The whole sries looks fine to me: Reviewed-by: Christoph Hellwig <hch@xxxxxx> There are a few pieces of future work on top of this I'd rather see sooner than later though: - use REQ_OP_FLUSH for all empty flushes, including those at the bio level. - merge the req->cmd_type values into req->op. Right now that's basically only a new REQ_OP_BLOCK_PC (or better REQ_OP_SCSI while we're at it) and a REQ_OP_DRV_PRIV as the last value. - drop as many of the crazy defines based on REQ_* in fs.h (e.g. (READ_SYNC, WRITE_SYNC, WRITE_ODIRECT, WRITE_FLUSH, WRITE_FUA, WRITE_FLUSH_FUA, RW_MASK, RWA_MASK) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel