A file system maintains the following information for each file: Name Size (in b

Question

A file system maintains the following information for each file: Name Size (in bytes) Owner ID Last access timestamp Group ID Creation timestamp An ordered list of physical allocation units Last modification timestamp Access permissions If the file system differentiates between logical files and physical files, the information above must be partitioned. Mark each item above with an "L" or "P" to indicate its association with the logical or physical (respectively) identity of the file. What file system structure contains the information about the physical file? What file system structure contains the information about the logical file?

Explanation / Answer

1 ) Name --------------L

Size (in bytes) -----------L

Owner ID ----------------L

Last Access Timestamp ------------------L

Group ID -----------------L

Creation Timestanp ------------------L

An Ordered list of physical allocation units --------------- P

Last modification Timestamp ---------------------L

Access Permissions -----------------------L

2) The physical file system structure resides on the disk which has storage and maps logical to physical data , The file control block in the system consists of information about the file in Inode . The file can be stored physically as Bytes, Lines, Records . The file sytems which are used to store physical files are FAT12, FAT16, FAT32 , in which FAT number refers to the number of bits per table entry.

3) Logical files are organized as byte streams which can have fixed or variable size of records . The logical file system allows same system call interface to be used for different types of file systems, The logical cluster number is stored in the logical file system which is same as the logical file system address.

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