linux-kernel - [PATCH] iomap: directly use logical block size

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Date:   Wed, 26 Oct 2022 09:51:33 -0700
From:   Keith Busch <kbusch@...a.com>
To:     <linux-fsdevel@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <hch@....de>, <djwong@...nel.org>,
        <bvanassche@....org>, Keith Busch <kbusch@...nel.org>
Subject: [PATCH] iomap: directly use logical block size

From: Keith Busch <kbusch@...nel.org>

Don't transform the logical block size to a bit shift only to shift it
back to the original block size. Just use the size.

Signed-off-by: Keith Busch <kbusch@...nel.org>
---
 fs/iomap/direct-io.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 4eb559a16c9e..503b97e5a115 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -240,7 +240,7 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter,
 {
 	const struct iomap *iomap = &iter->iomap;
 	struct inode *inode = iter->inode;
-	unsigned int blkbits = blksize_bits(bdev_logical_block_size(iomap->bdev));
+	unsigned int blksz = bdev_logical_block_size(iomap->bdev);
 	unsigned int fs_block_size = i_blocksize(inode), pad;
 	loff_t length = iomap_length(iter);
 	loff_t pos = iter->pos;
@@ -252,7 +252,7 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter,
 	size_t copied = 0;
 	size_t orig_count;
 
-	if ((pos | length) & ((1 << blkbits) - 1) ||
+	if ((pos | length) & (blksz - 1) ||
 	    !bdev_iter_is_aligned(iomap->bdev, dio->submit.iter))
 		return -EINVAL;
 
-- 
2.30.2