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freebsd-dev/sys/kern/vnode_if.src
Kirk McKusick f2a2857bb3 Add snapshots to the fast filesystem. Most of the changes support 
the gating of system calls that cause modifications to the underlying
filesystem. The gating can be enabled by any filesystem that needs
to consistently suspend operations by adding the vop_stdgetwritemount
to their set of vnops. Once gating is enabled, the function
vfs_write_suspend stops all new write operations to a filesystem,
allows any filesystem modifying system calls already in progress
to complete, then sync's the filesystem to disk and returns. The
function vfs_write_resume allows the suspended write operations to
begin again. Gating is not added by default for all filesystems as
for SMP systems it adds two extra locks to such critical kernel
paths as the write system call. Thus, gating should only be added
as needed.

Details on the use and current status of snapshots in FFS can be
found in /sys/ufs/ffs/README.snapshot so for brevity and timelyness
is not included here. Unless and until you create a snapshot file,
these changes should have no effect on your system (famous last words).
2000-07-11 22:07:57 +00:00

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#
# 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
# $FreeBSD$
#
#
# 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 proc *p;
};
#
#% 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;
INOUT struct vnode **vpp;
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;
INOUT struct vnode **vpp;
IN struct componentname *cnp;
};
#
#% create dvp L L L
#% create vpp - L -
#
vop_create {
IN struct vnode *dvp;
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 componentname *cnp;
IN int flags;
};
#
#% mknod dvp L L L
#% mknod vpp - X -
#
vop_mknod {
IN struct vnode *dvp;
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 proc *p;
};
#
#% close vp U U U
#
vop_close {
IN struct vnode *vp;
IN int fflag;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% access vp L L L
#
vop_access {
IN struct vnode *vp;
IN int mode;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% getattr vp = = =
#
vop_getattr {
IN struct vnode *vp;
OUT struct vattr *vap;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% setattr vp L L L
#
vop_setattr {
IN struct vnode *vp;
IN struct vattr *vap;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% 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 proc *p;
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 proc *p;
};
#
#% poll vp U U U
#
vop_poll {
IN struct vnode *vp;
IN int events;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% 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 proc *p;
};
#
#% fsync vp L L L
#
vop_fsync {
IN struct vnode *vp;
IN struct ucred *cred;
IN int waitfor;
IN struct proc *p;
};
#
#% remove dvp L L L
#% remove vp L L L
#
vop_remove {
IN struct vnode *dvp;
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 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 WILLRELE struct vnode *fvp;
IN struct componentname *fcnp;
IN WILLRELE struct vnode *tdvp;
IN WILLRELE struct vnode *tvp;
IN struct componentname *tcnp;
};
#
#% mkdir dvp L L L
#% mkdir vpp - L -
#
vop_mkdir {
IN struct vnode *dvp;
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 vnode *vp;
IN struct componentname *cnp;
};
#
#% symlink dvp L L L
#% symlink vpp - U -
#
vop_symlink {
IN 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 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 proc *p;
};
#
#% reclaim vp U U U
#
vop_reclaim {
IN struct vnode *vp;
IN struct proc *p;
};
#
#% lock vp ? ? ?
#
vop_lock {
IN struct vnode *vp;
IN int flags;
IN struct proc *p;
};
#
#% unlock vp L U L
#
vop_unlock {
IN struct vnode *vp;
IN int flags;
IN struct proc *p;
};
#
#% 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;
};
#
#% getwritemount vp = = =
#
vop_getwritemount {
IN struct vnode *vp;
OUT struct mount **mpp;
};
#
#% copyonwrite vp L L L
#
vop_copyonwrite {
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 proc *p;
};
#
#% 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 proc *p;
};
#
#% aclcheck vp = = =
#
vop_aclcheck {
IN struct vnode *vp;
IN acl_type_t type;
IN struct acl *aclp;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% getextattr vp = = =
#
vop_getextattr {
IN struct vnode *vp;
IN char *name;
INOUT struct uio *uio;
IN struct ucred *cred;
IN struct proc *p;
};
#
#% setextattr vp L L L
#
vop_setextattr {
IN struct vnode *vp;
IN char *name;
INOUT struct uio *uio;
IN struct ucred *cred;
IN struct proc *p;
};
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