Questions about file handling

[brain]

Here's how I do it, there are multiple drivers that implement FS_FileSystem structs and call attach_filesystem to add them to the list.

http://brainbox.cc/repository/trunk/six ... lesystem.c

you can also see the related header file:

http://brainbox.cc/repository/trunk/six ... lesystem.h

[tobbebia]

Don't mix volumes with mount table, they can be isolated.

Think about this, you have a list of volume objects, which can do this thing:
FILE_NODE file;
volume->open(&file, "/abc.txt");

Now, the mount mechanism is merely hash mapping.

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vfs_mount_add("/", vol[0]);
vfs_mount_add("/foo/", vol[1]);

When open a file

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vfs_open(/foo/abc.txt");

This resolve into vol[1] and pass "/abc.txt" to it.

But what if I do readdir on "/". Then it wont list foo as a dir.

[bluemoon]

One way to workaround that is to enforce a directory present before mounting. Just like any unix.

ps. I see nothing wrong by not showing /foo if it does not exist on the volume. It's just a metter of policy and user experience.

[tobbebia]

One way to workaround that is to enforce a directory present before mounting. Just like any unix.

ps. I see nothing wrong by not showing /foo if it does not exist on the volume. It's just a metter of policy and user experience.

Thanks for your informing replies! As I'm not a very experienced linux user I didn't know about that. So basically I should make an initrd filesystem and create those folder: "/dev, /dev/hdd0, /dev/usb" etc?