Questions tagged [file-systems]

techniques to organize and store files with their data on a computer.

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1answer
43 views

When to use dot files in Git repositories?

My Git repository contains dot files required by my tooling: .dockerignore .gitignore .pre-commit-config.yaml I'm using Azure Pipelines for CI/CD, which is typically defined in azure-pipelines.yml, ...
0
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1answer
41 views

PHP: What code should be removed to its own helper class and where should such classes be located in the filesystem?

The following is an example requesting an explanation for one specific file in one specific filesystem, not helper classes generally. I have configured a LEPP stack on a CentOS server. The server ...
-1
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1answer
161 views

fake filesystem for unit tests

I am writing an application in c++ and Qt5. It would be very convenient for me to create a virtual file system so I can unit test code working on files. I have found that in Qt4 there was a ...
0
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1answer
40 views

Test logging library

I've been designing and developing a very scalable logging library for a while. The main goal of this library is pretty simple. Like many others projects, a simple goal does not mean a simple way the ...
4
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1answer
115 views

Solving file system dependency with database storage

I have a software project A which makes API calls to a third-party software B that is heavily based on data stored on the file system. Also, those software and file systems are distributed on servers ...
2
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0answers
104 views

Is it possible to implement insert file operation in modern extent-based filesystems?

The problem was already discussed here. But there was not consensus on this topic. I have some thoughts on how insert operation can be implemented for some popular file systems. If FS has extent-...
0
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1answer
88 views

I'm building a file management app and need to know the best approach for dealing with folders

So you open up file explorer on your computer and can create folders, add files, rename, etc. I'm doing the same thing in a web application that interacts with the file system on the server. I'm ...
-4
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2answers
57 views

Hosting a file system in production?

Sorry if this is broad. But I'm confused on how to scale a file system. I'm currently working on the server side of a webapp with Node(Express)js, its file system module, and mongoDB. I'm storing ...
2
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0answers
38 views

What is the most efficient way to find filesystem changes in percentage?

I am planning to write a program that will produce digest logs for file changes in a particular directory. The idea is that whenever a file is deleted in a particular directory, it will show up in the ...
1
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1answer
79 views

How to access a file stored locally on server?

I am working on a web application which allows users to review pdf documents. These documents are submitted from another public facing website. A typical workflow involves: A document is uploaded on ...
0
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3answers
150 views

How to append a chunk of fixed size data to a file and make sure this chunk doesn't get fragmented on disk?

So i want to understand how DBMS implementation works To give an example : MySQL implements each tables with its own pages, which are 16KB so each table is a file, and is a multiple of 16KB, ...
2
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3answers
92 views

Does a replicated distributed file system minimise the need for durability?

I've been investigating various distributed file systems, like Gluster, Ceph, Moose and Lizard. I'm also familiar with various key/value store type systems, some of which do not perform any system ...
2
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4answers
366 views

Why do disks write data in chunks of page size?

In my understanding, even if i want to overwrite a byte in middle of a file, OS and/or disk will read the content of the size of page, modify one byte and then write the contents back. What is the ...
0
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2answers
176 views

Referencing custom Python modules and data files

I'd want to deploy my Python code and relevant static files such that only a copy of a folder is needed. That is, all the paths inside are relative. The release is to a web server, which calls scripts ...
1
vote
1answer
714 views

Chat application - write to file and then save in database

I have followed this approach that is described here to implement a simple chat application: https://code.tutsplus.com/tutorials/how-to-create-a-simple-web-based-chat-application--net-5931 I'm ...
0
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2answers
98 views

Detect when a file is created (on a webserver) and ready for use in one of many directories

I have an odd, intermittent bug that is happening on a web server. One of the methods triggers the creation of a small file (3kb), in a folder. The folder is based on the current year, month and ...
1
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2answers
739 views

Store file in filesystem, and its metadata to the database atomicly

I have to store many pdf/jpg/png file of max 10mb in a filesystem, and need to save their metadata on a database. The SFTP and the DB may be on different nodes. On WS, I've a local db where I can ...
0
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1answer
260 views

Using A XML as a Directory File To support A file Managing Application

Second Year Software Engineering student here. I want to make a file managing system for a C# notetaking app, every note will be represented by a file and will display a small preview of it, ...
12
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2answers
629 views

Does a file system “see” the storage device as a (very large) byte array?

I want to know how does a file system write to and read from a storage device. I think this is how it works: A file system doesn't access the storage device directly, but rather the storage device ...
1
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0answers
111 views

Classiest file system locations for my Linux app to write its files?

I have an application I am writing on Linux. It is a Java webapp intended to be run on Tomcat. When it initializes, my application will copy some standalone java utility programs to the host ...
3
votes
2answers
132 views

Dealing with potential failures when appending data to a file on disk

I'm designing an application that will be appending blobs to a file on disk (local filesystem) and I'm currently thinking of how to deal with consistency issues that could occur if: The application ...
3
votes
4answers
714 views

Can file systems be designed and implemented in an OS-portable way?

Given the interfaces that major OSes (Windows, macOS/OS X/Mac OS X, Linux) provide to file systems, can file systems be designed and implemented in a way that is largely independent of OS? I'm not at ...
1
vote
1answer
170 views

Controlling permissions for content on web server (pattern/architecture)

I’m working on a proof of concept for a personal project and am unsure how to go about handling ‘permissions’ on content that is uploaded into the application. Problem: In this application users ...
2
votes
6answers
594 views

What are the benefits of storing data contiguously?

I am designing an application file format which will store chunks of user data, ranging from a few bytes to a few gigabytes - median size probably in the 10MB - 30MB range. I have the option of ...
0
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1answer
195 views

One row database table or JSON file

If I have data that I will only need to update very rarely (once a month), would it be a good idea to use a JSON file instead of a database table with only 1 row?
15
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1answer
4k views

What is the name for the non-extension part of a filename? [closed]

Given the file path: /some/path/abc.txt The filename is "abc.txt", and extension is "txt". What is the "industry standard", unambiguous name for the "abc" part? For reference, in both java's older ...
-1
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1answer
313 views

How do you create a Composite file in C++ [closed]

I am looking to create a "Composite file" in C++, basically a composite file is a file containing files, (examples: .docx, .jar, etc) these files can usually be renamed as .zip and opened with a .zip ...
5
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2answers
1k views

Storing Local Filesystem Paths in Database

I'm developing a webapp where I have sets of data stored locally on my computer and I run a tool which transforms the data and uploads it to my webapp. However, I need to be able to rerun the tool on ...
1
vote
1answer
2k views

Storing uploaded images for website

I'm developing a website (using PHP, JS, and MYSQL) which allow user to upload images. My requirements are as below: User is able to upload 1 or multiple images at a time. Website is able to save ...
4
votes
3answers
921 views

Why would anyone want to build a file system for windows? [closed]

I saw an ad on StackOverflow today for a project called WinFsp. The site mentions the following features: Allows for easy development of file systems in user mode. There are no restrictions on what ...
3
votes
1answer
736 views

VBA Outlook: quickly find subfolder

I have the following structure in my Outlook Public Folders. -Public Folders --1001_RandomProject --1002_AnotherProject --1003_Yetanotherproject ... and so on, basically there's a couple of thousand(...
3
votes
1answer
788 views

What is the most sensible design for making files available for download from a URL?

This is what I need to do, in a nutshell: Generate Excel spreadsheet files (programmatically). Store these .xlsx files in a location where they can be accessed by users later. These files need to be ...
4
votes
3answers
949 views

What's the point of hidden files?

What is the point of hidden files? In Microsoft Windows they exist, in Mac OS X they exist and in Linux they exist. It seems to me that it just makes detecting malware more difficult. The only upside ...
1
vote
2answers
238 views

How are non-folder files called? [closed]

Maybe it looks like a weird question, but what term should be attributed inside the code for files that are not folders to differentiate them from folders? If I need write 2 functions isFolder() and ...
1
vote
2answers
256 views

Can version control systems use the filesystem log to capture changes?

I was trying to find a "perfect" syncing program between a network share and a local folder, when I realised that it's probably impossible to do it right unless all the filesystem operations were ...
21
votes
4answers
5k views

Why is the Git .git/objects/ folder subdivided in many SHA-prefix folders?

Git internally stores objects (Blobs, trees) in the .git/objects/ folder. Each object can be referenced by a SHA1 hash that is computed from the contents of the object. However, Objects are not ...
1
vote
2answers
1k views

Avoid data manipulation by user

I have a C# program (could be any programming language) that saves data to a file on a memory (hard disk, USB drive, etc.). The program uses this data for monitoring its operation time, but it could ...
0
votes
1answer
79 views

What is a simple way to let a user select a folder from a tree?

I have a Python-Flask app in which users can place files into a folder. As of now the directory structure is something like: /app /storage /templates . . . server.py The user ...
6
votes
1answer
5k views

Efficient data structure to implement fake file system

I want to implement a data structure that will hold the paths of directories, sort of fake file system. Input:- I have a text configuration file containing the paths as follows ... C:/temp1 C:/...
0
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2answers
219 views

Is renaming an 'alias' for moving?

Is it true to say (on Windows and Unix\Linux\OS X) that renaming a file or directory is just an alias for moving? e.g. Are there any side effects to either which are not present on the other? Does '...
1
vote
2answers
414 views

Why do filesystems read and write in blocks?

I read that file systems usually access data in blocks, whose size is integral multiple of disk block size. Why don't they read individual disk blocks?
0
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1answer
236 views

Best way to centralise a php project (except bitbucket)

The structure is as follows: A: this is the live/production website B: this is the staging, which is a copy of live C: this is the testing environment for designers 2 developer and 2 designers. Only ...
0
votes
1answer
316 views

Efficient way to map changes in a filesystem hierarchy

I'm currently working on a project that will enable file searching based on metadata found in the file. It'll be comprised of 2 parts: a filesystem crawler that passively scans for changes and ...
0
votes
1answer
49 views

Static analysis for finding capitalisation / case inconsistencies in file names

TLDR; I'm looking for ideas on how to flag code containing file names/paths that have inconsistent capitalisation with the actual file/directory. Situation I am migrating a significant code base ...
0
votes
4answers
192 views

Why is there little use of filesharing as compression (outside of libraries)?

Recently I was looking for a program that will run as a daemon and find files that have the same size/type, check if they're the same, then make both a hard link to a single copy if they are. And I ...
2
votes
1answer
655 views

Data structure well suited for duplicate entries

I'm in the process of getting to know (modern) filesystems. As part of it, I came across log structured filesystems that also handle allocations in a log structured way. I wonder how they handle ...
3
votes
1answer
391 views

Filesystem superblocks and their backup copies

I'd like to understand how (modern) filesystems are implemented and having trouble to fully understand superblocks and their backups. I reference ext4 and btrfs, but the questions may also apply to ...
-2
votes
2answers
139 views

file quantity limit in a directory on a linux file server and why?

What is a good limit to use on the quantity of files in a directory, and why? EDIT: Why shouldn't someone create a system that puts hundreds of thousands of files in the same directory? Why I ask: ...
12
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5answers
27k views

Is it safe to convert Windows file paths to Unix file paths with a simple replace?

So for example say I had it so that all of my files will be transferred from a windows machine to a unix machine as such: C:\test\myFile.txt to {somewhere}/test/myFile.txt (drive letter is irrelevant ...
3
votes
1answer
513 views

How to store the file names, start offset and length while avoiding the issue of self imposed limits (lookup table) or having to scan the entire file?

I am attempting to learn more about C and it's descendants(C++ mainly). I have decided that I would like to create a "file system" of sorts. Not a particularly advanced one mind you but something to ...