Virtual File System #10

apio · 2022-10-09T19:23:01Z

apio commented

2022-10-09 19:23:01 +00:00

This is still a work in progress, but is the beginnings of a VFS in the kernel, which will enable passing files to userspace, mounting several filesystems (and pseudo-filesystems) and more...

apio added the

enhancement

label 2022-10-09 19:23:01 +00:00

apio self-assigned this 2022-10-09 19:23:01 +00:00

apio added 3 commits 2022-10-09 19:23:01 +00:00

The beginnings of a VFS implementation!! f3d7e220ac

more vfs stuff b38c52f8c7

VFS: be more verbose 8158ddc94f

apio added 1 commit 2022-10-09 19:30:45 +00:00

VFS: Use 64-bit numbers in read() 2be70d0bc1

There is no need for any kind of 32-bit compatibility.

apio added 1 commit 2022-10-10 16:46:42 +00:00

VFS: Implement resolve_path and form the initial ramdisk's VFS properly bbe7c6e658

Finally, resolve_path: a function which takes a path (/etc/fstab for example), and walks the VFS:
In this case, it would start with the root FS node, and ask it: "do you have a directory/file named etc?"
The node could say 'yes', 'no', or 'i'm not a directory, I'm a file' (should not be the case for the VFS root, but for the other ones it could be)
If it says yes, we continue and ask the child if it has a file named fstab. Etc...

apio added 1 commit 2022-10-10 17:00:30 +00:00

Basic FDs 63b2de4e3c

apio added 1 commit 2022-10-10 18:21:53 +00:00

Kernel, libc, userspace: Implement file descriptors da2ede3450

Kernel: Implement a descriptor struct which stores the opened node and read offset, and give each task 8 of those.
Implement three syscalls: sys_read, sys_open and sys_close (sys_write still writes to the console instead of using a fd, for now)
Implement three new errors: ENOENT, EBADF and EMFILE.

libc: Implement the new errors, and the new syscalls in syscall().
Also fix _RETURN_WITH_ERRNO() to set errno correctly, which was making strerror() return null, thus crashing perror().

userspace: make init demonstrate the new file API.

apio commented

2022-10-10 18:25:17 +00:00

This needs:

libc wrappers
adding the C FILE* API to libc with this
more actions
more VFS functionality

But I think this is functional enough that it can be merged.

This needs: - libc wrappers - adding the C FILE* API to libc with this - more actions - more VFS functionality But I think this is functional enough that it can be merged.

apio changed title from ~~WIP: Virtual File System~~ to Virtual File System

2022-10-10 18:25:25 +00:00

apio merged commit 1b84c443fe into main

2022-10-10 18:25:43 +00:00

apio deleted branch vfs

2022-10-10 18:25:43 +00:00

apio referenced this issue from a commit

2022-10-10 18:25:43 +00:00

Merge branch VFS into main

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