1461 static void mpage_release_unused_pages(struct mpage_da_data *mpd,  in mpage_release_unused_pages()  argument
1467 	struct inode *inode = mpd->inode;  in mpage_release_unused_pages()
1471 	if (mpd->first_page >= mpd->next_page)  in mpage_release_unused_pages()
1474 	index = mpd->first_page;  in mpage_release_unused_pages()
1475 	end   = mpd->next_page - 1;  in mpage_release_unused_pages()
1928 static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)  in mpage_submit_page()  argument
1931 	loff_t size = i_size_read(mpd->inode);  in mpage_submit_page()
1934 	BUG_ON(page->index != mpd->first_page);  in mpage_submit_page()
1940 	err = ext4_bio_write_page(&mpd->io_submit, page, len, mpd->wbc, false);  in mpage_submit_page()
1942 		mpd->wbc->nr_to_write--;  in mpage_submit_page()
1943 	mpd->first_page++;  in mpage_submit_page()
1971 static bool mpage_add_bh_to_extent(struct mpage_da_data *mpd, ext4_lblk_t lblk,  in mpage_add_bh_to_extent()  argument
1974 	struct ext4_map_blocks *map = &mpd->map;  in mpage_add_bh_to_extent()
2022 static int mpage_process_page_bufs(struct mpage_da_data *mpd,  in mpage_process_page_bufs()  argument
2027 	struct inode *inode = mpd->inode;  in mpage_process_page_bufs()
2035 		if (lblk >= blocks || !mpage_add_bh_to_extent(mpd, lblk, bh)) {  in mpage_process_page_bufs()
2037 			if (mpd->map.m_len)  in mpage_process_page_bufs()
2044 	if (mpd->map.m_len == 0) {  in mpage_process_page_bufs()
2045 		err = mpage_submit_page(mpd, head->b_page);  in mpage_process_page_bufs()
2066 static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)  in mpage_map_and_submit_buffers()  argument
2070 	struct inode *inode = mpd->inode;  in mpage_map_and_submit_buffers()
2078 	start = mpd->map.m_lblk >> bpp_bits;  in mpage_map_and_submit_buffers()
2079 	end = (mpd->map.m_lblk + mpd->map.m_len - 1) >> bpp_bits;  in mpage_map_and_submit_buffers()
2081 	pblock = mpd->map.m_pblk;  in mpage_map_and_submit_buffers()
2098 				if (lblk < mpd->map.m_lblk)  in mpage_map_and_submit_buffers()
2100 				if (lblk >= mpd->map.m_lblk + mpd->map.m_len) {  in mpage_map_and_submit_buffers()
2105 					mpd->map.m_len = 0;  in mpage_map_and_submit_buffers()
2106 					mpd->map.m_flags = 0;  in mpage_map_and_submit_buffers()
2114 					err = mpage_process_page_bufs(mpd, head,  in mpage_map_and_submit_buffers()
2133 			mpd->io_submit.io_end->size += PAGE_CACHE_SIZE;  in mpage_map_and_submit_buffers()
2135 			err = mpage_submit_page(mpd, page);  in mpage_map_and_submit_buffers()
2145 	mpd->map.m_len = 0;  in mpage_map_and_submit_buffers()
2146 	mpd->map.m_flags = 0;  in mpage_map_and_submit_buffers()
2150 static int mpage_map_one_extent(handle_t *handle, struct mpage_da_data *mpd)  in mpage_map_one_extent()  argument
2152 	struct inode *inode = mpd->inode;  in mpage_map_one_extent()
2153 	struct ext4_map_blocks *map = &mpd->map;  in mpage_map_one_extent()
2185 		if (!mpd->io_submit.io_end->handle &&  in mpage_map_one_extent()
2187 			mpd->io_submit.io_end->handle = handle->h_rsv_handle;  in mpage_map_one_extent()
2190 		ext4_set_io_unwritten_flag(inode, mpd->io_submit.io_end);  in mpage_map_one_extent()
2225 				       struct mpage_da_data *mpd,  in mpage_map_and_submit_extent()  argument
2228 	struct inode *inode = mpd->inode;  in mpage_map_and_submit_extent()
2229 	struct ext4_map_blocks *map = &mpd->map;  in mpage_map_and_submit_extent()
2234 	mpd->io_submit.io_end->offset =  in mpage_map_and_submit_extent()
2237 		err = mpage_map_one_extent(handle, mpd);  in mpage_map_and_submit_extent()
2275 		err = mpage_map_and_submit_buffers(mpd);  in mpage_map_and_submit_extent()
2285 	disksize = ((loff_t)mpd->first_page) << PAGE_CACHE_SHIFT;  in mpage_map_and_submit_extent()
2341 static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)  in mpage_prepare_extent_to_map()  argument
2343 	struct address_space *mapping = mpd->inode->i_mapping;  in mpage_prepare_extent_to_map()
2346 	long left = mpd->wbc->nr_to_write;  in mpage_prepare_extent_to_map()
2347 	pgoff_t index = mpd->first_page;  in mpage_prepare_extent_to_map()
2348 	pgoff_t end = mpd->last_page;  in mpage_prepare_extent_to_map()
2351 	int blkbits = mpd->inode->i_blkbits;  in mpage_prepare_extent_to_map()
2355 	if (mpd->wbc->sync_mode == WB_SYNC_ALL || mpd->wbc->tagged_writepages)  in mpage_prepare_extent_to_map()
2361 	mpd->map.m_len = 0;  in mpage_prepare_extent_to_map()
2362 	mpd->next_page = index;  in mpage_prepare_extent_to_map()
2390 			if (mpd->wbc->sync_mode == WB_SYNC_NONE && left <= 0)  in mpage_prepare_extent_to_map()
2394 			if (mpd->map.m_len > 0 && mpd->next_page != page->index)  in mpage_prepare_extent_to_map()
2407 			     (mpd->wbc->sync_mode == WB_SYNC_NONE)) ||  in mpage_prepare_extent_to_map()
2416 			if (mpd->map.m_len == 0)  in mpage_prepare_extent_to_map()
2417 				mpd->first_page = page->index;  in mpage_prepare_extent_to_map()
2418 			mpd->next_page = page->index + 1;  in mpage_prepare_extent_to_map()
2423 			err = mpage_process_page_bufs(mpd, head, head, lblk);  in mpage_prepare_extent_to_map()
2455 	struct mpage_da_data mpd;  in ext4_writepages()  local
2530 		mpd.first_page = writeback_index;  in ext4_writepages()
2531 		mpd.last_page = -1;  in ext4_writepages()
2533 		mpd.first_page = wbc->range_start >> PAGE_CACHE_SHIFT;  in ext4_writepages()
2534 		mpd.last_page = wbc->range_end >> PAGE_CACHE_SHIFT;  in ext4_writepages()
2537 	mpd.inode = inode;  in ext4_writepages()
2538 	mpd.wbc = wbc;  in ext4_writepages()
2539 	ext4_io_submit_init(&mpd.io_submit, wbc);  in ext4_writepages()
2542 		tag_pages_for_writeback(mapping, mpd.first_page, mpd.last_page);  in ext4_writepages()
2545 	while (!done && mpd.first_page <= mpd.last_page) {  in ext4_writepages()
2547 		mpd.io_submit.io_end = ext4_init_io_end(inode, GFP_KERNEL);  in ext4_writepages()
2548 		if (!mpd.io_submit.io_end) {  in ext4_writepages()
2572 			ext4_put_io_end(mpd.io_submit.io_end);  in ext4_writepages()
2576 		trace_ext4_da_write_pages(inode, mpd.first_page, mpd.wbc);  in ext4_writepages()
2577 		ret = mpage_prepare_extent_to_map(&mpd);  in ext4_writepages()
2579 			if (mpd.map.m_len)  in ext4_writepages()
2580 				ret = mpage_map_and_submit_extent(handle, &mpd,  in ext4_writepages()
2594 		ext4_io_submit(&mpd.io_submit);  in ext4_writepages()
2596 		mpage_release_unused_pages(&mpd, give_up_on_write);  in ext4_writepages()
2598 		ext4_put_io_end(mpd.io_submit.io_end);  in ext4_writepages()
2617 		mpd.last_page = writeback_index - 1;  in ext4_writepages()
2618 		mpd.first_page = 0;  in ext4_writepages()
2628 		mapping->writeback_index = mpd.first_page;  in ext4_writepages()