[PATCH v2] f2fs: optimize f2fs DIO overwrites

[PATCH v2] f2fs: optimize f2fs DIO overwrites

[Yohan Joung]

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

Re: [PATCH v2] f2fs: optimize f2fs DIO overwrites

[Chao Yu]

On 3/17/25 21:36, Yohan Joung wrote:
> 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>

Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,

Re: [f2fs-dev] [PATCH v2] f2fs: optimize f2fs DIO overwrites

[patchwork-bot+f2fs]

Hello:

This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Mon, 17 Mar 2025 22:36:11 +0900 you wrote:
> 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(-)

Here is the summary with links:
  - [f2fs-dev,v2] f2fs: optimize f2fs DIO overwrites
    https://git.kernel.org/jaegeuk/f2fs/c/351bc761338d

You are awesome, thank you!
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