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[PATCH v2 03/20] parallels: Add mark_unused() helper
From: |
Alexander Ivanov |
Subject: |
[PATCH v2 03/20] parallels: Add mark_unused() helper |
Date: |
Thu, 19 Oct 2023 14:58:37 +0200 |
Add a helper to set unused areas in used bitmap.
Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
---
block/parallels.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/block/parallels.c b/block/parallels.c
index 7eb92f87ab..6a4e3945c6 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -195,6 +195,23 @@ static int mark_used(BlockDriverState *bs, unsigned long
*bitmap,
return 0;
}
+static int mark_unused(BlockDriverState *bs, unsigned long *bitmap,
+ uint32_t bitmap_size, int64_t off, uint32_t count)
+{
+ BDRVParallelsState *s = bs->opaque;
+ uint32_t cluster_index = host_cluster_index(s, off);
+ unsigned long next_unused;
+ if (cluster_index + count > bitmap_size) {
+ return -E2BIG;
+ }
+ next_unused = find_next_zero_bit(bitmap, bitmap_size, cluster_index);
+ if (next_unused < cluster_index + count) {
+ return -EINVAL;
+ }
+ bitmap_clear(bitmap, cluster_index, count);
+ return 0;
+}
+
/*
* Collect used bitmap. The image can contain errors, we should fill the
* bitmap anyway, as much as we can. This information will be used for
--
2.34.1
- [PATCH v2 00/20] parallels: Add full dirty bitmap support, Alexander Ivanov, 2023/10/19
- [PATCH v2 02/20] parallels: Move inactivation code to a separate function, Alexander Ivanov, 2023/10/19
- [PATCH v2 01/20] parallels: Set s->used_bmap to NULL in parallels_free_used_bitmap(), Alexander Ivanov, 2023/10/19
- [PATCH v2 04/20] parallels: Move host clusters allocation to a separate function, Alexander Ivanov, 2023/10/19
- [PATCH v2 06/20] parallels: Recreate used bitmap in parallels_check_leak(), Alexander Ivanov, 2023/10/19
- [PATCH v2 05/20] parallels: Set data_end value in parallels_check_leak(), Alexander Ivanov, 2023/10/19
- [PATCH v2 03/20] parallels: Add mark_unused() helper,
Alexander Ivanov <=
- [PATCH v2 08/20] parallels: Create used bitmap even if checks needed, Alexander Ivanov, 2023/10/19
- [PATCH v2 07/20] parallels: Add a note about used bitmap in parallels_check_duplicate(), Alexander Ivanov, 2023/10/19
- [PATCH v2 09/20] parallels: Make mark_used() and mark_unused() global functions, Alexander Ivanov, 2023/10/19
- [PATCH v2 10/20] parallels: Add dirty bitmaps saving, Alexander Ivanov, 2023/10/19
- [PATCH v2 12/20] parallels: Handle L1 entries equal to one, Alexander Ivanov, 2023/10/19
- [PATCH v2 13/20] parallels: Make a loaded dirty bitmap persistent, Alexander Ivanov, 2023/10/19