diff options
| author | Kenneth R Westerback <krw@cvs.openbsd.org> | 2010-05-20 00:04:39 +0000 |
|---|---|---|
| committer | Kenneth R Westerback <krw@cvs.openbsd.org> | 2010-05-20 00:04:39 +0000 |
| commit | 3c3718e53ebd6b33568092f43f11f6f1d0c4130e (patch) | |
| tree | 16aa8e117995376e0e2a6e024d714d880fe5fbf8 /sys/scsi/sd.c | |
| parent | 95952ec49faed304df751391b2d2ee233711e73a (diff) | |
Simplify new disk cache code so simpler people can understand it.
No functional change.
ok dlg@
Diffstat (limited to 'sys/scsi/sd.c')
| -rw-r--r-- | sys/scsi/sd.c | 41 |
1 files changed, 17 insertions, 24 deletions
diff --git a/sys/scsi/sd.c b/sys/scsi/sd.c index 8870ed4ad5b..d2f67671eb1 100644 --- a/sys/scsi/sd.c +++ b/sys/scsi/sd.c @@ -1,4 +1,4 @@ -/* $OpenBSD: sd.c,v 1.189 2010/05/19 05:50:50 dlg Exp $ */ +/* $OpenBSD: sd.c,v 1.190 2010/05/20 00:04:38 krw Exp $ */ /* $NetBSD: sd.c,v 1.111 1997/04/02 02:29:41 mycroft Exp $ */ /*- @@ -1006,7 +1006,7 @@ sd_ioctl_cache(struct sd_softc *sc, long cmd, struct dk_cache *dkc) { union scsi_mode_sense_buf *buf; struct page_caching_mode *mode = NULL; - int set = 0; + u_int wrcache, rdcache; int big; int rv; @@ -1025,35 +1025,28 @@ sd_ioctl_cache(struct sd_softc *sc, long cmd, struct dk_cache *dkc) goto done; } + wrcache = (ISSET(mode->flags, PG_CACHE_FL_WCE) ? 1 : 0); + rdcache = (ISSET(mode->flags, PG_CACHE_FL_RCD) ? 0 : 1); + switch (cmd) { case DIOCGCACHE: - dkc->wrcache = (ISSET(mode->flags, PG_CACHE_FL_WCE) ? 1 : 0); - dkc->rdcache = (ISSET(mode->flags, PG_CACHE_FL_RCD) ? 0 : 1); + dkc->wrcache = wrcache; + dkc->rdcache = rdcache; break; case DIOCSCACHE: - if ((dkc->wrcache ? 1 : 0) != - (ISSET(mode->flags, PG_CACHE_FL_WCE) ? 1 : 0)) { - if (dkc->wrcache) - SET(mode->flags, PG_CACHE_FL_WCE); - else - CLR(mode->flags, PG_CACHE_FL_WCE); - - set = 1; - } - - if ((dkc->rdcache ? 1 : 0) != - (ISSET(mode->flags, PG_CACHE_FL_RCD) ? 0 : 1)) { - if (dkc->rdcache) - CLR(mode->flags, PG_CACHE_FL_RCD); - else - SET(mode->flags, PG_CACHE_FL_RCD); + if (dkc->wrcache == wrcache && dkc->rdcache == rdcache) + break; - set = 1; - } + if (dkc->wrcache) + SET(mode->flags, PG_CACHE_FL_WCE); + else + CLR(mode->flags, PG_CACHE_FL_WCE); - if (!set) - break; + if (dkc->rdcache) + CLR(mode->flags, PG_CACHE_FL_RCD); + else + SET(mode->flags, PG_CACHE_FL_RCD); if (big) { rv = scsi_mode_select_big(sc->sc_link, SMS_PF, |