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 * $FreeBSD: src/usr.bin/fstat/msdosfs.c,v 1.1.2.2 2001/11/21 10:49:37 dwmalone Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/time.h> 41 #include <sys/stat.h> 42 #include <sys/vnode.h> 43 44 #define _KERNEL 45 #include <sys/mount.h> 46 #include <msdosfs/bpb.h> 47 #include <msdosfs/msdosfsmount.h> 48 #undef _KERNEL 49 50 #include <msdosfs/denode.h> 51 #include <msdosfs/direntry.h> 52 #include <msdosfs/fat.h> 53 54 #include <err.h> 55 #include <kvm.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 59 /* 60 * XXX - 61 * VTODE is defined in denode.h only if _KERNEL is defined, but that leads to 62 * header explosion 63 */ 64 #define VTODE(vp) ((struct denode *)(vp)->v_data) 65 66 #include "fstat.h" 67 68 struct dosmount { 69 struct dosmount *next; 70 struct msdosfsmount *kptr; /* Pointer in kernel space */ 71 struct msdosfsmount data; /* User space copy of structure */ 72 }; 73 74 int 75 msdosfs_filestat(vp, fsp) 76 struct vnode *vp; 77 struct filestat *fsp; 78 { 79 struct denode denode; 80 static struct dosmount *mounts; 81 struct dosmount *mnt; 82 u_long dirsperblk; 83 int fileid; 84 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); 88 return 0; 89 } 90 91 /* 92 * Find msdosfsmount structure for the vnode's filesystem. Needed 93 * for some filesystem parameters 94 */ 95 for (mnt = mounts; mnt; mnt = mnt->next) 96 if (mnt->kptr == denode.de_pmp) 97 break; 98 99 if (!mnt) { 100 if ((mnt = malloc(sizeof(struct dosmount))) == NULL) 101 err(1, NULL); 102 mnt->next = mounts; 103 mounts = mnt; 104 mnt->kptr = denode.de_pmp; 105 if (!KVM_READ(denode.de_pmp, &mnt->data, sizeof mnt->data)) { 106 dprintf(stderr, 107 "can't read mount info at %p for pid %d\n", 108 (void *)denode.de_pmp, Pid); 109 return 0; 110 } 111 } 112 113 fsp->fsid = dev2udev(denode.de_dev); 114 fsp->mode = 0555; 115 fsp->mode |= denode.de_Attributes & ATTR_READONLY ? 0 : 0222; 116 fsp->mode &= mnt->data.pm_mask; 117 118 /* Distinguish directories and files. No "special" files in FAT. */ 119 fsp->mode |= denode.de_Attributes & ATTR_DIRECTORY ? S_IFDIR : S_IFREG; 120 121 fsp->size = denode.de_FileSize; 122 fsp->rdev = denode.de_dev; 123 124 /* 125 * XXX - 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. 130 * 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 133 * doesn't work. 134 */ 135 dirsperblk = mnt->data.pm_BytesPerSec / sizeof(struct direntry); 136 if (denode.de_Attributes & ATTR_DIRECTORY) { 137 fileid = cntobn(&mnt->data, denode.de_StartCluster) 138 * dirsperblk; 139 if (denode.de_StartCluster == MSDOSFSROOT) 140 fileid = 1; 141 } else { 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); 146 } 147 148 fsp->fileid = fileid; 149 return 1; 150 } 151