xref: /qemu/block/mirror.c (revision becc347e1ca6884b4bc74a0572d3206bee7fec13)
1893f7ebaSPaolo Bonzini /*
2893f7ebaSPaolo Bonzini  * Image mirroring
3893f7ebaSPaolo Bonzini  *
4893f7ebaSPaolo Bonzini  * Copyright Red Hat, Inc. 2012
5893f7ebaSPaolo Bonzini  *
6893f7ebaSPaolo Bonzini  * Authors:
7893f7ebaSPaolo Bonzini  *  Paolo Bonzini  <pbonzini@redhat.com>
8893f7ebaSPaolo Bonzini  *
9893f7ebaSPaolo Bonzini  * This work is licensed under the terms of the GNU LGPL, version 2 or later.
10893f7ebaSPaolo Bonzini  * See the COPYING.LIB file in the top-level directory.
11893f7ebaSPaolo Bonzini  *
12893f7ebaSPaolo Bonzini  */
13893f7ebaSPaolo Bonzini 
1480c71a24SPeter Maydell #include "qemu/osdep.h"
15893f7ebaSPaolo Bonzini #include "trace.h"
16c87621eaSJohn Snow #include "block/blockjob_int.h"
17737e150eSPaolo Bonzini #include "block/block_int.h"
18373340b2SMax Reitz #include "sysemu/block-backend.h"
19da34e65cSMarkus Armbruster #include "qapi/error.h"
20cc7a8ea7SMarkus Armbruster #include "qapi/qmp/qerror.h"
21893f7ebaSPaolo Bonzini #include "qemu/ratelimit.h"
22b812f671SPaolo Bonzini #include "qemu/bitmap.h"
23893f7ebaSPaolo Bonzini 
24893f7ebaSPaolo Bonzini #define SLICE_TIME    100000000ULL /* ns */
25402a4741SPaolo Bonzini #define MAX_IN_FLIGHT 16
260965a41eSVladimir Sementsov-Ogievskiy #define MAX_IO_SECTORS ((1 << 20) >> BDRV_SECTOR_BITS) /* 1 Mb */
270965a41eSVladimir Sementsov-Ogievskiy #define DEFAULT_MIRROR_BUF_SIZE \
280965a41eSVladimir Sementsov-Ogievskiy     (MAX_IN_FLIGHT * MAX_IO_SECTORS * BDRV_SECTOR_SIZE)
29402a4741SPaolo Bonzini 
30402a4741SPaolo Bonzini /* The mirroring buffer is a list of granularity-sized chunks.
31402a4741SPaolo Bonzini  * Free chunks are organized in a list.
32402a4741SPaolo Bonzini  */
33402a4741SPaolo Bonzini typedef struct MirrorBuffer {
34402a4741SPaolo Bonzini     QSIMPLEQ_ENTRY(MirrorBuffer) next;
35402a4741SPaolo Bonzini } MirrorBuffer;
36893f7ebaSPaolo Bonzini 
37893f7ebaSPaolo Bonzini typedef struct MirrorBlockJob {
38893f7ebaSPaolo Bonzini     BlockJob common;
39893f7ebaSPaolo Bonzini     RateLimit limit;
40e253f4b8SKevin Wolf     BlockBackend *target;
415bc361b8SFam Zheng     BlockDriverState *base;
4209158f00SBenoît Canet     /* The name of the graph node to replace */
4309158f00SBenoît Canet     char *replaces;
4409158f00SBenoît Canet     /* The BDS to replace */
4509158f00SBenoît Canet     BlockDriverState *to_replace;
4609158f00SBenoît Canet     /* Used to block operations on the drive-mirror-replace target */
4709158f00SBenoît Canet     Error *replace_blocker;
4803544a6eSFam Zheng     bool is_none_mode;
49274fcceeSMax Reitz     BlockMirrorBackingMode backing_mode;
50b952b558SPaolo Bonzini     BlockdevOnError on_source_error, on_target_error;
51d63ffd87SPaolo Bonzini     bool synced;
52d63ffd87SPaolo Bonzini     bool should_complete;
53eee13dfeSPaolo Bonzini     int64_t granularity;
54b812f671SPaolo Bonzini     size_t buf_size;
55b21c7652SMax Reitz     int64_t bdev_length;
56b812f671SPaolo Bonzini     unsigned long *cow_bitmap;
57e4654d2dSFam Zheng     BdrvDirtyBitmap *dirty_bitmap;
58dc162c8eSFam Zheng     BdrvDirtyBitmapIter *dbi;
59893f7ebaSPaolo Bonzini     uint8_t *buf;
60402a4741SPaolo Bonzini     QSIMPLEQ_HEAD(, MirrorBuffer) buf_free;
61402a4741SPaolo Bonzini     int buf_free_count;
62bd48bde8SPaolo Bonzini 
6349efb1f5SDenis V. Lunev     uint64_t last_pause_ns;
64402a4741SPaolo Bonzini     unsigned long *in_flight_bitmap;
65bd48bde8SPaolo Bonzini     int in_flight;
66531509baSDenis V. Lunev     int64_t sectors_in_flight;
67bd48bde8SPaolo Bonzini     int ret;
680fc9f8eaSFam Zheng     bool unmap;
69e424aff5SKevin Wolf     bool waiting_for_io;
70e5b43573SFam Zheng     int target_cluster_sectors;
71e5b43573SFam Zheng     int max_iov;
7290ab48ebSAnton Nefedov     bool initial_zeroing_ongoing;
73893f7ebaSPaolo Bonzini } MirrorBlockJob;
74893f7ebaSPaolo Bonzini 
75bd48bde8SPaolo Bonzini typedef struct MirrorOp {
76bd48bde8SPaolo Bonzini     MirrorBlockJob *s;
77bd48bde8SPaolo Bonzini     QEMUIOVector qiov;
78bd48bde8SPaolo Bonzini     int64_t sector_num;
79bd48bde8SPaolo Bonzini     int nb_sectors;
80bd48bde8SPaolo Bonzini } MirrorOp;
81bd48bde8SPaolo Bonzini 
82b952b558SPaolo Bonzini static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read,
83b952b558SPaolo Bonzini                                             int error)
84b952b558SPaolo Bonzini {
85b952b558SPaolo Bonzini     s->synced = false;
86b952b558SPaolo Bonzini     if (read) {
8781e254dcSKevin Wolf         return block_job_error_action(&s->common, s->on_source_error,
8881e254dcSKevin Wolf                                       true, error);
89b952b558SPaolo Bonzini     } else {
9081e254dcSKevin Wolf         return block_job_error_action(&s->common, s->on_target_error,
9181e254dcSKevin Wolf                                       false, error);
92b952b558SPaolo Bonzini     }
93b952b558SPaolo Bonzini }
94b952b558SPaolo Bonzini 
95bd48bde8SPaolo Bonzini static void mirror_iteration_done(MirrorOp *op, int ret)
96bd48bde8SPaolo Bonzini {
97bd48bde8SPaolo Bonzini     MirrorBlockJob *s = op->s;
98402a4741SPaolo Bonzini     struct iovec *iov;
99bd48bde8SPaolo Bonzini     int64_t chunk_num;
100402a4741SPaolo Bonzini     int i, nb_chunks, sectors_per_chunk;
101bd48bde8SPaolo Bonzini 
102bd48bde8SPaolo Bonzini     trace_mirror_iteration_done(s, op->sector_num, op->nb_sectors, ret);
103bd48bde8SPaolo Bonzini 
104bd48bde8SPaolo Bonzini     s->in_flight--;
105b21c7652SMax Reitz     s->sectors_in_flight -= op->nb_sectors;
106402a4741SPaolo Bonzini     iov = op->qiov.iov;
107402a4741SPaolo Bonzini     for (i = 0; i < op->qiov.niov; i++) {
108402a4741SPaolo Bonzini         MirrorBuffer *buf = (MirrorBuffer *) iov[i].iov_base;
109402a4741SPaolo Bonzini         QSIMPLEQ_INSERT_TAIL(&s->buf_free, buf, next);
110402a4741SPaolo Bonzini         s->buf_free_count++;
111402a4741SPaolo Bonzini     }
112402a4741SPaolo Bonzini 
113bd48bde8SPaolo Bonzini     sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS;
114bd48bde8SPaolo Bonzini     chunk_num = op->sector_num / sectors_per_chunk;
1154150ae60SFam Zheng     nb_chunks = DIV_ROUND_UP(op->nb_sectors, sectors_per_chunk);
116402a4741SPaolo Bonzini     bitmap_clear(s->in_flight_bitmap, chunk_num, nb_chunks);
117b21c7652SMax Reitz     if (ret >= 0) {
118b21c7652SMax Reitz         if (s->cow_bitmap) {
119bd48bde8SPaolo Bonzini             bitmap_set(s->cow_bitmap, chunk_num, nb_chunks);
120bd48bde8SPaolo Bonzini         }
12190ab48ebSAnton Nefedov         if (!s->initial_zeroing_ongoing) {
122b21c7652SMax Reitz             s->common.offset += (uint64_t)op->nb_sectors * BDRV_SECTOR_SIZE;
123b21c7652SMax Reitz         }
12490ab48ebSAnton Nefedov     }
1256df3bf8eSZhang Min     qemu_iovec_destroy(&op->qiov);
126c84b3192SPaolo Bonzini     g_free(op);
1277b770c72SStefan Hajnoczi 
128e424aff5SKevin Wolf     if (s->waiting_for_io) {
1290b8b8753SPaolo Bonzini         qemu_coroutine_enter(s->common.co);
130bd48bde8SPaolo Bonzini     }
1317b770c72SStefan Hajnoczi }
132bd48bde8SPaolo Bonzini 
133bd48bde8SPaolo Bonzini static void mirror_write_complete(void *opaque, int ret)
134bd48bde8SPaolo Bonzini {
135bd48bde8SPaolo Bonzini     MirrorOp *op = opaque;
136bd48bde8SPaolo Bonzini     MirrorBlockJob *s = op->s;
137b9e413ddSPaolo Bonzini 
138b9e413ddSPaolo Bonzini     aio_context_acquire(blk_get_aio_context(s->common.blk));
139bd48bde8SPaolo Bonzini     if (ret < 0) {
140bd48bde8SPaolo Bonzini         BlockErrorAction action;
141bd48bde8SPaolo Bonzini 
14220dca810SJohn Snow         bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors);
143bd48bde8SPaolo Bonzini         action = mirror_error_action(s, false, -ret);
144a589569fSWenchao Xia         if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) {
145bd48bde8SPaolo Bonzini             s->ret = ret;
146bd48bde8SPaolo Bonzini         }
147bd48bde8SPaolo Bonzini     }
148bd48bde8SPaolo Bonzini     mirror_iteration_done(op, ret);
149b9e413ddSPaolo Bonzini     aio_context_release(blk_get_aio_context(s->common.blk));
150bd48bde8SPaolo Bonzini }
151bd48bde8SPaolo Bonzini 
152bd48bde8SPaolo Bonzini static void mirror_read_complete(void *opaque, int ret)
153bd48bde8SPaolo Bonzini {
154bd48bde8SPaolo Bonzini     MirrorOp *op = opaque;
155bd48bde8SPaolo Bonzini     MirrorBlockJob *s = op->s;
156b9e413ddSPaolo Bonzini 
157b9e413ddSPaolo Bonzini     aio_context_acquire(blk_get_aio_context(s->common.blk));
158bd48bde8SPaolo Bonzini     if (ret < 0) {
159bd48bde8SPaolo Bonzini         BlockErrorAction action;
160bd48bde8SPaolo Bonzini 
16120dca810SJohn Snow         bdrv_set_dirty_bitmap(s->dirty_bitmap, op->sector_num, op->nb_sectors);
162bd48bde8SPaolo Bonzini         action = mirror_error_action(s, true, -ret);
163a589569fSWenchao Xia         if (action == BLOCK_ERROR_ACTION_REPORT && s->ret >= 0) {
164bd48bde8SPaolo Bonzini             s->ret = ret;
165bd48bde8SPaolo Bonzini         }
166bd48bde8SPaolo Bonzini 
167bd48bde8SPaolo Bonzini         mirror_iteration_done(op, ret);
168b9e413ddSPaolo Bonzini     } else {
169e253f4b8SKevin Wolf         blk_aio_pwritev(s->target, op->sector_num * BDRV_SECTOR_SIZE, &op->qiov,
17073698c30SEric Blake                         0, mirror_write_complete, op);
171bd48bde8SPaolo Bonzini     }
172b9e413ddSPaolo Bonzini     aio_context_release(blk_get_aio_context(s->common.blk));
173b9e413ddSPaolo Bonzini }
174bd48bde8SPaolo Bonzini 
1754150ae60SFam Zheng static inline void mirror_clip_sectors(MirrorBlockJob *s,
1764150ae60SFam Zheng                                        int64_t sector_num,
1774150ae60SFam Zheng                                        int *nb_sectors)
1784150ae60SFam Zheng {
1794150ae60SFam Zheng     *nb_sectors = MIN(*nb_sectors,
1804150ae60SFam Zheng                       s->bdev_length / BDRV_SECTOR_SIZE - sector_num);
1814150ae60SFam Zheng }
1824150ae60SFam Zheng 
183e5b43573SFam Zheng /* Round sector_num and/or nb_sectors to target cluster if COW is needed, and
184e5b43573SFam Zheng  * return the offset of the adjusted tail sector against original. */
185e5b43573SFam Zheng static int mirror_cow_align(MirrorBlockJob *s,
186e5b43573SFam Zheng                             int64_t *sector_num,
187e5b43573SFam Zheng                             int *nb_sectors)
188893f7ebaSPaolo Bonzini {
189e5b43573SFam Zheng     bool need_cow;
190e5b43573SFam Zheng     int ret = 0;
191e5b43573SFam Zheng     int chunk_sectors = s->granularity >> BDRV_SECTOR_BITS;
192e5b43573SFam Zheng     int64_t align_sector_num = *sector_num;
193e5b43573SFam Zheng     int align_nb_sectors = *nb_sectors;
194e5b43573SFam Zheng     int max_sectors = chunk_sectors * s->max_iov;
195893f7ebaSPaolo Bonzini 
196e5b43573SFam Zheng     need_cow = !test_bit(*sector_num / chunk_sectors, s->cow_bitmap);
197e5b43573SFam Zheng     need_cow |= !test_bit((*sector_num + *nb_sectors - 1) / chunk_sectors,
198e5b43573SFam Zheng                           s->cow_bitmap);
199e5b43573SFam Zheng     if (need_cow) {
200244483e6SKevin Wolf         bdrv_round_sectors_to_clusters(blk_bs(s->target), *sector_num,
201244483e6SKevin Wolf                                        *nb_sectors, &align_sector_num,
202244483e6SKevin Wolf                                        &align_nb_sectors);
2038f0720ecSPaolo Bonzini     }
2048f0720ecSPaolo Bonzini 
205e5b43573SFam Zheng     if (align_nb_sectors > max_sectors) {
206e5b43573SFam Zheng         align_nb_sectors = max_sectors;
207e5b43573SFam Zheng         if (need_cow) {
208e5b43573SFam Zheng             align_nb_sectors = QEMU_ALIGN_DOWN(align_nb_sectors,
209e5b43573SFam Zheng                                                s->target_cluster_sectors);
210e5b43573SFam Zheng         }
211e5b43573SFam Zheng     }
2124150ae60SFam Zheng     /* Clipping may result in align_nb_sectors unaligned to chunk boundary, but
2134150ae60SFam Zheng      * that doesn't matter because it's already the end of source image. */
2144150ae60SFam Zheng     mirror_clip_sectors(s, align_sector_num, &align_nb_sectors);
215402a4741SPaolo Bonzini 
216e5b43573SFam Zheng     ret = align_sector_num + align_nb_sectors - (*sector_num + *nb_sectors);
217e5b43573SFam Zheng     *sector_num = align_sector_num;
218e5b43573SFam Zheng     *nb_sectors = align_nb_sectors;
219e5b43573SFam Zheng     assert(ret >= 0);
220e5b43573SFam Zheng     return ret;
221e5b43573SFam Zheng }
222e5b43573SFam Zheng 
22321cd917fSFam Zheng static inline void mirror_wait_for_io(MirrorBlockJob *s)
22421cd917fSFam Zheng {
22521cd917fSFam Zheng     assert(!s->waiting_for_io);
22621cd917fSFam Zheng     s->waiting_for_io = true;
22721cd917fSFam Zheng     qemu_coroutine_yield();
22821cd917fSFam Zheng     s->waiting_for_io = false;
22921cd917fSFam Zheng }
23021cd917fSFam Zheng 
231e5b43573SFam Zheng /* Submit async read while handling COW.
23217612955SJohn Snow  * Returns: The number of sectors copied after and including sector_num,
23317612955SJohn Snow  *          excluding any sectors copied prior to sector_num due to alignment.
23417612955SJohn Snow  *          This will be nb_sectors if no alignment is necessary, or
235e5b43573SFam Zheng  *          (new_end - sector_num) if tail is rounded up or down due to
236e5b43573SFam Zheng  *          alignment or buffer limit.
237402a4741SPaolo Bonzini  */
238e5b43573SFam Zheng static int mirror_do_read(MirrorBlockJob *s, int64_t sector_num,
239e5b43573SFam Zheng                           int nb_sectors)
240e5b43573SFam Zheng {
241e253f4b8SKevin Wolf     BlockBackend *source = s->common.blk;
242e5b43573SFam Zheng     int sectors_per_chunk, nb_chunks;
24317612955SJohn Snow     int ret;
244e5b43573SFam Zheng     MirrorOp *op;
245e4808881SJohn Snow     int max_sectors;
246402a4741SPaolo Bonzini 
247e5b43573SFam Zheng     sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS;
248e4808881SJohn Snow     max_sectors = sectors_per_chunk * s->max_iov;
249e5b43573SFam Zheng 
250e5b43573SFam Zheng     /* We can only handle as much as buf_size at a time. */
251e5b43573SFam Zheng     nb_sectors = MIN(s->buf_size >> BDRV_SECTOR_BITS, nb_sectors);
252e4808881SJohn Snow     nb_sectors = MIN(max_sectors, nb_sectors);
253e5b43573SFam Zheng     assert(nb_sectors);
25417612955SJohn Snow     ret = nb_sectors;
255e5b43573SFam Zheng 
256e5b43573SFam Zheng     if (s->cow_bitmap) {
257e5b43573SFam Zheng         ret += mirror_cow_align(s, &sector_num, &nb_sectors);
258e5b43573SFam Zheng     }
259e5b43573SFam Zheng     assert(nb_sectors << BDRV_SECTOR_BITS <= s->buf_size);
260e5b43573SFam Zheng     /* The sector range must meet granularity because:
261e5b43573SFam Zheng      * 1) Caller passes in aligned values;
262e5b43573SFam Zheng      * 2) mirror_cow_align is used only when target cluster is larger. */
263e5b43573SFam Zheng     assert(!(sector_num % sectors_per_chunk));
2644150ae60SFam Zheng     nb_chunks = DIV_ROUND_UP(nb_sectors, sectors_per_chunk);
265e5b43573SFam Zheng 
266e5b43573SFam Zheng     while (s->buf_free_count < nb_chunks) {
267402a4741SPaolo Bonzini         trace_mirror_yield_in_flight(s, sector_num, s->in_flight);
26821cd917fSFam Zheng         mirror_wait_for_io(s);
269b812f671SPaolo Bonzini     }
270b812f671SPaolo Bonzini 
271bd48bde8SPaolo Bonzini     /* Allocate a MirrorOp that is used as an AIO callback.  */
272c84b3192SPaolo Bonzini     op = g_new(MirrorOp, 1);
273bd48bde8SPaolo Bonzini     op->s = s;
274bd48bde8SPaolo Bonzini     op->sector_num = sector_num;
275bd48bde8SPaolo Bonzini     op->nb_sectors = nb_sectors;
276402a4741SPaolo Bonzini 
277402a4741SPaolo Bonzini     /* Now make a QEMUIOVector taking enough granularity-sized chunks
278402a4741SPaolo Bonzini      * from s->buf_free.
279402a4741SPaolo Bonzini      */
280402a4741SPaolo Bonzini     qemu_iovec_init(&op->qiov, nb_chunks);
281402a4741SPaolo Bonzini     while (nb_chunks-- > 0) {
282402a4741SPaolo Bonzini         MirrorBuffer *buf = QSIMPLEQ_FIRST(&s->buf_free);
283e5b43573SFam Zheng         size_t remaining = nb_sectors * BDRV_SECTOR_SIZE - op->qiov.size;
2845a0f6fd5SKevin Wolf 
285402a4741SPaolo Bonzini         QSIMPLEQ_REMOVE_HEAD(&s->buf_free, next);
286402a4741SPaolo Bonzini         s->buf_free_count--;
2875a0f6fd5SKevin Wolf         qemu_iovec_add(&op->qiov, buf, MIN(s->granularity, remaining));
288402a4741SPaolo Bonzini     }
289402a4741SPaolo Bonzini 
290893f7ebaSPaolo Bonzini     /* Copy the dirty cluster.  */
291bd48bde8SPaolo Bonzini     s->in_flight++;
292b21c7652SMax Reitz     s->sectors_in_flight += nb_sectors;
293b812f671SPaolo Bonzini     trace_mirror_one_iteration(s, sector_num, nb_sectors);
294dcfb3bebSFam Zheng 
29573698c30SEric Blake     blk_aio_preadv(source, sector_num * BDRV_SECTOR_SIZE, &op->qiov, 0,
296bd48bde8SPaolo Bonzini                    mirror_read_complete, op);
297e5b43573SFam Zheng     return ret;
298e5b43573SFam Zheng }
299e5b43573SFam Zheng 
300e5b43573SFam Zheng static void mirror_do_zero_or_discard(MirrorBlockJob *s,
301e5b43573SFam Zheng                                       int64_t sector_num,
302e5b43573SFam Zheng                                       int nb_sectors,
303e5b43573SFam Zheng                                       bool is_discard)
304e5b43573SFam Zheng {
305e5b43573SFam Zheng     MirrorOp *op;
306e5b43573SFam Zheng 
307e5b43573SFam Zheng     /* Allocate a MirrorOp that is used as an AIO callback. The qiov is zeroed
308e5b43573SFam Zheng      * so the freeing in mirror_iteration_done is nop. */
309e5b43573SFam Zheng     op = g_new0(MirrorOp, 1);
310e5b43573SFam Zheng     op->s = s;
311e5b43573SFam Zheng     op->sector_num = sector_num;
312e5b43573SFam Zheng     op->nb_sectors = nb_sectors;
313e5b43573SFam Zheng 
314e5b43573SFam Zheng     s->in_flight++;
315e5b43573SFam Zheng     s->sectors_in_flight += nb_sectors;
316e5b43573SFam Zheng     if (is_discard) {
3171c6c4bb7SEric Blake         blk_aio_pdiscard(s->target, sector_num << BDRV_SECTOR_BITS,
3181c6c4bb7SEric Blake                          op->nb_sectors << BDRV_SECTOR_BITS,
319e5b43573SFam Zheng                          mirror_write_complete, op);
320e5b43573SFam Zheng     } else {
321e253f4b8SKevin Wolf         blk_aio_pwrite_zeroes(s->target, sector_num * BDRV_SECTOR_SIZE,
322e253f4b8SKevin Wolf                               op->nb_sectors * BDRV_SECTOR_SIZE,
323dcfb3bebSFam Zheng                               s->unmap ? BDRV_REQ_MAY_UNMAP : 0,
324dcfb3bebSFam Zheng                               mirror_write_complete, op);
325e5b43573SFam Zheng     }
326e5b43573SFam Zheng }
327e5b43573SFam Zheng 
328e5b43573SFam Zheng static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
329e5b43573SFam Zheng {
330e253f4b8SKevin Wolf     BlockDriverState *source = blk_bs(s->common.blk);
3319c83625bSMax Reitz     int64_t sector_num, first_chunk;
332e5b43573SFam Zheng     uint64_t delay_ns = 0;
333e5b43573SFam Zheng     /* At least the first dirty chunk is mirrored in one iteration. */
334e5b43573SFam Zheng     int nb_chunks = 1;
335e5b43573SFam Zheng     int64_t end = s->bdev_length / BDRV_SECTOR_SIZE;
336e5b43573SFam Zheng     int sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS;
3374b5004d9SDenis V. Lunev     bool write_zeroes_ok = bdrv_can_write_zeroes_with_unmap(blk_bs(s->target));
3380965a41eSVladimir Sementsov-Ogievskiy     int max_io_sectors = MAX((s->buf_size >> BDRV_SECTOR_BITS) / MAX_IN_FLIGHT,
3390965a41eSVladimir Sementsov-Ogievskiy                              MAX_IO_SECTORS);
340e5b43573SFam Zheng 
341dc162c8eSFam Zheng     sector_num = bdrv_dirty_iter_next(s->dbi);
342e5b43573SFam Zheng     if (sector_num < 0) {
343dc162c8eSFam Zheng         bdrv_set_dirty_iter(s->dbi, 0);
344dc162c8eSFam Zheng         sector_num = bdrv_dirty_iter_next(s->dbi);
345e5b43573SFam Zheng         trace_mirror_restart_iter(s, bdrv_get_dirty_count(s->dirty_bitmap));
346e5b43573SFam Zheng         assert(sector_num >= 0);
347e5b43573SFam Zheng     }
348e5b43573SFam Zheng 
3499c83625bSMax Reitz     first_chunk = sector_num / sectors_per_chunk;
3509c83625bSMax Reitz     while (test_bit(first_chunk, s->in_flight_bitmap)) {
351ff04198bSDenis V. Lunev         trace_mirror_yield_in_flight(s, sector_num, s->in_flight);
3529c83625bSMax Reitz         mirror_wait_for_io(s);
3539c83625bSMax Reitz     }
3549c83625bSMax Reitz 
355565ac01fSStefan Hajnoczi     block_job_pause_point(&s->common);
356565ac01fSStefan Hajnoczi 
357e5b43573SFam Zheng     /* Find the number of consective dirty chunks following the first dirty
358e5b43573SFam Zheng      * one, and wait for in flight requests in them. */
359e5b43573SFam Zheng     while (nb_chunks * sectors_per_chunk < (s->buf_size >> BDRV_SECTOR_BITS)) {
360dc162c8eSFam Zheng         int64_t next_dirty;
361e5b43573SFam Zheng         int64_t next_sector = sector_num + nb_chunks * sectors_per_chunk;
362e5b43573SFam Zheng         int64_t next_chunk = next_sector / sectors_per_chunk;
363e5b43573SFam Zheng         if (next_sector >= end ||
364e5b43573SFam Zheng             !bdrv_get_dirty(source, s->dirty_bitmap, next_sector)) {
365e5b43573SFam Zheng             break;
366e5b43573SFam Zheng         }
367e5b43573SFam Zheng         if (test_bit(next_chunk, s->in_flight_bitmap)) {
368e5b43573SFam Zheng             break;
369e5b43573SFam Zheng         }
3709c83625bSMax Reitz 
371dc162c8eSFam Zheng         next_dirty = bdrv_dirty_iter_next(s->dbi);
372dc162c8eSFam Zheng         if (next_dirty > next_sector || next_dirty < 0) {
373f27a2742SMax Reitz             /* The bitmap iterator's cache is stale, refresh it */
374dc162c8eSFam Zheng             bdrv_set_dirty_iter(s->dbi, next_sector);
375dc162c8eSFam Zheng             next_dirty = bdrv_dirty_iter_next(s->dbi);
376f27a2742SMax Reitz         }
377dc162c8eSFam Zheng         assert(next_dirty == next_sector);
378e5b43573SFam Zheng         nb_chunks++;
379e5b43573SFam Zheng     }
380e5b43573SFam Zheng 
381e5b43573SFam Zheng     /* Clear dirty bits before querying the block status, because
382e5b43573SFam Zheng      * calling bdrv_get_block_status_above could yield - if some blocks are
383e5b43573SFam Zheng      * marked dirty in this window, we need to know.
384e5b43573SFam Zheng      */
385e5b43573SFam Zheng     bdrv_reset_dirty_bitmap(s->dirty_bitmap, sector_num,
386e5b43573SFam Zheng                             nb_chunks * sectors_per_chunk);
387e5b43573SFam Zheng     bitmap_set(s->in_flight_bitmap, sector_num / sectors_per_chunk, nb_chunks);
388e5b43573SFam Zheng     while (nb_chunks > 0 && sector_num < end) {
389e5b43573SFam Zheng         int ret;
3904b5004d9SDenis V. Lunev         int io_sectors, io_sectors_acct;
391e5b43573SFam Zheng         BlockDriverState *file;
392e5b43573SFam Zheng         enum MirrorMethod {
393e5b43573SFam Zheng             MIRROR_METHOD_COPY,
394e5b43573SFam Zheng             MIRROR_METHOD_ZERO,
395e5b43573SFam Zheng             MIRROR_METHOD_DISCARD
396e5b43573SFam Zheng         } mirror_method = MIRROR_METHOD_COPY;
397e5b43573SFam Zheng 
398e5b43573SFam Zheng         assert(!(sector_num % sectors_per_chunk));
399e5b43573SFam Zheng         ret = bdrv_get_block_status_above(source, NULL, sector_num,
400e5b43573SFam Zheng                                           nb_chunks * sectors_per_chunk,
401e5b43573SFam Zheng                                           &io_sectors, &file);
402e5b43573SFam Zheng         if (ret < 0) {
4030965a41eSVladimir Sementsov-Ogievskiy             io_sectors = MIN(nb_chunks * sectors_per_chunk, max_io_sectors);
4040965a41eSVladimir Sementsov-Ogievskiy         } else if (ret & BDRV_BLOCK_DATA) {
4050965a41eSVladimir Sementsov-Ogievskiy             io_sectors = MIN(io_sectors, max_io_sectors);
406e5b43573SFam Zheng         }
407e5b43573SFam Zheng 
408e5b43573SFam Zheng         io_sectors -= io_sectors % sectors_per_chunk;
409e5b43573SFam Zheng         if (io_sectors < sectors_per_chunk) {
410e5b43573SFam Zheng             io_sectors = sectors_per_chunk;
411e5b43573SFam Zheng         } else if (ret >= 0 && !(ret & BDRV_BLOCK_DATA)) {
412e5b43573SFam Zheng             int64_t target_sector_num;
413e5b43573SFam Zheng             int target_nb_sectors;
414244483e6SKevin Wolf             bdrv_round_sectors_to_clusters(blk_bs(s->target), sector_num,
415244483e6SKevin Wolf                                            io_sectors,  &target_sector_num,
416244483e6SKevin Wolf                                            &target_nb_sectors);
417e5b43573SFam Zheng             if (target_sector_num == sector_num &&
418e5b43573SFam Zheng                 target_nb_sectors == io_sectors) {
419e5b43573SFam Zheng                 mirror_method = ret & BDRV_BLOCK_ZERO ?
420e5b43573SFam Zheng                                     MIRROR_METHOD_ZERO :
421e5b43573SFam Zheng                                     MIRROR_METHOD_DISCARD;
422e5b43573SFam Zheng             }
423e5b43573SFam Zheng         }
424e5b43573SFam Zheng 
425cf56a3c6SDenis V. Lunev         while (s->in_flight >= MAX_IN_FLIGHT) {
426cf56a3c6SDenis V. Lunev             trace_mirror_yield_in_flight(s, sector_num, s->in_flight);
427cf56a3c6SDenis V. Lunev             mirror_wait_for_io(s);
428cf56a3c6SDenis V. Lunev         }
429cf56a3c6SDenis V. Lunev 
430dbaa7b57SVladimir Sementsov-Ogievskiy         if (s->ret < 0) {
431dbaa7b57SVladimir Sementsov-Ogievskiy             return 0;
432dbaa7b57SVladimir Sementsov-Ogievskiy         }
433dbaa7b57SVladimir Sementsov-Ogievskiy 
4344150ae60SFam Zheng         mirror_clip_sectors(s, sector_num, &io_sectors);
435e5b43573SFam Zheng         switch (mirror_method) {
436e5b43573SFam Zheng         case MIRROR_METHOD_COPY:
437e5b43573SFam Zheng             io_sectors = mirror_do_read(s, sector_num, io_sectors);
4384b5004d9SDenis V. Lunev             io_sectors_acct = io_sectors;
439e5b43573SFam Zheng             break;
440e5b43573SFam Zheng         case MIRROR_METHOD_ZERO:
441e5b43573SFam Zheng         case MIRROR_METHOD_DISCARD:
4424b5004d9SDenis V. Lunev             mirror_do_zero_or_discard(s, sector_num, io_sectors,
4434b5004d9SDenis V. Lunev                                       mirror_method == MIRROR_METHOD_DISCARD);
4444b5004d9SDenis V. Lunev             if (write_zeroes_ok) {
4454b5004d9SDenis V. Lunev                 io_sectors_acct = 0;
4464b5004d9SDenis V. Lunev             } else {
4474b5004d9SDenis V. Lunev                 io_sectors_acct = io_sectors;
4484b5004d9SDenis V. Lunev             }
449e5b43573SFam Zheng             break;
450e5b43573SFam Zheng         default:
451e5b43573SFam Zheng             abort();
452e5b43573SFam Zheng         }
453e5b43573SFam Zheng         assert(io_sectors);
454e5b43573SFam Zheng         sector_num += io_sectors;
4554150ae60SFam Zheng         nb_chunks -= DIV_ROUND_UP(io_sectors, sectors_per_chunk);
456f14a39ccSSascha Silbe         if (s->common.speed) {
4574b5004d9SDenis V. Lunev             delay_ns = ratelimit_calculate_delay(&s->limit, io_sectors_acct);
458f14a39ccSSascha Silbe         }
459dcfb3bebSFam Zheng     }
460cc8c9d6cSPaolo Bonzini     return delay_ns;
461893f7ebaSPaolo Bonzini }
462b952b558SPaolo Bonzini 
463402a4741SPaolo Bonzini static void mirror_free_init(MirrorBlockJob *s)
464402a4741SPaolo Bonzini {
465402a4741SPaolo Bonzini     int granularity = s->granularity;
466402a4741SPaolo Bonzini     size_t buf_size = s->buf_size;
467402a4741SPaolo Bonzini     uint8_t *buf = s->buf;
468402a4741SPaolo Bonzini 
469402a4741SPaolo Bonzini     assert(s->buf_free_count == 0);
470402a4741SPaolo Bonzini     QSIMPLEQ_INIT(&s->buf_free);
471402a4741SPaolo Bonzini     while (buf_size != 0) {
472402a4741SPaolo Bonzini         MirrorBuffer *cur = (MirrorBuffer *)buf;
473402a4741SPaolo Bonzini         QSIMPLEQ_INSERT_TAIL(&s->buf_free, cur, next);
474402a4741SPaolo Bonzini         s->buf_free_count++;
475402a4741SPaolo Bonzini         buf_size -= granularity;
476402a4741SPaolo Bonzini         buf += granularity;
477402a4741SPaolo Bonzini     }
478402a4741SPaolo Bonzini }
479402a4741SPaolo Bonzini 
480bae8196dSPaolo Bonzini /* This is also used for the .pause callback. There is no matching
481bae8196dSPaolo Bonzini  * mirror_resume() because mirror_run() will begin iterating again
482bae8196dSPaolo Bonzini  * when the job is resumed.
483bae8196dSPaolo Bonzini  */
484bae8196dSPaolo Bonzini static void mirror_wait_for_all_io(MirrorBlockJob *s)
485bd48bde8SPaolo Bonzini {
486bd48bde8SPaolo Bonzini     while (s->in_flight > 0) {
48721cd917fSFam Zheng         mirror_wait_for_io(s);
488bd48bde8SPaolo Bonzini     }
489893f7ebaSPaolo Bonzini }
490893f7ebaSPaolo Bonzini 
4915a7e7a0bSStefan Hajnoczi typedef struct {
4925a7e7a0bSStefan Hajnoczi     int ret;
4935a7e7a0bSStefan Hajnoczi } MirrorExitData;
4945a7e7a0bSStefan Hajnoczi 
4955a7e7a0bSStefan Hajnoczi static void mirror_exit(BlockJob *job, void *opaque)
4965a7e7a0bSStefan Hajnoczi {
4975a7e7a0bSStefan Hajnoczi     MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
4985a7e7a0bSStefan Hajnoczi     MirrorExitData *data = opaque;
4995a7e7a0bSStefan Hajnoczi     AioContext *replace_aio_context = NULL;
500e253f4b8SKevin Wolf     BlockDriverState *src = blk_bs(s->common.blk);
501e253f4b8SKevin Wolf     BlockDriverState *target_bs = blk_bs(s->target);
5023f09bfbcSKevin Wolf 
5033f09bfbcSKevin Wolf     /* Make sure that the source BDS doesn't go away before we called
5043f09bfbcSKevin Wolf      * block_job_completed(). */
5053f09bfbcSKevin Wolf     bdrv_ref(src);
5065a7e7a0bSStefan Hajnoczi 
5075a7e7a0bSStefan Hajnoczi     if (s->to_replace) {
5085a7e7a0bSStefan Hajnoczi         replace_aio_context = bdrv_get_aio_context(s->to_replace);
5095a7e7a0bSStefan Hajnoczi         aio_context_acquire(replace_aio_context);
5105a7e7a0bSStefan Hajnoczi     }
5115a7e7a0bSStefan Hajnoczi 
5125a7e7a0bSStefan Hajnoczi     if (s->should_complete && data->ret == 0) {
513e253f4b8SKevin Wolf         BlockDriverState *to_replace = src;
5145a7e7a0bSStefan Hajnoczi         if (s->to_replace) {
5155a7e7a0bSStefan Hajnoczi             to_replace = s->to_replace;
5165a7e7a0bSStefan Hajnoczi         }
51740365552SKevin Wolf 
518e253f4b8SKevin Wolf         if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) {
519e253f4b8SKevin Wolf             bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL);
5205a7e7a0bSStefan Hajnoczi         }
521b8804815SKevin Wolf 
522b8804815SKevin Wolf         /* The mirror job has no requests in flight any more, but we need to
523b8804815SKevin Wolf          * drain potential other users of the BDS before changing the graph. */
524e253f4b8SKevin Wolf         bdrv_drained_begin(target_bs);
525e253f4b8SKevin Wolf         bdrv_replace_in_backing_chain(to_replace, target_bs);
526e253f4b8SKevin Wolf         bdrv_drained_end(target_bs);
527b8804815SKevin Wolf 
528b6d2e599SKevin Wolf         /* We just changed the BDS the job BB refers to */
529b6d2e599SKevin Wolf         blk_remove_bs(job->blk);
530b6d2e599SKevin Wolf         blk_insert_bs(job->blk, src);
5315a7e7a0bSStefan Hajnoczi     }
5325a7e7a0bSStefan Hajnoczi     if (s->to_replace) {
5335a7e7a0bSStefan Hajnoczi         bdrv_op_unblock_all(s->to_replace, s->replace_blocker);
5345a7e7a0bSStefan Hajnoczi         error_free(s->replace_blocker);
5355a7e7a0bSStefan Hajnoczi         bdrv_unref(s->to_replace);
5365a7e7a0bSStefan Hajnoczi     }
5375a7e7a0bSStefan Hajnoczi     if (replace_aio_context) {
5385a7e7a0bSStefan Hajnoczi         aio_context_release(replace_aio_context);
5395a7e7a0bSStefan Hajnoczi     }
5405a7e7a0bSStefan Hajnoczi     g_free(s->replaces);
541e253f4b8SKevin Wolf     blk_unref(s->target);
542bae8196dSPaolo Bonzini     s->target = NULL;
5435a7e7a0bSStefan Hajnoczi     block_job_completed(&s->common, data->ret);
5445a7e7a0bSStefan Hajnoczi     g_free(data);
545176c3699SFam Zheng     bdrv_drained_end(src);
5463f09bfbcSKevin Wolf     bdrv_unref(src);
5475a7e7a0bSStefan Hajnoczi }
5485a7e7a0bSStefan Hajnoczi 
54949efb1f5SDenis V. Lunev static void mirror_throttle(MirrorBlockJob *s)
55049efb1f5SDenis V. Lunev {
55149efb1f5SDenis V. Lunev     int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
55249efb1f5SDenis V. Lunev 
55349efb1f5SDenis V. Lunev     if (now - s->last_pause_ns > SLICE_TIME) {
55449efb1f5SDenis V. Lunev         s->last_pause_ns = now;
55549efb1f5SDenis V. Lunev         block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, 0);
55649efb1f5SDenis V. Lunev     } else {
55749efb1f5SDenis V. Lunev         block_job_pause_point(&s->common);
55849efb1f5SDenis V. Lunev     }
55949efb1f5SDenis V. Lunev }
56049efb1f5SDenis V. Lunev 
561c0b363adSDenis V. Lunev static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
562c0b363adSDenis V. Lunev {
563c0b363adSDenis V. Lunev     int64_t sector_num, end;
564c0b363adSDenis V. Lunev     BlockDriverState *base = s->base;
565c0b363adSDenis V. Lunev     BlockDriverState *bs = blk_bs(s->common.blk);
566c0b363adSDenis V. Lunev     BlockDriverState *target_bs = blk_bs(s->target);
567c0b363adSDenis V. Lunev     int ret, n;
568c0b363adSDenis V. Lunev 
569c0b363adSDenis V. Lunev     end = s->bdev_length / BDRV_SECTOR_SIZE;
570c0b363adSDenis V. Lunev 
571b7d5062cSDenis V. Lunev     if (base == NULL && !bdrv_has_zero_init(target_bs)) {
572c7c2769cSDenis V. Lunev         if (!bdrv_can_write_zeroes_with_unmap(target_bs)) {
573b7d5062cSDenis V. Lunev             bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, end);
574b7d5062cSDenis V. Lunev             return 0;
575b7d5062cSDenis V. Lunev         }
576b7d5062cSDenis V. Lunev 
57790ab48ebSAnton Nefedov         s->initial_zeroing_ongoing = true;
578c7c2769cSDenis V. Lunev         for (sector_num = 0; sector_num < end; ) {
579c7c2769cSDenis V. Lunev             int nb_sectors = MIN(end - sector_num,
580c7c2769cSDenis V. Lunev                 QEMU_ALIGN_DOWN(INT_MAX, s->granularity) >> BDRV_SECTOR_BITS);
581c7c2769cSDenis V. Lunev 
582c7c2769cSDenis V. Lunev             mirror_throttle(s);
583c7c2769cSDenis V. Lunev 
584c7c2769cSDenis V. Lunev             if (block_job_is_cancelled(&s->common)) {
58590ab48ebSAnton Nefedov                 s->initial_zeroing_ongoing = false;
586c7c2769cSDenis V. Lunev                 return 0;
587c7c2769cSDenis V. Lunev             }
588c7c2769cSDenis V. Lunev 
589c7c2769cSDenis V. Lunev             if (s->in_flight >= MAX_IN_FLIGHT) {
590c7c2769cSDenis V. Lunev                 trace_mirror_yield(s, s->in_flight, s->buf_free_count, -1);
591c7c2769cSDenis V. Lunev                 mirror_wait_for_io(s);
592c7c2769cSDenis V. Lunev                 continue;
593c7c2769cSDenis V. Lunev             }
594c7c2769cSDenis V. Lunev 
595c7c2769cSDenis V. Lunev             mirror_do_zero_or_discard(s, sector_num, nb_sectors, false);
596c7c2769cSDenis V. Lunev             sector_num += nb_sectors;
597c7c2769cSDenis V. Lunev         }
598c7c2769cSDenis V. Lunev 
599bae8196dSPaolo Bonzini         mirror_wait_for_all_io(s);
60090ab48ebSAnton Nefedov         s->initial_zeroing_ongoing = false;
601c7c2769cSDenis V. Lunev     }
602c7c2769cSDenis V. Lunev 
603c0b363adSDenis V. Lunev     /* First part, loop on the sectors and initialize the dirty bitmap.  */
604c0b363adSDenis V. Lunev     for (sector_num = 0; sector_num < end; ) {
605c0b363adSDenis V. Lunev         /* Just to make sure we are not exceeding int limit. */
606c0b363adSDenis V. Lunev         int nb_sectors = MIN(INT_MAX >> BDRV_SECTOR_BITS,
607c0b363adSDenis V. Lunev                              end - sector_num);
608c0b363adSDenis V. Lunev 
609c0b363adSDenis V. Lunev         mirror_throttle(s);
610c0b363adSDenis V. Lunev 
611c0b363adSDenis V. Lunev         if (block_job_is_cancelled(&s->common)) {
612c0b363adSDenis V. Lunev             return 0;
613c0b363adSDenis V. Lunev         }
614c0b363adSDenis V. Lunev 
615c0b363adSDenis V. Lunev         ret = bdrv_is_allocated_above(bs, base, sector_num, nb_sectors, &n);
616c0b363adSDenis V. Lunev         if (ret < 0) {
617c0b363adSDenis V. Lunev             return ret;
618c0b363adSDenis V. Lunev         }
619c0b363adSDenis V. Lunev 
620c0b363adSDenis V. Lunev         assert(n > 0);
621b7d5062cSDenis V. Lunev         if (ret == 1) {
622c0b363adSDenis V. Lunev             bdrv_set_dirty_bitmap(s->dirty_bitmap, sector_num, n);
623c0b363adSDenis V. Lunev         }
624c0b363adSDenis V. Lunev         sector_num += n;
625c0b363adSDenis V. Lunev     }
626c0b363adSDenis V. Lunev     return 0;
627c0b363adSDenis V. Lunev }
628c0b363adSDenis V. Lunev 
629bdffb31dSPaolo Bonzini /* Called when going out of the streaming phase to flush the bulk of the
630bdffb31dSPaolo Bonzini  * data to the medium, or just before completing.
631bdffb31dSPaolo Bonzini  */
632bdffb31dSPaolo Bonzini static int mirror_flush(MirrorBlockJob *s)
633bdffb31dSPaolo Bonzini {
634bdffb31dSPaolo Bonzini     int ret = blk_flush(s->target);
635bdffb31dSPaolo Bonzini     if (ret < 0) {
636bdffb31dSPaolo Bonzini         if (mirror_error_action(s, false, -ret) == BLOCK_ERROR_ACTION_REPORT) {
637bdffb31dSPaolo Bonzini             s->ret = ret;
638bdffb31dSPaolo Bonzini         }
639bdffb31dSPaolo Bonzini     }
640bdffb31dSPaolo Bonzini     return ret;
641bdffb31dSPaolo Bonzini }
642bdffb31dSPaolo Bonzini 
643893f7ebaSPaolo Bonzini static void coroutine_fn mirror_run(void *opaque)
644893f7ebaSPaolo Bonzini {
645893f7ebaSPaolo Bonzini     MirrorBlockJob *s = opaque;
6465a7e7a0bSStefan Hajnoczi     MirrorExitData *data;
647e253f4b8SKevin Wolf     BlockDriverState *bs = blk_bs(s->common.blk);
648e253f4b8SKevin Wolf     BlockDriverState *target_bs = blk_bs(s->target);
6499a0cec66SPaolo Bonzini     bool need_drain = true;
650c0b363adSDenis V. Lunev     int64_t length;
651b812f671SPaolo Bonzini     BlockDriverInfo bdi;
6521d33936eSJeff Cody     char backing_filename[2]; /* we only need 2 characters because we are only
6531d33936eSJeff Cody                                  checking for a NULL string */
654893f7ebaSPaolo Bonzini     int ret = 0;
655e5b43573SFam Zheng     int target_cluster_size = BDRV_SECTOR_SIZE;
656893f7ebaSPaolo Bonzini 
657893f7ebaSPaolo Bonzini     if (block_job_is_cancelled(&s->common)) {
658893f7ebaSPaolo Bonzini         goto immediate_exit;
659893f7ebaSPaolo Bonzini     }
660893f7ebaSPaolo Bonzini 
661b21c7652SMax Reitz     s->bdev_length = bdrv_getlength(bs);
662b21c7652SMax Reitz     if (s->bdev_length < 0) {
663b21c7652SMax Reitz         ret = s->bdev_length;
664373df5b1SFam Zheng         goto immediate_exit;
665*becc347eSKevin Wolf     }
666*becc347eSKevin Wolf 
667*becc347eSKevin Wolf     /* Active commit must resize the base image if its size differs from the
668*becc347eSKevin Wolf      * active layer. */
669*becc347eSKevin Wolf     if (s->base == blk_bs(s->target)) {
670*becc347eSKevin Wolf         int64_t base_length;
671*becc347eSKevin Wolf 
672*becc347eSKevin Wolf         base_length = blk_getlength(s->target);
673*becc347eSKevin Wolf         if (base_length < 0) {
674*becc347eSKevin Wolf             ret = base_length;
675*becc347eSKevin Wolf             goto immediate_exit;
676*becc347eSKevin Wolf         }
677*becc347eSKevin Wolf 
678*becc347eSKevin Wolf         if (s->bdev_length > base_length) {
679*becc347eSKevin Wolf             ret = blk_truncate(s->target, s->bdev_length);
680*becc347eSKevin Wolf             if (ret < 0) {
681*becc347eSKevin Wolf                 goto immediate_exit;
682*becc347eSKevin Wolf             }
683*becc347eSKevin Wolf         }
684*becc347eSKevin Wolf     }
685*becc347eSKevin Wolf 
686*becc347eSKevin Wolf     if (s->bdev_length == 0) {
6879e48b025SFam Zheng         /* Report BLOCK_JOB_READY and wait for complete. */
6889e48b025SFam Zheng         block_job_event_ready(&s->common);
6899e48b025SFam Zheng         s->synced = true;
6909e48b025SFam Zheng         while (!block_job_is_cancelled(&s->common) && !s->should_complete) {
6919e48b025SFam Zheng             block_job_yield(&s->common);
6929e48b025SFam Zheng         }
6939e48b025SFam Zheng         s->common.cancelled = false;
6949e48b025SFam Zheng         goto immediate_exit;
695893f7ebaSPaolo Bonzini     }
696893f7ebaSPaolo Bonzini 
697b21c7652SMax Reitz     length = DIV_ROUND_UP(s->bdev_length, s->granularity);
698402a4741SPaolo Bonzini     s->in_flight_bitmap = bitmap_new(length);
699402a4741SPaolo Bonzini 
700b812f671SPaolo Bonzini     /* If we have no backing file yet in the destination, we cannot let
701b812f671SPaolo Bonzini      * the destination do COW.  Instead, we copy sectors around the
702b812f671SPaolo Bonzini      * dirty data if needed.  We need a bitmap to do that.
703b812f671SPaolo Bonzini      */
704e253f4b8SKevin Wolf     bdrv_get_backing_filename(target_bs, backing_filename,
705b812f671SPaolo Bonzini                               sizeof(backing_filename));
706e253f4b8SKevin Wolf     if (!bdrv_get_info(target_bs, &bdi) && bdi.cluster_size) {
707e5b43573SFam Zheng         target_cluster_size = bdi.cluster_size;
708c3cc95bdSFam Zheng     }
709e253f4b8SKevin Wolf     if (backing_filename[0] && !target_bs->backing
710e5b43573SFam Zheng         && s->granularity < target_cluster_size) {
711e5b43573SFam Zheng         s->buf_size = MAX(s->buf_size, target_cluster_size);
712b812f671SPaolo Bonzini         s->cow_bitmap = bitmap_new(length);
713b812f671SPaolo Bonzini     }
714e5b43573SFam Zheng     s->target_cluster_sectors = target_cluster_size >> BDRV_SECTOR_BITS;
715e253f4b8SKevin Wolf     s->max_iov = MIN(bs->bl.max_iov, target_bs->bl.max_iov);
716b812f671SPaolo Bonzini 
7177504edf4SKevin Wolf     s->buf = qemu_try_blockalign(bs, s->buf_size);
7187504edf4SKevin Wolf     if (s->buf == NULL) {
7197504edf4SKevin Wolf         ret = -ENOMEM;
7207504edf4SKevin Wolf         goto immediate_exit;
7217504edf4SKevin Wolf     }
7227504edf4SKevin Wolf 
723402a4741SPaolo Bonzini     mirror_free_init(s);
724893f7ebaSPaolo Bonzini 
72549efb1f5SDenis V. Lunev     s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
72603544a6eSFam Zheng     if (!s->is_none_mode) {
727c0b363adSDenis V. Lunev         ret = mirror_dirty_init(s);
728c0b363adSDenis V. Lunev         if (ret < 0 || block_job_is_cancelled(&s->common)) {
7294c0cbd6fSFam Zheng             goto immediate_exit;
7304c0cbd6fSFam Zheng         }
731893f7ebaSPaolo Bonzini     }
732893f7ebaSPaolo Bonzini 
733dc162c8eSFam Zheng     assert(!s->dbi);
734dc162c8eSFam Zheng     s->dbi = bdrv_dirty_iter_new(s->dirty_bitmap, 0);
735893f7ebaSPaolo Bonzini     for (;;) {
736cc8c9d6cSPaolo Bonzini         uint64_t delay_ns = 0;
73749efb1f5SDenis V. Lunev         int64_t cnt, delta;
738893f7ebaSPaolo Bonzini         bool should_complete;
739893f7ebaSPaolo Bonzini 
740bd48bde8SPaolo Bonzini         if (s->ret < 0) {
741bd48bde8SPaolo Bonzini             ret = s->ret;
742893f7ebaSPaolo Bonzini             goto immediate_exit;
743893f7ebaSPaolo Bonzini         }
744bd48bde8SPaolo Bonzini 
745565ac01fSStefan Hajnoczi         block_job_pause_point(&s->common);
746565ac01fSStefan Hajnoczi 
74720dca810SJohn Snow         cnt = bdrv_get_dirty_count(s->dirty_bitmap);
748b21c7652SMax Reitz         /* s->common.offset contains the number of bytes already processed so
749b21c7652SMax Reitz          * far, cnt is the number of dirty sectors remaining and
750b21c7652SMax Reitz          * s->sectors_in_flight is the number of sectors currently being
751b21c7652SMax Reitz          * processed; together those are the current total operation length */
752b21c7652SMax Reitz         s->common.len = s->common.offset +
753b21c7652SMax Reitz                         (cnt + s->sectors_in_flight) * BDRV_SECTOR_SIZE;
754bd48bde8SPaolo Bonzini 
755bd48bde8SPaolo Bonzini         /* Note that even when no rate limit is applied we need to yield
756a7282330SFam Zheng          * periodically with no pending I/O so that bdrv_drain_all() returns.
757bd48bde8SPaolo Bonzini          * We do so every SLICE_TIME nanoseconds, or when there is an error,
758bd48bde8SPaolo Bonzini          * or when the source is clean, whichever comes first.
759bd48bde8SPaolo Bonzini          */
76049efb1f5SDenis V. Lunev         delta = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - s->last_pause_ns;
76149efb1f5SDenis V. Lunev         if (delta < SLICE_TIME &&
762bd48bde8SPaolo Bonzini             s->common.iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
763cf56a3c6SDenis V. Lunev             if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 ||
764402a4741SPaolo Bonzini                 (cnt == 0 && s->in_flight > 0)) {
765402a4741SPaolo Bonzini                 trace_mirror_yield(s, s->in_flight, s->buf_free_count, cnt);
76621cd917fSFam Zheng                 mirror_wait_for_io(s);
767bd48bde8SPaolo Bonzini                 continue;
768bd48bde8SPaolo Bonzini             } else if (cnt != 0) {
769cc8c9d6cSPaolo Bonzini                 delay_ns = mirror_iteration(s);
770893f7ebaSPaolo Bonzini             }
771cc8c9d6cSPaolo Bonzini         }
772893f7ebaSPaolo Bonzini 
773893f7ebaSPaolo Bonzini         should_complete = false;
774bd48bde8SPaolo Bonzini         if (s->in_flight == 0 && cnt == 0) {
775893f7ebaSPaolo Bonzini             trace_mirror_before_flush(s);
776bdffb31dSPaolo Bonzini             if (!s->synced) {
777bdffb31dSPaolo Bonzini                 if (mirror_flush(s) < 0) {
778bdffb31dSPaolo Bonzini                     /* Go check s->ret.  */
779bdffb31dSPaolo Bonzini                     continue;
780893f7ebaSPaolo Bonzini                 }
781893f7ebaSPaolo Bonzini                 /* We're out of the streaming phase.  From now on, if the job
782893f7ebaSPaolo Bonzini                  * is cancelled we will actually complete all pending I/O and
783893f7ebaSPaolo Bonzini                  * report completion.  This way, block-job-cancel will leave
784893f7ebaSPaolo Bonzini                  * the target in a consistent state.
785893f7ebaSPaolo Bonzini                  */
786bcada37bSWenchao Xia                 block_job_event_ready(&s->common);
787d63ffd87SPaolo Bonzini                 s->synced = true;
788d63ffd87SPaolo Bonzini             }
789d63ffd87SPaolo Bonzini 
790d63ffd87SPaolo Bonzini             should_complete = s->should_complete ||
791d63ffd87SPaolo Bonzini                 block_job_is_cancelled(&s->common);
79220dca810SJohn Snow             cnt = bdrv_get_dirty_count(s->dirty_bitmap);
793893f7ebaSPaolo Bonzini         }
794893f7ebaSPaolo Bonzini 
795893f7ebaSPaolo Bonzini         if (cnt == 0 && should_complete) {
796893f7ebaSPaolo Bonzini             /* The dirty bitmap is not updated while operations are pending.
797893f7ebaSPaolo Bonzini              * If we're about to exit, wait for pending operations before
798893f7ebaSPaolo Bonzini              * calling bdrv_get_dirty_count(bs), or we may exit while the
799893f7ebaSPaolo Bonzini              * source has dirty data to copy!
800893f7ebaSPaolo Bonzini              *
801893f7ebaSPaolo Bonzini              * Note that I/O can be submitted by the guest while
8029a0cec66SPaolo Bonzini              * mirror_populate runs, so pause it now.  Before deciding
8039a0cec66SPaolo Bonzini              * whether to switch to target check one last time if I/O has
8049a0cec66SPaolo Bonzini              * come in the meanwhile, and if not flush the data to disk.
805893f7ebaSPaolo Bonzini              */
806893f7ebaSPaolo Bonzini             trace_mirror_before_drain(s, cnt);
8079a0cec66SPaolo Bonzini 
8089a0cec66SPaolo Bonzini             bdrv_drained_begin(bs);
80920dca810SJohn Snow             cnt = bdrv_get_dirty_count(s->dirty_bitmap);
810bdffb31dSPaolo Bonzini             if (cnt > 0 || mirror_flush(s) < 0) {
8119a0cec66SPaolo Bonzini                 bdrv_drained_end(bs);
8129a0cec66SPaolo Bonzini                 continue;
8139a0cec66SPaolo Bonzini             }
8149a0cec66SPaolo Bonzini 
8159a0cec66SPaolo Bonzini             /* The two disks are in sync.  Exit and report successful
8169a0cec66SPaolo Bonzini              * completion.
8179a0cec66SPaolo Bonzini              */
8189a0cec66SPaolo Bonzini             assert(QLIST_EMPTY(&bs->tracked_requests));
8199a0cec66SPaolo Bonzini             s->common.cancelled = false;
8209a0cec66SPaolo Bonzini             need_drain = false;
8219a0cec66SPaolo Bonzini             break;
822893f7ebaSPaolo Bonzini         }
823893f7ebaSPaolo Bonzini 
824893f7ebaSPaolo Bonzini         ret = 0;
825cc8c9d6cSPaolo Bonzini         trace_mirror_before_sleep(s, cnt, s->synced, delay_ns);
826d63ffd87SPaolo Bonzini         if (!s->synced) {
8277483d1e5SAlex Bligh             block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns);
828893f7ebaSPaolo Bonzini             if (block_job_is_cancelled(&s->common)) {
829893f7ebaSPaolo Bonzini                 break;
830893f7ebaSPaolo Bonzini             }
831893f7ebaSPaolo Bonzini         } else if (!should_complete) {
832bd48bde8SPaolo Bonzini             delay_ns = (s->in_flight == 0 && cnt == 0 ? SLICE_TIME : 0);
8337483d1e5SAlex Bligh             block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns);
834893f7ebaSPaolo Bonzini         }
83549efb1f5SDenis V. Lunev         s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
836893f7ebaSPaolo Bonzini     }
837893f7ebaSPaolo Bonzini 
838893f7ebaSPaolo Bonzini immediate_exit:
839bd48bde8SPaolo Bonzini     if (s->in_flight > 0) {
840bd48bde8SPaolo Bonzini         /* We get here only if something went wrong.  Either the job failed,
841bd48bde8SPaolo Bonzini          * or it was cancelled prematurely so that we do not guarantee that
842bd48bde8SPaolo Bonzini          * the target is a copy of the source.
843bd48bde8SPaolo Bonzini          */
844bd48bde8SPaolo Bonzini         assert(ret < 0 || (!s->synced && block_job_is_cancelled(&s->common)));
8459a0cec66SPaolo Bonzini         assert(need_drain);
846bae8196dSPaolo Bonzini         mirror_wait_for_all_io(s);
847bd48bde8SPaolo Bonzini     }
848bd48bde8SPaolo Bonzini 
849bd48bde8SPaolo Bonzini     assert(s->in_flight == 0);
8507191bf31SMarkus Armbruster     qemu_vfree(s->buf);
851b812f671SPaolo Bonzini     g_free(s->cow_bitmap);
852402a4741SPaolo Bonzini     g_free(s->in_flight_bitmap);
853dc162c8eSFam Zheng     bdrv_dirty_iter_free(s->dbi);
854e4654d2dSFam Zheng     bdrv_release_dirty_bitmap(bs, s->dirty_bitmap);
8555a7e7a0bSStefan Hajnoczi 
8565a7e7a0bSStefan Hajnoczi     data = g_malloc(sizeof(*data));
8575a7e7a0bSStefan Hajnoczi     data->ret = ret;
8589a0cec66SPaolo Bonzini 
8599a0cec66SPaolo Bonzini     if (need_drain) {
860e253f4b8SKevin Wolf         bdrv_drained_begin(bs);
8619a0cec66SPaolo Bonzini     }
8625a7e7a0bSStefan Hajnoczi     block_job_defer_to_main_loop(&s->common, mirror_exit, data);
863893f7ebaSPaolo Bonzini }
864893f7ebaSPaolo Bonzini 
865893f7ebaSPaolo Bonzini static void mirror_set_speed(BlockJob *job, int64_t speed, Error **errp)
866893f7ebaSPaolo Bonzini {
867893f7ebaSPaolo Bonzini     MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
868893f7ebaSPaolo Bonzini 
869893f7ebaSPaolo Bonzini     if (speed < 0) {
870c6bd8c70SMarkus Armbruster         error_setg(errp, QERR_INVALID_PARAMETER, "speed");
871893f7ebaSPaolo Bonzini         return;
872893f7ebaSPaolo Bonzini     }
873893f7ebaSPaolo Bonzini     ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME);
874893f7ebaSPaolo Bonzini }
875893f7ebaSPaolo Bonzini 
876d63ffd87SPaolo Bonzini static void mirror_complete(BlockJob *job, Error **errp)
877d63ffd87SPaolo Bonzini {
878d63ffd87SPaolo Bonzini     MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
879274fcceeSMax Reitz     BlockDriverState *src, *target;
880d63ffd87SPaolo Bonzini 
881274fcceeSMax Reitz     src = blk_bs(job->blk);
882274fcceeSMax Reitz     target = blk_bs(s->target);
883274fcceeSMax Reitz 
884d63ffd87SPaolo Bonzini     if (!s->synced) {
8859df229c3SAlberto Garcia         error_setg(errp, "The active block job '%s' cannot be completed",
8869df229c3SAlberto Garcia                    job->id);
887d63ffd87SPaolo Bonzini         return;
888d63ffd87SPaolo Bonzini     }
889d63ffd87SPaolo Bonzini 
890274fcceeSMax Reitz     if (s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) {
891274fcceeSMax Reitz         int ret;
892274fcceeSMax Reitz 
893274fcceeSMax Reitz         assert(!target->backing);
894274fcceeSMax Reitz         ret = bdrv_open_backing_file(target, NULL, "backing", errp);
895274fcceeSMax Reitz         if (ret < 0) {
896274fcceeSMax Reitz             return;
897274fcceeSMax Reitz         }
898274fcceeSMax Reitz     }
899274fcceeSMax Reitz 
90015d67298SChanglong Xie     /* block all operations on to_replace bs */
90109158f00SBenoît Canet     if (s->replaces) {
9025a7e7a0bSStefan Hajnoczi         AioContext *replace_aio_context;
9035a7e7a0bSStefan Hajnoczi 
904e12f3784SWen Congyang         s->to_replace = bdrv_find_node(s->replaces);
90509158f00SBenoît Canet         if (!s->to_replace) {
906e12f3784SWen Congyang             error_setg(errp, "Node name '%s' not found", s->replaces);
90709158f00SBenoît Canet             return;
90809158f00SBenoît Canet         }
90909158f00SBenoît Canet 
9105a7e7a0bSStefan Hajnoczi         replace_aio_context = bdrv_get_aio_context(s->to_replace);
9115a7e7a0bSStefan Hajnoczi         aio_context_acquire(replace_aio_context);
9125a7e7a0bSStefan Hajnoczi 
91309158f00SBenoît Canet         error_setg(&s->replace_blocker,
91409158f00SBenoît Canet                    "block device is in use by block-job-complete");
91509158f00SBenoît Canet         bdrv_op_block_all(s->to_replace, s->replace_blocker);
91609158f00SBenoît Canet         bdrv_ref(s->to_replace);
9175a7e7a0bSStefan Hajnoczi 
9185a7e7a0bSStefan Hajnoczi         aio_context_release(replace_aio_context);
91909158f00SBenoît Canet     }
92009158f00SBenoît Canet 
921274fcceeSMax Reitz     if (s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) {
922274fcceeSMax Reitz         BlockDriverState *backing = s->is_none_mode ? src : s->base;
923274fcceeSMax Reitz         if (backing_bs(target) != backing) {
924274fcceeSMax Reitz             bdrv_set_backing_hd(target, backing);
925274fcceeSMax Reitz         }
926274fcceeSMax Reitz     }
927274fcceeSMax Reitz 
928d63ffd87SPaolo Bonzini     s->should_complete = true;
929751ebd76SFam Zheng     block_job_enter(&s->common);
930d63ffd87SPaolo Bonzini }
931d63ffd87SPaolo Bonzini 
932bae8196dSPaolo Bonzini static void mirror_pause(BlockJob *job)
933565ac01fSStefan Hajnoczi {
934565ac01fSStefan Hajnoczi     MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
935565ac01fSStefan Hajnoczi 
936bae8196dSPaolo Bonzini     mirror_wait_for_all_io(s);
937565ac01fSStefan Hajnoczi }
938565ac01fSStefan Hajnoczi 
939565ac01fSStefan Hajnoczi static void mirror_attached_aio_context(BlockJob *job, AioContext *new_context)
940565ac01fSStefan Hajnoczi {
941565ac01fSStefan Hajnoczi     MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
942565ac01fSStefan Hajnoczi 
943565ac01fSStefan Hajnoczi     blk_set_aio_context(s->target, new_context);
944565ac01fSStefan Hajnoczi }
945565ac01fSStefan Hajnoczi 
946bae8196dSPaolo Bonzini static void mirror_drain(BlockJob *job)
947bae8196dSPaolo Bonzini {
948bae8196dSPaolo Bonzini     MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
949bae8196dSPaolo Bonzini 
950bae8196dSPaolo Bonzini     /* Need to keep a reference in case blk_drain triggers execution
951bae8196dSPaolo Bonzini      * of mirror_complete...
952bae8196dSPaolo Bonzini      */
953bae8196dSPaolo Bonzini     if (s->target) {
954bae8196dSPaolo Bonzini         BlockBackend *target = s->target;
955bae8196dSPaolo Bonzini         blk_ref(target);
956bae8196dSPaolo Bonzini         blk_drain(target);
957bae8196dSPaolo Bonzini         blk_unref(target);
958bae8196dSPaolo Bonzini     }
959bae8196dSPaolo Bonzini }
960bae8196dSPaolo Bonzini 
9613fc4b10aSFam Zheng static const BlockJobDriver mirror_job_driver = {
962893f7ebaSPaolo Bonzini     .instance_size          = sizeof(MirrorBlockJob),
96379e14bf7SFam Zheng     .job_type               = BLOCK_JOB_TYPE_MIRROR,
964893f7ebaSPaolo Bonzini     .set_speed              = mirror_set_speed,
965a7815a76SJohn Snow     .start                  = mirror_run,
966d63ffd87SPaolo Bonzini     .complete               = mirror_complete,
967565ac01fSStefan Hajnoczi     .pause                  = mirror_pause,
968565ac01fSStefan Hajnoczi     .attached_aio_context   = mirror_attached_aio_context,
969bae8196dSPaolo Bonzini     .drain                  = mirror_drain,
970893f7ebaSPaolo Bonzini };
971893f7ebaSPaolo Bonzini 
97203544a6eSFam Zheng static const BlockJobDriver commit_active_job_driver = {
97303544a6eSFam Zheng     .instance_size          = sizeof(MirrorBlockJob),
97403544a6eSFam Zheng     .job_type               = BLOCK_JOB_TYPE_COMMIT,
97503544a6eSFam Zheng     .set_speed              = mirror_set_speed,
976a7815a76SJohn Snow     .start                  = mirror_run,
97703544a6eSFam Zheng     .complete               = mirror_complete,
978565ac01fSStefan Hajnoczi     .pause                  = mirror_pause,
979565ac01fSStefan Hajnoczi     .attached_aio_context   = mirror_attached_aio_context,
980bae8196dSPaolo Bonzini     .drain                  = mirror_drain,
98103544a6eSFam Zheng };
98203544a6eSFam Zheng 
98371aa9867SAlberto Garcia static void mirror_start_job(const char *job_id, BlockDriverState *bs,
98447970dfbSJohn Snow                              int creation_flags, BlockDriverState *target,
98547970dfbSJohn Snow                              const char *replaces, int64_t speed,
98647970dfbSJohn Snow                              uint32_t granularity, int64_t buf_size,
987274fcceeSMax Reitz                              BlockMirrorBackingMode backing_mode,
98803544a6eSFam Zheng                              BlockdevOnError on_source_error,
989b952b558SPaolo Bonzini                              BlockdevOnError on_target_error,
9900fc9f8eaSFam Zheng                              bool unmap,
991097310b5SMarkus Armbruster                              BlockCompletionFunc *cb,
99203544a6eSFam Zheng                              void *opaque, Error **errp,
99303544a6eSFam Zheng                              const BlockJobDriver *driver,
994b49f7eadSWen Congyang                              bool is_none_mode, BlockDriverState *base,
995b49f7eadSWen Congyang                              bool auto_complete)
996893f7ebaSPaolo Bonzini {
997893f7ebaSPaolo Bonzini     MirrorBlockJob *s;
998893f7ebaSPaolo Bonzini 
999eee13dfeSPaolo Bonzini     if (granularity == 0) {
1000341ebc2fSJohn Snow         granularity = bdrv_get_default_bitmap_granularity(target);
1001eee13dfeSPaolo Bonzini     }
1002eee13dfeSPaolo Bonzini 
1003eee13dfeSPaolo Bonzini     assert ((granularity & (granularity - 1)) == 0);
1004eee13dfeSPaolo Bonzini 
100548ac0a4dSWen Congyang     if (buf_size < 0) {
100648ac0a4dSWen Congyang         error_setg(errp, "Invalid parameter 'buf-size'");
100748ac0a4dSWen Congyang         return;
100848ac0a4dSWen Congyang     }
100948ac0a4dSWen Congyang 
101048ac0a4dSWen Congyang     if (buf_size == 0) {
101148ac0a4dSWen Congyang         buf_size = DEFAULT_MIRROR_BUF_SIZE;
101248ac0a4dSWen Congyang     }
10135bc361b8SFam Zheng 
101447970dfbSJohn Snow     s = block_job_create(job_id, driver, bs, speed, creation_flags,
101547970dfbSJohn Snow                          cb, opaque, errp);
1016893f7ebaSPaolo Bonzini     if (!s) {
1017893f7ebaSPaolo Bonzini         return;
1018893f7ebaSPaolo Bonzini     }
1019893f7ebaSPaolo Bonzini 
1020e253f4b8SKevin Wolf     s->target = blk_new();
1021e253f4b8SKevin Wolf     blk_insert_bs(s->target, target);
1022e253f4b8SKevin Wolf 
102309158f00SBenoît Canet     s->replaces = g_strdup(replaces);
1024b952b558SPaolo Bonzini     s->on_source_error = on_source_error;
1025b952b558SPaolo Bonzini     s->on_target_error = on_target_error;
102603544a6eSFam Zheng     s->is_none_mode = is_none_mode;
1027274fcceeSMax Reitz     s->backing_mode = backing_mode;
10285bc361b8SFam Zheng     s->base = base;
1029eee13dfeSPaolo Bonzini     s->granularity = granularity;
103048ac0a4dSWen Congyang     s->buf_size = ROUND_UP(buf_size, granularity);
10310fc9f8eaSFam Zheng     s->unmap = unmap;
1032b49f7eadSWen Congyang     if (auto_complete) {
1033b49f7eadSWen Congyang         s->should_complete = true;
1034b49f7eadSWen Congyang     }
1035b812f671SPaolo Bonzini 
10360db6e54aSFam Zheng     s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp);
1037b8afb520SFam Zheng     if (!s->dirty_bitmap) {
103897031164STing Wang         g_free(s->replaces);
1039e253f4b8SKevin Wolf         blk_unref(s->target);
104018930ba3SFam Zheng         block_job_unref(&s->common);
1041b8afb520SFam Zheng         return;
1042b8afb520SFam Zheng     }
104310f3cd15SAlberto Garcia 
1044cee3c6b5SAlberto Garcia     block_job_add_bdrv(&s->common, target);
1045f3ede4b0SAlberto Garcia     /* In commit_active_start() all intermediate nodes disappear, so
1046f3ede4b0SAlberto Garcia      * any jobs in them must be blocked */
1047f3ede4b0SAlberto Garcia     if (bdrv_chain_contains(bs, target)) {
1048f3ede4b0SAlberto Garcia         BlockDriverState *iter;
1049f3ede4b0SAlberto Garcia         for (iter = backing_bs(bs); iter != target; iter = backing_bs(iter)) {
1050f3ede4b0SAlberto Garcia             block_job_add_bdrv(&s->common, iter);
1051f3ede4b0SAlberto Garcia         }
1052f3ede4b0SAlberto Garcia     }
105310f3cd15SAlberto Garcia 
10545ccac6f1SJohn Snow     trace_mirror_start(bs, s, opaque);
10555ccac6f1SJohn Snow     block_job_start(&s->common);
1056893f7ebaSPaolo Bonzini }
105703544a6eSFam Zheng 
105871aa9867SAlberto Garcia void mirror_start(const char *job_id, BlockDriverState *bs,
105971aa9867SAlberto Garcia                   BlockDriverState *target, const char *replaces,
10605fba6c0eSJohn Snow                   int64_t speed, uint32_t granularity, int64_t buf_size,
1061274fcceeSMax Reitz                   MirrorSyncMode mode, BlockMirrorBackingMode backing_mode,
1062274fcceeSMax Reitz                   BlockdevOnError on_source_error,
106303544a6eSFam Zheng                   BlockdevOnError on_target_error,
10648254b6d9SJohn Snow                   bool unmap, Error **errp)
106503544a6eSFam Zheng {
106603544a6eSFam Zheng     bool is_none_mode;
106703544a6eSFam Zheng     BlockDriverState *base;
106803544a6eSFam Zheng 
10694b80ab2bSJohn Snow     if (mode == MIRROR_SYNC_MODE_INCREMENTAL) {
10704b80ab2bSJohn Snow         error_setg(errp, "Sync mode 'incremental' not supported");
1071d58d8453SJohn Snow         return;
1072d58d8453SJohn Snow     }
107303544a6eSFam Zheng     is_none_mode = mode == MIRROR_SYNC_MODE_NONE;
1074760e0063SKevin Wolf     base = mode == MIRROR_SYNC_MODE_TOP ? backing_bs(bs) : NULL;
107547970dfbSJohn Snow     mirror_start_job(job_id, bs, BLOCK_JOB_DEFAULT, target, replaces,
1076274fcceeSMax Reitz                      speed, granularity, buf_size, backing_mode,
10778254b6d9SJohn Snow                      on_source_error, on_target_error, unmap, NULL, NULL, errp,
1078b49f7eadSWen Congyang                      &mirror_job_driver, is_none_mode, base, false);
107903544a6eSFam Zheng }
108003544a6eSFam Zheng 
1081fd62c609SAlberto Garcia void commit_active_start(const char *job_id, BlockDriverState *bs,
108247970dfbSJohn Snow                          BlockDriverState *base, int creation_flags,
108347970dfbSJohn Snow                          int64_t speed, BlockdevOnError on_error,
108447970dfbSJohn Snow                          BlockCompletionFunc *cb, void *opaque, Error **errp,
1085b49f7eadSWen Congyang                          bool auto_complete)
108603544a6eSFam Zheng {
10874da83585SJeff Cody     int orig_base_flags;
1088cc67f4d1SJeff Cody     Error *local_err = NULL;
10894da83585SJeff Cody 
10904da83585SJeff Cody     orig_base_flags = bdrv_get_flags(base);
10914da83585SJeff Cody 
109220a63d2cSFam Zheng     if (bdrv_reopen(base, bs->open_flags, errp)) {
109320a63d2cSFam Zheng         return;
109420a63d2cSFam Zheng     }
10954da83585SJeff Cody 
109647970dfbSJohn Snow     mirror_start_job(job_id, bs, creation_flags, base, NULL, speed, 0, 0,
109771aa9867SAlberto Garcia                      MIRROR_LEAVE_BACKING_CHAIN,
10986f13acf9SFam Zheng                      on_error, on_error, true, cb, opaque, &local_err,
1099b49f7eadSWen Congyang                      &commit_active_job_driver, false, base, auto_complete);
11000fb6395cSMarkus Armbruster     if (local_err) {
1101cc67f4d1SJeff Cody         error_propagate(errp, local_err);
11024da83585SJeff Cody         goto error_restore_flags;
11034da83585SJeff Cody     }
11044da83585SJeff Cody 
11054da83585SJeff Cody     return;
11064da83585SJeff Cody 
11074da83585SJeff Cody error_restore_flags:
11084da83585SJeff Cody     /* ignore error and errp for bdrv_reopen, because we want to propagate
11094da83585SJeff Cody      * the original error */
11104da83585SJeff Cody     bdrv_reopen(base, orig_base_flags, NULL);
11114da83585SJeff Cody     return;
111203544a6eSFam Zheng }
1113