1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007 Ulf Lilleengen
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <stdbool.h>
30
31#include <sys/param.h>
32#define _KERNEL
33#include <sys/mount.h>
34#undef _KERNEL
35#include <sys/queue.h>
36#include <sys/stat.h>
37#include <sys/sysctl.h>
38#include <sys/time.h>
39#include <sys/vnode.h>
40
41#include <netinet/in.h>
42
43#include <err.h>
44#include <kvm.h>
45#include <stdio.h>
46#include <stdlib.h>
47
48#define ZFS
49#include "libprocstat.h"
50#include "common_kvm.h"
51#include "zfs_defs.h"
52
53int
54zfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn)
55{
56
57	struct mount mount, *mountptr;
58	void *znodeptr;
59	char *dataptr;
60	size_t len;
61	int size;
62
63	len = sizeof(size);
64	if (sysctlbyname("debug.sizeof.znode", &size, &len, NULL, 0) == -1) {
65		warnx("error getting sysctl");
66		return (1);
67	}
68	dataptr = malloc(size);
69	if (dataptr == NULL) {
70		warnx("error allocating memory for znode storage");
71		return (1);
72	}
73
74	if ((size_t)size < offsetof_z_id + sizeof(uint64_t) ||
75	    (size_t)size < offsetof_z_mode + sizeof(mode_t) ||
76	    (size_t)size < offsetof_z_size + sizeof(uint64_t)) {
77		warnx("znode_t size is too small");
78		goto bad;
79	}
80
81	if ((size_t)size != sizeof_znode_t)
82		warnx("znode_t size mismatch, data could be wrong");
83
84	/* Since we have problems including vnode.h, we'll use the wrappers. */
85	znodeptr = getvnodedata(vp);
86	if (!kvm_read_all(kd, (unsigned long)znodeptr, dataptr,
87	    (size_t)size)) {
88		warnx("can't read znode at %p", (void *)znodeptr);
89		goto bad;
90	}
91
92	/* Get the mount pointer, and read from the address. */
93	mountptr = getvnodemount(vp);
94	if (!kvm_read_all(kd, (unsigned long)mountptr, &mount, sizeof(mount))) {
95		warnx("can't read mount at %p", (void *)mountptr);
96		goto bad;
97	}
98
99	/*
100	 * XXX Assume that this is a znode, but it can be a special node
101	 * under .zfs/.
102	 */
103	vn->vn_fsid = mount.mnt_stat.f_fsid.val[0];
104	vn->vn_fileid = *(uint64_t *)(void *)(dataptr + offsetof_z_id);
105	vn->vn_mode = *(mode_t *)(void *)(dataptr + offsetof_z_mode);
106	vn->vn_size = *(uint64_t *)(void *)(dataptr + offsetof_z_size);
107	free(dataptr);
108	return (0);
109bad:
110	free(dataptr);
111	return (1);
112}
113