[PATCH 6/8] reiserfs: Convert map_block_for_writepage() to use kmap_local_folio()

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

Removes uses of kmap() and b_page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 fs/reiserfs/inode.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 0ca2d439510a..b79848111957 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -2360,6 +2360,7 @@ static int map_block_for_writepage(struct inode *inode,
 	struct item_head tmp_ih;
 	struct item_head *ih;
 	struct buffer_head *bh;
+	char *p;
 	__le32 *item;
 	struct cpu_key key;
 	INITIALIZE_PATH(path);
@@ -2382,7 +2383,8 @@ static int map_block_for_writepage(struct inode *inode,
 		return -EIO;
 	}
 
-	kmap(bh_result->b_page);
+	p = kmap_local_folio(bh_result->b_folio,
+			offset_in_folio(bh_result->b_folio, byte_offset - 1));
 start_over:
 	reiserfs_write_lock(inode->i_sb);
 	make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
@@ -2413,9 +2415,6 @@ static int map_block_for_writepage(struct inode *inode,
 		set_block_dev_mapped(bh_result,
 				     get_block_num(item, pos_in_item), inode);
 	} else if (is_direct_le_ih(ih)) {
-		char *p;
-		p = page_address(bh_result->b_page);
-		p += (byte_offset - 1) & (PAGE_SIZE - 1);
 		copy_size = ih_item_len(ih) - pos_in_item;
 
 		fs_gen = get_generation(inode->i_sb);
@@ -2491,7 +2490,7 @@ static int map_block_for_writepage(struct inode *inode,
 			}
 		}
 	}
-	kunmap(bh_result->b_page);
+	kunmap_local(p);
 
 	if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
 		/*
-- 
2.35.1