPaolo Bonzini trace_mirror_before_sleep(s, cnt, s->synced, delay_ns); 826d63ffd87SPaolo Bonzini if (!s->synced) { 8277483d1e5SAlex Bligh block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); 828893f7ebaSPaolo Bonzini if (block_job_is_cancelled(&s->common)) { 829893f7ebaSPaolo Bonzini break; 830893f7ebaSPaolo Bonzini } 831893f7ebaSPaolo Bonzini } else if (!should_complete) { 832bd48bde8SPaolo Bonzini delay_ns = (s->in_flight == 0 && cnt == 0 ? SLICE_TIME : 0); 8337483d1e5SAlex Bligh block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); 834893f7ebaSPaolo Bonzini } 83549efb1f5SDenis V. Lunev s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 836893f7ebaSPaolo Bonzini } 837893f7ebaSPaolo Bonzini 838893f7ebaSPaolo Bonzini immediate_exit: 839bd48bde8SPaolo Bonzini if (s->in_flight > 0) { 840bd48bde8SPaolo Bonzini /* We get here only if something went wrong. Either the job failed, 841bd48bde8SPaolo Bonzini * or it was cancelled prematurely so that we do not guarantee that 842bd48bde8SPaolo Bonzini * the target is a copy of the source. 843bd48bde8SPaolo Bonzini */ 844bd48bde8SPaolo Bonzini assert(ret < 0 || (!s->synced && block_job_is_cancelled(&s->common))); 8459a0cec66SPaolo Bonzini assert(need_drain); 846bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 847bd48bde8SPaolo Bonzini } 848bd48bde8SPaolo Bonzini 849bd48bde8SPaolo Bonzini assert(s->in_flight == 0); 8507191bf31SMarkus Armbruster qemu_vfree(s->buf); 851b812f671SPaolo Bonzini g_free(s->cow_bitmap); 852402a4741SPaolo Bonzini g_free(s->in_flight_bitmap); 853dc162c8eSFam Zheng bdrv_dirty_iter_free(s->dbi); 854e4654d2dSFam Zheng bdrv_release_dirty_bitmap(bs, s->dirty_bitmap); 8555a7e7a0bSStefan Hajnoczi 8565a7e7a0bSStefan Hajnoczi data = g_malloc(sizeof(*data)); 8575a7e7a0bSStefan Hajnoczi data->ret = ret; 8589a0cec66SPaolo Bonzini 8599a0cec66SPaolo Bonzini if (need_drain) { 860e253f4b8SKevin Wolf bdrv_drained_begin(bs); 8619a0cec66SPaolo Bonzini } 8625a7e7a0bSStefan Hajnoczi block_job_defer_to_main_loop(&s->common, mirror_exit, data); 863893f7ebaSPaolo Bonzini } 864893f7ebaSPaolo Bonzini 865893f7ebaSPaolo Bonzini static void mirror_set_speed(BlockJob *job, int64_t speed, Error **errp) 866893f7ebaSPaolo Bonzini { 867893f7ebaSPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 868893f7ebaSPaolo Bonzini 869893f7ebaSPaolo Bonzini if (speed < 0) { 870c6bd8c70SMarkus Armbruster error_setg(errp, QERR_INVALID_PARAMETER, "speed"); 871893f7ebaSPaolo Bonzini return; 872893f7ebaSPaolo Bonzini } 873893f7ebaSPaolo Bonzini ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME); 874893f7ebaSPaolo Bonzini } 875893f7ebaSPaolo Bonzini 876d63ffd87SPaolo Bonzini static void mirror_complete(BlockJob *job, Error **errp) 877d63ffd87SPaolo Bonzini { 878d63ffd87SPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 879274fcceeSMax Reitz BlockDriverState *src, *target; 880d63ffd87SPaolo Bonzini 881274fcceeSMax Reitz src = blk_bs(job->blk); 882274fcceeSMax Reitz target = blk_bs(s->target); 883274fcceeSMax Reitz 884d63ffd87SPaolo Bonzini if (!s->synced) { 8859df229c3SAlberto Garcia error_setg(errp, "The active block job '%s' cannot be completed", 8869df229c3SAlberto Garcia job->id); 887d63ffd87SPaolo Bonzini return; 888d63ffd87SPaolo Bonzini } 889d63ffd87SPaolo Bonzini 890274fcceeSMax Reitz if (s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) { 891274fcceeSMax Reitz int ret; 892274fcceeSMax Reitz 893274fcceeSMax Reitz assert(!target->backing); 894274fcceeSMax Reitz ret = bdrv_open_backing_file(target, NULL, "backing", errp); 895274fcceeSMax Reitz if (ret < 0) { 896274fcceeSMax Reitz return; 897274fcceeSMax Reitz } 898274fcceeSMax Reitz } 899274fcceeSMax Reitz 90015d67298SChanglong Xie /* block all operations on to_replace bs */ 90109158f00SBenoît Canet if (s->replaces) { 9025a7e7a0bSStefan Hajnoczi AioContext *replace_aio_context; 9035a7e7a0bSStefan Hajnoczi 904e12f3784SWen Congyang s->to_replace = bdrv_find_node(s->replaces); 90509158f00SBenoît Canet if (!s->to_replace) { 906e12f3784SWen Congyang error_setg(errp, "Node name '%s' not found", s->replaces); 90709158f00SBenoît Canet return; 90809158f00SBenoît Canet } 90909158f00SBenoît Canet 9105a7e7a0bSStefan Hajnoczi replace_aio_context = bdrv_get_aio_context(s->to_replace); 9115a7e7a0bSStefan Hajnoczi aio_context_acquire(replace_aio_context); 9125a7e7a0bSStefan Hajnoczi 91309158f00SBenoît Canet error_setg(&s->replace_blocker, 91409158f00SBenoît Canet "block device is in use by block-job-complete"); 91509158f00SBenoît Canet bdrv_op_block_all(s->to_replace, s->replace_blocker); 91609158f00SBenoît Canet bdrv_ref(s->to_replace); 9175a7e7a0bSStefan Hajnoczi 9185a7e7a0bSStefan Hajnoczi aio_context_release(replace_aio_context); 91909158f00SBenoît Canet } 92009158f00SBenoît Canet 921274fcceeSMax Reitz if (s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) { 922274fcceeSMax Reitz BlockDriverState *backing = s->is_none_mode ? src : s->base; 923274fcceeSMax Reitz if (backing_bs(target) != backing) { 924274fcceeSMax Reitz bdrv_set_backing_hd(target, backing); 925274fcceeSMax Reitz } 926274fcceeSMax Reitz } 927274fcceeSMax Reitz 928d63ffd87SPaolo Bonzini s->should_complete = true; 929751ebd76SFam Zheng block_job_enter(&s->common); 930d63ffd87SPaolo Bonzini } 931d63ffd87SPaolo Bonzini 932bae8196dSPaolo Bonzini static void mirror_pause(BlockJob *job) 933565ac01fSStefan Hajnoczi { 934565ac01fSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 935565ac01fSStefan Hajnoczi 936bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 937565ac01fSStefan Hajnoczi } 938565ac01fSStefan Hajnoczi 939565ac01fSStefan Hajnoczi static void mirror_attached_aio_context(BlockJob *job, AioContext *new_context) 940565ac01fSStefan Hajnoczi { 941565ac01fSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 942565ac01fSStefan Hajnoczi 943565ac01fSStefan Hajnoczi blk_set_aio_context(s->target, new_context); 944565ac01fSStefan Hajnoczi } 945565ac01fSStefan Hajnoczi 946bae8196dSPaolo Bonzini static void mirror_drain(BlockJob *job) 947bae8196dSPaolo Bonzini { 948bae8196dSPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 949bae8196dSPaolo Bonzini 950bae8196dSPaolo Bonzini /* Need to keep a reference in case blk_drain triggers execution 951bae8196dSPaolo Bonzini * of mirror_complete... 952bae8196dSPaolo Bonzini */ 953bae8196dSPaolo Bonzini if (s->target) { 954bae8196dSPaolo Bonzini BlockBackend *target = s->target; 955bae8196dSPaolo Bonzini blk_ref(target); 956bae8196dSPaolo Bonzini blk_drain(target); 957bae8196dSPaolo Bonzini blk_unref(target); 958bae8196dSPaolo Bonzini } 959bae8196dSPaolo Bonzini } 960bae8196dSPaolo Bonzini 9613fc4b10aSFam Zheng static const BlockJobDriver mirror_job_driver = { 962893f7ebaSPaolo Bonzini .instance_size = sizeof(MirrorBlockJob), 96379e14bf7SFam Zheng .job_type = BLOCK_JOB_TYPE_MIRROR, 964893f7ebaSPaolo Bonzini .set_speed = mirror_set_speed, 965a7815a76SJohn Snow .start = mirror_run, 966d63ffd87SPaolo Bonzini .complete = mirror_complete, 967565ac01fSStefan Hajnoczi .pause = mirror_pause, 968565ac01fSStefan Hajnoczi .attached_aio_context = mirror_attached_aio_context, 969bae8196dSPaolo Bonzini .drain = mirror_drain, 970893f7ebaSPaolo Bonzini }; 971893f7ebaSPaolo Bonzini 97203544a6eSFam Zheng static const BlockJobDriver commit_active_job_driver = { 97303544a6eSFam Zheng .instance_size = sizeof(MirrorBlockJob), 97403544a6eSFam Zheng .job_type = BLOCK_JOB_TYPE_COMMIT, 97503544a6eSFam Zheng .set_speed = mirror_set_speed, 976a7815a76SJohn Snow .start = mirror_run, 97703544a6eSFam Zheng .complete = mirror_complete, 978565ac01fSStefan Hajnoczi .pause = mirror_pause, 979565ac01fSStefan Hajnoczi .attached_aio_context = mirror_attached_aio_context, 980bae8196dSPaolo Bonzini .drain = mirror_drain, 98103544a6eSFam Zheng }; 98203544a6eSFam Zheng 98371aa9867SAlberto Garcia static void mirror_start_job(const char *job_id, BlockDriverState *bs, 98447970dfbSJohn Snow int creation_flags, BlockDriverState *target, 98547970dfbSJohn Snow const char *replaces, int64_t speed, 98647970dfbSJohn Snow uint32_t granularity, int64_t buf_size, 987274fcceeSMax Reitz BlockMirrorBackingMode backing_mode, 98803544a6eSFam Zheng BlockdevOnError on_source_error, 989b952b558SPaolo Bonzini BlockdevOnError on_target_error, 9900fc9f8eaSFam Zheng bool unmap, 991097310b5SMarkus Armbruster BlockCompletionFunc *cb, 99203544a6eSFam Zheng void *opaque, Error **errp, 99303544a6eSFam Zheng const BlockJobDriver *driver, 994b49f7eadSWen Congyang bool is_none_mode, BlockDriverState *base, 995b49f7eadSWen Congyang bool auto_complete) 996893f7ebaSPaolo Bonzini { 997893f7ebaSPaolo Bonzini MirrorBlockJob *s; 998893f7ebaSPaolo Bonzini 999eee13dfeSPaolo Bonzini if (granularity == 0) { 1000341ebc2fSJohn Snow granularity = bdrv_get_default_bitmap_granularity(target); 1001eee13dfeSPaolo Bonzini } 1002eee13dfeSPaolo Bonzini 1003eee13dfeSPaolo Bonzini assert ((granularity & (granularity - 1)) == 0); 1004eee13dfeSPaolo Bonzini 100548ac0a4dSWen Congyang if (buf_size < 0) { 100648ac0a4dSWen Congyang error_setg(errp, "Invalid parameter 'buf-size'"); 100748ac0a4dSWen Congyang return; 100848ac0a4dSWen Congyang } 100948ac0a4dSWen Congyang 101048ac0a4dSWen Congyang if (buf_size == 0) { 101148ac0a4dSWen Congyang buf_size = DEFAULT_MIRROR_BUF_SIZE; 101248ac0a4dSWen Congyang } 10135bc361b8SFam Zheng 101447970dfbSJohn Snow s = block_job_create(job_id, driver, bs, speed, creation_flags, 101547970dfbSJohn Snow cb, opaque, errp); 1016893f7ebaSPaolo Bonzini if (!s) { 1017893f7ebaSPaolo Bonzini return; 1018893f7ebaSPaolo Bonzini } 1019893f7ebaSPaolo Bonzini 1020e253f4b8SKevin Wolf s->target = blk_new(); 1021e253f4b8SKevin Wolf blk_insert_bs(s->target, target); 1022e253f4b8SKevin Wolf 102309158f00SBenoît Canet s->replaces = g_strdup(replaces); 1024b952b558SPaolo Bonzini s->on_source_error = on_source_error; 1025b952b558SPaolo Bonzini s->on_target_error = on_target_error; 102603544a6eSFam Zheng s->is_none_mode = is_none_mode; 1027274fcceeSMax Reitz s->backing_mode = backing_mode; 10285bc361b8SFam Zheng s->base = base; 1029eee13dfeSPaolo Bonzini s->granularity = granularity; 103048ac0a4dSWen Congyang s->buf_size = ROUND_UP(buf_size, granularity); 10310fc9f8eaSFam Zheng s->unmap = unmap; 1032b49f7eadSWen Congyang if (auto_complete) { 1033b49f7eadSWen Congyang s->should_complete = true; 1034b49f7eadSWen Congyang } 1035b812f671SPaolo Bonzini 10360db6e54aSFam Zheng s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); 1037b8afb520SFam Zheng if (!s->dirty_bitmap) { 103897031164STing Wang g_free(s->replaces); 1039e253f4b8SKevin Wolf blk_unref(s->target); 104018930ba3SFam Zheng block_job_unref(&s->common); 1041b8afb520SFam Zheng return; 1042b8afb520SFam Zheng } 104310f3cd15SAlberto Garcia 1044cee3c6b5SAlberto Garcia block_job_add_bdrv(&s->common, target); 1045f3ede4b0SAlberto Garcia /* In commit_active_start() all intermediate nodes disappear, so 1046f3ede4b0SAlberto Garcia * any jobs in them must be blocked */ 1047f3ede4b0SAlberto Garcia if (bdrv_chain_contains(bs, target)) { 1048f3ede4b0SAlberto Garcia BlockDriverState *iter; 1049f3ede4b0SAlberto Garcia for (iter = backing_bs(bs); iter != target; iter = backing_bs(iter)) { 1050f3ede4b0SAlberto Garcia block_job_add_bdrv(&s->common, iter); 1051f3ede4b0SAlberto Garcia } 1052f3ede4b0SAlberto Garcia } 105310f3cd15SAlberto Garcia 10545ccac6f1SJohn Snow trace_mirror_start(bs, s, opaque); 10555ccac6f1SJohn Snow block_job_start(&s->common); 1056893f7ebaSPaolo Bonzini } 105703544a6eSFam Zheng 105871aa9867SAlberto Garcia void mirror_start(const char *job_id, BlockDriverState *bs, 105971aa9867SAlberto Garcia BlockDriverState *target, const char *replaces, 10605fba6c0eSJohn Snow int64_t speed, uint32_t granularity, int64_t buf_size, 1061274fcceeSMax Reitz MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, 1062274fcceeSMax Reitz BlockdevOnError on_source_error, 106303544a6eSFam Zheng BlockdevOnError on_target_error, 10648254b6d9SJohn Snow bool unmap, Error **errp) 106503544a6eSFam Zheng { 106603544a6eSFam Zheng bool is_none_mode; 106703544a6eSFam Zheng BlockDriverState *base; 106803544a6eSFam Zheng 10694b80ab2bSJohn Snow if (mode == MIRROR_SYNC_MODE_INCREMENTAL) { 10704b80ab2bSJohn Snow error_setg(errp, "Sync mode 'incremental' not supported"); 1071d58d8453SJohn Snow return; 1072d58d8453SJohn Snow } 107303544a6eSFam Zheng is_none_mode = mode == MIRROR_SYNC_MODE_NONE; 1074760e0063SKevin Wolf base = mode == MIRROR_SYNC_MODE_TOP ? backing_bs(bs) : NULL; 107547970dfbSJohn Snow mirror_start_job(job_id, bs, BLOCK_JOB_DEFAULT, target, replaces, 1076274fcceeSMax Reitz speed, granularity, buf_size, backing_mode, 10778254b6d9SJohn Snow on_source_error, on_target_error, unmap, NULL, NULL, errp, 1078b49f7eadSWen Congyang &mirror_job_driver, is_none_mode, base, false); 107903544a6eSFam Zheng } 108003544a6eSFam Zheng 1081fd62c609SAlberto Garcia void commit_active_start(const char *job_id, BlockDriverState *bs, 108247970dfbSJohn Snow BlockDriverState *base, int creation_flags, 108347970dfbSJohn Snow int64_t speed, BlockdevOnError on_error, 108447970dfbSJohn Snow BlockCompletionFunc *cb, void *opaque, Error **errp, 1085b49f7eadSWen Congyang bool auto_complete) 108603544a6eSFam Zheng { 10874da83585SJeff Cody int orig_base_flags; 1088cc67f4d1SJeff Cody Error *local_err = NULL; 10894da83585SJeff Cody 10904da83585SJeff Cody orig_base_flags = bdrv_get_flags(base); 10914da83585SJeff Cody 109220a63d2cSFam Zheng if (bdrv_reopen(base, bs->open_flags, errp)) { 109320a63d2cSFam Zheng return; 109420a63d2cSFam Zheng } 10954da83585SJeff Cody 109647970dfbSJohn Snow mirror_start_job(job_id, bs, creation_flags, base, NULL, speed, 0, 0, 109771aa9867SAlberto Garcia MIRROR_LEAVE_BACKING_CHAIN, 10986f13acf9SFam Zheng on_error, on_error, true, cb, opaque, &local_err, 1099b49f7eadSWen Congyang &commit_active_job_driver, false, base, auto_complete); 11000fb6395cSMarkus Armbruster if (local_err) { 1101cc67f4d1SJeff Cody error_propagate(errp, local_err); 11024da83585SJeff Cody goto error_restore_flags; 11034da83585SJeff Cody } 11044da83585SJeff Cody 11054da83585SJeff Cody return; 11064da83585SJeff Cody 11074da83585SJeff Cody error_restore_flags: 11084da83585SJeff Cody /* ignore error and errp for bdrv_reopen, because we want to propagate 11094da83585SJeff Cody * the original error */ 11104da83585SJeff Cody bdrv_reopen(base, orig_base_flags, NULL); 11114da83585SJeff Cody return; 111203544a6eSFam Zheng } 1113