Merge branch 'xfs-4.9-reflink-prep' into for-next

fs/xfs/xfs_mount.h

@@ -331,6 +331,22 @@ xfs_mp_fail_writes(struct xfs_mount *mp)
 }
 #endif
 
+/* per-AG block reservation data structures*/
+enum xfs_ag_resv_type {
+	XFS_AG_RESV_NONE = 0,
+	XFS_AG_RESV_METADATA,
+	XFS_AG_RESV_AGFL,
+};
+
+struct xfs_ag_resv {
+	/* number of blocks originally reserved here */
+	xfs_extlen_t			ar_orig_reserved;
+	/* number of blocks reserved here */
+	xfs_extlen_t			ar_reserved;
+	/* number of blocks originally asked for */
+	xfs_extlen_t			ar_asked;
+};
+
 /*
  * Per-ag incore structure, copies of information in agf and agi, to improve the
  * performance of allocation group selection.
@@ -378,8 +394,28 @@ typedef struct xfs_perag {
 	/* for rcu-safe freeing */
 	struct rcu_head	rcu_head;
 	int		pagb_count;	/* pagb slots in use */
+
+	/* Blocks reserved for all kinds of metadata. */
+	struct xfs_ag_resv	pag_meta_resv;
+	/* Blocks reserved for just AGFL-based metadata. */
+	struct xfs_ag_resv	pag_agfl_resv;
 } xfs_perag_t;
 
+static inline struct xfs_ag_resv *
+xfs_perag_resv(
+	struct xfs_perag	*pag,
+	enum xfs_ag_resv_type	type)
+{
+	switch (type) {
+	case XFS_AG_RESV_METADATA:
+		return &pag->pag_meta_resv;
+	case XFS_AG_RESV_AGFL:
+		return &pag->pag_agfl_resv;
+	default:
+		return NULL;
+	}
+}
+
 extern void	xfs_uuid_table_free(void);
 extern int	xfs_log_sbcount(xfs_mount_t *);
 extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);