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From e743acc0093fdb790509f64014ad8858ecfe0839 Mon Sep 17 00:00:00 2001
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Message-Id: <e743acc0093fdb790509f64014ad8858ecfe0839@dist-git>
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From: Martin Kletzander <mkletzan@redhat.com>
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Date: Wed, 31 Jan 2018 16:32:16 +0100
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Subject: [PATCH] util: Introduce virBitmapShrink
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https://bugzilla.redhat.com/show_bug.cgi?id=1289368
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Sometimes the size of the bitmap matters and it might not be guessed correctly
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when parsing from some type of input. For example virBitmapNewData() has Byte
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granularity, virBitmapNewString() has nibble granularity and so on.
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virBitmapParseUnlimited() can be tricked into creating huge bitmap that's not
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needed (e.g.: "0-2,^99999999"). This function provides a way to shrink the
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bitmap. It is not supposed to free any memory.
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Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
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Reviewed-by: John Ferlan <jferlan@redhat.com>
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(cherry picked from commit baca005367cf60743f67df44440fc316e6d20c19)
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Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
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---
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src/libvirt_private.syms | 1 +
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src/util/virbitmap.c | 23 +++++++++++++++++++++++
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src/util/virbitmap.h | 2 ++
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3 files changed, 26 insertions(+)
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diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
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index 8cc8cbcc90..7dd4621b70 100644
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--- a/src/libvirt_private.syms
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+++ b/src/libvirt_private.syms
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@@ -1382,6 +1382,7 @@ virBitmapParseUnlimited;
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virBitmapSetAll;
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virBitmapSetBit;
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virBitmapSetBitExpand;
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+virBitmapShrink;
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virBitmapSize;
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virBitmapSubtract;
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virBitmapToData;
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diff --git a/src/util/virbitmap.c b/src/util/virbitmap.c
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index 7338f0255a..b2c5c7a6a5 100644
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--- a/src/util/virbitmap.c
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+++ b/src/util/virbitmap.c
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@@ -1196,3 +1196,26 @@ virBitmapSubtract(virBitmapPtr a,
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for (i = 0; i < max; i++)
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a->map[i] &= ~b->map[i];
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}
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+
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+
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+/**
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+ * virBitmapShrink:
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+ * @map: Pointer to bitmap
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+ * @b: last bit position to be excluded from bitmap
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+ *
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+ * Resizes the bitmap so that no more than @b bits will fit into it. Nothing
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+ * will change if the size is already smaller than @b.
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+ *
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+ * NB: Does not adjust the map->map_len so that a subsequent virBitmapExpand
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+ * doesn't necessarily need to reallocate.
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+ */
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+void
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+virBitmapShrink(virBitmapPtr map,
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+ size_t b)
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+{
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+ if (!map)
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+ return;
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+
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+ if (map->max_bit >= b)
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+ map->max_bit = b;
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+}
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diff --git a/src/util/virbitmap.h b/src/util/virbitmap.h
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index 7b2bea8b53..2464814055 100644
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--- a/src/util/virbitmap.h
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+++ b/src/util/virbitmap.h
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@@ -153,4 +153,6 @@ void virBitmapIntersect(virBitmapPtr a, virBitmapPtr b)
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void virBitmapSubtract(virBitmapPtr a, virBitmapPtr b)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
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+void virBitmapShrink(virBitmapPtr map, size_t b);
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+
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#endif
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--
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2.16.1
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