btrfs: print-tree: pass const extent buffer pointer

Since print-tree infrastructure only prints the content of a tree block,
we can make them to accept const extent buffer pointer.

This removes a forced type convert in extent-tree, where we convert a
const extent buffer pointer to regular one, just to avoid compiler
warning.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.c

@@ -3077,7 +3077,7 @@ static noinline int split_node(struct btrfs_trans_handle *trans,
  * and nr indicate which items in the leaf to check.  This totals up the
  * space used both by the item structs and the item data
  */
-static int leaf_space_used(struct extent_buffer *l, int start, int nr)
+static int leaf_space_used(const struct extent_buffer *l, int start, int nr)
 {
 	int data_len;
 	int nritems = btrfs_header_nritems(l);
@@ -3097,7 +3097,7 @@ static int leaf_space_used(struct extent_buffer *l, int start, int nr)
  * the start of the leaf data.  IOW, how much room
  * the leaf has left for both items and data
  */
-noinline int btrfs_leaf_free_space(struct extent_buffer *leaf)
+int btrfs_leaf_free_space(const struct extent_buffer *leaf)
 {
 	struct btrfs_fs_info *fs_info = leaf->fs_info;
 	int nritems = btrfs_header_nritems(leaf);

fs/btrfs/ctree.h

@@ -685,7 +685,7 @@ static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
 {
 	return btrfs_next_old_item(root, p, 0);
 }
-int btrfs_leaf_free_space(struct extent_buffer *leaf);
+int btrfs_leaf_free_space(const struct extent_buffer *leaf);
 
 static inline int is_fstree(u64 rootid)
 {

fs/btrfs/extent-tree.c

@@ -402,7 +402,7 @@ int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
 		}
 	}
 
-	btrfs_print_leaf((struct extent_buffer *)eb);
+	btrfs_print_leaf(eb);
 	btrfs_err(eb->fs_info,
 		  "eb %llu iref 0x%lx invalid extent inline ref type %d",
 		  eb->start, (unsigned long)iref, type);

fs/btrfs/print-tree.c

@@ -49,7 +49,7 @@ const char *btrfs_root_name(const struct btrfs_key *key, char *buf)
 	return buf;
 }
 
-static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
+static void print_chunk(const struct extent_buffer *eb, struct btrfs_chunk *chunk)
 {
 	int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
 	int i;
@@ -62,7 +62,7 @@ static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
 		      btrfs_stripe_offset_nr(eb, chunk, i));
 	}
 }
-static void print_dev_item(struct extent_buffer *eb,
+static void print_dev_item(const struct extent_buffer *eb,
 			   struct btrfs_dev_item *dev_item)
 {
 	pr_info("\t\tdev item devid %llu total_bytes %llu bytes used %llu\n",
@@ -70,7 +70,7 @@ static void print_dev_item(struct extent_buffer *eb,
 	       btrfs_device_total_bytes(eb, dev_item),
 	       btrfs_device_bytes_used(eb, dev_item));
 }
-static void print_extent_data_ref(struct extent_buffer *eb,
+static void print_extent_data_ref(const struct extent_buffer *eb,
 				  struct btrfs_extent_data_ref *ref)
 {
 	pr_cont("extent data backref root %llu objectid %llu offset %llu count %u\n",
@@ -80,7 +80,7 @@ static void print_extent_data_ref(struct extent_buffer *eb,
 	       btrfs_extent_data_ref_count(eb, ref));
 }
 
-static void print_extent_item(struct extent_buffer *eb, int slot, int type)
+static void print_extent_item(const struct extent_buffer *eb, int slot, int type)
 {
 	struct btrfs_extent_item *ei;
 	struct btrfs_extent_inline_ref *iref;
@@ -169,7 +169,7 @@ static void print_extent_item(struct extent_buffer *eb, int slot, int type)
 	WARN_ON(ptr > end);
 }
 
-static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
+static void print_uuid_item(const struct extent_buffer *l, unsigned long offset,
 			    u32 item_size)
 {
 	if (!IS_ALIGNED(item_size, sizeof(u64))) {
@@ -191,7 +191,7 @@ static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
  * Helper to output refs and locking status of extent buffer.  Useful to debug
  * race condition related problems.
  */
-static void print_eb_refs_lock(struct extent_buffer *eb)
+static void print_eb_refs_lock(const struct extent_buffer *eb)
 {
 #ifdef CONFIG_BTRFS_DEBUG
 	btrfs_info(eb->fs_info, "refs %u lock_owner %u current %u",
@@ -199,7 +199,7 @@ static void print_eb_refs_lock(struct extent_buffer *eb)
 #endif
 }
 
-void btrfs_print_leaf(struct extent_buffer *l)
+void btrfs_print_leaf(const struct extent_buffer *l)
 {
 	struct btrfs_fs_info *fs_info;
 	int i;
@@ -355,7 +355,7 @@ void btrfs_print_leaf(struct extent_buffer *l)
 	}
 }
 
-void btrfs_print_tree(struct extent_buffer *c, bool follow)
+void btrfs_print_tree(const struct extent_buffer *c, bool follow)
 {
 	struct btrfs_fs_info *fs_info;
 	int i; u32 nr;

fs/btrfs/print-tree.h

@@ -9,8 +9,8 @@
 /* Buffer size to contain tree name and possibly additional data (offset) */
 #define BTRFS_ROOT_NAME_BUF_LEN				48
 
-void btrfs_print_leaf(struct extent_buffer *l);
-void btrfs_print_tree(struct extent_buffer *c, bool follow);
+void btrfs_print_leaf(const struct extent_buffer *l);
+void btrfs_print_tree(const struct extent_buffer *c, bool follow);
 const char *btrfs_root_name(const struct btrfs_key *key, char *buf);
 
 #endif