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Date:   Sat, 3 Oct 2020 01:23:59 -0400
From:   "Theodore Y. Ts'o" <>
To:     "Darrick J. Wong" <>
Cc:     linux-ext4 <>
Subject: Re: [PATCH] ext4: limit entries returned when counting fsmap records

On Thu, Oct 01, 2020 at 03:21:48PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <>
> If userspace asked fsmap to try to count the number of entries, we cannot
> return more than UINT_MAX entries because fmh_entries is u32.
> Therefore, stop counting if we hit this limit or else we will waste time
> to return truncated results.
> Fixes: 0c9ec4beecac ("ext4: support GETFSMAP ioctls")
> Signed-off-by: Darrick J. Wong <>

Applied, thanks.

					- Ted

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