Btrfs: Change st_blocksize to 4k

Some programs (python) do rwm cycles at the granularity returned by
stat.

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

2 files changed, 9 insertions, 2 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 6e2d03626fb9..6d0cd9a7a615 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2701,7 +2701,7 @@ static int btrfs_getattr(struct vfsmount *mnt,
 {
         struct inode *inode = dentry->d_inode;
         generic_fillattr(inode, stat);
-        stat->blksize = 256 * 1024;
+        stat->blksize = PAGE_CACHE_SIZE;
         return 0;
 }
 
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index e2b9b86af696..08f19ec88092 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -75,7 +75,14 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
         ret = btrfs_search_slot(trans, root, key, path, 0, 1);
         if (ret < 0)
                 goto out;
-        BUG_ON(ret != 0);
+
+        if (ret != 0) {
+                btrfs_print_leaf(root, path->nodes[0]);
+                printk("unable to update root key %Lu %u %Lu\n",
+                       key->objectid, key->type, key->offset);
+                BUG_ON(1);
+        }
+
         l = path->nodes[0];
         slot = path->slots[0];
         ptr = btrfs_item_ptr_offset(l, slot);