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Text File | 1992-09-04 | 13.9 KB | 334 lines | [TEXT/UNIX] |
- /*
- * Copyright (c) 1989 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)vnode.h 7.39 (Berkeley) 6/27/91
- */
-
- #ifndef KERNEL
- #include <machine/endian.h>
- #endif
-
- /*
- * The vnode is the focus of all file activity in UNIX.
- * There is a unique vnode allocated for each active file,
- * each current directory, each mounted-on file, text file, and the root.
- */
-
- /*
- * vnode types. VNON means no type.
- */
- enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD };
-
- /*
- * Vnode tag types.
- * These are for the benefit of external programs only (e.g., pstat)
- * and should NEVER be inspected inside the kernel.
- */
- enum vtagtype { VT_NON, VT_UFS, VT_NFS, VT_MFS };
-
- /*
- * This defines the maximum size of the private data area
- * permitted for any file system type. A defined constant
- * is used rather than a union structure to cut down on the
- * number of header files that must be included.
- */
- #define VN_MAXPRIVATE 188
-
- struct vnode {
- u_long v_flag; /* vnode flags (see below) */
- short v_usecount; /* reference count of users */
- short v_writecount; /* reference count of writers */
- long v_holdcnt; /* page & buffer references */
- off_t v_lastr; /* last read (read-ahead) */
- u_long v_id; /* capability identifier */
- struct mount *v_mount; /* ptr to vfs we are in */
- struct vnodeops *v_op; /* vnode operations */
- struct vnode *v_freef; /* vnode freelist forward */
- struct vnode **v_freeb; /* vnode freelist back */
- struct vnode *v_mountf; /* vnode mountlist forward */
- struct vnode **v_mountb; /* vnode mountlist back */
- struct buf *v_cleanblkhd; /* clean blocklist head */
- struct buf *v_dirtyblkhd; /* dirty blocklist head */
- long v_numoutput; /* num of writes in progress */
- enum vtype v_type; /* vnode type */
- union {
- struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
- struct socket *vu_socket; /* unix ipc (VSOCK) */
- caddr_t vu_vmdata; /* private data for vm (VREG) */
- struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */
- struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */
- } v_un;
- enum vtagtype v_tag; /* type of underlying data */
- char v_data[VN_MAXPRIVATE]; /* private data for fs */
- };
- #define v_mountedhere v_un.vu_mountedhere
- #define v_socket v_un.vu_socket
- #define v_vmdata v_un.vu_vmdata
- #define v_specinfo v_un.vu_specinfo
- #define v_fifoinfo v_un.vu_fifoinfo
-
- /*
- * vnode flags.
- */
- #define VROOT 0x0001 /* root of its file system */
- #define VTEXT 0x0002 /* vnode is a pure text prototype */
- #define VSYSTEM 0x0004 /* vnode being used by kernel */
- #define VXLOCK 0x0100 /* vnode is locked to change underlying type */
- #define VXWANT 0x0200 /* process is waiting for vnode */
- #define VBWAIT 0x0400 /* waiting for output to complete */
- #define VALIASED 0x0800 /* vnode has an alias */
-
- /*
- * Vnode attributes. A field value of VNOVAL
- * represents a field whose value is unavailable
- * (getattr) or which is not to be changed (setattr).
- */
- struct vattr {
- enum vtype va_type; /* vnode type (for create) */
- u_short va_mode; /* files access mode and type */
- short va_nlink; /* number of references to file */
- uid_t va_uid; /* owner user id */
- gid_t va_gid; /* owner group id */
- long va_fsid; /* file system id (dev for now) */
- long va_fileid; /* file id */
- u_quad va_qsize; /* file size in bytes */
- long va_blocksize; /* blocksize preferred for i/o */
- struct timeval va_atime; /* time of last access */
- struct timeval va_mtime; /* time of last modification */
- struct timeval va_ctime; /* time file changed */
- u_long va_gen; /* generation number of file */
- u_long va_flags; /* flags defined for file */
- dev_t va_rdev; /* device the special file represents */
- u_quad va_qbytes; /* bytes of disk space held by file */
- };
- #if BYTE_ORDER == LITTLE_ENDIAN
- #define va_size va_qsize.val[0]
- #define va_size_rsv va_qsize.val[1]
- #define va_bytes va_qbytes.val[0]
- #define va_bytes_rsv va_qbytes.val[1]
- #else
- #define va_size va_qsize.val[1]
- #define va_size_rsv va_qsize.val[0]
- #define va_bytes va_qbytes.val[1]
- #define va_bytes_rsv va_qbytes.val[0]
- #endif
-
- /*
- * Operations on vnodes.
- */
- #ifdef __STDC__
- struct flock;
- struct nameidata;
- #endif
-
- struct vnodeops {
- int (*vop_lookup) __P((struct vnode *vp, struct nameidata *ndp,
- struct proc *p));
- int (*vop_create) __P((struct nameidata *ndp, struct vattr *vap,
- struct proc *p));
- int (*vop_mknod) __P((struct nameidata *ndp, struct vattr *vap,
- struct ucred *cred, struct proc *p));
- int (*vop_open) __P((struct vnode *vp, int mode,
- struct ucred *cred, struct proc *p));
- int (*vop_close) __P((struct vnode *vp, int fflag,
- struct ucred *cred, struct proc *p));
- int (*vop_access) __P((struct vnode *vp, int mode,
- struct ucred *cred, struct proc *p));
- int (*vop_getattr) __P((struct vnode *vp, struct vattr *vap,
- struct ucred *cred, struct proc *p));
- int (*vop_setattr) __P((struct vnode *vp, struct vattr *vap,
- struct ucred *cred, struct proc *p));
- int (*vop_read) __P((struct vnode *vp, struct uio *uio,
- int ioflag, struct ucred *cred));
- int (*vop_write) __P((struct vnode *vp, struct uio *uio,
- int ioflag, struct ucred *cred));
- int (*vop_ioctl) __P((struct vnode *vp, int command,
- caddr_t data, int fflag,
- struct ucred *cred, struct proc *p));
- int (*vop_select) __P((struct vnode *vp, int which, int fflags,
- struct ucred *cred, struct proc *p));
- int (*vop_mmap) __P((struct vnode *vp, int fflags,
- struct ucred *cred, struct proc *p));
- int (*vop_fsync) __P((struct vnode *vp, int fflags,
- struct ucred *cred, int waitfor,
- struct proc *p));
- int (*vop_seek) __P((struct vnode *vp, off_t oldoff,
- off_t newoff, struct ucred *cred));
- int (*vop_remove) __P((struct nameidata *ndp, struct proc *p));
- int (*vop_link) __P((struct vnode *vp, struct nameidata *ndp,
- struct proc *p));
- int (*vop_rename) __P((struct nameidata *fndp,
- struct nameidata *tdnp, struct proc *p));
- int (*vop_mkdir) __P((struct nameidata *ndp, struct vattr *vap,
- struct proc *p));
- int (*vop_rmdir) __P((struct nameidata *ndp, struct proc *p));
- int (*vop_symlink) __P((struct nameidata *ndp, struct vattr *vap,
- char *target, struct proc *p));
- int (*vop_readdir) __P((struct vnode *vp, struct uio *uio,
- struct ucred *cred, int *eofflagp));
- int (*vop_readlink) __P((struct vnode *vp, struct uio *uio,
- struct ucred *cred));
- int (*vop_abortop) __P((struct nameidata *ndp));
- int (*vop_inactive) __P((struct vnode *vp, struct proc *p));
- int (*vop_reclaim) __P((struct vnode *vp));
- int (*vop_lock) __P((struct vnode *vp));
- int (*vop_unlock) __P((struct vnode *vp));
- int (*vop_bmap) __P((struct vnode *vp, daddr_t bn,
- struct vnode **vpp, daddr_t *bnp));
- int (*vop_strategy) __P((struct buf *bp));
- int (*vop_print) __P((struct vnode *vp));
- int (*vop_islocked) __P((struct vnode *vp));
- int (*vop_advlock) __P((struct vnode *vp, caddr_t id, int op,
- struct flock *fl, int flags));
- };
-
- /* Macros to call the vnode ops */
- #define VOP_LOOKUP(v,n,p) (*((v)->v_op->vop_lookup))(v,n,p)
- #define VOP_CREATE(n,a,p) (*((n)->ni_dvp->v_op->vop_create))(n,a,p)
- #define VOP_MKNOD(n,a,c,p) (*((n)->ni_dvp->v_op->vop_mknod))(n,a,c,p)
- #define VOP_OPEN(v,f,c,p) (*((v)->v_op->vop_open))(v,f,c,p)
- #define VOP_CLOSE(v,f,c,p) (*((v)->v_op->vop_close))(v,f,c,p)
- #define VOP_ACCESS(v,f,c,p) (*((v)->v_op->vop_access))(v,f,c,p)
- #define VOP_GETATTR(v,a,c,p) (*((v)->v_op->vop_getattr))(v,a,c,p)
- #define VOP_SETATTR(v,a,c,p) (*((v)->v_op->vop_setattr))(v,a,c,p)
- #define VOP_READ(v,u,i,c) (*((v)->v_op->vop_read))(v,u,i,c)
- #define VOP_WRITE(v,u,i,c) (*((v)->v_op->vop_write))(v,u,i,c)
- #define VOP_IOCTL(v,o,d,f,c,p) (*((v)->v_op->vop_ioctl))(v,o,d,f,c,p)
- #define VOP_SELECT(v,w,f,c,p) (*((v)->v_op->vop_select))(v,w,f,c,p)
- #define VOP_MMAP(v,c,p) (*((v)->v_op->vop_mmap))(v,c,p)
- #define VOP_FSYNC(v,f,c,w,p) (*((v)->v_op->vop_fsync))(v,f,c,w,p)
- #define VOP_SEEK(v,p,o,w) (*((v)->v_op->vop_seek))(v,p,o,w)
- #define VOP_REMOVE(n,p) (*((n)->ni_dvp->v_op->vop_remove))(n,p)
- #define VOP_LINK(v,n,p) (*((n)->ni_dvp->v_op->vop_link))(v,n,p)
- #define VOP_RENAME(s,t,p) (*((s)->ni_dvp->v_op->vop_rename))(s,t,p)
- #define VOP_MKDIR(n,a,p) (*((n)->ni_dvp->v_op->vop_mkdir))(n,a,p)
- #define VOP_RMDIR(n,p) (*((n)->ni_dvp->v_op->vop_rmdir))(n,p)
- #define VOP_SYMLINK(n,a,m,p) (*((n)->ni_dvp->v_op->vop_symlink))(n,a,m,p)
- #define VOP_READDIR(v,u,c,e) (*((v)->v_op->vop_readdir))(v,u,c,e)
- #define VOP_READLINK(v,u,c) (*((v)->v_op->vop_readlink))(v,u,c)
- #define VOP_ABORTOP(n) (*((n)->ni_dvp->v_op->vop_abortop))(n)
- #define VOP_INACTIVE(v,p) (*((v)->v_op->vop_inactive))(v,p)
- #define VOP_RECLAIM(v) (*((v)->v_op->vop_reclaim))(v)
- #define VOP_LOCK(v) (*((v)->v_op->vop_lock))(v)
- #define VOP_UNLOCK(v) (*((v)->v_op->vop_unlock))(v)
- #define VOP_BMAP(v,s,p,n) (*((v)->v_op->vop_bmap))(v,s,p,n)
- #define VOP_STRATEGY(b) (*((b)->b_vp->v_op->vop_strategy))(b)
- #define VOP_PRINT(v) (*((v)->v_op->vop_print))(v)
- #define VOP_ISLOCKED(v) (((v)->v_flag & VXLOCK) || \
- (*((v)->v_op->vop_islocked))(v))
- #define VOP_ADVLOCK(v,p,o,l,f) (*((v)->v_op->vop_advlock))(v,p,o,l,f)
-
- /*
- * flags for ioflag
- */
- #define IO_UNIT 0x01 /* do I/O as atomic unit */
- #define IO_APPEND 0x02 /* append write to end */
- #define IO_SYNC 0x04 /* do I/O synchronously */
- #define IO_NODELOCKED 0x08 /* underlying node already locked */
- #define IO_NDELAY 0x10 /* FNDELAY flag set in file table */
-
- /*
- * Modes. Some values same as Ixxx entries from inode.h for now
- */
- #define VSUID 04000 /* set user id on execution */
- #define VSGID 02000 /* set group id on execution */
- #define VSVTX 01000 /* save swapped text even after use */
- #define VREAD 0400 /* read, write, execute permissions */
- #define VWRITE 0200
- #define VEXEC 0100
-
- /*
- * Token indicating no attribute value yet assigned
- */
- #define VNOVAL ((unsigned)0xffffffff)
-
- #ifdef KERNEL
- /*
- * public vnode manipulation functions
- */
- int vn_open __P((struct nameidata *ndp, struct proc *p, int fmode,
- int cmode));
- int vn_close __P((struct vnode *vp, int flags, struct ucred *cred,
- struct proc *p));
- 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, int *aresid, struct proc *p));
- int vn_read __P((struct file *fp, struct uio *uio, struct ucred *cred));
- int vn_write __P((struct file *fp, struct uio *uio, struct ucred *cred));
- int vn_ioctl __P((struct file *fp, int com, caddr_t data, struct proc *p));
- int vn_select __P((struct file *fp, int which, struct proc *p));
- int vn_closefile __P((struct file *fp, struct proc *p));
- int getnewvnode __P((enum vtagtype tag, struct mount *mp,
- struct vnodeops *vops, struct vnode **vpp));
- int bdevvp __P((int dev, struct vnode **vpp));
- /* check for special device aliases */
- /* XXX nvp_rdev should be type dev_t, not int */
- struct vnode *checkalias __P((struct vnode *vp, int nvp_rdev,
- struct mount *mp));
- void vattr_null __P((struct vattr *vap));
- int vcount __P((struct vnode *vp)); /* total references to a device */
- int vget __P((struct vnode *vp)); /* get first reference to a vnode */
- void vref __P((struct vnode *vp)); /* increase reference to a vnode */
- void vput __P((struct vnode *vp)); /* unlock and release vnode */
- void vrele __P((struct vnode *vp)); /* release vnode */
- void vgone __P((struct vnode *vp)); /* completely recycle vnode */
- void vgoneall __P((struct vnode *vp));/* recycle vnode and all its aliases */
-
- /*
- * Flags to various vnode functions.
- */
- #define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */
- #define FORCECLOSE 0x0002 /* vflush: force file closeure */
- #define DOCLOSE 0x0004 /* vclean: close active files */
-
- #ifndef DIAGNOSTIC
- #define VREF(vp) (vp)->v_usecount++ /* increase reference */
- #define VHOLD(vp) (vp)->v_holdcnt++ /* increase buf or page ref */
- #define HOLDRELE(vp) (vp)->v_holdcnt-- /* decrease buf or page ref */
- #define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
- #else /* DIAGNOSTIC */
- #define VREF(vp) vref(vp)
- #define VHOLD(vp) vhold(vp)
- #define HOLDRELE(vp) holdrele(vp)
- #define VATTR_NULL(vap) vattr_null(vap)
- #endif
-
- #define NULLVP ((struct vnode *)NULL)
-
- /*
- * Global vnode data.
- */
- extern struct vnode *rootdir; /* root (i.e. "/") vnode */
- extern long desiredvnodes; /* number of vnodes desired */
- extern struct vattr va_null; /* predefined null vattr structure */
- #endif
-