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cab2e8bdd3
Finished adding untested shm syscalls. Finished adding untested l4 send/recv helpers Everything compiles. Now going to fix lots of bugs ;-)
114 lines
2.3 KiB
C
114 lines
2.3 KiB
C
/*
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* The disk layout of our simple unix-like filesystem.
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*
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* Copyright (C) 2007, 2008 Bahadir Balban
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*/
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#ifndef __C0FS_LAYOUT_H__
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#define __C0FS_LAYOUT_H__
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#include <l4lib/types.h>
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#include <l4/lib/list.h>
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#include <l4/macros.h>
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#include <l4/config.h>
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#include INC_GLUE(memory.h)
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/*
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*
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* Filesystem layout:
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*
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* |---------------|
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* | Group 0 |
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* |---------------|
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* | Group 1 |
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* |---------------|
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* | ... |
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* |---------------|
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* | Group n |
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* |---------------|
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*
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*
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* Group layout:
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*
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* |---------------|
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* | Superblock |
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* |---------------|
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* | Inode table |
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* |---------------|
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* | Data blocks |
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* |---------------|
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*
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* or
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*
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* |---------------|
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* | Data blocks |
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* |---------------|
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*
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*/
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#define BLOCK_SIZE PAGE_SIZE
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#define BLOCK_BITS PAGE_BITS
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#define GROUP_SIZE SZ_8MB
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#define INODE_TABLE_SIZE ((GROUP_SIZE / BLOCK_SIZE) / 2)
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#define INODE_BITMAP_SIZE (INODE_TABLE_SIZE >> 5)
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struct sfs_superblock {
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u32 magic; /* Filesystem magic number */
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u64 fssize; /* Total size of filesystem */
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u32 total; /* To */
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u32 groupmap[]; /* Bitmap of all fs groups */
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};
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struct sfs_group_table {
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u32 total;
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u32 free;
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u32 groupmap[];
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};
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struct sfs_inode_table {
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u32 total;
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u32 free;
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u32 inodemap[INODE_BITMAP_SIZE];
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struct sfs_inode inode[INODE_TABLE_SIZE];
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};
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/*
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* The purpose of an inode:
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*
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* 1) Uniquely identify a file or a directory.
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* 2) Keep file/directory metadata.
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* 3) Provide access means to file blocks/directory contents.
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*/
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#define INODE_DIRECT_BLOCKS 5
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struct sfs_inode_blocks {
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int szidx; /* Direct array index size */
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unsigned long indirect;
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unsigned long indirect2;
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unsigned long indirect3;
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unsigned long direct[];
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};
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struct sfs_inode {
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u32 unum; /* Unit number this inode is in */
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u32 inum; /* Inode number */
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u32 mode; /* File permissions */
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u32 owner; /* File owner */
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u64 atime; /* Last access time */
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u64 mtime; /* Last content modification */
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u64 ctime; /* Last inode modification */
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u64 size; /* Size of contents */
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struct sfs_inode_blocks blocks;
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} __attribute__ ((__packed__));
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struct sfs_dentry {
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u32 inum; /* Inode number */
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u32 nlength; /* Name length */
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u8 name[]; /* Name string */
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} __attribute__ ((__packed__));
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void sfs_register_type(struct list_head *);
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#endif /* __C0FS_LAYOUT_H__ */
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