bug#8001: cp (8.10) sparse handling fails on compressed btrfs (cp/fiemap-2)

[Pádraig Brady]

On 19/02/11 18:28, Mike Frysinger wrote:
> based on other threads (which i havent been following too closely), did we 
> settle on this being a btrfs bug ?
> -mike

Nope, cp 8.10 is not absolved yet.
It may be btrfs not honoring FIEMAP_FLAG_SYNC,
and/or it may be cp needing to handle FIEMAP_EXTENT_ENCODED
specially.

It would help if you ran `sync` before the copy,
to exclude that as a possible issue.

Also `filefrag -v` output for the file on
the compressed BTRFS file system would be helpful.

thanks,
Pádraig.