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From 36323c9384909d2213fafb77b1fcf0ddbfcaaffc 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 18:18:09 +0000
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Subject: [PATCH 15/35] block/dirty-bitmap: Add bdrv_dirty_iter_next_area
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20181120181828.15132-6-jsnow@redhat.com>
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Patchwork-id: 83054
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O-Subject: [RHEL8/rhel qemu-kvm PATCH 05/24] block/dirty-bitmap: Add bdrv_dirty_iter_next_area
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Bugzilla: 1518989
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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From: Max Reitz <mreitz@redhat.com>
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This new function allows to look for a consecutively dirty area in a
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dirty bitmap.
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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Reviewed-by: Fam Zheng <famz@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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Reviewed-by: John Snow <jsnow@redhat.com>
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Message-id: 20180613181823.13618-10-mreitz@redhat.com
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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(cherry picked from commit 72d10a94213a954ad569095cb4491f2ae0853c40)
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Signed-off-by: John Snow <jsnow@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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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 | 55 ++++++++++++++++++++++++++++++++++++++++++++
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include/block/dirty-bitmap.h | 2 ++
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2 files changed, 57 insertions(+)
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diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
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index 236dce1..c9b8a6f 100644
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--- a/block/dirty-bitmap.c
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+++ b/block/dirty-bitmap.c
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@@ -528,6 +528,61 @@ int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter)
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return hbitmap_iter_next(&iter->hbi, true);
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}
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+/**
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+ * Return the next consecutively dirty area in the dirty bitmap
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+ * belonging to the given iterator @iter.
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+ *
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+ * @max_offset: Maximum value that may be returned for
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+ * *offset + *bytes
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+ * @offset: Will contain the start offset of the next dirty area
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+ * @bytes: Will contain the length of the next dirty area
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+ *
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+ * Returns: True if a dirty area could be found before max_offset
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+ * (which means that *offset and *bytes then contain valid
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+ * values), false otherwise.
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+ *
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+ * Note that @iter is never advanced if false is returned. If an area
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+ * is found (which means that true is returned), it will be advanced
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+ * past that area.
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+ */
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+bool bdrv_dirty_iter_next_area(BdrvDirtyBitmapIter *iter, uint64_t max_offset,
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+ uint64_t *offset, int *bytes)
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+{
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+ uint32_t granularity = bdrv_dirty_bitmap_granularity(iter->bitmap);
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+ uint64_t gran_max_offset;
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+ int64_t ret;
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+ int size;
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+
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+ if (max_offset == iter->bitmap->size) {
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+ /* If max_offset points to the image end, round it up by the
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+ * bitmap granularity */
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+ gran_max_offset = ROUND_UP(max_offset, granularity);
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+ } else {
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+ gran_max_offset = max_offset;
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+ }
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+
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+ ret = hbitmap_iter_next(&iter->hbi, false);
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+ if (ret < 0 || ret + granularity > gran_max_offset) {
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+ return false;
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+ }
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+
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+ *offset = ret;
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+ size = 0;
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+
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+ assert(granularity <= INT_MAX);
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+
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+ do {
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+ /* Advance iterator */
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+ ret = hbitmap_iter_next(&iter->hbi, true);
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+ size += granularity;
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+ } while (ret + granularity <= gran_max_offset &&
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+ hbitmap_iter_next(&iter->hbi, false) == ret + granularity &&
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+ size <= INT_MAX - granularity);
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+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ *bytes = MIN(size, max_offset - *offset);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ return true;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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/* Called within bdrv_dirty_bitmap_lock..unlock */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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int64_t offset, int64_t bytes)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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index bf68dd7..259bd27 100644
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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--- a/include/block/dirty-bitmap.h
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+++ b/include/block/dirty-bitmap.h
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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@@ -83,6 +83,8 @@ void bdrv_set_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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void bdrv_reset_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
int64_t offset, int64_t bytes);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+bool bdrv_dirty_iter_next_area(BdrvDirtyBitmapIter *iter, uint64_t max_offset,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ uint64_t *offset, int *bytes);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
void bdrv_set_dirty_iter(BdrvDirtyBitmapIter *hbi, int64_t offset);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
int64_t bdrv_get_meta_dirty_count(BdrvDirtyBitmap *bitmap);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
--
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
1.8.3.1
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