Inode Bitmap

The "Inode Bitmap" works in a similar way as the "Block Bitmap", difference being in each bit representing an inode in the "Inode Table" rather than a block. Since inode numbers start from 1 rather than 0, the first bit in the first block group's inode bitmap represent inode number 1.

There is one inode bitmap per group and its location may be determined by reading the "bg_inode_bitmap" in its associated group descriptor.

When the inode table is created, all the reserved inodes are marked as used. In revision 0 this is the first 11 inodes.