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