linux-kernel - Re: [f2fs-dev] [RFC PATCH v5] f2fs: support data compression

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Date:   Mon, 23 Dec 2019 11:58:48 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [RFC PATCH v5] f2fs: support data compression

On 2019/12/23 11:32, Chao Yu wrote:
> Hi Jaegeuk,
> 
> Sorry for the delay.
> 
> On 2019/12/19 5:46, Jaegeuk Kim wrote:
>> Hi Chao,
>>
>> I still see some diffs from my latest testing version, so please check anything
>> that you made additionally from here.
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev&id=25d18e19a91e60837d36368ee939db13fd16dc64
> 
> I've checked the diff and picked up valid parts, could you please check and
> comment on it?
> 
> ---
>  fs/f2fs/compress.c |  8 ++++----
>  fs/f2fs/data.c     | 18 +++++++++++++++---
>  fs/f2fs/f2fs.h     |  3 +++
>  fs/f2fs/file.c     |  1 -
>  4 files changed, 22 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index af23ed6deffd..1bc86a54ad71 100644
> --- a/fs/f2fs/compress.c
> +++ b/fs/f2fs/compress.c
> @@ -593,7 +593,7 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
>  							fgp_flag, GFP_NOFS);
>  		if (!page) {
>  			ret = -ENOMEM;
> -			goto unlock_pages;
> +			goto release_pages;
>  		}
> 
>  		if (PageUptodate(page))
> @@ -608,13 +608,13 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
>  		ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
>  						&last_block_in_bio, false);
>  		if (ret)
> -			goto release_pages;
> +			goto unlock_pages;
>  		if (bio)
>  			f2fs_submit_bio(sbi, bio, DATA);
> 
>  		ret = f2fs_init_compress_ctx(cc);
>  		if (ret)
> -			goto release_pages;
> +			goto unlock_pages;
>  	}
> 
>  	for (i = 0; i < cc->cluster_size; i++) {
> @@ -762,7 +762,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
>  	if (err)
>  		goto out_unlock_op;
> 
> -	psize = (cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
> +	psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
> 
>  	err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
>  	if (err)
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 19cd03450066..f1f5c701228d 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -184,13 +184,18 @@ static void f2fs_decompress_work(struct bio_post_read_ctx *ctx)
>  }
> 
>  #ifdef CONFIG_F2FS_FS_COMPRESSION
> +void f2fs_verify_pages(struct page **rpages, unsigned int cluster_size)
> +{
> +	f2fs_decompress_end_io(rpages, cluster_size, false, true);
> +}
> +
>  static void f2fs_verify_bio(struct bio *bio)
>  {
>  	struct page *page = bio_first_page_all(bio);
>  	struct decompress_io_ctx *dic =
>  			(struct decompress_io_ctx *)page_private(page);
> 
> -	f2fs_decompress_end_io(dic->rpages, dic->cluster_size, false, true);
> +	f2fs_verify_pages(dic->rpages, dic->cluster_size);
>  	f2fs_free_dic(dic);
>  }
>  #endif
> @@ -507,10 +512,16 @@ static bool __has_merged_page(struct bio *bio, struct inode *inode,
>  	bio_for_each_segment_all(bvec, bio, iter_all) {
>  		struct page *target = bvec->bv_page;
> 
> -		if (fscrypt_is_bounce_page(target))
> +		if (fscrypt_is_bounce_page(target)) {
>  			target = fscrypt_pagecache_page(target);
> -		if (f2fs_is_compressed_page(target))
> +			if (IS_ERR(target))
> +				continue;
> +		}
> +		if (f2fs_is_compressed_page(target)) {
>  			target = f2fs_compress_control_page(target);
> +			if (IS_ERR(target))
> +				continue;
> +		}
> 
>  		if (inode && inode == target->mapping->host)
>  			return true;
> @@ -2039,6 +2050,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>  	if (ret)
>  		goto out;
> 
> +	/* cluster was overwritten as normal cluster */
>  	if (dn.data_blkaddr != COMPRESS_ADDR)
>  		goto out;
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 5d55cef66410..17d2af4eeafb 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -2719,6 +2719,7 @@ static inline void set_compress_context(struct inode *inode)
>  			1 << F2FS_I(inode)->i_log_cluster_size;
>  	F2FS_I(inode)->i_flags |= F2FS_COMPR_FL;
>  	set_inode_flag(inode, FI_COMPRESSED_FILE);
> +	stat_inc_compr_inode(inode);

BTW, if we track stats here, we need relocate set_compress_context to pass comppiling,
may moving it to the place around f2fs_may_compress().

Thanks,

>  }
> 
>  static inline unsigned int addrs_per_inode(struct inode *inode)
> @@ -3961,6 +3962,8 @@ static inline bool f2fs_force_buffered_io(struct inode *inode,
>  		return true;
>  	if (f2fs_is_multi_device(sbi))
>  		return true;
> +	if (f2fs_compressed_file(inode))
> +		return true;
>  	/*
>  	 * for blkzoned device, fallback direct IO to buffered IO, so
>  	 * all IOs can be serialized by log-structured write.
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index bde5612f37f5..9aeadf14413c 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1828,7 +1828,6 @@ static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
>  				return -EINVAL;
> 
>  			set_compress_context(inode);
> -			stat_inc_compr_inode(inode);
>  		}
>  	}
>  	if ((iflags ^ fi->i_flags) & F2FS_NOCOMP_FL) {
>