diff options
| author | Philipp Reisner <philipp.reisner@linbit.com> | 2016-06-14 00:26:14 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-06-13 21:43:04 -0600 |
| commit | a5ca66c419410b4a26ab47b120d5424bd1d33700 (patch) | |
| tree | e8bcf9de1ec9ec9b51f2863c3e1ab9a7286d33ef /include/linux/drbd_limits.h | |
| parent | 700ca8c04a0f4402f379055eec97351e0d6c0087 (diff) | |
drbd: Introduce new disk config option rs-discard-granularity
As long as the value is 0 the feature is disabled. With setting
it to a positive value, DRBD limits and aligns its resync requests
to the rs-discard-granularity setting. If the sync source detects
all zeros in such a block, the resync target discards the range
on disk.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/drbd_limits.h')
| -rw-r--r-- | include/linux/drbd_limits.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h index 8ac8c5d9a3ad..2e4aad8d8ae8 100644 --- a/include/linux/drbd_limits.h +++ b/include/linux/drbd_limits.h @@ -230,4 +230,10 @@ #define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX #define DRBD_SOCKET_CHECK_TIMEO_DEF 0 #define DRBD_SOCKET_CHECK_TIMEO_SCALE '1' + +#define DRBD_RS_DISCARD_GRANULARITY_MIN 0 +#define DRBD_RS_DISCARD_GRANULARITY_MAX (1<<20) /* 1MiByte */ +#define DRBD_RS_DISCARD_GRANULARITY_DEF 0 /* disabled by default */ +#define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */ + #endif |