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 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/time.h> 42 #include <sys/stat.h> 43 #include <sys/vnode.h> 44 45 #include <netinet/in.h> 46 47 #define _KERNEL 48 #include <sys/mount.h> 49 #include <fs/msdosfs/bpb.h> 50 #include <fs/msdosfs/msdosfsmount.h> 51 #undef _KERNEL 52 53 #include <fs/msdosfs/denode.h> 54 #include <fs/msdosfs/direntry.h> 55 #include <fs/msdosfs/fat.h> 56 57 #include <err.h> 58 #include <kvm.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 62 /* 63 * XXX - 64 * VTODE is defined in denode.h only if _KERNEL is defined, but that leads to 65 * header explosion 66 */ 67 #define VTODE(vp) ((struct denode *)getvnodedata(vp)) 68 69 #include "libprocstat.h" 70 #include "common_kvm.h" 71 72 struct dosmount { 73 struct dosmount *next; 74 struct msdosfsmount *kptr; /* Pointer in kernel space */ 75 struct msdosfsmount data; /* User space copy of structure */ 76 }; 77 78 int 79 msdosfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn) 80 { 81 struct denode denode; 82 static struct dosmount *mounts; 83 struct dosmount *mnt; 84 u_long dirsperblk; 85 int fileid; 86 87 if (!kvm_read_all(kd, (unsigned long)VTODE(vp), &denode, 88 sizeof(denode))) { 89 warnx("can't read denode at %p", (void *)VTODE(vp)); 90 return (1); 91 } 92 93 /* 94 * Find msdosfsmount structure for the vnode's filesystem. Needed 95 * for some filesystem parameters 96 */ 97 for (mnt = mounts; mnt; mnt = mnt->next) 98 if (mnt->kptr == denode.de_pmp) 99 break; 100 101 if (!mnt) { 102 if ((mnt = malloc(sizeof(struct dosmount))) == NULL) { 103 warn("malloc()"); 104 return (1); 105 } 106 if (!kvm_read_all(kd, (unsigned long)denode.de_pmp, 107 &mnt->data, sizeof(mnt->data))) { 108 free(mnt); 109 warnx("can't read mount info at %p", 110 (void *)denode.de_pmp); 111 return (1); 112 } 113 mnt->next = mounts; 114 mounts = mnt; 115 mnt->kptr = denode.de_pmp; 116 } 117 118 vn->vn_fsid = dev2udev(kd, mnt->data.pm_dev); 119 vn->vn_mode = 0555; 120 vn->vn_mode |= denode.de_Attributes & ATTR_READONLY ? 0 : 0222; 121 vn->vn_mode &= mnt->data.pm_mask; 122 123 /* Distinguish directories and files. No "special" files in FAT. */ 124 vn->vn_mode |= denode.de_Attributes & ATTR_DIRECTORY ? S_IFDIR : S_IFREG; 125 vn->vn_size = denode.de_FileSize; 126 127 /* 128 * XXX - 129 * Culled from msdosfs_vnops.c. There appears to be a problem 130 * here, in that a directory has the same inode number as the first 131 * file in the directory. stat(2) suffers from this problem also, so 132 * I won't try to fix it here. 133 * 134 * The following computation of the fileid must be the same as that 135 * used in msdosfs_readdir() to compute d_fileno. If not, pwd 136 * doesn't work. 137 */ 138 dirsperblk = mnt->data.pm_BytesPerSec / sizeof(struct direntry); 139 if (denode.de_Attributes & ATTR_DIRECTORY) { 140 fileid = cntobn(&mnt->data, denode.de_StartCluster) 141 * dirsperblk; 142 if (denode.de_StartCluster == MSDOSFSROOT) 143 fileid = 1; 144 } else { 145 fileid = cntobn(&mnt->data, denode.de_dirclust) * dirsperblk; 146 if (denode.de_dirclust == MSDOSFSROOT) 147 fileid = roottobn(&mnt->data, 0) * dirsperblk; 148 fileid += denode.de_diroffset / sizeof(struct direntry); 149 } 150 151 vn->vn_fileid = fileid; 152 return (0); 153 } 154