From: Sage Weil <sage@redhat.com>
Date: Fri, 8 Jan 2016 17:26:05 +0000 (-0500)
Subject: os/bluestore: pad trailing zeros for WAL write past eof
X-Git-Tag: v10.0.3~88^2~2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=8480ede414c742b8f5b456d31e912dfdafe761d5;p=ceph.git

os/bluestore: pad trailing zeros for WAL write past eof

If we're past EOF, we need to zero the rest of the block.

Signed-off-by: Sage Weil <sage@redhat.com>
---

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 915a9086dedb..a99fda36eeb7 100644
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -5117,6 +5117,10 @@ int BlueStore::_do_write(
     if (offset + length == orig_offset + orig_length && cow_rmw_tail) {
       op->src_rmw_tail = cow_rmw_tail;
       dout(20) << __func__ << " src_rmw_tail " << op->src_rmw_tail << dendl;
+    } else if (((offset + length) & ~block_mask) &&
+	       offset + length > o->onode.size) {
+      dout(20) << __func__ << " past eof, padding out tail block" << dendl;
+      _pad_zeros_tail(o, &bl, offset, &length, block_size);
     }
     bp->second.clear_flag(bluestore_extent_t::FLAG_COW_HEAD);
     bp->second.clear_flag(bluestore_extent_t::FLAG_COW_TAIL);