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according to https://btrfs.wiki.kernel.org/index.php/Compression#How_do_I_enable_compression.3F there exist a "NOCOMPRESS" flag, how do i set the NOCOMPRESS flag on a file?

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you could certainly have stolen my answer for yourself :)

the easiest is btrfs property set $THING compression none and a defrag to uncompress it. using btrfs property to set the +c force-compression flag is the most flexible, as you can specify a compression type to force, where using chattr it defaults to using zlib.

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  • he's asking about setting NOCOMPRESS and you reply +c which is about setting compression, not unsetting ut
    – poige
    Commented Feb 4, 2021 at 3:19
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You're probably looking for chattr +m 'FILE'

m A file with the 'm' attribute is excluded from compression on file systems that support per-file compression.

The +c option mentioned by @Andrew Keech is the opposite.

Note, however, that there are mount options in btrfs that will disregard the NOCOMPRESS flag, as mentioned in the docs you provided.

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