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 * $DragonFly: src/usr.bin/fstat/msdosfs.c,v 1.4 2003/09/10 22:45:50 rob Exp $ 38 */ 39 40 #define _KERNEL_STRUCTURES 41 42 #include <sys/param.h> 43 #include <sys/time.h> 44 #include <sys/stat.h> 45 #include <sys/vnode.h> 46 47 #include <sys/mount.h> 48 #include <vfs/msdosfs/bpb.h> 49 #include <vfs/msdosfs/msdosfsmount.h> 50 51 #include <vfs/msdosfs/denode.h> 52 #include <vfs/msdosfs/direntry.h> 53 #include <vfs/msdosfs/fat.h> 54 55 #include <err.h> 56 #include <kvm.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 60 /* 61 * XXX - 62 * VTODE is defined in denode.h only if _KERNEL is defined, but that leads to 63 * header explosion 64 */ 65 #define VTODE(vp) ((struct denode *)(vp)->v_data) 66 67 #include "fstat.h" 68 69 struct dosmount { 70 struct dosmount *next; 71 struct msdosfsmount *kptr; /* Pointer in kernel space */ 72 struct msdosfsmount data; /* User space copy of structure */ 73 }; 74 75 int 76 msdosfs_filestat(vp, fsp) 77 struct vnode *vp; 78 struct filestat *fsp; 79 { 80 struct denode denode; 81 static struct dosmount *mounts; 82 struct dosmount *mnt; 83 u_long dirsperblk; 84 int fileid; 85 86 if (!KVM_READ(VTODE(vp), &denode, sizeof (denode))) { 87 dprintf(stderr, "can't read denode at %p for pid %d\n", 88 (void *)VTODE(vp), Pid); 89 return 0; 90 } 91 92 /* 93 * Find msdosfsmount structure for the vnode's filesystem. Needed 94 * for some filesystem parameters 95 */ 96 for (mnt = mounts; mnt; mnt = mnt->next) 97 if (mnt->kptr == denode.de_pmp) 98 break; 99 100 if (!mnt) { 101 if ((mnt = malloc(sizeof(struct dosmount))) == NULL) 102 err(1, NULL); 103 mnt->next = mounts; 104 mounts = mnt; 105 mnt->kptr = denode.de_pmp; 106 if (!KVM_READ(denode.de_pmp, &mnt->data, sizeof mnt->data)) { 107 dprintf(stderr, 108 "can't read mount info at %p for pid %d\n", 109 (void *)denode.de_pmp, Pid); 110 return 0; 111 } 112 } 113 114 fsp->fsid = dev2udev(denode.de_dev); 115 fsp->mode = 0555; 116 fsp->mode |= denode.de_Attributes & ATTR_READONLY ? 0 : 0222; 117 fsp->mode &= mnt->data.pm_mask; 118 119 /* Distinguish directories and files. No "special" files in FAT. */ 120 fsp->mode |= denode.de_Attributes & ATTR_DIRECTORY ? S_IFDIR : S_IFREG; 121 122 fsp->size = denode.de_FileSize; 123 fsp->rdev = denode.de_dev; 124 125 /* 126 * XXX - 127 * Culled from msdosfs_vnops.c. There appears to be a problem 128 * here, in that a directory has the same inode number as the first 129 * file in the directory. stat(2) suffers from this problem also, so 130 * I won't try to fix it here. 131 * 132 * The following computation of the fileid must be the same as that 133 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 134 * doesn't work. 135 */ 136 dirsperblk = mnt->data.pm_BytesPerSec / sizeof(struct direntry); 137 if (denode.de_Attributes & ATTR_DIRECTORY) { 138 fileid = cntobn(&mnt->data, denode.de_StartCluster) 139 * dirsperblk; 140 if (denode.de_StartCluster == MSDOSFSROOT) 141 fileid = 1; 142 } else { 143 fileid = cntobn(&mnt->data, denode.de_dirclust) * dirsperblk; 144 if (denode.de_dirclust == MSDOSFSROOT) 145 fileid = roottobn(&mnt->data, 0) * dirsperblk; 146 fileid += denode.de_diroffset / sizeof(struct direntry); 147 } 148 149 fsp->fileid = fileid; 150 return 1; 151 } 152