FUSE 3 driver for the PartFS filesystem.

PartFS is a custom filesystem with extent-based file storage, per-group inode B-trees, FNV-1a directory hashing, CRC32C checksums on all metadata, and a write-ahead journal.

• Read and write: regular files, directories, symbolic links, hard links
• Extent-based storage — up to 4 inline extents per inode
• Inode B-tree with recursive leaf and internal node splitting
• Directory B-tree keyed by FNV-1a 64-bit filename hash
• CRC32C (Castagnoli) checksums on every metadata block
• Inline extended attributes stored in the inode tail
• IFLAG_IMMUTABLE and IFLAG_APPEND flag enforcement
• Clean flag, mount count, and journal state management
• Journal replay on unclean mount (WAL, commit-block delimited)
• Full POSIX permission model: chmod, chown, setuid/setgid/sticky bits

• libfuse3 (FUSE 3.x)
• GCC with C11 support

# Arch Linux
pacman -S fuse3

# Debian / Ubuntu
apt install libfuse3-dev

make

Produces:

• libpartfs.so — shared library with the full driver implementation
• partfs — thin executable that loads libpartfs.so and calls fuse_main

To install system-wide:

sudo make install

• Maximum 4 extents per inode (returns ENOSPC when exceeded)
• Inline xattr space is limited by the 64-byte inode tail
• Only group 0's inode B-tree is used; per-group trees are not yet created
• Driver-side journalling not yet implemented (replay is implemented)

GNU General Public License v2.0 only. See LICENSE.

AnmiTaliDev [email protected]