Subject: Rework btrfs_file_write to only allocate while page locks are held

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 602b63dc76c3..15cc9ec92308 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -541,6 +541,8 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
         else
                 ret = submit_bh(WRITE, bh);
         if (ret == -EOPNOTSUPP) {
+                get_bh(bh);
+                lock_buffer(bh);
                 set_buffer_uptodate(bh);
                 root->fs_info->do_barriers = 0;
                 ret = submit_bh(WRITE, bh);