f2fs: check the use of macros on block counts and addresses

This patch cleans up the existing and new macros for readability.

Rule is like this.

         ,-----------------------------------------> MAX_BLKADDR -,
         |  ,------------- TOTAL_BLKS ----------------------------,
         |  |                                                     |
         |  ,- seg0_blkaddr   ,----- sit/nat/ssa/main blkaddress  |
block    |  | (SEG0_BLKADDR)  | | | |   (e.g., MAIN_BLKADDR)      |
address  0..x................ a b c d .............................
            |                                                     |
global seg# 0...................... m .............................
            |                       |                             |
            |                       `------- MAIN_SEGS -----------'
            `-------------- TOTAL_SEGS ---------------------------'
                                    |                             |
 seg#                               0..........xx..................

= Note =
 o GET_SEGNO_FROM_SEG0 : blk address -> global segno
 o GET_SEGNO           : blk address -> segno
 o START_BLOCK         : segno -> starting block address

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 25 insertions, 34 deletions

diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 4588545b3030..a7e3e9112100 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -45,16 +45,26 @@
 	 (secno == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno /		\
 	  sbi->segs_per_sec))	\
 
-#define START_BLOCK(sbi, segno)						\
-	(SM_I(sbi)->seg0_blkaddr +					\
+#define MAIN_BLKADDR(sbi)	(SM_I(sbi)->main_blkaddr)
+#define SEG0_BLKADDR(sbi)	(SM_I(sbi)->seg0_blkaddr)
+
+#define MAIN_SEGS(sbi)	(SM_I(sbi)->main_segments)
+#define MAIN_SECS(sbi)	(sbi->total_sections)
+
+#define TOTAL_SEGS(sbi)	(SM_I(sbi)->segment_count)
+#define TOTAL_BLKS(sbi)	(TOTAL_SEGS(sbi) << sbi->log_blocks_per_seg)
+
+#define MAX_BLKADDR(sbi)	(SEG0_BLKADDR(sbi) + TOTAL_BLKS(sbi))
+#define SEGMENT_SIZE(sbi)	(1 << (sbi->log_blocksize +		\
+					sbi->log_blocks_per_seg))
+
+#define START_BLOCK(sbi, segno)	(SEG0_BLKADDR(sbi) +			\
 	 (GET_R2L_SEGNO(FREE_I(sbi), segno) << sbi->log_blocks_per_seg))
+
 #define NEXT_FREE_BLKADDR(sbi, curseg)					\
 	(START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff)
 
-#define MAIN_BASE_BLOCK(sbi)	(SM_I(sbi)->main_blkaddr)
-
-#define GET_SEGOFF_FROM_SEG0(sbi, blk_addr)				\
-	((blk_addr) - SM_I(sbi)->seg0_blkaddr)
+#define GET_SEGOFF_FROM_SEG0(sbi, blk_addr)	((blk_addr) - SEG0_BLKADDR(sbi))
 #define GET_SEGNO_FROM_SEG0(sbi, blk_addr)				\
 	(GET_SEGOFF_FROM_SEG0(sbi, blk_addr) >> sbi->log_blocks_per_seg)
 #define GET_BLKOFF_FROM_SEG0(sbi, blk_addr)				\
@@ -82,12 +92,9 @@
 #define	START_SEGNO(segno)		\
 	(SIT_BLOCK_OFFSET(segno) * SIT_ENTRY_PER_BLOCK)
 #define SIT_BLK_CNT(sbi)			\
-	((TOTAL_SEGS(sbi) + SIT_ENTRY_PER_BLOCK - 1) / SIT_ENTRY_PER_BLOCK)
+	((MAIN_SEGS(sbi) + SIT_ENTRY_PER_BLOCK - 1) / SIT_ENTRY_PER_BLOCK)
 #define f2fs_bitmap_size(nr)			\
 	(BITS_TO_LONGS(nr) * sizeof(unsigned long))
-#define TOTAL_SEGS(sbi)	(SM_I(sbi)->main_segments)
-#define TOTAL_SECS(sbi)	(sbi->total_sections)
-#define TOTAL_BLKS(sbi)	(SM_I(sbi)->segment_count << sbi->log_blocks_per_seg)
 
 #define SECTOR_FROM_BLOCK(blk_addr)					\
 	(((sector_t)blk_addr) << F2FS_LOG_SECTORS_PER_BLOCK)
@@ -323,7 +330,7 @@ static inline void __set_free(struct f2fs_sb_info *sbi, unsigned int segno)
 	clear_bit(segno, free_i->free_segmap);
 	free_i->free_segments++;
 
-	next = find_next_bit(free_i->free_segmap, TOTAL_SEGS(sbi), start_segno);
+	next = find_next_bit(free_i->free_segmap, MAIN_SEGS(sbi), start_segno);
 	if (next >= start_segno + sbi->segs_per_sec) {
 		clear_bit(secno, free_i->free_secmap);
 		free_i->free_sections++;
@@ -542,18 +549,13 @@ static inline unsigned short curseg_blkoff(struct f2fs_sb_info *sbi, int type)
 #ifdef CONFIG_F2FS_CHECK_FS
 static inline void check_seg_range(struct f2fs_sb_info *sbi, unsigned int segno)
 {
-	unsigned int end_segno = SM_I(sbi)->segment_count - 1;
-	BUG_ON(segno > end_segno);
+	BUG_ON(segno > TOTAL_SEGS(sbi) - 1);
 }
 
 static inline void verify_block_addr(struct f2fs_sb_info *sbi, block_t blk_addr)
 {
-	struct f2fs_sm_info *sm_info = SM_I(sbi);
-	block_t total_blks = TOTAL_BLKS(sbi);
-	block_t start_addr = sm_info->seg0_blkaddr;
-	block_t end_addr = start_addr + total_blks - 1;
-	BUG_ON(blk_addr < start_addr);
-	BUG_ON(blk_addr > end_addr);
+	BUG_ON(blk_addr < SEG0_BLKADDR(sbi));
+	BUG_ON(blk_addr >= MAX_BLKADDR(sbi));
 }
 
 /*
@@ -562,8 +564,6 @@ static inline void verify_block_addr(struct f2fs_sb_info *sbi, block_t blk_addr)
 static inline void check_block_count(struct f2fs_sb_info *sbi,
 		int segno, struct f2fs_sit_entry *raw_sit)
 {
-	struct f2fs_sm_info *sm_info = SM_I(sbi);
-	unsigned int end_segno = sm_info->segment_count - 1;
 	bool is_valid  = test_bit_le(0, raw_sit->valid_map) ? true : false;
 	int valid_blocks = 0;
 	int cur_pos = 0, next_pos;
@@ -572,7 +572,7 @@ static inline void check_block_count(struct f2fs_sb_info *sbi,
 	BUG_ON(GET_SIT_VBLOCKS(raw_sit) > sbi->blocks_per_seg);
 
 	/* check boundary of a given segment number */
-	BUG_ON(segno > end_segno);
+	BUG_ON(segno > TOTAL_SEGS(sbi) - 1);
 
 	/* check bitmap with valid block count */
 	do {
@@ -593,20 +593,13 @@ static inline void check_block_count(struct f2fs_sb_info *sbi,
 #else
 static inline void check_seg_range(struct f2fs_sb_info *sbi, unsigned int segno)
 {
-	unsigned int end_segno = SM_I(sbi)->segment_count - 1;
-
-	if (segno > end_segno)
+	if (segno > TOTAL_SEGS(sbi) - 1)
 		sbi->need_fsck = true;
 }
 
 static inline void verify_block_addr(struct f2fs_sb_info *sbi, block_t blk_addr)
 {
-	struct f2fs_sm_info *sm_info = SM_I(sbi);
-	block_t total_blks = TOTAL_BLKS(sbi);
-	block_t start_addr = sm_info->seg0_blkaddr;
-	block_t end_addr = start_addr + total_blks - 1;
-
-	if (blk_addr < start_addr || blk_addr > end_addr)
+	if (blk_addr < SEG0_BLKADDR(sbi) || blk_addr >= MAX_BLKADDR(sbi))
 		sbi->need_fsck = true;
 }
 
@@ -616,14 +609,12 @@ static inline void verify_block_addr(struct f2fs_sb_info *sbi, block_t blk_addr)
 static inline void check_block_count(struct f2fs_sb_info *sbi,
 		int segno, struct f2fs_sit_entry *raw_sit)
 {
-	unsigned int end_segno = SM_I(sbi)->segment_count - 1;
-
 	/* check segment usage */
 	if (GET_SIT_VBLOCKS(raw_sit) > sbi->blocks_per_seg)
 		sbi->need_fsck = true;
 
 	/* check boundary of a given segment number */
-	if (segno > end_segno)
+	if (segno > TOTAL_SEGS(sbi) - 1)
 		sbi->need_fsck = true;
 }
 #endif