linux-kernel - Re: [PATCH 2/4] f2fs: use new conversion functions between blks and bytes

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Message-ID: <20201201040944.GD3858797@google.com>
Date:   Mon, 30 Nov 2020 20:09:44 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org, kernel-team@...roid.com
Cc:     Linux F2FS Dev Mailing List 
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [PATCH 2/4] f2fs: use new conversion functions between blks and
 bytes

On 11/25, Jaegeuk Kim wrote:
> This patch cleans up blks and bytes conversions.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>  fs/f2fs/data.c | 46 +++++++++++++++++++++-------------------------
>  1 file changed, 21 insertions(+), 25 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index a8612c6f40ab..a84e5bc09337 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1750,6 +1750,16 @@ bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len)
>  	return true;
>  }
>  
> +static inline u64 bytes_to_blks(struct inode *inode, u64 bytes)
> +{
> +	return (bytes >> inode->i_blkbits);
> +}
> +
> +static inline u64 blks_to_bytes(struct inode *inode, u64 blks)
> +{
> +	return (blks << inode->i_blkbits);
> +}
> +
>  static int __get_data_block(struct inode *inode, sector_t iblock,
>  			struct buffer_head *bh, int create, int flag,
>  			pgoff_t *next_pgofs, int seg_type, bool may_write)
> @@ -1758,7 +1768,7 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
>  	int err;
>  
>  	map.m_lblk = iblock;
> -	map.m_len = bh->b_size >> inode->i_blkbits;
> +	map.m_len = bytes_to_blks(inode, bh->b_size);
>  	map.m_next_pgofs = next_pgofs;
>  	map.m_next_extent = NULL;
>  	map.m_seg_type = seg_type;
> @@ -1768,7 +1778,7 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
>  	if (!err) {
>  		map_bh(bh, inode->i_sb, map.m_pblk);
>  		bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
> -		bh->b_size = (u64)map.m_len << inode->i_blkbits;
> +		bh->b_size = blks_to_bytes(inode, map.m_len);
>  	}
>  	return err;
>  }
> @@ -1808,16 +1818,6 @@ static int get_data_block_bmap(struct inode *inode, sector_t iblock,
>  						NO_CHECK_TYPE, create);
>  }
>  
> -static inline u64 bytes_to_blks(struct inode *inode, u64 bytes)
> -{
> -	return (bytes >> inode->i_blkbits);
> -}
> -
> -static inline u64 blks_to_bytes(struct inode *inode, u64 blks)
> -{
> -	return (blks << inode->i_blkbits);
> -}
> -
>  static int f2fs_xattr_fiemap(struct inode *inode,
>  				struct fiemap_extent_info *fieinfo)
>  {
> @@ -2053,8 +2053,7 @@ static int f2fs_read_single_page(struct inode *inode, struct page *page,
>  					bool is_readahead)
>  {
>  	struct bio *bio = *bio_ret;
> -	const unsigned blkbits = inode->i_blkbits;
> -	const unsigned blocksize = 1 << blkbits;
> +	const unsigned blocksize = blks_to_bytes(inode, 1);
>  	sector_t block_in_file;
>  	sector_t last_block;
>  	sector_t last_block_in_file;
> @@ -2063,8 +2062,8 @@ static int f2fs_read_single_page(struct inode *inode, struct page *page,
>  
>  	block_in_file = (sector_t)page_index(page);
>  	last_block = block_in_file + nr_pages;
> -	last_block_in_file = (f2fs_readpage_limit(inode) + blocksize - 1) >>
> -							blkbits;
> +	last_block_in_file = bytes_to_blks(inode,
> +			f2fs_readpage_limit(inode) + blocksize - 1);
>  	if (last_block > last_block_in_file)
>  		last_block = last_block_in_file;
>  
> @@ -2177,16 +2176,15 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>  	struct bio *bio = *bio_ret;
>  	unsigned int start_idx = cc->cluster_idx << cc->log_cluster_size;
>  	sector_t last_block_in_file;
> -	const unsigned blkbits = inode->i_blkbits;
> -	const unsigned blocksize = 1 << blkbits;
> +	const unsigned blocksize = blks_to_bytes(inode, 1);
>  	struct decompress_io_ctx *dic = NULL;
>  	int i;
>  	int ret = 0;
>  
>  	f2fs_bug_on(sbi, f2fs_cluster_is_empty(cc));
>  
> -	last_block_in_file = (f2fs_readpage_limit(inode) +
> -					blocksize - 1) >> blkbits;
> +	last_block_in_file = bytes_to_blks(inode,
> +			f2fs_readpage_limit(inode) + blocksize - 1);
>  
>  	/* get rid of pages beyond EOF */
>  	for (i = 0; i < cc->cluster_size; i++) {
> @@ -3968,7 +3966,6 @@ static int check_swap_activate(struct swap_info_struct *sis,
>  	struct inode *inode = mapping->host;
>  	unsigned blocks_per_page;
>  	unsigned long page_no;
> -	unsigned blkbits;
>  	sector_t probe_block;
>  	sector_t last_block;
>  	sector_t lowest_block = -1;
> @@ -3979,8 +3976,7 @@ static int check_swap_activate(struct swap_info_struct *sis,
>  	if (PAGE_SIZE == F2FS_BLKSIZE)
>  		return check_swap_activate_fast(sis, swap_file, span);
>  
> -	blkbits = inode->i_blkbits;
> -	blocks_per_page = PAGE_SIZE >> blkbits;
> +	blocks_per_page = bytes_to_blks(inode, PAGE_SIZE);
>  
>  	/*
>  	 * Map all the blocks into the extent list.  This code doesn't try
> @@ -3988,7 +3984,7 @@ static int check_swap_activate(struct swap_info_struct *sis,
>  	 */
>  	probe_block = 0;
>  	page_no = 0;
> -	last_block = i_size_read(inode) >> blkbits;
> +	last_block = bytes_to_blks(inode, i_size_read(inode));
>  	while ((probe_block + blocks_per_page) <= last_block &&
>  			page_no < sis->max) {
>  		unsigned block_in_page;
> @@ -4028,7 +4024,7 @@ static int check_swap_activate(struct swap_info_struct *sis,
>  			}
>  		}
>  
> -		first_block >>= (PAGE_SHIFT - blkbits);
> +		first_block >>= (PAGE_SHIFT - inode->i_blkbits);
>  		if (page_no) {	/* exclude the header page */
>  			if (first_block < lowest_block)
>  				lowest_block = first_block;
> -- 
> 2.29.2.454.gaff20da3a2-goog