1/*-
2 * Copyright (c) 2007 Ulf Lilleengen
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#include <sys/param.h>
30#define _KERNEL
31#include <sys/mount.h>
32#include <sys/taskqueue.h>
33#undef _KERNEL
34#include <sys/sysctl.h>
35
36#undef lbolt
37#undef lbolt64
38#undef gethrestime_sec
39#include <sys/zfs_context.h>
40#include <sys/spa.h>
41#include <sys/spa_impl.h>
42#include <sys/dmu.h>
43#include <sys/zap.h>
44#include <sys/fs/zfs.h>
45#include <sys/zfs_znode.h>
46#include <sys/zfs_sa.h>
47
48#include <netinet/in.h>
49
50#include <err.h>
51#include <kvm.h>
52#include <stdio.h>
53#include <stdlib.h>
54
55#define ZFS
56#include "libprocstat.h"
57#include "common_kvm.h"
58
59/*
60 * Offset calculations that are used to get data from znode without having the
61 * definition.
62 */
63#define LOCATION_ZID (2 * sizeof(void *))
64#define LOCATION_ZPHYS(zsize) ((zsize) - (2 * sizeof(void *) + sizeof(struct task)))
65
66int
67zfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn)
68{
69
70	znode_phys_t zphys;
71	struct mount mount, *mountptr;
72	uint64_t *zid;
73	void *znodeptr, *vnodeptr;
74	char *dataptr;
75	void *zphys_addr;
76	size_t len;
77	int size;
78
79	len = sizeof(size);
80	if (sysctlbyname("debug.sizeof.znode", &size, &len, NULL, 0) == -1) {
81		warnx("error getting sysctl");
82		return (1);
83	}
84	znodeptr = malloc(size);
85	if (znodeptr == NULL) {
86		warnx("error allocating memory for znode storage");
87		return (1);
88	}
89	/* Since we have problems including vnode.h, we'll use the wrappers. */
90	vnodeptr = getvnodedata(vp);
91	if (!kvm_read_all(kd, (unsigned long)vnodeptr, znodeptr,
92	    (size_t)size)) {
93		warnx("can't read znode at %p", (void *)vnodeptr);
94		goto bad;
95	}
96
97	/*
98	 * z_id field is stored in the third pointer. We therefore skip the two
99	 * first bytes.
100	 *
101	 * Pointer to the z_phys structure is the next last pointer. Therefore
102	 * go back two bytes from the end.
103	 */
104	dataptr = znodeptr;
105	zid = (uint64_t *)(dataptr + LOCATION_ZID);
106	zphys_addr = *(void **)(dataptr + LOCATION_ZPHYS(size));
107
108	if (!kvm_read_all(kd, (unsigned long)zphys_addr, &zphys,
109	    sizeof(zphys))) {
110		warnx("can't read znode_phys at %p", zphys_addr);
111		goto bad;
112	}
113
114	/* Get the mount pointer, and read from the address. */
115	mountptr = getvnodemount(vp);
116	if (!kvm_read_all(kd, (unsigned long)mountptr, &mount, sizeof(mount))) {
117		warnx("can't read mount at %p", (void *)mountptr);
118		goto bad;
119	}
120	vn->vn_fsid = mount.mnt_stat.f_fsid.val[0];
121	vn->vn_fileid = *zid;
122	/*
123	 * XXX: Shows up wrong in output, but UFS has this error too. Could
124	 * be that we're casting mode-variables from 64-bit to 8-bit or simply
125	 * error in the mode-to-string function.
126	 */
127	vn->vn_mode = (mode_t)zphys.zp_mode;
128	vn->vn_size = (u_long)zphys.zp_size;
129	free(znodeptr);
130	return (0);
131bad:
132	free(znodeptr);
133	return (1);
134}
135