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trying to get my own filesystem working using fuse (filesystem in user space, linux) im really curious on where to get detailed up to date documentation of the operations used?
most time i search for other file system implementations and see what they do, but some operations seem to be not widely used like poll/ioctl or bmap.
and the documentation of the fuse api doesnt help much, cause e.g. the parameters and return values of the operations are not documented thus i have to guess how to use em
so the question is where do i get better information about how such exotic operations are supposed to be implemented?
thx
Yes, you are right, many places you can read that comment saying there is little documentation on FUSE. Perhaps that's because there is so little to document. Or perhaps the implementation is only meant for those who understand the tradeoff of userspace filesystem well enough. So perhaps you can refer to the following documentation, tutorials, slides or even sample codes for more information:
FUSE Design Document (original documentation from Sun?):
http://www.youblisher.com/p/31627-fuse/
http://wr.informatik.uni-hamburg.de/_media/research/labs/2008/2008-03-michael_kuhn-container_library_and_fuse_container_file_system-report.pdf
http://www.oug.org/files/presentations/losug-fuse.pdf
http://sar.informatik.hu-berlin.de/teaching/2013-w/2013w_osp2/lab/Lab-4-FUSE/lab-FUSE_.pdf
http://www.cs.hmc.edu/~geoff/classes/hmc.cs135.201001/homework/fuse/fuse_doc.html (tutorials)
http://www.cs.cmu.edu/~./fp/courses/15213-s07/lectures/15-filesys/index.html
http://www.cs.nmsu.edu/~pfeiffer/fuse-tutorial/
Sample code:
http://fuse.sourceforge.net/helloworld.html
And perhaps this is more research-oriented:
http://www.msrsas.org/docs/sastech_journals/archives/May2011/2.pdf
https://code.google.com/p/s3fs/wiki/FuseOverAmazon
But generally there is a lot of problems/issues (which may be solved through some complex algorithm) with implementing filesystem in userspace, which is why Linus has commented it as "toy":
https://ceph.com/dev-notes/linus-vs-fuse/
15Apr2015 update:
I just found this (and many other slides - just look at the right hand side of this webpage):
http://www.slideshare.net/adorepump/fuse-developing-fillesystems-in-userspace
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When I come across a new kernel function, like those in "linux/list.h" and "sys/kmem.h", my only sources of help are books like "Linux Device Drivers" or the "Linux Cross reference" page. But the book only cover the most commonly used functions, sometimes the obsolete version, and the cross reference page only gives the function implementation without talking about what the parameters are. If I were lucky, I could find people asking about the function online, but that is not always the case. Is there a good documentation for kernel functions like a man page for most user space functions?
There is. Of course "proper" is a matter of opinion.
The Linux Kernel's documentation web pages seems proper to me.
OTOH, I suspect many people would argue that source code itself is the only real proper documentation.
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Just for self education I decided to implement "hello world" distributed file system. The simplest one. And decide to read about theory under this subject.
But... when I asking google about this it shows answers like "how to configure hdfs" or "how to set distributed fs on windows" what is not what I interested in...
Could someone please point me on some good articles or books on this subject.
Thanks a lot!
Well, if you really decided to implement such a file system, you must start with distributed systems. I recommend reading the Tanenbaum reference book http://www.distributed-systems.net/index.php?id=distributed-systems-principles-and-paradigms
Careful, the subject is really complex and distributed systems are all but simple to implement.
If you want to have a look to some already implemented distributed file systems, you may have a look to GFS/GFS2 (from RedHat). You may also have a look to ocfs2 from oracle.
You may also have a look to gluster https://fr.wikipedia.org/wiki/GlusterFS
You may also be able to find some white papers on the google file system (when it was still a university work).
The main problem of such distributed system is the failure detection (detect when a node crashes while writing on the file system => need to make sure there are no corruptions). There are multiple strategy, one may be to implement a journal which is protected by a distributed lock.
Another great (classical) problem is the 'split brain' problem, when the cluster is split in two groups because of a network failure (imagine a switch that is broken). Both groups 'think' that the other one is dead (they cannot communicate with it) but there is no way to make sure that the distant group is not writing data causing the data to diverge.
Hope you find what you want with all this.
Edit:
Now GFS is deprecated, redhat is using and developing 'Ceph'
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I am looking for some good online sources which explain process sychronization,process and threads with practical examples.
i have gone through a lot of theoritical stuff but always face confusion and difficulties when actually trying implement them.
This is a link where you can find the code very useful for thread synchronization.
I started on Tanenbaum's (Wikipedia) "Modern Operating Systems" book then moved on to Linux From Scratch. For practical examples OSDev here and here is a mine of information when you become really hands on. Otherwise, for Windows specifics there are no shortage of books or MSDN literature.
I found Tanenbaum a very entertaining read, he invented the Minix OS which he uses for real world examples. Minix is from around the same era as Linux. Have a look at some of the very early Linux source code release (eg 0.1 or therabouts if you don't want to lose a year of your life studying pure code).
Wikipedia Is Always The Best Online Tutorial Guide. However u can also Check This Link.. If you would like to go with a Pdf Book then u can click Here.. Its really Good Book
this link for NACHOS may be a good help for you. In our undergraduate class we did some good assignments in OS course.
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I have done some searching around the internet trying to find some form of example code that will allow me to simplify trigonometric equations. In my mathematics course-work this year I am required to simplify trigonometric equations, and I intend on adapting the code to work with my TI-89 Titanium CAS, to use in replacement of the tCollect and tExpand functions (that can't seem to get the job done quite as nicely as I'd like it to).
As I can't really find all too much information on the matter I'd like to know if there is any code (preferably C-based) that will help me to simplify these kinds of equations. If not, what kind of algorithm would be best looking into to code myself?
Thanks.
A very powerful system that seems to have the functionality you need is Maxima, an open source computer algebra system. The following manpage describes trigexapand and trigreduce, which would seem to be roughly what you're looking for.
http://maxima.sourceforge.net/docs/manual/en/maxima_15.html
It's in Lisp rather than C, but consider that an adventure :)
Eigenmath is a handy little computer algebra system.
You might find something relevant in Eigenmath's source code.
The HP49/50 series calculators have a variety of trig manipulation functions that may do a better job than the TI-89. The CAS for the HP calculators is open source, but written in an obscure language. You'd be better off checking out the next CAS written by that guy: Giac/Xcas, written in C++.
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Does anyone know of any libraries that decode one or more of the multitude of different scuba dive computer log file formats?
DAN DL7
IRIS / DRAK
Suunto
Oceanlog
Citizen
ProDive
NiTek Logic
DCDS
Ideally I'm looking for code that'll run in .NET, but I'm willing to transcode from other languages if that's the only option.
Links to articles describing formats is appreciated as well. Sample log files would be handy.
I'm considering creating an open source project for this if no such library already exists. If you'd like to contribute, please mention so as a comment or in your answer.
I have no experience with this but Google turned up the library libdivecomputer.
It supports a number of devices and platforms, and the library is LGPL licensed. However, not all brands you mention appear to be supported.
You can always try contacting the manufacturers to get the data. You might have better luck contacting the engineers specifically, if you can find them.
I don't know much about the industry, but I would suspect you can make a case for opening up their formats, because they are primarily hardware manufacturers.