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Date:   Thu, 27 Feb 2020 09:59:04 -0800
From:   Jaegeuk Kim <jaegeuk@kernel.org>
To:     Chao Yu <yuchao0@huawei.com>
Cc:     linux-kernel@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: show mounted time
Message-ID: <20200227175904.GA33965@google.com>
References: <20200226164615.170424-1-jaegeuk@kernel.org>
 <ace413a8-639d-24c9-f36f-5da949be76e3@huawei.com>
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On 02/27, Chao Yu wrote:
> On 2020/2/27 0:46, Jaegeuk Kim wrote:
> > Let's show mounted time.
> > 
> > Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> > ---
> >  Documentation/ABI/testing/sysfs-fs-f2fs | 5 +++++
> >  fs/f2fs/debug.c                         | 3 +++
> >  fs/f2fs/segment.c                       | 2 +-
> >  fs/f2fs/segment.h                       | 2 +-
> >  fs/f2fs/sysfs.c                         | 8 ++++++++
> >  5 files changed, 18 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> > index 1a6cd5397129..ddee45e88270 100644
> > --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> > +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> > @@ -318,3 +318,8 @@ Date:		September 2019
> >  Contact:	"Hridya Valsaraju" <hridya@google.com>
> >  Description:	Average number of valid blocks.
> >  		Available when CONFIG_F2FS_STAT_FS=y.
> > +
> > +What:		/sys/fs/f2fs/<disk>/mounted_time
> > +Date:		February 2020
> > +Contact:	"Jaegeuk Kim" <jaegeuk@kernel.org>
> > +Description:	Show the mounted time of this partition.
> 
> It's better to describe its unit: second, otherwise, it looks good to me.

I've added it. Thanks.

> 
> Reviewed-by: Chao Yu <yuchao0@huawei.com>
> 
> Thanks,
> 
> > diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
> > index 6b89eae5e4ca..a8cf9626f71f 100644
> > --- a/fs/f2fs/debug.c
> > +++ b/fs/f2fs/debug.c
> > @@ -301,6 +301,9 @@ static int stat_show(struct seq_file *s, void *v)
> >  			   si->ssa_area_segs, si->main_area_segs);
> >  		seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
> >  			   si->overp_segs, si->rsvd_segs);
> > +		seq_printf(s, "Current Time: %llu s / Mounted Time: %llu s\n\n",
> > +					ktime_get_boottime_seconds(),
> > +					SIT_I(si->sbi)->mounted_time);
> >  		if (test_opt(si->sbi, DISCARD))
> >  			seq_printf(s, "Utilization: %u%% (%u valid blocks, %u discard blocks)\n",
> >  				si->utilization, si->valid_count, si->discard_blks);
> > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > index fb3e531a36d2..601d67e72c50 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -4073,7 +4073,7 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
> >  	sit_i->dirty_sentries = 0;
> >  	sit_i->sents_per_block = SIT_ENTRY_PER_BLOCK;
> >  	sit_i->elapsed_time = le64_to_cpu(sbi->ckpt->elapsed_time);
> > -	sit_i->mounted_time = ktime_get_real_seconds();
> > +	sit_i->mounted_time = ktime_get_boottime_seconds();
> >  	init_rwsem(&sit_i->sentry_lock);
> >  	return 0;
> >  }
> > diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
> > index 459dc3901a57..7a83bd530812 100644
> > --- a/fs/f2fs/segment.h
> > +++ b/fs/f2fs/segment.h
> > @@ -756,7 +756,7 @@ static inline unsigned long long get_mtime(struct f2fs_sb_info *sbi,
> >  						bool base_time)
> >  {
> >  	struct sit_info *sit_i = SIT_I(sbi);
> > -	time64_t diff, now = ktime_get_real_seconds();
> > +	time64_t diff, now = ktime_get_boottime_seconds();
> >  
> >  	if (now >= sit_i->mounted_time)
> >  		return sit_i->elapsed_time + now - sit_i->mounted_time;
> > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> > index 4e8aae03f26c..7bfbead98c04 100644
> > --- a/fs/f2fs/sysfs.c
> > +++ b/fs/f2fs/sysfs.c
> > @@ -187,6 +187,12 @@ static ssize_t encoding_show(struct f2fs_attr *a,
> >  	return sprintf(buf, "(none)");
> >  }
> >  
> > +static ssize_t mounted_time_show(struct f2fs_attr *a,
> > +		struct f2fs_sb_info *sbi, char *buf)
> > +{
> > +	return sprintf(buf, "%llu", SIT_I(sbi)->mounted_time);
> > +}
> > +
> >  #ifdef CONFIG_F2FS_STAT_FS
> >  static ssize_t moved_blocks_foreground_show(struct f2fs_attr *a,
> >  				struct f2fs_sb_info *sbi, char *buf)
> > @@ -546,6 +552,7 @@ F2FS_GENERAL_RO_ATTR(features);
> >  F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
> >  F2FS_GENERAL_RO_ATTR(unusable);
> >  F2FS_GENERAL_RO_ATTR(encoding);
> > +F2FS_GENERAL_RO_ATTR(mounted_time);
> >  #ifdef CONFIG_F2FS_STAT_FS
> >  F2FS_STAT_ATTR(STAT_INFO, f2fs_stat_info, cp_foreground_calls, cp_count);
> >  F2FS_STAT_ATTR(STAT_INFO, f2fs_stat_info, cp_background_calls, bg_cp_count);
> > @@ -623,6 +630,7 @@ static struct attribute *f2fs_attrs[] = {
> >  	ATTR_LIST(reserved_blocks),
> >  	ATTR_LIST(current_reserved_blocks),
> >  	ATTR_LIST(encoding),
> > +	ATTR_LIST(mounted_time),
> >  #ifdef CONFIG_F2FS_STAT_FS
> >  	ATTR_LIST(cp_foreground_calls),
> >  	ATTR_LIST(cp_background_calls),
> >