linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: expose # of overprivision segments

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Date:   Tue, 2 Mar 2021 10:44:29 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: expose # of overprivision segments

On 03/02, Jaegeuk Kim wrote:
> On 03/02, Chao Yu wrote:
> > On 2021/3/2 13:42, Jaegeuk Kim wrote:
> > > This is useful when checking conditions during checkpoint=disable in Android.
> > 
> > This sysfs entry is readonly, how about putting this at
> > /sys/fs/f2fs/<disk>/stat/?
> 
> Urg.. "stat" is a bit confused. I'll take a look a better ones.

Taking a look at other entries using in Android, I feel that this one can't be
in stat or whatever other location, since I worry about the consistency with
similar dirty/free segments. It seems it's not easy to clean up the existing
ones anymore.

> 
> > 
> > > 
> > > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > > ---
> > >   fs/f2fs/sysfs.c | 8 ++++++++
> > >   1 file changed, 8 insertions(+)
> > > 
> > > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> > > index e38a7f6921dd..254b6fa17406 100644
> > > --- a/fs/f2fs/sysfs.c
> > > +++ b/fs/f2fs/sysfs.c
> > > @@ -91,6 +91,13 @@ static ssize_t free_segments_show(struct f2fs_attr *a,
> > >   			(unsigned long long)(free_segments(sbi)));
> > >   }
> > > +static ssize_t ovp_segments_show(struct f2fs_attr *a,
> > > +		struct f2fs_sb_info *sbi, char *buf)
> > > +{
> > > +	return sprintf(buf, "%llu\n",
> > > +			(unsigned long long)(overprovision_segments(sbi)));
> > > +}
> > > +
> > >   static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
> > >   		struct f2fs_sb_info *sbi, char *buf)
> > >   {
> > > @@ -629,6 +636,7 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, node_io_flag, node_io_flag);
> > >   F2FS_RW_ATTR(CPRC_INFO, ckpt_req_control, ckpt_thread_ioprio, ckpt_thread_ioprio);
> > >   F2FS_GENERAL_RO_ATTR(dirty_segments);
> > >   F2FS_GENERAL_RO_ATTR(free_segments);
> > > +F2FS_GENERAL_RO_ATTR(ovp_segments);
> > 
> > Missed to add document entry in Documentation/ABI/testing/sysfs-fs-f2fs?
> 
> Yeah, thanks.
> 
> > 
> > Thanks,
> > 
> > >   F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
> > >   F2FS_GENERAL_RO_ATTR(features);
> > >   F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
> > > 
> 
> 
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