freebsd-dev/sys/isofs/cd9660/cd9660_vfsops.c
David Greenman 628641f8a6 Converted mountlist to a CIRCLEQ.
Partially obtained from: 4.4BSD-Lite2
1995-08-11 11:31:18 +00:00

703 lines
17 KiB
C

/*-
* Copyright (c) 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley
* by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
* Support code is derived from software contributed to Berkeley
* by Atsushi Murai (amurai@spec.co.jp).
*
* 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 the University of
* California, Berkeley and its contributors.
* 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.
*
* @(#)cd9660_vfsops.c 8.3 (Berkeley) 1/31/94
* $Id: cd9660_vfsops.c,v 1.13 1995/05/30 08:05:03 rgrimes Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <miscfs/specfs/specdev.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <isofs/cd9660/iso.h>
#include <isofs/cd9660/cd9660_node.h>
#include <isofs/cd9660/iso_rrip.h>
struct vfsops cd9660_vfsops = {
cd9660_mount,
cd9660_start,
cd9660_unmount,
cd9660_root,
cd9660_quotactl,
cd9660_statfs,
cd9660_sync,
cd9660_vget,
cd9660_fhtovp,
cd9660_vptofh,
cd9660_init,
};
VFS_SET(cd9660_vfsops, cd9660, MOUNT_CD9660, VFCF_READONLY);
/*
* Called by vfs_mountroot when iso is going to be mounted as root.
*
* Name is updated by mount(8) after booting.
*/
#define ROOTNAME "root_device"
static int iso_mountfs __P((struct vnode *devvp, struct mount *mp,
struct proc *p, struct iso_args *argp));
int
cd9660_mountroot()
{
register struct mount *mp;
struct proc *p = curproc; /* XXX */
struct iso_mnt *imp;
u_int size;
int error;
struct iso_args args;
/*
* Get vnode for rootdev.
*/
if (bdevvp(rootdev, &rootvp))
panic("cd9660_mountroot: can't setup bdevvp for rootdev");
mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
bzero((char *)mp, (u_long)sizeof(struct mount));
mp->mnt_op = &cd9660_vfsops;
mp->mnt_flag = MNT_RDONLY;
args.flags = ISOFSMNT_ROOT;
if ((error = iso_mountfs(rootvp, mp, p, &args))) {
free(mp, M_MOUNT);
return (error);
}
if ((error = vfs_lock(mp))) {
(void)cd9660_unmount(mp, 0, p);
free(mp, M_MOUNT);
return (error);
}
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
mp->mnt_flag |= MNT_ROOTFS;
mp->mnt_vnodecovered = NULLVP;
imp = VFSTOISOFS(mp);
bzero(imp->im_fsmnt, sizeof(imp->im_fsmnt));
imp->im_fsmnt[0] = '/';
bcopy((caddr_t)imp->im_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
MNAMELEN);
(void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
(void) cd9660_statfs(mp, &mp->mnt_stat, p);
vfs_unlock(mp);
return (0);
}
/*
* Flag to allow forcible unmounting.
*/
int iso_doforce = 1;
/*
* VFS Operations.
*
* mount system call
*/
int
cd9660_mount(mp, path, data, ndp, p)
register struct mount *mp;
char *path;
caddr_t data;
struct nameidata *ndp;
struct proc *p;
{
struct vnode *devvp;
struct iso_args args;
u_int size;
int error;
struct iso_mnt *imp = 0;
if ((error = copyin(data, (caddr_t)&args, sizeof (struct iso_args))))
return (error);
if ((mp->mnt_flag & MNT_RDONLY) == 0)
return (EROFS);
/*
* If updating, check whether changing from read-only to
* read/write; if there is no device name, that's all we do.
*/
if (mp->mnt_flag & MNT_UPDATE) {
imp = VFSTOISOFS(mp);
if (args.fspec == 0)
return (vfs_export(mp, &imp->im_export, &args.export));
}
/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible block device.
*/
NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
if ((error = namei(ndp)))
return (error);
devvp = ndp->ni_vp;
if (devvp->v_type != VBLK) {
vrele(devvp);
return ENOTBLK;
}
if (major(devvp->v_rdev) >= nblkdev) {
vrele(devvp);
return ENXIO;
}
if ((mp->mnt_flag & MNT_UPDATE) == 0)
error = iso_mountfs(devvp, mp, p, &args);
else {
if (devvp != imp->im_devvp)
error = EINVAL; /* needs translation */
else
vrele(devvp);
}
if (error) {
vrele(devvp);
return error;
}
imp = VFSTOISOFS(mp);
(void) copyinstr(path, imp->im_fsmnt, sizeof(imp->im_fsmnt)-1, &size);
bzero(imp->im_fsmnt + size, sizeof(imp->im_fsmnt) - size);
bcopy((caddr_t)imp->im_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
MNAMELEN);
(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
(void) cd9660_statfs(mp, &mp->mnt_stat, p);
return 0;
}
/*
* Common code for mount and mountroot
*/
static int
iso_mountfs(devvp, mp, p, argp)
register struct vnode *devvp;
struct mount *mp;
struct proc *p;
struct iso_args *argp;
{
register struct iso_mnt *isomp = (struct iso_mnt *)0;
struct buf *bp = NULL;
dev_t dev = devvp->v_rdev;
int error = EINVAL;
int needclose = 0;
int high_sierra = 0;
int ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
int iso_bsize;
int iso_blknum;
struct iso_volume_descriptor *vdp;
struct iso_primary_descriptor *pri;
struct iso_sierra_primary_descriptor *pri_sierra;
struct iso_directory_record *rootp;
int logical_block_size;
if (!ronly)
return EROFS;
/*
* 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)))
return error;
if (vcount(devvp) > 1 && devvp != rootvp)
return EBUSY;
if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)))
return (error);
if ((error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p)))
return error;
needclose = 1;
/* This is the "logical sector size". The standard says this
* should be 2048 or the physical sector size on the device,
* whichever is greater. For now, we'll just use a constant.
*/
iso_bsize = ISO_DEFAULT_BLOCK_SIZE;
for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) {
if ((error = bread (devvp, btodb(iso_blknum * iso_bsize),
iso_bsize, NOCRED, &bp)))
goto out;
vdp = (struct iso_volume_descriptor *)bp->b_un.b_addr;
if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
sizeof vdp->id) != 0) {
error = EINVAL;
goto out;
} else
high_sierra = 1;
}
if (isonum_711 (high_sierra? vdp->type_sierra: vdp->type) == ISO_VD_END) {
error = EINVAL;
goto out;
}
if (isonum_711 (high_sierra? vdp->type_sierra: vdp->type) == ISO_VD_PRIMARY)
break;
brelse(bp);
}
if (isonum_711 (high_sierra? vdp->type_sierra: vdp->type) != ISO_VD_PRIMARY) {
error = EINVAL;
goto out;
}
pri = (struct iso_primary_descriptor *)vdp;
pri_sierra = (struct iso_sierra_primary_descriptor *)vdp;
logical_block_size =
isonum_723 (high_sierra?
pri_sierra->logical_block_size:
pri->logical_block_size);
if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
|| (logical_block_size & (logical_block_size - 1)) != 0) {
error = EINVAL;
goto out;
}
rootp = (struct iso_directory_record *)
(high_sierra?
pri_sierra->root_directory_record:
pri->root_directory_record);
isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK);
bzero((caddr_t)isomp, sizeof *isomp);
isomp->logical_block_size = logical_block_size;
isomp->volume_space_size =
isonum_733 (high_sierra?
pri_sierra->volume_space_size:
pri->volume_space_size);
bcopy (rootp, isomp->root, sizeof isomp->root);
isomp->root_extent = isonum_733 (rootp->extent);
isomp->root_size = isonum_733 (rootp->size);
isomp->im_bmask = logical_block_size - 1;
isomp->im_bshift = 0;
while ((1 << isomp->im_bshift) < isomp->logical_block_size)
isomp->im_bshift++;
bp->b_flags |= B_AGE;
brelse(bp);
bp = NULL;
mp->mnt_data = (qaddr_t)isomp;
mp->mnt_stat.f_fsid.val[0] = (long)dev;
mp->mnt_stat.f_fsid.val[1] = MOUNT_CD9660;
mp->mnt_maxsymlinklen = 0;
mp->mnt_flag |= MNT_LOCAL;
isomp->im_mountp = mp;
isomp->im_dev = dev;
isomp->im_devvp = devvp;
devvp->v_specflags |= SI_MOUNTEDON;
/* Check the Rock Ridge Extention support */
if (!(argp->flags & ISOFSMNT_NORRIP)) {
if ((error = bread (isomp->im_devvp,
(isomp->root_extent + isonum_711(rootp->ext_attr_length))
* isomp->logical_block_size / DEV_BSIZE,
isomp->logical_block_size,NOCRED,&bp)))
goto out;
rootp = (struct iso_directory_record *)bp->b_un.b_addr;
if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
argp->flags |= ISOFSMNT_NORRIP;
} else {
argp->flags &= ~ISOFSMNT_GENS;
}
/*
* The contents are valid,
* but they will get reread as part of another vnode, so...
*/
bp->b_flags |= B_AGE;
brelse(bp);
bp = NULL;
}
isomp->im_flags = argp->flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS|ISOFSMNT_EXTATT);
if(high_sierra)
/* this effectively ignores all the mount flags */
isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
else
switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
default:
isomp->iso_ftype = ISO_FTYPE_DEFAULT;
break;
case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
isomp->iso_ftype = ISO_FTYPE_9660;
break;
case 0:
isomp->iso_ftype = ISO_FTYPE_RRIP;
break;
}
return 0;
out:
if (bp)
brelse(bp);
if (needclose)
(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
if (isomp) {
free((caddr_t)isomp, M_ISOFSMNT);
mp->mnt_data = (qaddr_t)0;
}
return error;
}
/*
* Make a filesystem operational.
* Nothing to do at the moment.
*/
/* ARGSUSED */
int
cd9660_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
return 0;
}
/*
* unmount system call
*/
int
cd9660_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
register struct iso_mnt *isomp;
int error, flags = 0;
if (mntflags & MNT_FORCE) {
if (!iso_doforce)
return (EINVAL);
flags |= FORCECLOSE;
}
#if 0
mntflushbuf(mp, 0);
if (mntinvalbuf(mp))
return EBUSY;
#endif
if ((error = vflush(mp, NULLVP, flags)))
return (error);
isomp = VFSTOISOFS(mp);
#ifdef ISODEVMAP
if (isomp->iso_ftype == ISO_FTYPE_RRIP)
iso_dunmap(isomp->im_dev);
#endif
isomp->im_devvp->v_specflags &= ~SI_MOUNTEDON;
error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED, p);
vrele(isomp->im_devvp);
free((caddr_t)isomp, M_ISOFSMNT);
mp->mnt_data = (qaddr_t)0;
mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}
/*
* Return root of a filesystem
*/
int
cd9660_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
register struct iso_node *ip;
struct iso_node tip, *nip;
struct vnode tvp;
int error;
struct iso_mnt *imp = VFSTOISOFS (mp);
struct iso_directory_record *dp;
tvp.v_mount = mp;
tvp.v_data = &tip;
ip = VTOI(&tvp);
ip->i_vnode = &tvp;
ip->i_dev = imp->im_dev;
ip->i_diroff = 0;
dp = (struct iso_directory_record *)imp->root;
isodirino(&ip->i_number,dp,imp);
/*
* With RRIP we must use the `.' entry of the root directory.
* Simply tell iget, that it's a relocated directory.
*/
error = iso_iget(ip,ip->i_number,
imp->iso_ftype == ISO_FTYPE_RRIP,
&nip,dp);
if (error)
return error;
*vpp = ITOV(nip);
return 0;
}
/*
* Do operations associated with quotas, not supported
*/
/* ARGSUSED */
int
cd9660_quotactl(mp, cmd, uid, arg, p)
struct mount *mp;
int cmd;
uid_t uid;
caddr_t arg;
struct proc *p;
{
return (EOPNOTSUPP);
}
/*
* Get file system statistics.
*/
int
cd9660_statfs(mp, sbp, p)
struct mount *mp;
register struct statfs *sbp;
struct proc *p;
{
register struct iso_mnt *isomp;
isomp = VFSTOISOFS(mp);
sbp->f_type = MOUNT_CD9660;
sbp->f_bsize = isomp->logical_block_size;
sbp->f_iosize = sbp->f_bsize; /* XXX */
sbp->f_blocks = isomp->volume_space_size;
sbp->f_bfree = 0; /* total free blocks */
sbp->f_bavail = 0; /* blocks free for non superuser */
sbp->f_files = 0; /* total files */
sbp->f_ffree = 0; /* free file nodes */
if (sbp != &mp->mnt_stat) {
bcopy((caddr_t)mp->mnt_stat.f_mntonname,
(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
}
/* Use the first spare for flags: */
sbp->f_spare[0] = isomp->im_flags;
return 0;
}
/* ARGSUSED */
int
cd9660_sync(mp, waitfor, cred, p)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
return (0);
}
/*
* Flat namespace lookup.
* Currently unsupported.
*/
/* ARGSUSED */
int
cd9660_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
return (EOPNOTSUPP);
}
/*
* 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;
};
/* ARGSUSED */
int
cd9660_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
register struct mount *mp;
struct fid *fhp;
struct mbuf *nam;
struct vnode **vpp;
int *exflagsp;
struct ucred **credanonp;
{
struct vnode tvp;
int error;
int lbn, off;
struct ifid *ifhp;
struct iso_mnt *imp;
struct buf *bp;
struct iso_directory_record *dirp;
struct iso_node tip, *ip, *nip;
struct netcred *np;
imp = VFSTOISOFS (mp);
ifhp = (struct ifid *)fhp;
#ifdef ISOFS_DBG
printf("fhtovp: ino %d, start %ld\n",
ifhp->ifid_ino, ifhp->ifid_start);
#endif
np = vfs_export_lookup(mp, &imp->im_export, nam);
if (np == NULL)
return (EACCES);
lbn = iso_lblkno(imp, ifhp->ifid_ino);
if (lbn >= imp->volume_space_size) {
printf("fhtovp: lbn exceed volume space %d\n", lbn);
return (ESTALE);
}
off = iso_blkoff(imp, ifhp->ifid_ino);
if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
printf("fhtovp: crosses block boundary %d\n",
off + ISO_DIRECTORY_RECORD_SIZE);
return (ESTALE);
}
error = bread(imp->im_devvp, btodb(lbn * imp->logical_block_size),
imp->logical_block_size, NOCRED, &bp);
if (error) {
printf("fhtovp: bread error %d\n",error);
brelse(bp);
return (error);
}
dirp = (struct iso_directory_record *)(bp->b_un.b_addr + off);
if (off + isonum_711(dirp->length) > imp->logical_block_size) {
brelse(bp);
printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
off+isonum_711(dirp->length), off,
isonum_711(dirp->length));
return (ESTALE);
}
if (isonum_733(dirp->extent) + isonum_711(dirp->ext_attr_length) !=
ifhp->ifid_start) {
brelse(bp);
printf("fhtovp: file start miss %d vs %ld\n",
isonum_733(dirp->extent)+isonum_711(dirp->ext_attr_length),
ifhp->ifid_start);
return (ESTALE);
}
brelse(bp);
ip = &tip;
tvp.v_mount = mp;
tvp.v_data = ip;
ip->i_vnode = &tvp;
ip->i_dev = imp->im_dev;
if ((error = iso_iget(ip, ifhp->ifid_ino, 0, &nip, dirp))) {
*vpp = NULLVP;
printf("fhtovp: failed to get inode\n");
return (error);
}
ip = nip;
/*
* XXX need generation number?
*/
if (ip->inode.iso_mode == 0) {
iso_iput(ip);
*vpp = NULLVP;
printf("fhtovp: inode mode == 0\n");
return (ESTALE);
}
*vpp = ITOV(ip);
*exflagsp = np->netc_exflags;
*credanonp = &np->netc_anon;
return 0;
}
/*
* Vnode pointer to File handle
*/
/* ARGSUSED */
int
cd9660_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
register struct iso_node *ip = VTOI(vp);
register struct ifid *ifhp;
ifhp = (struct ifid *)fhp;
ifhp->ifid_len = sizeof(struct ifid);
ifhp->ifid_ino = ip->i_number;
ifhp->ifid_start = ip->iso_start;
#ifdef ISOFS_DBG
printf("vptofh: ino %d, start %ld\n",
ifhp->ifid_ino,ifhp->ifid_start);
#endif
return 0;
}