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" 15fd4a6493SKevin Wolf #include "qemu/cutils.h" 16893f7ebaSPaolo Bonzini #include "trace.h" 17c87621eaSJohn Snow #include "block/blockjob_int.h" 18737e150eSPaolo Bonzini #include "block/block_int.h" 19373340b2SMax Reitz #include "sysemu/block-backend.h" 20da34e65cSMarkus Armbruster #include "qapi/error.h" 21cc7a8ea7SMarkus Armbruster #include "qapi/qmp/qerror.h" 22893f7ebaSPaolo Bonzini #include "qemu/ratelimit.h" 23b812f671SPaolo Bonzini #include "qemu/bitmap.h" 24893f7ebaSPaolo Bonzini 25893f7ebaSPaolo Bonzini #define SLICE_TIME 100000000ULL /* ns */ 26402a4741SPaolo Bonzini #define MAX_IN_FLIGHT 16 27b436982fSEric Blake #define MAX_IO_BYTES (1 << 20) /* 1 Mb */ 28b436982fSEric Blake #define DEFAULT_MIRROR_BUF_SIZE (MAX_IN_FLIGHT * MAX_IO_BYTES) 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; 414ef85a9cSKevin Wolf BlockDriverState *mirror_top_bs; 424ef85a9cSKevin Wolf BlockDriverState *source; 435bc361b8SFam Zheng BlockDriverState *base; 444ef85a9cSKevin Wolf 4509158f00SBenoît Canet /* The name of the graph node to replace */ 4609158f00SBenoît Canet char *replaces; 4709158f00SBenoît Canet /* The BDS to replace */ 4809158f00SBenoît Canet BlockDriverState *to_replace; 4909158f00SBenoît Canet /* Used to block operations on the drive-mirror-replace target */ 5009158f00SBenoît Canet Error *replace_blocker; 5103544a6eSFam Zheng bool is_none_mode; 52274fcceeSMax Reitz BlockMirrorBackingMode backing_mode; 53b952b558SPaolo Bonzini BlockdevOnError on_source_error, on_target_error; 54d63ffd87SPaolo Bonzini bool synced; 55d63ffd87SPaolo Bonzini bool should_complete; 56eee13dfeSPaolo Bonzini int64_t granularity; 57b812f671SPaolo Bonzini size_t buf_size; 58b21c7652SMax Reitz int64_t bdev_length; 59b812f671SPaolo Bonzini unsigned long *cow_bitmap; 60e4654d2dSFam Zheng BdrvDirtyBitmap *dirty_bitmap; 61dc162c8eSFam Zheng BdrvDirtyBitmapIter *dbi; 62893f7ebaSPaolo Bonzini uint8_t *buf; 63402a4741SPaolo Bonzini QSIMPLEQ_HEAD(, MirrorBuffer) buf_free; 64402a4741SPaolo Bonzini int buf_free_count; 65bd48bde8SPaolo Bonzini 6649efb1f5SDenis V. Lunev uint64_t last_pause_ns; 67402a4741SPaolo Bonzini unsigned long *in_flight_bitmap; 68bd48bde8SPaolo Bonzini int in_flight; 69b436982fSEric Blake int64_t bytes_in_flight; 70bd48bde8SPaolo Bonzini int ret; 710fc9f8eaSFam Zheng bool unmap; 72e424aff5SKevin Wolf bool waiting_for_io; 73b436982fSEric Blake int target_cluster_size; 74e5b43573SFam Zheng int max_iov; 7590ab48ebSAnton Nefedov bool initial_zeroing_ongoing; 76893f7ebaSPaolo Bonzini } MirrorBlockJob; 77893f7ebaSPaolo Bonzini 78bd48bde8SPaolo Bonzini typedef struct MirrorOp { 79bd48bde8SPaolo Bonzini MirrorBlockJob *s; 80bd48bde8SPaolo Bonzini QEMUIOVector qiov; 81b436982fSEric Blake int64_t offset; 82b436982fSEric Blake uint64_t bytes; 83bd48bde8SPaolo Bonzini } MirrorOp; 84bd48bde8SPaolo Bonzini 85b952b558SPaolo Bonzini static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read, 86b952b558SPaolo Bonzini int error) 87b952b558SPaolo Bonzini { 88b952b558SPaolo Bonzini s->synced = false; 89b952b558SPaolo Bonzini if (read) { 9081e254dcSKevin Wolf return block_job_error_action(&s->common, s->on_source_error, 9181e254dcSKevin Wolf true, error); 92b952b558SPaolo Bonzini } else { 9381e254dcSKevin Wolf return block_job_error_action(&s->common, s->on_target_error, 9481e254dcSKevin Wolf false, error); 95b952b558SPaolo Bonzini } 96b952b558SPaolo Bonzini } 97b952b558SPaolo Bonzini 98bd48bde8SPaolo Bonzini static void mirror_iteration_done(MirrorOp *op, int ret) 99bd48bde8SPaolo Bonzini { 100bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 101402a4741SPaolo Bonzini struct iovec *iov; 102bd48bde8SPaolo Bonzini int64_t chunk_num; 103b436982fSEric Blake int i, nb_chunks; 104bd48bde8SPaolo Bonzini 105b436982fSEric Blake trace_mirror_iteration_done(s, op->offset, op->bytes, ret); 106bd48bde8SPaolo Bonzini 107bd48bde8SPaolo Bonzini s->in_flight--; 108b436982fSEric Blake s->bytes_in_flight -= op->bytes; 109402a4741SPaolo Bonzini iov = op->qiov.iov; 110402a4741SPaolo Bonzini for (i = 0; i < op->qiov.niov; i++) { 111402a4741SPaolo Bonzini MirrorBuffer *buf = (MirrorBuffer *) iov[i].iov_base; 112402a4741SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&s->buf_free, buf, next); 113402a4741SPaolo Bonzini s->buf_free_count++; 114402a4741SPaolo Bonzini } 115402a4741SPaolo Bonzini 116b436982fSEric Blake chunk_num = op->offset / s->granularity; 117b436982fSEric Blake nb_chunks = DIV_ROUND_UP(op->bytes, s->granularity); 118402a4741SPaolo Bonzini bitmap_clear(s->in_flight_bitmap, chunk_num, nb_chunks); 119b21c7652SMax Reitz if (ret >= 0) { 120b21c7652SMax Reitz if (s->cow_bitmap) { 121bd48bde8SPaolo Bonzini bitmap_set(s->cow_bitmap, chunk_num, nb_chunks); 122bd48bde8SPaolo Bonzini } 12390ab48ebSAnton Nefedov if (!s->initial_zeroing_ongoing) { 124b436982fSEric Blake s->common.offset += op->bytes; 125b21c7652SMax Reitz } 12690ab48ebSAnton Nefedov } 1276df3bf8eSZhang Min qemu_iovec_destroy(&op->qiov); 128c84b3192SPaolo Bonzini g_free(op); 1297b770c72SStefan Hajnoczi 130e424aff5SKevin Wolf if (s->waiting_for_io) { 1310b8b8753SPaolo Bonzini qemu_coroutine_enter(s->common.co); 132bd48bde8SPaolo Bonzini } 1337b770c72SStefan Hajnoczi } 134bd48bde8SPaolo Bonzini 135bd48bde8SPaolo Bonzini static void mirror_write_complete(void *opaque, int ret) 136bd48bde8SPaolo Bonzini { 137bd48bde8SPaolo Bonzini MirrorOp *op = opaque; 138bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 139b9e413ddSPaolo Bonzini 140b9e413ddSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->common.blk)); 141bd48bde8SPaolo Bonzini if (ret < 0) { 142bd48bde8SPaolo Bonzini BlockErrorAction action; 143bd48bde8SPaolo Bonzini 144b436982fSEric Blake bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset >> BDRV_SECTOR_BITS, 145b436982fSEric Blake op->bytes >> BDRV_SECTOR_BITS); 146bd48bde8SPaolo Bonzini action = mirror_error_action(s, false, -ret); 147a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { 148bd48bde8SPaolo Bonzini s->ret = ret; 149bd48bde8SPaolo Bonzini } 150bd48bde8SPaolo Bonzini } 151bd48bde8SPaolo Bonzini mirror_iteration_done(op, ret); 152b9e413ddSPaolo Bonzini aio_context_release(blk_get_aio_context(s->common.blk)); 153bd48bde8SPaolo Bonzini } 154bd48bde8SPaolo Bonzini 155bd48bde8SPaolo Bonzini static void mirror_read_complete(void *opaque, int ret) 156bd48bde8SPaolo Bonzini { 157bd48bde8SPaolo Bonzini MirrorOp *op = opaque; 158bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 159b9e413ddSPaolo Bonzini 160b9e413ddSPaolo Bonzini aio_context_acquire(blk_get_aio_context(s->common.blk)); 161bd48bde8SPaolo Bonzini if (ret < 0) { 162bd48bde8SPaolo Bonzini BlockErrorAction action; 163bd48bde8SPaolo Bonzini 164b436982fSEric Blake bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset >> BDRV_SECTOR_BITS, 165b436982fSEric Blake op->bytes >> BDRV_SECTOR_BITS); 166bd48bde8SPaolo Bonzini action = mirror_error_action(s, true, -ret); 167a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { 168bd48bde8SPaolo Bonzini s->ret = ret; 169bd48bde8SPaolo Bonzini } 170bd48bde8SPaolo Bonzini 171bd48bde8SPaolo Bonzini mirror_iteration_done(op, ret); 172b9e413ddSPaolo Bonzini } else { 173b436982fSEric Blake blk_aio_pwritev(s->target, op->offset, &op->qiov, 17473698c30SEric Blake 0, mirror_write_complete, op); 175bd48bde8SPaolo Bonzini } 176b9e413ddSPaolo Bonzini aio_context_release(blk_get_aio_context(s->common.blk)); 177b9e413ddSPaolo Bonzini } 178bd48bde8SPaolo Bonzini 1794150ae60SFam Zheng static inline void mirror_clip_sectors(MirrorBlockJob *s, 1804150ae60SFam Zheng int64_t sector_num, 1814150ae60SFam Zheng int *nb_sectors) 1824150ae60SFam Zheng { 1834150ae60SFam Zheng *nb_sectors = MIN(*nb_sectors, 1844150ae60SFam Zheng s->bdev_length / BDRV_SECTOR_SIZE - sector_num); 1854150ae60SFam Zheng } 1864150ae60SFam Zheng 187e5b43573SFam Zheng /* Round sector_num and/or nb_sectors to target cluster if COW is needed, and 188e5b43573SFam Zheng * return the offset of the adjusted tail sector against original. */ 189e5b43573SFam Zheng static int mirror_cow_align(MirrorBlockJob *s, 190e5b43573SFam Zheng int64_t *sector_num, 191e5b43573SFam Zheng int *nb_sectors) 192893f7ebaSPaolo Bonzini { 193e5b43573SFam Zheng bool need_cow; 194e5b43573SFam Zheng int ret = 0; 195e5b43573SFam Zheng int chunk_sectors = s->granularity >> BDRV_SECTOR_BITS; 196e5b43573SFam Zheng int64_t align_sector_num = *sector_num; 197e5b43573SFam Zheng int align_nb_sectors = *nb_sectors; 198e5b43573SFam Zheng int max_sectors = chunk_sectors * s->max_iov; 199893f7ebaSPaolo Bonzini 200e5b43573SFam Zheng need_cow = !test_bit(*sector_num / chunk_sectors, s->cow_bitmap); 201e5b43573SFam Zheng need_cow |= !test_bit((*sector_num + *nb_sectors - 1) / chunk_sectors, 202e5b43573SFam Zheng s->cow_bitmap); 203e5b43573SFam Zheng if (need_cow) { 204244483e6SKevin Wolf bdrv_round_sectors_to_clusters(blk_bs(s->target), *sector_num, 205244483e6SKevin Wolf *nb_sectors, &align_sector_num, 206244483e6SKevin Wolf &align_nb_sectors); 2078f0720ecSPaolo Bonzini } 2088f0720ecSPaolo Bonzini 209e5b43573SFam Zheng if (align_nb_sectors > max_sectors) { 210e5b43573SFam Zheng align_nb_sectors = max_sectors; 211e5b43573SFam Zheng if (need_cow) { 212e5b43573SFam Zheng align_nb_sectors = QEMU_ALIGN_DOWN(align_nb_sectors, 213b436982fSEric Blake s->target_cluster_size >> 214b436982fSEric Blake BDRV_SECTOR_BITS); 215e5b43573SFam Zheng } 216e5b43573SFam Zheng } 2174150ae60SFam Zheng /* Clipping may result in align_nb_sectors unaligned to chunk boundary, but 2184150ae60SFam Zheng * that doesn't matter because it's already the end of source image. */ 2194150ae60SFam Zheng mirror_clip_sectors(s, align_sector_num, &align_nb_sectors); 220402a4741SPaolo Bonzini 221e5b43573SFam Zheng ret = align_sector_num + align_nb_sectors - (*sector_num + *nb_sectors); 222e5b43573SFam Zheng *sector_num = align_sector_num; 223e5b43573SFam Zheng *nb_sectors = align_nb_sectors; 224e5b43573SFam Zheng assert(ret >= 0); 225e5b43573SFam Zheng return ret; 226e5b43573SFam Zheng } 227e5b43573SFam Zheng 22821cd917fSFam Zheng static inline void mirror_wait_for_io(MirrorBlockJob *s) 22921cd917fSFam Zheng { 23021cd917fSFam Zheng assert(!s->waiting_for_io); 23121cd917fSFam Zheng s->waiting_for_io = true; 23221cd917fSFam Zheng qemu_coroutine_yield(); 23321cd917fSFam Zheng s->waiting_for_io = false; 23421cd917fSFam Zheng } 23521cd917fSFam Zheng 236e5b43573SFam Zheng /* Submit async read while handling COW. 23717612955SJohn Snow * Returns: The number of sectors copied after and including sector_num, 23817612955SJohn Snow * excluding any sectors copied prior to sector_num due to alignment. 23917612955SJohn Snow * This will be nb_sectors if no alignment is necessary, or 240e5b43573SFam Zheng * (new_end - sector_num) if tail is rounded up or down due to 241e5b43573SFam Zheng * alignment or buffer limit. 242402a4741SPaolo Bonzini */ 243e5b43573SFam Zheng static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num, 244e5b43573SFam Zheng int nb_sectors) 245e5b43573SFam Zheng { 246e253f4b8SKevin Wolf BlockBackend *source = s->common.blk; 247e5b43573SFam Zheng int sectors_per_chunk, nb_chunks; 24817612955SJohn Snow int ret; 249e5b43573SFam Zheng MirrorOp *op; 250e4808881SJohn Snow int max_sectors; 251402a4741SPaolo Bonzini 252e5b43573SFam Zheng sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 253e4808881SJohn Snow max_sectors = sectors_per_chunk * s->max_iov; 254e5b43573SFam Zheng 255e5b43573SFam Zheng /* We can only handle as much as buf_size at a time. */ 256e5b43573SFam Zheng nb_sectors = MIN(s->buf_size >> BDRV_SECTOR_BITS, nb_sectors); 257e4808881SJohn Snow nb_sectors = MIN(max_sectors, nb_sectors); 258e5b43573SFam Zheng assert(nb_sectors); 25917612955SJohn Snow ret = nb_sectors; 260e5b43573SFam Zheng 261e5b43573SFam Zheng if (s->cow_bitmap) { 262e5b43573SFam Zheng ret += mirror_cow_align(s, §or_num, &nb_sectors); 263e5b43573SFam Zheng } 264e5b43573SFam Zheng assert(nb_sectors << BDRV_SECTOR_BITS <= s->buf_size); 265e5b43573SFam Zheng /* The sector range must meet granularity because: 266e5b43573SFam Zheng * 1) Caller passes in aligned values; 267e5b43573SFam Zheng * 2) mirror_cow_align is used only when target cluster is larger. */ 268e5b43573SFam Zheng assert(!(sector_num % sectors_per_chunk)); 2694150ae60SFam Zheng nb_chunks = DIV_ROUND_UP(nb_sectors, sectors_per_chunk); 270e5b43573SFam Zheng 271e5b43573SFam Zheng while (s->buf_free_count < nb_chunks) { 2725cb1a49eSEric Blake trace_mirror_yield_in_flight(s, sector_num * BDRV_SECTOR_SIZE, 2735cb1a49eSEric Blake s->in_flight); 27421cd917fSFam Zheng mirror_wait_for_io(s); 275b812f671SPaolo Bonzini } 276b812f671SPaolo Bonzini 277bd48bde8SPaolo Bonzini /* Allocate a MirrorOp that is used as an AIO callback. */ 278c84b3192SPaolo Bonzini op = g_new(MirrorOp, 1); 279bd48bde8SPaolo Bonzini op->s = s; 280b436982fSEric Blake op->offset = sector_num * BDRV_SECTOR_SIZE; 281b436982fSEric Blake op->bytes = nb_sectors * BDRV_SECTOR_SIZE; 282402a4741SPaolo Bonzini 283402a4741SPaolo Bonzini /* Now make a QEMUIOVector taking enough granularity-sized chunks 284402a4741SPaolo Bonzini * from s->buf_free. 285402a4741SPaolo Bonzini */ 286402a4741SPaolo Bonzini qemu_iovec_init(&op->qiov, nb_chunks); 287402a4741SPaolo Bonzini while (nb_chunks-- > 0) { 288402a4741SPaolo Bonzini MirrorBuffer *buf = QSIMPLEQ_FIRST(&s->buf_free); 289e5b43573SFam Zheng size_t remaining = nb_sectors * BDRV_SECTOR_SIZE - op->qiov.size; 2905a0f6fd5SKevin Wolf 291402a4741SPaolo Bonzini QSIMPLEQ_REMOVE_HEAD(&s->buf_free, next); 292402a4741SPaolo Bonzini s->buf_free_count--; 2935a0f6fd5SKevin Wolf qemu_iovec_add(&op->qiov, buf, MIN(s->granularity, remaining)); 294402a4741SPaolo Bonzini } 295402a4741SPaolo Bonzini 296893f7ebaSPaolo Bonzini /* Copy the dirty cluster. */ 297bd48bde8SPaolo Bonzini s->in_flight++; 298b436982fSEric Blake s->bytes_in_flight += nb_sectors * BDRV_SECTOR_SIZE; 2995cb1a49eSEric Blake trace_mirror_one_iteration(s, sector_num * BDRV_SECTOR_SIZE, 3005cb1a49eSEric Blake nb_sectors * BDRV_SECTOR_SIZE); 301dcfb3bebSFam Zheng 30273698c30SEric Blake blk_aio_preadv(source, sector_num * BDRV_SECTOR_SIZE, &op->qiov, 0, 303bd48bde8SPaolo Bonzini mirror_read_complete, op); 304e5b43573SFam Zheng return ret; 305e5b43573SFam Zheng } 306e5b43573SFam Zheng 307e5b43573SFam Zheng static void mirror_do_zero_or_discard(MirrorBlockJob *s, 308*e6f24193SEric Blake int64_t offset, 309*e6f24193SEric Blake uint64_t bytes, 310e5b43573SFam Zheng bool is_discard) 311e5b43573SFam Zheng { 312e5b43573SFam Zheng MirrorOp *op; 313e5b43573SFam Zheng 314e5b43573SFam Zheng /* Allocate a MirrorOp that is used as an AIO callback. The qiov is zeroed 315e5b43573SFam Zheng * so the freeing in mirror_iteration_done is nop. */ 316e5b43573SFam Zheng op = g_new0(MirrorOp, 1); 317e5b43573SFam Zheng op->s = s; 318*e6f24193SEric Blake op->offset = offset; 319*e6f24193SEric Blake op->bytes = bytes; 320e5b43573SFam Zheng 321e5b43573SFam Zheng s->in_flight++; 322*e6f24193SEric Blake s->bytes_in_flight += bytes; 323e5b43573SFam Zheng if (is_discard) { 324*e6f24193SEric Blake blk_aio_pdiscard(s->target, offset, 325b436982fSEric Blake op->bytes, mirror_write_complete, op); 326e5b43573SFam Zheng } else { 327*e6f24193SEric Blake blk_aio_pwrite_zeroes(s->target, offset, 328b436982fSEric Blake op->bytes, s->unmap ? BDRV_REQ_MAY_UNMAP : 0, 329dcfb3bebSFam Zheng mirror_write_complete, op); 330e5b43573SFam Zheng } 331e5b43573SFam Zheng } 332e5b43573SFam Zheng 333e5b43573SFam Zheng static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) 334e5b43573SFam Zheng { 3354ef85a9cSKevin Wolf BlockDriverState *source = s->source; 3369c83625bSMax Reitz int64_t sector_num, first_chunk; 337e5b43573SFam Zheng uint64_t delay_ns = 0; 338e5b43573SFam Zheng /* At least the first dirty chunk is mirrored in one iteration. */ 339e5b43573SFam Zheng int nb_chunks = 1; 340e5b43573SFam Zheng int64_t end = s->bdev_length / BDRV_SECTOR_SIZE; 341e5b43573SFam Zheng int sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; 3424b5004d9SDenis V. Lunev bool write_zeroes_ok = bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)); 343b436982fSEric Blake int max_io_bytes = MAX(s->buf_size / MAX_IN_FLIGHT, MAX_IO_BYTES); 344e5b43573SFam Zheng 345b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_lock(s->dirty_bitmap); 346dc162c8eSFam Zheng sector_num = bdrv_dirty_iter_next(s->dbi); 347e5b43573SFam Zheng if (sector_num < 0) { 348dc162c8eSFam Zheng bdrv_set_dirty_iter(s->dbi, 0); 349dc162c8eSFam Zheng sector_num = bdrv_dirty_iter_next(s->dbi); 3505cb1a49eSEric Blake trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap) * 3515cb1a49eSEric Blake BDRV_SECTOR_SIZE); 352e5b43573SFam Zheng assert(sector_num >= 0); 353e5b43573SFam Zheng } 354b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_unlock(s->dirty_bitmap); 355e5b43573SFam Zheng 3569c83625bSMax Reitz first_chunk = sector_num / sectors_per_chunk; 3579c83625bSMax Reitz while (test_bit(first_chunk, s->in_flight_bitmap)) { 3585cb1a49eSEric Blake trace_mirror_yield_in_flight(s, sector_num * BDRV_SECTOR_SIZE, 3595cb1a49eSEric Blake s->in_flight); 3609c83625bSMax Reitz mirror_wait_for_io(s); 3619c83625bSMax Reitz } 3629c83625bSMax Reitz 363565ac01fSStefan Hajnoczi block_job_pause_point(&s->common); 364565ac01fSStefan Hajnoczi 365e5b43573SFam Zheng /* Find the number of consective dirty chunks following the first dirty 366e5b43573SFam Zheng * one, and wait for in flight requests in them. */ 367b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_lock(s->dirty_bitmap); 368e5b43573SFam Zheng while (nb_chunks * sectors_per_chunk < (s->buf_size >> BDRV_SECTOR_BITS)) { 369dc162c8eSFam Zheng int64_t next_dirty; 370e5b43573SFam Zheng int64_t next_sector = sector_num + nb_chunks * sectors_per_chunk; 371e5b43573SFam Zheng int64_t next_chunk = next_sector / sectors_per_chunk; 372e5b43573SFam Zheng if (next_sector >= end || 373b64bd51eSPaolo Bonzini !bdrv_get_dirty_locked(source, s->dirty_bitmap, next_sector)) { 374e5b43573SFam Zheng break; 375e5b43573SFam Zheng } 376e5b43573SFam Zheng if (test_bit(next_chunk, s->in_flight_bitmap)) { 377e5b43573SFam Zheng break; 378e5b43573SFam Zheng } 3799c83625bSMax Reitz 380dc162c8eSFam Zheng next_dirty = bdrv_dirty_iter_next(s->dbi); 381dc162c8eSFam Zheng if (next_dirty > next_sector || next_dirty < 0) { 382f27a2742SMax Reitz /* The bitmap iterator's cache is stale, refresh it */ 383dc162c8eSFam Zheng bdrv_set_dirty_iter(s->dbi, next_sector); 384dc162c8eSFam Zheng next_dirty = bdrv_dirty_iter_next(s->dbi); 385f27a2742SMax Reitz } 386dc162c8eSFam Zheng assert(next_dirty == next_sector); 387e5b43573SFam Zheng nb_chunks++; 388e5b43573SFam Zheng } 389e5b43573SFam Zheng 390e5b43573SFam Zheng /* Clear dirty bits before querying the block status, because 391e5b43573SFam Zheng * calling bdrv_get_block_status_above could yield - if some blocks are 392e5b43573SFam Zheng * marked dirty in this window, we need to know. 393e5b43573SFam Zheng */ 394b64bd51eSPaolo Bonzini bdrv_reset_dirty_bitmap_locked(s->dirty_bitmap, sector_num, 395e5b43573SFam Zheng nb_chunks * sectors_per_chunk); 396b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_unlock(s->dirty_bitmap); 397b64bd51eSPaolo Bonzini 398e5b43573SFam Zheng bitmap_set(s->in_flight_bitmap, sector_num / sectors_per_chunk, nb_chunks); 399e5b43573SFam Zheng while (nb_chunks > 0 && sector_num < end) { 40039c11580SJohn Snow int64_t ret; 401f3e4ce4aSEric Blake int io_sectors; 402f3e4ce4aSEric Blake int64_t io_bytes_acct; 403e5b43573SFam Zheng BlockDriverState *file; 404e5b43573SFam Zheng enum MirrorMethod { 405e5b43573SFam Zheng MIRROR_METHOD_COPY, 406e5b43573SFam Zheng MIRROR_METHOD_ZERO, 407e5b43573SFam Zheng MIRROR_METHOD_DISCARD 408e5b43573SFam Zheng } mirror_method = MIRROR_METHOD_COPY; 409e5b43573SFam Zheng 410e5b43573SFam Zheng assert(!(sector_num % sectors_per_chunk)); 411e5b43573SFam Zheng ret = bdrv_get_block_status_above(source, NULL, sector_num, 412e5b43573SFam Zheng nb_chunks * sectors_per_chunk, 413e5b43573SFam Zheng &io_sectors, &file); 414e5b43573SFam Zheng if (ret < 0) { 415b436982fSEric Blake io_sectors = MIN(nb_chunks * sectors_per_chunk, 416b436982fSEric Blake max_io_bytes >> BDRV_SECTOR_BITS); 4170965a41eSVladimir Sementsov-Ogievskiy } else if (ret & BDRV_BLOCK_DATA) { 418b436982fSEric Blake io_sectors = MIN(io_sectors, max_io_bytes >> BDRV_SECTOR_BITS); 419e5b43573SFam Zheng } 420e5b43573SFam Zheng 421e5b43573SFam Zheng io_sectors -= io_sectors % sectors_per_chunk; 422e5b43573SFam Zheng if (io_sectors < sectors_per_chunk) { 423e5b43573SFam Zheng io_sectors = sectors_per_chunk; 424e5b43573SFam Zheng } else if (ret >= 0 && !(ret & BDRV_BLOCK_DATA)) { 425e5b43573SFam Zheng int64_t target_sector_num; 426e5b43573SFam Zheng int target_nb_sectors; 427244483e6SKevin Wolf bdrv_round_sectors_to_clusters(blk_bs(s->target), sector_num, 428244483e6SKevin Wolf io_sectors, &target_sector_num, 429244483e6SKevin Wolf &target_nb_sectors); 430e5b43573SFam Zheng if (target_sector_num == sector_num && 431e5b43573SFam Zheng target_nb_sectors == io_sectors) { 432e5b43573SFam Zheng mirror_method = ret & BDRV_BLOCK_ZERO ? 433e5b43573SFam Zheng MIRROR_METHOD_ZERO : 434e5b43573SFam Zheng MIRROR_METHOD_DISCARD; 435e5b43573SFam Zheng } 436e5b43573SFam Zheng } 437e5b43573SFam Zheng 438cf56a3c6SDenis V. Lunev while (s->in_flight >= MAX_IN_FLIGHT) { 4395cb1a49eSEric Blake trace_mirror_yield_in_flight(s, sector_num * BDRV_SECTOR_SIZE, 4405cb1a49eSEric Blake s->in_flight); 441cf56a3c6SDenis V. Lunev mirror_wait_for_io(s); 442cf56a3c6SDenis V. Lunev } 443cf56a3c6SDenis V. Lunev 444dbaa7b57SVladimir Sementsov-Ogievskiy if (s->ret < 0) { 445dbaa7b57SVladimir Sementsov-Ogievskiy return 0; 446dbaa7b57SVladimir Sementsov-Ogievskiy } 447dbaa7b57SVladimir Sementsov-Ogievskiy 4484150ae60SFam Zheng mirror_clip_sectors(s, sector_num, &io_sectors); 449e5b43573SFam Zheng switch (mirror_method) { 450e5b43573SFam Zheng case MIRROR_METHOD_COPY: 451e5b43573SFam Zheng io_sectors = mirror_do_read(s, sector_num, io_sectors); 452f3e4ce4aSEric Blake io_bytes_acct = io_sectors * BDRV_SECTOR_SIZE; 453e5b43573SFam Zheng break; 454e5b43573SFam Zheng case MIRROR_METHOD_ZERO: 455e5b43573SFam Zheng case MIRROR_METHOD_DISCARD: 456*e6f24193SEric Blake mirror_do_zero_or_discard(s, sector_num * BDRV_SECTOR_SIZE, 457*e6f24193SEric Blake io_sectors * BDRV_SECTOR_SIZE, 4584b5004d9SDenis V. Lunev mirror_method == MIRROR_METHOD_DISCARD); 4594b5004d9SDenis V. Lunev if (write_zeroes_ok) { 460f3e4ce4aSEric Blake io_bytes_acct = 0; 4614b5004d9SDenis V. Lunev } else { 462f3e4ce4aSEric Blake io_bytes_acct = io_sectors * BDRV_SECTOR_SIZE; 4634b5004d9SDenis V. Lunev } 464e5b43573SFam Zheng break; 465e5b43573SFam Zheng default: 466e5b43573SFam Zheng abort(); 467e5b43573SFam Zheng } 468e5b43573SFam Zheng assert(io_sectors); 469e5b43573SFam Zheng sector_num += io_sectors; 4704150ae60SFam Zheng nb_chunks -= DIV_ROUND_UP(io_sectors, sectors_per_chunk); 471f14a39ccSSascha Silbe if (s->common.speed) { 472f3e4ce4aSEric Blake delay_ns = ratelimit_calculate_delay(&s->limit, io_bytes_acct); 473f14a39ccSSascha Silbe } 474dcfb3bebSFam Zheng } 475cc8c9d6cSPaolo Bonzini return delay_ns; 476893f7ebaSPaolo Bonzini } 477b952b558SPaolo Bonzini 478402a4741SPaolo Bonzini static void mirror_free_init(MirrorBlockJob *s) 479402a4741SPaolo Bonzini { 480402a4741SPaolo Bonzini int granularity = s->granularity; 481402a4741SPaolo Bonzini size_t buf_size = s->buf_size; 482402a4741SPaolo Bonzini uint8_t *buf = s->buf; 483402a4741SPaolo Bonzini 484402a4741SPaolo Bonzini assert(s->buf_free_count == 0); 485402a4741SPaolo Bonzini QSIMPLEQ_INIT(&s->buf_free); 486402a4741SPaolo Bonzini while (buf_size != 0) { 487402a4741SPaolo Bonzini MirrorBuffer *cur = (MirrorBuffer *)buf; 488402a4741SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&s->buf_free, cur, next); 489402a4741SPaolo Bonzini s->buf_free_count++; 490402a4741SPaolo Bonzini buf_size -= granularity; 491402a4741SPaolo Bonzini buf += granularity; 492402a4741SPaolo Bonzini } 493402a4741SPaolo Bonzini } 494402a4741SPaolo Bonzini 495bae8196dSPaolo Bonzini /* This is also used for the .pause callback. There is no matching 496bae8196dSPaolo Bonzini * mirror_resume() because mirror_run() will begin iterating again 497bae8196dSPaolo Bonzini * when the job is resumed. 498bae8196dSPaolo Bonzini */ 499bae8196dSPaolo Bonzini static void mirror_wait_for_all_io(MirrorBlockJob *s) 500bd48bde8SPaolo Bonzini { 501bd48bde8SPaolo Bonzini while (s->in_flight > 0) { 50221cd917fSFam Zheng mirror_wait_for_io(s); 503bd48bde8SPaolo Bonzini } 504893f7ebaSPaolo Bonzini } 505893f7ebaSPaolo Bonzini 5065a7e7a0bSStefan Hajnoczi typedef struct { 5075a7e7a0bSStefan Hajnoczi int ret; 5085a7e7a0bSStefan Hajnoczi } MirrorExitData; 5095a7e7a0bSStefan Hajnoczi 5105a7e7a0bSStefan Hajnoczi static void mirror_exit(BlockJob *job, void *opaque) 5115a7e7a0bSStefan Hajnoczi { 5125a7e7a0bSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 5135a7e7a0bSStefan Hajnoczi MirrorExitData *data = opaque; 5145a7e7a0bSStefan Hajnoczi AioContext *replace_aio_context = NULL; 5154ef85a9cSKevin Wolf BlockDriverState *src = s->source; 516e253f4b8SKevin Wolf BlockDriverState *target_bs = blk_bs(s->target); 5174ef85a9cSKevin Wolf BlockDriverState *mirror_top_bs = s->mirror_top_bs; 51812fa4af6SKevin Wolf Error *local_err = NULL; 5193f09bfbcSKevin Wolf 5202119882cSPaolo Bonzini bdrv_release_dirty_bitmap(src, s->dirty_bitmap); 5212119882cSPaolo Bonzini 5223f09bfbcSKevin Wolf /* Make sure that the source BDS doesn't go away before we called 5233f09bfbcSKevin Wolf * block_job_completed(). */ 5243f09bfbcSKevin Wolf bdrv_ref(src); 5254ef85a9cSKevin Wolf bdrv_ref(mirror_top_bs); 5267d9fcb39SKevin Wolf bdrv_ref(target_bs); 5277d9fcb39SKevin Wolf 5287d9fcb39SKevin Wolf /* Remove target parent that still uses BLK_PERM_WRITE/RESIZE before 5297d9fcb39SKevin Wolf * inserting target_bs at s->to_replace, where we might not be able to get 53063c8ef28SKevin Wolf * these permissions. 53163c8ef28SKevin Wolf * 53263c8ef28SKevin Wolf * Note that blk_unref() alone doesn't necessarily drop permissions because 53363c8ef28SKevin Wolf * we might be running nested inside mirror_drain(), which takes an extra 53463c8ef28SKevin Wolf * reference, so use an explicit blk_set_perm() first. */ 53563c8ef28SKevin Wolf blk_set_perm(s->target, 0, BLK_PERM_ALL, &error_abort); 5367d9fcb39SKevin Wolf blk_unref(s->target); 5377d9fcb39SKevin Wolf s->target = NULL; 5384ef85a9cSKevin Wolf 5394ef85a9cSKevin Wolf /* We don't access the source any more. Dropping any WRITE/RESIZE is 5404ef85a9cSKevin Wolf * required before it could become a backing file of target_bs. */ 5414ef85a9cSKevin Wolf bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL, 5424ef85a9cSKevin Wolf &error_abort); 5434ef85a9cSKevin Wolf if (s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) { 5444ef85a9cSKevin Wolf BlockDriverState *backing = s->is_none_mode ? src : s->base; 5454ef85a9cSKevin Wolf if (backing_bs(target_bs) != backing) { 54612fa4af6SKevin Wolf bdrv_set_backing_hd(target_bs, backing, &local_err); 54712fa4af6SKevin Wolf if (local_err) { 54812fa4af6SKevin Wolf error_report_err(local_err); 54912fa4af6SKevin Wolf data->ret = -EPERM; 55012fa4af6SKevin Wolf } 5514ef85a9cSKevin Wolf } 5524ef85a9cSKevin Wolf } 5535a7e7a0bSStefan Hajnoczi 5545a7e7a0bSStefan Hajnoczi if (s->to_replace) { 5555a7e7a0bSStefan Hajnoczi replace_aio_context = bdrv_get_aio_context(s->to_replace); 5565a7e7a0bSStefan Hajnoczi aio_context_acquire(replace_aio_context); 5575a7e7a0bSStefan Hajnoczi } 5585a7e7a0bSStefan Hajnoczi 5595a7e7a0bSStefan Hajnoczi if (s->should_complete && data->ret == 0) { 560e253f4b8SKevin Wolf BlockDriverState *to_replace = src; 5615a7e7a0bSStefan Hajnoczi if (s->to_replace) { 5625a7e7a0bSStefan Hajnoczi to_replace = s->to_replace; 5635a7e7a0bSStefan Hajnoczi } 56440365552SKevin Wolf 565e253f4b8SKevin Wolf if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) { 566e253f4b8SKevin Wolf bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL); 5675a7e7a0bSStefan Hajnoczi } 568b8804815SKevin Wolf 569b8804815SKevin Wolf /* The mirror job has no requests in flight any more, but we need to 570b8804815SKevin Wolf * drain potential other users of the BDS before changing the graph. */ 571e253f4b8SKevin Wolf bdrv_drained_begin(target_bs); 5725fe31c25SKevin Wolf bdrv_replace_node(to_replace, target_bs, &local_err); 573e253f4b8SKevin Wolf bdrv_drained_end(target_bs); 5745fe31c25SKevin Wolf if (local_err) { 5755fe31c25SKevin Wolf error_report_err(local_err); 5765fe31c25SKevin Wolf data->ret = -EPERM; 5775fe31c25SKevin Wolf } 5785a7e7a0bSStefan Hajnoczi } 5795a7e7a0bSStefan Hajnoczi if (s->to_replace) { 5805a7e7a0bSStefan Hajnoczi bdrv_op_unblock_all(s->to_replace, s->replace_blocker); 5815a7e7a0bSStefan Hajnoczi error_free(s->replace_blocker); 5825a7e7a0bSStefan Hajnoczi bdrv_unref(s->to_replace); 5835a7e7a0bSStefan Hajnoczi } 5845a7e7a0bSStefan Hajnoczi if (replace_aio_context) { 5855a7e7a0bSStefan Hajnoczi aio_context_release(replace_aio_context); 5865a7e7a0bSStefan Hajnoczi } 5875a7e7a0bSStefan Hajnoczi g_free(s->replaces); 5887d9fcb39SKevin Wolf bdrv_unref(target_bs); 5894ef85a9cSKevin Wolf 5904ef85a9cSKevin Wolf /* Remove the mirror filter driver from the graph. Before this, get rid of 5914ef85a9cSKevin Wolf * the blockers on the intermediate nodes so that the resulting state is 5920bf74767SKevin Wolf * valid. Also give up permissions on mirror_top_bs->backing, which might 5930bf74767SKevin Wolf * block the removal. */ 5944ef85a9cSKevin Wolf block_job_remove_all_bdrv(job); 595c1cef672SFam Zheng bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL, 596c1cef672SFam Zheng &error_abort); 5975fe31c25SKevin Wolf bdrv_replace_node(mirror_top_bs, backing_bs(mirror_top_bs), &error_abort); 5984ef85a9cSKevin Wolf 5994ef85a9cSKevin Wolf /* We just changed the BDS the job BB refers to (with either or both of the 6005fe31c25SKevin Wolf * bdrv_replace_node() calls), so switch the BB back so the cleanup does 6015fe31c25SKevin Wolf * the right thing. We don't need any permissions any more now. */ 6024ef85a9cSKevin Wolf blk_remove_bs(job->blk); 6034ef85a9cSKevin Wolf blk_set_perm(job->blk, 0, BLK_PERM_ALL, &error_abort); 6044ef85a9cSKevin Wolf blk_insert_bs(job->blk, mirror_top_bs, &error_abort); 6054ef85a9cSKevin Wolf 6065a7e7a0bSStefan Hajnoczi block_job_completed(&s->common, data->ret); 6074ef85a9cSKevin Wolf 6085a7e7a0bSStefan Hajnoczi g_free(data); 609176c3699SFam Zheng bdrv_drained_end(src); 6104ef85a9cSKevin Wolf bdrv_unref(mirror_top_bs); 6113f09bfbcSKevin Wolf bdrv_unref(src); 6125a7e7a0bSStefan Hajnoczi } 6135a7e7a0bSStefan Hajnoczi 61449efb1f5SDenis V. Lunev static void mirror_throttle(MirrorBlockJob *s) 61549efb1f5SDenis V. Lunev { 61649efb1f5SDenis V. Lunev int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 61749efb1f5SDenis V. Lunev 61849efb1f5SDenis V. Lunev if (now - s->last_pause_ns > SLICE_TIME) { 61949efb1f5SDenis V. Lunev s->last_pause_ns = now; 62049efb1f5SDenis V. Lunev block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, 0); 62149efb1f5SDenis V. Lunev } else { 62249efb1f5SDenis V. Lunev block_job_pause_point(&s->common); 62349efb1f5SDenis V. Lunev } 62449efb1f5SDenis V. Lunev } 62549efb1f5SDenis V. Lunev 626c0b363adSDenis V. Lunev static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s) 627c0b363adSDenis V. Lunev { 628c0b363adSDenis V. Lunev int64_t sector_num, end; 629c0b363adSDenis V. Lunev BlockDriverState *base = s->base; 6304ef85a9cSKevin Wolf BlockDriverState *bs = s->source; 631c0b363adSDenis V. Lunev BlockDriverState *target_bs = blk_bs(s->target); 632c0b363adSDenis V. Lunev int ret, n; 633c0b363adSDenis V. Lunev 634c0b363adSDenis V. Lunev end = s->bdev_length / BDRV_SECTOR_SIZE; 635c0b363adSDenis V. Lunev 636b7d5062cSDenis V. Lunev if (base == NULL && !bdrv_has_zero_init(target_bs)) { 637c7c2769cSDenis V. Lunev if (!bdrv_can_write_zeroes_with_unmap(target_bs)) { 638b7d5062cSDenis V. Lunev bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, end); 639b7d5062cSDenis V. Lunev return 0; 640b7d5062cSDenis V. Lunev } 641b7d5062cSDenis V. Lunev 64290ab48ebSAnton Nefedov s->initial_zeroing_ongoing = true; 643c7c2769cSDenis V. Lunev for (sector_num = 0; sector_num < end; ) { 644c7c2769cSDenis V. Lunev int nb_sectors = MIN(end - sector_num, 645c7c2769cSDenis V. Lunev QEMU_ALIGN_DOWN(INT_MAX, s->granularity) >> BDRV_SECTOR_BITS); 646c7c2769cSDenis V. Lunev 647c7c2769cSDenis V. Lunev mirror_throttle(s); 648c7c2769cSDenis V. Lunev 649c7c2769cSDenis V. Lunev if (block_job_is_cancelled(&s->common)) { 65090ab48ebSAnton Nefedov s->initial_zeroing_ongoing = false; 651c7c2769cSDenis V. Lunev return 0; 652c7c2769cSDenis V. Lunev } 653c7c2769cSDenis V. Lunev 654c7c2769cSDenis V. Lunev if (s->in_flight >= MAX_IN_FLIGHT) { 65567adf4b3SEric Blake trace_mirror_yield(s, UINT64_MAX, s->buf_free_count, 65667adf4b3SEric Blake s->in_flight); 657c7c2769cSDenis V. Lunev mirror_wait_for_io(s); 658c7c2769cSDenis V. Lunev continue; 659c7c2769cSDenis V. Lunev } 660c7c2769cSDenis V. Lunev 661*e6f24193SEric Blake mirror_do_zero_or_discard(s, sector_num * BDRV_SECTOR_SIZE, 662*e6f24193SEric Blake nb_sectors * BDRV_SECTOR_SIZE, false); 663c7c2769cSDenis V. Lunev sector_num += nb_sectors; 664c7c2769cSDenis V. Lunev } 665c7c2769cSDenis V. Lunev 666bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 66790ab48ebSAnton Nefedov s->initial_zeroing_ongoing = false; 668c7c2769cSDenis V. Lunev } 669c7c2769cSDenis V. Lunev 670c0b363adSDenis V. Lunev /* First part, loop on the sectors and initialize the dirty bitmap. */ 671c0b363adSDenis V. Lunev for (sector_num = 0; sector_num < end; ) { 672c0b363adSDenis V. Lunev /* Just to make sure we are not exceeding int limit. */ 673c0b363adSDenis V. Lunev int nb_sectors = MIN(INT_MAX >> BDRV_SECTOR_BITS, 674c0b363adSDenis V. Lunev end - sector_num); 675c0b363adSDenis V. Lunev 676c0b363adSDenis V. Lunev mirror_throttle(s); 677c0b363adSDenis V. Lunev 678c0b363adSDenis V. Lunev if (block_job_is_cancelled(&s->common)) { 679c0b363adSDenis V. Lunev return 0; 680c0b363adSDenis V. Lunev } 681c0b363adSDenis V. Lunev 682c0b363adSDenis V. Lunev ret = bdrv_is_allocated_above(bs, base, sector_num, nb_sectors, &n); 683c0b363adSDenis V. Lunev if (ret < 0) { 684c0b363adSDenis V. Lunev return ret; 685c0b363adSDenis V. Lunev } 686c0b363adSDenis V. Lunev 687c0b363adSDenis V. Lunev assert(n > 0); 688b7d5062cSDenis V. Lunev if (ret == 1) { 689c0b363adSDenis V. Lunev bdrv_set_dirty_bitmap(s->dirty_bitmap, sector_num, n); 690c0b363adSDenis V. Lunev } 691c0b363adSDenis V. Lunev sector_num += n; 692c0b363adSDenis V. Lunev } 693c0b363adSDenis V. Lunev return 0; 694c0b363adSDenis V. Lunev } 695c0b363adSDenis V. Lunev 696bdffb31dSPaolo Bonzini /* Called when going out of the streaming phase to flush the bulk of the 697bdffb31dSPaolo Bonzini * data to the medium, or just before completing. 698bdffb31dSPaolo Bonzini */ 699bdffb31dSPaolo Bonzini static int mirror_flush(MirrorBlockJob *s) 700bdffb31dSPaolo Bonzini { 701bdffb31dSPaolo Bonzini int ret = blk_flush(s->target); 702bdffb31dSPaolo Bonzini if (ret < 0) { 703bdffb31dSPaolo Bonzini if (mirror_error_action(s, false, -ret) == BLOCK_ERROR_ACTION_REPORT) { 704bdffb31dSPaolo Bonzini s->ret = ret; 705bdffb31dSPaolo Bonzini } 706bdffb31dSPaolo Bonzini } 707bdffb31dSPaolo Bonzini return ret; 708bdffb31dSPaolo Bonzini } 709bdffb31dSPaolo Bonzini 710893f7ebaSPaolo Bonzini static void coroutine_fn mirror_run(void *opaque) 711893f7ebaSPaolo Bonzini { 712893f7ebaSPaolo Bonzini MirrorBlockJob *s = opaque; 7135a7e7a0bSStefan Hajnoczi MirrorExitData *data; 7144ef85a9cSKevin Wolf BlockDriverState *bs = s->source; 715e253f4b8SKevin Wolf BlockDriverState *target_bs = blk_bs(s->target); 7169a0cec66SPaolo Bonzini bool need_drain = true; 717c0b363adSDenis V. Lunev int64_t length; 718b812f671SPaolo Bonzini BlockDriverInfo bdi; 7191d33936eSJeff Cody char backing_filename[2]; /* we only need 2 characters because we are only 7201d33936eSJeff Cody checking for a NULL string */ 721893f7ebaSPaolo Bonzini int ret = 0; 722893f7ebaSPaolo Bonzini 723893f7ebaSPaolo Bonzini if (block_job_is_cancelled(&s->common)) { 724893f7ebaSPaolo Bonzini goto immediate_exit; 725893f7ebaSPaolo Bonzini } 726893f7ebaSPaolo Bonzini 727b21c7652SMax Reitz s->bdev_length = bdrv_getlength(bs); 728b21c7652SMax Reitz if (s->bdev_length < 0) { 729b21c7652SMax Reitz ret = s->bdev_length; 730373df5b1SFam Zheng goto immediate_exit; 731becc347eSKevin Wolf } 732becc347eSKevin Wolf 733becc347eSKevin Wolf /* Active commit must resize the base image if its size differs from the 734becc347eSKevin Wolf * active layer. */ 735becc347eSKevin Wolf if (s->base == blk_bs(s->target)) { 736becc347eSKevin Wolf int64_t base_length; 737becc347eSKevin Wolf 738becc347eSKevin Wolf base_length = blk_getlength(s->target); 739becc347eSKevin Wolf if (base_length < 0) { 740becc347eSKevin Wolf ret = base_length; 741becc347eSKevin Wolf goto immediate_exit; 742becc347eSKevin Wolf } 743becc347eSKevin Wolf 744becc347eSKevin Wolf if (s->bdev_length > base_length) { 745ed3d2ec9SMax Reitz ret = blk_truncate(s->target, s->bdev_length, NULL); 746becc347eSKevin Wolf if (ret < 0) { 747becc347eSKevin Wolf goto immediate_exit; 748becc347eSKevin Wolf } 749becc347eSKevin Wolf } 750becc347eSKevin Wolf } 751becc347eSKevin Wolf 752becc347eSKevin Wolf if (s->bdev_length == 0) { 7539e48b025SFam Zheng /* Report BLOCK_JOB_READY and wait for complete. */ 7549e48b025SFam Zheng block_job_event_ready(&s->common); 7559e48b025SFam Zheng s->synced = true; 7569e48b025SFam Zheng while (!block_job_is_cancelled(&s->common) && !s->should_complete) { 7579e48b025SFam Zheng block_job_yield(&s->common); 7589e48b025SFam Zheng } 7599e48b025SFam Zheng s->common.cancelled = false; 7609e48b025SFam Zheng goto immediate_exit; 761893f7ebaSPaolo Bonzini } 762893f7ebaSPaolo Bonzini 763b21c7652SMax Reitz length = DIV_ROUND_UP(s->bdev_length, s->granularity); 764402a4741SPaolo Bonzini s->in_flight_bitmap = bitmap_new(length); 765402a4741SPaolo Bonzini 766b812f671SPaolo Bonzini /* If we have no backing file yet in the destination, we cannot let 767b812f671SPaolo Bonzini * the destination do COW. Instead, we copy sectors around the 768b812f671SPaolo Bonzini * dirty data if needed. We need a bitmap to do that. 769b812f671SPaolo Bonzini */ 770e253f4b8SKevin Wolf bdrv_get_backing_filename(target_bs, backing_filename, 771b812f671SPaolo Bonzini sizeof(backing_filename)); 772e253f4b8SKevin Wolf if (!bdrv_get_info(target_bs, &bdi) && bdi.cluster_size) { 773b436982fSEric Blake s->target_cluster_size = bdi.cluster_size; 774b436982fSEric Blake } else { 775b436982fSEric Blake s->target_cluster_size = BDRV_SECTOR_SIZE; 776c3cc95bdSFam Zheng } 777b436982fSEric Blake if (backing_filename[0] && !target_bs->backing && 778b436982fSEric Blake s->granularity < s->target_cluster_size) { 779b436982fSEric Blake s->buf_size = MAX(s->buf_size, s->target_cluster_size); 780b812f671SPaolo Bonzini s->cow_bitmap = bitmap_new(length); 781b812f671SPaolo Bonzini } 782e253f4b8SKevin Wolf s->max_iov = MIN(bs->bl.max_iov, target_bs->bl.max_iov); 783b812f671SPaolo Bonzini 7847504edf4SKevin Wolf s->buf = qemu_try_blockalign(bs, s->buf_size); 7857504edf4SKevin Wolf if (s->buf == NULL) { 7867504edf4SKevin Wolf ret = -ENOMEM; 7877504edf4SKevin Wolf goto immediate_exit; 7887504edf4SKevin Wolf } 7897504edf4SKevin Wolf 790402a4741SPaolo Bonzini mirror_free_init(s); 791893f7ebaSPaolo Bonzini 79249efb1f5SDenis V. Lunev s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 79303544a6eSFam Zheng if (!s->is_none_mode) { 794c0b363adSDenis V. Lunev ret = mirror_dirty_init(s); 795c0b363adSDenis V. Lunev if (ret < 0 || block_job_is_cancelled(&s->common)) { 7964c0cbd6fSFam Zheng goto immediate_exit; 7974c0cbd6fSFam Zheng } 798893f7ebaSPaolo Bonzini } 799893f7ebaSPaolo Bonzini 800dc162c8eSFam Zheng assert(!s->dbi); 801dc162c8eSFam Zheng s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap, 0); 802893f7ebaSPaolo Bonzini for (;;) { 803cc8c9d6cSPaolo Bonzini uint64_t delay_ns = 0; 80449efb1f5SDenis V. Lunev int64_t cnt, delta; 805893f7ebaSPaolo Bonzini bool should_complete; 806893f7ebaSPaolo Bonzini 807bd48bde8SPaolo Bonzini if (s->ret < 0) { 808bd48bde8SPaolo Bonzini ret = s->ret; 809893f7ebaSPaolo Bonzini goto immediate_exit; 810893f7ebaSPaolo Bonzini } 811bd48bde8SPaolo Bonzini 812565ac01fSStefan Hajnoczi block_job_pause_point(&s->common); 813565ac01fSStefan Hajnoczi 81420dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 815b21c7652SMax Reitz /* s->common.offset contains the number of bytes already processed so 816b21c7652SMax Reitz * far, cnt is the number of dirty sectors remaining and 817b436982fSEric Blake * s->bytes_in_flight is the number of bytes currently being 818b21c7652SMax Reitz * processed; together those are the current total operation length */ 819b436982fSEric Blake s->common.len = s->common.offset + s->bytes_in_flight + 820b436982fSEric Blake cnt * BDRV_SECTOR_SIZE; 821bd48bde8SPaolo Bonzini 822bd48bde8SPaolo Bonzini /* Note that even when no rate limit is applied we need to yield 823a7282330SFam Zheng * periodically with no pending I/O so that bdrv_drain_all() returns. 824bd48bde8SPaolo Bonzini * We do so every SLICE_TIME nanoseconds, or when there is an error, 825bd48bde8SPaolo Bonzini * or when the source is clean, whichever comes first. 826bd48bde8SPaolo Bonzini */ 82749efb1f5SDenis V. Lunev delta = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->last_pause_ns; 82849efb1f5SDenis V. Lunev if (delta < SLICE_TIME && 829bd48bde8SPaolo Bonzini s->common.iostatus == BLOCK_DEVICE_IO_STATUS_OK) { 830cf56a3c6SDenis V. Lunev if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 || 831402a4741SPaolo Bonzini (cnt == 0 && s->in_flight > 0)) { 8325cb1a49eSEric Blake trace_mirror_yield(s, cnt * BDRV_SECTOR_SIZE, 8335cb1a49eSEric Blake s->buf_free_count, s->in_flight); 83421cd917fSFam Zheng mirror_wait_for_io(s); 835bd48bde8SPaolo Bonzini continue; 836bd48bde8SPaolo Bonzini } else if (cnt != 0) { 837cc8c9d6cSPaolo Bonzini delay_ns = mirror_iteration(s); 838893f7ebaSPaolo Bonzini } 839cc8c9d6cSPaolo Bonzini } 840893f7ebaSPaolo Bonzini 841893f7ebaSPaolo Bonzini should_complete = false; 842bd48bde8SPaolo Bonzini if (s->in_flight == 0 && cnt == 0) { 843893f7ebaSPaolo Bonzini trace_mirror_before_flush(s); 844bdffb31dSPaolo Bonzini if (!s->synced) { 845bdffb31dSPaolo Bonzini if (mirror_flush(s) < 0) { 846bdffb31dSPaolo Bonzini /* Go check s->ret. */ 847bdffb31dSPaolo Bonzini continue; 848893f7ebaSPaolo Bonzini } 849893f7ebaSPaolo Bonzini /* We're out of the streaming phase. From now on, if the job 850893f7ebaSPaolo Bonzini * is cancelled we will actually complete all pending I/O and 851893f7ebaSPaolo Bonzini * report completion. This way, block-job-cancel will leave 852893f7ebaSPaolo Bonzini * the target in a consistent state. 853893f7ebaSPaolo Bonzini */ 854bcada37bSWenchao Xia block_job_event_ready(&s->common); 855d63ffd87SPaolo Bonzini s->synced = true; 856d63ffd87SPaolo Bonzini } 857d63ffd87SPaolo Bonzini 858d63ffd87SPaolo Bonzini should_complete = s->should_complete || 859d63ffd87SPaolo Bonzini block_job_is_cancelled(&s->common); 86020dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 861893f7ebaSPaolo Bonzini } 862893f7ebaSPaolo Bonzini 863893f7ebaSPaolo Bonzini if (cnt == 0 && should_complete) { 864893f7ebaSPaolo Bonzini /* The dirty bitmap is not updated while operations are pending. 865893f7ebaSPaolo Bonzini * If we're about to exit, wait for pending operations before 866893f7ebaSPaolo Bonzini * calling bdrv_get_dirty_count(bs), or we may exit while the 867893f7ebaSPaolo Bonzini * source has dirty data to copy! 868893f7ebaSPaolo Bonzini * 869893f7ebaSPaolo Bonzini * Note that I/O can be submitted by the guest while 8709a0cec66SPaolo Bonzini * mirror_populate runs, so pause it now. Before deciding 8719a0cec66SPaolo Bonzini * whether to switch to target check one last time if I/O has 8729a0cec66SPaolo Bonzini * come in the meanwhile, and if not flush the data to disk. 873893f7ebaSPaolo Bonzini */ 8745cb1a49eSEric Blake trace_mirror_before_drain(s, cnt * BDRV_SECTOR_SIZE); 8759a0cec66SPaolo Bonzini 8769a0cec66SPaolo Bonzini bdrv_drained_begin(bs); 87720dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 878bdffb31dSPaolo Bonzini if (cnt > 0 || mirror_flush(s) < 0) { 8799a0cec66SPaolo Bonzini bdrv_drained_end(bs); 8809a0cec66SPaolo Bonzini continue; 8819a0cec66SPaolo Bonzini } 8829a0cec66SPaolo Bonzini 8839a0cec66SPaolo Bonzini /* The two disks are in sync. Exit and report successful 8849a0cec66SPaolo Bonzini * completion. 8859a0cec66SPaolo Bonzini */ 8869a0cec66SPaolo Bonzini assert(QLIST_EMPTY(&bs->tracked_requests)); 8879a0cec66SPaolo Bonzini s->common.cancelled = false; 8889a0cec66SPaolo Bonzini need_drain = false; 8899a0cec66SPaolo Bonzini break; 890893f7ebaSPaolo Bonzini } 891893f7ebaSPaolo Bonzini 892893f7ebaSPaolo Bonzini ret = 0; 8935cb1a49eSEric Blake trace_mirror_before_sleep(s, cnt * BDRV_SECTOR_SIZE, 8945cb1a49eSEric Blake s->synced, delay_ns); 895d63ffd87SPaolo Bonzini if (!s->synced) { 8967483d1e5SAlex Bligh block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); 897893f7ebaSPaolo Bonzini if (block_job_is_cancelled(&s->common)) { 898893f7ebaSPaolo Bonzini break; 899893f7ebaSPaolo Bonzini } 900893f7ebaSPaolo Bonzini } else if (!should_complete) { 901bd48bde8SPaolo Bonzini delay_ns = (s->in_flight == 0 && cnt == 0 ? SLICE_TIME : 0); 9027483d1e5SAlex Bligh block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns); 903893f7ebaSPaolo Bonzini } 90449efb1f5SDenis V. Lunev s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 905893f7ebaSPaolo Bonzini } 906893f7ebaSPaolo Bonzini 907893f7ebaSPaolo Bonzini immediate_exit: 908bd48bde8SPaolo Bonzini if (s->in_flight > 0) { 909bd48bde8SPaolo Bonzini /* We get here only if something went wrong. Either the job failed, 910bd48bde8SPaolo Bonzini * or it was cancelled prematurely so that we do not guarantee that 911bd48bde8SPaolo Bonzini * the target is a copy of the source. 912bd48bde8SPaolo Bonzini */ 913bd48bde8SPaolo Bonzini assert(ret < 0 || (!s->synced && block_job_is_cancelled(&s->common))); 9149a0cec66SPaolo Bonzini assert(need_drain); 915bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 916bd48bde8SPaolo Bonzini } 917bd48bde8SPaolo Bonzini 918bd48bde8SPaolo Bonzini assert(s->in_flight == 0); 9197191bf31SMarkus Armbruster qemu_vfree(s->buf); 920b812f671SPaolo Bonzini g_free(s->cow_bitmap); 921402a4741SPaolo Bonzini g_free(s->in_flight_bitmap); 922dc162c8eSFam Zheng bdrv_dirty_iter_free(s->dbi); 9235a7e7a0bSStefan Hajnoczi 9245a7e7a0bSStefan Hajnoczi data = g_malloc(sizeof(*data)); 9255a7e7a0bSStefan Hajnoczi data->ret = ret; 9269a0cec66SPaolo Bonzini 9279a0cec66SPaolo Bonzini if (need_drain) { 928e253f4b8SKevin Wolf bdrv_drained_begin(bs); 9299a0cec66SPaolo Bonzini } 9305a7e7a0bSStefan Hajnoczi block_job_defer_to_main_loop(&s->common, mirror_exit, data); 931893f7ebaSPaolo Bonzini } 932893f7ebaSPaolo Bonzini 933893f7ebaSPaolo Bonzini static void mirror_set_speed(BlockJob *job, int64_t speed, Error **errp) 934893f7ebaSPaolo Bonzini { 935893f7ebaSPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 936893f7ebaSPaolo Bonzini 937893f7ebaSPaolo Bonzini if (speed < 0) { 938c6bd8c70SMarkus Armbruster error_setg(errp, QERR_INVALID_PARAMETER, "speed"); 939893f7ebaSPaolo Bonzini return; 940893f7ebaSPaolo Bonzini } 941f3e4ce4aSEric Blake ratelimit_set_speed(&s->limit, speed, SLICE_TIME); 942893f7ebaSPaolo Bonzini } 943893f7ebaSPaolo Bonzini 944d63ffd87SPaolo Bonzini static void mirror_complete(BlockJob *job, Error **errp) 945d63ffd87SPaolo Bonzini { 946d63ffd87SPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 9474ef85a9cSKevin Wolf BlockDriverState *target; 948d63ffd87SPaolo Bonzini 949274fcceeSMax Reitz target = blk_bs(s->target); 950274fcceeSMax Reitz 951d63ffd87SPaolo Bonzini if (!s->synced) { 9529df229c3SAlberto Garcia error_setg(errp, "The active block job '%s' cannot be completed", 9539df229c3SAlberto Garcia job->id); 954d63ffd87SPaolo Bonzini return; 955d63ffd87SPaolo Bonzini } 956d63ffd87SPaolo Bonzini 957274fcceeSMax Reitz if (s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) { 958274fcceeSMax Reitz int ret; 959274fcceeSMax Reitz 960274fcceeSMax Reitz assert(!target->backing); 961274fcceeSMax Reitz ret = bdrv_open_backing_file(target, NULL, "backing", errp); 962274fcceeSMax Reitz if (ret < 0) { 963274fcceeSMax Reitz return; 964274fcceeSMax Reitz } 965274fcceeSMax Reitz } 966274fcceeSMax Reitz 96715d67298SChanglong Xie /* block all operations on to_replace bs */ 96809158f00SBenoît Canet if (s->replaces) { 9695a7e7a0bSStefan Hajnoczi AioContext *replace_aio_context; 9705a7e7a0bSStefan Hajnoczi 971e12f3784SWen Congyang s->to_replace = bdrv_find_node(s->replaces); 97209158f00SBenoît Canet if (!s->to_replace) { 973e12f3784SWen Congyang error_setg(errp, "Node name '%s' not found", s->replaces); 97409158f00SBenoît Canet return; 97509158f00SBenoît Canet } 97609158f00SBenoît Canet 9775a7e7a0bSStefan Hajnoczi replace_aio_context = bdrv_get_aio_context(s->to_replace); 9785a7e7a0bSStefan Hajnoczi aio_context_acquire(replace_aio_context); 9795a7e7a0bSStefan Hajnoczi 9804ef85a9cSKevin Wolf /* TODO Translate this into permission system. Current definition of 9814ef85a9cSKevin Wolf * GRAPH_MOD would require to request it for the parents; they might 9824ef85a9cSKevin Wolf * not even be BlockDriverStates, however, so a BdrvChild can't address 9834ef85a9cSKevin Wolf * them. May need redefinition of GRAPH_MOD. */ 98409158f00SBenoît Canet error_setg(&s->replace_blocker, 98509158f00SBenoît Canet "block device is in use by block-job-complete"); 98609158f00SBenoît Canet bdrv_op_block_all(s->to_replace, s->replace_blocker); 98709158f00SBenoît Canet bdrv_ref(s->to_replace); 9885a7e7a0bSStefan Hajnoczi 9895a7e7a0bSStefan Hajnoczi aio_context_release(replace_aio_context); 99009158f00SBenoît Canet } 99109158f00SBenoît Canet 992d63ffd87SPaolo Bonzini s->should_complete = true; 993751ebd76SFam Zheng block_job_enter(&s->common); 994d63ffd87SPaolo Bonzini } 995d63ffd87SPaolo Bonzini 996bae8196dSPaolo Bonzini static void mirror_pause(BlockJob *job) 997565ac01fSStefan Hajnoczi { 998565ac01fSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 999565ac01fSStefan Hajnoczi 1000bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 1001565ac01fSStefan Hajnoczi } 1002565ac01fSStefan Hajnoczi 1003565ac01fSStefan Hajnoczi static void mirror_attached_aio_context(BlockJob *job, AioContext *new_context) 1004565ac01fSStefan Hajnoczi { 1005565ac01fSStefan Hajnoczi MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 1006565ac01fSStefan Hajnoczi 1007565ac01fSStefan Hajnoczi blk_set_aio_context(s->target, new_context); 1008565ac01fSStefan Hajnoczi } 1009565ac01fSStefan Hajnoczi 1010bae8196dSPaolo Bonzini static void mirror_drain(BlockJob *job) 1011bae8196dSPaolo Bonzini { 1012bae8196dSPaolo Bonzini MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 1013bae8196dSPaolo Bonzini 1014bae8196dSPaolo Bonzini /* Need to keep a reference in case blk_drain triggers execution 1015bae8196dSPaolo Bonzini * of mirror_complete... 1016bae8196dSPaolo Bonzini */ 1017bae8196dSPaolo Bonzini if (s->target) { 1018bae8196dSPaolo Bonzini BlockBackend *target = s->target; 1019bae8196dSPaolo Bonzini blk_ref(target); 1020bae8196dSPaolo Bonzini blk_drain(target); 1021bae8196dSPaolo Bonzini blk_unref(target); 1022bae8196dSPaolo Bonzini } 1023bae8196dSPaolo Bonzini } 1024bae8196dSPaolo Bonzini 10253fc4b10aSFam Zheng static const BlockJobDriver mirror_job_driver = { 1026893f7ebaSPaolo Bonzini .instance_size = sizeof(MirrorBlockJob), 102779e14bf7SFam Zheng .job_type = BLOCK_JOB_TYPE_MIRROR, 1028893f7ebaSPaolo Bonzini .set_speed = mirror_set_speed, 1029a7815a76SJohn Snow .start = mirror_run, 1030d63ffd87SPaolo Bonzini .complete = mirror_complete, 1031565ac01fSStefan Hajnoczi .pause = mirror_pause, 1032565ac01fSStefan Hajnoczi .attached_aio_context = mirror_attached_aio_context, 1033bae8196dSPaolo Bonzini .drain = mirror_drain, 1034893f7ebaSPaolo Bonzini }; 1035893f7ebaSPaolo Bonzini 103603544a6eSFam Zheng static const BlockJobDriver commit_active_job_driver = { 103703544a6eSFam Zheng .instance_size = sizeof(MirrorBlockJob), 103803544a6eSFam Zheng .job_type = BLOCK_JOB_TYPE_COMMIT, 103903544a6eSFam Zheng .set_speed = mirror_set_speed, 1040a7815a76SJohn Snow .start = mirror_run, 104103544a6eSFam Zheng .complete = mirror_complete, 1042565ac01fSStefan Hajnoczi .pause = mirror_pause, 1043565ac01fSStefan Hajnoczi .attached_aio_context = mirror_attached_aio_context, 1044bae8196dSPaolo Bonzini .drain = mirror_drain, 104503544a6eSFam Zheng }; 104603544a6eSFam Zheng 10474ef85a9cSKevin Wolf static int coroutine_fn bdrv_mirror_top_preadv(BlockDriverState *bs, 10484ef85a9cSKevin Wolf uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags) 10494ef85a9cSKevin Wolf { 10504ef85a9cSKevin Wolf return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags); 10514ef85a9cSKevin Wolf } 10524ef85a9cSKevin Wolf 10534ef85a9cSKevin Wolf static int coroutine_fn bdrv_mirror_top_pwritev(BlockDriverState *bs, 10544ef85a9cSKevin Wolf uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags) 10554ef85a9cSKevin Wolf { 10564ef85a9cSKevin Wolf return bdrv_co_pwritev(bs->backing, offset, bytes, qiov, flags); 10574ef85a9cSKevin Wolf } 10584ef85a9cSKevin Wolf 10594ef85a9cSKevin Wolf static int coroutine_fn bdrv_mirror_top_flush(BlockDriverState *bs) 10604ef85a9cSKevin Wolf { 10614ef85a9cSKevin Wolf return bdrv_co_flush(bs->backing->bs); 10624ef85a9cSKevin Wolf } 10634ef85a9cSKevin Wolf 10644ef85a9cSKevin Wolf static int64_t coroutine_fn bdrv_mirror_top_get_block_status( 10654ef85a9cSKevin Wolf BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum, 10664ef85a9cSKevin Wolf BlockDriverState **file) 10674ef85a9cSKevin Wolf { 10684ef85a9cSKevin Wolf *pnum = nb_sectors; 10694ef85a9cSKevin Wolf *file = bs->backing->bs; 1070d5254033SEric Blake return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | 10714ef85a9cSKevin Wolf (sector_num << BDRV_SECTOR_BITS); 10724ef85a9cSKevin Wolf } 10734ef85a9cSKevin Wolf 10744ef85a9cSKevin Wolf static int coroutine_fn bdrv_mirror_top_pwrite_zeroes(BlockDriverState *bs, 1075f5a5ca79SManos Pitsidianakis int64_t offset, int bytes, BdrvRequestFlags flags) 10764ef85a9cSKevin Wolf { 1077f5a5ca79SManos Pitsidianakis return bdrv_co_pwrite_zeroes(bs->backing, offset, bytes, flags); 10784ef85a9cSKevin Wolf } 10794ef85a9cSKevin Wolf 10804ef85a9cSKevin Wolf static int coroutine_fn bdrv_mirror_top_pdiscard(BlockDriverState *bs, 1081f5a5ca79SManos Pitsidianakis int64_t offset, int bytes) 10824ef85a9cSKevin Wolf { 1083f5a5ca79SManos Pitsidianakis return bdrv_co_pdiscard(bs->backing->bs, offset, bytes); 10844ef85a9cSKevin Wolf } 10854ef85a9cSKevin Wolf 1086fd4a6493SKevin Wolf static void bdrv_mirror_top_refresh_filename(BlockDriverState *bs, QDict *opts) 1087fd4a6493SKevin Wolf { 1088fd4a6493SKevin Wolf bdrv_refresh_filename(bs->backing->bs); 1089fd4a6493SKevin Wolf pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), 1090fd4a6493SKevin Wolf bs->backing->bs->filename); 1091fd4a6493SKevin Wolf } 1092fd4a6493SKevin Wolf 10934ef85a9cSKevin Wolf static void bdrv_mirror_top_close(BlockDriverState *bs) 10944ef85a9cSKevin Wolf { 10954ef85a9cSKevin Wolf } 10964ef85a9cSKevin Wolf 10974ef85a9cSKevin Wolf static void bdrv_mirror_top_child_perm(BlockDriverState *bs, BdrvChild *c, 10984ef85a9cSKevin Wolf const BdrvChildRole *role, 10994ef85a9cSKevin Wolf uint64_t perm, uint64_t shared, 11004ef85a9cSKevin Wolf uint64_t *nperm, uint64_t *nshared) 11014ef85a9cSKevin Wolf { 11024ef85a9cSKevin Wolf /* Must be able to forward guest writes to the real image */ 11034ef85a9cSKevin Wolf *nperm = 0; 11044ef85a9cSKevin Wolf if (perm & BLK_PERM_WRITE) { 11054ef85a9cSKevin Wolf *nperm |= BLK_PERM_WRITE; 11064ef85a9cSKevin Wolf } 11074ef85a9cSKevin Wolf 11084ef85a9cSKevin Wolf *nshared = BLK_PERM_ALL; 11094ef85a9cSKevin Wolf } 11104ef85a9cSKevin Wolf 11114ef85a9cSKevin Wolf /* Dummy node that provides consistent read to its users without requiring it 11124ef85a9cSKevin Wolf * from its backing file and that allows writes on the backing file chain. */ 11134ef85a9cSKevin Wolf static BlockDriver bdrv_mirror_top = { 11144ef85a9cSKevin Wolf .format_name = "mirror_top", 11154ef85a9cSKevin Wolf .bdrv_co_preadv = bdrv_mirror_top_preadv, 11164ef85a9cSKevin Wolf .bdrv_co_pwritev = bdrv_mirror_top_pwritev, 11174ef85a9cSKevin Wolf .bdrv_co_pwrite_zeroes = bdrv_mirror_top_pwrite_zeroes, 11184ef85a9cSKevin Wolf .bdrv_co_pdiscard = bdrv_mirror_top_pdiscard, 11194ef85a9cSKevin Wolf .bdrv_co_flush = bdrv_mirror_top_flush, 11204ef85a9cSKevin Wolf .bdrv_co_get_block_status = bdrv_mirror_top_get_block_status, 1121fd4a6493SKevin Wolf .bdrv_refresh_filename = bdrv_mirror_top_refresh_filename, 11224ef85a9cSKevin Wolf .bdrv_close = bdrv_mirror_top_close, 11234ef85a9cSKevin Wolf .bdrv_child_perm = bdrv_mirror_top_child_perm, 11244ef85a9cSKevin Wolf }; 11254ef85a9cSKevin Wolf 112671aa9867SAlberto Garcia static void mirror_start_job(const char *job_id, BlockDriverState *bs, 112747970dfbSJohn Snow int creation_flags, BlockDriverState *target, 112847970dfbSJohn Snow const char *replaces, int64_t speed, 112947970dfbSJohn Snow uint32_t granularity, int64_t buf_size, 1130274fcceeSMax Reitz BlockMirrorBackingMode backing_mode, 113103544a6eSFam Zheng BlockdevOnError on_source_error, 1132b952b558SPaolo Bonzini BlockdevOnError on_target_error, 11330fc9f8eaSFam Zheng bool unmap, 1134097310b5SMarkus Armbruster BlockCompletionFunc *cb, 113551ccfa2dSFam Zheng void *opaque, 113603544a6eSFam Zheng const BlockJobDriver *driver, 1137b49f7eadSWen Congyang bool is_none_mode, BlockDriverState *base, 113851ccfa2dSFam Zheng bool auto_complete, const char *filter_node_name, 113951ccfa2dSFam Zheng Error **errp) 1140893f7ebaSPaolo Bonzini { 1141893f7ebaSPaolo Bonzini MirrorBlockJob *s; 11424ef85a9cSKevin Wolf BlockDriverState *mirror_top_bs; 11434ef85a9cSKevin Wolf bool target_graph_mod; 11444ef85a9cSKevin Wolf bool target_is_backing; 1145b2c2832cSKevin Wolf Error *local_err = NULL; 1146d7086422SKevin Wolf int ret; 1147893f7ebaSPaolo Bonzini 1148eee13dfeSPaolo Bonzini if (granularity == 0) { 1149341ebc2fSJohn Snow granularity = bdrv_get_default_bitmap_granularity(target); 1150eee13dfeSPaolo Bonzini } 1151eee13dfeSPaolo Bonzini 1152eee13dfeSPaolo Bonzini assert ((granularity & (granularity - 1)) == 0); 1153b436982fSEric Blake /* Granularity must be large enough for sector-based dirty bitmap */ 1154b436982fSEric Blake assert(granularity >= BDRV_SECTOR_SIZE); 1155eee13dfeSPaolo Bonzini 115648ac0a4dSWen Congyang if (buf_size < 0) { 115748ac0a4dSWen Congyang error_setg(errp, "Invalid parameter 'buf-size'"); 115848ac0a4dSWen Congyang return; 115948ac0a4dSWen Congyang } 116048ac0a4dSWen Congyang 116148ac0a4dSWen Congyang if (buf_size == 0) { 116248ac0a4dSWen Congyang buf_size = DEFAULT_MIRROR_BUF_SIZE; 116348ac0a4dSWen Congyang } 11645bc361b8SFam Zheng 11654ef85a9cSKevin Wolf /* In the case of active commit, add dummy driver to provide consistent 11664ef85a9cSKevin Wolf * reads on the top, while disabling it in the intermediate nodes, and make 11674ef85a9cSKevin Wolf * the backing chain writable. */ 11686cdbceb1SKevin Wolf mirror_top_bs = bdrv_new_open_driver(&bdrv_mirror_top, filter_node_name, 11696cdbceb1SKevin Wolf BDRV_O_RDWR, errp); 11704ef85a9cSKevin Wolf if (mirror_top_bs == NULL) { 1171893f7ebaSPaolo Bonzini return; 1172893f7ebaSPaolo Bonzini } 11734ef85a9cSKevin Wolf mirror_top_bs->total_sectors = bs->total_sectors; 117419dd29e8SFam Zheng bdrv_set_aio_context(mirror_top_bs, bdrv_get_aio_context(bs)); 1175893f7ebaSPaolo Bonzini 11764ef85a9cSKevin Wolf /* bdrv_append takes ownership of the mirror_top_bs reference, need to keep 11777a25fcd0SMax Reitz * it alive until block_job_create() succeeds even if bs has no parent. */ 11784ef85a9cSKevin Wolf bdrv_ref(mirror_top_bs); 11794ef85a9cSKevin Wolf bdrv_drained_begin(bs); 1180b2c2832cSKevin Wolf bdrv_append(mirror_top_bs, bs, &local_err); 11814ef85a9cSKevin Wolf bdrv_drained_end(bs); 11824ef85a9cSKevin Wolf 1183b2c2832cSKevin Wolf if (local_err) { 1184b2c2832cSKevin Wolf bdrv_unref(mirror_top_bs); 1185b2c2832cSKevin Wolf error_propagate(errp, local_err); 1186b2c2832cSKevin Wolf return; 1187b2c2832cSKevin Wolf } 1188b2c2832cSKevin Wolf 11894ef85a9cSKevin Wolf /* Make sure that the source is not resized while the job is running */ 11904ef85a9cSKevin Wolf s = block_job_create(job_id, driver, mirror_top_bs, 11914ef85a9cSKevin Wolf BLK_PERM_CONSISTENT_READ, 11924ef85a9cSKevin Wolf BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED | 11934ef85a9cSKevin Wolf BLK_PERM_WRITE | BLK_PERM_GRAPH_MOD, speed, 11944ef85a9cSKevin Wolf creation_flags, cb, opaque, errp); 11954ef85a9cSKevin Wolf if (!s) { 11964ef85a9cSKevin Wolf goto fail; 11974ef85a9cSKevin Wolf } 11987a25fcd0SMax Reitz /* The block job now has a reference to this node */ 11997a25fcd0SMax Reitz bdrv_unref(mirror_top_bs); 12007a25fcd0SMax Reitz 12014ef85a9cSKevin Wolf s->source = bs; 12024ef85a9cSKevin Wolf s->mirror_top_bs = mirror_top_bs; 12034ef85a9cSKevin Wolf 12044ef85a9cSKevin Wolf /* No resize for the target either; while the mirror is still running, a 12054ef85a9cSKevin Wolf * consistent read isn't necessarily possible. We could possibly allow 12064ef85a9cSKevin Wolf * writes and graph modifications, though it would likely defeat the 12074ef85a9cSKevin Wolf * purpose of a mirror, so leave them blocked for now. 12084ef85a9cSKevin Wolf * 12094ef85a9cSKevin Wolf * In the case of active commit, things look a bit different, though, 12104ef85a9cSKevin Wolf * because the target is an already populated backing file in active use. 12114ef85a9cSKevin Wolf * We can allow anything except resize there.*/ 12124ef85a9cSKevin Wolf target_is_backing = bdrv_chain_contains(bs, target); 12134ef85a9cSKevin Wolf target_graph_mod = (backing_mode != MIRROR_LEAVE_BACKING_CHAIN); 12144ef85a9cSKevin Wolf s->target = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE | 12154ef85a9cSKevin Wolf (target_graph_mod ? BLK_PERM_GRAPH_MOD : 0), 12164ef85a9cSKevin Wolf BLK_PERM_WRITE_UNCHANGED | 12174ef85a9cSKevin Wolf (target_is_backing ? BLK_PERM_CONSISTENT_READ | 12184ef85a9cSKevin Wolf BLK_PERM_WRITE | 12194ef85a9cSKevin Wolf BLK_PERM_GRAPH_MOD : 0)); 1220d7086422SKevin Wolf ret = blk_insert_bs(s->target, target, errp); 1221d7086422SKevin Wolf if (ret < 0) { 12224ef85a9cSKevin Wolf goto fail; 1223d7086422SKevin Wolf } 1224e253f4b8SKevin Wolf 122509158f00SBenoît Canet s->replaces = g_strdup(replaces); 1226b952b558SPaolo Bonzini s->on_source_error = on_source_error; 1227b952b558SPaolo Bonzini s->on_target_error = on_target_error; 122803544a6eSFam Zheng s->is_none_mode = is_none_mode; 1229274fcceeSMax Reitz s->backing_mode = backing_mode; 12305bc361b8SFam Zheng s->base = base; 1231eee13dfeSPaolo Bonzini s->granularity = granularity; 123248ac0a4dSWen Congyang s->buf_size = ROUND_UP(buf_size, granularity); 12330fc9f8eaSFam Zheng s->unmap = unmap; 1234b49f7eadSWen Congyang if (auto_complete) { 1235b49f7eadSWen Congyang s->should_complete = true; 1236b49f7eadSWen Congyang } 1237b812f671SPaolo Bonzini 12380db6e54aSFam Zheng s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); 1239b8afb520SFam Zheng if (!s->dirty_bitmap) { 124088f9d1b3SKevin Wolf goto fail; 1241b8afb520SFam Zheng } 124210f3cd15SAlberto Garcia 12434ef85a9cSKevin Wolf /* Required permissions are already taken with blk_new() */ 124476d554e2SKevin Wolf block_job_add_bdrv(&s->common, "target", target, 0, BLK_PERM_ALL, 124576d554e2SKevin Wolf &error_abort); 124676d554e2SKevin Wolf 1247f3ede4b0SAlberto Garcia /* In commit_active_start() all intermediate nodes disappear, so 1248f3ede4b0SAlberto Garcia * any jobs in them must be blocked */ 12494ef85a9cSKevin Wolf if (target_is_backing) { 1250f3ede4b0SAlberto Garcia BlockDriverState *iter; 1251f3ede4b0SAlberto Garcia for (iter = backing_bs(bs); iter != target; iter = backing_bs(iter)) { 12524ef85a9cSKevin Wolf /* XXX BLK_PERM_WRITE needs to be allowed so we don't block 12534ef85a9cSKevin Wolf * ourselves at s->base (if writes are blocked for a node, they are 12544ef85a9cSKevin Wolf * also blocked for its backing file). The other options would be a 12554ef85a9cSKevin Wolf * second filter driver above s->base (== target). */ 12564ef85a9cSKevin Wolf ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0, 12574ef85a9cSKevin Wolf BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE, 12584ef85a9cSKevin Wolf errp); 12594ef85a9cSKevin Wolf if (ret < 0) { 12604ef85a9cSKevin Wolf goto fail; 12614ef85a9cSKevin Wolf } 1262f3ede4b0SAlberto Garcia } 1263f3ede4b0SAlberto Garcia } 126410f3cd15SAlberto Garcia 12655ccac6f1SJohn Snow trace_mirror_start(bs, s, opaque); 12665ccac6f1SJohn Snow block_job_start(&s->common); 12674ef85a9cSKevin Wolf return; 12684ef85a9cSKevin Wolf 12694ef85a9cSKevin Wolf fail: 12704ef85a9cSKevin Wolf if (s) { 12717a25fcd0SMax Reitz /* Make sure this BDS does not go away until we have completed the graph 12727a25fcd0SMax Reitz * changes below */ 12737a25fcd0SMax Reitz bdrv_ref(mirror_top_bs); 12747a25fcd0SMax Reitz 12754ef85a9cSKevin Wolf g_free(s->replaces); 12764ef85a9cSKevin Wolf blk_unref(s->target); 127705b0d8e3SPaolo Bonzini block_job_early_fail(&s->common); 12784ef85a9cSKevin Wolf } 12794ef85a9cSKevin Wolf 1280c1cef672SFam Zheng bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL, 1281c1cef672SFam Zheng &error_abort); 12825fe31c25SKevin Wolf bdrv_replace_node(mirror_top_bs, backing_bs(mirror_top_bs), &error_abort); 12837a25fcd0SMax Reitz 12847a25fcd0SMax Reitz bdrv_unref(mirror_top_bs); 1285893f7ebaSPaolo Bonzini } 128603544a6eSFam Zheng 128771aa9867SAlberto Garcia void mirror_start(const char *job_id, BlockDriverState *bs, 128871aa9867SAlberto Garcia BlockDriverState *target, const char *replaces, 12895fba6c0eSJohn Snow int64_t speed, uint32_t granularity, int64_t buf_size, 1290274fcceeSMax Reitz MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, 1291274fcceeSMax Reitz BlockdevOnError on_source_error, 129203544a6eSFam Zheng BlockdevOnError on_target_error, 12936cdbceb1SKevin Wolf bool unmap, const char *filter_node_name, Error **errp) 129403544a6eSFam Zheng { 129503544a6eSFam Zheng bool is_none_mode; 129603544a6eSFam Zheng BlockDriverState *base; 129703544a6eSFam Zheng 12984b80ab2bSJohn Snow if (mode == MIRROR_SYNC_MODE_INCREMENTAL) { 12994b80ab2bSJohn Snow error_setg(errp, "Sync mode 'incremental' not supported"); 1300d58d8453SJohn Snow return; 1301d58d8453SJohn Snow } 130203544a6eSFam Zheng is_none_mode = mode == MIRROR_SYNC_MODE_NONE; 1303760e0063SKevin Wolf base = mode == MIRROR_SYNC_MODE_TOP ? backing_bs(bs) : NULL; 130447970dfbSJohn Snow mirror_start_job(job_id, bs, BLOCK_JOB_DEFAULT, target, replaces, 1305274fcceeSMax Reitz speed, granularity, buf_size, backing_mode, 130651ccfa2dSFam Zheng on_source_error, on_target_error, unmap, NULL, NULL, 13076cdbceb1SKevin Wolf &mirror_job_driver, is_none_mode, base, false, 130851ccfa2dSFam Zheng filter_node_name, errp); 130903544a6eSFam Zheng } 131003544a6eSFam Zheng 1311fd62c609SAlberto Garcia void commit_active_start(const char *job_id, BlockDriverState *bs, 131247970dfbSJohn Snow BlockDriverState *base, int creation_flags, 131347970dfbSJohn Snow int64_t speed, BlockdevOnError on_error, 13140db832f4SKevin Wolf const char *filter_node_name, 131578bbd910SFam Zheng BlockCompletionFunc *cb, void *opaque, 131678bbd910SFam Zheng bool auto_complete, Error **errp) 131703544a6eSFam Zheng { 13184da83585SJeff Cody int orig_base_flags; 1319cc67f4d1SJeff Cody Error *local_err = NULL; 13204da83585SJeff Cody 13214da83585SJeff Cody orig_base_flags = bdrv_get_flags(base); 13224da83585SJeff Cody 132320a63d2cSFam Zheng if (bdrv_reopen(base, bs->open_flags, errp)) { 132420a63d2cSFam Zheng return; 132520a63d2cSFam Zheng } 13264da83585SJeff Cody 132747970dfbSJohn Snow mirror_start_job(job_id, bs, creation_flags, base, NULL, speed, 0, 0, 132871aa9867SAlberto Garcia MIRROR_LEAVE_BACKING_CHAIN, 132951ccfa2dSFam Zheng on_error, on_error, true, cb, opaque, 13306cdbceb1SKevin Wolf &commit_active_job_driver, false, base, auto_complete, 133151ccfa2dSFam Zheng filter_node_name, &local_err); 13320fb6395cSMarkus Armbruster if (local_err) { 1333cc67f4d1SJeff Cody error_propagate(errp, local_err); 13344da83585SJeff Cody goto error_restore_flags; 13354da83585SJeff Cody } 13364da83585SJeff Cody 13374da83585SJeff Cody return; 13384da83585SJeff Cody 13394da83585SJeff Cody error_restore_flags: 13404da83585SJeff Cody /* ignore error and errp for bdrv_reopen, because we want to propagate 13414da83585SJeff Cody * the original error */ 13424da83585SJeff Cody bdrv_reopen(base, orig_base_flags, NULL); 13434da83585SJeff Cody return; 134403544a6eSFam Zheng } 1345