linux-kernel - Re: [PATCH] f2fs: Use f2fs_bug_on instead of if condition followed by f2fs_bug

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Date:   Mon, 16 Aug 2021 17:31:18 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Yangtao Li <frank.li@...o.com>
Cc:     chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] f2fs: Use f2fs_bug_on instead of if condition followed
 by f2fs_bug_on

No, I don't think this is a right way.

On 08/16, Yangtao Li wrote:
> Similar:
>     WARNING: Use BUG_ON instead of if condition followed by BUG.
> 
> Let's replace if (cond) f2fs_bug_on() with f2fs_bug_on().
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
>  fs/f2fs/checkpoint.c |  6 ++----
>  fs/f2fs/compress.c   |  3 +--
>  fs/f2fs/data.c       |  6 ++----
>  fs/f2fs/node.h       |  4 +---
>  fs/f2fs/segment.c    |  5 ++---
>  fs/f2fs/segment.h    | 10 ++++------
>  6 files changed, 12 insertions(+), 22 deletions(-)
> 
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 6c208108d69c..eebe5a80b842 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -475,8 +475,7 @@ static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino,
>  	e = radix_tree_lookup(&im->ino_root, ino);
>  	if (!e) {
>  		e = tmp;
> -		if (unlikely(radix_tree_insert(&im->ino_root, ino, e)))
> -			f2fs_bug_on(sbi, 1);
> +		f2fs_bug_on(sbi, radix_tree_insert(&im->ino_root, ino, e));
>  
>  		memset(e, 0, sizeof(struct ino_entry));
>  		e->ino = ino;
> @@ -1369,8 +1368,7 @@ static void commit_checkpoint(struct f2fs_sb_info *sbi,
>  	memcpy(page_address(page), src, PAGE_SIZE);
>  
>  	set_page_dirty(page);
> -	if (unlikely(!clear_page_dirty_for_io(page)))
> -		f2fs_bug_on(sbi, 1);
> +	f2fs_bug_on(sbi, !clear_page_dirty_for_io(page));
>  
>  	/* writeout cp pack 2 page */
>  	err = __f2fs_write_meta_page(page, &wbc, FS_CP_META_IO);
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index 455561826c7d..43362f43c3d2 100644
> --- a/fs/f2fs/compress.c
> +++ b/fs/f2fs/compress.c
> @@ -160,8 +160,7 @@ void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
>  {
>  	unsigned int cluster_ofs;
>  
> -	if (!f2fs_cluster_can_merge_page(cc, page->index))
> -		f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
> +	f2fs_bug_on(F2FS_I_SB(cc->inode), !f2fs_cluster_can_merge_page(cc, page->index));
>  
>  	cluster_ofs = offset_in_cluster(cc, page->index);
>  	cc->rpages[cluster_ofs] = page;
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index d2cf48c5a2e4..4e85d5bcf1bc 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -464,8 +464,7 @@ static inline void __submit_bio(struct f2fs_sb_info *sbi,
>  			zero_user_segment(page, 0, PAGE_SIZE);
>  			set_page_private_dummy(page);
>  
> -			if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE)
> -				f2fs_bug_on(sbi, 1);
> +			f2fs_bug_on(sbi, bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE);
>  		}
>  		/*
>  		 * In the NODE case, we lose next block address chain. So, we
> @@ -727,8 +726,7 @@ static void add_bio_entry(struct f2fs_sb_info *sbi, struct bio *bio,
>  	be->bio = bio;
>  	bio_get(bio);
>  
> -	if (bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE)
> -		f2fs_bug_on(sbi, 1);
> +	f2fs_bug_on(sbi, bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE);
>  
>  	down_write(&io->bio_list_lock);
>  	list_add_tail(&be->list, &io->bio_list);
> diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
> index ff14a6e5ac1c..4acf365771f4 100644
> --- a/fs/f2fs/node.h
> +++ b/fs/f2fs/node.h
> @@ -191,9 +191,7 @@ static inline void get_nat_bitmap(struct f2fs_sb_info *sbi, void *addr)
>  	struct f2fs_nm_info *nm_i = NM_I(sbi);
>  
>  #ifdef CONFIG_F2FS_CHECK_FS
> -	if (memcmp(nm_i->nat_bitmap, nm_i->nat_bitmap_mir,
> -						nm_i->bitmap_size))
> -		f2fs_bug_on(sbi, 1);
> +	f2fs_bug_on(sbi, memcmp(nm_i->nat_bitmap, nm_i->nat_bitmap_mir, nm_i->bitmap_size));
>  #endif
>  	memcpy(addr, nm_i->nat_bitmap, nm_i->bitmap_size);
>  }
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 15cc89eef28d..12f2a9bc15d7 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -4216,9 +4216,8 @@ void f2fs_flush_sit_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
>  
>  			se = get_seg_entry(sbi, segno);
>  #ifdef CONFIG_F2FS_CHECK_FS
> -			if (memcmp(se->cur_valid_map, se->cur_valid_map_mir,
> -						SIT_VBLOCK_MAP_SIZE))
> -				f2fs_bug_on(sbi, 1);
> +			f2fs_bug_on(sbi, memcmp(se->cur_valid_map,
> +				    se->cur_valid_map_mir, SIT_VBLOCK_MAP_SIZE));
>  #endif
>  
>  			/* add discard candidates */
> diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
> index 050230c70a53..c985b889572a 100644
> --- a/fs/f2fs/segment.h
> +++ b/fs/f2fs/segment.h
> @@ -518,9 +518,8 @@ static inline void get_sit_bitmap(struct f2fs_sb_info *sbi,
>  	struct sit_info *sit_i = SIT_I(sbi);
>  
>  #ifdef CONFIG_F2FS_CHECK_FS
> -	if (memcmp(sit_i->sit_bitmap, sit_i->sit_bitmap_mir,
> -						sit_i->bitmap_size))
> -		f2fs_bug_on(sbi, 1);
> +	f2fs_bug_on(sbi, memcmp(sit_i->sit_bitmap, sit_i->sit_bitmap_mir,
> +				sit_i->bitmap_size));
>  #endif
>  	memcpy(dst_addr, sit_i->sit_bitmap, sit_i->bitmap_size);
>  }
> @@ -762,9 +761,8 @@ static inline pgoff_t current_sit_addr(struct f2fs_sb_info *sbi,
>  	check_seg_range(sbi, start);
>  
>  #ifdef CONFIG_F2FS_CHECK_FS
> -	if (f2fs_test_bit(offset, sit_i->sit_bitmap) !=
> -			f2fs_test_bit(offset, sit_i->sit_bitmap_mir))
> -		f2fs_bug_on(sbi, 1);
> +	f2fs_bug_on(sbi, f2fs_test_bit(offset, sit_i->sit_bitmap) !=
> +		    f2fs_test_bit(offset, sit_i->sit_bitmap_mir));
>  #endif
>  
>  	/* calculate sit block address */
> -- 
> 2.32.0