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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: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
hifive-unleashed-5.1
Chao Yu 2015-02-05 17:50:30 +08:00 committed by Jaegeuk Kim
parent 4d0b0bd438
commit a2e7d1bfeb
1 changed files with 21 additions and 14 deletions
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35
fs/f2fs/data.c
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@ -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));