diff options
Diffstat (limited to 'drivers/md/raid5.h')
| -rw-r--r-- | drivers/md/raid5.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 625c7f16fd6b..f6536399677a 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -510,6 +510,16 @@ struct r5worker_group { int stripes_cnt; }; +/* + * r5c journal modes of the array: write-back or write-through. + * write-through mode has identical behavior as existing log only + * implementation. + */ +enum r5c_journal_mode { + R5C_JOURNAL_MODE_WRITE_THROUGH = 0, + R5C_JOURNAL_MODE_WRITE_BACK = 1, +}; + enum r5_cache_state { R5_INACTIVE_BLOCKED, /* release of inactive stripes blocked, * waiting for 25% to be free @@ -741,4 +751,5 @@ extern struct stripe_head * raid5_get_active_stripe(struct r5conf *conf, sector_t sector, int previous, int noblock, int noquiesce); extern int raid5_calc_degraded(struct r5conf *conf); +extern int r5c_journal_mode_set(struct mddev *mddev, int journal_mode); #endif |