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 #include <stdbool.h> 41 42 #include <sys/param.h> 43 #include <sys/buf.h> 44 #include <sys/time.h> 45 #include <sys/stat.h> 46 #include <sys/vnode.h> 47 48 #include <netinet/in.h> 49 50 #define _KERNEL 51 #include <sys/mount.h> 52 #include <fs/msdosfs/bpb.h> 53 #include <fs/msdosfs/msdosfsmount.h> 54 #undef _KERNEL 55 56 #include <fs/msdosfs/denode.h> 57 #include <fs/msdosfs/direntry.h> 58 #include <fs/msdosfs/fat.h> 59 60 #include <err.h> 61 #include <kvm.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 65 /* 66 * XXX - 67 * VTODE is defined in denode.h only if _KERNEL is defined, but that leads to 68 * header explosion 69 */ 70 #define VTODE(vp) ((struct denode *)getvnodedata(vp)) 71 72 #include "libprocstat.h" 73 #include "common_kvm.h" 74 75 struct dosmount { 76 struct dosmount *next; 77 struct msdosfsmount *kptr; /* Pointer in kernel space */ 78 struct msdosfsmount data; /* User space copy of structure */ 79 }; 80 81 int 82 msdosfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn) 83 { 84 struct denode denode; 85 static struct dosmount *mounts; 86 struct dosmount *mnt; 87 u_long dirsperblk; 88 int fileid; 89 90 if (!kvm_read_all(kd, (unsigned long)VTODE(vp), &denode, 91 sizeof(denode))) { 92 warnx("can't read denode at %p", (void *)VTODE(vp)); 93 return (1); 94 } 95 96 /* 97 * Find msdosfsmount structure for the vnode's filesystem. Needed 98 * for some filesystem parameters 99 */ 100 for (mnt = mounts; mnt; mnt = mnt->next) 101 if (mnt->kptr == denode.de_pmp) 102 break; 103 104 if (!mnt) { 105 if ((mnt = malloc(sizeof(struct dosmount))) == NULL) { 106 warn("malloc()"); 107 return (1); 108 } 109 if (!kvm_read_all(kd, (unsigned long)denode.de_pmp, 110 &mnt->data, sizeof(mnt->data))) { 111 free(mnt); 112 warnx("can't read mount info at %p", 113 (void *)denode.de_pmp); 114 return (1); 115 } 116 mnt->next = mounts; 117 mounts = mnt; 118 mnt->kptr = denode.de_pmp; 119 } 120 121 vn->vn_fsid = dev2udev(kd, mnt->data.pm_dev); 122 vn->vn_mode = 0555; 123 vn->vn_mode |= denode.de_Attributes & ATTR_READONLY ? 0 : 0222; 124 vn->vn_mode &= mnt->data.pm_mask; 125 126 /* Distinguish directories and files. No "special" files in FAT. */ 127 vn->vn_mode |= denode.de_Attributes & ATTR_DIRECTORY ? S_IFDIR : S_IFREG; 128 vn->vn_size = denode.de_FileSize; 129 130 /* 131 * XXX - 132 * Culled from msdosfs_vnops.c. There appears to be a problem 133 * here, in that a directory has the same inode number as the first 134 * file in the directory. stat(2) suffers from this problem also, so 135 * I won't try to fix it here. 136 * 137 * The following computation of the fileid must be the same as that 138 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 139 * doesn't work. 140 */ 141 dirsperblk = mnt->data.pm_BytesPerSec / sizeof(struct direntry); 142 if (denode.de_Attributes & ATTR_DIRECTORY) { 143 fileid = cntobn(&mnt->data, denode.de_StartCluster) 144 * dirsperblk; 145 if (denode.de_StartCluster == MSDOSFSROOT) 146 fileid = 1; 147 } else { 148 fileid = cntobn(&mnt->data, denode.de_dirclust) * dirsperblk; 149 if (denode.de_dirclust == MSDOSFSROOT) 150 fileid = roottobn(&mnt->data, 0) * dirsperblk; 151 fileid += denode.de_diroffset / sizeof(struct direntry); 152 } 153 154 vn->vn_fileid = fileid; 155 return (0); 156 } 157