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qcow2: Add refcount_bits to format-specific info

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Add the bit width of every refcount entry to the format-specific
information.

In contrast to lazy_refcounts and the corrupt flag, this should be
always emitted, even for compat=0.10 although it does not support any
refcount width other than 16 bits. This is because if a boolean is
optional, one normally assumes it to be false when omitted; but if an
integer is not specified, it is rather difficult to guess its value.

This new field breaks some test outputs, fix them.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2015-02-10 15:28:44 -05:00 • committed by Kevin Wolf
parent 346a53df38
commit 0709c5a153
7 changed files with 37 additions and 10 deletions
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4
block/qcow2.c
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@ -2482,7 +2482,8 @@ static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs)
};
if (s->qcow_version == 2) {
*spec_info->qcow2 = (ImageInfoSpecificQCow2){
.compat = g_strdup("0.10"),
.compat = g_strdup("0.10"),
.refcount_bits = s->refcount_bits,
};
} else if (s->qcow_version == 3) {
*spec_info->qcow2 = (ImageInfoSpecificQCow2){
@ -2493,6 +2494,7 @@ static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs)
.corrupt = s->incompatible_features &
QCOW2_INCOMPAT_CORRUPT,
.has_corrupt = true,
.refcount_bits = s->refcount_bits,
};
}