Message-ID: <dbd58878-3de2-7636-1d78-d1dc630a2176@kernel.org>
Date:   Thu, 29 Jul 2021 09:41:59 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     Chao Yu <chao.yu@...ux.dev>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [RFC NO MERGE] f2fs: extent cache: support unaligned
 extent

Ping,

On 2021/7/20 8:39, Chao Yu wrote:
> On 2021/7/20 2:36, Jaegeuk Kim wrote:
>> On 07/07, Chao Yu wrote:
>>> Compressed inode may suffer read performance issue due to it can not
>>> use extent cache, so I propose to add this unaligned extent support
>>> to improve it.
>>>
>>> Currently, it only works in readonly format f2fs image.
>>>
>>> Unaligned extent: in one compressed cluster, physical block number
>>> will be less than logical block number, so we add an extra physical
>>> block length in extent info in order to indicate such extent status.
>>>
>>> The idea is if one whole cluster blocks are contiguous physically,
>>> once its mapping info was readed at first time, we will cache an
>>> unaligned (or aligned) extent info entry in extent cache, it expects
>>> that the mapping info will be hitted when rereading cluster.
>>
>> How about just modifying to handle COMPRESS_ADDR when modifying the extent_cache
>> like RO case?
> 
> IIUC, update_largest_extent() in sload tries to find largest non-compressed cluster,
> and persist its extent into inode, for a compressed file, non-compressed cluster is
> not a common case, so I guess it's valuable to handle compressed cluster mapping
> in extent cache to enhance read performance, especially for inode which has large
> sized cluster.
> 
> Let me if I misunderstood what you mean.
> 
> Thanks,
> 
>>
>>>
>>> Merge policy:
>>> - Aligned extents can be merged.
>>> - Aligned extent and unaligned extent can not be merged.
>>>
>>> Signed-off-by: Chao Yu <chao@...nel.org>
>>> ---
>>>
>>> I just post this for comments, it passes compiling, w/o any test.
>>>
>>>    fs/f2fs/compress.c     | 25 ++++++++++++
>>>    fs/f2fs/data.c         | 38 +++++++++++++-----
>>>    fs/f2fs/extent_cache.c | 90 +++++++++++++++++++++++++++++++++++++-----
>>>    fs/f2fs/f2fs.h         | 33 +++++++++++++---
>>>    fs/f2fs/node.c         | 20 ++++++++++
>>>    5 files changed, 181 insertions(+), 25 deletions(-)
>>>
>>> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
>>> index 455561826c7d..f072ac33eba5 100644
>>> --- a/fs/f2fs/compress.c
>>> +++ b/fs/f2fs/compress.c
>>> @@ -1666,6 +1666,31 @@ void f2fs_put_page_dic(struct page *page)
>>>    	f2fs_put_dic(dic);
>>>    }
>>>    
>>> +/*
>>> + * check whether cluster blocks are contiguous, and add extent cache entry
>>> + * only if cluster blocks are logically and physically contiguous.
>>> + */
>>> +int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn)
>>> +{
>>> +	bool compressed = f2fs_data_blkaddr(dn) == COMPRESS_ADDR;
>>> +	int i = compressed ? 1 : 0;
>>> +	block_t first_blkaddr = data_blkaddr(dn->inode, dn->node_page,
>>> +						dn->ofs_in_node + i);
>>> +
>>> +	for (i += 1; i < F2FS_I(dn->inode)->i_cluster_size; i++) {
>>> +		block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
>>> +						dn->ofs_in_node + i);
>>> +
>>> +		if (!__is_valid_data_blkaddr(blkaddr))
>>> +			break;
>>> +		if (first_blkaddr + i - 1 != blkaddr)
>>> +			return 0;
>>> +	}
>>> +
>>> +	return compressed ? i - 1 : i;
>>> +}
>>> +
>>> +
>>>    const struct address_space_operations f2fs_compress_aops = {
>>>    	.releasepage = f2fs_release_page,
>>>    	.invalidatepage = f2fs_invalidate_page,
>>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>>> index d2cf48c5a2e4..9572d78da4d7 100644
>>> --- a/fs/f2fs/data.c
>>> +++ b/fs/f2fs/data.c
>>> @@ -2115,6 +2115,8 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>>>    	sector_t last_block_in_file;
>>>    	const unsigned blocksize = blks_to_bytes(inode, 1);
>>>    	struct decompress_io_ctx *dic = NULL;
>>> +	struct extent_info_unaligned eiu;
>>> +	bool extent_cache = false;
>>>    	int i;
>>>    	int ret = 0;
>>>    
>>> @@ -2145,18 +2147,26 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>>>    	if (f2fs_cluster_is_empty(cc))
>>>    		goto out;
>>>    
>>> -	set_new_dnode(&dn, inode, NULL, NULL, 0);
>>> -	ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
>>> -	if (ret)
>>> -		goto out;
>>> +	if (f2fs_lookup_extent_cache_unaligned(inode, start_idx, &eiu))
>>> +		extent_cache = true;
>>>    
>>> -	f2fs_bug_on(sbi, dn.data_blkaddr != COMPRESS_ADDR);
>>> +	if (!extent_cache) {
>>> +		set_new_dnode(&dn, inode, NULL, NULL, 0);
>>> +		ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
>>> +		if (ret)
>>> +			goto out;
>>> +
>>> +		f2fs_bug_on(sbi, dn.data_blkaddr != COMPRESS_ADDR);
>>> +	}
>>>    
>>>    	for (i = 1; i < cc->cluster_size; i++) {
>>>    		block_t blkaddr;
>>>    
>>> -		blkaddr = data_blkaddr(dn.inode, dn.node_page,
>>> -						dn.ofs_in_node + i);
>>> +		if (extent_cache)
>>> +			blkaddr = eiu.ei.blk + i;
>>> +		else
>>> +			blkaddr = data_blkaddr(dn.inode, dn.node_page,
>>> +							dn.ofs_in_node + i);
>>>    
>>>    		if (!__is_valid_data_blkaddr(blkaddr))
>>>    			break;
>>> @@ -2166,6 +2176,9 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>>>    			goto out_put_dnode;
>>>    		}
>>>    		cc->nr_cpages++;
>>> +
>>> +		if (extent_cache && i >= eiu.plen)
>>> +			break;
>>>    	}
>>>    
>>>    	/* nothing to decompress */
>>> @@ -2185,7 +2198,10 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>>>    		block_t blkaddr;
>>>    		struct bio_post_read_ctx *ctx;
>>>    
>>> -		blkaddr = data_blkaddr(dn.inode, dn.node_page,
>>> +		if (extent_cache)
>>> +			blkaddr = eiu.plen + i + 1;
>>> +		else
>>> +			blkaddr = data_blkaddr(dn.inode, dn.node_page,
>>>    						dn.ofs_in_node + i + 1);
>>>    
>>>    		f2fs_wait_on_block_writeback(inode, blkaddr);
>>> @@ -2231,13 +2247,15 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>>>    		*last_block_in_bio = blkaddr;
>>>    	}
>>>    
>>> -	f2fs_put_dnode(&dn);
>>> +	if (!extent_cache)
>>> +		f2fs_put_dnode(&dn);
>>>    
>>>    	*bio_ret = bio;
>>>    	return 0;
>>>    
>>>    out_put_dnode:
>>> -	f2fs_put_dnode(&dn);
>>> +	if (!extent_cache)
>>> +		f2fs_put_dnode(&dn);
>>>    out:
>>>    	for (i = 0; i < cc->cluster_size; i++) {
>>>    		if (cc->rpages[i]) {
>>> diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
>>> index 3ebf976a682d..db9de95f90dc 100644
>>> --- a/fs/f2fs/extent_cache.c
>>> +++ b/fs/f2fs/extent_cache.c
>>> @@ -235,7 +235,7 @@ static struct kmem_cache *extent_node_slab;
>>>    static struct extent_node *__attach_extent_node(struct f2fs_sb_info *sbi,
>>>    				struct extent_tree *et, struct extent_info *ei,
>>>    				struct rb_node *parent, struct rb_node **p,
>>> -				bool leftmost)
>>> +				bool leftmost, bool unaligned)
>>>    {
>>>    	struct extent_node *en;
>>>    
>>> @@ -247,6 +247,11 @@ static struct extent_node *__attach_extent_node(struct f2fs_sb_info *sbi,
>>>    	INIT_LIST_HEAD(&en->list);
>>>    	en->et = et;
>>>    
>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>> +	if (unaligned)
>>> +		en->plen = ((struct extent_info_unaligned *)ei)->plen;
>>> +#endif
>>> +
>>>    	rb_link_node(&en->rb_node, parent, p);
>>>    	rb_insert_color_cached(&en->rb_node, &et->root, leftmost);
>>>    	atomic_inc(&et->node_cnt);
>>> @@ -320,7 +325,7 @@ static struct extent_node *__init_extent_tree(struct f2fs_sb_info *sbi,
>>>    	struct rb_node **p = &et->root.rb_root.rb_node;
>>>    	struct extent_node *en;
>>>    
>>> -	en = __attach_extent_node(sbi, et, ei, NULL, p, true);
>>> +	en = __attach_extent_node(sbi, et, ei, NULL, p, true, false);
>>>    	if (!en)
>>>    		return NULL;
>>>    
>>> @@ -439,6 +444,17 @@ static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs,
>>>    		stat_inc_rbtree_node_hit(sbi);
>>>    
>>>    	*ei = en->ei;
>>> +
>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>> +	if (is_inode_flag_set(inode, FI_COMPRESSED_FILE) &&
>>> +				!f2fs_sb_has_readonly(sbi)) {
>>> +		struct extent_info_unaligned *eiu =
>>> +				(struct extent_info_unaligned *)ei;
>>> +
>>> +		eiu->plen = en->plen;
>>> +	}
>>> +#endif
>>> +
>>>    	spin_lock(&sbi->extent_lock);
>>>    	if (!list_empty(&en->list)) {
>>>    		list_move_tail(&en->list, &sbi->extent_list);
>>> @@ -457,17 +473,18 @@ static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs,
>>>    static struct extent_node *__try_merge_extent_node(struct f2fs_sb_info *sbi,
>>>    				struct extent_tree *et, struct extent_info *ei,
>>>    				struct extent_node *prev_ex,
>>> -				struct extent_node *next_ex)
>>> +				struct extent_node *next_ex,
>>> +				bool unaligned)
>>>    {
>>>    	struct extent_node *en = NULL;
>>>    
>>> -	if (prev_ex && __is_back_mergeable(ei, &prev_ex->ei)) {
>>> +	if (prev_ex && __is_back_mergeable(ei, &prev_ex->ei, unaligned)) {
>>>    		prev_ex->ei.len += ei->len;
>>>    		ei = &prev_ex->ei;
>>>    		en = prev_ex;
>>>    	}
>>>    
>>> -	if (next_ex && __is_front_mergeable(ei, &next_ex->ei)) {
>>> +	if (next_ex && __is_front_mergeable(ei, &next_ex->ei, unaligned)) {
>>>    		next_ex->ei.fofs = ei->fofs;
>>>    		next_ex->ei.blk = ei->blk;
>>>    		next_ex->ei.len += ei->len;
>>> @@ -495,7 +512,7 @@ static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi,
>>>    				struct extent_tree *et, struct extent_info *ei,
>>>    				struct rb_node **insert_p,
>>>    				struct rb_node *insert_parent,
>>> -				bool leftmost)
>>> +				bool leftmost, bool unaligned)
>>>    {
>>>    	struct rb_node **p;
>>>    	struct rb_node *parent = NULL;
>>> @@ -512,7 +529,7 @@ static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi,
>>>    	p = f2fs_lookup_rb_tree_for_insert(sbi, &et->root, &parent,
>>>    						ei->fofs, &leftmost);
>>>    do_insert:
>>> -	en = __attach_extent_node(sbi, et, ei, parent, p, leftmost);
>>> +	en = __attach_extent_node(sbi, et, ei, parent, p, leftmost, unaligned);
>>>    	if (!en)
>>>    		return NULL;
>>>    
>>> @@ -594,7 +611,7 @@ static void f2fs_update_extent_tree_range(struct inode *inode,
>>>    						end - dei.fofs + dei.blk,
>>>    						org_end - end);
>>>    				en1 = __insert_extent_tree(sbi, et, &ei,
>>> -							NULL, NULL, true);
>>> +						NULL, NULL, true, false);
>>>    				next_en = en1;
>>>    			} else {
>>>    				en->ei.fofs = end;
>>> @@ -633,9 +650,10 @@ static void f2fs_update_extent_tree_range(struct inode *inode,
>>>    	if (blkaddr) {
>>>    
>>>    		set_extent_info(&ei, fofs, blkaddr, len);
>>> -		if (!__try_merge_extent_node(sbi, et, &ei, prev_en, next_en))
>>> +		if (!__try_merge_extent_node(sbi, et, &ei,
>>> +					prev_en, next_en, false))
>>>    			__insert_extent_tree(sbi, et, &ei,
>>> -					insert_p, insert_parent, leftmost);
>>> +				insert_p, insert_parent, leftmost, false);
>>>    
>>>    		/* give up extent_cache, if split and small updates happen */
>>>    		if (dei.len >= 1 &&
>>> @@ -661,6 +679,47 @@ static void f2fs_update_extent_tree_range(struct inode *inode,
>>>    		f2fs_mark_inode_dirty_sync(inode, true);
>>>    }
>>>    
>>> +void f2fs_update_extent_tree_range_unaligned(struct inode *inode,
>>> +				pgoff_t fofs, block_t blkaddr, unsigned int llen,
>>> +				unsigned int plen)
>>> +{
>>> +	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>>> +	struct extent_tree *et = F2FS_I(inode)->extent_tree;
>>> +	struct extent_node *en = NULL;
>>> +	struct extent_node *prev_en = NULL, *next_en = NULL;
>>> +	struct extent_info_unaligned eiu;
>>> +	struct rb_node **insert_p = NULL, *insert_parent = NULL;
>>> +	bool leftmost = false;
>>> +
>>> +	trace_f2fs_update_extent_tree_range(inode, fofs, blkaddr, llen);
>>> +
>>> +	write_lock(&et->lock);
>>> +
>>> +	if (is_inode_flag_set(inode, FI_NO_EXTENT)) {
>>> +		write_unlock(&et->lock);
>>> +		return;
>>> +	}
>>> +
>>> +	en = (struct extent_node *)f2fs_lookup_rb_tree_ret(&et->root,
>>> +				(struct rb_entry *)et->cached_en, fofs,
>>> +				(struct rb_entry **)&prev_en,
>>> +				(struct rb_entry **)&next_en,
>>> +				&insert_p, &insert_parent, false,
>>> +				&leftmost);
>>> +	f2fs_bug_on(sbi, en);
>>> +
>>> +	set_extent_info(&eiu.ei, fofs, blkaddr, llen);
>>> +	eiu.plen = plen;
>>> +
>>> +	if (!__try_merge_extent_node(sbi, et, (struct extent_info *)&eiu,
>>> +				prev_en, next_en, true))
>>> +		__insert_extent_tree(sbi, et, (struct extent_info *)&eiu,
>>> +				insert_p, insert_parent, leftmost, true);
>>> +
>>> +	write_unlock(&et->lock);
>>> +}
>>> +
>>> +
>>>    unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)
>>>    {
>>>    	struct extent_tree *et, *next;
>>> @@ -818,6 +877,17 @@ bool f2fs_lookup_extent_cache(struct inode *inode, pgoff_t pgofs,
>>>    	return f2fs_lookup_extent_tree(inode, pgofs, ei);
>>>    }
>>>    
>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>> +bool f2fs_lookup_extent_cache_unaligned(struct inode *inode, pgoff_t pgofs,
>>> +					struct extent_info_unaligned *eiu)
>>> +{
>>> +	if (!f2fs_may_extent_tree(inode))
>>> +		return false;
>>> +
>>> +	return f2fs_lookup_extent_tree(inode, pgofs, (struct extent_info *)eiu);
>>> +}
>>> +#endif
>>> +
>>>    void f2fs_update_extent_cache(struct dnode_of_data *dn)
>>>    {
>>>    	pgoff_t fofs;
>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>>> index 0fe239dd50f4..3a02642a26d4 100644
>>> --- a/fs/f2fs/f2fs.h
>>> +++ b/fs/f2fs/f2fs.h
>>> @@ -578,11 +578,21 @@ struct extent_info {
>>>    	u32 blk;			/* start block address of the extent */
>>>    };
>>>    
>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>> +struct extent_info_unaligned {
>>> +	struct extent_info ei;		/* extent info */
>>> +	unsigned int plen;		/* physical extent length of compressed blocks */
>>> +};
>>> +#endif
>>> +
>>>    struct extent_node {
>>>    	struct rb_node rb_node;		/* rb node located in rb-tree */
>>>    	struct extent_info ei;		/* extent info */
>>>    	struct list_head list;		/* node in global extent list of sbi */
>>>    	struct extent_tree *et;		/* extent tree pointer */
>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>> +	unsigned int plen;		/* physical extent length of compressed blocks */
>>> +#endif
>>>    };
>>>    
>>>    struct extent_tree {
>>> @@ -817,22 +827,29 @@ static inline bool __is_discard_front_mergeable(struct discard_info *cur,
>>>    }
>>>    
>>>    static inline bool __is_extent_mergeable(struct extent_info *back,
>>> -						struct extent_info *front)
>>> +				struct extent_info *front, bool unaligned)
>>>    {
>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>> +	struct extent_info_unaligned *be = (struct extent_info_unaligned *)back;
>>> +	struct extent_info_unaligned *fe = (struct extent_info_unaligned *)front;
>>> +
>>> +	if (!unaligned || be->ei.len != be->plen || fe->ei.len != fe->plen)
>>> +		return false;
>>> +#endif
>>>    	return (back->fofs + back->len == front->fofs &&
>>>    			back->blk + back->len == front->blk);
>>>    }
>>>    
>>>    static inline bool __is_back_mergeable(struct extent_info *cur,
>>> -						struct extent_info *back)
>>> +				struct extent_info *back, bool unaligned)
>>>    {
>>> -	return __is_extent_mergeable(back, cur);
>>> +	return __is_extent_mergeable(back, cur, unaligned);
>>>    }
>>>    
>>>    static inline bool __is_front_mergeable(struct extent_info *cur,
>>> -						struct extent_info *front)
>>> +				struct extent_info *front, bool unaligned)
>>>    {
>>> -	return __is_extent_mergeable(cur, front);
>>> +	return __is_extent_mergeable(cur, front, unaligned);
>>>    }
>>>    
>>>    extern void f2fs_mark_inode_dirty_sync(struct inode *inode, bool sync);
>>> @@ -3972,6 +3989,9 @@ struct rb_entry *f2fs_lookup_rb_tree_ret(struct rb_root_cached *root,
>>>    		bool force, bool *leftmost);
>>>    bool f2fs_check_rb_tree_consistence(struct f2fs_sb_info *sbi,
>>>    				struct rb_root_cached *root, bool check_key);
>>> +void f2fs_update_extent_tree_range_unaligned(struct inode *inode,
>>> +				pgoff_t fofs, block_t blkaddr, unsigned int llen,
>>> +				unsigned int plen);
>>>    unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink);
>>>    void f2fs_init_extent_tree(struct inode *inode, struct page *ipage);
>>>    void f2fs_drop_extent_tree(struct inode *inode);
>>> @@ -3979,6 +3999,8 @@ unsigned int f2fs_destroy_extent_node(struct inode *inode);
>>>    void f2fs_destroy_extent_tree(struct inode *inode);
>>>    bool f2fs_lookup_extent_cache(struct inode *inode, pgoff_t pgofs,
>>>    			struct extent_info *ei);
>>> +bool f2fs_lookup_extent_cache_unaligned(struct inode *inode, pgoff_t pgofs,
>>> +					struct extent_info_unaligned *eiu);
>>>    void f2fs_update_extent_cache(struct dnode_of_data *dn);
>>>    void f2fs_update_extent_cache_range(struct dnode_of_data *dn,
>>>    			pgoff_t fofs, block_t blkaddr, unsigned int len);
>>> @@ -4055,6 +4077,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>>>    struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc);
>>>    void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed);
>>>    void f2fs_put_page_dic(struct page *page);
>>> +int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn);
>>>    int f2fs_init_compress_ctx(struct compress_ctx *cc);
>>>    void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse);
>>>    void f2fs_init_compress_info(struct f2fs_sb_info *sbi);
>>> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
>>> index dd611efa8aa4..7be2b01caa2a 100644
>>> --- a/fs/f2fs/node.c
>>> +++ b/fs/f2fs/node.c
>>> @@ -832,6 +832,26 @@ int f2fs_get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
>>>    	dn->ofs_in_node = offset[level];
>>>    	dn->node_page = npage[level];
>>>    	dn->data_blkaddr = f2fs_data_blkaddr(dn);
>>> +
>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>> +	if (is_inode_flag_set(dn->inode, FI_COMPRESSED_FILE) &&
>>> +			!f2fs_sb_has_readonly(sbi)) {
>>> +		int blknum = f2fs_cluster_blocks_are_contiguous(dn);
>>> +
>>> +		if (blknum) {
>>> +			block_t blkaddr = f2fs_data_blkaddr(dn);
>>> +
>>> +			if (blkaddr == COMPRESS_ADDR)
>>> +				blkaddr = data_blkaddr(dn->inode, dn->node_page,
>>> +							dn->ofs_in_node + 1);
>>> +
>>> +			f2fs_update_extent_tree_range_unaligned(dn->inode,
>>> +					index, blkaddr,
>>> +					F2FS_I(dn->inode)->i_cluster_size,
>>> +					blknum);
>>> +		}
>>> +	}
>>> +#endif
>>>    	return 0;
>>>    
>>>    release_pages:
>>> -- 
>>> 2.22.1
> 
> 
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