File Systems: Difference between revisions
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=== Rolling your own === |
=== Rolling your own === |
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There are many different kinds of filesystems around, from the well-known to the more obscure ones. The most unfortunate thing about filesystems is that every hobbyist OS programmer thinks that the filesystem they design is the ultimate technology, when in reality it's usually just a copy of FAT with a change here and there, perhaps because it is one of the easiest to implement. The world doesn't need another FAT-like filesystem. Investigate all the possibilities before you decide to roll your own. |
There are many different kinds of filesystems around, from the well-known to the more obscure ones. The most unfortunate thing about filesystems is that every hobbyist OS programmer thinks that the filesystem they design is the ultimate technology, when in reality it's usually just a copy of FAT with a change here and there, perhaps because it is one of the easiest to implement. The world doesn't need another FAT-like filesystem. Investigate all the possibilities before you decide to roll your own. |
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If despite of this warning you decide to create your own file system, then you should start that by implementing a [[FUSE]] driver for it. This gives the advantage that you can mount your file system image as any other storage device, and you can lists its contents, create new files and directories etc. with standard tools. FUSE is available for Linux, MacOSX and Windows as well. |
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==== Guidelines if you do decide to roll your own ==== |
==== Guidelines if you do decide to roll your own ==== |
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** Data area. Files will be stored here. |
** Data area. Files will be stored here. |
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* Create a program to read and write disk images with your filesystem. Parts of this will be portable into the fs driver. |
* Create a program to read and write disk images with your filesystem. Parts of this will be portable into the fs driver. |
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* It is strongly recommended to create a [[FUSE]] driver for your file system. |
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* Implement the fs into your OS. |
* Implement the fs into your OS. |
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