2 * Copyright (c) 2000 Peter Edwards
3 * Copyright (c) 1988, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by Peter Edwards
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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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
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36 * $FreeBSD: src/usr.bin/fstat/msdosfs.c,v 1.1.2.2 2001/11/21 10:49:37 dwmalone Exp $
39 #include <sys/param.h>
42 #include <sys/vnode.h>
45 #include <sys/mount.h>
46 #include <msdosfs/bpb.h>
47 #include <msdosfs/msdosfsmount.h>
50 #include <msdosfs/denode.h>
51 #include <msdosfs/direntry.h>
52 #include <msdosfs/fat.h>
61 * VTODE is defined in denode.h only if _KERNEL is defined, but that leads to
64 #define VTODE(vp) ((struct denode *)(vp)->v_data)
69 struct dosmount *next;
70 struct msdosfsmount *kptr; /* Pointer in kernel space */
71 struct msdosfsmount data; /* User space copy of structure */
75 msdosfs_filestat(vp, fsp)
80 static struct dosmount *mounts;
85 if (!KVM_READ(VTODE(vp), &denode, sizeof (denode))) {
86 dprintf(stderr, "can't read denode at %p for pid %d\n",
87 (void *)VTODE(vp), Pid);
92 * Find msdosfsmount structure for the vnode's filesystem. Needed
93 * for some filesystem parameters
95 for (mnt = mounts; mnt; mnt = mnt->next)
96 if (mnt->kptr == denode.de_pmp)
100 if ((mnt = malloc(sizeof(struct dosmount))) == NULL)
104 mnt->kptr = denode.de_pmp;
105 if (!KVM_READ(denode.de_pmp, &mnt->data, sizeof mnt->data)) {
107 "can't read mount info at %p for pid %d\n",
108 (void *)denode.de_pmp, Pid);
113 fsp->fsid = dev2udev(denode.de_dev);
115 fsp->mode |= denode.de_Attributes & ATTR_READONLY ? 0 : 0222;
116 fsp->mode &= mnt->data.pm_mask;
118 /* Distinguish directories and files. No "special" files in FAT. */
119 fsp->mode |= denode.de_Attributes & ATTR_DIRECTORY ? S_IFDIR : S_IFREG;
121 fsp->size = denode.de_FileSize;
122 fsp->rdev = denode.de_dev;
126 * Culled from msdosfs_vnops.c. There appears to be a problem
127 * here, in that a directory has the same inode number as the first
128 * file in the directory. stat(2) suffers from this problem also, so
129 * I won't try to fix it here.
131 * The following computation of the fileid must be the same as that
132 * used in msdosfs_readdir() to compute d_fileno. If not, pwd
135 dirsperblk = mnt->data.pm_BytesPerSec / sizeof(struct direntry);
136 if (denode.de_Attributes & ATTR_DIRECTORY) {
137 fileid = cntobn(&mnt->data, denode.de_StartCluster)
139 if (denode.de_StartCluster == MSDOSFSROOT)
142 fileid = cntobn(&mnt->data, denode.de_dirclust) * dirsperblk;
143 if (denode.de_dirclust == MSDOSFSROOT)
144 fileid = roottobn(&mnt->data, 0) * dirsperblk;
145 fileid += denode.de_diroffset / sizeof(struct direntry);
148 fsp->fileid = fileid;