Post on 14-Dec-2015
Operating Systems
Operating Systems - Winter 2011
Chapter 5 – File Systems
Vrije Universiteit Amsterdam
Chap 5 - OverviewOperating Systems 2011
Vrije Universiteit Amsterdam Slide 1
• Files
• Directories
• File system implementation
• Security
• MINIX filesystem
File SystemsOperating Systems 2011
Vrije Universiteit Amsterdam Slide 2
File OrganizationOperating Systems 2011
Vrije Universiteit Amsterdam Slide 3
File Attributes
Vrije Universiteit Amsterdam Slide 4
Operating Systems 2011
Directories
Vrije Universiteit Amsterdam Slide 5
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Directories – Pathnames
Vrije Universiteit Amsterdam Slide 6
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File System Design
Vrije Universiteit Amsterdam Slide 7
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File Storage: Disk Layout
Vrije Universiteit Amsterdam Slide 8
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File Storage: Linked Lists
Vrije Universiteit Amsterdam Slide 9
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File Storage: File Allocation Table
Vrije Universiteit Amsterdam Slide 10
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File Storage – Inodes
Vrije Universiteit Amsterdam Slide 11
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Directory Structure – Windows 98
Vrije Universiteit Amsterdam Slide 12
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File Storage – UNIX
Vrije Universiteit Amsterdam Slide 13
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File Storage – Name Resolution
Vrije Universiteit Amsterdam Slide 14
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Disk Space Management (1/2)
Vrije Universiteit Amsterdam Slide 15
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Disk Space Management (2/2)
Vrije Universiteit Amsterdam Slide 16
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File System Reliability
Vrije Universiteit Amsterdam Slide 17
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File System Consistency (1/2)
Vrije Universiteit Amsterdam Slide 18
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File System Consistency (2/2)
Vrije Universiteit Amsterdam Slide 19
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Buffer Cache
Vrije Universiteit Amsterdam Slide 20
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Log-Structured File Systems
Vrije Universiteit Amsterdam Slide 21
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Security
Vrije Universiteit Amsterdam Slide 22
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Mechanism vs. Policy
Vrije Universiteit Amsterdam Slide 23
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Authentication
Vrije Universiteit Amsterdam Slide 24
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Protection Domains (1/2)
Vrije Universiteit Amsterdam Slide 25
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Protection Domains (2/2)
Vrije Universiteit Amsterdam Slide 26
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Changing Domains
Vrije Universiteit Amsterdam Slide 27
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Changing Domains – Example
Vrije Universiteit Amsterdam Slide 28
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Impl. the Access Matrix (1/2)
Vrije Universiteit Amsterdam Slide 29
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Impl. the Access Matrix (2/2)
Vrije Universiteit Amsterdam Slide 30
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MINIX Filesystem
Vrije Universiteit Amsterdam Slide 31
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MINIX Superblock (1/2)
Vrije Universiteit Amsterdam Slide 32
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MINIX Superblock (2/2)
Vrije Universiteit Amsterdam Slide 33
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Inodes (1/2)
Vrije Universiteit Amsterdam Slide 34
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Inodes (2/2)
Vrije Universiteit Amsterdam Slide 35
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Block Cache (1/2)
Vrije Universiteit Amsterdam Slide 36
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Block Cache (2/2)
Vrije Universiteit Amsterdam Slide 37
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Mount Files-Implementation (1/2)
Vrije Universiteit Amsterdam Slide 38
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Mount Files-Implementation (2/2)
Vrije Universiteit Amsterdam Slide 39
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File Descriptors
Vrije Universiteit Amsterdam Slide 40
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Special Cases
Vrije Universiteit Amsterdam Slide 41
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File System Tables
Vrije Universiteit Amsterdam Slide 42
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File System Overview
Vrije Universiteit Amsterdam Slide 43
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Buffer Cache – Get a Block
Vrije Universiteit Amsterdam Slide 44
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Getting a Block (1/2)
Vrije Universiteit Amsterdam Slide 45
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934
Getting a Block (2/2)
Vrije Universiteit Amsterdam Slide 46
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934
935
Buffer Cache – Return a Block
Vrije Universiteit Amsterdam Slide 47
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Returning a Block
Vrije Universiteit Amsterdam Slide 48
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935
936
Inode Management
Vrije Universiteit Amsterdam Slide 49
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Allocating an Inode
Vrije Universiteit Amsterdam Slide 50
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942
943
Reading/Writing an Inode
Vrije Universiteit Amsterdam Slide 51
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945
Superblock Management
Vrije Universiteit Amsterdam Slide 52
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File Manipulation
Vrije Universiteit Amsterdam Slide 53
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Getting the Block Number
Vrije Universiteit Amsterdam Slide 54
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Searching the Inode
Vrije Universiteit Amsterdam Slide 55
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978
979
Reading/Writing File Block
Vrije Universiteit Amsterdam Slide 56
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Doing the I/O (1/2)
Vrije Universiteit Amsterdam Slide 57
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977
978
Doing the I/O (2/2)
Vrije Universiteit Amsterdam Slide 58
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978
Getting A File By Name
Vrije Universiteit Amsterdam Slide 59
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Parsing a Pathname (1/2)
Vrije Universiteit Amsterdam Slide 60
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996
Parsing a Pathname (2/2)
Vrije Universiteit Amsterdam Slide 61
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996
997
Mounting a Filesystem
Vrije Universiteit Amsterdam Slide 62
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Questions?
Vrije Universiteit Amsterdam Slide 63
Operating Systems 2011