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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>
This commit is contained in:
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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11
drivers/md/raid5.h
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@@ -547,6 +547,16 @@ 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
@@ -795,4 +805,5 @@ extern void r5c_check_cached_full_stripe(struct r5conf *conf);
extern struct md_sysfs_entry r5c_journal_mode;
extern void r5c_update_on_rdev_error(struct mddev *mddev);
extern bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect);
extern int r5c_journal_mode_set(struct mddev *mddev, int journal_mode);
#endif