btrfs: unexport internal failrec functions

These are internally used functions and are not used outside of
extent_io.c.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-io-tree.h

@@ -248,14 +248,8 @@ bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start,
 			       struct extent_state **cached_state);
 
 /* This should be reworked in the future and put elsewhere. */
-struct io_failure_record *get_state_failrec(struct extent_io_tree *tree, u64 start);
-int set_state_failrec(struct extent_io_tree *tree, u64 start,
-		      struct io_failure_record *failrec);
 void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start,
 		u64 end);
-int free_io_failure(struct extent_io_tree *failure_tree,
-		    struct extent_io_tree *io_tree,
-		    struct io_failure_record *rec);
 int btrfs_clean_io_failure(struct btrfs_inode *inode, u64 start,
 			   struct page *page, unsigned int pg_offset);
 

fs/btrfs/extent_io.c

@@ -2163,7 +2163,7 @@ u64 count_range_bits(struct extent_io_tree *tree,
  * set the private field for a given byte offset in the tree.  If there isn't
  * an extent_state there already, this does nothing.
  */
-int set_state_failrec(struct extent_io_tree *tree, u64 start,
+static int set_state_failrec(struct extent_io_tree *tree, u64 start,
 			     struct io_failure_record *failrec)
 {
 	struct rb_node *node;
@@ -2191,7 +2191,8 @@ int set_state_failrec(struct extent_io_tree *tree, u64 start,
 	return ret;
 }
 
-struct io_failure_record *get_state_failrec(struct extent_io_tree *tree, u64 start)
+static struct io_failure_record *get_state_failrec(struct extent_io_tree *tree,
+						   u64 start)
 {
 	struct rb_node *node;
 	struct extent_state *state;
@@ -2275,7 +2276,7 @@ int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 	return bitset;
 }
 
-int free_io_failure(struct extent_io_tree *failure_tree,
+static int free_io_failure(struct extent_io_tree *failure_tree,
 			   struct extent_io_tree *io_tree,
 			   struct io_failure_record *rec)
 {