f2fs: add unlikely() macro for compiler optimization

As we know, some of our branch condition will rarely be true. So we could add
'unlikely' to let compiler optimize these code, by this way we could drop
unneeded 'jump' assemble code to improve performance.

change log:
 o add *unlikely* as many as possible across the whole source files at once
   suggested by Jaegeuk Kim.

Suggested-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

6 files changed, 33 insertions, 27 deletions

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 38f4a2245085..6b2106685b7a 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -82,13 +82,12 @@ static int f2fs_write_meta_page(struct page *page,
 	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 
 	/* Should not write any meta pages, if any IO error was occurred */
-	if (wbc->for_reclaim || sbi->por_doing ||
-			is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ERROR_FLAG)) {
-		dec_page_count(sbi, F2FS_DIRTY_META);
-		wbc->pages_skipped++;
-		set_page_dirty(page);
-		return AOP_WRITEPAGE_ACTIVATE;
-	}
+	if (unlikely(sbi->por_doing ||
+			is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ERROR_FLAG)))
+		goto redirty_out;
+
+	if (wbc->for_reclaim)
+		goto redirty_out;
 
 	wait_on_page_writeback(page);
 
@@ -96,6 +95,12 @@ static int f2fs_write_meta_page(struct page *page,
 	dec_page_count(sbi, F2FS_DIRTY_META);
 	unlock_page(page);
 	return 0;
+
+redirty_out:
+	dec_page_count(sbi, F2FS_DIRTY_META);
+	wbc->pages_skipped++;
+	set_page_dirty(page);
+	return AOP_WRITEPAGE_ACTIVATE;
 }
 
 static int f2fs_write_meta_pages(struct address_space *mapping,
@@ -137,7 +142,7 @@ long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 		nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
 				PAGECACHE_TAG_DIRTY,
 				min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
-		if (nr_pages == 0)
+		if (unlikely(nr_pages == 0))
 			break;
 
 		for (i = 0; i < nr_pages; i++) {
@@ -150,7 +155,8 @@ long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
 				unlock_page(page);
 				break;
 			}
-			if (nwritten++ >= nr_to_write)
+			nwritten++;
+			if (unlikely(nwritten >= nr_to_write))
 				break;
 		}
 		pagevec_release(&pvec);
@@ -200,7 +206,7 @@ int acquire_orphan_inode(struct f2fs_sb_info *sbi)
 	max_orphans = (sbi->blocks_per_seg - 2 - NR_CURSEG_TYPE)
 				* F2FS_ORPHANS_PER_BLOCK;
 	mutex_lock(&sbi->orphan_inode_mutex);
-	if (sbi->n_orphans >= max_orphans)
+	if (unlikely(sbi->n_orphans >= max_orphans))
 		err = -ENOSPC;
 	else
 		sbi->n_orphans++;
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 4e2fc09f0e4f..2ce5a9ef508b 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -251,7 +251,7 @@ int reserve_new_block(struct dnode_of_data *dn)
 
 	if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))
 		return -EPERM;
-	if (!inc_valid_block_count(sbi, dn->inode, 1))
+	if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
 		return -ENOSPC;
 
 	trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node);
@@ -711,7 +711,7 @@ static int f2fs_write_data_page(struct page *page,
 
 	zero_user_segment(page, offset, PAGE_CACHE_SIZE);
 write:
-	if (sbi->por_doing) {
+	if (unlikely(sbi->por_doing)) {
 		err = AOP_WRITEPAGE_ACTIVATE;
 		goto redirty_out;
 	}
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 594fc1bb64ef..0cc26ba07c3b 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -190,7 +190,7 @@ struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
 	unsigned int max_depth;
 	unsigned int level;
 
-	if (namelen > F2FS_NAME_LEN)
+	if (unlikely(namelen > F2FS_NAME_LEN))
 		return NULL;
 
 	if (npages == 0)
@@ -461,7 +461,7 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name, struct inode *in
 	}
 
 start:
-	if (current_depth == MAX_DIR_HASH_DEPTH)
+	if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
 		return -ENOSPC;
 
 	/* Increase the depth, if required */
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 10eca022e1e1..dca18b3bcc62 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -574,7 +574,7 @@ static inline void f2fs_unlock_all(struct f2fs_sb_info *sbi)
 static inline int check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
 {
 	WARN_ON((nid >= NM_I(sbi)->max_nid));
-	if (nid >= NM_I(sbi)->max_nid)
+	if (unlikely(nid >= NM_I(sbi)->max_nid))
 		return -EINVAL;
 	return 0;
 }
@@ -600,7 +600,7 @@ static inline bool inc_valid_block_count(struct f2fs_sb_info *sbi,
 	spin_lock(&sbi->stat_lock);
 	valid_block_count =
 		sbi->total_valid_block_count + (block_t)count;
-	if (valid_block_count > sbi->user_block_count) {
+	if (unlikely(valid_block_count > sbi->user_block_count)) {
 		spin_unlock(&sbi->stat_lock);
 		return false;
 	}
@@ -719,13 +719,13 @@ static inline bool inc_valid_node_count(struct f2fs_sb_info *sbi,
 	spin_lock(&sbi->stat_lock);
 
 	valid_block_count = sbi->total_valid_block_count + 1;
-	if (valid_block_count > sbi->user_block_count) {
+	if (unlikely(valid_block_count > sbi->user_block_count)) {
 		spin_unlock(&sbi->stat_lock);
 		return false;
 	}
 
 	valid_node_count = sbi->total_valid_node_count + 1;
-	if (valid_node_count > sbi->total_node_count) {
+	if (unlikely(valid_node_count > sbi->total_node_count)) {
 		spin_unlock(&sbi->stat_lock);
 		return false;
 	}
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 099f06f84e29..2e41636be476 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -94,7 +94,7 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
 	int i;
 
 	for (i = 0; i < FREE_NID_PAGES; i++, nid += NAT_ENTRY_PER_BLOCK) {
-		if (nid >= nm_i->max_nid)
+		if (unlikely(nid >= nm_i->max_nid))
 			nid = 0;
 		index = current_nat_addr(sbi, nid);
 
@@ -1160,7 +1160,7 @@ int wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino)
 			struct page *page = pvec.pages[i];
 
 			/* until radix tree lookup accepts end_index */
-			if (page->index > end)
+			if (unlikely(page->index > end))
 				continue;
 
 			if (ino && ino_of_node(page) == ino) {
@@ -1190,7 +1190,7 @@ static int f2fs_write_node_page(struct page *page,
 	block_t new_addr;
 	struct node_info ni;
 
-	if (sbi->por_doing)
+	if (unlikely(sbi->por_doing))
 		goto redirty_out;
 
 	wait_on_page_writeback(page);
@@ -1326,7 +1326,7 @@ static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid, bool build)
 		return -1;
 
 	/* 0 nid should not be used */
-	if (nid == 0)
+	if (unlikely(nid == 0))
 		return 0;
 
 	if (build) {
@@ -1379,7 +1379,7 @@ static void scan_nat_page(struct f2fs_nm_info *nm_i,
 
 	for (; i < NAT_ENTRY_PER_BLOCK; i++, start_nid++) {
 
-		if (start_nid >= nm_i->max_nid)
+		if (unlikely(start_nid >= nm_i->max_nid))
 			break;
 
 		blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
@@ -1413,7 +1413,7 @@ static void build_free_nids(struct f2fs_sb_info *sbi)
 		f2fs_put_page(page, 1);
 
 		nid += (NAT_ENTRY_PER_BLOCK - (nid % NAT_ENTRY_PER_BLOCK));
-		if (nid >= nm_i->max_nid)
+		if (unlikely(nid >= nm_i->max_nid))
 			nid = 0;
 
 		if (i++ == FREE_NID_PAGES)
@@ -1447,7 +1447,7 @@ bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
 	struct free_nid *i = NULL;
 	struct list_head *this;
 retry:
-	if (sbi->total_valid_node_count + 1 >= nm_i->max_nid)
+	if (unlikely(sbi->total_valid_node_count + 1 >= nm_i->max_nid))
 		return false;
 
 	spin_lock(&nm_i->free_nid_list_lock);
@@ -1557,7 +1557,7 @@ int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
 	new_ni = old_ni;
 	new_ni.ino = ino;
 
-	if (!inc_valid_node_count(sbi, NULL))
+	if (unlikely(!inc_valid_node_count(sbi, NULL)))
 		WARN_ON(1);
 	set_node_addr(sbi, &new_ni, NEW_ADDR);
 	inc_valid_inode_count(sbi);
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 26812fc0fa12..ea563760f4b7 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -457,7 +457,7 @@ static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi, int freed)
 	int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
 	int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
 
-	if (sbi->por_doing)
+	if (unlikely(sbi->por_doing))
 		return false;
 
 	return ((free_sections(sbi) + freed) <= (node_secs + 2 * dent_secs +