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[PATCH v9 10/34] qcow2: Add offset_to_sc_index()
From: |
Alberto Garcia |
Subject: |
[PATCH v9 10/34] qcow2: Add offset_to_sc_index() |
Date: |
Sun, 28 Jun 2020 13:02:19 +0200 |
For a given offset, return the subcluster number within its cluster
(i.e. with 32 subclusters per cluster it returns a number between 0
and 31).
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/qcow2.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/block/qcow2.h b/block/qcow2.h
index eee4c8de9c..2503374677 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -581,6 +581,11 @@ static inline int offset_to_l2_slice_index(BDRVQcow2State
*s, int64_t offset)
return (offset >> s->cluster_bits) & (s->l2_slice_size - 1);
}
+static inline int offset_to_sc_index(BDRVQcow2State *s, int64_t offset)
+{
+ return (offset >> s->subcluster_bits) & (s->subclusters_per_cluster - 1);
+}
+
static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
{
return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
--
2.20.1
- [PATCH v9 00/34] Add subcluster allocation to qcow2, Alberto Garcia, 2020/06/28
- [PATCH v9 26/34] qcow2: Clear the L2 bitmap when allocating a compressed cluster, Alberto Garcia, 2020/06/28
- [PATCH v9 03/34] qcow2: Add calculate_l2_meta(), Alberto Garcia, 2020/06/28
- [PATCH v9 04/34] qcow2: Split cluster_needs_cow() out of count_cow_clusters(), Alberto Garcia, 2020/06/28
- [PATCH v9 06/34] qcow2: Add get_l2_entry() and set_l2_entry(), Alberto Garcia, 2020/06/28
- [PATCH v9 10/34] qcow2: Add offset_to_sc_index(),
Alberto Garcia <=
- [PATCH v9 08/34] qcow2: Add dummy has_subclusters() function, Alberto Garcia, 2020/06/28
- [PATCH v9 05/34] qcow2: Process QCOW2_CLUSTER_ZERO_ALLOC clusters in handle_copied(), Alberto Garcia, 2020/06/28
- [PATCH v9 02/34] qcow2: Convert qcow2_get_cluster_offset() into qcow2_get_host_offset(), Alberto Garcia, 2020/06/28
- [PATCH v9 07/34] qcow2: Document the Extended L2 Entries feature, Alberto Garcia, 2020/06/28
- [PATCH v9 13/34] qcow2: Update get/set_l2_entry() and add get/set_l2_bitmap(), Alberto Garcia, 2020/06/28
- [PATCH v9 24/34] qcow2: Add subcluster support to check_refcounts_l2(), Alberto Garcia, 2020/06/28
- [PATCH v9 29/34] qcow2: Add subcluster support to qcow2_measure(), Alberto Garcia, 2020/06/28