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[PATCH v3 04/21] parallels: Add parallels_mark_unused() helper
From: |
Alexander Ivanov |
Subject: |
[PATCH v3 04/21] parallels: Add parallels_mark_unused() helper |
Date: |
Fri, 27 Oct 2023 09:46:19 +0200 |
Add a helper to set unused areas in the used bitmap.
Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
---
block/parallels.c | 17 +++++++++++++++++
block/parallels.h | 2 ++
2 files changed, 19 insertions(+)
diff --git a/block/parallels.c b/block/parallels.c
index e9a8cbe430..a30bb5fe0d 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -195,6 +195,23 @@ 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_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
diff --git a/block/parallels.h b/block/parallels.h
index bb18ee0527..31ebbd6846 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 parallels_read_format_extension(BlockDriverState *bs,
int64_t ext_off, Error **errp);
--
2.34.1
- [PATCH v3 03/21] parallels: Make mark_used() a global function, (continued)
- [PATCH v3 03/21] parallels: Make mark_used() a global function, Alexander Ivanov, 2023/10/27
- [PATCH v3 09/21] parallels: Create used bitmap even if checks needed, Alexander Ivanov, 2023/10/27
- [PATCH v3 05/21] parallels: Move host clusters allocation to a separate function, Alexander Ivanov, 2023/10/27
- [PATCH v3 18/21] parallels: Remove unnecessary data_end field, Alexander Ivanov, 2023/10/27
- [PATCH v3 21/21] tests: Add parallels format support to image-fleecing, Alexander Ivanov, 2023/10/27
- [PATCH v3 10/21] parallels: Add dirty bitmaps saving, Alexander Ivanov, 2023/10/27
- [PATCH v3 14/21] parallels: Make a loaded dirty bitmap persistent, Alexander Ivanov, 2023/10/27
- [PATCH v3 17/21] parallels: Check unused clusters in parallels_check_leak(), Alexander Ivanov, 2023/10/27
- [PATCH v3 20/21] tests: Turned on 256, 299, 304 and block-status-cache for parallels format, Alexander Ivanov, 2023/10/27
- [PATCH v3 04/21] parallels: Add parallels_mark_unused() helper,
Alexander Ivanov <=
- [PATCH v3 15/21] parallels: Reverse a conditional in parallels_check_leak() to reduce indents, Alexander Ivanov, 2023/10/27
- [PATCH v3 08/21] parallels: Add a note about used bitmap in parallels_check_duplicate(), Alexander Ivanov, 2023/10/27
- [PATCH v3 19/21] tests: Add parallels images support to test 165, Alexander Ivanov, 2023/10/27
- [PATCH v3 07/21] parallels: Recreate used bitmap in parallels_check_leak(), Alexander Ivanov, 2023/10/27
- [PATCH v3 16/21] parallels: Truncate images on the last used cluster, Alexander Ivanov, 2023/10/27
- [PATCH v3 12/21] parallels: Let image extensions work in RW mode, Alexander Ivanov, 2023/10/27
- [PATCH v3 06/21] parallels: Set data_end value in parallels_check_leak(), Alexander Ivanov, 2023/10/27
- [PATCH v3 11/21] parallels: Mark parallels_inactivate GRAPH_RDLOCK, guard parallels_close, Alexander Ivanov, 2023/10/27