136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/*-
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* Copyright (c) 2007 Ulf Lilleengen
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#define _KERNEL
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#include <sys/mount.h>
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#include <sys/taskqueue.h>
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#undef _KERNEL
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#include <sys/sysctl.h>
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#undef lbolt
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#undef lbolt64
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#undef gethrestime_sec
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/spa_impl.h>
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#include <sys/dmu.h>
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#include <sys/zap.h>
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#include <sys/fs/zfs.h>
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#include <sys/zfs_znode.h>
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#include <err.h>
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#include <kvm.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define ZFS
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#undef dprintf
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#include <fstat.h>
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/*
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* Offset calculations that are used to get data from znode without having the
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* definition.
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*/
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#define LOCATION_ZID (2 * sizeof(void *))
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#define LOCATION_ZPHYS(zsize) ((zsize) - (2 * sizeof(void *) + sizeof(struct task)))
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int
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zfs_filestat(struct vnode *vp, struct filestat *fsp)
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{
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znode_phys_t zphys;
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struct mount mount, *mountptr;
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uint64_t *zid;
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void *znodeptr, *vnodeptr;
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char *dataptr;
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void *zphys_addr;
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size_t len;
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int size;
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len = sizeof(size);
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if (sysctlbyname("debug.sizeof.znode", &size, &len, NULL, 0) == -1) {
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dprintf(stderr, "error getting sysctl\n");
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return (0);
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}
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znodeptr = malloc(size);
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if (znodeptr == NULL) {
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dprintf(stderr, "error allocating memory for znode storage\n");
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return (0);
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}
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/* Since we have problems including vnode.h, we'll use the wrappers. */
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vnodeptr = getvnodedata(vp);
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if (!KVM_READ(vnodeptr, znodeptr, (size_t)size)) {
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dprintf(stderr, "can't read znode at %p for pid %d\n",
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(void *)vnodeptr, Pid);
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goto bad;
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}
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/*
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* z_id field is stored in the third pointer. We therefore skip the two
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* first bytes.
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*
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* Pointer to the z_phys structure is the next last pointer. Therefore
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* go back two bytes from the end.
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*/
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dataptr = znodeptr;
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zid = (uint64_t *)(dataptr + LOCATION_ZID);
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zphys_addr = *(void **)(dataptr + LOCATION_ZPHYS(size));
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if (!KVM_READ(zphys_addr, &zphys, sizeof(zphys))) {
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dprintf(stderr, "can't read znode_phys at %p for pid %d\n",
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zphys_addr, Pid);
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goto bad;
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}
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/* Get the mount pointer, and read from the address. */
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mountptr = getvnodemount(vp);
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if (!KVM_READ(mountptr, &mount, sizeof(mount))) {
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dprintf(stderr, "can't read mount at %p for pid %d\n",
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(void *)mountptr, Pid);
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goto bad;
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}
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fsp->fsid = (long)mount.mnt_stat.f_fsid.val[0];
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fsp->fileid = *zid;
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/*
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* XXX: Shows up wrong in output, but UFS has this error too. Could
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* be that we're casting mode-variables from 64-bit to 8-bit or simply
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* error in the mode-to-string function.
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*/
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fsp->mode = (mode_t)zphys.zp_mode;
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fsp->size = (u_long)zphys.zp_size;
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fsp->rdev = (dev_t)zphys.zp_rdev;
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free(znodeptr);
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return (1);
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bad:
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free(znodeptr);
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return (0);
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}
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