From 3e629597b8477efbcc0ad14ee80558a080eebdc3 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Mon, 6 Feb 2023 16:25:19 +0000 Subject: filemap: add mapping_read_folio_gfp() This is like read_cache_page_gfp() except it returns the folio instead of the precise page. Link: https://lkml.kernel.org/r/20230206162520.4029022-1-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Cc: Charan Teja Kalla Cc: David Rientjes Cc: Hugh Dickins Cc: Mark Hemment Cc: Michal Hocko Cc: Pavankumar Kondeti Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/filemap.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'mm') diff --git a/mm/filemap.c b/mm/filemap.c index 992554c18f1f..2ebcf500871d 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3585,6 +3585,30 @@ struct folio *read_cache_folio(struct address_space *mapping, pgoff_t index, } EXPORT_SYMBOL(read_cache_folio); +/** + * mapping_read_folio_gfp - Read into page cache, using specified allocation flags. + * @mapping: The address_space for the folio. + * @index: The index that the allocated folio will contain. + * @gfp: The page allocator flags to use if allocating. + * + * This is the same as "read_cache_folio(mapping, index, NULL, NULL)", but with + * any new memory allocations done using the specified allocation flags. + * + * The most likely error from this function is EIO, but ENOMEM is + * possible and so is EINTR. If ->read_folio returns another error, + * that will be returned to the caller. + * + * The function expects mapping->invalidate_lock to be already held. + * + * Return: Uptodate folio on success, ERR_PTR() on failure. + */ +struct folio *mapping_read_folio_gfp(struct address_space *mapping, + pgoff_t index, gfp_t gfp) +{ + return do_read_cache_folio(mapping, index, NULL, NULL, gfp); +} +EXPORT_SYMBOL(mapping_read_folio_gfp); + static struct page *do_read_cache_page(struct address_space *mapping, pgoff_t index, filler_t *filler, struct file *file, gfp_t gfp) { -- cgit v1.2.3