StupidOS/kernel/fs/xv6fs.inc

	;; File: xv6fs.inc
	;;
	;; > ┌──────────┬───────────┬───┬───┬───┬──────┬───┬──────┬──────┬───┬──────┬────┬───┬────┐
	;; > │Boot block│Super block│Log│...│Log│Inodes│...│Inodes│Bitmap│...│Bitmap│Data│...│Data│
	;; > └──────────┴───────────┴───┴───┴───┴──────┴───┴──────┴──────┴───┴──────┴────┴───┴────┘
	;;
	;; Usefull links:
	;; - <https://github.com/mit-pdos/xv6-riscv/blob/riscv/kernel/fs.h>
	;; - <xv6 book at https://pdos.csail.mit.edu/6.1810/2023/xv6/book-riscv-rev3.pdf>

	;; Constant: XV6FS_BSIZE
	;; xv6 Filesystem block size (1024)
XV6FS_BSIZE     = 1024
XV6FS_ROOTINO   = 1
XV6FS_MAGIC     = 0x10203040
XV6FS_NDIRECT   = 12
XV6FS_NINDIRECT = (XV6FS_BSIZE / 4)
XV6FS_MAXFILE   = (XV6FS_NDIRECT + XV6FS_NINDIRECT)
XV6FS_IPB       = (XV6FS_BSIZE / 64)
XV6FS_DIRSIZE   = 14 

	;; Struc: Xv6FS_Sb
struc Xv6FS_Sb {
	.magic      dd ?
	.size       dd ?
	.nblock     dd ?
	.ninodes    dd ?
	.nlog       dd ?
	.nlogstart  dd ?
	.inodestart dd ?
	.bmapstart  dd ?
}
DEFN Xv6FS_Sb

	;; Struc: Xv6FS_Inode
struc Xv6FS_Inode {
	.type  dw ?
	.major dw ?
	.minor dw ?
	.nlink dw ?
	.size  dd ?
	.addrs dd (XV6FS_NDIRECT + 1) dup(?)
}
DEFN Xv6FS_Inode

	;; Struc: Xv6FS_Dirent
struc Xv6FS_Dirent {
	.inum dw ?
	.name db XV6FS_DIRSIZE dup(?)
}

	; ------------------------------------------------------------------------

	;; Section: Implementation


szVfsXv6FSName db 'xv6FS', 0

vops_xv6fs:
	dd 0

vfs_xv6fs:
	dd szVfsXv6FSName
	dd 0
	dd vops_xv6fs

xv6fs_init:
	mov eax, vfs_xv6fs
	call vfs_register
	ret