1 files changed, 134 insertions, 0 deletions
diff --git a/lib/libprocstat/zfs.c b/lib/libprocstat/zfs.c
new file mode 100644
index 0000000..aa6d78e
--- /dev/null
+++ b/lib/libprocstat/zfs.c
@@ -0,0 +1,134 @@
+/*-
+ * Copyright (c) 2007 Ulf Lilleengen
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#define _KERNEL
+#include <sys/mount.h>
+#include <sys/taskqueue.h>
+#undef _KERNEL
+#include <sys/sysctl.h>
+
+#undef lbolt
+#undef lbolt64
+#undef gethrestime_sec
+#include <sys/zfs_context.h>
+#include <sys/spa.h>
+#include <sys/spa_impl.h>
+#include <sys/dmu.h>
+#include <sys/zap.h>
+#include <sys/fs/zfs.h>
+#include <sys/zfs_znode.h>
+#include <sys/zfs_sa.h>
+
+#include <netinet/in.h>
+
+#include <err.h>
+#include <kvm.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define ZFS
+#include "libprocstat.h"
+#include "common_kvm.h"
+
+/* 
+ * Offset calculations that are used to get data from znode without having the
+ * definition.
+ */
+#define LOCATION_ZID (2 * sizeof(void *))
+#define LOCATION_ZPHYS(zsize) ((zsize) - (2 * sizeof(void *) + sizeof(struct task)))
+
+int
+zfs_filestat(kvm_t *kd, struct vnode *vp, struct vnstat *vn)
+{
+
+	znode_phys_t zphys;
+	struct mount mount, *mountptr;
+	uint64_t *zid;
+	void *znodeptr, *vnodeptr;
+	char *dataptr;
+	void *zphys_addr;
+	size_t len;
+	int size;
+
+	len = sizeof(size);
+	if (sysctlbyname("debug.sizeof.znode", &size, &len, NULL, 0) == -1) {
+		warnx("error getting sysctl");
+		return (1);
+	}
+	znodeptr = malloc(size);
+	if (znodeptr == NULL) {
+		warnx("error allocating memory for znode storage");
+		return (1);
+	}
+	/* Since we have problems including vnode.h, we'll use the wrappers. */
+	vnodeptr = getvnodedata(vp);
+	if (!kvm_read_all(kd, (unsigned long)vnodeptr, znodeptr,
+	    (size_t)size)) {
+		warnx("can't read znode at %p", (void *)vnodeptr);
+		goto bad;
+	}
+
+	/* 
+	 * z_id field is stored in the third pointer. We therefore skip the two
+	 * first bytes. 
+	 *
+	 * Pointer to the z_phys structure is the next last pointer. Therefore
+	 * go back two bytes from the end.
+	 */
+	dataptr = znodeptr;
+	zid = (uint64_t *)(dataptr + LOCATION_ZID);
+	zphys_addr = *(void **)(dataptr + LOCATION_ZPHYS(size));
+
+	if (!kvm_read_all(kd, (unsigned long)zphys_addr, &zphys,
+	    sizeof(zphys))) {
+		warnx("can't read znode_phys at %p", zphys_addr);
+		goto bad;
+	}
+
+	/* Get the mount pointer, and read from the address. */
+	mountptr = getvnodemount(vp);
+	if (!kvm_read_all(kd, (unsigned long)mountptr, &mount, sizeof(mount))) {
+		warnx("can't read mount at %p", (void *)mountptr);
+		goto bad;
+	}
+	vn->vn_fsid = mount.mnt_stat.f_fsid.val[0];
+	vn->vn_fileid = *zid;
+	/*
+	 * XXX: Shows up wrong in output, but UFS has this error too. Could
+	 * be that we're casting mode-variables from 64-bit to 8-bit or simply
+	 * error in the mode-to-string function.
+	 */
+	vn->vn_mode = (mode_t)zphys.zp_mode;
+	vn->vn_size = (u_long)zphys.zp_size;
+	free(znodeptr);
+	return (0);
+bad:
+	free(znodeptr);
+	return (1);
+}