litfs
This FUSE filesystem, apart from providing the normal file I/O operations, implements persistence by emulating a single binary Unix file as disk and performing read/writes on it.
Build and Run
go get github.com/anaskhan96/litfs
cd $GOPATH/src/github.com/anaskhan96/litfs
go run main.go data # data/ is the directory on which to mount the filesystem on
Run umount <path-to-directory> to unmount the filesystem.
File System Characteristics
- Create, remove a directory
- Create, remove, read from, and write to files inside a directory
- Copy, move the contents of a file to another, across directories
Persistence Implementation
disklib/sda is the created binary file emulating a disk. Keeping a block size of 4096 bytes:
- A serialized form of the tree representation of the filesystem is stored in the first block
- A structure containing two components - a bitmap indicating free and allocated blocks in the filesystem and an integer containing the lowest free block at the moment - is serialized and stored in the second block
- File data is stored from the third block onwards, with a block as a whole being allocated to/deallocated from the file
This project was built under the course Unix Systems Programming in PES University.
