1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 2000 Peter Edwards
5 * Copyright (c) 1988, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by Peter Edwards
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD$");
41
42#include <sys/param.h>
43#include <sys/time.h>
44#include <sys/stat.h>
45#include <sys/vnode.h>
46
47#include <netinet/in.h>
48
49#define	_KERNEL
50#include <sys/mount.h>
51#include <fs/msdosfs/bpb.h>
52#include <fs/msdosfs/msdosfsmount.h>
53#undef _KERNEL
54
55#include <fs/msdosfs/denode.h>
56#include <fs/msdosfs/direntry.h>
57#include <fs/msdosfs/fat.h>
58
59#include <err.h>
60#include <kvm.h>
61#include <stdio.h>
62#include <stdlib.h>
63
64/*
65 * XXX -
66 * VTODE is defined in denode.h only if _KERNEL is defined, but that leads to
67 * header explosion
68 */
69#define VTODE(vp) ((struct denode *)getvnodedata(vp))
70
71#include "libprocstat.h"
72#include "common_kvm.h"
73
74struct dosmount {
75	struct dosmount *next;
76	struct msdosfsmount *kptr;	/* Pointer in kernel space */
77	struct msdosfsmount data;	/* User space copy of structure */
78};
79
80int
81msdosfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn)
82{
83	struct denode denode;
84	static struct dosmount *mounts;
85	struct dosmount *mnt;
86	u_long dirsperblk;
87	int fileid;
88
89	if (!kvm_read_all(kd, (unsigned long)VTODE(vp), &denode,
90	    sizeof(denode))) {
91		warnx("can't read denode at %p", (void *)VTODE(vp));
92		return (1);
93	}
94
95	/*
96	 * Find msdosfsmount structure for the vnode's filesystem. Needed
97	 * for some filesystem parameters
98	 */
99	for (mnt = mounts; mnt; mnt = mnt->next)
100		if (mnt->kptr == denode.de_pmp)
101			break;
102
103	if (!mnt) {
104		if ((mnt = malloc(sizeof(struct dosmount))) == NULL) {
105			warn("malloc()");
106			return (1);
107		}
108		if (!kvm_read_all(kd, (unsigned long)denode.de_pmp,
109		    &mnt->data, sizeof(mnt->data))) {
110			free(mnt);
111			    warnx("can't read mount info at %p",
112			    (void *)denode.de_pmp);
113			return (1);
114		}
115		mnt->next = mounts;
116		mounts = mnt;
117		mnt->kptr = denode.de_pmp;
118	}
119
120	vn->vn_fsid = dev2udev(kd, mnt->data.pm_dev);
121	vn->vn_mode = 0555;
122	vn->vn_mode |= denode.de_Attributes & ATTR_READONLY ? 0 : 0222;
123	vn->vn_mode &= mnt->data.pm_mask;
124
125	/* Distinguish directories and files. No "special" files in FAT. */
126	vn->vn_mode |= denode.de_Attributes & ATTR_DIRECTORY ? S_IFDIR : S_IFREG;
127	vn->vn_size = denode.de_FileSize;
128
129	/*
130	 * XXX -
131	 * Culled from msdosfs_vnops.c. There appears to be a problem
132	 * here, in that a directory has the same inode number as the first
133	 * file in the directory. stat(2) suffers from this problem also, so
134	 * I won't try to fix it here.
135	 *
136	 * The following computation of the fileid must be the same as that
137	 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
138	 * doesn't work.
139	 */
140	dirsperblk = mnt->data.pm_BytesPerSec / sizeof(struct direntry);
141	if (denode.de_Attributes & ATTR_DIRECTORY) {
142		fileid = cntobn(&mnt->data, denode.de_StartCluster)
143		    * dirsperblk;
144		if (denode.de_StartCluster == MSDOSFSROOT)
145			fileid = 1;
146	} else {
147		fileid = cntobn(&mnt->data, denode.de_dirclust) * dirsperblk;
148		if (denode.de_dirclust == MSDOSFSROOT)
149			fileid = roottobn(&mnt->data, 0) * dirsperblk;
150		fileid += denode.de_diroffset / sizeof(struct direntry);
151	}
152
153	vn->vn_fileid = fileid;
154	return (0);
155}
156