freebsd-skq/sys/miscfs/umapfs/umap_vfsops.c

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/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* the UCLA Ficus project.
*
* 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.
*
* @(#)umap_vfsops.c 8.3 (Berkeley) 1/21/94
*
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* $Id: umap_vfsops.c,v 1.9 1995/12/03 14:54:40 bde Exp $
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*/
/*
* Umap Layer
* (See mount_umap(8) for a description of this layer.)
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
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#include <sys/time.h>
#include <sys/types.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <miscfs/umapfs/umap.h>
extern int umapfs_init __P((void));
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static int umapfs_fhtovp __P((struct mount *mp, struct fid *fidp,
struct mbuf *nam, struct vnode **vpp,
int *exflagsp, struct ucred **credanonp));
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static int umapfs_mount __P((struct mount *mp, char *path, caddr_t data,
struct nameidata *ndp, struct proc *p));
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static int umapfs_quotactl __P((struct mount *mp, int cmd, uid_t uid,
caddr_t arg, struct proc *p));
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static int umapfs_root __P((struct mount *mp, struct vnode **vpp));
static int umapfs_start __P((struct mount *mp, int flags, struct proc *p));
static int umapfs_statfs __P((struct mount *mp, struct statfs *sbp,
struct proc *p));
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static int umapfs_sync __P((struct mount *mp, int waitfor,
struct ucred *cred, struct proc *p));
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static int umapfs_unmount __P((struct mount *mp, int mntflags,
struct proc *p));
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static int umapfs_vget __P((struct mount *mp, ino_t ino,
struct vnode **vpp));
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static int umapfs_vptofh __P((struct vnode *vp, struct fid *fhp));
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/*
* Mount umap layer
*/
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static int
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umapfs_mount(mp, path, data, ndp, p)
struct mount *mp;
char *path;
caddr_t data;
struct nameidata *ndp;
struct proc *p;
{
struct umap_args args;
struct vnode *lowerrootvp, *vp;
struct vnode *umapm_rootvp;
struct umap_mount *amp;
u_int size;
int error;
#ifdef UMAPFS_DIAGNOSTIC
printf("umapfs_mount(mp = %x)\n", mp);
#endif
/*
* Update is a no-op
*/
if (mp->mnt_flag & MNT_UPDATE) {
return (EOPNOTSUPP);
/* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, p));*/
}
/*
* Get argument
*/
error = copyin(data, (caddr_t)&args, sizeof(struct umap_args));
if (error)
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return (error);
/*
* Find lower node
*/
NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
UIO_USERSPACE, args.target, p);
error = namei(ndp);
if (error)
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return (error);
/*
* Sanity check on lower vnode
*/
lowerrootvp = ndp->ni_vp;
#ifdef UMAPFS_DIAGNOSTIC
printf("vp = %x, check for VDIR...\n", lowerrootvp);
#endif
vrele(ndp->ni_dvp);
ndp->ni_dvp = 0;
if (lowerrootvp->v_type != VDIR) {
vput(lowerrootvp);
return (EINVAL);
}
#ifdef UMAPFS_DIAGNOSTIC
printf("mp = %x\n", mp);
#endif
amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
M_UFSMNT, M_WAITOK); /* XXX */
/*
* Save reference to underlying FS
*/
amp->umapm_vfs = lowerrootvp->v_mount;
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/*
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* Now copy in the number of entries and maps for umap mapping.
*/
amp->info_nentries = args.nentries;
amp->info_gnentries = args.gnentries;
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error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
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2*sizeof(u_long)*args.nentries);
if (error)
return (error);
#ifdef UMAP_DIAGNOSTIC
printf("umap_mount:nentries %d\n",args.nentries);
for (i = 0; i < args.nentries; i++)
printf(" %d maps to %d\n", amp->info_mapdata[i][0],
amp->info_mapdata[i][1]);
#endif
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error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
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2*sizeof(u_long)*args.nentries);
if (error)
return (error);
#ifdef UMAP_DIAGNOSTIC
printf("umap_mount:gnentries %d\n",args.gnentries);
for (i = 0; i < args.gnentries; i++)
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printf(" group %d maps to %d\n",
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amp->info_gmapdata[i][0],
amp->info_gmapdata[i][1]);
#endif
/*
* Save reference. Each mount also holds
* a reference on the root vnode.
*/
error = umap_node_create(mp, lowerrootvp, &vp);
/*
* Unlock the node (either the lower or the alias)
*/
VOP_UNLOCK(vp);
/*
* Make sure the node alias worked
*/
if (error) {
vrele(lowerrootvp);
free(amp, M_UFSMNT); /* XXX */
return (error);
}
/*
* Keep a held reference to the root vnode.
* It is vrele'd in umapfs_unmount.
*/
umapm_rootvp = vp;
umapm_rootvp->v_flag |= VROOT;
amp->umapm_rootvp = umapm_rootvp;
if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_data = (qaddr_t) amp;
getnewfsid(mp, MOUNT_LOFS);
(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
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(void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
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&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
#ifdef UMAPFS_DIAGNOSTIC
printf("umapfs_mount: lower %s, alias at %s\n",
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
#endif
return (0);
}
/*
* VFS start. Nothing needed here - the start routine
* on the underlying filesystem will have been called
* when that filesystem was mounted.
*/
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static int
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umapfs_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
return (0);
/* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */
}
/*
* Free reference to umap layer
*/
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static int
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umapfs_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
struct vnode *umapm_rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
int error;
int flags = 0;
#ifdef UMAPFS_DIAGNOSTIC
printf("umapfs_unmount(mp = %x)\n", mp);
#endif
if (mntflags & MNT_FORCE) {
/* lofs can never be rootfs so don't check for it */
if (!doforce)
return (EINVAL);
flags |= FORCECLOSE;
}
/*
* Clear out buffer cache. I don't think we
* ever get anything cached at this level at the
* moment, but who knows...
*/
#ifdef notyet
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mntflushbuf(mp, 0);
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if (mntinvalbuf(mp, 1))
return (EBUSY);
#endif
if (umapm_rootvp->v_usecount > 1)
return (EBUSY);
error = vflush(mp, umapm_rootvp, flags);
if (error)
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return (error);
#ifdef UMAPFS_DIAGNOSTIC
vprint("alias root of lower", umapm_rootvp);
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#endif
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/*
* Release reference on underlying root vnode
*/
vrele(umapm_rootvp);
/*
* And blow it away for future re-use
*/
vgone(umapm_rootvp);
/*
* Finally, throw away the umap_mount structure
*/
free(mp->mnt_data, M_UFSMNT); /* XXX */
mp->mnt_data = 0;
return (0);
}
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static int
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umapfs_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
struct vnode *vp;
#ifdef UMAPFS_DIAGNOSTIC
printf("umapfs_root(mp = %x, vp = %x->%x)\n", mp,
MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)
);
#endif
/*
* Return locked reference to root.
*/
vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
VREF(vp);
VOP_LOCK(vp);
*vpp = vp;
return (0);
}
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static int
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umapfs_quotactl(mp, cmd, uid, arg, p)
struct mount *mp;
int cmd;
uid_t uid;
caddr_t arg;
struct proc *p;
{
return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p));
}
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static int
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umapfs_statfs(mp, sbp, p)
struct mount *mp;
struct statfs *sbp;
struct proc *p;
{
int error;
struct statfs mstat;
#ifdef UMAPFS_DIAGNOSTIC
printf("umapfs_statfs(mp = %x, vp = %x->%x)\n", mp,
MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)
);
#endif
bzero(&mstat, sizeof(mstat));
error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, p);
if (error)
return (error);
/* now copy across the "interesting" information and fake the rest */
sbp->f_type = mstat.f_type;
sbp->f_flags = mstat.f_flags;
sbp->f_bsize = mstat.f_bsize;
sbp->f_iosize = mstat.f_iosize;
sbp->f_blocks = mstat.f_blocks;
sbp->f_bfree = mstat.f_bfree;
sbp->f_bavail = mstat.f_bavail;
sbp->f_files = mstat.f_files;
sbp->f_ffree = mstat.f_ffree;
if (sbp != &mp->mnt_stat) {
bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
}
return (0);
}
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static int
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umapfs_sync(mp, waitfor, cred, p)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
/*
* XXX - Assumes no data cached at umap layer.
*/
return (0);
}
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static int
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umapfs_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
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return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp));
}
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static int
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umapfs_fhtovp(mp, fidp, nam, vpp, exflagsp, credanonp)
struct mount *mp;
struct fid *fidp;
struct mbuf *nam;
struct vnode **vpp;
int *exflagsp;
struct ucred**credanonp;
{
return (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, nam, vpp, exflagsp,credanonp));
}
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static int
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umapfs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
return (VFS_VPTOFH(UMAPVPTOLOWERVP(vp), fhp));
}
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static struct vfsops umap_vfsops = {
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umapfs_mount,
umapfs_start,
umapfs_unmount,
umapfs_root,
umapfs_quotactl,
umapfs_statfs,
umapfs_sync,
umapfs_vget,
umapfs_fhtovp,
umapfs_vptofh,
umapfs_init,
};
VFS_SET(umap_vfsops, umap, MOUNT_UMAP, VFCF_LOOPBACK);