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