xfs: move inode copy-on-write predicates to xfs_inode.[ch]

Move these inode predicate functions to xfs_inode.[ch] since they're not
reflink functions.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/xfs_inode.c

@@ -4297,3 +4297,11 @@ xfs_inode_alloc_unitsize(
 
 	return XFS_FSB_TO_B(ip->i_mount, blocks);
 }
+
+/* Should we always be using copy on write for file writes? */
+bool
+xfs_is_always_cow_inode(
+	struct xfs_inode	*ip)
+{
+	return ip->i_mount->m_always_cow && xfs_has_reflink(ip->i_mount);
+}

fs/xfs/xfs_inode.h

@@ -292,6 +292,13 @@ static inline bool xfs_is_metadata_inode(struct xfs_inode *ip)
 		xfs_is_quota_inode(&mp->m_sb, ip->i_ino);
 }
 
+bool xfs_is_always_cow_inode(struct xfs_inode *ip);
+
+static inline bool xfs_is_cow_inode(struct xfs_inode *ip)
+{
+	return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip);
+}
+
 /*
  * Check if an inode has any data in the COW fork.  This might be often false
  * even for inodes with the reflink flag when there is no pending COW operation.

fs/xfs/xfs_reflink.h

@@ -6,16 +6,6 @@
 #ifndef __XFS_REFLINK_H
 #define __XFS_REFLINK_H 1
 
-static inline bool xfs_is_always_cow_inode(struct xfs_inode *ip)
-{
-	return ip->i_mount->m_always_cow && xfs_has_reflink(ip->i_mount);
-}
-
-static inline bool xfs_is_cow_inode(struct xfs_inode *ip)
-{
-	return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip);
-}
-
 extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
 		struct xfs_bmbt_irec *irec, bool *shared);
 int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,