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Date:   Wed, 25 Oct 2017 07:45:25 +0200
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <chao@...nel.org>
Cc:     Chao Yu <yuchao0@...wei.com>,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/6] f2fs: give up CP_TRIMMED_FLAG if it drops discards

On 10/24, Chao Yu wrote:
> On 2017/10/24 20:46, Jaegeuk Kim wrote:
> > On 10/24, Chao Yu wrote:
> >> Hi Jaegeuk,
> >>
> >> On 2017/10/4 9:08, Chao Yu wrote:
> >>> From: Chao Yu <yuchao0@...wei.com>
> >>>
> >>> In ->umount, once we drop remained discard entries, we should not
> >>> set CP_TRIMMED_FLAG with another checkpoint.
> >>>
> >>> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> >>> ---
> >>> v2:
> >>> - rebase on last codes of Jaegeuk's dev-test branch.
> >>>  fs/f2fs/f2fs.h    |  2 +-
> >>>  fs/f2fs/segment.c | 15 +++++++++++----
> >>>  fs/f2fs/super.c   |  5 +++--
> >>>  3 files changed, 15 insertions(+), 7 deletions(-)
> >>>
> >>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> >>> index f274805e231d..c85f49c41003 100644
> >>> --- a/fs/f2fs/f2fs.h
> >>> +++ b/fs/f2fs/f2fs.h
> >>> @@ -2565,7 +2565,7 @@ void init_discard_policy(struct discard_policy *dpolicy, int discard_type,
> >>>  						unsigned int granularity);
> >>>  void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old, block_t new);
> >>>  void stop_discard_thread(struct f2fs_sb_info *sbi);
> >>> -void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi);
> >>> +bool f2fs_wait_discard_bios(struct f2fs_sb_info *sbi);
> >>>  void clear_prefree_segments(struct f2fs_sb_info *sbi, struct cp_control *cpc);
> >>>  void release_discard_addrs(struct f2fs_sb_info *sbi);
> >>>  int npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra);
> >>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> >>> index 4a108321233d..bfbcff8339c5 100644
> >>> --- a/fs/f2fs/segment.c
> >>> +++ b/fs/f2fs/segment.c
> >>> @@ -1196,12 +1196,13 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi,
> >>>  	return issued;
> >>>  }
> >>>  
> >>> -static void __drop_discard_cmd(struct f2fs_sb_info *sbi)
> >>> +static bool __drop_discard_cmd(struct f2fs_sb_info *sbi)
> >>>  {
> >>>  	struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
> >>>  	struct list_head *pend_list;
> >>>  	struct discard_cmd *dc, *tmp;
> >>>  	int i;
> >>> +	bool dropped = false;
> >>>  
> >>>  	mutex_lock(&dcc->cmd_lock);
> >>>  	for (i = MAX_PLIST_NUM - 1; i >= 0; i--) {
> >>> @@ -1209,9 +1210,12 @@ static void __drop_discard_cmd(struct f2fs_sb_info *sbi)
> >>>  		list_for_each_entry_safe(dc, tmp, pend_list, list) {
> >>>  			f2fs_bug_on(sbi, dc->state != D_PREP);
> >>>  			__remove_discard_cmd(sbi, dc);
> >>> +			dropped = true;
> >>>  		}
> >>>  	}
> >>>  	mutex_unlock(&dcc->cmd_lock);
> >>> +
> >>> +	return dropped;
> >>>  }
> >>>  
> >>>  static void __wait_one_discard_bio(struct f2fs_sb_info *sbi,
> >>> @@ -1306,15 +1310,18 @@ void stop_discard_thread(struct f2fs_sb_info *sbi)
> >>>  }
> >>>  
> >>>  /* This comes from f2fs_put_super */
> >>> -void f2fs_wait_discard_bios(struct f2fs_sb_info *sbi)
> >>> +bool f2fs_wait_discard_bios(struct f2fs_sb_info *sbi)
> >>>  {
> >>>  	struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
> >>>  	struct discard_policy dpolicy;
> >>> +	bool dropped;
> >>>  
> >>>  	init_discard_policy(&dpolicy, DPOLICY_UMOUNT, dcc->discard_granularity);
> >>>  	__issue_discard_cmd(sbi, &dpolicy);
> >>> -	__drop_discard_cmd(sbi);
> >>> +	dropped = __drop_discard_cmd(sbi);
> >>>  	__wait_all_discard_cmd(sbi, &dpolicy);
> >>> +
> >>> +	return dropped;
> >>>  }
> >>>  
> >>>  static int issue_discard_thread(void *data)
> >>> @@ -1659,7 +1666,7 @@ void init_discard_policy(struct discard_policy *dpolicy,
> >>>  		dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
> >>>  		dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
> >>>  		dpolicy->io_aware_gran = MAX_PLIST_NUM;
> >>> -		dpolicy->io_aware = false;
> >>> +		dpolicy->io_aware = true;
> >>
> >> I notice this change should not belong to this patch, could you please help to
> >> move this into "f2fs: split discard policy" in your branch?
> > 
> > Yup, done. Could you check it in dev-test?
> 
> I didn't find it, did you forget to push to that branch?

Yup, I pushed it. :)

Thanks,

> 
> Thanks,
> 
> > 
> > Thanks,
> > 
> >>
> >> Thanks,
> >>
> >>>  	} else if (discard_type == DPOLICY_FSTRIM) {
> >>>  		dpolicy->max_requests = DEF_MAX_DISCARD_REQUEST;
> >>>  		dpolicy->io_aware_gran = MAX_PLIST_NUM;
> >>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> >>> index a13269d1a1f0..1d68c18a487b 100644
> >>> --- a/fs/f2fs/super.c
> >>> +++ b/fs/f2fs/super.c
> >>> @@ -807,6 +807,7 @@ static void f2fs_put_super(struct super_block *sb)
> >>>  {
> >>>  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
> >>>  	int i;
> >>> +	bool dropped;
> >>>  
> >>>  	f2fs_quota_off_umount(sb);
> >>>  
> >>> @@ -827,9 +828,9 @@ static void f2fs_put_super(struct super_block *sb)
> >>>  	}
> >>>  
> >>>  	/* be sure to wait for any on-going discard commands */
> >>> -	f2fs_wait_discard_bios(sbi, true);
> >>> +	dropped = f2fs_wait_discard_bios(sbi);
> >>>  
> >>> -	if (f2fs_discard_en(sbi) && !sbi->discard_blks) {
> >>> +	if (f2fs_discard_en(sbi) && !sbi->discard_blks && !dropped) {
> >>>  		struct cp_control cpc = {
> >>>  			.reason = CP_UMOUNT | CP_TRIMMED,
> >>>  		};
> >>>

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