nfs4.1: prevent race that allowed use of freed layout in _pnfs_return_layout
mark_matching_lsegs_invalid could put the last ref to the layout, so
the get_layout_hdr needs to be called first.
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 8f95822..730d4db 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -640,10 +640,10 @@
return status;
}
stateid = nfsi->layout->plh_stateid;
- mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
- lo->plh_block_lgets++;
/* Reference matched in nfs4_layoutreturn_release */
get_layout_hdr(lo);
+ mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
+ lo->plh_block_lgets++;
spin_unlock(&ino->i_lock);
pnfs_free_lseg_list(&tmp_list);