The flag was introduced for local case: if we modify local
block-device directly, bypassing ext4, we cannot rely on
fsync() and must flush the device explicitly. It is not the
case for pio_nfs, so it's not necessary to set
PLOOP_REQ_ISSUE_FLUSH.
The patch is important because pio_nfs doesn't provide
issue_flush method.
Signed-off-by: Maxim Patlasov <mpatla...@virtuozzo.com>
---
drivers/block/ploop/map.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/block/ploop/map.c b/drivers/block/ploop/map.c
index 715dc15..154a897 100644
--- a/drivers/block/ploop/map.c
+++ b/drivers/block/ploop/map.c
@@ -1113,9 +1113,11 @@ static void map_wb_complete_post_process(struct
ploop_map *map,
* (see dio_submit()). So fsync of EXT4 image doesnt help us.
* We need to force sync of nullified blocks.
*/
- preq->eng_io = &top_delta->io;
+ if (top_delta->io.ops->issue_flush) {
+ preq->eng_io = &top_delta->io;
+ set_bit(PLOOP_REQ_ISSUE_FLUSH, &preq->state);
+ }
BUG_ON(test_bit(PLOOP_REQ_POST_SUBMIT, &preq->state));
- set_bit(PLOOP_REQ_ISSUE_FLUSH, &preq->state);
top_delta->io.ops->submit(&top_delta->io, preq, preq->req_rw,
&sbl, preq->iblock, 1<<plo->cluster_log);
}
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