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; 72893f7ebaSPaolo Bonzini } MirrorBlockJob; 73893f7ebaSPaolo Bonzini 74bd48bde8SPaolo Bonzini typedef struct MirrorOp { 75bd48bde8SPaolo Bonzini MirrorBlockJob *s; 76bd48bde8SPaolo Bonzini QEMUIOVector qiov; 77bd48bde8SPaolo Bonzini int64_t sector_num; 78bd48bde8SPaolo Bonzini int nb_sectors; 79bd48bde8SPaolo Bonzini } MirrorOp; 80bd48bde8SPaolo Bonzini 81b952b558SPaolo Bonzini static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read, 82b952b558SPaolo Bonzini int error) 83b952b558SPaolo Bonzini { 84b952b558SPaolo Bonzini s->synced = false; 85b952b558SPaolo Bonzini if (read) { 8681e254dcSKevin Wolf return block_job_error_action(&s->common, s->on_source_error, 8781e254dcSKevin Wolf true, error); 88b952b558SPaolo Bonzini } else { 8981e254dcSKevin Wolf return block_job_error_action(&s->common, s->on_target_error, 9081e254dcSKevin Wolf false, error); 91b952b558SPaolo Bonzini } 92b952b558SPaolo Bonzini } 93b952b558SPaolo Bonzini 94bd48bde8SPaolo Bonzini static void mirror_iteration_done(MirrorOp *op, int ret) 95bd48bde8SPaolo Bonzini { 96bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 97402a4741SPaolo Bonzini struct iovec *iov; 98bd48bde8SPaolo Bonzini int64_t chunk_num; 99402a4741SPaolo Bonzini int i, nb_chunks, sectors_per_chunk; 100bd48bde8SPaolo Bonzini 101bd48bde8SPaolo Bonzini trace_mirror_iteration_done(s, op->sector_num, op->nb_sectors, ret); 102bd48bde8SPaolo Bonzini 103bd48bde8SPaolo Bonzini s->in_flight--; 104b21c7652SMax Reitz s->sectors_in_flight -= op->nb_sectors; 105402a4741SPaolo Bonzini iov = op->qiov.iov; 106402a4741SPaolo Bonzini for (i = 0; i < op->qiov.niov; i++) { 107402a4741SPaolo Bonzini MirrorBuffer *buf = (MirrorBuffer *) iov[i].iov_base; 108402a4741SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&s->buf_free, buf, next); 109402a4741SPaolo Bonzini s->buf_free_count++; 110402a4741SPaolo Bonzini } 111402a4741SPaolo Bonzini 112bd48bde8SPaolo Bonzini sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 113bd48bde8SPaolo Bonzini chunk_num = op->sector_num / sectors_per_chunk; 1144150ae60SFam Zheng nb_chunks = DIV_ROUND_UP(op->nb_sectors, sectors_per_chunk); 115402a4741SPaolo Bonzini bitmap_clear(s->in_flight_bitmap, chunk_num, nb_chunks); 116b21c7652SMax Reitz if (ret >= 0) { 117b21c7652SMax Reitz if (s->cow_bitmap) { 118bd48bde8SPaolo Bonzini bitmap_set(s->cow_bitmap, chunk_num, nb_chunks); 119bd48bde8SPaolo Bonzini } 120b21c7652SMax Reitz s->common.offset += (uint64_t)op->nb_sectors * BDRV_SECTOR_SIZE; 121b21c7652SMax Reitz } 122bd48bde8SPaolo Bonzini 1236df3bf8eSZhang Min qemu_iovec_destroy(&op->qiov); 124c84b3192SPaolo Bonzini g_free(op); 1257b770c72SStefan Hajnoczi 126e424aff5SKevin Wolf if (s->waiting_for_io) { 1270b8b8753SPaolo Bonzini qemu_coroutine_enter(s->common.co); 128bd48bde8SPaolo Bonzini } 1297b770c72SStefan Hajnoczi } 130bd48bde8SPaolo Bonzini 131bd48bde8SPaolo Bonzini static void mirror_write_complete(void *opaque, int ret) 132bd48bde8SPaolo Bonzini { 133bd48bde8SPaolo Bonzini MirrorOp *op = opaque; 134bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 135bd48bde8SPaolo Bonzini if (ret < 0) { 136bd48bde8SPaolo Bonzini BlockErrorAction action; 137bd48bde8SPaolo Bonzini 13820dca810SJohn Snow bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors); 139bd48bde8SPaolo Bonzini action = mirror_error_action(s, false, -ret); 140a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { 141bd48bde8SPaolo Bonzini s->ret = ret; 142bd48bde8SPaolo Bonzini } 143bd48bde8SPaolo Bonzini } 144bd48bde8SPaolo Bonzini mirror_iteration_done(op, ret); 145bd48bde8SPaolo Bonzini } 146bd48bde8SPaolo Bonzini 147bd48bde8SPaolo Bonzini static void mirror_read_complete(void *opaque, int ret) 148bd48bde8SPaolo Bonzini { 149bd48bde8SPaolo Bonzini MirrorOp *op = opaque; 150bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 151bd48bde8SPaolo Bonzini if (ret < 0) { 152bd48bde8SPaolo Bonzini BlockErrorAction action; 153bd48bde8SPaolo Bonzini 15420dca810SJohn Snow bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors); 155bd48bde8SPaolo Bonzini action = mirror_error_action(s, true, -ret); 156a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { 157bd48bde8SPaolo Bonzini s->ret = ret; 158bd48bde8SPaolo Bonzini } 159bd48bde8SPaolo Bonzini 160bd48bde8SPaolo Bonzini mirror_iteration_done(op, ret); 161bd48bde8SPaolo Bonzini return; 162bd48bde8SPaolo Bonzini } 163e253f4b8SKevin Wolf blk_aio_pwritev(s->target, op->sector_num * BDRV_SECTOR_SIZE, &op->qiov, 16473698c30SEric Blake 0, mirror_write_complete, op); 165bd48bde8SPaolo Bonzini } 166bd48bde8SPaolo Bonzini 1674150ae60SFam Zheng static inline void mirror_clip_sectors(MirrorBlockJob *s, 1684150ae60SFam Zheng int64_t sector_num, 1694150ae60SFam Zheng int *nb_sectors) 1704150ae60SFam Zheng { 1714150ae60SFam Zheng *nb_sectors = MIN(*nb_sectors, 1724150ae60SFam Zheng s->bdev_length / BDRV_SECTOR_SIZE - sector_num); 1734150ae60SFam Zheng } 1744150ae60SFam Zheng 175e5b43573SFam Zheng /* Round sector_num and/or nb_sectors to target cluster if COW is needed, and 176e5b43573SFam Zheng * return the offset of the adjusted tail sector against original. */ 177e5b43573SFam Zheng static int mirror_cow_align(MirrorBlockJob *s, 178e5b43573SFam Zheng int64_t *sector_num, 179e5b43573SFam Zheng int *nb_sectors) 180893f7ebaSPaolo Bonzini { 181e5b43573SFam Zheng bool need_cow; 182e5b43573SFam Zheng int ret = 0; 183e5b43573SFam Zheng int chunk_sectors = s->granularity >> BDRV_SECTOR_BITS; 184e5b43573SFam Zheng int64_t align_sector_num = *sector_num; 185e5b43573SFam Zheng int align_nb_sectors = *nb_sectors; 186e5b43573SFam Zheng int max_sectors = chunk_sectors * s->max_iov; 187893f7ebaSPaolo Bonzini 188e5b43573SFam Zheng need_cow = !test_bit(*sector_num / chunk_sectors, s->cow_bitmap); 189e5b43573SFam Zheng need_cow |= !test_bit((*sector_num + *nb_sectors - 1) / chunk_sectors, 190e5b43573SFam Zheng s->cow_bitmap); 191e5b43573SFam Zheng if (need_cow) { 192244483e6SKevin Wolf bdrv_round_sectors_to_clusters(blk_bs(s->target), *sector_num, 193244483e6SKevin Wolf *nb_sectors, &align_sector_num, 194244483e6SKevin Wolf &align_nb_sectors); 1958f0720ecSPaolo Bonzini } 1968f0720ecSPaolo Bonzini 197e5b43573SFam Zheng if (align_nb_sectors > max_sectors) { 198e5b43573SFam Zheng align_nb_sectors = max_sectors; 199e5b43573SFam Zheng if (need_cow) { 200e5b43573SFam Zheng align_nb_sectors = QEMU_ALIGN_DOWN(align_nb_sectors, 201e5b43573SFam Zheng s->target_cluster_sectors); 202e5b43573SFam Zheng } 203e5b43573SFam Zheng } 2044150ae60SFam Zheng /* Clipping may result in align_nb_sectors unaligned to chunk boundary, but 2054150ae60SFam Zheng * that doesn't matter because it's already the end of source image. */ 2064150ae60SFam Zheng mirror_clip_sectors(s, align_sector_num, &align_nb_sectors); 207402a4741SPaolo Bonzini 208e5b43573SFam Zheng ret = align_sector_num + align_nb_sectors - (*sector_num + *nb_sectors); 209e5b43573SFam Zheng *sector_num = align_sector_num; 210e5b43573SFam Zheng *nb_sectors = align_nb_sectors; 211e5b43573SFam Zheng assert(ret >= 0); 212e5b43573SFam Zheng return ret; 213e5b43573SFam Zheng } 214e5b43573SFam Zheng 21521cd917fSFam Zheng static inline void mirror_wait_for_io(MirrorBlockJob *s) 21621cd917fSFam Zheng { 21721cd917fSFam Zheng assert(!s->waiting_for_io); 21821cd917fSFam Zheng s->waiting_for_io = true; 21921cd917fSFam Zheng qemu_coroutine_yield(); 22021cd917fSFam Zheng s->waiting_for_io = false; 22121cd917fSFam Zheng } 22221cd917fSFam Zheng 223e5b43573SFam Zheng /* Submit async read while handling COW. 22417612955SJohn Snow * Returns: The number of sectors copied after and including sector_num, 22517612955SJohn Snow * excluding any sectors copied prior to sector_num due to alignment. 22617612955SJohn Snow * This will be nb_sectors if no alignment is necessary, or 227e5b43573SFam Zheng * (new_end - sector_num) if tail is rounded up or down due to 228e5b43573SFam Zheng * alignment or buffer limit. 229402a4741SPaolo Bonzini */ 230e5b43573SFam Zheng static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num, 231e5b43573SFam Zheng int nb_sectors) 232e5b43573SFam Zheng { 233e253f4b8SKevin Wolf BlockBackend *source = s->common.blk; 234e5b43573SFam Zheng int sectors_per_chunk, nb_chunks; 23517612955SJohn Snow int ret; 236e5b43573SFam Zheng MirrorOp *op; 237e4808881SJohn Snow int max_sectors; 238402a4741SPaolo Bonzini 239e5b43573SFam Zheng sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 240e4808881SJohn Snow max_sectors = sectors_per_chunk * s->max_iov; 241e5b43573SFam Zheng 242e5b43573SFam Zheng /* We can only handle as much as buf_size at a time. */ 243e5b43573SFam Zheng nb_sectors = MIN(s->buf_size >> BDRV_SECTOR_BITS, nb_sectors); 244e4808881SJohn Snow nb_sectors = MIN(max_sectors, nb_sectors); 245e5b43573SFam Zheng assert(nb_sectors); 24617612955SJohn Snow ret = nb_sectors; 247e5b43573SFam Zheng 248e5b43573SFam Zheng if (s->cow_bitmap) { 249e5b43573SFam Zheng ret += mirror_cow_align(s, §or_num, &nb_sectors); 250e5b43573SFam Zheng } 251e5b43573SFam Zheng assert(nb_sectors << BDRV_SECTOR_BITS <= s->buf_size); 252e5b43573SFam Zheng /* The sector range must meet granularity because: 253e5b43573SFam Zheng * 1) Caller passes in aligned values; 254e5b43573SFam Zheng * 2) mirror_cow_align is used only when target cluster is larger. */ 255e5b43573SFam Zheng assert(!(sector_num % sectors_per_chunk)); 2564150ae60SFam Zheng nb_chunks = DIV_ROUND_UP(nb_sectors, sectors_per_chunk); 257e5b43573SFam Zheng 258e5b43573SFam Zheng while (s->buf_free_count < nb_chunks) { 259402a4741SPaolo Bonzini trace_mirror_yield_in_flight(s, sector_num, s->in_flight); 26021cd917fSFam Zheng mirror_wait_for_io(s); 261b812f671SPaolo Bonzini } 262b812f671SPaolo Bonzini 263bd48bde8SPaolo Bonzini /* Allocate a MirrorOp that is used as an AIO callback. */ 264c84b3192SPaolo Bonzini op = g_new(MirrorOp, 1); 265bd48bde8SPaolo Bonzini op->s = s; 266bd48bde8SPaolo Bonzini op->sector_num = sector_num; 267bd48bde8SPaolo Bonzini op->nb_sectors = nb_sectors; 268402a4741SPaolo Bonzini 269402a4741SPaolo Bonzini /* Now make a QEMUIOVector taking enough granularity-sized chunks 270402a4741SPaolo Bonzini * from s->buf_free. 271402a4741SPaolo Bonzini */ 272402a4741SPaolo Bonzini qemu_iovec_init(&op->qiov, nb_chunks); 273402a4741SPaolo Bonzini while (nb_chunks-- > 0) { 274402a4741SPaolo Bonzini MirrorBuffer *buf = QSIMPLEQ_FIRST(&s->buf_free); 275e5b43573SFam Zheng size_t remaining = nb_sectors * BDRV_SECTOR_SIZE - op->qiov.size; 2765a0f6fd5SKevin Wolf 277402a4741SPaolo Bonzini QSIMPLEQ_REMOVE_HEAD(&s->buf_free, next); 278402a4741SPaolo Bonzini s->buf_free_count--; 2795a0f6fd5SKevin Wolf qemu_iovec_add(&op->qiov, buf, MIN(s->granularity, remaining)); 280402a4741SPaolo Bonzini } 281402a4741SPaolo Bonzini 282893f7ebaSPaolo Bonzini /* Copy the dirty cluster. */ 283bd48bde8SPaolo Bonzini s->in_flight++; 284b21c7652SMax Reitz s->sectors_in_flight += nb_sectors; 285b812f671SPaolo Bonzini trace_mirror_one_iteration(s, sector_num, nb_sectors); 286dcfb3bebSFam Zheng 28773698c30SEric Blake blk_aio_preadv(source, sector_num * BDRV_SECTOR_SIZE, &op->qiov, 0, 288bd48bde8SPaolo Bonzini mirror_read_complete, op); 289e5b43573SFam Zheng return ret; 290e5b43573SFam Zheng } 291e5b43573SFam Zheng 292e5b43573SFam Zheng static void mirror_do_zero_or_discard(MirrorBlockJob *s, 293e5b43573SFam Zheng int64_t sector_num, 294e5b43573SFam Zheng int nb_sectors, 295e5b43573SFam Zheng bool is_discard) 296e5b43573SFam Zheng { 297e5b43573SFam Zheng MirrorOp *op; 298e5b43573SFam Zheng 299e5b43573SFam Zheng /* Allocate a MirrorOp that is used as an AIO callback. The qiov is zeroed 300e5b43573SFam Zheng * so the freeing in mirror_iteration_done is nop. */ 301e5b43573SFam Zheng op = g_new0(MirrorOp, 1); 302e5b43573SFam Zheng op->s = s; 303e5b43573SFam Zheng op->sector_num = sector_num; 304e5b43573SFam Zheng op->nb_sectors = nb_sectors; 305e5b43573SFam Zheng 306e5b43573SFam Zheng s->in_flight++; 307e5b43573SFam Zheng s->sectors_in_flight += nb_sectors; 308e5b43573SFam Zheng if (is_discard) { 3091c6c4bb7SEric Blake blk_aio_pdiscard(s->target, sector_num << BDRV_SECTOR_BITS, 3101c6c4bb7SEric Blake op->nb_sectors << BDRV_SECTOR_BITS, 311e5b43573SFam Zheng mirror_write_complete, op); 312e5b43573SFam Zheng } else { 313e253f4b8SKevin Wolf blk_aio_pwrite_zeroes(s->target, sector_num * BDRV_SECTOR_SIZE, 314e253f4b8SKevin Wolf op->nb_sectors * BDRV_SECTOR_SIZE, 315dcfb3bebSFam Zheng s->unmap ? BDRV_REQ_MAY_UNMAP : 0, 316dcfb3bebSFam Zheng mirror_write_complete, op); 317e5b43573SFam Zheng } 318e5b43573SFam Zheng } 319e5b43573SFam Zheng 320e5b43573SFam Zheng static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) 321e5b43573SFam Zheng { 322e253f4b8SKevin Wolf BlockDriverState *source = blk_bs(s->common.blk); 3239c83625bSMax Reitz int64_t sector_num, first_chunk; 324e5b43573SFam Zheng uint64_t delay_ns = 0; 325e5b43573SFam Zheng /* At least the first dirty chunk is mirrored in one iteration. */ 326e5b43573SFam Zheng int nb_chunks = 1; 327e5b43573SFam Zheng int64_t end = s->bdev_length / BDRV_SECTOR_SIZE; 328e5b43573SFam Zheng int sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 3294b5004d9SDenis V. Lunev bool write_zeroes_ok = bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)); 3300965a41eSVladimir Sementsov-Ogievskiy int max_io_sectors = MAX((s->buf_size >> BDRV_SECTOR_BITS) / MAX_IN_FLIGHT, 3310965a41eSVladimir Sementsov-Ogievskiy MAX_IO_SECTORS); 332e5b43573SFam Zheng 333dc162c8eSFam Zheng sector_num = bdrv_dirty_iter_next(s->dbi); 334e5b43573SFam Zheng if (sector_num < 0) { 335dc162c8eSFam Zheng bdrv_set_dirty_iter(s->dbi, 0); 336dc162c8eSFam Zheng sector_num = bdrv_dirty_iter_next(s->dbi); 337e5b43573SFam Zheng trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap)); 338e5b43573SFam Zheng assert(sector_num >= 0); 339e5b43573SFam Zheng } 340e5b43573SFam Zheng 3419c83625bSMax Reitz first_chunk = sector_num / sectors_per_chunk; 3429c83625bSMax Reitz while (test_bit(first_chunk, s->in_flight_bitmap)) { 343ff04198bSDenis V. Lunev trace_mirror_yield_in_flight(s, sector_num, s->in_flight); 3449c83625bSMax Reitz mirror_wait_for_io(s); 3459c83625bSMax Reitz } 3469c83625bSMax Reitz 347565ac01fSStefan Hajnoczi block_job_pause_point(&s->common); 348565ac01fSStefan Hajnoczi 349e5b43573SFam Zheng /* Find the number of consective dirty chunks following the first dirty 350e5b43573SFam Zheng * one, and wait for in flight requests in them. */ 351e5b43573SFam Zheng while (nb_chunks * sectors_per_chunk < (s->buf_size >> BDRV_SECTOR_BITS)) { 352dc162c8eSFam Zheng int64_t next_dirty; 353e5b43573SFam Zheng int64_t next_sector = sector_num + nb_chunks * sectors_per_chunk; 354e5b43573SFam Zheng int64_t next_chunk = next_sector / sectors_per_chunk; 355e5b43573SFam Zheng if (next_sector >= end || 356e5b43573SFam Zheng !bdrv_get_dirty(source, s->dirty_bitmap, next_sector)) { 357e5b43573SFam Zheng break; 358e5b43573SFam Zheng } 359e5b43573SFam Zheng if (test_bit(next_chunk, s->in_flight_bitmap)) { 360e5b43573SFam Zheng break; 361e5b43573SFam Zheng } 3629c83625bSMax Reitz 363dc162c8eSFam Zheng next_dirty = bdrv_dirty_iter_next(s->dbi); 364dc162c8eSFam Zheng if (next_dirty > next_sector || next_dirty < 0) { 365f27a2742SMax Reitz /* The bitmap iterator's cache is stale, refresh it */ 366dc162c8eSFam Zheng bdrv_set_dirty_iter(s->dbi, next_sector); 367dc162c8eSFam Zheng next_dirty = bdrv_dirty_iter_next(s->dbi); 368f27a2742SMax Reitz } 369dc162c8eSFam Zheng assert(next_dirty == next_sector); 370e5b43573SFam Zheng nb_chunks++; 371e5b43573SFam Zheng } 372e5b43573SFam Zheng 373e5b43573SFam Zheng /* Clear dirty bits before querying the block status, because 374e5b43573SFam Zheng * calling bdrv_get_block_status_above could yield - if some blocks are 375e5b43573SFam Zheng * marked dirty in this window, we need to know. 376e5b43573SFam Zheng */ 377e5b43573SFam Zheng bdrv_reset_dirty_bitmap(s->dirty_bitmap, sector_num, 378e5b43573SFam Zheng nb_chunks * sectors_per_chunk); 379e5b43573SFam Zheng bitmap_set(s->in_flight_bitmap, sector_num / sectors_per_chunk, nb_chunks); 380e5b43573SFam Zheng while (nb_chunks > 0 && sector_num < end) { 381e5b43573SFam Zheng int ret; 3824b5004d9SDenis V. Lunev int io_sectors, io_sectors_acct; 383e5b43573SFam Zheng BlockDriverState *file; 384e5b43573SFam Zheng enum MirrorMethod { 385e5b43573SFam Zheng MIRROR_METHOD_COPY, 386e5b43573SFam Zheng MIRROR_METHOD_ZERO, 387e5b43573SFam Zheng MIRROR_METHOD_DISCARD 388e5b43573SFam Zheng } mirror_method = MIRROR_METHOD_COPY; 389e5b43573SFam Zheng 390e5b43573SFam Zheng assert(!(sector_num % sectors_per_chunk)); 391e5b43573SFam Zheng ret = bdrv_get_block_status_above(source, NULL, sector_num, 392e5b43573SFam Zheng nb_chunks * sectors_per_chunk, 393e5b43573SFam Zheng &io_sectors, &file); 394e5b43573SFam Zheng if (ret < 0) { 3950965a41eSVladimir Sementsov-Ogievskiy io_sectors = MIN(nb_chunks * sectors_per_chunk, max_io_sectors); 3960965a41eSVladimir Sementsov-Ogievskiy } else if (ret & BDRV_BLOCK_DATA) { 3970965a41eSVladimir Sementsov-Ogievskiy io_sectors = MIN(io_sectors, max_io_sectors); 398e5b43573SFam Zheng } 399e5b43573SFam Zheng 400e5b43573SFam Zheng io_sectors -= io_sectors % sectors_per_chunk; 401e5b43573SFam Zheng if (io_sectors < sectors_per_chunk) { 402e5b43573SFam Zheng io_sectors = sectors_per_chunk; 403e5b43573SFam Zheng } else if (ret >= 0 && !(ret & BDRV_BLOCK_DATA)) { 404e5b43573SFam Zheng int64_t target_sector_num; 405e5b43573SFam Zheng int target_nb_sectors; 406244483e6SKevin Wolf bdrv_round_sectors_to_clusters(blk_bs(s->target), sector_num, 407244483e6SKevin Wolf io_sectors, &target_sector_num, 408244483e6SKevin Wolf &target_nb_sectors); 409e5b43573SFam Zheng if (target_sector_num == sector_num && 410e5b43573SFam Zheng target_nb_sectors == io_sectors) { 411e5b43573SFam Zheng mirror_method = ret & BDRV_BLOCK_ZERO ? 412e5b43573SFam Zheng MIRROR_METHOD_ZERO : 413e5b43573SFam Zheng MIRROR_METHOD_DISCARD; 414e5b43573SFam Zheng } 415e5b43573SFam Zheng } 416e5b43573SFam Zheng 417cf56a3c6SDenis V. Lunev while (s->in_flight >= MAX_IN_FLIGHT) { 418cf56a3c6SDenis V. Lunev trace_mirror_yield_in_flight(s, sector_num, s->in_flight); 419cf56a3c6SDenis V. Lunev mirror_wait_for_io(s); 420cf56a3c6SDenis V. Lunev } 421cf56a3c6SDenis V. Lunev 422dbaa7b57SVladimir Sementsov-Ogievskiy if (s->ret < 0) { 423dbaa7b57SVladimir Sementsov-Ogievskiy return 0; 424dbaa7b57SVladimir Sementsov-Ogievskiy } 425dbaa7b57SVladimir Sementsov-Ogievskiy 4264150ae60SFam Zheng mirror_clip_sectors(s, sector_num, &io_sectors); 427e5b43573SFam Zheng switch (mirror_method) { 428e5b43573SFam Zheng case MIRROR_METHOD_COPY: 429e5b43573SFam Zheng io_sectors = mirror_do_read(s, sector_num, io_sectors); 4304b5004d9SDenis V. Lunev io_sectors_acct = io_sectors; 431e5b43573SFam Zheng break; 432e5b43573SFam Zheng case MIRROR_METHOD_ZERO: 433e5b43573SFam Zheng case MIRROR_METHOD_DISCARD: 4344b5004d9SDenis V. Lunev mirror_do_zero_or_discard(s, sector_num, io_sectors, 4354b5004d9SDenis V. Lunev mirror_method == MIRROR_METHOD_DISCARD); 4364b5004d9SDenis V. Lunev if (write_zeroes_ok) { 4374b5004d9SDenis V. Lunev io_sectors_acct = 0; 4384b5004d9SDenis V. Lunev } else { 4394b5004d9SDenis V. Lunev io_sectors_acct = io_sectors; 4404b5004d9SDenis V. Lunev } 441e5b43573SFam Zheng break; 442e5b43573SFam Zheng default: 443e5b43573SFam Zheng abort(); 444e5b43573SFam Zheng } 445e5b43573SFam Zheng assert(io_sectors); 446e5b43573SFam Zheng sector_num += io_sectors; 4474150ae60SFam Zheng nb_chunks -= DIV_ROUND_UP(io_sectors, sectors_per_chunk); 448f14a39ccSSascha Silbe if (s->common.speed) { 4494b5004d9SDenis V. Lunev delay_ns = ratelimit_calculate_delay(&s->limit, io_sectors_acct); 450f14a39ccSSascha Silbe } 451dcfb3bebSFam Zheng } 452cc8c9d6cSPaolo Bonzini return delay_ns; 453893f7ebaSPaolo Bonzini } 454b952b558SPaolo Bonzini 455402a4741SPaolo Bonzini static void mirror_free_init(MirrorBlockJob *s) 456402a4741SPaolo Bonzini { 457402a4741SPaolo Bonzini int granularity = s->granularity; 458402a4741SPaolo Bonzini size_t buf_size = s->buf_size; 459402a4741SPaolo Bonzini uint8_t *buf = s->buf; 460402a4741SPaolo Bonzini 461402a4741SPaolo Bonzini assert(s->buf_free_count == 0); 462402a4741SPaolo Bonzini QSIMPLEQ_INIT(&s->buf_free); 463402a4741SPaolo Bonzini while (buf_size != 0) { 464402a4741SPaolo Bonzini MirrorBuffer *cur = (MirrorBuffer *)buf; 465402a4741SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&s->buf_free, cur, next); 466402a4741SPaolo Bonzini s->buf_free_count++; 467402a4741SPaolo Bonzini buf_size -= granularity; 468402a4741SPaolo Bonzini buf += granularity; 469402a4741SPaolo Bonzini } 470402a4741SPaolo Bonzini } 471402a4741SPaolo Bonzini 472bae8196dSPaolo Bonzini /* This is also used for the .pause callback. There is no matching 473bae8196dSPaolo Bonzini * mirror_resume() because mirror_run() will begin iterating again 474bae8196dSPaolo Bonzini * when the job is resumed. 475bae8196dSPaolo Bonzini */ 476bae8196dSPaolo Bonzini static void mirror_wait_for_all_io(MirrorBlockJob *s) 477bd48bde8SPaolo Bonzini { 478bd48bde8SPaolo Bonzini while (s->in_flight > 0) { 47921cd917fSFam Zheng mirror_wait_for_io(s); 480bd48bde8SPaolo Bonzini } 481893f7ebaSPaolo Bonzini } 482893f7ebaSPaolo Bonzini 4835a7e7a0bSStefan Hajnoczi typedef struct { 4845a7e7a0bSStefan Hajnoczi int ret; 4855a7e7a0bSStefan Hajnoczi } MirrorExitData; 4865a7e7a0bSStefan Hajnoczi 4875a7e7a0bSStefan Hajnoczi static void mirror_exit(BlockJob *job, void *opaque) 4885a7e7a0bSStefan Hajnoczi { 4895a7e7a0bSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 4905a7e7a0bSStefan Hajnoczi MirrorExitData *data = opaque; 4915a7e7a0bSStefan Hajnoczi AioContext *replace_aio_context = NULL; 492e253f4b8SKevin Wolf BlockDriverState *src = blk_bs(s->common.blk); 493e253f4b8SKevin Wolf BlockDriverState *target_bs = blk_bs(s->target); 4943f09bfbcSKevin Wolf 4953f09bfbcSKevin Wolf /* Make sure that the source BDS doesn't go away before we called 4963f09bfbcSKevin Wolf * block_job_completed(). */ 4973f09bfbcSKevin Wolf bdrv_ref(src); 4985a7e7a0bSStefan Hajnoczi 4995a7e7a0bSStefan Hajnoczi if (s->to_replace) { 5005a7e7a0bSStefan Hajnoczi replace_aio_context = bdrv_get_aio_context(s->to_replace); 5015a7e7a0bSStefan Hajnoczi aio_context_acquire(replace_aio_context); 5025a7e7a0bSStefan Hajnoczi } 5035a7e7a0bSStefan Hajnoczi 5045a7e7a0bSStefan Hajnoczi if (s->should_complete && data->ret == 0) { 505e253f4b8SKevin Wolf BlockDriverState *to_replace = src; 5065a7e7a0bSStefan Hajnoczi if (s->to_replace) { 5075a7e7a0bSStefan Hajnoczi to_replace = s->to_replace; 5085a7e7a0bSStefan Hajnoczi } 50940365552SKevin Wolf 510e253f4b8SKevin Wolf if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) { 511e253f4b8SKevin Wolf bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL); 5125a7e7a0bSStefan Hajnoczi } 513b8804815SKevin Wolf 514b8804815SKevin Wolf /* The mirror job has no requests in flight any more, but we need to 515b8804815SKevin Wolf * drain potential other users of the BDS before changing the graph. */ 516e253f4b8SKevin Wolf bdrv_drained_begin(target_bs); 517e253f4b8SKevin Wolf bdrv_replace_in_backing_chain(to_replace, target_bs); 518e253f4b8SKevin Wolf bdrv_drained_end(target_bs); 519b8804815SKevin Wolf 520b6d2e599SKevin Wolf /* We just changed the BDS the job BB refers to */ 521b6d2e599SKevin Wolf blk_remove_bs(job->blk); 522b6d2e599SKevin Wolf blk_insert_bs(job->blk, src); 5235a7e7a0bSStefan Hajnoczi } 5245a7e7a0bSStefan Hajnoczi if (s->to_replace) { 5255a7e7a0bSStefan Hajnoczi bdrv_op_unblock_all(s->to_replace, s->replace_blocker); 5265a7e7a0bSStefan Hajnoczi error_free(s->replace_blocker); 5275a7e7a0bSStefan Hajnoczi bdrv_unref(s->to_replace); 5285a7e7a0bSStefan Hajnoczi } 5295a7e7a0bSStefan Hajnoczi if (replace_aio_context) { 5305a7e7a0bSStefan Hajnoczi aio_context_release(replace_aio_context); 5315a7e7a0bSStefan Hajnoczi } 5325a7e7a0bSStefan Hajnoczi g_free(s->replaces); 533e253f4b8SKevin Wolf blk_unref(s->target); 534bae8196dSPaolo Bonzini s->target = NULL; 5355a7e7a0bSStefan Hajnoczi block_job_completed(&s->common, data->ret); 5365a7e7a0bSStefan Hajnoczi g_free(data); 537176c3699SFam Zheng bdrv_drained_end(src); 5383f09bfbcSKevin Wolf bdrv_unref(src); 5395a7e7a0bSStefan Hajnoczi } 5405a7e7a0bSStefan Hajnoczi 54149efb1f5SDenis V. Lunev static void mirror_throttle(MirrorBlockJob *s) 54249efb1f5SDenis V. Lunev { 54349efb1f5SDenis V. Lunev int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 54449efb1f5SDenis V. Lunev 54549efb1f5SDenis V. Lunev if (now - s->last_pause_ns > SLICE_TIME) { 54649efb1f5SDenis V. Lunev s->last_pause_ns = now; 54749efb1f5SDenis V. Lunev block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, 0); 54849efb1f5SDenis V. Lunev } else { 54949efb1f5SDenis V. Lunev block_job_pause_point(&s->common); 55049efb1f5SDenis V. Lunev } 55149efb1f5SDenis V. Lunev } 55249efb1f5SDenis V. Lunev 553c0b363adSDenis V. Lunev static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s) 554c0b363adSDenis V. Lunev { 555c0b363adSDenis V. Lunev int64_t sector_num, end; 556c0b363adSDenis V. Lunev BlockDriverState *base = s->base; 557c0b363adSDenis V. Lunev BlockDriverState *bs = blk_bs(s->common.blk); 558c0b363adSDenis V. Lunev BlockDriverState *target_bs = blk_bs(s->target); 559c0b363adSDenis V. Lunev int ret, n; 560c0b363adSDenis V. Lunev 561c0b363adSDenis V. Lunev end = s->bdev_length / BDRV_SECTOR_SIZE; 562c0b363adSDenis V. Lunev 563b7d5062cSDenis V. Lunev if (base == NULL && !bdrv_has_zero_init(target_bs)) { 564c7c2769cSDenis V. Lunev if (!bdrv_can_write_zeroes_with_unmap(target_bs)) { 565b7d5062cSDenis V. Lunev bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, end); 566b7d5062cSDenis V. Lunev return 0; 567b7d5062cSDenis V. Lunev } 568b7d5062cSDenis V. Lunev 569c7c2769cSDenis V. Lunev for (sector_num = 0; sector_num < end; ) { 570c7c2769cSDenis V. Lunev int nb_sectors = MIN(end - sector_num, 571c7c2769cSDenis V. Lunev QEMU_ALIGN_DOWN(INT_MAX, s->granularity) >> BDRV_SECTOR_BITS); 572c7c2769cSDenis V. Lunev 573c7c2769cSDenis V. Lunev mirror_throttle(s); 574c7c2769cSDenis V. Lunev 575c7c2769cSDenis V. Lunev if (block_job_is_cancelled(&s->common)) { 576c7c2769cSDenis V. Lunev return 0; 577c7c2769cSDenis V. Lunev } 578c7c2769cSDenis V. Lunev 579c7c2769cSDenis V. Lunev if (s->in_flight >= MAX_IN_FLIGHT) { 580c7c2769cSDenis V. Lunev trace_mirror_yield(s, s->in_flight, s->buf_free_count, -1); 581c7c2769cSDenis V. Lunev mirror_wait_for_io(s); 582c7c2769cSDenis V. Lunev continue; 583c7c2769cSDenis V. Lunev } 584c7c2769cSDenis V. Lunev 585c7c2769cSDenis V. Lunev mirror_do_zero_or_discard(s, sector_num, nb_sectors, false); 586c7c2769cSDenis V. Lunev sector_num += nb_sectors; 587c7c2769cSDenis V. Lunev } 588c7c2769cSDenis V. Lunev 589bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 590c7c2769cSDenis V. Lunev } 591c7c2769cSDenis V. Lunev 592c0b363adSDenis V. Lunev /* First part, loop on the sectors and initialize the dirty bitmap. */ 593c0b363adSDenis V. Lunev for (sector_num = 0; sector_num < end; ) { 594c0b363adSDenis V. Lunev /* Just to make sure we are not exceeding int limit. */ 595c0b363adSDenis V. Lunev int nb_sectors = MIN(INT_MAX >> BDRV_SECTOR_BITS, 596c0b363adSDenis V. Lunev end - sector_num); 597c0b363adSDenis V. Lunev 598c0b363adSDenis V. Lunev mirror_throttle(s); 599c0b363adSDenis V. Lunev 600c0b363adSDenis V. Lunev if (block_job_is_cancelled(&s->common)) { 601c0b363adSDenis V. Lunev return 0; 602c0b363adSDenis V. Lunev } 603c0b363adSDenis V. Lunev 604c0b363adSDenis V. Lunev ret = bdrv_is_allocated_above(bs, base, sector_num, nb_sectors, &n); 605c0b363adSDenis V. Lunev if (ret < 0) { 606c0b363adSDenis V. Lunev return ret; 607c0b363adSDenis V. Lunev } 608c0b363adSDenis V. Lunev 609c0b363adSDenis V. Lunev assert(n > 0); 610b7d5062cSDenis V. Lunev if (ret == 1) { 611c0b363adSDenis V. Lunev bdrv_set_dirty_bitmap(s->dirty_bitmap, sector_num, n); 612c0b363adSDenis V. Lunev } 613c0b363adSDenis V. Lunev sector_num += n; 614c0b363adSDenis V. Lunev } 615c0b363adSDenis V. Lunev return 0; 616c0b363adSDenis V. Lunev } 617c0b363adSDenis V. Lunev 618893f7ebaSPaolo Bonzini static void coroutine_fn mirror_run(void *opaque) 619893f7ebaSPaolo Bonzini { 620893f7ebaSPaolo Bonzini MirrorBlockJob *s = opaque; 6215a7e7a0bSStefan Hajnoczi MirrorExitData *data; 622e253f4b8SKevin Wolf BlockDriverState *bs = blk_bs(s->common.blk); 623e253f4b8SKevin Wolf BlockDriverState *target_bs = blk_bs(s->target); 6249a0cec66SPaolo Bonzini bool need_drain = true; 625c0b363adSDenis V. Lunev int64_t length; 626b812f671SPaolo Bonzini BlockDriverInfo bdi; 6271d33936eSJeff Cody char backing_filename[2]; /* we only need 2 characters because we are only 6281d33936eSJeff Cody checking for a NULL string */ 629893f7ebaSPaolo Bonzini int ret = 0; 630e5b43573SFam Zheng int target_cluster_size = BDRV_SECTOR_SIZE; 631893f7ebaSPaolo Bonzini 632893f7ebaSPaolo Bonzini if (block_job_is_cancelled(&s->common)) { 633893f7ebaSPaolo Bonzini goto immediate_exit; 634893f7ebaSPaolo Bonzini } 635893f7ebaSPaolo Bonzini 636b21c7652SMax Reitz s->bdev_length = bdrv_getlength(bs); 637b21c7652SMax Reitz if (s->bdev_length < 0) { 638b21c7652SMax Reitz ret = s->bdev_length; 639373df5b1SFam Zheng goto immediate_exit; 640b21c7652SMax Reitz } else if (s->bdev_length == 0) { 6419e48b025SFam Zheng /* Report BLOCK_JOB_READY and wait for complete. */ 6429e48b025SFam Zheng block_job_event_ready(&s->common); 6439e48b025SFam Zheng s->synced = true; 6449e48b025SFam Zheng while (!block_job_is_cancelled(&s->common) && !s->should_complete) { 6459e48b025SFam Zheng block_job_yield(&s->common); 6469e48b025SFam Zheng } 6479e48b025SFam Zheng s->common.cancelled = false; 6489e48b025SFam Zheng goto immediate_exit; 649893f7ebaSPaolo Bonzini } 650893f7ebaSPaolo Bonzini 651b21c7652SMax Reitz length = DIV_ROUND_UP(s->bdev_length, s->granularity); 652402a4741SPaolo Bonzini s->in_flight_bitmap = bitmap_new(length); 653402a4741SPaolo Bonzini 654b812f671SPaolo Bonzini /* If we have no backing file yet in the destination, we cannot let 655b812f671SPaolo Bonzini * the destination do COW. Instead, we copy sectors around the 656b812f671SPaolo Bonzini * dirty data if needed. We need a bitmap to do that. 657b812f671SPaolo Bonzini */ 658e253f4b8SKevin Wolf bdrv_get_backing_filename(target_bs, backing_filename, 659b812f671SPaolo Bonzini sizeof(backing_filename)); 660e253f4b8SKevin Wolf if (!bdrv_get_info(target_bs, &bdi) && bdi.cluster_size) { 661e5b43573SFam Zheng target_cluster_size = bdi.cluster_size; 662c3cc95bdSFam Zheng } 663e253f4b8SKevin Wolf if (backing_filename[0] && !target_bs->backing 664e5b43573SFam Zheng && s->granularity < target_cluster_size) { 665e5b43573SFam Zheng s->buf_size = MAX(s->buf_size, target_cluster_size); 666b812f671SPaolo Bonzini s->cow_bitmap = bitmap_new(length); 667b812f671SPaolo Bonzini } 668e5b43573SFam Zheng s->target_cluster_sectors = target_cluster_size >> BDRV_SECTOR_BITS; 669e253f4b8SKevin Wolf s->max_iov = MIN(bs->bl.max_iov, target_bs->bl.max_iov); 670b812f671SPaolo Bonzini 6717504edf4SKevin Wolf s->buf = qemu_try_blockalign(bs, s->buf_size); 6727504edf4SKevin Wolf if (s->buf == NULL) { 6737504edf4SKevin Wolf ret = -ENOMEM; 6747504edf4SKevin Wolf goto immediate_exit; 6757504edf4SKevin Wolf } 6767504edf4SKevin Wolf 677402a4741SPaolo Bonzini mirror_free_init(s); 678893f7ebaSPaolo Bonzini 67949efb1f5SDenis V. Lunev s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 68003544a6eSFam Zheng if (!s->is_none_mode) { 681c0b363adSDenis V. Lunev ret = mirror_dirty_init(s); 682c0b363adSDenis V. Lunev if (ret < 0 || block_job_is_cancelled(&s->common)) { 6834c0cbd6fSFam Zheng goto immediate_exit; 6844c0cbd6fSFam Zheng } 685893f7ebaSPaolo Bonzini } 686893f7ebaSPaolo Bonzini 687dc162c8eSFam Zheng assert(!s->dbi); 688dc162c8eSFam Zheng s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap, 0); 689893f7ebaSPaolo Bonzini for (;;) { 690cc8c9d6cSPaolo Bonzini uint64_t delay_ns = 0; 69149efb1f5SDenis V. Lunev int64_t cnt, delta; 692893f7ebaSPaolo Bonzini bool should_complete; 693893f7ebaSPaolo Bonzini 694bd48bde8SPaolo Bonzini if (s->ret < 0) { 695bd48bde8SPaolo Bonzini ret = s->ret; 696893f7ebaSPaolo Bonzini goto immediate_exit; 697893f7ebaSPaolo Bonzini } 698bd48bde8SPaolo Bonzini 699565ac01fSStefan Hajnoczi block_job_pause_point(&s->common); 700565ac01fSStefan Hajnoczi 70120dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 702b21c7652SMax Reitz /* s->common.offset contains the number of bytes already processed so 703b21c7652SMax Reitz * far, cnt is the number of dirty sectors remaining and 704b21c7652SMax Reitz * s->sectors_in_flight is the number of sectors currently being 705b21c7652SMax Reitz * processed; together those are the current total operation length */ 706b21c7652SMax Reitz s->common.len = s->common.offset + 707b21c7652SMax Reitz (cnt + s->sectors_in_flight) * BDRV_SECTOR_SIZE; 708bd48bde8SPaolo Bonzini 709bd48bde8SPaolo Bonzini /* Note that even when no rate limit is applied we need to yield 710a7282330SFam Zheng * periodically with no pending I/O so that bdrv_drain_all() returns. 711bd48bde8SPaolo Bonzini * We do so every SLICE_TIME nanoseconds, or when there is an error, 712bd48bde8SPaolo Bonzini * or when the source is clean, whichever comes first. 713bd48bde8SPaolo Bonzini */ 71449efb1f5SDenis V. Lunev delta = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->last_pause_ns; 71549efb1f5SDenis V. Lunev if (delta < SLICE_TIME && 716bd48bde8SPaolo Bonzini s->common.iostatus == BLOCK_DEVICE_IO_STATUS_OK) { 717cf56a3c6SDenis V. Lunev if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 || 718402a4741SPaolo Bonzini (cnt == 0 && s->in_flight > 0)) { 719402a4741SPaolo Bonzini trace_mirror_yield(s, s->in_flight, s->buf_free_count, cnt); 72021cd917fSFam Zheng mirror_wait_for_io(s); 721bd48bde8SPaolo Bonzini continue; 722bd48bde8SPaolo Bonzini } else if (cnt != 0) { 723cc8c9d6cSPaolo Bonzini delay_ns = mirror_iteration(s); 724893f7ebaSPaolo Bonzini } 725cc8c9d6cSPaolo Bonzini } 726893f7ebaSPaolo Bonzini 727893f7ebaSPaolo Bonzini should_complete = false; 728bd48bde8SPaolo Bonzini if (s->in_flight == 0 && cnt == 0) { 729893f7ebaSPaolo Bonzini trace_mirror_before_flush(s); 730e253f4b8SKevin Wolf ret = blk_flush(s->target); 731893f7ebaSPaolo Bonzini if (ret < 0) { 732a589569fSWenchao Xia if (mirror_error_action(s, false, -ret) == 733a589569fSWenchao Xia BLOCK_ERROR_ACTION_REPORT) { 734893f7ebaSPaolo Bonzini goto immediate_exit; 735893f7ebaSPaolo Bonzini } 736b952b558SPaolo Bonzini } else { 737893f7ebaSPaolo Bonzini /* We're out of the streaming phase. From now on, if the job 738893f7ebaSPaolo Bonzini * is cancelled we will actually complete all pending I/O and 739893f7ebaSPaolo Bonzini * report completion. This way, block-job-cancel will leave 740893f7ebaSPaolo Bonzini * the target in a consistent state. 741893f7ebaSPaolo Bonzini */ 742d63ffd87SPaolo Bonzini if (!s->synced) { 743bcada37bSWenchao Xia block_job_event_ready(&s->common); 744d63ffd87SPaolo Bonzini s->synced = true; 745d63ffd87SPaolo Bonzini } 746d63ffd87SPaolo Bonzini 747d63ffd87SPaolo Bonzini should_complete = s->should_complete || 748d63ffd87SPaolo Bonzini block_job_is_cancelled(&s->common); 74920dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 750893f7ebaSPaolo Bonzini } 751b952b558SPaolo Bonzini } 752893f7ebaSPaolo Bonzini 753893f7ebaSPaolo Bonzini if (cnt == 0 && should_complete) { 754893f7ebaSPaolo Bonzini /* The dirty bitmap is not updated while operations are pending. 755893f7ebaSPaolo Bonzini * If we're about to exit, wait for pending operations before 756893f7ebaSPaolo Bonzini * calling bdrv_get_dirty_count(bs), or we may exit while the 757893f7ebaSPaolo Bonzini * source has dirty data to copy! 758893f7ebaSPaolo Bonzini * 759893f7ebaSPaolo Bonzini * Note that I/O can be submitted by the guest while 7609a0cec66SPaolo Bonzini * mirror_populate runs, so pause it now. Before deciding 7619a0cec66SPaolo Bonzini * whether to switch to target check one last time if I/O has 7629a0cec66SPaolo Bonzini * come in the meanwhile, and if not flush the data to disk. 763893f7ebaSPaolo Bonzini */ 764893f7ebaSPaolo Bonzini trace_mirror_before_drain(s, cnt); 7659a0cec66SPaolo Bonzini 7669a0cec66SPaolo Bonzini bdrv_drained_begin(bs); 76720dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 7689a0cec66SPaolo Bonzini if (cnt > 0) { 7699a0cec66SPaolo Bonzini bdrv_drained_end(bs); 7709a0cec66SPaolo Bonzini continue; 7719a0cec66SPaolo Bonzini } 7729a0cec66SPaolo Bonzini 7739a0cec66SPaolo Bonzini /* The two disks are in sync. Exit and report successful 7749a0cec66SPaolo Bonzini * completion. 7759a0cec66SPaolo Bonzini */ 7769a0cec66SPaolo Bonzini assert(QLIST_EMPTY(&bs->tracked_requests)); 7779a0cec66SPaolo Bonzini s->common.cancelled = false; 7789a0cec66SPaolo Bonzini need_drain = false; 7799a0cec66SPaolo Bonzini break; 780893f7ebaSPaolo Bonzini } 781893f7ebaSPaolo Bonzini 782893f7ebaSPaolo Bonzini ret = 0; 783cc8c9d6cSPaolo Bonzini trace_mirror_before_sleep(s, cnt, s->synced, delay_ns); 784d63ffd87SPaolo Bonzini if (!s->synced) { 7857483d1e5SAlex Bligh block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); 786893f7ebaSPaolo Bonzini if (block_job_is_cancelled(&s->common)) { 787893f7ebaSPaolo Bonzini break; 788893f7ebaSPaolo Bonzini } 789893f7ebaSPaolo Bonzini } else if (!should_complete) { 790bd48bde8SPaolo Bonzini delay_ns = (s->in_flight == 0 && cnt == 0 ? SLICE_TIME : 0); 7917483d1e5SAlex Bligh block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); 792893f7ebaSPaolo Bonzini } 79349efb1f5SDenis V. Lunev s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 794893f7ebaSPaolo Bonzini } 795893f7ebaSPaolo Bonzini 796893f7ebaSPaolo Bonzini immediate_exit: 797bd48bde8SPaolo Bonzini if (s->in_flight > 0) { 798bd48bde8SPaolo Bonzini /* We get here only if something went wrong. Either the job failed, 799bd48bde8SPaolo Bonzini * or it was cancelled prematurely so that we do not guarantee that 800bd48bde8SPaolo Bonzini * the target is a copy of the source. 801bd48bde8SPaolo Bonzini */ 802bd48bde8SPaolo Bonzini assert(ret < 0 || (!s->synced && block_job_is_cancelled(&s->common))); 8039a0cec66SPaolo Bonzini assert(need_drain); 804bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 805bd48bde8SPaolo Bonzini } 806bd48bde8SPaolo Bonzini 807bd48bde8SPaolo Bonzini assert(s->in_flight == 0); 8087191bf31SMarkus Armbruster qemu_vfree(s->buf); 809b812f671SPaolo Bonzini g_free(s->cow_bitmap); 810402a4741SPaolo Bonzini g_free(s->in_flight_bitmap); 811dc162c8eSFam Zheng bdrv_dirty_iter_free(s->dbi); 812e4654d2dSFam Zheng bdrv_release_dirty_bitmap(bs, s->dirty_bitmap); 8135a7e7a0bSStefan Hajnoczi 8145a7e7a0bSStefan Hajnoczi data = g_malloc(sizeof(*data)); 8155a7e7a0bSStefan Hajnoczi data->ret = ret; 8169a0cec66SPaolo Bonzini 8179a0cec66SPaolo Bonzini if (need_drain) { 818e253f4b8SKevin Wolf bdrv_drained_begin(bs); 8199a0cec66SPaolo Bonzini } 8205a7e7a0bSStefan Hajnoczi block_job_defer_to_main_loop(&s->common, mirror_exit, data); 821893f7ebaSPaolo Bonzini } 822893f7ebaSPaolo Bonzini 823893f7ebaSPaolo Bonzini static void mirror_set_speed(BlockJob *job, int64_t speed, Error **errp) 824893f7ebaSPaolo Bonzini { 825893f7ebaSPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 826893f7ebaSPaolo Bonzini 827893f7ebaSPaolo Bonzini if (speed < 0) { 828c6bd8c70SMarkus Armbruster error_setg(errp, QERR_INVALID_PARAMETER, "speed"); 829893f7ebaSPaolo Bonzini return; 830893f7ebaSPaolo Bonzini } 831893f7ebaSPaolo Bonzini ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME); 832893f7ebaSPaolo Bonzini } 833893f7ebaSPaolo Bonzini 834d63ffd87SPaolo Bonzini static void mirror_complete(BlockJob *job, Error **errp) 835d63ffd87SPaolo Bonzini { 836d63ffd87SPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 837274fcceeSMax Reitz BlockDriverState *src, *target; 838d63ffd87SPaolo Bonzini 839274fcceeSMax Reitz src = blk_bs(job->blk); 840274fcceeSMax Reitz target = blk_bs(s->target); 841274fcceeSMax Reitz 842d63ffd87SPaolo Bonzini if (!s->synced) { 8439df229c3SAlberto Garcia error_setg(errp, "The active block job '%s' cannot be completed", 8449df229c3SAlberto Garcia job->id); 845d63ffd87SPaolo Bonzini return; 846d63ffd87SPaolo Bonzini } 847d63ffd87SPaolo Bonzini 848274fcceeSMax Reitz if (s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) { 849274fcceeSMax Reitz int ret; 850274fcceeSMax Reitz 851274fcceeSMax Reitz assert(!target->backing); 852274fcceeSMax Reitz ret = bdrv_open_backing_file(target, NULL, "backing", errp); 853274fcceeSMax Reitz if (ret < 0) { 854274fcceeSMax Reitz return; 855274fcceeSMax Reitz } 856274fcceeSMax Reitz } 857274fcceeSMax Reitz 85815d67298SChanglong Xie /* block all operations on to_replace bs */ 85909158f00SBenoît Canet if (s->replaces) { 8605a7e7a0bSStefan Hajnoczi AioContext *replace_aio_context; 8615a7e7a0bSStefan Hajnoczi 862e12f3784SWen Congyang s->to_replace = bdrv_find_node(s->replaces); 86309158f00SBenoît Canet if (!s->to_replace) { 864e12f3784SWen Congyang error_setg(errp, "Node name '%s' not found", s->replaces); 86509158f00SBenoît Canet return; 86609158f00SBenoît Canet } 86709158f00SBenoît Canet 8685a7e7a0bSStefan Hajnoczi replace_aio_context = bdrv_get_aio_context(s->to_replace); 8695a7e7a0bSStefan Hajnoczi aio_context_acquire(replace_aio_context); 8705a7e7a0bSStefan Hajnoczi 87109158f00SBenoît Canet error_setg(&s->replace_blocker, 87209158f00SBenoît Canet "block device is in use by block-job-complete"); 87309158f00SBenoît Canet bdrv_op_block_all(s->to_replace, s->replace_blocker); 87409158f00SBenoît Canet bdrv_ref(s->to_replace); 8755a7e7a0bSStefan Hajnoczi 8765a7e7a0bSStefan Hajnoczi aio_context_release(replace_aio_context); 87709158f00SBenoît Canet } 87809158f00SBenoît Canet 879274fcceeSMax Reitz if (s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) { 880274fcceeSMax Reitz BlockDriverState *backing = s->is_none_mode ? src : s->base; 881274fcceeSMax Reitz if (backing_bs(target) != backing) { 882274fcceeSMax Reitz bdrv_set_backing_hd(target, backing); 883274fcceeSMax Reitz } 884274fcceeSMax Reitz } 885274fcceeSMax Reitz 886d63ffd87SPaolo Bonzini s->should_complete = true; 887751ebd76SFam Zheng block_job_enter(&s->common); 888d63ffd87SPaolo Bonzini } 889d63ffd87SPaolo Bonzini 890bae8196dSPaolo Bonzini static void mirror_pause(BlockJob *job) 891565ac01fSStefan Hajnoczi { 892565ac01fSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 893565ac01fSStefan Hajnoczi 894bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 895565ac01fSStefan Hajnoczi } 896565ac01fSStefan Hajnoczi 897565ac01fSStefan Hajnoczi static void mirror_attached_aio_context(BlockJob *job, AioContext *new_context) 898565ac01fSStefan Hajnoczi { 899565ac01fSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 900565ac01fSStefan Hajnoczi 901565ac01fSStefan Hajnoczi blk_set_aio_context(s->target, new_context); 902565ac01fSStefan Hajnoczi } 903565ac01fSStefan Hajnoczi 904bae8196dSPaolo Bonzini static void mirror_drain(BlockJob *job) 905bae8196dSPaolo Bonzini { 906bae8196dSPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 907bae8196dSPaolo Bonzini 908bae8196dSPaolo Bonzini /* Need to keep a reference in case blk_drain triggers execution 909bae8196dSPaolo Bonzini * of mirror_complete... 910bae8196dSPaolo Bonzini */ 911bae8196dSPaolo Bonzini if (s->target) { 912bae8196dSPaolo Bonzini BlockBackend *target = s->target; 913bae8196dSPaolo Bonzini blk_ref(target); 914bae8196dSPaolo Bonzini blk_drain(target); 915bae8196dSPaolo Bonzini blk_unref(target); 916bae8196dSPaolo Bonzini } 917bae8196dSPaolo Bonzini } 918bae8196dSPaolo Bonzini 9193fc4b10aSFam Zheng static const BlockJobDriver mirror_job_driver = { 920893f7ebaSPaolo Bonzini .instance_size = sizeof(MirrorBlockJob), 92179e14bf7SFam Zheng .job_type = BLOCK_JOB_TYPE_MIRROR, 922893f7ebaSPaolo Bonzini .set_speed = mirror_set_speed, 923*a7815a76SJohn Snow .start = mirror_run, 924d63ffd87SPaolo Bonzini .complete = mirror_complete, 925565ac01fSStefan Hajnoczi .pause = mirror_pause, 926565ac01fSStefan Hajnoczi .attached_aio_context = mirror_attached_aio_context, 927bae8196dSPaolo Bonzini .drain = mirror_drain, 928893f7ebaSPaolo Bonzini }; 929893f7ebaSPaolo Bonzini 93003544a6eSFam Zheng static const BlockJobDriver commit_active_job_driver = { 93103544a6eSFam Zheng .instance_size = sizeof(MirrorBlockJob), 93203544a6eSFam Zheng .job_type = BLOCK_JOB_TYPE_COMMIT, 93303544a6eSFam Zheng .set_speed = mirror_set_speed, 934*a7815a76SJohn Snow .start = mirror_run, 93503544a6eSFam Zheng .complete = mirror_complete, 936565ac01fSStefan Hajnoczi .pause = mirror_pause, 937565ac01fSStefan Hajnoczi .attached_aio_context = mirror_attached_aio_context, 938bae8196dSPaolo Bonzini .drain = mirror_drain, 93903544a6eSFam Zheng }; 94003544a6eSFam Zheng 94171aa9867SAlberto Garcia static void mirror_start_job(const char *job_id, BlockDriverState *bs, 94247970dfbSJohn Snow int creation_flags, BlockDriverState *target, 94347970dfbSJohn Snow const char *replaces, int64_t speed, 94447970dfbSJohn Snow uint32_t granularity, int64_t buf_size, 945274fcceeSMax Reitz BlockMirrorBackingMode backing_mode, 94603544a6eSFam Zheng BlockdevOnError on_source_error, 947b952b558SPaolo Bonzini BlockdevOnError on_target_error, 9480fc9f8eaSFam Zheng bool unmap, 949097310b5SMarkus Armbruster BlockCompletionFunc *cb, 95003544a6eSFam Zheng void *opaque, Error **errp, 95103544a6eSFam Zheng const BlockJobDriver *driver, 952b49f7eadSWen Congyang bool is_none_mode, BlockDriverState *base, 953b49f7eadSWen Congyang bool auto_complete) 954893f7ebaSPaolo Bonzini { 955893f7ebaSPaolo Bonzini MirrorBlockJob *s; 956893f7ebaSPaolo Bonzini 957eee13dfeSPaolo Bonzini if (granularity == 0) { 958341ebc2fSJohn Snow granularity = bdrv_get_default_bitmap_granularity(target); 959eee13dfeSPaolo Bonzini } 960eee13dfeSPaolo Bonzini 961eee13dfeSPaolo Bonzini assert ((granularity & (granularity - 1)) == 0); 962eee13dfeSPaolo Bonzini 96348ac0a4dSWen Congyang if (buf_size < 0) { 96448ac0a4dSWen Congyang error_setg(errp, "Invalid parameter 'buf-size'"); 96548ac0a4dSWen Congyang return; 96648ac0a4dSWen Congyang } 96748ac0a4dSWen Congyang 96848ac0a4dSWen Congyang if (buf_size == 0) { 96948ac0a4dSWen Congyang buf_size = DEFAULT_MIRROR_BUF_SIZE; 97048ac0a4dSWen Congyang } 9715bc361b8SFam Zheng 97247970dfbSJohn Snow s = block_job_create(job_id, driver, bs, speed, creation_flags, 97347970dfbSJohn Snow cb, opaque, errp); 974893f7ebaSPaolo Bonzini if (!s) { 975893f7ebaSPaolo Bonzini return; 976893f7ebaSPaolo Bonzini } 977893f7ebaSPaolo Bonzini 978e253f4b8SKevin Wolf s->target = blk_new(); 979e253f4b8SKevin Wolf blk_insert_bs(s->target, target); 980e253f4b8SKevin Wolf 98109158f00SBenoît Canet s->replaces = g_strdup(replaces); 982b952b558SPaolo Bonzini s->on_source_error = on_source_error; 983b952b558SPaolo Bonzini s->on_target_error = on_target_error; 98403544a6eSFam Zheng s->is_none_mode = is_none_mode; 985274fcceeSMax Reitz s->backing_mode = backing_mode; 9865bc361b8SFam Zheng s->base = base; 987eee13dfeSPaolo Bonzini s->granularity = granularity; 98848ac0a4dSWen Congyang s->buf_size = ROUND_UP(buf_size, granularity); 9890fc9f8eaSFam Zheng s->unmap = unmap; 990b49f7eadSWen Congyang if (auto_complete) { 991b49f7eadSWen Congyang s->should_complete = true; 992b49f7eadSWen Congyang } 993b812f671SPaolo Bonzini 9940db6e54aSFam Zheng s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); 995b8afb520SFam Zheng if (!s->dirty_bitmap) { 99697031164STing Wang g_free(s->replaces); 997e253f4b8SKevin Wolf blk_unref(s->target); 99818930ba3SFam Zheng block_job_unref(&s->common); 999b8afb520SFam Zheng return; 1000b8afb520SFam Zheng } 100110f3cd15SAlberto Garcia 1002cee3c6b5SAlberto Garcia block_job_add_bdrv(&s->common, target); 1003f3ede4b0SAlberto Garcia /* In commit_active_start() all intermediate nodes disappear, so 1004f3ede4b0SAlberto Garcia * any jobs in them must be blocked */ 1005f3ede4b0SAlberto Garcia if (bdrv_chain_contains(bs, target)) { 1006f3ede4b0SAlberto Garcia BlockDriverState *iter; 1007f3ede4b0SAlberto Garcia for (iter = backing_bs(bs); iter != target; iter = backing_bs(iter)) { 1008f3ede4b0SAlberto Garcia block_job_add_bdrv(&s->common, iter); 1009f3ede4b0SAlberto Garcia } 1010f3ede4b0SAlberto Garcia } 101110f3cd15SAlberto Garcia 1012*a7815a76SJohn Snow s->common.co = qemu_coroutine_create(s->common.driver->start, s); 1013893f7ebaSPaolo Bonzini trace_mirror_start(bs, s, s->common.co, opaque); 10140b8b8753SPaolo Bonzini qemu_coroutine_enter(s->common.co); 1015893f7ebaSPaolo Bonzini } 101603544a6eSFam Zheng 101771aa9867SAlberto Garcia void mirror_start(const char *job_id, BlockDriverState *bs, 101871aa9867SAlberto Garcia BlockDriverState *target, const char *replaces, 10195fba6c0eSJohn Snow int64_t speed, uint32_t granularity, int64_t buf_size, 1020274fcceeSMax Reitz MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, 1021274fcceeSMax Reitz BlockdevOnError on_source_error, 102203544a6eSFam Zheng BlockdevOnError on_target_error, 10238254b6d9SJohn Snow bool unmap, Error **errp) 102403544a6eSFam Zheng { 102503544a6eSFam Zheng bool is_none_mode; 102603544a6eSFam Zheng BlockDriverState *base; 102703544a6eSFam Zheng 10284b80ab2bSJohn Snow if (mode == MIRROR_SYNC_MODE_INCREMENTAL) { 10294b80ab2bSJohn Snow error_setg(errp, "Sync mode 'incremental' not supported"); 1030d58d8453SJohn Snow return; 1031d58d8453SJohn Snow } 103203544a6eSFam Zheng is_none_mode = mode == MIRROR_SYNC_MODE_NONE; 1033760e0063SKevin Wolf base = mode == MIRROR_SYNC_MODE_TOP ? backing_bs(bs) : NULL; 103447970dfbSJohn Snow mirror_start_job(job_id, bs, BLOCK_JOB_DEFAULT, target, replaces, 1035274fcceeSMax Reitz speed, granularity, buf_size, backing_mode, 10368254b6d9SJohn Snow on_source_error, on_target_error, unmap, NULL, NULL, errp, 1037b49f7eadSWen Congyang &mirror_job_driver, is_none_mode, base, false); 103803544a6eSFam Zheng } 103903544a6eSFam Zheng 1040fd62c609SAlberto Garcia void commit_active_start(const char *job_id, BlockDriverState *bs, 104147970dfbSJohn Snow BlockDriverState *base, int creation_flags, 104247970dfbSJohn Snow int64_t speed, BlockdevOnError on_error, 104347970dfbSJohn Snow BlockCompletionFunc *cb, void *opaque, Error **errp, 1044b49f7eadSWen Congyang bool auto_complete) 104503544a6eSFam Zheng { 10464da83585SJeff Cody int64_t length, base_length; 10474da83585SJeff Cody int orig_base_flags; 104839a611a3SJeff Cody int ret; 1049cc67f4d1SJeff Cody Error *local_err = NULL; 10504da83585SJeff Cody 10514da83585SJeff Cody orig_base_flags = bdrv_get_flags(base); 10524da83585SJeff Cody 105320a63d2cSFam Zheng if (bdrv_reopen(base, bs->open_flags, errp)) { 105420a63d2cSFam Zheng return; 105520a63d2cSFam Zheng } 10564da83585SJeff Cody 10574da83585SJeff Cody length = bdrv_getlength(bs); 10584da83585SJeff Cody if (length < 0) { 105939a611a3SJeff Cody error_setg_errno(errp, -length, 106039a611a3SJeff Cody "Unable to determine length of %s", bs->filename); 10614da83585SJeff Cody goto error_restore_flags; 10624da83585SJeff Cody } 10634da83585SJeff Cody 10644da83585SJeff Cody base_length = bdrv_getlength(base); 10654da83585SJeff Cody if (base_length < 0) { 106639a611a3SJeff Cody error_setg_errno(errp, -base_length, 106739a611a3SJeff Cody "Unable to determine length of %s", base->filename); 10684da83585SJeff Cody goto error_restore_flags; 10694da83585SJeff Cody } 10704da83585SJeff Cody 10714da83585SJeff Cody if (length > base_length) { 107239a611a3SJeff Cody ret = bdrv_truncate(base, length); 107339a611a3SJeff Cody if (ret < 0) { 107439a611a3SJeff Cody error_setg_errno(errp, -ret, 107539a611a3SJeff Cody "Top image %s is larger than base image %s, and " 10764da83585SJeff Cody "resize of base image failed", 10774da83585SJeff Cody bs->filename, base->filename); 10784da83585SJeff Cody goto error_restore_flags; 10794da83585SJeff Cody } 10804da83585SJeff Cody } 10814da83585SJeff Cody 108247970dfbSJohn Snow mirror_start_job(job_id, bs, creation_flags, base, NULL, speed, 0, 0, 108371aa9867SAlberto Garcia MIRROR_LEAVE_BACKING_CHAIN, 10846f13acf9SFam Zheng on_error, on_error, true, cb, opaque, &local_err, 1085b49f7eadSWen Congyang &commit_active_job_driver, false, base, auto_complete); 10860fb6395cSMarkus Armbruster if (local_err) { 1087cc67f4d1SJeff Cody error_propagate(errp, local_err); 10884da83585SJeff Cody goto error_restore_flags; 10894da83585SJeff Cody } 10904da83585SJeff Cody 10914da83585SJeff Cody return; 10924da83585SJeff Cody 10934da83585SJeff Cody error_restore_flags: 10944da83585SJeff Cody /* ignore error and errp for bdrv_reopen, because we want to propagate 10954da83585SJeff Cody * the original error */ 10964da83585SJeff Cody bdrv_reopen(base, orig_base_flags, NULL); 10974da83585SJeff Cody return; 109803544a6eSFam Zheng } 1099