iomap: skip unnecessary ifs_block_is_uptodate check

[ Upstream commit 8e3c15ee0d292c413c66fe10201d1b035a0bea72 ]

In iomap_adjust_read_range, i is either the first !uptodate block, or it
is past last for the second loop looking for trailing uptodate blocks.
Assuming there's no overflow (there's no combination of huge folios and
tiny blksize) then yeah, there is no point in retesting that the same
block pointed to by i is uptodate since we hold the folio lock so nobody
else could have set it uptodate.

Signed-off-by: Gou Hao <gouhao@uniontech.com>
Link: https://lore.kernel.org/20250410071236.16017-1-gouhao@uniontech.com
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 1bad460275ebe24a05a23ca04ffa68e092dac203..d4b990938399cf6fde89972447e3ffeae3ba4c57 100644 (file)
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -263,7 +263,7 @@ static void iomap_adjust_read_range(struct inode *inode, struct folio *folio,
                }
 
                /* truncate len if we find any trailing uptodate block(s) */
-               for ( ; i <= last; i++) {
+               while (++i <= last) {
                        if (ifs_block_is_uptodate(ifs, i)) {
                                plen -= (last - i + 1) * block_size;
                                last = i - 1;