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Ch12 OS

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The document discusses file system implementation and structure. It covers topics like directory implementation using linear lists and hash tables, different allocation methods like contiguous, linked and indexed allocation, free space management using bit vectors and linked lists, improving efficiency through caching, and recovery methods like consistency checking and log-structured file systems. It also provides an overview of the Sun Network File System (NFS) including its architecture, mount protocol, and remote operations.

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Chapter 12: File System Implementation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
File-System Structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Layered File System
A Typical File Control Block
In-Memory File System Structures ,[object Object],[object Object],[object Object]
In-Memory File System Structures
Virtual File Systems ,[object Object],[object Object],[object Object]
Schematic View of Virtual File System
Directory Implementation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Allocation Methods ,[object Object],[object Object],[object Object],[object Object]
Contiguous Allocation ,[object Object],[object Object],[object Object],[object Object],[object Object]
Contiguous Allocation of Disk Space
Extent-Based Systems ,[object Object],[object Object],[object Object]
Linked Allocation ,[object Object],pointer block =
Linked Allocation (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],LA/511 Q R
Linked Allocation
File-Allocation Table
Indexed Allocation ,[object Object],[object Object],index table
Example of Indexed Allocation
Indexed Allocation (Cont.) ,[object Object],[object Object],[object Object],[object Object],LA/512 Q R Q = displacement into index table R = displacement into block
Indexed Allocation – Mapping (Cont.) ,[object Object],[object Object],LA / (512 x 511) Q 1 R 1 ,[object Object],[object Object],R 1 / 512 Q 2 R 2 ,[object Object],[object Object]
Indexed Allocation – Mapping (Cont.) ,[object Object],LA / (512 x 512) Q 1 R 1 ,[object Object],[object Object],R 1 / 512 Q 2 R 2 ,[object Object],[object Object]
Indexed Allocation – Mapping (Cont.)  outer-index index table file
Combined Scheme: UNIX (4K bytes per block)
Free-Space Management ,[object Object],… 0 1 2 n-1 bit[ i ] = ο€Άο€·ο€Έ 0 οƒž block[ i ] free 1 οƒž block[ i ] occupied Block number calculation (number of bits per word) * (number of 0-value words) + offset of first 1 bit
Free-Space Management (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Free-Space Management (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Linked Free Space List on Disk
Efficiency and Performance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Various Disk-Caching Locations
Page Cache ,[object Object],[object Object],[object Object],[object Object]
I/O Without a Unified Buffer Cache
Unified Buffer Cache ,[object Object]
I/O Using a Unified Buffer Cache
Recovery ,[object Object],[object Object],[object Object]
Log Structured File Systems ,[object Object],[object Object],[object Object],[object Object]
The Sun Network File System (NFS) ,[object Object],[object Object]
NFS (Cont.) ,[object Object],[object Object],[object Object],[object Object]
NFS (Cont.) ,[object Object],[object Object],[object Object]
Three Independent File Systems
Mounting in NFS Mounts Cascading mounts
NFS Mount Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
NFS Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Three Major Layers of NFS Architecture ,[object Object],[object Object],[object Object],[object Object],[object Object]
Schematic View of NFS Architecture
NFS Path-Name Translation ,[object Object],[object Object]
NFS Remote Operations ,[object Object],[object Object],[object Object],[object Object],[object Object]

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