f2fs: support file pinning for zoned devices

Support file pinning with conventional storage area for zoned devices

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 61 insertions, 8 deletions

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 471fa7aa053a..01067254ec40 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2640,7 +2640,7 @@ static int is_next_segment_free(struct f2fs_sb_info *sbi,
  * This function should be returned with success, otherwise BUG
  */
 static void get_new_segment(struct f2fs_sb_info *sbi,
-			unsigned int *newseg, bool new_sec)
+			unsigned int *newseg, bool new_sec, bool pinning)
 {
 	struct free_segmap_info *free_i = FREE_I(sbi);
 	unsigned int segno, secno, zoneno;
@@ -2658,6 +2658,16 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
 		if (segno < GET_SEG_FROM_SEC(sbi, hint + 1))
 			goto got_it;
 	}
+
+	/*
+	 * If we format f2fs on zoned storage, let's try to get pinned sections
+	 * from beginning of the storage, which should be a conventional one.
+	 */
+	if (f2fs_sb_has_blkzoned(sbi)) {
+		segno = pinning ? 0 : max(first_zoned_segno(sbi), *newseg);
+		hint = GET_SEC_FROM_SEG(sbi, segno);
+	}
+
 find_other_zone:
 	secno = find_next_zero_bit(free_i->free_secmap, MAIN_SECS(sbi), hint);
 	if (secno >= MAIN_SECS(sbi)) {
@@ -2756,21 +2766,30 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
  * Allocate a current working segment.
  * This function always allocates a free segment in LFS manner.
  */
-static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
+static int new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
 	unsigned int segno = curseg->segno;
+	bool pinning = type == CURSEG_COLD_DATA_PINNED;
 
 	if (curseg->inited)
 		write_sum_page(sbi, curseg->sum_blk, GET_SUM_BLOCK(sbi, segno));
+
 	segno = __get_next_segno(sbi, type);
-	get_new_segment(sbi, &segno, new_sec);
+	get_new_segment(sbi, &segno, new_sec, pinning);
+	if (new_sec && pinning &&
+	    !f2fs_valid_pinned_area(sbi, START_BLOCK(sbi, segno))) {
+		__set_free(sbi, segno);
+		return -EAGAIN;
+	}
+
 	curseg->next_segno = segno;
 	reset_curseg(sbi, type, 1);
 	curseg->alloc_type = LFS;
 	if (F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_BLK)
 		curseg->fragment_remained_chunk =
 				get_random_u32_inclusive(1, sbi->max_fragment_chunk);
+	return 0;
 }
 
 static int __next_free_blkoff(struct f2fs_sb_info *sbi,
@@ -3043,7 +3062,7 @@ unlock:
 	f2fs_up_read(&SM_I(sbi)->curseg_lock);
 }
 
-static void __allocate_new_segment(struct f2fs_sb_info *sbi, int type,
+static int __allocate_new_segment(struct f2fs_sb_info *sbi, int type,
 						bool new_sec, bool force)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
@@ -3053,21 +3072,49 @@ static void __allocate_new_segment(struct f2fs_sb_info *sbi, int type,
 	    !curseg->next_blkoff &&
 	    !get_valid_blocks(sbi, curseg->segno, new_sec) &&
 	    !get_ckpt_valid_blocks(sbi, curseg->segno, new_sec))
-		return;
+		return 0;
 
 	old_segno = curseg->segno;
-	new_curseg(sbi, type, true);
+	if (new_curseg(sbi, type, true))
+		return -EAGAIN;
 	stat_inc_seg_type(sbi, curseg);
 	locate_dirty_segment(sbi, old_segno);
+	return 0;
 }
 
-void f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type, bool force)
+int f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type, bool force)
 {
+	int ret;
+
 	f2fs_down_read(&SM_I(sbi)->curseg_lock);
 	down_write(&SIT_I(sbi)->sentry_lock);
-	__allocate_new_segment(sbi, type, true, force);
+	ret = __allocate_new_segment(sbi, type, true, force);
 	up_write(&SIT_I(sbi)->sentry_lock);
 	f2fs_up_read(&SM_I(sbi)->curseg_lock);
+
+	return ret;
+}
+
+int f2fs_allocate_pinning_section(struct f2fs_sb_info *sbi)
+{
+	int err;
+	bool gc_required = true;
+
+retry:
+	f2fs_lock_op(sbi);
+	err = f2fs_allocate_new_section(sbi, CURSEG_COLD_DATA_PINNED, false);
+	f2fs_unlock_op(sbi);
+
+	if (f2fs_sb_has_blkzoned(sbi) && err && gc_required) {
+		f2fs_down_write(&sbi->gc_lock);
+		f2fs_gc_range(sbi, 0, GET_SEGNO(sbi, FDEV(0).end_blk), true, 1);
+		f2fs_up_write(&sbi->gc_lock);
+
+		gc_required = false;
+		goto retry;
+	}
+
+	return err;
 }
 
 void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi)
@@ -3433,6 +3480,10 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
 	 * new segment.
 	 */
 	if (segment_full) {
+		if (type == CURSEG_COLD_DATA_PINNED &&
+		    !((curseg->segno + 1) % sbi->segs_per_sec))
+			goto skip_new_segment;
+
 		if (from_gc) {
 			get_atssr_segment(sbi, type, se->type,
 						AT_SSR, se->mtime);
@@ -3444,6 +3495,8 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
 			stat_inc_seg_type(sbi, curseg);
 		}
 	}
+
+skip_new_segment:
 	/*
 	 * segment dirty status should be updated after segment allocation,
 	 * so we just need to update status only one time after previous