Operating Systems 2017F Lecture 18: Difference between revisions
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* data blocks <br> | * data blocks <br> | ||
* metadata blocks <br> | * metadata blocks <br> | ||
* | <br> | ||
How do you organize metadata?<br> | |||
<br> | |||
First identify basic characteristics of the filesystem <br> | |||
<br> | |||
You need a "superblock" which is a "summary" block that tells you about everything else<br> | |||
<br> | |||
Normally the superblock is the first block of the filesystem <br> | |||
<br> | |||
In the superblock <br> | |||
* Type of filesystem <br> | |||
* Size of the filesystem <br> | |||
* How the filesystem is organized <br> | |||
* Where can I find the rest of the metadata <br> | |||
Revision as of 18:16, 16 November 2017
Additional Notes
Lec 18
- More on filesystems
- How can you recover a fs and how do you delete a file?
A filesystem is a:
- Persistent data structure
- Stored in fixed size blocks (at least 512 bytes in size)
- Maps hierarchical filenames to file contents
- Has metadata about files somehow
What's in a filesystem
- data blocks
- metadata blocks
How do you organize metadata?
First identify basic characteristics of the filesystem
You need a "superblock" which is a "summary" block that tells you about everything else
Normally the superblock is the first block of the filesystem
In the superblock
- Type of filesystem
- Size of the filesystem
- How the filesystem is organized
- Where can I find the rest of the metadata