Re: [PATCH 3/3] f2fs: change type for 'sbi->readdir_ra'

[Yuwei Guan]

On 2022/11/14 22:59, Chao Yu wrote:
> On 2022/11/12 16:32, Yuwei Guan wrote:
> > Before this patch, the varibale 'readdir_ra' takes effect if it's equal
> > to '1' or not, so we can change type for it from 'int' to 'bool'.
> >
> > Signed-off-by: Yuwei Guan <Yuwei.Guan@xxxxxxxxxxxxx>
> > ---
> >   fs/f2fs/dir.c   | 7 +++----
> >   fs/f2fs/f2fs.h  | 2 +-
> >   fs/f2fs/super.c | 2 +-
> >   fs/f2fs/sysfs.c | 5 +++++
> >   4 files changed, 10 insertions(+), 6 deletions(-)
> >
> > diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
> > index 21960a899b6a..06d9bf98f5ae 100644
> > --- a/fs/f2fs/dir.c
> > +++ b/fs/f2fs/dir.c
> > @@ -1000,13 +1000,12 @@ int f2fs_fill_dentries(struct dir_context 
> > *ctx, struct f2fs_dentry_ptr *d,
> >       struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
> >       struct f2fs_sb_info *sbi = F2FS_I_SB(d->inode);
> >       struct blk_plug plug;
> > -    bool readdir_ra = sbi->readdir_ra == 1;
> >       bool found_valid_dirent = false;
> >       int err = 0;
> >         bit_pos = ((unsigned long)ctx->pos % d->max);
> >   -    if (readdir_ra)
> > +    if (sbi->readdir_ra)
> >           blk_start_plug(&plug);
> >         while (bit_pos < d->max) {
> > @@ -1064,14 +1063,14 @@ int f2fs_fill_dentries(struct dir_context 
> > *ctx, struct f2fs_dentry_ptr *d,
> >               goto out;
> >           }
> >   -        if (readdir_ra)
> > +        if (sbi->readdir_ra)
> >               f2fs_ra_node_page(sbi, le32_to_cpu(de->ino));
> >             ctx->pos = start_pos + bit_pos;
> >           found_valid_dirent = true;
> >       }
> >   out:
> > -    if (readdir_ra)
> > +    if (sbi->readdir_ra)
>
> I don't think this is the right way... due to below case:
>
> if (sbi->readdir_ra)    // readdir_ra is 1 by default
>     blk_start_plug(&plug);
>
> if (sbi->readdir_ra)    // readdir_ra is updated to 0, it will miss to 
> unplug.
>     blk_finish_plug(&plug);
Hi Chao,

Thanks for the review and pointing it out.

I will update it and send v1.

> Thanks,
>
> >           blk_finish_plug(&plug);
> >       return err;
> >   }
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index e6355a5683b7..384840216e7f 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -1693,7 +1693,7 @@ struct f2fs_sb_info {
> >       unsigned int total_node_count;        /* total node block count */
> >       unsigned int total_valid_node_count;    /* valid node block 
> > count */
> >       int dir_level;                /* directory level */
> > -    int readdir_ra;                /* readahead inode in readdir */
> > +    bool readdir_ra;            /* readahead inode in readdir */
> >       u64 max_io_bytes;            /* max io bytes to merge IOs */
> >         block_t user_block_count;        /* # of user blocks */
> > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> > index f18ae5410b2c..da304861890f 100644
> > --- a/fs/f2fs/super.c
> > +++ b/fs/f2fs/super.c
> > @@ -2202,7 +2202,7 @@ static void f2fs_tuning_parameters(struct 
> > f2fs_sb_info *sbi, bool is_remount)
> >       }
> >         if (!is_remount)
> > -        sbi->readdir_ra = 1;
> > +        sbi->readdir_ra = true;
> >   }
> >     static int f2fs_remount(struct super_block *sb, int *flags, char 
> > *data)
> > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> > index df27afd71ef4..53fbbb87dd0f 100644
> > --- a/fs/f2fs/sysfs.c
> > +++ b/fs/f2fs/sysfs.c
> > @@ -649,6 +649,11 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
> >           return count;
> >       }
> >   +    if (!strcmp(a->attr.name, "readdir_ra")) {
> > +        sbi->readdir_ra = !!t;
> > +        return count;
> > +    }
> > +
> >       *ui = (unsigned int)t;
> >         return count;