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 <sys/param.h>
30 #define _WANT_MOUNT
31 #include <sys/mount.h>
32 #include <sys/queue.h>
33 #include <sys/stat.h>
34 #include <sys/sysctl.h>
35 #include <sys/time.h>
36 #include <sys/vnode.h>
37 #define _WANT_ZNODE
38 #include <sys/zfs_context.h>
39 #include <sys/zfs_znode.h>
40
41 #include <netinet/in.h>
42
43 #include <err.h>
44 #include <kvm.h>
45 #include <stdbool.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48
49 #define ZFS
50 #include "libprocstat.h"
51 #include "common_kvm.h"
52
53 int
zfs_filestat(kvm_t * kd,struct vnode * vp,struct vnstat * vn)54 zfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn)
55 {
56
57 struct mount mount, *mountptr;
58 znode_t *kznodeptr, *znode;
59 size_t len;
60 int size;
61
62 len = sizeof(size);
63 if (sysctlbyname("debug.sizeof.znode", &size, &len, NULL, 0) == -1) {
64 warnx("error getting sysctl");
65 return (1);
66 }
67 znode = malloc(size);
68 if (znode == NULL) {
69 warnx("error allocating memory for znode storage");
70 return (1);
71 }
72
73 if ((size_t)size != sizeof(znode_t))
74 warnx("znode_t size mismatch, data could be wrong");
75
76 if ((size_t)size < offsetof(znode_t, z_id) + sizeof(znode->z_id) ||
77 (size_t)size < offsetof(znode_t, z_mode) + sizeof(znode->z_mode) ||
78 (size_t)size < offsetof(znode_t, z_size) + sizeof(znode->z_size)) {
79 warnx("znode_t size is too small");
80 goto bad;
81 }
82
83 /*
84 * OpenZFS's libspl provides a dummy sys/vnode.h that shadows ours so
85 * struct vnode is an incomplete type. Use the wrapper until that is
86 * resolved.
87 */
88 kznodeptr = getvnodedata(vp);
89 if (!kvm_read_all(kd, (unsigned long)kznodeptr, znode, (size_t)size)) {
90 warnx("can't read znode at %p", (void *)kznodeptr);
91 goto bad;
92 }
93
94 /* Get the mount pointer, and read from the address. */
95 mountptr = getvnodemount(vp);
96 if (!kvm_read_all(kd, (unsigned long)mountptr, &mount, sizeof(mount))) {
97 warnx("can't read mount at %p", (void *)mountptr);
98 goto bad;
99 }
100
101 /*
102 * XXX Assume that this is a znode, but it can be a special node
103 * under .zfs/.
104 */
105 vn->vn_fsid = mount.mnt_stat.f_fsid.val[0];
106 vn->vn_fileid = znode->z_id;
107 vn->vn_mode = znode->z_mode;
108 vn->vn_size = znode->z_size;
109 return (0);
110 bad:
111 return (1);
112 }
113