trapexit/mergerfs 2.36.0 on GitHub

Change Summary

Allow user to define depth of process thread message queues. Previously these were unbounded and "FORGET" message floods would bloat memory.
O_DIRECT now supported, mostly. If software attempt to change the O_DIRECT flag on the fly using fcntl(F_SETFL) it won't work as that is not supported by FUSE.
Fix bug in moveonenospc file moves when the file was opened in append mode.
When a create function fails with EROFS (which really only happens when an ext4 filesystem errors) the relevant branch will be marked as mode = RO and the call tried again.
Add ability to trigger memory cleanup via custom ioctl calls or signal SIGUSR2.
Add ability to trigger invalidation of all nodes to flush memory using custom ioctl or signal SIGUSR1.

Fix crash when exiting with open deleted files by @trapexit in #1170
Make srcmounts readonly by @trapexit in #1171
Fix move when in append mode + fix read/write direct_io vs cached behavior by @trapexit in #1203
Add manual GC triggering + configurable process queue depth by @trapexit in #1204
Fix error handling for cached writes by @trapexit in #1206
Fix build on older distros due to std::atomic definitions by @trapexit in #1207
Simplify syslog wrapper a bit by @trapexit in #1208
Align msg buffer memory to allow O_DIRECT to work by @trapexit in #1209
Create functions can set branches RO on EROFS by @trapexit in #1212

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