Percentage Free Random Distribution
Chooses a random branch based on the available space percentage free.
IE: if branch A has 1G free and branch B has 2G then B should be chosen
twice as often.
wyhash has very good performance for small keys (our usecase) and
works on platforms with alignment concerns.
A user had an issue where fasthash64 lead to misaligned reads and
signal exceptions. wyhash does not have such issues and is faster.
Like path preserving but walks back the path till a match is found. Should
cover the usecase where someone wants a "less strict" form of path
preservation.
Just like functions you can now set a policy for moveonfreenospc. This
allows for more flexibility.
For backwards compatibility moveonfreenospc=true is converted to
moveonfreenospc=mfs.
minfreespace does apply which is slightly different from original behavior.
Linux 4.20 and above allow setting the number of pages per FUSE message
upto 256 (4K * 256 = 1MiB). This can greatly increase read and write
speeds depending on the workload.
addresses #521
mergerfs is written using libfuse's high level API. The HLAPI forces a certain
behavior with regard to unlinking or rename overwriting of open files. It
renames the file to .fuse_hiddenXXXXXX and when incoming requests refer
to the unlinked file it will use path based calls and use that path.
This behavior leads to rmdirs failing or some software noticing
the .fuse_hidden files.
This patch changes the HLAPI and removes entirely the .fuse_hidden behavior.
See the README for more.