Hello, This patchset converts dm to REQ_FLUSH/FUA, which was the last remaining one. I've put patches on top of the previous patches for easier review. The series can be trivially reordered so that the order is more logical. Jens, please let me know if you want it to be reordered. The dm conversion is _lightly_ tested. Please proceed with caution. In particular, I haven't tested dm implementation at all. So, it probably is best to hold off merging these bits until dm people can verify the conversion is correct. 0001-block-make-__blk_rq_prep_clone-copy-most-command-fla.patch 0002-dm-implement-REQ_FLUSH-FUA-support.patch 0003-dm-relax-ordering-of-bio-based-flush-implementation.patch 0004-block-remove-the-WRITE_BARRIER-flag.patch Differences from the previous attempt[1] are, * I was wrong when I wrote that flush retry logic was dropped. What got dropped was -EOPNOTSUPP handling. The retry behavior used by multipath remains the same. As blindly retrying flushes could be dangerous, a FIXME comment is added. * bio-based dm now also advertises REQ_FLUSH | REQ_FUA capability as block layer now filters out REQ_FLUSH if not supported by the queue. * 0002-dm-implement-REQ_FLUSH-FUA-support.patch added to update __blk_rq_prep_clone() to copy most REQ_* flags including FLUSH and FUA and request-based dm now advertises REQ_FLUSH | REQ_FUA support. * dm_request_fn() now explicitly plugs other requests while a flush request is in progress. This is to avoid starving flush sequence which uses device draining to check whether each step is complete. * 0003-block-remove-the-WRITE_BARRIER-flag.patch added to drop needless ordering around flush handling. This patchset is on top of "block, fs: replace HARDBARRIER with FLUSH/FUA" patchset[2] and available in the following git tree git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git flush-fua and contains the following changes. block/blk-core.c | 4 drivers/md/dm-crypt.c | 2 drivers/md/dm-io.c | 20 -- drivers/md/dm-log.c | 2 drivers/md/dm-raid1.c | 8 - drivers/md/dm-region-hash.c | 16 +- drivers/md/dm-snap-persistent.c | 2 drivers/md/dm-snap.c | 6 drivers/md/dm-stripe.c | 2 drivers/md/dm.c | 277 +++++++++++++++------------------------- include/linux/blk_types.h | 1 include/linux/fs.h | 3 12 files changed, 131 insertions(+), 212 deletions(-) Thanks. -- tejun [1] http://thread.gmane.org/gmane.linux.raid/29100/focus=29104 [2] http://thread.gmane.org/gmane.linux.kernel/1022363 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
