Howdy,
How does one get the exact size (in blocks preferably, but bytes okay)
of the filesystem inside a partition? I know how to get the partition
size, but that's not useful when shrinking a partition...
So, for example, you successfully do
btrfs filesystem resize -32G /dev/sdz2
now you've got "some space" zero idea how many sectors can be trimmed
off the end of the partition, you can do the math but thats a little
iffy, especially if the file system didn't originally fill the partition
to begin with.
The current methodology for most such actions is to way over-trim the
file system, then reallocate the space using your partition tool of
choice, then re-grow the filesystem to fit. This has been the way of
things forever and it blows...
There needs to be an option to btrfs filesystem show that will tell you
XXXXXblocks, not Y.ZZ terabytes.
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