tree ad61daad74fa7f6fd0153cf9597bfc8b2e0710b4
parent 6a3e8ef0de1e548d1cf9bcf51d9b7b6f4141fec5
author Namjae Jeon <namjae.jeon@samsung.com> 1370694340 +0900
committer Jaegeuk Kim <jaegeuk.kim@samsung.com> 1371168282 +0900

f2fs: optimise the truncate_data_blocks_range() range

The function truncate_data_blocks_range() decrements the valid
block count of inode via dec_valid_block_count(). Since this
function updates the i_blocks field of inode, we can update this
field once we have calculated total the number of blocks
to be freed.

Therefore we can decrement valid blocks outside of the for loop.

	if (nr_free) {
+		dec_valid_block_count(sbi, dn->inode, nr_free);
 		set_page_dirty(dn->node_page);
 		sync_inode_page(dn);
 	}

'nr_free' tells the total number of blocks freed. So, we can
just directly pass this value to dec_valid_block_count() and update
the i_blocks.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>