linux-kernel - [PATCH 1/4] fs/buffer: use sleeping lookup in __getblk

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Message-Id: <20250515173925.147823-2-dave@stgolabs.net>
Date: Thu, 15 May 2025 10:39:22 -0700
From: Davidlohr Bueso <dave@...olabs.net>
To: brauner@...nel.org
Cc: jack@...e.cz,
	viro@...iv.linux.org.uk,
	mcgrof@...nel.org,
	dave@...olabs.net,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] fs/buffer: use sleeping lookup in __getblk_slowpath()

Just as with the fast path, call the lookup variant depending
on the gfp flags.

Signed-off-by: Davidlohr Bueso <dave@...olabs.net>
---
 fs/buffer.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index b8e1e6e325cd..5a4342881f3b 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1122,6 +1122,8 @@ static struct buffer_head *
 __getblk_slow(struct block_device *bdev, sector_t block,
 	     unsigned size, gfp_t gfp)
 {
+	bool blocking = gfpflags_allow_blocking(gfp);
+
 	/* Size must be multiple of hard sectorsize */
 	if (unlikely(size & (bdev_logical_block_size(bdev)-1) ||
 			(size < 512 || size > PAGE_SIZE))) {
@@ -1137,7 +1139,10 @@ __getblk_slow(struct block_device *bdev, sector_t block,
 	for (;;) {
 		struct buffer_head *bh;
 
-		bh = __find_get_block(bdev, block, size);
+		if (blocking)
+			bh = __find_get_block_nonatomic(bdev, block, size);
+		else
+			bh = __find_get_block(bdev, block, size);
 		if (bh)
 			return bh;
 
-- 
2.39.5