ext4: cleanup clean_bdev_aliases() calls

Now, we have already handle all cases of forgetting buffer in
jbd2_journal_forget(), the buffer should not be mapped to blockdevice
when reallocating it. So this patch remove all clean_bdev_aliases() and
clean_bdev_bh_alias() calls which were invoked by ext4 explicitly.

Suggested-by: Jan Kara <[email protected]>
Signed-off-by: zhangyi (F) <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Reviewed-by: Jan Kara <[email protected]>

Author: zhangyi089

fs/ext4/extents.c

@@ -4048,18 +4048,8 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
 	} else
 		allocated = ret;
 	map->m_flags |= EXT4_MAP_NEW;
-	/*
-	 * if we allocated more blocks than requested
-	 * we need to make sure we unmap the extra block
-	 * allocated. The actual needed block will get
-	 * unmapped later when we find the buffer_head marked
-	 * new.
-	 */
-	if (allocated > map->m_len) {
-		clean_bdev_aliases(inode->i_sb->s_bdev, newblock + map->m_len,
-				   allocated - map->m_len);
+	if (allocated > map->m_len)
 		allocated = map->m_len;
-	}
 	map->m_len = allocated;
 
 map_out:

fs/ext4/inode.c

@@ -678,8 +678,6 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
 		if (flags & EXT4_GET_BLOCKS_ZERO &&
 		    map->m_flags & EXT4_MAP_MAPPED &&
 		    map->m_flags & EXT4_MAP_NEW) {
-			clean_bdev_aliases(inode->i_sb->s_bdev, map->m_pblk,
-					   map->m_len);
 			ret = ext4_issue_zeroout(inode, map->m_lblk,
 						 map->m_pblk, map->m_len);
 			if (ret) {
@@ -1194,7 +1192,6 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
 			if (err)
 				break;
 			if (buffer_new(bh)) {
-				clean_bdev_bh_alias(bh);
 				if (PageUptodate(page)) {
 					clear_buffer_new(bh);
 					set_buffer_uptodate(bh);
@@ -2490,10 +2487,6 @@ static int mpage_map_one_extent(handle_t *handle, struct mpage_da_data *mpd)
 	}
 
 	BUG_ON(map->m_len == 0);
-	if (map->m_flags & EXT4_MAP_NEW) {
-		clean_bdev_aliases(inode->i_sb->s_bdev, map->m_pblk,
-				   map->m_len);
-	}
 	return 0;
 }
 

fs/ext4/page-io.c

@@ -467,10 +467,8 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
 				ext4_io_submit(io);
 			continue;
 		}
-		if (buffer_new(bh)) {
+		if (buffer_new(bh))
 			clear_buffer_new(bh);
-			clean_bdev_bh_alias(bh);
-		}
 		set_buffer_async_write(bh);
 		nr_to_submit++;
 	} while ((bh = bh->b_this_page) != head);