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H A D | qcow2.h | e034f5bc Mon Jun 19 13:40:03 GMT 2017 Alberto Garcia <berto@igalia.com> qcow2: Use unsigned int for both members of Qcow2COWRegion
Qcow2COWRegion has two attributes:
- The offset of the COW region from the start of the first cluster touched by the I/O request. Since it's always going to be positive and the maximum request size is at most INT_MAX, we can use a regular unsigned int to store this offset.
- The size of the COW region in bytes. This is guaranteed to be >= 0, so we should use an unsigned type instead.
In x86_64 this reduces the size of Qcow2COWRegion from 16 to 8 bytes. It will also help keep some assertions simpler now that we know that there are no negative numbers.
The prototype of do_perform_cow() is also updated to reflect these changes.
Signed-off-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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H A D | qcow2-cluster.c | e034f5bc Mon Jun 19 13:40:03 GMT 2017 Alberto Garcia <berto@igalia.com> qcow2: Use unsigned int for both members of Qcow2COWRegion
Qcow2COWRegion has two attributes:
- The offset of the COW region from the start of the first cluster touched by the I/O request. Since it's always going to be positive and the maximum request size is at most INT_MAX, we can use a regular unsigned int to store this offset.
- The size of the COW region in bytes. This is guaranteed to be >= 0, so we should use an unsigned type instead.
In x86_64 this reduces the size of Qcow2COWRegion from 16 to 8 bytes. It will also help keep some assertions simpler now that we know that there are no negative numbers.
The prototype of do_perform_cow() is also updated to reflect these changes.
Signed-off-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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