Commit 351bc761 authored by Yohan Joung's avatar Yohan Joung Committed by Jaegeuk Kim
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f2fs: optimize f2fs DIO overwrites 



this is unnecessary when we know we are overwriting already allocated
blocks and the overhead of starting a transaction can be significant
especially for multithreaded workloads doing small writes.

Signed-off-by: default avatarYohan Joung <yohan.joung@sk.com>
Reviewed-by: default avatarChao Yu <chao@kernel.org>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent f098aeba

fs/f2fs/data.c

+7 −1
Original line number Diff line number Diff line
@@ -4181,7 +4181,13 @@ static int f2fs_iomap_begin(struct inode *inode, loff_t offset, loff_t length, 
	map.m_next_pgofs = &next_pgofs;

	map.m_seg_type = f2fs_rw_hint_to_seg_type(F2FS_I_SB(inode),

						inode->i_write_hint);

	if (flags & IOMAP_WRITE)



	/*

	 * If the blocks being overwritten are already allocated,

	 * f2fs_map_lock and f2fs_balance_fs are not necessary.

	 */

	if ((flags & IOMAP_WRITE) &&

		!f2fs_overwrite_io(inode, offset, length))

		map.m_may_create = true;



	err = f2fs_map_blocks(inode, &map, F2FS_GET_BLOCK_DIO);