diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 900ad7818bd4..b303516f2753 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -432,6 +432,10 @@ static bool inode_do_switch_wbs(struct inode *inode, long nr = folio_nr_pages(folio); wb_stat_mod(old_wb, WB_RECLAIMABLE, -nr); wb_stat_mod(new_wb, WB_RECLAIMABLE, nr); + if (folio_test_dropbehind(folio)) { + wb_stat_mod(old_wb, WB_DONTCACHE_DIRTY, -nr); + wb_stat_mod(new_wb, WB_DONTCACHE_DIRTY, nr); + } } } diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h index a06b93446d10..cb660dd37286 100644 --- a/include/linux/backing-dev-defs.h +++ b/include/linux/backing-dev-defs.h @@ -33,6 +33,7 @@ enum wb_stat_item { WB_WRITEBACK, WB_DIRTIED, WB_WRITTEN, + WB_DONTCACHE_DIRTY, NR_WB_STAT_ITEMS }; diff --git a/mm/filemap.c b/mm/filemap.c index 4e636647100c..179f2886f8c0 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2052,8 +2052,19 @@ struct folio *__filemap_get_folio_mpol(struct address_space *mapping, if (!folio) return ERR_PTR(-ENOENT); /* not an uncached lookup, clear uncached if set */ - if (folio_test_dropbehind(folio) && !(fgp_flags & FGP_DONTCACHE)) - folio_clear_dropbehind(folio); + if (!(fgp_flags & FGP_DONTCACHE) && folio_test_clear_dropbehind(folio)) { + if (folio_test_dirty(folio) && + mapping_can_writeback(mapping)) { + struct inode *inode = mapping->host; + struct bdi_writeback *wb; + struct wb_lock_cookie cookie = {}; + long nr = folio_nr_pages(folio); + + wb = unlocked_inode_to_wb_begin(inode, &cookie); + wb_stat_mod(wb, WB_DONTCACHE_DIRTY, -nr); + unlocked_inode_to_wb_end(inode, &cookie); + } + } return folio; } EXPORT_SYMBOL(__filemap_get_folio_mpol); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 88cd53d4ba09..8e520717d1f6 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2630,6 +2630,8 @@ static void folio_account_dirtied(struct folio *folio, wb = inode_to_wb(inode); lruvec_stat_mod_folio(folio, NR_FILE_DIRTY, nr); + if (folio_test_dropbehind(folio)) + wb_stat_mod(wb, WB_DONTCACHE_DIRTY, nr); __zone_stat_mod_folio(folio, NR_ZONE_WRITE_PENDING, nr); __node_stat_mod_folio(folio, NR_DIRTIED, nr); wb_stat_mod(wb, WB_RECLAIMABLE, nr); @@ -2651,6 +2653,8 @@ void folio_account_cleaned(struct folio *folio, struct bdi_writeback *wb) long nr = folio_nr_pages(folio); lruvec_stat_mod_folio(folio, NR_FILE_DIRTY, -nr); + if (folio_test_dropbehind(folio)) + wb_stat_mod(wb, WB_DONTCACHE_DIRTY, -nr); zone_stat_mod_folio(folio, NR_ZONE_WRITE_PENDING, -nr); wb_stat_mod(wb, WB_RECLAIMABLE, -nr); task_io_account_cancelled_write(nr * PAGE_SIZE); @@ -2920,6 +2924,8 @@ bool folio_clear_dirty_for_io(struct folio *folio) if (folio_test_clear_dirty(folio)) { long nr = folio_nr_pages(folio); lruvec_stat_mod_folio(folio, NR_FILE_DIRTY, -nr); + if (folio_test_dropbehind(folio)) + wb_stat_mod(wb, WB_DONTCACHE_DIRTY, -nr); zone_stat_mod_folio(folio, NR_ZONE_WRITE_PENDING, -nr); wb_stat_mod(wb, WB_RECLAIMABLE, -nr); ret = true;