From: Alberto Garcia <berto@igalia.com>
To: qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
Alberto Garcia <berto@igalia.com>,
qemu-block@nongnu.org, Derek Su <dereksu@qnap.com>,
Max Reitz <mreitz@redhat.com>
Subject: [PATCH v6 13/32] qcow2: Update get/set_l2_entry() and add get/set_l2_bitmap()
Date: Sun, 24 May 2020 16:51:33 +0200 [thread overview]
Message-ID: <bc529ff3ba095c89f36fd107650f940a4bf53042.1590331741.git.berto@igalia.com> (raw)
In-Reply-To: <cover.1590331741.git.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>
---
block/qcow2.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/block/qcow2.h b/block/qcow2.h
index 95cc16a089..5c6bf48c7a 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;
--
2.20.1
next prev parent reply other threads:[~2020-05-24 15:07 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-24 14:51 [PATCH v6 00/32] Add subcluster allocation to qcow2 Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 01/32] qcow2: Make Qcow2AioTask store the full host offset Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 02/32] qcow2: Convert qcow2_get_cluster_offset() into qcow2_get_host_offset() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 03/32] qcow2: Add calculate_l2_meta() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 04/32] qcow2: Split cluster_needs_cow() out of count_cow_clusters() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 05/32] qcow2: Process QCOW2_CLUSTER_ZERO_ALLOC clusters in handle_copied() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 06/32] qcow2: Add get_l2_entry() and set_l2_entry() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 07/32] qcow2: Document the Extended L2 Entries feature Alberto Garcia
2020-05-26 19:54 ` Eric Blake
2020-05-24 14:51 ` [PATCH v6 08/32] qcow2: Add dummy has_subclusters() function Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 09/32] qcow2: Add subcluster-related fields to BDRVQcow2State Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 10/32] qcow2: Add offset_to_sc_index() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 11/32] qcow2: Add offset_into_subcluster() and size_to_subclusters() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 12/32] qcow2: Add l2_entry_size() Alberto Garcia
2020-05-24 14:51 ` Alberto Garcia [this message]
2020-05-24 14:51 ` [PATCH v6 14/32] qcow2: Add QCow2SubclusterType and qcow2_get_subcluster_type() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 15/32] qcow2: Add qcow2_get_subcluster_range_type() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 16/32] qcow2: Add qcow2_cluster_is_allocated() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 17/32] qcow2: Add cluster type parameter to qcow2_get_host_offset() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 18/32] qcow2: Replace QCOW2_CLUSTER_* with QCOW2_SUBCLUSTER_* Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 19/32] qcow2: Handle QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 20/32] qcow2: Add subcluster support to calculate_l2_meta() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 21/32] qcow2: Add subcluster support to qcow2_get_host_offset() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 22/32] qcow2: Add subcluster support to zero_in_l2_slice() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 23/32] qcow2: Add subcluster support to discard_in_l2_slice() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 24/32] qcow2: Add subcluster support to check_refcounts_l2() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 25/32] qcow2: Update L2 bitmap in qcow2_alloc_cluster_link_l2() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 26/32] qcow2: Clear the L2 bitmap when allocating a compressed cluster Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 27/32] qcow2: Add subcluster support to handle_alloc_space() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 28/32] qcow2: Add subcluster support to qcow2_co_pwrite_zeroes() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 29/32] qcow2: Add subcluster support to qcow2_measure() Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 30/32] qcow2: Add the 'extended_l2' option and the QCOW2_INCOMPAT_EXTL2 bit Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 31/32] qcow2: Assert that expand_zero_clusters_in_l1() does not support subclusters Alberto Garcia
2020-05-24 14:51 ` [PATCH v6 32/32] iotests: Add tests for qcow2 images with extended L2 entries Alberto Garcia
2020-05-24 16:29 ` [PATCH v6 00/32] Add subcluster allocation to qcow2 no-reply
2020-05-24 16:34 ` no-reply
2020-05-25 16:06 ` Alberto Garcia
2020-05-24 16:42 ` no-reply
2020-05-24 16:46 ` no-reply
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