(sys_getfh): moved here from nfs_syscalls.c

(sys_fhopen, sys_fhstat, sys_fhstatfs): new system calls that use file
handles instead of file names.  largely based on NetBSD

1 files changed, 246 insertions, 1 deletions

diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index dca9f9033d6..caec7dbdf3f 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vfs_syscalls.c,v 1.61 2000/02/01 04:03:14 assar Exp $	*/
+/*	$OpenBSD: vfs_syscalls.c,v 1.62 2000/02/07 04:55:19 assar Exp $	*/
 /*	$NetBSD: vfs_syscalls.c,v 1.71 1996/04/23 10:29:02 mycroft Exp $	*/
 
 /*
@@ -948,6 +948,251 @@ sys_open(p, v, retval)
 }
 
 /*
+ * Get file handle system call
+ */
+int
+sys_getfh(p, v, retval)
+	struct proc *p;
+	register void *v;
+	register_t *retval;
+{
+	register struct sys_getfh_args /* {
+		syscallarg(char *) fname;
+		syscallarg(fhandle_t *) fhp;
+	} */ *uap = v;
+	register struct vnode *vp;
+	fhandle_t fh;
+	int error;
+	struct nameidata nd;
+
+	/*
+	 * Must be super user
+	 */
+	error = suser(p->p_ucred, &p->p_acflag);
+	if(error)
+		return (error);
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, fname), p);
+	error = namei(&nd);
+	if (error)
+		return (error);
+	vp = nd.ni_vp;
+	bzero((caddr_t)&fh, sizeof(fh));
+	fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
+	error = VFS_VPTOFH(vp, &fh.fh_fid);
+	vput(vp);
+	if (error)
+		return (error);
+	error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh));
+	return (error);
+}
+
+/*
+ * Open a file given a file handle.
+ *
+ * Check permissions, allocate an open file structure,
+ * and call the device open routine if any.
+ */
+int
+sys_fhopen(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_fhopen_args /* {
+		syscallarg(const fhandle_t *) fhp;
+		syscallarg(int) flags;
+	} */ *uap = v;
+	struct filedesc *fdp = p->p_fd;
+	struct file *fp;
+	struct vnode *vp = NULL;
+	struct mount *mp;
+	struct ucred *cred = p->p_ucred;
+	int flags;
+	struct file *nfp;
+	int type, indx, error=0;
+	struct flock lf;
+	struct vattr va;
+	fhandle_t fh;
+
+	/*
+	 * Must be super user
+	 */
+	if ((error = suser(p->p_ucred, &p->p_acflag)))
+		return (error);
+
+	flags = FFLAGS(SCARG(uap, flags));
+	if ((flags & (FREAD | FWRITE)) == 0)
+		return (EINVAL);
+	if ((flags & O_CREAT))
+		return (EINVAL);
+
+	if ((error = falloc(p, &nfp, &indx)) != 0)
+		return (error);
+	fp = nfp;
+	if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
+		goto bad;
+
+	if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) {
+		error = ESTALE;
+		goto bad;
+	}
+
+	if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) {
+		vp = NULL;	/* most likely unnecessary sanity for bad: */
+		goto bad;
+	}
+
+	/* Now do an effective vn_open */
+
+	if (vp->v_type == VSOCK) {
+		error = EOPNOTSUPP;
+		goto bad;
+	}
+	if (flags & FREAD) {
+		if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0)
+			goto bad;
+	}
+	if (flags & (FWRITE | O_TRUNC)) {
+		if (vp->v_type == VDIR) {
+			error = EISDIR;
+			goto bad;
+		}
+		if ((error = vn_writechk(vp)) != 0 ||
+		    (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0)
+			goto bad;
+	}
+	if (flags & O_TRUNC) {
+		VOP_UNLOCK(vp, 0, p);				/* XXX */
+		VOP_LEASE(vp, p, cred, LEASE_WRITE);
+		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);	/* XXX */
+		VATTR_NULL(&va);
+		va.va_size = 0;
+		if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0)
+			goto bad;
+	}
+	if ((error = VOP_OPEN(vp, flags, cred, p)) != 0)
+		goto bad;
+	if (flags & FWRITE)
+		vp->v_writecount++;
+
+	/* done with modified vn_open, now finish what sys_open does. */
+
+	fp->f_flag = flags & FMASK;
+	fp->f_type = DTYPE_VNODE;
+	fp->f_ops = &vnops;
+	fp->f_data = (caddr_t)vp;
+	if (flags & (O_EXLOCK | O_SHLOCK)) {
+		lf.l_whence = SEEK_SET;
+		lf.l_start = 0;
+		lf.l_len = 0;
+		if (flags & O_EXLOCK)
+			lf.l_type = F_WRLCK;
+		else
+			lf.l_type = F_RDLCK;
+		type = F_FLOCK;
+		if ((flags & FNONBLOCK) == 0)
+			type |= F_WAIT;
+		VOP_UNLOCK(vp, 0, p);
+		error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type);
+		if (error) {
+			(void) vn_close(vp, fp->f_flag, fp->f_cred, p);
+			ffree(fp);
+			fdremove(fdp, indx);
+			return (error);
+		}
+		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+		fp->f_flag |= FHASLOCK;
+	}
+	VOP_UNLOCK(vp, 0, p);
+	*retval = indx;
+	return (0);
+
+bad:
+	ffree(fp);
+	fdremove(fdp, indx);
+	if (vp != NULL)
+		vput(vp);
+	return (error);
+}
+
+/* ARGSUSED */
+int
+sys_fhstat(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_fhstat_args /* {
+		syscallarg(const fhandle_t *) fhp;
+		syscallarg(struct stat *) sb;
+	} */ *uap = v;
+	struct stat sb;
+	int error;
+	fhandle_t fh;
+	struct mount *mp;
+	struct vnode *vp;
+
+	/*
+	 * Must be super user
+	 */
+	if ((error = suser(p->p_ucred, &p->p_acflag)))
+		return (error);
+
+	if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
+		return (error);
+
+	if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
+		return (ESTALE);
+	if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
+		return (error);
+	error = vn_stat(vp, &sb, p);
+	vput(vp);
+	if (error)
+		return (error);
+	error = copyout(&sb, SCARG(uap, sb), sizeof(sb));
+	return (error);
+}
+
+/* ARGSUSED */
+int
+sys_fhstatfs(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_fhstatfs_args /*
+		syscallarg(const fhandle_t *) fhp;
+		syscallarg(struct statfs *) buf;
+	} */ *uap = v;
+	struct statfs sp;
+	fhandle_t fh;
+	struct mount *mp;
+	struct vnode *vp;
+	int error;
+
+	/*
+	 * Must be super user
+	 */
+	if ((error = suser(p->p_ucred, &p->p_acflag)))
+		return (error);
+
+	if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
+		return (error);
+
+	if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
+		return (ESTALE);
+	if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
+		return (error);
+	mp = vp->v_mount;
+	vput(vp);
+	if ((error = VFS_STATFS(mp, &sp, p)) != 0)
+		return (error);
+	sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+	return (copyout(&sp, SCARG(uap, buf), sizeof(sp)));
+}
+
+/*
  * Create a special file.
  */
 /* ARGSUSED */