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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>
This commit is contained in:
Lars Ellenberg 2010-11-11 10:47:05 +01:00 committed by Philipp Reisner
parent 470be44ab1
commit 3129b1b9ae
1 changed files with 5 additions and 2 deletions
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7
drivers/block/drbd/drbd_nl.c
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@ -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 */