Re: [PATCH] f2fs: sysfs: support atgc_enabled

[Jaegeuk Kim <jaegeuk@kernel.org>]

On 07/26, Chao Yu wrote:
> On 2024/2/21 15:32, liujinbao1 wrote:
> > From: liujinbao1 <liujinbao1@xiaomi.com>
> > 
> > When we add "atgc" to the fstab table, ATGC is not immediately enabled.
> > There is a 7-day time threshold, and we can use "atgc_enabled" to
> > show whether ATGC is enabled.
> 
> Oh, I missed to reply on this patch, what about adding this readonly
> atgc_enabled sysfs entry into /sys/fs/f2fs/<dev>/stat/ directory?

It looks like not stat.

> 
> Thanks,
> 
> > 
> > Signed-off-by: liujinbao1 <liujinbao1@xiaomi.com>
> > ---
> >   Documentation/ABI/testing/sysfs-fs-f2fs | 6 ++++++
> >   fs/f2fs/sysfs.c                         | 8 ++++++++
> >   2 files changed, 14 insertions(+)
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> > index 36c3cb547901..8597dfaef700 100644
> > --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> > +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> > @@ -564,6 +564,12 @@ Description:	When ATGC is on, it controls age threshold to bypass GCing young
> >   		candidates whose age is not beyond the threshold, by default it was
> >   		initialized as 604800 seconds (equals to 7 days).
> > +What:		/sys/fs/f2fs/<disk>/atgc_enabled
> > +Date:		Feb 2024
> > +Contact:	"Jinbao Liu" <liujinbao1@xiaomi.com>
> > +Description:	It represents whether ATGC is on or off. The value is 1 which
> > +               indicates that ATGC is on, and 0 indicates that it is off.
> > +
> >   What:		/sys/fs/f2fs/<disk>/gc_reclaimed_segments
> >   Date:		July 2021
> >   Contact:	"Daeho Jeong" <daehojeong@google.com>
> > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> > index 417fae96890f..0915872abd97 100644
> > --- a/fs/f2fs/sysfs.c
> > +++ b/fs/f2fs/sysfs.c
> > @@ -143,6 +143,12 @@ static ssize_t pending_discard_show(struct f2fs_attr *a,
> >   				&SM_I(sbi)->dcc_info->discard_cmd_cnt));
> >   }
> > +static ssize_t atgc_enabled_show(struct f2fs_attr *a,
> > +		struct f2fs_sb_info *sbi, char *buf)
> > +{
> > +	return sysfs_emit(buf, "%d\n", sbi->am.atgc_enabled ? 1 : 0);
> > +}
> > +
> >   static ssize_t gc_mode_show(struct f2fs_attr *a,
> >   		struct f2fs_sb_info *sbi, char *buf)
> >   {
> > @@ -1017,6 +1023,7 @@ F2FS_GENERAL_RO_ATTR(encoding);
> >   F2FS_GENERAL_RO_ATTR(mounted_time_sec);
> >   F2FS_GENERAL_RO_ATTR(main_blkaddr);
> >   F2FS_GENERAL_RO_ATTR(pending_discard);
> > +F2FS_GENERAL_RO_ATTR(atgc_enabled);
> >   F2FS_GENERAL_RO_ATTR(gc_mode);
> >   #ifdef CONFIG_F2FS_STAT_FS
> >   F2FS_GENERAL_RO_ATTR(moved_blocks_background);
> > @@ -1144,6 +1151,7 @@ static struct attribute *f2fs_attrs[] = {
> >   	ATTR_LIST(atgc_candidate_count),
> >   	ATTR_LIST(atgc_age_weight),
> >   	ATTR_LIST(atgc_age_threshold),
> > +	ATTR_LIST(atgc_enabled),
> >   	ATTR_LIST(seq_file_ra_mul),
> >   	ATTR_LIST(gc_segment_mode),
> >   	ATTR_LIST(gc_reclaimed_segments),