linux-kernel - [PATCH] fs: btrfs: Optimize code execution process to save time

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Date:   Mon, 26 Jun 2023 18:07:16 +0800
From:   Lu Hongfei <luhongfei@...o.com>
To:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com, luhongfei@...o.com
Subject: [PATCH] fs: btrfs: Optimize code execution process to save time

Originally, the btrfs_check_data_free_space used round_down twice when
aligning the range, which to some extent increased the execution time of
the code.
After optimization, round_down only needs to be executed once, which can
improve code efficiency and increase code readability.

Signed-off-by: Lu Hongfei <luhongfei@...o.com>
---
 fs/btrfs/delalloc-space.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/btrfs/delalloc-space.c b/fs/btrfs/delalloc-space.c
index 427abaf608b8..fd33b1cf1954 100644
--- a/fs/btrfs/delalloc-space.c
+++ b/fs/btrfs/delalloc-space.c
@@ -137,9 +137,8 @@ int btrfs_check_data_free_space(struct btrfs_inode *inode,
 	int ret;
 
 	/* align the range */
-	len = round_up(start + len, fs_info->sectorsize) -
-	      round_down(start, fs_info->sectorsize);
 	start = round_down(start, fs_info->sectorsize);
+	len = round_up(start + len, fs_info->sectorsize) - start;
 
 	if (noflush)
 		flush = BTRFS_RESERVE_NO_FLUSH;
-- 
2.39.0