Btrfs: Implement basic support for -ENOSPC

This is intended to prevent accidentally filling the drive.  A determined
user can still make things oops.

It includes some accounting of the current bytes under delayed allocation,
but this will change as things get optimized

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

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 6e572d3e892..ea60f5447b5 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -115,7 +115,8 @@ int __init extent_map_init(void);
 void extent_map_exit(void);
 
 u64 count_range_bits(struct extent_map_tree *tree,
-                     u64 *start, u64 max_bytes, unsigned long bits);
+                     u64 *start, u64 search_end,
+                     u64 max_bytes, unsigned long bits);
 
 int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
                    int bits, int filled);