FreeBSD-5.3/sys/fs/umapfs/umap_vfsops.c
/*
* Copyright (c) 1992, 1993, 1995
* 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.
* 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 8.8 (Berkeley) 5/14/95
*
* $FreeBSD: src/sys/fs/umapfs/umap_vfsops.c,v 1.58 2004/07/30 22:08:51 phk Exp $
*/
/*
* Umap Layer
* (See mount_umapfs(8) for a description of this layer.)
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <fs/umapfs/umap.h>
static MALLOC_DEFINE(M_UMAPFSMNT, "UMAP mount", "UMAP mount structure");
static vfs_omount_t umapfs_omount;
static vfs_start_t umapfs_start;
static vfs_root_t umapfs_root;
static vfs_quotactl_t umapfs_quotactl;
static vfs_statfs_t umapfs_statfs;
static vfs_unmount_t umapfs_unmount;
static vfs_fhtovp_t umapfs_fhtovp;
static vfs_vptofh_t umapfs_vptofh;
static vfs_checkexp_t umapfs_checkexp;
static vfs_vget_t umapfs_vget;
static vfs_extattrctl_t umapfs_extattrctl;
/*
* Mount umap layer
*/
static int
umapfs_omount(mp, path, data, ndp, td)
struct mount *mp;
char *path;
caddr_t data;
struct nameidata *ndp;
struct thread *td;
{
struct umap_args args;
struct vnode *lowerrootvp, *vp;
struct vnode *umapm_rootvp;
struct umap_mount *amp;
size_t size;
int error;
#ifdef DEBUG
int i;
#endif
/*
* Only for root
*/
if ((error = suser(td)) != 0)
return (error);
#ifdef DEBUG
printf("umapfs_mount(mp = %p)\n", (void *)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, td));*/
}
/*
* Get argument
*/
error = copyin(data, (caddr_t)&args, sizeof(struct umap_args));
if (error)
return (error);
/*
* Find lower node
*/
NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
UIO_USERSPACE, args.target, td);
error = namei(ndp);
if (error)
return (error);
NDFREE(ndp, NDF_ONLY_PNBUF);
/*
* Sanity check on lower vnode
*/
lowerrootvp = ndp->ni_vp;
#ifdef DEBUG
printf("vp = %p, check for VDIR...\n", (void *)lowerrootvp);
#endif
vrele(ndp->ni_dvp);
ndp->ni_dvp = 0;
if (lowerrootvp->v_type != VDIR) {
vput(lowerrootvp);
return (EINVAL);
}
#ifdef DEBUG
printf("mp = %p\n", (void *)mp);
#endif
amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
M_UMAPFSMNT, M_WAITOK); /* XXX */
/*
* Save reference to underlying FS
*/
amp->umapm_vfs = lowerrootvp->v_mount;
/*
* Now copy in the number of entries and maps for umap mapping.
*/
if (args.nentries > MAPFILEENTRIES || args.gnentries >
GMAPFILEENTRIES) {
vput(lowerrootvp);
free(amp, M_UMAPFSMNT);
/* XXX missing error = EINVAL ? */
return (error);
}
amp->info_nentries = args.nentries;
amp->info_gnentries = args.gnentries;
error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
2*sizeof(u_long)*args.nentries);
if (error) {
free(amp, M_UMAPFSMNT);
return (error);
}
#ifdef DEBUG
printf("umap_mount:nentries %d\n",args.nentries);
for (i = 0; i < args.nentries; i++)
printf(" %lu maps to %lu\n", amp->info_mapdata[i][0],
amp->info_mapdata[i][1]);
#endif
error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
2*sizeof(u_long)*args.gnentries);
if (error) {
free(amp, M_UMAPFSMNT);
return (error);
}
#ifdef DEBUG
printf("umap_mount:gnentries %d\n",args.gnentries);
for (i = 0; i < args.gnentries; i++)
printf(" group %lu maps to %lu\n",
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, 0, td);
/*
* Make sure the node alias worked
*/
if (error) {
vrele(lowerrootvp);
free(amp, M_UMAPFSMNT); /* XXX */
return (error);
}
/*
* Keep a held reference to the root vnode.
* It is vrele'd in umapfs_unmount.
*/
ASSERT_VOP_LOCKED(vp, "umapfs_mount");
umapm_rootvp = vp;
umapm_rootvp->v_vflag |= VV_ROOT;
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;
vfs_getnewfsid(mp);
(void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
(void)umapfs_statfs(mp, &mp->mnt_stat, td);
#ifdef DEBUG
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.
*/
static int
umapfs_start(mp, flags, td)
struct mount *mp;
int flags;
struct thread *td;
{
return (0);
/* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, td)); */
}
/*
* Free reference to umap layer
*/
static int
umapfs_unmount(mp, mntflags, td)
struct mount *mp;
int mntflags;
struct thread *td;
{
int error;
int flags = 0;
#ifdef DEBUG
printf("umapfs_unmount(mp = %p)\n", (void *)mp);
#endif
if (mntflags & MNT_FORCE)
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
mntflushbuf(mp, 0);
if (mntinvalbuf(mp, 1))
return (EBUSY);
#endif
/* There is 1 extra root vnode reference (umapm_rootvp). */
error = vflush(mp, 1, flags, td);
if (error)
return (error);
/*
* Finally, throw away the umap_mount structure
*/
free(mp->mnt_data, M_UMAPFSMNT); /* XXX */
mp->mnt_data = 0;
return (0);
}
static int
umapfs_root(mp, vpp, td)
struct mount *mp;
struct vnode **vpp;
struct thread *td;
{
struct thread *td = curthread; /* XXX */
struct vnode *vp;
#ifdef DEBUG
printf("umapfs_root(mp = %p, vp = %p->%p)\n",
(void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
(void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
#endif
/*
* Return locked reference to root.
*/
vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
VREF(vp);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
*vpp = vp;
return (0);
}
static int
umapfs_quotactl(mp, cmd, uid, arg, td)
struct mount *mp;
int cmd;
uid_t uid;
caddr_t arg;
struct thread *td;
{
return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, td));
}
static int
umapfs_statfs(mp, sbp, td)
struct mount *mp;
struct statfs *sbp;
struct thread *td;
{
int error;
struct statfs mstat;
#ifdef DEBUG
printf("umapfs_statfs(mp = %p, vp = %p->%p)\n",
(void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
(void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
#endif
bzero(&mstat, sizeof(mstat));
error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, td);
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);
}
static int
umapfs_vget(mp, ino, flags, vpp)
struct mount *mp;
ino_t ino;
int flags;
struct vnode **vpp;
{
return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, flags, vpp));
}
static int
umapfs_fhtovp(mp, fidp, vpp)
struct mount *mp;
struct fid *fidp;
struct vnode **vpp;
{
return (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, vpp));
}
static int
umapfs_checkexp(mp, nam, exflagsp, credanonp)
struct mount *mp;
struct sockaddr *nam;
int *exflagsp;
struct ucred **credanonp;
{
return (VFS_CHECKEXP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, nam,
exflagsp, credanonp));
}
static int
umapfs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
struct vnode *lvp;
lvp = UMAPVPTOLOWERVP(vp);
return (VFS_VPTOFH(lvp, fhp));
}
static int
umapfs_extattrctl(mp, cmd, filename_vp, namespace, attrname, td)
struct mount *mp;
int cmd;
struct vnode *filename_vp;
int namespace;
const char *attrname;
struct thread *td;
{
return (VFS_EXTATTRCTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd,
filename_vp, namespace, attrname, td));
}
static struct vfsops umap_vfsops = {
.vfs_checkexp = umapfs_checkexp,
.vfs_extattrctl = umapfs_extattrctl,
.vfs_fhtovp = umapfs_fhtovp,
.vfs_init = umapfs_init,
.vfs_omount = umapfs_omount,
.vfs_quotactl = umapfs_quotactl,
.vfs_root = umapfs_root,
.vfs_start = umapfs_start,
.vfs_statfs = umapfs_statfs,
.vfs_unmount = umapfs_unmount,
.vfs_vget = umapfs_vget,
.vfs_vptofh = umapfs_vptofh,
};
VFS_SET(umap_vfsops, umapfs, VFCF_LOOPBACK);