xfs: cleanup xfs_dir2_data_entsize

Remove the XFS_DIR2_DATA_ENTSIZE and XFS_DIR3_DATA_ENTSIZE and open
code them in their only caller, which now becomes so simple that
we can turn it into an inline function.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/libxfs/xfs_da_format.c

@@ -19,39 +19,6 @@
  * Directory data block operations
  */
 
-/*
- * For special situations, the dirent size ends up fixed because we always know
- * what the size of the entry is. That's true for the "." and "..", and
- * therefore we know that they are a fixed size and hence their offsets are
- * constant, as is the first entry.
- *
- * Hence, this calculation is written as a macro to be able to be calculated at
- * compile time and so certain offsets can be calculated directly in the
- * structure initaliser via the macro. There are two macros - one for dirents
- * with ftype and without so there are no unresolvable conditionals in the
- * calculations. We also use round_up() as XFS_DIR2_DATA_ALIGN is always a power
- * of 2 and the compiler doesn't reject it (unlike roundup()).
- */
-#define XFS_DIR2_DATA_ENTSIZE(n)					\
-	round_up((offsetof(struct xfs_dir2_data_entry, name[0]) + (n) +	\
-		 sizeof(xfs_dir2_data_off_t)), XFS_DIR2_DATA_ALIGN)
-
-#define XFS_DIR3_DATA_ENTSIZE(n)					\
-	round_up((offsetof(struct xfs_dir2_data_entry, name[0]) + (n) +	\
-		 sizeof(xfs_dir2_data_off_t) + sizeof(uint8_t)),	\
-		XFS_DIR2_DATA_ALIGN)
-
-int
-xfs_dir2_data_entsize(
-	struct xfs_mount	*mp,
-	int			n)
-{
-	if (xfs_sb_version_hasftype(&mp->m_sb))
-		return XFS_DIR3_DATA_ENTSIZE(n);
-	else
-		return XFS_DIR2_DATA_ENTSIZE(n);
-}
-
 static uint8_t
 xfs_dir2_data_get_ftype(
 	struct xfs_dir2_data_entry *dep)

fs/xfs/libxfs/xfs_dir2_priv.h

@@ -57,7 +57,6 @@ extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
 		struct xfs_buf *lbp, struct xfs_buf *dbp);
 
 /* xfs_dir2_data.c */
-int xfs_dir2_data_entsize(struct xfs_mount *mp, int n);
 __be16 *xfs_dir2_data_entry_tag_p(struct xfs_mount *mp,
 		struct xfs_dir2_data_entry *dep);
 
@@ -172,4 +171,18 @@ extern xfs_failaddr_t xfs_dir2_sf_verify(struct xfs_inode *ip);
 extern int xfs_readdir(struct xfs_trans *tp, struct xfs_inode *dp,
 		       struct dir_context *ctx, size_t bufsize);
 
+static inline unsigned int
+xfs_dir2_data_entsize(
+	struct xfs_mount	*mp,
+	unsigned int		namelen)
+{
+	unsigned int		len;
+
+	len = offsetof(struct xfs_dir2_data_entry, name[0]) + namelen +
+			sizeof(xfs_dir2_data_off_t) /* tag */;
+	if (xfs_sb_version_hasftype(&mp->m_sb))
+		len += sizeof(uint8_t);
+	return round_up(len, XFS_DIR2_DATA_ALIGN);
+}
+
 #endif /* __XFS_DIR2_PRIV_H__ */