For BIO based DM, some targets aren't ready for dealing with bigger
incoming bio than 1Mbyte, such as crypt target.
Cc: Mike Snitzer <snit...@redhat.com>
Cc:dm-de...@redhat.com
Reviewed-by: Christoph Hellwig <h...@lst.de>
Signed-off-by: Ming Lei <ming....@redhat.com>
---
drivers/md/dm.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index de17b7193299..7475739fee49 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -920,7 +920,15 @@ int dm_set_target_max_io_len(struct dm_target *ti,
sector_t len)
return -EINVAL;
}
- ti->max_io_len = (uint32_t) len;
+ /*
+ * BIO based queue uses its own splitting. When multipage bvecs
+ * is switched on, size of the incoming bio may be too big to
+ * be handled in some targets, such as crypt.
+ *
+ * When these targets are ready for the big bio, we can remove
+ * the limit.
+ */
+ ti->max_io_len = min_t(uint32_t, len, BIO_MAX_PAGES * PAGE_SIZE);
return 0;
}
--
2.9.5
