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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: devel-bounces@openvz.org Errors-To: devel-bounces@openvz.org On 10/6/26 17:52, Konstantin Khorenko wrote: >> drivers/md/dm-qcow2: truncate unused tail of image on suspend > ... >> Truncate the file to min(file_preallocated_area_start, used end). >> Skip the scan if md writeback failed, as refcounts on disk are stale >> then, and fall back to the old behaviour on scan error. > There is one more case of stale refcounts on disk: an image with > INCOMPATIBLE_FEATURES_DIRTY_BIT set. qcow2_check_convert_hdr() accepts it > (the check is commented out), and with qemu lazy refcounts that bit means > refcounts were not written for the last allocations, so they are too low. > > Today such an image loses data only when the allocator hands out a > cluster whose refcount is zero but which L2 still references. After this > patch the first suspend truncates live clusters at the tail without a > single write to the device. The image is already invalid per spec, so > this is not a regression in the strict sense, but either the commit > message should say that a dirty image is not supported, or the dirty-bit > check in qcow2_check_convert_hdr() should come back. Image should go clean into the kernel on first pass. _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel