nuclear@88: #ifndef FS_H_
nuclear@88: #define FS_H_
nuclear@88: 
nuclear@90: #include <inttypes.h>
nuclear@90: 
nuclear@96: #define MAGIC		0xccf5ccf5
nuclear@96: #define FS_VER		1
nuclear@96: #define BLKSZ		1024
nuclear@96: 
nuclear@96: #define NAME_MAX	27	/* +1 termin. +4 ino = 32 per dirent */
nuclear@96: #define PATH_MAX	256
nuclear@90: 
nuclear@90: #define SECT_TO_BLK(x)	((x) / (BLKSZ / 512))
nuclear@90: 
nuclear@91: #define DEVNO(maj, min)	((((maj) & 0xff) << 8) | ((min) & 0xff))
nuclear@90: #define DEV_MAJOR(dev)	(((dev) >> 8) & 0xff)
nuclear@90: #define DEV_MINOR(dev)	((dev) & 0xff)
nuclear@90: 
nuclear@90: 
nuclear@90: typedef uint32_t dev_t;
nuclear@90: typedef uint32_t blkid;
nuclear@90: 
nuclear@94: 
nuclear@94: /* 20 direct blocks + 10 attributes + 2 indirect = 128 bytes per inode */
nuclear@94: #define NDIRBLK	20
nuclear@94: struct inode {
nuclear@94: 	int ino;
nuclear@94: 	int uid, gid, mode;
nuclear@94: 	int nlink;
nuclear@94: 	dev_t dev;
nuclear@94: 	uint32_t atime, ctime, mtime;
nuclear@94: 	uint32_t size;
nuclear@94: 	blkid blk[NDIRBLK];	/* direct blocks */
nuclear@94: 	blkid ind;			/* indirect */
nuclear@94: 	blkid dind;			/* double-indirect */
nuclear@94: } __attribute__((packed));
nuclear@94: 
nuclear@96: struct dir_entry {
nuclear@96: 	int ino;
nuclear@96: 	char name[NAME_MAX + 1];
nuclear@96: } __attribute__((packed));
nuclear@94: 
nuclear@90: struct superblock {
nuclear@90: 	uint32_t magic;	/* magic number */
nuclear@90: 	int ver;		/* filesystem version */
nuclear@90: 	int blksize;	/* only BLKSZ supported at the moment */
nuclear@90: 
nuclear@90: 	/* total number of blocks */
nuclear@90: 	unsigned int num_blocks;
nuclear@95: 	/* total number of inodes */
nuclear@95: 	unsigned int num_inodes;
nuclear@95: 
nuclear@90: 	/* inode allocation bitmap start and count */
nuclear@90: 	blkid ibm_start;
nuclear@90: 	unsigned int ibm_count;
nuclear@90: 	/* inode table start and count */
nuclear@90: 	blkid itbl_start;
nuclear@90: 	unsigned int itbl_count;
nuclear@93: 	/* block allocation bitmap start and count */
nuclear@93: 	blkid bm_start;
nuclear@93: 	unsigned int bm_count;
nuclear@90: 
nuclear@94: 	int root_ino;	/* root direcotry inode number */
nuclear@90: 
nuclear@90: 	/* the following are valid only at runtime, ignored on disk */
nuclear@93: 	uint32_t *ibm;	/* in-memory inode bitmap */
nuclear@93: 	uint32_t *bm;	/* in-memory block bitmap */
nuclear@94: 	struct inode *root;	/* in-memory root inode */
nuclear@90: 
nuclear@90: } __attribute__((packed));
nuclear@90: 
nuclear@90: 
nuclear@90: 
nuclear@93: struct filesys {
nuclear@93: 	struct block_device *bdev;
nuclear@93: 
nuclear@93: 	struct superblock *sb;
nuclear@93: 
nuclear@93: 	struct filesys *next;
nuclear@93: };
nuclear@93: 
nuclear@93: /* defined in fs.c */
nuclear@93: int openfs(struct filesys *fs, dev_t dev);
nuclear@96: int mkfs(struct filesys *fs, dev_t dev);
nuclear@94: void closefs(struct filesys *fs);
nuclear@93: int find_inode(const char *path);
nuclear@93: 
nuclear@93: /* defined in fs_sys.c */
nuclear@90: int sys_mount(char *mntpt, char *devname, unsigned int flags);
nuclear@90: int sys_umount(char *devname);
nuclear@90: 
nuclear@90: int sys_open(char *pathname, int flags, unsigned int mode);
nuclear@90: int sys_close(int fd);
nuclear@90: 
nuclear@90: int sys_read(int fd, void *buf, int sz);
nuclear@90: int sys_write(int fd, void *buf, int sz);
nuclear@90: long sys_lseek(int fd, long offs, int from);
nuclear@90: 
nuclear@89: 
nuclear@88: #endif	/* FS_H_ */