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qcow2: Add l2_entry_size()

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qcow2 images with subclusters have 128-bit L2 entries. The first 64
bits contain the same information as traditional images and the last
64 bits form a bitmap with the status of each individual subcluster.

Because of that we cannot assume that L2 entries are sizeof(uint64_t)
anymore. This function returns the proper value for the image.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <d34d578bd0380e739e2dde3e8dd6187d3d249fa9.1594396418.git.berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Alberto Garcia 2020-07-10 18:12:54 +02:00 • committed by Max Reitz
parent 3e71981592
commit c8fd8554d9
4 changed files with 27 additions and 16 deletions
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9
block/qcow2.h
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@ -80,6 +80,10 @@
#define QCOW_EXTL2_SUBCLUSTERS_PER_CLUSTER 32
/* Size of normal and extended L2 entries */
#define L2E_SIZE_NORMAL (sizeof(uint64_t))
#define L2E_SIZE_EXTENDED (sizeof(uint64_t) * 2)
#define MIN_CLUSTER_BITS 9
#define MAX_CLUSTER_BITS 21
@ -521,6 +525,11 @@ static inline bool has_subclusters(BDRVQcow2State *s)
return false;
}
static inline size_t l2_entry_size(BDRVQcow2State *s)
{
return has_subclusters(s) ? L2E_SIZE_EXTENDED : L2E_SIZE_NORMAL;
}
static inline uint64_t get_l2_entry(BDRVQcow2State *s, uint64_t *l2_slice,
int idx)
{