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Date:   Sat, 10 Aug 2019 00:33:43 -0700
From:   Christoph Hellwig <>
To:     Theodore Ts'o <>
Cc:     Ext4 Developers List <>,,
Subject: Re: [PATCH 1/3] ext4: return the extent cache information via fiemap

On Fri, Aug 09, 2019 at 02:18:29PM -0400, Theodore Ts'o wrote:
> For debugging reasons, it's useful to know the contents of the extent
> cache.  Since the extent cache contains much of what is in the fiemap
> ioctl, extend the fiemap interface to return this information via some
> ext4-specific flags.

Nak.  No weird fs specific fiemap flags that aren't even in the uapi
header.  Please provide your own debug only interface.

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