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block/backup: introduce BlockCopyState 

Split copying code part from backup to "block-copy", including separate
state structure and function renaming. This is needed to share it with
backup-top filter driver in further commits.

Notes:

1. As BlockCopyState keeps own BlockBackend objects, remaining
job->common.blk users only use it to get bs by blk_bs() call, so clear
job->commen.blk permissions set in block_job_create and add
job->source_bs to be used instead of blk_bs(job->common.blk), to keep
it more clear which bs we use when introduce backup-top filter in
further commit.

2. Rename s/initializing_bitmap/skip_unallocated/ to sound a bit better
as interface to BlockCopyState

3. Split is not very clean: there left some duplicated fields, backup
code uses some BlockCopyState fields directly, let's postpone it for
further improvements and keep this comment simpler for review.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190920142056.12778-6-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2019-09-20 17:20:46 +03:00 committed by Max Reitz
parent 372c67ea61
commit 2c8074c453
2 changed files with 239 additions and 143 deletions
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370
block/backup.c
View File

@ -35,12 +35,52 @@ typedef struct CowRequest {
CoQueue wait_queue; /* coroutines blocked on this request */
} CowRequest;
typedef void (*ProgressBytesCallbackFunc)(int64_t bytes, void *opaque);
typedef void (*ProgressResetCallbackFunc)(void *opaque);
typedef struct BlockCopyState {
BlockBackend *source;
BlockBackend *target;
BdrvDirtyBitmap *copy_bitmap;
int64_t cluster_size;
bool use_copy_range;
int64_t copy_range_size;
uint64_t len;
BdrvRequestFlags write_flags;
/*
* skip_unallocated:
*
* Used by sync=top jobs, which first scan the source node for unallocated
* areas and clear them in the copy_bitmap. During this process, the bitmap
* is thus not fully initialized: It may still have bits set for areas that
* are unallocated and should actually not be copied.
*
* This is indicated by skip_unallocated.
*
* In this case, block_copy() will query the source’s allocation status,
* skip unallocated regions, clear them in the copy_bitmap, and invoke
* block_copy_reset_unallocated() every time it does.
*/
bool skip_unallocated;
/* progress_bytes_callback: called when some copying progress is done. */
ProgressBytesCallbackFunc progress_bytes_callback;
/*
* progress_reset_callback: called when some bytes reset from copy_bitmap
* (see @skip_unallocated above). The callee is assumed to recalculate how
* many bytes remain based on the dirty bit count of copy_bitmap.
*/
ProgressResetCallbackFunc progress_reset_callback;
void *progress_opaque;
} BlockCopyState;
typedef struct BackupBlockJob {
BlockJob common;
BlockBackend *target;
BlockDriverState *source_bs;
BdrvDirtyBitmap *sync_bitmap;
BdrvDirtyBitmap *copy_bitmap;
MirrorSyncMode sync_mode;
BitmapSyncMode bitmap_mode;
@ -53,11 +93,7 @@ typedef struct BackupBlockJob {
NotifierWithReturn before_write;
QLIST_HEAD(, CowRequest) inflight_reqs;
bool use_copy_range;
int64_t copy_range_size;
BdrvRequestFlags write_flags;
bool initializing_bitmap;
BlockCopyState *bcs;
} BackupBlockJob;
static const BlockJobDriver backup_job_driver;
@ -99,9 +135,97 @@ static void cow_request_end(CowRequest *req)
qemu_co_queue_restart_all(&req->wait_queue);
}
static void block_copy_state_free(BlockCopyState *s)
{
if (!s) {
return;
}
bdrv_release_dirty_bitmap(blk_bs(s->source), s->copy_bitmap);
blk_unref(s->source);
blk_unref(s->target);
g_free(s);
}
static BlockCopyState *block_copy_state_new(
BlockDriverState *source, BlockDriverState *target,
int64_t cluster_size, BdrvRequestFlags write_flags,
ProgressBytesCallbackFunc progress_bytes_callback,
ProgressResetCallbackFunc progress_reset_callback,
void *progress_opaque, Error **errp)
{
BlockCopyState *s;
int ret;
uint64_t no_resize = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE |
BLK_PERM_WRITE_UNCHANGED | BLK_PERM_GRAPH_MOD;
BdrvDirtyBitmap *copy_bitmap;
copy_bitmap = bdrv_create_dirty_bitmap(source, cluster_size, NULL, errp);
if (!copy_bitmap) {
return NULL;
}
bdrv_disable_dirty_bitmap(copy_bitmap);
s = g_new(BlockCopyState, 1);
*s = (BlockCopyState) {
.source = blk_new(bdrv_get_aio_context(source),
BLK_PERM_CONSISTENT_READ, no_resize),
.target = blk_new(bdrv_get_aio_context(target),
BLK_PERM_WRITE, no_resize),
.copy_bitmap = copy_bitmap,
.cluster_size = cluster_size,
.len = bdrv_dirty_bitmap_size(copy_bitmap),
.write_flags = write_flags,
.progress_bytes_callback = progress_bytes_callback,
.progress_reset_callback = progress_reset_callback,
.progress_opaque = progress_opaque,
};
s->copy_range_size = QEMU_ALIGN_DOWN(MIN(blk_get_max_transfer(s->source),
blk_get_max_transfer(s->target)),
s->cluster_size);
/*
* Set use_copy_range, consider the following:
* 1. Compression is not supported for copy_range.
* 2. copy_range does not respect max_transfer (it's a TODO), so we factor
* that in here. If max_transfer is smaller than the job->cluster_size,
* we do not use copy_range (in that case it's zero after aligning down
* above).
*/
s->use_copy_range =
!(write_flags & BDRV_REQ_WRITE_COMPRESSED) && s->copy_range_size > 0;
/*
* We just allow aio context change on our block backends. block_copy() user
* (now it's only backup) is responsible for source and target being in same
* aio context.
*/
blk_set_disable_request_queuing(s->source, true);
blk_set_allow_aio_context_change(s->source, true);
blk_set_disable_request_queuing(s->target, true);
blk_set_allow_aio_context_change(s->target, true);
ret = blk_insert_bs(s->source, source, errp);
if (ret < 0) {
goto fail;
}
ret = blk_insert_bs(s->target, target, errp);
if (ret < 0) {
goto fail;
}
return s;
fail:
block_copy_state_free(s);
return NULL;
}
/* Copy range to target with a bounce buffer and return the bytes copied. If
* error occurred, return a negative error number */
static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job,
static int coroutine_fn block_copy_with_bounce_buffer(BlockCopyState *s,
int64_t start,
int64_t end,
bool is_write_notifier,
@ -109,30 +233,29 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job,
void **bounce_buffer)
{
int ret;
BlockBackend *blk = job->common.blk;
int nbytes;
int read_flags = is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0;
assert(QEMU_IS_ALIGNED(start, job->cluster_size));
bdrv_reset_dirty_bitmap(job->copy_bitmap, start, job->cluster_size);
nbytes = MIN(job->cluster_size, job->len - start);
assert(QEMU_IS_ALIGNED(start, s->cluster_size));
bdrv_reset_dirty_bitmap(s->copy_bitmap, start, s->cluster_size);
nbytes = MIN(s->cluster_size, s->len - start);
if (!*bounce_buffer) {
*bounce_buffer = blk_blockalign(blk, job->cluster_size);
*bounce_buffer = blk_blockalign(s->source, s->cluster_size);
}
ret = blk_co_pread(blk, start, nbytes, *bounce_buffer, read_flags);
ret = blk_co_pread(s->source, start, nbytes, *bounce_buffer, read_flags);
if (ret < 0) {
trace_backup_do_cow_read_fail(job, start, ret);
trace_block_copy_with_bounce_buffer_read_fail(s, start, ret);
if (error_is_read) {
*error_is_read = true;
}
goto fail;
}
ret = blk_co_pwrite(job->target, start, nbytes, *bounce_buffer,
job->write_flags);
ret = blk_co_pwrite(s->target, start, nbytes, *bounce_buffer,
s->write_flags);
if (ret < 0) {
trace_backup_do_cow_write_fail(job, start, ret);
trace_block_copy_with_bounce_buffer_write_fail(s, start, ret);
if (error_is_read) {
*error_is_read = false;
}
@ -141,36 +264,35 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job,
return nbytes;
fail:
bdrv_set_dirty_bitmap(job->copy_bitmap, start, job->cluster_size);
bdrv_set_dirty_bitmap(s->copy_bitmap, start, s->cluster_size);
return ret;
}
/* Copy range to target and return the bytes copied. If error occurred, return a
* negative error number. */
static int coroutine_fn backup_cow_with_offload(BackupBlockJob *job,
static int coroutine_fn block_copy_with_offload(BlockCopyState *s,
int64_t start,
int64_t end,
bool is_write_notifier)
{
int ret;
int nr_clusters;
BlockBackend *blk = job->common.blk;
int nbytes;
int read_flags = is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0;
assert(QEMU_IS_ALIGNED(job->copy_range_size, job->cluster_size));
assert(QEMU_IS_ALIGNED(start, job->cluster_size));
nbytes = MIN(job->copy_range_size, MIN(end, job->len) - start);
nr_clusters = DIV_ROUND_UP(nbytes, job->cluster_size);
bdrv_reset_dirty_bitmap(job->copy_bitmap, start,
job->cluster_size * nr_clusters);
ret = blk_co_copy_range(blk, start, job->target, start, nbytes,
read_flags, job->write_flags);
assert(QEMU_IS_ALIGNED(s->copy_range_size, s->cluster_size));
assert(QEMU_IS_ALIGNED(start, s->cluster_size));
nbytes = MIN(s->copy_range_size, MIN(end, s->len) - start);
nr_clusters = DIV_ROUND_UP(nbytes, s->cluster_size);
bdrv_reset_dirty_bitmap(s->copy_bitmap, start,
s->cluster_size * nr_clusters);
ret = blk_co_copy_range(s->source, start, s->target, start, nbytes,
read_flags, s->write_flags);
if (ret < 0) {
trace_backup_do_cow_copy_range_fail(job, start, ret);
bdrv_set_dirty_bitmap(job->copy_bitmap, start,
job->cluster_size * nr_clusters);
trace_block_copy_with_offload_fail(s, start, ret);
bdrv_set_dirty_bitmap(s->copy_bitmap, start,
s->cluster_size * nr_clusters);
return ret;
}
@ -181,10 +303,10 @@ static int coroutine_fn backup_cow_with_offload(BackupBlockJob *job,
* Check if the cluster starting at offset is allocated or not.
* return via pnum the number of contiguous clusters sharing this allocation.
*/
static int backup_is_cluster_allocated(BackupBlockJob *s, int64_t offset,
int64_t *pnum)
static int block_copy_is_cluster_allocated(BlockCopyState *s, int64_t offset,
int64_t *pnum)
{
BlockDriverState *bs = blk_bs(s->common.blk);
BlockDriverState *bs = blk_bs(s->source);
int64_t count, total_count = 0;
int64_t bytes = s->len - offset;
int ret;
@ -225,13 +347,13 @@ static int backup_is_cluster_allocated(BackupBlockJob *s, int64_t offset,
* @return 0 when the cluster at @offset was unallocated,
* 1 otherwise, and -ret on error.
*/
static int64_t backup_bitmap_reset_unallocated(BackupBlockJob *s,
int64_t offset, int64_t *count)
static int64_t block_copy_reset_unallocated(BlockCopyState *s,
int64_t offset, int64_t *count)
{
int ret;
int64_t clusters, bytes, estimate;
int64_t clusters, bytes;
ret = backup_is_cluster_allocated(s, offset, &clusters);
ret = block_copy_is_cluster_allocated(s, offset, &clusters);
if (ret < 0) {
return ret;
}
@ -240,46 +362,51 @@ static int64_t backup_bitmap_reset_unallocated(BackupBlockJob *s,
if (!ret) {
bdrv_reset_dirty_bitmap(s->copy_bitmap, offset, bytes);
estimate = bdrv_get_dirty_count(s->copy_bitmap);
job_progress_set_remaining(&s->common.job, estimate);
s->progress_reset_callback(s->progress_opaque);
}
*count = bytes;
return ret;
}
static int coroutine_fn backup_do_copy(BackupBlockJob *job,
int64_t start, uint64_t bytes,
bool *error_is_read,
bool is_write_notifier)
static int coroutine_fn block_copy(BlockCopyState *s,
int64_t start, uint64_t bytes,
bool *error_is_read,
bool is_write_notifier)
{
int ret = 0;
int64_t end = bytes + start; /* bytes */
void *bounce_buffer = NULL;
int64_t status_bytes;
assert(QEMU_IS_ALIGNED(start, job->cluster_size));
assert(QEMU_IS_ALIGNED(end, job->cluster_size));
/*
* block_copy() user is responsible for keeping source and target in same
* aio context
*/
assert(blk_get_aio_context(s->source) == blk_get_aio_context(s->target));
assert(QEMU_IS_ALIGNED(start, s->cluster_size));
assert(QEMU_IS_ALIGNED(end, s->cluster_size));
while (start < end) {
int64_t dirty_end;
if (!bdrv_dirty_bitmap_get(job->copy_bitmap, start)) {
trace_backup_do_cow_skip(job, start);
start += job->cluster_size;
if (!bdrv_dirty_bitmap_get(s->copy_bitmap, start)) {
trace_block_copy_skip(s, start);
start += s->cluster_size;
continue; /* already copied */
}
dirty_end = bdrv_dirty_bitmap_next_zero(job->copy_bitmap, start,
dirty_end = bdrv_dirty_bitmap_next_zero(s->copy_bitmap, start,
(end - start));
if (dirty_end < 0) {
dirty_end = end;
}
if (job->initializing_bitmap) {
ret = backup_bitmap_reset_unallocated(job, start, &status_bytes);
if (s->skip_unallocated) {
ret = block_copy_reset_unallocated(s, start, &status_bytes);
if (ret == 0) {
trace_backup_do_cow_skip_range(job, start, status_bytes);
trace_block_copy_skip_range(s, start, status_bytes);
start += status_bytes;
continue;
}
@ -287,17 +414,17 @@ static int coroutine_fn backup_do_copy(BackupBlockJob *job,
dirty_end = MIN(dirty_end, start + status_bytes);
}
trace_backup_do_cow_process(job, start);
trace_block_copy_process(s, start);
if (job->use_copy_range) {
ret = backup_cow_with_offload(job, start, dirty_end,
if (s->use_copy_range) {
ret = block_copy_with_offload(s, start, dirty_end,
is_write_notifier);
if (ret < 0) {
job->use_copy_range = false;
s->use_copy_range = false;
}
}
if (!job->use_copy_range) {
ret = backup_cow_with_bounce_buffer(job, start, dirty_end,
if (!s->use_copy_range) {
ret = block_copy_with_bounce_buffer(s, start, dirty_end,
is_write_notifier,
error_is_read, &bounce_buffer);
}
@ -305,12 +432,8 @@ static int coroutine_fn backup_do_copy(BackupBlockJob *job,
break;
}
/* Publish progress, guest I/O counts as progress too. Note that the
* offset field is an opaque progress value, it is not a disk offset.
*/
start += ret;
job->bytes_read += ret;
job_progress_update(&job->common.job, ret);
s->progress_bytes_callback(ret, s->progress_opaque);
ret = 0;
}
@ -321,6 +444,22 @@ static int coroutine_fn backup_do_copy(BackupBlockJob *job,
return ret;
}
static void backup_progress_bytes_callback(int64_t bytes, void *opaque)
{
BackupBlockJob *s = opaque;
s->bytes_read += bytes;
job_progress_update(&s->common.job, bytes);
}
static void backup_progress_reset_callback(void *opaque)
{
BackupBlockJob *s = opaque;
uint64_t estimate = bdrv_get_dirty_count(s->bcs->copy_bitmap);
job_progress_set_remaining(&s->common.job, estimate);
}
static int coroutine_fn backup_do_cow(BackupBlockJob *job,
int64_t offset, uint64_t bytes,
bool *error_is_read,
@ -340,8 +479,8 @@ static int coroutine_fn backup_do_cow(BackupBlockJob *job,
wait_for_overlapping_requests(job, start, end);
cow_request_begin(&cow_request, job, start, end);
ret = backup_do_copy(job, start, end - start, error_is_read,
is_write_notifier);
ret = block_copy(job->bcs, start, end - start, error_is_read,
is_write_notifier);
cow_request_end(&cow_request);
@ -359,7 +498,7 @@ static int coroutine_fn backup_before_write_notify(
BackupBlockJob *job = container_of(notifier, BackupBlockJob, before_write);
BdrvTrackedRequest *req = opaque;
assert(req->bs == blk_bs(job->common.blk));
assert(req->bs == job->source_bs);
assert(QEMU_IS_ALIGNED(req->offset, BDRV_SECTOR_SIZE));
assert(QEMU_IS_ALIGNED(req->bytes, BDRV_SECTOR_SIZE));
@ -369,7 +508,6 @@ static int coroutine_fn backup_before_write_notify(
static void backup_cleanup_sync_bitmap(BackupBlockJob *job, int ret)
{
BdrvDirtyBitmap *bm;
BlockDriverState *bs = blk_bs(job->common.blk);
bool sync = (((ret == 0) || (job->bitmap_mode == BITMAP_SYNC_MODE_ALWAYS)) \
&& (job->bitmap_mode != BITMAP_SYNC_MODE_NEVER));
@ -378,20 +516,20 @@ static void backup_cleanup_sync_bitmap(BackupBlockJob *job, int ret)
* We succeeded, or we always intended to sync the bitmap.
* Delete this bitmap and install the child.
*/
bm = bdrv_dirty_bitmap_abdicate(bs, job->sync_bitmap, NULL);
bm = bdrv_dirty_bitmap_abdicate(job->source_bs, job->sync_bitmap, NULL);
} else {
/*
* We failed, or we never intended to sync the bitmap anyway.
* Merge the successor back into the parent, keeping all data.
*/
bm = bdrv_reclaim_dirty_bitmap(bs, job->sync_bitmap, NULL);
bm = bdrv_reclaim_dirty_bitmap(job->source_bs, job->sync_bitmap, NULL);
}
assert(bm);
if (ret < 0 && job->bitmap_mode == BITMAP_SYNC_MODE_ALWAYS) {
/* If we failed and synced, merge in the bits we didn't copy: */
bdrv_dirty_bitmap_merge_internal(bm, job->copy_bitmap,
bdrv_dirty_bitmap_merge_internal(bm, job->bcs->copy_bitmap,
NULL, true);
}
}
@ -415,16 +553,8 @@ static void backup_abort(Job *job)
static void backup_clean(Job *job)
{
BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
BlockDriverState *bs = blk_bs(s->common.blk);
if (s->copy_bitmap) {
bdrv_release_dirty_bitmap(bs, s->copy_bitmap);
s->copy_bitmap = NULL;
}
assert(s->target);
blk_unref(s->target);
s->target = NULL;
block_copy_state_free(s->bcs);
}
void backup_do_checkpoint(BlockJob *job, Error **errp)
@ -439,7 +569,7 @@ void backup_do_checkpoint(BlockJob *job, Error **errp)
return;
}
bdrv_set_dirty_bitmap(backup_job->copy_bitmap, 0, backup_job->len);
bdrv_set_dirty_bitmap(backup_job->bcs->copy_bitmap, 0, backup_job->len);
}
static BlockErrorAction backup_error_action(BackupBlockJob *job,
@ -482,7 +612,7 @@ static int coroutine_fn backup_loop(BackupBlockJob *job)
BdrvDirtyBitmapIter *bdbi;
int ret = 0;
bdbi = bdrv_dirty_iter_new(job->copy_bitmap);
bdbi = bdrv_dirty_iter_new(job->bcs->copy_bitmap);
while ((offset = bdrv_dirty_iter_next(bdbi)) != -1) {
do {
if (yield_and_check(job)) {
@ -509,7 +639,7 @@ static void backup_init_copy_bitmap(BackupBlockJob *job)
uint64_t estimate;
if (job->sync_mode == MIRROR_SYNC_MODE_BITMAP) {
ret = bdrv_dirty_bitmap_merge_internal(job->copy_bitmap,
ret = bdrv_dirty_bitmap_merge_internal(job->bcs->copy_bitmap,
job->sync_bitmap,
NULL, true);
assert(ret);
@ -519,19 +649,18 @@ static void backup_init_copy_bitmap(BackupBlockJob *job)
* We can't hog the coroutine to initialize this thoroughly.
* Set a flag and resume work when we are able to yield safely.
*/
job->initializing_bitmap = true;
job->bcs->skip_unallocated = true;
}
bdrv_set_dirty_bitmap(job->copy_bitmap, 0, job->len);
bdrv_set_dirty_bitmap(job->bcs->copy_bitmap, 0, job->len);
}
estimate = bdrv_get_dirty_count(job->copy_bitmap);
estimate = bdrv_get_dirty_count(job->bcs->copy_bitmap);
job_progress_set_remaining(&job->common.job, estimate);
}
static int coroutine_fn backup_run(Job *job, Error **errp)
{
BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
BlockDriverState *bs = blk_bs(s->common.blk);
int ret = 0;
QLIST_INIT(&s->inflight_reqs);
@ -540,7 +669,7 @@ static int coroutine_fn backup_run(Job *job, Error **errp)
backup_init_copy_bitmap(s);
s->before_write.notify = backup_before_write_notify;
bdrv_add_before_write_notifier(bs, &s->before_write);
bdrv_add_before_write_notifier(s->source_bs, &s->before_write);
if (s->sync_mode == MIRROR_SYNC_MODE_TOP) {
int64_t offset = 0;
@ -552,14 +681,14 @@ static int coroutine_fn backup_run(Job *job, Error **errp)
goto out;
}
ret = backup_bitmap_reset_unallocated(s, offset, &count);
ret = block_copy_reset_unallocated(s->bcs, offset, &count);
if (ret < 0) {
goto out;
}
offset += count;
}
s->initializing_bitmap = false;
s->bcs->skip_unallocated = false;
}
if (s->sync_mode == MIRROR_SYNC_MODE_NONE) {
@ -646,9 +775,8 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
{
int64_t len;
BackupBlockJob *job = NULL;
int ret;
int64_t cluster_size;
BdrvDirtyBitmap *copy_bitmap = NULL;
BdrvRequestFlags write_flags;
assert(bs);
assert(target);
@ -713,33 +841,14 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
goto error;
}
copy_bitmap = bdrv_create_dirty_bitmap(bs, cluster_size, NULL, errp);
if (!copy_bitmap) {
goto error;
}
bdrv_disable_dirty_bitmap(copy_bitmap);
/* job->len is fixed, so we can't allow resize */
job = block_job_create(job_id, &backup_job_driver, txn, bs,
BLK_PERM_CONSISTENT_READ,
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE |
BLK_PERM_WRITE_UNCHANGED | BLK_PERM_GRAPH_MOD,
job = block_job_create(job_id, &backup_job_driver, txn, bs, 0, BLK_PERM_ALL,
speed, creation_flags, cb, opaque, errp);
if (!job) {
goto error;
}
/* The target must match the source in size, so no resize here either */
job->target = blk_new(job->common.job.aio_context,
BLK_PERM_WRITE,
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE |
BLK_PERM_WRITE_UNCHANGED | BLK_PERM_GRAPH_MOD);
ret = blk_insert_bs(job->target, target, errp);
if (ret < 0) {
goto error;
}
blk_set_disable_request_queuing(job->target, true);
job->source_bs = bs;
job->on_source_error = on_source_error;
job->on_target_error = on_target_error;
job->sync_mode = sync_mode;
@ -760,28 +869,19 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
* For more information see commit f8d59dfb40bb and test
* tests/qemu-iotests/222
*/
job->write_flags =
(bdrv_chain_contains(target, bs) ? BDRV_REQ_SERIALISING : 0) |
(compress ? BDRV_REQ_WRITE_COMPRESSED : 0);
write_flags = (bdrv_chain_contains(target, bs) ? BDRV_REQ_SERIALISING : 0) |
(compress ? BDRV_REQ_WRITE_COMPRESSED : 0),
job->bcs = block_copy_state_new(bs, target, cluster_size, write_flags,
backup_progress_bytes_callback,
backup_progress_reset_callback, job, errp);
if (!job->bcs) {
goto error;
}
job->cluster_size = cluster_size;
job->copy_bitmap = copy_bitmap;
copy_bitmap = NULL;
job->copy_range_size = MIN_NON_ZERO(blk_get_max_transfer(job->common.blk),
blk_get_max_transfer(job->target));
job->copy_range_size = QEMU_ALIGN_DOWN(job->copy_range_size,
job->cluster_size);
/*
* Set use_copy_range, consider the following:
* 1. Compression is not supported for copy_range.
* 2. copy_range does not respect max_transfer (it's a TODO), so we factor
* that in here. If max_transfer is smaller than the job->cluster_size,
* we do not use copy_range (in that case it's zero after aligning down
* above).
*/
job->use_copy_range = !compress && job->copy_range_size > 0;
/* Required permissions are already taken with target's blk_new() */
/* Required permissions are already taken by block-copy-state target */
block_job_add_bdrv(&job->common, "target", target, 0, BLK_PERM_ALL,
&error_abort);
job->len = len;
@ -789,10 +889,6 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
return &job->common;
error:
if (copy_bitmap) {
assert(!job || !job->copy_bitmap);
bdrv_release_dirty_bitmap(bs, copy_bitmap);
}
if (sync_bitmap) {
bdrv_reclaim_dirty_bitmap(bs, sync_bitmap, NULL);
}

12
block/trace-events
View File

@ -40,12 +40,12 @@ mirror_yield_in_flight(void *s, int64_t offset, int in_flight) "s %p offset %" P
# backup.c
backup_do_cow_enter(void *job, int64_t start, int64_t offset, uint64_t bytes) "job %p start %" PRId64 " offset %" PRId64 " bytes %" PRIu64
backup_do_cow_return(void *job, int64_t offset, uint64_t bytes, int ret) "job %p offset %" PRId64 " bytes %" PRIu64 " ret %d"
backup_do_cow_skip(void *job, int64_t start) "job %p start %"PRId64
backup_do_cow_skip_range(void *job, int64_t start, uint64_t bytes) "job %p start %"PRId64" bytes %"PRId64
backup_do_cow_process(void *job, int64_t start) "job %p start %"PRId64
backup_do_cow_read_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d"
backup_do_cow_write_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d"
backup_do_cow_copy_range_fail(void *job, int64_t start, int ret) "job %p start %"PRId64" ret %d"
block_copy_skip(void *bcs, int64_t start) "bcs %p start %"PRId64
block_copy_skip_range(void *bcs, int64_t start, uint64_t bytes) "bcs %p start %"PRId64" bytes %"PRId64
block_copy_process(void *bcs, int64_t start) "bcs %p start %"PRId64
block_copy_with_bounce_buffer_read_fail(void *bcs, int64_t start, int ret) "bcs %p start %"PRId64" ret %d"
block_copy_with_bounce_buffer_write_fail(void *bcs, int64_t start, int ret) "bcs %p start %"PRId64" ret %d"
block_copy_with_offload_fail(void *bcs, int64_t start, int ret) "bcs %p start %"PRId64" ret %d"
# ../blockdev.c
qmp_block_job_cancel(void *job) "job %p"