D14898.id40889.diff
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D14898.id40889.diff
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	Index: sys/kern/vfs_cache.c
	===================================================================
	--- sys/kern/vfs_cache.c
	+++ sys/kern/vfs_cache.c
	@@ -37,6 +37,7 @@
	#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");

	+#include "opt_ddb.h"
	#include "opt_ktrace.h"

	#include <sys/param.h>
	@@ -62,6 +63,10 @@
	#include <sys/ktrace.h>
	#endif

	+#ifdef DDB
	+#include <ddb/ddb.h>
	+#endif
	+
	#include <vm/uma.h>

	SDT_PROVIDER_DECLARE(vfs);
	@@ -2527,3 +2532,68 @@
	free(fbuf, M_TEMP);
	return (error);
	}
	+
	+#ifdef DDB
	+static void
	+db_print_nc_name(struct namecache *ncp)
	+{
	+ char *ncn;
	+ int i;
	+
	+ if (ncp->nc_flag & NCF_TS) {
	+ struct namecache_ts *ncp_ts;
	+
	+ ncp_ts = __containerof(ncp, struct namecache_ts, nc_nc);
	+ ncp = &ncp_ts->nc_nc;
	+ }
	+ ncn = ncp->nc_name;
	+
	+ for (i = 0; i < ncp->nc_nlen; i++)
	+ printf("%c", *ncn++);
	+}
	+
	+static void
	+db_print_vpath(struct vnode *vp)
	+{
	+
	+ while (vp != NULL) {
	+ db_printf("%p: ", vp);
	+ if (vp == rootvnode) {
	+ db_printf("/");
	+ vp = NULL;
	+ } else {
	+ if (vp->v_vflag & VV_ROOT) {
	+ db_printf("<mount point>");
	+ vp = vp->v_mount->mnt_vnodecovered;
	+ } else {
	+ struct namecache *ncp;
	+
	+ ncp = TAILQ_FIRST(&vp->v_cache_dst);
	+ if (ncp != NULL) {
	+ db_print_nc_name(ncp);
	+ vp = ncp->nc_dvp;
	+ } else {
	+ vp = NULL;
	+ }
	+ }
	+ }
	+ db_printf("\n");
	+ }
	+
	+ return;
	+}
	+
	+DB_SHOW_COMMAND(vpath, db_show_vpath)
	+{
	+ struct vnode *vp;
	+
	+ if (!have_addr) {
	+ db_printf("usage: show vpath <strcut vnode *>\n");
	+ return;
	+ }
	+
	+ vp = (struct vnode *)addr;
	+ db_print_vpath(vp);
	+}
	+
	+#endif