f2fs: allocate memory in batch in build_sit_info()

build_sit_info() allocate all bitmaps for each segment one by one,
it's quite low efficiency, this pach changes to allocate large
continuous memory at a time, and divide it and assign for each bitmaps
of segment. For large size image, it can expect improving its mount
speed.

Signed-off-by: Chen Gong <gongchen4@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/segment.c

@@ -3945,7 +3945,7 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
 	struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 	struct sit_info *sit_i;
 	unsigned int sit_segs, start;
-	char *src_bitmap;
+	char *src_bitmap, *bitmap;
 	unsigned int bitmap_size;
 
 	/* allocate memory for SIT information */
@@ -3968,27 +3968,31 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
 	if (!sit_i->dirty_sentries_bitmap)
 		return -ENOMEM;
 
+#ifdef CONFIG_F2FS_CHECK_FS
+	bitmap_size = MAIN_SEGS(sbi) * SIT_VBLOCK_MAP_SIZE * 4;
+#else
+	bitmap_size = MAIN_SEGS(sbi) * SIT_VBLOCK_MAP_SIZE * 3;
+#endif
+	sit_i->bitmap = f2fs_kvzalloc(sbi, bitmap_size, GFP_KERNEL);
+	if (!sit_i->bitmap)
+		return -ENOMEM;
+
+	bitmap = sit_i->bitmap;
+
 	for (start = 0; start < MAIN_SEGS(sbi); start++) {
-		sit_i->sentries[start].cur_valid_map
-			= f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
-		sit_i->sentries[start].ckpt_valid_map
-			= f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
-		if (!sit_i->sentries[start].cur_valid_map ||
-				!sit_i->sentries[start].ckpt_valid_map)
-			return -ENOMEM;
+		sit_i->sentries[start].cur_valid_map = bitmap;
+		bitmap += SIT_VBLOCK_MAP_SIZE;
+
+		sit_i->sentries[start].ckpt_valid_map = bitmap;
+		bitmap += SIT_VBLOCK_MAP_SIZE;
 
 #ifdef CONFIG_F2FS_CHECK_FS
-		sit_i->sentries[start].cur_valid_map_mir
-			= f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
-		if (!sit_i->sentries[start].cur_valid_map_mir)
-			return -ENOMEM;
+		sit_i->sentries[start].cur_valid_map_mir = bitmap;
+		bitmap += SIT_VBLOCK_MAP_SIZE;
 #endif
 
-		sit_i->sentries[start].discard_map
-			= f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE,
-							GFP_KERNEL);
-		if (!sit_i->sentries[start].discard_map)
-			return -ENOMEM;
+		sit_i->sentries[start].discard_map = bitmap;
+		bitmap += SIT_VBLOCK_MAP_SIZE;
 	}
 
 	sit_i->tmp_map = f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
@@ -4494,21 +4498,12 @@ static void destroy_free_segmap(struct f2fs_sb_info *sbi)
 static void destroy_sit_info(struct f2fs_sb_info *sbi)
 {
 	struct sit_info *sit_i = SIT_I(sbi);
-	unsigned int start;
 
 	if (!sit_i)
 		return;
 
-	if (sit_i->sentries) {
-		for (start = 0; start < MAIN_SEGS(sbi); start++) {
-			kvfree(sit_i->sentries[start].cur_valid_map);
-#ifdef CONFIG_F2FS_CHECK_FS
-			kvfree(sit_i->sentries[start].cur_valid_map_mir);
-#endif
-			kvfree(sit_i->sentries[start].ckpt_valid_map);
-			kvfree(sit_i->sentries[start].discard_map);
-		}
-	}
+	if (sit_i->sentries)
+		kvfree(sit_i->bitmap);
 	kvfree(sit_i->tmp_map);
 
 	kvfree(sit_i->sentries);

fs/f2fs/segment.h

@@ -226,6 +226,7 @@ struct sit_info {
 	block_t sit_base_addr;		/* start block address of SIT area */
 	block_t sit_blocks;		/* # of blocks used by SIT area */
 	block_t written_valid_blocks;	/* # of valid blocks in main area */
+	char *bitmap;			/* all bitmaps pointer */
 	char *sit_bitmap;		/* SIT bitmap pointer */
 #ifdef CONFIG_F2FS_CHECK_FS
 	char *sit_bitmap_mir;		/* SIT bitmap mirror */