Inode Structure

File/Dir

Owner

Access

Size

Links

p0

p1

p2

p3

p4

p5

p6

p7

p8

I1

I2

I3

File/Dir = 1/0 (File = 1, Dir = 0).

Owner = login inode when file was created.

Access = owner/group/world (read/write/execute).

Size = file/directory size in bytes.

Links = Number of hard links to inode.

p0 – p9 = direct block pointer.

I1 = block pointer with one level of indirection.

I2 = block pointer with two levels of indirection.

I3 = block pointer with three levels of indirection.

If a block can contain 256 pointers,

max file block size = 9 + 256 + 256*256 + 256*256*256