1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #define _KERNEL 33 #include <sys/mount.h> 34 #include <sys/taskqueue.h> 35 #undef _KERNEL 36 #include <sys/sysctl.h> 37 38 #undef lbolt 39 #undef lbolt64 40 #undef gethrestime_sec 41 #include <sys/zfs_context.h> 42 #include <sys/spa.h> 43 #include <sys/spa_impl.h> 44 #include <sys/dmu.h> 45 #include <sys/zap.h> 46 #include <sys/fs/zfs.h> 47 #include <sys/zfs_znode.h> 48 #include <sys/zfs_sa.h> 49 50 #include <netinet/in.h> 51 52 #include <err.h> 53 #include <kvm.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 57 #define ZFS 58 #include "libprocstat.h" 59 #include "common_kvm.h" 60 61 /* 62 * Offset calculations that are used to get data from znode without having the 63 * definition. 64 */ 65 #define LOCATION_ZID (2 * sizeof(void *)) 66 #define LOCATION_ZPHYS(zsize) ((zsize) - (2 * sizeof(void *) + sizeof(struct task))) 67 68 int 69 zfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn) 70 { 71 72 znode_phys_t zphys; 73 struct mount mount, *mountptr; 74 uint64_t *zid; 75 void *znodeptr, *vnodeptr; 76 char *dataptr; 77 void *zphys_addr; 78 size_t len; 79 int size; 80 81 len = sizeof(size); 82 if (sysctlbyname("debug.sizeof.znode", &size, &len, NULL, 0) == -1) { 83 warnx("error getting sysctl"); 84 return (1); 85 } 86 znodeptr = malloc(size); 87 if (znodeptr == NULL) { 88 warnx("error allocating memory for znode storage"); 89 return (1); 90 } 91 /* Since we have problems including vnode.h, we'll use the wrappers. */ 92 vnodeptr = getvnodedata(vp); 93 if (!kvm_read_all(kd, (unsigned long)vnodeptr, znodeptr, 94 (size_t)size)) { 95 warnx("can't read znode at %p", (void *)vnodeptr); 96 goto bad; 97 } 98 99 /* 100 * z_id field is stored in the third pointer. We therefore skip the two 101 * first bytes. 102 * 103 * Pointer to the z_phys structure is the next last pointer. Therefore 104 * go back two bytes from the end. 105 */ 106 dataptr = znodeptr; 107 zid = (uint64_t *)(dataptr + LOCATION_ZID); 108 zphys_addr = *(void **)(dataptr + LOCATION_ZPHYS(size)); 109 110 if (!kvm_read_all(kd, (unsigned long)zphys_addr, &zphys, 111 sizeof(zphys))) { 112 warnx("can't read znode_phys at %p", zphys_addr); 113 goto bad; 114 } 115 116 /* Get the mount pointer, and read from the address. */ 117 mountptr = getvnodemount(vp); 118 if (!kvm_read_all(kd, (unsigned long)mountptr, &mount, sizeof(mount))) { 119 warnx("can't read mount at %p", (void *)mountptr); 120 goto bad; 121 } 122 vn->vn_fsid = mount.mnt_stat.f_fsid.val[0]; 123 vn->vn_fileid = *zid; 124 /* 125 * XXX: Shows up wrong in output, but UFS has this error too. Could 126 * be that we're casting mode-variables from 64-bit to 8-bit or simply 127 * error in the mode-to-string function. 128 */ 129 vn->vn_mode = (mode_t)zphys.zp_mode; 130 vn->vn_size = (u_long)zphys.zp_size; 131 free(znodeptr); 132 return (0); 133 bad: 134 free(znodeptr); 135 return (1); 136 } 137