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Date:   Tue,  4 Jan 2022 22:14:36 -0500
From:   "Theodore Ts'o" <>
To:     Jan Kara <>
Cc:     "Theodore Ts'o" <>,
        Lukas Czerner <>,
Subject: Re: [PATCH] ext4: Avoid trim error on fs with small groups

On Fri, 12 Nov 2021 16:22:02 +0100, Jan Kara wrote:
> A user reported FITRIM ioctl failing for him on ext4 on some devices
> without apparent reason.  After some debugging we've found out that
> these devices (being LVM volumes) report rather large discard
> granularity of 42MB and the filesystem had 1k blocksize and thus group
> size of 8MB. Because ext4 FITRIM implementation puts discard
> granularity into minlen, ext4_trim_fs() declared the trim request as
> invalid. However just silently doing nothing seems to be a more
> appropriate reaction to such combination of parameters since user did
> not specify anything wrong.
> [...]

Applied, thanks!

[1/1] ext4: Avoid trim error on fs with small groups
      commit: a4934e25c01ed056dc4af8bef086616e3b083a14

Best regards,
Theodore Ts'o <>

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