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>
Signed-off-by: Ming Lei <ming....@redhat.com>
drivers/md/dm.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 2edbcc2d7d3f..631348699fb8 100644
@@ -922,7 +922,16 @@ int dm_set_target_max_io_len(struct dm_target *ti,
- 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));