NetBSD/sys/adosfs/advfsops.c

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1995-03-09 15:05:21 +03:00
/* $NetBSD: advfsops.c,v 1.12 1995/03/09 12:06:20 mycroft Exp $ */
/*
* Copyright (c) 1994 Christian E. Hopps
* 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/param.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/mount.h>
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#include <sys/proc.h>
#include <sys/time.h>
#include <sys/malloc.h>
#include <sys/disklabel.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 <adosfs/adosfs.h>
int
adosfs_mount(mp, path, data, ndp, p)
struct mount *mp;
char *path;
caddr_t data;
struct nameidata *ndp;
struct proc *p;
{
struct vnode *devvp;
struct adosfs_args args;
struct adosfsmount *amp;
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size_t size;
int error;
mode_t accessmode;
if (error = copyin(data, (caddr_t)&args, sizeof(struct adosfs_args)))
return(error);
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
if ((mp->mnt_flag & MNT_RDONLY) == 0)
return (EROFS);
/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible block device.
*/
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NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
if (error = namei(ndp))
return (error);
devvp = ndp->ni_vp;
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if (devvp->v_type != VBLK) {
vrele(devvp);
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return (ENOTBLK);
}
if (major(devvp->v_rdev) >= nblkdev) {
vrele(devvp);
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return (ENXIO);
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*/
if (p->p_ucred->cr_uid != 0) {
accessmode = VREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
VOP_LOCK(devvp);
if (error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p)) {
vput(devvp);
return (error);
}
VOP_UNLOCK(devvp);
}
if (error = adosfs_mountfs(devvp, mp, p)) {
vrele(devvp);
return (error);
}
amp = VFSTOADOSFS(mp);
amp->uid = args.uid;
amp->gid = args.gid;
amp->mask = args.mask;
(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
return (0);
}
int
adosfs_mountfs(devvp, mp, p)
struct vnode *devvp;
struct mount *mp;
struct proc *p;
{
struct disklabel dl;
struct partition *parp;
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struct adosfsmount *amp;
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struct vnode *rvp;
int error, part, i;
part = DISKPART(devvp->v_rdev);
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amp = NULL;
/*
* Disallow multiple mounts of the same device.
* Disallow mounting of a device that is currently in use
* (except for root, which might share swap device for miniroot).
* Flush out any old buffers remaining from a previous use.
*/
if (error = vfs_mountedon(devvp))
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return (error);
if (vcount(devvp) > 1 && devvp != rootvp)
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return (EBUSY);
if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0))
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return (error);
/*
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* open blkdev and read root block
*/
if (error = VOP_OPEN(devvp, FREAD, NOCRED, p))
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return (error);
if (error = VOP_IOCTL(devvp, DIOCGDINFO,(caddr_t)&dl, FREAD, NOCRED, p))
goto fail;
parp = &dl.d_partitions[part];
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amp = malloc(sizeof(struct adosfsmount), M_ADOSFSMNT, M_WAITOK);
amp->mp = mp;
amp->startb = parp->p_offset;
amp->endb = parp->p_offset + parp->p_size;
amp->bsize = dl.d_secsize;
amp->nwords = amp->bsize >> 2;
amp->devvp = devvp;
/* amp->rootb = (parp->p_size - 1 + 2) >> 1;*/
amp->rootb = (parp->p_size - 1 + parp->p_cpg) >> 1;
mp->mnt_data = (qaddr_t)amp;
mp->mnt_stat.f_fsid.val[0] = (long)devvp->v_rdev;
mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_ADOSFS);
mp->mnt_flag |= MNT_LOCAL;
devvp->v_specflags |= SI_MOUNTEDON;
/*
* init anode table.
*/
for (i = 0; i < ANODEHASHSZ; i++)
LIST_INIT(&amp->anodetab[i]);
/*
* get the root anode, if not a valid fs this will fail.
*/
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if (error = VFS_ROOT(mp, &rvp))
goto fail;
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vput(rvp);
return(0);
fail:
(void) VOP_CLOSE(devvp, FREAD, NOCRED, p);
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if (amp)
free(amp, M_ADOSFSMNT);
return (error);
}
int
adosfs_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
return (0);
}
int
adosfs_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
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struct adosfsmount *amp;
int error, flags;
flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
if (error = vflush(mp, NULLVP, flags))
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return (error);
amp = VFSTOADOSFS(mp);
amp->devvp->v_specflags &= ~SI_MOUNTEDON;
error = VOP_CLOSE(amp->devvp, FREAD, NOCRED, p);
vrele(amp->devvp);
free(amp, M_ADOSFSMNT);
mp->mnt_data = (qaddr_t)0;
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mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}
int
adosfs_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
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struct vnode *nvp;
int error;
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if (error = VFS_VGET(mp, (ino_t)VFSTOADOSFS(mp)->rootb, &nvp))
return (error);
*vpp = nvp;
return (0);
}
int
adosfs_statfs(mp, sbp, p)
struct mount *mp;
struct statfs *sbp;
struct proc *p;
{
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struct adosfsmount *amp;
amp = VFSTOADOSFS(mp);
sbp->f_type = 0;
sbp->f_bsize = amp->bsize;
sbp->f_iosize = amp->bsize;
sbp->f_blocks = 2; /* XXX */
sbp->f_bfree = 0; /* none */
sbp->f_bavail = 0; /* none */
sbp->f_files = 0; /* who knows */
sbp->f_ffree = 0; /* " " */
if (sbp != &mp->mnt_stat) {
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
}
strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
sbp->f_fstypename[MFSNAMELEN] = 0;
return (0);
}
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/*
* lookup an anode, check mount's hash table if not found, create
* return locked and referenced al la vget(vp, 1);
*/
int
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adosfs_vget(mp, an, vpp)
struct mount *mp;
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ino_t an;
struct vnode **vpp;
{
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struct adosfsmount *amp;
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struct vnode *vp;
struct anode *ap;
struct buf *bp;
char *nam, *tmp;
int namlen, error, tmplen;
error = 0;
amp = VFSTOADOSFS(mp);
bp = NULL;
/*
* check hash table. we are done if found
*/
if (*vpp = adosfs_ahashget(mp, an))
return (0);
if (error = getnewvnode(VT_ADOSFS, mp, adosfs_vnodeop_p, &vp))
return (error);
/*
* setup, insert in hash, and lock before io.
*/
vp->v_data = ap = malloc(sizeof(struct anode), M_ANODE, M_WAITOK);
bzero(ap, sizeof(struct anode));
ap->vp = vp;
ap->amp = amp;
ap->block = an;
ap->nwords = amp->nwords;
adosfs_ainshash(amp, ap);
if (error = bread(amp->devvp, an, amp->bsize, NOCRED, &bp)) {
vput(vp);
return (error);
}
/*
* get type and fill rest in based on that.
*/
switch (ap->type = adosfs_getblktype(amp, bp)) {
case AROOT:
vp->v_type = VDIR;
vp->v_flag |= VROOT;
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:
vp->v_type = VDIR;
break;
case ADIR:
vp->v_type = VDIR;
break;
case ALFILE:
vp->v_type = VREG;
ap->fsize = adoswordn(bp, ap->nwords - 47);
break;
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 = bp->b_data + (6 * sizeof(long));
tmplen = namlen = *(u_char *)nam++;
tmp = nam;
while (tmplen-- && *tmp != ':')
tmp++;
if (*tmp == 0) {
ap->slinkto = malloc(namlen + 1, M_ANODE, M_WAITOK);
bcopy(nam, ap->slinkto, namlen);
} else if (*nam == ':') {
ap->slinkto = malloc(namlen + 1, M_ANODE, M_WAITOK);
bcopy(nam, ap->slinkto, namlen);
ap->slinkto[0] = '/';
} else {
ap->slinkto = malloc(namlen + 2, M_ANODE, M_WAITOK);
ap->slinkto[0] = '/';
bcopy(nam, &ap->slinkto[1], namlen);
ap->slinkto[tmp - nam + 1] = '/';
namlen++;
}
ap->slinkto[namlen] = 0;
break;
default:
brelse(bp);
vput(vp);
return (EINVAL);
}
/*
* 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];
bzero(ap->tabi, 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;
else if (ap->type == ALFILE)
ap->lastindblk = ap->linkto;
if (ap->type == AROOT) {
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ap->adprot = 0;
ap->uid = amp->uid;
ap->gid = amp->gid;
} else {
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ap->adprot = adoswordn(bp, ap->nwords - 48);
/*
* 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;
}
}
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ap->mtime.days = adoswordn(bp, ap->nwords - 23);
ap->mtime.mins = adoswordn(bp, ap->nwords - 22);
ap->mtime.ticks = adoswordn(bp, ap->nwords - 21);
/*
* copy in name
*/
nam = bp->b_data + (ap->nwords - 20) * sizeof(long);
namlen = *(u_char *)nam++;
if (namlen > 30) {
#ifdef DIAGNOSTIC
printf("adosfs: aget: name length too long blk %d\n", an);
#endif
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brelse(bp);
vput(vp);
return (EINVAL);
}
bcopy(nam, ap->name, namlen);
ap->name[namlen] = 0;
*vpp = vp; /* return vp */
brelse(bp); /* release buffer */
return (0);
}
int
adosfs_fhtovp(mp, fhp, vpp)
struct mount *mp;
struct fid *fhp;
struct vnode **vpp;
{
#ifdef ADOSFS_DIAGNOSTIC
printf("adfhtovp(%x, %x, %x)\n", mp, fhp, vpp);
#endif
return(0);
}
int
adosfs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
#ifdef ADOSFS_DIAGNOSTIC
printf("advptofh(%x, %x)\n", vp, fhp);
#endif
return(0);
}
int
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adosfs_quotactl(mp, cmds, uid, arg, p)
struct mount *mp;
int cmds;
uid_t uid;
caddr_t arg;
struct proc *p;
{
return(EOPNOTSUPP);
}
int
adosfs_sync(mp, waitfor)
struct mount *mp;
int waitfor;
{
#ifdef ADOSFS_DIAGNOSTIC
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printf("ad_sync(%x, %x)\n", mp, waitfor);
#endif
return(0);
}
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int
adosfs_init()
{
return(0);
}
/*
* vfs generic function call table
*/
struct vfsops adosfs_vfsops = {
MOUNT_ADOSFS,
adosfs_mount,
adosfs_start,
adosfs_unmount,
adosfs_root,
adosfs_quotactl,
adosfs_statfs,
adosfs_sync,
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adosfs_vget,
adosfs_fhtovp,
adosfs_vptofh,
adosfs_init,
};