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[PATCH v4 05/21] parallels: Add parallels_mark_unused() helper
From: |
Alexander Ivanov |
Subject: |
[PATCH v4 05/21] parallels: Add parallels_mark_unused() helper |
Date: |
Thu, 28 Dec 2023 11:12:16 +0100 |
Add a helper to set unused areas in the used bitmap.
Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
---
block/parallels.c | 18 ++++++++++++++++++
block/parallels.h | 2 ++
2 files changed, 20 insertions(+)
diff --git a/block/parallels.c b/block/parallels.c
index 4470519656..13726fb3d5 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -196,6 +196,24 @@ int parallels_mark_used(BlockDriverState *bs, unsigned
long *bitmap,
return 0;
}
+int parallels_mark_unused(BlockDriverState *bs, unsigned long *bitmap,
+ uint32_t bitmap_size, int64_t off, uint32_t count)
+{
+ BDRVParallelsState *s = bs->opaque;
+ uint32_t cluster_end, cluster_index = host_cluster_index(s, off);
+ unsigned long next_unused;
+ cluster_end = cluster_index + count;
+ if (cluster_end > bitmap_size) {
+ return -E2BIG;
+ }
+ next_unused = find_next_zero_bit(bitmap, cluster_end, cluster_index);
+ if (next_unused < cluster_end) {
+ 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
diff --git a/block/parallels.h b/block/parallels.h
index 68077416b1..02b857b4a4 100644
--- a/block/parallels.h
+++ b/block/parallels.h
@@ -92,6 +92,8 @@ typedef struct BDRVParallelsState {
int parallels_mark_used(BlockDriverState *bs, unsigned long *bitmap,
uint32_t bitmap_size, int64_t off, uint32_t count);
+int parallels_mark_unused(BlockDriverState *bs, unsigned long *bitmap,
+ uint32_t bitmap_size, int64_t off, uint32_t count);
int GRAPH_RDLOCK
parallels_read_format_extension(BlockDriverState *bs, int64_t ext_off,
--
2.40.1
- [PATCH v4 00/21] parallels: Add full dirty bitmap support, Alexander Ivanov, 2023/12/28
- [PATCH v4 01/21] parallels: Set s->used_bmap to NULL in parallels_free_used_bitmap(), Alexander Ivanov, 2023/12/28
- [PATCH v4 03/21] parallels: Make mark_used() a global function, Alexander Ivanov, 2023/12/28
- [PATCH v4 02/21] parallels: Move inactivation code to a separate function, Alexander Ivanov, 2023/12/28
- [PATCH v4 04/21] parallels: Limit search in parallels_mark_used to the last marked claster, Alexander Ivanov, 2023/12/28
- [PATCH v4 14/21] parallels: Make a loaded dirty bitmap persistent, Alexander Ivanov, 2023/12/28
- [PATCH v4 16/21] parallels: Truncate images on the last used cluster, Alexander Ivanov, 2023/12/28
- [PATCH v4 17/21] parallels: Check unused clusters in parallels_check_leak(), Alexander Ivanov, 2023/12/28
- [PATCH v4 18/21] parallels: Remove unnecessary data_end field, Alexander Ivanov, 2023/12/28
- [PATCH v4 05/21] parallels: Add parallels_mark_unused() helper,
Alexander Ivanov <=
- [PATCH v4 07/21] parallels: Set data_end value in parallels_check_leak(), Alexander Ivanov, 2023/12/28
- [PATCH v4 06/21] parallels: Move host clusters allocation to a separate function, Alexander Ivanov, 2023/12/28
- [PATCH v4 15/21] parallels: Reverse a conditional in parallels_check_leak() to reduce indents, Alexander Ivanov, 2023/12/28
- [PATCH v4 09/21] parallels: Add a note about used bitmap in parallels_check_duplicate(), Alexander Ivanov, 2023/12/28
- [PATCH v4 11/21] parallels: Add dirty bitmaps saving, Alexander Ivanov, 2023/12/28
- [PATCH v4 08/21] parallels: Recreate used bitmap in parallels_check_leak(), Alexander Ivanov, 2023/12/28
- [PATCH v4 19/21] tests: Add parallels images support to test 165, Alexander Ivanov, 2023/12/28
- [PATCH v4 13/21] parallels: Handle L1 entries equal to one, Alexander Ivanov, 2023/12/28
- [PATCH v4 21/21] tests: Add parallels format support to image-fleecing, Alexander Ivanov, 2023/12/28