pNFS: Fix a memory leak when attempted pnfs fails

pnfs_do_write() expects the call to pnfs_write_through_mds() to free the
pgio header and to release the layout segment before exiting. The problem
is that nfs_pgio_data_destroy() doesn't actually do this; it only frees
the memory allocated by nfs_generic_pgio().

Ditto for pnfs_do_read()...

Fix in both cases is to add a call to hdr->release(hdr).

Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 230606243be6..219ee6a3f1b3 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1865,6 +1865,7 @@ pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
                 mirror->pg_recoalesce = 1;
         }
         nfs_pgio_data_destroy(hdr);
+        hdr->release(hdr);
 }
 
 static enum pnfs_try_status
@@ -1979,6 +1980,7 @@ pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
                 mirror->pg_recoalesce = 1;
         }
         nfs_pgio_data_destroy(hdr);
+        hdr->release(hdr);
 }
 
 /*