From 9326c9b20dd813248280cca1e1d1c05e939dae15 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Wed, 26 Jul 2017 10:21:11 -0400 Subject: [PATCH] mm: consolidate dax / non-dax checks for writeback We have this complex conditional copied to several places. Turn it into a helper function. Reviewed-by: Jan Kara Signed-off-by: Jeff Layton --- mm/filemap.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index e1cca770688f..72e46e6f0d9a 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -522,12 +522,17 @@ int filemap_fdatawait(struct address_space *mapping) } EXPORT_SYMBOL(filemap_fdatawait); +static bool mapping_needs_writeback(struct address_space *mapping) +{ + return (!dax_mapping(mapping) && mapping->nrpages) || + (dax_mapping(mapping) && mapping->nrexceptional); +} + int filemap_write_and_wait(struct address_space *mapping) { int err = 0; - if ((!dax_mapping(mapping) && mapping->nrpages) || - (dax_mapping(mapping) && mapping->nrexceptional)) { + if (mapping_needs_writeback(mapping)) { err = filemap_fdatawrite(mapping); /* * Even if the above returned error, the pages may be @@ -566,8 +571,7 @@ int filemap_write_and_wait_range(struct address_space *mapping, { int err = 0; - if ((!dax_mapping(mapping) && mapping->nrpages) || - (dax_mapping(mapping) && mapping->nrexceptional)) { + if (mapping_needs_writeback(mapping)) { err = __filemap_fdatawrite_range(mapping, lstart, lend, WB_SYNC_ALL); /* See comment of filemap_write_and_wait() */ @@ -656,8 +660,7 @@ int file_write_and_wait_range(struct file *file, loff_t lstart, loff_t lend) int err = 0, err2; struct address_space *mapping = file->f_mapping; - if ((!dax_mapping(mapping) && mapping->nrpages) || - (dax_mapping(mapping) && mapping->nrexceptional)) { + if (mapping_needs_writeback(mapping)) { err = __filemap_fdatawrite_range(mapping, lstart, lend, WB_SYNC_ALL); /* See comment of filemap_write_and_wait() */ -- 2.20.1