linux-kernel - Re: [PATCH 1/3] f2fs: avoid __GFP_NOFAIL in f2fs_bio

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Message-ID: <20200219024928.GA96609@google.com>
Date:   Tue, 18 Feb 2020 18:49:28 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH 1/3] f2fs: avoid __GFP_NOFAIL in f2fs_bio_alloc

On 02/18, Chao Yu wrote:
> __f2fs_bio_alloc() won't fail due to memory pool backend, remove unneeded
> __GFP_NOFAIL flag in __f2fs_bio_alloc().

It it safe for old kernels as well when thinking backports?

> 
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
>  fs/f2fs/data.c | 12 ++++--------
>  fs/f2fs/f2fs.h |  2 +-
>  2 files changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index baf12318ec64..3a4ece26928c 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -54,17 +54,13 @@ static inline struct bio *__f2fs_bio_alloc(gfp_t gfp_mask,
>  	return bio_alloc_bioset(gfp_mask, nr_iovecs, &f2fs_bioset);
>  }
>  
> -struct bio *f2fs_bio_alloc(struct f2fs_sb_info *sbi, int npages, bool no_fail)
> +struct bio *f2fs_bio_alloc(struct f2fs_sb_info *sbi, int npages, bool noio)
>  {
> -	struct bio *bio;
> -
> -	if (no_fail) {
> +	if (noio) {
>  		/* No failure on bio allocation */
> -		bio = __f2fs_bio_alloc(GFP_NOIO, npages);
> -		if (!bio)
> -			bio = __f2fs_bio_alloc(GFP_NOIO | __GFP_NOFAIL, npages);
> -		return bio;
> +		return __f2fs_bio_alloc(GFP_NOIO, npages);
>  	}
> +
>  	if (time_to_inject(sbi, FAULT_ALLOC_BIO)) {
>  		f2fs_show_injection_info(sbi, FAULT_ALLOC_BIO);
>  		return NULL;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 5316ac3eacdf..65f569949d42 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3343,7 +3343,7 @@ void f2fs_destroy_checkpoint_caches(void);
>   */
>  int __init f2fs_init_bioset(void);
>  void f2fs_destroy_bioset(void);
> -struct bio *f2fs_bio_alloc(struct f2fs_sb_info *sbi, int npages, bool no_fail);
> +struct bio *f2fs_bio_alloc(struct f2fs_sb_info *sbi, int npages, bool noio);
>  int f2fs_init_bio_entry_cache(void);
>  void f2fs_destroy_bio_entry_cache(void);
>  void f2fs_submit_bio(struct f2fs_sb_info *sbi,
> -- 
> 2.18.0.rc1