md: add raid4/5/6 journal mode switching API

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Commit 2ded370373 ("md/r5cache: State machine for raid5-cache write
back mode") added support for "write-back" caching on the raid journal
device.

In order to allow the dm-raid target to switch between the available
"write-through" and "write-back" modes, provide a new
r5c_journal_mode_set() API.

Use the new API in existing r5c_journal_mode_store()

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Acked-by: Shaohua Li <shli@fb.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

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Heinz Mauelshagen 2017-03-22 17:44:37 +01:00 • committed by Mike Snitzer

parent ff3af92b44

commit 78e470c26f

2 changed files with 45 additions and 28 deletions

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62

drivers/md/raid5-cache.c

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11

drivers/md/raid5.h

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