1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2007 Ulf Lilleengen 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <stdbool.h> 30 31 #include <sys/param.h> 32 #define _KERNEL 33 #include <sys/mount.h> 34 #undef _KERNEL 35 #include <sys/queue.h> 36 #include <sys/stat.h> 37 #include <sys/sysctl.h> 38 #include <sys/time.h> 39 #include <sys/vnode.h> 40 41 #include <netinet/in.h> 42 43 #include <err.h> 44 #include <kvm.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 48 #define ZFS 49 #include "libprocstat.h" 50 #include "common_kvm.h" 51 #include "zfs_defs.h" 52 53 int 54 zfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn) 55 { 56 57 struct mount mount, *mountptr; 58 void *znodeptr; 59 char *dataptr; 60 size_t len; 61 int size; 62 63 len = sizeof(size); 64 if (sysctlbyname("debug.sizeof.znode", &size, &len, NULL, 0) == -1) { 65 warnx("error getting sysctl"); 66 return (1); 67 } 68 dataptr = malloc(size); 69 if (dataptr == NULL) { 70 warnx("error allocating memory for znode storage"); 71 return (1); 72 } 73 74 if ((size_t)size < offsetof_z_id + sizeof(uint64_t) || 75 (size_t)size < offsetof_z_mode + sizeof(mode_t) || 76 (size_t)size < offsetof_z_size + sizeof(uint64_t)) { 77 warnx("znode_t size is too small"); 78 goto bad; 79 } 80 81 if ((size_t)size != sizeof_znode_t) 82 warnx("znode_t size mismatch, data could be wrong"); 83 84 /* Since we have problems including vnode.h, we'll use the wrappers. */ 85 znodeptr = getvnodedata(vp); 86 if (!kvm_read_all(kd, (unsigned long)znodeptr, dataptr, 87 (size_t)size)) { 88 warnx("can't read znode at %p", (void *)znodeptr); 89 goto bad; 90 } 91 92 /* Get the mount pointer, and read from the address. */ 93 mountptr = getvnodemount(vp); 94 if (!kvm_read_all(kd, (unsigned long)mountptr, &mount, sizeof(mount))) { 95 warnx("can't read mount at %p", (void *)mountptr); 96 goto bad; 97 } 98 99 /* 100 * XXX Assume that this is a znode, but it can be a special node 101 * under .zfs/. 102 */ 103 vn->vn_fsid = mount.mnt_stat.f_fsid.val[0]; 104 vn->vn_fileid = *(uint64_t *)(void *)(dataptr + offsetof_z_id); 105 vn->vn_mode = *(mode_t *)(void *)(dataptr + offsetof_z_mode); 106 vn->vn_size = *(uint64_t *)(void *)(dataptr + offsetof_z_size); 107 free(dataptr); 108 return (0); 109 bad: 110 free(dataptr); 111 return (1); 112 } 113