324 static int nfs_want_read_modify_write(struct file *file, struct page *page,  in nfs_want_read_modify_write()  argument
327 	unsigned int pglen = nfs_page_length(page);  in nfs_want_read_modify_write()
332 		if (!PageUptodate(page))  in nfs_want_read_modify_write()
338 	    !PageUptodate(page) &&		/* Uptodate? */  in nfs_want_read_modify_write()
339 	    !PagePrivate(page) &&		/* i/o request already? */  in nfs_want_read_modify_write()
356 			struct page **pagep, void **fsdata)  in nfs_write_begin()
360 	struct page *page;  in nfs_write_begin()  local
380 	page = grab_cache_page_write_begin(mapping, index, flags);  in nfs_write_begin()
381 	if (!page)  in nfs_write_begin()
383 	*pagep = page;  in nfs_write_begin()
385 	ret = nfs_flush_incompatible(file, page);  in nfs_write_begin()
387 		unlock_page(page);  in nfs_write_begin()
388 		page_cache_release(page);  in nfs_write_begin()
390 		   nfs_want_read_modify_write(file, page, pos, len)) {  in nfs_write_begin()
392 		ret = nfs_readpage(file, page);  in nfs_write_begin()
393 		page_cache_release(page);  in nfs_write_begin()
402 			struct page *page, void *fsdata)  in nfs_write_end()  argument
415 	if (!PageUptodate(page)) {  in nfs_write_end()
416 		unsigned pglen = nfs_page_length(page);  in nfs_write_end()
420 			zero_user_segments(page, 0, offset,  in nfs_write_end()
422 			SetPageUptodate(page);  in nfs_write_end()
424 			zero_user_segment(page, end, PAGE_CACHE_SIZE);  in nfs_write_end()
426 				SetPageUptodate(page);  in nfs_write_end()
428 			zero_user_segment(page, pglen, PAGE_CACHE_SIZE);  in nfs_write_end()
431 	status = nfs_updatepage(file, page, offset, copied);  in nfs_write_end()
433 	unlock_page(page);  in nfs_write_end()
434 	page_cache_release(page);  in nfs_write_end()
456 static void nfs_invalidate_page(struct page *page, unsigned int offset,  in nfs_invalidate_page()  argument
460 		 page, offset, length);  in nfs_invalidate_page()
465 	nfs_wb_page_cancel(page_file_mapping(page)->host, page);  in nfs_invalidate_page()
467 	nfs_fscache_invalidate_page(page, page->mapping->host);  in nfs_invalidate_page()
476 static int nfs_release_page(struct page *page, gfp_t gfp)  in nfs_release_page()  argument
478 	struct address_space *mapping = page->mapping;  in nfs_release_page()
480 	dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);  in nfs_release_page()
496 			wait_on_page_bit_killable_timeout(page, PG_private,  in nfs_release_page()
498 			if (PagePrivate(page))  in nfs_release_page()
504 	if (PagePrivate(page))  in nfs_release_page()
506 	return nfs_fscache_release_page(page, gfp);  in nfs_release_page()
509 static void nfs_check_dirty_writeback(struct page *page,  in nfs_check_dirty_writeback()  argument
513 	struct address_space *mapping = page_file_mapping(page);  in nfs_check_dirty_writeback()
515 	if (!mapping || PageSwapCache(page))  in nfs_check_dirty_writeback()
534 	if (PagePrivate(page))  in nfs_check_dirty_writeback()
546 static int nfs_launder_page(struct page *page)  in nfs_launder_page()  argument
548 	struct inode *inode = page_file_mapping(page)->host;  in nfs_launder_page()
552 		inode->i_ino, (long long)page_offset(page));  in nfs_launder_page()
554 	nfs_fscache_wait_on_page_write(nfsi, page);  in nfs_launder_page()
555 	return nfs_wb_page(inode, page);  in nfs_launder_page()
612 	struct page *page = vmf->page;  in nfs_vm_page_mkwrite()  local
621 		(long long)page_offset(page));  in nfs_vm_page_mkwrite()
624 	nfs_fscache_wait_on_page_write(NFS_I(inode), page);  in nfs_vm_page_mkwrite()
629 	lock_page(page);  in nfs_vm_page_mkwrite()
630 	mapping = page_file_mapping(page);  in nfs_vm_page_mkwrite()
634 	wait_on_page_writeback(page);  in nfs_vm_page_mkwrite()
636 	pagelen = nfs_page_length(page);  in nfs_vm_page_mkwrite()
641 	if (nfs_flush_incompatible(filp, page) == 0 &&  in nfs_vm_page_mkwrite()
642 	    nfs_updatepage(filp, page, 0, pagelen) == 0)  in nfs_vm_page_mkwrite()
647 	unlock_page(page);  in nfs_vm_page_mkwrite()