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Erase/write mutate device state, but > flush does not. Please drop the blkcache_invalidate() call (and the > matching one in the non-DM inline below). > > > diff --git a/include/blk.h b/include/blk.h > > @@ -99,6 +99,7 @@ struct blk_desc { > > unsigned long (*block_erase)(struct blk_desc *block_dev, > > lbaint_t start, > > lbaint_t blkcnt); > > + unsigned long (*block_flush)(struct blk_desc *block_dev); > > This field lives in the !CONFIG_BLK (legacy) branch, but no legacy > driver in the series wires it up. The only consumer (NVMe) is DM-only. > Are you going to need the legacy plumbing? blk_dflush() is used in flush subcommand in cmd/blk_common.c (I also used it for tests in v3 of the upcoming series). -- Denis