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Commit a2e7d1bf authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
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f2fs: introduce f2fs_map_bh to clean codes of check_extent_cache 



This patch introduces f2fs_map_bh to clean codes of check_extent_cache.

v2:
 o cleanup f2fs_map_bh pointed out by Jaegeuk Kim.

Signed-off-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 4d0b0bd4

fs/f2fs/data.c

+21 −14
Original line number Diff line number Diff line
@@ -248,8 +248,23 @@ int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) 
	return err;

}



static void f2fs_map_bh(struct super_block *sb, pgoff_t pgofs,

			struct extent_info *ei, struct buffer_head *bh_result)

{

	unsigned int blkbits = sb->s_blocksize_bits;

	size_t count;



	set_buffer_new(bh_result);

	map_bh(bh_result, sb, ei->blk + pgofs - ei->fofs);

	count = ei->fofs + ei->len - pgofs;

	if (count < (UINT_MAX >> blkbits))

		bh_result->b_size = (count << blkbits);

	else

		bh_result->b_size = UINT_MAX;

}



static int check_extent_cache(struct inode *inode, pgoff_t pgofs,

					struct buffer_head *bh_result)

					struct extent_info *ei)

{

	struct f2fs_inode_info *fi = F2FS_I(inode);

	pgoff_t start_fofs, end_fofs;
@@ -271,18 +286,7 @@ static int check_extent_cache(struct inode *inode, pgoff_t pgofs, 
	start_blkaddr = fi->ext.blk;



	if (pgofs >= start_fofs && pgofs <= end_fofs) {

		unsigned int blkbits = inode->i_sb->s_blocksize_bits;

		size_t count;



		set_buffer_new(bh_result);

		map_bh(bh_result, inode->i_sb,

				start_blkaddr + pgofs - start_fofs);

		count = end_fofs - pgofs + 1;

		if (count < (UINT_MAX >> blkbits))

			bh_result->b_size = (count << blkbits);

		else

			bh_result->b_size = UINT_MAX;



		*ei = fi->ext;

		stat_inc_read_hit(inode->i_sb);

		read_unlock(&fi->ext_lock);

		return 1;
@@ -658,13 +662,16 @@ static int __get_data_block(struct inode *inode, sector_t iblock, 
	int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA;

	pgoff_t pgofs, end_offset;

	int err = 0, ofs = 1;

	struct extent_info ei;

	bool allocated = false;



	/* Get the page offset from the block offset(iblock) */

	pgofs =	(pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits));



	if (check_extent_cache(inode, pgofs, bh_result))

	if (check_extent_cache(inode, pgofs, &ei)) {

		f2fs_map_bh(inode->i_sb, pgofs, &ei, bh_result);

		goto out;

	}



	if (create)

		f2fs_lock_op(F2FS_I_SB(inode));