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docs: Define refcount_bits value

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The 'refcount_bits' term used in the description of refcount block entry is
not defined in the specification. The definition is added in the
'refcount_order' section where refcount_bits was used as 'width in bits'.

Signed-off-by: Maria Kustova <maria.k@catit.be>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Maria Kustova 2014-05-23 17:41:29 +04:00 committed by Stefan Hajnoczi
parent ce782938b8
commit 6815bce542
1 changed files with 3 additions and 2 deletions
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docs/specs/qcow2.txt
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@ -107,8 +107,9 @@ in the description of a field.
96 - 99: refcount_order
Describes the width of a reference count block entry (width
in bits = 1 << refcount_order). For version 2 images, the
order is always assumed to be 4 (i.e. the width is 16 bits).
in bits: refcount_bits = 1 << refcount_order). For version 2
images, the order is always assumed to be 4
(i.e. refcount_bits = 16).
100 - 103: header_length
Length of the header structure in bytes. For version 2