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buffer: use bdev_getblk() to avoid memory reclaim in readahead path

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__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>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-09-14 16:00:07 +01:00 committed by Andrew Morton
parent e509ad4d77
commit 775d9b1053
1 changed files with 3 additions and 1 deletions
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4
fs/buffer.c
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@ -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);