Y

File Systems Chapter 6 6.1 Files 6.2 Directories 6.3 File system implementation 6.4 Example file systems

Long-term Information Storage ,[object Object],[object Object],[object Object]

Logische Struktur von Dateien ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Name Straße PLZ Ort Id-Nr Name Straße PLZ Ort Id-Nr

Dateizugriffsorganisation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Datei: Verwalteter Verbund aus Daten ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

File Attributes ,[object Object]

Datei: Extern gespeicherte Datensammlung ,[object Object],[object Object],[object Object],[object Object],öffnen schließen positionieren lesen schreiben Attribute schreiben Erzeugen Löschen Attribute lesen Länge ändern Inhaltszugriffe Datei als Ganzes und Nicht-Inhalts- attribute zugreifen

An Example Program Using File System Calls (1/2)

An Example Program Using File System Calls (2/2)

Directories Single-Level Directory Systems ,[object Object],[object Object],[object Object]

Two-level Directory Systems ,[object Object]

Hierarchical Directory Systems ,[object Object]

Directory Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

File System Implementation ,[object Object]

Datei-Speicherung ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Implementing Files (1) ,[object Object],[object Object]

Implementing Files (2) ,[object Object]

Implementing Files (3) ,[object Object],+ Verfolgen der Verweisliste zum Positionieren ohne Plattenzugriffe möglich, da File Allocation Table (FAT) im Arbeitspeicher - 1 FAT für alle Dateien einer Platte ist sehr groß und nimmt viel Arbeitsspeicher weg.

Implementing Files (4) ,[object Object],[object Object],[object Object],[object Object]

Implementing Directories (1) ,[object Object],[object Object],[object Object],[object Object]

Implementing Directories (2) ,[object Object],[object Object],[object Object]

Shared Files (1) ,[object Object]

Shared Files (2) ,[object Object],[object Object],[object Object]

Disk Space Management (1) ,[object Object],[object Object],[object Object],Block size

Disk Space Management (2) ,[object Object],[object Object]

Disk Space Management (4) ,[object Object]

File System Reliability (1) ,[object Object],[object Object],[object Object],[object Object],File that has not changed

File System Reliability (2) ,[object Object]

File System Reliability (3) ,[object Object],[object Object],[object Object],[object Object],[object Object]

File System Performance (1) ,[object Object],Strategie-Zeiger (z.B. LRU) Hash-Kollisionsauflösungsliste

File System Performance (2) ,[object Object],[object Object],[object Object]

Log-Structured File Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example File Systems CD-ROM File Systems ,[object Object]

The MS-DOS File System (1) ,[object Object]

The MS-DOS File System (2) ,[object Object],[object Object]

The Windows 98 File System (1) ,[object Object],Bytes

The Windows 98 File System (2) ,[object Object],Bytes Checksum

The Windows 98 File System (3) ,[object Object]

The UNIX V7 File System (1) ,[object Object]

Y

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