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Blame SOURCES/kvm-block-simplify-code-around-releasing-bitmaps.patch

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From 9d75983943f6510a804b2b9c48efa1eb3dcb41a2 Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Tue, 20 Nov 2018 18:18:06 +0000
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Subject: [PATCH 12/35] block: simplify code around releasing bitmaps
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20181120181828.15132-3-jsnow@redhat.com>
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Patchwork-id: 83053
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O-Subject: [RHEL8/rhel qemu-kvm PATCH 02/24] block: simplify code around releasing bitmaps
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Bugzilla: 1518989
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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QLIST_REMOVE does not require walking the list, and once the "bitmap"
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argument is removed from bdrv_do_release_matching_dirty_bitmap_locked
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the code simplifies a lot and it is worth inlining everything in the
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callers of bdrv_do_release_matching_dirty_bitmap.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Reviewed-by: John Snow <jsnow@redhat.com>
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Message-id: 20180326104037.6894-1-pbonzini@redhat.com
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Signed-off-by: John Snow <jsnow@redhat.com>
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(cherry picked from commit b133c27f5dc59969574b0715e5837d32c99caa86)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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 block/dirty-bitmap.c | 84 ++++++++++++++++++++--------------------------------
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 1 file changed, 32 insertions(+), 52 deletions(-)
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diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
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index 634f143..dac8d74 100644
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--- a/block/dirty-bitmap.c
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+++ b/block/dirty-bitmap.c
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@@ -256,49 +256,16 @@ void bdrv_dirty_bitmap_enable_successor(BdrvDirtyBitmap *bitmap)
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     qemu_mutex_unlock(bitmap->mutex);
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 }
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-/* Called within bdrv_dirty_bitmap_lock..unlock */
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-static void bdrv_do_release_matching_dirty_bitmap_locked(
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-    BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
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-    bool (*cond)(BdrvDirtyBitmap *bitmap))
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+/* Called within bdrv_dirty_bitmap_lock..unlock and with BQL taken.  */
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+static void bdrv_release_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap)
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 {
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-    BdrvDirtyBitmap *bm, *next;
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-
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-    QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
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-        if ((!bitmap || bm == bitmap) && (!cond || cond(bm))) {
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-            assert(!bm->active_iterators);
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-            assert(!bdrv_dirty_bitmap_frozen(bm));
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-            assert(!bm->meta);
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-            QLIST_REMOVE(bm, list);
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-            hbitmap_free(bm->bitmap);
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-            g_free(bm->name);
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-            g_free(bm);
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-
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-            if (bitmap) {
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-                return;
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-            }
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-        }
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-    }
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-
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-    if (bitmap) {
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-        abort();
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-    }
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-}
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-
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-/* Called with BQL taken.  */
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-static void bdrv_do_release_matching_dirty_bitmap(
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-    BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
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-    bool (*cond)(BdrvDirtyBitmap *bitmap))
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-{
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-    bdrv_dirty_bitmaps_lock(bs);
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-    bdrv_do_release_matching_dirty_bitmap_locked(bs, bitmap, cond);
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-    bdrv_dirty_bitmaps_unlock(bs);
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-}
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-
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-/* Called within bdrv_dirty_bitmap_lock..unlock */
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-static void bdrv_release_dirty_bitmap_locked(BlockDriverState *bs,
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-                                             BdrvDirtyBitmap *bitmap)
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-{
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-    bdrv_do_release_matching_dirty_bitmap_locked(bs, bitmap, NULL);
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+    assert(!bitmap->active_iterators);
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+    assert(!bdrv_dirty_bitmap_frozen(bitmap));
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+    assert(!bitmap->meta);
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+    QLIST_REMOVE(bitmap, list);
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+    hbitmap_free(bitmap->bitmap);
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+    g_free(bitmap->name);
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+    g_free(bitmap);
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 }
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 /**
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@@ -351,7 +318,7 @@ BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap_locked(BlockDriverState *bs,
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         error_setg(errp, "Merging of parent and successor bitmap failed");
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         return NULL;
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     }
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-    bdrv_release_dirty_bitmap_locked(bs, successor);
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+    bdrv_release_dirty_bitmap_locked(successor);
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     parent->successor = NULL;
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     return parent;
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@@ -389,15 +356,12 @@ void bdrv_dirty_bitmap_truncate(BlockDriverState *bs, int64_t bytes)
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     bdrv_dirty_bitmaps_unlock(bs);
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 }
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-static bool bdrv_dirty_bitmap_has_name(BdrvDirtyBitmap *bitmap)
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-{
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-    return !!bdrv_dirty_bitmap_name(bitmap);
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-}
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-
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 /* Called with BQL taken.  */
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 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
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 {
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-    bdrv_do_release_matching_dirty_bitmap(bs, bitmap, NULL);
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+    bdrv_dirty_bitmaps_lock(bs);
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+    bdrv_release_dirty_bitmap_locked(bitmap);
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+    bdrv_dirty_bitmaps_unlock(bs);
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 }
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 /**
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@@ -408,7 +372,15 @@ void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
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  */
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 void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs)
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 {
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-    bdrv_do_release_matching_dirty_bitmap(bs, NULL, bdrv_dirty_bitmap_has_name);
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+    BdrvDirtyBitmap *bm, *next;
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+
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+    bdrv_dirty_bitmaps_lock(bs);
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+    QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
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+        if (bdrv_dirty_bitmap_name(bm)) {
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+            bdrv_release_dirty_bitmap_locked(bm);
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+        }
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+    }
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+    bdrv_dirty_bitmaps_unlock(bs);
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 }
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 /**
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@@ -416,11 +388,19 @@ void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs)
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  * bdrv_inactivate_recurse()).
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  * There must not be any frozen bitmaps attached.
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  * This function does not remove persistent bitmaps from the storage.
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+ * Called with BQL taken.
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  */
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 void bdrv_release_persistent_dirty_bitmaps(BlockDriverState *bs)
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 {
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-    bdrv_do_release_matching_dirty_bitmap(bs, NULL,
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-                                          bdrv_dirty_bitmap_get_persistance);
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+    BdrvDirtyBitmap *bm, *next;
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+
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+    bdrv_dirty_bitmaps_lock(bs);
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+    QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) {
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+        if (bdrv_dirty_bitmap_get_persistance(bm)) {
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+            bdrv_release_dirty_bitmap_locked(bm);
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+        }
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+    }
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+    bdrv_dirty_bitmaps_unlock(bs);
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 }
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 /**
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-- 
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1.8.3.1
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