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" 16737e150eSPaolo Bonzini #include "block/blockjob.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 2648ac0a4dSWen Congyang #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) 27402a4741SPaolo Bonzini 28402a4741SPaolo Bonzini /* The mirroring buffer is a list of granularity-sized chunks. 29402a4741SPaolo Bonzini * Free chunks are organized in a list. 30402a4741SPaolo Bonzini */ 31402a4741SPaolo Bonzini typedef struct MirrorBuffer { 32402a4741SPaolo Bonzini QSIMPLEQ_ENTRY(MirrorBuffer) next; 33402a4741SPaolo Bonzini } MirrorBuffer; 34893f7ebaSPaolo Bonzini 35893f7ebaSPaolo Bonzini typedef struct MirrorBlockJob { 36893f7ebaSPaolo Bonzini BlockJob common; 37893f7ebaSPaolo Bonzini RateLimit limit; 38e253f4b8SKevin Wolf BlockBackend *target; 395bc361b8SFam Zheng BlockDriverState *base; 4009158f00SBenoît Canet /* The name of the graph node to replace */ 4109158f00SBenoît Canet char *replaces; 4209158f00SBenoît Canet /* The BDS to replace */ 4309158f00SBenoît Canet BlockDriverState *to_replace; 4409158f00SBenoît Canet /* Used to block operations on the drive-mirror-replace target */ 4509158f00SBenoît Canet Error *replace_blocker; 4603544a6eSFam Zheng bool is_none_mode; 47274fcceeSMax Reitz BlockMirrorBackingMode backing_mode; 48b952b558SPaolo Bonzini BlockdevOnError on_source_error, on_target_error; 49d63ffd87SPaolo Bonzini bool synced; 50d63ffd87SPaolo Bonzini bool should_complete; 51eee13dfeSPaolo Bonzini int64_t granularity; 52b812f671SPaolo Bonzini size_t buf_size; 53b21c7652SMax Reitz int64_t bdev_length; 54b812f671SPaolo Bonzini unsigned long *cow_bitmap; 55e4654d2dSFam Zheng BdrvDirtyBitmap *dirty_bitmap; 568f0720ecSPaolo Bonzini HBitmapIter hbi; 57893f7ebaSPaolo Bonzini uint8_t *buf; 58402a4741SPaolo Bonzini QSIMPLEQ_HEAD(, MirrorBuffer) buf_free; 59402a4741SPaolo Bonzini int buf_free_count; 60bd48bde8SPaolo Bonzini 6149efb1f5SDenis V. Lunev uint64_t last_pause_ns; 62402a4741SPaolo Bonzini unsigned long *in_flight_bitmap; 63bd48bde8SPaolo Bonzini int in_flight; 64531509baSDenis V. Lunev int64_t sectors_in_flight; 65bd48bde8SPaolo Bonzini int ret; 660fc9f8eaSFam Zheng bool unmap; 67e424aff5SKevin Wolf bool waiting_for_io; 68e5b43573SFam Zheng int target_cluster_sectors; 69e5b43573SFam Zheng int max_iov; 70893f7ebaSPaolo Bonzini } MirrorBlockJob; 71893f7ebaSPaolo Bonzini 72bd48bde8SPaolo Bonzini typedef struct MirrorOp { 73bd48bde8SPaolo Bonzini MirrorBlockJob *s; 74bd48bde8SPaolo Bonzini QEMUIOVector qiov; 75bd48bde8SPaolo Bonzini int64_t sector_num; 76bd48bde8SPaolo Bonzini int nb_sectors; 77bd48bde8SPaolo Bonzini } MirrorOp; 78bd48bde8SPaolo Bonzini 79b952b558SPaolo Bonzini static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read, 80b952b558SPaolo Bonzini int error) 81b952b558SPaolo Bonzini { 82b952b558SPaolo Bonzini s->synced = false; 83b952b558SPaolo Bonzini if (read) { 8481e254dcSKevin Wolf return block_job_error_action(&s->common, s->on_source_error, 8581e254dcSKevin Wolf true, error); 86b952b558SPaolo Bonzini } else { 8781e254dcSKevin Wolf return block_job_error_action(&s->common, s->on_target_error, 8881e254dcSKevin Wolf false, error); 89b952b558SPaolo Bonzini } 90b952b558SPaolo Bonzini } 91b952b558SPaolo Bonzini 92bd48bde8SPaolo Bonzini static void mirror_iteration_done(MirrorOp *op, int ret) 93bd48bde8SPaolo Bonzini { 94bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 95402a4741SPaolo Bonzini struct iovec *iov; 96bd48bde8SPaolo Bonzini int64_t chunk_num; 97402a4741SPaolo Bonzini int i, nb_chunks, sectors_per_chunk; 98bd48bde8SPaolo Bonzini 99bd48bde8SPaolo Bonzini trace_mirror_iteration_done(s, op->sector_num, op->nb_sectors, ret); 100bd48bde8SPaolo Bonzini 101bd48bde8SPaolo Bonzini s->in_flight--; 102b21c7652SMax Reitz s->sectors_in_flight -= op->nb_sectors; 103402a4741SPaolo Bonzini iov = op->qiov.iov; 104402a4741SPaolo Bonzini for (i = 0; i < op->qiov.niov; i++) { 105402a4741SPaolo Bonzini MirrorBuffer *buf = (MirrorBuffer *) iov[i].iov_base; 106402a4741SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&s->buf_free, buf, next); 107402a4741SPaolo Bonzini s->buf_free_count++; 108402a4741SPaolo Bonzini } 109402a4741SPaolo Bonzini 110bd48bde8SPaolo Bonzini sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 111bd48bde8SPaolo Bonzini chunk_num = op->sector_num / sectors_per_chunk; 1124150ae60SFam Zheng nb_chunks = DIV_ROUND_UP(op->nb_sectors, sectors_per_chunk); 113402a4741SPaolo Bonzini bitmap_clear(s->in_flight_bitmap, chunk_num, nb_chunks); 114b21c7652SMax Reitz if (ret >= 0) { 115b21c7652SMax Reitz if (s->cow_bitmap) { 116bd48bde8SPaolo Bonzini bitmap_set(s->cow_bitmap, chunk_num, nb_chunks); 117bd48bde8SPaolo Bonzini } 118b21c7652SMax Reitz s->common.offset += (uint64_t)op->nb_sectors * BDRV_SECTOR_SIZE; 119b21c7652SMax Reitz } 120bd48bde8SPaolo Bonzini 1216df3bf8eSZhang Min qemu_iovec_destroy(&op->qiov); 122c84b3192SPaolo Bonzini g_free(op); 1237b770c72SStefan Hajnoczi 124e424aff5SKevin Wolf if (s->waiting_for_io) { 1250b8b8753SPaolo Bonzini qemu_coroutine_enter(s->common.co); 126bd48bde8SPaolo Bonzini } 1277b770c72SStefan Hajnoczi } 128bd48bde8SPaolo Bonzini 129bd48bde8SPaolo Bonzini static void mirror_write_complete(void *opaque, int ret) 130bd48bde8SPaolo Bonzini { 131bd48bde8SPaolo Bonzini MirrorOp *op = opaque; 132bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 133bd48bde8SPaolo Bonzini if (ret < 0) { 134bd48bde8SPaolo Bonzini BlockErrorAction action; 135bd48bde8SPaolo Bonzini 13620dca810SJohn Snow bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors); 137bd48bde8SPaolo Bonzini action = mirror_error_action(s, false, -ret); 138a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { 139bd48bde8SPaolo Bonzini s->ret = ret; 140bd48bde8SPaolo Bonzini } 141bd48bde8SPaolo Bonzini } 142bd48bde8SPaolo Bonzini mirror_iteration_done(op, ret); 143bd48bde8SPaolo Bonzini } 144bd48bde8SPaolo Bonzini 145bd48bde8SPaolo Bonzini static void mirror_read_complete(void *opaque, int ret) 146bd48bde8SPaolo Bonzini { 147bd48bde8SPaolo Bonzini MirrorOp *op = opaque; 148bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 149bd48bde8SPaolo Bonzini if (ret < 0) { 150bd48bde8SPaolo Bonzini BlockErrorAction action; 151bd48bde8SPaolo Bonzini 15220dca810SJohn Snow bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors); 153bd48bde8SPaolo Bonzini action = mirror_error_action(s, true, -ret); 154a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { 155bd48bde8SPaolo Bonzini s->ret = ret; 156bd48bde8SPaolo Bonzini } 157bd48bde8SPaolo Bonzini 158bd48bde8SPaolo Bonzini mirror_iteration_done(op, ret); 159bd48bde8SPaolo Bonzini return; 160bd48bde8SPaolo Bonzini } 161e253f4b8SKevin Wolf blk_aio_pwritev(s->target, op->sector_num * BDRV_SECTOR_SIZE, &op->qiov, 16273698c30SEric Blake 0, mirror_write_complete, op); 163bd48bde8SPaolo Bonzini } 164bd48bde8SPaolo Bonzini 1654150ae60SFam Zheng static inline void mirror_clip_sectors(MirrorBlockJob *s, 1664150ae60SFam Zheng int64_t sector_num, 1674150ae60SFam Zheng int *nb_sectors) 1684150ae60SFam Zheng { 1694150ae60SFam Zheng *nb_sectors = MIN(*nb_sectors, 1704150ae60SFam Zheng s->bdev_length / BDRV_SECTOR_SIZE - sector_num); 1714150ae60SFam Zheng } 1724150ae60SFam Zheng 173e5b43573SFam Zheng /* Round sector_num and/or nb_sectors to target cluster if COW is needed, and 174e5b43573SFam Zheng * return the offset of the adjusted tail sector against original. */ 175e5b43573SFam Zheng static int mirror_cow_align(MirrorBlockJob *s, 176e5b43573SFam Zheng int64_t *sector_num, 177e5b43573SFam Zheng int *nb_sectors) 178893f7ebaSPaolo Bonzini { 179e5b43573SFam Zheng bool need_cow; 180e5b43573SFam Zheng int ret = 0; 181e5b43573SFam Zheng int chunk_sectors = s->granularity >> BDRV_SECTOR_BITS; 182e5b43573SFam Zheng int64_t align_sector_num = *sector_num; 183e5b43573SFam Zheng int align_nb_sectors = *nb_sectors; 184e5b43573SFam Zheng int max_sectors = chunk_sectors * s->max_iov; 185893f7ebaSPaolo Bonzini 186e5b43573SFam Zheng need_cow = !test_bit(*sector_num / chunk_sectors, s->cow_bitmap); 187e5b43573SFam Zheng need_cow |= !test_bit((*sector_num + *nb_sectors - 1) / chunk_sectors, 188e5b43573SFam Zheng s->cow_bitmap); 189e5b43573SFam Zheng if (need_cow) { 190244483e6SKevin Wolf bdrv_round_sectors_to_clusters(blk_bs(s->target), *sector_num, 191244483e6SKevin Wolf *nb_sectors, &align_sector_num, 192244483e6SKevin Wolf &align_nb_sectors); 1938f0720ecSPaolo Bonzini } 1948f0720ecSPaolo Bonzini 195e5b43573SFam Zheng if (align_nb_sectors > max_sectors) { 196e5b43573SFam Zheng align_nb_sectors = max_sectors; 197e5b43573SFam Zheng if (need_cow) { 198e5b43573SFam Zheng align_nb_sectors = QEMU_ALIGN_DOWN(align_nb_sectors, 199e5b43573SFam Zheng s->target_cluster_sectors); 200e5b43573SFam Zheng } 201e5b43573SFam Zheng } 2024150ae60SFam Zheng /* Clipping may result in align_nb_sectors unaligned to chunk boundary, but 2034150ae60SFam Zheng * that doesn't matter because it's already the end of source image. */ 2044150ae60SFam Zheng mirror_clip_sectors(s, align_sector_num, &align_nb_sectors); 205402a4741SPaolo Bonzini 206e5b43573SFam Zheng ret = align_sector_num + align_nb_sectors - (*sector_num + *nb_sectors); 207e5b43573SFam Zheng *sector_num = align_sector_num; 208e5b43573SFam Zheng *nb_sectors = align_nb_sectors; 209e5b43573SFam Zheng assert(ret >= 0); 210e5b43573SFam Zheng return ret; 211e5b43573SFam Zheng } 212e5b43573SFam Zheng 21321cd917fSFam Zheng static inline void mirror_wait_for_io(MirrorBlockJob *s) 21421cd917fSFam Zheng { 21521cd917fSFam Zheng assert(!s->waiting_for_io); 21621cd917fSFam Zheng s->waiting_for_io = true; 21721cd917fSFam Zheng qemu_coroutine_yield(); 21821cd917fSFam Zheng s->waiting_for_io = false; 21921cd917fSFam Zheng } 22021cd917fSFam Zheng 221e5b43573SFam Zheng /* Submit async read while handling COW. 22217612955SJohn Snow * Returns: The number of sectors copied after and including sector_num, 22317612955SJohn Snow * excluding any sectors copied prior to sector_num due to alignment. 22417612955SJohn Snow * This will be nb_sectors if no alignment is necessary, or 225e5b43573SFam Zheng * (new_end - sector_num) if tail is rounded up or down due to 226e5b43573SFam Zheng * alignment or buffer limit. 227402a4741SPaolo Bonzini */ 228e5b43573SFam Zheng static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num, 229e5b43573SFam Zheng int nb_sectors) 230e5b43573SFam Zheng { 231e253f4b8SKevin Wolf BlockBackend *source = s->common.blk; 232e5b43573SFam Zheng int sectors_per_chunk, nb_chunks; 23317612955SJohn Snow int ret; 234e5b43573SFam Zheng MirrorOp *op; 235e4808881SJohn Snow int max_sectors; 236402a4741SPaolo Bonzini 237e5b43573SFam Zheng sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 238e4808881SJohn Snow max_sectors = sectors_per_chunk * s->max_iov; 239e5b43573SFam Zheng 240e5b43573SFam Zheng /* We can only handle as much as buf_size at a time. */ 241e5b43573SFam Zheng nb_sectors = MIN(s->buf_size >> BDRV_SECTOR_BITS, nb_sectors); 242e4808881SJohn Snow nb_sectors = MIN(max_sectors, nb_sectors); 243e5b43573SFam Zheng assert(nb_sectors); 24417612955SJohn Snow ret = nb_sectors; 245e5b43573SFam Zheng 246e5b43573SFam Zheng if (s->cow_bitmap) { 247e5b43573SFam Zheng ret += mirror_cow_align(s, §or_num, &nb_sectors); 248e5b43573SFam Zheng } 249e5b43573SFam Zheng assert(nb_sectors << BDRV_SECTOR_BITS <= s->buf_size); 250e5b43573SFam Zheng /* The sector range must meet granularity because: 251e5b43573SFam Zheng * 1) Caller passes in aligned values; 252e5b43573SFam Zheng * 2) mirror_cow_align is used only when target cluster is larger. */ 253e5b43573SFam Zheng assert(!(sector_num % sectors_per_chunk)); 2544150ae60SFam Zheng nb_chunks = DIV_ROUND_UP(nb_sectors, sectors_per_chunk); 255e5b43573SFam Zheng 256e5b43573SFam Zheng while (s->buf_free_count < nb_chunks) { 257402a4741SPaolo Bonzini trace_mirror_yield_in_flight(s, sector_num, s->in_flight); 25821cd917fSFam Zheng mirror_wait_for_io(s); 259b812f671SPaolo Bonzini } 260b812f671SPaolo Bonzini 261bd48bde8SPaolo Bonzini /* Allocate a MirrorOp that is used as an AIO callback. */ 262c84b3192SPaolo Bonzini op = g_new(MirrorOp, 1); 263bd48bde8SPaolo Bonzini op->s = s; 264bd48bde8SPaolo Bonzini op->sector_num = sector_num; 265bd48bde8SPaolo Bonzini op->nb_sectors = nb_sectors; 266402a4741SPaolo Bonzini 267402a4741SPaolo Bonzini /* Now make a QEMUIOVector taking enough granularity-sized chunks 268402a4741SPaolo Bonzini * from s->buf_free. 269402a4741SPaolo Bonzini */ 270402a4741SPaolo Bonzini qemu_iovec_init(&op->qiov, nb_chunks); 271402a4741SPaolo Bonzini while (nb_chunks-- > 0) { 272402a4741SPaolo Bonzini MirrorBuffer *buf = QSIMPLEQ_FIRST(&s->buf_free); 273e5b43573SFam Zheng size_t remaining = nb_sectors * BDRV_SECTOR_SIZE - op->qiov.size; 2745a0f6fd5SKevin Wolf 275402a4741SPaolo Bonzini QSIMPLEQ_REMOVE_HEAD(&s->buf_free, next); 276402a4741SPaolo Bonzini s->buf_free_count--; 2775a0f6fd5SKevin Wolf qemu_iovec_add(&op->qiov, buf, MIN(s->granularity, remaining)); 278402a4741SPaolo Bonzini } 279402a4741SPaolo Bonzini 280893f7ebaSPaolo Bonzini /* Copy the dirty cluster. */ 281bd48bde8SPaolo Bonzini s->in_flight++; 282b21c7652SMax Reitz s->sectors_in_flight += nb_sectors; 283b812f671SPaolo Bonzini trace_mirror_one_iteration(s, sector_num, nb_sectors); 284dcfb3bebSFam Zheng 28573698c30SEric Blake blk_aio_preadv(source, sector_num * BDRV_SECTOR_SIZE, &op->qiov, 0, 286bd48bde8SPaolo Bonzini mirror_read_complete, op); 287e5b43573SFam Zheng return ret; 288e5b43573SFam Zheng } 289e5b43573SFam Zheng 290e5b43573SFam Zheng static void mirror_do_zero_or_discard(MirrorBlockJob *s, 291e5b43573SFam Zheng int64_t sector_num, 292e5b43573SFam Zheng int nb_sectors, 293e5b43573SFam Zheng bool is_discard) 294e5b43573SFam Zheng { 295e5b43573SFam Zheng MirrorOp *op; 296e5b43573SFam Zheng 297e5b43573SFam Zheng /* Allocate a MirrorOp that is used as an AIO callback. The qiov is zeroed 298e5b43573SFam Zheng * so the freeing in mirror_iteration_done is nop. */ 299e5b43573SFam Zheng op = g_new0(MirrorOp, 1); 300e5b43573SFam Zheng op->s = s; 301e5b43573SFam Zheng op->sector_num = sector_num; 302e5b43573SFam Zheng op->nb_sectors = nb_sectors; 303e5b43573SFam Zheng 304e5b43573SFam Zheng s->in_flight++; 305e5b43573SFam Zheng s->sectors_in_flight += nb_sectors; 306e5b43573SFam Zheng if (is_discard) { 307e253f4b8SKevin Wolf blk_aio_discard(s->target, sector_num, op->nb_sectors, 308e5b43573SFam Zheng mirror_write_complete, op); 309e5b43573SFam Zheng } else { 310e253f4b8SKevin Wolf blk_aio_pwrite_zeroes(s->target, sector_num * BDRV_SECTOR_SIZE, 311e253f4b8SKevin Wolf op->nb_sectors * BDRV_SECTOR_SIZE, 312dcfb3bebSFam Zheng s->unmap ? BDRV_REQ_MAY_UNMAP : 0, 313dcfb3bebSFam Zheng mirror_write_complete, op); 314e5b43573SFam Zheng } 315e5b43573SFam Zheng } 316e5b43573SFam Zheng 317e5b43573SFam Zheng static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) 318e5b43573SFam Zheng { 319e253f4b8SKevin Wolf BlockDriverState *source = blk_bs(s->common.blk); 3209c83625bSMax Reitz int64_t sector_num, first_chunk; 321e5b43573SFam Zheng uint64_t delay_ns = 0; 322e5b43573SFam Zheng /* At least the first dirty chunk is mirrored in one iteration. */ 323e5b43573SFam Zheng int nb_chunks = 1; 324e5b43573SFam Zheng int64_t end = s->bdev_length / BDRV_SECTOR_SIZE; 325e5b43573SFam Zheng int sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 326*4b5004d9SDenis V. Lunev bool write_zeroes_ok = bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)); 327e5b43573SFam Zheng 328e5b43573SFam Zheng sector_num = hbitmap_iter_next(&s->hbi); 329e5b43573SFam Zheng if (sector_num < 0) { 330e5b43573SFam Zheng bdrv_dirty_iter_init(s->dirty_bitmap, &s->hbi); 331e5b43573SFam Zheng sector_num = hbitmap_iter_next(&s->hbi); 332e5b43573SFam Zheng trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap)); 333e5b43573SFam Zheng assert(sector_num >= 0); 334e5b43573SFam Zheng } 335e5b43573SFam Zheng 3369c83625bSMax Reitz first_chunk = sector_num / sectors_per_chunk; 3379c83625bSMax Reitz while (test_bit(first_chunk, s->in_flight_bitmap)) { 338ff04198bSDenis V. Lunev trace_mirror_yield_in_flight(s, sector_num, s->in_flight); 3399c83625bSMax Reitz mirror_wait_for_io(s); 3409c83625bSMax Reitz } 3419c83625bSMax Reitz 342565ac01fSStefan Hajnoczi block_job_pause_point(&s->common); 343565ac01fSStefan Hajnoczi 344e5b43573SFam Zheng /* Find the number of consective dirty chunks following the first dirty 345e5b43573SFam Zheng * one, and wait for in flight requests in them. */ 346e5b43573SFam Zheng while (nb_chunks * sectors_per_chunk < (s->buf_size >> BDRV_SECTOR_BITS)) { 347e5b43573SFam Zheng int64_t hbitmap_next; 348e5b43573SFam Zheng int64_t next_sector = sector_num + nb_chunks * sectors_per_chunk; 349e5b43573SFam Zheng int64_t next_chunk = next_sector / sectors_per_chunk; 350e5b43573SFam Zheng if (next_sector >= end || 351e5b43573SFam Zheng !bdrv_get_dirty(source, s->dirty_bitmap, next_sector)) { 352e5b43573SFam Zheng break; 353e5b43573SFam Zheng } 354e5b43573SFam Zheng if (test_bit(next_chunk, s->in_flight_bitmap)) { 355e5b43573SFam Zheng break; 356e5b43573SFam Zheng } 3579c83625bSMax Reitz 358e5b43573SFam Zheng hbitmap_next = hbitmap_iter_next(&s->hbi); 359f27a2742SMax Reitz if (hbitmap_next > next_sector || hbitmap_next < 0) { 360f27a2742SMax Reitz /* The bitmap iterator's cache is stale, refresh it */ 361f27a2742SMax Reitz bdrv_set_dirty_iter(&s->hbi, next_sector); 362f27a2742SMax Reitz hbitmap_next = hbitmap_iter_next(&s->hbi); 363f27a2742SMax Reitz } 364e5b43573SFam Zheng assert(hbitmap_next == next_sector); 365e5b43573SFam Zheng nb_chunks++; 366e5b43573SFam Zheng } 367e5b43573SFam Zheng 368e5b43573SFam Zheng /* Clear dirty bits before querying the block status, because 369e5b43573SFam Zheng * calling bdrv_get_block_status_above could yield - if some blocks are 370e5b43573SFam Zheng * marked dirty in this window, we need to know. 371e5b43573SFam Zheng */ 372e5b43573SFam Zheng bdrv_reset_dirty_bitmap(s->dirty_bitmap, sector_num, 373e5b43573SFam Zheng nb_chunks * sectors_per_chunk); 374e5b43573SFam Zheng bitmap_set(s->in_flight_bitmap, sector_num / sectors_per_chunk, nb_chunks); 375e5b43573SFam Zheng while (nb_chunks > 0 && sector_num < end) { 376e5b43573SFam Zheng int ret; 377*4b5004d9SDenis V. Lunev int io_sectors, io_sectors_acct; 378e5b43573SFam Zheng BlockDriverState *file; 379e5b43573SFam Zheng enum MirrorMethod { 380e5b43573SFam Zheng MIRROR_METHOD_COPY, 381e5b43573SFam Zheng MIRROR_METHOD_ZERO, 382e5b43573SFam Zheng MIRROR_METHOD_DISCARD 383e5b43573SFam Zheng } mirror_method = MIRROR_METHOD_COPY; 384e5b43573SFam Zheng 385e5b43573SFam Zheng assert(!(sector_num % sectors_per_chunk)); 386e5b43573SFam Zheng ret = bdrv_get_block_status_above(source, NULL, sector_num, 387e5b43573SFam Zheng nb_chunks * sectors_per_chunk, 388e5b43573SFam Zheng &io_sectors, &file); 389e5b43573SFam Zheng if (ret < 0) { 390e5b43573SFam Zheng io_sectors = nb_chunks * sectors_per_chunk; 391e5b43573SFam Zheng } 392e5b43573SFam Zheng 393e5b43573SFam Zheng io_sectors -= io_sectors % sectors_per_chunk; 394e5b43573SFam Zheng if (io_sectors < sectors_per_chunk) { 395e5b43573SFam Zheng io_sectors = sectors_per_chunk; 396e5b43573SFam Zheng } else if (ret >= 0 && !(ret & BDRV_BLOCK_DATA)) { 397e5b43573SFam Zheng int64_t target_sector_num; 398e5b43573SFam Zheng int target_nb_sectors; 399244483e6SKevin Wolf bdrv_round_sectors_to_clusters(blk_bs(s->target), sector_num, 400244483e6SKevin Wolf io_sectors, &target_sector_num, 401244483e6SKevin Wolf &target_nb_sectors); 402e5b43573SFam Zheng if (target_sector_num == sector_num && 403e5b43573SFam Zheng target_nb_sectors == io_sectors) { 404e5b43573SFam Zheng mirror_method = ret & BDRV_BLOCK_ZERO ? 405e5b43573SFam Zheng MIRROR_METHOD_ZERO : 406e5b43573SFam Zheng MIRROR_METHOD_DISCARD; 407e5b43573SFam Zheng } 408e5b43573SFam Zheng } 409e5b43573SFam Zheng 4104150ae60SFam Zheng mirror_clip_sectors(s, sector_num, &io_sectors); 411e5b43573SFam Zheng switch (mirror_method) { 412e5b43573SFam Zheng case MIRROR_METHOD_COPY: 413e5b43573SFam Zheng io_sectors = mirror_do_read(s, sector_num, io_sectors); 414*4b5004d9SDenis V. Lunev io_sectors_acct = io_sectors; 415e5b43573SFam Zheng break; 416e5b43573SFam Zheng case MIRROR_METHOD_ZERO: 417e5b43573SFam Zheng case MIRROR_METHOD_DISCARD: 418*4b5004d9SDenis V. Lunev mirror_do_zero_or_discard(s, sector_num, io_sectors, 419*4b5004d9SDenis V. Lunev mirror_method == MIRROR_METHOD_DISCARD); 420*4b5004d9SDenis V. Lunev if (write_zeroes_ok) { 421*4b5004d9SDenis V. Lunev io_sectors_acct = 0; 422*4b5004d9SDenis V. Lunev } else { 423*4b5004d9SDenis V. Lunev io_sectors_acct = io_sectors; 424*4b5004d9SDenis V. Lunev } 425e5b43573SFam Zheng break; 426e5b43573SFam Zheng default: 427e5b43573SFam Zheng abort(); 428e5b43573SFam Zheng } 429e5b43573SFam Zheng assert(io_sectors); 430e5b43573SFam Zheng sector_num += io_sectors; 4314150ae60SFam Zheng nb_chunks -= DIV_ROUND_UP(io_sectors, sectors_per_chunk); 432f14a39ccSSascha Silbe if (s->common.speed) { 433*4b5004d9SDenis V. Lunev delay_ns = ratelimit_calculate_delay(&s->limit, io_sectors_acct); 434f14a39ccSSascha Silbe } 435dcfb3bebSFam Zheng } 436cc8c9d6cSPaolo Bonzini return delay_ns; 437893f7ebaSPaolo Bonzini } 438b952b558SPaolo Bonzini 439402a4741SPaolo Bonzini static void mirror_free_init(MirrorBlockJob *s) 440402a4741SPaolo Bonzini { 441402a4741SPaolo Bonzini int granularity = s->granularity; 442402a4741SPaolo Bonzini size_t buf_size = s->buf_size; 443402a4741SPaolo Bonzini uint8_t *buf = s->buf; 444402a4741SPaolo Bonzini 445402a4741SPaolo Bonzini assert(s->buf_free_count == 0); 446402a4741SPaolo Bonzini QSIMPLEQ_INIT(&s->buf_free); 447402a4741SPaolo Bonzini while (buf_size != 0) { 448402a4741SPaolo Bonzini MirrorBuffer *cur = (MirrorBuffer *)buf; 449402a4741SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&s->buf_free, cur, next); 450402a4741SPaolo Bonzini s->buf_free_count++; 451402a4741SPaolo Bonzini buf_size -= granularity; 452402a4741SPaolo Bonzini buf += granularity; 453402a4741SPaolo Bonzini } 454402a4741SPaolo Bonzini } 455402a4741SPaolo Bonzini 456bd48bde8SPaolo Bonzini static void mirror_drain(MirrorBlockJob *s) 457bd48bde8SPaolo Bonzini { 458bd48bde8SPaolo Bonzini while (s->in_flight > 0) { 45921cd917fSFam Zheng mirror_wait_for_io(s); 460bd48bde8SPaolo Bonzini } 461893f7ebaSPaolo Bonzini } 462893f7ebaSPaolo Bonzini 4635a7e7a0bSStefan Hajnoczi typedef struct { 4645a7e7a0bSStefan Hajnoczi int ret; 4655a7e7a0bSStefan Hajnoczi } MirrorExitData; 4665a7e7a0bSStefan Hajnoczi 4675a7e7a0bSStefan Hajnoczi static void mirror_exit(BlockJob *job, void *opaque) 4685a7e7a0bSStefan Hajnoczi { 4695a7e7a0bSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 4705a7e7a0bSStefan Hajnoczi MirrorExitData *data = opaque; 4715a7e7a0bSStefan Hajnoczi AioContext *replace_aio_context = NULL; 472e253f4b8SKevin Wolf BlockDriverState *src = blk_bs(s->common.blk); 473e253f4b8SKevin Wolf BlockDriverState *target_bs = blk_bs(s->target); 4743f09bfbcSKevin Wolf 4753f09bfbcSKevin Wolf /* Make sure that the source BDS doesn't go away before we called 4763f09bfbcSKevin Wolf * block_job_completed(). */ 4773f09bfbcSKevin Wolf bdrv_ref(src); 4785a7e7a0bSStefan Hajnoczi 4795a7e7a0bSStefan Hajnoczi if (s->to_replace) { 4805a7e7a0bSStefan Hajnoczi replace_aio_context = bdrv_get_aio_context(s->to_replace); 4815a7e7a0bSStefan Hajnoczi aio_context_acquire(replace_aio_context); 4825a7e7a0bSStefan Hajnoczi } 4835a7e7a0bSStefan Hajnoczi 4845a7e7a0bSStefan Hajnoczi if (s->should_complete && data->ret == 0) { 485e253f4b8SKevin Wolf BlockDriverState *to_replace = src; 4865a7e7a0bSStefan Hajnoczi if (s->to_replace) { 4875a7e7a0bSStefan Hajnoczi to_replace = s->to_replace; 4885a7e7a0bSStefan Hajnoczi } 48940365552SKevin Wolf 490e253f4b8SKevin Wolf if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) { 491e253f4b8SKevin Wolf bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL); 4925a7e7a0bSStefan Hajnoczi } 493b8804815SKevin Wolf 494b8804815SKevin Wolf /* The mirror job has no requests in flight any more, but we need to 495b8804815SKevin Wolf * drain potential other users of the BDS before changing the graph. */ 496e253f4b8SKevin Wolf bdrv_drained_begin(target_bs); 497e253f4b8SKevin Wolf bdrv_replace_in_backing_chain(to_replace, target_bs); 498e253f4b8SKevin Wolf bdrv_drained_end(target_bs); 499b8804815SKevin Wolf 500b6d2e599SKevin Wolf /* We just changed the BDS the job BB refers to */ 501b6d2e599SKevin Wolf blk_remove_bs(job->blk); 502b6d2e599SKevin Wolf blk_insert_bs(job->blk, src); 5035a7e7a0bSStefan Hajnoczi } 5045a7e7a0bSStefan Hajnoczi if (s->to_replace) { 5055a7e7a0bSStefan Hajnoczi bdrv_op_unblock_all(s->to_replace, s->replace_blocker); 5065a7e7a0bSStefan Hajnoczi error_free(s->replace_blocker); 5075a7e7a0bSStefan Hajnoczi bdrv_unref(s->to_replace); 5085a7e7a0bSStefan Hajnoczi } 5095a7e7a0bSStefan Hajnoczi if (replace_aio_context) { 5105a7e7a0bSStefan Hajnoczi aio_context_release(replace_aio_context); 5115a7e7a0bSStefan Hajnoczi } 5125a7e7a0bSStefan Hajnoczi g_free(s->replaces); 513e253f4b8SKevin Wolf bdrv_op_unblock_all(target_bs, s->common.blocker); 514e253f4b8SKevin Wolf blk_unref(s->target); 5155a7e7a0bSStefan Hajnoczi block_job_completed(&s->common, data->ret); 5165a7e7a0bSStefan Hajnoczi g_free(data); 517176c3699SFam Zheng bdrv_drained_end(src); 518ab27c3b5SFam Zheng if (qemu_get_aio_context() == bdrv_get_aio_context(src)) { 519ab27c3b5SFam Zheng aio_enable_external(iohandler_get_aio_context()); 520ab27c3b5SFam Zheng } 5213f09bfbcSKevin Wolf bdrv_unref(src); 5225a7e7a0bSStefan Hajnoczi } 5235a7e7a0bSStefan Hajnoczi 52449efb1f5SDenis V. Lunev static void mirror_throttle(MirrorBlockJob *s) 52549efb1f5SDenis V. Lunev { 52649efb1f5SDenis V. Lunev int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 52749efb1f5SDenis V. Lunev 52849efb1f5SDenis V. Lunev if (now - s->last_pause_ns > SLICE_TIME) { 52949efb1f5SDenis V. Lunev s->last_pause_ns = now; 53049efb1f5SDenis V. Lunev block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, 0); 53149efb1f5SDenis V. Lunev } else { 53249efb1f5SDenis V. Lunev block_job_pause_point(&s->common); 53349efb1f5SDenis V. Lunev } 53449efb1f5SDenis V. Lunev } 53549efb1f5SDenis V. Lunev 536c0b363adSDenis V. Lunev static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s) 537c0b363adSDenis V. Lunev { 538c0b363adSDenis V. Lunev int64_t sector_num, end; 539c0b363adSDenis V. Lunev BlockDriverState *base = s->base; 540c0b363adSDenis V. Lunev BlockDriverState *bs = blk_bs(s->common.blk); 541c0b363adSDenis V. Lunev BlockDriverState *target_bs = blk_bs(s->target); 542c0b363adSDenis V. Lunev int ret, n; 543c0b363adSDenis V. Lunev 544c0b363adSDenis V. Lunev end = s->bdev_length / BDRV_SECTOR_SIZE; 545c0b363adSDenis V. Lunev 546b7d5062cSDenis V. Lunev if (base == NULL && !bdrv_has_zero_init(target_bs)) { 547c7c2769cSDenis V. Lunev if (!bdrv_can_write_zeroes_with_unmap(target_bs)) { 548b7d5062cSDenis V. Lunev bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, end); 549b7d5062cSDenis V. Lunev return 0; 550b7d5062cSDenis V. Lunev } 551b7d5062cSDenis V. Lunev 552c7c2769cSDenis V. Lunev for (sector_num = 0; sector_num < end; ) { 553c7c2769cSDenis V. Lunev int nb_sectors = MIN(end - sector_num, 554c7c2769cSDenis V. Lunev QEMU_ALIGN_DOWN(INT_MAX, s->granularity) >> BDRV_SECTOR_BITS); 555c7c2769cSDenis V. Lunev 556c7c2769cSDenis V. Lunev mirror_throttle(s); 557c7c2769cSDenis V. Lunev 558c7c2769cSDenis V. Lunev if (block_job_is_cancelled(&s->common)) { 559c7c2769cSDenis V. Lunev return 0; 560c7c2769cSDenis V. Lunev } 561c7c2769cSDenis V. Lunev 562c7c2769cSDenis V. Lunev if (s->in_flight >= MAX_IN_FLIGHT) { 563c7c2769cSDenis V. Lunev trace_mirror_yield(s, s->in_flight, s->buf_free_count, -1); 564c7c2769cSDenis V. Lunev mirror_wait_for_io(s); 565c7c2769cSDenis V. Lunev continue; 566c7c2769cSDenis V. Lunev } 567c7c2769cSDenis V. Lunev 568c7c2769cSDenis V. Lunev mirror_do_zero_or_discard(s, sector_num, nb_sectors, false); 569c7c2769cSDenis V. Lunev sector_num += nb_sectors; 570c7c2769cSDenis V. Lunev } 571c7c2769cSDenis V. Lunev 572c7c2769cSDenis V. Lunev mirror_drain(s); 573c7c2769cSDenis V. Lunev } 574c7c2769cSDenis V. Lunev 575c0b363adSDenis V. Lunev /* First part, loop on the sectors and initialize the dirty bitmap. */ 576c0b363adSDenis V. Lunev for (sector_num = 0; sector_num < end; ) { 577c0b363adSDenis V. Lunev /* Just to make sure we are not exceeding int limit. */ 578c0b363adSDenis V. Lunev int nb_sectors = MIN(INT_MAX >> BDRV_SECTOR_BITS, 579c0b363adSDenis V. Lunev end - sector_num); 580c0b363adSDenis V. Lunev 581c0b363adSDenis V. Lunev mirror_throttle(s); 582c0b363adSDenis V. Lunev 583c0b363adSDenis V. Lunev if (block_job_is_cancelled(&s->common)) { 584c0b363adSDenis V. Lunev return 0; 585c0b363adSDenis V. Lunev } 586c0b363adSDenis V. Lunev 587c0b363adSDenis V. Lunev ret = bdrv_is_allocated_above(bs, base, sector_num, nb_sectors, &n); 588c0b363adSDenis V. Lunev if (ret < 0) { 589c0b363adSDenis V. Lunev return ret; 590c0b363adSDenis V. Lunev } 591c0b363adSDenis V. Lunev 592c0b363adSDenis V. Lunev assert(n > 0); 593b7d5062cSDenis V. Lunev if (ret == 1) { 594c0b363adSDenis V. Lunev bdrv_set_dirty_bitmap(s->dirty_bitmap, sector_num, n); 595c0b363adSDenis V. Lunev } 596c0b363adSDenis V. Lunev sector_num += n; 597c0b363adSDenis V. Lunev } 598c0b363adSDenis V. Lunev return 0; 599c0b363adSDenis V. Lunev } 600c0b363adSDenis V. Lunev 601893f7ebaSPaolo Bonzini static void coroutine_fn mirror_run(void *opaque) 602893f7ebaSPaolo Bonzini { 603893f7ebaSPaolo Bonzini MirrorBlockJob *s = opaque; 6045a7e7a0bSStefan Hajnoczi MirrorExitData *data; 605e253f4b8SKevin Wolf BlockDriverState *bs = blk_bs(s->common.blk); 606e253f4b8SKevin Wolf BlockDriverState *target_bs = blk_bs(s->target); 607c0b363adSDenis V. Lunev int64_t length; 608b812f671SPaolo Bonzini BlockDriverInfo bdi; 6091d33936eSJeff Cody char backing_filename[2]; /* we only need 2 characters because we are only 6101d33936eSJeff Cody checking for a NULL string */ 611893f7ebaSPaolo Bonzini int ret = 0; 612e5b43573SFam Zheng int target_cluster_size = BDRV_SECTOR_SIZE; 613893f7ebaSPaolo Bonzini 614893f7ebaSPaolo Bonzini if (block_job_is_cancelled(&s->common)) { 615893f7ebaSPaolo Bonzini goto immediate_exit; 616893f7ebaSPaolo Bonzini } 617893f7ebaSPaolo Bonzini 618b21c7652SMax Reitz s->bdev_length = bdrv_getlength(bs); 619b21c7652SMax Reitz if (s->bdev_length < 0) { 620b21c7652SMax Reitz ret = s->bdev_length; 621373df5b1SFam Zheng goto immediate_exit; 622b21c7652SMax Reitz } else if (s->bdev_length == 0) { 6239e48b025SFam Zheng /* Report BLOCK_JOB_READY and wait for complete. */ 6249e48b025SFam Zheng block_job_event_ready(&s->common); 6259e48b025SFam Zheng s->synced = true; 6269e48b025SFam Zheng while (!block_job_is_cancelled(&s->common) && !s->should_complete) { 6279e48b025SFam Zheng block_job_yield(&s->common); 6289e48b025SFam Zheng } 6299e48b025SFam Zheng s->common.cancelled = false; 6309e48b025SFam Zheng goto immediate_exit; 631893f7ebaSPaolo Bonzini } 632893f7ebaSPaolo Bonzini 633b21c7652SMax Reitz length = DIV_ROUND_UP(s->bdev_length, s->granularity); 634402a4741SPaolo Bonzini s->in_flight_bitmap = bitmap_new(length); 635402a4741SPaolo Bonzini 636b812f671SPaolo Bonzini /* If we have no backing file yet in the destination, we cannot let 637b812f671SPaolo Bonzini * the destination do COW. Instead, we copy sectors around the 638b812f671SPaolo Bonzini * dirty data if needed. We need a bitmap to do that. 639b812f671SPaolo Bonzini */ 640e253f4b8SKevin Wolf bdrv_get_backing_filename(target_bs, backing_filename, 641b812f671SPaolo Bonzini sizeof(backing_filename)); 642e253f4b8SKevin Wolf if (!bdrv_get_info(target_bs, &bdi) && bdi.cluster_size) { 643e5b43573SFam Zheng target_cluster_size = bdi.cluster_size; 644c3cc95bdSFam Zheng } 645e253f4b8SKevin Wolf if (backing_filename[0] && !target_bs->backing 646e5b43573SFam Zheng && s->granularity < target_cluster_size) { 647e5b43573SFam Zheng s->buf_size = MAX(s->buf_size, target_cluster_size); 648b812f671SPaolo Bonzini s->cow_bitmap = bitmap_new(length); 649b812f671SPaolo Bonzini } 650e5b43573SFam Zheng s->target_cluster_sectors = target_cluster_size >> BDRV_SECTOR_BITS; 651e253f4b8SKevin Wolf s->max_iov = MIN(bs->bl.max_iov, target_bs->bl.max_iov); 652b812f671SPaolo Bonzini 6537504edf4SKevin Wolf s->buf = qemu_try_blockalign(bs, s->buf_size); 6547504edf4SKevin Wolf if (s->buf == NULL) { 6557504edf4SKevin Wolf ret = -ENOMEM; 6567504edf4SKevin Wolf goto immediate_exit; 6577504edf4SKevin Wolf } 6587504edf4SKevin Wolf 659402a4741SPaolo Bonzini mirror_free_init(s); 660893f7ebaSPaolo Bonzini 66149efb1f5SDenis V. Lunev s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 66203544a6eSFam Zheng if (!s->is_none_mode) { 663c0b363adSDenis V. Lunev ret = mirror_dirty_init(s); 664c0b363adSDenis V. Lunev if (ret < 0 || block_job_is_cancelled(&s->common)) { 6654c0cbd6fSFam Zheng goto immediate_exit; 6664c0cbd6fSFam Zheng } 667893f7ebaSPaolo Bonzini } 668893f7ebaSPaolo Bonzini 66920dca810SJohn Snow bdrv_dirty_iter_init(s->dirty_bitmap, &s->hbi); 670893f7ebaSPaolo Bonzini for (;;) { 671cc8c9d6cSPaolo Bonzini uint64_t delay_ns = 0; 67249efb1f5SDenis V. Lunev int64_t cnt, delta; 673893f7ebaSPaolo Bonzini bool should_complete; 674893f7ebaSPaolo Bonzini 675bd48bde8SPaolo Bonzini if (s->ret < 0) { 676bd48bde8SPaolo Bonzini ret = s->ret; 677893f7ebaSPaolo Bonzini goto immediate_exit; 678893f7ebaSPaolo Bonzini } 679bd48bde8SPaolo Bonzini 680565ac01fSStefan Hajnoczi block_job_pause_point(&s->common); 681565ac01fSStefan Hajnoczi 68220dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 683b21c7652SMax Reitz /* s->common.offset contains the number of bytes already processed so 684b21c7652SMax Reitz * far, cnt is the number of dirty sectors remaining and 685b21c7652SMax Reitz * s->sectors_in_flight is the number of sectors currently being 686b21c7652SMax Reitz * processed; together those are the current total operation length */ 687b21c7652SMax Reitz s->common.len = s->common.offset + 688b21c7652SMax Reitz (cnt + s->sectors_in_flight) * BDRV_SECTOR_SIZE; 689bd48bde8SPaolo Bonzini 690bd48bde8SPaolo Bonzini /* Note that even when no rate limit is applied we need to yield 691a7282330SFam Zheng * periodically with no pending I/O so that bdrv_drain_all() returns. 692bd48bde8SPaolo Bonzini * We do so every SLICE_TIME nanoseconds, or when there is an error, 693bd48bde8SPaolo Bonzini * or when the source is clean, whichever comes first. 694bd48bde8SPaolo Bonzini */ 69549efb1f5SDenis V. Lunev delta = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->last_pause_ns; 69649efb1f5SDenis V. Lunev if (delta < SLICE_TIME && 697bd48bde8SPaolo Bonzini s->common.iostatus == BLOCK_DEVICE_IO_STATUS_OK) { 698402a4741SPaolo Bonzini if (s->in_flight == MAX_IN_FLIGHT || s->buf_free_count == 0 || 699402a4741SPaolo Bonzini (cnt == 0 && s->in_flight > 0)) { 700402a4741SPaolo Bonzini trace_mirror_yield(s, s->in_flight, s->buf_free_count, cnt); 70121cd917fSFam Zheng mirror_wait_for_io(s); 702bd48bde8SPaolo Bonzini continue; 703bd48bde8SPaolo Bonzini } else if (cnt != 0) { 704cc8c9d6cSPaolo Bonzini delay_ns = mirror_iteration(s); 705893f7ebaSPaolo Bonzini } 706cc8c9d6cSPaolo Bonzini } 707893f7ebaSPaolo Bonzini 708893f7ebaSPaolo Bonzini should_complete = false; 709bd48bde8SPaolo Bonzini if (s->in_flight == 0 && cnt == 0) { 710893f7ebaSPaolo Bonzini trace_mirror_before_flush(s); 711e253f4b8SKevin Wolf ret = blk_flush(s->target); 712893f7ebaSPaolo Bonzini if (ret < 0) { 713a589569fSWenchao Xia if (mirror_error_action(s, false, -ret) == 714a589569fSWenchao Xia BLOCK_ERROR_ACTION_REPORT) { 715893f7ebaSPaolo Bonzini goto immediate_exit; 716893f7ebaSPaolo Bonzini } 717b952b558SPaolo Bonzini } else { 718893f7ebaSPaolo Bonzini /* We're out of the streaming phase. From now on, if the job 719893f7ebaSPaolo Bonzini * is cancelled we will actually complete all pending I/O and 720893f7ebaSPaolo Bonzini * report completion. This way, block-job-cancel will leave 721893f7ebaSPaolo Bonzini * the target in a consistent state. 722893f7ebaSPaolo Bonzini */ 723d63ffd87SPaolo Bonzini if (!s->synced) { 724bcada37bSWenchao Xia block_job_event_ready(&s->common); 725d63ffd87SPaolo Bonzini s->synced = true; 726d63ffd87SPaolo Bonzini } 727d63ffd87SPaolo Bonzini 728d63ffd87SPaolo Bonzini should_complete = s->should_complete || 729d63ffd87SPaolo Bonzini block_job_is_cancelled(&s->common); 73020dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 731893f7ebaSPaolo Bonzini } 732b952b558SPaolo Bonzini } 733893f7ebaSPaolo Bonzini 734893f7ebaSPaolo Bonzini if (cnt == 0 && should_complete) { 735893f7ebaSPaolo Bonzini /* The dirty bitmap is not updated while operations are pending. 736893f7ebaSPaolo Bonzini * If we're about to exit, wait for pending operations before 737893f7ebaSPaolo Bonzini * calling bdrv_get_dirty_count(bs), or we may exit while the 738893f7ebaSPaolo Bonzini * source has dirty data to copy! 739893f7ebaSPaolo Bonzini * 740893f7ebaSPaolo Bonzini * Note that I/O can be submitted by the guest while 741893f7ebaSPaolo Bonzini * mirror_populate runs. 742893f7ebaSPaolo Bonzini */ 743893f7ebaSPaolo Bonzini trace_mirror_before_drain(s, cnt); 74439bf92ddSFam Zheng bdrv_co_drain(bs); 74520dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 746893f7ebaSPaolo Bonzini } 747893f7ebaSPaolo Bonzini 748893f7ebaSPaolo Bonzini ret = 0; 749cc8c9d6cSPaolo Bonzini trace_mirror_before_sleep(s, cnt, s->synced, delay_ns); 750d63ffd87SPaolo Bonzini if (!s->synced) { 7517483d1e5SAlex Bligh block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); 752893f7ebaSPaolo Bonzini if (block_job_is_cancelled(&s->common)) { 753893f7ebaSPaolo Bonzini break; 754893f7ebaSPaolo Bonzini } 755893f7ebaSPaolo Bonzini } else if (!should_complete) { 756bd48bde8SPaolo Bonzini delay_ns = (s->in_flight == 0 && cnt == 0 ? SLICE_TIME : 0); 7577483d1e5SAlex Bligh block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); 758893f7ebaSPaolo Bonzini } else if (cnt == 0) { 759893f7ebaSPaolo Bonzini /* The two disks are in sync. Exit and report successful 760893f7ebaSPaolo Bonzini * completion. 761893f7ebaSPaolo Bonzini */ 762893f7ebaSPaolo Bonzini assert(QLIST_EMPTY(&bs->tracked_requests)); 763893f7ebaSPaolo Bonzini s->common.cancelled = false; 764893f7ebaSPaolo Bonzini break; 765893f7ebaSPaolo Bonzini } 76649efb1f5SDenis V. Lunev s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 767893f7ebaSPaolo Bonzini } 768893f7ebaSPaolo Bonzini 769893f7ebaSPaolo Bonzini immediate_exit: 770bd48bde8SPaolo Bonzini if (s->in_flight > 0) { 771bd48bde8SPaolo Bonzini /* We get here only if something went wrong. Either the job failed, 772bd48bde8SPaolo Bonzini * or it was cancelled prematurely so that we do not guarantee that 773bd48bde8SPaolo Bonzini * the target is a copy of the source. 774bd48bde8SPaolo Bonzini */ 775bd48bde8SPaolo Bonzini assert(ret < 0 || (!s->synced && block_job_is_cancelled(&s->common))); 776bd48bde8SPaolo Bonzini mirror_drain(s); 777bd48bde8SPaolo Bonzini } 778bd48bde8SPaolo Bonzini 779bd48bde8SPaolo Bonzini assert(s->in_flight == 0); 7807191bf31SMarkus Armbruster qemu_vfree(s->buf); 781b812f671SPaolo Bonzini g_free(s->cow_bitmap); 782402a4741SPaolo Bonzini g_free(s->in_flight_bitmap); 783e4654d2dSFam Zheng bdrv_release_dirty_bitmap(bs, s->dirty_bitmap); 7845a7e7a0bSStefan Hajnoczi 7855a7e7a0bSStefan Hajnoczi data = g_malloc(sizeof(*data)); 7865a7e7a0bSStefan Hajnoczi data->ret = ret; 787176c3699SFam Zheng /* Before we switch to target in mirror_exit, make sure data doesn't 788176c3699SFam Zheng * change. */ 789e253f4b8SKevin Wolf bdrv_drained_begin(bs); 790ab27c3b5SFam Zheng if (qemu_get_aio_context() == bdrv_get_aio_context(bs)) { 791ab27c3b5SFam Zheng /* FIXME: virtio host notifiers run on iohandler_ctx, therefore the 792ab27c3b5SFam Zheng * above bdrv_drained_end isn't enough to quiesce it. This is ugly, we 793ab27c3b5SFam Zheng * need a block layer API change to achieve this. */ 794ab27c3b5SFam Zheng aio_disable_external(iohandler_get_aio_context()); 795ab27c3b5SFam Zheng } 7965a7e7a0bSStefan Hajnoczi block_job_defer_to_main_loop(&s->common, mirror_exit, data); 797893f7ebaSPaolo Bonzini } 798893f7ebaSPaolo Bonzini 799893f7ebaSPaolo Bonzini static void mirror_set_speed(BlockJob *job, int64_t speed, Error **errp) 800893f7ebaSPaolo Bonzini { 801893f7ebaSPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 802893f7ebaSPaolo Bonzini 803893f7ebaSPaolo Bonzini if (speed < 0) { 804c6bd8c70SMarkus Armbruster error_setg(errp, QERR_INVALID_PARAMETER, "speed"); 805893f7ebaSPaolo Bonzini return; 806893f7ebaSPaolo Bonzini } 807893f7ebaSPaolo Bonzini ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME); 808893f7ebaSPaolo Bonzini } 809893f7ebaSPaolo Bonzini 810d63ffd87SPaolo Bonzini static void mirror_complete(BlockJob *job, Error **errp) 811d63ffd87SPaolo Bonzini { 812d63ffd87SPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 813274fcceeSMax Reitz BlockDriverState *src, *target; 814d63ffd87SPaolo Bonzini 815274fcceeSMax Reitz src = blk_bs(job->blk); 816274fcceeSMax Reitz target = blk_bs(s->target); 817274fcceeSMax Reitz 818d63ffd87SPaolo Bonzini if (!s->synced) { 8199df229c3SAlberto Garcia error_setg(errp, "The active block job '%s' cannot be completed", 8209df229c3SAlberto Garcia job->id); 821d63ffd87SPaolo Bonzini return; 822d63ffd87SPaolo Bonzini } 823d63ffd87SPaolo Bonzini 824274fcceeSMax Reitz if (s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) { 825274fcceeSMax Reitz int ret; 826274fcceeSMax Reitz 827274fcceeSMax Reitz assert(!target->backing); 828274fcceeSMax Reitz ret = bdrv_open_backing_file(target, NULL, "backing", errp); 829274fcceeSMax Reitz if (ret < 0) { 830274fcceeSMax Reitz return; 831274fcceeSMax Reitz } 832274fcceeSMax Reitz } 833274fcceeSMax Reitz 83415d67298SChanglong Xie /* block all operations on to_replace bs */ 83509158f00SBenoît Canet if (s->replaces) { 8365a7e7a0bSStefan Hajnoczi AioContext *replace_aio_context; 8375a7e7a0bSStefan Hajnoczi 838e12f3784SWen Congyang s->to_replace = bdrv_find_node(s->replaces); 83909158f00SBenoît Canet if (!s->to_replace) { 840e12f3784SWen Congyang error_setg(errp, "Node name '%s' not found", s->replaces); 84109158f00SBenoît Canet return; 84209158f00SBenoît Canet } 84309158f00SBenoît Canet 8445a7e7a0bSStefan Hajnoczi replace_aio_context = bdrv_get_aio_context(s->to_replace); 8455a7e7a0bSStefan Hajnoczi aio_context_acquire(replace_aio_context); 8465a7e7a0bSStefan Hajnoczi 84709158f00SBenoît Canet error_setg(&s->replace_blocker, 84809158f00SBenoît Canet "block device is in use by block-job-complete"); 84909158f00SBenoît Canet bdrv_op_block_all(s->to_replace, s->replace_blocker); 85009158f00SBenoît Canet bdrv_ref(s->to_replace); 8515a7e7a0bSStefan Hajnoczi 8525a7e7a0bSStefan Hajnoczi aio_context_release(replace_aio_context); 85309158f00SBenoît Canet } 85409158f00SBenoît Canet 855274fcceeSMax Reitz if (s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) { 856274fcceeSMax Reitz BlockDriverState *backing = s->is_none_mode ? src : s->base; 857274fcceeSMax Reitz if (backing_bs(target) != backing) { 858274fcceeSMax Reitz bdrv_set_backing_hd(target, backing); 859274fcceeSMax Reitz } 860274fcceeSMax Reitz } 861274fcceeSMax Reitz 862d63ffd87SPaolo Bonzini s->should_complete = true; 863751ebd76SFam Zheng block_job_enter(&s->common); 864d63ffd87SPaolo Bonzini } 865d63ffd87SPaolo Bonzini 866565ac01fSStefan Hajnoczi /* There is no matching mirror_resume() because mirror_run() will begin 867565ac01fSStefan Hajnoczi * iterating again when the job is resumed. 868565ac01fSStefan Hajnoczi */ 869565ac01fSStefan Hajnoczi static void coroutine_fn mirror_pause(BlockJob *job) 870565ac01fSStefan Hajnoczi { 871565ac01fSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 872565ac01fSStefan Hajnoczi 873565ac01fSStefan Hajnoczi mirror_drain(s); 874565ac01fSStefan Hajnoczi } 875565ac01fSStefan Hajnoczi 876565ac01fSStefan Hajnoczi static void mirror_attached_aio_context(BlockJob *job, AioContext *new_context) 877565ac01fSStefan Hajnoczi { 878565ac01fSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 879565ac01fSStefan Hajnoczi 880565ac01fSStefan Hajnoczi blk_set_aio_context(s->target, new_context); 881565ac01fSStefan Hajnoczi } 882565ac01fSStefan Hajnoczi 8833fc4b10aSFam Zheng static const BlockJobDriver mirror_job_driver = { 884893f7ebaSPaolo Bonzini .instance_size = sizeof(MirrorBlockJob), 88579e14bf7SFam Zheng .job_type = BLOCK_JOB_TYPE_MIRROR, 886893f7ebaSPaolo Bonzini .set_speed = mirror_set_speed, 887d63ffd87SPaolo Bonzini .complete = mirror_complete, 888565ac01fSStefan Hajnoczi .pause = mirror_pause, 889565ac01fSStefan Hajnoczi .attached_aio_context = mirror_attached_aio_context, 890893f7ebaSPaolo Bonzini }; 891893f7ebaSPaolo Bonzini 89203544a6eSFam Zheng static const BlockJobDriver commit_active_job_driver = { 89303544a6eSFam Zheng .instance_size = sizeof(MirrorBlockJob), 89403544a6eSFam Zheng .job_type = BLOCK_JOB_TYPE_COMMIT, 89503544a6eSFam Zheng .set_speed = mirror_set_speed, 89603544a6eSFam Zheng .complete = mirror_complete, 897565ac01fSStefan Hajnoczi .pause = mirror_pause, 898565ac01fSStefan Hajnoczi .attached_aio_context = mirror_attached_aio_context, 89903544a6eSFam Zheng }; 90003544a6eSFam Zheng 90171aa9867SAlberto Garcia static void mirror_start_job(const char *job_id, BlockDriverState *bs, 90271aa9867SAlberto Garcia BlockDriverState *target, const char *replaces, 9035fba6c0eSJohn Snow int64_t speed, uint32_t granularity, 90403544a6eSFam Zheng int64_t buf_size, 905274fcceeSMax Reitz BlockMirrorBackingMode backing_mode, 90603544a6eSFam Zheng BlockdevOnError on_source_error, 907b952b558SPaolo Bonzini BlockdevOnError on_target_error, 9080fc9f8eaSFam Zheng bool unmap, 909097310b5SMarkus Armbruster BlockCompletionFunc *cb, 91003544a6eSFam Zheng void *opaque, Error **errp, 91103544a6eSFam Zheng const BlockJobDriver *driver, 91203544a6eSFam Zheng bool is_none_mode, BlockDriverState *base) 913893f7ebaSPaolo Bonzini { 914893f7ebaSPaolo Bonzini MirrorBlockJob *s; 915893f7ebaSPaolo Bonzini 916eee13dfeSPaolo Bonzini if (granularity == 0) { 917341ebc2fSJohn Snow granularity = bdrv_get_default_bitmap_granularity(target); 918eee13dfeSPaolo Bonzini } 919eee13dfeSPaolo Bonzini 920eee13dfeSPaolo Bonzini assert ((granularity & (granularity - 1)) == 0); 921eee13dfeSPaolo Bonzini 92248ac0a4dSWen Congyang if (buf_size < 0) { 92348ac0a4dSWen Congyang error_setg(errp, "Invalid parameter 'buf-size'"); 92448ac0a4dSWen Congyang return; 92548ac0a4dSWen Congyang } 92648ac0a4dSWen Congyang 92748ac0a4dSWen Congyang if (buf_size == 0) { 92848ac0a4dSWen Congyang buf_size = DEFAULT_MIRROR_BUF_SIZE; 92948ac0a4dSWen Congyang } 9305bc361b8SFam Zheng 93171aa9867SAlberto Garcia s = block_job_create(job_id, driver, bs, speed, cb, opaque, errp); 932893f7ebaSPaolo Bonzini if (!s) { 933893f7ebaSPaolo Bonzini return; 934893f7ebaSPaolo Bonzini } 935893f7ebaSPaolo Bonzini 936e253f4b8SKevin Wolf s->target = blk_new(); 937e253f4b8SKevin Wolf blk_insert_bs(s->target, target); 938e253f4b8SKevin Wolf 93909158f00SBenoît Canet s->replaces = g_strdup(replaces); 940b952b558SPaolo Bonzini s->on_source_error = on_source_error; 941b952b558SPaolo Bonzini s->on_target_error = on_target_error; 94203544a6eSFam Zheng s->is_none_mode = is_none_mode; 943274fcceeSMax Reitz s->backing_mode = backing_mode; 9445bc361b8SFam Zheng s->base = base; 945eee13dfeSPaolo Bonzini s->granularity = granularity; 94648ac0a4dSWen Congyang s->buf_size = ROUND_UP(buf_size, granularity); 9470fc9f8eaSFam Zheng s->unmap = unmap; 948b812f671SPaolo Bonzini 9490db6e54aSFam Zheng s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); 950b8afb520SFam Zheng if (!s->dirty_bitmap) { 95197031164STing Wang g_free(s->replaces); 952e253f4b8SKevin Wolf blk_unref(s->target); 95318930ba3SFam Zheng block_job_unref(&s->common); 954b8afb520SFam Zheng return; 955b8afb520SFam Zheng } 95610f3cd15SAlberto Garcia 957e253f4b8SKevin Wolf bdrv_op_block_all(target, s->common.blocker); 95810f3cd15SAlberto Garcia 9590b8b8753SPaolo Bonzini s->common.co = qemu_coroutine_create(mirror_run, s); 960893f7ebaSPaolo Bonzini trace_mirror_start(bs, s, s->common.co, opaque); 9610b8b8753SPaolo Bonzini qemu_coroutine_enter(s->common.co); 962893f7ebaSPaolo Bonzini } 96303544a6eSFam Zheng 96471aa9867SAlberto Garcia void mirror_start(const char *job_id, BlockDriverState *bs, 96571aa9867SAlberto Garcia BlockDriverState *target, const char *replaces, 9665fba6c0eSJohn Snow int64_t speed, uint32_t granularity, int64_t buf_size, 967274fcceeSMax Reitz MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, 968274fcceeSMax Reitz BlockdevOnError on_source_error, 96903544a6eSFam Zheng BlockdevOnError on_target_error, 9700fc9f8eaSFam Zheng bool unmap, 971097310b5SMarkus Armbruster BlockCompletionFunc *cb, 97203544a6eSFam Zheng void *opaque, Error **errp) 97303544a6eSFam Zheng { 97403544a6eSFam Zheng bool is_none_mode; 97503544a6eSFam Zheng BlockDriverState *base; 97603544a6eSFam Zheng 9774b80ab2bSJohn Snow if (mode == MIRROR_SYNC_MODE_INCREMENTAL) { 9784b80ab2bSJohn Snow error_setg(errp, "Sync mode 'incremental' not supported"); 979d58d8453SJohn Snow return; 980d58d8453SJohn Snow } 98103544a6eSFam Zheng is_none_mode = mode == MIRROR_SYNC_MODE_NONE; 982760e0063SKevin Wolf base = mode == MIRROR_SYNC_MODE_TOP ? backing_bs(bs) : NULL; 98371aa9867SAlberto Garcia mirror_start_job(job_id, bs, target, replaces, 984274fcceeSMax Reitz speed, granularity, buf_size, backing_mode, 9850fc9f8eaSFam Zheng on_source_error, on_target_error, unmap, cb, opaque, errp, 98603544a6eSFam Zheng &mirror_job_driver, is_none_mode, base); 98703544a6eSFam Zheng } 98803544a6eSFam Zheng 989fd62c609SAlberto Garcia void commit_active_start(const char *job_id, BlockDriverState *bs, 990fd62c609SAlberto Garcia BlockDriverState *base, int64_t speed, 99103544a6eSFam Zheng BlockdevOnError on_error, 992097310b5SMarkus Armbruster BlockCompletionFunc *cb, 99303544a6eSFam Zheng void *opaque, Error **errp) 99403544a6eSFam Zheng { 9954da83585SJeff Cody int64_t length, base_length; 9964da83585SJeff Cody int orig_base_flags; 99739a611a3SJeff Cody int ret; 998cc67f4d1SJeff Cody Error *local_err = NULL; 9994da83585SJeff Cody 10004da83585SJeff Cody orig_base_flags = bdrv_get_flags(base); 10014da83585SJeff Cody 100220a63d2cSFam Zheng if (bdrv_reopen(base, bs->open_flags, errp)) { 100320a63d2cSFam Zheng return; 100420a63d2cSFam Zheng } 10054da83585SJeff Cody 10064da83585SJeff Cody length = bdrv_getlength(bs); 10074da83585SJeff Cody if (length < 0) { 100839a611a3SJeff Cody error_setg_errno(errp, -length, 100939a611a3SJeff Cody "Unable to determine length of %s", bs->filename); 10104da83585SJeff Cody goto error_restore_flags; 10114da83585SJeff Cody } 10124da83585SJeff Cody 10134da83585SJeff Cody base_length = bdrv_getlength(base); 10144da83585SJeff Cody if (base_length < 0) { 101539a611a3SJeff Cody error_setg_errno(errp, -base_length, 101639a611a3SJeff Cody "Unable to determine length of %s", base->filename); 10174da83585SJeff Cody goto error_restore_flags; 10184da83585SJeff Cody } 10194da83585SJeff Cody 10204da83585SJeff Cody if (length > base_length) { 102139a611a3SJeff Cody ret = bdrv_truncate(base, length); 102239a611a3SJeff Cody if (ret < 0) { 102339a611a3SJeff Cody error_setg_errno(errp, -ret, 102439a611a3SJeff Cody "Top image %s is larger than base image %s, and " 10254da83585SJeff Cody "resize of base image failed", 10264da83585SJeff Cody bs->filename, base->filename); 10274da83585SJeff Cody goto error_restore_flags; 10284da83585SJeff Cody } 10294da83585SJeff Cody } 10304da83585SJeff Cody 1031fd62c609SAlberto Garcia mirror_start_job(job_id, bs, base, NULL, speed, 0, 0, 103271aa9867SAlberto Garcia MIRROR_LEAVE_BACKING_CHAIN, 10330fc9f8eaSFam Zheng on_error, on_error, false, cb, opaque, &local_err, 103403544a6eSFam Zheng &commit_active_job_driver, false, base); 10350fb6395cSMarkus Armbruster if (local_err) { 1036cc67f4d1SJeff Cody error_propagate(errp, local_err); 10374da83585SJeff Cody goto error_restore_flags; 10384da83585SJeff Cody } 10394da83585SJeff Cody 10404da83585SJeff Cody return; 10414da83585SJeff Cody 10424da83585SJeff Cody error_restore_flags: 10434da83585SJeff Cody /* ignore error and errp for bdrv_reopen, because we want to propagate 10444da83585SJeff Cody * the original error */ 10454da83585SJeff Cody bdrv_reopen(base, orig_base_flags, NULL); 10464da83585SJeff Cody return; 104703544a6eSFam Zheng } 1048