Re: [PATCH v2] f2fs: add bug_on when f2fs_gc even fails to get one victim

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Agree.

On 2017/11/3 11:44, Jaegeuk Kim wrote:
On 10/13, Yunlong Song wrote:
This can help us to debug on some corner case.

Signed-off-by: Yunlong Song <yunlong.song@xxxxxxxxxx>
Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
  fs/f2fs/gc.c | 6 +++++-
  1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 197ebf4..2b03202 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -986,6 +986,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
  		.ilist = LIST_HEAD_INIT(gc_list.ilist),
  		.iroot = RADIX_TREE_INIT(GFP_NOFS),
  	};
+	bool need_fggc = false;
trace_f2fs_gc_begin(sbi->sb, sync, background,
  				get_pages(sbi, F2FS_DIRTY_NODES),
@@ -1018,8 +1019,10 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
  			if (ret)
  				goto stop;
  		}
-		if (has_not_enough_free_secs(sbi, 0, 0))
+		if (has_not_enough_free_secs(sbi, 0, 0)) {
  			gc_type = FG_GC;
+			need_fggc = true;
+		}
  	}
/* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
@@ -1028,6 +1031,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
  		goto stop;
  	}
  	if (!__get_victim(sbi, &segno, gc_type)) {
+		f2fs_bug_on(sbi, !total_freed && need_fggc);
Just like this?
That's OK.


		f2fs_bug_on(sbi, !total_freed && !sync && gc_type == FG_GC);

  		ret = -ENODATA;
  		goto stop;
  	}
--
1.8.5.2
.


--
Thanks,
Yunlong Song





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