linux-kernel - [PATCH 2/5] squashfs: always use bio_kmalloc in squashfs_bio

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Date:   Tue,  8 Mar 2022 07:15:48 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Coly Li <colyli@...e.de>, Mike Snitzer <snitzer@...hat.com>,
        Song Liu <song@...nel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Phillip Lougher <phillip@...ashfs.org.uk>,
        linux-block@...r.kernel.org, dm-devel@...hat.com,
        linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
        linux-raid@...r.kernel.org, target-devel@...r.kernel.org,
        linux-btrfs@...r.kernel.org
Subject: [PATCH 2/5] squashfs: always use bio_kmalloc in squashfs_bio_read

If a plain kmalloc that is not backed by a mempool is safe here for a
large read (and the actual page allocations), it must also be for a
small one, so simplify the code a bit.

Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Phillip Lougher <phillip@...ashfs.org.uk>
---
 fs/squashfs/block.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
index 622c844f6d118..4311a32218928 100644
--- a/fs/squashfs/block.c
+++ b/fs/squashfs/block.c
@@ -86,16 +86,11 @@ static int squashfs_bio_read(struct super_block *sb, u64 index, int length,
 	int error, i;
 	struct bio *bio;
 
-	if (page_count <= BIO_MAX_VECS) {
-		bio = bio_alloc(sb->s_bdev, page_count, REQ_OP_READ, GFP_NOIO);
-	} else {
-		bio = bio_kmalloc(GFP_NOIO, page_count);
-		bio_set_dev(bio, sb->s_bdev);
-		bio->bi_opf = REQ_OP_READ;
-	}
-
+	bio = bio_kmalloc(GFP_NOIO, page_count);
 	if (!bio)
 		return -ENOMEM;
+	bio_set_dev(bio, sb->s_bdev);
+	bio->bi_opf = REQ_OP_READ;
 
 	bio->bi_iter.bi_sector = block * (msblk->devblksize >> SECTOR_SHIFT);
 
-- 
2.30.2