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
74 struct dosmount {
75 struct dosmount *next;
76 struct msdosfsmount *kptr; /* Pointer in kernel space */
77 struct msdosfsmount data; /* User space copy of structure */
78 };
79
80 int
msdosfs_filestat(kvm_t * kd,struct vnode * vp,struct vnstat * vn)81 msdosfs_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