/* $NetBSD: advfsops.c,v 1.80 2021/12/05 04:47:17 msaitoh Exp $ */

/* $NetBSD: advfsops.c,v 1.80 2021/12/05 04:47:17 msaitoh Exp $ */

/*
* Copyright (c) 1994 Christian E. Hopps
* Copyright (c) 1996 Matthias Scheler
* All rights reserved.
*
* 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 Christian E. Hopps.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: advfsops.c,v 1.80 2021/12/05 04:47:17 msaitoh Exp $");

#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/time.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h> /* XXX */
#include <sys/fcntl.h>
#include <sys/namei.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/kauth.h>
#include <sys/module.h>
#include <fs/adosfs/adosfs.h>

MODULE(MODULE_CLASS_VFS, adosfs, NULL);

VFS_PROTOS(adosfs);

int adosfs_mountfs(struct vnode *, struct mount *, struct lwp *);
int adosfs_loadbitmap(struct adosfsmount *);

struct pool adosfs_node_pool;

MALLOC_JUSTDEFINE(M_ANODE, "adosfs anode","adosfs anode structures and tables");

static const struct genfs_ops adosfs_genfsops = {
.gop_size = genfs_size,
};

int (**adosfs_vnodeop_p)(void *);

int
adosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
struct lwp *l = curlwp;
struct vnode *devvp;
struct adosfs_args *args = data;
struct adosfsmount *amp;
int error;
mode_t accessmode;

if (args == NULL)
return EINVAL;
if (*data_len < sizeof *args)
return EINVAL;

if (mp->mnt_flag & MNT_GETARGS) {
amp = VFSTOADOSFS(mp);
if (amp == NULL)
return EIO;
args->uid = amp->uid;
args->gid = amp->gid;
args->mask = amp->mask;
args->fspec = NULL;
*data_len = sizeof *args;
return 0;
}

if ((mp->mnt_flag & MNT_RDONLY) == 0)
return (EROFS);

if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL)
return EOPNOTSUPP;

/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible block device.
*/
error = namei_simple_user(args->fspec,
NSM_FOLLOW_NOEMULROOT, &devvp);
if (error != 0)
return (error);

if (devvp->v_type != VBLK) {
vrele(devvp);
return (ENOTBLK);
}
if (bdevsw_lookup(devvp->v_rdev) == NULL) {
vrele(devvp);
return (ENXIO);
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*/
accessmode = VREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode));
VOP_UNLOCK(devvp);
if (error) {
vrele(devvp);
return (error);
}
/* MNT_UPDATE? */
if ((error = adosfs_mountfs(devvp, mp, l)) != 0) {
vrele(devvp);
return (error);
}
amp = VFSTOADOSFS(mp);
amp->uid = args->uid;
amp->gid = args->gid;
amp->mask = args->mask;
return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
mp->mnt_op->vfs_name, mp, l);
}

int
adosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
{
struct disklabel dl;
struct partition *parp;
struct adosfsmount *amp;
struct buf *bp;
struct vnode *rvp;
size_t bitmap_sz = 0;
int error;
uint64_t numsecs;
unsigned secsize;
unsigned long secsperblk, blksperdisk, resvblks;

amp = NULL;

if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0)
return (error);

/*
* open blkdev and read boot and root block
*/
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
if ((error = VOP_OPEN(devvp, FREAD, NOCRED)) != 0) {
VOP_UNLOCK(devvp);
return (error);
}

error = getdisksize(devvp, &numsecs, &secsize);
if (error)
goto fail;

amp = kmem_zalloc(sizeof(struct adosfsmount), KM_SLEEP);

/*
* compute filesystem parameters from disklabel
* on arch/amiga the disklabel is computed from the native
* partition tables
* - p_fsize is the filesystem block size
* - p_frag is the number of sectors per filesystem block
* - p_cpg is the number of reserved blocks (boot blocks)
* - p_psize is reduced by the number of preallocated blocks
* at the end of a partition
*
* XXX
* - bsize and secsperblk could be computed from the first sector
* of the root block
* - resvblks (the number of boot blocks) can only be guessed
* by scanning for the root block as its position moves
* with resvblks
*/
error = VOP_IOCTL(devvp, DIOCGDINFO, &dl, FREAD, NOCRED);
VOP_UNLOCK(devvp);
if (error)
goto fail;
parp = &dl.d_partitions[DISKPART(devvp->v_rdev)];
if (dl.d_type == DKTYPE_FLOPPY) {
amp->bsize = secsize;
secsperblk = 1;
resvblks = 2;
} else if (parp->p_fsize > 0 && parp->p_frag > 0) {
amp->bsize = parp->p_fsize * parp->p_frag;
secsperblk = parp->p_frag;
resvblks = parp->p_cpg;
} else {
error = EINVAL;
goto fail;
}
blksperdisk = numsecs / secsperblk;

/* The filesystem variant ('dostype') is stored in the boot block */
bp = NULL;
if ((error = bread(devvp, (daddr_t)BBOFF,
amp->bsize, 0, &bp)) != 0) {
goto fail;
}
amp->dostype = adoswordn(bp, 0);
brelse(bp, 0);

/* basic sanity checks */
if (amp->dostype < 0x444f5300 || amp->dostype > 0x444f5305) {
error = EINVAL;
goto fail;
}

amp->rootb = (blksperdisk - 1 + resvblks) / 2;
amp->numblks = blksperdisk - resvblks;

amp->nwords = amp->bsize >> 2;
amp->dbsize = amp->bsize - (IS_FFS(amp) ? 0 : OFS_DATA_OFFSET);
amp->devvp = devvp;

amp->mp = mp;
mp->mnt_data = amp;
mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev;
mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_ADOSFS);
mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
mp->mnt_stat.f_namemax = ADMAXNAMELEN;
mp->mnt_fs_bshift = ffs(amp->bsize) - 1;
mp->mnt_dev_bshift = DEV_BSHIFT;
mp->mnt_flag |= MNT_LOCAL;

/*
* get the root anode, if not a valid fs this will fail.
*/
if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp)) != 0)
goto fail;
/* allocate and load bitmap, set free space */
bitmap_sz = ((amp->numblks + 31) / 32) * sizeof(*amp->bitmap);
amp->bitmap = kmem_alloc(bitmap_sz, KM_SLEEP);
adosfs_loadbitmap(amp);
if (mp->mnt_flag & MNT_RDONLY) {
/*
* Don't need the bitmap any more if it's read-only.
*/
kmem_free(amp->bitmap, bitmap_sz);
amp->bitmap = NULL;
}
vput(rvp);

return(0);

fail:
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
(void) VOP_CLOSE(devvp, FREAD, NOCRED);
VOP_UNLOCK(devvp);
if (amp && amp->bitmap)
kmem_free(amp->bitmap, bitmap_sz);
if (amp)
kmem_free(amp, sizeof(*amp));
return (error);
}

int
adosfs_start(struct mount *mp, int flags)
{

return (0);
}

int
adosfs_unmount(struct mount *mp, int mntflags)
{
struct adosfsmount *amp;
int error, flags;

flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
if ((error = vflush(mp, NULLVP, flags)) != 0)
return (error);
amp = VFSTOADOSFS(mp);
if (amp->devvp->v_type != VBAD)
spec_node_setmountedfs(amp->devvp, NULL);
vn_lock(amp->devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_CLOSE(amp->devvp, FREAD, NOCRED);
vput(amp->devvp);
if (amp->bitmap) {
size_t bitmap_sz = ((amp->numblks + 31) / 32) *
sizeof(*amp->bitmap);
kmem_free(amp->bitmap, bitmap_sz);
}
kmem_free(amp, sizeof(*amp));
mp->mnt_data = NULL;
mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}

int
adosfs_root(struct mount *mp, int lktype, struct vnode **vpp)
{
struct vnode *nvp;
int error;

error = VFS_VGET(mp, (ino_t)VFSTOADOSFS(mp)->rootb, lktype, &nvp);
if (error != 0)
return (error);
/* XXX verify it's a root block? */
*vpp = nvp;
return (0);
}

int
adosfs_statvfs(struct mount *mp, struct statvfs *sbp)
{
struct adosfsmount *amp;

amp = VFSTOADOSFS(mp);
sbp->f_bsize = amp->bsize;
sbp->f_frsize = amp->bsize;
sbp->f_iosize = amp->dbsize;
sbp->f_blocks = amp->numblks;
sbp->f_bfree = amp->freeblks;
sbp->f_bavail = amp->freeblks;
sbp->f_bresvd = 0;
sbp->f_files = 0; /* who knows */
sbp->f_ffree = 0; /* " " */
sbp->f_favail = 0; /* " " */
sbp->f_fresvd = 0;
copy_statvfs_info(sbp, mp);
return (0);
}

/*
* lookup an anode, if not found, create
* return locked and referenced
*/
int
adosfs_vget(struct mount *mp, ino_t an, int lktype, struct vnode **vpp)
{
u_long block;
int error;

block = an;
KASSERT(block == an);
error = vcache_get(mp, &block, sizeof(block), vpp);
if (error)
return error;
error = vn_lock(*vpp, lktype);
if (error) {
vrele(*vpp);
*vpp = NULL;
return error;
}
return 0;
}

/*
* Initialize this vnode / anode pair.
* Caller assures no other thread will try to load this inode.
*/
int
adosfs_loadvnode(struct mount *mp, struct vnode *vp,
const void *key, size_t key_len, const void **new_key)
{
struct adosfsmount *amp;
struct anode *ap;
struct buf *bp;
u_long an;
char *nam, *tmp;
int namlen, error;

KASSERT(key_len == sizeof(an));
memcpy(&an, key, key_len);
amp = VFSTOADOSFS(mp);

if ((error = bread(amp->devvp, an * amp->bsize / DEV_BSIZE,
amp->bsize, 0, &bp)) != 0)
return error;

ap = pool_get(&adosfs_node_pool, PR_WAITOK);
memset(ap, 0, sizeof(struct anode));
ap->vp = vp;
ap->amp = amp;
ap->block = an;
ap->nwords = amp->nwords;

/*
* get type and fill rest in based on that.
*/
switch (ap->type = adosfs_getblktype(amp, bp)) {
case AROOT:
vp->v_type = VDIR;
vp->v_vflag |= VV_ROOT;
ap->mtimev.days = adoswordn(bp, ap->nwords - 10);
ap->mtimev.mins = adoswordn(bp, ap->nwords - 9);
ap->mtimev.ticks = adoswordn(bp, ap->nwords - 8);
ap->created.days = adoswordn(bp, ap->nwords - 7);
ap->created.mins = adoswordn(bp, ap->nwords - 6);
ap->created.ticks = adoswordn(bp, ap->nwords - 5);
break;
case ALDIR:
case ADIR:
vp->v_type = VDIR;
break;
case ALFILE:
case AFILE:
vp->v_type = VREG;
ap->fsize = adoswordn(bp, ap->nwords - 47);
break;
case ASLINK: /* XXX soft link */
vp->v_type = VLNK;
/*
* convert from BCPL string and
* from: "part:dir/file" to: "/part/dir/file"
*/
nam = (char *)bp->b_data + (6 * sizeof(long));
namlen = strlen(nam);
tmp = nam;
while (*tmp && *tmp != ':')
tmp++;
if (*tmp == 0) {
ap->slinkto = malloc(namlen + 1, M_ANODE, M_WAITOK);
memcpy(ap->slinkto, nam, namlen);
} else if (*nam == ':') {
ap->slinkto = malloc(namlen + 1, M_ANODE, M_WAITOK);
memcpy(ap->slinkto, nam, namlen);
ap->slinkto[0] = '/';
} else {
ap->slinkto = malloc(namlen + 2, M_ANODE, M_WAITOK);
ap->slinkto[0] = '/';
memcpy(&ap->slinkto[1], nam, namlen);
ap->slinkto[tmp - nam + 1] = '/';
namlen++;
}
ap->slinkto[namlen] = 0;
ap->fsize = namlen;
break;
default:
error = EINVAL;
goto bad;
}

/*
* Get appropriate data from this block; hard link needs
* to get other data from the "real" block.
*/

/*
* copy in name (from original block)
*/
nam = (char *)bp->b_data + (ap->nwords - 20) * sizeof(u_int32_t);
namlen = *(u_char *)nam++;
if (namlen > 30) {
#ifdef DIAGNOSTIC
printf("adosfs: aget: name length too long blk %llu\n",
(unsigned long long)an);
#endif
error = EINVAL;
goto bad;
}
memcpy(ap->name, nam, namlen);
ap->name[namlen] = 0;

/*
* if dir alloc hash table and copy it in
*/
if (vp->v_type == VDIR) {
int i;

ap->tab = malloc(ANODETABSZ(ap) * 2, M_ANODE, M_WAITOK);
ap->ntabent = ANODETABENT(ap);
ap->tabi = (int *)&ap->tab[ap->ntabent];
memset(ap->tabi, 0, ANODETABSZ(ap));
for (i = 0; i < ap->ntabent; i++)
ap->tab[i] = adoswordn(bp, i + 6);
}

/*
* misc.
*/
ap->pblock = adoswordn(bp, ap->nwords - 3);
ap->hashf = adoswordn(bp, ap->nwords - 4);
ap->linknext = adoswordn(bp, ap->nwords - 10);
ap->linkto = adoswordn(bp, ap->nwords - 11);

/*
* setup last indirect block cache.
*/
ap->lastlindblk = 0;
if (ap->type == AFILE) {
ap->lastindblk = ap->block;
if (adoswordn(bp, ap->nwords - 10))
ap->linkto = ap->block;
} else if (ap->type == ALFILE) {
ap->lastindblk = ap->linkto;
brelse(bp, 0);
bp = NULL;
error = bread(amp->devvp, ap->linkto * amp->bsize / DEV_BSIZE,
amp->bsize, 0, &bp);
if (error)
goto bad;
ap->fsize = adoswordn(bp, ap->nwords - 47);
}

if (ap->type == AROOT) {
ap->adprot = 15;
ap->uid = amp->uid;
ap->gid = amp->gid;
} else {
ap->adprot = adoswordn(bp, ap->nwords - 48) ^ 15;
/*
* ADOS directories do not have a `x' protection bit as
* it is known in VFS; this functionality is fulfilled
* by the ADOS `r' bit.
*
* To retain the ADOS behaviour, fake execute permissions
* in that case.
*/
if ((ap->type == ADIR || ap->type == ALDIR) &&
(ap->adprot & 0x00000008) == 0)
ap->adprot &= ~0x00000002;

/*
* Get uid/gid from extensions in file header
* (really need to know if this is a muFS partition)
*/
ap->uid = (adoswordn(bp, ap->nwords - 49) >> 16) & 0xffff;
ap->gid = adoswordn(bp, ap->nwords - 49) & 0xffff;
if (ap->uid || ap->gid) {
if (ap->uid == 0xffff)
ap->uid = 0;
if (ap->gid == 0xffff)
ap->gid = 0;
ap->adprot |= 0x40000000; /* Kludge */
}
else {
/*
* uid & gid extension don't exist,
* so use the mount-point uid/gid
*/
ap->uid = amp->uid;
ap->gid = amp->gid;
}
}
ap->mtime.days = adoswordn(bp, ap->nwords - 23);
ap->mtime.mins = adoswordn(bp, ap->nwords - 22);
ap->mtime.ticks = adoswordn(bp, ap->nwords - 21);

brelse(bp, 0);
vp->v_tag = VT_ADOSFS;
vp->v_op = adosfs_vnodeop_p;
vp->v_data = ap;
genfs_node_init(vp, &adosfs_genfsops);
uvm_vnp_setsize(vp, ap->fsize);
*new_key = &ap->block;
return 0;

bad:
if (bp)
brelse(bp, 0);
pool_put(&adosfs_node_pool, ap);
return error;
}

/*
* Load the bitmap into memory, and count the number of available
* blocks.
* The bitmap will be released if the filesystem is read-only; it's
* only needed to find the free space.
*/
int
adosfs_loadbitmap(struct adosfsmount *amp)
{
struct buf *bp, *mapbp;
u_long bn;
int blkix, endix, mapix;
int bmsize;
int error;

bp = mapbp = NULL;
bn = amp->rootb;
if ((error = bread(amp->devvp, bn * amp->bsize / DEV_BSIZE, amp->bsize,
0, &bp)) != 0) {
return (error);
}
blkix = amp->nwords - 49;
endix = amp->nwords - 24;
mapix = 0;
bmsize = (amp->numblks + 31) / 32;
while (mapix < bmsize) {
int n;
u_long bits;

if (adoswordn(bp, blkix) == 0)
break;
if (mapbp != NULL)
brelse(mapbp, 0);
if ((error = bread(amp->devvp,
adoswordn(bp, blkix) * amp->bsize / DEV_BSIZE, amp->bsize,
0, &mapbp)) != 0)
break;
if (adoscksum(mapbp, amp->nwords)) {
#ifdef DIAGNOSTIC
printf("adosfs: loadbitmap - cksum of blk %d failed\n",
adoswordn(bp, blkix));
#endif
/* XXX Force read-only? Set free space 0? */
break;
}
n = 1;
while (n < amp->nwords && mapix < bmsize) {
amp->bitmap[mapix++] = bits = adoswordn(mapbp, n);
++n;
if (mapix == bmsize && amp->numblks & 31)
bits &= ~(0xffffffff << (amp->numblks & 31));
while (bits) {
if (bits & 1)
++amp->freeblks;
bits >>= 1;
}
}
++blkix;
if (mapix < bmsize && blkix == endix) {
bn = adoswordn(bp, blkix);
brelse(bp, 0);
if ((error = bread(amp->devvp, bn * amp->bsize / DEV_BSIZE,
amp->bsize, 0, &bp)) != 0)
break;
/*
* Why is there no checksum on these blocks?
*/
blkix = 0;
endix = amp->nwords - 1;
}
}
if (bp)
brelse(bp, 0);
if (mapbp)
brelse(mapbp, 0);
return (error);
}

/*
* File handle to vnode
*
* Have to be really careful about stale file handles:
* - check that the inode number is in range
* - call iget() to get the locked inode
* - check for an unallocated inode (i_mode == 0)
* - check that the generation number matches
*/

struct ifid {
ushort ifid_len;
ushort ifid_pad;
int ifid_ino;
long ifid_start;
};

int
adosfs_fhtovp(struct mount *mp, struct fid *fhp, int lktype,
struct vnode **vpp)
{
struct ifid ifh;
#if 0
struct anode *ap;
#endif
struct vnode *nvp;
int error;

if (fhp->fid_len != sizeof(struct ifid))
return EINVAL;

#ifdef ADOSFS_DIAGNOSTIC
printf("adfhtovp(%p, %p, %p)\n", mp, fhp, vpp);
#endif

memcpy(&ifh, fhp, sizeof(ifh));

if ((error = VFS_VGET(mp, ifh.ifid_ino, lktype, &nvp)) != 0) {
*vpp = NULLVP;
return (error);
}
#if 0
ap = VTOA(nvp);
if (ap->inode.iso_mode == 0) {
vput(nvp);
*vpp = NULLVP;
return (ESTALE);
}
#endif
*vpp = nvp;
return(0);
}

int
adosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size)
{
struct anode *ap = VTOA(vp);
struct ifid ifh;

if (*fh_size < sizeof(struct ifid)) {
*fh_size = sizeof(struct ifid);
return E2BIG;
}
*fh_size = sizeof(struct ifid);

memset(&ifh, 0, sizeof(ifh));
ifh.ifid_len = sizeof(struct ifid);
ifh.ifid_ino = ap->block;
ifh.ifid_start = ap->block;
memcpy(fhp, &ifh, sizeof(ifh));

#ifdef ADOSFS_DIAGNOSTIC
printf("advptofh(%p, %p)\n", vp, fhp);
#endif
return(0);
}

int
adosfs_sync(struct mount *mp, int waitfor, kauth_cred_t uc)
{
#ifdef ADOSFS_DIAGNOSTIC
printf("ad_sync(%p, %d)\n", mp, waitfor);
#endif
return(0);
}

void
adosfs_init(void)
{

malloc_type_attach(M_ANODE);
pool_init(&adosfs_node_pool, sizeof(struct anode), 0, 0, 0, "adosndpl",
&pool_allocator_nointr, IPL_NONE);
}

void
adosfs_done(void)
{

pool_destroy(&adosfs_node_pool);
malloc_type_detach(M_ANODE);
}

/*
* vfs generic function call table
*/

extern const struct vnodeopv_desc adosfs_vnodeop_opv_desc;

const struct vnodeopv_desc *adosfs_vnodeopv_descs[] = {
&adosfs_vnodeop_opv_desc,
NULL,
};

struct vfsops adosfs_vfsops = {
.vfs_name = MOUNT_ADOSFS,
.vfs_min_mount_data = sizeof (struct adosfs_args),
.vfs_mount = adosfs_mount,
.vfs_start = adosfs_start,
.vfs_unmount = adosfs_unmount,
.vfs_root = adosfs_root,
.vfs_quotactl = (void *)eopnotsupp,
.vfs_statvfs = adosfs_statvfs,
.vfs_sync = adosfs_sync,
.vfs_vget = adosfs_vget,
.vfs_loadvnode = adosfs_loadvnode,
.vfs_fhtovp = adosfs_fhtovp,
.vfs_vptofh = adosfs_vptofh,
.vfs_init = adosfs_init,
.vfs_done = adosfs_done,
.vfs_snapshot = (void *)eopnotsupp,
.vfs_extattrctl = vfs_stdextattrctl,
.vfs_suspendctl = genfs_suspendctl,
.vfs_renamelock_enter = genfs_renamelock_enter,
.vfs_renamelock_exit = genfs_renamelock_exit,
.vfs_fsync = (void *)eopnotsupp,
.vfs_opv_descs = adosfs_vnodeopv_descs
};

SYSCTL_SETUP(adosfs_sysctl_setup, "adosfs sysctl")
{ sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "adosfs",
SYSCTL_DESCR("AmigaDOS file system"),
NULL, 0, NULL, 0,
CTL_VFS, 16, CTL_EOL);
}

static int
adosfs_modcmd(modcmd_t cmd, void *arg)
{
int error;

switch (cmd) {
case MODULE_CMD_INIT:
error = vfs_attach(&adosfs_vfsops);
if (error != 0)
break;
/*
* XXX the "16" above could be dynamic, thereby eliminating
* one more instance of the "number to vfs" mapping problem,
* but "16" is the order as taken from sys/mount.h
*/
break;
case MODULE_CMD_FINI:
error = vfs_detach(&adosfs_vfsops);
if (error != 0)
break;
break;
default:
error = ENOTTY;
break;
}

return (error);
}