From e38fb7f621f5a15c4f060b1efc6bde9c40a26b00 Mon Sep 17 00:00:00 2001
From: "William F. Jolitz" <wjolitz@soda.berkeley.edu>
Date: Sat, 27 Jun 1992 19:10:27 -0800
Subject: [PATCH 1/1] 386BSD 0.1 development Work on file
 usr/src/sys.386bsd/isofs/isofs_vfsops.c

Co-Authored-By: Lynne Greer Jolitz <ljolitz@cardio.ucsf.edu>
Synthesized-from: 386BSD-0.1
---
 usr/src/sys.386bsd/isofs/isofs_vfsops.c | 518 ++++++++++++++++++++++++
 1 file changed, 518 insertions(+)
 create mode 100644 usr/src/sys.386bsd/isofs/isofs_vfsops.c

diff --git a/usr/src/sys.386bsd/isofs/isofs_vfsops.c b/usr/src/sys.386bsd/isofs/isofs_vfsops.c
new file mode 100644
index 0000000000..460659b0bb
--- /dev/null
+++ b/usr/src/sys.386bsd/isofs/isofs_vfsops.c
@@ -0,0 +1,518 @@
+#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;
+	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
+ */
+isofs_fhtovp(mp, fhp, vpp)
+	register struct mount *mp;
+	struct fid *fhp;
+	struct vnode **vpp;
+{
+	return (EINVAL);
+#if 0
+	/* here's a guess at what we need here */
+	struct vnode tvp;
+	int error;
+
+	ifhp = (struct ifid *)fhp;
+	imp = VFSTOISOFS (mp);
+
+	if (ifhp->ifid_lbn >= imp->volume_space_size)
+		return (EINVAL);
+
+	if (ifhp->ifid_offset + sizeof (struct iso_directory_record)
+	    >= imp->im_bsize)
+		return (EINVAL);
+
+	bread (isomp->im_devvp, ifhp->ifid_lbn, imp->im_bsize, NOCRED, &bp);
+
+	dirp = bp->b_un.b_addr + ifhp->ifid_offset;
+
+	if (ifhp->ifid_offset + isonum_711 (dirp) >= imp->im_bsize) {
+		brelse (bp);
+		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, &nip, dirp)) {
+		*vpp = NULLVP;
+		brelse (bp);
+		return (error);
+	}
+	ip = nip;
+	*vpp = ITOV(ip);
+	brelse (bp);
+	return (0);
+#endif
+}
+
+/*
+ * Vnode pointer to File handle
+ */
+/* ARGSUSED */
+isofs_vptofh(vp, fhp)
+	struct vnode *vp;
+	struct fid *fhp;
+{
+	return (EINVAL);
+#if 0
+	register struct inode *ip = VTOI(vp);
+	register struct ufid *ufhp;
+
+	ufhp = (struct ufid *)fhp;
+	ufhp->ufid_len = sizeof(struct ufid);
+	ufhp->ufid_ino = ip->i_number;
+	ufhp->ufid_gen = ip->i_gen;
+	return (0);
+#endif
+}
-- 
2.20.1