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| author | Heinz Mauelshagen <heinzm@redhat.com> | 2017-03-22 17:44:37 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2017-03-27 17:13:47 +0200 |
| commit | 78e470c26f524f4706c2555613b9641d85190cbe (patch) | |
| tree | dfc665acd9116cb93a2c11809758c13352950b62 /drivers/md/raid5.h | |
| parent | dm crypt: use shifts instead of sector_div (diff) | |
| download | linux-78e470c26f524f4706c2555613b9641d85190cbe.tar.xz linux-78e470c26f524f4706c2555613b9641d85190cbe.zip | |
md: add raid4/5/6 journal mode switching API
Commit 2ded370373a4 ("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>
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 4bb27b97bf6b..ec8ca15774d7 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -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 |