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block/backup: split shareable copying part from backup_do_cow 

Split copying logic which will be shared with backup-top filter.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190920142056.12778-4-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2019-09-20 17:20:44 +03:00 committed by Max Reitz
parent 1048ddf0a3
commit 0bd0c44372
1 changed files with 32 additions and 15 deletions
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47
block/backup.c
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@ -248,26 +248,18 @@ static int64_t backup_bitmap_reset_unallocated(BackupBlockJob *s,
return ret;
}
static int coroutine_fn backup_do_cow(BackupBlockJob *job,
int64_t offset, uint64_t bytes,
bool *error_is_read,
bool is_write_notifier)
static int coroutine_fn backup_do_copy(BackupBlockJob *job,
int64_t start, uint64_t bytes,
bool *error_is_read,
bool is_write_notifier)
{
CowRequest cow_request;
int ret = 0;
int64_t start, end; /* bytes */
int64_t end = bytes + start; /* bytes */
void *bounce_buffer = NULL;
int64_t status_bytes;
qemu_co_rwlock_rdlock(&job->flush_rwlock);
start = QEMU_ALIGN_DOWN(offset, job->cluster_size);
end = QEMU_ALIGN_UP(bytes + offset, job->cluster_size);
trace_backup_do_cow_enter(job, start, offset, bytes);
wait_for_overlapping_requests(job, start, end);
cow_request_begin(&cow_request, job, start, end);
assert(QEMU_IS_ALIGNED(start, job->cluster_size));
assert(QEMU_IS_ALIGNED(end, job->cluster_size));
while (start < end) {
int64_t dirty_end;
@ -326,6 +318,31 @@ static int coroutine_fn backup_do_cow(BackupBlockJob *job,
qemu_vfree(bounce_buffer);
}
return ret;
}
static int coroutine_fn backup_do_cow(BackupBlockJob *job,
int64_t offset, uint64_t bytes,
bool *error_is_read,
bool is_write_notifier)
{
CowRequest cow_request;
int ret = 0;
int64_t start, end; /* bytes */
qemu_co_rwlock_rdlock(&job->flush_rwlock);
start = QEMU_ALIGN_DOWN(offset, job->cluster_size);
end = QEMU_ALIGN_UP(bytes + offset, job->cluster_size);
trace_backup_do_cow_enter(job, start, offset, bytes);
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);
cow_request_end(&cow_request);
trace_backup_do_cow_return(job, offset, bytes, ret);