[PATCH 03/18] Squashfs: convert SQUASHFS_FRAGMENT_* to inline functions

[Phillip Lougher <phillip@squashfs.org.uk>]

Convert old fashioned #define macros into inline functions.  This has
the following improvements:

1. Inline functions are typed, which makes the width and sigedness of
   input and outputs explicit, which reduces errors.

2. The inline functions enable more sanity checking to be added in
   later commits.

3. Inline functions are easier to read than #define macros, which
   improves code comprehension.

Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
---
 fs/squashfs/fragment.c         |  7 ++++---
 fs/squashfs/squashfs_fs.h      | 17 -----------------
 fs/squashfs/squashfs_helpers.h | 27 +++++++++++++++++++++++++++
 3 files changed, 31 insertions(+), 20 deletions(-)

diff --git a/fs/squashfs/fragment.c b/fs/squashfs/fragment.c
index 49602b9a42e1..e945d045d55e 100644
--- a/fs/squashfs/fragment.c
+++ b/fs/squashfs/fragment.c
@@ -26,6 +26,7 @@
 
 #include "squashfs_fs.h"
 #include "squashfs_fs_sb.h"
+#include "squashfs_helpers.h"
 #include "squashfs.h"
 
 /*
@@ -42,8 +43,8 @@ int squashfs_frag_lookup(struct super_block *sb, unsigned int fragment,
 
 	if (fragment >= msblk->fragments)
 		return -EIO;
-	block = SQUASHFS_FRAGMENT_INDEX(fragment);
-	offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
+	block = squashfs_fragment_index(fragment);
+	offset = squashfs_fragment_index_offset(fragment);
 
 	start_block = le64_to_cpu(msblk->fragment_index[block]);
 
@@ -63,7 +64,7 @@ int squashfs_frag_lookup(struct super_block *sb, unsigned int fragment,
 __le64 *squashfs_read_fragment_index_table(struct super_block *sb,
 	u64 fragment_table_start, u64 next_table, unsigned int fragments)
 {
-	unsigned int length = SQUASHFS_FRAGMENT_INDEX_BYTES(fragments);
+	unsigned int length = squashfs_fragment_index_bytes(fragments);
 	__le64 *table;
 
 	/*
diff --git a/fs/squashfs/squashfs_fs.h b/fs/squashfs/squashfs_fs.h
index 6d993531a5df..3dbd174b5f21 100644
--- a/fs/squashfs/squashfs_fs.h
+++ b/fs/squashfs/squashfs_fs.h
@@ -107,23 +107,6 @@ static inline int squashfs_block_size(__le32 raw)
 	return (size >> 25) ? -EIO : size;
 }
 
-/* fragment and fragment table defines */
-#define SQUASHFS_FRAGMENT_BYTES(A)	\
-				((A) * sizeof(struct squashfs_fragment_entry))
-
-#define SQUASHFS_FRAGMENT_INDEX(A)	(SQUASHFS_FRAGMENT_BYTES(A) / \
-					SQUASHFS_METADATA_SIZE)
-
-#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)	(SQUASHFS_FRAGMENT_BYTES(A) % \
-						SQUASHFS_METADATA_SIZE)
-
-#define SQUASHFS_FRAGMENT_INDEXES(A)	((SQUASHFS_FRAGMENT_BYTES(A) + \
-					SQUASHFS_METADATA_SIZE - 1) / \
-					SQUASHFS_METADATA_SIZE)
-
-#define SQUASHFS_FRAGMENT_INDEX_BYTES(A)	(SQUASHFS_FRAGMENT_INDEXES(A) *\
-						sizeof(u64))
-
 /* inode lookup table defines */
 #define SQUASHFS_LOOKUP_BYTES(A)	((A) * sizeof(u64))
 
diff --git a/fs/squashfs/squashfs_helpers.h b/fs/squashfs/squashfs_helpers.h
index afef13cd6dc0..b99ca67c729a 100644
--- a/fs/squashfs/squashfs_helpers.h
+++ b/fs/squashfs/squashfs_helpers.h
@@ -51,4 +51,31 @@ static inline s64 squashfs_mkinode(u32 start, u16 offset)
 {
 	return ((s64)start << 16) | offset;
 }
+
+/* fragment and fragment table defines */
+static inline s64 squashfs_fragment_bytes(u32 fragments)
+{
+	return fragments * sizeof(struct squashfs_fragment_entry);
+}
+
+static inline s32 squashfs_fragment_index(u32 fragments)
+{
+	return squashfs_fragment_bytes(fragments) / SQUASHFS_METADATA_SIZE;
+}
+
+static inline s16 squashfs_fragment_index_offset(u32 fragments)
+{
+	return squashfs_fragment_bytes(fragments) % SQUASHFS_METADATA_SIZE;
+}
+
+static inline s32 squashfs_fragment_indexes(u32 fragments)
+{
+	return (squashfs_fragment_bytes(fragments) + (SQUASHFS_METADATA_SIZE - 1)) /
+		SQUASHFS_METADATA_SIZE;
+}
+
+static inline s32 squashfs_fragment_index_bytes(u32 fragments)
+{
+	return squashfs_fragment_indexes(fragments) * sizeof(long long);
+}
 #endif
-- 
2.47.3