diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index d0864041c229..7a1858267506 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -413,12 +413,12 @@ static inline void btrfs_i_size_write(struct btrfs_inode *inode, u64 size)
 	inode->disk_i_size = size;
 }
 
-static inline bool btrfs_is_free_space_inode(struct btrfs_inode *inode)
+static inline bool btrfs_is_free_space_inode(const struct btrfs_inode *inode)
 {
 	return test_bit(BTRFS_INODE_FREE_SPACE_INODE, &inode->runtime_flags);
 }
 
-static inline bool is_data_inode(struct inode *inode)
+static inline bool is_data_inode(const struct inode *inode)
 {
 	return btrfs_ino(BTRFS_I(inode)) != BTRFS_BTREE_INODE_OBJECTID;
 }
diff --git a/fs/btrfs/delalloc-space.c b/fs/btrfs/delalloc-space.c
index b3527efd0b4b..7aa8a395d838 100644
--- a/fs/btrfs/delalloc-space.c
+++ b/fs/btrfs/delalloc-space.c
@@ -111,7 +111,7 @@
  *  making error handling and cleanup easier.
  */
 
-int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes)
+int btrfs_alloc_data_chunk_ondemand(const struct btrfs_inode *inode, u64 bytes)
 {
 	struct btrfs_root *root = inode->root;
 	struct btrfs_fs_info *fs_info = root->fs_info;
diff --git a/fs/btrfs/delalloc-space.h b/fs/btrfs/delalloc-space.h
index ce4f889e4f17..3f32953c0a80 100644
--- a/fs/btrfs/delalloc-space.h
+++ b/fs/btrfs/delalloc-space.h
@@ -9,7 +9,7 @@ struct extent_changeset;
 struct btrfs_inode;
 struct btrfs_fs_info;
 
-int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes);
+int btrfs_alloc_data_chunk_ondemand(const struct btrfs_inode *inode, u64 bytes);
 int btrfs_check_data_free_space(struct btrfs_inode *inode,
 			struct extent_changeset **reserved, u64 start, u64 len,
 			bool noflush);
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index 483c141dc488..7b8b1bd0ca39 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1469,7 +1469,7 @@ static void btrfs_release_dir_index_item_space(struct btrfs_trans_handle *trans)
 int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
 				   const char *name, int name_len,
 				   struct btrfs_inode *dir,
-				   struct btrfs_disk_key *disk_key, u8 flags,
+				   const struct btrfs_disk_key *disk_key, u8 flags,
 				   u64 index)
 {
 	struct btrfs_fs_info *fs_info = trans->fs_info;
@@ -1755,7 +1755,7 @@ void btrfs_readdir_put_delayed_items(struct inode *inode,
 	downgrade_write(&inode->i_rwsem);
 }
 
-int btrfs_should_delete_dir_index(struct list_head *del_list,
+int btrfs_should_delete_dir_index(const struct list_head *del_list,
 				  u64 index)
 {
 	struct btrfs_delayed_item *curr;
@@ -1776,7 +1776,7 @@ int btrfs_should_delete_dir_index(struct list_head *del_list,
  * Read dir info stored in the delayed tree.
  */
 int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
-				    struct list_head *ins_list)
+				    const struct list_head *ins_list)
 {
 	struct btrfs_dir_item *di;
 	struct btrfs_delayed_item *curr, *next;
diff --git a/fs/btrfs/delayed-inode.h b/fs/btrfs/delayed-inode.h
index 64e115d97499..654c04d38fb3 100644
--- a/fs/btrfs/delayed-inode.h
+++ b/fs/btrfs/delayed-inode.h
@@ -110,7 +110,7 @@ void btrfs_init_delayed_root(struct btrfs_delayed_root *delayed_root);
 int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
 				   const char *name, int name_len,
 				   struct btrfs_inode *dir,
-				   struct btrfs_disk_key *disk_key, u8 flags,
+				   const struct btrfs_disk_key *disk_key, u8 flags,
 				   u64 index);
 
 int btrfs_delete_delayed_dir_index(struct btrfs_trans_handle *trans,
@@ -150,10 +150,10 @@ bool btrfs_readdir_get_delayed_items(struct inode *inode,
 void btrfs_readdir_put_delayed_items(struct inode *inode,
 				     struct list_head *ins_list,
 				     struct list_head *del_list);
-int btrfs_should_delete_dir_index(struct list_head *del_list,
+int btrfs_should_delete_dir_index(const struct list_head *del_list,
 				  u64 index);
 int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
-				    struct list_head *ins_list);
+				    const struct list_head *ins_list);
 
 /* Used during directory logging. */
 void btrfs_log_get_delayed_items(struct btrfs_inode *inode,
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 9c07d5c3e5ad..001c0c2f872c 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -22,7 +22,7 @@ static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle
 						   *trans,
 						   struct btrfs_root *root,
 						   struct btrfs_path *path,
-						   struct btrfs_key *cpu_key,
+						   const struct btrfs_key *cpu_key,
 						   u32 data_size,
 						   const char *name,
 						   int name_len)
@@ -108,7 +108,7 @@ int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
  */
 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
 			  const struct fscrypt_str *name, struct btrfs_inode *dir,
-			  struct btrfs_key *location, u8 type, u64 index)
+			  const struct btrfs_key *location, u8 type, u64 index)
 {
 	int ret = 0;
 	int ret2 = 0;
@@ -379,7 +379,7 @@ struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
  * for a specific name.
  */
 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
-						 struct btrfs_path *path,
+						 const struct btrfs_path *path,
 						 const char *name, int name_len)
 {
 	struct btrfs_dir_item *dir_item;
@@ -417,7 +417,7 @@ struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
 			      struct btrfs_root *root,
 			      struct btrfs_path *path,
-			      struct btrfs_dir_item *di)
+			      const struct btrfs_dir_item *di)
 {
 
 	struct extent_buffer *leaf;
diff --git a/fs/btrfs/dir-item.h b/fs/btrfs/dir-item.h
index 00b3d83d7569..5f6dfafc91f1 100644
--- a/fs/btrfs/dir-item.h
+++ b/fs/btrfs/dir-item.h
@@ -17,7 +17,7 @@ int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
 			  const struct fscrypt_str *name);
 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
 			  const struct fscrypt_str *name, struct btrfs_inode *dir,
-			  struct btrfs_key *location, u8 type, u64 index);
+			  const struct btrfs_key *location, u8 type, u64 index);
 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
 					     struct btrfs_root *root,
 					     struct btrfs_path *path, u64 dir,
@@ -33,7 +33,7 @@ struct btrfs_dir_item *btrfs_search_dir_index_item(struct btrfs_root *root,
 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
 			      struct btrfs_root *root,
 			      struct btrfs_path *path,
-			      struct btrfs_dir_item *di);
+			      const struct btrfs_dir_item *di);
 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
 			    struct btrfs_root *root,
 			    struct btrfs_path *path, u64 objectid,
@@ -45,7 +45,7 @@ struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
 					  const char *name, u16 name_len,
 					  int mod);
 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
-						 struct btrfs_path *path,
+						 const struct btrfs_path *path,
 						 const char *name,
 						 int name_len);
 
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b1daaaec0614..ffc9129e23d2 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -213,7 +213,7 @@ static int btrfs_repair_eb_io_failure(const struct extent_buffer *eb,
  *			structure for details.
  */
 int btrfs_read_extent_buffer(struct extent_buffer *eb,
-			     struct btrfs_tree_parent_check *check)
+			     const struct btrfs_tree_parent_check *check)
 {
 	struct btrfs_fs_info *fs_info = eb->fs_info;
 	int failed = 0;
@@ -358,7 +358,7 @@ static bool check_tree_block_fsid(struct extent_buffer *eb)
 
 /* Do basic extent buffer checks at read time */
 int btrfs_validate_extent_buffer(struct extent_buffer *eb,
-				 struct btrfs_tree_parent_check *check)
+				 const struct btrfs_tree_parent_check *check)
 {
 	struct btrfs_fs_info *fs_info = eb->fs_info;
 	u64 found_start;
@@ -425,7 +425,7 @@ int btrfs_validate_extent_buffer(struct extent_buffer *eb,
 		goto out;
 	}
 	if (check->has_first_key) {
-		struct btrfs_key *expect_key = &check->first_key;
+		const struct btrfs_key *expect_key = &check->first_key;
 		struct btrfs_key found_key;
 
 		if (found_level)
@@ -1025,7 +1025,7 @@ int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
 
 static struct btrfs_root *read_tree_root_path(struct btrfs_root *tree_root,
 					      struct btrfs_path *path,
-					      struct btrfs_key *key)
+					      const struct btrfs_key *key)
 {
 	struct btrfs_root *root;
 	struct btrfs_tree_parent_check check = { 0 };
@@ -1087,7 +1087,7 @@ fail:
 }
 
 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
-					struct btrfs_key *key)
+					const struct btrfs_key *key)
 {
 	struct btrfs_root *root;
 	struct btrfs_path *path;
@@ -1222,7 +1222,7 @@ int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
 	return ret;
 }
 
-void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info)
+void btrfs_check_leaked_roots(const struct btrfs_fs_info *fs_info)
 {
 #ifdef CONFIG_BTRFS_DEBUG
 	struct btrfs_root *root;
@@ -2339,8 +2339,8 @@ out:
  * 		1, 2	2nd and 3rd backup copy
  * 	       -1	skip bytenr check
  */
-int btrfs_validate_super(struct btrfs_fs_info *fs_info,
-			 struct btrfs_super_block *sb, int mirror_num)
+int btrfs_validate_super(const struct btrfs_fs_info *fs_info,
+			 const struct btrfs_super_block *sb, int mirror_num)
 {
 	u64 nodesize = btrfs_super_nodesize(sb);
 	u64 sectorsize = btrfs_super_sectorsize(sb);
@@ -3192,7 +3192,7 @@ int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount)
 }
 
 int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices,
-		      char *options)
+		      const char *options)
 {
 	u32 sectorsize;
 	u32 nodesize;
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 1f93feae1872..99af64d3f277 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -41,7 +41,7 @@ static inline u64 btrfs_sb_offset(int mirror)
 	return BTRFS_SUPER_INFO_OFFSET;
 }
 
-void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
+void btrfs_check_leaked_roots(const struct btrfs_fs_info *fs_info);
 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
 				      struct btrfs_tree_parent_check *check);
@@ -52,12 +52,11 @@ struct extent_buffer *btrfs_find_create_tree_block(
 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
 int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
 			   const struct btrfs_super_block *disk_sb);
-int __cold open_ctree(struct super_block *sb,
-	       struct btrfs_fs_devices *fs_devices,
-	       char *options);
+int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices,
+		      const char *options);
 void __cold close_ctree(struct btrfs_fs_info *fs_info);
-int btrfs_validate_super(struct btrfs_fs_info *fs_info,
-			 struct btrfs_super_block *sb, int mirror_num);
+int btrfs_validate_super(const struct btrfs_fs_info *fs_info,
+			 const struct btrfs_super_block *sb, int mirror_num);
 int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount);
 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
@@ -65,7 +64,7 @@ struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
 						   int copy_num, bool drop_cache);
 int btrfs_commit_super(struct btrfs_fs_info *fs_info);
 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
-					struct btrfs_key *key);
+					const struct btrfs_key *key);
 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
 			 struct btrfs_root *root);
 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
@@ -90,7 +89,7 @@ void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
 				 struct btrfs_root *root);
 int btrfs_validate_extent_buffer(struct extent_buffer *eb,
-				 struct btrfs_tree_parent_check *check);
+				 const struct btrfs_tree_parent_check *check);
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
 #endif
@@ -117,7 +116,7 @@ void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans,
 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
 			  int atomic);
 int btrfs_read_extent_buffer(struct extent_buffer *buf,
-			     struct btrfs_tree_parent_check *check);
+			     const struct btrfs_tree_parent_check *check);
 
 blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio);
 int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 689643956ea6..a8290631047c 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -180,7 +180,7 @@ void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end)
 }
 
 static void process_one_page(struct btrfs_fs_info *fs_info,
-			     struct page *page, struct page *locked_page,
+			     struct page *page, const struct page *locked_page,
 			     unsigned long page_ops, u64 start, u64 end)
 {
 	struct folio *folio = page_folio(page);
@@ -203,7 +203,7 @@ static void process_one_page(struct btrfs_fs_info *fs_info,
 }
 
 static void __process_pages_contig(struct address_space *mapping,
-				   struct page *locked_page, u64 start, u64 end,
+				   const struct page *locked_page, u64 start, u64 end,
 				   unsigned long page_ops)
 {
 	struct btrfs_fs_info *fs_info = inode_to_fs_info(mapping->host);
@@ -230,8 +230,8 @@ static void __process_pages_contig(struct address_space *mapping,
 	}
 }
 
-static noinline void __unlock_for_delalloc(struct inode *inode,
-					   struct page *locked_page,
+static noinline void __unlock_for_delalloc(const struct inode *inode,
+					   const struct page *locked_page,
 					   u64 start, u64 end)
 {
 	unsigned long index = start >> PAGE_SHIFT;
@@ -246,7 +246,7 @@ static noinline void __unlock_for_delalloc(struct inode *inode,
 }
 
 static noinline int lock_delalloc_pages(struct inode *inode,
-					struct page *locked_page,
+					const struct page *locked_page,
 					u64 start,
 					u64 end)
 {
@@ -411,7 +411,7 @@ out_failed:
 }
 
 void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
-				  struct page *locked_page,
+				  const struct page *locked_page,
 				  struct extent_state **cached,
 				  u32 clear_bits, unsigned long page_ops)
 {
@@ -1382,7 +1382,7 @@ out:
  * Return the next dirty range in [@start, @end).
  * If no dirty range is found, @start will be page_offset(page) + PAGE_SIZE.
  */
-static void find_next_dirty_byte(struct btrfs_fs_info *fs_info,
+static void find_next_dirty_byte(const struct btrfs_fs_info *fs_info,
 				 struct page *page, u64 *start, u64 *end)
 {
 	struct folio *folio = page_folio(page);
@@ -1743,7 +1743,7 @@ static void set_btree_ioerr(struct extent_buffer *eb)
  * context.
  */
 static struct extent_buffer *find_extent_buffer_nolock(
-		struct btrfs_fs_info *fs_info, u64 start)
+		const struct btrfs_fs_info *fs_info, u64 start)
 {
 	struct extent_buffer *eb;
 
@@ -2312,7 +2312,7 @@ retry:
  * already been ran (aka, ordered extent inserted) and all pages are still
  * locked.
  */
-void extent_write_locked_range(struct inode *inode, struct page *locked_page,
+void extent_write_locked_range(struct inode *inode, const struct page *locked_page,
 			       u64 start, u64 end, struct writeback_control *wbc,
 			       bool pages_dirty)
 {
@@ -2597,7 +2597,7 @@ static bool folio_range_has_eb(struct btrfs_fs_info *fs_info, struct folio *foli
 	return false;
 }
 
-static void detach_extent_buffer_folio(struct extent_buffer *eb, struct folio *folio)
+static void detach_extent_buffer_folio(const struct extent_buffer *eb, struct folio *folio)
 {
 	struct btrfs_fs_info *fs_info = eb->fs_info;
 	const bool mapped = !test_bit(EXTENT_BUFFER_UNMAPPED, &eb->bflags);
@@ -2658,7 +2658,7 @@ static void detach_extent_buffer_folio(struct extent_buffer *eb, struct folio *f
 }
 
 /* Release all pages attached to the extent buffer */
-static void btrfs_release_extent_buffer_pages(struct extent_buffer *eb)
+static void btrfs_release_extent_buffer_pages(const struct extent_buffer *eb)
 {
 	ASSERT(!extent_buffer_under_io(eb));
 
@@ -3575,7 +3575,7 @@ static void end_bbio_meta_read(struct btrfs_bio *bbio)
 }
 
 int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
-			     struct btrfs_tree_parent_check *check)
+			     const struct btrfs_tree_parent_check *check)
 {
 	struct btrfs_bio *bbio;
 	bool ret;
@@ -4188,7 +4188,7 @@ void memmove_extent_buffer(const struct extent_buffer *dst,
 
 #define GANG_LOOKUP_SIZE	16
 static struct extent_buffer *get_next_extent_buffer(
-		struct btrfs_fs_info *fs_info, struct page *page, u64 bytenr)
+		const struct btrfs_fs_info *fs_info, struct page *page, u64 bytenr)
 {
 	struct extent_buffer *gang[GANG_LOOKUP_SIZE];
 	struct extent_buffer *found = NULL;
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index ecf89424502e..96c6bbdcd5d6 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -235,7 +235,7 @@ bool try_release_extent_mapping(struct page *page, gfp_t mask);
 int try_release_extent_buffer(struct page *page);
 
 int btrfs_read_folio(struct file *file, struct folio *folio);
-void extent_write_locked_range(struct inode *inode, struct page *locked_page,
+void extent_write_locked_range(struct inode *inode, const struct page *locked_page,
 			       u64 start, u64 end, struct writeback_control *wbc,
 			       bool pages_dirty);
 int btrfs_writepages(struct address_space *mapping, struct writeback_control *wbc);
@@ -261,7 +261,7 @@ void free_extent_buffer_stale(struct extent_buffer *eb);
 #define WAIT_COMPLETE	1
 #define WAIT_PAGE_LOCK	2
 int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num,
-			     struct btrfs_tree_parent_check *parent_check);
+			     const struct btrfs_tree_parent_check *parent_check);
 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
 void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
 				u64 bytenr, u64 owner_root, u64 gen, int level);
@@ -350,7 +350,7 @@ void set_extent_buffer_uptodate(struct extent_buffer *eb);
 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
 void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
-				  struct page *locked_page,
+				  const struct page *locked_page,
 				  struct extent_state **cached,
 				  u32 bits_to_clear, unsigned long page_ops);
 int extent_invalidate_folio(struct extent_io_tree *tree,
diff --git a/fs/btrfs/fs.h b/fs/btrfs/fs.h
index e6b1903f6c32..18e0d3539496 100644
--- a/fs/btrfs/fs.h
+++ b/fs/btrfs/fs.h
@@ -956,7 +956,7 @@ static inline bool btrfs_is_zoned(const struct btrfs_fs_info *fs_info)
 /*
  * Count how many fs_info->max_extent_size cover the @size
  */
-static inline u32 count_max_extents(struct btrfs_fs_info *fs_info, u64 size)
+static inline u32 count_max_extents(const struct btrfs_fs_info *fs_info, u64 size)
 {
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 	if (!fs_info)
@@ -1017,7 +1017,7 @@ void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
 #define btrfs_test_opt(fs_info, opt)	((fs_info)->mount_opt & \
 					 BTRFS_MOUNT_##opt)
 
-static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
+static inline int btrfs_fs_closing(const struct btrfs_fs_info *fs_info)
 {
 	/* Do it this way so we only ever do one test_bit in the normal case. */
 	if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
@@ -1036,7 +1036,7 @@ static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
  * since setting and checking for SB_RDONLY in the superblock's flags is not
  * atomic.
  */
-static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
+static inline int btrfs_need_cleaner_sleep(const struct btrfs_fs_info *fs_info)
 {
 	return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
 		btrfs_fs_closing(fs_info);
@@ -1057,7 +1057,7 @@ static inline void btrfs_wake_unfinished_drop(struct btrfs_fs_info *fs_info)
 
 #define EXPORT_FOR_TESTS
 
-static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
+static inline int btrfs_is_testing(const struct btrfs_fs_info *fs_info)
 {
 	return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
 }
@@ -1068,7 +1068,7 @@ void btrfs_test_destroy_inode(struct inode *inode);
 
 #define EXPORT_FOR_TESTS static
 
-static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
+static inline int btrfs_is_testing(const struct btrfs_fs_info *fs_info)
 {
 	return 0;
 }
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 6e24cced6f0d..5e3cb0210869 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -552,7 +552,7 @@ static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
 	return 0;
 }
 
-int __pure btrfs_is_empty_uuid(u8 *uuid)
+int __pure btrfs_is_empty_uuid(const u8 *uuid)
 {
 	int i;
 
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 2c5dc25ec670..19cd26b0244a 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -19,7 +19,7 @@ int btrfs_fileattr_set(struct mnt_idmap *idmap,
 		       struct dentry *dentry, struct fileattr *fa);
 int btrfs_ioctl_get_supported_features(void __user *arg);
 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
-int __pure btrfs_is_empty_uuid(u8 *uuid);
+int __pure btrfs_is_empty_uuid(const u8 *uuid);
 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
 				     struct btrfs_ioctl_balance_args *bargs);
 
diff --git a/fs/btrfs/misc.h b/fs/btrfs/misc.h
index dde4904aead9..0d599fd847c9 100644
--- a/fs/btrfs/misc.h
+++ b/fs/btrfs/misc.h
@@ -66,7 +66,7 @@ struct rb_simple_node {
 	u64 bytenr;
 };
 
-static inline struct rb_node *rb_simple_search(struct rb_root *root, u64 bytenr)
+static inline struct rb_node *rb_simple_search(const struct rb_root *root, u64 bytenr)
 {
 	struct rb_node *node = root->rb_node;
 	struct rb_simple_node *entry;
@@ -93,7 +93,7 @@ static inline struct rb_node *rb_simple_search(struct rb_root *root, u64 bytenr)
  * Return the rb_node that start at or after @bytenr.  If there is no entry at
  * or after @bytner return NULL.
  */
-static inline struct rb_node *rb_simple_search_first(struct rb_root *root,
+static inline struct rb_node *rb_simple_search_first(const struct rb_root *root,
 						     u64 bytenr)
 {
 	struct rb_node *node = root->rb_node, *ret = NULL;
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index 155570e20f45..5c8e64eaf48b 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -27,7 +27,7 @@ struct prop_handler {
 	int (*validate)(const struct btrfs_inode *inode, const char *value,
 			size_t len);
 	int (*apply)(struct inode *inode, const char *value, size_t len);
-	const char *(*extract)(struct inode *inode);
+	const char *(*extract)(const struct inode *inode);
 	bool (*ignore)(const struct btrfs_inode *inode);
 	int inheritable;
 };
@@ -359,7 +359,7 @@ static bool prop_compression_ignore(const struct btrfs_inode *inode)
 	return false;
 }
 
-static const char *prop_compression_extract(struct inode *inode)
+static const char *prop_compression_extract(const struct inode *inode)
 {
 	switch (BTRFS_I(inode)->prop_compress) {
 	case BTRFS_COMPRESS_ZLIB:
@@ -385,7 +385,7 @@ static struct prop_handler prop_handlers[] = {
 };
 
 int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
-			      struct inode *inode, struct inode *parent)
+			      struct inode *inode, const struct inode *parent)
 {
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	struct btrfs_fs_info *fs_info = root->fs_info;
diff --git a/fs/btrfs/props.h b/fs/btrfs/props.h
index f60cd89feb29..24131b29d842 100644
--- a/fs/btrfs/props.h
+++ b/fs/btrfs/props.h
@@ -26,6 +26,6 @@ int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path);
 
 int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
 			      struct inode *inode,
-			      struct inode *dir);
+			      const struct inode *dir);
 
 #endif
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 4d0d0a041faf..31249b5200b7 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -30,7 +30,7 @@
 #include "root-tree.h"
 #include "tree-checker.h"
 
-enum btrfs_qgroup_mode btrfs_qgroup_mode(struct btrfs_fs_info *fs_info)
+enum btrfs_qgroup_mode btrfs_qgroup_mode(const struct btrfs_fs_info *fs_info)
 {
 	if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
 		return BTRFS_QGROUP_MODE_DISABLED;
@@ -39,12 +39,12 @@ enum btrfs_qgroup_mode btrfs_qgroup_mode(struct btrfs_fs_info *fs_info)
 	return BTRFS_QGROUP_MODE_FULL;
 }
 
-bool btrfs_qgroup_enabled(struct btrfs_fs_info *fs_info)
+bool btrfs_qgroup_enabled(const struct btrfs_fs_info *fs_info)
 {
 	return btrfs_qgroup_mode(fs_info) != BTRFS_QGROUP_MODE_DISABLED;
 }
 
-bool btrfs_qgroup_full_accounting(struct btrfs_fs_info *fs_info)
+bool btrfs_qgroup_full_accounting(const struct btrfs_fs_info *fs_info)
 {
 	return btrfs_qgroup_mode(fs_info) == BTRFS_QGROUP_MODE_FULL;
 }
@@ -107,7 +107,7 @@ static void qgroup_rsv_release(struct btrfs_fs_info *fs_info,
 
 static void qgroup_rsv_add_by_qgroup(struct btrfs_fs_info *fs_info,
 				     struct btrfs_qgroup *dest,
-				     struct btrfs_qgroup *src)
+				     const struct btrfs_qgroup *src)
 {
 	int i;
 
@@ -117,7 +117,7 @@ static void qgroup_rsv_add_by_qgroup(struct btrfs_fs_info *fs_info,
 
 static void qgroup_rsv_release_by_qgroup(struct btrfs_fs_info *fs_info,
 					 struct btrfs_qgroup *dest,
-					  struct btrfs_qgroup *src)
+					 const struct btrfs_qgroup *src)
 {
 	int i;
 
@@ -141,14 +141,14 @@ static void btrfs_qgroup_update_new_refcnt(struct btrfs_qgroup *qg, u64 seq,
 	qg->new_refcnt += mod;
 }
 
-static inline u64 btrfs_qgroup_get_old_refcnt(struct btrfs_qgroup *qg, u64 seq)
+static inline u64 btrfs_qgroup_get_old_refcnt(const struct btrfs_qgroup *qg, u64 seq)
 {
 	if (qg->old_refcnt < seq)
 		return 0;
 	return qg->old_refcnt - seq;
 }
 
-static inline u64 btrfs_qgroup_get_new_refcnt(struct btrfs_qgroup *qg, u64 seq)
+static inline u64 btrfs_qgroup_get_new_refcnt(const struct btrfs_qgroup *qg, u64 seq)
 {
 	if (qg->new_refcnt < seq)
 		return 0;
@@ -171,7 +171,7 @@ qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
 static void qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info);
 
 /* must be called with qgroup_ioctl_lock held */
-static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,
+static struct btrfs_qgroup *find_qgroup_rb(const struct btrfs_fs_info *fs_info,
 					   u64 qgroupid)
 {
 	struct rb_node *n = fs_info->qgroup_tree.rb_node;
@@ -346,7 +346,7 @@ static int del_relation_rb(struct btrfs_fs_info *fs_info,
 }
 
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
-int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
+int btrfs_verify_qgroup_counts(const struct btrfs_fs_info *fs_info, u64 qgroupid,
 			       u64 rfer, u64 excl)
 {
 	struct btrfs_qgroup *qgroup;
@@ -608,7 +608,7 @@ out:
  * Return false if no reserved space is left.
  * Return true if some reserved space is leaked.
  */
-bool btrfs_check_quota_leak(struct btrfs_fs_info *fs_info)
+bool btrfs_check_quota_leak(const struct btrfs_fs_info *fs_info)
 {
 	struct rb_node *node;
 	bool ret = false;
@@ -4903,7 +4903,7 @@ void btrfs_free_squota_rsv(struct btrfs_fs_info *fs_info, u64 root, u64 rsv_byte
 }
 
 int btrfs_record_squota_delta(struct btrfs_fs_info *fs_info,
-			      struct btrfs_squota_delta *delta)
+			      const struct btrfs_squota_delta *delta)
 {
 	int ret;
 	struct btrfs_qgroup *qgroup;
diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h
index 7c535710efa5..95881dcab684 100644
--- a/fs/btrfs/qgroup.h
+++ b/fs/btrfs/qgroup.h
@@ -311,9 +311,9 @@ enum btrfs_qgroup_mode {
 	BTRFS_QGROUP_MODE_SIMPLE
 };
 
-enum btrfs_qgroup_mode btrfs_qgroup_mode(struct btrfs_fs_info *fs_info);
-bool btrfs_qgroup_enabled(struct btrfs_fs_info *fs_info);
-bool btrfs_qgroup_full_accounting(struct btrfs_fs_info *fs_info);
+enum btrfs_qgroup_mode btrfs_qgroup_mode(const struct btrfs_fs_info *fs_info);
+bool btrfs_qgroup_enabled(const struct btrfs_fs_info *fs_info);
+bool btrfs_qgroup_full_accounting(const struct btrfs_fs_info *fs_info);
 int btrfs_quota_enable(struct btrfs_fs_info *fs_info,
 		       struct btrfs_ioctl_quota_ctl_args *quota_ctl_args);
 int btrfs_quota_disable(struct btrfs_fs_info *fs_info);
@@ -361,7 +361,7 @@ void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
 			       enum btrfs_qgroup_rsv_type type);
 
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
-int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
+int btrfs_verify_qgroup_counts(const struct btrfs_fs_info *fs_info, u64 qgroupid,
 			       u64 rfer, u64 excl);
 #endif
 
@@ -431,9 +431,9 @@ int btrfs_qgroup_add_swapped_blocks(struct btrfs_trans_handle *trans,
 int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans,
 		struct btrfs_root *root, struct extent_buffer *eb);
 void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans);
-bool btrfs_check_quota_leak(struct btrfs_fs_info *fs_info);
+bool btrfs_check_quota_leak(const struct btrfs_fs_info *fs_info);
 void btrfs_free_squota_rsv(struct btrfs_fs_info *fs_info, u64 root, u64 rsv_bytes);
 int btrfs_record_squota_delta(struct btrfs_fs_info *fs_info,
-			      struct btrfs_squota_delta *delta);
+			      const struct btrfs_squota_delta *delta);
 
 #endif
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 2099b5f8c022..8159695ef69c 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -8066,7 +8066,7 @@ static void dedupe_in_progress_warn(const struct btrfs_root *root)
 		      btrfs_root_id(root), root->dedupe_in_progress);
 }
 
-long btrfs_ioctl_send(struct inode *inode, struct btrfs_ioctl_send_args *arg)
+long btrfs_ioctl_send(struct inode *inode, const struct btrfs_ioctl_send_args *arg)
 {
 	int ret = 0;
 	struct btrfs_root *send_root = BTRFS_I(inode)->root;
diff --git a/fs/btrfs/send.h b/fs/btrfs/send.h
index dd1c9f02b011..8bd5aeafb6f5 100644
--- a/fs/btrfs/send.h
+++ b/fs/btrfs/send.h
@@ -182,6 +182,6 @@ enum {
 	__BTRFS_SEND_A_MAX		= 35,
 };
 
-long btrfs_ioctl_send(struct inode *inode, struct btrfs_ioctl_send_args *arg);
+long btrfs_ioctl_send(struct inode *inode, const struct btrfs_ioctl_send_args *arg);
 
 #endif
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 70274a438049..549ad700e49e 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -629,7 +629,7 @@ static void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info)
 	btrfs_clear_opt(fs_info->mount_opt, NOSPACECACHE);
 }
 
-static bool check_ro_option(struct btrfs_fs_info *fs_info,
+static bool check_ro_option(const struct btrfs_fs_info *fs_info,
 			    unsigned long mount_opt, unsigned long opt,
 			    const char *opt_name)
 {
@@ -641,7 +641,7 @@ static bool check_ro_option(struct btrfs_fs_info *fs_info,
 	return false;
 }
 
-bool btrfs_check_options(struct btrfs_fs_info *info, unsigned long *mount_opt,
+bool btrfs_check_options(const struct btrfs_fs_info *info, unsigned long *mount_opt,
 			 unsigned long flags)
 {
 	bool ret = true;
diff --git a/fs/btrfs/super.h b/fs/btrfs/super.h
index cbcab434b5ec..d2b8ebb46bc6 100644
--- a/fs/btrfs/super.h
+++ b/fs/btrfs/super.h
@@ -10,7 +10,7 @@
 struct super_block;
 struct btrfs_fs_info;
 
-bool btrfs_check_options(struct btrfs_fs_info *info, unsigned long *mount_opt,
+bool btrfs_check_options(const struct btrfs_fs_info *info, unsigned long *mount_opt,
 			 unsigned long flags);
 int btrfs_sync_fs(struct super_block *sb, int wait);
 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
diff --git a/fs/btrfs/uuid-tree.c b/fs/btrfs/uuid-tree.c
index b0aff297d67d..eae75bb572b9 100644
--- a/fs/btrfs/uuid-tree.c
+++ b/fs/btrfs/uuid-tree.c
@@ -13,7 +13,7 @@
 #include "accessors.h"
 #include "uuid-tree.h"
 
-static void btrfs_uuid_to_key(u8 *uuid, u8 type, struct btrfs_key *key)
+static void btrfs_uuid_to_key(const u8 *uuid, u8 type, struct btrfs_key *key)
 {
 	key->type = type;
 	key->objectid = get_unaligned_le64(uuid);
@@ -21,7 +21,7 @@ static void btrfs_uuid_to_key(u8 *uuid, u8 type, struct btrfs_key *key)
 }
 
 /* return -ENOENT for !found, < 0 for errors, or 0 if an item was found */
-static int btrfs_uuid_tree_lookup(struct btrfs_root *uuid_root, u8 *uuid,
+static int btrfs_uuid_tree_lookup(struct btrfs_root *uuid_root, const u8 *uuid,
 				  u8 type, u64 subid)
 {
 	int ret;
@@ -81,7 +81,7 @@ out:
 	return ret;
 }
 
-int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
+int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, const u8 *uuid, u8 type,
 			u64 subid_cpu)
 {
 	struct btrfs_fs_info *fs_info = trans->fs_info;
@@ -145,7 +145,7 @@ out:
 	return ret;
 }
 
-int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
+int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, const u8 *uuid, u8 type,
 			u64 subid)
 {
 	struct btrfs_fs_info *fs_info = trans->fs_info;
@@ -256,7 +256,7 @@ out:
  * < 0	if an error occurred
  */
 static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info,
-				       u8 *uuid, u8 type, u64 subvolid)
+				       const u8 *uuid, u8 type, u64 subvolid)
 {
 	int ret = 0;
 	struct btrfs_root *subvol_root;
diff --git a/fs/btrfs/uuid-tree.h b/fs/btrfs/uuid-tree.h
index 080ede0227ae..a3f5757cc7cf 100644
--- a/fs/btrfs/uuid-tree.h
+++ b/fs/btrfs/uuid-tree.h
@@ -8,9 +8,9 @@
 struct btrfs_trans_handle;
 struct btrfs_fs_info;
 
-int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
+int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, const u8 *uuid, u8 type,
 			u64 subid);
-int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type,
+int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, const u8 *uuid, u8 type,
 			u64 subid);
 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info);
 
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 4a773ddc3621..ac6056072ee8 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -722,7 +722,7 @@ error_free_page:
 	return -EINVAL;
 }
 
-u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb)
+const u8 *btrfs_sb_fsid_ptr(const struct btrfs_super_block *sb)
 {
 	bool has_metadata_uuid = (btrfs_super_incompat_flags(sb) &
 				  BTRFS_FEATURE_INCOMPAT_METADATA_UUID);
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 66e6fc481ecd..37a09ebb34dd 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -834,6 +834,6 @@ int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info);
 bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical);
 
 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);
-u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb);
+const u8 *btrfs_sb_fsid_ptr(const struct btrfs_super_block *sb);
 
 #endif
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index 15d0999e340e..0288fe541dca 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -24,7 +24,7 @@
 #include "accessors.h"
 #include "dir-item.h"
 
-int btrfs_getxattr(struct inode *inode, const char *name,
+int btrfs_getxattr(const struct inode *inode, const char *name,
 				void *buffer, size_t size)
 {
 	struct btrfs_dir_item *di;
diff --git a/fs/btrfs/xattr.h b/fs/btrfs/xattr.h
index b9376ea258ff..8dc4cf49f6f0 100644
--- a/fs/btrfs/xattr.h
+++ b/fs/btrfs/xattr.h
@@ -14,7 +14,7 @@ struct btrfs_trans_handle;
 
 extern const struct xattr_handler * const btrfs_xattr_handlers[];
 
-int btrfs_getxattr(struct inode *inode, const char *name,
+int btrfs_getxattr(const struct inode *inode, const char *name,
 		void *buffer, size_t size);
 int btrfs_setxattr(struct btrfs_trans_handle *trans, struct inode *inode,
 		   const char *name, const void *value, size_t size, int flags);
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index bc4538109cef..992a5b7756ca 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -767,7 +767,7 @@ int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
 	return 0;
 }
 
-int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info, unsigned long *mount_opt)
+int btrfs_check_mountopts_zoned(const struct btrfs_fs_info *info, unsigned long *mount_opt)
 {
 	if (!btrfs_is_zoned(info))
 		return 0;
diff --git a/fs/btrfs/zoned.h b/fs/btrfs/zoned.h
index ff605beb84ef..d66d00c08001 100644
--- a/fs/btrfs/zoned.h
+++ b/fs/btrfs/zoned.h
@@ -58,7 +58,7 @@ int btrfs_get_dev_zone_info(struct btrfs_device *device, bool populate_cache);
 void btrfs_destroy_dev_zone_info(struct btrfs_device *device);
 struct btrfs_zoned_device_info *btrfs_clone_dev_zone_info(struct btrfs_device *orig_dev);
 int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info);
-int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info, unsigned long *mount_opt);
+int btrfs_check_mountopts_zoned(const struct btrfs_fs_info *info, unsigned long *mount_opt);
 int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,
 			       u64 *bytenr_ret);
 int btrfs_sb_log_location(struct btrfs_device *device, int mirror, int rw,
@@ -129,7 +129,7 @@ static inline int btrfs_check_zoned_mode(const struct btrfs_fs_info *fs_info)
 	return -EOPNOTSUPP;
 }
 
-static inline int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info,
+static inline int btrfs_check_mountopts_zoned(const struct btrfs_fs_info *info,
 					      unsigned long *mount_opt)
 {
 	return 0;