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Date:   Wed, 15 Jul 2020 12:07:07 -0700
From:   Jaegeuk Kim <jaegeuk@kernel.org>
To:     Chao Yu <yuchao0@huawei.com>
Cc:     linux-f2fs-devel@lists.sourceforge.net,
        linux-kernel@vger.kernel.org, chao@kernel.org
Subject: Re: [PATCH RFC 1/5] f2fs: introduce inmem curseg
Message-ID: <20200715190707.GA2232118@google.com>
References: <20200630100428.19105-1-yuchao0@huawei.com>
 <20200707032106.GA3139161@google.com>
 <f0aee719-1ead-f816-52ec-9f1f913495fa@huawei.com>
 <20200707035142.GB3142230@google.com>
 <a18e3ef5-e93a-a558-a066-829d37bd3cc5@huawei.com>
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On 07/15, Chao Yu wrote:
> On 2020/7/7 11:51, Jaegeuk Kim wrote:
> > On 07/07, Chao Yu wrote:
> >> On 2020/7/7 11:21, Jaegeuk Kim wrote:
> >>> Hi Chao,
> >>>
> >>> Do you have any brief design doc to present the idea?
> >>
> >> Hi Jaegeuk,
> >>
> >> You mean this whole patchset, right?
> >>
> >> I can add a brief design description in patch 0/5.
> > 
> > Yeah, it's a bit hard to understand the whole flow.
> 
> Jaegeuk,
> 
> Do you have time to take a look at this idea summarized in
> [PATCH 0/5]'s cover letter?

Sorry, I couldn't afford to sitting down to review the design.
Let me give it a try soon.

> 
> > 
> > Thanks,
> > 
> >>
> >>>
> >>> Thanks,
> >>>
> >>> On 06/30, Chao Yu wrote:
> >>>> Previous implementation of aligned pinfile allocation will:
> >>>> - allocate new segment on cold data log no matter whether last used
> >>>> segment is partially used or not, it makes IOs more random;
> >>>> - force concurrent cold data/GCed IO going into warm data area, it
> >>>> can make a bad effect on hot/cold data separation;
> >>>>
> >>>> In this patch, we introduce a new type of log named 'inmem curseg',
> >>>> the differents from normal curseg is:
> >>>> - it reuses existed segment type (CURSEG_XXX_NODE/DATA);
> >>>> - it only exists in memory, its segno, blkofs, summary will not b
> >>>>  persisted into checkpoint area;
> >>>>
> >>>> With this new feature, we can enhance scalability of log, special
> >>>> allocators can be created for purposes:
> >>>> - pure lfs allocator for aligned pinfile allocation or file
> >>>> defragmentation
> >>>> - pure ssr allocator for later feature
> >>>>
> >>>> So that, let's update aligned pinfile allocation to use this new
> >>>> inmem curseg fwk.
> >>>>
> >>>> Signed-off-by: Chao Yu <yuchao0@huawei.com>
> >>>> ---
> >>>>  fs/f2fs/checkpoint.c |   7 ++-
> >>>>  fs/f2fs/debug.c      |   6 ++-
> >>>>  fs/f2fs/f2fs.h       |  12 +++--
> >>>>  fs/f2fs/file.c       |   3 +-
> >>>>  fs/f2fs/gc.c         |   2 +-
> >>>>  fs/f2fs/segment.c    | 107 ++++++++++++++++++++++++++++++-------------
> >>>>  fs/f2fs/segment.h    |  17 ++++---
> >>>>  fs/f2fs/super.c      |   9 ++--
> >>>>  8 files changed, 112 insertions(+), 51 deletions(-)
> >>>>
> >>>> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> >>>> index 1bb8278a1c4a..644a914af25a 100644
> >>>> --- a/fs/f2fs/checkpoint.c
> >>>> +++ b/fs/f2fs/checkpoint.c
> >>>> @@ -1623,11 +1623,16 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
> >>>>  
> >>>>  	f2fs_flush_sit_entries(sbi, cpc);
> >>>>  
> >>>> +	/* save inmem log status */
> >>>> +	f2fs_save_inmem_curseg(sbi, CURSEG_COLD_DATA_PINNED);
> >>>> +
> >>>>  	err = do_checkpoint(sbi, cpc);
> >>>>  	if (err)
> >>>>  		f2fs_release_discard_addrs(sbi);
> >>>>  	else
> >>>>  		f2fs_clear_prefree_segments(sbi, cpc);
> >>>> +
> >>>> +	f2fs_restore_inmem_curseg(sbi, CURSEG_COLD_DATA_PINNED);
> >>>>  stop:
> >>>>  	unblock_operations(sbi);
> >>>>  	stat_inc_cp_count(sbi->stat_info);
> >>>> @@ -1658,7 +1663,7 @@ void f2fs_init_ino_entry_info(struct f2fs_sb_info *sbi)
> >>>>  	}
> >>>>  
> >>>>  	sbi->max_orphans = (sbi->blocks_per_seg - F2FS_CP_PACKS -
> >>>> -			NR_CURSEG_TYPE - __cp_payload(sbi)) *
> >>>> +			NR_CURSEG_PERSIST_TYPE - __cp_payload(sbi)) *
> >>>>  				F2FS_ORPHANS_PER_BLOCK;
> >>>>  }
> >>>>  
> >>>> diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
> >>>> index 4276c0f79beb..41a91aa8c262 100644
> >>>> --- a/fs/f2fs/debug.c
> >>>> +++ b/fs/f2fs/debug.c
> >>>> @@ -164,7 +164,7 @@ static void update_general_status(struct f2fs_sb_info *sbi)
> >>>>  		* 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
> >>>>  		/ 2;
> >>>>  	si->util_invalid = 50 - si->util_free - si->util_valid;
> >>>> -	for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
> >>>> +	for (i = CURSEG_HOT_DATA; i < NO_CHECK_TYPE; i++) {
> >>>>  		struct curseg_info *curseg = CURSEG_I(sbi, i);
> >>>>  		si->curseg[i] = curseg->segno;
> >>>>  		si->cursec[i] = GET_SEC_FROM_SEG(sbi, curseg->segno);
> >>>> @@ -393,6 +393,10 @@ static int stat_show(struct seq_file *s, void *v)
> >>>>  			   si->dirty_seg[CURSEG_COLD_NODE],
> >>>>  			   si->full_seg[CURSEG_COLD_NODE],
> >>>>  			   si->valid_blks[CURSEG_COLD_NODE]);
> >>>> +		seq_printf(s, "  - Pinned file: %8d %8d %8d\n",
> >>>> +			   si->curseg[CURSEG_COLD_DATA_PINNED],
> >>>> +			   si->cursec[CURSEG_COLD_DATA_PINNED],
> >>>> +			   si->curzone[CURSEG_COLD_DATA_PINNED]);
> >>>>  		seq_printf(s, "\n  - Valid: %d\n  - Dirty: %d\n",
> >>>>  			   si->main_area_segs - si->dirty_count -
> >>>>  			   si->prefree_count - si->free_segs,
> >>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> >>>> index 7d6c5f8ce16b..f06c77066284 100644
> >>>> --- a/fs/f2fs/f2fs.h
> >>>> +++ b/fs/f2fs/f2fs.h
> >>>> @@ -996,7 +996,9 @@ static inline void set_new_dnode(struct dnode_of_data *dn, struct inode *inode,
> >>>>   */
> >>>>  #define	NR_CURSEG_DATA_TYPE	(3)
> >>>>  #define NR_CURSEG_NODE_TYPE	(3)
> >>>> -#define NR_CURSEG_TYPE	(NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE)
> >>>> +#define NR_CURSEG_INMEM_TYPE	(1)
> >>>> +#define NR_CURSEG_PERSIST_TYPE	(NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE)
> >>>> +#define NR_CURSEG_TYPE		(NR_CURSEG_INMEM_TYPE + NR_CURSEG_PERSIST_TYPE)
> >>>>  
> >>>>  enum {
> >>>>  	CURSEG_HOT_DATA	= 0,	/* directory entry blocks */
> >>>> @@ -1005,8 +1007,10 @@ enum {
> >>>>  	CURSEG_HOT_NODE,	/* direct node blocks of directory files */
> >>>>  	CURSEG_WARM_NODE,	/* direct node blocks of normal files */
> >>>>  	CURSEG_COLD_NODE,	/* indirect node blocks */
> >>>> -	NO_CHECK_TYPE,
> >>>> -	CURSEG_COLD_DATA_PINNED,/* cold data for pinned file */
> >>>> +	NR_PERSISTENT_LOG,	/* number of persistent log */
> >>>> +	CURSEG_COLD_DATA_PINNED = NR_PERSISTENT_LOG,
> >>>> +				/* pinned file that needs consecutive block address */
> >>>> +	NO_CHECK_TYPE,		/* number of persistent & inmem log */
> >>>>  };
> >>>>  
> >>>>  struct flush_cmd {
> >>>> @@ -3359,6 +3363,8 @@ block_t f2fs_get_unusable_blocks(struct f2fs_sb_info *sbi);
> >>>>  int f2fs_disable_cp_again(struct f2fs_sb_info *sbi, block_t unusable);
> >>>>  void f2fs_release_discard_addrs(struct f2fs_sb_info *sbi);
> >>>>  int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra);
> >>>> +void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi, int type);
> >>>> +void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi, int type);
> >>>>  void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
> >>>>  					unsigned int start, unsigned int end);
> >>>>  void f2fs_allocate_new_segment(struct f2fs_sb_info *sbi, int type);
> >>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> >>>> index c10e82806c2a..8611ade06018 100644
> >>>> --- a/fs/f2fs/file.c
> >>>> +++ b/fs/f2fs/file.c
> >>>> @@ -1656,13 +1656,14 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
> >>>>  		}
> >>>>  
> >>>>  		down_write(&sbi->pin_sem);
> >>>> -		map.m_seg_type = CURSEG_COLD_DATA_PINNED;
> >>>>  
> >>>>  		f2fs_lock_op(sbi);
> >>>>  		f2fs_allocate_new_segment(sbi, CURSEG_COLD_DATA);
> >>>>  		f2fs_unlock_op(sbi);
> >>>>  
> >>>> +		map.m_seg_type = CURSEG_COLD_DATA_PINNED;
> >>>>  		err = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_DIO);
> >>>> +
> >>>>  		up_write(&sbi->pin_sem);
> >>>>  
> >>>>  		done += map.m_len;
> >>>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> >>>> index 3b718da69910..84807abe4e00 100644
> >>>> --- a/fs/f2fs/gc.c
> >>>> +++ b/fs/f2fs/gc.c
> >>>> @@ -1448,7 +1448,7 @@ static int free_segment_range(struct f2fs_sb_info *sbi,
> >>>>  	mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
> >>>>  
> >>>>  	/* Move out cursegs from the target range */
> >>>> -	for (type = CURSEG_HOT_DATA; type < NR_CURSEG_TYPE; type++)
> >>>> +	for (type = CURSEG_HOT_DATA; type < NR_CURSEG_PERSIST_TYPE; type++)
> >>>>  		f2fs_allocate_segment_for_resize(sbi, type, start, end);
> >>>>  
> >>>>  	/* do GC to move out valid blocks in the range */
> >>>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> >>>> index 5924b3965ae4..863ec6f1fb87 100644
> >>>> --- a/fs/f2fs/segment.c
> >>>> +++ b/fs/f2fs/segment.c
> >>>> @@ -1958,7 +1958,7 @@ static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
> >>>>  
> >>>>  	mutex_lock(&dirty_i->seglist_lock);
> >>>>  	for_each_set_bit(segno, dirty_i->dirty_segmap[PRE], MAIN_SEGS(sbi))
> >>>> -		__set_test_and_free(sbi, segno);
> >>>> +		__set_test_and_free(sbi, segno, false);
> >>>>  	mutex_unlock(&dirty_i->seglist_lock);
> >>>>  }
> >>>>  
> >>>> @@ -2496,6 +2496,7 @@ static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
> >>>>  	struct curseg_info *curseg = CURSEG_I(sbi, type);
> >>>>  	struct summary_footer *sum_footer;
> >>>>  
> >>>> +	curseg->inited = true;
> >>>>  	curseg->segno = curseg->next_segno;
> >>>>  	curseg->zone = GET_ZONE_FROM_SEG(sbi, curseg->segno);
> >>>>  	curseg->next_blkoff = 0;
> >>>> @@ -2503,24 +2504,31 @@ static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
> >>>>  
> >>>>  	sum_footer = &(curseg->sum_blk->footer);
> >>>>  	memset(sum_footer, 0, sizeof(struct summary_footer));
> >>>> -	if (IS_DATASEG(type))
> >>>> +	if (IS_DATASEG(curseg->seg_type))
> >>>>  		SET_SUM_TYPE(sum_footer, SUM_TYPE_DATA);
> >>>> -	if (IS_NODESEG(type))
> >>>> +	if (IS_NODESEG(curseg->seg_type))
> >>>>  		SET_SUM_TYPE(sum_footer, SUM_TYPE_NODE);
> >>>> -	__set_sit_entry_type(sbi, type, curseg->segno, modified);
> >>>> +	__set_sit_entry_type(sbi, curseg->seg_type, curseg->segno, modified);
> >>>>  }
> >>>>  
> >>>>  static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
> >>>>  {
> >>>> +	struct curseg_info *curseg = CURSEG_I(sbi, type);
> >>>> +
> >>>>  	/* if segs_per_sec is large than 1, we need to keep original policy. */
> >>>>  	if (__is_large_section(sbi))
> >>>> -		return CURSEG_I(sbi, type)->segno;
> >>>> +		return curseg->segno;
> >>>> +
> >>>> +	/* inmem log may not locate on any segment after mount */
> >>>> +	if (!curseg->inited)
> >>>> +		return 0;
> >>>>  
> >>>>  	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
> >>>>  		return 0;
> >>>>  
> >>>>  	if (test_opt(sbi, NOHEAP) &&
> >>>> -		(type == CURSEG_HOT_DATA || IS_NODESEG(type)))
> >>>> +		(curseg->seg_type == CURSEG_HOT_DATA ||
> >>>> +		IS_NODESEG(curseg->seg_type)))
> >>>>  		return 0;
> >>>>  
> >>>>  	if (SIT_I(sbi)->last_victim[ALLOC_NEXT])
> >>>> @@ -2530,7 +2538,7 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
> >>>>  	if (F2FS_OPTION(sbi).alloc_mode == ALLOC_MODE_REUSE)
> >>>>  		return 0;
> >>>>  
> >>>> -	return CURSEG_I(sbi, type)->segno;
> >>>> +	return curseg->segno;
> >>>>  }
> >>>>  
> >>>>  /*
> >>>> @@ -2540,12 +2548,14 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
> >>>>  static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
> >>>>  {
> >>>>  	struct curseg_info *curseg = CURSEG_I(sbi, type);
> >>>> +	unsigned short seg_type = curseg->seg_type;
> >>>>  	unsigned int segno = curseg->segno;
> >>>>  	int dir = ALLOC_LEFT;
> >>>>  
> >>>> -	write_sum_page(sbi, curseg->sum_blk,
> >>>> +	if (curseg->inited)
> >>>> +		write_sum_page(sbi, curseg->sum_blk,
> >>>>  				GET_SUM_BLOCK(sbi, segno));
> >>>> -	if (type == CURSEG_WARM_DATA || type == CURSEG_COLD_DATA)
> >>>> +	if (seg_type == CURSEG_WARM_DATA || seg_type == CURSEG_COLD_DATA)
> >>>>  		dir = ALLOC_RIGHT;
> >>>>  
> >>>>  	if (test_opt(sbi, NOHEAP))
> >>>> @@ -2622,6 +2632,43 @@ static void change_curseg(struct f2fs_sb_info *sbi, int type)
> >>>>  	f2fs_put_page(sum_page, 1);
> >>>>  }
> >>>>  
> >>>> +void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi, int type)
> >>>> +{
> >>>> +	struct curseg_info *curseg = CURSEG_I(sbi, type);
> >>>> +
> >>>> +	mutex_lock(&curseg->curseg_mutex);
> >>>> +	if (!curseg->inited)
> >>>> +		goto out;
> >>>> +
> >>>> +	if (get_valid_blocks(sbi, curseg->segno, false)) {
> >>>> +		write_sum_page(sbi, curseg->sum_blk,
> >>>> +				GET_SUM_BLOCK(sbi, curseg->segno));
> >>>> +	} else {
> >>>> +		mutex_lock(&DIRTY_I(sbi)->seglist_lock);
> >>>> +		__set_test_and_free(sbi, curseg->segno, true);
> >>>> +		mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
> >>>> +	}
> >>>> +out:
> >>>> +	mutex_unlock(&curseg->curseg_mutex);
> >>>> +}
> >>>> +
> >>>> +void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi, int type)
> >>>> +{
> >>>> +	struct curseg_info *curseg = CURSEG_I(sbi, type);
> >>>> +
> >>>> +	mutex_lock(&curseg->curseg_mutex);
> >>>> +	if (!curseg->inited)
> >>>> +		goto out;
> >>>> +	if (get_valid_blocks(sbi, curseg->segno, false))
> >>>> +		goto out;
> >>>> +
> >>>> +	mutex_lock(&DIRTY_I(sbi)->seglist_lock);
> >>>> +	__set_test_and_inuse(sbi, curseg->segno);
> >>>> +	mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
> >>>> +out:
> >>>> +	mutex_unlock(&curseg->curseg_mutex);
> >>>> +}
> >>>> +
> >>>>  static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
> >>>>  {
> >>>>  	struct curseg_info *curseg = CURSEG_I(sbi, type);
> >>>> @@ -2738,11 +2785,15 @@ void __allocate_new_segment(struct f2fs_sb_info *sbi, int type)
> >>>>  	struct curseg_info *curseg = CURSEG_I(sbi, type);
> >>>>  	unsigned int old_segno;
> >>>>  
> >>>> +	if (!curseg->inited)
> >>>> +		goto alloc;
> >>>> +
> >>>>  	if (!curseg->next_blkoff &&
> >>>>  		!get_valid_blocks(sbi, curseg->segno, false) &&
> >>>>  		!get_ckpt_valid_blocks(sbi, curseg->segno))
> >>>>  		return;
> >>>>  
> >>>> +alloc:
> >>>>  	old_segno = curseg->segno;
> >>>>  	SIT_I(sbi)->s_ops->allocate_segment(sbi, type, true);
> >>>>  	locate_dirty_segment(sbi, old_segno);
> >>>> @@ -3126,19 +3177,6 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
> >>>>  {
> >>>>  	struct sit_info *sit_i = SIT_I(sbi);
> >>>>  	struct curseg_info *curseg = CURSEG_I(sbi, type);
> >>>> -	bool put_pin_sem = false;
> >>>> -
> >>>> -	if (type == CURSEG_COLD_DATA) {
> >>>> -		/* GC during CURSEG_COLD_DATA_PINNED allocation */
> >>>> -		if (down_read_trylock(&sbi->pin_sem)) {
> >>>> -			put_pin_sem = true;
> >>>> -		} else {
> >>>> -			type = CURSEG_WARM_DATA;
> >>>> -			curseg = CURSEG_I(sbi, type);
> >>>> -		}
> >>>> -	} else if (type == CURSEG_COLD_DATA_PINNED) {
> >>>> -		type = CURSEG_COLD_DATA;
> >>>> -	}
> >>>>  
> >>>>  	down_read(&SM_I(sbi)->curseg_lock);
> >>>>  
> >>>> @@ -3204,9 +3242,6 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
> >>>>  	mutex_unlock(&curseg->curseg_mutex);
> >>>>  
> >>>>  	up_read(&SM_I(sbi)->curseg_lock);
> >>>> -
> >>>> -	if (put_pin_sem)
> >>>> -		up_read(&sbi->pin_sem);
> >>>>  }
> >>>>  
> >>>>  static void update_device_state(struct f2fs_io_info *fio)
> >>>> @@ -3574,7 +3609,7 @@ static int read_normal_summaries(struct f2fs_sb_info *sbi, int type)
> >>>>  		blk_off = le16_to_cpu(ckpt->cur_data_blkoff[type -
> >>>>  							CURSEG_HOT_DATA]);
> >>>>  		if (__exist_node_summaries(sbi))
> >>>> -			blk_addr = sum_blk_addr(sbi, NR_CURSEG_TYPE, type);
> >>>> +			blk_addr = sum_blk_addr(sbi, NR_CURSEG_PERSIST_TYPE, type);
> >>>>  		else
> >>>>  			blk_addr = sum_blk_addr(sbi, NR_CURSEG_DATA_TYPE, type);
> >>>>  	} else {
> >>>> @@ -3652,8 +3687,9 @@ static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
> >>>>  	}
> >>>>  
> >>>>  	if (__exist_node_summaries(sbi))
> >>>> -		f2fs_ra_meta_pages(sbi, sum_blk_addr(sbi, NR_CURSEG_TYPE, type),
> >>>> -					NR_CURSEG_TYPE - type, META_CP, true);
> >>>> +		f2fs_ra_meta_pages(sbi,
> >>>> +				sum_blk_addr(sbi, NR_CURSEG_PERSIST_TYPE, type),
> >>>> +				NR_CURSEG_PERSIST_TYPE - type, META_CP, true);
> >>>>  
> >>>>  	for (; type <= CURSEG_COLD_NODE; type++) {
> >>>>  		err = read_normal_summaries(sbi, type);
> >>>> @@ -4155,14 +4191,14 @@ static int build_curseg(struct f2fs_sb_info *sbi)
> >>>>  	struct curseg_info *array;
> >>>>  	int i;
> >>>>  
> >>>> -	array = f2fs_kzalloc(sbi, array_size(NR_CURSEG_TYPE, sizeof(*array)),
> >>>> -			     GFP_KERNEL);
> >>>> +	array = f2fs_kzalloc(sbi, array_size(NR_CURSEG_TYPE,
> >>>> +					sizeof(*array)), GFP_KERNEL);
> >>>>  	if (!array)
> >>>>  		return -ENOMEM;
> >>>>  
> >>>>  	SM_I(sbi)->curseg_array = array;
> >>>>  
> >>>> -	for (i = 0; i < NR_CURSEG_TYPE; i++) {
> >>>> +	for (i = 0; i < NO_CHECK_TYPE; i++) {
> >>>>  		mutex_init(&array[i].curseg_mutex);
> >>>>  		array[i].sum_blk = f2fs_kzalloc(sbi, PAGE_SIZE, GFP_KERNEL);
> >>>>  		if (!array[i].sum_blk)
> >>>> @@ -4172,8 +4208,13 @@ static int build_curseg(struct f2fs_sb_info *sbi)
> >>>>  				sizeof(struct f2fs_journal), GFP_KERNEL);
> >>>>  		if (!array[i].journal)
> >>>>  			return -ENOMEM;
> >>>> +		if (i < NR_PERSISTENT_LOG)
> >>>> +			array[i].seg_type = CURSEG_HOT_DATA + i;
> >>>> +		else if (i == CURSEG_COLD_DATA_PINNED)
> >>>> +			array[i].seg_type = CURSEG_COLD_DATA;
> >>>>  		array[i].segno = NULL_SEGNO;
> >>>>  		array[i].next_blkoff = 0;
> >>>> +		array[i].inited = false;
> >>>>  	}
> >>>>  	return restore_curseg_summaries(sbi);
> >>>>  }
> >>>> @@ -4408,7 +4449,7 @@ static int sanity_check_curseg(struct f2fs_sb_info *sbi)
> >>>>  	 * In LFS/SSR curseg, .next_blkoff should point to an unused blkaddr;
> >>>>  	 * In LFS curseg, all blkaddr after .next_blkoff should be unused.
> >>>>  	 */
> >>>> -	for (i = 0; i < NO_CHECK_TYPE; i++) {
> >>>> +	for (i = 0; i < NR_PERSISTENT_LOG; i++) {
> >>>>  		struct curseg_info *curseg = CURSEG_I(sbi, i);
> >>>>  		struct seg_entry *se = get_seg_entry(sbi, curseg->segno);
> >>>>  		unsigned int blkofs = curseg->next_blkoff;
> >>>> @@ -4637,7 +4678,7 @@ int f2fs_fix_curseg_write_pointer(struct f2fs_sb_info *sbi)
> >>>>  {
> >>>>  	int i, ret;
> >>>>  
> >>>> -	for (i = 0; i < NO_CHECK_TYPE; i++) {
> >>>> +	for (i = 0; i < NR_PERSISTENT_LOG; i++) {
> >>>>  		ret = fix_curseg_write_pointer(sbi, i);
> >>>>  		if (ret)
> >>>>  			return ret;
> >>>> diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
> >>>> index f261e3e6a69b..8ff261550cbb 100644
> >>>> --- a/fs/f2fs/segment.h
> >>>> +++ b/fs/f2fs/segment.h
> >>>> @@ -22,7 +22,7 @@
> >>>>  #define GET_R2L_SEGNO(free_i, segno)	((segno) + (free_i)->start_segno)
> >>>>  
> >>>>  #define IS_DATASEG(t)	((t) <= CURSEG_COLD_DATA)
> >>>> -#define IS_NODESEG(t)	((t) >= CURSEG_HOT_NODE)
> >>>> +#define IS_NODESEG(t)	((t) >= CURSEG_HOT_NODE && (t) <= CURSEG_COLD_NODE)
> >>>>  
> >>>>  #define IS_HOT(t)	((t) == CURSEG_HOT_NODE || (t) == CURSEG_HOT_DATA)
> >>>>  #define IS_WARM(t)	((t) == CURSEG_WARM_NODE || (t) == CURSEG_WARM_DATA)
> >>>> @@ -34,7 +34,8 @@
> >>>>  	 ((seg) == CURSEG_I(sbi, CURSEG_COLD_DATA)->segno) ||	\
> >>>>  	 ((seg) == CURSEG_I(sbi, CURSEG_HOT_NODE)->segno) ||	\
> >>>>  	 ((seg) == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno) ||	\
> >>>> -	 ((seg) == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno))
> >>>> +	 ((seg) == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno) ||	\
> >>>> +	 ((seg) == CURSEG_I(sbi, CURSEG_COLD_DATA_PINNED)->segno))
> >>>>  
> >>>>  #define IS_CURSEC(sbi, secno)						\
> >>>>  	(((secno) == CURSEG_I(sbi, CURSEG_HOT_DATA)->segno /		\
> >>>> @@ -48,7 +49,9 @@
> >>>>  	 ((secno) == CURSEG_I(sbi, CURSEG_WARM_NODE)->segno /		\
> >>>>  	  (sbi)->segs_per_sec) ||	\
> >>>>  	 ((secno) == CURSEG_I(sbi, CURSEG_COLD_NODE)->segno /		\
> >>>> -	  (sbi)->segs_per_sec))	\
> >>>> +	  (sbi)->segs_per_sec) ||	\
> >>>> +	 ((secno) == CURSEG_I(sbi, CURSEG_COLD_DATA_PINNED)->segno /	\
> >>>> +	  (sbi)->segs_per_sec))
> >>>>  
> >>>>  #define MAIN_BLKADDR(sbi)						\
> >>>>  	(SM_I(sbi) ? SM_I(sbi)->main_blkaddr : 				\
> >>>> @@ -288,10 +291,12 @@ struct curseg_info {
> >>>>  	struct rw_semaphore journal_rwsem;	/* protect journal area */
> >>>>  	struct f2fs_journal *journal;		/* cached journal info */
> >>>>  	unsigned char alloc_type;		/* current allocation type */
> >>>> +	unsigned short seg_type;		/* segment type like CURSEG_XXX_TYPE */
> >>>>  	unsigned int segno;			/* current segment number */
> >>>>  	unsigned short next_blkoff;		/* next block offset to write */
> >>>>  	unsigned int zone;			/* current zone number */
> >>>>  	unsigned int next_segno;		/* preallocated segment */
> >>>> +	bool inited;				/* indicate inmem log is inited */
> >>>>  };
> >>>>  
> >>>>  struct sit_entry_set {
> >>>> @@ -305,8 +310,6 @@ struct sit_entry_set {
> >>>>   */
> >>>>  static inline struct curseg_info *CURSEG_I(struct f2fs_sb_info *sbi, int type)
> >>>>  {
> >>>> -	if (type == CURSEG_COLD_DATA_PINNED)
> >>>> -		type = CURSEG_COLD_DATA;
> >>>>  	return (struct curseg_info *)(SM_I(sbi)->curseg_array + type);
> >>>>  }
> >>>>  
> >>>> @@ -438,7 +441,7 @@ static inline void __set_inuse(struct f2fs_sb_info *sbi,
> >>>>  }
> >>>>  
> >>>>  static inline void __set_test_and_free(struct f2fs_sb_info *sbi,
> >>>> -		unsigned int segno)
> >>>> +		unsigned int segno, bool inmem)
> >>>>  {
> >>>>  	struct free_segmap_info *free_i = FREE_I(sbi);
> >>>>  	unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
> >>>> @@ -449,7 +452,7 @@ static inline void __set_test_and_free(struct f2fs_sb_info *sbi,
> >>>>  	if (test_and_clear_bit(segno, free_i->free_segmap)) {
> >>>>  		free_i->free_segments++;
> >>>>  
> >>>> -		if (IS_CURSEC(sbi, secno))
> >>>> +		if (!inmem && IS_CURSEC(sbi, secno))
> >>>>  			goto skip_free;
> >>>>  		next = find_next_bit(free_i->free_segmap,
> >>>>  				start_segno + sbi->segs_per_sec, start_segno);
> >>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> >>>> index 80cb7cd358f8..0fefa130585f 100644
> >>>> --- a/fs/f2fs/super.c
> >>>> +++ b/fs/f2fs/super.c
> >>>> @@ -575,7 +575,8 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
> >>>>  		case Opt_active_logs:
> >>>>  			if (args->from && match_int(args, &arg))
> >>>>  				return -EINVAL;
> >>>> -			if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
> >>>> +			if (arg != 2 && arg != 4 &&
> >>>> +				arg != NR_CURSEG_PERSIST_TYPE)
> >>>>  				return -EINVAL;
> >>>>  			F2FS_OPTION(sbi).active_logs = arg;
> >>>>  			break;
> >>>> @@ -981,7 +982,7 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
> >>>>  	}
> >>>>  
> >>>>  	/* Not pass down write hints if the number of active logs is lesser
> >>>> -	 * than NR_CURSEG_TYPE.
> >>>> +	 * than NR_CURSEG_PERSIST_TYPE.
> >>>>  	 */
> >>>>  	if (F2FS_OPTION(sbi).active_logs != NR_CURSEG_TYPE)
> >>>>  		F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
> >>>> @@ -1614,7 +1615,7 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
> >>>>  static void default_options(struct f2fs_sb_info *sbi)
> >>>>  {
> >>>>  	/* init some FS parameters */
> >>>> -	F2FS_OPTION(sbi).active_logs = NR_CURSEG_TYPE;
> >>>> +	F2FS_OPTION(sbi).active_logs = NR_CURSEG_PERSIST_TYPE;
> >>>>  	F2FS_OPTION(sbi).inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
> >>>>  	F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
> >>>>  	F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
> >>>> @@ -2946,7 +2947,7 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
> >>>>  	cp_payload = __cp_payload(sbi);
> >>>>  	if (cp_pack_start_sum < cp_payload + 1 ||
> >>>>  		cp_pack_start_sum > blocks_per_seg - 1 -
> >>>> -			NR_CURSEG_TYPE) {
> >>>> +			NR_CURSEG_PERSIST_TYPE) {
> >>>>  		f2fs_err(sbi, "Wrong cp_pack_start_sum: %u",
> >>>>  			 cp_pack_start_sum);
> >>>>  		return 1;
> >>>> -- 
> >>>> 2.26.2
> >>> .
> >>>
> > .
> >