fstrim should trim free space, but it only trims unallocated. This is
with kernel 4.14.0 and the entire 4.13 series. I'm pretty sure it
behaved this way with 4.12 also.
[root@f27h ~]# fstrim -v /
/: 39 GiB (41841328128 bytes) trimmed
[root@f27h ~]# btrfs fi us /
Overall:
Device size: 70.00GiB
Device allocated: 31.03GiB
Device unallocated: 38.97GiB
Device missing: 0.00B
Used: 22.02GiB
Free (estimated): 47.72GiB (min: 47.72GiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 65.97MiB (used: 0.00B)
Data,single: Size:30.00GiB, Used:21.25GiB
/dev/nvme0n1p8 30.00GiB
Metadata,single: Size:1.00GiB, Used:791.58MiB
/dev/nvme0n1p8 1.00GiB
System,single: Size:32.00MiB, Used:16.00KiB
/dev/nvme0n1p8 32.00MiB
Unallocated:
/dev/nvme0n1p8 38.97GiB
--
Chris Murphy
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