Hi, Here is v3 of the request-based DM blk-support patchset. I've also published a git repo here: https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/log/?h=dm-for-3.20-blk-mq I found quite a few issues with v2 for both blk-mq and old request-based DM. I've still attributed the original patches from Keith to him even though I fixed/rewrote significant portions. Keith, I'm happy to leave attribution like this unless you'd prefer I change it. In general, I'm not in love with the amount of churn in dm.c's request-based DM code. BUT I'm also not opposed to these changes if others have a pressing need for blk-mq support landing for dm-multipath. So input on who cares about this work would be appreciated. I'd like to get an idea of the kinds of configurations people are looking to deploy. These changes have seen basic dm-multipath testing against both blk-mq (virtio-blk) and traditional SCSI devices. Error paths are largely untested, as is dm-multipath's ability to function properly in the face of heavy IO with concurrent path failures. But I'm publishing this work now in the hopes that others with real blk-mq devices can test more fully. Keith, it'd be awesome if you could provide the same test coverage you did for blk-mq testing of your v2. I'll work with Red Hat's Storage QE to hammer on the old request-based side. But with the holiday fast approaching I likely won't have full test coverage until after the New Year. Keith Busch (4): block: require blk_rq_prep_clone() be given an initialized clone request block: add blk-mq support to blk_insert_cloned_request() dm: submit stacked requests in irq enabled context dm: allocate requests from target when stacking on blk-mq devices Mike Snitzer (4): block: initialize bio member of blk-mq request to NULL block: mark blk-mq devices as stackable dm: remove exports for request-based interfaces without external callers dm: split request structure out from dm_rq_target_io structure block/blk-core.c | 7 +- block/blk-mq.c | 1 + drivers/md/dm-mpath.c | 53 +++++-- drivers/md/dm-table.c | 34 ++++- drivers/md/dm-target.c | 15 +- drivers/md/dm.c | 336 +++++++++++++++++++++++++++++------------- drivers/md/dm.h | 8 +- include/linux/blkdev.h | 1 + include/linux/device-mapper.h | 10 +- 9 files changed, 335 insertions(+), 130 deletions(-) -- 1.9.3 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
