Date: Thu, 16 Sep 2010 23:29:38 -0300 From: "Carlos A. M. dos Santos" <unixmania@gmail.com> To: Brian Somers <brian@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Kirk McKusick <mckusick@freebsd.org> Subject: Re: svn commit: r212617 - head/sys/ufs/ffs Message-ID: <AANLkTikU6L8sjWi6cSWzK2wJqj7VAm5DSZ-YhQcZ49mP@mail.gmail.com> In-Reply-To: <20100916014404.0409017f@dev.lan.Awfulhak.org> References: <201009141804.o8EI45kp088466@svn.freebsd.org> <20100916014404.0409017f@dev.lan.Awfulhak.org>
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On Thu, Sep 16, 2010 at 5:44 AM, Brian Somers <brian@freebsd.org> wrote: > On Tue, 14 Sep 2010 18:04:05 +0000 (UTC) Kirk McKusick <mckusick@FreeBSD.= org> wrote: >> Author: mckusick >> Date: Tue Sep 14 18:04:05 2010 >> New Revision: 212617 >> URL: http://svn.freebsd.org/changeset/base/212617 >> >> Log: >> =A0 Update comments in soft updates code to more fully describe >> =A0 the addition of journalling. Only functional change is to >> =A0 tighten a KASSERT. >> >> =A0 Reviewed by: =A0 =A0 =A0 =A0jeff Roberson >> >> Modified: >> =A0 head/sys/ufs/ffs/ffs_softdep.c >> =A0 head/sys/ufs/ffs/fs.h >> =A0 head/sys/ufs/ffs/softdep.h >> >> Modified: head/sys/ufs/ffs/ffs_softdep.c >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D >> --- head/sys/ufs/ffs/ffs_softdep.c =A0 =A0Tue Sep 14 17:22:06 2010 =A0 = =A0 =A0 =A0(r212616) >> +++ head/sys/ufs/ffs/ffs_softdep.c =A0 =A0Tue Sep 14 18:04:05 2010 =A0 = =A0 =A0 =A0(r212617) >> @@ -2378,7 +2378,8 @@ remove_from_journal(wk) >> =A0 =A0 =A0 /* >> =A0 =A0 =A0 =A0* We emulate a TAILQ to save space in most structures whi= ch do not >> =A0 =A0 =A0 =A0* require TAILQ semantics. =A0Here we must update the tai= l position >> - =A0 =A0 =A0* when removing the tail which is not the final entry. >> + =A0 =A0 =A0* when removing the tail which is not the final entry. This= works >> + =A0 =A0 =A0* only if the worklist linkage are at the beginning of the = structure. >> =A0 =A0 =A0 =A0*/ >> =A0 =A0 =A0 if (ump->softdep_journal_tail =3D=3D wk) >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 ump->softdep_journal_tail =3D >> @@ -2605,7 +2606,7 @@ jremref_write(jremref, jseg, data) >> =A0 =A0 =A0 inoref_write(&jremref->jr_ref, jseg, rec); >> =A0} >> >> -static =A0 =A0 =A0 void >> +static void >> =A0jmvref_write(jmvref, jseg, data) >> =A0 =A0 =A0 struct jmvref *jmvref; >> =A0 =A0 =A0 struct jseg *jseg; >> @@ -2906,9 +2907,9 @@ complete_jseg(jseg) >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 waiting =3D wk->wk_state & IOWAITING; >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 wk->wk_state &=3D ~(IOSTARTED | IOWAITING); >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 wk->wk_state |=3D COMPLETE; >> - =A0 =A0 =A0 =A0 =A0 =A0 KASSERT(i < jseg->js_cnt, >> + =A0 =A0 =A0 =A0 =A0 =A0 KASSERT(i++ < jseg->js_cnt, >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ("handle_written_jseg: overflow %d >= =3D %d", > [.....] > > If INVARIANTS is not defined, the above i++ will not happen. Which does not cause any harm, since "i" is a local variable, not used anywhere else in the function. A picky compiler would complain, however, that the variable is never read.
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