Protect v_usecount with a critical section for now (we depend on the BGL),

[dragonfly.git] / sys / kern / vnode_if.src

#
# 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        8.12 (Berkeley) 5/14/95
# $FreeBSD: src/sys/kern/vnode_if.src,v 1.29.2.3 2001/05/18 09:58:45 bp Exp $
# $DragonFly: src/sys/kern/Attic/vnode_if.src,v 1.6 2004/03/01 06:33:17 dillon Exp $
#

#
# 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 succesful return, and the
# "error" column defines the locking state on error exit.
#
# The locking value can take the following values:
# L: locked; not converted to type of lock.
# A: any lock type.
# S: locked with shared lock.
# E: locked with exclusive lock for this process.
# O: locked with exclusive lock for other process.
# 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.
#

#
#% islocked     vp      = = =
#
vop_islocked {
        IN struct vnode *vp;
        IN struct thread *td;
};

#
#% 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.
#
vop_lookup {
        IN struct vnode *dvp;
        IN struct namecache *par;
        INOUT struct vnode **vpp;
        INOUT struct namecache **ncpp;
        IN struct componentname *cnp;
};

#
#% cachedlookup dvp     L ? ?
#% cachedlookup vpp     - L -
#
# This must be an exact copy of lookup.  See kern/vfs_cache.c for details.
#
vop_cachedlookup {
        IN struct vnode *dvp;
        IN struct namecache *par;
        INOUT struct vnode **vpp;
        INOUT struct namecache **ncpp;
        IN struct componentname *cnp;
};

#
#% create       dvp     L L L
#% create       vpp     - L -
#
vop_create {
        IN struct vnode *dvp;
        IN struct namecache *par;
        OUT struct vnode **vpp;
        IN struct componentname *cnp;
        IN struct vattr *vap;
};

#
#% whiteout     dvp     L L L
#
vop_whiteout {
        IN struct vnode *dvp;
        IN struct namecache *par;
        IN struct componentname *cnp;
        IN int flags;
};

#
#% mknod        dvp     L L L
#% mknod        vpp     - X -
#
vop_mknod {
        IN struct vnode *dvp;
        IN struct namecache *par;
        OUT struct vnode **vpp;
        IN struct componentname *cnp;
        IN struct vattr *vap;
};

#
#% open         vp      L L L
#
vop_open {
        IN struct vnode *vp;
        IN int mode;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% close        vp      U U U
#
vop_close {
        IN struct vnode *vp;
        IN int fflag;
        IN struct thread *td;
};

#
#% access       vp      L L L
#
vop_access {
        IN struct vnode *vp;
        IN int mode;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% getattr      vp      = = =
#
vop_getattr {
        IN struct vnode *vp;
        OUT struct vattr *vap;
        IN struct thread *td;
};

#
#% setattr      vp      L L L
#
vop_setattr {
        IN struct vnode *vp;
        IN struct vattr *vap;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% read         vp      L L L
#
vop_read {
        IN struct vnode *vp;
        INOUT struct uio *uio;
        IN int ioflag;
        IN struct ucred *cred;
};

#
#% write        vp      L L L
#
vop_write {
        IN struct vnode *vp;
        INOUT struct uio *uio;
        IN int ioflag;
        IN struct ucred *cred;
};

#
#% lease        vp      = = =
#
vop_lease {
        IN struct vnode *vp;
        IN struct thread *td;
        IN struct ucred *cred;
        IN int flag;
};

#
#% ioctl        vp      U U U
#
vop_ioctl {
        IN struct vnode *vp;
        IN u_long command;
        IN caddr_t data;
        IN int fflag;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% poll vp      U U U
#
vop_poll {
        IN struct vnode *vp;
        IN int events;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% kqfilter     vp      U U U
#
vop_kqfilter {
        IN struct vnode *vp;
        IN struct knote *kn;
};

#
#% revoke       vp      U U U
#
vop_revoke {
        IN struct vnode *vp;
        IN int flags;
};

#
# XXX - not used
#
vop_mmap {
        IN struct vnode *vp;
        IN int fflags;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% fsync        vp      L L L
#
vop_fsync {
        IN struct vnode *vp;
        IN int waitfor;
        IN struct thread *td;
};

#
#% remove       dvp     L L L
#% remove       vp      L L L
#
vop_remove {
        IN struct vnode *dvp;
        IN struct namecache *par;
        IN struct vnode *vp;
        IN struct componentname *cnp;
};

#
#% link         tdvp    L L L
#% link         vp      U U U
#
vop_link {
        IN struct vnode *tdvp;
        IN struct namecache *par;
        IN 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
#
vop_rename {
        IN WILLRELE struct vnode *fdvp;
        IN struct namecache *fpar;
        IN WILLRELE struct vnode *fvp;
        IN struct componentname *fcnp;
        IN WILLRELE struct vnode *tdvp;
        IN struct namecache *tpar;
        IN WILLRELE struct vnode *tvp;
        IN struct componentname *tcnp;
};

#
#% mkdir        dvp     L L L
#% mkdir        vpp     - L -
#
vop_mkdir {
        IN struct vnode *dvp;
        IN struct namecache *par;
        OUT struct vnode **vpp;
        IN struct componentname *cnp;
        IN struct vattr *vap;
};

#
#% rmdir        dvp     L L L
#% rmdir        vp      L L L
#
vop_rmdir {
        IN struct vnode *dvp;
        IN struct namecache *par;
        IN struct vnode *vp;
        IN struct componentname *cnp;
};

#
#% symlink      dvp     L L L
#% symlink      vpp     - U -
#
vop_symlink {
        IN struct vnode *dvp;
        IN struct namecache *par;
        OUT struct vnode **vpp;
        IN struct componentname *cnp;
        IN struct vattr *vap;
        IN char *target;
};

#
#% readdir      vp      L L L
#
vop_readdir {
        IN struct vnode *vp;
        INOUT struct uio *uio;
        IN struct ucred *cred;
        INOUT int *eofflag;
        OUT int *ncookies;
        INOUT u_long **cookies;
};

#
#% readlink     vp      L L L
#
vop_readlink {
        IN struct vnode *vp;
        INOUT struct uio *uio;
        IN struct ucred *cred;
};

#
#% inactive     vp      L U U
#
vop_inactive {
        IN struct vnode *vp;
        IN struct thread *td;
};

#
#% reclaim      vp      U U U
#
vop_reclaim {
        IN struct vnode *vp;
        IN struct thread *td;
};

#
#% lock         vp      ? ? ?
#
vop_lock {
        IN struct vnode *vp;
        IN struct lwkt_tokref *vlock;
        IN int flags;
        IN struct thread *td;
};

#
#% unlock       vp      L U L
#
vop_unlock {
        IN struct vnode *vp;
        IN struct lwkt_tokref *vlock;
        IN int flags;
        IN struct thread *td;
};

#
#% bmap         vp      L L L
#% bmap         vpp     - U -
#
vop_bmap {
        IN struct vnode *vp;
        IN daddr_t bn;
        OUT struct vnode **vpp;
        IN daddr_t *bnp;
        OUT int *runp;
        OUT int *runb;
};

#
#% strategy     vp      L L L
#
vop_strategy {
        IN struct vnode *vp;
        IN struct buf *bp;
};

#
#% print        vp      = = =
#
vop_print {
        IN struct vnode *vp;
};

#
#% pathconf     vp      L L L
#
vop_pathconf {
        IN struct vnode *vp;
        IN int name;
        OUT register_t *retval;
};

#
#% advlock      vp      U U U
#
vop_advlock {
        IN struct vnode *vp;
        IN caddr_t id;
        IN int op;
        IN struct flock *fl;
        IN int flags;
};

#
#% balloc       vp      L L L
#
vop_balloc {
        IN 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 struct vnode *vp;
        IN struct cluster_save *buflist;
};

#
#% getpages     vp      L L L
#
vop_getpages {
        IN struct vnode *vp;
        IN vm_page_t *m;
        IN int count;
        IN int reqpage;
        IN vm_ooffset_t offset;
};

#
#% putpages     vp      L L L
#
vop_putpages {
        IN struct vnode *vp;
        IN vm_page_t *m;
        IN int count;
        IN int sync;
        IN int *rtvals;
        IN vm_ooffset_t offset;
};

#
#% freeblks     vp      - - -
#
# This call is used by the filesystem to release blocks back to 
# device-driver.  This is useful if the driver has a lengthy 
# erase handling or similar.
#

vop_freeblks {
        IN struct vnode *vp;
        IN daddr_t addr;
        IN daddr_t length;
};

#
#% bwrite       vp      L L L
#
vop_bwrite {
        IN struct vnode *vp;
        IN struct buf *bp;
};

#
#% getacl       vp      = = =
#
vop_getacl {
        IN struct vnode *vp;
        IN acl_type_t type;
        OUT struct acl *aclp;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% setacl       vp      L L L
#
vop_setacl {
        IN struct vnode *vp;
        IN acl_type_t type;
        IN struct acl *aclp;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% aclcheck     vp      = = =
#
vop_aclcheck {
        IN struct vnode *vp;
        IN acl_type_t type;
        IN struct acl *aclp;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% getextattr   vp      L L L
#
vop_getextattr {
        IN struct vnode *vp;
        IN char *name;
        INOUT struct uio *uio;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% setextattr   vp      L L L
#
vop_setextattr {
        IN struct vnode *vp;
        IN char *name;
        INOUT struct uio *uio;
        IN struct ucred *cred;
        IN struct thread *td;
};

#
#% createvobject        vp      L L L
#
vop_createvobject {
        IN struct vnode *vp;
        IN struct thread *td;
};

#
#% destroyvobject       vp      L L L
#
vop_destroyvobject {
        IN struct vnode *vp;
};

#
#% getvobject   vp      L L L
#
vop_getvobject {
        IN struct vnode *vp;
        OUT struct vm_object **objpp;
};