linux-kernel - [PATCH] fs/buffer: adjust the order of might_sleep() in __getblk

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Message-Id: <20230323093752.17461-1-gouhao@uniontech.com>
Date:   Thu, 23 Mar 2023 17:37:52 +0800
From:   gouhao@...ontech.com
To:     viro@...iv.linux.org.uk, brauner@...nel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] fs/buffer: adjust the order of might_sleep() in __getblk_gfp()

From: Gou Hao <gouhao@...ontech.com>

If 'bh' is found in cache, just return directly.
might_sleep() is only required on slow paths.

Signed-off-by: Gou Hao <gouhao@...ontech.com>
---
 fs/buffer.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 9e1e2add541e..e13eff504fb5 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1371,10 +1371,11 @@ __getblk_gfp(struct block_device *bdev, sector_t block,
 {
 	struct buffer_head *bh = __find_get_block(bdev, block, size);
 
+	if (bh)
+		return bh;
+
 	might_sleep();
-	if (bh == NULL)
-		bh = __getblk_slow(bdev, block, size, gfp);
-	return bh;
+	return __getblk_slow(bdev, block, size, gfp);
 }
 EXPORT_SYMBOL(__getblk_gfp);
 
-- 
2.20.1