Chapter 10 File System Interface

Question 1

What 4 pieces of information are associated with an open file ?

Answer 1

➢File pointer - last r/w pos = file pos pointer
➢File-open count - tracks number of opens
➢Disk location of the file
➢Access right

Question 2

What is used to track the next read location in a file ?

Answer 2

read pointer

Question 3

What do open-file tables contain ?

Answer 3

information about all open files

Question 4

Why are open-file tables used ?

Answer 4

better performance

Question 5

What are two different ways to access a file ?

Answer 5

Sequential aceess
direct access (relative acc)

Question 6

What are the main file operations ?

Answer 6

Creating, deleting, writing, reading, repositioning

Question 7

What must be done first to a file system before it can be accessed by the system ?

Answer 7

mounted

Question 8

What is another name for file repo and does it require any invovlment of the I/O

Answer 8

“file seek” & No

Question 9

What file attribute is human readable ?

Answer 9

name

Question 10

What file attribute is unique and not human readable ?

Answer 10

Identifier

Question 11

What is used to track the next write location in a file ?

Answer 11

write pointer

Question 12

What is the difference between direct and sequential access ?

Answer 12

sequential - simple, Information in the file is processed in order,

direct - file made up of fixed-length logical records that allow programs to read and write records rapidly in no particular orde