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d6L3URbsvCA7z+GFpGstl4nKg1knmjhjf1Ovbz08nV2yB5KNqlOmK6NT5fEwxmDlJ2eR2cmuGsA Ean9G7NaGSNuR1EZFJw== On 21/09/2026 09:37, John Garry wrote: A reminder on this one ... or are we just going to leave this broken? > > Currently the NVMe multipath partition diskstats are not maintained. > This is because the functionality to update the diskstats only updates > for the whole disk (and not per partition). > > As an example: > $ ./fio_read nvme1n1p1 # run traffic on /dev/nvme1n1p1 > ... > $ more /proc/diskstats | grep nvme1 > 259 2 nvme1c1n1 49857 0 400344 768565 0 0 0 0 0 2334 768565 0 0 0 0 0 0 > 259 3 nvme1n1 99710 0 800680 1599285 0 0 0 0 0 2346 1599285 0 0 0 0 0 0 > 259 5 nvme1n1p1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 259 4 nvme1c2n1 49853 0 400336 831472 0 0 0 0 0 2315 831472 0 0 0 0 0 0 > > Notice how all values are 0 for nvme1n1p1. > > This series addresses that problem by first updating the gendisk code to > create the partition table for hidden disks, as suggested by Keith. > > This is done by cloning the partition table from the multipath disk. > > Secondly the NVMe multipath functionality to handle the diskstats is > modified to handle the gendisk partition, by looking up this partition > from the per-path disk partition. > > Difference to v3: > - Add block device operation disk changed CB > > Difference to v2: > - don't scan per-path disk, and clone from multipath disk instead > > John Garry (4): > block: support cloning partitions > block: don't show partition diskstats for GENHD_FL_HIDDEN > nvme-multipath: clone head disk partitions to per-path disks > nvme-multipath: fix diskstats for partitions > > block/genhd.c | 3 +- > block/partitions/core.c | 43 ++++++++++++++++++ > drivers/nvme/host/multipath.c | 83 ++++++++++++++++++++++++++++++----- > include/linux/blkdev.h | 2 + > 4 files changed, 120 insertions(+), 11 deletions(-) >