From: Max Reitz <mreitz@redhat.com>
To: qemu-block@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
Peter Maydell <peter.maydell@linaro.org>,
qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>
Subject: [PULL 13/34] qcow2: Update get/set_l2_entry() and add get/set_l2_bitmap()
Date: Tue, 25 Aug 2020 10:32:50 +0200 [thread overview]
Message-ID: <20200825083311.1098442-14-mreitz@redhat.com> (raw)
In-Reply-To: <20200825083311.1098442-1-mreitz@redhat.com>
From: Alberto Garcia <berto@igalia.com>
Extended L2 entries are 128-bit wide: 64 bits for the entry itself and
64 bits for the subcluster allocation bitmap.
In order to support them correctly get/set_l2_entry() need to be
updated so they take the entry width into account in order to
calculate the correct offset.
This patch also adds the get/set_l2_bitmap() functions that are
used to access the bitmaps. For convenience we allow calling
get_l2_bitmap() on images without subclusters. In this case the
returned value is always 0 and has no meaning.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <6ee0f81ae3329c991de125618b3675e1e46acdbb.1594396418.git.berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
block/qcow2.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/block/qcow2.h b/block/qcow2.h
index 46b351229a..82b86f6cec 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -533,15 +533,36 @@ static inline size_t l2_entry_size(BDRVQcow2State *s)
static inline uint64_t get_l2_entry(BDRVQcow2State *s, uint64_t *l2_slice,
int idx)
{
+ idx *= l2_entry_size(s) / sizeof(uint64_t);
return be64_to_cpu(l2_slice[idx]);
}
+static inline uint64_t get_l2_bitmap(BDRVQcow2State *s, uint64_t *l2_slice,
+ int idx)
+{
+ if (has_subclusters(s)) {
+ idx *= l2_entry_size(s) / sizeof(uint64_t);
+ return be64_to_cpu(l2_slice[idx + 1]);
+ } else {
+ return 0; /* For convenience only; this value has no meaning. */
+ }
+}
+
static inline void set_l2_entry(BDRVQcow2State *s, uint64_t *l2_slice,
int idx, uint64_t entry)
{
+ idx *= l2_entry_size(s) / sizeof(uint64_t);
l2_slice[idx] = cpu_to_be64(entry);
}
+static inline void set_l2_bitmap(BDRVQcow2State *s, uint64_t *l2_slice,
+ int idx, uint64_t bitmap)
+{
+ assert(has_subclusters(s));
+ idx *= l2_entry_size(s) / sizeof(uint64_t);
+ l2_slice[idx + 1] = cpu_to_be64(bitmap);
+}
+
static inline bool has_data_file(BlockDriverState *bs)
{
BDRVQcow2State *s = bs->opaque;
--
2.26.2
next prev parent reply other threads:[~2020-08-25 8:37 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-25 8:32 [PULL 00/34] Block patches Max Reitz
2020-08-25 8:32 ` [PULL 01/34] qcow2: Make Qcow2AioTask store the full host offset Max Reitz
2020-08-25 8:32 ` [PULL 02/34] qcow2: Convert qcow2_get_cluster_offset() into qcow2_get_host_offset() Max Reitz
2020-08-25 8:32 ` [PULL 03/34] qcow2: Add calculate_l2_meta() Max Reitz
2020-08-25 8:32 ` [PULL 04/34] qcow2: Split cluster_needs_cow() out of count_cow_clusters() Max Reitz
2020-08-25 8:32 ` [PULL 05/34] qcow2: Process QCOW2_CLUSTER_ZERO_ALLOC clusters in handle_copied() Max Reitz
2020-08-25 8:32 ` [PULL 06/34] qcow2: Add get_l2_entry() and set_l2_entry() Max Reitz
2020-08-25 8:32 ` [PULL 07/34] qcow2: Document the Extended L2 Entries feature Max Reitz
2020-08-25 8:32 ` [PULL 08/34] qcow2: Add dummy has_subclusters() function Max Reitz
2020-08-25 8:32 ` [PULL 09/34] qcow2: Add subcluster-related fields to BDRVQcow2State Max Reitz
2020-08-25 8:32 ` [PULL 10/34] qcow2: Add offset_to_sc_index() Max Reitz
2020-08-25 8:32 ` [PULL 11/34] qcow2: Add offset_into_subcluster() and size_to_subclusters() Max Reitz
2020-08-25 8:32 ` [PULL 12/34] qcow2: Add l2_entry_size() Max Reitz
2020-08-25 8:32 ` Max Reitz [this message]
2020-08-25 8:32 ` [PULL 14/34] qcow2: Add QCow2SubclusterType and qcow2_get_subcluster_type() Max Reitz
2020-08-25 8:32 ` [PULL 15/34] qcow2: Add qcow2_get_subcluster_range_type() Max Reitz
2020-08-25 8:32 ` [PULL 16/34] qcow2: Add qcow2_cluster_is_allocated() Max Reitz
2020-08-25 8:32 ` [PULL 17/34] qcow2: Add cluster type parameter to qcow2_get_host_offset() Max Reitz
2020-08-25 8:32 ` [PULL 18/34] qcow2: Replace QCOW2_CLUSTER_* with QCOW2_SUBCLUSTER_* Max Reitz
2020-08-25 8:32 ` [PULL 19/34] qcow2: Handle QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC Max Reitz
2020-08-25 8:32 ` [PULL 20/34] qcow2: Add subcluster support to calculate_l2_meta() Max Reitz
2020-08-25 8:32 ` [PULL 21/34] qcow2: Add subcluster support to qcow2_get_host_offset() Max Reitz
2020-08-25 8:32 ` [PULL 22/34] qcow2: Add subcluster support to zero_in_l2_slice() Max Reitz
2020-08-25 8:33 ` [PULL 23/34] qcow2: Add subcluster support to discard_in_l2_slice() Max Reitz
2020-08-25 8:33 ` [PULL 24/34] qcow2: Add subcluster support to check_refcounts_l2() Max Reitz
2020-08-25 8:33 ` [PULL 25/34] qcow2: Update L2 bitmap in qcow2_alloc_cluster_link_l2() Max Reitz
2020-08-25 8:33 ` [PULL 26/34] qcow2: Clear the L2 bitmap when allocating a compressed cluster Max Reitz
2020-08-25 8:33 ` [PULL 27/34] qcow2: Add subcluster support to handle_alloc_space() Max Reitz
2020-08-25 8:33 ` [PULL 28/34] qcow2: Add subcluster support to qcow2_co_pwrite_zeroes() Max Reitz
2020-08-25 8:33 ` [PULL 29/34] qcow2: Add subcluster support to qcow2_measure() Max Reitz
2020-08-25 8:33 ` [PULL 30/34] qcow2: Add prealloc field to QCowL2Meta Max Reitz
2020-08-25 8:33 ` [PULL 31/34] qcow2: Add the 'extended_l2' option and the QCOW2_INCOMPAT_EXTL2 bit Max Reitz
2020-08-25 8:33 ` [PULL 32/34] qcow2: Allow preallocation and backing files if extended_l2 is set Max Reitz
2020-08-25 8:33 ` [PULL 33/34] qcow2: Assert that expand_zero_clusters_in_l1() does not support subclusters Max Reitz
2020-08-25 8:33 ` [PULL 34/34] iotests: Add tests for qcow2 images with extended L2 entries Max Reitz
2020-08-25 14:01 ` [PULL 00/34] Block patches Peter Maydell
2020-08-25 14:22 ` Alberto Garcia
2020-08-25 15:13 ` Max Reitz
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