iomap: Simplify is_partially_uptodate a little

Remove the unnecessary variable 'len' and fix a comment to refer to
the folio instead of the page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 49dccd9..8ce8720 100644 (file)
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -435,18 +435,17 @@ bool iomap_is_partially_uptodate(struct folio *folio, size_t from, size_t count)
 {
        struct iomap_page *iop = to_iomap_page(folio);
        struct inode *inode = folio->mapping->host;
-       size_t len;
        unsigned first, last, i;
 
        if (!iop)
                return false;
 
-       /* Limit range to this folio */
-       len = min(folio_size(folio) - from, count);
+       /* Caller's range may extend past the end of this folio */
+       count = min(folio_size(folio) - from, count);
 
-       /* First and last blocks in range within page */
+       /* First and last blocks in range within folio */
        first = from >> inode->i_blkbits;
-       last = (from + len - 1) >> inode->i_blkbits;
+       last = (from + count - 1) >> inode->i_blkbits;
 
        for (i = first; i <= last; i++)
                if (!test_bit(i, iop->uptodate))