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From: John Birrell <jb@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Cc: 
Subject: PERFORCE change 145532 for review
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http://perforce.freebsd.org/chv.cgi?CH=145532

Change 145532 by jb@freebsd3 on 2008/07/21 04:52:32

	Add a couple of probes for convenient stat() access when the call
	returns no error. One fires for all modes, if enabled. The other is
	more restrictive and only fires for regular files, if enabled.

Affected files ...

.. //depot/projects/dtrace/src/sys/kern/vfs_syscalls.c#25 edit

Differences ...

==== //depot/projects/dtrace/src/sys/kern/vfs_syscalls.c#25 (text+ko) ====

@@ -38,6 +38,7 @@
 __FBSDID("$FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.454 2008/06/22 21:51:32 rwatson Exp $");
 
 #include "opt_compat.h"
+#include "opt_kdtrace.h"
 #include "opt_ktrace.h"
 #include "opt_mac.h"
 
@@ -58,6 +59,7 @@
 #include <sys/filio.h>
 #include <sys/limits.h>
 #include <sys/linker.h>
+#include <sys/sdt.h>
 #include <sys/stat.h>
 #include <sys/sx.h>
 #include <sys/unistd.h>
@@ -82,6 +84,13 @@
 #include <vm/vm_page.h>
 #include <vm/uma.h>
 
+SDT_PROVIDER_DEFINE(vfs);
+SDT_PROBE_DEFINE(vfs, , stat, mode);
+SDT_PROBE_ARGTYPE(vfs, , stat, mode, 0, "char *");
+SDT_PROBE_ARGTYPE(vfs, , stat, mode, 1, "int");
+SDT_PROBE_DEFINE(vfs, , stat, reg);
+SDT_PROBE_ARGTYPE(vfs, , stat, reg, 0, "char *");
+
 static int chroot_refuse_vdir_fds(struct filedesc *fdp);
 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *);
 static int setfown(struct thread *td, struct vnode *, uid_t, gid_t);
@@ -2344,6 +2353,10 @@
 	if (KTRPOINT(td, KTR_STRUCT))
 		ktrstat(&sb);
 #endif
+	SDT_PROBE(vfs, , stat, mode, path, sb.st_mode, 0, 0, 0);
+	if (S_ISREG(sb.st_mode)) {
+		SDT_PROBE(vfs, , stat, reg, path, 0, 0, 0, 0);
+	}
 	return (0);
 }