btrfs: move accessor helpers into accessors.h

This is a large patch, but because they're all macros it's impossible to
split up.  Simply copy all of the item accessors in ctree.h and paste
them in accessors.h, and then update any files to include the header so
everything compiles.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ reformat comments, style fixups ]
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/backref.c

@@ -16,6 +16,7 @@
 #include "misc.h"
 #include "tree-mod-log.h"
 #include "fs.h"
+#include "accessors.h"
 
 /* Just arbitrary numbers so we can be sure one of these happened. */
 #define BACKREF_FOUND_SHARED     6

fs/btrfs/block-group.c

@@ -18,6 +18,7 @@
 #include "raid56.h"
 #include "zoned.h"
 #include "fs.h"
+#include "accessors.h"
 
 #ifdef CONFIG_BTRFS_DEBUG
 int btrfs_should_fragment_free_space(struct btrfs_block_group *block_group)

fs/btrfs/block-rsv.c

@@ -8,6 +8,7 @@
 #include "block-group.h"
 #include "disk-io.h"
 #include "fs.h"
+#include "accessors.h"
 
 /*
  * HOW DO BLOCK RESERVES WORK

fs/btrfs/check-integrity.c

@@ -93,6 +93,7 @@
 #include "check-integrity.h"
 #include "rcu-string.h"
 #include "compression.h"
+#include "accessors.h"
 
 #define BTRFSIC_BLOCK_HASHTABLE_SIZE 0x10000
 #define BTRFSIC_BLOCK_LINK_HASHTABLE_SIZE 0x10000

fs/btrfs/delayed-inode.c

@@ -17,6 +17,7 @@
 #include "locking.h"
 #include "inode-item.h"
 #include "space-info.h"
+#include "accessors.h"
 
 #define BTRFS_DELAYED_WRITEBACK		512
 #define BTRFS_DELAYED_BACKGROUND	128

fs/btrfs/dev-replace.c

@@ -24,6 +24,7 @@
 #include "zoned.h"
 #include "block-group.h"
 #include "fs.h"
+#include "accessors.h"
 
 /*
  * Device replace overview

fs/btrfs/dir-item.c

@@ -7,6 +7,7 @@
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
+#include "accessors.h"
 
 /*
  * insert a name into a directory, doing overflow properly if there is a hash

fs/btrfs/disk-io.c

@@ -44,6 +44,7 @@
 #include "zoned.h"
 #include "subpage.h"
 #include "fs.h"
+#include "accessors.h"
 
 #define BTRFS_SUPER_FLAG_SUPP	(BTRFS_HEADER_FLAG_WRITTEN |\
 				 BTRFS_HEADER_FLAG_RELOC |\

fs/btrfs/export.c

@@ -7,6 +7,7 @@
 #include "btrfs_inode.h"
 #include "print-tree.h"
 #include "export.h"
+#include "accessors.h"
 
 #define BTRFS_FID_SIZE_NON_CONNECTABLE (offsetof(struct btrfs_fid, \
 						 parent_objectid) / 4)

fs/btrfs/extent-tree.c

@@ -37,6 +37,7 @@
 #include "zoned.h"
 #include "dev-replace.h"
 #include "fs.h"
+#include "accessors.h"
 
 #undef SCRAMBLE_DELAYED_REFS
 

fs/btrfs/extent_io.c

@@ -31,6 +31,7 @@
 #include "block-group.h"
 #include "compression.h"
 #include "fs.h"
+#include "accessors.h"
 
 static struct kmem_cache *extent_buffer_cache;
 

fs/btrfs/file-item.c

@@ -18,6 +18,7 @@
 #include "print-tree.h"
 #include "compression.h"
 #include "fs.h"
+#include "accessors.h"
 
 #define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((BTRFS_LEAF_DATA_SIZE(r) - \
 				   sizeof(struct btrfs_item) * 2) / \

fs/btrfs/file.c

@@ -31,6 +31,7 @@
 #include "reflink.h"
 #include "subpage.h"
 #include "fs.h"
+#include "accessors.h"
 
 static struct kmem_cache *btrfs_inode_defrag_cachep;
 /*

fs/btrfs/free-space-cache.c

@@ -26,6 +26,7 @@
 #include "discard.h"
 #include "subpage.h"
 #include "inode-item.h"
+#include "accessors.h"
 
 #define BITS_PER_BITMAP		(PAGE_SIZE * 8UL)
 #define MAX_CACHE_BYTES_PER_GIG	SZ_64K

fs/btrfs/free-space-tree.c

@@ -13,6 +13,7 @@
 #include "transaction.h"
 #include "block-group.h"
 #include "fs.h"
+#include "accessors.h"
 
 static int __add_block_group_free_space(struct btrfs_trans_handle *trans,
 					struct btrfs_block_group *block_group,

fs/btrfs/fs.c

@@ -3,6 +3,7 @@
 #include "messages.h"
 #include "ctree.h"
 #include "fs.h"
+#include "accessors.h"
 
 void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
 			     const char *name)

fs/btrfs/inode-item.c

@@ -11,6 +11,7 @@
 #include "transaction.h"
 #include "print-tree.h"
 #include "space-info.h"
+#include "accessors.h"
 
 struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
 						   int slot, const char *name,

fs/btrfs/ioctl.c

@@ -51,6 +51,7 @@
 #include "block-group.h"
 #include "subpage.h"
 #include "fs.h"
+#include "accessors.h"
 
 #ifdef CONFIG_64BIT
 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI