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linux-stable/Documentation/device-mapper
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Heinz Mauelshagen 6e53636fe8 dm raid: add raid4/5/6 journal write-back support via journal_mode option 
Commit 63c32ed4af ("dm raid: add raid4/5/6 journaling support") added
journal support to close the raid4/5/6 "write hole" -- in terms of
writethrough caching.

Introduce a "journal_mode" feature and use the new
r5c_journal_mode_set() API to add support for switching the journal
device's cache mode between write-through (the current default) and
write-back.

NOTE: If the journal device is not layered on resilent storage and it
fails, write-through mode will cause the "write hole" to reoccur.  But
if the journal fails while in write-back mode it will cause data loss
for any dirty cache entries unless resilent storage is used for the
journal.

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2017-03-27 12:08:07 -04:00
..
cache-policies.txt dm cache: update cache-policies.txt now that mq is an alias for smq 2016-05-05 15:25:53 -04:00
cache.txt dm cache metadata: add "metadata2" feature 2017-02-16 13:12:47 -05:00
delay.txt Documentation/device-mapper: s/getsize/getsz/ 2016-12-14 10:54:27 +01:00
dm-crypt.txt dm crypt: optionally support larger encryption sector size 2017-03-24 15:54:21 -04:00
dm-flakey.txt block: rename bio bi_rw to bi_opf 2016-08-07 14:41:02 -06:00
dm-integrity.txt dm integrity: add recovery mode 2017-03-24 15:54:23 -04:00
dm-io.txt
dm-log.txt dm log userspace: fix comment hyphens 2011-10-31 20:21:22 +00:00
dm-queue-length.txt
dm-raid.txt dm raid: add raid4/5/6 journal write-back support via journal_mode option 2017-03-27 12:08:07 -04:00
dm-service-time.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
dm-uevent.txt
era.txt dm: add era target 2014-03-27 16:56:23 -04:00
kcopyd.txt
linear.txt Documentation/device-mapper: s/getsize/getsz/ 2016-12-14 10:54:27 +01:00
log-writes.txt block, drivers, fs: rename REQ_FLUSH to REQ_PREFLUSH 2016-06-07 13:41:38 -06:00
persistent-data.txt Documentation: Fix multiple typo in Documentation 2012-03-07 16:08:24 +01:00
snapshot.txt dm snapshot: add new persistent store option to support overflow 2015-10-09 16:57:03 -04:00
statistics.txt dm stats: fix spelling mistake in Documentation 2016-05-05 15:25:54 -04:00
striped.txt Documentation/device-mapper: s/getsize/getsz/ 2016-12-14 10:54:27 +01:00
switch.txt Documentation/device-mapper: s/getsize/getsz/ 2016-12-14 10:54:27 +01:00
thin-provisioning.txt dm thin: display 'needs_check' in status if it is set 2015-07-16 10:23:50 -04:00
verity.txt dm verity: add ignore_zero_blocks feature 2015-12-10 10:39:03 -05:00
zero.txt