tree 0b9240c0fb33d6adf4ddcfd85afd95321cc96552
parent c4d4c91b44d8309082127893221a1971a27c50ca
author Song Liu <songliubraving@fb.com> 1439501515 -0700
committer NeilBrown <neilb@suse.com> 1445667378 +1100

MD: add a new disk role to present write journal device

Next patches will use a disk as raid5/6 journaling. We need a new disk
role to present the journal device and add MD_FEATURE_JOURNAL to
feature_map for backward compability.

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