NetBSD/sys/kern/vnode_if.src

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# $NetBSD: vnode_if.src,v 1.41 2004/09/21 03:10:35 thorpej Exp $
#
# Copyright (c) 1992, 1993
# 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_if.src 8.14 (Berkeley) 8/6/95
#
#
#
# Above each of the vop descriptors is a specification of the locking
# protocol used by each vop call. The first column is the name of
# the variable, the remaining three columns are in, out and error
# respectively. The "in" column defines the lock state on input,
# the "out" column defines the state on successful return, and the
# "error" column defines the locking state on error exit.
#
# The locking value can take the following values:
# L: locked.
# U: unlocked.
# -: not applicable. vnode does not yet (or no longer) exists.
# =: the same on input and output, may be either L or U.
# X: locked if not nil.
#
# For operations other than VOP_LOOKUP which require a component name
# parameter, the flags required for the initial namei() call are listed.
# Additional flags may be added to the namei() call, but these are required.
#
#
#% lookup dvp L ? ?
#% lookup vpp - L -
#
# XXX - the lookup locking protocol defies simple description and depends
# on the flags and operation fields in the (cnp) structure. Note
# especially that *vpp may equal dvp and both may be locked.
#
# More details:
# There are three types of lookups: ".", ".." (ISDOTDOT), and other.
# On successful lookup of ".", a reference is added to dvp, and it
# is returned in *vpp.
# To look up ISDOTDOT, dvp is unlocked, the ".." node is locked, and
# then dvp is relocked iff LOCKPARENT is set and this is the last
# component name (ISLASTCN set). This preserves the
# protocol of always locking nodes from root ("/") downward and
# prevents deadlock.
# Other lookups find the named node (creating the vnode if needed) and
# return it, locked, in *vpp.
# For non-"." lookups, if LOCKPARENT is not set or this was not the
# last component name, dvp is returned unlocked on a successful
# lookup.
# On failure, *vpp is NULL, and *dvp is left locked. If there was
# an error re-locking dvp (for instance in the ISDOTDOT case),
# the error is returned with PDIRUNLOCK set.
#
# *vpp is always locked on return if the operation succeeds.
# typically, if *vpp == dvp, you need to release twice, but unlock once.
#
# The PDIRUNLOCK flag is set when dvp is unlocked in the lookup routine.
# It signals the caller that dvp's lock state changed. It will
# be set on exit if either a successful lookup unlocked the
# parrent, or there was an error re-locking dvp in the ISDOTDOT case.
#
# See sys/sys/namei.h for a description of the SAVENAME and SAVESTART
# flags.
#
vop_lookup {
IN struct vnode *dvp;
INOUT struct vnode **vpp;
IN struct componentname *cnp;
};
#
#% create dvp L U U
#% create vpp - L -
#
#! create cnp CREATE, LOCKPARENT
#
vop_create {
IN LOCKED=YES WILLPUT struct vnode *dvp;
OUT struct vnode **vpp;
IN struct componentname *cnp;
IN struct vattr *vap;
};
#
#% mknod dvp L U U
#% mknod vpp - L -
#
#! mknod cnp CREATE, LOCKPARENT
#
vop_mknod {
IN LOCKED=YES WILLPUT struct vnode *dvp;
OUT struct vnode **vpp;
IN struct componentname *cnp;
IN struct vattr *vap;
};
#
#% open vp L L L
#
vop_open {
IN LOCKED=YES struct vnode *vp;
IN int mode;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% close vp L L L
#
vop_close {
IN LOCKED=YES struct vnode *vp;
IN int fflag;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% access vp L L L
#
vop_access {
IN LOCKED=YES struct vnode *vp;
IN int mode;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% getattr vp = = =
#
vop_getattr {
IN struct vnode *vp;
IN struct vattr *vap;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% setattr vp L L L
#
vop_setattr {
IN LOCKED=YES struct vnode *vp;
IN struct vattr *vap;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% read vp L L L
#
vop_read {
IN LOCKED=YES struct vnode *vp;
INOUT struct uio *uio;
IN int ioflag;
IN struct ucred *cred;
};
#
#% write vp L L L
#
vop_write {
IN LOCKED=YES struct vnode *vp;
INOUT struct uio *uio;
IN int ioflag;
IN struct ucred *cred;
};
#
#% ioctl vp U U U
#
vop_ioctl {
IN LOCKED=NO struct vnode *vp;
IN u_long command;
IN void *data;
IN int fflag;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% fcntl vp L L L
#
vop_fcntl {
IN LOCKED=YES struct vnode *vp;
IN u_int command;
IN void *data;
IN int fflag;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% poll vp U U U
#
vop_poll {
IN LOCKED=NO struct vnode *vp;
IN int events;
IN struct proc *p;
};
#
#% kqfilter vp U U U
#
vop_kqfilter {
IN LOCKED=NO struct vnode *vp;
IN struct knote *kn;
};
#
#% revoke vp U U U
#
vop_revoke {
IN LOCKED=NO struct vnode *vp;
IN int flags;
};
#
#% mmap vp = = =
#
vop_mmap {
IN struct vnode *vp;
IN int fflags;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% fsync vp L L L
#
vop_fsync {
IN LOCKED=YES struct vnode *vp;
IN struct ucred *cred;
IN int flags;
IN off_t offlo;
IN off_t offhi;
IN struct proc *p;
};
#
# Needs work: Is newoff right? What's it mean?
# XXX Locking prototocl?
#
vop_seek {
IN struct vnode *vp;
IN off_t oldoff;
IN off_t newoff;
IN struct ucred *cred;
};
#
#% remove dvp L U U
#% remove vp L U U
#
#! remove cnp DELETE, LOCKPARENT | LOCKLEAF
#
vop_remove {
IN LOCKED=YES WILLPUT struct vnode *dvp;
IN LOCKED=YES WILLPUT struct vnode *vp;
IN struct componentname *cnp;
};
#
#% link vp U U U
#% link dvp L U U
#
#! link cnp CREATE, LOCKPARENT
#
vop_link {
IN LOCKED=YES WILLPUT struct vnode *dvp;
IN LOCKED=NO struct vnode *vp;
IN struct componentname *cnp;
};
#
#% rename fdvp U U U
#% rename fvp U U U
#% rename tdvp L U U
#% rename tvp X U U
#
#! rename fcnp DELETE, WANTPARENT | SAVESTART
#! rename tcnp RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART
#
# XXX the vop_rename routines should REALLY NOT be depending on SAVESTART!
#
vop_rename {
IN LOCKED=NO WILLRELE struct vnode *fdvp;
IN LOCKED=NO WILLRELE struct vnode *fvp;
IN struct componentname *fcnp;
IN LOCKED=YES WILLPUT struct vnode *tdvp;
IN WILLPUT struct vnode *tvp;
IN struct componentname *tcnp;
};
#
#% mkdir dvp L U U
#% mkdir vpp - L -
#
#! mkdir cnp CREATE, LOCKPARENT
#
vop_mkdir {
IN LOCKED=YES WILLPUT struct vnode *dvp;
OUT struct vnode **vpp;
IN struct componentname *cnp;
IN struct vattr *vap;
};
#
#% rmdir dvp L U U
#% rmdir vp L U U
#
#! rmdir cnp DELETE, LOCKPARENT | LOCKLEAF
#
vop_rmdir {
IN LOCKED=YES WILLPUT struct vnode *dvp;
IN LOCKED=YES WILLPUT struct vnode *vp;
IN struct componentname *cnp;
};
#
#% symlink dvp L U U
#% symlink vpp - L -
#
#! symlink cnp CREATE, LOCKPARENT
#
vop_symlink {
IN LOCKED=YES WILLPUT struct vnode *dvp;
OUT struct vnode **vpp;
IN struct componentname *cnp;
IN struct vattr *vap;
IN char *target;
};
#
#% readdir vp L L L
#
vop_readdir {
IN LOCKED=YES struct vnode *vp;
INOUT struct uio *uio;
IN struct ucred *cred;
OUT int *eofflag;
OUT off_t **cookies;
IN int *ncookies;
};
#
#% readlink vp L L L
#
vop_readlink {
IN LOCKED=YES struct vnode *vp;
INOUT struct uio *uio;
IN struct ucred *cred;
};
#
#% abortop dvp = = =
#
#! abortop cnp as appropriate.
#
vop_abortop {
IN struct vnode *dvp;
IN struct componentname *cnp;
};
#
#% inactive vp L U U
#
vop_inactive {
IN LOCKED=YES WILLUNLOCK struct vnode *vp;
IN struct proc *p;
};
#
#% reclaim vp U U U
#
vop_reclaim {
IN LOCKED=NO struct vnode *vp;
IN struct proc *p;
};
#
#% lock vp U L U
#
vop_lock {
IN LOCKED=NO struct vnode *vp;
IN int flags;
};
#
#% unlock vp L U L
#
vop_unlock {
IN LOCKED=YES struct vnode *vp;
IN int flags;
};
#
#% bmap vp = = =
#% bmap vpp - U -
#
vop_bmap {
IN LOCKED=YES struct vnode *vp;
IN daddr_t bn;
OUT struct vnode **vpp;
IN daddr_t *bnp;
OUT int *runp;
};
#
#% strategy vp = = =
#
vop_strategy {
IN struct vnode *vp;
IN struct buf *bp;
};
#
#% print vp = = =
#
vop_print {
IN struct vnode *vp;
};
#
#% islocked vp = = =
#
vop_islocked {
IN struct vnode *vp;
};
#
#% pathconf vp L L L
#
vop_pathconf {
IN LOCKED=YES struct vnode *vp;
IN int name;
OUT register_t *retval;
};
#
#% advlock vp U U U
#
vop_advlock {
IN LOCKED=NO struct vnode *vp;
IN void *id;
IN int op;
IN struct flock *fl;
IN int flags;
};
#
#% blkatoff vp L L L
#
vop_blkatoff {
IN LOCKED=YES struct vnode *vp;
IN off_t offset;
OUT char **res;
OUT struct buf **bpp;
};
#
#% valloc pvp L L L
#
vop_valloc {
IN LOCKED=YES struct vnode *pvp;
IN int mode;
IN struct ucred *cred;
OUT struct vnode **vpp;
};
#
#% balloc vp L L L
#
vop_balloc {
IN LOCKED=YES struct vnode *vp;
IN off_t startoffset;
IN int size;
IN struct ucred *cred;
IN int flags;
OUT struct buf **bpp;
};
#
#% reallocblks vp L L L
#
vop_reallocblks {
IN LOCKED=YES struct vnode *vp;
IN struct cluster_save *buflist;
};
#
#% vfree pvp L L L
#
vop_vfree {
IN LOCKED=YES struct vnode *pvp;
IN ino_t ino;
IN int mode;
};
#
#% truncate vp L L L
#
vop_truncate {
IN LOCKED=YES struct vnode *vp;
IN off_t length;
IN int flags;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% update vp L L L
#
vop_update {
IN LOCKED=YES struct vnode *vp;
IN struct timespec *access;
IN struct timespec *modify;
IN int flags;
};
#
#% lease vp = = =
#
vop_lease {
IN struct vnode *vp;
IN struct proc *p;
IN struct ucred *cred;
IN int flag;
};
#
#% whiteout dvp L L L
#% whiteout cnp - - -
#% whiteout flag - - -
#
#! whiteout cnp CREATE, LOCKPARENT
#
vop_whiteout {
IN LOCKED=YES struct vnode *dvp;
IN struct componentname *cnp;
IN int flags;
};
#
# Needs work: no vp?
#
#vop_bwrite {
# IN struct buf *bp;
#};
#
#% getpages vp = = =
#
vop_getpages {
IN struct vnode *vp;
IN voff_t offset;
IN struct vm_page **m;
IN int *count;
IN int centeridx;
IN vm_prot_t access_type;
IN int advice;
IN int flags;
};
#
#% putpages vp = = =
#
vop_putpages {
IN struct vnode *vp;
IN voff_t offlo;
IN voff_t offhi;
IN int flags;
};