linux-kernel - [PATCH AUTOSEL 6.12 27/37] fs/buffer: use sleeping version of __find_get

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Message-Id: <20250429235122.537321-27-sashal@kernel.org>
Date: Tue, 29 Apr 2025 19:51:12 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Davidlohr Bueso <dave@...olabs.net>,
	Jan Kara <jack@...e.cz>,
	kdevops@...ts.linux.dev,
	Luis Chamberlain <mcgrof@...nel.org>,
	Christian Brauner <brauner@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	viro@...iv.linux.org.uk,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 27/37] fs/buffer: use sleeping version of __find_get_block()

From: Davidlohr Bueso <dave@...olabs.net>

[ Upstream commit 5b67d43976828dea2394eae2556b369bb7a61f64 ]

Convert to the new nonatomic flavor to benefit from potential performance
benefits and adapt in the future vs migration such that semantics
are kept.

Convert write_boundary_block() which already takes the buffer
lock as well as bdev_getblk() depending on the respective gpf flags.
There are no changes in semantics.

Suggested-by: Jan Kara <jack@...e.cz>
Reviewed-by: Jan Kara <jack@...e.cz>
Signed-off-by: Davidlohr Bueso <dave@...olabs.net>
Link: https://kdevops.org/ext4/v6.15-rc2.html # [0]
Link: https://lore.kernel.org/all/aAAEvcrmREWa1SKF@bombadil.infradead.org/ # [1]
Link: https://lore.kernel.org/20250418015921.132400-4-dave@stgolabs.net
Tested-by: kdevops@...ts.linux.dev # [0] [1]
Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>
Signed-off-by: Christian Brauner <brauner@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/buffer.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index b04705eb6cc57..e9e84512a027a 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -658,7 +658,9 @@ EXPORT_SYMBOL(generic_buffers_fsync);
 void write_boundary_block(struct block_device *bdev,
 			sector_t bblock, unsigned blocksize)
 {
-	struct buffer_head *bh = __find_get_block(bdev, bblock + 1, blocksize);
+	struct buffer_head *bh;
+
+	bh = __find_get_block_nonatomic(bdev, bblock + 1, blocksize);
 	if (bh) {
 		if (buffer_dirty(bh))
 			write_dirty_buffer(bh, 0);
@@ -1446,7 +1448,12 @@ EXPORT_SYMBOL(__find_get_block_nonatomic);
 struct buffer_head *bdev_getblk(struct block_device *bdev, sector_t block,
 		unsigned size, gfp_t gfp)
 {
-	struct buffer_head *bh = __find_get_block(bdev, block, size);
+	struct buffer_head *bh;
+
+	if (gfpflags_allow_blocking(gfp))
+		bh = __find_get_block_nonatomic(bdev, block, size);
+	else
+		bh = __find_get_block(bdev, block, size);
 
 	might_alloc(gfp);
 	if (bh)
-- 
2.39.5