__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.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
fs/buffer.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 3fe293c9f3ca..58546bfd8903 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1464,7 +1464,9 @@ 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);
--
2.40.1
