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: Yohan Joung <yohan.joung@sk.com>
---
fs/f2fs/data.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index d872f785a996..d99ec9370b1d 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -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);
--
2.25.1