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authorFam Zheng <famz@redhat.com>2015-06-08 13:56:10 +0800
committerStefan Hajnoczi <stefanha@redhat.com>2015-07-02 10:06:23 +0100
commit508249952c0ea7472c62e17bf8132295dab4912d (patch)
tree0097014b93cf0e14fe7208b1c1d2123f3201f07c /block.c
parentdcfb3beb5130694b76b57de109619fcbf9c7e5b5 (diff)
downloadqemu-arm-508249952c0ea7472c62e17bf8132295dab4912d.tar.gz
block: Fix dirty bitmap in bdrv_co_discard
Unsetting dirty globally with discard is not very correct. The discard may zero out sectors (depending on can_write_zeroes_with_unmap), we should replicate this change to destination side to make sure that the guest sees the same data. Calling bdrv_reset_dirty also troubles mirror job because the hbitmap iterator doesn't expect unsetting of bits after current position. So let's do it the opposite way which fixes both problems: set the dirty bits if we are to discard it. Reported-by: wangxiaolong@ucloud.cn Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block.c')
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