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 e7e6701806ad26658d8467af59085a447918093f..7ffdf0d037fae0c58127efff1618891fc32f5e77 100644 (file)
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -224,7 +224,7 @@ 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;