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" 1612aa4082SMax Reitz #include "qemu/coroutine.h" 171181e19aSMax Reitz #include "qemu/range.h" 18893f7ebaSPaolo Bonzini #include "trace.h" 19c87621eaSJohn Snow #include "block/blockjob_int.h" 20737e150eSPaolo Bonzini #include "block/block_int.h" 21e2c1c34fSMarkus Armbruster #include "block/dirty-bitmap.h" 22373340b2SMax Reitz #include "sysemu/block-backend.h" 23da34e65cSMarkus Armbruster #include "qapi/error.h" 24893f7ebaSPaolo Bonzini #include "qemu/ratelimit.h" 25b812f671SPaolo Bonzini #include "qemu/bitmap.h" 265df022cfSPeter Maydell #include "qemu/memalign.h" 27893f7ebaSPaolo Bonzini 28402a4741SPaolo Bonzini #define MAX_IN_FLIGHT 16 29b436982fSEric Blake #define MAX_IO_BYTES (1 << 20) /* 1 Mb */ 30b436982fSEric Blake #define DEFAULT_MIRROR_BUF_SIZE (MAX_IN_FLIGHT * MAX_IO_BYTES) 31402a4741SPaolo Bonzini 32402a4741SPaolo Bonzini /* The mirroring buffer is a list of granularity-sized chunks. 33402a4741SPaolo Bonzini * Free chunks are organized in a list. 34402a4741SPaolo Bonzini */ 35402a4741SPaolo Bonzini typedef struct MirrorBuffer { 36402a4741SPaolo Bonzini QSIMPLEQ_ENTRY(MirrorBuffer) next; 37402a4741SPaolo Bonzini } MirrorBuffer; 38893f7ebaSPaolo Bonzini 3912aa4082SMax Reitz typedef struct MirrorOp MirrorOp; 4012aa4082SMax Reitz 41893f7ebaSPaolo Bonzini typedef struct MirrorBlockJob { 42893f7ebaSPaolo Bonzini BlockJob common; 43e253f4b8SKevin Wolf BlockBackend *target; 444ef85a9cSKevin Wolf BlockDriverState *mirror_top_bs; 455bc361b8SFam Zheng BlockDriverState *base; 463f072a7fSMax Reitz BlockDriverState *base_overlay; 474ef85a9cSKevin Wolf 4809158f00SBenoît Canet /* The name of the graph node to replace */ 4909158f00SBenoît Canet char *replaces; 5009158f00SBenoît Canet /* The BDS to replace */ 5109158f00SBenoît Canet BlockDriverState *to_replace; 5209158f00SBenoît Canet /* Used to block operations on the drive-mirror-replace target */ 5309158f00SBenoît Canet Error *replace_blocker; 5403544a6eSFam Zheng bool is_none_mode; 55274fcceeSMax Reitz BlockMirrorBackingMode backing_mode; 56cdf3bc93SMax Reitz /* Whether the target image requires explicit zero-initialization */ 57cdf3bc93SMax Reitz bool zero_target; 58d06107adSMax Reitz MirrorCopyMode copy_mode; 59b952b558SPaolo Bonzini BlockdevOnError on_source_error, on_target_error; 60d06107adSMax Reitz /* Set when the target is synced (dirty bitmap is clean, nothing 61d06107adSMax Reitz * in flight) and the job is running in active mode */ 62d06107adSMax Reitz bool actively_synced; 63d63ffd87SPaolo Bonzini bool should_complete; 64eee13dfeSPaolo Bonzini int64_t granularity; 65b812f671SPaolo Bonzini size_t buf_size; 66b21c7652SMax Reitz int64_t bdev_length; 67b812f671SPaolo Bonzini unsigned long *cow_bitmap; 68e4654d2dSFam Zheng BdrvDirtyBitmap *dirty_bitmap; 69dc162c8eSFam Zheng BdrvDirtyBitmapIter *dbi; 70893f7ebaSPaolo Bonzini uint8_t *buf; 71402a4741SPaolo Bonzini QSIMPLEQ_HEAD(, MirrorBuffer) buf_free; 72402a4741SPaolo Bonzini int buf_free_count; 73bd48bde8SPaolo Bonzini 7449efb1f5SDenis V. Lunev uint64_t last_pause_ns; 75402a4741SPaolo Bonzini unsigned long *in_flight_bitmap; 761b8f7776SDenis V. Lunev unsigned in_flight; 77b436982fSEric Blake int64_t bytes_in_flight; 78b58deb34SPaolo Bonzini QTAILQ_HEAD(, MirrorOp) ops_in_flight; 79bd48bde8SPaolo Bonzini int ret; 800fc9f8eaSFam Zheng bool unmap; 81b436982fSEric Blake int target_cluster_size; 82e5b43573SFam Zheng int max_iov; 8390ab48ebSAnton Nefedov bool initial_zeroing_ongoing; 84d06107adSMax Reitz int in_active_write_counter; 85d69a879bSHanna Reitz int64_t active_write_bytes_in_flight; 86737efc1eSJohn Snow bool prepared; 875e771752SSergio Lopez bool in_drain; 88893f7ebaSPaolo Bonzini } MirrorBlockJob; 89893f7ebaSPaolo Bonzini 90429076e8SMax Reitz typedef struct MirrorBDSOpaque { 91429076e8SMax Reitz MirrorBlockJob *job; 92f94dc3b4SMax Reitz bool stop; 9353431b90SMax Reitz bool is_commit; 94429076e8SMax Reitz } MirrorBDSOpaque; 95429076e8SMax Reitz 9612aa4082SMax Reitz struct MirrorOp { 97bd48bde8SPaolo Bonzini MirrorBlockJob *s; 98bd48bde8SPaolo Bonzini QEMUIOVector qiov; 99b436982fSEric Blake int64_t offset; 100b436982fSEric Blake uint64_t bytes; 1012e1990b2SMax Reitz 1022e1990b2SMax Reitz /* The pointee is set by mirror_co_read(), mirror_co_zero(), and 1032e1990b2SMax Reitz * mirror_co_discard() before yielding for the first time */ 1042e1990b2SMax Reitz int64_t *bytes_handled; 10512aa4082SMax Reitz 1061181e19aSMax Reitz bool is_pseudo_op; 107d06107adSMax Reitz bool is_active_write; 108ce8cabbdSKevin Wolf bool is_in_flight; 10912aa4082SMax Reitz CoQueue waiting_requests; 110eed325b9SKevin Wolf Coroutine *co; 111d44dae1aSVladimir Sementsov-Ogievskiy MirrorOp *waiting_for_op; 11212aa4082SMax Reitz 11312aa4082SMax Reitz QTAILQ_ENTRY(MirrorOp) next; 11412aa4082SMax Reitz }; 115bd48bde8SPaolo Bonzini 1164295c5fcSMax Reitz typedef enum MirrorMethod { 1174295c5fcSMax Reitz MIRROR_METHOD_COPY, 1184295c5fcSMax Reitz MIRROR_METHOD_ZERO, 1194295c5fcSMax Reitz MIRROR_METHOD_DISCARD, 1204295c5fcSMax Reitz } MirrorMethod; 1214295c5fcSMax Reitz 122b952b558SPaolo Bonzini static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read, 123b952b558SPaolo Bonzini int error) 124b952b558SPaolo Bonzini { 125d06107adSMax Reitz s->actively_synced = false; 126b952b558SPaolo Bonzini if (read) { 12781e254dcSKevin Wolf return block_job_error_action(&s->common, s->on_source_error, 12881e254dcSKevin Wolf true, error); 129b952b558SPaolo Bonzini } else { 13081e254dcSKevin Wolf return block_job_error_action(&s->common, s->on_target_error, 13181e254dcSKevin Wolf false, error); 132b952b558SPaolo Bonzini } 133b952b558SPaolo Bonzini } 134b952b558SPaolo Bonzini 1351181e19aSMax Reitz static void coroutine_fn mirror_wait_on_conflicts(MirrorOp *self, 1361181e19aSMax Reitz MirrorBlockJob *s, 1371181e19aSMax Reitz uint64_t offset, 1381181e19aSMax Reitz uint64_t bytes) 1391181e19aSMax Reitz { 1401181e19aSMax Reitz uint64_t self_start_chunk = offset / s->granularity; 1411181e19aSMax Reitz uint64_t self_end_chunk = DIV_ROUND_UP(offset + bytes, s->granularity); 1421181e19aSMax Reitz uint64_t self_nb_chunks = self_end_chunk - self_start_chunk; 1431181e19aSMax Reitz 1441181e19aSMax Reitz while (find_next_bit(s->in_flight_bitmap, self_end_chunk, 1451181e19aSMax Reitz self_start_chunk) < self_end_chunk && 1461181e19aSMax Reitz s->ret >= 0) 1471181e19aSMax Reitz { 1481181e19aSMax Reitz MirrorOp *op; 1491181e19aSMax Reitz 1501181e19aSMax Reitz QTAILQ_FOREACH(op, &s->ops_in_flight, next) { 1511181e19aSMax Reitz uint64_t op_start_chunk = op->offset / s->granularity; 1521181e19aSMax Reitz uint64_t op_nb_chunks = DIV_ROUND_UP(op->offset + op->bytes, 1531181e19aSMax Reitz s->granularity) - 1541181e19aSMax Reitz op_start_chunk; 1551181e19aSMax Reitz 1561181e19aSMax Reitz if (op == self) { 1571181e19aSMax Reitz continue; 1581181e19aSMax Reitz } 1591181e19aSMax Reitz 1601181e19aSMax Reitz if (ranges_overlap(self_start_chunk, self_nb_chunks, 1611181e19aSMax Reitz op_start_chunk, op_nb_chunks)) 1621181e19aSMax Reitz { 16366fed30cSStefano Garzarella if (self) { 164d44dae1aSVladimir Sementsov-Ogievskiy /* 16566fed30cSStefano Garzarella * If the operation is already (indirectly) waiting for us, 16666fed30cSStefano Garzarella * or will wait for us as soon as it wakes up, then just go 16766fed30cSStefano Garzarella * on (instead of producing a deadlock in the former case). 168d44dae1aSVladimir Sementsov-Ogievskiy */ 169d44dae1aSVladimir Sementsov-Ogievskiy if (op->waiting_for_op) { 170d44dae1aSVladimir Sementsov-Ogievskiy continue; 171d44dae1aSVladimir Sementsov-Ogievskiy } 172d44dae1aSVladimir Sementsov-Ogievskiy 173d44dae1aSVladimir Sementsov-Ogievskiy self->waiting_for_op = op; 17466fed30cSStefano Garzarella } 17566fed30cSStefano Garzarella 1761181e19aSMax Reitz qemu_co_queue_wait(&op->waiting_requests, NULL); 17766fed30cSStefano Garzarella 17866fed30cSStefano Garzarella if (self) { 179d44dae1aSVladimir Sementsov-Ogievskiy self->waiting_for_op = NULL; 18066fed30cSStefano Garzarella } 18166fed30cSStefano Garzarella 1821181e19aSMax Reitz break; 1831181e19aSMax Reitz } 1841181e19aSMax Reitz } 1851181e19aSMax Reitz } 1861181e19aSMax Reitz } 1871181e19aSMax Reitz 1882e1990b2SMax Reitz static void coroutine_fn mirror_iteration_done(MirrorOp *op, int ret) 189bd48bde8SPaolo Bonzini { 190bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 191402a4741SPaolo Bonzini struct iovec *iov; 192bd48bde8SPaolo Bonzini int64_t chunk_num; 193b436982fSEric Blake int i, nb_chunks; 194bd48bde8SPaolo Bonzini 195b436982fSEric Blake trace_mirror_iteration_done(s, op->offset, op->bytes, ret); 196bd48bde8SPaolo Bonzini 197bd48bde8SPaolo Bonzini s->in_flight--; 198b436982fSEric Blake s->bytes_in_flight -= op->bytes; 199402a4741SPaolo Bonzini iov = op->qiov.iov; 200402a4741SPaolo Bonzini for (i = 0; i < op->qiov.niov; i++) { 201402a4741SPaolo Bonzini MirrorBuffer *buf = (MirrorBuffer *) iov[i].iov_base; 202402a4741SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&s->buf_free, buf, next); 203402a4741SPaolo Bonzini s->buf_free_count++; 204402a4741SPaolo Bonzini } 205402a4741SPaolo Bonzini 206b436982fSEric Blake chunk_num = op->offset / s->granularity; 207b436982fSEric Blake nb_chunks = DIV_ROUND_UP(op->bytes, s->granularity); 20812aa4082SMax Reitz 209402a4741SPaolo Bonzini bitmap_clear(s->in_flight_bitmap, chunk_num, nb_chunks); 21012aa4082SMax Reitz QTAILQ_REMOVE(&s->ops_in_flight, op, next); 211b21c7652SMax Reitz if (ret >= 0) { 212b21c7652SMax Reitz if (s->cow_bitmap) { 213bd48bde8SPaolo Bonzini bitmap_set(s->cow_bitmap, chunk_num, nb_chunks); 214bd48bde8SPaolo Bonzini } 21590ab48ebSAnton Nefedov if (!s->initial_zeroing_ongoing) { 21630a5c887SKevin Wolf job_progress_update(&s->common.job, op->bytes); 217b21c7652SMax Reitz } 21890ab48ebSAnton Nefedov } 2196df3bf8eSZhang Min qemu_iovec_destroy(&op->qiov); 2207b770c72SStefan Hajnoczi 22112aa4082SMax Reitz qemu_co_queue_restart_all(&op->waiting_requests); 22212aa4082SMax Reitz g_free(op); 2237b770c72SStefan Hajnoczi } 224bd48bde8SPaolo Bonzini 2252e1990b2SMax Reitz static void coroutine_fn mirror_write_complete(MirrorOp *op, int ret) 226bd48bde8SPaolo Bonzini { 227bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 228b9e413ddSPaolo Bonzini 229bd48bde8SPaolo Bonzini if (ret < 0) { 230bd48bde8SPaolo Bonzini BlockErrorAction action; 231bd48bde8SPaolo Bonzini 232e0d7f73eSEric Blake bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset, op->bytes); 233bd48bde8SPaolo Bonzini action = mirror_error_action(s, false, -ret); 234a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { 235bd48bde8SPaolo Bonzini s->ret = ret; 236bd48bde8SPaolo Bonzini } 237bd48bde8SPaolo Bonzini } 238d12ade57SVladimir Sementsov-Ogievskiy 239bd48bde8SPaolo Bonzini mirror_iteration_done(op, ret); 240bd48bde8SPaolo Bonzini } 241bd48bde8SPaolo Bonzini 2422e1990b2SMax Reitz static void coroutine_fn mirror_read_complete(MirrorOp *op, int ret) 243bd48bde8SPaolo Bonzini { 244bd48bde8SPaolo Bonzini MirrorBlockJob *s = op->s; 245b9e413ddSPaolo Bonzini 246bd48bde8SPaolo Bonzini if (ret < 0) { 247bd48bde8SPaolo Bonzini BlockErrorAction action; 248bd48bde8SPaolo Bonzini 249e0d7f73eSEric Blake bdrv_set_dirty_bitmap(s->dirty_bitmap, op->offset, op->bytes); 250bd48bde8SPaolo Bonzini action = mirror_error_action(s, true, -ret); 251a589569fSWenchao Xia if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) { 252bd48bde8SPaolo Bonzini s->ret = ret; 253bd48bde8SPaolo Bonzini } 254bd48bde8SPaolo Bonzini 255bd48bde8SPaolo Bonzini mirror_iteration_done(op, ret); 256d12ade57SVladimir Sementsov-Ogievskiy return; 257bd48bde8SPaolo Bonzini } 258d12ade57SVladimir Sementsov-Ogievskiy 259d12ade57SVladimir Sementsov-Ogievskiy ret = blk_co_pwritev(s->target, op->offset, op->qiov.size, &op->qiov, 0); 260d12ade57SVladimir Sementsov-Ogievskiy mirror_write_complete(op, ret); 261b9e413ddSPaolo Bonzini } 262bd48bde8SPaolo Bonzini 263782d97efSEric Blake /* Clip bytes relative to offset to not exceed end-of-file */ 264782d97efSEric Blake static inline int64_t mirror_clip_bytes(MirrorBlockJob *s, 265782d97efSEric Blake int64_t offset, 266782d97efSEric Blake int64_t bytes) 267782d97efSEric Blake { 268782d97efSEric Blake return MIN(bytes, s->bdev_length - offset); 269782d97efSEric Blake } 270782d97efSEric Blake 271782d97efSEric Blake /* Round offset and/or bytes to target cluster if COW is needed, and 272782d97efSEric Blake * return the offset of the adjusted tail against original. */ 27317ac39c3SPaolo Bonzini static int coroutine_fn mirror_cow_align(MirrorBlockJob *s, int64_t *offset, 274ae4cc877SEric Blake uint64_t *bytes) 275893f7ebaSPaolo Bonzini { 276e5b43573SFam Zheng bool need_cow; 277e5b43573SFam Zheng int ret = 0; 278782d97efSEric Blake int64_t align_offset = *offset; 2797cfd5275SEric Blake int64_t align_bytes = *bytes; 280782d97efSEric Blake int max_bytes = s->granularity * s->max_iov; 281893f7ebaSPaolo Bonzini 282782d97efSEric Blake need_cow = !test_bit(*offset / s->granularity, s->cow_bitmap); 283782d97efSEric Blake need_cow |= !test_bit((*offset + *bytes - 1) / s->granularity, 284e5b43573SFam Zheng s->cow_bitmap); 285e5b43573SFam Zheng if (need_cow) { 286782d97efSEric Blake bdrv_round_to_clusters(blk_bs(s->target), *offset, *bytes, 287782d97efSEric Blake &align_offset, &align_bytes); 2888f0720ecSPaolo Bonzini } 2898f0720ecSPaolo Bonzini 290782d97efSEric Blake if (align_bytes > max_bytes) { 291782d97efSEric Blake align_bytes = max_bytes; 292e5b43573SFam Zheng if (need_cow) { 293782d97efSEric Blake align_bytes = QEMU_ALIGN_DOWN(align_bytes, s->target_cluster_size); 294e5b43573SFam Zheng } 295e5b43573SFam Zheng } 296782d97efSEric Blake /* Clipping may result in align_bytes unaligned to chunk boundary, but 2974150ae60SFam Zheng * that doesn't matter because it's already the end of source image. */ 298782d97efSEric Blake align_bytes = mirror_clip_bytes(s, align_offset, align_bytes); 299402a4741SPaolo Bonzini 300782d97efSEric Blake ret = align_offset + align_bytes - (*offset + *bytes); 301782d97efSEric Blake *offset = align_offset; 302782d97efSEric Blake *bytes = align_bytes; 303e5b43573SFam Zheng assert(ret >= 0); 304e5b43573SFam Zheng return ret; 305e5b43573SFam Zheng } 306e5b43573SFam Zheng 307537c3d4fSStefan Hajnoczi static inline void coroutine_fn 308eb994912SHanna Reitz mirror_wait_for_free_in_flight_slot(MirrorBlockJob *s) 30921cd917fSFam Zheng { 31012aa4082SMax Reitz MirrorOp *op; 31112aa4082SMax Reitz 3121181e19aSMax Reitz QTAILQ_FOREACH(op, &s->ops_in_flight, next) { 313eb994912SHanna Reitz /* 314eb994912SHanna Reitz * Do not wait on pseudo ops, because it may in turn wait on 3151181e19aSMax Reitz * some other operation to start, which may in fact be the 3161181e19aSMax Reitz * caller of this function. Since there is only one pseudo op 3171181e19aSMax Reitz * at any given time, we will always find some real operation 318eb994912SHanna Reitz * to wait on. 319eb994912SHanna Reitz * Also, do not wait on active operations, because they do not 320eb994912SHanna Reitz * use up in-flight slots. 321eb994912SHanna Reitz */ 322eb994912SHanna Reitz if (!op->is_pseudo_op && op->is_in_flight && !op->is_active_write) { 32312aa4082SMax Reitz qemu_co_queue_wait(&op->waiting_requests, NULL); 3241181e19aSMax Reitz return; 3251181e19aSMax Reitz } 3261181e19aSMax Reitz } 3271181e19aSMax Reitz abort(); 32821cd917fSFam Zheng } 32921cd917fSFam Zheng 3302e1990b2SMax Reitz /* Perform a mirror copy operation. 3312e1990b2SMax Reitz * 3322e1990b2SMax Reitz * *op->bytes_handled is set to the number of bytes copied after and 3332e1990b2SMax Reitz * including offset, excluding any bytes copied prior to offset due 3342e1990b2SMax Reitz * to alignment. This will be op->bytes if no alignment is necessary, 3352e1990b2SMax Reitz * or (new_end - op->offset) if the tail is rounded up or down due to 336e5b43573SFam Zheng * alignment or buffer limit. 337402a4741SPaolo Bonzini */ 3382e1990b2SMax Reitz static void coroutine_fn mirror_co_read(void *opaque) 339e5b43573SFam Zheng { 3402e1990b2SMax Reitz MirrorOp *op = opaque; 3412e1990b2SMax Reitz MirrorBlockJob *s = op->s; 342ae4cc877SEric Blake int nb_chunks; 343ae4cc877SEric Blake uint64_t ret; 344ae4cc877SEric Blake uint64_t max_bytes; 345402a4741SPaolo Bonzini 346ae4cc877SEric Blake max_bytes = s->granularity * s->max_iov; 347e5b43573SFam Zheng 348e5b43573SFam Zheng /* We can only handle as much as buf_size at a time. */ 3492e1990b2SMax Reitz op->bytes = MIN(s->buf_size, MIN(max_bytes, op->bytes)); 3502e1990b2SMax Reitz assert(op->bytes); 3512e1990b2SMax Reitz assert(op->bytes < BDRV_REQUEST_MAX_BYTES); 3522e1990b2SMax Reitz *op->bytes_handled = op->bytes; 353e5b43573SFam Zheng 354e5b43573SFam Zheng if (s->cow_bitmap) { 3552e1990b2SMax Reitz *op->bytes_handled += mirror_cow_align(s, &op->offset, &op->bytes); 356e5b43573SFam Zheng } 3572e1990b2SMax Reitz /* Cannot exceed BDRV_REQUEST_MAX_BYTES + INT_MAX */ 3582e1990b2SMax Reitz assert(*op->bytes_handled <= UINT_MAX); 3592e1990b2SMax Reitz assert(op->bytes <= s->buf_size); 360ae4cc877SEric Blake /* The offset is granularity-aligned because: 361e5b43573SFam Zheng * 1) Caller passes in aligned values; 362e5b43573SFam Zheng * 2) mirror_cow_align is used only when target cluster is larger. */ 3632e1990b2SMax Reitz assert(QEMU_IS_ALIGNED(op->offset, s->granularity)); 364ae4cc877SEric Blake /* The range is sector-aligned, since bdrv_getlength() rounds up. */ 3652e1990b2SMax Reitz assert(QEMU_IS_ALIGNED(op->bytes, BDRV_SECTOR_SIZE)); 3662e1990b2SMax Reitz nb_chunks = DIV_ROUND_UP(op->bytes, s->granularity); 367e5b43573SFam Zheng 368e5b43573SFam Zheng while (s->buf_free_count < nb_chunks) { 3692e1990b2SMax Reitz trace_mirror_yield_in_flight(s, op->offset, s->in_flight); 3709178f4feSKevin Wolf mirror_wait_for_free_in_flight_slot(s); 371b812f671SPaolo Bonzini } 372b812f671SPaolo Bonzini 373402a4741SPaolo Bonzini /* Now make a QEMUIOVector taking enough granularity-sized chunks 374402a4741SPaolo Bonzini * from s->buf_free. 375402a4741SPaolo Bonzini */ 376402a4741SPaolo Bonzini qemu_iovec_init(&op->qiov, nb_chunks); 377402a4741SPaolo Bonzini while (nb_chunks-- > 0) { 378402a4741SPaolo Bonzini MirrorBuffer *buf = QSIMPLEQ_FIRST(&s->buf_free); 3792e1990b2SMax Reitz size_t remaining = op->bytes - op->qiov.size; 3805a0f6fd5SKevin Wolf 381402a4741SPaolo Bonzini QSIMPLEQ_REMOVE_HEAD(&s->buf_free, next); 382402a4741SPaolo Bonzini s->buf_free_count--; 3835a0f6fd5SKevin Wolf qemu_iovec_add(&op->qiov, buf, MIN(s->granularity, remaining)); 384402a4741SPaolo Bonzini } 385402a4741SPaolo Bonzini 386893f7ebaSPaolo Bonzini /* Copy the dirty cluster. */ 387bd48bde8SPaolo Bonzini s->in_flight++; 3882e1990b2SMax Reitz s->bytes_in_flight += op->bytes; 389ce8cabbdSKevin Wolf op->is_in_flight = true; 3902e1990b2SMax Reitz trace_mirror_one_iteration(s, op->offset, op->bytes); 391dcfb3bebSFam Zheng 392b9b10c35SKevin Wolf WITH_GRAPH_RDLOCK_GUARD() { 393138f9fffSMax Reitz ret = bdrv_co_preadv(s->mirror_top_bs->backing, op->offset, op->bytes, 394138f9fffSMax Reitz &op->qiov, 0); 395b9b10c35SKevin Wolf } 3962e1990b2SMax Reitz mirror_read_complete(op, ret); 397e5b43573SFam Zheng } 398e5b43573SFam Zheng 3992e1990b2SMax Reitz static void coroutine_fn mirror_co_zero(void *opaque) 400e5b43573SFam Zheng { 4012e1990b2SMax Reitz MirrorOp *op = opaque; 4022e1990b2SMax Reitz int ret; 403e5b43573SFam Zheng 4042e1990b2SMax Reitz op->s->in_flight++; 4052e1990b2SMax Reitz op->s->bytes_in_flight += op->bytes; 4062e1990b2SMax Reitz *op->bytes_handled = op->bytes; 407ce8cabbdSKevin Wolf op->is_in_flight = true; 408e5b43573SFam Zheng 4092e1990b2SMax Reitz ret = blk_co_pwrite_zeroes(op->s->target, op->offset, op->bytes, 4102e1990b2SMax Reitz op->s->unmap ? BDRV_REQ_MAY_UNMAP : 0); 4112e1990b2SMax Reitz mirror_write_complete(op, ret); 412e5b43573SFam Zheng } 4132e1990b2SMax Reitz 4142e1990b2SMax Reitz static void coroutine_fn mirror_co_discard(void *opaque) 4152e1990b2SMax Reitz { 4162e1990b2SMax Reitz MirrorOp *op = opaque; 4172e1990b2SMax Reitz int ret; 4182e1990b2SMax Reitz 4192e1990b2SMax Reitz op->s->in_flight++; 4202e1990b2SMax Reitz op->s->bytes_in_flight += op->bytes; 4212e1990b2SMax Reitz *op->bytes_handled = op->bytes; 422ce8cabbdSKevin Wolf op->is_in_flight = true; 4232e1990b2SMax Reitz 4242e1990b2SMax Reitz ret = blk_co_pdiscard(op->s->target, op->offset, op->bytes); 4252e1990b2SMax Reitz mirror_write_complete(op, ret); 426e5b43573SFam Zheng } 427e5b43573SFam Zheng 4284295c5fcSMax Reitz static unsigned mirror_perform(MirrorBlockJob *s, int64_t offset, 4294295c5fcSMax Reitz unsigned bytes, MirrorMethod mirror_method) 4304295c5fcSMax Reitz { 4312e1990b2SMax Reitz MirrorOp *op; 4322e1990b2SMax Reitz Coroutine *co; 4332e1990b2SMax Reitz int64_t bytes_handled = -1; 4342e1990b2SMax Reitz 4352e1990b2SMax Reitz op = g_new(MirrorOp, 1); 4362e1990b2SMax Reitz *op = (MirrorOp){ 4372e1990b2SMax Reitz .s = s, 4382e1990b2SMax Reitz .offset = offset, 4392e1990b2SMax Reitz .bytes = bytes, 4402e1990b2SMax Reitz .bytes_handled = &bytes_handled, 4412e1990b2SMax Reitz }; 44212aa4082SMax Reitz qemu_co_queue_init(&op->waiting_requests); 4432e1990b2SMax Reitz 4444295c5fcSMax Reitz switch (mirror_method) { 4454295c5fcSMax Reitz case MIRROR_METHOD_COPY: 4462e1990b2SMax Reitz co = qemu_coroutine_create(mirror_co_read, op); 4472e1990b2SMax Reitz break; 4484295c5fcSMax Reitz case MIRROR_METHOD_ZERO: 4492e1990b2SMax Reitz co = qemu_coroutine_create(mirror_co_zero, op); 4502e1990b2SMax Reitz break; 4514295c5fcSMax Reitz case MIRROR_METHOD_DISCARD: 4522e1990b2SMax Reitz co = qemu_coroutine_create(mirror_co_discard, op); 4532e1990b2SMax Reitz break; 4544295c5fcSMax Reitz default: 4554295c5fcSMax Reitz abort(); 4564295c5fcSMax Reitz } 457eed325b9SKevin Wolf op->co = co; 4582e1990b2SMax Reitz 45912aa4082SMax Reitz QTAILQ_INSERT_TAIL(&s->ops_in_flight, op, next); 4602e1990b2SMax Reitz qemu_coroutine_enter(co); 4612e1990b2SMax Reitz /* At this point, ownership of op has been moved to the coroutine 4622e1990b2SMax Reitz * and the object may already be freed */ 4632e1990b2SMax Reitz 4642e1990b2SMax Reitz /* Assert that this value has been set */ 4652e1990b2SMax Reitz assert(bytes_handled >= 0); 4662e1990b2SMax Reitz 4672e1990b2SMax Reitz /* Same assertion as in mirror_co_read() (and for mirror_co_read() 4682e1990b2SMax Reitz * and mirror_co_discard(), bytes_handled == op->bytes, which 4692e1990b2SMax Reitz * is the @bytes parameter given to this function) */ 4702e1990b2SMax Reitz assert(bytes_handled <= UINT_MAX); 4712e1990b2SMax Reitz return bytes_handled; 4724295c5fcSMax Reitz } 4734295c5fcSMax Reitz 474*018e5987SKevin Wolf static void coroutine_fn mirror_iteration(MirrorBlockJob *s) 475e5b43573SFam Zheng { 476138f9fffSMax Reitz BlockDriverState *source = s->mirror_top_bs->backing->bs; 4771181e19aSMax Reitz MirrorOp *pseudo_op; 4781181e19aSMax Reitz int64_t offset; 479e5b43573SFam Zheng /* At least the first dirty chunk is mirrored in one iteration. */ 480e5b43573SFam Zheng int nb_chunks = 1; 4814b5004d9SDenis V. Lunev bool write_zeroes_ok = bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)); 482b436982fSEric Blake int max_io_bytes = MAX(s->buf_size / MAX_IN_FLIGHT, MAX_IO_BYTES); 483e5b43573SFam Zheng 484b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_lock(s->dirty_bitmap); 485f798184cSEric Blake offset = bdrv_dirty_iter_next(s->dbi); 486fb2ef791SEric Blake if (offset < 0) { 487dc162c8eSFam Zheng bdrv_set_dirty_iter(s->dbi, 0); 488f798184cSEric Blake offset = bdrv_dirty_iter_next(s->dbi); 4899a46dba7SEric Blake trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap)); 490fb2ef791SEric Blake assert(offset >= 0); 491e5b43573SFam Zheng } 492b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_unlock(s->dirty_bitmap); 493e5b43573SFam Zheng 494d69a879bSHanna Reitz /* 495d69a879bSHanna Reitz * Wait for concurrent requests to @offset. The next loop will limit the 496d69a879bSHanna Reitz * copied area based on in_flight_bitmap so we only copy an area that does 497d69a879bSHanna Reitz * not overlap with concurrent in-flight requests. Still, we would like to 498d69a879bSHanna Reitz * copy something, so wait until there are at least no more requests to the 499d69a879bSHanna Reitz * very beginning of the area. 500d69a879bSHanna Reitz */ 5011181e19aSMax Reitz mirror_wait_on_conflicts(NULL, s, offset, 1); 5029c83625bSMax Reitz 503da01ff7fSKevin Wolf job_pause_point(&s->common.job); 504565ac01fSStefan Hajnoczi 505e5b43573SFam Zheng /* Find the number of consective dirty chunks following the first dirty 506e5b43573SFam Zheng * one, and wait for in flight requests in them. */ 507b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_lock(s->dirty_bitmap); 508fb2ef791SEric Blake while (nb_chunks * s->granularity < s->buf_size) { 509dc162c8eSFam Zheng int64_t next_dirty; 510fb2ef791SEric Blake int64_t next_offset = offset + nb_chunks * s->granularity; 511fb2ef791SEric Blake int64_t next_chunk = next_offset / s->granularity; 512fb2ef791SEric Blake if (next_offset >= s->bdev_length || 51328636b82SJohn Snow !bdrv_dirty_bitmap_get_locked(s->dirty_bitmap, next_offset)) { 514e5b43573SFam Zheng break; 515e5b43573SFam Zheng } 516e5b43573SFam Zheng if (test_bit(next_chunk, s->in_flight_bitmap)) { 517e5b43573SFam Zheng break; 518e5b43573SFam Zheng } 5199c83625bSMax Reitz 520f798184cSEric Blake next_dirty = bdrv_dirty_iter_next(s->dbi); 521fb2ef791SEric Blake if (next_dirty > next_offset || next_dirty < 0) { 522f27a2742SMax Reitz /* The bitmap iterator's cache is stale, refresh it */ 523715a74d8SEric Blake bdrv_set_dirty_iter(s->dbi, next_offset); 524f798184cSEric Blake next_dirty = bdrv_dirty_iter_next(s->dbi); 525f27a2742SMax Reitz } 526fb2ef791SEric Blake assert(next_dirty == next_offset); 527e5b43573SFam Zheng nb_chunks++; 528e5b43573SFam Zheng } 529e5b43573SFam Zheng 530e5b43573SFam Zheng /* Clear dirty bits before querying the block status, because 53131826642SEric Blake * calling bdrv_block_status_above could yield - if some blocks are 532e5b43573SFam Zheng * marked dirty in this window, we need to know. 533e5b43573SFam Zheng */ 534e0d7f73eSEric Blake bdrv_reset_dirty_bitmap_locked(s->dirty_bitmap, offset, 535e0d7f73eSEric Blake nb_chunks * s->granularity); 536b64bd51eSPaolo Bonzini bdrv_dirty_bitmap_unlock(s->dirty_bitmap); 537b64bd51eSPaolo Bonzini 5381181e19aSMax Reitz /* Before claiming an area in the in-flight bitmap, we have to 5391181e19aSMax Reitz * create a MirrorOp for it so that conflicting requests can wait 5401181e19aSMax Reitz * for it. mirror_perform() will create the real MirrorOps later, 5411181e19aSMax Reitz * for now we just create a pseudo operation that will wake up all 5421181e19aSMax Reitz * conflicting requests once all real operations have been 5431181e19aSMax Reitz * launched. */ 5441181e19aSMax Reitz pseudo_op = g_new(MirrorOp, 1); 5451181e19aSMax Reitz *pseudo_op = (MirrorOp){ 5461181e19aSMax Reitz .offset = offset, 5471181e19aSMax Reitz .bytes = nb_chunks * s->granularity, 5481181e19aSMax Reitz .is_pseudo_op = true, 5491181e19aSMax Reitz }; 5501181e19aSMax Reitz qemu_co_queue_init(&pseudo_op->waiting_requests); 5511181e19aSMax Reitz QTAILQ_INSERT_TAIL(&s->ops_in_flight, pseudo_op, next); 5521181e19aSMax Reitz 553fb2ef791SEric Blake bitmap_set(s->in_flight_bitmap, offset / s->granularity, nb_chunks); 554fb2ef791SEric Blake while (nb_chunks > 0 && offset < s->bdev_length) { 55531826642SEric Blake int ret; 5567cfd5275SEric Blake int64_t io_bytes; 557f3e4ce4aSEric Blake int64_t io_bytes_acct; 5584295c5fcSMax Reitz MirrorMethod mirror_method = MIRROR_METHOD_COPY; 559e5b43573SFam Zheng 560fb2ef791SEric Blake assert(!(offset % s->granularity)); 5617ff9579eSKevin Wolf WITH_GRAPH_RDLOCK_GUARD() { 56231826642SEric Blake ret = bdrv_block_status_above(source, NULL, offset, 56331826642SEric Blake nb_chunks * s->granularity, 56431826642SEric Blake &io_bytes, NULL, NULL); 5657ff9579eSKevin Wolf } 566e5b43573SFam Zheng if (ret < 0) { 567fb2ef791SEric Blake io_bytes = MIN(nb_chunks * s->granularity, max_io_bytes); 5680965a41eSVladimir Sementsov-Ogievskiy } else if (ret & BDRV_BLOCK_DATA) { 569fb2ef791SEric Blake io_bytes = MIN(io_bytes, max_io_bytes); 570e5b43573SFam Zheng } 571e5b43573SFam Zheng 572fb2ef791SEric Blake io_bytes -= io_bytes % s->granularity; 573fb2ef791SEric Blake if (io_bytes < s->granularity) { 574fb2ef791SEric Blake io_bytes = s->granularity; 575e5b43573SFam Zheng } else if (ret >= 0 && !(ret & BDRV_BLOCK_DATA)) { 576fb2ef791SEric Blake int64_t target_offset; 5777cfd5275SEric Blake int64_t target_bytes; 578a00e70c0SEmanuele Giuseppe Esposito WITH_GRAPH_RDLOCK_GUARD() { 579fb2ef791SEric Blake bdrv_round_to_clusters(blk_bs(s->target), offset, io_bytes, 580fb2ef791SEric Blake &target_offset, &target_bytes); 581a00e70c0SEmanuele Giuseppe Esposito } 582fb2ef791SEric Blake if (target_offset == offset && 583fb2ef791SEric Blake target_bytes == io_bytes) { 584e5b43573SFam Zheng mirror_method = ret & BDRV_BLOCK_ZERO ? 585e5b43573SFam Zheng MIRROR_METHOD_ZERO : 586e5b43573SFam Zheng MIRROR_METHOD_DISCARD; 587e5b43573SFam Zheng } 588e5b43573SFam Zheng } 589e5b43573SFam Zheng 590cf56a3c6SDenis V. Lunev while (s->in_flight >= MAX_IN_FLIGHT) { 591fb2ef791SEric Blake trace_mirror_yield_in_flight(s, offset, s->in_flight); 5929178f4feSKevin Wolf mirror_wait_for_free_in_flight_slot(s); 593cf56a3c6SDenis V. Lunev } 594cf56a3c6SDenis V. Lunev 595dbaa7b57SVladimir Sementsov-Ogievskiy if (s->ret < 0) { 5961181e19aSMax Reitz ret = 0; 5971181e19aSMax Reitz goto fail; 598dbaa7b57SVladimir Sementsov-Ogievskiy } 599dbaa7b57SVladimir Sementsov-Ogievskiy 600fb2ef791SEric Blake io_bytes = mirror_clip_bytes(s, offset, io_bytes); 6014295c5fcSMax Reitz io_bytes = mirror_perform(s, offset, io_bytes, mirror_method); 6024295c5fcSMax Reitz if (mirror_method != MIRROR_METHOD_COPY && write_zeroes_ok) { 603f3e4ce4aSEric Blake io_bytes_acct = 0; 6044b5004d9SDenis V. Lunev } else { 605fb2ef791SEric Blake io_bytes_acct = io_bytes; 6064b5004d9SDenis V. Lunev } 607fb2ef791SEric Blake assert(io_bytes); 608fb2ef791SEric Blake offset += io_bytes; 609fb2ef791SEric Blake nb_chunks -= DIV_ROUND_UP(io_bytes, s->granularity); 610*018e5987SKevin Wolf block_job_ratelimit_processed_bytes(&s->common, io_bytes_acct); 611dcfb3bebSFam Zheng } 6121181e19aSMax Reitz 6131181e19aSMax Reitz fail: 6141181e19aSMax Reitz QTAILQ_REMOVE(&s->ops_in_flight, pseudo_op, next); 6151181e19aSMax Reitz qemu_co_queue_restart_all(&pseudo_op->waiting_requests); 6161181e19aSMax Reitz g_free(pseudo_op); 617893f7ebaSPaolo Bonzini } 618b952b558SPaolo Bonzini 619402a4741SPaolo Bonzini static void mirror_free_init(MirrorBlockJob *s) 620402a4741SPaolo Bonzini { 621402a4741SPaolo Bonzini int granularity = s->granularity; 622402a4741SPaolo Bonzini size_t buf_size = s->buf_size; 623402a4741SPaolo Bonzini uint8_t *buf = s->buf; 624402a4741SPaolo Bonzini 625402a4741SPaolo Bonzini assert(s->buf_free_count == 0); 626402a4741SPaolo Bonzini QSIMPLEQ_INIT(&s->buf_free); 627402a4741SPaolo Bonzini while (buf_size != 0) { 628402a4741SPaolo Bonzini MirrorBuffer *cur = (MirrorBuffer *)buf; 629402a4741SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&s->buf_free, cur, next); 630402a4741SPaolo Bonzini s->buf_free_count++; 631402a4741SPaolo Bonzini buf_size -= granularity; 632402a4741SPaolo Bonzini buf += granularity; 633402a4741SPaolo Bonzini } 634402a4741SPaolo Bonzini } 635402a4741SPaolo Bonzini 636bae8196dSPaolo Bonzini /* This is also used for the .pause callback. There is no matching 637bae8196dSPaolo Bonzini * mirror_resume() because mirror_run() will begin iterating again 638bae8196dSPaolo Bonzini * when the job is resumed. 639bae8196dSPaolo Bonzini */ 640537c3d4fSStefan Hajnoczi static void coroutine_fn mirror_wait_for_all_io(MirrorBlockJob *s) 641bd48bde8SPaolo Bonzini { 642bd48bde8SPaolo Bonzini while (s->in_flight > 0) { 6439178f4feSKevin Wolf mirror_wait_for_free_in_flight_slot(s); 644bd48bde8SPaolo Bonzini } 645893f7ebaSPaolo Bonzini } 646893f7ebaSPaolo Bonzini 647737efc1eSJohn Snow /** 648737efc1eSJohn Snow * mirror_exit_common: handle both abort() and prepare() cases. 649737efc1eSJohn Snow * for .prepare, returns 0 on success and -errno on failure. 650737efc1eSJohn Snow * for .abort cases, denoted by abort = true, MUST return 0. 651737efc1eSJohn Snow */ 652737efc1eSJohn Snow static int mirror_exit_common(Job *job) 6535a7e7a0bSStefan Hajnoczi { 6541908a559SKevin Wolf MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); 6551908a559SKevin Wolf BlockJob *bjob = &s->common; 656f93c3addSMax Reitz MirrorBDSOpaque *bs_opaque; 6575a7e7a0bSStefan Hajnoczi AioContext *replace_aio_context = NULL; 658f93c3addSMax Reitz BlockDriverState *src; 659f93c3addSMax Reitz BlockDriverState *target_bs; 660f93c3addSMax Reitz BlockDriverState *mirror_top_bs; 66112fa4af6SKevin Wolf Error *local_err = NULL; 662737efc1eSJohn Snow bool abort = job->ret < 0; 663737efc1eSJohn Snow int ret = 0; 664737efc1eSJohn Snow 665737efc1eSJohn Snow if (s->prepared) { 666737efc1eSJohn Snow return 0; 667737efc1eSJohn Snow } 668737efc1eSJohn Snow s->prepared = true; 6693f09bfbcSKevin Wolf 670f93c3addSMax Reitz mirror_top_bs = s->mirror_top_bs; 671f93c3addSMax Reitz bs_opaque = mirror_top_bs->opaque; 672f93c3addSMax Reitz src = mirror_top_bs->backing->bs; 673f93c3addSMax Reitz target_bs = blk_bs(s->target); 674f93c3addSMax Reitz 675ef53dc09SAlberto Garcia if (bdrv_chain_contains(src, target_bs)) { 676ef53dc09SAlberto Garcia bdrv_unfreeze_backing_chain(mirror_top_bs, target_bs); 677ef53dc09SAlberto Garcia } 678ef53dc09SAlberto Garcia 6795deb6cbdSVladimir Sementsov-Ogievskiy bdrv_release_dirty_bitmap(s->dirty_bitmap); 6802119882cSPaolo Bonzini 6817b508f6bSJohn Snow /* Make sure that the source BDS doesn't go away during bdrv_replace_node, 6827b508f6bSJohn Snow * before we can call bdrv_drained_end */ 6833f09bfbcSKevin Wolf bdrv_ref(src); 6844ef85a9cSKevin Wolf bdrv_ref(mirror_top_bs); 6857d9fcb39SKevin Wolf bdrv_ref(target_bs); 6867d9fcb39SKevin Wolf 687bb0c9409SVladimir Sementsov-Ogievskiy /* 688bb0c9409SVladimir Sementsov-Ogievskiy * Remove target parent that still uses BLK_PERM_WRITE/RESIZE before 6897d9fcb39SKevin Wolf * inserting target_bs at s->to_replace, where we might not be able to get 69063c8ef28SKevin Wolf * these permissions. 691bb0c9409SVladimir Sementsov-Ogievskiy */ 6927d9fcb39SKevin Wolf blk_unref(s->target); 6937d9fcb39SKevin Wolf s->target = NULL; 6944ef85a9cSKevin Wolf 6954ef85a9cSKevin Wolf /* We don't access the source any more. Dropping any WRITE/RESIZE is 696d2da5e28SKevin Wolf * required before it could become a backing file of target_bs. Not having 697d2da5e28SKevin Wolf * these permissions any more means that we can't allow any new requests on 698d2da5e28SKevin Wolf * mirror_top_bs from now on, so keep it drained. */ 699d2da5e28SKevin Wolf bdrv_drained_begin(mirror_top_bs); 700f94dc3b4SMax Reitz bs_opaque->stop = true; 701f94dc3b4SMax Reitz bdrv_child_refresh_perms(mirror_top_bs, mirror_top_bs->backing, 7024ef85a9cSKevin Wolf &error_abort); 703737efc1eSJohn Snow if (!abort && s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) { 7044ef85a9cSKevin Wolf BlockDriverState *backing = s->is_none_mode ? src : s->base; 7053f072a7fSMax Reitz BlockDriverState *unfiltered_target = bdrv_skip_filters(target_bs); 7063f072a7fSMax Reitz 7073f072a7fSMax Reitz if (bdrv_cow_bs(unfiltered_target) != backing) { 7083f072a7fSMax Reitz bdrv_set_backing_hd(unfiltered_target, backing, &local_err); 70912fa4af6SKevin Wolf if (local_err) { 71012fa4af6SKevin Wolf error_report_err(local_err); 71166c8672dSVladimir Sementsov-Ogievskiy local_err = NULL; 7127b508f6bSJohn Snow ret = -EPERM; 71312fa4af6SKevin Wolf } 7144ef85a9cSKevin Wolf } 715c41f5b96SMax Reitz } else if (!abort && s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) { 716c41f5b96SMax Reitz assert(!bdrv_backing_chain_next(target_bs)); 717c41f5b96SMax Reitz ret = bdrv_open_backing_file(bdrv_skip_filters(target_bs), NULL, 718c41f5b96SMax Reitz "backing", &local_err); 719c41f5b96SMax Reitz if (ret < 0) { 720c41f5b96SMax Reitz error_report_err(local_err); 721c41f5b96SMax Reitz local_err = NULL; 722c41f5b96SMax Reitz } 7234ef85a9cSKevin Wolf } 7245a7e7a0bSStefan Hajnoczi 7255a7e7a0bSStefan Hajnoczi if (s->to_replace) { 7265a7e7a0bSStefan Hajnoczi replace_aio_context = bdrv_get_aio_context(s->to_replace); 7275a7e7a0bSStefan Hajnoczi aio_context_acquire(replace_aio_context); 7285a7e7a0bSStefan Hajnoczi } 7295a7e7a0bSStefan Hajnoczi 730737efc1eSJohn Snow if (s->should_complete && !abort) { 731737efc1eSJohn Snow BlockDriverState *to_replace = s->to_replace ?: src; 7321ba79388SAlberto Garcia bool ro = bdrv_is_read_only(to_replace); 73340365552SKevin Wolf 7341ba79388SAlberto Garcia if (ro != bdrv_is_read_only(target_bs)) { 7351ba79388SAlberto Garcia bdrv_reopen_set_read_only(target_bs, ro, NULL); 7365a7e7a0bSStefan Hajnoczi } 737b8804815SKevin Wolf 738b8804815SKevin Wolf /* The mirror job has no requests in flight any more, but we need to 739b8804815SKevin Wolf * drain potential other users of the BDS before changing the graph. */ 7405e771752SSergio Lopez assert(s->in_drain); 741e253f4b8SKevin Wolf bdrv_drained_begin(target_bs); 7426e9cc051SMax Reitz /* 7436e9cc051SMax Reitz * Cannot use check_to_replace_node() here, because that would 7446e9cc051SMax Reitz * check for an op blocker on @to_replace, and we have our own 7456e9cc051SMax Reitz * there. 746533c6e4eSKevin Wolf * 747533c6e4eSKevin Wolf * TODO Pull out the writer lock from bdrv_replace_node() to here 7486e9cc051SMax Reitz */ 749533c6e4eSKevin Wolf bdrv_graph_rdlock_main_loop(); 7506e9cc051SMax Reitz if (bdrv_recurse_can_replace(src, to_replace)) { 7515fe31c25SKevin Wolf bdrv_replace_node(to_replace, target_bs, &local_err); 7526e9cc051SMax Reitz } else { 7536e9cc051SMax Reitz error_setg(&local_err, "Can no longer replace '%s' by '%s', " 7546e9cc051SMax Reitz "because it can no longer be guaranteed that doing so " 7556e9cc051SMax Reitz "would not lead to an abrupt change of visible data", 7566e9cc051SMax Reitz to_replace->node_name, target_bs->node_name); 7576e9cc051SMax Reitz } 758533c6e4eSKevin Wolf bdrv_graph_rdunlock_main_loop(); 759e253f4b8SKevin Wolf bdrv_drained_end(target_bs); 7605fe31c25SKevin Wolf if (local_err) { 7615fe31c25SKevin Wolf error_report_err(local_err); 7627b508f6bSJohn Snow ret = -EPERM; 7635fe31c25SKevin Wolf } 7645a7e7a0bSStefan Hajnoczi } 7655a7e7a0bSStefan Hajnoczi if (s->to_replace) { 7665a7e7a0bSStefan Hajnoczi bdrv_op_unblock_all(s->to_replace, s->replace_blocker); 7675a7e7a0bSStefan Hajnoczi error_free(s->replace_blocker); 7685a7e7a0bSStefan Hajnoczi bdrv_unref(s->to_replace); 7695a7e7a0bSStefan Hajnoczi } 7705a7e7a0bSStefan Hajnoczi if (replace_aio_context) { 7715a7e7a0bSStefan Hajnoczi aio_context_release(replace_aio_context); 7725a7e7a0bSStefan Hajnoczi } 7735a7e7a0bSStefan Hajnoczi g_free(s->replaces); 7747d9fcb39SKevin Wolf bdrv_unref(target_bs); 7754ef85a9cSKevin Wolf 776f94dc3b4SMax Reitz /* 777f94dc3b4SMax Reitz * Remove the mirror filter driver from the graph. Before this, get rid of 7784ef85a9cSKevin Wolf * the blockers on the intermediate nodes so that the resulting state is 779f94dc3b4SMax Reitz * valid. 780f94dc3b4SMax Reitz */ 7811908a559SKevin Wolf block_job_remove_all_bdrv(bjob); 7823f072a7fSMax Reitz bdrv_replace_node(mirror_top_bs, mirror_top_bs->backing->bs, &error_abort); 7834ef85a9cSKevin Wolf 784429076e8SMax Reitz bs_opaque->job = NULL; 7854ef85a9cSKevin Wolf 786176c3699SFam Zheng bdrv_drained_end(src); 787d2da5e28SKevin Wolf bdrv_drained_end(mirror_top_bs); 7885e771752SSergio Lopez s->in_drain = false; 7894ef85a9cSKevin Wolf bdrv_unref(mirror_top_bs); 7903f09bfbcSKevin Wolf bdrv_unref(src); 7917b508f6bSJohn Snow 792737efc1eSJohn Snow return ret; 793737efc1eSJohn Snow } 794737efc1eSJohn Snow 795737efc1eSJohn Snow static int mirror_prepare(Job *job) 796737efc1eSJohn Snow { 797737efc1eSJohn Snow return mirror_exit_common(job); 798737efc1eSJohn Snow } 799737efc1eSJohn Snow 800737efc1eSJohn Snow static void mirror_abort(Job *job) 801737efc1eSJohn Snow { 802737efc1eSJohn Snow int ret = mirror_exit_common(job); 803737efc1eSJohn Snow assert(ret == 0); 8045a7e7a0bSStefan Hajnoczi } 8055a7e7a0bSStefan Hajnoczi 806537c3d4fSStefan Hajnoczi static void coroutine_fn mirror_throttle(MirrorBlockJob *s) 80749efb1f5SDenis V. Lunev { 80849efb1f5SDenis V. Lunev int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 80949efb1f5SDenis V. Lunev 81018bb6928SKevin Wolf if (now - s->last_pause_ns > BLOCK_JOB_SLICE_TIME) { 81149efb1f5SDenis V. Lunev s->last_pause_ns = now; 8125d43e86eSKevin Wolf job_sleep_ns(&s->common.job, 0); 81349efb1f5SDenis V. Lunev } else { 814da01ff7fSKevin Wolf job_pause_point(&s->common.job); 81549efb1f5SDenis V. Lunev } 81649efb1f5SDenis V. Lunev } 81749efb1f5SDenis V. Lunev 818c0b363adSDenis V. Lunev static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s) 819c0b363adSDenis V. Lunev { 82023ca459aSEric Blake int64_t offset; 821138f9fffSMax Reitz BlockDriverState *bs = s->mirror_top_bs->backing->bs; 822c0b363adSDenis V. Lunev BlockDriverState *target_bs = blk_bs(s->target); 82323ca459aSEric Blake int ret; 82451b0a488SEric Blake int64_t count; 825c0b363adSDenis V. Lunev 826cdf3bc93SMax Reitz if (s->zero_target) { 827c7c2769cSDenis V. Lunev if (!bdrv_can_write_zeroes_with_unmap(target_bs)) { 828e0d7f73eSEric Blake bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, s->bdev_length); 829b7d5062cSDenis V. Lunev return 0; 830b7d5062cSDenis V. Lunev } 831b7d5062cSDenis V. Lunev 83290ab48ebSAnton Nefedov s->initial_zeroing_ongoing = true; 83323ca459aSEric Blake for (offset = 0; offset < s->bdev_length; ) { 83423ca459aSEric Blake int bytes = MIN(s->bdev_length - offset, 83523ca459aSEric Blake QEMU_ALIGN_DOWN(INT_MAX, s->granularity)); 836c7c2769cSDenis V. Lunev 837c7c2769cSDenis V. Lunev mirror_throttle(s); 838c7c2769cSDenis V. Lunev 839daa7f2f9SKevin Wolf if (job_is_cancelled(&s->common.job)) { 84090ab48ebSAnton Nefedov s->initial_zeroing_ongoing = false; 841c7c2769cSDenis V. Lunev return 0; 842c7c2769cSDenis V. Lunev } 843c7c2769cSDenis V. Lunev 844c7c2769cSDenis V. Lunev if (s->in_flight >= MAX_IN_FLIGHT) { 84567adf4b3SEric Blake trace_mirror_yield(s, UINT64_MAX, s->buf_free_count, 84667adf4b3SEric Blake s->in_flight); 8479178f4feSKevin Wolf mirror_wait_for_free_in_flight_slot(s); 848c7c2769cSDenis V. Lunev continue; 849c7c2769cSDenis V. Lunev } 850c7c2769cSDenis V. Lunev 8514295c5fcSMax Reitz mirror_perform(s, offset, bytes, MIRROR_METHOD_ZERO); 85223ca459aSEric Blake offset += bytes; 853c7c2769cSDenis V. Lunev } 854c7c2769cSDenis V. Lunev 855bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 85690ab48ebSAnton Nefedov s->initial_zeroing_ongoing = false; 857c7c2769cSDenis V. Lunev } 858c7c2769cSDenis V. Lunev 859c0b363adSDenis V. Lunev /* First part, loop on the sectors and initialize the dirty bitmap. */ 86023ca459aSEric Blake for (offset = 0; offset < s->bdev_length; ) { 861c0b363adSDenis V. Lunev /* Just to make sure we are not exceeding int limit. */ 86223ca459aSEric Blake int bytes = MIN(s->bdev_length - offset, 86323ca459aSEric Blake QEMU_ALIGN_DOWN(INT_MAX, s->granularity)); 864c0b363adSDenis V. Lunev 865c0b363adSDenis V. Lunev mirror_throttle(s); 866c0b363adSDenis V. Lunev 867daa7f2f9SKevin Wolf if (job_is_cancelled(&s->common.job)) { 868c0b363adSDenis V. Lunev return 0; 869c0b363adSDenis V. Lunev } 870c0b363adSDenis V. Lunev 8717ff9579eSKevin Wolf WITH_GRAPH_RDLOCK_GUARD() { 8727ff9579eSKevin Wolf ret = bdrv_is_allocated_above(bs, s->base_overlay, true, offset, 8737ff9579eSKevin Wolf bytes, &count); 8747ff9579eSKevin Wolf } 875c0b363adSDenis V. Lunev if (ret < 0) { 876c0b363adSDenis V. Lunev return ret; 877c0b363adSDenis V. Lunev } 878c0b363adSDenis V. Lunev 87923ca459aSEric Blake assert(count); 880a92b1b06SEric Blake if (ret > 0) { 88123ca459aSEric Blake bdrv_set_dirty_bitmap(s->dirty_bitmap, offset, count); 882c0b363adSDenis V. Lunev } 88323ca459aSEric Blake offset += count; 884c0b363adSDenis V. Lunev } 885c0b363adSDenis V. Lunev return 0; 886c0b363adSDenis V. Lunev } 887c0b363adSDenis V. Lunev 888bdffb31dSPaolo Bonzini /* Called when going out of the streaming phase to flush the bulk of the 889bdffb31dSPaolo Bonzini * data to the medium, or just before completing. 890bdffb31dSPaolo Bonzini */ 89126bef102SPaolo Bonzini static int coroutine_fn mirror_flush(MirrorBlockJob *s) 892bdffb31dSPaolo Bonzini { 89326bef102SPaolo Bonzini int ret = blk_co_flush(s->target); 894bdffb31dSPaolo Bonzini if (ret < 0) { 895bdffb31dSPaolo Bonzini if (mirror_error_action(s, false, -ret) == BLOCK_ERROR_ACTION_REPORT) { 896bdffb31dSPaolo Bonzini s->ret = ret; 897bdffb31dSPaolo Bonzini } 898bdffb31dSPaolo Bonzini } 899bdffb31dSPaolo Bonzini return ret; 900bdffb31dSPaolo Bonzini } 901bdffb31dSPaolo Bonzini 902f67432a2SJohn Snow static int coroutine_fn mirror_run(Job *job, Error **errp) 903893f7ebaSPaolo Bonzini { 904f67432a2SJohn Snow MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); 905138f9fffSMax Reitz BlockDriverState *bs = s->mirror_top_bs->backing->bs; 90632125b14SKevin Wolf MirrorBDSOpaque *mirror_top_opaque = s->mirror_top_bs->opaque; 907e253f4b8SKevin Wolf BlockDriverState *target_bs = blk_bs(s->target); 9089a0cec66SPaolo Bonzini bool need_drain = true; 909d59cb66dSEmanuele Giuseppe Esposito BlockDeviceIoStatus iostatus; 910c0b363adSDenis V. Lunev int64_t length; 911e83dd680SKevin Wolf int64_t target_length; 912b812f671SPaolo Bonzini BlockDriverInfo bdi; 9131d33936eSJeff Cody char backing_filename[2]; /* we only need 2 characters because we are only 9141d33936eSJeff Cody checking for a NULL string */ 915893f7ebaSPaolo Bonzini int ret = 0; 916893f7ebaSPaolo Bonzini 917daa7f2f9SKevin Wolf if (job_is_cancelled(&s->common.job)) { 918893f7ebaSPaolo Bonzini goto immediate_exit; 919893f7ebaSPaolo Bonzini } 920893f7ebaSPaolo Bonzini 9218ab8140aSKevin Wolf bdrv_graph_co_rdlock(); 922c86422c5SEmanuele Giuseppe Esposito s->bdev_length = bdrv_co_getlength(bs); 9238ab8140aSKevin Wolf bdrv_graph_co_rdunlock(); 9248ab8140aSKevin Wolf 925b21c7652SMax Reitz if (s->bdev_length < 0) { 926b21c7652SMax Reitz ret = s->bdev_length; 927373df5b1SFam Zheng goto immediate_exit; 928becc347eSKevin Wolf } 929becc347eSKevin Wolf 930c86422c5SEmanuele Giuseppe Esposito target_length = blk_co_getlength(s->target); 931e83dd680SKevin Wolf if (target_length < 0) { 932e83dd680SKevin Wolf ret = target_length; 933becc347eSKevin Wolf goto immediate_exit; 934becc347eSKevin Wolf } 935becc347eSKevin Wolf 936e83dd680SKevin Wolf /* Active commit must resize the base image if its size differs from the 937e83dd680SKevin Wolf * active layer. */ 938e83dd680SKevin Wolf if (s->base == blk_bs(s->target)) { 939e83dd680SKevin Wolf if (s->bdev_length > target_length) { 94088276216SAlberto Faria ret = blk_co_truncate(s->target, s->bdev_length, false, 9418c6242b6SKevin Wolf PREALLOC_MODE_OFF, 0, NULL); 942becc347eSKevin Wolf if (ret < 0) { 943becc347eSKevin Wolf goto immediate_exit; 944becc347eSKevin Wolf } 945becc347eSKevin Wolf } 946e83dd680SKevin Wolf } else if (s->bdev_length != target_length) { 947e83dd680SKevin Wolf error_setg(errp, "Source and target image have different sizes"); 948e83dd680SKevin Wolf ret = -EINVAL; 949e83dd680SKevin Wolf goto immediate_exit; 950becc347eSKevin Wolf } 951becc347eSKevin Wolf 952becc347eSKevin Wolf if (s->bdev_length == 0) { 9532e1795b5SKevin Wolf /* Transition to the READY state and wait for complete. */ 9542e1795b5SKevin Wolf job_transition_to_ready(&s->common.job); 955d06107adSMax Reitz s->actively_synced = true; 95608b83bffSHanna Reitz while (!job_cancel_requested(&s->common.job) && !s->should_complete) { 957198c49ccSKevin Wolf job_yield(&s->common.job); 9589e48b025SFam Zheng } 9599e48b025SFam Zheng goto immediate_exit; 960893f7ebaSPaolo Bonzini } 961893f7ebaSPaolo Bonzini 962b21c7652SMax Reitz length = DIV_ROUND_UP(s->bdev_length, s->granularity); 963402a4741SPaolo Bonzini s->in_flight_bitmap = bitmap_new(length); 964402a4741SPaolo Bonzini 965b812f671SPaolo Bonzini /* If we have no backing file yet in the destination, we cannot let 966b812f671SPaolo Bonzini * the destination do COW. Instead, we copy sectors around the 967b812f671SPaolo Bonzini * dirty data if needed. We need a bitmap to do that. 968b812f671SPaolo Bonzini */ 969e253f4b8SKevin Wolf bdrv_get_backing_filename(target_bs, backing_filename, 970b812f671SPaolo Bonzini sizeof(backing_filename)); 971a00e70c0SEmanuele Giuseppe Esposito bdrv_graph_co_rdlock(); 9723d47eb0aSEmanuele Giuseppe Esposito if (!bdrv_co_get_info(target_bs, &bdi) && bdi.cluster_size) { 973b436982fSEric Blake s->target_cluster_size = bdi.cluster_size; 974b436982fSEric Blake } else { 975b436982fSEric Blake s->target_cluster_size = BDRV_SECTOR_SIZE; 976c3cc95bdSFam Zheng } 977a00e70c0SEmanuele Giuseppe Esposito bdrv_graph_co_rdunlock(); 9783f072a7fSMax Reitz if (backing_filename[0] && !bdrv_backing_chain_next(target_bs) && 979b436982fSEric Blake s->granularity < s->target_cluster_size) { 980b436982fSEric Blake s->buf_size = MAX(s->buf_size, s->target_cluster_size); 981b812f671SPaolo Bonzini s->cow_bitmap = bitmap_new(length); 982b812f671SPaolo Bonzini } 983e253f4b8SKevin Wolf s->max_iov = MIN(bs->bl.max_iov, target_bs->bl.max_iov); 984b812f671SPaolo Bonzini 9857504edf4SKevin Wolf s->buf = qemu_try_blockalign(bs, s->buf_size); 9867504edf4SKevin Wolf if (s->buf == NULL) { 9877504edf4SKevin Wolf ret = -ENOMEM; 9887504edf4SKevin Wolf goto immediate_exit; 9897504edf4SKevin Wolf } 9907504edf4SKevin Wolf 991402a4741SPaolo Bonzini mirror_free_init(s); 992893f7ebaSPaolo Bonzini 99349efb1f5SDenis V. Lunev s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 99403544a6eSFam Zheng if (!s->is_none_mode) { 995c0b363adSDenis V. Lunev ret = mirror_dirty_init(s); 996daa7f2f9SKevin Wolf if (ret < 0 || job_is_cancelled(&s->common.job)) { 9974c0cbd6fSFam Zheng goto immediate_exit; 9984c0cbd6fSFam Zheng } 999893f7ebaSPaolo Bonzini } 1000893f7ebaSPaolo Bonzini 100132125b14SKevin Wolf /* 100232125b14SKevin Wolf * Only now the job is fully initialised and mirror_top_bs should start 100332125b14SKevin Wolf * accessing it. 100432125b14SKevin Wolf */ 100532125b14SKevin Wolf mirror_top_opaque->job = s; 100632125b14SKevin Wolf 1007dc162c8eSFam Zheng assert(!s->dbi); 1008715a74d8SEric Blake s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap); 1009893f7ebaSPaolo Bonzini for (;;) { 101049efb1f5SDenis V. Lunev int64_t cnt, delta; 1011893f7ebaSPaolo Bonzini bool should_complete; 1012893f7ebaSPaolo Bonzini 1013bd48bde8SPaolo Bonzini if (s->ret < 0) { 1014bd48bde8SPaolo Bonzini ret = s->ret; 1015893f7ebaSPaolo Bonzini goto immediate_exit; 1016893f7ebaSPaolo Bonzini } 1017bd48bde8SPaolo Bonzini 1018da01ff7fSKevin Wolf job_pause_point(&s->common.job); 1019565ac01fSStefan Hajnoczi 10204feeec7eSHanna Reitz if (job_is_cancelled(&s->common.job)) { 10214feeec7eSHanna Reitz ret = 0; 10224feeec7eSHanna Reitz goto immediate_exit; 10234feeec7eSHanna Reitz } 10244feeec7eSHanna Reitz 102520dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 102605df8a6aSKevin Wolf /* cnt is the number of dirty bytes remaining and s->bytes_in_flight is 102705df8a6aSKevin Wolf * the number of bytes currently being processed; together those are 102805df8a6aSKevin Wolf * the current remaining operation length */ 1029d69a879bSHanna Reitz job_progress_set_remaining(&s->common.job, 1030d69a879bSHanna Reitz s->bytes_in_flight + cnt + 1031d69a879bSHanna Reitz s->active_write_bytes_in_flight); 1032bd48bde8SPaolo Bonzini 1033bd48bde8SPaolo Bonzini /* Note that even when no rate limit is applied we need to yield 1034a7282330SFam Zheng * periodically with no pending I/O so that bdrv_drain_all() returns. 103518bb6928SKevin Wolf * We do so every BLKOCK_JOB_SLICE_TIME nanoseconds, or when there is 103618bb6928SKevin Wolf * an error, or when the source is clean, whichever comes first. */ 103749efb1f5SDenis V. Lunev delta = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->last_pause_ns; 1038d59cb66dSEmanuele Giuseppe Esposito WITH_JOB_LOCK_GUARD() { 1039d59cb66dSEmanuele Giuseppe Esposito iostatus = s->common.iostatus; 1040d59cb66dSEmanuele Giuseppe Esposito } 104118bb6928SKevin Wolf if (delta < BLOCK_JOB_SLICE_TIME && 1042d59cb66dSEmanuele Giuseppe Esposito iostatus == BLOCK_DEVICE_IO_STATUS_OK) { 1043cf56a3c6SDenis V. Lunev if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 || 1044402a4741SPaolo Bonzini (cnt == 0 && s->in_flight > 0)) { 10459a46dba7SEric Blake trace_mirror_yield(s, cnt, s->buf_free_count, s->in_flight); 10469178f4feSKevin Wolf mirror_wait_for_free_in_flight_slot(s); 1047bd48bde8SPaolo Bonzini continue; 1048bd48bde8SPaolo Bonzini } else if (cnt != 0) { 1049*018e5987SKevin Wolf mirror_iteration(s); 1050893f7ebaSPaolo Bonzini } 1051cc8c9d6cSPaolo Bonzini } 1052893f7ebaSPaolo Bonzini 1053893f7ebaSPaolo Bonzini should_complete = false; 1054bd48bde8SPaolo Bonzini if (s->in_flight == 0 && cnt == 0) { 1055893f7ebaSPaolo Bonzini trace_mirror_before_flush(s); 105644716224SHanna Reitz if (!job_is_ready(&s->common.job)) { 1057bdffb31dSPaolo Bonzini if (mirror_flush(s) < 0) { 1058bdffb31dSPaolo Bonzini /* Go check s->ret. */ 1059bdffb31dSPaolo Bonzini continue; 1060893f7ebaSPaolo Bonzini } 1061893f7ebaSPaolo Bonzini /* We're out of the streaming phase. From now on, if the job 1062893f7ebaSPaolo Bonzini * is cancelled we will actually complete all pending I/O and 1063893f7ebaSPaolo Bonzini * report completion. This way, block-job-cancel will leave 1064893f7ebaSPaolo Bonzini * the target in a consistent state. 1065893f7ebaSPaolo Bonzini */ 10662e1795b5SKevin Wolf job_transition_to_ready(&s->common.job); 1067d06107adSMax Reitz if (s->copy_mode != MIRROR_COPY_MODE_BACKGROUND) { 1068d06107adSMax Reitz s->actively_synced = true; 1069d06107adSMax Reitz } 1070d63ffd87SPaolo Bonzini } 1071d63ffd87SPaolo Bonzini 1072d63ffd87SPaolo Bonzini should_complete = s->should_complete || 107308b83bffSHanna Reitz job_cancel_requested(&s->common.job); 107420dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 1075893f7ebaSPaolo Bonzini } 1076893f7ebaSPaolo Bonzini 1077893f7ebaSPaolo Bonzini if (cnt == 0 && should_complete) { 1078893f7ebaSPaolo Bonzini /* The dirty bitmap is not updated while operations are pending. 1079893f7ebaSPaolo Bonzini * If we're about to exit, wait for pending operations before 1080893f7ebaSPaolo Bonzini * calling bdrv_get_dirty_count(bs), or we may exit while the 1081893f7ebaSPaolo Bonzini * source has dirty data to copy! 1082893f7ebaSPaolo Bonzini * 1083893f7ebaSPaolo Bonzini * Note that I/O can be submitted by the guest while 10849a0cec66SPaolo Bonzini * mirror_populate runs, so pause it now. Before deciding 10859a0cec66SPaolo Bonzini * whether to switch to target check one last time if I/O has 10869a0cec66SPaolo Bonzini * come in the meanwhile, and if not flush the data to disk. 1087893f7ebaSPaolo Bonzini */ 10889a46dba7SEric Blake trace_mirror_before_drain(s, cnt); 10899a0cec66SPaolo Bonzini 10905e771752SSergio Lopez s->in_drain = true; 10919a0cec66SPaolo Bonzini bdrv_drained_begin(bs); 1092d69a879bSHanna Reitz 1093d69a879bSHanna Reitz /* Must be zero because we are drained */ 1094d69a879bSHanna Reitz assert(s->in_active_write_counter == 0); 1095d69a879bSHanna Reitz 109620dca810SJohn Snow cnt = bdrv_get_dirty_count(s->dirty_bitmap); 1097bdffb31dSPaolo Bonzini if (cnt > 0 || mirror_flush(s) < 0) { 10989a0cec66SPaolo Bonzini bdrv_drained_end(bs); 10995e771752SSergio Lopez s->in_drain = false; 11009a0cec66SPaolo Bonzini continue; 11019a0cec66SPaolo Bonzini } 11029a0cec66SPaolo Bonzini 11039a0cec66SPaolo Bonzini /* The two disks are in sync. Exit and report successful 11049a0cec66SPaolo Bonzini * completion. 11059a0cec66SPaolo Bonzini */ 11069a0cec66SPaolo Bonzini assert(QLIST_EMPTY(&bs->tracked_requests)); 11079a0cec66SPaolo Bonzini need_drain = false; 11089a0cec66SPaolo Bonzini break; 1109893f7ebaSPaolo Bonzini } 1110893f7ebaSPaolo Bonzini 111144716224SHanna Reitz if (job_is_ready(&s->common.job) && !should_complete) { 1112*018e5987SKevin Wolf if (s->in_flight == 0 && cnt == 0) { 111344716224SHanna Reitz trace_mirror_before_sleep(s, cnt, job_is_ready(&s->common.job), 1114*018e5987SKevin Wolf BLOCK_JOB_SLICE_TIME); 1115*018e5987SKevin Wolf job_sleep_ns(&s->common.job, BLOCK_JOB_SLICE_TIME); 1116*018e5987SKevin Wolf } 1117*018e5987SKevin Wolf } else { 1118*018e5987SKevin Wolf block_job_ratelimit_sleep(&s->common); 1119*018e5987SKevin Wolf } 112049efb1f5SDenis V. Lunev s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); 1121893f7ebaSPaolo Bonzini } 1122893f7ebaSPaolo Bonzini 1123893f7ebaSPaolo Bonzini immediate_exit: 1124bd48bde8SPaolo Bonzini if (s->in_flight > 0) { 1125bd48bde8SPaolo Bonzini /* We get here only if something went wrong. Either the job failed, 1126bd48bde8SPaolo Bonzini * or it was cancelled prematurely so that we do not guarantee that 1127bd48bde8SPaolo Bonzini * the target is a copy of the source. 1128bd48bde8SPaolo Bonzini */ 112908b83bffSHanna Reitz assert(ret < 0 || job_is_cancelled(&s->common.job)); 11309a0cec66SPaolo Bonzini assert(need_drain); 1131bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 1132bd48bde8SPaolo Bonzini } 1133bd48bde8SPaolo Bonzini 1134bd48bde8SPaolo Bonzini assert(s->in_flight == 0); 11357191bf31SMarkus Armbruster qemu_vfree(s->buf); 1136b812f671SPaolo Bonzini g_free(s->cow_bitmap); 1137402a4741SPaolo Bonzini g_free(s->in_flight_bitmap); 1138dc162c8eSFam Zheng bdrv_dirty_iter_free(s->dbi); 11395a7e7a0bSStefan Hajnoczi 11409a0cec66SPaolo Bonzini if (need_drain) { 11415e771752SSergio Lopez s->in_drain = true; 1142e253f4b8SKevin Wolf bdrv_drained_begin(bs); 11439a0cec66SPaolo Bonzini } 1144f67432a2SJohn Snow 1145f67432a2SJohn Snow return ret; 1146893f7ebaSPaolo Bonzini } 1147893f7ebaSPaolo Bonzini 11483453d972SKevin Wolf static void mirror_complete(Job *job, Error **errp) 1149d63ffd87SPaolo Bonzini { 11503453d972SKevin Wolf MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); 1151274fcceeSMax Reitz 115244716224SHanna Reitz if (!job_is_ready(job)) { 11539df229c3SAlberto Garcia error_setg(errp, "The active block job '%s' cannot be completed", 11543453d972SKevin Wolf job->id); 1155d63ffd87SPaolo Bonzini return; 1156d63ffd87SPaolo Bonzini } 1157d63ffd87SPaolo Bonzini 115815d67298SChanglong Xie /* block all operations on to_replace bs */ 115909158f00SBenoît Canet if (s->replaces) { 11605a7e7a0bSStefan Hajnoczi AioContext *replace_aio_context; 11615a7e7a0bSStefan Hajnoczi 1162e12f3784SWen Congyang s->to_replace = bdrv_find_node(s->replaces); 116309158f00SBenoît Canet if (!s->to_replace) { 1164e12f3784SWen Congyang error_setg(errp, "Node name '%s' not found", s->replaces); 116509158f00SBenoît Canet return; 116609158f00SBenoît Canet } 116709158f00SBenoît Canet 11685a7e7a0bSStefan Hajnoczi replace_aio_context = bdrv_get_aio_context(s->to_replace); 11695a7e7a0bSStefan Hajnoczi aio_context_acquire(replace_aio_context); 11705a7e7a0bSStefan Hajnoczi 117164631f36SVladimir Sementsov-Ogievskiy /* TODO Translate this into child freeze system. */ 117209158f00SBenoît Canet error_setg(&s->replace_blocker, 117309158f00SBenoît Canet "block device is in use by block-job-complete"); 117409158f00SBenoît Canet bdrv_op_block_all(s->to_replace, s->replace_blocker); 117509158f00SBenoît Canet bdrv_ref(s->to_replace); 11765a7e7a0bSStefan Hajnoczi 11775a7e7a0bSStefan Hajnoczi aio_context_release(replace_aio_context); 117809158f00SBenoît Canet } 117909158f00SBenoît Canet 1180d63ffd87SPaolo Bonzini s->should_complete = true; 118100769414SMax Reitz 118200769414SMax Reitz /* If the job is paused, it will be re-entered when it is resumed */ 1183279ac06eSEmanuele Giuseppe Esposito WITH_JOB_LOCK_GUARD() { 118400769414SMax Reitz if (!job->paused) { 1185279ac06eSEmanuele Giuseppe Esposito job_enter_cond_locked(job, NULL); 1186279ac06eSEmanuele Giuseppe Esposito } 1187d63ffd87SPaolo Bonzini } 118800769414SMax Reitz } 1189d63ffd87SPaolo Bonzini 1190537c3d4fSStefan Hajnoczi static void coroutine_fn mirror_pause(Job *job) 1191565ac01fSStefan Hajnoczi { 1192da01ff7fSKevin Wolf MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); 1193565ac01fSStefan Hajnoczi 1194bae8196dSPaolo Bonzini mirror_wait_for_all_io(s); 1195565ac01fSStefan Hajnoczi } 1196565ac01fSStefan Hajnoczi 119789bd0305SKevin Wolf static bool mirror_drained_poll(BlockJob *job) 119889bd0305SKevin Wolf { 119989bd0305SKevin Wolf MirrorBlockJob *s = container_of(job, MirrorBlockJob, common); 12005e771752SSergio Lopez 12015e771752SSergio Lopez /* If the job isn't paused nor cancelled, we can't be sure that it won't 12025e771752SSergio Lopez * issue more requests. We make an exception if we've reached this point 12035e771752SSergio Lopez * from one of our own drain sections, to avoid a deadlock waiting for 12045e771752SSergio Lopez * ourselves. 12055e771752SSergio Lopez */ 1206279ac06eSEmanuele Giuseppe Esposito WITH_JOB_LOCK_GUARD() { 1207279ac06eSEmanuele Giuseppe Esposito if (!s->common.job.paused && !job_is_cancelled_locked(&job->job) 1208279ac06eSEmanuele Giuseppe Esposito && !s->in_drain) { 12095e771752SSergio Lopez return true; 12105e771752SSergio Lopez } 1211279ac06eSEmanuele Giuseppe Esposito } 12125e771752SSergio Lopez 121389bd0305SKevin Wolf return !!s->in_flight; 121489bd0305SKevin Wolf } 121589bd0305SKevin Wolf 121673895f38SHanna Reitz static bool mirror_cancel(Job *job, bool force) 1217521ff8b7SVladimir Sementsov-Ogievskiy { 1218521ff8b7SVladimir Sementsov-Ogievskiy MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); 1219521ff8b7SVladimir Sementsov-Ogievskiy BlockDriverState *target = blk_bs(s->target); 1220521ff8b7SVladimir Sementsov-Ogievskiy 122173895f38SHanna Reitz /* 122273895f38SHanna Reitz * Before the job is READY, we treat any cancellation like a 122373895f38SHanna Reitz * force-cancellation. 122473895f38SHanna Reitz */ 122573895f38SHanna Reitz force = force || !job_is_ready(job); 122673895f38SHanna Reitz 122773895f38SHanna Reitz if (force) { 1228521ff8b7SVladimir Sementsov-Ogievskiy bdrv_cancel_in_flight(target); 1229521ff8b7SVladimir Sementsov-Ogievskiy } 123073895f38SHanna Reitz return force; 123173895f38SHanna Reitz } 123273895f38SHanna Reitz 123373895f38SHanna Reitz static bool commit_active_cancel(Job *job, bool force) 123473895f38SHanna Reitz { 123573895f38SHanna Reitz /* Same as above in mirror_cancel() */ 123673895f38SHanna Reitz return force || !job_is_ready(job); 12379c785cd7SVladimir Sementsov-Ogievskiy } 1238521ff8b7SVladimir Sementsov-Ogievskiy 12393fc4b10aSFam Zheng static const BlockJobDriver mirror_job_driver = { 124033e9e9bdSKevin Wolf .job_driver = { 1241893f7ebaSPaolo Bonzini .instance_size = sizeof(MirrorBlockJob), 12428e4c8700SKevin Wolf .job_type = JOB_TYPE_MIRROR, 124380fa2c75SKevin Wolf .free = block_job_free, 1244b15de828SKevin Wolf .user_resume = block_job_user_resume, 1245f67432a2SJohn Snow .run = mirror_run, 1246737efc1eSJohn Snow .prepare = mirror_prepare, 1247737efc1eSJohn Snow .abort = mirror_abort, 1248565ac01fSStefan Hajnoczi .pause = mirror_pause, 1249da01ff7fSKevin Wolf .complete = mirror_complete, 1250521ff8b7SVladimir Sementsov-Ogievskiy .cancel = mirror_cancel, 12513453d972SKevin Wolf }, 125289bd0305SKevin Wolf .drained_poll = mirror_drained_poll, 1253893f7ebaSPaolo Bonzini }; 1254893f7ebaSPaolo Bonzini 125503544a6eSFam Zheng static const BlockJobDriver commit_active_job_driver = { 125633e9e9bdSKevin Wolf .job_driver = { 125703544a6eSFam Zheng .instance_size = sizeof(MirrorBlockJob), 12588e4c8700SKevin Wolf .job_type = JOB_TYPE_COMMIT, 125980fa2c75SKevin Wolf .free = block_job_free, 1260b15de828SKevin Wolf .user_resume = block_job_user_resume, 1261f67432a2SJohn Snow .run = mirror_run, 1262737efc1eSJohn Snow .prepare = mirror_prepare, 1263737efc1eSJohn Snow .abort = mirror_abort, 1264565ac01fSStefan Hajnoczi .pause = mirror_pause, 1265da01ff7fSKevin Wolf .complete = mirror_complete, 126673895f38SHanna Reitz .cancel = commit_active_cancel, 12673453d972SKevin Wolf }, 126889bd0305SKevin Wolf .drained_poll = mirror_drained_poll, 126903544a6eSFam Zheng }; 127003544a6eSFam Zheng 1271537c3d4fSStefan Hajnoczi static void coroutine_fn 1272537c3d4fSStefan Hajnoczi do_sync_target_write(MirrorBlockJob *job, MirrorMethod method, 1273d06107adSMax Reitz uint64_t offset, uint64_t bytes, 1274d06107adSMax Reitz QEMUIOVector *qiov, int flags) 1275d06107adSMax Reitz { 1276d06107adSMax Reitz int ret; 1277dbdf699cSVladimir Sementsov-Ogievskiy size_t qiov_offset = 0; 1278dbdf699cSVladimir Sementsov-Ogievskiy int64_t bitmap_offset, bitmap_end; 1279d06107adSMax Reitz 1280dbdf699cSVladimir Sementsov-Ogievskiy if (!QEMU_IS_ALIGNED(offset, job->granularity) && 1281dbdf699cSVladimir Sementsov-Ogievskiy bdrv_dirty_bitmap_get(job->dirty_bitmap, offset)) 1282dbdf699cSVladimir Sementsov-Ogievskiy { 1283dbdf699cSVladimir Sementsov-Ogievskiy /* 1284dbdf699cSVladimir Sementsov-Ogievskiy * Dirty unaligned padding: ignore it. 1285dbdf699cSVladimir Sementsov-Ogievskiy * 1286dbdf699cSVladimir Sementsov-Ogievskiy * Reasoning: 1287dbdf699cSVladimir Sementsov-Ogievskiy * 1. If we copy it, we can't reset corresponding bit in 1288dbdf699cSVladimir Sementsov-Ogievskiy * dirty_bitmap as there may be some "dirty" bytes still not 1289dbdf699cSVladimir Sementsov-Ogievskiy * copied. 1290dbdf699cSVladimir Sementsov-Ogievskiy * 2. It's already dirty, so skipping it we don't diverge mirror 1291dbdf699cSVladimir Sementsov-Ogievskiy * progress. 1292dbdf699cSVladimir Sementsov-Ogievskiy * 1293dbdf699cSVladimir Sementsov-Ogievskiy * Note, that because of this, guest write may have no contribution 1294dbdf699cSVladimir Sementsov-Ogievskiy * into mirror converge, but that's not bad, as we have background 1295dbdf699cSVladimir Sementsov-Ogievskiy * process of mirroring. If under some bad circumstances (high guest 1296dbdf699cSVladimir Sementsov-Ogievskiy * IO load) background process starve, we will not converge anyway, 1297dbdf699cSVladimir Sementsov-Ogievskiy * even if each write will contribute, as guest is not guaranteed to 1298dbdf699cSVladimir Sementsov-Ogievskiy * rewrite the whole disk. 1299dbdf699cSVladimir Sementsov-Ogievskiy */ 1300dbdf699cSVladimir Sementsov-Ogievskiy qiov_offset = QEMU_ALIGN_UP(offset, job->granularity) - offset; 1301dbdf699cSVladimir Sementsov-Ogievskiy if (bytes <= qiov_offset) { 1302dbdf699cSVladimir Sementsov-Ogievskiy /* nothing to do after shrink */ 1303dbdf699cSVladimir Sementsov-Ogievskiy return; 1304dbdf699cSVladimir Sementsov-Ogievskiy } 1305dbdf699cSVladimir Sementsov-Ogievskiy offset += qiov_offset; 1306dbdf699cSVladimir Sementsov-Ogievskiy bytes -= qiov_offset; 1307dbdf699cSVladimir Sementsov-Ogievskiy } 1308dbdf699cSVladimir Sementsov-Ogievskiy 1309dbdf699cSVladimir Sementsov-Ogievskiy if (!QEMU_IS_ALIGNED(offset + bytes, job->granularity) && 1310dbdf699cSVladimir Sementsov-Ogievskiy bdrv_dirty_bitmap_get(job->dirty_bitmap, offset + bytes - 1)) 1311dbdf699cSVladimir Sementsov-Ogievskiy { 1312dbdf699cSVladimir Sementsov-Ogievskiy uint64_t tail = (offset + bytes) % job->granularity; 1313dbdf699cSVladimir Sementsov-Ogievskiy 1314dbdf699cSVladimir Sementsov-Ogievskiy if (bytes <= tail) { 1315dbdf699cSVladimir Sementsov-Ogievskiy /* nothing to do after shrink */ 1316dbdf699cSVladimir Sementsov-Ogievskiy return; 1317dbdf699cSVladimir Sementsov-Ogievskiy } 1318dbdf699cSVladimir Sementsov-Ogievskiy bytes -= tail; 1319dbdf699cSVladimir Sementsov-Ogievskiy } 1320dbdf699cSVladimir Sementsov-Ogievskiy 1321dbdf699cSVladimir Sementsov-Ogievskiy /* 1322dbdf699cSVladimir Sementsov-Ogievskiy * Tails are either clean or shrunk, so for bitmap resetting 1323dbdf699cSVladimir Sementsov-Ogievskiy * we safely align the range down. 1324dbdf699cSVladimir Sementsov-Ogievskiy */ 1325dbdf699cSVladimir Sementsov-Ogievskiy bitmap_offset = QEMU_ALIGN_UP(offset, job->granularity); 1326dbdf699cSVladimir Sementsov-Ogievskiy bitmap_end = QEMU_ALIGN_DOWN(offset + bytes, job->granularity); 1327dbdf699cSVladimir Sementsov-Ogievskiy if (bitmap_offset < bitmap_end) { 1328dbdf699cSVladimir Sementsov-Ogievskiy bdrv_reset_dirty_bitmap(job->dirty_bitmap, bitmap_offset, 1329dbdf699cSVladimir Sementsov-Ogievskiy bitmap_end - bitmap_offset); 1330dbdf699cSVladimir Sementsov-Ogievskiy } 1331d06107adSMax Reitz 13325c511ac3SVladimir Sementsov-Ogievskiy job_progress_increase_remaining(&job->common.job, bytes); 1333d69a879bSHanna Reitz job->active_write_bytes_in_flight += bytes; 1334d06107adSMax Reitz 1335d06107adSMax Reitz switch (method) { 1336d06107adSMax Reitz case MIRROR_METHOD_COPY: 1337dbdf699cSVladimir Sementsov-Ogievskiy ret = blk_co_pwritev_part(job->target, offset, bytes, 1338dbdf699cSVladimir Sementsov-Ogievskiy qiov, qiov_offset, flags); 1339d06107adSMax Reitz break; 1340d06107adSMax Reitz 1341d06107adSMax Reitz case MIRROR_METHOD_ZERO: 1342d06107adSMax Reitz assert(!qiov); 13435c511ac3SVladimir Sementsov-Ogievskiy ret = blk_co_pwrite_zeroes(job->target, offset, bytes, flags); 1344d06107adSMax Reitz break; 1345d06107adSMax Reitz 1346d06107adSMax Reitz case MIRROR_METHOD_DISCARD: 1347d06107adSMax Reitz assert(!qiov); 13485c511ac3SVladimir Sementsov-Ogievskiy ret = blk_co_pdiscard(job->target, offset, bytes); 1349d06107adSMax Reitz break; 1350d06107adSMax Reitz 1351d06107adSMax Reitz default: 1352d06107adSMax Reitz abort(); 1353d06107adSMax Reitz } 1354d06107adSMax Reitz 1355d69a879bSHanna Reitz job->active_write_bytes_in_flight -= bytes; 1356d06107adSMax Reitz if (ret >= 0) { 13575c511ac3SVladimir Sementsov-Ogievskiy job_progress_update(&job->common.job, bytes); 1358d06107adSMax Reitz } else { 1359d06107adSMax Reitz BlockErrorAction action; 1360d06107adSMax Reitz 1361dbdf699cSVladimir Sementsov-Ogievskiy /* 1362dbdf699cSVladimir Sementsov-Ogievskiy * We failed, so we should mark dirty the whole area, aligned up. 1363dbdf699cSVladimir Sementsov-Ogievskiy * Note that we don't care about shrunk tails if any: they were dirty 1364dbdf699cSVladimir Sementsov-Ogievskiy * at function start, and they must be still dirty, as we've locked 1365dbdf699cSVladimir Sementsov-Ogievskiy * the region for in-flight op. 1366dbdf699cSVladimir Sementsov-Ogievskiy */ 1367dbdf699cSVladimir Sementsov-Ogievskiy bitmap_offset = QEMU_ALIGN_DOWN(offset, job->granularity); 1368dbdf699cSVladimir Sementsov-Ogievskiy bitmap_end = QEMU_ALIGN_UP(offset + bytes, job->granularity); 1369dbdf699cSVladimir Sementsov-Ogievskiy bdrv_set_dirty_bitmap(job->dirty_bitmap, bitmap_offset, 1370dbdf699cSVladimir Sementsov-Ogievskiy bitmap_end - bitmap_offset); 1371d06107adSMax Reitz job->actively_synced = false; 1372d06107adSMax Reitz 1373d06107adSMax Reitz action = mirror_error_action(job, false, -ret); 1374d06107adSMax Reitz if (action == BLOCK_ERROR_ACTION_REPORT) { 1375d06107adSMax Reitz if (!job->ret) { 1376d06107adSMax Reitz job->ret = ret; 1377d06107adSMax Reitz } 1378d06107adSMax Reitz } 1379d06107adSMax Reitz } 1380d06107adSMax Reitz } 1381d06107adSMax Reitz 1382d06107adSMax Reitz static MirrorOp *coroutine_fn active_write_prepare(MirrorBlockJob *s, 1383d06107adSMax Reitz uint64_t offset, 1384d06107adSMax Reitz uint64_t bytes) 1385d06107adSMax Reitz { 1386d06107adSMax Reitz MirrorOp *op; 1387d06107adSMax Reitz uint64_t start_chunk = offset / s->granularity; 1388d06107adSMax Reitz uint64_t end_chunk = DIV_ROUND_UP(offset + bytes, s->granularity); 1389d06107adSMax Reitz 1390d06107adSMax Reitz op = g_new(MirrorOp, 1); 1391d06107adSMax Reitz *op = (MirrorOp){ 1392d06107adSMax Reitz .s = s, 1393d06107adSMax Reitz .offset = offset, 1394d06107adSMax Reitz .bytes = bytes, 1395d06107adSMax Reitz .is_active_write = true, 1396ce8cabbdSKevin Wolf .is_in_flight = true, 1397ead3f1bfSVladimir Sementsov-Ogievskiy .co = qemu_coroutine_self(), 1398d06107adSMax Reitz }; 1399d06107adSMax Reitz qemu_co_queue_init(&op->waiting_requests); 1400d06107adSMax Reitz QTAILQ_INSERT_TAIL(&s->ops_in_flight, op, next); 1401d06107adSMax Reitz 1402d06107adSMax Reitz s->in_active_write_counter++; 1403d06107adSMax Reitz 1404d69a879bSHanna Reitz /* 1405d69a879bSHanna Reitz * Wait for concurrent requests affecting the area. If there are already 1406d69a879bSHanna Reitz * running requests that are copying off now-to-be stale data in the area, 1407d69a879bSHanna Reitz * we must wait for them to finish before we begin writing fresh data to the 1408d69a879bSHanna Reitz * target so that the write operations appear in the correct order. 1409d69a879bSHanna Reitz * Note that background requests (see mirror_iteration()) in contrast only 1410d69a879bSHanna Reitz * wait for conflicting requests at the start of the dirty area, and then 1411d69a879bSHanna Reitz * (based on the in_flight_bitmap) truncate the area to copy so it will not 1412d69a879bSHanna Reitz * conflict with any requests beyond that. For active writes, however, we 1413d69a879bSHanna Reitz * cannot truncate that area. The request from our parent must be blocked 1414d69a879bSHanna Reitz * until the area is copied in full. Therefore, we must wait for the whole 1415d69a879bSHanna Reitz * area to become free of concurrent requests. 1416d69a879bSHanna Reitz */ 1417d06107adSMax Reitz mirror_wait_on_conflicts(op, s, offset, bytes); 1418d06107adSMax Reitz 1419d06107adSMax Reitz bitmap_set(s->in_flight_bitmap, start_chunk, end_chunk - start_chunk); 1420d06107adSMax Reitz 1421d06107adSMax Reitz return op; 1422d06107adSMax Reitz } 1423d06107adSMax Reitz 14249c93652dSKevin Wolf static void coroutine_fn GRAPH_RDLOCK active_write_settle(MirrorOp *op) 1425d06107adSMax Reitz { 1426d06107adSMax Reitz uint64_t start_chunk = op->offset / op->s->granularity; 1427d06107adSMax Reitz uint64_t end_chunk = DIV_ROUND_UP(op->offset + op->bytes, 1428d06107adSMax Reitz op->s->granularity); 1429d06107adSMax Reitz 1430d06107adSMax Reitz if (!--op->s->in_active_write_counter && op->s->actively_synced) { 1431d06107adSMax Reitz BdrvChild *source = op->s->mirror_top_bs->backing; 1432d06107adSMax Reitz 1433d06107adSMax Reitz if (QLIST_FIRST(&source->bs->parents) == source && 1434d06107adSMax Reitz QLIST_NEXT(source, next_parent) == NULL) 1435d06107adSMax Reitz { 1436d06107adSMax Reitz /* Assert that we are back in sync once all active write 1437d06107adSMax Reitz * operations are settled. 1438d06107adSMax Reitz * Note that we can only assert this if the mirror node 1439d06107adSMax Reitz * is the source node's only parent. */ 1440d06107adSMax Reitz assert(!bdrv_get_dirty_count(op->s->dirty_bitmap)); 1441d06107adSMax Reitz } 1442d06107adSMax Reitz } 1443d06107adSMax Reitz bitmap_clear(op->s->in_flight_bitmap, start_chunk, end_chunk - start_chunk); 1444d06107adSMax Reitz QTAILQ_REMOVE(&op->s->ops_in_flight, op, next); 1445d06107adSMax Reitz qemu_co_queue_restart_all(&op->waiting_requests); 1446d06107adSMax Reitz g_free(op); 1447d06107adSMax Reitz } 1448d06107adSMax Reitz 1449b9b10c35SKevin Wolf static int coroutine_fn GRAPH_RDLOCK 1450b9b10c35SKevin Wolf bdrv_mirror_top_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, 1451b9b10c35SKevin Wolf QEMUIOVector *qiov, BdrvRequestFlags flags) 14524ef85a9cSKevin Wolf { 14534ef85a9cSKevin Wolf return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags); 14544ef85a9cSKevin Wolf } 14554ef85a9cSKevin Wolf 14569a5a1c62SEmanuele Giuseppe Esposito static int coroutine_fn GRAPH_RDLOCK 14579a5a1c62SEmanuele Giuseppe Esposito bdrv_mirror_top_do_write(BlockDriverState *bs, MirrorMethod method, 14589a5a1c62SEmanuele Giuseppe Esposito uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, 1459d06107adSMax Reitz int flags) 1460d06107adSMax Reitz { 1461d06107adSMax Reitz MirrorOp *op = NULL; 1462d06107adSMax Reitz MirrorBDSOpaque *s = bs->opaque; 1463d06107adSMax Reitz int ret = 0; 1464da93d5c8SHanna Reitz bool copy_to_target = false; 1465d06107adSMax Reitz 1466da93d5c8SHanna Reitz if (s->job) { 1467d06107adSMax Reitz copy_to_target = s->job->ret >= 0 && 14689b230ef9SHanna Reitz !job_is_cancelled(&s->job->common.job) && 1469d06107adSMax Reitz s->job->copy_mode == MIRROR_COPY_MODE_WRITE_BLOCKING; 1470da93d5c8SHanna Reitz } 1471d06107adSMax Reitz 1472d06107adSMax Reitz if (copy_to_target) { 1473d06107adSMax Reitz op = active_write_prepare(s->job, offset, bytes); 1474d06107adSMax Reitz } 1475d06107adSMax Reitz 1476d06107adSMax Reitz switch (method) { 1477d06107adSMax Reitz case MIRROR_METHOD_COPY: 1478d06107adSMax Reitz ret = bdrv_co_pwritev(bs->backing, offset, bytes, qiov, flags); 1479d06107adSMax Reitz break; 1480d06107adSMax Reitz 1481d06107adSMax Reitz case MIRROR_METHOD_ZERO: 1482d06107adSMax Reitz ret = bdrv_co_pwrite_zeroes(bs->backing, offset, bytes, flags); 1483d06107adSMax Reitz break; 1484d06107adSMax Reitz 1485d06107adSMax Reitz case MIRROR_METHOD_DISCARD: 14860b9fd3f4SFam Zheng ret = bdrv_co_pdiscard(bs->backing, offset, bytes); 1487d06107adSMax Reitz break; 1488d06107adSMax Reitz 1489d06107adSMax Reitz default: 1490d06107adSMax Reitz abort(); 1491d06107adSMax Reitz } 1492d06107adSMax Reitz 1493d06107adSMax Reitz if (ret < 0) { 1494d06107adSMax Reitz goto out; 1495d06107adSMax Reitz } 1496d06107adSMax Reitz 1497d06107adSMax Reitz if (copy_to_target) { 1498d06107adSMax Reitz do_sync_target_write(s->job, method, offset, bytes, qiov, flags); 1499d06107adSMax Reitz } 1500d06107adSMax Reitz 1501d06107adSMax Reitz out: 1502d06107adSMax Reitz if (copy_to_target) { 1503d06107adSMax Reitz active_write_settle(op); 1504d06107adSMax Reitz } 1505d06107adSMax Reitz return ret; 1506d06107adSMax Reitz } 1507d06107adSMax Reitz 1508b9b10c35SKevin Wolf static int coroutine_fn GRAPH_RDLOCK 1509b9b10c35SKevin Wolf bdrv_mirror_top_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, 1510b9b10c35SKevin Wolf QEMUIOVector *qiov, BdrvRequestFlags flags) 15114ef85a9cSKevin Wolf { 1512d06107adSMax Reitz MirrorBDSOpaque *s = bs->opaque; 1513d06107adSMax Reitz QEMUIOVector bounce_qiov; 1514d06107adSMax Reitz void *bounce_buf; 1515d06107adSMax Reitz int ret = 0; 1516da93d5c8SHanna Reitz bool copy_to_target = false; 1517d06107adSMax Reitz 1518da93d5c8SHanna Reitz if (s->job) { 1519d06107adSMax Reitz copy_to_target = s->job->ret >= 0 && 15209b230ef9SHanna Reitz !job_is_cancelled(&s->job->common.job) && 1521d06107adSMax Reitz s->job->copy_mode == MIRROR_COPY_MODE_WRITE_BLOCKING; 1522da93d5c8SHanna Reitz } 1523d06107adSMax Reitz 1524d06107adSMax Reitz if (copy_to_target) { 1525d06107adSMax Reitz /* The guest might concurrently modify the data to write; but 1526d06107adSMax Reitz * the data on source and destination must match, so we have 1527d06107adSMax Reitz * to use a bounce buffer if we are going to write to the 1528d06107adSMax Reitz * target now. */ 1529d06107adSMax Reitz bounce_buf = qemu_blockalign(bs, bytes); 1530d06107adSMax Reitz iov_to_buf_full(qiov->iov, qiov->niov, 0, bounce_buf, bytes); 1531d06107adSMax Reitz 1532d06107adSMax Reitz qemu_iovec_init(&bounce_qiov, 1); 1533d06107adSMax Reitz qemu_iovec_add(&bounce_qiov, bounce_buf, bytes); 1534d06107adSMax Reitz qiov = &bounce_qiov; 1535e8b65355SStefan Hajnoczi 1536e8b65355SStefan Hajnoczi flags &= ~BDRV_REQ_REGISTERED_BUF; 1537d06107adSMax Reitz } 1538d06107adSMax Reitz 1539d06107adSMax Reitz ret = bdrv_mirror_top_do_write(bs, MIRROR_METHOD_COPY, offset, bytes, qiov, 1540d06107adSMax Reitz flags); 1541d06107adSMax Reitz 1542d06107adSMax Reitz if (copy_to_target) { 1543d06107adSMax Reitz qemu_iovec_destroy(&bounce_qiov); 1544d06107adSMax Reitz qemu_vfree(bounce_buf); 1545d06107adSMax Reitz } 1546d06107adSMax Reitz 1547d06107adSMax Reitz return ret; 15484ef85a9cSKevin Wolf } 15494ef85a9cSKevin Wolf 155088095349SEmanuele Giuseppe Esposito static int coroutine_fn GRAPH_RDLOCK bdrv_mirror_top_flush(BlockDriverState *bs) 15514ef85a9cSKevin Wolf { 1552ce960aa9SVladimir Sementsov-Ogievskiy if (bs->backing == NULL) { 1553ce960aa9SVladimir Sementsov-Ogievskiy /* we can be here after failed bdrv_append in mirror_start_job */ 1554ce960aa9SVladimir Sementsov-Ogievskiy return 0; 1555ce960aa9SVladimir Sementsov-Ogievskiy } 15564ef85a9cSKevin Wolf return bdrv_co_flush(bs->backing->bs); 15574ef85a9cSKevin Wolf } 15584ef85a9cSKevin Wolf 1559abaf8b75SKevin Wolf static int coroutine_fn GRAPH_RDLOCK 1560abaf8b75SKevin Wolf bdrv_mirror_top_pwrite_zeroes(BlockDriverState *bs, int64_t offset, 1561abaf8b75SKevin Wolf int64_t bytes, BdrvRequestFlags flags) 15624ef85a9cSKevin Wolf { 1563d06107adSMax Reitz return bdrv_mirror_top_do_write(bs, MIRROR_METHOD_ZERO, offset, bytes, NULL, 1564d06107adSMax Reitz flags); 15654ef85a9cSKevin Wolf } 15664ef85a9cSKevin Wolf 15679a5a1c62SEmanuele Giuseppe Esposito static int coroutine_fn GRAPH_RDLOCK 15689a5a1c62SEmanuele Giuseppe Esposito bdrv_mirror_top_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) 15694ef85a9cSKevin Wolf { 1570d06107adSMax Reitz return bdrv_mirror_top_do_write(bs, MIRROR_METHOD_DISCARD, offset, bytes, 1571d06107adSMax Reitz NULL, 0); 15724ef85a9cSKevin Wolf } 15734ef85a9cSKevin Wolf 1574998b3a1eSMax Reitz static void bdrv_mirror_top_refresh_filename(BlockDriverState *bs) 1575fd4a6493SKevin Wolf { 157618775ff3SVladimir Sementsov-Ogievskiy if (bs->backing == NULL) { 157718775ff3SVladimir Sementsov-Ogievskiy /* we can be here after failed bdrv_attach_child in 157818775ff3SVladimir Sementsov-Ogievskiy * bdrv_set_backing_hd */ 157918775ff3SVladimir Sementsov-Ogievskiy return; 158018775ff3SVladimir Sementsov-Ogievskiy } 1581fd4a6493SKevin Wolf pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), 1582fd4a6493SKevin Wolf bs->backing->bs->filename); 1583fd4a6493SKevin Wolf } 1584fd4a6493SKevin Wolf 15854ef85a9cSKevin Wolf static void bdrv_mirror_top_child_perm(BlockDriverState *bs, BdrvChild *c, 1586bf8e925eSMax Reitz BdrvChildRole role, 1587e0995dc3SKevin Wolf BlockReopenQueue *reopen_queue, 15884ef85a9cSKevin Wolf uint64_t perm, uint64_t shared, 15894ef85a9cSKevin Wolf uint64_t *nperm, uint64_t *nshared) 15904ef85a9cSKevin Wolf { 1591f94dc3b4SMax Reitz MirrorBDSOpaque *s = bs->opaque; 1592f94dc3b4SMax Reitz 1593f94dc3b4SMax Reitz if (s->stop) { 1594f94dc3b4SMax Reitz /* 1595f94dc3b4SMax Reitz * If the job is to be stopped, we do not need to forward 1596f94dc3b4SMax Reitz * anything to the real image. 1597f94dc3b4SMax Reitz */ 1598f94dc3b4SMax Reitz *nperm = 0; 1599f94dc3b4SMax Reitz *nshared = BLK_PERM_ALL; 1600f94dc3b4SMax Reitz return; 1601f94dc3b4SMax Reitz } 1602f94dc3b4SMax Reitz 160353431b90SMax Reitz bdrv_default_perms(bs, c, role, reopen_queue, 160453431b90SMax Reitz perm, shared, nperm, nshared); 16054ef85a9cSKevin Wolf 160653431b90SMax Reitz if (s->is_commit) { 160753431b90SMax Reitz /* 160853431b90SMax Reitz * For commit jobs, we cannot take CONSISTENT_READ, because 160953431b90SMax Reitz * that permission is unshared for everything above the base 161053431b90SMax Reitz * node (except for filters on the base node). 161153431b90SMax Reitz * We also have to force-share the WRITE permission, or 161253431b90SMax Reitz * otherwise we would block ourselves at the base node (if 161353431b90SMax Reitz * writes are blocked for a node, they are also blocked for 161453431b90SMax Reitz * its backing file). 161553431b90SMax Reitz * (We could also share RESIZE, because it may be needed for 161653431b90SMax Reitz * the target if its size is less than the top node's; but 161753431b90SMax Reitz * bdrv_default_perms_for_cow() automatically shares RESIZE 161853431b90SMax Reitz * for backing nodes if WRITE is shared, so there is no need 161953431b90SMax Reitz * to do it here.) 162053431b90SMax Reitz */ 162153431b90SMax Reitz *nperm &= ~BLK_PERM_CONSISTENT_READ; 162253431b90SMax Reitz *nshared |= BLK_PERM_WRITE; 162353431b90SMax Reitz } 16244ef85a9cSKevin Wolf } 16254ef85a9cSKevin Wolf 16264ef85a9cSKevin Wolf /* Dummy node that provides consistent read to its users without requiring it 16274ef85a9cSKevin Wolf * from its backing file and that allows writes on the backing file chain. */ 16284ef85a9cSKevin Wolf static BlockDriver bdrv_mirror_top = { 16294ef85a9cSKevin Wolf .format_name = "mirror_top", 16304ef85a9cSKevin Wolf .bdrv_co_preadv = bdrv_mirror_top_preadv, 16314ef85a9cSKevin Wolf .bdrv_co_pwritev = bdrv_mirror_top_pwritev, 16324ef85a9cSKevin Wolf .bdrv_co_pwrite_zeroes = bdrv_mirror_top_pwrite_zeroes, 16334ef85a9cSKevin Wolf .bdrv_co_pdiscard = bdrv_mirror_top_pdiscard, 16344ef85a9cSKevin Wolf .bdrv_co_flush = bdrv_mirror_top_flush, 1635fd4a6493SKevin Wolf .bdrv_refresh_filename = bdrv_mirror_top_refresh_filename, 16364ef85a9cSKevin Wolf .bdrv_child_perm = bdrv_mirror_top_child_perm, 16376540fd15SMax Reitz 16386540fd15SMax Reitz .is_filter = true, 1639046fd84fSVladimir Sementsov-Ogievskiy .filtered_child_is_backing = true, 16404ef85a9cSKevin Wolf }; 16414ef85a9cSKevin Wolf 1642cc19f177SVladimir Sementsov-Ogievskiy static BlockJob *mirror_start_job( 1643cc19f177SVladimir Sementsov-Ogievskiy const char *job_id, BlockDriverState *bs, 164447970dfbSJohn Snow int creation_flags, BlockDriverState *target, 164547970dfbSJohn Snow const char *replaces, int64_t speed, 164647970dfbSJohn Snow uint32_t granularity, int64_t buf_size, 1647274fcceeSMax Reitz BlockMirrorBackingMode backing_mode, 1648cdf3bc93SMax Reitz bool zero_target, 164903544a6eSFam Zheng BlockdevOnError on_source_error, 1650b952b558SPaolo Bonzini BlockdevOnError on_target_error, 16510fc9f8eaSFam Zheng bool unmap, 1652097310b5SMarkus Armbruster BlockCompletionFunc *cb, 165351ccfa2dSFam Zheng void *opaque, 165403544a6eSFam Zheng const BlockJobDriver *driver, 1655b49f7eadSWen Congyang bool is_none_mode, BlockDriverState *base, 165651ccfa2dSFam Zheng bool auto_complete, const char *filter_node_name, 1657481debaaSMax Reitz bool is_mirror, MirrorCopyMode copy_mode, 165851ccfa2dSFam Zheng Error **errp) 1659893f7ebaSPaolo Bonzini { 1660893f7ebaSPaolo Bonzini MirrorBlockJob *s; 1661429076e8SMax Reitz MirrorBDSOpaque *bs_opaque; 16624ef85a9cSKevin Wolf BlockDriverState *mirror_top_bs; 16634ef85a9cSKevin Wolf bool target_is_backing; 16643f072a7fSMax Reitz uint64_t target_perms, target_shared_perms; 1665d7086422SKevin Wolf int ret; 1666893f7ebaSPaolo Bonzini 1667eee13dfeSPaolo Bonzini if (granularity == 0) { 1668341ebc2fSJohn Snow granularity = bdrv_get_default_bitmap_granularity(target); 1669eee13dfeSPaolo Bonzini } 1670eee13dfeSPaolo Bonzini 167131826642SEric Blake assert(is_power_of_2(granularity)); 1672eee13dfeSPaolo Bonzini 167348ac0a4dSWen Congyang if (buf_size < 0) { 167448ac0a4dSWen Congyang error_setg(errp, "Invalid parameter 'buf-size'"); 1675cc19f177SVladimir Sementsov-Ogievskiy return NULL; 167648ac0a4dSWen Congyang } 167748ac0a4dSWen Congyang 167848ac0a4dSWen Congyang if (buf_size == 0) { 167948ac0a4dSWen Congyang buf_size = DEFAULT_MIRROR_BUF_SIZE; 168048ac0a4dSWen Congyang } 16815bc361b8SFam Zheng 16823f072a7fSMax Reitz if (bdrv_skip_filters(bs) == bdrv_skip_filters(target)) { 168386fae10cSKevin Wolf error_setg(errp, "Can't mirror node into itself"); 1684cc19f177SVladimir Sementsov-Ogievskiy return NULL; 168586fae10cSKevin Wolf } 168686fae10cSKevin Wolf 168753431b90SMax Reitz target_is_backing = bdrv_chain_contains(bs, target); 168853431b90SMax Reitz 16894ef85a9cSKevin Wolf /* In the case of active commit, add dummy driver to provide consistent 16904ef85a9cSKevin Wolf * reads on the top, while disabling it in the intermediate nodes, and make 16914ef85a9cSKevin Wolf * the backing chain writable. */ 16926cdbceb1SKevin Wolf mirror_top_bs = bdrv_new_open_driver(&bdrv_mirror_top, filter_node_name, 16936cdbceb1SKevin Wolf BDRV_O_RDWR, errp); 16944ef85a9cSKevin Wolf if (mirror_top_bs == NULL) { 1695cc19f177SVladimir Sementsov-Ogievskiy return NULL; 1696893f7ebaSPaolo Bonzini } 1697d3c8c674SKevin Wolf if (!filter_node_name) { 1698d3c8c674SKevin Wolf mirror_top_bs->implicit = true; 1699d3c8c674SKevin Wolf } 1700e5182c1cSMax Reitz 1701e5182c1cSMax Reitz /* So that we can always drop this node */ 1702e5182c1cSMax Reitz mirror_top_bs->never_freeze = true; 1703e5182c1cSMax Reitz 17044ef85a9cSKevin Wolf mirror_top_bs->total_sectors = bs->total_sectors; 1705228345bfSMax Reitz mirror_top_bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED; 170680f5c33fSKevin Wolf mirror_top_bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | 170780f5c33fSKevin Wolf BDRV_REQ_NO_FALLBACK; 1708429076e8SMax Reitz bs_opaque = g_new0(MirrorBDSOpaque, 1); 1709429076e8SMax Reitz mirror_top_bs->opaque = bs_opaque; 1710893f7ebaSPaolo Bonzini 171153431b90SMax Reitz bs_opaque->is_commit = target_is_backing; 171253431b90SMax Reitz 17134ef85a9cSKevin Wolf bdrv_drained_begin(bs); 1714934aee14SVladimir Sementsov-Ogievskiy ret = bdrv_append(mirror_top_bs, bs, errp); 17154ef85a9cSKevin Wolf bdrv_drained_end(bs); 17164ef85a9cSKevin Wolf 1717934aee14SVladimir Sementsov-Ogievskiy if (ret < 0) { 1718b2c2832cSKevin Wolf bdrv_unref(mirror_top_bs); 1719cc19f177SVladimir Sementsov-Ogievskiy return NULL; 1720b2c2832cSKevin Wolf } 1721b2c2832cSKevin Wolf 17224ef85a9cSKevin Wolf /* Make sure that the source is not resized while the job is running */ 172375859b94SJohn Snow s = block_job_create(job_id, driver, NULL, mirror_top_bs, 17244ef85a9cSKevin Wolf BLK_PERM_CONSISTENT_READ, 17254ef85a9cSKevin Wolf BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED | 172664631f36SVladimir Sementsov-Ogievskiy BLK_PERM_WRITE, speed, 17274ef85a9cSKevin Wolf creation_flags, cb, opaque, errp); 17284ef85a9cSKevin Wolf if (!s) { 17294ef85a9cSKevin Wolf goto fail; 17304ef85a9cSKevin Wolf } 1731429076e8SMax Reitz 17327a25fcd0SMax Reitz /* The block job now has a reference to this node */ 17337a25fcd0SMax Reitz bdrv_unref(mirror_top_bs); 17347a25fcd0SMax Reitz 17354ef85a9cSKevin Wolf s->mirror_top_bs = mirror_top_bs; 17364ef85a9cSKevin Wolf 17374ef85a9cSKevin Wolf /* No resize for the target either; while the mirror is still running, a 17384ef85a9cSKevin Wolf * consistent read isn't necessarily possible. We could possibly allow 17394ef85a9cSKevin Wolf * writes and graph modifications, though it would likely defeat the 17404ef85a9cSKevin Wolf * purpose of a mirror, so leave them blocked for now. 17414ef85a9cSKevin Wolf * 17424ef85a9cSKevin Wolf * In the case of active commit, things look a bit different, though, 17434ef85a9cSKevin Wolf * because the target is an already populated backing file in active use. 17444ef85a9cSKevin Wolf * We can allow anything except resize there.*/ 17453f072a7fSMax Reitz 17463f072a7fSMax Reitz target_perms = BLK_PERM_WRITE; 17473f072a7fSMax Reitz target_shared_perms = BLK_PERM_WRITE_UNCHANGED; 17483f072a7fSMax Reitz 17493f072a7fSMax Reitz if (target_is_backing) { 17503f072a7fSMax Reitz int64_t bs_size, target_size; 17513f072a7fSMax Reitz bs_size = bdrv_getlength(bs); 17523f072a7fSMax Reitz if (bs_size < 0) { 17533f072a7fSMax Reitz error_setg_errno(errp, -bs_size, 17543f072a7fSMax Reitz "Could not inquire top image size"); 17553f072a7fSMax Reitz goto fail; 17563f072a7fSMax Reitz } 17573f072a7fSMax Reitz 17583f072a7fSMax Reitz target_size = bdrv_getlength(target); 17593f072a7fSMax Reitz if (target_size < 0) { 17603f072a7fSMax Reitz error_setg_errno(errp, -target_size, 17613f072a7fSMax Reitz "Could not inquire base image size"); 17623f072a7fSMax Reitz goto fail; 17633f072a7fSMax Reitz } 17643f072a7fSMax Reitz 17653f072a7fSMax Reitz if (target_size < bs_size) { 17663f072a7fSMax Reitz target_perms |= BLK_PERM_RESIZE; 17673f072a7fSMax Reitz } 17683f072a7fSMax Reitz 176964631f36SVladimir Sementsov-Ogievskiy target_shared_perms |= BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE; 17703f072a7fSMax Reitz } else if (bdrv_chain_contains(bs, bdrv_skip_filters(target))) { 17713f072a7fSMax Reitz /* 17723f072a7fSMax Reitz * We may want to allow this in the future, but it would 17733f072a7fSMax Reitz * require taking some extra care. 17743f072a7fSMax Reitz */ 17753f072a7fSMax Reitz error_setg(errp, "Cannot mirror to a filter on top of a node in the " 17763f072a7fSMax Reitz "source's backing chain"); 17773f072a7fSMax Reitz goto fail; 17783f072a7fSMax Reitz } 17793f072a7fSMax Reitz 1780d861ab3aSKevin Wolf s->target = blk_new(s->common.job.aio_context, 17813f072a7fSMax Reitz target_perms, target_shared_perms); 1782d7086422SKevin Wolf ret = blk_insert_bs(s->target, target, errp); 1783d7086422SKevin Wolf if (ret < 0) { 17844ef85a9cSKevin Wolf goto fail; 1785d7086422SKevin Wolf } 1786045a2f82SFam Zheng if (is_mirror) { 1787045a2f82SFam Zheng /* XXX: Mirror target could be a NBD server of target QEMU in the case 1788045a2f82SFam Zheng * of non-shared block migration. To allow migration completion, we 1789045a2f82SFam Zheng * have to allow "inactivate" of the target BB. When that happens, we 1790045a2f82SFam Zheng * know the job is drained, and the vcpus are stopped, so no write 1791045a2f82SFam Zheng * operation will be performed. Block layer already has assertions to 1792045a2f82SFam Zheng * ensure that. */ 1793045a2f82SFam Zheng blk_set_force_allow_inactivate(s->target); 1794045a2f82SFam Zheng } 17959ff7f0dfSKevin Wolf blk_set_allow_aio_context_change(s->target, true); 1796cf312932SKevin Wolf blk_set_disable_request_queuing(s->target, true); 1797e253f4b8SKevin Wolf 179809158f00SBenoît Canet s->replaces = g_strdup(replaces); 1799b952b558SPaolo Bonzini s->on_source_error = on_source_error; 1800b952b558SPaolo Bonzini s->on_target_error = on_target_error; 180103544a6eSFam Zheng s->is_none_mode = is_none_mode; 1802274fcceeSMax Reitz s->backing_mode = backing_mode; 1803cdf3bc93SMax Reitz s->zero_target = zero_target; 1804481debaaSMax Reitz s->copy_mode = copy_mode; 18055bc361b8SFam Zheng s->base = base; 18063f072a7fSMax Reitz s->base_overlay = bdrv_find_overlay(bs, base); 1807eee13dfeSPaolo Bonzini s->granularity = granularity; 180848ac0a4dSWen Congyang s->buf_size = ROUND_UP(buf_size, granularity); 18090fc9f8eaSFam Zheng s->unmap = unmap; 1810b49f7eadSWen Congyang if (auto_complete) { 1811b49f7eadSWen Congyang s->should_complete = true; 1812b49f7eadSWen Congyang } 1813b812f671SPaolo Bonzini 18140db6e54aSFam Zheng s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); 1815b8afb520SFam Zheng if (!s->dirty_bitmap) { 181688f9d1b3SKevin Wolf goto fail; 1817b8afb520SFam Zheng } 1818dbdf699cSVladimir Sementsov-Ogievskiy if (s->copy_mode == MIRROR_COPY_MODE_WRITE_BLOCKING) { 1819dbdf699cSVladimir Sementsov-Ogievskiy bdrv_disable_dirty_bitmap(s->dirty_bitmap); 1820dbdf699cSVladimir Sementsov-Ogievskiy } 182110f3cd15SAlberto Garcia 182267b24427SAlberto Garcia ret = block_job_add_bdrv(&s->common, "source", bs, 0, 182367b24427SAlberto Garcia BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE | 182467b24427SAlberto Garcia BLK_PERM_CONSISTENT_READ, 182567b24427SAlberto Garcia errp); 182667b24427SAlberto Garcia if (ret < 0) { 182767b24427SAlberto Garcia goto fail; 182867b24427SAlberto Garcia } 182967b24427SAlberto Garcia 18304ef85a9cSKevin Wolf /* Required permissions are already taken with blk_new() */ 183176d554e2SKevin Wolf block_job_add_bdrv(&s->common, "target", target, 0, BLK_PERM_ALL, 183276d554e2SKevin Wolf &error_abort); 183376d554e2SKevin Wolf 1834f3ede4b0SAlberto Garcia /* In commit_active_start() all intermediate nodes disappear, so 1835f3ede4b0SAlberto Garcia * any jobs in them must be blocked */ 18364ef85a9cSKevin Wolf if (target_is_backing) { 18373f072a7fSMax Reitz BlockDriverState *iter, *filtered_target; 18383f072a7fSMax Reitz uint64_t iter_shared_perms; 18393f072a7fSMax Reitz 18403f072a7fSMax Reitz /* 18413f072a7fSMax Reitz * The topmost node with 18423f072a7fSMax Reitz * bdrv_skip_filters(filtered_target) == bdrv_skip_filters(target) 18433f072a7fSMax Reitz */ 18443f072a7fSMax Reitz filtered_target = bdrv_cow_bs(bdrv_find_overlay(bs, target)); 18453f072a7fSMax Reitz 18463f072a7fSMax Reitz assert(bdrv_skip_filters(filtered_target) == 18473f072a7fSMax Reitz bdrv_skip_filters(target)); 18483f072a7fSMax Reitz 18493f072a7fSMax Reitz /* 18503f072a7fSMax Reitz * XXX BLK_PERM_WRITE needs to be allowed so we don't block 18514ef85a9cSKevin Wolf * ourselves at s->base (if writes are blocked for a node, they are 18524ef85a9cSKevin Wolf * also blocked for its backing file). The other options would be a 18533f072a7fSMax Reitz * second filter driver above s->base (== target). 18543f072a7fSMax Reitz */ 18553f072a7fSMax Reitz iter_shared_perms = BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE; 18563f072a7fSMax Reitz 18573f072a7fSMax Reitz for (iter = bdrv_filter_or_cow_bs(bs); iter != target; 18583f072a7fSMax Reitz iter = bdrv_filter_or_cow_bs(iter)) 18593f072a7fSMax Reitz { 18603f072a7fSMax Reitz if (iter == filtered_target) { 18613f072a7fSMax Reitz /* 18623f072a7fSMax Reitz * From here on, all nodes are filters on the base. 18633f072a7fSMax Reitz * This allows us to share BLK_PERM_CONSISTENT_READ. 18643f072a7fSMax Reitz */ 18653f072a7fSMax Reitz iter_shared_perms |= BLK_PERM_CONSISTENT_READ; 18663f072a7fSMax Reitz } 18673f072a7fSMax Reitz 18684ef85a9cSKevin Wolf ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0, 18693f072a7fSMax Reitz iter_shared_perms, errp); 18704ef85a9cSKevin Wolf if (ret < 0) { 18714ef85a9cSKevin Wolf goto fail; 18724ef85a9cSKevin Wolf } 1873f3ede4b0SAlberto Garcia } 1874ef53dc09SAlberto Garcia 1875ef53dc09SAlberto Garcia if (bdrv_freeze_backing_chain(mirror_top_bs, target, errp) < 0) { 1876ef53dc09SAlberto Garcia goto fail; 1877ef53dc09SAlberto Garcia } 1878f3ede4b0SAlberto Garcia } 187910f3cd15SAlberto Garcia 188012aa4082SMax Reitz QTAILQ_INIT(&s->ops_in_flight); 188112aa4082SMax Reitz 18825ccac6f1SJohn Snow trace_mirror_start(bs, s, opaque); 1883da01ff7fSKevin Wolf job_start(&s->common.job); 1884cc19f177SVladimir Sementsov-Ogievskiy 1885cc19f177SVladimir Sementsov-Ogievskiy return &s->common; 18864ef85a9cSKevin Wolf 18874ef85a9cSKevin Wolf fail: 18884ef85a9cSKevin Wolf if (s) { 18897a25fcd0SMax Reitz /* Make sure this BDS does not go away until we have completed the graph 18907a25fcd0SMax Reitz * changes below */ 18917a25fcd0SMax Reitz bdrv_ref(mirror_top_bs); 18927a25fcd0SMax Reitz 18934ef85a9cSKevin Wolf g_free(s->replaces); 18944ef85a9cSKevin Wolf blk_unref(s->target); 1895429076e8SMax Reitz bs_opaque->job = NULL; 1896e917e2cbSAlberto Garcia if (s->dirty_bitmap) { 18975deb6cbdSVladimir Sementsov-Ogievskiy bdrv_release_dirty_bitmap(s->dirty_bitmap); 1898e917e2cbSAlberto Garcia } 18994ad35181SKevin Wolf job_early_fail(&s->common.job); 19004ef85a9cSKevin Wolf } 19014ef85a9cSKevin Wolf 1902f94dc3b4SMax Reitz bs_opaque->stop = true; 1903f94dc3b4SMax Reitz bdrv_child_refresh_perms(mirror_top_bs, mirror_top_bs->backing, 1904c1cef672SFam Zheng &error_abort); 19053f072a7fSMax Reitz bdrv_replace_node(mirror_top_bs, mirror_top_bs->backing->bs, &error_abort); 19067a25fcd0SMax Reitz 19077a25fcd0SMax Reitz bdrv_unref(mirror_top_bs); 1908cc19f177SVladimir Sementsov-Ogievskiy 1909cc19f177SVladimir Sementsov-Ogievskiy return NULL; 1910893f7ebaSPaolo Bonzini } 191103544a6eSFam Zheng 191271aa9867SAlberto Garcia void mirror_start(const char *job_id, BlockDriverState *bs, 191371aa9867SAlberto Garcia BlockDriverState *target, const char *replaces, 1914a1999b33SJohn Snow int creation_flags, int64_t speed, 1915a1999b33SJohn Snow uint32_t granularity, int64_t buf_size, 1916274fcceeSMax Reitz MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, 1917cdf3bc93SMax Reitz bool zero_target, 1918274fcceeSMax Reitz BlockdevOnError on_source_error, 191903544a6eSFam Zheng BlockdevOnError on_target_error, 1920481debaaSMax Reitz bool unmap, const char *filter_node_name, 1921481debaaSMax Reitz MirrorCopyMode copy_mode, Error **errp) 192203544a6eSFam Zheng { 192303544a6eSFam Zheng bool is_none_mode; 192403544a6eSFam Zheng BlockDriverState *base; 192503544a6eSFam Zheng 1926b4ad82aaSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 1927b4ad82aaSEmanuele Giuseppe Esposito 1928c8b56501SJohn Snow if ((mode == MIRROR_SYNC_MODE_INCREMENTAL) || 1929c8b56501SJohn Snow (mode == MIRROR_SYNC_MODE_BITMAP)) { 1930c8b56501SJohn Snow error_setg(errp, "Sync mode '%s' not supported", 1931c8b56501SJohn Snow MirrorSyncMode_str(mode)); 1932d58d8453SJohn Snow return; 1933d58d8453SJohn Snow } 193403544a6eSFam Zheng is_none_mode = mode == MIRROR_SYNC_MODE_NONE; 19353f072a7fSMax Reitz base = mode == MIRROR_SYNC_MODE_TOP ? bdrv_backing_chain_next(bs) : NULL; 1936a1999b33SJohn Snow mirror_start_job(job_id, bs, creation_flags, target, replaces, 1937cdf3bc93SMax Reitz speed, granularity, buf_size, backing_mode, zero_target, 193851ccfa2dSFam Zheng on_source_error, on_target_error, unmap, NULL, NULL, 19396cdbceb1SKevin Wolf &mirror_job_driver, is_none_mode, base, false, 1940481debaaSMax Reitz filter_node_name, true, copy_mode, errp); 194103544a6eSFam Zheng } 194203544a6eSFam Zheng 1943cc19f177SVladimir Sementsov-Ogievskiy BlockJob *commit_active_start(const char *job_id, BlockDriverState *bs, 194447970dfbSJohn Snow BlockDriverState *base, int creation_flags, 194547970dfbSJohn Snow int64_t speed, BlockdevOnError on_error, 19460db832f4SKevin Wolf const char *filter_node_name, 194778bbd910SFam Zheng BlockCompletionFunc *cb, void *opaque, 194878bbd910SFam Zheng bool auto_complete, Error **errp) 194903544a6eSFam Zheng { 19501ba79388SAlberto Garcia bool base_read_only; 1951eb5becc1SVladimir Sementsov-Ogievskiy BlockJob *job; 19524da83585SJeff Cody 1953b4ad82aaSEmanuele Giuseppe Esposito GLOBAL_STATE_CODE(); 1954b4ad82aaSEmanuele Giuseppe Esposito 19551ba79388SAlberto Garcia base_read_only = bdrv_is_read_only(base); 19564da83585SJeff Cody 19571ba79388SAlberto Garcia if (base_read_only) { 19581ba79388SAlberto Garcia if (bdrv_reopen_set_read_only(base, false, errp) < 0) { 1959cc19f177SVladimir Sementsov-Ogievskiy return NULL; 196020a63d2cSFam Zheng } 19611ba79388SAlberto Garcia } 19624da83585SJeff Cody 1963eb5becc1SVladimir Sementsov-Ogievskiy job = mirror_start_job( 1964cc19f177SVladimir Sementsov-Ogievskiy job_id, bs, creation_flags, base, NULL, speed, 0, 0, 1965cdf3bc93SMax Reitz MIRROR_LEAVE_BACKING_CHAIN, false, 196651ccfa2dSFam Zheng on_error, on_error, true, cb, opaque, 19676cdbceb1SKevin Wolf &commit_active_job_driver, false, base, auto_complete, 1968481debaaSMax Reitz filter_node_name, false, MIRROR_COPY_MODE_BACKGROUND, 1969eb5becc1SVladimir Sementsov-Ogievskiy errp); 1970eb5becc1SVladimir Sementsov-Ogievskiy if (!job) { 19714da83585SJeff Cody goto error_restore_flags; 19724da83585SJeff Cody } 19734da83585SJeff Cody 1974eb5becc1SVladimir Sementsov-Ogievskiy return job; 19754da83585SJeff Cody 19764da83585SJeff Cody error_restore_flags: 19774da83585SJeff Cody /* ignore error and errp for bdrv_reopen, because we want to propagate 19784da83585SJeff Cody * the original error */ 19791ba79388SAlberto Garcia if (base_read_only) { 19801ba79388SAlberto Garcia bdrv_reopen_set_read_only(base, true, NULL); 19811ba79388SAlberto Garcia } 1982cc19f177SVladimir Sementsov-Ogievskiy return NULL; 198303544a6eSFam Zheng } 1984