[Qemu-devel] [PULL 0/3] Block patches
[PULL 0/2] Block patches
1
The following changes since commit ab08440a4ee09032d1a9cb22fdcab23bc7e1c656:
1
The following changes since commit 67c1115edd98f388ca89dd38322ea3fadf034523:
2
2
3
Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20180702' into staging (2018-07-02 17:57:46 +0100)
3
Merge remote-tracking branch 'remotes/kraxel/tags/ui-20210323-pull-request' into staging (2021-03-23 23:47:30 +0000)
4
4
5
are available in the Git repository at:
5
are available in the Git repository at:
6
6
7
git://github.com/codyprime/qemu-kvm-jtc.git tags/block-pull-request
7
https://gitlab.com/stefanha/qemu.git tags/block-pull-request
8
8
9
for you to fetch changes up to 9ded4a0114968e98b41494fc035ba14f84cdf700:
9
for you to fetch changes up to 3460fd7f3959d1fa7bcc255796844aa261c805a4:
10
10
11
backup: Use copy offloading (2018-07-02 23:23:45 -0400)
11
migrate-bitmaps-postcopy-test: check that we can't remove in-flight bitmaps (2021-03-24 13:41:19 +0000)
12
12
13
----------------------------------------------------------------
13
----------------------------------------------------------------
14
Block backup patches
14
Pull request
15
16
This dirty bitmap fix solves a crash that can be triggered in the destination
17
QEMU process during live migration.
18
15
----------------------------------------------------------------
19
----------------------------------------------------------------
16
20
17
Fam Zheng (3):
21
Vladimir Sementsov-Ogievskiy (2):
18
block: Fix parameter checking in bdrv_co_copy_range_internal
22
migration/block-dirty-bitmap: make incoming disabled bitmaps busy
19
block: Honour BDRV_REQ_NO_SERIALISING in copy range
23
migrate-bitmaps-postcopy-test: check that we can't remove in-flight
20
backup: Use copy offloading
24
bitmaps
21
25
22
block/backup.c | 150 ++++++++++++++++++++++++++++++------------
26
migration/block-dirty-bitmap.c | 6 ++++++
23
block/io.c | 35 +++++-----
27
tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test | 10 ++++++++++
24
block/trace-events | 1 +
28
2 files changed, 16 insertions(+)
25
include/block/block.h | 5 +-
26
4 files changed, 132 insertions(+), 59 deletions(-)
27
29
28
--
30
--
29
2.17.1
31
2.30.2
30
32
31
diff view generated by jsdifflib
[Qemu-devel] [PULL 1/3] block: Fix parameter checking in bdrv_co_copy_range_internal
Deleted patch
1
From: Fam Zheng <famz@redhat.com>
2
1
3
src may be NULL if BDRV_REQ_ZERO_WRITE flag is set, in this case only
4
check dst and dst->bs. This bug was introduced when moving in the
5
request tracking code from bdrv_co_copy_range, in 37aec7d75eb.
6
7
This especially fixes the possible segfault when initializing src_bs
8
with a NULL src.
9
10
Signed-off-by: Fam Zheng <famz@redhat.com>
11
Message-id: 20180703023758.14422-2-famz@redhat.com
12
Reviewed-by: Jeff Cody <jcody@redhat.com>
13
Signed-off-by: Jeff Cody <jcody@redhat.com>
14
---
15
block/io.c | 29 +++++++++++++++--------------
16
1 file changed, 15 insertions(+), 14 deletions(-)
17
18
diff --git a/block/io.c b/block/io.c
19
index XXXXXXX..XXXXXXX 100644
20
--- a/block/io.c
21
+++ b/block/io.c
22
@@ -XXX,XX +XXX,XX @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src,
23
bool recurse_src)
24
{
25
BdrvTrackedRequest src_req, dst_req;
26
- BlockDriverState *src_bs = src->bs;
27
- BlockDriverState *dst_bs = dst->bs;
28
int ret;
29
30
- if (!src || !dst || !src->bs || !dst->bs) {
31
+ if (!dst || !dst->bs) {
32
return -ENOMEDIUM;
33
}
34
- ret = bdrv_check_byte_request(src->bs, src_offset, bytes);
35
- if (ret) {
36
- return ret;
37
- }
38
-
39
ret = bdrv_check_byte_request(dst->bs, dst_offset, bytes);
40
if (ret) {
41
return ret;
42
@@ -XXX,XX +XXX,XX @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src,
43
return bdrv_co_pwrite_zeroes(dst, dst_offset, bytes, flags);
44
}
45
46
+ if (!src || !src->bs) {
47
+ return -ENOMEDIUM;
48
+ }
49
+ ret = bdrv_check_byte_request(src->bs, src_offset, bytes);
50
+ if (ret) {
51
+ return ret;
52
+ }
53
+
54
if (!src->bs->drv->bdrv_co_copy_range_from
55
|| !dst->bs->drv->bdrv_co_copy_range_to
56
|| src->bs->encrypted || dst->bs->encrypted) {
57
return -ENOTSUP;
58
}
59
- bdrv_inc_in_flight(src_bs);
60
- bdrv_inc_in_flight(dst_bs);
61
- tracked_request_begin(&src_req, src_bs, src_offset,
62
+ bdrv_inc_in_flight(src->bs);
63
+ bdrv_inc_in_flight(dst->bs);
64
+ tracked_request_begin(&src_req, src->bs, src_offset,
65
bytes, BDRV_TRACKED_READ);
66
- tracked_request_begin(&dst_req, dst_bs, dst_offset,
67
+ tracked_request_begin(&dst_req, dst->bs, dst_offset,
68
bytes, BDRV_TRACKED_WRITE);
69
70
wait_serialising_requests(&src_req);
71
@@ -XXX,XX +XXX,XX @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src,
72
}
73
tracked_request_end(&src_req);
74
tracked_request_end(&dst_req);
75
- bdrv_dec_in_flight(src_bs);
76
- bdrv_dec_in_flight(dst_bs);
77
+ bdrv_dec_in_flight(src->bs);
78
+ bdrv_dec_in_flight(dst->bs);
79
return ret;
80
}
81
82
--
83
2.17.1
84
85
diff view generated by jsdifflib
[Qemu-devel] [PULL 3/3] backup: Use copy offloading
[PULL 1/2] migration/block-dirty-bitmap: make incoming disabled bitmaps busy
1
From: Fam Zheng <famz@redhat.com>
1
From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
2
2
3
The implementation is similar to the 'qemu-img convert'. In the
3
Incoming enabled bitmaps are busy, because we do
4
beginning of the job, offloaded copy is attempted. If it fails, further
4
bdrv_dirty_bitmap_create_successor() for them. But disabled bitmaps
5
I/O will go through the existing bounce buffer code path.
5
being migrated are not marked busy, and user can remove them during the
6
incoming migration. Then we may crash in cancel_incoming_locked() when
7
try to remove the bitmap that was already removed by user, like this:
6
8
7
Then, as Kevin pointed out, both this and qemu-img convert can benefit
9
#0 qemu_mutex_lock_impl (mutex=0x5593d88c50d1, file=0x559680554b20
8
from a local check if one request fails because of, for example, the
10
"../block/dirty-bitmap.c", line=64) at ../util/qemu-thread-posix.c:77
9
offset is beyond EOF, but another may well be accepted by the protocol
11
#1 bdrv_dirty_bitmaps_lock (bs=0x5593d88c0ee9)
10
layer. This will be implemented separately.
12
at ../block/dirty-bitmap.c:64
13
#2 bdrv_release_dirty_bitmap (bitmap=0x5596810e9570)
14
at ../block/dirty-bitmap.c:362
15
#3 cancel_incoming_locked (s=0x559680be8208 <dbm_state+40>)
16
at ../migration/block-dirty-bitmap.c:918
17
#4 dirty_bitmap_load (f=0x559681d02b10, opaque=0x559680be81e0
18
<dbm_state>, version_id=1) at ../migration/block-dirty-bitmap.c:1194
19
#5 vmstate_load (f=0x559681d02b10, se=0x559680fb5810)
20
at ../migration/savevm.c:908
21
#6 qemu_loadvm_section_part_end (f=0x559681d02b10,
22
mis=0x559680fb4a30) at ../migration/savevm.c:2473
23
#7 qemu_loadvm_state_main (f=0x559681d02b10, mis=0x559680fb4a30)
24
at ../migration/savevm.c:2626
25
#8 postcopy_ram_listen_thread (opaque=0x0)
26
at ../migration/savevm.c:1871
27
#9 qemu_thread_start (args=0x5596817ccd10)
28
at ../util/qemu-thread-posix.c:521
29
#10 start_thread () at /lib64/libpthread.so.0
30
#11 clone () at /lib64/libc.so.6
11
31
12
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
32
Note bs pointer taken from bitmap: it's definitely bad aligned. That's
13
Signed-off-by: Fam Zheng <famz@redhat.com>
33
because we are in use after free, bitmap is already freed.
14
Message-id: 20180703023758.14422-4-famz@redhat.com
34
15
Signed-off-by: Jeff Cody <jcody@redhat.com>
35
So, let's make disabled bitmaps (being migrated) busy during incoming
36
migration.
37
38
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
39
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
40
Message-Id: <20210322094906.5079-2-vsementsov@virtuozzo.com>
16
---
41
---
17
block/backup.c | 150 ++++++++++++++++++++++++++++++++-------------
42
migration/block-dirty-bitmap.c | 6 ++++++
18
block/trace-events | 1 +
43
1 file changed, 6 insertions(+)
19
2 files changed, 110 insertions(+), 41 deletions(-)
20
44
21
diff --git a/block/backup.c b/block/backup.c
45
diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
22
index XXXXXXX..XXXXXXX 100644
46
index XXXXXXX..XXXXXXX 100644
23
--- a/block/backup.c
47
--- a/migration/block-dirty-bitmap.c
24
+++ b/block/backup.c
48
+++ b/migration/block-dirty-bitmap.c
25
@@ -XXX,XX +XXX,XX @@ typedef struct BackupBlockJob {
49
@@ -XXX,XX +XXX,XX @@ static int dirty_bitmap_load_start(QEMUFile *f, DBMLoadState *s)
26
QLIST_HEAD(, CowRequest) inflight_reqs;
50
error_report_err(local_err);
27
51
return -EINVAL;
28
HBitmap *copy_bitmap;
52
}
29
+ bool use_copy_range;
30
+ int64_t copy_range_size;
31
} BackupBlockJob;
32
33
static const BlockJobDriver backup_job_driver;
34
@@ -XXX,XX +XXX,XX @@ static void cow_request_end(CowRequest *req)
35
qemu_co_queue_restart_all(&req->wait_queue);
36
}
37
38
+/* Copy range to target with a bounce buffer and return the bytes copied. If
39
+ * error occured, return a negative error number */
40
+static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job,
41
+ int64_t start,
42
+ int64_t end,
43
+ bool is_write_notifier,
44
+ bool *error_is_read,
45
+ void **bounce_buffer)
46
+{
47
+ int ret;
48
+ struct iovec iov;
49
+ QEMUIOVector qiov;
50
+ BlockBackend *blk = job->common.blk;
51
+ int nbytes;
52
+
53
+ hbitmap_reset(job->copy_bitmap, start / job->cluster_size, 1);
54
+ nbytes = MIN(job->cluster_size, job->len - start);
55
+ if (!*bounce_buffer) {
56
+ *bounce_buffer = blk_blockalign(blk, job->cluster_size);
57
+ }
58
+ iov.iov_base = *bounce_buffer;
59
+ iov.iov_len = nbytes;
60
+ qemu_iovec_init_external(&qiov, &iov, 1);
61
+
62
+ ret = blk_co_preadv(blk, start, qiov.size, &qiov,
63
+ is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0);
64
+ if (ret < 0) {
65
+ trace_backup_do_cow_read_fail(job, start, ret);
66
+ if (error_is_read) {
67
+ *error_is_read = true;
68
+ }
69
+ goto fail;
70
+ }
71
+
72
+ if (qemu_iovec_is_zero(&qiov)) {
73
+ ret = blk_co_pwrite_zeroes(job->target, start,
74
+ qiov.size, BDRV_REQ_MAY_UNMAP);
75
+ } else {
53
+ } else {
76
+ ret = blk_co_pwritev(job->target, start,
54
+ bdrv_dirty_bitmap_set_busy(s->bitmap, true);
77
+ qiov.size, &qiov,
55
}
78
+ job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0);
56
79
+ }
57
b = g_new(LoadBitmapState, 1);
80
+ if (ret < 0) {
58
@@ -XXX,XX +XXX,XX @@ static void cancel_incoming_locked(DBMLoadState *s)
81
+ trace_backup_do_cow_write_fail(job, start, ret);
59
assert(!s->before_vm_start_handled || !b->migrated);
82
+ if (error_is_read) {
60
if (bdrv_dirty_bitmap_has_successor(b->bitmap)) {
83
+ *error_is_read = false;
61
bdrv_reclaim_dirty_bitmap(b->bitmap, &error_abort);
84
+ }
62
+ } else {
85
+ goto fail;
63
+ bdrv_dirty_bitmap_set_busy(b->bitmap, false);
86
+ }
87
+
88
+ return nbytes;
89
+fail:
90
+ hbitmap_set(job->copy_bitmap, start / job->cluster_size, 1);
91
+ return ret;
92
+
93
+}
94
+
95
+/* Copy range to target and return the bytes copied. If error occured, return a
96
+ * negative error number. */
97
+static int coroutine_fn backup_cow_with_offload(BackupBlockJob *job,
98
+ int64_t start,
99
+ int64_t end,
100
+ bool is_write_notifier)
101
+{
102
+ int ret;
103
+ int nr_clusters;
104
+ BlockBackend *blk = job->common.blk;
105
+ int nbytes;
106
+
107
+ assert(QEMU_IS_ALIGNED(job->copy_range_size, job->cluster_size));
108
+ nbytes = MIN(job->copy_range_size, end - start);
109
+ nr_clusters = DIV_ROUND_UP(nbytes, job->cluster_size);
110
+ hbitmap_reset(job->copy_bitmap, start / job->cluster_size,
111
+ nr_clusters);
112
+ ret = blk_co_copy_range(blk, start, job->target, start, nbytes,
113
+ is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0);
114
+ if (ret < 0) {
115
+ trace_backup_do_cow_copy_range_fail(job, start, ret);
116
+ hbitmap_set(job->copy_bitmap, start / job->cluster_size,
117
+ nr_clusters);
118
+ return ret;
119
+ }
120
+
121
+ return nbytes;
122
+}
123
+
124
static int coroutine_fn backup_do_cow(BackupBlockJob *job,
125
int64_t offset, uint64_t bytes,
126
bool *error_is_read,
127
bool is_write_notifier)
128
{
129
- BlockBackend *blk = job->common.blk;
130
CowRequest cow_request;
131
- struct iovec iov;
132
- QEMUIOVector bounce_qiov;
133
- void *bounce_buffer = NULL;
134
int ret = 0;
135
int64_t start, end; /* bytes */
136
- int n; /* bytes */
137
+ void *bounce_buffer = NULL;
138
139
qemu_co_rwlock_rdlock(&job->flush_rwlock);
140
141
@@ -XXX,XX +XXX,XX @@ static int coroutine_fn backup_do_cow(BackupBlockJob *job,
142
wait_for_overlapping_requests(job, start, end);
143
cow_request_begin(&cow_request, job, start, end);
144
145
- for (; start < end; start += job->cluster_size) {
146
+ while (start < end) {
147
if (!hbitmap_get(job->copy_bitmap, start / job->cluster_size)) {
148
trace_backup_do_cow_skip(job, start);
149
+ start += job->cluster_size;
150
continue; /* already copied */
151
}
64
}
152
- hbitmap_reset(job->copy_bitmap, start / job->cluster_size, 1);
65
bdrv_release_dirty_bitmap(b->bitmap);
153
154
trace_backup_do_cow_process(job, start);
155
156
- n = MIN(job->cluster_size, job->len - start);
157
-
158
- if (!bounce_buffer) {
159
- bounce_buffer = blk_blockalign(blk, job->cluster_size);
160
- }
161
- iov.iov_base = bounce_buffer;
162
- iov.iov_len = n;
163
- qemu_iovec_init_external(&bounce_qiov, &iov, 1);
164
-
165
- ret = blk_co_preadv(blk, start, bounce_qiov.size, &bounce_qiov,
166
- is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0);
167
- if (ret < 0) {
168
- trace_backup_do_cow_read_fail(job, start, ret);
169
- if (error_is_read) {
170
- *error_is_read = true;
171
+ if (job->use_copy_range) {
172
+ ret = backup_cow_with_offload(job, start, end, is_write_notifier);
173
+ if (ret < 0) {
174
+ job->use_copy_range = false;
175
}
176
- hbitmap_set(job->copy_bitmap, start / job->cluster_size, 1);
177
- goto out;
178
}
179
-
180
- if (buffer_is_zero(iov.iov_base, iov.iov_len)) {
181
- ret = blk_co_pwrite_zeroes(job->target, start,
182
- bounce_qiov.size, BDRV_REQ_MAY_UNMAP);
183
- } else {
184
- ret = blk_co_pwritev(job->target, start,
185
- bounce_qiov.size, &bounce_qiov,
186
- job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0);
187
+ if (!job->use_copy_range) {
188
+ ret = backup_cow_with_bounce_buffer(job, start, end, is_write_notifier,
189
+ error_is_read, &bounce_buffer);
190
}
191
if (ret < 0) {
192
- trace_backup_do_cow_write_fail(job, start, ret);
193
- if (error_is_read) {
194
- *error_is_read = false;
195
- }
196
- hbitmap_set(job->copy_bitmap, start / job->cluster_size, 1);
197
- goto out;
198
+ break;
199
}
200
201
/* Publish progress, guest I/O counts as progress too. Note that the
202
* offset field is an opaque progress value, it is not a disk offset.
203
*/
204
- job->bytes_read += n;
205
- job_progress_update(&job->common.job, n);
206
+ start += ret;
207
+ job->bytes_read += ret;
208
+ job_progress_update(&job->common.job, ret);
209
+ ret = 0;
210
}
66
}
211
67
@@ -XXX,XX +XXX,XX @@ static void dirty_bitmap_load_complete(QEMUFile *f, DBMLoadState *s)
212
-out:
68
213
if (bounce_buffer) {
69
if (bdrv_dirty_bitmap_has_successor(s->bitmap)) {
214
qemu_vfree(bounce_buffer);
70
bdrv_reclaim_dirty_bitmap(s->bitmap, &error_abort);
71
+ } else {
72
+ bdrv_dirty_bitmap_set_busy(s->bitmap, false);
215
}
73
}
216
@@ -XXX,XX +XXX,XX @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
74
217
} else {
75
for (item = s->bitmaps; item; item = g_slist_next(item)) {
218
job->cluster_size = MAX(BACKUP_CLUSTER_SIZE_DEFAULT, bdi.cluster_size);
219
}
220
+ job->use_copy_range = true;
221
+ job->copy_range_size = MIN_NON_ZERO(blk_get_max_transfer(job->common.blk),
222
+ blk_get_max_transfer(job->target));
223
+ job->copy_range_size = MAX(job->cluster_size,
224
+ QEMU_ALIGN_UP(job->copy_range_size,
225
+ job->cluster_size));
226
227
/* Required permissions are already taken with target's blk_new() */
228
block_job_add_bdrv(&job->common, "target", target, 0, BLK_PERM_ALL,
229
diff --git a/block/trace-events b/block/trace-events
230
index XXXXXXX..XXXXXXX 100644
231
--- a/block/trace-events
232
+++ b/block/trace-events
233
@@ -XXX,XX +XXX,XX @@ backup_do_cow_skip(void *job, int64_t start) "job %p start %"PRId64
234
backup_do_cow_process(void *job, int64_t start) "job %p start %"PRId64
235
backup_do_cow_read_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d"
236
backup_do_cow_write_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d"
237
+backup_do_cow_copy_range_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d"
238
239
# blockdev.c
240
qmp_block_job_cancel(void *job) "job %p"
241
--
76
--
242
2.17.1
77
2.30.2
243
78
244
diff view generated by jsdifflib
[Qemu-devel] [PULL 2/3] block: Honour BDRV_REQ_NO_SERIALISING in copy range
[PULL 2/2] migrate-bitmaps-postcopy-test: check that we can't remove in-flight bitmaps
1
From: Fam Zheng <famz@redhat.com>
1
From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
2
2
3
This semantics is needed by drive-backup so implement it before using
3
Check that we can't remove bitmaps being migrated on destination vm.
4
this API there.
4
The new check proves that previous commit helps.
5
5
6
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
6
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
7
Signed-off-by: Fam Zheng <famz@redhat.com>
7
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
8
Message-id: 20180703023758.14422-3-famz@redhat.com
8
Message-Id: <20210322094906.5079-3-vsementsov@virtuozzo.com>
9
Signed-off-by: Jeff Cody <jcody@redhat.com>
10
---
9
---
11
block/io.c | 6 ++++--
10
tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test | 10 ++++++++++
12
include/block/block.h | 5 +++--
11
1 file changed, 10 insertions(+)
13
2 files changed, 7 insertions(+), 4 deletions(-)
14
12
15
diff --git a/block/io.c b/block/io.c
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diff --git a/tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test b/tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test
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index XXXXXXX..XXXXXXX 100644
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index XXXXXXX..XXXXXXX 100755
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--- a/block/io.c
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--- a/tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test
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+++ b/block/io.c
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+++ b/tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test
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@@ -XXX,XX +XXX,XX @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src,
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@@ -XXX,XX +XXX,XX @@ class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase):
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tracked_request_begin(&dst_req, dst->bs, dst_offset,
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self.start_postcopy()
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bytes, BDRV_TRACKED_WRITE);
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22
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self.vm_b_events += self.vm_b.get_qmp_events()
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- wait_serialising_requests(&src_req);
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+
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- wait_serialising_requests(&dst_req);
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+ # While being here, let's check that we can't remove in-flight bitmaps.
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+ if (!(flags & BDRV_REQ_NO_SERIALISING)) {
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+ for vm in (self.vm_a, self.vm_b):
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+ wait_serialising_requests(&src_req);
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+ for i in range(0, nb_bitmaps):
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+ wait_serialising_requests(&dst_req);
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+ result = vm.qmp('block-dirty-bitmap-remove', node='drive0',
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+ }
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+ name=f'bitmap{i}')
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if (recurse_src) {
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+ self.assert_qmp(result, 'error/desc',
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ret = src->bs->drv->bdrv_co_copy_range_from(src->bs,
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+ f"Bitmap 'bitmap{i}' is currently in use by "
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src, src_offset,
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+ "another operation and cannot be used")
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diff --git a/include/block/block.h b/include/block/block.h
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+
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index XXXXXXX..XXXXXXX 100644
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self.vm_b.shutdown()
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--- a/include/block/block.h
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# recreate vm_b, so there is no incoming option, which prevents
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+++ b/include/block/block.h
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# loading bitmaps from disk
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@@ -XXX,XX +XXX,XX @@ void bdrv_unregister_buf(BlockDriverState *bs, void *host);
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* @dst: Destination child to copy data to
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* @dst_offset: offset in @dst image to write data
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* @bytes: number of bytes to copy
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- * @flags: request flags. Must be one of:
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- * 0 - actually read data from src;
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+ * @flags: request flags. Supported flags:
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* BDRV_REQ_ZERO_WRITE - treat the @src range as zero data and do zero
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* write on @dst as if bdrv_co_pwrite_zeroes is
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* called. Used to simplify caller code, or
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* during BlockDriver.bdrv_co_copy_range_from()
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* recursion.
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+ * BDRV_REQ_NO_SERIALISING - do not serialize with other overlapping
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+ * requests currently in flight.
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*
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* Returns: 0 if succeeded; negative error code if failed.
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**/
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--
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--
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2.17.1
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2.30.2
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36
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diff view generated by jsdifflib

Patchew 2.1-devel-b67e4c2

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