1 /*- 2 * Copyright (c) 2007 Ulf Lilleengen 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #define _KERNEL 31 #include <sys/mount.h> 32 #include <sys/taskqueue.h> 33 #undef _KERNEL 34 #include <sys/sysctl.h> 35 36 #undef lbolt 37 #undef lbolt64 38 #undef gethrestime_sec 39 #include <sys/zfs_context.h> 40 #include <sys/spa.h> 41 #include <sys/spa_impl.h> 42 #include <sys/dmu.h> 43 #include <sys/zap.h> 44 #include <sys/fs/zfs.h> 45 #include <sys/zfs_znode.h> 46 #include <sys/zfs_sa.h> 47 48 #include <netinet/in.h> 49 50 #include <err.h> 51 #include <kvm.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 55 #define ZFS 56 #include "libprocstat.h" 57 #include "common_kvm.h" 58 59 /* 60 * Offset calculations that are used to get data from znode without having the 61 * definition. 62 */ 63 #define LOCATION_ZID (2 * sizeof(void *)) 64 #define LOCATION_ZPHYS(zsize) ((zsize) - (2 * sizeof(void *) + sizeof(struct task))) 65 66 int 67 zfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn) 68 { 69 70 znode_phys_t zphys; 71 struct mount mount, *mountptr; 72 uint64_t *zid; 73 void *znodeptr, *vnodeptr; 74 char *dataptr; 75 void *zphys_addr; 76 size_t len; 77 int size; 78 79 len = sizeof(size); 80 if (sysctlbyname("debug.sizeof.znode", &size, &len, NULL, 0) == -1) { 81 warnx("error getting sysctl"); 82 return (1); 83 } 84 znodeptr = malloc(size); 85 if (znodeptr == NULL) { 86 warnx("error allocating memory for znode storage"); 87 return (1); 88 } 89 /* Since we have problems including vnode.h, we'll use the wrappers. */ 90 vnodeptr = getvnodedata(vp); 91 if (!kvm_read_all(kd, (unsigned long)vnodeptr, znodeptr, 92 (size_t)size)) { 93 warnx("can't read znode at %p", (void *)vnodeptr); 94 goto bad; 95 } 96 97 /* 98 * z_id field is stored in the third pointer. We therefore skip the two 99 * first bytes. 100 * 101 * Pointer to the z_phys structure is the next last pointer. Therefore 102 * go back two bytes from the end. 103 */ 104 dataptr = znodeptr; 105 zid = (uint64_t *)(dataptr + LOCATION_ZID); 106 zphys_addr = *(void **)(dataptr + LOCATION_ZPHYS(size)); 107 108 if (!kvm_read_all(kd, (unsigned long)zphys_addr, &zphys, 109 sizeof(zphys))) { 110 warnx("can't read znode_phys at %p", zphys_addr); 111 goto bad; 112 } 113 114 /* Get the mount pointer, and read from the address. */ 115 mountptr = getvnodemount(vp); 116 if (!kvm_read_all(kd, (unsigned long)mountptr, &mount, sizeof(mount))) { 117 warnx("can't read mount at %p", (void *)mountptr); 118 goto bad; 119 } 120 vn->vn_fsid = mount.mnt_stat.f_fsid.val[0]; 121 vn->vn_fileid = *zid; 122 /* 123 * XXX: Shows up wrong in output, but UFS has this error too. Could 124 * be that we're casting mode-variables from 64-bit to 8-bit or simply 125 * error in the mode-to-string function. 126 */ 127 vn->vn_mode = (mode_t)zphys.zp_mode; 128 vn->vn_size = (u_long)zphys.zp_size; 129 free(znodeptr); 130 return (0); 131 bad: 132 free(znodeptr); 133 return (1); 134 } 135