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SubjectRe: [PATCH] f2fs: add bug_on when f2fs_gc even fails to get one victim
Hi Yunlong,

On 10/11, Yunlong Song wrote:
> This can help us to debug on some corner case.
>
> Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
> ---
> 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..960503e 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_gc = 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_gc = 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_gc);

How about this, if this is for debugging purpose?

if (!total_freed && need_gc)
f2fs_msg(...);

It's not a good way to define a value for f2fs_bug_on(), since it is only
activated by CHECK_FS config.

Thanks,

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

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