linux-kernel - [PATCH 1/2] iomap: Remove length variable in iomap_seek

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Message-Id: <20210706163158.2758223-1-willy@infradead.org>
Date:   Tue,  6 Jul 2021 17:31:56 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        "Darrick J. Wong" <djwong@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Christoph Hellwig <hch@....de>,
        Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH 1/2] iomap: Remove length variable in iomap_seek_data()

There's no need to calculate and maintain 'length'.  It's shorter and
simpler code to just calculate size - offset each time around the loop.

Suggested-by: Christoph Hellwig <hch@....de>
Reported-by: Zhen Lei <thunder.leizhen@...wei.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 fs/iomap/seek.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/fs/iomap/seek.c b/fs/iomap/seek.c
index dab1b02eba5b..241169b49af8 100644
--- a/fs/iomap/seek.c
+++ b/fs/iomap/seek.c
@@ -83,27 +83,23 @@ loff_t
 iomap_seek_data(struct inode *inode, loff_t offset, const struct iomap_ops *ops)
 {
 	loff_t size = i_size_read(inode);
-	loff_t length = size - offset;
 	loff_t ret;
 
 	/* Nothing to be found before or beyond the end of the file. */
 	if (offset < 0 || offset >= size)
 		return -ENXIO;
 
-	while (length > 0) {
-		ret = iomap_apply(inode, offset, length, IOMAP_REPORT, ops,
-				  &offset, iomap_seek_data_actor);
+	while (offset < size) {
+		ret = iomap_apply(inode, offset, size - offset, IOMAP_REPORT,
+				ops, &offset, iomap_seek_data_actor);
 		if (ret < 0)
 			return ret;
 		if (ret == 0)
-			break;
+			return offset;
 
 		offset += ret;
-		length -= ret;
 	}
 
-	if (length <= 0)
-		return -ENXIO;
-	return offset;
+	return -ENXIO;
 }
 EXPORT_SYMBOL_GPL(iomap_seek_data);
-- 
2.30.2