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Message-id: <000101d12bec$6820eec0$3862cc40$@samsung.com>
Date: Tue, 01 Dec 2015 11:56:52 +0800
From: Chao Yu <chao2.yu@...sung.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: [PATCH] f2fs: use sbi->blocks_per_seg to avoid unnecessary calculation
Use sbi->blocks_per_seg directly to avoid unnecessary calculation when using
1 << sbi->log_blocks_per_seg.
Signed-off-by: Chao Yu <chao2.yu@...sung.com>
---
fs/f2fs/debug.c | 2 +-
fs/f2fs/f2fs.h | 3 +--
fs/f2fs/file.c | 5 ++---
fs/f2fs/gc.c | 4 ++--
fs/f2fs/node.h | 2 +-
5 files changed, 7 insertions(+), 9 deletions(-)
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index b0966f3..8ce2fe3 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -105,7 +105,7 @@ static void update_sit_info(struct f2fs_sb_info *sbi)
bimodal = 0;
total_vblocks = 0;
- blks_per_sec = sbi->segs_per_sec * (1 << sbi->log_blocks_per_seg);
+ blks_per_sec = sbi->segs_per_sec * sbi->blocks_per_seg;
hblks_per_sec = blks_per_sec / 2;
for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 0831db2..0052ae8 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1099,8 +1099,7 @@ static inline int get_dirty_pages(struct inode *inode)
static inline int get_blocktype_secs(struct f2fs_sb_info *sbi, int block_type)
{
- unsigned int pages_per_sec = sbi->segs_per_sec *
- (1 << sbi->log_blocks_per_seg);
+ unsigned int pages_per_sec = sbi->segs_per_sec * sbi->blocks_per_seg;
return ((get_pages(sbi, block_type) + pages_per_sec - 1)
>> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
}
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index b38af30..a018ed3 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1662,10 +1662,9 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
struct f2fs_map_blocks map;
struct extent_info ei;
pgoff_t pg_start, pg_end;
- unsigned int blk_per_seg = 1 << sbi->log_blocks_per_seg;
+ unsigned int blk_per_seg = sbi->blocks_per_seg;
unsigned int total = 0, sec_num;
- unsigned int pages_per_sec = sbi->segs_per_sec *
- (1 << sbi->log_blocks_per_seg);
+ unsigned int pages_per_sec = sbi->segs_per_sec * blk_per_seg;
block_t blk_end = 0;
bool fragmented = false;
int err;
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index fedbf67..ce350c4 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -173,9 +173,9 @@ static unsigned int get_max_cost(struct f2fs_sb_info *sbi,
{
/* SSR allocates in a segment unit */
if (p->alloc_mode == SSR)
- return 1 << sbi->log_blocks_per_seg;
+ return sbi->blocks_per_seg;
if (p->gc_mode == GC_GREEDY)
- return (1 << sbi->log_blocks_per_seg) * p->ofs_unit;
+ return sbi->blocks_per_seg * p->ofs_unit;
else if (p->gc_mode == GC_CB)
return UINT_MAX;
else /* No other gc_mode */
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index e4fffd2..2de759a 100644
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -183,7 +183,7 @@ static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start)
block_addr = (pgoff_t)(nm_i->nat_blkaddr +
(seg_off << sbi->log_blocks_per_seg << 1) +
- (block_off & ((1 << sbi->log_blocks_per_seg) - 1)));
+ (block_off & (sbi->blocks_per_seg - 1)));
if (f2fs_test_bit(block_off, nm_i->nat_bitmap))
block_addr += sbi->blocks_per_seg;
--
2.6.3
--
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