119 	struct buffer_head map_bh;  member
140 	struct buffer_head *map_bh = &args->map_bh;  in do_mpage_readpage()  local
176 	nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
177 	if (buffer_mapped(map_bh) &&  in do_mpage_readpage()
185 				clear_buffer_mapped(map_bh);  in do_mpage_readpage()
190 			blocks[page_block] = map_bh->b_blocknr + map_offset +  in do_mpage_readpage()
195 		bdev = map_bh->b_bdev;  in do_mpage_readpage()
201 	map_bh->b_page = &folio->page;  in do_mpage_readpage()
203 		map_bh->b_state = 0;  in do_mpage_readpage()
204 		map_bh->b_size = 0;  in do_mpage_readpage()
207 			map_bh->b_size = (last_block-block_in_file) << blkbits;  in do_mpage_readpage()
208 			if (args->get_block(inode, block_in_file, map_bh, 0))  in do_mpage_readpage()
213 		if (!buffer_mapped(map_bh)) {  in do_mpage_readpage()
228 		if (buffer_uptodate(map_bh)) {  in do_mpage_readpage()
229 			map_buffer_to_folio(folio, map_bh, page_block);  in do_mpage_readpage()
237 		if (page_block && blocks[page_block-1] != map_bh->b_blocknr-1)  in do_mpage_readpage()
239 		nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
242 				clear_buffer_mapped(map_bh);  in do_mpage_readpage()
246 			blocks[page_block] = map_bh->b_blocknr+relative_block;  in do_mpage_readpage()
250 		bdev = map_bh->b_bdev;  in do_mpage_readpage()
291 	nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
292 	if ((buffer_boundary(map_bh) && relative_block == nblocks) ||  in do_mpage_readpage()
468 	struct buffer_head map_bh;  in __mpage_writepage()  local
528 	map_bh.b_page = page;  in __mpage_writepage()
531 		map_bh.b_state = 0;  in __mpage_writepage()
532 		map_bh.b_size = 1 << blkbits;  in __mpage_writepage()
533 		if (mpd->get_block(inode, block_in_file, &map_bh, 1))  in __mpage_writepage()
535 		if (buffer_new(&map_bh))  in __mpage_writepage()
536 			clean_bdev_bh_alias(&map_bh);  in __mpage_writepage()
537 		if (buffer_boundary(&map_bh)) {  in __mpage_writepage()
538 			boundary_block = map_bh.b_blocknr;  in __mpage_writepage()
539 			boundary_bdev = map_bh.b_bdev;  in __mpage_writepage()
542 			if (map_bh.b_blocknr != blocks[page_block-1] + 1)  in __mpage_writepage()
545 		blocks[page_block++] = map_bh.b_blocknr;  in __mpage_writepage()
546 		boundary = buffer_boundary(&map_bh);  in __mpage_writepage()
547 		bdev = map_bh.b_bdev;  in __mpage_writepage()