f2fs: remove struct victim_selection default_v_ops

There is only single instance of these ops, and Jaegeuk point out that:

    Originally this was intended to give a chance to provide other
    allocation option. Anyway, it seems quit hard to do it anymore.

So remove the indirection and call f2fs_get_victim() directly.
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -3815,6 +3815,10 @@ void f2fs_build_gc_manager(struct f2fs_sb_info *sbi);
 int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count);
 int __init f2fs_create_garbage_collection_cache(void);
 void f2fs_destroy_garbage_collection_cache(void);
+/* victim selection function for cleaning and SSR */
+int f2fs_get_victim(struct f2fs_sb_info *sbi, unsigned int *result,
+			int gc_type, int type, char alloc_mode,
+			unsigned long long age);
 
 /*
  * recovery.c

fs/f2fs/gc.c

@@ -741,9 +741,9 @@ static int f2fs_gc_pinned_control(struct inode *inode, int gc_type,
  * When it is called from SSR segment selection, it finds a segment
  * which has minimum valid blocks and removes it from dirty seglist.
  */
-static int get_victim_by_default(struct f2fs_sb_info *sbi,
-			unsigned int *result, int gc_type, int type,
-			char alloc_mode, unsigned long long age)
+int f2fs_get_victim(struct f2fs_sb_info *sbi, unsigned int *result,
+			int gc_type, int type, char alloc_mode,
+			unsigned long long age)
 {
 	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
 	struct sit_info *sm = SIT_I(sbi);
@@ -937,10 +937,6 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
 	return ret;
 }
 
-static const struct victim_selection default_v_ops = {
-	.get_victim = get_victim_by_default,
-};
-
 static struct inode *find_gc_inode(struct gc_inode_list *gc_list, nid_t ino)
 {
 	struct inode_entry *ie;
@@ -1671,8 +1667,7 @@ static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
 	int ret;
 
 	down_write(&sit_i->sentry_lock);
-	ret = DIRTY_I(sbi)->v_ops->get_victim(sbi, victim, gc_type,
-					      NO_CHECK_TYPE, LFS, 0);
+	ret = f2fs_get_victim(sbi, victim, gc_type, NO_CHECK_TYPE, LFS, 0);
 	up_write(&sit_i->sentry_lock);
 	return ret;
 }
@@ -1963,8 +1958,6 @@ static void init_atgc_management(struct f2fs_sb_info *sbi)
 
 void f2fs_build_gc_manager(struct f2fs_sb_info *sbi)
 {
-	DIRTY_I(sbi)->v_ops = &default_v_ops;
-
 	sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;
 
 	/* give warm/cold data area from slower device */

fs/f2fs/segment.c

@@ -2875,7 +2875,6 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type,
 				int alloc_mode, unsigned long long age)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
-	const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
 	unsigned segno = NULL_SEGNO;
 	unsigned short seg_type = curseg->seg_type;
 	int i, cnt;
@@ -2884,7 +2883,7 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type,
 	sanity_check_seg_type(sbi, seg_type);
 
 	/* f2fs_need_SSR() already forces to do this */
-	if (!v_ops->get_victim(sbi, &segno, BG_GC, seg_type, alloc_mode, age)) {
+	if (!f2fs_get_victim(sbi, &segno, BG_GC, seg_type, alloc_mode, age)) {
 		curseg->next_segno = segno;
 		return 1;
 	}
@@ -2911,7 +2910,7 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type,
 	for (; cnt-- > 0; reversed ? i-- : i++) {
 		if (i == seg_type)
 			continue;
-		if (!v_ops->get_victim(sbi, &segno, BG_GC, i, alloc_mode, age)) {
+		if (!f2fs_get_victim(sbi, &segno, BG_GC, i, alloc_mode, age)) {
 			curseg->next_segno = segno;
 			return 1;
 		}

fs/f2fs/segment.h

@@ -289,7 +289,6 @@ enum dirty_type {
 };
 
 struct dirty_seglist_info {
-	const struct victim_selection *v_ops;	/* victim selction operation */
 	unsigned long *dirty_segmap[NR_DIRTY_TYPE];
 	unsigned long *dirty_secmap;
 	struct mutex seglist_lock;		/* lock for segment bitmaps */
@@ -300,12 +299,6 @@ struct dirty_seglist_info {
 	bool enable_pin_section;		/* enable pinning section */
 };
 
-/* victim selection function for cleaning and SSR */
-struct victim_selection {
-	int (*get_victim)(struct f2fs_sb_info *, unsigned int *,
-					int, int, char, unsigned long long);
-};
-
 /* for active log information */
 struct curseg_info {
 	struct mutex curseg_mutex;		/* lock for consistency */