Re: [PATCH] recursive defrag cleanup

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On Tue, Dec 06, 2016 at 12:39:37PM +0800, Anand Jain wrote:
> The command,
>    btrfs fi defrag -v /btrfs
>  does nothing, it won't defrag the files under /btrfs as user
>  may expect. The command with recursive option
>    btrfs fi defrag -vr /btrfs
>  would defrag all the files under /btrfs including files in
>  its sub directories.
> 
>  While attempting to fix this. The patch below 1/1 provides
>  a cleanup. And the actual fix is pending, as to my understanding
>  of nfwt() it does not provide the list of file without
>  files under its sub directories.

What kind of fix do you mean? We could detect if there's a directory in
the list of arguments and assume the recursive mode. I think this is
what most users expect.

Currently passing a directory will defragment the extent tree, but I
think we should extend the defrag ioctl flags to explictly ask for that.
At minimum, a directory without -r could print a warning about what it's
really doing. But I'm open to other ideas.
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