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drbd: announce FLUSH/FUA capability to upper layers

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Unconditionally announce FLUSH/FUA to upper layers.
If the lower layers on either node do not actually support this,
generic_make_request() will deal with it.

If this causes performance regressions on your setup,
make sure there are no volatile caches involved,
and mount -o nobarrier or equivalent.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg
2012-06-25 19:15:38 +02:00
committed by Philipp Reisner
parent db141b2f42
commit a73ff3231d
4 changed files with 23 additions and 8 deletions
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6
drivers/block/drbd/drbd_actlog.c
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@@ -876,7 +876,11 @@ int __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, int size,
unsigned int enr, count = 0;
struct lc_element *e;
if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) {
/* this should be an empty REQ_FLUSH */
if (size == 0)
return 0;
if (size < 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) {
dev_err(DEV, "sector: %llus, size: %d\n",
(unsigned long long)sector, size);
return 0;