1712 static void mpage_release_unused_pages(struct mpage_da_data *mpd,  in mpage_release_unused_pages()  argument
1718 	struct inode *inode = mpd->inode;  in mpage_release_unused_pages()
1722 	if (mpd->first_page >= mpd->next_page)  in mpage_release_unused_pages()
1725 	index = mpd->first_page;  in mpage_release_unused_pages()
1726 	end   = mpd->next_page - 1;  in mpage_release_unused_pages()
2181 static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)  in mpage_submit_page()  argument
2187 	BUG_ON(page->index != mpd->first_page);  in mpage_submit_page()
2202 	size = i_size_read(mpd->inode);  in mpage_submit_page()
2207 	err = ext4_bio_write_page(&mpd->io_submit, page, len, mpd->wbc, false);  in mpage_submit_page()
2209 		mpd->wbc->nr_to_write--;  in mpage_submit_page()
2210 	mpd->first_page++;  in mpage_submit_page()
2238 static bool mpage_add_bh_to_extent(struct mpage_da_data *mpd, ext4_lblk_t lblk,  in mpage_add_bh_to_extent()  argument
2241 	struct ext4_map_blocks *map = &mpd->map;  in mpage_add_bh_to_extent()
2255 		if (!mpd->do_map)  in mpage_add_bh_to_extent()
2292 static int mpage_process_page_bufs(struct mpage_da_data *mpd,  in mpage_process_page_bufs()  argument
2297 	struct inode *inode = mpd->inode;  in mpage_process_page_bufs()
2305 		if (lblk >= blocks || !mpage_add_bh_to_extent(mpd, lblk, bh)) {  in mpage_process_page_bufs()
2307 			if (mpd->map.m_len)  in mpage_process_page_bufs()
2310 			if (!mpd->do_map)  in mpage_process_page_bufs()
2317 	if (mpd->map.m_len == 0) {  in mpage_process_page_bufs()
2318 		err = mpage_submit_page(mpd, head->b_page);  in mpage_process_page_bufs()
2339 static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)  in mpage_map_and_submit_buffers()  argument
2343 	struct inode *inode = mpd->inode;  in mpage_map_and_submit_buffers()
2351 	start = mpd->map.m_lblk >> bpp_bits;  in mpage_map_and_submit_buffers()
2352 	end = (mpd->map.m_lblk + mpd->map.m_len - 1) >> bpp_bits;  in mpage_map_and_submit_buffers()
2354 	pblock = mpd->map.m_pblk;  in mpage_map_and_submit_buffers()
2367 				if (lblk < mpd->map.m_lblk)  in mpage_map_and_submit_buffers()
2369 				if (lblk >= mpd->map.m_lblk + mpd->map.m_len) {  in mpage_map_and_submit_buffers()
2374 					mpd->map.m_len = 0;  in mpage_map_and_submit_buffers()
2375 					mpd->map.m_flags = 0;  in mpage_map_and_submit_buffers()
2383 					err = mpage_process_page_bufs(mpd, head,  in mpage_map_and_submit_buffers()
2402 			mpd->io_submit.io_end->size += PAGE_SIZE;  in mpage_map_and_submit_buffers()
2404 			err = mpage_submit_page(mpd, page);  in mpage_map_and_submit_buffers()
2413 	mpd->map.m_len = 0;  in mpage_map_and_submit_buffers()
2414 	mpd->map.m_flags = 0;  in mpage_map_and_submit_buffers()
2418 static int mpage_map_one_extent(handle_t *handle, struct mpage_da_data *mpd)  in mpage_map_one_extent()  argument
2420 	struct inode *inode = mpd->inode;  in mpage_map_one_extent()
2421 	struct ext4_map_blocks *map = &mpd->map;  in mpage_map_one_extent()
2454 		if (!mpd->io_submit.io_end->handle &&  in mpage_map_one_extent()
2456 			mpd->io_submit.io_end->handle = handle->h_rsv_handle;  in mpage_map_one_extent()
2459 		ext4_set_io_unwritten_flag(inode, mpd->io_submit.io_end);  in mpage_map_one_extent()
2491 				       struct mpage_da_data *mpd,  in mpage_map_and_submit_extent()  argument
2494 	struct inode *inode = mpd->inode;  in mpage_map_and_submit_extent()
2495 	struct ext4_map_blocks *map = &mpd->map;  in mpage_map_and_submit_extent()
2500 	mpd->io_submit.io_end->offset =  in mpage_map_and_submit_extent()
2503 		err = mpage_map_one_extent(handle, mpd);  in mpage_map_and_submit_extent()
2542 		err = mpage_map_and_submit_buffers(mpd);  in mpage_map_and_submit_extent()
2552 	disksize = ((loff_t)mpd->first_page) << PAGE_SHIFT;  in mpage_map_and_submit_extent()
2608 static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)  in mpage_prepare_extent_to_map()  argument
2610 	struct address_space *mapping = mpd->inode->i_mapping;  in mpage_prepare_extent_to_map()
2613 	long left = mpd->wbc->nr_to_write;  in mpage_prepare_extent_to_map()
2614 	pgoff_t index = mpd->first_page;  in mpage_prepare_extent_to_map()
2615 	pgoff_t end = mpd->last_page;  in mpage_prepare_extent_to_map()
2618 	int blkbits = mpd->inode->i_blkbits;  in mpage_prepare_extent_to_map()
2622 	if (mpd->wbc->sync_mode == WB_SYNC_ALL || mpd->wbc->tagged_writepages)  in mpage_prepare_extent_to_map()
2628 	mpd->map.m_len = 0;  in mpage_prepare_extent_to_map()
2629 	mpd->next_page = index;  in mpage_prepare_extent_to_map()
2647 			if (mpd->wbc->sync_mode == WB_SYNC_NONE && left <= 0)  in mpage_prepare_extent_to_map()
2651 			if (mpd->map.m_len > 0 && mpd->next_page != page->index)  in mpage_prepare_extent_to_map()
2664 			     (mpd->wbc->sync_mode == WB_SYNC_NONE)) ||  in mpage_prepare_extent_to_map()
2673 			if (mpd->map.m_len == 0)  in mpage_prepare_extent_to_map()
2674 				mpd->first_page = page->index;  in mpage_prepare_extent_to_map()
2675 			mpd->next_page = page->index + 1;  in mpage_prepare_extent_to_map()
2680 			err = mpage_process_page_bufs(mpd, head, head, lblk);  in mpage_prepare_extent_to_map()
2703 	struct mpage_da_data mpd;  in ext4_writepages()  local
2779 		mpd.first_page = writeback_index;  in ext4_writepages()
2780 		mpd.last_page = -1;  in ext4_writepages()
2782 		mpd.first_page = wbc->range_start >> PAGE_SHIFT;  in ext4_writepages()
2783 		mpd.last_page = wbc->range_end >> PAGE_SHIFT;  in ext4_writepages()
2786 	mpd.inode = inode;  in ext4_writepages()
2787 	mpd.wbc = wbc;  in ext4_writepages()
2788 	ext4_io_submit_init(&mpd.io_submit, wbc);  in ext4_writepages()
2791 		tag_pages_for_writeback(mapping, mpd.first_page, mpd.last_page);  in ext4_writepages()
2801 	mpd.do_map = 0;  in ext4_writepages()
2802 	mpd.io_submit.io_end = ext4_init_io_end(inode, GFP_KERNEL);  in ext4_writepages()
2803 	if (!mpd.io_submit.io_end) {  in ext4_writepages()
2807 	ret = mpage_prepare_extent_to_map(&mpd);  in ext4_writepages()
2809 	ext4_io_submit(&mpd.io_submit);  in ext4_writepages()
2810 	ext4_put_io_end_defer(mpd.io_submit.io_end);  in ext4_writepages()
2811 	mpd.io_submit.io_end = NULL;  in ext4_writepages()
2813 	mpage_release_unused_pages(&mpd, false);  in ext4_writepages()
2817 	while (!done && mpd.first_page <= mpd.last_page) {  in ext4_writepages()
2819 		mpd.io_submit.io_end = ext4_init_io_end(inode, GFP_KERNEL);  in ext4_writepages()
2820 		if (!mpd.io_submit.io_end) {  in ext4_writepages()
2844 			ext4_put_io_end(mpd.io_submit.io_end);  in ext4_writepages()
2845 			mpd.io_submit.io_end = NULL;  in ext4_writepages()
2848 		mpd.do_map = 1;  in ext4_writepages()
2850 		trace_ext4_da_write_pages(inode, mpd.first_page, mpd.wbc);  in ext4_writepages()
2851 		ret = mpage_prepare_extent_to_map(&mpd);  in ext4_writepages()
2853 			if (mpd.map.m_len)  in ext4_writepages()
2854 				ret = mpage_map_and_submit_extent(handle, &mpd,  in ext4_writepages()
2879 			mpd.do_map = 0;  in ext4_writepages()
2882 		ext4_io_submit(&mpd.io_submit);  in ext4_writepages()
2884 		mpage_release_unused_pages(&mpd, give_up_on_write);  in ext4_writepages()
2893 			ext4_put_io_end_defer(mpd.io_submit.io_end);  in ext4_writepages()
2896 			ext4_put_io_end(mpd.io_submit.io_end);  in ext4_writepages()
2897 		mpd.io_submit.io_end = NULL;  in ext4_writepages()
2917 		mpd.last_page = writeback_index - 1;  in ext4_writepages()
2918 		mpd.first_page = 0;  in ext4_writepages()
2928 		mapping->writeback_index = mpd.first_page;  in ext4_writepages()