md/r5cache: handle FLUSH and FUA

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With raid5 cache, we committing data from journal device. When
there is flush request, we need to flush journal device's cache.
This was not needed in raid5 journal, because we will flush the
journal before committing data to raid disks.

This is similar to FUA, except that we also need flush journal for
FUA. Otherwise, corruptions in earlier meta data will stop recovery
from reaching FUA data.

slightly changed the code by Shaohua

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>

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Song Liu 2016-11-18 16:46:50 -08:00 • committed by Shaohua Li

parent 5aabf7c49d

commit 3bddb7f8f2

3 changed files with 157 additions and 18 deletions

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162

drivers/md/raid5-cache.c

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12

drivers/md/raid5.c

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1

drivers/md/raid5.h

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