137 	struct buffer_head map_bh;  member
158 	struct buffer_head *map_bh = &args->map_bh;  in do_mpage_readpage()  local
191 	nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
192 	if (buffer_mapped(map_bh) &&  in do_mpage_readpage()
198 		first_block = map_bh->b_blocknr + map_offset;  in do_mpage_readpage()
201 				clear_buffer_mapped(map_bh);  in do_mpage_readpage()
209 		bdev = map_bh->b_bdev;  in do_mpage_readpage()
215 	map_bh->b_folio = folio;  in do_mpage_readpage()
217 		map_bh->b_state = 0;  in do_mpage_readpage()
218 		map_bh->b_size = 0;  in do_mpage_readpage()
221 			map_bh->b_size = (last_block-block_in_file) << blkbits;  in do_mpage_readpage()
222 			if (args->get_block(inode, block_in_file, map_bh, 0))  in do_mpage_readpage()
227 		if (!buffer_mapped(map_bh)) {  in do_mpage_readpage()
242 		if (buffer_uptodate(map_bh)) {  in do_mpage_readpage()
243 			map_buffer_to_folio(folio, map_bh, page_block);  in do_mpage_readpage()
252 			first_block = map_bh->b_blocknr;  in do_mpage_readpage()
253 		else if (first_block + page_block != map_bh->b_blocknr)  in do_mpage_readpage()
255 		nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
258 				clear_buffer_mapped(map_bh);  in do_mpage_readpage()
265 		bdev = map_bh->b_bdev;  in do_mpage_readpage()
301 	nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
302 	if ((buffer_boundary(map_bh) && relative_block == nblocks) ||  in do_mpage_readpage()
472 	struct buffer_head map_bh;  in mpage_write_folio()  local
540 	map_bh.b_folio = folio;  in mpage_write_folio()
543 		map_bh.b_state = 0;  in mpage_write_folio()
544 		map_bh.b_size = 1 << blkbits;  in mpage_write_folio()
545 		if (mpd->get_block(inode, block_in_file, &map_bh, 1))  in mpage_write_folio()
547 		if (!buffer_mapped(&map_bh))  in mpage_write_folio()
549 		if (buffer_new(&map_bh))  in mpage_write_folio()
550 			clean_bdev_bh_alias(&map_bh);  in mpage_write_folio()
551 		if (buffer_boundary(&map_bh)) {  in mpage_write_folio()
552 			boundary_block = map_bh.b_blocknr;  in mpage_write_folio()
553 			boundary_bdev = map_bh.b_bdev;  in mpage_write_folio()
556 			if (map_bh.b_blocknr != first_block + page_block)  in mpage_write_folio()
559 			first_block = map_bh.b_blocknr;  in mpage_write_folio()
562 		boundary = buffer_boundary(&map_bh);  in mpage_write_folio()
563 		bdev = map_bh.b_bdev;  in mpage_write_folio()