common_kvm.c revision 331722 
1/*-
2 * Copyright (c) 2009 Stanislav Sedov <stas@FreeBSD.org>
3 * Copyright (c) 1988, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *	This product includes software developed by the University of
17 *	California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: stable/11/lib/libprocstat/common_kvm.c 331722 2018-03-29 02:50:57Z eadler $");
37
38#include <sys/param.h>
39#include <sys/user.h>
40#include <sys/stat.h>
41#include <sys/vnode.h>
42#include <sys/conf.h>
43#define	_KERNEL
44#include <sys/pipe.h>
45#include <sys/mount.h>
46#include <ufs/ufs/quota.h>
47#include <ufs/ufs/inode.h>
48#include <ufs/ufs/extattr.h>
49#include <ufs/ufs/ufsmount.h>
50#include <fs/devfs/devfs.h>
51#include <fs/devfs/devfs_int.h>
52#undef _KERNEL
53#include <nfs/nfsproto.h>
54#include <nfsclient/nfs.h>
55#include <nfsclient/nfsnode.h>
56
57#include <assert.h>
58#include <err.h>
59#include <kvm.h>
60#include <stddef.h>
61#include <string.h>
62
63#include <libprocstat.h>
64#include "common_kvm.h"
65
66int
67kvm_read_all(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes)
68{
69	ssize_t error;
70
71	if (nbytes >= SSIZE_MAX)
72		return (0);
73	error = kvm_read(kd, addr, buf, nbytes);
74	return (error == (ssize_t)(nbytes));
75}
76
77int
78kdevtoname(kvm_t *kd, struct cdev *dev, char *buf)
79{
80	struct cdev si;
81
82	assert(buf);
83	if (!kvm_read_all(kd, (unsigned long)dev, &si, sizeof(si)))
84		return (1);
85	strlcpy(buf, si.si_name, SPECNAMELEN + 1);
86	return (0);
87}
88
89int
90ufs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn)
91{
92	struct inode inode;
93	struct ufsmount um;
94
95	if (!kvm_read_all(kd, (unsigned long)VTOI(vp), &inode, sizeof(inode))) {
96		warnx("can't read inode at %p", (void *)VTOI(vp));
97		return (1);
98	}
99	if (!kvm_read_all(kd, (unsigned long)inode.i_ump, &um, sizeof(um))) {
100		warnx("can't read ufsmount at %p", (void *)inode.i_ump);
101		return (1);
102	}
103	/*
104	 * The st_dev from stat(2) is a dev_t. These kernel structures
105	 * contain cdev pointers. We need to convert to dev_t to make
106	 * comparisons
107	 */
108	vn->vn_fsid = dev2udev(kd, um.um_dev);
109	vn->vn_fileid = inode.i_number;
110	vn->vn_mode = (mode_t)inode.i_mode;
111	vn->vn_size = inode.i_size;
112	return (0);
113}
114
115int
116devfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn)
117{
118	struct devfs_dirent devfs_dirent;
119	struct mount mount;
120
121	if (!kvm_read_all(kd, (unsigned long)getvnodedata(vp), &devfs_dirent,
122	    sizeof(devfs_dirent))) {
123		warnx("can't read devfs_dirent at %p",
124		    (void *)vp->v_data);
125		return (1);
126	}
127	if (!kvm_read_all(kd, (unsigned long)getvnodemount(vp), &mount,
128	    sizeof(mount))) {
129		warnx("can't read mount at %p",
130		    (void *)getvnodemount(vp));
131		return (1);
132	}
133	vn->vn_fsid = mount.mnt_stat.f_fsid.val[0];
134	vn->vn_fileid = devfs_dirent.de_inode;
135	vn->vn_mode = (devfs_dirent.de_mode & ~S_IFMT) | S_IFCHR;
136	vn->vn_size = 0;
137	return (0);
138}
139
140int
141nfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn)
142{
143	struct nfsnode nfsnode;
144	mode_t mode;
145
146	if (!kvm_read_all(kd, (unsigned long)VTONFS(vp), &nfsnode,
147	    sizeof(nfsnode))) {
148		warnx("can't read nfsnode at %p",
149		    (void *)VTONFS(vp));
150		return (1);
151	}
152	vn->vn_fsid = nfsnode.n_vattr.va_fsid;
153	vn->vn_fileid = nfsnode.n_vattr.va_fileid;
154	vn->vn_size = nfsnode.n_size;
155	mode = (mode_t)nfsnode.n_vattr.va_mode;
156	switch (vp->v_type) {
157	case VREG:
158		mode |= S_IFREG;
159		break;
160	case VDIR:
161		mode |= S_IFDIR;
162		break;
163	case VBLK:
164		mode |= S_IFBLK;
165		break;
166	case VCHR:
167		mode |= S_IFCHR;
168		break;
169	case VLNK:
170		mode |= S_IFLNK;
171		break;
172	case VSOCK:
173		mode |= S_IFSOCK;
174		break;
175	case VFIFO:
176		mode |= S_IFIFO;
177		break;
178	default:
179		break;
180	};
181	vn->vn_mode = mode;
182	return (0);
183}
184
185/*
186 * Read the cdev structure in the kernel in order to work out the
187 * associated dev_t
188 */
189dev_t
190dev2udev(kvm_t *kd, struct cdev *dev)
191{
192	struct cdev_priv priv;
193
194	assert(kd);
195	if (kvm_read_all(kd, (unsigned long)cdev2priv(dev), &priv,
196	    sizeof(priv))) {
197		return ((dev_t)priv.cdp_inode);
198	} else {
199		warnx("can't convert cdev *%p to a dev_t\n", dev);
200		return (-1);
201	}
202}
203
204void *
205getvnodedata(struct vnode *vp)
206{
207	return (vp->v_data);
208}
209
210struct mount *
211getvnodemount(struct vnode *vp)
212{
213	return (vp->v_mount);
214}
215