Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/isofs/isofs_vfsops.c

568 lines
12 KiB
C
Raw Blame History

#include "param.h"
#include "systm.h"
#include "namei.h"
#include "proc.h"
#include "kernel.h"
#include "vnode.h"
#include "specdev.h"
#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 ufs is going to be mounted as root.
*
* Name is updated by mount(8) after booting.
*/
#define ROOTNAME "root_device"
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;
mp = (struct mount *)malloc((u_long)sizeof(struct mount),
M_MOUNT, M_WAITOK);
mp->mnt_op = &isofs_vfsops;
mp->mnt_flag = MNT_RDONLY;
mp->mnt_exroot = 0;
mp->mnt_mounth = NULLVP;
error = iso_mountfs(rootvp, mp, p);
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 ufs_args args;
u_int size;
int error;
struct iso_mnt *imp;
if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
return (error);
if ((mp->mnt_flag & MNT_RDONLY) == 0)
return (EROFS);
/*
* Process export requests.
*/
if ((args.exflags & MNT_EXPORTED) || (mp->mnt_flag & MNT_EXPORTED)) {
if (args.exflags & MNT_EXPORTED)
mp->mnt_flag |= MNT_EXPORTED;
else
mp->mnt_flag &= ~MNT_EXPORTED;
if (args.exflags & MNT_EXRDONLY)
mp->mnt_flag |= MNT_EXRDONLY;
else
mp->mnt_flag &= ~MNT_EXRDONLY;
mp->mnt_exroot = args.exroot;
}
/*
* 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);
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
*/
iso_mountfs(devvp, mp, p)
register struct vnode *devvp;
struct mount *mp;
struct proc *p;
{
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 = iso_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_UFSMNT,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_bsize = logical_block_size;
isomp->im_bmask = ~(isomp->im_bsize - 1);
isomp->im_bshift = 0;
while ((1 << isomp->im_bshift) < isomp->im_bsize)
isomp->im_bshift++;
bp->b_flags |= B_INVAL;
brelse(bp);
bp = NULL;
isomp->im_ronly = ronly;
if (ronly == 0)
isomp->im_fmod = 1;
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;
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_UFSMNT);
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);
ronly = !isomp->im_ronly;
isomp->im_devvp->v_specflags &= ~SI_MOUNTEDON;
error = VOP_CLOSE(isomp->im_devvp, ronly ? FREAD : FREAD|FWRITE,
NOCRED, p);
vrele(isomp->im_devvp);
free((caddr_t)isomp, M_UFSMNT);
mp->mnt_data = (qaddr_t)0;
mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}
/*
* Check to see if a filesystem is mounted on a block device.
*/
iso_mountedon(vp)
register struct vnode *vp;
{
register struct vnode *vq;
if (vp->v_specflags & SI_MOUNTEDON)
return (EBUSY);
if (vp->v_flag & VALIASED) {
for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
if (vq->v_rdev != vp->v_rdev ||
vq->v_type != vp->v_type)
continue;
if (vq->v_specflags & SI_MOUNTEDON)
return (EBUSY);
}
}
return (0);
}
/*
* 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);
tvp.v_mount = mp;
ip = VTOI(&tvp);
ip->i_vnode = &tvp;
ip->i_dev = imp->im_dev;
ip->i_diroff = 0;
ip->iso_extent = imp->root_extent;
ip->i_diroff = 0;
error = iso_iget(ip, imp->root_extent, &nip,
(struct iso_directory_record *) imp->root);
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);
}
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_lbn;
int ifid_offset;
int ifid_ino;
};
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;
struct proc *p;
ifhp = (struct ifid *)fhp;
imp = VFSTOISOFS (mp);
#ifdef ISOFS_DBG
printf("fhtovp: lbn %d, off %d, ino %d\n",
ifhp->ifid_lbn, ifhp->ifid_offset, ifhp->ifid_ino);
#endif
lbn = ifhp->ifid_lbn;
off = ifhp->ifid_offset;
ifhp->ifid_lbn += (ifhp->ifid_offset >> 12);
ifhp->ifid_offset &= 0x7fff;
if (ifhp->ifid_lbn >= imp->volume_space_size)
return (EINVAL);
if (ifhp->ifid_offset + sizeof (struct iso_directory_record)
>= imp->im_bsize)
return (EINVAL);
if (error = bread (imp->im_devvp,
(ifhp->ifid_lbn * imp->im_bsize / DEV_BSIZE), imp->im_bsize,
NOCRED, &bp)) {
printf("fhtovp: bread error %d\n", error);
return(EINVAL);
}
dirp = (struct iso_directory_record *)
(bp->b_un.b_addr + ifhp->ifid_offset);
if (ifhp->ifid_offset + isonum_711 (dirp->length) >= imp->im_bsize) {
brelse (bp);
return (EINVAL);
}
if (isonum_733(dirp->extent) != ifhp->ifid_ino) {
brelse(bp);
return(EINVAL);
}
tvp.v_mount = mp;
ip = VTOI(&tvp);
ip->i_vnode = &tvp;
ip->i_dev = imp->im_dev;
ip->i_diroff = off;
ip->iso_extent = lbn;
if (error = iso_iget(ip, ifhp->ifid_ino, &nip, dirp)) {
*vpp = NULLVP;
brelse (bp);
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_lbn = ip->iso_parent_ext;
ifhp->ifid_offset = ip->iso_parent;
ifhp->ifid_ino = ip->i_number;
if(ip->i_number == mp->root_extent) {
ifhp->ifid_lbn = ip->i_number;
ifhp->ifid_offset = 0;
}
#ifdef ISOFS_DBG
printf("vptofh: lbn %d, off %d, ino %d\n",
ifhp->ifid_lbn, ifhp->ifid_offset, ifhp->ifid_ino);
#endif
return (0);
}
Reference in New Issue View Git Blame Copy Permalink