Date: Mon, 6 Apr 2009 10:32:40 +0000 (UTC) From: Robert Watson <rwatson@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r190759 - head/sys/kern Message-ID: <200904061032.n36AWeEr064064@svn.freebsd.org>
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Author: rwatson Date: Mon Apr 6 10:32:40 2009 New Revision: 190759 URL: http://svn.freebsd.org/changeset/base/190759 Log: Add SDT DTrace probes for namei(): vfs:namei:lookup:entry takes parent directory vnode pointer, path to look up, and lookup flags. vfs:namei:lookup:return takes an error value, and if successful, the returned vnode pointer. MFC after: 1 month Modified: head/sys/kern/vfs_lookup.c Modified: head/sys/kern/vfs_lookup.c ============================================================================== --- head/sys/kern/vfs_lookup.c Mon Apr 6 10:09:20 2009 (r190758) +++ head/sys/kern/vfs_lookup.c Mon Apr 6 10:32:40 2009 (r190759) @@ -37,6 +37,7 @@ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); +#include "opt_kdtrace.h" #include "opt_ktrace.h" #include "opt_mac.h" @@ -51,6 +52,7 @@ __FBSDID("$FreeBSD$"); #include <sys/mount.h> #include <sys/filedesc.h> #include <sys/proc.h> +#include <sys/sdt.h> #include <sys/syscallsubr.h> #include <sys/sysctl.h> #ifdef KTRACE @@ -65,6 +67,11 @@ __FBSDID("$FreeBSD$"); #define NAMEI_DIAGNOSTIC 1 #undef NAMEI_DIAGNOSTIC +SDT_PROVIDER_DECLARE(vfs); +SDT_PROBE_DEFINE3(vfs, namei, lookup, entry, "struct vnode *", "char *", + "unsigned long"); +SDT_PROBE_DEFINE2(vfs, namei, lookup, return, "int", "struct vnode *"); + /* * Allocation zone for namei */ @@ -181,7 +188,6 @@ namei(struct nameidata *ndp) ktrnamei(cnp->cn_pnbuf); } #endif - /* * Get starting point for the translation. */ @@ -224,6 +230,8 @@ namei(struct nameidata *ndp) VFS_UNLOCK_GIANT(vfslocked); } } + SDT_PROBE(vfs, namei, lookup, entry, dp, cnp->cn_pnbuf, + cnp->cn_flags, 0, 0); vfslocked = VFS_LOCK_GIANT(dp->v_mount); for (;;) { /* @@ -252,6 +260,8 @@ namei(struct nameidata *ndp) cnp->cn_pnbuf = NULL; cnp->cn_nameptr = NULL; #endif + SDT_PROBE(vfs, namei, lookup, return, error, NULL, 0, + 0, 0); return (error); } vfslocked = (ndp->ni_cnd.cn_flags & GIANTHELD) != 0; @@ -273,6 +283,8 @@ namei(struct nameidata *ndp) VFS_UNLOCK_GIANT(vfslocked); } else if (vfslocked) ndp->ni_cnd.cn_flags |= GIANTHELD; + SDT_PROBE(vfs, namei, lookup, return, 0, ndp->ni_vp, + 0, 0, 0); return (0); } if (ndp->ni_loopcnt++ >= MAXSYMLINKS) { @@ -338,6 +350,7 @@ namei(struct nameidata *ndp) ndp->ni_vp = NULL; vrele(ndp->ni_dvp); VFS_UNLOCK_GIANT(vfslocked); + SDT_PROBE(vfs, namei, lookup, return, error, NULL, 0, 0, 0); return (error); }
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