67a15e9a78
through a layered file system. Note: we don't actually support snapshots through a layered file system, and this routine returns an error. However we: 1) have clearly documented what needs fixing (which isn't trivial to fix) and 2) if we do fix this, all layered file systems can take advantage of it at once.
313 lines
8.7 KiB
C
313 lines
8.7 KiB
C
/* $NetBSD: layer_vfsops.c,v 1.19 2004/05/29 23:48:08 wrstuden Exp $ */
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/*
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* Copyright (c) 1999 National Aeronautics & Space Administration
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* All rights reserved.
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*
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* This software was written by William Studenmund of the
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* Numerical Aerospace Simulation Facility, NASA Ames Research Center.
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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. Neither the name of the National Aeronautics & Space Administration
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* nor the names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB-
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* UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1992, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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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. 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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* from: Id: lofs_vfsops.c,v 1.9 1992/05/30 10:26:24 jsp Exp
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* from: @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92
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* @(#)null_vfsops.c 8.7 (Berkeley) 5/14/95
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*/
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/*
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* generic layer vfs ops.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: layer_vfsops.c,v 1.19 2004/05/29 23:48:08 wrstuden Exp $");
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/malloc.h>
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#include <miscfs/genfs/layer.h>
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#include <miscfs/genfs/layer_extern.h>
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/*
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* VFS start. Nothing needed here - the start routine
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* on the underlying filesystem will have been called
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* when that filesystem was mounted.
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*/
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int
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layerfs_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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{
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return (0);
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/* return VFS_START(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, flags, p); */
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}
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int
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layerfs_root(mp, vpp)
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struct mount *mp;
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struct vnode **vpp;
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{
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struct vnode *vp;
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#ifdef LAYERFS_DIAGNOSTIC
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printf("layerfs_root(mp = %p, vp = %p->%p)\n", mp,
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MOUNTTOLAYERMOUNT(mp)->layerm_rootvp,
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LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp));
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#endif
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/*
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* Return locked reference to root.
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*/
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vp = MOUNTTOLAYERMOUNT(mp)->layerm_rootvp;
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if (vp == NULL) {
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*vpp = NULL;
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return (EINVAL);
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}
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VREF(vp);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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*vpp = vp;
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return 0;
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}
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int
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layerfs_quotactl(mp, cmd, uid, arg, p)
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struct mount *mp;
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int cmd;
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uid_t uid;
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void *arg;
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struct proc *p;
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{
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return VFS_QUOTACTL(MOUNTTOLAYERMOUNT(mp)->layerm_vfs,
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cmd, uid, arg, p);
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}
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int
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layerfs_statvfs(mp, sbp, p)
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struct mount *mp;
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struct statvfs *sbp;
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struct proc *p;
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{
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int error;
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struct statvfs *sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
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#ifdef LAYERFS_DIAGNOSTIC
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printf("layerfs_statvfs(mp = %p, vp = %p->%p)\n", mp,
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MOUNTTOLAYERMOUNT(mp)->layerm_rootvp,
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LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp));
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#endif
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(void)memset(sbuf, 0, sizeof(*sbuf));
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error = VFS_STATVFS(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, sbuf, p);
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if (error)
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goto done;
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/* now copy across the "interesting" information and fake the rest */
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sbp->f_flag = sbuf->f_flag;
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sbp->f_bsize = sbuf->f_bsize;
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sbp->f_frsize = sbuf->f_frsize;
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sbp->f_iosize = sbuf->f_iosize;
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sbp->f_blocks = sbuf->f_blocks;
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sbp->f_bfree = sbuf->f_bfree;
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sbp->f_bavail = sbuf->f_bavail;
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sbp->f_bresvd = sbuf->f_bresvd;
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sbp->f_files = sbuf->f_files;
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sbp->f_ffree = sbuf->f_ffree;
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sbp->f_favail = sbuf->f_favail;
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sbp->f_fresvd = sbuf->f_fresvd;
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sbp->f_namemax = sbuf->f_namemax;
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copy_statvfs_info(sbp, mp);
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done:
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free(sbuf, M_TEMP);
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return error;
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}
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int
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layerfs_sync(mp, waitfor, cred, p)
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struct mount *mp;
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int waitfor;
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struct ucred *cred;
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struct proc *p;
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{
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/*
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* XXX - Assumes no data cached at layer.
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*/
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return (0);
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}
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int
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layerfs_vget(mp, ino, vpp)
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struct mount *mp;
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ino_t ino;
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struct vnode **vpp;
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{
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int error;
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struct vnode *vp;
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if ((error = VFS_VGET(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, ino, &vp))) {
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*vpp = NULL;
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return (error);
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}
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if ((error = layer_node_create(mp, vp, vpp))) {
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vput(vp);
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*vpp = NULL;
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return (error);
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}
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return (0);
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}
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int
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layerfs_fhtovp(mp, fidp, vpp)
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struct mount *mp;
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struct fid *fidp;
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struct vnode **vpp;
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{
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int error;
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struct vnode *vp;
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if ((error = VFS_FHTOVP(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, fidp, &vp)))
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return (error);
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if ((error = layer_node_create(mp, vp, vpp))) {
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vput(vp);
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*vpp = NULL;
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return (error);
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}
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return (0);
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}
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int
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layerfs_checkexp(mp, nam, exflagsp, credanonp)
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struct mount *mp;
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struct mbuf *nam;
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int *exflagsp;
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struct ucred**credanonp;
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{
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struct netcred *np;
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struct layer_mount *lmp = MOUNTTOLAYERMOUNT(mp);
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/*
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* get the export permission structure for this <mp, client> tuple.
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*/
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if ((np = vfs_export_lookup(mp, &lmp->layerm_export, nam)) == NULL)
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return (EACCES);
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*exflagsp = np->netc_exflags;
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*credanonp = &np->netc_anon;
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return (0);
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}
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int
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layerfs_vptofh(vp, fhp)
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struct vnode *vp;
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struct fid *fhp;
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{
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return (VFS_VPTOFH(LAYERVPTOLOWERVP(vp), fhp));
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}
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/*
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* layerfs_snapshot - handle a snapshot through a layered file system
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*
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* At present, we do NOT support snapshotting through a layered file
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* system as the ffs implementation changes v_vnlock of the snapshot
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* vnodes to point to one common lock. As there is no way for us to
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* absolutely pass this change up the stack, a layered file system
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* would end up referencing the wrong lock.
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*
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* This routine serves as a central resource for this behavior; all
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* layered file systems don't need to worry about the above. Also, if
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* things get fixed, all layers get the benefit.
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*/
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int
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layerfs_snapshot(struct mount *mp, struct vnode *vp, struct timespec *ts)
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{
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return (EOPNOTSUPP);
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}
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SYSCTL_SETUP(sysctl_vfs_layerfs_setup, "sysctl vfs.layerfs subtree setup")
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{
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "vfs", NULL,
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NULL, 0, NULL, 0,
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CTL_VFS, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "layerfs",
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SYSCTL_DESCR("Generic layered file system"),
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NULL, 0, NULL, 0,
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CTL_VFS, CTL_CREATE);
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/*
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* other subtrees should really be aliases to this, but since
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* they can't tell if layerfs has been instantiated yet, they
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* can't do that...not easily. not yet. :-)
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*/
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}
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