drbd: debug: limit nelink-broadcast of request on digest mismatch to 32k

We used to be limited to 32k requests,
but have increased that limit to 128k now.

This part of the code can only deal with 32k,
it would scramble arbitrary pages for larger requests.

As it is used for debugging only anyways,
it is ok to simply truncate the dumped data here.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 8cbfaa687d72..dad559810ed6 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -2398,10 +2398,11 @@ void drbd_bcast_ee(struct drbd_conf *mdev,
         tl = tl_add_int(tl, T_ee_sector, &e->sector);
         tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
 
+        /* dump the first 32k */
+        len = min_t(unsigned, e->size, 32 << 10);
         put_unaligned(T_ee_data, tl++);
-        put_unaligned(e->size, tl++);
+        put_unaligned(len, tl++);
 
-        len = e->size;
         page = e->pages;
         page_chain_for_each(page) {
                 void *d = kmap_atomic(page, KM_USER0);
@@ -2410,6 +2411,8 @@ void drbd_bcast_ee(struct drbd_conf *mdev,
                 kunmap_atomic(d, KM_USER0);
                 tl = (unsigned short*)((char*)tl + l);
                 len -= l;
+                if (len == 0)
+                        break;
         }
         put_unaligned(TT_END, tl++); /* Close the tag list */