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Concept
Filesystem in Userspace
Summary
Filesystem in Userspace (FUSE) is a software interface for Unix and Unix-like computer operating systems that lets non-privileged users create their own s without editing kernel code. This is achieved by running file system code in user space while the FUSE module provides only a bridge to the actual kernel interfaces.
FUSE is available for Linux, FreeBSD, OpenBSD, NetBSD (as puffs), OpenSolaris, Minix 3, macOS, and Windows.
FUSE is free software originally released under the terms of the GNU General Public License and the GNU Lesser General Public License.
The FUSE system was originally part of AVFS (A Virtual Filesystem), a filesystem implementation heavily influenced by the translator concept of the GNU Hurd. It superseded , and provided a translational interface using in libfuse1.
FUSE was originally released under the terms of the GNU General Public License and the GNU Lesser General Public License, later also reimplemented as part of the FreeBSD base system and released under the terms of Simplified BSD license. An ISC-licensed re-implementation by Sylvestre Gallon was released in March 2013, and incorporated into OpenBSD in June 2013.
FUSE was merged into the mainstream Linux kernel tree in kernel version 2.6.14.
The userspace side of FUSE, the library, generally followed the pace of Linux kernel development while maintaining "best effort" compatibility with BSD descendants. This is possible because the kernel FUSE reports its own "feature levels", or versions. The exception is the FUSE fork for macOS, OSXFUSE, which has too many differences for sharing a library. A break in libfuse history is libfuse3, which includes some incompatible improvements in the interface and performance, compared to the older libfuse2 now under maintenance mode.
As the kernel-userspace protocol of FUSE is versioned and public, a programmer can choose to use a different piece of code in place of and still communicate with the kernel's FUSE facilities. On the other hand, and its many ports provide a portable high-level interface that may be implemented on a system without a "FUSE" facility.
Official source
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