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List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "fam@euphon.net" , "kwolf@redhat.com" , "qemu-devel@nongnu.org" , Denis Lunev Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 9/11/19 11:13 AM, Vladimir Sementsov-Ogievskiy wrote: > 07.08.2019 19:27, John Snow wrote: >> >> >> On 8/6/19 12:19 PM, Vladimir Sementsov-Ogievskiy wrote: >>> 06.08.2019 19:09, Max Reitz wrote: >>>> On 06.08.19 17:26, Vladimir Sementsov-Ogievskiy wrote: >>>>> hbitmap_reset has an unobvious property: it rounds requested region up. >>>>> It may provoke bugs, like in recently fixed write-blocking mode of >>>>> mirror: user calls reset on unaligned region, not keeping in mind that >>>>> there are possible unrelated dirty bytes, covered by rounded-up region >>>>> and information of this unrelated "dirtiness" will be lost. >>>>> >>>>> Make hbitmap_reset strict: assert that arguments are aligned, allowing >>>>> only one exception when @start + @count == hb->orig_size. It's needed >>>>> to comfort users of hbitmap_next_dirty_area, which cares about >>>>> hb->orig_size. >>>>> >>>>> Signed-off-by: Vladimir Sementsov-Ogievskiy >>>>> --- >>>>> >>>>> v2 based on Max's https://github.com/XanClic/qemu.git block >>>>> which will be merged soon to 4.1, and this patch goes to 4.2 >>>>> Based-on: https://github.com/XanClic/qemu.git block >>>>> >>>>> v1 was "[PATCH] util/hbitmap: fix unaligned reset", and as I understand >>>>> we all agreed to just assert alignment instead of aligning down >>>>> automatically. >>>>> >>>>> include/qemu/hbitmap.h | 5 +++++ >>>>> tests/test-hbitmap.c | 2 +- >>>>> util/hbitmap.c | 4 ++++ >>>>> 3 files changed, 10 insertions(+), 1 deletion(-) >>>>> >>>>> diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h >>>>> index 4afbe6292e..7865e819ca 100644 >>>>> --- a/include/qemu/hbitmap.h >>>>> +++ b/include/qemu/hbitmap.h >>>>> @@ -132,6 +132,11 @@ void hbitmap_set(HBitmap *hb, uint64_t start, uint64_t count); >>>>> * @count: Number of bits to reset. >>>>> * >>>>> * Reset a consecutive range of bits in an HBitmap. >>>>> + * @start and @count must be aligned to bitmap granularity. The only exception >>>>> + * is resetting the tail of the bitmap: @count may be equal to @start + >>>>> + * hb->orig_size, >>>> >>>> s/@start + hb->orig_size/hb->orig_size - @start/, I think. >>> >>> Ha, I wanted to say start + count equal to orig_size. Yours is OK too of course. >>> >>>> >>>>> in this case @count may be not aligned. @start + @count >>>> >>>> +are >>>> >>>> With those fixed: >>>> >>>> Reviewed-by: Max Reitz >>> >>> Thanks! >>> >> >> I'll add this to the pile for 4.2, after I fix the rebase conflicts that >> arose from 4.1-rc4. >> > > Hi! > > Didn't you forget, or should I resend? > > I must have dropped the patch by accident during the rebasing. As an apology, I squashed in Max's suggestions from the list. Check that they look OK, please? Thanks, applied to my bitmaps tree: https://github.com/jnsnow/qemu/commits/bitmaps https://github.com/jnsnow/qemu.git --js