191  * @entry may no longer be the entry at the index in the mapping.
342 static void dax_associate_entry(void *entry, struct address_space *mapping,  in dax_associate_entry()  argument
355 		WARN_ON_ONCE(page->mapping);  in dax_associate_entry()
356 		page->mapping = mapping;  in dax_associate_entry()
361 static void dax_disassociate_entry(void *entry, struct address_space *mapping,  in dax_disassociate_entry()  argument
373 		WARN_ON_ONCE(page->mapping && page->mapping != mapping);  in dax_disassociate_entry()
374 		page->mapping = NULL;  in dax_disassociate_entry()
405 	/* Ensure page->mapping isn't freed while we look at it */  in dax_lock_page()
408 		struct address_space *mapping = READ_ONCE(page->mapping);  in dax_lock_page()  local
411 		if (!mapping || !dax_mapping(mapping))  in dax_lock_page()
422 		if (S_ISCHR(mapping->host->i_mode))  in dax_lock_page()
425 		xas.xa = &mapping->i_pages;  in dax_lock_page()
427 		if (mapping != page->mapping) {  in dax_lock_page()
449 	struct address_space *mapping = page->mapping;  in dax_unlock_page()  local
450 	XA_STATE(xas, &mapping->i_pages, page->index);  in dax_unlock_page()
452 	if (S_ISCHR(mapping->host->i_mode))  in dax_unlock_page()
488 		struct address_space *mapping, unsigned int order)  in grab_mapping_entry()  argument
530 			unmap_mapping_pages(mapping,  in grab_mapping_entry()
537 		dax_disassociate_entry(entry, mapping, false);  in grab_mapping_entry()
540 		mapping->nrpages -= PG_PMD_NR;  in grab_mapping_entry()
556 		mapping->nrpages += 1UL << order;  in grab_mapping_entry()
561 	if (xas_nomem(xas, mapping_gfp_mask(mapping) & ~__GFP_HIGHMEM))  in grab_mapping_entry()
574  * dax_layout_busy_page_range - find first pinned page in @mapping
575  * @mapping: address space to scan for a page with ref count > 1
583  * any page in the mapping is busy, i.e. for DMA, or other
591 struct page *dax_layout_busy_page_range(struct address_space *mapping,  in dax_layout_busy_page_range()  argument
599 	XA_STATE(xas, &mapping->i_pages, start_idx);  in dax_layout_busy_page_range()
607 	if (!dax_mapping(mapping) || !mapping_mapped(mapping))  in dax_layout_busy_page_range()
627 	unmap_mapping_pages(mapping, start_idx, end_idx - start_idx + 1, 0);  in dax_layout_busy_page_range()
653 struct page *dax_layout_busy_page(struct address_space *mapping)  in dax_layout_busy_page()  argument
655 	return dax_layout_busy_page_range(mapping, 0, LLONG_MAX);  in dax_layout_busy_page()
659 static int __dax_invalidate_entry(struct address_space *mapping,  in __dax_invalidate_entry()  argument
662 	XA_STATE(xas, &mapping->i_pages, index);  in __dax_invalidate_entry()
674 	dax_disassociate_entry(entry, mapping, trunc);  in __dax_invalidate_entry()
676 	mapping->nrpages -= 1UL << dax_entry_order(entry);  in __dax_invalidate_entry()
685  * Delete DAX entry at @index from @mapping.  Wait for it
688 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index)  in dax_delete_mapping_entry()  argument
690 	int ret = __dax_invalidate_entry(mapping, index, true);  in dax_delete_mapping_entry()
706 int dax_invalidate_mapping_entry_sync(struct address_space *mapping,  in dax_invalidate_mapping_entry_sync()  argument
709 	return __dax_invalidate_entry(mapping, index, false);  in dax_invalidate_mapping_entry_sync()
745 		struct address_space *mapping, struct vm_fault *vmf,  in dax_insert_entry()  argument
751 		__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);  in dax_insert_entry()
755 		/* we are replacing a zero page with block mapping */  in dax_insert_entry()
757 			unmap_mapping_pages(mapping, index & ~PG_PMD_COLOUR,  in dax_insert_entry()
760 			unmap_mapping_pages(mapping, index, 1, false);  in dax_insert_entry()
768 		dax_disassociate_entry(entry, mapping, false);  in dax_insert_entry()
769 		dax_associate_entry(new_entry, mapping, vmf->vma, vmf->address);  in dax_insert_entry()
804 static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index,  in dax_entry_mkclean()  argument
812 	i_mmap_lock_read(mapping);  in dax_entry_mkclean()
813 	vma_interval_tree_foreach(vma, &mapping->i_mmap, index, index) {  in dax_entry_mkclean()
874 	i_mmap_unlock_read(mapping);  in dax_entry_mkclean()
878 		struct address_space *mapping, void *entry)  in dax_writeback_one()  argument
884 	 * A page got tagged dirty in DAX mapping? Something is seriously  in dax_writeback_one()
940 	dax_entry_mkclean(mapping, index, pfn);  in dax_writeback_one()
945 	 * the pfn mappings are writeprotected and fault waits for mapping  in dax_writeback_one()
954 	trace_dax_writeback_one(mapping->host, index, count);  in dax_writeback_one()
963  * Flush the mapping to the persistent domain within the byte range of [start,
967 int dax_writeback_mapping_range(struct address_space *mapping,  in dax_writeback_mapping_range()  argument
970 	XA_STATE(xas, &mapping->i_pages, wbc->range_start >> PAGE_SHIFT);  in dax_writeback_mapping_range()
971 	struct inode *inode = mapping->host;  in dax_writeback_mapping_range()
980 	if (mapping_empty(mapping) || wbc->sync_mode != WB_SYNC_ALL)  in dax_writeback_mapping_range()
985 	tag_pages_for_writeback(mapping, xas.xa_index, end_index);  in dax_writeback_mapping_range()
989 		ret = dax_writeback_one(&xas, dax_dev, mapping, entry);  in dax_writeback_mapping_range()
991 			mapping_set_error(mapping, ret);  in dax_writeback_mapping_range()
1048  * sparse files.  Instead we insert a read-only mapping of the 4k zero page.
1049  * If this page is ever written to we will re-fault and change the mapping to
1053 		struct address_space *mapping, void **entry,  in dax_load_hole()  argument
1056 	struct inode *inode = mapping->host;  in dax_load_hole()
1061 	*entry = dax_insert_entry(xas, mapping, vmf, *entry, pfn,  in dax_load_hole()
1073 	struct address_space *mapping = vmf->vma->vm_file->f_mapping;  in dax_pmd_load_hole()  local
1076 	struct inode *inode = mapping->host;  in dax_pmd_load_hole()
1089 	*entry = dax_insert_entry(xas, mapping, vmf, *entry, pfn,  in dax_pmd_load_hole()
1308  * MAP_SYNC on a dax mapping guarantees dirty metadata is
1370  * @xas:	the dax mapping tree of a file
1378 	struct address_space *mapping = vmf->vma->vm_file->f_mapping;  in dax_fault_iter()  local
1395 			return dax_load_hole(xas, mapping, entry, vmf);  in dax_fault_iter()
1408 	*entry = dax_insert_entry(xas, mapping, vmf, *entry, pfn, entry_flags,  in dax_fault_iter()
1427 	struct address_space *mapping = vmf->vma->vm_file->f_mapping;  in dax_iomap_pte_fault()  local
1428 	XA_STATE(xas, &mapping->i_pages, vmf->pgoff);  in dax_iomap_pte_fault()
1430 		.inode		= mapping->host,  in dax_iomap_pte_fault()
1453 	entry = grab_mapping_entry(&xas, mapping, 0);  in dax_iomap_pte_fault()
1537 	struct address_space *mapping = vmf->vma->vm_file->f_mapping;  in dax_iomap_pmd_fault()  local
1538 	XA_STATE_ORDER(xas, &mapping->i_pages, vmf->pgoff, PMD_ORDER);  in dax_iomap_pmd_fault()
1540 		.inode		= mapping->host,  in dax_iomap_pmd_fault()
1575 	entry = grab_mapping_entry(&xas, mapping, PMD_ORDER);  in dax_iomap_pmd_fault()
1661 	struct address_space *mapping = vmf->vma->vm_file->f_mapping;  in dax_insert_pfn_mkwrite()  local
1662 	XA_STATE_ORDER(xas, &mapping->i_pages, vmf->pgoff, order);  in dax_insert_pfn_mkwrite()
1673 		trace_dax_insert_pfn_mkwrite_no_entry(mapping->host, vmf,  in dax_insert_pfn_mkwrite()
1689 	trace_dax_insert_pfn_mkwrite(mapping->host, vmf, ret);  in dax_insert_pfn_mkwrite()