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>

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 8cbfaa687d723152b27955cfbc4a43c1af858121..dad559810ed6234dc2044ffd5dd97c12ea20ed2a 100644 (file)
--- 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 */