[src/trunk]: src/sys/dev Add support for implementing discard functionality w...

[jakllsch <jakllsch%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b5c26e98e58f
branches:  trunk
changeset: 810092:b5c26e98e58f
user:      jakllsch <jakllsch%NetBSD.org@localhost>
date:      Mon Aug 17 19:47:21 2015 +0000

description:
Add support for implementing discard functionality with ld(4)

diffstat:

 sys/dev/ld.c    |  38 +++++++++++++++++++++++++++++++++-----
 sys/dev/ldvar.h |   3 ++-
 2 files changed, 35 insertions(+), 6 deletions(-)

diffs (108 lines):

diff -r 1421d4488aed -r b5c26e98e58f sys/dev/ld.c
--- a/sys/dev/ld.c      Mon Aug 17 18:43:37 2015 +0000
+++ b/sys/dev/ld.c      Mon Aug 17 19:47:21 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ld.c,v 1.89 2015/08/16 18:00:03 mlelstv Exp $  */
+/*     $NetBSD: ld.c,v 1.90 2015/08/17 19:47:21 jakllsch Exp $ */
 
 /*-
  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ld.c,v 1.89 2015/08/16 18:00:03 mlelstv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ld.c,v 1.90 2015/08/17 19:47:21 jakllsch Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -70,6 +70,7 @@
 static void    ld_set_geometry(struct ld_softc *);
 static void    ld_config_interrupts (device_t);
 static int     ld_lastclose(device_t);
+static int     ld_discard(device_t, off_t, off_t);
 
 extern struct  cfdriver ld_cd;
 
@@ -81,6 +82,7 @@
 static dev_type_strategy(ldstrategy);
 static dev_type_dump(lddump);
 static dev_type_size(ldsize);
+static dev_type_discard(lddiscard);
 
 const struct bdevsw ld_bdevsw = {
        .d_open = ldopen,
@@ -89,7 +91,7 @@
        .d_ioctl = ldioctl,
        .d_dump = lddump,
        .d_psize = ldsize,
-       .d_discard = nodiscard,
+       .d_discard = lddiscard,
        .d_flag = D_DISK | D_MPSAFE
 };
 
@@ -104,7 +106,7 @@
        .d_poll = nopoll,
        .d_mmap = nommap,
        .d_kqfilter = nokqfilter,
-       .d_discard = nodiscard,
+       .d_discard = lddiscard,
        .d_flag = D_DISK | D_MPSAFE
 };
 
@@ -116,7 +118,8 @@
        .d_minphys  = ldminphys,
        .d_diskstart = ld_diskstart,
        .d_dumpblocks = ld_dumpblocks,
-       .d_lastclose = ld_lastclose
+       .d_lastclose = ld_lastclose,
+       .d_discard = ld_discard
 };
 
 void
@@ -578,3 +581,28 @@
 
        dkwedge_discover(&dksc->sc_dkdev);
 }
+
+static int
+ld_discard(device_t dev, off_t pos, off_t len)
+{
+       struct ld_softc *sc = device_private(dev);
+
+       if (sc->sc_discard == NULL)
+               return (ENXIO);
+
+       return (*sc->sc_discard)(sc, pos, len);
+}
+
+static int
+lddiscard(dev_t dev, off_t pos, off_t len)
+{
+       struct ld_softc *sc;
+       struct dk_softc *dksc;
+       int unit;
+
+       unit = DISKUNIT(dev);
+       sc = device_lookup_private(&ld_cd, unit);
+       dksc = &sc->sc_dksc;
+
+       return dk_discard(dksc, dev, pos, len);
+}
diff -r 1421d4488aed -r b5c26e98e58f sys/dev/ldvar.h
--- a/sys/dev/ldvar.h   Mon Aug 17 18:43:37 2015 +0000
+++ b/sys/dev/ldvar.h   Mon Aug 17 19:47:21 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ldvar.h,v 1.25 2015/08/16 14:02:52 mlelstv Exp $       */
+/*     $NetBSD: ldvar.h,v 1.26 2015/08/17 19:47:21 jakllsch Exp $      */
 
 /*-
  * Copyright (c) 2000 The NetBSD Foundation, Inc.
@@ -62,6 +62,7 @@
        int             (*sc_dump)(struct ld_softc *, void *, int, int);
        int             (*sc_flush)(struct ld_softc *, int);
        int             (*sc_start)(struct ld_softc *, struct buf *);
+       int             (*sc_discard)(struct ld_softc *, off_t, off_t);
 };
 
 /* sc_flags */