178 	struct buffer_head map_bh;  member
199 	struct buffer_head *map_bh = &args->map_bh;  in do_mpage_readpage()  local
235 	nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
236 	if (buffer_mapped(map_bh) &&  in do_mpage_readpage()
244 				clear_buffer_mapped(map_bh);  in do_mpage_readpage()
249 			blocks[page_block] = map_bh->b_blocknr + map_offset +  in do_mpage_readpage()
254 		bdev = map_bh->b_bdev;  in do_mpage_readpage()
260 	map_bh->b_page = page;  in do_mpage_readpage()
262 		map_bh->b_state = 0;  in do_mpage_readpage()
263 		map_bh->b_size = 0;  in do_mpage_readpage()
266 			map_bh->b_size = (last_block-block_in_file) << blkbits;  in do_mpage_readpage()
267 			if (args->get_block(inode, block_in_file, map_bh, 0))  in do_mpage_readpage()
272 		if (!buffer_mapped(map_bh)) {  in do_mpage_readpage()
287 		if (buffer_uptodate(map_bh)) {  in do_mpage_readpage()
288 			map_buffer_to_page(page, map_bh, page_block);  in do_mpage_readpage()
296 		if (page_block && blocks[page_block-1] != map_bh->b_blocknr-1)  in do_mpage_readpage()
298 		nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
301 				clear_buffer_mapped(map_bh);  in do_mpage_readpage()
305 			blocks[page_block] = map_bh->b_blocknr+relative_block;  in do_mpage_readpage()
309 		bdev = map_bh->b_bdev;  in do_mpage_readpage()
357 	nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
358 	if ((buffer_boundary(map_bh) && relative_block == nblocks) ||  in do_mpage_readpage()
536 	struct buffer_head map_bh;  in __mpage_writepage()  local
597 	map_bh.b_page = page;  in __mpage_writepage()
600 		map_bh.b_state = 0;  in __mpage_writepage()
601 		map_bh.b_size = 1 << blkbits;  in __mpage_writepage()
602 		if (mpd->get_block(inode, block_in_file, &map_bh, 1))  in __mpage_writepage()
604 		if (buffer_new(&map_bh))  in __mpage_writepage()
605 			clean_bdev_bh_alias(&map_bh);  in __mpage_writepage()
606 		if (buffer_boundary(&map_bh)) {  in __mpage_writepage()
607 			boundary_block = map_bh.b_blocknr;  in __mpage_writepage()
608 			boundary_bdev = map_bh.b_bdev;  in __mpage_writepage()
611 			if (map_bh.b_blocknr != blocks[page_block-1] + 1)  in __mpage_writepage()
614 		blocks[page_block++] = map_bh.b_blocknr;  in __mpage_writepage()
615 		boundary = buffer_boundary(&map_bh);  in __mpage_writepage()
616 		bdev = map_bh.b_bdev;  in __mpage_writepage()