Operating Systems 2017F Lecture 18: Difference between revisions
| Line 13: | Line 13: | ||
What's in a filesystem <br> | What's in a filesystem <br> | ||
* data blocks <br> | * data blocks <br> | ||
* metadata blocks <br> | * metadata blocks, you need someway to find the blocks<br> | ||
<br> | <br> | ||
How do you organize metadata?<br> | How do you organize metadata?<br> | ||
Revision as of 18:18, 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, you need someway to find the 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