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.
417 lines
9.9 KiB
C
417 lines
9.9 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
|
|
* Jan-Simon Pendry.
|
|
*
|
|
* 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.
|
|
*
|
|
* @(#)null_vfsops.c 8.2 (Berkeley) 1/21/94
|
|
*
|
|
* @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Null Layer
|
|
* (See null_vnops.c for a description of what this does.)
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kdb.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <fs/nullfs/null.h>
|
|
|
|
static MALLOC_DEFINE(M_NULLFSMNT, "NULLFS mount", "NULLFS mount structure");
|
|
|
|
static vfs_fhtovp_t nullfs_fhtovp;
|
|
static vfs_checkexp_t nullfs_checkexp;
|
|
static vfs_mount_t nullfs_mount;
|
|
static vfs_quotactl_t nullfs_quotactl;
|
|
static vfs_root_t nullfs_root;
|
|
static vfs_start_t nullfs_start;
|
|
static vfs_sync_t nullfs_sync;
|
|
static vfs_statfs_t nullfs_statfs;
|
|
static vfs_unmount_t nullfs_unmount;
|
|
static vfs_vget_t nullfs_vget;
|
|
static vfs_vptofh_t nullfs_vptofh;
|
|
static vfs_extattrctl_t nullfs_extattrctl;
|
|
|
|
/*
|
|
* Mount null layer
|
|
*/
|
|
static int
|
|
nullfs_mount(struct mount *mp, struct thread *td)
|
|
{
|
|
int error = 0;
|
|
struct vnode *lowerrootvp, *vp;
|
|
struct vnode *nullm_rootvp;
|
|
struct null_mount *xmp;
|
|
char *target;
|
|
size_t size;
|
|
int isvnunlocked = 0, len;
|
|
struct nameidata nd, *ndp = &nd;
|
|
|
|
NULLFSDEBUG("nullfs_mount(mp = %p)\n", (void *)mp);
|
|
|
|
/*
|
|
* Update is a no-op
|
|
*/
|
|
if (mp->mnt_flag & MNT_UPDATE) {
|
|
return (EOPNOTSUPP);
|
|
/* return VFS_MOUNT(MOUNTTONULLMOUNT(mp)->nullm_vfs, path, data, ndp, td);*/
|
|
}
|
|
|
|
/*
|
|
* Get argument
|
|
*/
|
|
error = vfs_getopt(mp->mnt_optnew, "target", (void **)&target, &len);
|
|
if (error || target[len - 1] != '\0')
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Unlock lower node to avoid deadlock.
|
|
* (XXX) VOP_ISLOCKED is needed?
|
|
*/
|
|
if ((mp->mnt_vnodecovered->v_op == null_vnodeop_p) &&
|
|
VOP_ISLOCKED(mp->mnt_vnodecovered, NULL)) {
|
|
VOP_UNLOCK(mp->mnt_vnodecovered, 0, td);
|
|
isvnunlocked = 1;
|
|
}
|
|
/*
|
|
* Find lower node
|
|
*/
|
|
NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
|
|
UIO_SYSSPACE, target, td);
|
|
error = namei(ndp);
|
|
/*
|
|
* Re-lock vnode.
|
|
*/
|
|
if (isvnunlocked && !VOP_ISLOCKED(mp->mnt_vnodecovered, NULL))
|
|
vn_lock(mp->mnt_vnodecovered, LK_EXCLUSIVE | LK_RETRY, td);
|
|
|
|
if (error)
|
|
return (error);
|
|
NDFREE(ndp, NDF_ONLY_PNBUF);
|
|
|
|
/*
|
|
* Sanity check on lower vnode
|
|
*/
|
|
lowerrootvp = ndp->ni_vp;
|
|
|
|
vrele(ndp->ni_dvp);
|
|
ndp->ni_dvp = NULLVP;
|
|
|
|
/*
|
|
* Check multi null mount to avoid `lock against myself' panic.
|
|
*/
|
|
if (lowerrootvp == VTONULL(mp->mnt_vnodecovered)->null_lowervp) {
|
|
NULLFSDEBUG("nullfs_mount: multi null mount?\n");
|
|
vput(lowerrootvp);
|
|
return (EDEADLK);
|
|
}
|
|
|
|
xmp = (struct null_mount *) malloc(sizeof(struct null_mount),
|
|
M_NULLFSMNT, M_WAITOK); /* XXX */
|
|
|
|
/*
|
|
* Save reference to underlying FS
|
|
*/
|
|
xmp->nullm_vfs = lowerrootvp->v_mount;
|
|
|
|
/*
|
|
* Save reference. Each mount also holds
|
|
* a reference on the root vnode.
|
|
*/
|
|
error = null_nodeget(mp, lowerrootvp, &vp);
|
|
/*
|
|
* Make sure the node alias worked
|
|
*/
|
|
if (error) {
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vrele(lowerrootvp);
|
|
free(xmp, M_NULLFSMNT); /* XXX */
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Keep a held reference to the root vnode.
|
|
* It is vrele'd in nullfs_unmount.
|
|
*/
|
|
nullm_rootvp = vp;
|
|
nullm_rootvp->v_vflag |= VV_ROOT;
|
|
xmp->nullm_rootvp = nullm_rootvp;
|
|
|
|
/*
|
|
* Unlock the node (either the lower or the alias)
|
|
*/
|
|
VOP_UNLOCK(vp, 0, td);
|
|
|
|
if (NULLVPTOLOWERVP(nullm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
|
|
mp->mnt_flag |= MNT_LOCAL;
|
|
mp->mnt_data = (qaddr_t) xmp;
|
|
vfs_getnewfsid(mp);
|
|
|
|
(void) copystr(target, mp->mnt_stat.f_mntfromname,
|
|
MNAMELEN - 1, &size);
|
|
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
|
|
(void)nullfs_statfs(mp, &mp->mnt_stat, td);
|
|
NULLFSDEBUG("nullfs_mount: lower %s, alias at %s\n",
|
|
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
|
|
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
|
|
nullfs_start(mp, flags, td)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct thread *td;
|
|
{
|
|
return (0);
|
|
/* return VFS_START(MOUNTTONULLMOUNT(mp)->nullm_vfs, flags, td); */
|
|
}
|
|
|
|
/*
|
|
* Free reference to null layer
|
|
*/
|
|
static int
|
|
nullfs_unmount(mp, mntflags, td)
|
|
struct mount *mp;
|
|
int mntflags;
|
|
struct thread *td;
|
|
{
|
|
void *mntdata;
|
|
int error;
|
|
int flags = 0;
|
|
|
|
NULLFSDEBUG("nullfs_unmount: mp = %p\n", (void *)mp);
|
|
|
|
if (mntflags & MNT_FORCE)
|
|
flags |= FORCECLOSE;
|
|
|
|
/* There is 1 extra root vnode reference (nullm_rootvp). */
|
|
error = vflush(mp, 1, flags, td);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Finally, throw away the null_mount structure
|
|
*/
|
|
mntdata = mp->mnt_data;
|
|
mp->mnt_data = 0;
|
|
free(mntdata, M_NULLFSMNT);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
nullfs_root(mp, vpp, td)
|
|
struct mount *mp;
|
|
struct vnode **vpp;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp;
|
|
|
|
NULLFSDEBUG("nullfs_root(mp = %p, vp = %p->%p)\n", (void *)mp,
|
|
(void *)MOUNTTONULLMOUNT(mp)->nullm_rootvp,
|
|
(void *)NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp));
|
|
|
|
/*
|
|
* Return locked reference to root.
|
|
*/
|
|
vp = MOUNTTONULLMOUNT(mp)->nullm_rootvp;
|
|
VREF(vp);
|
|
|
|
#ifdef NULLFS_DEBUG
|
|
if (VOP_ISLOCKED(vp, NULL)) {
|
|
kdb_enter("root vnode is locked.\n");
|
|
vrele(vp);
|
|
return (EDEADLK);
|
|
}
|
|
#endif
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
*vpp = vp;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
nullfs_quotactl(mp, cmd, uid, arg, td)
|
|
struct mount *mp;
|
|
int cmd;
|
|
uid_t uid;
|
|
caddr_t arg;
|
|
struct thread *td;
|
|
{
|
|
return VFS_QUOTACTL(MOUNTTONULLMOUNT(mp)->nullm_vfs, cmd, uid, arg, td);
|
|
}
|
|
|
|
static int
|
|
nullfs_statfs(mp, sbp, td)
|
|
struct mount *mp;
|
|
struct statfs *sbp;
|
|
struct thread *td;
|
|
{
|
|
int error;
|
|
struct statfs mstat;
|
|
|
|
NULLFSDEBUG("nullfs_statfs(mp = %p, vp = %p->%p)\n", (void *)mp,
|
|
(void *)MOUNTTONULLMOUNT(mp)->nullm_rootvp,
|
|
(void *)NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp));
|
|
|
|
bzero(&mstat, sizeof(mstat));
|
|
|
|
error = VFS_STATFS(MOUNTTONULLMOUNT(mp)->nullm_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
|
|
nullfs_sync(mp, waitfor, cred, td)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
{
|
|
/*
|
|
* XXX - Assumes no data cached at null layer.
|
|
*/
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
nullfs_vget(mp, ino, flags, vpp)
|
|
struct mount *mp;
|
|
ino_t ino;
|
|
int flags;
|
|
struct vnode **vpp;
|
|
{
|
|
int error;
|
|
error = VFS_VGET(MOUNTTONULLMOUNT(mp)->nullm_vfs, ino, flags, vpp);
|
|
if (error)
|
|
return (error);
|
|
|
|
return (null_nodeget(mp, *vpp, vpp));
|
|
}
|
|
|
|
static int
|
|
nullfs_fhtovp(mp, fidp, vpp)
|
|
struct mount *mp;
|
|
struct fid *fidp;
|
|
struct vnode **vpp;
|
|
{
|
|
int error;
|
|
error = VFS_FHTOVP(MOUNTTONULLMOUNT(mp)->nullm_vfs, fidp, vpp);
|
|
if (error)
|
|
return (error);
|
|
|
|
return (null_nodeget(mp, *vpp, vpp));
|
|
}
|
|
|
|
static int
|
|
nullfs_checkexp(mp, nam, extflagsp, credanonp)
|
|
struct mount *mp;
|
|
struct sockaddr *nam;
|
|
int *extflagsp;
|
|
struct ucred **credanonp;
|
|
{
|
|
|
|
return VFS_CHECKEXP(MOUNTTONULLMOUNT(mp)->nullm_vfs, nam,
|
|
extflagsp, credanonp);
|
|
}
|
|
|
|
static int
|
|
nullfs_vptofh(vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
struct vnode *lvp;
|
|
|
|
lvp = NULLVPTOLOWERVP(vp);
|
|
return VFS_VPTOFH(lvp, fhp);
|
|
}
|
|
|
|
static int
|
|
nullfs_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(MOUNTTONULLMOUNT(mp)->nullm_vfs, cmd, filename_vp,
|
|
namespace, attrname, td);
|
|
}
|
|
|
|
|
|
static struct vfsops null_vfsops = {
|
|
.vfs_checkexp = nullfs_checkexp,
|
|
.vfs_extattrctl = nullfs_extattrctl,
|
|
.vfs_fhtovp = nullfs_fhtovp,
|
|
.vfs_init = nullfs_init,
|
|
.vfs_mount = nullfs_mount,
|
|
.vfs_quotactl = nullfs_quotactl,
|
|
.vfs_root = nullfs_root,
|
|
.vfs_start = nullfs_start,
|
|
.vfs_statfs = nullfs_statfs,
|
|
.vfs_sync = nullfs_sync,
|
|
.vfs_uninit = nullfs_uninit,
|
|
.vfs_unmount = nullfs_unmount,
|
|
.vfs_vget = nullfs_vget,
|
|
.vfs_vptofh = nullfs_vptofh,
|
|
};
|
|
|
|
VFS_SET(null_vfsops, nullfs, VFCF_LOOPBACK);
|