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backup: move from done_bitmap to copy_bitmap 

Use HBitmap copy_bitmap instead of done_bitmap. This is needed to
improve incremental backup in following patches and to unify backup
loop for full/incremental modes in future patches.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20171012135313.227864-3-vsementsov@virtuozzo.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2017-10-12 16:53:10 +03:00 committed by Jeff Cody
parent 56207df55e
commit a193b0f0a8
1 changed files with 14 additions and 9 deletions
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23
block/backup.c
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@ -40,11 +40,12 @@ typedef struct BackupBlockJob {
BlockdevOnError on_target_error;
CoRwlock flush_rwlock;
uint64_t bytes_read;
unsigned long *done_bitmap;
int64_t cluster_size;
bool compress;
NotifierWithReturn before_write;
QLIST_HEAD(, CowRequest) inflight_reqs;
HBitmap *copy_bitmap;
} BackupBlockJob;
/* See if in-flight requests overlap and wait for them to complete */
@ -109,10 +110,11 @@ static int coroutine_fn backup_do_cow(BackupBlockJob *job,
cow_request_begin(&cow_request, job, start, end);
for (; start < end; start += job->cluster_size) {
if (test_bit(start / job->cluster_size, job->done_bitmap)) {
if (!hbitmap_get(job->copy_bitmap, start / job->cluster_size)) {
trace_backup_do_cow_skip(job, start);
continue; /* already copied */
}
hbitmap_reset(job->copy_bitmap, start / job->cluster_size, 1);
trace_backup_do_cow_process(job, start);
@ -132,6 +134,7 @@ static int coroutine_fn backup_do_cow(BackupBlockJob *job,
if (error_is_read) {
*error_is_read = true;
}
hbitmap_set(job->copy_bitmap, start / job->cluster_size, 1);
goto out;
}
@ -148,11 +151,10 @@ static int coroutine_fn backup_do_cow(BackupBlockJob *job,
if (error_is_read) {
*error_is_read = false;
}
hbitmap_set(job->copy_bitmap, start / job->cluster_size, 1);
goto out;
}
set_bit(start / job->cluster_size, job->done_bitmap);
/* 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.
*/
@ -260,7 +262,7 @@ void backup_do_checkpoint(BlockJob *job, Error **errp)
}
len = DIV_ROUND_UP(backup_job->common.len, backup_job->cluster_size);
bitmap_zero(backup_job->done_bitmap, len);
hbitmap_set(backup_job->copy_bitmap, 0, len);
}
void backup_wait_for_overlapping_requests(BlockJob *job, int64_t offset,
@ -425,19 +427,22 @@ static void coroutine_fn backup_run(void *opaque)
BackupBlockJob *job = opaque;
BackupCompleteData *data;
BlockDriverState *bs = blk_bs(job->common.blk);
int64_t offset;
int64_t offset, nb_clusters;
int ret = 0;
QLIST_INIT(&job->inflight_reqs);
qemu_co_rwlock_init(&job->flush_rwlock);
job->done_bitmap = bitmap_new(DIV_ROUND_UP(job->common.len,
job->cluster_size));
nb_clusters = DIV_ROUND_UP(job->common.len, job->cluster_size);
job->copy_bitmap = hbitmap_alloc(nb_clusters, 0);
hbitmap_set(job->copy_bitmap, 0, nb_clusters);
job->before_write.notify = backup_before_write_notify;
bdrv_add_before_write_notifier(bs, &job->before_write);
if (job->sync_mode == MIRROR_SYNC_MODE_NONE) {
/* All bits are set in copy_bitmap to allow any cluster to be copied.
* This does not actually require them to be copied. */
while (!block_job_is_cancelled(&job->common)) {
/* Yield until the job is cancelled. We just let our before_write
* notify callback service CoW requests. */
@ -512,7 +517,7 @@ static void coroutine_fn backup_run(void *opaque)
/* wait until pending backup_do_cow() calls have completed */
qemu_co_rwlock_wrlock(&job->flush_rwlock);
qemu_co_rwlock_unlock(&job->flush_rwlock);
g_free(job->done_bitmap);
hbitmap_free(job->copy_bitmap);
data = g_malloc(sizeof(*data));
data->ret = ret;