From 775d9b10530a0a303dc08a9cdb2ed1f8667d9c5f Mon Sep 17 00:00:00 2001
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: Thu, 14 Sep 2023 16:00:07 +0100
Subject: [PATCH] buffer: use bdev_getblk() to avoid memory reclaim in
readahead path
__getblk() adds __GFP_NOFAIL, which is unnecessary for readahead; we're
quite comfortable with the possibility that we may not get a bh back.
Switch to bdev_getblk() which does not include __GFP_NOFAIL.
Link: https://lkml.kernel.org/r/20230914150011.843330-5-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Hui Zhu <teawater@antgroup.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/buffer.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 80e96c1fcd333..edd1185945655 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1465,7 +1465,9 @@ EXPORT_SYMBOL(__getblk_gfp);
*/
void __breadahead(struct block_device *bdev, sector_t block, unsigned size)
{
- struct buffer_head *bh = __getblk(bdev, block, size);
+ struct buffer_head *bh = bdev_getblk(bdev, block, size,
+ GFP_NOWAIT | __GFP_MOVABLE);
+
if (likely(bh)) {
bh_readahead(bh, REQ_RAHEAD);
brelse(bh);
--
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