1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD$
29 */
30
31 #include <sys/param.h>
32 #define _KERNEL
33 #include <sys/mount.h>
34 #include <sys/taskqueue.h>
35 #undef _KERNEL
36 #include <sys/sysctl.h>
37
38 #undef lbolt
39 #undef lbolt64
40 #undef gethrestime_sec
41 #include <sys/zfs_context.h>
42 #include <sys/spa.h>
43 #include <sys/spa_impl.h>
44 #include <sys/dmu.h>
45 #include <sys/zap.h>
46 #include <sys/fs/zfs.h>
47 #include <sys/zfs_znode.h>
48 #include <sys/zfs_sa.h>
49
50 #include <netinet/in.h>
51
52 #include <err.h>
53 #include <kvm.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56
57 #define ZFS
58 #include "libprocstat.h"
59 #include "common_kvm.h"
60
61 /*
62 * Offset calculations that are used to get data from znode without having the
63 * definition.
64 */
65 #define LOCATION_ZID (2 * sizeof(void *))
66 #define LOCATION_ZPHYS(zsize) ((zsize) - (2 * sizeof(void *) + sizeof(struct task)))
67
68 int
zfs_filestat(kvm_t * kd,struct vnode * vp,struct vnstat * vn)69 zfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn)
70 {
71
72 znode_phys_t zphys;
73 struct mount mount, *mountptr;
74 uint64_t *zid;
75 void *znodeptr, *vnodeptr;
76 char *dataptr;
77 void *zphys_addr;
78 size_t len;
79 int size;
80
81 len = sizeof(size);
82 if (sysctlbyname("debug.sizeof.znode", &size, &len, NULL, 0) == -1) {
83 warnx("error getting sysctl");
84 return (1);
85 }
86 znodeptr = malloc(size);
87 if (znodeptr == NULL) {
88 warnx("error allocating memory for znode storage");
89 return (1);
90 }
91 /* Since we have problems including vnode.h, we'll use the wrappers. */
92 vnodeptr = getvnodedata(vp);
93 if (!kvm_read_all(kd, (unsigned long)vnodeptr, znodeptr,
94 (size_t)size)) {
95 warnx("can't read znode at %p", (void *)vnodeptr);
96 goto bad;
97 }
98
99 /*
100 * z_id field is stored in the third pointer. We therefore skip the two
101 * first bytes.
102 *
103 * Pointer to the z_phys structure is the next last pointer. Therefore
104 * go back two bytes from the end.
105 */
106 dataptr = znodeptr;
107 zid = (uint64_t *)(dataptr + LOCATION_ZID);
108 zphys_addr = *(void **)(dataptr + LOCATION_ZPHYS(size));
109
110 if (!kvm_read_all(kd, (unsigned long)zphys_addr, &zphys,
111 sizeof(zphys))) {
112 warnx("can't read znode_phys at %p", zphys_addr);
113 goto bad;
114 }
115
116 /* Get the mount pointer, and read from the address. */
117 mountptr = getvnodemount(vp);
118 if (!kvm_read_all(kd, (unsigned long)mountptr, &mount, sizeof(mount))) {
119 warnx("can't read mount at %p", (void *)mountptr);
120 goto bad;
121 }
122 vn->vn_fsid = mount.mnt_stat.f_fsid.val[0];
123 vn->vn_fileid = *zid;
124 /*
125 * XXX: Shows up wrong in output, but UFS has this error too. Could
126 * be that we're casting mode-variables from 64-bit to 8-bit or simply
127 * error in the mode-to-string function.
128 */
129 vn->vn_mode = (mode_t)zphys.zp_mode;
130 vn->vn_size = (u_long)zphys.zp_size;
131 free(znodeptr);
132 return (0);
133 bad:
134 free(znodeptr);
135 return (1);
136 }
137