EbFS

Encryption based File system

Inode structure:

Technical Specification(Data Structures):

General Overview of Inode Structure

### Overview of Project

Block size of disk : 4096-byte (4 KiB) (which are used by Newer HDDs)

Data Structures:

1. Superblock:

   Attributes of superblock: Size of disk Information of Inode blocks ( total number of inodeblocks , etc..) Information of bitmap blocks ( starting of bit map blocks , etc.. ) Total Size of Superblock: 28 bytes Location in source code:superblock.c

2. Inode:

   Attributes of inodes: Metadata (contains information of filetype, etc.. ) Blockdata (direct blocks ,indirect blocks , etc..) And other information containing flag like is Allocated.

   Total Size of Inode : 72 bytes Maximum Number of inodes in per block : 50 inodes per block Location in source code: inode.c and inode.h

3. File_entry:

   Attributes of File_entry: File name Inode number

   Total size of File_entry : 32 bytes [ 28 bytes of file-name + 4 bytes of inode number ]. Maximum number of File_entry in each block : 128 Location in source code:filesystem.c

4. Union block_rw:

   Attributes of block_rw: Char array of size 4096 bytes Super block Array of inode block Array of file entries Size of block_rw : Block size of disk ( 4096 bytes) Location in source code:filesystem.c Disk can not be read and write single bit and byte.We have to read and write in terms of block size of disk.That’s why we
   used Union block_rw for reading and writing data into disk.

Assumption :

• We are using Disk emulator which has no IO scheduling algorithms.