linux-ext4 - Re: remove generic_block

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Date:   Wed, 21 Jul 2021 07:37:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     Mikulas Patocka <mikulas@...bright.com>
Cc:     Christoph Hellwig <hch@....de>, Jan Kara <jack@...e.com>,
        Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: remove generic_block_fiemap

On Tue, Jul 20, 2021 at 07:02:10PM +0200, Mikulas Patocka wrote:
> You can download a test HPFS partition here:
> http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/test-hpfs-partition.gz

looks like xfstests doesn't generally work on hpfs, and even if I tried
i would be rather slow due to the lack of sparse files.

So I tested fiemp against a few simple copied over files and it still
works.

There are some cases where the old code reported contiguous ranges
as two extents while the new one doesn't, for rasons that are not
quite clear to me:

--- fiemap.old	2021-07-21 05:00:29.000000000 +0000
+++ fiemap.iomap	2021-07-21 04:57:20.000000000 +0000
@@ -1,3 +1,2 @@
 dmesg:
-	0: [0..66]: 133817..133883
-	1: [67..67]: 133884..133884
+	0: [0..67]: 133817..133884