xfs: connect in-memory btrees to xfiles

Add to our stubbed-out in-memory btrees the ability to connect them with
an actual in-memory backing file (aka xfiles) and the necessary pieces
to track free space in the xfile and flush dirty xfbtree buffers on
demand, which we'll need for online repair.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/fs/xfs/libxfs/xfs_btree_mem.h b/fs/xfs/libxfs/xfs_btree_mem.h
index 76304233d86d..ddeb05ddba4a 100644
--- a/fs/xfs/libxfs/xfs_btree_mem.h
+++ b/fs/xfs/libxfs/xfs_btree_mem.h
@@ -18,6 +18,14 @@ void xfs_btree_mem_init_ptr_from_cur(struct xfs_btree_cur *cur,
 		union xfs_btree_ptr *ptr);
 struct xfs_btree_cur *xfs_btree_mem_dup_cursor(struct xfs_btree_cur *cur);
 unsigned int xfs_btree_mem_head_nlevels(struct xfs_buf *head_bp);
+
+struct xfbtree *xfbtree_create(struct xfs_mount *mp, xfs_btnum_t btnum,
+		const struct xfs_buf_ops *b_ops, unsigned int flags,
+		const char *description);
+int xfbtree_alloc_block(struct xfs_btree_cur *cur,
+		const union xfs_btree_ptr *start, union xfs_btree_ptr *ptr,
+		int *stat);
+int xfbtree_free_block(struct xfs_btree_cur *cur, struct xfs_buf *bp);
 #else
 static inline struct xfs_buftarg *
 xfbtree_target(struct xfbtree *xfbtree)
@@ -54,6 +62,31 @@ xfs_btree_mem_head_nlevels(struct xfs_buf *head_bp)
 {
 	return 0;
 }
+
+static inline struct xfbtree *
+xfbtree_create(struct xfs_mount *mp, xfs_btnum_t btnum,
+		const struct xfs_buf_ops *b_ops, unsigned int flags,
+		const char *description)
+{
+	return NULL;
+}
+
+static inline int
+xfbtree_alloc_block(struct xfs_btree_cur *cur,
+		const union xfs_btree_ptr *start, union xfs_btree_ptr *ptr,
+		int *stat)
+{
+	return -EINVAL;
+}
+
+static inline int
+xfbtree_free_block(struct xfs_btree_cur *cur, struct xfs_buf *bp)
+{
+	return -EINVAL;
+}
 #endif /* CONFIG_XFS_ONLINE_REPAIR */
 
+/* btree has long pointers */
+#define XFBTREE_CREATE_LONG_PTRS	(1U << 0)
+
 #endif /* __XFS_BTREE_MEM_H__ */