In Memory File System

A simple in-memory file system written in C.

This project marks my first venture into the world of file systems and was inspired by the structure of the Linux VFS.

The goal was to provide a way to store data permanently on addressable non-volatile memories (such as flash), while remaining light enough to be used in resource-constrained embedded environments.

Specs

• Supports hard links,
• Lacks complex file operations like renaming or moving the file r/w pointer,
• No support for multi-threaded usage. User code must handle serialization when accessing the file system,
• Not atomic with respect to failures during operations.

Usage

Simply add imfs.c to your project and include imfs.h. That's all you need! :)

Example

Using IMFS is simple as:

struct imfs *fs = imfs_init(base_mem, mem_size, &c, true);
int fd = imfs_open(fs, "/file1", IMFS_CREAT | IMFS_RDWR);
imfs_write(fs, fd, wbuf, len);
imfs_read(fs, fd, rbuf, BSIZE);
imfs_close(fs, fd);

Use make example && ./example to compile and run an example program.

Tests & Coverage

A combination of random tests and common usage patterns was used for testing.
Run make tests to compile and execute the tests; run make cov to execute the tests with code coverage.