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a=XiAAW1AwiKB2Y8Wsi+sD2Q==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=RD47p0oAkeU5bO7t-o6f:22 a=RpNjiQI2AAAA:8 a=ZpLeu3NvKOF0J3WGQBwA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: pG4XhbJivbIimZd72pMBOSf6h2B2pvH6 X-Proofpoint-ORIG-GUID: pG4XhbJivbIimZd72pMBOSf6h2B2pvH6 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI0MDA2MyBTYWx0ZWRfX8YkURSu1K0E3 /+xz/BkoHRipyYLANCDrEYaQAiWj+H/2uotSYpsoIarkKmmZhPHOv8BSXik7ungqKq44c7OYuLR 5UcdqFE1AHLglLMoQRuvKBewAbCWO3UCf+CtAapB3hDoPtC2++eq X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI0MDA2MyBTYWx0ZWRfX/Tt87EcF9F0h 1XELVHBfXPmwP9UzppQ5tIVCpIyMq24TaarRlIXLZVNRe+DgecAkspg/5SWbpYvBzmZehDlqOPh AlO6JgUSi6Q++lLXul0GTOmRiWOOTd0T/36FLlCxpZ7y6dvv1Tn1PpVMuKHNtn0qcN4ZhNsLOdj iQO6w/oxZBfDKjeqIswOmB1dniTK99ZHhQHLzAcV2FYcdnhs+KaA1eO7LFp7+dHmbWNPKMvlfPs 9f1d+HEnJ01NJmILE/R7z+h9m6QRthLnL4A4Wkd/932u2rU6uD1vtDr6E3uwesPsYtaNYdN1ioC pDhH3EPuw/6kZ4PeAzgrrBGmu0FwpItwesTr+FsKmIob+6SHr64gxoVBpVXycnf2SLov5l6mRnD SyhVo0xPRZqvTyMkKxvQKEZdhGcXkHjBc4s//yoCc7N+4If5MgMTppxwbcz1OXWbCQeyEbDNizT zaIcmrDgC9jZoPsyUpg== On 24/07/2026 06:01, Christoph Hellwig wrote: > On Tue, Jul 21, 2026 at 11:=E2=80=8A45:=E2=80=8A53AM +0000, John Garry wr= ote: > Setting as an > RFC as adding this extra bio field is not acceptable, but I > can't see h= ow to > lookup the original partition. In general it is not, but you should mark = this a >=20 >=20 > On Tue, Jul 21, 2026 at 11:45:53AM +0000, John Garry wrote: >> Setting as an RFC as adding this extra bio field is not acceptable, but I >> can't see how to lookup the original partition. >=20 > In general it is not, but you should mark this a block patch so that > Jens can better cream at you :) >=20 > I'm also not sure that supporting per-partition diskstats on a multipath > device makes too much sense, but then again there's a lot of setups > that are crazy and actually used.. >=20 It just seems to me that we should have same behaviour as if it were not=20 multipath. So we can't use bi_private as that can be set by original bio submitter.=20 I was thinking that this bdev pointer could be temp stashed in bi_next=20 (as it should be originally NULL), but that it dodgy and maybe won't=20 even work. Least worst I can think if is to alloc some temp memory per-bio in=20 nvme_ns_head_submit_bio() to hold this bdev pointer and original=20 bi_private, set bio->bi_private to that memory, and then set bi_private=20 back to original when we end the bio. But this is all crappy, especially=20 just for partition diskstats.