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[PATCH v5 10/31] qcow2: Add offset_to_sc_index()
From: |
Alberto Garcia |
Subject: |
[PATCH v5 10/31] qcow2: Add offset_to_sc_index() |
Date: |
Tue, 5 May 2020 19:38:10 +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 <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
Reviewed-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
block/qcow2.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/block/qcow2.h b/block/qcow2.h
index 9d8ca8068c..e68febb15b 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -563,6 +563,11 @@ 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 v5 00/31] Add subcluster allocation to qcow2, Alberto Garcia, 2020/05/05
- [PATCH v5 10/31] qcow2: Add offset_to_sc_index(),
Alberto Garcia <=
- [PATCH v5 08/31] qcow2: Add dummy has_subclusters() function, Alberto Garcia, 2020/05/05
- [PATCH v5 11/31] qcow2: Add offset_into_subcluster() and size_to_subclusters(), Alberto Garcia, 2020/05/05
- [PATCH v5 03/31] qcow2: Add calculate_l2_meta(), Alberto Garcia, 2020/05/05
- [PATCH v5 22/31] qcow2: Add subcluster support to discard_in_l2_slice(), Alberto Garcia, 2020/05/05
- [PATCH v5 18/31] qcow2: Handle QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC, Alberto Garcia, 2020/05/05
- [PATCH v5 01/31] qcow2: Make Qcow2AioTask store the full host offset, Alberto Garcia, 2020/05/05
- [PATCH v5 02/31] qcow2: Convert qcow2_get_cluster_offset() into qcow2_get_host_offset(), Alberto Garcia, 2020/05/05
- [PATCH v5 09/31] qcow2: Add subcluster-related fields to BDRVQcow2State, Alberto Garcia, 2020/05/05