I try to understand what exactly is trimmed in case of btrfs. Using
installation in QEMU I see that host file size is about 9GB, allocated
size in guest approximately matches it and used space in guest is 7.6GB.
After some experimenting it looks like host size follows "Device
allocated" value in "btrfs filesystem usage" which leads me to believe
trim only considers space outside of allocated chunks. Is it correct?
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