[PATCH] f2fs: add logs in f2fs_disable_checkpoint()

[Chao Yu <chao@kernel.org>]

In order to troubleshoot in which step we may block on during
mount w/ checkpoint_disable mount option.

Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/super.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index c6afdbd6e1cd..ebd93047ebe9 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2640,6 +2640,9 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
 
 	/* check if we need more GC first */
 	unusable = f2fs_get_unusable_blocks(sbi);
+
+	f2fs_info(sbi, "%s starts, unusable: %u", __func__, unusable);
+
 	if (!f2fs_disable_cp_again(sbi, unusable))
 		goto skip_gc;
 
@@ -2647,6 +2650,8 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
 
 	sbi->gc_mode = GC_URGENT_HIGH;
 
+	f2fs_info(sbi, "%s: run f2fs_gc() to migrate blocks", __func__);
+
 	while (!f2fs_time_over(sbi, DISABLE_TIME)) {
 		struct f2fs_gc_control gc_control = {
 			.victim_segno = NULL_SEGNO,
@@ -2667,6 +2672,12 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
 			break;
 	}
 
+	f2fs_info(sbi, "%s: call sync_filesystem() to persist meta: %lld, node: %lld, data: %lld",
+			__func__,
+			get_pages(sbi, F2FS_DIRTY_META),
+			get_pages(sbi, F2FS_DIRTY_NODES),
+			get_pages(sbi, F2FS_DIRTY_DATA));
+
 	ret = sync_filesystem(sbi->sb);
 	if (ret || err) {
 		err = ret ? ret : err;
@@ -2680,6 +2691,12 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
 	}
 
 skip_gc:
+	f2fs_info(sbi, "%s: call f2fs_write_checkpoint(), meta: %lld, node: %lld, data: %lld",
+			__func__,
+			get_pages(sbi, F2FS_DIRTY_META),
+			get_pages(sbi, F2FS_DIRTY_NODES),
+			get_pages(sbi, F2FS_DIRTY_DATA));
+
 	f2fs_down_write_trace(&sbi->gc_lock, &lc);
 	cpc.reason = CP_PAUSE;
 	set_sbi_flag(sbi, SBI_CP_DISABLED);
@@ -2697,7 +2714,7 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
 restore_flag:
 	sbi->gc_mode = gc_mode;
 	sbi->sb->s_flags = s_flags;	/* Restore SB_RDONLY status */
-	f2fs_info(sbi, "f2fs_disable_checkpoint() finish, err:%d", err);
+	f2fs_info(sbi, "%s finishes, err:%d", __func__, err);
 	return err;
 }
 
-- 
2.40.1