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backup: Deal with filters

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Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2019-06-12 17:46:45 +02:00 • committed by Kevin Wolf
parent 3f072a7fb7
commit 2b088c60bb
3 changed files with 21 additions and 9 deletions
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9
block/backup.c
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@ -297,6 +297,7 @@ static int64_t backup_calculate_cluster_size(BlockDriverState *target,
{
int ret;
BlockDriverInfo bdi;
bool target_does_cow = bdrv_backing_chain_next(target);
/*
* If there is no backing file on the target, we cannot rely on COW if our
@ -304,7 +305,7 @@ static int64_t backup_calculate_cluster_size(BlockDriverState *target,
* targets with a backing file, try to avoid COW if possible.
*/
ret = bdrv_get_info(target, &bdi);
if (ret == -ENOTSUP && !target->backing) {
if (ret == -ENOTSUP && !target_does_cow) {
/* Cluster size is not defined */
warn_report("The target block device doesn't provide "
"information about the block size and it doesn't have a "
@ -313,14 +314,14 @@ static int64_t backup_calculate_cluster_size(BlockDriverState *target,
"this default, the backup may be unusable",
BACKUP_CLUSTER_SIZE_DEFAULT);
return BACKUP_CLUSTER_SIZE_DEFAULT;
} else if (ret < 0 && !target->backing) {
} else if (ret < 0 && !target_does_cow) {
error_setg_errno(errp, -ret,
"Couldn't determine the cluster size of the target image, "
"which has no backing file");
error_append_hint(errp,
"Aborting, since this may create an unusable destination image\n");
return ret;
} else if (ret < 0 && target->backing) {
} else if (ret < 0 && target_does_cow) {
/* Not fatal; just trudge on ahead. */
return BACKUP_CLUSTER_SIZE_DEFAULT;
}
@ -371,7 +372,7 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
return NULL;
}
if (compress && !block_driver_can_compress(target->drv)) {
if (compress && !bdrv_supports_compressed_writes(target)) {
error_setg(errp, "Compression is not supported for this drive %s",
bdrv_get_device_name(target));
return NULL;