NetBSD/sys/isofs/isofs_vfsops.c

584 lines
13 KiB
C

/*
* $Id: isofs_vfsops.c,v 1.9 1993/11/12 05:55:12 cgd Exp $
*/
#include "param.h"
#include "systm.h"
#include "namei.h"
#include "proc.h"
#include "kernel.h"
#include "vnode.h"
#include "miscfs/specfs/specdev.h" /* XXX */
#include "mount.h"
#include "buf.h"
#include "file.h"
#include "dkbad.h"
#include "disklabel.h"
#include "ioctl.h"
#include "errno.h"
#include "malloc.h"
#include "iso.h"
#include "isofs_node.h"
extern int enodev ();
struct vfsops isofs_vfsops = {
isofs_mount,
isofs_start,
isofs_unmount,
isofs_root,
(void *)enodev, /* quotactl */
isofs_statfs,
isofs_sync,
isofs_fhtovp,
isofs_vptofh,
isofs_init
};
/*
* 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 iso_mountfs();
isofs_mountroot()
{
register struct mount *mp;
extern struct vnode *rootvp;
struct proc *p = curproc; /* XXX */
struct iso_mnt *imp;
register struct fs *fs;
u_int size;
int error;
struct iso_args args;
mp = (struct mount *)malloc((u_long)sizeof(struct mount),
M_MOUNT, M_WAITOK);
mp->mnt_op = (struct vfsops *)&isofs_vfsops;
mp->mnt_flag = MNT_RDONLY;
mp->mnt_exroot = 0;
mp->mnt_mounth = NULLVP;
args.flags = ISOFSMNT_ROOT;
error = iso_mountfs(rootvp, mp, p, &args);
if (error) {
free((caddr_t)mp, M_MOUNT);
return error;
}
if (error = vfs_lock(mp)) {
(void)isofs_unmount(mp, 0, p);
free((caddr_t)mp, M_MOUNT);
return error;
}
rootfs = mp;
mp->mnt_next = mp;
mp->mnt_prev = mp;
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) isofs_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
*/
isofs_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;
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 0;
}
/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible block device.
*/
ndp->ni_nameiop = LOOKUP | FOLLOW;
ndp->ni_segflg = UIO_USERSPACE;
ndp->ni_dirp = args.fspec;
if (error = namei(ndp, p))
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) isofs_statfs(mp, &mp->mnt_stat, p);
return 0;
}
/*
* Common code for mount and mountroot
*/
static 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;
caddr_t base, space;
int havepart = 0, blks;
int error = EINVAL, i, size;
int needclose = 0;
int ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
extern struct vnode *rootvp;
int j;
int iso_bsize;
int iso_blknum;
struct iso_volume_descriptor *vdp;
struct iso_primary_descriptor *pri;
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 = mountedon(devvp))
return error;
if (vcount(devvp) > 1 && devvp != rootvp)
return EBUSY;
vinvalbuf(devvp, 1);
if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, 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 = 2048;
for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) {
if (error = bread (devvp, iso_blknum * iso_bsize / DEV_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) {
error = EINVAL;
goto out;
}
if (isonum_711 (vdp->type) == ISO_VD_END) {
error = EINVAL;
goto out;
}
if (isonum_711 (vdp->type) == ISO_VD_PRIMARY)
break;
brelse(bp);
}
if (isonum_711 (vdp->type) != ISO_VD_PRIMARY) {
error = EINVAL;
goto out;
}
pri = (struct iso_primary_descriptor *)vdp;
logical_block_size = isonum_723 (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 *)pri->root_directory_record;
isomp = (struct iso_mnt *)malloc(sizeof *isomp,M_ISOFSMNT,M_WAITOK);
isomp->logical_block_size = logical_block_size;
isomp->volume_space_size = isonum_733 (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_ISOFS;
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 = isofs_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);
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 */
isofs_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
return 0;
}
/*
* unmount system call
*/
isofs_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
register struct iso_mnt *isomp;
int i, error, ronly, flags = 0;
if (mntflags & MNT_FORCE) {
if (!iso_doforce || mp == rootfs)
return EINVAL;
flags |= FORCECLOSE;
}
mntflushbuf(mp, 0);
if (mntinvalbuf(mp))
return EBUSY;
isomp = VFSTOISOFS(mp);
if (error = vflush(mp, NULLVP, flags))
return error;
#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
*/
isofs_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
register struct iso_node *ip;
struct iso_node *nip;
struct vnode tvp;
int error;
struct iso_mnt *imp = VFSTOISOFS (mp);
struct iso_directory_record *dp;
tvp.v_mount = mp;
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;
}
/*
* Get file system statistics.
*/
isofs_statfs(mp, sbp, p)
struct mount *mp;
register struct statfs *sbp;
struct proc *p;
{
register struct iso_mnt *isomp;
register struct fs *fs;
isomp = VFSTOISOFS(mp);
sbp->f_type = MOUNT_ISOFS;
sbp->f_fsize = isomp->logical_block_size;
sbp->f_bsize = sbp->f_fsize;
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;
}
isofs_sync(mp, waitfor)
struct mount *mp;
int waitfor;
{
return 0;
}
/*
* 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;
off_t ifid_start;
};
isofs_fhtovp(mp, fhp, vpp)
register struct mount *mp;
struct fid *fhp;
struct vnode **vpp;
{
/* here's a guess at what we need here */
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 *ip, *nip;
ifhp = (struct ifid *)fhp;
imp = VFSTOISOFS (mp);
#ifdef ISOFS_DBG
printf("fhtovp: ino %d, start %ld\n",ifhp->ifid_ino,ifhp->ifid_start);
#endif
lbn = ifhp->ifid_ino >> imp->im_bshift;
off = ifhp->ifid_ino & imp->im_bmask;
if (lbn >= imp->volume_space_size) {
printf("fhtovp: lbn exceed volume space %d\n",lbn);
return EINVAL;
}
if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
printf("fhtovp: across the block boundary %d\n",
off + ISO_DIRECTORY_RECORD_SIZE);
return EINVAL;
}
if (error = bread(imp->im_devvp,
lbn * imp->logical_block_size / DEV_BSIZE,
imp->logical_block_size,
NOCRED,&bp)) {
printf("fhtovp: bread error %d\n",error);
brelse(bp);
return EINVAL;
}
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 across the block boundary %d[off=%d/len=%d]\n",
off + isonum_711(dirp->length),off,isonum_711(dirp->length));
return EINVAL;
}
if (isonum_733(dirp->extent) + isonum_711(dirp->ext_attr_length)
!= ifhp->ifid_start) {
brelse(bp);
printf("fhtovp: file start miss %d vs %d\n",
isonum_733(dirp->extent) + isonum_711(dirp->ext_attr_length),
ifhp->ifid_start);
return EINVAL;
}
tvp.v_mount = mp;
ip = VTOI(&tvp);
ip->i_vnode = &tvp;
ip->i_dev = imp->im_dev;
if (error = iso_iget(ip,ifhp->ifid_ino,0,&nip,dirp)) {
*vpp = NULLVP;
brelse(bp);
printf("fhtovp: failed to get ino\n");
return error;
}
ip = nip;
*vpp = ITOV(ip);
brelse(bp);
return 0;
}
/*
* Vnode pointer to File handle
*/
/* ARGSUSED */
isofs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
register struct iso_node *ip = VTOI(vp);
register struct ifid *ifhp;
register struct iso_mnt *mp = ip->i_mnt;
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;
}