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

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Message-ID: <YD5wQRX+HnltBvEM@google.com>
Date:   Tue, 2 Mar 2021 09:05:05 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com
Subject: Re: [f2fs-dev] [PATCH] f2fs: expose # of overprivision segments

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.

> 
> > 
> > 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);
> >