Hi,
I have an image with a snapshot and some changes after snapshot.
```
$ rbd du backup/f0408e1e-06b6-437b-a2b5-70e3751d0a26
NAME
PROVISIONED USED
f0408e1e-06b6-437b-a2b5-70e3751d0a26@snapshot-eb085877-7557-4620-9c01-c5587b857029
10 GiB 2.4 GiB
f0408e1e-06b6-437b-a2b5-70e3751d0a26
10 GiB 2.4 GiB
<TOTAL>
10 GiB 4.8 GiB
```
If there is no changes after snapshot, the image line will show 0 used.
I did export and import.
```
$ rbd export --export-format 2 backup/f0408e1e-06b6-437b-a2b5-70e3751d0a26 - |
rbd import --export-format 2 - backup/test
Exporting image: 100% complete...done.
Importing image: 100% complete...done.
```
When check the imported image, the image line shows 0 used.
```
$ rbd du backup/test
NAME PROVISIONED USED
test@snapshot-eb085877-7557-4620-9c01-c5587b857029 10 GiB 2.4 GiB
test 10 GiB 0 B
<TOTAL> 10 GiB 2.4 GiB
```
Any clues how that happened? I'd expect the same du as the source.
I tried another quick test. It works fine.
```
$ rbd create backup/test-src --size 10G
$ sudo rbd map backup/test-src
/dev/rbd0
$ echo "hello" | sudo tee /dev/rbd0
hello
$ rbd du backup/test-src
NAME PROVISIONED USED
test-src 10 GiB 4 MiB
$ rbd snap create backup/test-src@snap-1
Creating snap: 100% complete...done.
$ rbd du backup/test-src
NAME PROVISIONED USED
test-src@snap-1 10 GiB 4 MiB
test-src 10 GiB 0 B
<TOTAL> 10 GiB 4 MiB
$ echo "world" | sudo tee /dev/rbd0
world
$ rbd du backup/test-src
NAME PROVISIONED USED
test-src@snap-1 10 GiB 4 MiB
test-src 10 GiB 4 MiB
<TOTAL> 10 GiB 8 MiB
$ rbd export --export-format 2 backup/test-src - | rbd import --export-format 2
- backup/test-dst
Exporting image: 100% complete...done.
Importing image: 100% complete...done.
$ rbd du backup/test-dst
NAME PROVISIONED USED
test-dst@snap-1 10 GiB 4 MiB
test-dst 10 GiB 4 MiB
<TOTAL> 10 GiB 8 MiB
```
Thanks!
Tony
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