Mergerfs Versions Save

• fix parsing of relative branch paths

• reset dentry buffer when rewind'ed

Wasn't clearing dentry buffer when rewinding stream.

Sorry for missing packages. Something is up with some of the build images I use. Will update when fixed.

• f50812a dirname should not return an empty string
• 5e08357 update cirrus-ci builds
• 44a9891 msp policies stopped before root path

Fixes a possible segv. After some restructuring certain data structures weren't properly initialized. Might fix #849.

• 3900543 fix segv: zero out data structures

Mostly a bug fix but some slight refactoring was done too.

• 7edd3c6 config: fix invalid error check when parsing config file
• 1b26f49 general cleanup, slight memory reduction
• c3fffef msp policies: used wrong path to check existence
• 7e583e3 use relative option for rsync

Summary:

• Lots of cleanup
• new policies: prfd, eppfrd, msppfrd
• per branch minfreespace
• replace fasthash with wyhash for inode calculation and other hashing. fasthash had issues on some platforms.
• better error handling for certain functions

Full changelog:

• 8990e24 README.md: add details on per branch minfreespace
• f6e37c5 README.md: add details about error handling
• 0484442 wyhash: use safety mode 1
• 5a31843 rework some function error handling
• 610c75f properly return const ref from tofrom string wrapper
• 73e8ed7 Delete issue_template.md
• 0b1af2b Update bug_report.md
• 767039c option_parser: return 0 when requesting help or version
• fc34539 branches: add per branch minfreespace w/ original value as default
• 27bd39f README.md: fix typos
• 6311df7 optionally use lchmod depending on if on Linux or not (BSD)
• 15fb751 README.md: add note indicating only tagged releases are supported
• 0468440 add {,ep,msp}pfrd policies
• 8675fce add fedora builds to cirrus-ci
• 7fd629e add #warning to make it more obvious what versions of functions are used
• 2fe20b8 clean up and separate out fs_* files
• 2696079 break fs.hpp up into separate files
• ec15872 cleanup function signatures and definitions
• 6cc6524 change category to enum class
• 7e17310 libfuse cleanup: add more header include guards
• f488deb libfuse/Makefile: support CXXFLAGS and LDFLAGS passed via environment
• 678626e Makefile: support CXXFLAGS and LDFLAGS passed via environment
• 0bc6711 libfuse/Makefile: support $AR
• a925fbe libfuse cleanup: extern cplusplus cleanup
• dc1b698 libfuse cleanup: remove single threaded
• 3c761b7 libfuse cleanup: remove libfuse API compatibility
• 3bfdd78 libfuse cleanup: remove cuse
• 5f12fb6 libfuse cleanup: remove unnecessary files
• f9b831e libfuse cleanup: reindent
• badf7e1 README.md: add XMR address
• 3b38262 README.md: update support section with Open Collective and LBC
• 0371b04 change from fasthash64 to wyhash
• 1fe32e9 fix: add fakeroot needed for building

If you find mergerfs and/or my other work useful please consider supporting their development.

Features

• inodecalc: new argument that allows controlling how inodes are calculated. Can help with NFS stale file handle errors.
• nfsopenhack: new argument that helps working around issues with certain issues with NFS not being fully POSIX compatible when exporting mergerfs.
• new msp policies: "most shared path". Like ep path preserving policies but will walk back the directory tree till something is found.
• readdirplus: when a readdir happens mergerfs can stat files at the same time. Similar to the NFS feature. Might improve directory listing performance depending on use case.
• config file: Allows you to put config arguments in a "ini" like file (key=val) and reference that in the mount options.
• new runtime API based on ioctl (will be removing the xattr based API in mergerfs 3.0)
• moveonenospc: now uses policies just like the regular filesystem functions providing more control over where the file goes.

Bug fixes

• Fix building on FreeBSD
• Reworked readdir code in general and fixed a NFS readdir race condition that is in libfuse
• inodecalc algo that makes mergerfs work better with some 32bit software that doesn't handle 64bit inode values
• inodecalc algo that helps with changing files out of band problems when exporting mergerfs through NFS.
• fixed deb package building that broken mounting as non-root

misc

• misc updates to docs
• general code cleanup
• prep for mergerfs v3.0 (which will be a breaking change with regard to options)

Changelog:

• 30d13b7 inodecalc: add 32bit versions of hashs
• 5989d41 readdir: use getdents64 for compatibility with ARM64
• 1d2a1ba README.md: move kernel bugs to wiki
• e639f3d README.md: update faq regarding Plex and page caching
• 173193d Update issue templates
• 0709b2e add missing options to usage
• 15a0aed cleanup: move some config data structures to separate files
• 8afe72d README: change back to listing fuse.mergerfs for fstab fstype
• a93bd9f freebsd: misc cleanups to get freebsd compiling
• 139e61e nfsopenhack: remove empty file check
• 93218a3 NFS open/creat hack
• 3ec137c policy: add "most shared path" policies
• 3a67384 Fix typos
• 468d420 Removed duplicated include
• 08d267f moveonenospc: enhance the feature to allow using a policy
• c4a85f5 readdir: add dirent index array
• c099064 remove unnecessary libfuse flags nopath, nullpath_ok, and utime_omit_ok
• 6289956 temporary fix for short readdirs on NFS
• d699a97 fix rpm spec and chmod in deb
• 8ed3a1f debian: fix installing of fresh deb
• b4397f7 add 'inodecalc' option to allow selection of inode calculation algo
• dbdd3e2 additional readdir refactor cleanup
• afb07b1 add Cirrus-CI
• 54c41c4 rework config management
• a0c1c1a Travis-CI: add installing of deb package
• add588f README: add terminology section and tweak some things
• eb78c51 README: update support section
• c6bce81 fix install location and setuid setting in deb pkgs
• aad2257 README.md: add human readable versions of some errno references
• eff15c7 README.md: request users update to latest version before they submit report
• 7c37a69 add basic setup section
• 698c414 fix getdent name length calculation
• 0888ee1 README: update a number of sections and fix typos
• 8ba1aba README: add note regarding space calculations
• 3a46ec9 fix filename hashing error
• 9b2634a fix name length calculation for musc
• 62873d2 use getdents64 on linux
• d119807 restructure readdir, add readdir_plus

https://github.com/trapexit/mergerfs#writeback-caching https://github.com/trapexit/mergerfs#how-are-inodes-calculated

• 5ce428c rework makefiles + install mount tools
• a646fe0 change inode conversion algo to reduce collision
• 576ff36 add cache.writeback to xattrs
• bf4b390 update fuse_kernel.h
• 4b9f3de add ctime support
• 903d39f add writeback caching
• 9952c58 add links to ZFS comparison
• 66f0d9e add faq entry on files ending up on 1 branch
• 0f2f78c python 2.6 fix
• 489ab23 make git2debcl work on Python 2 & 3
• 3897852 add README segment on benchmarking
• f4b8efc more FAQs
• 4625a3c fix typos and update FAQ regarding policy preference
• 322fa57 update docs: openvz kernel bug and new support links
• 5eb3c8c add github sponsor and subscribestar to funding
• 5d82756 Create FUNDING.yml

If you like mergerfs consider supporting the project: https://github.com/trapexit/mergerfs#support-development

• 4d82ed9 fix short writes on >2GB files when cloning file
• 08e1bef improve nodeid generation
• 58ab7f7 Fix typo
• 7a84555 update travis config to include bionic

• 0fffabf only return 1 branch for rand/eprand policies
• 50ad648 initialize mutex to fix lockup
• 752a159 add UPGRADE section
• f77d1d9 Force symlink creation (don't error if it already exists)
• e6a6ab9 update how it works
• 38919ad Update README.md
• 86bda61 fix some grammar and typos
• 4c4c27a set uid & gid when calling ioctl