vnode.h

来自「基于组件方式开发操作系统的OSKIT源代码」· C头文件 代码 · 共 568 行 · 第 1/2 页

	struct vnode *vp;
{
	simple_lock(&vp->v_interlock);
	vp->v_holdcnt--;
	if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) &&
	    vp->v_holdcnt == 0 && vp->v_usecount == 0) {
		simple_lock(&vnode_free_list_slock);
		TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist);
		TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
		simple_unlock(&vnode_free_list_slock);
	}
	simple_unlock(&vp->v_interlock);
}

/*
 * increase buf or page ref
 */
static __inline void
vhold(vp)
	struct vnode *vp;
{
	simple_lock(&vp->v_interlock);
	if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) &&
	    vp->v_holdcnt == 0 && vp->v_usecount == 0) {
		simple_lock(&vnode_free_list_slock);
		TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
		TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist);
		simple_unlock(&vnode_free_list_slock);
	}
	vp->v_holdcnt++;
	simple_unlock(&vp->v_interlock);
}

/*
 * increase reference
 */
static __inline void
vref(vp)
	struct vnode *vp;
{
	simple_lock(&vp->v_interlock);
	vp->v_usecount++;
	simple_unlock(&vp->v_interlock);
}
#endif /* DIAGNOSTIC */

#define	NULLVP	((struct vnode *)NULL)

/*
 * Global vnode data.
 */
extern	struct vnode *rootvnode;	/* root (i.e. "/") vnode */
extern	int desiredvnodes;		/* number of vnodes desired */
extern	long numvnodes;			/* current number of vnodes */
extern	time_t syncdelay;		/* max time to delay syncing data */
extern	time_t filedelay;		/* time to delay syncing files */
extern	time_t dirdelay;		/* time to delay syncing directories */
extern	time_t metadelay;		/* time to delay syncing metadata */
extern	struct vattr va_null;		/* predefined null vattr structure */

/*
 * Macro/function to check for client cache inconsistency w.r.t. leasing.
 */
#define	LEASE_READ	0x1		/* Check lease for readers */
#define	LEASE_WRITE	0x2		/* Check lease for modifiers */

#endif /* _KERNEL */


/*
 * Mods for exensibility.
 */

/*
 * Flags for vdesc_flags:
 */
#define VDESC_MAX_VPS		8
/* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
#define VDESC_VP0_WILLRELE	0x00000001
#define VDESC_VP1_WILLRELE	0x00000002
#define VDESC_VP2_WILLRELE	0x00000004
#define VDESC_VP3_WILLRELE	0x00000008
#define VDESC_VP0_WILLUNLOCK	0x00000100
#define VDESC_VP1_WILLUNLOCK	0x00000200
#define VDESC_VP2_WILLUNLOCK	0x00000400
#define VDESC_VP3_WILLUNLOCK	0x00000800
#define VDESC_VP0_WILLPUT	0x00000101
#define VDESC_VP1_WILLPUT	0x00000202
#define VDESC_VP2_WILLPUT	0x00000404
#define VDESC_VP3_WILLPUT	0x00000808
#define VDESC_NOMAP_VPP		0x00010000
#define VDESC_VPP_WILLRELE	0x00020000

/*
 * VDESC_NO_OFFSET is used to identify the end of the offset list
 * and in places where no such field exists.
 */
#define VDESC_NO_OFFSET -1

/*
 * This structure describes the vnode operation taking place.
 */
struct vnodeop_desc {
	int	vdesc_offset;		/* offset in vector--first for speed */
	char    *vdesc_name;		/* a readable name for debugging */
	int	vdesc_flags;		/* VDESC_* flags */

	/*
	 * These ops are used by bypass routines to map and locate arguments.
	 * Creds and procs are not needed in bypass routines, but sometimes
	 * they are useful to (for example) transport layers.
	 * Nameidata is useful because it has a cred in it.
	 */
	int	*vdesc_vp_offsets;	/* list ended by VDESC_NO_OFFSET */
	int	vdesc_vpp_offset;	/* return vpp location */
	int	vdesc_cred_offset;	/* cred location, if any */
	int	vdesc_proc_offset;	/* proc location, if any */
	int	vdesc_componentname_offset; /* if any */
	/*
	 * Finally, we've got a list of private data (about each operation)
	 * for each transport layer.  (Support to manage this list is not
	 * yet part of BSD.)
	 */
	caddr_t	*vdesc_transports;
};

#ifdef _KERNEL
/*
 * A list of all the operation descs.
 */
extern struct vnodeop_desc *vnodeop_descs[];

/*
 * Interlock for scanning list of vnodes attached to a mountpoint
 */
extern struct simplelock mntvnode_slock;

/*
 * This macro is very helpful in defining those offsets in the vdesc struct.
 *
 * This is stolen from X11R4.  I ingored all the fancy stuff for
 * Crays, so if you decide to port this to such a serious machine,
 * you might want to consult Intrisics.h's XtOffset{,Of,To}.
 */
#define VOPARG_OFFSET(p_type,field) \
        ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
#define VOPARG_OFFSETOF(s_type,field) \
	VOPARG_OFFSET(s_type*,field)
#define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
	((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))


/*
 * This structure is used to configure the new vnodeops vector.
 */
struct vnodeopv_entry_desc {
	struct vnodeop_desc *opve_op;   /* which operation this is */
	int (*opve_impl) __P((void *));	/* code implementing this operation */
};
struct vnodeopv_desc {
			/* ptr to the ptr to the vector where op should go */
	int (***opv_desc_vector_p) __P((void *));
	struct vnodeopv_entry_desc *opv_desc_ops;   /* null terminated list */
};

/*
 * A default routine which just returns an error.
 */
int vn_default_error __P((void *));

/*
 * A generic structure.
 * This can be used by bypass routines to identify generic arguments.
 */
struct vop_generic_args {
	struct vnodeop_desc *a_desc;
	/* other random data follows, presumably */
};

/*
 * VOCALL calls an op given an ops vector.  We break it out because BSD's
 * vclean changes the ops vector and then wants to call ops with the old
 * vector.
 */
/*
 * actually, vclean doesn't use it anymore, but nfs does,
 * for device specials and fifos.
 */
#define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))

/*
 * This call works for vnodes in the kernel.
 */
#define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
#define VDESC(OP) (& __CONCAT(OP,_desc))
#define VOFFSET(OP) (VDESC(OP)->vdesc_offset)

/*
 * Finally, include the default set of vnode operations.
 */
#include <sys/vnode_if.h>

/*
 * Public vnode manipulation functions.
 */
struct file;
struct filedesc;
struct mount;
struct nameidata;
struct proc;
struct stat;
struct ucred;
struct uio;
struct vattr;
struct vnode;

int 	bdevvp __P((dev_t dev, struct vnode **vpp));
int 	cdevvp __P((dev_t dev, struct vnode **vpp));
int 	getnewvnode __P((enum vtagtype tag, struct mount *mp,
			 int (**vops) __P((void *)), struct vnode **vpp));
void	ungetnewvnode __P((struct vnode *));
int	getvnode __P((struct filedesc *fdp, int fd, struct file **fpp));
void	vfs_getnewfsid __P((struct mount *));
int	speedup_syncer __P((void));
void 	vattr_null __P((struct vattr *vap));
int 	vcount __P((struct vnode *vp));
void	vclean __P((struct vnode *, int, struct proc *));
int	vfinddev __P((dev_t, enum vtype, struct vnode **));
void	vflushbuf __P((struct vnode *vp, int sync));
int	vflush __P((struct mount *mp, struct vnode *vp, int flags));
void	vntblinit __P((void));
void	vwakeup __P((struct buf *));
void	vdevgone __P((int, int, int, enum vtype));
int 	vget __P((struct vnode *vp, int lockflag));
void 	vgone __P((struct vnode *vp));
void	vgonel __P((struct vnode *vp, struct proc *p));
int	vinvalbuf __P((struct vnode *vp, int save, struct ucred *cred,
	    struct proc *p, int slpflag, int slptimeo));
int	vtruncbuf __P((struct vnode *vp, daddr_t lbn,
	    int slpflag, int slptimeo));
void	vprint __P((char *label, struct vnode *vp));
int	vrecycle __P((struct vnode *vp, struct simplelock *inter_lkp,
	    struct proc *p));
int	vn_bwrite __P((void *ap));
int 	vn_close __P((struct vnode *vp,
	    int flags, struct ucred *cred, struct proc *p));
int 	vn_closefile __P((struct file *fp, struct proc *p));
int	vn_ioctl __P((struct file *fp, u_long com, caddr_t data,
	    struct proc *p));
int	vn_fcntl __P((struct file *fp, u_int com, caddr_t data,
	    struct proc *p));
int	vn_lock __P((struct vnode *vp, int flags));
u_int	vn_setrecurse __P((struct vnode *vp));
void	vn_restorerecurse __P((struct vnode *vp, u_int flags));
int 	vn_open __P((struct nameidata *ndp, int fmode, int cmode));
int 	vn_rdwr __P((enum uio_rw rw, struct vnode *vp, caddr_t base,
	    int len, off_t offset, enum uio_seg segflg, int ioflg,
	    struct ucred *cred, size_t *aresid, struct proc *p));
int	vn_read __P((struct file *fp, off_t *offset, struct uio *uio,
	    struct ucred *cred, int flags));
int	vn_readdir __P((struct file *fp, char *buf, int segflg, u_int count,
	    int *done, struct proc *p, off_t **cookies, int *ncookies));
int	vn_poll __P((struct file *fp, int events, struct proc *p));
int	vn_stat __P((struct vnode *vp, struct stat *sb, struct proc *p));
void	vn_syncer_add_to_worklist __P((struct vnode *vp, int delay));
void	vn_syncer_remove_from_worklist __P((struct vnode *vp));
int	vn_write __P((struct file *fp, off_t *offset, struct uio *uio,
	    struct ucred *cred, int flags));
int	vn_writechk __P((struct vnode *vp));
void	vn_marktext __P((struct vnode *vp));
int	vn_isunder __P((struct vnode *dvp, struct vnode *rvp, struct proc *p));
struct vnode *
	checkalias __P((struct vnode *vp, dev_t nvp_rdev, struct mount *mp));
void 	vput __P((struct vnode *vp));
void 	vrele __P((struct vnode *vp));
int	vaccess __P((enum vtype type, mode_t file_mode, uid_t uid, gid_t gid,
		     mode_t acc_mode, struct ucred *cred));
#ifdef DDB
void	vfs_vnode_print __P((struct vnode *, int, void (*)(const char *, ...)));
#endif /* DDB */
#endif /* _KERNEL */

#endif /* !_SYS_VNODE_H_ */