Re: [PATCH] Btrfs: add a "df" ioctl for btrfs

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On Tue, Jan 12, 2010 at 03:25:13PM -0500, Josef Bacik wrote:
> df is a very loaded question in btrfs.  This gives us a way to get the per-space
> usage information so we can tell exactly what is in use where.  This will help
> us figure out ENOSPC problems, and help users better understand where their disk
> space is going.

Just as discussed before I think it's a really bad idea.  We always had
df reporting inconsistencies due to the way metadata is managed, and
btrfs isn't special in that way.

so, NACK
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