1 /* SPDX-License-Identifier: GPL-2.0 */
21 unsigned long invalidate_mapping_pages(struct address_space *mapping,
26 	if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||  in invalidate_remote_inode()
27 	    S_ISLNK(inode->i_mode))  in invalidate_remote_inode()
28 		invalidate_mapping_pages(inode->i_mapping, 0, -1);  in invalidate_remote_inode()
30 int invalidate_inode_pages2(struct address_space *mapping);
31 int invalidate_inode_pages2_range(struct address_space *mapping,
39 int filemap_fdatawait_keep_errors(struct address_space *mapping);
41 int filemap_fdatawait_range_keep_errors(struct address_space *mapping,
44 static inline int filemap_fdatawait(struct address_space *mapping)  in filemap_fdatawait()  argument
46 	return filemap_fdatawait_range(mapping, 0, LLONG_MAX);  in filemap_fdatawait()
50 int filemap_write_and_wait_range(struct address_space *mapping,
52 int __filemap_fdatawrite_range(struct address_space *mapping,
54 int filemap_fdatawrite_range(struct address_space *mapping,
56 int filemap_check_errors(struct address_space *mapping);
57 void __filemap_set_wb_err(struct address_space *mapping, int err);
58 int filemap_fdatawrite_wbc(struct address_space *mapping,
62 static inline int filemap_write_and_wait(struct address_space *mapping)  in filemap_write_and_wait()  argument
64 	return filemap_write_and_wait_range(mapping, 0, LLONG_MAX);  in filemap_write_and_wait()
68  * filemap_set_wb_err - set a writeback error on an address_space
69  * @mapping: mapping in which to set writeback error
70  * @err: error to be set in mapping
78  * filemap_set_wb_err to record the error in the mapping so that it will be
81 static inline void filemap_set_wb_err(struct address_space *mapping, int err)  in filemap_set_wb_err()  argument
85 		__filemap_set_wb_err(mapping, err);  in filemap_set_wb_err()
89  * filemap_check_wb_err - has an error occurred since the mark was sampled?
90  * @mapping: mapping to check for writeback errors
91  * @since: previously-sampled errseq_t
93  * Grab the errseq_t value from the mapping, and see if it has changed "since"
98 static inline int filemap_check_wb_err(struct address_space *mapping,  in filemap_check_wb_err()  argument
101 	return errseq_check(&mapping->wb_err, since);  in filemap_check_wb_err()
105  * filemap_sample_wb_err - sample the current errseq_t to test for later errors
106  * @mapping: mapping to be sampled
111 static inline errseq_t filemap_sample_wb_err(struct address_space *mapping)  in filemap_sample_wb_err()  argument
113 	return errseq_sample(&mapping->wb_err);  in filemap_sample_wb_err()
117  * file_sample_sb_err - sample the current errseq_t to test for later errors
120  * Grab the most current superblock-level errseq_t value for the given
125 	return errseq_sample(&file->f_path.dentry->d_sb->s_wb_err);  in file_sample_sb_err()
129  * Flush file data before changing attributes.  Caller must hold any locks
136 	return filemap_write_and_wait(inode->i_mapping);  in inode_drain_writes()
139 static inline bool mapping_empty(struct address_space *mapping)  in mapping_empty()  argument
141 	return xa_empty(&mapping->i_pages);  in mapping_empty()
145  * mapping_shrinkable - test if page cache state allows inode reclaim
146  * @mapping: the page cache mapping
148  * This checks the mapping's cache state for the pupose of inode
154  * its LRU state don't nest inside the irq-safe i_pages lock.
165 static inline bool mapping_shrinkable(struct address_space *mapping)  in mapping_shrinkable()  argument
178 	head = rcu_access_pointer(mapping->i_pages.xa_head);  in mapping_shrinkable()
183 	 * The xarray stores single offset-0 entries directly in the  in mapping_shrinkable()
184 	 * head pointer, which allows non-resident page cache entries  in mapping_shrinkable()
195  * Bits in mapping->flags.
206 	AS_RELEASE_ALWAYS,	/* Call ->release_folio(), even if no private data */
210  * mapping_set_error - record a writeback error in the address_space
211  * @mapping: the mapping in which an error should be set
212  * @error: the error to set in the mapping
220  * mapping_set_error to record the error in the mapping so that it can be
223 static inline void mapping_set_error(struct address_space *mapping, int error)  in mapping_set_error()  argument
229 	__filemap_set_wb_err(mapping, error);  in mapping_set_error()
232 	if (mapping->host)  in mapping_set_error()
233 		errseq_set(&mapping->host->i_sb->s_wb_err, error);  in mapping_set_error()
236 	if (error == -ENOSPC)  in mapping_set_error()
237 		set_bit(AS_ENOSPC, &mapping->flags);  in mapping_set_error()
239 		set_bit(AS_EIO, &mapping->flags);  in mapping_set_error()
242 static inline void mapping_set_unevictable(struct address_space *mapping)  in mapping_set_unevictable()  argument
244 	set_bit(AS_UNEVICTABLE, &mapping->flags);  in mapping_set_unevictable()
247 static inline void mapping_clear_unevictable(struct address_space *mapping)  in mapping_clear_unevictable()  argument
249 	clear_bit(AS_UNEVICTABLE, &mapping->flags);  in mapping_clear_unevictable()
252 static inline bool mapping_unevictable(struct address_space *mapping)  in mapping_unevictable()  argument
254 	return mapping && test_bit(AS_UNEVICTABLE, &mapping->flags);  in mapping_unevictable()
257 static inline void mapping_set_exiting(struct address_space *mapping)  in mapping_set_exiting()  argument
259 	set_bit(AS_EXITING, &mapping->flags);  in mapping_set_exiting()
262 static inline int mapping_exiting(struct address_space *mapping)  in mapping_exiting()  argument
264 	return test_bit(AS_EXITING, &mapping->flags);  in mapping_exiting()
267 static inline void mapping_set_no_writeback_tags(struct address_space *mapping)  in mapping_set_no_writeback_tags()  argument
269 	set_bit(AS_NO_WRITEBACK_TAGS, &mapping->flags);  in mapping_set_no_writeback_tags()
272 static inline int mapping_use_writeback_tags(struct address_space *mapping)  in mapping_use_writeback_tags()  argument
274 	return !test_bit(AS_NO_WRITEBACK_TAGS, &mapping->flags);  in mapping_use_writeback_tags()
277 static inline bool mapping_release_always(const struct address_space *mapping)  in mapping_release_always()  argument
279 	return test_bit(AS_RELEASE_ALWAYS, &mapping->flags);  in mapping_release_always()
282 static inline void mapping_set_release_always(struct address_space *mapping)  in mapping_set_release_always()  argument
284 	set_bit(AS_RELEASE_ALWAYS, &mapping->flags);  in mapping_set_release_always()
287 static inline void mapping_clear_release_always(struct address_space *mapping)  in mapping_clear_release_always()  argument
289 	clear_bit(AS_RELEASE_ALWAYS, &mapping->flags);  in mapping_clear_release_always()
292 static inline gfp_t mapping_gfp_mask(struct address_space * mapping)  in mapping_gfp_mask()  argument
294 	return mapping->gfp_mask;  in mapping_gfp_mask()
297 /* Restricts the given gfp_mask to what the mapping allows. */
298 static inline gfp_t mapping_gfp_constraint(struct address_space *mapping,  in mapping_gfp_constraint()  argument
301 	return mapping_gfp_mask(mapping) & gfp_mask;  in mapping_gfp_constraint()
305  * This is non-atomic.  Only to be used before the mapping is activated.
310 	m->gfp_mask = mask;  in mapping_set_gfp_mask()
314  * mapping_set_large_folios() - Indicate the file supports large folios.
315  * @mapping: The file.
322  * is non-atomic.
324 static inline void mapping_set_large_folios(struct address_space *mapping)  in mapping_set_large_folios()  argument
326 	__set_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);  in mapping_set_large_folios()
333 static inline bool mapping_large_folio_support(struct address_space *mapping)  in mapping_large_folio_support()  argument
336 		test_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);  in mapping_large_folio_support()
339 static inline int filemap_nr_thps(struct address_space *mapping)  in filemap_nr_thps()  argument
342 	return atomic_read(&mapping->nr_thps);  in filemap_nr_thps()
348 static inline void filemap_nr_thps_inc(struct address_space *mapping)  in filemap_nr_thps_inc()  argument
351 	if (!mapping_large_folio_support(mapping))  in filemap_nr_thps_inc()
352 		atomic_inc(&mapping->nr_thps);  in filemap_nr_thps_inc()
354 	WARN_ON_ONCE(mapping_large_folio_support(mapping) == 0);  in filemap_nr_thps_inc()
358 static inline void filemap_nr_thps_dec(struct address_space *mapping)  in filemap_nr_thps_dec()  argument
361 	if (!mapping_large_folio_support(mapping))  in filemap_nr_thps_dec()
362 		atomic_dec(&mapping->nr_thps);  in filemap_nr_thps_dec()
364 	WARN_ON_ONCE(mapping_large_folio_support(mapping) == 0);  in filemap_nr_thps_dec()
373  * folio_file_mapping - Find the mapping this folio belongs to.
376  * For folios which are in the page cache, return the mapping that this
377  * page belongs to.  Folios in the swap cache return the mapping of the
378  * swap file or swap device where the data is stored.  This is different
379  * from the mapping returned by folio_mapping().  The only reason to
380  * use it is if, like NFS, you return 0 from ->activate_swapfile.
389 	return folio->mapping;  in folio_file_mapping()
393  * folio_flush_mapping - Find the file mapping this folio belongs to.
396  * For folios which are in the page cache, return the mapping that this
418  * folio_inode - Get the host inode for this folio.
428 	return folio->mapping->host;  in folio_inode()
432  * folio_attach_private - Attach private data to a folio.
433  * @folio: Folio to attach data to.
434  * @data: Data to attach to folio.
436  * Attaching private data to a folio increments the page's reference count.
437  * The data must be detached before the folio will be freed.
439 static inline void folio_attach_private(struct folio *folio, void *data)  in folio_attach_private()  argument
442 	folio->private = data;  in folio_attach_private()
447  * folio_change_private - Change private data on a folio.
448  * @folio: Folio to change the data on.
449  * @data: Data to set on the folio.
451  * Change the private data attached to a folio and return the old
452  * data.  The page must previously have had data attached and the data
455  * Return: Data that was previously attached to the folio.
457 static inline void *folio_change_private(struct folio *folio, void *data)  in folio_change_private()  argument
461 	folio->private = data;  in folio_change_private()
466  * folio_detach_private - Detach private data from a folio.
467  * @folio: Folio to detach data from.
469  * Removes the data that was previously attached to the folio and decrements
472  * Return: Data that was attached to the folio.
476 	void *data = folio_get_private(folio);  in folio_detach_private()  local
481 	folio->private = NULL;  in folio_detach_private()
484 	return data;  in folio_detach_private()
487 static inline void attach_page_private(struct page *page, void *data)  in attach_page_private()  argument
489 	folio_attach_private(page_folio(page), data);  in attach_page_private()
521 	return &filemap_alloc_folio(gfp, 0)->page;  in __page_cache_alloc()
536 pgoff_t page_cache_next_miss(struct address_space *mapping,
538 pgoff_t page_cache_prev_miss(struct address_space *mapping,
542  * typedef fgf_t - Flags for getting folios from the page cache.
550  * * %FGP_ACCESSED - The folio will be marked accessed.
551  * * %FGP_LOCK - The folio is returned locked.
552  * * %FGP_CREAT - If no folio is present then a new folio is allocated,
555  * * %FGP_FOR_MMAP - The caller wants to do its own locking dance if the
558  * * %FGP_WRITE - The folio will be written to by the caller.
559  * * %FGP_NOFS - __GFP_FS will get cleared in gfp.
560  * * %FGP_NOWAIT - Don't block on the folio lock.
561  * * %FGP_STABLE - Wait for the folio to be stable (finished writeback)
562  * * %FGP_WRITEBEGIN - The flags to use in a filesystem write_begin()
580  * fgf_set_order - Encode a length in the fgf_t flags.
596 	return (__force fgf_t)((shift - PAGE_SHIFT) << 26);  in fgf_set_order()
599 void *filemap_get_entry(struct address_space *mapping, pgoff_t index);
600 struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index,
602 struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index,
606  * filemap_get_folio - Find and get a folio.
607  * @mapping: The address_space to search.
610  * Looks up the page cache entry at @mapping & @index.  If a folio is
613  * Return: A folio or ERR_PTR(-ENOENT) if there is no folio in the cache for
616 static inline struct folio *filemap_get_folio(struct address_space *mapping,  in filemap_get_folio()  argument
619 	return __filemap_get_folio(mapping, index, 0, 0);  in filemap_get_folio()
623  * filemap_lock_folio - Find and lock a folio.
624  * @mapping: The address_space to search.
627  * Looks up the page cache entry at @mapping & @index.  If a folio is
631  * Return: A folio or ERR_PTR(-ENOENT) if there is no folio in the cache for
634 static inline struct folio *filemap_lock_folio(struct address_space *mapping,  in filemap_lock_folio()  argument
637 	return __filemap_get_folio(mapping, index, FGP_LOCK, 0);  in filemap_lock_folio()
641  * filemap_grab_folio - grab a folio from the page cache
642  * @mapping: The address space to search
645  * Looks up the page cache entry at @mapping & @index. If no folio is found,
649  * Return: A found or created folio. ERR_PTR(-ENOMEM) if no folio is found
652 static inline struct folio *filemap_grab_folio(struct address_space *mapping,  in filemap_grab_folio()  argument
655 	return __filemap_get_folio(mapping, index,  in filemap_grab_folio()
657 			mapping_gfp_mask(mapping));  in filemap_grab_folio()
661  * find_get_page - find and get a page reference
662  * @mapping: the address_space to search
665  * Looks up the page cache slot at @mapping & @offset.  If there is a
670 static inline struct page *find_get_page(struct address_space *mapping,  in find_get_page()  argument
673 	return pagecache_get_page(mapping, offset, 0, 0);  in find_get_page()
676 static inline struct page *find_get_page_flags(struct address_space *mapping,  in find_get_page_flags()  argument
679 	return pagecache_get_page(mapping, offset, fgp_flags, 0);  in find_get_page_flags()
683  * find_lock_page - locate, pin and lock a pagecache page
684  * @mapping: the address_space to search
687  * Looks up the page cache entry at @mapping & @index.  If there is a
695 static inline struct page *find_lock_page(struct address_space *mapping,  in find_lock_page()  argument
698 	return pagecache_get_page(mapping, index, FGP_LOCK, 0);  in find_lock_page()
702  * find_or_create_page - locate or add a pagecache page
703  * @mapping: the page's address_space
704  * @index: the page's index into the mapping
707  * Looks up the page cache slot at @mapping & @offset.  If there is a
720 static inline struct page *find_or_create_page(struct address_space *mapping,  in find_or_create_page()  argument
723 	return pagecache_get_page(mapping, index,  in find_or_create_page()
729  * grab_cache_page_nowait - returns locked page at given index in given cache
730  * @mapping: target address_space
734  * This is intended for speculative data generators, where the data can
741 static inline struct page *grab_cache_page_nowait(struct address_space *mapping,  in grab_cache_page_nowait()  argument
744 	return pagecache_get_page(mapping, index,  in grab_cache_page_nowait()
746 			mapping_gfp_mask(mapping));  in grab_cache_page_nowait()
749 #define swapcache_index(folio)	__page_file_index(&(folio)->page)
752  * folio_index - File index of a folio.
766         return folio->index;  in folio_index()
770  * folio_next_index - Get the index of the next folio.
777 	return folio->index + folio_nr_pages(folio);  in folio_next_index()
781  * folio_file_page - The page for a particular index.
788  * Return: The page containing the file data for this index.
794 		return &folio->page;  in folio_file_page()
795 	return folio_page(folio, index & (folio_nr_pages(folio) - 1));  in folio_file_page()
799  * folio_contains - Does this folio contain this index?
812 		return folio->index == index;  in folio_contains()
813 	return index - folio_index(folio) < folio_nr_pages(folio);  in folio_contains()
826 	return head + (index & (thp_nr_pages(head) - 1));  in find_subpage()
829 unsigned filemap_get_folios(struct address_space *mapping, pgoff_t *start,
831 unsigned filemap_get_folios_contig(struct address_space *mapping,
833 unsigned filemap_get_folios_tag(struct address_space *mapping, pgoff_t *start,
836 struct page *grab_cache_page_write_begin(struct address_space *mapping,
842 static inline struct page *grab_cache_page(struct address_space *mapping,  in grab_cache_page()  argument
845 	return find_or_create_page(mapping, index, mapping_gfp_mask(mapping));  in grab_cache_page()
854 extern struct page * read_cache_page_gfp(struct address_space *mapping,
857 static inline struct page *read_mapping_page(struct address_space *mapping,  in read_mapping_page()  argument
860 	return read_cache_page(mapping, index, NULL, file);  in read_mapping_page()
863 static inline struct folio *read_mapping_folio(struct address_space *mapping,  in read_mapping_folio()  argument
866 	return read_cache_folio(mapping, index, NULL, file);  in read_mapping_folio()
870  * Get index of the page within radix-tree (but not for hugetlb pages).
871  * (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE)
878 		return page->index;  in page_to_index()
882 	 *  We don't initialize ->index for tail pages: calculate based on  in page_to_index()
885 	return head->index + page - head;  in page_to_index()
892  * (TODO: hugetlb pages should have ->index in PAGE_SIZE)
902  * Return byte-offset into filesystem object for page.
906 	return ((loff_t)page->index) << PAGE_SHIFT;  in page_offset()
915  * folio_pos - Returns the byte position of this folio in its file.
920 	return page_offset(&folio->page);  in folio_pos()
924  * folio_file_pos - Returns the byte position of this folio in its file.
932 	return page_file_offset(&folio->page);  in folio_file_pos()
937  * (TODO: hugetlb folios should have ->index in PAGE_SIZE)
942 		return hugetlb_basepage_index(&folio->page);  in folio_pgoff()
943 	return folio->index;  in folio_pgoff()
955 	pgoff = (address - vma->vm_start) >> PAGE_SHIFT;  in linear_page_index()
956 	pgoff += vma->vm_pgoff;  in linear_page_index()
975 	if (wait_page->folio != key->folio)  in wake_page_match()
977 	key->page_match = 1;  in wake_page_match()
979 	if (wait_page->bit_nr != key->bit_nr)  in wake_page_match()
992  * folio_trylock() - Attempt to lock a folio.
1017  * folio_lock() - Lock this folio.
1024  * is sufficient to keep folio->mapping stable.
1028  * cross a page boundary).  Other modifications to the data in the folio
1046  * lock_page() - Lock the folio containing this page.
1067  * folio_lock_killable() - Lock this folio, interruptible by a fatal signal.
1074  * Return: 0 if the lock was acquired; -EINTR if a fatal signal was received.
1085  * folio_lock_or_retry - Lock the folio, unless this would block and the
1141 		struct address_space *mapping, int warn)  in __set_page_dirty()  argument
1143 	__folio_mark_dirty(page_folio(page), mapping, warn);  in __set_page_dirty()
1157 bool noop_dirty_folio(struct address_space *mapping, struct folio *folio);
1160 int filemap_migrate_folio(struct address_space *mapping, struct folio *dst,
1182 int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
1184 int filemap_add_folio(struct address_space *mapping, struct folio *folio,
1189 void delete_from_page_cache_batch(struct address_space *mapping,
1195 /* Must be non-static for BPF error injection */
1196 int __filemap_add_folio(struct address_space *mapping, struct folio *folio,
1199 bool filemap_range_has_writeback(struct address_space *mapping,
1203  * filemap_range_needs_writeback - check if range potentially needs writeback
1204  * @mapping:           address space within which to check
1216 static inline bool filemap_range_needs_writeback(struct address_space *mapping,  in filemap_range_needs_writeback()  argument
1220 	if (!mapping->nrpages)  in filemap_range_needs_writeback()
1222 	if (!mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) &&  in filemap_range_needs_writeback()
1223 	    !mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK))  in filemap_range_needs_writeback()
1225 	return filemap_range_has_writeback(mapping, start_byte, end_byte);  in filemap_range_needs_writeback()
1229  * struct readahead_control - Describes a readahead request.
1232  * implement the ->readahead method should call readahead_page() or
1241  * @mapping: Readahead this filesystem object.
1246 	struct address_space *mapping;  member
1259 		.mapping = m,						\
1275  * page_cache_sync_readahead - generic file readahead
1276  * @mapping: address_space which holds the pagecache and I/O vectors
1288 void page_cache_sync_readahead(struct address_space *mapping,  in page_cache_sync_readahead()  argument
1292 	DEFINE_READAHEAD(ractl, file, ra, mapping, index);  in page_cache_sync_readahead()
1297  * page_cache_async_readahead - file readahead for marked pages
1298  * @mapping: address_space which holds the pagecache and I/O vectors
1311 void page_cache_async_readahead(struct address_space *mapping,  in page_cache_async_readahead()  argument
1315 	DEFINE_READAHEAD(ractl, file, ra, mapping, index);  in page_cache_async_readahead()
1323 	BUG_ON(ractl->_batch_count > ractl->_nr_pages);  in __readahead_folio()
1324 	ractl->_nr_pages -= ractl->_batch_count;  in __readahead_folio()
1325 	ractl->_index += ractl->_batch_count;  in __readahead_folio()
1327 	if (!ractl->_nr_pages) {  in __readahead_folio()
1328 		ractl->_batch_count = 0;  in __readahead_folio()
1332 	folio = xa_load(&ractl->mapping->i_pages, ractl->_index);  in __readahead_folio()
1334 	ractl->_batch_count = folio_nr_pages(folio);  in __readahead_folio()
1340  * readahead_page - Get the next page to read.
1352 	return &folio->page;  in readahead_page()
1356  * readahead_folio - Get the next folio to read.
1376 	XA_STATE(xas, &rac->mapping->i_pages, 0);  in __readahead_batch()
1379 	BUG_ON(rac->_batch_count > rac->_nr_pages);  in __readahead_batch()
1380 	rac->_nr_pages -= rac->_batch_count;  in __readahead_batch()
1381 	rac->_index += rac->_batch_count;  in __readahead_batch()
1382 	rac->_batch_count = 0;  in __readahead_batch()
1384 	xas_set(&xas, rac->_index);  in __readahead_batch()
1386 	xas_for_each(&xas, page, rac->_index + rac->_nr_pages - 1) {  in __readahead_batch()
1392 		rac->_batch_count += thp_nr_pages(page);  in __readahead_batch()
1402  * readahead_page_batch - Get a batch of pages to read.
1416  * readahead_pos - The byte offset into the file of this readahead request.
1421 	return (loff_t)rac->_index * PAGE_SIZE;  in readahead_pos()
1425  * readahead_length - The number of bytes in this readahead request.
1430 	return rac->_nr_pages * PAGE_SIZE;  in readahead_length()
1434  * readahead_index - The index of the first page in this readahead request.
1439 	return rac->_index;  in readahead_index()
1443  * readahead_count - The number of pages in this readahead request.
1448 	return rac->_nr_pages;  in readahead_count()
1452  * readahead_batch_length - The number of bytes in the current batch.
1457 	return rac->_batch_count * PAGE_SIZE;  in readahead_batch_length()
1462 	return (unsigned long)(inode->i_size + PAGE_SIZE - 1) >>  in dir_pages()
1467  * folio_mkwrite_check_truncate - check if folio was truncated
1472  * or -EFAULT if the folio was truncated.
1481 	if (!folio->mapping)  in folio_mkwrite_check_truncate()
1482 		return -EFAULT;  in folio_mkwrite_check_truncate()
1485 	if (folio_next_index(folio) - 1 < index)  in folio_mkwrite_check_truncate()
1488 	if (folio->index > index || !offset)  in folio_mkwrite_check_truncate()
1489 		return -EFAULT;  in folio_mkwrite_check_truncate()
1495  * page_mkwrite_check_truncate - check if page was truncated
1500  * or -EFAULT if the page was truncated.
1509 	if (page->mapping != inode->i_mapping)  in page_mkwrite_check_truncate()
1510 		return -EFAULT;  in page_mkwrite_check_truncate()
1513 	if (page->index < index)  in page_mkwrite_check_truncate()
1516 	if (page->index > index || !offset)  in page_mkwrite_check_truncate()
1517 		return -EFAULT;  in page_mkwrite_check_truncate()
1523  * i_blocks_per_folio - How many blocks fit in this folio.
1536 	return folio_size(folio) >> inode->i_blkbits;  in i_blocks_per_folio()