在 2021-05-11星期二的 22:57 +0800，Qiyu Yan写道：
> Dear folks,
>
> My problem is that new file created at /usr won't be compressed.
>
> I accenticly that none of my files under /usr is compressed[1], so I
> tried to run `sudo btrfs fi def -czstd -v -r /usr` to compress them,
> that seems to work. And `sudo compsize /usr` now gives
> Processed 431312 files, 224528 regular extents (230971 refs), 253758
> inline.
> Type Perc Disk Usage Uncompressed Referenced
> TOTAL 56% 7.2G 12G 13G
> none 100% 3.5G 3.5G 3.5G
> zstd 39% 3.6G 9.2G 9.7G
>
> This seems pretty good, but when I am testing dding to dump a file to
> /usr to test compress for new file, problem happens:
>
> [root@yan-desktop /]# dd if=/dev/zero of=/usr/1 bs=10240 count=1
> 记录了1+0 的读入
> 记录了1+0 的写出
> 10240字节（102 MB，98 MiB）已复制，0.0426441 s，2.4 GB/s
> [root@yan-desktop /]# dd if=/dev/zero of=/etc/1 bs=10240 count=1
> 记录了1+0 的读入
> 记录了1+0 的写出
> 10240字节（102 MB，98 MiB）已复制，0.0585055 s，1.8 GB/s
> [root@yan-desktop /]# compsize /usr/1
> Processed 1 file, 1 regular extents (1 refs), 0 inline.
> Type Perc Disk Usage Uncompressed Referenced
> TOTAL 100% 97M 97M 97M
> none 100% 97M 97M 97M
> [root@yan-desktop /]# compsize /etc/1
> Processed 1 file, 782 regular extents (782 refs), 0 inline.
> Type Perc Disk Usage Uncompressed Referenced
> TOTAL 3% 3.0M 97M 97M
> zstd 3% 3.0M 97M 97M
>
> Just ignore those Chinese output by dd, it doesn't important... But
> as
> you can see: file created at /usr/1 is not compressed at all while
> file
> created at /etc/1 gets compressed. There should not be any difficult
> to
> compress all-zero contents for zstd.
>
> There should not be so much difference between /usr and /etc, they
> are
> in same subvolume named "root" mounted at /.
>
> [root@yan-desktop /]# btrfs su li /
> ID 256 gen 1530662 top level 5 path home
> ID 257 gen 1530662 top level 5 path root
> ID 266 gen 1530614 top level 257 path var/lib/machines
> ID 292 gen 1530585 top level 257 path var/lib/mock
> ...[some container storage subvolumes]
>
> and mount options for / is
> rw,noatime,seclabel,compress=zstd:3,ssd,space_cache=v2,subvolid=257,s
> ub
> vol=/root (subvol=root,noatime,compress=zstd in fstab)
>
> lsattr /|grep -E "var|etc" gives
> /etc
> /var
>
> `btrfs property get /usr` or `btrfs property get /etc` gives empty
> output.
>
> How do I troubleshoot this problem?
>
> [1] That is also a problem since I setup compress after upgrading to
> fedora 34, and have done many package updates since then. So new
> extents written to /usr should be compressed while compsize reports
> none of them.
>
And by setting compress-force=zstd, new files in /usr will get
compressed as expected. I suspect there to be something wrong with the
compressible check process builtin in btrfs?
--
Qiyu Yan
GPG keyid: 0x4FC914F065F2DF12
About: https://fedoraproject.org/wiki/User:Yanqiyu
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