ufs_fs.h

linux得一些常用命令,以及linux环境下的c编程

	__u32	fs_bshift;	/* ``lblkno'' calc of logical blkno */
	__u32	fs_fshift;	/* ``numfrags'' calc number of frags */
/* these are configuration parameters */
	__u32	fs_maxcontig;	/* max number of contiguous blks */
	__u32	fs_maxbpg;	/* max number of blks per cyl group */
/* these fields can be computed from the others */
	__u32	fs_fragshift;	/* block to frag shift */
	__u32	fs_fsbtodb;	/* fsbtodb and dbtofsb shift constant */
	__u32	fs_sbsize;	/* actual size of super block */
	__u32	fs_csmask;	/* csum block offset */
	__u32	fs_csshift;	/* csum block number */
	__u32	fs_nindir;	/* value of NINDIR */
	__u32	fs_inopb;	/* value of INOPB */
	__u32	fs_nspf;	/* value of NSPF */
/* yet another configuration parameter */
	__u32	fs_optim;	/* optimization preference, see below */
/* these fields are derived from the hardware */
	union {
		struct {
			__u32	fs_npsect;	/* # sectors/track including spares */
		} fs_sun;
		struct {
			__s32	fs_state;	/* file system state time stamp */
		} fs_sunx86;
	} fs_u1;
	__u32	fs_interleave;	/* hardware sector interleave */
	__u32	fs_trackskew;	/* sector 0 skew, per track */
/* a unique id for this filesystem (currently unused and unmaintained) */
/* In 4.3 Tahoe this space is used by fs_headswitch and fs_trkseek */
/* Neither of those fields is used in the Tahoe code right now but */
/* there could be problems if they are.                            */
	__u32	fs_id[2];	/* file system id */
/* sizes determined by number of cylinder groups and their sizes */
	__u32	fs_csaddr;	/* blk addr of cyl grp summary area */
	__u32	fs_cssize;	/* size of cyl grp summary area */
	__u32	fs_cgsize;	/* cylinder group size */
/* these fields are derived from the hardware */
	__u32	fs_ntrak;	/* tracks per cylinder */
	__u32	fs_nsect;	/* sectors per track */
	__u32	fs_spc;		/* sectors per cylinder */
/* this comes from the disk driver partitioning */
	__u32	fs_ncyl;	/* cylinders in file system */
/* these fields can be computed from the others */
	__u32	fs_cpg;		/* cylinders per group */
	__u32	fs_ipg;		/* inodes per group */
	__u32	fs_fpg;		/* blocks per group * fs_frag */
/* this data must be re-computed after crashes */
	struct ufs_csum fs_cstotal;	/* cylinder summary information */
/* these fields are cleared at mount time */
	__s8	fs_fmod;	/* super block modified flag */
	__s8	fs_clean;	/* file system is clean flag */
	__s8	fs_ronly;	/* mounted read-only flag */
	__s8	fs_flags;	/* currently unused flag */
	__s8	fs_fsmnt[UFS_MAXMNTLEN];	/* name mounted on */
/* these fields retain the current block allocation info */
	__u32	fs_cgrotor;	/* last cg searched */
	__u32	fs_csp[UFS_MAXCSBUFS];	/* list of fs_cs info buffers */
	__u32	fs_maxcluster;
	__u32	fs_cpc;		/* cyl per cycle in postbl */
	__u16	fs_opostbl[16][8];	/* old rotation block list head */	
	union {
		struct {
			__s32	fs_sparecon[53];/* reserved for future constants */
			__s32	fs_reclaim;
			__s32	fs_sparecon2[1];
			__s32	fs_state;	/* file system state time stamp */
			__u32	fs_qbmask[2];	/* ~usb_bmask */
			__u32	fs_qfmask[2];	/* ~usb_fmask */
		} fs_sun;
		struct {
			__s32	fs_sparecon[53];/* reserved for future constants */
			__s32	fs_reclaim;
			__s32	fs_sparecon2[1];
			__u32	fs_npsect;	/* # sectors/track including spares */
			__u32	fs_qbmask[2];	/* ~usb_bmask */
			__u32	fs_qfmask[2];	/* ~usb_fmask */
		} fs_sunx86;
		struct {
			__s32	fs_sparecon[50];/* reserved for future constants */
			__s32	fs_contigsumsize;/* size of cluster summary array */
			__s32	fs_maxsymlinklen;/* max length of an internal symlink */
			__s32	fs_inodefmt;	/* format of on-disk inodes */
			__u32	fs_maxfilesize[2];	/* max representable file size */
			__u32	fs_qbmask[2];	/* ~usb_bmask */
			__u32	fs_qfmask[2];	/* ~usb_fmask */
			__s32	fs_state;	/* file system state time stamp */
		} fs_44;
	} fs_u2;
	__s32	fs_postblformat;	/* format of positional layout tables */
	__s32	fs_nrpos;		/* number of rotational positions */
	__s32	fs_postbloff;		/* (__s16) rotation block list head */
	__s32	fs_rotbloff;		/* (__u8) blocks for each rotation */
	__s32	fs_magic;		/* magic number */
	__u8	fs_space[1];		/* list of blocks for each rotation */
};

/*
 * Preference for optimization.
 */
#define UFS_OPTTIME	0	/* minimize allocation time */
#define UFS_OPTSPACE	1	/* minimize disk fragmentation */

/*
 * Rotational layout table format types
 */
#define UFS_42POSTBLFMT		-1	/* 4.2BSD rotational table format */
#define UFS_DYNAMICPOSTBLFMT	1	/* dynamic rotational table format */

/*
 * Convert cylinder group to base address of its global summary info.
 */
#define fs_cs(indx) \
	u.ufs_sb.s_csp[(indx) >> uspi->s_csshift][(indx) & ~uspi->s_csmask]

/*
 * Cylinder group block for a file system.
 *
 * Writable fields in the cylinder group are protected by the associated
 * super block lock fs->fs_lock.
 */
#define	CG_MAGIC	0x090255
#define ufs_cg_chkmagic(sb, ucg) \
	(fs32_to_cpu((sb), (ucg)->cg_magic) == CG_MAGIC)

/*
 * size of this structure is 172 B
 */
struct	ufs_cylinder_group {
	__u32	cg_link;		/* linked list of cyl groups */
	__u32	cg_magic;		/* magic number */
	__u32	cg_time;		/* time last written */
	__u32	cg_cgx;			/* we are the cgx'th cylinder group */
	__u16	cg_ncyl;		/* number of cyl's this cg */
	__u16	cg_niblk;		/* number of inode blocks this cg */
	__u32	cg_ndblk;		/* number of data blocks this cg */
	struct	ufs_csum cg_cs;		/* cylinder summary information */
	__u32	cg_rotor;		/* position of last used block */
	__u32	cg_frotor;		/* position of last used frag */
	__u32	cg_irotor;		/* position of last used inode */
	__u32	cg_frsum[UFS_MAXFRAG];	/* counts of available frags */
	__u32	cg_btotoff;		/* (__u32) block totals per cylinder */
	__u32	cg_boff;		/* (short) free block positions */
	__u32	cg_iusedoff;		/* (char) used inode map */
	__u32	cg_freeoff;		/* (u_char) free block map */
	__u32	cg_nextfreeoff;		/* (u_char) next available space */
	union {
		struct {
			__u32	cg_clustersumoff;	/* (u_int32) counts of avail clusters */
			__u32	cg_clusteroff;		/* (u_int8) free cluster map */
			__u32	cg_nclusterblks;	/* number of clusters this cg */
			__u32	cg_sparecon[13];	/* reserved for future use */
		} cg_44;
		__u32	cg_sparecon[16];	/* reserved for future use */
	} cg_u;
	__u8	cg_space[1];		/* space for cylinder group maps */
/* actually longer */
};

/*
 * structure of an on-disk inode
 */
struct ufs_inode {
	__u16	ui_mode;		/*  0x0 */
	__u16	ui_nlink;		/*  0x2 */
	union {
		struct {
			__u16	ui_suid;	/*  0x4 */
			__u16	ui_sgid;	/*  0x6 */
		} oldids;
		__u32	ui_inumber;		/*  0x4 lsf: inode number */
		__u32	ui_author;		/*  0x4 GNU HURD: author */
	} ui_u1;
	__u64	ui_size;		/*  0x8 */
	struct ufs_timeval ui_atime;	/* 0x10 access */
	struct ufs_timeval ui_mtime;	/* 0x18 modification */
	struct ufs_timeval ui_ctime;	/* 0x20 creation */
	union {
		struct {
			__u32	ui_db[UFS_NDADDR];/* 0x28 data blocks */
			__u32	ui_ib[UFS_NINDIR];/* 0x58 indirect blocks */
		} ui_addr;
		__u8	ui_symlink[4*(UFS_NDADDR+UFS_NINDIR)];/* 0x28 fast symlink */
	} ui_u2;
	__u32	ui_flags;		/* 0x64 immutable, append-only... */
	__u32	ui_blocks;		/* 0x68 blocks in use */
	__u32	ui_gen;			/* 0x6c like ext2 i_version, for NFS support */
	union {
		struct {
			__u32	ui_shadow;	/* 0x70 shadow inode with security data */
			__u32	ui_uid;		/* 0x74 long EFT version of uid */
			__u32	ui_gid;		/* 0x78 long EFT version of gid */
			__u32	ui_oeftflag;	/* 0x7c reserved */
		} ui_sun;
		struct {
			__u32	ui_uid;		/* 0x70 File owner */
			__u32	ui_gid;		/* 0x74 File group */
			__s32	ui_spare[2];	/* 0x78 reserved */
		} ui_44;
		struct {
			__u32	ui_uid;		/* 0x70 */
			__u32	ui_gid;		/* 0x74 */
			__u16	ui_modeh;	/* 0x78 mode high bits */
			__u16	ui_spare;	/* 0x7A unused */
			__u32	ui_trans;	/* 0x7c filesystem translator */
		} ui_hurd;
	} ui_u3;
};

/* FreeBSD has these in sys/stat.h */
/* ui_flags that can be set by a file owner */
#define UFS_UF_SETTABLE   0x0000ffff
#define UFS_UF_NODUMP     0x00000001  /* do not dump */
#define UFS_UF_IMMUTABLE  0x00000002  /* immutable (can't "change") */
#define UFS_UF_APPEND     0x00000004  /* append-only */
#define UFS_UF_OPAQUE     0x00000008  /* directory is opaque (unionfs) */
#define UFS_UF_NOUNLINK   0x00000010  /* can't be removed or renamed */
/* ui_flags that only root can set */
#define UFS_SF_SETTABLE   0xffff0000
#define UFS_SF_ARCHIVED   0x00010000  /* archived */
#define UFS_SF_IMMUTABLE  0x00020000  /* immutable (can't "change") */
#define UFS_SF_APPEND     0x00040000  /* append-only */
#define UFS_SF_NOUNLINK   0x00100000  /* can't be removed or renamed */

#ifdef __KERNEL__

/* balloc.c */
extern void ufs_free_fragments (struct inode *, unsigned, unsigned);
extern void ufs_free_blocks (struct inode *, unsigned, unsigned);
extern unsigned ufs_new_fragments (struct inode *, u32 *, unsigned, unsigned, unsigned, int *);

/* cylinder.c */
extern struct ufs_cg_private_info * ufs_load_cylinder (struct super_block *, unsigned);
extern void ufs_put_cylinder (struct super_block *, unsigned);

/* dir.c */
extern struct inode_operations ufs_dir_inode_operations;
extern int ufs_check_dir_entry (const char *, struct inode *, struct ufs_dir_entry *, struct buffer_head *, unsigned long);
extern int ufs_add_link (struct dentry *, struct inode *);
extern ino_t ufs_inode_by_name(struct inode *, struct dentry *);
extern int ufs_make_empty(struct inode *, struct inode *);
extern struct ufs_dir_entry * ufs_find_entry (struct dentry *, struct buffer_head **);
extern int ufs_delete_entry (struct inode *, struct ufs_dir_entry *, struct buffer_head *);
extern int ufs_empty_dir (struct inode *);
extern struct ufs_dir_entry * ufs_dotdot (struct inode *, struct buffer_head **);
extern void ufs_set_link(struct inode *, struct ufs_dir_entry *, struct buffer_head *, struct inode *);

/* file.c */
extern struct inode_operations ufs_file_inode_operations;
extern struct file_operations ufs_file_operations;

extern struct address_space_operations ufs_aops;

/* ialloc.c */
extern void ufs_free_inode (struct inode *inode);
extern struct inode * ufs_new_inode (const struct inode *, int);

/* inode.c */
extern int ufs_frag_map (struct inode *, int);
extern void ufs_read_inode (struct inode *);
extern void ufs_put_inode (struct inode *);
extern void ufs_write_inode (struct inode *, int);
extern int ufs_sync_inode (struct inode *);
extern void ufs_delete_inode (struct inode *);
extern struct buffer_head * ufs_getfrag (struct inode *, unsigned, int, int *);
extern struct buffer_head * ufs_bread (struct inode *, unsigned, int, int *);

/* namei.c */
extern struct file_operations ufs_dir_operations;
        
/* super.c */
extern struct file_system_type ufs_fs_type;
extern void ufs_warning (struct super_block *, const char *, const char *, ...) __attribute__ ((format (printf, 3, 4)));
extern void ufs_error (struct super_block *, const char *, const char *, ...) __attribute__ ((format (printf, 3, 4)));
extern void ufs_panic (struct super_block *, const char *, const char *, ...) __attribute__ ((format (printf, 3, 4)));
extern void ufs_write_super (struct super_block *);

/* symlink.c */
extern struct inode_operations ufs_fast_symlink_inode_operations;

/* truncate.c */
extern void ufs_truncate (struct inode *);

#endif	/* __KERNEL__ */

#endif /* __LINUX_UFS_FS_H */