[src/trunk]: src/sys allow to enable ffs "discard" by update mounts, make the...

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

details:   https://anonhg.NetBSD.org/src/rev/2107ad1d0911
branches:  trunk
changeset: 782912:2107ad1d0911
user:      drochner <drochner%NetBSD.org@localhost>
date:      Mon Nov 26 16:22:21 2012 +0000

description:
allow to enable ffs "discard" by update mounts, make the flag visible
to userland

diffstat:

 sys/sys/fstypes.h        |  3 ++-
 sys/ufs/ffs/ffs_vfsops.c |  8 ++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diffs (46 lines):

diff -r c7b932380712 -r 2107ad1d0911 sys/sys/fstypes.h
--- a/sys/sys/fstypes.h Mon Nov 26 08:05:47 2012 +0000
+++ b/sys/sys/fstypes.h Mon Nov 26 16:22:21 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: fstypes.h,v 1.31 2012/10/19 17:09:07 drochner Exp $    */
+/*     $NetBSD: fstypes.h,v 1.32 2012/11/26 16:22:21 drochner Exp $    */
 
 /*
  * Copyright (c) 1989, 1991, 1993
@@ -171,6 +171,7 @@
      MNT_ASYNC | \
      MNT_NOCOREDUMP | \
      MNT_IGNORE | \
+     MNT_DISCARD | \
      MNT_NOATIME | \
      MNT_SYMPERM | \
      MNT_NODEVMTIME | \
diff -r c7b932380712 -r 2107ad1d0911 sys/ufs/ffs/ffs_vfsops.c
--- a/sys/ufs/ffs/ffs_vfsops.c  Mon Nov 26 08:05:47 2012 +0000
+++ b/sys/ufs/ffs/ffs_vfsops.c  Mon Nov 26 16:22:21 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ffs_vfsops.c,v 1.279 2012/10/19 17:09:08 drochner Exp $        */
+/*     $NetBSD: ffs_vfsops.c,v 1.280 2012/11/26 16:22:21 drochner Exp $        */
 
 /*-
  * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -61,7 +61,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ffs_vfsops.c,v 1.279 2012/10/19 17:09:08 drochner Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ffs_vfsops.c,v 1.280 2012/11/26 16:22:21 drochner Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_ffs.h"
@@ -580,6 +580,10 @@
                        }
                }
 #endif
+
+               if ((mp->mnt_flag & MNT_DISCARD) && !(ump->um_discarddata))
+                       ump->um_discarddata = ffs_discard_init(devvp, fs);
+
                if (args->fspec == NULL)
                        return 0;
        }