github: winfsp org

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Bill Zissimopoulos
2022-03-02 18:01:21 +00:00
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@ -10,23 +10,23 @@ This document contains a list of known open-source file systems and file system
- https://github.com/lowleveldesign/fsmemfs[fsmemfs] - Memory File System written in F#
- https://github.com/ihaveamac/fuse-3ds[fuse-3ds] - FUSE Filesystem Python scripts for Nintendo 3DS files
- https://github.com/sganis/golddrive[golddrive] - Windows ssh network drive
- https://github.com/billziss-gh/hubfs[hubfs] - File system for GitHub
- https://github.com/winfsp/hubfs[hubfs] - File system for GitHub
- https://github.com/FrKaram/KS2.Drive[KS2.Drive] - Mount a webDAV/AOS server as a local drive
- https://github.com/billziss-gh/nfs-win[nfs-win] - NFS for Windows
- https://github.com/billziss-gh/objfs[objfs] - Object Storage File System
- https://github.com/winfsp/nfs-win[nfs-win] - NFS for Windows
- https://github.com/winfsp/objfs[objfs] - Object Storage File System
- https://github.com/ncw/rclone[rclone] - rsync for cloud storage
- https://github.com/hasse69/rar2fs[rar2fs] - FUSE file system for reading RAR archives
- https://github.com/billziss-gh/redditfs[redditfs] - ls -l /r/programming
- https://github.com/s3fs-fuse/s3fs-fuse[s3fs-fuse] - FUSE-based file system backed by Amazon S3
- https://github.com/netheril96/securefs[securefs] - Filesystem in userspace (FUSE) with transparent authenticated encryption
- https://github.com/billziss-gh/sshfs-win[sshfs-win] - SSHFS for Windows
- https://github.com/winfsp/sshfs-win[sshfs-win] - SSHFS for Windows
- https://github.com/printpagestopdf/WordpressDrive[WordpressDrive] - Windows Userspace Filesystem based on WinFsp that presents a Wordpress Site as a Windows Drive
- https://github.com/emoose/xbox-winfsp[xbox-winfsp] - Adds native support to Windows for the FATX, STFS & GDFX (aka XGD/XDVDFS) Xbox filesystems.
- https://github.com/UtrechtUniversity/YodaDrive[YodaDrive] - Mount a Yoda drive as a local drive
== File System Libraries
- https://github.com/billziss-gh/cgofuse[Go: cgofuse] - Cross-platform FUSE library for Go
- https://github.com/winfsp/cgofuse[Go: cgofuse] - Cross-platform FUSE library for Go
- https://github.com/SerCeMan/jnr-fuse[Java: jnr-fuse] - FUSE implementation in Java using Java Native Runtime (JNR)
- https://github.com/jnr-winfsp-team/jnr-winfsp[Java: jnr-winfsp] - A Java binding for WinFsp using Java Native Runtime (JNR)
- https://github.com/DuroSoft/fuse-bindings[Nodejs: fuse-bindings] - Fully maintained FUSE bindings for Node that aims to cover the entire FUSE api

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= Queued Events - Windows kernel events with IOCP scheduling characteristics
In this article I am discussing _Queued Events_. _Queued Events_ are a Windows kernel synchronization mechanism that I invented for https://github.com/billziss-gh/winfsp[WinFsp - FUSE for Windows]. _Queued Events_ behave like kernel Synchronization Events (i.e. Win32 auto-reset events), but provide scheduling characteristics similar to those of I/O Completion Ports.
In this article I am discussing _Queued Events_. _Queued Events_ are a Windows kernel synchronization mechanism that I invented for https://github.com/winfsp/winfsp[WinFsp - FUSE for Windows]. _Queued Events_ behave like kernel Synchronization Events (i.e. Win32 auto-reset events), but provide scheduling characteristics similar to those of I/O Completion Ports.
== The Problem
@ -92,7 +92,7 @@ We now have to consider what happens when we have one EventSet concurrently with
NOTE: _Queued Events_ cannot cleanly support an EventClear operation. The obvious choice of using KeRemoveQueue with a 0 timeout is insufficient because it would associate the current thread with the KQUEUE and that is not desirable. KeRundownQueue cannot be used either because it disassociates all threads from the KQUEUE.
The complete implementation of _Queued Events_ within WinFsp can be found here: https://github.com/billziss-gh/winfsp/blob/v1.1/src/sys/driver.h#L655-L795
The complete implementation of _Queued Events_ within WinFsp can be found here: https://github.com/winfsp/winfsp/blob/v1.1/src/sys/driver.h#L655-L795
== Queued Events Scheduling Characteristics
@ -102,4 +102,3 @@ Queued Events encapsulate KQUEUE's and therefore inherit their scheduling charac
- They limit the number of threads that can be satisfied concurrently.
These characteristics are desirable because they reduce the number of context switches thus speeding up the WinFsp IPC implementation. Performance testing immediately after the incorporation of _Queued Events_ into WinFsp showed significant performance improvements; profiling with xperf showed that context switches among file system threads were now a relatively rare event!

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== Fsbench
All testing was performed using a new performance test suite developed as part of WinFsp, called https://github.com/billziss-gh/winfsp/blob/master/tst/fsbench/fsbench.c[fsbench]. Fsbench was developed because it allows the creation of tests that are important to file system developers; for example, it can answer questions of the type: "how long does it take to delete 1000 files" or "how long does it take to list a directory with 10000 files in it".
All testing was performed using a new performance test suite developed as part of WinFsp, called https://github.com/winfsp/winfsp/blob/master/tst/fsbench/fsbench.c[fsbench]. Fsbench was developed because it allows the creation of tests that are important to file system developers; for example, it can answer questions of the type: "how long does it take to delete 1000 files" or "how long does it take to list a directory with 10000 files in it".
Fsbench is based on the https://github.com/billziss-gh/winfsp/tree/master/ext/tlib[tlib] library, originally from the *secfs* project. Tlib is usually used to develop regression test suites in C/C++, but can be also used to create performance tests.
Fsbench is based on the https://github.com/winfsp/winfsp/tree/master/ext/tlib[tlib] library, originally from the *secfs* project. Tlib is usually used to develop regression test suites in C/C++, but can be also used to create performance tests.
Fsbench currently includes the following tests:

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@ -15,7 +15,7 @@ NOTE: The file system that we build in this tutorial is suitable for education p
== Prerequisites
This tutorial assumes that you have WinFsp and Visual Studio 2015 installed. The WinFsp installer can be downloaded from the WinFsp GitHub repository: https://github.com/billziss-gh/winfsp. The Microsoft Visual Studio Community 2015 can be downloaded for free from Microsoft's web site.
This tutorial assumes that you have WinFsp and Visual Studio 2015 installed. The WinFsp installer can be downloaded from the WinFsp GitHub repository: https://github.com/winfsp/winfsp. The Microsoft Visual Studio Community 2015 can be downloaded for free from Microsoft's web site.
When installing WinFsp make sure to choose "Developer" to ensure that all necessary header and library files are included in the installation.