572 lines
12 KiB
C
572 lines
12 KiB
C
/*
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* $Id: isofs_vfsops.c,v 1.3 1993/05/20 03:30:54 cgd Exp $
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*/
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#include "param.h"
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#include "systm.h"
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#include "namei.h"
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#include "proc.h"
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#include "kernel.h"
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#include "vnode.h"
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#include "specdev.h"
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#include "mount.h"
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#include "buf.h"
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#include "file.h"
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#include "dkbad.h"
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#include "disklabel.h"
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#include "ioctl.h"
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#include "errno.h"
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#include "malloc.h"
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#include "iso.h"
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#include "isofs_node.h"
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extern int enodev ();
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struct vfsops isofs_vfsops = {
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isofs_mount,
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isofs_start,
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isofs_unmount,
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isofs_root,
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(void *)enodev, /* quotactl */
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isofs_statfs,
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isofs_sync,
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isofs_fhtovp,
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isofs_vptofh,
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isofs_init
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};
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/*
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* Called by vfs_mountroot when ufs is going to be mounted as root.
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*
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* Name is updated by mount(8) after booting.
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*/
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#define ROOTNAME "root_device"
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isofs_mountroot()
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{
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register struct mount *mp;
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extern struct vnode *rootvp;
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struct proc *p = curproc; /* XXX */
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struct iso_mnt *imp;
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register struct fs *fs;
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u_int size;
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int error;
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mp = (struct mount *)malloc((u_long)sizeof(struct mount),
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M_MOUNT, M_WAITOK);
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mp->mnt_op = &isofs_vfsops;
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mp->mnt_flag = MNT_RDONLY;
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mp->mnt_exroot = 0;
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mp->mnt_mounth = NULLVP;
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error = iso_mountfs(rootvp, mp, p);
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if (error) {
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free((caddr_t)mp, M_MOUNT);
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return (error);
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}
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if (error = vfs_lock(mp)) {
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(void)isofs_unmount(mp, 0, p);
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free((caddr_t)mp, M_MOUNT);
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return (error);
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}
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rootfs = mp;
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mp->mnt_next = mp;
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mp->mnt_prev = mp;
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mp->mnt_vnodecovered = NULLVP;
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imp = VFSTOISOFS(mp);
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bzero(imp->im_fsmnt, sizeof(imp->im_fsmnt));
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imp->im_fsmnt[0] = '/';
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bcopy((caddr_t)imp->im_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
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MNAMELEN);
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(void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
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&size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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(void) isofs_statfs(mp, &mp->mnt_stat, p);
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vfs_unlock(mp);
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return (0);
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}
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/*
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* Flag to allow forcible unmounting.
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*/
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int iso_doforce = 1;
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/*
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* VFS Operations.
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*
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* mount system call
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*/
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isofs_mount(mp, path, data, ndp, p)
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register struct mount *mp;
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char *path;
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caddr_t data;
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struct nameidata *ndp;
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struct proc *p;
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{
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struct vnode *devvp;
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struct ufs_args args;
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u_int size;
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int error;
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struct iso_mnt *imp;
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if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
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return (error);
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if ((mp->mnt_flag & MNT_RDONLY) == 0)
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return (EROFS);
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/*
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* Process export requests.
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*/
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if ((args.exflags & MNT_EXPORTED) || (mp->mnt_flag & MNT_EXPORTED)) {
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if (args.exflags & MNT_EXPORTED)
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mp->mnt_flag |= MNT_EXPORTED;
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else
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mp->mnt_flag &= ~MNT_EXPORTED;
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if (args.exflags & MNT_EXRDONLY)
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mp->mnt_flag |= MNT_EXRDONLY;
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else
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mp->mnt_flag &= ~MNT_EXRDONLY;
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mp->mnt_exroot = args.exroot;
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}
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/*
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* If updating, check whether changing from read-only to
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* read/write; if there is no device name, that's all we do.
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*/
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if (mp->mnt_flag & MNT_UPDATE) {
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imp = VFSTOISOFS(mp);
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if (args.fspec == 0)
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return (0);
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}
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/*
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* Not an update, or updating the name: look up the name
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* and verify that it refers to a sensible block device.
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*/
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ndp->ni_nameiop = LOOKUP | FOLLOW;
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ndp->ni_segflg = UIO_USERSPACE;
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ndp->ni_dirp = args.fspec;
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if (error = namei(ndp, p))
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return (error);
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devvp = ndp->ni_vp;
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if (devvp->v_type != VBLK) {
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vrele(devvp);
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return (ENOTBLK);
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}
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if (major(devvp->v_rdev) >= nblkdev) {
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vrele(devvp);
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return (ENXIO);
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}
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if ((mp->mnt_flag & MNT_UPDATE) == 0)
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error = iso_mountfs(devvp, mp, p);
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else {
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if (devvp != imp->im_devvp)
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error = EINVAL; /* needs translation */
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else
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vrele(devvp);
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}
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if (error) {
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vrele(devvp);
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return (error);
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}
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imp = VFSTOISOFS(mp);
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(void) copyinstr(path, imp->im_fsmnt, sizeof(imp->im_fsmnt)-1, &size);
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bzero(imp->im_fsmnt + size, sizeof(imp->im_fsmnt) - size);
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bcopy((caddr_t)imp->im_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
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MNAMELEN);
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(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
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&size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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(void) isofs_statfs(mp, &mp->mnt_stat, p);
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return (0);
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}
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/*
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* Common code for mount and mountroot
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*/
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iso_mountfs(devvp, mp, p)
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register struct vnode *devvp;
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struct mount *mp;
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struct proc *p;
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{
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register struct iso_mnt *isomp = (struct iso_mnt *)0;
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struct buf *bp = NULL;
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dev_t dev = devvp->v_rdev;
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caddr_t base, space;
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int havepart = 0, blks;
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int error = EINVAL, i, size;
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int needclose = 0;
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int ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
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extern struct vnode *rootvp;
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int j;
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int iso_bsize;
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int iso_blknum;
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struct iso_volume_descriptor *vdp;
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struct iso_primary_descriptor *pri;
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struct iso_directory_record *rootp;
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int logical_block_size;
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if (!ronly)
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return (EROFS);
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/*
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* Disallow multiple mounts of the same device.
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* Disallow mounting of a device that is currently in use
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* (except for root, which might share swap device for miniroot).
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* Flush out any old buffers remaining from a previous use.
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*/
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if (error = iso_mountedon(devvp))
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return (error);
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if (vcount(devvp) > 1 && devvp != rootvp)
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return (EBUSY);
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vinvalbuf(devvp, 1);
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if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p))
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return (error);
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needclose = 1;
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/* This is the "logical sector size". The standard says this
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* should be 2048 or the physical sector size on the device,
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* whichever is greater. For now, we'll just use a constant.
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*/
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iso_bsize = 2048;
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for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) {
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if (error = bread (devvp, iso_blknum * iso_bsize / DEV_BSIZE,
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iso_bsize, NOCRED, &bp))
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goto out;
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vdp = (struct iso_volume_descriptor *)bp->b_un.b_addr;
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if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
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error = EINVAL;
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goto out;
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}
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if (isonum_711 (vdp->type) == ISO_VD_END) {
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error = EINVAL;
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goto out;
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}
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if (isonum_711 (vdp->type) == ISO_VD_PRIMARY)
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break;
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brelse(bp);
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}
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if (isonum_711 (vdp->type) != ISO_VD_PRIMARY) {
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error = EINVAL;
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goto out;
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}
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pri = (struct iso_primary_descriptor *)vdp;
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logical_block_size = isonum_723 (pri->logical_block_size);
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if (logical_block_size < DEV_BSIZE
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|| logical_block_size >= MAXBSIZE
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|| (logical_block_size & (logical_block_size - 1)) != 0) {
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error = EINVAL;
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goto out;
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}
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rootp = (struct iso_directory_record *)pri->root_directory_record;
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isomp = (struct iso_mnt *)malloc(sizeof *isomp,M_UFSMNT,M_WAITOK);
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isomp->logical_block_size = logical_block_size;
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isomp->volume_space_size = isonum_733 (pri->volume_space_size);
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bcopy (rootp, isomp->root, sizeof isomp->root);
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isomp->root_extent = isonum_733 (rootp->extent);
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isomp->root_size = isonum_733 (rootp->size);
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isomp->im_bsize = logical_block_size;
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isomp->im_bmask = ~(isomp->im_bsize - 1);
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isomp->im_bshift = 0;
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while ((1 << isomp->im_bshift) < isomp->im_bsize)
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isomp->im_bshift++;
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bp->b_flags |= B_INVAL;
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brelse(bp);
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bp = NULL;
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isomp->im_ronly = ronly;
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if (ronly == 0)
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isomp->im_fmod = 1;
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mp->mnt_data = (qaddr_t)isomp;
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mp->mnt_stat.f_fsid.val[0] = (long)dev;
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mp->mnt_stat.f_fsid.val[1] = MOUNT_ISOFS;
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mp->mnt_flag |= MNT_LOCAL;
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isomp->im_mountp = mp;
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isomp->im_dev = dev;
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isomp->im_devvp = devvp;
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devvp->v_specflags |= SI_MOUNTEDON;
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return (0);
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out:
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if (bp)
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brelse(bp);
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if (needclose)
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(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
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if (isomp) {
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free((caddr_t)isomp, M_UFSMNT);
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mp->mnt_data = (qaddr_t)0;
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}
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return (error);
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}
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/*
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* Make a filesystem operational.
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* Nothing to do at the moment.
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*/
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/* ARGSUSED */
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isofs_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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{
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return (0);
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}
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/*
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* unmount system call
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*/
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isofs_unmount(mp, mntflags, p)
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struct mount *mp;
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int mntflags;
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struct proc *p;
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{
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register struct iso_mnt *isomp;
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int i, error, ronly, flags = 0;
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if (mntflags & MNT_FORCE) {
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if (!iso_doforce || mp == rootfs)
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return (EINVAL);
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flags |= FORCECLOSE;
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}
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mntflushbuf(mp, 0);
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if (mntinvalbuf(mp))
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return (EBUSY);
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isomp = VFSTOISOFS(mp);
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if (error = vflush(mp, NULLVP, flags))
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return (error);
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ronly = !isomp->im_ronly;
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isomp->im_devvp->v_specflags &= ~SI_MOUNTEDON;
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error = VOP_CLOSE(isomp->im_devvp, ronly ? FREAD : FREAD|FWRITE,
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NOCRED, p);
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vrele(isomp->im_devvp);
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free((caddr_t)isomp, M_UFSMNT);
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mp->mnt_data = (qaddr_t)0;
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mp->mnt_flag &= ~MNT_LOCAL;
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return (error);
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}
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/*
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* Check to see if a filesystem is mounted on a block device.
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*/
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iso_mountedon(vp)
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register struct vnode *vp;
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{
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register struct vnode *vq;
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if (vp->v_specflags & SI_MOUNTEDON)
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return (EBUSY);
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if (vp->v_flag & VALIASED) {
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for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
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if (vq->v_rdev != vp->v_rdev ||
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vq->v_type != vp->v_type)
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continue;
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if (vq->v_specflags & SI_MOUNTEDON)
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return (EBUSY);
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}
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}
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return (0);
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}
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/*
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* Return root of a filesystem
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*/
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isofs_root(mp, vpp)
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struct mount *mp;
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struct vnode **vpp;
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{
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register struct iso_node *ip;
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struct iso_node *nip;
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struct vnode tvp;
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int error;
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struct iso_mnt *imp = VFSTOISOFS (mp);
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tvp.v_mount = mp;
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ip = VTOI(&tvp);
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ip->i_vnode = &tvp;
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ip->i_dev = imp->im_dev;
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ip->i_diroff = 0;
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ip->iso_extent = imp->root_extent;
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ip->i_diroff = 0;
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error = iso_iget(ip, imp->root_extent, &nip,
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(struct iso_directory_record *) imp->root);
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if (error)
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return (error);
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*vpp = ITOV(nip);
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return (0);
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}
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/*
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* Get file system statistics.
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*/
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isofs_statfs(mp, sbp, p)
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struct mount *mp;
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register struct statfs *sbp;
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struct proc *p;
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{
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register struct iso_mnt *isomp;
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register struct fs *fs;
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isomp = VFSTOISOFS(mp);
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sbp->f_type = MOUNT_ISOFS;
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sbp->f_fsize = isomp->logical_block_size;
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sbp->f_bsize = sbp->f_fsize;
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sbp->f_blocks = isomp->volume_space_size;
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sbp->f_bfree = 0; /* total free blocks */
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sbp->f_bavail = 0; /* blocks free for non superuser */
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sbp->f_files = 0; /* total files */
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sbp->f_ffree = 0; /* free file nodes */
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if (sbp != &mp->mnt_stat) {
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bcopy((caddr_t)mp->mnt_stat.f_mntonname,
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(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
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bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
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(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
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}
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return (0);
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}
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isofs_sync(mp, waitfor)
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struct mount *mp;
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int waitfor;
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{
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return (0);
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}
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/*
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* File handle to vnode
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*
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* Have to be really careful about stale file handles:
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* - check that the inode number is in range
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* - call iget() to get the locked inode
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* - check for an unallocated inode (i_mode == 0)
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* - check that the generation number matches
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*/
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struct ifid {
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ushort ifid_len;
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ushort ifid_pad;
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int ifid_lbn;
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int ifid_offset;
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int ifid_ino;
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};
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isofs_fhtovp(mp, fhp, vpp)
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register struct mount *mp;
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struct fid *fhp;
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struct vnode **vpp;
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{
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/* here's a guess at what we need here */
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struct vnode tvp;
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int error;
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int lbn, off;
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struct ifid *ifhp;
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struct iso_mnt *imp;
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struct buf *bp;
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struct iso_directory_record *dirp;
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struct iso_node *ip, *nip;
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struct proc *p;
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ifhp = (struct ifid *)fhp;
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imp = VFSTOISOFS (mp);
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#ifdef ISOFS_DBG
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printf("fhtovp: lbn %d, off %d, ino %d\n",
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ifhp->ifid_lbn, ifhp->ifid_offset, ifhp->ifid_ino);
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#endif
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lbn = ifhp->ifid_lbn;
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off = ifhp->ifid_offset;
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ifhp->ifid_lbn += (ifhp->ifid_offset >> 12);
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ifhp->ifid_offset &= 0x7fff;
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if (ifhp->ifid_lbn >= imp->volume_space_size)
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return (EINVAL);
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if (ifhp->ifid_offset + sizeof (struct iso_directory_record)
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>= imp->im_bsize)
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return (EINVAL);
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if (error = bread (imp->im_devvp,
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(ifhp->ifid_lbn * imp->im_bsize / DEV_BSIZE), imp->im_bsize,
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NOCRED, &bp)) {
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printf("fhtovp: bread error %d\n", error);
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return(EINVAL);
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}
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|
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);
|
|
}
|