linux-kernel - [PATCH] erofs: shorten bvecs[] for file-backed mounts

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Message-ID: <20250107082825.74242-1-hsiangkao@linux.alibaba.com>
Date: Tue,  7 Jan 2025 16:28:25 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: linux-erofs@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org,
	Gao Xiang <hsiangkao@...ux.alibaba.com>
Subject: [PATCH] erofs: shorten bvecs[] for file-backed mounts

BIO_MAX_VECS is too large for __GFP_NOFAIL allocation. We could use
a mempool (since BIO can always proceed), but it seems overly
complicated for now.

Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
---
 fs/erofs/fileio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/fileio.c b/fs/erofs/fileio.c
index 33f8539dda4a..0ffd1c63beeb 100644
--- a/fs/erofs/fileio.c
+++ b/fs/erofs/fileio.c
@@ -6,7 +6,7 @@
 #include <trace/events/erofs.h>
 
 struct erofs_fileio_rq {
-	struct bio_vec bvecs[BIO_MAX_VECS];
+	struct bio_vec bvecs[16];
 	struct bio bio;
 	struct kiocb iocb;
 	struct super_block *sb;
@@ -68,7 +68,7 @@ static struct erofs_fileio_rq *erofs_fileio_rq_alloc(struct erofs_map_dev *mdev)
 	struct erofs_fileio_rq *rq = kzalloc(sizeof(*rq),
 					     GFP_KERNEL | __GFP_NOFAIL);
 
-	bio_init(&rq->bio, NULL, rq->bvecs, BIO_MAX_VECS, REQ_OP_READ);
+	bio_init(&rq->bio, NULL, rq->bvecs, ARRAY_SIZE(rq->bvecs), REQ_OP_READ);
 	rq->iocb.ki_filp = mdev->m_dif->file;
 	rq->sb = mdev->m_sb;
 	return rq;
-- 
2.43.5