Greetings everyone.
I've recently rebalanced my btrfs (kernel 3.13) running on two SSD
drives (raid-0) and a question arose.
Does btrfs perform TRIM on SSD balance? Fs is mounted with 'ssd' option,
but not 'discard'.
It seems fstrim only trims free chunks in allocated space, so we
possibly having a "trim leak" if no special treatment is taken on blocks
reallocated during balance operation.
root@midnight:/mnt/tmp# fstrim -v /
/: 0 bytes were trimmed
root@midnight:/mnt/tmp# btrfs fi df /
Data, RAID0: total=90.00GiB, used=86.84GiB
System, RAID1: total=32.00MiB, used=12.00KiB
Metadata, RAID1: total=4.00GiB, used=2.56GiB
root@midnight:/mnt/tmp# btrfs fi show /
Label: ssdbtrfs uuid: f61f749b-dce6-4e73-9d53-693e93ad61aa
Total devices 2 FS bytes used 89.41GiB
devid 1 size 111.31GiB used 49.03GiB path /dev/sda2
devid 2 size 111.31GiB used 49.03GiB path /dev/sdb2
Btrfs v3.12
Best regards,
Sergey E. Kolesnikov
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