Hi, I took a look a this again, to see how much of a potential gain it would provide, and here is what I found:
# df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cryptvol 98G 76G 22G 79% /
# btrfs inspect-internal min-dev-size /
104517861376 bytes (97.34GiB)
In other words, it doesn't look like one of the existing (safe)
approaches would be useful.
I'm guessing that this is the difference between
# btrfs filesystem usage -b /
Device size: 104517861376
Device allocated: 104516812800
BTRFS-FILESYSTEM(8) indicates that "There are two ways to minimize the
filesystem on a given device. The btrfs inspect-internal min-dev-size
command, or iteratively shrink in steps." So I wonder if you're asking
for syntactic candy that shrinks the filesystem by something like 512MB
every step, in a loop, until it gracefully fails. Assuming it
safely and gracefully fails...
Regards,
Nicholas
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