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braindevices/CoW_podman-docker_mounted_volume.md

Created September 3, 2024 20:41
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reflink can directly work with mounted volumes if the volumes are on the same host partition
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CoW_podman-docker_mounted_volume.md

reflink in mounted volume

podman run -v /data/devspace/dummy/test/A:/mnt/A:Z -v /data/devspace/dummy/test/B:/mnt/B:Z --rm -it ubuntu:latest /bin/bash

following works fine

root@68ec02c9b450:/mnt# cp --reflink=always A/test10M.bin A/reflinked.bin
[dummy@host test]$ xfs_io -r -c 'fiemap' A/reflinked.bin 
A/reflinked.bin:
        0: [0..20479]: 29692735488..29692755967
[dummy@host test]$ xfs_io -r -c 'fiemap' A/test10M.bin 
A/test10M.bin:
        0: [0..20479]: 29692735488..29692755967

cross different mount also works

root@68ec02c9b450:/mnt# cp --reflink=always A/test10M.bin B/reflinked.bin
[dummy@host test]$ xfs_io -r -c 'fiemap' B/reflinked.bin 
B/reflinked.bin:
        0: [0..20479]: 29692735488..29692755967
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