forked from luck/tmp_suning_uos_patched
d87f4c14f2
This patch converts bio-based dm to support REQ_FLUSH/FUA instead of now deprecated REQ_HARDBARRIER. * -EOPNOTSUPP handling logic dropped. * Preflush is handled as before but postflush is dropped and replaced with passing down REQ_FUA to member request_queues. This replaces one array wide cache flush w/ member specific FUA writes. * __split_and_process_bio() now calls __clone_and_map_flush() directly for flushes and guarantees all FLUSH bio's going to targets are zero ` length. * It's now guaranteed that all FLUSH bio's which are passed onto dm targets are zero length. bio_empty_barrier() tests are replaced with REQ_FLUSH tests. * Empty WRITE_BARRIERs are replaced with WRITE_FLUSHes. * Dropped unlikely() around REQ_FLUSH tests. Flushes are not unlikely enough to be marked with unlikely(). * Block layer now filters out REQ_FLUSH/FUA bio's if the request_queue doesn't support cache flushing. Advertise REQ_FLUSH | REQ_FUA capability. * Request based dm isn't converted yet. dm_init_request_based_queue() resets flush support to 0 for now. To avoid disturbing request based dm code, dm->flush_error is added for bio based dm while requested based dm continues to use dm->barrier_error. Lightly tested linear, stripe, raid1, snap and crypt targets. Please proceed with caution as I'm not familiar with the code base. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: dm-devel@redhat.com Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com> |
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.. | ||
.gitignore | ||
bitmap.c | ||
bitmap.h | ||
dm-bio-record.h | ||
dm-crypt.c | ||
dm-delay.c | ||
dm-exception-store.c | ||
dm-exception-store.h | ||
dm-io.c | ||
dm-ioctl.c | ||
dm-kcopyd.c | ||
dm-linear.c | ||
dm-log-userspace-base.c | ||
dm-log-userspace-transfer.c | ||
dm-log-userspace-transfer.h | ||
dm-log.c | ||
dm-mpath.c | ||
dm-mpath.h | ||
dm-path-selector.c | ||
dm-path-selector.h | ||
dm-queue-length.c | ||
dm-raid1.c | ||
dm-region-hash.c | ||
dm-round-robin.c | ||
dm-service-time.c | ||
dm-snap-persistent.c | ||
dm-snap-transient.c | ||
dm-snap.c | ||
dm-stripe.c | ||
dm-sysfs.c | ||
dm-table.c | ||
dm-target.c | ||
dm-uevent.c | ||
dm-uevent.h | ||
dm-zero.c | ||
dm.c | ||
dm.h | ||
faulty.c | ||
Kconfig | ||
linear.c | ||
linear.h | ||
Makefile | ||
md.c | ||
md.h | ||
multipath.c | ||
multipath.h | ||
raid0.c | ||
raid0.h | ||
raid1.c | ||
raid1.h | ||
raid5.c | ||
raid5.h | ||
raid10.c | ||
raid10.h |