66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
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/*
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Copyright (C) 2016-2019 The University of Notre Dame
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This software is distributed under the GNU General Public License.
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See the file LICENSE for details.
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*/
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#ifndef DISKFS_H
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#define DISKFS_H
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#include "kernel/types.h"
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#define DISKFS_MAGIC 0xabcd4321
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#define DISKFS_BLOCK_SIZE 4096
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#define DISKFS_DIRECT_POINTERS 6
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#define DISKFS_INODES_PER_BLOCK (DISKFS_BLOCK_SIZE/sizeof(struct diskfs_inode))
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#define DISKFS_ITEMS_PER_BLOCK (DISKFS_BLOCK_SIZE/sizeof(struct diskfs_item))
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#define DISKFS_POINTERS_PER_BLOCK (DISKFS_BLOCK_SIZE/sizeof(uint32_t))
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struct diskfs_superblock {
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uint32_t magic;
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uint32_t block_size;
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uint32_t inode_start;
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uint32_t inode_blocks;
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uint32_t bitmap_start;
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uint32_t bitmap_blocks;
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uint32_t data_start;
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uint32_t data_blocks;
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};
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struct diskfs_inode {
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uint32_t inuse; // reserve for broader use.
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uint32_t size;
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uint32_t direct[DISKFS_DIRECT_POINTERS];
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uint32_t indirect;
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};
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#define DISKFS_ITEM_BLANK 0
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#define DISKFS_ITEM_FILE 1
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#define DISKFS_ITEM_DIR 2
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/* Maximum name length chosen so that diskfs_item is 32 bytes. */
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#define DISKFS_NAME_MAX 26
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#pragma pack(1)
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struct diskfs_item {
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uint32_t inumber;
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uint8_t type;
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uint8_t name_length;
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char name[DISKFS_NAME_MAX];
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};
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#pragma pack()
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struct diskfs_block {
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union {
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struct diskfs_superblock superblock;
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struct diskfs_inode inodes[DISKFS_INODES_PER_BLOCK];
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struct diskfs_item items[DISKFS_ITEMS_PER_BLOCK];
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uint32_t pointers[DISKFS_POINTERS_PER_BLOCK];
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char data[DISKFS_BLOCK_SIZE];
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};
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};
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int diskfs_init(void);
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#endif
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