From 4c4a763406ef903b78334bd2ccea168d2f7a741a Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 9 May 2022 18:20:47 -0700 Subject: mm: drop swap_dirty_folio folios that are written to swap are owned by the MM subsystem - not any filesystem. When such a folio is passed to a filesystem to be written out to a swap-file, the filesystem handles the data, but the folio itself does not belong to the filesystem. So calling the filesystem's ->dirty_folio() address_space operation makes no sense. This is for folios in the given address space, and a folio to be written to swap does not exist in the given address space. So drop swap_dirty_folio() which calls the address-space's ->dirty_folio(), and always use noop_dirty_folio(), which is appropriate for folios being swapped out. Link: https://lkml.kernel.org/r/164859778123.29473.6900942583784889976.stgit@noble.brown Signed-off-by: NeilBrown Reviewed-by: Christoph Hellwig Tested-by: David Howells Tested-by: Geert Uytterhoeven Cc: Hugh Dickins Cc: Mel Gorman Cc: Trond Myklebust Cc: Miaohe Lin Signed-off-by: Andrew Morton --- mm/page_io.c | 17 ----------------- 1 file changed, 17 deletions(-) (limited to 'mm/page_io.c') diff --git a/mm/page_io.c b/mm/page_io.c index 4b359e59bfdc..77fa0fb263f4 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -385,20 +385,3 @@ out: delayacct_swapin_end(); return ret; } - -bool swap_dirty_folio(struct address_space *mapping, struct folio *folio) -{ - struct swap_info_struct *sis = swp_swap_info(folio_swap_entry(folio)); - - if (data_race(sis->flags & SWP_FS_OPS)) { - const struct address_space_operations *aops; - - mapping = sis->swap_file->f_mapping; - aops = mapping->a_ops; - - VM_BUG_ON_FOLIO(!folio_test_swapcache(folio), folio); - return aops->dirty_folio(mapping, folio); - } else { - return noop_dirty_folio(mapping, folio); - } -} -- cgit