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https://github.com/drasko/codezero.git
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d6d97876bb
Factored out mapping of the physical page as the final generic code after all fault-specific handling is done. Fixed the error that zero page didn't have an owner (devzero). Fixed the error that struct dirent did not have the record length field as u16 as expected by userspace.
98 lines
2.7 KiB
C
98 lines
2.7 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 __MEMFS_LAYOUT_H__
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#define __MEMFS_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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#include <memcache/memcache.h>
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#include <lib/idpool.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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* | Superblock |
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* |---------------|
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*
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* Superblock layout:
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*
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* |---------------|
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* | inode cache |
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* |---------------|
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* | dentry cache |
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* |---------------|
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* | block cache |
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* |---------------|
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*
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*/
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/*
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* These fixed filesystem limits make it much easier to implement
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* filesystem space allocation.
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*/
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#define MEMFS_TOTAL_SIZE SZ_8MB
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#define MEMFS_TOTAL_INODES 128
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#define MEMFS_TOTAL_BLOCKS 2000
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#define MEMFS_FMAX_BLOCKS 5
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#define MEMFS_BLOCK_SIZE PAGE_SIZE
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#define MEMFS_MAGIC 0xB
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#define MEMFS_NAME "memfs"
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#define MEMFS_NAME_SIZE 8
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struct memfs_inode {
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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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void *block[5]; /* Number of blocks */
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};
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struct memfs_superblock {
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u32 magic; /* Filesystem magic number */
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char name[8];
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u32 blocksize; /* Filesystem block size */
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u64 fmaxblocks; /* Maximum number of blocks per file */
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u64 fssize; /* Total size of filesystem */
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unsigned long root_vnum; /* The root vnum of this superblock */
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struct list_head inode_cache_list; /* Chain of alloc caches */
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struct list_head block_cache_list; /* Chain of alloc caches */
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struct id_pool *ipool; /* Index pool for inodes */
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struct id_pool *bpool; /* Index pool for blocks */
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struct memfs_inode *inode[MEMFS_TOTAL_INODES]; /* Table of inodes */
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void *block[MEMFS_TOTAL_BLOCKS]; /* Table of fs blocks */
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} __attribute__ ((__packed__));
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#define MEMFS_DNAME_MAX 32
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struct memfs_dentry {
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u32 inum; /* Inode number */
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u32 offset; /* Dentry offset in its buffer */
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u16 rlength; /* Record length */
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u8 name[MEMFS_DNAME_MAX]; /* Name string */
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};
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extern struct vnode_ops memfs_vnode_operations;
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extern struct superblock_ops memfs_superblock_operations;
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extern struct file_ops memfs_file_operations;
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int memfs_format_filesystem(void *buffer);
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struct memfs_inode *memfs_create_inode(struct memfs_superblock *sb);
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void memfs_register_fstype(struct list_head *);
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struct superblock *memfs_get_superblock(void *block);
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int memfs_generate_superblock(void *block);
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void *memfs_alloc_block(struct memfs_superblock *sb);
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int memfs_free_block(struct memfs_superblock *sb, void *block);
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#endif /* __MEMFS_LAYOUT_H__ */
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