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