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#include <stdbool.h>
41
42#include <sys/param.h>
43#include <sys/buf.h>
44#include <sys/time.h>
45#include <sys/stat.h>
46#include <sys/vnode.h>
47
48#include <netinet/in.h>
49
50#define	_KERNEL
51#include <sys/mount.h>
52#include <fs/msdosfs/bpb.h>
53#include <fs/msdosfs/msdosfsmount.h>
54#undef _KERNEL
55
56#include <fs/msdosfs/denode.h>
57#include <fs/msdosfs/direntry.h>
58#include <fs/msdosfs/fat.h>
59
60#include <err.h>
61#include <kvm.h>
62#include <stdio.h>
63#include <stdlib.h>
64
65/*
66 * XXX -
67 * VTODE is defined in denode.h only if _KERNEL is defined, but that leads to
68 * header explosion
69 */
70#define VTODE(vp) ((struct denode *)getvnodedata(vp))
71
72#include "libprocstat.h"
73#include "common_kvm.h"
74
75struct dosmount {
76	struct dosmount *next;
77	struct msdosfsmount *kptr;	/* Pointer in kernel space */
78	struct msdosfsmount data;	/* User space copy of structure */
79};
80
81int
82msdosfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn)
83{
84	struct denode denode;
85	static struct dosmount *mounts;
86	struct dosmount *mnt;
87	u_long dirsperblk;
88	int fileid;
89
90	if (!kvm_read_all(kd, (unsigned long)VTODE(vp), &denode,
91	    sizeof(denode))) {
92		warnx("can't read denode at %p", (void *)VTODE(vp));
93		return (1);
94	}
95
96	/*
97	 * Find msdosfsmount structure for the vnode's filesystem. Needed
98	 * for some filesystem parameters
99	 */
100	for (mnt = mounts; mnt; mnt = mnt->next)
101		if (mnt->kptr == denode.de_pmp)
102			break;
103
104	if (!mnt) {
105		if ((mnt = malloc(sizeof(struct dosmount))) == NULL) {
106			warn("malloc()");
107			return (1);
108		}
109		if (!kvm_read_all(kd, (unsigned long)denode.de_pmp,
110		    &mnt->data, sizeof(mnt->data))) {
111			free(mnt);
112			    warnx("can't read mount info at %p",
113			    (void *)denode.de_pmp);
114			return (1);
115		}
116		mnt->next = mounts;
117		mounts = mnt;
118		mnt->kptr = denode.de_pmp;
119	}
120
121	vn->vn_fsid = dev2udev(kd, mnt->data.pm_dev);
122	vn->vn_mode = 0555;
123	vn->vn_mode |= denode.de_Attributes & ATTR_READONLY ? 0 : 0222;
124	vn->vn_mode &= mnt->data.pm_mask;
125
126	/* Distinguish directories and files. No "special" files in FAT. */
127	vn->vn_mode |= denode.de_Attributes & ATTR_DIRECTORY ? S_IFDIR : S_IFREG;
128	vn->vn_size = denode.de_FileSize;
129
130	/*
131	 * XXX -
132	 * Culled from msdosfs_vnops.c. There appears to be a problem
133	 * here, in that a directory has the same inode number as the first
134	 * file in the directory. stat(2) suffers from this problem also, so
135	 * I won't try to fix it here.
136	 *
137	 * The following computation of the fileid must be the same as that
138	 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
139	 * doesn't work.
140	 */
141	dirsperblk = mnt->data.pm_BytesPerSec / sizeof(struct direntry);
142	if (denode.de_Attributes & ATTR_DIRECTORY) {
143		fileid = cntobn(&mnt->data, denode.de_StartCluster)
144		    * dirsperblk;
145		if (denode.de_StartCluster == MSDOSFSROOT)
146			fileid = 1;
147	} else {
148		fileid = cntobn(&mnt->data, denode.de_dirclust) * dirsperblk;
149		if (denode.de_dirclust == MSDOSFSROOT)
150			fileid = roottobn(&mnt->data, 0) * dirsperblk;
151		fileid += denode.de_diroffset / sizeof(struct direntry);
152	}
153
154	vn->vn_fileid = fileid;
155	return (0);
156}
157