141 		sector_t *last_block_in_bio, struct buffer_head *map_bh,  in do_mpage_readpage()  argument
174 	nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
175 	if (buffer_mapped(map_bh) && block_in_file > *first_logical_block &&  in do_mpage_readpage()
182 				clear_buffer_mapped(map_bh);  in do_mpage_readpage()
187 			blocks[page_block] = map_bh->b_blocknr + map_offset +  in do_mpage_readpage()
192 		bdev = map_bh->b_bdev;  in do_mpage_readpage()
198 	map_bh->b_page = page;  in do_mpage_readpage()
200 		map_bh->b_state = 0;  in do_mpage_readpage()
201 		map_bh->b_size = 0;  in do_mpage_readpage()
204 			map_bh->b_size = (last_block-block_in_file) << blkbits;  in do_mpage_readpage()
205 			if (get_block(inode, block_in_file, map_bh, 0))  in do_mpage_readpage()
210 		if (!buffer_mapped(map_bh)) {  in do_mpage_readpage()
225 		if (buffer_uptodate(map_bh)) {  in do_mpage_readpage()
226 			map_buffer_to_page(page, map_bh, page_block);  in do_mpage_readpage()
234 		if (page_block && blocks[page_block-1] != map_bh->b_blocknr-1)  in do_mpage_readpage()
236 		nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
239 				clear_buffer_mapped(map_bh);  in do_mpage_readpage()
243 			blocks[page_block] = map_bh->b_blocknr+relative_block;  in do_mpage_readpage()
247 		bdev = map_bh->b_bdev;  in do_mpage_readpage()
293 	nblocks = map_bh->b_size >> blkbits;  in do_mpage_readpage()
294 	if ((buffer_boundary(map_bh) && relative_block == nblocks) ||  in do_mpage_readpage()
362 	struct buffer_head map_bh;  in mpage_readpages()  local
366 	map_bh.b_state = 0;  in mpage_readpages()
367 	map_bh.b_size = 0;  in mpage_readpages()
378 					&last_block_in_bio, &map_bh,  in mpage_readpages()
398 	struct buffer_head map_bh;  in mpage_readpage()  local
402 	map_bh.b_state = 0;  in mpage_readpage()
403 	map_bh.b_size = 0;  in mpage_readpage()
405 			&map_bh, &first_logical_block, get_block, gfp);  in mpage_readpage()
485 	struct buffer_head map_bh;  in __mpage_writepage()  local
546 	map_bh.b_page = page;  in __mpage_writepage()
549 		map_bh.b_state = 0;  in __mpage_writepage()
550 		map_bh.b_size = 1 << blkbits;  in __mpage_writepage()
551 		if (mpd->get_block(inode, block_in_file, &map_bh, 1))  in __mpage_writepage()
553 		if (buffer_new(&map_bh))  in __mpage_writepage()
554 			unmap_underlying_metadata(map_bh.b_bdev,  in __mpage_writepage()
555 						map_bh.b_blocknr);  in __mpage_writepage()
556 		if (buffer_boundary(&map_bh)) {  in __mpage_writepage()
557 			boundary_block = map_bh.b_blocknr;  in __mpage_writepage()
558 			boundary_bdev = map_bh.b_bdev;  in __mpage_writepage()
561 			if (map_bh.b_blocknr != blocks[page_block-1] + 1)  in __mpage_writepage()
564 		blocks[page_block++] = map_bh.b_blocknr;  in __mpage_writepage()
565 		boundary = buffer_boundary(&map_bh);  in __mpage_writepage()
566 		bdev = map_bh.b_bdev;  in __mpage_writepage()