diff options
| author |   Lars Ellenberg <lars.ellenberg@linbit.com> | 2017-08-29 10:20:38 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2017-08-29 15:34:44 -0600 |
| commit | 9de7e14a1a9c6bc4f9be6ccd9b951341a80dbd52 (patch) | |
| tree | 5255e73d42a6d601041f1e82056b02da77fe9c8a /include/linux/drbd_limits.h | |
| parent | drbd: Fix resource role for newly created resources in events2 (diff) | |
| download | linux-dev-9de7e14a1a9c6bc4f9be6ccd9b951341a80dbd52.tar.xz linux-dev-9de7e14a1a9c6bc4f9be6ccd9b951341a80dbd52.zip | |
drbd: new disk-option disable-write-same
Some backend devices claim to support write-same,
but would fail actual write-same requests.
Allow to set (or toggle) whether or not DRBD tries to support write-same.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/drbd_limits.h')
| -rw-r--r-- | include/linux/drbd_limits.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h index ddac68422a96..24ae1b9b76c7 100644 --- a/include/linux/drbd_limits.h +++ b/include/linux/drbd_limits.h @@ -209,12 +209,18 @@ #define DRBD_MD_FLUSHES_DEF 1 #define DRBD_TCP_CORK_DEF 1 #define DRBD_AL_UPDATES_DEF 1 + /* We used to ignore the discard_zeroes_data setting. * To not change established (and expected) behaviour, * by default assume that, for discard_zeroes_data=0, * we can make that an effective discard_zeroes_data=1, * if we only explicitly zero-out unaligned partial chunks. */ -#define DRBD_DISCARD_ZEROES_IF_ALIGNED 1 +#define DRBD_DISCARD_ZEROES_IF_ALIGNED_DEF 1 + +/* Some backends pretend to support WRITE SAME, + * but fail such requests when they are actually submitted. + * This is to tell DRBD to not even try. */ +#define DRBD_DISABLE_WRITE_SAME_DEF 0 #define DRBD_ALLOW_TWO_PRIMARIES_DEF 0 #define DRBD_ALWAYS_ASBP_DEF 0 |