5e8c582ac2
and refuse initializing filesystems with a wrong version. This will aid maintenance activites on the 5-stable branch. s/vfs_mount/vfs_omount/ s/vfs_nmount/vfs_mount/ Name our filesystems mount function consistently. Eliminate the namiedata argument to both vfs_mount and vfs_omount. It was originally there to save stack space. A few places abused it to get hold of some credentials to pass around. Effectively it is unused. Reorganize the root filesystem selection code.
444 lines
10 KiB
C
444 lines
10 KiB
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
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* 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);
|